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
bnx2fc_cmd_timer_set(struct bnx2fc_cmd * io_req,unsigned int timer_msec)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
bnx2fc_cmd_timeout(struct work_struct * work)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
bnx2fc_scsi_done(struct bnx2fc_cmd * io_req,int err_code)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
bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba * hba)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
bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr * cmgr)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
bnx2fc_elstm_alloc(struct bnx2fc_rport * tgt,int type)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
bnx2fc_cmd_alloc(struct bnx2fc_rport * tgt)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
bnx2fc_cmd_release(struct kref * ref)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
bnx2fc_free_mp_resc(struct bnx2fc_cmd * io_req)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
bnx2fc_init_mp_req(struct bnx2fc_cmd * io_req)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
bnx2fc_initiate_tmf(struct scsi_cmnd * sc_cmd,u8 tm_flags)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->abts_done);
779 io_req->wait_for_abts_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->abts_done,
786 interface->tm_timeout * HZ);
787 spin_lock_bh(&tgt->tgt_lock);
788
789 io_req->wait_for_abts_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_cleanup_comp = 1;
797 init_completion(&io_req->cleanup_done);
798 bnx2fc_initiate_cleanup(io_req);
799 spin_unlock_bh(&tgt->tgt_lock);
800 rc = wait_for_completion_timeout(&io_req->cleanup_done,
801 BNX2FC_FW_TIMEOUT);
802 spin_lock_bh(&tgt->tgt_lock);
803 io_req->wait_for_cleanup_comp = 0;
804 if (!rc)
805 kref_put(&io_req->refcount, bnx2fc_cmd_release);
806 }
807
808 spin_unlock_bh(&tgt->tgt_lock);
809
810 if (!rc) {
811 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
812 rc = FAILED;
813 } else {
814 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
815 rc = SUCCESS;
816 }
817 tmf_err:
818 return rc;
819 }
820
bnx2fc_initiate_abts(struct bnx2fc_cmd * io_req)821 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
822 {
823 struct fc_lport *lport;
824 struct bnx2fc_rport *tgt = io_req->tgt;
825 struct fc_rport *rport = tgt->rport;
826 struct fc_rport_priv *rdata = tgt->rdata;
827 struct bnx2fc_interface *interface;
828 struct fcoe_port *port;
829 struct bnx2fc_cmd *abts_io_req;
830 struct fcoe_task_ctx_entry *task;
831 struct fcoe_task_ctx_entry *task_page;
832 struct fc_frame_header *fc_hdr;
833 struct bnx2fc_mp_req *abts_req;
834 int task_idx, index;
835 u32 sid, did;
836 u16 xid;
837 int rc = SUCCESS;
838 u32 r_a_tov = rdata->r_a_tov;
839
840 /* called with tgt_lock held */
841 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
842
843 port = io_req->port;
844 interface = port->priv;
845 lport = port->lport;
846
847 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
848 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
849 rc = FAILED;
850 goto abts_err;
851 }
852
853 if (rport == NULL) {
854 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
855 rc = FAILED;
856 goto abts_err;
857 }
858
859 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
860 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
861 rc = FAILED;
862 goto abts_err;
863 }
864
865 abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
866 if (!abts_io_req) {
867 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
868 rc = FAILED;
869 goto abts_err;
870 }
871
872 /* Initialize rest of io_req fields */
873 abts_io_req->sc_cmd = NULL;
874 abts_io_req->port = port;
875 abts_io_req->tgt = tgt;
876 abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
877
878 abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
879 memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
880
881 /* Fill FC header */
882 fc_hdr = &(abts_req->req_fc_hdr);
883
884 /* Obtain oxid and rxid for the original exchange to be aborted */
885 fc_hdr->fh_ox_id = htons(io_req->xid);
886 fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
887
888 sid = tgt->sid;
889 did = rport->port_id;
890
891 __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
892 FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
893 FC_FC_SEQ_INIT, 0);
894
895 xid = abts_io_req->xid;
896 BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
897 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
898 index = xid % BNX2FC_TASKS_PER_PAGE;
899
900 /* Initialize task context for this IO request */
901 task_page = (struct fcoe_task_ctx_entry *)
902 interface->hba->task_ctx[task_idx];
903 task = &(task_page[index]);
904 bnx2fc_init_mp_task(abts_io_req, task);
905
906 /*
907 * ABTS task is a temporary task that will be cleaned up
908 * irrespective of ABTS response. We need to start the timer
909 * for the original exchange, as the CQE is posted for the original
910 * IO request.
911 *
912 * Timer for ABTS is started only when it is originated by a
913 * TM request. For the ABTS issued as part of ULP timeout,
914 * scsi-ml maintains the timers.
