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drm/modes: Fix drm_mode_vrefres() docs
[drm/drm-misc.git] / drivers / scsi / bnx2fc / bnx2fc_io.c
blob33057908f1477922d13144e4b6230609a6de79ca
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) 2014-2016 QLogic Corporation
6 * Copyright (c) 2016-2017 Cavium Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation.
11 *
12 * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
13 */
14
15 #include "bnx2fc.h"
16
17 #define RESERVE_FREE_LIST_INDEX num_possible_cpus()
18
19 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
20 int bd_index);
21 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
22 static int bnx2fc_build_bd_list_from_sg(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, unsigned char *rq_data);
28
29 void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
30 unsigned int timer_msec)
31 {
32 struct bnx2fc_interface *interface = io_req->port->priv;
33
34 if (queue_delayed_work(interface->timer_work_queue,
35 &io_req->timeout_work,
36 msecs_to_jiffies(timer_msec)))
37 kref_get(&io_req->refcount);
38 }
39
40 static void bnx2fc_cmd_timeout(struct work_struct *work)
41 {
42 struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
43 timeout_work.work);
44 u8 cmd_type = io_req->cmd_type;
45 struct bnx2fc_rport *tgt = io_req->tgt;
46 int rc;
47
48 BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
49 "req_flags = %lx\n", cmd_type, io_req->req_flags);
50
51 spin_lock_bh(&tgt->tgt_lock);
52 if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
53 clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
54 /*
55 * ideally we should hold the io_req until RRQ complets,
56 * and release io_req from timeout hold.
57 */
58 spin_unlock_bh(&tgt->tgt_lock);
59 bnx2fc_send_rrq(io_req);
60 return;
61 }
62 if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
63 BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
64 goto done;
65 }
66
67 switch (cmd_type) {
68 case BNX2FC_SCSI_CMD:
69 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
70 &io_req->req_flags)) {
71 /* Handle eh_abort timeout */
72 BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
73 complete(&io_req->abts_done);
74 } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
75 &io_req->req_flags)) {
76 /* Handle internally generated ABTS timeout */
77 BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
78 kref_read(&io_req->refcount));
79 if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
80 &io_req->req_flags))) {
81 /*
82 * Cleanup and return original command to
83 * mid-layer.
84 */
85 bnx2fc_initiate_cleanup(io_req);
86 kref_put(&io_req->refcount, bnx2fc_cmd_release);
87 spin_unlock_bh(&tgt->tgt_lock);
88
89 return;
90 }
91 } else {
92 /* Hanlde IO timeout */
93 BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
94 if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
95 &io_req->req_flags)) {
96 BNX2FC_IO_DBG(io_req, "IO completed before "
97 " timer expiry\n");
98 goto done;
99 }
100
101 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
102 &io_req->req_flags)) {
103 rc = bnx2fc_initiate_abts(io_req);
104 if (rc == SUCCESS)
105 goto done;
106
107 kref_put(&io_req->refcount, bnx2fc_cmd_release);
108 spin_unlock_bh(&tgt->tgt_lock);
109
110 return;
111 } else {
112 BNX2FC_IO_DBG(io_req, "IO already in "
113 "ABTS processing\n");
114 }
115 }
116 break;
117 case BNX2FC_ELS:
118
119 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
120 BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
121
122 if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
123 &io_req->req_flags)) {
124 kref_put(&io_req->refcount, bnx2fc_cmd_release);
125 spin_unlock_bh(&tgt->tgt_lock);
126
127 return;
128 }
129 } else {
130 /*
131 * Handle ELS timeout.
132 * tgt_lock is used to sync compl path and timeout
133 * path. If els compl path is processing this IO, we
134 * have nothing to do here, just release the timer hold
135 */
136 BNX2FC_IO_DBG(io_req, "ELS timed out\n");
137 if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
138 &io_req->req_flags))
139 goto done;
140
141 /* Indicate the cb_func that this ELS is timed out */
142 set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
143
144 if ((io_req->cb_func) && (io_req->cb_arg)) {
145 io_req->cb_func(io_req->cb_arg);
146 io_req->cb_arg = NULL;
147 }
148 }
149 break;
150 default:
151 printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
152 cmd_type);
153 break;
154 }
155
156 done:
157 /* release the cmd that was held when timer was set */
158 kref_put(&io_req->refcount, bnx2fc_cmd_release);
159 spin_unlock_bh(&tgt->tgt_lock);
160 }
161
162 static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
163 {
164 /* Called with host lock held */
165 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
166
167 /*
168 * active_cmd_queue may have other command types as well,
169 * and during flush operation, we want to error back only
170 * scsi commands.
171 */
172 if (io_req->cmd_type != BNX2FC_SCSI_CMD)
173 return;
174
175 BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
176 if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
177 /* Do not call scsi done for this IO */
178 return;
179 }
180
181 bnx2fc_unmap_sg_list(io_req);
182 io_req->sc_cmd = NULL;
183
184 /* Sanity checks before returning command to mid-layer */
185 if (!sc_cmd) {
186 printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
187 "IO(0x%x) already cleaned up\n",
188 io_req->xid);
189 return;
190 }
191 if (!sc_cmd->device) {
192 pr_err(PFX "0x%x: sc_cmd->device is NULL.\n", io_req->xid);
193 return;
194 }
195 if (!sc_cmd->device->host) {
196 pr_err(PFX "0x%x: sc_cmd->device->host is NULL.\n",
197 io_req->xid);
198 return;
199 }
200
201 sc_cmd->result = err_code << 16;
202
203 BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
204 sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
205 sc_cmd->allowed);
206 scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
207 bnx2fc_priv(sc_cmd)->io_req = NULL;
208 scsi_done(sc_cmd);
209 }
210
211 struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
212 {
213 struct bnx2fc_cmd_mgr *cmgr;
214 struct io_bdt *bdt_info;
215 struct bnx2fc_cmd *io_req;
216 size_t len;
217 u32 mem_size;
218 u16 xid;
219 int i;
220 int num_ios, num_pri_ios;
221 size_t bd_tbl_sz;
222 int arr_sz = num_possible_cpus() + 1;
223 u16 min_xid = BNX2FC_MIN_XID;
224 u16 max_xid = hba->max_xid;
225
226 if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
227 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
228 and max_xid 0x%x\n", min_xid, max_xid);
229 return NULL;
230 }
231 BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
232
233 num_ios = max_xid - min_xid + 1;
234 len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
235 len += sizeof(struct bnx2fc_cmd_mgr);
236
237 cmgr = kzalloc(len, GFP_KERNEL);
238 if (!cmgr) {
239 printk(KERN_ERR PFX "failed to alloc cmgr\n");
240 return NULL;
241 }
242
243 cmgr->hba = hba;
244 cmgr->free_list = kcalloc(arr_sz, sizeof(*cmgr->free_list),
245 GFP_KERNEL);
246 if (!cmgr->free_list) {
247 printk(KERN_ERR PFX "failed to alloc free_list\n");
248 goto mem_err;
249 }
250
251 cmgr->free_list_lock = kcalloc(arr_sz, sizeof(*cmgr->free_list_lock),
252 GFP_KERNEL);
253 if (!cmgr->free_list_lock) {
254 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
255 kfree(cmgr->free_list);
256 cmgr->free_list = NULL;
257 goto mem_err;
258 }
259
260 cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
261
262 for (i = 0; i < arr_sz; i++) {
263 INIT_LIST_HEAD(&cmgr->free_list[i]);
264 spin_lock_init(&cmgr->free_list_lock[i]);
265 }
266
267 /*
268 * Pre-allocated pool of bnx2fc_cmds.
269 * Last entry in the free list array is the free list
270 * of slow path requests.
