aboutsummaryrefslogtreecommitdiff
path: root/sys/ofed/drivers/infiniband/ulp/sdp/sdp_main.c
blob: 2e91d85294348b7a4a054eea38ba13a23681ed71 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963

/*-
 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
 *      The Regents of the University of California.  All rights reserved.
 * Copyright (c) 2004 The FreeBSD Foundation.  All rights reserved.
 * Copyright (c) 2004-2008 Robert N. M. Watson.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Excerpts taken from tcp_subr.c, tcp_usrreq.c, uipc_socket.c
 */

/*
 *
 * Copyright (c) 2010 Isilon Systems, Inc.
 * Copyright (c) 2010 iX Systems, Inc.
 * Copyright (c) 2010 Panasas, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice unmodified, this list of conditions, and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "sdp.h"

#include <net/if.h>
#include <net/route.h>
#include <net/vnet.h>
#include <sys/sysctl.h>

uma_zone_t	sdp_zone;
struct rwlock	sdp_lock;
LIST_HEAD(, sdp_sock) sdp_list;

struct workqueue_struct *rx_comp_wq;

RW_SYSINIT(sdplockinit, &sdp_lock, "SDP lock");
#define	SDP_LIST_WLOCK()	rw_wlock(&sdp_lock)
#define	SDP_LIST_RLOCK()	rw_rlock(&sdp_lock)
#define	SDP_LIST_WUNLOCK()	rw_wunlock(&sdp_lock)
#define	SDP_LIST_RUNLOCK()	rw_runlock(&sdp_lock)
#define	SDP_LIST_WLOCK_ASSERT()	rw_assert(&sdp_lock, RW_WLOCKED)
#define	SDP_LIST_RLOCK_ASSERT()	rw_assert(&sdp_lock, RW_RLOCKED)
#define	SDP_LIST_LOCK_ASSERT()	rw_assert(&sdp_lock, RW_LOCKED)

static MALLOC_DEFINE(M_SDP, "sdp", "Socket Direct Protocol");

static void sdp_stop_keepalive_timer(struct socket *so);

/*
 * SDP protocol interface to socket abstraction.
 */
/*
 * sdp_sendspace and sdp_recvspace are the default send and receive window
 * sizes, respectively.
 */
u_long	sdp_sendspace = 1024*32;
u_long	sdp_recvspace = 1024*64;

static int sdp_count;

/*
 * Disable async. CMA events for sockets which are being torn down.
 */
static void
sdp_destroy_cma(struct sdp_sock *ssk)
{

	if (ssk->id == NULL)
		return;
	rdma_destroy_id(ssk->id);
	ssk->id = NULL;
}

static int
sdp_pcbbind(struct sdp_sock *ssk, struct sockaddr *nam, struct ucred *cred)
{
	struct sockaddr_in *sin;
	struct sockaddr_in null;
	int error;

	SDP_WLOCK_ASSERT(ssk);

	if (ssk->lport != 0 || ssk->laddr != INADDR_ANY)
		return (EINVAL);
	/* rdma_bind_addr handles bind races.  */
	SDP_WUNLOCK(ssk);
	if (ssk->id == NULL)
		ssk->id = rdma_create_id(sdp_cma_handler, ssk, RDMA_PS_SDP);
	if (ssk->id == NULL) {
		SDP_WLOCK(ssk);
		return (ENOMEM);
	}
	if (nam == NULL) {
		null.sin_family = AF_INET;
		null.sin_len = sizeof(null);
		null.sin_addr.s_addr = INADDR_ANY;
		null.sin_port = 0;
		bzero(&null.sin_zero, sizeof(null.sin_zero));
		nam = (struct sockaddr *)&null;
	}
	error = -rdma_bind_addr(ssk->id, nam);
	SDP_WLOCK(ssk);
	if (error == 0) {
		sin = (struct sockaddr_in *)&ssk->id->route.addr.src_addr;
		ssk->laddr = sin->sin_addr.s_addr;
		ssk->lport = sin->sin_port;
	} else
		sdp_destroy_cma(ssk);
	return (error);
}

static void
sdp_pcbfree(struct sdp_sock *ssk)
{
	KASSERT(ssk->socket == NULL, ("ssk %p socket still attached", ssk));

	sdp_dbg(ssk->socket, "Freeing pcb");
	SDP_WLOCK_ASSERT(ssk);
	ssk->flags |= SDP_DESTROY;
	SDP_WUNLOCK(ssk);
	SDP_LIST_WLOCK();
	sdp_count--;
	LIST_REMOVE(ssk, list);
	SDP_LIST_WUNLOCK();
	crfree(ssk->cred);
	sdp_destroy_cma(ssk);
	ssk->qp_active = 0;
	if (ssk->qp) {
		ib_destroy_qp(ssk->qp);
		ssk->qp = NULL;
	}
	sdp_tx_ring_destroy(ssk);
	sdp_rx_ring_destroy(ssk);
	rw_destroy(&ssk->rx_ring.destroyed_lock);
	uma_zfree(sdp_zone, ssk);
	rw_destroy(&ssk->lock);
}

/*
 * Common routines to return a socket address.
 */
static struct sockaddr *
sdp_sockaddr(in_port_t port, struct in_addr *addr_p)
{
	struct sockaddr_in *sin;

	sin = malloc(sizeof *sin, M_SONAME,
		M_WAITOK | M_ZERO);
	sin->sin_family = AF_INET;
	sin->sin_len = sizeof(*sin);
	sin->sin_addr = *addr_p;
	sin->sin_port = port;

	return (struct sockaddr *)sin;
}

static int
sdp_getsockaddr(struct socket *so, struct sockaddr **nam)
{
	struct sdp_sock *ssk;
	struct in_addr addr;
	in_port_t port;

	ssk = sdp_sk(so);
	SDP_RLOCK(ssk);
	port = ssk->lport;
	addr.s_addr = ssk->laddr;
	SDP_RUNLOCK(ssk);

	*nam = sdp_sockaddr(port, &addr);
	return 0;
}

static int
sdp_getpeeraddr(struct socket *so, struct sockaddr **nam)
{
	struct sdp_sock *ssk;
	struct in_addr addr;
	in_port_t port;

	ssk = sdp_sk(so);
	SDP_RLOCK(ssk);
	port = ssk->fport;
	addr.s_addr = ssk->faddr;
	SDP_RUNLOCK(ssk);

	*nam = sdp_sockaddr(port, &addr);
	return 0;
}

static void
sdp_pcbnotifyall(struct in_addr faddr, int errno,
    struct sdp_sock *(*notify)(struct sdp_sock *, int))
{
	struct sdp_sock *ssk, *ssk_temp;

	SDP_LIST_WLOCK();
	LIST_FOREACH_SAFE(ssk, &sdp_list, list, ssk_temp) {
		SDP_WLOCK(ssk);
		if (ssk->faddr != faddr.s_addr || ssk->socket == NULL) {
			SDP_WUNLOCK(ssk);
			continue;
		}
		if ((ssk->flags & SDP_DESTROY) == 0)
			if ((*notify)(ssk, errno))
				SDP_WUNLOCK(ssk);
	}
	SDP_LIST_WUNLOCK();
}

#if 0
static void
sdp_apply_all(void (*func)(struct sdp_sock *, void *), void *arg)
{
	struct sdp_sock *ssk;

	SDP_LIST_RLOCK();
	LIST_FOREACH(ssk, &sdp_list, list) {
		SDP_WLOCK(ssk);
		func(ssk, arg);
		SDP_WUNLOCK(ssk);
	}
	SDP_LIST_RUNLOCK();
}
#endif

static void
sdp_output_reset(struct sdp_sock *ssk)
{
	struct rdma_cm_id *id;

