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