summaryrefslogtreecommitdiff
path: root/drivers/scsi/elx/libefc/efc_fabric.c
blob: 3270ce40196c6f5ba6f7f6f36400de179f672470 (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
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2021 Broadcom. All Rights Reserved. The term
 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
 */

/*
 * This file implements remote node state machines for:
 * - Fabric logins.
 * - Fabric controller events.
 * - Name/directory services interaction.
 * - Point-to-point logins.
 */

/*
 * fabric_sm Node State Machine: Fabric States
 * ns_sm Node State Machine: Name/Directory Services States
 * p2p_sm Node State Machine: Point-to-Point Node States
 */

#include "efc.h"

static void
efc_fabric_initiate_shutdown(struct efc_node *node)
{
	struct efc *efc = node->efc;

	node->els_io_enabled = false;

	if (node->attached) {
		int rc;

		/* issue hw node free; don't care if succeeds right away
		 * or sometime later, will check node->attached later in
		 * shutdown process
		 */
		rc = efc_cmd_node_detach(efc, &node->rnode);
		if (rc < 0) {
			node_printf(node, "Failed freeing HW node, rc=%d\n",
				    rc);
		}
	}
	/*
	 * node has either been detached or is in the process of being detached,
	 * call common node's initiate cleanup function
	 */
	efc_node_initiate_cleanup(node);
}

static void
__efc_fabric_common(const char *funcname, struct efc_sm_ctx *ctx,
		    enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = NULL;

	node = ctx->app;

	switch (evt) {
	case EFC_EVT_DOMAIN_ATTACH_OK:
		break;
	case EFC_EVT_SHUTDOWN:
		node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
		efc_fabric_initiate_shutdown(node);
		break;

	default:
		/* call default event handler common to all nodes */
		__efc_node_common(funcname, ctx, evt, arg);
	}
}

void
__efc_fabric_init(struct efc_sm_ctx *ctx, enum efc_sm_event evt,
		  void *arg)
{
	struct efc_node *node = ctx->app;
	struct efc *efc = node->efc;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_REENTER:
		efc_log_debug(efc, ">>> reenter !!\n");
		fallthrough;

	case EFC_EVT_ENTER:
		/* send FLOGI */
		efc_send_flogi(node);
		efc_node_transition(node, __efc_fabric_flogi_wait_rsp, NULL);
		break;

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
efc_fabric_set_topology(struct efc_node *node,
			enum efc_nport_topology topology)
{
	node->nport->topology = topology;
}

void
efc_fabric_notify_topology(struct efc_node *node)
{
	struct efc_node *tmp_node;
	unsigned long index;

	/*
	 * now loop through the nodes in the nport
	 * and send topology notification
	 */
	xa_for_each(&node->nport->lookup, index, tmp_node) {
		if (tmp_node != node) {
			efc_node_post_event(tmp_node,
					    EFC_EVT_NPORT_TOPOLOGY_NOTIFY,
					    &node->nport->topology);
		}
	}
}

static bool efc_rnode_is_nport(struct fc_els_flogi *rsp)
{
	return !(ntohs(rsp->fl_csp.sp_features) & FC_SP_FT_FPORT);
}

void
__efc_fabric_flogi_wait_rsp(struct efc_sm_ctx *ctx,
			    enum efc_sm_event evt, void *arg)
{
	struct efc_node_cb *cbdata = arg;
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_SRRS_ELS_REQ_OK: {
		if (efc_node_check_els_req(ctx, evt, arg, ELS_FLOGI,
					   __efc_fabric_common, __func__)) {
			return;
		}
		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;

		memcpy(node->nport->domain->flogi_service_params,
		       cbdata->els_rsp.virt,
		       sizeof(struct fc_els_flogi));

		/* Check to see if the fabric is an F_PORT or and N_PORT */
		if (!efc_rnode_is_nport(cbdata->els_rsp.virt)) {
			/* sm: if not nport / efc_domain_attach */
			/* ext_status has the fc_id, attach domain */
			efc_fabric_set_topology(node, EFC_NPORT_TOPO_FABRIC);
			efc_fabric_notify_topology(node);
			WARN_ON(node->nport->domain->attached);
			efc_domain_attach(node->nport->domain,
					  cbdata->ext_status);
			efc_node_transition(node,
					    __efc_fabric_wait_domain_attach,
					    NULL);
			break;
		}