	SDP_WLOCK_ASSERT(ssk);
	if (ssk->id) {
		id = ssk->id;
		ssk->qp_active = 0;
		SDP_WUNLOCK(ssk);
		rdma_disconnect(id);
		SDP_WLOCK(ssk);
	}
	ssk->state = TCPS_CLOSED;
}

/*
 * Attempt to close a SDP socket, marking it as dropped, and freeing
 * the socket if we hold the only reference.
 */
static struct sdp_sock *
sdp_closed(struct sdp_sock *ssk)
{
	struct socket *so;

	SDP_WLOCK_ASSERT(ssk);

	ssk->flags |= SDP_DROPPED;
	so = ssk->socket;
	soisdisconnected(so);
	if (ssk->flags & SDP_SOCKREF) {
		KASSERT(so->so_state & SS_PROTOREF,
		    ("sdp_closed: !SS_PROTOREF"));
		ssk->flags &= ~SDP_SOCKREF;
		SDP_WUNLOCK(ssk);
		ACCEPT_LOCK();
		SOCK_LOCK(so);
		so->so_state &= ~SS_PROTOREF;
		sofree(so);
		return (NULL);
	}
	return (ssk);
}

/*
 * Perform timer based shutdowns which can not operate in
 * callout context.
 */
static void
sdp_shutdown_task(void *data, int pending)
{
	struct sdp_sock *ssk;

	ssk = data;
	SDP_WLOCK(ssk);
	/*
	 * I don't think this can race with another call to pcbfree()
	 * because SDP_TIMEWAIT protects it.  SDP_DESTROY may be redundant.
	 */
	if (ssk->flags & SDP_DESTROY)
		panic("sdp_shutdown_task: Racing with pcbfree for ssk %p",
		    ssk);
	if (ssk->flags & SDP_DISCON)
		sdp_output_reset(ssk);
	/* We have to clear this so sdp_detach() will call pcbfree(). */
	ssk->flags &= ~(SDP_TIMEWAIT | SDP_DREQWAIT);
	if ((ssk->flags & SDP_DROPPED) == 0 &&
	    sdp_closed(ssk) == NULL)
		return;
	if (ssk->socket == NULL) {
		sdp_pcbfree(ssk);
		return;
	}
	SDP_WUNLOCK(ssk);
}

/*
 * 2msl has expired, schedule the shutdown task.
 */
static void
sdp_2msl_timeout(void *data)
{
	struct sdp_sock *ssk;

	ssk = data;
	/* Callout canceled. */
        if (!callout_active(&ssk->keep2msl))
		goto out;
        callout_deactivate(&ssk->keep2msl);
	/* Should be impossible, defensive programming. */
	if ((ssk->flags & SDP_TIMEWAIT) == 0)
		goto out;
	taskqueue_enqueue(taskqueue_thread, &ssk->shutdown_task);
out:
	SDP_WUNLOCK(ssk);
	return;
}

/*
 * Schedule the 2msl wait timer.
 */
static void
sdp_2msl_wait(struct sdp_sock *ssk)
{

	SDP_WLOCK_ASSERT(ssk);
	ssk->flags |= SDP_TIMEWAIT;
	ssk->state = TCPS_TIME_WAIT;
	soisdisconnected(ssk->socket);
	callout_reset(&ssk->keep2msl, TCPTV_MSL, sdp_2msl_timeout, ssk);
}

/*
 * Timed out waiting for the final fin/ack from rdma_disconnect().
 */
static void
sdp_dreq_timeout(void *data)
{
	struct sdp_sock *ssk;

	ssk = data;
	/* Callout canceled. */
        if (!callout_active(&ssk->keep2msl))
		goto out;
	/* Callout rescheduled, probably as a different timer. */
	if (callout_pending(&ssk->keep2msl))
		goto out;
        callout_deactivate(&ssk->keep2msl);
	if (ssk->state != TCPS_FIN_WAIT_1 && ssk->state != TCPS_LAST_ACK)
		goto out;
	if ((ssk->flags & SDP_DREQWAIT) == 0)
		goto out;
	ssk->flags &= ~SDP_DREQWAIT;
	ssk->flags |= SDP_DISCON;
	sdp_2msl_wait(ssk);
	ssk->qp_active = 0;
out:
	SDP_WUNLOCK(ssk);
}

/*
 * Received the final fin/ack.  Cancel the 2msl.
 */
void
sdp_cancel_dreq_wait_timeout(struct sdp_sock *ssk)
{
	sdp_dbg(ssk->socket, "cancelling dreq wait timeout\n");
	ssk->flags &= ~SDP_DREQWAIT;
	sdp_2msl_wait(ssk);
}

static int
sdp_init_sock(struct socket *sk)
{
	struct sdp_sock *ssk = sdp_sk(sk);

	sdp_dbg(sk, "%s\n", __func__);

	callout_init_rw(&ssk->keep2msl, &ssk->lock, CALLOUT_RETURNUNLOCKED);
	TASK_INIT(&ssk->shutdown_task, 0, sdp_shutdown_task, ssk);
#ifdef SDP_ZCOPY
	INIT_DELAYED_WORK(&ssk->srcavail_cancel_work, srcavail_cancel_timeout);
	ssk->zcopy_thresh = -1; /* use global sdp_zcopy_thresh */
	ssk->tx_ring.rdma_inflight = NULL;
#endif
	atomic_set(&ssk->mseq_ack, 0);
	sdp_rx_ring_init(ssk);
	ssk->tx_ring.buffer = NULL;

	return 0;
}

/*
 * Allocate an sdp_sock for the socket and reserve socket buffer space.
 */
static int
sdp_attach(struct socket *so, int proto, struct thread *td)
{
	struct sdp_sock *ssk;
	int error;

	ssk = sdp_sk(so);
	KASSERT(ssk == NULL, ("sdp_attach: ssk already set on so %p", so));
	if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
		error = soreserve(so, sdp_sendspace, sdp_recvspace);
		if (error)
			return (error);
	}
	so->so_rcv.sb_flags |= SB_AUTOSIZE;
	so->so_snd.sb_flags |= SB_AUTOSIZE;
	ssk = uma_zalloc(sdp_zone, M_NOWAIT | M_ZERO);
	if (ssk == NULL)
		return (ENOBUFS);
	rw_init(&ssk->lock, "sdpsock");
	ssk->socket = so;
	ssk->cred = crhold(so->so_cred);
	so->so_pcb = (caddr_t)ssk;
	sdp_init_sock(so);
	ssk->flags = 0;
	ssk->qp_active = 0;
	ssk->state = TCPS_CLOSED;
	SDP_LIST_WLOCK();
	LIST_INSERT_HEAD(&sdp_list, ssk, list);
	sdp_count++;
	SDP_LIST_WUNLOCK();
	if ((so->so_options & SO_LINGER) && so->so_linger == 0)
		so->so_linger = TCP_LINGERTIME;

	return (0);
}

/*
 * Detach SDP from the socket, potentially leaving it around for the
 * timewait to expire.
 */
static void
sdp_detach(struct socket *so)
{
	struct sdp_sock *ssk;

	ssk = sdp_sk(so);
	SDP_WLOCK(ssk);
	KASSERT(ssk->socket != NULL, ("sdp_detach: socket is NULL"));
	ssk->socket->so_pcb = NULL;
	ssk->socket = NULL;
	if (ssk->flags & (SDP_TIMEWAIT | SDP_DREQWAIT))
		SDP_WUNLOCK(ssk);
	else if (ssk->flags & SDP_DROPPED || ssk->state < TCPS_SYN_SENT)
		sdp_pcbfree(ssk);
	else
		panic("sdp_detach: Unexpected state, ssk %p.\n", ssk);
}

