aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/ulp/ipoib/ipoib_main.c
blob: ee9f5d281b37c72ca4cc6fcedb7776fd160cd149 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
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
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - 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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "ipoib.h"

#include <linux/module.h>

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/vmalloc.h>

#include <linux/if_arp.h>	/* For ARPHRD_xxx */

#include <linux/ip.h>
#include <linux/in.h>

#include <linux/jhash.h>
#include <net/arp.h>
#include <net/addrconf.h>
#include <linux/inetdevice.h>
#include <rdma/ib_cache.h>
#include <linux/pci.h>

#define DRV_VERSION "1.0.0"

const char ipoib_driver_version[] = DRV_VERSION;

MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
MODULE_LICENSE("Dual BSD/GPL");

int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;

module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
int ipoib_debug_level;

module_param_named(debug_level, ipoib_debug_level, int, 0644);
MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
#endif

struct ipoib_path_iter {
	struct net_device *dev;
	struct ipoib_path  path;
};

static const u8 ipv4_bcast_addr[] = {
	0x00, 0xff, 0xff, 0xff,
	0xff, 0x12, 0x40, 0x1b,	0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00,	0xff, 0xff, 0xff, 0xff
};

struct workqueue_struct *ipoib_workqueue;

struct ib_sa_client ipoib_sa_client;

static void ipoib_add_one(struct ib_device *device);
static void ipoib_remove_one(struct ib_device *device, void *client_data);
static void ipoib_neigh_reclaim(struct rcu_head *rp);
static struct net_device *ipoib_get_net_dev_by_params(
		struct ib_device *dev, u8 port, u16 pkey,
		const union ib_gid *gid, const struct sockaddr *addr,
		void *client_data);
static int ipoib_set_mac(struct net_device *dev, void *addr);

static struct ib_client ipoib_client = {
	.name   = "ipoib",
	.add    = ipoib_add_one,
	.remove = ipoib_remove_one,
	.get_net_dev_by_params = ipoib_get_net_dev_by_params,
};

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
static int ipoib_netdev_event(struct notifier_block *this,
			      unsigned long event, void *ptr)
{
	struct netdev_notifier_info *ni = ptr;
	struct net_device *dev = ni->dev;

	if (dev->netdev_ops->ndo_open != ipoib_open)
		return NOTIFY_DONE;

	switch (event) {
	case NETDEV_REGISTER:
		ipoib_create_debug_files(dev);
		break;
	case NETDEV_CHANGENAME:
		ipoib_delete_debug_files(dev);
		ipoib_create_debug_files(dev);
		break;
	case NETDEV_UNREGISTER:
		ipoib_delete_debug_files(dev);
		break;
	}

	return NOTIFY_DONE;
}
#endif

int ipoib_open(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	ipoib_dbg(priv, "bringing up interface\n");

	netif_carrier_off(dev);

	set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);

	priv->sm_fullmember_sendonly_support = false;

	if (ipoib_ib_dev_open(dev)) {
		if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
			return 0;
		goto err_disable;
	}

	ipoib_ib_dev_up(dev);

	if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
		struct ipoib_dev_priv *cpriv;

		/* Bring up any child interfaces too */
		down_read(&priv->vlan_rwsem);
		list_for_each_entry(cpriv, &priv->child_intfs, list) {
			int flags;

			flags = cpriv->dev->flags;
			if (flags & IFF_UP)
				continue;

			dev_change_flags(cpriv->dev, flags | IFF_UP);
		}
		up_read(&priv->vlan_rwsem);
	}

	netif_start_queue(dev);

	return 0;

err_disable:
	clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);

	return -EINVAL;
}

static int ipoib_stop(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	ipoib_dbg(priv, "stopping interface\n");

	clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);

	netif_stop_queue(dev);

	ipoib_ib_dev_down(dev);
	ipoib_ib_dev_stop(dev);

	if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
		struct ipoib_dev_priv *cpriv;

		/* Bring down any child interfaces too */
		down_read(&priv->vlan_rwsem);
		list_for_each_entry(cpriv, &priv->child_intfs, list) {
			int flags;

			flags = cpriv->dev->flags;
			if (!(flags & IFF_UP))
				continue;

			dev_change_flags(cpriv->dev, flags & ~IFF_UP);
		}
		up_read(&priv->vlan_rwsem);
	}

	return 0;
}

static void ipoib_uninit(struct net_device *dev)
{
	ipoib_dev_cleanup(dev);
}

static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
		features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);

	return features;
}

static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	int ret = 0;

	/* dev->mtu > 2K ==> connected mode */
	if (ipoib_cm_admin_enabled(dev)) {
		if (new_mtu > ipoib_cm_max_mtu(dev))
			return -EINVAL;

		if (new_mtu > priv->mcast_mtu)
			ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
				   priv->mcast_mtu);

		dev->mtu = new_mtu;
		return 0;
	}

	if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
		return -EINVAL;

	priv->admin_mtu = new_mtu;

	if (priv->mcast_mtu < priv->admin_mtu)
		ipoib_dbg(priv, "MTU must be smaller than the underlying "
				"link layer MTU - 4 (%u)\n", priv->mcast_mtu);

	new_mtu = min(priv->mcast_mtu, priv->admin_mtu);

	if (priv->rn_ops->ndo_change_mtu) {
		bool carrier_status = netif_carrier_ok(dev);

		netif_carrier_off(dev);

		/* notify lower level on the real mtu */
		ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu);

		if (carrier_status)
			netif_carrier_on(dev);
	} else {
		dev->mtu = new_mtu;
	}

	return ret;
}

static void ipoib_get_stats(struct net_device *dev,
			    struct rtnl_link_stats64 *stats)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	if (priv->rn_ops->ndo_get_stats64)
		priv->rn_ops->ndo_get_stats64(dev, stats);
	else
		netdev_stats_to_stats64(stats, &dev->stats);
}

/* Called with an RCU read lock taken */
static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
					struct net_device *dev)
{
	struct net *net = dev_net(dev);
	struct in_device *in_dev;
	struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
	struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
	__be32 ret_addr;

	switch (addr->sa_family) {
	case AF_INET:
		in_dev = in_dev_get(dev);
		if (!in_dev)
			return false;

		ret_addr = inet_confirm_addr(net, in_dev, 0,
					     addr_in->sin_addr.s_addr,
					     RT_SCOPE_HOST);
		in_dev_put(in_dev);
		if (ret_addr)
			return true;

		break;
	case AF_INET6:
		if (IS_ENABLED(CONFIG_IPV6) &&
		    ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
			return true;

		break;
	}
	return false;
}

/**
 * Find the master net_device on top of the given net_device.
 * @dev: base IPoIB net_device
 *
 * Returns the master net_device with a reference held, or the same net_device
 * if no master exists.
 */
static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
{
	struct net_device *master;

	rcu_read_lock();
	master = netdev_master_upper_dev_get_rcu(dev);
	if (master)
		dev_hold(master);
	rcu_read_unlock();

	if (master)
		return master;

	dev_hold(dev);
	return dev;
}

struct ipoib_walk_data {
	const struct sockaddr *addr;
	struct net_device *result;
};

static int ipoib_upper_walk(struct net_device *upper, void *_data)
{
	struct ipoib_walk_data *data = _data;
	int ret = 0;

	if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) {
		dev_hold(upper);
		data->result = upper;
		ret = 1;
	}

	return ret;
}

/**
 * Find a net_device matching the given address, which is an upper device of
 * the given net_device.
 * @addr: IP address to look for.
 * @dev: base IPoIB net_device
 *
 * If found, returns the net_device with a reference held. Otherwise return
 * NULL.
 */
static struct net_device *ipoib_get_net_dev_match_addr(
		const struct sockaddr *addr, struct net_device *dev)
{
	struct ipoib_walk_data data = {
		.addr = addr,
	};

	rcu_read_lock();
	if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
		dev_hold(dev);
		data.result = dev;
		goto out;
	}

	netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &data);
out:
	rcu_read_unlock();
	return data.result;
}