271 */
272 xid = BNX2FC_MIN_XID;
273 num_pri_ios = num_ios - hba->elstm_xids;
274 for (i = 0; i < num_ios; i++) {
275 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
276
277 if (!io_req) {
278 printk(KERN_ERR PFX "failed to alloc io_req\n");
279 goto mem_err;
280 }
281
282 INIT_LIST_HEAD(&io_req->link);
283 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
284
285 io_req->xid = xid++;
286 if (i < num_pri_ios)
287 list_add_tail(&io_req->link,
288 &cmgr->free_list[io_req->xid %
289 num_possible_cpus()]);
290 else
291 list_add_tail(&io_req->link,
292 &cmgr->free_list[num_possible_cpus()]);
293 io_req++;
294 }
295
296 /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
297 mem_size = num_ios * sizeof(struct io_bdt *);
298 cmgr->io_bdt_pool = kzalloc(mem_size, GFP_KERNEL);
299 if (!cmgr->io_bdt_pool) {
300 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
301 goto mem_err;
302 }
303
304 mem_size = sizeof(struct io_bdt);
305 for (i = 0; i < num_ios; i++) {
306 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
307 if (!cmgr->io_bdt_pool[i]) {
308 printk(KERN_ERR PFX "failed to alloc "
309 "io_bdt_pool[%d]\n", i);
310 goto mem_err;
311 }
312 }
313
314 /* Allocate an map fcoe_bdt_ctx structures */
315 bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
316 for (i = 0; i < num_ios; i++) {
317 bdt_info = cmgr->io_bdt_pool[i];
318 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
319 bd_tbl_sz,
320 &bdt_info->bd_tbl_dma,
321 GFP_KERNEL);
322 if (!bdt_info->bd_tbl) {
323 printk(KERN_ERR PFX "failed to alloc "
324 "bdt_tbl[%d]\n", i);
325 goto mem_err;
326 }
327 }
328
329 return cmgr;
330
331 mem_err:
332 bnx2fc_cmd_mgr_free(cmgr);
333 return NULL;
334 }
335
336 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
337 {
338 struct io_bdt *bdt_info;
339 struct bnx2fc_hba *hba = cmgr->hba;
340 size_t bd_tbl_sz;
341 u16 min_xid = BNX2FC_MIN_XID;
342 u16 max_xid = hba->max_xid;
343 int num_ios;
344 int i;
345
346 num_ios = max_xid - min_xid + 1;
347
348 /* Free fcoe_bdt_ctx structures */
349 if (!cmgr->io_bdt_pool)
350 goto free_cmd_pool;
351
352 bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
353 for (i = 0; i < num_ios; i++) {
354 bdt_info = cmgr->io_bdt_pool[i];
355 if (bdt_info->bd_tbl) {
356 dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
357 bdt_info->bd_tbl,
358 bdt_info->bd_tbl_dma);
359 bdt_info->bd_tbl = NULL;
360 }
361 }
362
363 /* Destroy io_bdt pool */
364 for (i = 0; i < num_ios; i++) {
365 kfree(cmgr->io_bdt_pool[i]);
366 cmgr->io_bdt_pool[i] = NULL;
367 }
368
369 kfree(cmgr->io_bdt_pool);
370 cmgr->io_bdt_pool = NULL;
371
372 free_cmd_pool:
373 kfree(cmgr->free_list_lock);
374
375 /* Destroy cmd pool */
376 if (!cmgr->free_list)
377 goto free_cmgr;
378
379 for (i = 0; i < num_possible_cpus() + 1; i++) {
380 struct bnx2fc_cmd *tmp, *io_req;
381
382 list_for_each_entry_safe(io_req, tmp,
383 &cmgr->free_list[i], link) {
384 list_del(&io_req->link);
385 kfree(io_req);
386 }
387 }
388 kfree(cmgr->free_list);
389 free_cmgr:
390 /* Free command manager itself */
391 kfree(cmgr);
392 }
393
394 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
395 {
396 struct fcoe_port *port = tgt->port;
397 struct bnx2fc_interface *interface = port->priv;
398 struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
399 struct bnx2fc_cmd *io_req;
400 struct list_head *listp;
401 struct io_bdt *bd_tbl;
402 int index = RESERVE_FREE_LIST_INDEX;
403 u32 free_sqes;
404 u32 max_sqes;
405 u16 xid;
406
407 max_sqes = tgt->max_sqes;
408 switch (type) {
409 case BNX2FC_TASK_MGMT_CMD:
410 max_sqes = BNX2FC_TM_MAX_SQES;
411 break;
412 case BNX2FC_ELS:
413 max_sqes = BNX2FC_ELS_MAX_SQES;
414 break;
415 default:
416 break;
417 }
418
419 /*
420 * NOTE: Free list insertions and deletions are protected with
421 * cmgr lock
422 */
423 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
424 free_sqes = atomic_read(&tgt->free_sqes);
425 if ((list_empty(&(cmd_mgr->free_list[index]))) ||
426 (tgt->num_active_ios.counter >= max_sqes) ||
427 (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
428 BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
429 "ios(%d):sqes(%d)\n",
430 tgt->num_active_ios.counter, tgt->max_sqes);
431 if (list_empty(&(cmd_mgr->free_list[index])))
432 printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
433 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
434 return NULL;
435 }
436
437 listp = (struct list_head *)
438 cmd_mgr->free_list[index].next;
439 list_del_init(listp);
440 io_req = (struct bnx2fc_cmd *) listp;
441 xid = io_req->xid;
442 cmd_mgr->cmds[xid] = io_req;
443 atomic_inc(&tgt->num_active_ios);
444 atomic_dec(&tgt->free_sqes);
445 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
446
447 INIT_LIST_HEAD(&io_req->link);
448
449 io_req->port = port;
450 io_req->cmd_mgr = cmd_mgr;
451 io_req->req_flags = 0;
452 io_req->cmd_type = type;
453
454 /* Bind io_bdt for this io_req */
455 /* Have a static link between io_req and io_bdt_pool */
456 bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
457 bd_tbl->io_req = io_req;
458
459 /* Hold the io_req against deletion */
460 kref_init(&io_req->refcount);
461 return io_req;
462 }
463
464 struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
465 {
466 struct fcoe_port *port = tgt->port;
467 struct bnx2fc_interface *interface = port->priv;
468 struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
469 struct bnx2fc_cmd *io_req;
470 struct list_head *listp;
471 struct io_bdt *bd_tbl;
472 u32 free_sqes;
473 u32 max_sqes;
474 u16 xid;
475 int index = raw_smp_processor_id();
476
477 max_sqes = BNX2FC_SCSI_MAX_SQES;
478 /*
479 * NOTE: Free list insertions and deletions are protected with
480 * cmgr lock
481 */
482 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
483 free_sqes = atomic_read(&tgt->free_sqes);
484 if ((list_empty(&cmd_mgr->free_list[index])) ||
485 (tgt->num_active_ios.counter >= max_sqes) ||
486 (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
487 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
488 return NULL;
489 }
490
491 listp = (struct list_head *)
492 cmd_mgr->free_list[index].next;
493 list_del_init(listp);
494 io_req = (struct bnx2fc_cmd *) listp;
495 xid = io_req->xid;
496 cmd_mgr->cmds[xid] = io_req;
497 atomic_inc(&tgt->num_active_ios);
498 atomic_dec(&tgt->free_sqes);
499 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
500
501 INIT_LIST_HEAD(&io_req->link);
502
503 io_req->port = port;
504 io_req->cmd_mgr = cmd_mgr;
505 io_req->req_flags = 0;
506
507 /* Bind io_bdt for this io_req */
508 /* Have a static link between io_req and io_bdt_pool */
509 bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
510 bd_tbl->io_req = io_req;
511
512 /* Hold the io_req against deletion */
513 kref_init(&io_req->refcount);
514 return io_req;
515 }
516
517 void bnx2fc_cmd_release(struct kref *ref)
518 {
519 struct bnx2fc_cmd *io_req = container_of(ref,
520 struct bnx2fc_cmd, refcount);
521 struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
522 int index;
523
524 if (io_req->cmd_type == BNX2FC_SCSI_CMD)
525 index = io_req->xid % num_possible_cpus();
526 else
527 index = RESERVE_FREE_LIST_INDEX;
528
529
530 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
531 if (io_req->cmd_type != BNX2FC_SCSI_CMD)
532 bnx2fc_free_mp_resc(io_req);
533 cmd_mgr->cmds[io_req->xid] = NULL;
534 /* Delete IO from retire queue */
535 list_del_init(&io_req->link);
536 /* Add it to the free list */
537 list_add(&io_req->link,
538 &cmd_mgr->free_list[index]);
539 atomic_dec(&io_req->tgt->num_active_ios);
540 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
541
542 }
543
544 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
545 {
546 struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
547 struct bnx2fc_interface *interface = io_req->port->priv;
548 struct bnx2fc_hba *hba = interface->hba;
549 size_t sz = sizeof(struct fcoe_bd_ctx);
550
551 /* clear tm flags */
552 mp_req->tm_flags = 0;
553 if (mp_req->mp_req_bd) {
554 dma_free_coherent(&hba->pcidev->dev, sz,
555 mp_req->mp_req_bd,
556 mp_req->mp_req_bd_dma);
557 mp_req->mp_req_bd = NULL;
558 }
559 if (mp_req->mp_resp_bd) {
