summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/intel/i40e/i40e_txrx.c
blob: 120c68f78951dd1ae7a2218b4b64c049aee40340 (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
/*******************************************************************************
 *
 * Intel Ethernet Controller XL710 Family Linux Driver
 * Copyright(c) 2013 - 2016 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 * Contact Information:
 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 ******************************************************************************/

#include <linux/prefetch.h>
#include <net/busy_poll.h>
#include <linux/bpf_trace.h>
#include "i40e.h"
#include "i40e_trace.h"
#include "i40e_prototype.h"

static inline __le64 build_ctob(u32 td_cmd, u32 td_offset, unsigned int size,
				u32 td_tag)
{
	return cpu_to_le64(I40E_TX_DESC_DTYPE_DATA |
			   ((u64)td_cmd  << I40E_TXD_QW1_CMD_SHIFT) |
			   ((u64)td_offset << I40E_TXD_QW1_OFFSET_SHIFT) |
			   ((u64)size  << I40E_TXD_QW1_TX_BUF_SZ_SHIFT) |
			   ((u64)td_tag  << I40E_TXD_QW1_L2TAG1_SHIFT));
}

#define I40E_TXD_CMD (I40E_TX_DESC_CMD_EOP | I40E_TX_DESC_CMD_RS)
/**
 * i40e_fdir - Generate a Flow Director descriptor based on fdata
 * @tx_ring: Tx ring to send buffer on
 * @fdata: Flow director filter data
 * @add: Indicate if we are adding a rule or deleting one
 *
 **/
static void i40e_fdir(struct i40e_ring *tx_ring,
		      struct i40e_fdir_filter *fdata, bool add)
{
	struct i40e_filter_program_desc *fdir_desc;
	struct i40e_pf *pf = tx_ring->vsi->back;
	u32 flex_ptype, dtype_cmd;
	u16 i;

	/* grab the next descriptor */
	i = tx_ring->next_to_use;
	fdir_desc = I40E_TX_FDIRDESC(tx_ring, i);

	i++;
	tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;

	flex_ptype = I40E_TXD_FLTR_QW0_QINDEX_MASK &
		     (fdata->q_index << I40E_TXD_FLTR_QW0_QINDEX_SHIFT);

	flex_ptype |= I40E_TXD_FLTR_QW0_FLEXOFF_MASK &
		      (fdata->flex_off << I40E_TXD_FLTR_QW0_FLEXOFF_SHIFT);

	flex_ptype |= I40E_TXD_FLTR_QW0_PCTYPE_MASK &
		      (fdata->pctype << I40E_TXD_FLTR_QW0_PCTYPE_SHIFT);

	flex_ptype |= I40E_TXD_FLTR_QW0_PCTYPE_MASK &
		      (fdata->flex_offset << I40E_TXD_FLTR_QW0_FLEXOFF_SHIFT);

	/* Use LAN VSI Id if not programmed by user */
	flex_ptype |= I40E_TXD_FLTR_QW0_DEST_VSI_MASK &
		      ((u32)(fdata->dest_vsi ? : pf->vsi[pf->lan_vsi]->id) <<
		       I40E_TXD_FLTR_QW0_DEST_VSI_SHIFT);

	dtype_cmd = I40E_TX_DESC_DTYPE_FILTER_PROG;

	dtype_cmd |= add ?
		     I40E_FILTER_PROGRAM_DESC_PCMD_ADD_UPDATE <<
		     I40E_TXD_FLTR_QW1_PCMD_SHIFT :
		     I40E_FILTER_PROGRAM_DESC_PCMD_REMOVE <<
		     I40E_TXD_FLTR_QW1_PCMD_SHIFT;

	dtype_cmd |= I40E_TXD_FLTR_QW1_DEST_MASK &
		     (fdata->dest_ctl << I40E_TXD_FLTR_QW1_DEST_SHIFT);

	dtype_cmd |= I40E_TXD_FLTR_QW1_FD_STATUS_MASK &
		     (fdata->fd_status << I40E_TXD_FLTR_QW1_FD_STATUS_SHIFT);

	if (fdata->cnt_index) {
		dtype_cmd |= I40E_TXD_FLTR_QW1_CNT_ENA_MASK;
		dtype_cmd |= I40E_TXD_FLTR_QW1_CNTINDEX_MASK &
			     ((u32)fdata->cnt_index <<
			      I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT);
	}

	fdir_desc->qindex_flex_ptype_vsi = cpu_to_le32(flex_ptype);
	fdir_desc->rsvd = cpu_to_le32(0);
	fdir_desc->dtype_cmd_cntindex = cpu_to_le32(dtype_cmd);
	fdir_desc->fd_id = cpu_to_le32(fdata->fd_id);
}

