aboutsummaryrefslogtreecommitdiff
path: root/drivers/scsi/fcoe/libfcoe.c
blob: 50aaa4bcfc5062cd66301f660f469dd131fd0359 (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
/*
 * Copyright (c) 2008-2009 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2009 Intel Corporation.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Maintained at www.Open-FCoE.org
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/errno.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <net/rtnetlink.h>

#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_fs.h>
#include <scsi/fc/fc_fip.h>
#include <scsi/fc/fc_encaps.h>
#include <scsi/fc/fc_fcoe.h>

#include <scsi/libfc.h>
#include <scsi/libfcoe.h>

MODULE_AUTHOR("Open-FCoE.org");
MODULE_DESCRIPTION("FIP discovery protocol support for FCoE HBAs");
MODULE_LICENSE("GPL v2");

#define	FCOE_CTLR_MIN_FKA	500		/* min keep alive (mS) */
#define	FCOE_CTLR_DEF_FKA	FIP_DEF_FKA	/* default keep alive (mS) */

static void fcoe_ctlr_timeout(unsigned long);
static void fcoe_ctlr_timer_work(struct work_struct *);
static void fcoe_ctlr_recv_work(struct work_struct *);

static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;

unsigned int libfcoe_debug_logging;
module_param_named(debug_logging, libfcoe_debug_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");

#define LIBFCOE_LOGGING	    0x01 /* General logging, not categorized */
#define LIBFCOE_FIP_LOGGING 0x02 /* FIP logging */

#define LIBFCOE_CHECK_LOGGING(LEVEL, CMD)		\
do {							\
	if (unlikely(libfcoe_debug_logging & LEVEL))	\
		do {					\
			CMD;				\
		} while (0);				\
} while (0)

#define LIBFCOE_DBG(fmt, args...)					\
	LIBFCOE_CHECK_LOGGING(LIBFCOE_LOGGING,				\
			      printk(KERN_INFO "libfcoe: " fmt, ##args);)

#define LIBFCOE_FIP_DBG(fip, fmt, args...)				\
	LIBFCOE_CHECK_LOGGING(LIBFCOE_FIP_LOGGING,			\
			      printk(KERN_INFO "host%d: fip: " fmt, 	\
				     (fip)->lp->host->host_no, ##args);)

/**
 * fcoe_ctlr_mtu_valid() - Check if a FCF's MTU is valid
 * @fcf: The FCF to check
 *
 * Return non-zero if FCF fcoe_size has been validated.
 */
static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf)
{
	return (fcf->flags & FIP_FL_SOL) != 0;
}

/**
 * fcoe_ctlr_fcf_usable() - Check if a FCF is usable
 * @fcf: The FCF to check
 *
 * Return non-zero if the FCF is usable.
 */
static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf)
{
	u16 flags = FIP_FL_SOL | FIP_FL_AVAIL;

	return (fcf->flags & flags) == flags;
}

/**
 * fcoe_ctlr_init() - Initialize the FCoE Controller instance
 * @fip: The FCoE controller to initialize
 */
void fcoe_ctlr_init(struct fcoe_ctlr *fip)
{
	fip->state = FIP_ST_LINK_WAIT;
	fip->mode = FIP_ST_AUTO;
	INIT_LIST_HEAD(&fip->fcfs);
	spin_lock_init(&fip->lock);
	fip->flogi_oxid = FC_XID_UNKNOWN;
	setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip);
	INIT_WORK(&fip->timer_work, fcoe_ctlr_timer_work);
	INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work);
	skb_queue_head_init(&fip->fip_recv_list);
}
EXPORT_SYMBOL(fcoe_ctlr_init);

/**
 * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller
 * @fip: The FCoE controller whose FCFs are to be reset
 *
 * Called with &fcoe_ctlr lock held.
 */
static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip)
{
	struct fcoe_fcf *fcf;
	struct fcoe_fcf *next;

	fip->sel_fcf = NULL;
	list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
		list_del(&fcf->list);
		kfree(fcf);
	}
	fip->fcf_count = 0;
	fip->sel_time = 0;
}

/**
 * fcoe_ctlr_destroy() - Disable and tear down a FCoE controller
 * @fip: The FCoE controller to tear down
 *
 * This is called by FCoE drivers before freeing the &fcoe_ctlr.
 *
 * The receive handler will have been deleted before this to guarantee
 * that no more recv_work will be scheduled.
 *
 * The timer routine will simply return once we set FIP_ST_DISABLED.
 * This guarantees that no further timeouts or work will be scheduled.
 */
void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
{
	cancel_work_sync(&fip->recv_work);
	skb_queue_purge(&fip->fip_recv_list);

	spin_lock_bh(&fip->lock);
	fip->state = FIP_ST_DISABLED;
	fcoe_ctlr_reset_fcfs(fip);
	spin_unlock_bh(&fip->lock);
	del_timer_sync(&fip->timer);
	cancel_work_sync(&fip->timer_work);
}
EXPORT_SYMBOL(fcoe_ctlr_destroy);

/**
 * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port
 * @fip: The FCoE controller to get the maximum FCoE size from
 *
 * Returns the maximum packet size including the FCoE header and trailer,
 * but not including any Ethernet or VLAN headers.
 */
static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip)
{
	/*
	 * Determine the max FCoE frame size allowed, including
	 * FCoE header and trailer.
	 * Note:  lp->mfs is currently the payload size, not the frame size.
	 */
	return fip->lp->mfs + sizeof(struct fc_frame_header) +
		sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof);
}

