summaryrefslogtreecommitdiff
path: root/drivers/scsi/cxgbi/cxgb3i/cxgb3i.c
blob: 1242c7c04a01a712859de3bb2ff20d2a82525608 (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
/*
 * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
 *
 * Copyright (C) 2003-2008 Chelsio Communications.  All rights reserved.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the LICENSE file included in this
 * release for licensing terms and conditions.
 *
 * Written by:	Dimitris Michailidis (dm@chelsio.com)
 *		Karen Xie (kxie@chelsio.com)
 */

#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <scsi/scsi_host.h>

#include "common.h"
#include "t3_cpl.h"
#include "t3cdev.h"
#include "cxgb3_defs.h"
#include "cxgb3_ctl_defs.h"
#include "cxgb3_offload.h"
#include "firmware_exports.h"
#include "cxgb3i.h"

static unsigned int dbg_level;
#include "../libcxgbi.h"

#define DRV_MODULE_NAME         "cxgb3i"
#define DRV_MODULE_DESC         "Chelsio T3 iSCSI Driver"
#define DRV_MODULE_VERSION	"2.0.0"
#define DRV_MODULE_RELDATE	"Jun. 2010"

static char version[] =
	DRV_MODULE_DESC " " DRV_MODULE_NAME
	" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";

MODULE_AUTHOR("Chelsio Communications, Inc.");
MODULE_DESCRIPTION(DRV_MODULE_DESC);
MODULE_VERSION(DRV_MODULE_VERSION);
MODULE_LICENSE("GPL");

module_param(dbg_level, uint, 0644);
MODULE_PARM_DESC(dbg_level, "debug flag (default=0)");

static int cxgb3i_rcv_win = 256 * 1024;
module_param(cxgb3i_rcv_win, int, 0644);
MODULE_PARM_DESC(cxgb3i_rcv_win, "TCP receive window in bytes (default=256KB)");

static int cxgb3i_snd_win = 128 * 1024;
module_param(cxgb3i_snd_win, int, 0644);
MODULE_PARM_DESC(cxgb3i_snd_win, "TCP send window in bytes (default=128KB)");

static int cxgb3i_rx_credit_thres = 10 * 1024;
module_param(cxgb3i_rx_credit_thres, int, 0644);
MODULE_PARM_DESC(rx_credit_thres,
		 "RX credits return threshold in bytes (default=10KB)");

static unsigned int cxgb3i_max_connect = 8 * 1024;
module_param(cxgb3i_max_connect, uint, 0644);
MODULE_PARM_DESC(cxgb3i_max_connect, "Max. # of connections (default=8092)");

static unsigned int cxgb3i_sport_base = 20000;
module_param(cxgb3i_sport_base, uint, 0644);
MODULE_PARM_DESC(cxgb3i_sport_base, "starting port number (default=20000)");

static void cxgb3i_dev_open(struct t3cdev *);
static void cxgb3i_dev_close(struct t3cdev *);
static void cxgb3i_dev_event_handler(struct t3cdev *, u32, u32);

static struct cxgb3_client t3_client = {
	.name = DRV_MODULE_NAME,
	.handlers = cxgb3i_cpl_handlers,
	.add = cxgb3i_dev_open,
	.remove = cxgb3i_dev_close,
	.event_handler = cxgb3i_dev_event_handler,
};

static struct scsi_host_template cxgb3i_host_template = {
	.module		= THIS_MODULE,
	.name		= DRV_MODULE_NAME,
	.proc_name	= DRV_MODULE_NAME,
	.can_queue	= CXGB3I_SCSI_HOST_QDEPTH,
	.queuecommand	= iscsi_queuecommand,
	.change_queue_depth = iscsi_change_queue_depth,
	.sg_tablesize	= SG_ALL,
	.max_sectors	= 0xFFFF,
	.cmd_per_lun	= ISCSI_DEF_CMD_PER_LUN,
	.eh_abort_handler = iscsi_eh_abort,
	.eh_device_reset_handler = iscsi_eh_device_reset,
	.eh_target_reset_handler = iscsi_eh_recover_target,
	.target_alloc	= iscsi_target_alloc,
	.use_clustering	= DISABLE_CLUSTERING,
	.this_id	= -1,
};

static struct iscsi_transport cxgb3i_iscsi_transport = {
	.owner		= THIS_MODULE,
	.name		= DRV_MODULE_NAME,
	/* owner and name should be set already */
	.caps		= CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
				| CAP_DATADGST | CAP_DIGEST_OFFLOAD |
				CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
	.param_mask	= ISCSI_MAX_RECV_DLENGTH | ISCSI_MAX_XMIT_DLENGTH |
				ISCSI_HDRDGST_EN | ISCSI_DATADGST_EN |
				ISCSI_INITIAL_R2T_EN | ISCSI_MAX_R2T |
				ISCSI_IMM_DATA_EN | ISCSI_FIRST_BURST |
				ISCSI_MAX_BURST | ISCSI_PDU_INORDER_EN |
				ISCSI_DATASEQ_INORDER_EN | ISCSI_ERL |
				ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
				ISCSI_EXP_STATSN | ISCSI_PERSISTENT_PORT |
				ISCSI_PERSISTENT_ADDRESS |
				ISCSI_TARGET_NAME | ISCSI_TPGT |
				ISCSI_USERNAME | ISCSI_PASSWORD |
				ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
				ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
				ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
				ISCSI_PING_TMO | ISCSI_RECV_TMO |
				ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
	.host_param_mask	= ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
				ISCSI_HOST_INITIATOR_NAME |
				ISCSI_HOST_NETDEV_NAME,
	.get_host_param	= cxgbi_get_host_param,
	.set_host_param	= cxgbi_set_host_param,
	/* session management */
	.create_session	= cxgbi_create_session,
	.destroy_session	= cxgbi_destroy_session,
	.get_session_param = iscsi_session_get_param,
	/* connection management */
	.create_conn	= cxgbi_create_conn,
	.bind_conn	= cxgbi_bind_conn,
	.destroy_conn	= iscsi_tcp_conn_teardown,
	.start_conn	= iscsi_conn_start,
	.stop_conn	= iscsi_conn_stop,
	.get_conn_param	= iscsi_conn_get_param,
	.set_param	= cxgbi_set_conn_param,
	.get_stats	= cxgbi_get_conn_stats,
	/* pdu xmit req from user space */
	.send_pdu	= iscsi_conn_send_pdu,
	/* task */
	.init_task	= iscsi_tcp_task_init,
	.xmit_task	= iscsi_tcp_task_xmit,
	.cleanup_task	= cxgbi_cleanup_task,
	/* pdu */
	.alloc_pdu	= cxgbi_conn_alloc_pdu,
	.init_pdu	= cxgbi_conn_init_pdu,
	.xmit_pdu	= cxgbi_conn_xmit_pdu,
	.parse_pdu_itt	= cxgbi_parse_pdu_itt,
	/* TCP connect/disconnect */
	.get_ep_param	= cxgbi_get_ep_param,
	.ep_connect	= cxgbi_ep_connect,
	.ep_poll	= cxgbi_ep_poll,
	.ep_disconnect	= cxgbi_ep_disconnect,
	/* Error recovery timeout call */
	.session_recovery_timedout = iscsi_session_recovery_timedout,
};

