Commit | Line | Data |
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a61127c2 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
42e9a92f RL |
2 | /* |
3 | * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. | |
4 | * | |
42e9a92f RL |
5 | * Maintained at www.Open-FCoE.org |
6 | */ | |
7 | ||
8 | /* | |
9 | * Target Discovery | |
10 | * | |
11 | * This block discovers all FC-4 remote ports, including FCP initiators. It | |
12 | * also handles RSCN events and re-discovery if necessary. | |
13 | */ | |
14 | ||
15 | /* | |
16 | * DISC LOCKING | |
17 | * | |
18 | * The disc mutex is can be locked when acquiring rport locks, but may not | |
19 | * be held when acquiring the lport lock. Refer to fc_lport.c for more | |
20 | * details. | |
21 | */ | |
22 | ||
23 | #include <linux/timer.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
42e9a92f | 25 | #include <linux/err.h> |
09703660 | 26 | #include <linux/export.h> |
b2d09103 IM |
27 | #include <linux/rculist.h> |
28 | ||
42e9a92f RL |
29 | #include <asm/unaligned.h> |
30 | ||
31 | #include <scsi/fc/fc_gs.h> | |
32 | ||
33 | #include <scsi/libfc.h> | |
34 | ||
8866a5d9 RL |
35 | #include "fc_libfc.h" |
36 | ||
42e9a92f RL |
37 | #define FC_DISC_RETRY_LIMIT 3 /* max retries */ |
38 | #define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */ | |
39 | ||
42e9a92f RL |
40 | static void fc_disc_gpn_ft_req(struct fc_disc *); |
41 | static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *); | |
786681b9 | 42 | static void fc_disc_done(struct fc_disc *, enum fc_disc_event); |
42e9a92f | 43 | static void fc_disc_timeout(struct work_struct *); |
2ab7e1ec | 44 | static int fc_disc_single(struct fc_lport *, struct fc_disc_port *); |
42e9a92f RL |
45 | static void fc_disc_restart(struct fc_disc *); |
46 | ||
42e9a92f | 47 | /** |
3a3b42bf RL |
48 | * fc_disc_stop_rports() - Delete all the remote ports associated with the lport |
49 | * @disc: The discovery job to stop remote ports on | |
42e9a92f | 50 | */ |
c6b21c93 | 51 | static void fc_disc_stop_rports(struct fc_disc *disc) |
42e9a92f | 52 | { |
42e90414 | 53 | struct fc_rport_priv *rdata; |
42e9a92f | 54 | |
bc3d12b7 | 55 | lockdep_assert_held(&disc->disc_mutex); |
42e9a92f | 56 | |
bc3d12b7 | 57 | list_for_each_entry(rdata, &disc->rports, peers) { |
a407c593 | 58 | if (kref_get_unless_zero(&rdata->kref)) { |
c96c792a | 59 | fc_rport_logoff(rdata); |
944ef968 | 60 | kref_put(&rdata->kref, fc_rport_destroy); |
a407c593 HR |
61 | } |
62 | } | |
42e9a92f RL |
63 | } |
64 | ||
42e9a92f | 65 | /** |
34f42a07 | 66 | * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN) |
92261156 | 67 | * @disc: The discovery object to which the RSCN applies |
3a3b42bf | 68 | * @fp: The RSCN frame |
42e9a92f | 69 | */ |
92261156 | 70 | static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp) |
42e9a92f RL |
71 | { |
72 | struct fc_lport *lport; | |
42e9a92f RL |
73 | struct fc_els_rscn *rp; |
74 | struct fc_els_rscn_page *pp; | |
75 | struct fc_seq_els_data rjt_data; | |
76 | unsigned int len; | |
77 | int redisc = 0; | |
78 | enum fc_els_rscn_ev_qual ev_qual; | |
79 | enum fc_els_rscn_addr_fmt fmt; | |
80 | LIST_HEAD(disc_ports); | |
81 | struct fc_disc_port *dp, *next; | |
82 | ||
ee35624e HR |
83 | lockdep_assert_held(&disc->disc_mutex); |
84 | ||
0685230c | 85 | lport = fc_disc_lport(disc); |
42e9a92f | 86 | |
7414705e | 87 | FC_DISC_DBG(disc, "Received an RSCN event\n"); |
42e9a92f RL |
88 | |
89 | /* make sure the frame contains an RSCN message */ | |
90 | rp = fc_frame_payload_get(fp, sizeof(*rp)); | |
91 | if (!rp) | |
92 | goto reject; | |
93 | /* make sure the page length is as expected (4 bytes) */ | |
