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057cbf49 NB |
1 | /******************************************************************************* |
2 | * Vhost kernel TCM fabric driver for virtio SCSI initiators | |
3 | * | |
4 | * (C) Copyright 2010-2012 RisingTide Systems LLC. | |
5 | * (C) Copyright 2010-2012 IBM Corp. | |
6 | * | |
7 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
8 | * | |
9 | * Authors: Nicholas A. Bellinger <nab@risingtidesystems.com> | |
10 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | ****************************************************************************/ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/moduleparam.h> | |
26 | #include <generated/utsrelease.h> | |
27 | #include <linux/utsname.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/kthread.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/configfs.h> | |
34 | #include <linux/ctype.h> | |
35 | #include <linux/compat.h> | |
36 | #include <linux/eventfd.h> | |
057cbf49 NB |
37 | #include <linux/fs.h> |
38 | #include <linux/miscdevice.h> | |
39 | #include <asm/unaligned.h> | |
40 | #include <scsi/scsi.h> | |
41 | #include <scsi/scsi_tcq.h> | |
42 | #include <target/target_core_base.h> | |
43 | #include <target/target_core_fabric.h> | |
44 | #include <target/target_core_fabric_configfs.h> | |
45 | #include <target/target_core_configfs.h> | |
46 | #include <target/configfs_macros.h> | |
47 | #include <linux/vhost.h> | |
057cbf49 | 48 | #include <linux/virtio_scsi.h> |
9d6064a3 | 49 | #include <linux/llist.h> |
1b7f390e | 50 | #include <linux/bitmap.h> |
057cbf49 | 51 | |
057cbf49 | 52 | #include "vhost.h" |
5012a3a3 MT |
53 | |
54 | #define TCM_VHOST_VERSION "v0.1" | |
55 | #define TCM_VHOST_NAMELEN 256 | |
56 | #define TCM_VHOST_MAX_CDB_SIZE 32 | |
57 | ||
58 | struct vhost_scsi_inflight { | |
59 | /* Wait for the flush operation to finish */ | |
60 | struct completion comp; | |
61 | /* Refcount for the inflight reqs */ | |
62 | struct kref kref; | |
63 | }; | |
64 | ||
65 | struct tcm_vhost_cmd { | |
66 | /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ | |
67 | int tvc_vq_desc; | |
68 | /* virtio-scsi initiator task attribute */ | |
69 | int tvc_task_attr; | |
70 | /* virtio-scsi initiator data direction */ | |
71 | enum dma_data_direction tvc_data_direction; | |
72 | /* Expected data transfer length from virtio-scsi header */ | |
73 | u32 tvc_exp_data_len; | |
74 | /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ | |
75 | u64 tvc_tag; | |
76 | /* The number of scatterlists associated with this cmd */ | |
77 | u32 tvc_sgl_count; | |
78 | /* Saved unpacked SCSI LUN for tcm_vhost_submission_work() */ | |
79 | u32 tvc_lun; | |
80 | /* Pointer to the SGL formatted memory from virtio-scsi */ | |
81 | struct scatterlist *tvc_sgl; | |
82 | /* Pointer to response */ | |
83 | struct virtio_scsi_cmd_resp __user *tvc_resp; | |
84 | /* Pointer to vhost_scsi for our device */ | |
85 | struct vhost_scsi *tvc_vhost; | |
86 | /* Pointer to vhost_virtqueue for the cmd */ | |
87 | struct vhost_virtqueue *tvc_vq; | |
88 | /* Pointer to vhost nexus memory */ | |
89 | struct tcm_vhost_nexus *tvc_nexus; | |
90 | /* The TCM I/O descriptor that is accessed via container_of() */ | |
91 | struct se_cmd tvc_se_cmd; | |
92 | /* work item used for cmwq dispatch to tcm_vhost_submission_work() */ | |
93 | struct work_struct work; | |
94 | /* Copy of the incoming SCSI command descriptor block (CDB) */ | |
95 | unsigned char tvc_cdb[TCM_VHOST_MAX_CDB_SIZE]; | |
96 | /* Sense buffer that will be mapped into outgoing status */ | |
97 | unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; | |
98 | /* Completed commands list, serviced from vhost worker thread */ | |
99 | struct llist_node tvc_completion_list; | |
100 | /* Used to track inflight cmd */ | |
101 | struct vhost_scsi_inflight *inflight; | |
102 | }; | |
103 | ||
104 | struct tcm_vhost_nexus { | |
105 | /* Pointer to TCM session for I_T Nexus */ | |
106 | struct se_session *tvn_se_sess; | |
107 | }; | |
108 | ||
109 | struct tcm_vhost_nacl { | |
110 | /* Binary World Wide unique Port Name for Vhost Initiator port */ | |
111 | u64 iport_wwpn; | |
112 | /* ASCII formatted WWPN for Sas Initiator port */ | |
113 | char iport_name[TCM_VHOST_NAMELEN]; | |
114 | /* Returned by tcm_vhost_make_nodeacl() */ | |
115 | struct se_node_acl se_node_acl; | |
116 | }; | |
117 | ||
5012a3a3 MT |
118 | struct tcm_vhost_tpg { |
119 | /* Vhost port target portal group tag for TCM */ | |
120 | u16 tport_tpgt; | |
121 | /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ | |
122 | int tv_tpg_port_count; | |
123 | /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ | |
124 | int tv_tpg_vhost_count; | |
125 | /* list for tcm_vhost_list */ | |
126 | struct list_head tv_tpg_list; | |
127 | /* Used to protect access for tpg_nexus */ | |
128 | struct mutex tv_tpg_mutex; | |
129 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ | |
130 | struct tcm_vhost_nexus *tpg_nexus; | |
131 | /* Pointer back to tcm_vhost_tport */ | |
132 | struct tcm_vhost_tport *tport; | |
133 | /* Returned by tcm_vhost_make_tpg() */ | |
134 | struct se_portal_group se_tpg; | |
135 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ | |
136 | struct vhost_scsi *vhost_scsi; | |
137 | }; | |
138 | ||
139 | struct tcm_vhost_tport { | |
140 | /* SCSI protocol the tport is providing */ | |
141 | u8 tport_proto_id; | |
142 | /* Binary World Wide unique Port Name for Vhost Target port */ | |
143 | u64 tport_wwpn; | |
144 | /* ASCII formatted WWPN for Vhost Target port */ | |
145 | char tport_name[TCM_VHOST_NAMELEN]; | |
146 | /* Returned by tcm_vhost_make_tport() */ | |
147 | struct se_wwn tport_wwn; | |
148 | }; | |
149 | ||
150 | struct tcm_vhost_evt { | |
151 | /* event to be sent to guest */ | |
152 | struct virtio_scsi_event event; | |
153 | /* event list, serviced from vhost worker thread */ | |
154 | struct llist_node list; | |
155 | }; | |
057cbf49 | 156 | |
101998f6 NB |
157 | enum { |
158 | VHOST_SCSI_VQ_CTL = 0, | |
159 | VHOST_SCSI_VQ_EVT = 1, | |
160 | VHOST_SCSI_VQ_IO = 2, | |
161 | }; | |
162 | ||
5dade710 | 163 | enum { |
a18cc421 | 164 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
5dade710 NB |
165 | }; |
166 | ||
1b7f390e AH |
167 | #define VHOST_SCSI_MAX_TARGET 256 |
168 | #define VHOST_SCSI_MAX_VQ 128 | |
a6c9af87 | 169 | #define VHOST_SCSI_MAX_EVENT 128 |
67e18cf9 | 170 | |
3ab2e420 AH |
171 | struct vhost_scsi_virtqueue { |
172 | struct vhost_virtqueue vq; | |
3dfbff32 MT |
173 | /* |
174 | * Reference counting for inflight reqs, used for flush operation. At | |
175 | * each time, one reference tracks new commands submitted, while we | |
176 | * wait for another one to reach 0. | |
177 | */ | |
f2f0173d | 178 | struct vhost_scsi_inflight inflights[2]; |
3dfbff32 MT |
179 | /* |
180 | * Indicate current inflight in use, protected by vq->mutex. | |
181 | * Writers must also take dev mutex and flush under it. | |
182 | */ | |
f2f0173d | 183 | int inflight_idx; |
3ab2e420 AH |
184 | }; |
185 | ||
057cbf49 | 186 | struct vhost_scsi { |
67e18cf9 | 187 | /* Protected by vhost_scsi->dev.mutex */ |
4f7f46d3 | 188 | struct tcm_vhost_tpg **vs_tpg; |
67e18cf9 | 189 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
67e18cf9 | 190 | |
057cbf49 | 191 | struct vhost_dev dev; |
3ab2e420 | 192 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
057cbf49 NB |
193 | |
194 | struct vhost_work vs_completion_work; /* cmd completion work item */ | |
9d6064a3 | 195 | struct llist_head vs_completion_list; /* cmd completion queue */ |
a6c9af87 AH |
196 | |
197 | struct vhost_work vs_event_work; /* evt injection work item */ | |
198 | struct llist_head vs_event_list; /* evt injection queue */ | |
199 | ||
200 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ | |
201 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ | |
057cbf49 NB |
202 | }; |
203 | ||
204 | /* Local pointer to allocated TCM configfs fabric module */ | |
205 | static struct target_fabric_configfs *tcm_vhost_fabric_configfs; | |
206 | ||
207 | static struct workqueue_struct *tcm_vhost_workqueue; | |
208 | ||
209 | /* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */ | |
210 | static DEFINE_MUTEX(tcm_vhost_mutex); | |
211 | static LIST_HEAD(tcm_vhost_list); | |
212 | ||
765b34fd AH |
213 | static int iov_num_pages(struct iovec *iov) |
214 | { | |
215 | return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) - | |
216 | ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT; | |
217 | } | |
218 | ||
0a1febf7 | 219 | static void tcm_vhost_done_inflight(struct kref *kref) |
f2f0173d AH |
220 | { |
221 | struct vhost_scsi_inflight *inflight; | |
222 | ||
223 | inflight = container_of(kref, struct vhost_scsi_inflight, kref); | |
224 | complete(&inflight->comp); | |
225 | } | |
226 | ||
227 | static void tcm_vhost_init_inflight(struct vhost_scsi *vs, | |
228 | struct vhost_scsi_inflight *old_inflight[]) | |
229 | { | |
230 | struct vhost_scsi_inflight *new_inflight; | |
231 | struct vhost_virtqueue *vq; | |
232 | int idx, i; | |
233 | ||
234 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
235 | vq = &vs->vqs[i].vq; | |
236 | ||
237 | mutex_lock(&vq->mutex); | |
238 | ||
239 | /* store old infight */ | |
240 | idx = vs->vqs[i].inflight_idx; | |
241 | if (old_inflight) | |
242 | old_inflight[i] = &vs->vqs[i].inflights[idx]; | |
243 | ||
244 | /* setup new infight */ | |
245 | vs->vqs[i].inflight_idx = idx ^ 1; | |
246 | new_inflight = &vs->vqs[i].inflights[idx ^ 1]; | |
247 | kref_init(&new_inflight->kref); | |
248 | init_completion(&new_inflight->comp); | |
249 | ||
250 | mutex_unlock(&vq->mutex); | |
251 | } | |
252 | } | |
253 | ||
254 | static struct vhost_scsi_inflight * | |
255 | tcm_vhost_get_inflight(struct vhost_virtqueue *vq) | |
256 | { | |
257 | struct vhost_scsi_inflight *inflight; | |
258 | struct vhost_scsi_virtqueue *svq; | |
259 | ||
260 | svq = container_of(vq, struct vhost_scsi_virtqueue, vq); | |
261 | inflight = &svq->inflights[svq->inflight_idx]; | |