/*
 * Allocate a local address for the socket.
 */
static int
sdp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
{
	int error = 0;
	struct sdp_sock *ssk;
	struct sockaddr_in *sin;

	sin = (struct sockaddr_in *)nam;
	if (nam->sa_len != sizeof (*sin))
		return (EINVAL);
	if (sin->sin_family != AF_INET)
		return (EINVAL);
	if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
		return (EAFNOSUPPORT);

	ssk = sdp_sk(so);
	SDP_WLOCK(ssk);
	if (ssk->flags & (SDP_TIMEWAIT | SDP_DROPPED)) {
		error = EINVAL;
		goto out;
	}
	error = sdp_pcbbind(ssk, nam, td->td_ucred);
out:
	SDP_WUNLOCK(ssk);

	return (error);
}

/*
 * Prepare to accept connections.
 */
static int
sdp_listen(struct socket *so, int backlog, struct thread *td)
{
	int error = 0;
	struct sdp_sock *ssk;

	ssk = sdp_sk(so);
	SDP_WLOCK(ssk);
	if (ssk->flags & (SDP_TIMEWAIT | SDP_DROPPED)) {
		error = EINVAL;
		goto out;
	}
	if (error == 0 && ssk->lport == 0)
		error = sdp_pcbbind(ssk, (struct sockaddr *)0, td->td_ucred);
	SOCK_LOCK(so);
	if (error == 0)
		error = solisten_proto_check(so);
	if (error == 0) {
		solisten_proto(so, backlog);
		ssk->state = TCPS_LISTEN;
	}
	SOCK_UNLOCK(so);

out:
	SDP_WUNLOCK(ssk);
	if (error == 0)
		error = -rdma_listen(ssk->id, backlog);
	return (error);
}

/*
 * Initiate a SDP connection to nam.
 */
static int
sdp_start_connect(struct sdp_sock *ssk, struct sockaddr *nam, struct thread *td)
{
	struct sockaddr_in src;
	struct socket *so;
	int error;

	so = ssk->socket;

	SDP_WLOCK_ASSERT(ssk);
	if (ssk->lport == 0) {
		error = sdp_pcbbind(ssk, (struct sockaddr *)0, td->td_ucred);
		if (error)
			return error;
	}
	src.sin_family = AF_INET;
	src.sin_len = sizeof(src);
	bzero(&src.sin_zero, sizeof(src.sin_zero));
	src.sin_port = ssk->lport;
	src.sin_addr.s_addr = ssk->laddr;
	soisconnecting(so);
	SDP_WUNLOCK(ssk);
	error = -rdma_resolve_addr(ssk->id, (struct sockaddr *)&src, nam,
	    SDP_RESOLVE_TIMEOUT);
	SDP_WLOCK(ssk);
	if (error == 0)
		ssk->state = TCPS_SYN_SENT;

	return 0;
}

/*
 * Initiate SDP connection.
 */
static int
sdp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
{
	int error = 0;
	struct sdp_sock *ssk;
	struct sockaddr_in *sin;

	sin = (struct sockaddr_in *)nam;
	if (nam->sa_len != sizeof (*sin))
		return (EINVAL);
	if (sin->sin_family != AF_INET)
		return (EINVAL);
	if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
		return (EAFNOSUPPORT);
	if ((error = prison_remote_ip4(td->td_ucred, &sin->sin_addr)) != 0)
		return (error);
	ssk = sdp_sk(so);
	SDP_WLOCK(ssk);
	if (ssk->flags & (SDP_TIMEWAIT | SDP_DROPPED))
		error = EINVAL;
	else
		error = sdp_start_connect(ssk, nam, td);
	SDP_WUNLOCK(ssk);
	return (error);
}

/*
 * Drop a SDP socket, reporting
 * the specified error.  If connection is synchronized,
 * then send a RST to peer.
 */
static struct sdp_sock *
sdp_drop(struct sdp_sock *ssk, int errno)
{
	struct socket *so;

	SDP_WLOCK_ASSERT(ssk);
	so = ssk->socket;
	if (TCPS_HAVERCVDSYN(ssk->state))
		sdp_output_reset(ssk);
	if (errno == ETIMEDOUT && ssk->softerror)
		errno = ssk->softerror;
	so->so_error = errno;
	return (sdp_closed(ssk));
}

/*
 * User issued close, and wish to trail through shutdown states:
 * if never received SYN, just forget it.  If got a SYN from peer,
 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
 * If already got a FIN from peer, then almost done; go to LAST_ACK
 * state.  In all other cases, have already sent FIN to peer (e.g.
 * after PRU_SHUTDOWN), and just have to play tedious game waiting
 * for peer to send FIN or not respond to keep-alives, etc.
 * We can let the user exit from the close as soon as the FIN is acked.
 */
static void
sdp_usrclosed(struct sdp_sock *ssk)
{

	SDP_WLOCK_ASSERT(ssk);

	switch (ssk->state) {
	case TCPS_LISTEN:
		ssk->state = TCPS_CLOSED;
		SDP_WUNLOCK(ssk);
		sdp_destroy_cma(ssk);
		SDP_WLOCK(ssk);
		/* FALLTHROUGH */
	case TCPS_CLOSED:
		ssk = sdp_closed(ssk);
		/*
		 * sdp_closed() should never return NULL here as the socket is
		 * still open.
		 */
		KASSERT(ssk != NULL,
		    ("sdp_usrclosed: sdp_closed() returned NULL"));
		break;

	case TCPS_SYN_SENT:
		/* FALLTHROUGH */
	case TCPS_SYN_RECEIVED:
		ssk->flags |= SDP_NEEDFIN;
		break;

	case TCPS_ESTABLISHED:
		ssk->flags |= SDP_NEEDFIN;
		ssk->state = TCPS_FIN_WAIT_1;
		break;

	case TCPS_CLOSE_WAIT:
		ssk->state = TCPS_LAST_ACK;
		break;
	}
	if (ssk->state >= TCPS_FIN_WAIT_2) {
		/* Prevent the connection hanging in FIN_WAIT_2 forever. */
		if (ssk->state == TCPS_FIN_WAIT_2)
			sdp_2msl_wait(ssk);
		else
			soisdisconnected(ssk->socket);
	}
}

static void
sdp_output_disconnect(struct sdp_sock *ssk)
{

	SDP_WLOCK_ASSERT(ssk);
	callout_reset(&ssk->keep2msl, SDP_FIN_WAIT_TIMEOUT,
	    sdp_dreq_timeout, ssk);
	ssk->flags |= SDP_NEEDFIN | SDP_DREQWAIT;
	sdp_post_sends(ssk, M_NOWAIT);
}

/*
 * Initiate or continue a disconnect.
 * If embryonic state, just send reset (once).
 * If in ``let data drain'' option and linger null, just drop.
 * Otherwise (hard), mark socket disconnecting and drop
 * current input data; switch states based on user close, and
 * send segment to peer (with FIN).
 */
static void
sdp_start_disconnect(struct sdp_sock *ssk)
{
	struct socket *so;
	int unread;

	so = ssk->socket;
	SDP_WLOCK_ASSERT(ssk);
	sdp_stop_keepalive_timer(so);
	/*
	 * Neither sdp_closed() nor sdp_drop() should return NULL, as the
	 * socket is still open.
	 */
	if (ssk->state < TCPS_ESTABLISHED) {
		ssk = sdp_closed(ssk);
		KASSERT(ssk != NULL,
		    ("sdp_start_disconnect: sdp_close() returned NULL"));
	} else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
		ssk = sdp_drop(ssk, 0);
		KASSERT(ssk != NULL,
		    ("sdp_start_disconnect: sdp_drop() returned NULL"));
	} else {
		soisdisconnecting(so);
		unread = sbused(&so->so_rcv);
		sbflush(&so->so_rcv);
		sdp_usrclosed(ssk);
		if (!(ssk->flags & SDP_DROPPED)) {
			if (unread)
				sdp_output_reset(ssk);
			else
				sdp_output_disconnect(ssk);
		}
	}
}