94 | if (rp->rscn_page_len != sizeof(*pp)) | |
95 | goto reject; | |
96 | /* get the RSCN payload length */ | |
97 | len = ntohs(rp->rscn_plen); | |
98 | if (len < sizeof(*rp)) | |
99 | goto reject; | |
100 | /* make sure the frame contains the expected payload */ | |
101 | rp = fc_frame_payload_get(fp, len); | |
102 | if (!rp) | |
103 | goto reject; | |
104 | /* payload must be a multiple of the RSCN page size */ | |
105 | len -= sizeof(*rp); | |
106 | if (len % sizeof(*pp)) | |
107 | goto reject; | |
108 | ||
109 | for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) { | |
110 | ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT; | |
111 | ev_qual &= ELS_RSCN_EV_QUAL_MASK; | |
112 | fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT; | |
113 | fmt &= ELS_RSCN_ADDR_FMT_MASK; | |
114 | /* | |
115 | * if we get an address format other than port | |
116 | * (area, domain, fabric), then do a full discovery | |
117 | */ | |
118 | switch (fmt) { | |
119 | case ELS_ADDR_FMT_PORT: | |
7414705e | 120 | FC_DISC_DBG(disc, "Port address format for port " |
ce8b5df0 | 121 | "(%6.6x)\n", ntoh24(pp->rscn_fid)); |
42e9a92f RL |
122 | dp = kzalloc(sizeof(*dp), GFP_KERNEL); |
123 | if (!dp) { | |
124 | redisc = 1; | |
125 | break; | |
126 | } | |
127 | dp->lp = lport; | |
9737e6a7 | 128 | dp->port_id = ntoh24(pp->rscn_fid); |
42e9a92f RL |
129 | list_add_tail(&dp->peers, &disc_ports); |
130 | break; | |
131 | case ELS_ADDR_FMT_AREA: | |
132 | case ELS_ADDR_FMT_DOM: | |
133 | case ELS_ADDR_FMT_FAB: | |
134 | default: | |
7414705e | 135 | FC_DISC_DBG(disc, "Address format is (%d)\n", fmt); |
42e9a92f RL |
136 | redisc = 1; |
137 | break; | |
138 | } | |
139 | } | |
7ab24dd1 | 140 | fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL); |
2ab7e1ec JE |
141 | |
142 | /* | |
143 | * If not doing a complete rediscovery, do GPN_ID on | |
144 | * the individual ports mentioned in the list. | |
145 | * If any of these get an error, do a full rediscovery. | |
146 | * In any case, go through the list and free the entries. | |
147 | */ | |
148 | list_for_each_entry_safe(dp, next, &disc_ports, peers) { | |
149 | list_del(&dp->peers); | |
150 | if (!redisc) | |
151 | redisc = fc_disc_single(lport, dp); | |
152 | kfree(dp); | |
153 | } | |
42e9a92f | 154 | if (redisc) { |
7414705e | 155 | FC_DISC_DBG(disc, "RSCN received: rediscovering\n"); |
42e9a92f RL |
156 | fc_disc_restart(disc); |
157 | } else { | |
7414705e RL |
158 | FC_DISC_DBG(disc, "RSCN received: not rediscovering. " |
159 | "redisc %d state %d in_prog %d\n", | |
160 | redisc, lport->state, disc->pending); | |
42e9a92f RL |
161 | } |
162 | fc_frame_free(fp); | |
163 | return; | |
164 | reject: | |
7414705e | 165 | FC_DISC_DBG(disc, "Received a bad RSCN frame\n"); |
42e9a92f RL |
166 | rjt_data.reason = ELS_RJT_LOGIC; |
167 | rjt_data.explan = ELS_EXPL_NONE; | |
7ab24dd1 | 168 | fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); |
42e9a92f RL |
169 | fc_frame_free(fp); |
170 | } | |
171 | ||
172 | /** | |
34f42a07 | 173 | * fc_disc_recv_req() - Handle incoming requests |
3a3b42bf | 174 | * @lport: The local port receiving the request |
92261156 | 175 | * @fp: The request frame |
42e9a92f RL |
176 | * |
177 | * Locking Note: This function is called from the EM and will lock | |
178 | * the disc_mutex before calling the handler for the | |
179 | * request. | |
180 | */ | |
92261156 | 181 | static void fc_disc_recv_req(struct fc_lport *lport, struct fc_frame *fp) |
42e9a92f RL |
182 | { |
183 | u8 op; | |
184 | struct fc_disc *disc = &lport->disc; | |
185 | ||
186 | op = fc_frame_payload_op(fp); | |