static struct scsi_transport_template *cxgb3i_stt;

/*
 * CPL (Chelsio Protocol Language) defines a message passing interface between
 * the host driver and Chelsio asic.
 * The section below implments CPLs that related to iscsi tcp connection
 * open/close/abort and data send/receive.
 */

static int push_tx_frames(struct cxgbi_sock *csk, int req_completion);

static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
			      const struct l2t_entry *e)
{
	unsigned int wscale = cxgbi_sock_compute_wscale(cxgb3i_rcv_win);
	struct cpl_act_open_req *req = (struct cpl_act_open_req *)skb->head;

	skb->priority = CPL_PRIORITY_SETUP;

	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, csk->atid));
	req->local_port = csk->saddr.sin_port;
	req->peer_port = csk->daddr.sin_port;
	req->local_ip = csk->saddr.sin_addr.s_addr;
	req->peer_ip = csk->daddr.sin_addr.s_addr;

	req->opt0h = htonl(V_KEEP_ALIVE(1) | F_TCAM_BYPASS |
			V_WND_SCALE(wscale) | V_MSS_IDX(csk->mss_idx) |
			V_L2T_IDX(e->idx) | V_TX_CHANNEL(e->smt_idx));
	req->opt0l = htonl(V_ULP_MODE(ULP2_MODE_ISCSI) |
			V_RCV_BUFSIZ(cxgb3i_rcv_win>>10));

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u, %pI4:%u-%pI4:%u, %u,%u,%u.\n",
		csk, csk->state, csk->flags, csk->atid,
		&req->local_ip, ntohs(req->local_port),
		&req->peer_ip, ntohs(req->peer_port),
		csk->mss_idx, e->idx, e->smt_idx);

	l2t_send(csk->cdev->lldev, skb, csk->l2t);
}

static inline void act_open_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
{
	cxgbi_sock_act_open_req_arp_failure(NULL, skb);
}

/*
 * CPL connection close request: host ->
 *
 * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
 * the write queue (i.e., after any unsent txt data).
 */
static void send_close_req(struct cxgbi_sock *csk)
{
	struct sk_buff *skb = csk->cpl_close;
	struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
	unsigned int tid = csk->tid;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u.\n",
		csk, csk->state, csk->flags, csk->tid);

	csk->cpl_close = NULL;
	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
	req->wr.wr_lo = htonl(V_WR_TID(tid));
	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
	req->rsvd = htonl(csk->write_seq);

	cxgbi_sock_skb_entail(csk, skb);
	if (csk->state >= CTP_ESTABLISHED)
		push_tx_frames(csk, 1);
}

/*
 * CPL connection abort request: host ->
 *
 * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
 * for the same connection and also that we do not try to send a message
 * after the connection has closed.
 */
static void abort_arp_failure(struct t3cdev *tdev, struct sk_buff *skb)
{
	struct cpl_abort_req *req = cplhdr(skb);

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"t3dev 0x%p, tid %u, skb 0x%p.\n",
		tdev, GET_TID(req), skb);
	req->cmd = CPL_ABORT_NO_RST;
	cxgb3_ofld_send(tdev, skb);
}

static void send_abort_req(struct cxgbi_sock *csk)
{
	struct sk_buff *skb = csk->cpl_abort_req;
	struct cpl_abort_req *req;

	if (unlikely(csk->state == CTP_ABORTING || !skb))
		return;
	cxgbi_sock_set_state(csk, CTP_ABORTING);
	cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
	/* Purge the send queue so we don't send anything after an abort. */
	cxgbi_sock_purge_write_queue(csk);

	csk->cpl_abort_req = NULL;
	req = (struct cpl_abort_req *)skb->head;
	skb->priority = CPL_PRIORITY_DATA;
	set_arp_failure_handler(skb, abort_arp_failure);
	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
	req->wr.wr_lo = htonl(V_WR_TID(csk->tid));
	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
	req->rsvd0 = htonl(csk->snd_nxt);
	req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
	req->cmd = CPL_ABORT_SEND_RST;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
		csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
		req->rsvd1);

	l2t_send(csk->cdev->lldev, skb, csk->l2t);
}

/*
 * CPL connection abort reply: host ->
 *
 * Send an ABORT_RPL message in response of the ABORT_REQ received.
 */
static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
{
	struct sk_buff *skb = csk->cpl_abort_rpl;
	struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u, status %d.\n",
		csk, csk->state, csk->flags, csk->tid, rst_status);

	csk->cpl_abort_rpl = NULL;
	skb->priority = CPL_PRIORITY_DATA;
	rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
	rpl->wr.wr_lo = htonl(V_WR_TID(csk->tid));
	OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
	rpl->cmd = rst_status;
	cxgb3_ofld_send(csk->cdev->lldev, skb);
}

