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42e9a92f RL |
1 | /* |
2 | * Copyright(c) 2007 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 | * PORT LOCKING NOTES | |
22 | * | |
23 | * These comments only apply to the 'port code' which consists of the lport, | |
24 | * disc and rport blocks. | |
25 | * | |
26 | * MOTIVATION | |
27 | * | |
28 | * The lport, disc and rport blocks all have mutexes that are used to protect | |
29 | * those objects. The main motivation for these locks is to prevent from | |
30 | * having an lport reset just before we send a frame. In that scenario the | |
31 | * lport's FID would get set to zero and then we'd send a frame with an | |
32 | * invalid SID. We also need to ensure that states don't change unexpectedly | |
33 | * while processing another state. | |
34 | * | |
35 | * HEIRARCHY | |
36 | * | |
37 | * The following heirarchy defines the locking rules. A greater lock | |
38 | * may be held before acquiring a lesser lock, but a lesser lock should never | |
39 | * be held while attempting to acquire a greater lock. Here is the heirarchy- | |
40 | * | |
41 | * lport > disc, lport > rport, disc > rport | |
42 | * | |
43 | * CALLBACKS | |
44 | * | |
45 | * The callbacks cause complications with this scheme. There is a callback | |
46 | * from the rport (to either lport or disc) and a callback from disc | |
47 | * (to the lport). | |
48 | * | |
49 | * As rports exit the rport state machine a callback is made to the owner of | |
50 | * the rport to notify success or failure. Since the callback is likely to | |
51 | * cause the lport or disc to grab its lock we cannot hold the rport lock | |
52 | * while making the callback. To ensure that the rport is not free'd while | |
53 | * processing the callback the rport callbacks are serialized through a | |
54 | * single-threaded workqueue. An rport would never be free'd while in a | |
55 | * callback handler becuase no other rport work in this queue can be executed | |
56 | * at the same time. | |
57 | * | |
58 | * When discovery succeeds or fails a callback is made to the lport as | |
59 | * notification. Currently, succesful discovery causes the lport to take no | |
60 | * action. A failure will cause the lport to reset. There is likely a circular | |
61 | * locking problem with this implementation. | |
62 | */ | |
63 | ||
64 | /* | |
65 | * LPORT LOCKING | |
66 | * | |
67 | * The critical sections protected by the lport's mutex are quite broad and | |
68 | * may be improved upon in the future. The lport code and its locking doesn't | |
69 | * influence the I/O path, so excessive locking doesn't penalize I/O | |
70 | * performance. | |
71 | * | |
72 | * The strategy is to lock whenever processing a request or response. Note | |
73 | * that every _enter_* function corresponds to a state change. They generally | |
74 | * change the lports state and then send a request out on the wire. We lock | |
75 | * before calling any of these functions to protect that state change. This | |
76 | * means that the entry points into the lport block manage the locks while | |
77 | * the state machine can transition between states (i.e. _enter_* functions) | |
78 | * while always staying protected. | |
79 | * | |
80 | * When handling responses we also hold the lport mutex broadly. When the | |
81 | * lport receives the response frame it locks the mutex and then calls the | |
82 | * appropriate handler for the particuar response. Generally a response will | |
83 | * trigger a state change and so the lock must already be held. | |
84 | * | |
85 | * Retries also have to consider the locking. The retries occur from a work | |
86 | * context and the work function will lock the lport and then retry the state | |
87 | * (i.e. _enter_* function). | |
88 | */ | |
89 | ||
90 | #include <linux/timer.h> | |
91 | #include <asm/unaligned.h> | |
92 | ||
93 | #include <scsi/fc/fc_gs.h> | |
94 | ||
95 | #include <scsi/libfc.h> | |
96 | #include <scsi/fc_encode.h> | |
97 | ||
98 | /* Fabric IDs to use for point-to-point mode, chosen on whims. */ | |
99 | #define FC_LOCAL_PTP_FID_LO 0x010101 | |
100 | #define FC_LOCAL_PTP_FID_HI 0x010102 | |
101 | ||
102 | #define DNS_DELAY 3 /* Discovery delay after RSCN (in seconds)*/ | |
103 | ||
104 | static int fc_lport_debug; | |
105 | ||
106 | #define FC_DEBUG_LPORT(fmt...) \ | |
107 | do { \ | |
108 | if (fc_lport_debug) \ | |
109 | FC_DBG(fmt); \ | |
110 | } while (0) | |
111 | ||
112 | static void fc_lport_error(struct fc_lport *, struct fc_frame *); | |
113 | ||
114 | static void fc_lport_enter_reset(struct fc_lport *); | |
115 | static void fc_lport_enter_flogi(struct fc_lport *); | |
116 | static void fc_lport_enter_dns(struct fc_lport *); | |
117 | static void fc_lport_enter_rpn_id(struct fc_lport *); | |
118 | static void fc_lport_enter_rft_id(struct fc_lport *); | |
119 | static void fc_lport_enter_scr(struct fc_lport *); | |
120 | static void fc_lport_enter_ready(struct fc_lport *); | |
121 | static void fc_lport_enter_logo(struct fc_lport *); | |
122 | ||
123 | static const char *fc_lport_state_names[] = { | |
124 | [LPORT_ST_NONE] = "none", | |
125 | [LPORT_ST_FLOGI] = "FLOGI", | |
126 | [LPORT_ST_DNS] = "dNS", | |
127 | [LPORT_ST_RPN_ID] = "RPN_ID", | |
128 | [LPORT_ST_RFT_ID] = "RFT_ID", | |
129 | [LPORT_ST_SCR] = "SCR", | |
130 | [LPORT_ST_READY] = "Ready", | |
131 | [LPORT_ST_LOGO] = "LOGO", | |
132 | [LPORT_ST_RESET] = "reset", | |
133 | }; | |
134 | ||
135 | static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp) | |
136 | { | |
137 | fc_frame_free(fp); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | /** | |
142 | * fc_lport_rport_callback - Event handler for rport events | |
143 | * @lport: The lport which is receiving the event | |
144 | * @rport: The rport which the event has occured on | |
145 | * @event: The event that occured | |
146 | * | |
147 | * Locking Note: The rport lock should not be held when calling | |
148 | * this function. | |
149 | */ | |
150 | static void fc_lport_rport_callback(struct fc_lport *lport, | |
151 | struct fc_rport *rport, | |
152 | enum fc_rport_event event) | |
153 | { | |
154 | FC_DEBUG_LPORT("Received a %d event for port (%6x)\n", event, | |
155 | rport->port_id); | |
156 | ||
157 | switch (event) { | |
158 | case RPORT_EV_CREATED: | |
159 | if (rport->port_id == FC_FID_DIR_SERV) { | |
160 | mutex_lock(&lport->lp_mutex); | |
161 | if (lport->state == LPORT_ST_DNS) { | |
162 | lport->dns_rp = rport; | |
163 | fc_lport_enter_rpn_id(lport); | |
164 | } else { | |
165 | FC_DEBUG_LPORT("Received an CREATED event on " | |
166 | "port (%6x) for the directory " | |
167 | "server, but the lport is not " | |
168 | "in the DNS state, it's in the " | |
169 | "%d state", rport->port_id, | |
170 | lport->state); | |
171 | lport->tt.rport_logoff(rport); | |
172 | } | |
173 | mutex_unlock(&lport->lp_mutex); | |
174 | } else | |
175 | FC_DEBUG_LPORT("Received an event for port (%6x) " | |
176 | "which is not the directory server\n", | |
177 | rport->port_id); | |