187 | switch (op) { | |
188 | case ELS_RSCN: | |
189 | mutex_lock(&disc->disc_mutex); | |
92261156 | 190 | fc_disc_recv_rscn_req(disc, fp); |
42e9a92f RL |
191 | mutex_unlock(&disc->disc_mutex); |
192 | break; | |
193 | default: | |
7414705e RL |
194 | FC_DISC_DBG(disc, "Received an unsupported request, " |
195 | "the opcode is (%x)\n", op); | |
83383dd1 | 196 | fc_frame_free(fp); |
42e9a92f RL |
197 | break; |
198 | } | |
199 | } | |
200 | ||
201 | /** | |
34f42a07 | 202 | * fc_disc_restart() - Restart discovery |
3a3b42bf | 203 | * @disc: The discovery object to be restarted |
42e9a92f RL |
204 | */ |
205 | static void fc_disc_restart(struct fc_disc *disc) | |
206 | { | |
ee35624e HR |
207 | lockdep_assert_held(&disc->disc_mutex); |
208 | ||
935d0fce JE |
209 | if (!disc->disc_callback) |
210 | return; | |
211 | ||
7414705e | 212 | FC_DISC_DBG(disc, "Restarting discovery\n"); |
42e9a92f | 213 | |
42e9a92f | 214 | disc->requested = 1; |
0f6c6149 JE |
215 | if (disc->pending) |
216 | return; | |
217 | ||
218 | /* | |
219 | * Advance disc_id. This is an arbitrary non-zero number that will | |
220 | * match the value in the fc_rport_priv after discovery for all | |
221 | * freshly-discovered remote ports. Avoid wrapping to zero. | |
222 | */ | |
223 | disc->disc_id = (disc->disc_id + 2) | 1; | |
3667d7e7 | 224 | disc->retry_count = 0; |
0f6c6149 | 225 | fc_disc_gpn_ft_req(disc); |
42e9a92f RL |
226 | } |
227 | ||
228 | /** | |
3a3b42bf RL |
229 | * fc_disc_start() - Start discovery on a local port |
230 | * @lport: The local port to have discovery started on | |
231 | * @disc_callback: Callback function to be called when discovery is complete | |
42e9a92f RL |
232 | */ |
233 | static void fc_disc_start(void (*disc_callback)(struct fc_lport *, | |
234 | enum fc_disc_event), | |
235 | struct fc_lport *lport) | |
236 | { | |
42e9a92f RL |
237 | struct fc_disc *disc = &lport->disc; |
238 | ||
239 | /* | |
240 | * At this point we may have a new disc job or an existing | |
241 | * one. Either way, let's lock when we make changes to it | |
242 | * and send the GPN_FT request. | |
243 | */ | |
244 | mutex_lock(&disc->disc_mutex); | |
42e9a92f | 245 | disc->disc_callback = disc_callback; |
29d898e9 | 246 | fc_disc_restart(disc); |
42e9a92f RL |
247 | mutex_unlock(&disc->disc_mutex); |
248 | } | |
249 | ||
42e9a92f | 250 | /** |
34f42a07 | 251 | * fc_disc_done() - Discovery has been completed |
3a3b42bf RL |
252 | * @disc: The discovery context |
253 | * @event: The discovery completion status | |
42e9a92f | 254 | */ |
786681b9 | 255 | static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event) |
42e9a92f | 256 | { |
0685230c | 257 | struct fc_lport *lport = fc_disc_lport(disc); |
0f6c6149 | 258 | struct fc_rport_priv *rdata; |
42e9a92f | 259 | |
ee35624e | 260 | lockdep_assert_held(&disc->disc_mutex); |
7414705e | 261 | FC_DISC_DBG(disc, "Discovery complete\n"); |
42e9a92f | 262 | |
0f6c6149 JE |
263 | disc->pending = 0; |
264 | if (disc->requested) { | |
265 | fc_disc_restart(disc); | |
266 | return; | |
267 | } | |
268 | ||
269 | /* | |
3a3b42bf RL |
270 | * Go through all remote ports. If they were found in the latest |
271 | * discovery, reverify or log them in. Otherwise, log them out. | |
0f6c6149 JE |
272 | * Skip ports which were never discovered. These are the dNS port |
273 | * and ports which were created by PLOGI. | |
fa519f70 HR |
274 | * |
275 | * We don't need to use the _rcu variant here as the rport list | |
276 | * is protected by the disc mutex which is already held on entry. | |
0f6c6149 | 277 | */ |
fa519f70 | 278 | list_for_each_entry(rdata, &disc->rports, peers) { |