/**
 * fcoe_ctlr_solicit() - Send a FIP solicitation
 * @fip: The FCoE controller to send the solicitation on
 * @fcf: The destination FCF (if NULL, a multicast solicitation is sent)
 */
static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf)
{
	struct sk_buff *skb;
	struct fip_sol {
		struct ethhdr eth;
		struct fip_header fip;
		struct {
			struct fip_mac_desc mac;
			struct fip_wwn_desc wwnn;
			struct fip_size_desc size;
		} __attribute__((packed)) desc;
	}  __attribute__((packed)) *sol;
	u32 fcoe_size;

	skb = dev_alloc_skb(sizeof(*sol));
	if (!skb)
		return;

	sol = (struct fip_sol *)skb->data;

	memset(sol, 0, sizeof(*sol));
	memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN);
	memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
	sol->eth.h_proto = htons(ETH_P_FIP);

	sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
	sol->fip.fip_op = htons(FIP_OP_DISC);
	sol->fip.fip_subcode = FIP_SC_SOL;
	sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW);
	sol->fip.fip_flags = htons(FIP_FL_FPMA);
	if (fip->spma)
		sol->fip.fip_flags |= htons(FIP_FL_SPMA);

	sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
	sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW;
	memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);

	sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
	sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW;
	put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn);

	fcoe_size = fcoe_ctlr_fcoe_size(fip);
	sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
	sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW;
	sol->desc.size.fd_size = htons(fcoe_size);

	skb_put(skb, sizeof(*sol));
	skb->protocol = htons(ETH_P_FIP);
	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	fip->send(fip, skb);

	if (!fcf)
		fip->sol_time = jiffies;
}

/**
 * fcoe_ctlr_link_up() - Start FCoE controller
 * @fip: The FCoE controller to start
 *
 * Called from the LLD when the network link is ready.
 */
void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
{
	spin_lock_bh(&fip->lock);
	if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
		spin_unlock_bh(&fip->lock);
		fc_linkup(fip->lp);
	} else if (fip->state == FIP_ST_LINK_WAIT) {
		fip->state = fip->mode;
		spin_unlock_bh(&fip->lock);
		if (fip->state == FIP_ST_AUTO)
			LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n");
		fc_linkup(fip->lp);
		fcoe_ctlr_solicit(fip, NULL);
	} else
		spin_unlock_bh(&fip->lock);
}
EXPORT_SYMBOL(fcoe_ctlr_link_up);

/**
 * fcoe_ctlr_reset() - Reset a FCoE controller
 * @fip:       The FCoE controller to reset
 */
static void fcoe_ctlr_reset(struct fcoe_ctlr *fip)
{
	fcoe_ctlr_reset_fcfs(fip);
	del_timer(&fip->timer);
	fip->ctlr_ka_time = 0;
	fip->port_ka_time = 0;
	fip->sol_time = 0;
	fip->flogi_oxid = FC_XID_UNKNOWN;
	fip->map_dest = 0;
}

/**
 * fcoe_ctlr_link_down() - Stop a FCoE controller
 * @fip: The FCoE controller to be stopped
 *
 * Returns non-zero if the link was up and now isn't.
 *
 * Called from the LLD when the network link is not ready.
 * There may be multiple calls while the link is down.
 */
int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
{
	int link_dropped;

	LIBFCOE_FIP_DBG(fip, "link down.\n");
	spin_lock_bh(&fip->lock);
	fcoe_ctlr_reset(fip);
	link_dropped = fip->state != FIP_ST_LINK_WAIT;
	fip->state = FIP_ST_LINK_WAIT;
	spin_unlock_bh(&fip->lock);

	if (link_dropped)
		fc_linkdown(fip->lp);
	return link_dropped;
}
EXPORT_SYMBOL(fcoe_ctlr_link_down);

/**
 * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF
 * @fip:   The FCoE controller to send the FKA on
 * @lport: libfc fc_lport to send from
 * @ports: 0 for controller keep-alive, 1 for port keep-alive
 * @sa:	   The source MAC address
 *
 * A controller keep-alive is sent every fka_period (typically 8 seconds).
 * The source MAC is the native MAC address.
 *
 * A port keep-alive is sent every 90 seconds while logged in.
 * The source MAC is the assigned mapped source address.
 * The destination is the FCF's F-port.
 */
static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip,
				      struct fc_lport *lport,
				      int ports, u8 *sa)
{
	struct sk_buff *skb;
	struct fip_kal {
		struct ethhdr eth;
		struct fip_header fip;
		struct fip_mac_desc mac;
	} __attribute__((packed)) *kal;
	struct fip_vn_desc *vn;
	u32 len;
	struct fc_lport *lp;
	struct fcoe_fcf *fcf;

	fcf = fip->sel_fcf;
	lp = fip->lp;
	if (!fcf || !lp->port_id)
		return;

	len = sizeof(*kal) + ports * sizeof(*vn);
	skb = dev_alloc_skb(len);
	if (!skb)
		return;

	kal = (struct fip_kal *)skb->data;
	memset(kal, 0, len);
	memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
	memcpy(kal->eth.h_source, sa, ETH_ALEN);
	kal->eth.h_proto = htons(ETH_P_FIP);

	kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
	kal->fip.fip_op = htons(FIP_OP_CTRL);
	kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE;
	kal->fip.fip_dl_len = htons((sizeof(kal->mac) +
				     ports * sizeof(*vn)) / FIP_BPW);
	kal->fip.fip_flags = htons(FIP_FL_FPMA);
	if (fip->spma)
		kal->fip.fip_flags |= htons(FIP_FL_SPMA);

	kal->mac.fd_desc.fip_dtype = FIP_DT_MAC;
	kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW;
	memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
	if (ports) {
		vn = (struct fip_vn_desc *)(kal + 1);
		vn->fd_desc.fip_dtype = FIP_DT_VN_ID;
		vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW;
		memcpy(vn->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
		hton24(vn->fd_fc_id, lport->port_id);
		put_unaligned_be64(lport->wwpn, &vn->fd_wwpn);
	}
	skb_put(skb, len);
	skb->protocol = htons(ETH_P_FIP);
	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	fip->send(fip, skb);
}

