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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / scsi / bnx2fc / bnx2fc_io.c
blobed880891cb7c4b7c038ee73aac032b77108377d4
1 /* bnx2fc_io.c: Broadcom NetXtreme II Linux FCoE offload driver.
2 * IO manager and SCSI IO processing.
3 *
4 * Copyright (c) 2008 - 2013 Broadcom Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation.
9 *
10 * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
11 */
12
13 #include "bnx2fc.h"
14
15 #define RESERVE_FREE_LIST_INDEX num_possible_cpus()
16
17 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
18 int bd_index);
19 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
20 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
21 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
22 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
23 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
24 struct fcoe_fcp_rsp_payload *fcp_rsp,
25 u8 num_rq);
26
27 void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
28 unsigned int timer_msec)
29 {
30 struct bnx2fc_interface *interface = io_req->port->priv;
31
32 if (queue_delayed_work(interface->timer_work_queue,
33 &io_req->timeout_work,
34 msecs_to_jiffies(timer_msec)))
35 kref_get(&io_req->refcount);
36 }
37
38 static void bnx2fc_cmd_timeout(struct work_struct *work)
39 {
40 struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
41 timeout_work.work);
42 struct fc_lport *lport;
43 struct fc_rport_priv *rdata;
44 u8 cmd_type = io_req->cmd_type;
45 struct bnx2fc_rport *tgt = io_req->tgt;
46 int logo_issued;
47 int rc;
48
49 BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
50 "req_flags = %lx\n", cmd_type, io_req->req_flags);
51
52 spin_lock_bh(&tgt->tgt_lock);
53 if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
54 clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
55 /*
56 * ideally we should hold the io_req until RRQ complets,
57 * and release io_req from timeout hold.
58 */
59 spin_unlock_bh(&tgt->tgt_lock);
60 bnx2fc_send_rrq(io_req);
61 return;
62 }
63 if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
64 BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
65 goto done;
66 }
67
68 switch (cmd_type) {
69 case BNX2FC_SCSI_CMD:
70 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
71 &io_req->req_flags)) {
72 /* Handle eh_abort timeout */
73 BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
74 complete(&io_req->tm_done);
75 } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
76 &io_req->req_flags)) {
77 /* Handle internally generated ABTS timeout */
78 BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
79 io_req->refcount.refcount.counter);
80 if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
81 &io_req->req_flags))) {
82
83 lport = io_req->port->lport;
84 rdata = io_req->tgt->rdata;
85 logo_issued = test_and_set_bit(
86 BNX2FC_FLAG_EXPL_LOGO,
87 &tgt->flags);
88 kref_put(&io_req->refcount, bnx2fc_cmd_release);
89 spin_unlock_bh(&tgt->tgt_lock);
90
91 /* Explicitly logo the target */
92 if (!logo_issued) {
93 BNX2FC_IO_DBG(io_req, "Explicit "
94 "logo - tgt flags = 0x%lx\n",
95 tgt->flags);
96
97 mutex_lock(&lport->disc.disc_mutex);
98 lport->tt.rport_logoff(rdata);
99 mutex_unlock(&lport->disc.disc_mutex);
100 }
101 return;
102 }
103 } else {
104 /* Hanlde IO timeout */
105 BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
106 if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
107 &io_req->req_flags)) {
108 BNX2FC_IO_DBG(io_req, "IO completed before "
109 " timer expiry\n");
110 goto done;
111 }
112
113 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
114 &io_req->req_flags)) {
115 rc = bnx2fc_initiate_abts(io_req);
116 if (rc == SUCCESS)
117 goto done;
118 /*
119 * Explicitly logo the target if
120 * abts initiation fails
121 */
122 lport = io_req->port->lport;
123 rdata = io_req->tgt->rdata;
124 logo_issued = test_and_set_bit(
125 BNX2FC_FLAG_EXPL_LOGO,
126 &tgt->flags);
127 kref_put(&io_req->refcount, bnx2fc_cmd_release);
128 spin_unlock_bh(&tgt->tgt_lock);
129
130 if (!logo_issued) {
131 BNX2FC_IO_DBG(io_req, "Explicit "
132 "logo - tgt flags = 0x%lx\n",
133 tgt->flags);
134
135
136 mutex_lock(&lport->disc.disc_mutex);
137 lport->tt.rport_logoff(rdata);
138 mutex_unlock(&lport->disc.disc_mutex);
139 }
140 return;
141 } else {
142 BNX2FC_IO_DBG(io_req, "IO already in "
143 "ABTS processing\n");
144 }
145 }
146 break;
147 case BNX2FC_ELS:
148
149 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
150 BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
151
152 if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
153 &io_req->req_flags)) {
154 lport = io_req->port->lport;
155 rdata = io_req->tgt->rdata;
156 logo_issued = test_and_set_bit(
157 BNX2FC_FLAG_EXPL_LOGO,
158 &tgt->flags);
159 kref_put(&io_req->refcount, bnx2fc_cmd_release);
160 spin_unlock_bh(&tgt->tgt_lock);
161
162 /* Explicitly logo the target */
163 if (!logo_issued) {
164 BNX2FC_IO_DBG(io_req, "Explicitly logo"
165 "(els)\n");
166 mutex_lock(&lport->disc.disc_mutex);
167 lport->tt.rport_logoff(rdata);
168 mutex_unlock(&lport->disc.disc_mutex);
169 }
170 return;
171 }
172 } else {
173 /*
174 * Handle ELS timeout.
175 * tgt_lock is used to sync compl path and timeout
176 * path. If els compl path is processing this IO, we
177 * have nothing to do here, just release the timer hold
178 */
179 BNX2FC_IO_DBG(io_req, "ELS timed out\n");
180 if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
181 &io_req->req_flags))
182 goto done;
183
184 /* Indicate the cb_func that this ELS is timed out */
185 set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
186
187 if ((io_req->cb_func) && (io_req->cb_arg)) {
188 io_req->cb_func(io_req->cb_arg);
189 io_req->cb_arg = NULL;
190 }
191 }
192 break;
193 default:
194 printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
195 cmd_type);
196 break;
197 }
198
199 done:
200 /* release the cmd that was held when timer was set */
201 kref_put(&io_req->refcount, bnx2fc_cmd_release);
202 spin_unlock_bh(&tgt->tgt_lock);
203 }
204
205 static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
206 {
207 /* Called with host lock held */
208 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
209
210 /*
211 * active_cmd_queue may have other command types as well,
212 * and during flush operation, we want to error back only
213 * scsi commands.
214 */
215 if (io_req->cmd_type != BNX2FC_SCSI_CMD)
216 return;
217
218 BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
219 if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
220 /* Do not call scsi done for this IO */
221 return;
222 }
223
224 bnx2fc_unmap_sg_list(io_req);
225 io_req->sc_cmd = NULL;
226 if (!sc_cmd) {
227 printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
228 "IO(0x%x) already cleaned up\n",
229 io_req->xid);
230 return;
231 }
232 sc_cmd->result = err_code << 16;
233
234 BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
235 sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
236 sc_cmd->allowed);
237 scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
238 sc_cmd->SCp.ptr = NULL;
239 sc_cmd->scsi_done(sc_cmd);
240 }
241
242 struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
243 {
244 struct bnx2fc_cmd_mgr *cmgr;
245 struct io_bdt *bdt_info;
246 struct bnx2fc_cmd *io_req;
247 size_t len;
248 u32 mem_size;
249 u16 xid;
250 int i;
251 int num_ios, num_pri_ios;
252 size_t bd_tbl_sz;
253 int arr_sz = num_possible_cpus() + 1;
254 u16 min_xid = BNX2FC_MIN_XID;
255 u16 max_xid = hba->max_xid;
256
257 if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
258 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
259 and max_xid 0x%x\n", min_xid, max_xid);
260 return NULL;
261 }
262 BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
263
264 num_ios = max_xid - min_xid + 1;
265 len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
266 len += sizeof(struct bnx2fc_cmd_mgr);
267
268 cmgr = kzalloc(len, GFP_KERNEL);
269 if (!cmgr) {
270 printk(KERN_ERR PFX "failed to alloc cmgr\n");
271 return NULL;
272 }
273
274 cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
275 arr_sz, GFP_KERNEL);
276 if (!cmgr->free_list) {
277 printk(KERN_ERR PFX "failed to alloc free_list\n");
278 goto mem_err;
279 }
280
281 cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
282 arr_sz, GFP_KERNEL);
283 if (!cmgr->free_list_lock) {
284 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
285 goto mem_err;
286 }
287
288 cmgr->hba = hba;
289 cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
290
291 for (i = 0; i < arr_sz; i++) {
292 INIT_LIST_HEAD(&cmgr->free_list[i]);
293 spin_lock_init(&cmgr->free_list_lock[i]);
294 }
295
296 /*
297 * Pre-allocated pool of bnx2fc_cmds.
