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net: dsa: mv88e6xxx: extract single VLAN retrieval
[linux-2.6/btrfs-unstable.git] / drivers / scsi / bnx2fc / bnx2fc_io.c
blob0002caf687dd027f959e76e3e64cac52b7ded11d
1 /* bnx2fc_io.c: QLogic Linux FCoE offload driver.
2 * IO manager and SCSI IO processing.
3 *
4 * Copyright (c) 2008-2013 Broadcom Corporation
5 * Copyright (c) 2014-2015 QLogic Corporation
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation.
10 *
11 * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
12 */
13
14 #include "bnx2fc.h"
15
16 #define RESERVE_FREE_LIST_INDEX num_possible_cpus()
17
18 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
19 int bd_index);
20 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
21 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
22 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
23 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
24 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
25 struct fcoe_fcp_rsp_payload *fcp_rsp,
26 u8 num_rq);
27
28 void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
29 unsigned int timer_msec)
30 {
31 struct bnx2fc_interface *interface = io_req->port->priv;
32
33 if (queue_delayed_work(interface->timer_work_queue,
34 &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 u8 cmd_type = io_req->cmd_type;
44 struct bnx2fc_rport *tgt = io_req->tgt;
45 int rc;
46
47 BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
48 "req_flags = %lx\n", cmd_type, io_req->req_flags);
49
50 spin_lock_bh(&tgt->tgt_lock);
51 if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
52 clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
53 /*
54 * ideally we should hold the io_req until RRQ complets,
55 * and release io_req from timeout hold.
56 */
57 spin_unlock_bh(&tgt->tgt_lock);
58 bnx2fc_send_rrq(io_req);
59 return;
60 }
61 if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
62 BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
63 goto done;
64 }
65
66 switch (cmd_type) {
67 case BNX2FC_SCSI_CMD:
68 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
69 &io_req->req_flags)) {
70 /* Handle eh_abort timeout */
71 BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
72 complete(&io_req->tm_done);
73 } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
74 &io_req->req_flags)) {
75 /* Handle internally generated ABTS timeout */
76 BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
77 io_req->refcount.refcount.counter);
78 if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
79 &io_req->req_flags))) {
80 /*
81 * Cleanup and return original command to
82 * mid-layer.
83 */
84 bnx2fc_initiate_cleanup(io_req);
85 kref_put(&io_req->refcount, bnx2fc_cmd_release);
86 spin_unlock_bh(&tgt->tgt_lock);
87
88 return;
89 }
90 } else {
91 /* Hanlde IO timeout */
92 BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
93 if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
94 &io_req->req_flags)) {
95 BNX2FC_IO_DBG(io_req, "IO completed before "
96 " timer expiry\n");
97 goto done;
98 }
99
100 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
101 &io_req->req_flags)) {
102 rc = bnx2fc_initiate_abts(io_req);
103 if (rc == SUCCESS)
104 goto done;
105
106 kref_put(&io_req->refcount, bnx2fc_cmd_release);
107 spin_unlock_bh(&tgt->tgt_lock);
108
109 return;
110 } else {
111 BNX2FC_IO_DBG(io_req, "IO already in "
112 "ABTS processing\n");
113 }
114 }
115 break;
116 case BNX2FC_ELS:
117
118 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
119 BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
120
121 if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
122 &io_req->req_flags)) {
123 kref_put(&io_req->refcount, bnx2fc_cmd_release);
124 spin_unlock_bh(&tgt->tgt_lock);
125
126 return;
127 }
128 } else {
129 /*
130 * Handle ELS timeout.
131 * tgt_lock is used to sync compl path and timeout
132 * path. If els compl path is processing this IO, we
133 * have nothing to do here, just release the timer hold
134 */
135 BNX2FC_IO_DBG(io_req, "ELS timed out\n");
136 if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
137 &io_req->req_flags))
138 goto done;
139
140 /* Indicate the cb_func that this ELS is timed out */
141 set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
142
143 if ((io_req->cb_func) && (io_req->cb_arg)) {
144 io_req->cb_func(io_req->cb_arg);
145 io_req->cb_arg = NULL;
146 }
147 }
148 break;
149 default:
150 printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
151 cmd_type);
152 break;
153 }
154
155 done:
156 /* release the cmd that was held when timer was set */
157 kref_put(&io_req->refcount, bnx2fc_cmd_release);
158 spin_unlock_bh(&tgt->tgt_lock);
159 }
160
161 static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
162 {
163 /* Called with host lock held */
164 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
165
166 /*
167 * active_cmd_queue may have other command types as well,
168 * and during flush operation, we want to error back only
169 * scsi commands.
170 */
171 if (io_req->cmd_type != BNX2FC_SCSI_CMD)
172 return;
173
174 BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
175 if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
176 /* Do not call scsi done for this IO */
177 return;
178 }
179
180 bnx2fc_unmap_sg_list(io_req);
181 io_req->sc_cmd = NULL;
182 if (!sc_cmd) {
183 printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
184 "IO(0x%x) already cleaned up\n",
185 io_req->xid);
186 return;
187 }
188 sc_cmd->result = err_code << 16;
189
190 BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
191 sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
192 sc_cmd->allowed);
193 scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
194 sc_cmd->SCp.ptr = NULL;
195 sc_cmd->scsi_done(sc_cmd);
196 }
197
198 struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
199 {
200 struct bnx2fc_cmd_mgr *cmgr;
201 struct io_bdt *bdt_info;
202 struct bnx2fc_cmd *io_req;
203 size_t len;
204 u32 mem_size;
205 u16 xid;
206 int i;
207 int num_ios, num_pri_ios;
208 size_t bd_tbl_sz;
209 int arr_sz = num_possible_cpus() + 1;
210 u16 min_xid = BNX2FC_MIN_XID;
211 u16 max_xid = hba->max_xid;
212
213 if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
214 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
215 and max_xid 0x%x\n", min_xid, max_xid);
216 return NULL;
217 }
218 BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
219
220 num_ios = max_xid - min_xid + 1;
221 len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
222 len += sizeof(struct bnx2fc_cmd_mgr);
223
224 cmgr = kzalloc(len, GFP_KERNEL);
225 if (!cmgr) {
226 printk(KERN_ERR PFX "failed to alloc cmgr\n");
227 return NULL;
228 }
229
230 cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
231 arr_sz, GFP_KERNEL);
232 if (!cmgr->free_list) {
233 printk(KERN_ERR PFX "failed to alloc free_list\n");
234 goto mem_err;
235 }
236
237 cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
238 arr_sz, GFP_KERNEL);
239 if (!cmgr->free_list_lock) {
240 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
241 kfree(cmgr->free_list);
242 cmgr->free_list = NULL;
243 goto mem_err;
244 }
245
246 cmgr->hba = hba;
247 cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
248
249 for (i = 0; i < arr_sz; i++) {
250 INIT_LIST_HEAD(&cmgr->free_list[i]);
251 spin_lock_init(&cmgr->free_list_lock[i]);
252 }
253
254 /*
255 * Pre-allocated pool of bnx2fc_cmds.
256 * Last entry in the free list array is the free list
257 * of slow path requests.
