aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/netxen/netxen_nic_main.c
blob: 1b165a8c74f3a6a72b9d6979e9732eb4d13cd40f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
/*
 * Copyright (C) 2003 - 2006 NetXen, Inc.
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 *
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.
 *
 * Contact Information:
 *    info@netxen.com
 * NetXen,
 * 3965 Freedom Circle, Fourth floor,
 * Santa Clara, CA 95054
 *
 *
 *  Main source file for NetXen NIC Driver on Linux
 *
 */

#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include "netxen_nic_hw.h"

#include "netxen_nic.h"
#include "netxen_nic_phan_reg.h"

#include <linux/dma-mapping.h>
#include <net/ip.h>

MODULE_DESCRIPTION("NetXen Multi port (1/10) Gigabit Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(NETXEN_NIC_LINUX_VERSIONID);

char netxen_nic_driver_name[] = "netxen_nic";
static char netxen_nic_driver_string[] = "NetXen Network Driver version "
    NETXEN_NIC_LINUX_VERSIONID;

#define NETXEN_NETDEV_WEIGHT 120
#define NETXEN_ADAPTER_UP_MAGIC 777
#define NETXEN_NIC_PEG_TUNE 0

#define DMA_32BIT_MASK	0x00000000ffffffffULL
#define DMA_35BIT_MASK	0x00000007ffffffffULL

/* Local functions to NetXen NIC driver */
static int __devinit netxen_nic_probe(struct pci_dev *pdev,
				      const struct pci_device_id *ent);
static void __devexit netxen_nic_remove(struct pci_dev *pdev);
static int netxen_nic_open(struct net_device *netdev);
static int netxen_nic_close(struct net_device *netdev);
static int netxen_nic_xmit_frame(struct sk_buff *, struct net_device *);
static void netxen_tx_timeout(struct net_device *netdev);
static void netxen_tx_timeout_task(struct work_struct *work);
static void netxen_watchdog(unsigned long);
static int netxen_handle_int(struct netxen_adapter *, struct net_device *);
static int netxen_nic_poll(struct napi_struct *napi, int budget);
#ifdef CONFIG_NET_POLL_CONTROLLER
static void netxen_nic_poll_controller(struct net_device *netdev);
#endif
static irqreturn_t netxen_intr(int irq, void *data);

int physical_port[] = {0, 1, 2, 3};

/*  PCI Device ID Table  */
static struct pci_device_id netxen_pci_tbl[] __devinitdata = {
	{PCI_DEVICE(0x4040, 0x0001)},
	{PCI_DEVICE(0x4040, 0x0002)},
	{PCI_DEVICE(0x4040, 0x0003)},
	{PCI_DEVICE(0x4040, 0x0004)},
	{PCI_DEVICE(0x4040, 0x0005)},
	{PCI_DEVICE(0x4040, 0x0024)},
	{PCI_DEVICE(0x4040, 0x0025)},
	{0,}
};

MODULE_DEVICE_TABLE(pci, netxen_pci_tbl);

struct workqueue_struct *netxen_workq;
static void netxen_watchdog(unsigned long);

static inline void netxen_nic_update_cmd_producer(struct netxen_adapter *adapter,
							uint32_t crb_producer)
{
	switch (adapter->portnum) {
		case 0:
			writel(crb_producer, NETXEN_CRB_NORMALIZE
					(adapter, CRB_CMD_PRODUCER_OFFSET));
			return;
		case 1:
			writel(crb_producer, NETXEN_CRB_NORMALIZE
					(adapter, CRB_CMD_PRODUCER_OFFSET_1));
			return;
		case 2:
			writel(crb_producer, NETXEN_CRB_NORMALIZE
					(adapter, CRB_CMD_PRODUCER_OFFSET_2));
			return;
		case 3:
			writel(crb_producer, NETXEN_CRB_NORMALIZE
					(adapter, CRB_CMD_PRODUCER_OFFSET_3));
			return;
		default:
			printk(KERN_WARNING "We tried to update "
					"CRB_CMD_PRODUCER_OFFSET for invalid "
					"PCI function id %d\n",
					adapter->portnum);
			return;
	}
}

static inline void netxen_nic_update_cmd_consumer(struct netxen_adapter *adapter,
							u32 crb_consumer)
{
	switch (adapter->portnum) {
		case 0:
			writel(crb_consumer, NETXEN_CRB_NORMALIZE
				(adapter, CRB_CMD_CONSUMER_OFFSET));
			return;
		case 1:
			writel(crb_consumer, NETXEN_CRB_NORMALIZE
				(adapter, CRB_CMD_CONSUMER_OFFSET_1));
			return;
		case 2:
			writel(crb_consumer, NETXEN_CRB_NORMALIZE
				(adapter, CRB_CMD_CONSUMER_OFFSET_2));
			return;
		case 3:
			writel(crb_consumer, NETXEN_CRB_NORMALIZE
				(adapter, CRB_CMD_CONSUMER_OFFSET_3));
			return;
		default:
			printk(KERN_WARNING "We tried to update "
					"CRB_CMD_PRODUCER_OFFSET for invalid "
					"PCI function id %d\n",
					adapter->portnum);
			return;
	}
}

#define	ADAPTER_LIST_SIZE 12
int netxen_cards_found;

static void netxen_nic_disable_int(struct netxen_adapter *adapter)
{
	uint32_t	mask = 0x7ff;
	int retries = 32;

	DPRINTK(1, INFO, "Entered ISR Disable \n");

	switch (adapter->portnum) {
	case 0:
		writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_0));
		break;
	case 1:
		writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_1));
		break;
	case 2:
		writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_2));
		break;
	case 3:
		writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_3));
		break;
	}

	if (adapter->intr_scheme != -1 &&
	    adapter->intr_scheme != INTR_SCHEME_PERPORT)
		writel(mask,PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK));

	/* Window = 0 or 1 */
	if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
		do {
			writel(0xffffffff,
			       PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_TARGET_STATUS));
			mask = readl(pci_base_offset(adapter, ISR_INT_VECTOR));
			if (!(mask & 0x80))
				break;
			udelay(10);
		} while (--retries);

		if (!retries) {
			printk(KERN_NOTICE "%s: Failed to disable interrupt completely\n",
					netxen_nic_driver_name);
		}
	}