#define I40E_FD_CLEAN_DELAY 10
/**
 * i40e_program_fdir_filter - Program a Flow Director filter
 * @fdir_data: Packet data that will be filter parameters
 * @raw_packet: the pre-allocated packet buffer for FDir
 * @pf: The PF pointer
 * @add: True for add/update, False for remove
 **/
static int i40e_program_fdir_filter(struct i40e_fdir_filter *fdir_data,
				    u8 *raw_packet, struct i40e_pf *pf,
				    bool add)
{
	struct i40e_tx_buffer *tx_buf, *first;
	struct i40e_tx_desc *tx_desc;
	struct i40e_ring *tx_ring;
	struct i40e_vsi *vsi;
	struct device *dev;
	dma_addr_t dma;
	u32 td_cmd = 0;
	u16 i;

	/* find existing FDIR VSI */
	vsi = i40e_find_vsi_by_type(pf, I40E_VSI_FDIR);
	if (!vsi)
		return -ENOENT;

	tx_ring = vsi->tx_rings[0];
	dev = tx_ring->dev;

	/* we need two descriptors to add/del a filter and we can wait */
	for (i = I40E_FD_CLEAN_DELAY; I40E_DESC_UNUSED(tx_ring) < 2; i--) {
		if (!i)
			return -EAGAIN;
		msleep_interruptible(1);
	}

	dma = dma_map_single(dev, raw_packet,
			     I40E_FDIR_MAX_RAW_PACKET_SIZE, DMA_TO_DEVICE);
	if (dma_mapping_error(dev, dma))
		goto dma_fail;

	/* grab the next descriptor */
	i = tx_ring->next_to_use;
	first = &tx_ring->tx_bi[i];
	i40e_fdir(tx_ring, fdir_data, add);

	/* Now program a dummy descriptor */
	i = tx_ring->next_to_use;
	tx_desc = I40E_TX_DESC(tx_ring, i);
	tx_buf = &tx_ring->tx_bi[i];

	tx_ring->next_to_use = ((i + 1) < tx_ring->count) ? i + 1 : 0;

	memset(tx_buf, 0, sizeof(struct i40e_tx_buffer));

	/* record length, and DMA address */
	dma_unmap_len_set(tx_buf, len, I40E_FDIR_MAX_RAW_PACKET_SIZE);
	dma_unmap_addr_set(tx_buf, dma, dma);

	tx_desc->buffer_addr = cpu_to_le64(dma);
	td_cmd = I40E_TXD_CMD | I40E_TX_DESC_CMD_DUMMY;

	tx_buf->tx_flags = I40E_TX_FLAGS_FD_SB;
	tx_buf->raw_buf = (void *)raw_packet;

	tx_desc->cmd_type_offset_bsz =
		build_ctob(td_cmd, 0, I40E_FDIR_MAX_RAW_PACKET_SIZE, 0);

	/* Force memory writes to complete before letting h/w
	 * know there are new descriptors to fetch.
	 */
	wmb();

	/* Mark the data descriptor to be watched */
	first->next_to_watch = tx_desc;

	writel(tx_ring->next_to_use, tx_ring->tail);
	return 0;

dma_fail:
	return -1;
}

#define IP_HEADER_OFFSET 14
#define I40E_UDPIP_DUMMY_PACKET_LEN 42
/**
 * i40e_add_del_fdir_udpv4 - Add/Remove UDPv4 filters
 * @vsi: pointer to the targeted VSI
 * @fd_data: the flow director data required for the FDir descriptor
 * @add: true adds a filter, false removes it
 *
 * Returns 0 if the filters were successfully added or removed
 **/
static int i40e_add_del_fdir_udpv4(struct i40e_vsi *vsi,
				   struct i40e_fdir_filter *fd_data,
				   bool add)
{
	struct i40e_pf *pf = vsi->back;
	struct udphdr *udp;
	struct iphdr *ip;
	u8 *raw_packet;
	int ret;
	static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0,
		0x45, 0, 0, 0x1c, 0, 0, 0x40, 0, 0x40, 0x11, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

	raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL);
	if (!raw_packet)
		return -ENOMEM;
	memcpy(raw_packet, packet, I40E_UDPIP_DUMMY_PACKET_LEN);

	ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET);
	udp = (struct udphdr *)(raw_packet + IP_HEADER_OFFSET
	      + sizeof(struct iphdr));

	ip->daddr = fd_data->dst_ip;
	udp->dest = fd_data->dst_port;
	ip->saddr = fd_data->src_ip;
	udp->source = fd_data->src_port;

	if (fd_data->flex_filter) {
		u8 *payload = raw_packet + I40E_UDPIP_DUMMY_PACKET_LEN;
		__be16 pattern = fd_data->flex_word;
		u16 off = fd_data->flex_offset;

		*((__force __be16 *)(payload + off)) = pattern;
	}

	fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_UDP;
	ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add);
	if (ret) {
		dev_info(&pf->pdev->dev,
			 "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n",
			 fd_data->pctype, fd_data->fd_id, ret);
		/* Free the packet buffer since it wasn't added to the ring */
		kfree(raw_packet);
		return -EOPNOTSUPP;
	} else if (I40E_DEBUG_FD & pf->hw.debug_mask) {
		if (add)
			dev_info(&pf->pdev->dev,
				 "Filter OK for PCTYPE %d loc = %d\n",
				 fd_data->pctype, fd_data->fd_id);
		else
			dev_info(&pf->pdev->dev,
				 "Filter deleted for PCTYPE %d loc = %d\n",
				 fd_data->pctype, fd_data->fd_id);
	}

	if (add)
		pf->fd_udp4_filter_cnt++;
	else
		pf->fd_udp4_filter_cnt--;

	return 0;
}

#define I40E_TCPIP_DUMMY_PACKET_LEN 54
/**
 * i40e_add_del_fdir_tcpv4 - Add/Remove TCPv4 filters
 * @vsi: pointer to the targeted VSI
 * @fd_data: the flow director data required for the FDir descriptor
 * @add: true adds a filter, false removes it
 *
 * Returns 0 if the filters were successfully added or removed
 **/
static int i40e_add_del_fdir_tcpv4(struct i40e_vsi *vsi,
				   struct i40e_fdir_filter *fd_data,
				   bool add)
{
	struct i40e_pf *pf = vsi->back;
	struct tcphdr *tcp;
	struct iphdr *ip;
	u8 *raw_packet;
	int ret;
	/* Dummy packet */
	static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0,
		0x45, 0, 0, 0x28, 0, 0, 0x40, 0, 0x40, 0x6, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x80, 0x11,
		0x0, 0x72, 0, 0, 0, 0};

	raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL);
	if (!raw_packet)
		return -ENOMEM;
	memcpy(raw_packet, packet, I40E_TCPIP_DUMMY_PACKET_LEN);

	ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET);
	tcp = (struct tcphdr *)(raw_packet + IP_HEADER_OFFSET
	      + sizeof(struct iphdr));

	ip->daddr = fd_data->dst_ip;
	tcp->dest = fd_data->dst_port;
	ip->saddr = fd_data->src_ip;
	tcp->source = fd_data->src_port;

	if (fd_data->flex_filter) {
		u8 *payload = raw_packet + I40E_TCPIP_DUMMY_PACKET_LEN;
		__be16 pattern = fd_data->flex_word;
		u16 off = fd_data->flex_offset;

