summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/ulp/ipoib/ipoib_main.c
blob: b4c380c5a3ba97c99dfa7465af7f85f5e23b2bde (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
/*
 * 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.
 *
 * $Id: ipoib_main.c 1377 2004-12-23 19:57:12Z roland $
 */

#include "ipoib.h"

#include <linux/module.h>

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

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

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

#include <net/dst.h>

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);

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

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

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

	set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);

	if (ipoib_pkey_dev_delay_open(dev))
		return 0;

	if (ipoib_ib_dev_open(dev))
		return -EINVAL;

	if (ipoib_ib_dev_up(dev)) {
		ipoib_ib_dev_stop(dev);
		return -EINVAL;
	}

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

		/* Bring up any child interfaces too */
		mutex_lock(&priv->vlan_mutex);
		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);
		}
		mutex_unlock(&priv->vlan_mutex);
	}

	netif_start_queue(dev);

	return 0;
}

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

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

	clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);

	netif_stop_queue(dev);

	clear_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags);

	/*
	 * Now flush workqueue to make sure a scheduled task doesn't
	 * bring our internal state back up.
	 */
	flush_workqueue(ipoib_workqueue);

	ipoib_ib_dev_down(dev, 1);
	ipoib_ib_dev_stop(dev);

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

		/* Bring down any child interfaces too */
		mutex_lock(&priv->vlan_mutex);
		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);
		}
		mutex_unlock(&priv->vlan_mutex);
	}

	return 0;
}

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

	/* dev->mtu > 2K ==> connected mode */
	if (ipoib_cm_admin_enabled(dev) && new_mtu <= IPOIB_CM_MTU) {
		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_PACKET_SIZE - IPOIB_ENCAP_LEN) {
		return -EINVAL;
	}

	priv->admin_mtu = new_mtu;

	dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);

	return 0;
}

static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
{
	struct ipoib_dev_priv *priv = netdev_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 = netdev_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 ipoib_dev_priv *priv = netdev_priv(dev);
	struct ipoib_neigh *neigh, *tn;
	struct sk_buff *skb;
	unsigned long flags;

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

	spin_lock_irqsave(&priv->lock, flags);

	list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
		/*
		 * It's safe to call ipoib_put_ah() inside priv->lock
		 * here, because we know that path->ah will always
		 * hold one more reference, so ipoib_put_ah() will
		 * never do more than decrement the ref count.
		 */
		if (neigh->ah)
			ipoib_put_ah(neigh->ah);

		ipoib_neigh_free(dev, neigh);
	}

	spin_unlock_irqrestore(&priv->lock, flags);

	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 = netdev_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_flush_paths(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	struct ipoib_path *path, *tp;
	LIST_HEAD(remove_list);

	spin_lock_irq(&priv->tx_lock);
	spin_lock(&priv->lock);

	list_splice(&priv->path_list, &remove_list);
	INIT_LIST_HEAD(&priv->path_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(&priv->lock);
		spin_unlock_irq(&priv->tx_lock);
		wait_for_completion(&path->done);
		path_free(dev, path);
		spin_lock_irq(&priv->tx_lock);
		spin_lock(&priv->lock);
	}
	spin_unlock(&priv->lock);
	spin_unlock_irq(&priv->tx_lock);
}

static void path_rec_completion(int status,
				struct ib_sa_path_rec *pathrec,
				void *path_ptr)
{
	struct ipoib_path *path = path_ptr;
	struct net_device *dev = path->dev;
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	struct ipoib_ah *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 " IPOIB_GID_FMT "\n",
			  be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
	else
		ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
			  status, IPOIB_GID_ARG(path->pathrec.dgid));

	skb_queue_head_init(&skqueue);

	if (!status) {
		struct ib_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);

	path->ah = ah;

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

		ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
			  ah, be16_to_cpu(pathrec->dlid), pathrec->sl);

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

		list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
			kref_get(&path->ah->ref);
			neigh->ah = path->ah;
			memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
			       sizeof(union ib_gid));

			if (ipoib_cm_enabled(dev, neigh->neighbour)) {
				if (!ipoib_cm_get(neigh))
					ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
									       path,
									       neigh));
				if (!ipoib_cm_get(neigh)) {
					list_del(&neigh->list);
					if (neigh->ah)
						ipoib_put_ah(neigh->ah);
					ipoib_neigh_free(dev, neigh);
					continue;
				}
			}

