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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_transport.c | |
3 | * | |
4 | * This file contains the Generic Target Engine Core. | |
5 | * | |
6 | * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. | |
7 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. | |
8 | * Copyright (c) 2007-2010 Rising Tide Systems | |
9 | * Copyright (c) 2008-2010 Linux-iSCSI.org | |
10 | * | |
11 | * Nicholas A. Bellinger <nab@kernel.org> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
26 | * | |
27 | ******************************************************************************/ | |
28 | ||
c66ac9db NB |
29 | #include <linux/net.h> |
30 | #include <linux/delay.h> | |
31 | #include <linux/string.h> | |
32 | #include <linux/timer.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/blkdev.h> | |
35 | #include <linux/spinlock.h> | |
c66ac9db NB |
36 | #include <linux/kthread.h> |
37 | #include <linux/in.h> | |
38 | #include <linux/cdrom.h> | |
827509e3 | 39 | #include <linux/module.h> |
c66ac9db NB |
40 | #include <asm/unaligned.h> |
41 | #include <net/sock.h> | |
42 | #include <net/tcp.h> | |
43 | #include <scsi/scsi.h> | |
44 | #include <scsi/scsi_cmnd.h> | |
e66ecd50 | 45 | #include <scsi/scsi_tcq.h> |
c66ac9db NB |
46 | |
47 | #include <target/target_core_base.h> | |
c4795fb2 CH |
48 | #include <target/target_core_backend.h> |
49 | #include <target/target_core_fabric.h> | |
c66ac9db NB |
50 | #include <target/target_core_configfs.h> |
51 | ||
e26d99ae | 52 | #include "target_core_internal.h" |
c66ac9db | 53 | #include "target_core_alua.h" |
c66ac9db | 54 | #include "target_core_pr.h" |
c66ac9db NB |
55 | #include "target_core_ua.h" |
56 | ||
e3d6f909 | 57 | static int sub_api_initialized; |
c66ac9db | 58 | |
35e0e757 | 59 | static struct workqueue_struct *target_completion_wq; |
c66ac9db NB |
60 | static struct kmem_cache *se_sess_cache; |
61 | struct kmem_cache *se_tmr_req_cache; | |
62 | struct kmem_cache *se_ua_cache; | |
c66ac9db NB |
63 | struct kmem_cache *t10_pr_reg_cache; |
64 | struct kmem_cache *t10_alua_lu_gp_cache; | |
65 | struct kmem_cache *t10_alua_lu_gp_mem_cache; | |
66 | struct kmem_cache *t10_alua_tg_pt_gp_cache; | |
67 | struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; | |
68 | ||
c66ac9db | 69 | static int transport_generic_write_pending(struct se_cmd *); |
5951146d | 70 | static int transport_processing_thread(void *param); |
4d2300cc | 71 | static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *); |
c66ac9db | 72 | static void transport_complete_task_attr(struct se_cmd *cmd); |
07bde79a | 73 | static void transport_handle_queue_full(struct se_cmd *cmd, |
e057f533 | 74 | struct se_device *dev); |
c66ac9db | 75 | static void transport_free_dev_tasks(struct se_cmd *cmd); |
05d1c7c0 | 76 | static int transport_generic_get_mem(struct se_cmd *cmd); |
39c05f32 | 77 | static void transport_put_cmd(struct se_cmd *cmd); |
3df8d40b | 78 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd); |
c66ac9db | 79 | static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq); |
03e98c9e | 80 | static void transport_generic_request_failure(struct se_cmd *); |
35e0e757 | 81 | static void target_complete_ok_work(struct work_struct *work); |
c66ac9db | 82 | |
e3d6f909 | 83 | int init_se_kmem_caches(void) |
c66ac9db | 84 | { |
c66ac9db NB |
85 | se_tmr_req_cache = kmem_cache_create("se_tmr_cache", |
86 | sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req), | |
87 | 0, NULL); | |
6708bb27 AG |
88 | if (!se_tmr_req_cache) { |
89 | pr_err("kmem_cache_create() for struct se_tmr_req" | |
c66ac9db | 90 | " failed\n"); |
97c34f3b | 91 | goto out; |
c66ac9db NB |
92 | } |
93 | se_sess_cache = kmem_cache_create("se_sess_cache", | |
94 | sizeof(struct se_session), __alignof__(struct se_session), | |
95 | 0, NULL); | |
6708bb27 AG |
96 | if (!se_sess_cache) { |
97 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db | 98 | " failed\n"); |
35e0e757 | 99 | goto out_free_tmr_req_cache; |
c66ac9db NB |
100 | } |
101 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
102 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
103 | 0, NULL); | |
6708bb27 AG |
104 | if (!se_ua_cache) { |
105 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
35e0e757 | 106 | goto out_free_sess_cache; |
c66ac9db | 107 | } |
c66ac9db NB |
108 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
109 | sizeof(struct t10_pr_registration), | |
110 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
111 | if (!t10_pr_reg_cache) { |
112 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db | 113 | " failed\n"); |
35e0e757 | 114 | goto out_free_ua_cache; |
c66ac9db NB |
115 | } |
116 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
117 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
118 | 0, NULL); | |
6708bb27 AG |
119 | if (!t10_alua_lu_gp_cache) { |
120 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db | 121 | " failed\n"); |
35e0e757 | 122 | goto out_free_pr_reg_cache; |
c66ac9db NB |
123 | } |
124 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
125 | sizeof(struct t10_alua_lu_gp_member), | |
126 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
127 | if (!t10_alua_lu_gp_mem_cache) { |
128 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db | 129 | "cache failed\n"); |
35e0e757 | 130 | goto out_free_lu_gp_cache; |
c66ac9db NB |
131 | } |
132 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
133 | sizeof(struct t10_alua_tg_pt_gp), | |
134 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
135 | if (!t10_alua_tg_pt_gp_cache) { |
136 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 137 | "cache failed\n"); |
35e0e757 | 138 | goto out_free_lu_gp_mem_cache; |
c66ac9db NB |
139 | } |
140 | t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( | |
141 | "t10_alua_tg_pt_gp_mem_cache", | |
142 | sizeof(struct t10_alua_tg_pt_gp_member), | |
143 | __alignof__(struct t10_alua_tg_pt_gp_member), | |
144 | 0, NULL); | |
6708bb27 AG |
145 | if (!t10_alua_tg_pt_gp_mem_cache) { |
146 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 147 | "mem_t failed\n"); |
35e0e757 | 148 | goto out_free_tg_pt_gp_cache; |
c66ac9db NB |
149 | } |
150 | ||
35e0e757 CH |
151 | target_completion_wq = alloc_workqueue("target_completion", |
152 | WQ_MEM_RECLAIM, 0); | |
153 | if (!target_completion_wq) | |
154 | goto out_free_tg_pt_gp_mem_cache; | |
155 | ||
c66ac9db | 156 | return 0; |
35e0e757 CH |
157 | |
158 | out_free_tg_pt_gp_mem_cache: | |
159 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
160 | out_free_tg_pt_gp_cache: | |
161 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
162 | out_free_lu_gp_mem_cache: | |
163 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
164 | out_free_lu_gp_cache: | |
165 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
166 | out_free_pr_reg_cache: | |
167 | kmem_cache_destroy(t10_pr_reg_cache); | |
168 | out_free_ua_cache: | |
169 | kmem_cache_destroy(se_ua_cache); | |
170 | out_free_sess_cache: | |
171 | kmem_cache_destroy(se_sess_cache); | |
172 | out_free_tmr_req_cache: | |
173 | kmem_cache_destroy(se_tmr_req_cache); | |
c66ac9db | 174 | out: |
e3d6f909 | 175 | return -ENOMEM; |
c66ac9db NB |
176 | } |
177 | ||
e3d6f909 | 178 | void release_se_kmem_caches(void) |
c66ac9db | 179 | { |
35e0e757 | 180 | destroy_workqueue(target_completion_wq); |
c66ac9db NB |
181 | kmem_cache_destroy(se_tmr_req_cache); |
182 | kmem_cache_destroy(se_sess_cache); | |
183 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
184 | kmem_cache_destroy(t10_pr_reg_cache); |
185 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
186 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
187 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
188 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
c66ac9db NB |
189 | } |
190 | ||
e3d6f909 AG |
191 | /* This code ensures unique mib indexes are handed out. */ |
192 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
193 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
194 | |
195 | /* | |
196 | * Allocate a new row index for the entry type specified | |
197 | */ | |
198 | u32 scsi_get_new_index(scsi_index_t type) | |
199 | { | |
200 | u32 new_index; | |
201 | ||
e3d6f909 | 202 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 203 | |
e3d6f909 AG |
204 | spin_lock(&scsi_mib_index_lock); |
205 | new_index = ++scsi_mib_index[type]; | |
206 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
207 | |
208 | return new_index; | |
209 | } | |
210 | ||
e26d99ae | 211 | static void transport_init_queue_obj(struct se_queue_obj *qobj) |
c66ac9db NB |
212 | { |
213 | atomic_set(&qobj->queue_cnt, 0); | |
214 | INIT_LIST_HEAD(&qobj->qobj_list); | |
215 | init_waitqueue_head(&qobj->thread_wq); | |
216 | spin_lock_init(&qobj->cmd_queue_lock); | |
217 | } | |
c66ac9db | 218 | |
dbc5623e | 219 | void transport_subsystem_check_init(void) |
c66ac9db NB |
220 | { |
221 | int ret; | |
222 | ||
dbc5623e NB |
223 | if (sub_api_initialized) |
224 | return; | |
225 | ||
c66ac9db NB |
226 | ret = request_module("target_core_iblock"); |
227 | if (ret != 0) | |
6708bb27 | 228 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
229 | |
230 | ret = request_module("target_core_file"); | |
231 | if (ret != 0) | |
6708bb27 | 232 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
233 | |
234 | ret = request_module("target_core_pscsi"); | |
235 | if (ret != 0) | |
6708bb27 | 236 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db NB |
237 | |
238 | ret = request_module("target_core_stgt"); | |
239 | if (ret != 0) | |
6708bb27 | 240 | pr_err("Unable to load target_core_stgt\n"); |
c66ac9db | 241 | |
e3d6f909 | 242 | sub_api_initialized = 1; |
dbc5623e | 243 | return; |
c66ac9db NB |
244 | } |
245 | ||
246 | struct se_session *transport_init_session(void) | |
247 | { | |
248 | struct se_session *se_sess; | |
249 | ||
250 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
251 | if (!se_sess) { |
252 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
253 | " se_sess_cache\n"); |
254 | return ERR_PTR(-ENOMEM); | |
255 | } | |
256 | INIT_LIST_HEAD(&se_sess->sess_list); | |
257 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
a17f091d NB |
258 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
259 | INIT_LIST_HEAD(&se_sess->sess_wait_list); | |
260 | spin_lock_init(&se_sess->sess_cmd_lock); | |
c66ac9db NB |
261 | |
262 | return se_sess; | |
263 | } | |
264 | EXPORT_SYMBOL(transport_init_session); | |
265 | ||
266 | /* | |
267 | * Called with spin_lock_bh(&struct se_portal_group->session_lock called. | |
268 | */ | |
269 | void __transport_register_session( | |
270 | struct se_portal_group *se_tpg, | |
271 | struct se_node_acl *se_nacl, | |
272 | struct se_session *se_sess, | |
273 | void *fabric_sess_ptr) | |
274 | { | |
275 | unsigned char buf[PR_REG_ISID_LEN]; | |
276 | ||
277 | se_sess->se_tpg = se_tpg; | |
278 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
279 | /* | |
280 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
281 | * | |
282 | * Only set for struct se_session's that will actually be moving I/O. | |
283 | * eg: *NOT* discovery sessions. | |
284 | */ | |
285 | if (se_nacl) { | |
286 | /* | |
287 | * If the fabric module supports an ISID based TransportID, | |
288 | * save this value in binary from the fabric I_T Nexus now. | |
289 | */ | |
e3d6f909 | 290 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 291 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 292 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
293 | &buf[0], PR_REG_ISID_LEN); |
294 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
295 | } | |
296 | spin_lock_irq(&se_nacl->nacl_sess_lock); | |
297 | /* | |
298 | * The se_nacl->nacl_sess pointer will be set to the | |
299 | * last active I_T Nexus for each struct se_node_acl. | |
300 | */ | |
301 | se_nacl->nacl_sess = se_sess; | |
302 | ||
303 | list_add_tail(&se_sess->sess_acl_list, | |
304 | &se_nacl->acl_sess_list); | |
305 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
306 | } | |
307 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
308 | ||
6708bb27 | 309 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 310 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
311 | } |
312 | EXPORT_SYMBOL(__transport_register_session); | |
313 | ||
314 | void transport_register_session( | |
315 | struct se_portal_group *se_tpg, | |
316 | struct se_node_acl *se_nacl, | |
317 | struct se_session *se_sess, | |
318 | void *fabric_sess_ptr) | |
319 | { | |
320 | spin_lock_bh(&se_tpg->session_lock); | |
321 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); | |
322 | spin_unlock_bh(&se_tpg->session_lock); | |
323 | } | |
324 | EXPORT_SYMBOL(transport_register_session); | |
325 | ||
326 | void transport_deregister_session_configfs(struct se_session *se_sess) | |
327 | { | |
328 | struct se_node_acl *se_nacl; | |
23388864 | 329 | unsigned long flags; |
c66ac9db NB |
330 | /* |
331 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
332 | */ | |
333 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 334 | if (se_nacl) { |
23388864 | 335 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
336 | list_del(&se_sess->sess_acl_list); |
337 | /* | |
338 | * If the session list is empty, then clear the pointer. | |
339 | * Otherwise, set the struct se_session pointer from the tail | |
340 | * element of the per struct se_node_acl active session list. | |
341 | */ | |
342 | if (list_empty(&se_nacl->acl_sess_list)) | |
343 | se_nacl->nacl_sess = NULL; | |
344 | else { | |
345 | se_nacl->nacl_sess = container_of( | |
346 | se_nacl->acl_sess_list.prev, | |
347 | struct se_session, sess_acl_list); | |
348 | } | |
23388864 | 349 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
350 | } |
351 | } | |
352 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
353 | ||
354 | void transport_free_session(struct se_session *se_sess) | |
355 | { | |
356 | kmem_cache_free(se_sess_cache, se_sess); | |
357 | } | |
358 | EXPORT_SYMBOL(transport_free_session); | |
359 | ||
360 | void transport_deregister_session(struct se_session *se_sess) | |
361 | { | |
362 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
363 | struct se_node_acl *se_nacl; | |
e63a8e19 | 364 | unsigned long flags; |
c66ac9db | 365 | |
6708bb27 | 366 | if (!se_tpg) { |
c66ac9db NB |
367 | transport_free_session(se_sess); |
368 | return; | |
369 | } | |
c66ac9db | 370 | |
e63a8e19 | 371 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
372 | list_del(&se_sess->sess_list); |
373 | se_sess->se_tpg = NULL; | |
374 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 375 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
376 | |
377 | /* | |
378 | * Determine if we need to do extra work for this initiator node's | |
379 | * struct se_node_acl if it had been previously dynamically generated. | |
380 | */ | |
381 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 382 | if (se_nacl) { |
e63a8e19 | 383 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db | 384 | if (se_nacl->dynamic_node_acl) { |
6708bb27 AG |
385 | if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache( |
386 | se_tpg)) { | |
c66ac9db NB |
387 | list_del(&se_nacl->acl_list); |
388 | se_tpg->num_node_acls--; | |
e63a8e19 | 389 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
390 | |
391 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
c66ac9db | 392 | core_free_device_list_for_node(se_nacl, se_tpg); |
e3d6f909 | 393 | se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, |
c66ac9db | 394 | se_nacl); |
e63a8e19 | 395 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
396 | } |
397 | } | |
e63a8e19 | 398 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
399 | } |
400 | ||
401 | transport_free_session(se_sess); | |
402 | ||
6708bb27 | 403 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 404 | se_tpg->se_tpg_tfo->get_fabric_name()); |
c66ac9db NB |
405 | } |
406 | EXPORT_SYMBOL(transport_deregister_session); | |
407 | ||
408 | /* | |
a1d8b49a | 409 | * Called with cmd->t_state_lock held. |
c66ac9db NB |
410 | */ |
411 | static void transport_all_task_dev_remove_state(struct se_cmd *cmd) | |
412 | { | |
42bf829e | 413 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
414 | struct se_task *task; |
415 | unsigned long flags; | |
416 | ||
42bf829e CH |
417 | if (!dev) |
418 | return; | |
c66ac9db | 419 | |
42bf829e | 420 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
6c76bf95 | 421 | if (task->task_flags & TF_ACTIVE) |
c66ac9db NB |
422 | continue; |
423 | ||
c66ac9db | 424 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
1880807a CH |
425 | if (task->t_state_active) { |
426 | pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n", | |
427 | cmd->se_tfo->get_task_tag(cmd), dev, task); | |
c66ac9db | 428 | |
1880807a CH |
429 | list_del(&task->t_state_list); |
430 | atomic_dec(&cmd->t_task_cdbs_ex_left); | |
431 | task->t_state_active = false; | |
432 | } | |
433 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
c66ac9db | 434 | } |
1880807a | 435 | |
c66ac9db NB |
436 | } |
437 | ||
438 | /* transport_cmd_check_stop(): | |
439 | * | |
440 | * 'transport_off = 1' determines if t_transport_active should be cleared. | |
441 | * 'transport_off = 2' determines if task_dev_state should be removed. | |
442 | * | |
443 | * A non-zero u8 t_state sets cmd->t_state. | |
444 | * Returns 1 when command is stopped, else 0. | |
445 | */ | |
446 | static int transport_cmd_check_stop( | |
447 | struct se_cmd *cmd, | |
448 | int transport_off, | |
449 | u8 t_state) | |
450 | { | |
451 | unsigned long flags; | |
452 | ||
a1d8b49a | 453 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
454 | /* |
455 | * Determine if IOCTL context caller in requesting the stopping of this | |
456 | * command for LUN shutdown purposes. | |
457 | */ | |
a1d8b49a | 458 | if (atomic_read(&cmd->transport_lun_stop)) { |
6708bb27 | 459 | pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)" |
c66ac9db | 460 | " == TRUE for ITT: 0x%08x\n", __func__, __LINE__, |
e3d6f909 | 461 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 462 | |
a1d8b49a | 463 | atomic_set(&cmd->t_transport_active, 0); |
c66ac9db NB |
464 | if (transport_off == 2) |
465 | transport_all_task_dev_remove_state(cmd); | |
a1d8b49a | 466 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 467 | |
a1d8b49a | 468 | complete(&cmd->transport_lun_stop_comp); |
c66ac9db NB |
469 | return 1; |
470 | } | |
471 | /* | |
472 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 473 | * this command for frontend exceptions. |
c66ac9db | 474 | */ |
a1d8b49a | 475 | if (atomic_read(&cmd->t_transport_stop)) { |
6708bb27 | 476 | pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) ==" |
c66ac9db | 477 | " TRUE for ITT: 0x%08x\n", __func__, __LINE__, |
e3d6f909 | 478 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 479 | |
c66ac9db NB |
480 | if (transport_off == 2) |
481 | transport_all_task_dev_remove_state(cmd); | |
482 | ||
483 | /* | |
484 | * Clear struct se_cmd->se_lun before the transport_off == 2 handoff | |
485 | * to FE. | |
486 | */ | |
487 | if (transport_off == 2) | |
488 | cmd->se_lun = NULL; | |
a1d8b49a | 489 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 490 | |
a1d8b49a | 491 | complete(&cmd->t_transport_stop_comp); |
c66ac9db NB |
492 | return 1; |
493 | } | |
494 | if (transport_off) { | |
a1d8b49a | 495 | atomic_set(&cmd->t_transport_active, 0); |
c66ac9db NB |
496 | if (transport_off == 2) { |
497 | transport_all_task_dev_remove_state(cmd); | |
498 | /* | |
499 | * Clear struct se_cmd->se_lun before the transport_off == 2 | |
500 | * handoff to fabric module. | |
501 | */ | |
502 | cmd->se_lun = NULL; | |
503 | /* | |
504 | * Some fabric modules like tcm_loop can release | |
25985edc | 505 | * their internally allocated I/O reference now and |
c66ac9db | 506 | * struct se_cmd now. |
88dd9e26 NB |
507 | * |
508 | * Fabric modules are expected to return '1' here if the | |
509 | * se_cmd being passed is released at this point, | |
510 | * or zero if not being released. | |
c66ac9db | 511 | */ |
e3d6f909 | 512 | if (cmd->se_tfo->check_stop_free != NULL) { |
c66ac9db | 513 | spin_unlock_irqrestore( |
a1d8b49a | 514 | &cmd->t_state_lock, flags); |
c66ac9db | 515 | |
88dd9e26 | 516 | return cmd->se_tfo->check_stop_free(cmd); |
c66ac9db NB |
517 | } |
518 | } | |
a1d8b49a | 519 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
520 | |
521 | return 0; | |
522 | } else if (t_state) | |
523 | cmd->t_state = t_state; | |
a1d8b49a | 524 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
525 | |
526 | return 0; | |
527 | } | |
528 | ||
529 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
530 | { | |
531 | return transport_cmd_check_stop(cmd, 2, 0); | |
532 | } | |
533 | ||
534 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
535 | { | |
e3d6f909 | 536 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
537 | unsigned long flags; |
538 | ||
539 | if (!lun) | |
540 | return; | |
541 | ||
a1d8b49a | 542 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6708bb27 | 543 | if (!atomic_read(&cmd->transport_dev_active)) { |
a1d8b49a | 544 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
545 | goto check_lun; |
546 | } | |
a1d8b49a | 547 | atomic_set(&cmd->transport_dev_active, 0); |
c66ac9db | 548 | transport_all_task_dev_remove_state(cmd); |
a1d8b49a | 549 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 550 | |
c66ac9db NB |
551 | |
552 | check_lun: | |
553 | spin_lock_irqsave(&lun->lun_cmd_lock, flags); | |
a1d8b49a | 554 | if (atomic_read(&cmd->transport_lun_active)) { |
5951146d | 555 | list_del(&cmd->se_lun_node); |
a1d8b49a | 556 | atomic_set(&cmd->transport_lun_active, 0); |
c66ac9db | 557 | #if 0 |
6708bb27 | 558 | pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n" |
e3d6f909 | 559 | cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun); |
c66ac9db NB |
560 | #endif |
561 | } | |
562 | spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); | |
563 | } | |
564 | ||
565 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
566 | { | |
8dc52b54 NB |
567 | if (!cmd->se_tmr_req) |
568 | transport_lun_remove_cmd(cmd); | |
c66ac9db NB |
569 | |
570 | if (transport_cmd_check_stop_to_fabric(cmd)) | |
571 | return; | |
77039d1e | 572 | if (remove) { |
3df8d40b | 573 | transport_remove_cmd_from_queue(cmd); |
e6a2573f | 574 | transport_put_cmd(cmd); |
77039d1e | 575 | } |
c66ac9db NB |
576 | } |
577 | ||
f7a5cc0b CH |
578 | static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state, |
579 | bool at_head) | |
c66ac9db NB |
580 | { |
581 | struct se_device *dev = cmd->se_dev; | |
e3d6f909 | 582 | struct se_queue_obj *qobj = &dev->dev_queue_obj; |
c66ac9db NB |
583 | unsigned long flags; |
584 | ||
c66ac9db | 585 | if (t_state) { |
a1d8b49a | 586 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 587 | cmd->t_state = t_state; |
a1d8b49a AG |
588 | atomic_set(&cmd->t_transport_active, 1); |
589 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
590 | } |
591 | ||
592 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
79a7fef2 RD |
593 | |
594 | /* If the cmd is already on the list, remove it before we add it */ | |
595 | if (!list_empty(&cmd->se_queue_node)) | |
596 | list_del(&cmd->se_queue_node); | |
597 | else | |
598 | atomic_inc(&qobj->queue_cnt); | |
599 | ||
f7a5cc0b | 600 | if (at_head) |
07bde79a | 601 | list_add(&cmd->se_queue_node, &qobj->qobj_list); |
f7a5cc0b | 602 | else |
07bde79a | 603 | list_add_tail(&cmd->se_queue_node, &qobj->qobj_list); |