/*
 * CPL connection rx data ack: host ->
 * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 * credits sent.
 */
static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
{
	struct sk_buff *skb;
	struct cpl_rx_data_ack *req;
	u32 dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
		"csk 0x%p,%u,0x%lx,%u, credit %u, dack %u.\n",
		csk, csk->state, csk->flags, csk->tid, credits, dack);

	skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
	if (!skb) {
		pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
		return 0;
	}
	req = (struct cpl_rx_data_ack *)skb->head;
	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, csk->tid));
	req->credit_dack = htonl(F_RX_DACK_CHANGE | V_RX_DACK_MODE(1) |
				V_RX_CREDITS(credits));
	skb->priority = CPL_PRIORITY_ACK;
	cxgb3_ofld_send(csk->cdev->lldev, skb);
	return credits;
}

/*
 * CPL connection tx data: host ->
 *
 * Send iscsi PDU via TX_DATA CPL message. Returns the number of
 * credits sent.
 * Each TX_DATA consumes work request credit (wrs), so we need to keep track of
 * how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
 */

static unsigned int wrlen __read_mostly;
static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;

static void init_wr_tab(unsigned int wr_len)
{
	int i;

	if (skb_wrs[1])		/* already initialized */
		return;
	for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
		int sgl_len = (3 * i) / 2 + (i & 1);

		sgl_len += 3;
		skb_wrs[i] = (sgl_len <= wr_len
			      ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
	}
	wrlen = wr_len * 8;
}

static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
				   int len, int req_completion)
{
	struct tx_data_wr *req;
	struct l2t_entry *l2t = csk->l2t;

	skb_reset_transport_header(skb);
	req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req));
	req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
			(req_completion ? F_WR_COMPL : 0));
	req->wr_lo = htonl(V_WR_TID(csk->tid));
	/* len includes the length of any HW ULP additions */
	req->len = htonl(len);
	/* V_TX_ULP_SUBMODE sets both the mode and submode */
	req->flags = htonl(V_TX_ULP_SUBMODE(cxgbi_skcb_ulp_mode(skb)) |
			   V_TX_SHOVE((skb_peek(&csk->write_queue) ? 0 : 1)));
	req->sndseq = htonl(csk->snd_nxt);
	req->param = htonl(V_TX_PORT(l2t->smt_idx));

	if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
		req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
				    V_TX_CPU_IDX(csk->rss_qid));
		/* sendbuffer is in units of 32KB. */
		req->param |= htonl(V_TX_SNDBUF(cxgb3i_snd_win >> 15));
		cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
	}
}

/**
 * push_tx_frames -- start transmit
 * @c3cn: the offloaded connection
 * @req_completion: request wr_ack or not
 *
 * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
 * connection's send queue and sends them on to T3.  Must be called with the
 * connection's lock held.  Returns the amount of send buffer space that was
 * freed as a result of sending queued data to T3.
 */

static void arp_failure_skb_discard(struct t3cdev *dev, struct sk_buff *skb)
{
	kfree_skb(skb);
}

static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
{
	int total_size = 0;
	struct sk_buff *skb;

	if (unlikely(csk->state < CTP_ESTABLISHED ||
		csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
			log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
				"csk 0x%p,%u,0x%lx,%u, in closing state.\n",
				csk, csk->state, csk->flags, csk->tid);
		return 0;
	}

	while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
		int len = skb->len;	/* length before skb_push */
		int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
		int wrs_needed = skb_wrs[frags];

		if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
			wrs_needed = 1;

		WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);

		if (csk->wr_cred < wrs_needed) {
			log_debug(1 << CXGBI_DBG_PDU_TX,
				"csk 0x%p, skb len %u/%u, frag %u, wr %d<%u.\n",
				csk, skb->len, skb->data_len, frags,
				wrs_needed, csk->wr_cred);
			break;
		}

		__skb_unlink(skb, &csk->write_queue);
		skb->priority = CPL_PRIORITY_DATA;
		skb->csum = wrs_needed;	/* remember this until the WR_ACK */
		csk->wr_cred -= wrs_needed;
		csk->wr_una_cred += wrs_needed;
		cxgbi_sock_enqueue_wr(csk, skb);

		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
			"csk 0x%p, enqueue, skb len %u/%u, frag %u, wr %d, "
			"left %u, unack %u.\n",
			csk, skb->len, skb->data_len, frags, skb->csum,
			csk->wr_cred, csk->wr_una_cred);

		if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
			if ((req_completion &&
				csk->wr_una_cred == wrs_needed) ||
			     csk->wr_una_cred >= csk->wr_max_cred / 2) {
				req_completion = 1;
				csk->wr_una_cred = 0;
			}
			len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
			make_tx_data_wr(csk, skb, len, req_completion);
			csk->snd_nxt += len;
			cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
		}
		total_size += skb->truesize;
		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
			"csk 0x%p, tid 0x%x, send skb 0x%p.\n",
			csk, csk->tid, skb);
		set_arp_failure_handler(skb, arp_failure_skb_discard);
		l2t_send(csk->cdev->lldev, skb, csk->l2t);
	}
	return total_size;
}

/*
 * Process a CPL_ACT_ESTABLISH message: -> host
 * Updates connection state from an active establish CPL message.  Runs with
 * the connection lock held.
 */

static inline void free_atid(struct cxgbi_sock *csk)
{
	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
		cxgb3_free_atid(csk->cdev->lldev, csk->atid);
		cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
		cxgbi_sock_put(csk);
	}
}

static int do_act_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
	struct cxgbi_sock *csk = ctx;
	struct cpl_act_establish *req = cplhdr(skb);
	unsigned int tid = GET_TID(req);
	unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
	u32 rcv_isn = ntohl(req->rcv_isn);	/* real RCV_ISN + 1 */