		*((__force __be16 *)(payload + off)) = pattern;
	}

	fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_TCP;
	ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add);
	if (ret) {
		dev_info(&pf->pdev->dev,
			 "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n",
			 fd_data->pctype, fd_data->fd_id, ret);
		/* Free the packet buffer since it wasn't added to the ring */
		kfree(raw_packet);
		return -EOPNOTSUPP;
	} else if (I40E_DEBUG_FD & pf->hw.debug_mask) {
		if (add)
			dev_info(&pf->pdev->dev, "Filter OK for PCTYPE %d loc = %d)\n",
				 fd_data->pctype, fd_data->fd_id);
		else
			dev_info(&pf->pdev->dev,
				 "Filter deleted for PCTYPE %d loc = %d\n",
				 fd_data->pctype, fd_data->fd_id);
	}

	if (add) {
		pf->fd_tcp4_filter_cnt++;
		if ((pf->flags & I40E_FLAG_FD_ATR_ENABLED) &&
		    I40E_DEBUG_FD & pf->hw.debug_mask)
			dev_info(&pf->pdev->dev, "Forcing ATR off, sideband rules for TCP/IPv4 flow being applied\n");
		pf->flags |= I40E_FLAG_FD_ATR_AUTO_DISABLED;
	} else {
		pf->fd_tcp4_filter_cnt--;
	}

	return 0;
}

#define I40E_SCTPIP_DUMMY_PACKET_LEN 46
/**
 * i40e_add_del_fdir_sctpv4 - Add/Remove SCTPv4 Flow Director filters for
 * a specific flow spec
 * @vsi: pointer to the targeted VSI
 * @fd_data: the flow director data required for the FDir descriptor
 * @add: true adds a filter, false removes it
 *
 * Returns 0 if the filters were successfully added or removed
 **/
static int i40e_add_del_fdir_sctpv4(struct i40e_vsi *vsi,
				    struct i40e_fdir_filter *fd_data,
				    bool add)
{
	struct i40e_pf *pf = vsi->back;
	struct sctphdr *sctp;
	struct iphdr *ip;
	u8 *raw_packet;
	int ret;
	/* Dummy packet */
	static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0,
		0x45, 0, 0, 0x20, 0, 0, 0x40, 0, 0x40, 0x84, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

	raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL);
	if (!raw_packet)
		return -ENOMEM;
	memcpy(raw_packet, packet, I40E_SCTPIP_DUMMY_PACKET_LEN);

	ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET);
	sctp = (struct sctphdr *)(raw_packet + IP_HEADER_OFFSET
	      + sizeof(struct iphdr));

	ip->daddr = fd_data->dst_ip;
	sctp->dest = fd_data->dst_port;
	ip->saddr = fd_data->src_ip;
	sctp->source = fd_data->src_port;

	if (fd_data->flex_filter) {
		u8 *payload = raw_packet + I40E_SCTPIP_DUMMY_PACKET_LEN;
		__be16 pattern = fd_data->flex_word;
		u16 off = fd_data->flex_offset;

		*((__force __be16 *)(payload + off)) = pattern;
	}

	fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_SCTP;
	ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add);
	if (ret) {
		dev_info(&pf->pdev->dev,
			 "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n",
			 fd_data->pctype, fd_data->fd_id, ret);
		/* Free the packet buffer since it wasn't added to the ring */
		kfree(raw_packet);
		return -EOPNOTSUPP;
	} else if (I40E_DEBUG_FD & pf->hw.debug_mask) {
		if (add)
			dev_info(&pf->pdev->dev,
				 "Filter OK for PCTYPE %d loc = %d\n",
				 fd_data->pctype, fd_data->fd_id);
		else
			dev_info(&pf->pdev->dev,
				 "Filter deleted for PCTYPE %d loc = %d\n",
				 fd_data->pctype, fd_data->fd_id);
	}

	if (add)
		pf->fd_sctp4_filter_cnt++;
	else
		pf->fd_sctp4_filter_cnt--;

	return 0;
}

#define I40E_IP_DUMMY_PACKET_LEN 34
/**
 * i40e_add_del_fdir_ipv4 - Add/Remove IPv4 Flow Director filters for
 * a specific flow spec
 * @vsi: pointer to the targeted VSI
 * @fd_data: the flow director data required for the FDir descriptor
 * @add: true adds a filter, false removes it
 *
 * Returns 0 if the filters were successfully added or removed
 **/
static int i40e_add_del_fdir_ipv4(struct i40e_vsi *vsi,
				  struct i40e_fdir_filter *fd_data,
				  bool add)
{
	struct i40e_pf *pf = vsi->back;
	struct iphdr *ip;
	u8 *raw_packet;
	int ret;
	int i;
	static char packet[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0,
		0x45, 0, 0, 0x14, 0, 0, 0x40, 0, 0x40, 0x10, 0, 0, 0, 0, 0, 0,
		0, 0, 0, 0};

