?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Realtek cr: Add autosuspend function.
[zen-stable.git] / drivers / scsi / bnx2fc / bnx2fc_io.c
blobb5b5c346d7793b352066409ce85364e00c1b0ffa
1 /* bnx2fc_io.c: Broadcom NetXtreme II Linux FCoE offload driver.
2 * IO manager and SCSI IO processing.
3 *
4 * Copyright (c) 2008 - 2010 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 void bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
21 static int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
22 struct bnx2fc_cmd *io_req);
23 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
24 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
25 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
26 struct fcoe_fcp_rsp_payload *fcp_rsp,
27 u8 num_rq);
28
29 void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
30 unsigned int timer_msec)
31 {
32 struct bnx2fc_hba *hba = io_req->port->priv;
33
34 if (queue_delayed_work(hba->timer_work_queue, &io_req->timeout_work,
35 msecs_to_jiffies(timer_msec)))
36 kref_get(&io_req->refcount);
37 }
38
39 static void bnx2fc_cmd_timeout(struct work_struct *work)
40 {
41 struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
42 timeout_work.work);
43 struct fc_lport *lport;
44 struct fc_rport_priv *rdata;
45 u8 cmd_type = io_req->cmd_type;
46 struct bnx2fc_rport *tgt = io_req->tgt;
47 int logo_issued;
48 int rc;
49
50 BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
51 "req_flags = %lx\n", cmd_type, io_req->req_flags);
52
53 spin_lock_bh(&tgt->tgt_lock);
54 if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
55 clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
56 /*
57 * ideally we should hold the io_req until RRQ complets,
58 * and release io_req from timeout hold.
59 */
60 spin_unlock_bh(&tgt->tgt_lock);
61 bnx2fc_send_rrq(io_req);
62 return;
63 }
64 if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
65 BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
66 goto done;
67 }
68
69 switch (cmd_type) {
70 case BNX2FC_SCSI_CMD:
71 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
72 &io_req->req_flags)) {
73 /* Handle eh_abort timeout */
74 BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
75 complete(&io_req->tm_done);
76 } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
77 &io_req->req_flags)) {
78 /* Handle internally generated ABTS timeout */
79 BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
80 io_req->refcount.refcount.counter);
81 if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
82 &io_req->req_flags))) {
83
84 lport = io_req->port->lport;
85 rdata = io_req->tgt->rdata;
86 logo_issued = test_and_set_bit(
87 BNX2FC_FLAG_EXPL_LOGO,
88 &tgt->flags);
89 kref_put(&io_req->refcount, bnx2fc_cmd_release);
90 spin_unlock_bh(&tgt->tgt_lock);
91
92 /* Explicitly logo the target */
93 if (!logo_issued) {
94 BNX2FC_IO_DBG(io_req, "Explicit "
95 "logo - tgt flags = 0x%lx\n",
96 tgt->flags);
97
98 mutex_lock(&lport->disc.disc_mutex);
99 lport->tt.rport_logoff(rdata);
100 mutex_unlock(&lport->disc.disc_mutex);
101 }
102 return;
103 }
104 } else {
105 /* Hanlde IO timeout */
106 BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
107 if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
108 &io_req->req_flags)) {
109 BNX2FC_IO_DBG(io_req, "IO completed before "
110 " timer expiry\n");
111 goto done;
112 }
113
114 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
115 &io_req->req_flags)) {
116 rc = bnx2fc_initiate_abts(io_req);
117 if (rc == SUCCESS)
118 goto done;
119 /*
120 * Explicitly logo the target if
121 * abts initiation fails
122 */
123 lport = io_req->port->lport;
124 rdata = io_req->tgt->rdata;
125 logo_issued = test_and_set_bit(
126 BNX2FC_FLAG_EXPL_LOGO,
127 &tgt->flags);
128 kref_put(&io_req->refcount, bnx2fc_cmd_release);
129 spin_unlock_bh(&tgt->tgt_lock);
130
131 if (!logo_issued) {
132 BNX2FC_IO_DBG(io_req, "Explicit "
133 "logo - tgt flags = 0x%lx\n",
134 tgt->flags);
135
136
137 mutex_lock(&lport->disc.disc_mutex);
138 lport->tt.rport_logoff(rdata);
139 mutex_unlock(&lport->disc.disc_mutex);
140 }
141 return;
142 } else {
143 BNX2FC_IO_DBG(io_req, "IO already in "
144 "ABTS processing\n");
145 }
146 }
147 break;
148 case BNX2FC_ELS:
149
150 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
151 BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
152
153 if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
154 &io_req->req_flags)) {
155 lport = io_req->port->lport;
156 rdata = io_req->tgt->rdata;
157 logo_issued = test_and_set_bit(
158 BNX2FC_FLAG_EXPL_LOGO,
159 &tgt->flags);
160 kref_put(&io_req->refcount, bnx2fc_cmd_release);
161 spin_unlock_bh(&tgt->tgt_lock);
162
163 /* Explicitly logo the target */
164 if (!logo_issued) {
165 BNX2FC_IO_DBG(io_req, "Explicitly logo"
166 "(els)\n");
167 mutex_lock(&lport->disc.disc_mutex);
168 lport->tt.rport_logoff(rdata);
169 mutex_unlock(&lport->disc.disc_mutex);
170 }
171 return;
172 }
173 } else {
174 /*
175 * Handle ELS timeout.
176 * tgt_lock is used to sync compl path and timeout
177 * path. If els compl path is processing this IO, we
178 * have nothing to do here, just release the timer hold
179 */
180 BNX2FC_IO_DBG(io_req, "ELS timed out\n");
181 if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
182 &io_req->req_flags))
183 goto done;
184
185 /* Indicate the cb_func that this ELS is timed out */
186 set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
187
188 if ((io_req->cb_func) && (io_req->cb_arg)) {
189 io_req->cb_func(io_req->cb_arg);
190 io_req->cb_arg = NULL;
191 }
192 }
193 break;
194 default:
195 printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
196 cmd_type);
197 break;
198 }
199
200 done:
201 /* release the cmd that was held when timer was set */
202 kref_put(&io_req->refcount, bnx2fc_cmd_release);
203 spin_unlock_bh(&tgt->tgt_lock);
204 }
205
206 static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
207 {
208 /* Called with host lock held */
209 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
210
211 /*
212 * active_cmd_queue may have other command types as well,
213 * and during flush operation, we want to error back only
214 * scsi commands.