a407c593 | 279 | if (!kref_get_unless_zero(&rdata->kref)) |
0f6c6149 | 280 | continue; |
a407c593 HR |
281 | if (rdata->disc_id) { |
282 | if (rdata->disc_id == disc->disc_id) | |
05d7d3b0 | 283 | fc_rport_login(rdata); |
a407c593 | 284 | else |
c96c792a | 285 | fc_rport_logoff(rdata); |
a407c593 | 286 | } |
944ef968 | 287 | kref_put(&rdata->kref, fc_rport_destroy); |
0f6c6149 | 288 | } |
0d228c0f AJ |
289 | mutex_unlock(&disc->disc_mutex); |
290 | disc->disc_callback(lport, event); | |
291 | mutex_lock(&disc->disc_mutex); | |
42e9a92f RL |
292 | } |
293 | ||
294 | /** | |
34f42a07 | 295 | * fc_disc_error() - Handle error on dNS request |
3a3b42bf RL |
296 | * @disc: The discovery context |
297 | * @fp: The error code encoded as a frame pointer | |
42e9a92f RL |
298 | */ |
299 | static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp) | |
300 | { | |
0685230c | 301 | struct fc_lport *lport = fc_disc_lport(disc); |
42e9a92f | 302 | unsigned long delay = 0; |
7414705e RL |
303 | |
304 | FC_DISC_DBG(disc, "Error %ld, retries %d/%d\n", | |
305 | PTR_ERR(fp), disc->retry_count, | |
306 | FC_DISC_RETRY_LIMIT); | |
42e9a92f RL |
307 | |
308 | if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { | |
309 | /* | |
310 | * Memory allocation failure, or the exchange timed out, | |
311 | * retry after delay. | |
312 | */ | |
313 | if (disc->retry_count < FC_DISC_RETRY_LIMIT) { | |
314 | /* go ahead and retry */ | |
315 | if (!fp) | |
316 | delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY); | |
317 | else { | |
318 | delay = msecs_to_jiffies(lport->e_d_tov); | |
319 | ||
320 | /* timeout faster first time */ | |
321 | if (!disc->retry_count) | |
322 | delay /= 4; | |
323 | } | |
324 | disc->retry_count++; | |
325 | schedule_delayed_work(&disc->disc_work, delay); | |
786681b9 JE |
326 | } else |
327 | fc_disc_done(disc, DISC_EV_FAILED); | |
00832084 BPG |
328 | } else if (PTR_ERR(fp) == -FC_EX_CLOSED) { |
329 | /* | |
330 | * if discovery fails due to lport reset, clear | |
331 | * pending flag so that subsequent discovery can | |
332 | * continue | |
333 | */ | |
334 | disc->pending = 0; | |
42e9a92f RL |
335 | } |
336 | } | |
337 | ||
338 | /** | |
34f42a07 | 339 | * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request |
3a3b42bf | 340 | * @lport: The discovery context |
42e9a92f RL |
341 | */ |
342 | static void fc_disc_gpn_ft_req(struct fc_disc *disc) | |
343 | { | |
344 | struct fc_frame *fp; | |
0685230c | 345 | struct fc_lport *lport = fc_disc_lport(disc); |
42e9a92f | 346 | |
ee35624e HR |
347 | lockdep_assert_held(&disc->disc_mutex); |
348 | ||
42e9a92f RL |
349 | WARN_ON(!fc_lport_test_ready(lport)); |
350 | ||
351 | disc->pending = 1; | |
352 | disc->requested = 0; | |
353 | ||
354 | disc->buf_len = 0; | |
355 | disc->seq_count = 0; | |
356 | fp = fc_frame_alloc(lport, | |
357 | sizeof(struct fc_ct_hdr) + | |
358 | sizeof(struct fc_ns_gid_ft)); | |
359 | if (!fp) | |
360 | goto err; | |
361 | ||
a46f327a | 362 | if (lport->tt.elsct_send(lport, 0, fp, |
42e9a92f RL |
363 | FC_NS_GPN_FT, |
364 | fc_disc_gpn_ft_resp, | |
b94f8951 | 365 | disc, 3 * lport->r_a_tov)) |
42e9a92f RL |
366 | return; |
367 | err: | |
8f550f93 | 368 | fc_disc_error(disc, NULL); |
42e9a92f RL |
369 | } |
370 | ||
371 | /** | |
786681b9 | 372 | * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response. |
3a3b42bf RL |
373 | * @lport: The local port the GPN_FT was received on |
374 | * @buf: The GPN_FT response buffer | |
375 | * @len: The size of response buffer | |
786681b9 JE |
376 | * |
377 | * Goes through the list of IDs and names resulting from a request. | |
42e9a92f RL |
378 | */ |
