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mic: vop: Fix use-after-free on remove
[linux/fpc-iii.git] / drivers / scsi / bnx2fc / bnx2fc_io.c
blob350257c13a5bac433f1fdfbfcdc12dc6698587cb
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);
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->tm_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 sc_cmd->SCp.ptr = NULL;
208 sc_cmd->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->free_list = kcalloc(arr_sz, sizeof(*cmgr->free_list),
244 GFP_KERNEL);
245 if (!cmgr->free_list) {
246 printk(KERN_ERR PFX "failed to alloc free_list\n");
247 goto mem_err;
248 }
249
250 cmgr->free_list_lock = kcalloc(arr_sz, sizeof(*cmgr->free_list_lock),
251 GFP_KERNEL);
252 if (!cmgr->free_list_lock) {
253 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
254 kfree(cmgr->free_list);
255 cmgr->free_list = NULL;
256 goto mem_err;
257 }
258
259 cmgr->hba = hba;
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 = kmalloc(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 = get_cpu();
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 put_cpu();
489 return NULL;
490 }
491
492 listp = (struct list_head *)
493 cmd_mgr->free_list[index].next;
494 list_del_init(listp);
495 io_req = (struct bnx2fc_cmd *) listp;
496 xid = io_req->xid;
497 cmd_mgr->cmds[xid] = io_req;
498 atomic_inc(&tgt->num_active_ios);
499 atomic_dec(&tgt->free_sqes);
500 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
501 put_cpu();
502
503 INIT_LIST_HEAD(&io_req->link);
504
505 io_req->port = port;
506 io_req->cmd_mgr = cmd_mgr;
507 io_req->req_flags = 0;
508
509 /* Bind io_bdt for this io_req */
510 /* Have a static link between io_req and io_bdt_pool */
511 bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
512 bd_tbl->io_req = io_req;
513
514 /* Hold the io_req against deletion */
515 kref_init(&io_req->refcount);
516 return io_req;
517 }
518
519 void bnx2fc_cmd_release(struct kref *ref)
520 {
521 struct bnx2fc_cmd *io_req = container_of(ref,
522 struct bnx2fc_cmd, refcount);
523 struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
524 int index;
525
526 if (io_req->cmd_type == BNX2FC_SCSI_CMD)
527 index = io_req->xid % num_possible_cpus();
528 else
529 index = RESERVE_FREE_LIST_INDEX;
530
531
532 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
533 if (io_req->cmd_type != BNX2FC_SCSI_CMD)
534 bnx2fc_free_mp_resc(io_req);
535 cmd_mgr->cmds[io_req->xid] = NULL;
536 /* Delete IO from retire queue */
537 list_del_init(&io_req->link);
538 /* Add it to the free list */
539 list_add(&io_req->link,
540 &cmd_mgr->free_list[index]);
541 atomic_dec(&io_req->tgt->num_active_ios);
542 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
543
544 }
545
546 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
547 {
548 struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
549 struct bnx2fc_interface *interface = io_req->port->priv;
550 struct bnx2fc_hba *hba = interface->hba;
551 size_t sz = sizeof(struct fcoe_bd_ctx);
552
553 /* clear tm flags */
554 mp_req->tm_flags = 0;
555 if (mp_req->mp_req_bd) {
556 dma_free_coherent(&hba->pcidev->dev, sz,
557 mp_req->mp_req_bd,
558 mp_req->mp_req_bd_dma);
559 mp_req->mp_req_bd = NULL;
560 }
561 if (mp_req->mp_resp_bd) {
562 dma_free_coherent(&hba->pcidev->dev, sz,
563 mp_req->mp_resp_bd,
564 mp_req->mp_resp_bd_dma);
565 mp_req->mp_resp_bd = NULL;
566 }
567 if (mp_req->req_buf) {
568 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
569 mp_req->req_buf,
570 mp_req->req_buf_dma);
571 mp_req->req_buf = NULL;
572 }
573 if (mp_req->resp_buf) {
574 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
575 mp_req->resp_buf,
576 mp_req->resp_buf_dma);
577 mp_req->resp_buf = NULL;
578 }
579 }
580
581 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
582 {
583 struct bnx2fc_mp_req *mp_req;
584 struct fcoe_bd_ctx *mp_req_bd;
585 struct fcoe_bd_ctx *mp_resp_bd;
586 struct bnx2fc_interface *interface = io_req->port->priv;
587 struct bnx2fc_hba *hba = interface->hba;
588 dma_addr_t addr;
589 size_t sz;
590
591 mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
592 memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
593
594 if (io_req->cmd_type != BNX2FC_ELS) {
595 mp_req->req_len = sizeof(struct fcp_cmnd);
596 io_req->data_xfer_len = mp_req->req_len;
597 } else
598 mp_req->req_len = io_req->data_xfer_len;
599
600 mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
601 &mp_req->req_buf_dma,
602 GFP_ATOMIC);
603 if (!mp_req->req_buf) {
604 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
605 bnx2fc_free_mp_resc(io_req);
606 return FAILED;
607 }
608
609 mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
610 &mp_req->resp_buf_dma,
611 GFP_ATOMIC);
612 if (!mp_req->resp_buf) {
613 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
614 bnx2fc_free_mp_resc(io_req);
615 return FAILED;
616 }
617 memset(mp_req->req_buf, 0, CNIC_PAGE_SIZE);
618 memset(mp_req->resp_buf, 0, CNIC_PAGE_SIZE);
619
620 /* Allocate and map mp_req_bd and mp_resp_bd */
621 sz = sizeof(struct fcoe_bd_ctx);
622 mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
623 &mp_req->mp_req_bd_dma,
624 GFP_ATOMIC);
625 if (!mp_req->mp_req_bd) {
626 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
627 bnx2fc_free_mp_resc(io_req);
628 return FAILED;
629 }
630 mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
631 &mp_req->mp_resp_bd_dma,
632 GFP_ATOMIC);
633 if (!mp_req->mp_resp_bd) {
634 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
635 bnx2fc_free_mp_resc(io_req);
636 return FAILED;
637 }
638 /* Fill bd table */
639 addr = mp_req->req_buf_dma;
640 mp_req_bd = mp_req->mp_req_bd;
641 mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
642 mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
643 mp_req_bd->buf_len = CNIC_PAGE_SIZE;
644 mp_req_bd->flags = 0;
645
646 /*
647 * MP buffer is either a task mgmt command or an ELS.
