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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 | ||
8866a5d9 RL |
98 | #include "fc_libfc.h" |
99 | ||
42e9a92f RL |
100 | /* Fabric IDs to use for point-to-point mode, chosen on whims. */ |
101 | #define FC_LOCAL_PTP_FID_LO 0x010101 | |
102 | #define FC_LOCAL_PTP_FID_HI 0x010102 | |
103 | ||
104 | #define DNS_DELAY 3 /* Discovery delay after RSCN (in seconds)*/ | |
105 | ||
42e9a92f RL |
106 | static void fc_lport_error(struct fc_lport *, struct fc_frame *); |
107 | ||
108 | static void fc_lport_enter_reset(struct fc_lport *); | |
109 | static void fc_lport_enter_flogi(struct fc_lport *); | |
110 | static void fc_lport_enter_dns(struct fc_lport *); | |
42e9a92f RL |
111 | static void fc_lport_enter_rft_id(struct fc_lport *); |
112 | static void fc_lport_enter_scr(struct fc_lport *); | |
113 | static void fc_lport_enter_ready(struct fc_lport *); | |
114 | static void fc_lport_enter_logo(struct fc_lport *); | |
115 | ||
116 | static const char *fc_lport_state_names[] = { | |
b1d9fd55 | 117 | [LPORT_ST_DISABLED] = "disabled", |
42e9a92f RL |
118 | [LPORT_ST_FLOGI] = "FLOGI", |
119 | [LPORT_ST_DNS] = "dNS", | |
42e9a92f RL |
120 | [LPORT_ST_RFT_ID] = "RFT_ID", |
121 | [LPORT_ST_SCR] = "SCR", | |
122 | [LPORT_ST_READY] = "Ready", | |
123 | [LPORT_ST_LOGO] = "LOGO", | |
124 | [LPORT_ST_RESET] = "reset", | |
125 | }; | |
126 | ||
127 | static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp) | |
128 | { | |
129 | fc_frame_free(fp); | |
130 | return 0; | |
131 | } | |
132 | ||
133 | /** | |
34f42a07 | 134 | * fc_lport_rport_callback() - Event handler for rport events |
42e9a92f | 135 | * @lport: The lport which is receiving the event |
9fb9d328 | 136 | * @rdata: private remote port data |
42e9a92f RL |
137 | * @event: The event that occured |
138 | * | |
139 | * Locking Note: The rport lock should not be held when calling | |
140 | * this function. | |
141 | */ | |
142 | static void fc_lport_rport_callback(struct fc_lport *lport, | |
9fb9d328 | 143 | struct fc_rport_priv *rdata, |
42e9a92f RL |
144 | enum fc_rport_event event) |
145 | { | |
7414705e | 146 | FC_LPORT_DBG(lport, "Received a %d event for port (%6x)\n", event, |
f211fa51 | 147 | rdata->ids.port_id); |
42e9a92f | 148 | |
b5cbf083 | 149 | mutex_lock(&lport->lp_mutex); |
42e9a92f | 150 | switch (event) { |
4c0f62b5 | 151 | case RPORT_EV_READY: |
b5cbf083 JE |
152 | if (lport->state == LPORT_ST_DNS) { |
153 | lport->dns_rp = rdata; | |
28cc0e31 | 154 | fc_lport_enter_rft_id(lport); |
b5cbf083 JE |
155 | } else { |
156 | FC_LPORT_DBG(lport, "Received an READY event " | |
157 | "on port (%6x) for the directory " | |
158 | "server, but the lport is not " | |
159 | "in the DNS state, it's in the " | |
160 | "%d state", rdata->ids.port_id, | |
161 | lport->state); | |
162 | lport->tt.rport_logoff(rdata); | |
163 | } | |
42e9a92f RL |
164 | break; |
165 | case RPORT_EV_LOGO: | |
166 | case RPORT_EV_FAILED: | |
167 | case RPORT_EV_STOP: | |
b5cbf083 | 168 | lport->dns_rp = NULL; |
42e9a92f RL |
169 | break; |
170 | case RPORT_EV_NONE: | |
171 | break; | |
172 | } | |
b5cbf083 | 173 | mutex_unlock(&lport->lp_mutex); |
42e9a92f RL |
174 | } |
175 | ||
176 | /** | |
34f42a07 | 177 | * fc_lport_state() - Return a string which represents the lport's state |
42e9a92f RL |
178 | * @lport: The lport whose state is to converted to a string |
179 | */ | |
180 | static const char *fc_lport_state(struct fc_lport *lport) | |
181 | { | |
182 | const char *cp; | |
183 | ||
184 | cp = fc_lport_state_names[lport->state]; | |
185 | if (!cp) | |
186 | cp = "unknown"; | |
187 | return cp; | |
188 | } | |
189 | ||
190 | /** | |
34f42a07 | 191 | * fc_lport_ptp_setup() - Create an rport for point-to-point mode |
42e9a92f RL |
192 | * @lport: The lport to attach the ptp rport to |
193 | * @fid: The FID of the ptp rport | |
194 | * @remote_wwpn: The WWPN of the ptp rport | |
195 | * @remote_wwnn: The WWNN of the ptp rport | |
196 | */ | |
197 | static void fc_lport_ptp_setup(struct fc_lport *lport, | |
198 | u32 remote_fid, u64 remote_wwpn, | |
199 | u64 remote_wwnn) | |
200 | { | |
48f00902 JE |
201 | mutex_lock(&lport->disc.disc_mutex); |
202 | if (lport->ptp_rp) | |
42e9a92f | 203 | lport->tt.rport_logoff(lport->ptp_rp); |
9737e6a7 RL |
204 | lport->ptp_rp = lport->tt.rport_create(lport, remote_fid); |
205 | lport->ptp_rp->ids.port_name = remote_wwpn; | |
206 | lport->ptp_rp->ids.node_name = remote_wwnn; | |
48f00902 | 207 | mutex_unlock(&lport->disc.disc_mutex); |
42e9a92f RL |
208 | |
209 | lport->tt.rport_login(lport->ptp_rp); | |
210 | ||
211 | fc_lport_enter_ready(lport); | |
212 | } | |
213 | ||
214 | void fc_get_host_port_type(struct Scsi_Host *shost) | |
215 | { | |
216 | /* TODO - currently just NPORT */ | |
217 | fc_host_port_type(shost) = FC_PORTTYPE_NPORT; | |
218 | } | |
219 | EXPORT_SYMBOL(fc_get_host_port_type); | |
220 | ||
221 | void fc_get_host_port_state(struct Scsi_Host *shost) | |
222 | { | |
223 | struct fc_lport *lp = shost_priv(shost); | |
224 | ||
8faecddb CL |
225 | mutex_lock(&lp->lp_mutex); |
226 | if (!lp->link_up) | |
227 | fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; | |
42e9a92f | 228 | else |
8faecddb CL |
229 | switch (lp->state) { |
230 | case LPORT_ST_READY: | |
231 | fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; | |
232 | break; | |
233 | default: | |
234 | fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE; | |
235 | } | |
236 | mutex_unlock(&lp->lp_mutex); | |
42e9a92f RL |
237 | } |
238 | EXPORT_SYMBOL(fc_get_host_port_state); | |
239 | ||
240 | void fc_get_host_speed(struct Scsi_Host *shost) | |
241 | { | |
242 | struct fc_lport *lport = shost_priv(shost); | |
243 | ||
244 | fc_host_speed(shost) = lport->link_speed; | |
245 | } | |
246 | EXPORT_SYMBOL(fc_get_host_speed); | |
247 | ||
248 | struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost) | |
249 | { | |
42e9a92f RL |
250 | struct fc_host_statistics *fcoe_stats; |
251 | struct fc_lport *lp = shost_priv(shost); | |
252 | struct timespec v0, v1; | |
582b45bc | 253 | unsigned int cpu; |
42e9a92f RL |
254 | |
255 | fcoe_stats = &lp->host_stats; | |
256 | memset(fcoe_stats, 0, sizeof(struct fc_host_statistics)); | |
257 | ||
258 | jiffies_to_timespec(jiffies, &v0); | |
259 | jiffies_to_timespec(lp->boot_time, &v1); | |
