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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 | ||
863555be MR |
61 | tport = rcu_dereference_protected(lport->prov[FC_TYPE_FCP], |
62 | lockdep_is_held(&ft_lport_lock)); | |
3699d92a KP |
63 | if (tport && tport->tpg) |
64 | return tport; | |
65 | ||
66 | tpg = ft_lport_find_tpg(lport); | |
67 | if (!tpg) | |
68 | return NULL; | |
69 | ||
70 | if (tport) { | |
71 | tport->tpg = tpg; | |
72 | return tport; | |
73 | } | |
74 | ||
75 | tport = kzalloc(sizeof(*tport), GFP_KERNEL); | |
76 | if (!tport) | |
77 | return NULL; | |
78 | ||
79 | tport->lport = lport; | |
80 | tport->tpg = tpg; | |
81 | tpg->tport = tport; | |
82 | for (i = 0; i < FT_SESS_HASH_SIZE; i++) | |
83 | INIT_HLIST_HEAD(&tport->hash[i]); | |
84 | ||
85 | rcu_assign_pointer(lport->prov[FC_TYPE_FCP], tport); | |
86 | return tport; | |
87 | } | |
88 | ||
3699d92a KP |
89 | /* |
90 | * Delete a target local port. | |
91 | * Caller holds ft_lport_lock. | |
92 | */ | |
93 | static void ft_tport_delete(struct ft_tport *tport) | |
94 | { | |
95 | struct fc_lport *lport; | |
96 | struct ft_tpg *tpg; | |
97 | ||
98 | ft_sess_delete_all(tport); | |
99 | lport = tport->lport; | |
100 | BUG_ON(tport != lport->prov[FC_TYPE_FCP]); | |
101 | rcu_assign_pointer(lport->prov[FC_TYPE_FCP], NULL); | |
102 | ||
103 | tpg = tport->tpg; | |
104 | if (tpg) { | |
105 | tpg->tport = NULL; | |
106 | tport->tpg = NULL; | |
107 | } | |
a6c76da8 | 108 | kfree_rcu(tport, rcu); |
3699d92a KP |
109 | } |
110 | ||
111 | /* | |
112 | * Add local port. | |
113 | * Called thru fc_lport_iterate(). | |
114 | */ | |
115 | void ft_lport_add(struct fc_lport *lport, void *arg) | |
116 | { | |
117 | mutex_lock(&ft_lport_lock); | |
118 | ft_tport_create(lport); | |
119 | mutex_unlock(&ft_lport_lock); | |
120 | } | |
121 | ||
122 | /* | |
123 | * Delete local port. | |
124 | * Called thru fc_lport_iterate(). | |
125 | */ | |
126 | void ft_lport_del(struct fc_lport *lport, void *arg) | |
127 | { | |
128 | struct ft_tport *tport; | |
129 | ||
130 | mutex_lock(&ft_lport_lock); | |
131 | tport = lport->prov[FC_TYPE_FCP]; | |
132 | if (tport) | |
133 | ft_tport_delete(tport); | |
134 | mutex_unlock(&ft_lport_lock); | |
135 | } | |
136 | ||
137 | /* | |
138 | * Notification of local port change from libfc. | |
139 | * Create or delete local port and associated tport. | |
140 | */ | |
141 | int ft_lport_notify(struct notifier_block *nb, unsigned long event, void *arg) | |
142 | { | |
143 | struct fc_lport *lport = arg; | |
144 | ||
145 | switch (event) { | |
146 | case FC_LPORT_EV_ADD: | |
147 | ft_lport_add(lport, NULL); | |
148 | break; | |
149 | case FC_LPORT_EV_DEL: | |
150 | ft_lport_del(lport, NULL); | |
151 | break; | |
152 | } | |
153 | return NOTIFY_DONE; | |
154 | } | |
155 | ||
156 | /* | |
157 | * Hash function for FC_IDs. | |
158 | */ | |
159 | static u32 ft_sess_hash(u32 port_id) | |
160 | { | |
161 | return hash_32(port_id, FT_SESS_HASH_BITS); | |
162 | } | |
163 | ||
164 | /* | |
165 | * Find session in local port. | |
166 | * Sessions and hash lists are RCU-protected. | |
167 | * A reference is taken which must be eventually freed. | |
168 | */ | |
169 | static struct ft_sess *ft_sess_get(struct fc_lport *lport, u32 port_id) | |
170 | { | |
171 | struct ft_tport *tport; | |
172 | struct hlist_head *head; | |
173 | struct hlist_node *pos; | |
174 | struct ft_sess *sess; | |
175 | ||
176 | rcu_read_lock(); | |
177 | tport = rcu_dereference(lport->prov[FC_TYPE_FCP]); | |
178 | if (!tport) | |
179 | goto out; | |
180 | ||