	DPRINTK(1, INFO, "Done with Disable Int\n");
}

static void netxen_nic_enable_int(struct netxen_adapter *adapter)
{
	u32 mask;

	DPRINTK(1, INFO, "Entered ISR Enable \n");

	if (adapter->intr_scheme != -1 &&
		adapter->intr_scheme != INTR_SCHEME_PERPORT) {
		switch (adapter->ahw.board_type) {
		case NETXEN_NIC_GBE:
			mask  =  0x77b;
			break;
		case NETXEN_NIC_XGBE:
			mask  =  0x77f;
			break;
		default:
			mask  =  0x7ff;
			break;
		}

		writel(mask, PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK));
	}

	switch (adapter->portnum) {
	case 0:
		writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_0));
		break;
	case 1:
		writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_1));
		break;
	case 2:
		writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_2));
		break;
	case 3:
		writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_3));
		break;
	}

	if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
		mask = 0xbff;
		if (adapter->intr_scheme != -1 &&
			adapter->intr_scheme != INTR_SCHEME_PERPORT) {
			writel(0X0, NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
		}
		writel(mask,
		       PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_TARGET_MASK));
	}

	DPRINTK(1, INFO, "Done with enable Int\n");
}

/*
 * netxen_nic_probe()
 *
 * The Linux system will invoke this after identifying the vendor ID and
 * device Id in the pci_tbl supported by this module.
 *
 * A quad port card has one operational PCI config space, (function 0),
 * which is used to access all four ports.
 *
 * This routine will initialize the adapter, and setup the global parameters
 * along with the port's specific structure.
 */
static int __devinit
netxen_nic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct net_device *netdev = NULL;
	struct netxen_adapter *adapter = NULL;
	void __iomem *mem_ptr0 = NULL;
	void __iomem *mem_ptr1 = NULL;
	void __iomem *mem_ptr2 = NULL;
	unsigned long first_page_group_end;
	unsigned long first_page_group_start;


	u8 __iomem *db_ptr = NULL;
	unsigned long mem_base, mem_len, db_base, db_len;
	int pci_using_dac, i = 0, err;
	int ring;
	struct netxen_recv_context *recv_ctx = NULL;
	struct netxen_rcv_desc_ctx *rcv_desc = NULL;
	struct netxen_cmd_buffer *cmd_buf_arr = NULL;
	u64 mac_addr[FLASH_NUM_PORTS + 1];
	int valid_mac = 0;
	u32 val;
	int pci_func_id = PCI_FUNC(pdev->devfn);

	printk(KERN_INFO "%s \n", netxen_nic_driver_string);

	if (pdev->class != 0x020000) {
		printk(KERN_ERR"NetXen function %d, class %x will not"
				"be enabled.\n",pci_func_id, pdev->class);
		return -ENODEV;
	}
	if ((err = pci_enable_device(pdev)))
		return err;
	if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
		err = -ENODEV;
		goto err_out_disable_pdev;
	}

	if ((err = pci_request_regions(pdev, netxen_nic_driver_name)))
		goto err_out_disable_pdev;

	pci_set_master(pdev);
	if (pdev->revision == NX_P2_C1 &&
	    (pci_set_dma_mask(pdev, DMA_35BIT_MASK) == 0) &&
	    (pci_set_consistent_dma_mask(pdev, DMA_35BIT_MASK) == 0)) {
		pci_using_dac = 1;
	} else {
		if ((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
		    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK)))
			goto err_out_free_res;

		pci_using_dac = 0;
	}


	netdev = alloc_etherdev(sizeof(struct netxen_adapter));
	if(!netdev) {
		printk(KERN_ERR"%s: Failed to allocate memory for the "
				"device block.Check system memory resource"
				" usage.\n", netxen_nic_driver_name);
		goto err_out_free_res;
	}

	SET_NETDEV_DEV(netdev, &pdev->dev);

	adapter = netdev->priv;

	adapter->ahw.pdev = pdev;
	adapter->ahw.pci_func  = pci_func_id;
	spin_lock_init(&adapter->tx_lock);

	/* remap phys address */
	mem_base = pci_resource_start(pdev, 0);	/* 0 is for BAR 0 */
	mem_len = pci_resource_len(pdev, 0);

	/* 128 Meg of memory */
	if (mem_len == NETXEN_PCI_128MB_SIZE) {
		mem_ptr0 = ioremap(mem_base, FIRST_PAGE_GROUP_SIZE);
		mem_ptr1 = ioremap(mem_base + SECOND_PAGE_GROUP_START,
				SECOND_PAGE_GROUP_SIZE);
		mem_ptr2 = ioremap(mem_base + THIRD_PAGE_GROUP_START,
				THIRD_PAGE_GROUP_SIZE);
		first_page_group_start = FIRST_PAGE_GROUP_START;
		first_page_group_end   = FIRST_PAGE_GROUP_END;
	} else if (mem_len == NETXEN_PCI_32MB_SIZE) {
		mem_ptr1 = ioremap(mem_base, SECOND_PAGE_GROUP_SIZE);
		mem_ptr2 = ioremap(mem_base + THIRD_PAGE_GROUP_START -
			SECOND_PAGE_GROUP_START, THIRD_PAGE_GROUP_SIZE);
		first_page_group_start = 0;
		first_page_group_end   = 0;
	} else {
		err = -EIO; 
		goto err_out_free_netdev;
	}

	if (((mem_ptr0 == 0UL) && (mem_len == NETXEN_PCI_128MB_SIZE)) ||
			(mem_ptr1 == 0UL) || (mem_ptr2 == 0UL)) {
		DPRINTK(ERR,
			"Cannot remap adapter memory aborting.:"
			"0 -> %p, 1 -> %p, 2 -> %p\n",
			mem_ptr0, mem_ptr1, mem_ptr2);

		err = -EIO;
		goto err_out_iounmap;
	}
	db_base = pci_resource_start(pdev, 4);	/* doorbell is on bar 4 */
	db_len = pci_resource_len(pdev, 4);

	if (db_len == 0) {
		printk(KERN_ERR "%s: doorbell is disabled\n",
		       netxen_nic_driver_name);
		err = -EIO;
		goto err_out_iounmap;
	}
	DPRINTK(INFO, "doorbell ioremap from %lx a size of %lx\n", db_base,
		db_len);

