scsi: Use struct scsi_lun in fc/fcp.h
[linux-2.6.git] / drivers / scsi / bnx2fc / bnx2fc_io.c
1 /* bnx2fc_io.c: Broadcom NetXtreme II Linux FCoE offload driver.
2  * IO manager and SCSI IO processing.
3  *
4  * Copyright (c) 2008 - 2011 Broadcom Corporation
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation.
9  *
10  * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
11  */
12
13 #include "bnx2fc.h"
14
15 #define RESERVE_FREE_LIST_INDEX num_possible_cpus()
16
17 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
18                            int bd_index);
19 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
20 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
21 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
22 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
23 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
24                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
25                                  u8 num_rq);
26
27 void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
28                           unsigned int timer_msec)
29 {
30         struct bnx2fc_interface *interface = io_req->port->priv;
31
32         if (queue_delayed_work(interface->timer_work_queue,
33                                &io_req->timeout_work,
34                                msecs_to_jiffies(timer_msec)))
35                 kref_get(&io_req->refcount);
36 }
37
38 static void bnx2fc_cmd_timeout(struct work_struct *work)
39 {
40         struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
41                                                  timeout_work.work);
42         struct fc_lport *lport;
43         struct fc_rport_priv *rdata;
44         u8 cmd_type = io_req->cmd_type;
45         struct bnx2fc_rport *tgt = io_req->tgt;
46         int logo_issued;
47         int rc;
48
49         BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
50                       "req_flags = %lx\n", cmd_type, io_req->req_flags);
51
52         spin_lock_bh(&tgt->tgt_lock);
53         if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
54                 clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
55                 /*
56                  * ideally we should hold the io_req until RRQ complets,
57                  * and release io_req from timeout hold.
58                  */
59                 spin_unlock_bh(&tgt->tgt_lock);
60                 bnx2fc_send_rrq(io_req);
61                 return;
62         }
63         if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
64                 BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
65                 goto done;
66         }
67
68         switch (cmd_type) {
69         case BNX2FC_SCSI_CMD:
70                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
71                                                         &io_req->req_flags)) {
72                         /* Handle eh_abort timeout */
73                         BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
74                         complete(&io_req->tm_done);
75                 } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
76                                     &io_req->req_flags)) {
77                         /* Handle internally generated ABTS timeout */
78                         BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
79                                         io_req->refcount.refcount.counter);
80                         if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
81                                                &io_req->req_flags))) {
82
83                                 lport = io_req->port->lport;
84                                 rdata = io_req->tgt->rdata;
85                                 logo_issued = test_and_set_bit(
86                                                 BNX2FC_FLAG_EXPL_LOGO,
87                                                 &tgt->flags);
88                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
89                                 spin_unlock_bh(&tgt->tgt_lock);
90
91                                 /* Explicitly logo the target */
92                                 if (!logo_issued) {
93                                         BNX2FC_IO_DBG(io_req, "Explicit "
94                                                    "logo - tgt flags = 0x%lx\n",
95                                                    tgt->flags);
96
97                                         mutex_lock(&lport->disc.disc_mutex);
98                                         lport->tt.rport_logoff(rdata);
99                                         mutex_unlock(&lport->disc.disc_mutex);
100                                 }
101                                 return;
102                         }
103                 } else {
104                         /* Hanlde IO timeout */
105                         BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
106                         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
107                                              &io_req->req_flags)) {
108                                 BNX2FC_IO_DBG(io_req, "IO completed before "
109                                                            " timer expiry\n");
110                                 goto done;
111                         }
112
113                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
114                                               &io_req->req_flags)) {
115                                 rc = bnx2fc_initiate_abts(io_req);
116                                 if (rc == SUCCESS)
117                                         goto done;
118                                 /*
119                                  * Explicitly logo the target if
120                                  * abts initiation fails
121                                  */
122                                 lport = io_req->port->lport;
123                                 rdata = io_req->tgt->rdata;
124                                 logo_issued = test_and_set_bit(
125                                                 BNX2FC_FLAG_EXPL_LOGO,
126                                                 &tgt->flags);
127                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
128                                 spin_unlock_bh(&tgt->tgt_lock);
129
130                                 if (!logo_issued) {
131                                         BNX2FC_IO_DBG(io_req, "Explicit "
132                                                    "logo - tgt flags = 0x%lx\n",
133                                                    tgt->flags);
134
135
136                                         mutex_lock(&lport->disc.disc_mutex);
137                                         lport->tt.rport_logoff(rdata);
138                                         mutex_unlock(&lport->disc.disc_mutex);
139                                 }
140                                 return;
141                         } else {
142                                 BNX2FC_IO_DBG(io_req, "IO already in "
143                                                       "ABTS processing\n");
144                         }
145                 }
146                 break;
147         case BNX2FC_ELS:
148
149                 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
150                         BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
151
152                         if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
153                                               &io_req->req_flags)) {
154                                 lport = io_req->port->lport;
155                                 rdata = io_req->tgt->rdata;
156                                 logo_issued = test_and_set_bit(
157                                                 BNX2FC_FLAG_EXPL_LOGO,
158                                                 &tgt->flags);
159                                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
160                                 spin_unlock_bh(&tgt->tgt_lock);
161
162                                 /* Explicitly logo the target */
163                                 if (!logo_issued) {
164                                         BNX2FC_IO_DBG(io_req, "Explicitly logo"
165                                                    "(els)\n");
166                                         mutex_lock(&lport->disc.disc_mutex);
167                                         lport->tt.rport_logoff(rdata);
168                                         mutex_unlock(&lport->disc.disc_mutex);
169                                 }
170                                 return;
171                         }
172                 } else {
173                         /*
174                          * Handle ELS timeout.
175                          * tgt_lock is used to sync compl path and timeout
176                          * path. If els compl path is processing this IO, we
177                          * have nothing to do here, just release the timer hold
178                          */
179                         BNX2FC_IO_DBG(io_req, "ELS timed out\n");
180                         if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
181                                                &io_req->req_flags))
182                                 goto done;
183
184                         /* Indicate the cb_func that this ELS is timed out */
185                         set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
186
187                         if ((io_req->cb_func) && (io_req->cb_arg)) {
188                                 io_req->cb_func(io_req->cb_arg);
189                                 io_req->cb_arg = NULL;
190                         }
191                 }
192                 break;
193         default:
194                 printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
195                         cmd_type);
196                 break;
197         }
198
199 done:
200         /* release the cmd that was held when timer was set */
201         kref_put(&io_req->refcount, bnx2fc_cmd_release);
202         spin_unlock_bh(&tgt->tgt_lock);
203 }
204
205 static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
206 {
207         /* Called with host lock held */
208         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
209
210         /*
211          * active_cmd_queue may have other command types as well,
212          * and during flush operation,  we want to error back only
213          * scsi commands.
214          */
215         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
216                 return;
217
218         BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
219         if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
220                 /* Do not call scsi done for this IO */
221                 return;
222         }
223
224         bnx2fc_unmap_sg_list(io_req);
225         io_req->sc_cmd = NULL;
226         if (!sc_cmd) {
227                 printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
228                                     "IO(0x%x) already cleaned up\n",
229                        io_req->xid);
230                 return;
231         }
232         sc_cmd->result = err_code << 16;
233
234         BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
235                 sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
236                 sc_cmd->allowed);
237         scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
238         sc_cmd->SCp.ptr = NULL;
239         sc_cmd->scsi_done(sc_cmd);
240 }
241
242 struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba,
243                                                 u16 min_xid, u16 max_xid)
244 {
245         struct bnx2fc_cmd_mgr *cmgr;
246         struct io_bdt *bdt_info;
247         struct bnx2fc_cmd *io_req;
248         size_t len;
249         u32 mem_size;
250         u16 xid;
251         int i;
252         int num_ios, num_pri_ios;
253         size_t bd_tbl_sz;
254         int arr_sz = num_possible_cpus() + 1;
255
256         if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
257                 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
258                                         and max_xid 0x%x\n", min_xid, max_xid);
259                 return NULL;
260         }
261         BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
262
263         num_ios = max_xid - min_xid + 1;
264         len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
265         len += sizeof(struct bnx2fc_cmd_mgr);
266
267         cmgr = kzalloc(len, GFP_KERNEL);
268         if (!cmgr) {
269                 printk(KERN_ERR PFX "failed to alloc cmgr\n");
270                 return NULL;
271         }
272
273         cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
274                                   arr_sz, GFP_KERNEL);
275         if (!cmgr->free_list) {
276                 printk(KERN_ERR PFX "failed to alloc free_list\n");
277                 goto mem_err;
278         }
279
280         cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
281                                        arr_sz, GFP_KERNEL);
282         if (!cmgr->free_list_lock) {
283                 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
284                 goto mem_err;
285         }
286
287         cmgr->hba = hba;
288         cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
289
290         for (i = 0; i < arr_sz; i++)  {
291                 INIT_LIST_HEAD(&cmgr->free_list[i]);
292                 spin_lock_init(&cmgr->free_list_lock[i]);
293         }
294
295         /*
296          * Pre-allocated pool of bnx2fc_cmds.