		/*  sm: if nport and p2p_winner / efc_domain_attach */
		efc_fabric_set_topology(node, EFC_NPORT_TOPO_P2P);
		if (efc_p2p_setup(node->nport)) {
			node_printf(node,
				    "p2p setup failed, shutting down node\n");
			node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
			efc_fabric_initiate_shutdown(node);
			break;
		}

		if (node->nport->p2p_winner) {
			efc_node_transition(node,
					    __efc_p2p_wait_domain_attach,
					     NULL);
			if (node->nport->domain->attached &&
			    !node->nport->domain->domain_notify_pend) {
				/*
				 * already attached,
				 * just send ATTACH_OK
				 */
				node_printf(node,
					    "p2p winner, domain already attached\n");
				efc_node_post_event(node,
						    EFC_EVT_DOMAIN_ATTACH_OK,
						    NULL);
			}
		} else {
			/*
			 * peer is p2p winner;
			 * PLOGI will be received on the
			 * remote SID=1 node;
			 * this node has served its purpose
			 */
			node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
			efc_fabric_initiate_shutdown(node);
		}

		break;
	}

	case EFC_EVT_ELS_REQ_ABORTED:
	case EFC_EVT_SRRS_ELS_REQ_RJT:
	case EFC_EVT_SRRS_ELS_REQ_FAIL: {
		struct efc_nport *nport = node->nport;
		/*
		 * with these errors, we have no recovery,
		 * so shutdown the nport, leave the link
		 * up and the domain ready
		 */
		if (efc_node_check_els_req(ctx, evt, arg, ELS_FLOGI,
					   __efc_fabric_common, __func__)) {
			return;
		}
		node_printf(node,
			    "FLOGI failed evt=%s, shutting down nport [%s]\n",
			    efc_sm_event_name(evt), nport->display_name);
		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;
		efc_sm_post_event(&nport->sm, EFC_EVT_SHUTDOWN, NULL);
		break;
	}

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_vport_fabric_init(struct efc_sm_ctx *ctx,
			enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_ENTER:
		/* sm: / send FDISC */
		efc_send_fdisc(node);
		efc_node_transition(node, __efc_fabric_fdisc_wait_rsp, NULL);
		break;

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_fabric_fdisc_wait_rsp(struct efc_sm_ctx *ctx,
			    enum efc_sm_event evt, void *arg)
{
	struct efc_node_cb *cbdata = arg;
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_SRRS_ELS_REQ_OK: {
		/* fc_id is in ext_status */
		if (efc_node_check_els_req(ctx, evt, arg, ELS_FDISC,
					   __efc_fabric_common, __func__)) {
			return;
		}

		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;
		/* sm: / efc_nport_attach */
		efc_nport_attach(node->nport, cbdata->ext_status);
		efc_node_transition(node, __efc_fabric_wait_domain_attach,
				    NULL);
		break;
	}

	case EFC_EVT_SRRS_ELS_REQ_RJT:
	case EFC_EVT_SRRS_ELS_REQ_FAIL: {
		if (efc_node_check_els_req(ctx, evt, arg, ELS_FDISC,
					   __efc_fabric_common, __func__)) {
			return;
		}
		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;
		efc_log_err(node->efc, "FDISC failed, shutting down nport\n");
		/* sm: / shutdown nport */
		efc_sm_post_event(&node->nport->sm, EFC_EVT_SHUTDOWN, NULL);
		break;
	}

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

static int
efc_start_ns_node(struct efc_nport *nport)
{
	struct efc_node *ns;

	/* Instantiate a name services node */
	ns = efc_node_find(nport, FC_FID_DIR_SERV);
	if (!ns) {
		ns = efc_node_alloc(nport, FC_FID_DIR_SERV, false, false);
		if (!ns)
			return -EIO;
	}
	/*
	 * for found ns, should we be transitioning from here?
	 * breaks transition only
	 *  1. from within state machine or
	 *  2. if after alloc
	 */
	if (ns->efc->nodedb_mask & EFC_NODEDB_PAUSE_NAMESERVER)
		efc_node_pause(ns, __efc_ns_init);
	else
		efc_node_transition(ns, __efc_ns_init, NULL);
	return 0;
}

static int
efc_start_fabctl_node(struct efc_nport *nport)
{
	struct efc_node *fabctl;

	fabctl = efc_node_find(nport, FC_FID_FCTRL);
	if (!fabctl) {
		fabctl = efc_node_alloc(nport, FC_FID_FCTRL,
					false, false);
		if (!fabctl)
			return -EIO;
	}
	/*
	 * for found ns, should we be transitioning from here?
	 * breaks transition only
	 *  1. from within state machine or
	 *  2. if after alloc
	 */
	efc_node_transition(fabctl, __efc_fabctl_init, NULL);
	return 0;
}

void
__efc_fabric_wait_domain_attach(struct efc_sm_ctx *ctx,
				enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_ENTER:
		efc_node_hold_frames(node);
		break;

	case EFC_EVT_EXIT:
		efc_node_accept_frames(node);
		break;
	case EFC_EVT_DOMAIN_ATTACH_OK:
	case EFC_EVT_NPORT_ATTACH_OK: {
		int rc;

		rc = efc_start_ns_node(node->nport);
		if (rc)
			return;

		/* sm: if enable_ini / start fabctl node */
		/* Instantiate the fabric controller (sends SCR) */
		if (node->nport->enable_rscn) {
			rc = efc_start_fabctl_node(node->nport);
			if (rc)
				return;
		}
		efc_node_transition(node, __efc_fabric_idle, NULL);
		break;
	}
	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_fabric_idle(struct efc_sm_ctx *ctx, enum efc_sm_event evt,
		  void *arg)
{
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_DOMAIN_ATTACH_OK:
		break;
	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_ns_init(struct efc_sm_ctx *ctx, enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_ENTER:
		/* sm: / send PLOGI */
		efc_send_plogi(node);
		efc_node_transition(node, __efc_ns_plogi_wait_rsp, NULL);
		break;
	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_ns_plogi_wait_rsp(struct efc_sm_ctx *ctx,
			enum efc_sm_event evt, void *arg)
{
	struct efc_node_cb *cbdata = arg;
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_SRRS_ELS_REQ_OK: {
		int rc;