379 | static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len) | |
380 | { | |
381 | struct fc_lport *lport; | |
382 | struct fc_gpn_ft_resp *np; | |
383 | char *bp; | |
384 | size_t plen; | |
385 | size_t tlen; | |
386 | int error = 0; | |
795d86f5 | 387 | struct fc_rport_identifiers ids; |
ab28f1fd | 388 | struct fc_rport_priv *rdata; |
42e9a92f | 389 | |
0685230c | 390 | lport = fc_disc_lport(disc); |
a1c1e4e7 | 391 | disc->seq_count++; |
42e9a92f RL |
392 | |
393 | /* | |
394 | * Handle partial name record left over from previous call. | |
395 | */ | |
396 | bp = buf; | |
397 | plen = len; | |
398 | np = (struct fc_gpn_ft_resp *)bp; | |
399 | tlen = disc->buf_len; | |
81a67b97 | 400 | disc->buf_len = 0; |
42e9a92f RL |
401 | if (tlen) { |
402 | WARN_ON(tlen >= sizeof(*np)); | |
403 | plen = sizeof(*np) - tlen; | |
404 | WARN_ON(plen <= 0); | |
405 | WARN_ON(plen >= sizeof(*np)); | |
406 | if (plen > len) | |
407 | plen = len; | |
408 | np = &disc->partial_buf; | |
409 | memcpy((char *)np + tlen, bp, plen); | |
410 | ||
411 | /* | |
412 | * Set bp so that the loop below will advance it to the | |
413 | * first valid full name element. | |
414 | */ | |
415 | bp -= tlen; | |
416 | len += tlen; | |
417 | plen += tlen; | |
418 | disc->buf_len = (unsigned char) plen; | |
419 | if (plen == sizeof(*np)) | |
420 | disc->buf_len = 0; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Handle full name records, including the one filled from above. | |
425 | * Normally, np == bp and plen == len, but from the partial case above, | |
426 | * bp, len describe the overall buffer, and np, plen describe the | |
427 | * partial buffer, which if would usually be full now. | |
428 | * After the first time through the loop, things return to "normal". | |
429 | */ | |
430 | while (plen >= sizeof(*np)) { | |
795d86f5 JE |
431 | ids.port_id = ntoh24(np->fp_fid); |
432 | ids.port_name = ntohll(np->fp_wwpn); | |
795d86f5 | 433 | |
7b2787ec | 434 | if (ids.port_id != lport->port_id && |
795d86f5 | 435 | ids.port_name != lport->wwpn) { |
2580064b | 436 | rdata = fc_rport_create(lport, ids.port_id); |
9737e6a7 RL |
437 | if (rdata) { |
438 | rdata->ids.port_name = ids.port_name; | |
0f6c6149 | 439 | rdata->disc_id = disc->disc_id; |
9737e6a7 | 440 | } else { |
7414705e RL |
441 | printk(KERN_WARNING "libfc: Failed to allocate " |
442 | "memory for the newly discovered port " | |
ce8b5df0 | 443 | "(%6.6x)\n", ids.port_id); |
81a67b97 JE |
444 | error = -ENOMEM; |
445 | } | |
42e9a92f RL |
446 | } |
447 | ||
448 | if (np->fp_flags & FC_NS_FID_LAST) { | |
786681b9 | 449 | fc_disc_done(disc, DISC_EV_SUCCESS); |
42e9a92f RL |
450 | len = 0; |
451 | break; | |
452 | } | |
453 | len -= sizeof(*np); | |
454 | bp += sizeof(*np); | |
455 | np = (struct fc_gpn_ft_resp *)bp; | |
456 | plen = len; | |
457 | } | |
458 | ||
459 | /* | |
460 | * Save any partial record at the end of the buffer for next time. | |
461 | */ | |
462 | if (error == 0 && len > 0 && len < sizeof(*np)) { | |
463 | if (np != &disc->partial_buf) { | |
7414705e RL |
464 | FC_DISC_DBG(disc, "Partial buffer remains " |
465 | "for discovery\n"); | |
42e9a92f RL |
466 | memcpy(&disc->partial_buf, np, len); |
467 | } | |
468 | disc->buf_len = (unsigned char) len; | |
42e9a92f RL |
469 | } |
470 | return error; | |
471 | } | |
472 | ||
34f42a07 | 473 | /** |
3a3b42bf RL |
474 | * fc_disc_timeout() - Handler for discovery timeouts |
475 | * @work: Structure holding discovery context that needs to retry discovery | |
42e9a92f RL |
476 | */ |
477 | static void fc_disc_timeout(struct work_struct *work) | |
478 | { | |
479 | struct fc_disc *disc = container_of(work, | |