258 */
259 xid = BNX2FC_MIN_XID;
260 num_pri_ios = num_ios - hba->elstm_xids;
261 for (i = 0; i < num_ios; i++) {
262 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
263
264 if (!io_req) {
265 printk(KERN_ERR PFX "failed to alloc io_req\n");
266 goto mem_err;
267 }
268
269 INIT_LIST_HEAD(&io_req->link);
270 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
271
272 io_req->xid = xid++;
273 if (i < num_pri_ios)
274 list_add_tail(&io_req->link,
275 &cmgr->free_list[io_req->xid %
276 num_possible_cpus()]);
277 else
278 list_add_tail(&io_req->link,
279 &cmgr->free_list[num_possible_cpus()]);
280 io_req++;
281 }
282
283 /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
284 mem_size = num_ios * sizeof(struct io_bdt *);
285 cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
286 if (!cmgr->io_bdt_pool) {
287 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
288 goto mem_err;
289 }
290
291 mem_size = sizeof(struct io_bdt);
292 for (i = 0; i < num_ios; i++) {
293 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
294 if (!cmgr->io_bdt_pool[i]) {
295 printk(KERN_ERR PFX "failed to alloc "
296 "io_bdt_pool[%d]\n", i);
297 goto mem_err;
298 }
299 }
300
301 /* Allocate an map fcoe_bdt_ctx structures */
302 bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
303 for (i = 0; i < num_ios; i++) {
304 bdt_info = cmgr->io_bdt_pool[i];
305 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
306 bd_tbl_sz,
307 &bdt_info->bd_tbl_dma,
308 GFP_KERNEL);
309 if (!bdt_info->bd_tbl) {
310 printk(KERN_ERR PFX "failed to alloc "
311 "bdt_tbl[%d]\n", i);
312 goto mem_err;
313 }
314 }
315
316 return cmgr;
317
318 mem_err:
319 bnx2fc_cmd_mgr_free(cmgr);
320 return NULL;
321 }
322
323 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
324 {
325 struct io_bdt *bdt_info;
326 struct bnx2fc_hba *hba = cmgr->hba;
327 size_t bd_tbl_sz;
328 u16 min_xid = BNX2FC_MIN_XID;
329 u16 max_xid = hba->max_xid;
330 int num_ios;
331 int i;
332
333 num_ios = max_xid - min_xid + 1;
334
335 /* Free fcoe_bdt_ctx structures */
336 if (!cmgr->io_bdt_pool)
337 goto free_cmd_pool;
338
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 if (bdt_info->bd_tbl) {
343 dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
344 bdt_info->bd_tbl,
345 bdt_info->bd_tbl_dma);
346 bdt_info->bd_tbl = NULL;
347 }
348 }
349
350 /* Destroy io_bdt pool */
351 for (i = 0; i < num_ios; i++) {
352 kfree(cmgr->io_bdt_pool[i]);
353 cmgr->io_bdt_pool[i] = NULL;
354 }
355
356 kfree(cmgr->io_bdt_pool);
357 cmgr->io_bdt_pool = NULL;
358
359 free_cmd_pool:
360 kfree(cmgr->free_list_lock);
361
362 /* Destroy cmd pool */
363 if (!cmgr->free_list)
364 goto free_cmgr;
365
366 for (i = 0; i < num_possible_cpus() + 1; i++) {
367 struct bnx2fc_cmd *tmp, *io_req;
368
369 list_for_each_entry_safe(io_req, tmp,
370 &cmgr->free_list[i], link) {
371 list_del(&io_req->link);
372 kfree(io_req);
373 }
374 }
375 kfree(cmgr->free_list);
376 free_cmgr:
377 /* Free command manager itself */
378 kfree(cmgr);
379 }
380
381 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
382 {
383 struct fcoe_port *port = tgt->port;
384 struct bnx2fc_interface *interface = port->priv;
385 struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
386 struct bnx2fc_cmd *io_req;
387 struct list_head *listp;
388 struct io_bdt *bd_tbl;
389 int index = RESERVE_FREE_LIST_INDEX;
390 u32 free_sqes;
391 u32 max_sqes;
392 u16 xid;
393
394 max_sqes = tgt->max_sqes;
395 switch (type) {
396 case BNX2FC_TASK_MGMT_CMD:
397 max_sqes = BNX2FC_TM_MAX_SQES;
398 break;
399 case BNX2FC_ELS:
400 max_sqes = BNX2FC_ELS_MAX_SQES;
401 break;
402 default:
403 break;
404 }
405
406 /*
407 * NOTE: Free list insertions and deletions are protected with
408 * cmgr lock
409 */
410 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
411 free_sqes = atomic_read(&tgt->free_sqes);
412 if ((list_empty(&(cmd_mgr->free_list[index]))) ||
413 (tgt->num_active_ios.counter >= max_sqes) ||
414 (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
415 BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
416 "ios(%d):sqes(%d)\n",
417 tgt->num_active_ios.counter, tgt->max_sqes);
418 if (list_empty(&(cmd_mgr->free_list[index])))
419 printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
420 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
421 return NULL;
422 }
423
424 listp = (struct list_head *)
425 cmd_mgr->free_list[index].next;
426 list_del_init(listp);
427 io_req = (struct bnx2fc_cmd *) listp;
428 xid = io_req->xid;
429 cmd_mgr->cmds[xid] = io_req;
430 atomic_inc(&tgt->num_active_ios);
431 atomic_dec(&tgt->free_sqes);
432 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
433
434 INIT_LIST_HEAD(&io_req->link);
435
436 io_req->port = port;
437 io_req->cmd_mgr = cmd_mgr;
438 io_req->req_flags = 0;
439 io_req->cmd_type = type;
440
441 /* Bind io_bdt for this io_req */
442 /* Have a static link between io_req and io_bdt_pool */
443 bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
444 bd_tbl->io_req = io_req;
445
446 /* Hold the io_req against deletion */
447 kref_init(&io_req->refcount);
448 return io_req;
449 }
450
451 struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
452 {
453 struct fcoe_port *port = tgt->port;
454 struct bnx2fc_interface *interface = port->priv;
455 struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
456 struct bnx2fc_cmd *io_req;
457 struct list_head *listp;
458 struct io_bdt *bd_tbl;
459 u32 free_sqes;
460 u32 max_sqes;
461 u16 xid;
462 int index = get_cpu();
463
464 max_sqes = BNX2FC_SCSI_MAX_SQES;
465 /*
466 * NOTE: Free list insertions and deletions are protected with
467 * cmgr lock
468 */
469 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
470 free_sqes = atomic_read(&tgt->free_sqes);
471 if ((list_empty(&cmd_mgr->free_list[index])) ||
472 (tgt->num_active_ios.counter >= max_sqes) ||
473 (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
474 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
475 put_cpu();
476 return NULL;
477 }
478
479 listp = (struct list_head *)
480 cmd_mgr->free_list[index].next;
481 list_del_init(listp);
482 io_req = (struct bnx2fc_cmd *) listp;
483 xid = io_req->xid;
484 cmd_mgr->cmds[xid] = io_req;
485 atomic_inc(&tgt->num_active_ios);
486 atomic_dec(&tgt->free_sqes);
487 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
488 put_cpu();
489
490 INIT_LIST_HEAD(&io_req->link);
491
492 io_req->port = port;
493 io_req->cmd_mgr = cmd_mgr;
494 io_req->req_flags = 0;
495
496 /* Bind io_bdt for this io_req */
497 /* Have a static link between io_req and io_bdt_pool */
498 bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
499 bd_tbl->io_req = io_req;
500
501 /* Hold the io_req against deletion */
502 kref_init(&io_req->refcount);
503 return io_req;
504 }
505
506 void bnx2fc_cmd_release(struct kref *ref)
507 {
508 struct bnx2fc_cmd *io_req = container_of(ref,
509 struct bnx2fc_cmd, refcount);
510 struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
511 int index;
512
513 if (io_req->cmd_type == BNX2FC_SCSI_CMD)
514 index = io_req->xid % num_possible_cpus();
515 else
516 index = RESERVE_FREE_LIST_INDEX;
517
518
519 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
520 if (io_req->cmd_type != BNX2FC_SCSI_CMD)
