summaryrefslogtreecommitdiffstats
path: root/drivers/net/netxen/netxen_nic_main.c
blob: 008fd6618a5f527b39abfa4742c9be8b63c67ed3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
/*
 * 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;

static int port_mode = NETXEN_PORT_MODE_AUTO_NEG;

/* Default to restricted 1G auto-neg mode */
static int wol_port_mode = 5;

static int use_msi = 1;

static int use_msi_x = 1;

/* 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_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);
static irqreturn_t netxen_msi_intr(int irq, void *data);

/*  PCI Device ID Table  */
#define ENTRY(device) \
	{PCI_DEVICE(0x4040, (device)), \
	.class = PCI_CLASS_NETWORK_ETHERNET << 8, .class_mask = ~0}

static struct pci_device_id netxen_pci_tbl[] __devinitdata = {
	ENTRY(0x0001),
	ENTRY(0x0002),
	ENTRY(0x0003),
	ENTRY(0x0004),
	ENTRY(0x0005),
	ENTRY(0x0024),
	ENTRY(0x0025),
	ENTRY(0x0100),
	{0,}
};

MODULE_DEVICE_TABLE(pci, netxen_pci_tbl);

/*
 * In netxen_nic_down(), we must wait for any pending callback requests into
 * netxen_watchdog_task() to complete; eg otherwise the watchdog_timer could be
 * reenabled right after it is deleted in netxen_nic_down().
 * FLUSH_SCHEDULED_WORK()  does this synchronization.
 *
 * Normally, schedule_work()/flush_scheduled_work() could have worked, but
 * netxen_nic_close() is invoked with kernel rtnl lock held. netif_carrier_off()
 * call in netxen_nic_close() triggers a schedule_work(&linkwatch_work), and a
 * subsequent call to flush_scheduled_work() in netxen_nic_down() would cause
 * linkwatch_event() to be executed which also attempts to acquire the rtnl
 * lock thus causing a deadlock.
 */

static struct workqueue_struct *netxen_workq;
#define SCHEDULE_WORK(tp)	queue_work(netxen_workq, tp)
#define FLUSH_SCHEDULED_WORK()	flush_workqueue(netxen_workq)

static void netxen_watchdog(unsigned long);

static uint32_t crb_cmd_producer[4] = {
	CRB_CMD_PRODUCER_OFFSET, CRB_CMD_PRODUCER_OFFSET_1,
	CRB_CMD_PRODUCER_OFFSET_2, CRB_CMD_PRODUCER_OFFSET_3
};

void
netxen_nic_update_cmd_producer(struct netxen_adapter *adapter,
		uint32_t crb_producer)
{
	adapter->pci_write_normalize(adapter,
			adapter->crb_addr_cmd_producer, crb_producer);
}

static uint32_t crb_cmd_consumer[4] = {
	CRB_CMD_CONSUMER_OFFSET, CRB_CMD_CONSUMER_OFFSET_1,
	CRB_CMD_CONSUMER_OFFSET_2, CRB_CMD_CONSUMER_OFFSET_3
};

static inline void
netxen_nic_update_cmd_consumer(struct netxen_adapter *adapter,
		u32 crb_consumer)
{
	adapter->pci_write_normalize(adapter,
			adapter->crb_addr_cmd_consumer, crb_consumer);
}

static uint32_t msi_tgt_status[8] = {
	ISR_INT_TARGET_STATUS, ISR_INT_TARGET_STATUS_F1,
	ISR_INT_TARGET_STATUS_F2, ISR_INT_TARGET_STATUS_F3,
	ISR_INT_TARGET_STATUS_F4, ISR_INT_TARGET_STATUS_F5,
	ISR_INT_TARGET_STATUS_F6, ISR_INT_TARGET_STATUS_F7
};

static struct netxen_legacy_intr_set legacy_intr[] = NX_LEGACY_INTR_CONFIG;

static inline void netxen_nic_disable_int(struct netxen_adapter *adapter)
{
	adapter->pci_write_normalize(adapter, adapter->crb_intr_mask, 0);
}

static inline void netxen_nic_enable_int(struct netxen_adapter *adapter)
{
	adapter->pci_write_normalize(adapter, adapter->crb_intr_mask, 0x1);

	if (!NETXEN_IS_MSI_FAMILY(adapter))
		adapter->pci_write_immediate(adapter,
				adapter->legacy_intr.tgt_mask_reg, 0xfbff);
}

static int nx_set_dma_mask(struct netxen_adapter *adapter, uint8_t revision_id)
{
	struct pci_dev *pdev = adapter->pdev;
	int err;
	uint64_t mask;

#ifdef CONFIG_IA64
	adapter->dma_mask = DMA_32BIT_MASK;
#else
	if (revision_id >= NX_P3_B0) {
		/* should go to DMA_64BIT_MASK */
		adapter->dma_mask = DMA_39BIT_MASK;
		mask = DMA_39BIT_MASK;
	} else if (revision_id == NX_P3_A2) {
		adapter->dma_mask = DMA_39BIT_MASK;
		mask = DMA_39BIT_MASK;
	} else if (revision_id == NX_P2_C1) {
		adapter->dma_mask = DMA_35BIT_MASK;
		mask = DMA_35BIT_MASK;
	} else {
		adapter->dma_mask = DMA_32BIT_MASK;
		mask = DMA_32BIT_MASK;
		goto set_32_bit_mask;
	}