560 dma_free_coherent(&hba->pcidev->dev, sz,
561 mp_req->mp_resp_bd,
562 mp_req->mp_resp_bd_dma);
563 mp_req->mp_resp_bd = NULL;
564 }
565 if (mp_req->req_buf) {
566 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
567 mp_req->req_buf,
568 mp_req->req_buf_dma);
569 mp_req->req_buf = NULL;
570 }
571 if (mp_req->resp_buf) {
572 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
573 mp_req->resp_buf,
574 mp_req->resp_buf_dma);
575 mp_req->resp_buf = NULL;
576 }
577 }
578
579 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
580 {
581 struct bnx2fc_mp_req *mp_req;
582 struct fcoe_bd_ctx *mp_req_bd;
583 struct fcoe_bd_ctx *mp_resp_bd;
584 struct bnx2fc_interface *interface = io_req->port->priv;
585 struct bnx2fc_hba *hba = interface->hba;
586 dma_addr_t addr;
587 size_t sz;
588
589 mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
590 memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
591
592 if (io_req->cmd_type != BNX2FC_ELS) {
593 mp_req->req_len = sizeof(struct fcp_cmnd);
594 io_req->data_xfer_len = mp_req->req_len;
595 } else
596 mp_req->req_len = io_req->data_xfer_len;
597
598 mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
599 &mp_req->req_buf_dma,
600 GFP_ATOMIC);
601 if (!mp_req->req_buf) {
602 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
603 bnx2fc_free_mp_resc(io_req);
604 return FAILED;
605 }
606
607 mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
608 &mp_req->resp_buf_dma,
609 GFP_ATOMIC);
610 if (!mp_req->resp_buf) {
611 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
612 bnx2fc_free_mp_resc(io_req);
613 return FAILED;
614 }
615 memset(mp_req->req_buf, 0, CNIC_PAGE_SIZE);
616 memset(mp_req->resp_buf, 0, CNIC_PAGE_SIZE);
617
618 /* Allocate and map mp_req_bd and mp_resp_bd */
619 sz = sizeof(struct fcoe_bd_ctx);
620 mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
621 &mp_req->mp_req_bd_dma,
622 GFP_ATOMIC);
623 if (!mp_req->mp_req_bd) {
624 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
625 bnx2fc_free_mp_resc(io_req);
626 return FAILED;
627 }
628 mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
629 &mp_req->mp_resp_bd_dma,
630 GFP_ATOMIC);
631 if (!mp_req->mp_resp_bd) {
632 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
633 bnx2fc_free_mp_resc(io_req);
634 return FAILED;
635 }
636 /* Fill bd table */
637 addr = mp_req->req_buf_dma;
638 mp_req_bd = mp_req->mp_req_bd;
639 mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
640 mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
641 mp_req_bd->buf_len = CNIC_PAGE_SIZE;
642 mp_req_bd->flags = 0;
643
644 /*
645 * MP buffer is either a task mgmt command or an ELS.
646 * So the assumption is that it consumes a single bd
647 * entry in the bd table
648 */
649 mp_resp_bd = mp_req->mp_resp_bd;
650 addr = mp_req->resp_buf_dma;
651 mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
652 mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
653 mp_resp_bd->buf_len = CNIC_PAGE_SIZE;
654 mp_resp_bd->flags = 0;
655
656 return SUCCESS;
657 }
658
659 static int bnx2fc_initiate_tmf(struct fc_lport *lport, struct fc_rport *rport,
660 u64 tm_lun, u8 tm_flags)
661 {
662 struct fc_rport_libfc_priv *rp;
663 struct fcoe_port *port;
664 struct bnx2fc_interface *interface;
665 struct bnx2fc_rport *tgt;
666 struct bnx2fc_cmd *io_req;
667 struct bnx2fc_mp_req *tm_req;
668 struct fcoe_task_ctx_entry *task;
669 struct fcoe_task_ctx_entry *task_page;
670 struct fc_frame_header *fc_hdr;
671 struct fcp_cmnd *fcp_cmnd;
672 int task_idx, index;
673 int rc = SUCCESS;
674 u16 xid;
675 u32 sid, did;
676 unsigned long start = jiffies;
677
678 port = lport_priv(lport);
679 interface = port->priv;
680
681 if (rport == NULL) {
682 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
683 rc = FAILED;
684 goto tmf_err;
685 }
686 rp = rport->dd_data;
687
688 rc = fc_block_rport(rport);
689 if (rc)
690 return rc;
691
692 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
693 printk(KERN_ERR PFX "device_reset: link is not ready\n");
694 rc = FAILED;
695 goto tmf_err;
696 }
697 /* rport and tgt are allocated together, so tgt should be non-NULL */
698 tgt = (struct bnx2fc_rport *)&rp[1];
699
700 if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
701 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
702 rc = FAILED;
703 goto tmf_err;
704 }
705 retry_tmf:
706 io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
707 if (!io_req) {
708 if (time_after(jiffies, start + HZ)) {
709 printk(KERN_ERR PFX "tmf: Failed TMF");
710 rc = FAILED;
711 goto tmf_err;
712 }
713 msleep(20);
714 goto retry_tmf;
715 }
716 /* Initialize rest of io_req fields */
717 io_req->sc_cmd = NULL;
718 io_req->port = port;
719 io_req->tgt = tgt;
720
721 tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
722
723 rc = bnx2fc_init_mp_req(io_req);
724 if (rc == FAILED) {
725 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
726 spin_lock_bh(&tgt->tgt_lock);
727 kref_put(&io_req->refcount, bnx2fc_cmd_release);
728 spin_unlock_bh(&tgt->tgt_lock);
729 goto tmf_err;
730 }
731
732 /* Set TM flags */
733 io_req->io_req_flags = 0;
734 tm_req->tm_flags = tm_flags;
735 tm_req->tm_lun = tm_lun;
736
737 /* Fill FCP_CMND */
738 bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
739 fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
740 int_to_scsilun(tm_lun, &fcp_cmnd->fc_lun);
741 memset(fcp_cmnd->fc_cdb, 0, BNX2FC_MAX_CMD_LEN);
742 fcp_cmnd->fc_dl = 0;
743
744 /* Fill FC header */
745 fc_hdr = &(tm_req->req_fc_hdr);
746 sid = tgt->sid;
747 did = rport->port_id;
748 __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
749 FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
750 FC_FC_SEQ_INIT, 0);
751 /* Obtain exchange id */
752 xid = io_req->xid;
753
754 BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
755 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
756 index = xid % BNX2FC_TASKS_PER_PAGE;
757
758 /* Initialize task context for this IO request */
759 task_page = (struct fcoe_task_ctx_entry *)
760 interface->hba->task_ctx[task_idx];
761 task = &(task_page[index]);
762 bnx2fc_init_mp_task(io_req, task);
763
764 /* Obtain free SQ entry */
765 spin_lock_bh(&tgt->tgt_lock);
766 bnx2fc_add_2_sq(tgt, xid);
767
768 /* Enqueue the io_req to active_tm_queue */
769 io_req->on_tmf_queue = 1;
770 list_add_tail(&io_req->link, &tgt->active_tm_queue);
771
772 init_completion(&io_req->abts_done);
773 io_req->wait_for_abts_comp = 1;
774
775 /* Ring doorbell */
776 bnx2fc_ring_doorbell(tgt);
777 spin_unlock_bh(&tgt->tgt_lock);
778
779 rc = wait_for_completion_timeout(&io_req->abts_done,
780 interface->tm_timeout * HZ);
781 spin_lock_bh(&tgt->tgt_lock);
782
783 io_req->wait_for_abts_comp = 0;
784 if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
785 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
786 if (io_req->on_tmf_queue) {
787 list_del_init(&io_req->link);
788 io_req->on_tmf_queue = 0;
789 }
790 io_req->wait_for_cleanup_comp = 1;
791 init_completion(&io_req->cleanup_done);
792 bnx2fc_initiate_cleanup(io_req);
793 spin_unlock_bh(&tgt->tgt_lock);
794 rc = wait_for_completion_timeout(&io_req->cleanup_done,
795 BNX2FC_FW_TIMEOUT);
796 spin_lock_bh(&tgt->tgt_lock);
797 io_req->wait_for_cleanup_comp = 0;
798 if (!rc)
799 kref_put(&io_req->refcount, bnx2fc_cmd_release);
800 }
801
802 spin_unlock_bh(&tgt->tgt_lock);
803
804 if (!rc) {
805 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
806 rc = FAILED;
807 } else {
808 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
809 rc = SUCCESS;
810 }
811 tmf_err:
812 return rc;
813 }
814
815 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
816 {
817 struct fc_lport *lport;
818 struct bnx2fc_rport *tgt = io_req->tgt;
819 struct fc_rport *rport = tgt->rport;
820 struct fc_rport_priv *rdata = tgt->rdata;
821 struct bnx2fc_interface *interface;
822 struct fcoe_port *port;
823 struct bnx2fc_cmd *abts_io_req;
824 struct fcoe_task_ctx_entry *task;
825 struct fcoe_task_ctx_entry *task_page;
826 struct fc_frame_header *fc_hdr;
827 struct bnx2fc_mp_req *abts_req;
828 int task_idx, index;
829 u32 sid, did;
830 u16 xid;
831 int rc = SUCCESS;
832 u32 r_a_tov = rdata->r_a_tov;
833
834 /* called with tgt_lock held */