215 */
216 if (io_req->cmd_type != BNX2FC_SCSI_CMD)
217 return;
218
219 BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
220 bnx2fc_unmap_sg_list(io_req);
221 io_req->sc_cmd = NULL;
222 if (!sc_cmd) {
223 printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
224 "IO(0x%x) already cleaned up\n",
225 io_req->xid);
226 return;
227 }
228 sc_cmd->result = err_code << 16;
229
230 BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
231 sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
232 sc_cmd->allowed);
233 scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
234 sc_cmd->SCp.ptr = NULL;
235 sc_cmd->scsi_done(sc_cmd);
236 }
237
238 struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba,
239 u16 min_xid, u16 max_xid)
240 {
241 struct bnx2fc_cmd_mgr *cmgr;
242 struct io_bdt *bdt_info;
243 struct bnx2fc_cmd *io_req;
244 size_t len;
245 u32 mem_size;
246 u16 xid;
247 int i;
248 int num_ios, num_pri_ios;
249 size_t bd_tbl_sz;
250 int arr_sz = num_possible_cpus() + 1;
251
252 if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
253 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
254 and max_xid 0x%x\n", min_xid, max_xid);
255 return NULL;
256 }
257 BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
258
259 num_ios = max_xid - min_xid + 1;
260 len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
261 len += sizeof(struct bnx2fc_cmd_mgr);
262
263 cmgr = kzalloc(len, GFP_KERNEL);
264 if (!cmgr) {
265 printk(KERN_ERR PFX "failed to alloc cmgr\n");
266 return NULL;
267 }
268
269 cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
270 arr_sz, GFP_KERNEL);
271 if (!cmgr->free_list) {
272 printk(KERN_ERR PFX "failed to alloc free_list\n");
273 goto mem_err;
274 }
275
276 cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
277 arr_sz, GFP_KERNEL);
278 if (!cmgr->free_list_lock) {
279 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
280 goto mem_err;
281 }
282
283 cmgr->hba = hba;
284 cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
285
286 for (i = 0; i < arr_sz; i++) {
287 INIT_LIST_HEAD(&cmgr->free_list[i]);
288 spin_lock_init(&cmgr->free_list_lock[i]);
289 }
290
291 /*
292 * Pre-allocated pool of bnx2fc_cmds.
293 * Last entry in the free list array is the free list
294 * of slow path requests.
295 */
296 xid = BNX2FC_MIN_XID;
297 num_pri_ios = num_ios - BNX2FC_ELSTM_XIDS;
298 for (i = 0; i < num_ios; i++) {
299 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
300
301 if (!io_req) {
302 printk(KERN_ERR PFX "failed to alloc io_req\n");
303 goto mem_err;
304 }
305
306 INIT_LIST_HEAD(&io_req->link);
307 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
308
309 io_req->xid = xid++;
310 if (i < num_pri_ios)
311 list_add_tail(&io_req->link,
312 &cmgr->free_list[io_req->xid %
313 num_possible_cpus()]);
314 else
315 list_add_tail(&io_req->link,
316 &cmgr->free_list[num_possible_cpus()]);
317 io_req++;
318 }
319
320 /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
321 mem_size = num_ios * sizeof(struct io_bdt *);
322 cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
323 if (!cmgr->io_bdt_pool) {
324 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
325 goto mem_err;
326 }
327
328 mem_size = sizeof(struct io_bdt);
329 for (i = 0; i < num_ios; i++) {
330 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
331 if (!cmgr->io_bdt_pool[i]) {
332 printk(KERN_ERR PFX "failed to alloc "
333 "io_bdt_pool[%d]\n", i);
334 goto mem_err;
335 }
336 }
337
338 /* Allocate an map fcoe_bdt_ctx structures */
339 bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
340 for (i = 0; i < num_ios; i++) {
341 bdt_info = cmgr->io_bdt_pool[i];
342 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
343 bd_tbl_sz,
344 &bdt_info->bd_tbl_dma,
345 GFP_KERNEL);
346 if (!bdt_info->bd_tbl) {
347 printk(KERN_ERR PFX "failed to alloc "
348 "bdt_tbl[%d]\n", i);
349 goto mem_err;
350 }
351 }
352
353 return cmgr;
354
355 mem_err:
356 bnx2fc_cmd_mgr_free(cmgr);
357 return NULL;
358 }
359
360 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
361 {
362 struct io_bdt *bdt_info;
363 struct bnx2fc_hba *hba = cmgr->hba;
364 size_t bd_tbl_sz;
365 u16 min_xid = BNX2FC_MIN_XID;
366 u16 max_xid = BNX2FC_MAX_XID;
367 int num_ios;
368 int i;
369
370 num_ios = max_xid - min_xid + 1;
371
372 /* Free fcoe_bdt_ctx structures */
373 if (!cmgr->io_bdt_pool)
374 goto free_cmd_pool;
375
376 bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
377 for (i = 0; i < num_ios; i++) {
378 bdt_info = cmgr->io_bdt_pool[i];
379 if (bdt_info->bd_tbl) {
380 dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
381 bdt_info->bd_tbl,
382 bdt_info->bd_tbl_dma);
383 bdt_info->bd_tbl = NULL;
384 }
385 }
386
387 /* Destroy io_bdt pool */
388 for (i = 0; i < num_ios; i++) {
389 kfree(cmgr->io_bdt_pool[i]);
390 cmgr->io_bdt_pool[i] = NULL;
391 }
392
393 kfree(cmgr->io_bdt_pool);
394 cmgr->io_bdt_pool = NULL;
395
396 free_cmd_pool:
397 kfree(cmgr->free_list_lock);
398
399 /* Destroy cmd pool */
400 if (!cmgr->free_list)
401 goto free_cmgr;
402
403 for (i = 0; i < num_possible_cpus() + 1; i++) {
404 struct list_head *list;
405 struct list_head *tmp;
406
407 list_for_each_safe(list, tmp, &cmgr->free_list[i]) {
408 struct bnx2fc_cmd *io_req = (struct bnx2fc_cmd *)list;
409 list_del(&io_req->link);
410 kfree(io_req);
411 }
412 }
413 kfree(cmgr->free_list);
414 free_cmgr:
415 /* Free command manager itself */
416 kfree(cmgr);
417 }
418
419 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
420 {
421 struct fcoe_port *port = tgt->port;
422 struct bnx2fc_hba *hba = port->priv;
423 struct bnx2fc_cmd_mgr *cmd_mgr = hba->cmd_mgr;
424 struct bnx2fc_cmd *io_req;
425 struct list_head *listp;
426 struct io_bdt *bd_tbl;
427 int index = RESERVE_FREE_LIST_INDEX;
428 u32 max_sqes;
429 u16 xid;
430
431 max_sqes = tgt->max_sqes;
432 switch (type) {
433 case BNX2FC_TASK_MGMT_CMD:
434 max_sqes = BNX2FC_TM_MAX_SQES;
435 break;
436 case BNX2FC_ELS:
437 max_sqes = BNX2FC_ELS_MAX_SQES;
438 break;
439 default:
440 break;
441 }
442
443 /*
444 * NOTE: Free list insertions and deletions are protected with
445 * cmgr lock
446 */
447 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
448 if ((list_empty(&(cmd_mgr->free_list[index]))) ||
449 (tgt->num_active_ios.counter >= max_sqes)) {