915 */
916
917 /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
918 bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
919
920 /* Obtain free SQ entry */
921 bnx2fc_add_2_sq(tgt, xid);
922
923 /* Ring doorbell */
924 bnx2fc_ring_doorbell(tgt);
925
926 abts_err:
927 return rc;
928 }
929
bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd * orig_io_req,u32 offset,enum fc_rctl r_ctl)930 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
931 enum fc_rctl r_ctl)
932 {
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
951 cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
952 if (!cb_arg) {
953 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
954 rc = -ENOMEM;
955 goto cleanup_err;
956 }
957
958 seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
959 if (!seq_clnp_req) {
960 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
961 rc = -ENOMEM;
962 kfree(cb_arg);
963 goto cleanup_err;
964 }
965 /* Initialize rest of io_req fields */
966 seq_clnp_req->sc_cmd = NULL;
967 seq_clnp_req->port = port;
968 seq_clnp_req->tgt = tgt;
969 seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
970
971 xid = seq_clnp_req->xid;
972
973 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
974 index = xid % BNX2FC_TASKS_PER_PAGE;
975
976 /* Initialize task context for this IO request */
977 task_page = (struct fcoe_task_ctx_entry *)
978 interface->hba->task_ctx[task_idx];
979 task = &(task_page[index]);
980 cb_arg->aborted_io_req = orig_io_req;
981 cb_arg->io_req = seq_clnp_req;
982 cb_arg->r_ctl = r_ctl;
983 cb_arg->offset = offset;
984 seq_clnp_req->cb_arg = cb_arg;
985
986 printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
987 bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
988
989 /* Obtain free SQ entry */
990 bnx2fc_add_2_sq(tgt, xid);
991
992 /* Ring doorbell */
993 bnx2fc_ring_doorbell(tgt);
994 cleanup_err:
995 return rc;
996 }
997
bnx2fc_initiate_cleanup(struct bnx2fc_cmd * io_req)998 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
999 {
1000 struct bnx2fc_rport *tgt = io_req->tgt;
1001 struct bnx2fc_interface *interface;
1002 struct fcoe_port *port;
1003 struct bnx2fc_cmd *cleanup_io_req;
1004 struct fcoe_task_ctx_entry *task;
1005 struct fcoe_task_ctx_entry *task_page;
1006 int task_idx, index;
1007 u16 xid, orig_xid;
1008 int rc = 0;
1009
1010 /* ASSUMPTION: called with tgt_lock held */
1011 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1012
1013 port = io_req->port;
1014 interface = port->priv;
1015
1016 cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1017 if (!cleanup_io_req) {
1018 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1019 rc = -1;
1020 goto cleanup_err;
1021 }
1022
1023 /* Initialize rest of io_req fields */
1024 cleanup_io_req->sc_cmd = NULL;
1025 cleanup_io_req->port = port;
1026 cleanup_io_req->tgt = tgt;
1027 cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1028
1029 xid = cleanup_io_req->xid;
1030
1031 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1032 index = xid % BNX2FC_TASKS_PER_PAGE;
1033
1034 /* Initialize task context for this IO request */
1035 task_page = (struct fcoe_task_ctx_entry *)
1036 interface->hba->task_ctx[task_idx];
1037 task = &(task_page[index]);
1038 orig_xid = io_req->xid;
1039
1040 BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1041
1042 bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1043
1044 /* Obtain free SQ entry */
1045 bnx2fc_add_2_sq(tgt, xid);
1046
1047 /* Set flag that cleanup request is pending with the firmware */
1048 set_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
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 */
bnx2fc_eh_target_reset(struct scsi_cmnd * sc_cmd)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 */
bnx2fc_eh_device_reset(struct scsi_cmnd * sc_cmd)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
bnx2fc_abts_cleanup(struct bnx2fc_cmd * io_req)1083 static int bnx2fc_abts_cleanup(struct bnx2fc_cmd *io_req)
1084 {
1085 struct bnx2fc_rport *tgt = io_req->tgt;
1086 unsigned int time_left;
1087
1088 init_completion(&io_req->cleanup_done);
1089 io_req->wait_for_cleanup_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->cleanup_done,
1099 BNX2FC_FW_TIMEOUT);
1100 if (!time_left) {
1101 BNX2FC_IO_DBG(io_req, "%s(): Wait for cleanup timed out.\n",
1102 __func__);
1103
1104 /*
1105 * Put the extra reference to the SCSI command since it would
1106 * not have been returned in this case.
1107 */
1108 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1109 }
1110
1111 spin_lock_bh(&tgt->tgt_lock);
1112 io_req->wait_for_cleanup_comp = 0;
1113 return SUCCESS;
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 */
bnx2fc_eh_abort(struct scsi_cmnd * sc_cmd)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->abts_done);
1202 init_completion(&io_req->cleanup_done);
1203
1204 if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1205 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1206 "already in abts processing\n", io_req->xid);
1207 if (cancel_delayed_work(&io_req->timeout_work))
1208 kref_put(&io_req->refcount,
1209 bnx2fc_cmd_release); /* drop timer hold */
1210 /*
1211 * We don't want to hold off the upper layer timer so simply
1212 * cleanup the command and return that I/O was successfully
1213 * aborted.