262 | kref_get(&inflight->kref); | |
263 | ||
264 | return inflight; | |
265 | } | |
266 | ||
267 | static void tcm_vhost_put_inflight(struct vhost_scsi_inflight *inflight) | |
268 | { | |
269 | kref_put(&inflight->kref, tcm_vhost_done_inflight); | |
270 | } | |
271 | ||
057cbf49 NB |
272 | static int tcm_vhost_check_true(struct se_portal_group *se_tpg) |
273 | { | |
274 | return 1; | |
275 | } | |
276 | ||
277 | static int tcm_vhost_check_false(struct se_portal_group *se_tpg) | |
278 | { | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static char *tcm_vhost_get_fabric_name(void) | |
283 | { | |
284 | return "vhost"; | |
285 | } | |
286 | ||
287 | static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg) | |
288 | { | |
289 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
290 | struct tcm_vhost_tpg, se_tpg); | |
291 | struct tcm_vhost_tport *tport = tpg->tport; | |
292 | ||
293 | switch (tport->tport_proto_id) { | |
294 | case SCSI_PROTOCOL_SAS: | |
295 | return sas_get_fabric_proto_ident(se_tpg); | |
296 | case SCSI_PROTOCOL_FCP: | |
297 | return fc_get_fabric_proto_ident(se_tpg); | |
298 | case SCSI_PROTOCOL_ISCSI: | |
299 | return iscsi_get_fabric_proto_ident(se_tpg); | |
300 | default: | |
301 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
302 | " SAS emulation\n", tport->tport_proto_id); | |
303 | break; | |
304 | } | |
305 | ||
306 | return sas_get_fabric_proto_ident(se_tpg); | |
307 | } | |
308 | ||
309 | static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg) | |
310 | { | |
311 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
312 | struct tcm_vhost_tpg, se_tpg); | |
313 | struct tcm_vhost_tport *tport = tpg->tport; | |
314 | ||
315 | return &tport->tport_name[0]; | |
316 | } | |
317 | ||
318 | static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg) | |
319 | { | |
320 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
321 | struct tcm_vhost_tpg, se_tpg); | |
322 | return tpg->tport_tpgt; | |
323 | } | |
324 | ||
325 | static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg) | |
326 | { | |
327 | return 1; | |
328 | } | |
329 | ||
683bd967 AH |
330 | static u32 |
331 | tcm_vhost_get_pr_transport_id(struct se_portal_group *se_tpg, | |
332 | struct se_node_acl *se_nacl, | |
333 | struct t10_pr_registration *pr_reg, | |
334 | int *format_code, | |
335 | unsigned char *buf) | |
057cbf49 NB |
336 | { |
337 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
338 | struct tcm_vhost_tpg, se_tpg); | |
339 | struct tcm_vhost_tport *tport = tpg->tport; | |
340 | ||
341 | switch (tport->tport_proto_id) { | |
342 | case SCSI_PROTOCOL_SAS: | |
343 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
344 | format_code, buf); | |
345 | case SCSI_PROTOCOL_FCP: | |
346 | return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
347 | format_code, buf); | |
348 | case SCSI_PROTOCOL_ISCSI: | |
349 | return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
350 | format_code, buf); | |
351 | default: | |
352 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
353 | " SAS emulation\n", tport->tport_proto_id); | |
354 | break; | |
355 | } | |
356 | ||
357 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
358 | format_code, buf); | |
359 | } | |
360 | ||
683bd967 AH |
361 | static u32 |
362 | tcm_vhost_get_pr_transport_id_len(struct se_portal_group *se_tpg, | |
363 | struct se_node_acl *se_nacl, | |
364 | struct t10_pr_registration *pr_reg, | |
365 | int *format_code) | |
057cbf49 NB |
366 | { |
367 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
368 | struct tcm_vhost_tpg, se_tpg); | |
369 | struct tcm_vhost_tport *tport = tpg->tport; | |
370 | ||
371 | switch (tport->tport_proto_id) { | |
372 | case SCSI_PROTOCOL_SAS: | |
373 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
374 | format_code); | |
375 | case SCSI_PROTOCOL_FCP: | |
376 | return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
377 | format_code); | |
378 | case SCSI_PROTOCOL_ISCSI: | |
379 | return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
380 | format_code); | |
381 | default: | |
382 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
383 | " SAS emulation\n", tport->tport_proto_id); | |
384 | break; | |
385 | } | |
386 | ||
387 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
388 | format_code); | |
389 | } | |
390 | ||
683bd967 AH |
391 | static char * |
392 | tcm_vhost_parse_pr_out_transport_id(struct se_portal_group *se_tpg, | |
393 | const char *buf, | |
394 | u32 *out_tid_len, | |
395 | char **port_nexus_ptr) | |
057cbf49 NB |
396 | { |
397 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
398 | struct tcm_vhost_tpg, se_tpg); | |
399 | struct tcm_vhost_tport *tport = tpg->tport; | |
400 | ||
401 | switch (tport->tport_proto_id) { | |
402 | case SCSI_PROTOCOL_SAS: | |
403 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
404 | port_nexus_ptr); | |
405 | case SCSI_PROTOCOL_FCP: | |
406 | return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
407 | port_nexus_ptr); | |
408 | case SCSI_PROTOCOL_ISCSI: | |
409 | return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
410 | port_nexus_ptr); | |
411 | default: | |
412 | pr_err("Unknown tport_proto_id: 0x%02x, using" | |
413 | " SAS emulation\n", tport->tport_proto_id); | |
414 | break; | |
415 | } | |
416 | ||
417 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
418 | port_nexus_ptr); | |
419 | } | |
420 | ||
683bd967 AH |
421 | static struct se_node_acl * |
422 | tcm_vhost_alloc_fabric_acl(struct se_portal_group *se_tpg) | |
057cbf49 NB |
423 | { |
424 | struct tcm_vhost_nacl *nacl; | |
425 | ||
426 | nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL); | |
427 | if (!nacl) { | |
744627e9 | 428 | pr_err("Unable to allocate struct tcm_vhost_nacl\n"); |
057cbf49 NB |
429 | return NULL; |
430 | } | |
431 | ||
432 | return &nacl->se_node_acl; | |
433 | } | |
434 | ||
683bd967 AH |
435 | static void |
436 | tcm_vhost_release_fabric_acl(struct se_portal_group *se_tpg, | |
437 | struct se_node_acl *se_nacl) | |
057cbf49 NB |
438 | { |
439 | struct tcm_vhost_nacl *nacl = container_of(se_nacl, | |
440 | struct tcm_vhost_nacl, se_node_acl); | |
441 | kfree(nacl); | |
442 | } | |
443 | ||
444 | static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg) | |
445 | { | |
446 | return 1; | |
447 | } | |
448 | ||
449 | static void tcm_vhost_release_cmd(struct se_cmd *se_cmd) | |
450 | { | |
451 | return; | |
452 | } | |
453 | ||
454 | static int tcm_vhost_shutdown_session(struct se_session *se_sess) | |
455 | { | |
456 | return 0; | |
457 | } | |
458 | ||
459 | static void tcm_vhost_close_session(struct se_session *se_sess) | |
460 | { | |
461 | return; | |
462 | } | |
463 | ||
464 | static u32 tcm_vhost_sess_get_index(struct se_session *se_sess) | |
465 | { | |
466 | return 0; | |
467 | } | |
468 | ||
469 | static int tcm_vhost_write_pending(struct se_cmd *se_cmd) | |
470 | { | |
471 | /* Go ahead and process the write immediately */ | |
472 | target_execute_cmd(se_cmd); | |
473 | return 0; | |
474 | } | |
475 | ||
476 | static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd) | |
477 | { | |
478 | return 0; | |
479 | } | |
480 | ||
481 | static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl) | |
482 | { | |
483 | return; | |
484 | } | |
485 | ||
486 | static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd) | |
487 | { | |
488 | return 0; | |
489 | } | |
490 | ||
491 | static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd) | |
492 | { | |
493 | return 0; | |
494 | } | |
495 | ||
3c63f66a | 496 | static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *cmd) |
101998f6 | 497 | { |
3c63f66a | 498 | struct vhost_scsi *vs = cmd->tvc_vhost; |
101998f6 | 499 | |
3c63f66a | 500 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
101998f6 NB |
501 | |
502 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); | |
503 | } | |
057cbf49 NB |
504 | |
505 | static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd) | |
506 | { | |
3c63f66a | 507 | struct tcm_vhost_cmd *cmd = container_of(se_cmd, |
057cbf49 | 508 | struct tcm_vhost_cmd, tvc_se_cmd); |
3c63f66a | 509 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
510 | return 0; |
511 | } | |
512 | ||
513 | static int tcm_vhost_queue_status(struct se_cmd *se_cmd) | |
514 | { | |
3c63f66a | 515 | struct tcm_vhost_cmd *cmd = container_of(se_cmd, |
057cbf49 | 516 | struct tcm_vhost_cmd, tvc_se_cmd); |
3c63f66a | 517 | vhost_scsi_complete_cmd(cmd); |
057cbf49 NB |
518 | return 0; |
519 | } | |
520 | ||
521 | static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd) | |
522 | { | |
523 | return 0; | |
524 | } | |
525 | ||
a6c9af87 AH |
526 | static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt) |
527 | { | |
528 | vs->vs_events_nr--; | |
529 | kfree(evt); | |
530 | } | |
531 | ||
683bd967 AH |
532 | static struct tcm_vhost_evt * |
533 | tcm_vhost_allocate_evt(struct vhost_scsi *vs, | |
534 | u32 event, u32 reason) | |
a6c9af87 | 535 | { |
3ab2e420 | 536 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
537 | struct tcm_vhost_evt *evt; |
538 | ||
539 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { | |
540 | vs->vs_events_missed = true; | |
541 | return NULL; | |
542 | } | |
543 | ||
544 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); | |
545 | if (!evt) { | |
546 | vq_err(vq, "Failed to allocate tcm_vhost_evt\n"); | |
547 | vs->vs_events_missed = true; | |
548 | return NULL; | |
549 | } | |
550 | ||
551 | evt->event.event = event; | |
552 | evt->event.reason = reason; | |
553 | vs->vs_events_nr++; | |
554 | ||
555 | return evt; | |
556 | } | |
557 | ||
3c63f66a | 558 | static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *cmd) |
057cbf49 | 559 | { |
3c63f66a | 560 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
561 | |
562 | /* TODO locking against target/backend threads? */ | |
563 | transport_generic_free_cmd(se_cmd, 1); | |
564 | ||
3c63f66a | 565 | if (cmd->tvc_sgl_count) { |
057cbf49 | 566 | u32 i; |
3c63f66a AH |
567 | for (i = 0; i < cmd->tvc_sgl_count; i++) |