79a7fef2 | 604 | atomic_set(&cmd->t_transport_queue_active, 1); |
c66ac9db NB |
605 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
606 | ||
c66ac9db | 607 | wake_up_interruptible(&qobj->thread_wq); |
c66ac9db NB |
608 | } |
609 | ||
5951146d AG |
610 | static struct se_cmd * |
611 | transport_get_cmd_from_queue(struct se_queue_obj *qobj) | |
c66ac9db | 612 | { |
5951146d | 613 | struct se_cmd *cmd; |
c66ac9db NB |
614 | unsigned long flags; |
615 | ||
616 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
617 | if (list_empty(&qobj->qobj_list)) { | |
618 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
619 | return NULL; | |
620 | } | |
5951146d | 621 | cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node); |
c66ac9db | 622 | |
79a7fef2 | 623 | atomic_set(&cmd->t_transport_queue_active, 0); |
c66ac9db | 624 | |
79a7fef2 | 625 | list_del_init(&cmd->se_queue_node); |
c66ac9db NB |
626 | atomic_dec(&qobj->queue_cnt); |
627 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
628 | ||
5951146d | 629 | return cmd; |
c66ac9db NB |
630 | } |
631 | ||
3df8d40b | 632 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd) |
c66ac9db | 633 | { |
3df8d40b | 634 | struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj; |
c66ac9db NB |
635 | unsigned long flags; |
636 | ||
637 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
6708bb27 | 638 | if (!atomic_read(&cmd->t_transport_queue_active)) { |
c66ac9db NB |
639 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
640 | return; | |
641 | } | |
79a7fef2 RD |
642 | atomic_set(&cmd->t_transport_queue_active, 0); |
643 | atomic_dec(&qobj->queue_cnt); | |
644 | list_del_init(&cmd->se_queue_node); | |
c66ac9db NB |
645 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
646 | ||
a1d8b49a | 647 | if (atomic_read(&cmd->t_transport_queue_active)) { |
6708bb27 | 648 | pr_err("ITT: 0x%08x t_transport_queue_active: %d\n", |
e3d6f909 | 649 | cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 650 | atomic_read(&cmd->t_transport_queue_active)); |
c66ac9db NB |
651 | } |
652 | } | |
653 | ||
654 | /* | |
655 | * Completion function used by TCM subsystem plugins (such as FILEIO) | |
656 | * for queueing up response from struct se_subsystem_api->do_task() | |
657 | */ | |
658 | void transport_complete_sync_cache(struct se_cmd *cmd, int good) | |
659 | { | |
a1d8b49a | 660 | struct se_task *task = list_entry(cmd->t_task_list.next, |
c66ac9db NB |
661 | struct se_task, t_list); |
662 | ||
663 | if (good) { | |
664 | cmd->scsi_status = SAM_STAT_GOOD; | |
665 | task->task_scsi_status = GOOD; | |
666 | } else { | |
667 | task->task_scsi_status = SAM_STAT_CHECK_CONDITION; | |
03e98c9e NB |
668 | task->task_se_cmd->scsi_sense_reason = |
669 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
670 | ||
c66ac9db NB |
671 | } |
672 | ||
673 | transport_complete_task(task, good); | |
674 | } | |
675 | EXPORT_SYMBOL(transport_complete_sync_cache); | |
676 | ||
35e0e757 CH |
677 | static void target_complete_failure_work(struct work_struct *work) |
678 | { | |
679 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
680 | ||
03e98c9e | 681 | transport_generic_request_failure(cmd); |
35e0e757 CH |
682 | } |
683 | ||
c66ac9db NB |
684 | /* transport_complete_task(): |
685 | * | |
686 | * Called from interrupt and non interrupt context depending | |
687 | * on the transport plugin. | |
688 | */ | |
689 | void transport_complete_task(struct se_task *task, int success) | |
690 | { | |
e3d6f909 | 691 | struct se_cmd *cmd = task->task_se_cmd; |
42bf829e | 692 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 693 | unsigned long flags; |
c66ac9db | 694 | |
a1d8b49a | 695 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 696 | task->task_flags &= ~TF_ACTIVE; |
c66ac9db NB |
697 | |
698 | /* | |
699 | * See if any sense data exists, if so set the TASK_SENSE flag. | |
700 | * Also check for any other post completion work that needs to be | |
701 | * done by the plugins. | |
702 | */ | |
703 | if (dev && dev->transport->transport_complete) { | |
704 | if (dev->transport->transport_complete(task) != 0) { | |
705 | cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; | |
ef804a84 | 706 | task->task_flags |= TF_HAS_SENSE; |
c66ac9db NB |
707 | success = 1; |
708 | } | |
709 | } | |
710 | ||
711 | /* | |
712 | * See if we are waiting for outstanding struct se_task | |
713 | * to complete for an exception condition | |
714 | */ | |
6c76bf95 | 715 | if (task->task_flags & TF_REQUEST_STOP) { |
a1d8b49a | 716 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
717 | complete(&task->task_stop_comp); |
718 | return; | |
719 | } | |
2235007c CH |
720 | |
721 | if (!success) | |
722 | cmd->t_tasks_failed = 1; | |
723 | ||
c66ac9db NB |
724 | /* |
725 | * Decrement the outstanding t_task_cdbs_left count. The last | |
726 | * struct se_task from struct se_cmd will complete itself into the | |
727 | * device queue depending upon int success. | |
728 | */ | |
6708bb27 | 729 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) { |
a1d8b49a | 730 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
731 | return; |
732 | } | |
733 | ||
2235007c | 734 | if (cmd->t_tasks_failed) { |
41e16e98 | 735 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
35e0e757 | 736 | INIT_WORK(&cmd->work, target_complete_failure_work); |
c66ac9db | 737 | } else { |
a1d8b49a | 738 | atomic_set(&cmd->t_transport_complete, 1); |
35e0e757 | 739 | INIT_WORK(&cmd->work, target_complete_ok_work); |
c66ac9db | 740 | } |
35e0e757 | 741 | |
35e0e757 CH |
742 | cmd->t_state = TRANSPORT_COMPLETE; |
743 | atomic_set(&cmd->t_transport_active, 1); | |
a1d8b49a | 744 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 745 | |
35e0e757 | 746 | queue_work(target_completion_wq, &cmd->work); |
c66ac9db NB |
747 | } |
748 | EXPORT_SYMBOL(transport_complete_task); | |
749 | ||
750 | /* | |
751 | * Called by transport_add_tasks_from_cmd() once a struct se_cmd's | |
752 | * struct se_task list are ready to be added to the active execution list | |
753 | * struct se_device | |
754 | ||
755 | * Called with se_dev_t->execute_task_lock called. | |
756 | */ | |
757 | static inline int transport_add_task_check_sam_attr( | |
758 | struct se_task *task, | |
759 | struct se_task *task_prev, | |
760 | struct se_device *dev) | |
761 | { | |
762 | /* | |
763 | * No SAM Task attribute emulation enabled, add to tail of | |
764 | * execution queue | |
765 | */ | |
766 | if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) { | |
767 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
768 | return 0; | |
769 | } | |
770 | /* | |
771 | * HEAD_OF_QUEUE attribute for received CDB, which means | |
772 | * the first task that is associated with a struct se_cmd goes to | |
773 | * head of the struct se_device->execute_task_list, and task_prev | |
774 | * after that for each subsequent task | |
775 | */ | |
e66ecd50 | 776 | if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db NB |
777 | list_add(&task->t_execute_list, |
778 | (task_prev != NULL) ? | |
779 | &task_prev->t_execute_list : | |
780 | &dev->execute_task_list); | |
781 | ||
6708bb27 | 782 | pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x" |
c66ac9db | 783 | " in execution queue\n", |
6708bb27 | 784 | task->task_se_cmd->t_task_cdb[0]); |
c66ac9db NB |
785 | return 1; |
786 | } | |
787 | /* | |
788 | * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been | |
789 | * transitioned from Dermant -> Active state, and are added to the end | |
790 | * of the struct se_device->execute_task_list | |
791 | */ | |
792 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
793 | return 0; | |
794 | } | |
795 | ||
796 | /* __transport_add_task_to_execute_queue(): | |
797 | * | |
798 | * Called with se_dev_t->execute_task_lock called. | |
799 | */ | |
800 | static void __transport_add_task_to_execute_queue( | |
801 | struct se_task *task, | |
802 | struct se_task *task_prev, | |
803 | struct se_device *dev) | |
804 | { | |
805 | int head_of_queue; | |
806 | ||
807 | head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev); | |
808 | atomic_inc(&dev->execute_tasks); | |
809 | ||
1880807a | 810 | if (task->t_state_active) |
c66ac9db NB |
811 | return; |
812 | /* | |
813 | * Determine if this task needs to go to HEAD_OF_QUEUE for the | |
814 | * state list as well. Running with SAM Task Attribute emulation | |
815 | * will always return head_of_queue == 0 here | |
816 | */ | |
817 | if (head_of_queue) | |
818 | list_add(&task->t_state_list, (task_prev) ? | |
819 | &task_prev->t_state_list : | |
820 | &dev->state_task_list); | |
821 | else | |
822 | list_add_tail(&task->t_state_list, &dev->state_task_list); | |
823 | ||
1880807a | 824 | task->t_state_active = true; |
c66ac9db | 825 | |
6708bb27 | 826 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", |
e3d6f909 | 827 | task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd), |
c66ac9db NB |
828 | task, dev); |
829 | } | |
830 | ||
831 | static void transport_add_tasks_to_state_queue(struct se_cmd *cmd) | |
832 | { | |
42bf829e | 833 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
834 | struct se_task *task; |
835 | unsigned long flags; | |
836 | ||
a1d8b49a AG |
837 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
838 | list_for_each_entry(task, &cmd->t_task_list, t_list) { | |
c66ac9db | 839 | spin_lock(&dev->execute_task_lock); |
1880807a CH |
840 | if (!task->t_state_active) { |
841 | list_add_tail(&task->t_state_list, | |
842 | &dev->state_task_list); | |
843 | task->t_state_active = true; | |
844 | ||
845 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", | |
846 | task->task_se_cmd->se_tfo->get_task_tag( | |
847 | task->task_se_cmd), task, dev); | |
848 | } | |
c66ac9db NB |
849 | spin_unlock(&dev->execute_task_lock); |
850 | } | |
a1d8b49a | 851 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
852 | } |
853 | ||
4d2300cc | 854 | static void __transport_add_tasks_from_cmd(struct se_cmd *cmd) |
c66ac9db | 855 | { |
5951146d | 856 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 857 | struct se_task *task, *task_prev = NULL; |
c66ac9db | 858 | |
a1d8b49a | 859 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
04629b7b | 860 | if (!list_empty(&task->t_execute_list)) |
c66ac9db NB |
861 | continue; |
862 | /* | |
863 | * __transport_add_task_to_execute_queue() handles the | |
864 | * SAM Task Attribute emulation if enabled | |
865 | */ | |
866 | __transport_add_task_to_execute_queue(task, task_prev, dev); | |
c66ac9db NB |
867 | task_prev = task; |
868 | } | |
4d2300cc NB |
869 | } |
870 | ||
871 | static void transport_add_tasks_from_cmd(struct se_cmd *cmd) | |
872 | { | |
873 | unsigned long flags; | |
874 | struct se_device *dev = cmd->se_dev; | |
875 | ||
876 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
877 | __transport_add_tasks_from_cmd(cmd); | |
c66ac9db | 878 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
879 | } |
880 | ||
04629b7b CH |
881 | void __transport_remove_task_from_execute_queue(struct se_task *task, |
882 | struct se_device *dev) | |
883 | { | |
884 | list_del_init(&task->t_execute_list); | |
885 | atomic_dec(&dev->execute_tasks); | |
886 | } | |
887 | ||
e26d99ae | 888 | static void transport_remove_task_from_execute_queue( |
c66ac9db NB |
889 | struct se_task *task, |
890 | struct se_device *dev) | |
891 | { | |
892 | unsigned long flags; | |
893 | ||
04629b7b | 894 | if (WARN_ON(list_empty(&task->t_execute_list))) |
af57c3ac | 895 | return; |
af57c3ac | 896 | |
c66ac9db | 897 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
04629b7b | 898 | __transport_remove_task_from_execute_queue(task, dev); |
c66ac9db NB |
899 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
900 | } | |
901 | ||
07bde79a | 902 | /* |
f147abb4 | 903 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a NB |
904 | */ |
905 | ||
906 | static void target_qf_do_work(struct work_struct *work) | |
907 | { | |
908 | struct se_device *dev = container_of(work, struct se_device, | |
909 | qf_work_queue); | |
bcac364a | 910 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
911 | struct se_cmd *cmd, *cmd_tmp; |
912 | ||
913 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
914 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
915 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 916 | |
bcac364a | 917 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a NB |
918 | list_del(&cmd->se_qf_node); |
919 | atomic_dec(&dev->dev_qf_count); | |
920 | smp_mb__after_atomic_dec(); | |
07bde79a | 921 | |
6708bb27 | 922 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 923 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 924 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
925 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
926 | : "UNKNOWN"); | |
f7a5cc0b CH |
927 | |
928 | transport_add_cmd_to_queue(cmd, cmd->t_state, true); | |
07bde79a | 929 | } |
07bde79a NB |
930 | } |
931 | ||
c66ac9db NB |
932 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
933 | { | |
934 | switch (cmd->data_direction) { | |
935 | case DMA_NONE: | |
936 | return "NONE"; | |
937 | case DMA_FROM_DEVICE: | |
938 | return "READ"; | |
939 | case DMA_TO_DEVICE: | |
940 | return "WRITE"; | |
941 | case DMA_BIDIRECTIONAL: | |
942 | return "BIDI"; | |
943 | default: | |
944 | break; | |
945 | } | |
946 | ||
947 | return "UNKNOWN"; | |
948 | } | |
949 | ||
950 | void transport_dump_dev_state( | |
951 | struct se_device *dev, | |
952 | char *b, | |
953 | int *bl) | |
954 | { | |
955 | *bl += sprintf(b + *bl, "Status: "); | |
956 | switch (dev->dev_status) { | |
957 | case TRANSPORT_DEVICE_ACTIVATED: | |
958 | *bl += sprintf(b + *bl, "ACTIVATED"); | |
959 | break; | |
960 | case TRANSPORT_DEVICE_DEACTIVATED: | |
961 | *bl += sprintf(b + *bl, "DEACTIVATED"); | |
962 | break; | |
963 | case TRANSPORT_DEVICE_SHUTDOWN: | |
964 | *bl += sprintf(b + *bl, "SHUTDOWN"); | |
965 | break; | |
966 | case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: | |
967 | case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: | |
968 | *bl += sprintf(b + *bl, "OFFLINE"); | |
969 | break; | |
970 | default: | |
971 | *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); | |
972 | break; | |
973 | } | |
974 | ||
65586d51 NB |
975 | *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d", |
976 | atomic_read(&dev->execute_tasks), dev->queue_depth); | |
c66ac9db | 977 | *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n", |
e3d6f909 | 978 | dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db NB |
979 | *bl += sprintf(b + *bl, " "); |
980 | } | |
981 | ||
c66ac9db NB |
982 | void transport_dump_vpd_proto_id( |
983 | struct t10_vpd *vpd, | |
984 | unsigned char *p_buf, | |
985 | int p_buf_len) | |
986 | { | |
987 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
988 | int len; | |
989 | ||
990 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
991 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
992 | ||
993 | switch (vpd->protocol_identifier) { | |
994 | case 0x00: | |
995 | sprintf(buf+len, "Fibre Channel\n"); | |
996 | break; | |
997 | case 0x10: | |
998 | sprintf(buf+len, "Parallel SCSI\n"); | |
999 | break; | |
1000 | case 0x20: | |
1001 | sprintf(buf+len, "SSA\n"); | |
1002 | break; | |
1003 | case 0x30: | |
1004 | sprintf(buf+len, "IEEE 1394\n"); | |
1005 | break; | |
1006 | case 0x40: | |
1007 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
1008 | " Protocol\n"); | |
1009 | break; | |
1010 | case 0x50: | |
1011 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
1012 | break; | |
1013 | case 0x60: | |
1014 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
1015 | break; | |
1016 | case 0x70: | |
1017 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
1018 | " Protocol\n"); | |
1019 | break; | |
1020 | case 0x80: | |
1021 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
1022 | break; | |
1023 | default: | |
1024 | sprintf(buf+len, "Unknown 0x%02x\n", | |
1025 | vpd->protocol_identifier); | |
1026 | break; | |
1027 | } | |
1028 | ||
1029 | if (p_buf) | |
1030 | strncpy(p_buf, buf, p_buf_len); | |
1031 | else | |
6708bb27 | 1032 | pr_debug("%s", buf); |
c66ac9db NB |
1033 | } |
1034 | ||
1035 | void | |
1036 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
1037 | { | |
1038 | /* | |
1039 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
1040 | * | |
1041 | * from spc3r23.pdf section 7.5.1 | |
1042 | */ | |
1043 | if (page_83[1] & 0x80) { | |
1044 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
1045 | vpd->protocol_identifier_set = 1; | |
1046 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
1047 | } | |
1048 | } | |
1049 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
1050 | ||
1051 | int transport_dump_vpd_assoc( | |
1052 | struct t10_vpd *vpd, | |
1053 | unsigned char *p_buf, | |
1054 | int p_buf_len) | |
1055 | { | |
1056 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1057 | int ret = 0; |
1058 | int len; | |
c66ac9db NB |
1059 | |
1060 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1061 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
1062 | ||
1063 | switch (vpd->association) { | |
1064 | case 0x00: | |
1065 | sprintf(buf+len, "addressed logical unit\n"); | |
1066 | break; | |
1067 | case 0x10: | |
1068 | sprintf(buf+len, "target port\n"); | |
1069 | break; | |
1070 | case 0x20: | |
1071 | sprintf(buf+len, "SCSI target device\n"); | |
1072 | break; | |
1073 | default: | |
1074 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 1075 | ret = -EINVAL; |
c66ac9db NB |
1076 | break; |
1077 | } | |
1078 | ||
1079 | if (p_buf) | |
1080 | strncpy(p_buf, buf, p_buf_len); | |
1081 | else | |
6708bb27 | 1082 | pr_debug("%s", buf); |
c66ac9db NB |
1083 | |
1084 | return ret; | |
1085 | } | |
1086 | ||
1087 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
1088 | { | |
1089 | /* | |
1090 | * The VPD identification association.. | |
1091 | * | |
1092 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
1093 | */ | |
1094 | vpd->association = (page_83[1] & 0x30); | |
1095 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
1096 | } | |
1097 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
1098 | ||
1099 | int transport_dump_vpd_ident_type( | |
1100 | struct t10_vpd *vpd, | |
1101 | unsigned char *p_buf, | |
1102 | int p_buf_len) | |
1103 | { | |
1104 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1105 | int ret = 0; |
1106 | int len; | |
c66ac9db NB |
1107 | |
1108 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1109 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
1110 | ||
1111 | switch (vpd->device_identifier_type) { | |
1112 | case 0x00: | |
1113 | sprintf(buf+len, "Vendor specific\n"); | |
1114 | break; | |
1115 | case 0x01: | |
1116 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
1117 | break; | |
1118 | case 0x02: | |
1119 | sprintf(buf+len, "EUI-64 based\n"); | |
1120 | break; | |
1121 | case 0x03: | |
1122 | sprintf(buf+len, "NAA\n"); | |
1123 | break; | |
1124 | case 0x04: | |
1125 | sprintf(buf+len, "Relative target port identifier\n"); | |
1126 | break; | |
1127 | case 0x08: | |
1128 | sprintf(buf+len, "SCSI name string\n"); | |
1129 | break; | |
1130 | default: | |
1131 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
1132 | vpd->device_identifier_type); | |
e3d6f909 | 1133 | ret = -EINVAL; |
c66ac9db NB |
1134 | break; |
1135 | } | |
1136 | ||
e3d6f909 AG |
1137 | if (p_buf) { |
1138 | if (p_buf_len < strlen(buf)+1) | |
1139 | return -EINVAL; | |
c66ac9db | 1140 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 1141 | } else { |
6708bb27 | 1142 | pr_debug("%s", buf); |
e3d6f909 | 1143 | } |
c66ac9db NB |
1144 | |
1145 | return ret; | |
1146 | } | |
1147 | ||
1148 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
1149 | { | |
1150 | /* | |
1151 | * The VPD identifier type.. | |
1152 | * | |
1153 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
1154 | */ | |
1155 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
1156 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
1157 | } | |
1158 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
1159 | ||
1160 | int transport_dump_vpd_ident( | |
1161 | struct t10_vpd *vpd, | |
1162 | unsigned char *p_buf, | |
1163 | int p_buf_len) | |
1164 | { | |
1165 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1166 | int ret = 0; | |
1167 | ||
1168 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1169 | ||
1170 | switch (vpd->device_identifier_code_set) { | |
1171 | case 0x01: /* Binary */ | |
1172 | sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", | |
1173 | &vpd->device_identifier[0]); | |
1174 | break; | |
1175 | case 0x02: /* ASCII */ | |
1176 | sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", | |
1177 | &vpd->device_identifier[0]); | |
1178 | break; | |
1179 | case 0x03: /* UTF-8 */ | |
1180 | sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", | |
1181 | &vpd->device_identifier[0]); | |
1182 | break; | |
1183 | default: | |
1184 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1185 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1186 | ret = -EINVAL; |
c66ac9db NB |
1187 | break; |
1188 | } | |
1189 | ||
1190 | if (p_buf) | |
1191 | strncpy(p_buf, buf, p_buf_len); | |
1192 | else | |
6708bb27 | 1193 | pr_debug("%s", buf); |
c66ac9db NB |
1194 | |
1195 | return ret; | |
1196 | } | |
1197 | ||
1198 | int | |
1199 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1200 | { | |
1201 | static const char hex_str[] = "0123456789abcdef"; | |
1202 | int j = 0, i = 4; /* offset to start of the identifer */ | |
1203 | ||
1204 | /* | |
1205 | * The VPD Code Set (encoding) | |
1206 | * | |
1207 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1208 | */ | |
1209 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1210 | switch (vpd->device_identifier_code_set) { | |
1211 | case 0x01: /* Binary */ | |
1212 | vpd->device_identifier[j++] = | |
1213 | hex_str[vpd->device_identifier_type]; | |
1214 | while (i < (4 + page_83[3])) { | |
1215 | vpd->device_identifier[j++] = | |
1216 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1217 | vpd->device_identifier[j++] = | |
1218 | hex_str[page_83[i] & 0x0f]; | |
1219 | i++; | |
1220 | } | |
1221 | break; | |
1222 | case 0x02: /* ASCII */ | |
1223 | case 0x03: /* UTF-8 */ | |
1224 | while (i < (4 + page_83[3])) | |
1225 | vpd->device_identifier[j++] = page_83[i++]; | |
1226 | break; | |
1227 | default: | |
1228 | break; | |
1229 | } | |
1230 | ||
1231 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1232 | } | |
1233 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1234 | ||
1235 | static void core_setup_task_attr_emulation(struct se_device *dev) | |
1236 | { | |
1237 | /* | |
1238 | * If this device is from Target_Core_Mod/pSCSI, disable the | |
1239 | * SAM Task Attribute emulation. | |
1240 | * | |
1241 | * This is currently not available in upsream Linux/SCSI Target | |
1242 | * mode code, and is assumed to be disabled while using TCM/pSCSI. | |
1243 | */ | |
e3d6f909 | 1244 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { |
c66ac9db NB |
1245 | dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; |
1246 | return; | |
1247 | } | |
1248 | ||
1249 | dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; | |
6708bb27 | 1250 | pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" |
e3d6f909 AG |
1251 | " device\n", dev->transport->name, |
1252 | dev->transport->get_device_rev(dev)); | |
c66ac9db NB |
1253 | } |
1254 | ||
1255 | static void scsi_dump_inquiry(struct se_device *dev) | |