1214 */
1215 rc = bnx2fc_abts_cleanup(io_req);
1216 /* This only occurs when an task abort was requested while ABTS
1217 is in progress. Setting the IO_CLEANUP flag will skip the
1218 RRQ process in the case when the fw generated SCSI_CMD cmpl
1219 was a result from the ABTS request rather than the CLEANUP
1220 request */
1221 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1222 goto done;
1223 }
1224
1225 /* Cancel the current timer running on this io_req */
1226 if (cancel_delayed_work(&io_req->timeout_work))
1227 kref_put(&io_req->refcount,
1228 bnx2fc_cmd_release); /* drop timer hold */
1229 set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1230 io_req->wait_for_abts_comp = 1;
1231 rc = bnx2fc_initiate_abts(io_req);
1232 if (rc == FAILED) {
1233 io_req->wait_for_cleanup_comp = 1;
1234 bnx2fc_initiate_cleanup(io_req);
1235 spin_unlock_bh(&tgt->tgt_lock);
1236 wait_for_completion(&io_req->cleanup_done);
1237 spin_lock_bh(&tgt->tgt_lock);
1238 io_req->wait_for_cleanup_comp = 0;
1239 goto done;
1240 }
1241 spin_unlock_bh(&tgt->tgt_lock);
1242
1243 /* Wait 2 * RA_TOV + 1 to be sure timeout function hasn't fired */
1244 time_left = wait_for_completion_timeout(&io_req->abts_done,
1245 (2 * rp->r_a_tov + 1) * HZ);
1246 if (time_left)
1247 BNX2FC_IO_DBG(io_req,
1248 "Timed out in eh_abort waiting for abts_done");
1249
1250 spin_lock_bh(&tgt->tgt_lock);
1251 io_req->wait_for_abts_comp = 0;
1252 if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1253 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1254 rc = SUCCESS;
1255 } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1256 &io_req->req_flags))) {
1257 /* Let the scsi-ml try to recover this command */
1258 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1259 io_req->xid);
1260 /*
1261 * Cleanup firmware residuals before returning control back
1262 * to SCSI ML.
1263 */
1264 rc = bnx2fc_abts_cleanup(io_req);
1265 goto done;
1266 } else {
1267 /*
1268 * We come here even when there was a race condition
1269 * between timeout and abts completion, and abts
1270 * completion happens just in time.
1271 */
1272 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1273 rc = SUCCESS;
1274 bnx2fc_scsi_done(io_req, DID_ABORT);
1275 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1276 }
1277 done:
1278 /* release the reference taken in eh_abort */
1279 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1280 spin_unlock_bh(&tgt->tgt_lock);
1281 return rc;
1282 }
1283
bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd * seq_clnp_req,struct fcoe_task_ctx_entry * task,u8 rx_state)1284 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1285 struct fcoe_task_ctx_entry *task,
1286 u8 rx_state)
1287 {
1288 struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1289 struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1290 u32 offset = cb_arg->offset;
1291 enum fc_rctl r_ctl = cb_arg->r_ctl;
1292 int rc = 0;
1293 struct bnx2fc_rport *tgt = orig_io_req->tgt;
1294
1295 BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1296 "cmd_type = %d\n",
1297 seq_clnp_req->xid, seq_clnp_req->cmd_type);
1298
1299 if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1300 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1301 seq_clnp_req->xid);
1302 goto free_cb_arg;
1303 }
1304
1305 spin_unlock_bh(&tgt->tgt_lock);
1306 rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1307 spin_lock_bh(&tgt->tgt_lock);
1308
1309 if (rc)
1310 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1311 " IO will abort\n");
1312 seq_clnp_req->cb_arg = NULL;
1313 kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1314 free_cb_arg:
1315 kfree(cb_arg);
1316 return;
1317 }
1318
bnx2fc_process_cleanup_compl(struct bnx2fc_cmd * io_req,struct fcoe_task_ctx_entry * task,u8 num_rq)1319 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1320 struct fcoe_task_ctx_entry *task,
1321 u8 num_rq)
1322 {
1323 BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1324 "refcnt = %d, cmd_type = %d\n",
1325 kref_read(&io_req->refcount), io_req->cmd_type);
1326 /*
1327 * Test whether there is a cleanup request pending. If not just
1328 * exit.
1329 */
1330 if (!test_and_clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ,
1331 &io_req->req_flags))
1332 return;
1333 /*
1334 * If we receive a cleanup completion for this request then the
1335 * firmware will not give us an abort completion for this request
1336 * so clear any ABTS pending flags.
1337 */
1338 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags) &&
1339 !test_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags)) {
1340 set_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags);
1341 if (io_req->wait_for_abts_comp)
1342 complete(&io_req->abts_done);
1343 }
1344
1345 bnx2fc_scsi_done(io_req, DID_ERROR);
1346 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1347 if (io_req->wait_for_cleanup_comp)
1348 complete(&io_req->cleanup_done);
1349 }
1350
bnx2fc_process_abts_compl(struct bnx2fc_cmd * io_req,struct fcoe_task_ctx_entry * task,u8 num_rq)1351 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1352 struct fcoe_task_ctx_entry *task,
1353 u8 num_rq)
1354 {
1355 u32 r_ctl;
1356 u32 r_a_tov = FC_DEF_R_A_TOV;
1357 u8 issue_rrq = 0;
1358 struct bnx2fc_rport *tgt = io_req->tgt;
1359
1360 BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1361 "refcnt = %d, cmd_type = %d\n",
1362 io_req->xid,
1363 kref_read(&io_req->refcount), io_req->cmd_type);
1364
1365 if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1366 &io_req->req_flags)) {
1367 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1368 " this io\n");
1369 return;
1370 }
1371
1372 /*
1373 * If we receive an ABTS completion here then we will not receive
1374 * a cleanup completion so clear any cleanup pending flags.
