aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/ulp/ipoib/ipoib_ib.c
blob: 1ecf21006f72e1dd33a9d2710cfff84cfdf5c335 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
/*
 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2004, 2005 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 <linux/delay.h>
#include <linux/moduleparam.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>

#include <linux/ip.h>
#include <linux/tcp.h>
#include <rdma/ib_cache.h>

#include "ipoib.h"

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
static int data_debug_level;

module_param(data_debug_level, int, 0644);
MODULE_PARM_DESC(data_debug_level,
		 "Enable data path debug tracing if > 0");
#endif

struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
				 struct ib_pd *pd, struct rdma_ah_attr *attr)
{
	struct ipoib_ah *ah;
	struct ib_ah *vah;

	ah = kmalloc(sizeof(*ah), GFP_KERNEL);
	if (!ah)
		return ERR_PTR(-ENOMEM);

	ah->dev       = dev;
	ah->last_send = 0;
	kref_init(&ah->ref);

	vah = rdma_create_ah(pd, attr, RDMA_CREATE_AH_SLEEPABLE);
	if (IS_ERR(vah)) {
		kfree(ah);
		ah = (struct ipoib_ah *)vah;
	} else {
		ah->ah = vah;
		ipoib_dbg(ipoib_priv(dev), "Created ah %p\n", ah->ah);
	}

	return ah;
}

void ipoib_free_ah(struct kref *kref)
{
	struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
	struct ipoib_dev_priv *priv = ipoib_priv(ah->dev);

	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	list_add_tail(&ah->list, &priv->dead_ahs);
	spin_unlock_irqrestore(&priv->lock, flags);
}

static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
				  u64 mapping[IPOIB_UD_RX_SG])
{
	ib_dma_unmap_single(priv->ca, mapping[0],
			    IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
			    DMA_FROM_DEVICE);
}

static int ipoib_ib_post_receive(struct net_device *dev, int id)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	int ret;

	priv->rx_wr.wr_id   = id | IPOIB_OP_RECV;
	priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
	priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];


	ret = ib_post_recv(priv->qp, &priv->rx_wr, NULL);
	if (unlikely(ret)) {
		ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
		ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
		dev_kfree_skb_any(priv->rx_ring[id].skb);
		priv->rx_ring[id].skb = NULL;
	}

	return ret;
}

static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct sk_buff *skb;
	int buf_size;
	u64 *mapping;

	buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);

	skb = dev_alloc_skb(buf_size + IPOIB_HARD_LEN);
	if (unlikely(!skb))
		return NULL;

	/*
	 * the IP header will be at IPOIP_HARD_LEN + IB_GRH_BYTES, that is
	 * 64 bytes aligned
	 */
	skb_reserve(skb, sizeof(struct ipoib_pseudo_header));

	mapping = priv->rx_ring[id].mapping;
	mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
				       DMA_FROM_DEVICE);
	if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
		goto error;

	priv->rx_ring[id].skb = skb;
	return skb;
error:
	dev_kfree_skb_any(skb);
	return NULL;
}

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

	for (i = 0; i < ipoib_recvq_size; ++i) {
		if (!ipoib_alloc_rx_skb(dev, i)) {
			ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
			return -ENOMEM;
		}
		if (ipoib_ib_post_receive(dev, i)) {
			ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
			return -EIO;
		}
	}

	return 0;
}

static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
	struct sk_buff *skb;
	u64 mapping[IPOIB_UD_RX_SG];
	union ib_gid *dgid;
	union ib_gid *sgid;

	ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
		       wr_id, wc->status);

	if (unlikely(wr_id >= ipoib_recvq_size)) {
		ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
			   wr_id, ipoib_recvq_size);
		return;
	}

	skb  = priv->rx_ring[wr_id].skb;

	if (unlikely(wc->status != IB_WC_SUCCESS)) {
		if (wc->status != IB_WC_WR_FLUSH_ERR)
			ipoib_warn(priv,
				   "failed recv event (status=%d, wrid=%d vend_err %#x)\n",
				   wc->status, wr_id, wc->vendor_err);
		ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
		dev_kfree_skb_any(skb);
		priv->rx_ring[wr_id].skb = NULL;
		return;
	}

	memcpy(mapping, priv->rx_ring[wr_id].mapping,
	       IPOIB_UD_RX_SG * sizeof(*mapping));