	/*
	 * Consistent DMA mask is set to 32 bit because it cannot be set to
	 * 35 bits. For P3 also leave it at 32 bits for now. Only the rings
	 * come off this pool.
	 */
	if (pci_set_dma_mask(pdev, mask) == 0 &&
		pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK) == 0) {
		adapter->pci_using_dac = 1;
		return 0;
	}
#endif /* CONFIG_IA64 */

set_32_bit_mask:
	err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
	if (!err)
		err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
	if (err) {
		DPRINTK(ERR, "No usable DMA configuration, aborting:%d\n", err);
		return err;
	}

	adapter->pci_using_dac = 0;
	return 0;
}

static void netxen_check_options(struct netxen_adapter *adapter)
{
	switch (adapter->ahw.boardcfg.board_type) {
	case NETXEN_BRDTYPE_P3_HMEZ:
	case NETXEN_BRDTYPE_P3_XG_LOM:
	case NETXEN_BRDTYPE_P3_10G_CX4:
	case NETXEN_BRDTYPE_P3_10G_CX4_LP:
	case NETXEN_BRDTYPE_P3_IMEZ:
	case NETXEN_BRDTYPE_P3_10G_SFP_PLUS:
	case NETXEN_BRDTYPE_P3_10G_SFP_QT:
	case NETXEN_BRDTYPE_P3_10G_SFP_CT:
	case NETXEN_BRDTYPE_P3_10G_XFP:
	case NETXEN_BRDTYPE_P3_10000_BASE_T:
		adapter->msix_supported = !!use_msi_x;
		adapter->max_rx_desc_count = MAX_RCV_DESCRIPTORS_10G;
		break;

	case NETXEN_BRDTYPE_P2_SB31_10G:
	case NETXEN_BRDTYPE_P2_SB31_10G_CX4:
	case NETXEN_BRDTYPE_P2_SB31_10G_IMEZ:
	case NETXEN_BRDTYPE_P2_SB31_10G_HMEZ:
		adapter->msix_supported = 0;
		adapter->max_rx_desc_count = MAX_RCV_DESCRIPTORS_10G;
		break;

	case NETXEN_BRDTYPE_P3_REF_QG:
	case NETXEN_BRDTYPE_P3_4_GB:
	case NETXEN_BRDTYPE_P3_4_GB_MM:
		adapter->msix_supported = 0;
		adapter->max_rx_desc_count = MAX_RCV_DESCRIPTORS_10G;
		break;

	case NETXEN_BRDTYPE_P2_SB35_4G:
	case NETXEN_BRDTYPE_P2_SB31_2G:
		adapter->msix_supported = 0;
		adapter->max_rx_desc_count = MAX_RCV_DESCRIPTORS_1G;
		break;

	default:
		adapter->msix_supported = 0;
		adapter->max_rx_desc_count = MAX_RCV_DESCRIPTORS_1G;

		printk(KERN_WARNING "Unknown board type(0x%x)\n",
				adapter->ahw.boardcfg.board_type);
		break;
	}

	adapter->max_tx_desc_count = MAX_CMD_DESCRIPTORS_HOST;
	adapter->max_jumbo_rx_desc_count = MAX_JUMBO_RCV_DESCRIPTORS;
	adapter->max_lro_rx_desc_count = MAX_LRO_RCV_DESCRIPTORS;

	adapter->max_possible_rss_rings = 1;
	return;
}

static int
netxen_check_hw_init(struct netxen_adapter *adapter, int first_boot)
{
	int ret = 0;

	if (first_boot == 0x55555555) {
		/* This is the first boot after power up */

		/* PCI bus master workaround */
		adapter->hw_read_wx(adapter,
			NETXEN_PCIE_REG(0x4), &first_boot, 4);
		if (!(first_boot & 0x4)) {
			first_boot |= 0x4;
			adapter->hw_write_wx(adapter,
				NETXEN_PCIE_REG(0x4), &first_boot, 4);
			adapter->hw_read_wx(adapter,
				NETXEN_PCIE_REG(0x4), &first_boot, 4);
		}

		/* This is the first boot after power up */
		adapter->hw_read_wx(adapter,
			NETXEN_ROMUSB_GLB_SW_RESET, &first_boot, 4);
		if (first_boot != 0x80000f) {
			/* clear the register for future unloads/loads */
			adapter->pci_write_normalize(adapter,
					NETXEN_CAM_RAM(0x1fc), 0);
			ret = -1;
		}

		if (NX_IS_REVISION_P2(adapter->ahw.revision_id)) {
			/* Start P2 boot loader */
			adapter->pci_write_normalize(adapter,
				NETXEN_CAM_RAM(0x1fc), NETXEN_BDINFO_MAGIC);
			adapter->pci_write_normalize(adapter,
					NETXEN_ROMUSB_GLB_PEGTUNE_DONE, 1);
		}
	}
	return ret;
}

static void netxen_set_port_mode(struct netxen_adapter *adapter)
{
	u32 val, data;

