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42e9a92f RL |
1 | /* |
2 | * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. | |
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 | * Maintained at www.Open-FCoE.org | |
18 | */ | |
19 | ||
20 | /* | |
21 | * Target Discovery | |
22 | * | |
23 | * This block discovers all FC-4 remote ports, including FCP initiators. It | |
24 | * also handles RSCN events and re-discovery if necessary. | |
25 | */ | |
26 | ||
27 | /* | |
28 | * DISC LOCKING | |
29 | * | |
30 | * The disc mutex is can be locked when acquiring rport locks, but may not | |
31 | * be held when acquiring the lport lock. Refer to fc_lport.c for more | |
32 | * details. | |
33 | */ | |
34 | ||
35 | #include <linux/timer.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
42e9a92f | 37 | #include <linux/err.h> |
09703660 | 38 | #include <linux/export.h> |
b2d09103 IM |
39 | #include <linux/rculist.h> |
40 | ||
42e9a92f RL |
41 | #include <asm/unaligned.h> |
42 | ||
43 | #include <scsi/fc/fc_gs.h> | |
44 | ||
45 | #include <scsi/libfc.h> | |
46 | ||
8866a5d9 RL |
47 | #include "fc_libfc.h" |
48 | ||
42e9a92f RL |
49 | #define FC_DISC_RETRY_LIMIT 3 /* max retries */ |
50 | #define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */ | |
51 | ||
42e9a92f RL |
52 | static void fc_disc_gpn_ft_req(struct fc_disc *); |
53 | static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *); | |
786681b9 | 54 | static void fc_disc_done(struct fc_disc *, enum fc_disc_event); |
42e9a92f | 55 | static void fc_disc_timeout(struct work_struct *); |
2ab7e1ec | 56 | static int fc_disc_single(struct fc_lport *, struct fc_disc_port *); |
42e9a92f RL |
57 | static void fc_disc_restart(struct fc_disc *); |
58 | ||
42e9a92f | 59 | /** |
3a3b42bf RL |
60 | * fc_disc_stop_rports() - Delete all the remote ports associated with the lport |
61 | * @disc: The discovery job to stop remote ports on | |
42e9a92f RL |
62 | * |
63 | * Locking Note: This function expects that the lport mutex is locked before | |
64 | * calling it. | |
65 | */ | |
c6b21c93 | 66 | static void fc_disc_stop_rports(struct fc_disc *disc) |
42e9a92f RL |
67 | { |
68 | struct fc_lport *lport; | |
42e90414 | 69 | struct fc_rport_priv *rdata; |
42e9a92f | 70 | |
0685230c | 71 | lport = fc_disc_lport(disc); |
42e9a92f | 72 | |
a407c593 HR |
73 | rcu_read_lock(); |
74 | list_for_each_entry_rcu(rdata, &disc->rports, peers) { | |
75 | if (kref_get_unless_zero(&rdata->kref)) { | |
c96c792a | 76 | fc_rport_logoff(rdata); |
944ef968 | 77 | kref_put(&rdata->kref, fc_rport_destroy); |
a407c593 HR |
78 | } |
79 | } | |
80 | rcu_read_unlock(); | |
42e9a92f RL |
81 | } |
82 | ||
42e9a92f | 83 | /** |
34f42a07 | 84 | * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN) |
92261156 | 85 | * @disc: The discovery object to which the RSCN applies |
3a3b42bf | 86 | * @fp: The RSCN frame |
42e9a92f RL |
87 | * |
88 | * Locking Note: This function expects that the disc_mutex is locked | |
89 | * before it is called. | |
90 | */ | |
92261156 | 91 | static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp) |
42e9a92f RL |
92 | { |
93 | struct fc_lport *lport; | |
42e9a92f RL |
94 | struct fc_els_rscn *rp; |
95 | struct fc_els_rscn_page *pp; | |
96 | struct fc_seq_els_data rjt_data; | |
97 | unsigned int len; | |
98 | int redisc = 0; | |
99 | enum fc_els_rscn_ev_qual ev_qual; | |
100 | enum fc_els_rscn_addr_fmt fmt; | |
101 | LIST_HEAD(disc_ports); | |
102 | struct fc_disc_port *dp, *next; | |
103 | ||
0685230c | 104 | lport = fc_disc_lport(disc); |
42e9a92f | 105 | |
7414705e | 106 | FC_DISC_DBG(disc, "Received an RSCN event\n"); |
42e9a92f RL |
107 | |