	/*
	 * If we can't allocate a new RX buffer, dump
	 * this packet and reuse the old buffer.
	 */
	if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
		++dev->stats.rx_dropped;
		goto repost;
	}

	ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
		       wc->byte_len, wc->slid);

	ipoib_ud_dma_unmap_rx(priv, mapping);

	skb_put(skb, wc->byte_len);

	/* First byte of dgid signals multicast when 0xff */
	dgid = &((struct ib_grh *)skb->data)->dgid;

	if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
		skb->pkt_type = PACKET_HOST;
	else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
		skb->pkt_type = PACKET_BROADCAST;
	else
		skb->pkt_type = PACKET_MULTICAST;

	sgid = &((struct ib_grh *)skb->data)->sgid;

	/*
	 * Drop packets that this interface sent, ie multicast packets
	 * that the HCA has replicated.
	 */
	if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) {
		int need_repost = 1;

		if ((wc->wc_flags & IB_WC_GRH) &&
		    sgid->global.interface_id != priv->local_gid.global.interface_id)
			need_repost = 0;

		if (need_repost) {
			dev_kfree_skb_any(skb);
			goto repost;
		}
	}

	skb_pull(skb, IB_GRH_BYTES);

	skb->protocol = ((struct ipoib_header *) skb->data)->proto;
	skb_add_pseudo_hdr(skb);

	++dev->stats.rx_packets;
	dev->stats.rx_bytes += skb->len;
	if (skb->pkt_type == PACKET_MULTICAST)
		dev->stats.multicast++;

	skb->dev = dev;
	if ((dev->features & NETIF_F_RXCSUM) &&
			likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
		skb->ip_summed = CHECKSUM_UNNECESSARY;

	napi_gro_receive(&priv->recv_napi, skb);

repost:
	if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
		ipoib_warn(priv, "ipoib_ib_post_receive failed "
			   "for buf %d\n", wr_id);
}

int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
{
	struct sk_buff *skb = tx_req->skb;
	u64 *mapping = tx_req->mapping;
	int i;
	int off;

	if (skb_headlen(skb)) {
		mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
					       DMA_TO_DEVICE);
		if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
			return -EIO;

		off = 1;
	} else
		off = 0;

	for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
		mapping[i + off] = ib_dma_map_page(ca,
						 skb_frag_page(frag),
						 frag->page_offset, skb_frag_size(frag),
						 DMA_TO_DEVICE);
		if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
			goto partial_error;
	}
	return 0;

partial_error:
	for (; i > 0; --i) {
		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];

		ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
	}

	if (off)
		ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);

	return -EIO;
}

void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv,
			struct ipoib_tx_buf *tx_req)
{
	struct sk_buff *skb = tx_req->skb;
	u64 *mapping = tx_req->mapping;
	int i;
	int off;

	if (skb_headlen(skb)) {
		ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb),
				    DMA_TO_DEVICE);
		off = 1;
	} else
		off = 0;

	for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

		ib_dma_unmap_page(priv->ca, mapping[i + off],
				  skb_frag_size(frag), DMA_TO_DEVICE);
	}
}

/*
 * As the result of a completion error the QP Can be transferred to SQE states.
 * The function checks if the (send)QP is in SQE state and
 * moves it back to RTS state, that in order to have it functional again.
 */
static void ipoib_qp_state_validate_work(struct work_struct *work)
{
	struct ipoib_qp_state_validate *qp_work =
		container_of(work, struct ipoib_qp_state_validate, work);

	struct ipoib_dev_priv *priv = qp_work->priv;
	struct ib_qp_attr qp_attr;
	struct ib_qp_init_attr query_init_attr;
	int ret;

	ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr);
	if (ret) {
		ipoib_warn(priv, "%s: Failed to query QP ret: %d\n",
			   __func__, ret);
		goto free_res;
	}
	pr_info("%s: QP: 0x%x is in state: %d\n",
		__func__, priv->qp->qp_num, qp_attr.qp_state);

