summaryrefslogtreecommitdiffstats
path: root/sys/dev/e1000/if_igb.c
blob: 0924eda229f6828909814425e90c6a6c9b672a05 (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
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
/******************************************************************************

  Copyright (c) 2001-2009, Intel Corporation 
  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without 
  modification, are permitted provided that the following conditions are met:
  
   1. Redistributions of source code must retain the above copyright notice, 
      this list of conditions and the following disclaimer.
  
   2. Redistributions in binary form must reproduce the above copyright 
      notice, this list of conditions and the following disclaimer in the 
      documentation and/or other materials provided with the distribution.
  
   3. Neither the name of the Intel Corporation nor the names of its 
      contributors may be used to endorse or promote products derived from 
      this software without specific prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE.

******************************************************************************/
/*$FreeBSD$*/


#ifdef HAVE_KERNEL_OPTION_HEADERS
#include "opt_device_polling.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#if __FreeBSD_version >= 800000
#include <sys/buf_ring.h>
#endif
#include <sys/bus.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/taskqueue.h>
#include <sys/eventhandler.h>
#include <sys/pcpu.h>
#include <sys/smp.h>
#include <machine/smp.h>
#include <machine/bus.h>
#include <machine/resource.h>

#ifdef IGB_IEEE1588
#include <sys/ieee1588.h>
#endif

#include <net/bpf.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_media.h>

#include <net/if_types.h>
#include <net/if_vlan_var.h>

#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/tcp.h>
#include <netinet/tcp_lro.h>
#include <netinet/udp.h>

#include <machine/in_cksum.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>

#include "e1000_api.h"
#include "e1000_82575.h"
#include "if_igb.h"

/*********************************************************************
 *  Set this to one to display debug statistics
 *********************************************************************/
int	igb_display_debug_stats = 0;

/*********************************************************************
 *  Driver version:
 *********************************************************************/
char igb_driver_version[] = "version - 1.7.3";


/*********************************************************************
 *  PCI Device ID Table
 *
 *  Used by probe to select devices to load on
 *  Last field stores an index into e1000_strings
 *  Last entry must be all 0s
 *
 *  { Vendor ID, Device ID, SubVendor ID, SubDevice ID, String Index }
 *********************************************************************/

static igb_vendor_info_t igb_vendor_info_array[] =
{
	{ 0x8086, E1000_DEV_ID_82575EB_COPPER,	PCI_ANY_ID, PCI_ANY_ID, 0},
	{ 0x8086, E1000_DEV_ID_82575EB_FIBER_SERDES,
						PCI_ANY_ID, PCI_ANY_ID, 0},
	{ 0x8086, E1000_DEV_ID_82575GB_QUAD_COPPER,
						PCI_ANY_ID, PCI_ANY_ID, 0},
	{ 0x8086, E1000_DEV_ID_82576,		PCI_ANY_ID, PCI_ANY_ID, 0},
	{ 0x8086, E1000_DEV_ID_82576_NS,	PCI_ANY_ID, PCI_ANY_ID, 0},
	{ 0x8086, E1000_DEV_ID_82576_FIBER,	PCI_ANY_ID, PCI_ANY_ID, 0},
	{ 0x8086, E1000_DEV_ID_82576_SERDES,	PCI_ANY_ID, PCI_ANY_ID, 0},
	{ 0x8086, E1000_DEV_ID_82576_SERDES_QUAD,
						PCI_ANY_ID, PCI_ANY_ID, 0},
	{ 0x8086, E1000_DEV_ID_82576_QUAD_COPPER,
						PCI_ANY_ID, PCI_ANY_ID, 0},
	/* required last entry */
	{ 0, 0, 0, 0, 0}
};

/*********************************************************************
 *  Table of branding strings for all supported NICs.
 *********************************************************************/

static char *igb_strings[] = {
	"Intel(R) PRO/1000 Network Connection"
};

/*********************************************************************
 *  Function prototypes
 *********************************************************************/
static int	igb_probe(device_t);
static int	igb_attach(device_t);
static int	igb_detach(device_t);
static int	igb_shutdown(device_t);
static int	igb_suspend(device_t);
static int	igb_resume(device_t);
static void	igb_start(struct ifnet *);
static void	igb_start_locked(struct tx_ring *, struct ifnet *ifp);
#if __FreeBSD_version >= 800000
static int	igb_mq_start(struct ifnet *, struct mbuf *);
static int	igb_mq_start_locked(struct ifnet *,
		    struct tx_ring *, struct mbuf *);
static void	igb_qflush(struct ifnet *);
#endif
static int	igb_ioctl(struct ifnet *, u_long, caddr_t);
static void	igb_watchdog(struct adapter *);
static void	igb_init(void *);
static void	igb_init_locked(struct adapter *);
static void	igb_stop(void *);
static void	igb_media_status(struct ifnet *, struct ifmediareq *);
static int	igb_media_change(struct ifnet *);
static void	igb_identify_hardware(struct adapter *);
static int	igb_allocate_pci_resources(struct adapter *);
static int	igb_allocate_msix(struct adapter *);
static int	igb_allocate_legacy(struct adapter *);
static int	igb_setup_msix(struct adapter *);
static void	igb_free_pci_resources(struct adapter *);
static void	igb_local_timer(void *);
static int	igb_hardware_init(struct adapter *);
static void	igb_setup_interface(device_t, struct adapter *);
static int	igb_allocate_queues(struct adapter *);
static void	igb_configure_queues(struct adapter *);

static int	igb_allocate_transmit_buffers(struct tx_ring *);
static void	igb_setup_transmit_structures(struct adapter *);
static void	igb_setup_transmit_ring(struct tx_ring *);
static void	igb_initialize_transmit_units(struct adapter *);
static void	igb_free_transmit_structures(struct adapter *);
static void	igb_free_transmit_buffers(struct tx_ring *);

static int	igb_allocate_receive_buffers(struct rx_ring *);
static int	igb_setup_receive_structures(struct adapter *);
static int	igb_setup_receive_ring(struct rx_ring *);
static void	igb_initialize_receive_units(struct adapter *);
static void	igb_free_receive_structures(struct adapter *);
static void	igb_free_receive_buffers(struct rx_ring *);

static void	igb_enable_intr(struct adapter *);
static void	igb_disable_intr(struct adapter *);
static void	igb_update_stats_counters(struct adapter *);
static bool	igb_txeof(struct tx_ring *);
static bool	igb_rxeof(struct rx_ring *, int);
static void	igb_rx_checksum(u32, struct mbuf *, bool);
static int	igb_tx_ctx_setup(struct tx_ring *, struct mbuf *);
static bool	igb_tso_setup(struct tx_ring *, struct mbuf *, u32 *);
static void	igb_set_promisc(struct adapter *);
static void	igb_disable_promisc(struct adapter *);
static void	igb_set_multi(struct adapter *);
static void	igb_print_hw_stats(struct adapter *);
static void	igb_update_link_status(struct adapter *);
static int	igb_get_buf(struct rx_ring *, int, u8);

static void	igb_register_vlan(void *, struct ifnet *, u16);
static void	igb_unregister_vlan(void *, struct ifnet *, u16);
static void	igb_setup_vlan_hw_support(struct adapter *);

static int	igb_xmit(struct tx_ring *, struct mbuf **);
static int	igb_dma_malloc(struct adapter *, bus_size_t,
		    struct igb_dma_alloc *, int);
static void	igb_dma_free(struct adapter *, struct igb_dma_alloc *);
static void	igb_print_debug_info(struct adapter *);
static void	igb_print_nvm_info(struct adapter *);
static int 	igb_is_valid_ether_addr(u8 *);
static int	igb_sysctl_stats(SYSCTL_HANDLER_ARGS);
static int	igb_sysctl_debug_info(SYSCTL_HANDLER_ARGS);
/* Management and WOL Support */
static void	igb_init_manageability(struct adapter *);
static void	igb_release_manageability(struct adapter *);
static void     igb_get_hw_control(struct adapter *);
static void     igb_release_hw_control(struct adapter *);
static void     igb_enable_wakeup(device_t);

static int	igb_irq_fast(void *);
static void	igb_add_rx_process_limit(struct adapter *, const char *,
		    const char *, int *, int);
static void	igb_handle_rxtx(void *context, int pending);
static void	igb_handle_tx(void *context, int pending);
static void	igb_handle_rx(void *context, int pending);

/* These are MSIX only irq handlers */
static void	igb_msix_rx(void *);
static void	igb_msix_tx(void *);
static void	igb_msix_link(void *);

/* Adaptive Interrupt Moderation */
static void	igb_update_aim(struct rx_ring *);

/*********************************************************************
 *  FreeBSD Device Interface Entry Points
 *********************************************************************/

static device_method_t igb_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe, igb_probe),
	DEVMETHOD(device_attach, igb_attach),
	DEVMETHOD(device_detach, igb_detach),
	DEVMETHOD(device_shutdown, igb_shutdown),
	DEVMETHOD(device_suspend, igb_suspend),
	DEVMETHOD(device_resume, igb_resume),
	{0, 0}
};

static driver_t igb_driver = {
	"igb", igb_methods, sizeof(struct adapter),
};

static devclass_t igb_devclass;
DRIVER_MODULE(igb, pci, igb_driver, igb_devclass, 0, 0);
MODULE_DEPEND(igb, pci, 1, 1, 1);
MODULE_DEPEND(igb, ether, 1, 1, 1);

/*********************************************************************
 *  Tunable default values.
 *********************************************************************/

/* Descriptor defaults */
static int igb_rxd = IGB_DEFAULT_RXD;
static int igb_txd = IGB_DEFAULT_TXD;
TUNABLE_INT("hw.igb.rxd", &igb_rxd);
TUNABLE_INT("hw.igb.txd", &igb_txd);

/*
** These parameters are used in Adaptive
** Interrupt Moderation. The value is set
** into EITR and controls the interrupt
** frequency. A variable static scheme can
** be created by changing the assigned value
** of igb_ave_latency to the desired value,
** and then set igb_enable_aim to FALSE.
** This will result in all EITR registers
** getting set to that value statically.
*/
static int igb_enable_aim = TRUE;
TUNABLE_INT("hw.igb.enable_aim", &igb_enable_aim);
static int igb_low_latency = IGB_LOW_LATENCY;
TUNABLE_INT("hw.igb.low_latency", &igb_low_latency);
static int igb_ave_latency = IGB_AVE_LATENCY;
TUNABLE_INT("hw.igb.ave_latency", &igb_ave_latency);
static int igb_bulk_latency = IGB_BULK_LATENCY;
TUNABLE_INT("hw.igb.bulk_latency", &igb_bulk_latency);
                
/*
** This will autoconfigure based on the number
** of CPUs if set to 0. Only a matched pair of
** TX and RX rings are allowed.
*/
static int igb_num_queues = 1;
TUNABLE_INT("hw.igb.num_queues", &igb_num_queues);

/* How many packets rxeof tries to clean at a time */
static int igb_rx_process_limit = 100;
TUNABLE_INT("hw.igb.rx_process_limit", &igb_rx_process_limit);

/* Flow control setting - default to FULL */
static int igb_fc_setting = e1000_fc_full;
TUNABLE_INT("hw.igb.fc_setting", &igb_fc_setting);

/*
** Shadow VFTA table, this is needed because
** the real filter table gets cleared during
** a soft reset and the driver needs to be able
** to repopulate it.
*/
static u32 igb_shadow_vfta[IGB_VFTA_SIZE];


/*********************************************************************
 *  Device identification routine
 *
 *  igb_probe determines if the driver should be loaded on
 *  adapter based on PCI vendor/device id of the adapter.
 *
 *  return BUS_PROBE_DEFAULT on success, positive on failure
 *********************************************************************/

static int
igb_probe(device_t dev)
{
	char		adapter_name[60];
	uint16_t	pci_vendor_id = 0;
	uint16_t	pci_device_id = 0;
	uint16_t	pci_subvendor_id = 0;
	uint16_t	pci_subdevice_id = 0;
	igb_vendor_info_t *ent;

	INIT_DEBUGOUT("igb_probe: begin");

	pci_vendor_id = pci_get_vendor(dev);
	if (pci_vendor_id != IGB_VENDOR_ID)
		return (ENXIO);

	pci_device_id = pci_get_device(dev);
	pci_subvendor_id = pci_get_subvendor(dev);
	pci_subdevice_id = pci_get_subdevice(dev);

	ent = igb_vendor_info_array;
	while (ent->vendor_id != 0) {
		if ((pci_vendor_id == ent->vendor_id) &&
		    (pci_device_id == ent->device_id) &&

		    ((pci_subvendor_id == ent->subvendor_id) ||
		    (ent->subvendor_id == PCI_ANY_ID)) &&

		    ((pci_subdevice_id == ent->subdevice_id) ||
		    (ent->subdevice_id == PCI_ANY_ID))) {
			sprintf(adapter_name, "%s %s",
				igb_strings[ent->index],
				igb_driver_version);
			device_set_desc_copy(dev, adapter_name);
			return (BUS_PROBE_DEFAULT);
		}
		ent++;
	}

	return (ENXIO);
}

/*********************************************************************
 *  Device initialization routine
 *
 *  The attach entry point is called when the driver is being loaded.
 *  This routine identifies the type of hardware, allocates all resources
 *  and initializes the hardware.
 *
 *  return 0 on success, positive on failure
 *********************************************************************/

static int
igb_attach(device_t dev)
{
	struct adapter	*adapter;
	int		error = 0;
	u16		eeprom_data;

	INIT_DEBUGOUT("igb_attach: begin");

	adapter = device_get_softc(dev);
	adapter->dev = adapter->osdep.dev = dev;
	IGB_CORE_LOCK_INIT(adapter, device_get_nameunit(dev));

	/* SYSCTL stuff */
	SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
	    OID_AUTO, "debug", CTLTYPE_INT|CTLFLAG_RW, adapter, 0,
	    igb_sysctl_debug_info, "I", "Debug Information");

	SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
	    OID_AUTO, "stats", CTLTYPE_INT|CTLFLAG_RW, adapter, 0,
	    igb_sysctl_stats, "I", "Statistics");

	SYSCTL_ADD_INT(device_get_sysctl_ctx(adapter->dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(adapter->dev)),
	    OID_AUTO, "flow_control", CTLTYPE_INT|CTLFLAG_RW,
	    &igb_fc_setting, 0, "Flow Control");

	SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
	    OID_AUTO, "enable_aim", CTLTYPE_INT|CTLFLAG_RW,
	    &igb_enable_aim, 1, "Interrupt Moderation");

	SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
	    OID_AUTO, "low_latency", CTLTYPE_INT|CTLFLAG_RW,
	    &igb_low_latency, 1, "Low Latency");
                
	SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
	    OID_AUTO, "ave_latency", CTLTYPE_INT|CTLFLAG_RW,
	    &igb_ave_latency, 1, "Average Latency");

	SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
	    OID_AUTO, "bulk_latency", CTLTYPE_INT|CTLFLAG_RW,
	    &igb_bulk_latency, 1, "Bulk Latency");
 
	callout_init_mtx(&adapter->timer, &adapter->core_mtx, 0);

	/* Determine hardware and mac info */
	igb_identify_hardware(adapter);

	/* Setup PCI resources */
	if (igb_allocate_pci_resources(adapter)) {
		device_printf(dev, "Allocation of PCI resources failed\n");
		error = ENXIO;
		goto err_pci;
	}

	/* Do Shared Code initialization */
	if (e1000_setup_init_funcs(&adapter->hw, TRUE)) {
		device_printf(dev, "Setup of Shared code failed\n");
		error = ENXIO;
		goto err_pci;
	}

	e1000_get_bus_info(&adapter->hw);

	/* Sysctls for limiting the amount of work done in the taskqueue */
	igb_add_rx_process_limit(adapter, "rx_processing_limit",
	    "max number of rx packets to process", &adapter->rx_process_limit,
	    igb_rx_process_limit);

	/*
	 * Validate number of transmit and receive descriptors. It
	 * must not exceed hardware maximum, and must be multiple
	 * of E1000_DBA_ALIGN.
	 */
	if (((igb_txd * sizeof(struct e1000_tx_desc)) % IGB_DBA_ALIGN) != 0 ||
	    (igb_txd > IGB_MAX_TXD) || (igb_txd < IGB_MIN_TXD)) {
		device_printf(dev, "Using %d TX descriptors instead of %d!\n",
		    IGB_DEFAULT_TXD, igb_txd);
		adapter->num_tx_desc = IGB_DEFAULT_TXD;
	} else
		adapter->num_tx_desc = igb_txd;
	if (((igb_rxd * sizeof(struct e1000_rx_desc)) % IGB_DBA_ALIGN) != 0 ||
	    (igb_rxd > IGB_MAX_RXD) || (igb_rxd < IGB_MIN_RXD)) {
		device_printf(dev, "Using %d RX descriptors instead of %d!\n",
		    IGB_DEFAULT_RXD, igb_rxd);
		adapter->num_rx_desc = IGB_DEFAULT_RXD;
	} else
		adapter->num_rx_desc = igb_rxd;

	adapter->hw.mac.autoneg = DO_AUTO_NEG;
	adapter->hw.phy.autoneg_wait_to_complete = FALSE;
	adapter->hw.phy.autoneg_advertised = AUTONEG_ADV_DEFAULT;

	/* Copper options */
	if (adapter->hw.phy.media_type == e1000_media_type_copper) {
		adapter->hw.phy.mdix = AUTO_ALL_MODES;
		adapter->hw.phy.disable_polarity_correction = FALSE;
		adapter->hw.phy.ms_type = IGB_MASTER_SLAVE;
	}

	/*
	 * Set the frame limits assuming
	 * standard ethernet sized frames.
	 */
	adapter->max_frame_size = ETHERMTU + ETHER_HDR_LEN + ETHERNET_FCS_SIZE;
	adapter->min_frame_size = ETH_ZLEN + ETHERNET_FCS_SIZE;

	/*
	** Allocate and Setup Queues
	*/
	if (igb_allocate_queues(adapter)) {
		error = ENOMEM;
		goto err_pci;
	}

	/*
	** Start from a known state, this is
	** important in reading the nvm and
	** mac from that.
	*/
	e1000_reset_hw(&adapter->hw);

	/* Make sure we have a good EEPROM before we read from it */
	if (e1000_validate_nvm_checksum(&adapter->hw) < 0) {
		/*
		** Some PCI-E parts fail the first check due to
		** the link being in sleep state, call it again,
		** if it fails a second time its a real issue.
		*/
		if (e1000_validate_nvm_checksum(&adapter->hw) < 0) {
			device_printf(dev,
			    "The EEPROM Checksum Is Not Valid\n");
			error = EIO;
			goto err_late;
		}
	}

	/*
	** Copy the permanent MAC address out of the EEPROM
	*/
	if (e1000_read_mac_addr(&adapter->hw) < 0) {
		device_printf(dev, "EEPROM read error while reading MAC"
		    " address\n");
		error = EIO;
		goto err_late;
	}
	/* Check its sanity */
	if (!igb_is_valid_ether_addr(adapter->hw.mac.addr)) {
		device_printf(dev, "Invalid MAC address\n");
		error = EIO;
		goto err_late;
	}

	/* Now Initialize the hardware */
	if (igb_hardware_init(adapter)) {
		device_printf(dev, "Unable to initialize the hardware\n");
		error = EIO;
		goto err_late;
	}

	/* 
	** Configure Interrupts
	*/
	if (adapter->msix > 1) /* MSIX */
		error = igb_allocate_msix(adapter);
	else /* MSI or Legacy */
		error = igb_allocate_legacy(adapter);
	if (error)
		goto err_late;

	/* Setup OS specific network interface */
	igb_setup_interface(dev, adapter);

#ifdef IGB_IEEE1588
        /*
        ** Setup the timer: IEEE 1588 support
        */
        adapter->cycles.read = igb_read_clock;
        adapter->cycles.mask = (u64)-1;
        adapter->cycles.mult = 1;
        adapter->cycles.shift = IGB_TSYNC_SHIFT;
        E1000_WRITE_REG(&adapter->hw, E1000_TIMINCA, (1<<24) |
            IGB_TSYNC_CYCLE_TIME * IGB_TSYNC_SHIFT);
        E1000_WRITE_REG(&adapter->hw, E1000_SYSTIML, 0x00000000);
        E1000_WRITE_REG(&adapter->hw, E1000_SYSTIMH, 0xFF800000);

	// JFV - this is not complete yet
#endif

	/* Initialize statistics */
	igb_update_stats_counters(adapter);

	adapter->hw.mac.get_link_status = 1;
	igb_update_link_status(adapter);

	/* Indicate SOL/IDER usage */
	if (e1000_check_reset_block(&adapter->hw))
		device_printf(dev,
		    "PHY reset is blocked due to SOL/IDER session.\n");

	/* Determine if we have to control management hardware */
	adapter->has_manage = e1000_enable_mng_pass_thru(&adapter->hw);

	/*
	 * Setup Wake-on-Lan
	 */
	/* APME bit in EEPROM is mapped to WUC.APME */
	eeprom_data = E1000_READ_REG(&adapter->hw, E1000_WUC) & E1000_WUC_APME;
	if (eeprom_data)
		adapter->wol = E1000_WUFC_MAG;

	/* Register for VLAN events */
	adapter->vlan_attach = EVENTHANDLER_REGISTER(vlan_config,
	     igb_register_vlan, 0, EVENTHANDLER_PRI_FIRST);
	adapter->vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig,
	     igb_unregister_vlan, 0, EVENTHANDLER_PRI_FIRST);

	/* Tell the stack that the interface is not active */
	adapter->ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);

	INIT_DEBUGOUT("igb_attach: end");

	return (0);

err_late:
	igb_free_transmit_structures(adapter);
	igb_free_receive_structures(adapter);
	igb_release_hw_control(adapter);
err_pci:
	igb_free_pci_resources(adapter);
	IGB_CORE_LOCK_DESTROY(adapter);

	return (error);
}

/*********************************************************************
 *  Device removal routine
 *
 *  The detach entry point is called when the driver is being removed.
 *  This routine stops the adapter and deallocates all the resources
 *  that were allocated for driver operation.
 *
 *  return 0 on success, positive on failure
 *********************************************************************/

static int
igb_detach(device_t dev)
{
	struct adapter	*adapter = device_get_softc(dev);
	struct ifnet	*ifp = adapter->ifp;