648 * So the assumption is that it consumes a single bd
649 * entry in the bd table
650 */
651 mp_resp_bd = mp_req->mp_resp_bd;
652 addr = mp_req->resp_buf_dma;
653 mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
654 mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
655 mp_resp_bd->buf_len = CNIC_PAGE_SIZE;
656 mp_resp_bd->flags = 0;
657
658 return SUCCESS;
659 }
660
661 static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
662 {
663 struct fc_lport *lport;
664 struct fc_rport *rport;
665 struct fc_rport_libfc_priv *rp;
666 struct fcoe_port *port;
667 struct bnx2fc_interface *interface;
668 struct bnx2fc_rport *tgt;
669 struct bnx2fc_cmd *io_req;
670 struct bnx2fc_mp_req *tm_req;
671 struct fcoe_task_ctx_entry *task;
672 struct fcoe_task_ctx_entry *task_page;
673 struct Scsi_Host *host = sc_cmd->device->host;
674 struct fc_frame_header *fc_hdr;
675 struct fcp_cmnd *fcp_cmnd;
676 int task_idx, index;
677 int rc = SUCCESS;
678 u16 xid;
679 u32 sid, did;
680 unsigned long start = jiffies;
681
682 lport = shost_priv(host);
683 rport = starget_to_rport(scsi_target(sc_cmd->device));
684 port = lport_priv(lport);
685 interface = port->priv;
686
687 if (rport == NULL) {
688 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
689 rc = FAILED;
690 goto tmf_err;
691 }
692 rp = rport->dd_data;
693
694 rc = fc_block_scsi_eh(sc_cmd);
695 if (rc)
696 return rc;
697
698 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
699 printk(KERN_ERR PFX "device_reset: link is not ready\n");
700 rc = FAILED;
701 goto tmf_err;
702 }
703 /* rport and tgt are allocated together, so tgt should be non-NULL */
704 tgt = (struct bnx2fc_rport *)&rp[1];
705
706 if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
707 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
708 rc = FAILED;
709 goto tmf_err;
710 }
711 retry_tmf:
712 io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
713 if (!io_req) {
714 if (time_after(jiffies, start + HZ)) {
715 printk(KERN_ERR PFX "tmf: Failed TMF");
716 rc = FAILED;
717 goto tmf_err;
718 }
719 msleep(20);
720 goto retry_tmf;
721 }
722 /* Initialize rest of io_req fields */
723 io_req->sc_cmd = sc_cmd;
724 io_req->port = port;
725 io_req->tgt = tgt;
726
727 tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
728
729 rc = bnx2fc_init_mp_req(io_req);
730 if (rc == FAILED) {
731 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
732 spin_lock_bh(&tgt->tgt_lock);
733 kref_put(&io_req->refcount, bnx2fc_cmd_release);
734 spin_unlock_bh(&tgt->tgt_lock);
735 goto tmf_err;
736 }
737
738 /* Set TM flags */
739 io_req->io_req_flags = 0;
740 tm_req->tm_flags = tm_flags;
741
742 /* Fill FCP_CMND */
743 bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
744 fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
745 memset(fcp_cmnd->fc_cdb, 0, sc_cmd->cmd_len);
746 fcp_cmnd->fc_dl = 0;
747
748 /* Fill FC header */
749 fc_hdr = &(tm_req->req_fc_hdr);
750 sid = tgt->sid;
751 did = rport->port_id;
752 __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
753 FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
754 FC_FC_SEQ_INIT, 0);
755 /* Obtain exchange id */
756 xid = io_req->xid;
757
758 BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
759 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
760 index = xid % BNX2FC_TASKS_PER_PAGE;
761
762 /* Initialize task context for this IO request */
763 task_page = (struct fcoe_task_ctx_entry *)
764 interface->hba->task_ctx[task_idx];
765 task = &(task_page[index]);
766 bnx2fc_init_mp_task(io_req, task);
767
768 sc_cmd->SCp.ptr = (char *)io_req;
769
770 /* Obtain free SQ entry */
771 spin_lock_bh(&tgt->tgt_lock);
772 bnx2fc_add_2_sq(tgt, xid);
773
774 /* Enqueue the io_req to active_tm_queue */
775 io_req->on_tmf_queue = 1;
776 list_add_tail(&io_req->link, &tgt->active_tm_queue);
777
778 init_completion(&io_req->tm_done);
779 io_req->wait_for_comp = 1;
780
781 /* Ring doorbell */
782 bnx2fc_ring_doorbell(tgt);
783 spin_unlock_bh(&tgt->tgt_lock);
784
785 rc = wait_for_completion_timeout(&io_req->tm_done,
786 interface->tm_timeout * HZ);
787 spin_lock_bh(&tgt->tgt_lock);
788
789 io_req->wait_for_comp = 0;
790 if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
791 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
792 if (io_req->on_tmf_queue) {
793 list_del_init(&io_req->link);
794 io_req->on_tmf_queue = 0;
795 }
796 io_req->wait_for_comp = 1;
797 bnx2fc_initiate_cleanup(io_req);
798 spin_unlock_bh(&tgt->tgt_lock);
799 rc = wait_for_completion_timeout(&io_req->tm_done,
800 BNX2FC_FW_TIMEOUT);
801 spin_lock_bh(&tgt->tgt_lock);
802 io_req->wait_for_comp = 0;
803 if (!rc)
804 kref_put(&io_req->refcount, bnx2fc_cmd_release);
805 }
806
807 spin_unlock_bh(&tgt->tgt_lock);
808
809 if (!rc) {
810 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
811 rc = FAILED;
812 } else {
813 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
814 rc = SUCCESS;
815 }
816 tmf_err:
817 return rc;
818 }
819
820 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
821 {
822 struct fc_lport *lport;
823 struct bnx2fc_rport *tgt = io_req->tgt;
824 struct fc_rport *rport = tgt->rport;
825 struct fc_rport_priv *rdata = tgt->rdata;
826 struct bnx2fc_interface *interface;
827 struct fcoe_port *port;
828 struct bnx2fc_cmd *abts_io_req;
829 struct fcoe_task_ctx_entry *task;
830 struct fcoe_task_ctx_entry *task_page;
831 struct fc_frame_header *fc_hdr;
832 struct bnx2fc_mp_req *abts_req;
833 int task_idx, index;
834 u32 sid, did;
835 u16 xid;
836 int rc = SUCCESS;
837 u32 r_a_tov = rdata->r_a_tov;
838
839 /* called with tgt_lock held */
840 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
841
842 port = io_req->port;
843 interface = port->priv;
844 lport = port->lport;
845
846 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
847 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
848 rc = FAILED;
849 goto abts_err;
850 }
851
852 if (rport == NULL) {
853 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
854 rc = FAILED;
855 goto abts_err;
856 }
857
858 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
859 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
860 rc = FAILED;
861 goto abts_err;
862 }
863
864 abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
865 if (!abts_io_req) {
866 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
867 rc = FAILED;
868 goto abts_err;
869 }
870
871 /* Initialize rest of io_req fields */
872 abts_io_req->sc_cmd = NULL;
873 abts_io_req->port = port;
874 abts_io_req->tgt = tgt;
875 abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
876
877 abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
878 memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