	/* currently support only in SQE->RTS transition*/
	if (qp_attr.qp_state == IB_QPS_SQE) {
		qp_attr.qp_state = IB_QPS_RTS;

		ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE);
		if (ret) {
			pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n",
				ret, priv->qp->qp_num);
			goto free_res;
		}
		pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n",
			__func__, priv->qp->qp_num);
	} else {
		pr_warn("QP (%d) will stay in state: %d\n",
			priv->qp->qp_num, qp_attr.qp_state);
	}

free_res:
	kfree(qp_work);
}

static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	unsigned int wr_id = wc->wr_id;
	struct ipoib_tx_buf *tx_req;

	ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
		       wr_id, wc->status);

	if (unlikely(wr_id >= ipoib_sendq_size)) {
		ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
			   wr_id, ipoib_sendq_size);
		return;
	}

	tx_req = &priv->tx_ring[wr_id];

	ipoib_dma_unmap_tx(priv, tx_req);

	++dev->stats.tx_packets;
	dev->stats.tx_bytes += tx_req->skb->len;

	dev_kfree_skb_any(tx_req->skb);

	++priv->tx_tail;

	if (unlikely(netif_queue_stopped(dev) &&
		     ((priv->tx_head - priv->tx_tail) <= ipoib_sendq_size >> 1) &&
		     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
		netif_wake_queue(dev);

	if (wc->status != IB_WC_SUCCESS &&
	    wc->status != IB_WC_WR_FLUSH_ERR) {
		struct ipoib_qp_state_validate *qp_work;
		ipoib_warn(priv,
			   "failed send event (status=%d, wrid=%d vend_err %#x)\n",
			   wc->status, wr_id, wc->vendor_err);
		qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC);
		if (!qp_work)
			return;

		INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work);
		qp_work->priv = priv;
		queue_work(priv->wq, &qp_work->work);
	}
}

static int poll_tx(struct ipoib_dev_priv *priv)
{
	int n, i;
	struct ib_wc *wc;

	n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
	for (i = 0; i < n; ++i) {
		wc = priv->send_wc + i;
		if (wc->wr_id & IPOIB_OP_CM)
			ipoib_cm_handle_tx_wc(priv->dev, priv->send_wc + i);
		else
			ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
	}
	return n == MAX_SEND_CQE;
}

int ipoib_rx_poll(struct napi_struct *napi, int budget)
{
	struct ipoib_dev_priv *priv =
		container_of(napi, struct ipoib_dev_priv, recv_napi);
	struct net_device *dev = priv->dev;
	int done;
	int t;
	int n, i;

	done  = 0;

poll_more:
	while (done < budget) {
		int max = (budget - done);

		t = min(IPOIB_NUM_WC, max);
		n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);

		for (i = 0; i < n; i++) {
			struct ib_wc *wc = priv->ibwc + i;

			if (wc->wr_id & IPOIB_OP_RECV) {
				++done;
				if (wc->wr_id & IPOIB_OP_CM)
					ipoib_cm_handle_rx_wc(dev, wc);
				else
					ipoib_ib_handle_rx_wc(dev, wc);
			} else {
				pr_warn("%s: Got unexpected wqe id\n", __func__);
			}
		}

		if (n != t)
			break;
	}

	if (done < budget) {
		napi_complete(napi);
		if (unlikely(ib_req_notify_cq(priv->recv_cq,
					      IB_CQ_NEXT_COMP |
					      IB_CQ_REPORT_MISSED_EVENTS)) &&
		    napi_reschedule(napi))
			goto poll_more;
	}

	return done;
}

int ipoib_tx_poll(struct napi_struct *napi, int budget)
{
	struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv,
						   send_napi);
	struct net_device *dev = priv->dev;
	int n, i;
	struct ib_wc *wc;

poll_more:
	n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);

	for (i = 0; i < n; i++) {
		wc = priv->send_wc + i;
		if (wc->wr_id & IPOIB_OP_CM)
			ipoib_cm_handle_tx_wc(dev, wc);
		else
			ipoib_ib_handle_tx_wc(dev, wc);
	}