450 BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
451 "ios(%d):sqes(%d)\n",
452 tgt->num_active_ios.counter, tgt->max_sqes);
453 if (list_empty(&(cmd_mgr->free_list[index])))
454 printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
455 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
456 return NULL;
457 }
458
459 listp = (struct list_head *)
460 cmd_mgr->free_list[index].next;
461 list_del_init(listp);
462 io_req = (struct bnx2fc_cmd *) listp;
463 xid = io_req->xid;
464 cmd_mgr->cmds[xid] = io_req;
465 atomic_inc(&tgt->num_active_ios);
466 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
467
468 INIT_LIST_HEAD(&io_req->link);
469
470 io_req->port = port;
471 io_req->cmd_mgr = cmd_mgr;
472 io_req->req_flags = 0;
473 io_req->cmd_type = type;
474
475 /* Bind io_bdt for this io_req */
476 /* Have a static link between io_req and io_bdt_pool */
477 bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
478 bd_tbl->io_req = io_req;
479
480 /* Hold the io_req against deletion */
481 kref_init(&io_req->refcount);
482 return io_req;
483 }
484 static struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
485 {
486 struct fcoe_port *port = tgt->port;
487 struct bnx2fc_hba *hba = port->priv;
488 struct bnx2fc_cmd_mgr *cmd_mgr = hba->cmd_mgr;
489 struct bnx2fc_cmd *io_req;
490 struct list_head *listp;
491 struct io_bdt *bd_tbl;
492 u32 max_sqes;
493 u16 xid;
494 int index = get_cpu();
495
496 max_sqes = BNX2FC_SCSI_MAX_SQES;
497 /*
498 * NOTE: Free list insertions and deletions are protected with
499 * cmgr lock
500 */
501 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
502 if ((list_empty(&cmd_mgr->free_list[index])) ||
503 (tgt->num_active_ios.counter >= max_sqes)) {
504 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
505 put_cpu();
506 return NULL;
507 }
508
509 listp = (struct list_head *)
510 cmd_mgr->free_list[index].next;
511 list_del_init(listp);
512 io_req = (struct bnx2fc_cmd *) listp;
513 xid = io_req->xid;
514 cmd_mgr->cmds[xid] = io_req;
515 atomic_inc(&tgt->num_active_ios);
516 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
517 put_cpu();
518
519 INIT_LIST_HEAD(&io_req->link);
520
521 io_req->port = port;
522 io_req->cmd_mgr = cmd_mgr;
523 io_req->req_flags = 0;
524
525 /* Bind io_bdt for this io_req */
526 /* Have a static link between io_req and io_bdt_pool */
527 bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
528 bd_tbl->io_req = io_req;
529
530 /* Hold the io_req against deletion */
531 kref_init(&io_req->refcount);
532 return io_req;
533 }
534
535 void bnx2fc_cmd_release(struct kref *ref)
536 {
537 struct bnx2fc_cmd *io_req = container_of(ref,
538 struct bnx2fc_cmd, refcount);
539 struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
540 int index;
541
542 if (io_req->cmd_type == BNX2FC_SCSI_CMD)
543 index = io_req->xid % num_possible_cpus();
544 else
545 index = RESERVE_FREE_LIST_INDEX;
546
547
548 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
549 if (io_req->cmd_type != BNX2FC_SCSI_CMD)
550 bnx2fc_free_mp_resc(io_req);
551 cmd_mgr->cmds[io_req->xid] = NULL;
552 /* Delete IO from retire queue */
553 list_del_init(&io_req->link);
554 /* Add it to the free list */
555 list_add(&io_req->link,
556 &cmd_mgr->free_list[index]);
557 atomic_dec(&io_req->tgt->num_active_ios);
558 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
559
560 }
561
562 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
563 {
564 struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
565 struct bnx2fc_hba *hba = io_req->port->priv;
566 size_t sz = sizeof(struct fcoe_bd_ctx);
567
568 /* clear tm flags */
569 mp_req->tm_flags = 0;
570 if (mp_req->mp_req_bd) {
571 dma_free_coherent(&hba->pcidev->dev, sz,
572 mp_req->mp_req_bd,
573 mp_req->mp_req_bd_dma);
574 mp_req->mp_req_bd = NULL;
575 }
576 if (mp_req->mp_resp_bd) {
577 dma_free_coherent(&hba->pcidev->dev, sz,
578 mp_req->mp_resp_bd,
579 mp_req->mp_resp_bd_dma);
580 mp_req->mp_resp_bd = NULL;
581 }
582 if (mp_req->req_buf) {
583 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
584 mp_req->req_buf,
585 mp_req->req_buf_dma);
586 mp_req->req_buf = NULL;
587 }
588 if (mp_req->resp_buf) {
589 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
590 mp_req->resp_buf,
591 mp_req->resp_buf_dma);
592 mp_req->resp_buf = NULL;
593 }
594 }
595
596 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
597 {
598 struct bnx2fc_mp_req *mp_req;
599 struct fcoe_bd_ctx *mp_req_bd;
600 struct fcoe_bd_ctx *mp_resp_bd;
601 struct bnx2fc_hba *hba = io_req->port->priv;
602 dma_addr_t addr;
603 size_t sz;
604
605 mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
606 memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
607
608 mp_req->req_len = sizeof(struct fcp_cmnd);
609 io_req->data_xfer_len = mp_req->req_len;
610 mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
611 &mp_req->req_buf_dma,
612 GFP_ATOMIC);
613 if (!mp_req->req_buf) {
614 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
615 bnx2fc_free_mp_resc(io_req);
616 return FAILED;
617 }
618
619 mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
620 &mp_req->resp_buf_dma,
621 GFP_ATOMIC);
622 if (!mp_req->resp_buf) {
623 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
624 bnx2fc_free_mp_resc(io_req);
625 return FAILED;
626 }
627 memset(mp_req->req_buf, 0, PAGE_SIZE);
628 memset(mp_req->resp_buf, 0, PAGE_SIZE);
629
630 /* Allocate and map mp_req_bd and mp_resp_bd */
631 sz = sizeof(struct fcoe_bd_ctx);
632 mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
633 &mp_req->mp_req_bd_dma,
634 GFP_ATOMIC);
635 if (!mp_req->mp_req_bd) {
636 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
637 bnx2fc_free_mp_resc(io_req);
638 return FAILED;
639 }
640 mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
641 &mp_req->mp_resp_bd_dma,
642 GFP_ATOMIC);
643 if (!mp_req->mp_req_bd) {
644 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
645 bnx2fc_free_mp_resc(io_req);
646 return FAILED;
647 }
648 /* Fill bd table */
649 addr = mp_req->req_buf_dma;
650 mp_req_bd = mp_req->mp_req_bd;
651 mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
652 mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
653 mp_req_bd->buf_len = PAGE_SIZE;
654 mp_req_bd->flags = 0;
655
656 /*
657 * MP buffer is either a task mgmt command or an ELS.
