summaryrefslogtreecommitdiff
path: root/drivers/scsi/bnx2fc/bnx2fc_els.c
blob: bdbbb13b8534c2318464b1b9a803c554af2b17ac (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
/*
 * bnx2fc_els.c: Broadcom NetXtreme II Linux FCoE offload driver.
 * This file contains helper routines that handle ELS requests
 * and responses.
 *
 * Copyright (c) 2008 - 2011 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
 */

#include "bnx2fc.h"

static void bnx2fc_logo_resp(struct fc_seq *seq, struct fc_frame *fp,
			     void *arg);
static void bnx2fc_flogi_resp(struct fc_seq *seq, struct fc_frame *fp,
			      void *arg);
static int bnx2fc_initiate_els(struct bnx2fc_rport *tgt, unsigned int op,
			void *data, u32 data_len,
			void (*cb_func)(struct bnx2fc_els_cb_arg *cb_arg),
			struct bnx2fc_els_cb_arg *cb_arg, u32 timer_msec);

static void bnx2fc_rrq_compl(struct bnx2fc_els_cb_arg *cb_arg)
{
	struct bnx2fc_cmd *orig_io_req;
	struct bnx2fc_cmd *rrq_req;
	int rc = 0;

	BUG_ON(!cb_arg);
	rrq_req = cb_arg->io_req;
	orig_io_req = cb_arg->aborted_io_req;
	BUG_ON(!orig_io_req);
	BNX2FC_ELS_DBG("rrq_compl: orig xid = 0x%x, rrq_xid = 0x%x\n",
		   orig_io_req->xid, rrq_req->xid);

	kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);

	if (test_and_clear_bit(BNX2FC_FLAG_ELS_TIMEOUT, &rrq_req->req_flags)) {
		/*
		 * els req is timed out. cleanup the IO with FW and
		 * drop the completion. Remove from active_cmd_queue.
		 */
		BNX2FC_ELS_DBG("rrq xid - 0x%x timed out, clean it up\n",
			   rrq_req->xid);

		if (rrq_req->on_active_queue) {
			list_del_init(&rrq_req->link);
			rrq_req->on_active_queue = 0;
			rc = bnx2fc_initiate_cleanup(rrq_req);
			BUG_ON(rc);
		}
	}
	kfree(cb_arg);
}
int bnx2fc_send_rrq(struct bnx2fc_cmd *aborted_io_req)
{

	struct fc_els_rrq rrq;
	struct bnx2fc_rport *tgt = aborted_io_req->tgt;
	struct fc_lport *lport = tgt->rdata->local_port;
	struct bnx2fc_els_cb_arg *cb_arg = NULL;
	u32 sid = tgt->sid;
	u32 r_a_tov = lport->r_a_tov;
	unsigned long start = jiffies;
	int rc;

	BNX2FC_ELS_DBG("Sending RRQ orig_xid = 0x%x\n",
		   aborted_io_req->xid);
	memset(&rrq, 0, sizeof(rrq));

	cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_NOIO);
	if (!cb_arg) {
		printk(KERN_ERR PFX "Unable to allocate cb_arg for RRQ\n");
		rc = -ENOMEM;
		goto rrq_err;
	}

	cb_arg->aborted_io_req = aborted_io_req;

	rrq.rrq_cmd = ELS_RRQ;
	hton24(rrq.rrq_s_id, sid);
	rrq.rrq_ox_id = htons(aborted_io_req->xid);
	rrq.rrq_rx_id = htons(aborted_io_req->task->rxwr_txrd.var_ctx.rx_id);

retry_rrq:
	rc = bnx2fc_initiate_els(tgt, ELS_RRQ, &rrq, sizeof(rrq),
				 bnx2fc_rrq_compl, cb_arg,
				 r_a_tov);
	if (rc == -ENOMEM) {
		if (time_after(jiffies, start + (10 * HZ))) {
			BNX2FC_ELS_DBG("rrq Failed\n");
			rc = FAILED;
			goto rrq_err;
		}
		msleep(20);
		goto retry_rrq;
	}
rrq_err:
	if (rc) {
		BNX2FC_ELS_DBG("RRQ failed - release orig io req 0x%x\n",
			aborted_io_req->xid);
		kfree(cb_arg);
		spin_lock_bh(&tgt->tgt_lock);
		kref_put(&aborted_io_req->refcount, bnx2fc_cmd_release);
		spin_unlock_bh(&tgt->tgt_lock);
	}
	return rc;
}