108 | /* make sure the frame contains an RSCN message */ | |
109 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
110 | if (!rp) | |
111 | goto reject; | |
112 | /* make sure the page length is as expected (4 bytes) */ | |
113 | if (rp->rscn_page_len != sizeof(*pp)) | |
114 | goto reject; | |
115 | /* get the RSCN payload length */ | |
116 | len = ntohs(rp->rscn_plen); | |
117 | if (len < sizeof(*rp)) | |
118 | goto reject; | |
119 | /* make sure the frame contains the expected payload */ | |
120 | rp = fc_frame_payload_get(fp, len); | |
121 | if (!rp) | |
122 | goto reject; | |
123 | /* payload must be a multiple of the RSCN page size */ | |
124 | len -= sizeof(*rp); | |
125 | if (len % sizeof(*pp)) | |
126 | goto reject; | |
127 | ||
128 | for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) { | |
129 | ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT; | |
130 | ev_qual &= ELS_RSCN_EV_QUAL_MASK; | |
131 | fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT; | |
132 | fmt &= ELS_RSCN_ADDR_FMT_MASK; | |
133 | /* | |
134 | * if we get an address format other than port | |
135 | * (area, domain, fabric), then do a full discovery | |
136 | */ | |
137 | switch (fmt) { | |
138 | case ELS_ADDR_FMT_PORT: | |
7414705e | 139 | FC_DISC_DBG(disc, "Port address format for port " |
ce8b5df0 | 140 | "(%6.6x)\n", ntoh24(pp->rscn_fid)); |
42e9a92f RL |
141 | dp = kzalloc(sizeof(*dp), GFP_KERNEL); |
142 | if (!dp) { | |
143 | redisc = 1; | |
144 | break; | |
145 | } | |
146 | dp->lp = lport; | |
9737e6a7 | 147 | dp->port_id = ntoh24(pp->rscn_fid); |
42e9a92f RL |
148 | list_add_tail(&dp->peers, &disc_ports); |
149 | break; | |
150 | case ELS_ADDR_FMT_AREA: | |
151 | case ELS_ADDR_FMT_DOM: | |
152 | case ELS_ADDR_FMT_FAB: | |
153 | default: | |
7414705e | 154 | FC_DISC_DBG(disc, "Address format is (%d)\n", fmt); |
42e9a92f RL |
155 | redisc = 1; |
156 | break; | |
157 | } | |
158 | } | |
7ab24dd1 | 159 | fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL); |
2ab7e1ec JE |
160 | |
161 | /* | |
162 | * If not doing a complete rediscovery, do GPN_ID on | |
163 | * the individual ports mentioned in the list. | |
164 | * If any of these get an error, do a full rediscovery. | |
165 | * In any case, go through the list and free the entries. | |
166 | */ | |
167 | list_for_each_entry_safe(dp, next, &disc_ports, peers) { | |
168 | list_del(&dp->peers); | |
169 | if (!redisc) | |
170 | redisc = fc_disc_single(lport, dp); | |
171 | kfree(dp); | |
172 | } | |
42e9a92f | 173 | if (redisc) { |
7414705e | 174 | FC_DISC_DBG(disc, "RSCN received: rediscovering\n"); |
42e9a92f RL |
175 | fc_disc_restart(disc); |
176 | } else { | |
7414705e RL |
177 | FC_DISC_DBG(disc, "RSCN received: not rediscovering. " |
178 | "redisc %d state %d in_prog %d\n", | |
179 | redisc, lport->state, disc->pending); | |
42e9a92f RL |
180 | } |
181 | fc_frame_free(fp); | |
182 | return; | |
183 | reject: | |
7414705e | 184 | FC_DISC_DBG(disc, "Received a bad RSCN frame\n"); |
42e9a92f RL |
185 | rjt_data.reason = ELS_RJT_LOGIC; |
186 | rjt_data.explan = ELS_EXPL_NONE; | |
7ab24dd1 | 187 | fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); |
42e9a92f RL |
188 | fc_frame_free(fp); |
189 | } | |
190 | ||
191 | /** | |
34f42a07 | 192 | * fc_disc_recv_req() - Handle incoming requests |
3a3b42bf | 193 | * @lport: The local port receiving the request |
92261156 | 194 | * @fp: The request frame |
42e9a92f RL |
195 | * |
196 | * Locking Note: This function is called from the EM and will lock | |
197 | * the disc_mutex before calling the handler for the | |
198 | * request. | |
199 | */ | |
92261156 | 200 | static void fc_disc_recv_req(struct fc_lport *lport, struct fc_frame *fp) |
42e9a92f RL |