/**
 * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it
 * @fip:   The FCoE controller for the ELS frame
 * @dtype: The FIP descriptor type for the frame
 * @skb:   The FCoE ELS frame including FC header but no FCoE headers
 *
 * Returns non-zero error code on failure.
 *
 * The caller must check that the length is a multiple of 4.
 *
 * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes).
 * Headroom includes the FIP encapsulation description, FIP header, and
 * Ethernet header.  The tailroom is for the FIP MAC descriptor.
 */
static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, struct fc_lport *lport,
			    u8 dtype, struct sk_buff *skb)
{
	struct fip_encaps_head {
		struct ethhdr eth;
		struct fip_header fip;
		struct fip_encaps encaps;
	} __attribute__((packed)) *cap;
	struct fip_mac_desc *mac;
	struct fcoe_fcf *fcf;
	size_t dlen;
	u16 fip_flags;

	fcf = fip->sel_fcf;
	if (!fcf)
		return -ENODEV;

	/* set flags according to both FCF and lport's capability on SPMA */
	fip_flags = fcf->flags;
	fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA : FIP_FL_FPMA;
	if (!fip_flags)
		return -ENODEV;

	dlen = sizeof(struct fip_encaps) + skb->len;	/* len before push */
	cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap));

	memset(cap, 0, sizeof(*cap));
	memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
	memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
	cap->eth.h_proto = htons(ETH_P_FIP);

	cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
	cap->fip.fip_op = htons(FIP_OP_LS);
	cap->fip.fip_subcode = FIP_SC_REQ;
	cap->fip.fip_dl_len = htons((dlen + sizeof(*mac)) / FIP_BPW);
	cap->fip.fip_flags = htons(fip_flags);

	cap->encaps.fd_desc.fip_dtype = dtype;
	cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;

	mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac));
	memset(mac, 0, sizeof(*mac));
	mac->fd_desc.fip_dtype = FIP_DT_MAC;
	mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
	if (dtype != FIP_DT_FLOGI && dtype != FIP_DT_FDISC) {
		memcpy(mac->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
	} else if (fip_flags & FIP_FL_SPMA) {
		LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with SPMA\n");
		memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN);
	} else {
		LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with FPMA\n");
		/* FPMA only FLOGI must leave the MAC desc set to all 0s */
	}

	skb->protocol = htons(ETH_P_FIP);
	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	return 0;
}

/**
 * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate.
 * @fip:	FCoE controller.
 * @lport:	libfc fc_lport to send from
 * @skb:	FCoE ELS frame including FC header but no FCoE headers.
 *
 * Returns a non-zero error code if the frame should not be sent.
 * Returns zero if the caller should send the frame with FCoE encapsulation.
 *
 * The caller must check that the length is a multiple of 4.
 * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes).
 */
int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport,
		       struct sk_buff *skb)
{
	struct fc_frame_header *fh;
	u16 old_xid;
	u8 op;
	u8 mac[ETH_ALEN];

	fh = (struct fc_frame_header *)skb->data;
	op = *(u8 *)(fh + 1);

	if (op == ELS_FLOGI) {
		old_xid = fip->flogi_oxid;
		fip->flogi_oxid = ntohs(fh->fh_ox_id);
		if (fip->state == FIP_ST_AUTO) {
			if (old_xid == FC_XID_UNKNOWN)
				fip->flogi_count = 0;
			fip->flogi_count++;
			if (fip->flogi_count < 3)
				goto drop;
			fip->map_dest = 1;
			return 0;
		}
		if (fip->state == FIP_ST_NON_FIP)
			fip->map_dest = 1;
	}

	if (fip->state == FIP_ST_NON_FIP)
		return 0;
	if (!fip->sel_fcf)
		goto drop;

	switch (op) {
	case ELS_FLOGI:
		op = FIP_DT_FLOGI;
		break;
	case ELS_FDISC:
		if (ntoh24(fh->fh_s_id))
			return 0;
		op = FIP_DT_FDISC;
		break;
	case ELS_LOGO:
		if (fip->state != FIP_ST_ENABLED)
			return 0;
		if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
			return 0;
		op = FIP_DT_LOGO;
		break;
	case ELS_LS_ACC:
		if (fip->flogi_oxid == FC_XID_UNKNOWN)
			return 0;
		if (!ntoh24(fh->fh_s_id))
			return 0;
		if (fip->state == FIP_ST_AUTO)
			return 0;
		/*
		 * Here we must've gotten an SID by accepting an FLOGI
		 * from a point-to-point connection.  Switch to using
		 * the source mac based on the SID.  The destination
		 * MAC in this case would have been set by receving the
		 * FLOGI.
		 */
		fip->flogi_oxid = FC_XID_UNKNOWN;
		fc_fcoe_set_mac(mac, fh->fh_d_id);
		fip->update_mac(lport, mac);
		return 0;
	default:
		if (fip->state != FIP_ST_ENABLED)
			goto drop;
		return 0;
	}
	if (fcoe_ctlr_encaps(fip, lport, op, skb))
		goto drop;
	fip->send(fip, skb);
	return -EINPROGRESS;
drop:
	kfree_skb(skb);
	return -EINVAL;
}
EXPORT_SYMBOL(fcoe_ctlr_els_send);