835 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
836
837 port = io_req->port;
838 interface = port->priv;
839 lport = port->lport;
840
841 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
842 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
843 rc = FAILED;
844 goto abts_err;
845 }
846
847 if (rport == NULL) {
848 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
849 rc = FAILED;
850 goto abts_err;
851 }
852
853 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
854 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
855 rc = FAILED;
856 goto abts_err;
857 }
858
859 abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
860 if (!abts_io_req) {
861 printk(KERN_ERR PFX "abts: couldn't allocate cmd\n");
862 rc = FAILED;
863 goto abts_err;
864 }
865
866 /* Initialize rest of io_req fields */
867 abts_io_req->sc_cmd = NULL;
868 abts_io_req->port = port;
869 abts_io_req->tgt = tgt;
870 abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
871
872 abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
873 memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
874
875 /* Fill FC header */
876 fc_hdr = &(abts_req->req_fc_hdr);
877
878 /* Obtain oxid and rxid for the original exchange to be aborted */
879 fc_hdr->fh_ox_id = htons(io_req->xid);
880 fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
881
882 sid = tgt->sid;
883 did = rport->port_id;
884
885 __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
886 FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
887 FC_FC_SEQ_INIT, 0);
888
889 xid = abts_io_req->xid;
890 BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
891 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
892 index = xid % BNX2FC_TASKS_PER_PAGE;
893
894 /* Initialize task context for this IO request */
895 task_page = (struct fcoe_task_ctx_entry *)
896 interface->hba->task_ctx[task_idx];
897 task = &(task_page[index]);
898 bnx2fc_init_mp_task(abts_io_req, task);
899
900 /*
901 * ABTS task is a temporary task that will be cleaned up
902 * irrespective of ABTS response. We need to start the timer
903 * for the original exchange, as the CQE is posted for the original
904 * IO request.
905 *
906 * Timer for ABTS is started only when it is originated by a
907 * TM request. For the ABTS issued as part of ULP timeout,
908 * scsi-ml maintains the timers.
909 */
910
911 /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
912 bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
913
914 /* Obtain free SQ entry */
915 bnx2fc_add_2_sq(tgt, xid);
916
917 /* Ring doorbell */
918 bnx2fc_ring_doorbell(tgt);
919
920 abts_err:
921 return rc;
922 }
923
924 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
925 enum fc_rctl r_ctl)
926 {
927 struct bnx2fc_rport *tgt = orig_io_req->tgt;
928 struct bnx2fc_interface *interface;
929 struct fcoe_port *port;
930 struct bnx2fc_cmd *seq_clnp_req;
931 struct fcoe_task_ctx_entry *task;
932 struct fcoe_task_ctx_entry *task_page;
933 struct bnx2fc_els_cb_arg *cb_arg = NULL;
934 int task_idx, index;
935 u16 xid;
936 int rc = 0;
937
938 BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
939 orig_io_req->xid);
940 kref_get(&orig_io_req->refcount);
941
942 port = orig_io_req->port;
943 interface = port->priv;
944
945 cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
946 if (!cb_arg) {
947 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
948 rc = -ENOMEM;
949 goto cleanup_err;
950 }
951
952 seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
953 if (!seq_clnp_req) {
954 printk(KERN_ERR PFX "cleanup: couldn't allocate cmd\n");
955 rc = -ENOMEM;
956 kfree(cb_arg);
957 goto cleanup_err;
958 }
959 /* Initialize rest of io_req fields */
960 seq_clnp_req->sc_cmd = NULL;
961 seq_clnp_req->port = port;
962 seq_clnp_req->tgt = tgt;
963 seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
964
965 xid = seq_clnp_req->xid;
966
967 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
968 index = xid % BNX2FC_TASKS_PER_PAGE;
969
970 /* Initialize task context for this IO request */
971 task_page = (struct fcoe_task_ctx_entry *)
972 interface->hba->task_ctx[task_idx];
973 task = &(task_page[index]);
974 cb_arg->aborted_io_req = orig_io_req;
975 cb_arg->io_req = seq_clnp_req;
976 cb_arg->r_ctl = r_ctl;
977 cb_arg->offset = offset;
978 seq_clnp_req->cb_arg = cb_arg;
979
980 printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
981 bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
982
983 /* Obtain free SQ entry */
984 bnx2fc_add_2_sq(tgt, xid);
985
986 /* Ring doorbell */
987 bnx2fc_ring_doorbell(tgt);
988 cleanup_err:
989 return rc;
990 }
991
992 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
993 {
994 struct bnx2fc_rport *tgt = io_req->tgt;
995 struct bnx2fc_interface *interface;
996 struct fcoe_port *port;
997 struct bnx2fc_cmd *cleanup_io_req;
998 struct fcoe_task_ctx_entry *task;
999 struct fcoe_task_ctx_entry *task_page;
1000 int task_idx, index;
1001 u16 xid, orig_xid;
1002 int rc = 0;
1003
1004 /* ASSUMPTION: called with tgt_lock held */
1005 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1006
1007 port = io_req->port;
1008 interface = port->priv;
1009
1010 cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1011 if (!cleanup_io_req) {
1012 printk(KERN_ERR PFX "cleanup: couldn't allocate cmd\n");
1013 rc = -1;
1014 goto cleanup_err;
1015 }
1016
1017 /* Initialize rest of io_req fields */
1018 cleanup_io_req->sc_cmd = NULL;
1019 cleanup_io_req->port = port;
1020 cleanup_io_req->tgt = tgt;
1021 cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1022
1023 xid = cleanup_io_req->xid;
1024
1025 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1026 index = xid % BNX2FC_TASKS_PER_PAGE;
1027
1028 /* Initialize task context for this IO request */
1029 task_page = (struct fcoe_task_ctx_entry *)
1030 interface->hba->task_ctx[task_idx];
1031 task = &(task_page[index]);
1032 orig_xid = io_req->xid;
1033
1034 BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1035
1036 bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1037
1038 /* Obtain free SQ entry */
1039 bnx2fc_add_2_sq(tgt, xid);
1040
1041 /* Set flag that cleanup request is pending with the firmware */
1042 set_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
1043
1044 /* Ring doorbell */
1045 bnx2fc_ring_doorbell(tgt);
1046
1047 cleanup_err:
1048 return rc;
1049 }
1050
1051 /**
1052 * bnx2fc_eh_target_reset: Reset a target
1053 *
1054 * @sc_cmd: SCSI command
1055 *
1056 * Set from SCSI host template to send task mgmt command to the target
1057 * and wait for the response
1058 */
1059 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1060 {
1061 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1062 struct fc_lport *lport = shost_priv(rport_to_shost(rport));
1063
1064 return bnx2fc_initiate_tmf(lport, rport, 0, FCP_TMF_TGT_RESET);
1065 }
1066
1067 /**
1068 * bnx2fc_eh_device_reset - Reset a single LUN
1069 *
1070 * @sc_cmd: SCSI command
1071 *
1072 * Set from SCSI host template to send task mgmt command to the target
1073 * and wait for the response
1074 */
1075 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1076 {
1077 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1078 struct fc_lport *lport = shost_priv(rport_to_shost(rport));
1079
1080 return bnx2fc_initiate_tmf(lport, rport, sc_cmd->device->lun,
1081 FCP_TMF_LUN_RESET);
1082 }
1083
1084 static int bnx2fc_abts_cleanup(struct bnx2fc_cmd *io_req)
1085 __must_hold(&tgt->tgt_lock)
1086 {
1087 struct bnx2fc_rport *tgt = io_req->tgt;
1088 unsigned int time_left;
1089
1090 init_completion(&io_req->cleanup_done);
1091 io_req->wait_for_cleanup_comp = 1;
1092 bnx2fc_initiate_cleanup(io_req);
1093
1094 spin_unlock_bh(&tgt->tgt_lock);
1095
1096 /*
1097 * Can't wait forever on cleanup response lest we let the SCSI error
1098 * handler wait forever
1099 */
1100 time_left = wait_for_completion_timeout(&io_req->cleanup_done,
1101 BNX2FC_FW_TIMEOUT);
1102 if (!time_left) {
1103 BNX2FC_IO_DBG(io_req, "%s(): Wait for cleanup timed out.\n",
1104 __func__);
1105
1106 /*
1107 * Put the extra reference to the SCSI command since it would
1108 * not have been returned in this case.