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"atid 0x%x,tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
		atid, atid, csk, csk->state, csk->flags, rcv_isn);

	cxgbi_sock_get(csk);
	cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
	csk->tid = tid;
	cxgb3_insert_tid(csk->cdev->lldev, &t3_client, csk, tid);

	free_atid(csk);

	csk->rss_qid = G_QNUM(ntohs(skb->csum));

	spin_lock_bh(&csk->lock);
	if (csk->retry_timer.function) {
		del_timer(&csk->retry_timer);
		csk->retry_timer.function = NULL;
	}

	if (unlikely(csk->state != CTP_ACTIVE_OPEN))
		pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
			csk, csk->state, csk->flags, csk->tid);

	csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
	if (cxgb3i_rcv_win > (M_RCV_BUFSIZ << 10))
		csk->rcv_wup -= cxgb3i_rcv_win - (M_RCV_BUFSIZ << 10);

	cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));

	if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
		/* upper layer has requested closing */
		send_abort_req(csk);
	else {
		if (skb_queue_len(&csk->write_queue))
			push_tx_frames(csk, 1);
		cxgbi_conn_tx_open(csk);
	}

	spin_unlock_bh(&csk->lock);
	__kfree_skb(skb);
	return 0;
}

/*
 * Process a CPL_ACT_OPEN_RPL message: -> host
 * Handle active open failures.
 */
static int act_open_rpl_status_to_errno(int status)
{
	switch (status) {
	case CPL_ERR_CONN_RESET:
		return -ECONNREFUSED;
	case CPL_ERR_ARP_MISS:
		return -EHOSTUNREACH;
	case CPL_ERR_CONN_TIMEDOUT:
		return -ETIMEDOUT;
	case CPL_ERR_TCAM_FULL:
		return -ENOMEM;
	case CPL_ERR_CONN_EXIST:
		return -EADDRINUSE;
	default:
		return -EIO;
	}
}

static void act_open_retry_timer(unsigned long data)
{
	struct sk_buff *skb;
	struct cxgbi_sock *csk = (struct cxgbi_sock *)data;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u.\n",
		csk, csk->state, csk->flags, csk->tid);

	cxgbi_sock_get(csk);
	spin_lock_bh(&csk->lock);
	skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
	if (!skb)
		cxgbi_sock_fail_act_open(csk, -ENOMEM);
	else {
		skb->sk = (struct sock *)csk;
		set_arp_failure_handler(skb, act_open_arp_failure);
		send_act_open_req(csk, skb, csk->l2t);
	}
	spin_unlock_bh(&csk->lock);
	cxgbi_sock_put(csk);
}

static int do_act_open_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
{
	struct cxgbi_sock *csk = ctx;
	struct cpl_act_open_rpl *rpl = cplhdr(skb);

	pr_info("csk 0x%p,%u,0x%lx,%u, status %u, %pI4:%u-%pI4:%u.\n",
		csk, csk->state, csk->flags, csk->atid, rpl->status,
		&csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
		&csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));

	if (rpl->status != CPL_ERR_TCAM_FULL &&
	    rpl->status != CPL_ERR_CONN_EXIST &&
	    rpl->status != CPL_ERR_ARP_MISS)
		cxgb3_queue_tid_release(tdev, GET_TID(rpl));

	cxgbi_sock_get(csk);
	spin_lock_bh(&csk->lock);
	if (rpl->status == CPL_ERR_CONN_EXIST &&
	    csk->retry_timer.function != act_open_retry_timer) {
		csk->retry_timer.function = act_open_retry_timer;
		mod_timer(&csk->retry_timer, jiffies + HZ / 2);
	} else
		cxgbi_sock_fail_act_open(csk,
				act_open_rpl_status_to_errno(rpl->status));

	spin_unlock_bh(&csk->lock);
	cxgbi_sock_put(csk);
	__kfree_skb(skb);
	return 0;
}

/*
 * Process PEER_CLOSE CPL messages: -> host
 * Handle peer FIN.
 */
static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
	struct cxgbi_sock *csk = ctx;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u.\n",
		csk, csk->state, csk->flags, csk->tid);

	cxgbi_sock_rcv_peer_close(csk);
	__kfree_skb(skb);
	return 0;
}

/*
 * Process CLOSE_CONN_RPL CPL message: -> host
 * Process a peer ACK to our FIN.
 */
static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
			    void *ctx)
{
	struct cxgbi_sock *csk = ctx;
	struct cpl_close_con_rpl *rpl = cplhdr(skb);

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u, snxt %u.\n",
		csk, csk->state, csk->flags, csk->tid, ntohl(rpl->snd_nxt));

	cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
	__kfree_skb(skb);
	return 0;
}

/*
 * Process ABORT_REQ_RSS CPL message: -> host
 * Process abort requests.  If we are waiting for an ABORT_RPL we ignore this
 * request except that we need to reply to it.
 */

static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
				 int *need_rst)
{
	switch (abort_reason) {
	case CPL_ERR_BAD_SYN: /* fall through */
	case CPL_ERR_CONN_RESET:
		return csk->state > CTP_ESTABLISHED ? -EPIPE : -ECONNRESET;
	case CPL_ERR_XMIT_TIMEDOUT:
	case CPL_ERR_PERSIST_TIMEDOUT:
	case CPL_ERR_FINWAIT2_TIMEDOUT:
	case CPL_ERR_KEEPALIVE_TIMEDOUT:
		return -ETIMEDOUT;
	default:
		return -EIO;
	}
}

static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
	const struct cpl_abort_req_rss *req = cplhdr(skb);
	struct cxgbi_sock *csk = ctx;
	int rst_status = CPL_ABORT_NO_RST;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u.\n",
		csk, csk->state, csk->flags, csk->tid);

	if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
	    req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
		goto done;
	}

	cxgbi_sock_get(csk);
	spin_lock_bh(&csk->lock);

	if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
		cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
		cxgbi_sock_set_state(csk, CTP_ABORTING);
		goto out;
	}

	cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
	send_abort_rpl(csk, rst_status);

	if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
		csk->err = abort_status_to_errno(csk, req->status, &rst_status);
		cxgbi_sock_closed(csk);
	}

out:
	spin_unlock_bh(&csk->lock);
	cxgbi_sock_put(csk);
done:
	__kfree_skb(skb);
	return 0;
}

