summaryrefslogtreecommitdiff
path: root/drivers/scsi/qedf/qedf_els.c
blob: aa22b11436ba9deac6286f3b27c5ed956770e72e (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
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
/*
 *  QLogic FCoE Offload Driver
 *  Copyright (c) 2016-2017 Cavium Inc.
 *
 *  This software is available under the terms of the GNU General Public License
 *  (GPL) Version 2, available from the file COPYING in the main directory of
 *  this source tree.
 */
#include "qedf.h"

/* It's assumed that the lock is held when calling this function. */
static int qedf_initiate_els(struct qedf_rport *fcport, unsigned int op,
	void *data, uint32_t data_len,
	void (*cb_func)(struct qedf_els_cb_arg *cb_arg),
	struct qedf_els_cb_arg *cb_arg, uint32_t timer_msec)
{
	struct qedf_ctx *qedf = fcport->qedf;
	struct fc_lport *lport = qedf->lport;
	struct qedf_ioreq *els_req;
	struct qedf_mp_req *mp_req;
	struct fc_frame_header *fc_hdr;
	struct e4_fcoe_task_context *task;
	int rc = 0;
	uint32_t did, sid;
	uint16_t xid;
	uint32_t start_time = jiffies / HZ;
	uint32_t current_time;
	struct fcoe_wqe *sqe;
	unsigned long flags;
	u16 sqe_idx;

	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Sending ELS\n");

	rc = fc_remote_port_chkready(fcport->rport);
	if (rc) {
		QEDF_ERR(&(qedf->dbg_ctx), "els 0x%x: rport not ready\n", op);
		rc = -EAGAIN;
		goto els_err;
	}
	if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
		QEDF_ERR(&(qedf->dbg_ctx), "els 0x%x: link is not ready\n",
			  op);
		rc = -EAGAIN;
		goto els_err;
	}

	if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
		QEDF_ERR(&(qedf->dbg_ctx), "els 0x%x: fcport not ready\n", op);
		rc = -EINVAL;
		goto els_err;
	}

retry_els:
	els_req = qedf_alloc_cmd(fcport, QEDF_ELS);
	if (!els_req) {
		current_time = jiffies / HZ;
		if ((current_time - start_time) > 10) {
			QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
				   "els: Failed els 0x%x\n", op);
			rc = -ENOMEM;
			goto els_err;
		}
		mdelay(20 * USEC_PER_MSEC);
		goto retry_els;
	}

	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "initiate_els els_req = "
		   "0x%p cb_arg = %p xid = %x\n", els_req, cb_arg,
		   els_req->xid);
	els_req->sc_cmd = NULL;
	els_req->cmd_type = QEDF_ELS;
	els_req->fcport = fcport;
	els_req->cb_func = cb_func;
	cb_arg->io_req = els_req;
	cb_arg->op = op;
	els_req->cb_arg = cb_arg;
	els_req->data_xfer_len = data_len;

	/* Record which cpu this request is associated with */
	els_req->cpu = smp_processor_id();

	mp_req = (struct qedf_mp_req *)&(els_req->mp_req);
	rc = qedf_init_mp_req(els_req);
	if (rc) {
		QEDF_ERR(&(qedf->dbg_ctx), "ELS MP request init failed\n");
		kref_put(&els_req->refcount, qedf_release_cmd);
		goto els_err;
	} else {
		rc = 0;
	}

	/* Fill ELS Payload */
	if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS)) {
		memcpy(mp_req->req_buf, data, data_len);
	} else {
		QEDF_ERR(&(qedf->dbg_ctx), "Invalid ELS op 0x%x\n", op);
		els_req->cb_func = NULL;
		els_req->cb_arg = NULL;
		kref_put(&els_req->refcount, qedf_release_cmd);
		rc = -EINVAL;
	}

	if (rc)
		goto els_err;

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

	did = fcport->rdata->ids.port_id;
	sid = fcport->sid;

	__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;

	spin_lock_irqsave(&fcport->rport_lock, flags);

	sqe_idx = qedf_get_sqe_idx(fcport);
	sqe = &fcport->sq[sqe_idx];
	memset(sqe, 0, sizeof(struct fcoe_wqe));