1109 */
1110 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1111 }
1112
1113 spin_lock_bh(&tgt->tgt_lock);
1114 io_req->wait_for_cleanup_comp = 0;
1115 return SUCCESS;
1116 }
1117
1118 /**
1119 * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1120 * SCSI command
1121 *
1122 * @sc_cmd: SCSI_ML command pointer
1123 *
1124 * SCSI abort request handler
1125 */
1126 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1127 {
1128 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1129 struct fc_rport_libfc_priv *rp = rport->dd_data;
1130 struct bnx2fc_cmd *io_req;
1131 struct fc_lport *lport;
1132 struct bnx2fc_rport *tgt;
1133 int rc;
1134 unsigned int time_left;
1135
1136 rc = fc_block_scsi_eh(sc_cmd);
1137 if (rc)
1138 return rc;
1139
1140 lport = shost_priv(sc_cmd->device->host);
1141 if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1142 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1143 return FAILED;
1144 }
1145
1146 tgt = (struct bnx2fc_rport *)&rp[1];
1147
1148 BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1149
1150 spin_lock_bh(&tgt->tgt_lock);
1151 io_req = bnx2fc_priv(sc_cmd)->io_req;
1152 if (!io_req) {
1153 /* Command might have just completed */
1154 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1155 spin_unlock_bh(&tgt->tgt_lock);
1156 return SUCCESS;
1157 }
1158 BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1159 kref_read(&io_req->refcount));
1160
1161 /* Hold IO request across abort processing */
1162 kref_get(&io_req->refcount);
1163
1164 BUG_ON(tgt != io_req->tgt);
1165
1166 /* Remove the io_req from the active_q. */
1167 /*
1168 * Task Mgmt functions (LUN RESET & TGT RESET) will not
1169 * issue an ABTS on this particular IO req, as the
1170 * io_req is no longer in the active_q.
1171 */
1172 if (tgt->flush_in_prog) {
1173 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1174 "flush in progress\n", io_req->xid);
1175 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1176 spin_unlock_bh(&tgt->tgt_lock);
1177 return SUCCESS;
1178 }
1179
1180 if (io_req->on_active_queue == 0) {
1181 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1182 "not on active_q\n", io_req->xid);
1183 /*
1184 * The IO is still with the FW.
1185 * Return failure and let SCSI-ml retry eh_abort.
1186 */
1187 spin_unlock_bh(&tgt->tgt_lock);
1188 return FAILED;
1189 }
1190
1191 /*
1192 * Only eh_abort processing will remove the IO from
1193 * active_cmd_q before processing the request. this is
1194 * done to avoid race conditions between IOs aborted
1195 * as part of task management completion and eh_abort
1196 * processing
1197 */
1198 list_del_init(&io_req->link);
1199 io_req->on_active_queue = 0;
1200 /* Move IO req to retire queue */
1201 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1202
1203 init_completion(&io_req->abts_done);
1204 init_completion(&io_req->cleanup_done);
1205
1206 if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1207 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1208 "already in abts processing\n", io_req->xid);
1209 if (cancel_delayed_work(&io_req->timeout_work))
1210 kref_put(&io_req->refcount,
1211 bnx2fc_cmd_release); /* drop timer hold */
1212 /*
1213 * We don't want to hold off the upper layer timer so simply
1214 * cleanup the command and return that I/O was successfully
1215 * aborted.
1216 */
1217 bnx2fc_abts_cleanup(io_req);
1218 /* This only occurs when an task abort was requested while ABTS
1219 is in progress. Setting the IO_CLEANUP flag will skip the
1220 RRQ process in the case when the fw generated SCSI_CMD cmpl
1221 was a result from the ABTS request rather than the CLEANUP
1222 request */
1223 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1224 rc = FAILED;
1225 goto done;
1226 }
1227
1228 /* Cancel the current timer running on this io_req */
1229 if (cancel_delayed_work(&io_req->timeout_work))
1230 kref_put(&io_req->refcount,
1231 bnx2fc_cmd_release); /* drop timer hold */
1232 set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1233 io_req->wait_for_abts_comp = 1;
1234 rc = bnx2fc_initiate_abts(io_req);
1235 if (rc == FAILED) {
1236 io_req->wait_for_cleanup_comp = 1;
1237 bnx2fc_initiate_cleanup(io_req);
1238 spin_unlock_bh(&tgt->tgt_lock);
1239 wait_for_completion(&io_req->cleanup_done);
1240 spin_lock_bh(&tgt->tgt_lock);
1241 io_req->wait_for_cleanup_comp = 0;
1242 goto done;
1243 }
1244 spin_unlock_bh(&tgt->tgt_lock);
1245
1246 /* Wait 2 * RA_TOV + 1 to be sure timeout function hasn't fired */
1247 time_left = wait_for_completion_timeout(&io_req->abts_done,
1248 msecs_to_jiffies(2 * rp->r_a_tov + 1));
1249 if (time_left)
1250 BNX2FC_IO_DBG(io_req,
1251 "Timed out in eh_abort waiting for abts_done");
1252
1253 spin_lock_bh(&tgt->tgt_lock);
1254 io_req->wait_for_abts_comp = 0;
1255 if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1256 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1257 rc = SUCCESS;
1258 } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1259 &io_req->req_flags))) {
1260 /* Let the scsi-ml try to recover this command */
1261 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1262 io_req->xid);
1263 /*
1264 * Cleanup firmware residuals before returning control back
1265 * to SCSI ML.
1266 */
1267 rc = bnx2fc_abts_cleanup(io_req);
1268 goto done;
1269 } else {
1270 /*
1271 * We come here even when there was a race condition
1272 * between timeout and abts completion, and abts
1273 * completion happens just in time.
1274 */
1275 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1276 rc = SUCCESS;
1277 bnx2fc_scsi_done(io_req, DID_ABORT);
1278 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1279 }
1280 done:
1281 /* release the reference taken in eh_abort */
1282 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1283 spin_unlock_bh(&tgt->tgt_lock);
1284 return rc;
1285 }
1286
1287 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1288 struct fcoe_task_ctx_entry *task,
1289 u8 rx_state)
1290 {
1291 struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1292 struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1293 u32 offset = cb_arg->offset;
1294 enum fc_rctl r_ctl = cb_arg->r_ctl;
1295 int rc = 0;
1296 struct bnx2fc_rport *tgt = orig_io_req->tgt;
1297
1298 BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1299 "cmd_type = %d\n",
1300 seq_clnp_req->xid, seq_clnp_req->cmd_type);
1301
1302 if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1303 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1304 seq_clnp_req->xid);
1305 goto free_cb_arg;
1306 }
1307
1308 spin_unlock_bh(&tgt->tgt_lock);
1309 rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1310 spin_lock_bh(&tgt->tgt_lock);
1311
1312 if (rc)
1313 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1314 " IO will abort\n");
1315 seq_clnp_req->cb_arg = NULL;
1316 kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1317 free_cb_arg:
1318 kfree(cb_arg);
1319 return;
1320 }
1321
1322 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1323 struct fcoe_task_ctx_entry *task,
1324 u8 num_rq)
1325 {
1326 BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1327 "refcnt = %d, cmd_type = %d\n",
1328 kref_read(&io_req->refcount), io_req->cmd_type);
1329 /*
1330 * Test whether there is a cleanup request pending. If not just
1331 * exit.
