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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 RL |
37 | #include <linux/err.h> |
38 | #include <asm/unaligned.h> | |
39 | ||
40 | #include <scsi/fc/fc_gs.h> | |
41 | ||
42 | #include <scsi/libfc.h> | |
43 | ||
8866a5d9 RL |
44 | #include "fc_libfc.h" |
45 | ||
42e9a92f RL |
46 | #define FC_DISC_RETRY_LIMIT 3 /* max retries */ |
47 | #define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */ | |
48 | ||
42e9a92f RL |
49 | static void fc_disc_gpn_ft_req(struct fc_disc *); |
50 | static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *); | |
786681b9 | 51 | static void fc_disc_done(struct fc_disc *, enum fc_disc_event); |
42e9a92f | 52 | static void fc_disc_timeout(struct work_struct *); |
2ab7e1ec | 53 | static int fc_disc_single(struct fc_lport *, struct fc_disc_port *); |
42e9a92f RL |
54 | static void fc_disc_restart(struct fc_disc *); |
55 | ||
42e9a92f | 56 | /** |
3a3b42bf RL |
57 | * fc_disc_stop_rports() - Delete all the remote ports associated with the lport |
58 | * @disc: The discovery job to stop remote ports on | |
42e9a92f RL |
59 | * |
60 | * Locking Note: This function expects that the lport mutex is locked before | |
61 | * calling it. | |
62 | */ | |
63 | void fc_disc_stop_rports(struct fc_disc *disc) | |
64 | { | |
65 | struct fc_lport *lport; | |
42e90414 | 66 | struct fc_rport_priv *rdata; |
42e9a92f | 67 | |
0685230c | 68 | lport = fc_disc_lport(disc); |
42e9a92f RL |
69 | |
70 | mutex_lock(&disc->disc_mutex); | |
42e90414 | 71 | list_for_each_entry_rcu(rdata, &disc->rports, peers) |
9fb9d328 | 72 | lport->tt.rport_logoff(rdata); |
42e9a92f RL |
73 | mutex_unlock(&disc->disc_mutex); |
74 | } | |
75 | ||
42e9a92f | 76 | /** |
34f42a07 | 77 | * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN) |
92261156 | 78 | * @disc: The discovery object to which the RSCN applies |
3a3b42bf | 79 | * @fp: The RSCN frame |
42e9a92f RL |
80 | * |
81 | * Locking Note: This function expects that the disc_mutex is locked | |
82 | * before it is called. | |
83 | */ | |
92261156 | 84 | static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp) |
42e9a92f RL |
85 | { |
86 | struct fc_lport *lport; | |
42e9a92f RL |
87 | struct fc_els_rscn *rp; |
88 | struct fc_els_rscn_page *pp; | |
89 | struct fc_seq_els_data rjt_data; | |
90 | unsigned int len; | |
91 | int redisc = 0; | |
92 | enum fc_els_rscn_ev_qual ev_qual; | |
93 | enum fc_els_rscn_addr_fmt fmt; | |
94 | LIST_HEAD(disc_ports); | |
95 | struct fc_disc_port *dp, *next; | |
96 | ||
0685230c | 97 | lport = fc_disc_lport(disc); |
42e9a92f | 98 | |
7414705e | 99 | FC_DISC_DBG(disc, "Received an RSCN event\n"); |
42e9a92f RL |
100 | |
101 | /* make sure the frame contains an RSCN message */ | |
102 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
103 | if (!rp) | |
104 | goto reject; | |
105 | /* make sure the page length is as expected (4 bytes) */ | |
106 | if (rp->rscn_page_len != sizeof(*pp)) | |
107 | goto reject; | |
108 | /* get the RSCN payload length */ | |
109 | len = ntohs(rp->rscn_plen); | |
110 | if (len < sizeof(*rp)) | |
111 | goto reject; | |
112 | /* make sure the frame contains the expected payload */ | |
113 | rp = fc_frame_payload_get(fp, len); | |
114 | if (!rp) | |
115 | goto reject; | |
116 | /* payload must be a multiple of the RSCN page size */ | |
117 | len -= sizeof(*rp); | |