1375 */
1376 if (test_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags)) {
1377 clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
1378 if (io_req->wait_for_cleanup_comp)
1379 complete(&io_req->cleanup_done);
1380 }
1381
1382 /* Do not issue RRQ as this IO is already cleanedup */
1383 if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1384 &io_req->req_flags))
1385 goto io_compl;
1386
1387 /*
1388 * For ABTS issued due to SCSI eh_abort_handler, timeout
1389 * values are maintained by scsi-ml itself. Cancel timeout
1390 * in case ABTS issued as part of task management function
1391 * or due to FW error.
1392 */
1393 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1394 if (cancel_delayed_work(&io_req->timeout_work))
1395 kref_put(&io_req->refcount,
1396 bnx2fc_cmd_release); /* drop timer hold */
1397
1398 r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1399
1400 switch (r_ctl) {
1401 case FC_RCTL_BA_ACC:
1402 /*
1403 * Dont release this cmd yet. It will be relesed
1404 * after we get RRQ response
1405 */
1406 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1407 issue_rrq = 1;
1408 break;
1409
1410 case FC_RCTL_BA_RJT:
1411 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1412 break;
1413 default:
1414 printk(KERN_ERR PFX "Unknown ABTS response\n");
1415 break;
1416 }
1417
1418 if (issue_rrq) {
1419 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1420 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1421 }
1422 set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1423 bnx2fc_cmd_timer_set(io_req, r_a_tov);
1424
1425 io_compl:
1426 if (io_req->wait_for_abts_comp) {
1427 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1428 &io_req->req_flags))
1429 complete(&io_req->abts_done);
1430 } else {
1431 /*
1432 * We end up here when ABTS is issued as
1433 * in asynchronous context, i.e., as part
1434 * of task management completion, or
1435 * when FW error is received or when the
1436 * ABTS is issued when the IO is timed
1437 * out.
1438 */
1439
1440 if (io_req->on_active_queue) {
1441 list_del_init(&io_req->link);
1442 io_req->on_active_queue = 0;
1443 /* Move IO req to retire queue */
1444 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1445 }
1446 bnx2fc_scsi_done(io_req, DID_ERROR);
1447 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1448 }
1449 }
1450
bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd * io_req)1451 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1452 {
1453 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1454 struct bnx2fc_rport *tgt = io_req->tgt;
1455 struct bnx2fc_cmd *cmd, *tmp;
1456 u64 tm_lun = sc_cmd->device->lun;
1457 u64 lun;
1458 int rc = 0;
1459
1460 /* called with tgt_lock held */
1461 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1462 /*
1463 * Walk thru the active_ios queue and ABORT the IO
1464 * that matches with the LUN that was reset
1465 */
1466 list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1467 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1468 lun = cmd->sc_cmd->device->lun;
1469 if (lun == tm_lun) {
1470 /* Initiate ABTS on this cmd */
1471 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1472 &cmd->req_flags)) {
1473 /* cancel the IO timeout */
1474 if (cancel_delayed_work(&io_req->timeout_work))
1475 kref_put(&io_req->refcount,
1476 bnx2fc_cmd_release);
1477 /* timer hold */
1478 rc = bnx2fc_initiate_abts(cmd);
1479 /* abts shouldn't fail in this context */
1480 WARN_ON(rc != SUCCESS);
1481 } else
1482 printk(KERN_ERR PFX "lun_rst: abts already in"
1483 " progress for this IO 0x%x\n",
1484 cmd->xid);
1485 }
1486 }
1487 }
1488
bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd * io_req)1489 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1490 {
1491 struct bnx2fc_rport *tgt = io_req->tgt;
1492 struct bnx2fc_cmd *cmd, *tmp;
1493 int rc = 0;
1494
1495 /* called with tgt_lock held */
1496 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1497 /*
1498 * Walk thru the active_ios queue and ABORT the IO
1499 * that matches with the LUN that was reset
1500 */
1501 list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1502 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1503 /* Initiate ABTS */
1504 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1505 &cmd->req_flags)) {
1506 /* cancel the IO timeout */
1507 if (cancel_delayed_work(&io_req->timeout_work))
1508 kref_put(&io_req->refcount,
1509 bnx2fc_cmd_release); /* timer hold */
1510 rc = bnx2fc_initiate_abts(cmd);
1511 /* abts shouldn't fail in this context */
1512 WARN_ON(rc != SUCCESS);
1513
1514 } else
1515 printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1516 " for this IO 0x%x\n", cmd->xid);
1517 }
1518 }
1519
bnx2fc_process_tm_compl(struct bnx2fc_cmd * io_req,struct fcoe_task_ctx_entry * task,u8 num_rq)1520 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1521 struct fcoe_task_ctx_entry *task, u8 num_rq)
1522 {
1523 struct bnx2fc_mp_req *tm_req;
1524 struct fc_frame_header *fc_hdr;
1525 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1526 u64 *hdr;
1527 u64 *temp_hdr;
1528 void *rsp_buf;
1529
1530 /* Called with tgt_lock held */
1531 BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1532
1533 if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1534 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1535 else {
1536 /* TM has already timed out and we got
1537 * delayed completion. Ignore completion
1538 * processing.