/*
 * User initiated disconnect.
 */
static int
sdp_disconnect(struct socket *so)
{
	struct sdp_sock *ssk;
	int error = 0;

	ssk = sdp_sk(so);
	SDP_WLOCK(ssk);
	if (ssk->flags & (SDP_TIMEWAIT | SDP_DROPPED)) {
		error = ECONNRESET;
		goto out;
	}
	sdp_start_disconnect(ssk);
out:
	SDP_WUNLOCK(ssk);
	return (error);
}

/*
 * Accept a connection.  Essentially all the work is done at higher levels;
 * just return the address of the peer, storing through addr.
 *
 *
 * XXX This is broken XXX
 * 
 * The rationale for acquiring the sdp lock here is somewhat complicated,
 * and is described in detail in the commit log entry for r175612.  Acquiring
 * it delays an accept(2) racing with sonewconn(), which inserts the socket
 * before the address/port fields are initialized.  A better fix would
 * prevent the socket from being placed in the listen queue until all fields
 * are fully initialized.
 */
static int
sdp_accept(struct socket *so, struct sockaddr **nam)
{
	struct sdp_sock *ssk = NULL;
	struct in_addr addr;
	in_port_t port;
	int error;

	if (so->so_state & SS_ISDISCONNECTED)
		return (ECONNABORTED);

	port = 0;
	addr.s_addr = 0;
	error = 0;
	ssk = sdp_sk(so);
	SDP_WLOCK(ssk);
	if (ssk->flags & (SDP_TIMEWAIT | SDP_DROPPED)) {
		error = ECONNABORTED;
		goto out;
	}
	port = ssk->fport;
	addr.s_addr = ssk->faddr;
out:
	SDP_WUNLOCK(ssk);
	if (error == 0)
		*nam = sdp_sockaddr(port, &addr);
	return error;
}

/*
 * Mark the connection as being incapable of further output.
 */
static int
sdp_shutdown(struct socket *so)
{
	int error = 0;
	struct sdp_sock *ssk;

	ssk = sdp_sk(so);
	SDP_WLOCK(ssk);
	if (ssk->flags & (SDP_TIMEWAIT | SDP_DROPPED)) {
		error = ECONNRESET;
		goto out;
	}
	socantsendmore(so);
	sdp_usrclosed(ssk);
	if (!(ssk->flags & SDP_DROPPED))
		sdp_output_disconnect(ssk);

out:
	SDP_WUNLOCK(ssk);

	return (error);
}

static void
sdp_append(struct sdp_sock *ssk, struct sockbuf *sb, struct mbuf *mb, int cnt)
{
	struct mbuf *n;
	int ncnt;

	SOCKBUF_LOCK_ASSERT(sb);
	SBLASTRECORDCHK(sb);
	KASSERT(mb->m_flags & M_PKTHDR,
		("sdp_append: %p Missing packet header.\n", mb));
	n = sb->sb_lastrecord;
	/*
	 * If the queue is empty just set all pointers and proceed.
	 */
	if (n == NULL) {
		sb->sb_lastrecord = sb->sb_mb = sb->sb_sndptr = mb;
		for (; mb; mb = mb->m_next) {
	                sb->sb_mbtail = mb;
			sballoc(sb, mb);
		}
		return;
	}
	/*
	 * Count the number of mbufs in the current tail.
	 */
	for (ncnt = 0; n->m_next; n = n->m_next)
		ncnt++;
	n = sb->sb_lastrecord;
	/*
	 * If the two chains can fit in a single sdp packet and
	 * the last record has not been sent yet (WRITABLE) coalesce
	 * them.  The lastrecord remains the same but we must strip the
	 * packet header and then let sbcompress do the hard part.
	 */
	if (M_WRITABLE(n) && ncnt + cnt < SDP_MAX_SEND_SGES &&
	    n->m_pkthdr.len + mb->m_pkthdr.len - SDP_HEAD_SIZE <
	    ssk->xmit_size_goal) {
		m_adj(mb, SDP_HEAD_SIZE);
		n->m_pkthdr.len += mb->m_pkthdr.len;
		n->m_flags |= mb->m_flags & (M_PUSH | M_URG);
		m_demote(mb, 1, 0);
		sbcompress(sb, mb, sb->sb_mbtail);
		return;
	}
	/*
	 * Not compressible, just append to the end and adjust counters.
	 */
	sb->sb_lastrecord->m_flags |= M_PUSH;
	sb->sb_lastrecord->m_nextpkt = mb;
	sb->sb_lastrecord = mb;
	if (sb->sb_sndptr == NULL)
		sb->sb_sndptr = mb;
	for (; mb; mb = mb->m_next) {
		sb->sb_mbtail = mb;
		sballoc(sb, mb);
	}
}

/*
 * Do a send by putting data in output queue and updating urgent
 * marker if URG set.  Possibly send more data.  Unlike the other
 * pru_*() routines, the mbuf chains are our responsibility.  We
 * must either enqueue them or free them.  The other pru_* routines
 * generally are caller-frees.
 *
 * This comes from sendfile, normal sends will come from sdp_sosend().
 */
static int
sdp_send(struct socket *so, int flags, struct mbuf *m,
    struct sockaddr *nam, struct mbuf *control, struct thread *td)
{
	struct sdp_sock *ssk;
	struct mbuf *n;
	int error;
	int cnt;

	error = 0;
	ssk = sdp_sk(so);
	KASSERT(m->m_flags & M_PKTHDR,
	    ("sdp_send: %p no packet header", m));
	M_PREPEND(m, SDP_HEAD_SIZE, M_WAITOK);
	mtod(m, struct sdp_bsdh *)->mid = SDP_MID_DATA; 
	for (n = m, cnt = 0; n->m_next; n = n->m_next)
		cnt++;
	if (cnt > SDP_MAX_SEND_SGES) {
		n = m_collapse(m, M_WAITOK, SDP_MAX_SEND_SGES);
		if (n == NULL) {
			m_freem(m);
			return (EMSGSIZE);
		}
		m = n;
		for (cnt = 0; n->m_next; n = n->m_next)
			cnt++;
	}
	SDP_WLOCK(ssk);
	if (ssk->flags & (SDP_TIMEWAIT | SDP_DROPPED)) {
		if (control)
			m_freem(control);
		if (m)
			m_freem(m);
		error = ECONNRESET;
		goto out;
	}
	if (control) {
		/* SDP doesn't support control messages. */
		if (control->m_len) {
			m_freem(control);
			if (m)
				m_freem(m);
			error = EINVAL;
			goto out;
		}
		m_freem(control);	/* empty control, just free it */
	}
	if (!(flags & PRUS_OOB)) {
		SOCKBUF_LOCK(&so->so_snd);
		sdp_append(ssk, &so->so_snd, m, cnt);
		SOCKBUF_UNLOCK(&so->so_snd);
		if (nam && ssk->state < TCPS_SYN_SENT) {
			/*
			 * Do implied connect if not yet connected.
			 */
			error = sdp_start_connect(ssk, nam, td);
			if (error)
				goto out;
		}
		if (flags & PRUS_EOF) {
			/*
			 * Close the send side of the connection after
			 * the data is sent.
			 */
			socantsendmore(so);
			sdp_usrclosed(ssk);
			if (!(ssk->flags & SDP_DROPPED))
				sdp_output_disconnect(ssk);
		} else if (!(ssk->flags & SDP_DROPPED) &&
		    !(flags & PRUS_MORETOCOME))
			sdp_post_sends(ssk, M_NOWAIT);
		SDP_WUNLOCK(ssk);
		return (0);
	} else {
		SOCKBUF_LOCK(&so->so_snd);
		if (sbspace(&so->so_snd) < -512) {
			SOCKBUF_UNLOCK(&so->so_snd);
			m_freem(m);
			error = ENOBUFS;
			goto out;
		}
		/*
		 * According to RFC961 (Assigned Protocols),
		 * the urgent pointer points to the last octet
		 * of urgent data.  We continue, however,
		 * to consider it to indicate the first octet
		 * of data past the urgent section.
		 * Otherwise, snd_up should be one lower.
		 */
		m->m_flags |= M_URG | M_PUSH;
		sdp_append(ssk, &so->so_snd, m, cnt);
		SOCKBUF_UNLOCK(&so->so_snd);
		if (nam && ssk->state < TCPS_SYN_SENT) {
			/*
			 * Do implied connect if not yet connected.
			 */
			error = sdp_start_connect(ssk, nam, td);
			if (error)
				goto out;
		}
		sdp_post_sends(ssk, M_NOWAIT);
		SDP_WUNLOCK(ssk);
		return (0);
	}
out:
	SDP_WUNLOCK(ssk);
	return (error);
}