568 | put_page(sg_page(&cmd->tvc_sgl[i])); | |
057cbf49 | 569 | |
3c63f66a | 570 | kfree(cmd->tvc_sgl); |
057cbf49 NB |
571 | } |
572 | ||
3c63f66a | 573 | tcm_vhost_put_inflight(cmd->inflight); |
f2f0173d | 574 | |
3c63f66a | 575 | kfree(cmd); |
057cbf49 NB |
576 | } |
577 | ||
683bd967 AH |
578 | static void |
579 | tcm_vhost_do_evt_work(struct vhost_scsi *vs, struct tcm_vhost_evt *evt) | |
a6c9af87 | 580 | { |
3ab2e420 | 581 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
582 | struct virtio_scsi_event *event = &evt->event; |
583 | struct virtio_scsi_event __user *eventp; | |
584 | unsigned out, in; | |
585 | int head, ret; | |
586 | ||
587 | if (!vq->private_data) { | |
588 | vs->vs_events_missed = true; | |
589 | return; | |
590 | } | |
591 | ||
592 | again: | |
593 | vhost_disable_notify(&vs->dev, vq); | |
594 | head = vhost_get_vq_desc(&vs->dev, vq, vq->iov, | |
595 | ARRAY_SIZE(vq->iov), &out, &in, | |
596 | NULL, NULL); | |
597 | if (head < 0) { | |
598 | vs->vs_events_missed = true; | |
599 | return; | |
600 | } | |
601 | if (head == vq->num) { | |
602 | if (vhost_enable_notify(&vs->dev, vq)) | |
603 | goto again; | |
604 | vs->vs_events_missed = true; | |
605 | return; | |
606 | } | |
607 | ||
608 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { | |
609 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", | |
610 | vq->iov[out].iov_len); | |
611 | vs->vs_events_missed = true; | |
612 | return; | |
613 | } | |
614 | ||
615 | if (vs->vs_events_missed) { | |
616 | event->event |= VIRTIO_SCSI_T_EVENTS_MISSED; | |
617 | vs->vs_events_missed = false; | |
618 | } | |
619 | ||
620 | eventp = vq->iov[out].iov_base; | |
621 | ret = __copy_to_user(eventp, event, sizeof(*event)); | |
622 | if (!ret) | |
623 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
624 | else | |
625 | vq_err(vq, "Faulted on tcm_vhost_send_event\n"); | |
626 | } | |
627 | ||
628 | static void tcm_vhost_evt_work(struct vhost_work *work) | |
629 | { | |
630 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
631 | vs_event_work); | |
3ab2e420 | 632 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
633 | struct tcm_vhost_evt *evt; |
634 | struct llist_node *llnode; | |
635 | ||
636 | mutex_lock(&vq->mutex); | |
637 | llnode = llist_del_all(&vs->vs_event_list); | |
638 | while (llnode) { | |
639 | evt = llist_entry(llnode, struct tcm_vhost_evt, list); | |
640 | llnode = llist_next(llnode); | |
641 | tcm_vhost_do_evt_work(vs, evt); | |
642 | tcm_vhost_free_evt(vs, evt); | |
643 | } | |
644 | mutex_unlock(&vq->mutex); | |
645 | } | |
646 | ||
057cbf49 NB |
647 | /* Fill in status and signal that we are done processing this command |
648 | * | |
649 | * This is scheduled in the vhost work queue so we are called with the owner | |
650 | * process mm and can access the vring. | |
651 | */ | |
652 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) | |
653 | { | |
654 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, | |
655 | vs_completion_work); | |
1b7f390e | 656 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 | 657 | struct virtio_scsi_cmd_resp v_rsp; |
3c63f66a | 658 | struct tcm_vhost_cmd *cmd; |
9d6064a3 AH |
659 | struct llist_node *llnode; |
660 | struct se_cmd *se_cmd; | |
1b7f390e | 661 | int ret, vq; |
057cbf49 | 662 | |
1b7f390e | 663 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
9d6064a3 AH |
664 | llnode = llist_del_all(&vs->vs_completion_list); |
665 | while (llnode) { | |
3c63f66a | 666 | cmd = llist_entry(llnode, struct tcm_vhost_cmd, |
9d6064a3 AH |
667 | tvc_completion_list); |
668 | llnode = llist_next(llnode); | |
3c63f66a | 669 | se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
670 | |
671 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, | |
3c63f66a | 672 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
057cbf49 NB |
673 | |
674 | memset(&v_rsp, 0, sizeof(v_rsp)); | |
675 | v_rsp.resid = se_cmd->residual_count; | |
676 | /* TODO is status_qualifier field needed? */ | |
677 | v_rsp.status = se_cmd->scsi_status; | |
678 | v_rsp.sense_len = se_cmd->scsi_sense_length; | |
3c63f66a | 679 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
057cbf49 | 680 | v_rsp.sense_len); |
3c63f66a | 681 | ret = copy_to_user(cmd->tvc_resp, &v_rsp, sizeof(v_rsp)); |
1b7f390e | 682 | if (likely(ret == 0)) { |
3ab2e420 | 683 | struct vhost_scsi_virtqueue *q; |
3c63f66a AH |
684 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
685 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); | |
3ab2e420 | 686 | vq = q - vs->vqs; |
1b7f390e AH |
687 | __set_bit(vq, signal); |
688 | } else | |
057cbf49 NB |
689 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
690 | ||
3c63f66a | 691 | vhost_scsi_free_cmd(cmd); |
057cbf49 NB |
692 | } |
693 | ||
1b7f390e AH |
694 | vq = -1; |
695 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) | |
696 | < VHOST_SCSI_MAX_VQ) | |
3ab2e420 | 697 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
057cbf49 NB |
698 | } |
699 | ||
683bd967 AH |
700 | static struct tcm_vhost_cmd * |
701 | vhost_scsi_allocate_cmd(struct vhost_virtqueue *vq, | |
98718312 | 702 | struct tcm_vhost_tpg *tpg, |
683bd967 AH |
703 | struct virtio_scsi_cmd_req *v_req, |
704 | u32 exp_data_len, | |
705 | int data_direction) | |
057cbf49 | 706 | { |
3c63f66a | 707 | struct tcm_vhost_cmd *cmd; |
057cbf49 | 708 | struct tcm_vhost_nexus *tv_nexus; |
057cbf49 | 709 | |
98718312 | 710 | tv_nexus = tpg->tpg_nexus; |
057cbf49 NB |
711 | if (!tv_nexus) { |
712 | pr_err("Unable to locate active struct tcm_vhost_nexus\n"); | |
713 | return ERR_PTR(-EIO); | |
714 | } | |
057cbf49 | 715 | |
3c63f66a AH |
716 | cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC); |
717 | if (!cmd) { | |
057cbf49 NB |
718 | pr_err("Unable to allocate struct tcm_vhost_cmd\n"); |
719 | return ERR_PTR(-ENOMEM); | |
720 | } | |
3c63f66a AH |
721 | cmd->tvc_tag = v_req->tag; |
722 | cmd->tvc_task_attr = v_req->task_attr; | |
723 | cmd->tvc_exp_data_len = exp_data_len; | |
724 | cmd->tvc_data_direction = data_direction; | |
725 | cmd->tvc_nexus = tv_nexus; | |
726 | cmd->inflight = tcm_vhost_get_inflight(vq); | |
727 | ||
728 | return cmd; | |
057cbf49 NB |
729 | } |
730 | ||
731 | /* | |
732 | * Map a user memory range into a scatterlist | |
733 | * | |
734 | * Returns the number of scatterlist entries used or -errno on error. | |
735 | */ | |
683bd967 AH |
736 | static int |
737 | vhost_scsi_map_to_sgl(struct scatterlist *sgl, | |
738 | unsigned int sgl_count, | |
739 | struct iovec *iov, | |
740 | int write) | |
057cbf49 | 741 | { |
1810053e | 742 | unsigned int npages = 0, pages_nr, offset, nbytes; |
057cbf49 | 743 | struct scatterlist *sg = sgl; |
1810053e AH |
744 | void __user *ptr = iov->iov_base; |
745 | size_t len = iov->iov_len; | |
746 | struct page **pages; | |
747 | int ret, i; | |
057cbf49 | 748 | |
1810053e AH |
749 | pages_nr = iov_num_pages(iov); |
750 | if (pages_nr > sgl_count) | |
751 | return -ENOBUFS; | |
057cbf49 | 752 | |
1810053e AH |
753 | pages = kmalloc(pages_nr * sizeof(struct page *), GFP_KERNEL); |
754 | if (!pages) | |
755 | return -ENOMEM; | |
057cbf49 | 756 | |
1810053e AH |
757 | ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages); |
758 | /* No pages were pinned */ | |
759 | if (ret < 0) | |
760 | goto out; | |
761 | /* Less pages pinned than wanted */ | |
762 | if (ret != pages_nr) { | |
763 | for (i = 0; i < ret; i++) | |
764 | put_page(pages[i]); | |
765 | ret = -EFAULT; | |
766 | goto out; | |
767 | } | |
768 | ||
769 | while (len > 0) { | |
770 | offset = (uintptr_t)ptr & ~PAGE_MASK; | |
771 | nbytes = min_t(unsigned int, PAGE_SIZE - offset, len); | |
772 | sg_set_page(sg, pages[npages], nbytes, offset); | |
057cbf49 NB |
773 | ptr += nbytes; |
774 | len -= nbytes; | |
775 | sg++; | |
776 | npages++; | |
777 | } | |
057cbf49 | 778 | |
1810053e AH |
779 | out: |
780 | kfree(pages); | |
057cbf49 NB |
781 | return ret; |
782 | } | |
783 | ||
683bd967 | 784 | static int |
3c63f66a | 785 | vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd, |
683bd967 AH |
786 | struct iovec *iov, |
787 | unsigned int niov, | |
788 | int write) | |
057cbf49 NB |
789 | { |
790 | int ret; | |
791 | unsigned int i; | |
792 | u32 sgl_count; | |
793 | struct scatterlist *sg; | |
794 | ||
795 | /* | |
796 | * Find out how long sglist needs to be | |
797 | */ | |
798 | sgl_count = 0; | |
f3158f36 AH |
799 | for (i = 0; i < niov; i++) |
800 | sgl_count += iov_num_pages(&iov[i]); | |
801 | ||
057cbf49 NB |
802 | /* TODO overflow checking */ |
803 | ||
3c63f66a | 804 | sg = kmalloc(sizeof(cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC); |
057cbf49 NB |
805 | if (!sg) |
806 | return -ENOMEM; | |
f0e0e9bb FW |
807 | pr_debug("%s sg %p sgl_count %u is_err %d\n", __func__, |
808 | sg, sgl_count, !sg); | |
057cbf49 NB |
809 | sg_init_table(sg, sgl_count); |
810 | ||
3c63f66a AH |
811 | cmd->tvc_sgl = sg; |
812 | cmd->tvc_sgl_count = sgl_count; | |
057cbf49 NB |
813 | |
814 | pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count); | |
815 | for (i = 0; i < niov; i++) { | |
1810053e | 816 | ret = vhost_scsi_map_to_sgl(sg, sgl_count, &iov[i], write); |
057cbf49 | 817 | if (ret < 0) { |
3c63f66a AH |
818 | for (i = 0; i < cmd->tvc_sgl_count; i++) |
819 | put_page(sg_page(&cmd->tvc_sgl[i])); | |
820 | kfree(cmd->tvc_sgl); | |
821 | cmd->tvc_sgl = NULL; | |
822 | cmd->tvc_sgl_count = 0; | |
057cbf49 NB |
823 | return ret; |
824 | } | |
825 | ||
826 | sg += ret; | |
827 | sgl_count -= ret; | |
828 | } | |
829 | return 0; | |
830 | } | |
831 | ||
832 | static void tcm_vhost_submission_work(struct work_struct *work) | |
833 | { | |
3c63f66a | 834 | struct tcm_vhost_cmd *cmd = |
057cbf49 | 835 | container_of(work, struct tcm_vhost_cmd, work); |
9f0abc15 | 836 | struct tcm_vhost_nexus *tv_nexus; |
3c63f66a | 837 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
057cbf49 NB |
838 | struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL; |
839 | int rc, sg_no_bidi = 0; | |
057cbf49 | 840 | |
3c63f66a AH |
841 | if (cmd->tvc_sgl_count) { |
842 | sg_ptr = cmd->tvc_sgl; | |