1539 */
1540 return;
1541 }
1542
1543 tm_req = &(io_req->mp_req);
1544 fc_hdr = &(tm_req->resp_fc_hdr);
1545 hdr = (u64 *)fc_hdr;
1546 temp_hdr = (u64 *)
1547 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1548 hdr[0] = cpu_to_be64(temp_hdr[0]);
1549 hdr[1] = cpu_to_be64(temp_hdr[1]);
1550 hdr[2] = cpu_to_be64(temp_hdr[2]);
1551
1552 tm_req->resp_len =
1553 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1554
1555 rsp_buf = tm_req->resp_buf;
1556
1557 if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1558 bnx2fc_parse_fcp_rsp(io_req,
1559 (struct fcoe_fcp_rsp_payload *)
1560 rsp_buf, num_rq);
1561 if (io_req->fcp_rsp_code == 0) {
1562 /* TM successful */
1563 if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1564 bnx2fc_lun_reset_cmpl(io_req);
1565 else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1566 bnx2fc_tgt_reset_cmpl(io_req);
1567 }
1568 } else {
1569 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1570 fc_hdr->fh_r_ctl);
1571 }
1572 if (!sc_cmd->SCp.ptr) {
1573 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1574 return;
1575 }
1576 switch (io_req->fcp_status) {
1577 case FC_GOOD:
1578 if (io_req->cdb_status == 0) {
1579 /* Good IO completion */
1580 sc_cmd->result = DID_OK << 16;
1581 } else {
1582 /* Transport status is good, SCSI status not good */
1583 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1584 }
1585 if (io_req->fcp_resid)
1586 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1587 break;
1588
1589 default:
1590 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1591 io_req->fcp_status);
1592 break;
1593 }
1594
1595 sc_cmd = io_req->sc_cmd;
1596 io_req->sc_cmd = NULL;
1597
1598 /* check if the io_req exists in tgt's tmf_q */
1599 if (io_req->on_tmf_queue) {
1600
1601 list_del_init(&io_req->link);
1602 io_req->on_tmf_queue = 0;
1603 } else {
1604
1605 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1606 return;
1607 }
1608
1609 sc_cmd->SCp.ptr = NULL;
1610 sc_cmd->scsi_done(sc_cmd);
1611
1612 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1613 if (io_req->wait_for_abts_comp) {
1614 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1615 complete(&io_req->abts_done);
1616 }
1617 }
1618
bnx2fc_split_bd(struct bnx2fc_cmd * io_req,u64 addr,int sg_len,int bd_index)1619 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1620 int bd_index)
1621 {
1622 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1623 int frag_size, sg_frags;
1624
1625 sg_frags = 0;
1626 while (sg_len) {
1627 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1628 frag_size = BNX2FC_BD_SPLIT_SZ;
1629 else
1630 frag_size = sg_len;
1631 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1632 bd[bd_index + sg_frags].buf_addr_hi = addr >> 32;
1633 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1634 bd[bd_index + sg_frags].flags = 0;
1635
1636 addr += (u64) frag_size;
1637 sg_frags++;
1638 sg_len -= frag_size;
1639 }
1640 return sg_frags;
1641
1642 }
1643
bnx2fc_map_sg(struct bnx2fc_cmd * io_req)1644 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1645 {
1646 struct bnx2fc_interface *interface = io_req->port->priv;
1647 struct bnx2fc_hba *hba = interface->hba;
1648 struct scsi_cmnd *sc = io_req->sc_cmd;
1649 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1650 struct scatterlist *sg;
1651 int byte_count = 0;
1652 int sg_count = 0;
1653 int bd_count = 0;
1654 int sg_frags;
1655 unsigned int sg_len;
1656 u64 addr;
1657 int i;
1658
1659 WARN_ON(scsi_sg_count(sc) > BNX2FC_MAX_BDS_PER_CMD);
1660 /*
1661 * Use dma_map_sg directly to ensure we're using the correct
1662 * dev struct off of pcidev.