297          * Last entry in the free list array is the free list
298          * of slow path requests.
299          */
300         xid = BNX2FC_MIN_XID;
301         num_pri_ios = num_ios - BNX2FC_ELSTM_XIDS;
302         for (i = 0; i < num_ios; i++) {
303                 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
304
305                 if (!io_req) {
306                         printk(KERN_ERR PFX "failed to alloc io_req\n");
307                         goto mem_err;
308                 }
309
310                 INIT_LIST_HEAD(&io_req->link);
311                 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
312
313                 io_req->xid = xid++;
314                 if (i < num_pri_ios)
315                         list_add_tail(&io_req->link,
316                                 &cmgr->free_list[io_req->xid %
317                                                  num_possible_cpus()]);
318                 else
319                         list_add_tail(&io_req->link,
320                                 &cmgr->free_list[num_possible_cpus()]);
321                 io_req++;
322         }
323
324         /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
325         mem_size = num_ios * sizeof(struct io_bdt *);
326         cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
327         if (!cmgr->io_bdt_pool) {
328                 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
329                 goto mem_err;
330         }
331
332         mem_size = sizeof(struct io_bdt);
333         for (i = 0; i < num_ios; i++) {
334                 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
335                 if (!cmgr->io_bdt_pool[i]) {
336                         printk(KERN_ERR PFX "failed to alloc "
337                                 "io_bdt_pool[%d]\n", i);
338                         goto mem_err;
339                 }
340         }
341
342         /* Allocate an map fcoe_bdt_ctx structures */
343         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
344         for (i = 0; i < num_ios; i++) {
345                 bdt_info = cmgr->io_bdt_pool[i];
346                 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
347                                                       bd_tbl_sz,
348                                                       &bdt_info->bd_tbl_dma,
349                                                       GFP_KERNEL);
350                 if (!bdt_info->bd_tbl) {
351                         printk(KERN_ERR PFX "failed to alloc "
352                                 "bdt_tbl[%d]\n", i);
353                         goto mem_err;
354                 }
355         }
356
357         return cmgr;
358
359 mem_err:
360         bnx2fc_cmd_mgr_free(cmgr);
361         return NULL;
362 }
363
364 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
365 {
366         struct io_bdt *bdt_info;
367         struct bnx2fc_hba *hba = cmgr->hba;
368         size_t bd_tbl_sz;
369         u16 min_xid = BNX2FC_MIN_XID;
370         u16 max_xid = BNX2FC_MAX_XID;
371         int num_ios;
372         int i;
373
374         num_ios = max_xid - min_xid + 1;
375
376         /* Free fcoe_bdt_ctx structures */
377         if (!cmgr->io_bdt_pool)
378                 goto free_cmd_pool;
379
380         bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
381         for (i = 0; i < num_ios; i++) {
382                 bdt_info = cmgr->io_bdt_pool[i];
383                 if (bdt_info->bd_tbl) {
384                         dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
385                                             bdt_info->bd_tbl,
386                                             bdt_info->bd_tbl_dma);
387                         bdt_info->bd_tbl = NULL;
388                 }
389         }
390
391         /* Destroy io_bdt pool */
392         for (i = 0; i < num_ios; i++) {
393                 kfree(cmgr->io_bdt_pool[i]);
394                 cmgr->io_bdt_pool[i] = NULL;
395         }
396
397         kfree(cmgr->io_bdt_pool);
398         cmgr->io_bdt_pool = NULL;
399
400 free_cmd_pool:
401         kfree(cmgr->free_list_lock);
402
403         /* Destroy cmd pool */
404         if (!cmgr->free_list)
405                 goto free_cmgr;
406
407         for (i = 0; i < num_possible_cpus() + 1; i++)  {
408                 struct list_head *list;
409                 struct list_head *tmp;
410
411                 list_for_each_safe(list, tmp, &cmgr->free_list[i]) {
412                         struct bnx2fc_cmd *io_req = (struct bnx2fc_cmd *)list;
413                         list_del(&io_req->link);
414                         kfree(io_req);
415                 }
416         }
417         kfree(cmgr->free_list);
418 free_cmgr:
419         /* Free command manager itself */
420         kfree(cmgr);
421 }
422
423 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
424 {
425         struct fcoe_port *port = tgt->port;
426         struct bnx2fc_interface *interface = port->priv;
427         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
428         struct bnx2fc_cmd *io_req;
429         struct list_head *listp;
430         struct io_bdt *bd_tbl;
431         int index = RESERVE_FREE_LIST_INDEX;
432         u32 free_sqes;
433         u32 max_sqes;
434         u16 xid;
435
436         max_sqes = tgt->max_sqes;
437         switch (type) {
438         case BNX2FC_TASK_MGMT_CMD:
439                 max_sqes = BNX2FC_TM_MAX_SQES;
440                 break;
441         case BNX2FC_ELS:
442                 max_sqes = BNX2FC_ELS_MAX_SQES;
443                 break;
444         default:
445                 break;
446         }
447
448         /*
449          * NOTE: Free list insertions and deletions are protected with
450          * cmgr lock
451          */
452         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
453         free_sqes = atomic_read(&tgt->free_sqes);
454         if ((list_empty(&(cmd_mgr->free_list[index]))) ||
455             (tgt->num_active_ios.counter  >= max_sqes) ||
456             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
457                 BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
458                         "ios(%d):sqes(%d)\n",
459                         tgt->num_active_ios.counter, tgt->max_sqes);
460                 if (list_empty(&(cmd_mgr->free_list[index])))
461                         printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
462                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
463                 return NULL;
464         }
465
466         listp = (struct list_head *)
467                         cmd_mgr->free_list[index].next;
468         list_del_init(listp);
469         io_req = (struct bnx2fc_cmd *) listp;
470         xid = io_req->xid;
471         cmd_mgr->cmds[xid] = io_req;
472         atomic_inc(&tgt->num_active_ios);
473         atomic_dec(&tgt->free_sqes);
474         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
475
476         INIT_LIST_HEAD(&io_req->link);
477
478         io_req->port = port;
479         io_req->cmd_mgr = cmd_mgr;
480         io_req->req_flags = 0;
481         io_req->cmd_type = type;
482
483         /* Bind io_bdt for this io_req */
484         /* Have a static link between io_req and io_bdt_pool */
485         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
486         bd_tbl->io_req = io_req;
487
488         /* Hold the io_req  against deletion */
489         kref_init(&io_req->refcount);
490         return io_req;
491 }
492
493 struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
494 {
495         struct fcoe_port *port = tgt->port;
496         struct bnx2fc_interface *interface = port->priv;
497         struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
498         struct bnx2fc_cmd *io_req;
499         struct list_head *listp;
500         struct io_bdt *bd_tbl;
501         u32 free_sqes;
502         u32 max_sqes;
503         u16 xid;
504         int index = get_cpu();
505
506         max_sqes = BNX2FC_SCSI_MAX_SQES;
507         /*
508          * NOTE: Free list insertions and deletions are protected with
509          * cmgr lock
510          */
511         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
512         free_sqes = atomic_read(&tgt->free_sqes);
513         if ((list_empty(&cmd_mgr->free_list[index])) ||
514             (tgt->num_active_ios.counter  >= max_sqes) ||
515             (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
516                 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
517                 put_cpu();
518                 return NULL;
519         }
520
521         listp = (struct list_head *)
522                 cmd_mgr->free_list[index].next;
523         list_del_init(listp);
524         io_req = (struct bnx2fc_cmd *) listp;
525         xid = io_req->xid;
526         cmd_mgr->cmds[xid] = io_req;
527         atomic_inc(&tgt->num_active_ios);
528         atomic_dec(&tgt->free_sqes);
529         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
530         put_cpu();
531
532         INIT_LIST_HEAD(&io_req->link);
533
534         io_req->port = port;
535         io_req->cmd_mgr = cmd_mgr;
536         io_req->req_flags = 0;
537
538         /* Bind io_bdt for this io_req */
539         /* Have a static link between io_req and io_bdt_pool */
540         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
541         bd_tbl->io_req = io_req;