521 bnx2fc_free_mp_resc(io_req);
522 cmd_mgr->cmds[io_req->xid] = NULL;
523 /* Delete IO from retire queue */
524 list_del_init(&io_req->link);
525 /* Add it to the free list */
526 list_add(&io_req->link,
527 &cmd_mgr->free_list[index]);
528 atomic_dec(&io_req->tgt->num_active_ios);
529 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
530
531 }
532
533 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
534 {
535 struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
536 struct bnx2fc_interface *interface = io_req->port->priv;
537 struct bnx2fc_hba *hba = interface->hba;
538 size_t sz = sizeof(struct fcoe_bd_ctx);
539
540 /* clear tm flags */
541 mp_req->tm_flags = 0;
542 if (mp_req->mp_req_bd) {
543 dma_free_coherent(&hba->pcidev->dev, sz,
544 mp_req->mp_req_bd,
545 mp_req->mp_req_bd_dma);
546 mp_req->mp_req_bd = NULL;
547 }
548 if (mp_req->mp_resp_bd) {
549 dma_free_coherent(&hba->pcidev->dev, sz,
550 mp_req->mp_resp_bd,
551 mp_req->mp_resp_bd_dma);
552 mp_req->mp_resp_bd = NULL;
553 }
554 if (mp_req->req_buf) {
555 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
556 mp_req->req_buf,
557 mp_req->req_buf_dma);
558 mp_req->req_buf = NULL;
559 }
560 if (mp_req->resp_buf) {
561 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
562 mp_req->resp_buf,
563 mp_req->resp_buf_dma);
564 mp_req->resp_buf = NULL;
565 }
566 }
567
568 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
569 {
570 struct bnx2fc_mp_req *mp_req;
571 struct fcoe_bd_ctx *mp_req_bd;
572 struct fcoe_bd_ctx *mp_resp_bd;
573 struct bnx2fc_interface *interface = io_req->port->priv;
574 struct bnx2fc_hba *hba = interface->hba;
575 dma_addr_t addr;
576 size_t sz;
577
578 mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
579 memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
580
581 if (io_req->cmd_type != BNX2FC_ELS) {
582 mp_req->req_len = sizeof(struct fcp_cmnd);
583 io_req->data_xfer_len = mp_req->req_len;
584 } else
585 mp_req->req_len = io_req->data_xfer_len;
586
587 mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
588 &mp_req->req_buf_dma,
589 GFP_ATOMIC);
590 if (!mp_req->req_buf) {
591 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
592 bnx2fc_free_mp_resc(io_req);
593 return FAILED;
594 }
595
596 mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
597 &mp_req->resp_buf_dma,
598 GFP_ATOMIC);
599 if (!mp_req->resp_buf) {
600 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
601 bnx2fc_free_mp_resc(io_req);
602 return FAILED;
603 }
604 memset(mp_req->req_buf, 0, CNIC_PAGE_SIZE);
605 memset(mp_req->resp_buf, 0, CNIC_PAGE_SIZE);
606
607 /* Allocate and map mp_req_bd and mp_resp_bd */
608 sz = sizeof(struct fcoe_bd_ctx);
609 mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
610 &mp_req->mp_req_bd_dma,
611 GFP_ATOMIC);
612 if (!mp_req->mp_req_bd) {
613 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
614 bnx2fc_free_mp_resc(io_req);
615 return FAILED;
616 }
617 mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
618 &mp_req->mp_resp_bd_dma,
619 GFP_ATOMIC);
620 if (!mp_req->mp_resp_bd) {
621 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
622 bnx2fc_free_mp_resc(io_req);
623 return FAILED;
624 }
625 /* Fill bd table */
626 addr = mp_req->req_buf_dma;
627 mp_req_bd = mp_req->mp_req_bd;
628 mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
629 mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
630 mp_req_bd->buf_len = CNIC_PAGE_SIZE;
631 mp_req_bd->flags = 0;
632
633 /*
634 * MP buffer is either a task mgmt command or an ELS.
635 * So the assumption is that it consumes a single bd
636 * entry in the bd table
637 */
638 mp_resp_bd = mp_req->mp_resp_bd;
639 addr = mp_req->resp_buf_dma;
640 mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
641 mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
642 mp_resp_bd->buf_len = CNIC_PAGE_SIZE;
643 mp_resp_bd->flags = 0;
644
645 return SUCCESS;
646 }
647
648 static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
649 {
650 struct fc_lport *lport;
651 struct fc_rport *rport;
652 struct fc_rport_libfc_priv *rp;
653 struct fcoe_port *port;
654 struct bnx2fc_interface *interface;
655 struct bnx2fc_rport *tgt;
656 struct bnx2fc_cmd *io_req;
657 struct bnx2fc_mp_req *tm_req;
658 struct fcoe_task_ctx_entry *task;
659 struct fcoe_task_ctx_entry *task_page;
660 struct Scsi_Host *host = sc_cmd->device->host;
661 struct fc_frame_header *fc_hdr;
662 struct fcp_cmnd *fcp_cmnd;
663 int task_idx, index;
664 int rc = SUCCESS;
665 u16 xid;
666 u32 sid, did;
667 unsigned long start = jiffies;
668
669 lport = shost_priv(host);
670 rport = starget_to_rport(scsi_target(sc_cmd->device));
671 port = lport_priv(lport);
672 interface = port->priv;
673
674 if (rport == NULL) {
675 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
676 rc = FAILED;
677 goto tmf_err;
678 }
679 rp = rport->dd_data;
680
681 rc = fc_block_scsi_eh(sc_cmd);
682 if (rc)
683 return rc;
684
685 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
686 printk(KERN_ERR PFX "device_reset: link is not ready\n");
687 rc = FAILED;
688 goto tmf_err;
689 }
690 /* rport and tgt are allocated together, so tgt should be non-NULL */
691 tgt = (struct bnx2fc_rport *)&rp[1];
692
693 if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
694 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
695 rc = FAILED;
696 goto tmf_err;
697 }
698 retry_tmf:
699 io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
700 if (!io_req) {
701 if (time_after(jiffies, start + HZ)) {
702 printk(KERN_ERR PFX "tmf: Failed TMF");
703 rc = FAILED;
704 goto tmf_err;
705 }
706 msleep(20);
707 goto retry_tmf;
708 }
709 /* Initialize rest of io_req fields */
710 io_req->sc_cmd = sc_cmd;
711 io_req->port = port;
712 io_req->tgt = tgt;
713
714 tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
715
716 rc = bnx2fc_init_mp_req(io_req);
717 if (rc == FAILED) {
718 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
719 spin_lock_bh(&tgt->tgt_lock);
720 kref_put(&io_req->refcount, bnx2fc_cmd_release);
721 spin_unlock_bh(&tgt->tgt_lock);
722 goto tmf_err;
723 }
724
725 /* Set TM flags */
726 io_req->io_req_flags = 0;
727 tm_req->tm_flags = tm_flags;
728
729 /* Fill FCP_CMND */
730 bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
731 fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
732 memset(fcp_cmnd->fc_cdb, 0, sc_cmd->cmd_len);
733 fcp_cmnd->fc_dl = 0;
734
735 /* Fill FC header */
736 fc_hdr = &(tm_req->req_fc_hdr);
737 sid = tgt->sid;
738 did = rport->port_id;
739 __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
740 FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
741 FC_FC_SEQ_INIT, 0);
742 /* Obtain exchange id */
743 xid = io_req->xid;
744
745 BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
746 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
747 index = xid % BNX2FC_TASKS_PER_PAGE;
748
749 /* Initialize task context for this IO request */
750 task_page = (struct fcoe_task_ctx_entry *)
751 interface->hba->task_ctx[task_idx];
752 task = &(task_page[index]);
753 bnx2fc_init_mp_task(io_req, task);
754
755 sc_cmd->SCp.ptr = (char *)io_req;
756
757 /* Obtain free SQ entry */
758 spin_lock_bh(&tgt->tgt_lock);