1332 */
1333 if (!test_and_clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ,
1334 &io_req->req_flags))
1335 return;
1336 /*
1337 * If we receive a cleanup completion for this request then the
1338 * firmware will not give us an abort completion for this request
1339 * so clear any ABTS pending flags.
1340 */
1341 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags) &&
1342 !test_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags)) {
1343 set_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags);
1344 if (io_req->wait_for_abts_comp)
1345 complete(&io_req->abts_done);
1346 }
1347
1348 bnx2fc_scsi_done(io_req, DID_ERROR);
1349 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1350 if (io_req->wait_for_cleanup_comp)
1351 complete(&io_req->cleanup_done);
1352 }
1353
1354 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1355 struct fcoe_task_ctx_entry *task,
1356 u8 num_rq)
1357 {
1358 u32 r_ctl;
1359 u32 r_a_tov = FC_DEF_R_A_TOV;
1360 u8 issue_rrq = 0;
1361 struct bnx2fc_rport *tgt = io_req->tgt;
1362
1363 BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1364 "refcnt = %d, cmd_type = %d\n",
1365 io_req->xid,
1366 kref_read(&io_req->refcount), io_req->cmd_type);
1367
1368 if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1369 &io_req->req_flags)) {
1370 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1371 " this io\n");
1372 return;
1373 }
1374
1375 /*
1376 * If we receive an ABTS completion here then we will not receive
1377 * a cleanup completion so clear any cleanup pending flags.
1378 */
1379 if (test_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags)) {
1380 clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
1381 if (io_req->wait_for_cleanup_comp)
1382 complete(&io_req->cleanup_done);
1383 }
1384
1385 /* Do not issue RRQ as this IO is already cleanedup */
1386 if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1387 &io_req->req_flags))
1388 goto io_compl;
1389
1390 /*
1391 * For ABTS issued due to SCSI eh_abort_handler, timeout
1392 * values are maintained by scsi-ml itself. Cancel timeout
1393 * in case ABTS issued as part of task management function
1394 * or due to FW error.
1395 */
1396 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1397 if (cancel_delayed_work(&io_req->timeout_work))
1398 kref_put(&io_req->refcount,
1399 bnx2fc_cmd_release); /* drop timer hold */
1400
1401 r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1402
1403 switch (r_ctl) {
1404 case FC_RCTL_BA_ACC:
1405 /*
1406 * Dont release this cmd yet. It will be relesed
1407 * after we get RRQ response
1408 */
1409 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1410 issue_rrq = 1;
1411 break;
1412
1413 case FC_RCTL_BA_RJT:
1414 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1415 break;
1416 default:
1417 printk(KERN_ERR PFX "Unknown ABTS response\n");
1418 break;
1419 }
1420
1421 if (issue_rrq) {
1422 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1423 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1424 }
1425 set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1426 bnx2fc_cmd_timer_set(io_req, r_a_tov);
1427
1428 io_compl:
1429 if (io_req->wait_for_abts_comp) {
1430 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1431 &io_req->req_flags))
1432 complete(&io_req->abts_done);
1433 } else {
1434 /*
1435 * We end up here when ABTS is issued as
1436 * in asynchronous context, i.e., as part
1437 * of task management completion, or
1438 * when FW error is received or when the
1439 * ABTS is issued when the IO is timed
1440 * out.
1441 */
1442
1443 if (io_req->on_active_queue) {
1444 list_del_init(&io_req->link);
1445 io_req->on_active_queue = 0;
1446 /* Move IO req to retire queue */
1447 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1448 }
1449 bnx2fc_scsi_done(io_req, DID_ERROR);
1450 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1451 }
1452 }
1453
1454 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1455 {
1456 struct bnx2fc_rport *tgt = io_req->tgt;
1457 struct bnx2fc_cmd *cmd, *tmp;
1458 struct bnx2fc_mp_req *tm_req = &io_req->mp_req;
1459 u64 lun;
1460 int rc = 0;
1461
1462 /* called with tgt_lock held */
1463 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1464 /*
1465 * Walk thru the active_ios queue and ABORT the IO
1466 * that matches with the LUN that was reset
1467 */
1468 list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1469 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1470 if (!cmd->sc_cmd)
1471 continue;
1472 lun = cmd->sc_cmd->device->lun;
1473 if (lun == tm_req->tm_lun) {
1474 /* Initiate ABTS on this cmd */
1475 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1476 &cmd->req_flags)) {
1477 /* cancel the IO timeout */
1478 if (cancel_delayed_work(&io_req->timeout_work))
1479 kref_put(&io_req->refcount,
1480 bnx2fc_cmd_release);
1481 /* timer hold */
1482 rc = bnx2fc_initiate_abts(cmd);
1483 /* abts shouldn't fail in this context */
1484 WARN_ON(rc != SUCCESS);
1485 } else
1486 printk(KERN_ERR PFX "lun_rst: abts already in"
1487 " progress for this IO 0x%x\n",
1488 cmd->xid);
1489 }
1490 }
1491 }
1492
1493 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1494 {
1495 struct bnx2fc_rport *tgt = io_req->tgt;
1496 struct bnx2fc_cmd *cmd, *tmp;
1497 int rc = 0;
1498
1499 /* called with tgt_lock held */
1500 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1501 /*
1502 * Walk thru the active_ios queue and ABORT the IO
1503 * that matches with the LUN that was reset
1504 */
1505 list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1506 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1507 /* Initiate ABTS */
1508 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1509 &cmd->req_flags)) {
1510 /* cancel the IO timeout */
1511 if (cancel_delayed_work(&io_req->timeout_work))
1512 kref_put(&io_req->refcount,
1513 bnx2fc_cmd_release); /* timer hold */
1514 rc = bnx2fc_initiate_abts(cmd);
1515 /* abts shouldn't fail in this context */
1516 WARN_ON(rc != SUCCESS);
1517
1518 } else
1519 printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1520 " for this IO 0x%x\n", cmd->xid);
1521 }
1522 }
1523
1524 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1525 struct fcoe_task_ctx_entry *task, u8 num_rq,
1526 unsigned char *rq_data)
1527 {
1528 struct bnx2fc_mp_req *tm_req;
1529 struct fc_frame_header *fc_hdr;
1530 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1531 u64 *hdr;
1532 u64 *temp_hdr;
1533 void *rsp_buf;
1534
1535 /* Called with tgt_lock held */
1536 BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1537
1538 if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1539 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1540 else {
1541 /* TM has already timed out and we got
1542 * delayed completion. Ignore completion
1543 * processing.