	/* Initialize task context for this IO request */
	task = qedf_get_task_mem(&qedf->tasks, xid);
	qedf_init_mp_task(els_req, task, sqe);

	/* Put timer on original I/O request */
	if (timer_msec)
		qedf_cmd_timer_set(qedf, els_req, timer_msec);

	/* Ring doorbell */
	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Ringing doorbell for ELS "
		   "req\n");
	qedf_ring_doorbell(fcport);
	spin_unlock_irqrestore(&fcport->rport_lock, flags);
els_err:
	return rc;
}

void qedf_process_els_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
	struct qedf_ioreq *els_req)
{
	struct fcoe_task_context *task_ctx;
	struct scsi_cmnd *sc_cmd;
	uint16_t xid;
	struct fcoe_cqe_midpath_info *mp_info;

	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Entered with xid = 0x%x"
		   " cmd_type = %d.\n", els_req->xid, els_req->cmd_type);

	/* Kill the ELS timer */
	cancel_delayed_work(&els_req->timeout_work);

	xid = els_req->xid;
	task_ctx = qedf_get_task_mem(&qedf->tasks, xid);
	sc_cmd = els_req->sc_cmd;

	/* Get ELS response length from CQE */
	mp_info = &cqe->cqe_info.midpath_info;
	els_req->mp_req.resp_len = mp_info->data_placement_size;

	/* 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, qedf_release_cmd);
}

static void qedf_rrq_compl(struct qedf_els_cb_arg *cb_arg)
{
	struct qedf_ioreq *orig_io_req;
	struct qedf_ioreq *rrq_req;
	struct qedf_ctx *qedf;
	int refcount;

	rrq_req = cb_arg->io_req;
	qedf = rrq_req->fcport->qedf;

	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Entered.\n");

	orig_io_req = cb_arg->aborted_io_req;

	if (!orig_io_req)
		goto out_free;

	if (rrq_req->event != QEDF_IOREQ_EV_ELS_TMO &&
	    rrq_req->event != QEDF_IOREQ_EV_ELS_ERR_DETECT)
		cancel_delayed_work_sync(&orig_io_req->timeout_work);

	refcount = kref_read(&orig_io_req->refcount);
	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "rrq_compl: orig io = %p,"
		   " orig xid = 0x%x, rrq_xid = 0x%x, refcount=%d\n",
		   orig_io_req, orig_io_req->xid, rrq_req->xid, refcount);

	/* This should return the aborted io_req to the command pool */
	if (orig_io_req)
		kref_put(&orig_io_req->refcount, qedf_release_cmd);

out_free:
	kfree(cb_arg);
}

/* Assumes kref is already held by caller */
int qedf_send_rrq(struct qedf_ioreq *aborted_io_req)
{

	struct fc_els_rrq rrq;
	struct qedf_rport *fcport;
	struct fc_lport *lport;
	struct qedf_els_cb_arg *cb_arg = NULL;
	struct qedf_ctx *qedf;
	uint32_t sid;
	uint32_t r_a_tov;
	int rc;

	if (!aborted_io_req) {
		QEDF_ERR(NULL, "abort_io_req is NULL.\n");
		return -EINVAL;
	}

	fcport = aborted_io_req->fcport;

	/* Check that fcport is still offloaded */
	if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
		QEDF_ERR(NULL, "fcport is no longer offloaded.\n");
		return -EINVAL;
	}

	if (!fcport->qedf) {
		QEDF_ERR(NULL, "fcport->qedf is NULL.\n");
		return -EINVAL;
	}

	qedf = fcport->qedf;
	lport = qedf->lport;
	sid = fcport->sid;
	r_a_tov = lport->r_a_tov;