298 * Last entry in the free list array is the free list
299 * of slow path requests.
300 */
301 xid = BNX2FC_MIN_XID;
302 num_pri_ios = num_ios - hba->elstm_xids;
303 for (i = 0; i < num_ios; i++) {
304 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
305
306 if (!io_req) {
307 printk(KERN_ERR PFX "failed to alloc io_req\n");
308 goto mem_err;
309 }
310
311 INIT_LIST_HEAD(&io_req->link);
312 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
313
314 io_req->xid = xid++;
315 if (i < num_pri_ios)
316 list_add_tail(&io_req->link,
317 &cmgr->free_list[io_req->xid %
318 num_possible_cpus()]);
319 else
320 list_add_tail(&io_req->link,
321 &cmgr->free_list[num_possible_cpus()]);
322 io_req++;
323 }
324
325 /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
326 mem_size = num_ios * sizeof(struct io_bdt *);
327 cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
328 if (!cmgr->io_bdt_pool) {
329 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
330 goto mem_err;
331 }
332
333 mem_size = sizeof(struct io_bdt);
334 for (i = 0; i < num_ios; i++) {
335 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
336 if (!cmgr->io_bdt_pool[i]) {
337 printk(KERN_ERR PFX "failed to alloc "
338 "io_bdt_pool[%d]\n", i);
339 goto mem_err;
340 }
341 }
342
343 /* Allocate an map fcoe_bdt_ctx structures */
344 bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
345 for (i = 0; i < num_ios; i++) {
346 bdt_info = cmgr->io_bdt_pool[i];
347 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
348 bd_tbl_sz,
349 &bdt_info->bd_tbl_dma,
350 GFP_KERNEL);
351 if (!bdt_info->bd_tbl) {
352 printk(KERN_ERR PFX "failed to alloc "
353 "bdt_tbl[%d]\n", i);
354 goto mem_err;
355 }
356 }
357
358 return cmgr;
359
360 mem_err:
361 bnx2fc_cmd_mgr_free(cmgr);
362 return NULL;
363 }
364
365 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
366 {
367 struct io_bdt *bdt_info;
368 struct bnx2fc_hba *hba = cmgr->hba;
369 size_t bd_tbl_sz;
370 u16 min_xid = BNX2FC_MIN_XID;
371 u16 max_xid = hba->max_xid;
372 int num_ios;
373 int i;
374
375 num_ios = max_xid - min_xid + 1;
376
377 /* Free fcoe_bdt_ctx structures */
378 if (!cmgr->io_bdt_pool)
379 goto free_cmd_pool;
380
381 bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
382 for (i = 0; i < num_ios; i++) {
383 bdt_info = cmgr->io_bdt_pool[i];
384 if (bdt_info->bd_tbl) {
385 dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
386 bdt_info->bd_tbl,
387 bdt_info->bd_tbl_dma);
388 bdt_info->bd_tbl = NULL;
389 }
390 }
391
392 /* Destroy io_bdt pool */
393 for (i = 0; i < num_ios; i++) {
394 kfree(cmgr->io_bdt_pool[i]);
395 cmgr->io_bdt_pool[i] = NULL;
396 }
397
398 kfree(cmgr->io_bdt_pool);
399 cmgr->io_bdt_pool = NULL;
400
401 free_cmd_pool:
402 kfree(cmgr->free_list_lock);
403
404 /* Destroy cmd pool */
405 if (!cmgr->free_list)
406 goto free_cmgr;
407
408 for (i = 0; i < num_possible_cpus() + 1; i++) {
409 struct bnx2fc_cmd *tmp, *io_req;
410
411 list_for_each_entry_safe(io_req, tmp,
412 &cmgr->free_list[i], link) {
413 list_del(&io_req->link);
414 kfree(io_req);
415 }
416 }
417 kfree(cmgr->free_list);
418 free_cmgr:
419 /* Free command manager itself */
420 kfree(cmgr);
421 }
422
423 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
424 {
425 struct fcoe_port *port = tgt->port;
426 struct bnx2fc_interface *interface = port->priv;
427 struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
428 struct bnx2fc_cmd *io_req;
429 struct list_head *listp;
430 struct io_bdt *bd_tbl;
431 int index = RESERVE_FREE_LIST_INDEX;
432 u32 free_sqes;
433 u32 max_sqes;
434 u16 xid;
435
436 max_sqes = tgt->max_sqes;
437 switch (type) {
438 case BNX2FC_TASK_MGMT_CMD:
439 max_sqes = BNX2FC_TM_MAX_SQES;
440 break;
441 case BNX2FC_ELS:
442 max_sqes = BNX2FC_ELS_MAX_SQES;
443 break;
444 default:
445 break;
446 }
447
448 /*
449 * NOTE: Free list insertions and deletions are protected with
450 * cmgr lock
451 */
452 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
453 free_sqes = atomic_read(&tgt->free_sqes);
454 if ((list_empty(&(cmd_mgr->free_list[index]))) ||
455 (tgt->num_active_ios.counter >= max_sqes) ||
456 (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
457 BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
458 "ios(%d):sqes(%d)\n",
459 tgt->num_active_ios.counter, tgt->max_sqes);
460 if (list_empty(&(cmd_mgr->free_list[index])))
461 printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
462 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
463 return NULL;
464 }
465
466 listp = (struct list_head *)
467 cmd_mgr->free_list[index].next;
468 list_del_init(listp);
469 io_req = (struct bnx2fc_cmd *) listp;
470 xid = io_req->xid;
471 cmd_mgr->cmds[xid] = io_req;
472 atomic_inc(&tgt->num_active_ios);
473 atomic_dec(&tgt->free_sqes);
474 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
475
476 INIT_LIST_HEAD(&io_req->link);
477
478 io_req->port = port;
479 io_req->cmd_mgr = cmd_mgr;
480 io_req->req_flags = 0;
481 io_req->cmd_type = type;
482
483 /* Bind io_bdt for this io_req */
484 /* Have a static link between io_req and io_bdt_pool */
485 bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
486 bd_tbl->io_req = io_req;
487
488 /* Hold the io_req against deletion */
489 kref_init(&io_req->refcount);
490 return io_req;
491 }
492
493 struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
494 {
495 struct fcoe_port *port = tgt->port;
496 struct bnx2fc_interface *interface = port->priv;
497 struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
498 struct bnx2fc_cmd *io_req;
499 struct list_head *listp;
500 struct io_bdt *bd_tbl;
501 u32 free_sqes;
502 u32 max_sqes;
503 u16 xid;
504 int index = get_cpu();
505
506 max_sqes = BNX2FC_SCSI_MAX_SQES;
507 /*
508 * NOTE: Free list insertions and deletions are protected with
509 * cmgr lock
510 */
511 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
512 free_sqes = atomic_read(&tgt->free_sqes);
513 if ((list_empty(&cmd_mgr->free_list[index])) ||
514 (tgt->num_active_ios.counter >= max_sqes) ||
515 (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
516 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
517 put_cpu();
518 return NULL;
519 }
520
521 listp = (struct list_head *)
522 cmd_mgr->free_list[index].next;
523 list_del_init(listp);
524 io_req = (struct bnx2fc_cmd *) listp;
525 xid = io_req->xid;
526 cmd_mgr->cmds[xid] = io_req;
527 atomic_inc(&tgt->num_active_ios);
528 atomic_dec(&tgt->free_sqes);
529 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
530 put_cpu();
531
532 INIT_LIST_HEAD(&io_req->link);
533
534 io_req->port = port;
535 io_req->cmd_mgr = cmd_mgr;
536 io_req->req_flags = 0;
537
538 /* Bind io_bdt for this io_req */
539 /* Have a static link between io_req and io_bdt_pool */
540 bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
541 bd_tbl->io_req = io_req;
542
543 /* Hold the io_req against deletion */
544 kref_init(&io_req->refcount);
545 return io_req;
546 }
547
548 void bnx2fc_cmd_release(struct kref *ref)
549 {
550 struct bnx2fc_cmd *io_req = container_of(ref,
551 struct bnx2fc_cmd, refcount);
552 struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
553 int index;
554
555 if (io_req->cmd_type == BNX2FC_SCSI_CMD)
556 index = io_req->xid % num_possible_cpus();
557 else
558 index = RESERVE_FREE_LIST_INDEX;
559
560
561 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
562 if (io_req->cmd_type != BNX2FC_SCSI_CMD)
563 bnx2fc_free_mp_resc(io_req);