057cbf49 NB |
843 | /* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */ |
844 | #if 0 | |
845 | if (se_cmd->se_cmd_flags & SCF_BIDI) { | |
846 | sg_bidi_ptr = NULL; | |
847 | sg_no_bidi = 0; | |
848 | } | |
849 | #endif | |
850 | } else { | |
851 | sg_ptr = NULL; | |
852 | } | |
3c63f66a | 853 | tv_nexus = cmd->tvc_nexus; |
9f0abc15 NB |
854 | |
855 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, | |
3c63f66a AH |
856 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
857 | cmd->tvc_lun, cmd->tvc_exp_data_len, | |
858 | cmd->tvc_task_attr, cmd->tvc_data_direction, | |
859 | 0, sg_ptr, cmd->tvc_sgl_count, | |
9f0abc15 | 860 | sg_bidi_ptr, sg_no_bidi); |
057cbf49 NB |
861 | if (rc < 0) { |
862 | transport_send_check_condition_and_sense(se_cmd, | |
9f0abc15 | 863 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
057cbf49 | 864 | transport_generic_free_cmd(se_cmd, 0); |
057cbf49 | 865 | } |
057cbf49 NB |
866 | } |
867 | ||
683bd967 AH |
868 | static void |
869 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, | |
870 | struct vhost_virtqueue *vq, | |
871 | int head, unsigned out) | |
637ab21e AH |
872 | { |
873 | struct virtio_scsi_cmd_resp __user *resp; | |
874 | struct virtio_scsi_cmd_resp rsp; | |
875 | int ret; | |
876 | ||
877 | memset(&rsp, 0, sizeof(rsp)); | |
878 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; | |
879 | resp = vq->iov[out].iov_base; | |
880 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); | |
881 | if (!ret) | |
882 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); | |
883 | else | |
884 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); | |
885 | } | |
886 | ||
683bd967 AH |
887 | static void |
888 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) | |
057cbf49 | 889 | { |
4f7f46d3 | 890 | struct tcm_vhost_tpg **vs_tpg; |
057cbf49 | 891 | struct virtio_scsi_cmd_req v_req; |
98718312 | 892 | struct tcm_vhost_tpg *tpg; |
3c63f66a | 893 | struct tcm_vhost_cmd *cmd; |
057cbf49 NB |
894 | u32 exp_data_len, data_first, data_num, data_direction; |
895 | unsigned out, in, i; | |
896 | int head, ret; | |
67e18cf9 | 897 | u8 target; |
057cbf49 | 898 | |
4f7f46d3 AH |
899 | /* |
900 | * We can handle the vq only after the endpoint is setup by calling the | |
901 | * VHOST_SCSI_SET_ENDPOINT ioctl. | |
902 | * | |
903 | * TODO: Check that we are running from vhost_worker which acts | |
904 | * as read-side critical section for vhost kind of RCU. | |
905 | * See the comments in struct vhost_virtqueue in drivers/vhost/vhost.h | |
906 | */ | |
907 | vs_tpg = rcu_dereference_check(vq->private_data, 1); | |
908 | if (!vs_tpg) | |
057cbf49 | 909 | return; |
057cbf49 NB |
910 | |
911 | mutex_lock(&vq->mutex); | |
912 | vhost_disable_notify(&vs->dev, vq); | |
913 | ||
914 | for (;;) { | |
915 | head = vhost_get_vq_desc(&vs->dev, vq, vq->iov, | |
916 | ARRAY_SIZE(vq->iov), &out, &in, | |
917 | NULL, NULL); | |
918 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", | |
919 | head, out, in); | |
920 | /* On error, stop handling until the next kick. */ | |
921 | if (unlikely(head < 0)) | |
922 | break; | |
923 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
924 | if (head == vq->num) { | |
925 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { | |
926 | vhost_disable_notify(&vs->dev, vq); | |
927 | continue; | |
928 | } | |
929 | break; | |
930 | } | |
931 | ||
932 | /* FIXME: BIDI operation */ | |
933 | if (out == 1 && in == 1) { | |
934 | data_direction = DMA_NONE; | |
935 | data_first = 0; | |
936 | data_num = 0; | |
937 | } else if (out == 1 && in > 1) { | |
938 | data_direction = DMA_FROM_DEVICE; | |
939 | data_first = out + 1; | |
940 | data_num = in - 1; | |
941 | } else if (out > 1 && in == 1) { | |
942 | data_direction = DMA_TO_DEVICE; | |
943 | data_first = 1; | |
944 | data_num = out - 1; | |
945 | } else { | |
946 | vq_err(vq, "Invalid buffer layout out: %u in: %u\n", | |
947 | out, in); | |
948 | break; | |
949 | } | |
950 | ||
951 | /* | |
952 | * Check for a sane resp buffer so we can report errors to | |
953 | * the guest. | |
954 | */ | |
955 | if (unlikely(vq->iov[out].iov_len != | |
956 | sizeof(struct virtio_scsi_cmd_resp))) { | |
957 | vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu" | |
958 | " bytes\n", vq->iov[out].iov_len); | |
959 | break; | |
960 | } | |
961 | ||
962 | if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) { | |
963 | vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu" | |
964 | " bytes\n", vq->iov[0].iov_len); | |
965 | break; | |
966 | } | |
967 | pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p," | |
968 | " len: %zu\n", vq->iov[0].iov_base, sizeof(v_req)); | |
969 | ret = __copy_from_user(&v_req, vq->iov[0].iov_base, | |
970 | sizeof(v_req)); | |
971 | if (unlikely(ret)) { | |
972 | vq_err(vq, "Faulted on virtio_scsi_cmd_req\n"); | |
973 | break; | |
974 | } | |
975 | ||
67e18cf9 AH |
976 | /* Extract the tpgt */ |
977 | target = v_req.lun[1]; | |
98718312 | 978 | tpg = ACCESS_ONCE(vs_tpg[target]); |
67e18cf9 AH |
979 | |
980 | /* Target does not exist, fail the request */ | |
98718312 | 981 | if (unlikely(!tpg)) { |
637ab21e | 982 | vhost_scsi_send_bad_target(vs, vq, head, out); |
67e18cf9 AH |
983 | continue; |
984 | } | |
985 | ||
057cbf49 NB |
986 | exp_data_len = 0; |
987 | for (i = 0; i < data_num; i++) | |
988 | exp_data_len += vq->iov[data_first + i].iov_len; | |
989 | ||
3c63f66a | 990 | cmd = vhost_scsi_allocate_cmd(vq, tpg, &v_req, |
057cbf49 | 991 | exp_data_len, data_direction); |
3c63f66a | 992 | if (IS_ERR(cmd)) { |
057cbf49 | 993 | vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n", |
3c63f66a | 994 | PTR_ERR(cmd)); |
055f648c | 995 | goto err_cmd; |
057cbf49 NB |
996 | } |
997 | pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction" | |
3c63f66a | 998 | ": %d\n", cmd, exp_data_len, data_direction); |
057cbf49 | 999 | |
3c63f66a AH |
1000 | cmd->tvc_vhost = vs; |
1001 | cmd->tvc_vq = vq; | |
1002 | cmd->tvc_resp = vq->iov[out].iov_base; | |
057cbf49 NB |
1003 | |
1004 | /* | |
3c63f66a | 1005 | * Copy in the recieved CDB descriptor into cmd->tvc_cdb |
057cbf49 NB |
1006 | * that will be used by tcm_vhost_new_cmd_map() and down into |
1007 | * target_setup_cmd_from_cdb() | |
1008 | */ | |
3c63f66a | 1009 | memcpy(cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE); |
057cbf49 NB |
1010 | /* |
1011 | * Check that the recieved CDB size does not exceeded our | |
1012 | * hardcoded max for tcm_vhost | |
1013 | */ | |
1014 | /* TODO what if cdb was too small for varlen cdb header? */ | |
3c63f66a | 1015 | if (unlikely(scsi_command_size(cmd->tvc_cdb) > |
057cbf49 NB |
1016 | TCM_VHOST_MAX_CDB_SIZE)) { |
1017 | vq_err(vq, "Received SCSI CDB with command_size: %d that" | |
1018 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", | |
3c63f66a | 1019 | scsi_command_size(cmd->tvc_cdb), |
057cbf49 | 1020 | TCM_VHOST_MAX_CDB_SIZE); |
055f648c | 1021 | goto err_free; |
057cbf49 | 1022 | } |
3c63f66a | 1023 | cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; |
057cbf49 NB |
1024 | |
1025 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", | |
3c63f66a | 1026 | cmd->tvc_cdb[0], cmd->tvc_lun); |
057cbf49 NB |
1027 | |
1028 | if (data_direction != DMA_NONE) { | |
3c63f66a | 1029 | ret = vhost_scsi_map_iov_to_sgl(cmd, |
057cbf49 NB |
1030 | &vq->iov[data_first], data_num, |
1031 | data_direction == DMA_TO_DEVICE); | |
1032 | if (unlikely(ret)) { | |
1033 | vq_err(vq, "Failed to map iov to sgl\n"); | |
055f648c | 1034 | goto err_free; |
057cbf49 NB |
1035 | } |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Save the descriptor from vhost_get_vq_desc() to be used to | |
1040 | * complete the virtio-scsi request in TCM callback context via | |
1041 | * tcm_vhost_queue_data_in() and tcm_vhost_queue_status() | |
1042 | */ | |
3c63f66a | 1043 | cmd->tvc_vq_desc = head; |
057cbf49 NB |
1044 | /* |
1045 | * Dispatch tv_cmd descriptor for cmwq execution in process | |
1046 | * context provided by tcm_vhost_workqueue. This also ensures | |
1047 | * tv_cmd is executed on the same kworker CPU as this vhost | |
1048 | * thread to gain positive L2 cache locality effects.. | |
1049 | */ | |
3c63f66a AH |
1050 | INIT_WORK(&cmd->work, tcm_vhost_submission_work); |
1051 | queue_work(tcm_vhost_workqueue, &cmd->work); | |
057cbf49 NB |
1052 | } |
1053 | ||
1054 | mutex_unlock(&vq->mutex); | |
7ea206cf AH |
1055 | return; |
1056 | ||
055f648c | 1057 | err_free: |
3c63f66a | 1058 | vhost_scsi_free_cmd(cmd); |
055f648c AH |
1059 | err_cmd: |
1060 | vhost_scsi_send_bad_target(vs, vq, head, out); | |
7ea206cf | 1061 | mutex_unlock(&vq->mutex); |
057cbf49 NB |
1062 | } |
1063 | ||
1064 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) | |
1065 | { | |
101998f6 | 1066 | pr_debug("%s: The handling func for control queue.\n", __func__); |
057cbf49 NB |
1067 | } |
1068 | ||
683bd967 AH |
1069 | static void |
1070 | tcm_vhost_send_evt(struct vhost_scsi *vs, | |
1071 | struct tcm_vhost_tpg *tpg, | |
1072 | struct se_lun *lun, | |
1073 | u32 event, | |
1074 | u32 reason) | |
a6c9af87 AH |
1075 | { |
1076 | struct tcm_vhost_evt *evt; | |
1077 | ||
1078 | evt = tcm_vhost_allocate_evt(vs, event, reason); | |
1079 | if (!evt) | |
1080 | return; | |
1081 | ||
1082 | if (tpg && lun) { | |
1083 | /* TODO: share lun setup code with virtio-scsi.ko */ | |
1084 | /* | |
1085 | * Note: evt->event is zeroed when we allocate it and | |
1086 | * lun[4-7] need to be zero according to virtio-scsi spec. | |
1087 | */ | |
1088 | evt->event.lun[0] = 0x01; | |
1089 | evt->event.lun[1] = tpg->tport_tpgt & 0xFF; | |
1090 | if (lun->unpacked_lun >= 256) | |
1091 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; | |
1092 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; | |
1093 | } | |
1094 | ||
1095 | llist_add(&evt->list, &vs->vs_event_list); | |
1096 | vhost_work_queue(&vs->dev, &vs->vs_event_work); | |
1097 | } | |
1098 | ||
057cbf49 NB |
1099 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
1100 | { | |
a6c9af87 AH |