		/* Save service parameters */
		if (efc_node_check_els_req(ctx, evt, arg, ELS_PLOGI,
					   __efc_fabric_common, __func__)) {
			return;
		}
		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;
		/* sm: / save sparams, efc_node_attach */
		efc_node_save_sparms(node, cbdata->els_rsp.virt);
		rc = efc_node_attach(node);
		efc_node_transition(node, __efc_ns_wait_node_attach, NULL);
		if (rc < 0)
			efc_node_post_event(node, EFC_EVT_NODE_ATTACH_FAIL,
					    NULL);
		break;
	}
	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_ns_wait_node_attach(struct efc_sm_ctx *ctx,
			  enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_ENTER:
		efc_node_hold_frames(node);
		break;

	case EFC_EVT_EXIT:
		efc_node_accept_frames(node);
		break;

	case EFC_EVT_NODE_ATTACH_OK:
		node->attached = true;
		/* sm: / send RFTID */
		efc_ns_send_rftid(node);
		efc_node_transition(node, __efc_ns_rftid_wait_rsp, NULL);
		break;

	case EFC_EVT_NODE_ATTACH_FAIL:
		/* node attach failed, shutdown the node */
		node->attached = false;
		node_printf(node, "Node attach failed\n");
		node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
		efc_fabric_initiate_shutdown(node);
		break;

	case EFC_EVT_SHUTDOWN:
		node_printf(node, "Shutdown event received\n");
		node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
		efc_node_transition(node,
				    __efc_fabric_wait_attach_evt_shutdown,
				     NULL);
		break;

	/*
	 * if receive RSCN just ignore,
	 * we haven't sent GID_PT yet (ACC sent by fabctl node)
	 */
	case EFC_EVT_RSCN_RCVD:
		break;

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_fabric_wait_attach_evt_shutdown(struct efc_sm_ctx *ctx,
				      enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_ENTER:
		efc_node_hold_frames(node);
		break;

	case EFC_EVT_EXIT:
		efc_node_accept_frames(node);
		break;

	/* wait for any of these attach events and then shutdown */
	case EFC_EVT_NODE_ATTACH_OK:
		node->attached = true;
		node_printf(node, "Attach evt=%s, proceed to shutdown\n",
			    efc_sm_event_name(evt));
		efc_fabric_initiate_shutdown(node);
		break;

	case EFC_EVT_NODE_ATTACH_FAIL:
		node->attached = false;
		node_printf(node, "Attach evt=%s, proceed to shutdown\n",
			    efc_sm_event_name(evt));
		efc_fabric_initiate_shutdown(node);
		break;

	/* ignore shutdown event as we're already in shutdown path */
	case EFC_EVT_SHUTDOWN:
		node_printf(node, "Shutdown event received\n");
		break;

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_ns_rftid_wait_rsp(struct efc_sm_ctx *ctx,
			enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_SRRS_ELS_REQ_OK:
		if (efc_node_check_ns_req(ctx, evt, arg, FC_NS_RFT_ID,
					  __efc_fabric_common, __func__)) {
			return;
		}
		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;
		/* sm: / send RFFID */
		efc_ns_send_rffid(node);
		efc_node_transition(node, __efc_ns_rffid_wait_rsp, NULL);
		break;

	/*
	 * if receive RSCN just ignore,
	 * we haven't sent GID_PT yet (ACC sent by fabctl node)
	 */
	case EFC_EVT_RSCN_RCVD:
		break;

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_ns_rffid_wait_rsp(struct efc_sm_ctx *ctx,
			enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	/*
	 * Waits for an RFFID response event;
	 * if rscn enabled, a GIDPT name services request is issued.
	 */
	switch (evt) {
	case EFC_EVT_SRRS_ELS_REQ_OK:	{
		if (efc_node_check_ns_req(ctx, evt, arg, FC_NS_RFF_ID,
					  __efc_fabric_common, __func__)) {
			return;
		}
		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;
		if (node->nport->enable_rscn) {
			/* sm: if enable_rscn / send GIDPT */
			efc_ns_send_gidpt(node);

			efc_node_transition(node, __efc_ns_gidpt_wait_rsp,
					    NULL);
		} else {
			/* if 'T' only, we're done, go to idle */
			efc_node_transition(node, __efc_ns_idle, NULL);
		}
		break;
	}
	/*
	 * if receive RSCN just ignore,
	 * we haven't sent GID_PT yet (ACC sent by fabctl node)
	 */
	case EFC_EVT_RSCN_RCVD:
		break;