181 | head = &tport->hash[ft_sess_hash(port_id)]; | |
182 | hlist_for_each_entry_rcu(sess, pos, head, hash) { | |
183 | if (sess->port_id == port_id) { | |
184 | kref_get(&sess->kref); | |
185 | rcu_read_unlock(); | |
6708bb27 | 186 | pr_debug("port_id %x found %p\n", port_id, sess); |
3699d92a KP |
187 | return sess; |
188 | } | |
189 | } | |
190 | out: | |
191 | rcu_read_unlock(); | |
6708bb27 | 192 | pr_debug("port_id %x not found\n", port_id); |
3699d92a KP |
193 | return NULL; |
194 | } | |
195 | ||
196 | /* | |
197 | * Allocate session and enter it in the hash for the local port. | |
198 | * Caller holds ft_lport_lock. | |
199 | */ | |
200 | static struct ft_sess *ft_sess_create(struct ft_tport *tport, u32 port_id, | |
201 | struct ft_node_acl *acl) | |
202 | { | |
203 | struct ft_sess *sess; | |
204 | struct hlist_head *head; | |
205 | struct hlist_node *pos; | |
206 | ||
207 | head = &tport->hash[ft_sess_hash(port_id)]; | |
208 | hlist_for_each_entry_rcu(sess, pos, head, hash) | |
209 | if (sess->port_id == port_id) | |
210 | return sess; | |
211 | ||
212 | sess = kzalloc(sizeof(*sess), GFP_KERNEL); | |
213 | if (!sess) | |
214 | return NULL; | |
215 | ||
216 | sess->se_sess = transport_init_session(); | |
552523dc | 217 | if (IS_ERR(sess->se_sess)) { |
3699d92a KP |
218 | kfree(sess); |
219 | return NULL; | |
220 | } | |
221 | sess->se_sess->se_node_acl = &acl->se_node_acl; | |
222 | sess->tport = tport; | |
223 | sess->port_id = port_id; | |
224 | kref_init(&sess->kref); /* ref for table entry */ | |
225 | hlist_add_head_rcu(&sess->hash, head); | |
226 | tport->sess_count++; | |
227 | ||
6708bb27 | 228 | pr_debug("port_id %x sess %p\n", port_id, sess); |
3699d92a KP |
229 | |
230 | transport_register_session(&tport->tpg->se_tpg, &acl->se_node_acl, | |
231 | sess->se_sess, sess); | |
232 | return sess; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Unhash the session. | |
237 | * Caller holds ft_lport_lock. | |
238 | */ | |
239 | static void ft_sess_unhash(struct ft_sess *sess) | |
240 | { | |
241 | struct ft_tport *tport = sess->tport; | |
242 | ||
243 | hlist_del_rcu(&sess->hash); | |
244 | BUG_ON(!tport->sess_count); | |
245 | tport->sess_count--; | |
246 | sess->port_id = -1; | |
247 | sess->params = 0; | |
248 | } | |
249 | ||
250 | /* | |
251 | * Delete session from hash. | |
252 | * Caller holds ft_lport_lock. | |
253 | */ | |
254 | static struct ft_sess *ft_sess_delete(struct ft_tport *tport, u32 port_id) | |
255 | { | |
256 | struct hlist_head *head; | |
257 | struct hlist_node *pos; | |
258 | struct ft_sess *sess; | |
259 | ||
260 | head = &tport->hash[ft_sess_hash(port_id)]; | |
261 | hlist_for_each_entry_rcu(sess, pos, head, hash) { | |
262 | if (sess->port_id == port_id) { | |
263 | ft_sess_unhash(sess); | |
264 | return sess; | |
265 | } | |
266 | } | |
267 | return NULL; | |
268 | } | |
269 | ||
270 | /* | |
271 | * Delete all sessions from tport. | |
272 | * Caller holds ft_lport_lock. | |
273 | */ | |
274 | static void ft_sess_delete_all(struct ft_tport *tport) | |
275 | { | |
276 | struct hlist_head *head; | |
277 | struct hlist_node *pos; | |
278 | struct ft_sess *sess; | |
279 | ||
280 | for (head = tport->hash; | |
281 | head < &tport->hash[FT_SESS_HASH_SIZE]; head++) { | |
282 | hlist_for_each_entry_rcu(sess, pos, head, hash) { | |
283 | ft_sess_unhash(sess); | |
284 | transport_deregister_session_configfs(sess->se_sess); | |
285 | ft_sess_put(sess); /* release from table */ | |
286 | } | |
287 | } | |
288 | } | |
289 | ||
290 | /* | |
291 | * TCM ops for sessions. | |
292 | */ | |
293 | ||
294 | /* | |