	if (n < budget) {
		napi_complete(napi);
		if (unlikely(ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
					      IB_CQ_REPORT_MISSED_EVENTS)) &&
		    napi_reschedule(napi))
			goto poll_more;
	}
	return n < 0 ? 0 : n;
}

void ipoib_ib_rx_completion(struct ib_cq *cq, void *ctx_ptr)
{
	struct ipoib_dev_priv *priv = ctx_ptr;

	napi_schedule(&priv->recv_napi);
}

void ipoib_ib_tx_completion(struct ib_cq *cq, void *ctx_ptr)
{
	struct ipoib_dev_priv *priv = ctx_ptr;

	napi_schedule(&priv->send_napi);
}

static inline int post_send(struct ipoib_dev_priv *priv,
			    unsigned int wr_id,
			    struct ib_ah *address, u32 dqpn,
			    struct ipoib_tx_buf *tx_req,
			    void *head, int hlen)
{
	struct sk_buff *skb = tx_req->skb;

	ipoib_build_sge(priv, tx_req);

	priv->tx_wr.wr.wr_id	= wr_id;
	priv->tx_wr.remote_qpn	= dqpn;
	priv->tx_wr.ah		= address;

	if (head) {
		priv->tx_wr.mss		= skb_shinfo(skb)->gso_size;
		priv->tx_wr.header	= head;
		priv->tx_wr.hlen	= hlen;
		priv->tx_wr.wr.opcode	= IB_WR_LSO;
	} else
		priv->tx_wr.wr.opcode	= IB_WR_SEND;

	return ib_post_send(priv->qp, &priv->tx_wr.wr, NULL);
}

int ipoib_send(struct net_device *dev, struct sk_buff *skb,
	       struct ib_ah *address, u32 dqpn)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct ipoib_tx_buf *tx_req;
	int hlen, rc;
	void *phead;
	unsigned int usable_sge = priv->max_send_sge - !!skb_headlen(skb);

	if (skb_is_gso(skb)) {
		hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
		phead = skb->data;
		if (unlikely(!skb_pull(skb, hlen))) {
			ipoib_warn(priv, "linear data too small\n");
			++dev->stats.tx_dropped;
			++dev->stats.tx_errors;
			dev_kfree_skb_any(skb);
			return -1;
		}
	} else {
		if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
			ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
				   skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
			++dev->stats.tx_dropped;
			++dev->stats.tx_errors;
			ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
			return -1;
		}
		phead = NULL;
		hlen  = 0;
	}
	if (skb_shinfo(skb)->nr_frags > usable_sge) {
		if (skb_linearize(skb) < 0) {
			ipoib_warn(priv, "skb could not be linearized\n");
			++dev->stats.tx_dropped;
			++dev->stats.tx_errors;
			dev_kfree_skb_any(skb);
			return -1;
		}
		/* Does skb_linearize return ok without reducing nr_frags? */
		if (skb_shinfo(skb)->nr_frags > usable_sge) {
			ipoib_warn(priv, "too many frags after skb linearize\n");
			++dev->stats.tx_dropped;
			++dev->stats.tx_errors;
			dev_kfree_skb_any(skb);
			return -1;
		}
	}

	ipoib_dbg_data(priv,
		       "sending packet, length=%d address=%p dqpn=0x%06x\n",
		       skb->len, address, dqpn);

	/*
	 * We put the skb into the tx_ring _before_ we call post_send()
	 * because it's entirely possible that the completion handler will
	 * run before we execute anything after the post_send().  That
	 * means we have to make sure everything is properly recorded and
	 * our state is consistent before we call post_send().
	 */
	tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
	tx_req->skb = skb;
	if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
		++dev->stats.tx_errors;
		dev_kfree_skb_any(skb);
		return -1;
	}

	if (skb->ip_summed == CHECKSUM_PARTIAL)
		priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
	else
		priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
	/* increase the tx_head after send success, but use it for queue state */
	if (priv->tx_head - priv->tx_tail == ipoib_sendq_size - 1) {
		ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
		netif_stop_queue(dev);
	}