564 cmd_mgr->cmds[io_req->xid] = NULL;
565 /* Delete IO from retire queue */
566 list_del_init(&io_req->link);
567 /* Add it to the free list */
568 list_add(&io_req->link,
569 &cmd_mgr->free_list[index]);
570 atomic_dec(&io_req->tgt->num_active_ios);
571 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
572
573 }
574
575 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
576 {
577 struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
578 struct bnx2fc_interface *interface = io_req->port->priv;
579 struct bnx2fc_hba *hba = interface->hba;
580 size_t sz = sizeof(struct fcoe_bd_ctx);
581
582 /* clear tm flags */
583 mp_req->tm_flags = 0;
584 if (mp_req->mp_req_bd) {
585 dma_free_coherent(&hba->pcidev->dev, sz,
586 mp_req->mp_req_bd,
587 mp_req->mp_req_bd_dma);
588 mp_req->mp_req_bd = NULL;
589 }
590 if (mp_req->mp_resp_bd) {
591 dma_free_coherent(&hba->pcidev->dev, sz,
592 mp_req->mp_resp_bd,
593 mp_req->mp_resp_bd_dma);
594 mp_req->mp_resp_bd = NULL;
595 }
596 if (mp_req->req_buf) {
597 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
598 mp_req->req_buf,
599 mp_req->req_buf_dma);
600 mp_req->req_buf = NULL;
601 }
602 if (mp_req->resp_buf) {
603 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
604 mp_req->resp_buf,
605 mp_req->resp_buf_dma);
606 mp_req->resp_buf = NULL;
607 }
608 }
609
610 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
611 {
612 struct bnx2fc_mp_req *mp_req;
613 struct fcoe_bd_ctx *mp_req_bd;
614 struct fcoe_bd_ctx *mp_resp_bd;
615 struct bnx2fc_interface *interface = io_req->port->priv;
616 struct bnx2fc_hba *hba = interface->hba;
617 dma_addr_t addr;
618 size_t sz;
619
620 mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
621 memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
622
623 mp_req->req_len = sizeof(struct fcp_cmnd);
624 io_req->data_xfer_len = mp_req->req_len;
625 mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
626 &mp_req->req_buf_dma,
627 GFP_ATOMIC);
628 if (!mp_req->req_buf) {
629 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
630 bnx2fc_free_mp_resc(io_req);
631 return FAILED;
632 }
633
634 mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
635 &mp_req->resp_buf_dma,
636 GFP_ATOMIC);
637 if (!mp_req->resp_buf) {
638 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
639 bnx2fc_free_mp_resc(io_req);
640 return FAILED;
641 }
642 memset(mp_req->req_buf, 0, PAGE_SIZE);
643 memset(mp_req->resp_buf, 0, PAGE_SIZE);
644
645 /* Allocate and map mp_req_bd and mp_resp_bd */
646 sz = sizeof(struct fcoe_bd_ctx);
647 mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
648 &mp_req->mp_req_bd_dma,
649 GFP_ATOMIC);
650 if (!mp_req->mp_req_bd) {
651 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
652 bnx2fc_free_mp_resc(io_req);
653 return FAILED;
654 }
655 mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
656 &mp_req->mp_resp_bd_dma,
657 GFP_ATOMIC);
658 if (!mp_req->mp_resp_bd) {
659 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
660 bnx2fc_free_mp_resc(io_req);
661 return FAILED;
662 }
663 /* Fill bd table */
664 addr = mp_req->req_buf_dma;
665 mp_req_bd = mp_req->mp_req_bd;
666 mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
667 mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
668 mp_req_bd->buf_len = PAGE_SIZE;
669 mp_req_bd->flags = 0;
670
671 /*
672 * MP buffer is either a task mgmt command or an ELS.
673 * So the assumption is that it consumes a single bd
674 * entry in the bd table
675 */
676 mp_resp_bd = mp_req->mp_resp_bd;
677 addr = mp_req->resp_buf_dma;
678 mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
679 mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
680 mp_resp_bd->buf_len = PAGE_SIZE;
681 mp_resp_bd->flags = 0;
682
683 return SUCCESS;
684 }
685
686 static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
687 {
688 struct fc_lport *lport;
689 struct fc_rport *rport;
690 struct fc_rport_libfc_priv *rp;
691 struct fcoe_port *port;
692 struct bnx2fc_interface *interface;
693 struct bnx2fc_rport *tgt;
694 struct bnx2fc_cmd *io_req;
695 struct bnx2fc_mp_req *tm_req;
696 struct fcoe_task_ctx_entry *task;
697 struct fcoe_task_ctx_entry *task_page;
698 struct Scsi_Host *host = sc_cmd->device->host;
699 struct fc_frame_header *fc_hdr;
700 struct fcp_cmnd *fcp_cmnd;
701 int task_idx, index;
702 int rc = SUCCESS;
703 u16 xid;
704 u32 sid, did;
705 unsigned long start = jiffies;
706
707 lport = shost_priv(host);
708 rport = starget_to_rport(scsi_target(sc_cmd->device));
709 port = lport_priv(lport);
710 interface = port->priv;
711
712 if (rport == NULL) {
713 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
714 rc = FAILED;
715 goto tmf_err;
716 }
717 rp = rport->dd_data;
718
719 rc = fc_block_scsi_eh(sc_cmd);
720 if (rc)
721 return rc;
722
723 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
724 printk(KERN_ERR PFX "device_reset: link is not ready\n");
725 rc = FAILED;
726 goto tmf_err;
727 }
728 /* rport and tgt are allocated together, so tgt should be non-NULL */
729 tgt = (struct bnx2fc_rport *)&rp[1];
730
731 if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
732 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
733 rc = FAILED;
734 goto tmf_err;
735 }
736 retry_tmf:
737 io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
738 if (!io_req) {
739 if (time_after(jiffies, start + HZ)) {
740 printk(KERN_ERR PFX "tmf: Failed TMF");
741 rc = FAILED;
742 goto tmf_err;
743 }
744 msleep(20);
745 goto retry_tmf;
746 }
747 /* Initialize rest of io_req fields */
748 io_req->sc_cmd = sc_cmd;
749 io_req->port = port;
750 io_req->tgt = tgt;
751
752 tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
753
754 rc = bnx2fc_init_mp_req(io_req);
755 if (rc == FAILED) {
756 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
757 spin_lock_bh(&tgt->tgt_lock);
758 kref_put(&io_req->refcount, bnx2fc_cmd_release);
759 spin_unlock_bh(&tgt->tgt_lock);
760 goto tmf_err;
761 }
762
763 /* Set TM flags */
764 io_req->io_req_flags = 0;
765 tm_req->tm_flags = tm_flags;
766
767 /* Fill FCP_CMND */
768 bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
769 fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
770 memset(fcp_cmnd->fc_cdb, 0, sc_cmd->cmd_len);
771 fcp_cmnd->fc_dl = 0;
772
773 /* Fill FC header */
774 fc_hdr = &(tm_req->req_fc_hdr);
775 sid = tgt->sid;
776 did = rport->port_id;
777 __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
778 FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
779 FC_FC_SEQ_INIT, 0);
780 /* Obtain exchange id */
781 xid = io_req->xid;
782
783 BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
784 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
785 index = xid % BNX2FC_TASKS_PER_PAGE;
786
787 /* Initialize task context for this IO request */
788 task_page = (struct fcoe_task_ctx_entry *)
789 interface->hba->task_ctx[task_idx];
790 task = &(task_page[index]);
791 bnx2fc_init_mp_task(io_req, task);
792
793 sc_cmd->SCp.ptr = (char *)io_req;
794
795 /* Obtain free SQ entry */
796 spin_lock_bh(&tgt->tgt_lock);
797 bnx2fc_add_2_sq(tgt, xid);
798
799 /* Enqueue the io_req to active_tm_queue */
800 io_req->on_tmf_queue = 1;
801 list_add_tail(&io_req->link, &tgt->active_tm_queue);
802
803 init_completion(&io_req->tm_done);
804 io_req->wait_for_comp = 1;
805
806 /* Ring doorbell */
807 bnx2fc_ring_doorbell(tgt);
808 spin_unlock_bh(&tgt->tgt_lock);
809