	val = adapter->ahw.boardcfg.board_type;
	if ((val == NETXEN_BRDTYPE_P3_HMEZ) ||
		(val == NETXEN_BRDTYPE_P3_XG_LOM)) {
		if (port_mode == NETXEN_PORT_MODE_802_3_AP) {
			data = NETXEN_PORT_MODE_802_3_AP;
			adapter->hw_write_wx(adapter,
				NETXEN_PORT_MODE_ADDR, &data, 4);
		} else if (port_mode == NETXEN_PORT_MODE_XG) {
			data = NETXEN_PORT_MODE_XG;
			adapter->hw_write_wx(adapter,
				NETXEN_PORT_MODE_ADDR, &data, 4);
		} else if (port_mode == NETXEN_PORT_MODE_AUTO_NEG_1G) {
			data = NETXEN_PORT_MODE_AUTO_NEG_1G;
			adapter->hw_write_wx(adapter,
				NETXEN_PORT_MODE_ADDR, &data, 4);
		} else if (port_mode == NETXEN_PORT_MODE_AUTO_NEG_XG) {
			data = NETXEN_PORT_MODE_AUTO_NEG_XG;
			adapter->hw_write_wx(adapter,
				NETXEN_PORT_MODE_ADDR, &data, 4);
		} else {
			data = NETXEN_PORT_MODE_AUTO_NEG;
			adapter->hw_write_wx(adapter,
				NETXEN_PORT_MODE_ADDR, &data, 4);
		}

		if ((wol_port_mode != NETXEN_PORT_MODE_802_3_AP) &&
			(wol_port_mode != NETXEN_PORT_MODE_XG) &&
			(wol_port_mode != NETXEN_PORT_MODE_AUTO_NEG_1G) &&
			(wol_port_mode != NETXEN_PORT_MODE_AUTO_NEG_XG)) {
			wol_port_mode = NETXEN_PORT_MODE_AUTO_NEG;
		}
		adapter->hw_write_wx(adapter, NETXEN_WOL_PORT_MODE,
			&wol_port_mode, 4);
	}
}

#define PCI_CAP_ID_GEN  0x10

static void netxen_pcie_strap_init(struct netxen_adapter *adapter)
{
	u32 pdevfuncsave;
	u32 c8c9value = 0;
	u32 chicken = 0;
	u32 control = 0;
	int i, pos;
	struct pci_dev *pdev;

	pdev = adapter->pdev;

	adapter->hw_read_wx(adapter,
		NETXEN_PCIE_REG(PCIE_CHICKEN3), &chicken, 4);
	/* clear chicken3.25:24 */
	chicken &= 0xFCFFFFFF;
	/*
	 * if gen1 and B0, set F1020 - if gen 2, do nothing
	 * if gen2 set to F1000
	 */
	pos = pci_find_capability(pdev, PCI_CAP_ID_GEN);
	if (pos == 0xC0) {
		pci_read_config_dword(pdev, pos + 0x10, &control);
		if ((control & 0x000F0000) != 0x00020000) {
			/*  set chicken3.24 if gen1 */
			chicken |= 0x01000000;
		}
		printk(KERN_INFO "%s Gen2 strapping detected\n",
				netxen_nic_driver_name);
		c8c9value = 0xF1000;
	} else {
		/* set chicken3.24 if gen1 */
		chicken |= 0x01000000;
		printk(KERN_INFO "%s Gen1 strapping detected\n",
				netxen_nic_driver_name);
		if (adapter->ahw.revision_id == NX_P3_B0)
			c8c9value = 0xF1020;
		else
			c8c9value = 0;

	}
	adapter->hw_write_wx(adapter,
		NETXEN_PCIE_REG(PCIE_CHICKEN3), &chicken, 4);

	if (!c8c9value)
		return;

	pdevfuncsave = pdev->devfn;
	if (pdevfuncsave & 0x07)
		return;

	for (i = 0; i < 8; i++) {
		pci_read_config_dword(pdev, pos + 8, &control);
		pci_read_config_dword(pdev, pos + 8, &control);
		pci_write_config_dword(pdev, pos + 8, c8c9value);
		pdev->devfn++;
	}
	pdev->devfn = pdevfuncsave;
}

static void netxen_set_msix_bit(struct pci_dev *pdev, int enable)
{
	u32 control;
	int pos;

	pos = pci_find_capability(pdev, PCI_CAP_ID_MSIX);
	if (pos) {
		pci_read_config_dword(pdev, pos, &control);
		if (enable)
			control |= PCI_MSIX_FLAGS_ENABLE;
		else
			control = 0;
		pci_write_config_dword(pdev, pos, control);
	}
}

static void netxen_init_msix_entries(struct netxen_adapter *adapter)
{
	int i;

	for (i = 0; i < MSIX_ENTRIES_PER_ADAPTER; i++)
		adapter->msix_entries[i].entry = i;
}

static int
netxen_read_mac_addr(struct netxen_adapter *adapter)
{
	int i;
	unsigned char *p;
	__le64 mac_addr;
	DECLARE_MAC_BUF(mac);
	struct net_device *netdev = adapter->netdev;
	struct pci_dev *pdev = adapter->pdev;

	if (netxen_is_flash_supported(adapter) != 0)
		return -EIO;

	if (NX_IS_REVISION_P3(adapter->ahw.revision_id)) {
		if (netxen_p3_get_mac_addr(adapter, &mac_addr) != 0)
			return -EIO;
	} else {
		if (netxen_get_flash_mac_addr(adapter, &mac_addr) != 0)
			return -EIO;
	}

	p = (unsigned char *)&mac_addr;
	for (i = 0; i < 6; i++)
		netdev->dev_addr[i] = *(p + 5 - i);

	memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);