	skb_orphan(skb);
	skb_dst_drop(skb);

	if (netif_queue_stopped(dev))
		if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
				     IB_CQ_REPORT_MISSED_EVENTS) < 0)
			ipoib_warn(priv, "request notify on send CQ failed\n");

	rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
		       address, dqpn, tx_req, phead, hlen);
	if (unlikely(rc)) {
		ipoib_warn(priv, "post_send failed, error %d\n", rc);
		++dev->stats.tx_errors;
		ipoib_dma_unmap_tx(priv, tx_req);
		dev_kfree_skb_any(skb);
		if (netif_queue_stopped(dev))
			netif_wake_queue(dev);
		rc = 0;
	} else {
		netif_trans_update(dev);

		rc = priv->tx_head;
		++priv->tx_head;
	}
	return rc;
}

static void __ipoib_reap_ah(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct ipoib_ah *ah, *tah;
	LIST_HEAD(remove_list);
	unsigned long flags;

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

	list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
		if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
			list_del(&ah->list);
			rdma_destroy_ah(ah->ah);
			kfree(ah);
		}

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

void ipoib_reap_ah(struct work_struct *work)
{
	struct ipoib_dev_priv *priv =
		container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
	struct net_device *dev = priv->dev;

	__ipoib_reap_ah(dev);

	if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
		queue_delayed_work(priv->wq, &priv->ah_reap_task,
				   round_jiffies_relative(HZ));
}

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

	cancel_delayed_work(&priv->ah_reap_task);
	flush_workqueue(priv->wq);
	ipoib_reap_ah(&priv->ah_reap_task.work);
}

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

	set_bit(IPOIB_STOP_REAPER, &priv->flags);
	ipoib_flush_ah(dev);
}

static int recvs_pending(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	int pending = 0;
	int i;

	for (i = 0; i < ipoib_recvq_size; ++i)
		if (priv->rx_ring[i].skb)
			++pending;

	return pending;
}

static void check_qp_movement_and_print(struct ipoib_dev_priv *priv,
					struct ib_qp *qp,
					enum ib_qp_state new_state)
{
	struct ib_qp_attr qp_attr;
	struct ib_qp_init_attr query_init_attr;
	int ret;

	ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr);
	if (ret) {
		ipoib_warn(priv, "%s: Failed to query QP\n", __func__);
		return;
	}
	/* print according to the new-state and the previous state.*/
	if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET)
		ipoib_dbg(priv, "Failed modify QP, IB_QPS_RESET to IB_QPS_ERR, acceptable\n");
	else
		ipoib_warn(priv, "Failed to modify QP to state: %d from state: %d\n",
			   new_state, qp_attr.qp_state);
}

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

	napi_enable(&priv->recv_napi);
	napi_enable(&priv->send_napi);
}

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

	napi_disable(&priv->recv_napi);
	napi_disable(&priv->send_napi);
}

int ipoib_ib_dev_stop_default(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct ib_qp_attr qp_attr;
	unsigned long begin;
	struct ipoib_tx_buf *tx_req;
	int i;

	if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
		ipoib_napi_disable(dev);

	ipoib_cm_dev_stop(dev);

	/*
	 * Move our QP to the error state and then reinitialize in
	 * when all work requests have completed or have been flushed.
	 */
	qp_attr.qp_state = IB_QPS_ERR;
	if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
		check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR);

	/* Wait for all sends and receives to complete */
	begin = jiffies;

	while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
		if (time_after(jiffies, begin + 5 * HZ)) {
			ipoib_warn(priv,
				   "timing out; %d sends %d receives not completed\n",
				   priv->tx_head - priv->tx_tail,
				   recvs_pending(dev));