1544 */
1545 return;
1546 }
1547
1548 tm_req = &(io_req->mp_req);
1549 fc_hdr = &(tm_req->resp_fc_hdr);
1550 hdr = (u64 *)fc_hdr;
1551 temp_hdr = (u64 *)
1552 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1553 hdr[0] = cpu_to_be64(temp_hdr[0]);
1554 hdr[1] = cpu_to_be64(temp_hdr[1]);
1555 hdr[2] = cpu_to_be64(temp_hdr[2]);
1556
1557 tm_req->resp_len =
1558 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1559
1560 rsp_buf = tm_req->resp_buf;
1561
1562 if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1563 bnx2fc_parse_fcp_rsp(io_req,
1564 (struct fcoe_fcp_rsp_payload *)
1565 rsp_buf, num_rq, rq_data);
1566 if (io_req->fcp_rsp_code == 0) {
1567 /* TM successful */
1568 if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1569 bnx2fc_lun_reset_cmpl(io_req);
1570 else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1571 bnx2fc_tgt_reset_cmpl(io_req);
1572 }
1573 } else {
1574 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1575 fc_hdr->fh_r_ctl);
1576 }
1577 if (sc_cmd) {
1578 if (!bnx2fc_priv(sc_cmd)->io_req) {
1579 printk(KERN_ERR PFX "tm_compl: io_req is NULL\n");
1580 return;
1581 }
1582 switch (io_req->fcp_status) {
1583 case FC_GOOD:
1584 if (io_req->cdb_status == 0) {
1585 /* Good IO completion */
1586 sc_cmd->result = DID_OK << 16;
1587 } else {
1588 /* Transport status is good, SCSI status not good */
1589 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1590 }
1591 if (io_req->fcp_resid)
1592 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1593 break;
1594
1595 default:
1596 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1597 io_req->fcp_status);
1598 break;
1599 }
1600
1601 sc_cmd = io_req->sc_cmd;
1602 io_req->sc_cmd = NULL;
1603
1604 bnx2fc_priv(sc_cmd)->io_req = NULL;
1605 scsi_done(sc_cmd);
1606 }
1607
1608 /* check if the io_req exists in tgt's tmf_q */
1609 if (io_req->on_tmf_queue) {
1610
1611 list_del_init(&io_req->link);
1612 io_req->on_tmf_queue = 0;
1613 } else {
1614
1615 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1616 return;
1617 }
1618
1619 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1620 if (io_req->wait_for_abts_comp) {
1621 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1622 complete(&io_req->abts_done);
1623 }
1624 }
1625
1626 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1627 int bd_index)
1628 {
1629 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1630 int frag_size, sg_frags;
1631
1632 sg_frags = 0;
1633 while (sg_len) {
1634 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1635 frag_size = BNX2FC_BD_SPLIT_SZ;
1636 else
1637 frag_size = sg_len;
1638 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1639 bd[bd_index + sg_frags].buf_addr_hi = addr >> 32;
1640 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1641 bd[bd_index + sg_frags].flags = 0;
1642
1643 addr += (u64) frag_size;
1644 sg_frags++;
1645 sg_len -= frag_size;
1646 }
1647 return sg_frags;
1648
1649 }
1650
1651 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1652 {
1653 struct bnx2fc_interface *interface = io_req->port->priv;
1654 struct bnx2fc_hba *hba = interface->hba;
1655 struct scsi_cmnd *sc = io_req->sc_cmd;
1656 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1657 struct scatterlist *sg;
1658 int byte_count = 0;
1659 int sg_count = 0;
1660 int bd_count = 0;
1661 int sg_frags;
1662 unsigned int sg_len;
1663 u64 addr;
1664 int i;
1665
1666 WARN_ON(scsi_sg_count(sc) > BNX2FC_MAX_BDS_PER_CMD);
1667 /*
1668 * Use dma_map_sg directly to ensure we're using the correct
1669 * dev struct off of pcidev.
1670 */
1671 sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1672 scsi_sg_count(sc), sc->sc_data_direction);
1673 scsi_for_each_sg(sc, sg, sg_count, i) {
1674 sg_len = sg_dma_len(sg);
1675 addr = sg_dma_address(sg);
1676 if (sg_len > BNX2FC_MAX_BD_LEN) {
1677 sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1678 bd_count);
1679 } else {
1680
1681 sg_frags = 1;
1682 bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1683 bd[bd_count].buf_addr_hi = addr >> 32;
1684 bd[bd_count].buf_len = (u16)sg_len;
1685 bd[bd_count].flags = 0;
1686 }
1687 bd_count += sg_frags;
1688 byte_count += sg_len;
1689 }
1690 if (byte_count != scsi_bufflen(sc))
1691 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1692 "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1693 io_req->xid);
1694 return bd_count;
1695 }
1696
1697 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1698 {
1699 struct scsi_cmnd *sc = io_req->sc_cmd;
1700 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1701 int bd_count;
1702
1703 if (scsi_sg_count(sc)) {
1704 bd_count = bnx2fc_map_sg(io_req);
1705 if (bd_count == 0)
1706 return -ENOMEM;
1707 } else {
1708 bd_count = 0;
1709 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1710 bd[0].buf_len = bd[0].flags = 0;
1711 }
1712 io_req->bd_tbl->bd_valid = bd_count;
1713
1714 /*
1715 * Return the command to ML if BD count exceeds the max number
1716 * that can be handled by FW.
1717 */
1718 if (bd_count > BNX2FC_FW_MAX_BDS_PER_CMD) {
1719 pr_err("bd_count = %d exceeded FW supported max BD(255), task_id = 0x%x\n",
1720 bd_count, io_req->xid);
1721 return -ENOMEM;
1722 }
1723
1724 return 0;
1725 }
1726
1727 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1728 {
1729 struct scsi_cmnd *sc = io_req->sc_cmd;
1730 struct bnx2fc_interface *interface = io_req->port->priv;
1731 struct bnx2fc_hba *hba = interface->hba;
1732
1733 /*
1734 * Use dma_unmap_sg directly to ensure we're using the correct
1735 * dev struct off of pcidev.
1736 */
1737 if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1738 dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
1739 scsi_sg_count(sc), sc->sc_data_direction);
1740 io_req->bd_tbl->bd_valid = 0;
1741 }
1742 }
1743
1744 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1745 struct fcp_cmnd *fcp_cmnd)
1746 {
1747 memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1748
1749 fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1750 fcp_cmnd->fc_cmdref = 0;
1751 fcp_cmnd->fc_pri_ta = 0;
1752 fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1753 fcp_cmnd->fc_flags = io_req->io_req_flags;
1754 fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1755 }
1756
1757 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1758 struct fcoe_fcp_rsp_payload *fcp_rsp,
1759 u8 num_rq, unsigned char *rq_data)
1760 {
1761 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1762 u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1763 u32 rq_buff_len = 0;
1764 int fcp_sns_len = 0;
1765 int fcp_rsp_len = 0;
1766
1767 io_req->fcp_status = FC_GOOD;
1768 io_req->fcp_resid = 0;
1769 if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1770 FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1771 io_req->fcp_resid = fcp_rsp->fcp_resid;
1772
1773 io_req->scsi_comp_flags = rsp_flags;
1774 io_req->cdb_status = fcp_rsp->scsi_status_code;
1775
1776 /* Fetch fcp_rsp_info and fcp_sns_info if available */
1777 if (num_rq) {
1778
1779 /*
1780 * We do not anticipate num_rq >1, as the linux defined
1781 * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1782 * 256 bytes of single rq buffer is good enough to hold this.
1783 */
1784
1785 if (rsp_flags &
1786 FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1787 fcp_rsp_len = rq_buff_len
1788 = fcp_rsp->fcp_rsp_len;
1789 }
1790
1791 if (rsp_flags &
1792 FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1793 fcp_sns_len = fcp_rsp->fcp_sns_len;
1794 rq_buff_len += fcp_rsp->fcp_sns_len;
1795 }
1796
1797 io_req->fcp_rsp_len = fcp_rsp_len;
1798 io_req->fcp_sns_len = fcp_sns_len;
1799
1800 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1801 /* Invalid sense sense length. */
1802 printk(KERN_ERR PFX "invalid sns length %d\n",
1803 rq_buff_len);
1804 /* reset rq_buff_len */
1805 rq_buff_len = num_rq * BNX2FC_RQ_BUF_SZ;
1806 }
1807
1808 /* fetch fcp_rsp_code */
1809 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1810 /* Only for task management function */
1811 io_req->fcp_rsp_code = rq_data[3];
1812 BNX2FC_IO_DBG(io_req, "fcp_rsp_code = %d\n",
1813 io_req->fcp_rsp_code);
1814 }
1815
1816 /* fetch sense data */
1817 rq_data += fcp_rsp_len;
1818
1819 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1820 printk(KERN_ERR PFX "Truncating sense buffer\n");
1821 fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1822 }
1823
1824 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1825 if (fcp_sns_len)
1826 memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1827
1828 }
1829 }
1830
1831 /**
1832 * bnx2fc_queuecommand - Queuecommand function of the scsi template
1833 *
1834 * @host: The Scsi_Host the command was issued to
1835 * @sc_cmd: struct scsi_cmnd to be executed
1836 *
1837 * This is the IO strategy routine, called by SCSI-ML
1838 **/
1839 int bnx2fc_queuecommand(struct Scsi_Host *host,
1840 struct scsi_cmnd *sc_cmd)
1841 {
1842 struct fc_lport *lport = shost_priv(host);
1843 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1844 struct fc_rport_libfc_priv *rp = rport->dd_data;
1845 struct bnx2fc_rport *tgt;
1846 struct bnx2fc_cmd *io_req;
1847 int rc = 0;
1848 int rval;
1849
1850 rval = fc_remote_port_chkready(rport);
1851 if (rval) {
1852 sc_cmd->result = rval;
1853 scsi_done(sc_cmd);
1854 return 0;
1855 }
1856
1857 if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1858 rc = SCSI_MLQUEUE_HOST_BUSY;
1859 goto exit_qcmd;
1860 }
1861
1862 /* rport and tgt are allocated together, so tgt should be non-NULL */
1863 tgt = (struct bnx2fc_rport *)&rp[1];
1864
1865 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1866 /*
1867 * Session is not offloaded yet. Let SCSI-ml retry
1868 * the command.