	INIT_DEBUGOUT("igb_detach: begin");

	/* Make sure VLANS are not using driver */
	if (adapter->ifp->if_vlantrunk != NULL) {
		device_printf(dev,"Vlan in use, detach first\n");
		return (EBUSY);
	}

	IGB_CORE_LOCK(adapter);
	adapter->in_detach = 1;
	igb_stop(adapter);
	IGB_CORE_UNLOCK(adapter);

	e1000_phy_hw_reset(&adapter->hw);

	/* Give control back to firmware */
	igb_release_manageability(adapter);
	igb_release_hw_control(adapter);

	if (adapter->wol) {
		E1000_WRITE_REG(&adapter->hw, E1000_WUC, E1000_WUC_PME_EN);
		E1000_WRITE_REG(&adapter->hw, E1000_WUFC, adapter->wol);
		igb_enable_wakeup(dev);
	}

	/* Unregister VLAN events */
	if (adapter->vlan_attach != NULL)
		EVENTHANDLER_DEREGISTER(vlan_config, adapter->vlan_attach);
	if (adapter->vlan_detach != NULL)
		EVENTHANDLER_DEREGISTER(vlan_unconfig, adapter->vlan_detach);

	ether_ifdetach(adapter->ifp);

	callout_drain(&adapter->timer);

	igb_free_pci_resources(adapter);
	bus_generic_detach(dev);
	if_free(ifp);

	igb_free_transmit_structures(adapter);
	igb_free_receive_structures(adapter);

	IGB_CORE_LOCK_DESTROY(adapter);

	return (0);
}

/*********************************************************************
 *
 *  Shutdown entry point
 *
 **********************************************************************/

static int
igb_shutdown(device_t dev)
{
	return igb_suspend(dev);
}

/*
 * Suspend/resume device methods.
 */
static int
igb_suspend(device_t dev)
{
	struct adapter *adapter = device_get_softc(dev);

	IGB_CORE_LOCK(adapter);

	igb_stop(adapter);

        igb_release_manageability(adapter);
	igb_release_hw_control(adapter);

        if (adapter->wol) {
                E1000_WRITE_REG(&adapter->hw, E1000_WUC, E1000_WUC_PME_EN);
                E1000_WRITE_REG(&adapter->hw, E1000_WUFC, adapter->wol);
                igb_enable_wakeup(dev);
        }

	IGB_CORE_UNLOCK(adapter);

	return bus_generic_suspend(dev);
}

static int
igb_resume(device_t dev)
{
	struct adapter *adapter = device_get_softc(dev);
	struct ifnet *ifp = adapter->ifp;

	IGB_CORE_LOCK(adapter);
	igb_init_locked(adapter);
	igb_init_manageability(adapter);

	if ((ifp->if_flags & IFF_UP) &&
	    (ifp->if_drv_flags & IFF_DRV_RUNNING))
		igb_start(ifp);

	IGB_CORE_UNLOCK(adapter);

	return bus_generic_resume(dev);
}


/*********************************************************************
 *  Transmit entry point
 *
 *  igb_start is called by the stack to initiate a transmit.
 *  The driver will remain in this routine as long as there are
 *  packets to transmit and transmit resources are available.
 *  In case resources are not available stack is notified and
 *  the packet is requeued.
 **********************************************************************/

static void
igb_start_locked(struct tx_ring *txr, struct ifnet *ifp)
{
	struct adapter	*adapter = ifp->if_softc;
	struct mbuf	*m_head;

	IGB_TX_LOCK_ASSERT(txr);

	if ((ifp->if_drv_flags & (IFF_DRV_RUNNING|IFF_DRV_OACTIVE)) !=
	    IFF_DRV_RUNNING)
		return;
	if (!adapter->link_active)
		return;

	while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) {

		IFQ_DRV_DEQUEUE(&ifp->if_snd, m_head);
		if (m_head == NULL)
			break;
		/*
		 *  Encapsulation can modify our pointer, and or make it
		 *  NULL on failure.  In that event, we can't requeue.
		 */
		if (igb_xmit(txr, &m_head)) {
			if (m_head == NULL)
				break;
			ifp->if_drv_flags |= IFF_DRV_OACTIVE;
			IFQ_DRV_PREPEND(&ifp->if_snd, m_head);
			break;
		}

		/* Send a copy of the frame to the BPF listener */
		ETHER_BPF_MTAP(ifp, m_head);

		/* Set timeout in case hardware has problems transmitting. */
		txr->watchdog_timer = IGB_TX_TIMEOUT;
	}
}
 
/*
 * Legacy TX driver routine, called from the
 * stack, always uses tx[0], and spins for it.
 * Should not be used with multiqueue tx
 */
static void
igb_start(struct ifnet *ifp)
{
	struct adapter	*adapter = ifp->if_softc;
	struct tx_ring	*txr = adapter->tx_rings;

	if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
		IGB_TX_LOCK(txr);
		igb_start_locked(txr, ifp);
		IGB_TX_UNLOCK(txr);
	}
	return;
}

#if __FreeBSD_version >= 800000
/*
** Multiqueue Transmit driver
**
*/
static int
igb_mq_start(struct ifnet *ifp, struct mbuf *m)
{
	struct adapter	*adapter = ifp->if_softc;
	struct tx_ring	*txr;
	int 		i = 0, err = 0;

	/* Which queue to use */
	if ((m->m_flags & M_FLOWID) != 0)
		i = m->m_pkthdr.flowid % adapter->num_queues;
	txr = &adapter->tx_rings[i];

	if (IGB_TX_TRYLOCK(txr)) {
		err = igb_mq_start_locked(ifp, txr, m);
		IGB_TX_UNLOCK(txr);
	} else
		err = drbr_enqueue(ifp, txr->br, m);

	return (err);
}

static int
igb_mq_start_locked(struct ifnet *ifp, struct tx_ring *txr, struct mbuf *m)
{
	struct adapter  *adapter = txr->adapter;
        struct mbuf     *next;
        int             err = 0;

	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
		err = drbr_enqueue(ifp, txr->br, m);
		return (err);
	}

	if (m == NULL) /* Called by tasklet */
		goto process;

	/* If nothing queued go right to xmit */
	if (drbr_empty(ifp, txr->br)) {
		if (igb_xmit(txr, &m)) {
			if (m && (err = drbr_enqueue(ifp, txr->br, m)) != 0)
                                return (err);
		} else {
			/* Success, update stats */
			drbr_stats_update(ifp, m->m_pkthdr.len, m->m_flags);
			/* Send a copy of the frame to the BPF listener */
			ETHER_BPF_MTAP(ifp, m);
			/* Set the watchdog */
			txr->watchdog_timer = IGB_TX_TIMEOUT;
                }

        } else if ((err = drbr_enqueue(ifp, txr->br, m)) != 0)
		return (err);

process:
	if (drbr_empty(ifp, txr->br))
		return (err);

	/* Process the queue */
	while (TRUE) {
		if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
			break;
		next = drbr_dequeue(ifp, txr->br);
		if (next == NULL)
			break;
		if (igb_xmit(txr, &next))
			break;
		ETHER_BPF_MTAP(ifp, next);
		/* Set the watchdog */
		txr->watchdog_timer = IGB_TX_TIMEOUT;
	}
		
	if (txr->tx_avail <= IGB_TX_OP_THRESHOLD)
		ifp->if_drv_flags |= IFF_DRV_OACTIVE;

	return (err);
}

/*
** Flush all ring buffers
*/
static void
igb_qflush(struct ifnet *ifp)
{
	struct adapter	*adapter = ifp->if_softc;
	struct tx_ring	*txr = adapter->tx_rings;
	struct mbuf	*m;

	for (int i = 0; i < adapter->num_queues; i++, txr++) {
		IGB_TX_LOCK(txr);
		while ((m = buf_ring_dequeue_sc(txr->br)) != NULL)
			m_freem(m);
		IGB_TX_UNLOCK(txr);
	}
	if_qflush(ifp);
}
#endif /* __FreeBSD_version >= 800000 */

/*********************************************************************
 *  Ioctl entry point
 *
 *  igb_ioctl is called when the user wants to configure the
 *  interface.
 *
 *  return 0 on success, positive on failure
 **********************************************************************/

static int
igb_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
	struct adapter	*adapter = ifp->if_softc;
	struct ifreq *ifr = (struct ifreq *)data;
#ifdef INET
	struct ifaddr *ifa = (struct ifaddr *)data;
#endif
	int error = 0;

	if (adapter->in_detach)
		return (error);

	switch (command) {
	case SIOCSIFADDR:
#ifdef INET
		if (ifa->ifa_addr->sa_family == AF_INET) {
			/*
			 * XXX
			 * Since resetting hardware takes a very long time
			 * and results in link renegotiation we only
			 * initialize the hardware only when it is absolutely
			 * required.
			 */
			ifp->if_flags |= IFF_UP;
			if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
				IGB_CORE_LOCK(adapter);
				igb_init_locked(adapter);
				IGB_CORE_UNLOCK(adapter);
			}
			arp_ifinit(ifp, ifa);
		} else
#endif
			error = ether_ioctl(ifp, command, data);
		break;
	case SIOCSIFMTU:
	    {
		int max_frame_size;

		IOCTL_DEBUGOUT("ioctl rcv'd: SIOCSIFMTU (Set Interface MTU)");

		IGB_CORE_LOCK(adapter);
		max_frame_size = 9234;
		if (ifr->ifr_mtu > max_frame_size - ETHER_HDR_LEN -
		    ETHER_CRC_LEN) {
			IGB_CORE_UNLOCK(adapter);
			error = EINVAL;
			break;
		}

		ifp->if_mtu = ifr->ifr_mtu;
		adapter->max_frame_size =
		    ifp->if_mtu + ETHER_HDR_LEN + ETHER_CRC_LEN;
		igb_init_locked(adapter);
		IGB_CORE_UNLOCK(adapter);
		break;
	    }
	case SIOCSIFFLAGS:
		IOCTL_DEBUGOUT("ioctl rcv'd:\
		    SIOCSIFFLAGS (Set Interface Flags)");
		IGB_CORE_LOCK(adapter);
		if (ifp->if_flags & IFF_UP) {
			if ((ifp->if_drv_flags & IFF_DRV_RUNNING)) {
				if ((ifp->if_flags ^ adapter->if_flags) &
				    (IFF_PROMISC | IFF_ALLMULTI)) {
					igb_disable_promisc(adapter);
					igb_set_promisc(adapter);
				}
			} else
				igb_init_locked(adapter);
		} else
			if (ifp->if_drv_flags & IFF_DRV_RUNNING)
				igb_stop(adapter);
		adapter->if_flags = ifp->if_flags;
		IGB_CORE_UNLOCK(adapter);
		break;
	case SIOCADDMULTI:
	case SIOCDELMULTI:
		IOCTL_DEBUGOUT("ioctl rcv'd: SIOC(ADD|DEL)MULTI");
		if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
			IGB_CORE_LOCK(adapter);
			igb_disable_intr(adapter);
			igb_set_multi(adapter);
				igb_enable_intr(adapter);
			IGB_CORE_UNLOCK(adapter);
		}
		break;
	case SIOCSIFMEDIA:
		/* Check SOL/IDER usage */
		IGB_CORE_LOCK(adapter);
		if (e1000_check_reset_block(&adapter->hw)) {
			IGB_CORE_UNLOCK(adapter);
			device_printf(adapter->dev, "Media change is"
			    " blocked due to SOL/IDER session.\n");
			break;
		}
		IGB_CORE_UNLOCK(adapter);
	case SIOCGIFMEDIA:
		IOCTL_DEBUGOUT("ioctl rcv'd: \
		    SIOCxIFMEDIA (Get/Set Interface Media)");
		error = ifmedia_ioctl(ifp, ifr, &adapter->media, command);
		break;
	case SIOCSIFCAP:
	    {
		int mask, reinit;

		IOCTL_DEBUGOUT("ioctl rcv'd: SIOCSIFCAP (Set Capabilities)");
		reinit = 0;
		mask = ifr->ifr_reqcap ^ ifp->if_capenable;
		if (mask & IFCAP_HWCSUM) {
			ifp->if_capenable ^= IFCAP_HWCSUM;
			reinit = 1;
		}
		if (mask & IFCAP_TSO4) {
			ifp->if_capenable ^= IFCAP_TSO4;
			reinit = 1;
		}
		if (mask & IFCAP_VLAN_HWTAGGING) {
			ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING;
			reinit = 1;
		}
		if (mask & IFCAP_LRO) {
			ifp->if_capenable ^= IFCAP_LRO;
			reinit = 1;
		}
		if (reinit && (ifp->if_drv_flags & IFF_DRV_RUNNING))
			igb_init(adapter);
		VLAN_CAPABILITIES(ifp);
		break;
	    }

#ifdef IGB_IEEE1588
	/*
	** IOCTL support for Precision Time (IEEE 1588) Support
	*/
	case SIOCSHWTSTAMP:
		error = igb_hwtstamp_ioctl(adapter, ifp);
		break;
#endif

	default:
		error = ether_ioctl(ifp, command, data);
		break;
	}

	return (error);
}

/*********************************************************************
 *  Watchdog timer:
 *
 *  This routine is called from the local timer every second.
 *  As long as transmit descriptors are being cleaned the value
 *  is non-zero and we do nothing. Reaching 0 indicates a tx hang
 *  and we then reset the device.
 *
 **********************************************************************/

static void
igb_watchdog(struct adapter *adapter)
{
	struct tx_ring	*txr = adapter->tx_rings;
	bool		tx_hang = FALSE;

	IGB_CORE_LOCK_ASSERT(adapter);

	/*
	** The timer is set to 5 every time start() queues a packet.
	** Then txeof keeps resetting it as long as it cleans at
	** least one descriptor.
	** Finally, anytime all descriptors are clean the timer is
	** set to 0.
	**
	** With TX Multiqueue we need to check every queue's timer,
	** if any time out we do the reset.
	*/
	for (int i = 0; i < adapter->num_queues; i++, txr++) {
		IGB_TX_LOCK(txr);
		if (txr->watchdog_timer == 0 ||
		    (--txr->watchdog_timer)) {
			IGB_TX_UNLOCK(txr);
			continue;
		} else {
			tx_hang = TRUE;
			IGB_TX_UNLOCK(txr);
			break;
		}
	}
	if (tx_hang == FALSE)
		return;

	/* If we are in this routine because of pause frames, then
	 * don't reset the hardware.
	 */
	if (E1000_READ_REG(&adapter->hw, E1000_STATUS) &
	    E1000_STATUS_TXOFF) {
		txr = adapter->tx_rings; /* reset pointer */
		for (int i = 0; i < adapter->num_queues; i++, txr++) {
			IGB_TX_LOCK(txr);
			txr->watchdog_timer = IGB_TX_TIMEOUT;
			IGB_TX_UNLOCK(txr);
		}
		return;
	}

	if (e1000_check_for_link(&adapter->hw) == 0)
		device_printf(adapter->dev, "watchdog timeout -- resetting\n");

	for (int i = 0; i < adapter->num_queues; i++, txr++) {
		device_printf(adapter->dev, "Queue(%d) tdh = %d, tdt = %d\n",
		    i, E1000_READ_REG(&adapter->hw, E1000_TDH(i)),
		    E1000_READ_REG(&adapter->hw, E1000_TDT(i)));
		device_printf(adapter->dev, "Queue(%d) desc avail = %d,"
		    " Next Desc to Clean = %d\n", i, txr->tx_avail,
		    txr->next_to_clean);
	}

	adapter->ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
	adapter->watchdog_events++;

	igb_init_locked(adapter);
}

/*********************************************************************
 *  Init entry point
 *
 *  This routine is used in two ways. It is used by the stack as
 *  init entry point in network interface structure. It is also used
 *  by the driver as a hw/sw initialization routine to get to a
 *  consistent state.
 *
 *  return 0 on success, positive on failure
 **********************************************************************/

static void
igb_init_locked(struct adapter *adapter)
{
	struct rx_ring *rxr = adapter->rx_rings;
	struct tx_ring *txr = adapter->tx_rings;
	struct ifnet	*ifp = adapter->ifp;
	device_t	dev = adapter->dev;
	u32		pba = 0;

	INIT_DEBUGOUT("igb_init: begin");

	IGB_CORE_LOCK_ASSERT(adapter);

	igb_stop(adapter);

	/*
	 * Packet Buffer Allocation (PBA)
	 * Writing PBA sets the receive portion of the buffer
	 * the remainder is used for the transmit buffer.
	 */
	if (adapter->hw.mac.type == e1000_82575) {
		INIT_DEBUGOUT1("igb_init: pba=%dK",pba);
		pba = E1000_PBA_32K; /* 32K for Rx, 16K for Tx */
		E1000_WRITE_REG(&adapter->hw, E1000_PBA, pba);
	}
	
	/* Get the latest mac address, User can use a LAA */
        bcopy(IF_LLADDR(adapter->ifp), adapter->hw.mac.addr,
              ETHER_ADDR_LEN);

	/* Put the address into the Receive Address Array */
	e1000_rar_set(&adapter->hw, adapter->hw.mac.addr, 0);

	/* Initialize the hardware */
	if (igb_hardware_init(adapter)) {
		device_printf(dev, "Unable to initialize the hardware\n");
		return;
	}
	igb_update_link_status(adapter);

	E1000_WRITE_REG(&adapter->hw, E1000_VET, ETHERTYPE_VLAN);

	/* Set hardware offload abilities */
	ifp->if_hwassist = 0;
	if (ifp->if_capenable & IFCAP_TXCSUM) {
		ifp->if_hwassist |= (CSUM_TCP | CSUM_UDP);
#if __FreeBSD_version >= 800000
		if (adapter->hw.mac.type == e1000_82576)
			ifp->if_hwassist |= CSUM_SCTP;
#endif
	}

	if (ifp->if_capenable & IFCAP_TSO4)
		ifp->if_hwassist |= CSUM_TSO;

	/* Configure for OS presence */
	igb_init_manageability(adapter);

	/* Prepare transmit descriptors and buffers */
	igb_setup_transmit_structures(adapter);
	igb_initialize_transmit_units(adapter);

	/* Setup Multicast table */
	igb_set_multi(adapter);

	/*
	** Figure out the desired mbuf pool
	** for doing jumbo/packetsplit
	*/
	if (ifp->if_mtu > ETHERMTU)
		adapter->rx_mbuf_sz = MJUMPAGESIZE;
	else
		adapter->rx_mbuf_sz = MCLBYTES;

	/* Prepare receive descriptors and buffers */
	if (igb_setup_receive_structures(adapter)) {
		device_printf(dev, "Could not setup receive structures\n");
		igb_stop(adapter);
		return;
	}
	igb_initialize_receive_units(adapter);

	/* Don't lose promiscuous settings */
	igb_set_promisc(adapter);

	ifp->if_drv_flags |= IFF_DRV_RUNNING;
	ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;

	callout_reset(&adapter->timer, hz, igb_local_timer, adapter);
	e1000_clear_hw_cntrs_base_generic(&adapter->hw);

	if (adapter->msix > 1) /* Set up queue routing */
		igb_configure_queues(adapter);

	/* Set up VLAN tag offload and filter */
	igb_setup_vlan_hw_support(adapter);

        /* Set default RX interrupt moderation */
	for (int i = 0; i < adapter->num_queues; i++, rxr++) {
		E1000_WRITE_REG(&adapter->hw,
		    E1000_EITR(rxr->msix), igb_ave_latency);
		rxr->eitr_setting = igb_ave_latency;
	}

	/* Set TX interrupt rate & reset TX watchdog */
	for (int i = 0; i < adapter->num_queues; i++, txr++) {
		E1000_WRITE_REG(&adapter->hw, 
		    E1000_EITR(txr->msix), igb_ave_latency);
		txr->watchdog_timer = FALSE;
	}

	{
		/* this clears any pending interrupts */
		E1000_READ_REG(&adapter->hw, E1000_ICR);
		igb_enable_intr(adapter);
		E1000_WRITE_REG(&adapter->hw, E1000_ICS, E1000_ICS_LSC);
	}

	/* Don't reset the phy next time init gets called */
	adapter->hw.phy.reset_disable = TRUE;
}

static void
igb_init(void *arg)
{
	struct adapter *adapter = arg;

	IGB_CORE_LOCK(adapter);
	igb_init_locked(adapter);
	IGB_CORE_UNLOCK(adapter);
}


static void
igb_handle_rxtx(void *context, int pending)
{
	struct adapter	*adapter = context;
	struct tx_ring	*txr = adapter->tx_rings;
	struct rx_ring	*rxr = adapter->rx_rings;
	struct ifnet	*ifp;

	ifp = adapter->ifp;

	if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
		if (igb_rxeof(rxr, adapter->rx_process_limit))
			taskqueue_enqueue(adapter->tq, &adapter->rxtx_task);
		IGB_TX_LOCK(txr);
		igb_txeof(txr);

#if __FreeBSD_version >= 800000
		if (!drbr_empty(ifp, txr->br))
			igb_mq_start_locked(ifp, txr, NULL);
#else
		if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
			igb_start_locked(txr, ifp);
#endif
		IGB_TX_UNLOCK(txr);
	}

	igb_enable_intr(adapter);
}

static void
igb_handle_rx(void *context, int pending)
{
	struct rx_ring  *rxr = context;
	struct adapter  *adapter = rxr->adapter;
	struct ifnet    *ifp = adapter->ifp;
            
	if (ifp->if_drv_flags & IFF_DRV_RUNNING)
		if (igb_rxeof(rxr, adapter->rx_process_limit) != 0)
			/* More to clean, schedule another task */
			taskqueue_enqueue(adapter->tq, &rxr->rx_task);
                
