aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/amso1100/c2.c
blob: dc1ebeac35c7d74b2e480b3362d5742a2f2f1d07 (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
/*
 * Copyright (c) 2005 Ammasso, Inc. All rights reserved.
 * Copyright (c) 2005 Open Grid Computing, 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/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/inetdevice.h>
#include <linux/delay.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/if_vlan.h>
#include <linux/crc32.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/byteorder.h>

#include <rdma/ib_smi.h>
#include "c2.h"
#include "c2_provider.h"

MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
MODULE_DESCRIPTION("Ammasso AMSO1100 Low-level iWARP Driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(DRV_VERSION);

static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK
    | NETIF_MSG_IFUP | NETIF_MSG_IFDOWN;

static int debug = -1;		/* defaults above */
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");

static int c2_up(struct net_device *netdev);
static int c2_down(struct net_device *netdev);
static int c2_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
static void c2_tx_interrupt(struct net_device *netdev);
static void c2_rx_interrupt(struct net_device *netdev);
static irqreturn_t c2_interrupt(int irq, void *dev_id);
static void c2_tx_timeout(struct net_device *netdev);
static int c2_change_mtu(struct net_device *netdev, int new_mtu);
static void c2_reset(struct c2_port *c2_port);
static struct net_device_stats *c2_get_stats(struct net_device *netdev);

static struct pci_device_id c2_pci_table[] = {
	{ PCI_DEVICE(0x18b8, 0xb001) },
	{ 0 }
};

MODULE_DEVICE_TABLE(pci, c2_pci_table);

static void c2_print_macaddr(struct net_device *netdev)
{
	pr_debug("%s: MAC %02X:%02X:%02X:%02X:%02X:%02X, "
		"IRQ %u\n", netdev->name,
		netdev->dev_addr[0], netdev->dev_addr[1], netdev->dev_addr[2],
		netdev->dev_addr[3], netdev->dev_addr[4], netdev->dev_addr[5],
		netdev->irq);
}

static void c2_set_rxbufsize(struct c2_port *c2_port)
{
	struct net_device *netdev = c2_port->netdev;

	if (netdev->mtu > RX_BUF_SIZE)
		c2_port->rx_buf_size =
		    netdev->mtu + ETH_HLEN + sizeof(struct c2_rxp_hdr) +
		    NET_IP_ALIGN;
	else
		c2_port->rx_buf_size = sizeof(struct c2_rxp_hdr) + RX_BUF_SIZE;
}

/*
 * Allocate TX ring elements and chain them together.
 * One-to-one association of adapter descriptors with ring elements.
 */
static int c2_tx_ring_alloc(struct c2_ring *tx_ring, void *vaddr,
			    dma_addr_t base, void __iomem * mmio_txp_ring)
{
	struct c2_tx_desc *tx_desc;
	struct c2_txp_desc __iomem *txp_desc;
	struct c2_element *elem;
	int i;

	tx_ring->start = kmalloc(sizeof(*elem) * tx_ring->count, GFP_KERNEL);
	if (!tx_ring->start)
		return -ENOMEM;

	elem = tx_ring->start;
	tx_desc = vaddr;
	txp_desc = mmio_txp_ring;
	for (i = 0; i < tx_ring->count; i++, elem++, tx_desc++, txp_desc++) {
		tx_desc->len = 0;
		tx_desc->status = 0;

		/* Set TXP_HTXD_UNINIT */
		__raw_writeq(cpu_to_be64(0x1122334455667788ULL),
			     (void __iomem *) txp_desc + C2_TXP_ADDR);
		__raw_writew(0, (void __iomem *) txp_desc + C2_TXP_LEN);
		__raw_writew(cpu_to_be16(TXP_HTXD_UNINIT),
			     (void __iomem *) txp_desc + C2_TXP_FLAGS);

		elem->skb = NULL;
		elem->ht_desc = tx_desc;
		elem->hw_desc = txp_desc;

		if (i == tx_ring->count - 1) {
			elem->next = tx_ring->start;
			tx_desc->next_offset = base;
		} else {
			elem->next = elem + 1;
			tx_desc->next_offset =
			    base + (i + 1) * sizeof(*tx_desc);
		}
	}

	tx_ring->to_use = tx_ring->to_clean = tx_ring->start;

	return 0;
}

/*
 * Allocate RX ring elements and chain them together.
 * One-to-one association of adapter descriptors with ring elements.
 */
static int c2_rx_ring_alloc(struct c2_ring *rx_ring, void *vaddr,
			    dma_addr_t base, void __iomem * mmio_rxp_ring)
{
	struct c2_rx_desc *rx_desc;
	struct c2_rxp_desc __iomem *rxp_desc;
	struct c2_element *elem;
	int i;

	rx_ring->start = kmalloc(sizeof(*elem) * rx_ring->count, GFP_KERNEL);
	if (!rx_ring->start)
		return -ENOMEM;

	elem = rx_ring->start;
	rx_desc = vaddr;
	rxp_desc = mmio_rxp_ring;
	for (i = 0; i < rx_ring->count; i++, elem++, rx_desc++, rxp_desc++) {
		rx_desc->len = 0;
		rx_desc->status = 0;