879
880 /* Fill FC header */
881 fc_hdr = &(abts_req->req_fc_hdr);
882
883 /* Obtain oxid and rxid for the original exchange to be aborted */
884 fc_hdr->fh_ox_id = htons(io_req->xid);
885 fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
886
887 sid = tgt->sid;
888 did = rport->port_id;
889
890 __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
891 FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
892 FC_FC_SEQ_INIT, 0);
893
894 xid = abts_io_req->xid;
895 BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
896 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
897 index = xid % BNX2FC_TASKS_PER_PAGE;
898
899 /* Initialize task context for this IO request */
900 task_page = (struct fcoe_task_ctx_entry *)
901 interface->hba->task_ctx[task_idx];
902 task = &(task_page[index]);
903 bnx2fc_init_mp_task(abts_io_req, task);
904
905 /*
906 * ABTS task is a temporary task that will be cleaned up
907 * irrespective of ABTS response. We need to start the timer
908 * for the original exchange, as the CQE is posted for the original
909 * IO request.
910 *
911 * Timer for ABTS is started only when it is originated by a
912 * TM request. For the ABTS issued as part of ULP timeout,
913 * scsi-ml maintains the timers.
914 */
915
916 /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
917 bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
918
919 /* Obtain free SQ entry */
920 bnx2fc_add_2_sq(tgt, xid);
921
922 /* Ring doorbell */
923 bnx2fc_ring_doorbell(tgt);
924
925 abts_err:
926 return rc;
927 }
928
929 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
930 enum fc_rctl r_ctl)
931 {
932 struct fc_lport *lport;
933 struct bnx2fc_rport *tgt = orig_io_req->tgt;
934 struct bnx2fc_interface *interface;
935 struct fcoe_port *port;
936 struct bnx2fc_cmd *seq_clnp_req;
937 struct fcoe_task_ctx_entry *task;
938 struct fcoe_task_ctx_entry *task_page;
939 struct bnx2fc_els_cb_arg *cb_arg = NULL;
940 int task_idx, index;
941 u16 xid;
942 int rc = 0;
943
944 BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
945 orig_io_req->xid);
946 kref_get(&orig_io_req->refcount);
947
948 port = orig_io_req->port;
949 interface = port->priv;
950 lport = port->lport;
951
952 cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
953 if (!cb_arg) {
954 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
955 rc = -ENOMEM;
956 goto cleanup_err;
957 }
958
959 seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
960 if (!seq_clnp_req) {
961 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
962 rc = -ENOMEM;
963 kfree(cb_arg);
964 goto cleanup_err;
965 }
966 /* Initialize rest of io_req fields */
967 seq_clnp_req->sc_cmd = NULL;
968 seq_clnp_req->port = port;
969 seq_clnp_req->tgt = tgt;
970 seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
971
972 xid = seq_clnp_req->xid;
973
974 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
975 index = xid % BNX2FC_TASKS_PER_PAGE;
976
977 /* Initialize task context for this IO request */
978 task_page = (struct fcoe_task_ctx_entry *)
979 interface->hba->task_ctx[task_idx];
980 task = &(task_page[index]);
981 cb_arg->aborted_io_req = orig_io_req;
982 cb_arg->io_req = seq_clnp_req;
983 cb_arg->r_ctl = r_ctl;
984 cb_arg->offset = offset;
985 seq_clnp_req->cb_arg = cb_arg;
986
987 printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
988 bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
989
990 /* Obtain free SQ entry */
991 bnx2fc_add_2_sq(tgt, xid);
992
993 /* Ring doorbell */
994 bnx2fc_ring_doorbell(tgt);
995 cleanup_err:
996 return rc;
997 }
998
999 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1000 {
1001 struct fc_lport *lport;
1002 struct bnx2fc_rport *tgt = io_req->tgt;
1003 struct bnx2fc_interface *interface;
1004 struct fcoe_port *port;
1005 struct bnx2fc_cmd *cleanup_io_req;
1006 struct fcoe_task_ctx_entry *task;
1007 struct fcoe_task_ctx_entry *task_page;
1008 int task_idx, index;
1009 u16 xid, orig_xid;
1010 int rc = 0;
1011
1012 /* ASSUMPTION: called with tgt_lock held */
1013 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1014
1015 port = io_req->port;
1016 interface = port->priv;
1017 lport = port->lport;
1018
1019 cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1020 if (!cleanup_io_req) {
1021 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1022 rc = -1;
1023 goto cleanup_err;
1024 }
1025
1026 /* Initialize rest of io_req fields */
1027 cleanup_io_req->sc_cmd = NULL;
1028 cleanup_io_req->port = port;
1029 cleanup_io_req->tgt = tgt;
1030 cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1031
1032 xid = cleanup_io_req->xid;
1033
1034 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1035 index = xid % BNX2FC_TASKS_PER_PAGE;
1036
1037 /* Initialize task context for this IO request */
1038 task_page = (struct fcoe_task_ctx_entry *)
1039 interface->hba->task_ctx[task_idx];
1040 task = &(task_page[index]);
1041 orig_xid = io_req->xid;
1042
1043 BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1044
1045 bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1046
1047 /* Obtain free SQ entry */
1048 bnx2fc_add_2_sq(tgt, xid);
1049
1050 /* Ring doorbell */
1051 bnx2fc_ring_doorbell(tgt);
1052
1053 cleanup_err:
1054 return rc;
1055 }
1056
1057 /**
1058 * bnx2fc_eh_target_reset: Reset a target
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_target_reset(struct scsi_cmnd *sc_cmd)
1066 {
1067 return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1068 }
1069
1070 /**
1071 * bnx2fc_eh_device_reset - Reset a single LUN
1072 *
1073 * @sc_cmd: SCSI command
1074 *
1075 * Set from SCSI host template to send task mgmt command to the target
1076 * and wait for the response
1077 */
1078 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1079 {
1080 return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1081 }
1082
1083 static int bnx2fc_abts_cleanup(struct bnx2fc_cmd *io_req)
1084 {
1085 struct bnx2fc_rport *tgt = io_req->tgt;
1086 int rc = SUCCESS;
1087 unsigned int time_left;
1088
1089 io_req->wait_for_comp = 1;
1090 bnx2fc_initiate_cleanup(io_req);
1091
1092 spin_unlock_bh(&tgt->tgt_lock);
1093
1094 /*
1095 * Can't wait forever on cleanup response lest we let the SCSI error
1096 * handler wait forever
1097 */
1098 time_left = wait_for_completion_timeout(&io_req->tm_done,
1099 BNX2FC_FW_TIMEOUT);
1100 io_req->wait_for_comp = 0;
1101 if (!time_left)
1102 BNX2FC_IO_DBG(io_req, "%s(): Wait for cleanup timed out.\n",
1103 __func__);
1104
1105 /*
1106 * Release reference held by SCSI command the cleanup completion
1107 * hits the BNX2FC_CLEANUP case in bnx2fc_process_cq_compl() and
1108 * thus the SCSI command is not returnedi by bnx2fc_scsi_done().