178 | break; | |
179 | case RPORT_EV_LOGO: | |
180 | case RPORT_EV_FAILED: | |
181 | case RPORT_EV_STOP: | |
182 | if (rport->port_id == FC_FID_DIR_SERV) { | |
183 | mutex_lock(&lport->lp_mutex); | |
184 | lport->dns_rp = NULL; | |
185 | mutex_unlock(&lport->lp_mutex); | |
186 | ||
187 | } else | |
188 | FC_DEBUG_LPORT("Received an event for port (%6x) " | |
189 | "which is not the directory server\n", | |
190 | rport->port_id); | |
191 | break; | |
192 | case RPORT_EV_NONE: | |
193 | break; | |
194 | } | |
195 | } | |
196 | ||
197 | /** | |
198 | * fc_lport_state - Return a string which represents the lport's state | |
199 | * @lport: The lport whose state is to converted to a string | |
200 | */ | |
201 | static const char *fc_lport_state(struct fc_lport *lport) | |
202 | { | |
203 | const char *cp; | |
204 | ||
205 | cp = fc_lport_state_names[lport->state]; | |
206 | if (!cp) | |
207 | cp = "unknown"; | |
208 | return cp; | |
209 | } | |
210 | ||
211 | /** | |
212 | * fc_lport_ptp_setup - Create an rport for point-to-point mode | |
213 | * @lport: The lport to attach the ptp rport to | |
214 | * @fid: The FID of the ptp rport | |
215 | * @remote_wwpn: The WWPN of the ptp rport | |
216 | * @remote_wwnn: The WWNN of the ptp rport | |
217 | */ | |
218 | static void fc_lport_ptp_setup(struct fc_lport *lport, | |
219 | u32 remote_fid, u64 remote_wwpn, | |
220 | u64 remote_wwnn) | |
221 | { | |
222 | struct fc_disc_port dp; | |
223 | ||
224 | dp.lp = lport; | |
225 | dp.ids.port_id = remote_fid; | |
226 | dp.ids.port_name = remote_wwpn; | |
227 | dp.ids.node_name = remote_wwnn; | |
228 | dp.ids.roles = FC_RPORT_ROLE_UNKNOWN; | |
229 | ||
230 | if (lport->ptp_rp) { | |
231 | lport->tt.rport_logoff(lport->ptp_rp); | |
232 | lport->ptp_rp = NULL; | |
233 | } | |
234 | ||
235 | lport->ptp_rp = fc_rport_rogue_create(&dp); | |
236 | ||
237 | lport->tt.rport_login(lport->ptp_rp); | |
238 | ||
239 | fc_lport_enter_ready(lport); | |
240 | } | |
241 | ||
242 | void fc_get_host_port_type(struct Scsi_Host *shost) | |
243 | { | |
244 | /* TODO - currently just NPORT */ | |
245 | fc_host_port_type(shost) = FC_PORTTYPE_NPORT; | |
246 | } | |
247 | EXPORT_SYMBOL(fc_get_host_port_type); | |
248 | ||
249 | void fc_get_host_port_state(struct Scsi_Host *shost) | |
250 | { | |
251 | struct fc_lport *lp = shost_priv(shost); | |
252 | ||
253 | if ((lp->link_status & FC_LINK_UP) == FC_LINK_UP) | |
254 | fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; | |
255 | else | |
256 | fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE; | |
257 | } | |
258 | EXPORT_SYMBOL(fc_get_host_port_state); | |
259 | ||
260 | void fc_get_host_speed(struct Scsi_Host *shost) | |
261 | { | |
262 | struct fc_lport *lport = shost_priv(shost); | |
263 | ||
264 | fc_host_speed(shost) = lport->link_speed; | |
265 | } | |
266 | EXPORT_SYMBOL(fc_get_host_speed); | |
267 | ||
268 | struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost) | |
269 | { | |
270 | int i; | |
271 | struct fc_host_statistics *fcoe_stats; | |
272 | struct fc_lport *lp = shost_priv(shost); | |
273 | struct timespec v0, v1; | |
274 | ||
275 | fcoe_stats = &lp->host_stats; | |
276 | memset(fcoe_stats, 0, sizeof(struct fc_host_statistics)); | |
277 | ||
278 | jiffies_to_timespec(jiffies, &v0); | |
279 | jiffies_to_timespec(lp->boot_time, &v1); | |
280 | fcoe_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec); | |
281 | ||
282 | for_each_online_cpu(i) { | |
283 | struct fcoe_dev_stats *stats = lp->dev_stats[i]; | |
284 | if (stats == NULL) | |
285 | continue; | |
286 | fcoe_stats->tx_frames += stats->TxFrames; | |
287 | fcoe_stats->tx_words += stats->TxWords; | |
288 | fcoe_stats->rx_frames += stats->RxFrames; | |
289 | fcoe_stats->rx_words += stats->RxWords; | |
290 | fcoe_stats->error_frames += stats->ErrorFrames; | |
291 | fcoe_stats->invalid_crc_count += stats->InvalidCRCCount; | |
292 | fcoe_stats->fcp_input_requests += stats->InputRequests; | |
293 | fcoe_stats->fcp_output_requests += stats->OutputRequests; | |
294 | fcoe_stats->fcp_control_requests += stats->ControlRequests; | |
295 | fcoe_stats->fcp_input_megabytes += stats->InputMegabytes; | |
296 | fcoe_stats->fcp_output_megabytes += stats->OutputMegabytes; | |
297 | fcoe_stats->link_failure_count += stats->LinkFailureCount; | |
298 | } | |
299 | fcoe_stats->lip_count = -1; | |
300 | fcoe_stats->nos_count = -1; | |
301 | fcoe_stats->loss_of_sync_count = -1; | |
302 | fcoe_stats->loss_of_signal_count = -1; | |
303 | fcoe_stats->prim_seq_protocol_err_count = -1; | |
304 | fcoe_stats->dumped_frames = -1; | |
305 | return fcoe_stats; | |
306 | } | |
307 | EXPORT_SYMBOL(fc_get_host_stats); | |
308 | ||
309 | /* | |
310 | * Fill in FLOGI command for request. | |
311 | */ | |
312 | static void | |
313 | fc_lport_flogi_fill(struct fc_lport *lport, struct fc_els_flogi *flogi, | |
314 | unsigned int op) | |
315 | { | |
316 | struct fc_els_csp *sp; | |
317 | struct fc_els_cssp *cp; | |
318 | ||
319 | memset(flogi, 0, sizeof(*flogi)); | |
320 | flogi->fl_cmd = (u8) op; | |
321 | put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn); | |
322 | put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn); | |
323 | sp = &flogi->fl_csp; | |
324 | sp->sp_hi_ver = 0x20; | |
325 | sp->sp_lo_ver = 0x20; | |
326 | sp->sp_bb_cred = htons(10); /* this gets set by gateway */ | |
327 | sp->sp_bb_data = htons((u16) lport->mfs); | |
328 | cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */ | |
329 | cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ); | |
330 | if (op != ELS_FLOGI) { | |
331 | sp->sp_features = htons(FC_SP_FT_CIRO); | |
332 | sp->sp_tot_seq = htons(255); /* seq. we accept */ | |
333 | sp->sp_rel_off = htons(0x1f); | |
334 | sp->sp_e_d_tov = htonl(lport->e_d_tov); | |
335 | ||
336 | cp->cp_rdfs = htons((u16) lport->mfs); | |
337 | cp->cp_con_seq = htons(255); | |
338 | cp->cp_open_seq = 1; | |
339 | } | |
340 | } | |
341 | ||
342 | /* | |
343 | * Add a supported FC-4 type. | |
344 | */ | |
345 | static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type) | |
346 | { | |
347 | __be32 *mp; | |
348 | ||
349 | mp = &lport->fcts.ff_type_map[type / FC_NS_BPW]; | |
350 | *mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW)); | |
351 | } | |
352 | ||
353 | /** | |
354 | * fc_lport_recv_rlir_req - Handle received Registered Link Incident Report. | |
355 | * @lport: Fibre Channel local port recieving the RLIR | |
356 | * @sp: current sequence in the RLIR exchange | |
357 | * @fp: RLIR request frame | |
358 | * | |
359 | * Locking Note: The lport lock is exected to be held before calling | |
360 | * this function. | |
361 | */ | |
362 | static void fc_lport_recv_rlir_req(struct fc_seq *sp, struct fc_frame *fp, | |
363 | struct fc_lport *lport) | |
364 | { | |
365 | FC_DEBUG_LPORT("Received RLIR request while in state %s\n", | |
366 | fc_lport_state(lport)); | |
367 | ||
368 | lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); | |
369 | fc_frame_free(fp); | |
370 | } | |
371 | ||
372 | /** | |