759 bnx2fc_add_2_sq(tgt, xid);
760
761 /* Enqueue the io_req to active_tm_queue */
762 io_req->on_tmf_queue = 1;
763 list_add_tail(&io_req->link, &tgt->active_tm_queue);
764
765 init_completion(&io_req->tm_done);
766 io_req->wait_for_comp = 1;
767
768 /* Ring doorbell */
769 bnx2fc_ring_doorbell(tgt);
770 spin_unlock_bh(&tgt->tgt_lock);
771
772 rc = wait_for_completion_timeout(&io_req->tm_done,
773 BNX2FC_TM_TIMEOUT * HZ);
774 spin_lock_bh(&tgt->tgt_lock);
775
776 io_req->wait_for_comp = 0;
777 if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
778 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
779 if (io_req->on_tmf_queue) {
780 list_del_init(&io_req->link);
781 io_req->on_tmf_queue = 0;
782 }
783 io_req->wait_for_comp = 1;
784 bnx2fc_initiate_cleanup(io_req);
785 spin_unlock_bh(&tgt->tgt_lock);
786 rc = wait_for_completion_timeout(&io_req->tm_done,
787 BNX2FC_FW_TIMEOUT);
788 spin_lock_bh(&tgt->tgt_lock);
789 io_req->wait_for_comp = 0;
790 if (!rc)
791 kref_put(&io_req->refcount, bnx2fc_cmd_release);
792 }
793
794 spin_unlock_bh(&tgt->tgt_lock);
795
796 if (!rc) {
797 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
798 rc = FAILED;
799 } else {
800 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
801 rc = SUCCESS;
802 }
803 tmf_err:
804 return rc;
805 }
806
807 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
808 {
809 struct fc_lport *lport;
810 struct bnx2fc_rport *tgt = io_req->tgt;
811 struct fc_rport *rport = tgt->rport;
812 struct fc_rport_priv *rdata = tgt->rdata;
813 struct bnx2fc_interface *interface;
814 struct fcoe_port *port;
815 struct bnx2fc_cmd *abts_io_req;
816 struct fcoe_task_ctx_entry *task;
817 struct fcoe_task_ctx_entry *task_page;
818 struct fc_frame_header *fc_hdr;
819 struct bnx2fc_mp_req *abts_req;
820 int task_idx, index;
821 u32 sid, did;
822 u16 xid;
823 int rc = SUCCESS;
824 u32 r_a_tov = rdata->r_a_tov;
825
826 /* called with tgt_lock held */
827 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
828
829 port = io_req->port;
830 interface = port->priv;
831 lport = port->lport;
832
833 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
834 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
835 rc = FAILED;
836 goto abts_err;
837 }
838
839 if (rport == NULL) {
840 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
841 rc = FAILED;
842 goto abts_err;
843 }
844
845 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
846 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
847 rc = FAILED;
848 goto abts_err;
849 }
850
851 abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
852 if (!abts_io_req) {
853 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
854 rc = FAILED;
855 goto abts_err;
856 }
857
858 /* Initialize rest of io_req fields */
859 abts_io_req->sc_cmd = NULL;
860 abts_io_req->port = port;
861 abts_io_req->tgt = tgt;
862 abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
863
864 abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
865 memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
866
867 /* Fill FC header */
868 fc_hdr = &(abts_req->req_fc_hdr);
869
870 /* Obtain oxid and rxid for the original exchange to be aborted */
871 fc_hdr->fh_ox_id = htons(io_req->xid);
872 fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
873
874 sid = tgt->sid;
875 did = rport->port_id;
876
877 __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
878 FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
879 FC_FC_SEQ_INIT, 0);
880
881 xid = abts_io_req->xid;
882 BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
883 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
884 index = xid % BNX2FC_TASKS_PER_PAGE;
885
886 /* Initialize task context for this IO request */
887 task_page = (struct fcoe_task_ctx_entry *)
888 interface->hba->task_ctx[task_idx];
889 task = &(task_page[index]);
890 bnx2fc_init_mp_task(abts_io_req, task);
891
892 /*
893 * ABTS task is a temporary task that will be cleaned up
894 * irrespective of ABTS response. We need to start the timer
895 * for the original exchange, as the CQE is posted for the original
896 * IO request.
897 *
898 * Timer for ABTS is started only when it is originated by a
899 * TM request. For the ABTS issued as part of ULP timeout,
900 * scsi-ml maintains the timers.
901 */
902
903 /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
904 bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
905
906 /* Obtain free SQ entry */
907 bnx2fc_add_2_sq(tgt, xid);
908
909 /* Ring doorbell */
910 bnx2fc_ring_doorbell(tgt);
911
912 abts_err:
913 return rc;
914 }
915
916 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
917 enum fc_rctl r_ctl)
918 {
919 struct fc_lport *lport;
920 struct bnx2fc_rport *tgt = orig_io_req->tgt;
921 struct bnx2fc_interface *interface;
922 struct fcoe_port *port;
923 struct bnx2fc_cmd *seq_clnp_req;
924 struct fcoe_task_ctx_entry *task;
925 struct fcoe_task_ctx_entry *task_page;
926 struct bnx2fc_els_cb_arg *cb_arg = NULL;
927 int task_idx, index;
928 u16 xid;
929 int rc = 0;
930
931 BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
932 orig_io_req->xid);
933 kref_get(&orig_io_req->refcount);
934
935 port = orig_io_req->port;
936 interface = port->priv;
937 lport = port->lport;
938
939 cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
940 if (!cb_arg) {
941 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
942 rc = -ENOMEM;
943 goto cleanup_err;
944 }
945
946 seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
947 if (!seq_clnp_req) {
948 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
949 rc = -ENOMEM;
950 kfree(cb_arg);
951 goto cleanup_err;
952 }
953 /* Initialize rest of io_req fields */
954 seq_clnp_req->sc_cmd = NULL;
955 seq_clnp_req->port = port;
956 seq_clnp_req->tgt = tgt;
957 seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
958
959 xid = seq_clnp_req->xid;
960
961 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
962 index = xid % BNX2FC_TASKS_PER_PAGE;
963
964 /* Initialize task context for this IO request */
965 task_page = (struct fcoe_task_ctx_entry *)
966 interface->hba->task_ctx[task_idx];
967 task = &(task_page[index]);
968 cb_arg->aborted_io_req = orig_io_req;
969 cb_arg->io_req = seq_clnp_req;
970 cb_arg->r_ctl = r_ctl;
971 cb_arg->offset = offset;
972 seq_clnp_req->cb_arg = cb_arg;
973
974 printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
975 bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
976
977 /* Obtain free SQ entry */
978 bnx2fc_add_2_sq(tgt, xid);
979
980 /* Ring doorbell */
981 bnx2fc_ring_doorbell(tgt);
982 cleanup_err:
983 return rc;
984 }
985
986 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
987 {
988 struct fc_lport *lport;
989 struct bnx2fc_rport *tgt = io_req->tgt;
990 struct bnx2fc_interface *interface;
991 struct fcoe_port *port;
992 struct bnx2fc_cmd *cleanup_io_req;
993 struct fcoe_task_ctx_entry *task;
994 struct fcoe_task_ctx_entry *task_page;
995 int task_idx, index;
996 u16 xid, orig_xid;
997 int rc = 0;
998
999 /* ASSUMPTION: called with tgt_lock held */
1000 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1001
1002 port = io_req->port;
1003 interface = port->priv;
1004 lport = port->lport;
1005