1109 */
1110 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1111
1112 spin_lock_bh(&tgt->tgt_lock);
1113 return rc;
1114 }
1115
1116 /**
1117 * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1118 * SCSI command
1119 *
1120 * @sc_cmd: SCSI_ML command pointer
1121 *
1122 * SCSI abort request handler
1123 */
1124 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1125 {
1126 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1127 struct fc_rport_libfc_priv *rp = rport->dd_data;
1128 struct bnx2fc_cmd *io_req;
1129 struct fc_lport *lport;
1130 struct bnx2fc_rport *tgt;
1131 int rc;
1132 unsigned int time_left;
1133
1134 rc = fc_block_scsi_eh(sc_cmd);
1135 if (rc)
1136 return rc;
1137
1138 lport = shost_priv(sc_cmd->device->host);
1139 if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1140 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1141 return FAILED;
1142 }
1143
1144 tgt = (struct bnx2fc_rport *)&rp[1];
1145
1146 BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1147
1148 spin_lock_bh(&tgt->tgt_lock);
1149 io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1150 if (!io_req) {
1151 /* Command might have just completed */
1152 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1153 spin_unlock_bh(&tgt->tgt_lock);
1154 return SUCCESS;
1155 }
1156 BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1157 kref_read(&io_req->refcount));
1158
1159 /* Hold IO request across abort processing */
1160 kref_get(&io_req->refcount);
1161
1162 BUG_ON(tgt != io_req->tgt);
1163
1164 /* Remove the io_req from the active_q. */
1165 /*
1166 * Task Mgmt functions (LUN RESET & TGT RESET) will not
1167 * issue an ABTS on this particular IO req, as the
1168 * io_req is no longer in the active_q.
1169 */
1170 if (tgt->flush_in_prog) {
1171 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1172 "flush in progress\n", io_req->xid);
1173 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1174 spin_unlock_bh(&tgt->tgt_lock);
1175 return SUCCESS;
1176 }
1177
1178 if (io_req->on_active_queue == 0) {
1179 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1180 "not on active_q\n", io_req->xid);
1181 /*
1182 * The IO is still with the FW.
1183 * Return failure and let SCSI-ml retry eh_abort.
1184 */
1185 spin_unlock_bh(&tgt->tgt_lock);
1186 return FAILED;
1187 }
1188
1189 /*
1190 * Only eh_abort processing will remove the IO from
1191 * active_cmd_q before processing the request. this is
1192 * done to avoid race conditions between IOs aborted
1193 * as part of task management completion and eh_abort
1194 * processing
1195 */
1196 list_del_init(&io_req->link);
1197 io_req->on_active_queue = 0;
1198 /* Move IO req to retire queue */
1199 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1200
1201 init_completion(&io_req->tm_done);
1202
1203 if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1204 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1205 "already in abts processing\n", io_req->xid);
1206 if (cancel_delayed_work(&io_req->timeout_work))
1207 kref_put(&io_req->refcount,
1208 bnx2fc_cmd_release); /* drop timer hold */
1209 /*
1210 * We don't want to hold off the upper layer timer so simply
1211 * cleanup the command and return that I/O was successfully
1212 * aborted.
1213 */
1214 rc = bnx2fc_abts_cleanup(io_req);
1215 /* This only occurs when an task abort was requested while ABTS
1216 is in progress. Setting the IO_CLEANUP flag will skip the
1217 RRQ process in the case when the fw generated SCSI_CMD cmpl
1218 was a result from the ABTS request rather than the CLEANUP
1219 request */
1220 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1221 goto done;
1222 }
1223
1224 /* Cancel the current timer running on this io_req */
1225 if (cancel_delayed_work(&io_req->timeout_work))
1226 kref_put(&io_req->refcount,
1227 bnx2fc_cmd_release); /* drop timer hold */
1228 set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1229 io_req->wait_for_comp = 1;
1230 rc = bnx2fc_initiate_abts(io_req);
1231 if (rc == FAILED) {
1232 bnx2fc_initiate_cleanup(io_req);
1233 spin_unlock_bh(&tgt->tgt_lock);
1234 wait_for_completion(&io_req->tm_done);
1235 spin_lock_bh(&tgt->tgt_lock);
1236 io_req->wait_for_comp = 0;
1237 goto done;
1238 }
1239 spin_unlock_bh(&tgt->tgt_lock);
1240
1241 /* Wait 2 * RA_TOV + 1 to be sure timeout function hasn't fired */
1242 time_left = wait_for_completion_timeout(&io_req->tm_done,
1243 (2 * rp->r_a_tov + 1) * HZ);
1244 if (time_left)
1245 BNX2FC_IO_DBG(io_req, "Timed out in eh_abort waiting for tm_done");
1246
1247 spin_lock_bh(&tgt->tgt_lock);
1248 io_req->wait_for_comp = 0;
1249 if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1250 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1251 rc = SUCCESS;
1252 } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1253 &io_req->req_flags))) {
1254 /* Let the scsi-ml try to recover this command */
1255 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1256 io_req->xid);
1257 /*
1258 * Cleanup firmware residuals before returning control back
1259 * to SCSI ML.