}

static void
igb_handle_tx(void *context, int pending)
{
	struct tx_ring  *txr = context;
	struct adapter  *adapter = txr->adapter;
	struct ifnet    *ifp = adapter->ifp;

	if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
		IGB_TX_LOCK(txr);
		igb_txeof(txr);
#if __FreeBSD_version >= 800000
		if (!drbr_empty(ifp, txr->br))
			igb_mq_start_locked(ifp, txr, NULL);
#else
		if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
			igb_start_locked(txr, ifp);
#endif
		IGB_TX_UNLOCK(txr);
	}
}


/*********************************************************************
 *
 *  MSI/Legacy Deferred
 *  Interrupt Service routine  
 *
 *********************************************************************/
static int
igb_irq_fast(void *arg)
{
	struct adapter	*adapter = arg;
	uint32_t	reg_icr;


	reg_icr = E1000_READ_REG(&adapter->hw, E1000_ICR);

	/* Hot eject?  */
	if (reg_icr == 0xffffffff)
		return FILTER_STRAY;

	/* Definitely not our interrupt.  */
	if (reg_icr == 0x0)
		return FILTER_STRAY;

	if ((reg_icr & E1000_ICR_INT_ASSERTED) == 0)
		return FILTER_STRAY;

	/*
	 * Mask interrupts until the taskqueue is finished running.  This is
	 * cheap, just assume that it is needed.  This also works around the
	 * MSI message reordering errata on certain systems.
	 */
	igb_disable_intr(adapter);
	taskqueue_enqueue(adapter->tq, &adapter->rxtx_task);

	/* Link status change */
	if (reg_icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
		adapter->hw.mac.get_link_status = 1;
		igb_update_link_status(adapter);
	}

	if (reg_icr & E1000_ICR_RXO)
		adapter->rx_overruns++;
	return FILTER_HANDLED;
}


/*********************************************************************
 *
 *  MSIX TX Interrupt Service routine
 *
 **********************************************************************/
static void
igb_msix_tx(void *arg)
{
	struct tx_ring *txr = arg;
	struct adapter *adapter = txr->adapter;
	u32		loop = IGB_MAX_LOOP;
	bool		more;

	++txr->tx_irq;
	IGB_TX_LOCK(txr);

	do {
		more = igb_txeof(txr);
	} while (loop-- && more);

	IGB_TX_UNLOCK(txr);

	/* Schedule a clean task */
	taskqueue_enqueue(adapter->tq, &txr->tx_task);

	/* Reenable this interrupt */
	E1000_WRITE_REG(&adapter->hw, E1000_EIMS, txr->eims);
	return;
}

/*********************************************************************
 *
 *  MSIX RX Interrupt Service routine
 *
 **********************************************************************/

static void
igb_msix_rx(void *arg)
{
	struct rx_ring *rxr = arg;
	struct adapter *adapter = rxr->adapter;
	u32		loop = IGB_MAX_LOOP;
	bool		more;

	++rxr->rx_irq;
	do {
		more = igb_rxeof(rxr, adapter->rx_process_limit);
	} while (loop-- && more);

	/* Update interrupt rate */
	if (igb_enable_aim == TRUE)
		igb_update_aim(rxr);

	/* Schedule another clean */
	taskqueue_enqueue(adapter->tq, &rxr->rx_task);

	/* Reenable this interrupt */
	E1000_WRITE_REG(&adapter->hw, E1000_EIMS, rxr->eims);
	return;
}


/*********************************************************************
 *
 *  MSIX Link Interrupt Service routine
 *
 **********************************************************************/

static void
igb_msix_link(void *arg)
{
	struct adapter	*adapter = arg;
	u32       	icr;

	++adapter->link_irq;
	icr = E1000_READ_REG(&adapter->hw, E1000_ICR);
	if (!(icr & E1000_ICR_LSC))
		goto spurious;
	adapter->hw.mac.get_link_status = 1;
	igb_update_link_status(adapter);

spurious:
	/* Rearm */
	E1000_WRITE_REG(&adapter->hw, E1000_IMS, E1000_IMS_LSC);
	E1000_WRITE_REG(&adapter->hw, E1000_EIMS, adapter->link_mask);
	return;
}


/*
** Routine to adjust the RX EITR value based on traffic,
** its a simple three state model, but seems to help.
**
** Note that the three EITR values are tuneable using
** sysctl in real time. The feature can be effectively
** nullified by setting them equal.
*/
#define BULK_THRESHOLD	10000
#define AVE_THRESHOLD	1600 

static void
igb_update_aim(struct rx_ring *rxr)
{
	struct adapter	*adapter = rxr->adapter;
	u32		olditr, newitr;

	/* Update interrupt moderation based on traffic */
	olditr = rxr->eitr_setting;
	newitr = olditr;

	/* Idle, don't change setting */
	if (rxr->bytes == 0)
		return;

	if (olditr == igb_low_latency) {
		if (rxr->bytes > AVE_THRESHOLD)
			newitr = igb_ave_latency;
	} else if (olditr == igb_ave_latency) {
		if (rxr->bytes < AVE_THRESHOLD) 
			newitr = igb_low_latency;
		else if (rxr->bytes > BULK_THRESHOLD)
			newitr = igb_bulk_latency;
	} else if (olditr == igb_bulk_latency) {
		if (rxr->bytes < BULK_THRESHOLD)
			newitr = igb_ave_latency;
	}

	if (olditr != newitr) {
		/* Change interrupt rate */
		rxr->eitr_setting = newitr;
		E1000_WRITE_REG(&adapter->hw, E1000_EITR(rxr->me),
		    newitr | (newitr << 16));
	}

	rxr->bytes = 0;
        return;
}


/*********************************************************************
 *
 *  Media Ioctl callback
 *
 *  This routine is called whenever the user queries the status of
 *  the interface using ifconfig.
 *
 **********************************************************************/
static void
igb_media_status(struct ifnet *ifp, struct ifmediareq *ifmr)
{
	struct adapter *adapter = ifp->if_softc;
	u_char fiber_type = IFM_1000_SX;

	INIT_DEBUGOUT("igb_media_status: begin");

	IGB_CORE_LOCK(adapter);
	igb_update_link_status(adapter);

	ifmr->ifm_status = IFM_AVALID;
	ifmr->ifm_active = IFM_ETHER;

	if (!adapter->link_active) {
		IGB_CORE_UNLOCK(adapter);
		return;
	}

	ifmr->ifm_status |= IFM_ACTIVE;

	if ((adapter->hw.phy.media_type == e1000_media_type_fiber) ||
	    (adapter->hw.phy.media_type == e1000_media_type_internal_serdes))
		ifmr->ifm_active |= fiber_type | IFM_FDX;
	else {
		switch (adapter->link_speed) {
		case 10:
			ifmr->ifm_active |= IFM_10_T;
			break;
		case 100:
			ifmr->ifm_active |= IFM_100_TX;
			break;
		case 1000:
			ifmr->ifm_active |= IFM_1000_T;
			break;
		}
		if (adapter->link_duplex == FULL_DUPLEX)
			ifmr->ifm_active |= IFM_FDX;
		else
			ifmr->ifm_active |= IFM_HDX;
	}
	IGB_CORE_UNLOCK(adapter);
}

/*********************************************************************
 *
 *  Media Ioctl callback
 *
 *  This routine is called when the user changes speed/duplex using
 *  media/mediopt option with ifconfig.
 *
 **********************************************************************/
static int
igb_media_change(struct ifnet *ifp)
{
	struct adapter *adapter = ifp->if_softc;
	struct ifmedia  *ifm = &adapter->media;

	INIT_DEBUGOUT("igb_media_change: begin");

	if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
		return (EINVAL);

	IGB_CORE_LOCK(adapter);
	switch (IFM_SUBTYPE(ifm->ifm_media)) {
	case IFM_AUTO:
		adapter->hw.mac.autoneg = DO_AUTO_NEG;
		adapter->hw.phy.autoneg_advertised = AUTONEG_ADV_DEFAULT;
		break;
	case IFM_1000_LX:
	case IFM_1000_SX:
	case IFM_1000_T:
		adapter->hw.mac.autoneg = DO_AUTO_NEG;
		adapter->hw.phy.autoneg_advertised = ADVERTISE_1000_FULL;
		break;
	case IFM_100_TX:
		adapter->hw.mac.autoneg = FALSE;
		adapter->hw.phy.autoneg_advertised = 0;
		if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX)
			adapter->hw.mac.forced_speed_duplex = ADVERTISE_100_FULL;
		else
			adapter->hw.mac.forced_speed_duplex = ADVERTISE_100_HALF;
		break;
	case IFM_10_T:
		adapter->hw.mac.autoneg = FALSE;
		adapter->hw.phy.autoneg_advertised = 0;
		if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX)
			adapter->hw.mac.forced_speed_duplex = ADVERTISE_10_FULL;
		else
			adapter->hw.mac.forced_speed_duplex = ADVERTISE_10_HALF;
		break;
	default:
		device_printf(adapter->dev, "Unsupported media type\n");
	}

	/* As the speed/duplex settings my have changed we need to
	 * reset the PHY.
	 */
	adapter->hw.phy.reset_disable = FALSE;

	igb_init_locked(adapter);
	IGB_CORE_UNLOCK(adapter);

	return (0);
}


/*********************************************************************
 *
 *  This routine maps the mbufs to Advanced TX descriptors.
 *  used by the 82575 adapter.
 *  
 **********************************************************************/

static int
igb_xmit(struct tx_ring *txr, struct mbuf **m_headp)
{
	struct adapter		*adapter = txr->adapter;
	bus_dma_segment_t	segs[IGB_MAX_SCATTER];
	bus_dmamap_t		map;
	struct igb_tx_buffer	*tx_buffer, *tx_buffer_mapped;
	union e1000_adv_tx_desc	*txd = NULL;
	struct mbuf		*m_head;
	u32			olinfo_status = 0, cmd_type_len = 0;
	int			nsegs, i, j, error, first, last = 0;
	u32			hdrlen = 0;

	m_head = *m_headp;


	/* Set basic descriptor constants */
	cmd_type_len |= E1000_ADVTXD_DTYP_DATA;
	cmd_type_len |= E1000_ADVTXD_DCMD_IFCS | E1000_ADVTXD_DCMD_DEXT;
	if (m_head->m_flags & M_VLANTAG)
		cmd_type_len |= E1000_ADVTXD_DCMD_VLE;

        /*
         * Force a cleanup if number of TX descriptors
         * available hits the threshold
         */
	if (txr->tx_avail <= IGB_TX_CLEANUP_THRESHOLD) {
		igb_txeof(txr);
		/* Now do we at least have a minimal? */
		if (txr->tx_avail <= IGB_TX_OP_THRESHOLD) {
			txr->no_desc_avail++;
			return (ENOBUFS);
		}
	}

	/*
         * Map the packet for DMA.
	 *
	 * Capture the first descriptor index,
	 * this descriptor will have the index
	 * of the EOP which is the only one that
	 * now gets a DONE bit writeback.
	 */
	first = txr->next_avail_desc;
	tx_buffer = &txr->tx_buffers[first];
	tx_buffer_mapped = tx_buffer;
	map = tx_buffer->map;

	error = bus_dmamap_load_mbuf_sg(txr->txtag, map,
	    *m_headp, segs, &nsegs, BUS_DMA_NOWAIT);

	if (error == EFBIG) {
		struct mbuf *m;

		m = m_defrag(*m_headp, M_DONTWAIT);
		if (m == NULL) {
			adapter->mbuf_defrag_failed++;
			m_freem(*m_headp);
			*m_headp = NULL;
			return (ENOBUFS);
		}
		*m_headp = m;

		/* Try it again */
		error = bus_dmamap_load_mbuf_sg(txr->txtag, map,
		    *m_headp, segs, &nsegs, BUS_DMA_NOWAIT);

		if (error == ENOMEM) {
			adapter->no_tx_dma_setup++;
			return (error);
		} else if (error != 0) {
			adapter->no_tx_dma_setup++;
			m_freem(*m_headp);
			*m_headp = NULL;
			return (error);
		}
	} else if (error == ENOMEM) {
		adapter->no_tx_dma_setup++;
		return (error);
	} else if (error != 0) {
		adapter->no_tx_dma_setup++;
		m_freem(*m_headp);
		*m_headp = NULL;
		return (error);
	}

	/* Check again to be sure we have enough descriptors */
        if (nsegs > (txr->tx_avail - 2)) {
                txr->no_desc_avail++;
		bus_dmamap_unload(txr->txtag, map);
		return (ENOBUFS);
        }
	m_head = *m_headp;

        /*
         * Set up the context descriptor:
         * used when any hardware offload is done.
	 * This includes CSUM, VLAN, and TSO. It
	 * will use the first descriptor.
         */
        if (m_head->m_pkthdr.csum_flags & CSUM_TSO) {
		if (igb_tso_setup(txr, m_head, &hdrlen)) {
			cmd_type_len |= E1000_ADVTXD_DCMD_TSE;
			olinfo_status |= E1000_TXD_POPTS_IXSM << 8;
			olinfo_status |= E1000_TXD_POPTS_TXSM << 8;
		} else
			return (ENXIO); 
	} else if (igb_tx_ctx_setup(txr, m_head))
		olinfo_status |= E1000_TXD_POPTS_TXSM << 8;

#ifdef IGB_IEEE1588
	/* This is changing soon to an mtag detection */
	if (we detect this mbuf has a TSTAMP mtag)
		cmd_type_len |= E1000_ADVTXD_MAC_TSTAMP;
#endif
	/* Calculate payload length */
	olinfo_status |= ((m_head->m_pkthdr.len - hdrlen)
	    << E1000_ADVTXD_PAYLEN_SHIFT);

	/* Set up our transmit descriptors */
	i = txr->next_avail_desc;
	for (j = 0; j < nsegs; j++) {
		bus_size_t seg_len;
		bus_addr_t seg_addr;

		tx_buffer = &txr->tx_buffers[i];
		txd = (union e1000_adv_tx_desc *)&txr->tx_base[i];
		seg_addr = segs[j].ds_addr;
		seg_len  = segs[j].ds_len;

		txd->read.buffer_addr = htole64(seg_addr);
		txd->read.cmd_type_len = htole32(
		    adapter->txd_cmd | cmd_type_len | seg_len);
		txd->read.olinfo_status = htole32(olinfo_status);
		last = i;
		if (++i == adapter->num_tx_desc)
			i = 0;
		tx_buffer->m_head = NULL;
		tx_buffer->next_eop = -1;
	}

	txr->next_avail_desc = i;
	txr->tx_avail -= nsegs;

        tx_buffer->m_head = m_head;
	tx_buffer_mapped->map = tx_buffer->map;
	tx_buffer->map = map;
        bus_dmamap_sync(txr->txtag, map, BUS_DMASYNC_PREWRITE);

        /*
         * Last Descriptor of Packet
	 * needs End Of Packet (EOP)
	 * and Report Status (RS)
         */
        txd->read.cmd_type_len |=
	    htole32(E1000_TXD_CMD_EOP | E1000_TXD_CMD_RS);
	/*
	 * Keep track in the first buffer which
	 * descriptor will be written back
	 */
	tx_buffer = &txr->tx_buffers[first];
	tx_buffer->next_eop = last;

	/*
	 * Advance the Transmit Descriptor Tail (TDT), this tells the E1000
	 * that this frame is available to transmit.
	 */
	bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
	    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
	E1000_WRITE_REG(&adapter->hw, E1000_TDT(txr->me), i);
	++txr->tx_packets;

	return (0);

}

static void
igb_set_promisc(struct adapter *adapter)
{
	struct ifnet	*ifp = adapter->ifp;
	uint32_t	reg_rctl;

	reg_rctl = E1000_READ_REG(&adapter->hw, E1000_RCTL);

	if (ifp->if_flags & IFF_PROMISC) {
		reg_rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
		E1000_WRITE_REG(&adapter->hw, E1000_RCTL, reg_rctl);
	} else if (ifp->if_flags & IFF_ALLMULTI) {
		reg_rctl |= E1000_RCTL_MPE;
		reg_rctl &= ~E1000_RCTL_UPE;
		E1000_WRITE_REG(&adapter->hw, E1000_RCTL, reg_rctl);
	}
}

static void
igb_disable_promisc(struct adapter *adapter)
{
	uint32_t	reg_rctl;

	reg_rctl = E1000_READ_REG(&adapter->hw, E1000_RCTL);

	reg_rctl &=  (~E1000_RCTL_UPE);
	reg_rctl &=  (~E1000_RCTL_MPE);
	E1000_WRITE_REG(&adapter->hw, E1000_RCTL, reg_rctl);
}


/*********************************************************************
 *  Multicast Update
 *
 *  This routine is called whenever multicast address list is updated.
 *
 **********************************************************************/

static void
igb_set_multi(struct adapter *adapter)
{
	struct ifnet	*ifp = adapter->ifp;
	struct ifmultiaddr *ifma;
	u32 reg_rctl = 0;
	u8  mta[MAX_NUM_MULTICAST_ADDRESSES * ETH_ADDR_LEN];

	int mcnt = 0;

	IOCTL_DEBUGOUT("igb_set_multi: begin");

	if_maddr_rlock(ifp);
	TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
		if (ifma->ifma_addr->sa_family != AF_LINK)
			continue;

		if (mcnt == MAX_NUM_MULTICAST_ADDRESSES)
			break;

		bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
		    &mta[mcnt * ETH_ADDR_LEN], ETH_ADDR_LEN);
		mcnt++;
	}
	if_maddr_runlock(ifp);

	if (mcnt >= MAX_NUM_MULTICAST_ADDRESSES) {
		reg_rctl = E1000_READ_REG(&adapter->hw, E1000_RCTL);
		reg_rctl |= E1000_RCTL_MPE;
		E1000_WRITE_REG(&adapter->hw, E1000_RCTL, reg_rctl);
	} else
		e1000_update_mc_addr_list(&adapter->hw, mta, mcnt);
}


/*********************************************************************
 *  Timer routine
 *
 *  This routine checks for link status and updates statistics.
 *
 **********************************************************************/

static void
igb_local_timer(void *arg)
{
	struct adapter	*adapter = arg;
	struct ifnet	*ifp = adapter->ifp;

	IGB_CORE_LOCK_ASSERT(adapter);

	igb_update_link_status(adapter);
	igb_update_stats_counters(adapter);

	if (igb_display_debug_stats && ifp->if_drv_flags & IFF_DRV_RUNNING)
		igb_print_hw_stats(adapter);

	/*
	 * Each second we check the watchdog to 
	 * protect against hardware hangs.
	 */
	igb_watchdog(adapter);

	/* Trigger an RX interrupt on all queues */
	E1000_WRITE_REG(&adapter->hw, E1000_EICS, adapter->rx_mask);
 
	callout_reset(&adapter->timer, hz, igb_local_timer, adapter);

}

static void
igb_update_link_status(struct adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	struct ifnet *ifp = adapter->ifp;
	device_t dev = adapter->dev;
	struct tx_ring *txr = adapter->tx_rings;
	u32 link_check = 0;

	/* Get the cached link value or read for real */
        switch (hw->phy.media_type) {
        case e1000_media_type_copper:
                if (hw->mac.get_link_status) {
			/* Do the work to read phy */
                        e1000_check_for_link(hw);
                        link_check = !hw->mac.get_link_status;
                } else
                        link_check = TRUE;
                break;
        case e1000_media_type_fiber:
                e1000_check_for_link(hw);
                link_check = (E1000_READ_REG(hw, E1000_STATUS) &
                                 E1000_STATUS_LU);
                break;
        case e1000_media_type_internal_serdes:
                e1000_check_for_link(hw);
                link_check = adapter->hw.mac.serdes_has_link;
                break;
        default:
        case e1000_media_type_unknown:
                break;
        }

	/* Now we check if a transition has happened */
	if (link_check && (adapter->link_active == 0)) {
		e1000_get_speed_and_duplex(&adapter->hw, 
		    &adapter->link_speed, &adapter->link_duplex);
		if (bootverbose)
			device_printf(dev, "Link is up %d Mbps %s\n",
			    adapter->link_speed,
			    ((adapter->link_duplex == FULL_DUPLEX) ?
			    "Full Duplex" : "Half Duplex"));
		adapter->link_active = 1;
		ifp->if_baudrate = adapter->link_speed * 1000000;
		if_link_state_change(ifp, LINK_STATE_UP);
	} else if (!link_check && (adapter->link_active == 1)) {
		ifp->if_baudrate = adapter->link_speed = 0;
		adapter->link_duplex = 0;
		if (bootverbose)
			device_printf(dev, "Link is Down\n");
		adapter->link_active = 0;
		if_link_state_change(ifp, LINK_STATE_DOWN);
		/* Turn off watchdogs */
		for (int i = 0; i < adapter->num_queues; i++, txr++)
			txr->watchdog_timer = FALSE;
	}
}

/*********************************************************************
 *
 *  This routine disables all traffic on the adapter by issuing a
 *  global reset on the MAC and deallocates TX/RX buffers.
 *
 **********************************************************************/

static void
igb_stop(void *arg)
{
	struct adapter	*adapter = arg;
	struct ifnet	*ifp = adapter->ifp;

	IGB_CORE_LOCK_ASSERT(adapter);

	INIT_DEBUGOUT("igb_stop: begin");

	igb_disable_intr(adapter);

	callout_stop(&adapter->timer);

	/* Tell the stack that the interface is no longer active */
	ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);

	e1000_reset_hw(&adapter->hw);
	E1000_WRITE_REG(&adapter->hw, E1000_WUC, 0);
}


/*********************************************************************
 *
 *  Determine hardware revision.
 *
 **********************************************************************/
static void
igb_identify_hardware(struct adapter *adapter)
{
	device_t dev = adapter->dev;