118 | if (len % sizeof(*pp)) | |
119 | goto reject; | |
120 | ||
121 | for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) { | |
122 | ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT; | |
123 | ev_qual &= ELS_RSCN_EV_QUAL_MASK; | |
124 | fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT; | |
125 | fmt &= ELS_RSCN_ADDR_FMT_MASK; | |
126 | /* | |
127 | * if we get an address format other than port | |
128 | * (area, domain, fabric), then do a full discovery | |
129 | */ | |
130 | switch (fmt) { | |
131 | case ELS_ADDR_FMT_PORT: | |
7414705e | 132 | FC_DISC_DBG(disc, "Port address format for port " |
ce8b5df0 | 133 | "(%6.6x)\n", ntoh24(pp->rscn_fid)); |
42e9a92f RL |
134 | dp = kzalloc(sizeof(*dp), GFP_KERNEL); |
135 | if (!dp) { | |
136 | redisc = 1; | |
137 | break; | |
138 | } | |
139 | dp->lp = lport; | |
9737e6a7 | 140 | dp->port_id = ntoh24(pp->rscn_fid); |
42e9a92f RL |
141 | list_add_tail(&dp->peers, &disc_ports); |
142 | break; | |
143 | case ELS_ADDR_FMT_AREA: | |
144 | case ELS_ADDR_FMT_DOM: | |
145 | case ELS_ADDR_FMT_FAB: | |
146 | default: | |
7414705e | 147 | FC_DISC_DBG(disc, "Address format is (%d)\n", fmt); |
42e9a92f RL |
148 | redisc = 1; |
149 | break; | |
150 | } | |
151 | } | |
92261156 | 152 | lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL); |
2ab7e1ec JE |
153 | |
154 | /* | |
155 | * If not doing a complete rediscovery, do GPN_ID on | |
156 | * the individual ports mentioned in the list. | |
157 | * If any of these get an error, do a full rediscovery. | |
158 | * In any case, go through the list and free the entries. | |
159 | */ | |
160 | list_for_each_entry_safe(dp, next, &disc_ports, peers) { | |
161 | list_del(&dp->peers); | |
162 | if (!redisc) | |
163 | redisc = fc_disc_single(lport, dp); | |
164 | kfree(dp); | |
165 | } | |
42e9a92f | 166 | if (redisc) { |
7414705e | 167 | FC_DISC_DBG(disc, "RSCN received: rediscovering\n"); |
42e9a92f RL |
168 | fc_disc_restart(disc); |
169 | } else { | |
7414705e RL |
170 | FC_DISC_DBG(disc, "RSCN received: not rediscovering. " |
171 | "redisc %d state %d in_prog %d\n", | |
172 | redisc, lport->state, disc->pending); | |
42e9a92f RL |
173 | } |
174 | fc_frame_free(fp); | |
175 | return; | |
176 | reject: | |
7414705e | 177 | FC_DISC_DBG(disc, "Received a bad RSCN frame\n"); |
42e9a92f RL |
178 | rjt_data.reason = ELS_RJT_LOGIC; |
179 | rjt_data.explan = ELS_EXPL_NONE; | |
92261156 | 180 | lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); |
42e9a92f RL |
181 | fc_frame_free(fp); |
182 | } | |
183 | ||
184 | /** | |
34f42a07 | 185 | * fc_disc_recv_req() - Handle incoming requests |
3a3b42bf | 186 | * @lport: The local port receiving the request |
92261156 | 187 | * @fp: The request frame |
42e9a92f RL |
188 | * |
189 | * Locking Note: This function is called from the EM and will lock | |
190 | * the disc_mutex before calling the handler for the | |
191 | * request. | |
192 | */ | |
92261156 | 193 | static void fc_disc_recv_req(struct fc_lport *lport, struct fc_frame *fp) |
42e9a92f RL |
194 | { |
195 | u8 op; | |
196 | struct fc_disc *disc = &lport->disc; | |
197 | ||
198 | op = fc_frame_payload_op(fp); | |
199 | switch (op) { | |
200 | case ELS_RSCN: | |
201 | mutex_lock(&disc->disc_mutex); | |
92261156 | 202 | fc_disc_recv_rscn_req(disc, fp); |
42e9a92f RL |
203 | mutex_unlock(&disc->disc_mutex); |
204 | break; | |
205 | default: | |
7414705e RL |