		/* Set RXP_HRXD_UNINIT */
		__raw_writew(cpu_to_be16(RXP_HRXD_OK),
		       (void __iomem *) rxp_desc + C2_RXP_STATUS);
		__raw_writew(0, (void __iomem *) rxp_desc + C2_RXP_COUNT);
		__raw_writew(0, (void __iomem *) rxp_desc + C2_RXP_LEN);
		__raw_writeq(cpu_to_be64(0x99aabbccddeeffULL),
			     (void __iomem *) rxp_desc + C2_RXP_ADDR);
		__raw_writew(cpu_to_be16(RXP_HRXD_UNINIT),
			     (void __iomem *) rxp_desc + C2_RXP_FLAGS);

		elem->skb = NULL;
		elem->ht_desc = rx_desc;
		elem->hw_desc = rxp_desc;

		if (i == rx_ring->count - 1) {
			elem->next = rx_ring->start;
			rx_desc->next_offset = base;
		} else {
			elem->next = elem + 1;
			rx_desc->next_offset =
			    base + (i + 1) * sizeof(*rx_desc);
		}
	}

	rx_ring->to_use = rx_ring->to_clean = rx_ring->start;

	return 0;
}

/* Setup buffer for receiving */
static inline int c2_rx_alloc(struct c2_port *c2_port, struct c2_element *elem)
{
	struct c2_dev *c2dev = c2_port->c2dev;
	struct c2_rx_desc *rx_desc = elem->ht_desc;
	struct sk_buff *skb;
	dma_addr_t mapaddr;
	u32 maplen;
	struct c2_rxp_hdr *rxp_hdr;

	skb = dev_alloc_skb(c2_port->rx_buf_size);
	if (unlikely(!skb)) {
		pr_debug("%s: out of memory for receive\n",
			c2_port->netdev->name);
		return -ENOMEM;
	}

	/* Zero out the rxp hdr in the sk_buff */
	memset(skb->data, 0, sizeof(*rxp_hdr));

	skb->dev = c2_port->netdev;

	maplen = c2_port->rx_buf_size;
	mapaddr =
	    pci_map_single(c2dev->pcidev, skb->data, maplen,
			   PCI_DMA_FROMDEVICE);

	/* Set the sk_buff RXP_header to RXP_HRXD_READY */
	rxp_hdr = (struct c2_rxp_hdr *) skb->data;
	rxp_hdr->flags = RXP_HRXD_READY;

	__raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
	__raw_writew(cpu_to_be16((u16) maplen - sizeof(*rxp_hdr)),
		     elem->hw_desc + C2_RXP_LEN);
	__raw_writeq(cpu_to_be64(mapaddr), elem->hw_desc + C2_RXP_ADDR);
	__raw_writew(cpu_to_be16(RXP_HRXD_READY), elem->hw_desc + C2_RXP_FLAGS);

	elem->skb = skb;
	elem->mapaddr = mapaddr;
	elem->maplen = maplen;
	rx_desc->len = maplen;

	return 0;
}

/*
 * Allocate buffers for the Rx ring
 * For receive:  rx_ring.to_clean is next received frame
 */
static int c2_rx_fill(struct c2_port *c2_port)
{
	struct c2_ring *rx_ring = &c2_port->rx_ring;
	struct c2_element *elem;
	int ret = 0;

	elem = rx_ring->start;
	do {
		if (c2_rx_alloc(c2_port, elem)) {
			ret = 1;
			break;
		}
	} while ((elem = elem->next) != rx_ring->start);

	rx_ring->to_clean = rx_ring->start;
	return ret;
}

/* Free all buffers in RX ring, assumes receiver stopped */
static void c2_rx_clean(struct c2_port *c2_port)
{
	struct c2_dev *c2dev = c2_port->c2dev;
	struct c2_ring *rx_ring = &c2_port->rx_ring;
	struct c2_element *elem;
	struct c2_rx_desc *rx_desc;

	elem = rx_ring->start;
	do {
		rx_desc = elem->ht_desc;
		rx_desc->len = 0;

		__raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
		__raw_writew(0, elem->hw_desc + C2_RXP_COUNT);
		__raw_writew(0, elem->hw_desc + C2_RXP_LEN);
		__raw_writeq(cpu_to_be64(0x99aabbccddeeffULL),
			     elem->hw_desc + C2_RXP_ADDR);
		__raw_writew(cpu_to_be16(RXP_HRXD_UNINIT),
			     elem->hw_desc + C2_RXP_FLAGS);

		if (elem->skb) {
			pci_unmap_single(c2dev->pcidev, elem->mapaddr,
					 elem->maplen, PCI_DMA_FROMDEVICE);
			dev_kfree_skb(elem->skb);
			elem->skb = NULL;
		}
	} while ((elem = elem->next) != rx_ring->start);
}

static inline int c2_tx_free(struct c2_dev *c2dev, struct c2_element *elem)
{
	struct c2_tx_desc *tx_desc = elem->ht_desc;

	tx_desc->len = 0;

	pci_unmap_single(c2dev->pcidev, elem->mapaddr, elem->maplen,
			 PCI_DMA_TODEVICE);

	if (elem->skb) {
		dev_kfree_skb_any(elem->skb);
		elem->skb = NULL;
	}

	return 0;
}

/* Free all buffers in TX ring, assumes transmitter stopped */
static void c2_tx_clean(struct c2_port *c2_port)
{
	struct c2_ring *tx_ring = &c2_port->tx_ring;
	struct c2_element *elem;
	struct c2_txp_desc txp_htxd;
	int retry;
	unsigned long flags;

	spin_lock_irqsave(&c2_port->tx_lock, flags);

	elem = tx_ring->start;

	do {
		retry = 0;
		do {
			txp_htxd.flags =
			    readw(elem->hw_desc + C2_TXP_FLAGS);