	/* set station address */

	if (!is_valid_ether_addr(netdev->perm_addr)) {
		dev_warn(&pdev->dev, "Bad MAC address %s.\n",
				print_mac(mac, netdev->dev_addr));
	} else
		adapter->macaddr_set(adapter, netdev->dev_addr);

	return 0;
}

/*
 * 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, pci_len0 = 0;
	int i = 0, err;
	int first_driver, first_boot;
	u32 val;
	int pci_func_id = PCI_FUNC(pdev->devfn);
	struct netxen_legacy_intr_set *legacy_intrp;
	uint8_t revision_id;

	if (pci_func_id == 0)
		printk(KERN_INFO "%s\n", netxen_nic_driver_string);

	if (pdev->class != 0x020000) {
		printk(KERN_DEBUG "NetXen function %d, class %x will not "
				"be enabled.\n",pci_func_id, pdev->class);
		return -ENODEV;
	}

	if (pdev->revision >= NX_P3_A0 && pdev->revision < NX_P3_B1) {
		printk(KERN_WARNING "NetXen chip revisions between 0x%x-0x%x"
				"will not be enabled.\n",
				NX_P3_A0, NX_P3_B1);
		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);

	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->netdev  = netdev;
	adapter->pdev    = pdev;
	adapter->ahw.pci_func  = pci_func_id;

	revision_id = pdev->revision;
	adapter->ahw.revision_id = revision_id;

	err = nx_set_dma_mask(adapter, revision_id);
	if (err)
		goto err_out_free_netdev;

	rwlock_init(&adapter->adapter_lock);
	adapter->ahw.qdr_sn_window = -1;
	adapter->ahw.ddr_mn_window = -1;

	/* remap phys address */
	mem_base = pci_resource_start(pdev, 0);	/* 0 is for BAR 0 */
	mem_len = pci_resource_len(pdev, 0);
	pci_len0 = 0;

	adapter->hw_write_wx = netxen_nic_hw_write_wx_128M;
	adapter->hw_read_wx = netxen_nic_hw_read_wx_128M;
	adapter->pci_read_immediate = netxen_nic_pci_read_immediate_128M;
	adapter->pci_write_immediate = netxen_nic_pci_write_immediate_128M;
	adapter->pci_read_normalize = netxen_nic_pci_read_normalize_128M;
	adapter->pci_write_normalize = netxen_nic_pci_write_normalize_128M;
	adapter->pci_set_window = netxen_nic_pci_set_window_128M;
	adapter->pci_mem_read = netxen_nic_pci_mem_read_128M;
	adapter->pci_mem_write = netxen_nic_pci_mem_write_128M;

	/* 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 if (mem_len == NETXEN_PCI_2MB_SIZE) {
		adapter->hw_write_wx = netxen_nic_hw_write_wx_2M;
		adapter->hw_read_wx = netxen_nic_hw_read_wx_2M;
		adapter->pci_read_immediate = netxen_nic_pci_read_immediate_2M;
		adapter->pci_write_immediate =
			netxen_nic_pci_write_immediate_2M;
		adapter->pci_read_normalize = netxen_nic_pci_read_normalize_2M;
		adapter->pci_write_normalize =
			netxen_nic_pci_write_normalize_2M;
		adapter->pci_set_window = netxen_nic_pci_set_window_2M;
		adapter->pci_mem_read = netxen_nic_pci_mem_read_2M;
		adapter->pci_mem_write = netxen_nic_pci_mem_write_2M;

		mem_ptr0 = ioremap(mem_base, mem_len);
		pci_len0 = mem_len;
		first_page_group_start = 0;
		first_page_group_end   = 0;

		adapter->ahw.ddr_mn_window = 0;
		adapter->ahw.qdr_sn_window = 0;

		adapter->ahw.mn_win_crb = 0x100000 + PCIX_MN_WINDOW +
			(pci_func_id * 0x20);
		adapter->ahw.ms_win_crb = 0x100000 + PCIX_SN_WINDOW;
		if (pci_func_id < 4)
			adapter->ahw.ms_win_crb += (pci_func_id * 0x20);
		else
			adapter->ahw.ms_win_crb +=
					0xA0 + ((pci_func_id - 4) * 0x10);
	} else {
		err = -EIO;
		goto err_out_free_netdev;
	}

	dev_info(&pdev->dev, "%dMB memory map\n", (int)(mem_len>>20));

	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.pci_len0 = pci_len0;
	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;

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

	if (revision_id >= NX_P3_B0)
		legacy_intrp = &legacy_intr[pci_func_id];
	else
		legacy_intrp = &legacy_intr[0];

	adapter->legacy_intr.int_vec_bit = legacy_intrp->int_vec_bit;
	adapter->legacy_intr.tgt_status_reg = legacy_intrp->tgt_status_reg;
	adapter->legacy_intr.tgt_mask_reg = legacy_intrp->tgt_mask_reg;
	adapter->legacy_intr.pci_int_reg = legacy_intrp->pci_int_reg;