#define	SBLOCKWAIT(f)	(((f) & MSG_DONTWAIT) ? 0 : SBL_WAIT)

/*
 * Send on a socket.  If send must go all at once and message is larger than
 * send buffering, then hard error.  Lock against other senders.  If must go
 * all at once and not enough room now, then inform user that this would
 * block and do nothing.  Otherwise, if nonblocking, send as much as
 * possible.  The data to be sent is described by "uio" if nonzero, otherwise
 * by the mbuf chain "top" (which must be null if uio is not).  Data provided
 * in mbuf chain must be small enough to send all at once.
 *
 * Returns nonzero on error, timeout or signal; callers must check for short
 * counts if EINTR/ERESTART are returned.  Data and control buffers are freed
 * on return.
 */
static int
sdp_sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
    struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
{
	struct sdp_sock *ssk;
	long space, resid;
	int atomic;
	int error;
	int copy;

	if (uio != NULL)
		resid = uio->uio_resid;
	else
		resid = top->m_pkthdr.len;
	atomic = top != NULL;
	if (control != NULL) {
		if (control->m_len) {
			m_freem(control);
			if (top)
				m_freem(top);
			return (EINVAL);
		}
		m_freem(control);
		control = NULL;
	}
	/*
	 * In theory resid should be unsigned.  However, space must be
	 * signed, as it might be less than 0 if we over-committed, and we
	 * must use a signed comparison of space and resid.  On the other
	 * hand, a negative resid causes us to loop sending 0-length
	 * segments to the protocol.
	 *
	 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
	 * type sockets since that's an error.
	 */
	if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) {
		error = EINVAL;
		goto out;
	}
	if (td != NULL)
		td->td_ru.ru_msgsnd++;

	ssk = sdp_sk(so);
	error = sblock(&so->so_snd, SBLOCKWAIT(flags));
	if (error)
		goto out;

restart:
	do {
		SOCKBUF_LOCK(&so->so_snd);
		if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
			SOCKBUF_UNLOCK(&so->so_snd);
			error = EPIPE;
			goto release;
		}
		if (so->so_error) {
			error = so->so_error;
			so->so_error = 0;
			SOCKBUF_UNLOCK(&so->so_snd);
			goto release;
		}
		if ((so->so_state & SS_ISCONNECTED) == 0 && addr == NULL) {
			SOCKBUF_UNLOCK(&so->so_snd);
			error = ENOTCONN;
			goto release;
		}
		space = sbspace(&so->so_snd);
		if (flags & MSG_OOB)
			space += 1024;
		if (atomic && resid > ssk->xmit_size_goal - SDP_HEAD_SIZE) {
			SOCKBUF_UNLOCK(&so->so_snd);
			error = EMSGSIZE;
			goto release;
		}
		if (space < resid &&
		    (atomic || space < so->so_snd.sb_lowat)) {
			if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
				SOCKBUF_UNLOCK(&so->so_snd);
				error = EWOULDBLOCK;
				goto release;
			}
			error = sbwait(&so->so_snd);
			SOCKBUF_UNLOCK(&so->so_snd);
			if (error)
				goto release;
			goto restart;
		}
		SOCKBUF_UNLOCK(&so->so_snd);
		do {
			if (uio == NULL) {
				resid = 0;
				if (flags & MSG_EOR)
					top->m_flags |= M_EOR;
			} else {
				/*
				 * Copy the data from userland into a mbuf
				 * chain.  If no data is to be copied in,
				 * a single empty mbuf is returned.
				 */
				copy = min(space,
				    ssk->xmit_size_goal - SDP_HEAD_SIZE);
				top = m_uiotombuf(uio, M_WAITOK, copy,
				    0, M_PKTHDR |
				    ((flags & MSG_EOR) ? M_EOR : 0));
				if (top == NULL) {
					/* only possible error */
					error = EFAULT;
					goto release;
				}
				space -= resid - uio->uio_resid;
				resid = uio->uio_resid;
			}
			/*
			 * XXX all the SBS_CANTSENDMORE checks previously
			 * done could be out of date after dropping the
			 * socket lock.
			 */
			error = sdp_send(so, (flags & MSG_OOB) ? PRUS_OOB :
			/*
			 * Set EOF on the last send if the user specified
			 * MSG_EOF.
			 */
			    ((flags & MSG_EOF) && (resid <= 0)) ? PRUS_EOF :
			/* If there is more to send set PRUS_MORETOCOME. */
			    (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
			    top, addr, NULL, td);
			top = NULL;
			if (error)
				goto release;
		} while (resid && space > 0);
	} while (resid);

release:
	sbunlock(&so->so_snd);
out:
	if (top != NULL)
		m_freem(top);
	return (error);
}

/*
 * The part of soreceive() that implements reading non-inline out-of-band
 * data from a socket.  For more complete comments, see soreceive(), from
 * which this code originated.
 *
 * Note that soreceive_rcvoob(), unlike the remainder of soreceive(), is
 * unable to return an mbuf chain to the caller.
 */
static int
soreceive_rcvoob(struct socket *so, struct uio *uio, int flags)
{
	struct protosw *pr = so->so_proto;
	struct mbuf *m;
	int error;

	KASSERT(flags & MSG_OOB, ("soreceive_rcvoob: (flags & MSG_OOB) == 0"));

	m = m_get(M_WAITOK, MT_DATA);
	error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK);
	if (error)
		goto bad;
	do {
		error = uiomove(mtod(m, void *),
		    (int) min(uio->uio_resid, m->m_len), uio);
		m = m_free(m);
	} while (uio->uio_resid && error == 0 && m);
bad:
	if (m != NULL)
		m_freem(m);
	return (error);
}

/*
 * Optimized version of soreceive() for stream (TCP) sockets.
 */
static int
sdp_sorecv(struct socket *so, struct sockaddr **psa, struct uio *uio,
    struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
{
	int len = 0, error = 0, flags, oresid;
	struct sockbuf *sb;
	struct mbuf *m, *n = NULL;
	struct sdp_sock *ssk;

	/* We only do stream sockets. */
	if (so->so_type != SOCK_STREAM)
		return (EINVAL);
	if (psa != NULL)
		*psa = NULL;
	if (controlp != NULL)
		return (EINVAL);
	if (flagsp != NULL)
		flags = *flagsp &~ MSG_EOR;
	else
		flags = 0;
	if (flags & MSG_OOB)
		return (soreceive_rcvoob(so, uio, flags));
	if (mp0 != NULL)
		*mp0 = NULL;

	sb = &so->so_rcv;
	ssk = sdp_sk(so);

	/* Prevent other readers from entering the socket. */
	error = sblock(sb, SBLOCKWAIT(flags));
	if (error)
		goto out;
	SOCKBUF_LOCK(sb);

	/* Easy one, no space to copyout anything. */
	if (uio->uio_resid == 0) {
		error = EINVAL;
		goto out;
	}
	oresid = uio->uio_resid;