480 | struct fc_disc, | |
481 | disc_work.work); | |
482 | mutex_lock(&disc->disc_mutex); | |
3667d7e7 | 483 | fc_disc_gpn_ft_req(disc); |
42e9a92f RL |
484 | mutex_unlock(&disc->disc_mutex); |
485 | } | |
486 | ||
487 | /** | |
34f42a07 | 488 | * fc_disc_gpn_ft_resp() - Handle a response frame from Get Port Names (GPN_FT) |
3a3b42bf RL |
489 | * @sp: The sequence that the GPN_FT response was received on |
490 | * @fp: The GPN_FT response frame | |
491 | * @lp_arg: The discovery context | |
42e9a92f | 492 | * |
0d228c0f AJ |
493 | * Locking Note: This function is called without disc mutex held, and |
494 | * should do all its processing with the mutex held | |
42e9a92f RL |
495 | */ |
496 | static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp, | |
497 | void *disc_arg) | |
498 | { | |
499 | struct fc_disc *disc = disc_arg; | |
500 | struct fc_ct_hdr *cp; | |
501 | struct fc_frame_header *fh; | |
a1c1e4e7 | 502 | enum fc_disc_event event = DISC_EV_NONE; |
42e9a92f | 503 | unsigned int seq_cnt; |
42e9a92f | 504 | unsigned int len; |
a1c1e4e7 | 505 | int error = 0; |
42e9a92f | 506 | |
0d228c0f | 507 | mutex_lock(&disc->disc_mutex); |
7414705e | 508 | FC_DISC_DBG(disc, "Received a GPN_FT response\n"); |
42e9a92f RL |
509 | |
510 | if (IS_ERR(fp)) { | |
511 | fc_disc_error(disc, fp); | |
0d228c0f | 512 | mutex_unlock(&disc->disc_mutex); |
42e9a92f RL |
513 | return; |
514 | } | |
515 | ||
516 | WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */ | |
517 | fh = fc_frame_header_get(fp); | |
518 | len = fr_len(fp) - sizeof(*fh); | |
519 | seq_cnt = ntohs(fh->fh_seq_cnt); | |
a1c1e4e7 | 520 | if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) { |
42e9a92f RL |
521 | cp = fc_frame_payload_get(fp, sizeof(*cp)); |
522 | if (!cp) { | |
7414705e RL |
523 | FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n", |
524 | fr_len(fp)); | |
883a337c | 525 | event = DISC_EV_FAILED; |
42e9a92f RL |
526 | } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) { |
527 | ||
34f42a07 | 528 | /* Accepted, parse the response. */ |
42e9a92f | 529 | len -= sizeof(*cp); |
a1c1e4e7 | 530 | error = fc_disc_gpn_ft_parse(disc, cp + 1, len); |
42e9a92f | 531 | } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { |
7414705e RL |
532 | FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x " |
533 | "(check zoning)\n", cp->ct_reason, | |
534 | cp->ct_explan); | |
a1c1e4e7 | 535 | event = DISC_EV_FAILED; |
c762608b JE |
536 | if (cp->ct_reason == FC_FS_RJT_UNABL && |
537 | cp->ct_explan == FC_FS_EXP_FTNR) | |
538 | event = DISC_EV_SUCCESS; | |
42e9a92f | 539 | } else { |
7414705e RL |
540 | FC_DISC_DBG(disc, "GPN_FT unexpected response code " |
541 | "%x\n", ntohs(cp->ct_cmd)); | |
883a337c | 542 | event = DISC_EV_FAILED; |
42e9a92f | 543 | } |
a1c1e4e7 JE |
544 | } else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) { |
545 | error = fc_disc_gpn_ft_parse(disc, fh + 1, len); | |
42e9a92f | 546 | } else { |
7414705e RL |
547 | FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? " |
548 | "seq_cnt %x expected %x sof %x eof %x\n", | |
549 | seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp)); | |
883a337c | 550 | event = DISC_EV_FAILED; |
42e9a92f | 551 | } |
a1c1e4e7 | 552 | if (error) |
6f37e210 | 553 | fc_disc_error(disc, ERR_PTR(error)); |
a1c1e4e7 JE |
554 | else if (event != DISC_EV_NONE) |
555 | fc_disc_done(disc, event); | |
42e9a92f | 556 | fc_frame_free(fp); |
0d228c0f | 557 | mutex_unlock(&disc->disc_mutex); |
42e9a92f RL |
558 | } |
559 | ||
560 | /** | |
2ab7e1ec | 561 | * fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID) |
3a3b42bf RL |