1256 | { | |
e3d6f909 | 1257 | struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; |
e59a41b6 | 1258 | char buf[17]; |
c66ac9db NB |
1259 | int i, device_type; |
1260 | /* | |
1261 | * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer | |
1262 | */ | |
c66ac9db NB |
1263 | for (i = 0; i < 8; i++) |
1264 | if (wwn->vendor[i] >= 0x20) | |
e59a41b6 | 1265 | buf[i] = wwn->vendor[i]; |
c66ac9db | 1266 | else |
e59a41b6 SAS |
1267 | buf[i] = ' '; |
1268 | buf[i] = '\0'; | |
1269 | pr_debug(" Vendor: %s\n", buf); | |
c66ac9db | 1270 | |
c66ac9db NB |
1271 | for (i = 0; i < 16; i++) |
1272 | if (wwn->model[i] >= 0x20) | |
e59a41b6 | 1273 | buf[i] = wwn->model[i]; |
c66ac9db | 1274 | else |
e59a41b6 SAS |
1275 | buf[i] = ' '; |
1276 | buf[i] = '\0'; | |
1277 | pr_debug(" Model: %s\n", buf); | |
c66ac9db | 1278 | |
c66ac9db NB |
1279 | for (i = 0; i < 4; i++) |
1280 | if (wwn->revision[i] >= 0x20) | |
e59a41b6 | 1281 | buf[i] = wwn->revision[i]; |
c66ac9db | 1282 | else |
e59a41b6 SAS |
1283 | buf[i] = ' '; |
1284 | buf[i] = '\0'; | |
1285 | pr_debug(" Revision: %s\n", buf); | |
c66ac9db | 1286 | |
e3d6f909 | 1287 | device_type = dev->transport->get_device_type(dev); |
6708bb27 AG |
1288 | pr_debug(" Type: %s ", scsi_device_type(device_type)); |
1289 | pr_debug(" ANSI SCSI revision: %02x\n", | |
e3d6f909 | 1290 | dev->transport->get_device_rev(dev)); |
c66ac9db NB |
1291 | } |
1292 | ||
1293 | struct se_device *transport_add_device_to_core_hba( | |
1294 | struct se_hba *hba, | |
1295 | struct se_subsystem_api *transport, | |
1296 | struct se_subsystem_dev *se_dev, | |
1297 | u32 device_flags, | |
1298 | void *transport_dev, | |
1299 | struct se_dev_limits *dev_limits, | |
1300 | const char *inquiry_prod, | |
1301 | const char *inquiry_rev) | |
1302 | { | |
12a18bdc | 1303 | int force_pt; |
c66ac9db NB |
1304 | struct se_device *dev; |
1305 | ||
1306 | dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); | |
6708bb27 AG |
1307 | if (!dev) { |
1308 | pr_err("Unable to allocate memory for se_dev_t\n"); | |
c66ac9db NB |
1309 | return NULL; |
1310 | } | |
c66ac9db | 1311 | |
e3d6f909 | 1312 | transport_init_queue_obj(&dev->dev_queue_obj); |
c66ac9db NB |
1313 | dev->dev_flags = device_flags; |
1314 | dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; | |
5951146d | 1315 | dev->dev_ptr = transport_dev; |
c66ac9db NB |
1316 | dev->se_hba = hba; |
1317 | dev->se_sub_dev = se_dev; | |
1318 | dev->transport = transport; | |
c66ac9db NB |
1319 | INIT_LIST_HEAD(&dev->dev_list); |
1320 | INIT_LIST_HEAD(&dev->dev_sep_list); | |
1321 | INIT_LIST_HEAD(&dev->dev_tmr_list); | |
1322 | INIT_LIST_HEAD(&dev->execute_task_list); | |
1323 | INIT_LIST_HEAD(&dev->delayed_cmd_list); | |
c66ac9db | 1324 | INIT_LIST_HEAD(&dev->state_task_list); |
07bde79a | 1325 | INIT_LIST_HEAD(&dev->qf_cmd_list); |
c66ac9db NB |
1326 | spin_lock_init(&dev->execute_task_lock); |
1327 | spin_lock_init(&dev->delayed_cmd_lock); | |
c66ac9db NB |
1328 | spin_lock_init(&dev->dev_reservation_lock); |
1329 | spin_lock_init(&dev->dev_status_lock); | |
c66ac9db NB |
1330 | spin_lock_init(&dev->se_port_lock); |
1331 | spin_lock_init(&dev->se_tmr_lock); | |
07bde79a | 1332 | spin_lock_init(&dev->qf_cmd_lock); |
c66ac9db NB |
1333 | atomic_set(&dev->dev_ordered_id, 0); |
1334 | ||
1335 | se_dev_set_default_attribs(dev, dev_limits); | |
1336 | ||
1337 | dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); | |
1338 | dev->creation_time = get_jiffies_64(); | |
1339 | spin_lock_init(&dev->stats_lock); | |
1340 | ||
1341 | spin_lock(&hba->device_lock); | |
1342 | list_add_tail(&dev->dev_list, &hba->hba_dev_list); | |
1343 | hba->dev_count++; | |
1344 | spin_unlock(&hba->device_lock); | |
1345 | /* | |
1346 | * Setup the SAM Task Attribute emulation for struct se_device | |
1347 | */ | |
1348 | core_setup_task_attr_emulation(dev); | |
1349 | /* | |
1350 | * Force PR and ALUA passthrough emulation with internal object use. | |
1351 | */ | |
1352 | force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); | |
1353 | /* | |
1354 | * Setup the Reservations infrastructure for struct se_device | |
1355 | */ | |
1356 | core_setup_reservations(dev, force_pt); | |
1357 | /* | |
1358 | * Setup the Asymmetric Logical Unit Assignment for struct se_device | |
1359 | */ | |
1360 | if (core_setup_alua(dev, force_pt) < 0) | |
1361 | goto out; | |
1362 | ||
1363 | /* | |
1364 | * Startup the struct se_device processing thread | |
1365 | */ | |
1366 | dev->process_thread = kthread_run(transport_processing_thread, dev, | |
e3d6f909 | 1367 | "LIO_%s", dev->transport->name); |
c66ac9db | 1368 | if (IS_ERR(dev->process_thread)) { |
6708bb27 | 1369 | pr_err("Unable to create kthread: LIO_%s\n", |
e3d6f909 | 1370 | dev->transport->name); |
c66ac9db NB |
1371 | goto out; |
1372 | } | |
07bde79a NB |
1373 | /* |
1374 | * Setup work_queue for QUEUE_FULL | |
1375 | */ | |
1376 | INIT_WORK(&dev->qf_work_queue, target_qf_do_work); | |
c66ac9db NB |
1377 | /* |
1378 | * Preload the initial INQUIRY const values if we are doing | |
1379 | * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI | |
1380 | * passthrough because this is being provided by the backend LLD. | |
1381 | * This is required so that transport_get_inquiry() copies these | |
1382 | * originals once back into DEV_T10_WWN(dev) for the virtual device | |
1383 | * setup. | |
1384 | */ | |
e3d6f909 | 1385 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
f22c1196 | 1386 | if (!inquiry_prod || !inquiry_rev) { |
6708bb27 | 1387 | pr_err("All non TCM/pSCSI plugins require" |
c66ac9db NB |
1388 | " INQUIRY consts\n"); |
1389 | goto out; | |
1390 | } | |
1391 | ||
e3d6f909 AG |
1392 | strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8); |
1393 | strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16); | |
1394 | strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4); | |
c66ac9db NB |
1395 | } |
1396 | scsi_dump_inquiry(dev); | |
1397 | ||
12a18bdc | 1398 | return dev; |
c66ac9db | 1399 | out: |
c66ac9db NB |
1400 | kthread_stop(dev->process_thread); |
1401 | ||
1402 | spin_lock(&hba->device_lock); | |
1403 | list_del(&dev->dev_list); | |
1404 | hba->dev_count--; | |
1405 | spin_unlock(&hba->device_lock); | |
1406 | ||
1407 | se_release_vpd_for_dev(dev); | |
1408 | ||
c66ac9db NB |
1409 | kfree(dev); |
1410 | ||
1411 | return NULL; | |
1412 | } | |
1413 | EXPORT_SYMBOL(transport_add_device_to_core_hba); | |
1414 | ||
1415 | /* transport_generic_prepare_cdb(): | |
1416 | * | |
1417 | * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will | |
1418 | * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2. | |
1419 | * The point of this is since we are mapping iSCSI LUNs to | |
1420 | * SCSI Target IDs having a non-zero LUN in the CDB will throw the | |
1421 | * devices and HBAs for a loop. | |
1422 | */ | |
1423 | static inline void transport_generic_prepare_cdb( | |
1424 | unsigned char *cdb) | |
1425 | { | |
1426 | switch (cdb[0]) { | |
1427 | case READ_10: /* SBC - RDProtect */ | |
1428 | case READ_12: /* SBC - RDProtect */ | |
1429 | case READ_16: /* SBC - RDProtect */ | |
1430 | case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ | |
1431 | case VERIFY: /* SBC - VRProtect */ | |
1432 | case VERIFY_16: /* SBC - VRProtect */ | |
1433 | case WRITE_VERIFY: /* SBC - VRProtect */ | |
1434 | case WRITE_VERIFY_12: /* SBC - VRProtect */ | |
1435 | break; | |
1436 | default: | |
1437 | cdb[1] &= 0x1f; /* clear logical unit number */ | |
1438 | break; | |
1439 | } | |
1440 | } | |
1441 | ||
1442 | static struct se_task * | |
1443 | transport_generic_get_task(struct se_cmd *cmd, | |
1444 | enum dma_data_direction data_direction) | |
1445 | { | |
1446 | struct se_task *task; | |
5951146d | 1447 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1448 | |
6708bb27 | 1449 | task = dev->transport->alloc_task(cmd->t_task_cdb); |
c66ac9db | 1450 | if (!task) { |
6708bb27 | 1451 | pr_err("Unable to allocate struct se_task\n"); |
c66ac9db NB |
1452 | return NULL; |
1453 | } | |
1454 | ||
1455 | INIT_LIST_HEAD(&task->t_list); | |
1456 | INIT_LIST_HEAD(&task->t_execute_list); | |
1457 | INIT_LIST_HEAD(&task->t_state_list); | |
1458 | init_completion(&task->task_stop_comp); | |
c66ac9db | 1459 | task->task_se_cmd = cmd; |
c66ac9db NB |
1460 | task->task_data_direction = data_direction; |
1461 | ||
c66ac9db NB |
1462 | return task; |
1463 | } | |
1464 | ||
1465 | static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *); | |
1466 | ||
c66ac9db NB |
1467 | /* |
1468 | * Used by fabric modules containing a local struct se_cmd within their | |
1469 | * fabric dependent per I/O descriptor. | |
1470 | */ | |
1471 | void transport_init_se_cmd( | |
1472 | struct se_cmd *cmd, | |
1473 | struct target_core_fabric_ops *tfo, | |
1474 | struct se_session *se_sess, | |
1475 | u32 data_length, | |
1476 | int data_direction, | |
1477 | int task_attr, | |
1478 | unsigned char *sense_buffer) | |
1479 | { | |
5951146d AG |
1480 | INIT_LIST_HEAD(&cmd->se_lun_node); |
1481 | INIT_LIST_HEAD(&cmd->se_delayed_node); | |
07bde79a | 1482 | INIT_LIST_HEAD(&cmd->se_qf_node); |
79a7fef2 | 1483 | INIT_LIST_HEAD(&cmd->se_queue_node); |
a17f091d | 1484 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
a1d8b49a AG |
1485 | INIT_LIST_HEAD(&cmd->t_task_list); |
1486 | init_completion(&cmd->transport_lun_fe_stop_comp); | |
1487 | init_completion(&cmd->transport_lun_stop_comp); | |
1488 | init_completion(&cmd->t_transport_stop_comp); | |
a17f091d | 1489 | init_completion(&cmd->cmd_wait_comp); |
a1d8b49a AG |
1490 | spin_lock_init(&cmd->t_state_lock); |
1491 | atomic_set(&cmd->transport_dev_active, 1); | |
c66ac9db NB |
1492 | |
1493 | cmd->se_tfo = tfo; | |
1494 | cmd->se_sess = se_sess; | |
1495 | cmd->data_length = data_length; | |
1496 | cmd->data_direction = data_direction; | |
1497 | cmd->sam_task_attr = task_attr; | |
1498 | cmd->sense_buffer = sense_buffer; | |
1499 | } | |
1500 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1501 | ||
1502 | static int transport_check_alloc_task_attr(struct se_cmd *cmd) | |
1503 | { | |
1504 | /* | |
1505 | * Check if SAM Task Attribute emulation is enabled for this | |
1506 | * struct se_device storage object | |
1507 | */ | |
5951146d | 1508 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1509 | return 0; |
1510 | ||
e66ecd50 | 1511 | if (cmd->sam_task_attr == MSG_ACA_TAG) { |
6708bb27 | 1512 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1513 | " emulation is not supported\n"); |
e3d6f909 | 1514 | return -EINVAL; |
c66ac9db NB |
1515 | } |
1516 | /* | |
1517 | * Used to determine when ORDERED commands should go from | |
1518 | * Dormant to Active status. | |
1519 | */ | |
5951146d | 1520 | cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id); |
c66ac9db | 1521 | smp_mb__after_atomic_inc(); |
6708bb27 | 1522 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1523 | cmd->se_ordered_id, cmd->sam_task_attr, |
6708bb27 | 1524 | cmd->se_dev->transport->name); |
c66ac9db NB |
1525 | return 0; |
1526 | } | |
1527 | ||
c66ac9db NB |
1528 | /* transport_generic_allocate_tasks(): |
1529 | * | |
1530 | * Called from fabric RX Thread. | |
1531 | */ | |
1532 | int transport_generic_allocate_tasks( | |
1533 | struct se_cmd *cmd, | |
1534 | unsigned char *cdb) | |
1535 | { | |
1536 | int ret; | |
1537 | ||
1538 | transport_generic_prepare_cdb(cdb); | |
c66ac9db NB |
1539 | /* |
1540 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1541 | * for VARIABLE_LENGTH_CMD | |
1542 | */ | |
1543 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1544 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1545 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1546 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
03e98c9e NB |
1547 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1548 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
e3d6f909 | 1549 | return -EINVAL; |
c66ac9db NB |
1550 | } |
1551 | /* | |
1552 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1553 | * allocate the additional extended CDB buffer now.. Otherwise | |
1554 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1555 | */ | |
a1d8b49a AG |
1556 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1557 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1558 | GFP_KERNEL); |
6708bb27 AG |
1559 | if (!cmd->t_task_cdb) { |
1560 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1561 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1562 | scsi_command_size(cdb), |
a1d8b49a | 1563 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
03e98c9e NB |
1564 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1565 | cmd->scsi_sense_reason = | |
1566 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
e3d6f909 | 1567 | return -ENOMEM; |
c66ac9db NB |
1568 | } |
1569 | } else | |
a1d8b49a | 1570 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1571 | /* |
a1d8b49a | 1572 | * Copy the original CDB into cmd-> |
c66ac9db | 1573 | */ |
a1d8b49a | 1574 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
c66ac9db NB |
1575 | /* |
1576 | * Setup the received CDB based on SCSI defined opcodes and | |
1577 | * perform unit attention, persistent reservations and ALUA | |
a1d8b49a | 1578 | * checks for virtual device backends. The cmd->t_task_cdb |
c66ac9db NB |
1579 | * pointer is expected to be setup before we reach this point. |
1580 | */ | |
1581 | ret = transport_generic_cmd_sequencer(cmd, cdb); | |
1582 | if (ret < 0) | |
1583 | return ret; | |
1584 | /* | |
1585 | * Check for SAM Task Attribute Emulation | |
1586 | */ | |
1587 | if (transport_check_alloc_task_attr(cmd) < 0) { | |
1588 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1589 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 1590 | return -EINVAL; |
c66ac9db NB |
1591 | } |
1592 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
1593 | if (cmd->se_lun->lun_sep) | |
1594 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; | |
1595 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
1596 | return 0; | |
1597 | } | |
1598 | EXPORT_SYMBOL(transport_generic_allocate_tasks); | |
1599 | ||
695434e1 NB |
1600 | /* |
1601 | * Used by fabric module frontends to queue tasks directly. | |
1602 | * Many only be used from process context only | |
1603 | */ | |
1604 | int transport_handle_cdb_direct( | |
1605 | struct se_cmd *cmd) | |
1606 | { | |
dd8ae59d NB |
1607 | int ret; |
1608 | ||
695434e1 NB |
1609 | if (!cmd->se_lun) { |
1610 | dump_stack(); | |
6708bb27 | 1611 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1612 | return -EINVAL; |
1613 | } | |
1614 | if (in_interrupt()) { | |
1615 | dump_stack(); | |
6708bb27 | 1616 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1617 | " from interrupt context\n"); |
1618 | return -EINVAL; | |
1619 | } | |
dd8ae59d NB |
1620 | /* |
1621 | * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following | |
1622 | * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue() | |
1623 | * in existing usage to ensure that outstanding descriptors are handled | |
d14921d6 | 1624 | * correctly during shutdown via transport_wait_for_tasks() |
dd8ae59d NB |
1625 | * |
1626 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1627 | * this to be called for initial descriptor submission. | |
1628 | */ | |
1629 | cmd->t_state = TRANSPORT_NEW_CMD; | |
1630 | atomic_set(&cmd->t_transport_active, 1); | |
1631 | /* | |
1632 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1633 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1634 | * and call transport_generic_request_failure() if necessary.. | |
1635 | */ | |
1636 | ret = transport_generic_new_cmd(cmd); | |
03e98c9e NB |
1637 | if (ret < 0) |
1638 | transport_generic_request_failure(cmd); | |
1639 | ||
dd8ae59d | 1640 | return 0; |
695434e1 NB |
1641 | } |
1642 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1643 | ||
a6360785 NB |
1644 | /** |
1645 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd | |
1646 | * | |
1647 | * @se_cmd: command descriptor to submit | |
1648 | * @se_sess: associated se_sess for endpoint | |
1649 | * @cdb: pointer to SCSI CDB | |
1650 | * @sense: pointer to SCSI sense buffer | |
1651 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1652 | * @data_length: fabric expected data transfer length | |
1653 | * @task_addr: SAM task attribute | |
1654 | * @data_dir: DMA data direction | |
1655 | * @flags: flags for command submission from target_sc_flags_tables | |
1656 | * | |
1657 | * This may only be called from process context, and also currently | |
1658 | * assumes internal allocation of fabric payload buffer by target-core. | |
1659 | **/ | |
1edcdb49 | 1660 | void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, |
a6360785 NB |
1661 | unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, |
1662 | u32 data_length, int task_attr, int data_dir, int flags) | |
1663 | { | |
1664 | struct se_portal_group *se_tpg; | |
1665 | int rc; | |
1666 | ||
1667 | se_tpg = se_sess->se_tpg; | |
1668 | BUG_ON(!se_tpg); | |
1669 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1670 | BUG_ON(in_interrupt()); | |
1671 | /* | |
1672 | * Initialize se_cmd for target operation. From this point | |
1673 | * exceptions are handled by sending exception status via | |
1674 | * target_core_fabric_ops->queue_status() callback | |
1675 | */ | |
1676 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1677 | data_length, data_dir, task_attr, sense); | |
1678 | /* | |
1679 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1680 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1681 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1682 | * kref_put() to happen during fabric packet acknowledgement. | |
1683 | */ | |
1684 | target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); | |
1685 | /* | |
1686 | * Signal bidirectional data payloads to target-core | |
1687 | */ | |
1688 | if (flags & TARGET_SCF_BIDI_OP) | |
1689 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1690 | /* | |
1691 | * Locate se_lun pointer and attach it to struct se_cmd | |
1692 | */ | |
735703ca NB |
1693 | if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) { |
1694 | transport_send_check_condition_and_sense(se_cmd, | |
1695 | se_cmd->scsi_sense_reason, 0); | |
1696 | target_put_sess_cmd(se_sess, se_cmd); | |
1697 | return; | |
1698 | } | |
a6360785 NB |
1699 | /* |
1700 | * Sanitize CDBs via transport_generic_cmd_sequencer() and | |
1701 | * allocate the necessary tasks to complete the received CDB+data | |
1702 | */ | |
1703 | rc = transport_generic_allocate_tasks(se_cmd, cdb); | |
735703ca NB |
1704 | if (rc != 0) { |
1705 | transport_generic_request_failure(se_cmd); | |
1706 | return; | |
1707 | } | |
a6360785 NB |
1708 | /* |
1709 | * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend | |
1710 | * for immediate execution of READs, otherwise wait for | |
1711 | * transport_generic_handle_data() to be called for WRITEs | |
1712 | * when fabric has filled the incoming buffer. | |
1713 | */ | |
1714 | transport_handle_cdb_direct(se_cmd); | |
1edcdb49 | 1715 | return; |
a6360785 NB |
1716 | } |
1717 | EXPORT_SYMBOL(target_submit_cmd); | |
1718 | ||
c66ac9db NB |
1719 | /* |
1720 | * Used by fabric module frontends defining a TFO->new_cmd_map() caller | |
1721 | * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to | |
1722 | * complete setup in TCM process context w/ TFO->new_cmd_map(). | |
1723 | */ | |
1724 | int transport_generic_handle_cdb_map( | |
1725 | struct se_cmd *cmd) | |
1726 | { | |
e3d6f909 | 1727 | if (!cmd->se_lun) { |
c66ac9db | 1728 | dump_stack(); |
6708bb27 | 1729 | pr_err("cmd->se_lun is NULL\n"); |
e3d6f909 | 1730 | return -EINVAL; |
c66ac9db NB |
1731 | } |
1732 | ||
f7a5cc0b | 1733 | transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false); |
c66ac9db NB |
1734 | return 0; |
1735 | } | |
1736 | EXPORT_SYMBOL(transport_generic_handle_cdb_map); | |
1737 | ||
1738 | /* transport_generic_handle_data(): | |
1739 | * | |
1740 | * | |
1741 | */ | |
1742 | int transport_generic_handle_data( | |
1743 | struct se_cmd *cmd) | |
1744 | { | |
1745 | /* | |
1746 | * For the software fabric case, then we assume the nexus is being | |
1747 | * failed/shutdown when signals are pending from the kthread context | |
1748 | * caller, so we return a failure. For the HW target mode case running | |
1749 | * in interrupt code, the signal_pending() check is skipped. | |
1750 | */ | |
1751 | if (!in_interrupt() && signal_pending(current)) | |
e3d6f909 | 1752 | return -EPERM; |
c66ac9db NB |
1753 | /* |
1754 | * If the received CDB has aleady been ABORTED by the generic | |
1755 | * target engine, we now call transport_check_aborted_status() | |
1756 | * to queue any delated TASK_ABORTED status for the received CDB to the | |
25985edc | 1757 | * fabric module as we are expecting no further incoming DATA OUT |
c66ac9db NB |
1758 | * sequences at this point. |
1759 | */ | |
1760 | if (transport_check_aborted_status(cmd, 1) != 0) | |
1761 | return 0; | |
1762 | ||
f7a5cc0b | 1763 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false); |
c66ac9db NB |
1764 | return 0; |
1765 | } | |
1766 | EXPORT_SYMBOL(transport_generic_handle_data); | |
1767 | ||
1768 | /* transport_generic_handle_tmr(): | |
1769 | * | |
1770 | * | |
1771 | */ | |
1772 | int transport_generic_handle_tmr( | |
1773 | struct se_cmd *cmd) | |
1774 | { | |
f7a5cc0b | 1775 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false); |
c66ac9db NB |
1776 | return 0; |
1777 | } | |
1778 | EXPORT_SYMBOL(transport_generic_handle_tmr); | |
1779 | ||
cdbb70bb CH |
1780 | /* |
1781 | * If the task is active, request it to be stopped and sleep until it | |
1782 | * has completed. | |
1783 | */ | |
1784 | bool target_stop_task(struct se_task *task, unsigned long *flags) | |
1785 | { | |
1786 | struct se_cmd *cmd = task->task_se_cmd; | |
1787 | bool was_active = false; | |
1788 | ||
1789 | if (task->task_flags & TF_ACTIVE) { | |
1790 | task->task_flags |= TF_REQUEST_STOP; | |
1791 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); | |
1792 | ||
1793 | pr_debug("Task %p waiting to complete\n", task); | |
1794 | wait_for_completion(&task->task_stop_comp); | |
1795 | pr_debug("Task %p stopped successfully\n", task); | |
1796 | ||
1797 | spin_lock_irqsave(&cmd->t_state_lock, *flags); | |
1798 | atomic_dec(&cmd->t_task_cdbs_left); | |
1799 | task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP); | |
1800 | was_active = true; | |
1801 | } | |
1802 | ||
cdbb70bb CH |
1803 | return was_active; |
1804 | } | |
1805 | ||
c66ac9db NB |
1806 | static int transport_stop_tasks_for_cmd(struct se_cmd *cmd) |
1807 | { | |
1808 | struct se_task *task, *task_tmp; | |
1809 | unsigned long flags; | |
1810 | int ret = 0; | |
1811 | ||
6708bb27 | 1812 | pr_debug("ITT[0x%08x] - Stopping tasks\n", |
e3d6f909 | 1813 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
1814 | |
1815 | /* | |
1816 | * No tasks remain in the execution queue | |
1817 | */ | |
a1d8b49a | 1818 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 1819 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 1820 | &cmd->t_task_list, t_list) { |
04629b7b | 1821 | pr_debug("Processing task %p\n", task); |
c66ac9db NB |
1822 | /* |
1823 | * If the struct se_task has not been sent and is not active, | |
1824 | * remove the struct se_task from the execution queue. | |
1825 | */ | |
6c76bf95 | 1826 | if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) { |
a1d8b49a | 1827 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
1828 | flags); |