206 | FC_DISC_DBG(disc, "Received an unsupported request, " |
207 | "the opcode is (%x)\n", op); | |
83383dd1 | 208 | fc_frame_free(fp); |
42e9a92f RL |
209 | break; |
210 | } | |
211 | } | |
212 | ||
213 | /** | |
34f42a07 | 214 | * fc_disc_restart() - Restart discovery |
3a3b42bf | 215 | * @disc: The discovery object to be restarted |
42e9a92f RL |
216 | * |
217 | * Locking Note: This function expects that the disc mutex | |
218 | * is already locked. | |
219 | */ | |
220 | static void fc_disc_restart(struct fc_disc *disc) | |
221 | { | |
935d0fce JE |
222 | if (!disc->disc_callback) |
223 | return; | |
224 | ||
7414705e | 225 | FC_DISC_DBG(disc, "Restarting discovery\n"); |
42e9a92f | 226 | |
42e9a92f | 227 | disc->requested = 1; |
0f6c6149 JE |
228 | if (disc->pending) |
229 | return; | |
230 | ||
231 | /* | |
232 | * Advance disc_id. This is an arbitrary non-zero number that will | |
233 | * match the value in the fc_rport_priv after discovery for all | |
234 | * freshly-discovered remote ports. Avoid wrapping to zero. | |
235 | */ | |
236 | disc->disc_id = (disc->disc_id + 2) | 1; | |
3667d7e7 | 237 | disc->retry_count = 0; |
0f6c6149 | 238 | fc_disc_gpn_ft_req(disc); |
42e9a92f RL |
239 | } |
240 | ||
241 | /** | |
3a3b42bf RL |
242 | * fc_disc_start() - Start discovery on a local port |
243 | * @lport: The local port to have discovery started on | |
244 | * @disc_callback: Callback function to be called when discovery is complete | |
42e9a92f RL |
245 | */ |
246 | static void fc_disc_start(void (*disc_callback)(struct fc_lport *, | |
247 | enum fc_disc_event), | |
248 | struct fc_lport *lport) | |
249 | { | |
42e9a92f RL |
250 | struct fc_disc *disc = &lport->disc; |
251 | ||
252 | /* | |
253 | * At this point we may have a new disc job or an existing | |
254 | * one. Either way, let's lock when we make changes to it | |
255 | * and send the GPN_FT request. | |
256 | */ | |
257 | mutex_lock(&disc->disc_mutex); | |
42e9a92f | 258 | disc->disc_callback = disc_callback; |
29d898e9 | 259 | fc_disc_restart(disc); |
42e9a92f RL |
260 | mutex_unlock(&disc->disc_mutex); |
261 | } | |
262 | ||
42e9a92f | 263 | /** |
34f42a07 | 264 | * fc_disc_done() - Discovery has been completed |
3a3b42bf RL |
265 | * @disc: The discovery context |
266 | * @event: The discovery completion status | |
786681b9 | 267 | * |
0d228c0f AJ |
268 | * Locking Note: This function expects that the disc mutex is locked before |
269 | * it is called. The discovery callback is then made with the lock released, | |
270 | * and the lock is re-taken before returning from this function | |
42e9a92f | 271 | */ |
786681b9 | 272 | static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event) |
42e9a92f | 273 | { |
0685230c | 274 | struct fc_lport *lport = fc_disc_lport(disc); |
0f6c6149 | 275 | struct fc_rport_priv *rdata; |
42e9a92f | 276 | |
7414705e | 277 | FC_DISC_DBG(disc, "Discovery complete\n"); |
42e9a92f | 278 | |
0f6c6149 JE |
279 | disc->pending = 0; |
280 | if (disc->requested) { | |
281 | fc_disc_restart(disc); | |
282 | return; | |
283 | } | |
284 | ||
285 | /* | |
3a3b42bf RL |
286 | * Go through all remote ports. If they were found in the latest |
287 | * discovery, reverify or log them in. Otherwise, log them out. | |
0f6c6149 JE |
288 | * Skip ports which were never discovered. These are the dNS port |
289 | * and ports which were created by PLOGI. | |