1663 */
1664 sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1665 scsi_sg_count(sc), sc->sc_data_direction);
1666 scsi_for_each_sg(sc, sg, sg_count, i) {
1667 sg_len = sg_dma_len(sg);
1668 addr = sg_dma_address(sg);
1669 if (sg_len > BNX2FC_MAX_BD_LEN) {
1670 sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1671 bd_count);
1672 } else {
1673
1674 sg_frags = 1;
1675 bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1676 bd[bd_count].buf_addr_hi = addr >> 32;
1677 bd[bd_count].buf_len = (u16)sg_len;
1678 bd[bd_count].flags = 0;
1679 }
1680 bd_count += sg_frags;
1681 byte_count += sg_len;
1682 }
1683 if (byte_count != scsi_bufflen(sc))
1684 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1685 "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1686 io_req->xid);
1687 return bd_count;
1688 }
1689
bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd * io_req)1690 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1691 {
1692 struct scsi_cmnd *sc = io_req->sc_cmd;
1693 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1694 int bd_count;
1695
1696 if (scsi_sg_count(sc)) {
1697 bd_count = bnx2fc_map_sg(io_req);
1698 if (bd_count == 0)
1699 return -ENOMEM;
1700 } else {
1701 bd_count = 0;
1702 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1703 bd[0].buf_len = bd[0].flags = 0;
1704 }
1705 io_req->bd_tbl->bd_valid = bd_count;
1706
1707 /*
1708 * Return the command to ML if BD count exceeds the max number
1709 * that can be handled by FW.
1710 */
1711 if (bd_count > BNX2FC_FW_MAX_BDS_PER_CMD) {
1712 pr_err("bd_count = %d exceeded FW supported max BD(255), task_id = 0x%x\n",
1713 bd_count, io_req->xid);
1714 return -ENOMEM;
1715 }
1716
1717 return 0;
1718 }
1719
bnx2fc_unmap_sg_list(struct bnx2fc_cmd * io_req)1720 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1721 {
1722 struct scsi_cmnd *sc = io_req->sc_cmd;
1723 struct bnx2fc_interface *interface = io_req->port->priv;
1724 struct bnx2fc_hba *hba = interface->hba;
1725
1726 /*
1727 * Use dma_unmap_sg directly to ensure we're using the correct
1728 * dev struct off of pcidev.
1729 */
1730 if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1731 dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
1732 scsi_sg_count(sc), sc->sc_data_direction);
1733 io_req->bd_tbl->bd_valid = 0;
1734 }
1735 }
1736
bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd * io_req,struct fcp_cmnd * fcp_cmnd)1737 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1738 struct fcp_cmnd *fcp_cmnd)
1739 {
1740 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1741
1742 memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1743
1744 int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1745
1746 fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1747 memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1748
1749 fcp_cmnd->fc_cmdref = 0;
1750 fcp_cmnd->fc_pri_ta = 0;
1751 fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1752 fcp_cmnd->fc_flags = io_req->io_req_flags;
1753 fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1754 }
1755
bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd * io_req,struct fcoe_fcp_rsp_payload * fcp_rsp,u8 num_rq)1756 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1757 struct fcoe_fcp_rsp_payload *fcp_rsp,
1758 u8 num_rq)
1759 {
1760 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1761 struct bnx2fc_rport *tgt = io_req->tgt;
1762 u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1763 u32 rq_buff_len = 0;
1764 int i;
1765 unsigned char *rq_data;
1766 unsigned char *dummy;
1767 int fcp_sns_len = 0;
1768 int fcp_rsp_len = 0;
1769
1770 io_req->fcp_status = FC_GOOD;
1771 io_req->fcp_resid = 0;
1772 if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1773 FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1774 io_req->fcp_resid = fcp_rsp->fcp_resid;
1775
1776 io_req->scsi_comp_flags = rsp_flags;
1777 CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1778 fcp_rsp->scsi_status_code;
1779
1780 /* Fetch fcp_rsp_info and fcp_sns_info if available */
1781 if (num_rq) {
1782
1783 /*
1784 * We do not anticipate num_rq >1, as the linux defined
1785 * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1786 * 256 bytes of single rq buffer is good enough to hold this.