/**
 * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller
 * @fip: The FCoE controller to free FCFs on
 *
 * Called with lock held and preemption disabled.
 *
 * An FCF is considered old if we have missed three advertisements.
 * That is, there have been no valid advertisement from it for three
 * times its keep-alive period including fuzz.
 *
 * In addition, determine the time when an FCF selection can occur.
 *
 * Also, increment the MissDiscAdvCount when no advertisement is received
 * for the corresponding FCF for 1.5 * FKA_ADV_PERIOD (FC-BB-5 LESB).
 */
static void fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
{
	struct fcoe_fcf *fcf;
	struct fcoe_fcf *next;
	unsigned long sel_time = 0;
	unsigned long mda_time = 0;
	struct fcoe_dev_stats *stats;

	list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
		mda_time = fcf->fka_period + (fcf->fka_period >> 1);
		if ((fip->sel_fcf == fcf) &&
		    (time_after(jiffies, fcf->time + mda_time))) {
			mod_timer(&fip->timer, jiffies + mda_time);
			stats = per_cpu_ptr(fip->lp->dev_stats,
					    smp_processor_id());
			stats->MissDiscAdvCount++;
			printk(KERN_INFO "libfcoe: host%d: Missing Discovery "
			       "Advertisement for fab %16.16llx count %lld\n",
			       fip->lp->host->host_no, fcf->fabric_name,
			       stats->MissDiscAdvCount);
		}
		if (time_after(jiffies, fcf->time + fcf->fka_period * 3 +
			       msecs_to_jiffies(FIP_FCF_FUZZ * 3))) {
			if (fip->sel_fcf == fcf)
				fip->sel_fcf = NULL;
			list_del(&fcf->list);
			WARN_ON(!fip->fcf_count);
			fip->fcf_count--;
			kfree(fcf);
			stats = per_cpu_ptr(fip->lp->dev_stats,
					    smp_processor_id());
			stats->VLinkFailureCount++;
		} else if (fcoe_ctlr_mtu_valid(fcf) &&
			   (!sel_time || time_before(sel_time, fcf->time))) {
			sel_time = fcf->time;
		}
	}
	if (sel_time) {
		sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY);
		fip->sel_time = sel_time;
		if (time_before(sel_time, fip->timer.expires))
			mod_timer(&fip->timer, sel_time);
	} else {
		fip->sel_time = 0;
	}
}

/**
 * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry
 * @fip: The FCoE controller receiving the advertisement
 * @skb: The received FIP advertisement frame
 * @fcf: The resulting FCF entry
 *
 * Returns zero on a valid parsed advertisement,
 * otherwise returns non zero value.
 */
static int fcoe_ctlr_parse_adv(struct fcoe_ctlr *fip,
			       struct sk_buff *skb, struct fcoe_fcf *fcf)
{
	struct fip_header *fiph;
	struct fip_desc *desc = NULL;
	struct fip_wwn_desc *wwn;
	struct fip_fab_desc *fab;
	struct fip_fka_desc *fka;
	unsigned long t;
	size_t rlen;
	size_t dlen;

	memset(fcf, 0, sizeof(*fcf));
	fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA);

	fiph = (struct fip_header *)skb->data;
	fcf->flags = ntohs(fiph->fip_flags);

	rlen = ntohs(fiph->fip_dl_len) * 4;
	if (rlen + sizeof(*fiph) > skb->len)
		return -EINVAL;

	desc = (struct fip_desc *)(fiph + 1);
	while (rlen > 0) {
		dlen = desc->fip_dlen * FIP_BPW;
		if (dlen < sizeof(*desc) || dlen > rlen)
			return -EINVAL;
		switch (desc->fip_dtype) {
		case FIP_DT_PRI:
			if (dlen != sizeof(struct fip_pri_desc))
				goto len_err;
			fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri;
			break;
		case FIP_DT_MAC:
			if (dlen != sizeof(struct fip_mac_desc))
				goto len_err;
			memcpy(fcf->fcf_mac,
			       ((struct fip_mac_desc *)desc)->fd_mac,
			       ETH_ALEN);
			if (!is_valid_ether_addr(fcf->fcf_mac)) {
				LIBFCOE_FIP_DBG(fip, "Invalid MAC address "
						"in FIP adv\n");
				return -EINVAL;
			}
			break;
		case FIP_DT_NAME:
			if (dlen != sizeof(struct fip_wwn_desc))
				goto len_err;
			wwn = (struct fip_wwn_desc *)desc;
			fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn);
			break;
		case FIP_DT_FAB:
			if (dlen != sizeof(struct fip_fab_desc))
				goto len_err;
			fab = (struct fip_fab_desc *)desc;
			fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn);
			fcf->vfid = ntohs(fab->fd_vfid);
			fcf->fc_map = ntoh24(fab->fd_map);
			break;
		case FIP_DT_FKA:
			if (dlen != sizeof(struct fip_fka_desc))
				goto len_err;
			fka = (struct fip_fka_desc *)desc;
			if (fka->fd_flags & FIP_FKA_ADV_D)
				fcf->fd_flags = 1;
			t = ntohl(fka->fd_fka_period);
			if (t >= FCOE_CTLR_MIN_FKA)
				fcf->fka_period = msecs_to_jiffies(t);
			break;
		case FIP_DT_MAP_OUI:
		case FIP_DT_FCOE_SIZE:
		case FIP_DT_FLOGI:
		case FIP_DT_FDISC:
		case FIP_DT_LOGO:
		case FIP_DT_ELP:
		default:
			LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
					"in FIP adv\n", desc->fip_dtype);
			/* standard says ignore unknown descriptors >= 128 */
			if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
				return -EINVAL;
			continue;
		}
		desc = (struct fip_desc *)((char *)desc + dlen);
		rlen -= dlen;
	}
	if (!fcf->fc_map || (fcf->fc_map & 0x10000))
		return -EINVAL;
	if (!fcf->switch_name || !fcf->fabric_name)
		return -EINVAL;
	return 0;

len_err:
	LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
			desc->fip_dtype, dlen);
	return -EINVAL;
}