	/* We will never ever get anything unless we are connected. */
	if (!(so->so_state & (SS_ISCONNECTED|SS_ISDISCONNECTED))) {
		/* When disconnecting there may be still some data left. */
		if (sbavail(sb))
			goto deliver;
		if (!(so->so_state & SS_ISDISCONNECTED))
			error = ENOTCONN;
		goto out;
	}

	/* Socket buffer is empty and we shall not block. */
	if (sbavail(sb) == 0 &&
	    ((so->so_state & SS_NBIO) || (flags & (MSG_DONTWAIT|MSG_NBIO)))) {
		error = EAGAIN;
		goto out;
	}

restart:
	SOCKBUF_LOCK_ASSERT(&so->so_rcv);

	/* Abort if socket has reported problems. */
	if (so->so_error) {
		if (sbavail(sb))
			goto deliver;
		if (oresid > uio->uio_resid)
			goto out;
		error = so->so_error;
		if (!(flags & MSG_PEEK))
			so->so_error = 0;
		goto out;
	}

	/* Door is closed.  Deliver what is left, if any. */
	if (sb->sb_state & SBS_CANTRCVMORE) {
		if (sbavail(sb))
			goto deliver;
		else
			goto out;
	}

	/* Socket buffer got some data that we shall deliver now. */
	if (sbavail(sb) && !(flags & MSG_WAITALL) &&
	    ((so->so_state & SS_NBIO) ||
	     (flags & (MSG_DONTWAIT|MSG_NBIO)) ||
	     sbavail(sb) >= sb->sb_lowat ||
	     sbavail(sb) >= uio->uio_resid ||
	     sbavail(sb) >= sb->sb_hiwat) ) {
		goto deliver;
	}

	/* On MSG_WAITALL we must wait until all data or error arrives. */
	if ((flags & MSG_WAITALL) &&
	    (sbavail(sb) >= uio->uio_resid || sbavail(sb) >= sb->sb_lowat))
		goto deliver;

	/*
	 * Wait and block until (more) data comes in.
	 * NB: Drops the sockbuf lock during wait.
	 */
	error = sbwait(sb);
	if (error)
		goto out;
	goto restart;

deliver:
	SOCKBUF_LOCK_ASSERT(&so->so_rcv);
	KASSERT(sbavail(sb), ("%s: sockbuf empty", __func__));
	KASSERT(sb->sb_mb != NULL, ("%s: sb_mb == NULL", __func__));

	/* Statistics. */
	if (uio->uio_td)
		uio->uio_td->td_ru.ru_msgrcv++;

	/* Fill uio until full or current end of socket buffer is reached. */
	len = min(uio->uio_resid, sbavail(sb));
	if (mp0 != NULL) {
		/* Dequeue as many mbufs as possible. */
		if (!(flags & MSG_PEEK) && len >= sb->sb_mb->m_len) {
			for (*mp0 = m = sb->sb_mb;
			     m != NULL && m->m_len <= len;
			     m = m->m_next) {
				len -= m->m_len;
				uio->uio_resid -= m->m_len;
				sbfree(sb, m);
				n = m;
			}
			sb->sb_mb = m;
			if (sb->sb_mb == NULL)
				SB_EMPTY_FIXUP(sb);
			n->m_next = NULL;
		}
		/* Copy the remainder. */
		if (len > 0) {
			KASSERT(sb->sb_mb != NULL,
			    ("%s: len > 0 && sb->sb_mb empty", __func__));

			m = m_copym(sb->sb_mb, 0, len, M_NOWAIT);
			if (m == NULL)
				len = 0;	/* Don't flush data from sockbuf. */
			else
				uio->uio_resid -= m->m_len;
			if (*mp0 != NULL)
				n->m_next = m;
			else
				*mp0 = m;
			if (*mp0 == NULL) {
				error = ENOBUFS;
				goto out;
			}
		}
	} else {
		/* NB: Must unlock socket buffer as uiomove may sleep. */
		SOCKBUF_UNLOCK(sb);
		error = m_mbuftouio(uio, sb->sb_mb, len);
		SOCKBUF_LOCK(sb);
		if (error)
			goto out;
	}
	SBLASTRECORDCHK(sb);
	SBLASTMBUFCHK(sb);

	/*
	 * Remove the delivered data from the socket buffer unless we
	 * were only peeking.
	 */
	if (!(flags & MSG_PEEK)) {
		if (len > 0)
			sbdrop_locked(sb, len);

		/* Notify protocol that we drained some data. */
		SOCKBUF_UNLOCK(sb);
		SDP_WLOCK(ssk);
		sdp_do_posts(ssk);
		SDP_WUNLOCK(ssk);
		SOCKBUF_LOCK(sb);
	}

	/*
	 * For MSG_WAITALL we may have to loop again and wait for
	 * more data to come in.
	 */
	if ((flags & MSG_WAITALL) && uio->uio_resid > 0)
		goto restart;
out:
	SOCKBUF_LOCK_ASSERT(sb);
	SBLASTRECORDCHK(sb);
	SBLASTMBUFCHK(sb);
	SOCKBUF_UNLOCK(sb);
	sbunlock(sb);
	return (error);
}

/*
 * Abort is used to teardown a connection typically while sitting in
 * the accept queue.
 */
void
sdp_abort(struct socket *so)
{
	struct sdp_sock *ssk;

	ssk = sdp_sk(so);
	SDP_WLOCK(ssk);
	/*
	 * If we have not yet dropped, do it now.
	 */
	if (!(ssk->flags & SDP_TIMEWAIT) &&
	    !(ssk->flags & SDP_DROPPED))
		sdp_drop(ssk, ECONNABORTED);
	KASSERT(ssk->flags & SDP_DROPPED, ("sdp_abort: %p not dropped 0x%X",
	    ssk, ssk->flags));
	SDP_WUNLOCK(ssk);
}

/*
 * Close a SDP socket and initiate a friendly disconnect.
 */
static void
sdp_close(struct socket *so)
{
	struct sdp_sock *ssk;

	ssk = sdp_sk(so);
	SDP_WLOCK(ssk);
	/*
	 * If we have not yet dropped, do it now.
	 */
	if (!(ssk->flags & SDP_TIMEWAIT) &&
	    !(ssk->flags & SDP_DROPPED)) 
		sdp_start_disconnect(ssk);

	/*
	 * If we've still not dropped let the socket layer know we're
	 * holding on to the socket and pcb for a while.
	 */
	if (!(ssk->flags & SDP_DROPPED)) {
		SOCK_LOCK(so);
		so->so_state |= SS_PROTOREF;
		SOCK_UNLOCK(so);
		ssk->flags |= SDP_SOCKREF;
	}
	SDP_WUNLOCK(ssk);
}