			/*
			 * assume the HW is wedged and just free up
			 * all our pending work requests.
			 */
			while ((int)priv->tx_tail - (int)priv->tx_head < 0) {
				tx_req = &priv->tx_ring[priv->tx_tail &
							(ipoib_sendq_size - 1)];
				ipoib_dma_unmap_tx(priv, tx_req);
				dev_kfree_skb_any(tx_req->skb);
				++priv->tx_tail;
			}

			for (i = 0; i < ipoib_recvq_size; ++i) {
				struct ipoib_rx_buf *rx_req;

				rx_req = &priv->rx_ring[i];
				if (!rx_req->skb)
					continue;
				ipoib_ud_dma_unmap_rx(priv,
						      priv->rx_ring[i].mapping);
				dev_kfree_skb_any(rx_req->skb);
				rx_req->skb = NULL;
			}

			goto timeout;
		}

		ipoib_drain_cq(dev);

		usleep_range(1000, 2000);
	}

	ipoib_dbg(priv, "All sends and receives done.\n");

timeout:
	qp_attr.qp_state = IB_QPS_RESET;
	if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
		ipoib_warn(priv, "Failed to modify QP to RESET state\n");

	ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);

	return 0;
}

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

	priv->rn_ops->ndo_stop(dev);

	clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
	ipoib_flush_ah(dev);

	return 0;
}

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

	ret = ipoib_init_qp(dev);
	if (ret) {
		ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
		return -1;
	}

	ret = ipoib_ib_post_receives(dev);
	if (ret) {
		ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
		goto out;
	}

	ret = ipoib_cm_dev_open(dev);
	if (ret) {
		ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
		goto out;
	}

	if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
		ipoib_napi_enable(dev);

	return 0;
out:
	return -1;
}

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

	ipoib_pkey_dev_check_presence(dev);

	if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
		ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
			   (!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
		return -1;
	}

	clear_bit(IPOIB_STOP_REAPER, &priv->flags);
	queue_delayed_work(priv->wq, &priv->ah_reap_task,
			   round_jiffies_relative(HZ));

	if (priv->rn_ops->ndo_open(dev)) {
		pr_warn("%s: Failed to open dev\n", dev->name);
		goto dev_stop;
	}

	set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);

	return 0;

dev_stop:
	set_bit(IPOIB_STOP_REAPER, &priv->flags);
	cancel_delayed_work(&priv->ah_reap_task);
	set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
	ipoib_ib_dev_stop(dev);
	return -1;
}

void ipoib_pkey_dev_check_presence(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	struct rdma_netdev *rn = netdev_priv(dev);

	if (!(priv->pkey & 0x7fff) ||
	    ib_find_pkey(priv->ca, priv->port, priv->pkey,
			 &priv->pkey_index)) {
		clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
	} else {
		if (rn->set_id)
			rn->set_id(dev, priv->pkey_index);
		set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
	}
}

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

	ipoib_pkey_dev_check_presence(dev);

	if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
		ipoib_dbg(priv, "PKEY is not assigned.\n");
		return;
	}

	set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);

	ipoib_mcast_start_thread(dev);
}

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

	ipoib_dbg(priv, "downing ib_dev\n");

	clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
	netif_carrier_off(dev);

	ipoib_mcast_stop_thread(dev);
	ipoib_mcast_dev_flush(dev);

	ipoib_flush_paths(dev);
}

void ipoib_drain_cq(struct net_device *dev)
{
	struct ipoib_dev_priv *priv = ipoib_priv(dev);
	int i, n;

	/*
	 * We call completion handling routines that expect to be
	 * called from the BH-disabled NAPI poll context, so disable
	 * BHs here too.
	 */
	local_bh_disable();

	do {
		n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
		for (i = 0; i < n; ++i) {
			/*
			 * Convert any successful completions to flush
			 * errors to avoid passing packets up the
			 * stack after bringing the device down.
			 */
			if (priv->ibwc[i].status == IB_WC_SUCCESS)
				priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;

			if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
				if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
					ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
				else
					ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
			} else {
				pr_warn("%s: Got unexpected wqe id\n", __func__);
			}
		}
	} while (n == IPOIB_NUM_WC);

	while (poll_tx(priv))
		; /* nothing */

	local_bh_enable();
}

/*
 * Takes whatever value which is in pkey index 0 and updates priv->pkey
 * returns 0 if the pkey value was changed.
 */
static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
{
	int result;
	u16 prev_pkey;

	prev_pkey = priv->pkey;
	result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
	if (result) {
		ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
			   priv->port, result);
		return result;
	}