			if (txp_htxd.flags == TXP_HTXD_READY) {
				retry = 1;
				__raw_writew(0,
					     elem->hw_desc + C2_TXP_LEN);
				__raw_writeq(0,
					     elem->hw_desc + C2_TXP_ADDR);
				__raw_writew(cpu_to_be16(TXP_HTXD_DONE),
					     elem->hw_desc + C2_TXP_FLAGS);
				c2_port->netstats.tx_dropped++;
				break;
			} else {
				__raw_writew(0,
					     elem->hw_desc + C2_TXP_LEN);
				__raw_writeq(cpu_to_be64(0x1122334455667788ULL),
					     elem->hw_desc + C2_TXP_ADDR);
				__raw_writew(cpu_to_be16(TXP_HTXD_UNINIT),
					     elem->hw_desc + C2_TXP_FLAGS);
			}

			c2_tx_free(c2_port->c2dev, elem);

		} while ((elem = elem->next) != tx_ring->start);
	} while (retry);

	c2_port->tx_avail = c2_port->tx_ring.count - 1;
	c2_port->c2dev->cur_tx = tx_ring->to_use - tx_ring->start;

	if (c2_port->tx_avail > MAX_SKB_FRAGS + 1)
		netif_wake_queue(c2_port->netdev);

	spin_unlock_irqrestore(&c2_port->tx_lock, flags);
}

/*
 * Process transmit descriptors marked 'DONE' by the firmware,
 * freeing up their unneeded sk_buffs.
 */
static void c2_tx_interrupt(struct net_device *netdev)
{
	struct c2_port *c2_port = netdev_priv(netdev);
	struct c2_dev *c2dev = c2_port->c2dev;
	struct c2_ring *tx_ring = &c2_port->tx_ring;
	struct c2_element *elem;
	struct c2_txp_desc txp_htxd;

	spin_lock(&c2_port->tx_lock);

	for (elem = tx_ring->to_clean; elem != tx_ring->to_use;
	     elem = elem->next) {
		txp_htxd.flags =
		    be16_to_cpu(readw(elem->hw_desc + C2_TXP_FLAGS));

		if (txp_htxd.flags != TXP_HTXD_DONE)
			break;

		if (netif_msg_tx_done(c2_port)) {
			/* PCI reads are expensive in fast path */
			txp_htxd.len =
			    be16_to_cpu(readw(elem->hw_desc + C2_TXP_LEN));
			pr_debug("%s: tx done slot %3Zu status 0x%x len "
				"%5u bytes\n",
				netdev->name, elem - tx_ring->start,
				txp_htxd.flags, txp_htxd.len);
		}

		c2_tx_free(c2dev, elem);
		++(c2_port->tx_avail);
	}

	tx_ring->to_clean = elem;

	if (netif_queue_stopped(netdev)
	    && c2_port->tx_avail > MAX_SKB_FRAGS + 1)
		netif_wake_queue(netdev);

	spin_unlock(&c2_port->tx_lock);
}

static void c2_rx_error(struct c2_port *c2_port, struct c2_element *elem)
{
	struct c2_rx_desc *rx_desc = elem->ht_desc;
	struct c2_rxp_hdr *rxp_hdr = (struct c2_rxp_hdr *) elem->skb->data;

	if (rxp_hdr->status != RXP_HRXD_OK ||
	    rxp_hdr->len > (rx_desc->len - sizeof(*rxp_hdr))) {
		pr_debug("BAD RXP_HRXD\n");
		pr_debug("  rx_desc : %p\n", rx_desc);
		pr_debug("    index : %Zu\n",
			elem - c2_port->rx_ring.start);
		pr_debug("    len   : %u\n", rx_desc->len);
		pr_debug("  rxp_hdr : %p [PA %p]\n", rxp_hdr,
			(void *) __pa((unsigned long) rxp_hdr));
		pr_debug("    flags : 0x%x\n", rxp_hdr->flags);
		pr_debug("    status: 0x%x\n", rxp_hdr->status);
		pr_debug("    len   : %u\n", rxp_hdr->len);
		pr_debug("    rsvd  : 0x%x\n", rxp_hdr->rsvd);
	}

	/* Setup the skb for reuse since we're dropping this pkt */
	elem->skb->tail = elem->skb->data = elem->skb->head;

	/* Zero out the rxp hdr in the sk_buff */
	memset(elem->skb->data, 0, sizeof(*rxp_hdr));

	/* Write the descriptor to the adapter's rx ring */
	__raw_writew(0, elem->hw_desc + C2_RXP_STATUS);
	__raw_writew(0, elem->hw_desc + C2_RXP_COUNT);
	__raw_writew(cpu_to_be16((u16) elem->maplen - sizeof(*rxp_hdr)),
		     elem->hw_desc + C2_RXP_LEN);
	__raw_writeq(cpu_to_be64(elem->mapaddr), elem->hw_desc + C2_RXP_ADDR);
	__raw_writew(cpu_to_be16(RXP_HRXD_READY), elem->hw_desc + C2_RXP_FLAGS);

	pr_debug("packet dropped\n");
	c2_port->netstats.rx_dropped++;
}

static void c2_rx_interrupt(struct net_device *netdev)
{
	struct c2_port *c2_port = netdev_priv(netdev);
	struct c2_dev *c2dev = c2_port->c2dev;
	struct c2_ring *rx_ring = &c2_port->rx_ring;
	struct c2_element *elem;
	struct c2_rx_desc *rx_desc;
	struct c2_rxp_hdr *rxp_hdr;
	struct sk_buff *skb;
	dma_addr_t mapaddr;
	u32 maplen, buflen;
	unsigned long flags;

	spin_lock_irqsave(&c2dev->lock, flags);