/**
 * fcoe_ctlr_recv_adv() - Handle an incoming advertisement
 * @fip: The FCoE controller receiving the advertisement
 * @skb: The received FIP packet
 */
static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
	struct fcoe_fcf *fcf;
	struct fcoe_fcf new;
	struct fcoe_fcf *found;
	unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV);
	int first = 0;
	int mtu_valid;

	if (fcoe_ctlr_parse_adv(fip, skb, &new))
		return;

	spin_lock_bh(&fip->lock);
	first = list_empty(&fip->fcfs);
	found = NULL;
	list_for_each_entry(fcf, &fip->fcfs, list) {
		if (fcf->switch_name == new.switch_name &&
		    fcf->fabric_name == new.fabric_name &&
		    fcf->fc_map == new.fc_map &&
		    compare_ether_addr(fcf->fcf_mac, new.fcf_mac) == 0) {
			found = fcf;
			break;
		}
	}
	if (!found) {
		if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT)
			goto out;

		fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC);
		if (!fcf)
			goto out;

		fip->fcf_count++;
		memcpy(fcf, &new, sizeof(new));
		list_add(&fcf->list, &fip->fcfs);
	} else {
		/*
		 * Flags in advertisements are ignored once the FCF is
		 * selected.  Flags in unsolicited advertisements are
		 * ignored after a usable solicited advertisement
		 * has been received.
		 */
		if (fcf == fip->sel_fcf) {
			fip->ctlr_ka_time -= fcf->fka_period;
			fip->ctlr_ka_time += new.fka_period;
			if (time_before(fip->ctlr_ka_time, fip->timer.expires))
				mod_timer(&fip->timer, fip->ctlr_ka_time);
		} else if (!fcoe_ctlr_fcf_usable(fcf))
			fcf->flags = new.flags;
		fcf->fka_period = new.fka_period;
		memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN);
	}
	mtu_valid = fcoe_ctlr_mtu_valid(fcf);
	fcf->time = jiffies;
	if (!found) {
		LIBFCOE_FIP_DBG(fip, "New FCF for fab %16.16llx "
				"map %x val %d\n",
				fcf->fabric_name, fcf->fc_map, mtu_valid);
	}

	/*
	 * If this advertisement is not solicited and our max receive size
	 * hasn't been verified, send a solicited advertisement.
	 */
	if (!mtu_valid)
		fcoe_ctlr_solicit(fip, fcf);

	/*
	 * If its been a while since we did a solicit, and this is
	 * the first advertisement we've received, do a multicast
	 * solicitation to gather as many advertisements as we can
	 * before selection occurs.
	 */
	if (first && time_after(jiffies, fip->sol_time + sol_tov))
		fcoe_ctlr_solicit(fip, NULL);

	/*
	 * If this is the first validated FCF, note the time and
	 * set a timer to trigger selection.
	 */
	if (mtu_valid && !fip->sel_time && fcoe_ctlr_fcf_usable(fcf)) {
		fip->sel_time = jiffies +
			msecs_to_jiffies(FCOE_CTLR_START_DELAY);
		if (!timer_pending(&fip->timer) ||
		    time_before(fip->sel_time, fip->timer.expires))
			mod_timer(&fip->timer, fip->sel_time);
	}
out:
	spin_unlock_bh(&fip->lock);
}

/**
 * fcoe_ctlr_recv_els() - Handle an incoming FIP encapsulated ELS frame
 * @fip: The FCoE controller which received the packet
 * @skb: The received FIP packet
 */
static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
	struct fc_lport *lport = fip->lp;
	struct fip_header *fiph;
	struct fc_frame *fp = (struct fc_frame *)skb;
	struct fc_frame_header *fh = NULL;
	struct fip_desc *desc;
	struct fip_encaps *els;
	struct fcoe_dev_stats *stats;
	enum fip_desc_type els_dtype = 0;
	u8 els_op;
	u8 sub;
	u8 granted_mac[ETH_ALEN] = { 0 };
	size_t els_len = 0;
	size_t rlen;
	size_t dlen;

	fiph = (struct fip_header *)skb->data;
	sub = fiph->fip_subcode;
	if (sub != FIP_SC_REQ && sub != FIP_SC_REP)
		goto drop;

	rlen = ntohs(fiph->fip_dl_len) * 4;
	if (rlen + sizeof(*fiph) > skb->len)
		goto drop;

	desc = (struct fip_desc *)(fiph + 1);
	while (rlen > 0) {
		dlen = desc->fip_dlen * FIP_BPW;
		if (dlen < sizeof(*desc) || dlen > rlen)
			goto drop;
		switch (desc->fip_dtype) {
		case FIP_DT_MAC:
			if (dlen != sizeof(struct fip_mac_desc))
				goto len_err;
			memcpy(granted_mac,
			       ((struct fip_mac_desc *)desc)->fd_mac,
			       ETH_ALEN);
			if (!is_valid_ether_addr(granted_mac)) {
				LIBFCOE_FIP_DBG(fip, "Invalid MAC address "
						"in FIP ELS\n");
				goto drop;
			}
			memcpy(fr_cb(fp)->granted_mac, granted_mac, ETH_ALEN);
			break;
		case FIP_DT_FLOGI:
		case FIP_DT_FDISC:
		case FIP_DT_LOGO:
		case FIP_DT_ELP:
			if (fh)
				goto drop;
			if (dlen < sizeof(*els) + sizeof(*fh) + 1)
				goto len_err;
			els_len = dlen - sizeof(*els);
			els = (struct fip_encaps *)desc;
			fh = (struct fc_frame_header *)(els + 1);
			els_dtype = desc->fip_dtype;
			break;
		default:
			LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
					"in FIP adv\n", desc->fip_dtype);
			/* standard says ignore unknown descriptors >= 128 */
			if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
				goto drop;
			continue;
		}
		desc = (struct fip_desc *)((char *)desc + dlen);
		rlen -= dlen;
	}

	if (!fh)
		goto drop;
	els_op = *(u8 *)(fh + 1);

	if (els_dtype == FIP_DT_FLOGI && sub == FIP_SC_REP &&
	    fip->flogi_oxid == ntohs(fh->fh_ox_id) &&
	    els_op == ELS_LS_ACC && is_valid_ether_addr(granted_mac))
		fip->flogi_oxid = FC_XID_UNKNOWN;

