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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 <generated/utsrelease.h> |
23 | #include <linux/utsname.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/kthread.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/configfs.h> | |
30 | #include <linux/ctype.h> | |
31 | #include <linux/hash.h> | |
32 | #include <linux/rcupdate.h> | |
33 | #include <linux/rculist.h> | |
34 | #include <linux/kref.h> | |
35 | #include <asm/unaligned.h> | |
36 | #include <scsi/scsi.h> | |
37 | #include <scsi/scsi_host.h> | |
38 | #include <scsi/scsi_device.h> | |
39 | #include <scsi/scsi_cmnd.h> | |
40 | #include <scsi/libfc.h> | |
41 | ||
42 | #include <target/target_core_base.h> | |
c4795fb2 | 43 | #include <target/target_core_fabric.h> |
3699d92a | 44 | #include <target/target_core_configfs.h> |
3699d92a KP |
45 | #include <target/configfs_macros.h> |
46 | ||
3699d92a KP |
47 | #include "tcm_fc.h" |
48 | ||
49 | static void ft_sess_delete_all(struct ft_tport *); | |
50 | ||
51 | /* | |
52 | * Lookup or allocate target local port. | |
53 | * Caller holds ft_lport_lock. | |
54 | */ | |
55 | static struct ft_tport *ft_tport_create(struct fc_lport *lport) | |
56 | { | |
57 | struct ft_tpg *tpg; | |
58 | struct ft_tport *tport; | |
59 | int i; | |
60 | ||
61 | tport = rcu_dereference(lport->prov[FC_TYPE_FCP]); | |
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 | ||
88 | /* | |
89 | * Free tport via RCU. | |
90 | */ | |
91 | static void ft_tport_rcu_free(struct rcu_head *rcu) | |
92 | { | |
93 | struct ft_tport *tport = container_of(rcu, struct ft_tport, rcu); | |
94 | ||
95 | kfree(tport); | |
96 | } | |
97 | ||
98 | /* | |
99 | * Delete a target local port. | |
100 | * Caller holds ft_lport_lock. | |
101 | */ | |
102 | static void ft_tport_delete(struct ft_tport *tport) | |
103 | { | |
104 | struct fc_lport *lport; | |
105 | struct ft_tpg *tpg; | |
106 | ||
107 | ft_sess_delete_all(tport); | |
108 | lport = tport->lport; | |
109 | BUG_ON(tport != lport->prov[FC_TYPE_FCP]); | |
110 | rcu_assign_pointer(lport->prov[FC_TYPE_FCP], NULL); | |
111 | ||
112 | tpg = tport->tpg; | |
113 | if (tpg) { | |
114 | tpg->tport = NULL; | |
115 | tport->tpg = NULL; | |
116 | } | |
117 | call_rcu(&tport->rcu, ft_tport_rcu_free); | |
118 | } | |
119 | ||
120 | /* | |
121 | * Add local port. | |
122 | * Called thru fc_lport_iterate(). | |
123 | */ | |
124 | void ft_lport_add(struct fc_lport *lport, void *arg) | |
125 | { | |
126 | mutex_lock(&ft_lport_lock); | |
127 | ft_tport_create(lport); | |
128 | mutex_unlock(&ft_lport_lock); | |
129 | } | |
130 | ||
131 | /* | |
132 | * Delete local port. | |
133 | * Called thru fc_lport_iterate(). | |
134 | */ | |
135 | void ft_lport_del(struct fc_lport *lport, void *arg) | |
136 | { | |
137 | struct ft_tport *tport; | |
138 | ||
139 | mutex_lock(&ft_lport_lock); | |
140 | tport = lport->prov[FC_TYPE_FCP]; | |
141 | if (tport) | |
142 | ft_tport_delete(tport); | |
143 | mutex_unlock(&ft_lport_lock); | |
144 | } | |
145 | ||
146 | /* | |
147 | * Notification of local port change from libfc. | |
148 | * Create or delete local port and associated tport. | |
