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42e9a92f RL |
1 | /* |
2 | * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | * | |
17 | * Maintained at www.Open-FCoE.org | |
18 | */ | |
19 | ||
20 | /* | |
21 | * RPORT GENERAL INFO | |
22 | * | |
23 | * This file contains all processing regarding fc_rports. It contains the | |
24 | * rport state machine and does all rport interaction with the transport class. | |
25 | * There should be no other places in libfc that interact directly with the | |
26 | * transport class in regards to adding and deleting rports. | |
27 | * | |
28 | * fc_rport's represent N_Port's within the fabric. | |
29 | */ | |
30 | ||
31 | /* | |
32 | * RPORT LOCKING | |
33 | * | |
34 | * The rport should never hold the rport mutex and then attempt to acquire | |
35 | * either the lport or disc mutexes. The rport's mutex is considered lesser | |
36 | * than both the lport's mutex and the disc mutex. Refer to fc_lport.c for | |
37 | * more comments on the heirarchy. | |
38 | * | |
39 | * The locking strategy is similar to the lport's strategy. The lock protects | |
40 | * the rport's states and is held and released by the entry points to the rport | |
41 | * block. All _enter_* functions correspond to rport states and expect the rport | |
42 | * mutex to be locked before calling them. This means that rports only handle | |
43 | * one request or response at a time, since they're not critical for the I/O | |
44 | * path this potential over-use of the mutex is acceptable. | |
45 | */ | |
46 | ||
47 | #include <linux/kernel.h> | |
48 | #include <linux/spinlock.h> | |
49 | #include <linux/interrupt.h> | |
50 | #include <linux/rcupdate.h> | |
51 | #include <linux/timer.h> | |
52 | #include <linux/workqueue.h> | |
53 | #include <asm/unaligned.h> | |
54 | ||
55 | #include <scsi/libfc.h> | |
56 | #include <scsi/fc_encode.h> | |
57 | ||
42e9a92f RL |
58 | struct workqueue_struct *rport_event_queue; |
59 | ||
9fb9d328 JE |
60 | static void fc_rport_enter_plogi(struct fc_rport_priv *); |
61 | static void fc_rport_enter_prli(struct fc_rport_priv *); | |
62 | static void fc_rport_enter_rtv(struct fc_rport_priv *); | |
63 | static void fc_rport_enter_ready(struct fc_rport_priv *); | |
64 | static void fc_rport_enter_logo(struct fc_rport_priv *); | |
42e9a92f | 65 | |
9fb9d328 | 66 | static void fc_rport_recv_plogi_req(struct fc_rport_priv *, |
42e9a92f | 67 | struct fc_seq *, struct fc_frame *); |
9fb9d328 | 68 | static void fc_rport_recv_prli_req(struct fc_rport_priv *, |
42e9a92f | 69 | struct fc_seq *, struct fc_frame *); |
9fb9d328 | 70 | static void fc_rport_recv_prlo_req(struct fc_rport_priv *, |
42e9a92f | 71 | struct fc_seq *, struct fc_frame *); |
9fb9d328 | 72 | static void fc_rport_recv_logo_req(struct fc_rport_priv *, |
42e9a92f RL |
73 | struct fc_seq *, struct fc_frame *); |
74 | static void fc_rport_timeout(struct work_struct *); | |
9fb9d328 JE |
75 | static void fc_rport_error(struct fc_rport_priv *, struct fc_frame *); |
76 | static void fc_rport_error_retry(struct fc_rport_priv *, struct fc_frame *); | |
42e9a92f RL |
77 | static void fc_rport_work(struct work_struct *); |
78 | ||
79 | static const char *fc_rport_state_names[] = { | |
42e9a92f RL |
80 | [RPORT_ST_INIT] = "Init", |
81 | [RPORT_ST_PLOGI] = "PLOGI", | |
82 | [RPORT_ST_PRLI] = "PRLI", | |
83 | [RPORT_ST_RTV] = "RTV", | |
84 | [RPORT_ST_READY] = "Ready", | |
85 | [RPORT_ST_LOGO] = "LOGO", | |
14194054 | 86 | [RPORT_ST_DELETE] = "Delete", |
42e9a92f RL |
87 | }; |
88 | ||
9e9d0452 JE |
89 | /** |
90 | * fc_rport_create() - create remote port in INIT state. | |
91 | * @lport: local port. | |
92 | * @ids: remote port identifiers. | |
93 | * | |
48f00902 | 94 | * Locking note: must be called with the disc_mutex held. |
9e9d0452 JE |
95 | */ |
96 | static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, | |
97 | struct fc_rport_identifiers *ids) | |
42e9a92f | 98 | { |
ab28f1fd | 99 | struct fc_rport_priv *rdata; |
42e9a92f | 100 | |
9e9d0452 JE |
101 | rdata = kzalloc(sizeof(*rdata), GFP_KERNEL); |
102 | if (!rdata) | |
42e9a92f RL |
103 | return NULL; |
104 | ||
f211fa51 JE |
105 | rdata->ids = *ids; |
106 | kref_init(&rdata->kref); | |
42e9a92f | 107 | mutex_init(&rdata->rp_mutex); |
795d86f5 | 108 | rdata->local_port = lport; |
42e9a92f RL |
109 | rdata->rp_state = RPORT_ST_INIT; |
110 | rdata->event = RPORT_EV_NONE; | |
111 | rdata->flags = FC_RP_FLAGS_REC_SUPPORTED; | |
795d86f5 JE |
112 | rdata->e_d_tov = lport->e_d_tov; |
113 | rdata->r_a_tov = lport->r_a_tov; | |
f211fa51 | 114 | rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; |
42e9a92f RL |
115 | INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout); |
116 | INIT_WORK(&rdata->event_work, fc_rport_work); | |
48f00902 JE |
117 | if (ids->port_id != FC_FID_DIR_SERV) |
118 | list_add(&rdata->peers, &lport->disc.rports); | |
9fb9d328 | 119 | return rdata; |
42e9a92f RL |
120 | } |
121 | ||
f211fa51 JE |
122 | /** |
123 | * fc_rport_destroy() - free a remote port after last reference is released. | |
124 | * @kref: pointer to kref inside struct fc_rport_priv | |
125 | */ | |
126 | static void fc_rport_destroy(struct kref *kref) | |
127 | { | |
128 | struct fc_rport_priv *rdata; | |
f211fa51 JE |
129 | |
130 | rdata = container_of(kref, struct fc_rport_priv, kref); | |
9e9d0452 | 131 | kfree(rdata); |
f211fa51 JE |
132 | } |
133 | ||
42e9a92f | 134 | /** |
34f42a07 | 135 | * fc_rport_state() - return a string for the state the rport is in |
9fb9d328 | 136 | * @rdata: remote port private data |
42e9a92f | 137 | */ |
9fb9d328 | 138 | static const char *fc_rport_state(struct fc_rport_priv *rdata) |
42e9a92f RL |
139 | { |
140 | const char *cp; | |
42e9a92f RL |
141 | |
142 | cp = fc_rport_state_names[rdata->rp_state]; | |
143 | if (!cp) | |
144 | cp = "Unknown"; | |
145 | return cp; | |
146 | } | |
147 | ||
148 | /** | |
34f42a07 | 149 | * fc_set_rport_loss_tmo() - Set the remote port loss timeout in seconds. |
42e9a92f RL |
150 | * @rport: Pointer to Fibre Channel remote port structure |
151 | * @timeout: timeout in seconds | |
152 | */ | |
153 | void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout) | |
154 | { | |
155 | if (timeout) | |
156 | rport->dev_loss_tmo = timeout + 5; | |
157 | else | |
158 | rport->dev_loss_tmo = 30; | |
159 | } | |
160 | EXPORT_SYMBOL(fc_set_rport_loss_tmo); | |