290 | */ | |
42e90414 | 291 | list_for_each_entry_rcu(rdata, &disc->rports, peers) { |
0f6c6149 JE |
292 | if (!rdata->disc_id) |
293 | continue; | |
294 | if (rdata->disc_id == disc->disc_id) | |
295 | lport->tt.rport_login(rdata); | |
296 | else | |
297 | lport->tt.rport_logoff(rdata); | |
298 | } | |
0d228c0f AJ |
299 | |
300 | mutex_unlock(&disc->disc_mutex); | |
301 | disc->disc_callback(lport, event); | |
302 | mutex_lock(&disc->disc_mutex); | |
42e9a92f RL |
303 | } |
304 | ||
305 | /** | |
34f42a07 | 306 | * fc_disc_error() - Handle error on dNS request |
3a3b42bf RL |
307 | * @disc: The discovery context |
308 | * @fp: The error code encoded as a frame pointer | |
42e9a92f RL |
309 | */ |
310 | static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp) | |
311 | { | |
0685230c | 312 | struct fc_lport *lport = fc_disc_lport(disc); |
42e9a92f | 313 | unsigned long delay = 0; |
7414705e RL |
314 | |
315 | FC_DISC_DBG(disc, "Error %ld, retries %d/%d\n", | |
316 | PTR_ERR(fp), disc->retry_count, | |
317 | FC_DISC_RETRY_LIMIT); | |
42e9a92f RL |
318 | |
319 | if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { | |
320 | /* | |
321 | * Memory allocation failure, or the exchange timed out, | |
322 | * retry after delay. | |
323 | */ | |
324 | if (disc->retry_count < FC_DISC_RETRY_LIMIT) { | |
325 | /* go ahead and retry */ | |
326 | if (!fp) | |
327 | delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY); | |
328 | else { | |
329 | delay = msecs_to_jiffies(lport->e_d_tov); | |
330 | ||
331 | /* timeout faster first time */ | |
332 | if (!disc->retry_count) | |
333 | delay /= 4; | |
334 | } | |
335 | disc->retry_count++; | |
336 | schedule_delayed_work(&disc->disc_work, delay); | |
786681b9 JE |
337 | } else |
338 | fc_disc_done(disc, DISC_EV_FAILED); | |
42e9a92f RL |
339 | } |
340 | } | |
341 | ||
342 | /** | |
34f42a07 | 343 | * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request |
3a3b42bf | 344 | * @lport: The discovery context |
42e9a92f RL |
345 | * |
346 | * Locking Note: This function expects that the disc_mutex is locked | |
347 | * before it is called. | |
348 | */ | |
349 | static void fc_disc_gpn_ft_req(struct fc_disc *disc) | |
350 | { | |
351 | struct fc_frame *fp; | |
0685230c | 352 | struct fc_lport *lport = fc_disc_lport(disc); |
42e9a92f RL |
353 | |
354 | WARN_ON(!fc_lport_test_ready(lport)); | |
355 | ||
356 | disc->pending = 1; | |
357 | disc->requested = 0; | |
358 | ||
359 | disc->buf_len = 0; | |
360 | disc->seq_count = 0; | |
361 | fp = fc_frame_alloc(lport, | |
362 | sizeof(struct fc_ct_hdr) + | |
363 | sizeof(struct fc_ns_gid_ft)); | |
364 | if (!fp) | |
365 | goto err; | |
366 | ||
a46f327a | 367 | if (lport->tt.elsct_send(lport, 0, fp, |
42e9a92f RL |
368 | FC_NS_GPN_FT, |
369 | fc_disc_gpn_ft_resp, | |
b94f8951 | 370 | disc, 3 * lport->r_a_tov)) |
42e9a92f RL |
371 | return; |
372 | err: | |
8f550f93 | 373 | fc_disc_error(disc, NULL); |
42e9a92f RL |
374 | } |
375 | ||
376 | /** | |
786681b9 | 377 | * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response. |
3a3b42bf RL |
378 | * @lport: The local port the GPN_FT was received on |
379 | * @buf: The GPN_FT response buffer | |
380 | * @len: The size of response buffer | |
786681b9 JE |
381 | * |
382 | * Goes through the list of IDs and names resulting from a request. | |
42e9a92f RL |
383 | */ |
384 | static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len) | |