658 * So the assumption is that it consumes a single bd
659 * entry in the bd table
660 */
661 mp_resp_bd = mp_req->mp_resp_bd;
662 addr = mp_req->resp_buf_dma;
663 mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
664 mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
665 mp_resp_bd->buf_len = PAGE_SIZE;
666 mp_resp_bd->flags = 0;
667
668 return SUCCESS;
669 }
670
671 static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
672 {
673 struct fc_lport *lport;
674 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
675 struct fc_rport_libfc_priv *rp = rport->dd_data;
676 struct fcoe_port *port;
677 struct bnx2fc_hba *hba;
678 struct bnx2fc_rport *tgt;
679 struct bnx2fc_cmd *io_req;
680 struct bnx2fc_mp_req *tm_req;
681 struct fcoe_task_ctx_entry *task;
682 struct fcoe_task_ctx_entry *task_page;
683 struct Scsi_Host *host = sc_cmd->device->host;
684 struct fc_frame_header *fc_hdr;
685 struct fcp_cmnd *fcp_cmnd;
686 int task_idx, index;
687 int rc = SUCCESS;
688 u16 xid;
689 u32 sid, did;
690 unsigned long start = jiffies;
691
692 lport = shost_priv(host);
693 port = lport_priv(lport);
694 hba = port->priv;
695
696 if (rport == NULL) {
697 printk(KERN_ALERT PFX "device_reset: rport is NULL\n");
698 rc = FAILED;
699 goto tmf_err;
700 }
701
702 rc = fc_block_scsi_eh(sc_cmd);
703 if (rc)
704 return rc;
705
706 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
707 printk(KERN_ERR PFX "device_reset: link is not ready\n");
708 rc = FAILED;
709 goto tmf_err;
710 }
711 /* rport and tgt are allocated together, so tgt should be non-NULL */
712 tgt = (struct bnx2fc_rport *)&rp[1];
713
714 if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
715 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
716 rc = FAILED;
717 goto tmf_err;
718 }
719 retry_tmf:
720 io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
721 if (!io_req) {
722 if (time_after(jiffies, start + HZ)) {
723 printk(KERN_ERR PFX "tmf: Failed TMF");
724 rc = FAILED;
725 goto tmf_err;
726 }
727 msleep(20);
728 goto retry_tmf;
729 }
730 /* Initialize rest of io_req fields */
731 io_req->sc_cmd = sc_cmd;
732 io_req->port = port;
733 io_req->tgt = tgt;
734
735 tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
736
737 rc = bnx2fc_init_mp_req(io_req);
738 if (rc == FAILED) {
739 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
740 kref_put(&io_req->refcount, bnx2fc_cmd_release);
741 goto tmf_err;
742 }
743
744 /* Set TM flags */
745 io_req->io_req_flags = 0;
746 tm_req->tm_flags = tm_flags;
747
748 /* Fill FCP_CMND */
749 bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
750 fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
751 memset(fcp_cmnd->fc_cdb, 0, sc_cmd->cmd_len);
752 fcp_cmnd->fc_dl = 0;
753
754 /* Fill FC header */
755 fc_hdr = &(tm_req->req_fc_hdr);
756 sid = tgt->sid;
757 did = rport->port_id;
758 __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
759 FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
760 FC_FC_SEQ_INIT, 0);
761 /* Obtain exchange id */
762 xid = io_req->xid;
763
764 BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
765 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
766 index = xid % BNX2FC_TASKS_PER_PAGE;
767
768 /* Initialize task context for this IO request */
769 task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
770 task = &(task_page[index]);
771 bnx2fc_init_mp_task(io_req, task);
772
773 sc_cmd->SCp.ptr = (char *)io_req;
774
775 /* Obtain free SQ entry */
776 spin_lock_bh(&tgt->tgt_lock);
777 bnx2fc_add_2_sq(tgt, xid);
778
779 /* Enqueue the io_req to active_tm_queue */
780 io_req->on_tmf_queue = 1;
781 list_add_tail(&io_req->link, &tgt->active_tm_queue);
782
783 init_completion(&io_req->tm_done);
784 io_req->wait_for_comp = 1;
785
786 /* Ring doorbell */
787 bnx2fc_ring_doorbell(tgt);
788 spin_unlock_bh(&tgt->tgt_lock);
789
790 rc = wait_for_completion_timeout(&io_req->tm_done,
791 BNX2FC_TM_TIMEOUT * HZ);
792 spin_lock_bh(&tgt->tgt_lock);
793
794 io_req->wait_for_comp = 0;
795 if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags)))
796 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
797
798 spin_unlock_bh(&tgt->tgt_lock);
799
800 if (!rc) {
801 printk(KERN_ERR PFX "task mgmt command failed...\n");
802 rc = FAILED;
803 } else {
804 printk(KERN_ERR PFX "task mgmt command success...\n");
805 rc = SUCCESS;
806 }
807 tmf_err:
808 return rc;
809 }
810
811 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
812 {
813 struct fc_lport *lport;
814 struct bnx2fc_rport *tgt = io_req->tgt;
815 struct fc_rport *rport = tgt->rport;
816 struct fc_rport_priv *rdata = tgt->rdata;
817 struct bnx2fc_hba *hba;
818 struct fcoe_port *port;
819 struct bnx2fc_cmd *abts_io_req;
820 struct fcoe_task_ctx_entry *task;
821 struct fcoe_task_ctx_entry *task_page;
822 struct fc_frame_header *fc_hdr;
823 struct bnx2fc_mp_req *abts_req;
824 int task_idx, index;
825 u32 sid, did;
826 u16 xid;
827 int rc = SUCCESS;
828 u32 r_a_tov = rdata->r_a_tov;
829
830 /* called with tgt_lock held */
831 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
832
833 port = io_req->port;
834 hba = port->priv;
835 lport = port->lport;
836
837 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
838 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
839 rc = FAILED;
840 goto abts_err;
841 }
842
843 if (rport == NULL) {
844 printk(KERN_ALERT PFX "initiate_abts: rport is NULL\n");
845 rc = FAILED;
846 goto abts_err;
847 }
848
849 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
850 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
851 rc = FAILED;
852 goto abts_err;
853 }
854
855 abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
856 if (!abts_io_req) {
857 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
858 rc = FAILED;
859 goto abts_err;
860 }
861
862 /* Initialize rest of io_req fields */
863 abts_io_req->sc_cmd = NULL;
864 abts_io_req->port = port;
865 abts_io_req->tgt = tgt;
866 abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
867
868 abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
869 memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
870
871 /* Fill FC header */
872 fc_hdr = &(abts_req->req_fc_hdr);
873
874 /* Obtain oxid and rxid for the original exchange to be aborted */
875 fc_hdr->fh_ox_id = htons(io_req->xid);
876 fc_hdr->fh_rx_id = htons(io_req->task->rx_wr_tx_rd.rx_id);
877
878 sid = tgt->sid;
879 did = rport->port_id;
880
881 __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
882 FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
883 FC_FC_SEQ_INIT, 0);
884
885 xid = abts_io_req->xid;
886 BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
887 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
888 index = xid % BNX2FC_TASKS_PER_PAGE;
889
890 /* Initialize task context for this IO request */
891 task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
892 task = &(task_page[index]);
893 bnx2fc_init_mp_task(abts_io_req, task);
894
895 /*
896 * ABTS task is a temporary task that will be cleaned up
897 * irrespective of ABTS response. We need to start the timer
898 * for the original exchange, as the CQE is posted for the original
899 * IO request.
900 *
901 * Timer for ABTS is started only when it is originated by a
902 * TM request. For the ABTS issued as part of ULP timeout,
903 * scsi-ml maintains the timers.