161 | ||
162 | /** | |
34f42a07 | 163 | * fc_plogi_get_maxframe() - Get max payload from the common service parameters |
42e9a92f RL |
164 | * @flp: FLOGI payload structure |
165 | * @maxval: upper limit, may be less than what is in the service parameters | |
166 | */ | |
b2ab99c9 RL |
167 | static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp, |
168 | unsigned int maxval) | |
42e9a92f RL |
169 | { |
170 | unsigned int mfs; | |
171 | ||
172 | /* | |
173 | * Get max payload from the common service parameters and the | |
174 | * class 3 receive data field size. | |
175 | */ | |
176 | mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK; | |
177 | if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) | |
178 | maxval = mfs; | |
179 | mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs); | |
180 | if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) | |
181 | maxval = mfs; | |
182 | return maxval; | |
183 | } | |
184 | ||
185 | /** | |
34f42a07 | 186 | * fc_rport_state_enter() - Change the rport's state |
9fb9d328 | 187 | * @rdata: The rport whose state should change |
42e9a92f RL |
188 | * @new: The new state of the rport |
189 | * | |
190 | * Locking Note: Called with the rport lock held | |
191 | */ | |
9fb9d328 | 192 | static void fc_rport_state_enter(struct fc_rport_priv *rdata, |
42e9a92f RL |
193 | enum fc_rport_state new) |
194 | { | |
42e9a92f RL |
195 | if (rdata->rp_state != new) |
196 | rdata->retries = 0; | |
197 | rdata->rp_state = new; | |
198 | } | |
199 | ||
200 | static void fc_rport_work(struct work_struct *work) | |
201 | { | |
571f824c | 202 | u32 port_id; |
ab28f1fd JE |
203 | struct fc_rport_priv *rdata = |
204 | container_of(work, struct fc_rport_priv, event_work); | |
9e9d0452 | 205 | struct fc_rport_libfc_priv *rp; |
42e9a92f | 206 | enum fc_rport_event event; |
42e9a92f RL |
207 | struct fc_lport *lport = rdata->local_port; |
208 | struct fc_rport_operations *rport_ops; | |
629f4427 | 209 | struct fc_rport_identifiers ids; |
f211fa51 | 210 | struct fc_rport *rport; |
42e9a92f RL |
211 | |
212 | mutex_lock(&rdata->rp_mutex); | |
213 | event = rdata->event; | |
214 | rport_ops = rdata->ops; | |
f211fa51 | 215 | rport = rdata->rport; |
42e9a92f | 216 | |
9e9d0452 JE |
217 | FC_RPORT_DBG(rdata, "work event %u\n", event); |
218 | ||
629f4427 | 219 | switch (event) { |
4c0f62b5 | 220 | case RPORT_EV_READY: |
f211fa51 | 221 | ids = rdata->ids; |
5f7ea3b7 | 222 | rdata->event = RPORT_EV_NONE; |
9e9d0452 | 223 | kref_get(&rdata->kref); |
42e9a92f RL |
224 | mutex_unlock(&rdata->rp_mutex); |
225 | ||
9e9d0452 JE |
226 | if (!rport) |
227 | rport = fc_remote_port_add(lport->host, 0, &ids); | |
228 | if (!rport) { | |
229 | FC_RPORT_DBG(rdata, "Failed to add the rport\n"); | |
230 | lport->tt.rport_logoff(rdata); | |
231 | kref_put(&rdata->kref, lport->tt.rport_destroy); | |
232 | return; | |
42e9a92f | 233 | } |
9e9d0452 JE |
234 | mutex_lock(&rdata->rp_mutex); |
235 | if (rdata->rport) | |
236 | FC_RPORT_DBG(rdata, "rport already allocated\n"); | |
237 | rdata->rport = rport; | |
238 | rport->maxframe_size = rdata->maxframe_size; | |
239 | rport->supported_classes = rdata->supported_classes; | |
240 | ||
241 | rp = rport->dd_data; | |
242 | rp->local_port = lport; | |
243 | rp->rp_state = rdata->rp_state; | |
244 | rp->flags = rdata->flags; | |
245 | rp->e_d_tov = rdata->e_d_tov; | |
246 | rp->r_a_tov = rdata->r_a_tov; | |
247 | mutex_unlock(&rdata->rp_mutex); | |
248 | ||
249 | if (rport_ops->event_callback) { | |
250 | FC_RPORT_DBG(rdata, "callback ev %d\n", event); | |
9fb9d328 | 251 | rport_ops->event_callback(lport, rdata, event); |
9e9d0452 JE |
252 | } |
253 | kref_put(&rdata->kref, lport->tt.rport_destroy); | |
629f4427 JE |
254 | break; |
255 | ||
256 | case RPORT_EV_FAILED: | |
257 | case RPORT_EV_LOGO: | |
258 | case RPORT_EV_STOP: | |
9e9d0452 | 259 | port_id = rdata->ids.port_id; |
42e9a92f | 260 | mutex_unlock(&rdata->rp_mutex); |
9e9d0452 | 261 | |
48f00902 JE |
262 | if (port_id != FC_FID_DIR_SERV) { |
263 | mutex_lock(&lport->disc.disc_mutex); | |
264 | list_del(&rdata->peers); | |
265 | mutex_unlock(&lport->disc.disc_mutex); | |
266 | } | |
267 | ||
9e9d0452 JE |
268 | if (rport_ops->event_callback) { |
269 | FC_RPORT_DBG(rdata, "callback ev %d\n", event); | |
9fb9d328 | 270 | rport_ops->event_callback(lport, rdata, event); |
9e9d0452 | 271 | } |
201e5795 | 272 | cancel_delayed_work_sync(&rdata->retry_work); |
9e9d0452 JE |
273 | |
274 | /* | |
275 | * Reset any outstanding exchanges before freeing rport. | |
276 | */ | |
277 | lport->tt.exch_mgr_reset(lport, 0, port_id); | |
278 | lport->tt.exch_mgr_reset(lport, port_id, 0); | |
279 | ||
280 | if (rport) { | |
281 | rp = rport->dd_data; | |
282 | rp->rp_state = RPORT_ST_DELETE; | |
283 | mutex_lock(&rdata->rp_mutex); | |
284 | rdata->rport = NULL; | |
285 | mutex_unlock(&rdata->rp_mutex); | |
42e9a92f | 286 | fc_remote_port_delete(rport); |
571f824c | 287 | } |
9e9d0452 | 288 | kref_put(&rdata->kref, lport->tt.rport_destroy); |
629f4427 JE |
289 | break; |
290 | ||
291 | default: | |
42e9a92f | 292 | mutex_unlock(&rdata->rp_mutex); |
629f4427 JE |
293 | break; |
294 | } | |
42e9a92f RL |
295 | } |
296 | ||
297 | /** | |
34f42a07 | 298 | * fc_rport_login() - Start the remote port login state machine |
9fb9d328 | 299 | * @rdata: private remote port |
42e9a92f RL |
300 | * |
301 | * Locking Note: Called without the rport lock held. This | |
302 | * function will hold the rport lock, call an _enter_* | |
303 | * function and then unlock the rport. | |
304 | */ | |
9fb9d328 | 305 | int fc_rport_login(struct fc_rport_priv *rdata) |
42e9a92f | 306 | { |
42e9a92f RL |
307 | mutex_lock(&rdata->rp_mutex); |
308 | ||
9fb9d328 | 309 | FC_RPORT_DBG(rdata, "Login to port\n"); |
42e9a92f | 310 | |
9fb9d328 | 311 | fc_rport_enter_plogi(rdata); |
42e9a92f RL |
312 | |
313 | mutex_unlock(&rdata->rp_mutex); | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
5f7ea3b7 JE |
318 | /** |
319 | * fc_rport_enter_delete() - schedule a remote port to be deleted. | |
9fb9d328 | 320 | * @rdata: private remote port |
5f7ea3b7 JE |
321 | * @event: event to report as the reason for deletion |
322 | * | |
323 | * Locking Note: Called with the rport lock held. | |
324 | * | |
325 | * Allow state change into DELETE only once. | |
326 | * | |