	db_ptr = ioremap(db_base, NETXEN_DB_MAPSIZE_BYTES);
	if (!db_ptr) {
		printk(KERN_ERR "%s: Failed to allocate doorbell map.",
		       netxen_nic_driver_name);
		err = -EIO;
		goto err_out_iounmap;
	}
	DPRINTK(INFO, "doorbell ioremaped at %p\n", db_ptr);

	adapter->ahw.pci_base0 = mem_ptr0;
	adapter->ahw.first_page_group_start = first_page_group_start;
	adapter->ahw.first_page_group_end   = first_page_group_end;
	adapter->ahw.pci_base1 = mem_ptr1;
	adapter->ahw.pci_base2 = mem_ptr2;
	adapter->ahw.db_base = db_ptr;
	adapter->ahw.db_len = db_len;

	adapter->netdev  = netdev;
	adapter->pdev    = pdev;

	netif_napi_add(netdev, &adapter->napi,
		       netxen_nic_poll, NETXEN_NETDEV_WEIGHT);

	/* this will be read from FW later */
	adapter->intr_scheme = -1;

	/* This will be reset for mezz cards  */
	adapter->portnum = pci_func_id;
	adapter->status   &= ~NETXEN_NETDEV_STATUS;

	netdev->open		   = netxen_nic_open;
	netdev->stop		   = netxen_nic_close;
	netdev->hard_start_xmit    = netxen_nic_xmit_frame;
	netdev->get_stats	   = netxen_nic_get_stats;	
	netdev->set_multicast_list = netxen_nic_set_multi;
	netdev->set_mac_address    = netxen_nic_set_mac;
	netdev->change_mtu	   = netxen_nic_change_mtu;
	netdev->tx_timeout	   = netxen_tx_timeout;
	netdev->watchdog_timeo     = HZ;

	netxen_nic_change_mtu(netdev, netdev->mtu);

	SET_ETHTOOL_OPS(netdev, &netxen_nic_ethtool_ops);
#ifdef CONFIG_NET_POLL_CONTROLLER
	netdev->poll_controller = netxen_nic_poll_controller;
#endif
	/* ScatterGather support */
	netdev->features = NETIF_F_SG;
	netdev->features |= NETIF_F_IP_CSUM;
	netdev->features |= NETIF_F_TSO;

	if (pci_using_dac)
		netdev->features |= NETIF_F_HIGHDMA;

	if (pci_enable_msi(pdev))
		adapter->flags &= ~NETXEN_NIC_MSI_ENABLED;
	else
		adapter->flags |= NETXEN_NIC_MSI_ENABLED;

	netdev->irq = pdev->irq;
	INIT_WORK(&adapter->tx_timeout_task, netxen_tx_timeout_task);

	/*
	 * Set the CRB window to invalid. If any register in window 0 is
	 * accessed it should set the window to 0 and then reset it to 1.
	 */
	adapter->curr_window = 255;

	/* initialize the adapter */
	netxen_initialize_adapter_hw(adapter);

	/*
	 *  Adapter in our case is quad port so initialize it before
	 *  initializing the ports
	 */

	netxen_initialize_adapter_ops(adapter);

	adapter->max_tx_desc_count = MAX_CMD_DESCRIPTORS_HOST;
	if ((adapter->ahw.boardcfg.board_type == NETXEN_BRDTYPE_P2_SB35_4G) ||
			(adapter->ahw.boardcfg.board_type == 
			 NETXEN_BRDTYPE_P2_SB31_2G)) 
		adapter->max_rx_desc_count = MAX_RCV_DESCRIPTORS_1G;
	else
		adapter->max_rx_desc_count = MAX_RCV_DESCRIPTORS;
	adapter->max_jumbo_rx_desc_count = MAX_JUMBO_RCV_DESCRIPTORS;
	adapter->max_lro_rx_desc_count = MAX_LRO_RCV_DESCRIPTORS;

	cmd_buf_arr = (struct netxen_cmd_buffer *)vmalloc(TX_RINGSIZE);
	if (cmd_buf_arr == NULL) {
		printk(KERN_ERR
		       "%s: Could not allocate cmd_buf_arr memory:%d\n",
		       netxen_nic_driver_name, (int)TX_RINGSIZE);
		err = -ENOMEM;
		goto err_out_free_adapter;
	}
	memset(cmd_buf_arr, 0, TX_RINGSIZE);
	adapter->cmd_buf_arr = cmd_buf_arr;

	for (i = 0; i < MAX_RCV_CTX; ++i) {
		recv_ctx = &adapter->recv_ctx[i];
		for (ring = 0; ring < NUM_RCV_DESC_RINGS; ring++) {
			rcv_desc = &recv_ctx->rcv_desc[ring];
			switch (RCV_DESC_TYPE(ring)) {
			case RCV_DESC_NORMAL:
				rcv_desc->max_rx_desc_count =
				    adapter->max_rx_desc_count;
				rcv_desc->flags = RCV_DESC_NORMAL;
				rcv_desc->dma_size = RX_DMA_MAP_LEN;
				rcv_desc->skb_size = MAX_RX_BUFFER_LENGTH;
				break;

			case RCV_DESC_JUMBO:
				rcv_desc->max_rx_desc_count =
				    adapter->max_jumbo_rx_desc_count;
				rcv_desc->flags = RCV_DESC_JUMBO;
				rcv_desc->dma_size = RX_JUMBO_DMA_MAP_LEN;
				rcv_desc->skb_size = MAX_RX_JUMBO_BUFFER_LENGTH;
				break;

			case RCV_RING_LRO:
				rcv_desc->max_rx_desc_count =
				    adapter->max_lro_rx_desc_count;
				rcv_desc->flags = RCV_DESC_LRO;
				rcv_desc->dma_size = RX_LRO_DMA_MAP_LEN;
				rcv_desc->skb_size = MAX_RX_LRO_BUFFER_LENGTH;
				break;

			}
			rcv_desc->rx_buf_arr = (struct netxen_rx_buffer *)
			    vmalloc(RCV_BUFFSIZE);

			if (rcv_desc->rx_buf_arr == NULL) {
				printk(KERN_ERR "%s: Could not allocate"
				       "rcv_desc->rx_buf_arr memory:%d\n",
				       netxen_nic_driver_name,
				       (int)RCV_BUFFSIZE);
				err = -ENOMEM;
				goto err_out_free_rx_buffer;
			}
			memset(rcv_desc->rx_buf_arr, 0, RCV_BUFFSIZE);
		}