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

	/* This will be reset for mezz cards  */
	adapter->portnum = pci_func_id;
	adapter->status   &= ~NETXEN_NETDEV_STATUS;
	adapter->rx_csum = 1;
	adapter->mc_enabled = 0;
	if (NX_IS_REVISION_P3(revision_id))
		adapter->max_mc_count = 38;
	else
		adapter->max_mc_count = 16;

	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;
	if (NX_IS_REVISION_P3(revision_id))
		netdev->set_multicast_list = netxen_p3_nic_set_multi;
	else
		netdev->set_multicast_list = netxen_p2_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     = 2*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 (NX_IS_REVISION_P3(revision_id)) {
		netdev->features |= NETIF_F_IPV6_CSUM;
		netdev->features |= NETIF_F_TSO6;
	}

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

	/*
	 * 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;

	if (netxen_nic_get_board_info(adapter) != 0) {
		printk("%s: Error getting board config info.\n",
				netxen_nic_driver_name);
		err = -EIO;
		goto err_out_iounmap;
	}

	netxen_initialize_adapter_ops(adapter);

	/* Mezz cards have PCI function 0,2,3 enabled */
	switch (adapter->ahw.boardcfg.board_type) {
	case NETXEN_BRDTYPE_P2_SB31_10G_IMEZ:
	case NETXEN_BRDTYPE_P2_SB31_10G_HMEZ:
		if (pci_func_id >= 2)
			adapter->portnum = pci_func_id - 2;
		break;
	default:
		break;
	}

	/*
	 * This call will setup various max rx/tx counts.
	 * It must be done before any buffer/ring allocations.
	 */
	netxen_check_options(adapter);

	first_driver = 0;
	if (NX_IS_REVISION_P3(revision_id)) {
		if (adapter->ahw.pci_func == 0)
			first_driver = 1;
	} else {
		if (adapter->portnum == 0)
			first_driver = 1;
	}

	if (first_driver) {
		first_boot = adapter->pci_read_normalize(adapter,
				NETXEN_CAM_RAM(0x1fc));

		err = netxen_check_hw_init(adapter, first_boot);
		if (err) {
			printk(KERN_ERR "%s: error in init HW init sequence\n",
					netxen_nic_driver_name);
			goto err_out_iounmap;
		}

		if (NX_IS_REVISION_P3(revision_id))
			netxen_set_port_mode(adapter);

		if (first_boot != 0x55555555) {
			adapter->pci_write_normalize(adapter,
						CRB_CMDPEG_STATE, 0);
			netxen_pinit_from_rom(adapter, 0);
			msleep(1);
			netxen_load_firmware(adapter);
		}

		if (NX_IS_REVISION_P3(revision_id))
			netxen_pcie_strap_init(adapter);

		if (NX_IS_REVISION_P2(revision_id)) {

			/* Initialize multicast addr pool owners */
			val = 0x7654;
			if (adapter->ahw.board_type == NETXEN_NIC_XGBE)
				val |= 0x0f000000;
			netxen_crb_writelit_adapter(adapter,
					NETXEN_MAC_ADDR_CNTL_REG, val);

		}

		if ((first_boot == 0x55555555) &&
			(NX_IS_REVISION_P2(revision_id))) {
			/* Unlock the HW, prompting the boot sequence */
			adapter->pci_write_normalize(adapter,
					NETXEN_ROMUSB_GLB_PEGTUNE_DONE, 1);
		}

		err = netxen_initialize_adapter_offload(adapter);
		if (err)
			goto err_out_iounmap;

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

		/* Handshake with the card before we register the devices. */
		netxen_phantom_init(adapter, NETXEN_NIC_PEG_TUNE);

	}	/* first_driver */

	netxen_nic_flash_print(adapter);

	if (NX_IS_REVISION_P3(revision_id)) {
		adapter->hw_read_wx(adapter,
				NETXEN_MIU_MN_CONTROL, &val, 4);
		adapter->ahw.cut_through = (val & 0x4) ? 1 : 0;
		dev_info(&pdev->dev, "firmware running in %s mode\n",
		adapter->ahw.cut_through ? "cut through" : "legacy");
	}

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

	adapter->flags &= ~(NETXEN_NIC_MSI_ENABLED | NETXEN_NIC_MSIX_ENABLED);

	netxen_set_msix_bit(pdev, 0);

	if (NX_IS_REVISION_P3(revision_id)) {
		if ((mem_len != NETXEN_PCI_128MB_SIZE) &&
			mem_len != NETXEN_PCI_2MB_SIZE)
			adapter->msix_supported = 0;
	}

	if (adapter->msix_supported) {

		netxen_init_msix_entries(adapter);

		if (pci_enable_msix(pdev, adapter->msix_entries,
					MSIX_ENTRIES_PER_ADAPTER))
			goto request_msi;

		adapter->flags |= NETXEN_NIC_MSIX_ENABLED;
		netxen_set_msix_bit(pdev, 1);
		dev_info(&pdev->dev, "using msi-x interrupts\n");