542
543         /* Hold the io_req  against deletion */
544         kref_init(&io_req->refcount);
545         return io_req;
546 }
547
548 void bnx2fc_cmd_release(struct kref *ref)
549 {
550         struct bnx2fc_cmd *io_req = container_of(ref,
551                                                 struct bnx2fc_cmd, refcount);
552         struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
553         int index;
554
555         if (io_req->cmd_type == BNX2FC_SCSI_CMD)
556                 index = io_req->xid % num_possible_cpus();
557         else
558                 index = RESERVE_FREE_LIST_INDEX;
559
560
561         spin_lock_bh(&cmd_mgr->free_list_lock[index]);
562         if (io_req->cmd_type != BNX2FC_SCSI_CMD)
563                 bnx2fc_free_mp_resc(io_req);
564         cmd_mgr->cmds[io_req->xid] = NULL;
565         /* Delete IO from retire queue */
566         list_del_init(&io_req->link);
567         /* Add it to the free list */
568         list_add(&io_req->link,
569                         &cmd_mgr->free_list[index]);
570         atomic_dec(&io_req->tgt->num_active_ios);
571         spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
572
573 }
574
575 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
576 {
577         struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
578         struct bnx2fc_interface *interface = io_req->port->priv;
579         struct bnx2fc_hba *hba = interface->hba;
580         size_t sz = sizeof(struct fcoe_bd_ctx);
581
582         /* clear tm flags */
583         mp_req->tm_flags = 0;
584         if (mp_req->mp_req_bd) {
585                 dma_free_coherent(&hba->pcidev->dev, sz,
586                                      mp_req->mp_req_bd,
587                                      mp_req->mp_req_bd_dma);
588                 mp_req->mp_req_bd = NULL;
589         }
590         if (mp_req->mp_resp_bd) {
591                 dma_free_coherent(&hba->pcidev->dev, sz,
592                                      mp_req->mp_resp_bd,
593                                      mp_req->mp_resp_bd_dma);
594                 mp_req->mp_resp_bd = NULL;
595         }
596         if (mp_req->req_buf) {
597                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
598                                      mp_req->req_buf,
599                                      mp_req->req_buf_dma);
600                 mp_req->req_buf = NULL;
601         }
602         if (mp_req->resp_buf) {
603                 dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
604                                      mp_req->resp_buf,
605                                      mp_req->resp_buf_dma);
606                 mp_req->resp_buf = NULL;
607         }
608 }
609
610 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
611 {
612         struct bnx2fc_mp_req *mp_req;
613         struct fcoe_bd_ctx *mp_req_bd;
614         struct fcoe_bd_ctx *mp_resp_bd;
615         struct bnx2fc_interface *interface = io_req->port->priv;
616         struct bnx2fc_hba *hba = interface->hba;
617         dma_addr_t addr;
618         size_t sz;
619
620         mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
621         memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
622
623         mp_req->req_len = sizeof(struct fcp_cmnd);
624         io_req->data_xfer_len = mp_req->req_len;
625         mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
626                                              &mp_req->req_buf_dma,
627                                              GFP_ATOMIC);
628         if (!mp_req->req_buf) {
629                 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
630                 bnx2fc_free_mp_resc(io_req);
631                 return FAILED;
632         }
633
634         mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
635                                               &mp_req->resp_buf_dma,
636                                               GFP_ATOMIC);
637         if (!mp_req->resp_buf) {
638                 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
639                 bnx2fc_free_mp_resc(io_req);
640                 return FAILED;
641         }
642         memset(mp_req->req_buf, 0, PAGE_SIZE);
643         memset(mp_req->resp_buf, 0, PAGE_SIZE);
644
645         /* Allocate and map mp_req_bd and mp_resp_bd */
646         sz = sizeof(struct fcoe_bd_ctx);
647         mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
648                                                  &mp_req->mp_req_bd_dma,
649                                                  GFP_ATOMIC);
650         if (!mp_req->mp_req_bd) {
651                 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
652                 bnx2fc_free_mp_resc(io_req);
653                 return FAILED;
654         }
655         mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
656                                                  &mp_req->mp_resp_bd_dma,
657                                                  GFP_ATOMIC);
658         if (!mp_req->mp_req_bd) {
659                 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
660                 bnx2fc_free_mp_resc(io_req);
661                 return FAILED;
662         }
663         /* Fill bd table */
664         addr = mp_req->req_buf_dma;
665         mp_req_bd = mp_req->mp_req_bd;
666         mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
667         mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
668         mp_req_bd->buf_len = PAGE_SIZE;
669         mp_req_bd->flags = 0;
670
671         /*
672          * MP buffer is either a task mgmt command or an ELS.
673          * So the assumption is that it consumes a single bd
674          * entry in the bd table
675          */
676         mp_resp_bd = mp_req->mp_resp_bd;
677         addr = mp_req->resp_buf_dma;
678         mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
679         mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
680         mp_resp_bd->buf_len = PAGE_SIZE;
681         mp_resp_bd->flags = 0;
682
683         return SUCCESS;
684 }
685
686 static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
687 {
688         struct fc_lport *lport;
689         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
690         struct fc_rport_libfc_priv *rp = rport->dd_data;
691         struct fcoe_port *port;
692         struct bnx2fc_interface *interface;
693         struct bnx2fc_rport *tgt;
694         struct bnx2fc_cmd *io_req;
695         struct bnx2fc_mp_req *tm_req;
696         struct fcoe_task_ctx_entry *task;
697         struct fcoe_task_ctx_entry *task_page;
698         struct Scsi_Host *host = sc_cmd->device->host;
699         struct fc_frame_header *fc_hdr;
700         struct fcp_cmnd *fcp_cmnd;
701         int task_idx, index;
702         int rc = SUCCESS;
703         u16 xid;
704         u32 sid, did;
705         unsigned long start = jiffies;
706
707         lport = shost_priv(host);
708         port = lport_priv(lport);
709         interface = port->priv;
710
711         if (rport == NULL) {
712                 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
713                 rc = FAILED;
714                 goto tmf_err;
715         }
716
717         rc = fc_block_scsi_eh(sc_cmd);
718         if (rc)
719                 return rc;
720
721         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
722                 printk(KERN_ERR PFX "device_reset: link is not ready\n");
723                 rc = FAILED;
724                 goto tmf_err;
725         }
726         /* rport and tgt are allocated together, so tgt should be non-NULL */
727         tgt = (struct bnx2fc_rport *)&rp[1];
728
729         if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
730                 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
731                 rc = FAILED;
732                 goto tmf_err;
733         }
734 retry_tmf:
735         io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
736         if (!io_req) {
737                 if (time_after(jiffies, start + HZ)) {
738                         printk(KERN_ERR PFX "tmf: Failed TMF");
739                         rc = FAILED;
740                         goto tmf_err;
741                 }
742                 msleep(20);
743                 goto retry_tmf;
744         }
745         /* Initialize rest of io_req fields */
746         io_req->sc_cmd = sc_cmd;
747         io_req->port = port;
748         io_req->tgt = tgt;
749
750         tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
751
752         rc = bnx2fc_init_mp_req(io_req);
753         if (rc == FAILED) {
754                 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
755                 spin_lock_bh(&tgt->tgt_lock);
756                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
757                 spin_unlock_bh(&tgt->tgt_lock);
758                 goto tmf_err;
759         }
760
761         /* Set TM flags */
762         io_req->io_req_flags = 0;
763         tm_req->tm_flags = tm_flags;
764
765         /* Fill FCP_CMND */
766         bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
767         fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
768         memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
769         fcp_cmnd->fc_dl = 0;
770
771         /* Fill FC header */
772         fc_hdr = &(tm_req->req_fc_hdr);
773         sid = tgt->sid;