295 | * Determine whether session is allowed to be shutdown in the current context. | |
296 | * Returns non-zero if the session should be shutdown. | |
297 | */ | |
298 | int ft_sess_shutdown(struct se_session *se_sess) | |
299 | { | |
300 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
301 | ||
6708bb27 | 302 | pr_debug("port_id %x\n", sess->port_id); |
3699d92a KP |
303 | return 1; |
304 | } | |
305 | ||
306 | /* | |
307 | * Remove session and send PRLO. | |
308 | * This is called when the ACL is being deleted or queue depth is changing. | |
309 | */ | |
310 | void ft_sess_close(struct se_session *se_sess) | |
311 | { | |
312 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
3699d92a KP |
313 | u32 port_id; |
314 | ||
315 | mutex_lock(&ft_lport_lock); | |
3699d92a KP |
316 | port_id = sess->port_id; |
317 | if (port_id == -1) { | |
7c7cf3b9 | 318 | mutex_unlock(&ft_lport_lock); |
3699d92a KP |
319 | return; |
320 | } | |
6708bb27 | 321 | pr_debug("port_id %x\n", port_id); |
3699d92a KP |
322 | ft_sess_unhash(sess); |
323 | mutex_unlock(&ft_lport_lock); | |
324 | transport_deregister_session_configfs(se_sess); | |
325 | ft_sess_put(sess); | |
326 | /* XXX Send LOGO or PRLO */ | |
327 | synchronize_rcu(); /* let transport deregister happen */ | |
328 | } | |
329 | ||
3699d92a KP |
330 | u32 ft_sess_get_index(struct se_session *se_sess) |
331 | { | |
332 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
333 | ||
334 | return sess->port_id; /* XXX TBD probably not what is needed */ | |
335 | } | |
336 | ||
337 | u32 ft_sess_get_port_name(struct se_session *se_sess, | |
338 | unsigned char *buf, u32 len) | |
339 | { | |
340 | struct ft_sess *sess = se_sess->fabric_sess_ptr; | |
341 | ||
342 | return ft_format_wwn(buf, len, sess->port_name); | |
343 | } | |
344 | ||
3699d92a KP |
345 | /* |
346 | * libfc ops involving sessions. | |
347 | */ | |
348 | ||
349 | static int ft_prli_locked(struct fc_rport_priv *rdata, u32 spp_len, | |
350 | const struct fc_els_spp *rspp, struct fc_els_spp *spp) | |
351 | { | |
352 | struct ft_tport *tport; | |
353 | struct ft_sess *sess; | |
354 | struct ft_node_acl *acl; | |
355 | u32 fcp_parm; | |
356 | ||
357 | tport = ft_tport_create(rdata->local_port); | |
358 | if (!tport) | |
359 | return 0; /* not a target for this local port */ | |
360 | ||
361 | acl = ft_acl_get(tport->tpg, rdata); | |
362 | if (!acl) | |
363 | return 0; | |
364 | ||
365 | if (!rspp) | |
366 | goto fill; | |
367 | ||
368 | if (rspp->spp_flags & (FC_SPP_OPA_VAL | FC_SPP_RPA_VAL)) | |
369 | return FC_SPP_RESP_NO_PA; | |
370 | ||
371 | /* | |
372 | * If both target and initiator bits are off, the SPP is invalid. | |
373 | */ | |
374 | fcp_parm = ntohl(rspp->spp_params); | |
375 | if (!(fcp_parm & (FCP_SPPF_INIT_FCN | FCP_SPPF_TARG_FCN))) | |
376 | return FC_SPP_RESP_INVL; | |
377 | ||
378 | /* | |
379 | * Create session (image pair) only if requested by | |
380 | * EST_IMG_PAIR flag and if the requestor is an initiator. | |
381 | */ | |
382 | if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR) { | |
383 | spp->spp_flags |= FC_SPP_EST_IMG_PAIR; | |
384 | if (!(fcp_parm & FCP_SPPF_INIT_FCN)) | |
385 | return FC_SPP_RESP_CONF; | |
386 | sess = ft_sess_create(tport, rdata->ids.port_id, acl); | |
387 | if (!sess) | |
388 | return FC_SPP_RESP_RES; | |
389 | if (!sess->params) | |
390 | rdata->prli_count++; | |
391 | sess->params = fcp_parm; | |
392 | sess->port_name = rdata->ids.port_name; | |
393 | sess->max_frame = rdata->maxframe_size; | |
394 | ||
395 | /* XXX TBD - clearing actions. unit attn, see 4.10 */ | |
396 | } | |
397 | ||
398 | /* | |