/* returns the number of IPoIB netdevs on top a given ipoib device matching a
 * pkey_index and address, if one exists.
 *
 * @found_net_dev: contains a matching net_device if the return value >= 1,
 * with a reference held. */
static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
				     const union ib_gid *gid,
				     u16 pkey_index,
				     const struct sockaddr *addr,
				     int nesting,
				     struct net_device **found_net_dev)
{
	struct ipoib_dev_priv *child_priv;
	struct net_device *net_dev = NULL;
	int matches = 0;

	if (priv->pkey_index == pkey_index &&
	    (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
		if (!addr) {
			net_dev = ipoib_get_master_net_dev(priv->dev);
		} else {
			/* Verify the net_device matches the IP address, as
			 * IPoIB child devices currently share a GID. */
			net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
		}
		if (net_dev) {
			if (!*found_net_dev)
				*found_net_dev = net_dev;
			else
				dev_put(net_dev);
			++matches;
		}
	}

	/* Check child interfaces */
	down_read_nested(&priv->vlan_rwsem, nesting);
	list_for_each_entry(child_priv, &priv->child_intfs, list) {
		matches += ipoib_match_gid_pkey_addr(child_priv, gid,
						    pkey_index, addr,
						    nesting + 1,
						    found_net_dev);
		if (matches > 1)
			break;
	}
	up_read(&priv->vlan_rwsem);

	return matches;
}

/* Returns the number of matching net_devs found (between 0 and 2). Also
 * return the matching net_device in the @net_dev parameter, holding a
 * reference to the net_device, if the number of matches >= 1 */
static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
					 u16 pkey_index,
					 const union ib_gid *gid,
					 const struct sockaddr *addr,
					 struct net_device **net_dev)
{
	struct ipoib_dev_priv *priv;
	int matches = 0;

	*net_dev = NULL;

	list_for_each_entry(priv, dev_list, list) {
		if (priv->port != port)
			continue;

		matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
						     addr, 0, net_dev);
		if (matches > 1)
			break;
	}

	return matches;
}

static struct net_device *ipoib_get_net_dev_by_params(
		struct ib_device *dev, u8 port, u16 pkey,
		const union ib_gid *gid, const struct sockaddr *addr,
		void *client_data)
{
	struct net_device *net_dev;
	struct list_head *dev_list = client_data;
	u16 pkey_index;
	int matches;
	int ret;

	if (!rdma_protocol_ib(dev, port))
		return NULL;

	ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
	if (ret)
		return NULL;

	if (!dev_list)
		return NULL;

	/* See if we can find a unique device matching the L2 parameters */
	matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
						gid, NULL, &net_dev);

	switch (matches) {
	case 0:
		return NULL;
	case 1:
		return net_dev;
	}

	dev_put(net_dev);

	/* Couldn't find a unique device with L2 parameters only. Use L3
	 * address to uniquely match the net device */
	matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
						gid, addr, &net_dev);
	switch (matches) {
	case 0:
		return NULL;
	default:
		dev_warn_ratelimited(&dev->dev,
				     "duplicate IP address detected\n");
		/* Fall through */
	case 1:
		return net_dev;
	}
}

int ipoib_set_mode(struct net_device *dev, const char *buf)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
	     !strcmp(buf, "connected\n")) ||
	     (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
	     !strcmp(buf, "datagram\n"))) {
		return 0;
	}

	/* flush paths if we switch modes so that connections are restarted */
	if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
		set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
		ipoib_warn(priv, "enabling connected mode "
			   "will cause multicast packet drops\n");
		netdev_update_features(dev);
		dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
		rtnl_unlock();
		priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;

		ipoib_flush_paths(dev);
		return (!rtnl_trylock()) ? -EBUSY : 0;
	}

	if (!strcmp(buf, "datagram\n")) {
		clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
		netdev_update_features(dev);
		dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
		rtnl_unlock();
		ipoib_flush_paths(dev);
		return (!rtnl_trylock()) ? -EBUSY : 0;
	}

	return -EINVAL;
}

struct ipoib_path *__path_find(struct net_device *dev, void *gid)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct rb_node *n = priv->path_tree.rb_node;
	struct ipoib_path *path;
	int ret;

	while (n) {
		path = rb_entry(n, struct ipoib_path, rb_node);

		ret = memcmp(gid, path->pathrec.dgid.raw,
			     sizeof (union ib_gid));

		if (ret < 0)
			n = n->rb_left;
		else if (ret > 0)
			n = n->rb_right;
		else
			return path;
	}

	return NULL;
}

static int __path_add(struct net_device *dev, struct ipoib_path *path)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct rb_node **n = &priv->path_tree.rb_node;
	struct rb_node *pn = NULL;
	struct ipoib_path *tpath;
	int ret;

	while (*n) {
		pn = *n;
		tpath = rb_entry(pn, struct ipoib_path, rb_node);

		ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
			     sizeof (union ib_gid));
		if (ret < 0)
			n = &pn->rb_left;
		else if (ret > 0)
			n = &pn->rb_right;
		else
			return -EEXIST;
	}

	rb_link_node(&path->rb_node, pn, n);
	rb_insert_color(&path->rb_node, &priv->path_tree);

	list_add_tail(&path->list, &priv->path_list);

	return 0;
}

static void path_free(struct net_device *dev, struct ipoib_path *path)
{
	struct sk_buff *skb;

	while ((skb = __skb_dequeue(&path->queue)))
		dev_kfree_skb_irq(skb);

	ipoib_dbg(ipoib_priv(dev), "path_free\n");

	/* remove all neigh connected to this path */
	ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);

	if (path->ah)
		ipoib_put_ah(path->ah);

	kfree(path);
}

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG

struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
{
	struct ipoib_path_iter *iter;

	iter = kmalloc(sizeof *iter, GFP_KERNEL);
	if (!iter)
		return NULL;

	iter->dev = dev;
	memset(iter->path.pathrec.dgid.raw, 0, 16);

	if (ipoib_path_iter_next(iter)) {
		kfree(iter);
		return NULL;
	}

	return iter;
}

int ipoib_path_iter_next(struct ipoib_path_iter *iter)
{
	struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
	struct rb_node *n;
	struct ipoib_path *path;
	int ret = 1;

	spin_lock_irq(&priv->lock);

	n = rb_first(&priv->path_tree);

	while (n) {
		path = rb_entry(n, struct ipoib_path, rb_node);

		if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
			   sizeof (union ib_gid)) < 0) {
			iter->path = *path;
			ret = 0;
			break;
		}

		n = rb_next(n);
	}

	spin_unlock_irq(&priv->lock);

	return ret;
}

void ipoib_path_iter_read(struct ipoib_path_iter *iter,
			  struct ipoib_path *path)
{
	*path = iter->path;
}

