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3699d92a KP |
1 | /* |
2 | * Copyright (c) 2010 Cisco Systems, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | /* XXX TBD some includes may be extraneous */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/moduleparam.h> | |
3699d92a KP |
22 | #include <linux/utsname.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/kthread.h> | |
26 | #include <linux/types.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/configfs.h> | |
29 | #include <linux/ctype.h> | |
30 | #include <linux/hash.h> | |
31 | #include <linux/rcupdate.h> | |
32 | #include <linux/rculist.h> | |
33 | #include <linux/kref.h> | |
34 | #include <asm/unaligned.h> | |
35 | #include <scsi/scsi.h> | |
36 | #include <scsi/scsi_host.h> | |
37 | #include <scsi/scsi_device.h> | |
38 | #include <scsi/scsi_cmnd.h> | |
39 | #include <scsi/libfc.h> | |
40 | ||
41 | #include <target/target_core_base.h> | |
c4795fb2 | 42 | #include <target/target_core_fabric.h> |
3699d92a | 43 | #include <target/target_core_configfs.h> |
3699d92a KP |
44 | #include <target/configfs_macros.h> |
45 | ||
3699d92a KP |
46 | #include "tcm_fc.h" |
47 | ||
48 | static void ft_sess_delete_all(struct ft_tport *); | |
49 | ||
50 | /* | |
51 | * Lookup or allocate target local port. | |
52 | * Caller holds ft_lport_lock. | |
53 | */ | |
54 | static struct ft_tport *ft_tport_create(struct fc_lport *lport) | |
55 | { | |
56 | struct ft_tpg *tpg; | |
57 | struct ft_tport *tport; | |
58 | int i; | |
59 | ||
863555be MR |
60 | tport = rcu_dereference_protected(lport->prov[FC_TYPE_FCP], |
61 | lockdep_is_held(&ft_lport_lock)); | |
3699d92a KP |
62 | if (tport && tport->tpg) |
63 | return tport; | |
64 | ||
65 | tpg = ft_lport_find_tpg(lport); | |
66 | if (!tpg) | |
67 | return NULL; | |
68 | ||
69 | if (tport) { | |
70 | tport->tpg = tpg; | |
71 | return tport; | |
72 | } | |
73 | ||
74 | tport = kzalloc(sizeof(*tport), GFP_KERNEL); | |
75 | if (!tport) | |
76 | return NULL; | |
77 | ||
78 | tport->lport = lport; | |
79 | tport->tpg = tpg; | |
80 | tpg->tport = tport; | |
81 | for (i = 0; i < FT_SESS_HASH_SIZE; i++) | |
82 | INIT_HLIST_HEAD(&tport->hash[i]); | |
83 | ||
84 | rcu_assign_pointer(lport->prov[FC_TYPE_FCP], tport); | |
85 | return tport; | |
86 | } | |
87 | ||
3699d92a KP |
88 | /* |
89 | * Delete a target local port. | |
90 | * Caller holds ft_lport_lock. | |
91 | */ | |
92 | static void ft_tport_delete(struct ft_tport *tport) | |
93 | { | |
94 | struct fc_lport *lport; | |
95 | struct ft_tpg *tpg; | |
96 | ||
97 | ft_sess_delete_all(tport); | |
98 | lport = tport->lport; | |
99 | BUG_ON(tport != lport->prov[FC_TYPE_FCP]); | |
100 | rcu_assign_pointer(lport->prov[FC_TYPE_FCP], NULL); | |
101 | ||
102 | tpg = tport->tpg; | |
103 | if (tpg) { | |
104 | tpg->tport = NULL; | |
105 | tport->tpg = NULL; | |
106 | } | |
a6c76da8 | 107 | kfree_rcu(tport, rcu); |
3699d92a KP |
108 | } |
109 | ||
110 | /* | |
111 | * Add local port. | |
112 | * Called thru fc_lport_iterate(). | |
113 | */ | |
114 | void ft_lport_add(struct fc_lport *lport, void *arg) | |
115 | { | |
116 | mutex_lock(&ft_lport_lock); | |
117 | ft_tport_create(lport); | |
118 | mutex_unlock(&ft_lport_lock); | |