774         did = rport->port_id;
775         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
776                            FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
777                            FC_FC_SEQ_INIT, 0);
778         /* Obtain exchange id */
779         xid = io_req->xid;
780
781         BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
782         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
783         index = xid % BNX2FC_TASKS_PER_PAGE;
784
785         /* Initialize task context for this IO request */
786         task_page = (struct fcoe_task_ctx_entry *)
787                         interface->hba->task_ctx[task_idx];
788         task = &(task_page[index]);
789         bnx2fc_init_mp_task(io_req, task);
790
791         sc_cmd->SCp.ptr = (char *)io_req;
792
793         /* Obtain free SQ entry */
794         spin_lock_bh(&tgt->tgt_lock);
795         bnx2fc_add_2_sq(tgt, xid);
796
797         /* Enqueue the io_req to active_tm_queue */
798         io_req->on_tmf_queue = 1;
799         list_add_tail(&io_req->link, &tgt->active_tm_queue);
800
801         init_completion(&io_req->tm_done);
802         io_req->wait_for_comp = 1;
803
804         /* Ring doorbell */
805         bnx2fc_ring_doorbell(tgt);
806         spin_unlock_bh(&tgt->tgt_lock);
807
808         rc = wait_for_completion_timeout(&io_req->tm_done,
809                                          BNX2FC_TM_TIMEOUT * HZ);
810         spin_lock_bh(&tgt->tgt_lock);
811
812         io_req->wait_for_comp = 0;
813         if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags)))
814                 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
815
816         spin_unlock_bh(&tgt->tgt_lock);
817
818         if (!rc) {
819                 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
820                 rc = FAILED;
821         } else {
822                 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
823                 rc = SUCCESS;
824         }
825 tmf_err:
826         return rc;
827 }
828
829 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
830 {
831         struct fc_lport *lport;
832         struct bnx2fc_rport *tgt = io_req->tgt;
833         struct fc_rport *rport = tgt->rport;
834         struct fc_rport_priv *rdata = tgt->rdata;
835         struct bnx2fc_interface *interface;
836         struct fcoe_port *port;
837         struct bnx2fc_cmd *abts_io_req;
838         struct fcoe_task_ctx_entry *task;
839         struct fcoe_task_ctx_entry *task_page;
840         struct fc_frame_header *fc_hdr;
841         struct bnx2fc_mp_req *abts_req;
842         int task_idx, index;
843         u32 sid, did;
844         u16 xid;
845         int rc = SUCCESS;
846         u32 r_a_tov = rdata->r_a_tov;
847
848         /* called with tgt_lock held */
849         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
850
851         port = io_req->port;
852         interface = port->priv;
853         lport = port->lport;
854
855         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
856                 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
857                 rc = FAILED;
858                 goto abts_err;
859         }
860
861         if (rport == NULL) {
862                 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
863                 rc = FAILED;
864                 goto abts_err;
865         }
866
867         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
868                 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
869                 rc = FAILED;
870                 goto abts_err;
871         }
872
873         abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
874         if (!abts_io_req) {
875                 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
876                 rc = FAILED;
877                 goto abts_err;
878         }
879
880         /* Initialize rest of io_req fields */
881         abts_io_req->sc_cmd = NULL;
882         abts_io_req->port = port;
883         abts_io_req->tgt = tgt;
884         abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
885
886         abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
887         memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
888
889         /* Fill FC header */
890         fc_hdr = &(abts_req->req_fc_hdr);
891
892         /* Obtain oxid and rxid for the original exchange to be aborted */
893         fc_hdr->fh_ox_id = htons(io_req->xid);
894         fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
895
896         sid = tgt->sid;
897         did = rport->port_id;
898
899         __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
900                            FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
901                            FC_FC_SEQ_INIT, 0);
902
903         xid = abts_io_req->xid;
904         BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
905         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
906         index = xid % BNX2FC_TASKS_PER_PAGE;
907
908         /* Initialize task context for this IO request */
909         task_page = (struct fcoe_task_ctx_entry *)
910                         interface->hba->task_ctx[task_idx];
911         task = &(task_page[index]);
912         bnx2fc_init_mp_task(abts_io_req, task);
913
914         /*
915          * ABTS task is a temporary task that will be cleaned up
916          * irrespective of ABTS response. We need to start the timer
917          * for the original exchange, as the CQE is posted for the original
918          * IO request.
919          *
920          * Timer for ABTS is started only when it is originated by a
921          * TM request. For the ABTS issued as part of ULP timeout,
922          * scsi-ml maintains the timers.
923          */
924
925         /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
926         bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
927
928         /* Obtain free SQ entry */
929         bnx2fc_add_2_sq(tgt, xid);
930
931         /* Ring doorbell */
932         bnx2fc_ring_doorbell(tgt);
933
934 abts_err:
935         return rc;
936 }
937
938 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
939                                 enum fc_rctl r_ctl)
940 {
941         struct fc_lport *lport;
942         struct bnx2fc_rport *tgt = orig_io_req->tgt;
943         struct bnx2fc_interface *interface;
944         struct fcoe_port *port;
945         struct bnx2fc_cmd *seq_clnp_req;
946         struct fcoe_task_ctx_entry *task;
947         struct fcoe_task_ctx_entry *task_page;
948         struct bnx2fc_els_cb_arg *cb_arg = NULL;
949         int task_idx, index;
950         u16 xid;
951         int rc = 0;
952
953         BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
954                    orig_io_req->xid);
955         kref_get(&orig_io_req->refcount);
956
957         port = orig_io_req->port;
958         interface = port->priv;
959         lport = port->lport;
960
961         cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
962         if (!cb_arg) {
963                 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
964                 rc = -ENOMEM;
965                 goto cleanup_err;
966         }
967
968         seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
969         if (!seq_clnp_req) {
970                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
971                 rc = -ENOMEM;
972                 kfree(cb_arg);
973                 goto cleanup_err;
974         }
975         /* Initialize rest of io_req fields */
976         seq_clnp_req->sc_cmd = NULL;
977         seq_clnp_req->port = port;
978         seq_clnp_req->tgt = tgt;
979         seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
980
981         xid = seq_clnp_req->xid;
982
983         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
984         index = xid % BNX2FC_TASKS_PER_PAGE;
985
986         /* Initialize task context for this IO request */
987         task_page = (struct fcoe_task_ctx_entry *)
988                      interface->hba->task_ctx[task_idx];
989         task = &(task_page[index]);
990         cb_arg->aborted_io_req = orig_io_req;
991         cb_arg->io_req = seq_clnp_req;
992         cb_arg->r_ctl = r_ctl;
993         cb_arg->offset = offset;
994         seq_clnp_req->cb_arg = cb_arg;
995
996         printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
997         bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
998
999         /* Obtain free SQ entry */
1000         bnx2fc_add_2_sq(tgt, xid);
1001
1002         /* Ring doorbell */
1003         bnx2fc_ring_doorbell(tgt);
1004 cleanup_err:
1005         return rc;
1006 }
1007
1008 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1009 {
1010         struct fc_lport *lport;
1011         struct bnx2fc_rport *tgt = io_req->tgt;
1012         struct bnx2fc_interface *interface;
1013         struct fcoe_port *port;
1014         struct bnx2fc_cmd *cleanup_io_req;
1015         struct fcoe_task_ctx_entry *task;
1016         struct fcoe_task_ctx_entry *task_page;
1017         int task_idx, index;
1018         u16 xid, orig_xid;
1019         int rc = 0;
1020
1021         /* ASSUMPTION: called with tgt_lock held */
1022         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1023
1024         port = io_req->port;
1025         interface = port->priv;
1026         lport = port->lport;