562 | * @sp: The sequence the GPN_ID is on |
563 | * @fp: The response frame | |
564 | * @rdata_arg: The remote port that sent the GPN_ID response | |
42e9a92f | 565 | * |
2ab7e1ec | 566 | * Locking Note: This function is called without disc mutex held. |
42e9a92f | 567 | */ |
2ab7e1ec JE |
568 | static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, |
569 | void *rdata_arg) | |
42e9a92f | 570 | { |
2ab7e1ec JE |
571 | struct fc_rport_priv *rdata = rdata_arg; |
572 | struct fc_rport_priv *new_rdata; | |
42e9a92f | 573 | struct fc_lport *lport; |
2ab7e1ec JE |
574 | struct fc_disc *disc; |
575 | struct fc_ct_hdr *cp; | |
576 | struct fc_ns_gid_pn *pn; | |
577 | u64 port_name; | |
42e9a92f | 578 | |
2ab7e1ec JE |
579 | lport = rdata->local_port; |
580 | disc = &lport->disc; | |
42e9a92f | 581 | |
2ab7e1ec | 582 | if (PTR_ERR(fp) == -FC_EX_CLOSED) |
42e9a92f | 583 | goto out; |
2ab7e1ec JE |
584 | if (IS_ERR(fp)) |
585 | goto redisc; | |
586 | ||
587 | cp = fc_frame_payload_get(fp, sizeof(*cp)); | |
588 | if (!cp) | |
589 | goto redisc; | |
590 | if (ntohs(cp->ct_cmd) == FC_FS_ACC) { | |
591 | if (fr_len(fp) < sizeof(struct fc_frame_header) + | |
592 | sizeof(*cp) + sizeof(*pn)) | |
593 | goto redisc; | |
594 | pn = (struct fc_ns_gid_pn *)(cp + 1); | |
595 | port_name = get_unaligned_be64(&pn->fn_wwpn); | |
a407c593 | 596 | mutex_lock(&rdata->rp_mutex); |
2ab7e1ec JE |
597 | if (rdata->ids.port_name == -1) |
598 | rdata->ids.port_name = port_name; | |
599 | else if (rdata->ids.port_name != port_name) { | |
600 | FC_DISC_DBG(disc, "GPN_ID accepted. WWPN changed. " | |
9f8f3aa6 | 601 | "Port-id %6.6x wwpn %16.16llx\n", |
2ab7e1ec | 602 | rdata->ids.port_id, port_name); |
a407c593 | 603 | mutex_unlock(&rdata->rp_mutex); |
c96c792a | 604 | fc_rport_logoff(rdata); |
a407c593 | 605 | mutex_lock(&lport->disc.disc_mutex); |
2580064b | 606 | new_rdata = fc_rport_create(lport, rdata->ids.port_id); |
a407c593 | 607 | mutex_unlock(&lport->disc.disc_mutex); |
2ab7e1ec JE |
608 | if (new_rdata) { |
609 | new_rdata->disc_id = disc->disc_id; | |
05d7d3b0 | 610 | fc_rport_login(new_rdata); |
2ab7e1ec JE |
611 | } |
612 | goto out; | |
613 | } | |
0f6c6149 | 614 | rdata->disc_id = disc->disc_id; |
a407c593 | 615 | mutex_unlock(&rdata->rp_mutex); |
05d7d3b0 | 616 | fc_rport_login(rdata); |
2ab7e1ec JE |
617 | } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { |
618 | FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n", | |
619 | cp->ct_reason, cp->ct_explan); | |
c96c792a | 620 | fc_rport_logoff(rdata); |
2ab7e1ec JE |
621 | } else { |
622 | FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n", | |
623 | ntohs(cp->ct_cmd)); | |
624 | redisc: | |
a407c593 | 625 | mutex_lock(&disc->disc_mutex); |
2ab7e1ec | 626 | fc_disc_restart(disc); |
a407c593 | 627 | mutex_unlock(&disc->disc_mutex); |
42e9a92f | 628 | } |
42e9a92f | 629 | out: |
944ef968 | 630 | kref_put(&rdata->kref, fc_rport_destroy); |
2ab7e1ec JE |
631 | } |
632 | ||
633 | /** | |
634 | * fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request | |
3a3b42bf | 635 | * @lport: The local port to initiate discovery on |
2ab7e1ec JE |
636 | * @rdata: remote port private data |
637 | * | |
2ab7e1ec JE |
638 | * On failure, an error code is returned. |
639 | */ | |
640 | static int fc_disc_gpn_id_req(struct fc_lport *lport, | |
641 | struct fc_rport_priv *rdata) | |
642 | { | |
643 | struct fc_frame *fp; | |
644 | ||
ee35624e | 645 | lockdep_assert_held(&lport->disc.disc_mutex); |
2ab7e1ec JE |
646 | fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + |
647 | sizeof(struct fc_ns_fid)); | |
648 | if (!fp) | |
649 | return -ENOMEM; | |