119 | } | |
120 | ||
121 | /* | |
122 | * Delete local port. | |
123 | * Called thru fc_lport_iterate(). | |
124 | */ | |
125 | void ft_lport_del(struct fc_lport *lport, void *arg) | |
126 | { | |
127 | struct ft_tport *tport; | |
128 | ||
129 | mutex_lock(&ft_lport_lock); | |
130 | tport = lport->prov[FC_TYPE_FCP]; | |
131 | if (tport) | |
132 | ft_tport_delete(tport); | |
133 | mutex_unlock(&ft_lport_lock); | |
134 | } | |
135 | ||
136 | /* | |
137 | * Notification of local port change from libfc. | |
138 | * Create or delete local port and associated tport. | |
139 | */ | |
140 | int ft_lport_notify(struct notifier_block *nb, unsigned long event, void *arg) | |
141 | { | |
142 | struct fc_lport *lport = arg; | |
143 | ||
144 | switch (event) { | |
145 | case FC_LPORT_EV_ADD: | |
146 | ft_lport_add(lport, NULL); | |
147 | break; | |
148 | case FC_LPORT_EV_DEL: | |
149 | ft_lport_del(lport, NULL); | |
150 | break; | |
151 | } | |
152 | return NOTIFY_DONE; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Hash function for FC_IDs. | |
157 | */ | |
158 | static u32 ft_sess_hash(u32 port_id) | |
159 | { | |
160 | return hash_32(port_id, FT_SESS_HASH_BITS); | |
161 | } | |
162 | ||
163 | /* | |
164 | * Find session in local port. | |
165 | * Sessions and hash lists are RCU-protected. | |
166 | * A reference is taken which must be eventually freed. | |
167 | */ | |
168 | static struct ft_sess *ft_sess_get(struct fc_lport *lport, u32 port_id) | |
169 | { | |
170 | struct ft_tport *tport; | |
171 | struct hlist_head *head; | |
3699d92a KP |
172 | struct ft_sess *sess; |
173 | ||
174 | rcu_read_lock(); | |
175 | tport = rcu_dereference(lport->prov[FC_TYPE_FCP]); | |
176 | if (!tport) | |
177 | goto out; | |
178 | ||
179 | head = &tport->hash[ft_sess_hash(port_id)]; | |
b67bfe0d | 180 | hlist_for_each_entry_rcu(sess, head, hash) { |
3699d92a KP |
181 | if (sess->port_id == port_id) { |
182 | kref_get(&sess->kref); | |
183 | rcu_read_unlock(); | |
6708bb27 | 184 | pr_debug("port_id %x found %p\n", port_id, sess); |
3699d92a KP |
185 | return sess; |
186 | } | |
187 | } | |
188 | out: | |
189 | rcu_read_unlock(); | |
6708bb27 | 190 | pr_debug("port_id %x not found\n", port_id); |
3699d92a KP |
191 | return NULL; |
192 | } | |
193 | ||
194 | /* | |
195 | * Allocate session and enter it in the hash for the local port. | |
196 | * Caller holds ft_lport_lock. | |
197 | */ | |
198 | static struct ft_sess *ft_sess_create(struct ft_tport *tport, u32 port_id, | |
199 | struct ft_node_acl *acl) | |
200 | { | |
201 | struct ft_sess *sess; | |
202 | struct hlist_head *head; | |
3699d92a KP |
203 | |
204 | head = &tport->hash[ft_sess_hash(port_id)]; | |
b67bfe0d | 205 | hlist_for_each_entry_rcu(sess, head, hash) |
3699d92a KP |
206 | if (sess->port_id == port_id) |
207 | return sess; | |
208 | ||
209 | sess = kzalloc(sizeof(*sess), GFP_KERNEL); | |
210 | if (!sess) | |
211 | return NULL; | |
212 | ||
213 | sess->se_sess = transport_init_session(); | |
552523dc | 214 | if (IS_ERR(sess->se_sess)) { |
3699d92a KP |
215 | kfree(sess); |
216 | return NULL; | |
217 | } | |
218 | sess->se_sess->se_node_acl = &acl->se_node_acl; | |
219 | sess->tport = tport; | |