	} else {
request_msi:
		if (use_msi && !pci_enable_msi(pdev)) {
			adapter->flags |= NETXEN_NIC_MSI_ENABLED;
			dev_info(&pdev->dev, "using msi interrupts\n");
		} else
			dev_info(&pdev->dev, "using legacy interrupts\n");
	}

	if (adapter->flags & NETXEN_NIC_MSIX_ENABLED)
		netdev->irq = adapter->msix_entries[0].vector;
	else
		netdev->irq = pdev->irq;

	err = netxen_receive_peg_ready(adapter);
	if (err)
		goto err_out_disable_msi;

	init_timer(&adapter->watchdog_timer);
	adapter->watchdog_timer.function = &netxen_watchdog;
	adapter->watchdog_timer.data = (unsigned long)adapter;
	INIT_WORK(&adapter->watchdog_task, netxen_watchdog_task);
	INIT_WORK(&adapter->tx_timeout_task, netxen_tx_timeout_task);

	err = netxen_read_mac_addr(adapter);
	if (err)
		dev_warn(&pdev->dev, "failed to read mac addr\n");

	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_disable_msi;
	}

	pci_set_drvdata(pdev, adapter);

	switch (adapter->ahw.board_type) {
	case NETXEN_NIC_GBE:
		dev_info(&adapter->pdev->dev, "%s: GbE port initialized\n",
				adapter->netdev->name);
		break;
	case NETXEN_NIC_XGBE:
		dev_info(&adapter->pdev->dev, "%s: XGbE port initialized\n",
				adapter->netdev->name);
		break;
	}

	return 0;

err_out_disable_msi:
	if (adapter->flags & NETXEN_NIC_MSIX_ENABLED)
		pci_disable_msix(pdev);
	if (adapter->flags & NETXEN_NIC_MSI_ENABLED)
		pci_disable_msi(pdev);

	if (first_driver)
		netxen_free_adapter_offload(adapter);

err_out_iounmap:
	if (db_ptr)
		iounmap(db_ptr);

	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_set_drvdata(pdev, NULL);
	pci_disable_device(pdev);
	return err;
}

static void __devexit netxen_nic_remove(struct pci_dev *pdev)
{
	struct netxen_adapter *adapter;
	struct net_device *netdev;

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

	netdev = adapter->netdev;

	unregister_netdev(netdev);

	if (adapter->is_up == NETXEN_ADAPTER_UP_MAGIC) {
		netxen_free_hw_resources(adapter);
		netxen_release_rx_buffers(adapter);
		netxen_free_sw_resources(adapter);
	}

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

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

	if (adapter->flags & NETXEN_NIC_MSIX_ENABLED)
		pci_disable_msix(pdev);
	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;
	irq_handler_t handler;
	unsigned long flags = IRQF_SAMPLE_RANDOM;

	if (adapter->driver_mismatch)
		return -EIO;

	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;
		}

		if (adapter->fw_major < 4)
			adapter->max_rds_rings = 3;
		else
			adapter->max_rds_rings = 2;

		err = netxen_alloc_sw_resources(adapter);
		if (err) {
			printk(KERN_ERR "%s: Error in setting sw resources\n",
					netdev->name);
			return err;
		}

		netxen_nic_clear_stats(adapter);

		err = netxen_alloc_hw_resources(adapter);
		if (err) {
			printk(KERN_ERR "%s: Error in setting hw resources\n",
					netdev->name);
			goto err_out_free_sw;
		}

		if ((adapter->msi_mode != MSI_MODE_MULTIFUNC) ||
			(adapter->intr_scheme != INTR_SCHEME_PERPORT)) {
			printk(KERN_ERR "%s: Firmware interrupt scheme is "
					"incompatible with driver\n",
					netdev->name);
			adapter->driver_mismatch = 1;
			goto err_out_free_hw;
		}

		if (adapter->fw_major < 4) {
			adapter->crb_addr_cmd_producer =
				crb_cmd_producer[adapter->portnum];
			adapter->crb_addr_cmd_consumer =
				crb_cmd_consumer[adapter->portnum];

			netxen_nic_update_cmd_producer(adapter, 0);
			netxen_nic_update_cmd_consumer(adapter, 0);
		}

		for (ctx = 0; ctx < MAX_RCV_CTX; ++ctx) {
			for (ring = 0; ring < adapter->max_rds_rings; ring++)
				netxen_post_rx_buffers(adapter, ctx, ring);
		}
		if (NETXEN_IS_MSI_FAMILY(adapter))
			handler = netxen_msi_intr;
		else {
			flags |= IRQF_SHARED;
			handler = netxen_intr;
		}
		adapter->irq = netdev->irq;
		err = request_irq(adapter->irq, handler,
				  flags, netdev->name, adapter);
		if (err) {
			printk(KERN_ERR "request_irq failed with: %d\n", err);
			goto err_out_free_rxbuf;
		}

		adapter->is_up = NETXEN_ADAPTER_UP_MAGIC;
	}

	/* Done here again so that even if phantom sw overwrote it,
	 * we set it */
	err = adapter->init_port(adapter, adapter->physical_port);
	if (err) {
		printk(KERN_ERR "%s: Failed to initialize port %d\n",
				netxen_nic_driver_name, adapter->portnum);
		goto err_out_free_irq;
	}
	adapter->macaddr_set(adapter, netdev->dev_addr);

	netxen_nic_set_link_parameters(adapter);

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

	adapter->ahw.linkup = 0;
	mod_timer(&adapter->watchdog_timer, jiffies);

	napi_enable(&adapter->napi);
	netxen_nic_enable_int(adapter);

	netif_start_queue(netdev);

	return 0;

err_out_free_irq:
	free_irq(adapter->irq, adapter);
err_out_free_rxbuf:
	netxen_release_rx_buffers(adapter);
err_out_free_hw:
	netxen_free_hw_resources(adapter);
err_out_free_sw:
	netxen_free_sw_resources(adapter);
	return err;
}