1869 */
1870 rc = SCSI_MLQUEUE_TARGET_BUSY;
1871 goto exit_qcmd;
1872 }
1873 if (tgt->retry_delay_timestamp) {
1874 if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1875 tgt->retry_delay_timestamp = 0;
1876 } else {
1877 /* If retry_delay timer is active, flow off the ML */
1878 rc = SCSI_MLQUEUE_TARGET_BUSY;
1879 goto exit_qcmd;
1880 }
1881 }
1882
1883 spin_lock_bh(&tgt->tgt_lock);
1884
1885 io_req = bnx2fc_cmd_alloc(tgt);
1886 if (!io_req) {
1887 rc = SCSI_MLQUEUE_HOST_BUSY;
1888 goto exit_qcmd_tgtlock;
1889 }
1890 io_req->sc_cmd = sc_cmd;
1891
1892 if (bnx2fc_post_io_req(tgt, io_req)) {
1893 printk(KERN_ERR PFX "Unable to post io_req\n");
1894 rc = SCSI_MLQUEUE_HOST_BUSY;
1895 goto exit_qcmd_tgtlock;
1896 }
1897
1898 exit_qcmd_tgtlock:
1899 spin_unlock_bh(&tgt->tgt_lock);
1900 exit_qcmd:
1901 return rc;
1902 }
1903
1904 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1905 struct fcoe_task_ctx_entry *task,
1906 u8 num_rq, unsigned char *rq_data)
1907 {
1908 struct fcoe_fcp_rsp_payload *fcp_rsp;
1909 struct bnx2fc_rport *tgt = io_req->tgt;
1910 struct scsi_cmnd *sc_cmd;
1911 u16 scope = 0, qualifier = 0;
1912
1913 /* scsi_cmd_cmpl is called with tgt lock held */
1914
1915 if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1916 /* we will not receive ABTS response for this IO */
1917 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1918 "this scsi cmd\n");
1919 if (test_and_clear_bit(BNX2FC_FLAG_IO_CLEANUP,
1920 &io_req->req_flags)) {
1921 BNX2FC_IO_DBG(io_req,
1922 "Actual completion after cleanup request cleaning up\n");
1923 bnx2fc_process_cleanup_compl(io_req, task, num_rq);
1924 }
1925 return;
1926 }
1927
1928 /* Cancel the timeout_work, as we received IO completion */
1929 if (cancel_delayed_work(&io_req->timeout_work))
1930 kref_put(&io_req->refcount,
1931 bnx2fc_cmd_release); /* drop timer hold */
1932
1933 sc_cmd = io_req->sc_cmd;
1934 if (sc_cmd == NULL) {
1935 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1936 return;
1937 }
1938
1939 /* Fetch fcp_rsp from task context and perform cmd completion */
1940 fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1941 &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1942
1943 /* parse fcp_rsp and obtain sense data from RQ if available */
1944 bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq, rq_data);
1945
1946 if (!bnx2fc_priv(sc_cmd)->io_req) {
1947 printk(KERN_ERR PFX "io_req is NULL\n");
1948 return;
1949 }
1950
1951 if (io_req->on_active_queue) {
1952 list_del_init(&io_req->link);
1953 io_req->on_active_queue = 0;
1954 /* Move IO req to retire queue */
1955 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1956 } else {
1957 /* This should not happen, but could have been pulled
1958 * by bnx2fc_flush_active_ios(), or during a race
1959 * between command abort and (late) completion.
1960 */
1961 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1962 if (io_req->wait_for_abts_comp)
1963 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1964 &io_req->req_flags))
1965 complete(&io_req->abts_done);
1966 }
1967
1968 bnx2fc_unmap_sg_list(io_req);
1969 io_req->sc_cmd = NULL;
1970
1971 switch (io_req->fcp_status) {
1972 case FC_GOOD:
1973 if (io_req->cdb_status == 0) {
1974 /* Good IO completion */
1975 sc_cmd->result = DID_OK << 16;
1976 } else {
1977 /* Transport status is good, SCSI status not good */
1978 BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1979 " fcp_resid = 0x%x\n",
1980 io_req->cdb_status, io_req->fcp_resid);
1981 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1982
1983 if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1984 io_req->cdb_status == SAM_STAT_BUSY) {
1985 /* Newer array firmware with BUSY or
1986 * TASK_SET_FULL may return a status that needs
1987 * the scope bits masked.
1988 * Or a huge delay timestamp up to 27 minutes
1989 * can result.
1990 */
1991 if (fcp_rsp->retry_delay_timer) {
1992 /* Upper 2 bits */
1993 scope = fcp_rsp->retry_delay_timer
1994 & 0xC000;
1995 /* Lower 14 bits */
1996 qualifier = fcp_rsp->retry_delay_timer
1997 & 0x3FFF;
1998 }
1999 if (scope > 0 && qualifier > 0 &&
2000 qualifier <= 0x3FEF) {
2001 /* Set the jiffies +
2002 * retry_delay_timer * 100ms
2003 * for the rport/tgt
2004 */
2005 tgt->retry_delay_timestamp = jiffies +
2006 (qualifier * HZ / 10);
2007 }
2008 }
2009 }
2010 if (io_req->fcp_resid)
2011 scsi_set_resid(sc_cmd, io_req->fcp_resid);
2012 break;
2013 default:
2014 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
2015 io_req->fcp_status);
2016 break;
2017 }
2018 bnx2fc_priv(sc_cmd)->io_req = NULL;
2019 scsi_done(sc_cmd);
2020 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2021 }
2022
2023 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
2024 struct bnx2fc_cmd *io_req)
2025 {
2026 struct fcoe_task_ctx_entry *task;
2027 struct fcoe_task_ctx_entry *task_page;
2028 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
2029 struct fcoe_port *port = tgt->port;
2030 struct bnx2fc_interface *interface = port->priv;
2031 struct bnx2fc_hba *hba = interface->hba;
2032 struct fc_lport *lport = port->lport;
2033 int task_idx, index;
2034 u16 xid;
2035
2036 /* bnx2fc_post_io_req() is called with the tgt_lock held */
2037
2038 /* Initialize rest of io_req fields */
2039 io_req->cmd_type = BNX2FC_SCSI_CMD;
2040 io_req->port = port;
2041 io_req->tgt = tgt;
2042 io_req->data_xfer_len = scsi_bufflen(sc_cmd);
2043 bnx2fc_priv(sc_cmd)->io_req = io_req;
2044
2045 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
2046 io_req->io_req_flags = BNX2FC_READ;
2047 this_cpu_inc(lport->stats->InputRequests);
2048 this_cpu_add(lport->stats->InputBytes, io_req->data_xfer_len);
2049 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2050 io_req->io_req_flags = BNX2FC_WRITE;
2051 this_cpu_inc(lport->stats->OutputRequests);
2052 this_cpu_add(lport->stats->OutputBytes, io_req->data_xfer_len);
2053 } else {
2054 io_req->io_req_flags = 0;
2055 this_cpu_inc(lport->stats->ControlRequests);
2056 }
2057
2058 xid = io_req->xid;
2059
2060 /* Build buffer descriptor list for firmware from sg list */
2061 if (bnx2fc_build_bd_list_from_sg(io_req)) {
2062 printk(KERN_ERR PFX "BD list creation failed\n");
2063 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2064 return -EAGAIN;
2065 }
2066
2067 task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2068 index = xid % BNX2FC_TASKS_PER_PAGE;
2069
2070 /* Initialize task context for this IO request */
2071 task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2072 task = &(task_page[index]);
2073 bnx2fc_init_task(io_req, task);
2074
2075 if (tgt->flush_in_prog) {
2076 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2077 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2078 return -EAGAIN;
2079 }
2080
2081 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2082 printk(KERN_ERR PFX "Session not ready...post_io\n");
2083 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2084 return -EAGAIN;
2085 }
2086
2087 /* Time IO req */
2088 if (tgt->io_timeout)
2089 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2090 /* Obtain free SQ entry */
2091 bnx2fc_add_2_sq(tgt, xid);
2092
2093 /* Enqueue the io_req to active_cmd_queue */
2094
2095 io_req->on_active_queue = 1;
2096 /* move io_req from pending_queue to active_queue */
2097 list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2098
2099 /* Ring doorbell */
2100 bnx2fc_ring_doorbell(tgt);
2101 return 0;
2102 }
Kernel DRM miscellaneous fixes and cross-tree changes