260 | fcoe_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec); | |
261 | ||
582b45bc RL |
262 | for_each_possible_cpu(cpu) { |
263 | struct fcoe_dev_stats *stats; | |
264 | ||
265 | stats = per_cpu_ptr(lp->dev_stats, cpu); | |
266 | ||
42e9a92f RL |
267 | fcoe_stats->tx_frames += stats->TxFrames; |
268 | fcoe_stats->tx_words += stats->TxWords; | |
269 | fcoe_stats->rx_frames += stats->RxFrames; | |
270 | fcoe_stats->rx_words += stats->RxWords; | |
271 | fcoe_stats->error_frames += stats->ErrorFrames; | |
272 | fcoe_stats->invalid_crc_count += stats->InvalidCRCCount; | |
273 | fcoe_stats->fcp_input_requests += stats->InputRequests; | |
274 | fcoe_stats->fcp_output_requests += stats->OutputRequests; | |
275 | fcoe_stats->fcp_control_requests += stats->ControlRequests; | |
276 | fcoe_stats->fcp_input_megabytes += stats->InputMegabytes; | |
277 | fcoe_stats->fcp_output_megabytes += stats->OutputMegabytes; | |
278 | fcoe_stats->link_failure_count += stats->LinkFailureCount; | |
279 | } | |
280 | fcoe_stats->lip_count = -1; | |
281 | fcoe_stats->nos_count = -1; | |
282 | fcoe_stats->loss_of_sync_count = -1; | |
283 | fcoe_stats->loss_of_signal_count = -1; | |
284 | fcoe_stats->prim_seq_protocol_err_count = -1; | |
285 | fcoe_stats->dumped_frames = -1; | |
286 | return fcoe_stats; | |
287 | } | |
288 | EXPORT_SYMBOL(fc_get_host_stats); | |
289 | ||
290 | /* | |
291 | * Fill in FLOGI command for request. | |
292 | */ | |
293 | static void | |
294 | fc_lport_flogi_fill(struct fc_lport *lport, struct fc_els_flogi *flogi, | |
295 | unsigned int op) | |
296 | { | |
297 | struct fc_els_csp *sp; | |
298 | struct fc_els_cssp *cp; | |
299 | ||
300 | memset(flogi, 0, sizeof(*flogi)); | |
301 | flogi->fl_cmd = (u8) op; | |
302 | put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn); | |
303 | put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn); | |
304 | sp = &flogi->fl_csp; | |
305 | sp->sp_hi_ver = 0x20; | |
306 | sp->sp_lo_ver = 0x20; | |
307 | sp->sp_bb_cred = htons(10); /* this gets set by gateway */ | |
308 | sp->sp_bb_data = htons((u16) lport->mfs); | |
309 | cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */ | |
310 | cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ); | |
311 | if (op != ELS_FLOGI) { | |
312 | sp->sp_features = htons(FC_SP_FT_CIRO); | |
313 | sp->sp_tot_seq = htons(255); /* seq. we accept */ | |
314 | sp->sp_rel_off = htons(0x1f); | |
315 | sp->sp_e_d_tov = htonl(lport->e_d_tov); | |
316 | ||
317 | cp->cp_rdfs = htons((u16) lport->mfs); | |
318 | cp->cp_con_seq = htons(255); | |
319 | cp->cp_open_seq = 1; | |
320 | } | |
321 | } | |
322 | ||
323 | /* | |
324 | * Add a supported FC-4 type. | |
325 | */ | |
326 | static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type) | |
327 | { | |
328 | __be32 *mp; | |
329 | ||
330 | mp = &lport->fcts.ff_type_map[type / FC_NS_BPW]; | |
331 | *mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW)); | |
332 | } | |
333 | ||
334 | /** | |
34f42a07 | 335 | * fc_lport_recv_rlir_req() - Handle received Registered Link Incident Report. |
42e9a92f RL |
336 | * @lport: Fibre Channel local port recieving the RLIR |
337 | * @sp: current sequence in the RLIR exchange | |
338 | * @fp: RLIR request frame | |
339 | * | |
1b69bc06 | 340 | * Locking Note: The lport lock is expected to be held before calling |
42e9a92f RL |
341 | * this function. |
342 | */ | |
343 | static void fc_lport_recv_rlir_req(struct fc_seq *sp, struct fc_frame *fp, | |
344 | struct fc_lport *lport) | |
345 | { | |
7414705e RL |
346 | FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n", |
347 | fc_lport_state(lport)); | |
42e9a92f RL |
348 | |
349 | lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); | |
350 | fc_frame_free(fp); | |
351 | } | |
352 | ||
353 | /** | |
34f42a07 | 354 | * fc_lport_recv_echo_req() - Handle received ECHO request |
42e9a92f RL |
355 | * @lport: Fibre Channel local port recieving the ECHO |
356 | * @sp: current sequence in the ECHO exchange | |
357 | * @fp: ECHO request frame | |
358 | * | |
1b69bc06 | 359 | * Locking Note: The lport lock is expected to be held before calling |
42e9a92f RL |
360 | * this function. |
361 | */ | |
362 | static void fc_lport_recv_echo_req(struct fc_seq *sp, struct fc_frame *in_fp, | |
363 | struct fc_lport *lport) | |
364 | { | |
365 | struct fc_frame *fp; | |
366 | struct fc_exch *ep = fc_seq_exch(sp); | |
367 | unsigned int len; | |
368 | void *pp; | |
369 | void *dp; | |
370 | u32 f_ctl; | |
371 | ||
1b69bc06 | 372 | FC_LPORT_DBG(lport, "Received ECHO request while in state %s\n", |
7414705e | 373 | fc_lport_state(lport)); |
42e9a92f RL |
374 | |
375 | len = fr_len(in_fp) - sizeof(struct fc_frame_header); | |
376 | pp = fc_frame_payload_get(in_fp, len); | |
377 | ||
378 | if (len < sizeof(__be32)) | |
379 | len = sizeof(__be32); | |
380 | ||
381 | fp = fc_frame_alloc(lport, len); | |
382 | if (fp) { | |
383 | dp = fc_frame_payload_get(fp, len); | |
384 | memcpy(dp, pp, len); | |
1b69bc06 | 385 | *((__be32 *)dp) = htonl(ELS_LS_ACC << 24); |
42e9a92f RL |
386 | sp = lport->tt.seq_start_next(sp); |
387 | f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
388 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, | |
389 | FC_TYPE_ELS, f_ctl, 0); | |
390 | lport->tt.seq_send(lport, sp, fp); | |
391 | } | |
392 | fc_frame_free(in_fp); | |
393 | } | |
394 | ||
395 | /** | |
1b69bc06 JE |
396 | * fc_lport_recv_rnid_req() - Handle received Request Node ID data request |
397 | * @sp: The sequence in the RNID exchange | |
398 | * @fp: The RNID request frame | |
399 | * @lport: The local port recieving the RNID | |
42e9a92f | 400 | * |
1b69bc06 | 401 | * Locking Note: The lport lock is expected to be held before calling |
42e9a92f RL |
402 | * this function. |
403 | */ | |
404 | static void fc_lport_recv_rnid_req(struct fc_seq *sp, struct fc_frame *in_fp, | |
405 | struct fc_lport *lport) | |
406 | { | |
407 | struct fc_frame *fp; | |
408 | struct fc_exch *ep = fc_seq_exch(sp); | |
409 | struct fc_els_rnid *req; | |
410 | struct { | |
411 | struct fc_els_rnid_resp rnid; | |
412 | struct fc_els_rnid_cid cid; | |
413 | struct fc_els_rnid_gen gen; | |
414 | } *rp; | |
415 | struct fc_seq_els_data rjt_data; | |
416 | u8 fmt; | |
417 | size_t len; | |
418 | u32 f_ctl; | |
419 | ||
7414705e RL |
420 | FC_LPORT_DBG(lport, "Received RNID request while in state %s\n", |
421 | fc_lport_state(lport)); | |