	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Sending RRQ orig "
		   "io = %p, orig_xid = 0x%x\n", aborted_io_req,
		   aborted_io_req->xid);
	memset(&rrq, 0, sizeof(rrq));

	cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
	if (!cb_arg) {
		QEDF_ERR(&(qedf->dbg_ctx), "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->tstorm_st_context.read_write.rx_id);

	rc = qedf_initiate_els(fcport, ELS_RRQ, &rrq, sizeof(rrq),
	    qedf_rrq_compl, cb_arg, r_a_tov);

rrq_err:
	if (rc) {
		QEDF_ERR(&(qedf->dbg_ctx), "RRQ failed - release orig io "
			  "req 0x%x\n", aborted_io_req->xid);
		kfree(cb_arg);
		kref_put(&aborted_io_req->refcount, qedf_release_cmd);
	}
	return rc;
}

static void qedf_process_l2_frame_compl(struct qedf_rport *fcport,
					struct fc_frame *fp,
					u16 l2_oxid)
{
	struct fc_lport *lport = fcport->qedf->lport;
	struct fc_frame_header *fh;
	u32 crc;

	fh = (struct fc_frame_header *)fc_frame_header_get(fp);

	/* Set the OXID we return to what libfc used */
	if (l2_oxid != FC_XID_UNKNOWN)
		fh->fh_ox_id = htons(l2_oxid);

	/* Setup header fields */
	fh->fh_r_ctl = FC_RCTL_ELS_REP;
	fh->fh_type = FC_TYPE_ELS;
	/* Last sequence, end sequence */
	fh->fh_f_ctl[0] = 0x98;
	hton24(fh->fh_d_id, lport->port_id);
	hton24(fh->fh_s_id, fcport->rdata->ids.port_id);
	fh->fh_rx_id = 0xffff;

	/* Set frame attributes */
	crc = fcoe_fc_crc(fp);
	fc_frame_init(fp);
	fr_dev(fp) = lport;
	fr_sof(fp) = FC_SOF_I3;
	fr_eof(fp) = FC_EOF_T;
	fr_crc(fp) = cpu_to_le32(~crc);

	/* Send completed request to libfc */
	fc_exch_recv(lport, fp);
}

/*
 * In instances where an ELS command times out we may need to restart the
 * rport by logging out and then logging back in.
 */
void qedf_restart_rport(struct qedf_rport *fcport)
{
	struct fc_lport *lport;
	struct fc_rport_priv *rdata;
	u32 port_id;

	if (!fcport)
		return;

	rdata = fcport->rdata;
	if (rdata) {
		lport = fcport->qedf->lport;
		port_id = rdata->ids.port_id;
		QEDF_ERR(&(fcport->qedf->dbg_ctx),
		    "LOGO port_id=%x.\n", port_id);
		fc_rport_logoff(rdata);
		/* Recreate the rport and log back in */
		rdata = fc_rport_create(lport, port_id);
		if (rdata)
			fc_rport_login(rdata);
	}
}

static void qedf_l2_els_compl(struct qedf_els_cb_arg *cb_arg)
{
	struct qedf_ioreq *els_req;
	struct qedf_rport *fcport;
	struct qedf_mp_req *mp_req;
	struct fc_frame *fp;
	struct fc_frame_header *fh, *mp_fc_hdr;
	void *resp_buf, *fc_payload;
	u32 resp_len;
	u16 l2_oxid;

	l2_oxid = cb_arg->l2_oxid;
	els_req = cb_arg->io_req;

	if (!els_req) {
		QEDF_ERR(NULL, "els_req is NULL.\n");
		goto free_arg;
	}

	/*
	 * If we are flushing the command just free the cb_arg as none of the
	 * response data will be valid.
	 */
	if (els_req->event == QEDF_IOREQ_EV_ELS_FLUSH)
		goto free_arg;

	fcport = els_req->fcport;
	mp_req = &(els_req->mp_req);
	mp_fc_hdr = &(mp_req->resp_fc_hdr);
	resp_len = mp_req->resp_len;
	resp_buf = mp_req->resp_buf;