/*
 * User requests out-of-band data.
 */
static int
sdp_rcvoob(struct socket *so, struct mbuf *m, int flags)
{
	int error = 0;
	struct sdp_sock *ssk;

	ssk = sdp_sk(so);
	SDP_WLOCK(ssk);
	if (!rx_ring_trylock(&ssk->rx_ring)) {
		SDP_WUNLOCK(ssk);
		return (ECONNRESET);
	}
	if (ssk->flags & (SDP_TIMEWAIT | SDP_DROPPED)) {
		error = ECONNRESET;
		goto out;
	}
	if ((so->so_oobmark == 0 &&
	     (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
	    so->so_options & SO_OOBINLINE ||
	    ssk->oobflags & SDP_HADOOB) {
		error = EINVAL;
		goto out;
	}
	if ((ssk->oobflags & SDP_HAVEOOB) == 0) {
		error = EWOULDBLOCK;
		goto out;
	}
	m->m_len = 1;
	*mtod(m, caddr_t) = ssk->iobc;
	if ((flags & MSG_PEEK) == 0)
		ssk->oobflags ^= (SDP_HAVEOOB | SDP_HADOOB);
out:
	rx_ring_unlock(&ssk->rx_ring);
	SDP_WUNLOCK(ssk);
	return (error);
}

void
sdp_urg(struct sdp_sock *ssk, struct mbuf *mb)
{
	struct mbuf *m;
	struct socket *so;

	so = ssk->socket;
	if (so == NULL)
		return;

	so->so_oobmark = sbused(&so->so_rcv) + mb->m_pkthdr.len - 1;
	sohasoutofband(so);
	ssk->oobflags &= ~(SDP_HAVEOOB | SDP_HADOOB);
	if (!(so->so_options & SO_OOBINLINE)) {
		for (m = mb; m->m_next != NULL; m = m->m_next);
		ssk->iobc = *(mtod(m, char *) + m->m_len - 1);
		ssk->oobflags |= SDP_HAVEOOB;
		m->m_len--;
		mb->m_pkthdr.len--;
	}
}

/*
 * Notify a sdp socket of an asynchronous error.
 *
 * Do not wake up user since there currently is no mechanism for
 * reporting soft errors (yet - a kqueue filter may be added).
 */
struct sdp_sock *
sdp_notify(struct sdp_sock *ssk, int error)
{

	SDP_WLOCK_ASSERT(ssk);

	if ((ssk->flags & SDP_TIMEWAIT) ||
	    (ssk->flags & SDP_DROPPED))
		return (ssk);

	/*
	 * Ignore some errors if we are hooked up.
	 */
	if (ssk->state == TCPS_ESTABLISHED &&
	    (error == EHOSTUNREACH || error == ENETUNREACH ||
	     error == EHOSTDOWN))
		return (ssk);
	ssk->softerror = error;
	return sdp_drop(ssk, error);
}

static void
sdp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
{
	struct in_addr faddr;

	faddr = ((struct sockaddr_in *)sa)->sin_addr;
	if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
		return;

	sdp_pcbnotifyall(faddr, inetctlerrmap[cmd], sdp_notify);
}

static int
sdp_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
    struct thread *td)
{
	return (EOPNOTSUPP);
}

static void
sdp_keepalive_timeout(void *data)
{
	struct sdp_sock *ssk;

	ssk = data;
	/* Callout canceled. */
        if (!callout_active(&ssk->keep2msl))
                return;
	/* Callout rescheduled as a different kind of timer. */
	if (callout_pending(&ssk->keep2msl))
		goto out;
        callout_deactivate(&ssk->keep2msl);
	if (ssk->flags & SDP_DROPPED ||
	    (ssk->socket->so_options & SO_KEEPALIVE) == 0)
		goto out;
	sdp_post_keepalive(ssk);
	callout_reset(&ssk->keep2msl, SDP_KEEPALIVE_TIME,
	    sdp_keepalive_timeout, ssk);
out:
	SDP_WUNLOCK(ssk);
}


void
sdp_start_keepalive_timer(struct socket *so)
{
	struct sdp_sock *ssk;

	ssk = sdp_sk(so);
	if (!callout_pending(&ssk->keep2msl))
                callout_reset(&ssk->keep2msl, SDP_KEEPALIVE_TIME,
                    sdp_keepalive_timeout, ssk);
}

static void
sdp_stop_keepalive_timer(struct socket *so)
{
	struct sdp_sock *ssk;

	ssk = sdp_sk(so);
	callout_stop(&ssk->keep2msl);
}

/*
 * sdp_ctloutput() must drop the inpcb lock before performing copyin on
 * socket option arguments.  When it re-acquires the lock after the copy, it
 * has to revalidate that the connection is still valid for the socket
 * option.
 */
#define SDP_WLOCK_RECHECK(inp) do {					\
	SDP_WLOCK(ssk);							\
	if (ssk->flags & (SDP_TIMEWAIT | SDP_DROPPED)) {		\
		SDP_WUNLOCK(ssk);					\
		return (ECONNRESET);					\
	}								\
} while(0)

static int
sdp_ctloutput(struct socket *so, struct sockopt *sopt)
{
	int	error, opt, optval;
	struct sdp_sock *ssk;

	error = 0;
	ssk = sdp_sk(so);
	if (sopt->sopt_level == SOL_SOCKET && sopt->sopt_name == SO_KEEPALIVE) {
		SDP_WLOCK(ssk);
		if (so->so_options & SO_KEEPALIVE)
			sdp_start_keepalive_timer(so);
		else
			sdp_stop_keepalive_timer(so);
		SDP_WUNLOCK(ssk);
	}
	if (sopt->sopt_level != IPPROTO_TCP)
		return (error);

	SDP_WLOCK(ssk);
	if (ssk->flags & (SDP_TIMEWAIT | SDP_DROPPED)) {
		SDP_WUNLOCK(ssk);
		return (ECONNRESET);
	}

	switch (sopt->sopt_dir) {
	case SOPT_SET:
		switch (sopt->sopt_name) {
		case TCP_NODELAY:
			SDP_WUNLOCK(ssk);
			error = sooptcopyin(sopt, &optval, sizeof optval,
			    sizeof optval);
			if (error)
				return (error);

			SDP_WLOCK_RECHECK(ssk);
			opt = SDP_NODELAY;
			if (optval)
				ssk->flags |= opt;
			else
				ssk->flags &= ~opt;
			sdp_do_posts(ssk);
			SDP_WUNLOCK(ssk);
			break;

		default:
			SDP_WUNLOCK(ssk);
			error = ENOPROTOOPT;
			break;
		}
		break;

	case SOPT_GET:
		switch (sopt->sopt_name) {
		case TCP_NODELAY:
			optval = ssk->flags & SDP_NODELAY;
			SDP_WUNLOCK(ssk);
			error = sooptcopyout(sopt, &optval, sizeof optval);
			break;
		default:
			SDP_WUNLOCK(ssk);
			error = ENOPROTOOPT;
			break;
		}
		break;
	}
	return (error);
}
#undef SDP_WLOCK_RECHECK

int sdp_mod_count = 0;
int sdp_mod_usec = 0;

void
sdp_set_default_moderation(struct sdp_sock *ssk)
{
	if (sdp_mod_count <= 0 || sdp_mod_usec <= 0)
		return;
	ib_modify_cq(ssk->rx_ring.cq, sdp_mod_count, sdp_mod_usec);
}


static void
sdp_dev_add(struct ib_device *device)
{
	struct ib_fmr_pool_param param;
	struct sdp_device *sdp_dev;

	sdp_dev = malloc(sizeof(*sdp_dev), M_SDP, M_WAITOK | M_ZERO);
	sdp_dev->pd = ib_alloc_pd(device);
	if (IS_ERR(sdp_dev->pd))
		goto out_pd;
        sdp_dev->mr = ib_get_dma_mr(sdp_dev->pd, IB_ACCESS_LOCAL_WRITE);
        if (IS_ERR(sdp_dev->mr))
		goto out_mr;
	memset(&param, 0, sizeof param);
	param.max_pages_per_fmr = SDP_FMR_SIZE;
	param.page_shift = PAGE_SHIFT;
	param.access = (IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ);
	param.pool_size = SDP_FMR_POOL_SIZE;
	param.dirty_watermark = SDP_FMR_DIRTY_SIZE;
	param.cache = 1;
	sdp_dev->fmr_pool = ib_create_fmr_pool(sdp_dev->pd, &param);
	if (IS_ERR(sdp_dev->fmr_pool))
		goto out_fmr;
	ib_set_client_data(device, &sdp_client, sdp_dev);
	return;

out_fmr:
	ib_dereg_mr(sdp_dev->mr);
out_mr:
	ib_dealloc_pd(sdp_dev->pd);
out_pd:
	free(sdp_dev, M_SDP);
}

static void
sdp_dev_rem(struct ib_device *device)
{
	struct sdp_device *sdp_dev;
	struct sdp_sock *ssk;