/*
 * 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);

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

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

	netxen_nic_disable_int(adapter);

	netxen_release_tx_buffers(adapter);

	FLUSH_SCHEDULED_WORK();
	del_timer_sync(&adapter->watchdog_timer);

	return 0;
}

void netxen_tso_check(struct netxen_adapter *adapter,
		      struct cmd_desc_type0 *desc, struct sk_buff *skb)
{
	if (desc->mss) {
		desc->total_hdr_length = (sizeof(struct ethhdr) +
					  ip_hdrlen(skb) + tcp_hdrlen(skb));

		if ((NX_IS_REVISION_P3(adapter->ahw.revision_id)) &&
				(skb->protocol == htons(ETH_P_IPV6)))
			netxen_set_cmd_desc_opcode(desc, TX_TCP_LSO6);
		else
			netxen_set_cmd_desc_opcode(desc, TX_TCP_LSO);

	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
		if (ip_hdr(skb)->protocol == IPPROTO_TCP)
			netxen_set_cmd_desc_opcode(desc, TX_TCP_PKT);
		else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
			netxen_set_cmd_desc_opcode(desc, TX_UDP_PKT);
		else
			return;
	}
	desc->tcp_hdr_offset = skb_transport_offset(skb);
	desc->ip_hdr_offset = skb_network_offset(skb);
}

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, consumer;
	u32 saved_producer = 0;
	struct cmd_desc_type0 *hwdesc;
	int k;
	struct netxen_cmd_buffer *pbuf = NULL;
	int frag_count;
	int no_of_desc;
	u32 num_txd = adapter->max_tx_desc_count;

	frag_count = skb_shinfo(skb)->nr_frags + 1;

	/* There 4 fragments per descriptor */
	no_of_desc = (frag_count + 3) >> 2;
	if (netdev->features & (NETIF_F_TSO | NETIF_F_TSO6)) {
		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++;
			}
		}
	}

	producer = adapter->cmd_producer;
	smp_mb();
	consumer = adapter->last_cmd_consumer;
	if ((no_of_desc+2) > find_diff_among(producer, consumer, num_txd)) {
		netif_stop_queue(netdev);
		smp_mb();
		return NETDEV_TX_BUSY;
	}

	/* Copy the descriptors into the hardware    */
	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 | NETIF_F_TSO6)) &&
			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, num_txd);
			hwdesc = &hw->cmd_desc_head[producer];
			memset(hwdesc, 0, sizeof(struct cmd_desc_type0));
			pbuf = &adapter->cmd_buf_arr[producer];
			pbuf->skb = NULL;
		}
		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;

		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, num_txd);

	/* 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];
		pbuf = &adapter->cmd_buf_arr[producer];
		pbuf->skb = NULL;

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

		if (more_hdr) {
			hwdesc = &hw->cmd_desc_head[producer];
			pbuf = &adapter->cmd_buf_arr[producer];
			pbuf->skb = NULL;
			/* 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, num_txd);
		}
	}

	adapter->cmd_producer = producer;
	adapter->stats.txbytes += skb->len;

	netxen_nic_update_cmd_producer(adapter, adapter->cmd_producer);

	adapter->stats.xmitcalled++;
	netdev->trans_start = jiffies;

	return NETDEV_TX_OK;
}

static int netxen_nic_check_temp(struct netxen_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	uint32_t temp, temp_state, temp_val;
	int rv = 0;

	temp = adapter->pci_read_normalize(adapter, CRB_TEMP_STATE);

	temp_state = nx_get_temp_state(temp);
	temp_val = nx_get_temp_val(temp);

	if (temp_state == NX_TEMP_PANIC) {
		printk(KERN_ALERT
		       "%s: Device temperature %d degrees C exceeds"
		       " maximum allowed. Hardware has been shut down.\n",
		       netxen_nic_driver_name, temp_val);

		netif_carrier_off(netdev);
		netif_stop_queue(netdev);
		rv = 1;
	} else if (temp_state == NX_TEMP_WARN) {
		if (adapter->temp == NX_TEMP_NORMAL) {
			printk(KERN_ALERT
			       "%s: Device temperature %d degrees C "
			       "exceeds operating range."
			       " Immediate action needed.\n",
			       netxen_nic_driver_name, temp_val);
		}
	} else {
		if (adapter->temp == NX_TEMP_WARN) {
			printk(KERN_INFO
			       "%s: Device temperature is now %d degrees C"
			       " in normal range.\n", netxen_nic_driver_name,
			       temp_val);
		}
	}
	adapter->temp = temp_state;
	return rv;
}

static void netxen_nic_handle_phy_intr(struct netxen_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	u32 val, port, linkup;

	port = adapter->physical_port;

	if (NX_IS_REVISION_P3(adapter->ahw.revision_id)) {
		val = adapter->pci_read_normalize(adapter, CRB_XG_STATE_P3);
		val = XG_LINK_STATE_P3(adapter->ahw.pci_func, val);
		linkup = (val == XG_LINK_UP_P3);
	} else {
		val = adapter->pci_read_normalize(adapter, CRB_XG_STATE);
		if (adapter->ahw.board_type == NETXEN_NIC_GBE)
			linkup = (val >> port) & 1;
		else {
			val = (val >> port*8) & 0xff;
			linkup = (val == XG_LINK_UP);
		}
	}