	for (i = I40E_FILTER_PCTYPE_NONF_IPV4_OTHER;
	     i <= I40E_FILTER_PCTYPE_FRAG_IPV4;	i++) {
		raw_packet = kzalloc(I40E_FDIR_MAX_RAW_PACKET_SIZE, GFP_KERNEL);
		if (!raw_packet)
			return -ENOMEM;
		memcpy(raw_packet, packet, I40E_IP_DUMMY_PACKET_LEN);
		ip = (struct iphdr *)(raw_packet + IP_HEADER_OFFSET);

		ip->saddr = fd_data->src_ip;
		ip->daddr = fd_data->dst_ip;
		ip->protocol = 0;

		if (fd_data->flex_filter) {
			u8 *payload = raw_packet + I40E_IP_DUMMY_PACKET_LEN;
			__be16 pattern = fd_data->flex_word;
			u16 off = fd_data->flex_offset;

			*((__force __be16 *)(payload + off)) = pattern;
		}

		fd_data->pctype = i;
		ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add);
		if (ret) {
			dev_info(&pf->pdev->dev,
				 "PCTYPE:%d, Filter command send failed for fd_id:%d (ret = %d)\n",
				 fd_data->pctype, fd_data->fd_id, ret);
			/* The packet buffer wasn't added to the ring so we
			 * need to free it now.
			 */
			kfree(raw_packet);
			return -EOPNOTSUPP;
		} else if (I40E_DEBUG_FD & pf->hw.debug_mask) {
			if (add)
				dev_info(&pf->pdev->dev,
					 "Filter OK for PCTYPE %d loc = %d\n",
					 fd_data->pctype, fd_data->fd_id);
			else
				dev_info(&pf->pdev->dev,
					 "Filter deleted for PCTYPE %d loc = %d\n",
					 fd_data->pctype, fd_data->fd_id);
		}
	}

	if (add)
		pf->fd_ip4_filter_cnt++;
	else
		pf->fd_ip4_filter_cnt--;

	return 0;
}

/**
 * i40e_add_del_fdir - Build raw packets to add/del fdir filter
 * @vsi: pointer to the targeted VSI
 * @cmd: command to get or set RX flow classification rules
 * @add: true adds a filter, false removes it
 *
 **/
int i40e_add_del_fdir(struct i40e_vsi *vsi,
		      struct i40e_fdir_filter *input, bool add)
{
	struct i40e_pf *pf = vsi->back;
	int ret;

	switch (input->flow_type & ~FLOW_EXT) {
	case TCP_V4_FLOW:
		ret = i40e_add_del_fdir_tcpv4(vsi, input, add);
		break;
	case UDP_V4_FLOW:
		ret = i40e_add_del_fdir_udpv4(vsi, input, add);
		break;
	case SCTP_V4_FLOW:
		ret = i40e_add_del_fdir_sctpv4(vsi, input, add);
		break;
	case IP_USER_FLOW:
		switch (input->ip4_proto) {
		case IPPROTO_TCP:
			ret = i40e_add_del_fdir_tcpv4(vsi, input, add);
			break;
		case IPPROTO_UDP:
			ret = i40e_add_del_fdir_udpv4(vsi, input, add);
			break;
		case IPPROTO_SCTP:
			ret = i40e_add_del_fdir_sctpv4(vsi, input, add);
			break;
		case IPPROTO_IP:
			ret = i40e_add_del_fdir_ipv4(vsi, input, add);
			break;
		default:
			/* We cannot support masking based on protocol */
			dev_info(&pf->pdev->dev, "Unsupported IPv4 protocol 0x%02x\n",
				 input->ip4_proto);
			return -EINVAL;
		}
		break;
	default:
		dev_info(&pf->pdev->dev, "Unsupported flow type 0x%02x\n",
			 input->flow_type);
		return -EINVAL;
	}

	/* The buffer allocated here will be normally be freed by
	 * i40e_clean_fdir_tx_irq() as it reclaims resources after transmit
	 * completion. In the event of an error adding the buffer to the FDIR
	 * ring, it will immediately be freed. It may also be freed by
	 * i40e_clean_tx_ring() when closing the VSI.
	 */
	return ret;
}