810 rc = wait_for_completion_timeout(&io_req->tm_done,
811 BNX2FC_TM_TIMEOUT * HZ);
812 spin_lock_bh(&tgt->tgt_lock);
813
814 io_req->wait_for_comp = 0;
815 if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
816 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
817 if (io_req->on_tmf_queue) {
818 list_del_init(&io_req->link);
819 io_req->on_tmf_queue = 0;
820 }
821 io_req->wait_for_comp = 1;
822 bnx2fc_initiate_cleanup(io_req);
823 spin_unlock_bh(&tgt->tgt_lock);
824 rc = wait_for_completion_timeout(&io_req->tm_done,
825 BNX2FC_FW_TIMEOUT);
826 spin_lock_bh(&tgt->tgt_lock);
827 io_req->wait_for_comp = 0;
828 if (!rc)
829 kref_put(&io_req->refcount, bnx2fc_cmd_release);
830 }
831
832 spin_unlock_bh(&tgt->tgt_lock);
833
834 if (!rc) {
835 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
836 rc = FAILED;
837 } else {
838 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
839 rc = SUCCESS;
840 }
841 tmf_err:
842 return rc;
843 }
844
845 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
846 {
847 struct fc_lport *lport;
848 struct bnx2fc_rport *tgt = io_req->tgt;
849 struct fc_rport *rport = tgt->rport;
850 struct fc_rport_priv *rdata = tgt->rdata;
851 struct bnx2fc_interface *interface;
852 struct fcoe_port *port;
853 struct bnx2fc_cmd *abts_io_req;
854 struct fcoe_task_ctx_entry *task;
855 struct fcoe_task_ctx_entry *task_page;
856 struct fc_frame_header *fc_hdr;
857 struct bnx2fc_mp_req *abts_req;
858 int task_idx, index;
859 u32 sid, did;
860 u16 xid;
861 int rc = SUCCESS;
862 u32 r_a_tov = rdata->r_a_tov;
863
864 /* called with tgt_lock held */
865 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
866
867 port = io_req->port;
868 interface = port->priv;
869 lport = port->lport;
870
871 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
872 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
873 rc = FAILED;
874 goto abts_err;
875 }
876
877 if (rport == NULL) {
878 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
879 rc = FAILED;
880 goto abts_err;
881 }
882
883 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
884 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
885 rc = FAILED;
886 goto abts_err;
887 }
888
889 abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
890 if (!abts_io_req) {
891 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
892 rc = FAILED;
893 goto abts_err;
894 }
895
896 /* Initialize rest of io_req fields */
897 abts_io_req->sc_cmd = NULL;
898 abts_io_req->port = port;
899 abts_io_req->tgt = tgt;
900 abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
901
902 abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
903 memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
904
905 /* Fill FC header */
906 fc_hdr = &(abts_req->req_fc_hdr);
907
908 /* Obtain oxid and rxid for the original exchange to be aborted */
909 fc_hdr->fh_ox_id = htons(io_req->xid);
910 fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
911
912 sid = tgt->sid;
913 did = rport->port_id;
914
915 __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
916 FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
917 FC_FC_SEQ_INIT, 0);
918
919 xid = abts_io_req->xid;
920 BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
921 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
922 index = xid % BNX2FC_TASKS_PER_PAGE;
923
924 /* Initialize task context for this IO request */
925 task_page = (struct fcoe_task_ctx_entry *)
926 interface->hba->task_ctx[task_idx];
927 task = &(task_page[index]);
928 bnx2fc_init_mp_task(abts_io_req, task);
929
930 /*
931 * ABTS task is a temporary task that will be cleaned up
932 * irrespective of ABTS response. We need to start the timer
933 * for the original exchange, as the CQE is posted for the original
934 * IO request.
935 *
936 * Timer for ABTS is started only when it is originated by a
937 * TM request. For the ABTS issued as part of ULP timeout,
938 * scsi-ml maintains the timers.
939 */
940
941 /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
942 bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
943
944 /* Obtain free SQ entry */
945 bnx2fc_add_2_sq(tgt, xid);
946
947 /* Ring doorbell */
948 bnx2fc_ring_doorbell(tgt);
949
950 abts_err:
951 return rc;
952 }
953
954 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
955 enum fc_rctl r_ctl)
956 {
957 struct fc_lport *lport;
958 struct bnx2fc_rport *tgt = orig_io_req->tgt;
959 struct bnx2fc_interface *interface;
960 struct fcoe_port *port;
961 struct bnx2fc_cmd *seq_clnp_req;
962 struct fcoe_task_ctx_entry *task;
963 struct fcoe_task_ctx_entry *task_page;
964 struct bnx2fc_els_cb_arg *cb_arg = NULL;
965 int task_idx, index;
966 u16 xid;
967 int rc = 0;
968
969 BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
970 orig_io_req->xid);
971 kref_get(&orig_io_req->refcount);
972
973 port = orig_io_req->port;
974 interface = port->priv;
975 lport = port->lport;
976
977 cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
978 if (!cb_arg) {
979 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
980 rc = -ENOMEM;
981 goto cleanup_err;
982 }
983
984 seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
985 if (!seq_clnp_req) {
986 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
987 rc = -ENOMEM;
988 kfree(cb_arg);
989 goto cleanup_err;
990 }
991 /* Initialize rest of io_req fields */
992 seq_clnp_req->sc_cmd = NULL;
993 seq_clnp_req->port = port;
994 seq_clnp_req->tgt = tgt;
995 seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
996
997 xid = seq_clnp_req->xid;
998
999 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1000 index = xid % BNX2FC_TASKS_PER_PAGE;
1001
1002 /* Initialize task context for this IO request */
1003 task_page = (struct fcoe_task_ctx_entry *)
1004 interface->hba->task_ctx[task_idx];
1005 task = &(task_page[index]);
1006 cb_arg->aborted_io_req = orig_io_req;
1007 cb_arg->io_req = seq_clnp_req;
1008 cb_arg->r_ctl = r_ctl;
1009 cb_arg->offset = offset;
1010 seq_clnp_req->cb_arg = cb_arg;
1011
1012 printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
1013 bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
1014
1015 /* Obtain free SQ entry */
1016 bnx2fc_add_2_sq(tgt, xid);
1017
1018 /* Ring doorbell */
1019 bnx2fc_ring_doorbell(tgt);
1020 cleanup_err:
1021 return rc;
1022 }
1023
1024 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1025 {
1026 struct fc_lport *lport;
1027 struct bnx2fc_rport *tgt = io_req->tgt;
1028 struct bnx2fc_interface *interface;
1029 struct fcoe_port *port;
1030 struct bnx2fc_cmd *cleanup_io_req;
1031 struct fcoe_task_ctx_entry *task;
1032 struct fcoe_task_ctx_entry *task_page;
1033 int task_idx, index;
1034 u16 xid, orig_xid;
1035 int rc = 0;
1036
1037 /* ASSUMPTION: called with tgt_lock held */
1038 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1039
1040 port = io_req->port;
1041 interface = port->priv;
1042 lport = port->lport;
1043
1044 cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1045 if (!cleanup_io_req) {
1046 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1047 rc = -1;
1048 goto cleanup_err;
1049 }
1050
1051 /* Initialize rest of io_req fields */
1052 cleanup_io_req->sc_cmd = NULL;
1053 cleanup_io_req->port = port;
1054 cleanup_io_req->tgt = tgt;
1055 cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1056
1057 xid = cleanup_io_req->xid;
1058
1059 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1060 index = xid % BNX2FC_TASKS_PER_PAGE;