904 */
905
906 /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
907 bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
908
909 /* Obtain free SQ entry */
910 bnx2fc_add_2_sq(tgt, xid);
911
912 /* Ring doorbell */
913 bnx2fc_ring_doorbell(tgt);
914
915 abts_err:
916 return rc;
917 }
918
919 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
920 {
921 struct fc_lport *lport;
922 struct bnx2fc_rport *tgt = io_req->tgt;
923 struct bnx2fc_hba *hba;
924 struct fcoe_port *port;
925 struct bnx2fc_cmd *cleanup_io_req;
926 struct fcoe_task_ctx_entry *task;
927 struct fcoe_task_ctx_entry *task_page;
928 int task_idx, index;
929 u16 xid, orig_xid;
930 int rc = 0;
931
932 /* ASSUMPTION: called with tgt_lock held */
933 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
934
935 port = io_req->port;
936 hba = port->priv;
937 lport = port->lport;
938
939 cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
940 if (!cleanup_io_req) {
941 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
942 rc = -1;
943 goto cleanup_err;
944 }
945
946 /* Initialize rest of io_req fields */
947 cleanup_io_req->sc_cmd = NULL;
948 cleanup_io_req->port = port;
949 cleanup_io_req->tgt = tgt;
950 cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
951
952 xid = cleanup_io_req->xid;
953
954 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
955 index = xid % BNX2FC_TASKS_PER_PAGE;
956
957 /* Initialize task context for this IO request */
958 task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
959 task = &(task_page[index]);
960 orig_xid = io_req->xid;
961
962 BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
963
964 bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
965
966 /* Obtain free SQ entry */
967 bnx2fc_add_2_sq(tgt, xid);
968
969 /* Ring doorbell */
970 bnx2fc_ring_doorbell(tgt);
971
972 cleanup_err:
973 return rc;
974 }
975
976 /**
977 * bnx2fc_eh_target_reset: Reset a target
978 *
979 * @sc_cmd: SCSI command
980 *
981 * Set from SCSI host template to send task mgmt command to the target
982 * and wait for the response
983 */
984 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
985 {
986 return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
987 }
988
989 /**
990 * bnx2fc_eh_device_reset - Reset a single LUN
991 *
992 * @sc_cmd: SCSI command
993 *
994 * Set from SCSI host template to send task mgmt command to the target
995 * and wait for the response
996 */
997 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
998 {
999 return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1000 }
1001
1002 /**
1003 * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1004 * SCSI command
1005 *
1006 * @sc_cmd: SCSI_ML command pointer
1007 *
1008 * SCSI abort request handler
1009 */
1010 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1011 {
1012 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1013 struct fc_rport_libfc_priv *rp = rport->dd_data;
1014 struct bnx2fc_cmd *io_req;
1015 struct fc_lport *lport;
1016 struct bnx2fc_rport *tgt;
1017 int rc = FAILED;
1018
1019
1020 rc = fc_block_scsi_eh(sc_cmd);
1021 if (rc)
1022 return rc;
1023
1024 lport = shost_priv(sc_cmd->device->host);
1025 if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1026 printk(KERN_ALERT PFX "eh_abort: link not ready\n");
1027 return rc;
1028 }
1029
1030 tgt = (struct bnx2fc_rport *)&rp[1];
1031
1032 BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1033
1034 spin_lock_bh(&tgt->tgt_lock);
1035 io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1036 if (!io_req) {
1037 /* Command might have just completed */
1038 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1039 spin_unlock_bh(&tgt->tgt_lock);
1040 return SUCCESS;
1041 }
1042 BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1043 io_req->refcount.refcount.counter);
1044
1045 /* Hold IO request across abort processing */
1046 kref_get(&io_req->refcount);
1047
1048 BUG_ON(tgt != io_req->tgt);
1049
1050 /* Remove the io_req from the active_q. */
1051 /*
1052 * Task Mgmt functions (LUN RESET & TGT RESET) will not
1053 * issue an ABTS on this particular IO req, as the
1054 * io_req is no longer in the active_q.
1055 */
1056 if (tgt->flush_in_prog) {
1057 printk(KERN_ALERT PFX "eh_abort: io_req (xid = 0x%x) "
1058 "flush in progress\n", io_req->xid);
1059 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1060 spin_unlock_bh(&tgt->tgt_lock);
1061 return SUCCESS;
1062 }
1063
1064 if (io_req->on_active_queue == 0) {
1065 printk(KERN_ALERT PFX "eh_abort: io_req (xid = 0x%x) "
1066 "not on active_q\n", io_req->xid);
1067 /*
1068 * This condition can happen only due to the FW bug,
1069 * where we do not receive cleanup response from
1070 * the FW. Handle this case gracefully by erroring
1071 * back the IO request to SCSI-ml
1072 */
1073 bnx2fc_scsi_done(io_req, DID_ABORT);
1074
1075 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1076 spin_unlock_bh(&tgt->tgt_lock);
1077 return SUCCESS;
1078 }
1079
1080 /*
1081 * Only eh_abort processing will remove the IO from
1082 * active_cmd_q before processing the request. this is
1083 * done to avoid race conditions between IOs aborted
1084 * as part of task management completion and eh_abort
1085 * processing
1086 */
1087 list_del_init(&io_req->link);
1088 io_req->on_active_queue = 0;
1089 /* Move IO req to retire queue */
1090 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1091
1092 init_completion(&io_req->tm_done);
1093 io_req->wait_for_comp = 1;
1094
1095 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1096 /* Cancel the current timer running on this io_req */
1097 if (cancel_delayed_work(&io_req->timeout_work))
1098 kref_put(&io_req->refcount,
1099 bnx2fc_cmd_release); /* drop timer hold */
1100 set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1101 rc = bnx2fc_initiate_abts(io_req);
1102 } else {
1103 printk(KERN_ALERT PFX "eh_abort: io_req (xid = 0x%x) "
1104 "already in abts processing\n", io_req->xid);
1105 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1106 spin_unlock_bh(&tgt->tgt_lock);
1107 return SUCCESS;
1108 }
1109 if (rc == FAILED) {
1110 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1111 spin_unlock_bh(&tgt->tgt_lock);
1112 return rc;
1113 }
1114 spin_unlock_bh(&tgt->tgt_lock);
1115
1116 wait_for_completion(&io_req->tm_done);
1117
1118 spin_lock_bh(&tgt->tgt_lock);
1119 io_req->wait_for_comp = 0;
1120 if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1121 &io_req->req_flags))) {
1122 /* Let the scsi-ml try to recover this command */
1123 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1124 io_req->xid);
1125 rc = FAILED;
1126 } else {
1127 /*
1128 * We come here even when there was a race condition
1129 * between timeout and abts completion, and abts
1130 * completion happens just in time.
1131 */
1132 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1133 rc = SUCCESS;
1134 bnx2fc_scsi_done(io_req, DID_ABORT);
1135 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1136 }
1137
1138 /* release the reference taken in eh_abort */
1139 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1140 spin_unlock_bh(&tgt->tgt_lock);
1141 return rc;
1142 }
1143
1144 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1145 struct fcoe_task_ctx_entry *task,
1146 u8 num_rq)
1147 {
1148 BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1149 "refcnt = %d, cmd_type = %d\n",
1150 io_req->refcount.refcount.counter, io_req->cmd_type);
1151 bnx2fc_scsi_done(io_req, DID_ERROR);
1152 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1153 }
1154
1155 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1156 struct fcoe_task_ctx_entry *task,
1157 u8 num_rq)
1158 {
1159 u32 r_ctl;
1160 u32 r_a_tov = FC_DEF_R_A_TOV;
1161 u8 issue_rrq = 0;
1162 struct bnx2fc_rport *tgt = io_req->tgt;
1163
1164 BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1165 "refcnt = %d, cmd_type = %d\n",
1166 io_req->xid,
1167 io_req->refcount.refcount.counter, io_req->cmd_type);
1168
1169 if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1170 &io_req->req_flags)) {
1171 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1172 " this io\n");
1173 return;
1174 }
1175
1176 /* Do not issue RRQ as this IO is already cleanedup */
1177 if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1178 &io_req->req_flags))
1179 goto io_compl;
1180
1181 /*
1182 * For ABTS issued due to SCSI eh_abort_handler, timeout
1183 * values are maintained by scsi-ml itself. Cancel timeout
1184 * in case ABTS issued as part of task management function
1185 * or due to FW error.