201 | { |
202 | u8 op; | |
203 | struct fc_disc *disc = &lport->disc; | |
204 | ||
205 | op = fc_frame_payload_op(fp); | |
206 | switch (op) { | |
207 | case ELS_RSCN: | |
208 | mutex_lock(&disc->disc_mutex); | |
92261156 | 209 | fc_disc_recv_rscn_req(disc, fp); |
42e9a92f RL |
210 | mutex_unlock(&disc->disc_mutex); |
211 | break; | |
212 | default: | |
7414705e RL |
213 | FC_DISC_DBG(disc, "Received an unsupported request, " |
214 | "the opcode is (%x)\n", op); | |
83383dd1 | 215 | fc_frame_free(fp); |
42e9a92f RL |
216 | break; |
217 | } | |
218 | } | |
219 | ||
220 | /** | |
34f42a07 | 221 | * fc_disc_restart() - Restart discovery |
3a3b42bf | 222 | * @disc: The discovery object to be restarted |
42e9a92f RL |
223 | * |
224 | * Locking Note: This function expects that the disc mutex | |
225 | * is already locked. | |
226 | */ | |
227 | static void fc_disc_restart(struct fc_disc *disc) | |
228 | { | |
935d0fce JE |
229 | if (!disc->disc_callback) |
230 | return; | |
231 | ||
7414705e | 232 | FC_DISC_DBG(disc, "Restarting discovery\n"); |
42e9a92f | 233 | |
42e9a92f | 234 | disc->requested = 1; |
0f6c6149 JE |
235 | if (disc->pending) |
236 | return; | |
237 | ||
238 | /* | |
239 | * Advance disc_id. This is an arbitrary non-zero number that will | |
240 | * match the value in the fc_rport_priv after discovery for all | |
241 | * freshly-discovered remote ports. Avoid wrapping to zero. | |
242 | */ | |
243 | disc->disc_id = (disc->disc_id + 2) | 1; | |
3667d7e7 | 244 | disc->retry_count = 0; |
0f6c6149 | 245 | fc_disc_gpn_ft_req(disc); |
42e9a92f RL |
246 | } |
247 | ||
248 | /** | |
3a3b42bf RL |
249 | * fc_disc_start() - Start discovery on a local port |
250 | * @lport: The local port to have discovery started on | |
251 | * @disc_callback: Callback function to be called when discovery is complete | |
42e9a92f RL |
252 | */ |
253 | static void fc_disc_start(void (*disc_callback)(struct fc_lport *, | |
254 | enum fc_disc_event), | |
255 | struct fc_lport *lport) | |
256 | { | |
42e9a92f RL |
257 | struct fc_disc *disc = &lport->disc; |
258 | ||
259 | /* | |
260 | * At this point we may have a new disc job or an existing | |
261 | * one. Either way, let's lock when we make changes to it | |
262 | * and send the GPN_FT request. | |
263 | */ | |
264 | mutex_lock(&disc->disc_mutex); | |
42e9a92f | 265 | disc->disc_callback = disc_callback; |
29d898e9 | 266 | fc_disc_restart(disc); |
42e9a92f RL |
267 | mutex_unlock(&disc->disc_mutex); |
268 | } | |
269 | ||
42e9a92f | 270 | /** |
34f42a07 | 271 | * fc_disc_done() - Discovery has been completed |
3a3b42bf RL |
272 | * @disc: The discovery context |
273 | * @event: The discovery completion status | |
786681b9 | 274 | * |
0d228c0f AJ |
275 | * Locking Note: This function expects that the disc mutex is locked before |
276 | * it is called. The discovery callback is then made with the lock released, | |
277 | * and the lock is re-taken before returning from this function | |
42e9a92f | 278 | */ |
786681b9 | 279 | static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event) |
42e9a92f | 280 | { |
0685230c | 281 | struct fc_lport *lport = fc_disc_lport(disc); |
0f6c6149 | 282 | struct fc_rport_priv *rdata; |
42e9a92f | 283 | |
7414705e | 284 | FC_DISC_DBG(disc, "Discovery complete\n"); |
42e9a92f | 285 | |
0f6c6149 JE |
286 | disc->pending = 0; |
287 | if (disc->requested) { | |
288 | fc_disc_restart(disc); | |
289 | return; | |
290 | } | |
291 | ||
292 | /* | |
3a3b42bf RL |
293 | * Go through all remote ports. If they were found in the latest |
294 | * discovery, reverify or log them in. Otherwise, log them out. | |
0f6c6149 JE |
295 | * Skip ports which were never discovered. These are the dNS port |