	}

	netxen_initialize_adapter_sw(adapter);	/* initialize the buffers in adapter */

	/* Mezz cards have PCI function 0,2,3 enabled */
	if ((adapter->ahw.boardcfg.board_type == NETXEN_BRDTYPE_P2_SB31_10G_IMEZ)
		&& (pci_func_id >= 2))
			adapter->portnum = pci_func_id - 2;

#ifdef CONFIG_IA64
	if(adapter->portnum == 0) {
		netxen_pinit_from_rom(adapter, 0);
		udelay(500);
		netxen_load_firmware(adapter);
	}
#endif

	init_timer(&adapter->watchdog_timer);
	adapter->ahw.xg_linkup = 0;
	adapter->watchdog_timer.function = &netxen_watchdog;
	adapter->watchdog_timer.data = (unsigned long)adapter;
	INIT_WORK(&adapter->watchdog_task, netxen_watchdog_task);
	adapter->ahw.pdev = pdev;
	adapter->proc_cmd_buf_counter = 0;
	adapter->ahw.revision_id = pdev->revision;

	/* make sure Window == 1 */
	netxen_nic_pci_change_crbwindow(adapter, 1);

	netxen_nic_update_cmd_producer(adapter, 0);
	netxen_nic_update_cmd_consumer(adapter, 0);
	writel(0, NETXEN_CRB_NORMALIZE(adapter, CRB_HOST_CMD_ADDR_LO));

	if (netxen_is_flash_supported(adapter) == 0 &&
	    netxen_get_flash_mac_addr(adapter, mac_addr) == 0)
		valid_mac = 1;
	else
		valid_mac = 0;

	if (valid_mac) {
		unsigned char *p = (unsigned char *)&mac_addr[adapter->portnum];
		netdev->dev_addr[0] = *(p + 5);
		netdev->dev_addr[1] = *(p + 4);
		netdev->dev_addr[2] = *(p + 3);
		netdev->dev_addr[3] = *(p + 2);
		netdev->dev_addr[4] = *(p + 1);
		netdev->dev_addr[5] = *(p + 0);

		memcpy(netdev->perm_addr, netdev->dev_addr,
			netdev->addr_len);
		if (!is_valid_ether_addr(netdev->perm_addr)) {
			printk(KERN_ERR "%s: Bad MAC address "
				"%02x:%02x:%02x:%02x:%02x:%02x.\n",
				netxen_nic_driver_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]);
		} else {
			if (adapter->macaddr_set)
				adapter->macaddr_set(adapter,
							netdev->dev_addr);
		}
	}

	if (adapter->portnum == 0) {
		err = netxen_initialize_adapter_offload(adapter);
		if (err) 
			goto err_out_free_rx_buffer;
		val = readl(NETXEN_CRB_NORMALIZE(adapter, 
					NETXEN_CAM_RAM(0x1fc)));
		if (val == 0x55555555) {
		    /* This is the first boot after power up */
		    netxen_nic_read_w0(adapter, NETXEN_PCIE_REG(0x4), &val);
			if (!(val & 0x4)) {
				val |= 0x4;
				netxen_nic_write_w0(adapter, NETXEN_PCIE_REG(0x4), val);
				netxen_nic_read_w0(adapter, NETXEN_PCIE_REG(0x4), &val);
				if (!(val & 0x4))
					printk(KERN_ERR "%s: failed to set MSI bit in PCI-e reg\n",
							netxen_nic_driver_name);
			}
		    val = readl(NETXEN_CRB_NORMALIZE(adapter,
					NETXEN_ROMUSB_GLB_SW_RESET));
		    printk(KERN_INFO"NetXen: read 0x%08x for reset reg.\n",val);
		    if (val != 0x80000f) {
			/* clear the register for future unloads/loads */
				writel(0, NETXEN_CRB_NORMALIZE(adapter,
							NETXEN_CAM_RAM(0x1fc)));
				printk(KERN_ERR "ERROR in NetXen HW init sequence.\n");
				err = -ENODEV;
				goto err_out_free_dev;
		    }
		}

		/* clear the register for future unloads/loads */
		writel(0, NETXEN_CRB_NORMALIZE(adapter, NETXEN_CAM_RAM(0x1fc)));
		printk(KERN_INFO "State: 0x%0x\n",
			readl(NETXEN_CRB_NORMALIZE(adapter, CRB_CMDPEG_STATE)));

		/*
		 * Tell the hardware our version number.
		 */
		i = (_NETXEN_NIC_LINUX_MAJOR << 16) 
			| ((_NETXEN_NIC_LINUX_MINOR << 8))
			| (_NETXEN_NIC_LINUX_SUBVERSION);
		writel(i, NETXEN_CRB_NORMALIZE(adapter, CRB_DRIVER_VERSION));

		/* Unlock the HW, prompting the boot sequence */
		writel(1,
			NETXEN_CRB_NORMALIZE(adapter,
				NETXEN_ROMUSB_GLB_PEGTUNE_DONE));
		/* Handshake with the card before we register the devices. */
		netxen_phantom_init(adapter, NETXEN_NIC_PEG_TUNE);
	}