42e9a92f RL |
422 | |
423 | req = fc_frame_payload_get(in_fp, sizeof(*req)); | |
424 | if (!req) { | |
425 | rjt_data.fp = NULL; | |
426 | rjt_data.reason = ELS_RJT_LOGIC; | |
427 | rjt_data.explan = ELS_EXPL_NONE; | |
428 | lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); | |
429 | } else { | |
430 | fmt = req->rnid_fmt; | |
431 | len = sizeof(*rp); | |
432 | if (fmt != ELS_RNIDF_GEN || | |
433 | ntohl(lport->rnid_gen.rnid_atype) == 0) { | |
434 | fmt = ELS_RNIDF_NONE; /* nothing to provide */ | |
435 | len -= sizeof(rp->gen); | |
436 | } | |
437 | fp = fc_frame_alloc(lport, len); | |
438 | if (fp) { | |
439 | rp = fc_frame_payload_get(fp, len); | |
440 | memset(rp, 0, len); | |
441 | rp->rnid.rnid_cmd = ELS_LS_ACC; | |
442 | rp->rnid.rnid_fmt = fmt; | |
443 | rp->rnid.rnid_cid_len = sizeof(rp->cid); | |
444 | rp->cid.rnid_wwpn = htonll(lport->wwpn); | |
445 | rp->cid.rnid_wwnn = htonll(lport->wwnn); | |
446 | if (fmt == ELS_RNIDF_GEN) { | |
447 | rp->rnid.rnid_sid_len = sizeof(rp->gen); | |
448 | memcpy(&rp->gen, &lport->rnid_gen, | |
449 | sizeof(rp->gen)); | |
450 | } | |
451 | sp = lport->tt.seq_start_next(sp); | |
452 | f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ; | |
453 | f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
454 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, | |
455 | FC_TYPE_ELS, f_ctl, 0); | |
456 | lport->tt.seq_send(lport, sp, fp); | |
457 | } | |
458 | } | |
459 | fc_frame_free(in_fp); | |
460 | } | |
461 | ||
42e9a92f | 462 | /** |
34f42a07 | 463 | * fc_lport_recv_logo_req() - Handle received fabric LOGO request |
42e9a92f RL |
464 | * @lport: Fibre Channel local port recieving the LOGO |
465 | * @sp: current sequence in the LOGO exchange | |
466 | * @fp: LOGO request frame | |
467 | * | |
468 | * Locking Note: The lport lock is exected to be held before calling | |
469 | * this function. | |
470 | */ | |
471 | static void fc_lport_recv_logo_req(struct fc_seq *sp, struct fc_frame *fp, | |
472 | struct fc_lport *lport) | |
473 | { | |
474 | lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); | |
475 | fc_lport_enter_reset(lport); | |
476 | fc_frame_free(fp); | |
477 | } | |
478 | ||
479 | /** | |
34f42a07 | 480 | * fc_fabric_login() - Start the lport state machine |
42e9a92f RL |
481 | * @lport: The lport that should log into the fabric |
482 | * | |
483 | * Locking Note: This function should not be called | |
484 | * with the lport lock held. | |
485 | */ | |
486 | int fc_fabric_login(struct fc_lport *lport) | |
487 | { | |
488 | int rc = -1; | |
489 | ||
490 | mutex_lock(&lport->lp_mutex); | |
b1d9fd55 | 491 | if (lport->state == LPORT_ST_DISABLED) { |
42e9a92f RL |
492 | fc_lport_enter_reset(lport); |
493 | rc = 0; | |
494 | } | |
495 | mutex_unlock(&lport->lp_mutex); | |
496 | ||
497 | return rc; | |
498 | } | |
499 | EXPORT_SYMBOL(fc_fabric_login); | |
500 | ||
501 | /** | |
8faecddb | 502 | * __fc_linkup() - Handler for transport linkup events |
42e9a92f | 503 | * @lport: The lport whose link is up |
8faecddb CL |
504 | * |
505 | * Locking: must be called with the lp_mutex held | |
42e9a92f | 506 | */ |
8faecddb | 507 | void __fc_linkup(struct fc_lport *lport) |
42e9a92f | 508 | { |
bc0e17f6 VD |
509 | if (!lport->link_up) { |
510 | lport->link_up = 1; | |
42e9a92f RL |
511 | |
512 | if (lport->state == LPORT_ST_RESET) | |
513 | fc_lport_enter_flogi(lport); | |
514 | } | |
8faecddb CL |
515 | } |
516 | ||
517 | /** | |
518 | * fc_linkup() - Handler for transport linkup events | |
519 | * @lport: The lport whose link is up | |
520 | */ | |
521 | void fc_linkup(struct fc_lport *lport) | |
522 | { | |
523 | printk(KERN_INFO "libfc: Link up on port (%6x)\n", | |
524 | fc_host_port_id(lport->host)); | |
525 | ||
526 | mutex_lock(&lport->lp_mutex); | |
527 | __fc_linkup(lport); | |
42e9a92f RL |
528 | mutex_unlock(&lport->lp_mutex); |
529 | } | |
530 | EXPORT_SYMBOL(fc_linkup); | |
531 | ||
532 | /** | |
8faecddb | 533 | * __fc_linkdown() - Handler for transport linkdown events |
42e9a92f | 534 | * @lport: The lport whose link is down |
8faecddb CL |
535 | * |
536 | * Locking: must be called with the lp_mutex held | |
42e9a92f | 537 | */ |
8faecddb | 538 | void __fc_linkdown(struct fc_lport *lport) |
42e9a92f | 539 | { |
bc0e17f6 VD |
540 | if (lport->link_up) { |
541 | lport->link_up = 0; | |
42e9a92f RL |
542 | fc_lport_enter_reset(lport); |
543 | lport->tt.fcp_cleanup(lport); | |
544 | } | |
8faecddb CL |
545 | } |
546 | ||
547 | /** | |
548 | * fc_linkdown() - Handler for transport linkdown events | |
549 | * @lport: The lport whose link is down | |
550 | */ | |
551 | void fc_linkdown(struct fc_lport *lport) | |
552 | { | |
553 | printk(KERN_INFO "libfc: Link down on port (%6x)\n", | |
554 | fc_host_port_id(lport->host)); | |
555 | ||
556 | mutex_lock(&lport->lp_mutex); | |
557 | __fc_linkdown(lport); | |
42e9a92f RL |
558 | mutex_unlock(&lport->lp_mutex); |
559 | } | |
560 | EXPORT_SYMBOL(fc_linkdown); | |
561 | ||
42e9a92f | 562 | /** |
34f42a07 | 563 | * fc_fabric_logoff() - Logout of the fabric |
42e9a92f RL |
564 | * @lport: fc_lport pointer to logoff the fabric |
565 | * | |
566 | * Return value: | |
567 | * 0 for success, -1 for failure | |
34f42a07 | 568 | */ |
42e9a92f RL |
569 | int fc_fabric_logoff(struct fc_lport *lport) |
570 | { | |
571 | lport->tt.disc_stop_final(lport); | |
572 | mutex_lock(&lport->lp_mutex); | |
a0fd2e49 AJ |
573 | if (lport->dns_rp) |
574 | lport->tt.rport_logoff(lport->dns_rp); | |
575 | mutex_unlock(&lport->lp_mutex); | |
576 | lport->tt.rport_flush_queue(); | |
577 | mutex_lock(&lport->lp_mutex); | |
42e9a92f RL |
578 | fc_lport_enter_logo(lport); |
579 | mutex_unlock(&lport->lp_mutex); | |
f7db2c15 | 580 | cancel_delayed_work_sync(&lport->retry_work); |
42e9a92f RL |
581 | return 0; |
582 | } | |
583 | EXPORT_SYMBOL(fc_fabric_logoff); | |
584 | ||
585 | /** | |
34f42a07 | 586 | * fc_lport_destroy() - unregister a fc_lport |
42e9a92f RL |
587 | * @lport: fc_lport pointer to unregister |
588 | * | |
589 | * Return value: | |
590 | * None | |
591 | * Note: | |
592 | * exit routine for fc_lport instance | |
593 | * clean-up all the allocated memory | |
594 | * and free up other system resources. | |
595 | * | |
34f42a07 | 596 | */ |
42e9a92f RL |
597 | int fc_lport_destroy(struct fc_lport *lport) |
598 | { | |
bbf15669 | 599 | mutex_lock(&lport->lp_mutex); |