385 | { | |
386 | struct fc_lport *lport; | |
387 | struct fc_gpn_ft_resp *np; | |
388 | char *bp; | |
389 | size_t plen; | |
390 | size_t tlen; | |
391 | int error = 0; | |
795d86f5 | 392 | struct fc_rport_identifiers ids; |
ab28f1fd | 393 | struct fc_rport_priv *rdata; |
42e9a92f | 394 | |
0685230c | 395 | lport = fc_disc_lport(disc); |
a1c1e4e7 | 396 | disc->seq_count++; |
42e9a92f RL |
397 | |
398 | /* | |
399 | * Handle partial name record left over from previous call. | |
400 | */ | |
401 | bp = buf; | |
402 | plen = len; | |
403 | np = (struct fc_gpn_ft_resp *)bp; | |
404 | tlen = disc->buf_len; | |
81a67b97 | 405 | disc->buf_len = 0; |
42e9a92f RL |
406 | if (tlen) { |
407 | WARN_ON(tlen >= sizeof(*np)); | |
408 | plen = sizeof(*np) - tlen; | |
409 | WARN_ON(plen <= 0); | |
410 | WARN_ON(plen >= sizeof(*np)); | |
411 | if (plen > len) | |
412 | plen = len; | |
413 | np = &disc->partial_buf; | |
414 | memcpy((char *)np + tlen, bp, plen); | |
415 | ||
416 | /* | |
417 | * Set bp so that the loop below will advance it to the | |
418 | * first valid full name element. | |
419 | */ | |
420 | bp -= tlen; | |
421 | len += tlen; | |
422 | plen += tlen; | |
423 | disc->buf_len = (unsigned char) plen; | |
424 | if (plen == sizeof(*np)) | |
425 | disc->buf_len = 0; | |
426 | } | |
427 | ||
428 | /* | |
429 | * Handle full name records, including the one filled from above. | |
430 | * Normally, np == bp and plen == len, but from the partial case above, | |
431 | * bp, len describe the overall buffer, and np, plen describe the | |
432 | * partial buffer, which if would usually be full now. | |
433 | * After the first time through the loop, things return to "normal". | |
434 | */ | |
435 | while (plen >= sizeof(*np)) { | |
795d86f5 JE |
436 | ids.port_id = ntoh24(np->fp_fid); |
437 | ids.port_name = ntohll(np->fp_wwpn); | |
795d86f5 | 438 | |
7b2787ec | 439 | if (ids.port_id != lport->port_id && |
795d86f5 | 440 | ids.port_name != lport->wwpn) { |
9737e6a7 RL |
441 | rdata = lport->tt.rport_create(lport, ids.port_id); |
442 | if (rdata) { | |
443 | rdata->ids.port_name = ids.port_name; | |
0f6c6149 | 444 | rdata->disc_id = disc->disc_id; |
9737e6a7 | 445 | } else { |
7414705e RL |
446 | printk(KERN_WARNING "libfc: Failed to allocate " |
447 | "memory for the newly discovered port " | |
ce8b5df0 | 448 | "(%6.6x)\n", ids.port_id); |
81a67b97 JE |
449 | error = -ENOMEM; |
450 | } | |
42e9a92f RL |
451 | } |
452 | ||
453 | if (np->fp_flags & FC_NS_FID_LAST) { | |
786681b9 | 454 | fc_disc_done(disc, DISC_EV_SUCCESS); |
42e9a92f RL |
455 | len = 0; |
456 | break; | |
457 | } | |
458 | len -= sizeof(*np); | |
459 | bp += sizeof(*np); | |
460 | np = (struct fc_gpn_ft_resp *)bp; | |
461 | plen = len; | |
462 | } | |
463 | ||
464 | /* | |
465 | * Save any partial record at the end of the buffer for next time. | |
466 | */ | |
467 | if (error == 0 && len > 0 && len < sizeof(*np)) { | |
468 | if (np != &disc->partial_buf) { | |
7414705e RL |
469 | FC_DISC_DBG(disc, "Partial buffer remains " |
470 | "for discovery\n"); | |
42e9a92f RL |
471 | memcpy(&disc->partial_buf, np, len); |
472 | } | |
473 | disc->buf_len = (unsigned char) len; | |
42e9a92f RL |
474 | } |
475 | return error; | |
476 | } | |
477 | ||
34f42a07 | 478 | /** |
3a3b42bf RL |
479 | * fc_disc_timeout() - Handler for discovery timeouts |