1260 */
1261 rc = bnx2fc_abts_cleanup(io_req);
1262 goto done;
1263 } else {
1264 /*
1265 * We come here even when there was a race condition
1266 * between timeout and abts completion, and abts
1267 * completion happens just in time.
1268 */
1269 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1270 rc = SUCCESS;
1271 bnx2fc_scsi_done(io_req, DID_ABORT);
1272 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1273 }
1274 done:
1275 /* release the reference taken in eh_abort */
1276 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1277 spin_unlock_bh(&tgt->tgt_lock);
1278 return rc;
1279 }
1280
1281 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1282 struct fcoe_task_ctx_entry *task,
1283 u8 rx_state)
1284 {
1285 struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1286 struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1287 u32 offset = cb_arg->offset;
1288 enum fc_rctl r_ctl = cb_arg->r_ctl;
1289 int rc = 0;
1290 struct bnx2fc_rport *tgt = orig_io_req->tgt;
1291
1292 BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1293 "cmd_type = %d\n",
1294 seq_clnp_req->xid, seq_clnp_req->cmd_type);
1295
1296 if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1297 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1298 seq_clnp_req->xid);
1299 goto free_cb_arg;
1300 }
1301
1302 spin_unlock_bh(&tgt->tgt_lock);
1303 rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1304 spin_lock_bh(&tgt->tgt_lock);
1305
1306 if (rc)
1307 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1308 " IO will abort\n");
1309 seq_clnp_req->cb_arg = NULL;
1310 kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1311 free_cb_arg:
1312 kfree(cb_arg);
1313 return;
1314 }
1315
1316 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1317 struct fcoe_task_ctx_entry *task,
1318 u8 num_rq)
1319 {
1320 BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1321 "refcnt = %d, cmd_type = %d\n",
1322 kref_read(&io_req->refcount), io_req->cmd_type);
1323 bnx2fc_scsi_done(io_req, DID_ERROR);
1324 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1325 if (io_req->wait_for_comp)
1326 complete(&io_req->tm_done);
1327 }
1328
1329 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1330 struct fcoe_task_ctx_entry *task,
1331 u8 num_rq)
1332 {
1333 u32 r_ctl;
1334 u32 r_a_tov = FC_DEF_R_A_TOV;
1335 u8 issue_rrq = 0;
1336 struct bnx2fc_rport *tgt = io_req->tgt;
1337
1338 BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1339 "refcnt = %d, cmd_type = %d\n",
1340 io_req->xid,
1341 kref_read(&io_req->refcount), io_req->cmd_type);
1342
1343 if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1344 &io_req->req_flags)) {
1345 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1346 " this io\n");
1347 return;
1348 }
1349
1350 /* Do not issue RRQ as this IO is already cleanedup */
1351 if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1352 &io_req->req_flags))
1353 goto io_compl;
1354
1355 /*
1356 * For ABTS issued due to SCSI eh_abort_handler, timeout
1357 * values are maintained by scsi-ml itself. Cancel timeout
1358 * in case ABTS issued as part of task management function
1359 * or due to FW error.
1360 */
1361 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1362 if (cancel_delayed_work(&io_req->timeout_work))
1363 kref_put(&io_req->refcount,
1364 bnx2fc_cmd_release); /* drop timer hold */
1365
1366 r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1367
1368 switch (r_ctl) {
1369 case FC_RCTL_BA_ACC:
1370 /*
1371 * Dont release this cmd yet. It will be relesed
1372 * after we get RRQ response
1373 */
1374 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1375 issue_rrq = 1;
1376 break;
1377
1378 case FC_RCTL_BA_RJT:
1379 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1380 break;
1381 default:
1382 printk(KERN_ERR PFX "Unknown ABTS response\n");
1383 break;
1384 }
1385
1386 if (issue_rrq) {
1387 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1388 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1389 }
1390 set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1391 bnx2fc_cmd_timer_set(io_req, r_a_tov);
1392
1393 io_compl:
1394 if (io_req->wait_for_comp) {
1395 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1396 &io_req->req_flags))
1397 complete(&io_req->tm_done);
1398 } else {
1399 /*
1400 * We end up here when ABTS is issued as
1401 * in asynchronous context, i.e., as part
1402 * of task management completion, or
1403 * when FW error is received or when the
1404 * ABTS is issued when the IO is timed
1405 * out.
1406 */
1407
1408 if (io_req->on_active_queue) {
1409 list_del_init(&io_req->link);
1410 io_req->on_active_queue = 0;
1411 /* Move IO req to retire queue */
1412 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1413 }
1414 bnx2fc_scsi_done(io_req, DID_ERROR);
1415 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1416 }
1417 }
1418
1419 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1420 {
1421 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1422 struct bnx2fc_rport *tgt = io_req->tgt;
1423 struct bnx2fc_cmd *cmd, *tmp;
1424 u64 tm_lun = sc_cmd->device->lun;
1425 u64 lun;
1426 int rc = 0;
1427
1428 /* called with tgt_lock held */
1429 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1430 /*
1431 * Walk thru the active_ios queue and ABORT the IO
1432 * that matches with the LUN that was reset
1433 */
1434 list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1435 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1436 lun = cmd->sc_cmd->device->lun;
1437 if (lun == tm_lun) {
1438 /* Initiate ABTS on this cmd */
1439 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1440 &cmd->req_flags)) {
1441 /* cancel the IO timeout */
1442 if (cancel_delayed_work(&io_req->timeout_work))
1443 kref_put(&io_req->refcount,
1444 bnx2fc_cmd_release);
1445 /* timer hold */
1446 rc = bnx2fc_initiate_abts(cmd);
1447 /* abts shouldn't fail in this context */
1448 WARN_ON(rc != SUCCESS);
1449 } else
1450 printk(KERN_ERR PFX "lun_rst: abts already in"
1451 " progress for this IO 0x%x\n",
1452 cmd->xid);
1453 }
1454 }
1455 }
1456
1457 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1458 {
1459 struct bnx2fc_rport *tgt = io_req->tgt;
1460 struct bnx2fc_cmd *cmd, *tmp;
1461 int rc = 0;
1462
1463 /* called with tgt_lock held */
1464 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1465 /*
1466 * Walk thru the active_ios queue and ABORT the IO
1467 * that matches with the LUN that was reset
1468 */
1469 list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1470 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1471 /* Initiate ABTS */
1472 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1473 &cmd->req_flags)) {
1474 /* cancel the IO timeout */
1475 if (cancel_delayed_work(&io_req->timeout_work))
1476 kref_put(&io_req->refcount,
1477 bnx2fc_cmd_release); /* timer hold */
1478 rc = bnx2fc_initiate_abts(cmd);
1479 /* abts shouldn't fail in this context */
1480 WARN_ON(rc != SUCCESS);
1481
1482 } else
1483 printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1484 " for this IO 0x%x\n", cmd->xid);
1485 }
1486 }
1487
1488 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1489 struct fcoe_task_ctx_entry *task, u8 num_rq)
1490 {
1491 struct bnx2fc_mp_req *tm_req;
1492 struct fc_frame_header *fc_hdr;
1493 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1494 u64 *hdr;
1495 u64 *temp_hdr;
1496 void *rsp_buf;
1497
1498 /* Called with tgt_lock held */
1499 BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1500
1501 if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1502 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1503 else {
1504 /* TM has already timed out and we got
1505 * delayed completion. Ignore completion
1506 * processing.