327 | * Call queue_work only if there's no event already pending. | |
328 | * Set the new event so that the old pending event will not occur. | |
329 | * Since we have the mutex, even if fc_rport_work() is already started, | |
330 | * it'll see the new event. | |
331 | */ | |
9fb9d328 | 332 | static void fc_rport_enter_delete(struct fc_rport_priv *rdata, |
5f7ea3b7 JE |
333 | enum fc_rport_event event) |
334 | { | |
5f7ea3b7 JE |
335 | if (rdata->rp_state == RPORT_ST_DELETE) |
336 | return; | |
337 | ||
9fb9d328 | 338 | FC_RPORT_DBG(rdata, "Delete port\n"); |
5f7ea3b7 | 339 | |
9fb9d328 | 340 | fc_rport_state_enter(rdata, RPORT_ST_DELETE); |
5f7ea3b7 JE |
341 | |
342 | if (rdata->event == RPORT_EV_NONE) | |
343 | queue_work(rport_event_queue, &rdata->event_work); | |
344 | rdata->event = event; | |
345 | } | |
346 | ||
42e9a92f | 347 | /** |
34f42a07 | 348 | * fc_rport_logoff() - Logoff and remove an rport |
9fb9d328 | 349 | * @rdata: private remote port |
42e9a92f RL |
350 | * |
351 | * Locking Note: Called without the rport lock held. This | |
352 | * function will hold the rport lock, call an _enter_* | |
353 | * function and then unlock the rport. | |
354 | */ | |
9fb9d328 | 355 | int fc_rport_logoff(struct fc_rport_priv *rdata) |
42e9a92f | 356 | { |
42e9a92f RL |
357 | mutex_lock(&rdata->rp_mutex); |
358 | ||
9fb9d328 | 359 | FC_RPORT_DBG(rdata, "Remove port\n"); |
42e9a92f | 360 | |
14194054 | 361 | if (rdata->rp_state == RPORT_ST_DELETE) { |
9fb9d328 | 362 | FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n"); |
b4c6f546 AJ |
363 | mutex_unlock(&rdata->rp_mutex); |
364 | goto out; | |
365 | } | |
366 | ||
9fb9d328 | 367 | fc_rport_enter_logo(rdata); |
42e9a92f RL |
368 | |
369 | /* | |
14194054 | 370 | * Change the state to Delete so that we discard |
42e9a92f RL |
371 | * the response. |
372 | */ | |
9fb9d328 | 373 | fc_rport_enter_delete(rdata, RPORT_EV_STOP); |
42e9a92f RL |
374 | mutex_unlock(&rdata->rp_mutex); |
375 | ||
b4c6f546 | 376 | out: |
42e9a92f RL |
377 | return 0; |
378 | } | |
379 | ||
380 | /** | |
34f42a07 | 381 | * fc_rport_enter_ready() - The rport is ready |
9fb9d328 | 382 | * @rdata: private remote port |
42e9a92f RL |
383 | * |
384 | * Locking Note: The rport lock is expected to be held before calling | |
385 | * this routine. | |
386 | */ | |
9fb9d328 | 387 | static void fc_rport_enter_ready(struct fc_rport_priv *rdata) |
42e9a92f | 388 | { |
9fb9d328 | 389 | fc_rport_state_enter(rdata, RPORT_ST_READY); |
42e9a92f | 390 | |
9fb9d328 | 391 | FC_RPORT_DBG(rdata, "Port is Ready\n"); |
42e9a92f | 392 | |
5f7ea3b7 JE |
393 | if (rdata->event == RPORT_EV_NONE) |
394 | queue_work(rport_event_queue, &rdata->event_work); | |
4c0f62b5 | 395 | rdata->event = RPORT_EV_READY; |
42e9a92f RL |
396 | } |
397 | ||
398 | /** | |
34f42a07 | 399 | * fc_rport_timeout() - Handler for the retry_work timer. |
ab28f1fd | 400 | * @work: The work struct of the fc_rport_priv |
42e9a92f RL |
401 | * |
402 | * Locking Note: Called without the rport lock held. This | |
403 | * function will hold the rport lock, call an _enter_* | |
404 | * function and then unlock the rport. | |
405 | */ | |
406 | static void fc_rport_timeout(struct work_struct *work) | |
407 | { | |
ab28f1fd JE |
408 | struct fc_rport_priv *rdata = |
409 | container_of(work, struct fc_rport_priv, retry_work.work); | |
42e9a92f RL |
410 | |
411 | mutex_lock(&rdata->rp_mutex); | |
412 | ||
413 | switch (rdata->rp_state) { | |
414 | case RPORT_ST_PLOGI: | |
9fb9d328 | 415 | fc_rport_enter_plogi(rdata); |
42e9a92f RL |
416 | break; |
417 | case RPORT_ST_PRLI: | |
9fb9d328 | 418 | fc_rport_enter_prli(rdata); |
42e9a92f RL |
419 | break; |
420 | case RPORT_ST_RTV: | |
9fb9d328 | 421 | fc_rport_enter_rtv(rdata); |
42e9a92f RL |
422 | break; |
423 | case RPORT_ST_LOGO: | |
9fb9d328 | 424 | fc_rport_enter_logo(rdata); |
42e9a92f RL |
425 | break; |
426 | case RPORT_ST_READY: | |
427 | case RPORT_ST_INIT: | |
14194054 | 428 | case RPORT_ST_DELETE: |
42e9a92f RL |
429 | break; |
430 | } | |
431 | ||
432 | mutex_unlock(&rdata->rp_mutex); | |
42e9a92f RL |
433 | } |
434 | ||
435 | /** | |
34f42a07 | 436 | * fc_rport_error() - Error handler, called once retries have been exhausted |
9fb9d328 | 437 | * @rdata: private remote port |
42e9a92f RL |
438 | * @fp: The frame pointer |
439 | * | |
42e9a92f RL |
440 | * Locking Note: The rport lock is expected to be held before |
441 | * calling this routine | |
442 | */ | |
9fb9d328 | 443 | static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp) |
42e9a92f | 444 | { |
9fb9d328 | 445 | FC_RPORT_DBG(rdata, "Error %ld in state %s, retries %d\n", |
cdbe6dfe JE |
446 | IS_ERR(fp) ? -PTR_ERR(fp) : 0, |
447 | fc_rport_state(rdata), rdata->retries); | |
42e9a92f | 448 | |
6755db1c CL |
449 | switch (rdata->rp_state) { |
450 | case RPORT_ST_PLOGI: | |
451 | case RPORT_ST_PRLI: | |
452 | case RPORT_ST_LOGO: | |
9fb9d328 | 453 | fc_rport_enter_delete(rdata, RPORT_EV_FAILED); |
6755db1c CL |
454 | break; |
455 | case RPORT_ST_RTV: | |
9fb9d328 | 456 | fc_rport_enter_ready(rdata); |
6755db1c | 457 | break; |
14194054 | 458 | case RPORT_ST_DELETE: |
6755db1c CL |
459 | case RPORT_ST_READY: |
460 | case RPORT_ST_INIT: | |
461 | break; | |
42e9a92f RL |
462 | } |
463 | } | |
464 | ||
6755db1c | 465 | /** |
34f42a07 | 466 | * fc_rport_error_retry() - Error handler when retries are desired |
9fb9d328 | 467 | * @rdata: private remote port data |
6755db1c CL |
468 | * @fp: The frame pointer |
469 | * | |
470 | * If the error was an exchange timeout retry immediately, | |
471 | * otherwise wait for E_D_TOV. | |
472 | * | |
473 | * Locking Note: The rport lock is expected to be held before | |
474 | * calling this routine | |
475 | */ | |
9fb9d328 JE |
476 | static void fc_rport_error_retry(struct fc_rport_priv *rdata, |
477 | struct fc_frame *fp) | |
6755db1c | 478 | { |
6755db1c CL |
479 | unsigned long delay = FC_DEF_E_D_TOV; |
480 | ||
481 | /* make sure this isn't an FC_EX_CLOSED error, never retry those */ | |
482 | if (PTR_ERR(fp) == -FC_EX_CLOSED) | |
9fb9d328 | 483 | return fc_rport_error(rdata, fp); |
6755db1c | 484 | |
a3666955 | 485 | if (rdata->retries < rdata->local_port->max_rport_retry_count) { |
9fb9d328 JE |
486 | FC_RPORT_DBG(rdata, "Error %ld in state %s, retrying\n", |
487 | PTR_ERR(fp), fc_rport_state(rdata)); | |
6755db1c CL |
488 | rdata->retries++; |