1006 cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1007 if (!cleanup_io_req) {
1008 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1009 rc = -1;
1010 goto cleanup_err;
1011 }
1012
1013 /* Initialize rest of io_req fields */
1014 cleanup_io_req->sc_cmd = NULL;
1015 cleanup_io_req->port = port;
1016 cleanup_io_req->tgt = tgt;
1017 cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1018
1019 xid = cleanup_io_req->xid;
1020
1021 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1022 index = xid % BNX2FC_TASKS_PER_PAGE;
1023
1024 /* Initialize task context for this IO request */
1025 task_page = (struct fcoe_task_ctx_entry *)
1026 interface->hba->task_ctx[task_idx];
1027 task = &(task_page[index]);
1028 orig_xid = io_req->xid;
1029
1030 BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1031
1032 bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1033
1034 /* Obtain free SQ entry */
1035 bnx2fc_add_2_sq(tgt, xid);
1036
1037 /* Ring doorbell */
1038 bnx2fc_ring_doorbell(tgt);
1039
1040 cleanup_err:
1041 return rc;
1042 }
1043
1044 /**
1045 * bnx2fc_eh_target_reset: Reset a target
1046 *
1047 * @sc_cmd: SCSI command
1048 *
1049 * Set from SCSI host template to send task mgmt command to the target
1050 * and wait for the response
1051 */
1052 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1053 {
1054 return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1055 }
1056
1057 /**
1058 * bnx2fc_eh_device_reset - Reset a single LUN
1059 *
1060 * @sc_cmd: SCSI command
1061 *
1062 * Set from SCSI host template to send task mgmt command to the target
1063 * and wait for the response
1064 */
1065 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1066 {
1067 return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1068 }
1069
1070 int bnx2fc_abts_cleanup(struct bnx2fc_cmd *io_req)
1071 {
1072 struct bnx2fc_rport *tgt = io_req->tgt;
1073 int rc = SUCCESS;
1074
1075 io_req->wait_for_comp = 1;
1076 bnx2fc_initiate_cleanup(io_req);
1077
1078 spin_unlock_bh(&tgt->tgt_lock);
1079
1080 wait_for_completion(&io_req->tm_done);
1081
1082 io_req->wait_for_comp = 0;
1083 /*
1084 * release the reference taken in eh_abort to allow the
1085 * target to re-login after flushing IOs
1086 */
1087 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1088
1089 spin_lock_bh(&tgt->tgt_lock);
1090 return rc;
1091 }
1092 /**
1093 * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1094 * SCSI command
1095 *
1096 * @sc_cmd: SCSI_ML command pointer
1097 *
1098 * SCSI abort request handler
1099 */
1100 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1101 {
1102 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1103 struct fc_rport_libfc_priv *rp = rport->dd_data;
1104 struct bnx2fc_cmd *io_req;
1105 struct fc_lport *lport;
1106 struct bnx2fc_rport *tgt;
1107 int rc = FAILED;
1108
1109
1110 rc = fc_block_scsi_eh(sc_cmd);
1111 if (rc)
1112 return rc;
1113
1114 lport = shost_priv(sc_cmd->device->host);
1115 if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1116 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1117 return rc;
1118 }
1119
1120 tgt = (struct bnx2fc_rport *)&rp[1];
1121
1122 BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1123
1124 spin_lock_bh(&tgt->tgt_lock);
1125 io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1126 if (!io_req) {
1127 /* Command might have just completed */
1128 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1129 spin_unlock_bh(&tgt->tgt_lock);
1130 return SUCCESS;
1131 }
1132 BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1133 io_req->refcount.refcount.counter);
1134
1135 /* Hold IO request across abort processing */
1136 kref_get(&io_req->refcount);
1137
1138 BUG_ON(tgt != io_req->tgt);
1139
1140 /* Remove the io_req from the active_q. */
1141 /*
1142 * Task Mgmt functions (LUN RESET & TGT RESET) will not
1143 * issue an ABTS on this particular IO req, as the
1144 * io_req is no longer in the active_q.
1145 */
1146 if (tgt->flush_in_prog) {
1147 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1148 "flush in progress\n", io_req->xid);
1149 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1150 spin_unlock_bh(&tgt->tgt_lock);
1151 return SUCCESS;
1152 }
1153
1154 if (io_req->on_active_queue == 0) {
1155 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1156 "not on active_q\n", io_req->xid);
1157 /*
1158 * This condition can happen only due to the FW bug,
1159 * where we do not receive cleanup response from
1160 * the FW. Handle this case gracefully by erroring
1161 * back the IO request to SCSI-ml
1162 */
1163 bnx2fc_scsi_done(io_req, DID_ABORT);
1164
1165 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1166 spin_unlock_bh(&tgt->tgt_lock);
1167 return SUCCESS;
1168 }
1169
1170 /*
1171 * Only eh_abort processing will remove the IO from
1172 * active_cmd_q before processing the request. this is
1173 * done to avoid race conditions between IOs aborted
1174 * as part of task management completion and eh_abort
1175 * processing
1176 */
1177 list_del_init(&io_req->link);
1178 io_req->on_active_queue = 0;
1179 /* Move IO req to retire queue */
1180 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1181
1182 init_completion(&io_req->tm_done);
1183
1184 if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1185 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1186 "already in abts processing\n", io_req->xid);
1187 if (cancel_delayed_work(&io_req->timeout_work))
1188 kref_put(&io_req->refcount,
1189 bnx2fc_cmd_release); /* drop timer hold */
1190 rc = bnx2fc_abts_cleanup(io_req);
1191 /* This only occurs when an task abort was requested while ABTS
1192 is in progress. Setting the IO_CLEANUP flag will skip the
1193 RRQ process in the case when the fw generated SCSI_CMD cmpl
1194 was a result from the ABTS request rather than the CLEANUP
1195 request */
1196 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1197 goto out;
1198 }
1199
1200 /* Cancel the current timer running on this io_req */
1201 if (cancel_delayed_work(&io_req->timeout_work))
1202 kref_put(&io_req->refcount,
1203 bnx2fc_cmd_release); /* drop timer hold */
1204 set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1205 io_req->wait_for_comp = 1;
1206 rc = bnx2fc_initiate_abts(io_req);
1207 if (rc == FAILED) {
1208 bnx2fc_initiate_cleanup(io_req);
1209 spin_unlock_bh(&tgt->tgt_lock);
1210 wait_for_completion(&io_req->tm_done);
1211 spin_lock_bh(&tgt->tgt_lock);
1212 io_req->wait_for_comp = 0;
1213 goto done;
1214 }
1215 spin_unlock_bh(&tgt->tgt_lock);
1216
1217 wait_for_completion(&io_req->tm_done);
1218
1219 spin_lock_bh(&tgt->tgt_lock);
1220 io_req->wait_for_comp = 0;
1221 if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1222 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1223 rc = SUCCESS;
1224 } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1225 &io_req->req_flags))) {
1226 /* Let the scsi-ml try to recover this command */
1227 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1228 io_req->xid);
1229 rc = bnx2fc_abts_cleanup(io_req);
1230 goto out;
1231 } else {
1232 /*
1233 * We come here even when there was a race condition
1234 * between timeout and abts completion, and abts
1235 * completion happens just in time.