b1d9fd55 | 600 | lport->state = LPORT_ST_DISABLED; |
bbf15669 | 601 | lport->link_up = 0; |
42e9a92f | 602 | lport->tt.frame_send = fc_frame_drop; |
bbf15669 AJ |
603 | mutex_unlock(&lport->lp_mutex); |
604 | ||
42e9a92f | 605 | lport->tt.fcp_abort_io(lport); |
e9ba8b42 | 606 | lport->tt.disc_stop_final(lport); |
1f6ff364 | 607 | lport->tt.exch_mgr_reset(lport, 0, 0); |
42e9a92f RL |
608 | return 0; |
609 | } | |
610 | EXPORT_SYMBOL(fc_lport_destroy); | |
611 | ||
612 | /** | |
34f42a07 | 613 | * fc_set_mfs() - sets up the mfs for the corresponding fc_lport |
42e9a92f RL |
614 | * @lport: fc_lport pointer to unregister |
615 | * @mfs: the new mfs for fc_lport | |
616 | * | |
617 | * Set mfs for the given fc_lport to the new mfs. | |
618 | * | |
619 | * Return: 0 for success | |
34f42a07 | 620 | */ |
42e9a92f RL |
621 | int fc_set_mfs(struct fc_lport *lport, u32 mfs) |
622 | { | |
623 | unsigned int old_mfs; | |
624 | int rc = -EINVAL; | |
625 | ||
626 | mutex_lock(&lport->lp_mutex); | |
627 | ||
628 | old_mfs = lport->mfs; | |
629 | ||
630 | if (mfs >= FC_MIN_MAX_FRAME) { | |
631 | mfs &= ~3; | |
632 | if (mfs > FC_MAX_FRAME) | |
633 | mfs = FC_MAX_FRAME; | |
634 | mfs -= sizeof(struct fc_frame_header); | |
635 | lport->mfs = mfs; | |
636 | rc = 0; | |
637 | } | |
638 | ||
639 | if (!rc && mfs < old_mfs) | |
640 | fc_lport_enter_reset(lport); | |
641 | ||
642 | mutex_unlock(&lport->lp_mutex); | |
643 | ||
644 | return rc; | |
645 | } | |
646 | EXPORT_SYMBOL(fc_set_mfs); | |
647 | ||
648 | /** | |
34f42a07 | 649 | * fc_lport_disc_callback() - Callback for discovery events |
42e9a92f RL |
650 | * @lport: FC local port |
651 | * @event: The discovery event | |
652 | */ | |
653 | void fc_lport_disc_callback(struct fc_lport *lport, enum fc_disc_event event) | |
654 | { | |
655 | switch (event) { | |
656 | case DISC_EV_SUCCESS: | |
7414705e | 657 | FC_LPORT_DBG(lport, "Discovery succeeded\n"); |
42e9a92f RL |
658 | break; |
659 | case DISC_EV_FAILED: | |
7414705e RL |
660 | printk(KERN_ERR "libfc: Discovery failed for port (%6x)\n", |
661 | fc_host_port_id(lport->host)); | |
42e9a92f RL |
662 | mutex_lock(&lport->lp_mutex); |
663 | fc_lport_enter_reset(lport); | |
664 | mutex_unlock(&lport->lp_mutex); | |
665 | break; | |
666 | case DISC_EV_NONE: | |
667 | WARN_ON(1); | |
668 | break; | |
669 | } | |
670 | } | |
671 | ||
672 | /** | |
34f42a07 | 673 | * fc_rport_enter_ready() - Enter the ready state and start discovery |
42e9a92f RL |
674 | * @lport: Fibre Channel local port that is ready |
675 | * | |
676 | * Locking Note: The lport lock is expected to be held before calling | |
677 | * this routine. | |
678 | */ | |
679 | static void fc_lport_enter_ready(struct fc_lport *lport) | |
680 | { | |
7414705e RL |
681 | FC_LPORT_DBG(lport, "Entered READY from state %s\n", |
682 | fc_lport_state(lport)); | |
42e9a92f RL |
683 | |
684 | fc_lport_state_enter(lport, LPORT_ST_READY); | |
8faecddb CL |
685 | if (lport->vport) |
686 | fc_vport_set_state(lport->vport, FC_VPORT_ACTIVE); | |
687 | fc_vports_linkchange(lport); | |
42e9a92f | 688 | |
29d898e9 JE |
689 | if (!lport->ptp_rp) |
690 | lport->tt.disc_start(fc_lport_disc_callback, lport); | |
42e9a92f RL |
691 | } |
692 | ||
693 | /** | |
34f42a07 | 694 | * fc_lport_recv_flogi_req() - Receive a FLOGI request |
42e9a92f RL |
695 | * @sp_in: The sequence the FLOGI is on |
696 | * @rx_fp: The frame the FLOGI is in | |
697 | * @lport: The lport that recieved the request | |
698 | * | |
699 | * A received FLOGI request indicates a point-to-point connection. | |
700 | * Accept it with the common service parameters indicating our N port. | |
701 | * Set up to do a PLOGI if we have the higher-number WWPN. | |
702 | * | |
1b69bc06 | 703 | * Locking Note: The lport lock is expected to be held before calling |
42e9a92f RL |
704 | * this function. |
705 | */ | |
706 | static void fc_lport_recv_flogi_req(struct fc_seq *sp_in, | |
707 | struct fc_frame *rx_fp, | |
708 | struct fc_lport *lport) | |
709 | { | |
710 | struct fc_frame *fp; | |
711 | struct fc_frame_header *fh; | |
712 | struct fc_seq *sp; | |
713 | struct fc_exch *ep; | |
714 | struct fc_els_flogi *flp; | |
715 | struct fc_els_flogi *new_flp; | |
716 | u64 remote_wwpn; | |
717 | u32 remote_fid; | |
718 | u32 local_fid; | |
719 | u32 f_ctl; | |
720 | ||
7414705e RL |
721 | FC_LPORT_DBG(lport, "Received FLOGI request while in state %s\n", |
722 | fc_lport_state(lport)); | |
42e9a92f RL |
723 | |
724 | fh = fc_frame_header_get(rx_fp); | |
725 | remote_fid = ntoh24(fh->fh_s_id); | |
726 | flp = fc_frame_payload_get(rx_fp, sizeof(*flp)); | |
727 | if (!flp) | |
728 | goto out; | |
729 | remote_wwpn = get_unaligned_be64(&flp->fl_wwpn); | |
730 | if (remote_wwpn == lport->wwpn) { | |
7414705e RL |
731 | printk(KERN_WARNING "libfc: Received FLOGI from port " |
732 | "with same WWPN %llx\n", remote_wwpn); | |
42e9a92f RL |
733 | goto out; |
734 | } | |
7414705e | 735 | FC_LPORT_DBG(lport, "FLOGI from port WWPN %llx\n", remote_wwpn); |
42e9a92f RL |
736 | |
737 | /* | |
738 | * XXX what is the right thing to do for FIDs? | |
739 | * The originator might expect our S_ID to be 0xfffffe. | |
740 | * But if so, both of us could end up with the same FID. | |
741 | */ | |
742 | local_fid = FC_LOCAL_PTP_FID_LO; | |
743 | if (remote_wwpn < lport->wwpn) { | |
744 | local_fid = FC_LOCAL_PTP_FID_HI; | |
745 | if (!remote_fid || remote_fid == local_fid) | |
746 | remote_fid = FC_LOCAL_PTP_FID_LO; | |
747 | } else if (!remote_fid) { | |
748 | remote_fid = FC_LOCAL_PTP_FID_HI; | |
749 | } | |
750 | ||
751 | fc_host_port_id(lport->host) = local_fid; | |
752 | ||
753 | fp = fc_frame_alloc(lport, sizeof(*flp)); | |
754 | if (fp) { | |
755 | sp = lport->tt.seq_start_next(fr_seq(rx_fp)); | |
756 | new_flp = fc_frame_payload_get(fp, sizeof(*flp)); | |
757 | fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI); | |
758 | new_flp->fl_cmd = (u8) ELS_LS_ACC; | |
759 | ||
760 | /* | |
761 | * Send the response. If this fails, the originator should | |
762 | * repeat the sequence. | |
763 | */ | |
764 | f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ; | |
765 | ep = fc_seq_exch(sp); | |
766 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, | |
767 | FC_TYPE_ELS, f_ctl, 0); | |
768 | lport->tt.seq_send(lport, sp, fp); | |
769 | ||
770 | } else { | |
771 | fc_lport_error(lport, fp); | |