static void bnx2fc_l2_els_compl(struct bnx2fc_els_cb_arg *cb_arg)
{
	struct bnx2fc_cmd *els_req;
	struct bnx2fc_rport *tgt;
	struct bnx2fc_mp_req *mp_req;
	struct fc_frame_header *fc_hdr;
	unsigned char *buf;
	void *resp_buf;
	u32 resp_len, hdr_len;
	u16 l2_oxid;
	int frame_len;
	int rc = 0;

	l2_oxid = cb_arg->l2_oxid;
	BNX2FC_ELS_DBG("ELS COMPL - l2_oxid = 0x%x\n", l2_oxid);

	els_req = cb_arg->io_req;
	if (test_and_clear_bit(BNX2FC_FLAG_ELS_TIMEOUT, &els_req->req_flags)) {
		/*
		 * els req is timed out. cleanup the IO with FW and
		 * drop the completion. libfc will handle the els timeout
		 */
		if (els_req->on_active_queue) {
			list_del_init(&els_req->link);
			els_req->on_active_queue = 0;
			rc = bnx2fc_initiate_cleanup(els_req);
			BUG_ON(rc);
		}
		goto free_arg;
	}

	tgt = els_req->tgt;
	mp_req = &(els_req->mp_req);
	fc_hdr = &(mp_req->resp_fc_hdr);
	resp_len = mp_req->resp_len;
	resp_buf = mp_req->resp_buf;

	buf = kzalloc(PAGE_SIZE, GFP_ATOMIC);
	if (!buf) {
		printk(KERN_ERR PFX "Unable to alloc mp buf\n");
		goto free_arg;
	}
	hdr_len = sizeof(*fc_hdr);
	if (hdr_len + resp_len > PAGE_SIZE) {
		printk(KERN_ERR PFX "l2_els_compl: resp len is "
				    "beyond page size\n");
		goto free_buf;
	}
	memcpy(buf, fc_hdr, hdr_len);
	memcpy(buf + hdr_len, resp_buf, resp_len);
	frame_len = hdr_len + resp_len;

	bnx2fc_process_l2_frame_compl(tgt, buf, frame_len, l2_oxid);

free_buf:
	kfree(buf);
free_arg:
	kfree(cb_arg);
}

int bnx2fc_send_adisc(struct bnx2fc_rport *tgt, struct fc_frame *fp)
{
	struct fc_els_adisc *adisc;
	struct fc_frame_header *fh;
	struct bnx2fc_els_cb_arg *cb_arg;
	struct fc_lport *lport = tgt->rdata->local_port;
	u32 r_a_tov = lport->r_a_tov;
	int rc;

	fh = fc_frame_header_get(fp);
	cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
	if (!cb_arg) {
		printk(KERN_ERR PFX "Unable to allocate cb_arg for ADISC\n");
		return -ENOMEM;
	}

	cb_arg->l2_oxid = ntohs(fh->fh_ox_id);

	BNX2FC_ELS_DBG("send ADISC: l2_oxid = 0x%x\n", cb_arg->l2_oxid);
	adisc = fc_frame_payload_get(fp, sizeof(*adisc));
	/* adisc is initialized by libfc */
	rc = bnx2fc_initiate_els(tgt, ELS_ADISC, adisc, sizeof(*adisc),
				 bnx2fc_l2_els_compl, cb_arg, 2 * r_a_tov);
	if (rc)
		kfree(cb_arg);
	return rc;
}

int bnx2fc_send_logo(struct bnx2fc_rport *tgt, struct fc_frame *fp)
{
	struct fc_els_logo *logo;
	struct fc_frame_header *fh;
	struct bnx2fc_els_cb_arg *cb_arg;
	struct fc_lport *lport = tgt->rdata->local_port;
	u32 r_a_tov = lport->r_a_tov;
	int rc;

	fh = fc_frame_header_get(fp);
	cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
	if (!cb_arg) {
		printk(KERN_ERR PFX "Unable to allocate cb_arg for LOGO\n");
		return -ENOMEM;
	}

	cb_arg->l2_oxid = ntohs(fh->fh_ox_id);