	/*
	 * If a middle path ELS command times out, don't try to return
	 * the command but rather do any internal cleanup and then libfc
	 * timeout the command and clean up its internal resources.
	 */
	if (els_req->event == QEDF_IOREQ_EV_ELS_TMO) {
		/*
		 * If ADISC times out, libfc will timeout the exchange and then
		 * try to send a PLOGI which will timeout since the session is
		 * still offloaded.  Force libfc to logout the session which
		 * will offload the connection and allow the PLOGI response to
		 * flow over the LL2 path.
		 */
		if (cb_arg->op == ELS_ADISC)
			qedf_restart_rport(fcport);
		return;
	}

	if (sizeof(struct fc_frame_header) + resp_len > QEDF_PAGE_SIZE) {
		QEDF_ERR(&(fcport->qedf->dbg_ctx), "resp_len is "
		   "beyond page size.\n");
		goto free_arg;
	}

	fp = fc_frame_alloc(fcport->qedf->lport, resp_len);
	if (!fp) {
		QEDF_ERR(&(fcport->qedf->dbg_ctx),
		    "fc_frame_alloc failure.\n");
		return;
	}

	/* Copy frame header from firmware into fp */
	fh = (struct fc_frame_header *)fc_frame_header_get(fp);
	memcpy(fh, mp_fc_hdr, sizeof(struct fc_frame_header));

	/* Copy payload from firmware into fp */
	fc_payload = fc_frame_payload_get(fp, resp_len);
	memcpy(fc_payload, resp_buf, resp_len);

	QEDF_INFO(&(fcport->qedf->dbg_ctx), QEDF_LOG_ELS,
	    "Completing OX_ID 0x%x back to libfc.\n", l2_oxid);
	qedf_process_l2_frame_compl(fcport, fp, l2_oxid);

free_arg:
	kfree(cb_arg);
}

int qedf_send_adisc(struct qedf_rport *fcport, struct fc_frame *fp)
{
	struct fc_els_adisc *adisc;
	struct fc_frame_header *fh;
	struct fc_lport *lport = fcport->qedf->lport;
	struct qedf_els_cb_arg *cb_arg = NULL;
	struct qedf_ctx *qedf;
	uint32_t r_a_tov = lport->r_a_tov;
	int rc;

	qedf = fcport->qedf;
	fh = fc_frame_header_get(fp);

	cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
	if (!cb_arg) {
		QEDF_ERR(&(qedf->dbg_ctx), "Unable to allocate cb_arg for "
			  "ADISC\n");
		rc = -ENOMEM;
		goto adisc_err;
	}
	cb_arg->l2_oxid = ntohs(fh->fh_ox_id);

	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
	    "Sending ADISC ox_id=0x%x.\n", cb_arg->l2_oxid);

	adisc = fc_frame_payload_get(fp, sizeof(*adisc));

	rc = qedf_initiate_els(fcport, ELS_ADISC, adisc, sizeof(*adisc),
	    qedf_l2_els_compl, cb_arg, r_a_tov);

adisc_err:
	if (rc) {
		QEDF_ERR(&(qedf->dbg_ctx), "ADISC failed.\n");
		kfree(cb_arg);
	}
	return rc;
}

static void qedf_srr_compl(struct qedf_els_cb_arg *cb_arg)
{
	struct qedf_ioreq *orig_io_req;
	struct qedf_ioreq *srr_req;
	struct qedf_mp_req *mp_req;
	struct fc_frame_header *mp_fc_hdr, *fh;
	struct fc_frame *fp;
	void *resp_buf, *fc_payload;
	u32 resp_len;
	struct fc_lport *lport;
	struct qedf_ctx *qedf;
	int refcount;
	u8 opcode;

	srr_req = cb_arg->io_req;
	qedf = srr_req->fcport->qedf;
	lport = qedf->lport;

	orig_io_req = cb_arg->aborted_io_req;

	if (!orig_io_req)
		goto out_free;

	clear_bit(QEDF_CMD_SRR_SENT, &orig_io_req->flags);

	if (srr_req->event != QEDF_IOREQ_EV_ELS_TMO &&
	    srr_req->event != QEDF_IOREQ_EV_ELS_ERR_DETECT)
		cancel_delayed_work_sync(&orig_io_req->timeout_work);

	refcount = kref_read(&orig_io_req->refcount);
	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Entered: orig_io=%p,"
		   " orig_io_xid=0x%x, rec_xid=0x%x, refcount=%d\n",
		   orig_io_req, orig_io_req->xid, srr_req->xid, refcount);

	/* If a SRR times out, simply free resources */
	if (srr_req->event == QEDF_IOREQ_EV_ELS_TMO)
		goto out_put;