772 | } | |
773 | fc_lport_ptp_setup(lport, remote_fid, remote_wwpn, | |
774 | get_unaligned_be64(&flp->fl_wwnn)); | |
775 | ||
42e9a92f RL |
776 | out: |
777 | sp = fr_seq(rx_fp); | |
778 | fc_frame_free(rx_fp); | |
779 | } | |
780 | ||
781 | /** | |
34f42a07 | 782 | * fc_lport_recv_req() - The generic lport request handler |
42e9a92f RL |
783 | * @lport: The lport that received the request |
784 | * @sp: The sequence the request is on | |
785 | * @fp: The frame the request is in | |
786 | * | |
787 | * This function will see if the lport handles the request or | |
788 | * if an rport should handle the request. | |
789 | * | |
790 | * Locking Note: This function should not be called with the lport | |
791 | * lock held becuase it will grab the lock. | |
792 | */ | |
793 | static void fc_lport_recv_req(struct fc_lport *lport, struct fc_seq *sp, | |
794 | struct fc_frame *fp) | |
795 | { | |
796 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
797 | void (*recv) (struct fc_seq *, struct fc_frame *, struct fc_lport *); | |
42e9a92f RL |
798 | |
799 | mutex_lock(&lport->lp_mutex); | |
800 | ||
801 | /* | |
802 | * Handle special ELS cases like FLOGI, LOGO, and | |
803 | * RSCN here. These don't require a session. | |
804 | * Even if we had a session, it might not be ready. | |
805 | */ | |
e9ba8b42 JE |
806 | if (!lport->link_up) |
807 | fc_frame_free(fp); | |
808 | else if (fh->fh_type == FC_TYPE_ELS && | |
809 | fh->fh_r_ctl == FC_RCTL_ELS_REQ) { | |
42e9a92f RL |
810 | /* |
811 | * Check opcode. | |
812 | */ | |
131203a1 | 813 | recv = lport->tt.rport_recv_req; |
42e9a92f RL |
814 | switch (fc_frame_payload_op(fp)) { |
815 | case ELS_FLOGI: | |
816 | recv = fc_lport_recv_flogi_req; | |
817 | break; | |
818 | case ELS_LOGO: | |
819 | fh = fc_frame_header_get(fp); | |
820 | if (ntoh24(fh->fh_s_id) == FC_FID_FLOGI) | |
821 | recv = fc_lport_recv_logo_req; | |
822 | break; | |
823 | case ELS_RSCN: | |
824 | recv = lport->tt.disc_recv_req; | |
825 | break; | |
826 | case ELS_ECHO: | |
827 | recv = fc_lport_recv_echo_req; | |
828 | break; | |
829 | case ELS_RLIR: | |
830 | recv = fc_lport_recv_rlir_req; | |
831 | break; | |
832 | case ELS_RNID: | |
833 | recv = fc_lport_recv_rnid_req; | |
834 | break; | |
42e9a92f RL |
835 | } |
836 | ||
131203a1 | 837 | recv(sp, fp, lport); |
42e9a92f | 838 | } else { |
7414705e RL |
839 | FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)\n", |
840 | fr_eof(fp)); | |
42e9a92f RL |
841 | fc_frame_free(fp); |
842 | } | |
843 | mutex_unlock(&lport->lp_mutex); | |
844 | ||
845 | /* | |
846 | * The common exch_done for all request may not be good | |
847 | * if any request requires longer hold on exhange. XXX | |
848 | */ | |
849 | lport->tt.exch_done(sp); | |
850 | } | |
851 | ||
852 | /** | |
34f42a07 | 853 | * fc_lport_reset() - Reset an lport |
42e9a92f RL |
854 | * @lport: The lport which should be reset |
855 | * | |
856 | * Locking Note: This functions should not be called with the | |
857 | * lport lock held. | |
858 | */ | |
859 | int fc_lport_reset(struct fc_lport *lport) | |
860 | { | |
f7db2c15 | 861 | cancel_delayed_work_sync(&lport->retry_work); |
42e9a92f RL |
862 | mutex_lock(&lport->lp_mutex); |
863 | fc_lport_enter_reset(lport); | |
864 | mutex_unlock(&lport->lp_mutex); | |
865 | return 0; | |
866 | } | |
867 | EXPORT_SYMBOL(fc_lport_reset); | |
868 | ||
869 | /** | |
1190d925 | 870 | * fc_lport_reset_locked() - Reset the local port |
42e9a92f RL |
871 | * @lport: Fibre Channel local port to be reset |
872 | * | |
873 | * Locking Note: The lport lock is expected to be held before calling | |
874 | * this routine. | |
875 | */ | |
1190d925 | 876 | static void fc_lport_reset_locked(struct fc_lport *lport) |
42e9a92f | 877 | { |
42e9a92f RL |
878 | if (lport->dns_rp) |
879 | lport->tt.rport_logoff(lport->dns_rp); | |
880 | ||
48f00902 | 881 | lport->ptp_rp = NULL; |
42e9a92f RL |
882 | |
883 | lport->tt.disc_stop(lport); | |
884 | ||
1f6ff364 | 885 | lport->tt.exch_mgr_reset(lport, 0, 0); |
42e9a92f RL |
886 | fc_host_fabric_name(lport->host) = 0; |
887 | fc_host_port_id(lport->host) = 0; | |
1190d925 | 888 | } |
42e9a92f | 889 | |
1190d925 JE |
890 | /** |
891 | * fc_lport_enter_reset() - Reset the local port | |
892 | * @lport: Fibre Channel local port to be reset | |
893 | * | |
894 | * Locking Note: The lport lock is expected to be held before calling | |
895 | * this routine. | |
896 | */ | |
897 | static void fc_lport_enter_reset(struct fc_lport *lport) | |
898 | { | |
899 | FC_LPORT_DBG(lport, "Entered RESET state from %s state\n", | |
900 | fc_lport_state(lport)); | |
901 | ||
8faecddb CL |
902 | if (lport->vport) { |
903 | if (lport->link_up) | |
904 | fc_vport_set_state(lport->vport, FC_VPORT_INITIALIZING); | |
905 | else | |
906 | fc_vport_set_state(lport->vport, FC_VPORT_LINKDOWN); | |
907 | } | |
1190d925 | 908 | fc_lport_state_enter(lport, LPORT_ST_RESET); |
8faecddb | 909 | fc_vports_linkchange(lport); |
1190d925 | 910 | fc_lport_reset_locked(lport); |
bc0e17f6 | 911 | if (lport->link_up) |
42e9a92f RL |
912 | fc_lport_enter_flogi(lport); |
913 | } | |
914 | ||
1190d925 JE |
915 | /** |
916 | * fc_lport_enter_disabled() - disable the local port | |
917 | * @lport: Fibre Channel local port to be reset | |
918 | * | |
919 | * Locking Note: The lport lock is expected to be held before calling | |
920 | * this routine. | |
921 | */ | |
922 | static void fc_lport_enter_disabled(struct fc_lport *lport) | |
923 | { | |
924 | FC_LPORT_DBG(lport, "Entered disabled state from %s state\n", | |
925 | fc_lport_state(lport)); | |
926 | ||
927 | fc_lport_state_enter(lport, LPORT_ST_DISABLED); | |
8faecddb | 928 | fc_vports_linkchange(lport); |
1190d925 JE |
929 | fc_lport_reset_locked(lport); |
930 | } | |
931 | ||
42e9a92f | 932 | /** |
34f42a07 | 933 | * fc_lport_error() - Handler for any errors |
42e9a92f RL |
934 | * @lport: The fc_lport object |
935 | * @fp: The frame pointer | |
936 | * | |
937 | * If the error was caused by a resource allocation failure | |
938 | * then wait for half a second and retry, otherwise retry | |
939 | * after the e_d_tov time. | |
940 | */ | |
941 | static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp) | |
942 | { | |
943 | unsigned long delay = 0; | |
7414705e RL |
944 | FC_LPORT_DBG(lport, "Error %ld in state %s, retries %d\n", |