1027
1028         cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1029         if (!cleanup_io_req) {
1030                 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1031                 rc = -1;
1032                 goto cleanup_err;
1033         }
1034
1035         /* Initialize rest of io_req fields */
1036         cleanup_io_req->sc_cmd = NULL;
1037         cleanup_io_req->port = port;
1038         cleanup_io_req->tgt = tgt;
1039         cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1040
1041         xid = cleanup_io_req->xid;
1042
1043         task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1044         index = xid % BNX2FC_TASKS_PER_PAGE;
1045
1046         /* Initialize task context for this IO request */
1047         task_page = (struct fcoe_task_ctx_entry *)
1048                         interface->hba->task_ctx[task_idx];
1049         task = &(task_page[index]);
1050         orig_xid = io_req->xid;
1051
1052         BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1053
1054         bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1055
1056         /* Obtain free SQ entry */
1057         bnx2fc_add_2_sq(tgt, xid);
1058
1059         /* Ring doorbell */
1060         bnx2fc_ring_doorbell(tgt);
1061
1062 cleanup_err:
1063         return rc;
1064 }
1065
1066 /**
1067  * bnx2fc_eh_target_reset: Reset a target
1068  *
1069  * @sc_cmd:     SCSI command
1070  *
1071  * Set from SCSI host template to send task mgmt command to the target
1072  *      and wait for the response
1073  */
1074 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1075 {
1076         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1077 }
1078
1079 /**
1080  * bnx2fc_eh_device_reset - Reset a single LUN
1081  *
1082  * @sc_cmd:     SCSI command
1083  *
1084  * Set from SCSI host template to send task mgmt command to the target
1085  *      and wait for the response
1086  */
1087 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1088 {
1089         return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1090 }
1091
1092 /**
1093  * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1094  *                      SCSI command
1095  *
1096  * @sc_cmd:     SCSI_ML command pointer
1097  *
1098  * SCSI abort request handler
1099  */
1100 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1101 {
1102         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1103         struct fc_rport_libfc_priv *rp = rport->dd_data;
1104         struct bnx2fc_cmd *io_req;
1105         struct fc_lport *lport;
1106         struct fc_rport_priv *rdata;
1107         struct bnx2fc_rport *tgt;
1108         int logo_issued;
1109         int wait_cnt = 0;
1110         int rc = FAILED;
1111
1112
1113         rc = fc_block_scsi_eh(sc_cmd);
1114         if (rc)
1115                 return rc;
1116
1117         lport = shost_priv(sc_cmd->device->host);
1118         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1119                 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1120                 return rc;
1121         }
1122
1123         tgt = (struct bnx2fc_rport *)&rp[1];
1124
1125         BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1126
1127         spin_lock_bh(&tgt->tgt_lock);
1128         io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1129         if (!io_req) {
1130                 /* Command might have just completed */
1131                 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1132                 spin_unlock_bh(&tgt->tgt_lock);
1133                 return SUCCESS;
1134         }
1135         BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1136                       io_req->refcount.refcount.counter);
1137
1138         /* Hold IO request across abort processing */
1139         kref_get(&io_req->refcount);
1140
1141         BUG_ON(tgt != io_req->tgt);
1142
1143         /* Remove the io_req from the active_q. */
1144         /*
1145          * Task Mgmt functions (LUN RESET & TGT RESET) will not
1146          * issue an ABTS on this particular IO req, as the
1147          * io_req is no longer in the active_q.
1148          */
1149         if (tgt->flush_in_prog) {
1150                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1151                         "flush in progress\n", io_req->xid);
1152                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1153                 spin_unlock_bh(&tgt->tgt_lock);
1154                 return SUCCESS;
1155         }
1156
1157         if (io_req->on_active_queue == 0) {
1158                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1159                                 "not on active_q\n", io_req->xid);
1160                 /*
1161                  * This condition can happen only due to the FW bug,
1162                  * where we do not receive cleanup response from
1163                  * the FW. Handle this case gracefully by erroring
1164                  * back the IO request to SCSI-ml
1165                  */
1166                 bnx2fc_scsi_done(io_req, DID_ABORT);
1167
1168                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1169                 spin_unlock_bh(&tgt->tgt_lock);
1170                 return SUCCESS;
1171         }
1172
1173         /*
1174          * Only eh_abort processing will remove the IO from
1175          * active_cmd_q before processing the request. this is
1176          * done to avoid race conditions between IOs aborted
1177          * as part of task management completion and eh_abort
1178          * processing
1179          */
1180         list_del_init(&io_req->link);
1181         io_req->on_active_queue = 0;
1182         /* Move IO req to retire queue */
1183         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1184
1185         init_completion(&io_req->tm_done);
1186         io_req->wait_for_comp = 1;
1187
1188         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1189                 /* Cancel the current timer running on this io_req */
1190                 if (cancel_delayed_work(&io_req->timeout_work))
1191                         kref_put(&io_req->refcount,
1192                                  bnx2fc_cmd_release); /* drop timer hold */
1193                 set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1194                 rc = bnx2fc_initiate_abts(io_req);
1195         } else {
1196                 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1197                                 "already in abts processing\n", io_req->xid);
1198                 if (cancel_delayed_work(&io_req->timeout_work))
1199                         kref_put(&io_req->refcount,
1200                                  bnx2fc_cmd_release); /* drop timer hold */
1201                 bnx2fc_initiate_cleanup(io_req);
1202
1203                 spin_unlock_bh(&tgt->tgt_lock);
1204
1205                 wait_for_completion(&io_req->tm_done);
1206
1207                 spin_lock_bh(&tgt->tgt_lock);
1208                 io_req->wait_for_comp = 0;
1209                 rdata = io_req->tgt->rdata;
1210                 logo_issued = test_and_set_bit(BNX2FC_FLAG_EXPL_LOGO,
1211                                                &tgt->flags);
1212                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1213                 spin_unlock_bh(&tgt->tgt_lock);
1214
1215                 if (!logo_issued) {
1216                         BNX2FC_IO_DBG(io_req, "Expl logo - tgt flags = 0x%lx\n",
1217                                       tgt->flags);
1218                         mutex_lock(&lport->disc.disc_mutex);
1219                         lport->tt.rport_logoff(rdata);
1220                         mutex_unlock(&lport->disc.disc_mutex);
1221                         do {
1222                                 msleep(BNX2FC_RELOGIN_WAIT_TIME);
1223                                 /*
1224                                  * If session not recovered, let SCSI-ml
1225                                  * escalate error recovery.
1226                                  */
1227                                 if (wait_cnt++ > BNX2FC_RELOGIN_WAIT_CNT)
1228                                         return FAILED;
1229                         } while (!test_bit(BNX2FC_FLAG_SESSION_READY,
1230                                            &tgt->flags));
1231                 }
1232                 return SUCCESS;
1233         }
1234         if (rc == FAILED) {
1235                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1236                 spin_unlock_bh(&tgt->tgt_lock);
1237                 return rc;
1238         }
1239         spin_unlock_bh(&tgt->tgt_lock);
1240
1241         wait_for_completion(&io_req->tm_done);
1242
1243         spin_lock_bh(&tgt->tgt_lock);
1244         io_req->wait_for_comp = 0;
1245         if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1246                                     &io_req->req_flags))) {
1247                 /* Let the scsi-ml try to recover this command */
1248                 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1249                        io_req->xid);
1250                 rc = FAILED;
1251         } else {
1252                 /*
1253                  * We come here even when there was a race condition
1254                  * between timeout and abts completion, and abts
1255                  * completion happens just in time.