1061
1062 /* Initialize task context for this IO request */
1063 task_page = (struct fcoe_task_ctx_entry *)
1064 interface->hba->task_ctx[task_idx];
1065 task = &(task_page[index]);
1066 orig_xid = io_req->xid;
1067
1068 BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1069
1070 bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1071
1072 /* Obtain free SQ entry */
1073 bnx2fc_add_2_sq(tgt, xid);
1074
1075 /* Ring doorbell */
1076 bnx2fc_ring_doorbell(tgt);
1077
1078 cleanup_err:
1079 return rc;
1080 }
1081
1082 /**
1083 * bnx2fc_eh_target_reset: Reset a target
1084 *
1085 * @sc_cmd: SCSI command
1086 *
1087 * Set from SCSI host template to send task mgmt command to the target
1088 * and wait for the response
1089 */
1090 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1091 {
1092 return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1093 }
1094
1095 /**
1096 * bnx2fc_eh_device_reset - Reset a single LUN
1097 *
1098 * @sc_cmd: SCSI command
1099 *
1100 * Set from SCSI host template to send task mgmt command to the target
1101 * and wait for the response
1102 */
1103 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1104 {
1105 return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1106 }
1107
1108 int bnx2fc_expl_logo(struct fc_lport *lport, struct bnx2fc_cmd *io_req)
1109 {
1110 struct bnx2fc_rport *tgt = io_req->tgt;
1111 struct fc_rport_priv *rdata = tgt->rdata;
1112 int logo_issued;
1113 int rc = SUCCESS;
1114 int wait_cnt = 0;
1115
1116 BNX2FC_IO_DBG(io_req, "Expl logo - tgt flags = 0x%lx\n",
1117 tgt->flags);
1118 logo_issued = test_and_set_bit(BNX2FC_FLAG_EXPL_LOGO,
1119 &tgt->flags);
1120 io_req->wait_for_comp = 1;
1121 bnx2fc_initiate_cleanup(io_req);
1122
1123 spin_unlock_bh(&tgt->tgt_lock);
1124
1125 wait_for_completion(&io_req->tm_done);
1126
1127 io_req->wait_for_comp = 0;
1128 /*
1129 * release the reference taken in eh_abort to allow the
1130 * target to re-login after flushing IOs
1131 */
1132 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1133
1134 if (!logo_issued) {
1135 clear_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags);
1136 mutex_lock(&lport->disc.disc_mutex);
1137 lport->tt.rport_logoff(rdata);
1138 mutex_unlock(&lport->disc.disc_mutex);
1139 do {
1140 msleep(BNX2FC_RELOGIN_WAIT_TIME);
1141 if (wait_cnt++ > BNX2FC_RELOGIN_WAIT_CNT) {
1142 rc = FAILED;
1143 break;
1144 }
1145 } while (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags));
1146 }
1147 spin_lock_bh(&tgt->tgt_lock);
1148 return rc;
1149 }
1150 /**
1151 * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1152 * SCSI command
1153 *
1154 * @sc_cmd: SCSI_ML command pointer
1155 *
1156 * SCSI abort request handler
1157 */
1158 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1159 {
1160 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1161 struct fc_rport_libfc_priv *rp = rport->dd_data;
1162 struct bnx2fc_cmd *io_req;
1163 struct fc_lport *lport;
1164 struct bnx2fc_rport *tgt;
1165 int rc = FAILED;
1166
1167
1168 rc = fc_block_scsi_eh(sc_cmd);
1169 if (rc)
1170 return rc;
1171
1172 lport = shost_priv(sc_cmd->device->host);
1173 if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1174 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1175 return rc;
1176 }
1177
1178 tgt = (struct bnx2fc_rport *)&rp[1];
1179
1180 BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1181
1182 spin_lock_bh(&tgt->tgt_lock);
1183 io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1184 if (!io_req) {
1185 /* Command might have just completed */
1186 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1187 spin_unlock_bh(&tgt->tgt_lock);
1188 return SUCCESS;
1189 }
1190 BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1191 io_req->refcount.refcount.counter);
1192
1193 /* Hold IO request across abort processing */
1194 kref_get(&io_req->refcount);
1195
1196 BUG_ON(tgt != io_req->tgt);
1197
1198 /* Remove the io_req from the active_q. */
1199 /*
1200 * Task Mgmt functions (LUN RESET & TGT RESET) will not
1201 * issue an ABTS on this particular IO req, as the
1202 * io_req is no longer in the active_q.
1203 */
1204 if (tgt->flush_in_prog) {
1205 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1206 "flush in progress\n", io_req->xid);
1207 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1208 spin_unlock_bh(&tgt->tgt_lock);
1209 return SUCCESS;
1210 }
1211
1212 if (io_req->on_active_queue == 0) {
1213 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1214 "not on active_q\n", io_req->xid);
1215 /*
1216 * This condition can happen only due to the FW bug,
1217 * where we do not receive cleanup response from
1218 * the FW. Handle this case gracefully by erroring
1219 * back the IO request to SCSI-ml
1220 */
1221 bnx2fc_scsi_done(io_req, DID_ABORT);
1222
1223 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1224 spin_unlock_bh(&tgt->tgt_lock);
1225 return SUCCESS;
1226 }
1227
1228 /*
1229 * Only eh_abort processing will remove the IO from
1230 * active_cmd_q before processing the request. this is
1231 * done to avoid race conditions between IOs aborted
1232 * as part of task management completion and eh_abort
1233 * processing
1234 */
1235 list_del_init(&io_req->link);
1236 io_req->on_active_queue = 0;
1237 /* Move IO req to retire queue */
1238 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1239
1240 init_completion(&io_req->tm_done);
1241
1242 if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1243 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1244 "already in abts processing\n", io_req->xid);
1245 if (cancel_delayed_work(&io_req->timeout_work))
1246 kref_put(&io_req->refcount,
1247 bnx2fc_cmd_release); /* drop timer hold */
1248 rc = bnx2fc_expl_logo(lport, io_req);
1249 /* This only occurs when an task abort was requested while ABTS
1250 is in progress. Setting the IO_CLEANUP flag will skip the
1251 RRQ process in the case when the fw generated SCSI_CMD cmpl
1252 was a result from the ABTS request rather than the CLEANUP
1253 request */
1254 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1255 goto out;
1256 }
1257
1258 /* Cancel the current timer running on this io_req */
1259 if (cancel_delayed_work(&io_req->timeout_work))
1260 kref_put(&io_req->refcount,
1261 bnx2fc_cmd_release); /* drop timer hold */
1262 set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1263 io_req->wait_for_comp = 1;
1264 rc = bnx2fc_initiate_abts(io_req);
1265 if (rc == FAILED) {
1266 bnx2fc_initiate_cleanup(io_req);
1267 spin_unlock_bh(&tgt->tgt_lock);
1268 wait_for_completion(&io_req->tm_done);
1269 spin_lock_bh(&tgt->tgt_lock);
1270 io_req->wait_for_comp = 0;
1271 goto done;
1272 }
1273 spin_unlock_bh(&tgt->tgt_lock);
1274
1275 wait_for_completion(&io_req->tm_done);
1276
1277 spin_lock_bh(&tgt->tgt_lock);
1278 io_req->wait_for_comp = 0;
1279 if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1280 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1281 rc = SUCCESS;
1282 } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1283 &io_req->req_flags))) {
1284 /* Let the scsi-ml try to recover this command */
1285 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1286 io_req->xid);
1287 rc = bnx2fc_expl_logo(lport, io_req);
1288 goto out;
1289 } else {
1290 /*
1291 * We come here even when there was a race condition
1292 * between timeout and abts completion, and abts
1293 * completion happens just in time.