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

static int
efc_process_gidpt_payload(struct efc_node *node,
			  void *data, u32 gidpt_len)
{
	u32 i, j;
	struct efc_node *newnode;
	struct efc_nport *nport = node->nport;
	struct efc *efc = node->efc;
	u32 port_id = 0, port_count, plist_count;
	struct efc_node *n;
	struct efc_node **active_nodes;
	int residual;
	struct {
		struct fc_ct_hdr hdr;
		struct fc_gid_pn_resp pn_rsp;
	} *rsp;
	struct fc_gid_pn_resp *gidpt;
	unsigned long index;

	rsp = data;
	gidpt = &rsp->pn_rsp;
	residual = be16_to_cpu(rsp->hdr.ct_mr_size);

	if (residual != 0)
		efc_log_debug(node->efc, "residual is %u words\n", residual);

	if (be16_to_cpu(rsp->hdr.ct_cmd) == FC_FS_RJT) {
		node_printf(node,
			    "GIDPT request failed: rsn x%x rsn_expl x%x\n",
			    rsp->hdr.ct_reason, rsp->hdr.ct_explan);
		return -EIO;
	}

	plist_count = (gidpt_len - sizeof(struct fc_ct_hdr)) / sizeof(*gidpt);

	/* Count the number of nodes */
	port_count = 0;
	xa_for_each(&nport->lookup, index, n) {
		port_count++;
	}

	/* Allocate a buffer for all nodes */
	active_nodes = kzalloc(port_count * sizeof(*active_nodes), GFP_ATOMIC);
	if (!active_nodes) {
		node_printf(node, "efc_malloc failed\n");
		return -EIO;
	}

	/* Fill buffer with fc_id of active nodes */
	i = 0;
	xa_for_each(&nport->lookup, index, n) {
		port_id = n->rnode.fc_id;
		switch (port_id) {
		case FC_FID_FLOGI:
		case FC_FID_FCTRL:
		case FC_FID_DIR_SERV:
			break;
		default:
			if (port_id != FC_FID_DOM_MGR)
				active_nodes[i++] = n;
			break;
		}
	}

	/* update the active nodes buffer */
	for (i = 0; i < plist_count; i++) {
		hton24(gidpt[i].fp_fid, port_id);

		for (j = 0; j < port_count; j++) {
			if (active_nodes[j] &&
			    port_id == active_nodes[j]->rnode.fc_id) {
				active_nodes[j] = NULL;
			}
		}

		if (gidpt[i].fp_resvd & FC_NS_FID_LAST)
			break;
	}

	/* Those remaining in the active_nodes[] are now gone ! */
	for (i = 0; i < port_count; i++) {
		/*
		 * if we're an initiator and the remote node
		 * is a target, then post the node missing event.
		 * if we're target and we have enabled
		 * target RSCN, then post the node missing event.
		 */
		if (!active_nodes[i])
			continue;

		if ((node->nport->enable_ini && active_nodes[i]->targ) ||
		    (node->nport->enable_tgt && enable_target_rscn(efc))) {
			efc_node_post_event(active_nodes[i],
					    EFC_EVT_NODE_MISSING, NULL);
		} else {
			node_printf(node,
				    "GID_PT: skipping non-tgt port_id x%06x\n",
				    active_nodes[i]->rnode.fc_id);
		}
	}
	kfree(active_nodes);

	for (i = 0; i < plist_count; i++) {
		hton24(gidpt[i].fp_fid, port_id);

		/* Don't create node for ourselves */
		if (port_id == node->rnode.nport->fc_id) {
			if (gidpt[i].fp_resvd & FC_NS_FID_LAST)
				break;
			continue;
		}

		newnode = efc_node_find(nport, port_id);
		if (!newnode) {
			if (!node->nport->enable_ini)
				continue;

			newnode = efc_node_alloc(nport, port_id, false, false);
			if (!newnode) {
				efc_log_err(efc, "efc_node_alloc() failed\n");
				return -EIO;
			}
			/*
			 * send PLOGI automatically
			 * if initiator
			 */
			efc_node_init_device(newnode, true);
		}

		if (node->nport->enable_ini && newnode->targ) {
			efc_node_post_event(newnode, EFC_EVT_NODE_REFOUND,
					    NULL);
		}

		if (gidpt[i].fp_resvd & FC_NS_FID_LAST)
			break;
	}
	return 0;
}

void
__efc_ns_gidpt_wait_rsp(struct efc_sm_ctx *ctx,
			enum efc_sm_event evt, void *arg)
{
	struct efc_node_cb *cbdata = arg;
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();
	/*
	 * Wait for a GIDPT response from the name server. Process the FC_IDs
	 * that are reported by creating new remote ports, as needed.
	 */

	switch (evt) {
	case EFC_EVT_SRRS_ELS_REQ_OK:	{
		if (efc_node_check_ns_req(ctx, evt, arg, FC_NS_GID_PT,
					  __efc_fabric_common, __func__)) {
			return;
		}
		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;
		/* sm: / process GIDPT payload */
		efc_process_gidpt_payload(node, cbdata->els_rsp.virt,
					  cbdata->els_rsp.len);
		efc_node_transition(node, __efc_ns_idle, NULL);
		break;
	}

	case EFC_EVT_SRRS_ELS_REQ_FAIL:	{
		/* not much we can do; will retry with the next RSCN */
		node_printf(node, "GID_PT failed to complete\n");
		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;
		efc_node_transition(node, __efc_ns_idle, NULL);
		break;
	}