	/* Normalize response data into struct fc_frame */
	mp_req = &(srr_req->mp_req);
	mp_fc_hdr = &(mp_req->resp_fc_hdr);
	resp_len = mp_req->resp_len;
	resp_buf = mp_req->resp_buf;

	fp = fc_frame_alloc(lport, resp_len);
	if (!fp) {
		QEDF_ERR(&(qedf->dbg_ctx),
		    "fc_frame_alloc failure.\n");
		goto out_put;
	}

	/* Copy frame header from firmware into fp */
	fh = (struct fc_frame_header *)fc_frame_header_get(fp);
	memcpy(fh, mp_fc_hdr, sizeof(struct fc_frame_header));

	/* Copy payload from firmware into fp */
	fc_payload = fc_frame_payload_get(fp, resp_len);
	memcpy(fc_payload, resp_buf, resp_len);

	opcode = fc_frame_payload_op(fp);
	switch (opcode) {
	case ELS_LS_ACC:
		QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
		    "SRR success.\n");
		break;
	case ELS_LS_RJT:
		QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_ELS,
		    "SRR rejected.\n");
		qedf_initiate_abts(orig_io_req, true);
		break;
	}

	fc_frame_free(fp);
out_put:
	/* Put reference for original command since SRR completed */
	kref_put(&orig_io_req->refcount, qedf_release_cmd);
out_free:
	kfree(cb_arg);
}

static int qedf_send_srr(struct qedf_ioreq *orig_io_req, u32 offset, u8 r_ctl)
{
	struct fcp_srr srr;
	struct qedf_ctx *qedf;
	struct qedf_rport *fcport;
	struct fc_lport *lport;
	struct qedf_els_cb_arg *cb_arg = NULL;
	u32 sid, r_a_tov;
	int rc;

	if (!orig_io_req) {
		QEDF_ERR(NULL, "orig_io_req is NULL.\n");
		return -EINVAL;
	}

	fcport = orig_io_req->fcport;

	/* Check that fcport is still offloaded */
	if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
		QEDF_ERR(NULL, "fcport is no longer offloaded.\n");
		return -EINVAL;
	}

	if (!fcport->qedf) {
		QEDF_ERR(NULL, "fcport->qedf is NULL.\n");
		return -EINVAL;
	}

	/* Take reference until SRR command completion */
	kref_get(&orig_io_req->refcount);

	qedf = fcport->qedf;
	lport = qedf->lport;
	sid = fcport->sid;
	r_a_tov = lport->r_a_tov;

	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Sending SRR orig_io=%p, "
		   "orig_xid=0x%x\n", orig_io_req, orig_io_req->xid);
	memset(&srr, 0, sizeof(srr));

	cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
	if (!cb_arg) {
		QEDF_ERR(&(qedf->dbg_ctx), "Unable to allocate cb_arg for "
			  "SRR\n");
		rc = -ENOMEM;
		goto srr_err;
	}

	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->rx_id);
	srr.srr_rel_off = htonl(offset);
	srr.srr_r_ctl = r_ctl;

	rc = qedf_initiate_els(fcport, ELS_SRR, &srr, sizeof(srr),
	    qedf_srr_compl, cb_arg, r_a_tov);

srr_err:
	if (rc) {
		QEDF_ERR(&(qedf->dbg_ctx), "SRR failed - release orig_io_req"
			  "=0x%x\n", orig_io_req->xid);
		kfree(cb_arg);
		/* If we fail to queue SRR, send ABTS to orig_io */
		qedf_initiate_abts(orig_io_req, true);
		kref_put(&orig_io_req->refcount, qedf_release_cmd);
	} else
		/* Tell other threads that SRR is in progress */
		set_bit(QEDF_CMD_SRR_SENT, &orig_io_req->flags);

	return rc;
}

static void qedf_initiate_seq_cleanup(struct qedf_ioreq *orig_io_req,
	u32 offset, u8 r_ctl)
{
	struct qedf_rport *fcport;
	unsigned long flags;
	struct qedf_els_cb_arg *cb_arg;
	struct fcoe_wqe *sqe;
	u16 sqe_idx;

	fcport = orig_io_req->fcport;