945 | PTR_ERR(fp), fc_lport_state(lport), | |
946 | lport->retry_count); | |
42e9a92f RL |
947 | |
948 | if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { | |
949 | /* | |
950 | * Memory allocation failure, or the exchange timed out. | |
951 | * Retry after delay | |
952 | */ | |
953 | if (lport->retry_count < lport->max_retry_count) { | |
954 | lport->retry_count++; | |
955 | if (!fp) | |
956 | delay = msecs_to_jiffies(500); | |
957 | else | |
958 | delay = msecs_to_jiffies(lport->e_d_tov); | |
959 | ||
960 | schedule_delayed_work(&lport->retry_work, delay); | |
961 | } else { | |
962 | switch (lport->state) { | |
b1d9fd55 | 963 | case LPORT_ST_DISABLED: |
42e9a92f RL |
964 | case LPORT_ST_READY: |
965 | case LPORT_ST_RESET: | |
42e9a92f RL |
966 | case LPORT_ST_RFT_ID: |
967 | case LPORT_ST_SCR: | |
968 | case LPORT_ST_DNS: | |
969 | case LPORT_ST_FLOGI: | |
970 | case LPORT_ST_LOGO: | |
971 | fc_lport_enter_reset(lport); | |
972 | break; | |
973 | } | |
974 | } | |
975 | } | |
976 | } | |
977 | ||
978 | /** | |
34f42a07 | 979 | * fc_lport_rft_id_resp() - Handle response to Register Fibre |
28cc0e31 CL |
980 | * Channel Types by ID (RFT_ID) request |
981 | * @sp: current sequence in RFT_ID exchange | |
42e9a92f RL |
982 | * @fp: response frame |
983 | * @lp_arg: Fibre Channel host port instance | |
984 | * | |
985 | * Locking Note: This function will be called without the lport lock | |
986 | * held, but it will lock, call an _enter_* function or fc_lport_error | |
987 | * and then unlock the lport. | |
988 | */ | |
989 | static void fc_lport_rft_id_resp(struct fc_seq *sp, struct fc_frame *fp, | |
990 | void *lp_arg) | |
991 | { | |
992 | struct fc_lport *lport = lp_arg; | |
993 | struct fc_frame_header *fh; | |
994 | struct fc_ct_hdr *ct; | |
995 | ||
f657d299 JE |
996 | FC_LPORT_DBG(lport, "Received a RFT_ID %s\n", fc_els_resp_type(fp)); |
997 | ||
42e9a92f RL |
998 | if (fp == ERR_PTR(-FC_EX_CLOSED)) |
999 | return; | |
1000 | ||
1001 | mutex_lock(&lport->lp_mutex); | |
1002 | ||
42e9a92f | 1003 | if (lport->state != LPORT_ST_RFT_ID) { |
7414705e RL |
1004 | FC_LPORT_DBG(lport, "Received a RFT_ID response, but in state " |
1005 | "%s\n", fc_lport_state(lport)); | |
76f6804e AJ |
1006 | if (IS_ERR(fp)) |
1007 | goto err; | |
42e9a92f RL |
1008 | goto out; |
1009 | } | |
1010 | ||
76f6804e AJ |
1011 | if (IS_ERR(fp)) { |
1012 | fc_lport_error(lport, fp); | |
1013 | goto err; | |
1014 | } | |
1015 | ||
42e9a92f RL |
1016 | fh = fc_frame_header_get(fp); |
1017 | ct = fc_frame_payload_get(fp, sizeof(*ct)); | |
1018 | ||
1019 | if (fh && ct && fh->fh_type == FC_TYPE_CT && | |
1020 | ct->ct_fs_type == FC_FST_DIR && | |
1021 | ct->ct_fs_subtype == FC_NS_SUBTYPE && | |
1022 | ntohs(ct->ct_cmd) == FC_FS_ACC) | |
1023 | fc_lport_enter_scr(lport); | |
1024 | else | |
1025 | fc_lport_error(lport, fp); | |
1026 | out: | |
1027 | fc_frame_free(fp); | |
1028 | err: | |
1029 | mutex_unlock(&lport->lp_mutex); | |
1030 | } | |
1031 | ||
42e9a92f | 1032 | /** |
34f42a07 | 1033 | * fc_lport_scr_resp() - Handle response to State Change Register (SCR) request |
42e9a92f RL |
1034 | * @sp: current sequence in SCR exchange |
1035 | * @fp: response frame | |
1036 | * @lp_arg: Fibre Channel lport port instance that sent the registration request | |
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_scr_resp(struct fc_seq *sp, struct fc_frame *fp, | |
1043 | void *lp_arg) | |
1044 | { | |
1045 | struct fc_lport *lport = lp_arg; | |
1046 | u8 op; | |
1047 | ||
f657d299 JE |
1048 | FC_LPORT_DBG(lport, "Received a SCR %s\n", fc_els_resp_type(fp)); |
1049 | ||
42e9a92f RL |
1050 | if (fp == ERR_PTR(-FC_EX_CLOSED)) |
1051 | return; | |
1052 | ||
1053 | mutex_lock(&lport->lp_mutex); | |
1054 | ||
42e9a92f | 1055 | if (lport->state != LPORT_ST_SCR) { |
7414705e RL |
1056 | FC_LPORT_DBG(lport, "Received a SCR response, but in state " |
1057 | "%s\n", fc_lport_state(lport)); | |
76f6804e AJ |
1058 | if (IS_ERR(fp)) |
1059 | goto err; | |
42e9a92f RL |
1060 | goto out; |
1061 | } | |
1062 | ||
76f6804e AJ |
1063 | if (IS_ERR(fp)) { |
1064 | fc_lport_error(lport, fp); | |
1065 | goto err; | |
1066 | } | |
1067 | ||
42e9a92f RL |
1068 | op = fc_frame_payload_op(fp); |
1069 | if (op == ELS_LS_ACC) | |
1070 | fc_lport_enter_ready(lport); | |
1071 | else | |
1072 | fc_lport_error(lport, fp); | |
1073 | ||
1074 | out: | |
1075 | fc_frame_free(fp); | |
1076 | err: | |
1077 | mutex_unlock(&lport->lp_mutex); | |
1078 | } | |
1079 | ||
1080 | /** | |
34f42a07 | 1081 | * fc_lport_enter_scr() - Send a State Change Register (SCR) request |
42e9a92f RL |
1082 | * @lport: Fibre Channel local port to register for state changes |
1083 | * | |
1084 | * Locking Note: The lport lock is expected to be held before calling | |
1085 | * this routine. | |
1086 | */ | |
1087 | static void fc_lport_enter_scr(struct fc_lport *lport) | |
1088 | { | |
1089 | struct fc_frame *fp; | |
1090 | ||
7414705e RL |
1091 | FC_LPORT_DBG(lport, "Entered SCR state from %s state\n", |
1092 | fc_lport_state(lport)); | |
42e9a92f RL |
1093 | |
1094 | fc_lport_state_enter(lport, LPORT_ST_SCR); | |
1095 | ||
1096 | fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr)); | |
1097 | if (!fp) { | |
1098 | fc_lport_error(lport, fp); | |
1099 | return; | |
1100 | } | |
1101 | ||
a46f327a | 1102 | if (!lport->tt.elsct_send(lport, FC_FID_FCTRL, fp, ELS_SCR, |
42e9a92f | 1103 | fc_lport_scr_resp, lport, lport->e_d_tov)) |
8f550f93 | 1104 | fc_lport_error(lport, NULL); |
42e9a92f RL |
1105 | } |
1106 | ||
1107 | /** | |
34f42a07 | 1108 | * fc_lport_enter_rft_id() - Register FC4-types with the name server |
42e9a92f RL |
1109 | * @lport: Fibre Channel local port to register |
1110 | * | |
1111 | * Locking Note: The lport lock is expected to be held before calling | |
1112 | * this routine. | |
1113 | */ | |
1114 | static void fc_lport_enter_rft_id(struct fc_lport *lport) | |
1115 | { | |
1116 | struct fc_frame *fp; | |
1117 | struct fc_ns_fts *lps; | |
1118 | int i; | |
1119 | ||
7414705e RL |
1120 | FC_LPORT_DBG(lport, "Entered RFT_ID state from %s state\n", |
1121 | fc_lport_state(lport)); | |
42e9a92f RL |
1122 | |
1123 | fc_lport_state_enter(lport, LPORT_ST_RFT_ID); | |
1124 | ||
1125 | lps = &lport->fcts; | |
1126 | i = sizeof(lps->ff_type_map) / sizeof(lps->ff_type_map[0]); | |
1127 | while (--i >= 0) | |
1128 | if (ntohl(lps->ff_type_map[i]) != 0) | |