1829 | transport_remove_task_from_execute_queue(task, | |
42bf829e | 1830 | cmd->se_dev); |
c66ac9db | 1831 | |
04629b7b | 1832 | pr_debug("Task %p removed from execute queue\n", task); |
a1d8b49a | 1833 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
1834 | continue; |
1835 | } | |
1836 | ||
cdbb70bb | 1837 | if (!target_stop_task(task, &flags)) { |
04629b7b | 1838 | pr_debug("Task %p - did nothing\n", task); |
c66ac9db NB |
1839 | ret++; |
1840 | } | |
c66ac9db | 1841 | } |
a1d8b49a | 1842 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
1843 | |
1844 | return ret; | |
1845 | } | |
1846 | ||
c66ac9db NB |
1847 | /* |
1848 | * Handle SAM-esque emulation for generic transport request failures. | |
1849 | */ | |
03e98c9e | 1850 | static void transport_generic_request_failure(struct se_cmd *cmd) |
c66ac9db | 1851 | { |
07bde79a NB |
1852 | int ret = 0; |
1853 | ||
6708bb27 | 1854 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
e3d6f909 | 1855 | " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 1856 | cmd->t_task_cdb[0]); |
03e98c9e | 1857 | pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n", |
e3d6f909 | 1858 | cmd->se_tfo->get_cmd_state(cmd), |
03e98c9e | 1859 | cmd->t_state, cmd->scsi_sense_reason); |
6708bb27 | 1860 | pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d" |
c66ac9db NB |
1861 | " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --" |
1862 | " t_transport_active: %d t_transport_stop: %d" | |
6708bb27 | 1863 | " t_transport_sent: %d\n", cmd->t_task_list_num, |
a1d8b49a AG |
1864 | atomic_read(&cmd->t_task_cdbs_left), |
1865 | atomic_read(&cmd->t_task_cdbs_sent), | |
1866 | atomic_read(&cmd->t_task_cdbs_ex_left), | |
1867 | atomic_read(&cmd->t_transport_active), | |
1868 | atomic_read(&cmd->t_transport_stop), | |
1869 | atomic_read(&cmd->t_transport_sent)); | |
c66ac9db | 1870 | |
c66ac9db NB |
1871 | /* |
1872 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1873 | */ | |
1874 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
1875 | transport_complete_task_attr(cmd); | |
1876 | ||
03e98c9e NB |
1877 | switch (cmd->scsi_sense_reason) { |
1878 | case TCM_NON_EXISTENT_LUN: | |
1879 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1880 | case TCM_INVALID_CDB_FIELD: | |
1881 | case TCM_INVALID_PARAMETER_LIST: | |
1882 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
1883 | case TCM_UNKNOWN_MODE_PAGE: | |
1884 | case TCM_WRITE_PROTECTED: | |
1885 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
1886 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1887 | case TCM_CHECK_CONDITION_NOT_READY: | |
c66ac9db | 1888 | break; |
03e98c9e | 1889 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1890 | /* |
1891 | * No SENSE Data payload for this case, set SCSI Status | |
1892 | * and queue the response to $FABRIC_MOD. | |
1893 | * | |
1894 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1895 | */ | |
1896 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1897 | /* | |
1898 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1899 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1900 | * CONFLICT STATUS. | |
1901 | * | |
1902 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1903 | */ | |
e3d6f909 AG |
1904 | if (cmd->se_sess && |
1905 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) | |
1906 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, | |
c66ac9db NB |
1907 | cmd->orig_fe_lun, 0x2C, |
1908 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1909 | ||
07bde79a | 1910 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 1911 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1912 | goto queue_full; |
c66ac9db | 1913 | goto check_stop; |
c66ac9db | 1914 | default: |
6708bb27 | 1915 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
03e98c9e | 1916 | cmd->t_task_cdb[0], cmd->scsi_sense_reason); |
c66ac9db NB |
1917 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
1918 | break; | |
1919 | } | |
16ab8e60 NB |
1920 | /* |
1921 | * If a fabric does not define a cmd->se_tfo->new_cmd_map caller, | |
1922 | * make the call to transport_send_check_condition_and_sense() | |
1923 | * directly. Otherwise expect the fabric to make the call to | |
1924 | * transport_send_check_condition_and_sense() after handling | |
1925 | * possible unsoliticied write data payloads. | |
1926 | */ | |
03e98c9e NB |
1927 | ret = transport_send_check_condition_and_sense(cmd, |
1928 | cmd->scsi_sense_reason, 0); | |
1929 | if (ret == -EAGAIN || ret == -ENOMEM) | |
1930 | goto queue_full; | |
07bde79a | 1931 | |
c66ac9db NB |
1932 | check_stop: |
1933 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1934 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1935 | ; |
07bde79a NB |
1936 | return; |
1937 | ||
1938 | queue_full: | |
e057f533 CH |
1939 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1940 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
1941 | } |
1942 | ||
c66ac9db NB |
1943 | static inline u32 transport_lba_21(unsigned char *cdb) |
1944 | { | |
1945 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
1946 | } | |
1947 | ||
1948 | static inline u32 transport_lba_32(unsigned char *cdb) | |
1949 | { | |
1950 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
1951 | } | |
1952 | ||
1953 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
1954 | { | |
1955 | unsigned int __v1, __v2; | |
1956 | ||
1957 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
1958 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
1959 | ||
1960 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
1961 | } | |
1962 | ||
1963 | /* | |
1964 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
1965 | */ | |
1966 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
1967 | { | |
1968 | unsigned int __v1, __v2; | |
1969 | ||
1970 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
1971 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
1972 | ||
1973 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
1974 | } | |
1975 | ||
1976 | static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd) | |
1977 | { | |
1978 | unsigned long flags; | |
1979 | ||
a1d8b49a | 1980 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
c66ac9db | 1981 | se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
a1d8b49a | 1982 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
1983 | } |
1984 | ||
c66ac9db NB |
1985 | /* |
1986 | * Called from Fabric Module context from transport_execute_tasks() | |
1987 | * | |
1988 | * The return of this function determins if the tasks from struct se_cmd | |
1989 | * get added to the execution queue in transport_execute_tasks(), | |
1990 | * or are added to the delayed or ordered lists here. | |
1991 | */ | |
1992 | static inline int transport_execute_task_attr(struct se_cmd *cmd) | |
1993 | { | |
5951146d | 1994 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1995 | return 1; |
1996 | /* | |
25985edc | 1997 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
1998 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
1999 | */ | |
e66ecd50 | 2000 | if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
6708bb27 | 2001 | pr_debug("Added HEAD_OF_QUEUE for CDB:" |
c66ac9db | 2002 | " 0x%02x, se_ordered_id: %u\n", |
6708bb27 | 2003 | cmd->t_task_cdb[0], |
c66ac9db NB |
2004 | cmd->se_ordered_id); |
2005 | return 1; | |
e66ecd50 | 2006 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
5951146d | 2007 | atomic_inc(&cmd->se_dev->dev_ordered_sync); |
c66ac9db NB |
2008 | smp_mb__after_atomic_inc(); |
2009 | ||
6708bb27 | 2010 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered" |
c66ac9db | 2011 | " list, se_ordered_id: %u\n", |
a1d8b49a | 2012 | cmd->t_task_cdb[0], |
c66ac9db NB |
2013 | cmd->se_ordered_id); |
2014 | /* | |
2015 | * Add ORDERED command to tail of execution queue if | |
2016 | * no other older commands exist that need to be | |
2017 | * completed first. | |
2018 | */ | |
6708bb27 | 2019 | if (!atomic_read(&cmd->se_dev->simple_cmds)) |
c66ac9db NB |
2020 | return 1; |
2021 | } else { | |
2022 | /* | |
2023 | * For SIMPLE and UNTAGGED Task Attribute commands | |
2024 | */ | |
5951146d | 2025 | atomic_inc(&cmd->se_dev->simple_cmds); |
c66ac9db NB |
2026 | smp_mb__after_atomic_inc(); |
2027 | } | |
2028 | /* | |
2029 | * Otherwise if one or more outstanding ORDERED task attribute exist, | |
2030 | * add the dormant task(s) built for the passed struct se_cmd to the | |
2031 | * execution queue and become in Active state for this struct se_device. | |
2032 | */ | |
5951146d | 2033 | if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) { |
c66ac9db NB |
2034 | /* |
2035 | * Otherwise, add cmd w/ tasks to delayed cmd queue that | |
25985edc | 2036 | * will be drained upon completion of HEAD_OF_QUEUE task. |
c66ac9db | 2037 | */ |
5951146d | 2038 | spin_lock(&cmd->se_dev->delayed_cmd_lock); |
c66ac9db | 2039 | cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR; |
5951146d AG |
2040 | list_add_tail(&cmd->se_delayed_node, |
2041 | &cmd->se_dev->delayed_cmd_list); | |
2042 | spin_unlock(&cmd->se_dev->delayed_cmd_lock); | |
c66ac9db | 2043 | |
6708bb27 | 2044 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" |
c66ac9db | 2045 | " delayed CMD list, se_ordered_id: %u\n", |
a1d8b49a | 2046 | cmd->t_task_cdb[0], cmd->sam_task_attr, |
c66ac9db NB |
2047 | cmd->se_ordered_id); |
2048 | /* | |
2049 | * Return zero to let transport_execute_tasks() know | |
2050 | * not to add the delayed tasks to the execution list. | |
2051 | */ | |
2052 | return 0; | |
2053 | } | |
2054 | /* | |
2055 | * Otherwise, no ORDERED task attributes exist.. | |
2056 | */ | |
2057 | return 1; | |
2058 | } | |
2059 | ||
2060 | /* | |
2061 | * Called from fabric module context in transport_generic_new_cmd() and | |
2062 | * transport_generic_process_write() | |
2063 | */ | |
2064 | static int transport_execute_tasks(struct se_cmd *cmd) | |
2065 | { | |
2066 | int add_tasks; | |
40be67f4 | 2067 | struct se_device *se_dev = cmd->se_dev; |
c66ac9db NB |
2068 | /* |
2069 | * Call transport_cmd_check_stop() to see if a fabric exception | |
25985edc | 2070 | * has occurred that prevents execution. |
c66ac9db | 2071 | */ |
6708bb27 | 2072 | if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) { |
c66ac9db NB |
2073 | /* |
2074 | * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE | |
2075 | * attribute for the tasks of the received struct se_cmd CDB | |
2076 | */ | |
2077 | add_tasks = transport_execute_task_attr(cmd); | |
e3d6f909 | 2078 | if (!add_tasks) |
c66ac9db NB |
2079 | goto execute_tasks; |
2080 | /* | |
4d2300cc NB |
2081 | * __transport_execute_tasks() -> __transport_add_tasks_from_cmd() |
2082 | * adds associated se_tasks while holding dev->execute_task_lock | |
2083 | * before I/O dispath to avoid a double spinlock access. | |
c66ac9db | 2084 | */ |
4d2300cc NB |
2085 | __transport_execute_tasks(se_dev, cmd); |
2086 | return 0; | |
c66ac9db | 2087 | } |
4d2300cc | 2088 | |
c66ac9db | 2089 | execute_tasks: |
4d2300cc | 2090 | __transport_execute_tasks(se_dev, NULL); |
c66ac9db NB |
2091 | return 0; |
2092 | } | |
2093 | ||
2094 | /* | |
2095 | * Called to check struct se_device tcq depth window, and once open pull struct se_task | |
2096 | * from struct se_device->execute_task_list and | |
2097 | * | |
2098 | * Called from transport_processing_thread() | |
2099 | */ | |
4d2300cc | 2100 | static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd) |
c66ac9db NB |
2101 | { |
2102 | int error; | |
2103 | struct se_cmd *cmd = NULL; | |
e3d6f909 | 2104 | struct se_task *task = NULL; |
c66ac9db NB |
2105 | unsigned long flags; |
2106 | ||
c66ac9db | 2107 | check_depth: |
e3d6f909 | 2108 | spin_lock_irq(&dev->execute_task_lock); |
4d2300cc NB |
2109 | if (new_cmd != NULL) |
2110 | __transport_add_tasks_from_cmd(new_cmd); | |
2111 | ||
e3d6f909 AG |
2112 | if (list_empty(&dev->execute_task_list)) { |
2113 | spin_unlock_irq(&dev->execute_task_lock); | |
c66ac9db NB |
2114 | return 0; |
2115 | } | |
e3d6f909 AG |
2116 | task = list_first_entry(&dev->execute_task_list, |
2117 | struct se_task, t_execute_list); | |
04629b7b | 2118 | __transport_remove_task_from_execute_queue(task, dev); |
e3d6f909 | 2119 | spin_unlock_irq(&dev->execute_task_lock); |
c66ac9db | 2120 | |
e3d6f909 | 2121 | cmd = task->task_se_cmd; |
a1d8b49a | 2122 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 2123 | task->task_flags |= (TF_ACTIVE | TF_SENT); |
a1d8b49a | 2124 | atomic_inc(&cmd->t_task_cdbs_sent); |
c66ac9db | 2125 | |
a1d8b49a AG |
2126 | if (atomic_read(&cmd->t_task_cdbs_sent) == |
2127 | cmd->t_task_list_num) | |
415a090a | 2128 | atomic_set(&cmd->t_transport_sent, 1); |
c66ac9db | 2129 | |
a1d8b49a | 2130 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2131 | |
5bda90c8 CH |
2132 | if (cmd->execute_task) |
2133 | error = cmd->execute_task(task); | |
2134 | else | |
2135 | error = dev->transport->do_task(task); | |
d29a5b6a | 2136 | if (error != 0) { |
d29a5b6a CH |
2137 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2138 | task->task_flags &= ~TF_ACTIVE; | |
2139 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2140 | atomic_set(&cmd->t_transport_sent, 0); | |
2141 | transport_stop_tasks_for_cmd(cmd); | |
03e98c9e | 2142 | transport_generic_request_failure(cmd); |
c66ac9db NB |
2143 | } |
2144 | ||
4d2300cc | 2145 | new_cmd = NULL; |
c66ac9db NB |
2146 | goto check_depth; |
2147 | ||
2148 | return 0; | |
2149 | } | |
2150 | ||
c66ac9db NB |
2151 | static inline u32 transport_get_sectors_6( |
2152 | unsigned char *cdb, | |
2153 | struct se_cmd *cmd, | |
2154 | int *ret) | |
2155 | { | |
5951146d | 2156 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2157 | |
2158 | /* | |
2159 | * Assume TYPE_DISK for non struct se_device objects. | |
2160 | * Use 8-bit sector value. | |
2161 | */ | |
2162 | if (!dev) | |
2163 | goto type_disk; | |
2164 | ||
2165 | /* | |
2166 | * Use 24-bit allocation length for TYPE_TAPE. | |
2167 | */ | |
e3d6f909 | 2168 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2169 | return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4]; |
2170 | ||
2171 | /* | |
2172 | * Everything else assume TYPE_DISK Sector CDB location. | |
9b5cd7f3 RD |
2173 | * Use 8-bit sector value. SBC-3 says: |
2174 | * | |
2175 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
2176 | * logical blocks shall be written. Any other value | |
2177 | * specifies the number of logical blocks that shall be | |
2178 | * written. | |
c66ac9db NB |
2179 | */ |
2180 | type_disk: | |
9b5cd7f3 | 2181 | return cdb[4] ? : 256; |
c66ac9db NB |
2182 | } |
2183 | ||
2184 | static inline u32 transport_get_sectors_10( | |
2185 | unsigned char *cdb, | |
2186 | struct se_cmd *cmd, | |
2187 | int *ret) | |
2188 | { | |
5951146d | 2189 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2190 | |
2191 | /* | |
2192 | * Assume TYPE_DISK for non struct se_device objects. | |
2193 | * Use 16-bit sector value. | |
2194 | */ | |
2195 | if (!dev) | |
2196 | goto type_disk; | |
2197 | ||
2198 | /* | |
2199 | * XXX_10 is not defined in SSC, throw an exception | |
2200 | */ | |
e3d6f909 AG |
2201 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2202 | *ret = -EINVAL; | |
c66ac9db NB |
2203 | return 0; |
2204 | } | |
2205 | ||
2206 | /* | |
2207 | * Everything else assume TYPE_DISK Sector CDB location. | |
2208 | * Use 16-bit sector value. | |
2209 | */ | |
2210 | type_disk: | |
2211 | return (u32)(cdb[7] << 8) + cdb[8]; | |
2212 | } | |
2213 | ||
2214 | static inline u32 transport_get_sectors_12( | |
2215 | unsigned char *cdb, | |
2216 | struct se_cmd *cmd, | |
2217 | int *ret) | |
2218 | { | |
5951146d | 2219 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2220 | |
2221 | /* | |
2222 | * Assume TYPE_DISK for non struct se_device objects. | |
2223 | * Use 32-bit sector value. | |
2224 | */ | |
2225 | if (!dev) | |
2226 | goto type_disk; | |
2227 | ||
2228 | /* | |
2229 | * XXX_12 is not defined in SSC, throw an exception | |
2230 | */ | |
e3d6f909 AG |
2231 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2232 | *ret = -EINVAL; | |
c66ac9db NB |
2233 | return 0; |
2234 | } | |
2235 | ||
2236 | /* | |
2237 | * Everything else assume TYPE_DISK Sector CDB location. | |
2238 | * Use 32-bit sector value. | |
2239 | */ | |
2240 | type_disk: | |
2241 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
2242 | } | |
2243 | ||
2244 | static inline u32 transport_get_sectors_16( | |
2245 | unsigned char *cdb, | |
2246 | struct se_cmd *cmd, | |
2247 | int *ret) | |
2248 | { | |
5951146d | 2249 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2250 | |
2251 | /* | |
2252 | * Assume TYPE_DISK for non struct se_device objects. | |
2253 | * Use 32-bit sector value. | |
2254 | */ | |
2255 | if (!dev) | |
2256 | goto type_disk; | |
2257 | ||
2258 | /* | |
2259 | * Use 24-bit allocation length for TYPE_TAPE. | |
2260 | */ | |
e3d6f909 | 2261 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2262 | return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14]; |
2263 | ||
2264 | type_disk: | |
2265 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
2266 | (cdb[12] << 8) + cdb[13]; | |
2267 | } | |
2268 | ||
2269 | /* | |
2270 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
2271 | */ | |
2272 | static inline u32 transport_get_sectors_32( | |
2273 | unsigned char *cdb, | |
2274 | struct se_cmd *cmd, | |
2275 | int *ret) | |
2276 | { | |
2277 | /* | |
2278 | * Assume TYPE_DISK for non struct se_device objects. | |
2279 | * Use 32-bit sector value. | |
2280 | */ | |
2281 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
2282 | (cdb[30] << 8) + cdb[31]; | |
2283 | ||
2284 | } | |
2285 | ||
2286 | static inline u32 transport_get_size( | |
2287 | u32 sectors, | |
2288 | unsigned char *cdb, | |
2289 | struct se_cmd *cmd) | |
2290 | { | |
5951146d | 2291 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 2292 | |
e3d6f909 | 2293 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
c66ac9db | 2294 | if (cdb[1] & 1) { /* sectors */ |
e3d6f909 | 2295 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2296 | } else /* bytes */ |
2297 | return sectors; | |
2298 | } | |
2299 | #if 0 | |
6708bb27 | 2300 | pr_debug("Returning block_size: %u, sectors: %u == %u for" |
e3d6f909 AG |
2301 | " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors, |
2302 | dev->se_sub_dev->se_dev_attrib.block_size * sectors, | |
2303 | dev->transport->name); | |
c66ac9db | 2304 | #endif |
e3d6f909 | 2305 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2306 | } |
2307 | ||
c66ac9db NB |
2308 | static void transport_xor_callback(struct se_cmd *cmd) |
2309 | { | |
2310 | unsigned char *buf, *addr; | |
ec98f782 | 2311 | struct scatterlist *sg; |
c66ac9db NB |
2312 | unsigned int offset; |
2313 | int i; | |
ec98f782 | 2314 | int count; |
c66ac9db NB |
2315 | /* |
2316 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
2317 | * | |
2318 | * 1) read the specified logical block(s); | |
2319 | * 2) transfer logical blocks from the data-out buffer; | |
2320 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
2321 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
2322 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
2323 | * blocks transferred from the data-out buffer; and | |
2324 | * 5) transfer the resulting XOR data to the data-in buffer. | |
2325 | */ | |
2326 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
6708bb27 AG |
2327 | if (!buf) { |
2328 | pr_err("Unable to allocate xor_callback buf\n"); | |
c66ac9db NB |
2329 | return; |
2330 | } | |
2331 | /* | |
ec98f782 | 2332 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
c66ac9db NB |
2333 | * into the locally allocated *buf |
2334 | */ | |
ec98f782 AG |
2335 | sg_copy_to_buffer(cmd->t_data_sg, |
2336 | cmd->t_data_nents, | |
2337 | buf, | |
2338 | cmd->data_length); | |
2339 | ||
c66ac9db NB |
2340 | /* |
2341 | * Now perform the XOR against the BIDI read memory located at | |
a1d8b49a | 2342 | * cmd->t_mem_bidi_list |
c66ac9db NB |
2343 | */ |
2344 | ||
2345 | offset = 0; | |
ec98f782 AG |
2346 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
2347 | addr = kmap_atomic(sg_page(sg), KM_USER0); | |
2348 | if (!addr) | |
c66ac9db NB |
2349 | goto out; |
2350 | ||
ec98f782 AG |
2351 | for (i = 0; i < sg->length; i++) |
2352 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
c66ac9db | 2353 | |
ec98f782 | 2354 | offset += sg->length; |
c66ac9db NB |
2355 | kunmap_atomic(addr, KM_USER0); |
2356 | } | |
ec98f782 | 2357 | |
c66ac9db NB |
2358 | out: |
2359 | kfree(buf); | |
2360 | } | |
2361 | ||
2362 | /* | |
2363 | * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd | |
2364 | */ | |
2365 | static int transport_get_sense_data(struct se_cmd *cmd) | |
2366 | { | |
2367 | unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; | |
42bf829e | 2368 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2369 | struct se_task *task = NULL, *task_tmp; |
2370 | unsigned long flags; | |
2371 | u32 offset = 0; | |
2372 | ||
e3d6f909 AG |
2373 | WARN_ON(!cmd->se_lun); |
2374 | ||
42bf829e CH |
2375 | if (!dev) |
2376 | return 0; | |
2377 | ||
a1d8b49a | 2378 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2379 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2380 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2381 | return 0; |
2382 | } | |
2383 | ||
2384 | list_for_each_entry_safe(task, task_tmp, | |
a1d8b49a | 2385 | &cmd->t_task_list, t_list) { |
ef804a84 | 2386 | if (!(task->task_flags & TF_HAS_SENSE)) |
c66ac9db NB |
2387 | continue; |
2388 | ||
e3d6f909 | 2389 | if (!dev->transport->get_sense_buffer) { |
6708bb27 | 2390 | pr_err("dev->transport->get_sense_buffer" |
c66ac9db NB |
2391 | " is NULL\n"); |
2392 | continue; | |
2393 | } | |
2394 | ||
e3d6f909 | 2395 | sense_buffer = dev->transport->get_sense_buffer(task); |
6708bb27 | 2396 | if (!sense_buffer) { |
04629b7b | 2397 | pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate" |
c66ac9db | 2398 | " sense buffer for task with sense\n", |
04629b7b | 2399 | cmd->se_tfo->get_task_tag(cmd), task); |
c66ac9db NB |
2400 | continue; |
2401 | } | |
a1d8b49a | 2402 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2403 | |
e3d6f909 | 2404 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
2405 | TRANSPORT_SENSE_BUFFER); |
2406 | ||
5951146d | 2407 | memcpy(&buffer[offset], sense_buffer, |
c66ac9db NB |
2408 | TRANSPORT_SENSE_BUFFER); |
2409 | cmd->scsi_status = task->task_scsi_status; | |
2410 | /* Automatically padded */ | |
2411 | cmd->scsi_sense_length = | |
2412 | (TRANSPORT_SENSE_BUFFER + offset); | |
2413 | ||
6708bb27 | 2414 | pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x" |
c66ac9db | 2415 | " and sense\n", |
e3d6f909 | 2416 | dev->se_hba->hba_id, dev->transport->name, |
c66ac9db NB |
2417 | cmd->scsi_status); |
2418 | return 0; | |
2419 | } | |
a1d8b49a | 2420 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2421 | |
2422 | return -1; | |
2423 | } | |
2424 | ||
ec98f782 AG |
2425 | static inline long long transport_dev_end_lba(struct se_device *dev) |
2426 | { | |
2427 | return dev->transport->get_blocks(dev) + 1; | |
2428 | } | |
2429 | ||
2430 | static int transport_cmd_get_valid_sectors(struct se_cmd *cmd) | |
2431 | { | |
2432 | struct se_device *dev = cmd->se_dev; | |
2433 | u32 sectors; | |
2434 | ||
2435 | if (dev->transport->get_device_type(dev) != TYPE_DISK) | |
2436 | return 0; | |
2437 | ||
2438 | sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size); | |
2439 | ||
6708bb27 AG |
2440 | if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) { |