#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */

void ipoib_mark_paths_invalid(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct ipoib_path *path, *tp;

	spin_lock_irq(&priv->lock);

	list_for_each_entry_safe(path, tp, &priv->path_list, list) {
		ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n",
			  be32_to_cpu(sa_path_get_dlid(&path->pathrec)),
			  path->pathrec.dgid.raw);
		path->valid =  0;
	}

	spin_unlock_irq(&priv->lock);
}

static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
{
	struct ipoib_pseudo_header *phdr;

	phdr = skb_push(skb, sizeof(*phdr));
	memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
}

void ipoib_flush_paths(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct ipoib_path *path, *tp;
	LIST_HEAD(remove_list);
	unsigned long flags;

	netif_tx_lock_bh(dev);
	spin_lock_irqsave(&priv->lock, flags);

	list_splice_init(&priv->path_list, &remove_list);

	list_for_each_entry(path, &remove_list, list)
		rb_erase(&path->rb_node, &priv->path_tree);

	list_for_each_entry_safe(path, tp, &remove_list, list) {
		if (path->query)
			ib_sa_cancel_query(path->query_id, path->query);
		spin_unlock_irqrestore(&priv->lock, flags);
		netif_tx_unlock_bh(dev);
		wait_for_completion(&path->done);
		path_free(dev, path);
		netif_tx_lock_bh(dev);
		spin_lock_irqsave(&priv->lock, flags);
	}

	spin_unlock_irqrestore(&priv->lock, flags);
	netif_tx_unlock_bh(dev);
}

static void path_rec_completion(int status,
				struct sa_path_rec *pathrec,
				void *path_ptr)
{
	struct ipoib_path *path = path_ptr;
	struct net_device *dev = path->dev;
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct ipoib_ah *ah = NULL;
	struct ipoib_ah *old_ah = NULL;
	struct ipoib_neigh *neigh, *tn;
	struct sk_buff_head skqueue;
	struct sk_buff *skb;
	unsigned long flags;

	if (!status)
		ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
			  be32_to_cpu(sa_path_get_dlid(pathrec)),
			  pathrec->dgid.raw);
	else
		ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
			  status, path->pathrec.dgid.raw);

	skb_queue_head_init(&skqueue);

	if (!status) {
		struct rdma_ah_attr av;

		if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
			ah = ipoib_create_ah(dev, priv->pd, &av);
	}

	spin_lock_irqsave(&priv->lock, flags);

	if (!IS_ERR_OR_NULL(ah)) {
		path->pathrec = *pathrec;

		old_ah   = path->ah;
		path->ah = ah;

		ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
			  ah, be32_to_cpu(sa_path_get_dlid(pathrec)),
			  pathrec->sl);

		while ((skb = __skb_dequeue(&path->queue)))
			__skb_queue_tail(&skqueue, skb);

		list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
			if (neigh->ah) {
				WARN_ON(neigh->ah != old_ah);
				/*
				 * Dropping the ah reference inside
				 * priv->lock is safe here, because we
				 * will hold one more reference from
				 * the original value of path->ah (ie
				 * old_ah).
				 */
				ipoib_put_ah(neigh->ah);
			}
			kref_get(&path->ah->ref);
			neigh->ah = path->ah;

			if (ipoib_cm_enabled(dev, neigh->daddr)) {
				if (!ipoib_cm_get(neigh))
					ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
									       path,
									       neigh));
				if (!ipoib_cm_get(neigh)) {
					ipoib_neigh_free(neigh);
					continue;
				}
			}

			while ((skb = __skb_dequeue(&neigh->queue)))
				__skb_queue_tail(&skqueue, skb);
		}
		path->valid = 1;
	}

	path->query = NULL;
	complete(&path->done);

	spin_unlock_irqrestore(&priv->lock, flags);

	if (IS_ERR_OR_NULL(ah))
		ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);

	if (old_ah)
		ipoib_put_ah(old_ah);

	while ((skb = __skb_dequeue(&skqueue))) {
		int ret;
		skb->dev = dev;
		ret = dev_queue_xmit(skb);
		if (ret)
			ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n",
				   __func__, ret);
	}
}

static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct ipoib_path *path;

	if (!priv->broadcast)
		return NULL;

	path = kzalloc(sizeof *path, GFP_ATOMIC);
	if (!path)
		return NULL;

	path->dev = dev;

	skb_queue_head_init(&path->queue);

	INIT_LIST_HEAD(&path->neigh_list);

	if (rdma_cap_opa_ah(priv->ca, priv->port))
		path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA;
	else
		path->pathrec.rec_type = SA_PATH_REC_TYPE_IB;
	memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
	path->pathrec.sgid	    = priv->local_gid;
	path->pathrec.pkey	    = cpu_to_be16(priv->pkey);
	path->pathrec.numb_path     = 1;
	path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;

	return path;
}

static int path_rec_start(struct net_device *dev,
			  struct ipoib_path *path)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	ipoib_dbg(priv, "Start path record lookup for %pI6\n",
		  path->pathrec.dgid.raw);

	init_completion(&path->done);

	path->query_id =
		ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
				   &path->pathrec,
				   IB_SA_PATH_REC_DGID		|
				   IB_SA_PATH_REC_SGID		|
				   IB_SA_PATH_REC_NUMB_PATH	|
				   IB_SA_PATH_REC_TRAFFIC_CLASS |
				   IB_SA_PATH_REC_PKEY,
				   1000, GFP_ATOMIC,
				   path_rec_completion,
				   path, &path->query);
	if (path->query_id < 0) {
		ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
		path->query = NULL;
		complete(&path->done);
		return path->query_id;
	}

	return 0;
}

static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
			   struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct rdma_netdev *rn = netdev_priv(dev);
	struct ipoib_path *path;
	struct ipoib_neigh *neigh;
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	neigh = ipoib_neigh_alloc(daddr, dev);
	if (!neigh) {
		spin_unlock_irqrestore(&priv->lock, flags);
		++dev->stats.tx_dropped;
		dev_kfree_skb_any(skb);
		return;
	}

	path = __path_find(dev, daddr + 4);
	if (!path) {
		path = path_rec_create(dev, daddr + 4);
		if (!path)
			goto err_path;

		__path_add(dev, path);
	}

	list_add_tail(&neigh->list, &path->neigh_list);

	if (path->ah) {
		kref_get(&path->ah->ref);
		neigh->ah = path->ah;

		if (ipoib_cm_enabled(dev, neigh->daddr)) {
			if (!ipoib_cm_get(neigh))
				ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
			if (!ipoib_cm_get(neigh)) {
				ipoib_neigh_free(neigh);
				goto err_drop;
			}
			if (skb_queue_len(&neigh->queue) <
			    IPOIB_MAX_PATH_REC_QUEUE) {
				push_pseudo_header(skb, neigh->daddr);
				__skb_queue_tail(&neigh->queue, skb);
			} else {
				ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
					   skb_queue_len(&neigh->queue));
				goto err_drop;
			}
		} else {
			spin_unlock_irqrestore(&priv->lock, flags);
			path->ah->last_send = rn->send(dev, skb, path->ah->ah,
						       IPOIB_QPN(daddr));
			ipoib_neigh_put(neigh);
			return;
		}
	} else {
		neigh->ah  = NULL;

		if (!path->query && path_rec_start(dev, path))
			goto err_path;
		if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
			push_pseudo_header(skb, neigh->daddr);
			__skb_queue_tail(&neigh->queue, skb);
		} else {
			goto err_drop;
		}
	}

	spin_unlock_irqrestore(&priv->lock, flags);
	ipoib_neigh_put(neigh);
	return;

err_path:
	ipoib_neigh_free(neigh);
err_drop:
	++dev->stats.tx_dropped;
	dev_kfree_skb_any(skb);

	spin_unlock_irqrestore(&priv->lock, flags);
	ipoib_neigh_put(neigh);
}

static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
			     struct ipoib_pseudo_header *phdr)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct rdma_netdev *rn = netdev_priv(dev);
	struct ipoib_path *path;
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);

	path = __path_find(dev, phdr->hwaddr + 4);
	if (!path || !path->valid) {
		int new_path = 0;