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

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

	spin_unlock_irqrestore(&priv->lock, flags);

	while ((skb = __skb_dequeue(&skqueue))) {
		skb->dev = dev;
		if (dev_queue_xmit(skb))
			ipoib_warn(priv, "dev_queue_xmit failed "
				   "to requeue packet\n");
	}
}

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

	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);

	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;

	return path;
}

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

	ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
		  IPOIB_GID_ARG(path->pathrec.dgid));

	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_PKEY,
				   1000, GFP_ATOMIC,
				   path_rec_completion,
				   path, &path->query);
	if (path->query_id < 0) {
		ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
		path->query = NULL;
		return path->query_id;
	}

	return 0;
}

static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
{
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	struct ipoib_path *path;
	struct ipoib_neigh *neigh;

	neigh = ipoib_neigh_alloc(skb->dst->neighbour);
	if (!neigh) {
		++priv->stats.tx_dropped;
		dev_kfree_skb_any(skb);
		return;
	}

	/*
	 * We can only be called from ipoib_start_xmit, so we're
	 * inside tx_lock -- no need to save/restore flags.
	 */
	spin_lock(&priv->lock);

	path = __path_find(dev, skb->dst->neighbour->ha + 4);
	if (!path) {
		path = path_rec_create(dev, skb->dst->neighbour->ha + 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;
		memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
		       sizeof(union ib_gid));

		if (ipoib_cm_enabled(dev, neigh->neighbour)) {
			if (!ipoib_cm_get(neigh))
				ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
			if (!ipoib_cm_get(neigh)) {
				list_del(&neigh->list);
				if (neigh->ah)
					ipoib_put_ah(neigh->ah);
				ipoib_neigh_free(dev, neigh);
				goto err_drop;
			}
			if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
				__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
			ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
	} else {
		neigh->ah  = NULL;

		if (!path->query && path_rec_start(dev, path))
			goto err_list;

		__skb_queue_tail(&neigh->queue, skb);
	}

	spin_unlock(&priv->lock);
	return;

err_list:
	list_del(&neigh->list);

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

	spin_unlock(&priv->lock);
}

static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
{
	struct ipoib_dev_priv *priv = netdev_priv(skb->dev);

	/* Look up path record for unicasts */
	if (skb->dst->neighbour->ha[4] != 0xff) {
		neigh_add_path(skb, dev);
		return;
	}

	/* Add in the P_Key for multicasts */
	skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
	skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
	ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
}

static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
			     struct ipoib_pseudoheader *phdr)
{
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	struct ipoib_path *path;

	/*
	 * We can only be called from ipoib_start_xmit, so we're
	 * inside tx_lock -- no need to save/restore flags.
	 */
	spin_lock(&priv->lock);

	path = __path_find(dev, phdr->hwaddr + 4);
	if (!path) {
		path = path_rec_create(dev, phdr->hwaddr + 4);
		if (path) {
			/* put pseudoheader back on for next time */
			skb_push(skb, sizeof *phdr);
			__skb_queue_tail(&path->queue, skb);

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

		spin_unlock(&priv->lock);
		return;
	}

	if (path->ah) {
		ipoib_dbg(priv, "Send unicast ARP to %04x\n",
			  be16_to_cpu(path->pathrec.dlid));

		ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
	} else if ((path->query || !path_rec_start(dev, path)) &&
		   skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
		/* put pseudoheader back on for next time */
		skb_push(skb, sizeof *phdr);
		__skb_queue_tail(&path->queue, skb);
	} else {
		++priv->stats.tx_dropped;
		dev_kfree_skb_any(skb);
	}

	spin_unlock(&priv->lock);
}

static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	struct ipoib_neigh *neigh;
	unsigned long flags;

	if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
		return NETDEV_TX_LOCKED;

	/*
	 * Check if our queue is stopped.  Since we have the LLTX bit
	 * set, we can't rely on netif_stop_queue() preventing our
	 * xmit function from being called with a full queue.
	 */
	if (unlikely(netif_queue_stopped(dev))) {
		spin_unlock_irqrestore(&priv->tx_lock, flags);
		return NETDEV_TX_BUSY;
	}

	if (likely(skb->dst && skb->dst->neighbour)) {
		if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
			ipoib_path_lookup(skb, dev);
			goto out;
		}

		neigh = *to_ipoib_neigh(skb->dst->neighbour);

		if (ipoib_cm_get(neigh)) {
			if (ipoib_cm_up(neigh)) {
				ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
				goto out;
			}
		} else if (neigh->ah) {
			if (unlikely(memcmp(&neigh->dgid.raw,
					    skb->dst->neighbour->ha + 4,
					    sizeof(union ib_gid)))) {
				spin_lock(&priv->lock);
				/*
				 * It's safe to call ipoib_put_ah() inside
				 * priv->lock here, because we know that
				 * path->ah will always hold one more reference,
				 * so ipoib_put_ah() will never do more than
				 * decrement the ref count.
				 */
				ipoib_put_ah(neigh->ah);
				list_del(&neigh->list);
				ipoib_neigh_free(dev, neigh);
				spin_unlock(&priv->lock);
				ipoib_path_lookup(skb, dev);
				goto out;
			}

			ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
			goto out;
		}

		if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
			spin_lock(&priv->lock);
			__skb_queue_tail(&neigh->queue, skb);
			spin_unlock(&priv->lock);
		} else {
			++priv->stats.tx_dropped;
			dev_kfree_skb_any(skb);
		}
	} else {
		struct ipoib_pseudoheader *phdr =
			(struct ipoib_pseudoheader *) skb->data;
		skb_pull(skb, sizeof *phdr);

		if (phdr->hwaddr[4] == 0xff) {
			/* Add in the P_Key for multicast*/
			phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
			phdr->hwaddr[9] = priv->pkey & 0xff;

			ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
		} else {
			/* unicast GID -- should be ARP or RARP reply */

			if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
			    (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
				ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
					   IPOIB_GID_FMT "\n",
					   skb->dst ? "neigh" : "dst",
					   be16_to_cpup((__be16 *) skb->data),
					   IPOIB_QPN(phdr->hwaddr),
					   IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
				dev_kfree_skb_any(skb);
				++priv->stats.tx_dropped;
				goto out;
			}

			unicast_arp_send(skb, dev, phdr);
		}
	}

out:
	spin_unlock_irqrestore(&priv->tx_lock, flags);

	return NETDEV_TX_OK;
}

static struct net_device_stats *ipoib_get_stats(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = netdev_priv(dev);

	return &priv->stats;
}

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

	ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
		   jiffies_to_msecs(jiffies - dev->trans_start));
	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,
			     void *daddr, void *saddr, unsigned len)
{
	struct ipoib_header *header;

	header = (struct ipoib_header *) skb_push(skb, sizeof *header);

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

	/*
	 * If we don't have a neighbour structure, stuff the
	 * destination address onto the front of the skb so we can
	 * figure out where to send the packet later.
	 */
	if ((!skb->dst || !skb->dst->neighbour) && daddr) {
		struct ipoib_pseudoheader *phdr =
			(struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
		memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
	}

	return 0;
}

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

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

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

static void ipoib_neigh_cleanup(struct neighbour *n)
{
	struct ipoib_neigh *neigh;
	struct ipoib_dev_priv *priv = netdev_priv(n->dev);
	unsigned long flags;
	struct ipoib_ah *ah = NULL;

	ipoib_dbg(priv,
		  "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
		  IPOIB_QPN(n->ha),
		  IPOIB_GID_RAW_ARG(n->ha + 4));

	spin_lock_irqsave(&priv->lock, flags);

	neigh = *to_ipoib_neigh(n);
	if (neigh) {
		if (neigh->ah)
			ah = neigh->ah;
		list_del(&neigh->list);
		ipoib_neigh_free(n->dev, neigh);
	}

	spin_unlock_irqrestore(&priv->lock, flags);

	if (ah)
		ipoib_put_ah(ah);
}

struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
{
	struct ipoib_neigh *neigh;

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

	neigh->neighbour = neighbour;
	*to_ipoib_neigh(neighbour) = neigh;
	skb_queue_head_init(&neigh->queue);
	ipoib_cm_set(neigh, NULL);

	return neigh;
}

void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
{
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	struct sk_buff *skb;
	*to_ipoib_neigh(neigh->neighbour) = NULL;
	while ((skb = __skb_dequeue(&neigh->queue))) {
		++priv->stats.tx_dropped;
		dev_kfree_skb_any(skb);
	}
	if (ipoib_cm_get(neigh))
		ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
	kfree(neigh);
}

static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
{
	parms->neigh_cleanup = ipoib_neigh_cleanup;

	return 0;
}

int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
{
	struct ipoib_dev_priv *priv = netdev_priv(dev);

	/* 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) {
		printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
		       ca->name, ipoib_recvq_size);
		goto out;
	}

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

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

	if (ipoib_ib_dev_init(dev, ca, port))
		goto out_tx_ring_cleanup;

	return 0;

out_tx_ring_cleanup:
	kfree(priv->tx_ring);

out_rx_ring_cleanup:
	kfree(priv->rx_ring);

out:
	return -ENOMEM;
}

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

	ipoib_delete_debug_files(dev);