2441 | pr_err("LBA: %llu Sectors: %u exceeds" | |
ec98f782 AG |
2442 | " transport_dev_end_lba(): %llu\n", |
2443 | cmd->t_task_lba, sectors, | |
2444 | transport_dev_end_lba(dev)); | |
7abbe7f3 | 2445 | return -EINVAL; |
ec98f782 AG |
2446 | } |
2447 | ||
7abbe7f3 | 2448 | return 0; |
ec98f782 AG |
2449 | } |
2450 | ||
706d5860 NB |
2451 | static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev) |
2452 | { | |
2453 | /* | |
2454 | * Determine if the received WRITE_SAME is used to for direct | |
2455 | * passthrough into Linux/SCSI with struct request via TCM/pSCSI | |
2456 | * or we are signaling the use of internal WRITE_SAME + UNMAP=1 | |
2457 | * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code. | |
2458 | */ | |
2459 | int passthrough = (dev->transport->transport_type == | |
2460 | TRANSPORT_PLUGIN_PHBA_PDEV); | |
2461 | ||
2462 | if (!passthrough) { | |
2463 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { | |
2464 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
2465 | " bits not supported for Block Discard" | |
2466 | " Emulation\n"); | |
2467 | return -ENOSYS; | |
2468 | } | |
2469 | /* | |
2470 | * Currently for the emulated case we only accept | |
2471 | * tpws with the UNMAP=1 bit set. | |
2472 | */ | |
2473 | if (!(flags[0] & 0x08)) { | |
2474 | pr_err("WRITE_SAME w/o UNMAP bit not" | |
2475 | " supported for Block Discard Emulation\n"); | |
2476 | return -ENOSYS; | |
2477 | } | |
2478 | } | |
2479 | ||
2480 | return 0; | |
2481 | } | |
2482 | ||
c66ac9db NB |
2483 | /* transport_generic_cmd_sequencer(): |
2484 | * | |
2485 | * Generic Command Sequencer that should work for most DAS transport | |
2486 | * drivers. | |
2487 | * | |
2488 | * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD | |
2489 | * RX Thread. | |
2490 | * | |
2491 | * FIXME: Need to support other SCSI OPCODES where as well. | |
2492 | */ | |
2493 | static int transport_generic_cmd_sequencer( | |
2494 | struct se_cmd *cmd, | |
2495 | unsigned char *cdb) | |
2496 | { | |
5951146d | 2497 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2498 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
2499 | int ret = 0, sector_ret = 0, passthrough; | |
2500 | u32 sectors = 0, size = 0, pr_reg_type = 0; | |
2501 | u16 service_action; | |
2502 | u8 alua_ascq = 0; | |
2503 | /* | |
2504 | * Check for an existing UNIT ATTENTION condition | |
2505 | */ | |
2506 | if (core_scsi3_ua_check(cmd, cdb) < 0) { | |
c66ac9db NB |
2507 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
2508 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; | |
5951146d | 2509 | return -EINVAL; |
c66ac9db NB |
2510 | } |
2511 | /* | |
2512 | * Check status of Asymmetric Logical Unit Assignment port | |
2513 | */ | |
e3d6f909 | 2514 | ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq); |
c66ac9db | 2515 | if (ret != 0) { |
c66ac9db | 2516 | /* |
25985edc | 2517 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; |
c66ac9db NB |
2518 | * The ALUA additional sense code qualifier (ASCQ) is determined |
2519 | * by the ALUA primary or secondary access state.. | |
2520 | */ | |
2521 | if (ret > 0) { | |
2522 | #if 0 | |
6708bb27 | 2523 | pr_debug("[%s]: ALUA TG Port not available," |
c66ac9db | 2524 | " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n", |
e3d6f909 | 2525 | cmd->se_tfo->get_fabric_name(), alua_ascq); |
c66ac9db NB |
2526 | #endif |
2527 | transport_set_sense_codes(cmd, 0x04, alua_ascq); | |
2528 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2529 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; | |
5951146d | 2530 | return -EINVAL; |
c66ac9db NB |
2531 | } |
2532 | goto out_invalid_cdb_field; | |
2533 | } | |
2534 | /* | |
2535 | * Check status for SPC-3 Persistent Reservations | |
2536 | */ | |
e3d6f909 AG |
2537 | if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) { |
2538 | if (su_dev->t10_pr.pr_ops.t10_seq_non_holder( | |
03e98c9e NB |
2539 | cmd, cdb, pr_reg_type) != 0) { |
2540 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2541 | cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; | |
2542 | cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; | |
2543 | return -EBUSY; | |
2544 | } | |
c66ac9db NB |
2545 | /* |
2546 | * This means the CDB is allowed for the SCSI Initiator port | |
2547 | * when said port is *NOT* holding the legacy SPC-2 or | |
2548 | * SPC-3 Persistent Reservation. | |
2549 | */ | |
2550 | } | |
2551 | ||
5bda90c8 CH |
2552 | /* |
2553 | * If we operate in passthrough mode we skip most CDB emulation and | |
2554 | * instead hand the commands down to the physical SCSI device. | |
2555 | */ | |
2556 | passthrough = | |
2557 | (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV); | |
2558 | ||
c66ac9db NB |
2559 | switch (cdb[0]) { |
2560 | case READ_6: | |
2561 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2562 | if (sector_ret) | |
2563 | goto out_unsupported_cdb; | |
2564 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2565 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2566 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2567 | break; | |
2568 | case READ_10: | |
2569 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2570 | if (sector_ret) | |
2571 | goto out_unsupported_cdb; | |
2572 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2573 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2574 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2575 | break; | |
2576 | case READ_12: | |
2577 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2578 | if (sector_ret) | |
2579 | goto out_unsupported_cdb; | |
2580 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2581 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2582 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2583 | break; | |
2584 | case READ_16: | |
2585 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2586 | if (sector_ret) | |
2587 | goto out_unsupported_cdb; | |
2588 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2589 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
2590 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2591 | break; | |
2592 | case WRITE_6: | |
2593 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2594 | if (sector_ret) | |
2595 | goto out_unsupported_cdb; | |
2596 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2597 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2598 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2599 | break; | |
2600 | case WRITE_10: | |
2601 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2602 | if (sector_ret) | |
2603 | goto out_unsupported_cdb; | |
2604 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2605 | cmd->t_task_lba = transport_lba_32(cdb); |
2d3a4b51 CH |
2606 | if (cdb[1] & 0x8) |
2607 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2608 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2609 | break; | |
2610 | case WRITE_12: | |
2611 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2612 | if (sector_ret) | |
2613 | goto out_unsupported_cdb; | |
2614 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2615 | cmd->t_task_lba = transport_lba_32(cdb); |
2d3a4b51 CH |
2616 | if (cdb[1] & 0x8) |
2617 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2618 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2619 | break; | |
2620 | case WRITE_16: | |
2621 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2622 | if (sector_ret) | |
2623 | goto out_unsupported_cdb; | |
2624 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2625 | cmd->t_task_lba = transport_lba_64(cdb); |
2d3a4b51 CH |
2626 | if (cdb[1] & 0x8) |
2627 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2628 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2629 | break; | |
2630 | case XDWRITEREAD_10: | |
2631 | if ((cmd->data_direction != DMA_TO_DEVICE) || | |
33c3fafc | 2632 | !(cmd->se_cmd_flags & SCF_BIDI)) |
c66ac9db NB |
2633 | goto out_invalid_cdb_field; |
2634 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2635 | if (sector_ret) | |
2636 | goto out_unsupported_cdb; | |
2637 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2638 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db | 2639 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
7c1c6af3 | 2640 | |
5bda90c8 CH |
2641 | /* |
2642 | * Do now allow BIDI commands for passthrough mode. | |
2643 | */ | |
2644 | if (passthrough) | |
7c1c6af3 | 2645 | goto out_unsupported_cdb; |
5bda90c8 | 2646 | |
c66ac9db | 2647 | /* |
35e0e757 | 2648 | * Setup BIDI XOR callback to be run after I/O completion. |
c66ac9db NB |
2649 | */ |
2650 | cmd->transport_complete_callback = &transport_xor_callback; | |
2d3a4b51 CH |
2651 | if (cdb[1] & 0x8) |
2652 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2653 | break; |
2654 | case VARIABLE_LENGTH_CMD: | |
2655 | service_action = get_unaligned_be16(&cdb[8]); | |
c66ac9db NB |
2656 | switch (service_action) { |
2657 | case XDWRITEREAD_32: | |
2658 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2659 | if (sector_ret) | |
2660 | goto out_unsupported_cdb; | |
2661 | size = transport_get_size(sectors, cdb, cmd); | |
2662 | /* | |
2663 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
2664 | * XDWRITE_READ_32 logic. | |
2665 | */ | |
a1d8b49a | 2666 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
c66ac9db NB |
2667 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2668 | ||
5bda90c8 CH |
2669 | /* |
2670 | * Do now allow BIDI commands for passthrough mode. | |
2671 | */ | |
c66ac9db | 2672 | if (passthrough) |
7c1c6af3 | 2673 | goto out_unsupported_cdb; |
5bda90c8 | 2674 | |
c66ac9db | 2675 | /* |
35e0e757 CH |
2676 | * Setup BIDI XOR callback to be run during after I/O |
2677 | * completion. | |
c66ac9db NB |
2678 | */ |
2679 | cmd->transport_complete_callback = &transport_xor_callback; | |
2d3a4b51 CH |
2680 | if (cdb[1] & 0x8) |
2681 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2682 | break; |
2683 | case WRITE_SAME_32: | |
2684 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2685 | if (sector_ret) | |
2686 | goto out_unsupported_cdb; | |
dd3a5ad8 | 2687 | |
6708bb27 | 2688 | if (sectors) |
12850626 | 2689 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
2690 | else { |
2691 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
2692 | " supported\n"); | |
2693 | goto out_invalid_cdb_field; | |
2694 | } | |
dd3a5ad8 | 2695 | |
a1d8b49a | 2696 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
c66ac9db NB |
2697 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
2698 | ||
706d5860 | 2699 | if (target_check_write_same_discard(&cdb[10], dev) < 0) |
c66ac9db | 2700 | goto out_invalid_cdb_field; |
5bda90c8 CH |
2701 | if (!passthrough) |
2702 | cmd->execute_task = target_emulate_write_same; | |
c66ac9db NB |
2703 | break; |
2704 | default: | |
6708bb27 | 2705 | pr_err("VARIABLE_LENGTH_CMD service action" |
c66ac9db NB |
2706 | " 0x%04x not supported\n", service_action); |
2707 | goto out_unsupported_cdb; | |
2708 | } | |
2709 | break; | |
e434f1f1 | 2710 | case MAINTENANCE_IN: |
e3d6f909 | 2711 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
2712 | /* MAINTENANCE_IN from SCC-2 */ |
2713 | /* | |
2714 | * Check for emulated MI_REPORT_TARGET_PGS. | |
2715 | */ | |
e76a35d6 CH |
2716 | if (cdb[1] == MI_REPORT_TARGET_PGS && |
2717 | su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) { | |
2718 | cmd->execute_task = | |
2719 | target_emulate_report_target_port_groups; | |
c66ac9db NB |
2720 | } |
2721 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
2722 | (cdb[8] << 8) | cdb[9]; | |
2723 | } else { | |
2724 | /* GPCMD_SEND_KEY from multi media commands */ | |
2725 | size = (cdb[8] << 8) + cdb[9]; | |
2726 | } | |
05d1c7c0 | 2727 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2728 | break; |
2729 | case MODE_SELECT: | |
2730 | size = cdb[4]; | |
2731 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2732 | break; | |
2733 | case MODE_SELECT_10: | |
2734 | size = (cdb[7] << 8) + cdb[8]; | |
2735 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2736 | break; | |
2737 | case MODE_SENSE: | |
2738 | size = cdb[4]; | |
05d1c7c0 | 2739 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2740 | if (!passthrough) |
2741 | cmd->execute_task = target_emulate_modesense; | |
c66ac9db NB |
2742 | break; |
2743 | case MODE_SENSE_10: | |
5bda90c8 CH |
2744 | size = (cdb[7] << 8) + cdb[8]; |
2745 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2746 | if (!passthrough) | |
2747 | cmd->execute_task = target_emulate_modesense; | |
2748 | break; | |
c66ac9db NB |
2749 | case GPCMD_READ_BUFFER_CAPACITY: |
2750 | case GPCMD_SEND_OPC: | |
2751 | case LOG_SELECT: | |
2752 | case LOG_SENSE: | |
2753 | size = (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2754 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2755 | break; |
2756 | case READ_BLOCK_LIMITS: | |
2757 | size = READ_BLOCK_LEN; | |
05d1c7c0 | 2758 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2759 | break; |
2760 | case GPCMD_GET_CONFIGURATION: | |
2761 | case GPCMD_READ_FORMAT_CAPACITIES: | |
2762 | case GPCMD_READ_DISC_INFO: | |
2763 | case GPCMD_READ_TRACK_RZONE_INFO: | |
2764 | size = (cdb[7] << 8) + cdb[8]; | |
2765 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2766 | break; | |
2767 | case PERSISTENT_RESERVE_IN: | |
617c0e06 | 2768 | if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) |
e76a35d6 | 2769 | cmd->execute_task = target_scsi3_emulate_pr_in; |
617c0e06 CH |
2770 | size = (cdb[7] << 8) + cdb[8]; |
2771 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2772 | break; | |
c66ac9db | 2773 | case PERSISTENT_RESERVE_OUT: |
617c0e06 | 2774 | if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) |
e76a35d6 | 2775 | cmd->execute_task = target_scsi3_emulate_pr_out; |
c66ac9db | 2776 | size = (cdb[7] << 8) + cdb[8]; |
05d1c7c0 | 2777 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2778 | break; |
2779 | case GPCMD_MECHANISM_STATUS: | |
2780 | case GPCMD_READ_DVD_STRUCTURE: | |
2781 | size = (cdb[8] << 8) + cdb[9]; | |
2782 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2783 | break; | |
2784 | case READ_POSITION: | |
2785 | size = READ_POSITION_LEN; | |
05d1c7c0 | 2786 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db | 2787 | break; |
e434f1f1 | 2788 | case MAINTENANCE_OUT: |
e3d6f909 | 2789 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
2790 | /* MAINTENANCE_OUT from SCC-2 |
2791 | * | |
2792 | * Check for emulated MO_SET_TARGET_PGS. | |
2793 | */ | |
e76a35d6 CH |
2794 | if (cdb[1] == MO_SET_TARGET_PGS && |
2795 | su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) { | |
2796 | cmd->execute_task = | |
2797 | target_emulate_set_target_port_groups; | |
c66ac9db NB |
2798 | } |
2799 | ||
2800 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
2801 | (cdb[8] << 8) | cdb[9]; | |
2802 | } else { | |
2803 | /* GPCMD_REPORT_KEY from multi media commands */ | |
2804 | size = (cdb[8] << 8) + cdb[9]; | |
2805 | } | |
05d1c7c0 | 2806 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2807 | break; |
2808 | case INQUIRY: | |
2809 | size = (cdb[3] << 8) + cdb[4]; | |
2810 | /* | |
2811 | * Do implict HEAD_OF_QUEUE processing for INQUIRY. | |
2812 | * See spc4r17 section 5.3 | |
2813 | */ | |
5951146d | 2814 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 2815 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 2816 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2817 | if (!passthrough) |
2818 | cmd->execute_task = target_emulate_inquiry; | |
c66ac9db NB |
2819 | break; |
2820 | case READ_BUFFER: | |
2821 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2822 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2823 | break; |
2824 | case READ_CAPACITY: | |
2825 | size = READ_CAP_LEN; | |
05d1c7c0 | 2826 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2827 | if (!passthrough) |
2828 | cmd->execute_task = target_emulate_readcapacity; | |
c66ac9db NB |
2829 | break; |
2830 | case READ_MEDIA_SERIAL_NUMBER: | |
2831 | case SECURITY_PROTOCOL_IN: | |
2832 | case SECURITY_PROTOCOL_OUT: | |
2833 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
05d1c7c0 | 2834 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2835 | break; |
2836 | case SERVICE_ACTION_IN: | |
5bda90c8 CH |
2837 | switch (cmd->t_task_cdb[1] & 0x1f) { |
2838 | case SAI_READ_CAPACITY_16: | |
2839 | if (!passthrough) | |
2840 | cmd->execute_task = | |
2841 | target_emulate_readcapacity_16; | |
2842 | break; | |
2843 | default: | |
2844 | if (passthrough) | |
2845 | break; | |
2846 | ||
2847 | pr_err("Unsupported SA: 0x%02x\n", | |
2848 | cmd->t_task_cdb[1] & 0x1f); | |
2849 | goto out_unsupported_cdb; | |
2850 | } | |
2851 | /*FALLTHROUGH*/ | |
c66ac9db NB |
2852 | case ACCESS_CONTROL_IN: |
2853 | case ACCESS_CONTROL_OUT: | |
2854 | case EXTENDED_COPY: | |
2855 | case READ_ATTRIBUTE: | |
2856 | case RECEIVE_COPY_RESULTS: | |
2857 | case WRITE_ATTRIBUTE: | |
2858 | size = (cdb[10] << 24) | (cdb[11] << 16) | | |
2859 | (cdb[12] << 8) | cdb[13]; | |
05d1c7c0 | 2860 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2861 | break; |
2862 | case RECEIVE_DIAGNOSTIC: | |
2863 | case SEND_DIAGNOSTIC: | |
2864 | size = (cdb[3] << 8) | cdb[4]; | |
05d1c7c0 | 2865 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2866 | break; |
2867 | /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */ | |
2868 | #if 0 | |
2869 | case GPCMD_READ_CD: | |
2870 | sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
2871 | size = (2336 * sectors); | |
05d1c7c0 | 2872 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2873 | break; |
2874 | #endif | |
2875 | case READ_TOC: | |
2876 | size = cdb[8]; | |
05d1c7c0 | 2877 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2878 | break; |
2879 | case REQUEST_SENSE: | |
2880 | size = cdb[4]; | |
05d1c7c0 | 2881 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2882 | if (!passthrough) |
2883 | cmd->execute_task = target_emulate_request_sense; | |
c66ac9db NB |
2884 | break; |
2885 | case READ_ELEMENT_STATUS: | |
2886 | size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9]; | |
05d1c7c0 | 2887 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2888 | break; |
2889 | case WRITE_BUFFER: | |
2890 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2891 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2892 | break; |
2893 | case RESERVE: | |
2894 | case RESERVE_10: | |
2895 | /* | |
2896 | * The SPC-2 RESERVE does not contain a size in the SCSI CDB. | |
2897 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
2898 | */ | |
2899 | if (cdb[0] == RESERVE_10) | |
2900 | size = (cdb[7] << 8) | cdb[8]; | |
2901 | else | |
2902 | size = cmd->data_length; | |
2903 | ||
2904 | /* | |
2905 | * Setup the legacy emulated handler for SPC-2 and | |
2906 | * >= SPC-3 compatible reservation handling (CRH=1) | |
2907 | * Otherwise, we assume the underlying SCSI logic is | |
2908 | * is running in SPC_PASSTHROUGH, and wants reservations | |
2909 | * emulation disabled. | |
2910 | */ | |
e76a35d6 CH |
2911 | if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) |
2912 | cmd->execute_task = target_scsi2_reservation_reserve; | |
c66ac9db NB |
2913 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
2914 | break; | |
2915 | case RELEASE: | |
2916 | case RELEASE_10: | |
2917 | /* | |
2918 | * The SPC-2 RELEASE does not contain a size in the SCSI CDB. | |
2919 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
2920 | */ | |
2921 | if (cdb[0] == RELEASE_10) | |
2922 | size = (cdb[7] << 8) | cdb[8]; | |
2923 | else | |
2924 | size = cmd->data_length; | |
2925 | ||
e76a35d6 CH |
2926 | if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) |
2927 | cmd->execute_task = target_scsi2_reservation_release; | |
c66ac9db NB |
2928 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
2929 | break; | |
2930 | case SYNCHRONIZE_CACHE: | |
2931 | case 0x91: /* SYNCHRONIZE_CACHE_16: */ | |
2932 | /* | |
2933 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
2934 | */ | |
2935 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
2936 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
a1d8b49a | 2937 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2938 | } else { |
2939 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
a1d8b49a | 2940 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
2941 | } |
2942 | if (sector_ret) | |
2943 | goto out_unsupported_cdb; | |
2944 | ||
2945 | size = transport_get_size(sectors, cdb, cmd); | |
2946 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
2947 | ||
5bda90c8 | 2948 | if (passthrough) |
c66ac9db | 2949 | break; |
5bda90c8 | 2950 | |
c66ac9db NB |
2951 | /* |
2952 | * Check to ensure that LBA + Range does not exceed past end of | |
7abbe7f3 | 2953 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls |
c66ac9db | 2954 | */ |
7abbe7f3 NB |
2955 | if ((cmd->t_task_lba != 0) || (sectors != 0)) { |
2956 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
2957 | goto out_invalid_cdb_field; | |
2958 | } | |
5bda90c8 | 2959 | cmd->execute_task = target_emulate_synchronize_cache; |
c66ac9db NB |
2960 | break; |
2961 | case UNMAP: | |
2962 | size = get_unaligned_be16(&cdb[7]); | |
05d1c7c0 | 2963 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2964 | if (!passthrough) |
2965 | cmd->execute_task = target_emulate_unmap; | |
c66ac9db NB |
2966 | break; |
2967 | case WRITE_SAME_16: | |
2968 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2969 | if (sector_ret) | |
2970 | goto out_unsupported_cdb; | |
dd3a5ad8 | 2971 | |
6708bb27 | 2972 | if (sectors) |
12850626 | 2973 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
2974 | else { |
2975 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
2976 | goto out_invalid_cdb_field; | |
2977 | } | |
dd3a5ad8 | 2978 | |
5db0753b | 2979 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
706d5860 NB |
2980 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
2981 | ||
2982 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
2983 | goto out_invalid_cdb_field; | |
5bda90c8 CH |
2984 | if (!passthrough) |
2985 | cmd->execute_task = target_emulate_write_same; | |
706d5860 NB |
2986 | break; |
2987 | case WRITE_SAME: | |
2988 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2989 | if (sector_ret) | |
2990 | goto out_unsupported_cdb; | |
2991 | ||
2992 | if (sectors) | |
12850626 | 2993 | size = transport_get_size(1, cdb, cmd); |
706d5860 NB |
2994 | else { |
2995 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
2996 | goto out_invalid_cdb_field; | |
c66ac9db | 2997 | } |
706d5860 NB |
2998 | |
2999 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); | |
c66ac9db | 3000 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
706d5860 NB |
3001 | /* |
3002 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
3003 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
3004 | */ | |
3005 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
3006 | goto out_invalid_cdb_field; | |
5bda90c8 CH |
3007 | if (!passthrough) |
3008 | cmd->execute_task = target_emulate_write_same; | |
c66ac9db NB |
3009 | break; |
3010 | case ALLOW_MEDIUM_REMOVAL: | |
c66ac9db | 3011 | case ERASE: |
c66ac9db NB |
3012 | case REZERO_UNIT: |
3013 | case SEEK_10: | |
c66ac9db NB |
3014 | case SPACE: |
3015 | case START_STOP: | |
3016 | case TEST_UNIT_READY: | |
3017 | case VERIFY: | |
3018 | case WRITE_FILEMARKS: | |
5bda90c8 CH |
3019 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
3020 | if (!passthrough) | |
3021 | cmd->execute_task = target_emulate_noop; | |
3022 | break; | |