650 | if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID, | |
b94f8951 JE |
651 | fc_disc_gpn_id_resp, rdata, |
652 | 3 * lport->r_a_tov)) | |
2ab7e1ec JE |
653 | return -ENOMEM; |
654 | kref_get(&rdata->kref); | |
655 | return 0; | |
656 | } | |
657 | ||
658 | /** | |
659 | * fc_disc_single() - Discover the directory information for a single target | |
3a3b42bf RL |
660 | * @lport: The local port the remote port is associated with |
661 | * @dp: The port to rediscover | |
2ab7e1ec JE |
662 | */ |
663 | static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp) | |
664 | { | |
665 | struct fc_rport_priv *rdata; | |
666 | ||
ee35624e HR |
667 | lockdep_assert_held(&lport->disc.disc_mutex); |
668 | ||
2580064b | 669 | rdata = fc_rport_create(lport, dp->port_id); |
2ab7e1ec JE |
670 | if (!rdata) |
671 | return -ENOMEM; | |
672 | rdata->disc_id = 0; | |
673 | return fc_disc_gpn_id_req(lport, rdata); | |
42e9a92f RL |
674 | } |
675 | ||
676 | /** | |
34f42a07 | 677 | * fc_disc_stop() - Stop discovery for a given lport |
3a3b42bf | 678 | * @lport: The local port that discovery should stop on |
42e9a92f | 679 | */ |
c6b21c93 | 680 | static void fc_disc_stop(struct fc_lport *lport) |
42e9a92f RL |
681 | { |
682 | struct fc_disc *disc = &lport->disc; | |
683 | ||
c531b9b4 | 684 | if (disc->pending) |
42e9a92f | 685 | cancel_delayed_work_sync(&disc->disc_work); |
bc3d12b7 | 686 | mutex_lock(&disc->disc_mutex); |
c531b9b4 | 687 | fc_disc_stop_rports(disc); |
bc3d12b7 | 688 | mutex_unlock(&disc->disc_mutex); |
42e9a92f RL |
689 | } |
690 | ||
691 | /** | |
34f42a07 | 692 | * fc_disc_stop_final() - Stop discovery for a given lport |
3a3b42bf | 693 | * @lport: The lport that discovery should stop on |
42e9a92f RL |
694 | * |
695 | * This function will block until discovery has been | |
696 | * completely stopped and all rports have been deleted. | |
697 | */ | |
c6b21c93 | 698 | static void fc_disc_stop_final(struct fc_lport *lport) |
42e9a92f RL |
699 | { |
700 | fc_disc_stop(lport); | |
5922a957 | 701 | fc_rport_flush_queue(); |
42e9a92f RL |
702 | } |
703 | ||
704 | /** | |
0807619d RL |
705 | * fc_disc_config() - Configure the discovery layer for a local port |
706 | * @lport: The local port that needs the discovery layer to be configured | |
8a9a7138 | 707 | * @priv: Private data structre for users of the discovery layer |
42e9a92f | 708 | */ |
0807619d | 709 | void fc_disc_config(struct fc_lport *lport, void *priv) |
42e9a92f | 710 | { |
bc2e1299 | 711 | struct fc_disc *disc; |
42e9a92f RL |
712 | |
713 | if (!lport->tt.disc_start) | |
714 | lport->tt.disc_start = fc_disc_start; | |
715 | ||
716 | if (!lport->tt.disc_stop) | |
717 | lport->tt.disc_stop = fc_disc_stop; | |
718 | ||
719 | if (!lport->tt.disc_stop_final) | |
720 | lport->tt.disc_stop_final = fc_disc_stop_final; | |
721 | ||
722 | if (!lport->tt.disc_recv_req) | |
723 | lport->tt.disc_recv_req = fc_disc_recv_req; | |
724 | ||
42e9a92f | 725 | disc = &lport->disc; |
42e9a92f | 726 | |
8a9a7138 | 727 | disc->priv = priv; |
0807619d RL |
728 | } |
729 | EXPORT_SYMBOL(fc_disc_config); | |
42e9a92f | 730 | |
0807619d RL |
731 | /** |
732 | * fc_disc_init() - Initialize the discovery layer for a local port | |
733 | * @lport: The local port that needs the discovery layer to be initialized | |
734 | */ | |
735 | void fc_disc_init(struct fc_lport *lport) | |
736 | { | |
737 | struct fc_disc *disc = &lport->disc; | |
738 | ||
739 | INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout); | |
740 | mutex_init(&disc->disc_mutex); | |
741 | INIT_LIST_HEAD(&disc->rports); | |
42e9a92f RL |
742 | } |
743 | EXPORT_SYMBOL(fc_disc_init); |