480 | * @work: Structure holding discovery context that needs to retry discovery | |
42e9a92f RL |
481 | */ |
482 | static void fc_disc_timeout(struct work_struct *work) | |
483 | { | |
484 | struct fc_disc *disc = container_of(work, | |
485 | struct fc_disc, | |
486 | disc_work.work); | |
487 | mutex_lock(&disc->disc_mutex); | |
3667d7e7 | 488 | fc_disc_gpn_ft_req(disc); |
42e9a92f RL |
489 | mutex_unlock(&disc->disc_mutex); |
490 | } | |
491 | ||
492 | /** | |
34f42a07 | 493 | * fc_disc_gpn_ft_resp() - Handle a response frame from Get Port Names (GPN_FT) |
3a3b42bf RL |
494 | * @sp: The sequence that the GPN_FT response was received on |
495 | * @fp: The GPN_FT response frame | |
496 | * @lp_arg: The discovery context | |
42e9a92f | 497 | * |
0d228c0f AJ |
498 | * Locking Note: This function is called without disc mutex held, and |
499 | * should do all its processing with the mutex held | |
42e9a92f RL |
500 | */ |
501 | static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp, | |
502 | void *disc_arg) | |
503 | { | |
504 | struct fc_disc *disc = disc_arg; | |
505 | struct fc_ct_hdr *cp; | |
506 | struct fc_frame_header *fh; | |
a1c1e4e7 | 507 | enum fc_disc_event event = DISC_EV_NONE; |
42e9a92f | 508 | unsigned int seq_cnt; |
42e9a92f | 509 | unsigned int len; |
a1c1e4e7 | 510 | int error = 0; |
42e9a92f | 511 | |
0d228c0f | 512 | mutex_lock(&disc->disc_mutex); |
7414705e | 513 | FC_DISC_DBG(disc, "Received a GPN_FT response\n"); |
42e9a92f RL |
514 | |
515 | if (IS_ERR(fp)) { | |
516 | fc_disc_error(disc, fp); | |
0d228c0f | 517 | mutex_unlock(&disc->disc_mutex); |
42e9a92f RL |
518 | return; |
519 | } | |
520 | ||
521 | WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */ | |
522 | fh = fc_frame_header_get(fp); | |
523 | len = fr_len(fp) - sizeof(*fh); | |
524 | seq_cnt = ntohs(fh->fh_seq_cnt); | |
a1c1e4e7 | 525 | if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) { |
42e9a92f RL |
526 | cp = fc_frame_payload_get(fp, sizeof(*cp)); |
527 | if (!cp) { | |
7414705e RL |
528 | FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n", |
529 | fr_len(fp)); | |
883a337c | 530 | event = DISC_EV_FAILED; |
42e9a92f RL |
531 | } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) { |
532 | ||
34f42a07 | 533 | /* Accepted, parse the response. */ |
42e9a92f | 534 | len -= sizeof(*cp); |
a1c1e4e7 | 535 | error = fc_disc_gpn_ft_parse(disc, cp + 1, len); |
42e9a92f | 536 | } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { |
7414705e RL |
537 | FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x " |
538 | "(check zoning)\n", cp->ct_reason, | |
539 | cp->ct_explan); | |
a1c1e4e7 | 540 | event = DISC_EV_FAILED; |
c762608b JE |
541 | if (cp->ct_reason == FC_FS_RJT_UNABL && |
542 | cp->ct_explan == FC_FS_EXP_FTNR) | |
543 | event = DISC_EV_SUCCESS; | |
42e9a92f | 544 | } else { |
7414705e RL |
545 | FC_DISC_DBG(disc, "GPN_FT unexpected response code " |
546 | "%x\n", ntohs(cp->ct_cmd)); | |
883a337c | 547 | event = DISC_EV_FAILED; |
42e9a92f | 548 | } |
a1c1e4e7 JE |
549 | } else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) { |
550 | error = fc_disc_gpn_ft_parse(disc, fh + 1, len); | |
42e9a92f | 551 | } else { |
7414705e RL |
552 | FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? " |
553 | "seq_cnt %x expected %x sof %x eof %x\n", | |
554 | seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp)); | |
883a337c | 555 | event = DISC_EV_FAILED; |