296 | * and ports which were created by PLOGI. | |
297 | */ | |
a407c593 | 298 | rcu_read_lock(); |
42e90414 | 299 | list_for_each_entry_rcu(rdata, &disc->rports, peers) { |
a407c593 | 300 | if (!kref_get_unless_zero(&rdata->kref)) |
0f6c6149 | 301 | continue; |
a407c593 HR |
302 | if (rdata->disc_id) { |
303 | if (rdata->disc_id == disc->disc_id) | |
05d7d3b0 | 304 | fc_rport_login(rdata); |
a407c593 | 305 | else |
c96c792a | 306 | fc_rport_logoff(rdata); |
a407c593 | 307 | } |
944ef968 | 308 | kref_put(&rdata->kref, fc_rport_destroy); |
0f6c6149 | 309 | } |
a407c593 | 310 | rcu_read_unlock(); |
0d228c0f AJ |
311 | mutex_unlock(&disc->disc_mutex); |
312 | disc->disc_callback(lport, event); | |
313 | mutex_lock(&disc->disc_mutex); | |
42e9a92f RL |
314 | } |
315 | ||
316 | /** | |
34f42a07 | 317 | * fc_disc_error() - Handle error on dNS request |
3a3b42bf RL |
318 | * @disc: The discovery context |
319 | * @fp: The error code encoded as a frame pointer | |
42e9a92f RL |
320 | */ |
321 | static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp) | |
322 | { | |
0685230c | 323 | struct fc_lport *lport = fc_disc_lport(disc); |
42e9a92f | 324 | unsigned long delay = 0; |
7414705e RL |
325 | |
326 | FC_DISC_DBG(disc, "Error %ld, retries %d/%d\n", | |
327 | PTR_ERR(fp), disc->retry_count, | |
328 | FC_DISC_RETRY_LIMIT); | |
42e9a92f RL |
329 | |
330 | if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { | |
331 | /* | |
332 | * Memory allocation failure, or the exchange timed out, | |
333 | * retry after delay. | |
334 | */ | |
335 | if (disc->retry_count < FC_DISC_RETRY_LIMIT) { | |
336 | /* go ahead and retry */ | |
337 | if (!fp) | |
338 | delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY); | |
339 | else { | |
340 | delay = msecs_to_jiffies(lport->e_d_tov); | |
341 | ||
342 | /* timeout faster first time */ | |
343 | if (!disc->retry_count) | |
344 | delay /= 4; | |
345 | } | |
346 | disc->retry_count++; | |
347 | schedule_delayed_work(&disc->disc_work, delay); | |
786681b9 JE |
348 | } else |
349 | fc_disc_done(disc, DISC_EV_FAILED); | |
00832084 BPG |
350 | } else if (PTR_ERR(fp) == -FC_EX_CLOSED) { |
351 | /* | |
352 | * if discovery fails due to lport reset, clear | |
353 | * pending flag so that subsequent discovery can | |
354 | * continue | |
355 | */ | |
356 | disc->pending = 0; | |
42e9a92f RL |
357 | } |
358 | } | |
359 | ||
360 | /** | |
34f42a07 | 361 | * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request |
3a3b42bf | 362 | * @lport: The discovery context |
42e9a92f RL |
363 | * |
364 | * Locking Note: This function expects that the disc_mutex is locked | |
365 | * before it is called. | |
366 | */ | |
367 | static void fc_disc_gpn_ft_req(struct fc_disc *disc) | |
368 | { | |
369 | struct fc_frame *fp; | |
0685230c | 370 | struct fc_lport *lport = fc_disc_lport(disc); |
42e9a92f RL |
371 | |
372 | WARN_ON(!fc_lport_test_ready(lport)); | |
373 | ||
374 | disc->pending = 1; | |
375 | disc->requested = 0; | |
376 | ||
377 | disc->buf_len = 0; | |
378 | disc->seq_count = 0; | |
379 | fp = fc_frame_alloc(lport, | |
380 | sizeof(struct fc_ct_hdr) + | |
381 | sizeof(struct fc_ns_gid_ft)); | |
382 | if (!fp) | |
383 | goto err; | |
384 | ||
a46f327a | 385 | if (lport->tt.elsct_send(lport, 0, fp, |
42e9a92f RL |
386 | FC_NS_GPN_FT, |
387 | fc_disc_gpn_ft_resp, | |
b94f8951 | 388 | disc, 3 * lport->r_a_tov)) |
42e9a92f RL |
389 | return; |
390 | err: | |
8f550f93 | 391 | fc_disc_error(disc, NULL); |
42e9a92f RL |
392 | } |
393 | ||
394 | /** | |
786681b9 | 395 | * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response. |
3a3b42bf RL |
396 | * @lport: The local port the GPN_FT was received on |