489 | /* no additional delay on exchange timeouts */ | |
490 | if (PTR_ERR(fp) == -FC_EX_TIMEOUT) | |
491 | delay = 0; | |
6755db1c CL |
492 | schedule_delayed_work(&rdata->retry_work, delay); |
493 | return; | |
494 | } | |
495 | ||
9fb9d328 | 496 | return fc_rport_error(rdata, fp); |
6755db1c CL |
497 | } |
498 | ||
42e9a92f | 499 | /** |
34f42a07 | 500 | * fc_rport_plogi_recv_resp() - Handle incoming ELS PLOGI response |
42e9a92f RL |
501 | * @sp: current sequence in the PLOGI exchange |
502 | * @fp: response frame | |
9fb9d328 | 503 | * @rdata_arg: private remote port data |
42e9a92f RL |
504 | * |
505 | * Locking Note: This function will be called without the rport lock | |
506 | * held, but it will lock, call an _enter_* function or fc_rport_error | |
507 | * and then unlock the rport. | |
508 | */ | |
509 | static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp, | |
9fb9d328 | 510 | void *rdata_arg) |
42e9a92f | 511 | { |
9fb9d328 | 512 | struct fc_rport_priv *rdata = rdata_arg; |
42e9a92f | 513 | struct fc_lport *lport = rdata->local_port; |
a29e7646 | 514 | struct fc_els_flogi *plp = NULL; |
42e9a92f RL |
515 | unsigned int tov; |
516 | u16 csp_seq; | |
517 | u16 cssp_seq; | |
518 | u8 op; | |
519 | ||
520 | mutex_lock(&rdata->rp_mutex); | |
521 | ||
9fb9d328 | 522 | FC_RPORT_DBG(rdata, "Received a PLOGI response\n"); |
42e9a92f RL |
523 | |
524 | if (rdata->rp_state != RPORT_ST_PLOGI) { | |
9fb9d328 JE |
525 | FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state " |
526 | "%s\n", fc_rport_state(rdata)); | |
76f6804e AJ |
527 | if (IS_ERR(fp)) |
528 | goto err; | |
42e9a92f RL |
529 | goto out; |
530 | } | |
531 | ||
76f6804e | 532 | if (IS_ERR(fp)) { |
9fb9d328 | 533 | fc_rport_error_retry(rdata, fp); |
76f6804e AJ |
534 | goto err; |
535 | } | |
536 | ||
42e9a92f RL |
537 | op = fc_frame_payload_op(fp); |
538 | if (op == ELS_LS_ACC && | |
539 | (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) { | |
f211fa51 JE |
540 | rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn); |
541 | rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn); | |
42e9a92f RL |
542 | |
543 | tov = ntohl(plp->fl_csp.sp_e_d_tov); | |
544 | if (ntohs(plp->fl_csp.sp_features) & FC_SP_FT_EDTR) | |
545 | tov /= 1000; | |
546 | if (tov > rdata->e_d_tov) | |
547 | rdata->e_d_tov = tov; | |
548 | csp_seq = ntohs(plp->fl_csp.sp_tot_seq); | |
549 | cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq); | |
550 | if (cssp_seq < csp_seq) | |
551 | csp_seq = cssp_seq; | |
552 | rdata->max_seq = csp_seq; | |
f211fa51 | 553 | rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs); |
42e9a92f RL |
554 | |
555 | /* | |
556 | * If the rport is one of the well known addresses | |
557 | * we skip PRLI and RTV and go straight to READY. | |
558 | */ | |
f211fa51 | 559 | if (rdata->ids.port_id >= FC_FID_DOM_MGR) |
9fb9d328 | 560 | fc_rport_enter_ready(rdata); |
42e9a92f | 561 | else |
9fb9d328 | 562 | fc_rport_enter_prli(rdata); |
42e9a92f | 563 | } else |
9fb9d328 | 564 | fc_rport_error_retry(rdata, fp); |
42e9a92f RL |
565 | |
566 | out: | |
567 | fc_frame_free(fp); | |
568 | err: | |
569 | mutex_unlock(&rdata->rp_mutex); | |
f211fa51 | 570 | kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); |
42e9a92f RL |
571 | } |
572 | ||
573 | /** | |
34f42a07 | 574 | * fc_rport_enter_plogi() - Send Port Login (PLOGI) request to peer |
9fb9d328 | 575 | * @rdata: private remote port data |
42e9a92f RL |
576 | * |
577 | * Locking Note: The rport lock is expected to be held before calling | |
578 | * this routine. | |
579 | */ | |
9fb9d328 | 580 | static void fc_rport_enter_plogi(struct fc_rport_priv *rdata) |
42e9a92f | 581 | { |
42e9a92f RL |
582 | struct fc_lport *lport = rdata->local_port; |
583 | struct fc_frame *fp; | |
584 | ||
9fb9d328 JE |
585 | FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n", |
586 | fc_rport_state(rdata)); | |
42e9a92f | 587 | |
9fb9d328 | 588 | fc_rport_state_enter(rdata, RPORT_ST_PLOGI); |
42e9a92f | 589 | |
f211fa51 | 590 | rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; |
42e9a92f RL |
591 | fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); |
592 | if (!fp) { | |
9fb9d328 | 593 | fc_rport_error_retry(rdata, fp); |
42e9a92f RL |
594 | return; |
595 | } | |
596 | rdata->e_d_tov = lport->e_d_tov; | |
597 | ||
f211fa51 | 598 | if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI, |
9fb9d328 JE |
599 | fc_rport_plogi_resp, rdata, lport->e_d_tov)) |
600 | fc_rport_error_retry(rdata, fp); | |
42e9a92f | 601 | else |
f211fa51 | 602 | kref_get(&rdata->kref); |
42e9a92f RL |
603 | } |
604 | ||
605 | /** | |
34f42a07 | 606 | * fc_rport_prli_resp() - Process Login (PRLI) response handler |
42e9a92f RL |
607 | * @sp: current sequence in the PRLI exchange |
608 | * @fp: response frame | |
9fb9d328 | 609 | * @rdata_arg: private remote port data |
42e9a92f RL |
610 | * |
611 | * Locking Note: This function will be called without the rport lock | |
612 | * held, but it will lock, call an _enter_* function or fc_rport_error | |
613 | * and then unlock the rport. | |
614 | */ | |
615 | static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp, | |
9fb9d328 | 616 | void *rdata_arg) |
42e9a92f | 617 | { |
9fb9d328 | 618 | struct fc_rport_priv *rdata = rdata_arg; |
42e9a92f RL |
619 | struct { |
620 | struct fc_els_prli prli; | |
621 | struct fc_els_spp spp; | |
622 | } *pp; | |
623 | u32 roles = FC_RPORT_ROLE_UNKNOWN; | |
624 | u32 fcp_parm = 0; | |
625 | u8 op; | |
626 | ||
627 | mutex_lock(&rdata->rp_mutex); | |
628 | ||
9fb9d328 | 629 | FC_RPORT_DBG(rdata, "Received a PRLI response\n"); |
42e9a92f RL |
630 | |
631 | if (rdata->rp_state != RPORT_ST_PRLI) { | |
9fb9d328 JE |
632 | FC_RPORT_DBG(rdata, "Received a PRLI response, but in state " |
633 | "%s\n", fc_rport_state(rdata)); | |
76f6804e AJ |
634 | if (IS_ERR(fp)) |
635 | goto err; | |
42e9a92f RL |
636 | goto out; |
637 | } | |
638 | ||
76f6804e | 639 | if (IS_ERR(fp)) { |
9fb9d328 | 640 | fc_rport_error_retry(rdata, fp); |
76f6804e AJ |
641 | goto err; |
642 | } | |
643 | ||
42e9a92f RL |
644 | op = fc_frame_payload_op(fp); |
645 | if (op == ELS_LS_ACC) { | |
646 | pp = fc_frame_payload_get(fp, sizeof(*pp)); | |
647 | if (pp && pp->prli.prli_spp_len >= sizeof(pp->spp)) { | |
648 | fcp_parm = ntohl(pp->spp.spp_params); | |
649 | if (fcp_parm & FCP_SPPF_RETRY) | |
650 | rdata->flags |= FC_RP_FLAGS_RETRY; | |