1186 */
1187 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1188 if (cancel_delayed_work(&io_req->timeout_work))
1189 kref_put(&io_req->refcount,
1190 bnx2fc_cmd_release); /* drop timer hold */
1191
1192 r_ctl = task->cmn.general.rsp_info.abts_rsp.r_ctl;
1193
1194 switch (r_ctl) {
1195 case FC_RCTL_BA_ACC:
1196 /*
1197 * Dont release this cmd yet. It will be relesed
1198 * after we get RRQ response
1199 */
1200 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1201 issue_rrq = 1;
1202 break;
1203
1204 case FC_RCTL_BA_RJT:
1205 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1206 break;
1207 default:
1208 printk(KERN_ERR PFX "Unknown ABTS response\n");
1209 break;
1210 }
1211
1212 if (issue_rrq) {
1213 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1214 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1215 }
1216 set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1217 bnx2fc_cmd_timer_set(io_req, r_a_tov);
1218
1219 io_compl:
1220 if (io_req->wait_for_comp) {
1221 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1222 &io_req->req_flags))
1223 complete(&io_req->tm_done);
1224 } else {
1225 /*
1226 * We end up here when ABTS is issued as
1227 * in asynchronous context, i.e., as part
1228 * of task management completion, or
1229 * when FW error is received or when the
1230 * ABTS is issued when the IO is timed
1231 * out.
1232 */
1233
1234 if (io_req->on_active_queue) {
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 bnx2fc_scsi_done(io_req, DID_ERROR);
1241 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1242 }
1243 }
1244
1245 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1246 {
1247 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1248 struct bnx2fc_rport *tgt = io_req->tgt;
1249 struct list_head *list;
1250 struct list_head *tmp;
1251 struct bnx2fc_cmd *cmd;
1252 int tm_lun = sc_cmd->device->lun;
1253 int rc = 0;
1254 int lun;
1255
1256 /* called with tgt_lock held */
1257 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1258 /*
1259 * Walk thru the active_ios queue and ABORT the IO
1260 * that matches with the LUN that was reset
1261 */
1262 list_for_each_safe(list, tmp, &tgt->active_cmd_queue) {
1263 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1264 cmd = (struct bnx2fc_cmd *)list;
1265 lun = cmd->sc_cmd->device->lun;
1266 if (lun == tm_lun) {
1267 /* Initiate ABTS on this cmd */
1268 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1269 &cmd->req_flags)) {
1270 /* cancel the IO timeout */
1271 if (cancel_delayed_work(&io_req->timeout_work))
1272 kref_put(&io_req->refcount,
1273 bnx2fc_cmd_release);
1274 /* timer hold */
1275 rc = bnx2fc_initiate_abts(cmd);
1276 /* abts shouldn't fail in this context */
1277 WARN_ON(rc != SUCCESS);
1278 } else
1279 printk(KERN_ERR PFX "lun_rst: abts already in"
1280 " progress for this IO 0x%x\n",
1281 cmd->xid);
1282 }
1283 }
1284 }
1285
1286 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1287 {
1288 struct bnx2fc_rport *tgt = io_req->tgt;
1289 struct list_head *list;
1290 struct list_head *tmp;
1291 struct bnx2fc_cmd *cmd;
1292 int rc = 0;
1293
1294 /* called with tgt_lock held */
1295 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1296 /*
1297 * Walk thru the active_ios queue and ABORT the IO
1298 * that matches with the LUN that was reset
1299 */
1300 list_for_each_safe(list, tmp, &tgt->active_cmd_queue) {
1301 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1302 cmd = (struct bnx2fc_cmd *)list;
1303 /* Initiate ABTS */
1304 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1305 &cmd->req_flags)) {
1306 /* cancel the IO timeout */
1307 if (cancel_delayed_work(&io_req->timeout_work))
1308 kref_put(&io_req->refcount,
1309 bnx2fc_cmd_release); /* timer hold */
1310 rc = bnx2fc_initiate_abts(cmd);
1311 /* abts shouldn't fail in this context */
1312 WARN_ON(rc != SUCCESS);
1313
1314 } else
1315 printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1316 " for this IO 0x%x\n", cmd->xid);
1317 }
1318 }
1319
1320 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1321 struct fcoe_task_ctx_entry *task, u8 num_rq)
1322 {
1323 struct bnx2fc_mp_req *tm_req;
1324 struct fc_frame_header *fc_hdr;
1325 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1326 u64 *hdr;
1327 u64 *temp_hdr;
1328 void *rsp_buf;
1329
1330 /* Called with tgt_lock held */
1331 BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1332
1333 if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1334 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1335 else {
1336 /* TM has already timed out and we got
1337 * delayed completion. Ignore completion
1338 * processing.
1339 */
1340 return;
1341 }
1342
1343 tm_req = &(io_req->mp_req);
1344 fc_hdr = &(tm_req->resp_fc_hdr);
1345 hdr = (u64 *)fc_hdr;
1346 temp_hdr = (u64 *)
1347 &task->cmn.general.cmd_info.mp_fc_frame.fc_hdr;
1348 hdr[0] = cpu_to_be64(temp_hdr[0]);
1349 hdr[1] = cpu_to_be64(temp_hdr[1]);
1350 hdr[2] = cpu_to_be64(temp_hdr[2]);
1351
1352 tm_req->resp_len = task->rx_wr_only.sgl_ctx.mul_sges.cur_sge_off;
1353
1354 rsp_buf = tm_req->resp_buf;
1355
1356 if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1357 bnx2fc_parse_fcp_rsp(io_req,
1358 (struct fcoe_fcp_rsp_payload *)
1359 rsp_buf, num_rq);
1360 if (io_req->fcp_rsp_code == 0) {
1361 /* TM successful */
1362 if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1363 bnx2fc_lun_reset_cmpl(io_req);
1364 else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1365 bnx2fc_tgt_reset_cmpl(io_req);
1366 }
1367 } else {
1368 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1369 fc_hdr->fh_r_ctl);
1370 }
1371 if (!sc_cmd->SCp.ptr) {
1372 printk(KERN_ALERT PFX "tm_compl: SCp.ptr is NULL\n");
1373 return;
1374 }
1375 switch (io_req->fcp_status) {
1376 case FC_GOOD:
1377 if (io_req->cdb_status == 0) {
1378 /* Good IO completion */
1379 sc_cmd->result = DID_OK << 16;
1380 } else {
1381 /* Transport status is good, SCSI status not good */
1382 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1383 }
1384 if (io_req->fcp_resid)
1385 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1386 break;
1387
1388 default:
1389 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1390 io_req->fcp_status);
1391 break;
1392 }
1393
1394 sc_cmd = io_req->sc_cmd;
1395 io_req->sc_cmd = NULL;
1396
1397 /* check if the io_req exists in tgt's tmf_q */
1398 if (io_req->on_tmf_queue) {
1399
1400 list_del_init(&io_req->link);
1401 io_req->on_tmf_queue = 0;
1402 } else {
1403
1404 printk(KERN_ALERT PFX "Command not on active_cmd_queue!\n");
1405 return;
1406 }
1407
1408 sc_cmd->SCp.ptr = NULL;
1409 sc_cmd->scsi_done(sc_cmd);
1410
1411 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1412 if (io_req->wait_for_comp) {
1413 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1414 complete(&io_req->tm_done);
1415 }
1416 }
1417
1418 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1419 int bd_index)
1420 {
1421 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1422 int frag_size, sg_frags;
1423
1424 sg_frags = 0;
1425 while (sg_len) {
1426 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1427 frag_size = BNX2FC_BD_SPLIT_SZ;