	/*
	 * See if the firmware gave us a virtual-physical port mapping.
	 */
	i = readl(NETXEN_CRB_NORMALIZE(adapter, CRB_V2P(adapter->portnum)));
	if (i != 0x55555555)
		physical_port[adapter->portnum] = i;

	netif_carrier_off(netdev);
	netif_stop_queue(netdev);

	if ((err = register_netdev(netdev))) {
		printk(KERN_ERR "%s: register_netdev failed port #%d"
			       " aborting\n", netxen_nic_driver_name,
			       adapter->portnum);
		err = -EIO;
		goto err_out_free_dev;
	}

	pci_set_drvdata(pdev, adapter);

	switch (adapter->ahw.board_type) {
		case NETXEN_NIC_GBE:
			printk(KERN_INFO "%s: QUAD GbE board initialized\n",
			       netxen_nic_driver_name);
			break;

		case NETXEN_NIC_XGBE:
			printk(KERN_INFO "%s: XGbE board initialized\n", 
					netxen_nic_driver_name);
			break;
	}

	adapter->driver_mismatch = 0;

	return 0;

err_out_free_dev:
	if (adapter->portnum == 0)
		netxen_free_adapter_offload(adapter);

err_out_free_rx_buffer:
	for (i = 0; i < MAX_RCV_CTX; ++i) {
		recv_ctx = &adapter->recv_ctx[i];
		for (ring = 0; ring < NUM_RCV_DESC_RINGS; ring++) {
			rcv_desc = &recv_ctx->rcv_desc[ring];
			if (rcv_desc->rx_buf_arr != NULL) {
				vfree(rcv_desc->rx_buf_arr);
				rcv_desc->rx_buf_arr = NULL;
			}
		}
	}
	vfree(cmd_buf_arr);

err_out_free_adapter:
	if (adapter->flags & NETXEN_NIC_MSI_ENABLED)
		pci_disable_msi(pdev);

	pci_set_drvdata(pdev, NULL);

	if (db_ptr)
		iounmap(db_ptr);

err_out_iounmap:
	if (mem_ptr0)
		iounmap(mem_ptr0);
	if (mem_ptr1)
		iounmap(mem_ptr1);
	if (mem_ptr2)
		iounmap(mem_ptr2);

err_out_free_netdev:
	free_netdev(netdev);

err_out_free_res:
	pci_release_regions(pdev);

err_out_disable_pdev:
	pci_disable_device(pdev);
	return err;
}

static void __devexit netxen_nic_remove(struct pci_dev *pdev)
{
	struct netxen_adapter *adapter;
	struct net_device *netdev;
	struct netxen_rx_buffer *buffer;
	struct netxen_recv_context *recv_ctx;
	struct netxen_rcv_desc_ctx *rcv_desc;
	int i, ctxid, ring;
	static int init_firmware_done = 0;

	adapter = pci_get_drvdata(pdev);
	if (adapter == NULL)
		return;

	netdev = adapter->netdev;

	unregister_netdev(netdev);

	if (adapter->stop_port)
		adapter->stop_port(adapter);

	netxen_nic_disable_int(adapter);

	if (adapter->is_up == NETXEN_ADAPTER_UP_MAGIC) {
		init_firmware_done++;
		netxen_free_hw_resources(adapter);
	}

	for (ctxid = 0; ctxid < MAX_RCV_CTX; ++ctxid) {
		recv_ctx = &adapter->recv_ctx[ctxid];
		for (ring = 0; ring < NUM_RCV_DESC_RINGS; ring++) {
			rcv_desc = &recv_ctx->rcv_desc[ring];
			for (i = 0; i < rcv_desc->max_rx_desc_count; ++i) {
				buffer = &(rcv_desc->rx_buf_arr[i]);
				if (buffer->state == NETXEN_BUFFER_FREE)
					continue;
				pci_unmap_single(pdev, buffer->dma,
						 rcv_desc->dma_size,
						 PCI_DMA_FROMDEVICE);
				if (buffer->skb != NULL)
					dev_kfree_skb_any(buffer->skb);
			}
			vfree(rcv_desc->rx_buf_arr);
		}
	}

	vfree(adapter->cmd_buf_arr);

	if (adapter->portnum == 0) {
		if (init_firmware_done) {
			i = 100;
			do {
				if (dma_watchdog_shutdown_request(adapter) == 1)
					break;
				msleep(100);
				if (dma_watchdog_shutdown_poll_result(adapter) == 1)
					break;
			} while (--i);

			if (i == 0)
				printk(KERN_ERR "%s: dma_watchdog_shutdown failed\n",
						netdev->name);

			/* clear the register for future unloads/loads */
			writel(0, NETXEN_CRB_NORMALIZE(adapter, NETXEN_CAM_RAM(0x1fc)));
			printk(KERN_INFO "State: 0x%0x\n",
				readl(NETXEN_CRB_NORMALIZE(adapter, CRB_CMDPEG_STATE)));

			/* leave the hw in the same state as reboot */
			writel(0, NETXEN_CRB_NORMALIZE(adapter, CRB_CMDPEG_STATE));
			netxen_pinit_from_rom(adapter, 0);
			msleep(1);
			netxen_load_firmware(adapter);
			netxen_phantom_init(adapter, NETXEN_NIC_PEG_TUNE);
		}

		/* clear the register for future unloads/loads */
		writel(0, NETXEN_CRB_NORMALIZE(adapter, NETXEN_CAM_RAM(0x1fc)));
		printk(KERN_INFO "State: 0x%0x\n",
			readl(NETXEN_CRB_NORMALIZE(adapter, CRB_CMDPEG_STATE)));

		i = 100;
		do {
			if (dma_watchdog_shutdown_request(adapter) == 1)
				break;
			msleep(100);
			if (dma_watchdog_shutdown_poll_result(adapter) == 1)
				break;
		} while (--i);

		if (i) {
			netxen_free_adapter_offload(adapter);
		} else {
			printk(KERN_ERR "%s: dma_watchdog_shutdown failed\n",
					netdev->name);
		}
	}

	if (adapter->irq)
		free_irq(adapter->irq, adapter);

	if (adapter->flags & NETXEN_NIC_MSI_ENABLED)
		pci_disable_msi(pdev);

	iounmap(adapter->ahw.db_base);
	iounmap(adapter->ahw.pci_base0);
	iounmap(adapter->ahw.pci_base1);
	iounmap(adapter->ahw.pci_base2);

	pci_release_regions(pdev);
	pci_disable_device(pdev);
	pci_set_drvdata(pdev, NULL);

	free_netdev(netdev);
}

/*
 * Called when a network interface is made active
 * @returns 0 on success, negative value on failure
 */
static int netxen_nic_open(struct net_device *netdev)
{
	struct netxen_adapter *adapter = (struct netxen_adapter *)netdev->priv;
	int err = 0;
	int ctx, ring;

	if (adapter->is_up != NETXEN_ADAPTER_UP_MAGIC) {
		err = netxen_init_firmware(adapter);
		if (err != 0) {
			printk(KERN_ERR "Failed to init firmware\n");
			return -EIO;
		}
		netxen_nic_flash_print(adapter);