	/* Begin where we left off */
	rx_ring->to_clean = rx_ring->start + c2dev->cur_rx;

	for (elem = rx_ring->to_clean; elem->next != rx_ring->to_clean;
	     elem = elem->next) {
		rx_desc = elem->ht_desc;
		mapaddr = elem->mapaddr;
		maplen = elem->maplen;
		skb = elem->skb;
		rxp_hdr = (struct c2_rxp_hdr *) skb->data;

		if (rxp_hdr->flags != RXP_HRXD_DONE)
			break;
		buflen = rxp_hdr->len;

		/* Sanity check the RXP header */
		if (rxp_hdr->status != RXP_HRXD_OK ||
		    buflen > (rx_desc->len - sizeof(*rxp_hdr))) {
			c2_rx_error(c2_port, elem);
			continue;
		}

		/*
		 * Allocate and map a new skb for replenishing the host
		 * RX desc
		 */
		if (c2_rx_alloc(c2_port, elem)) {
			c2_rx_error(c2_port, elem);
			continue;
		}

		/* Unmap the old skb */
		pci_unmap_single(c2dev->pcidev, mapaddr, maplen,
				 PCI_DMA_FROMDEVICE);

		prefetch(skb->data);

		/*
		 * Skip past the leading 8 bytes comprising of the
		 * "struct c2_rxp_hdr", prepended by the adapter
		 * to the usual Ethernet header ("struct ethhdr"),
		 * to the start of the raw Ethernet packet.
		 *
		 * Fix up the various fields in the sk_buff before
		 * passing it up to netif_rx(). The transfer size
		 * (in bytes) specified by the adapter len field of
		 * the "struct rxp_hdr_t" does NOT include the
		 * "sizeof(struct c2_rxp_hdr)".
		 */
		skb->data += sizeof(*rxp_hdr);
		skb->tail = skb->data + buflen;
		skb->len = buflen;
		skb->dev = netdev;
		skb->protocol = eth_type_trans(skb, netdev);

		netif_rx(skb);

		netdev->last_rx = jiffies;
		c2_port->netstats.rx_packets++;
		c2_port->netstats.rx_bytes += buflen;
	}

	/* Save where we left off */
	rx_ring->to_clean = elem;
	c2dev->cur_rx = elem - rx_ring->start;
	C2_SET_CUR_RX(c2dev, c2dev->cur_rx);

	spin_unlock_irqrestore(&c2dev->lock, flags);
}

/*
 * Handle netisr0 TX & RX interrupts.
 */
static irqreturn_t c2_interrupt(int irq, void *dev_id)
{
	unsigned int netisr0, dmaisr;
	int handled = 0;
	struct c2_dev *c2dev = (struct c2_dev *) dev_id;

	/* Process CCILNET interrupts */
	netisr0 = readl(c2dev->regs + C2_NISR0);
	if (netisr0) {

		/*
		 * There is an issue with the firmware that always
		 * provides the status of RX for both TX & RX
		 * interrupts.  So process both queues here.
		 */
		c2_rx_interrupt(c2dev->netdev);
		c2_tx_interrupt(c2dev->netdev);

		/* Clear the interrupt */
		writel(netisr0, c2dev->regs + C2_NISR0);
		handled++;
	}

	/* Process RNIC interrupts */
	dmaisr = readl(c2dev->regs + C2_DISR);
	if (dmaisr) {
		writel(dmaisr, c2dev->regs + C2_DISR);
		c2_rnic_interrupt(c2dev);
		handled++;
	}

	if (handled) {
		return IRQ_HANDLED;
	} else {
		return IRQ_NONE;
	}
}

static int c2_up(struct net_device *netdev)
{
	struct c2_port *c2_port = netdev_priv(netdev);
	struct c2_dev *c2dev = c2_port->c2dev;
	struct c2_element *elem;
	struct c2_rxp_hdr *rxp_hdr;
	struct in_device *in_dev;
	size_t rx_size, tx_size;
	int ret, i;
	unsigned int netimr0;

	if (netif_msg_ifup(c2_port))
		pr_debug("%s: enabling interface\n", netdev->name);

	/* Set the Rx buffer size based on MTU */
	c2_set_rxbufsize(c2_port);

	/* Allocate DMA'able memory for Tx/Rx host descriptor rings */
	rx_size = c2_port->rx_ring.count * sizeof(struct c2_rx_desc);
	tx_size = c2_port->tx_ring.count * sizeof(struct c2_tx_desc);

	c2_port->mem_size = tx_size + rx_size;
	c2_port->mem = pci_alloc_consistent(c2dev->pcidev, c2_port->mem_size,
					    &c2_port->dma);
	if (c2_port->mem == NULL) {
		pr_debug("Unable to allocate memory for "
			"host descriptor rings\n");
		return -ENOMEM;
	}

	memset(c2_port->mem, 0, c2_port->mem_size);

	/* Create the Rx host descriptor ring */
	if ((ret =
	     c2_rx_ring_alloc(&c2_port->rx_ring, c2_port->mem, c2_port->dma,
			      c2dev->mmio_rxp_ring))) {
		pr_debug("Unable to create RX ring\n");
		goto bail0;
	}

	/* Allocate Rx buffers for the host descriptor ring */
	if (c2_rx_fill(c2_port)) {
		pr_debug("Unable to fill RX ring\n");
		goto bail1;
	}