397 | * @buf: The GPN_FT response buffer | |
398 | * @len: The size of response buffer | |
786681b9 JE |
399 | * |
400 | * Goes through the list of IDs and names resulting from a request. | |
42e9a92f RL |
401 | */ |
402 | static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len) | |
403 | { | |
404 | struct fc_lport *lport; | |
405 | struct fc_gpn_ft_resp *np; | |
406 | char *bp; | |
407 | size_t plen; | |
408 | size_t tlen; | |
409 | int error = 0; | |
795d86f5 | 410 | struct fc_rport_identifiers ids; |
ab28f1fd | 411 | struct fc_rport_priv *rdata; |
42e9a92f | 412 | |
0685230c | 413 | lport = fc_disc_lport(disc); |
a1c1e4e7 | 414 | disc->seq_count++; |
42e9a92f RL |
415 | |
416 | /* | |
417 | * Handle partial name record left over from previous call. | |
418 | */ | |
419 | bp = buf; | |
420 | plen = len; | |
421 | np = (struct fc_gpn_ft_resp *)bp; | |
422 | tlen = disc->buf_len; | |
81a67b97 | 423 | disc->buf_len = 0; |
42e9a92f RL |
424 | if (tlen) { |
425 | WARN_ON(tlen >= sizeof(*np)); | |
426 | plen = sizeof(*np) - tlen; | |
427 | WARN_ON(plen <= 0); | |
428 | WARN_ON(plen >= sizeof(*np)); | |
429 | if (plen > len) | |
430 | plen = len; | |
431 | np = &disc->partial_buf; | |
432 | memcpy((char *)np + tlen, bp, plen); | |
433 | ||
434 | /* | |
435 | * Set bp so that the loop below will advance it to the | |
436 | * first valid full name element. | |
437 | */ | |
438 | bp -= tlen; | |
439 | len += tlen; | |
440 | plen += tlen; | |
441 | disc->buf_len = (unsigned char) plen; | |
442 | if (plen == sizeof(*np)) | |
443 | disc->buf_len = 0; | |
444 | } | |
445 | ||
446 | /* | |
447 | * Handle full name records, including the one filled from above. | |
448 | * Normally, np == bp and plen == len, but from the partial case above, | |
449 | * bp, len describe the overall buffer, and np, plen describe the | |
450 | * partial buffer, which if would usually be full now. | |
451 | * After the first time through the loop, things return to "normal". | |
452 | */ | |
453 | while (plen >= sizeof(*np)) { | |
795d86f5 JE |
454 | ids.port_id = ntoh24(np->fp_fid); |
455 | ids.port_name = ntohll(np->fp_wwpn); | |
795d86f5 | 456 | |
7b2787ec | 457 | if (ids.port_id != lport->port_id && |
795d86f5 | 458 | ids.port_name != lport->wwpn) { |
2580064b | 459 | rdata = fc_rport_create(lport, ids.port_id); |
9737e6a7 RL |
460 | if (rdata) { |
461 | rdata->ids.port_name = ids.port_name; | |
0f6c6149 | 462 | rdata->disc_id = disc->disc_id; |
9737e6a7 | 463 | } else { |
7414705e RL |
464 | printk(KERN_WARNING "libfc: Failed to allocate " |
465 | "memory for the newly discovered port " | |
ce8b5df0 | 466 | "(%6.6x)\n", ids.port_id); |
81a67b97 JE |
467 | error = -ENOMEM; |
468 | } | |
42e9a92f RL |
469 | } |
470 | ||
471 | if (np->fp_flags & FC_NS_FID_LAST) { | |
786681b9 | 472 | fc_disc_done(disc, DISC_EV_SUCCESS); |
42e9a92f RL |
473 | len = 0; |
474 | break; | |
475 | } | |
476 | len -= sizeof(*np); | |
477 | bp += sizeof(*np); | |
478 | np = (struct fc_gpn_ft_resp *)bp; | |
479 | plen = len; | |
480 | } | |
481 | ||
482 | /* | |
483 | * Save any partial record at the end of the buffer for next time. | |
484 | */ | |
485 | if (error == 0 && len > 0 && len < sizeof(*np)) { | |
486 | if (np != &disc->partial_buf) { | |
7414705e RL |
487 | FC_DISC_DBG(disc, "Partial buffer remains " |
488 | "for discovery\n"); | |
42e9a92f RL |
489 | memcpy(&disc->partial_buf, np, len); |
490 | } | |
491 | disc->buf_len = (unsigned char) len; | |
42e9a92f RL |
492 | } |
493 | return error; | |
494 | } | |
495 | ||
34f42a07 | 496 | /** |
3a3b42bf RL |
497 | * fc_disc_timeout() - Handler for discovery timeouts |
498 | * @work: Structure holding discovery context that needs to retry discovery | |