/**
 * i40e_fd_handle_status - check the Programming Status for FD
 * @rx_ring: the Rx ring for this descriptor
 * @rx_desc: the Rx descriptor for programming Status, not a packet descriptor.
 * @prog_id: the id originally used for programming
 *
 * This is used to verify if the FD programming or invalidation
 * requested by SW to the HW is successful or not and take actions accordingly.
 **/
static void i40e_fd_handle_status(struct i40e_ring *rx_ring,
				  union i40e_rx_desc *rx_desc, u8 prog_id)
{
	struct i40e_pf *pf = rx_ring->vsi->back;
	struct pci_dev *pdev = pf->pdev;
	u32 fcnt_prog, fcnt_avail;
	u32 error;
	u64 qw;

	qw = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
	error = (qw & I40E_RX_PROG_STATUS_DESC_QW1_ERROR_MASK) >>
		I40E_RX_PROG_STATUS_DESC_QW1_ERROR_SHIFT;

	if (error == BIT(I40E_RX_PROG_STATUS_DESC_FD_TBL_FULL_SHIFT)) {
		pf->fd_inv = le32_to_cpu(rx_desc->wb.qword0.hi_dword.fd_id);
		if ((rx_desc->wb.qword0.hi_dword.fd_id != 0) ||
		    (I40E_DEBUG_FD & pf->hw.debug_mask))
			dev_warn(&pdev->dev, "ntuple filter loc = %d, could not be added\n",
				 pf->fd_inv);

		/* Check if the programming error is for ATR.
		 * If so, auto disable ATR and set a state for
		 * flush in progress. Next time we come here if flush is in
		 * progress do nothing, once flush is complete the state will
		 * be cleared.
		 */
		if (test_bit(__I40E_FD_FLUSH_REQUESTED, pf->state))
			return;

		pf->fd_add_err++;
		/* store the current atr filter count */
		pf->fd_atr_cnt = i40e_get_current_atr_cnt(pf);

		if ((rx_desc->wb.qword0.hi_dword.fd_id == 0) &&
		    pf->flags & I40E_FLAG_FD_SB_AUTO_DISABLED) {
			pf->flags |= I40E_FLAG_FD_ATR_AUTO_DISABLED;
			set_bit(__I40E_FD_FLUSH_REQUESTED, pf->state);
		}

		/* filter programming failed most likely due to table full */
		fcnt_prog = i40e_get_global_fd_count(pf);
		fcnt_avail = pf->fdir_pf_filter_count;
		/* If ATR is running fcnt_prog can quickly change,
		 * if we are very close to full, it makes sense to disable
		 * FD ATR/SB and then re-enable it when there is room.
		 */
		if (fcnt_prog >= (fcnt_avail - I40E_FDIR_BUFFER_FULL_MARGIN)) {
			if ((pf->flags & I40E_FLAG_FD_SB_ENABLED) &&
			    !(pf->flags & I40E_FLAG_FD_SB_AUTO_DISABLED)) {
				pf->flags |= I40E_FLAG_FD_SB_AUTO_DISABLED;
				if (I40E_DEBUG_FD & pf->hw.debug_mask)
					dev_warn(&pdev->dev, "FD filter space full, new ntuple rules will not be added\n");
			}
		}
	} else if (error == BIT(I40E_RX_PROG_STATUS_DESC_NO_FD_ENTRY_SHIFT)) {
		if (I40E_DEBUG_FD & pf->hw.debug_mask)
			dev_info(&pdev->dev, "ntuple filter fd_id = %d, could not be removed\n",
				 rx_desc->wb.qword0.hi_dword.fd_id);
	}
}