	/*
	 * Convert skb into an fc_frame containing only the ELS.
	 */
	skb_pull(skb, (u8 *)fh - skb->data);
	skb_trim(skb, els_len);
	fp = (struct fc_frame *)skb;
	fc_frame_init(fp);
	fr_sof(fp) = FC_SOF_I3;
	fr_eof(fp) = FC_EOF_T;
	fr_dev(fp) = lport;

	stats = per_cpu_ptr(lport->dev_stats, get_cpu());
	stats->RxFrames++;
	stats->RxWords += skb->len / FIP_BPW;
	put_cpu();

	fc_exch_recv(lport, fp);
	return;

len_err:
	LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
			desc->fip_dtype, dlen);
drop:
	kfree_skb(skb);
}

/**
 * fcoe_ctlr_recv_els() - Handle an incoming link reset frame
 * @fip: The FCoE controller that received the frame
 * @fh:	 The received FIP header
 *
 * There may be multiple VN_Port descriptors.
 * The overall length has already been checked.
 */
static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
				     struct fip_header *fh)
{
	struct fip_desc *desc;
	struct fip_mac_desc *mp;
	struct fip_wwn_desc *wp;
	struct fip_vn_desc *vp;
	size_t rlen;
	size_t dlen;
	struct fcoe_fcf *fcf = fip->sel_fcf;
	struct fc_lport *lport = fip->lp;
	u32	desc_mask;

	LIBFCOE_FIP_DBG(fip, "Clear Virtual Link received\n");

	if (!fcf || !lport->port_id)
		return;

	/*
	 * mask of required descriptors.  Validating each one clears its bit.
	 */
	desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | BIT(FIP_DT_VN_ID);

	rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
	desc = (struct fip_desc *)(fh + 1);
	while (rlen >= sizeof(*desc)) {
		dlen = desc->fip_dlen * FIP_BPW;
		if (dlen > rlen)
			return;
		switch (desc->fip_dtype) {
		case FIP_DT_MAC:
			mp = (struct fip_mac_desc *)desc;
			if (dlen < sizeof(*mp))
				return;
			if (compare_ether_addr(mp->fd_mac, fcf->fcf_mac))
				return;
			desc_mask &= ~BIT(FIP_DT_MAC);
			break;
		case FIP_DT_NAME:
			wp = (struct fip_wwn_desc *)desc;
			if (dlen < sizeof(*wp))
				return;
			if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
				return;
			desc_mask &= ~BIT(FIP_DT_NAME);
			break;
		case FIP_DT_VN_ID:
			vp = (struct fip_vn_desc *)desc;
			if (dlen < sizeof(*vp))
				return;
			if (compare_ether_addr(vp->fd_mac,
					       fip->get_src_addr(lport)) == 0 &&
			    get_unaligned_be64(&vp->fd_wwpn) == lport->wwpn &&
			    ntoh24(vp->fd_fc_id) == lport->port_id)
				desc_mask &= ~BIT(FIP_DT_VN_ID);
			break;
		default:
			/* standard says ignore unknown descriptors >= 128 */
			if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
				return;
			break;
		}
		desc = (struct fip_desc *)((char *)desc + dlen);
		rlen -= dlen;
	}

	/*
	 * reset only if all required descriptors were present and valid.
	 */
	if (desc_mask) {
		LIBFCOE_FIP_DBG(fip, "missing descriptors mask %x\n",
				desc_mask);
	} else {
		LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n");

		spin_lock_bh(&fip->lock);
		per_cpu_ptr(lport->dev_stats,
			    smp_processor_id())->VLinkFailureCount++;
		fcoe_ctlr_reset(fip);
		spin_unlock_bh(&fip->lock);

		fc_lport_reset(fip->lp);
		fcoe_ctlr_solicit(fip, NULL);
	}
}

/**
 * fcoe_ctlr_recv() - Receive a FIP packet
 * @fip: The FCoE controller that received the packet
 * @skb: The received FIP packet
 *
 * This may be called from either NET_RX_SOFTIRQ or IRQ.
 */
void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
	skb_queue_tail(&fip->fip_recv_list, skb);
	schedule_work(&fip->recv_work);
}
EXPORT_SYMBOL(fcoe_ctlr_recv);