373 | * fc_lport_recv_echo_req - Handle received ECHO request | |
374 | * @lport: Fibre Channel local port recieving the ECHO | |
375 | * @sp: current sequence in the ECHO exchange | |
376 | * @fp: ECHO request frame | |
377 | * | |
378 | * Locking Note: The lport lock is exected to be held before calling | |
379 | * this function. | |
380 | */ | |
381 | static void fc_lport_recv_echo_req(struct fc_seq *sp, struct fc_frame *in_fp, | |
382 | struct fc_lport *lport) | |
383 | { | |
384 | struct fc_frame *fp; | |
385 | struct fc_exch *ep = fc_seq_exch(sp); | |
386 | unsigned int len; | |
387 | void *pp; | |
388 | void *dp; | |
389 | u32 f_ctl; | |
390 | ||
391 | FC_DEBUG_LPORT("Received RLIR request while in state %s\n", | |
392 | fc_lport_state(lport)); | |
393 | ||
394 | len = fr_len(in_fp) - sizeof(struct fc_frame_header); | |
395 | pp = fc_frame_payload_get(in_fp, len); | |
396 | ||
397 | if (len < sizeof(__be32)) | |
398 | len = sizeof(__be32); | |
399 | ||
400 | fp = fc_frame_alloc(lport, len); | |
401 | if (fp) { | |
402 | dp = fc_frame_payload_get(fp, len); | |
403 | memcpy(dp, pp, len); | |
404 | *((u32 *)dp) = htonl(ELS_LS_ACC << 24); | |
405 | sp = lport->tt.seq_start_next(sp); | |
406 | f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
407 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, | |
408 | FC_TYPE_ELS, f_ctl, 0); | |
409 | lport->tt.seq_send(lport, sp, fp); | |
410 | } | |
411 | fc_frame_free(in_fp); | |
412 | } | |
413 | ||
414 | /** | |
415 | * fc_lport_recv_echo_req - Handle received Request Node ID data request | |
416 | * @lport: Fibre Channel local port recieving the RNID | |
417 | * @sp: current sequence in the RNID exchange | |
418 | * @fp: RNID request frame | |
419 | * | |
420 | * Locking Note: The lport lock is exected to be held before calling | |
421 | * this function. | |
422 | */ | |
423 | static void fc_lport_recv_rnid_req(struct fc_seq *sp, struct fc_frame *in_fp, | |
424 | struct fc_lport *lport) | |
425 | { | |
426 | struct fc_frame *fp; | |
427 | struct fc_exch *ep = fc_seq_exch(sp); | |
428 | struct fc_els_rnid *req; | |
429 | struct { | |
430 | struct fc_els_rnid_resp rnid; | |
431 | struct fc_els_rnid_cid cid; | |
432 | struct fc_els_rnid_gen gen; | |
433 | } *rp; | |
434 | struct fc_seq_els_data rjt_data; | |
435 | u8 fmt; | |
436 | size_t len; | |
437 | u32 f_ctl; | |
438 | ||
439 | FC_DEBUG_LPORT("Received RNID request while in state %s\n", | |
440 | fc_lport_state(lport)); | |
441 | ||
442 | req = fc_frame_payload_get(in_fp, sizeof(*req)); | |
443 | if (!req) { | |
444 | rjt_data.fp = NULL; | |
445 | rjt_data.reason = ELS_RJT_LOGIC; | |
446 | rjt_data.explan = ELS_EXPL_NONE; | |
447 | lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); | |
448 | } else { | |
449 | fmt = req->rnid_fmt; | |
450 | len = sizeof(*rp); | |
451 | if (fmt != ELS_RNIDF_GEN || | |
452 | ntohl(lport->rnid_gen.rnid_atype) == 0) { | |
453 | fmt = ELS_RNIDF_NONE; /* nothing to provide */ | |
454 | len -= sizeof(rp->gen); | |
455 | } | |
456 | fp = fc_frame_alloc(lport, len); | |
457 | if (fp) { | |
458 | rp = fc_frame_payload_get(fp, len); | |
459 | memset(rp, 0, len); | |
460 | rp->rnid.rnid_cmd = ELS_LS_ACC; | |
461 | rp->rnid.rnid_fmt = fmt; | |
462 | rp->rnid.rnid_cid_len = sizeof(rp->cid); | |
463 | rp->cid.rnid_wwpn = htonll(lport->wwpn); | |
464 | rp->cid.rnid_wwnn = htonll(lport->wwnn); | |
465 | if (fmt == ELS_RNIDF_GEN) { | |
466 | rp->rnid.rnid_sid_len = sizeof(rp->gen); | |
467 | memcpy(&rp->gen, &lport->rnid_gen, | |
468 | sizeof(rp->gen)); | |
469 | } | |
470 | sp = lport->tt.seq_start_next(sp); | |
471 | f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ; | |
472 | f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
473 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, | |
474 | FC_TYPE_ELS, f_ctl, 0); | |
475 | lport->tt.seq_send(lport, sp, fp); | |
476 | } | |
477 | } | |
478 | fc_frame_free(in_fp); | |
479 | } | |
480 | ||
481 | /** | |
482 | * fc_lport_recv_adisc_req - Handle received Address Discovery Request | |
483 | * @lport: Fibre Channel local port recieving the ADISC | |
484 | * @sp: current sequence in the ADISC exchange | |
485 | * @fp: ADISC request frame | |
486 | * | |
487 | * Locking Note: The lport lock is expected to be held before calling | |
488 | * this function. | |
489 | */ | |
490 | static void fc_lport_recv_adisc_req(struct fc_seq *sp, struct fc_frame *in_fp, | |
491 | struct fc_lport *lport) | |
492 | { | |
493 | struct fc_frame *fp; | |
494 | struct fc_exch *ep = fc_seq_exch(sp); | |
495 | struct fc_els_adisc *req, *rp; | |
496 | struct fc_seq_els_data rjt_data; | |
497 | size_t len; | |
498 | u32 f_ctl; | |
499 | ||
500 | FC_DEBUG_LPORT("Received ADISC request while in state %s\n", | |
501 | fc_lport_state(lport)); | |
502 | ||
503 | req = fc_frame_payload_get(in_fp, sizeof(*req)); | |
504 | if (!req) { | |
505 | rjt_data.fp = NULL; | |
506 | rjt_data.reason = ELS_RJT_LOGIC; | |
507 | rjt_data.explan = ELS_EXPL_NONE; | |
508 | lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); | |
509 | } else { | |
510 | len = sizeof(*rp); | |
511 | fp = fc_frame_alloc(lport, len); | |
512 | if (fp) { | |
513 | rp = fc_frame_payload_get(fp, len); | |
514 | memset(rp, 0, len); | |
515 | rp->adisc_cmd = ELS_LS_ACC; | |
516 | rp->adisc_wwpn = htonll(lport->wwpn); | |
517 | rp->adisc_wwnn = htonll(lport->wwnn); | |
518 | hton24(rp->adisc_port_id, | |
519 | fc_host_port_id(lport->host)); | |
520 | sp = lport->tt.seq_start_next(sp); | |
521 | f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ; | |
522 | f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
523 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, | |
524 | FC_TYPE_ELS, f_ctl, 0); | |
525 | lport->tt.seq_send(lport, sp, fp); | |
526 | } | |
527 | } | |
528 | fc_frame_free(in_fp); | |
529 | } | |
530 | ||
531 | /** | |
532 | * fc_lport_recv_logo_req - Handle received fabric LOGO request | |
533 | * @lport: Fibre Channel local port recieving the LOGO | |
534 | * @sp: current sequence in the LOGO exchange | |
535 | * @fp: LOGO request frame | |
536 | * | |
537 | * Locking Note: The lport lock is exected to be held before calling | |
538 | * this function. | |
539 | */ | |
540 | static void fc_lport_recv_logo_req(struct fc_seq *sp, struct fc_frame *fp, | |
541 | struct fc_lport *lport) | |
542 | { | |
543 | lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); | |
544 | fc_lport_enter_reset(lport); | |
545 | fc_frame_free(fp); | |
546 | } | |
547 | ||
548 | /** | |
549 | * fc_fabric_login - Start the lport state machine | |
550 | * @lport: The lport that should log into the fabric | |
551 | * | |
552 | * Locking Note: This function should not be called | |
553 | * with the lport lock held. | |
554 | */ | |
555 | int fc_fabric_login(struct fc_lport *lport) | |
556 | { | |
557 | int rc = -1; | |
558 | ||
559 | mutex_lock(&lport->lp_mutex); | |
560 | if (lport->state == LPORT_ST_NONE) { | |
561 | fc_lport_enter_reset(lport); | |
562 | rc = 0; | |
563 | } | |