	priv->pkey |= 0x8000;

	if (prev_pkey != priv->pkey) {
		ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
			  prev_pkey, priv->pkey);
		/*
		 * Update the pkey in the broadcast address, while making sure to set
		 * the full membership bit, so that we join the right broadcast group.
		 */
		priv->dev->broadcast[8] = priv->pkey >> 8;
		priv->dev->broadcast[9] = priv->pkey & 0xff;
		return 0;
	}

	return 1;
}
/*
 * returns 0 if pkey value was found in a different slot.
 */
static inline int update_child_pkey(struct ipoib_dev_priv *priv)
{
	u16 old_index = priv->pkey_index;

	priv->pkey_index = 0;
	ipoib_pkey_dev_check_presence(priv->dev);

	if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
	    (old_index == priv->pkey_index))
		return 1;
	return 0;
}

/*
 * returns true if the device address of the ipoib interface has changed and the
 * new address is a valid one (i.e in the gid table), return false otherwise.
 */
static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv)
{
	union ib_gid search_gid;
	union ib_gid gid0;
	union ib_gid *netdev_gid;
	int err;
	u16 index;
	u8 port;
	bool ret = false;

	netdev_gid = (union ib_gid *)(priv->dev->dev_addr + 4);
	if (rdma_query_gid(priv->ca, priv->port, 0, &gid0))
		return false;

	netif_addr_lock_bh(priv->dev);

	/* The subnet prefix may have changed, update it now so we won't have
	 * to do it later
	 */
	priv->local_gid.global.subnet_prefix = gid0.global.subnet_prefix;
	netdev_gid->global.subnet_prefix = gid0.global.subnet_prefix;
	search_gid.global.subnet_prefix = gid0.global.subnet_prefix;

	search_gid.global.interface_id = priv->local_gid.global.interface_id;

	netif_addr_unlock_bh(priv->dev);

	err = ib_find_gid(priv->ca, &search_gid, &port, &index);

	netif_addr_lock_bh(priv->dev);

	if (search_gid.global.interface_id !=
	    priv->local_gid.global.interface_id)
		/* There was a change while we were looking up the gid, bail
		 * here and let the next work sort this out
		 */
		goto out;

	/* The next section of code needs some background:
	 * Per IB spec the port GUID can't change if the HCA is powered on.
	 * port GUID is the basis for GID at index 0 which is the basis for
	 * the default device address of a ipoib interface.
	 *
	 * so it seems the flow should be:
	 * if user_changed_dev_addr && gid in gid tbl
	 *	set bit dev_addr_set
	 *	return true
	 * else
	 *	return false
	 *
	 * The issue is that there are devices that don't follow the spec,
	 * they change the port GUID when the HCA is powered, so in order
	 * not to break userspace applications, We need to check if the
	 * user wanted to control the device address and we assume that
	 * if he sets the device address back to be based on GID index 0,
	 * he no longer wishs to control it.
	 *
	 * If the user doesn't control the the device address,
	 * IPOIB_FLAG_DEV_ADDR_SET is set and ib_find_gid failed it means
	 * the port GUID has changed and GID at index 0 has changed
	 * so we need to change priv->local_gid and priv->dev->dev_addr
	 * to reflect the new GID.
	 */
	if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
		if (!err && port == priv->port) {
			set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
			if (index == 0)
				clear_bit(IPOIB_FLAG_DEV_ADDR_CTRL,
					  &priv->flags);
			else
				set_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags);
			ret = true;
		} else {
			ret = false;
		}
	} else {
		if (!err && port == priv->port) {
			ret = true;
		} else {
			if (!test_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags)) {
				memcpy(&priv->local_gid, &gid0,
				       sizeof(priv->local_gid));
				memcpy(priv->dev->dev_addr + 4, &gid0,
				       sizeof(priv->local_gid));
				ret = true;
			}
		}
	}

out:
	netif_addr_unlock_bh(priv->dev);

	return ret;
}

static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
				enum ipoib_flush_level level,
				int nesting)
{
	struct ipoib_dev_priv *cpriv;
	struct net_device *dev = priv->dev;
	int result;

	down_read_nested(&priv->vlan_rwsem, nesting);