	QEDF_INFO(&(fcport->qedf->dbg_ctx), QEDF_LOG_ELS,
	    "Doing sequence cleanup for xid=0x%x offset=%u.\n",
	    orig_io_req->xid, offset);

	cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
	if (!cb_arg) {
		QEDF_ERR(&(fcport->qedf->dbg_ctx), "Unable to allocate cb_arg "
			  "for sequence cleanup\n");
		return;
	}

	/* Get reference for cleanup request */
	kref_get(&orig_io_req->refcount);

	orig_io_req->cmd_type = QEDF_SEQ_CLEANUP;
	cb_arg->offset = offset;
	cb_arg->r_ctl = r_ctl;
	orig_io_req->cb_arg = cb_arg;

	qedf_cmd_timer_set(fcport->qedf, orig_io_req,
	    QEDF_CLEANUP_TIMEOUT * HZ);

	spin_lock_irqsave(&fcport->rport_lock, flags);

	sqe_idx = qedf_get_sqe_idx(fcport);
	sqe = &fcport->sq[sqe_idx];
	memset(sqe, 0, sizeof(struct fcoe_wqe));
	orig_io_req->task_params->sqe = sqe;

	init_initiator_sequence_recovery_fcoe_task(orig_io_req->task_params,
						   offset);
	qedf_ring_doorbell(fcport);

	spin_unlock_irqrestore(&fcport->rport_lock, flags);
}

void qedf_process_seq_cleanup_compl(struct qedf_ctx *qedf,
	struct fcoe_cqe *cqe, struct qedf_ioreq *io_req)
{
	int rc;
	struct qedf_els_cb_arg *cb_arg;

	cb_arg = io_req->cb_arg;

	/* If we timed out just free resources */
	if (io_req->event == QEDF_IOREQ_EV_ELS_TMO || !cqe)
		goto free;

	/* Kill the timer we put on the request */
	cancel_delayed_work_sync(&io_req->timeout_work);

	rc = qedf_send_srr(io_req, cb_arg->offset, cb_arg->r_ctl);
	if (rc)
		QEDF_ERR(&(qedf->dbg_ctx), "Unable to send SRR, I/O will "
		    "abort, xid=0x%x.\n", io_req->xid);
free:
	kfree(cb_arg);
	kref_put(&io_req->refcount, qedf_release_cmd);
}

static bool qedf_requeue_io_req(struct qedf_ioreq *orig_io_req)
{
	struct qedf_rport *fcport;
	struct qedf_ioreq *new_io_req;
	unsigned long flags;
	bool rc = false;

	fcport = orig_io_req->fcport;
	if (!fcport) {
		QEDF_ERR(NULL, "fcport is NULL.\n");
		goto out;
	}

	if (!orig_io_req->sc_cmd) {
		QEDF_ERR(&(fcport->qedf->dbg_ctx), "sc_cmd is NULL for "
		    "xid=0x%x.\n", orig_io_req->xid);
		goto out;
	}

	new_io_req = qedf_alloc_cmd(fcport, QEDF_SCSI_CMD);
	if (!new_io_req) {
		QEDF_ERR(&(fcport->qedf->dbg_ctx), "Could not allocate new "
		    "io_req.\n");
		goto out;
	}

	new_io_req->sc_cmd = orig_io_req->sc_cmd;

	/*
	 * This keeps the sc_cmd struct from being returned to the tape
	 * driver and being requeued twice. We do need to put a reference
	 * for the original I/O request since we will not do a SCSI completion
	 * for it.
	 */
	orig_io_req->sc_cmd = NULL;
	kref_put(&orig_io_req->refcount, qedf_release_cmd);

	spin_lock_irqsave(&fcport->rport_lock, flags);

