1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20#include <linux/module.h>
21#include <linux/moduleparam.h>
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>
42#include <target/target_core_fabric.h>
43#include <target/target_core_configfs.h>
44#include <target/configfs_macros.h>
45
46#include "tcm_fc.h"
47
48static void ft_sess_delete_all(struct ft_tport *);
49
50
51
52
53
54static struct ft_tport *ft_tport_get(struct fc_lport *lport)
55{
56 struct ft_tpg *tpg;
57 struct ft_tport *tport;
58 int i;
59
60 tport = rcu_dereference_protected(lport->prov[FC_TYPE_FCP],
61 lockdep_is_held(&ft_lport_lock));
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 tpg->tport = tport;
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
89
90
91
92
93static 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_INIT_POINTER(lport->prov[FC_TYPE_FCP], NULL);
102
103 tpg = tport->tpg;
104 if (tpg) {
105 tpg->tport = NULL;
106 tport->tpg = NULL;
107 }
108 kfree_rcu(tport, rcu);
109}
110
111
112
113
114
115void ft_lport_add(struct fc_lport *lport, void *arg)
116{
117 mutex_lock(&ft_lport_lock);
118 ft_tport_get(lport);
119 mutex_unlock(&ft_lport_lock);
120}
121
122
123
124
125
126void 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
139
140
141int 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
158
159static u32 ft_sess_hash(u32 port_id)
160{
161 return hash_32(port_id, FT_SESS_HASH_BITS);
162}
163
164
165
166
167
168
169static 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 ft_sess *sess;
174
175 rcu_read_lock();
176 tport = rcu_dereference(lport->prov[FC_TYPE_FCP]);
177 if (!tport)
178 goto out;
179
180 head = &tport->hash[ft_sess_hash(port_id)];
181 hlist_for_each_entry_rcu(sess, head, hash) {
182 if (sess->port_id == port_id) {
183 kref_get(&sess->kref);
184 rcu_read_unlock();
185 pr_debug("port_id %x found %p\n", port_id, sess);
186 return sess;
187 }
188 }
189out:
190 rcu_read_unlock();
191 pr_debug("port_id %x not found\n", port_id);
192 return NULL;
193}
194
195
196
197
198
199static struct ft_sess *ft_sess_create(struct ft_tport *tport, u32 port_id,
200 struct ft_node_acl *acl)
201{
202 struct ft_sess *sess;
203 struct hlist_head *head;
204
205 head = &tport->hash[ft_sess_hash(port_id)];
206 hlist_for_each_entry_rcu(sess, head, hash)
207 if (sess->port_id == port_id)
208 return sess;
209
210 sess = kzalloc(sizeof(*sess), GFP_KERNEL);
211 if (!sess)
212 return NULL;
213
214 sess->se_sess = transport_init_session_tags(TCM_FC_DEFAULT_TAGS,
215 sizeof(struct ft_cmd),
216 TARGET_PROT_NORMAL);
217 if (IS_ERR(sess->se_sess)) {
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);
225 hlist_add_head_rcu(&sess->hash, head);
226 tport->sess_count++;
227
228 pr_debug("port_id %x sess %p\n", port_id, sess);
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
237
238
239static 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
252
253
254static struct ft_sess *ft_sess_delete(struct ft_tport *tport, u32 port_id)
255{
256 struct hlist_head *head;
257 struct ft_sess *sess;
258
259 head = &tport->hash[ft_sess_hash(port_id)];
260 hlist_for_each_entry_rcu(sess, head, hash) {
261 if (sess->port_id == port_id) {
262 ft_sess_unhash(sess);
263 return sess;
264 }
265 }
266 return NULL;
267}
268
269
270
271
272
273static void ft_sess_delete_all(struct ft_tport *tport)
274{
275 struct hlist_head *head;
276 struct ft_sess *sess;
277
278 for (head = tport->hash;
279 head < &tport->hash[FT_SESS_HASH_SIZE]; head++) {
280 hlist_for_each_entry_rcu(sess, head, hash) {
281 ft_sess_unhash(sess);
282 transport_deregister_session_configfs(sess->se_sess);
283 ft_sess_put(sess);
284 }
285 }
286}
287
288
289
290
291
292
293
294
295
296int ft_sess_shutdown(struct se_session *se_sess)
297{
298 struct ft_sess *sess = se_sess->fabric_sess_ptr;
299
300 pr_debug("port_id %x\n", sess->port_id);
301 return 1;
302}
303
304
305
306
307
308void ft_sess_close(struct se_session *se_sess)
309{
310 struct ft_sess *sess = se_sess->fabric_sess_ptr;
311 u32 port_id;
312
313 mutex_lock(&ft_lport_lock);
314 port_id = sess->port_id;
315 if (port_id == -1) {