	/*
	 * Flush any child interfaces too -- they might be up even if
	 * the parent is down.
	 */
	list_for_each_entry(cpriv, &priv->child_intfs, list)
		__ipoib_ib_dev_flush(cpriv, level, nesting + 1);

	up_read(&priv->vlan_rwsem);

	if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
	    level != IPOIB_FLUSH_HEAVY) {
		/* Make sure the dev_addr is set even if not flushing */
		if (level == IPOIB_FLUSH_LIGHT)
			ipoib_dev_addr_changed_valid(priv);
		ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
		return;
	}

	if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
		/* interface is down. update pkey and leave. */
		if (level == IPOIB_FLUSH_HEAVY) {
			if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
				update_parent_pkey(priv);
			else
				update_child_pkey(priv);
		} else if (level == IPOIB_FLUSH_LIGHT)
			ipoib_dev_addr_changed_valid(priv);
		ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
		return;
	}

	if (level == IPOIB_FLUSH_HEAVY) {
		/* child devices chase their origin pkey value, while non-child
		 * (parent) devices should always takes what present in pkey index 0
		 */
		if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
			result = update_child_pkey(priv);
			if (result) {
				/* restart QP only if P_Key index is changed */
				ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
				return;
			}

		} else {
			result = update_parent_pkey(priv);
			/* restart QP only if P_Key value changed */
			if (result) {
				ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
				return;
			}
		}
	}

	if (level == IPOIB_FLUSH_LIGHT) {
		int oper_up;
		ipoib_mark_paths_invalid(dev);
		/* Set IPoIB operation as down to prevent races between:
		 * the flush flow which leaves MCG and on the fly joins
		 * which can happen during that time. mcast restart task
		 * should deal with join requests we missed.
		 */
		oper_up = test_and_clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
		ipoib_mcast_dev_flush(dev);
		if (oper_up)
			set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
		ipoib_flush_ah(dev);
	}

	if (level >= IPOIB_FLUSH_NORMAL)
		ipoib_ib_dev_down(dev);

	if (level == IPOIB_FLUSH_HEAVY) {
		if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
			ipoib_ib_dev_stop(dev);

		if (ipoib_ib_dev_open(dev))
			return;

		if (netif_queue_stopped(dev))
			netif_start_queue(dev);
	}

	/*
	 * The device could have been brought down between the start and when
	 * we get here, don't bring it back up if it's not configured up
	 */
	if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
		if (level >= IPOIB_FLUSH_NORMAL)
			ipoib_ib_dev_up(dev);
		if (ipoib_dev_addr_changed_valid(priv))
			ipoib_mcast_restart_task(&priv->restart_task);
	}
}

void ipoib_ib_dev_flush_light(struct work_struct *work)
{
	struct ipoib_dev_priv *priv =
		container_of(work, struct ipoib_dev_priv, flush_light);

	__ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0);
}

void ipoib_ib_dev_flush_normal(struct work_struct *work)
{
	struct ipoib_dev_priv *priv =
		container_of(work, struct ipoib_dev_priv, flush_normal);

	__ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0);
}

void ipoib_ib_dev_flush_heavy(struct work_struct *work)
{
	struct ipoib_dev_priv *priv =
		container_of(work, struct ipoib_dev_priv, flush_heavy);

	rtnl_lock();
	__ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0);
	rtnl_unlock();
}

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

	ipoib_dbg(priv, "cleaning up ib_dev\n");
	/*
	 * We must make sure there are no more (path) completions
	 * that may wish to touch priv fields that are no longer valid
	 */
	ipoib_flush_paths(dev);

	ipoib_mcast_stop_thread(dev);
	ipoib_mcast_dev_flush(dev);

	/*
	 * All of our ah references aren't free until after
	 * ipoib_mcast_dev_flush(), ipoib_flush_paths, and
	 * the neighbor garbage collection is stopped and reaped.
	 * That should all be done now, so make a final ah flush.
	 */
	ipoib_stop_ah(dev);

	clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);

	priv->rn_ops->ndo_uninit(dev);

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