	if (adapter->ahw.linkup && !linkup) {
		printk(KERN_INFO "%s: %s NIC Link is down\n",
		       netxen_nic_driver_name, netdev->name);
		adapter->ahw.linkup = 0;
		if (netif_running(netdev)) {
			netif_carrier_off(netdev);
			netif_stop_queue(netdev);
		}
	} else if (!adapter->ahw.linkup && linkup) {
		printk(KERN_INFO "%s: %s NIC Link is up\n",
		       netxen_nic_driver_name, netdev->name);
		adapter->ahw.linkup = 1;
		if (netif_running(netdev)) {
			netif_carrier_on(netdev);
			netif_wake_queue(netdev);
		}
	}
}

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

	SCHEDULE_WORK(&adapter->watchdog_task);
}

void netxen_watchdog_task(struct work_struct *work)
{
	struct netxen_adapter *adapter =
		container_of(work, struct netxen_adapter, watchdog_task);

	if ((adapter->portnum  == 0) && netxen_nic_check_temp(adapter))
		return;

	netxen_nic_handle_phy_intr(adapter);

	if (netif_running(adapter->netdev))
		mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
}

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_disable_int(adapter);
	napi_disable(&adapter->napi);

	adapter->netdev->trans_start = jiffies;

	napi_enable(&adapter->napi);
	netxen_nic_enable_int(adapter);
	netif_wake_queue(adapter->netdev);
}

/*
 * netxen_nic_get_stats - Get System Network Statistics
 * @netdev: network interface device structure
 */
struct net_device_stats *netxen_nic_get_stats(struct net_device *netdev)
{
	struct netxen_adapter *adapter = netdev_priv(netdev);
	struct net_device_stats *stats = &adapter->net_stats;

	memset(stats, 0, sizeof(*stats));

	/* total packets received   */
	stats->rx_packets = adapter->stats.no_rcv;
	/* total packets transmitted    */
	stats->tx_packets = adapter->stats.xmitedframes +
		adapter->stats.xmitfinished;
	/* total bytes received     */
	stats->rx_bytes = adapter->stats.rxbytes;
	/* total bytes transmitted  */
	stats->tx_bytes = adapter->stats.txbytes;
	/* bad packets received     */
	stats->rx_errors = adapter->stats.rcvdbadskb;
	/* packet transmit problems */
	stats->tx_errors = adapter->stats.nocmddescriptor;
	/* no space in linux buffers    */
	stats->rx_dropped = adapter->stats.rxdropped;
	/* no space available in linux  */
	stats->tx_dropped = adapter->stats.txdropped;

	return stats;
}

static irqreturn_t netxen_intr(int irq, void *data)
{
	struct netxen_adapter *adapter = data;
	u32 status = 0;

	status = adapter->pci_read_immediate(adapter, ISR_INT_VECTOR);

	if (!(status & adapter->legacy_intr.int_vec_bit))
		return IRQ_NONE;

	if (adapter->ahw.revision_id >= NX_P3_B1) {
		/* check interrupt state machine, to be sure */
		status = adapter->pci_read_immediate(adapter,
				ISR_INT_STATE_REG);
		if (!ISR_LEGACY_INT_TRIGGERED(status))
			return IRQ_NONE;

	} else {
		unsigned long our_int = 0;

		our_int = adapter->pci_read_normalize(adapter, CRB_INT_VECTOR);

		/* not our interrupt */
		if (!test_and_clear_bit((7 + adapter->portnum), &our_int))
			return IRQ_NONE;

		/* claim interrupt */
		adapter->pci_write_normalize(adapter,
				CRB_INT_VECTOR, (our_int & 0xffffffff));
	}

	/* clear interrupt */
	if (adapter->fw_major < 4)
		netxen_nic_disable_int(adapter);

	adapter->pci_write_immediate(adapter,
			adapter->legacy_intr.tgt_status_reg,
			0xffffffff);
	/* read twice to ensure write is flushed */
	adapter->pci_read_immediate(adapter, ISR_INT_VECTOR);
	adapter->pci_read_immediate(adapter, ISR_INT_VECTOR);

	napi_schedule(&adapter->napi);

	return IRQ_HANDLED;
}

static irqreturn_t netxen_msi_intr(int irq, void *data)
{
	struct netxen_adapter *adapter = data;

	/* clear interrupt */
	adapter->pci_write_immediate(adapter,
			msi_tgt_status[adapter->ahw.pci_func], 0xffffffff);

	napi_schedule(&adapter->napi);
	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);
	int tx_complete;
	int ctx;
	int work_done;

	tx_complete = netxen_process_cmd_ring(adapter);

	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) && tx_complete) {
		netif_rx_complete(adapter->netdev, &adapter->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")) == NULL)
		return -ENOMEM;

	return pci_register_driver(&netxen_driver);
}

module_init(netxen_init_module);

static void __exit netxen_exit_module(void)
{
	pci_unregister_driver(&netxen_driver);
	destroy_workqueue(netxen_workq);
}

module_exit(netxen_exit_module);
OpenPOWER on IntegriCloud