/*
 * Process ABORT_RPL_RSS CPL message: -> host
 * Process abort replies.  We only process these messages if we anticipate
 * them as the coordination between SW and HW in this area is somewhat lacking
 * and sometimes we get ABORT_RPLs after we are done with the connection that
 * originated the ABORT_REQ.
 */
static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
	struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
	struct cxgbi_sock *csk = ctx;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
		rpl->status, csk, csk ? csk->state : 0,
		csk ? csk->flags : 0UL);
	/*
	 * Ignore replies to post-close aborts indicating that the abort was
	 * requested too late.  These connections are terminated when we get
	 * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
	 * arrives the TID is either no longer used or it has been recycled.
	 */
	if (rpl->status == CPL_ERR_ABORT_FAILED)
		goto rel_skb;
	/*
	 * Sometimes we've already closed the connection, e.g., a post-close
	 * abort races with ABORT_REQ_RSS, the latter frees the connection
	 * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
	 * but FW turns the ABORT_REQ into a regular one and so we get
	 * ABORT_RPL_RSS with status 0 and no connection.
	 */
	if (csk)
		cxgbi_sock_rcv_abort_rpl(csk);
rel_skb:
	__kfree_skb(skb);
	return 0;
}

/*
 * Process RX_ISCSI_HDR CPL message: -> host
 * Handle received PDUs, the payload could be DDP'ed. If not, the payload
 * follow after the bhs.
 */
static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
{
	struct cxgbi_sock *csk = ctx;
	struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
	struct cpl_iscsi_hdr_norss data_cpl;
	struct cpl_rx_data_ddp_norss ddp_cpl;
	unsigned int hdr_len, data_len, status;
	unsigned int len;
	int err;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
		"csk 0x%p,%u,0x%lx,%u, skb 0x%p,%u.\n",
		csk, csk->state, csk->flags, csk->tid, skb, skb->len);

	spin_lock_bh(&csk->lock);

	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
			"csk 0x%p,%u,0x%lx,%u, bad state.\n",
			csk, csk->state, csk->flags, csk->tid);
		if (csk->state != CTP_ABORTING)
			goto abort_conn;
		else
			goto discard;
	}

	cxgbi_skcb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
	cxgbi_skcb_flags(skb) = 0;

	skb_reset_transport_header(skb);
	__skb_pull(skb, sizeof(struct cpl_iscsi_hdr));

	len = hdr_len = ntohs(hdr_cpl->len);
	/* msg coalesce is off or not enough data received */
	if (skb->len <= hdr_len) {
		pr_err("%s: tid %u, CPL_ISCSI_HDR, skb len %u < %u.\n",
			csk->cdev->ports[csk->port_id]->name, csk->tid,
			skb->len, hdr_len);
		goto abort_conn;
	}
	cxgbi_skcb_set_flag(skb, SKCBF_RX_COALESCED);

	err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
			    sizeof(ddp_cpl));
	if (err < 0) {
		pr_err("%s: tid %u, copy cpl_ddp %u-%zu failed %d.\n",
			csk->cdev->ports[csk->port_id]->name, csk->tid,
			skb->len, sizeof(ddp_cpl), err);
		goto abort_conn;
	}

	cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
	cxgbi_skcb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
	cxgbi_skcb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
	status = ntohl(ddp_cpl.ddp_status);

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
		"csk 0x%p, skb 0x%p,%u, pdulen %u, status 0x%x.\n",
		csk, skb, skb->len, cxgbi_skcb_rx_pdulen(skb), status);

	if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT))
		cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
	if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT))
		cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
	if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT))
		cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);

	if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
		err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
		if (err < 0) {
			pr_err("%s: tid %u, cp %zu/%u failed %d.\n",
				csk->cdev->ports[csk->port_id]->name,
				csk->tid, sizeof(data_cpl), skb->len, err);
			goto abort_conn;
		}
		data_len = ntohs(data_cpl.len);
		log_debug(1 << CXGBI_DBG_DDP | 1 << CXGBI_DBG_PDU_RX,
			"skb 0x%p, pdu not ddp'ed %u/%u, status 0x%x.\n",
			skb, data_len, cxgbi_skcb_rx_pdulen(skb), status);
		len += sizeof(data_cpl) + data_len;
	} else if (status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT))
		cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);

	csk->rcv_nxt = ntohl(ddp_cpl.seq) + cxgbi_skcb_rx_pdulen(skb);
	__pskb_trim(skb, len);
	__skb_queue_tail(&csk->receive_queue, skb);
	cxgbi_conn_pdu_ready(csk);

	spin_unlock_bh(&csk->lock);
	return 0;

abort_conn:
	send_abort_req(csk);
discard:
	spin_unlock_bh(&csk->lock);
	__kfree_skb(skb);
	return 0;
}

/*
 * Process TX_DATA_ACK CPL messages: -> host
 * Process an acknowledgment of WR completion.  Advance snd_una and send the
 * next batch of work requests from the write queue.
 */
static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
	struct cxgbi_sock *csk = ctx;
	struct cpl_wr_ack *hdr = cplhdr(skb);

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
		"csk 0x%p,%u,0x%lx,%u, cr %u.\n",
		csk, csk->state, csk->flags, csk->tid, ntohs(hdr->credits));

	cxgbi_sock_rcv_wr_ack(csk, ntohs(hdr->credits), ntohl(hdr->snd_una), 1);
	__kfree_skb(skb);
	return 0;
}