42e9a92f | 556 | } |
a1c1e4e7 JE |
557 | if (error) |
558 | fc_disc_error(disc, fp); | |
559 | else if (event != DISC_EV_NONE) | |
560 | fc_disc_done(disc, event); | |
42e9a92f | 561 | fc_frame_free(fp); |
0d228c0f | 562 | mutex_unlock(&disc->disc_mutex); |
42e9a92f RL |
563 | } |
564 | ||
565 | /** | |
2ab7e1ec | 566 | * fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID) |
3a3b42bf RL |
567 | * @sp: The sequence the GPN_ID is on |
568 | * @fp: The response frame | |
569 | * @rdata_arg: The remote port that sent the GPN_ID response | |
42e9a92f | 570 | * |
2ab7e1ec | 571 | * Locking Note: This function is called without disc mutex held. |
42e9a92f | 572 | */ |
2ab7e1ec JE |
573 | static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, |
574 | void *rdata_arg) | |
42e9a92f | 575 | { |
2ab7e1ec JE |
576 | struct fc_rport_priv *rdata = rdata_arg; |
577 | struct fc_rport_priv *new_rdata; | |
42e9a92f | 578 | struct fc_lport *lport; |
2ab7e1ec JE |
579 | struct fc_disc *disc; |
580 | struct fc_ct_hdr *cp; | |
581 | struct fc_ns_gid_pn *pn; | |
582 | u64 port_name; | |
42e9a92f | 583 | |
2ab7e1ec JE |
584 | lport = rdata->local_port; |
585 | disc = &lport->disc; | |
42e9a92f | 586 | |
2ab7e1ec JE |
587 | mutex_lock(&disc->disc_mutex); |
588 | if (PTR_ERR(fp) == -FC_EX_CLOSED) | |
42e9a92f | 589 | goto out; |
2ab7e1ec JE |
590 | if (IS_ERR(fp)) |
591 | goto redisc; | |
592 | ||
593 | cp = fc_frame_payload_get(fp, sizeof(*cp)); | |
594 | if (!cp) | |
595 | goto redisc; | |
596 | if (ntohs(cp->ct_cmd) == FC_FS_ACC) { | |
597 | if (fr_len(fp) < sizeof(struct fc_frame_header) + | |
598 | sizeof(*cp) + sizeof(*pn)) | |
599 | goto redisc; | |
600 | pn = (struct fc_ns_gid_pn *)(cp + 1); | |
601 | port_name = get_unaligned_be64(&pn->fn_wwpn); | |
602 | if (rdata->ids.port_name == -1) | |
603 | rdata->ids.port_name = port_name; | |
604 | else if (rdata->ids.port_name != port_name) { | |
605 | FC_DISC_DBG(disc, "GPN_ID accepted. WWPN changed. " | |
9f8f3aa6 | 606 | "Port-id %6.6x wwpn %16.16llx\n", |
2ab7e1ec JE |
607 | rdata->ids.port_id, port_name); |
608 | lport->tt.rport_logoff(rdata); | |
42e9a92f | 609 | |
2ab7e1ec JE |
610 | new_rdata = lport->tt.rport_create(lport, |
611 | rdata->ids.port_id); | |
612 | if (new_rdata) { | |
613 | new_rdata->disc_id = disc->disc_id; | |
614 | lport->tt.rport_login(new_rdata); | |
615 | } | |
616 | goto out; | |
617 | } | |
0f6c6149 | 618 | rdata->disc_id = disc->disc_id; |
9fb9d328 | 619 | lport->tt.rport_login(rdata); |
2ab7e1ec JE |
620 | } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { |
621 | FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n", | |
622 | cp->ct_reason, cp->ct_explan); | |
623 | lport->tt.rport_logoff(rdata); | |
624 | } else { | |
625 | FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n", | |
626 | ntohs(cp->ct_cmd)); | |
627 | redisc: | |
628 | fc_disc_restart(disc); | |
42e9a92f | 629 | } |
42e9a92f | 630 | out: |
2ab7e1ec JE |
631 | mutex_unlock(&disc->disc_mutex); |
632 | kref_put(&rdata->kref, lport->tt.rport_destroy); | |
633 | } | |
634 | ||
635 | /** | |
636 | * fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request | |
3a3b42bf | 637 | * @lport: The local port to initiate discovery on |
2ab7e1ec JE |
638 | * @rdata: remote port private data |
639 | * | |
640 | * Locking Note: This function expects that the disc_mutex is locked | |