	/* Make sure our PCI config space has the necessary stuff set */
	adapter->hw.bus.pci_cmd_word = pci_read_config(dev, PCIR_COMMAND, 2);
	if (!((adapter->hw.bus.pci_cmd_word & PCIM_CMD_BUSMASTEREN) &&
	    (adapter->hw.bus.pci_cmd_word & PCIM_CMD_MEMEN))) {
		device_printf(dev, "Memory Access and/or Bus Master bits "
		    "were not set!\n");
		adapter->hw.bus.pci_cmd_word |=
		(PCIM_CMD_BUSMASTEREN | PCIM_CMD_MEMEN);
		pci_write_config(dev, PCIR_COMMAND,
		    adapter->hw.bus.pci_cmd_word, 2);
	}

	/* Save off the information about this board */
	adapter->hw.vendor_id = pci_get_vendor(dev);
	adapter->hw.device_id = pci_get_device(dev);
	adapter->hw.revision_id = pci_read_config(dev, PCIR_REVID, 1);
	adapter->hw.subsystem_vendor_id =
	    pci_read_config(dev, PCIR_SUBVEND_0, 2);
	adapter->hw.subsystem_device_id =
	    pci_read_config(dev, PCIR_SUBDEV_0, 2);

	/* Do Shared Code Init and Setup */
	if (e1000_set_mac_type(&adapter->hw)) {
		device_printf(dev, "Setup init failure\n");
		return;
	}
}

static int
igb_allocate_pci_resources(struct adapter *adapter)
{
	device_t	dev = adapter->dev;
	int		rid;

	rid = PCIR_BAR(0);
	adapter->pci_mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
	    &rid, RF_ACTIVE);
	if (adapter->pci_mem == NULL) {
		device_printf(dev, "Unable to allocate bus resource: memory\n");
		return (ENXIO);
	}
	adapter->osdep.mem_bus_space_tag =
	    rman_get_bustag(adapter->pci_mem);
	adapter->osdep.mem_bus_space_handle =
	    rman_get_bushandle(adapter->pci_mem);
	adapter->hw.hw_addr = (u8 *)&adapter->osdep.mem_bus_space_handle;

	adapter->num_queues = 1; /* Defaults for Legacy or MSI */

	/* This will setup either MSI/X or MSI */
	adapter->msix = igb_setup_msix(adapter);
	adapter->hw.back = &adapter->osdep;

	return (0);
}

/*********************************************************************
 *
 *  Setup the Legacy or MSI Interrupt handler
 *
 **********************************************************************/
static int
igb_allocate_legacy(struct adapter *adapter)
{
	device_t dev = adapter->dev;
	int error, rid = 0;

	/* Turn off all interrupts */
	E1000_WRITE_REG(&adapter->hw, E1000_IMC, 0xffffffff);

	/* MSI RID is 1 */
	if (adapter->msix == 1)
		rid = 1;

	/* We allocate a single interrupt resource */
	adapter->res = bus_alloc_resource_any(dev,
	    SYS_RES_IRQ, &rid, RF_SHAREABLE | RF_ACTIVE);
	if (adapter->res == NULL) {
		device_printf(dev, "Unable to allocate bus resource: "
		    "interrupt\n");
		return (ENXIO);
	}

	/*
	 * Try allocating a fast interrupt and the associated deferred
	 * processing contexts.
	 */
	TASK_INIT(&adapter->rxtx_task, 0, igb_handle_rxtx, adapter);
	adapter->tq = taskqueue_create_fast("igb_taskq", M_NOWAIT,
	    taskqueue_thread_enqueue, &adapter->tq);
	taskqueue_start_threads(&adapter->tq, 1, PI_NET, "%s taskq",
	    device_get_nameunit(adapter->dev));
	if ((error = bus_setup_intr(dev, adapter->res,
	    INTR_TYPE_NET | INTR_MPSAFE, igb_irq_fast, NULL,
	    adapter, &adapter->tag)) != 0) {
		device_printf(dev, "Failed to register fast interrupt "
			    "handler: %d\n", error);
		taskqueue_free(adapter->tq);
		adapter->tq = NULL;
		return (error);
	}

	return (0);
}


/*********************************************************************
 *
 *  Setup the MSIX Interrupt handlers: 
 *
 **********************************************************************/
static int
igb_allocate_msix(struct adapter *adapter)
{
	device_t dev = adapter->dev;
	struct tx_ring *txr = adapter->tx_rings;
	struct rx_ring *rxr = adapter->rx_rings;
	int error, rid, vector = 0;

	/*
	 * Setup the interrupt handlers
	 */

	/* TX Setup */
	for (int i = 0; i < adapter->num_queues; i++, vector++, txr++) {
		rid = vector +1;
		txr->res = bus_alloc_resource_any(dev,
		    SYS_RES_IRQ, &rid, RF_SHAREABLE | RF_ACTIVE);
		if (txr->res == NULL) {
			device_printf(dev,
			    "Unable to allocate bus resource: "
			    "MSIX TX Interrupt\n");
			return (ENXIO);
		}
		error = bus_setup_intr(dev, txr->res,
	    	    INTR_TYPE_NET | INTR_MPSAFE, NULL,
		    igb_msix_tx, txr, &txr->tag);
		if (error) {
			txr->res = NULL;
			device_printf(dev, "Failed to register TX handler");
			return (error);
		}
		/* Make tasklet for deferred handling - one per queue */
		TASK_INIT(&txr->tx_task, 0, igb_handle_tx, txr);
		txr->msix = vector;
		if (adapter->hw.mac.type == e1000_82575)
			txr->eims = E1000_EICR_TX_QUEUE0 << i;
		else
			txr->eims = 1 << vector;
		/*
		** Bind the msix vector, and thus the
		** ring to the corresponding cpu.
		*/
		if (adapter->num_queues > 1)
			bus_bind_intr(dev, txr->res, i);
	}

	/* RX Setup */
	for (int i = 0; i < adapter->num_queues; i++, vector++, rxr++) {
		rid = vector +1;
		rxr->res = bus_alloc_resource_any(dev,
		    SYS_RES_IRQ, &rid, RF_SHAREABLE | RF_ACTIVE);
		if (rxr->res == NULL) {
			device_printf(dev,
			    "Unable to allocate bus resource: "
			    "MSIX RX Interrupt\n");
			return (ENXIO);
		}
		error = bus_setup_intr(dev, rxr->res,
	    	    INTR_TYPE_NET | INTR_MPSAFE, NULL,
		    igb_msix_rx, rxr, &rxr->tag);
		if (error) {
			rxr->res = NULL;
			device_printf(dev, "Failed to register RX handler");
			return (error);
		}
		/* Make tasklet for deferred handling - one per queue */
		TASK_INIT(&rxr->rx_task, 0, igb_handle_rx, rxr);
		rxr->msix = vector;
		if (adapter->hw.mac.type == e1000_82575)
			rxr->eims = E1000_EICR_RX_QUEUE0 << i;
		else
			rxr->eims = 1 << vector;
		/* Get a mask for local timer */
		adapter->rx_mask |= rxr->eims;
		/*
		** Bind the msix vector, and thus the
		** ring to the corresponding cpu.
		** Notice that this makes an RX/TX pair
		** bound to each CPU, limited by the MSIX
		** vectors.
		*/
		if (adapter->num_queues > 1)
			bus_bind_intr(dev, rxr->res, i);
	}

	/* And Link */
	rid = vector +1;
	adapter->res = bus_alloc_resource_any(dev,
	    SYS_RES_IRQ, &rid, RF_SHAREABLE | RF_ACTIVE);
	if (adapter->res == NULL) {
		device_printf(dev,
		    "Unable to allocate bus resource: "
		    "MSIX Link Interrupt\n");
		return (ENXIO);
	}
	if ((error = bus_setup_intr(dev, adapter->res,
	    INTR_TYPE_NET | INTR_MPSAFE, NULL,
	    igb_msix_link, adapter, &adapter->tag)) != 0) {
		device_printf(dev, "Failed to register Link handler");
		return (error);
	}
	adapter->linkvec = vector;
	adapter->tq = taskqueue_create_fast("igb_taskq", M_NOWAIT,
	    taskqueue_thread_enqueue, &adapter->tq);
	taskqueue_start_threads(&adapter->tq, 1, PI_NET, "%s taskq",
	    device_get_nameunit(adapter->dev));

	return (0);
}


static void
igb_configure_queues(struct adapter *adapter)
{
	struct	e1000_hw *hw = &adapter->hw;
	struct	tx_ring	*txr;
	struct	rx_ring	*rxr;

	/* Turn on MSIX */
	/*
	** 82576 uses IVARs to route MSI/X
	** interrupts, its not very intuitive,
	** study the code carefully :)
	*/
	if (adapter->hw.mac.type == e1000_82576) {
		u32	ivar = 0;
		/* First turn on the capability */
		E1000_WRITE_REG(hw, E1000_GPIE,
		    E1000_GPIE_MSIX_MODE |
		    E1000_GPIE_EIAME |
		    E1000_GPIE_PBA | E1000_GPIE_NSICR);
		/* RX */
		for (int i = 0; i < adapter->num_queues; i++) {
			u32 index = i & 0x7; /* Each IVAR has two entries */
			ivar = E1000_READ_REG_ARRAY(hw, E1000_IVAR0, index);
			rxr = &adapter->rx_rings[i];
			if (i < 8) {
				ivar &= 0xFFFFFF00;
				ivar |= rxr->msix | E1000_IVAR_VALID;
			} else {
				ivar &= 0xFF00FFFF;
				ivar |= (rxr->msix | E1000_IVAR_VALID) << 16;
			}
			E1000_WRITE_REG_ARRAY(hw, E1000_IVAR0, index, ivar);
			adapter->eims_mask |= rxr->eims;
		}
		/* TX */
		for (int i = 0; i < adapter->num_queues; i++) {
			u32 index = i & 0x7; /* Each IVAR has two entries */
			ivar = E1000_READ_REG_ARRAY(hw, E1000_IVAR0, index);
			txr = &adapter->tx_rings[i];
			if (i < 8) {
				ivar &= 0xFFFF00FF;
				ivar |= (txr->msix | E1000_IVAR_VALID) << 8;
			} else {
				ivar &= 0x00FFFFFF;
				ivar |= (txr->msix | E1000_IVAR_VALID) << 24;
			}
			E1000_WRITE_REG_ARRAY(hw, E1000_IVAR0, index, ivar);
			adapter->eims_mask |= txr->eims;
		}

		/* And for the link interrupt */
		ivar = (adapter->linkvec | E1000_IVAR_VALID) << 8;
		adapter->link_mask = 1 << adapter->linkvec;
		adapter->eims_mask |= adapter->link_mask;
		E1000_WRITE_REG(hw, E1000_IVAR_MISC, ivar);
	} else
	{ /* 82575 */
		int tmp;

                /* enable MSI-X PBA support*/
		tmp = E1000_READ_REG(hw, E1000_CTRL_EXT);
                tmp |= E1000_CTRL_EXT_PBA_CLR;
                /* Auto-Mask interrupts upon ICR read. */
                tmp |= E1000_CTRL_EXT_EIAME;
                tmp |= E1000_CTRL_EXT_IRCA;
                E1000_WRITE_REG(hw, E1000_CTRL_EXT, tmp);

		/* TX */
		for (int i = 0; i < adapter->num_queues; i++) {
			txr = &adapter->tx_rings[i];
			E1000_WRITE_REG(hw, E1000_MSIXBM(txr->msix),
			    txr->eims);
			adapter->eims_mask |= txr->eims;
		}

		/* RX */
		for (int i = 0; i < adapter->num_queues; i++) {
			rxr = &adapter->rx_rings[i];
			E1000_WRITE_REG(hw, E1000_MSIXBM(rxr->msix),
			    rxr->eims);
			adapter->eims_mask |= rxr->eims;
		}

		/* Link */
		E1000_WRITE_REG(hw, E1000_MSIXBM(adapter->linkvec),
		    E1000_EIMS_OTHER);
		adapter->link_mask |= E1000_EIMS_OTHER;
		adapter->eims_mask |= adapter->link_mask;
	}
	return;
}


static void
igb_free_pci_resources(struct adapter *adapter)
{
	struct          tx_ring *txr = adapter->tx_rings;
	struct          rx_ring *rxr = adapter->rx_rings;
	device_t	dev = adapter->dev;
	int		rid;

	/*
	** There is a slight possibility of a failure mode
	** in attach that will result in entering this function
	** before interrupt resources have been initialized, and
	** in that case we do not want to execute the loops below
	** We can detect this reliably by the state of the adapter
	** res pointer.
	*/
	if (adapter->res == NULL)
		goto mem;

	/*
	 * First release all the TX/RX interrupt resources:
	 */
	for (int i = 0; i < adapter->num_queues; i++, txr++) {
		rid = txr->msix + 1;
		if (txr->tag != NULL) {
			bus_teardown_intr(dev, txr->res, txr->tag);
			txr->tag = NULL;
		}
		if (txr->res != NULL)
			bus_release_resource(dev, SYS_RES_IRQ, rid, txr->res);
	}

	for (int i = 0; i < adapter->num_queues; i++, rxr++) {
		rid = rxr->msix + 1;
		if (rxr->tag != NULL) {
			bus_teardown_intr(dev, rxr->res, rxr->tag);
			rxr->tag = NULL;
		}
		if (rxr->res != NULL)
			bus_release_resource(dev, SYS_RES_IRQ, rid, rxr->res);
	}

	/* Clean the Legacy or Link interrupt last */
	if (adapter->linkvec) /* we are doing MSIX */
		rid = adapter->linkvec + 1;
	else
		(adapter->msix != 0) ? (rid = 1):(rid = 0);

	if (adapter->tag != NULL) {
		bus_teardown_intr(dev, adapter->res, adapter->tag);
		adapter->tag = NULL;
	}
	if (adapter->res != NULL)
		bus_release_resource(dev, SYS_RES_IRQ, rid, adapter->res);

mem:
	if (adapter->msix)
		pci_release_msi(dev);

	if (adapter->msix_mem != NULL)
		bus_release_resource(dev, SYS_RES_MEMORY,
		    PCIR_BAR(IGB_MSIX_BAR), adapter->msix_mem);

	if (adapter->pci_mem != NULL)
		bus_release_resource(dev, SYS_RES_MEMORY,
		    PCIR_BAR(0), adapter->pci_mem);

}

/*
 * Setup Either MSI/X or MSI
 */
static int
igb_setup_msix(struct adapter *adapter)
{
	device_t dev = adapter->dev;
	int rid, want, queues, msgs;

	/* First try MSI/X */
	rid = PCIR_BAR(IGB_MSIX_BAR);
	adapter->msix_mem = bus_alloc_resource_any(dev,
	    SYS_RES_MEMORY, &rid, RF_ACTIVE);
       	if (!adapter->msix_mem) {
		/* May not be enabled */
		device_printf(adapter->dev,
		    "Unable to map MSIX table \n");
		goto msi;
	}

	msgs = pci_msix_count(dev); 
	if (msgs == 0) { /* system has msix disabled */
		bus_release_resource(dev, SYS_RES_MEMORY,
		    PCIR_BAR(IGB_MSIX_BAR), adapter->msix_mem);
		adapter->msix_mem = NULL;
		goto msi;
	}

	/* Figure out a reasonable auto config value */
	queues = (mp_ncpus > ((msgs-1)/2)) ? (msgs-1)/2 : mp_ncpus;

	if (igb_num_queues == 0)
		igb_num_queues = queues;
	/*
	** Two vectors (RX/TX pair) per queue
	** plus an additional for Link interrupt
	*/
	want = (igb_num_queues * 2) + 1;
	if (msgs >= want)
		msgs = want;
	else {
               	device_printf(adapter->dev,
		    "MSIX Configuration Problem, "
		    "%d vectors configured, but %d queues wanted!\n",
		    msgs, want);
		return (ENXIO);
	}
	if ((msgs) && pci_alloc_msix(dev, &msgs) == 0) {
               	device_printf(adapter->dev,
		    "Using MSIX interrupts with %d vectors\n", msgs);
		adapter->num_queues = igb_num_queues;
		return (msgs);
	}
msi:
       	msgs = pci_msi_count(dev);
       	if (msgs == 1 && pci_alloc_msi(dev, &msgs) == 0)
               	device_printf(adapter->dev,"Using MSI interrupt\n");
	return (msgs);
}

/*********************************************************************
 *
 *  Initialize the hardware to a configuration
 *  as specified by the adapter structure.
 *
 **********************************************************************/
static int
igb_hardware_init(struct adapter *adapter)
{
	device_t	dev = adapter->dev;
	u32		rx_buffer_size;

	INIT_DEBUGOUT("igb_hardware_init: begin");

	/* Issue a global reset */
	e1000_reset_hw(&adapter->hw);

	/* Let the firmware know the OS is in control */
	igb_get_hw_control(adapter);

	/*
	 * These parameters control the automatic generation (Tx) and
	 * response (Rx) to Ethernet PAUSE frames.
	 * - High water mark should allow for at least two frames to be
	 *   received after sending an XOFF.
	 * - Low water mark works best when it is very near the high water mark.
	 *   This allows the receiver to restart by sending XON when it has
	 *   drained a bit. Here we use an arbitary value of 1500 which will
	 *   restart after one full frame is pulled from the buffer. There
	 *   could be several smaller frames in the buffer and if so they will
	 *   not trigger the XON until their total number reduces the buffer
	 *   by 1500.
	 * - The pause time is fairly large at 1000 x 512ns = 512 usec.
	 */
	if (adapter->hw.mac.type == e1000_82576)
		rx_buffer_size = ((E1000_READ_REG(&adapter->hw,
		    E1000_RXPBS) & 0xffff) << 10 );
	else
		rx_buffer_size = ((E1000_READ_REG(&adapter->hw,
		    E1000_PBA) & 0xffff) << 10 );

	adapter->hw.fc.high_water = rx_buffer_size -
	    roundup2(adapter->max_frame_size, 1024);
	adapter->hw.fc.low_water = adapter->hw.fc.high_water - 1500;

	adapter->hw.fc.pause_time = IGB_FC_PAUSE_TIME;
	adapter->hw.fc.send_xon = TRUE;

	/* Set Flow control, use the tunable location if sane */
	if ((igb_fc_setting >= 0) || (igb_fc_setting < 4))
		adapter->hw.fc.requested_mode = igb_fc_setting;
	else
		adapter->hw.fc.requested_mode = e1000_fc_none;

	if (e1000_init_hw(&adapter->hw) < 0) {
		device_printf(dev, "Hardware Initialization Failed\n");
		return (EIO);
	}

	e1000_check_for_link(&adapter->hw);

	return (0);
}

/*********************************************************************
 *
 *  Setup networking device structure and register an interface.
 *
 **********************************************************************/
static void
igb_setup_interface(device_t dev, struct adapter *adapter)
{
	struct ifnet   *ifp;

	INIT_DEBUGOUT("igb_setup_interface: begin");

	ifp = adapter->ifp = if_alloc(IFT_ETHER);
	if (ifp == NULL)
		panic("%s: can not if_alloc()", device_get_nameunit(dev));
	if_initname(ifp, device_get_name(dev), device_get_unit(dev));
	ifp->if_mtu = ETHERMTU;
	ifp->if_init =  igb_init;
	ifp->if_softc = adapter;
	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
	ifp->if_ioctl = igb_ioctl;
	ifp->if_start = igb_start;
#if __FreeBSD_version >= 800000
	ifp->if_transmit = igb_mq_start;
	ifp->if_qflush = igb_qflush;
#endif
	IFQ_SET_MAXLEN(&ifp->if_snd, adapter->num_tx_desc - 1);
	ifp->if_snd.ifq_drv_maxlen = adapter->num_tx_desc - 1;
	IFQ_SET_READY(&ifp->if_snd);

	ether_ifattach(ifp, adapter->hw.mac.addr);

	ifp->if_capabilities = ifp->if_capenable = 0;

	ifp->if_capabilities = IFCAP_HWCSUM | IFCAP_VLAN_MTU;
	ifp->if_capabilities |= IFCAP_TSO4;
	ifp->if_capabilities |= IFCAP_JUMBO_MTU;
	ifp->if_capenable = ifp->if_capabilities;

	/*
	 * Tell the upper layer(s) we support long frames.
	 */
	ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header);
	ifp->if_capabilities |= IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU;
	ifp->if_capenable |= IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU;

	/*
	 * Specify the media types supported by this adapter and register
	 * callbacks to update media and link information
	 */
	ifmedia_init(&adapter->media, IFM_IMASK,
	    igb_media_change, igb_media_status);
	if ((adapter->hw.phy.media_type == e1000_media_type_fiber) ||
	    (adapter->hw.phy.media_type == e1000_media_type_internal_serdes)) {
		ifmedia_add(&adapter->media, IFM_ETHER | IFM_1000_SX | IFM_FDX, 
			    0, NULL);
		ifmedia_add(&adapter->media, IFM_ETHER | IFM_1000_SX, 0, NULL);
	} else {
		ifmedia_add(&adapter->media, IFM_ETHER | IFM_10_T, 0, NULL);
		ifmedia_add(&adapter->media, IFM_ETHER | IFM_10_T | IFM_FDX,
			    0, NULL);
		ifmedia_add(&adapter->media, IFM_ETHER | IFM_100_TX,
			    0, NULL);
		ifmedia_add(&adapter->media, IFM_ETHER | IFM_100_TX | IFM_FDX,
			    0, NULL);
		if (adapter->hw.phy.type != e1000_phy_ife) {
			ifmedia_add(&adapter->media,
				IFM_ETHER | IFM_1000_T | IFM_FDX, 0, NULL);
			ifmedia_add(&adapter->media,
				IFM_ETHER | IFM_1000_T, 0, NULL);
		}
	}
	ifmedia_add(&adapter->media, IFM_ETHER | IFM_AUTO, 0, NULL);
	ifmedia_set(&adapter->media, IFM_ETHER | IFM_AUTO);
}