1507 */
1508 return;
1509 }
1510
1511 tm_req = &(io_req->mp_req);
1512 fc_hdr = &(tm_req->resp_fc_hdr);
1513 hdr = (u64 *)fc_hdr;
1514 temp_hdr = (u64 *)
1515 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1516 hdr[0] = cpu_to_be64(temp_hdr[0]);
1517 hdr[1] = cpu_to_be64(temp_hdr[1]);
1518 hdr[2] = cpu_to_be64(temp_hdr[2]);
1519
1520 tm_req->resp_len =
1521 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1522
1523 rsp_buf = tm_req->resp_buf;
1524
1525 if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1526 bnx2fc_parse_fcp_rsp(io_req,
1527 (struct fcoe_fcp_rsp_payload *)
1528 rsp_buf, num_rq);
1529 if (io_req->fcp_rsp_code == 0) {
1530 /* TM successful */
1531 if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1532 bnx2fc_lun_reset_cmpl(io_req);
1533 else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1534 bnx2fc_tgt_reset_cmpl(io_req);
1535 }
1536 } else {
1537 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1538 fc_hdr->fh_r_ctl);
1539 }
1540 if (!sc_cmd->SCp.ptr) {
1541 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1542 return;
1543 }
1544 switch (io_req->fcp_status) {
1545 case FC_GOOD:
1546 if (io_req->cdb_status == 0) {
1547 /* Good IO completion */
1548 sc_cmd->result = DID_OK << 16;
1549 } else {
1550 /* Transport status is good, SCSI status not good */
1551 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1552 }
1553 if (io_req->fcp_resid)
1554 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1555 break;
1556
1557 default:
1558 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1559 io_req->fcp_status);
1560 break;
1561 }
1562
1563 sc_cmd = io_req->sc_cmd;
1564 io_req->sc_cmd = NULL;
1565
1566 /* check if the io_req exists in tgt's tmf_q */
1567 if (io_req->on_tmf_queue) {
1568
1569 list_del_init(&io_req->link);
1570 io_req->on_tmf_queue = 0;
1571 } else {
1572
1573 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1574 return;
1575 }
1576
1577 sc_cmd->SCp.ptr = NULL;
1578 sc_cmd->scsi_done(sc_cmd);
1579
1580 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1581 if (io_req->wait_for_comp) {
1582 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1583 complete(&io_req->tm_done);
1584 }
1585 }
1586
1587 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1588 int bd_index)
1589 {
1590 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1591 int frag_size, sg_frags;
1592
1593 sg_frags = 0;
1594 while (sg_len) {
1595 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1596 frag_size = BNX2FC_BD_SPLIT_SZ;
1597 else
1598 frag_size = sg_len;
1599 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1600 bd[bd_index + sg_frags].buf_addr_hi = addr >> 32;
1601 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1602 bd[bd_index + sg_frags].flags = 0;
1603
1604 addr += (u64) frag_size;
1605 sg_frags++;
1606 sg_len -= frag_size;
1607 }
1608 return sg_frags;
1609
1610 }
1611
1612 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1613 {
1614 struct bnx2fc_interface *interface = io_req->port->priv;
1615 struct bnx2fc_hba *hba = interface->hba;
1616 struct scsi_cmnd *sc = io_req->sc_cmd;
1617 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1618 struct scatterlist *sg;
1619 int byte_count = 0;
1620 int sg_count = 0;
1621 int bd_count = 0;
1622 int sg_frags;
1623 unsigned int sg_len;
1624 u64 addr;
1625 int i;
1626
1627 /*
1628 * Use dma_map_sg directly to ensure we're using the correct
1629 * dev struct off of pcidev.
1630 */
1631 sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1632 scsi_sg_count(sc), sc->sc_data_direction);
1633 scsi_for_each_sg(sc, sg, sg_count, i) {
1634 sg_len = sg_dma_len(sg);
1635 addr = sg_dma_address(sg);
1636 if (sg_len > BNX2FC_MAX_BD_LEN) {
1637 sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1638 bd_count);
1639 } else {
1640
1641 sg_frags = 1;
1642 bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1643 bd[bd_count].buf_addr_hi = addr >> 32;
1644 bd[bd_count].buf_len = (u16)sg_len;
1645 bd[bd_count].flags = 0;
1646 }
1647 bd_count += sg_frags;
1648 byte_count += sg_len;
1649 }
1650 if (byte_count != scsi_bufflen(sc))
1651 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1652 "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1653 io_req->xid);
1654 return bd_count;
1655 }
1656
1657 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1658 {
1659 struct scsi_cmnd *sc = io_req->sc_cmd;
1660 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1661 int bd_count;
1662
1663 if (scsi_sg_count(sc)) {
1664 bd_count = bnx2fc_map_sg(io_req);
1665 if (bd_count == 0)
1666 return -ENOMEM;
1667 } else {
1668 bd_count = 0;
1669 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1670 bd[0].buf_len = bd[0].flags = 0;
1671 }
1672 io_req->bd_tbl->bd_valid = bd_count;
1673
1674 return 0;
1675 }
1676
1677 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1678 {
1679 struct scsi_cmnd *sc = io_req->sc_cmd;
1680 struct bnx2fc_interface *interface = io_req->port->priv;
1681 struct bnx2fc_hba *hba = interface->hba;
1682
1683 /*
1684 * Use dma_unmap_sg directly to ensure we're using the correct
1685 * dev struct off of pcidev.