399 | * OR in our service parameters with other provider (initiator), if any. | |
400 | * TBD XXX - indicate RETRY capability? | |
401 | */ | |
402 | fill: | |
403 | fcp_parm = ntohl(spp->spp_params); | |
404 | spp->spp_params = htonl(fcp_parm | FCP_SPPF_TARG_FCN); | |
405 | return FC_SPP_RESP_ACK; | |
406 | } | |
407 | ||
408 | /** | |
409 | * tcm_fcp_prli() - Handle incoming or outgoing PRLI for the FCP target | |
410 | * @rdata: remote port private | |
411 | * @spp_len: service parameter page length | |
412 | * @rspp: received service parameter page (NULL for outgoing PRLI) | |
413 | * @spp: response service parameter page | |
414 | * | |
415 | * Returns spp response code. | |
416 | */ | |
417 | static int ft_prli(struct fc_rport_priv *rdata, u32 spp_len, | |
418 | const struct fc_els_spp *rspp, struct fc_els_spp *spp) | |
419 | { | |
420 | int ret; | |
421 | ||
422 | mutex_lock(&ft_lport_lock); | |
423 | ret = ft_prli_locked(rdata, spp_len, rspp, spp); | |
424 | mutex_unlock(&ft_lport_lock); | |
6708bb27 | 425 | pr_debug("port_id %x flags %x ret %x\n", |
3699d92a KP |
426 | rdata->ids.port_id, rspp ? rspp->spp_flags : 0, ret); |
427 | return ret; | |
428 | } | |
429 | ||
430 | static void ft_sess_rcu_free(struct rcu_head *rcu) | |
431 | { | |
432 | struct ft_sess *sess = container_of(rcu, struct ft_sess, rcu); | |
433 | ||
434 | transport_deregister_session(sess->se_sess); | |
435 | kfree(sess); | |
436 | } | |
437 | ||
438 | static void ft_sess_free(struct kref *kref) | |
439 | { | |
440 | struct ft_sess *sess = container_of(kref, struct ft_sess, kref); | |
441 | ||
442 | call_rcu(&sess->rcu, ft_sess_rcu_free); | |
443 | } | |
444 | ||
445 | void ft_sess_put(struct ft_sess *sess) | |
446 | { | |
447 | int sess_held = atomic_read(&sess->kref.refcount); | |
448 | ||
449 | BUG_ON(!sess_held); | |
450 | kref_put(&sess->kref, ft_sess_free); | |
451 | } | |
452 | ||
453 | static void ft_prlo(struct fc_rport_priv *rdata) | |
454 | { | |
455 | struct ft_sess *sess; | |
456 | struct ft_tport *tport; | |
457 | ||
458 | mutex_lock(&ft_lport_lock); | |
459 | tport = rcu_dereference(rdata->local_port->prov[FC_TYPE_FCP]); | |
460 | if (!tport) { | |
461 | mutex_unlock(&ft_lport_lock); | |
462 | return; | |
463 | } | |
464 | sess = ft_sess_delete(tport, rdata->ids.port_id); | |
465 | if (!sess) { | |
466 | mutex_unlock(&ft_lport_lock); | |
467 | return; | |
468 | } | |
469 | mutex_unlock(&ft_lport_lock); | |
470 | transport_deregister_session_configfs(sess->se_sess); | |
471 | ft_sess_put(sess); /* release from table */ | |
472 | rdata->prli_count--; | |
473 | /* XXX TBD - clearing actions. unit attn, see 4.10 */ | |
474 | } | |
475 | ||
476 | /* | |
477 | * Handle incoming FCP request. | |
478 | * Caller has verified that the frame is type FCP. | |
479 | */ | |
480 | static void ft_recv(struct fc_lport *lport, struct fc_frame *fp) | |
481 | { | |
482 | struct ft_sess *sess; | |
483 | u32 sid = fc_frame_sid(fp); | |
484 | ||
6708bb27 | 485 | pr_debug("sid %x\n", sid); |
3699d92a KP |
486 | |
487 | sess = ft_sess_get(lport, sid); | |
488 | if (!sess) { | |
6708bb27 | 489 | pr_debug("sid %x sess lookup failed\n", sid); |
3699d92a KP |
490 | /* TBD XXX - if FCP_CMND, send PRLO */ |
491 | fc_frame_free(fp); | |
492 | return; | |
493 | } | |
494 | ft_recv_req(sess, fp); /* must do ft_sess_put() */ | |
495 | } | |
496 | ||
497 | /* | |
498 | * Provider ops for libfc. | |
499 | */ | |
500 | struct fc4_prov ft_prov = { | |
501 | .prli = ft_prli, | |
502 | .prlo = ft_prlo, | |
503 | .recv = ft_recv, | |
504 | .module = THIS_MODULE, | |
505 | }; |