		if (!path) {
			path = path_rec_create(dev, phdr->hwaddr + 4);
			new_path = 1;
		}
		if (path) {
			if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
				push_pseudo_header(skb, phdr->hwaddr);
				__skb_queue_tail(&path->queue, skb);
			} else {
				++dev->stats.tx_dropped;
				dev_kfree_skb_any(skb);
			}

			if (!path->query && path_rec_start(dev, path)) {
				spin_unlock_irqrestore(&priv->lock, flags);
				if (new_path)
					path_free(dev, path);
				return;
			} else
				__path_add(dev, path);
		} else {
			++dev->stats.tx_dropped;
			dev_kfree_skb_any(skb);
		}

		spin_unlock_irqrestore(&priv->lock, flags);
		return;
	}

	if (path->ah) {
		ipoib_dbg(priv, "Send unicast ARP to %08x\n",
			  be32_to_cpu(sa_path_get_dlid(&path->pathrec)));

		spin_unlock_irqrestore(&priv->lock, flags);
		path->ah->last_send = rn->send(dev, skb, path->ah->ah,
					       IPOIB_QPN(phdr->hwaddr));
		return;
	} else if ((path->query || !path_rec_start(dev, path)) &&
		   skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
		push_pseudo_header(skb, phdr->hwaddr);
		__skb_queue_tail(&path->queue, skb);
	} else {
		++dev->stats.tx_dropped;
		dev_kfree_skb_any(skb);
	}

	spin_unlock_irqrestore(&priv->lock, flags);
}

static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct rdma_netdev *rn = netdev_priv(dev);
	struct ipoib_neigh *neigh;
	struct ipoib_pseudo_header *phdr;
	struct ipoib_header *header;
	unsigned long flags;

	phdr = (struct ipoib_pseudo_header *) skb->data;
	skb_pull(skb, sizeof(*phdr));
	header = (struct ipoib_header *) skb->data;

	if (unlikely(phdr->hwaddr[4] == 0xff)) {
		/* multicast, arrange "if" according to probability */
		if ((header->proto != htons(ETH_P_IP)) &&
		    (header->proto != htons(ETH_P_IPV6)) &&
		    (header->proto != htons(ETH_P_ARP)) &&
		    (header->proto != htons(ETH_P_RARP)) &&
		    (header->proto != htons(ETH_P_TIPC))) {
			/* ethertype not supported by IPoIB */
			++dev->stats.tx_dropped;
			dev_kfree_skb_any(skb);
			return NETDEV_TX_OK;
		}
		/* Add in the P_Key for multicast*/
		phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
		phdr->hwaddr[9] = priv->pkey & 0xff;

		neigh = ipoib_neigh_get(dev, phdr->hwaddr);
		if (likely(neigh))
			goto send_using_neigh;
		ipoib_mcast_send(dev, phdr->hwaddr, skb);
		return NETDEV_TX_OK;
	}

	/* unicast, arrange "switch" according to probability */
	switch (header->proto) {
	case htons(ETH_P_IP):
	case htons(ETH_P_IPV6):
	case htons(ETH_P_TIPC):
		neigh = ipoib_neigh_get(dev, phdr->hwaddr);
		if (unlikely(!neigh)) {
			neigh_add_path(skb, phdr->hwaddr, dev);
			return NETDEV_TX_OK;
		}
		break;
	case htons(ETH_P_ARP):
	case htons(ETH_P_RARP):
		/* for unicast ARP and RARP should always perform path find */
		unicast_arp_send(skb, dev, phdr);
		return NETDEV_TX_OK;
	default:
		/* ethertype not supported by IPoIB */
		++dev->stats.tx_dropped;
		dev_kfree_skb_any(skb);
		return NETDEV_TX_OK;
	}

send_using_neigh:
	/* note we now hold a ref to neigh */
	if (ipoib_cm_get(neigh)) {
		if (ipoib_cm_up(neigh)) {
			ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
			goto unref;
		}
	} else if (neigh->ah) {
		neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah,
						IPOIB_QPN(phdr->hwaddr));
		goto unref;
	}

	if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
		push_pseudo_header(skb, phdr->hwaddr);
		spin_lock_irqsave(&priv->lock, flags);
		__skb_queue_tail(&neigh->queue, skb);
		spin_unlock_irqrestore(&priv->lock, flags);
	} else {
		++dev->stats.tx_dropped;
		dev_kfree_skb_any(skb);
	}

unref:
	ipoib_neigh_put(neigh);

	return NETDEV_TX_OK;
}

static void ipoib_timeout(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
		   jiffies_to_msecs(jiffies - dev_trans_start(dev)));
	ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
		   netif_queue_stopped(dev),
		   priv->tx_head, priv->tx_tail);
	/* XXX reset QP, etc. */
}

static int ipoib_hard_header(struct sk_buff *skb,
			     struct net_device *dev,
			     unsigned short type,
			     const void *daddr, const void *saddr, unsigned len)
{
	struct ipoib_header *header;

	header = skb_push(skb, sizeof *header);

	header->proto = htons(type);
	header->reserved = 0;

	/*
	 * we don't rely on dst_entry structure,  always stuff the
	 * destination address into skb hard header so we can figure out where
	 * to send the packet later.
	 */
	push_pseudo_header(skb, daddr);

	return IPOIB_HARD_LEN;
}

static void ipoib_set_mcast_list(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
		ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
		return;
	}

	queue_work(priv->wq, &priv->restart_task);
}

static int ipoib_get_iflink(const struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	/* parent interface */
	if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
		return dev->ifindex;

	/* child/vlan interface */
	return priv->parent->ifindex;
}

static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
{
	/*
	 * Use only the address parts that contributes to spreading
	 * The subnet prefix is not used as one can not connect to
	 * same remote port (GUID) using the same remote QPN via two
	 * different subnets.
	 */
	 /* qpn octets[1:4) & port GUID octets[12:20) */
	u32 *d32 = (u32 *) daddr;
	u32 hv;

	hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
	return hv & htbl->mask;
}

struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct ipoib_neigh_table *ntbl = &priv->ntbl;
	struct ipoib_neigh_hash *htbl;
	struct ipoib_neigh *neigh = NULL;
	u32 hash_val;

	rcu_read_lock_bh();

	htbl = rcu_dereference_bh(ntbl->htbl);

	if (!htbl)
		goto out_unlock;

	hash_val = ipoib_addr_hash(htbl, daddr);
	for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
	     neigh != NULL;
	     neigh = rcu_dereference_bh(neigh->hnext)) {
		if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
			/* found, take one ref on behalf of the caller */
			if (!atomic_inc_not_zero(&neigh->refcnt)) {
				/* deleted */
				neigh = NULL;
				goto out_unlock;
			}

			if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
				neigh->alive = jiffies;
			goto out_unlock;
		}
	}

out_unlock:
	rcu_read_unlock_bh();
	return neigh;
}

static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
{
	struct ipoib_neigh_table *ntbl = &priv->ntbl;
	struct ipoib_neigh_hash *htbl;
	unsigned long neigh_obsolete;
	unsigned long dt;
	unsigned long flags;
	int i;
	LIST_HEAD(remove_list);

	if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
		return;

	spin_lock_irqsave(&priv->lock, flags);

	htbl = rcu_dereference_protected(ntbl->htbl,
					 lockdep_is_held(&priv->lock));

	if (!htbl)
		goto out_unlock;

	/* neigh is obsolete if it was idle for two GC periods */
	dt = 2 * arp_tbl.gc_interval;
	neigh_obsolete = jiffies - dt;
	/* handle possible race condition */
	if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
		goto out_unlock;

	for (i = 0; i < htbl->size; i++) {
		struct ipoib_neigh *neigh;
		struct ipoib_neigh __rcu **np = &htbl->buckets[i];

		while ((neigh = rcu_dereference_protected(*np,
							  lockdep_is_held(&priv->lock))) != NULL) {
			/* was the neigh idle for two GC periods */
			if (time_after(neigh_obsolete, neigh->alive)) {

				ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);

				rcu_assign_pointer(*np,
						   rcu_dereference_protected(neigh->hnext,
									     lockdep_is_held(&priv->lock)));
				/* remove from path/mc list */
				list_del_init(&neigh->list);
				call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
			} else {
				np = &neigh->hnext;
			}

		}
	}

out_unlock:
	spin_unlock_irqrestore(&priv->lock, flags);
	ipoib_mcast_remove_list(&remove_list);
}

static void ipoib_reap_neigh(struct work_struct *work)
{
	struct ipoib_dev_priv *priv =
		container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);

	__ipoib_reap_neigh(priv);

	if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
		queue_delayed_work(priv->wq, &priv->neigh_reap_task,
				   arp_tbl.gc_interval);
}


static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
				      struct net_device *dev)
{
	struct ipoib_neigh *neigh;

	neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
	if (!neigh)
		return NULL;

	neigh->dev = dev;
	memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
	skb_queue_head_init(&neigh->queue);
	INIT_LIST_HEAD(&neigh->list);
	ipoib_cm_set(neigh, NULL);
	/* one ref on behalf of the caller */
	atomic_set(&neigh->refcnt, 1);

	return neigh;
}

struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
				      struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct ipoib_neigh_table *ntbl = &priv->ntbl;
	struct ipoib_neigh_hash *htbl;
	struct ipoib_neigh *neigh;
	u32 hash_val;

	htbl = rcu_dereference_protected(ntbl->htbl,
					 lockdep_is_held(&priv->lock));
	if (!htbl) {
		neigh = NULL;
		goto out_unlock;
	}

	/* need to add a new neigh, but maybe some other thread succeeded?
	 * recalc hash, maybe hash resize took place so we do a search
	 */
	hash_val = ipoib_addr_hash(htbl, daddr);
	for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
					       lockdep_is_held(&priv->lock));
	     neigh != NULL;
	     neigh = rcu_dereference_protected(neigh->hnext,
					       lockdep_is_held(&priv->lock))) {
		if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
			/* found, take one ref on behalf of the caller */
			if (!atomic_inc_not_zero(&neigh->refcnt)) {
				/* deleted */
				neigh = NULL;
				break;
			}
			neigh->alive = jiffies;
			goto out_unlock;
		}
	}

	neigh = ipoib_neigh_ctor(daddr, dev);
	if (!neigh)
		goto out_unlock;

	/* one ref on behalf of the hash table */
	atomic_inc(&neigh->refcnt);
	neigh->alive = jiffies;
	/* put in hash */
	rcu_assign_pointer(neigh->hnext,
			   rcu_dereference_protected(htbl->buckets[hash_val],
						     lockdep_is_held(&priv->lock)));
	rcu_assign_pointer(htbl->buckets[hash_val], neigh);
	atomic_inc(&ntbl->entries);

out_unlock:

	return neigh;
}

void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
{
	/* neigh reference count was dropprd to zero */
	struct net_device *dev = neigh->dev;
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct sk_buff *skb;
	if (neigh->ah)
		ipoib_put_ah(neigh->ah);
	while ((skb = __skb_dequeue(&neigh->queue))) {
		++dev->stats.tx_dropped;
		dev_kfree_skb_any(skb);
	}
	if (ipoib_cm_get(neigh))
		ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
	ipoib_dbg(ipoib_priv(dev),
		  "neigh free for %06x %pI6\n",
		  IPOIB_QPN(neigh->daddr),
		  neigh->daddr + 4);
	kfree(neigh);
	if (atomic_dec_and_test(&priv->ntbl.entries)) {
		if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
			complete(&priv->ntbl.flushed);
	}
}

static void ipoib_neigh_reclaim(struct rcu_head *rp)
{
	/* Called as a result of removal from hash table */
	struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
	/* note TX context may hold another ref */
	ipoib_neigh_put(neigh);
}

void ipoib_neigh_free(struct ipoib_neigh *neigh)
{
	struct net_device *dev = neigh->dev;
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct ipoib_neigh_table *ntbl = &priv->ntbl;
	struct ipoib_neigh_hash *htbl;
	struct ipoib_neigh __rcu **np;
	struct ipoib_neigh *n;
	u32 hash_val;

	htbl = rcu_dereference_protected(ntbl->htbl,
					lockdep_is_held(&priv->lock));
	if (!htbl)
		return;

	hash_val = ipoib_addr_hash(htbl, neigh->daddr);
	np = &htbl->buckets[hash_val];
	for (n = rcu_dereference_protected(*np,
					    lockdep_is_held(&priv->lock));
	     n != NULL;
	     n = rcu_dereference_protected(*np,
					lockdep_is_held(&priv->lock))) {
		if (n == neigh) {
			/* found */
			rcu_assign_pointer(*np,
					   rcu_dereference_protected(neigh->hnext,
								     lockdep_is_held(&priv->lock)));
			/* remove from parent list */
			list_del_init(&neigh->list);
			call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
			return;
		} else {
			np = &n->hnext;
		}
	}
}

static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
{
	struct ipoib_neigh_table *ntbl = &priv->ntbl;
	struct ipoib_neigh_hash *htbl;
	struct ipoib_neigh __rcu **buckets;
	u32 size;

	clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
	ntbl->htbl = NULL;
	htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
	if (!htbl)
		return -ENOMEM;
	set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
	size = roundup_pow_of_two(arp_tbl.gc_thresh3);
	buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
	if (!buckets) {
		kfree(htbl);
		return -ENOMEM;
	}
	htbl->size = size;
	htbl->mask = (size - 1);
	htbl->buckets = buckets;
	RCU_INIT_POINTER(ntbl->htbl, htbl);
	htbl->ntbl = ntbl;
	atomic_set(&ntbl->entries, 0);

	/* start garbage collection */
	clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
	queue_delayed_work(priv->wq, &priv->neigh_reap_task,
			   arp_tbl.gc_interval);

	return 0;
}

static void neigh_hash_free_rcu(struct rcu_head *head)
{
	struct ipoib_neigh_hash *htbl = container_of(head,
						    struct ipoib_neigh_hash,
						    rcu);
	struct ipoib_neigh __rcu **buckets = htbl->buckets;
	struct ipoib_neigh_table *ntbl = htbl->ntbl;

	kfree(buckets);
	kfree(htbl);
	complete(&ntbl->deleted);
}

void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct ipoib_neigh_table *ntbl = &priv->ntbl;
	struct ipoib_neigh_hash *htbl;
	unsigned long flags;
	int i;

	/* remove all neigh connected to a given path or mcast */
	spin_lock_irqsave(&priv->lock, flags);

	htbl = rcu_dereference_protected(ntbl->htbl,
					 lockdep_is_held(&priv->lock));

	if (!htbl)
		goto out_unlock;

	for (i = 0; i < htbl->size; i++) {
		struct ipoib_neigh *neigh;
		struct ipoib_neigh __rcu **np = &htbl->buckets[i];

		while ((neigh = rcu_dereference_protected(*np,
							  lockdep_is_held(&priv->lock))) != NULL) {
			/* delete neighs belong to this parent */
			if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
				rcu_assign_pointer(*np,
						   rcu_dereference_protected(neigh->hnext,
									     lockdep_is_held(&priv->lock)));
				/* remove from parent list */
				list_del_init(&neigh->list);
				call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
			} else {
				np = &neigh->hnext;
			}