	BNX2FC_ELS_DBG("Send LOGO: l2_oxid = 0x%x\n", cb_arg->l2_oxid);
	logo = fc_frame_payload_get(fp, sizeof(*logo));
	/* logo is initialized by libfc */
	rc = bnx2fc_initiate_els(tgt, ELS_LOGO, logo, sizeof(*logo),
				 bnx2fc_l2_els_compl, cb_arg, 2 * r_a_tov);
	if (rc)
		kfree(cb_arg);
	return rc;
}

int bnx2fc_send_rls(struct bnx2fc_rport *tgt, struct fc_frame *fp)
{
	struct fc_els_rls *rls;
	struct fc_frame_header *fh;
	struct bnx2fc_els_cb_arg *cb_arg;
	struct fc_lport *lport = tgt->rdata->local_port;
	u32 r_a_tov = lport->r_a_tov;
	int rc;

	fh = fc_frame_header_get(fp);
	cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
	if (!cb_arg) {
		printk(KERN_ERR PFX "Unable to allocate cb_arg for LOGO\n");
		return -ENOMEM;
	}

	cb_arg->l2_oxid = ntohs(fh->fh_ox_id);

	rls = fc_frame_payload_get(fp, sizeof(*rls));
	/* rls is initialized by libfc */
	rc = bnx2fc_initiate_els(tgt, ELS_RLS, rls, sizeof(*rls),
				  bnx2fc_l2_els_compl, cb_arg, 2 * r_a_tov);
	if (rc)
		kfree(cb_arg);
	return rc;
}

void bnx2fc_srr_compl(struct bnx2fc_els_cb_arg *cb_arg)
{
	struct bnx2fc_mp_req *mp_req;
	struct fc_frame_header *fc_hdr, *fh;
	struct bnx2fc_cmd *srr_req;
	struct bnx2fc_cmd *orig_io_req;
	struct fc_frame *fp;
	unsigned char *buf;
	void *resp_buf;
	u32 resp_len, hdr_len;
	u8 opcode;
	int rc = 0;

	orig_io_req = cb_arg->aborted_io_req;
	srr_req = cb_arg->io_req;
	if (test_and_clear_bit(BNX2FC_FLAG_ELS_TIMEOUT, &srr_req->req_flags)) {
		/* SRR timedout */
		BNX2FC_IO_DBG(srr_req, "srr timed out, abort "
		       "orig_io - 0x%x\n",
			orig_io_req->xid);
		rc = bnx2fc_initiate_abts(srr_req);
		if (rc != SUCCESS) {
			BNX2FC_IO_DBG(srr_req, "srr_compl: initiate_abts "
				"failed. issue cleanup\n");
			bnx2fc_initiate_cleanup(srr_req);
		}
		if (test_bit(BNX2FC_FLAG_IO_COMPL, &orig_io_req->req_flags) ||
		    test_bit(BNX2FC_FLAG_ISSUE_ABTS, &orig_io_req->req_flags)) {
			BNX2FC_IO_DBG(srr_req, "srr_compl:xid 0x%x flags = %lx",
				      orig_io_req->xid, orig_io_req->req_flags);
			goto srr_compl_done;
		}
		orig_io_req->srr_retry++;
		if (orig_io_req->srr_retry <= SRR_RETRY_COUNT) {
			struct bnx2fc_rport *tgt = orig_io_req->tgt;
			spin_unlock_bh(&tgt->tgt_lock);
			rc = bnx2fc_send_srr(orig_io_req,
					     orig_io_req->srr_offset,
					     orig_io_req->srr_rctl);
			spin_lock_bh(&tgt->tgt_lock);
			if (!rc)
				goto srr_compl_done;
		}

		rc = bnx2fc_initiate_abts(orig_io_req);
		if (rc != SUCCESS) {
			BNX2FC_IO_DBG(srr_req, "srr_compl: initiate_abts "
				"failed xid = 0x%x. issue cleanup\n",
				orig_io_req->xid);
			bnx2fc_initiate_cleanup(orig_io_req);
		}
		goto srr_compl_done;
	}
	if (test_bit(BNX2FC_FLAG_IO_COMPL, &orig_io_req->req_flags) ||
	    test_bit(BNX2FC_FLAG_ISSUE_ABTS, &orig_io_req->req_flags)) {
		BNX2FC_IO_DBG(srr_req, "srr_compl:xid - 0x%x flags = %lx",
			      orig_io_req->xid, orig_io_req->req_flags);
		goto srr_compl_done;
	}
	mp_req = &(srr_req->mp_req);
	fc_hdr = &(mp_req->resp_fc_hdr);
	resp_len = mp_req->resp_len;
	resp_buf = mp_req->resp_buf;

	hdr_len = sizeof(*fc_hdr);
	buf = kzalloc(PAGE_SIZE, GFP_ATOMIC);
	if (!buf) {
		printk(KERN_ERR PFX "srr buf: mem alloc failure\n");
		goto srr_compl_done;
	}
	memcpy(buf, fc_hdr, hdr_len);
	memcpy(buf + hdr_len, resp_buf, resp_len);

	fp = fc_frame_alloc(NULL, resp_len);
	if (!fp) {
		printk(KERN_ERR PFX "fc_frame_alloc failure\n");
		goto free_buf;
	}