/*
 * Manage DMA'able memory.
 */
static void
igb_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
{
	if (error)
		return;
	*(bus_addr_t *) arg = segs[0].ds_addr;
}

static int
igb_dma_malloc(struct adapter *adapter, bus_size_t size,
        struct igb_dma_alloc *dma, int mapflags)
{
	int error;

	error = bus_dma_tag_create(bus_get_dma_tag(adapter->dev), /* parent */
				IGB_DBA_ALIGN, 0,	/* alignment, bounds */
				BUS_SPACE_MAXADDR,	/* lowaddr */
				BUS_SPACE_MAXADDR,	/* highaddr */
				NULL, NULL,		/* filter, filterarg */
				size,			/* maxsize */
				1,			/* nsegments */
				size,			/* maxsegsize */
				0,			/* flags */
				NULL,			/* lockfunc */
				NULL,			/* lockarg */
				&dma->dma_tag);
	if (error) {
		device_printf(adapter->dev,
		    "%s: bus_dma_tag_create failed: %d\n",
		    __func__, error);
		goto fail_0;
	}

	error = bus_dmamem_alloc(dma->dma_tag, (void**) &dma->dma_vaddr,
	    BUS_DMA_NOWAIT, &dma->dma_map);
	if (error) {
		device_printf(adapter->dev,
		    "%s: bus_dmamem_alloc(%ju) failed: %d\n",
		    __func__, (uintmax_t)size, error);
		goto fail_2;
	}

	dma->dma_paddr = 0;
	error = bus_dmamap_load(dma->dma_tag, dma->dma_map, dma->dma_vaddr,
	    size, igb_dmamap_cb, &dma->dma_paddr, mapflags | BUS_DMA_NOWAIT);
	if (error || dma->dma_paddr == 0) {
		device_printf(adapter->dev,
		    "%s: bus_dmamap_load failed: %d\n",
		    __func__, error);
		goto fail_3;
	}

	return (0);

fail_3:
	bus_dmamap_unload(dma->dma_tag, dma->dma_map);
fail_2:
	bus_dmamem_free(dma->dma_tag, dma->dma_vaddr, dma->dma_map);
	bus_dma_tag_destroy(dma->dma_tag);
fail_0:
	dma->dma_map = NULL;
	dma->dma_tag = NULL;

	return (error);
}

static void
igb_dma_free(struct adapter *adapter, struct igb_dma_alloc *dma)
{
	if (dma->dma_tag == NULL)
		return;
	if (dma->dma_map != NULL) {
		bus_dmamap_sync(dma->dma_tag, dma->dma_map,
		    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
		bus_dmamap_unload(dma->dma_tag, dma->dma_map);
		bus_dmamem_free(dma->dma_tag, dma->dma_vaddr, dma->dma_map);
		dma->dma_map = NULL;
	}
	bus_dma_tag_destroy(dma->dma_tag);
	dma->dma_tag = NULL;
}


/*********************************************************************
 *
 *  Allocate memory for the transmit and receive rings, and then
 *  the descriptors associated with each, called only once at attach.
 *
 **********************************************************************/
static int
igb_allocate_queues(struct adapter *adapter)
{
	device_t dev = adapter->dev;
	struct tx_ring *txr;
	struct rx_ring *rxr;
	int rsize, tsize, error = E1000_SUCCESS;
	int txconf = 0, rxconf = 0;

	/* First allocate the TX ring struct memory */
	if (!(adapter->tx_rings =
	    (struct tx_ring *) malloc(sizeof(struct tx_ring) *
	    adapter->num_queues, M_DEVBUF, M_NOWAIT | M_ZERO))) {
		device_printf(dev, "Unable to allocate TX ring memory\n");
		error = ENOMEM;
		goto fail;
	}
	txr = adapter->tx_rings;

	/* Next allocate the RX */
	if (!(adapter->rx_rings =
	    (struct rx_ring *) malloc(sizeof(struct rx_ring) *
	    adapter->num_queues, M_DEVBUF, M_NOWAIT | M_ZERO))) {
		device_printf(dev, "Unable to allocate RX ring memory\n");
		error = ENOMEM;
		goto rx_fail;
	}
	rxr = adapter->rx_rings;

	tsize = roundup2(adapter->num_tx_desc *
	    sizeof(union e1000_adv_tx_desc), IGB_DBA_ALIGN);
	/*
	 * Now set up the TX queues, txconf is needed to handle the
	 * possibility that things fail midcourse and we need to
	 * undo memory gracefully
	 */ 
	for (int i = 0; i < adapter->num_queues; i++, txconf++) {
		/* Set up some basics */
		txr = &adapter->tx_rings[i];
		txr->adapter = adapter;
		txr->me = i;

		/* Initialize the TX lock */
		snprintf(txr->mtx_name, sizeof(txr->mtx_name), "%s:tx(%d)",
		    device_get_nameunit(dev), txr->me);
		mtx_init(&txr->tx_mtx, txr->mtx_name, NULL, MTX_DEF);

		if (igb_dma_malloc(adapter, tsize,
			&txr->txdma, BUS_DMA_NOWAIT)) {
			device_printf(dev,
			    "Unable to allocate TX Descriptor memory\n");
			error = ENOMEM;
			goto err_tx_desc;
		}
		txr->tx_base = (struct e1000_tx_desc *)txr->txdma.dma_vaddr;
		bzero((void *)txr->tx_base, tsize);

        	/* Now allocate transmit buffers for the ring */
        	if (igb_allocate_transmit_buffers(txr)) {
			device_printf(dev,
			    "Critical Failure setting up transmit buffers\n");
			error = ENOMEM;
			goto err_tx_desc;
        	}
#if __FreeBSD_version >= 800000
		/* Allocate a buf ring */
		txr->br = buf_ring_alloc(IGB_BR_SIZE, M_DEVBUF,
		    M_WAITOK, &txr->tx_mtx);
#endif
	}

	/*
	 * Next the RX queues...
	 */ 
	rsize = roundup2(adapter->num_rx_desc *
	    sizeof(union e1000_adv_rx_desc), IGB_DBA_ALIGN);
	for (int i = 0; i < adapter->num_queues; i++, rxconf++) {
		rxr = &adapter->rx_rings[i];
		rxr->adapter = adapter;
		rxr->me = i;

		/* Initialize the RX lock */
		snprintf(rxr->mtx_name, sizeof(rxr->mtx_name), "%s:rx(%d)",
		    device_get_nameunit(dev), txr->me);
		mtx_init(&rxr->rx_mtx, rxr->mtx_name, NULL, MTX_DEF);

		if (igb_dma_malloc(adapter, rsize,
			&rxr->rxdma, BUS_DMA_NOWAIT)) {
			device_printf(dev,
			    "Unable to allocate RxDescriptor memory\n");
			error = ENOMEM;
			goto err_rx_desc;
		}
		rxr->rx_base = (union e1000_adv_rx_desc *)rxr->rxdma.dma_vaddr;
		bzero((void *)rxr->rx_base, rsize);

        	/* Allocate receive buffers for the ring*/
		if (igb_allocate_receive_buffers(rxr)) {
			device_printf(dev,
			    "Critical Failure setting up receive buffers\n");
			error = ENOMEM;
			goto err_rx_desc;
		}
	}

	return (0);

err_rx_desc:
	for (rxr = adapter->rx_rings; rxconf > 0; rxr++, rxconf--)
		igb_dma_free(adapter, &rxr->rxdma);
err_tx_desc:
	for (txr = adapter->tx_rings; txconf > 0; txr++, txconf--)
		igb_dma_free(adapter, &txr->txdma);
	free(adapter->rx_rings, M_DEVBUF);
rx_fail:
	free(adapter->tx_rings, M_DEVBUF);
fail:
	return (error);
}

/*********************************************************************
 *
 *  Allocate memory for tx_buffer structures. The tx_buffer stores all
 *  the information needed to transmit a packet on the wire. This is
 *  called only once at attach, setup is done every reset.
 *
 **********************************************************************/
static int
igb_allocate_transmit_buffers(struct tx_ring *txr)
{
	struct adapter *adapter = txr->adapter;
	device_t dev = adapter->dev;
	struct igb_tx_buffer *txbuf;
	int error, i;

	/*
	 * Setup DMA descriptor areas.
	 */
	if ((error = bus_dma_tag_create(NULL,		/* parent */
			       PAGE_SIZE, 0,		/* alignment, bounds */
			       BUS_SPACE_MAXADDR,	/* lowaddr */
			       BUS_SPACE_MAXADDR,	/* highaddr */
			       NULL, NULL,		/* filter, filterarg */
			       IGB_TSO_SIZE,		/* maxsize */
			       IGB_MAX_SCATTER,		/* nsegments */
			       PAGE_SIZE,		/* maxsegsize */
			       0,			/* flags */
			       NULL,			/* lockfunc */
			       NULL,			/* lockfuncarg */
			       &txr->txtag))) {
		device_printf(dev,"Unable to allocate TX DMA tag\n");
		goto fail;
	}

	if (!(txr->tx_buffers =
	    (struct igb_tx_buffer *) malloc(sizeof(struct igb_tx_buffer) *
	    adapter->num_tx_desc, M_DEVBUF, M_NOWAIT | M_ZERO))) {
		device_printf(dev, "Unable to allocate tx_buffer memory\n");
		error = ENOMEM;
		goto fail;
	}

        /* Create the descriptor buffer dma maps */
	txbuf = txr->tx_buffers;
	for (i = 0; i < adapter->num_tx_desc; i++, txbuf++) {
		error = bus_dmamap_create(txr->txtag, 0, &txbuf->map);
		if (error != 0) {
			device_printf(dev, "Unable to create TX DMA map\n");
			goto fail;
		}
	}

	return 0;
fail:
	/* We free all, it handles case where we are in the middle */
	igb_free_transmit_structures(adapter);
	return (error);
}

/*********************************************************************
 *
 *  Initialize a transmit ring.
 *
 **********************************************************************/
static void
igb_setup_transmit_ring(struct tx_ring *txr)
{
	struct adapter *adapter = txr->adapter;
	struct igb_tx_buffer *txbuf;
	int i;

	/* Clear the old descriptor contents */
	bzero((void *)txr->tx_base,
	      (sizeof(union e1000_adv_tx_desc)) * adapter->num_tx_desc);
	/* Reset indices */
	txr->next_avail_desc = 0;
	txr->next_to_clean = 0;

	/* Free any existing tx buffers. */
        txbuf = txr->tx_buffers;
	for (i = 0; i < adapter->num_tx_desc; i++, txbuf++) {
		if (txbuf->m_head != NULL) {
			bus_dmamap_sync(txr->txtag, txbuf->map,
			    BUS_DMASYNC_POSTWRITE);
			bus_dmamap_unload(txr->txtag, txbuf->map);
			m_freem(txbuf->m_head);
			txbuf->m_head = NULL;
		}
		/* clear the watch index */
		txbuf->next_eop = -1;
        }

	/* Set number of descriptors available */
	txr->tx_avail = adapter->num_tx_desc;

	bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
	    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);

}

/*********************************************************************
 *
 *  Initialize all transmit rings.
 *
 **********************************************************************/
static void
igb_setup_transmit_structures(struct adapter *adapter)
{
	struct tx_ring *txr = adapter->tx_rings;

	for (int i = 0; i < adapter->num_queues; i++, txr++)
		igb_setup_transmit_ring(txr);

	return;
}

/*********************************************************************
 *
 *  Enable transmit unit.
 *
 **********************************************************************/
static void
igb_initialize_transmit_units(struct adapter *adapter)
{
	struct tx_ring	*txr = adapter->tx_rings;
	u32		tctl, txdctl;

	 INIT_DEBUGOUT("igb_initialize_transmit_units: begin");

	/* Setup the Base and Length of the Tx Descriptor Rings */
	for (int i = 0; i < adapter->num_queues; i++, txr++) {
		u64 bus_addr = txr->txdma.dma_paddr;

		E1000_WRITE_REG(&adapter->hw, E1000_TDLEN(i),
		    adapter->num_tx_desc * sizeof(struct e1000_tx_desc));
		E1000_WRITE_REG(&adapter->hw, E1000_TDBAH(i),
		    (uint32_t)(bus_addr >> 32));
		E1000_WRITE_REG(&adapter->hw, E1000_TDBAL(i),
		    (uint32_t)bus_addr);

		/* Setup the HW Tx Head and Tail descriptor pointers */
		E1000_WRITE_REG(&adapter->hw, E1000_TDT(i), 0);
		E1000_WRITE_REG(&adapter->hw, E1000_TDH(i), 0);

		HW_DEBUGOUT2("Base = %x, Length = %x\n",
		    E1000_READ_REG(&adapter->hw, E1000_TDBAL(i)),
		    E1000_READ_REG(&adapter->hw, E1000_TDLEN(i)));

		/* Setup Transmit Descriptor Base Settings */   
		adapter->txd_cmd = E1000_TXD_CMD_IFCS;

		txdctl = E1000_READ_REG(&adapter->hw, E1000_TXDCTL(i));
		txdctl |= E1000_TXDCTL_QUEUE_ENABLE;
		E1000_WRITE_REG(&adapter->hw, E1000_TXDCTL(i), txdctl);
	}

	/* Program the Transmit Control Register */
	tctl = E1000_READ_REG(&adapter->hw, E1000_TCTL);
	tctl &= ~E1000_TCTL_CT;
	tctl |= (E1000_TCTL_PSP | E1000_TCTL_RTLC | E1000_TCTL_EN |
		   (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT));

	e1000_config_collision_dist(&adapter->hw);

	/* This write will effectively turn on the transmit unit. */
	E1000_WRITE_REG(&adapter->hw, E1000_TCTL, tctl);

}

/*********************************************************************
 *
 *  Free all transmit rings.
 *
 **********************************************************************/
static void
igb_free_transmit_structures(struct adapter *adapter)
{
	struct tx_ring *txr = adapter->tx_rings;

	for (int i = 0; i < adapter->num_queues; i++, txr++) {
		IGB_TX_LOCK(txr);
		igb_free_transmit_buffers(txr);
		igb_dma_free(adapter, &txr->txdma);
		IGB_TX_UNLOCK(txr);
		IGB_TX_LOCK_DESTROY(txr);
	}
	free(adapter->tx_rings, M_DEVBUF);
}

/*********************************************************************
 *
 *  Free transmit ring related data structures.
 *
 **********************************************************************/
static void
igb_free_transmit_buffers(struct tx_ring *txr)
{
	struct adapter *adapter = txr->adapter;
	struct igb_tx_buffer *tx_buffer;
	int             i;

	INIT_DEBUGOUT("free_transmit_ring: begin");

	if (txr->tx_buffers == NULL)
		return;

	tx_buffer = txr->tx_buffers;
	for (i = 0; i < adapter->num_tx_desc; i++, tx_buffer++) {
		if (tx_buffer->m_head != NULL) {
			bus_dmamap_sync(txr->txtag, tx_buffer->map,
			    BUS_DMASYNC_POSTWRITE);
			bus_dmamap_unload(txr->txtag,
			    tx_buffer->map);
			m_freem(tx_buffer->m_head);
			tx_buffer->m_head = NULL;
			if (tx_buffer->map != NULL) {
				bus_dmamap_destroy(txr->txtag,
				    tx_buffer->map);
				tx_buffer->map = NULL;
			}
		} else if (tx_buffer->map != NULL) {
			bus_dmamap_unload(txr->txtag,
			    tx_buffer->map);
			bus_dmamap_destroy(txr->txtag,
			    tx_buffer->map);
			tx_buffer->map = NULL;
		}
	}
#if __FreeBSD_version >= 800000
	buf_ring_free(txr->br, M_DEVBUF);
#endif
	if (txr->tx_buffers != NULL) {
		free(txr->tx_buffers, M_DEVBUF);
		txr->tx_buffers = NULL;
	}
	if (txr->txtag != NULL) {
		bus_dma_tag_destroy(txr->txtag);
		txr->txtag = NULL;
	}
	return;
}

/**********************************************************************
 *
 *  Setup work for hardware segmentation offload (TSO) on
 *  adapters using advanced tx descriptors (82575)
 *
 **********************************************************************/
static boolean_t
igb_tso_setup(struct tx_ring *txr, struct mbuf *mp, u32 *hdrlen)
{
	struct adapter *adapter = txr->adapter;
	struct e1000_adv_tx_context_desc *TXD;
	struct igb_tx_buffer        *tx_buffer;
	u32 vlan_macip_lens = 0, type_tucmd_mlhl = 0;
	u32 mss_l4len_idx = 0;
	u16 vtag = 0;
	int ctxd, ehdrlen, ip_hlen, tcp_hlen;
	struct ether_vlan_header *eh;
	struct ip *ip;
	struct tcphdr *th;


	/*
	 * Determine where frame payload starts.
	 * Jump over vlan headers if already present
	 */
	eh = mtod(mp, struct ether_vlan_header *);
	if (eh->evl_encap_proto == htons(ETHERTYPE_VLAN))
		ehdrlen = ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN;
	else
		ehdrlen = ETHER_HDR_LEN;

	/* Ensure we have at least the IP+TCP header in the first mbuf. */
	if (mp->m_len < ehdrlen + sizeof(struct ip) + sizeof(struct tcphdr))
		return FALSE;

	/* Only supports IPV4 for now */
	ctxd = txr->next_avail_desc;
	tx_buffer = &txr->tx_buffers[ctxd];
	TXD = (struct e1000_adv_tx_context_desc *) &txr->tx_base[ctxd];

	ip = (struct ip *)(mp->m_data + ehdrlen);
	if (ip->ip_p != IPPROTO_TCP)
                return FALSE;   /* 0 */
	ip->ip_sum = 0;
	ip_hlen = ip->ip_hl << 2;
	th = (struct tcphdr *)((caddr_t)ip + ip_hlen);
	th->th_sum = in_pseudo(ip->ip_src.s_addr,
	    ip->ip_dst.s_addr, htons(IPPROTO_TCP));
	tcp_hlen = th->th_off << 2;
	/*
	 * Calculate header length, this is used
	 * in the transmit desc in igb_xmit
	 */
	*hdrlen = ehdrlen + ip_hlen + tcp_hlen;

	/* VLAN MACLEN IPLEN */
	if (mp->m_flags & M_VLANTAG) {
		vtag = htole16(mp->m_pkthdr.ether_vtag);
		vlan_macip_lens |= (vtag << E1000_ADVTXD_VLAN_SHIFT);
	}

	vlan_macip_lens |= (ehdrlen << E1000_ADVTXD_MACLEN_SHIFT);
	vlan_macip_lens |= ip_hlen;
	TXD->vlan_macip_lens |= htole32(vlan_macip_lens);

	/* ADV DTYPE TUCMD */
	type_tucmd_mlhl |= E1000_ADVTXD_DCMD_DEXT | E1000_ADVTXD_DTYP_CTXT;
	type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_L4T_TCP;
	type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_IPV4;
	TXD->type_tucmd_mlhl |= htole32(type_tucmd_mlhl);

	/* MSS L4LEN IDX */
	mss_l4len_idx |= (mp->m_pkthdr.tso_segsz << E1000_ADVTXD_MSS_SHIFT);
	mss_l4len_idx |= (tcp_hlen << E1000_ADVTXD_L4LEN_SHIFT);
	TXD->mss_l4len_idx = htole32(mss_l4len_idx);

	TXD->seqnum_seed = htole32(0);
	tx_buffer->m_head = NULL;
	tx_buffer->next_eop = -1;

	if (++ctxd == adapter->num_tx_desc)
		ctxd = 0;

	txr->tx_avail--;
	txr->next_avail_desc = ctxd;
	return TRUE;
}


/*********************************************************************
 *
 *  Context Descriptor setup for VLAN or CSUM
 *
 **********************************************************************/

static bool
igb_tx_ctx_setup(struct tx_ring *txr, struct mbuf *mp)
{
	struct adapter *adapter = txr->adapter;
	struct e1000_adv_tx_context_desc *TXD;
	struct igb_tx_buffer        *tx_buffer;
	uint32_t vlan_macip_lens = 0, type_tucmd_mlhl = 0;
	struct ether_vlan_header *eh;
	struct ip *ip = NULL;
	struct ip6_hdr *ip6;
	int  ehdrlen, ctxd, ip_hlen = 0;
	u16	etype, vtag = 0;
	u8	ipproto = 0;
	bool	offload = TRUE;

	if ((mp->m_pkthdr.csum_flags & CSUM_OFFLOAD) == 0)
		offload = FALSE;

	ctxd = txr->next_avail_desc;
	tx_buffer = &txr->tx_buffers[ctxd];
	TXD = (struct e1000_adv_tx_context_desc *) &txr->tx_base[ctxd];

	/*
	** In advanced descriptors the vlan tag must 
	** be placed into the context descriptor, thus
	** we need to be here just for that setup.
	*/
	if (mp->m_flags & M_VLANTAG) {
		vtag = htole16(mp->m_pkthdr.ether_vtag);
		vlan_macip_lens |= (vtag << E1000_ADVTXD_VLAN_SHIFT);
	} else if (offload == FALSE)
		return FALSE;

	/*
	 * Determine where frame payload starts.
	 * Jump over vlan headers if already present,
	 * helpful for QinQ too.
	 */
	eh = mtod(mp, struct ether_vlan_header *);
	if (eh->evl_encap_proto == htons(ETHERTYPE_VLAN)) {
		etype = ntohs(eh->evl_proto);
		ehdrlen = ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN;
	} else {
		etype = ntohs(eh->evl_encap_proto);
		ehdrlen = ETHER_HDR_LEN;
	}

	/* Set the ether header length */
	vlan_macip_lens |= ehdrlen << E1000_ADVTXD_MACLEN_SHIFT;

	switch (etype) {
		case ETHERTYPE_IP:
			ip = (struct ip *)(mp->m_data + ehdrlen);
			ip_hlen = ip->ip_hl << 2;
			if (mp->m_len < ehdrlen + ip_hlen) {
				offload = FALSE;
				break;
			}
			ipproto = ip->ip_p;
			type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_IPV4;
			break;
		case ETHERTYPE_IPV6:
			ip6 = (struct ip6_hdr *)(mp->m_data + ehdrlen);
			ip_hlen = sizeof(struct ip6_hdr);
			if (mp->m_len < ehdrlen + ip_hlen)
				return (FALSE);
			ipproto = ip6->ip6_nxt;
			type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_IPV6;
			break;
		default:
			offload = FALSE;
			break;
	}

	vlan_macip_lens |= ip_hlen;
	type_tucmd_mlhl |= E1000_ADVTXD_DCMD_DEXT | E1000_ADVTXD_DTYP_CTXT;

	switch (ipproto) {
		case IPPROTO_TCP:
			if (mp->m_pkthdr.csum_flags & CSUM_TCP)
				type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_L4T_TCP;
			break;
		case IPPROTO_UDP:
			if (mp->m_pkthdr.csum_flags & CSUM_UDP)
				type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_L4T_UDP;
			break;
#if __FreeBSD_version >= 800000
		case IPPROTO_SCTP:
			if (mp->m_pkthdr.csum_flags & CSUM_SCTP)
				type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_L4T_SCTP;
			break;
#endif
		default:
			offload = FALSE;
			break;
	}