1236 */
1237 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1238 rc = SUCCESS;
1239 bnx2fc_scsi_done(io_req, DID_ABORT);
1240 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1241 }
1242 done:
1243 /* release the reference taken in eh_abort */
1244 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1245 out:
1246 spin_unlock_bh(&tgt->tgt_lock);
1247 return rc;
1248 }
1249
1250 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1251 struct fcoe_task_ctx_entry *task,
1252 u8 rx_state)
1253 {
1254 struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1255 struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1256 u32 offset = cb_arg->offset;
1257 enum fc_rctl r_ctl = cb_arg->r_ctl;
1258 int rc = 0;
1259 struct bnx2fc_rport *tgt = orig_io_req->tgt;
1260
1261 BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1262 "cmd_type = %d\n",
1263 seq_clnp_req->xid, seq_clnp_req->cmd_type);
1264
1265 if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1266 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1267 seq_clnp_req->xid);
1268 goto free_cb_arg;
1269 }
1270
1271 spin_unlock_bh(&tgt->tgt_lock);
1272 rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1273 spin_lock_bh(&tgt->tgt_lock);
1274
1275 if (rc)
1276 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1277 " IO will abort\n");
1278 seq_clnp_req->cb_arg = NULL;
1279 kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1280 free_cb_arg:
1281 kfree(cb_arg);
1282 return;
1283 }
1284
1285 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1286 struct fcoe_task_ctx_entry *task,
1287 u8 num_rq)
1288 {
1289 BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1290 "refcnt = %d, cmd_type = %d\n",
1291 io_req->refcount.refcount.counter, io_req->cmd_type);
1292 bnx2fc_scsi_done(io_req, DID_ERROR);
1293 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1294 if (io_req->wait_for_comp)
1295 complete(&io_req->tm_done);
1296 }
1297
1298 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1299 struct fcoe_task_ctx_entry *task,
1300 u8 num_rq)
1301 {
1302 u32 r_ctl;
1303 u32 r_a_tov = FC_DEF_R_A_TOV;
1304 u8 issue_rrq = 0;
1305 struct bnx2fc_rport *tgt = io_req->tgt;
1306
1307 BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1308 "refcnt = %d, cmd_type = %d\n",
1309 io_req->xid,
1310 io_req->refcount.refcount.counter, io_req->cmd_type);
1311
1312 if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1313 &io_req->req_flags)) {
1314 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1315 " this io\n");
1316 return;
1317 }
1318
1319 /* Do not issue RRQ as this IO is already cleanedup */
1320 if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1321 &io_req->req_flags))
1322 goto io_compl;
1323
1324 /*
1325 * For ABTS issued due to SCSI eh_abort_handler, timeout
1326 * values are maintained by scsi-ml itself. Cancel timeout
1327 * in case ABTS issued as part of task management function
1328 * or due to FW error.
1329 */
1330 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1331 if (cancel_delayed_work(&io_req->timeout_work))
1332 kref_put(&io_req->refcount,
1333 bnx2fc_cmd_release); /* drop timer hold */
1334
1335 r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1336
1337 switch (r_ctl) {
1338 case FC_RCTL_BA_ACC:
1339 /*
1340 * Dont release this cmd yet. It will be relesed
1341 * after we get RRQ response
1342 */
1343 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1344 issue_rrq = 1;
1345 break;
1346
1347 case FC_RCTL_BA_RJT:
1348 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1349 break;
1350 default:
1351 printk(KERN_ERR PFX "Unknown ABTS response\n");
1352 break;
1353 }
1354
1355 if (issue_rrq) {
1356 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1357 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1358 }
1359 set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1360 bnx2fc_cmd_timer_set(io_req, r_a_tov);
1361
1362 io_compl:
1363 if (io_req->wait_for_comp) {
1364 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1365 &io_req->req_flags))
1366 complete(&io_req->tm_done);
1367 } else {
1368 /*
1369 * We end up here when ABTS is issued as
1370 * in asynchronous context, i.e., as part
1371 * of task management completion, or
1372 * when FW error is received or when the
1373 * ABTS is issued when the IO is timed
1374 * out.
1375 */
1376
1377 if (io_req->on_active_queue) {
1378 list_del_init(&io_req->link);
1379 io_req->on_active_queue = 0;
1380 /* Move IO req to retire queue */
1381 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1382 }
1383 bnx2fc_scsi_done(io_req, DID_ERROR);
1384 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1385 }
1386 }
1387
1388 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1389 {
1390 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1391 struct bnx2fc_rport *tgt = io_req->tgt;
1392 struct bnx2fc_cmd *cmd, *tmp;
1393 u64 tm_lun = sc_cmd->device->lun;
1394 u64 lun;
1395 int rc = 0;
1396
1397 /* called with tgt_lock held */
1398 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1399 /*
1400 * Walk thru the active_ios queue and ABORT the IO
1401 * that matches with the LUN that was reset
1402 */
1403 list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1404 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1405 lun = cmd->sc_cmd->device->lun;
1406 if (lun == tm_lun) {
1407 /* Initiate ABTS on this cmd */
1408 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1409 &cmd->req_flags)) {
1410 /* cancel the IO timeout */
1411 if (cancel_delayed_work(&io_req->timeout_work))
1412 kref_put(&io_req->refcount,
1413 bnx2fc_cmd_release);
1414 /* timer hold */
1415 rc = bnx2fc_initiate_abts(cmd);
1416 /* abts shouldn't fail in this context */
1417 WARN_ON(rc != SUCCESS);
1418 } else
1419 printk(KERN_ERR PFX "lun_rst: abts already in"
1420 " progress for this IO 0x%x\n",
1421 cmd->xid);
1422 }
1423 }
1424 }
1425
1426 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1427 {
1428 struct bnx2fc_rport *tgt = io_req->tgt;
1429 struct bnx2fc_cmd *cmd, *tmp;
1430 int rc = 0;
1431
1432 /* called with tgt_lock held */
1433 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1434 /*
1435 * Walk thru the active_ios queue and ABORT the IO
1436 * that matches with the LUN that was reset
1437 */
1438 list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1439 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1440 /* Initiate ABTS */
1441 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1442 &cmd->req_flags)) {
1443 /* cancel the IO timeout */
1444 if (cancel_delayed_work(&io_req->timeout_work))
1445 kref_put(&io_req->refcount,
1446 bnx2fc_cmd_release); /* timer hold */
1447 rc = bnx2fc_initiate_abts(cmd);
1448 /* abts shouldn't fail in this context */
1449 WARN_ON(rc != SUCCESS);
1450
1451 } else
1452 printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1453 " for this IO 0x%x\n", cmd->xid);
1454 }
1455 }
1456
1457 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1458 struct fcoe_task_ctx_entry *task, u8 num_rq)
1459 {
1460 struct bnx2fc_mp_req *tm_req;
1461 struct fc_frame_header *fc_hdr;
1462 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1463 u64 *hdr;
1464 u64 *temp_hdr;
1465 void *rsp_buf;
1466
1467 /* Called with tgt_lock held */
1468 BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1469
1470 if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1471 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1472 else {
1473 /* TM has already timed out and we got
1474 * delayed completion. Ignore completion
1475 * processing.