1101 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1102 | poll.work); | |
1103 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1104 | ||
1105 | mutex_lock(&vq->mutex); | |
1106 | if (!vq->private_data) | |
1107 | goto out; | |
1108 | ||
1109 | if (vs->vs_events_missed) | |
1110 | tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); | |
1111 | out: | |
1112 | mutex_unlock(&vq->mutex); | |
057cbf49 NB |
1113 | } |
1114 | ||
1115 | static void vhost_scsi_handle_kick(struct vhost_work *work) | |
1116 | { | |
1117 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
1118 | poll.work); | |
1119 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); | |
1120 | ||
1b7f390e | 1121 | vhost_scsi_handle_vq(vs, vq); |
057cbf49 NB |
1122 | } |
1123 | ||
4f7f46d3 AH |
1124 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
1125 | { | |
3ab2e420 | 1126 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
4f7f46d3 AH |
1127 | } |
1128 | ||
3dfbff32 | 1129 | /* Callers must hold dev mutex */ |
4f7f46d3 AH |
1130 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
1131 | { | |
f2f0173d | 1132 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
4f7f46d3 AH |
1133 | int i; |
1134 | ||
f2f0173d AH |
1135 | /* Init new inflight and remember the old inflight */ |
1136 | tcm_vhost_init_inflight(vs, old_inflight); | |
1137 | ||
1138 | /* | |
1139 | * The inflight->kref was initialized to 1. We decrement it here to | |
1140 | * indicate the start of the flush operation so that it will reach 0 | |
1141 | * when all the reqs are finished. | |
1142 | */ | |
1143 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1144 | kref_put(&old_inflight[i]->kref, tcm_vhost_done_inflight); | |
1145 | ||
1146 | /* Flush both the vhost poll and vhost work */ | |
4f7f46d3 AH |
1147 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
1148 | vhost_scsi_flush_vq(vs, i); | |
1149 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); | |
a6c9af87 | 1150 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
f2f0173d AH |
1151 | |
1152 | /* Wait for all reqs issued before the flush to be finished */ | |
1153 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) | |
1154 | wait_for_completion(&old_inflight[i]->comp); | |
4f7f46d3 AH |
1155 | } |
1156 | ||
057cbf49 NB |
1157 | /* |
1158 | * Called from vhost_scsi_ioctl() context to walk the list of available | |
1159 | * tcm_vhost_tpg with an active struct tcm_vhost_nexus | |
f2b7daf5 AH |
1160 | * |
1161 | * The lock nesting rule is: | |
1162 | * tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex | |
057cbf49 | 1163 | */ |
683bd967 AH |
1164 | static int |
1165 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, | |
1166 | struct vhost_scsi_target *t) | |
057cbf49 NB |
1167 | { |
1168 | struct tcm_vhost_tport *tv_tport; | |
98718312 | 1169 | struct tcm_vhost_tpg *tpg; |
4f7f46d3 AH |
1170 | struct tcm_vhost_tpg **vs_tpg; |
1171 | struct vhost_virtqueue *vq; | |
1172 | int index, ret, i, len; | |
67e18cf9 | 1173 | bool match = false; |
057cbf49 | 1174 | |
f2b7daf5 | 1175 | mutex_lock(&tcm_vhost_mutex); |
057cbf49 | 1176 | mutex_lock(&vs->dev.mutex); |
f2b7daf5 | 1177 | |
057cbf49 NB |
1178 | /* Verify that ring has been setup correctly. */ |
1179 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
1180 | /* Verify that ring has been setup correctly. */ | |
3ab2e420 | 1181 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
f2b7daf5 AH |
1182 | ret = -EFAULT; |
1183 | goto out; | |
057cbf49 NB |
1184 | } |
1185 | } | |
057cbf49 | 1186 | |
4f7f46d3 AH |
1187 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
1188 | vs_tpg = kzalloc(len, GFP_KERNEL); | |
1189 | if (!vs_tpg) { | |
f2b7daf5 AH |
1190 | ret = -ENOMEM; |
1191 | goto out; | |
4f7f46d3 AH |
1192 | } |
1193 | if (vs->vs_tpg) | |
1194 | memcpy(vs_tpg, vs->vs_tpg, len); | |
1195 | ||
98718312 AH |
1196 | list_for_each_entry(tpg, &tcm_vhost_list, tv_tpg_list) { |
1197 | mutex_lock(&tpg->tv_tpg_mutex); | |
1198 | if (!tpg->tpg_nexus) { | |
1199 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1200 | continue; |
1201 | } | |
98718312 AH |
1202 | if (tpg->tv_tpg_vhost_count != 0) { |
1203 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 NB |
1204 | continue; |
1205 | } | |
98718312 | 1206 | tv_tport = tpg->tport; |
057cbf49 | 1207 | |
67e18cf9 | 1208 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
98718312 | 1209 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
4f7f46d3 | 1210 | kfree(vs_tpg); |
98718312 | 1211 | mutex_unlock(&tpg->tv_tpg_mutex); |
f2b7daf5 AH |
1212 | ret = -EEXIST; |
1213 | goto out; | |
101998f6 | 1214 | } |
98718312 AH |
1215 | tpg->tv_tpg_vhost_count++; |
1216 | tpg->vhost_scsi = vs; | |
1217 | vs_tpg[tpg->tport_tpgt] = tpg; | |
057cbf49 | 1218 | smp_mb__after_atomic_inc(); |
67e18cf9 | 1219 | match = true; |
057cbf49 | 1220 | } |
98718312 | 1221 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1222 | } |
67e18cf9 AH |
1223 | |
1224 | if (match) { | |
1225 | memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn, | |
1226 | sizeof(vs->vs_vhost_wwpn)); | |
4f7f46d3 | 1227 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
3ab2e420 | 1228 | vq = &vs->vqs[i].vq; |
4f7f46d3 AH |
1229 | /* Flushing the vhost_work acts as synchronize_rcu */ |
1230 | mutex_lock(&vq->mutex); | |
1231 | rcu_assign_pointer(vq->private_data, vs_tpg); | |
dfd5d569 | 1232 | vhost_init_used(vq); |
4f7f46d3 AH |
1233 | mutex_unlock(&vq->mutex); |
1234 | } | |
67e18cf9 AH |
1235 | ret = 0; |
1236 | } else { | |
1237 | ret = -EEXIST; | |
1238 | } | |
1239 | ||
4f7f46d3 AH |
1240 | /* |
1241 | * Act as synchronize_rcu to make sure access to | |
1242 | * old vs->vs_tpg is finished. | |
1243 | */ | |
1244 | vhost_scsi_flush(vs); | |
1245 | kfree(vs->vs_tpg); | |
1246 | vs->vs_tpg = vs_tpg; | |
1247 | ||
f2b7daf5 | 1248 | out: |
67e18cf9 | 1249 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1250 | mutex_unlock(&tcm_vhost_mutex); |
67e18cf9 | 1251 | return ret; |
057cbf49 NB |
1252 | } |
1253 | ||
683bd967 AH |
1254 | static int |
1255 | vhost_scsi_clear_endpoint(struct vhost_scsi *vs, | |
1256 | struct vhost_scsi_target *t) | |
057cbf49 NB |
1257 | { |
1258 | struct tcm_vhost_tport *tv_tport; | |
98718312 | 1259 | struct tcm_vhost_tpg *tpg; |
4f7f46d3 AH |
1260 | struct vhost_virtqueue *vq; |
1261 | bool match = false; | |
67e18cf9 AH |
1262 | int index, ret, i; |
1263 | u8 target; | |
057cbf49 | 1264 | |
f2b7daf5 | 1265 | mutex_lock(&tcm_vhost_mutex); |
057cbf49 NB |
1266 | mutex_lock(&vs->dev.mutex); |
1267 | /* Verify that ring has been setup correctly. */ | |
1268 | for (index = 0; index < vs->dev.nvqs; ++index) { | |
3ab2e420 | 1269 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
101998f6 | 1270 | ret = -EFAULT; |
038e0af4 | 1271 | goto err_dev; |
057cbf49 NB |
1272 | } |
1273 | } | |
4f7f46d3 AH |
1274 | |
1275 | if (!vs->vs_tpg) { | |
f2b7daf5 AH |
1276 | ret = 0; |
1277 | goto err_dev; | |
4f7f46d3 AH |
1278 | } |
1279 | ||
67e18cf9 AH |
1280 | for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { |
1281 | target = i; | |
98718312 AH |
1282 | tpg = vs->vs_tpg[target]; |
1283 | if (!tpg) | |
67e18cf9 AH |
1284 | continue; |
1285 | ||
98718312 AH |
1286 | mutex_lock(&tpg->tv_tpg_mutex); |
1287 | tv_tport = tpg->tport; | |
67e18cf9 AH |
1288 | if (!tv_tport) { |
1289 | ret = -ENODEV; | |
038e0af4 | 1290 | goto err_tpg; |
67e18cf9 AH |
1291 | } |
1292 | ||
1293 | if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) { | |
98718312 | 1294 | pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu" |
67e18cf9 | 1295 | " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n", |
98718312 | 1296 | tv_tport->tport_name, tpg->tport_tpgt, |
67e18cf9 AH |
1297 | t->vhost_wwpn, t->vhost_tpgt); |
1298 | ret = -EINVAL; | |
038e0af4 | 1299 | goto err_tpg; |
67e18cf9 | 1300 | } |
98718312 AH |
1301 | tpg->tv_tpg_vhost_count--; |
1302 | tpg->vhost_scsi = NULL; | |
67e18cf9 | 1303 | vs->vs_tpg[target] = NULL; |
4f7f46d3 | 1304 | match = true; |
98718312 | 1305 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 | 1306 | } |
4f7f46d3 AH |
1307 | if (match) { |
1308 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { | |
3ab2e420 | 1309 | vq = &vs->vqs[i].vq; |
4f7f46d3 AH |
1310 | /* Flushing the vhost_work acts as synchronize_rcu */ |
1311 | mutex_lock(&vq->mutex); | |
1312 | rcu_assign_pointer(vq->private_data, NULL); | |
1313 | mutex_unlock(&vq->mutex); | |
1314 | } | |
1315 | } | |
1316 | /* | |
1317 | * Act as synchronize_rcu to make sure access to | |
1318 | * old vs->vs_tpg is finished. | |
1319 | */ | |
1320 | vhost_scsi_flush(vs); | |
1321 | kfree(vs->vs_tpg); | |
1322 | vs->vs_tpg = NULL; | |
a6c9af87 | 1323 | WARN_ON(vs->vs_events_nr); |
057cbf49 | 1324 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1325 | mutex_unlock(&tcm_vhost_mutex); |
057cbf49 | 1326 | return 0; |
101998f6 | 1327 | |
038e0af4 | 1328 | err_tpg: |
98718312 | 1329 | mutex_unlock(&tpg->tv_tpg_mutex); |
038e0af4 | 1330 | err_dev: |
101998f6 | 1331 | mutex_unlock(&vs->dev.mutex); |
f2b7daf5 | 1332 | mutex_unlock(&tcm_vhost_mutex); |
101998f6 | 1333 | return ret; |
057cbf49 NB |
1334 | } |
1335 | ||
4f7f46d3 AH |
1336 | static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) |
1337 | { | |
1338 | if (features & ~VHOST_SCSI_FEATURES) | |
1339 | return -EOPNOTSUPP; | |
1340 | ||
1341 | mutex_lock(&vs->dev.mutex); | |
1342 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1343 | !vhost_log_access_ok(&vs->dev)) { | |
1344 | mutex_unlock(&vs->dev.mutex); | |
1345 | return -EFAULT; | |
1346 | } | |
1347 | vs->dev.acked_features = features; | |
1348 | smp_wmb(); | |
1349 | vhost_scsi_flush(vs); | |
1350 | mutex_unlock(&vs->dev.mutex); | |
1351 | return 0; | |
1352 | } | |
1353 | ||
057cbf49 NB |
1354 | static int vhost_scsi_open(struct inode *inode, struct file *f) |
1355 | { | |
c7289312 | 1356 | struct vhost_scsi *vs; |
3ab2e420 | 1357 | struct vhost_virtqueue **vqs; |
1b7f390e | 1358 | int r, i; |
057cbf49 | 1359 | |
c7289312 AH |
1360 | vs = kzalloc(sizeof(*vs), GFP_KERNEL); |
1361 | if (!vs) | |
057cbf49 NB |