	/* Now copy bits into descriptor */
	TXD->vlan_macip_lens |= htole32(vlan_macip_lens);
	TXD->type_tucmd_mlhl |= htole32(type_tucmd_mlhl);
	TXD->seqnum_seed = htole32(0);
	TXD->mss_l4len_idx = htole32(0);

	tx_buffer->m_head = NULL;
	tx_buffer->next_eop = -1;

	/* We've consumed the first desc, adjust counters */
	if (++ctxd == adapter->num_tx_desc)
		ctxd = 0;
	txr->next_avail_desc = ctxd;
	--txr->tx_avail;

        return (offload);
}


/**********************************************************************
 *
 *  Examine each tx_buffer in the used queue. If the hardware is done
 *  processing the packet then free associated resources. The
 *  tx_buffer is put back on the free queue.
 *
 *  TRUE return means there's work in the ring to clean, FALSE its empty.
 **********************************************************************/
static bool
igb_txeof(struct tx_ring *txr)
{
	struct adapter	*adapter = txr->adapter;
        int first, last, done, num_avail;
	u32	cleaned = 0;
        struct igb_tx_buffer *tx_buffer;
        struct e1000_tx_desc   *tx_desc, *eop_desc;
	struct ifnet   *ifp = adapter->ifp;

	IGB_TX_LOCK_ASSERT(txr);

        if (txr->tx_avail == adapter->num_tx_desc)
                return FALSE;

        num_avail = txr->tx_avail;
        first = txr->next_to_clean;
        tx_desc = &txr->tx_base[first];
        tx_buffer = &txr->tx_buffers[first];
	last = tx_buffer->next_eop;
        eop_desc = &txr->tx_base[last];

	/*
	 * What this does is get the index of the
	 * first descriptor AFTER the EOP of the 
	 * first packet, that way we can do the
	 * simple comparison on the inner while loop.
	 */
	if (++last == adapter->num_tx_desc)
 		last = 0;
	done = last;

        bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
            BUS_DMASYNC_POSTREAD);

        while (eop_desc->upper.fields.status & E1000_TXD_STAT_DD) {
		/* We clean the range of the packet */
		while (first != done) {
                	tx_desc->upper.data = 0;
                	tx_desc->lower.data = 0;
                	tx_desc->buffer_addr = 0;
                	++num_avail; ++cleaned;

			if (tx_buffer->m_head) {
				ifp->if_opackets++;
				bus_dmamap_sync(txr->txtag,
				    tx_buffer->map,
				    BUS_DMASYNC_POSTWRITE);
				bus_dmamap_unload(txr->txtag,
				    tx_buffer->map);

                        	m_freem(tx_buffer->m_head);
                        	tx_buffer->m_head = NULL;
                	}
			tx_buffer->next_eop = -1;

	                if (++first == adapter->num_tx_desc)
				first = 0;

	                tx_buffer = &txr->tx_buffers[first];
			tx_desc = &txr->tx_base[first];
		}
		/* See if we can continue to the next packet */
		last = tx_buffer->next_eop;
		if (last != -1) {
        		eop_desc = &txr->tx_base[last];
			/* Get new done point */
			if (++last == adapter->num_tx_desc) last = 0;
			done = last;
		} else
			break;
        }
        bus_dmamap_sync(txr->txdma.dma_tag, txr->txdma.dma_map,
            BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);

        txr->next_to_clean = first;

        /*
         * If we have enough room, clear IFF_DRV_OACTIVE to tell the stack
         * that it is OK to send packets.
         * If there are no pending descriptors, clear the timeout. Otherwise,
         * if some descriptors have been freed, restart the timeout.
         */
        if (num_avail > IGB_TX_CLEANUP_THRESHOLD) {                
                ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
		/* All clean, turn off the timer */
                if (num_avail == adapter->num_tx_desc) {
			txr->watchdog_timer = 0;
        		txr->tx_avail = num_avail;
			return FALSE;
		}
        }

	/* Some cleaned, reset the timer */
	if (cleaned)
		txr->watchdog_timer = IGB_TX_TIMEOUT;
        txr->tx_avail = num_avail;
        return TRUE;
}


/*********************************************************************
 *
 *  Setup descriptor buffer(s) from system mbuf buffer pools.
 *  		i - designates the ring index
 *		clean - tells the function whether to update
 *		        the header, the packet buffer, or both.
 *
 **********************************************************************/
static int
igb_get_buf(struct rx_ring *rxr, int i, u8 clean)
{
	struct adapter		*adapter = rxr->adapter;
	struct mbuf		*mh, *mp;
	bus_dma_segment_t	seg[2];
	bus_dmamap_t		map;
	struct igb_rx_buffer	*rx_buffer;
	int			error, nsegs;
	int			merr = 0;


	rx_buffer = &rxr->rx_buffers[i];

	/* First get our header and payload mbuf */
	if (clean & IGB_CLEAN_HEADER) {
		mh = m_gethdr(M_DONTWAIT, MT_DATA);
		if (mh == NULL)
			goto remap;
	} else  /* reuse */
		mh = rxr->rx_buffers[i].m_head;

	mh->m_len = MHLEN;
	mh->m_flags |= M_PKTHDR;

	if (clean & IGB_CLEAN_PAYLOAD) {
		mp = m_getjcl(M_DONTWAIT, MT_DATA,
		    M_PKTHDR, adapter->rx_mbuf_sz);
		if (mp == NULL)
			goto remap;
		mp->m_len = adapter->rx_mbuf_sz;
		mp->m_flags &= ~M_PKTHDR;
	} else {	/* reusing */
		mp = rxr->rx_buffers[i].m_pack;
		mp->m_len = adapter->rx_mbuf_sz;
		mp->m_flags &= ~M_PKTHDR;
	}
	/*
	** Need to create a chain for the following
	** dmamap call at this point.
	*/
	mh->m_next = mp;
	mh->m_pkthdr.len = mh->m_len + mp->m_len;

	/* Get the memory mapping */
	error = bus_dmamap_load_mbuf_sg(rxr->rxtag,
	    rxr->rx_spare_map, mh, seg, &nsegs, BUS_DMA_NOWAIT);
	if (error != 0) {
		printf("GET BUF: dmamap load failure - %d\n", error);
		m_free(mh);
		return (error);
	}

	/* Unload old mapping and update buffer struct */
	if (rx_buffer->m_head != NULL)
			bus_dmamap_unload(rxr->rxtag, rx_buffer->map);
	map = rx_buffer->map;
	rx_buffer->map = rxr->rx_spare_map;
	rxr->rx_spare_map = map;
	rx_buffer->m_head = mh;
	rx_buffer->m_pack = mp;
	bus_dmamap_sync(rxr->rxtag,
	    rx_buffer->map, BUS_DMASYNC_PREREAD);

	/* Update descriptor */
	rxr->rx_base[i].read.hdr_addr = htole64(seg[0].ds_addr);
	rxr->rx_base[i].read.pkt_addr = htole64(seg[1].ds_addr);

	return (0);

	/*
	** If we get here, we have an mbuf resource
	** issue, so we discard the incoming packet
	** and attempt to reuse existing mbufs next
	** pass thru the ring, but to do so we must
	** fix up the descriptor which had the address
	** clobbered with writeback info.
	*/
remap:
	adapter->mbuf_header_failed++;
	merr = ENOBUFS;
	/* Is there a reusable buffer? */
	mh = rxr->rx_buffers[i].m_head;
	if (mh == NULL) /* Nope, init error */
		return (merr);
	mp = rxr->rx_buffers[i].m_pack;
	if (mp == NULL) /* Nope, init error */
		return (merr);
	/* Get our old mapping */
	rx_buffer = &rxr->rx_buffers[i];
	error = bus_dmamap_load_mbuf_sg(rxr->rxtag,
	    rx_buffer->map, mh, seg, &nsegs, BUS_DMA_NOWAIT);
	if (error != 0) {
		/* We really have a problem */
		m_free(mh);
		return (error);
	}
	/* Now fix the descriptor as needed */
	rxr->rx_base[i].read.hdr_addr = htole64(seg[0].ds_addr);
	rxr->rx_base[i].read.pkt_addr = htole64(seg[1].ds_addr);
	return (merr);
}


/*********************************************************************
 *
 *  Allocate memory for rx_buffer structures. Since we use one
 *  rx_buffer per received packet, the maximum number of rx_buffer's
 *  that we'll need is equal to the number of receive descriptors
 *  that we've allocated.
 *
 **********************************************************************/
static int
igb_allocate_receive_buffers(struct rx_ring *rxr)
{
	struct	adapter 	*adapter = rxr->adapter;
	device_t 		dev = adapter->dev;
	struct igb_rx_buffer 	*rxbuf;
	int             	i, bsize, error;

	bsize = sizeof(struct igb_rx_buffer) * adapter->num_rx_desc;
	if (!(rxr->rx_buffers =
	    (struct igb_rx_buffer *) malloc(bsize,
	    M_DEVBUF, M_NOWAIT | M_ZERO))) {
		device_printf(dev, "Unable to allocate rx_buffer memory\n");
		error = ENOMEM;
		goto fail;
	}

	/*
	** The tag is made to accomodate the largest buffer size
	** with packet split (hence the two segments, even though
	** it may not always use this.
	*/
	if ((error = bus_dma_tag_create(NULL,		/* parent */
				   PAGE_SIZE, 0,	/* alignment, bounds */
				   BUS_SPACE_MAXADDR,	/* lowaddr */
				   BUS_SPACE_MAXADDR,	/* highaddr */
				   NULL, NULL,		/* filter, filterarg */
				   MJUM16BYTES,		/* maxsize */
				   2,			/* nsegments */
				   MJUMPAGESIZE,	/* maxsegsize */
				   0,			/* flags */
				   NULL,		/* lockfunc */
				   NULL,		/* lockfuncarg */
				   &rxr->rxtag))) {
		device_printf(dev, "Unable to create RX DMA tag\n");
		goto fail;
	}

	/* Create the spare map (used by getbuf) */
        error = bus_dmamap_create(rxr->rxtag, BUS_DMA_NOWAIT,
	     &rxr->rx_spare_map);
	if (error) {
		device_printf(dev,
		    "%s: bus_dmamap_create header spare failed: %d\n",
		    __func__, error);
		goto fail;
	}

	for (i = 0; i < adapter->num_rx_desc; i++, rxbuf++) {
		rxbuf = &rxr->rx_buffers[i];
		error = bus_dmamap_create(rxr->rxtag,
		    BUS_DMA_NOWAIT, &rxbuf->map);
		if (error) {
			device_printf(dev, "Unable to create RX DMA maps\n");
			goto fail;
		}
	}

	return (0);

fail:
	/* Frees all, but can handle partial completion */
	igb_free_receive_structures(adapter);
	return (error);
}

/*********************************************************************
 *
 *  Initialize a receive ring and its buffers.
 *
 **********************************************************************/
static int
igb_setup_receive_ring(struct rx_ring *rxr)
{
	struct	adapter		*adapter;
	struct  ifnet		*ifp;
	device_t		dev;
	struct igb_rx_buffer	*rxbuf;
	struct lro_ctrl		*lro = &rxr->lro;
	int			j, rsize;

	adapter = rxr->adapter;
	dev = adapter->dev;
	ifp = adapter->ifp;
	rxr->lro_enabled = FALSE;
	rxr->hdr_split = FALSE;

	/* Clear the ring contents */
	rsize = roundup2(adapter->num_rx_desc *
	    sizeof(union e1000_adv_rx_desc), IGB_DBA_ALIGN);
	bzero((void *)rxr->rx_base, rsize);

	/*
	** Free current RX buffer structures and their mbufs
	*/
	for (int i = 0; i < adapter->num_rx_desc; i++) {
		rxbuf = &rxr->rx_buffers[i];
		bus_dmamap_sync(rxr->rxtag, rxbuf->map,
		    BUS_DMASYNC_POSTREAD);
		bus_dmamap_unload(rxr->rxtag, rxbuf->map);
		if (rxbuf->m_head) {
			rxbuf->m_head->m_next = rxbuf->m_pack;
			m_freem(rxbuf->m_head);
		}
		rxbuf->m_head = NULL;
		rxbuf->m_pack = NULL;
	}

	/* Next replenish the ring */
	for (j = 0; j < adapter->num_rx_desc; j++) {
		if (igb_get_buf(rxr, j, IGB_CLEAN_BOTH) == ENOBUFS) {
			rxr->rx_buffers[j].m_head = NULL;
			rxr->rx_buffers[j].m_pack = NULL;
			rxr->rx_base[j].read.hdr_addr = 0;
			rxr->rx_base[j].read.pkt_addr = 0;
			goto fail;
		}
	}

	/* Setup our descriptor indices */
	rxr->next_to_check = 0;
	rxr->last_cleaned = 0;

	bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
	    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);

	/*
	** Now set up the LRO interface, we
	** also only do head split when LRO
	** is enabled, since so often they
	** are undesireable in similar setups.
	*/
	if (ifp->if_capenable & IFCAP_LRO) {
		int err = tcp_lro_init(lro);
		if (err) {
			device_printf(dev,"LRO Initialization failed!\n");
			goto fail;
		}
		INIT_DEBUGOUT("RX LRO Initialized\n");
		rxr->lro_enabled = TRUE;
		rxr->hdr_split = TRUE;
		lro->ifp = adapter->ifp;
	}

	return (0);
fail:
	/*
	 * We need to clean up any buffers allocated
	 * so far, 'j' is the failing index.
	 */
	for (int i = 0; i < j; i++) {
		rxbuf = &rxr->rx_buffers[i];
		if (rxbuf->m_head != NULL) {
			bus_dmamap_sync(rxr->rxtag, rxbuf->map,
			    BUS_DMASYNC_POSTREAD);
			bus_dmamap_unload(rxr->rxtag, rxbuf->map);
			m_freem(rxbuf->m_head);
			rxbuf->m_head = NULL;
		}
	}
	return (ENOBUFS);
}

/*********************************************************************
 *
 *  Initialize all receive rings.
 *
 **********************************************************************/
static int
igb_setup_receive_structures(struct adapter *adapter)
{
	struct rx_ring *rxr = adapter->rx_rings;
	int i, j;

	for (i = 0; i < adapter->num_queues; i++, rxr++)
		if (igb_setup_receive_ring(rxr))
			goto fail;

	return (0);
fail:
	/*
	 * Free RX buffers allocated so far, we will only handle
	 * the rings that completed, the failing case will have
	 * cleaned up for itself. The value of 'i' will be the
	 * failed ring so we must pre-decrement it.
	 */
	rxr = adapter->rx_rings;
	for (--i; i > 0; i--, rxr++) {
		for (j = 0; j < adapter->num_rx_desc; j++) {
			struct igb_rx_buffer *rxbuf;
			rxbuf = &rxr->rx_buffers[j];
			if (rxbuf->m_head != NULL) {
				bus_dmamap_sync(rxr->rxtag, rxbuf->map,
			  	  BUS_DMASYNC_POSTREAD);
				bus_dmamap_unload(rxr->rxtag, rxbuf->map);
				m_freem(rxbuf->m_head);
				rxbuf->m_head = NULL;
			}
		}
	}

	return (ENOBUFS);
}

/*********************************************************************
 *
 *  Enable receive unit.
 *
 **********************************************************************/
static void
igb_initialize_receive_units(struct adapter *adapter)
{
	struct rx_ring	*rxr = adapter->rx_rings;
	struct ifnet	*ifp = adapter->ifp;
	u32		rctl, rxcsum, psize, srrctl = 0;

	INIT_DEBUGOUT("igb_initialize_receive_unit: begin");

	/*
	 * Make sure receives are disabled while setting
	 * up the descriptor ring
	 */
	rctl = E1000_READ_REG(&adapter->hw, E1000_RCTL);
	E1000_WRITE_REG(&adapter->hw, E1000_RCTL, rctl & ~E1000_RCTL_EN);

	/*
	** Set up for header split
	*/
	if (rxr->hdr_split) {
		/* Use a standard mbuf for the header */
		srrctl |= IGB_HDR_BUF << E1000_SRRCTL_BSIZEHDRSIZE_SHIFT;
		srrctl |= E1000_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
	} else
		srrctl |= E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;

	/*
	** Set up for jumbo frames
	*/
	if (ifp->if_mtu > ETHERMTU) {
		rctl |= E1000_RCTL_LPE;
		srrctl |= 4096 >> E1000_SRRCTL_BSIZEPKT_SHIFT;
		rctl |= E1000_RCTL_SZ_4096 | E1000_RCTL_BSEX;

		/* Set maximum packet len */
		psize = adapter->max_frame_size;
		/* are we on a vlan? */
		if (adapter->ifp->if_vlantrunk != NULL)
			psize += VLAN_TAG_SIZE;
		E1000_WRITE_REG(&adapter->hw, E1000_RLPML, psize);
	} else {
		rctl &= ~E1000_RCTL_LPE;
		srrctl |= 2048 >> E1000_SRRCTL_BSIZEPKT_SHIFT;
		rctl |= E1000_RCTL_SZ_2048;
	}

	/* Setup the Base and Length of the Rx Descriptor Rings */
	for (int i = 0; i < adapter->num_queues; i++, rxr++) {
		u64 bus_addr = rxr->rxdma.dma_paddr;
		u32 rxdctl;

		E1000_WRITE_REG(&adapter->hw, E1000_RDLEN(i),
		    adapter->num_rx_desc * sizeof(struct e1000_rx_desc));
		E1000_WRITE_REG(&adapter->hw, E1000_RDBAH(i),
		    (uint32_t)(bus_addr >> 32));
		E1000_WRITE_REG(&adapter->hw, E1000_RDBAL(i),
		    (uint32_t)bus_addr);
		E1000_WRITE_REG(&adapter->hw, E1000_SRRCTL(i), srrctl);
		/* Enable this Queue */
		rxdctl = E1000_READ_REG(&adapter->hw, E1000_RXDCTL(i));
		rxdctl |= E1000_RXDCTL_QUEUE_ENABLE;
		rxdctl &= 0xFFF00000;
		rxdctl |= IGB_RX_PTHRESH;
		rxdctl |= IGB_RX_HTHRESH << 8;
		rxdctl |= IGB_RX_WTHRESH << 16;
		E1000_WRITE_REG(&adapter->hw, E1000_RXDCTL(i), rxdctl);
	}

	/*
	** Setup for RX MultiQueue
	*/
	rxcsum = E1000_READ_REG(&adapter->hw, E1000_RXCSUM);
	if (adapter->num_queues >1) {
		u32 random[10], mrqc, shift = 0;
		union igb_reta {
			u32 dword;
			u8  bytes[4];
		} reta;

		arc4rand(&random, sizeof(random), 0);
		if (adapter->hw.mac.type == e1000_82575)
			shift = 6;
		/* Warning FM follows */
		for (int i = 0; i < 128; i++) {
			reta.bytes[i & 3] =
			    (i % adapter->num_queues) << shift;
			if ((i & 3) == 3)
				E1000_WRITE_REG(&adapter->hw,
				    E1000_RETA(i >> 2), reta.dword);
		}
		/* Now fill in hash table */
		mrqc = E1000_MRQC_ENABLE_RSS_4Q;
		for (int i = 0; i < 10; i++)
			E1000_WRITE_REG_ARRAY(&adapter->hw,
			    E1000_RSSRK(0), i, random[i]);

		mrqc |= (E1000_MRQC_RSS_FIELD_IPV4 |
		    E1000_MRQC_RSS_FIELD_IPV4_TCP);
		mrqc |= (E1000_MRQC_RSS_FIELD_IPV6 |
		    E1000_MRQC_RSS_FIELD_IPV6_TCP);
		mrqc |=( E1000_MRQC_RSS_FIELD_IPV4_UDP |
		    E1000_MRQC_RSS_FIELD_IPV6_UDP);
		mrqc |=( E1000_MRQC_RSS_FIELD_IPV6_UDP_EX |
		    E1000_MRQC_RSS_FIELD_IPV6_TCP_EX);

		E1000_WRITE_REG(&adapter->hw, E1000_MRQC, mrqc);

		/*
		** NOTE: Receive Full-Packet Checksum Offload 
		** is mutually exclusive with Multiqueue. However
		** this is not the same as TCP/IP checksums which
		** still work.
		*/
		rxcsum |= E1000_RXCSUM_PCSD;
#if __FreeBSD_version >= 800000
		/* For SCTP Offload */
		if ((adapter->hw.mac.type == e1000_82576)
		    && (ifp->if_capenable & IFCAP_RXCSUM))
			rxcsum |= E1000_RXCSUM_CRCOFL;
#endif
	} else {
		/* Non RSS setup */
		if (ifp->if_capenable & IFCAP_RXCSUM) {
			rxcsum |= E1000_RXCSUM_IPPCSE;
#if __FreeBSD_version >= 800000
			if (adapter->hw.mac.type == e1000_82576)
				rxcsum |= E1000_RXCSUM_CRCOFL;
#endif
		} else
			rxcsum &= ~E1000_RXCSUM_TUOFL;
	}
	E1000_WRITE_REG(&adapter->hw, E1000_RXCSUM, rxcsum);

	/* Setup the Receive Control Register */
	rctl &= ~(3 << E1000_RCTL_MO_SHIFT);
	rctl |= E1000_RCTL_EN | E1000_RCTL_BAM | E1000_RCTL_LBM_NO |
		   E1000_RCTL_RDMTS_HALF |
		   (adapter->hw.mac.mc_filter_type << E1000_RCTL_MO_SHIFT);