564 | mutex_unlock(&lport->lp_mutex); | |
565 | ||
566 | return rc; | |
567 | } | |
568 | EXPORT_SYMBOL(fc_fabric_login); | |
569 | ||
570 | /** | |
571 | * fc_linkup - Handler for transport linkup events | |
572 | * @lport: The lport whose link is up | |
573 | */ | |
574 | void fc_linkup(struct fc_lport *lport) | |
575 | { | |
576 | FC_DEBUG_LPORT("Link is up for port (%6x)\n", | |
577 | fc_host_port_id(lport->host)); | |
578 | ||
579 | mutex_lock(&lport->lp_mutex); | |
580 | if ((lport->link_status & FC_LINK_UP) != FC_LINK_UP) { | |
581 | lport->link_status |= FC_LINK_UP; | |
582 | ||
583 | if (lport->state == LPORT_ST_RESET) | |
584 | fc_lport_enter_flogi(lport); | |
585 | } | |
586 | mutex_unlock(&lport->lp_mutex); | |
587 | } | |
588 | EXPORT_SYMBOL(fc_linkup); | |
589 | ||
590 | /** | |
591 | * fc_linkdown - Handler for transport linkdown events | |
592 | * @lport: The lport whose link is down | |
593 | */ | |
594 | void fc_linkdown(struct fc_lport *lport) | |
595 | { | |
596 | mutex_lock(&lport->lp_mutex); | |
597 | FC_DEBUG_LPORT("Link is down for port (%6x)\n", | |
598 | fc_host_port_id(lport->host)); | |
599 | ||
600 | if ((lport->link_status & FC_LINK_UP) == FC_LINK_UP) { | |
601 | lport->link_status &= ~(FC_LINK_UP); | |
602 | fc_lport_enter_reset(lport); | |
603 | lport->tt.fcp_cleanup(lport); | |
604 | } | |
605 | mutex_unlock(&lport->lp_mutex); | |
606 | } | |
607 | EXPORT_SYMBOL(fc_linkdown); | |
608 | ||
609 | /** | |
610 | * fc_pause - Pause the flow of frames | |
611 | * @lport: The lport to be paused | |
612 | */ | |
613 | void fc_pause(struct fc_lport *lport) | |
614 | { | |
615 | mutex_lock(&lport->lp_mutex); | |
616 | lport->link_status |= FC_PAUSE; | |
617 | mutex_unlock(&lport->lp_mutex); | |
618 | } | |
619 | EXPORT_SYMBOL(fc_pause); | |
620 | ||
621 | /** | |
622 | * fc_unpause - Unpause the flow of frames | |
623 | * @lport: The lport to be unpaused | |
624 | */ | |
625 | void fc_unpause(struct fc_lport *lport) | |
626 | { | |
627 | mutex_lock(&lport->lp_mutex); | |
628 | lport->link_status &= ~(FC_PAUSE); | |
629 | mutex_unlock(&lport->lp_mutex); | |
630 | } | |
631 | EXPORT_SYMBOL(fc_unpause); | |
632 | ||
633 | /** | |
634 | * fc_fabric_logoff - Logout of the fabric | |
635 | * @lport: fc_lport pointer to logoff the fabric | |
636 | * | |
637 | * Return value: | |
638 | * 0 for success, -1 for failure | |
639 | **/ | |
640 | int fc_fabric_logoff(struct fc_lport *lport) | |
641 | { | |
642 | lport->tt.disc_stop_final(lport); | |
643 | mutex_lock(&lport->lp_mutex); | |
644 | fc_lport_enter_logo(lport); | |
645 | mutex_unlock(&lport->lp_mutex); | |
646 | return 0; | |
647 | } | |
648 | EXPORT_SYMBOL(fc_fabric_logoff); | |
649 | ||
650 | /** | |
651 | * fc_lport_destroy - unregister a fc_lport | |
652 | * @lport: fc_lport pointer to unregister | |
653 | * | |
654 | * Return value: | |
655 | * None | |
656 | * Note: | |
657 | * exit routine for fc_lport instance | |
658 | * clean-up all the allocated memory | |
659 | * and free up other system resources. | |
660 | * | |
661 | **/ | |
662 | int fc_lport_destroy(struct fc_lport *lport) | |
663 | { | |
664 | lport->tt.frame_send = fc_frame_drop; | |
665 | lport->tt.fcp_abort_io(lport); | |
666 | lport->tt.exch_mgr_reset(lport->emp, 0, 0); | |
667 | return 0; | |
668 | } | |
669 | EXPORT_SYMBOL(fc_lport_destroy); | |
670 | ||
671 | /** | |
672 | * fc_set_mfs - sets up the mfs for the corresponding fc_lport | |
673 | * @lport: fc_lport pointer to unregister | |
674 | * @mfs: the new mfs for fc_lport | |
675 | * | |
676 | * Set mfs for the given fc_lport to the new mfs. | |
677 | * | |
678 | * Return: 0 for success | |
679 | * | |
680 | **/ | |
681 | int fc_set_mfs(struct fc_lport *lport, u32 mfs) | |
682 | { | |
683 | unsigned int old_mfs; | |
684 | int rc = -EINVAL; | |
685 | ||
686 | mutex_lock(&lport->lp_mutex); | |
687 | ||
688 | old_mfs = lport->mfs; | |
689 | ||
690 | if (mfs >= FC_MIN_MAX_FRAME) { | |
691 | mfs &= ~3; | |
692 | if (mfs > FC_MAX_FRAME) | |
693 | mfs = FC_MAX_FRAME; | |
694 | mfs -= sizeof(struct fc_frame_header); | |
695 | lport->mfs = mfs; | |
696 | rc = 0; | |
697 | } | |
698 | ||
699 | if (!rc && mfs < old_mfs) | |
700 | fc_lport_enter_reset(lport); | |
701 | ||
702 | mutex_unlock(&lport->lp_mutex); | |
703 | ||
704 | return rc; | |
705 | } | |
706 | EXPORT_SYMBOL(fc_set_mfs); | |
707 | ||
708 | /** | |
709 | * fc_lport_disc_callback - Callback for discovery events | |
710 | * @lport: FC local port | |
711 | * @event: The discovery event | |
712 | */ | |
713 | void fc_lport_disc_callback(struct fc_lport *lport, enum fc_disc_event event) | |
714 | { | |
715 | switch (event) { | |
716 | case DISC_EV_SUCCESS: | |
717 | FC_DEBUG_LPORT("Got a SUCCESS event for port (%6x)\n", | |
718 | fc_host_port_id(lport->host)); | |
719 | break; | |
720 | case DISC_EV_FAILED: | |
721 | FC_DEBUG_LPORT("Got a FAILED event for port (%6x)\n", | |
722 | fc_host_port_id(lport->host)); | |
723 | mutex_lock(&lport->lp_mutex); | |
724 | fc_lport_enter_reset(lport); | |
725 | mutex_unlock(&lport->lp_mutex); | |
726 | break; | |
727 | case DISC_EV_NONE: | |
728 | WARN_ON(1); | |
729 | break; | |
730 | } | |
731 | } | |
732 | ||
733 | /** | |
734 | * fc_rport_enter_ready - Enter the ready state and start discovery | |
735 | * @lport: Fibre Channel local port that is ready | |
736 | * | |
737 | * Locking Note: The lport lock is expected to be held before calling | |
738 | * this routine. | |
739 | */ | |
740 | static void fc_lport_enter_ready(struct fc_lport *lport) | |
741 | { | |
742 | FC_DEBUG_LPORT("Port (%6x) entered Ready from state %s\n", | |
743 | fc_host_port_id(lport->host), fc_lport_state(lport)); | |
744 | ||
745 | fc_lport_state_enter(lport, LPORT_ST_READY); | |
746 | ||
747 | lport->tt.disc_start(fc_lport_disc_callback, lport); | |
748 | } | |
749 | ||
750 | /** | |
751 | * fc_lport_recv_flogi_req - Receive a FLOGI request | |
752 | * @sp_in: The sequence the FLOGI is on | |
753 | * @rx_fp: The frame the FLOGI is in | |
754 | * @lport: The lport that recieved the request | |
755 | * | |
756 | * A received FLOGI request indicates a point-to-point connection. | |
757 | * Accept it with the common service parameters indicating our N port. | |
758 | * Set up to do a PLOGI if we have the higher-number WWPN. | |
759 | * | |
760 | * Locking Note: The lport lock is exected to be held before calling | |
761 | * this function. | |
762 | */ | |
763 | static void fc_lport_recv_flogi_req(struct fc_seq *sp_in, | |
764 | struct fc_frame *rx_fp, | |
765 | struct fc_lport *lport) | |
766 | { | |
767 | struct fc_frame *fp; | |
768 | struct fc_frame_header *fh; | |
769 | struct fc_seq *sp; | |
770 | struct fc_exch *ep; | |
771 | struct fc_els_flogi *flp; | |
772 | struct fc_els_flogi *new_flp; | |
773 | u64 remote_wwpn; | |
774 | u32 remote_fid; | |
775 | u32 local_fid; | |
776 | u32 f_ctl; | |
777 | ||
778 | FC_DEBUG_LPORT("Received FLOGI request while in state %s\n", | |
779 | fc_lport_state(lport)); | |
780 | ||
781 | fh = fc_frame_header_get(rx_fp); | |