220 | sess->port_id = port_id; | |
221 | kref_init(&sess->kref); /* ref for table entry */ | |
222 | hlist_add_head_rcu(&sess->hash, head); | |
223 | tport->sess_count++; | |
224 | ||
6708bb27 | 225 | pr_debug("port_id %x sess %p\n", port_id, sess); |
3699d92a KP |
226 | |
227 | transport_register_session(&tport->tpg->se_tpg, &acl->se_node_acl, | |
228 | sess->se_sess, sess); | |
229 | return sess; | |
230 | } | |
231 | ||
232 | /* | |
233 | * Unhash the session. | |
234 | * Caller holds ft_lport_lock. | |
235 | */ | |
236 | static void ft_sess_unhash(struct ft_sess *sess) | |
237 | { | |
238 | struct ft_tport *tport = sess->tport; | |
239 | ||
240 | hlist_del_rcu(&sess->hash); | |
241 | BUG_ON(!tport->sess_count); | |
242 | tport->sess_count--; | |
243 | sess->port_id = -1; | |
244 | sess->params = 0; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Delete session from hash. | |
249 | * Caller holds ft_lport_lock. | |
250 | */ | |
251 | static struct ft_sess *ft_sess_delete(struct ft_tport *tport, u32 port_id) | |
252 | { | |
253 | struct hlist_head *head; | |
3699d92a KP |
254 | struct ft_sess *sess; |
255 | ||
256 | head = &tport->hash[ft_sess_hash(port_id)]; | |
b67bfe0d | 257 | hlist_for_each_entry_rcu(sess, head, hash) { |
3699d92a KP |
258 | if (sess->port_id == port_id) { |
259 | ft_sess_unhash(sess); | |
260 | return sess; | |
261 | } | |
262 | } | |
263 | return NULL; | |
264 | } | |
265 | ||
266 | /* | |
267 | * Delete all sessions from tport. | |
268 | * Caller holds ft_lport_lock. | |
269 | */ | |
270 | static void ft_sess_delete_all(struct ft_tport *tport) | |
271 | { | |
272 | struct hlist_head *head; | |
3699d92a KP |
273 | struct ft_sess *sess; |
274 | ||
275 | for (head = tport->hash; | |
276 | head < &tport->hash[FT_SESS_HASH_SIZE]; head++) { | |
b67bfe0d | 277 | hlist_for_each_entry_rcu(sess, head, hash) { |
3699d92a KP |
278 | ft_sess_unhash(sess); |
279 | transport_deregister_session_configfs(sess->se_sess); | |
280 | ft_sess_put(sess); /* release from table */ | |
281 | } | |
282 | } | |
283 | } | |
284 | ||
285 | /* | |
286 | * TCM ops for sessions. | |
287 | */ | |
288 | ||
289 | /* | |
290 | * Determine whether session is allowed to be shutdown in the current context. | |
291 | * Returns non-zero if the session should be shutdown. | |
292 | */ | |
293 | int ft_sess_shutdown(struct se_session *se_sess) | |
294 | { | |
295 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
296 | ||
6708bb27 | 297 | pr_debug("port_id %x\n", sess->port_id); |
3699d92a KP |
298 | return 1; |
299 | } | |
300 | ||
301 | /* | |
302 | * Remove session and send PRLO. | |
303 | * This is called when the ACL is being deleted or queue depth is changing. | |
304 | */ | |
305 | void ft_sess_close(struct se_session *se_sess) | |
306 | { | |
307 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
3699d92a KP |
308 | u32 port_id; |
309 | ||
310 | mutex_lock(&ft_lport_lock); | |
3699d92a KP |
311 | port_id = sess->port_id; |
312 | if (port_id == -1) { | |
7c7cf3b9 | 313 | mutex_unlock(&ft_lport_lock); |
3699d92a KP |
314 | return; |
315 | } | |
6708bb27 | 316 | pr_debug("port_id %x\n", port_id); |
3699d92a KP |
317 | ft_sess_unhash(sess); |