3023 | case GPCMD_CLOSE_TRACK: | |
3024 | case INITIALIZE_ELEMENT_STATUS: | |
3025 | case GPCMD_LOAD_UNLOAD: | |
3026 | case GPCMD_SET_SPEED: | |
c66ac9db NB |
3027 | case MOVE_MEDIUM: |
3028 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
3029 | break; | |
3030 | case REPORT_LUNS: | |
e76a35d6 | 3031 | cmd->execute_task = target_report_luns; |
c66ac9db NB |
3032 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
3033 | /* | |
3034 | * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS | |
3035 | * See spc4r17 section 5.3 | |
3036 | */ | |
5951146d | 3037 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 3038 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 3039 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3040 | break; |
3041 | default: | |
6708bb27 | 3042 | pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode" |
c66ac9db | 3043 | " 0x%02x, sending CHECK_CONDITION.\n", |
e3d6f909 | 3044 | cmd->se_tfo->get_fabric_name(), cdb[0]); |
c66ac9db NB |
3045 | goto out_unsupported_cdb; |
3046 | } | |
3047 | ||
3048 | if (size != cmd->data_length) { | |
6708bb27 | 3049 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" |
c66ac9db | 3050 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" |
e3d6f909 | 3051 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), |
c66ac9db NB |
3052 | cmd->data_length, size, cdb[0]); |
3053 | ||
3054 | cmd->cmd_spdtl = size; | |
3055 | ||
3056 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
6708bb27 | 3057 | pr_err("Rejecting underflow/overflow" |
c66ac9db NB |
3058 | " WRITE data\n"); |
3059 | goto out_invalid_cdb_field; | |
3060 | } | |
3061 | /* | |
3062 | * Reject READ_* or WRITE_* with overflow/underflow for | |
3063 | * type SCF_SCSI_DATA_SG_IO_CDB. | |
3064 | */ | |
6708bb27 AG |
3065 | if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) { |
3066 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" | |
c66ac9db | 3067 | " CDB on non 512-byte sector setup subsystem" |
e3d6f909 | 3068 | " plugin: %s\n", dev->transport->name); |
c66ac9db NB |
3069 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ |
3070 | goto out_invalid_cdb_field; | |
3071 | } | |
3072 | ||
3073 | if (size > cmd->data_length) { | |
3074 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
3075 | cmd->residual_count = (size - cmd->data_length); | |
3076 | } else { | |
3077 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
3078 | cmd->residual_count = (cmd->data_length - size); | |
3079 | } | |
3080 | cmd->data_length = size; | |
3081 | } | |
3082 | ||
5bda90c8 CH |
3083 | /* reject any command that we don't have a handler for */ |
3084 | if (!(passthrough || cmd->execute_task || | |
3085 | (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))) | |
3086 | goto out_unsupported_cdb; | |
3087 | ||
c66ac9db NB |
3088 | transport_set_supported_SAM_opcode(cmd); |
3089 | return ret; | |
3090 | ||
3091 | out_unsupported_cdb: | |
3092 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3093 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
5951146d | 3094 | return -EINVAL; |
c66ac9db NB |
3095 | out_invalid_cdb_field: |
3096 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3097 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 3098 | return -EINVAL; |
c66ac9db NB |
3099 | } |
3100 | ||
c66ac9db | 3101 | /* |
35e0e757 | 3102 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
3103 | * and ordered cmds need to have their tasks added to the execution queue. |
3104 | */ | |
3105 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
3106 | { | |
5951146d | 3107 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
3108 | struct se_cmd *cmd_p, *cmd_tmp; |
3109 | int new_active_tasks = 0; | |
3110 | ||
e66ecd50 | 3111 | if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { |
c66ac9db NB |
3112 | atomic_dec(&dev->simple_cmds); |
3113 | smp_mb__after_atomic_dec(); | |
3114 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3115 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
3116 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
3117 | cmd->se_ordered_id); | |
e66ecd50 | 3118 | } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db | 3119 | dev->dev_cur_ordered_id++; |
6708bb27 | 3120 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
3121 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
3122 | cmd->se_ordered_id); | |
e66ecd50 | 3123 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
c66ac9db NB |
3124 | atomic_dec(&dev->dev_ordered_sync); |
3125 | smp_mb__after_atomic_dec(); | |
c66ac9db NB |
3126 | |
3127 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3128 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
3129 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
3130 | } | |
3131 | /* | |
3132 | * Process all commands up to the last received | |
3133 | * ORDERED task attribute which requires another blocking | |
3134 | * boundary | |
3135 | */ | |
3136 | spin_lock(&dev->delayed_cmd_lock); | |
3137 | list_for_each_entry_safe(cmd_p, cmd_tmp, | |
5951146d | 3138 | &dev->delayed_cmd_list, se_delayed_node) { |
c66ac9db | 3139 | |
5951146d | 3140 | list_del(&cmd_p->se_delayed_node); |
c66ac9db NB |
3141 | spin_unlock(&dev->delayed_cmd_lock); |
3142 | ||
6708bb27 | 3143 | pr_debug("Calling add_tasks() for" |
c66ac9db NB |
3144 | " cmd_p: 0x%02x Task Attr: 0x%02x" |
3145 | " Dormant -> Active, se_ordered_id: %u\n", | |
6708bb27 | 3146 | cmd_p->t_task_cdb[0], |
c66ac9db NB |
3147 | cmd_p->sam_task_attr, cmd_p->se_ordered_id); |
3148 | ||
3149 | transport_add_tasks_from_cmd(cmd_p); | |
3150 | new_active_tasks++; | |
3151 | ||
3152 | spin_lock(&dev->delayed_cmd_lock); | |
e66ecd50 | 3153 | if (cmd_p->sam_task_attr == MSG_ORDERED_TAG) |
c66ac9db NB |
3154 | break; |
3155 | } | |
3156 | spin_unlock(&dev->delayed_cmd_lock); | |
3157 | /* | |
3158 | * If new tasks have become active, wake up the transport thread | |
3159 | * to do the processing of the Active tasks. | |
3160 | */ | |
3161 | if (new_active_tasks != 0) | |
e3d6f909 | 3162 | wake_up_interruptible(&dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
3163 | } |
3164 | ||
e057f533 | 3165 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
3166 | { |
3167 | int ret = 0; | |
3168 | ||
e057f533 CH |
3169 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
3170 | transport_complete_task_attr(cmd); | |
3171 | ||
3172 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3173 | ret = cmd->se_tfo->queue_status(cmd); | |
3174 | if (ret) | |
3175 | goto out; | |
3176 | } | |
07bde79a NB |
3177 | |
3178 | switch (cmd->data_direction) { | |
3179 | case DMA_FROM_DEVICE: | |
3180 | ret = cmd->se_tfo->queue_data_in(cmd); | |
3181 | break; | |
3182 | case DMA_TO_DEVICE: | |
ec98f782 | 3183 | if (cmd->t_bidi_data_sg) { |
07bde79a NB |
3184 | ret = cmd->se_tfo->queue_data_in(cmd); |
3185 | if (ret < 0) | |
e057f533 | 3186 | break; |
07bde79a NB |
3187 | } |
3188 | /* Fall through for DMA_TO_DEVICE */ | |
3189 | case DMA_NONE: | |
3190 | ret = cmd->se_tfo->queue_status(cmd); | |
3191 | break; | |
3192 | default: | |
3193 | break; | |
3194 | } | |
3195 | ||
e057f533 CH |
3196 | out: |
3197 | if (ret < 0) { | |
3198 | transport_handle_queue_full(cmd, cmd->se_dev); | |
3199 | return; | |
3200 | } | |
3201 | transport_lun_remove_cmd(cmd); | |
3202 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3203 | } |
3204 | ||
3205 | static void transport_handle_queue_full( | |
3206 | struct se_cmd *cmd, | |
e057f533 | 3207 | struct se_device *dev) |
07bde79a NB |
3208 | { |
3209 | spin_lock_irq(&dev->qf_cmd_lock); | |
07bde79a NB |
3210 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
3211 | atomic_inc(&dev->dev_qf_count); | |
3212 | smp_mb__after_atomic_inc(); | |
3213 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); | |
3214 | ||
3215 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3216 | } | |
3217 | ||
35e0e757 | 3218 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 3219 | { |
35e0e757 | 3220 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
07bde79a | 3221 | int reason = 0, ret; |
35e0e757 | 3222 | |
c66ac9db NB |
3223 | /* |
3224 | * Check if we need to move delayed/dormant tasks from cmds on the | |
3225 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
3226 | * Attribute. | |
3227 | */ | |
5951146d | 3228 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
c66ac9db | 3229 | transport_complete_task_attr(cmd); |
07bde79a NB |
3230 | /* |
3231 | * Check to schedule QUEUE_FULL work, or execute an existing | |
3232 | * cmd->transport_qf_callback() | |
3233 | */ | |
3234 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
3235 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3236 | ||
c66ac9db NB |
3237 | /* |
3238 | * Check if we need to retrieve a sense buffer from | |
3239 | * the struct se_cmd in question. | |
3240 | */ | |
3241 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3242 | if (transport_get_sense_data(cmd) < 0) | |
3243 | reason = TCM_NON_EXISTENT_LUN; | |
3244 | ||
3245 | /* | |
3246 | * Only set when an struct se_task->task_scsi_status returned | |
3247 | * a non GOOD status. | |
3248 | */ | |
3249 | if (cmd->scsi_status) { | |
07bde79a | 3250 | ret = transport_send_check_condition_and_sense( |
c66ac9db | 3251 | cmd, reason, 1); |
f147abb4 | 3252 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a NB |
3253 | goto queue_full; |
3254 | ||
c66ac9db NB |
3255 | transport_lun_remove_cmd(cmd); |
3256 | transport_cmd_check_stop_to_fabric(cmd); | |
3257 | return; | |
3258 | } | |
3259 | } | |
3260 | /* | |
25985edc | 3261 | * Check for a callback, used by amongst other things |
c66ac9db NB |
3262 | * XDWRITE_READ_10 emulation. |
3263 | */ | |
3264 | if (cmd->transport_complete_callback) | |
3265 | cmd->transport_complete_callback(cmd); | |
3266 | ||
3267 | switch (cmd->data_direction) { | |
3268 | case DMA_FROM_DEVICE: | |
3269 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3270 | if (cmd->se_lun->lun_sep) { |
3271 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3272 | cmd->data_length; |
3273 | } | |
3274 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
c66ac9db | 3275 | |
07bde79a | 3276 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 3277 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3278 | goto queue_full; |
c66ac9db NB |
3279 | break; |
3280 | case DMA_TO_DEVICE: | |
3281 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3282 | if (cmd->se_lun->lun_sep) { |
3283 | cmd->se_lun->lun_sep->sep_stats.rx_data_octets += | |
c66ac9db NB |
3284 | cmd->data_length; |
3285 | } | |
3286 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
3287 | /* | |
3288 | * Check if we need to send READ payload for BIDI-COMMAND | |
3289 | */ | |
ec98f782 | 3290 | if (cmd->t_bidi_data_sg) { |
c66ac9db | 3291 | spin_lock(&cmd->se_lun->lun_sep_lock); |
e3d6f909 AG |
3292 | if (cmd->se_lun->lun_sep) { |
3293 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3294 | cmd->data_length; |
3295 | } | |
3296 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
07bde79a | 3297 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 3298 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3299 | goto queue_full; |
c66ac9db NB |
3300 | break; |
3301 | } | |
3302 | /* Fall through for DMA_TO_DEVICE */ | |
3303 | case DMA_NONE: | |
07bde79a | 3304 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 3305 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3306 | goto queue_full; |
c66ac9db NB |
3307 | break; |
3308 | default: | |
3309 | break; | |
3310 | } | |
3311 | ||
3312 | transport_lun_remove_cmd(cmd); | |
3313 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3314 | return; |
3315 | ||
3316 | queue_full: | |
6708bb27 | 3317 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 3318 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
3319 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
3320 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
3321 | } |
3322 | ||
3323 | static void transport_free_dev_tasks(struct se_cmd *cmd) | |
3324 | { | |
3325 | struct se_task *task, *task_tmp; | |
3326 | unsigned long flags; | |
0c2cfe5f | 3327 | LIST_HEAD(dispose_list); |
c66ac9db | 3328 | |
a1d8b49a | 3329 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3330 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 3331 | &cmd->t_task_list, t_list) { |
0c2cfe5f CH |
3332 | if (!(task->task_flags & TF_ACTIVE)) |
3333 | list_move_tail(&task->t_list, &dispose_list); | |
3334 | } | |
3335 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3336 | ||
3337 | while (!list_empty(&dispose_list)) { | |
3338 | task = list_first_entry(&dispose_list, struct se_task, t_list); | |
c66ac9db | 3339 | |
af3f00c7 CH |
3340 | if (task->task_sg != cmd->t_data_sg && |
3341 | task->task_sg != cmd->t_bidi_data_sg) | |
3342 | kfree(task->task_sg); | |
c66ac9db NB |
3343 | |
3344 | list_del(&task->t_list); | |
3345 | ||
42bf829e | 3346 | cmd->se_dev->transport->free_task(task); |
c66ac9db | 3347 | } |
c66ac9db NB |
3348 | } |
3349 | ||
6708bb27 | 3350 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 3351 | { |
ec98f782 | 3352 | struct scatterlist *sg; |
ec98f782 | 3353 | int count; |
c66ac9db | 3354 | |
6708bb27 AG |
3355 | for_each_sg(sgl, sg, nents, count) |
3356 | __free_page(sg_page(sg)); | |
c66ac9db | 3357 | |
6708bb27 AG |
3358 | kfree(sgl); |
3359 | } | |
c66ac9db | 3360 | |
6708bb27 AG |
3361 | static inline void transport_free_pages(struct se_cmd *cmd) |
3362 | { | |
3363 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) | |
3364 | return; | |
3365 | ||
3366 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
3367 | cmd->t_data_sg = NULL; |
3368 | cmd->t_data_nents = 0; | |
c66ac9db | 3369 | |
6708bb27 | 3370 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
3371 | cmd->t_bidi_data_sg = NULL; |
3372 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
3373 | } |
3374 | ||
e26d99ae CH |
3375 | /** |
3376 | * transport_release_cmd - free a command | |
3377 | * @cmd: command to free | |
3378 | * | |
3379 | * This routine unconditionally frees a command, and reference counting | |
3380 | * or list removal must be done in the caller. | |
3381 | */ | |
3382 | static void transport_release_cmd(struct se_cmd *cmd) | |
3383 | { | |
3384 | BUG_ON(!cmd->se_tfo); | |
3385 | ||
3386 | if (cmd->se_tmr_req) | |
3387 | core_tmr_release_req(cmd->se_tmr_req); | |
3388 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
3389 | kfree(cmd->t_task_cdb); | |
3390 | /* | |
7481deb4 NB |
3391 | * If this cmd has been setup with target_get_sess_cmd(), drop |
3392 | * the kref and call ->release_cmd() in kref callback. | |
e26d99ae | 3393 | */ |
7481deb4 NB |
3394 | if (cmd->check_release != 0) { |
3395 | target_put_sess_cmd(cmd->se_sess, cmd); | |
3396 | return; | |
3397 | } | |
e26d99ae CH |
3398 | cmd->se_tfo->release_cmd(cmd); |
3399 | } | |
3400 | ||
d3df7825 CH |
3401 | /** |
3402 | * transport_put_cmd - release a reference to a command | |
3403 | * @cmd: command to release | |
3404 | * | |
3405 | * This routine releases our reference to the command and frees it if possible. | |
3406 | */ | |
39c05f32 | 3407 | static void transport_put_cmd(struct se_cmd *cmd) |
c66ac9db NB |
3408 | { |
3409 | unsigned long flags; | |
4911e3cc | 3410 | int free_tasks = 0; |
c66ac9db | 3411 | |
a1d8b49a | 3412 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4911e3cc CH |
3413 | if (atomic_read(&cmd->t_fe_count)) { |
3414 | if (!atomic_dec_and_test(&cmd->t_fe_count)) | |
3415 | goto out_busy; | |
3416 | } | |
3417 | ||
3418 | if (atomic_read(&cmd->t_se_count)) { | |
3419 | if (!atomic_dec_and_test(&cmd->t_se_count)) | |
3420 | goto out_busy; | |
3421 | } | |
3422 | ||
3423 | if (atomic_read(&cmd->transport_dev_active)) { | |
3424 | atomic_set(&cmd->transport_dev_active, 0); | |
3425 | transport_all_task_dev_remove_state(cmd); | |
3426 | free_tasks = 1; | |
c66ac9db | 3427 | } |
a1d8b49a | 3428 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 3429 | |
4911e3cc CH |
3430 | if (free_tasks != 0) |
3431 | transport_free_dev_tasks(cmd); | |
d3df7825 | 3432 | |
c66ac9db | 3433 | transport_free_pages(cmd); |
31afc39c | 3434 | transport_release_cmd(cmd); |
39c05f32 | 3435 | return; |
4911e3cc CH |
3436 | out_busy: |
3437 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3438 | } |
3439 | ||
c66ac9db | 3440 | /* |
ec98f782 AG |
3441 | * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of |
3442 | * allocating in the core. | |
c66ac9db NB |
3443 | * @cmd: Associated se_cmd descriptor |
3444 | * @mem: SGL style memory for TCM WRITE / READ | |
3445 | * @sg_mem_num: Number of SGL elements | |
3446 | * @mem_bidi_in: SGL style memory for TCM BIDI READ | |
3447 | * @sg_mem_bidi_num: Number of BIDI READ SGL elements | |
3448 | * | |
3449 | * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage | |
3450 | * of parameters. | |
3451 | */ | |
3452 | int transport_generic_map_mem_to_cmd( | |
3453 | struct se_cmd *cmd, | |
5951146d AG |
3454 | struct scatterlist *sgl, |
3455 | u32 sgl_count, | |
3456 | struct scatterlist *sgl_bidi, | |
3457 | u32 sgl_bidi_count) | |
c66ac9db | 3458 | { |
5951146d | 3459 | if (!sgl || !sgl_count) |
c66ac9db | 3460 | return 0; |
c66ac9db | 3461 | |
c66ac9db NB |
3462 | if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) || |
3463 | (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) { | |
fef58a60 NB |
3464 | /* |
3465 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
3466 | * scatterlists already have been set to follow what the fabric | |
3467 | * passes for the original expected data transfer length. | |
3468 | */ | |
3469 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
3470 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
3471 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
3472 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3473 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
3474 | return -EINVAL; | |
3475 | } | |
c66ac9db | 3476 | |
ec98f782 AG |
3477 | cmd->t_data_sg = sgl; |
3478 | cmd->t_data_nents = sgl_count; | |
c66ac9db | 3479 | |
ec98f782 AG |
3480 | if (sgl_bidi && sgl_bidi_count) { |
3481 | cmd->t_bidi_data_sg = sgl_bidi; | |
3482 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
c66ac9db NB |
3483 | } |
3484 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
c66ac9db NB |
3485 | } |
3486 | ||
3487 | return 0; | |
3488 | } | |
3489 | EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); | |
3490 | ||
4949314c | 3491 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 3492 | { |
ec98f782 | 3493 | struct scatterlist *sg = cmd->t_data_sg; |
4949314c AG |
3494 | struct page **pages; |
3495 | int i; | |
05d1c7c0 | 3496 | |
ec98f782 | 3497 | BUG_ON(!sg); |
05d1c7c0 | 3498 | /* |
ec98f782 AG |
3499 | * We need to take into account a possible offset here for fabrics like |
3500 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
3501 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 3502 | */ |
4949314c AG |
3503 | if (!cmd->t_data_nents) |
3504 | return NULL; | |
3505 | else if (cmd->t_data_nents == 1) | |
3506 | return kmap(sg_page(sg)) + sg->offset; | |
3507 | ||
3508 | /* >1 page. use vmap */ | |
3509 | pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); | |
3510 | if (!pages) | |
3511 | return NULL; | |
3512 | ||
3513 | /* convert sg[] to pages[] */ | |
3514 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { | |
3515 | pages[i] = sg_page(sg); | |
3516 | } | |
3517 | ||
3518 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); | |
3519 | kfree(pages); | |
3520 | if (!cmd->t_data_vmap) | |
3521 | return NULL; | |
3522 | ||
3523 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; | |
05d1c7c0 | 3524 | } |
4949314c | 3525 | EXPORT_SYMBOL(transport_kmap_data_sg); |
05d1c7c0 | 3526 | |
4949314c | 3527 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 3528 | { |
4949314c AG |
3529 | if (!cmd->t_data_nents) |
3530 | return; | |
3531 | else if (cmd->t_data_nents == 1) | |
3532 | kunmap(sg_page(cmd->t_data_sg)); | |
3533 | ||
3534 | vunmap(cmd->t_data_vmap); | |
3535 | cmd->t_data_vmap = NULL; | |
05d1c7c0 | 3536 | } |
4949314c | 3537 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
05d1c7c0 | 3538 | |
c66ac9db | 3539 | static int |
05d1c7c0 | 3540 | transport_generic_get_mem(struct se_cmd *cmd) |
c66ac9db | 3541 | { |
ec98f782 AG |
3542 | u32 length = cmd->data_length; |
3543 | unsigned int nents; | |
3544 | struct page *page; | |
9db9da33 | 3545 | gfp_t zero_flag; |
ec98f782 | 3546 | int i = 0; |
c66ac9db | 3547 | |
ec98f782 AG |
3548 | nents = DIV_ROUND_UP(length, PAGE_SIZE); |
3549 | cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL); | |
3550 | if (!cmd->t_data_sg) | |
3551 | return -ENOMEM; | |
c66ac9db | 3552 | |
ec98f782 AG |
3553 | cmd->t_data_nents = nents; |
3554 | sg_init_table(cmd->t_data_sg, nents); | |
c66ac9db | 3555 | |
9db9da33 | 3556 | zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO; |
3557 | ||
ec98f782 AG |
3558 | while (length) { |
3559 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
9db9da33 | 3560 | page = alloc_page(GFP_KERNEL | zero_flag); |
ec98f782 AG |
3561 | if (!page) |
3562 | goto out; | |
c66ac9db | 3563 | |
ec98f782 AG |
3564 | sg_set_page(&cmd->t_data_sg[i], page, page_len, 0); |
3565 | length -= page_len; | |
3566 | i++; | |
c66ac9db | 3567 | } |
c66ac9db | 3568 | return 0; |
c66ac9db | 3569 | |
ec98f782 AG |
3570 | out: |
3571 | while (i >= 0) { | |
3572 | __free_page(sg_page(&cmd->t_data_sg[i])); | |
3573 | i--; | |
c66ac9db | 3574 | } |
ec98f782 AG |
3575 | kfree(cmd->t_data_sg); |
3576 | cmd->t_data_sg = NULL; | |
3577 | return -ENOMEM; | |
c66ac9db NB |
3578 | } |
3579 | ||
a1d8b49a AG |
3580 | /* Reduce sectors if they are too long for the device */ |
3581 | static inline sector_t transport_limit_task_sectors( | |
c66ac9db NB |
3582 | struct se_device *dev, |
3583 | unsigned long long lba, | |
a1d8b49a | 3584 | sector_t sectors) |
c66ac9db | 3585 | { |
a1d8b49a | 3586 | sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db | 3587 | |
a1d8b49a AG |
3588 | if (dev->transport->get_device_type(dev) == TYPE_DISK) |
3589 | if ((lba + sectors) > transport_dev_end_lba(dev)) | |
3590 | sectors = ((transport_dev_end_lba(dev) - lba) + 1); | |
c66ac9db | 3591 | |
a1d8b49a | 3592 | return sectors; |
c66ac9db NB |
3593 | } |
3594 | ||
c66ac9db NB |
3595 | |
3596 | /* | |
3597 | * This function can be used by HW target mode drivers to create a linked | |
3598 | * scatterlist from all contiguously allocated struct se_task->task_sg[]. | |
3599 | * This is intended to be called during the completion path by TCM Core | |
3600 | * when struct target_core_fabric_ops->check_task_sg_chaining is enabled. | |
3601 | */ | |
3602 | void transport_do_task_sg_chain(struct se_cmd *cmd) | |
3603 | { | |
ec98f782 AG |
3604 | struct scatterlist *sg_first = NULL; |
3605 | struct scatterlist *sg_prev = NULL; | |
3606 | int sg_prev_nents = 0; | |
3607 | struct scatterlist *sg; | |
c66ac9db | 3608 | struct se_task *task; |
ec98f782 | 3609 | u32 chained_nents = 0; |
c66ac9db NB |
3610 | int i; |
3611 | ||
ec98f782 AG |
3612 | BUG_ON(!cmd->se_tfo->task_sg_chaining); |
3613 | ||
c66ac9db NB |
3614 | /* |
3615 | * Walk the struct se_task list and setup scatterlist chains | |
a1d8b49a | 3616 | * for each contiguously allocated struct se_task->task_sg[]. |
c66ac9db | 3617 | */ |
a1d8b49a | 3618 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
ec98f782 | 3619 | if (!task->task_sg) |
c66ac9db NB |
3620 | continue; |
3621 | ||
ec98f782 AG |
3622 | if (!sg_first) { |
3623 | sg_first = task->task_sg; | |