	fh = (struct fc_frame_header *) fc_frame_header_get(fp);
	/* Copy FC Frame header and payload into the frame */
	memcpy(fh, buf, hdr_len + resp_len);

	opcode = fc_frame_payload_op(fp);
	switch (opcode) {
	case ELS_LS_ACC:
		BNX2FC_IO_DBG(srr_req, "SRR success\n");
		break;
	case ELS_LS_RJT:
		BNX2FC_IO_DBG(srr_req, "SRR rejected\n");
		rc = bnx2fc_initiate_abts(orig_io_req);
		if (rc != SUCCESS) {
			BNX2FC_IO_DBG(srr_req, "srr_compl: initiate_abts "
				"failed xid = 0x%x. issue cleanup\n",
				orig_io_req->xid);
			bnx2fc_initiate_cleanup(orig_io_req);
		}
		break;
	default:
		BNX2FC_IO_DBG(srr_req, "srr compl - invalid opcode = %d\n",
			opcode);
		break;
	}
	fc_frame_free(fp);
free_buf:
	kfree(buf);
srr_compl_done:
	kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
}

void bnx2fc_rec_compl(struct bnx2fc_els_cb_arg *cb_arg)
{
	struct bnx2fc_cmd *orig_io_req, *new_io_req;
	struct bnx2fc_cmd *rec_req;
	struct bnx2fc_mp_req *mp_req;
	struct fc_frame_header *fc_hdr, *fh;
	struct fc_els_ls_rjt *rjt;
	struct fc_els_rec_acc *acc;
	struct bnx2fc_rport *tgt;
	struct fcoe_err_report_entry *err_entry;
	struct scsi_cmnd *sc_cmd;
	enum fc_rctl r_ctl;
	unsigned char *buf;
	void *resp_buf;
	struct fc_frame *fp;
	u8 opcode;
	u32 offset;
	u32 e_stat;
	u32 resp_len, hdr_len;
	int rc = 0;
	bool send_seq_clnp = false;
	bool abort_io = false;

	BNX2FC_MISC_DBG("Entered rec_compl callback\n");
	rec_req = cb_arg->io_req;
	orig_io_req = cb_arg->aborted_io_req;
	BNX2FC_IO_DBG(rec_req, "rec_compl: orig xid = 0x%x", orig_io_req->xid);
	tgt = orig_io_req->tgt;

	/* Handle REC timeout case */
	if (test_and_clear_bit(BNX2FC_FLAG_ELS_TIMEOUT, &rec_req->req_flags)) {
		BNX2FC_IO_DBG(rec_req, "timed out, abort "
		       "orig_io - 0x%x\n",
			orig_io_req->xid);
		/* els req is timed out. send abts for els */
		rc = bnx2fc_initiate_abts(rec_req);
		if (rc != SUCCESS) {
			BNX2FC_IO_DBG(rec_req, "rec_compl: initiate_abts "
				"failed. issue cleanup\n");
			bnx2fc_initiate_cleanup(rec_req);
		}
		orig_io_req->rec_retry++;
		/* REC timedout. send ABTS to the orig IO req */
		if (orig_io_req->rec_retry <= REC_RETRY_COUNT) {
			spin_unlock_bh(&tgt->tgt_lock);
			rc = bnx2fc_send_rec(orig_io_req);
			spin_lock_bh(&tgt->tgt_lock);
			if (!rc)
				goto rec_compl_done;
		}
		rc = bnx2fc_initiate_abts(orig_io_req);
		if (rc != SUCCESS) {
			BNX2FC_IO_DBG(rec_req, "rec_compl: initiate_abts "
				"failed xid = 0x%x. issue cleanup\n",
				orig_io_req->xid);
			bnx2fc_initiate_cleanup(orig_io_req);
		}
		goto rec_compl_done;
	}

	if (test_bit(BNX2FC_FLAG_IO_COMPL, &orig_io_req->req_flags)) {
		BNX2FC_IO_DBG(rec_req, "completed"
		       "orig_io - 0x%x\n",
			orig_io_req->xid);
		goto rec_compl_done;
	}
	if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &orig_io_req->req_flags)) {
		BNX2FC_IO_DBG(rec_req, "abts in prog "
		       "orig_io - 0x%x\n",
			orig_io_req->xid);
		goto rec_compl_done;
	}

	mp_req = &(rec_req->mp_req);
	fc_hdr = &(mp_req->resp_fc_hdr);
	resp_len = mp_req->resp_len;
	acc = resp_buf = mp_req->resp_buf;

	hdr_len = sizeof(*fc_hdr);