1362 | return -ENOMEM; |
1363 | ||
3ab2e420 AH |
1364 | vqs = kmalloc(VHOST_SCSI_MAX_VQ * sizeof(*vqs), GFP_KERNEL); |
1365 | if (!vqs) { | |
c7289312 | 1366 | kfree(vs); |
3ab2e420 AH |
1367 | return -ENOMEM; |
1368 | } | |
1369 | ||
c7289312 AH |
1370 | vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work); |
1371 | vhost_work_init(&vs->vs_event_work, tcm_vhost_evt_work); | |
a6c9af87 | 1372 | |
c7289312 AH |
1373 | vs->vs_events_nr = 0; |
1374 | vs->vs_events_missed = false; | |
057cbf49 | 1375 | |
c7289312 AH |
1376 | vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq; |
1377 | vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; | |
1378 | vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick; | |
1379 | vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick; | |
3ab2e420 | 1380 | for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) { |
c7289312 AH |
1381 | vqs[i] = &vs->vqs[i].vq; |
1382 | vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick; | |
3ab2e420 | 1383 | } |
c7289312 | 1384 | r = vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ); |
f2f0173d | 1385 | |
c7289312 | 1386 | tcm_vhost_init_inflight(vs, NULL); |
f2f0173d | 1387 | |
057cbf49 | 1388 | if (r < 0) { |
3ab2e420 | 1389 | kfree(vqs); |
c7289312 | 1390 | kfree(vs); |
057cbf49 NB |
1391 | return r; |
1392 | } | |
1393 | ||
c7289312 | 1394 | f->private_data = vs; |
057cbf49 NB |
1395 | return 0; |
1396 | } | |
1397 | ||
1398 | static int vhost_scsi_release(struct inode *inode, struct file *f) | |
1399 | { | |
c7289312 | 1400 | struct vhost_scsi *vs = f->private_data; |
67e18cf9 | 1401 | struct vhost_scsi_target t; |
057cbf49 | 1402 | |
c7289312 AH |
1403 | mutex_lock(&vs->dev.mutex); |
1404 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); | |
1405 | mutex_unlock(&vs->dev.mutex); | |
1406 | vhost_scsi_clear_endpoint(vs, &t); | |
1407 | vhost_dev_stop(&vs->dev); | |
1408 | vhost_dev_cleanup(&vs->dev, false); | |
a6c9af87 | 1409 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
c7289312 AH |
1410 | vhost_scsi_flush(vs); |
1411 | kfree(vs->dev.vqs); | |
1412 | kfree(vs); | |
057cbf49 NB |
1413 | return 0; |
1414 | } | |
1415 | ||
683bd967 AH |
1416 | static long |
1417 | vhost_scsi_ioctl(struct file *f, | |
1418 | unsigned int ioctl, | |
1419 | unsigned long arg) | |
057cbf49 NB |
1420 | { |
1421 | struct vhost_scsi *vs = f->private_data; | |
1422 | struct vhost_scsi_target backend; | |
1423 | void __user *argp = (void __user *)arg; | |
1424 | u64 __user *featurep = argp; | |
11c63418 AH |
1425 | u32 __user *eventsp = argp; |
1426 | u32 events_missed; | |
057cbf49 | 1427 | u64 features; |
101998f6 | 1428 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
3ab2e420 | 1429 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
057cbf49 NB |
1430 | |
1431 | switch (ioctl) { | |
1432 | case VHOST_SCSI_SET_ENDPOINT: | |
1433 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1434 | return -EFAULT; | |
6de7145c MT |
1435 | if (backend.reserved != 0) |
1436 | return -EOPNOTSUPP; | |
057cbf49 NB |
1437 | |
1438 | return vhost_scsi_set_endpoint(vs, &backend); | |
1439 | case VHOST_SCSI_CLEAR_ENDPOINT: | |
1440 | if (copy_from_user(&backend, argp, sizeof backend)) | |
1441 | return -EFAULT; | |
6de7145c MT |
1442 | if (backend.reserved != 0) |
1443 | return -EOPNOTSUPP; | |
057cbf49 NB |
1444 | |
1445 | return vhost_scsi_clear_endpoint(vs, &backend); | |
1446 | case VHOST_SCSI_GET_ABI_VERSION: | |
101998f6 | 1447 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
057cbf49 NB |
1448 | return -EFAULT; |
1449 | return 0; | |
11c63418 AH |
1450 | case VHOST_SCSI_SET_EVENTS_MISSED: |
1451 | if (get_user(events_missed, eventsp)) | |
1452 | return -EFAULT; | |
1453 | mutex_lock(&vq->mutex); | |
1454 | vs->vs_events_missed = events_missed; | |
1455 | mutex_unlock(&vq->mutex); | |
1456 | return 0; | |
1457 | case VHOST_SCSI_GET_EVENTS_MISSED: | |
1458 | mutex_lock(&vq->mutex); | |
1459 | events_missed = vs->vs_events_missed; | |
1460 | mutex_unlock(&vq->mutex); | |
1461 | if (put_user(events_missed, eventsp)) | |
1462 | return -EFAULT; | |
1463 | return 0; | |
057cbf49 | 1464 | case VHOST_GET_FEATURES: |
5dade710 | 1465 | features = VHOST_SCSI_FEATURES; |
057cbf49 NB |
1466 | if (copy_to_user(featurep, &features, sizeof features)) |
1467 | return -EFAULT; | |
1468 | return 0; | |
1469 | case VHOST_SET_FEATURES: | |
1470 | if (copy_from_user(&features, featurep, sizeof features)) | |
1471 | return -EFAULT; | |
1472 | return vhost_scsi_set_features(vs, features); | |
1473 | default: | |
1474 | mutex_lock(&vs->dev.mutex); | |
935cdee7 MT |
1475 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
1476 | /* TODO: flush backend after dev ioctl. */ | |
1477 | if (r == -ENOIOCTLCMD) | |
1478 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); | |
057cbf49 NB |
1479 | mutex_unlock(&vs->dev.mutex); |
1480 | return r; | |
1481 | } | |
1482 | } | |
1483 | ||
101998f6 NB |
1484 | #ifdef CONFIG_COMPAT |
1485 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, | |
1486 | unsigned long arg) | |
1487 | { | |
1488 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1489 | } | |
1490 | #endif | |
1491 | ||
057cbf49 NB |
1492 | static const struct file_operations vhost_scsi_fops = { |
1493 | .owner = THIS_MODULE, | |
1494 | .release = vhost_scsi_release, | |
1495 | .unlocked_ioctl = vhost_scsi_ioctl, | |
101998f6 NB |
1496 | #ifdef CONFIG_COMPAT |
1497 | .compat_ioctl = vhost_scsi_compat_ioctl, | |
1498 | #endif | |
057cbf49 NB |
1499 | .open = vhost_scsi_open, |
1500 | .llseek = noop_llseek, | |
1501 | }; | |
1502 | ||
1503 | static struct miscdevice vhost_scsi_misc = { | |
1504 | MISC_DYNAMIC_MINOR, | |
1505 | "vhost-scsi", | |
1506 | &vhost_scsi_fops, | |
1507 | }; | |
1508 | ||
1509 | static int __init vhost_scsi_register(void) | |
1510 | { | |
1511 | return misc_register(&vhost_scsi_misc); | |
1512 | } | |
1513 | ||
1514 | static int vhost_scsi_deregister(void) | |
1515 | { | |
1516 | return misc_deregister(&vhost_scsi_misc); | |
1517 | } | |
1518 | ||
1519 | static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport) | |
1520 | { | |
1521 | switch (tport->tport_proto_id) { | |
1522 | case SCSI_PROTOCOL_SAS: | |
1523 | return "SAS"; | |
1524 | case SCSI_PROTOCOL_FCP: | |
1525 | return "FCP"; | |
1526 | case SCSI_PROTOCOL_ISCSI: | |
1527 | return "iSCSI"; | |
1528 | default: | |
1529 | break; | |
1530 | } | |
1531 | ||
1532 | return "Unknown"; | |
1533 | } | |
1534 | ||
683bd967 AH |
1535 | static void |
1536 | tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg, | |
1537 | struct se_lun *lun, bool plug) | |
a6c9af87 AH |
1538 | { |
1539 | ||
1540 | struct vhost_scsi *vs = tpg->vhost_scsi; | |
1541 | struct vhost_virtqueue *vq; | |
1542 | u32 reason; | |
1543 | ||
1544 | if (!vs) | |
1545 | return; | |
1546 | ||
1547 | mutex_lock(&vs->dev.mutex); | |
1548 | if (!vhost_has_feature(&vs->dev, VIRTIO_SCSI_F_HOTPLUG)) { | |
1549 | mutex_unlock(&vs->dev.mutex); | |
1550 | return; | |
1551 | } | |
1552 | ||
1553 | if (plug) | |
1554 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; | |
1555 | else | |
1556 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; | |
1557 | ||
3ab2e420 | 1558 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
a6c9af87 AH |
1559 | mutex_lock(&vq->mutex); |
1560 | tcm_vhost_send_evt(vs, tpg, lun, | |
1561 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); | |
1562 | mutex_unlock(&vq->mutex); | |
1563 | mutex_unlock(&vs->dev.mutex); | |
1564 | } | |
1565 | ||
1566 | static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) | |
1567 | { | |
1568 | tcm_vhost_do_plug(tpg, lun, true); | |
1569 | } | |
1570 | ||
1571 | static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun) | |
1572 | { | |
1573 | tcm_vhost_do_plug(tpg, lun, false); | |
1574 | } | |
1575 | ||
101998f6 | 1576 | static int tcm_vhost_port_link(struct se_portal_group *se_tpg, |
683bd967 | 1577 | struct se_lun *lun) |
057cbf49 | 1578 | { |
98718312 | 1579 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 NB |
1580 | struct tcm_vhost_tpg, se_tpg); |
1581 | ||
a6c9af87 AH |
1582 | mutex_lock(&tcm_vhost_mutex); |
1583 | ||
98718312 AH |
1584 | mutex_lock(&tpg->tv_tpg_mutex); |
1585 | tpg->tv_tpg_port_count++; | |
1586 | mutex_unlock(&tpg->tv_tpg_mutex); | |
057cbf49 | 1587 | |
98718312 | 1588 | tcm_vhost_hotplug(tpg, lun); |
a6c9af87 AH |
1589 | |
1590 | mutex_unlock(&tcm_vhost_mutex); | |
1591 | ||
057cbf49 NB |
1592 | return 0; |
1593 | } | |
1594 | ||
101998f6 | 1595 | static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg, |
683bd967 | 1596 | struct se_lun *lun) |
057cbf49 | 1597 | { |
98718312 | 1598 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 NB |
1599 | struct tcm_vhost_tpg, se_tpg); |
1600 | ||
a6c9af87 AH |
1601 | mutex_lock(&tcm_vhost_mutex); |
1602 | ||
98718312 AH |
1603 | mutex_lock(&tpg->tv_tpg_mutex); |
1604 | tpg->tv_tpg_port_count--; | |
1605 | mutex_unlock(&tpg->tv_tpg_mutex); | |
a6c9af87 | 1606 | |
98718312 | 1607 | tcm_vhost_hotunplug(tpg, lun); |
a6c9af87 AH |
1608 | |
1609 | mutex_unlock(&tcm_vhost_mutex); | |
057cbf49 NB |
1610 | } |
1611 | ||
683bd967 AH |
1612 | static struct se_node_acl * |
1613 | tcm_vhost_make_nodeacl(struct se_portal_group *se_tpg, | |
1614 | struct config_group *group, | |
1615 | const char *name) | |
057cbf49 NB |
1616 | { |
1617 | struct se_node_acl *se_nacl, *se_nacl_new; | |
1618 | struct tcm_vhost_nacl *nacl; | |
1619 | u64 wwpn = 0; | |
1620 | u32 nexus_depth; | |
1621 | ||
1622 | /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0) | |
1623 | return ERR_PTR(-EINVAL); */ | |
1624 | se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg); | |
1625 | if (!se_nacl_new) | |
1626 | return ERR_PTR(-ENOMEM); | |
1627 | ||
1628 | nexus_depth = 1; | |
1629 | /* | |
1630 | * se_nacl_new may be released by core_tpg_add_initiator_node_acl() | |
1631 | * when converting a NodeACL from demo mode -> explict | |
1632 | */ | |
1633 | se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new, | |
1634 | name, nexus_depth); | |