1686 */
1687 if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1688 dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
1689 scsi_sg_count(sc), sc->sc_data_direction);
1690 io_req->bd_tbl->bd_valid = 0;
1691 }
1692 }
1693
1694 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1695 struct fcp_cmnd *fcp_cmnd)
1696 {
1697 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1698
1699 memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1700
1701 int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1702
1703 fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1704 memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1705
1706 fcp_cmnd->fc_cmdref = 0;
1707 fcp_cmnd->fc_pri_ta = 0;
1708 fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1709 fcp_cmnd->fc_flags = io_req->io_req_flags;
1710 fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1711 }
1712
1713 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1714 struct fcoe_fcp_rsp_payload *fcp_rsp,
1715 u8 num_rq)
1716 {
1717 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1718 struct bnx2fc_rport *tgt = io_req->tgt;
1719 u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1720 u32 rq_buff_len = 0;
1721 int i;
1722 unsigned char *rq_data;
1723 unsigned char *dummy;
1724 int fcp_sns_len = 0;
1725 int fcp_rsp_len = 0;
1726
1727 io_req->fcp_status = FC_GOOD;
1728 io_req->fcp_resid = 0;
1729 if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1730 FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1731 io_req->fcp_resid = fcp_rsp->fcp_resid;
1732
1733 io_req->scsi_comp_flags = rsp_flags;
1734 CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1735 fcp_rsp->scsi_status_code;
1736
1737 /* Fetch fcp_rsp_info and fcp_sns_info if available */
1738 if (num_rq) {
1739
1740 /*
1741 * We do not anticipate num_rq >1, as the linux defined
1742 * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1743 * 256 bytes of single rq buffer is good enough to hold this.
1744 */
1745
1746 if (rsp_flags &
1747 FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1748 fcp_rsp_len = rq_buff_len
1749 = fcp_rsp->fcp_rsp_len;
1750 }
1751
1752 if (rsp_flags &
1753 FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1754 fcp_sns_len = fcp_rsp->fcp_sns_len;
1755 rq_buff_len += fcp_rsp->fcp_sns_len;
1756 }
1757
1758 io_req->fcp_rsp_len = fcp_rsp_len;
1759 io_req->fcp_sns_len = fcp_sns_len;
1760
1761 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1762 /* Invalid sense sense length. */
1763 printk(KERN_ERR PFX "invalid sns length %d\n",
1764 rq_buff_len);
1765 /* reset rq_buff_len */
1766 rq_buff_len = num_rq * BNX2FC_RQ_BUF_SZ;
1767 }
1768
1769 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1770
1771 if (num_rq > 1) {
1772 /* We do not need extra sense data */
1773 for (i = 1; i < num_rq; i++)
1774 dummy = bnx2fc_get_next_rqe(tgt, 1);
1775 }
1776
1777 /* fetch fcp_rsp_code */
1778 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1779 /* Only for task management function */
1780 io_req->fcp_rsp_code = rq_data[3];
1781 BNX2FC_IO_DBG(io_req, "fcp_rsp_code = %d\n",
1782 io_req->fcp_rsp_code);
1783 }
1784
1785 /* fetch sense data */
1786 rq_data += fcp_rsp_len;
1787
1788 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1789 printk(KERN_ERR PFX "Truncating sense buffer\n");
1790 fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1791 }
1792
1793 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1794 if (fcp_sns_len)
1795 memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1796
1797 /* return RQ entries */
1798 for (i = 0; i < num_rq; i++)
1799 bnx2fc_return_rqe(tgt, 1);
1800 }
1801 }
1802
1803 /**
1804 * bnx2fc_queuecommand - Queuecommand function of the scsi template
1805 *
1806 * @host: The Scsi_Host the command was issued to
1807 * @sc_cmd: struct scsi_cmnd to be executed
1808 *
1809 * This is the IO strategy routine, called by SCSI-ML
1810 **/
1811 int bnx2fc_queuecommand(struct Scsi_Host *host,
1812 struct scsi_cmnd *sc_cmd)
1813 {
1814 struct fc_lport *lport = shost_priv(host);
1815 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1816 struct fc_rport_libfc_priv *rp = rport->dd_data;
1817 struct bnx2fc_rport *tgt;
1818 struct bnx2fc_cmd *io_req;
1819 int rc = 0;
1820 int rval;
1821
1822 rval = fc_remote_port_chkready(rport);
1823 if (rval) {
1824 sc_cmd->result = rval;
1825 sc_cmd->scsi_done(sc_cmd);
1826 return 0;
1827 }
1828
1829 if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1830 rc = SCSI_MLQUEUE_HOST_BUSY;
1831 goto exit_qcmd;
1832 }
1833
1834 /* rport and tgt are allocated together, so tgt should be non-NULL */
1835 tgt = (struct bnx2fc_rport *)&rp[1];
1836
1837 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1838 /*
1839 * Session is not offloaded yet. Let SCSI-ml retry
1840 * the command.