782 | remote_fid = ntoh24(fh->fh_s_id); | |
783 | flp = fc_frame_payload_get(rx_fp, sizeof(*flp)); | |
784 | if (!flp) | |
785 | goto out; | |
786 | remote_wwpn = get_unaligned_be64(&flp->fl_wwpn); | |
787 | if (remote_wwpn == lport->wwpn) { | |
788 | FC_DBG("FLOGI from port with same WWPN %llx " | |
789 | "possible configuration error\n", remote_wwpn); | |
790 | goto out; | |
791 | } | |
792 | FC_DBG("FLOGI from port WWPN %llx\n", remote_wwpn); | |
793 | ||
794 | /* | |
795 | * XXX what is the right thing to do for FIDs? | |
796 | * The originator might expect our S_ID to be 0xfffffe. | |
797 | * But if so, both of us could end up with the same FID. | |
798 | */ | |
799 | local_fid = FC_LOCAL_PTP_FID_LO; | |
800 | if (remote_wwpn < lport->wwpn) { | |
801 | local_fid = FC_LOCAL_PTP_FID_HI; | |
802 | if (!remote_fid || remote_fid == local_fid) | |
803 | remote_fid = FC_LOCAL_PTP_FID_LO; | |
804 | } else if (!remote_fid) { | |
805 | remote_fid = FC_LOCAL_PTP_FID_HI; | |
806 | } | |
807 | ||
808 | fc_host_port_id(lport->host) = local_fid; | |
809 | ||
810 | fp = fc_frame_alloc(lport, sizeof(*flp)); | |
811 | if (fp) { | |
812 | sp = lport->tt.seq_start_next(fr_seq(rx_fp)); | |
813 | new_flp = fc_frame_payload_get(fp, sizeof(*flp)); | |
814 | fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI); | |
815 | new_flp->fl_cmd = (u8) ELS_LS_ACC; | |
816 | ||
817 | /* | |
818 | * Send the response. If this fails, the originator should | |
819 | * repeat the sequence. | |
820 | */ | |
821 | f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
822 | ep = fc_seq_exch(sp); | |
823 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, | |
824 | FC_TYPE_ELS, f_ctl, 0); | |
825 | lport->tt.seq_send(lport, sp, fp); | |
826 | ||
827 | } else { | |
828 | fc_lport_error(lport, fp); | |
829 | } | |
830 | fc_lport_ptp_setup(lport, remote_fid, remote_wwpn, | |
831 | get_unaligned_be64(&flp->fl_wwnn)); | |
832 | ||
833 | lport->tt.disc_start(fc_lport_disc_callback, lport); | |
834 | ||
835 | out: | |
836 | sp = fr_seq(rx_fp); | |
837 | fc_frame_free(rx_fp); | |
838 | } | |
839 | ||
840 | /** | |
841 | * fc_lport_recv_req - The generic lport request handler | |
842 | * @lport: The lport that received the request | |
843 | * @sp: The sequence the request is on | |
844 | * @fp: The frame the request is in | |
845 | * | |
846 | * This function will see if the lport handles the request or | |
847 | * if an rport should handle the request. | |
848 | * | |
849 | * Locking Note: This function should not be called with the lport | |
850 | * lock held becuase it will grab the lock. | |
851 | */ | |
852 | static void fc_lport_recv_req(struct fc_lport *lport, struct fc_seq *sp, | |
853 | struct fc_frame *fp) | |
854 | { | |
855 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
856 | void (*recv) (struct fc_seq *, struct fc_frame *, struct fc_lport *); | |
857 | struct fc_rport *rport; | |
858 | u32 s_id; | |
859 | u32 d_id; | |
860 | struct fc_seq_els_data rjt_data; | |
861 | ||
862 | mutex_lock(&lport->lp_mutex); | |
863 | ||
864 | /* | |
865 | * Handle special ELS cases like FLOGI, LOGO, and | |
866 | * RSCN here. These don't require a session. | |
867 | * Even if we had a session, it might not be ready. | |
868 | */ | |
869 | if (fh->fh_type == FC_TYPE_ELS && fh->fh_r_ctl == FC_RCTL_ELS_REQ) { | |
870 | /* | |
871 | * Check opcode. | |
872 | */ | |
873 | recv = NULL; | |
874 | switch (fc_frame_payload_op(fp)) { | |
875 | case ELS_FLOGI: | |
876 | recv = fc_lport_recv_flogi_req; | |
877 | break; | |
878 | case ELS_LOGO: | |
879 | fh = fc_frame_header_get(fp); | |
880 | if (ntoh24(fh->fh_s_id) == FC_FID_FLOGI) | |
881 | recv = fc_lport_recv_logo_req; | |
882 | break; | |
883 | case ELS_RSCN: | |
884 | recv = lport->tt.disc_recv_req; | |
885 | break; | |
886 | case ELS_ECHO: | |
887 | recv = fc_lport_recv_echo_req; | |
888 | break; | |
889 | case ELS_RLIR: | |
890 | recv = fc_lport_recv_rlir_req; | |
891 | break; | |
892 | case ELS_RNID: | |
893 | recv = fc_lport_recv_rnid_req; | |
894 | break; | |
895 | case ELS_ADISC: | |
896 | recv = fc_lport_recv_adisc_req; | |
897 | break; | |
898 | } | |
899 | ||
900 | if (recv) | |
901 | recv(sp, fp, lport); | |
902 | else { | |
903 | /* | |
904 | * Find session. | |
905 | * If this is a new incoming PLOGI, we won't find it. | |
906 | */ | |
907 | s_id = ntoh24(fh->fh_s_id); | |
908 | d_id = ntoh24(fh->fh_d_id); | |
909 | ||
910 | rport = lport->tt.rport_lookup(lport, s_id); | |
911 | if (rport) | |
912 | lport->tt.rport_recv_req(sp, fp, rport); | |
913 | else { | |
914 | rjt_data.fp = NULL; | |
915 | rjt_data.reason = ELS_RJT_UNAB; | |
916 | rjt_data.explan = ELS_EXPL_NONE; | |
917 | lport->tt.seq_els_rsp_send(sp, | |
918 | ELS_LS_RJT, | |
919 | &rjt_data); | |
920 | fc_frame_free(fp); | |
921 | } | |
922 | } | |
923 | } else { | |
924 | FC_DBG("dropping invalid frame (eof %x)\n", fr_eof(fp)); | |
925 | fc_frame_free(fp); | |
926 | } | |
927 | mutex_unlock(&lport->lp_mutex); | |
928 | ||
929 | /* | |
930 | * The common exch_done for all request may not be good | |
931 | * if any request requires longer hold on exhange. XXX | |
932 | */ | |
933 | lport->tt.exch_done(sp); | |
934 | } | |
935 | ||
936 | /** | |
937 | * fc_lport_reset - Reset an lport | |
938 | * @lport: The lport which should be reset | |
939 | * | |
940 | * Locking Note: This functions should not be called with the | |
941 | * lport lock held. | |
942 | */ | |
943 | int fc_lport_reset(struct fc_lport *lport) | |
944 | { | |
945 | mutex_lock(&lport->lp_mutex); | |
946 | fc_lport_enter_reset(lport); | |
947 | mutex_unlock(&lport->lp_mutex); | |
948 | return 0; | |
949 | } | |
950 | EXPORT_SYMBOL(fc_lport_reset); | |
951 | ||
952 | /** | |
953 | * fc_rport_enter_reset - Reset the local port | |
954 | * @lport: Fibre Channel local port to be reset | |
955 | * | |
956 | * Locking Note: The lport lock is expected to be held before calling | |
957 | * this routine. | |
958 | */ | |
959 | static void fc_lport_enter_reset(struct fc_lport *lport) | |
960 | { | |
961 | FC_DEBUG_LPORT("Port (%6x) entered RESET state from %s state\n", | |
962 | fc_host_port_id(lport->host), fc_lport_state(lport)); | |
963 | ||
964 | fc_lport_state_enter(lport, LPORT_ST_RESET); | |
965 | ||
966 | if (lport->dns_rp) | |
967 | lport->tt.rport_logoff(lport->dns_rp); | |
968 | ||
969 | if (lport->ptp_rp) { | |
970 | lport->tt.rport_logoff(lport->ptp_rp); | |
971 | lport->ptp_rp = NULL; | |
972 | } | |
973 | ||
974 | lport->tt.disc_stop(lport); | |
975 | ||
976 | lport->tt.exch_mgr_reset(lport->emp, 0, 0); | |
977 | fc_host_fabric_name(lport->host) = 0; | |
978 | fc_host_port_id(lport->host) = 0; | |
979 | ||
980 | if ((lport->link_status & FC_LINK_UP) == FC_LINK_UP) | |
981 | fc_lport_enter_flogi(lport); | |
982 | } | |
983 | ||
984 | /** | |
985 | * fc_lport_error - Handler for any errors | |
986 | * @lport: The fc_lport object | |
987 | * @fp: The frame pointer | |
988 | * | |
989 | * If the error was caused by a resource allocation failure | |