1294 */
1295 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1296 rc = SUCCESS;
1297 bnx2fc_scsi_done(io_req, DID_ABORT);
1298 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1299 }
1300 done:
1301 /* release the reference taken in eh_abort */
1302 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1303 out:
1304 spin_unlock_bh(&tgt->tgt_lock);
1305 return rc;
1306 }
1307
1308 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1309 struct fcoe_task_ctx_entry *task,
1310 u8 rx_state)
1311 {
1312 struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1313 struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1314 u32 offset = cb_arg->offset;
1315 enum fc_rctl r_ctl = cb_arg->r_ctl;
1316 int rc = 0;
1317 struct bnx2fc_rport *tgt = orig_io_req->tgt;
1318
1319 BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1320 "cmd_type = %d\n",
1321 seq_clnp_req->xid, seq_clnp_req->cmd_type);
1322
1323 if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1324 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1325 seq_clnp_req->xid);
1326 goto free_cb_arg;
1327 }
1328
1329 spin_unlock_bh(&tgt->tgt_lock);
1330 rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1331 spin_lock_bh(&tgt->tgt_lock);
1332
1333 if (rc)
1334 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1335 " IO will abort\n");
1336 seq_clnp_req->cb_arg = NULL;
1337 kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1338 free_cb_arg:
1339 kfree(cb_arg);
1340 return;
1341 }
1342
1343 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1344 struct fcoe_task_ctx_entry *task,
1345 u8 num_rq)
1346 {
1347 BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1348 "refcnt = %d, cmd_type = %d\n",
1349 io_req->refcount.refcount.counter, io_req->cmd_type);
1350 bnx2fc_scsi_done(io_req, DID_ERROR);
1351 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1352 if (io_req->wait_for_comp)
1353 complete(&io_req->tm_done);
1354 }
1355
1356 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1357 struct fcoe_task_ctx_entry *task,
1358 u8 num_rq)
1359 {
1360 u32 r_ctl;
1361 u32 r_a_tov = FC_DEF_R_A_TOV;
1362 u8 issue_rrq = 0;
1363 struct bnx2fc_rport *tgt = io_req->tgt;
1364
1365 BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1366 "refcnt = %d, cmd_type = %d\n",
1367 io_req->xid,
1368 io_req->refcount.refcount.counter, io_req->cmd_type);
1369
1370 if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1371 &io_req->req_flags)) {
1372 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1373 " this io\n");
1374 return;
1375 }
1376
1377 /* Do not issue RRQ as this IO is already cleanedup */
1378 if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1379 &io_req->req_flags))
1380 goto io_compl;
1381
1382 /*
1383 * For ABTS issued due to SCSI eh_abort_handler, timeout
1384 * values are maintained by scsi-ml itself. Cancel timeout
1385 * in case ABTS issued as part of task management function
1386 * or due to FW error.
1387 */
1388 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1389 if (cancel_delayed_work(&io_req->timeout_work))
1390 kref_put(&io_req->refcount,
1391 bnx2fc_cmd_release); /* drop timer hold */
1392
1393 r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1394
1395 switch (r_ctl) {
1396 case FC_RCTL_BA_ACC:
1397 /*
1398 * Dont release this cmd yet. It will be relesed
1399 * after we get RRQ response
1400 */
1401 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1402 issue_rrq = 1;
1403 break;
1404
1405 case FC_RCTL_BA_RJT:
1406 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1407 break;
1408 default:
1409 printk(KERN_ERR PFX "Unknown ABTS response\n");
1410 break;
1411 }
1412
1413 if (issue_rrq) {
1414 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1415 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1416 }
1417 set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1418 bnx2fc_cmd_timer_set(io_req, r_a_tov);
1419
1420 io_compl:
1421 if (io_req->wait_for_comp) {
1422 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1423 &io_req->req_flags))
1424 complete(&io_req->tm_done);
1425 } else {
1426 /*
1427 * We end up here when ABTS is issued as
1428 * in asynchronous context, i.e., as part
1429 * of task management completion, or
1430 * when FW error is received or when the
1431 * ABTS is issued when the IO is timed
1432 * out.
1433 */
1434
1435 if (io_req->on_active_queue) {
1436 list_del_init(&io_req->link);
1437 io_req->on_active_queue = 0;
1438 /* Move IO req to retire queue */
1439 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1440 }
1441 bnx2fc_scsi_done(io_req, DID_ERROR);
1442 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1443 }
1444 }
1445
1446 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1447 {
1448 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1449 struct bnx2fc_rport *tgt = io_req->tgt;
1450 struct bnx2fc_cmd *cmd, *tmp;
1451 int tm_lun = sc_cmd->device->lun;
1452 int rc = 0;
1453 int lun;
1454
1455 /* called with tgt_lock held */
1456 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1457 /*
1458 * Walk thru the active_ios queue and ABORT the IO
1459 * that matches with the LUN that was reset
1460 */
1461 list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1462 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1463 lun = cmd->sc_cmd->device->lun;
1464 if (lun == tm_lun) {
1465 /* Initiate ABTS on this cmd */
1466 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1467 &cmd->req_flags)) {
1468 /* cancel the IO timeout */
1469 if (cancel_delayed_work(&io_req->timeout_work))
1470 kref_put(&io_req->refcount,
1471 bnx2fc_cmd_release);
1472 /* timer hold */
1473 rc = bnx2fc_initiate_abts(cmd);
1474 /* abts shouldn't fail in this context */
1475 WARN_ON(rc != SUCCESS);
1476 } else
1477 printk(KERN_ERR PFX "lun_rst: abts already in"
1478 " progress for this IO 0x%x\n",
1479 cmd->xid);
1480 }
1481 }
1482 }
1483
1484 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1485 {
1486 struct bnx2fc_rport *tgt = io_req->tgt;
1487 struct bnx2fc_cmd *cmd, *tmp;
1488 int rc = 0;
1489
1490 /* called with tgt_lock held */
1491 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1492 /*
1493 * Walk thru the active_ios queue and ABORT the IO
1494 * that matches with the LUN that was reset
1495 */
1496 list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1497 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1498 /* Initiate ABTS */
1499 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1500 &cmd->req_flags)) {
1501 /* cancel the IO timeout */
1502 if (cancel_delayed_work(&io_req->timeout_work))
1503 kref_put(&io_req->refcount,
1504 bnx2fc_cmd_release); /* timer hold */
1505 rc = bnx2fc_initiate_abts(cmd);
1506 /* abts shouldn't fail in this context */
1507 WARN_ON(rc != SUCCESS);
1508
1509 } else
1510 printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1511 " for this IO 0x%x\n", cmd->xid);
1512 }
1513 }
1514
1515 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1516 struct fcoe_task_ctx_entry *task, u8 num_rq)
1517 {
1518 struct bnx2fc_mp_req *tm_req;
1519 struct fc_frame_header *fc_hdr;
1520 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1521 u64 *hdr;
1522 u64 *temp_hdr;
1523 void *rsp_buf;
1524
1525 /* Called with tgt_lock held */
1526 BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1527
1528 if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1529 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1530 else {
1531 /* TM has already timed out and we got
1532 * delayed completion. Ignore completion
1533 * processing.