	/* kref for new command released in qedf_post_io_req on error */
	if (qedf_post_io_req(fcport, new_io_req)) {
		QEDF_ERR(&(fcport->qedf->dbg_ctx), "Unable to post io_req\n");
		/* Return SQE to pool */
		atomic_inc(&fcport->free_sqes);
	} else {
		QEDF_INFO(&(fcport->qedf->dbg_ctx), QEDF_LOG_ELS,
		    "Reissued SCSI command from  orig_xid=0x%x on "
		    "new_xid=0x%x.\n", orig_io_req->xid, new_io_req->xid);
		/*
		 * Abort the original I/O but do not return SCSI command as
		 * it has been reissued on another OX_ID.
		 */
		spin_unlock_irqrestore(&fcport->rport_lock, flags);
		qedf_initiate_abts(orig_io_req, false);
		goto out;
	}

	spin_unlock_irqrestore(&fcport->rport_lock, flags);
out:
	return rc;
}


static void qedf_rec_compl(struct qedf_els_cb_arg *cb_arg)
{
	struct qedf_ioreq *orig_io_req;
	struct qedf_ioreq *rec_req;
	struct qedf_mp_req *mp_req;
	struct fc_frame_header *mp_fc_hdr, *fh;
	struct fc_frame *fp;
	void *resp_buf, *fc_payload;
	u32 resp_len;
	struct fc_lport *lport;
	struct qedf_ctx *qedf;
	int refcount;
	enum fc_rctl r_ctl;
	struct fc_els_ls_rjt *rjt;
	struct fc_els_rec_acc *acc;
	u8 opcode;
	u32 offset, e_stat;
	struct scsi_cmnd *sc_cmd;
	bool srr_needed = false;

	rec_req = cb_arg->io_req;
	qedf = rec_req->fcport->qedf;
	lport = qedf->lport;

	orig_io_req = cb_arg->aborted_io_req;

	if (!orig_io_req)
		goto out_free;

	if (rec_req->event != QEDF_IOREQ_EV_ELS_TMO &&
	    rec_req->event != QEDF_IOREQ_EV_ELS_ERR_DETECT)
		cancel_delayed_work_sync(&orig_io_req->timeout_work);

	refcount = kref_read(&orig_io_req->refcount);
	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Entered: orig_io=%p,"
		   " orig_io_xid=0x%x, rec_xid=0x%x, refcount=%d\n",
		   orig_io_req, orig_io_req->xid, rec_req->xid, refcount);

	/* If a REC times out, free resources */
	if (rec_req->event == QEDF_IOREQ_EV_ELS_TMO)
		goto out_put;

	/* Normalize response data into struct fc_frame */
	mp_req = &(rec_req->mp_req);
	mp_fc_hdr = &(mp_req->resp_fc_hdr);
	resp_len = mp_req->resp_len;
	acc = resp_buf = mp_req->resp_buf;

	fp = fc_frame_alloc(lport, resp_len);
	if (!fp) {
		QEDF_ERR(&(qedf->dbg_ctx),
		    "fc_frame_alloc failure.\n");
		goto out_put;
	}

	/* Copy frame header from firmware into fp */
	fh = (struct fc_frame_header *)fc_frame_header_get(fp);
	memcpy(fh, mp_fc_hdr, sizeof(struct fc_frame_header));

	/* Copy payload from firmware into fp */
	fc_payload = fc_frame_payload_get(fp, resp_len);
	memcpy(fc_payload, resp_buf, resp_len);