		}
	}
out_unlock:
	spin_unlock_irqrestore(&priv->lock, flags);
}

static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
{
	struct ipoib_neigh_table *ntbl = &priv->ntbl;
	struct ipoib_neigh_hash *htbl;
	unsigned long flags;
	int i, wait_flushed = 0;

	init_completion(&priv->ntbl.flushed);
	set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);

	spin_lock_irqsave(&priv->lock, flags);

	htbl = rcu_dereference_protected(ntbl->htbl,
					lockdep_is_held(&priv->lock));
	if (!htbl)
		goto out_unlock;

	wait_flushed = atomic_read(&priv->ntbl.entries);
	if (!wait_flushed)
		goto free_htbl;

	for (i = 0; i < htbl->size; i++) {
		struct ipoib_neigh *neigh;
		struct ipoib_neigh __rcu **np = &htbl->buckets[i];

		while ((neigh = rcu_dereference_protected(*np,
				       lockdep_is_held(&priv->lock))) != NULL) {
			rcu_assign_pointer(*np,
					   rcu_dereference_protected(neigh->hnext,
								     lockdep_is_held(&priv->lock)));
			/* remove from path/mc list */
			list_del_init(&neigh->list);
			call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
		}
	}

free_htbl:
	rcu_assign_pointer(ntbl->htbl, NULL);
	call_rcu(&htbl->rcu, neigh_hash_free_rcu);

out_unlock:
	spin_unlock_irqrestore(&priv->lock, flags);
	if (wait_flushed)
		wait_for_completion(&priv->ntbl.flushed);
}

static void ipoib_neigh_hash_uninit(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	int stopped;

	ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
	init_completion(&priv->ntbl.deleted);

	/* Stop GC if called at init fail need to cancel work */
	stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
	if (!stopped)
		cancel_delayed_work(&priv->neigh_reap_task);

	ipoib_flush_neighs(priv);

	wait_for_completion(&priv->ntbl.deleted);
}

static void ipoib_dev_uninit_default(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	ipoib_transport_dev_cleanup(dev);

	netif_napi_del(&priv->napi);

	ipoib_cm_dev_cleanup(dev);

	kfree(priv->rx_ring);
	vfree(priv->tx_ring);

	priv->rx_ring = NULL;
	priv->tx_ring = NULL;
}

static int ipoib_dev_init_default(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT);

	/* Allocate RX/TX "rings" to hold queued skbs */
	priv->rx_ring =	kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
				GFP_KERNEL);
	if (!priv->rx_ring)
		goto out;

	priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
	if (!priv->tx_ring) {
		printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
		       priv->ca->name, ipoib_sendq_size);
		goto out_rx_ring_cleanup;
	}

	/* priv->tx_head, tx_tail & tx_outstanding are already 0 */

	if (ipoib_transport_dev_init(dev, priv->ca)) {
		pr_warn("%s: ipoib_transport_dev_init failed\n",
			priv->ca->name);
		goto out_tx_ring_cleanup;
	}

	/* after qp created set dev address */
	priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff;
	priv->dev->dev_addr[2] = (priv->qp->qp_num >>  8) & 0xff;
	priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff;

	setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
		    (unsigned long)dev);

	return 0;

out_tx_ring_cleanup:
	vfree(priv->tx_ring);

out_rx_ring_cleanup:
	kfree(priv->rx_ring);

out:
	netif_napi_del(&priv->napi);
	return -ENOMEM;
}

int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	int ret = -ENOMEM;

	priv->ca = ca;
	priv->port = port;
	priv->qp = NULL;

	/*
	 * the various IPoIB tasks assume they will never race against
	 * themselves, so always use a single thread workqueue
	 */
	priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM);
	if (!priv->wq) {
		pr_warn("%s: failed to allocate device WQ\n", dev->name);
		goto out;
	}

	/* create pd, which used both for control and datapath*/
	priv->pd = ib_alloc_pd(priv->ca, 0);
	if (IS_ERR(priv->pd)) {
		pr_warn("%s: failed to allocate PD\n", ca->name);
		goto clean_wq;
	}

	ret = priv->rn_ops->ndo_init(dev);
	if (ret) {
		pr_warn("%s failed to init HW resource\n", dev->name);
		goto out_free_pd;
	}

	if (ipoib_neigh_hash_init(priv) < 0) {
		pr_warn("%s failed to init neigh hash\n", dev->name);
		goto out_dev_uninit;
	}

	if (dev->flags & IFF_UP) {
		if (ipoib_ib_dev_open(dev)) {
			pr_warn("%s failed to open device\n", dev->name);
			ret = -ENODEV;
			goto out_dev_uninit;
		}
	}

	return 0;

out_dev_uninit:
	ipoib_ib_dev_cleanup(dev);

out_free_pd:
	if (priv->pd) {
		ib_dealloc_pd(priv->pd);
		priv->pd = NULL;
	}

clean_wq:
	if (priv->wq) {
		destroy_workqueue(priv->wq);
		priv->wq = NULL;
	}

out:
	return ret;
}

void ipoib_dev_cleanup(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev), *cpriv, *tcpriv;
	LIST_HEAD(head);

	ASSERT_RTNL();

	/* Delete any child interfaces first */
	list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
		/* Stop GC on child */
		set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
		cancel_delayed_work(&cpriv->neigh_reap_task);
		unregister_netdevice_queue(cpriv->dev, &head);
	}
	unregister_netdevice_many(&head);

	ipoib_neigh_hash_uninit(dev);

	ipoib_ib_dev_cleanup(dev);

	/* no more works over the priv->wq */
	if (priv->wq) {
		flush_workqueue(priv->wq);
		destroy_workqueue(priv->wq);
		priv->wq = NULL;
	}
}

static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
}

static int ipoib_get_vf_config(struct net_device *dev, int vf,
			       struct ifla_vf_info *ivf)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	int err;

	err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
	if (err)
		return err;

	ivf->vf = vf;

	return 0;
}

static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
		return -EINVAL;

	return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
}

static int ipoib_get_vf_stats(struct net_device *dev, int vf,
			      struct ifla_vf_stats *vf_stats)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
}

static const struct header_ops ipoib_header_ops = {
	.create	= ipoib_hard_header,
};

static const struct net_device_ops ipoib_netdev_ops_pf = {
	.ndo_uninit		 = ipoib_uninit,
	.ndo_open		 = ipoib_open,
	.ndo_stop		 = ipoib_stop,
	.ndo_change_mtu		 = ipoib_change_mtu,
	.ndo_fix_features	 = ipoib_fix_features,
	.ndo_start_xmit		 = ipoib_start_xmit,
	.ndo_tx_timeout		 = ipoib_timeout,
	.ndo_set_rx_mode	 = ipoib_set_mcast_list,
	.ndo_get_iflink		 = ipoib_get_iflink,
	.ndo_set_vf_link_state	 = ipoib_set_vf_link_state,
	.ndo_get_vf_config	 = ipoib_get_vf_config,
	.ndo_get_vf_stats	 = ipoib_get_vf_stats,
	.ndo_set_vf_guid	 = ipoib_set_vf_guid,
	.ndo_set_mac_address	 = ipoib_set_mac,
	.ndo_get_stats64	 = ipoib_get_stats,
};

static const struct net_device_ops ipoib_netdev_ops_vf = {
	.ndo_uninit		 = ipoib_uninit,
	.ndo_open		 = ipoib_open,
	.ndo_stop		 = ipoib_stop,
	.ndo_change_mtu		 = ipoib_change_mtu,
	.ndo_fix_features	 = ipoib_fix_features,
	.ndo_start_xmit	 	 = ipoib_start_xmit,
	.ndo_tx_timeout		 = ipoib_timeout,
	.ndo_set_rx_mode	 = ipoib_set_mcast_list,
	.ndo_get_iflink		 = ipoib_get_iflink,
	.ndo_get_stats64	 = ipoib_get_stats,
};