	/* Create the Tx host descriptor ring */
	if ((ret = c2_tx_ring_alloc(&c2_port->tx_ring, c2_port->mem + rx_size,
				    c2_port->dma + rx_size,
				    c2dev->mmio_txp_ring))) {
		pr_debug("Unable to create TX ring\n");
		goto bail1;
	}

	/* Set the TX pointer to where we left off */
	c2_port->tx_avail = c2_port->tx_ring.count - 1;
	c2_port->tx_ring.to_use = c2_port->tx_ring.to_clean =
	    c2_port->tx_ring.start + c2dev->cur_tx;

	/* missing: Initialize MAC */

	BUG_ON(c2_port->tx_ring.to_use != c2_port->tx_ring.to_clean);

	/* Reset the adapter, ensures the driver is in sync with the RXP */
	c2_reset(c2_port);

	/* Reset the READY bit in the sk_buff RXP headers & adapter HRXDQ */
	for (i = 0, elem = c2_port->rx_ring.start; i < c2_port->rx_ring.count;
	     i++, elem++) {
		rxp_hdr = (struct c2_rxp_hdr *) elem->skb->data;
		rxp_hdr->flags = 0;
		__raw_writew(cpu_to_be16(RXP_HRXD_READY),
			     elem->hw_desc + C2_RXP_FLAGS);
	}

	/* Enable network packets */
	netif_start_queue(netdev);

	/* Enable IRQ */
	writel(0, c2dev->regs + C2_IDIS);
	netimr0 = readl(c2dev->regs + C2_NIMR0);
	netimr0 &= ~(C2_PCI_HTX_INT | C2_PCI_HRX_INT);
	writel(netimr0, c2dev->regs + C2_NIMR0);

	/* Tell the stack to ignore arp requests for ipaddrs bound to
	 * other interfaces.  This is needed to prevent the host stack
	 * from responding to arp requests to the ipaddr bound on the
	 * rdma interface.
	 */
	in_dev = in_dev_get(netdev);
	in_dev->cnf.arp_ignore = 1;
	in_dev_put(in_dev);

	return 0;

      bail1:
	c2_rx_clean(c2_port);
	kfree(c2_port->rx_ring.start);

      bail0:
	pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem,
			    c2_port->dma);

	return ret;
}

static int c2_down(struct net_device *netdev)
{
	struct c2_port *c2_port = netdev_priv(netdev);
	struct c2_dev *c2dev = c2_port->c2dev;

	if (netif_msg_ifdown(c2_port))
		pr_debug("%s: disabling interface\n",
			netdev->name);

	/* Wait for all the queued packets to get sent */
	c2_tx_interrupt(netdev);

	/* Disable network packets */
	netif_stop_queue(netdev);

	/* Disable IRQs by clearing the interrupt mask */
	writel(1, c2dev->regs + C2_IDIS);
	writel(0, c2dev->regs + C2_NIMR0);

	/* missing: Stop transmitter */

	/* missing: Stop receiver */

	/* Reset the adapter, ensures the driver is in sync with the RXP */
	c2_reset(c2_port);

	/* missing: Turn off LEDs here */

	/* Free all buffers in the host descriptor rings */
	c2_tx_clean(c2_port);
	c2_rx_clean(c2_port);

	/* Free the host descriptor rings */
	kfree(c2_port->rx_ring.start);
	kfree(c2_port->tx_ring.start);
	pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem,
			    c2_port->dma);

	return 0;
}

static void c2_reset(struct c2_port *c2_port)
{
	struct c2_dev *c2dev = c2_port->c2dev;
	unsigned int cur_rx = c2dev->cur_rx;

	/* Tell the hardware to quiesce */
	C2_SET_CUR_RX(c2dev, cur_rx | C2_PCI_HRX_QUI);

	/*
	 * The hardware will reset the C2_PCI_HRX_QUI bit once
	 * the RXP is quiesced.  Wait 2 seconds for this.
	 */
	ssleep(2);

	cur_rx = C2_GET_CUR_RX(c2dev);

	if (cur_rx & C2_PCI_HRX_QUI)
		pr_debug("c2_reset: failed to quiesce the hardware!\n");

	cur_rx &= ~C2_PCI_HRX_QUI;

	c2dev->cur_rx = cur_rx;

	pr_debug("Current RX: %u\n", c2dev->cur_rx);
}

static int c2_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
	struct c2_port *c2_port = netdev_priv(netdev);
	struct c2_dev *c2dev = c2_port->c2dev;
	struct c2_ring *tx_ring = &c2_port->tx_ring;
	struct c2_element *elem;
	dma_addr_t mapaddr;
	u32 maplen;
	unsigned long flags;
	unsigned int i;

	spin_lock_irqsave(&c2_port->tx_lock, flags);

	if (unlikely(c2_port->tx_avail < (skb_shinfo(skb)->nr_frags + 1))) {
		netif_stop_queue(netdev);
		spin_unlock_irqrestore(&c2_port->tx_lock, flags);

		pr_debug("%s: Tx ring full when queue awake!\n",
			netdev->name);
		return NETDEV_TX_BUSY;
	}

	maplen = skb_headlen(skb);
	mapaddr =
	    pci_map_single(c2dev->pcidev, skb->data, maplen, PCI_DMA_TODEVICE);

	elem = tx_ring->to_use;
	elem->skb = skb;
	elem->mapaddr = mapaddr;
	elem->maplen = maplen;