		/* setup all the resources for the Phantom... */
		/* this include the descriptors for rcv, tx, and status */
		netxen_nic_clear_stats(adapter);
		err = netxen_nic_hw_resources(adapter);
		if (err) {
			printk(KERN_ERR "Error in setting hw resources:%d\n",
			       err);
			return err;
		}
		for (ctx = 0; ctx < MAX_RCV_CTX; ++ctx) {
			for (ring = 0; ring < NUM_RCV_DESC_RINGS; ring++)
				netxen_post_rx_buffers(adapter, ctx, ring);
		}
		adapter->irq = adapter->ahw.pdev->irq;
		err = request_irq(adapter->ahw.pdev->irq, netxen_intr,
				  IRQF_SHARED|IRQF_SAMPLE_RANDOM, netdev->name,
				  adapter);
		if (err) {
			printk(KERN_ERR "request_irq failed with: %d\n", err);
			netxen_free_hw_resources(adapter);
			return err;
		}

		adapter->is_up = NETXEN_ADAPTER_UP_MAGIC;
	}
	if (!adapter->driver_mismatch)
		mod_timer(&adapter->watchdog_timer, jiffies);

	napi_enable(&adapter->napi);

	netxen_nic_enable_int(adapter);

	/* Done here again so that even if phantom sw overwrote it,
	 * we set it */
	if (adapter->init_port
	    && adapter->init_port(adapter, adapter->portnum) != 0) {
	    del_timer_sync(&adapter->watchdog_timer);
		printk(KERN_ERR "%s: Failed to initialize port %d\n",
				netxen_nic_driver_name, adapter->portnum);
		napi_disable(&adapter->napi);
		return -EIO;
	}
	if (adapter->macaddr_set)
		adapter->macaddr_set(adapter, netdev->dev_addr);

	netxen_nic_set_link_parameters(adapter);

	netxen_nic_set_multi(netdev);
	if (adapter->set_mtu)
		adapter->set_mtu(adapter, netdev->mtu);

	if (!adapter->driver_mismatch)
		netif_start_queue(netdev);

	return 0;
}

/*
 * netxen_nic_close - Disables a network interface entry point
 */
static int netxen_nic_close(struct net_device *netdev)
{
	struct netxen_adapter *adapter = netdev_priv(netdev);
	int i, j;
	struct netxen_cmd_buffer *cmd_buff;
	struct netxen_skb_frag *buffrag;

	netif_carrier_off(netdev);
	netif_stop_queue(netdev);
	napi_disable(&adapter->napi);

	netxen_nic_disable_int(adapter);

	cmd_buff = adapter->cmd_buf_arr;
	for (i = 0; i < adapter->max_tx_desc_count; i++) {
		buffrag = cmd_buff->frag_array;
		if (buffrag->dma) {
			pci_unmap_single(adapter->pdev, buffrag->dma,
					 buffrag->length, PCI_DMA_TODEVICE);
			buffrag->dma = 0ULL;
		}
		for (j = 0; j < cmd_buff->frag_count; j++) {
			buffrag++;
			if (buffrag->dma) {
				pci_unmap_page(adapter->pdev, buffrag->dma,
					       buffrag->length, 
					       PCI_DMA_TODEVICE);
				buffrag->dma = 0ULL;
			}
		}
		/* Free the skb we received in netxen_nic_xmit_frame */
		if (cmd_buff->skb) {
			dev_kfree_skb_any(cmd_buff->skb);
			cmd_buff->skb = NULL;
		}
		cmd_buff++;
	}
	if (adapter->is_up == NETXEN_ADAPTER_UP_MAGIC) {
		FLUSH_SCHEDULED_WORK();
		del_timer_sync(&adapter->watchdog_timer);
	}

	return 0;
}

static int netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
	struct netxen_adapter *adapter = netdev_priv(netdev);
	struct netxen_hardware_context *hw = &adapter->ahw;
	unsigned int first_seg_len = skb->len - skb->data_len;
	struct netxen_skb_frag *buffrag;
	unsigned int i;

	u32 producer = 0;
	u32 saved_producer = 0;
	struct cmd_desc_type0 *hwdesc;
	int k;
	struct netxen_cmd_buffer *pbuf = NULL;
	static int dropped_packet = 0;
	int frag_count;
	u32 local_producer = 0;
	u32 max_tx_desc_count = 0;
	u32 last_cmd_consumer = 0;
	int no_of_desc;

	adapter->stats.xmitcalled++;
	frag_count = skb_shinfo(skb)->nr_frags + 1;

	if (unlikely(skb->len <= 0)) {
		dev_kfree_skb_any(skb);
		adapter->stats.badskblen++;
		return NETDEV_TX_OK;
	}

	if (frag_count > MAX_BUFFERS_PER_CMD) {
		printk("%s: %s netxen_nic_xmit_frame: frag_count (%d)"
		       "too large, can handle only %d frags\n",
		       netxen_nic_driver_name, netdev->name,
		       frag_count, MAX_BUFFERS_PER_CMD);
		adapter->stats.txdropped++;
		if ((++dropped_packet & 0xff) == 0xff)
			printk("%s: %s droppped packets = %d\n",
			       netxen_nic_driver_name, netdev->name,
			       dropped_packet);

		return NETDEV_TX_OK;
	}

	/*
	 * Everything is set up. Now, we just need to transmit it out.
	 * Note that we have to copy the contents of buffer over to
	 * right place. Later on, this can be optimized out by de-coupling the
	 * producer index from the buffer index.
	 */
      retry_getting_window:
	spin_lock_bh(&adapter->tx_lock);
	if (adapter->total_threads >= MAX_XMIT_PRODUCERS) {
		spin_unlock_bh(&adapter->tx_lock);
		/*
		 * Yield CPU
		 */
		if (!in_atomic())
			schedule();
		else {
			for (i = 0; i < 20; i++)
				cpu_relax();	/*This a nop instr on i386 */
		}
		goto retry_getting_window;
	}
	local_producer = adapter->cmd_producer;
	/* There 4 fragments per descriptor */
	no_of_desc = (frag_count + 3) >> 2;
	if (netdev->features & NETIF_F_TSO) {
		if (skb_shinfo(skb)->gso_size > 0) {