void ipoib_setup_common(struct net_device *dev)
{
	dev->header_ops		 = &ipoib_header_ops;

	ipoib_set_ethtool_ops(dev);

	dev->watchdog_timeo	 = HZ;

	dev->flags		|= IFF_BROADCAST | IFF_MULTICAST;

	dev->hard_header_len	 = IPOIB_HARD_LEN;
	dev->addr_len		 = INFINIBAND_ALEN;
	dev->type		 = ARPHRD_INFINIBAND;
	dev->tx_queue_len	 = ipoib_sendq_size * 2;
	dev->features		 = (NETIF_F_VLAN_CHALLENGED	|
				    NETIF_F_HIGHDMA);
	netif_keep_dst(dev);

	memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
}

static void ipoib_build_priv(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);

	priv->dev = dev;
	spin_lock_init(&priv->lock);
	init_rwsem(&priv->vlan_rwsem);
	mutex_init(&priv->mcast_mutex);

	INIT_LIST_HEAD(&priv->path_list);
	INIT_LIST_HEAD(&priv->child_intfs);
	INIT_LIST_HEAD(&priv->dead_ahs);
	INIT_LIST_HEAD(&priv->multicast_list);

	INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
	INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
	INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
	INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
	INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
	INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
	INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
	INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
}

static const struct net_device_ops ipoib_netdev_default_pf = {
	.ndo_init		 = ipoib_dev_init_default,
	.ndo_uninit		 = ipoib_dev_uninit_default,
	.ndo_open		 = ipoib_ib_dev_open_default,
	.ndo_stop		 = ipoib_ib_dev_stop_default,
};

static struct net_device
*ipoib_create_netdev_default(struct ib_device *hca,
			     const char *name,
			     unsigned char name_assign_type,
			     void (*setup)(struct net_device *))
{
	struct net_device *dev;
	struct rdma_netdev *rn;

	dev = alloc_netdev((int)sizeof(struct rdma_netdev),
			   name,
			   name_assign_type, setup);
	if (!dev)
		return NULL;

	rn = netdev_priv(dev);

	rn->send = ipoib_send;
	rn->attach_mcast = ipoib_mcast_attach;
	rn->detach_mcast = ipoib_mcast_detach;
	rn->free_rdma_netdev = free_netdev;
	rn->hca = hca;

	dev->netdev_ops = &ipoib_netdev_default_pf;

	return dev;
}

static struct net_device *ipoib_get_netdev(struct ib_device *hca, u8 port,
					   const char *name)
{
	struct net_device *dev;

	if (hca->alloc_rdma_netdev) {
		dev = hca->alloc_rdma_netdev(hca, port,
					     RDMA_NETDEV_IPOIB, name,
					     NET_NAME_UNKNOWN,
					     ipoib_setup_common);
		if (IS_ERR_OR_NULL(dev) && PTR_ERR(dev) != -EOPNOTSUPP)
			return NULL;
	}

	if (!hca->alloc_rdma_netdev || PTR_ERR(dev) == -EOPNOTSUPP)
		dev = ipoib_create_netdev_default(hca, name, NET_NAME_UNKNOWN,
						  ipoib_setup_common);

	return dev;
}

struct ipoib_dev_priv *ipoib_intf_alloc(struct ib_device *hca, u8 port,
					const char *name)
{
	struct net_device *dev;
	struct ipoib_dev_priv *priv;
	struct rdma_netdev *rn;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return NULL;

	dev = ipoib_get_netdev(hca, port, name);
	if (!dev)
		goto free_priv;

	priv->rn_ops = dev->netdev_ops;

	/* fixme : should be after the query_cap */
	if (priv->hca_caps & IB_DEVICE_VIRTUAL_FUNCTION)
		dev->netdev_ops	= &ipoib_netdev_ops_vf;
	else
		dev->netdev_ops	= &ipoib_netdev_ops_pf;

	rn = netdev_priv(dev);
	rn->clnt_priv = priv;
	ipoib_build_priv(dev);

	return priv;
free_priv:
	kfree(priv);
	return NULL;
}

static ssize_t show_pkey(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	struct net_device *ndev = to_net_dev(dev);
	struct ipoib_dev_priv *priv = ipoib_priv(ndev);

	return sprintf(buf, "0x%04x\n", priv->pkey);
}
static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);

static ssize_t show_umcast(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct net_device *ndev = to_net_dev(dev);
	struct ipoib_dev_priv *priv = ipoib_priv(ndev);

	return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
}

void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
{
	struct ipoib_dev_priv *priv = ipoib_priv(ndev);

	if (umcast_val > 0) {
		set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
		ipoib_warn(priv, "ignoring multicast groups joined directly "
				"by userspace\n");
	} else
		clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
}

static ssize_t set_umcast(struct device *dev,
			  struct device_attribute *attr,
			  const char *buf, size_t count)
{
	unsigned long umcast_val = simple_strtoul(buf, NULL, 0);

	ipoib_set_umcast(to_net_dev(dev), umcast_val);

	return count;
}
static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);

int ipoib_add_umcast_attr(struct net_device *dev)
{
	return device_create_file(&dev->dev, &dev_attr_umcast);
}

static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
{
	struct ipoib_dev_priv *child_priv;
	struct net_device *netdev = priv->dev;

	netif_addr_lock_bh(netdev);

	memcpy(&priv->local_gid.global.interface_id,
	       &gid->global.interface_id,
	       sizeof(gid->global.interface_id));
	memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
	clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);

	netif_addr_unlock_bh(netdev);

	if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
		down_read(&priv->vlan_rwsem);
		list_for_each_entry(child_priv, &priv->child_intfs, list)
			set_base_guid(child_priv, gid);
		up_read(&priv->vlan_rwsem);
	}
}

static int ipoib_check_lladdr(struct net_device *dev,
			      struct sockaddr_storage *ss)
{
	union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
	int ret = 0;

	netif_addr_lock_bh(dev);

	/* Make sure the QPN, reserved and subnet prefix match the current
	 * lladdr, it also makes sure the lladdr is unicast.
	 */
	if (memcmp(dev->dev_addr, ss->__data,
		   4 + sizeof(gid->global.subnet_prefix)) ||
	    gid->global.interface_id == 0)
		ret = -EINVAL;

	netif_addr_unlock_bh(dev);

	return ret;
}

static int ipoib_set_mac(struct net_device *dev, void *addr)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct sockaddr_storage *ss = addr;
	int ret;

	if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
		return -EBUSY;

	ret = ipoib_check_lladdr(dev, ss);
	if (ret)
		return ret;

	set_base_guid(priv, (union ib_gid *)(ss->__data + 4));

	queue_work(ipoib_workqueue, &priv->flush_light);

	return 0;
}

static ssize_t create_child(struct device *dev,
			    struct device_attribute *attr,
			    const char *buf, size_t count)
{
	int pkey;
	int ret;

	if (sscanf(buf, "%i", &pkey) != 1)
		return -EINVAL;

	if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
		return -EINVAL;

	/*
	 * Set the full membership bit, so that we join the right
	 * broadcast group, etc.
	 */
	pkey |= 0x8000;

	ret = ipoib_vlan_add(to_net_dev(dev), pkey);

	return ret ? ret : count;
}
static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);

static ssize_t delete_child(struct device *dev,
			    struct device_attribute *attr,
			    const char *buf, size_t count)
{
	int pkey;
	int ret;

	if (sscanf(buf, "%i", &pkey) != 1)
		return -EINVAL;

	if (pkey < 0 || pkey > 0xffff)
		return -EINVAL;

	ret = ipoib_vlan_delete(to_net_dev(dev), pkey);

	return ret ? ret : count;