990 | * then wait for half a second and retry, otherwise retry | |
991 | * after the e_d_tov time. | |
992 | */ | |
993 | static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp) | |
994 | { | |
995 | unsigned long delay = 0; | |
996 | FC_DEBUG_LPORT("Error %ld in state %s, retries %d\n", | |
997 | PTR_ERR(fp), fc_lport_state(lport), | |
998 | lport->retry_count); | |
999 | ||
1000 | if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { | |
1001 | /* | |
1002 | * Memory allocation failure, or the exchange timed out. | |
1003 | * Retry after delay | |
1004 | */ | |
1005 | if (lport->retry_count < lport->max_retry_count) { | |
1006 | lport->retry_count++; | |
1007 | if (!fp) | |
1008 | delay = msecs_to_jiffies(500); | |
1009 | else | |
1010 | delay = msecs_to_jiffies(lport->e_d_tov); | |
1011 | ||
1012 | schedule_delayed_work(&lport->retry_work, delay); | |
1013 | } else { | |
1014 | switch (lport->state) { | |
1015 | case LPORT_ST_NONE: | |
1016 | case LPORT_ST_READY: | |
1017 | case LPORT_ST_RESET: | |
1018 | case LPORT_ST_RPN_ID: | |
1019 | case LPORT_ST_RFT_ID: | |
1020 | case LPORT_ST_SCR: | |
1021 | case LPORT_ST_DNS: | |
1022 | case LPORT_ST_FLOGI: | |
1023 | case LPORT_ST_LOGO: | |
1024 | fc_lport_enter_reset(lport); | |
1025 | break; | |
1026 | } | |
1027 | } | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | /** | |
1032 | * fc_lport_rft_id_resp - Handle response to Register Fibre | |
1033 | * Channel Types by ID (RPN_ID) request | |
1034 | * @sp: current sequence in RPN_ID exchange | |
1035 | * @fp: response frame | |
1036 | * @lp_arg: Fibre Channel host port instance | |
1037 | * | |
1038 | * Locking Note: This function will be called without the lport lock | |
1039 | * held, but it will lock, call an _enter_* function or fc_lport_error | |
1040 | * and then unlock the lport. | |
1041 | */ | |
1042 | static void fc_lport_rft_id_resp(struct fc_seq *sp, struct fc_frame *fp, | |
1043 | void *lp_arg) | |
1044 | { | |
1045 | struct fc_lport *lport = lp_arg; | |
1046 | struct fc_frame_header *fh; | |
1047 | struct fc_ct_hdr *ct; | |
1048 | ||
1049 | if (fp == ERR_PTR(-FC_EX_CLOSED)) | |
1050 | return; | |
1051 | ||
1052 | mutex_lock(&lport->lp_mutex); | |
1053 | ||
1054 | FC_DEBUG_LPORT("Received a RFT_ID response\n"); | |
1055 | ||
1056 | if (lport->state != LPORT_ST_RFT_ID) { | |
1057 | FC_DBG("Received a RFT_ID response, but in state %s\n", | |
1058 | fc_lport_state(lport)); | |
1059 | goto out; | |
1060 | } | |
1061 | ||
1062 | if (IS_ERR(fp)) { | |
1063 | fc_lport_error(lport, fp); | |
1064 | goto err; | |
1065 | } | |
1066 | ||
1067 | fh = fc_frame_header_get(fp); | |
1068 | ct = fc_frame_payload_get(fp, sizeof(*ct)); | |
1069 | ||
1070 | if (fh && ct && fh->fh_type == FC_TYPE_CT && | |
1071 | ct->ct_fs_type == FC_FST_DIR && | |
1072 | ct->ct_fs_subtype == FC_NS_SUBTYPE && | |
1073 | ntohs(ct->ct_cmd) == FC_FS_ACC) | |
1074 | fc_lport_enter_scr(lport); | |
1075 | else | |
1076 | fc_lport_error(lport, fp); | |
1077 | out: | |
1078 | fc_frame_free(fp); | |
1079 | err: | |
1080 | mutex_unlock(&lport->lp_mutex); | |
1081 | } | |
1082 | ||
1083 | /** | |
1084 | * fc_lport_rpn_id_resp - Handle response to Register Port | |
1085 | * Name by ID (RPN_ID) request | |
1086 | * @sp: current sequence in RPN_ID exchange | |
1087 | * @fp: response frame | |
1088 | * @lp_arg: Fibre Channel host port instance | |
1089 | * | |
1090 | * Locking Note: This function will be called without the lport lock | |
1091 | * held, but it will lock, call an _enter_* function or fc_lport_error | |
1092 | * and then unlock the lport. | |
1093 | */ | |
1094 | static void fc_lport_rpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, | |
1095 | void *lp_arg) | |
1096 | { | |
1097 | struct fc_lport *lport = lp_arg; | |
1098 | struct fc_frame_header *fh; | |
1099 | struct fc_ct_hdr *ct; | |
1100 | ||
1101 | if (fp == ERR_PTR(-FC_EX_CLOSED)) | |
1102 | return; | |
1103 | ||
1104 | mutex_lock(&lport->lp_mutex); | |
1105 | ||
1106 | FC_DEBUG_LPORT("Received a RPN_ID response\n"); | |
1107 | ||
1108 | if (lport->state != LPORT_ST_RPN_ID) { | |
1109 | FC_DBG("Received a RPN_ID response, but in state %s\n", | |
1110 | fc_lport_state(lport)); | |
1111 | goto out; | |
1112 | } | |
1113 | ||
1114 | if (IS_ERR(fp)) { | |
1115 | fc_lport_error(lport, fp); | |
1116 | goto err; | |
1117 | } | |
1118 | ||
1119 | fh = fc_frame_header_get(fp); | |
1120 | ct = fc_frame_payload_get(fp, sizeof(*ct)); | |
1121 | if (fh && ct && fh->fh_type == FC_TYPE_CT && | |
1122 | ct->ct_fs_type == FC_FST_DIR && | |
1123 | ct->ct_fs_subtype == FC_NS_SUBTYPE && | |
1124 | ntohs(ct->ct_cmd) == FC_FS_ACC) | |
1125 | fc_lport_enter_rft_id(lport); | |
1126 | else | |
1127 | fc_lport_error(lport, fp); | |
1128 | ||
1129 | out: | |
1130 | fc_frame_free(fp); | |
1131 | err: | |
1132 | mutex_unlock(&lport->lp_mutex); | |
1133 | } | |
1134 | ||
1135 | /** | |
1136 | * fc_lport_scr_resp - Handle response to State Change Register (SCR) request | |
1137 | * @sp: current sequence in SCR exchange | |
1138 | * @fp: response frame | |
1139 | * @lp_arg: Fibre Channel lport port instance that sent the registration request | |
1140 | * | |
1141 | * Locking Note: This function will be called without the lport lock | |
1142 | * held, but it will lock, call an _enter_* function or fc_lport_error | |
1143 | * and then unlock the lport. | |
1144 | */ | |
1145 | static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp, | |
1146 | void *lp_arg) | |
1147 | { | |
1148 | struct fc_lport *lport = lp_arg; | |
1149 | u8 op; | |
1150 | ||
1151 | if (fp == ERR_PTR(-FC_EX_CLOSED)) | |
1152 | return; | |
1153 | ||
1154 | mutex_lock(&lport->lp_mutex); | |
1155 | ||
1156 | FC_DEBUG_LPORT("Received a SCR response\n"); | |
1157 | ||
1158 | if (lport->state != LPORT_ST_SCR) { | |
1159 | FC_DBG("Received a SCR response, but in state %s\n", | |
1160 | fc_lport_state(lport)); | |
1161 | goto out; | |
1162 | } | |
1163 | ||
1164 | if (IS_ERR(fp)) { | |
1165 | fc_lport_error(lport, fp); | |
1166 | goto err; | |
1167 | } | |
1168 | ||
1169 | op = fc_frame_payload_op(fp); | |
1170 | if (op == ELS_LS_ACC) | |
1171 | fc_lport_enter_ready(lport); | |
1172 | else | |
1173 | fc_lport_error(lport, fp); | |
1174 | ||
1175 | out: | |
1176 | fc_frame_free(fp); | |
1177 | err: | |
1178 | mutex_unlock(&lport->lp_mutex); | |
1179 | } | |
1180 | ||
1181 | /** | |
1182 | * fc_lport_enter_scr - Send a State Change Register (SCR) request | |
1183 | * @lport: Fibre Channel local port to register for state changes | |
1184 | * | |
1185 | * Locking Note: The lport lock is expected to be held before calling | |
1186 | * this routine. | |
1187 | */ | |
1188 | static void fc_lport_enter_scr(struct fc_lport *lport) | |
1189 | { | |
1190 | struct fc_frame *fp; | |
1191 | ||
1192 | FC_DEBUG_LPORT("Port (%6x) entered SCR state from %s state\n", | |
1193 | fc_host_port_id(lport->host), fc_lport_state(lport)); | |
1194 | ||
1195 | fc_lport_state_enter(lport, LPORT_ST_SCR); | |
1196 | ||
1197 | fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr)); | |