42e9a92f RL |
499 | */ |
500 | static void fc_disc_timeout(struct work_struct *work) | |
501 | { | |
502 | struct fc_disc *disc = container_of(work, | |
503 | struct fc_disc, | |
504 | disc_work.work); | |
505 | mutex_lock(&disc->disc_mutex); | |
3667d7e7 | 506 | fc_disc_gpn_ft_req(disc); |
42e9a92f RL |
507 | mutex_unlock(&disc->disc_mutex); |
508 | } | |
509 | ||
510 | /** | |
34f42a07 | 511 | * fc_disc_gpn_ft_resp() - Handle a response frame from Get Port Names (GPN_FT) |
3a3b42bf RL |
512 | * @sp: The sequence that the GPN_FT response was received on |
513 | * @fp: The GPN_FT response frame | |
514 | * @lp_arg: The discovery context | |
42e9a92f | 515 | * |
0d228c0f AJ |
516 | * Locking Note: This function is called without disc mutex held, and |
517 | * should do all its processing with the mutex held | |
42e9a92f RL |
518 | */ |
519 | static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp, | |
520 | void *disc_arg) | |
521 | { | |
522 | struct fc_disc *disc = disc_arg; | |
523 | struct fc_ct_hdr *cp; | |
524 | struct fc_frame_header *fh; | |
a1c1e4e7 | 525 | enum fc_disc_event event = DISC_EV_NONE; |
42e9a92f | 526 | unsigned int seq_cnt; |
42e9a92f | 527 | unsigned int len; |
a1c1e4e7 | 528 | int error = 0; |
42e9a92f | 529 | |
0d228c0f | 530 | mutex_lock(&disc->disc_mutex); |
7414705e | 531 | FC_DISC_DBG(disc, "Received a GPN_FT response\n"); |
42e9a92f RL |
532 | |
533 | if (IS_ERR(fp)) { | |
534 | fc_disc_error(disc, fp); | |
0d228c0f | 535 | mutex_unlock(&disc->disc_mutex); |
42e9a92f RL |
536 | return; |
537 | } | |
538 | ||
539 | WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */ | |
540 | fh = fc_frame_header_get(fp); | |
541 | len = fr_len(fp) - sizeof(*fh); | |
542 | seq_cnt = ntohs(fh->fh_seq_cnt); | |
a1c1e4e7 | 543 | if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) { |
42e9a92f RL |
544 | cp = fc_frame_payload_get(fp, sizeof(*cp)); |
545 | if (!cp) { | |
7414705e RL |
546 | FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n", |
547 | fr_len(fp)); | |
883a337c | 548 | event = DISC_EV_FAILED; |
42e9a92f RL |
549 | } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) { |
550 | ||
34f42a07 | 551 | /* Accepted, parse the response. */ |
42e9a92f | 552 | len -= sizeof(*cp); |
a1c1e4e7 | 553 | error = fc_disc_gpn_ft_parse(disc, cp + 1, len); |
42e9a92f | 554 | } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { |
7414705e RL |
555 | FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x " |
556 | "(check zoning)\n", cp->ct_reason, | |
557 | cp->ct_explan); | |
a1c1e4e7 | 558 | event = DISC_EV_FAILED; |
c762608b JE |
559 | if (cp->ct_reason == FC_FS_RJT_UNABL && |
560 | cp->ct_explan == FC_FS_EXP_FTNR) | |
561 | event = DISC_EV_SUCCESS; | |
42e9a92f | 562 | } else { |
7414705e RL |
563 | FC_DISC_DBG(disc, "GPN_FT unexpected response code " |
564 | "%x\n", ntohs(cp->ct_cmd)); | |
883a337c | 565 | event = DISC_EV_FAILED; |
42e9a92f | 566 | } |
a1c1e4e7 JE |
567 | } else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) { |
568 | error = fc_disc_gpn_ft_parse(disc, fh + 1, len); | |
42e9a92f | 569 | } else { |
7414705e RL |
570 | FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? " |
571 | "seq_cnt %x expected %x sof %x eof %x\n", | |
572 | seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp)); | |
883a337c | 573 | event = DISC_EV_FAILED; |
42e9a92f | 574 | } |
a1c1e4e7 JE |
575 | if (error) |
576 | fc_disc_error(disc, fp); | |
577 | else if (event != DISC_EV_NONE) | |
578 | fc_disc_done(disc, event); | |
42e9a92f | 579 | fc_frame_free(fp); |
0d228c0f | 580 | mutex_unlock(&disc->disc_mutex); |
42e9a92f RL |
581 | } |
582 | ||
583 | /** | |