}
static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);

int ipoib_add_pkey_attr(struct net_device *dev)
{
	return device_create_file(&dev->dev, &dev_attr_pkey);
}

void ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
{
	priv->hca_caps = hca->attrs.device_cap_flags;

	if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
		priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;

		if (priv->hca_caps & IB_DEVICE_UD_TSO)
			priv->dev->hw_features |= NETIF_F_TSO;

		priv->dev->features |= priv->dev->hw_features;
	}
}

static struct net_device *ipoib_add_port(const char *format,
					 struct ib_device *hca, u8 port)
{
	struct ipoib_dev_priv *priv;
	struct ib_port_attr attr;
	int result = -ENOMEM;

	priv = ipoib_intf_alloc(hca, port, format);
	if (!priv)
		goto alloc_mem_failed;

	SET_NETDEV_DEV(priv->dev, hca->dev.parent);
	priv->dev->dev_id = port - 1;

	result = ib_query_port(hca, port, &attr);
	if (result) {
		printk(KERN_WARNING "%s: ib_query_port %d failed\n",
		       hca->name, port);
		goto device_init_failed;
	}

	priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);

	/* MTU will be reset when mcast join happens */
	priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
	priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
	priv->dev->max_mtu = IPOIB_CM_MTU;

	priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);

	result = ib_query_pkey(hca, port, 0, &priv->pkey);
	if (result) {
		printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
		       hca->name, port, result);
		goto device_init_failed;
	}

	ipoib_set_dev_features(priv, hca);

	/*
	 * Set the full membership bit, so that we join the right
	 * broadcast group, etc.
	 */
	priv->pkey |= 0x8000;

	priv->dev->broadcast[8] = priv->pkey >> 8;
	priv->dev->broadcast[9] = priv->pkey & 0xff;

	result = ib_query_gid(hca, port, 0, &priv->local_gid, NULL);
	if (result) {
		printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
		       hca->name, port, result);
		goto device_init_failed;
	}

	memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw,
	       sizeof(union ib_gid));
	set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);

	result = ipoib_dev_init(priv->dev, hca, port);
	if (result) {
		printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
		       hca->name, port, result);
		goto device_init_failed;
	}

	INIT_IB_EVENT_HANDLER(&priv->event_handler,
			      priv->ca, ipoib_event);
	result = ib_register_event_handler(&priv->event_handler);
	if (result < 0) {
		printk(KERN_WARNING "%s: ib_register_event_handler failed for "
		       "port %d (ret = %d)\n",
		       hca->name, port, result);
		goto event_failed;
	}

	result = register_netdev(priv->dev);
	if (result) {
		printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
		       hca->name, port, result);
		goto register_failed;
	}

	result = -ENOMEM;
	if (ipoib_cm_add_mode_attr(priv->dev))
		goto sysfs_failed;
	if (ipoib_add_pkey_attr(priv->dev))
		goto sysfs_failed;
	if (ipoib_add_umcast_attr(priv->dev))
		goto sysfs_failed;
	if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
		goto sysfs_failed;
	if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
		goto sysfs_failed;

	return priv->dev;

sysfs_failed:
	unregister_netdev(priv->dev);

register_failed:
	ib_unregister_event_handler(&priv->event_handler);
	flush_workqueue(ipoib_workqueue);
	/* Stop GC if started before flush */
	set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
	cancel_delayed_work(&priv->neigh_reap_task);
	flush_workqueue(priv->wq);

event_failed:
	ipoib_dev_cleanup(priv->dev);

device_init_failed:
	free_netdev(priv->dev);
	kfree(priv);

alloc_mem_failed:
	return ERR_PTR(result);
}

static void ipoib_add_one(struct ib_device *device)
{
	struct list_head *dev_list;
	struct net_device *dev;
	struct ipoib_dev_priv *priv;
	int p;
	int count = 0;

	dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
	if (!dev_list)
		return;

	INIT_LIST_HEAD(dev_list);

	for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
		if (!rdma_protocol_ib(device, p))
			continue;
		dev = ipoib_add_port("ib%d", device, p);
		if (!IS_ERR(dev)) {
			priv = ipoib_priv(dev);
			list_add_tail(&priv->list, dev_list);
			count++;
		}
	}

	if (!count) {
		kfree(dev_list);
		return;
	}

	ib_set_client_data(device, &ipoib_client, dev_list);
}

static void ipoib_remove_one(struct ib_device *device, void *client_data)
{
	struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv;
	struct list_head *dev_list = client_data;

	if (!dev_list)
		return;

	list_for_each_entry_safe(priv, tmp, dev_list, list) {
		struct rdma_netdev *rn = netdev_priv(priv->dev);

		ib_unregister_event_handler(&priv->event_handler);
		flush_workqueue(ipoib_workqueue);

		/* mark interface in the middle of destruction */
		set_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags);

		rtnl_lock();
		dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
		rtnl_unlock();

		/* Stop GC */
		set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
		cancel_delayed_work(&priv->neigh_reap_task);
		flush_workqueue(priv->wq);

		unregister_netdev(priv->dev);
		rn->free_rdma_netdev(priv->dev);

		list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list)
			kfree(cpriv);

		kfree(priv);
	}

	kfree(dev_list);
}

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
static struct notifier_block ipoib_netdev_notifier = {
	.notifier_call = ipoib_netdev_event,
};
#endif

static int __init ipoib_init_module(void)
{
	int ret;

	ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
	ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
	ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);

	ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
	ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
	ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
#ifdef CONFIG_INFINIBAND_IPOIB_CM
	ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
	ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0);
#endif

	/*
	 * When copying small received packets, we only copy from the
	 * linear data part of the SKB, so we rely on this condition.
	 */
	BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);

	ret = ipoib_register_debugfs();
	if (ret)
		return ret;

	/*
	 * We create a global workqueue here that is used for all flush
	 * operations.  However, if you attempt to flush a workqueue
	 * from a task on that same workqueue, it deadlocks the system.
	 * We want to be able to flush the tasks associated with a
	 * specific net device, so we also create a workqueue for each
	 * netdevice.  We queue up the tasks for that device only on
	 * its private workqueue, and we only queue up flush events
	 * on our global flush workqueue.  This avoids the deadlocks.
	 */
	ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush",
						  WQ_MEM_RECLAIM);
	if (!ipoib_workqueue) {
		ret = -ENOMEM;
		goto err_fs;
	}

	ib_sa_register_client(&ipoib_sa_client);

	ret = ib_register_client(&ipoib_client);
	if (ret)
		goto err_sa;

	ret = ipoib_netlink_init();
	if (ret)
		goto err_client;

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
	register_netdevice_notifier(&ipoib_netdev_notifier);
#endif
	return 0;

err_client:
	ib_unregister_client(&ipoib_client);

err_sa:
	ib_sa_unregister_client(&ipoib_sa_client);
	destroy_workqueue(ipoib_workqueue);

err_fs:
	ipoib_unregister_debugfs();

	return ret;
}

static void __exit ipoib_cleanup_module(void)
{
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
	unregister_netdevice_notifier(&ipoib_netdev_notifier);
#endif
	ipoib_netlink_fini();
	ib_unregister_client(&ipoib_client);
	ib_sa_unregister_client(&ipoib_sa_client);
	ipoib_unregister_debugfs();
	destroy_workqueue(ipoib_workqueue);
}

module_init(ipoib_init_module);
module_exit(ipoib_cleanup_module);

Privacy Policy