651 | } | |
652 | ||
f211fa51 | 653 | rdata->supported_classes = FC_COS_CLASS3; |
42e9a92f RL |
654 | if (fcp_parm & FCP_SPPF_INIT_FCN) |
655 | roles |= FC_RPORT_ROLE_FCP_INITIATOR; | |
656 | if (fcp_parm & FCP_SPPF_TARG_FCN) | |
657 | roles |= FC_RPORT_ROLE_FCP_TARGET; | |
658 | ||
f211fa51 | 659 | rdata->ids.roles = roles; |
9fb9d328 | 660 | fc_rport_enter_rtv(rdata); |
42e9a92f RL |
661 | |
662 | } else { | |
9fb9d328 JE |
663 | FC_RPORT_DBG(rdata, "Bad ELS response for PRLI command\n"); |
664 | fc_rport_enter_delete(rdata, RPORT_EV_FAILED); | |
42e9a92f RL |
665 | } |
666 | ||
667 | out: | |
668 | fc_frame_free(fp); | |
669 | err: | |
670 | mutex_unlock(&rdata->rp_mutex); | |
f211fa51 | 671 | kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); |
42e9a92f RL |
672 | } |
673 | ||
674 | /** | |
34f42a07 | 675 | * fc_rport_logo_resp() - Logout (LOGO) response handler |
42e9a92f RL |
676 | * @sp: current sequence in the LOGO exchange |
677 | * @fp: response frame | |
9fb9d328 | 678 | * @rdata_arg: private remote port data |
42e9a92f RL |
679 | * |
680 | * Locking Note: This function will be called without the rport lock | |
681 | * held, but it will lock, call an _enter_* function or fc_rport_error | |
682 | * and then unlock the rport. | |
683 | */ | |
684 | static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, | |
9fb9d328 | 685 | void *rdata_arg) |
42e9a92f | 686 | { |
9fb9d328 | 687 | struct fc_rport_priv *rdata = rdata_arg; |
42e9a92f RL |
688 | u8 op; |
689 | ||
690 | mutex_lock(&rdata->rp_mutex); | |
691 | ||
9fb9d328 | 692 | FC_RPORT_DBG(rdata, "Received a LOGO response\n"); |
42e9a92f | 693 | |
42e9a92f | 694 | if (rdata->rp_state != RPORT_ST_LOGO) { |
9fb9d328 JE |
695 | FC_RPORT_DBG(rdata, "Received a LOGO response, but in state " |
696 | "%s\n", fc_rport_state(rdata)); | |
76f6804e AJ |
697 | if (IS_ERR(fp)) |
698 | goto err; | |
42e9a92f RL |
699 | goto out; |
700 | } | |
701 | ||
76f6804e | 702 | if (IS_ERR(fp)) { |
9fb9d328 | 703 | fc_rport_error_retry(rdata, fp); |
76f6804e AJ |
704 | goto err; |
705 | } | |
706 | ||
42e9a92f RL |
707 | op = fc_frame_payload_op(fp); |
708 | if (op == ELS_LS_ACC) { | |
9fb9d328 | 709 | fc_rport_enter_rtv(rdata); |
42e9a92f | 710 | } else { |
9fb9d328 JE |
711 | FC_RPORT_DBG(rdata, "Bad ELS response for LOGO command\n"); |
712 | fc_rport_enter_delete(rdata, RPORT_EV_LOGO); | |
42e9a92f RL |
713 | } |
714 | ||
715 | out: | |
716 | fc_frame_free(fp); | |
717 | err: | |
718 | mutex_unlock(&rdata->rp_mutex); | |
f211fa51 | 719 | kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); |
42e9a92f RL |
720 | } |
721 | ||
722 | /** | |
34f42a07 | 723 | * fc_rport_enter_prli() - Send Process Login (PRLI) request to peer |
9fb9d328 | 724 | * @rdata: private remote port data |
42e9a92f RL |
725 | * |
726 | * Locking Note: The rport lock is expected to be held before calling | |
727 | * this routine. | |
728 | */ | |
9fb9d328 | 729 | static void fc_rport_enter_prli(struct fc_rport_priv *rdata) |
42e9a92f | 730 | { |
42e9a92f RL |
731 | struct fc_lport *lport = rdata->local_port; |
732 | struct { | |
733 | struct fc_els_prli prli; | |
734 | struct fc_els_spp spp; | |
735 | } *pp; | |
736 | struct fc_frame *fp; | |
737 | ||
9fb9d328 JE |
738 | FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n", |
739 | fc_rport_state(rdata)); | |
42e9a92f | 740 | |
9fb9d328 | 741 | fc_rport_state_enter(rdata, RPORT_ST_PRLI); |
42e9a92f RL |
742 | |
743 | fp = fc_frame_alloc(lport, sizeof(*pp)); | |
744 | if (!fp) { | |
9fb9d328 | 745 | fc_rport_error_retry(rdata, fp); |
42e9a92f RL |
746 | return; |
747 | } | |
748 | ||
f211fa51 | 749 | if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PRLI, |
9fb9d328 JE |
750 | fc_rport_prli_resp, rdata, lport->e_d_tov)) |
751 | fc_rport_error_retry(rdata, fp); | |
42e9a92f | 752 | else |
f211fa51 | 753 | kref_get(&rdata->kref); |
42e9a92f RL |
754 | } |
755 | ||
756 | /** | |
34f42a07 | 757 | * fc_rport_els_rtv_resp() - Request Timeout Value response handler |
42e9a92f RL |
758 | * @sp: current sequence in the RTV exchange |
759 | * @fp: response frame | |
9fb9d328 | 760 | * @rdata_arg: private remote port data |
42e9a92f RL |
761 | * |
762 | * Many targets don't seem to support this. | |
763 | * | |
764 | * Locking Note: This function will be called without the rport lock | |
765 | * held, but it will lock, call an _enter_* function or fc_rport_error | |
766 | * and then unlock the rport. | |
767 | */ | |
768 | static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp, | |
9fb9d328 | 769 | void *rdata_arg) |
42e9a92f | 770 | { |
9fb9d328 | 771 | struct fc_rport_priv *rdata = rdata_arg; |
42e9a92f RL |
772 | u8 op; |
773 | ||
774 | mutex_lock(&rdata->rp_mutex); | |
775 | ||
9fb9d328 | 776 | FC_RPORT_DBG(rdata, "Received a RTV response\n"); |
42e9a92f RL |
777 | |
778 | if (rdata->rp_state != RPORT_ST_RTV) { | |
9fb9d328 JE |
779 | FC_RPORT_DBG(rdata, "Received a RTV response, but in state " |
780 | "%s\n", fc_rport_state(rdata)); | |
76f6804e AJ |
781 | if (IS_ERR(fp)) |
782 | goto err; | |
42e9a92f RL |
783 | goto out; |
784 | } | |
785 | ||
76f6804e | 786 | if (IS_ERR(fp)) { |
9fb9d328 | 787 | fc_rport_error(rdata, fp); |
76f6804e AJ |
788 | goto err; |
789 | } | |
790 | ||
42e9a92f RL |
791 | op = fc_frame_payload_op(fp); |
792 | if (op == ELS_LS_ACC) { | |
793 | struct fc_els_rtv_acc *rtv; | |
794 | u32 toq; | |
795 | u32 tov; | |
796 | ||
797 | rtv = fc_frame_payload_get(fp, sizeof(*rtv)); | |
798 | if (rtv) { | |
799 | toq = ntohl(rtv->rtv_toq); | |
800 | tov = ntohl(rtv->rtv_r_a_tov); | |
801 | if (tov == 0) | |
802 | tov = 1; | |
803 | rdata->r_a_tov = tov; | |
804 | tov = ntohl(rtv->rtv_e_d_tov); | |
805 | if (toq & FC_ELS_RTV_EDRES) | |
806 | tov /= 1000000; | |
807 | if (tov == 0) | |
808 | tov = 1; | |
809 | rdata->e_d_tov = tov; | |
810 | } | |
811 | } | |
812 | ||
9fb9d328 | 813 | fc_rport_enter_ready(rdata); |
42e9a92f RL |
814 | |
815 | out: | |
816 | fc_frame_free(fp); | |
817 | err: | |
818 | mutex_unlock(&rdata->rp_mutex); | |
f211fa51 | 819 | kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); |
42e9a92f RL |
820 | } |
821 | ||
822 | /** | |
34f42a07 | 823 | * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request to peer |
9fb9d328 | 824 | * @rdata: private remote port data |
42e9a92f RL |
825 | * |