	/* if receive RSCN here, queue up another discovery processing */
	case EFC_EVT_RSCN_RCVD: {
		node_printf(node, "RSCN received during GID_PT processing\n");
		node->rscn_pending = true;
		break;
	}

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_ns_idle(struct efc_sm_ctx *ctx, enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = ctx->app;
	struct efc *efc = node->efc;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	/*
	 * Wait for RSCN received events (posted from the fabric controller)
	 * and restart the GIDPT name services query and processing.
	 */

	switch (evt) {
	case EFC_EVT_ENTER:
		if (!node->rscn_pending)
			break;

		node_printf(node, "RSCN pending, restart discovery\n");
		node->rscn_pending = false;
		fallthrough;

	case EFC_EVT_RSCN_RCVD: {
		/* sm: / send GIDPT */
		/*
		 * If target RSCN processing is enabled,
		 * and this is target only (not initiator),
		 * and tgt_rscn_delay is non-zero,
		 * then we delay issuing the GID_PT
		 */
		if (efc->tgt_rscn_delay_msec != 0 &&
		    !node->nport->enable_ini && node->nport->enable_tgt &&
		    enable_target_rscn(efc)) {
			efc_node_transition(node, __efc_ns_gidpt_delay, NULL);
		} else {
			efc_ns_send_gidpt(node);
			efc_node_transition(node, __efc_ns_gidpt_wait_rsp,
					    NULL);
		}
		break;
	}

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

static void
gidpt_delay_timer_cb(struct timer_list *t)
{
	struct efc_node *node = from_timer(node, t, gidpt_delay_timer);

	del_timer(&node->gidpt_delay_timer);

	efc_node_post_event(node, EFC_EVT_GIDPT_DELAY_EXPIRED, NULL);
}

void
__efc_ns_gidpt_delay(struct efc_sm_ctx *ctx,
		     enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = ctx->app;
	struct efc *efc = node->efc;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_ENTER: {
		u64 delay_msec, tmp;

		/*
		 * Compute the delay time.
		 * Set to tgt_rscn_delay, if the time since last GIDPT
		 * is less than tgt_rscn_period, then use tgt_rscn_period.
		 */
		delay_msec = efc->tgt_rscn_delay_msec;
		tmp = jiffies_to_msecs(jiffies) - node->time_last_gidpt_msec;
		if (tmp < efc->tgt_rscn_period_msec)
			delay_msec = efc->tgt_rscn_period_msec;

		timer_setup(&node->gidpt_delay_timer, &gidpt_delay_timer_cb,
			    0);
		mod_timer(&node->gidpt_delay_timer,
			  jiffies + msecs_to_jiffies(delay_msec));

		break;
	}

	case EFC_EVT_GIDPT_DELAY_EXPIRED:
		node->time_last_gidpt_msec = jiffies_to_msecs(jiffies);

		efc_ns_send_gidpt(node);
		efc_node_transition(node, __efc_ns_gidpt_wait_rsp, NULL);
		break;

	case EFC_EVT_RSCN_RCVD: {
		efc_log_debug(efc,
			      "RSCN received while in GIDPT delay - no action\n");
		break;
	}

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_fabctl_init(struct efc_sm_ctx *ctx,
		  enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = ctx->app;

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_ENTER:
		/* no need to login to fabric controller, just send SCR */
		efc_send_scr(node);
		efc_node_transition(node, __efc_fabctl_wait_scr_rsp, NULL);
		break;

	case EFC_EVT_NODE_ATTACH_OK:
		node->attached = true;
		break;

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_fabctl_wait_scr_rsp(struct efc_sm_ctx *ctx,
			  enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	/*
	 * Fabric controller node state machine:
	 * Wait for an SCR response from the fabric controller.
	 */
	switch (evt) {
	case EFC_EVT_SRRS_ELS_REQ_OK:
		if (efc_node_check_els_req(ctx, evt, arg, ELS_SCR,
					   __efc_fabric_common, __func__)) {
			return;
		}
		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;
		efc_node_transition(node, __efc_fabctl_ready, NULL);
		break;

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

static void
efc_process_rscn(struct efc_node *node, struct efc_node_cb *cbdata)
{
	struct efc *efc = node->efc;
	struct efc_nport *nport = node->nport;
	struct efc_node *ns;

	/* Forward this event to the name-services node */
	ns = efc_node_find(nport, FC_FID_DIR_SERV);
	if (ns)
		efc_node_post_event(ns, EFC_EVT_RSCN_RCVD, cbdata);
	else
		efc_log_warn(efc, "can't find name server node\n");
}

void
__efc_fabctl_ready(struct efc_sm_ctx *ctx,
		   enum efc_sm_event evt, void *arg)
{
	struct efc_node_cb *cbdata = arg;
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	/*
	 * Fabric controller node state machine: Ready.
	 * In this state, the fabric controller sends a RSCN, which is received
	 * by this node and is forwarded to the name services node object; and
	 * the RSCN LS_ACC is sent.
	 */
	switch (evt) {
	case EFC_EVT_RSCN_RCVD: {
		struct fc_frame_header *hdr = cbdata->header->dma.virt;