1198 | if (!fp) { | |
1199 | fc_lport_error(lport, fp); | |
1200 | return; | |
1201 | } | |
1202 | ||
1203 | if (!lport->tt.elsct_send(lport, NULL, fp, ELS_SCR, | |
1204 | fc_lport_scr_resp, lport, lport->e_d_tov)) | |
1205 | fc_lport_error(lport, fp); | |
1206 | } | |
1207 | ||
1208 | /** | |
1209 | * fc_lport_enter_rft_id - Register FC4-types with the name server | |
1210 | * @lport: Fibre Channel local port to register | |
1211 | * | |
1212 | * Locking Note: The lport lock is expected to be held before calling | |
1213 | * this routine. | |
1214 | */ | |
1215 | static void fc_lport_enter_rft_id(struct fc_lport *lport) | |
1216 | { | |
1217 | struct fc_frame *fp; | |
1218 | struct fc_ns_fts *lps; | |
1219 | int i; | |
1220 | ||
1221 | FC_DEBUG_LPORT("Port (%6x) entered RFT_ID state from %s state\n", | |
1222 | fc_host_port_id(lport->host), fc_lport_state(lport)); | |
1223 | ||
1224 | fc_lport_state_enter(lport, LPORT_ST_RFT_ID); | |
1225 | ||
1226 | lps = &lport->fcts; | |
1227 | i = sizeof(lps->ff_type_map) / sizeof(lps->ff_type_map[0]); | |
1228 | while (--i >= 0) | |
1229 | if (ntohl(lps->ff_type_map[i]) != 0) | |
1230 | break; | |
1231 | if (i < 0) { | |
1232 | /* nothing to register, move on to SCR */ | |
1233 | fc_lport_enter_scr(lport); | |
1234 | return; | |
1235 | } | |
1236 | ||
1237 | fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + | |
1238 | sizeof(struct fc_ns_rft)); | |
1239 | if (!fp) { | |
1240 | fc_lport_error(lport, fp); | |
1241 | return; | |
1242 | } | |
1243 | ||
1244 | if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RFT_ID, | |
1245 | fc_lport_rft_id_resp, | |
1246 | lport, lport->e_d_tov)) | |
1247 | fc_lport_error(lport, fp); | |
1248 | } | |
1249 | ||
1250 | /** | |
1251 | * fc_rport_enter_rft_id - Register port name with the name server | |
1252 | * @lport: Fibre Channel local port to register | |
1253 | * | |
1254 | * Locking Note: The lport lock is expected to be held before calling | |
1255 | * this routine. | |
1256 | */ | |
1257 | static void fc_lport_enter_rpn_id(struct fc_lport *lport) | |
1258 | { | |
1259 | struct fc_frame *fp; | |
1260 | ||
1261 | FC_DEBUG_LPORT("Port (%6x) entered RPN_ID state from %s state\n", | |
1262 | fc_host_port_id(lport->host), fc_lport_state(lport)); | |
1263 | ||
1264 | fc_lport_state_enter(lport, LPORT_ST_RPN_ID); | |
1265 | ||
1266 | fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + | |
1267 | sizeof(struct fc_ns_rn_id)); | |
1268 | if (!fp) { | |
1269 | fc_lport_error(lport, fp); | |
1270 | return; | |
1271 | } | |
1272 | ||
1273 | if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RPN_ID, | |
1274 | fc_lport_rpn_id_resp, | |
1275 | lport, lport->e_d_tov)) | |
1276 | fc_lport_error(lport, fp); | |
1277 | } | |
1278 | ||
1279 | static struct fc_rport_operations fc_lport_rport_ops = { | |
1280 | .event_callback = fc_lport_rport_callback, | |
1281 | }; | |
1282 | ||
1283 | /** | |
1284 | * fc_rport_enter_dns - Create a rport to the name server | |
1285 | * @lport: Fibre Channel local port requesting a rport for the name server | |
1286 | * | |
1287 | * Locking Note: The lport lock is expected to be held before calling | |
1288 | * this routine. | |
1289 | */ | |
1290 | static void fc_lport_enter_dns(struct fc_lport *lport) | |
1291 | { | |
1292 | struct fc_rport *rport; | |
1293 | struct fc_rport_libfc_priv *rdata; | |
1294 | struct fc_disc_port dp; | |
1295 | ||
1296 | dp.ids.port_id = FC_FID_DIR_SERV; | |
1297 | dp.ids.port_name = -1; | |
1298 | dp.ids.node_name = -1; | |
1299 | dp.ids.roles = FC_RPORT_ROLE_UNKNOWN; | |
1300 | dp.lp = lport; | |
1301 | ||
1302 | FC_DEBUG_LPORT("Port (%6x) entered DNS state from %s state\n", | |
1303 | fc_host_port_id(lport->host), fc_lport_state(lport)); | |
1304 | ||
1305 | fc_lport_state_enter(lport, LPORT_ST_DNS); | |
1306 | ||
1307 | rport = fc_rport_rogue_create(&dp); | |
1308 | if (!rport) | |
1309 | goto err; | |
1310 | ||
1311 | rdata = rport->dd_data; | |
1312 | rdata->ops = &fc_lport_rport_ops; | |
1313 | lport->tt.rport_login(rport); | |
1314 | return; | |
1315 | ||
1316 | err: | |
1317 | fc_lport_error(lport, NULL); | |
1318 | } | |
1319 | ||
1320 | /** | |
1321 | * fc_lport_timeout - Handler for the retry_work timer. | |
1322 | * @work: The work struct of the fc_lport | |
1323 | */ | |
1324 | static void fc_lport_timeout(struct work_struct *work) | |
1325 | { | |
1326 | struct fc_lport *lport = | |
1327 | container_of(work, struct fc_lport, | |
1328 | retry_work.work); | |
1329 | ||
1330 | mutex_lock(&lport->lp_mutex); | |
1331 | ||
1332 | switch (lport->state) { | |
1333 | case LPORT_ST_NONE: | |
1334 | case LPORT_ST_READY: | |
1335 | case LPORT_ST_RESET: | |
1336 | WARN_ON(1); | |
1337 | break; | |
1338 | case LPORT_ST_FLOGI: | |
1339 | fc_lport_enter_flogi(lport); | |
1340 | break; | |
1341 | case LPORT_ST_DNS: | |
1342 | fc_lport_enter_dns(lport); | |
1343 | break; | |
1344 | case LPORT_ST_RPN_ID: | |
1345 | fc_lport_enter_rpn_id(lport); | |
1346 | break; | |
1347 | case LPORT_ST_RFT_ID: | |
1348 | fc_lport_enter_rft_id(lport); | |
1349 | break; | |
1350 | case LPORT_ST_SCR: | |
1351 | fc_lport_enter_scr(lport); | |
1352 | break; | |
1353 | case LPORT_ST_LOGO: | |
1354 | fc_lport_enter_logo(lport); | |
1355 | break; | |
1356 | } | |
1357 | ||
1358 | mutex_unlock(&lport->lp_mutex); | |
1359 | } | |
1360 | ||
1361 | /** | |
1362 | * fc_lport_logo_resp - Handle response to LOGO request | |
1363 | * @sp: current sequence in LOGO exchange | |
1364 | * @fp: response frame | |
1365 | * @lp_arg: Fibre Channel lport port instance that sent the LOGO request | |
1366 | * | |
1367 | * Locking Note: This function will be called without the lport lock | |
1368 | * held, but it will lock, call an _enter_* function or fc_lport_error | |
1369 | * and then unlock the lport. | |
1370 | */ | |
1371 | static void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, | |
1372 | void *lp_arg) | |
1373 | { | |
1374 | struct fc_lport *lport = lp_arg; | |
1375 | u8 op; | |
1376 | ||
1377 | if (fp == ERR_PTR(-FC_EX_CLOSED)) | |
1378 | return; | |
1379 | ||
1380 | mutex_lock(&lport->lp_mutex); | |
1381 | ||
1382 | FC_DEBUG_LPORT("Received a LOGO response\n"); | |
1383 | ||
1384 | if (lport->state != LPORT_ST_LOGO) { | |
1385 | FC_DBG("Received a LOGO response, but in state %s\n", | |
1386 | fc_lport_state(lport)); | |
1387 | goto out; | |
1388 | } | |
1389 | ||
1390 | if (IS_ERR(fp)) { | |
1391 | fc_lport_error(lport, fp); | |
1392 | goto err; | |
1393 | } | |
1394 | ||
1395 | op = fc_frame_payload_op(fp); | |
1396 | if (op == ELS_LS_ACC) | |
1397 | fc_lport_enter_reset(lport); | |
1398 | else | |
1399 | fc_lport_error(lport, fp); | |
1400 | ||
1401 | out: | |
1402 | fc_frame_free(fp); | |
1403 | err: | |
1404 | mutex_unlock(&lport->lp_mutex); | |
1405 | } | |
1406 | ||
1407 | /** | |
1408 | * fc_rport_enter_logo - Logout of the fabric | |
1409 | * @lport: Fibre Channel local port to be logged out | |
1410 | * | |
1411 | * Locking Note: The lport lock is expected to be held before calling | |