826 | * Locking Note: The rport lock is expected to be held before calling | |
827 | * this routine. | |
828 | */ | |
9fb9d328 | 829 | static void fc_rport_enter_rtv(struct fc_rport_priv *rdata) |
42e9a92f RL |
830 | { |
831 | struct fc_frame *fp; | |
42e9a92f RL |
832 | struct fc_lport *lport = rdata->local_port; |
833 | ||
9fb9d328 JE |
834 | FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n", |
835 | fc_rport_state(rdata)); | |
42e9a92f | 836 | |
9fb9d328 | 837 | fc_rport_state_enter(rdata, RPORT_ST_RTV); |
42e9a92f RL |
838 | |
839 | fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv)); | |
840 | if (!fp) { | |
9fb9d328 | 841 | fc_rport_error_retry(rdata, fp); |
42e9a92f RL |
842 | return; |
843 | } | |
844 | ||
f211fa51 | 845 | if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV, |
9fb9d328 JE |
846 | fc_rport_rtv_resp, rdata, lport->e_d_tov)) |
847 | fc_rport_error_retry(rdata, fp); | |
42e9a92f | 848 | else |
f211fa51 | 849 | kref_get(&rdata->kref); |
42e9a92f RL |
850 | } |
851 | ||
852 | /** | |
34f42a07 | 853 | * fc_rport_enter_logo() - Send Logout (LOGO) request to peer |
9fb9d328 | 854 | * @rdata: private remote port data |
42e9a92f RL |
855 | * |
856 | * Locking Note: The rport lock is expected to be held before calling | |
857 | * this routine. | |
858 | */ | |
9fb9d328 | 859 | static void fc_rport_enter_logo(struct fc_rport_priv *rdata) |
42e9a92f | 860 | { |
42e9a92f RL |
861 | struct fc_lport *lport = rdata->local_port; |
862 | struct fc_frame *fp; | |
863 | ||
9fb9d328 JE |
864 | FC_RPORT_DBG(rdata, "Port entered LOGO state from %s state\n", |
865 | fc_rport_state(rdata)); | |
42e9a92f | 866 | |
9fb9d328 | 867 | fc_rport_state_enter(rdata, RPORT_ST_LOGO); |
42e9a92f RL |
868 | |
869 | fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo)); | |
870 | if (!fp) { | |
9fb9d328 | 871 | fc_rport_error_retry(rdata, fp); |
42e9a92f RL |
872 | return; |
873 | } | |
874 | ||
f211fa51 | 875 | if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO, |
9fb9d328 JE |
876 | fc_rport_logo_resp, rdata, lport->e_d_tov)) |
877 | fc_rport_error_retry(rdata, fp); | |
42e9a92f | 878 | else |
f211fa51 | 879 | kref_get(&rdata->kref); |
42e9a92f RL |
880 | } |
881 | ||
882 | ||
883 | /** | |
34f42a07 | 884 | * fc_rport_recv_req() - Receive a request from a rport |
42e9a92f RL |
885 | * @sp: current sequence in the PLOGI exchange |
886 | * @fp: response frame | |
9fb9d328 | 887 | * @rdata_arg: private remote port data |
42e9a92f RL |
888 | * |
889 | * Locking Note: Called without the rport lock held. This | |
890 | * function will hold the rport lock, call an _enter_* | |
891 | * function and then unlock the rport. | |
892 | */ | |
893 | void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp, | |
9fb9d328 | 894 | struct fc_rport_priv *rdata) |
42e9a92f | 895 | { |
42e9a92f RL |
896 | struct fc_lport *lport = rdata->local_port; |
897 | ||
898 | struct fc_frame_header *fh; | |
899 | struct fc_seq_els_data els_data; | |
900 | u8 op; | |
901 | ||
902 | mutex_lock(&rdata->rp_mutex); | |
903 | ||
904 | els_data.fp = NULL; | |
905 | els_data.explan = ELS_EXPL_NONE; | |
906 | els_data.reason = ELS_RJT_NONE; | |
907 | ||
908 | fh = fc_frame_header_get(fp); | |
909 | ||
910 | if (fh->fh_r_ctl == FC_RCTL_ELS_REQ && fh->fh_type == FC_TYPE_ELS) { | |
911 | op = fc_frame_payload_op(fp); | |
912 | switch (op) { | |
913 | case ELS_PLOGI: | |
9fb9d328 | 914 | fc_rport_recv_plogi_req(rdata, sp, fp); |
42e9a92f RL |
915 | break; |
916 | case ELS_PRLI: | |
9fb9d328 | 917 | fc_rport_recv_prli_req(rdata, sp, fp); |
42e9a92f RL |
918 | break; |
919 | case ELS_PRLO: | |
9fb9d328 | 920 | fc_rport_recv_prlo_req(rdata, sp, fp); |
42e9a92f RL |
921 | break; |
922 | case ELS_LOGO: | |
9fb9d328 | 923 | fc_rport_recv_logo_req(rdata, sp, fp); |
42e9a92f RL |
924 | break; |
925 | case ELS_RRQ: | |
926 | els_data.fp = fp; | |
927 | lport->tt.seq_els_rsp_send(sp, ELS_RRQ, &els_data); | |
928 | break; | |
929 | case ELS_REC: | |
930 | els_data.fp = fp; | |
931 | lport->tt.seq_els_rsp_send(sp, ELS_REC, &els_data); | |
932 | break; | |
933 | default: | |
934 | els_data.reason = ELS_RJT_UNSUP; | |
935 | lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data); | |
936 | break; | |
937 | } | |
938 | } | |
939 | ||
940 | mutex_unlock(&rdata->rp_mutex); | |
941 | } | |
942 | ||
943 | /** | |
34f42a07 | 944 | * fc_rport_recv_plogi_req() - Handle incoming Port Login (PLOGI) request |
9fb9d328 | 945 | * @rdata: private remote port data |
42e9a92f RL |
946 | * @sp: current sequence in the PLOGI exchange |
947 | * @fp: PLOGI request frame | |
948 | * | |
949 | * Locking Note: The rport lock is exected to be held before calling | |
950 | * this function. | |
951 | */ | |
9fb9d328 | 952 | static void fc_rport_recv_plogi_req(struct fc_rport_priv *rdata, |
42e9a92f RL |
953 | struct fc_seq *sp, struct fc_frame *rx_fp) |
954 | { | |
42e9a92f RL |
955 | struct fc_lport *lport = rdata->local_port; |
956 | struct fc_frame *fp = rx_fp; | |
957 | struct fc_exch *ep; | |
958 | struct fc_frame_header *fh; | |
959 | struct fc_els_flogi *pl; | |
960 | struct fc_seq_els_data rjt_data; | |
961 | u32 sid; | |
962 | u64 wwpn; | |
963 | u64 wwnn; | |
964 | enum fc_els_rjt_reason reject = 0; | |
965 | u32 f_ctl; | |
966 | rjt_data.fp = NULL; | |
967 | ||
968 | fh = fc_frame_header_get(fp); | |
969 | ||
9fb9d328 JE |
970 | FC_RPORT_DBG(rdata, "Received PLOGI request while in state %s\n", |
971 | fc_rport_state(rdata)); | |
42e9a92f RL |
972 | |
973 | sid = ntoh24(fh->fh_s_id); | |
974 | pl = fc_frame_payload_get(fp, sizeof(*pl)); | |
975 | if (!pl) { | |
9fb9d328 | 976 | FC_RPORT_DBG(rdata, "Received PLOGI too short\n"); |
42e9a92f RL |
977 | WARN_ON(1); |
978 | /* XXX TBD: send reject? */ | |
979 | fc_frame_free(fp); | |
980 | return; | |
981 | } | |
982 | wwpn = get_unaligned_be64(&pl->fl_wwpn); | |
983 | wwnn = get_unaligned_be64(&pl->fl_wwnn); | |
984 | ||
985 | /* | |
986 | * If the session was just created, possibly due to the incoming PLOGI, | |
987 | * set the state appropriately and accept the PLOGI. | |
988 | * | |
989 | * If we had also sent a PLOGI, and if the received PLOGI is from a | |
990 | * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason | |
991 | * "command already in progress". | |
992 | * | |
993 | * XXX TBD: If the session was ready before, the PLOGI should result in | |