1787 */
1788
1789 if (rsp_flags &
1790 FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1791 fcp_rsp_len = rq_buff_len
1792 = fcp_rsp->fcp_rsp_len;
1793 }
1794
1795 if (rsp_flags &
1796 FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1797 fcp_sns_len = fcp_rsp->fcp_sns_len;
1798 rq_buff_len += fcp_rsp->fcp_sns_len;
1799 }
1800
1801 io_req->fcp_rsp_len = fcp_rsp_len;
1802 io_req->fcp_sns_len = fcp_sns_len;
1803
1804 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1805 /* Invalid sense sense length. */
1806 printk(KERN_ERR PFX "invalid sns length %d\n",
1807 rq_buff_len);
1808 /* reset rq_buff_len */
1809 rq_buff_len = num_rq * BNX2FC_RQ_BUF_SZ;
1810 }
1811
1812 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1813
1814 if (num_rq > 1) {
1815 /* We do not need extra sense data */
1816 for (i = 1; i < num_rq; i++)
1817 dummy = bnx2fc_get_next_rqe(tgt, 1);
1818 }
1819
1820 /* fetch fcp_rsp_code */
1821 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1822 /* Only for task management function */
1823 io_req->fcp_rsp_code = rq_data[3];
1824 BNX2FC_IO_DBG(io_req, "fcp_rsp_code = %d\n",
1825 io_req->fcp_rsp_code);
1826 }
1827
1828 /* fetch sense data */
1829 rq_data += fcp_rsp_len;
1830
1831 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1832 printk(KERN_ERR PFX "Truncating sense buffer\n");
1833 fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1834 }
1835
1836 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1837 if (fcp_sns_len)
1838 memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1839
1840 /* return RQ entries */
1841 for (i = 0; i < num_rq; i++)
1842 bnx2fc_return_rqe(tgt, 1);
1843 }
1844 }
1845
1846 /**
1847 * bnx2fc_queuecommand - Queuecommand function of the scsi template
1848 *
1849 * @host: The Scsi_Host the command was issued to
1850 * @sc_cmd: struct scsi_cmnd to be executed
1851 *
1852 * This is the IO strategy routine, called by SCSI-ML
1853 **/
bnx2fc_queuecommand(struct Scsi_Host * host,struct scsi_cmnd * sc_cmd)1854 int bnx2fc_queuecommand(struct Scsi_Host *host,
1855 struct scsi_cmnd *sc_cmd)
1856 {
1857 struct fc_lport *lport = shost_priv(host);
1858 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1859 struct fc_rport_libfc_priv *rp = rport->dd_data;
1860 struct bnx2fc_rport *tgt;
1861 struct bnx2fc_cmd *io_req;
1862 int rc = 0;
1863 int rval;
1864
1865 rval = fc_remote_port_chkready(rport);
1866 if (rval) {
1867 sc_cmd->result = rval;
1868 sc_cmd->scsi_done(sc_cmd);
1869 return 0;
1870 }
1871
1872 if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1873 rc = SCSI_MLQUEUE_HOST_BUSY;
1874 goto exit_qcmd;
1875 }
1876
1877 /* rport and tgt are allocated together, so tgt should be non-NULL */
1878 tgt = (struct bnx2fc_rport *)&rp[1];
1879
1880 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1881 /*
1882 * Session is not offloaded yet. Let SCSI-ml retry
1883 * the command.
1884 */
1885 rc = SCSI_MLQUEUE_TARGET_BUSY;
1886 goto exit_qcmd;
1887 }
1888 if (tgt->retry_delay_timestamp) {
1889 if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1890 tgt->retry_delay_timestamp = 0;
1891 } else {
1892 /* If retry_delay timer is active, flow off the ML */
1893 rc = SCSI_MLQUEUE_TARGET_BUSY;
1894 goto exit_qcmd;
1895 }
1896 }
1897
1898 spin_lock_bh(&tgt->tgt_lock);
1899
1900 io_req = bnx2fc_cmd_alloc(tgt);
1901 if (!io_req) {
1902 rc = SCSI_MLQUEUE_HOST_BUSY;
1903 goto exit_qcmd_tgtlock;
1904 }
1905 io_req->sc_cmd = sc_cmd;
1906
1907 if (bnx2fc_post_io_req(tgt, io_req)) {
1908 printk(KERN_ERR PFX "Unable to post io_req\n");
1909 rc = SCSI_MLQUEUE_HOST_BUSY;
1910 goto exit_qcmd_tgtlock;
1911 }
1912
1913 exit_qcmd_tgtlock:
1914 spin_unlock_bh(&tgt->tgt_lock);
1915 exit_qcmd:
1916 return rc;
1917 }
1918
bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd * io_req,struct fcoe_task_ctx_entry * task,u8 num_rq)1919 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1920 struct fcoe_task_ctx_entry *task,
1921 u8 num_rq)
1922 {
1923 struct fcoe_fcp_rsp_payload *fcp_rsp;
1924 struct bnx2fc_rport *tgt = io_req->tgt;
1925 struct scsi_cmnd *sc_cmd;
1926 u16 scope = 0, qualifier = 0;
1927
1928 /* scsi_cmd_cmpl is called with tgt lock held */
1929
1930 if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1931 /* we will not receive ABTS response for this IO */
1932 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1933 "this scsi cmd\n");
1934 return;
1935 }
1936
1937 /* Cancel the timeout_work, as we received IO completion */
1938 if (cancel_delayed_work(&io_req->timeout_work))
1939 kref_put(&io_req->refcount,
1940 bnx2fc_cmd_release); /* drop timer hold */
1941
1942 sc_cmd = io_req->sc_cmd;
1943 if (sc_cmd == NULL) {
1944 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1945 return;
1946 }
1947
1948 /* Fetch fcp_rsp from task context and perform cmd completion */
1949 fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1950 &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1951
1952 /* parse fcp_rsp and obtain sense data from RQ if available */
1953 bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1954
1955 if (!sc_cmd->SCp.ptr) {
1956 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1957 return;
1958 }
1959
1960 if (io_req->on_active_queue) {
1961 list_del_init(&io_req->link);
1962 io_req->on_active_queue = 0;
1963 /* Move IO req to retire queue */
1964 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1965 } else {
1966 /* This should not happen, but could have been pulled
1967 * by bnx2fc_flush_active_ios(), or during a race
1968 * between command abort and (late) completion.