	/* Tell HW to xmit */
	__raw_writeq(cpu_to_be64(mapaddr), elem->hw_desc + C2_TXP_ADDR);
	__raw_writew(cpu_to_be16(maplen), elem->hw_desc + C2_TXP_LEN);
	__raw_writew(cpu_to_be16(TXP_HTXD_READY), elem->hw_desc + C2_TXP_FLAGS);

	c2_port->netstats.tx_packets++;
	c2_port->netstats.tx_bytes += maplen;

	/* Loop thru additional data fragments and queue them */
	if (skb_shinfo(skb)->nr_frags) {
		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
			maplen = frag->size;
			mapaddr =
			    pci_map_page(c2dev->pcidev, frag->page,
					 frag->page_offset, maplen,
					 PCI_DMA_TODEVICE);

			elem = elem->next;
			elem->skb = NULL;
			elem->mapaddr = mapaddr;
			elem->maplen = maplen;

			/* Tell HW to xmit */
			__raw_writeq(cpu_to_be64(mapaddr),
				     elem->hw_desc + C2_TXP_ADDR);
			__raw_writew(cpu_to_be16(maplen),
				     elem->hw_desc + C2_TXP_LEN);
			__raw_writew(cpu_to_be16(TXP_HTXD_READY),
				     elem->hw_desc + C2_TXP_FLAGS);

			c2_port->netstats.tx_packets++;
			c2_port->netstats.tx_bytes += maplen;
		}
	}

	tx_ring->to_use = elem->next;
	c2_port->tx_avail -= (skb_shinfo(skb)->nr_frags + 1);

	if (c2_port->tx_avail <= MAX_SKB_FRAGS + 1) {
		netif_stop_queue(netdev);
		if (netif_msg_tx_queued(c2_port))
			pr_debug("%s: transmit queue full\n",
				netdev->name);
	}

	spin_unlock_irqrestore(&c2_port->tx_lock, flags);

	netdev->trans_start = jiffies;

	return NETDEV_TX_OK;
}

static struct net_device_stats *c2_get_stats(struct net_device *netdev)
{
	struct c2_port *c2_port = netdev_priv(netdev);

	return &c2_port->netstats;
}

static void c2_tx_timeout(struct net_device *netdev)
{
	struct c2_port *c2_port = netdev_priv(netdev);

	if (netif_msg_timer(c2_port))
		pr_debug("%s: tx timeout\n", netdev->name);

	c2_tx_clean(c2_port);
}

static int c2_change_mtu(struct net_device *netdev, int new_mtu)
{
	int ret = 0;

	if (new_mtu < ETH_ZLEN || new_mtu > ETH_JUMBO_MTU)
		return -EINVAL;

	netdev->mtu = new_mtu;

	if (netif_running(netdev)) {
		c2_down(netdev);

		c2_up(netdev);
	}

	return ret;
}

/* Initialize network device */
static struct net_device *c2_devinit(struct c2_dev *c2dev,
				     void __iomem * mmio_addr)
{
	struct c2_port *c2_port = NULL;
	struct net_device *netdev = alloc_etherdev(sizeof(*c2_port));

	if (!netdev) {
		pr_debug("c2_port etherdev alloc failed");
		return NULL;
	}

	SET_MODULE_OWNER(netdev);
	SET_NETDEV_DEV(netdev, &c2dev->pcidev->dev);

	netdev->open = c2_up;
	netdev->stop = c2_down;
	netdev->hard_start_xmit = c2_xmit_frame;
	netdev->get_stats = c2_get_stats;
	netdev->tx_timeout = c2_tx_timeout;
	netdev->change_mtu = c2_change_mtu;
	netdev->watchdog_timeo = C2_TX_TIMEOUT;
	netdev->irq = c2dev->pcidev->irq;

	c2_port = netdev_priv(netdev);
	c2_port->netdev = netdev;
	c2_port->c2dev = c2dev;
	c2_port->msg_enable = netif_msg_init(debug, default_msg);
	c2_port->tx_ring.count = C2_NUM_TX_DESC;
	c2_port->rx_ring.count = C2_NUM_RX_DESC;

	spin_lock_init(&c2_port->tx_lock);

	/* Copy our 48-bit ethernet hardware address */
	memcpy_fromio(netdev->dev_addr, mmio_addr + C2_REGS_ENADDR, 6);

	/* Validate the MAC address */
	if (!is_valid_ether_addr(netdev->dev_addr)) {
		pr_debug("Invalid MAC Address\n");
		c2_print_macaddr(netdev);
		free_netdev(netdev);
		return NULL;
	}

	c2dev->netdev = netdev;

	return netdev;
}

static int __devinit c2_probe(struct pci_dev *pcidev,
			      const struct pci_device_id *ent)
{
	int ret = 0, i;
	unsigned long reg0_start, reg0_flags, reg0_len;
	unsigned long reg2_start, reg2_flags, reg2_len;
	unsigned long reg4_start, reg4_flags, reg4_len;
	unsigned kva_map_size;
	struct net_device *netdev = NULL;
	struct c2_dev *c2dev = NULL;
	void __iomem *mmio_regs = NULL;

	printk(KERN_INFO PFX "AMSO1100 Gigabit Ethernet driver v%s loaded\n",
		DRV_VERSION);