	/* Make sure VLAN Filters are off */
	rctl &= ~E1000_RCTL_VFE;
	/* Don't store bad packets */
	rctl &= ~E1000_RCTL_SBP;

	/* Enable Receives */
	E1000_WRITE_REG(&adapter->hw, E1000_RCTL, rctl);

	/*
	 * Setup the HW Rx Head and Tail Descriptor Pointers
	 *   - needs to be after enable
	 */
	for (int i = 0; i < adapter->num_queues; i++) {
		E1000_WRITE_REG(&adapter->hw, E1000_RDH(i), 0);
		E1000_WRITE_REG(&adapter->hw, E1000_RDT(i),
		     adapter->num_rx_desc - 1);
	}
	return;
}

/*********************************************************************
 *
 *  Free receive rings.
 *
 **********************************************************************/
static void
igb_free_receive_structures(struct adapter *adapter)
{
	struct rx_ring *rxr = adapter->rx_rings;

	for (int i = 0; i < adapter->num_queues; i++, rxr++) {
		struct lro_ctrl	*lro = &rxr->lro;
		igb_free_receive_buffers(rxr);
		tcp_lro_free(lro);
		igb_dma_free(adapter, &rxr->rxdma);
	}

	free(adapter->rx_rings, M_DEVBUF);
}

/*********************************************************************
 *
 *  Free receive ring data structures.
 *
 **********************************************************************/
static void
igb_free_receive_buffers(struct rx_ring *rxr)
{
	struct adapter	*adapter = rxr->adapter;
	struct igb_rx_buffer *rx_buffer;

	INIT_DEBUGOUT("free_receive_structures: begin");

	if (rxr->rx_spare_map) {
		bus_dmamap_destroy(rxr->rxtag, rxr->rx_spare_map);
		rxr->rx_spare_map = NULL;
	}

	/* Cleanup any existing buffers */
	if (rxr->rx_buffers != NULL) {
		rx_buffer = &rxr->rx_buffers[0];
		for (int i = 0; i < adapter->num_rx_desc; i++, rx_buffer++) {
			if (rx_buffer->m_head != NULL) {
				bus_dmamap_sync(rxr->rxtag, rx_buffer->map,
				    BUS_DMASYNC_POSTREAD);
				bus_dmamap_unload(rxr->rxtag,
				    rx_buffer->map);
				m_freem(rx_buffer->m_head);
				rx_buffer->m_head = NULL;
			} else if (rx_buffer->map != NULL)
				bus_dmamap_unload(rxr->rxtag,
				    rx_buffer->map);
			if (rx_buffer->map != NULL) {
				bus_dmamap_destroy(rxr->rxtag,
				    rx_buffer->map);
				rx_buffer->map = NULL;
			}
		}
	}

	if (rxr->rx_buffers != NULL) {
		free(rxr->rx_buffers, M_DEVBUF);
		rxr->rx_buffers = NULL;
	}

	if (rxr->rxtag != NULL) {
		bus_dma_tag_destroy(rxr->rxtag);
		rxr->rxtag = NULL;
	}
}
/*********************************************************************
 *
 *  This routine executes in interrupt context. It replenishes
 *  the mbufs in the descriptor and sends data which has been
 *  dma'ed into host memory to upper layer.
 *
 *  We loop at most count times if count is > 0, or until done if
 *  count < 0.
 *
 *  Return TRUE if more to clean, FALSE otherwise
 *********************************************************************/
static bool
igb_rxeof(struct rx_ring *rxr, int count)
{
	struct adapter		*adapter = rxr->adapter;
	struct ifnet		*ifp;
	struct lro_ctrl		*lro = &rxr->lro;
	struct lro_entry	*queued;
	int			i;
	u32			staterr;
	union e1000_adv_rx_desc	*cur;


	IGB_RX_LOCK(rxr);
	ifp = adapter->ifp;
	i = rxr->next_to_check;
	cur = &rxr->rx_base[i];
	staterr = cur->wb.upper.status_error;

	if (!(staterr & E1000_RXD_STAT_DD)) {
		IGB_RX_UNLOCK(rxr);
		return FALSE;
	}

	/* Sync the ring */
	bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
	    BUS_DMASYNC_POSTREAD);

	/* Main clean loop */
	while ((staterr & E1000_RXD_STAT_DD) &&
	    (count != 0) &&
	    (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
		struct mbuf *sendmp, *mh, *mp;
		u16 hlen, plen, hdr, ptype, len_adj, vtag;
		u8 dopayload, accept_frame, eop;
 
		accept_frame = 1;
		hlen = plen = len_adj = vtag = 0;
		sendmp = mh = mp = NULL;
		ptype = (u16)(cur->wb.lower.lo_dword.data >> 4);

		/* Sync the buffers */
		bus_dmamap_sync(rxr->rxtag, rxr->rx_buffers[i].map,
			    BUS_DMASYNC_POSTREAD);

		/*
		** The way the hardware is configured to
		** split, it will ONLY use the header buffer
		** when header split is enabled, otherwise we
		** get normal behavior, ie, both header and
		** payload are DMA'd into the payload buffer.
		**
		** The fmp test is to catch the case where a
		** packet spans multiple descriptors, in that
		** case only the first header is valid.
		*/
		if ((rxr->hdr_split) && (rxr->fmp == NULL)){
			hdr = le16toh(cur->
			    wb.lower.lo_dword.hs_rss.hdr_info);
			hlen = (hdr & E1000_RXDADV_HDRBUFLEN_MASK) >>
			    E1000_RXDADV_HDRBUFLEN_SHIFT;
			if (hlen > IGB_HDR_BUF)
				hlen = IGB_HDR_BUF;
			plen = le16toh(cur->wb.upper.length);
			/* Handle the header mbuf */
			mh = rxr->rx_buffers[i].m_head;
			mh->m_len = hlen;
			dopayload = IGB_CLEAN_HEADER;
			/*
			** Get the payload length, this
			** could be zero if its a small
			** packet.
			*/
			if (plen) {
				mp = rxr->rx_buffers[i].m_pack;
				mp->m_len = plen;
				mp->m_next = NULL;
				mp->m_flags &= ~M_PKTHDR;
				mh->m_next = mp;
				mh->m_flags |= M_PKTHDR;
				dopayload = IGB_CLEAN_BOTH;
				rxr->rx_split_packets++;
			} else {  /* small packets */
				mh->m_flags &= ~M_PKTHDR;
				mh->m_next = NULL;
			}
		} else {
			/*
			** Either no header split, or a
			** secondary piece of a fragmented
			** split packet.
			*/
			mh = rxr->rx_buffers[i].m_pack;
			mh->m_flags |= M_PKTHDR;
			mh->m_len = le16toh(cur->wb.upper.length);
			dopayload = IGB_CLEAN_PAYLOAD;
		}

		if (staterr & E1000_RXD_STAT_EOP) {
			count--;
			eop = 1;
			/*
			** Strip CRC and account for frag
			*/
			if (mp) { 
				if (mp->m_len < ETHER_CRC_LEN) {
					/* a frag, how much is left? */
					len_adj = ETHER_CRC_LEN - mp->m_len;
					mp->m_len = 0;
				} else
					mp->m_len -= ETHER_CRC_LEN;
			} else { /* not split */
				if (mh->m_len < ETHER_CRC_LEN) {
					len_adj = ETHER_CRC_LEN - mh->m_len;
					mh->m_len = 0;
				} else
					mh->m_len -= ETHER_CRC_LEN;
			}
		} else 
			eop = 0;

		if (staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK)
			accept_frame = 0;
#ifdef IGB_IEEE1588
	This linux code needs to be converted to work here
	-----------------------------------------------------
               if (unlikely(staterr & E1000_RXD_STAT_TS)) {
                       u64 regval;
                       u64 ns;
// Create an mtag and set it up
                       struct skb_shared_hwtstamps *shhwtstamps =
                               skb_hwtstamps(skb);

                       rd32(E1000_TSYNCRXCTL) & E1000_TSYNCRXCTL_VALID),
                       "igb: no RX time stamp available for time stamped packet");
                       regval = rd32(E1000_RXSTMPL);
                       regval |= (u64)rd32(E1000_RXSTMPH) << 32;
// Do time conversion from the register
                       ns = timecounter_cyc2time(&adapter->clock, regval);
                       clocksync_update(&adapter->sync, ns);
                       memset(shhwtstamps, 0, sizeof(*shhwtstamps));
                       shhwtstamps->hwtstamp = ns_to_ktime(ns);
                       shhwtstamps->syststamp =
                               clocksync_hw2sys(&adapter->sync, ns);
               }
#endif
		if (accept_frame) {
			/*
			** get_buf will overwrite the writeback
			** descriptor so save the VLAN tag now.
			*/
			vtag = le16toh(cur->wb.upper.vlan);
			if (igb_get_buf(rxr, i, dopayload) != 0) {
				ifp->if_iqdrops++;
				goto discard;
			}
			/* Initial frame - setup */
			if (rxr->fmp == NULL) {
				mh->m_flags |= M_PKTHDR;
				mh->m_pkthdr.len = mh->m_len;
				rxr->fmp = mh; /* Store the first mbuf */
				rxr->lmp = mh;
				if (mp) { /* Add payload if split */
					mh->m_pkthdr.len += mp->m_len;
					rxr->lmp = mh->m_next;
				}
			} else {
				/* Chain mbuf's together */
				mh->m_flags &= ~M_PKTHDR;
				rxr->lmp->m_next = mh;
				rxr->lmp = rxr->lmp->m_next;
				rxr->fmp->m_pkthdr.len += mh->m_len;
				/* Adjust for CRC frag */
				if (len_adj) {
					rxr->lmp->m_len -= len_adj;
					rxr->fmp->m_pkthdr.len -= len_adj;
				}
			}

			if (eop) {
				bool sctp = ((ptype & 0x40) != 0);
				rxr->fmp->m_pkthdr.rcvif = ifp;
				ifp->if_ipackets++;
				rxr->rx_packets++;
				/* capture data for AIM */
				rxr->bytes += rxr->fmp->m_pkthdr.len;
				rxr->rx_bytes += rxr->fmp->m_pkthdr.len;

				igb_rx_checksum(staterr, rxr->fmp, sctp);
				if (staterr & E1000_RXD_STAT_VP) {
					rxr->fmp->m_pkthdr.ether_vtag = vtag;
					rxr->fmp->m_flags |= M_VLANTAG;
				}
#if __FreeBSD_version >= 800000
                                rxr->fmp->m_pkthdr.flowid = curcpu;
                                rxr->fmp->m_flags |= M_FLOWID;
#endif
				sendmp = rxr->fmp;
				rxr->fmp = NULL;
				rxr->lmp = NULL;
			}
		} else {
			ifp->if_ierrors++;
discard:
			/* Reuse loaded DMA map and just update mbuf chain */
			if (hlen) {
				mh = rxr->rx_buffers[i].m_head;
				mh->m_len = MHLEN;
				mh->m_next = NULL;
			}
			mp = rxr->rx_buffers[i].m_pack;
			mp->m_len = mp->m_pkthdr.len = adapter->rx_mbuf_sz;
			mp->m_data = mp->m_ext.ext_buf;
			mp->m_next = NULL;
			if (adapter->max_frame_size <=
			    (MCLBYTES - ETHER_ALIGN))
				m_adj(mp, ETHER_ALIGN);
			if (rxr->fmp != NULL) {
				/* handles the whole chain */
				m_freem(rxr->fmp);
				rxr->fmp = NULL;
				rxr->lmp = NULL;
			}
			sendmp = NULL;
		}

		bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
		    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);

		rxr->last_cleaned = i; /* For updating tail */

		/* Advance our pointers to the next descriptor. */
		if (++i == adapter->num_rx_desc)
			i = 0;
 
		/*
		** Note that we hold the RX lock thru
		** the following call so this ring's
		** next_to_check is not gonna change.
		*/
		if (sendmp != NULL) {
			/*
			** Send to the stack if:
			**  - LRO not enabled, or
			**  - no LRO resources, or
			**  - lro enqueue fails
			*/
			if ((!rxr->lro_enabled) ||
			    ((!lro->lro_cnt) || (tcp_lro_rx(lro, sendmp, 0))))
                                (*ifp->if_input)(ifp, sendmp);
                }

		/* Get the next descriptor */
		cur = &rxr->rx_base[i];
		staterr = cur->wb.upper.status_error;
	}
	rxr->next_to_check = i;

	/* Advance the E1000's Receive Queue #0  "Tail Pointer". */
	E1000_WRITE_REG(&adapter->hw, E1000_RDT(rxr->me), rxr->last_cleaned);

	/*
	 * Flush any outstanding LRO work
	 */
	while (!SLIST_EMPTY(&lro->lro_active)) {
		queued = SLIST_FIRST(&lro->lro_active);
		SLIST_REMOVE_HEAD(&lro->lro_active, next);
		tcp_lro_flush(lro, queued);
	}

	IGB_RX_UNLOCK(rxr);

	/*
	** We still have cleaning to do?
	** Schedule another interrupt if so.
	*/
	if (staterr & E1000_RXD_STAT_DD) {
		E1000_WRITE_REG(&adapter->hw, E1000_EICS, rxr->eims);
		return TRUE;
	}

	return FALSE;
}


/*********************************************************************
 *
 *  Verify that the hardware indicated that the checksum is valid.
 *  Inform the stack about the status of checksum so that stack
 *  doesn't spend time verifying the checksum.
 *
 *********************************************************************/
static void
igb_rx_checksum(u32 staterr, struct mbuf *mp, bool sctp)
{
	u16 status = (u16)staterr;
	u8  errors = (u8) (staterr >> 24);

	/* Ignore Checksum bit is set */
	if (status & E1000_RXD_STAT_IXSM) {
		mp->m_pkthdr.csum_flags = 0;
		return;
	}

	if (status & E1000_RXD_STAT_IPCS) {
		/* Did it pass? */
		if (!(errors & E1000_RXD_ERR_IPE)) {
			/* IP Checksum Good */
			mp->m_pkthdr.csum_flags = CSUM_IP_CHECKED;
			mp->m_pkthdr.csum_flags |= CSUM_IP_VALID;
		} else
			mp->m_pkthdr.csum_flags = 0;
	}

	if (status & (E1000_RXD_STAT_TCPCS | E1000_RXD_STAT_UDPCS)) {
		u16 type = (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
#if __FreeBSD_version >= 800000
		if (sctp) /* reassign */
			type = CSUM_SCTP_VALID;
#endif
		/* Did it pass? */
		if (!(errors & E1000_RXD_ERR_TCPE)) {
			mp->m_pkthdr.csum_flags |= type;
			if (!sctp)
				mp->m_pkthdr.csum_data = htons(0xffff);
		}
	}
	return;
}

/*
 * This routine is run via an vlan
 * config EVENT
 */
static void
igb_register_vlan(void *unused, struct ifnet *ifp, u16 vtag)
{
	struct adapter	*adapter = ifp->if_softc;
	u32		index, bit;

	if ((vtag == 0) || (vtag > 4095))       /* Invalid */
                return;

	index = (vtag >> 5) & 0x7F;
	bit = vtag & 0x1F;
	igb_shadow_vfta[index] |= (1 << bit);
	++adapter->num_vlans;
	/* Re-init to load the changes */
	igb_init(adapter);
}

/*
 * This routine is run via an vlan
 * unconfig EVENT
 */
static void
igb_unregister_vlan(void *unused, struct ifnet *ifp, u16 vtag)
{
	struct adapter	*adapter = ifp->if_softc;
	u32		index, bit;

	if ((vtag == 0) || (vtag > 4095))       /* Invalid */
                return;

	index = (vtag >> 5) & 0x7F;
	bit = vtag & 0x1F;
	igb_shadow_vfta[index] &= ~(1 << bit);
	--adapter->num_vlans;
	/* Re-init to load the changes */
	igb_init(adapter);
}

static void
igb_setup_vlan_hw_support(struct adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	u32             reg;

	/*
	** We get here thru init_locked, meaning
	** a soft reset, this has already cleared
	** the VFTA and other state, so if there
	** have been no vlan's registered do nothing.
	*/
	if (adapter->num_vlans == 0)
                return;

	/*
	** A soft reset zero's out the VFTA, so
	** we need to repopulate it now.
	*/
	for (int i = 0; i < IGB_VFTA_SIZE; i++)
                if (igb_shadow_vfta[i] != 0)
			E1000_WRITE_REG_ARRAY(hw, E1000_VFTA,
                            i, igb_shadow_vfta[i]);

	reg = E1000_READ_REG(hw, E1000_CTRL);
	reg |= E1000_CTRL_VME;
	E1000_WRITE_REG(hw, E1000_CTRL, reg);

	/* Enable the Filter Table */
	reg = E1000_READ_REG(hw, E1000_RCTL);
	reg &= ~E1000_RCTL_CFIEN;
	reg |= E1000_RCTL_VFE;
	E1000_WRITE_REG(hw, E1000_RCTL, reg);

	/* Update the frame size */
	E1000_WRITE_REG(&adapter->hw, E1000_RLPML,
	    adapter->max_frame_size + VLAN_TAG_SIZE);
}

static void
igb_enable_intr(struct adapter *adapter)
{
	/* With RSS set up what to auto clear */
	if (adapter->msix_mem) {
		E1000_WRITE_REG(&adapter->hw, E1000_EIAC,
		    adapter->eims_mask);
		E1000_WRITE_REG(&adapter->hw, E1000_EIAM,
		    adapter->eims_mask);
		E1000_WRITE_REG(&adapter->hw, E1000_EIMS,
		    adapter->eims_mask);
		E1000_WRITE_REG(&adapter->hw, E1000_IMS,
		    E1000_IMS_LSC);
	} else {
		E1000_WRITE_REG(&adapter->hw, E1000_IMS,
		    IMS_ENABLE_MASK);
	}
	E1000_WRITE_FLUSH(&adapter->hw);

	return;
}

static void
igb_disable_intr(struct adapter *adapter)
{
	if (adapter->msix_mem) {
		E1000_WRITE_REG(&adapter->hw, E1000_EIMC, ~0);
		E1000_WRITE_REG(&adapter->hw, E1000_EIAC, 0);
	} 
	E1000_WRITE_REG(&adapter->hw, E1000_IMC, ~0);
	E1000_WRITE_FLUSH(&adapter->hw);
	return;
}

/*
 * Bit of a misnomer, what this really means is
 * to enable OS management of the system... aka
 * to disable special hardware management features 
 */
static void
igb_init_manageability(struct adapter *adapter)
{
	if (adapter->has_manage) {
		int manc2h = E1000_READ_REG(&adapter->hw, E1000_MANC2H);
		int manc = E1000_READ_REG(&adapter->hw, E1000_MANC);

		/* disable hardware interception of ARP */
		manc &= ~(E1000_MANC_ARP_EN);

                /* enable receiving management packets to the host */
		manc |= E1000_MANC_EN_MNG2HOST;
		manc2h |= 1 << 5;  /* Mng Port 623 */
		manc2h |= 1 << 6;  /* Mng Port 664 */
		E1000_WRITE_REG(&adapter->hw, E1000_MANC2H, manc2h);
		E1000_WRITE_REG(&adapter->hw, E1000_MANC, manc);
	}
}

/*
 * Give control back to hardware management
 * controller if there is one.
 */
static void
igb_release_manageability(struct adapter *adapter)
{
	if (adapter->has_manage) {
		int manc = E1000_READ_REG(&adapter->hw, E1000_MANC);

		/* re-enable hardware interception of ARP */
		manc |= E1000_MANC_ARP_EN;
		manc &= ~E1000_MANC_EN_MNG2HOST;

		E1000_WRITE_REG(&adapter->hw, E1000_MANC, manc);
	}
}

/*
 * igb_get_hw_control sets CTRL_EXT:DRV_LOAD bit.
 * For ASF and Pass Through versions of f/w this means that
 * the driver is loaded. 
 *
 */
static void
igb_get_hw_control(struct adapter *adapter)
{
	u32 ctrl_ext;

	/* Let firmware know the driver has taken over */
	ctrl_ext = E1000_READ_REG(&adapter->hw, E1000_CTRL_EXT);
	E1000_WRITE_REG(&adapter->hw, E1000_CTRL_EXT,
	    ctrl_ext | E1000_CTRL_EXT_DRV_LOAD);
}

/*
 * igb_release_hw_control resets CTRL_EXT:DRV_LOAD bit.
 * For ASF and Pass Through versions of f/w this means that the
 * driver is no longer loaded.
 *
 */
static void
igb_release_hw_control(struct adapter *adapter)
{
	u32 ctrl_ext;

	/* Let firmware taken over control of h/w */
	ctrl_ext = E1000_READ_REG(&adapter->hw, E1000_CTRL_EXT);
	E1000_WRITE_REG(&adapter->hw, E1000_CTRL_EXT,
	    ctrl_ext & ~E1000_CTRL_EXT_DRV_LOAD);
}

static int
igb_is_valid_ether_addr(uint8_t *addr)
{
	char zero_addr[6] = { 0, 0, 0, 0, 0, 0 };

	if ((addr[0] & 1) || (!bcmp(addr, zero_addr, ETHER_ADDR_LEN))) {
		return (FALSE);
	}

	return (TRUE);
}


/*
 * Enable PCI Wake On Lan capability
 */
void
igb_enable_wakeup(device_t dev)
{
	u16     cap, status;
	u8      id;

	/* First find the capabilities pointer*/
	cap = pci_read_config(dev, PCIR_CAP_PTR, 2);
	/* Read the PM Capabilities */
	id = pci_read_config(dev, cap, 1);
	if (id != PCIY_PMG)     /* Something wrong */
		return;
	/* OK, we have the power capabilities, so
	   now get the status register */
	cap += PCIR_POWER_STATUS;
	status = pci_read_config(dev, cap, 2);
	status |= PCIM_PSTAT_PME | PCIM_PSTAT_PMEENABLE;
	pci_write_config(dev, cap, status, 2);
	return;
}