149 | */ | |
150 | int ft_lport_notify(struct notifier_block *nb, unsigned long event, void *arg) | |
151 | { | |
152 | struct fc_lport *lport = arg; | |
153 | ||
154 | switch (event) { | |
155 | case FC_LPORT_EV_ADD: | |
156 | ft_lport_add(lport, NULL); | |
157 | break; | |
158 | case FC_LPORT_EV_DEL: | |
159 | ft_lport_del(lport, NULL); | |
160 | break; | |
161 | } | |
162 | return NOTIFY_DONE; | |
163 | } | |
164 | ||
165 | /* | |
166 | * Hash function for FC_IDs. | |
167 | */ | |
168 | static u32 ft_sess_hash(u32 port_id) | |
169 | { | |
170 | return hash_32(port_id, FT_SESS_HASH_BITS); | |
171 | } | |
172 | ||
173 | /* | |
174 | * Find session in local port. | |
175 | * Sessions and hash lists are RCU-protected. | |
176 | * A reference is taken which must be eventually freed. | |
177 | */ | |
178 | static struct ft_sess *ft_sess_get(struct fc_lport *lport, u32 port_id) | |
179 | { | |
180 | struct ft_tport *tport; | |
181 | struct hlist_head *head; | |
182 | struct hlist_node *pos; | |
183 | struct ft_sess *sess; | |
184 | ||
185 | rcu_read_lock(); | |
186 | tport = rcu_dereference(lport->prov[FC_TYPE_FCP]); | |
187 | if (!tport) | |
188 | goto out; | |
189 | ||
190 | head = &tport->hash[ft_sess_hash(port_id)]; | |
191 | hlist_for_each_entry_rcu(sess, pos, head, hash) { | |
192 | if (sess->port_id == port_id) { | |
193 | kref_get(&sess->kref); | |
194 | rcu_read_unlock(); | |
6708bb27 | 195 | pr_debug("port_id %x found %p\n", port_id, sess); |
3699d92a KP |
196 | return sess; |
197 | } | |
198 | } | |
199 | out: | |
200 | rcu_read_unlock(); | |
6708bb27 | 201 | pr_debug("port_id %x not found\n", port_id); |
3699d92a KP |
202 | return NULL; |
203 | } | |
204 | ||
205 | /* | |
206 | * Allocate session and enter it in the hash for the local port. | |
207 | * Caller holds ft_lport_lock. | |
208 | */ | |
209 | static struct ft_sess *ft_sess_create(struct ft_tport *tport, u32 port_id, | |
210 | struct ft_node_acl *acl) | |
211 | { | |
212 | struct ft_sess *sess; | |
213 | struct hlist_head *head; | |
214 | struct hlist_node *pos; | |
215 | ||
216 | head = &tport->hash[ft_sess_hash(port_id)]; | |
217 | hlist_for_each_entry_rcu(sess, pos, head, hash) | |
218 | if (sess->port_id == port_id) | |
219 | return sess; | |
220 | ||
221 | sess = kzalloc(sizeof(*sess), GFP_KERNEL); | |
222 | if (!sess) | |
223 | return NULL; | |
224 | ||
225 | sess->se_sess = transport_init_session(); | |
552523dc | 226 | if (IS_ERR(sess->se_sess)) { |
3699d92a KP |
227 | kfree(sess); |
228 | return NULL; | |
229 | } | |
230 | sess->se_sess->se_node_acl = &acl->se_node_acl; | |
231 | sess->tport = tport; | |
232 | sess->port_id = port_id; | |
233 | kref_init(&sess->kref); /* ref for table entry */ | |
234 | hlist_add_head_rcu(&sess->hash, head); | |
235 | tport->sess_count++; | |
236 | ||
6708bb27 | 237 | pr_debug("port_id %x sess %p\n", port_id, sess); |
3699d92a KP |
238 | |
239 | transport_register_session(&tport->tpg->se_tpg, &acl->se_node_acl, | |
240 | sess->se_sess, sess); | |
241 | return sess; | |
242 | } | |
243 | ||
244 | /* | |
245 | * Unhash the session. | |
246 | * Caller holds ft_lport_lock. | |