1256                  */
1257                 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1258                 rc = SUCCESS;
1259                 bnx2fc_scsi_done(io_req, DID_ABORT);
1260                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1261         }
1262
1263         /* release the reference taken in eh_abort */
1264         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1265         spin_unlock_bh(&tgt->tgt_lock);
1266         return rc;
1267 }
1268
1269 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1270                                       struct fcoe_task_ctx_entry *task,
1271                                       u8 rx_state)
1272 {
1273         struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1274         struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1275         u32 offset = cb_arg->offset;
1276         enum fc_rctl r_ctl = cb_arg->r_ctl;
1277         int rc = 0;
1278         struct bnx2fc_rport *tgt = orig_io_req->tgt;
1279
1280         BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1281                               "cmd_type = %d\n",
1282                    seq_clnp_req->xid, seq_clnp_req->cmd_type);
1283
1284         if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1285                 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1286                         seq_clnp_req->xid);
1287                 goto free_cb_arg;
1288         }
1289
1290         spin_unlock_bh(&tgt->tgt_lock);
1291         rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1292         spin_lock_bh(&tgt->tgt_lock);
1293
1294         if (rc)
1295                 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1296                         " IO will abort\n");
1297         seq_clnp_req->cb_arg = NULL;
1298         kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1299 free_cb_arg:
1300         kfree(cb_arg);
1301         return;
1302 }
1303
1304 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1305                                   struct fcoe_task_ctx_entry *task,
1306                                   u8 num_rq)
1307 {
1308         BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1309                               "refcnt = %d, cmd_type = %d\n",
1310                    io_req->refcount.refcount.counter, io_req->cmd_type);
1311         bnx2fc_scsi_done(io_req, DID_ERROR);
1312         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1313         if (io_req->wait_for_comp)
1314                 complete(&io_req->tm_done);
1315 }
1316
1317 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1318                                struct fcoe_task_ctx_entry *task,
1319                                u8 num_rq)
1320 {
1321         u32 r_ctl;
1322         u32 r_a_tov = FC_DEF_R_A_TOV;
1323         u8 issue_rrq = 0;
1324         struct bnx2fc_rport *tgt = io_req->tgt;
1325
1326         BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1327                               "refcnt = %d, cmd_type = %d\n",
1328                    io_req->xid,
1329                    io_req->refcount.refcount.counter, io_req->cmd_type);
1330
1331         if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1332                                        &io_req->req_flags)) {
1333                 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1334                                 " this io\n");
1335                 return;
1336         }
1337
1338         /* Do not issue RRQ as this IO is already cleanedup */
1339         if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1340                                 &io_req->req_flags))
1341                 goto io_compl;
1342
1343         /*
1344          * For ABTS issued due to SCSI eh_abort_handler, timeout
1345          * values are maintained by scsi-ml itself. Cancel timeout
1346          * in case ABTS issued as part of task management function
1347          * or due to FW error.
1348          */
1349         if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1350                 if (cancel_delayed_work(&io_req->timeout_work))
1351                         kref_put(&io_req->refcount,
1352                                  bnx2fc_cmd_release); /* drop timer hold */
1353
1354         r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1355
1356         switch (r_ctl) {
1357         case FC_RCTL_BA_ACC:
1358                 /*
1359                  * Dont release this cmd yet. It will be relesed
1360                  * after we get RRQ response
1361                  */
1362                 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1363                 issue_rrq = 1;
1364                 break;
1365
1366         case FC_RCTL_BA_RJT:
1367                 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1368                 break;
1369         default:
1370                 printk(KERN_ERR PFX "Unknown ABTS response\n");
1371                 break;
1372         }
1373
1374         if (issue_rrq) {
1375                 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1376                 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1377         }
1378         set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1379         bnx2fc_cmd_timer_set(io_req, r_a_tov);
1380
1381 io_compl:
1382         if (io_req->wait_for_comp) {
1383                 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1384                                        &io_req->req_flags))
1385                         complete(&io_req->tm_done);
1386         } else {
1387                 /*
1388                  * We end up here when ABTS is issued as
1389                  * in asynchronous context, i.e., as part
1390                  * of task management completion, or
1391                  * when FW error is received or when the
1392                  * ABTS is issued when the IO is timed
1393                  * out.
1394                  */
1395
1396                 if (io_req->on_active_queue) {
1397                         list_del_init(&io_req->link);
1398                         io_req->on_active_queue = 0;
1399                         /* Move IO req to retire queue */
1400                         list_add_tail(&io_req->link, &tgt->io_retire_queue);
1401                 }
1402                 bnx2fc_scsi_done(io_req, DID_ERROR);
1403                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1404         }
1405 }
1406
1407 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1408 {
1409         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1410         struct bnx2fc_rport *tgt = io_req->tgt;
1411         struct list_head *list;
1412         struct list_head *tmp;
1413         struct bnx2fc_cmd *cmd;
1414         int tm_lun = sc_cmd->device->lun;
1415         int rc = 0;
1416         int lun;
1417
1418         /* called with tgt_lock held */
1419         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1420         /*
1421          * Walk thru the active_ios queue and ABORT the IO
1422          * that matches with the LUN that was reset
1423          */
1424         list_for_each_safe(list, tmp, &tgt->active_cmd_queue) {
1425                 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1426                 cmd = (struct bnx2fc_cmd *)list;
1427                 lun = cmd->sc_cmd->device->lun;
1428                 if (lun == tm_lun) {
1429                         /* Initiate ABTS on this cmd */
1430                         if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1431                                               &cmd->req_flags)) {
1432                                 /* cancel the IO timeout */
1433                                 if (cancel_delayed_work(&io_req->timeout_work))
1434                                         kref_put(&io_req->refcount,
1435                                                  bnx2fc_cmd_release);
1436                                                         /* timer hold */
1437                                 rc = bnx2fc_initiate_abts(cmd);
1438                                 /* abts shouldn't fail in this context */
1439                                 WARN_ON(rc != SUCCESS);
1440                         } else
1441                                 printk(KERN_ERR PFX "lun_rst: abts already in"
1442                                         " progress for this IO 0x%x\n",
1443                                         cmd->xid);
1444                 }
1445         }
1446 }
1447
1448 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1449 {
1450         struct bnx2fc_rport *tgt = io_req->tgt;
1451         struct list_head *list;
1452         struct list_head *tmp;
1453         struct bnx2fc_cmd *cmd;
1454         int rc = 0;
1455
1456         /* called with tgt_lock held */
1457         BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1458         /*
1459          * Walk thru the active_ios queue and ABORT the IO
1460          * that matches with the LUN that was reset
1461          */
1462         list_for_each_safe(list, tmp, &tgt->active_cmd_queue) {
1463                 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1464                 cmd = (struct bnx2fc_cmd *)list;
1465                 /* Initiate ABTS */
1466                 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1467                                                         &cmd->req_flags)) {
1468                         /* cancel the IO timeout */
1469                         if (cancel_delayed_work(&io_req->timeout_work))
1470                                 kref_put(&io_req->refcount,
1471                                          bnx2fc_cmd_release); /* timer hold */
1472                         rc = bnx2fc_initiate_abts(cmd);
1473                         /* abts shouldn't fail in this context */
1474                         WARN_ON(rc != SUCCESS);
1475
1476                 } else
1477                         printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1478                                 " for this IO 0x%x\n", cmd->xid);
1479         }
1480 }
1481
1482 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1483                              struct fcoe_task_ctx_entry *task, u8 num_rq)
1484 {
1485         struct bnx2fc_mp_req *tm_req;
1486         struct fc_frame_header *fc_hdr;
1487         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1488         u64 *hdr;
1489         u64 *temp_hdr;
1490         void *rsp_buf;
1491
1492         /* Called with tgt_lock held */
1493         BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1494
1495         if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1496                 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1497         else {
1498                 /* TM has already timed out and we got
1499                  * delayed completion. Ignore completion
1500                  * processing.