		/*
		 * sm: / process RSCN (forward to name services node),
		 * send LS_ACC
		 */
		efc_process_rscn(node, cbdata);
		efc_send_ls_acc(node, be16_to_cpu(hdr->fh_ox_id));
		efc_node_transition(node, __efc_fabctl_wait_ls_acc_cmpl,
				    NULL);
		break;
	}

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_fabctl_wait_ls_acc_cmpl(struct efc_sm_ctx *ctx,
			      enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_ENTER:
		efc_node_hold_frames(node);
		break;

	case EFC_EVT_EXIT:
		efc_node_accept_frames(node);
		break;

	case EFC_EVT_SRRS_ELS_CMPL_OK:
		WARN_ON(!node->els_cmpl_cnt);
		node->els_cmpl_cnt--;
		efc_node_transition(node, __efc_fabctl_ready, NULL);
		break;

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

static uint64_t
efc_get_wwpn(struct fc_els_flogi *sp)
{
	return be64_to_cpu(sp->fl_wwnn);
}

static int
efc_rnode_is_winner(struct efc_nport *nport)
{
	struct fc_els_flogi *remote_sp;
	u64 remote_wwpn;
	u64 local_wwpn = nport->wwpn;
	u64 wwn_bump = 0;

	remote_sp = (struct fc_els_flogi *)nport->domain->flogi_service_params;
	remote_wwpn = efc_get_wwpn(remote_sp);

	local_wwpn ^= wwn_bump;

	efc_log_debug(nport->efc, "r: %llx\n",
		      be64_to_cpu(remote_sp->fl_wwpn));
	efc_log_debug(nport->efc, "l: %llx\n", local_wwpn);

	if (remote_wwpn == local_wwpn) {
		efc_log_warn(nport->efc,
			     "WWPN of remote node [%08x %08x] matches local WWPN\n",
			     (u32)(local_wwpn >> 32ll),
			     (u32)local_wwpn);
		return -1;
	}

	return (remote_wwpn > local_wwpn);
}

void
__efc_p2p_wait_domain_attach(struct efc_sm_ctx *ctx,
			     enum efc_sm_event evt, void *arg)
{
	struct efc_node *node = ctx->app;
	struct efc *efc = node->efc;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_ENTER:
		efc_node_hold_frames(node);
		break;

	case EFC_EVT_EXIT:
		efc_node_accept_frames(node);
		break;

	case EFC_EVT_DOMAIN_ATTACH_OK: {
		struct efc_nport *nport = node->nport;
		struct efc_node *rnode;

		/*
		 * this transient node (SID=0 (recv'd FLOGI)
		 * or DID=fabric (sent FLOGI))
		 * is the p2p winner, will use a separate node
		 * to send PLOGI to peer
		 */
		WARN_ON(!node->nport->p2p_winner);

		rnode = efc_node_find(nport, node->nport->p2p_remote_port_id);
		if (rnode) {
			/*
			 * the "other" transient p2p node has
			 * already kicked off the
			 * new node from which PLOGI is sent
			 */
			node_printf(node,
				    "Node with fc_id x%x already exists\n",
				    rnode->rnode.fc_id);
		} else {
			/*
			 * create new node (SID=1, DID=2)
			 * from which to send PLOGI
			 */
			rnode = efc_node_alloc(nport,
					       nport->p2p_remote_port_id,
						false, false);
			if (!rnode) {
				efc_log_err(efc, "node alloc failed\n");
				return;
			}

			efc_fabric_notify_topology(node);
			/* sm: / allocate p2p remote node */
			efc_node_transition(rnode, __efc_p2p_rnode_init,
					    NULL);
		}

		/*
		 * the transient node (SID=0 or DID=fabric)
		 * has served its purpose
		 */
		if (node->rnode.fc_id == 0) {
			/*
			 * if this is the SID=0 node,
			 * move to the init state in case peer
			 * has restarted FLOGI discovery and FLOGI is pending
			 */
			/* don't send PLOGI on efc_d_init entry */
			efc_node_init_device(node, false);
		} else {
			/*
			 * if this is the DID=fabric node
			 * (we initiated FLOGI), shut it down
			 */
			node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
			efc_fabric_initiate_shutdown(node);
		}
		break;
	}

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_p2p_rnode_init(struct efc_sm_ctx *ctx,
		     enum efc_sm_event evt, void *arg)
{
	struct efc_node_cb *cbdata = arg;
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_ENTER:
		/* sm: / send PLOGI */
		efc_send_plogi(node);
		efc_node_transition(node, __efc_p2p_wait_plogi_rsp, NULL);
		break;

	case EFC_EVT_ABTS_RCVD:
		/* sm: send BA_ACC */
		efc_send_bls_acc(node, cbdata->header->dma.virt);

		break;