	buf = kzalloc(PAGE_SIZE, GFP_ATOMIC);
	if (!buf) {
		printk(KERN_ERR PFX "rec buf: mem alloc failure\n");
		goto rec_compl_done;
	}
	memcpy(buf, fc_hdr, hdr_len);
	memcpy(buf + hdr_len, resp_buf, resp_len);

	fp = fc_frame_alloc(NULL, resp_len);
	if (!fp) {
		printk(KERN_ERR PFX "fc_frame_alloc failure\n");
		goto free_buf;
	}

	fh = (struct fc_frame_header *) fc_frame_header_get(fp);
	/* Copy FC Frame header and payload into the frame */
	memcpy(fh, buf, hdr_len + resp_len);

	opcode = fc_frame_payload_op(fp);
	if (opcode == ELS_LS_RJT) {
		BNX2FC_IO_DBG(rec_req, "opcode is RJT\n");
		rjt = fc_frame_payload_get(fp, sizeof(*rjt));
		if ((rjt->er_reason == ELS_RJT_LOGIC ||
		    rjt->er_reason == ELS_RJT_UNAB) &&
		    rjt->er_explan == ELS_EXPL_OXID_RXID) {
			BNX2FC_IO_DBG(rec_req, "handle CMD LOST case\n");
			new_io_req = bnx2fc_cmd_alloc(tgt);
			if (!new_io_req)
				goto abort_io;
			new_io_req->sc_cmd = orig_io_req->sc_cmd;
			/* cleanup orig_io_req that is with the FW */
			set_bit(BNX2FC_FLAG_CMD_LOST,
				&orig_io_req->req_flags);
			bnx2fc_initiate_cleanup(orig_io_req);
			/* Post a new IO req with the same sc_cmd */
			BNX2FC_IO_DBG(rec_req, "Post IO request again\n");
			spin_unlock_bh(&tgt->tgt_lock);
			rc = bnx2fc_post_io_req(tgt, new_io_req);
			spin_lock_bh(&tgt->tgt_lock);
			if (!rc)
				goto free_frame;
			BNX2FC_IO_DBG(rec_req, "REC: io post err\n");
		}
abort_io:
		rc = bnx2fc_initiate_abts(orig_io_req);
		if (rc != SUCCESS) {
			BNX2FC_IO_DBG(rec_req, "rec_compl: initiate_abts "
				"failed. issue cleanup\n");
			bnx2fc_initiate_cleanup(orig_io_req);
		}
	} else if (opcode == ELS_LS_ACC) {
		/* REVISIT: Check if the exchange is already aborted */
		offset = ntohl(acc->reca_fc4value);
		e_stat = ntohl(acc->reca_e_stat);
		if (e_stat & ESB_ST_SEQ_INIT)  {
			BNX2FC_IO_DBG(rec_req, "target has the seq init\n");
			goto free_frame;
		}
		BNX2FC_IO_DBG(rec_req, "e_stat = 0x%x, offset = 0x%x\n",
			e_stat, offset);
		/* Seq initiative is with us */
		err_entry = (struct fcoe_err_report_entry *)
			     &orig_io_req->err_entry;
		sc_cmd = orig_io_req->sc_cmd;
		if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
			/* SCSI WRITE command */
			if (offset == orig_io_req->data_xfer_len) {
				BNX2FC_IO_DBG(rec_req, "WRITE - resp lost\n");
				/* FCP_RSP lost */
				r_ctl = FC_RCTL_DD_CMD_STATUS;
				offset = 0;
			} else  {
				/* start transmitting from offset */
				BNX2FC_IO_DBG(rec_req, "XFER_RDY/DATA lost\n");
				send_seq_clnp = true;
				r_ctl = FC_RCTL_DD_DATA_DESC;
				if (bnx2fc_initiate_seq_cleanup(orig_io_req,
								offset, r_ctl))
					abort_io = true;
				/* XFER_RDY */
			}
		} else {
			/* SCSI READ command */
			if (err_entry->data.rx_buf_off ==
					orig_io_req->data_xfer_len) {
				/* FCP_RSP lost */
				BNX2FC_IO_DBG(rec_req, "READ - resp lost\n");
				r_ctl = FC_RCTL_DD_CMD_STATUS;
				offset = 0;
			} else  {
				/* request retransmission from this offset */
				send_seq_clnp = true;
				offset = err_entry->data.rx_buf_off;
				BNX2FC_IO_DBG(rec_req, "RD DATA lost\n");
				/* FCP_DATA lost */
				r_ctl = FC_RCTL_DD_SOL_DATA;
				if (bnx2fc_initiate_seq_cleanup(orig_io_req,
								offset, r_ctl))
					abort_io = true;
			}
		}
		if (abort_io) {
			rc = bnx2fc_initiate_abts(orig_io_req);
			if (rc != SUCCESS) {
				BNX2FC_IO_DBG(rec_req, "rec_compl:initiate_abts"
					      " failed. issue cleanup\n");
				bnx2fc_initiate_cleanup(orig_io_req);
			}
		} else if (!send_seq_clnp) {
			BNX2FC_IO_DBG(rec_req, "Send SRR - FCP_RSP\n");
			spin_unlock_bh(&tgt->tgt_lock);
			rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
			spin_lock_bh(&tgt->tgt_lock);