1501                  */
1502                 return;
1503         }
1504
1505         tm_req = &(io_req->mp_req);
1506         fc_hdr = &(tm_req->resp_fc_hdr);
1507         hdr = (u64 *)fc_hdr;
1508         temp_hdr = (u64 *)
1509                 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1510         hdr[0] = cpu_to_be64(temp_hdr[0]);
1511         hdr[1] = cpu_to_be64(temp_hdr[1]);
1512         hdr[2] = cpu_to_be64(temp_hdr[2]);
1513
1514         tm_req->resp_len =
1515                 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1516
1517         rsp_buf = tm_req->resp_buf;
1518
1519         if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1520                 bnx2fc_parse_fcp_rsp(io_req,
1521                                      (struct fcoe_fcp_rsp_payload *)
1522                                      rsp_buf, num_rq);
1523                 if (io_req->fcp_rsp_code == 0) {
1524                         /* TM successful */
1525                         if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1526                                 bnx2fc_lun_reset_cmpl(io_req);
1527                         else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1528                                 bnx2fc_tgt_reset_cmpl(io_req);
1529                 }
1530         } else {
1531                 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1532                         fc_hdr->fh_r_ctl);
1533         }
1534         if (!sc_cmd->SCp.ptr) {
1535                 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1536                 return;
1537         }
1538         switch (io_req->fcp_status) {
1539         case FC_GOOD:
1540                 if (io_req->cdb_status == 0) {
1541                         /* Good IO completion */
1542                         sc_cmd->result = DID_OK << 16;
1543                 } else {
1544                         /* Transport status is good, SCSI status not good */
1545                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1546                 }
1547                 if (io_req->fcp_resid)
1548                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1549                 break;
1550
1551         default:
1552                 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1553                            io_req->fcp_status);
1554                 break;
1555         }
1556
1557         sc_cmd = io_req->sc_cmd;
1558         io_req->sc_cmd = NULL;
1559
1560         /* check if the io_req exists in tgt's tmf_q */
1561         if (io_req->on_tmf_queue) {
1562
1563                 list_del_init(&io_req->link);
1564                 io_req->on_tmf_queue = 0;
1565         } else {
1566
1567                 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1568                 return;
1569         }
1570
1571         sc_cmd->SCp.ptr = NULL;
1572         sc_cmd->scsi_done(sc_cmd);
1573
1574         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1575         if (io_req->wait_for_comp) {
1576                 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1577                 complete(&io_req->tm_done);
1578         }
1579 }
1580
1581 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1582                            int bd_index)
1583 {
1584         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1585         int frag_size, sg_frags;
1586
1587         sg_frags = 0;
1588         while (sg_len) {
1589                 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1590                         frag_size = BNX2FC_BD_SPLIT_SZ;
1591                 else
1592                         frag_size = sg_len;
1593                 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1594                 bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
1595                 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1596                 bd[bd_index + sg_frags].flags = 0;
1597
1598                 addr += (u64) frag_size;
1599                 sg_frags++;
1600                 sg_len -= frag_size;
1601         }
1602         return sg_frags;
1603
1604 }
1605
1606 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1607 {
1608         struct bnx2fc_interface *interface = io_req->port->priv;
1609         struct bnx2fc_hba *hba = interface->hba;
1610         struct scsi_cmnd *sc = io_req->sc_cmd;
1611         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1612         struct scatterlist *sg;
1613         int byte_count = 0;
1614         int sg_count = 0;
1615         int bd_count = 0;
1616         int sg_frags;
1617         unsigned int sg_len;
1618         u64 addr;
1619         int i;
1620
1621         sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1622                               scsi_sg_count(sc), sc->sc_data_direction);
1623         scsi_for_each_sg(sc, sg, sg_count, i) {
1624                 sg_len = sg_dma_len(sg);
1625                 addr = sg_dma_address(sg);
1626                 if (sg_len > BNX2FC_MAX_BD_LEN) {
1627                         sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1628                                                    bd_count);
1629                 } else {
1630
1631                         sg_frags = 1;
1632                         bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1633                         bd[bd_count].buf_addr_hi  = addr >> 32;
1634                         bd[bd_count].buf_len = (u16)sg_len;
1635                         bd[bd_count].flags = 0;
1636                 }
1637                 bd_count += sg_frags;
1638                 byte_count += sg_len;
1639         }
1640         if (byte_count != scsi_bufflen(sc))
1641                 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1642                         "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1643                         io_req->xid);
1644         return bd_count;
1645 }
1646
1647 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1648 {
1649         struct scsi_cmnd *sc = io_req->sc_cmd;
1650         struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1651         int bd_count;
1652
1653         if (scsi_sg_count(sc)) {
1654                 bd_count = bnx2fc_map_sg(io_req);
1655                 if (bd_count == 0)
1656                         return -ENOMEM;
1657         } else {
1658                 bd_count = 0;
1659                 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1660                 bd[0].buf_len = bd[0].flags = 0;
1661         }
1662         io_req->bd_tbl->bd_valid = bd_count;
1663
1664         return 0;
1665 }
1666
1667 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1668 {
1669         struct scsi_cmnd *sc = io_req->sc_cmd;
1670
1671         if (io_req->bd_tbl->bd_valid && sc) {
1672                 scsi_dma_unmap(sc);
1673                 io_req->bd_tbl->bd_valid = 0;
1674         }
1675 }
1676
1677 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1678                                   struct fcp_cmnd *fcp_cmnd)
1679 {
1680         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1681         char tag[2];
1682
1683         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1684
1685         int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1686
1687         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1688         memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1689
1690         fcp_cmnd->fc_cmdref = 0;
1691         fcp_cmnd->fc_pri_ta = 0;
1692         fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1693         fcp_cmnd->fc_flags = io_req->io_req_flags;
1694
1695         if (scsi_populate_tag_msg(sc_cmd, tag)) {
1696                 switch (tag[0]) {
1697                 case HEAD_OF_QUEUE_TAG:
1698                         fcp_cmnd->fc_pri_ta = FCP_PTA_HEADQ;
1699                         break;
1700                 case ORDERED_QUEUE_TAG:
1701                         fcp_cmnd->fc_pri_ta = FCP_PTA_ORDERED;
1702                         break;
1703                 default:
1704                         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1705                         break;
1706                 }
1707         } else {
1708                 fcp_cmnd->fc_pri_ta = 0;
1709         }
1710 }
1711
1712 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1713                                  struct fcoe_fcp_rsp_payload *fcp_rsp,
1714                                  u8 num_rq)
1715 {
1716         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1717         struct bnx2fc_rport *tgt = io_req->tgt;
1718         u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1719         u32 rq_buff_len = 0;
1720         int i;
1721         unsigned char *rq_data;
1722         unsigned char *dummy;
1723         int fcp_sns_len = 0;
1724         int fcp_rsp_len = 0;
1725
1726         io_req->fcp_status = FC_GOOD;
1727         io_req->fcp_resid = fcp_rsp->fcp_resid;
1728
1729         io_req->scsi_comp_flags = rsp_flags;
1730         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1731                                 fcp_rsp->scsi_status_code;
1732
1733         /* Fetch fcp_rsp_info and fcp_sns_info if available */
1734         if (num_rq) {
1735
1736                 /*
1737                  * We do not anticipate num_rq >1, as the linux defined
1738                  * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1739                  * 256 bytes of single rq buffer is good enough to hold this.
1740                  */
1741
1742                 if (rsp_flags &
1743                     FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1744                         fcp_rsp_len = rq_buff_len
1745                                         = fcp_rsp->fcp_rsp_len;
1746                 }
1747
1748                 if (rsp_flags &
1749                     FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1750                         fcp_sns_len = fcp_rsp->fcp_sns_len;
1751                         rq_buff_len += fcp_rsp->fcp_sns_len;
1752                 }
1753
1754                 io_req->fcp_rsp_len = fcp_rsp_len;
1755                 io_req->fcp_sns_len = fcp_sns_len;
1756
1757                 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1758                         /* Invalid sense sense length. */
1759                         printk(KERN_ERR PFX "invalid sns length %d\n",
1760                                 rq_buff_len);
1761                         /* reset rq_buff_len */
1762                         rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
1763                 }
1764
1765                 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1766
1767                 if (num_rq > 1) {
1768                         /* We do not need extra sense data */
1769                         for (i = 1; i < num_rq; i++)
1770                                 dummy = bnx2fc_get_next_rqe(tgt, 1);
1771                 }
1772
1773                 /* fetch fcp_rsp_code */
1774                 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1775                         /* Only for task management function */
1776                         io_req->fcp_rsp_code = rq_data[3];
1777                         printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
1778                                 io_req->fcp_rsp_code);
1779                 }
1780
1781                 /* fetch sense data */
1782                 rq_data += fcp_rsp_len;
1783
1784                 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1785                         printk(KERN_ERR PFX "Truncating sense buffer\n");
1786                         fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1787                 }
1788
1789                 memset(sc_cmd->sense_buffer, 0, sizeof(sc_cmd->sense_buffer));
1790                 if (fcp_sns_len)
1791                         memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1792
1793                 /* return RQ entries */
1794                 for (i = 0; i < num_rq; i++)
1795                         bnx2fc_return_rqe(tgt, 1);
1796         }
1797 }
1798
1799 /**
1800  * bnx2fc_queuecommand - Queuecommand function of the scsi template
1801  *
1802  * @host:       The Scsi_Host the command was issued to
1803  * @sc_cmd:     struct scsi_cmnd to be executed
1804  *
1805  * This is the IO strategy routine, called by SCSI-ML
1806  **/
1807 int bnx2fc_queuecommand(struct Scsi_Host *host,
1808                         struct scsi_cmnd *sc_cmd)
1809 {
1810         struct fc_lport *lport = shost_priv(host);
1811         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1812         struct fc_rport_libfc_priv *rp = rport->dd_data;
1813         struct bnx2fc_rport *tgt;
1814         struct bnx2fc_cmd *io_req;
1815         int rc = 0;
1816         int rval;
1817
1818         rval = fc_remote_port_chkready(rport);
1819         if (rval) {
1820                 sc_cmd->result = rval;
1821                 sc_cmd->scsi_done(sc_cmd);
1822                 return 0;
1823         }
1824
1825         if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1826                 rc = SCSI_MLQUEUE_HOST_BUSY;
1827                 goto exit_qcmd;
1828         }
1829
1830         /* rport and tgt are allocated together, so tgt should be non-NULL */
1831         tgt = (struct bnx2fc_rport *)&rp[1];
1832
1833         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1834                 /*
1835                  * Session is not offloaded yet. Let SCSI-ml retry
1836                  * the command.