	/* Enable PCI device */
	ret = pci_enable_device(pcidev);
	if (ret) {
		printk(KERN_ERR PFX "%s: Unable to enable PCI device\n",
			pci_name(pcidev));
		goto bail0;
	}

	reg0_start = pci_resource_start(pcidev, BAR_0);
	reg0_len = pci_resource_len(pcidev, BAR_0);
	reg0_flags = pci_resource_flags(pcidev, BAR_0);

	reg2_start = pci_resource_start(pcidev, BAR_2);
	reg2_len = pci_resource_len(pcidev, BAR_2);
	reg2_flags = pci_resource_flags(pcidev, BAR_2);

	reg4_start = pci_resource_start(pcidev, BAR_4);
	reg4_len = pci_resource_len(pcidev, BAR_4);
	reg4_flags = pci_resource_flags(pcidev, BAR_4);

	pr_debug("BAR0 size = 0x%lX bytes\n", reg0_len);
	pr_debug("BAR2 size = 0x%lX bytes\n", reg2_len);
	pr_debug("BAR4 size = 0x%lX bytes\n", reg4_len);

	/* Make sure PCI base addr are MMIO */
	if (!(reg0_flags & IORESOURCE_MEM) ||
	    !(reg2_flags & IORESOURCE_MEM) || !(reg4_flags & IORESOURCE_MEM)) {
		printk(KERN_ERR PFX "PCI regions not an MMIO resource\n");
		ret = -ENODEV;
		goto bail1;
	}

	/* Check for weird/broken PCI region reporting */
	if ((reg0_len < C2_REG0_SIZE) ||
	    (reg2_len < C2_REG2_SIZE) || (reg4_len < C2_REG4_SIZE)) {
		printk(KERN_ERR PFX "Invalid PCI region sizes\n");
		ret = -ENODEV;
		goto bail1;
	}

	/* Reserve PCI I/O and memory resources */
	ret = pci_request_regions(pcidev, DRV_NAME);
	if (ret) {
		printk(KERN_ERR PFX "%s: Unable to request regions\n",
			pci_name(pcidev));
		goto bail1;
	}

	if ((sizeof(dma_addr_t) > 4)) {
		ret = pci_set_dma_mask(pcidev, DMA_64BIT_MASK);
		if (ret < 0) {
			printk(KERN_ERR PFX "64b DMA configuration failed\n");
			goto bail2;
		}
	} else {
		ret = pci_set_dma_mask(pcidev, DMA_32BIT_MASK);
		if (ret < 0) {
			printk(KERN_ERR PFX "32b DMA configuration failed\n");
			goto bail2;
		}
	}

	/* Enables bus-mastering on the device */
	pci_set_master(pcidev);

	/* Remap the adapter PCI registers in BAR4 */
	mmio_regs = ioremap_nocache(reg4_start + C2_PCI_REGS_OFFSET,
				    sizeof(struct c2_adapter_pci_regs));
	if (mmio_regs == 0UL) {
		printk(KERN_ERR PFX
			"Unable to remap adapter PCI registers in BAR4\n");
		ret = -EIO;
		goto bail2;
	}

	/* Validate PCI regs magic */
	for (i = 0; i < sizeof(c2_magic); i++) {
		if (c2_magic[i] != readb(mmio_regs + C2_REGS_MAGIC + i)) {
			printk(KERN_ERR PFX "Downlevel Firmware boot loader "
				"[%d/%Zd: got 0x%x, exp 0x%x]. Use the cc_flash "
			       "utility to update your boot loader\n",
				i + 1, sizeof(c2_magic),
				readb(mmio_regs + C2_REGS_MAGIC + i),
				c2_magic[i]);
			printk(KERN_ERR PFX "Adapter not claimed\n");
			iounmap(mmio_regs);
			ret = -EIO;
			goto bail2;
		}
	}

	/* Validate the adapter version */
	if (be32_to_cpu(readl(mmio_regs + C2_REGS_VERS)) != C2_VERSION) {
		printk(KERN_ERR PFX "Version mismatch "
			"[fw=%u, c2=%u], Adapter not claimed\n",
			be32_to_cpu(readl(mmio_regs + C2_REGS_VERS)),
			C2_VERSION);
		ret = -EINVAL;
		iounmap(mmio_regs);
		goto bail2;
	}

	/* Validate the adapter IVN */
	if (be32_to_cpu(readl(mmio_regs + C2_REGS_IVN)) != C2_IVN) {
		printk(KERN_ERR PFX "Downlevel FIrmware level. You should be using "
		       "the OpenIB device support kit. "
		       "[fw=0x%x, c2=0x%x], Adapter not claimed\n",
			be32_to_cpu(readl(mmio_regs + C2_REGS_IVN)),
			C2_IVN);
		ret = -EINVAL;
		iounmap(mmio_regs);
		goto bail2;
	}

	/* Allocate hardware structure */
	c2dev = (struct c2_dev *) ib_alloc_device(sizeof(*c2dev));
	if (!c2dev) {
		printk(KERN_ERR PFX "%s: Unable to alloc hardware struct\n",
			pci_name(pcidev));
		ret = -ENOMEM;
		iounmap(mmio_regs);
		goto bail2;
	}

	memset(c2dev, 0, sizeof(*c2dev));
	spin_lock_init(&c2dev->lock);
	c2dev->pcidev = pcidev;
	c2dev->cur_tx = 0;

	/* Get the last RX index */
	c2dev->cur_rx =
	    (be32_to_cpu(readl(mmio_regs + C2_REGS_HRX_CUR)) -
	     0xffffc000) / sizeof(struct c2_rxp_desc);