318 | mutex_unlock(&ft_lport_lock); | |
319 | transport_deregister_session_configfs(se_sess); | |
320 | ft_sess_put(sess); | |
321 | /* XXX Send LOGO or PRLO */ | |
322 | synchronize_rcu(); /* let transport deregister happen */ | |
323 | } | |
324 | ||
3699d92a KP |
325 | u32 ft_sess_get_index(struct se_session *se_sess) |
326 | { | |
327 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
328 | ||
329 | return sess->port_id; /* XXX TBD probably not what is needed */ | |
330 | } | |
331 | ||
332 | u32 ft_sess_get_port_name(struct se_session *se_sess, | |
333 | unsigned char *buf, u32 len) | |
334 | { | |
335 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
336 | ||
337 | return ft_format_wwn(buf, len, sess->port_name); | |
338 | } | |
339 | ||
3699d92a KP |
340 | /* |
341 | * libfc ops involving sessions. | |
342 | */ | |
343 | ||
344 | static int ft_prli_locked(struct fc_rport_priv *rdata, u32 spp_len, | |
345 | const struct fc_els_spp *rspp, struct fc_els_spp *spp) | |
346 | { | |
347 | struct ft_tport *tport; | |
348 | struct ft_sess *sess; | |
349 | struct ft_node_acl *acl; | |
350 | u32 fcp_parm; | |
351 | ||
352 | tport = ft_tport_create(rdata->local_port); | |
353 | if (!tport) | |
edec8dfe | 354 | goto not_target; /* not a target for this local port */ |
3699d92a KP |
355 | |
356 | acl = ft_acl_get(tport->tpg, rdata); | |
357 | if (!acl) | |
edec8dfe | 358 | goto not_target; /* no target for this remote */ |
3699d92a KP |
359 | |
360 | if (!rspp) | |
361 | goto fill; | |
362 | ||
363 | if (rspp->spp_flags & (FC_SPP_OPA_VAL | FC_SPP_RPA_VAL)) | |
364 | return FC_SPP_RESP_NO_PA; | |
365 | ||
366 | /* | |
367 | * If both target and initiator bits are off, the SPP is invalid. | |
368 | */ | |
369 | fcp_parm = ntohl(rspp->spp_params); | |
370 | if (!(fcp_parm & (FCP_SPPF_INIT_FCN | FCP_SPPF_TARG_FCN))) | |
371 | return FC_SPP_RESP_INVL; | |
372 | ||
373 | /* | |
374 | * Create session (image pair) only if requested by | |
375 | * EST_IMG_PAIR flag and if the requestor is an initiator. | |
376 | */ | |
377 | if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR) { | |
378 | spp->spp_flags |= FC_SPP_EST_IMG_PAIR; | |
379 | if (!(fcp_parm & FCP_SPPF_INIT_FCN)) | |
380 | return FC_SPP_RESP_CONF; | |
381 | sess = ft_sess_create(tport, rdata->ids.port_id, acl); | |
382 | if (!sess) | |
383 | return FC_SPP_RESP_RES; | |
384 | if (!sess->params) | |
385 | rdata->prli_count++; | |
386 | sess->params = fcp_parm; | |
387 | sess->port_name = rdata->ids.port_name; | |
388 | sess->max_frame = rdata->maxframe_size; | |
389 | ||
390 | /* XXX TBD - clearing actions. unit attn, see 4.10 */ | |
391 | } | |
392 | ||
393 | /* | |
394 | * OR in our service parameters with other provider (initiator), if any. | |
3699d92a KP |
395 | */ |
396 | fill: | |
397 | fcp_parm = ntohl(spp->spp_params); | |
f2eeba21 | 398 | fcp_parm &= ~FCP_SPPF_RETRY; |
3699d92a KP |
399 | spp->spp_params = htonl(fcp_parm | FCP_SPPF_TARG_FCN); |
400 | return FC_SPP_RESP_ACK; | |
edec8dfe MR |
401 | |
402 | not_target: | |
403 | fcp_parm = ntohl(spp->spp_params); | |
404 | fcp_parm &= ~FCP_SPPF_TARG_FCN; | |
405 | spp->spp_params = htonl(fcp_parm); | |
406 | return 0; | |
3699d92a KP |