316 mutex_unlock(&ft_lport_lock);
317 return;
318 }
319 pr_debug("port_id %x\n", port_id);
320 ft_sess_unhash(sess);
321 mutex_unlock(&ft_lport_lock);
322 transport_deregister_session_configfs(se_sess);
323 ft_sess_put(sess);
324
325 synchronize_rcu();
326}
327
328u32 ft_sess_get_index(struct se_session *se_sess)
329{
330 struct ft_sess *sess = se_sess->fabric_sess_ptr;
331
332 return sess->port_id;
333}
334
335u32 ft_sess_get_port_name(struct se_session *se_sess,
336 unsigned char *buf, u32 len)
337{
338 struct ft_sess *sess = se_sess->fabric_sess_ptr;
339
340 return ft_format_wwn(buf, len, sess->port_name);
341}
342
343
344
345
346
347static int ft_prli_locked(struct fc_rport_priv *rdata, u32 spp_len,
348 const struct fc_els_spp *rspp, struct fc_els_spp *spp)
349{
350 struct ft_tport *tport;
351 struct ft_sess *sess;
352 struct ft_node_acl *acl;
353 u32 fcp_parm;
354
355 tport = ft_tport_get(rdata->local_port);
356 if (!tport)
357 goto not_target;
358
359 acl = ft_acl_get(tport->tpg, rdata);
360 if (!acl)
361 goto not_target;
362
363 if (!rspp)
364 goto fill;
365
366 if (rspp->spp_flags & (FC_SPP_OPA_VAL | FC_SPP_RPA_VAL))
367 return FC_SPP_RESP_NO_PA;
368
369
370
371
372 fcp_parm = ntohl(rspp->spp_params);
373 if (!(fcp_parm & (FCP_SPPF_INIT_FCN | FCP_SPPF_TARG_FCN)))
374 return FC_SPP_RESP_INVL;
375
376
377
378
379
380 if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR) {
381 spp->spp_flags |= FC_SPP_EST_IMG_PAIR;
382 if (!(fcp_parm & FCP_SPPF_INIT_FCN))
383 return FC_SPP_RESP_CONF;
384 sess = ft_sess_create(tport, rdata->ids.port_id, acl);
385 if (!sess)
386 return FC_SPP_RESP_RES;
387 if (!sess->params)
388 rdata->prli_count++;
389 sess->params = fcp_parm;
390 sess->port_name = rdata->ids.port_name;
391 sess->max_frame = rdata->maxframe_size;
392
393
394 }
395
396
397
398
399fill:
400 fcp_parm = ntohl(spp->spp_params);
401 fcp_parm &= ~FCP_SPPF_RETRY;
402 spp->spp_params = htonl(fcp_parm | FCP_SPPF_TARG_FCN);
403 return FC_SPP_RESP_ACK;
404
405not_target:
406 fcp_parm = ntohl(spp->spp_params);
407 fcp_parm &= ~FCP_SPPF_TARG_FCN;
408 spp->spp_params = htonl(fcp_parm);
409 return 0;
410}
411
412
413
414
415
416
417
418
419
420
421static int ft_prli(struct fc_rport_priv *rdata, u32 spp_len,
422 const struct fc_els_spp *rspp, struct fc_els_spp *spp)
423{
424 int ret;
425
426 mutex_lock(&ft_lport_lock);
427 ret = ft_prli_locked(rdata, spp_len, rspp, spp);
428 mutex_unlock(&ft_lport_lock);
429 pr_debug("port_id %x flags %x ret %x\n",
430 rdata->ids.port_id, rspp ? rspp->spp_flags : 0, ret);
431 return ret;
432}
433
434static void ft_sess_free(struct kref *kref)
435{
436 struct ft_sess *sess = container_of(kref, struct ft_sess, kref);
437
438 transport_deregister_session(sess->se_sess);
439 kfree_rcu(sess, rcu);
440}
441
442void ft_sess_put(struct ft_sess *sess)
443{
444 int sess_held = atomic_read(&sess->kref.refcount);
445
446 BUG_ON(!sess_held);
447 kref_put(&sess->kref, ft_sess_free);
448}
449
450static void ft_prlo(struct fc_rport_priv *rdata)
451{
452 struct ft_sess *sess;
453 struct ft_tport *tport;
454
455 mutex_lock(&ft_lport_lock);
456 tport = rcu_dereference_protected(rdata->local_port->prov[FC_TYPE_FCP],
457 lockdep_is_held(&ft_lport_lock));
458
459 if (!tport) {
460 mutex_unlock(&ft_lport_lock);
461 return;
462 }
463 sess = ft_sess_delete(tport, rdata->ids.port_id);
464 if (!sess) {
465 mutex_unlock(&ft_lport_lock);
466 return;
467 }
468 mutex_unlock(&ft_lport_lock);
469 transport_deregister_session_configfs(sess->se_sess);
470 ft_sess_put(sess);
471 rdata->prli_count--;
472
473}
474
475
476
477
478
479static void ft_recv(struct fc_lport *lport, struct fc_frame *fp)
480{
481 struct ft_sess *sess;
482 u32 sid = fc_frame_sid(fp);
483
484 pr_debug("sid %x\n", sid);
485
486 sess = ft_sess_get(lport, sid);
487 if (!sess) {
488 pr_debug("sid %x sess lookup failed\n", sid);
489
490 fc_frame_free(fp);
491 return;
492 }
493 ft_recv_req(sess, fp);
494}
495
496
497
498
499struct fc4_prov ft_prov = {
500 .prli = ft_prli,
501 .prlo = ft_prlo,
502 .recv = ft_recv,
503 .module = THIS_MODULE,
504};
505