1129 | break; | |
1130 | if (i < 0) { | |
1131 | /* nothing to register, move on to SCR */ | |
1132 | fc_lport_enter_scr(lport); | |
1133 | return; | |
1134 | } | |
1135 | ||
1136 | fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + | |
1137 | sizeof(struct fc_ns_rft)); | |
1138 | if (!fp) { | |
1139 | fc_lport_error(lport, fp); | |
1140 | return; | |
1141 | } | |
1142 | ||
a46f327a | 1143 | if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RFT_ID, |
42e9a92f RL |
1144 | fc_lport_rft_id_resp, |
1145 | lport, lport->e_d_tov)) | |
1146 | fc_lport_error(lport, fp); | |
1147 | } | |
1148 | ||
42e9a92f RL |
1149 | static struct fc_rport_operations fc_lport_rport_ops = { |
1150 | .event_callback = fc_lport_rport_callback, | |
1151 | }; | |
1152 | ||
1153 | /** | |
34f42a07 | 1154 | * fc_rport_enter_dns() - Create a rport to the name server |
42e9a92f RL |
1155 | * @lport: Fibre Channel local port requesting a rport for the name server |
1156 | * | |
1157 | * Locking Note: The lport lock is expected to be held before calling | |
1158 | * this routine. | |
1159 | */ | |
1160 | static void fc_lport_enter_dns(struct fc_lport *lport) | |
1161 | { | |
ab28f1fd | 1162 | struct fc_rport_priv *rdata; |
42e9a92f | 1163 | |
7414705e RL |
1164 | FC_LPORT_DBG(lport, "Entered DNS state from %s state\n", |
1165 | fc_lport_state(lport)); | |
42e9a92f RL |
1166 | |
1167 | fc_lport_state_enter(lport, LPORT_ST_DNS); | |
1168 | ||
48f00902 | 1169 | mutex_lock(&lport->disc.disc_mutex); |
9737e6a7 | 1170 | rdata = lport->tt.rport_create(lport, FC_FID_DIR_SERV); |
48f00902 | 1171 | mutex_unlock(&lport->disc.disc_mutex); |
9fb9d328 | 1172 | if (!rdata) |
42e9a92f RL |
1173 | goto err; |
1174 | ||
42e9a92f | 1175 | rdata->ops = &fc_lport_rport_ops; |
9fb9d328 | 1176 | lport->tt.rport_login(rdata); |
42e9a92f RL |
1177 | return; |
1178 | ||
1179 | err: | |
1180 | fc_lport_error(lport, NULL); | |
1181 | } | |
1182 | ||
1183 | /** | |
34f42a07 | 1184 | * fc_lport_timeout() - Handler for the retry_work timer. |
42e9a92f RL |
1185 | * @work: The work struct of the fc_lport |
1186 | */ | |
1187 | static void fc_lport_timeout(struct work_struct *work) | |
1188 | { | |
1189 | struct fc_lport *lport = | |
1190 | container_of(work, struct fc_lport, | |
1191 | retry_work.work); | |
1192 | ||
1193 | mutex_lock(&lport->lp_mutex); | |
1194 | ||
1195 | switch (lport->state) { | |
b1d9fd55 | 1196 | case LPORT_ST_DISABLED: |
22655ac2 JE |
1197 | WARN_ON(1); |
1198 | break; | |
42e9a92f | 1199 | case LPORT_ST_READY: |
42e9a92f RL |
1200 | WARN_ON(1); |
1201 | break; | |
22655ac2 JE |
1202 | case LPORT_ST_RESET: |
1203 | break; | |
42e9a92f RL |
1204 | case LPORT_ST_FLOGI: |
1205 | fc_lport_enter_flogi(lport); | |
1206 | break; | |
1207 | case LPORT_ST_DNS: | |
1208 | fc_lport_enter_dns(lport); | |
1209 | break; | |
42e9a92f RL |
1210 | case LPORT_ST_RFT_ID: |
1211 | fc_lport_enter_rft_id(lport); | |
1212 | break; | |
1213 | case LPORT_ST_SCR: | |
1214 | fc_lport_enter_scr(lport); | |
1215 | break; | |
1216 | case LPORT_ST_LOGO: | |
1217 | fc_lport_enter_logo(lport); | |
1218 | break; | |
1219 | } | |
1220 | ||
1221 | mutex_unlock(&lport->lp_mutex); | |
1222 | } | |
1223 | ||
1224 | /** | |
34f42a07 | 1225 | * fc_lport_logo_resp() - Handle response to LOGO request |
42e9a92f RL |
1226 | * @sp: current sequence in LOGO exchange |
1227 | * @fp: response frame | |
1228 | * @lp_arg: Fibre Channel lport port instance that sent the LOGO request | |
1229 | * | |
1230 | * Locking Note: This function will be called without the lport lock | |
1231 | * held, but it will lock, call an _enter_* function or fc_lport_error | |
1232 | * and then unlock the lport. | |
1233 | */ | |
11b56188 | 1234 | void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, |
42e9a92f RL |
1235 | void *lp_arg) |
1236 | { | |
1237 | struct fc_lport *lport = lp_arg; | |
1238 | u8 op; | |
1239 | ||
f657d299 JE |
1240 | FC_LPORT_DBG(lport, "Received a LOGO %s\n", fc_els_resp_type(fp)); |
1241 | ||
42e9a92f RL |
1242 | if (fp == ERR_PTR(-FC_EX_CLOSED)) |
1243 | return; | |
1244 | ||
1245 | mutex_lock(&lport->lp_mutex); | |
1246 | ||
42e9a92f | 1247 | if (lport->state != LPORT_ST_LOGO) { |
7414705e RL |
1248 | FC_LPORT_DBG(lport, "Received a LOGO response, but in state " |
1249 | "%s\n", fc_lport_state(lport)); | |
76f6804e AJ |
1250 | if (IS_ERR(fp)) |
1251 | goto err; | |
42e9a92f RL |
1252 | goto out; |
1253 | } | |
1254 | ||
76f6804e AJ |
1255 | if (IS_ERR(fp)) { |
1256 | fc_lport_error(lport, fp); | |
1257 | goto err; | |
1258 | } | |
1259 | ||
42e9a92f RL |
1260 | op = fc_frame_payload_op(fp); |
1261 | if (op == ELS_LS_ACC) | |
1190d925 | 1262 | fc_lport_enter_disabled(lport); |
42e9a92f RL |
1263 | else |
1264 | fc_lport_error(lport, fp); | |
1265 | ||
1266 | out: | |
1267 | fc_frame_free(fp); | |
1268 | err: | |
1269 | mutex_unlock(&lport->lp_mutex); | |
1270 | } | |
11b56188 | 1271 | EXPORT_SYMBOL(fc_lport_logo_resp); |
42e9a92f RL |
1272 | |
1273 | /** | |
34f42a07 | 1274 | * fc_rport_enter_logo() - Logout of the fabric |
42e9a92f RL |
1275 | * @lport: Fibre Channel local port to be logged out |
1276 | * | |
1277 | * Locking Note: The lport lock is expected to be held before calling | |
1278 | * this routine. | |
1279 | */ | |
1280 | static void fc_lport_enter_logo(struct fc_lport *lport) | |
1281 | { | |
1282 | struct fc_frame *fp; | |
1283 | struct fc_els_logo *logo; | |
1284 | ||
7414705e RL |
1285 | FC_LPORT_DBG(lport, "Entered LOGO state from %s state\n", |
1286 | fc_lport_state(lport)); | |
42e9a92f RL |
1287 | |
1288 | fc_lport_state_enter(lport, LPORT_ST_LOGO); | |
8faecddb | 1289 | fc_vports_linkchange(lport); |
42e9a92f | 1290 | |
42e9a92f RL |
1291 | fp = fc_frame_alloc(lport, sizeof(*logo)); |
1292 | if (!fp) { | |
1293 | fc_lport_error(lport, fp); | |
1294 | return; | |
1295 | } | |
1296 | ||
a46f327a JE |
1297 | if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, ELS_LOGO, |
1298 | fc_lport_logo_resp, lport, lport->e_d_tov)) | |
8f550f93 | 1299 | fc_lport_error(lport, NULL); |
42e9a92f RL |
1300 | } |
1301 | ||
1302 | /** | |
34f42a07 | 1303 | * fc_lport_flogi_resp() - Handle response to FLOGI request |
42e9a92f RL |
1304 | * @sp: current sequence in FLOGI exchange |
1305 | * @fp: response frame | |
1306 | * @lp_arg: Fibre Channel lport port instance that sent the FLOGI request | |
1307 | * | |