1837                  */
1838                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1839                 goto exit_qcmd;
1840         }
1841
1842         io_req = bnx2fc_cmd_alloc(tgt);
1843         if (!io_req) {
1844                 rc = SCSI_MLQUEUE_HOST_BUSY;
1845                 goto exit_qcmd;
1846         }
1847         io_req->sc_cmd = sc_cmd;
1848
1849         if (bnx2fc_post_io_req(tgt, io_req)) {
1850                 printk(KERN_ERR PFX "Unable to post io_req\n");
1851                 rc = SCSI_MLQUEUE_HOST_BUSY;
1852                 goto exit_qcmd;
1853         }
1854 exit_qcmd:
1855         return rc;
1856 }
1857
1858 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1859                                    struct fcoe_task_ctx_entry *task,
1860                                    u8 num_rq)
1861 {
1862         struct fcoe_fcp_rsp_payload *fcp_rsp;
1863         struct bnx2fc_rport *tgt = io_req->tgt;
1864         struct scsi_cmnd *sc_cmd;
1865         struct Scsi_Host *host;
1866
1867
1868         /* scsi_cmd_cmpl is called with tgt lock held */
1869
1870         if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1871                 /* we will not receive ABTS response for this IO */
1872                 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1873                            "this scsi cmd\n");
1874         }
1875
1876         /* Cancel the timeout_work, as we received IO completion */
1877         if (cancel_delayed_work(&io_req->timeout_work))
1878                 kref_put(&io_req->refcount,
1879                          bnx2fc_cmd_release); /* drop timer hold */
1880
1881         sc_cmd = io_req->sc_cmd;
1882         if (sc_cmd == NULL) {
1883                 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1884                 return;
1885         }
1886
1887         /* Fetch fcp_rsp from task context and perform cmd completion */
1888         fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1889                    &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1890
1891         /* parse fcp_rsp and obtain sense data from RQ if available */
1892         bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1893
1894         host = sc_cmd->device->host;
1895         if (!sc_cmd->SCp.ptr) {
1896                 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1897                 return;
1898         }
1899
1900         if (io_req->on_active_queue) {
1901                 list_del_init(&io_req->link);
1902                 io_req->on_active_queue = 0;
1903                 /* Move IO req to retire queue */
1904                 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1905         } else {
1906                 /* This should not happen, but could have been pulled
1907                  * by bnx2fc_flush_active_ios(), or during a race
1908                  * between command abort and (late) completion.
1909                  */
1910                 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1911                 if (io_req->wait_for_comp)
1912                         if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1913                                                &io_req->req_flags))
1914                                 complete(&io_req->tm_done);
1915         }
1916
1917         bnx2fc_unmap_sg_list(io_req);
1918         io_req->sc_cmd = NULL;
1919
1920         switch (io_req->fcp_status) {
1921         case FC_GOOD:
1922                 if (io_req->cdb_status == 0) {
1923                         /* Good IO completion */
1924                         sc_cmd->result = DID_OK << 16;
1925                 } else {
1926                         /* Transport status is good, SCSI status not good */
1927                         BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1928                                  " fcp_resid = 0x%x\n",
1929                                 io_req->cdb_status, io_req->fcp_resid);
1930                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1931                 }
1932                 if (io_req->fcp_resid)
1933                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1934                 break;
1935         default:
1936                 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1937                         io_req->fcp_status);
1938                 break;
1939         }
1940         sc_cmd->SCp.ptr = NULL;
1941         sc_cmd->scsi_done(sc_cmd);
1942         kref_put(&io_req->refcount, bnx2fc_cmd_release);
1943 }
1944
1945 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1946                                struct bnx2fc_cmd *io_req)
1947 {
1948         struct fcoe_task_ctx_entry *task;
1949         struct fcoe_task_ctx_entry *task_page;
1950         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1951         struct fcoe_port *port = tgt->port;
1952         struct bnx2fc_interface *interface = port->priv;
1953         struct bnx2fc_hba *hba = interface->hba;
1954         struct fc_lport *lport = port->lport;
1955         struct fcoe_dev_stats *stats;
1956         int task_idx, index;
1957         u16 xid;
1958
1959         /* Initialize rest of io_req fields */
1960         io_req->cmd_type = BNX2FC_SCSI_CMD;
1961         io_req->port = port;
1962         io_req->tgt = tgt;
1963         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1964         sc_cmd->SCp.ptr = (char *)io_req;
1965
1966         stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1967         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1968                 io_req->io_req_flags = BNX2FC_READ;
1969                 stats->InputRequests++;
1970                 stats->InputBytes += io_req->data_xfer_len;
1971         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1972                 io_req->io_req_flags = BNX2FC_WRITE;
1973                 stats->OutputRequests++;
1974                 stats->OutputBytes += io_req->data_xfer_len;
1975         } else {
1976                 io_req->io_req_flags = 0;
1977                 stats->ControlRequests++;
1978         }
1979         put_cpu();
1980
1981         xid = io_req->xid;
1982
1983         /* Build buffer descriptor list for firmware from sg list */
1984         if (bnx2fc_build_bd_list_from_sg(io_req)) {
1985                 printk(KERN_ERR PFX "BD list creation failed\n");
1986                 spin_lock_bh(&tgt->tgt_lock);
1987                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1988                 spin_unlock_bh(&tgt->tgt_lock);
1989                 return -EAGAIN;
1990         }
1991
1992         task_idx = xid / BNX2FC_TASKS_PER_PAGE;
1993         index = xid % BNX2FC_TASKS_PER_PAGE;
1994
1995         /* Initialize task context for this IO request */
1996         task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
1997         task = &(task_page[index]);
1998         bnx2fc_init_task(io_req, task);
1999
2000         spin_lock_bh(&tgt->tgt_lock);
2001
2002         if (tgt->flush_in_prog) {
2003                 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2004                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2005                 spin_unlock_bh(&tgt->tgt_lock);
2006                 return -EAGAIN;
2007         }
2008
2009         if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2010                 printk(KERN_ERR PFX "Session not ready...post_io\n");
2011                 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2012                 spin_unlock_bh(&tgt->tgt_lock);
2013                 return -EAGAIN;
2014         }
2015
2016         /* Time IO req */
2017         if (tgt->io_timeout)
2018                 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2019         /* Obtain free SQ entry */
2020         bnx2fc_add_2_sq(tgt, xid);
2021
2022         /* Enqueue the io_req to active_cmd_queue */
2023
2024         io_req->on_active_queue = 1;
2025         /* move io_req from pending_queue to active_queue */
2026         list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2027
2028         /* Ring doorbell */
2029         bnx2fc_ring_doorbell(tgt);
2030         spin_unlock_bh(&tgt->tgt_lock);
2031         return 0;
2032 }