247 | */ | |
248 | static void ft_sess_unhash(struct ft_sess *sess) | |
249 | { | |
250 | struct ft_tport *tport = sess->tport; | |
251 | ||
252 | hlist_del_rcu(&sess->hash); | |
253 | BUG_ON(!tport->sess_count); | |
254 | tport->sess_count--; | |
255 | sess->port_id = -1; | |
256 | sess->params = 0; | |
257 | } | |
258 | ||
259 | /* | |
260 | * Delete session from hash. | |
261 | * Caller holds ft_lport_lock. | |
262 | */ | |
263 | static struct ft_sess *ft_sess_delete(struct ft_tport *tport, u32 port_id) | |
264 | { | |
265 | struct hlist_head *head; | |
266 | struct hlist_node *pos; | |
267 | struct ft_sess *sess; | |
268 | ||
269 | head = &tport->hash[ft_sess_hash(port_id)]; | |
270 | hlist_for_each_entry_rcu(sess, pos, head, hash) { | |
271 | if (sess->port_id == port_id) { | |
272 | ft_sess_unhash(sess); | |
273 | return sess; | |
274 | } | |
275 | } | |
276 | return NULL; | |
277 | } | |
278 | ||
279 | /* | |
280 | * Delete all sessions from tport. | |
281 | * Caller holds ft_lport_lock. | |
282 | */ | |
283 | static void ft_sess_delete_all(struct ft_tport *tport) | |
284 | { | |
285 | struct hlist_head *head; | |
286 | struct hlist_node *pos; | |
287 | struct ft_sess *sess; | |
288 | ||
289 | for (head = tport->hash; | |
290 | head < &tport->hash[FT_SESS_HASH_SIZE]; head++) { | |
291 | hlist_for_each_entry_rcu(sess, pos, head, hash) { | |
292 | ft_sess_unhash(sess); | |
293 | transport_deregister_session_configfs(sess->se_sess); | |
294 | ft_sess_put(sess); /* release from table */ | |
295 | } | |
296 | } | |
297 | } | |
298 | ||
299 | /* | |
300 | * TCM ops for sessions. | |
301 | */ | |
302 | ||
303 | /* | |
304 | * Determine whether session is allowed to be shutdown in the current context. | |
305 | * Returns non-zero if the session should be shutdown. | |
306 | */ | |
307 | int ft_sess_shutdown(struct se_session *se_sess) | |
308 | { | |
309 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
310 | ||
6708bb27 | 311 | pr_debug("port_id %x\n", sess->port_id); |
3699d92a KP |
312 | return 1; |
313 | } | |
314 | ||
315 | /* | |
316 | * Remove session and send PRLO. | |
317 | * This is called when the ACL is being deleted or queue depth is changing. | |
318 | */ | |
319 | void ft_sess_close(struct se_session *se_sess) | |
320 | { | |
321 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
322 | struct fc_lport *lport; | |
323 | u32 port_id; | |
324 | ||
325 | mutex_lock(&ft_lport_lock); | |
326 | lport = sess->tport->lport; | |
327 | port_id = sess->port_id; | |
328 | if (port_id == -1) { | |
7c7cf3b9 | 329 | mutex_unlock(&ft_lport_lock); |
3699d92a KP |
330 | return; |
331 | } | |
6708bb27 | 332 | pr_debug("port_id %x\n", port_id); |
3699d92a KP |
333 | ft_sess_unhash(sess); |
334 | mutex_unlock(&ft_lport_lock); | |
335 | transport_deregister_session_configfs(se_sess); | |
336 | ft_sess_put(sess); | |
337 | /* XXX Send LOGO or PRLO */ | |
338 | synchronize_rcu(); /* let transport deregister happen */ | |
339 | } | |
340 | ||
341 | void ft_sess_stop(struct se_session *se_sess, int sess_sleep, int conn_sleep) | |
342 | { | |
343 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
344 | ||