			no_of_desc++;
			if ((ip_hdrlen(skb) + tcp_hdrlen(skb) +
			     sizeof(struct ethhdr)) >
			    (sizeof(struct cmd_desc_type0) - 2)) {
				no_of_desc++;
			}
		}
	}
	k = adapter->cmd_producer;
	max_tx_desc_count = adapter->max_tx_desc_count;
	last_cmd_consumer = adapter->last_cmd_consumer;
	if ((k + no_of_desc) >=
	    ((last_cmd_consumer <= k) ? last_cmd_consumer + max_tx_desc_count :
	     last_cmd_consumer)) {
		netif_stop_queue(netdev);
		adapter->flags |= NETXEN_NETDEV_STATUS;
		spin_unlock_bh(&adapter->tx_lock);
		return NETDEV_TX_BUSY;
	}
	k = get_index_range(k, max_tx_desc_count, no_of_desc);
	adapter->cmd_producer = k;
	adapter->total_threads++;
	adapter->num_threads++;

	spin_unlock_bh(&adapter->tx_lock);
	/* Copy the descriptors into the hardware    */
	producer = local_producer;
	saved_producer = producer;
	hwdesc = &hw->cmd_desc_head[producer];
	memset(hwdesc, 0, sizeof(struct cmd_desc_type0));
	/* Take skb->data itself */
	pbuf = &adapter->cmd_buf_arr[producer];
	if ((netdev->features & NETIF_F_TSO) && skb_shinfo(skb)->gso_size > 0) {
		pbuf->mss = skb_shinfo(skb)->gso_size;
		hwdesc->mss = cpu_to_le16(skb_shinfo(skb)->gso_size);
	} else {
		pbuf->mss = 0;
		hwdesc->mss = 0;
	}
	pbuf->total_length = skb->len;
	pbuf->skb = skb;
	pbuf->cmd = TX_ETHER_PKT;
	pbuf->frag_count = frag_count;
	pbuf->port = adapter->portnum;
	buffrag = &pbuf->frag_array[0];
	buffrag->dma = pci_map_single(adapter->pdev, skb->data, first_seg_len,
				      PCI_DMA_TODEVICE);
	buffrag->length = first_seg_len;
	netxen_set_cmd_desc_totallength(hwdesc, skb->len);
	netxen_set_cmd_desc_num_of_buff(hwdesc, frag_count);
	netxen_set_cmd_desc_opcode(hwdesc, TX_ETHER_PKT);

	netxen_set_cmd_desc_port(hwdesc, adapter->portnum);
	netxen_set_cmd_desc_ctxid(hwdesc, adapter->portnum);
	hwdesc->buffer1_length = cpu_to_le16(first_seg_len);
	hwdesc->addr_buffer1 = cpu_to_le64(buffrag->dma);

	for (i = 1, k = 1; i < frag_count; i++, k++) {
		struct skb_frag_struct *frag;
		int len, temp_len;
		unsigned long offset;
		dma_addr_t temp_dma;

		/* move to next desc. if there is a need */
		if ((i & 0x3) == 0) {
			k = 0;
			producer = get_next_index(producer,
						  adapter->max_tx_desc_count);
			hwdesc = &hw->cmd_desc_head[producer];
			memset(hwdesc, 0, sizeof(struct cmd_desc_type0));
		}
		frag = &skb_shinfo(skb)->frags[i - 1];
		len = frag->size;
		offset = frag->page_offset;

		temp_len = len;
		temp_dma = pci_map_page(adapter->pdev, frag->page, offset,
					len, PCI_DMA_TODEVICE);

		buffrag++;
		buffrag->dma = temp_dma;
		buffrag->length = temp_len;

		DPRINTK(INFO, "for loop. i=%d k=%d\n", i, k);
		switch (k) {
		case 0:
			hwdesc->buffer1_length = cpu_to_le16(temp_len);
			hwdesc->addr_buffer1 = cpu_to_le64(temp_dma);
			break;
		case 1:
			hwdesc->buffer2_length = cpu_to_le16(temp_len);
			hwdesc->addr_buffer2 = cpu_to_le64(temp_dma);
			break;
		case 2:
			hwdesc->buffer3_length = cpu_to_le16(temp_len);
			hwdesc->addr_buffer3 = cpu_to_le64(temp_dma);
			break;
		case 3:
			hwdesc->buffer4_length = cpu_to_le16(temp_len);
			hwdesc->addr_buffer4 = cpu_to_le64(temp_dma);
			break;
		}
		frag++;
	}
	producer = get_next_index(producer, adapter->max_tx_desc_count);

	/* might change opcode to TX_TCP_LSO */
	netxen_tso_check(adapter, &hw->cmd_desc_head[saved_producer], skb);

	/* For LSO, we need to copy the MAC/IP/TCP headers into
	 * the descriptor ring
	 */
	if (netxen_get_cmd_desc_opcode(&hw->cmd_desc_head[saved_producer])
	    == TX_TCP_LSO) {
		int hdr_len, first_hdr_len, more_hdr;
		hdr_len = hw->cmd_desc_head[saved_producer].total_hdr_length;
		if (hdr_len > (sizeof(struct cmd_desc_type0) - 2)) {
			first_hdr_len = sizeof(struct cmd_desc_type0) - 2;
			more_hdr = 1;
		} else {
			first_hdr_len = hdr_len;
			more_hdr = 0;
		}
		/* copy the MAC/IP/TCP headers to the cmd descriptor list */
		hwdesc = &hw->cmd_desc_head[producer];

		/* copy the first 64 bytes */
		memcpy(((void *)hwdesc) + 2,
		       (void *)(skb->data), first_hdr_len);
		producer = get_next_index(producer, max_tx_desc_count);

		if (more_hdr) {
			hwdesc = &hw->cmd_desc_head[producer];
			/* copy the next 64 bytes - should be enough except
			 * for pathological case
			 */
			skb_copy_from_linear_data_offset(skb, first_hdr_len,
							 hwdesc,
							 (hdr_len -
							  first_hdr_len));
			producer = get_next_index(producer, max_tx_desc_count);
		}
	}

	i = netxen_get_cmd_desc_totallength(&hw->cmd_desc_head[saved_producer]);

	hw->cmd_desc_head[saved_producer].flags_opcode =
		cpu_to_le16(hw->cmd_desc_head[saved_producer].flags_opcode);
	hw->cmd_desc_head[saved_producer].num_of_buffers_total_length =
	  cpu_to_le32(hw->cmd_desc_head[saved_producer].
			  num_of_buffers_total_length);

	spin_lock_bh(&adapter->tx_lock);
	adapter->stats.txbytes += i;