1428 else
1429 frag_size = sg_len;
1430 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1431 bd[bd_index + sg_frags].buf_addr_hi = addr >> 32;
1432 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1433 bd[bd_index + sg_frags].flags = 0;
1434
1435 addr += (u64) frag_size;
1436 sg_frags++;
1437 sg_len -= frag_size;
1438 }
1439 return sg_frags;
1440
1441 }
1442
1443 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1444 {
1445 struct scsi_cmnd *sc = io_req->sc_cmd;
1446 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1447 struct scatterlist *sg;
1448 int byte_count = 0;
1449 int sg_count = 0;
1450 int bd_count = 0;
1451 int sg_frags;
1452 unsigned int sg_len;
1453 u64 addr;
1454 int i;
1455
1456 sg_count = scsi_dma_map(sc);
1457 scsi_for_each_sg(sc, sg, sg_count, i) {
1458 sg_len = sg_dma_len(sg);
1459 addr = sg_dma_address(sg);
1460 if (sg_len > BNX2FC_MAX_BD_LEN) {
1461 sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1462 bd_count);
1463 } else {
1464
1465 sg_frags = 1;
1466 bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1467 bd[bd_count].buf_addr_hi = addr >> 32;
1468 bd[bd_count].buf_len = (u16)sg_len;
1469 bd[bd_count].flags = 0;
1470 }
1471 bd_count += sg_frags;
1472 byte_count += sg_len;
1473 }
1474 if (byte_count != scsi_bufflen(sc))
1475 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1476 "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1477 io_req->xid);
1478 return bd_count;
1479 }
1480
1481 static void bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1482 {
1483 struct scsi_cmnd *sc = io_req->sc_cmd;
1484 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1485 int bd_count;
1486
1487 if (scsi_sg_count(sc))
1488 bd_count = bnx2fc_map_sg(io_req);
1489 else {
1490 bd_count = 0;
1491 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1492 bd[0].buf_len = bd[0].flags = 0;
1493 }
1494 io_req->bd_tbl->bd_valid = bd_count;
1495 }
1496
1497 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1498 {
1499 struct scsi_cmnd *sc = io_req->sc_cmd;
1500
1501 if (io_req->bd_tbl->bd_valid && sc) {
1502 scsi_dma_unmap(sc);
1503 io_req->bd_tbl->bd_valid = 0;
1504 }
1505 }
1506
1507 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1508 struct fcp_cmnd *fcp_cmnd)
1509 {
1510 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1511 char tag[2];
1512
1513 memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1514
1515 int_to_scsilun(sc_cmd->device->lun,
1516 (struct scsi_lun *) fcp_cmnd->fc_lun);
1517
1518
1519 fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1520 memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1521
1522 fcp_cmnd->fc_cmdref = 0;
1523 fcp_cmnd->fc_pri_ta = 0;
1524 fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1525 fcp_cmnd->fc_flags = io_req->io_req_flags;
1526
1527 if (scsi_populate_tag_msg(sc_cmd, tag)) {
1528 switch (tag[0]) {
1529 case HEAD_OF_QUEUE_TAG:
1530 fcp_cmnd->fc_pri_ta = FCP_PTA_HEADQ;
1531 break;
1532 case ORDERED_QUEUE_TAG:
1533 fcp_cmnd->fc_pri_ta = FCP_PTA_ORDERED;
1534 break;
1535 default:
1536 fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1537 break;
1538 }
1539 } else {
1540 fcp_cmnd->fc_pri_ta = 0;
1541 }
1542 }
1543
1544 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1545 struct fcoe_fcp_rsp_payload *fcp_rsp,
1546 u8 num_rq)
1547 {
1548 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1549 struct bnx2fc_rport *tgt = io_req->tgt;
1550 u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1551 u32 rq_buff_len = 0;
1552 int i;
1553 unsigned char *rq_data;
1554 unsigned char *dummy;
1555 int fcp_sns_len = 0;
1556 int fcp_rsp_len = 0;
1557
1558 io_req->fcp_status = FC_GOOD;
1559 io_req->fcp_resid = fcp_rsp->fcp_resid;
1560
1561 io_req->scsi_comp_flags = rsp_flags;
1562 CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1563 fcp_rsp->scsi_status_code;
1564
1565 /* Fetch fcp_rsp_info and fcp_sns_info if available */
1566 if (num_rq) {
1567
1568 /*
1569 * We do not anticipate num_rq >1, as the linux defined
1570 * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1571 * 256 bytes of single rq buffer is good enough to hold this.
1572 */
1573
1574 if (rsp_flags &
1575 FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1576 fcp_rsp_len = rq_buff_len
1577 = fcp_rsp->fcp_rsp_len;
1578 }
1579
1580 if (rsp_flags &
1581 FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1582 fcp_sns_len = fcp_rsp->fcp_sns_len;
1583 rq_buff_len += fcp_rsp->fcp_sns_len;
1584 }
1585
1586 io_req->fcp_rsp_len = fcp_rsp_len;
1587 io_req->fcp_sns_len = fcp_sns_len;
1588
1589 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1590 /* Invalid sense sense length. */
1591 printk(KERN_ALERT PFX "invalid sns length %d\n",
1592 rq_buff_len);
1593 /* reset rq_buff_len */
1594 rq_buff_len = num_rq * BNX2FC_RQ_BUF_SZ;
1595 }
1596
1597 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1598
1599 if (num_rq > 1) {
1600 /* We do not need extra sense data */
1601 for (i = 1; i < num_rq; i++)
1602 dummy = bnx2fc_get_next_rqe(tgt, 1);
1603 }
1604
1605 /* fetch fcp_rsp_code */
1606 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1607 /* Only for task management function */
1608 io_req->fcp_rsp_code = rq_data[3];
1609 printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1610 io_req->fcp_rsp_code);
1611 }
1612
1613 /* fetch sense data */
1614 rq_data += fcp_rsp_len;
1615
1616 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1617 printk(KERN_ERR PFX "Truncating sense buffer\n");
1618 fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1619 }
1620
1621 memset(sc_cmd->sense_buffer, 0, sizeof(sc_cmd->sense_buffer));
1622 if (fcp_sns_len)
1623 memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1624
1625 /* return RQ entries */
1626 for (i = 0; i < num_rq; i++)
1627 bnx2fc_return_rqe(tgt, 1);
1628 }
1629 }
1630
1631 /**
1632 * bnx2fc_queuecommand - Queuecommand function of the scsi template
1633 *
1634 * @host: The Scsi_Host the command was issued to
1635 * @sc_cmd: struct scsi_cmnd to be executed
1636 *
1637 * This is the IO strategy routine, called by SCSI-ML
1638 **/
1639 int bnx2fc_queuecommand(struct Scsi_Host *host,
1640 struct scsi_cmnd *sc_cmd)
1641 {
1642 struct fc_lport *lport = shost_priv(host);
1643 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1644 struct fc_rport_libfc_priv *rp = rport->dd_data;
1645 struct bnx2fc_rport *tgt;
1646 struct bnx2fc_cmd *io_req;
1647 int rc = 0;
1648 int rval;
1649
1650 rval = fc_remote_port_chkready(rport);
1651 if (rval) {
1652 sc_cmd->result = rval;
1653 sc_cmd->scsi_done(sc_cmd);
1654 return 0;
1655 }
1656
1657 if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1658 rc = SCSI_MLQUEUE_HOST_BUSY;
1659 goto exit_qcmd;
1660 }
1661
1662 /* rport and tgt are allocated together, so tgt should be non-NULL */
1663 tgt = (struct bnx2fc_rport *)&rp[1];
1664
1665 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1666 if (test_bit(BNX2FC_FLAG_UPLD_REQ_COMPL, &tgt->flags)) {
1667 sc_cmd->result = DID_NO_CONNECT << 16;
1668 sc_cmd->scsi_done(sc_cmd);
1669 return 0;
1670
1671 }
1672 /*
1673 * Session is not offloaded yet. Let SCSI-ml retry
1674 * the command.