1635 | if (IS_ERR(se_nacl)) { | |
1636 | tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new); | |
1637 | return se_nacl; | |
1638 | } | |
1639 | /* | |
1640 | * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN | |
1641 | */ | |
1642 | nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl); | |
1643 | nacl->iport_wwpn = wwpn; | |
1644 | ||
1645 | return se_nacl; | |
1646 | } | |
1647 | ||
1648 | static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl) | |
1649 | { | |
1650 | struct tcm_vhost_nacl *nacl = container_of(se_acl, | |
1651 | struct tcm_vhost_nacl, se_node_acl); | |
1652 | core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1); | |
1653 | kfree(nacl); | |
1654 | } | |
1655 | ||
98718312 | 1656 | static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tpg, |
683bd967 | 1657 | const char *name) |
057cbf49 NB |
1658 | { |
1659 | struct se_portal_group *se_tpg; | |
1660 | struct tcm_vhost_nexus *tv_nexus; | |
1661 | ||
98718312 AH |
1662 | mutex_lock(&tpg->tv_tpg_mutex); |
1663 | if (tpg->tpg_nexus) { | |
1664 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1665 | pr_debug("tpg->tpg_nexus already exists\n"); | |
057cbf49 NB |
1666 | return -EEXIST; |
1667 | } | |
98718312 | 1668 | se_tpg = &tpg->se_tpg; |
057cbf49 NB |
1669 | |
1670 | tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL); | |
1671 | if (!tv_nexus) { | |
98718312 | 1672 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1673 | pr_err("Unable to allocate struct tcm_vhost_nexus\n"); |
1674 | return -ENOMEM; | |
1675 | } | |
1676 | /* | |
1677 | * Initialize the struct se_session pointer | |
1678 | */ | |
1679 | tv_nexus->tvn_se_sess = transport_init_session(); | |
1680 | if (IS_ERR(tv_nexus->tvn_se_sess)) { | |
98718312 | 1681 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1682 | kfree(tv_nexus); |
1683 | return -ENOMEM; | |
1684 | } | |
1685 | /* | |
1686 | * Since we are running in 'demo mode' this call with generate a | |
1687 | * struct se_node_acl for the tcm_vhost struct se_portal_group with | |
1688 | * the SCSI Initiator port name of the passed configfs group 'name'. | |
1689 | */ | |
1690 | tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1691 | se_tpg, (unsigned char *)name); | |
1692 | if (!tv_nexus->tvn_se_sess->se_node_acl) { | |
98718312 | 1693 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1694 | pr_debug("core_tpg_check_initiator_node_acl() failed" |
1695 | " for %s\n", name); | |
1696 | transport_free_session(tv_nexus->tvn_se_sess); | |
1697 | kfree(tv_nexus); | |
1698 | return -ENOMEM; | |
1699 | } | |
1700 | /* | |
101998f6 | 1701 | * Now register the TCM vhost virtual I_T Nexus as active with the |
057cbf49 NB |
1702 | * call to __transport_register_session() |
1703 | */ | |
1704 | __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, | |
1705 | tv_nexus->tvn_se_sess, tv_nexus); | |
98718312 | 1706 | tpg->tpg_nexus = tv_nexus; |
057cbf49 | 1707 | |
98718312 | 1708 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1709 | return 0; |
1710 | } | |
1711 | ||
101998f6 | 1712 | static int tcm_vhost_drop_nexus(struct tcm_vhost_tpg *tpg) |
057cbf49 NB |
1713 | { |
1714 | struct se_session *se_sess; | |
1715 | struct tcm_vhost_nexus *tv_nexus; | |
1716 | ||
1717 | mutex_lock(&tpg->tv_tpg_mutex); | |
1718 | tv_nexus = tpg->tpg_nexus; | |
1719 | if (!tv_nexus) { | |
1720 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1721 | return -ENODEV; | |
1722 | } | |
1723 | ||
1724 | se_sess = tv_nexus->tvn_se_sess; | |
1725 | if (!se_sess) { | |
1726 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1727 | return -ENODEV; | |
1728 | } | |
1729 | ||
101998f6 | 1730 | if (tpg->tv_tpg_port_count != 0) { |
057cbf49 | 1731 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1732 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1733 | " active TPG port count: %d\n", |
101998f6 NB |
1734 | tpg->tv_tpg_port_count); |
1735 | return -EBUSY; | |
057cbf49 NB |
1736 | } |
1737 | ||
101998f6 | 1738 | if (tpg->tv_tpg_vhost_count != 0) { |
057cbf49 | 1739 | mutex_unlock(&tpg->tv_tpg_mutex); |
101998f6 | 1740 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
057cbf49 | 1741 | " active TPG vhost count: %d\n", |
101998f6 NB |
1742 | tpg->tv_tpg_vhost_count); |
1743 | return -EBUSY; | |
057cbf49 NB |
1744 | } |
1745 | ||
101998f6 | 1746 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
057cbf49 NB |
1747 | " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport), |
1748 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
1749 | /* | |
101998f6 | 1750 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
057cbf49 NB |
1751 | */ |
1752 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
1753 | tpg->tpg_nexus = NULL; | |
1754 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1755 | ||
1756 | kfree(tv_nexus); | |
1757 | return 0; | |
1758 | } | |
1759 | ||
101998f6 | 1760 | static ssize_t tcm_vhost_tpg_show_nexus(struct se_portal_group *se_tpg, |
683bd967 | 1761 | char *page) |
057cbf49 | 1762 | { |
98718312 | 1763 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 NB |
1764 | struct tcm_vhost_tpg, se_tpg); |
1765 | struct tcm_vhost_nexus *tv_nexus; | |
1766 | ssize_t ret; | |
1767 | ||
98718312 AH |
1768 | mutex_lock(&tpg->tv_tpg_mutex); |
1769 | tv_nexus = tpg->tpg_nexus; | |
057cbf49 | 1770 | if (!tv_nexus) { |
98718312 | 1771 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1772 | return -ENODEV; |
1773 | } | |
1774 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1775 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
98718312 | 1776 | mutex_unlock(&tpg->tv_tpg_mutex); |
057cbf49 NB |
1777 | |
1778 | return ret; | |
1779 | } | |
1780 | ||
101998f6 | 1781 | static ssize_t tcm_vhost_tpg_store_nexus(struct se_portal_group *se_tpg, |
683bd967 AH |
1782 | const char *page, |
1783 | size_t count) | |
057cbf49 | 1784 | { |
98718312 | 1785 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, |
057cbf49 | 1786 | struct tcm_vhost_tpg, se_tpg); |
98718312 | 1787 | struct tcm_vhost_tport *tport_wwn = tpg->tport; |
057cbf49 NB |
1788 | unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr; |
1789 | int ret; | |
1790 | /* | |
1791 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
1792 | */ | |
1793 | if (!strncmp(page, "NULL", 4)) { | |
98718312 | 1794 | ret = tcm_vhost_drop_nexus(tpg); |
057cbf49 NB |
1795 | return (!ret) ? count : ret; |
1796 | } | |
1797 | /* | |
1798 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1799 | * the fabric protocol_id set in tcm_vhost_make_tport(), and call | |
1800 | * tcm_vhost_make_nexus(). | |
1801 | */ | |
1802 | if (strlen(page) >= TCM_VHOST_NAMELEN) { | |
1803 | pr_err("Emulated NAA Sas Address: %s, exceeds" | |
1804 | " max: %d\n", page, TCM_VHOST_NAMELEN); | |
1805 | return -EINVAL; | |
1806 | } | |
1807 | snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page); | |
1808 | ||
1809 | ptr = strstr(i_port, "naa."); | |
1810 | if (ptr) { | |
1811 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
1812 | pr_err("Passed SAS Initiator Port %s does not" | |
1813 | " match target port protoid: %s\n", i_port, | |
1814 | tcm_vhost_dump_proto_id(tport_wwn)); | |
1815 | return -EINVAL; | |
1816 | } | |
1817 | port_ptr = &i_port[0]; | |
1818 | goto check_newline; | |
1819 | } | |
1820 | ptr = strstr(i_port, "fc."); | |
1821 | if (ptr) { | |
1822 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
1823 | pr_err("Passed FCP Initiator Port %s does not" | |
1824 | " match target port protoid: %s\n", i_port, | |
1825 | tcm_vhost_dump_proto_id(tport_wwn)); | |
1826 | return -EINVAL; | |
1827 | } | |
1828 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1829 | goto check_newline; | |
1830 | } | |
1831 | ptr = strstr(i_port, "iqn."); | |
1832 | if (ptr) { | |
1833 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
1834 | pr_err("Passed iSCSI Initiator Port %s does not" | |
1835 | " match target port protoid: %s\n", i_port, | |
1836 | tcm_vhost_dump_proto_id(tport_wwn)); | |
1837 | return -EINVAL; | |
1838 | } | |
1839 | port_ptr = &i_port[0]; | |
1840 | goto check_newline; | |
1841 | } | |
1842 | pr_err("Unable to locate prefix for emulated Initiator Port:" | |
1843 | " %s\n", i_port); | |
1844 | return -EINVAL; | |
1845 | /* | |
1846 | * Clear any trailing newline for the NAA WWN | |
1847 | */ | |
1848 | check_newline: | |
1849 | if (i_port[strlen(i_port)-1] == '\n') | |
1850 | i_port[strlen(i_port)-1] = '\0'; | |
1851 | ||
98718312 | 1852 | ret = tcm_vhost_make_nexus(tpg, port_ptr); |
057cbf49 NB |
1853 | if (ret < 0) |
1854 | return ret; | |
1855 | ||
1856 | return count; | |
1857 | } | |
1858 | ||
1859 | TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR); | |
1860 | ||
1861 | static struct configfs_attribute *tcm_vhost_tpg_attrs[] = { | |
1862 | &tcm_vhost_tpg_nexus.attr, | |
1863 | NULL, | |
1864 | }; | |
1865 | ||
683bd967 AH |
1866 | static struct se_portal_group * |
1867 | tcm_vhost_make_tpg(struct se_wwn *wwn, | |
1868 | struct config_group *group, | |
1869 | const char *name) | |
057cbf49 NB |
1870 | { |
1871 | struct tcm_vhost_tport *tport = container_of(wwn, | |
1872 | struct tcm_vhost_tport, tport_wwn); | |
1873 | ||
1874 | struct tcm_vhost_tpg *tpg; | |
1875 | unsigned long tpgt; | |
1876 | int ret; | |
1877 | ||
1878 | if (strstr(name, "tpgt_") != name) | |
1879 | return ERR_PTR(-EINVAL); | |
1880 | if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX) | |
1881 | return ERR_PTR(-EINVAL); | |
1882 | ||
1883 | tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL); | |
1884 | if (!tpg) { | |
1885 | pr_err("Unable to allocate struct tcm_vhost_tpg"); | |
1886 | return ERR_PTR(-ENOMEM); | |
1887 | } | |
1888 | mutex_init(&tpg->tv_tpg_mutex); | |
1889 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
1890 | tpg->tport = tport; | |
1891 | tpg->tport_tpgt = tpgt; | |
1892 | ||
1893 | ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn, | |
1894 | &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL); | |
1895 | if (ret < 0) { | |
1896 | kfree(tpg); | |
1897 | return NULL; | |