/*
 * for each connection, pre-allocate skbs needed for close/abort requests. So
 * that we can service the request right away.
 */
static int alloc_cpls(struct cxgbi_sock *csk)
{
	csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req), 0,
					GFP_KERNEL);
	if (!csk->cpl_close)
		return -ENOMEM;
	csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req), 0,
					GFP_KERNEL);
	if (!csk->cpl_abort_req)
		goto free_cpl_skbs;

	csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl), 0,
					GFP_KERNEL);
	if (!csk->cpl_abort_rpl)
		goto free_cpl_skbs;

	return 0;

free_cpl_skbs:
	cxgbi_sock_free_cpl_skbs(csk);
	return -ENOMEM;
}

/**
 * release_offload_resources - release offload resource
 * @c3cn: the offloaded iscsi tcp connection.
 * Release resources held by an offload connection (TID, L2T entry, etc.)
 */
static void l2t_put(struct cxgbi_sock *csk)
{
	struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;

	if (csk->l2t) {
		l2t_release(t3dev, csk->l2t);
		csk->l2t = NULL;
		cxgbi_sock_put(csk);
	}
}

static void release_offload_resources(struct cxgbi_sock *csk)
{
	struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx,%u.\n",
		csk, csk->state, csk->flags, csk->tid);

	csk->rss_qid = 0;
	cxgbi_sock_free_cpl_skbs(csk);

	if (csk->wr_cred != csk->wr_max_cred) {
		cxgbi_sock_purge_wr_queue(csk);
		cxgbi_sock_reset_wr_list(csk);
	}
	l2t_put(csk);
	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
		free_atid(csk);
	else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
		cxgb3_remove_tid(t3dev, (void *)csk, csk->tid);
		cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
		cxgbi_sock_put(csk);
	}
	csk->dst = NULL;
	csk->cdev = NULL;
}

static void update_address(struct cxgbi_hba *chba)
{
	if (chba->ipv4addr) {
		if (chba->vdev &&
		    chba->ipv4addr != cxgb3i_get_private_ipv4addr(chba->vdev)) {
			cxgb3i_set_private_ipv4addr(chba->vdev, chba->ipv4addr);
			cxgb3i_set_private_ipv4addr(chba->ndev, 0);
			pr_info("%s set %pI4.\n",
				chba->vdev->name, &chba->ipv4addr);
		} else if (chba->ipv4addr !=
				cxgb3i_get_private_ipv4addr(chba->ndev)) {
			cxgb3i_set_private_ipv4addr(chba->ndev, chba->ipv4addr);
			pr_info("%s set %pI4.\n",
				chba->ndev->name, &chba->ipv4addr);
		}
	} else if (cxgb3i_get_private_ipv4addr(chba->ndev)) {
		if (chba->vdev)
			cxgb3i_set_private_ipv4addr(chba->vdev, 0);
		cxgb3i_set_private_ipv4addr(chba->ndev, 0);
	}
}

static int init_act_open(struct cxgbi_sock *csk)
{
	struct dst_entry *dst = csk->dst;
	struct cxgbi_device *cdev = csk->cdev;
	struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
	struct net_device *ndev = cdev->ports[csk->port_id];
	struct cxgbi_hba *chba = cdev->hbas[csk->port_id];
	struct sk_buff *skb = NULL;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx.\n", csk, csk->state, csk->flags);

	update_address(chba);
	if (chba->ipv4addr)
		csk->saddr.sin_addr.s_addr = chba->ipv4addr;

	csk->rss_qid = 0;
	csk->l2t = t3_l2t_get(t3dev, dst_get_neighbour(dst), ndev);
	if (!csk->l2t) {
		pr_err("NO l2t available.\n");
		return -EINVAL;
	}
	cxgbi_sock_get(csk);

	csk->atid = cxgb3_alloc_atid(t3dev, &t3_client, csk);
	if (csk->atid < 0) {
		pr_err("NO atid available.\n");
		goto rel_resource;
	}
	cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
	cxgbi_sock_get(csk);

	skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
	if (!skb)
		goto rel_resource;
	skb->sk = (struct sock *)csk;
	set_arp_failure_handler(skb, act_open_arp_failure);

	csk->wr_max_cred = csk->wr_cred = T3C_DATA(t3dev)->max_wrs - 1;
	csk->wr_una_cred = 0;
	csk->mss_idx = cxgbi_sock_select_mss(csk, dst_mtu(dst));
	cxgbi_sock_reset_wr_list(csk);
	csk->err = 0;

	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
		"csk 0x%p,%u,0x%lx, %pI4:%u-%pI4:%u.\n",
		csk, csk->state, csk->flags,
		&csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
		&csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));

	cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
	send_act_open_req(csk, skb, csk->l2t);
	return 0;

rel_resource:
	if (skb)
		__kfree_skb(skb);
	return -EINVAL;
}

cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS] = {
	[CPL_ACT_ESTABLISH] = do_act_establish,
	[CPL_ACT_OPEN_RPL] = do_act_open_rpl,
	[CPL_PEER_CLOSE] = do_peer_close,
	[CPL_ABORT_REQ_RSS] = do_abort_req,
	[CPL_ABORT_RPL_RSS] = do_abort_rpl,
	[CPL_CLOSE_CON_RPL] = do_close_con_rpl,
	[CPL_TX_DMA_ACK] = do_wr_ack,
	[CPL_ISCSI_HDR] = do_iscsi_hdr,
};