	/* Delete any child interfaces first */
	list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
		unregister_netdev(cpriv->dev);
		ipoib_dev_cleanup(cpriv->dev);
		free_netdev(cpriv->dev);
	}

	ipoib_ib_dev_cleanup(dev);

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

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

static void ipoib_setup(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = netdev_priv(dev);

	dev->open 		 = ipoib_open;
	dev->stop 		 = ipoib_stop;
	dev->change_mtu 	 = ipoib_change_mtu;
	dev->hard_start_xmit 	 = ipoib_start_xmit;
	dev->get_stats 		 = ipoib_get_stats;
	dev->tx_timeout 	 = ipoib_timeout;
	dev->hard_header 	 = ipoib_hard_header;
	dev->set_multicast_list  = ipoib_set_mcast_list;
	dev->neigh_setup         = ipoib_neigh_setup_dev;

	dev->watchdog_timeo 	 = HZ;

	dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;

	/*
	 * We add in INFINIBAND_ALEN to allow for the destination
	 * address "pseudoheader" for skbs without neighbour struct.
	 */
	dev->hard_header_len 	 = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
	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_LLTX;

	/* MTU will be reset when mcast join happens */
	dev->mtu 		 = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
	priv->mcast_mtu 	 = priv->admin_mtu = dev->mtu;

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

	netif_carrier_off(dev);

	SET_MODULE_OWNER(dev);

	priv->dev = dev;

	spin_lock_init(&priv->lock);
	spin_lock_init(&priv->tx_lock);

	mutex_init(&priv->mcast_mutex);
	mutex_init(&priv->vlan_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->pkey_task,    ipoib_pkey_poll);
	INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
	INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush);
	INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
	INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
}

struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
{
	struct net_device *dev;

	dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
			   ipoib_setup);
	if (!dev)
		return NULL;

	return netdev_priv(dev);
}

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

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

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)
		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_IWUGO, 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_IWUGO, NULL, delete_child);

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

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

	priv = ipoib_intf_alloc(format);
	if (!priv)
		goto alloc_mem_failed;

	SET_NETDEV_DEV(priv->dev, hca->dma_device);

	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 alloc_mem_failed;
	}

	/*
	 * 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);
	if (result) {
		printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
		       hca->name, port, result);
		goto alloc_mem_failed;
	} else
		memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));


	result = ipoib_dev_init(priv->dev, hca, port);
	if (result < 0) {
		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;
	}

	ipoib_create_debug_files(priv->dev);

	if (ipoib_cm_add_mode_attr(priv->dev))
		goto sysfs_failed;
	if (ipoib_add_pkey_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:
	ipoib_delete_debug_files(priv->dev);
	unregister_netdev(priv->dev);

register_failed:
	ib_unregister_event_handler(&priv->event_handler);
	flush_scheduled_work();

event_failed:
	ipoib_dev_cleanup(priv->dev);

device_init_failed:
	free_netdev(priv->dev);

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 s, e, p;

	if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
		return;

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

	INIT_LIST_HEAD(dev_list);

	if (device->node_type == RDMA_NODE_IB_SWITCH) {
		s = 0;
		e = 0;
	} else {
		s = 1;
		e = device->phys_port_cnt;
	}

	for (p = s; p <= e; ++p) {
		dev = ipoib_add_port("ib%d", device, p);
		if (!IS_ERR(dev)) {
			priv = netdev_priv(dev);
			list_add_tail(&priv->list, dev_list);
		}
	}

	ib_set_client_data(device, &ipoib_client, dev_list);
}

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

	if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
		return;

	dev_list = ib_get_client_data(device, &ipoib_client);

	list_for_each_entry_safe(priv, tmp, dev_list, list) {
		ib_unregister_event_handler(&priv->event_handler);
		flush_scheduled_work();

		unregister_netdev(priv->dev);
		ipoib_dev_cleanup(priv->dev);
		free_netdev(priv->dev);
	}

	kfree(dev_list);
}

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 = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);

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

	/*
	 * We create our own workqueue mainly because we want to be
	 * able to flush it when devices are being removed.  We can't
	 * use schedule_work()/flush_scheduled_work() because both
	 * unregister_netdev() and linkwatch_event take the rtnl lock,
	 * so flush_scheduled_work() can deadlock during device
	 * removal.
	 */
	ipoib_workqueue = create_singlethread_workqueue("ipoib");
	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;

	return 0;

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)
{
	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);
OpenPOWER on IntegriCloud