	/* Request an interrupt line for the driver */
	ret = request_irq(pcidev->irq, c2_interrupt, SA_SHIRQ, DRV_NAME, c2dev);
	if (ret) {
		printk(KERN_ERR PFX "%s: requested IRQ %u is busy\n",
			pci_name(pcidev), pcidev->irq);
		iounmap(mmio_regs);
		goto bail3;
	}

	/* Set driver specific data */
	pci_set_drvdata(pcidev, c2dev);

	/* Initialize network device */
	if ((netdev = c2_devinit(c2dev, mmio_regs)) == NULL) {
		iounmap(mmio_regs);
		goto bail4;
	}

	/* Save off the actual size prior to unmapping mmio_regs */
	kva_map_size = be32_to_cpu(readl(mmio_regs + C2_REGS_PCI_WINSIZE));

	/* Unmap the adapter PCI registers in BAR4 */
	iounmap(mmio_regs);

	/* Register network device */
	ret = register_netdev(netdev);
	if (ret) {
		printk(KERN_ERR PFX "Unable to register netdev, ret = %d\n",
			ret);
		goto bail5;
	}

	/* Disable network packets */
	netif_stop_queue(netdev);

	/* Remap the adapter HRXDQ PA space to kernel VA space */
	c2dev->mmio_rxp_ring = ioremap_nocache(reg4_start + C2_RXP_HRXDQ_OFFSET,
					       C2_RXP_HRXDQ_SIZE);
	if (c2dev->mmio_rxp_ring == 0UL) {
		printk(KERN_ERR PFX "Unable to remap MMIO HRXDQ region\n");
		ret = -EIO;
		goto bail6;
	}

	/* Remap the adapter HTXDQ PA space to kernel VA space */
	c2dev->mmio_txp_ring = ioremap_nocache(reg4_start + C2_TXP_HTXDQ_OFFSET,
					       C2_TXP_HTXDQ_SIZE);
	if (c2dev->mmio_txp_ring == 0UL) {
		printk(KERN_ERR PFX "Unable to remap MMIO HTXDQ region\n");
		ret = -EIO;
		goto bail7;
	}

	/* Save off the current RX index in the last 4 bytes of the TXP Ring */
	C2_SET_CUR_RX(c2dev, c2dev->cur_rx);

	/* Remap the PCI registers in adapter BAR0 to kernel VA space */
	c2dev->regs = ioremap_nocache(reg0_start, reg0_len);
	if (c2dev->regs == 0UL) {
		printk(KERN_ERR PFX "Unable to remap BAR0\n");
		ret = -EIO;
		goto bail8;
	}

	/* Remap the PCI registers in adapter BAR4 to kernel VA space */
	c2dev->pa = reg4_start + C2_PCI_REGS_OFFSET;
	c2dev->kva = ioremap_nocache(reg4_start + C2_PCI_REGS_OFFSET,
				     kva_map_size);
	if (c2dev->kva == 0UL) {
		printk(KERN_ERR PFX "Unable to remap BAR4\n");
		ret = -EIO;
		goto bail9;
	}

	/* Print out the MAC address */
	c2_print_macaddr(netdev);

	ret = c2_rnic_init(c2dev);
	if (ret) {
		printk(KERN_ERR PFX "c2_rnic_init failed: %d\n", ret);
		goto bail10;
	}

	c2_register_device(c2dev);

	return 0;

 bail10:
	iounmap(c2dev->kva);

 bail9:
	iounmap(c2dev->regs);

 bail8:
	iounmap(c2dev->mmio_txp_ring);

 bail7:
	iounmap(c2dev->mmio_rxp_ring);

 bail6:
	unregister_netdev(netdev);

 bail5:
	free_netdev(netdev);

 bail4:
	free_irq(pcidev->irq, c2dev);

 bail3:
	ib_dealloc_device(&c2dev->ibdev);

 bail2:
	pci_release_regions(pcidev);

 bail1:
	pci_disable_device(pcidev);

 bail0:
	return ret;
}

static void __devexit c2_remove(struct pci_dev *pcidev)
{
	struct c2_dev *c2dev = pci_get_drvdata(pcidev);
	struct net_device *netdev = c2dev->netdev;

	/* Unregister with OpenIB */
	c2_unregister_device(c2dev);

	/* Clean up the RNIC resources */
	c2_rnic_term(c2dev);

	/* Remove network device from the kernel */
	unregister_netdev(netdev);

	/* Free network device */
	free_netdev(netdev);

	/* Free the interrupt line */
	free_irq(pcidev->irq, c2dev);

	/* missing: Turn LEDs off here */

	/* Unmap adapter PA space */
	iounmap(c2dev->kva);
	iounmap(c2dev->regs);
	iounmap(c2dev->mmio_txp_ring);
	iounmap(c2dev->mmio_rxp_ring);

	/* Free the hardware structure */
	ib_dealloc_device(&c2dev->ibdev);

	/* Release reserved PCI I/O and memory resources */
	pci_release_regions(pcidev);

	/* Disable PCI device */
	pci_disable_device(pcidev);

	/* Clear driver specific data */
	pci_set_drvdata(pcidev, NULL);
}

static struct pci_driver c2_pci_driver = {
	.name = DRV_NAME,
	.id_table = c2_pci_table,
	.probe = c2_probe,
	.remove = __devexit_p(c2_remove),
};

static int __init c2_init_module(void)
{
	return pci_module_init(&c2_pci_driver);
}

static void __exit c2_exit_module(void)
{
	pci_unregister_driver(&c2_pci_driver);
}

module_init(c2_init_module);
module_exit(c2_exit_module);