	/* Code to update the adapter considering how many producer threads
	   are currently working */
	if ((--adapter->num_threads) == 0) {
		/* This is the last thread */
		u32 crb_producer = adapter->cmd_producer;
		netxen_nic_update_cmd_producer(adapter, crb_producer);
		wmb();
		adapter->total_threads = 0;
	}

	adapter->stats.xmitfinished++;
	spin_unlock_bh(&adapter->tx_lock);

	netdev->trans_start = jiffies;

	DPRINTK(INFO, "wrote CMD producer %x to phantom\n", producer);

	DPRINTK(INFO, "Done. Send\n");
	return NETDEV_TX_OK;
}

static void netxen_watchdog(unsigned long v)
{
	struct netxen_adapter *adapter = (struct netxen_adapter *)v;

	SCHEDULE_WORK(&adapter->watchdog_task);
}

static void netxen_tx_timeout(struct net_device *netdev)
{
	struct netxen_adapter *adapter = (struct netxen_adapter *)
						netdev_priv(netdev);
	SCHEDULE_WORK(&adapter->tx_timeout_task);
}

static void netxen_tx_timeout_task(struct work_struct *work)
{
	struct netxen_adapter *adapter = 
		container_of(work, struct netxen_adapter, tx_timeout_task);

	printk(KERN_ERR "%s %s: transmit timeout, resetting.\n",
	       netxen_nic_driver_name, adapter->netdev->name);

	netxen_nic_close(adapter->netdev);
	netxen_nic_open(adapter->netdev);
	adapter->netdev->trans_start = jiffies;
	netif_wake_queue(adapter->netdev);
}

static int
netxen_handle_int(struct netxen_adapter *adapter, struct net_device *netdev)
{
	u32 ret = 0;

	DPRINTK(INFO, "Entered handle ISR\n");
	adapter->stats.ints++;

	netxen_nic_disable_int(adapter);

	if (netxen_nic_rx_has_work(adapter) || netxen_nic_tx_has_work(adapter)) {
		if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
			/*
			 * Interrupts are already disabled.
			 */
			__netif_rx_schedule(netdev, &adapter->napi);
		} else {
			static unsigned int intcount = 0;
			if ((++intcount & 0xfff) == 0xfff)
				DPRINTK(KERN_ERR
				       "%s: %s interrupt %d while in poll\n",
				       netxen_nic_driver_name, netdev->name,
				       intcount);
		}
		ret = 1;
	}

	if (ret == 0) {
		netxen_nic_enable_int(adapter);
	}

	return ret;
}

/*
 * netxen_intr - Interrupt Handler
 * @irq: interrupt number
 * data points to adapter stucture (which may be handling more than 1 port
 */
irqreturn_t netxen_intr(int irq, void *data)
{
	struct netxen_adapter *adapter;
	struct net_device *netdev;
	u32 our_int = 0;

	if (unlikely(!irq)) {
		return IRQ_NONE;	/* Not our interrupt */
	}

	adapter = (struct netxen_adapter *)data;
	netdev  = adapter->netdev;

	if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
		our_int = readl(NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
		/* not our interrupt */
		if ((our_int & (0x80 << adapter->portnum)) == 0)
			return IRQ_NONE;
	}

	if (adapter->intr_scheme == INTR_SCHEME_PERPORT) {
		/* claim interrupt */
		if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
			writel(our_int & ~((u32)(0x80 << adapter->portnum)),
			NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
		}
	}

	if (netif_running(netdev))
		netxen_handle_int(adapter, netdev);

	return IRQ_HANDLED;
}

static int netxen_nic_poll(struct napi_struct *napi, int budget)
{
	struct netxen_adapter *adapter = container_of(napi, struct netxen_adapter, napi);
	struct net_device *netdev = adapter->netdev;
	int done = 1;
	int ctx;
	int work_done;

	DPRINTK(INFO, "polling for %d descriptors\n", *budget);

	work_done = 0;
	for (ctx = 0; ctx < MAX_RCV_CTX; ++ctx) {
		/*
		 * Fairness issue. This will give undue weight to the
		 * receive context 0.
		 */

		/*
		 * To avoid starvation, we give each of our receivers,
		 * a fraction of the quota. Sometimes, it might happen that we
		 * have enough quota to process every packet, but since all the
		 * packets are on one context, it gets only half of the quota,
		 * and ends up not processing it.
		 */
		work_done += netxen_process_rcv_ring(adapter, ctx,
						     budget / MAX_RCV_CTX);
	}

	if (work_done >= budget && netxen_nic_rx_has_work(adapter) != 0)
		done = 0;

	if (netxen_process_cmd_ring((unsigned long)adapter) == 0)
		done = 0;

	DPRINTK(INFO, "new work_done: %d work_to_do: %d\n",
		work_done, work_to_do);
	if (done) {
		netif_rx_complete(netdev, napi);
		netxen_nic_enable_int(adapter);
	}

	return work_done;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void netxen_nic_poll_controller(struct net_device *netdev)
{
	struct netxen_adapter *adapter = netdev_priv(netdev);
	disable_irq(adapter->irq);
	netxen_intr(adapter->irq, adapter);
	enable_irq(adapter->irq);
}
#endif

static struct pci_driver netxen_driver = {
	.name = netxen_nic_driver_name,
	.id_table = netxen_pci_tbl,
	.probe = netxen_nic_probe,
	.remove = __devexit_p(netxen_nic_remove)
};

/* Driver Registration on NetXen card    */

static int __init netxen_init_module(void)
{
	if ((netxen_workq = create_singlethread_workqueue("netxen")) == 0)
		return -ENOMEM;

	return pci_register_driver(&netxen_driver);
}

module_init(netxen_init_module);

static void __exit netxen_exit_module(void)
{
	/*
	 * Wait for some time to allow the dma to drain, if any.
	 */
	msleep(100);
	pci_unregister_driver(&netxen_driver);
	destroy_workqueue(netxen_workq);
}

module_exit(netxen_exit_module);