6708bb27 | 345 | pr_debug("port_id %x\n", sess->port_id); |
3699d92a KP |
346 | } |
347 | ||
348 | int ft_sess_logged_in(struct se_session *se_sess) | |
349 | { | |
350 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
351 | ||
352 | return sess->port_id != -1; | |
353 | } | |
354 | ||
355 | u32 ft_sess_get_index(struct se_session *se_sess) | |
356 | { | |
357 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
358 | ||
359 | return sess->port_id; /* XXX TBD probably not what is needed */ | |
360 | } | |
361 | ||
362 | u32 ft_sess_get_port_name(struct se_session *se_sess, | |
363 | unsigned char *buf, u32 len) | |
364 | { | |
365 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
366 | ||
367 | return ft_format_wwn(buf, len, sess->port_name); | |
368 | } | |
369 | ||
370 | void ft_sess_set_erl0(struct se_session *se_sess) | |
371 | { | |
372 | /* XXX TBD called when out of memory */ | |
373 | } | |
374 | ||
375 | /* | |
376 | * libfc ops involving sessions. | |
377 | */ | |
378 | ||
379 | static int ft_prli_locked(struct fc_rport_priv *rdata, u32 spp_len, | |
380 | const struct fc_els_spp *rspp, struct fc_els_spp *spp) | |
381 | { | |
382 | struct ft_tport *tport; | |
383 | struct ft_sess *sess; | |
384 | struct ft_node_acl *acl; | |
385 | u32 fcp_parm; | |
386 | ||
387 | tport = ft_tport_create(rdata->local_port); | |
388 | if (!tport) | |
389 | return 0; /* not a target for this local port */ | |
390 | ||
391 | acl = ft_acl_get(tport->tpg, rdata); | |
392 | if (!acl) | |
393 | return 0; | |
394 | ||
395 | if (!rspp) | |
396 | goto fill; | |
397 | ||
398 | if (rspp->spp_flags & (FC_SPP_OPA_VAL | FC_SPP_RPA_VAL)) | |
399 | return FC_SPP_RESP_NO_PA; | |
400 | ||
401 | /* | |
402 | * If both target and initiator bits are off, the SPP is invalid. | |
403 | */ | |
404 | fcp_parm = ntohl(rspp->spp_params); | |
405 | if (!(fcp_parm & (FCP_SPPF_INIT_FCN | FCP_SPPF_TARG_FCN))) | |
406 | return FC_SPP_RESP_INVL; | |
407 | ||
408 | /* | |
409 | * Create session (image pair) only if requested by | |
410 | * EST_IMG_PAIR flag and if the requestor is an initiator. | |
411 | */ | |
412 | if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR) { | |
413 | spp->spp_flags |= FC_SPP_EST_IMG_PAIR; | |
414 | if (!(fcp_parm & FCP_SPPF_INIT_FCN)) | |
415 | return FC_SPP_RESP_CONF; | |
416 | sess = ft_sess_create(tport, rdata->ids.port_id, acl); | |
417 | if (!sess) | |
418 | return FC_SPP_RESP_RES; | |
419 | if (!sess->params) | |
420 | rdata->prli_count++; | |
421 | sess->params = fcp_parm; | |
422 | sess->port_name = rdata->ids.port_name; | |
423 | sess->max_frame = rdata->maxframe_size; | |
424 | ||
425 | /* XXX TBD - clearing actions. unit attn, see 4.10 */ | |
426 | } | |
427 | ||
428 | /* | |
429 | * OR in our service parameters with other provider (initiator), if any. | |
430 | * TBD XXX - indicate RETRY capability? | |
431 | */ | |
432 | fill: | |
433 | fcp_parm = ntohl(spp->spp_params); | |
434 | spp->spp_params = htonl(fcp_parm | FCP_SPPF_TARG_FCN); | |
435 | return FC_SPP_RESP_ACK; | |
436 | } | |
437 | ||
438 | /** | |
439 | * tcm_fcp_prli() - Handle incoming or outgoing PRLI for the FCP target | |
