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CommitLineData
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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>
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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
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44#include "fc_libfc.h"
45
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46#define FC_DISC_RETRY_LIMIT 3 /* max retries */
47#define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */
48
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49static void fc_disc_gpn_ft_req(struct fc_disc *);
50static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *);
786681b9 51static void fc_disc_done(struct fc_disc *, enum fc_disc_event);
42e9a92f 52static void fc_disc_timeout(struct work_struct *);
2ab7e1ec 53static int fc_disc_single(struct fc_lport *, struct fc_disc_port *);
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54static void fc_disc_restart(struct fc_disc *);
55
42e9a92f 56/**
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57 * fc_disc_stop_rports() - Delete all the remote ports associated with the lport
58 * @disc: The discovery job to stop remote ports on
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59 *
60 * Locking Note: This function expects that the lport mutex is locked before
61 * calling it.
62 */
63void 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);
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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);
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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
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80 *
81 * Locking Note: This function expects that the disc_mutex is locked
82 * before it is called.
83 */
92261156 84static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp)
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85{
86 struct fc_lport *lport;
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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");
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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));
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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);
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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);
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148 redisc = 1;
149 break;
150 }
151 }
92261156 152 lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
2ab7e1ec
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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");
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168 fc_disc_restart(disc);
169 } else {
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170 FC_DISC_DBG(disc, "RSCN received: not rediscovering. "
171 "redisc %d state %d in_prog %d\n",
172 redisc, lport->state, disc->pending);
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173 }
174 fc_frame_free(fp);
175 return;
176reject:
7414705e 177 FC_DISC_DBG(disc, "Received a bad RSCN frame\n");
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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);
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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
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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 193static void fc_disc_recv_req(struct fc_lport *lport, struct fc_frame *fp)
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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);
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203 mutex_unlock(&disc->disc_mutex);
204 break;
205 default:
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206 FC_DISC_DBG(disc, "Received an unsupported request, "
207 "the opcode is (%x)\n", op);
83383dd1 208 fc_frame_free(fp);
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209 break;
210 }
211}
212
213/**
34f42a07 214 * fc_disc_restart() - Restart discovery
3a3b42bf 215 * @disc: The discovery object to be restarted
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216 *
217 * Locking Note: This function expects that the disc mutex
218 * is already locked.
219 */
220static void fc_disc_restart(struct fc_disc *disc)
221{
935d0fce
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222 if (!disc->disc_callback)
223 return;
224
7414705e 225 FC_DISC_DBG(disc, "Restarting discovery\n");
42e9a92f 226
42e9a92f 227 disc->requested = 1;
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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);
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239}
240
241/**
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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
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245 */
246static void fc_disc_start(void (*disc_callback)(struct fc_lport *,
247 enum fc_disc_event),
248 struct fc_lport *lport)
249{
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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);
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260 mutex_unlock(&disc->disc_mutex);
261}
262
42e9a92f 263/**
34f42a07 264 * fc_disc_done() - Discovery has been completed
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265 * @disc: The discovery context
266 * @event: The discovery completion status
786681b9 267 *
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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 272static 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
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279 disc->pending = 0;
280 if (disc->requested) {
281 fc_disc_restart(disc);
282 return;
283 }
284
285 /*
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286 * Go through all remote ports. If they were found in the latest
287 * discovery, reverify or log them in. Otherwise, log them out.
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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) {
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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 }
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299
300 mutex_unlock(&disc->disc_mutex);
301 disc->disc_callback(lport, event);
302 mutex_lock(&disc->disc_mutex);
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303}
304
305/**
34f42a07 306 * fc_disc_error() - Handle error on dNS request
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307 * @disc: The discovery context
308 * @fp: The error code encoded as a frame pointer
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309 */
310static 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;
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314
315 FC_DISC_DBG(disc, "Error %ld, retries %d/%d\n",
316 PTR_ERR(fp), disc->retry_count,
317 FC_DISC_RETRY_LIMIT);
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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);
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337 } else
338 fc_disc_done(disc, DISC_EV_FAILED);
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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
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345 *
346 * Locking Note: This function expects that the disc_mutex is locked
347 * before it is called.
348 */
349static 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);
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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,
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368 FC_NS_GPN_FT,
369 fc_disc_gpn_ft_resp,
b94f8951 370 disc, 3 * lport->r_a_tov))
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371 return;
372err:
8f550f93 373 fc_disc_error(disc, NULL);
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374}
375
376/**
786681b9 377 * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response.
3a3b42bf
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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
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381 *
382 * Goes through the list of IDs and names resulting from a request.
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383 */
384static 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++;
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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;
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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) {
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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 {
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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 }
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451 }
452
453 if (np->fp_flags & FC_NS_FID_LAST) {
786681b9 454 fc_disc_done(disc, DISC_EV_SUCCESS);
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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) {
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469 FC_DISC_DBG(disc, "Partial buffer remains "
470 "for discovery\n");
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471 memcpy(&disc->partial_buf, np, len);
472 }
473 disc->buf_len = (unsigned char) len;
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474 }
475 return error;
476}
477
34f42a07 478/**
3a3b42bf
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479 * fc_disc_timeout() - Handler for discovery timeouts
480 * @work: Structure holding discovery context that needs to retry discovery
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481 */
482static 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);
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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
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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 *
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498 * Locking Note: This function is called without disc mutex held, and
499 * should do all its processing with the mutex held
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500 */
501static 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");
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514
515 if (IS_ERR(fp)) {
516 fc_disc_error(disc, fp);
0d228c0f 517 mutex_unlock(&disc->disc_mutex);
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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) {
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526 cp = fc_frame_payload_get(fp, sizeof(*cp));
527 if (!cp) {
7414705e
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528 FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n",
529 fr_len(fp));
883a337c 530 event = DISC_EV_FAILED;
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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) {
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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 {
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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 {
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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
573static 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));
627redisc:
628 fc_disc_restart(disc);
42e9a92f 629 }
42e9a92f 630out:
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 */
644static 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 */
669static 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 */
684void 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 */
700void 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 */
710int 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}
735EXPORT_SYMBOL(fc_disc_init);