1675 */
1676 rc = SCSI_MLQUEUE_TARGET_BUSY;
1677 goto exit_qcmd;
1678 }
1679
1680 io_req = bnx2fc_cmd_alloc(tgt);
1681 if (!io_req) {
1682 rc = SCSI_MLQUEUE_HOST_BUSY;
1683 goto exit_qcmd;
1684 }
1685 io_req->sc_cmd = sc_cmd;
1686
1687 if (bnx2fc_post_io_req(tgt, io_req)) {
1688 printk(KERN_ERR PFX "Unable to post io_req\n");
1689 rc = SCSI_MLQUEUE_HOST_BUSY;
1690 goto exit_qcmd;
1691 }
1692 exit_qcmd:
1693 return rc;
1694 }
1695
1696 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1697 struct fcoe_task_ctx_entry *task,
1698 u8 num_rq)
1699 {
1700 struct fcoe_fcp_rsp_payload *fcp_rsp;
1701 struct bnx2fc_rport *tgt = io_req->tgt;
1702 struct scsi_cmnd *sc_cmd;
1703 struct Scsi_Host *host;
1704
1705
1706 /* scsi_cmd_cmpl is called with tgt lock held */
1707
1708 if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1709 /* we will not receive ABTS response for this IO */
1710 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1711 "this scsi cmd\n");
1712 }
1713
1714 /* Cancel the timeout_work, as we received IO completion */
1715 if (cancel_delayed_work(&io_req->timeout_work))
1716 kref_put(&io_req->refcount,
1717 bnx2fc_cmd_release); /* drop timer hold */
1718
1719 sc_cmd = io_req->sc_cmd;
1720 if (sc_cmd == NULL) {
1721 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1722 return;
1723 }
1724
1725 /* Fetch fcp_rsp from task context and perform cmd completion */
1726 fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1727 &(task->cmn.general.rsp_info.fcp_rsp.payload);
1728
1729 /* parse fcp_rsp and obtain sense data from RQ if available */
1730 bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1731
1732 host = sc_cmd->device->host;
1733 if (!sc_cmd->SCp.ptr) {
1734 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1735 return;
1736 }
1737 io_req->sc_cmd = NULL;
1738
1739 if (io_req->on_active_queue) {
1740 list_del_init(&io_req->link);
1741 io_req->on_active_queue = 0;
1742 /* Move IO req to retire queue */
1743 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1744 } else {
1745 /* This should not happen, but could have been pulled
1746 * by bnx2fc_flush_active_ios(), or during a race
1747 * between command abort and (late) completion.
1748 */
1749 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1750 if (io_req->wait_for_comp)
1751 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1752 &io_req->req_flags))
1753 complete(&io_req->tm_done);
1754 }
1755
1756 bnx2fc_unmap_sg_list(io_req);
1757
1758 switch (io_req->fcp_status) {
1759 case FC_GOOD:
1760 if (io_req->cdb_status == 0) {
1761 /* Good IO completion */
1762 sc_cmd->result = DID_OK << 16;
1763 } else {
1764 /* Transport status is good, SCSI status not good */
1765 BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1766 " fcp_resid = 0x%x\n",
1767 io_req->cdb_status, io_req->fcp_resid);
1768 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1769 }
1770 if (io_req->fcp_resid)
1771 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1772 break;
1773 default:
1774 printk(KERN_ALERT PFX "scsi_cmd_compl: fcp_status = %d\n",
1775 io_req->fcp_status);
1776 break;
1777 }
1778 sc_cmd->SCp.ptr = NULL;
1779 sc_cmd->scsi_done(sc_cmd);
1780 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1781 }
1782
1783 static int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1784 struct bnx2fc_cmd *io_req)
1785 {
1786 struct fcoe_task_ctx_entry *task;
1787 struct fcoe_task_ctx_entry *task_page;
1788 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1789 struct fcoe_port *port = tgt->port;
1790 struct bnx2fc_hba *hba = port->priv;
1791 struct fc_lport *lport = port->lport;
1792 struct fcoe_dev_stats *stats;
1793 int task_idx, index;
1794 u16 xid;
1795
1796 /* Initialize rest of io_req fields */
1797 io_req->cmd_type = BNX2FC_SCSI_CMD;
1798 io_req->port = port;
1799 io_req->tgt = tgt;
1800 io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1801 sc_cmd->SCp.ptr = (char *)io_req;
1802
1803 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1804 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1805 io_req->io_req_flags = BNX2FC_READ;
1806 stats->InputRequests++;
1807 stats->InputBytes += io_req->data_xfer_len;
1808 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1809 io_req->io_req_flags = BNX2FC_WRITE;
1810 stats->OutputRequests++;
1811 stats->OutputBytes += io_req->data_xfer_len;
1812 } else {
1813 io_req->io_req_flags = 0;
1814 stats->ControlRequests++;
1815 }
1816 put_cpu();
1817
1818 xid = io_req->xid;
1819
1820 /* Build buffer descriptor list for firmware from sg list */
1821 bnx2fc_build_bd_list_from_sg(io_req);
1822
1823 task_idx = xid / BNX2FC_TASKS_PER_PAGE;
1824 index = xid % BNX2FC_TASKS_PER_PAGE;
1825
1826 /* Initialize task context for this IO request */
1827 task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
1828 task = &(task_page[index]);
1829 bnx2fc_init_task(io_req, task);
1830
1831 spin_lock_bh(&tgt->tgt_lock);
1832
1833 if (tgt->flush_in_prog) {
1834 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
1835 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1836 spin_unlock_bh(&tgt->tgt_lock);
1837 return -EAGAIN;
1838 }
1839
1840 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1841 printk(KERN_ERR PFX "Session not ready...post_io\n");
1842 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1843 spin_unlock_bh(&tgt->tgt_lock);
1844 return -EAGAIN;
1845 }
1846
1847 /* Time IO req */
1848 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
1849 /* Obtain free SQ entry */
1850 bnx2fc_add_2_sq(tgt, xid);
1851
1852 /* Enqueue the io_req to active_cmd_queue */
1853
1854 io_req->on_active_queue = 1;
1855 /* move io_req from pending_queue to active_queue */
1856 list_add_tail(&io_req->link, &tgt->active_cmd_queue);
1857
1858 /* Ring doorbell */
1859 bnx2fc_ring_doorbell(tgt);
1860 spin_unlock_bh(&tgt->tgt_lock);
1861 return 0;
1862 }