994 | * all outstanding exchanges being reset. | |
995 | */ | |
996 | switch (rdata->rp_state) { | |
997 | case RPORT_ST_INIT: | |
9fb9d328 | 998 | FC_RPORT_DBG(rdata, "Received PLOGI, wwpn %llx state INIT " |
7414705e | 999 | "- reject\n", (unsigned long long)wwpn); |
42e9a92f RL |
1000 | reject = ELS_RJT_UNSUP; |
1001 | break; | |
1002 | case RPORT_ST_PLOGI: | |
9fb9d328 | 1003 | FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state %d\n", |
7414705e | 1004 | rdata->rp_state); |
42e9a92f RL |
1005 | if (wwpn < lport->wwpn) |
1006 | reject = ELS_RJT_INPROG; | |
1007 | break; | |
1008 | case RPORT_ST_PRLI: | |
1009 | case RPORT_ST_READY: | |
9fb9d328 | 1010 | FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d " |
7414705e | 1011 | "- ignored for now\n", rdata->rp_state); |
42e9a92f RL |
1012 | /* XXX TBD - should reset */ |
1013 | break; | |
14194054 | 1014 | case RPORT_ST_DELETE: |
42e9a92f | 1015 | default: |
9fb9d328 | 1016 | FC_RPORT_DBG(rdata, "Received PLOGI in unexpected " |
7414705e | 1017 | "state %d\n", rdata->rp_state); |
b4c6f546 AJ |
1018 | fc_frame_free(fp); |
1019 | return; | |
42e9a92f RL |
1020 | break; |
1021 | } | |
1022 | ||
1023 | if (reject) { | |
1024 | rjt_data.reason = reject; | |
1025 | rjt_data.explan = ELS_EXPL_NONE; | |
1026 | lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); | |
1027 | fc_frame_free(fp); | |
1028 | } else { | |
1029 | fp = fc_frame_alloc(lport, sizeof(*pl)); | |
1030 | if (fp == NULL) { | |
1031 | fp = rx_fp; | |
1032 | rjt_data.reason = ELS_RJT_UNAB; | |
1033 | rjt_data.explan = ELS_EXPL_NONE; | |
1034 | lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); | |
1035 | fc_frame_free(fp); | |
1036 | } else { | |
1037 | sp = lport->tt.seq_start_next(sp); | |
1038 | WARN_ON(!sp); | |
f211fa51 JE |
1039 | rdata->ids.port_name = wwpn; |
1040 | rdata->ids.node_name = wwnn; | |
42e9a92f RL |
1041 | |
1042 | /* | |
1043 | * Get session payload size from incoming PLOGI. | |
1044 | */ | |
f211fa51 | 1045 | rdata->maxframe_size = |
42e9a92f RL |
1046 | fc_plogi_get_maxframe(pl, lport->mfs); |
1047 | fc_frame_free(rx_fp); | |
1048 | fc_plogi_fill(lport, fp, ELS_LS_ACC); | |
1049 | ||
1050 | /* | |
1051 | * Send LS_ACC. If this fails, | |
1052 | * the originator should retry. | |
1053 | */ | |
1054 | f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ; | |
1055 | f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
1056 | ep = fc_seq_exch(sp); | |
1057 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, | |
1058 | FC_TYPE_ELS, f_ctl, 0); | |
1059 | lport->tt.seq_send(lport, sp, fp); | |
1060 | if (rdata->rp_state == RPORT_ST_PLOGI) | |
9fb9d328 | 1061 | fc_rport_enter_prli(rdata); |
42e9a92f RL |
1062 | } |
1063 | } | |
1064 | } | |
1065 | ||
1066 | /** | |
34f42a07 | 1067 | * fc_rport_recv_prli_req() - Handle incoming Process Login (PRLI) request |
9fb9d328 | 1068 | * @rdata: private remote port data |
42e9a92f RL |
1069 | * @sp: current sequence in the PRLI exchange |
1070 | * @fp: PRLI request frame | |
1071 | * | |
1072 | * Locking Note: The rport lock is exected to be held before calling | |
1073 | * this function. | |
1074 | */ | |
9fb9d328 | 1075 | static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata, |
42e9a92f RL |
1076 | struct fc_seq *sp, struct fc_frame *rx_fp) |
1077 | { | |
42e9a92f RL |
1078 | struct fc_lport *lport = rdata->local_port; |
1079 | struct fc_exch *ep; | |
1080 | struct fc_frame *fp; | |
1081 | struct fc_frame_header *fh; | |
1082 | struct { | |
1083 | struct fc_els_prli prli; | |
1084 | struct fc_els_spp spp; | |
1085 | } *pp; | |
1086 | struct fc_els_spp *rspp; /* request service param page */ | |
1087 | struct fc_els_spp *spp; /* response spp */ | |
1088 | unsigned int len; | |
1089 | unsigned int plen; | |
1090 | enum fc_els_rjt_reason reason = ELS_RJT_UNAB; | |
1091 | enum fc_els_rjt_explan explan = ELS_EXPL_NONE; | |
1092 | enum fc_els_spp_resp resp; | |
1093 | struct fc_seq_els_data rjt_data; | |
1094 | u32 f_ctl; | |
1095 | u32 fcp_parm; | |
1096 | u32 roles = FC_RPORT_ROLE_UNKNOWN; | |
1097 | rjt_data.fp = NULL; | |
1098 | ||
1099 | fh = fc_frame_header_get(rx_fp); | |
1100 | ||
9fb9d328 JE |
1101 | FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n", |
1102 | fc_rport_state(rdata)); | |
42e9a92f RL |
1103 | |
1104 | switch (rdata->rp_state) { | |
1105 | case RPORT_ST_PRLI: | |
1106 | case RPORT_ST_READY: | |
1107 | reason = ELS_RJT_NONE; | |
1108 | break; | |
1109 | default: | |
b4c6f546 AJ |
1110 | fc_frame_free(rx_fp); |
1111 | return; | |
42e9a92f RL |
1112 | break; |
1113 | } | |
1114 | len = fr_len(rx_fp) - sizeof(*fh); | |
1115 | pp = fc_frame_payload_get(rx_fp, sizeof(*pp)); | |
1116 | if (pp == NULL) { | |
1117 | reason = ELS_RJT_PROT; | |
1118 | explan = ELS_EXPL_INV_LEN; | |
1119 | } else { | |
1120 | plen = ntohs(pp->prli.prli_len); | |
1121 | if ((plen % 4) != 0 || plen > len) { | |
1122 | reason = ELS_RJT_PROT; | |
1123 | explan = ELS_EXPL_INV_LEN; | |
1124 | } else if (plen < len) { | |
1125 | len = plen; | |
1126 | } | |
1127 | plen = pp->prli.prli_spp_len; | |
1128 | if ((plen % 4) != 0 || plen < sizeof(*spp) || | |
1129 | plen > len || len < sizeof(*pp)) { | |
1130 | reason = ELS_RJT_PROT; | |
1131 | explan = ELS_EXPL_INV_LEN; | |
1132 | } | |
1133 | rspp = &pp->spp; | |
1134 | } | |
1135 | if (reason != ELS_RJT_NONE || | |
1136 | (fp = fc_frame_alloc(lport, len)) == NULL) { | |
1137 | rjt_data.reason = reason; | |
1138 | rjt_data.explan = explan; | |
1139 | lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); | |
1140 | } else { | |
1141 | sp = lport->tt.seq_start_next(sp); | |
1142 | WARN_ON(!sp); | |
1143 | pp = fc_frame_payload_get(fp, len); | |
1144 | WARN_ON(!pp); | |
1145 | memset(pp, 0, len); | |
1146 | pp->prli.prli_cmd = ELS_LS_ACC; | |
1147 | pp->prli.prli_spp_len = plen; | |
1148 | pp->prli.prli_len = htons(len); | |
1149 | len -= sizeof(struct fc_els_prli); | |
1150 | ||
1151 | /* | |
1152 | * Go through all the service parameter pages and build | |
1153 | * response. If plen indicates longer SPP than standard, | |
1154 | * use that. The entire response has been pre-cleared above. | |
1155 | */ | |
1156 | spp = &pp->spp; | |
1157 | while (len >= plen) { | |
1158 | spp->spp_type = rspp->spp_type; | |
1159 | spp->spp_type_ext = rspp->spp_type_ext; | |
1160 | spp->spp_flags = rspp->spp_flags & FC_SPP_EST_IMG_PAIR; | |