6708bb27 | 3624 | chained_nents = task->task_sg_nents; |
97868c89 | 3625 | } else { |
ec98f782 | 3626 | sg_chain(sg_prev, sg_prev_nents, task->task_sg); |
6708bb27 | 3627 | chained_nents += task->task_sg_nents; |
97868c89 | 3628 | } |
c3c74c7a NB |
3629 | /* |
3630 | * For the padded tasks, use the extra SGL vector allocated | |
3631 | * in transport_allocate_data_tasks() for the sg_prev_nents | |
04629b7b CH |
3632 | * offset into sg_chain() above. |
3633 | * | |
3634 | * We do not need the padding for the last task (or a single | |
3635 | * task), but in that case we will never use the sg_prev_nents | |
3636 | * value below which would be incorrect. | |
c3c74c7a | 3637 | */ |
04629b7b | 3638 | sg_prev_nents = (task->task_sg_nents + 1); |
ec98f782 | 3639 | sg_prev = task->task_sg; |
c66ac9db NB |
3640 | } |
3641 | /* | |
3642 | * Setup the starting pointer and total t_tasks_sg_linked_no including | |
3643 | * padding SGs for linking and to mark the end. | |
3644 | */ | |
a1d8b49a | 3645 | cmd->t_tasks_sg_chained = sg_first; |
ec98f782 | 3646 | cmd->t_tasks_sg_chained_no = chained_nents; |
c66ac9db | 3647 | |
6708bb27 | 3648 | pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and" |
a1d8b49a AG |
3649 | " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained, |
3650 | cmd->t_tasks_sg_chained_no); | |
c66ac9db | 3651 | |
a1d8b49a AG |
3652 | for_each_sg(cmd->t_tasks_sg_chained, sg, |
3653 | cmd->t_tasks_sg_chained_no, i) { | |
c66ac9db | 3654 | |
6708bb27 | 3655 | pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n", |
5951146d | 3656 | i, sg, sg_page(sg), sg->length, sg->offset); |
c66ac9db | 3657 | if (sg_is_chain(sg)) |
6708bb27 | 3658 | pr_debug("SG: %p sg_is_chain=1\n", sg); |
c66ac9db | 3659 | if (sg_is_last(sg)) |
6708bb27 | 3660 | pr_debug("SG: %p sg_is_last=1\n", sg); |
c66ac9db | 3661 | } |
c66ac9db NB |
3662 | } |
3663 | EXPORT_SYMBOL(transport_do_task_sg_chain); | |
3664 | ||
a1d8b49a AG |
3665 | /* |
3666 | * Break up cmd into chunks transport can handle | |
3667 | */ | |
38b40067 CH |
3668 | static int |
3669 | transport_allocate_data_tasks(struct se_cmd *cmd, | |
c66ac9db | 3670 | enum dma_data_direction data_direction, |
38b40067 | 3671 | struct scatterlist *cmd_sg, unsigned int sgl_nents) |
c66ac9db | 3672 | { |
5951146d | 3673 | struct se_device *dev = cmd->se_dev; |
a3eedc22 | 3674 | int task_count, i; |
38b40067 CH |
3675 | unsigned long long lba; |
3676 | sector_t sectors, dev_max_sectors; | |
3677 | u32 sector_size; | |
3678 | ||
3679 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
3680 | return -EINVAL; | |
3681 | ||
3682 | dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors; | |
3683 | sector_size = dev->se_sub_dev->se_dev_attrib.block_size; | |
a1d8b49a | 3684 | |
ec98f782 | 3685 | WARN_ON(cmd->data_length % sector_size); |
38b40067 CH |
3686 | |
3687 | lba = cmd->t_task_lba; | |
ec98f782 | 3688 | sectors = DIV_ROUND_UP(cmd->data_length, sector_size); |
277c5f27 | 3689 | task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors); |
af3f00c7 CH |
3690 | |
3691 | /* | |
3692 | * If we need just a single task reuse the SG list in the command | |
3693 | * and avoid a lot of work. | |
3694 | */ | |
3695 | if (task_count == 1) { | |
3696 | struct se_task *task; | |
3697 | unsigned long flags; | |
3698 | ||
3699 | task = transport_generic_get_task(cmd, data_direction); | |
3700 | if (!task) | |
3701 | return -ENOMEM; | |
3702 | ||
3703 | task->task_sg = cmd_sg; | |
3704 | task->task_sg_nents = sgl_nents; | |
3705 | ||
3706 | task->task_lba = lba; | |
3707 | task->task_sectors = sectors; | |
3708 | task->task_size = task->task_sectors * sector_size; | |
3709 | ||
3710 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
3711 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3712 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3713 | ||
3714 | return task_count; | |
3715 | } | |
3716 | ||
ec98f782 | 3717 | for (i = 0; i < task_count; i++) { |
38b40067 | 3718 | struct se_task *task; |
c3c74c7a | 3719 | unsigned int task_size, task_sg_nents_padded; |
38b40067 CH |
3720 | struct scatterlist *sg; |
3721 | unsigned long flags; | |
ec98f782 | 3722 | int count; |
a1d8b49a | 3723 | |
c66ac9db | 3724 | task = transport_generic_get_task(cmd, data_direction); |
a1d8b49a | 3725 | if (!task) |
ec98f782 | 3726 | return -ENOMEM; |
c66ac9db | 3727 | |
c66ac9db | 3728 | task->task_lba = lba; |
ec98f782 AG |
3729 | task->task_sectors = min(sectors, dev_max_sectors); |
3730 | task->task_size = task->task_sectors * sector_size; | |
c66ac9db | 3731 | |
525a48a2 NB |
3732 | /* |
3733 | * This now assumes that passed sg_ents are in PAGE_SIZE chunks | |
3734 | * in order to calculate the number per task SGL entries | |
3735 | */ | |
3736 | task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE); | |
c66ac9db | 3737 | /* |
ec98f782 AG |
3738 | * Check if the fabric module driver is requesting that all |
3739 | * struct se_task->task_sg[] be chained together.. If so, | |
3740 | * then allocate an extra padding SG entry for linking and | |
c3c74c7a NB |
3741 | * marking the end of the chained SGL for every task except |
3742 | * the last one for (task_count > 1) operation, or skipping | |
3743 | * the extra padding for the (task_count == 1) case. | |
c66ac9db | 3744 | */ |
c3c74c7a NB |
3745 | if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) { |
3746 | task_sg_nents_padded = (task->task_sg_nents + 1); | |
c3c74c7a NB |
3747 | } else |
3748 | task_sg_nents_padded = task->task_sg_nents; | |
c66ac9db | 3749 | |
1d20bb61 | 3750 | task->task_sg = kmalloc(sizeof(struct scatterlist) * |
c3c74c7a | 3751 | task_sg_nents_padded, GFP_KERNEL); |
ec98f782 AG |
3752 | if (!task->task_sg) { |
3753 | cmd->se_dev->transport->free_task(task); | |
3754 | return -ENOMEM; | |
3755 | } | |
3756 | ||
c3c74c7a | 3757 | sg_init_table(task->task_sg, task_sg_nents_padded); |
c66ac9db | 3758 | |
ec98f782 AG |
3759 | task_size = task->task_size; |
3760 | ||
3761 | /* Build new sgl, only up to task_size */ | |
6708bb27 | 3762 | for_each_sg(task->task_sg, sg, task->task_sg_nents, count) { |
ec98f782 AG |
3763 | if (cmd_sg->length > task_size) |
3764 | break; | |
3765 | ||
3766 | *sg = *cmd_sg; | |
3767 | task_size -= cmd_sg->length; | |
3768 | cmd_sg = sg_next(cmd_sg); | |
c66ac9db | 3769 | } |
c66ac9db | 3770 | |
ec98f782 AG |
3771 | lba += task->task_sectors; |
3772 | sectors -= task->task_sectors; | |
c66ac9db | 3773 | |
ec98f782 AG |
3774 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3775 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3776 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3777 | } |
3778 | ||
ec98f782 | 3779 | return task_count; |
c66ac9db NB |
3780 | } |
3781 | ||
3782 | static int | |
ec98f782 | 3783 | transport_allocate_control_task(struct se_cmd *cmd) |
c66ac9db | 3784 | { |
c66ac9db | 3785 | struct se_task *task; |
ec98f782 | 3786 | unsigned long flags; |
c66ac9db | 3787 | |
91ec1d35 NB |
3788 | /* Workaround for handling zero-length control CDBs */ |
3789 | if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) && | |
3790 | !cmd->data_length) | |
3791 | return 0; | |
3792 | ||
c66ac9db NB |
3793 | task = transport_generic_get_task(cmd, cmd->data_direction); |
3794 | if (!task) | |
ec98f782 | 3795 | return -ENOMEM; |
c66ac9db | 3796 | |
af3f00c7 | 3797 | task->task_sg = cmd->t_data_sg; |
c66ac9db | 3798 | task->task_size = cmd->data_length; |
6708bb27 | 3799 | task->task_sg_nents = cmd->t_data_nents; |
c66ac9db | 3800 | |
ec98f782 AG |
3801 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3802 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3803 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 3804 | |
6708bb27 | 3805 | /* Success! Return number of tasks allocated */ |
a3eedc22 | 3806 | return 1; |
ec98f782 AG |
3807 | } |
3808 | ||
da0f7619 CH |
3809 | /* |
3810 | * Allocate any required ressources to execute the command, and either place | |
3811 | * it on the execution queue if possible. For writes we might not have the | |
3812 | * payload yet, thus notify the fabric via a call to ->write_pending instead. | |
c66ac9db | 3813 | */ |
a1d8b49a | 3814 | int transport_generic_new_cmd(struct se_cmd *cmd) |
c66ac9db | 3815 | { |
da0f7619 | 3816 | struct se_device *dev = cmd->se_dev; |
9ac54987 | 3817 | int task_cdbs, task_cdbs_bidi = 0; |
da0f7619 | 3818 | int set_counts = 1; |
c66ac9db NB |
3819 | int ret = 0; |
3820 | ||
3821 | /* | |
3822 | * Determine is the TCM fabric module has already allocated physical | |
3823 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 3824 | * beforehand. |
c66ac9db | 3825 | */ |
ec98f782 AG |
3826 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
3827 | cmd->data_length) { | |
05d1c7c0 | 3828 | ret = transport_generic_get_mem(cmd); |
c66ac9db | 3829 | if (ret < 0) |
03e98c9e | 3830 | goto out_fail; |
c66ac9db | 3831 | } |
da0f7619 | 3832 | |
1d20bb61 | 3833 | /* |
38b40067 | 3834 | * For BIDI command set up the read tasks first. |
1d20bb61 | 3835 | */ |
da0f7619 | 3836 | if (cmd->t_bidi_data_sg && |
38b40067 CH |
3837 | dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
3838 | BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)); | |
3839 | ||
9ac54987 NB |
3840 | task_cdbs_bidi = transport_allocate_data_tasks(cmd, |
3841 | DMA_FROM_DEVICE, cmd->t_bidi_data_sg, | |
3842 | cmd->t_bidi_data_nents); | |
3843 | if (task_cdbs_bidi <= 0) | |
da0f7619 CH |
3844 | goto out_fail; |
3845 | ||
3846 | atomic_inc(&cmd->t_fe_count); | |
3847 | atomic_inc(&cmd->t_se_count); | |
3848 | set_counts = 0; | |
3849 | } | |
38b40067 CH |
3850 | |
3851 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { | |
3852 | task_cdbs = transport_allocate_data_tasks(cmd, | |
3853 | cmd->data_direction, cmd->t_data_sg, | |
3854 | cmd->t_data_nents); | |
3855 | } else { | |
3856 | task_cdbs = transport_allocate_control_task(cmd); | |
3857 | } | |
3858 | ||
410f6702 | 3859 | if (task_cdbs < 0) |
da0f7619 | 3860 | goto out_fail; |
410f6702 RD |
3861 | else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) { |
3862 | cmd->t_state = TRANSPORT_COMPLETE; | |
3863 | atomic_set(&cmd->t_transport_active, 1); | |
91ec1d35 NB |
3864 | |
3865 | if (cmd->t_task_cdb[0] == REQUEST_SENSE) { | |
3866 | u8 ua_asc = 0, ua_ascq = 0; | |
3867 | ||
3868 | core_scsi3_ua_clear_for_request_sense(cmd, | |
3869 | &ua_asc, &ua_ascq); | |
3870 | } | |
3871 | ||
410f6702 RD |
3872 | INIT_WORK(&cmd->work, target_complete_ok_work); |
3873 | queue_work(target_completion_wq, &cmd->work); | |
3874 | return 0; | |
3875 | } | |
da0f7619 CH |
3876 | |
3877 | if (set_counts) { | |
3878 | atomic_inc(&cmd->t_fe_count); | |
3879 | atomic_inc(&cmd->t_se_count); | |
3880 | } | |
3881 | ||
9ac54987 NB |
3882 | cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi); |
3883 | atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num); | |
3884 | atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num); | |
da0f7619 | 3885 | |
c66ac9db | 3886 | /* |
a1d8b49a | 3887 | * For WRITEs, let the fabric know its buffer is ready.. |
c66ac9db NB |
3888 | * This WRITE struct se_cmd (and all of its associated struct se_task's) |
3889 | * will be added to the struct se_device execution queue after its WRITE | |
3890 | * data has arrived. (ie: It gets handled by the transport processing | |
3891 | * thread a second time) | |
3892 | */ | |
3893 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
3894 | transport_add_tasks_to_state_queue(cmd); | |
3895 | return transport_generic_write_pending(cmd); | |
3896 | } | |
3897 | /* | |
3898 | * Everything else but a WRITE, add the struct se_cmd's struct se_task's | |
3899 | * to the execution queue. | |
3900 | */ | |
3901 | transport_execute_tasks(cmd); | |
3902 | return 0; | |
da0f7619 CH |
3903 | |
3904 | out_fail: | |
3905 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3906 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
3907 | return -EINVAL; | |
c66ac9db | 3908 | } |
a1d8b49a | 3909 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db NB |
3910 | |
3911 | /* transport_generic_process_write(): | |
3912 | * | |
3913 | * | |
3914 | */ | |
3915 | void transport_generic_process_write(struct se_cmd *cmd) | |
3916 | { | |
c66ac9db NB |
3917 | transport_execute_tasks(cmd); |
3918 | } | |
3919 | EXPORT_SYMBOL(transport_generic_process_write); | |
3920 | ||
e057f533 | 3921 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 3922 | { |
f147abb4 NB |
3923 | int ret; |
3924 | ||
3925 | ret = cmd->se_tfo->write_pending(cmd); | |
3926 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
e057f533 CH |
3927 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
3928 | cmd); | |
3929 | transport_handle_queue_full(cmd, cmd->se_dev); | |
3930 | } | |
07bde79a NB |
3931 | } |
3932 | ||
c66ac9db NB |
3933 | static int transport_generic_write_pending(struct se_cmd *cmd) |
3934 | { | |
3935 | unsigned long flags; | |
3936 | int ret; | |
3937 | ||
a1d8b49a | 3938 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3939 | cmd->t_state = TRANSPORT_WRITE_PENDING; |
a1d8b49a | 3940 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
07bde79a | 3941 | |
c66ac9db NB |
3942 | /* |
3943 | * Clear the se_cmd for WRITE_PENDING status in order to set | |
a1d8b49a | 3944 | * cmd->t_transport_active=0 so that transport_generic_handle_data |
c66ac9db | 3945 | * can be called from HW target mode interrupt code. This is safe |
e3d6f909 | 3946 | * to be called with transport_off=1 before the cmd->se_tfo->write_pending |
c66ac9db NB |
3947 | * because the se_cmd->se_lun pointer is not being cleared. |
3948 | */ | |
3949 | transport_cmd_check_stop(cmd, 1, 0); | |
3950 | ||
3951 | /* | |
3952 | * Call the fabric write_pending function here to let the | |
3953 | * frontend know that WRITE buffers are ready. | |
3954 | */ | |
e3d6f909 | 3955 | ret = cmd->se_tfo->write_pending(cmd); |
f147abb4 | 3956 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a NB |
3957 | goto queue_full; |
3958 | else if (ret < 0) | |
c66ac9db NB |
3959 | return ret; |
3960 | ||
03e98c9e | 3961 | return 1; |
07bde79a NB |
3962 | |
3963 | queue_full: | |
6708bb27 | 3964 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); |
07bde79a | 3965 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; |
e057f533 | 3966 | transport_handle_queue_full(cmd, cmd->se_dev); |
f147abb4 | 3967 | return 0; |
c66ac9db NB |
3968 | } |
3969 | ||
39c05f32 | 3970 | void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 3971 | { |
d14921d6 NB |
3972 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
3973 | if (wait_for_tasks && cmd->se_tmr_req) | |
3974 | transport_wait_for_tasks(cmd); | |
3975 | ||
35462975 | 3976 | transport_release_cmd(cmd); |
d14921d6 NB |
3977 | } else { |
3978 | if (wait_for_tasks) | |
3979 | transport_wait_for_tasks(cmd); | |
3980 | ||
c66ac9db NB |
3981 | core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); |
3982 | ||
82f1c8a4 | 3983 | if (cmd->se_lun) |
c66ac9db | 3984 | transport_lun_remove_cmd(cmd); |
c66ac9db | 3985 | |
f4366772 NB |
3986 | transport_free_dev_tasks(cmd); |
3987 | ||
39c05f32 | 3988 | transport_put_cmd(cmd); |
c66ac9db NB |
3989 | } |
3990 | } | |
3991 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
3992 | ||
a17f091d NB |
3993 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
3994 | * @se_sess: session to reference | |
3995 | * @se_cmd: command descriptor to add | |
a6360785 | 3996 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 3997 | */ |
a6360785 NB |
3998 | void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, |
3999 | bool ack_kref) | |
a17f091d NB |
4000 | { |
4001 | unsigned long flags; | |
4002 | ||
7481deb4 | 4003 | kref_init(&se_cmd->cmd_kref); |
a6360785 NB |
4004 | /* |
4005 | * Add a second kref if the fabric caller is expecting to handle | |
4006 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
4007 | * invocations before se_cmd descriptor release. | |
4008 | */ | |
4009 | if (ack_kref == true) | |
4010 | kref_get(&se_cmd->cmd_kref); | |
7481deb4 | 4011 | |
a17f091d NB |
4012 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
4013 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); | |
4014 | se_cmd->check_release = 1; | |
4015 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4016 | } | |
4017 | EXPORT_SYMBOL(target_get_sess_cmd); | |
4018 | ||
7481deb4 | 4019 | static void target_release_cmd_kref(struct kref *kref) |
a17f091d | 4020 | { |
7481deb4 NB |
4021 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
4022 | struct se_session *se_sess = se_cmd->se_sess; | |
a17f091d NB |
4023 | unsigned long flags; |
4024 | ||
4025 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
4026 | if (list_empty(&se_cmd->se_cmd_list)) { | |
4027 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4028 | WARN_ON(1); | |
7481deb4 | 4029 | return; |
a17f091d | 4030 | } |
a17f091d NB |
4031 | if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { |
4032 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4033 | complete(&se_cmd->cmd_wait_comp); | |
7481deb4 | 4034 | return; |
a17f091d NB |
4035 | } |
4036 | list_del(&se_cmd->se_cmd_list); | |
4037 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4038 | ||
7481deb4 NB |
4039 | se_cmd->se_tfo->release_cmd(se_cmd); |
4040 | } | |
4041 | ||
4042 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put | |
4043 | * @se_sess: session to reference | |
4044 | * @se_cmd: command descriptor to drop | |
4045 | */ | |
4046 | int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) | |
4047 | { | |
4048 | return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); | |
a17f091d NB |
4049 | } |
4050 | EXPORT_SYMBOL(target_put_sess_cmd); | |
4051 | ||
4052 | /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list | |
4053 | * @se_sess: session to split | |
4054 | */ | |
4055 | void target_splice_sess_cmd_list(struct se_session *se_sess) | |
4056 | { | |
4057 | struct se_cmd *se_cmd; | |
4058 | unsigned long flags; | |
4059 | ||
4060 | WARN_ON(!list_empty(&se_sess->sess_wait_list)); | |
4061 | INIT_LIST_HEAD(&se_sess->sess_wait_list); | |
4062 | ||
4063 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
4064 | se_sess->sess_tearing_down = 1; | |
4065 | ||
4066 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); | |
4067 | ||
4068 | list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) | |
4069 | se_cmd->cmd_wait_set = 1; | |
4070 | ||
4071 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4072 | } | |
4073 | EXPORT_SYMBOL(target_splice_sess_cmd_list); | |
4074 | ||
4075 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors | |
4076 | * @se_sess: session to wait for active I/O | |
4077 | * @wait_for_tasks: Make extra transport_wait_for_tasks call | |
4078 | */ | |
4079 | void target_wait_for_sess_cmds( | |
4080 | struct se_session *se_sess, | |
4081 | int wait_for_tasks) | |
4082 | { | |
4083 | struct se_cmd *se_cmd, *tmp_cmd; | |
4084 | bool rc = false; | |
4085 | ||
4086 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
4087 | &se_sess->sess_wait_list, se_cmd_list) { | |
4088 | list_del(&se_cmd->se_cmd_list); | |
4089 | ||
4090 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" | |
4091 | " %d\n", se_cmd, se_cmd->t_state, | |
4092 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4093 | ||
4094 | if (wait_for_tasks) { | |
4095 | pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d," | |
4096 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4097 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4098 | ||
4099 | rc = transport_wait_for_tasks(se_cmd); | |
4100 | ||
4101 | pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d," | |
4102 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4103 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4104 | } | |
4105 | ||
4106 | if (!rc) { | |
4107 | wait_for_completion(&se_cmd->cmd_wait_comp); | |
4108 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" | |
4109 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4110 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4111 | } | |
4112 | ||
4113 | se_cmd->se_tfo->release_cmd(se_cmd); | |
4114 | } | |
4115 | } | |
4116 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
4117 | ||
c66ac9db NB |
4118 | /* transport_lun_wait_for_tasks(): |
4119 | * | |
4120 | * Called from ConfigFS context to stop the passed struct se_cmd to allow | |
4121 | * an struct se_lun to be successfully shutdown. | |
4122 | */ | |
4123 | static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) | |
4124 | { | |
4125 | unsigned long flags; | |
4126 | int ret; | |
4127 | /* | |
4128 | * If the frontend has already requested this struct se_cmd to | |
4129 | * be stopped, we can safely ignore this struct se_cmd. | |
4130 | */ | |
a1d8b49a AG |
4131 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4132 | if (atomic_read(&cmd->t_transport_stop)) { | |
4133 | atomic_set(&cmd->transport_lun_stop, 0); | |
6708bb27 | 4134 | pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop ==" |
e3d6f909 | 4135 | " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 4136 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4137 | transport_cmd_check_stop(cmd, 1, 0); |
e3d6f909 | 4138 | return -EPERM; |
c66ac9db | 4139 | } |
a1d8b49a AG |
4140 | atomic_set(&cmd->transport_lun_fe_stop, 1); |
4141 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 4142 | |
5951146d | 4143 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
4144 | |
4145 | ret = transport_stop_tasks_for_cmd(cmd); | |
4146 | ||
6708bb27 AG |
4147 | pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:" |
4148 | " %d\n", cmd, cmd->t_task_list_num, ret); | |
c66ac9db | 4149 | if (!ret) { |
6708bb27 | 4150 | pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", |
e3d6f909 | 4151 | cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 4152 | wait_for_completion(&cmd->transport_lun_stop_comp); |
6708bb27 | 4153 | pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", |
e3d6f909 | 4154 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4155 | } |
3df8d40b | 4156 | transport_remove_cmd_from_queue(cmd); |
c66ac9db NB |
4157 | |
4158 | return 0; | |
4159 | } | |
4160 | ||
c66ac9db NB |
4161 | static void __transport_clear_lun_from_sessions(struct se_lun *lun) |
4162 | { | |
4163 | struct se_cmd *cmd = NULL; | |
4164 | unsigned long lun_flags, cmd_flags; | |
4165 | /* | |
4166 | * Do exception processing and return CHECK_CONDITION status to the | |
4167 | * Initiator Port. | |
4168 | */ | |
4169 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); | |
5951146d AG |
4170 | while (!list_empty(&lun->lun_cmd_list)) { |
4171 | cmd = list_first_entry(&lun->lun_cmd_list, | |
4172 | struct se_cmd, se_lun_node); | |
4173 | list_del(&cmd->se_lun_node); | |
4174 | ||
a1d8b49a | 4175 | atomic_set(&cmd->transport_lun_active, 0); |
c66ac9db NB |
4176 | /* |
4177 | * This will notify iscsi_target_transport.c: | |
4178 | * transport_cmd_check_stop() that a LUN shutdown is in | |
4179 | * progress for the iscsi_cmd_t. | |
4180 | */ | |
a1d8b49a | 4181 | spin_lock(&cmd->t_state_lock); |
6708bb27 | 4182 | pr_debug("SE_LUN[%d] - Setting cmd->transport" |
c66ac9db | 4183 | "_lun_stop for ITT: 0x%08x\n", |
e3d6f909 AG |
4184 | cmd->se_lun->unpacked_lun, |
4185 | cmd->se_tfo->get_task_tag(cmd)); | |
a1d8b49a AG |
4186 | atomic_set(&cmd->transport_lun_stop, 1); |
4187 | spin_unlock(&cmd->t_state_lock); | |
c66ac9db NB |
4188 | |
4189 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4190 | ||
6708bb27 AG |
4191 | if (!cmd->se_lun) { |
4192 | pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", | |