/**
 * cxgb3i_ofld_init - allocate and initialize resources for each adapter found
 * @cdev:	cxgbi adapter
 */
int cxgb3i_ofld_init(struct cxgbi_device *cdev)
{
	struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
	struct adap_ports port;
	struct ofld_page_info rx_page_info;
	unsigned int wr_len;
	int rc;

	if (t3dev->ctl(t3dev, GET_WR_LEN, &wr_len) < 0 ||
	    t3dev->ctl(t3dev, GET_PORTS, &port) < 0 ||
	    t3dev->ctl(t3dev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
		pr_warn("t3 0x%p, offload up, ioctl failed.\n", t3dev);
		return -EINVAL;
	}

	if (cxgb3i_max_connect > CXGBI_MAX_CONN)
		cxgb3i_max_connect = CXGBI_MAX_CONN;

	rc = cxgbi_device_portmap_create(cdev, cxgb3i_sport_base,
					cxgb3i_max_connect);
	if (rc < 0)
		return rc;

	init_wr_tab(wr_len);
	cdev->csk_release_offload_resources = release_offload_resources;
	cdev->csk_push_tx_frames = push_tx_frames;
	cdev->csk_send_abort_req = send_abort_req;
	cdev->csk_send_close_req = send_close_req;
	cdev->csk_send_rx_credits = send_rx_credits;
	cdev->csk_alloc_cpls = alloc_cpls;
	cdev->csk_init_act_open = init_act_open;

	pr_info("cdev 0x%p, offload up, added.\n", cdev);
	return 0;
}

/*
 * functions to program the pagepod in h/w
 */
static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
{
	struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;

	memset(req, 0, sizeof(*req));

	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
	req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
				   V_ULPTX_CMD(ULP_MEM_WRITE));
	req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
			 V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
}

static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
			unsigned int idx, unsigned int npods,
				struct cxgbi_gather_list *gl)
{
	struct cxgbi_device *cdev = csk->cdev;
	struct cxgbi_ddp_info *ddp = cdev->ddp;
	unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
	int i;

	log_debug(1 << CXGBI_DBG_DDP,
		"csk 0x%p, idx %u, npods %u, gl 0x%p.\n",
		csk, idx, npods, gl);

	for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
		struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
						PPOD_SIZE, 0, GFP_ATOMIC);

		if (!skb)
			return -ENOMEM;

		ulp_mem_io_set_hdr(skb, pm_addr);
		cxgbi_ddp_ppod_set((struct cxgbi_pagepod *)(skb->head +
					sizeof(struct ulp_mem_io)),
				   hdr, gl, i * PPOD_PAGES_MAX);
		skb->priority = CPL_PRIORITY_CONTROL;
		cxgb3_ofld_send(cdev->lldev, skb);
	}
	return 0;
}

static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
			  unsigned int idx, unsigned int npods)
{
	struct cxgbi_device *cdev = chba->cdev;
	struct cxgbi_ddp_info *ddp = cdev->ddp;
	unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
	int i;

	log_debug(1 << CXGBI_DBG_DDP,
		"cdev 0x%p, idx %u, npods %u, tag 0x%x.\n",
		cdev, idx, npods, tag);

	for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
		struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
						PPOD_SIZE, 0, GFP_ATOMIC);

		if (!skb) {
			pr_err("tag 0x%x, 0x%x, %d/%u, skb OOM.\n",
				tag, idx, i, npods);
			continue;
		}
		ulp_mem_io_set_hdr(skb, pm_addr);
		skb->priority = CPL_PRIORITY_CONTROL;
		cxgb3_ofld_send(cdev->lldev, skb);
	}
}

static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk,
				       unsigned int tid, int pg_idx, bool reply)
{
	struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
					GFP_KERNEL);
	struct cpl_set_tcb_field *req;
	u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;

	log_debug(1 << CXGBI_DBG_DDP,
		"csk 0x%p, tid %u, pg_idx %d.\n", csk, tid, pg_idx);
	if (!skb)
		return -ENOMEM;

	/* set up ulp submode and page size */
	req = (struct cpl_set_tcb_field *)skb->head;
	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
	req->reply = V_NO_REPLY(reply ? 0 : 1);
	req->cpu_idx = 0;
	req->word = htons(31);
	req->mask = cpu_to_be64(0xF0000000);
	req->val = cpu_to_be64(val << 28);
	skb->priority = CPL_PRIORITY_CONTROL;

	cxgb3_ofld_send(csk->cdev->lldev, skb);
	return 0;
}

/**
 * cxgb3i_setup_conn_digest - setup conn. digest setting
 * @csk: cxgb tcp socket
 * @tid: connection id
 * @hcrc: header digest enabled
 * @dcrc: data digest enabled
 * @reply: request reply from h/w
 * set up the iscsi digest settings for a connection identified by tid
 */
static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
			     int hcrc, int dcrc, int reply)
{
	struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
					GFP_KERNEL);
	struct cpl_set_tcb_field *req;
	u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);

	log_debug(1 << CXGBI_DBG_DDP,
		"csk 0x%p, tid %u, crc %d,%d.\n", csk, tid, hcrc, dcrc);
	if (!skb)
		return -ENOMEM;

	/* set up ulp submode and page size */
	req = (struct cpl_set_tcb_field *)skb->head;
	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
	req->reply = V_NO_REPLY(reply ? 0 : 1);
	req->cpu_idx = 0;
	req->word = htons(31);
	req->mask = cpu_to_be64(0x0F000000);
	req->val = cpu_to_be64(val << 24);
	skb->priority = CPL_PRIORITY_CONTROL;

	cxgb3_ofld_send(csk->cdev->lldev, skb);
	return 0;
}

/**
 * t3_ddp_cleanup - release the cxgb3 adapter's ddp resource
 * @cdev: cxgb3i adapter
 * release all the resource held by the ddp pagepod manager for a given
 * adapter if needed
 */

static void t3_ddp_cleanup(struct cxgbi_device *cdev)
{
	struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;

	if (cxgbi_ddp_cleanup(cdev)) {
		pr_info("t3dev 0x%p, ulp_iscsi no more user.\n", tdev);
		tdev->ulp_iscsi = NULL;
	}
}