2ab7e1ec | 584 | * fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID) |
3a3b42bf RL |
585 | * @sp: The sequence the GPN_ID is on |
586 | * @fp: The response frame | |
587 | * @rdata_arg: The remote port that sent the GPN_ID response | |
42e9a92f | 588 | * |
2ab7e1ec | 589 | * Locking Note: This function is called without disc mutex held. |
42e9a92f | 590 | */ |
2ab7e1ec JE |
591 | static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, |
592 | void *rdata_arg) | |
42e9a92f | 593 | { |
2ab7e1ec JE |
594 | struct fc_rport_priv *rdata = rdata_arg; |
595 | struct fc_rport_priv *new_rdata; | |
42e9a92f | 596 | struct fc_lport *lport; |
2ab7e1ec JE |
597 | struct fc_disc *disc; |
598 | struct fc_ct_hdr *cp; | |
599 | struct fc_ns_gid_pn *pn; | |
600 | u64 port_name; | |
42e9a92f | 601 | |
2ab7e1ec JE |
602 | lport = rdata->local_port; |
603 | disc = &lport->disc; | |
42e9a92f | 604 | |
2ab7e1ec | 605 | if (PTR_ERR(fp) == -FC_EX_CLOSED) |
42e9a92f | 606 | goto out; |
2ab7e1ec JE |
607 | if (IS_ERR(fp)) |
608 | goto redisc; | |
609 | ||
610 | cp = fc_frame_payload_get(fp, sizeof(*cp)); | |
611 | if (!cp) | |
612 | goto redisc; | |
613 | if (ntohs(cp->ct_cmd) == FC_FS_ACC) { | |
614 | if (fr_len(fp) < sizeof(struct fc_frame_header) + | |
615 | sizeof(*cp) + sizeof(*pn)) | |
616 | goto redisc; | |
617 | pn = (struct fc_ns_gid_pn *)(cp + 1); | |
618 | port_name = get_unaligned_be64(&pn->fn_wwpn); | |
a407c593 | 619 | mutex_lock(&rdata->rp_mutex); |
2ab7e1ec JE |
620 | if (rdata->ids.port_name == -1) |
621 | rdata->ids.port_name = port_name; | |
622 | else if (rdata->ids.port_name != port_name) { | |
623 | FC_DISC_DBG(disc, "GPN_ID accepted. WWPN changed. " | |
9f8f3aa6 | 624 | "Port-id %6.6x wwpn %16.16llx\n", |
2ab7e1ec | 625 | rdata->ids.port_id, port_name); |
a407c593 | 626 | mutex_unlock(&rdata->rp_mutex); |
c96c792a | 627 | fc_rport_logoff(rdata); |
a407c593 | 628 | mutex_lock(&lport->disc.disc_mutex); |
2580064b | 629 | new_rdata = fc_rport_create(lport, rdata->ids.port_id); |
a407c593 | 630 | mutex_unlock(&lport->disc.disc_mutex); |
2ab7e1ec JE |
631 | if (new_rdata) { |
632 | new_rdata->disc_id = disc->disc_id; | |
05d7d3b0 | 633 | fc_rport_login(new_rdata); |
2ab7e1ec JE |
634 | } |
635 | goto out; | |
636 | } | |
0f6c6149 | 637 | rdata->disc_id = disc->disc_id; |
a407c593 | 638 | mutex_unlock(&rdata->rp_mutex); |
05d7d3b0 | 639 | fc_rport_login(rdata); |
2ab7e1ec JE |
640 | } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { |
641 | FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n", | |
642 | cp->ct_reason, cp->ct_explan); | |
c96c792a | 643 | fc_rport_logoff(rdata); |
2ab7e1ec JE |
644 | } else { |
645 | FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n", | |
646 | ntohs(cp->ct_cmd)); | |
647 | redisc: | |
a407c593 | 648 | mutex_lock(&disc->disc_mutex); |
2ab7e1ec | 649 | fc_disc_restart(disc); |
a407c593 | 650 | mutex_unlock(&disc->disc_mutex); |
42e9a92f | 651 | } |
42e9a92f | 652 | out: |
944ef968 | 653 | kref_put(&rdata->kref, fc_rport_destroy); |
2ab7e1ec JE |
654 | } |
655 | ||
656 | /** | |
657 | * fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request | |
3a3b42bf | 658 | * @lport: The local port to initiate discovery on |
2ab7e1ec JE |
659 | * @rdata: remote port private data |
660 | * | |
661 | * Locking Note: This function expects that the disc_mutex is locked | |
662 | * before it is called. | |
663 | * On failure, an error code is returned. | |
664 | */ | |
665 | static int fc_disc_gpn_id_req(struct fc_lport *lport, | |
666 | struct fc_rport_priv *rdata) | |
667 | { | |
668 | struct fc_frame *fp; | |
669 | ||
670 | fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + | |
671 | sizeof(struct fc_ns_fid)); | |
672 | if (!fp) | |
673 | return -ENOMEM; | |
674 | if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID, | |
b94f8951 JE |
675 | fc_disc_gpn_id_resp, rdata, |
676 | 3 * lport->r_a_tov)) | |
2ab7e1ec JE |
677 | return -ENOMEM; |
678 | kref_get(&rdata->kref); | |
679 | return 0; | |
680 | } | |
681 | ||
682 | /** | |
683 | * fc_disc_single() - Discover the directory information for a single target | |
3a3b42bf RL |
684 | * @lport: The local port the remote port is associated with |
685 | * @dp: The port to rediscover | |
2ab7e1ec JE |
686 | * |
687 | * Locking Note: This function expects that the disc_mutex is locked | |
688 | * before it is called. | |
689 | */ | |
690 | static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp) | |
691 | { | |
692 | struct fc_rport_priv *rdata; | |
693 | ||
2580064b | 694 | rdata = fc_rport_create(lport, dp->port_id); |
2ab7e1ec JE |
695 | if (!rdata) |
696 | return -ENOMEM; | |
697 | rdata->disc_id = 0; | |
698 | return fc_disc_gpn_id_req(lport, rdata); | |
42e9a92f RL |
699 | } |
700 | ||
701 | /** | |
34f42a07 | 702 | * fc_disc_stop() - Stop discovery for a given lport |
3a3b42bf | 703 | * @lport: The local port that discovery should stop on |
42e9a92f | 704 | */ |
c6b21c93 | 705 | static void fc_disc_stop(struct fc_lport *lport) |
42e9a92f RL |
706 | { |
707 | struct fc_disc *disc = &lport->disc; | |
708 | ||
c531b9b4 | 709 | if (disc->pending) |
42e9a92f | 710 | cancel_delayed_work_sync(&disc->disc_work); |
c531b9b4 | 711 | fc_disc_stop_rports(disc); |
42e9a92f RL |
712 | } |
713 | ||
714 | /** | |
34f42a07 | 715 | * fc_disc_stop_final() - Stop discovery for a given lport |
3a3b42bf | 716 | * @lport: The lport that discovery should stop on |
42e9a92f RL |
717 | * |
718 | * This function will block until discovery has been | |
719 | * completely stopped and all rports have been deleted. | |
720 | */ | |
c6b21c93 | 721 | static void fc_disc_stop_final(struct fc_lport *lport) |
42e9a92f RL |
722 | { |
723 | fc_disc_stop(lport); | |
5922a957 | 724 | fc_rport_flush_queue(); |
42e9a92f RL |
725 | } |
726 | ||
727 | /** | |
0807619d RL |
728 | * fc_disc_config() - Configure the discovery layer for a local port |
729 | * @lport: The local port that needs the discovery layer to be configured | |
8a9a7138 | 730 | * @priv: Private data structre for users of the discovery layer |
42e9a92f | 731 | */ |
0807619d | 732 | void fc_disc_config(struct fc_lport *lport, void *priv) |
42e9a92f | 733 | { |
0807619d | 734 | struct fc_disc *disc = &lport->disc; |
42e9a92f RL |
735 | |
736 | if (!lport->tt.disc_start) | |
737 | lport->tt.disc_start = fc_disc_start; | |
738 | ||
739 | if (!lport->tt.disc_stop) | |
740 | lport->tt.disc_stop = fc_disc_stop; | |
741 | ||
742 | if (!lport->tt.disc_stop_final) | |
743 | lport->tt.disc_stop_final = fc_disc_stop_final; | |
744 | ||
745 | if (!lport->tt.disc_recv_req) | |
746 | lport->tt.disc_recv_req = fc_disc_recv_req; | |
747 | ||
42e9a92f | 748 | disc = &lport->disc; |
42e9a92f | 749 | |
8a9a7138 | 750 | disc->priv = priv; |
0807619d RL |
751 | } |
752 | EXPORT_SYMBOL(fc_disc_config); | |
42e9a92f | 753 | |
0807619d RL |
754 | /** |
755 | * fc_disc_init() - Initialize the discovery layer for a local port | |
756 | * @lport: The local port that needs the discovery layer to be initialized | |
757 | */ | |
758 | void fc_disc_init(struct fc_lport *lport) | |
759 | { | |
760 | struct fc_disc *disc = &lport->disc; | |
761 | ||
762 | INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout); | |
763 | mutex_init(&disc->disc_mutex); | |
764 | INIT_LIST_HEAD(&disc->rports); | |
42e9a92f RL |
765 | } |
766 | EXPORT_SYMBOL(fc_disc_init); |