/**
 * fcoe_ctlr_recv_handler() - Receive a FIP frame
 * @fip: The FCoE controller that received the frame
 * @skb: The received FIP frame
 *
 * Returns non-zero if the frame is dropped.
 */
static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
	struct fip_header *fiph;
	struct ethhdr *eh;
	enum fip_state state;
	u16 op;
	u8 sub;

	if (skb_linearize(skb))
		goto drop;
	if (skb->len < sizeof(*fiph))
		goto drop;
	eh = eth_hdr(skb);
	if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) &&
	    compare_ether_addr(eh->h_dest, FIP_ALL_ENODE_MACS))
		goto drop;
	fiph = (struct fip_header *)skb->data;
	op = ntohs(fiph->fip_op);
	sub = fiph->fip_subcode;

	if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
		goto drop;
	if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
		goto drop;

	spin_lock_bh(&fip->lock);
	state = fip->state;
	if (state == FIP_ST_AUTO) {
		fip->map_dest = 0;
		fip->state = FIP_ST_ENABLED;
		state = FIP_ST_ENABLED;
		LIBFCOE_FIP_DBG(fip, "Using FIP mode\n");
	}
	spin_unlock_bh(&fip->lock);
	if (state != FIP_ST_ENABLED)
		goto drop;

	if (op == FIP_OP_LS) {
		fcoe_ctlr_recv_els(fip, skb);	/* consumes skb */
		return 0;
	}
	if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
		fcoe_ctlr_recv_adv(fip, skb);
	else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
		fcoe_ctlr_recv_clr_vlink(fip, fiph);
	kfree_skb(skb);
	return 0;
drop:
	kfree_skb(skb);
	return -1;
}

/**
 * fcoe_ctlr_select() - Select the best FCF (if possible)
 * @fip: The FCoE controller
 *
 * If there are conflicting advertisements, no FCF can be chosen.
 *
 * Called with lock held.
 */
static void fcoe_ctlr_select(struct fcoe_ctlr *fip)
{
	struct fcoe_fcf *fcf;
	struct fcoe_fcf *best = NULL;

	list_for_each_entry(fcf, &fip->fcfs, list) {
		LIBFCOE_FIP_DBG(fip, "consider FCF for fab %16.16llx "
				"VFID %d map %x val %d\n",
				fcf->fabric_name, fcf->vfid,
				fcf->fc_map, fcoe_ctlr_mtu_valid(fcf));
		if (!fcoe_ctlr_fcf_usable(fcf)) {
			LIBFCOE_FIP_DBG(fip, "FCF for fab %16.16llx "
					"map %x %svalid %savailable\n",
					fcf->fabric_name, fcf->fc_map,
					(fcf->flags & FIP_FL_SOL) ? "" : "in",
					(fcf->flags & FIP_FL_AVAIL) ?
					"" : "un");
			continue;
		}
		if (!best) {
			best = fcf;
			continue;
		}
		if (fcf->fabric_name != best->fabric_name ||
		    fcf->vfid != best->vfid ||
		    fcf->fc_map != best->fc_map) {
			LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, "
					"or FC-MAP\n");
			return;
		}
		if (fcf->pri < best->pri)
			best = fcf;
	}
	fip->sel_fcf = best;
}

/**
 * fcoe_ctlr_timeout() - FIP timeout handler
 * @arg: The FCoE controller that timed out
 *
 * Ages FCFs.  Triggers FCF selection if possible.  Sends keep-alives.
 */
static void fcoe_ctlr_timeout(unsigned long arg)
{
	struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg;
	struct fcoe_fcf *sel;
	struct fcoe_fcf *fcf;
	unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD);

	spin_lock_bh(&fip->lock);
	if (fip->state == FIP_ST_DISABLED) {
		spin_unlock_bh(&fip->lock);
		return;
	}

	fcf = fip->sel_fcf;
	fcoe_ctlr_age_fcfs(fip);

	sel = fip->sel_fcf;
	if (!sel && fip->sel_time && time_after_eq(jiffies, fip->sel_time)) {
		fcoe_ctlr_select(fip);
		sel = fip->sel_fcf;
		fip->sel_time = 0;
	}

	if (sel != fcf) {
		fcf = sel;		/* the old FCF may have been freed */
		if (sel) {
			printk(KERN_INFO "libfcoe: host%d: FIP selected "
			       "Fibre-Channel Forwarder MAC %pM\n",
			       fip->lp->host->host_no, sel->fcf_mac);
			memcpy(fip->dest_addr, sel->fcf_mac, ETH_ALEN);
			fip->port_ka_time = jiffies +
				msecs_to_jiffies(FIP_VN_KA_PERIOD);
			fip->ctlr_ka_time = jiffies + sel->fka_period;
		} else {
			printk(KERN_NOTICE "libfcoe: host%d: "
			       "FIP Fibre-Channel Forwarder timed out.	"
			       "Starting FCF discovery.\n",
			       fip->lp->host->host_no);
			fip->reset_req = 1;
			schedule_work(&fip->timer_work);
		}
	}

	if (sel && !sel->fd_flags) {
		if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
			fip->ctlr_ka_time = jiffies + sel->fka_period;
			fip->send_ctlr_ka = 1;
		}
		if (time_after(next_timer, fip->ctlr_ka_time))
			next_timer = fip->ctlr_ka_time;

		if (time_after_eq(jiffies, fip->port_ka_time)) {
			fip->port_ka_time = jiffies +
				msecs_to_jiffies(FIP_VN_KA_PERIOD);
			fip->send_port_ka = 1;
		}
		if (time_after(next_timer, fip->port_ka_time))
			next_timer = fip->port_ka_time;
		mod_timer(&fip->timer, next_timer);
	} else if (fip->sel_time) {
		next_timer = fip->sel_time +
			msecs_to_jiffies(FCOE_CTLR_START_DELAY);
		mod_timer(&fip->timer, next_timer);
	}
	if (fip->send_ctlr_ka || fip->send_port_ka)
		schedule_work(&fip->timer_work);
	spin_unlock_bh(&fip->lock);
}