1898 | } | |
1899 | mutex_lock(&tcm_vhost_mutex); | |
1900 | list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list); | |
1901 | mutex_unlock(&tcm_vhost_mutex); | |
1902 | ||
1903 | return &tpg->se_tpg; | |
1904 | } | |
1905 | ||
1906 | static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg) | |
1907 | { | |
1908 | struct tcm_vhost_tpg *tpg = container_of(se_tpg, | |
1909 | struct tcm_vhost_tpg, se_tpg); | |
1910 | ||
1911 | mutex_lock(&tcm_vhost_mutex); | |
1912 | list_del(&tpg->tv_tpg_list); | |
1913 | mutex_unlock(&tcm_vhost_mutex); | |
1914 | /* | |
101998f6 | 1915 | * Release the virtual I_T Nexus for this vhost TPG |
057cbf49 NB |
1916 | */ |
1917 | tcm_vhost_drop_nexus(tpg); | |
1918 | /* | |
1919 | * Deregister the se_tpg from TCM.. | |
1920 | */ | |
1921 | core_tpg_deregister(se_tpg); | |
1922 | kfree(tpg); | |
1923 | } | |
1924 | ||
683bd967 AH |
1925 | static struct se_wwn * |
1926 | tcm_vhost_make_tport(struct target_fabric_configfs *tf, | |
1927 | struct config_group *group, | |
1928 | const char *name) | |
057cbf49 NB |
1929 | { |
1930 | struct tcm_vhost_tport *tport; | |
1931 | char *ptr; | |
1932 | u64 wwpn = 0; | |
1933 | int off = 0; | |
1934 | ||
1935 | /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0) | |
1936 | return ERR_PTR(-EINVAL); */ | |
1937 | ||
1938 | tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL); | |
1939 | if (!tport) { | |
1940 | pr_err("Unable to allocate struct tcm_vhost_tport"); | |
1941 | return ERR_PTR(-ENOMEM); | |
1942 | } | |
1943 | tport->tport_wwpn = wwpn; | |
1944 | /* | |
1945 | * Determine the emulated Protocol Identifier and Target Port Name | |
1946 | * based on the incoming configfs directory name. | |
1947 | */ | |
1948 | ptr = strstr(name, "naa."); | |
1949 | if (ptr) { | |
1950 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
1951 | goto check_len; | |
1952 | } | |
1953 | ptr = strstr(name, "fc."); | |
1954 | if (ptr) { | |
1955 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
1956 | off = 3; /* Skip over "fc." */ | |
1957 | goto check_len; | |
1958 | } | |
1959 | ptr = strstr(name, "iqn."); | |
1960 | if (ptr) { | |
1961 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
1962 | goto check_len; | |
1963 | } | |
1964 | ||
1965 | pr_err("Unable to locate prefix for emulated Target Port:" | |
1966 | " %s\n", name); | |
1967 | kfree(tport); | |
1968 | return ERR_PTR(-EINVAL); | |
1969 | ||
1970 | check_len: | |
1971 | if (strlen(name) >= TCM_VHOST_NAMELEN) { | |
1972 | pr_err("Emulated %s Address: %s, exceeds" | |
1973 | " max: %d\n", name, tcm_vhost_dump_proto_id(tport), | |
1974 | TCM_VHOST_NAMELEN); | |
1975 | kfree(tport); | |
1976 | return ERR_PTR(-EINVAL); | |
1977 | } | |
1978 | snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]); | |
1979 | ||
1980 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" | |
1981 | " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name); | |
1982 | ||
1983 | return &tport->tport_wwn; | |
1984 | } | |
1985 | ||
1986 | static void tcm_vhost_drop_tport(struct se_wwn *wwn) | |
1987 | { | |
1988 | struct tcm_vhost_tport *tport = container_of(wwn, | |
1989 | struct tcm_vhost_tport, tport_wwn); | |
1990 | ||
1991 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" | |
1992 | " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), | |
1993 | tport->tport_name); | |
1994 | ||
1995 | kfree(tport); | |
1996 | } | |
1997 | ||
683bd967 AH |
1998 | static ssize_t |
1999 | tcm_vhost_wwn_show_attr_version(struct target_fabric_configfs *tf, | |
2000 | char *page) | |
057cbf49 NB |
2001 | { |
2002 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" | |
2003 | "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname, | |
2004 | utsname()->machine); | |
2005 | } | |
2006 | ||
2007 | TF_WWN_ATTR_RO(tcm_vhost, version); | |
2008 | ||
2009 | static struct configfs_attribute *tcm_vhost_wwn_attrs[] = { | |
2010 | &tcm_vhost_wwn_version.attr, | |
2011 | NULL, | |
2012 | }; | |
2013 | ||
2014 | static struct target_core_fabric_ops tcm_vhost_ops = { | |
2015 | .get_fabric_name = tcm_vhost_get_fabric_name, | |
2016 | .get_fabric_proto_ident = tcm_vhost_get_fabric_proto_ident, | |
2017 | .tpg_get_wwn = tcm_vhost_get_fabric_wwn, | |
2018 | .tpg_get_tag = tcm_vhost_get_tag, | |
2019 | .tpg_get_default_depth = tcm_vhost_get_default_depth, | |
2020 | .tpg_get_pr_transport_id = tcm_vhost_get_pr_transport_id, | |
2021 | .tpg_get_pr_transport_id_len = tcm_vhost_get_pr_transport_id_len, | |
2022 | .tpg_parse_pr_out_transport_id = tcm_vhost_parse_pr_out_transport_id, | |
2023 | .tpg_check_demo_mode = tcm_vhost_check_true, | |
2024 | .tpg_check_demo_mode_cache = tcm_vhost_check_true, | |
2025 | .tpg_check_demo_mode_write_protect = tcm_vhost_check_false, | |
2026 | .tpg_check_prod_mode_write_protect = tcm_vhost_check_false, | |
2027 | .tpg_alloc_fabric_acl = tcm_vhost_alloc_fabric_acl, | |
2028 | .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl, | |
2029 | .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index, | |
2030 | .release_cmd = tcm_vhost_release_cmd, | |
2031 | .shutdown_session = tcm_vhost_shutdown_session, | |
2032 | .close_session = tcm_vhost_close_session, | |
2033 | .sess_get_index = tcm_vhost_sess_get_index, | |
2034 | .sess_get_initiator_sid = NULL, | |
2035 | .write_pending = tcm_vhost_write_pending, | |
2036 | .write_pending_status = tcm_vhost_write_pending_status, | |
2037 | .set_default_node_attributes = tcm_vhost_set_default_node_attrs, | |
2038 | .get_task_tag = tcm_vhost_get_task_tag, | |
2039 | .get_cmd_state = tcm_vhost_get_cmd_state, | |
2040 | .queue_data_in = tcm_vhost_queue_data_in, | |
2041 | .queue_status = tcm_vhost_queue_status, | |
2042 | .queue_tm_rsp = tcm_vhost_queue_tm_rsp, | |
057cbf49 NB |
2043 | /* |
2044 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
2045 | */ | |
2046 | .fabric_make_wwn = tcm_vhost_make_tport, | |
2047 | .fabric_drop_wwn = tcm_vhost_drop_tport, | |
2048 | .fabric_make_tpg = tcm_vhost_make_tpg, | |
2049 | .fabric_drop_tpg = tcm_vhost_drop_tpg, | |
2050 | .fabric_post_link = tcm_vhost_port_link, | |
2051 | .fabric_pre_unlink = tcm_vhost_port_unlink, | |
2052 | .fabric_make_np = NULL, | |
2053 | .fabric_drop_np = NULL, | |
2054 | .fabric_make_nodeacl = tcm_vhost_make_nodeacl, | |
2055 | .fabric_drop_nodeacl = tcm_vhost_drop_nodeacl, | |
2056 | }; | |
2057 | ||
2058 | static int tcm_vhost_register_configfs(void) | |
2059 | { | |
2060 | struct target_fabric_configfs *fabric; | |
2061 | int ret; | |
2062 | ||
2063 | pr_debug("TCM_VHOST fabric module %s on %s/%s" | |
2064 | " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname, | |
2065 | utsname()->machine); | |
2066 | /* | |
2067 | * Register the top level struct config_item_type with TCM core | |
2068 | */ | |
2069 | fabric = target_fabric_configfs_init(THIS_MODULE, "vhost"); | |
2070 | if (IS_ERR(fabric)) { | |
2071 | pr_err("target_fabric_configfs_init() failed\n"); | |
2072 | return PTR_ERR(fabric); | |
2073 | } | |
2074 | /* | |
2075 | * Setup fabric->tf_ops from our local tcm_vhost_ops | |
2076 | */ | |
2077 | fabric->tf_ops = tcm_vhost_ops; | |
2078 | /* | |
2079 | * Setup default attribute lists for various fabric->tf_cit_tmpl | |
2080 | */ | |
2081 | TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs; | |
2082 | TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs; | |
2083 | TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL; | |
2084 | TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL; | |
2085 | TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL; | |
2086 | TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL; | |
2087 | TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL; | |
2088 | TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL; | |
2089 | TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL; | |
2090 | /* | |
2091 | * Register the fabric for use within TCM | |
2092 | */ | |
2093 | ret = target_fabric_configfs_register(fabric); | |
2094 | if (ret < 0) { | |
2095 | pr_err("target_fabric_configfs_register() failed" | |
2096 | " for TCM_VHOST\n"); | |
2097 | return ret; | |
2098 | } | |
2099 | /* | |
2100 | * Setup our local pointer to *fabric | |
2101 | */ | |
2102 | tcm_vhost_fabric_configfs = fabric; | |
2103 | pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n"); | |
2104 | return 0; | |
2105 | }; | |
2106 | ||
2107 | static void tcm_vhost_deregister_configfs(void) | |
2108 | { | |
2109 | if (!tcm_vhost_fabric_configfs) | |
2110 | return; | |
2111 | ||
2112 | target_fabric_configfs_deregister(tcm_vhost_fabric_configfs); | |
2113 | tcm_vhost_fabric_configfs = NULL; | |
2114 | pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n"); | |
2115 | }; | |
2116 | ||
2117 | static int __init tcm_vhost_init(void) | |
2118 | { | |
2119 | int ret = -ENOMEM; | |
101998f6 NB |
2120 | /* |
2121 | * Use our own dedicated workqueue for submitting I/O into | |
2122 | * target core to avoid contention within system_wq. | |
2123 | */ | |
057cbf49 NB |
2124 | tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0); |
2125 | if (!tcm_vhost_workqueue) | |
2126 | goto out; | |
2127 | ||
2128 | ret = vhost_scsi_register(); | |
2129 | if (ret < 0) | |
2130 | goto out_destroy_workqueue; | |
2131 | ||
2132 | ret = tcm_vhost_register_configfs(); | |
2133 | if (ret < 0) | |
2134 | goto out_vhost_scsi_deregister; | |
2135 | ||
2136 | return 0; | |
2137 | ||
2138 | out_vhost_scsi_deregister: | |
2139 | vhost_scsi_deregister(); | |
2140 | out_destroy_workqueue: | |
2141 | destroy_workqueue(tcm_vhost_workqueue); | |
2142 | out: | |
2143 | return ret; | |
2144 | }; | |
2145 | ||
2146 | static void tcm_vhost_exit(void) | |
2147 | { | |
2148 | tcm_vhost_deregister_configfs(); | |
2149 | vhost_scsi_deregister(); | |
2150 | destroy_workqueue(tcm_vhost_workqueue); | |
2151 | }; | |
2152 | ||
181c04a3 MT |
2153 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
2154 | MODULE_ALIAS("tcm_vhost"); | |
057cbf49 NB |
2155 | MODULE_LICENSE("GPL"); |
2156 | module_init(tcm_vhost_init); | |
2157 | module_exit(tcm_vhost_exit); |