1969 */
1970 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1971 if (io_req->wait_for_abts_comp)
1972 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1973 &io_req->req_flags))
1974 complete(&io_req->abts_done);
1975 }
1976
1977 bnx2fc_unmap_sg_list(io_req);
1978 io_req->sc_cmd = NULL;
1979
1980 switch (io_req->fcp_status) {
1981 case FC_GOOD:
1982 if (io_req->cdb_status == 0) {
1983 /* Good IO completion */
1984 sc_cmd->result = DID_OK << 16;
1985 } else {
1986 /* Transport status is good, SCSI status not good */
1987 BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1988 " fcp_resid = 0x%x\n",
1989 io_req->cdb_status, io_req->fcp_resid);
1990 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1991
1992 if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1993 io_req->cdb_status == SAM_STAT_BUSY) {
1994 /* Newer array firmware with BUSY or
1995 * TASK_SET_FULL may return a status that needs
1996 * the scope bits masked.
1997 * Or a huge delay timestamp up to 27 minutes
1998 * can result.
1999 */
2000 if (fcp_rsp->retry_delay_timer) {
2001 /* Upper 2 bits */
2002 scope = fcp_rsp->retry_delay_timer
2003 & 0xC000;
2004 /* Lower 14 bits */
2005 qualifier = fcp_rsp->retry_delay_timer
2006 & 0x3FFF;
2007 }
2008 if (scope > 0 && qualifier > 0 &&
2009 qualifier <= 0x3FEF) {
2010 /* Set the jiffies +
2011 * retry_delay_timer * 100ms
2012 * for the rport/tgt
2013 */
2014 tgt->retry_delay_timestamp = jiffies +
2015 (qualifier * HZ / 10);
2016 }
2017 }
2018 }
2019 if (io_req->fcp_resid)
2020 scsi_set_resid(sc_cmd, io_req->fcp_resid);
2021 break;
2022 default:
2023 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
2024 io_req->fcp_status);
2025 break;
2026 }
2027 sc_cmd->SCp.ptr = NULL;
2028 sc_cmd->scsi_done(sc_cmd);
2029 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2030 }
2031
bnx2fc_post_io_req(struct bnx2fc_rport * tgt,struct bnx2fc_cmd * io_req)2032 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
2033 struct bnx2fc_cmd *io_req)
2034 {
2035 struct fcoe_task_ctx_entry *task;
2036 struct fcoe_task_ctx_entry *task_page;
2037 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
2038 struct fcoe_port *port = tgt->port;
2039 struct bnx2fc_interface *interface = port->priv;
2040 struct bnx2fc_hba *hba = interface->hba;
2041 struct fc_lport *lport = port->lport;
2042 struct fc_stats *stats;
2043 int task_idx, index;
2044 u16 xid;
2045
2046 /* bnx2fc_post_io_req() is called with the tgt_lock held */
2047
2048 /* Initialize rest of io_req fields */
2049 io_req->cmd_type = BNX2FC_SCSI_CMD;
2050 io_req->port = port;
2051 io_req->tgt = tgt;
2052 io_req->data_xfer_len = scsi_bufflen(sc_cmd);
2053 sc_cmd->SCp.ptr = (char *)io_req;
2054
2055 stats = per_cpu_ptr(lport->stats, get_cpu());
2056 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
2057 io_req->io_req_flags = BNX2FC_READ;
2058 stats->InputRequests++;
2059 stats->InputBytes += io_req->data_xfer_len;
2060 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2061 io_req->io_req_flags = BNX2FC_WRITE;
2062 stats->OutputRequests++;
2063 stats->OutputBytes += io_req->data_xfer_len;
2064 } else {
2065 io_req->io_req_flags = 0;
2066 stats->ControlRequests++;
2067 }
2068 put_cpu();
2069
2070 xid = io_req->xid;
2071
2072 /* Build buffer descriptor list for firmware from sg list */
2073 if (bnx2fc_build_bd_list_from_sg(io_req)) {
2074 printk(KERN_ERR PFX "BD list creation failed\n");
2075 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2076 return -EAGAIN;
2077 }
2078
2079 task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2080 index = xid % BNX2FC_TASKS_PER_PAGE;
2081
2082 /* Initialize task context for this IO request */
2083 task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2084 task = &(task_page[index]);
2085 bnx2fc_init_task(io_req, task);
2086
2087 if (tgt->flush_in_prog) {
2088 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2089 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2090 return -EAGAIN;
2091 }
2092
2093 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2094 printk(KERN_ERR PFX "Session not ready...post_io\n");
2095 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2096 return -EAGAIN;
2097 }
2098
2099 /* Time IO req */
2100 if (tgt->io_timeout)
2101 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2102 /* Obtain free SQ entry */
2103 bnx2fc_add_2_sq(tgt, xid);
2104
2105 /* Enqueue the io_req to active_cmd_queue */
2106
2107 io_req->on_active_queue = 1;
2108 /* move io_req from pending_queue to active_queue */
2109 list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2110
2111 /* Ring doorbell */
2112 bnx2fc_ring_doorbell(tgt);
2113 return 0;
2114 }
2115