1534 */
1535 return;
1536 }
1537
1538 tm_req = &(io_req->mp_req);
1539 fc_hdr = &(tm_req->resp_fc_hdr);
1540 hdr = (u64 *)fc_hdr;
1541 temp_hdr = (u64 *)
1542 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1543 hdr[0] = cpu_to_be64(temp_hdr[0]);
1544 hdr[1] = cpu_to_be64(temp_hdr[1]);
1545 hdr[2] = cpu_to_be64(temp_hdr[2]);
1546
1547 tm_req->resp_len =
1548 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1549
1550 rsp_buf = tm_req->resp_buf;
1551
1552 if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1553 bnx2fc_parse_fcp_rsp(io_req,
1554 (struct fcoe_fcp_rsp_payload *)
1555 rsp_buf, num_rq);
1556 if (io_req->fcp_rsp_code == 0) {
1557 /* TM successful */
1558 if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1559 bnx2fc_lun_reset_cmpl(io_req);
1560 else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1561 bnx2fc_tgt_reset_cmpl(io_req);
1562 }
1563 } else {
1564 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1565 fc_hdr->fh_r_ctl);
1566 }
1567 if (!sc_cmd->SCp.ptr) {
1568 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1569 return;
1570 }
1571 switch (io_req->fcp_status) {
1572 case FC_GOOD:
1573 if (io_req->cdb_status == 0) {
1574 /* Good IO completion */
1575 sc_cmd->result = DID_OK << 16;
1576 } else {
1577 /* Transport status is good, SCSI status not good */
1578 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1579 }
1580 if (io_req->fcp_resid)
1581 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1582 break;
1583
1584 default:
1585 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1586 io_req->fcp_status);
1587 break;
1588 }
1589
1590 sc_cmd = io_req->sc_cmd;
1591 io_req->sc_cmd = NULL;
1592
1593 /* check if the io_req exists in tgt's tmf_q */
1594 if (io_req->on_tmf_queue) {
1595
1596 list_del_init(&io_req->link);
1597 io_req->on_tmf_queue = 0;
1598 } else {
1599
1600 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1601 return;
1602 }
1603
1604 sc_cmd->SCp.ptr = NULL;
1605 sc_cmd->scsi_done(sc_cmd);
1606
1607 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1608 if (io_req->wait_for_comp) {
1609 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1610 complete(&io_req->tm_done);
1611 }
1612 }
1613
1614 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1615 int bd_index)
1616 {
1617 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1618 int frag_size, sg_frags;
1619
1620 sg_frags = 0;
1621 while (sg_len) {
1622 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1623 frag_size = BNX2FC_BD_SPLIT_SZ;
1624 else
1625 frag_size = sg_len;
1626 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1627 bd[bd_index + sg_frags].buf_addr_hi = addr >> 32;
1628 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1629 bd[bd_index + sg_frags].flags = 0;
1630
1631 addr += (u64) frag_size;
1632 sg_frags++;
1633 sg_len -= frag_size;
1634 }
1635 return sg_frags;
1636
1637 }
1638
1639 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1640 {
1641 struct bnx2fc_interface *interface = io_req->port->priv;
1642 struct bnx2fc_hba *hba = interface->hba;
1643 struct scsi_cmnd *sc = io_req->sc_cmd;
1644 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1645 struct scatterlist *sg;
1646 int byte_count = 0;
1647 int sg_count = 0;
1648 int bd_count = 0;
1649 int sg_frags;
1650 unsigned int sg_len;
1651 u64 addr;
1652 int i;
1653
1654 sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1655 scsi_sg_count(sc), sc->sc_data_direction);
1656 scsi_for_each_sg(sc, sg, sg_count, i) {
1657 sg_len = sg_dma_len(sg);
1658 addr = sg_dma_address(sg);
1659 if (sg_len > BNX2FC_MAX_BD_LEN) {
1660 sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1661 bd_count);
1662 } else {
1663
1664 sg_frags = 1;
1665 bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1666 bd[bd_count].buf_addr_hi = addr >> 32;
1667 bd[bd_count].buf_len = (u16)sg_len;
1668 bd[bd_count].flags = 0;
1669 }
1670 bd_count += sg_frags;
1671 byte_count += sg_len;
1672 }
1673 if (byte_count != scsi_bufflen(sc))
1674 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1675 "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1676 io_req->xid);
1677 return bd_count;
1678 }
1679
1680 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1681 {
1682 struct scsi_cmnd *sc = io_req->sc_cmd;
1683 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1684 int bd_count;
1685
1686 if (scsi_sg_count(sc)) {
1687 bd_count = bnx2fc_map_sg(io_req);
1688 if (bd_count == 0)
1689 return -ENOMEM;
1690 } else {
1691 bd_count = 0;
1692 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1693 bd[0].buf_len = bd[0].flags = 0;
1694 }
1695 io_req->bd_tbl->bd_valid = bd_count;
1696
1697 return 0;
1698 }
1699
1700 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1701 {
1702 struct scsi_cmnd *sc = io_req->sc_cmd;
1703
1704 if (io_req->bd_tbl->bd_valid && sc) {
1705 scsi_dma_unmap(sc);
1706 io_req->bd_tbl->bd_valid = 0;
1707 }
1708 }
1709
1710 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1711 struct fcp_cmnd *fcp_cmnd)
1712 {
1713 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1714 char tag[2];
1715
1716 memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1717
1718 int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1719
1720 fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1721 memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1722
1723 fcp_cmnd->fc_cmdref = 0;
1724 fcp_cmnd->fc_pri_ta = 0;
1725 fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1726 fcp_cmnd->fc_flags = io_req->io_req_flags;
1727
1728 if (scsi_populate_tag_msg(sc_cmd, tag)) {
1729 switch (tag[0]) {
1730 case HEAD_OF_QUEUE_TAG:
1731 fcp_cmnd->fc_pri_ta = FCP_PTA_HEADQ;
1732 break;
1733 case ORDERED_QUEUE_TAG:
1734 fcp_cmnd->fc_pri_ta = FCP_PTA_ORDERED;
1735 break;
1736 default:
1737 fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1738 break;
1739 }
1740 } else {
1741 fcp_cmnd->fc_pri_ta = 0;
1742 }
1743 }
1744
1745 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1746 struct fcoe_fcp_rsp_payload *fcp_rsp,
1747 u8 num_rq)
1748 {
1749 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1750 struct bnx2fc_rport *tgt = io_req->tgt;
1751 u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1752 u32 rq_buff_len = 0;
1753 int i;
1754 unsigned char *rq_data;
1755 unsigned char *dummy;
1756 int fcp_sns_len = 0;
1757 int fcp_rsp_len = 0;
1758
1759 io_req->fcp_status = FC_GOOD;
1760 io_req->fcp_resid = fcp_rsp->fcp_resid;
1761
1762 io_req->scsi_comp_flags = rsp_flags;
1763 CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1764 fcp_rsp->scsi_status_code;
1765
1766 /* Fetch fcp_rsp_info and fcp_sns_info if available */
1767 if (num_rq) {
1768
1769 /*
1770 * We do not anticipate num_rq >1, as the linux defined
1771 * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1772 * 256 bytes of single rq buffer is good enough to hold this.
1773 */
1774
1775 if (rsp_flags &
1776 FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1777 fcp_rsp_len = rq_buff_len
1778 = fcp_rsp->fcp_rsp_len;
1779 }
1780
1781 if (rsp_flags &
1782 FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1783 fcp_sns_len = fcp_rsp->fcp_sns_len;
1784 rq_buff_len += fcp_rsp->fcp_sns_len;
1785 }
1786
1787 io_req->fcp_rsp_len = fcp_rsp_len;
1788 io_req->fcp_sns_len = fcp_sns_len;
1789
1790 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1791 /* Invalid sense sense length. */
1792 printk(KERN_ERR PFX "invalid sns length %d\n",
1793 rq_buff_len);
1794 /* reset rq_buff_len */
1795 rq_buff_len = num_rq * BNX2FC_RQ_BUF_SZ;
1796 }
1797
1798 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1799
1800 if (num_rq > 1) {
1801 /* We do not need extra sense data */
1802 for (i = 1; i < num_rq; i++)
1803 dummy = bnx2fc_get_next_rqe(tgt, 1);
1804 }
1805
1806 /* fetch fcp_rsp_code */
1807 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1808 /* Only for task management function */
1809 io_req->fcp_rsp_code = rq_data[3];
1810 printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1811 io_req->fcp_rsp_code);
1812 }
1813
1814 /* fetch sense data */
1815 rq_data += fcp_rsp_len;
1816
1817 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1818 printk(KERN_ERR PFX "Truncating sense buffer\n");
1819 fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1820 }
1821
1822 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1823 if (fcp_sns_len)
1824 memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1825
1826 /* return RQ entries */
1827 for (i = 0; i < num_rq; i++)
1828 bnx2fc_return_rqe(tgt, 1);
1829 }
1830 }
1831
1832 /**
1833 * bnx2fc_queuecommand - Queuecommand function of the scsi template
1834 *
1835 * @host: The Scsi_Host the command was issued to
1836 * @sc_cmd: struct scsi_cmnd to be executed
1837 *
1838 * This is the IO strategy routine, called by SCSI-ML
1839 **/
1840 int bnx2fc_queuecommand(struct Scsi_Host *host,
1841 struct scsi_cmnd *sc_cmd)
1842 {
1843 struct fc_lport *lport = shost_priv(host);
1844 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1845 struct fc_rport_libfc_priv *rp = rport->dd_data;
1846 struct bnx2fc_rport *tgt;
1847 struct bnx2fc_cmd *io_req;
1848 int rc = 0;
1849 int rval;
1850
1851 rval = fc_remote_port_chkready(rport);
1852 if (rval) {
1853 sc_cmd->result = rval;
1854 sc_cmd->scsi_done(sc_cmd);
1855 return 0;
1856 }
1857
1858 if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1859 rc = SCSI_MLQUEUE_HOST_BUSY;
1860 goto exit_qcmd;
1861 }
1862
1863 /* rport and tgt are allocated together, so tgt should be non-NULL */
1864 tgt = (struct bnx2fc_rport *)&rp[1];
1865
1866 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1867 /*
1868 * Session is not offloaded yet. Let SCSI-ml retry
1869 * the command.