1161 | resp = FC_SPP_RESP_ACK; | |
1162 | if (rspp->spp_flags & FC_SPP_RPA_VAL) | |
1163 | resp = FC_SPP_RESP_NO_PA; | |
1164 | switch (rspp->spp_type) { | |
1165 | case 0: /* common to all FC-4 types */ | |
1166 | break; | |
1167 | case FC_TYPE_FCP: | |
1168 | fcp_parm = ntohl(rspp->spp_params); | |
1169 | if (fcp_parm * FCP_SPPF_RETRY) | |
1170 | rdata->flags |= FC_RP_FLAGS_RETRY; | |
f211fa51 | 1171 | rdata->supported_classes = FC_COS_CLASS3; |
42e9a92f RL |
1172 | if (fcp_parm & FCP_SPPF_INIT_FCN) |
1173 | roles |= FC_RPORT_ROLE_FCP_INITIATOR; | |
1174 | if (fcp_parm & FCP_SPPF_TARG_FCN) | |
1175 | roles |= FC_RPORT_ROLE_FCP_TARGET; | |
f211fa51 | 1176 | rdata->ids.roles = roles; |
42e9a92f RL |
1177 | |
1178 | spp->spp_params = | |
1179 | htonl(lport->service_params); | |
1180 | break; | |
1181 | default: | |
1182 | resp = FC_SPP_RESP_INVL; | |
1183 | break; | |
1184 | } | |
1185 | spp->spp_flags |= resp; | |
1186 | len -= plen; | |
1187 | rspp = (struct fc_els_spp *)((char *)rspp + plen); | |
1188 | spp = (struct fc_els_spp *)((char *)spp + plen); | |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * Send LS_ACC. If this fails, the originator should retry. | |
1193 | */ | |
1194 | f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ; | |
1195 | f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT; | |
1196 | ep = fc_seq_exch(sp); | |
1197 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, | |
1198 | FC_TYPE_ELS, f_ctl, 0); | |
1199 | lport->tt.seq_send(lport, sp, fp); | |
1200 | ||
1201 | /* | |
1202 | * Get lock and re-check state. | |
1203 | */ | |
1204 | switch (rdata->rp_state) { | |
1205 | case RPORT_ST_PRLI: | |
9fb9d328 | 1206 | fc_rport_enter_ready(rdata); |
42e9a92f RL |
1207 | break; |
1208 | case RPORT_ST_READY: | |
1209 | break; | |
1210 | default: | |
1211 | break; | |
1212 | } | |
1213 | } | |
1214 | fc_frame_free(rx_fp); | |
1215 | } | |
1216 | ||
1217 | /** | |
34f42a07 | 1218 | * fc_rport_recv_prlo_req() - Handle incoming Process Logout (PRLO) request |
9fb9d328 | 1219 | * @rdata: private remote port data |
42e9a92f RL |
1220 | * @sp: current sequence in the PRLO exchange |
1221 | * @fp: PRLO request frame | |
1222 | * | |
1223 | * Locking Note: The rport lock is exected to be held before calling | |
1224 | * this function. | |
1225 | */ | |
9fb9d328 JE |
1226 | static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata, |
1227 | struct fc_seq *sp, | |
42e9a92f RL |
1228 | struct fc_frame *fp) |
1229 | { | |
42e9a92f RL |
1230 | struct fc_lport *lport = rdata->local_port; |
1231 | ||
1232 | struct fc_frame_header *fh; | |
1233 | struct fc_seq_els_data rjt_data; | |
1234 | ||
1235 | fh = fc_frame_header_get(fp); | |
1236 | ||
9fb9d328 JE |
1237 | FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n", |
1238 | fc_rport_state(rdata)); | |
42e9a92f | 1239 | |
14194054 | 1240 | if (rdata->rp_state == RPORT_ST_DELETE) { |
b4c6f546 AJ |
1241 | fc_frame_free(fp); |
1242 | return; | |
1243 | } | |
1244 | ||
42e9a92f RL |
1245 | rjt_data.fp = NULL; |
1246 | rjt_data.reason = ELS_RJT_UNAB; | |
1247 | rjt_data.explan = ELS_EXPL_NONE; | |
1248 | lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); | |
1249 | fc_frame_free(fp); | |
1250 | } | |
1251 | ||
1252 | /** | |
34f42a07 | 1253 | * fc_rport_recv_logo_req() - Handle incoming Logout (LOGO) request |
9fb9d328 | 1254 | * @rdata: private remote port data |
42e9a92f RL |
1255 | * @sp: current sequence in the LOGO exchange |
1256 | * @fp: LOGO request frame | |
1257 | * | |
1258 | * Locking Note: The rport lock is exected to be held before calling | |
1259 | * this function. | |
1260 | */ | |
9fb9d328 JE |
1261 | static void fc_rport_recv_logo_req(struct fc_rport_priv *rdata, |
1262 | struct fc_seq *sp, | |
42e9a92f RL |
1263 | struct fc_frame *fp) |
1264 | { | |
1265 | struct fc_frame_header *fh; | |
42e9a92f RL |
1266 | struct fc_lport *lport = rdata->local_port; |
1267 | ||
1268 | fh = fc_frame_header_get(fp); | |
1269 | ||
9fb9d328 JE |
1270 | FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n", |
1271 | fc_rport_state(rdata)); | |
42e9a92f | 1272 | |
14194054 | 1273 | if (rdata->rp_state == RPORT_ST_DELETE) { |
b4c6f546 AJ |
1274 | fc_frame_free(fp); |
1275 | return; | |
1276 | } | |
1277 | ||
00fea930 | 1278 | fc_rport_enter_delete(rdata, RPORT_EV_LOGO); |
42e9a92f RL |
1279 | |
1280 | lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); | |
1281 | fc_frame_free(fp); | |
1282 | } | |
1283 | ||
1284 | static void fc_rport_flush_queue(void) | |
1285 | { | |
1286 | flush_workqueue(rport_event_queue); | |
1287 | } | |
1288 | ||
42e9a92f RL |
1289 | int fc_rport_init(struct fc_lport *lport) |
1290 | { | |
5101ff99 | 1291 | if (!lport->tt.rport_create) |
9e9d0452 | 1292 | lport->tt.rport_create = fc_rport_create; |
5101ff99 | 1293 | |
42e9a92f RL |
1294 | if (!lport->tt.rport_login) |
1295 | lport->tt.rport_login = fc_rport_login; | |
1296 | ||
1297 | if (!lport->tt.rport_logoff) | |
1298 | lport->tt.rport_logoff = fc_rport_logoff; | |
1299 | ||
1300 | if (!lport->tt.rport_recv_req) | |
1301 | lport->tt.rport_recv_req = fc_rport_recv_req; | |
1302 | ||
1303 | if (!lport->tt.rport_flush_queue) | |
1304 | lport->tt.rport_flush_queue = fc_rport_flush_queue; | |
1305 | ||
f211fa51 JE |
1306 | if (!lport->tt.rport_destroy) |
1307 | lport->tt.rport_destroy = fc_rport_destroy; | |
1308 | ||
42e9a92f RL |
1309 | return 0; |
1310 | } | |
1311 | EXPORT_SYMBOL(fc_rport_init); | |
1312 | ||
b0d428ad | 1313 | int fc_setup_rport(void) |
42e9a92f RL |
1314 | { |
1315 | rport_event_queue = create_singlethread_workqueue("fc_rport_eq"); | |
1316 | if (!rport_event_queue) | |
1317 | return -ENOMEM; | |
1318 | return 0; | |
1319 | } | |
1320 | EXPORT_SYMBOL(fc_setup_rport); | |
1321 | ||
b0d428ad | 1322 | void fc_destroy_rport(void) |
42e9a92f RL |
1323 | { |
1324 | destroy_workqueue(rport_event_queue); | |
1325 | } | |
1326 | EXPORT_SYMBOL(fc_destroy_rport); | |
1327 | ||
1328 | void fc_rport_terminate_io(struct fc_rport *rport) | |
1329 | { | |
ab28f1fd JE |
1330 | struct fc_rport_libfc_priv *rp = rport->dd_data; |
1331 | struct fc_lport *lport = rp->local_port; | |
42e9a92f | 1332 | |
1f6ff364 AJ |
1333 | lport->tt.exch_mgr_reset(lport, 0, rport->port_id); |
1334 | lport->tt.exch_mgr_reset(lport, rport->port_id, 0); | |
42e9a92f RL |
1335 | } |
1336 | EXPORT_SYMBOL(fc_rport_terminate_io); |