/**
 * ddp_init - initialize the cxgb3 adapter's ddp resource
 * @cdev: cxgb3i adapter
 * initialize the ddp pagepod manager for a given adapter
 */
static int cxgb3i_ddp_init(struct cxgbi_device *cdev)
{
	struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
	struct cxgbi_ddp_info *ddp = tdev->ulp_iscsi;
	struct ulp_iscsi_info uinfo;
	unsigned int pgsz_factor[4];
	int i, err;

	if (ddp) {
		kref_get(&ddp->refcnt);
		pr_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
			tdev, tdev->ulp_iscsi);
		cdev->ddp = ddp;
		return -EALREADY;
	}

	err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
	if (err < 0) {
		pr_err("%s, failed to get iscsi param err=%d.\n",
			 tdev->name, err);
		return err;
	}

	err = cxgbi_ddp_init(cdev, uinfo.llimit, uinfo.ulimit,
			uinfo.max_txsz, uinfo.max_rxsz);
	if (err < 0)
		return err;

	ddp = cdev->ddp;

	uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
	cxgbi_ddp_page_size_factor(pgsz_factor);
	for (i = 0; i < 4; i++)
		uinfo.pgsz_factor[i] = pgsz_factor[i];
	uinfo.ulimit = uinfo.llimit + (ddp->nppods << PPOD_SIZE_SHIFT);

	err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
	if (err < 0) {
		pr_warn("%s unable to set iscsi param err=%d, ddp disabled.\n",
			tdev->name, err);
		cxgbi_ddp_cleanup(cdev);
		return err;
	}
	tdev->ulp_iscsi = ddp;

	cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
	cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
	cdev->csk_ddp_set = ddp_set_map;
	cdev->csk_ddp_clear = ddp_clear_map;

	pr_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
		"%u/%u.\n",
		tdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
		ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
		ddp->max_rxsz, uinfo.max_rxsz);
	return 0;
}

static void cxgb3i_dev_close(struct t3cdev *t3dev)
{
	struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);

	if (!cdev || cdev->flags & CXGBI_FLAG_ADAPTER_RESET) {
		pr_info("0x%p close, f 0x%x.\n", cdev, cdev ? cdev->flags : 0);
		return;
	}

	cxgbi_device_unregister(cdev);
}

/**
 * cxgb3i_dev_open - init a t3 adapter structure and any h/w settings
 * @t3dev: t3cdev adapter
 */
static void cxgb3i_dev_open(struct t3cdev *t3dev)
{
	struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
	struct adapter *adapter = tdev2adap(t3dev);
	int i, err;

	if (cdev) {
		pr_info("0x%p, updating.\n", cdev);
		return;
	}

	cdev = cxgbi_device_register(0, adapter->params.nports);
	if (!cdev) {
		pr_warn("device 0x%p register failed.\n", t3dev);
		return;
	}

	cdev->flags = CXGBI_FLAG_DEV_T3 | CXGBI_FLAG_IPV4_SET;
	cdev->lldev = t3dev;
	cdev->pdev = adapter->pdev;
	cdev->ports = adapter->port;
	cdev->nports = adapter->params.nports;
	cdev->mtus = adapter->params.mtus;
	cdev->nmtus = NMTUS;
	cdev->snd_win = cxgb3i_snd_win;
	cdev->rcv_win = cxgb3i_rcv_win;
	cdev->rx_credit_thres = cxgb3i_rx_credit_thres;
	cdev->skb_tx_rsvd = CXGB3I_TX_HEADER_LEN;
	cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr_norss);
	cdev->dev_ddp_cleanup = t3_ddp_cleanup;
	cdev->itp = &cxgb3i_iscsi_transport;

	err = cxgb3i_ddp_init(cdev);
	if (err) {
		pr_info("0x%p ddp init failed\n", cdev);
		goto err_out;
	}

	err = cxgb3i_ofld_init(cdev);
	if (err) {
		pr_info("0x%p offload init failed\n", cdev);
		goto err_out;
	}

	err = cxgbi_hbas_add(cdev, CXGB3I_MAX_LUN, CXGBI_MAX_CONN,
				&cxgb3i_host_template, cxgb3i_stt);
	if (err)
		goto err_out;

	for (i = 0; i < cdev->nports; i++)
		cdev->hbas[i]->ipv4addr =
			cxgb3i_get_private_ipv4addr(cdev->ports[i]);

	pr_info("cdev 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
		cdev, cdev ? cdev->flags : 0, t3dev, err);
	return;

err_out:
	cxgbi_device_unregister(cdev);
}

static void cxgb3i_dev_event_handler(struct t3cdev *t3dev, u32 event, u32 port)
{
	struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);

	log_debug(1 << CXGBI_DBG_TOE,
		"0x%p, cdev 0x%p, event 0x%x, port 0x%x.\n",
		t3dev, cdev, event, port);
	if (!cdev)
		return;

	switch (event) {
	case OFFLOAD_STATUS_DOWN:
		cdev->flags |= CXGBI_FLAG_ADAPTER_RESET;
		break;
	case OFFLOAD_STATUS_UP:
		cdev->flags &= ~CXGBI_FLAG_ADAPTER_RESET;
		break;
	}
}

/**
 * cxgb3i_init_module - module init entry point
 *
 * initialize any driver wide global data structures and register itself
 *	with the cxgb3 module
 */
static int __init cxgb3i_init_module(void)
{
	int rc;

	printk(KERN_INFO "%s", version);

	rc = cxgbi_iscsi_init(&cxgb3i_iscsi_transport, &cxgb3i_stt);
	if (rc < 0)
		return rc;

	cxgb3_register_client(&t3_client);
	return 0;
}

/**
 * cxgb3i_exit_module - module cleanup/exit entry point
 *
 * go through the driver hba list and for each hba, release any resource held.
 *	and unregisters iscsi transport and the cxgb3 module
 */
static void __exit cxgb3i_exit_module(void)
{
	cxgb3_unregister_client(&t3_client);
	cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T3);
	cxgbi_iscsi_cleanup(&cxgb3i_iscsi_transport, &cxgb3i_stt);
}

module_init(cxgb3i_init_module);
module_exit(cxgb3i_exit_module);