/**
 * fcoe_ctlr_timer_work() - Worker thread function for timer work
 * @work: Handle to a FCoE controller
 *
 * Sends keep-alives and resets which must not
 * be called from the timer directly, since they use a mutex.
 */
static void fcoe_ctlr_timer_work(struct work_struct *work)
{
	struct fcoe_ctlr *fip;
	struct fc_lport *vport;
	u8 *mac;
	int reset;

	fip = container_of(work, struct fcoe_ctlr, timer_work);
	spin_lock_bh(&fip->lock);
	reset = fip->reset_req;
	fip->reset_req = 0;
	spin_unlock_bh(&fip->lock);

	if (reset)
		fc_lport_reset(fip->lp);

	if (fip->send_ctlr_ka) {
		fip->send_ctlr_ka = 0;
		fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr);
	}
	if (fip->send_port_ka) {
		fip->send_port_ka = 0;
		mutex_lock(&fip->lp->lp_mutex);
		mac = fip->get_src_addr(fip->lp);
		fcoe_ctlr_send_keep_alive(fip, fip->lp, 1, mac);
		list_for_each_entry(vport, &fip->lp->vports, list) {
			mac = fip->get_src_addr(vport);
			fcoe_ctlr_send_keep_alive(fip, vport, 1, mac);
		}
		mutex_unlock(&fip->lp->lp_mutex);
	}
}

/**
 * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames
 * @recv_work: Handle to a FCoE controller
 */
static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
{
	struct fcoe_ctlr *fip;
	struct sk_buff *skb;

	fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
	while ((skb = skb_dequeue(&fip->fip_recv_list)))
		fcoe_ctlr_recv_handler(fip, skb);
}

/**
 * fcoe_ctlr_recv_flogi() - Snoop pre-FIP receipt of FLOGI response
 * @fip: The FCoE controller
 * @fp:	 The FC frame to snoop
 *
 * Snoop potential response to FLOGI or even incoming FLOGI.
 *
 * The caller has checked that we are waiting for login as indicated
 * by fip->flogi_oxid != FC_XID_UNKNOWN.
 *
 * The caller is responsible for freeing the frame.
 * Fill in the granted_mac address.
 *
 * Return non-zero if the frame should not be delivered to libfc.
 */
int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_lport *lport,
			 struct fc_frame *fp)
{
	struct fc_frame_header *fh;
	u8 op;
	u8 *sa;

	sa = eth_hdr(&fp->skb)->h_source;
	fh = fc_frame_header_get(fp);
	if (fh->fh_type != FC_TYPE_ELS)
		return 0;

	op = fc_frame_payload_op(fp);
	if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
	    fip->flogi_oxid == ntohs(fh->fh_ox_id)) {

		spin_lock_bh(&fip->lock);
		if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
			spin_unlock_bh(&fip->lock);
			return -EINVAL;
		}
		fip->state = FIP_ST_NON_FIP;
		LIBFCOE_FIP_DBG(fip,
				"received FLOGI LS_ACC using non-FIP mode\n");

		/*
		 * FLOGI accepted.
		 * If the src mac addr is FC_OUI-based, then we mark the
		 * address_mode flag to use FC_OUI-based Ethernet DA.
		 * Otherwise we use the FCoE gateway addr
		 */
		if (!compare_ether_addr(sa, (u8[6])FC_FCOE_FLOGI_MAC)) {
			fip->map_dest = 1;
		} else {
			memcpy(fip->dest_addr, sa, ETH_ALEN);
			fip->map_dest = 0;
		}
		fip->flogi_oxid = FC_XID_UNKNOWN;
		spin_unlock_bh(&fip->lock);
		fc_fcoe_set_mac(fr_cb(fp)->granted_mac, fh->fh_d_id);
	} else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
		/*
		 * Save source MAC for point-to-point responses.
		 */
		spin_lock_bh(&fip->lock);
		if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
			memcpy(fip->dest_addr, sa, ETH_ALEN);
			fip->map_dest = 0;
			if (fip->state == FIP_ST_AUTO)
				LIBFCOE_FIP_DBG(fip, "received non-FIP FLOGI. "
						"Setting non-FIP mode\n");
			fip->state = FIP_ST_NON_FIP;
		}
		spin_unlock_bh(&fip->lock);
	}
	return 0;
}
EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);

/**
 * fcoe_wwn_from_mac() - Converts a 48-bit IEEE MAC address to a 64-bit FC WWN
 * @mac:    The MAC address to convert
 * @scheme: The scheme to use when converting
 * @port:   The port indicator for converting
 *
 * Returns: u64 fc world wide name
 */
u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
		      unsigned int scheme, unsigned int port)
{
	u64 wwn;
	u64 host_mac;

	/* The MAC is in NO, so flip only the low 48 bits */
	host_mac = ((u64) mac[0] << 40) |
		((u64) mac[1] << 32) |
		((u64) mac[2] << 24) |
		((u64) mac[3] << 16) |
		((u64) mac[4] << 8) |
		(u64) mac[5];

	WARN_ON(host_mac >= (1ULL << 48));
	wwn = host_mac | ((u64) scheme << 60);
	switch (scheme) {
	case 1:
		WARN_ON(port != 0);
		break;
	case 2:
		WARN_ON(port >= 0xfff);
		wwn |= (u64) port << 48;
		break;
	default:
		WARN_ON(1);
		break;
	}

	return wwn;
}
EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);

/**
 * fcoe_libfc_config() - Sets up libfc related properties for local port
 * @lp: The local port to configure libfc for
 * @tt: The libfc function template
 *
 * Returns : 0 for success
 */
int fcoe_libfc_config(struct fc_lport *lport,
		      struct libfc_function_template *tt)
{
	/* Set the function pointers set by the LLDD */
	memcpy(&lport->tt, tt, sizeof(*tt));
	if (fc_fcp_init(lport))
		return -ENOMEM;
	fc_exch_init(lport);
	fc_elsct_init(lport);
	fc_lport_init(lport);
	fc_rport_init(lport);
	fc_disc_init(lport);

	return 0;
}
EXPORT_SYMBOL_GPL(fcoe_libfc_config);