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_p2p_wait_flogi_acc_cmpl(struct efc_sm_ctx *ctx,
			      enum efc_sm_event evt, void *arg)
{
	struct efc_node_cb *cbdata = arg;
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_ENTER:
		efc_node_hold_frames(node);
		break;

	case EFC_EVT_EXIT:
		efc_node_accept_frames(node);
		break;

	case EFC_EVT_SRRS_ELS_CMPL_OK:
		WARN_ON(!node->els_cmpl_cnt);
		node->els_cmpl_cnt--;

		/* sm: if p2p_winner / domain_attach */
		if (node->nport->p2p_winner) {
			efc_node_transition(node,
					    __efc_p2p_wait_domain_attach,
					NULL);
			if (!node->nport->domain->attached) {
				node_printf(node, "Domain not attached\n");
				efc_domain_attach(node->nport->domain,
						  node->nport->p2p_port_id);
			} else {
				node_printf(node, "Domain already attached\n");
				efc_node_post_event(node,
						    EFC_EVT_DOMAIN_ATTACH_OK,
						    NULL);
			}
		} else {
			/* this node has served its purpose;
			 * we'll expect a PLOGI on a separate
			 * node (remote SID=0x1); return this node
			 * to init state in case peer
			 * restarts discovery -- it may already
			 * have (pending frames may exist).
			 */
			/* don't send PLOGI on efc_d_init entry */
			efc_node_init_device(node, false);
		}
		break;

	case EFC_EVT_SRRS_ELS_CMPL_FAIL:
		/*
		 * LS_ACC failed, possibly due to link down;
		 * shutdown node and wait
		 * for FLOGI discovery to restart
		 */
		node_printf(node, "FLOGI LS_ACC failed, shutting down\n");
		WARN_ON(!node->els_cmpl_cnt);
		node->els_cmpl_cnt--;
		node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
		efc_fabric_initiate_shutdown(node);
		break;

	case EFC_EVT_ABTS_RCVD: {
		/* sm: / send BA_ACC */
		efc_send_bls_acc(node, cbdata->header->dma.virt);
		break;
	}

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_p2p_wait_plogi_rsp(struct efc_sm_ctx *ctx,
			 enum efc_sm_event evt, void *arg)
{
	struct efc_node_cb *cbdata = arg;
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_SRRS_ELS_REQ_OK: {
		int rc;

		if (efc_node_check_els_req(ctx, evt, arg, ELS_PLOGI,
					   __efc_fabric_common, __func__)) {
			return;
		}
		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;
		/* sm: / save sparams, efc_node_attach */
		efc_node_save_sparms(node, cbdata->els_rsp.virt);
		rc = efc_node_attach(node);
		efc_node_transition(node, __efc_p2p_wait_node_attach, NULL);
		if (rc < 0)
			efc_node_post_event(node, EFC_EVT_NODE_ATTACH_FAIL,
					    NULL);
		break;
	}
	case EFC_EVT_SRRS_ELS_REQ_FAIL: {
		if (efc_node_check_els_req(ctx, evt, arg, ELS_PLOGI,
					   __efc_fabric_common, __func__)) {
			return;
		}
		node_printf(node, "PLOGI failed, shutting down\n");
		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;
		node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
		efc_fabric_initiate_shutdown(node);
		break;
	}

	case EFC_EVT_PLOGI_RCVD: {
		struct fc_frame_header *hdr = cbdata->header->dma.virt;
		/* if we're in external loopback mode, just send LS_ACC */
		if (node->efc->external_loopback) {
			efc_send_plogi_acc(node, be16_to_cpu(hdr->fh_ox_id));
		} else {
			/*
			 * if this isn't external loopback,
			 * pass to default handler
			 */
			__efc_fabric_common(__func__, ctx, evt, arg);
		}
		break;
	}
	case EFC_EVT_PRLI_RCVD:
		/* I, or I+T */
		/* sent PLOGI and before completion was seen, received the
		 * PRLI from the remote node (WCQEs and RCQEs come in on
		 * different queues and order of processing cannot be assumed)
		 * Save OXID so PRLI can be sent after the attach and continue
		 * to wait for PLOGI response
		 */
		efc_process_prli_payload(node, cbdata->payload->dma.virt);
		efc_send_ls_acc_after_attach(node,
					     cbdata->header->dma.virt,
					     EFC_NODE_SEND_LS_ACC_PRLI);
		efc_node_transition(node, __efc_p2p_wait_plogi_rsp_recvd_prli,
				    NULL);
		break;
	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_p2p_wait_plogi_rsp_recvd_prli(struct efc_sm_ctx *ctx,
				    enum efc_sm_event evt, void *arg)
{
	struct efc_node_cb *cbdata = arg;
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_ENTER:
		/*
		 * Since we've received a PRLI, we have a port login and will
		 * just need to wait for the PLOGI response to do the node
		 * attach and then we can send the LS_ACC for the PRLI. If,
		 * during this time, we receive FCP_CMNDs (which is possible
		 * since we've already sent a PRLI and our peer may have
		 * accepted).
		 * At this time, we are not waiting on any other unsolicited
		 * frames to continue with the login process. Thus, it will not
		 * hurt to hold frames here.
		 */
		efc_node_hold_frames(node);
		break;

	case EFC_EVT_EXIT:
		efc_node_accept_frames(node);
		break;

	case EFC_EVT_SRRS_ELS_REQ_OK: {	/* PLOGI response received */
		int rc;