1476 */
1477 return;
1478 }
1479
1480 tm_req = &(io_req->mp_req);
1481 fc_hdr = &(tm_req->resp_fc_hdr);
1482 hdr = (u64 *)fc_hdr;
1483 temp_hdr = (u64 *)
1484 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1485 hdr[0] = cpu_to_be64(temp_hdr[0]);
1486 hdr[1] = cpu_to_be64(temp_hdr[1]);
1487 hdr[2] = cpu_to_be64(temp_hdr[2]);
1488
1489 tm_req->resp_len =
1490 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1491
1492 rsp_buf = tm_req->resp_buf;
1493
1494 if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1495 bnx2fc_parse_fcp_rsp(io_req,
1496 (struct fcoe_fcp_rsp_payload *)
1497 rsp_buf, num_rq);
1498 if (io_req->fcp_rsp_code == 0) {
1499 /* TM successful */
1500 if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1501 bnx2fc_lun_reset_cmpl(io_req);
1502 else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1503 bnx2fc_tgt_reset_cmpl(io_req);
1504 }
1505 } else {
1506 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1507 fc_hdr->fh_r_ctl);
1508 }
1509 if (!sc_cmd->SCp.ptr) {
1510 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1511 return;
1512 }
1513 switch (io_req->fcp_status) {
1514 case FC_GOOD:
1515 if (io_req->cdb_status == 0) {
1516 /* Good IO completion */
1517 sc_cmd->result = DID_OK << 16;
1518 } else {
1519 /* Transport status is good, SCSI status not good */
1520 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1521 }
1522 if (io_req->fcp_resid)
1523 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1524 break;
1525
1526 default:
1527 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1528 io_req->fcp_status);
1529 break;
1530 }
1531
1532 sc_cmd = io_req->sc_cmd;
1533 io_req->sc_cmd = NULL;
1534
1535 /* check if the io_req exists in tgt's tmf_q */
1536 if (io_req->on_tmf_queue) {
1537
1538 list_del_init(&io_req->link);
1539 io_req->on_tmf_queue = 0;
1540 } else {
1541
1542 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1543 return;
1544 }
1545
1546 sc_cmd->SCp.ptr = NULL;
1547 sc_cmd->scsi_done(sc_cmd);
1548
1549 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1550 if (io_req->wait_for_comp) {
1551 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1552 complete(&io_req->tm_done);
1553 }
1554 }
1555
1556 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1557 int bd_index)
1558 {
1559 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1560 int frag_size, sg_frags;
1561
1562 sg_frags = 0;
1563 while (sg_len) {
1564 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1565 frag_size = BNX2FC_BD_SPLIT_SZ;
1566 else
1567 frag_size = sg_len;
1568 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1569 bd[bd_index + sg_frags].buf_addr_hi = addr >> 32;
1570 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1571 bd[bd_index + sg_frags].flags = 0;
1572
1573 addr += (u64) frag_size;
1574 sg_frags++;
1575 sg_len -= frag_size;
1576 }
1577 return sg_frags;
1578
1579 }
1580
1581 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1582 {
1583 struct bnx2fc_interface *interface = io_req->port->priv;
1584 struct bnx2fc_hba *hba = interface->hba;
1585 struct scsi_cmnd *sc = io_req->sc_cmd;
1586 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1587 struct scatterlist *sg;
1588 int byte_count = 0;
1589 int sg_count = 0;
1590 int bd_count = 0;
1591 int sg_frags;
1592 unsigned int sg_len;
1593 u64 addr;
1594 int i;
1595
1596 /*
1597 * Use dma_map_sg directly to ensure we're using the correct
1598 * dev struct off of pcidev.
1599 */
1600 sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1601 scsi_sg_count(sc), sc->sc_data_direction);
1602 scsi_for_each_sg(sc, sg, sg_count, i) {
1603 sg_len = sg_dma_len(sg);
1604 addr = sg_dma_address(sg);
1605 if (sg_len > BNX2FC_MAX_BD_LEN) {
1606 sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1607 bd_count);
1608 } else {
1609
1610 sg_frags = 1;
1611 bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1612 bd[bd_count].buf_addr_hi = addr >> 32;
1613 bd[bd_count].buf_len = (u16)sg_len;
1614 bd[bd_count].flags = 0;
1615 }
1616 bd_count += sg_frags;
1617 byte_count += sg_len;
1618 }
1619 if (byte_count != scsi_bufflen(sc))
1620 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1621 "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1622 io_req->xid);
1623 return bd_count;
1624 }
1625
1626 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1627 {
1628 struct scsi_cmnd *sc = io_req->sc_cmd;
1629 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1630 int bd_count;
1631
1632 if (scsi_sg_count(sc)) {
1633 bd_count = bnx2fc_map_sg(io_req);
1634 if (bd_count == 0)
1635 return -ENOMEM;
1636 } else {
1637 bd_count = 0;
1638 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1639 bd[0].buf_len = bd[0].flags = 0;
1640 }
1641 io_req->bd_tbl->bd_valid = bd_count;
1642
1643 return 0;
1644 }
1645
1646 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1647 {
1648 struct scsi_cmnd *sc = io_req->sc_cmd;
1649 struct bnx2fc_interface *interface = io_req->port->priv;
1650 struct bnx2fc_hba *hba = interface->hba;
1651
1652 /*
1653 * Use dma_unmap_sg directly to ensure we're using the correct
1654 * dev struct off of pcidev.
1655 */
1656 if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1657 dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
1658 scsi_sg_count(sc), sc->sc_data_direction);
1659 io_req->bd_tbl->bd_valid = 0;
1660 }
1661 }
1662
1663 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1664 struct fcp_cmnd *fcp_cmnd)
1665 {
1666 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1667
1668 memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1669
1670 int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1671
1672 fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1673 memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1674
1675 fcp_cmnd->fc_cmdref = 0;
1676 fcp_cmnd->fc_pri_ta = 0;
1677 fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1678 fcp_cmnd->fc_flags = io_req->io_req_flags;
1679 fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1680 }
1681
1682 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1683 struct fcoe_fcp_rsp_payload *fcp_rsp,
1684 u8 num_rq)
1685 {
1686 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1687 struct bnx2fc_rport *tgt = io_req->tgt;
1688 u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1689 u32 rq_buff_len = 0;
1690 int i;
1691 unsigned char *rq_data;
1692 unsigned char *dummy;
1693 int fcp_sns_len = 0;
1694 int fcp_rsp_len = 0;
1695
1696 io_req->fcp_status = FC_GOOD;
1697 io_req->fcp_resid = 0;
1698 if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1699 FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1700 io_req->fcp_resid = fcp_rsp->fcp_resid;
1701
1702 io_req->scsi_comp_flags = rsp_flags;
1703 CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1704 fcp_rsp->scsi_status_code;
1705
1706 /* Fetch fcp_rsp_info and fcp_sns_info if available */
1707 if (num_rq) {
1708
1709 /*
1710 * We do not anticipate num_rq >1, as the linux defined
1711 * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1712 * 256 bytes of single rq buffer is good enough to hold this.
1713 */
1714
1715 if (rsp_flags &
1716 FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1717 fcp_rsp_len = rq_buff_len
1718 = fcp_rsp->fcp_rsp_len;
1719 }
1720
1721 if (rsp_flags &
1722 FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1723 fcp_sns_len = fcp_rsp->fcp_sns_len;
1724 rq_buff_len += fcp_rsp->fcp_sns_len;
1725 }
1726
1727 io_req->fcp_rsp_len = fcp_rsp_len;
1728 io_req->fcp_sns_len = fcp_sns_len;
1729
1730 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1731 /* Invalid sense sense length. */
1732 printk(KERN_ERR PFX "invalid sns length %d\n",
1733 rq_buff_len);
1734 /* reset rq_buff_len */
1735 rq_buff_len = num_rq * BNX2FC_RQ_BUF_SZ;
1736 }
1737
1738 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1739
1740 if (num_rq > 1) {
1741 /* We do not need extra sense data */
1742 for (i = 1; i < num_rq; i++)
1743 dummy = bnx2fc_get_next_rqe(tgt, 1);
1744 }
1745
1746 /* fetch fcp_rsp_code */
1747 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1748 /* Only for task management function */
1749 io_req->fcp_rsp_code = rq_data[3];
1750 printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1751 io_req->fcp_rsp_code);
1752 }
1753
1754 /* fetch sense data */
1755 rq_data += fcp_rsp_len;
1756
1757 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1758 printk(KERN_ERR PFX "Truncating sense buffer\n");
1759 fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1760 }
1761
1762 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1763 if (fcp_sns_len)
1764 memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1765
1766 /* return RQ entries */
1767 for (i = 0; i < num_rq; i++)
1768 bnx2fc_return_rqe(tgt, 1);
1769 }
1770 }
1771
1772 /**
1773 * bnx2fc_queuecommand - Queuecommand function of the scsi template
1774 *
1775 * @host: The Scsi_Host the command was issued to
1776 * @sc_cmd: struct scsi_cmnd to be executed
1777 *
1778 * This is the IO strategy routine, called by SCSI-ML
1779 **/
1780 int bnx2fc_queuecommand(struct Scsi_Host *host,
1781 struct scsi_cmnd *sc_cmd)
1782 {
1783 struct fc_lport *lport = shost_priv(host);
1784 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1785 struct fc_rport_libfc_priv *rp = rport->dd_data;
1786 struct bnx2fc_rport *tgt;
1787 struct bnx2fc_cmd *io_req;
1788 int rc = 0;
1789 int rval;
1790
1791 rval = fc_remote_port_chkready(rport);
1792 if (rval) {
1793 sc_cmd->result = rval;
1794 sc_cmd->scsi_done(sc_cmd);
1795 return 0;
1796 }
1797
1798 if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1799 rc = SCSI_MLQUEUE_HOST_BUSY;
1800 goto exit_qcmd;
1801 }
1802
1803 /* rport and tgt are allocated together, so tgt should be non-NULL */
1804 tgt = (struct bnx2fc_rport *)&rp[1];
1805
1806 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1807 /*
1808 * Session is not offloaded yet. Let SCSI-ml retry
1809 * the command.