440 | * @rdata: remote port private | |
441 | * @spp_len: service parameter page length | |
442 | * @rspp: received service parameter page (NULL for outgoing PRLI) | |
443 | * @spp: response service parameter page | |
444 | * | |
445 | * Returns spp response code. | |
446 | */ | |
447 | static int ft_prli(struct fc_rport_priv *rdata, u32 spp_len, | |
448 | const struct fc_els_spp *rspp, struct fc_els_spp *spp) | |
449 | { | |
450 | int ret; | |
451 | ||
452 | mutex_lock(&ft_lport_lock); | |
453 | ret = ft_prli_locked(rdata, spp_len, rspp, spp); | |
454 | mutex_unlock(&ft_lport_lock); | |
6708bb27 | 455 | pr_debug("port_id %x flags %x ret %x\n", |
3699d92a KP |
456 | rdata->ids.port_id, rspp ? rspp->spp_flags : 0, ret); |
457 | return ret; | |
458 | } | |
459 | ||
460 | static void ft_sess_rcu_free(struct rcu_head *rcu) | |
461 | { | |
462 | struct ft_sess *sess = container_of(rcu, struct ft_sess, rcu); | |
463 | ||
464 | transport_deregister_session(sess->se_sess); | |
465 | kfree(sess); | |
466 | } | |
467 | ||
468 | static void ft_sess_free(struct kref *kref) | |
469 | { | |
470 | struct ft_sess *sess = container_of(kref, struct ft_sess, kref); | |
471 | ||
472 | call_rcu(&sess->rcu, ft_sess_rcu_free); | |
473 | } | |
474 | ||
475 | void ft_sess_put(struct ft_sess *sess) | |
476 | { | |
477 | int sess_held = atomic_read(&sess->kref.refcount); | |
478 | ||
479 | BUG_ON(!sess_held); | |
480 | kref_put(&sess->kref, ft_sess_free); | |
481 | } | |
482 | ||
483 | static void ft_prlo(struct fc_rport_priv *rdata) | |
484 | { | |
485 | struct ft_sess *sess; | |
486 | struct ft_tport *tport; | |
487 | ||
488 | mutex_lock(&ft_lport_lock); | |
489 | tport = rcu_dereference(rdata->local_port->prov[FC_TYPE_FCP]); | |
490 | if (!tport) { | |
491 | mutex_unlock(&ft_lport_lock); | |
492 | return; | |
493 | } | |
494 | sess = ft_sess_delete(tport, rdata->ids.port_id); | |
495 | if (!sess) { | |
496 | mutex_unlock(&ft_lport_lock); | |
497 | return; | |
498 | } | |
499 | mutex_unlock(&ft_lport_lock); | |
500 | transport_deregister_session_configfs(sess->se_sess); | |
501 | ft_sess_put(sess); /* release from table */ | |
502 | rdata->prli_count--; | |
503 | /* XXX TBD - clearing actions. unit attn, see 4.10 */ | |
504 | } | |
505 | ||
506 | /* | |
507 | * Handle incoming FCP request. | |
508 | * Caller has verified that the frame is type FCP. | |
509 | */ | |
510 | static void ft_recv(struct fc_lport *lport, struct fc_frame *fp) | |
511 | { | |
512 | struct ft_sess *sess; | |
513 | u32 sid = fc_frame_sid(fp); | |
514 | ||
6708bb27 | 515 | pr_debug("sid %x\n", sid); |
3699d92a KP |
516 | |
517 | sess = ft_sess_get(lport, sid); | |
518 | if (!sess) { | |
6708bb27 | 519 | pr_debug("sid %x sess lookup failed\n", sid); |
3699d92a KP |
520 | /* TBD XXX - if FCP_CMND, send PRLO */ |
521 | fc_frame_free(fp); | |
522 | return; | |
523 | } | |
524 | ft_recv_req(sess, fp); /* must do ft_sess_put() */ | |
525 | } | |
526 | ||
527 | /* | |
528 | * Provider ops for libfc. | |
529 | */ | |
530 | struct fc4_prov ft_prov = { | |
531 | .prli = ft_prli, | |
532 | .prlo = ft_prlo, | |
533 | .recv = ft_recv, | |
534 | .module = THIS_MODULE, | |
535 | }; |