/**********************************************************************
 *
 *  Update the board statistics counters.
 *
 **********************************************************************/
static void
igb_update_stats_counters(struct adapter *adapter)
{
	struct ifnet   *ifp;

	if(adapter->hw.phy.media_type == e1000_media_type_copper ||
	   (E1000_READ_REG(&adapter->hw, E1000_STATUS) & E1000_STATUS_LU)) {
		adapter->stats.symerrs += E1000_READ_REG(&adapter->hw, E1000_SYMERRS);
		adapter->stats.sec += E1000_READ_REG(&adapter->hw, E1000_SEC);
	}
	adapter->stats.crcerrs += E1000_READ_REG(&adapter->hw, E1000_CRCERRS);
	adapter->stats.mpc += E1000_READ_REG(&adapter->hw, E1000_MPC);
	adapter->stats.scc += E1000_READ_REG(&adapter->hw, E1000_SCC);
	adapter->stats.ecol += E1000_READ_REG(&adapter->hw, E1000_ECOL);

	adapter->stats.mcc += E1000_READ_REG(&adapter->hw, E1000_MCC);
	adapter->stats.latecol += E1000_READ_REG(&adapter->hw, E1000_LATECOL);
	adapter->stats.colc += E1000_READ_REG(&adapter->hw, E1000_COLC);
	adapter->stats.dc += E1000_READ_REG(&adapter->hw, E1000_DC);
	adapter->stats.rlec += E1000_READ_REG(&adapter->hw, E1000_RLEC);
	adapter->stats.xonrxc += E1000_READ_REG(&adapter->hw, E1000_XONRXC);
	adapter->stats.xontxc += E1000_READ_REG(&adapter->hw, E1000_XONTXC);
	adapter->stats.xoffrxc += E1000_READ_REG(&adapter->hw, E1000_XOFFRXC);
	adapter->stats.xofftxc += E1000_READ_REG(&adapter->hw, E1000_XOFFTXC);
	adapter->stats.fcruc += E1000_READ_REG(&adapter->hw, E1000_FCRUC);
	adapter->stats.prc64 += E1000_READ_REG(&adapter->hw, E1000_PRC64);
	adapter->stats.prc127 += E1000_READ_REG(&adapter->hw, E1000_PRC127);
	adapter->stats.prc255 += E1000_READ_REG(&adapter->hw, E1000_PRC255);
	adapter->stats.prc511 += E1000_READ_REG(&adapter->hw, E1000_PRC511);
	adapter->stats.prc1023 += E1000_READ_REG(&adapter->hw, E1000_PRC1023);
	adapter->stats.prc1522 += E1000_READ_REG(&adapter->hw, E1000_PRC1522);
	adapter->stats.gprc += E1000_READ_REG(&adapter->hw, E1000_GPRC);
	adapter->stats.bprc += E1000_READ_REG(&adapter->hw, E1000_BPRC);
	adapter->stats.mprc += E1000_READ_REG(&adapter->hw, E1000_MPRC);
	adapter->stats.gptc += E1000_READ_REG(&adapter->hw, E1000_GPTC);

	/* For the 64-bit byte counters the low dword must be read first. */
	/* Both registers clear on the read of the high dword */

	adapter->stats.gorc += E1000_READ_REG(&adapter->hw, E1000_GORCH);
	adapter->stats.gotc += E1000_READ_REG(&adapter->hw, E1000_GOTCH);

	adapter->stats.rnbc += E1000_READ_REG(&adapter->hw, E1000_RNBC);
	adapter->stats.ruc += E1000_READ_REG(&adapter->hw, E1000_RUC);
	adapter->stats.rfc += E1000_READ_REG(&adapter->hw, E1000_RFC);
	adapter->stats.roc += E1000_READ_REG(&adapter->hw, E1000_ROC);
	adapter->stats.rjc += E1000_READ_REG(&adapter->hw, E1000_RJC);

	adapter->stats.tor += E1000_READ_REG(&adapter->hw, E1000_TORH);
	adapter->stats.tot += E1000_READ_REG(&adapter->hw, E1000_TOTH);

	adapter->stats.tpr += E1000_READ_REG(&adapter->hw, E1000_TPR);
	adapter->stats.tpt += E1000_READ_REG(&adapter->hw, E1000_TPT);
	adapter->stats.ptc64 += E1000_READ_REG(&adapter->hw, E1000_PTC64);
	adapter->stats.ptc127 += E1000_READ_REG(&adapter->hw, E1000_PTC127);
	adapter->stats.ptc255 += E1000_READ_REG(&adapter->hw, E1000_PTC255);
	adapter->stats.ptc511 += E1000_READ_REG(&adapter->hw, E1000_PTC511);
	adapter->stats.ptc1023 += E1000_READ_REG(&adapter->hw, E1000_PTC1023);
	adapter->stats.ptc1522 += E1000_READ_REG(&adapter->hw, E1000_PTC1522);
	adapter->stats.mptc += E1000_READ_REG(&adapter->hw, E1000_MPTC);
	adapter->stats.bptc += E1000_READ_REG(&adapter->hw, E1000_BPTC);

	adapter->stats.algnerrc += 
		E1000_READ_REG(&adapter->hw, E1000_ALGNERRC);
	adapter->stats.rxerrc += 
		E1000_READ_REG(&adapter->hw, E1000_RXERRC);
	adapter->stats.tncrs += 
		E1000_READ_REG(&adapter->hw, E1000_TNCRS);
	adapter->stats.cexterr += 
		E1000_READ_REG(&adapter->hw, E1000_CEXTERR);
	adapter->stats.tsctc += 
		E1000_READ_REG(&adapter->hw, E1000_TSCTC);
	adapter->stats.tsctfc += 
		E1000_READ_REG(&adapter->hw, E1000_TSCTFC);
	ifp = adapter->ifp;

	ifp->if_collisions = adapter->stats.colc;

	/* Rx Errors */
	ifp->if_ierrors = adapter->dropped_pkts + adapter->stats.rxerrc +
	    adapter->stats.crcerrs + adapter->stats.algnerrc +
	    adapter->stats.ruc + adapter->stats.roc +
	    adapter->stats.mpc + adapter->stats.cexterr;

	/* Tx Errors */
	ifp->if_oerrors = adapter->stats.ecol +
	    adapter->stats.latecol + adapter->watchdog_events;
}


/**********************************************************************
 *
 *  This routine is called only when igb_display_debug_stats is enabled.
 *  This routine provides a way to take a look at important statistics
 *  maintained by the driver and hardware.
 *
 **********************************************************************/
static void
igb_print_debug_info(struct adapter *adapter)
{
	device_t dev = adapter->dev;
	struct rx_ring *rxr = adapter->rx_rings;
	struct tx_ring *txr = adapter->tx_rings;
	uint8_t *hw_addr = adapter->hw.hw_addr;

	device_printf(dev, "Adapter hardware address = %p \n", hw_addr);
	device_printf(dev, "CTRL = 0x%x RCTL = 0x%x \n",
	    E1000_READ_REG(&adapter->hw, E1000_CTRL),
	    E1000_READ_REG(&adapter->hw, E1000_RCTL));

#if	(DEBUG_HW > 0)  /* Dont output these errors normally */
	device_printf(dev, "IMS = 0x%x EIMS = 0x%x \n",
	    E1000_READ_REG(&adapter->hw, E1000_IMS),
	    E1000_READ_REG(&adapter->hw, E1000_EIMS));
#endif

	device_printf(dev, "Packet buffer = Tx=%dk Rx=%dk \n",
	    ((E1000_READ_REG(&adapter->hw, E1000_PBA) & 0xffff0000) >> 16),\
	    (E1000_READ_REG(&adapter->hw, E1000_PBA) & 0xffff) );
	device_printf(dev, "Flow control watermarks high = %d low = %d\n",
	    adapter->hw.fc.high_water,
	    adapter->hw.fc.low_water);

	for (int i = 0; i < adapter->num_queues; i++, txr++) {
		device_printf(dev, "Queue(%d) tdh = %d, tdt = %d\n", i,
		    E1000_READ_REG(&adapter->hw, E1000_TDH(i)),
		    E1000_READ_REG(&adapter->hw, E1000_TDT(i)));
		device_printf(dev, "TX(%d) no descriptors avail event = %lld\n",
		    txr->me, (long long)txr->no_desc_avail);
		device_printf(dev, "TX(%d) MSIX IRQ Handled = %lld\n", txr->me,
		    (long long)txr->tx_irq);
		device_printf(dev, "TX(%d) Packets sent = %lld\n", txr->me,
		    (long long)txr->tx_packets);
	}

	for (int i = 0; i < adapter->num_queues; i++, rxr++) {
		struct lro_ctrl *lro = &rxr->lro;
		device_printf(dev, "Queue(%d) rdh = %d, rdt = %d\n", i,
		    E1000_READ_REG(&adapter->hw, E1000_RDH(i)),
		    E1000_READ_REG(&adapter->hw, E1000_RDT(i)));
		device_printf(dev, "RX(%d) Packets received = %lld\n", rxr->me,
		    (long long)rxr->rx_packets);
		device_printf(dev, "RX(%d) Split Packets = %lld\n", rxr->me,
		    (long long)rxr->rx_split_packets);
		device_printf(dev, "RX(%d) Byte count = %lld\n", rxr->me,
		    (long long)rxr->rx_bytes);
		device_printf(dev, "RX(%d) MSIX IRQ Handled = %lld\n", rxr->me,
		    (long long)rxr->rx_irq);
		device_printf(dev,"RX(%d) LRO Queued= %d\n",
		    rxr->me, lro->lro_queued);
		device_printf(dev,"RX(%d) LRO Flushed= %d\n",
		    rxr->me, lro->lro_flushed);
	}

	device_printf(dev, "LINK MSIX IRQ Handled = %u\n", adapter->link_irq);

	device_printf(dev, "Mbuf defrag failed = %ld\n",
	    adapter->mbuf_defrag_failed);
	device_printf(dev, "Std mbuf header failed = %ld\n",
	    adapter->mbuf_header_failed);
	device_printf(dev, "Std mbuf packet failed = %ld\n",
	    adapter->mbuf_packet_failed);
	device_printf(dev, "Driver dropped packets = %ld\n",
	    adapter->dropped_pkts);
	device_printf(dev, "Driver tx dma failure in xmit = %ld\n",
		adapter->no_tx_dma_setup);
}

static void
igb_print_hw_stats(struct adapter *adapter)
{
	device_t dev = adapter->dev;

	device_printf(dev, "Excessive collisions = %lld\n",
	    (long long)adapter->stats.ecol);
#if	(DEBUG_HW > 0)  /* Dont output these errors normally */
	device_printf(dev, "Symbol errors = %lld\n",
	    (long long)adapter->stats.symerrs);
#endif
	device_printf(dev, "Sequence errors = %lld\n",
	    (long long)adapter->stats.sec);
	device_printf(dev, "Defer count = %lld\n",
	    (long long)adapter->stats.dc);
	device_printf(dev, "Missed Packets = %lld\n",
	    (long long)adapter->stats.mpc);
	device_printf(dev, "Receive No Buffers = %lld\n",
	    (long long)adapter->stats.rnbc);
	/* RLEC is inaccurate on some hardware, calculate our own. */
	device_printf(dev, "Receive Length Errors = %lld\n",
	    ((long long)adapter->stats.roc + (long long)adapter->stats.ruc));
	device_printf(dev, "Receive errors = %lld\n",
	    (long long)adapter->stats.rxerrc);
	device_printf(dev, "Crc errors = %lld\n",
	    (long long)adapter->stats.crcerrs);
	device_printf(dev, "Alignment errors = %lld\n",
	    (long long)adapter->stats.algnerrc);
	/* On 82575 these are collision counts */
	device_printf(dev, "Collision/Carrier extension errors = %lld\n",
	    (long long)adapter->stats.cexterr);
	device_printf(dev, "RX overruns = %ld\n", adapter->rx_overruns);
	device_printf(dev, "watchdog timeouts = %ld\n",
	    adapter->watchdog_events);
	device_printf(dev, "XON Rcvd = %lld\n",
	    (long long)adapter->stats.xonrxc);
	device_printf(dev, "XON Xmtd = %lld\n",
	    (long long)adapter->stats.xontxc);
	device_printf(dev, "XOFF Rcvd = %lld\n",
	    (long long)adapter->stats.xoffrxc);
	device_printf(dev, "XOFF Xmtd = %lld\n",
	    (long long)adapter->stats.xofftxc);
	device_printf(dev, "Good Packets Rcvd = %lld\n",
	    (long long)adapter->stats.gprc);
	device_printf(dev, "Good Packets Xmtd = %lld\n",
	    (long long)adapter->stats.gptc);
	device_printf(dev, "TSO Contexts Xmtd = %lld\n",
	    (long long)adapter->stats.tsctc);
	device_printf(dev, "TSO Contexts Failed = %lld\n",
	    (long long)adapter->stats.tsctfc);
}

/**********************************************************************
 *
 *  This routine provides a way to dump out the adapter eeprom,
 *  often a useful debug/service tool. This only dumps the first
 *  32 words, stuff that matters is in that extent.
 *
 **********************************************************************/
static void
igb_print_nvm_info(struct adapter *adapter)
{
	u16	eeprom_data;
	int	i, j, row = 0;

	/* Its a bit crude, but it gets the job done */
	printf("\nInterface EEPROM Dump:\n");
	printf("Offset\n0x0000  ");
	for (i = 0, j = 0; i < 32; i++, j++) {
		if (j == 8) { /* Make the offset block */
			j = 0; ++row;
			printf("\n0x00%x0  ",row);
		}
		e1000_read_nvm(&adapter->hw, i, 1, &eeprom_data);
		printf("%04x ", eeprom_data);
	}
	printf("\n");
}

static int
igb_sysctl_debug_info(SYSCTL_HANDLER_ARGS)
{
	struct adapter *adapter;
	int error;
	int result;

	result = -1;
	error = sysctl_handle_int(oidp, &result, 0, req);

	if (error || !req->newptr)
		return (error);

	if (result == 1) {
		adapter = (struct adapter *)arg1;
		igb_print_debug_info(adapter);
	}
	/*
	 * This value will cause a hex dump of the
	 * first 32 16-bit words of the EEPROM to
	 * the screen.
	 */
	if (result == 2) {
		adapter = (struct adapter *)arg1;
		igb_print_nvm_info(adapter);
        }

	return (error);
}


static int
igb_sysctl_stats(SYSCTL_HANDLER_ARGS)
{
	struct adapter *adapter;
	int error;
	int result;

	result = -1;
	error = sysctl_handle_int(oidp, &result, 0, req);

	if (error || !req->newptr)
		return (error);

	if (result == 1) {
		adapter = (struct adapter *)arg1;
		igb_print_hw_stats(adapter);
	}

	return (error);
}

static void
igb_add_rx_process_limit(struct adapter *adapter, const char *name,
	const char *description, int *limit, int value)
{
	*limit = value;
	SYSCTL_ADD_INT(device_get_sysctl_ctx(adapter->dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(adapter->dev)),
	    OID_AUTO, name, CTLTYPE_INT|CTLFLAG_RW, limit, value, description);
}

#ifdef IGB_IEEE1588
/*
** igb_hwtstamp_ioctl - control hardware time stamping
**
** Outgoing time stamping can be enabled and disabled. Play nice and
** disable it when requested, although it shouldn't case any overhead
** when no packet needs it. At most one packet in the queue may be
** marked for time stamping, otherwise it would be impossible to tell
** for sure to which packet the hardware time stamp belongs.
**
** Incoming time stamping has to be configured via the hardware
** filters. Not all combinations are supported, in particular event
** type has to be specified. Matching the kind of event packet is
** not supported, with the exception of "all V2 events regardless of
** level 2 or 4".
**
*/
static int
igb_hwtstamp_ioctl(struct adapter *adapter, struct ifreq *ifr)
{
	struct e1000_hw *hw = &adapter->hw;
	struct hwtstamp_ctrl *config;
	u32 tsync_tx_ctl_bit = E1000_TSYNCTXCTL_ENABLED;
	u32 tsync_rx_ctl_bit = E1000_TSYNCRXCTL_ENABLED;
	u32 tsync_rx_ctl_type = 0;
	u32 tsync_rx_cfg = 0;
	int is_l4 = 0;
	int is_l2 = 0;
	u16 port = 319; /* PTP */
	u32 regval;

	config = (struct hwtstamp_ctrl *) ifr->ifr_data;

	/* reserved for future extensions */
	if (config->flags)
		return (EINVAL);

	switch (config->tx_type) {
	case HWTSTAMP_TX_OFF:
		tsync_tx_ctl_bit = 0;
		break;
	case HWTSTAMP_TX_ON:
		tsync_tx_ctl_bit = E1000_TSYNCTXCTL_ENABLED;
		break;
	default:
		return (ERANGE);
	}

	switch (config->rx_filter) {
	case HWTSTAMP_FILTER_NONE:
		tsync_rx_ctl_bit = 0;
		break;
	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
	case HWTSTAMP_FILTER_ALL:
		/*
		 * register TSYNCRXCFG must be set, therefore it is not
		 * possible to time stamp both Sync and Delay_Req messages
		 * => fall back to time stamping all packets
		 */
		tsync_rx_ctl_type = E1000_TSYNCRXCTL_TYPE_ALL;
		config->rx_filter = HWTSTAMP_FILTER_ALL;
		break;
	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
		tsync_rx_ctl_type = E1000_TSYNCRXCTL_TYPE_L4_V1;
		tsync_rx_cfg = E1000_TSYNCRXCFG_PTP_V1_SYNC_MESSAGE;
		is_l4 = 1;
		break;
	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
		tsync_rx_ctl_type = E1000_TSYNCRXCTL_TYPE_L4_V1;
		tsync_rx_cfg = E1000_TSYNCRXCFG_PTP_V1_DELAY_REQ_MESSAGE;
		is_l4 = 1;
		break;
	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
		tsync_rx_ctl_type = E1000_TSYNCRXCTL_TYPE_L2_L4_V2;
		tsync_rx_cfg = E1000_TSYNCRXCFG_PTP_V2_SYNC_MESSAGE;
		is_l2 = 1;
		is_l4 = 1;
		config->rx_filter = HWTSTAMP_FILTER_SOME;
		break;
	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
		tsync_rx_ctl_type = E1000_TSYNCRXCTL_TYPE_L2_L4_V2;
		tsync_rx_cfg = E1000_TSYNCRXCFG_PTP_V2_DELAY_REQ_MESSAGE;
		is_l2 = 1;
		is_l4 = 1;
		config->rx_filter = HWTSTAMP_FILTER_SOME;
		break;
	case HWTSTAMP_FILTER_PTP_V2_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
		tsync_rx_ctl_type = E1000_TSYNCRXCTL_TYPE_EVENT_V2;
		config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
		is_l2 = 1;
		break;
	default:
		return -ERANGE;
	}

	/* enable/disable TX */
	regval = E1000_READ_REG(hw, E1000_TSYNCTXCTL);
	regval = (regval & ~E1000_TSYNCTXCTL_ENABLED) | tsync_tx_ctl_bit;
	E1000_WRITE_REG(hw, E1000_TSYNCTXCTL, regval);

	/* enable/disable RX, define which PTP packets are time stamped */
	regval = E1000_READ_REG(hw, E1000_TSYNCRXCTL);
	regval = (regval & ~E1000_TSYNCRXCTL_ENABLED) | tsync_rx_ctl_bit;
	regval = (regval & ~0xE) | tsync_rx_ctl_type;
	E1000_WRITE_REG(hw, E1000_TSYNCRXCTL, regval);
	E1000_WRITE_REG(hw, E1000_TSYNCRXCFG, tsync_rx_cfg);

	/*
	 * Ethertype Filter Queue Filter[0][15:0] = 0x88F7
	 *                                          (Ethertype to filter on)
	 * Ethertype Filter Queue Filter[0][26] = 0x1 (Enable filter)
	 * Ethertype Filter Queue Filter[0][30] = 0x1 (Enable Timestamping)
	 */
	E1000_WRITE_REG(hw, E1000_ETQF0, is_l2 ? 0x440088f7 : 0);

	/* L4 Queue Filter[0]: only filter by source and destination port */
	E1000_WRITE_REG(hw, E1000_SPQF0, htons(port));
	E1000_WRITE_REG(hw, E1000_IMIREXT(0), is_l4 ?
	     ((1<<12) | (1<<19) /* bypass size and control flags */) : 0);
	E1000_WRITE_REG(hw, E1000_IMIR(0), is_l4 ?
	     (htons(port)
	      | (0<<16) /* immediate interrupt disabled */
	      | 0 /* (1<<17) bit cleared: do not bypass
		     destination port check */)
		: 0);
	E1000_WRITE_REG(hw, E1000_FTQF0, is_l4 ?
	     (0x11 /* UDP */
	      | (1<<15) /* VF not compared */
	      | (1<<27) /* Enable Timestamping */
	      | (7<<28) /* only source port filter enabled,
			   source/target address and protocol
			   masked */)
	     : ((1<<15) | (15<<28) /* all mask bits set = filter not
				      enabled */));

	wrfl();

	adapter->hwtstamp_ctrl = config;

	/* clear TX/RX time stamp registers, just to be sure */
	regval = E1000_READ_REG(hw, E1000_TXSTMPH);
	regval = E1000_READ_REG(hw, E1000_RXSTMPH);

	return (error);
}

/*
** igb_read_clock - read raw cycle counter (to be used by time counter)
*/
static cycle_t igb_read_clock(const struct cyclecounter *tc)
{
       struct igb_adapter *adapter =
               container_of(tc, struct igb_adapter, cycles);
       struct e1000_hw *hw = &adapter->hw;
       u64 stamp;

       stamp =  E1000_READ_REG(hw, E1000_SYSTIML);
       stamp |= (u64)E1000_READ_REG(hw, E1000_SYSTIMH) << 32ULL;

       return (stamp);
}

#endif /* IGB_IEEE1588 */
OpenPOWER on IntegriCloud