1841 */
1842 rc = SCSI_MLQUEUE_TARGET_BUSY;
1843 goto exit_qcmd;
1844 }
1845 if (tgt->retry_delay_timestamp) {
1846 if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1847 tgt->retry_delay_timestamp = 0;
1848 } else {
1849 /* If retry_delay timer is active, flow off the ML */
1850 rc = SCSI_MLQUEUE_TARGET_BUSY;
1851 goto exit_qcmd;
1852 }
1853 }
1854
1855 spin_lock_bh(&tgt->tgt_lock);
1856
1857 io_req = bnx2fc_cmd_alloc(tgt);
1858 if (!io_req) {
1859 rc = SCSI_MLQUEUE_HOST_BUSY;
1860 goto exit_qcmd_tgtlock;
1861 }
1862 io_req->sc_cmd = sc_cmd;
1863
1864 if (bnx2fc_post_io_req(tgt, io_req)) {
1865 printk(KERN_ERR PFX "Unable to post io_req\n");
1866 rc = SCSI_MLQUEUE_HOST_BUSY;
1867 goto exit_qcmd_tgtlock;
1868 }
1869
1870 exit_qcmd_tgtlock:
1871 spin_unlock_bh(&tgt->tgt_lock);
1872 exit_qcmd:
1873 return rc;
1874 }
1875
1876 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1877 struct fcoe_task_ctx_entry *task,
1878 u8 num_rq)
1879 {
1880 struct fcoe_fcp_rsp_payload *fcp_rsp;
1881 struct bnx2fc_rport *tgt = io_req->tgt;
1882 struct scsi_cmnd *sc_cmd;
1883 struct Scsi_Host *host;
1884
1885
1886 /* scsi_cmd_cmpl is called with tgt lock held */
1887
1888 if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1889 /* we will not receive ABTS response for this IO */
1890 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1891 "this scsi cmd\n");
1892 return;
1893 }
1894
1895 /* Cancel the timeout_work, as we received IO completion */
1896 if (cancel_delayed_work(&io_req->timeout_work))
1897 kref_put(&io_req->refcount,
1898 bnx2fc_cmd_release); /* drop timer hold */
1899
1900 sc_cmd = io_req->sc_cmd;
1901 if (sc_cmd == NULL) {
1902 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1903 return;
1904 }
1905
1906 /* Fetch fcp_rsp from task context and perform cmd completion */
1907 fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1908 &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1909
1910 /* parse fcp_rsp and obtain sense data from RQ if available */
1911 bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1912
1913 host = sc_cmd->device->host;
1914 if (!sc_cmd->SCp.ptr) {
1915 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1916 return;
1917 }
1918
1919 if (io_req->on_active_queue) {
1920 list_del_init(&io_req->link);
1921 io_req->on_active_queue = 0;
1922 /* Move IO req to retire queue */
1923 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1924 } else {
1925 /* This should not happen, but could have been pulled
1926 * by bnx2fc_flush_active_ios(), or during a race
1927 * between command abort and (late) completion.
1928 */
1929 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1930 if (io_req->wait_for_comp)
1931 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1932 &io_req->req_flags))
1933 complete(&io_req->tm_done);
1934 }
1935
1936 bnx2fc_unmap_sg_list(io_req);
1937 io_req->sc_cmd = NULL;
1938
1939 switch (io_req->fcp_status) {
1940 case FC_GOOD:
1941 if (io_req->cdb_status == 0) {
1942 /* Good IO completion */
1943 sc_cmd->result = DID_OK << 16;
1944 } else {
1945 /* Transport status is good, SCSI status not good */
1946 BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1947 " fcp_resid = 0x%x\n",
1948 io_req->cdb_status, io_req->fcp_resid);
1949 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1950
1951 if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1952 io_req->cdb_status == SAM_STAT_BUSY) {
1953 /* Set the jiffies + retry_delay_timer * 100ms
1954 for the rport/tgt */
1955 tgt->retry_delay_timestamp = jiffies +
1956 fcp_rsp->retry_delay_timer * HZ / 10;
1957 }
1958
1959 }
1960 if (io_req->fcp_resid)
1961 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1962 break;
1963 default:
1964 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1965 io_req->fcp_status);
1966 break;
1967 }
1968 sc_cmd->SCp.ptr = NULL;
1969 sc_cmd->scsi_done(sc_cmd);
1970 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1971 }
1972
1973 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1974 struct bnx2fc_cmd *io_req)
1975 {
1976 struct fcoe_task_ctx_entry *task;
1977 struct fcoe_task_ctx_entry *task_page;
1978 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1979 struct fcoe_port *port = tgt->port;
1980 struct bnx2fc_interface *interface = port->priv;
1981 struct bnx2fc_hba *hba = interface->hba;
1982 struct fc_lport *lport = port->lport;
1983 struct fc_stats *stats;
1984 int task_idx, index;
1985 u16 xid;
1986
1987 /* bnx2fc_post_io_req() is called with the tgt_lock held */
1988
1989 /* Initialize rest of io_req fields */
1990 io_req->cmd_type = BNX2FC_SCSI_CMD;
1991 io_req->port = port;
1992 io_req->tgt = tgt;
1993 io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1994 sc_cmd->SCp.ptr = (char *)io_req;
1995
1996 stats = per_cpu_ptr(lport->stats, get_cpu());
1997 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1998 io_req->io_req_flags = BNX2FC_READ;
1999 stats->InputRequests++;
2000 stats->InputBytes += io_req->data_xfer_len;
2001 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2002 io_req->io_req_flags = BNX2FC_WRITE;
2003 stats->OutputRequests++;
2004 stats->OutputBytes += io_req->data_xfer_len;
2005 } else {
2006 io_req->io_req_flags = 0;
2007 stats->ControlRequests++;
2008 }
2009 put_cpu();
2010
2011 xid = io_req->xid;
2012
2013 /* Build buffer descriptor list for firmware from sg list */
2014 if (bnx2fc_build_bd_list_from_sg(io_req)) {
2015 printk(KERN_ERR PFX "BD list creation failed\n");
2016 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2017 return -EAGAIN;
2018 }
2019
2020 task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2021 index = xid % BNX2FC_TASKS_PER_PAGE;
2022
2023 /* Initialize task context for this IO request */
2024 task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2025 task = &(task_page[index]);
2026 bnx2fc_init_task(io_req, task);
2027
2028 if (tgt->flush_in_prog) {
2029 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2030 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2031 return -EAGAIN;
2032 }
2033
2034 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2035 printk(KERN_ERR PFX "Session not ready...post_io\n");
2036 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2037 return -EAGAIN;
2038 }
2039
2040 /* Time IO req */
2041 if (tgt->io_timeout)
2042 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2043 /* Obtain free SQ entry */
2044 bnx2fc_add_2_sq(tgt, xid);
2045
2046 /* Enqueue the io_req to active_cmd_queue */
2047
2048 io_req->on_active_queue = 1;
2049 /* move io_req from pending_queue to active_queue */
2050 list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2051
2052 /* Ring doorbell */
2053 bnx2fc_ring_doorbell(tgt);
2054 return 0;
2055 }
Linux with added FPC-III support