			if (rc) {
				BNX2FC_IO_DBG(rec_req, "Unable to send SRR"
					" IO will abort\n");
			}
		}
	}
free_frame:
	fc_frame_free(fp);
free_buf:
	kfree(buf);
rec_compl_done:
	kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
	kfree(cb_arg);
}

int bnx2fc_send_rec(struct bnx2fc_cmd *orig_io_req)
{
	struct fc_els_rec rec;
	struct bnx2fc_rport *tgt = orig_io_req->tgt;
	struct fc_lport *lport = tgt->rdata->local_port;
	struct bnx2fc_els_cb_arg *cb_arg = NULL;
	u32 sid = tgt->sid;
	u32 r_a_tov = lport->r_a_tov;
	int rc;

	BNX2FC_IO_DBG(orig_io_req, "Sending REC\n");
	memset(&rec, 0, sizeof(rec));

	cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
	if (!cb_arg) {
		printk(KERN_ERR PFX "Unable to allocate cb_arg for REC\n");
		rc = -ENOMEM;
		goto rec_err;
	}
	kref_get(&orig_io_req->refcount);

	cb_arg->aborted_io_req = orig_io_req;

	rec.rec_cmd = ELS_REC;
	hton24(rec.rec_s_id, sid);
	rec.rec_ox_id = htons(orig_io_req->xid);
	rec.rec_rx_id = htons(orig_io_req->task->rxwr_txrd.var_ctx.rx_id);

	rc = bnx2fc_initiate_els(tgt, ELS_REC, &rec, sizeof(rec),
				 bnx2fc_rec_compl, cb_arg,
				 r_a_tov);
rec_err:
	if (rc) {
		BNX2FC_IO_DBG(orig_io_req, "REC failed - release\n");
		spin_lock_bh(&tgt->tgt_lock);
		kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
		spin_unlock_bh(&tgt->tgt_lock);
		kfree(cb_arg);
	}
	return rc;
}

int bnx2fc_send_srr(struct bnx2fc_cmd *orig_io_req, u32 offset, u8 r_ctl)
{
	struct fcp_srr srr;
	struct bnx2fc_rport *tgt = orig_io_req->tgt;
	struct fc_lport *lport = tgt->rdata->local_port;
	struct bnx2fc_els_cb_arg *cb_arg = NULL;
	u32 r_a_tov = lport->r_a_tov;
	int rc;

	BNX2FC_IO_DBG(orig_io_req, "Sending SRR\n");
	memset(&srr, 0, sizeof(srr));

	cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
	if (!cb_arg) {
		printk(KERN_ERR PFX "Unable to allocate cb_arg for SRR\n");
		rc = -ENOMEM;
		goto srr_err;
	}
	kref_get(&orig_io_req->refcount);

	cb_arg->aborted_io_req = orig_io_req;

	srr.srr_op = ELS_SRR;
	srr.srr_ox_id = htons(orig_io_req->xid);
	srr.srr_rx_id = htons(orig_io_req->task->rxwr_txrd.var_ctx.rx_id);
	srr.srr_rel_off = htonl(offset);
	srr.srr_r_ctl = r_ctl;
	orig_io_req->srr_offset = offset;
	orig_io_req->srr_rctl = r_ctl;

	rc = bnx2fc_initiate_els(tgt, ELS_SRR, &srr, sizeof(srr),
				 bnx2fc_srr_compl, cb_arg,
				 r_a_tov);
srr_err:
	if (rc) {
		BNX2FC_IO_DBG(orig_io_req, "SRR failed - release\n");
		spin_lock_bh(&tgt->tgt_lock);
		kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
		spin_unlock_bh(&tgt->tgt_lock);
		kfree(cb_arg);
	} else
		set_bit(BNX2FC_FLAG_SRR_SENT, &orig_io_req->req_flags);