	opcode = fc_frame_payload_op(fp);
	if (opcode == ELS_LS_RJT) {
		rjt = fc_frame_payload_get(fp, sizeof(*rjt));
		QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
		    "Received LS_RJT for REC: er_reason=0x%x, "
		    "er_explan=0x%x.\n", rjt->er_reason, rjt->er_explan);
		/*
		 * The following response(s) mean that we need to reissue the
		 * request on another exchange.  We need to do this without
		 * informing the upper layers lest it cause an application
		 * error.
		 */
		if ((rjt->er_reason == ELS_RJT_LOGIC ||
		    rjt->er_reason == ELS_RJT_UNAB) &&
		    rjt->er_explan == ELS_EXPL_OXID_RXID) {
			QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
			    "Handle CMD LOST case.\n");
			qedf_requeue_io_req(orig_io_req);
		}
	} else if (opcode == ELS_LS_ACC) {
		offset = ntohl(acc->reca_fc4value);
		e_stat = ntohl(acc->reca_e_stat);
		QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
		    "Received LS_ACC for REC: offset=0x%x, e_stat=0x%x.\n",
		    offset, e_stat);
		if (e_stat & ESB_ST_SEQ_INIT)  {
			QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
			    "Target has the seq init\n");
			goto out_free_frame;
		}
		sc_cmd = orig_io_req->sc_cmd;
		if (!sc_cmd) {
			QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
			    "sc_cmd is NULL for xid=0x%x.\n",
			    orig_io_req->xid);
			goto out_free_frame;
		}
		/* SCSI write case */
		if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
			if (offset == orig_io_req->data_xfer_len) {
				QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
				    "WRITE - response lost.\n");
				r_ctl = FC_RCTL_DD_CMD_STATUS;
				srr_needed = true;
				offset = 0;
			} else {
				QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
				    "WRITE - XFER_RDY/DATA lost.\n");
				r_ctl = FC_RCTL_DD_DATA_DESC;
				/* Use data from warning CQE instead of REC */
				offset = orig_io_req->tx_buf_off;
			}
		/* SCSI read case */
		} else {
			if (orig_io_req->rx_buf_off ==
			    orig_io_req->data_xfer_len) {
				QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
				    "READ - response lost.\n");
				srr_needed = true;
				r_ctl = FC_RCTL_DD_CMD_STATUS;
				offset = 0;
			} else {
				QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
				    "READ - DATA lost.\n");
				/*
				 * For read case we always set the offset to 0
				 * for sequence recovery task.
				 */
				offset = 0;
				r_ctl = FC_RCTL_DD_SOL_DATA;
			}
		}

		if (srr_needed)
			qedf_send_srr(orig_io_req, offset, r_ctl);
		else
			qedf_initiate_seq_cleanup(orig_io_req, offset, r_ctl);
	}

out_free_frame:
	fc_frame_free(fp);
out_put:
	/* Put reference for original command since REC completed */
	kref_put(&orig_io_req->refcount, qedf_release_cmd);
out_free:
	kfree(cb_arg);
}

/* Assumes kref is already held by caller */
int qedf_send_rec(struct qedf_ioreq *orig_io_req)
{

	struct fc_els_rec rec;
	struct qedf_rport *fcport;
	struct fc_lport *lport;
	struct qedf_els_cb_arg *cb_arg = NULL;
	struct qedf_ctx *qedf;
	uint32_t sid;
	uint32_t r_a_tov;
	int rc;

	if (!orig_io_req) {
		QEDF_ERR(NULL, "orig_io_req is NULL.\n");
		return -EINVAL;
	}

	fcport = orig_io_req->fcport;

	/* Check that fcport is still offloaded */
	if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
		QEDF_ERR(NULL, "fcport is no longer offloaded.\n");
		return -EINVAL;
	}

	if (!fcport->qedf) {
		QEDF_ERR(NULL, "fcport->qedf is NULL.\n");
		return -EINVAL;
	}

	/* Take reference until REC command completion */
	kref_get(&orig_io_req->refcount);

	qedf = fcport->qedf;
	lport = qedf->lport;
	sid = fcport->sid;
	r_a_tov = lport->r_a_tov;

	memset(&rec, 0, sizeof(rec));

	cb_arg = kzalloc(sizeof(struct qedf_els_cb_arg), GFP_NOIO);
	if (!cb_arg) {
		QEDF_ERR(&(qedf->dbg_ctx), "Unable to allocate cb_arg for "
			  "REC\n");
		rc = -ENOMEM;
		goto rec_err;
	}

	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->tstorm_st_context.read_write.rx_id);

	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Sending REC orig_io=%p, "
	   "orig_xid=0x%x rx_id=0x%x\n", orig_io_req,
	   orig_io_req->xid, rec.rec_rx_id);
	rc = qedf_initiate_els(fcport, ELS_REC, &rec, sizeof(rec),
	    qedf_rec_compl, cb_arg, r_a_tov);

rec_err:
	if (rc) {
		QEDF_ERR(&(qedf->dbg_ctx), "REC failed - release orig_io_req"
			  "=0x%x\n", orig_io_req->xid);
		kfree(cb_arg);
		kref_put(&orig_io_req->refcount, qedf_release_cmd);
	}
	return rc;
}