1870 */
1871 rc = SCSI_MLQUEUE_TARGET_BUSY;
1872 goto exit_qcmd;
1873 }
1874
1875 io_req = bnx2fc_cmd_alloc(tgt);
1876 if (!io_req) {
1877 rc = SCSI_MLQUEUE_HOST_BUSY;
1878 goto exit_qcmd;
1879 }
1880 io_req->sc_cmd = sc_cmd;
1881
1882 if (bnx2fc_post_io_req(tgt, io_req)) {
1883 printk(KERN_ERR PFX "Unable to post io_req\n");
1884 rc = SCSI_MLQUEUE_HOST_BUSY;
1885 goto exit_qcmd;
1886 }
1887 exit_qcmd:
1888 return rc;
1889 }
1890
1891 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1892 struct fcoe_task_ctx_entry *task,
1893 u8 num_rq)
1894 {
1895 struct fcoe_fcp_rsp_payload *fcp_rsp;
1896 struct bnx2fc_rport *tgt = io_req->tgt;
1897 struct scsi_cmnd *sc_cmd;
1898 struct Scsi_Host *host;
1899
1900
1901 /* scsi_cmd_cmpl is called with tgt lock held */
1902
1903 if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1904 /* we will not receive ABTS response for this IO */
1905 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1906 "this scsi cmd\n");
1907 }
1908
1909 /* Cancel the timeout_work, as we received IO completion */
1910 if (cancel_delayed_work(&io_req->timeout_work))
1911 kref_put(&io_req->refcount,
1912 bnx2fc_cmd_release); /* drop timer hold */
1913
1914 sc_cmd = io_req->sc_cmd;
1915 if (sc_cmd == NULL) {
1916 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1917 return;
1918 }
1919
1920 /* Fetch fcp_rsp from task context and perform cmd completion */
1921 fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1922 &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1923
1924 /* parse fcp_rsp and obtain sense data from RQ if available */
1925 bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1926
1927 host = sc_cmd->device->host;
1928 if (!sc_cmd->SCp.ptr) {
1929 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1930 return;
1931 }
1932
1933 if (io_req->on_active_queue) {
1934 list_del_init(&io_req->link);
1935 io_req->on_active_queue = 0;
1936 /* Move IO req to retire queue */
1937 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1938 } else {
1939 /* This should not happen, but could have been pulled
1940 * by bnx2fc_flush_active_ios(), or during a race
1941 * between command abort and (late) completion.
1942 */
1943 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1944 if (io_req->wait_for_comp)
1945 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1946 &io_req->req_flags))
1947 complete(&io_req->tm_done);
1948 }
1949
1950 bnx2fc_unmap_sg_list(io_req);
1951 io_req->sc_cmd = NULL;
1952
1953 switch (io_req->fcp_status) {
1954 case FC_GOOD:
1955 if (io_req->cdb_status == 0) {
1956 /* Good IO completion */
1957 sc_cmd->result = DID_OK << 16;
1958 } else {
1959 /* Transport status is good, SCSI status not good */
1960 BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1961 " fcp_resid = 0x%x\n",
1962 io_req->cdb_status, io_req->fcp_resid);
1963 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1964 }
1965 if (io_req->fcp_resid)
1966 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1967 break;
1968 default:
1969 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1970 io_req->fcp_status);
1971 break;
1972 }
1973 sc_cmd->SCp.ptr = NULL;
1974 sc_cmd->scsi_done(sc_cmd);
1975 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1976 }
1977
1978 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1979 struct bnx2fc_cmd *io_req)
1980 {
1981 struct fcoe_task_ctx_entry *task;
1982 struct fcoe_task_ctx_entry *task_page;
1983 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1984 struct fcoe_port *port = tgt->port;
1985 struct bnx2fc_interface *interface = port->priv;
1986 struct bnx2fc_hba *hba = interface->hba;
1987 struct fc_lport *lport = port->lport;
1988 struct fc_stats *stats;
1989 int task_idx, index;
1990 u16 xid;
1991
1992 /* Initialize rest of io_req fields */
1993 io_req->cmd_type = BNX2FC_SCSI_CMD;
1994 io_req->port = port;
1995 io_req->tgt = tgt;
1996 io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1997 sc_cmd->SCp.ptr = (char *)io_req;
1998
1999 stats = per_cpu_ptr(lport->stats, get_cpu());
2000 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
2001 io_req->io_req_flags = BNX2FC_READ;
2002 stats->InputRequests++;
2003 stats->InputBytes += io_req->data_xfer_len;
2004 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2005 io_req->io_req_flags = BNX2FC_WRITE;
2006 stats->OutputRequests++;
2007 stats->OutputBytes += io_req->data_xfer_len;
2008 } else {
2009 io_req->io_req_flags = 0;
2010 stats->ControlRequests++;
2011 }
2012 put_cpu();
2013
2014 xid = io_req->xid;
2015
2016 /* Build buffer descriptor list for firmware from sg list */
2017 if (bnx2fc_build_bd_list_from_sg(io_req)) {
2018 printk(KERN_ERR PFX "BD list creation failed\n");
2019 spin_lock_bh(&tgt->tgt_lock);
2020 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2021 spin_unlock_bh(&tgt->tgt_lock);
2022 return -EAGAIN;
2023 }
2024
2025 task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2026 index = xid % BNX2FC_TASKS_PER_PAGE;
2027
2028 /* Initialize task context for this IO request */
2029 task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2030 task = &(task_page[index]);
2031 bnx2fc_init_task(io_req, task);
2032
2033 spin_lock_bh(&tgt->tgt_lock);
2034
2035 if (tgt->flush_in_prog) {
2036 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2037 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2038 spin_unlock_bh(&tgt->tgt_lock);
2039 return -EAGAIN;
2040 }
2041
2042 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2043 printk(KERN_ERR PFX "Session not ready...post_io\n");
2044 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2045 spin_unlock_bh(&tgt->tgt_lock);
2046 return -EAGAIN;
2047 }
2048
2049 /* Time IO req */
2050 if (tgt->io_timeout)
2051 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2052 /* Obtain free SQ entry */
2053 bnx2fc_add_2_sq(tgt, xid);
2054
2055 /* Enqueue the io_req to active_cmd_queue */
2056
2057 io_req->on_active_queue = 1;
2058 /* move io_req from pending_queue to active_queue */
2059 list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2060
2061 /* Ring doorbell */
2062 bnx2fc_ring_doorbell(tgt);
2063 spin_unlock_bh(&tgt->tgt_lock);
2064 return 0;
2065 }
Linux with added FPC-III support