	return rc;
}

static int bnx2fc_initiate_els(struct bnx2fc_rport *tgt, unsigned int op,
			void *data, u32 data_len,
			void (*cb_func)(struct bnx2fc_els_cb_arg *cb_arg),
			struct bnx2fc_els_cb_arg *cb_arg, u32 timer_msec)
{
	struct fcoe_port *port = tgt->port;
	struct bnx2fc_interface *interface = port->priv;
	struct fc_rport *rport = tgt->rport;
	struct fc_lport *lport = port->lport;
	struct bnx2fc_cmd *els_req;
	struct bnx2fc_mp_req *mp_req;
	struct fc_frame_header *fc_hdr;
	struct fcoe_task_ctx_entry *task;
	struct fcoe_task_ctx_entry *task_page;
	int rc = 0;
	int task_idx, index;
	u32 did, sid;
	u16 xid;

	rc = fc_remote_port_chkready(rport);
	if (rc) {
		printk(KERN_ERR PFX "els 0x%x: rport not ready\n", op);
		rc = -EINVAL;
		goto els_err;
	}
	if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
		printk(KERN_ERR PFX "els 0x%x: link is not ready\n", op);
		rc = -EINVAL;
		goto els_err;
	}
	if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) ||
	     (test_bit(BNX2FC_FLAG_EXPL_LOGO, &tgt->flags))) {
		printk(KERN_ERR PFX "els 0x%x: tgt not ready\n", op);
		rc = -EINVAL;
		goto els_err;
	}
	els_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ELS);
	if (!els_req) {
		rc = -ENOMEM;
		goto els_err;
	}

	els_req->sc_cmd = NULL;
	els_req->port = port;
	els_req->tgt = tgt;
	els_req->cb_func = cb_func;
	cb_arg->io_req = els_req;
	els_req->cb_arg = cb_arg;

	mp_req = (struct bnx2fc_mp_req *)&(els_req->mp_req);
	rc = bnx2fc_init_mp_req(els_req);
	if (rc == FAILED) {
		printk(KERN_ERR PFX "ELS MP request init failed\n");
		spin_lock_bh(&tgt->tgt_lock);
		kref_put(&els_req->refcount, bnx2fc_cmd_release);
		spin_unlock_bh(&tgt->tgt_lock);
		rc = -ENOMEM;
		goto els_err;
	} else {
		/* rc SUCCESS */
		rc = 0;
	}

	/* Set the data_xfer_len to the size of ELS payload */
	mp_req->req_len = data_len;
	els_req->data_xfer_len = mp_req->req_len;

	/* Fill ELS Payload */
	if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS)) {
		memcpy(mp_req->req_buf, data, data_len);
	} else {
		printk(KERN_ERR PFX "Invalid ELS op 0x%x\n", op);
		els_req->cb_func = NULL;
		els_req->cb_arg = NULL;
		spin_lock_bh(&tgt->tgt_lock);
		kref_put(&els_req->refcount, bnx2fc_cmd_release);
		spin_unlock_bh(&tgt->tgt_lock);
		rc = -EINVAL;
	}

	if (rc)
		goto els_err;

	/* Fill FC header */
	fc_hdr = &(mp_req->req_fc_hdr);

	did = tgt->rport->port_id;
	sid = tgt->sid;

	if (op == ELS_SRR)
		__fc_fill_fc_hdr(fc_hdr, FC_RCTL_ELS4_REQ, did, sid,
				   FC_TYPE_FCP, FC_FC_FIRST_SEQ |
				   FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
	else
		__fc_fill_fc_hdr(fc_hdr, FC_RCTL_ELS_REQ, did, sid,
				   FC_TYPE_ELS, FC_FC_FIRST_SEQ |
				   FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);

	/* Obtain exchange id */
	xid = els_req->xid;
	task_idx = xid/BNX2FC_TASKS_PER_PAGE;
	index = xid % BNX2FC_TASKS_PER_PAGE;

	/* Initialize task context for this IO request */
	task_page = (struct fcoe_task_ctx_entry *)
			interface->hba->task_ctx[task_idx];
	task = &(task_page[index]);
	bnx2fc_init_mp_task(els_req, task);

	spin_lock_bh(&tgt->tgt_lock);

	if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
		printk(KERN_ERR PFX "initiate_els.. session not ready\n");
		els_req->cb_func = NULL;
		els_req->cb_arg = NULL;
		kref_put(&els_req->refcount, bnx2fc_cmd_release);
		spin_unlock_bh(&tgt->tgt_lock);
		return -EINVAL;
	}

	if (timer_msec)
		bnx2fc_cmd_timer_set(els_req, timer_msec);
	bnx2fc_add_2_sq(tgt, xid);

	els_req->on_active_queue = 1;
	list_add_tail(&els_req->link, &tgt->els_queue);