641 | * before it is called. | |
642 | * On failure, an error code is returned. | |
643 | */ | |
644 | static int fc_disc_gpn_id_req(struct fc_lport *lport, | |
645 | struct fc_rport_priv *rdata) | |
646 | { | |
647 | struct fc_frame *fp; | |
648 | ||
649 | fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + | |
650 | sizeof(struct fc_ns_fid)); | |
651 | if (!fp) | |
652 | return -ENOMEM; | |
653 | if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID, | |
b94f8951 JE |
654 | fc_disc_gpn_id_resp, rdata, |
655 | 3 * lport->r_a_tov)) | |
2ab7e1ec JE |
656 | return -ENOMEM; |
657 | kref_get(&rdata->kref); | |
658 | return 0; | |
659 | } | |
660 | ||
661 | /** | |
662 | * fc_disc_single() - Discover the directory information for a single target | |
3a3b42bf RL |
663 | * @lport: The local port the remote port is associated with |
664 | * @dp: The port to rediscover | |
2ab7e1ec JE |
665 | * |
666 | * Locking Note: This function expects that the disc_mutex is locked | |
667 | * before it is called. | |
668 | */ | |
669 | static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp) | |
670 | { | |
671 | struct fc_rport_priv *rdata; | |
672 | ||
673 | rdata = lport->tt.rport_create(lport, dp->port_id); | |
674 | if (!rdata) | |
675 | return -ENOMEM; | |
676 | rdata->disc_id = 0; | |
677 | return fc_disc_gpn_id_req(lport, rdata); | |
42e9a92f RL |
678 | } |
679 | ||
680 | /** | |
34f42a07 | 681 | * fc_disc_stop() - Stop discovery for a given lport |
3a3b42bf | 682 | * @lport: The local port that discovery should stop on |
42e9a92f RL |
683 | */ |
684 | void fc_disc_stop(struct fc_lport *lport) | |
685 | { | |
686 | struct fc_disc *disc = &lport->disc; | |
687 | ||
c531b9b4 | 688 | if (disc->pending) |
42e9a92f | 689 | cancel_delayed_work_sync(&disc->disc_work); |
c531b9b4 | 690 | fc_disc_stop_rports(disc); |
42e9a92f RL |
691 | } |
692 | ||
693 | /** | |
34f42a07 | 694 | * fc_disc_stop_final() - Stop discovery for a given lport |
3a3b42bf | 695 | * @lport: The lport that discovery should stop on |
42e9a92f RL |
696 | * |
697 | * This function will block until discovery has been | |
698 | * completely stopped and all rports have been deleted. | |
699 | */ | |
700 | void fc_disc_stop_final(struct fc_lport *lport) | |
701 | { | |
702 | fc_disc_stop(lport); | |
703 | lport->tt.rport_flush_queue(); | |
704 | } | |
705 | ||
706 | /** | |
3a3b42bf RL |
707 | * fc_disc_init() - Initialize the discovery layer for a local port |
708 | * @lport: The local port that needs the discovery layer to be initialized | |
42e9a92f RL |
709 | */ |
710 | int fc_disc_init(struct fc_lport *lport) | |
711 | { | |
712 | struct fc_disc *disc; | |
713 | ||
714 | if (!lport->tt.disc_start) | |
715 | lport->tt.disc_start = fc_disc_start; | |
716 | ||
717 | if (!lport->tt.disc_stop) | |
718 | lport->tt.disc_stop = fc_disc_stop; | |
719 | ||
720 | if (!lport->tt.disc_stop_final) | |
721 | lport->tt.disc_stop_final = fc_disc_stop_final; | |
722 | ||
723 | if (!lport->tt.disc_recv_req) | |
724 | lport->tt.disc_recv_req = fc_disc_recv_req; | |
725 | ||
42e9a92f RL |
726 | disc = &lport->disc; |
727 | INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout); | |
728 | mutex_init(&disc->disc_mutex); | |
729 | INIT_LIST_HEAD(&disc->rports); | |
730 | ||
0685230c | 731 | disc->priv = lport; |
42e9a92f RL |
732 | |
733 | return 0; | |
734 | } | |
735 | EXPORT_SYMBOL(fc_disc_init); |