1308 | * Locking Note: This function will be called without the lport lock | |
1309 | * held, but it will lock, call an _enter_* function or fc_lport_error | |
1310 | * and then unlock the lport. | |
1311 | */ | |
11b56188 | 1312 | void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, |
42e9a92f RL |
1313 | void *lp_arg) |
1314 | { | |
1315 | struct fc_lport *lport = lp_arg; | |
1316 | struct fc_frame_header *fh; | |
1317 | struct fc_els_flogi *flp; | |
1318 | u32 did; | |
1319 | u16 csp_flags; | |
1320 | unsigned int r_a_tov; | |
1321 | unsigned int e_d_tov; | |
1322 | u16 mfs; | |
1323 | ||
f657d299 JE |
1324 | FC_LPORT_DBG(lport, "Received a FLOGI %s\n", fc_els_resp_type(fp)); |
1325 | ||
42e9a92f RL |
1326 | if (fp == ERR_PTR(-FC_EX_CLOSED)) |
1327 | return; | |
1328 | ||
1329 | mutex_lock(&lport->lp_mutex); | |
1330 | ||
42e9a92f | 1331 | if (lport->state != LPORT_ST_FLOGI) { |
7414705e RL |
1332 | FC_LPORT_DBG(lport, "Received a FLOGI response, but in state " |
1333 | "%s\n", fc_lport_state(lport)); | |
76f6804e AJ |
1334 | if (IS_ERR(fp)) |
1335 | goto err; | |
42e9a92f RL |
1336 | goto out; |
1337 | } | |
1338 | ||
76f6804e AJ |
1339 | if (IS_ERR(fp)) { |
1340 | fc_lport_error(lport, fp); | |
1341 | goto err; | |
1342 | } | |
1343 | ||
42e9a92f RL |
1344 | fh = fc_frame_header_get(fp); |
1345 | did = ntoh24(fh->fh_d_id); | |
1346 | if (fc_frame_payload_op(fp) == ELS_LS_ACC && did != 0) { | |
1347 | ||
7414705e RL |
1348 | printk(KERN_INFO "libfc: Assigned FID (%6x) in FLOGI response\n", |
1349 | did); | |
42e9a92f RL |
1350 | fc_host_port_id(lport->host) = did; |
1351 | ||
1352 | flp = fc_frame_payload_get(fp, sizeof(*flp)); | |
1353 | if (flp) { | |
1354 | mfs = ntohs(flp->fl_csp.sp_bb_data) & | |
1355 | FC_SP_BB_DATA_MASK; | |
1356 | if (mfs >= FC_SP_MIN_MAX_PAYLOAD && | |
1357 | mfs < lport->mfs) | |
1358 | lport->mfs = mfs; | |
1359 | csp_flags = ntohs(flp->fl_csp.sp_features); | |
1360 | r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov); | |
1361 | e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov); | |
1362 | if (csp_flags & FC_SP_FT_EDTR) | |
1363 | e_d_tov /= 1000000; | |
db36c06c CL |
1364 | |
1365 | lport->npiv_enabled = !!(csp_flags & FC_SP_FT_NPIV_ACC); | |
1366 | ||
42e9a92f RL |
1367 | if ((csp_flags & FC_SP_FT_FPORT) == 0) { |
1368 | if (e_d_tov > lport->e_d_tov) | |
1369 | lport->e_d_tov = e_d_tov; | |
1370 | lport->r_a_tov = 2 * e_d_tov; | |
7414705e RL |
1371 | printk(KERN_INFO "libfc: Port (%6x) entered " |
1372 | "point to point mode\n", did); | |
42e9a92f RL |
1373 | fc_lport_ptp_setup(lport, ntoh24(fh->fh_s_id), |
1374 | get_unaligned_be64( | |
1375 | &flp->fl_wwpn), | |
1376 | get_unaligned_be64( | |
1377 | &flp->fl_wwnn)); | |
1378 | } else { | |
1379 | lport->e_d_tov = e_d_tov; | |
1380 | lport->r_a_tov = r_a_tov; | |
1381 | fc_host_fabric_name(lport->host) = | |
1382 | get_unaligned_be64(&flp->fl_wwnn); | |
1383 | fc_lport_enter_dns(lport); | |
1384 | } | |
1385 | } | |
42e9a92f | 1386 | } else { |
7414705e | 1387 | FC_LPORT_DBG(lport, "Bad FLOGI response\n"); |
42e9a92f RL |
1388 | } |
1389 | ||
1390 | out: | |
1391 | fc_frame_free(fp); | |
1392 | err: | |
1393 | mutex_unlock(&lport->lp_mutex); | |
1394 | } | |
11b56188 | 1395 | EXPORT_SYMBOL(fc_lport_flogi_resp); |
42e9a92f RL |
1396 | |
1397 | /** | |
34f42a07 | 1398 | * fc_rport_enter_flogi() - Send a FLOGI request to the fabric manager |
42e9a92f RL |
1399 | * @lport: Fibre Channel local port to be logged in to the fabric |
1400 | * | |
1401 | * Locking Note: The lport lock is expected to be held before calling | |
1402 | * this routine. | |
1403 | */ | |
1404 | void fc_lport_enter_flogi(struct fc_lport *lport) | |
1405 | { | |
1406 | struct fc_frame *fp; | |
1407 | ||
7414705e RL |
1408 | FC_LPORT_DBG(lport, "Entered FLOGI state from %s state\n", |
1409 | fc_lport_state(lport)); | |
42e9a92f RL |
1410 | |
1411 | fc_lport_state_enter(lport, LPORT_ST_FLOGI); | |
1412 | ||
1413 | fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); | |
1414 | if (!fp) | |
1415 | return fc_lport_error(lport, fp); | |
1416 | ||
db36c06c CL |
1417 | if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, |
1418 | lport->vport ? ELS_FDISC : ELS_FLOGI, | |
42e9a92f | 1419 | fc_lport_flogi_resp, lport, lport->e_d_tov)) |
8f550f93 | 1420 | fc_lport_error(lport, NULL); |
42e9a92f RL |
1421 | } |
1422 | ||
1423 | /* Configure a fc_lport */ | |
1424 | int fc_lport_config(struct fc_lport *lport) | |
1425 | { | |
1426 | INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout); | |
1427 | mutex_init(&lport->lp_mutex); | |
1428 | ||
b1d9fd55 | 1429 | fc_lport_state_enter(lport, LPORT_ST_DISABLED); |
42e9a92f RL |
1430 | |
1431 | fc_lport_add_fc4_type(lport, FC_TYPE_FCP); | |
1432 | fc_lport_add_fc4_type(lport, FC_TYPE_CT); | |
1433 | ||
1434 | return 0; | |
1435 | } | |
1436 | EXPORT_SYMBOL(fc_lport_config); | |
1437 | ||
1438 | int fc_lport_init(struct fc_lport *lport) | |
1439 | { | |
1440 | if (!lport->tt.lport_recv) | |
1441 | lport->tt.lport_recv = fc_lport_recv_req; | |
1442 | ||
1443 | if (!lport->tt.lport_reset) | |
1444 | lport->tt.lport_reset = fc_lport_reset; | |
1445 | ||
1446 | fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT; | |
1447 | fc_host_node_name(lport->host) = lport->wwnn; | |
1448 | fc_host_port_name(lport->host) = lport->wwpn; | |
1449 | fc_host_supported_classes(lport->host) = FC_COS_CLASS3; | |
1450 | memset(fc_host_supported_fc4s(lport->host), 0, | |
1451 | sizeof(fc_host_supported_fc4s(lport->host))); | |
1452 | fc_host_supported_fc4s(lport->host)[2] = 1; | |
1453 | fc_host_supported_fc4s(lport->host)[7] = 1; | |
1454 | ||
1455 | /* This value is also unchanging */ | |
1456 | memset(fc_host_active_fc4s(lport->host), 0, | |
1457 | sizeof(fc_host_active_fc4s(lport->host))); | |
1458 | fc_host_active_fc4s(lport->host)[2] = 1; | |
1459 | fc_host_active_fc4s(lport->host)[7] = 1; | |
1460 | fc_host_maxframe_size(lport->host) = lport->mfs; | |
1461 | fc_host_supported_speeds(lport->host) = 0; | |
1462 | if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT) | |
1463 | fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT; | |
1464 | if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT) | |
1465 | fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT; | |
1466 | ||
1467 | return 0; | |
1468 | } | |
1469 | EXPORT_SYMBOL(fc_lport_init); |