e3d6f909 AG |
4193 | cmd->se_tfo->get_task_tag(cmd), |
4194 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db NB |
4195 | BUG(); |
4196 | } | |
4197 | /* | |
4198 | * If the Storage engine still owns the iscsi_cmd_t, determine | |
4199 | * and/or stop its context. | |
4200 | */ | |
6708bb27 | 4201 | pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" |
e3d6f909 AG |
4202 | "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, |
4203 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4204 | |
e3d6f909 | 4205 | if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { |
c66ac9db NB |
4206 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4207 | continue; | |
4208 | } | |
4209 | ||
6708bb27 | 4210 | pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" |
c66ac9db | 4211 | "_wait_for_tasks(): SUCCESS\n", |
e3d6f909 AG |
4212 | cmd->se_lun->unpacked_lun, |
4213 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4214 | |
a1d8b49a | 4215 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
6708bb27 | 4216 | if (!atomic_read(&cmd->transport_dev_active)) { |
a1d8b49a | 4217 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4218 | goto check_cond; |
4219 | } | |
a1d8b49a | 4220 | atomic_set(&cmd->transport_dev_active, 0); |
c66ac9db | 4221 | transport_all_task_dev_remove_state(cmd); |
a1d8b49a | 4222 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4223 | |
4224 | transport_free_dev_tasks(cmd); | |
4225 | /* | |
4226 | * The Storage engine stopped this struct se_cmd before it was | |
4227 | * send to the fabric frontend for delivery back to the | |
4228 | * Initiator Node. Return this SCSI CDB back with an | |
4229 | * CHECK_CONDITION status. | |
4230 | */ | |
4231 | check_cond: | |
4232 | transport_send_check_condition_and_sense(cmd, | |
4233 | TCM_NON_EXISTENT_LUN, 0); | |
4234 | /* | |
4235 | * If the fabric frontend is waiting for this iscsi_cmd_t to | |
4236 | * be released, notify the waiting thread now that LU has | |
4237 | * finished accessing it. | |
4238 | */ | |
a1d8b49a AG |
4239 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
4240 | if (atomic_read(&cmd->transport_lun_fe_stop)) { | |
6708bb27 | 4241 | pr_debug("SE_LUN[%d] - Detected FE stop for" |
c66ac9db NB |
4242 | " struct se_cmd: %p ITT: 0x%08x\n", |
4243 | lun->unpacked_lun, | |
e3d6f909 | 4244 | cmd, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4245 | |
a1d8b49a | 4246 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
4247 | cmd_flags); |
4248 | transport_cmd_check_stop(cmd, 1, 0); | |
a1d8b49a | 4249 | complete(&cmd->transport_lun_fe_stop_comp); |
c66ac9db NB |
4250 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4251 | continue; | |
4252 | } | |
6708bb27 | 4253 | pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", |
e3d6f909 | 4254 | lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4255 | |
a1d8b49a | 4256 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4257 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4258 | } | |
4259 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4260 | } | |
4261 | ||
4262 | static int transport_clear_lun_thread(void *p) | |
4263 | { | |
8359cf43 | 4264 | struct se_lun *lun = p; |
c66ac9db NB |
4265 | |
4266 | __transport_clear_lun_from_sessions(lun); | |
4267 | complete(&lun->lun_shutdown_comp); | |
4268 | ||
4269 | return 0; | |
4270 | } | |
4271 | ||
4272 | int transport_clear_lun_from_sessions(struct se_lun *lun) | |
4273 | { | |
4274 | struct task_struct *kt; | |
4275 | ||
5951146d | 4276 | kt = kthread_run(transport_clear_lun_thread, lun, |
c66ac9db NB |
4277 | "tcm_cl_%u", lun->unpacked_lun); |
4278 | if (IS_ERR(kt)) { | |
6708bb27 | 4279 | pr_err("Unable to start clear_lun thread\n"); |
e3d6f909 | 4280 | return PTR_ERR(kt); |
c66ac9db NB |
4281 | } |
4282 | wait_for_completion(&lun->lun_shutdown_comp); | |
4283 | ||
4284 | return 0; | |
4285 | } | |
4286 | ||
d14921d6 NB |
4287 | /** |
4288 | * transport_wait_for_tasks - wait for completion to occur | |
4289 | * @cmd: command to wait | |
c66ac9db | 4290 | * |
d14921d6 NB |
4291 | * Called from frontend fabric context to wait for storage engine |
4292 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 4293 | */ |
a17f091d | 4294 | bool transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
4295 | { |
4296 | unsigned long flags; | |
4297 | ||
a1d8b49a | 4298 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
d14921d6 NB |
4299 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) { |
4300 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
a17f091d | 4301 | return false; |
d14921d6 NB |
4302 | } |
4303 | /* | |
4304 | * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE | |
4305 | * has been set in transport_set_supported_SAM_opcode(). | |
4306 | */ | |
4307 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) { | |
4308 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
a17f091d | 4309 | return false; |
d14921d6 | 4310 | } |
c66ac9db NB |
4311 | /* |
4312 | * If we are already stopped due to an external event (ie: LUN shutdown) | |
4313 | * sleep until the connection can have the passed struct se_cmd back. | |
a1d8b49a | 4314 | * The cmd->transport_lun_stopped_sem will be upped by |
c66ac9db NB |
4315 | * transport_clear_lun_from_sessions() once the ConfigFS context caller |
4316 | * has completed its operation on the struct se_cmd. | |
4317 | */ | |
a1d8b49a | 4318 | if (atomic_read(&cmd->transport_lun_stop)) { |
c66ac9db | 4319 | |
6708bb27 | 4320 | pr_debug("wait_for_tasks: Stopping" |
e3d6f909 | 4321 | " wait_for_completion(&cmd->t_tasktransport_lun_fe" |
c66ac9db | 4322 | "_stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4323 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4324 | /* |
4325 | * There is a special case for WRITES where a FE exception + | |
4326 | * LUN shutdown means ConfigFS context is still sleeping on | |
4327 | * transport_lun_stop_comp in transport_lun_wait_for_tasks(). | |
4328 | * We go ahead and up transport_lun_stop_comp just to be sure | |
4329 | * here. | |
4330 | */ | |
a1d8b49a AG |
4331 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
4332 | complete(&cmd->transport_lun_stop_comp); | |
4333 | wait_for_completion(&cmd->transport_lun_fe_stop_comp); | |
4334 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
c66ac9db NB |
4335 | |
4336 | transport_all_task_dev_remove_state(cmd); | |
4337 | /* | |
4338 | * At this point, the frontend who was the originator of this | |
4339 | * struct se_cmd, now owns the structure and can be released through | |
4340 | * normal means below. | |
4341 | */ | |
6708bb27 | 4342 | pr_debug("wait_for_tasks: Stopped" |
e3d6f909 | 4343 | " wait_for_completion(&cmd->t_tasktransport_lun_fe_" |
c66ac9db | 4344 | "stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4345 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4346 | |
a1d8b49a | 4347 | atomic_set(&cmd->transport_lun_stop, 0); |
c66ac9db | 4348 | } |
a1d8b49a | 4349 | if (!atomic_read(&cmd->t_transport_active) || |
d14921d6 NB |
4350 | atomic_read(&cmd->t_transport_aborted)) { |
4351 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
a17f091d | 4352 | return false; |
d14921d6 | 4353 | } |
c66ac9db | 4354 | |
a1d8b49a | 4355 | atomic_set(&cmd->t_transport_stop, 1); |
c66ac9db | 4356 | |
6708bb27 | 4357 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" |
f2da9dbd CH |
4358 | " i_state: %d, t_state: %d, t_transport_stop = TRUE\n", |
4359 | cmd, cmd->se_tfo->get_task_tag(cmd), | |
4360 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db | 4361 | |
a1d8b49a | 4362 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4363 | |
5951146d | 4364 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db | 4365 | |
a1d8b49a | 4366 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 4367 | |
a1d8b49a AG |
4368 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4369 | atomic_set(&cmd->t_transport_active, 0); | |
4370 | atomic_set(&cmd->t_transport_stop, 0); | |
c66ac9db | 4371 | |
6708bb27 | 4372 | pr_debug("wait_for_tasks: Stopped wait_for_compltion(" |
a1d8b49a | 4373 | "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", |
e3d6f909 | 4374 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4375 | |
d14921d6 | 4376 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d NB |
4377 | |
4378 | return true; | |
c66ac9db | 4379 | } |
d14921d6 | 4380 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db NB |
4381 | |
4382 | static int transport_get_sense_codes( | |
4383 | struct se_cmd *cmd, | |
4384 | u8 *asc, | |
4385 | u8 *ascq) | |
4386 | { | |
4387 | *asc = cmd->scsi_asc; | |
4388 | *ascq = cmd->scsi_ascq; | |
4389 | ||
4390 | return 0; | |
4391 | } | |
4392 | ||
4393 | static int transport_set_sense_codes( | |
4394 | struct se_cmd *cmd, | |
4395 | u8 asc, | |
4396 | u8 ascq) | |
4397 | { | |
4398 | cmd->scsi_asc = asc; | |
4399 | cmd->scsi_ascq = ascq; | |
4400 | ||
4401 | return 0; | |
4402 | } | |
4403 | ||
4404 | int transport_send_check_condition_and_sense( | |
4405 | struct se_cmd *cmd, | |
4406 | u8 reason, | |
4407 | int from_transport) | |
4408 | { | |
4409 | unsigned char *buffer = cmd->sense_buffer; | |
4410 | unsigned long flags; | |
4411 | int offset; | |
4412 | u8 asc = 0, ascq = 0; | |
4413 | ||
a1d8b49a | 4414 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 4415 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 4416 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4417 | return 0; |
4418 | } | |
4419 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 4420 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4421 | |
4422 | if (!reason && from_transport) | |
4423 | goto after_reason; | |
4424 | ||
4425 | if (!from_transport) | |
4426 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; | |
4427 | /* | |
4428 | * Data Segment and SenseLength of the fabric response PDU. | |
4429 | * | |
4430 | * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE | |
4431 | * from include/scsi/scsi_cmnd.h | |
4432 | */ | |
e3d6f909 | 4433 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
4434 | TRANSPORT_SENSE_BUFFER); |
4435 | /* | |
4436 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses | |
4437 | * SENSE KEY values from include/scsi/scsi.h | |
4438 | */ | |
4439 | switch (reason) { | |
4440 | case TCM_NON_EXISTENT_LUN: | |
eb39d340 NB |
4441 | /* CURRENT ERROR */ |
4442 | buffer[offset] = 0x70; | |
895f3022 | 4443 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
eb39d340 NB |
4444 | /* ILLEGAL REQUEST */ |
4445 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4446 | /* LOGICAL UNIT NOT SUPPORTED */ | |
4447 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25; | |
4448 | break; | |
c66ac9db NB |
4449 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
4450 | case TCM_SECTOR_COUNT_TOO_MANY: | |
4451 | /* CURRENT ERROR */ | |
4452 | buffer[offset] = 0x70; | |
895f3022 | 4453 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4454 | /* ILLEGAL REQUEST */ |
4455 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4456 | /* INVALID COMMAND OPERATION CODE */ | |
4457 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; | |
4458 | break; | |
4459 | case TCM_UNKNOWN_MODE_PAGE: | |
4460 | /* CURRENT ERROR */ | |
4461 | buffer[offset] = 0x70; | |
895f3022 | 4462 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4463 | /* ILLEGAL REQUEST */ |
4464 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4465 | /* INVALID FIELD IN CDB */ | |
4466 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4467 | break; | |
4468 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
4469 | /* CURRENT ERROR */ | |
4470 | buffer[offset] = 0x70; | |
895f3022 | 4471 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4472 | /* ABORTED COMMAND */ |
4473 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4474 | /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
4475 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; | |
4476 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; | |
4477 | break; | |
4478 | case TCM_INCORRECT_AMOUNT_OF_DATA: | |
4479 | /* CURRENT ERROR */ | |
4480 | buffer[offset] = 0x70; | |
895f3022 | 4481 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4482 | /* ABORTED COMMAND */ |
4483 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4484 | /* WRITE ERROR */ | |
4485 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4486 | /* NOT ENOUGH UNSOLICITED DATA */ | |
4487 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; | |
4488 | break; | |
4489 | case TCM_INVALID_CDB_FIELD: | |
4490 | /* CURRENT ERROR */ | |
4491 | buffer[offset] = 0x70; | |
895f3022 | 4492 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
4493 | /* ILLEGAL REQUEST */ |
4494 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
4495 | /* INVALID FIELD IN CDB */ |
4496 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4497 | break; | |
4498 | case TCM_INVALID_PARAMETER_LIST: | |
4499 | /* CURRENT ERROR */ | |
4500 | buffer[offset] = 0x70; | |
895f3022 | 4501 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
4502 | /* ILLEGAL REQUEST */ |
4503 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
4504 | /* INVALID FIELD IN PARAMETER LIST */ |
4505 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; | |
4506 | break; | |
4507 | case TCM_UNEXPECTED_UNSOLICITED_DATA: | |
4508 | /* CURRENT ERROR */ | |
4509 | buffer[offset] = 0x70; | |
895f3022 | 4510 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4511 | /* ABORTED COMMAND */ |
4512 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4513 | /* WRITE ERROR */ | |
4514 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4515 | /* UNEXPECTED_UNSOLICITED_DATA */ | |
4516 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; | |
4517 | break; | |
4518 | case TCM_SERVICE_CRC_ERROR: | |
4519 | /* CURRENT ERROR */ | |
4520 | buffer[offset] = 0x70; | |
895f3022 | 4521 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4522 | /* ABORTED COMMAND */ |
4523 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4524 | /* PROTOCOL SERVICE CRC ERROR */ | |
4525 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; | |
4526 | /* N/A */ | |
4527 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; | |
4528 | break; | |
4529 | case TCM_SNACK_REJECTED: | |
4530 | /* CURRENT ERROR */ | |
4531 | buffer[offset] = 0x70; | |
895f3022 | 4532 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4533 | /* ABORTED COMMAND */ |
4534 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4535 | /* READ ERROR */ | |
4536 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; | |
4537 | /* FAILED RETRANSMISSION REQUEST */ | |
4538 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; | |
4539 | break; | |
4540 | case TCM_WRITE_PROTECTED: | |
4541 | /* CURRENT ERROR */ | |
4542 | buffer[offset] = 0x70; | |
895f3022 | 4543 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4544 | /* DATA PROTECT */ |
4545 | buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; | |
4546 | /* WRITE PROTECTED */ | |
4547 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; | |
4548 | break; | |
4549 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
4550 | /* CURRENT ERROR */ | |
4551 | buffer[offset] = 0x70; | |
895f3022 | 4552 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4553 | /* UNIT ATTENTION */ |
4554 | buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; | |
4555 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
4556 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4557 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4558 | break; | |
4559 | case TCM_CHECK_CONDITION_NOT_READY: | |
4560 | /* CURRENT ERROR */ | |
4561 | buffer[offset] = 0x70; | |
895f3022 | 4562 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4563 | /* Not Ready */ |
4564 | buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
4565 | transport_get_sense_codes(cmd, &asc, &ascq); | |
4566 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4567 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4568 | break; | |
4569 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
4570 | default: | |
4571 | /* CURRENT ERROR */ | |
4572 | buffer[offset] = 0x70; | |
895f3022 | 4573 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4574 | /* ILLEGAL REQUEST */ |
4575 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4576 | /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
4577 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; | |
4578 | break; | |
4579 | } | |
4580 | /* | |
4581 | * This code uses linux/include/scsi/scsi.h SAM status codes! | |
4582 | */ | |
4583 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
4584 | /* | |
4585 | * Automatically padded, this value is encoded in the fabric's | |
4586 | * data_length response PDU containing the SCSI defined sense data. | |
4587 | */ | |
4588 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; | |
4589 | ||
4590 | after_reason: | |
07bde79a | 4591 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4592 | } |
4593 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
4594 | ||
4595 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
4596 | { | |
4597 | int ret = 0; | |
4598 | ||
a1d8b49a | 4599 | if (atomic_read(&cmd->t_transport_aborted) != 0) { |
6708bb27 | 4600 | if (!send_status || |
c66ac9db NB |
4601 | (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) |
4602 | return 1; | |
4603 | #if 0 | |
6708bb27 | 4604 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED" |
c66ac9db | 4605 | " status for CDB: 0x%02x ITT: 0x%08x\n", |
a1d8b49a | 4606 | cmd->t_task_cdb[0], |
e3d6f909 | 4607 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4608 | #endif |
4609 | cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; | |
e3d6f909 | 4610 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4611 | ret = 1; |
4612 | } | |
4613 | return ret; | |
4614 | } | |
4615 | EXPORT_SYMBOL(transport_check_aborted_status); | |
4616 | ||
4617 | void transport_send_task_abort(struct se_cmd *cmd) | |
4618 | { | |
c252f003 NB |
4619 | unsigned long flags; |
4620 | ||
4621 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
4622 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { | |
4623 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4624 | return; | |
4625 | } | |
4626 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4627 | ||
c66ac9db NB |
4628 | /* |
4629 | * If there are still expected incoming fabric WRITEs, we wait | |
4630 | * until until they have completed before sending a TASK_ABORTED | |
4631 | * response. This response with TASK_ABORTED status will be | |
4632 | * queued back to fabric module by transport_check_aborted_status(). | |
4633 | */ | |
4634 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 4635 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
a1d8b49a | 4636 | atomic_inc(&cmd->t_transport_aborted); |
c66ac9db | 4637 | smp_mb__after_atomic_inc(); |
c66ac9db NB |
4638 | } |
4639 | } | |
4640 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
4641 | #if 0 | |
6708bb27 | 4642 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
a1d8b49a | 4643 | " ITT: 0x%08x\n", cmd->t_task_cdb[0], |
e3d6f909 | 4644 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4645 | #endif |
e3d6f909 | 4646 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4647 | } |
4648 | ||
e26d99ae | 4649 | static int transport_generic_do_tmr(struct se_cmd *cmd) |
c66ac9db | 4650 | { |
5951146d | 4651 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
4652 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
4653 | int ret; | |
4654 | ||
4655 | switch (tmr->function) { | |
5c6cd613 | 4656 | case TMR_ABORT_TASK: |
c66ac9db NB |
4657 | tmr->response = TMR_FUNCTION_REJECTED; |
4658 | break; | |
5c6cd613 NB |
4659 | case TMR_ABORT_TASK_SET: |
4660 | case TMR_CLEAR_ACA: | |
4661 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
4662 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
4663 | break; | |
5c6cd613 | 4664 | case TMR_LUN_RESET: |
c66ac9db NB |
4665 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
4666 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
4667 | TMR_FUNCTION_REJECTED; | |
4668 | break; | |
5c6cd613 | 4669 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
4670 | tmr->response = TMR_FUNCTION_REJECTED; |
4671 | break; | |
5c6cd613 | 4672 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
4673 | tmr->response = TMR_FUNCTION_REJECTED; |
4674 | break; | |
c66ac9db | 4675 | default: |
6708bb27 | 4676 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
4677 | tmr->function); |
4678 | tmr->response = TMR_FUNCTION_REJECTED; | |
4679 | break; | |
4680 | } | |
4681 | ||
4682 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 4683 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 4684 | |
b7b8bef7 | 4685 | transport_cmd_check_stop_to_fabric(cmd); |
c66ac9db NB |
4686 | return 0; |
4687 | } | |
4688 | ||
c66ac9db NB |
4689 | /* transport_processing_thread(): |
4690 | * | |
4691 | * | |
4692 | */ | |
4693 | static int transport_processing_thread(void *param) | |
4694 | { | |
5951146d | 4695 | int ret; |
c66ac9db | 4696 | struct se_cmd *cmd; |
8359cf43 | 4697 | struct se_device *dev = param; |
c66ac9db | 4698 | |
c66ac9db | 4699 | while (!kthread_should_stop()) { |
e3d6f909 AG |
4700 | ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq, |
4701 | atomic_read(&dev->dev_queue_obj.queue_cnt) || | |
c66ac9db NB |
4702 | kthread_should_stop()); |
4703 | if (ret < 0) | |
4704 | goto out; | |
4705 | ||
c66ac9db | 4706 | get_cmd: |
5951146d AG |
4707 | cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj); |
4708 | if (!cmd) | |
c66ac9db NB |
4709 | continue; |
4710 | ||
5951146d | 4711 | switch (cmd->t_state) { |
680b73c5 CH |
4712 | case TRANSPORT_NEW_CMD: |
4713 | BUG(); | |
4714 | break; | |
c66ac9db | 4715 | case TRANSPORT_NEW_CMD_MAP: |
6708bb27 AG |
4716 | if (!cmd->se_tfo->new_cmd_map) { |
4717 | pr_err("cmd->se_tfo->new_cmd_map is" | |
c66ac9db NB |
4718 | " NULL for TRANSPORT_NEW_CMD_MAP\n"); |
4719 | BUG(); | |
4720 | } | |
e3d6f909 | 4721 | ret = cmd->se_tfo->new_cmd_map(cmd); |
c66ac9db | 4722 | if (ret < 0) { |
03e98c9e | 4723 | transport_generic_request_failure(cmd); |
c66ac9db NB |
4724 | break; |
4725 | } | |
c66ac9db | 4726 | ret = transport_generic_new_cmd(cmd); |
f147abb4 | 4727 | if (ret < 0) { |
03e98c9e NB |
4728 | transport_generic_request_failure(cmd); |
4729 | break; | |
c66ac9db NB |
4730 | } |
4731 | break; | |
4732 | case TRANSPORT_PROCESS_WRITE: | |
4733 | transport_generic_process_write(cmd); | |
4734 | break; | |
c66ac9db NB |
4735 | case TRANSPORT_PROCESS_TMR: |
4736 | transport_generic_do_tmr(cmd); | |
4737 | break; | |
07bde79a | 4738 | case TRANSPORT_COMPLETE_QF_WP: |
e057f533 CH |
4739 | transport_write_pending_qf(cmd); |
4740 | break; | |
4741 | case TRANSPORT_COMPLETE_QF_OK: | |
4742 | transport_complete_qf(cmd); | |
07bde79a | 4743 | break; |
c66ac9db | 4744 | default: |
f2da9dbd CH |
4745 | pr_err("Unknown t_state: %d for ITT: 0x%08x " |
4746 | "i_state: %d on SE LUN: %u\n", | |
4747 | cmd->t_state, | |
e3d6f909 AG |
4748 | cmd->se_tfo->get_task_tag(cmd), |
4749 | cmd->se_tfo->get_cmd_state(cmd), | |
4750 | cmd->se_lun->unpacked_lun); | |
c66ac9db NB |
4751 | BUG(); |
4752 | } | |
4753 | ||
4754 | goto get_cmd; | |
4755 | } | |
4756 | ||
4757 | out: | |
ce8762f6 NB |
4758 | WARN_ON(!list_empty(&dev->state_task_list)); |
4759 | WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list)); | |
c66ac9db NB |
4760 | dev->process_thread = NULL; |
4761 | return 0; | |
4762 | } |