		/* Completion from PLOGI sent */
		if (efc_node_check_els_req(ctx, evt, arg, ELS_PLOGI,
					   __efc_fabric_common, __func__)) {
			return;
		}
		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;
		/* sm: / save sparams, efc_node_attach */
		efc_node_save_sparms(node, cbdata->els_rsp.virt);
		rc = efc_node_attach(node);
		efc_node_transition(node, __efc_p2p_wait_node_attach, NULL);
		if (rc < 0)
			efc_node_post_event(node, EFC_EVT_NODE_ATTACH_FAIL,
					    NULL);
		break;
	}
	case EFC_EVT_SRRS_ELS_REQ_FAIL:	/* PLOGI response received */
	case EFC_EVT_SRRS_ELS_REQ_RJT:
		/* PLOGI failed, shutdown the node */
		if (efc_node_check_els_req(ctx, evt, arg, ELS_PLOGI,
					   __efc_fabric_common, __func__)) {
			return;
		}
		WARN_ON(!node->els_req_cnt);
		node->els_req_cnt--;
		node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
		efc_fabric_initiate_shutdown(node);
		break;

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

void
__efc_p2p_wait_node_attach(struct efc_sm_ctx *ctx,
			   enum efc_sm_event evt, void *arg)
{
	struct efc_node_cb *cbdata = arg;
	struct efc_node *node = ctx->app;

	efc_node_evt_set(ctx, evt, __func__);

	node_sm_trace();

	switch (evt) {
	case EFC_EVT_ENTER:
		efc_node_hold_frames(node);
		break;

	case EFC_EVT_EXIT:
		efc_node_accept_frames(node);
		break;

	case EFC_EVT_NODE_ATTACH_OK:
		node->attached = true;
		switch (node->send_ls_acc) {
		case EFC_NODE_SEND_LS_ACC_PRLI: {
			efc_d_send_prli_rsp(node->ls_acc_io,
					    node->ls_acc_oxid);
			node->send_ls_acc = EFC_NODE_SEND_LS_ACC_NONE;
			node->ls_acc_io = NULL;
			break;
		}
		case EFC_NODE_SEND_LS_ACC_PLOGI: /* Can't happen in P2P */
		case EFC_NODE_SEND_LS_ACC_NONE:
		default:
			/* Normal case for I */
			/* sm: send_plogi_acc is not set / send PLOGI acc */
			efc_node_transition(node, __efc_d_port_logged_in,
					    NULL);
			break;
		}
		break;

	case EFC_EVT_NODE_ATTACH_FAIL:
		/* node attach failed, shutdown the node */
		node->attached = false;
		node_printf(node, "Node attach failed\n");
		node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
		efc_fabric_initiate_shutdown(node);
		break;

	case EFC_EVT_SHUTDOWN:
		node_printf(node, "%s received\n", efc_sm_event_name(evt));
		node->shutdown_reason = EFC_NODE_SHUTDOWN_DEFAULT;
		efc_node_transition(node,
				    __efc_fabric_wait_attach_evt_shutdown,
				     NULL);
		break;
	case EFC_EVT_PRLI_RCVD:
		node_printf(node, "%s: PRLI received before node is attached\n",
			    efc_sm_event_name(evt));
		efc_process_prli_payload(node, cbdata->payload->dma.virt);
		efc_send_ls_acc_after_attach(node,
					     cbdata->header->dma.virt,
				EFC_NODE_SEND_LS_ACC_PRLI);
		break;

	default:
		__efc_fabric_common(__func__, ctx, evt, arg);
	}
}

int
efc_p2p_setup(struct efc_nport *nport)
{
	struct efc *efc = nport->efc;
	int rnode_winner;

	rnode_winner = efc_rnode_is_winner(nport);

	/* set nport flags to indicate p2p "winner" */
	if (rnode_winner == 1) {
		nport->p2p_remote_port_id = 0;
		nport->p2p_port_id = 0;
		nport->p2p_winner = false;
	} else if (rnode_winner == 0) {
		nport->p2p_remote_port_id = 2;
		nport->p2p_port_id = 1;
		nport->p2p_winner = true;
	} else {
		/* no winner; only okay if external loopback enabled */
		if (nport->efc->external_loopback) {
			/*
			 * External loopback mode enabled;
			 * local nport and remote node
			 * will be registered with an NPortID = 1;
			 */
			efc_log_debug(efc,
				      "External loopback mode enabled\n");
			nport->p2p_remote_port_id = 1;
			nport->p2p_port_id = 1;
			nport->p2p_winner = true;
		} else {
			efc_log_warn(efc,
				     "failed to determine p2p winner\n");
			return rnode_winner;
		}
	}
	return 0;
}