1810 */
1811 rc = SCSI_MLQUEUE_TARGET_BUSY;
1812 goto exit_qcmd;
1813 }
1814 if (tgt->retry_delay_timestamp) {
1815 if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1816 tgt->retry_delay_timestamp = 0;
1817 } else {
1818 /* If retry_delay timer is active, flow off the ML */
1819 rc = SCSI_MLQUEUE_TARGET_BUSY;
1820 goto exit_qcmd;
1821 }
1822 }
1823
1824 spin_lock_bh(&tgt->tgt_lock);
1825
1826 io_req = bnx2fc_cmd_alloc(tgt);
1827 if (!io_req) {
1828 rc = SCSI_MLQUEUE_HOST_BUSY;
1829 goto exit_qcmd_tgtlock;
1830 }
1831 io_req->sc_cmd = sc_cmd;
1832
1833 if (bnx2fc_post_io_req(tgt, io_req)) {
1834 printk(KERN_ERR PFX "Unable to post io_req\n");
1835 rc = SCSI_MLQUEUE_HOST_BUSY;
1836 goto exit_qcmd_tgtlock;
1837 }
1838
1839 exit_qcmd_tgtlock:
1840 spin_unlock_bh(&tgt->tgt_lock);
1841 exit_qcmd:
1842 return rc;
1843 }
1844
1845 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1846 struct fcoe_task_ctx_entry *task,
1847 u8 num_rq)
1848 {
1849 struct fcoe_fcp_rsp_payload *fcp_rsp;
1850 struct bnx2fc_rport *tgt = io_req->tgt;
1851 struct scsi_cmnd *sc_cmd;
1852 struct Scsi_Host *host;
1853
1854
1855 /* scsi_cmd_cmpl is called with tgt lock held */
1856
1857 if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1858 /* we will not receive ABTS response for this IO */
1859 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1860 "this scsi cmd\n");
1861 }
1862
1863 /* Cancel the timeout_work, as we received IO completion */
1864 if (cancel_delayed_work(&io_req->timeout_work))
1865 kref_put(&io_req->refcount,
1866 bnx2fc_cmd_release); /* drop timer hold */
1867
1868 sc_cmd = io_req->sc_cmd;
1869 if (sc_cmd == NULL) {
1870 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1871 return;
1872 }
1873
1874 /* Fetch fcp_rsp from task context and perform cmd completion */
1875 fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1876 &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1877
1878 /* parse fcp_rsp and obtain sense data from RQ if available */
1879 bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1880
1881 host = sc_cmd->device->host;
1882 if (!sc_cmd->SCp.ptr) {
1883 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1884 return;
1885 }
1886
1887 if (io_req->on_active_queue) {
1888 list_del_init(&io_req->link);
1889 io_req->on_active_queue = 0;
1890 /* Move IO req to retire queue */
1891 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1892 } else {
1893 /* This should not happen, but could have been pulled
1894 * by bnx2fc_flush_active_ios(), or during a race
1895 * between command abort and (late) completion.
1896 */
1897 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1898 if (io_req->wait_for_comp)
1899 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1900 &io_req->req_flags))
1901 complete(&io_req->tm_done);
1902 }
1903
1904 bnx2fc_unmap_sg_list(io_req);
1905 io_req->sc_cmd = NULL;
1906
1907 switch (io_req->fcp_status) {
1908 case FC_GOOD:
1909 if (io_req->cdb_status == 0) {
1910 /* Good IO completion */
1911 sc_cmd->result = DID_OK << 16;
1912 } else {
1913 /* Transport status is good, SCSI status not good */
1914 BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1915 " fcp_resid = 0x%x\n",
1916 io_req->cdb_status, io_req->fcp_resid);
1917 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1918
1919 if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1920 io_req->cdb_status == SAM_STAT_BUSY) {
1921 /* Set the jiffies + retry_delay_timer * 100ms
1922 for the rport/tgt */
1923 tgt->retry_delay_timestamp = jiffies +
1924 fcp_rsp->retry_delay_timer * HZ / 10;
1925 }
1926
1927 }
1928 if (io_req->fcp_resid)
1929 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1930 break;
1931 default:
1932 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1933 io_req->fcp_status);
1934 break;
1935 }
1936 sc_cmd->SCp.ptr = NULL;
1937 sc_cmd->scsi_done(sc_cmd);
1938 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1939 }
1940
1941 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1942 struct bnx2fc_cmd *io_req)
1943 {
1944 struct fcoe_task_ctx_entry *task;
1945 struct fcoe_task_ctx_entry *task_page;
1946 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1947 struct fcoe_port *port = tgt->port;
1948 struct bnx2fc_interface *interface = port->priv;
1949 struct bnx2fc_hba *hba = interface->hba;
1950 struct fc_lport *lport = port->lport;
1951 struct fc_stats *stats;
1952 int task_idx, index;
1953 u16 xid;
1954
1955 /* bnx2fc_post_io_req() is called with the tgt_lock held */
1956
1957 /* Initialize rest of io_req fields */
1958 io_req->cmd_type = BNX2FC_SCSI_CMD;
1959 io_req->port = port;
1960 io_req->tgt = tgt;
1961 io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1962 sc_cmd->SCp.ptr = (char *)io_req;
1963
1964 stats = per_cpu_ptr(lport->stats, get_cpu());
1965 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1966 io_req->io_req_flags = BNX2FC_READ;
1967 stats->InputRequests++;
1968 stats->InputBytes += io_req->data_xfer_len;
1969 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1970 io_req->io_req_flags = BNX2FC_WRITE;
1971 stats->OutputRequests++;
1972 stats->OutputBytes += io_req->data_xfer_len;
1973 } else {
1974 io_req->io_req_flags = 0;
1975 stats->ControlRequests++;
1976 }
1977 put_cpu();
1978
1979 xid = io_req->xid;
1980
1981 /* Build buffer descriptor list for firmware from sg list */
1982 if (bnx2fc_build_bd_list_from_sg(io_req)) {
1983 printk(KERN_ERR PFX "BD list creation failed\n");
1984 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1985 return -EAGAIN;
1986 }
1987
1988 task_idx = xid / BNX2FC_TASKS_PER_PAGE;
1989 index = xid % BNX2FC_TASKS_PER_PAGE;
1990
1991 /* Initialize task context for this IO request */
1992 task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
1993 task = &(task_page[index]);
1994 bnx2fc_init_task(io_req, task);
1995
1996 if (tgt->flush_in_prog) {
1997 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
1998 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1999 return -EAGAIN;
2000 }
2001
2002 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2003 printk(KERN_ERR PFX "Session not ready...post_io\n");
2004 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2005 return -EAGAIN;
2006 }
2007
2008 /* Time IO req */
2009 if (tgt->io_timeout)
2010 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2011 /* Obtain free SQ entry */
2012 bnx2fc_add_2_sq(tgt, xid);
2013
2014 /* Enqueue the io_req to active_cmd_queue */
2015
2016 io_req->on_active_queue = 1;
2017 /* move io_req from pending_queue to active_queue */
2018 list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2019
2020 /* Ring doorbell */
2021 bnx2fc_ring_doorbell(tgt);
2022 return 0;
2023 }
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