1412 | * this routine. | |
1413 | */ | |
1414 | static void fc_lport_enter_logo(struct fc_lport *lport) | |
1415 | { | |
1416 | struct fc_frame *fp; | |
1417 | struct fc_els_logo *logo; | |
1418 | ||
1419 | FC_DEBUG_LPORT("Port (%6x) entered LOGO state from %s state\n", | |
1420 | fc_host_port_id(lport->host), fc_lport_state(lport)); | |
1421 | ||
1422 | fc_lport_state_enter(lport, LPORT_ST_LOGO); | |
1423 | ||
1424 | /* DNS session should be closed so we can release it here */ | |
1425 | if (lport->dns_rp) | |
1426 | lport->tt.rport_logoff(lport->dns_rp); | |
1427 | ||
1428 | fp = fc_frame_alloc(lport, sizeof(*logo)); | |
1429 | if (!fp) { | |
1430 | fc_lport_error(lport, fp); | |
1431 | return; | |
1432 | } | |
1433 | ||
1434 | if (!lport->tt.elsct_send(lport, NULL, fp, ELS_LOGO, fc_lport_logo_resp, | |
1435 | lport, lport->e_d_tov)) | |
1436 | fc_lport_error(lport, fp); | |
1437 | } | |
1438 | ||
1439 | /** | |
1440 | * fc_lport_flogi_resp - Handle response to FLOGI request | |
1441 | * @sp: current sequence in FLOGI exchange | |
1442 | * @fp: response frame | |
1443 | * @lp_arg: Fibre Channel lport port instance that sent the FLOGI request | |
1444 | * | |
1445 | * Locking Note: This function will be called without the lport lock | |
1446 | * held, but it will lock, call an _enter_* function or fc_lport_error | |
1447 | * and then unlock the lport. | |
1448 | */ | |
1449 | static void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, | |
1450 | void *lp_arg) | |
1451 | { | |
1452 | struct fc_lport *lport = lp_arg; | |
1453 | struct fc_frame_header *fh; | |
1454 | struct fc_els_flogi *flp; | |
1455 | u32 did; | |
1456 | u16 csp_flags; | |
1457 | unsigned int r_a_tov; | |
1458 | unsigned int e_d_tov; | |
1459 | u16 mfs; | |
1460 | ||
1461 | if (fp == ERR_PTR(-FC_EX_CLOSED)) | |
1462 | return; | |
1463 | ||
1464 | mutex_lock(&lport->lp_mutex); | |
1465 | ||
1466 | FC_DEBUG_LPORT("Received a FLOGI response\n"); | |
1467 | ||
1468 | if (lport->state != LPORT_ST_FLOGI) { | |
1469 | FC_DBG("Received a FLOGI response, but in state %s\n", | |
1470 | fc_lport_state(lport)); | |
1471 | goto out; | |
1472 | } | |
1473 | ||
1474 | if (IS_ERR(fp)) { | |
1475 | fc_lport_error(lport, fp); | |
1476 | goto err; | |
1477 | } | |
1478 | ||
1479 | fh = fc_frame_header_get(fp); | |
1480 | did = ntoh24(fh->fh_d_id); | |
1481 | if (fc_frame_payload_op(fp) == ELS_LS_ACC && did != 0) { | |
1482 | ||
1483 | FC_DEBUG_LPORT("Assigned fid %x\n", did); | |
1484 | fc_host_port_id(lport->host) = did; | |
1485 | ||
1486 | flp = fc_frame_payload_get(fp, sizeof(*flp)); | |
1487 | if (flp) { | |
1488 | mfs = ntohs(flp->fl_csp.sp_bb_data) & | |
1489 | FC_SP_BB_DATA_MASK; | |
1490 | if (mfs >= FC_SP_MIN_MAX_PAYLOAD && | |
1491 | mfs < lport->mfs) | |
1492 | lport->mfs = mfs; | |
1493 | csp_flags = ntohs(flp->fl_csp.sp_features); | |
1494 | r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov); | |
1495 | e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov); | |
1496 | if (csp_flags & FC_SP_FT_EDTR) | |
1497 | e_d_tov /= 1000000; | |
1498 | if ((csp_flags & FC_SP_FT_FPORT) == 0) { | |
1499 | if (e_d_tov > lport->e_d_tov) | |
1500 | lport->e_d_tov = e_d_tov; | |
1501 | lport->r_a_tov = 2 * e_d_tov; | |
1502 | FC_DBG("Point-to-Point mode\n"); | |
1503 | fc_lport_ptp_setup(lport, ntoh24(fh->fh_s_id), | |
1504 | get_unaligned_be64( | |
1505 | &flp->fl_wwpn), | |
1506 | get_unaligned_be64( | |
1507 | &flp->fl_wwnn)); | |
1508 | } else { | |
1509 | lport->e_d_tov = e_d_tov; | |
1510 | lport->r_a_tov = r_a_tov; | |
1511 | fc_host_fabric_name(lport->host) = | |
1512 | get_unaligned_be64(&flp->fl_wwnn); | |
1513 | fc_lport_enter_dns(lport); | |
1514 | } | |
1515 | } | |
1516 | ||
1517 | if (flp) { | |
1518 | csp_flags = ntohs(flp->fl_csp.sp_features); | |
1519 | if ((csp_flags & FC_SP_FT_FPORT) == 0) { | |
1520 | lport->tt.disc_start(fc_lport_disc_callback, | |
1521 | lport); | |
1522 | } | |
1523 | } | |
1524 | } else { | |
1525 | FC_DBG("bad FLOGI response\n"); | |
1526 | } | |
1527 | ||
1528 | out: | |
1529 | fc_frame_free(fp); | |
1530 | err: | |
1531 | mutex_unlock(&lport->lp_mutex); | |
1532 | } | |
1533 | ||
1534 | /** | |
1535 | * fc_rport_enter_flogi - Send a FLOGI request to the fabric manager | |
1536 | * @lport: Fibre Channel local port to be logged in to the fabric | |
1537 | * | |
1538 | * Locking Note: The lport lock is expected to be held before calling | |
1539 | * this routine. | |
1540 | */ | |
1541 | void fc_lport_enter_flogi(struct fc_lport *lport) | |
1542 | { | |
1543 | struct fc_frame *fp; | |
1544 | ||
1545 | FC_DEBUG_LPORT("Processing FLOGI state\n"); | |
1546 | ||
1547 | fc_lport_state_enter(lport, LPORT_ST_FLOGI); | |
1548 | ||
1549 | fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); | |
1550 | if (!fp) | |
1551 | return fc_lport_error(lport, fp); | |
1552 | ||
1553 | if (!lport->tt.elsct_send(lport, NULL, fp, ELS_FLOGI, | |
1554 | fc_lport_flogi_resp, lport, lport->e_d_tov)) | |
1555 | fc_lport_error(lport, fp); | |
1556 | } | |
1557 | ||
1558 | /* Configure a fc_lport */ | |
1559 | int fc_lport_config(struct fc_lport *lport) | |
1560 | { | |
1561 | INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout); | |
1562 | mutex_init(&lport->lp_mutex); | |
1563 | ||
1564 | fc_lport_state_enter(lport, LPORT_ST_NONE); | |
1565 | ||
1566 | fc_lport_add_fc4_type(lport, FC_TYPE_FCP); | |
1567 | fc_lport_add_fc4_type(lport, FC_TYPE_CT); | |
1568 | ||
1569 | return 0; | |
1570 | } | |
1571 | EXPORT_SYMBOL(fc_lport_config); | |
1572 | ||
1573 | int fc_lport_init(struct fc_lport *lport) | |
1574 | { | |
1575 | if (!lport->tt.lport_recv) | |
1576 | lport->tt.lport_recv = fc_lport_recv_req; | |
1577 | ||
1578 | if (!lport->tt.lport_reset) | |
1579 | lport->tt.lport_reset = fc_lport_reset; | |
1580 | ||
1581 | fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT; | |
1582 | fc_host_node_name(lport->host) = lport->wwnn; | |
1583 | fc_host_port_name(lport->host) = lport->wwpn; | |
1584 | fc_host_supported_classes(lport->host) = FC_COS_CLASS3; | |
1585 | memset(fc_host_supported_fc4s(lport->host), 0, | |
1586 | sizeof(fc_host_supported_fc4s(lport->host))); | |
1587 | fc_host_supported_fc4s(lport->host)[2] = 1; | |
1588 | fc_host_supported_fc4s(lport->host)[7] = 1; | |
1589 | ||
1590 | /* This value is also unchanging */ | |
1591 | memset(fc_host_active_fc4s(lport->host), 0, | |
1592 | sizeof(fc_host_active_fc4s(lport->host))); | |
1593 | fc_host_active_fc4s(lport->host)[2] = 1; | |
1594 | fc_host_active_fc4s(lport->host)[7] = 1; | |
1595 | fc_host_maxframe_size(lport->host) = lport->mfs; | |
1596 | fc_host_supported_speeds(lport->host) = 0; | |
1597 | if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT) | |
1598 | fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT; | |
1599 | if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT) | |
1600 | fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT; | |
1601 | ||
1602 | return 0; | |
1603 | } | |
1604 | EXPORT_SYMBOL(fc_lport_init); |