	SDP_LIST_WLOCK();
	LIST_FOREACH(ssk, &sdp_list, list) {
		if (ssk->ib_device != device)
			continue;
		SDP_WLOCK(ssk);
		if ((ssk->flags & SDP_DESTROY) == 0)
			ssk = sdp_notify(ssk, ECONNRESET);
		if (ssk)
			SDP_WUNLOCK(ssk);
	}
	SDP_LIST_WUNLOCK();
	/*
	 * XXX Do I need to wait between these two?
	 */
	sdp_dev = ib_get_client_data(device, &sdp_client);
	if (!sdp_dev)
		return;
	ib_flush_fmr_pool(sdp_dev->fmr_pool);
	ib_destroy_fmr_pool(sdp_dev->fmr_pool);
	ib_dereg_mr(sdp_dev->mr);
	ib_dealloc_pd(sdp_dev->pd);
	free(sdp_dev, M_SDP);
}

struct ib_client sdp_client =
    { .name = "sdp", .add = sdp_dev_add, .remove = sdp_dev_rem };


static int
sdp_pcblist(SYSCTL_HANDLER_ARGS)
{
	int error, n, i;
	struct sdp_sock *ssk;
	struct xinpgen xig;

	/*
	 * The process of preparing the TCB list is too time-consuming and
	 * resource-intensive to repeat twice on every request.
	 */
	if (req->oldptr == NULL) {
		n = sdp_count;
		n += imax(n / 8, 10);
		req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xtcpcb);
		return (0);
	}

	if (req->newptr != NULL)
		return (EPERM);

	/*
	 * OK, now we're committed to doing something.
	 */
	SDP_LIST_RLOCK();
	n = sdp_count;
	SDP_LIST_RUNLOCK();

	error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
		+ n * sizeof(struct xtcpcb));
	if (error != 0)
		return (error);

	xig.xig_len = sizeof xig;
	xig.xig_count = n;
	xig.xig_gen = 0;
	xig.xig_sogen = so_gencnt;
	error = SYSCTL_OUT(req, &xig, sizeof xig);
	if (error)
		return (error);

	SDP_LIST_RLOCK();
	for (ssk = LIST_FIRST(&sdp_list), i = 0;
	    ssk != NULL && i < n; ssk = LIST_NEXT(ssk, list)) {
		struct xtcpcb xt;

		SDP_RLOCK(ssk);
		if (ssk->flags & SDP_TIMEWAIT) {
			if (ssk->cred != NULL)
				error = cr_cansee(req->td->td_ucred,
				    ssk->cred);
			else
				error = EINVAL;	/* Skip this inp. */
		} else if (ssk->socket)
			error = cr_canseesocket(req->td->td_ucred,
			    ssk->socket);
		else
			error = EINVAL;
		if (error) {
			error = 0;
			goto next;
		}

		bzero(&xt, sizeof(xt));
		xt.xt_len = sizeof xt;
		xt.xt_inp.inp_gencnt = 0;
		xt.xt_inp.inp_vflag = INP_IPV4;
		memcpy(&xt.xt_inp.inp_laddr, &ssk->laddr, sizeof(ssk->laddr));
		xt.xt_inp.inp_lport = ssk->lport;
		memcpy(&xt.xt_inp.inp_faddr, &ssk->faddr, sizeof(ssk->faddr));
		xt.xt_inp.inp_fport = ssk->fport;
		xt.xt_tp.t_state = ssk->state;
		if (ssk->socket != NULL)
			sotoxsocket(ssk->socket, &xt.xt_socket);
		else
			bzero(&xt.xt_socket, sizeof xt.xt_socket);
		xt.xt_socket.xso_protocol = IPPROTO_TCP;
		SDP_RUNLOCK(ssk);
		error = SYSCTL_OUT(req, &xt, sizeof xt);
		if (error)
			break;
		i++;
		continue;
next:
		SDP_RUNLOCK(ssk);
	}
	if (!error) {
		/*
		 * Give the user an updated idea of our state.
		 * If the generation differs from what we told
		 * her before, she knows that something happened
		 * while we were processing this request, and it
		 * might be necessary to retry.
		 */
		xig.xig_gen = 0;
		xig.xig_sogen = so_gencnt;
		xig.xig_count = sdp_count;
		error = SYSCTL_OUT(req, &xig, sizeof xig);
	}
	SDP_LIST_RUNLOCK();
	return (error);
}

static SYSCTL_NODE(_net_inet, -1,  sdp,    CTLFLAG_RW, 0,  "SDP");

SYSCTL_PROC(_net_inet_sdp, TCPCTL_PCBLIST, pcblist,
    CTLFLAG_RD | CTLTYPE_STRUCT, 0, 0, sdp_pcblist, "S,xtcpcb",
    "List of active SDP connections");

static void
sdp_zone_change(void *tag)
{

	uma_zone_set_max(sdp_zone, maxsockets);
}

static void
sdp_init(void)
{

	LIST_INIT(&sdp_list);
	sdp_zone = uma_zcreate("sdp_sock", sizeof(struct sdp_sock),
	    NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
	uma_zone_set_max(sdp_zone, maxsockets);
	EVENTHANDLER_REGISTER(maxsockets_change, sdp_zone_change, NULL,
		EVENTHANDLER_PRI_ANY);
	rx_comp_wq = create_singlethread_workqueue("rx_comp_wq");
	ib_register_client(&sdp_client);
}

extern struct domain sdpdomain;

struct pr_usrreqs sdp_usrreqs = {
	.pru_abort =		sdp_abort,
	.pru_accept =		sdp_accept,
	.pru_attach =		sdp_attach,
	.pru_bind =		sdp_bind,
	.pru_connect =		sdp_connect,
	.pru_control =		sdp_control,
	.pru_detach =		sdp_detach,
	.pru_disconnect =	sdp_disconnect,
	.pru_listen =		sdp_listen,
	.pru_peeraddr =		sdp_getpeeraddr,
	.pru_rcvoob =		sdp_rcvoob,
	.pru_send =		sdp_send,
	.pru_sosend =		sdp_sosend,
	.pru_soreceive =	sdp_sorecv,
	.pru_shutdown =		sdp_shutdown,
	.pru_sockaddr =		sdp_getsockaddr,
	.pru_close =		sdp_close,
};

struct protosw sdpsw[] = {
{
	.pr_type =		SOCK_STREAM,
	.pr_domain =		&sdpdomain,
	.pr_protocol =		IPPROTO_IP,
	.pr_flags =		PR_CONNREQUIRED|PR_IMPLOPCL|PR_WANTRCVD,
	.pr_ctlinput =		sdp_ctlinput,
	.pr_ctloutput =		sdp_ctloutput,
	.pr_usrreqs =		&sdp_usrreqs
},
{
	.pr_type =		SOCK_STREAM,
	.pr_domain =		&sdpdomain,
	.pr_protocol =		IPPROTO_TCP,
	.pr_flags =		PR_CONNREQUIRED|PR_IMPLOPCL|PR_WANTRCVD,
	.pr_ctlinput =		sdp_ctlinput,
	.pr_ctloutput =		sdp_ctloutput,
	.pr_usrreqs =		&sdp_usrreqs
},
};

struct domain sdpdomain = {
	.dom_family =		AF_INET_SDP,
	.dom_name =		"SDP",
	.dom_init =		sdp_init,
	.dom_protosw =		sdpsw,
	.dom_protoswNPROTOSW =	&sdpsw[sizeof(sdpsw)/sizeof(sdpsw[0])],
};

DOMAIN_SET(sdp);

int sdp_debug_level = 1;
int sdp_data_debug_level = 0;