407 | } |
408 | ||
409 | /** | |
410 | * tcm_fcp_prli() - Handle incoming or outgoing PRLI for the FCP target | |
411 | * @rdata: remote port private | |
412 | * @spp_len: service parameter page length | |
413 | * @rspp: received service parameter page (NULL for outgoing PRLI) | |
414 | * @spp: response service parameter page | |
415 | * | |
416 | * Returns spp response code. | |
417 | */ | |
418 | static int ft_prli(struct fc_rport_priv *rdata, u32 spp_len, | |
419 | const struct fc_els_spp *rspp, struct fc_els_spp *spp) | |
420 | { | |
421 | int ret; | |
422 | ||
423 | mutex_lock(&ft_lport_lock); | |
424 | ret = ft_prli_locked(rdata, spp_len, rspp, spp); | |
425 | mutex_unlock(&ft_lport_lock); | |
6708bb27 | 426 | pr_debug("port_id %x flags %x ret %x\n", |
3699d92a KP |
427 | rdata->ids.port_id, rspp ? rspp->spp_flags : 0, ret); |
428 | return ret; | |
429 | } | |
430 | ||
3699d92a KP |
431 | static void ft_sess_free(struct kref *kref) |
432 | { | |
433 | struct ft_sess *sess = container_of(kref, struct ft_sess, kref); | |
434 | ||
9f4ad44b | 435 | transport_deregister_session(sess->se_sess); |
a6ad57ef | 436 | kfree_rcu(sess, rcu); |
3699d92a KP |
437 | } |
438 | ||
439 | void ft_sess_put(struct ft_sess *sess) | |
440 | { | |
441 | int sess_held = atomic_read(&sess->kref.refcount); | |
442 | ||
443 | BUG_ON(!sess_held); | |
444 | kref_put(&sess->kref, ft_sess_free); | |
445 | } | |
446 | ||
447 | static void ft_prlo(struct fc_rport_priv *rdata) | |
448 | { | |
449 | struct ft_sess *sess; | |
450 | struct ft_tport *tport; | |
451 | ||
452 | mutex_lock(&ft_lport_lock); | |
08a16208 DE |
453 | tport = rcu_dereference_protected(rdata->local_port->prov[FC_TYPE_FCP], |
454 | lockdep_is_held(&ft_lport_lock)); | |
455 | ||
3699d92a KP |
456 | if (!tport) { |
457 | mutex_unlock(&ft_lport_lock); | |
458 | return; | |
459 | } | |
460 | sess = ft_sess_delete(tport, rdata->ids.port_id); | |
461 | if (!sess) { | |
462 | mutex_unlock(&ft_lport_lock); | |
463 | return; | |
464 | } | |
465 | mutex_unlock(&ft_lport_lock); | |
466 | transport_deregister_session_configfs(sess->se_sess); | |
467 | ft_sess_put(sess); /* release from table */ | |
468 | rdata->prli_count--; | |
469 | /* XXX TBD - clearing actions. unit attn, see 4.10 */ | |
470 | } | |
471 | ||
472 | /* | |
473 | * Handle incoming FCP request. | |
474 | * Caller has verified that the frame is type FCP. | |
475 | */ | |
476 | static void ft_recv(struct fc_lport *lport, struct fc_frame *fp) | |
477 | { | |
478 | struct ft_sess *sess; | |
479 | u32 sid = fc_frame_sid(fp); | |
480 | ||
6708bb27 | 481 | pr_debug("sid %x\n", sid); |
3699d92a KP |
482 | |
483 | sess = ft_sess_get(lport, sid); | |
484 | if (!sess) { | |
6708bb27 | 485 | pr_debug("sid %x sess lookup failed\n", sid); |
3699d92a KP |
486 | /* TBD XXX - if FCP_CMND, send PRLO */ |
487 | fc_frame_free(fp); | |
488 | return; | |
489 | } | |
490 | ft_recv_req(sess, fp); /* must do ft_sess_put() */ | |
491 | } | |
492 | ||
493 | /* | |
494 | * Provider ops for libfc. | |
495 | */ | |
496 | struct fc4_prov ft_prov = { | |
497 | .prli = ft_prli, | |
498 | .prlo = ft_prlo, | |
499 | .recv = ft_recv, | |
500 | .module = THIS_MODULE, | |
501 | }; |