	/* Ring doorbell */
	bnx2fc_ring_doorbell(tgt);
	spin_unlock_bh(&tgt->tgt_lock);

els_err:
	return rc;
}

void bnx2fc_process_els_compl(struct bnx2fc_cmd *els_req,
			      struct fcoe_task_ctx_entry *task, u8 num_rq)
{
	struct bnx2fc_mp_req *mp_req;
	struct fc_frame_header *fc_hdr;
	u64 *hdr;
	u64 *temp_hdr;

	BNX2FC_ELS_DBG("Entered process_els_compl xid = 0x%x"
			"cmd_type = %d\n", els_req->xid, els_req->cmd_type);

	if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
			     &els_req->req_flags)) {
		BNX2FC_ELS_DBG("Timer context finished processing this "
			   "els - 0x%x\n", els_req->xid);
		/* This IO doesn't receive cleanup completion */
		kref_put(&els_req->refcount, bnx2fc_cmd_release);
		return;
	}

	/* Cancel the timeout_work, as we received the response */
	if (cancel_delayed_work(&els_req->timeout_work))
		kref_put(&els_req->refcount,
			 bnx2fc_cmd_release); /* drop timer hold */

	if (els_req->on_active_queue) {
		list_del_init(&els_req->link);
		els_req->on_active_queue = 0;
	}

	mp_req = &(els_req->mp_req);
	fc_hdr = &(mp_req->resp_fc_hdr);

	hdr = (u64 *)fc_hdr;
	temp_hdr = (u64 *)
		&task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
	hdr[0] = cpu_to_be64(temp_hdr[0]);
	hdr[1] = cpu_to_be64(temp_hdr[1]);
	hdr[2] = cpu_to_be64(temp_hdr[2]);

	mp_req->resp_len =
		task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;

	/* Parse ELS response */
	if ((els_req->cb_func) && (els_req->cb_arg)) {
		els_req->cb_func(els_req->cb_arg);
		els_req->cb_arg = NULL;
	}

	kref_put(&els_req->refcount, bnx2fc_cmd_release);
}

static void bnx2fc_flogi_resp(struct fc_seq *seq, struct fc_frame *fp,
			      void *arg)
{
	struct fcoe_ctlr *fip = arg;
	struct fc_exch *exch = fc_seq_exch(seq);
	struct fc_lport *lport = exch->lp;
	u8 *mac;
	u8 op;

	if (IS_ERR(fp))
		goto done;

	mac = fr_cb(fp)->granted_mac;
	if (is_zero_ether_addr(mac)) {
		op = fc_frame_payload_op(fp);
		if (lport->vport) {
			if (op == ELS_LS_RJT) {
				printk(KERN_ERR PFX "bnx2fc_flogi_resp is LS_RJT\n");
				fc_vport_terminate(lport->vport);
				fc_frame_free(fp);
				return;
			}
		}
		fcoe_ctlr_recv_flogi(fip, lport, fp);
	}
	if (!is_zero_ether_addr(mac))
		fip->update_mac(lport, mac);
done:
	fc_lport_flogi_resp(seq, fp, lport);
}

static void bnx2fc_logo_resp(struct fc_seq *seq, struct fc_frame *fp,
			     void *arg)
{
	struct fcoe_ctlr *fip = arg;
	struct fc_exch *exch = fc_seq_exch(seq);
	struct fc_lport *lport = exch->lp;
	static u8 zero_mac[ETH_ALEN] = { 0 };

	if (!IS_ERR(fp))
		fip->update_mac(lport, zero_mac);
	fc_lport_logo_resp(seq, fp, lport);
}

struct fc_seq *bnx2fc_elsct_send(struct fc_lport *lport, u32 did,
				      struct fc_frame *fp, unsigned int op,
				      void (*resp)(struct fc_seq *,
						   struct fc_frame *,
						   void *),
				      void *arg, u32 timeout)
{
	struct fcoe_port *port = lport_priv(lport);
	struct bnx2fc_interface *interface = port->priv;
	struct fcoe_ctlr *fip = bnx2fc_to_ctlr(interface);
	struct fc_frame_header *fh = fc_frame_header_get(fp);

	switch (op) {
	case ELS_FLOGI:
	case ELS_FDISC:
		return fc_elsct_send(lport, did, fp, op, bnx2fc_flogi_resp,
				     fip, timeout);
	case ELS_LOGO:
		/* only hook onto fabric logouts, not port logouts */
		if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
			break;
		return fc_elsct_send(lport, did, fp, op, bnx2fc_logo_resp,
				     fip, timeout);
	}
	return fc_elsct_send(lport, did, fp, op, resp, arg, timeout);
}