/**
 * i40e_unmap_and_free_tx_resource - Release a Tx buffer
 * @ring:      the ring that owns the buffer
 * @tx_buffer: the buffer to free
 **/
static void i40e_unmap_and_free_tx_resource(struct i40e_ring *ring,
					    struct i40e_tx_buffer *tx_buffer)
{
	if (tx_buffer->skb) {
		if (tx_buffer->tx_flags & I40E_TX_FLAGS_FD_SB)
			kfree(tx_buffer->raw_buf);
		else if (ring_is_xdp(ring))
			page_frag_free(tx_buffer->raw_buf);
		else
			dev_kfree_skb_any(tx_buffer->skb);
		if (dma_unmap_len(tx_buffer, len))
			dma_unmap_single(ring->dev,
					 dma_unmap_addr(tx_buffer, dma),
					 dma_unmap_len(tx_buffer, len),
					 DMA_TO_DEVICE);
	} else if (dma_unmap_len(tx_buffer, len)) {
		dma_unmap_page(ring->dev,
			       dma_unmap_addr(tx_buffer, dma),
			       dma_unmap_len(tx_buffer, len),
			       DMA_TO_DEVICE);
	}

	tx_buffer->next_to_watch = NULL;
	tx_buffer->skb = NULL;
	dma_unmap_len_set(tx_buffer, len, 0);
	/* tx_buffer must be completely set up in the transmit path */
}

/**
 * i40e_clean_tx_ring - Free any empty Tx buffers
 * @tx_ring: ring to be cleaned
 **/
void i40e_clean_tx_ring(struct i40e_ring *tx_ring)
{
	unsigned long bi_size;
	u16 i;

	/* ring already cleared, nothing to do */
	if (!tx_ring->tx_bi)
		return;

	/* Free all the Tx ring sk_buffs */
	for (i = 0; i < tx_ring->count; i++)
		i40e_unmap_and_free_tx_resource(tx_ring, &tx_ring->tx_bi[i]);

	bi_size = sizeof(struct i40e_tx_buffer) * tx_ring->count;
	memset(tx_ring->tx_bi, 0, bi_size);

	/* Zero out the descriptor ring */
	memset(tx_ring->desc, 0, tx_ring->size);

	tx_ring->next_to_use = 0;
	tx_ring->next_to_clean = 0;

	if (!tx_ring->netdev)
		return;

	/* cleanup Tx queue statistics */
	netdev_tx_reset_queue(txring_txq(tx_ring));
}

/**
 * i40e_free_tx_resources - Free Tx resources per queue
 * @tx_ring: Tx descriptor ring for a specific queue
 *
 * Free all transmit software resources
 **/
void i40e_free_tx_resources(struct i40e_ring *tx_ring)
{
	i40e_clean_tx_ring(tx_ring);
	kfree(tx_ring->tx_bi);
	tx_ring->tx_bi = NULL;

	if (tx_ring->desc) {
		dma_free_coherent(tx_ring->dev, tx_ring->size,
				  tx_ring->desc, tx_ring->dma);
		tx_ring->desc = NULL;
	}
}

/**
 * i40e_get_tx_pending - how many tx descriptors not processed
 * @tx_ring: the ring of descriptors
 *
 * Since there is no access to the ring head register
 * in XL710, we need to use our local copies
 **/
u32 i40e_get_tx_pending(struct i40e_ring *ring)
{
	u32 head, tail;

	head = i40e_get_head(ring);
	tail = readl(ring->tail);

	if (head != tail)
		return (head < tail) ?
			tail - head : (tail + ring->count - head);

	return 0;
}

#define WB_STRIDE 4

/**
 * i40e_clean_tx_irq - Reclaim resources after transmit completes
 * @vsi: the VSI we care about
 * @tx_ring: Tx ring to clean
 * @napi_budget: Used to determine if we are in netpoll
 *
 * Returns true if there's any budget left (e.g. the clean is finished)
 **/
static bool i40e_clean_tx_irq(struct i40e_vsi *vsi,
			      struct i40e_ring *tx_ring, int napi_budget)
{
	u16 i = tx_ring->next_to_clean;
	struct i40e_tx_buffer *tx_buf;
	struct i40e_tx_desc *tx_head;
	struct i40e_tx_desc *tx_desc;
	unsigned int total_bytes = 0, total_packets = 0;
	unsigned int budget = vsi->work_limit;

	tx_buf = &tx_ring->tx_bi[i];
	tx_desc = I40E_TX_DESC(tx_ring, i);
	i -= tx_ring->count;

	tx_head = I40E_TX_DESC(tx_ring, i40e_get_head(tx_ring));

	do {
		struct i40e_tx_desc *eop_desc = tx_buf->next_to_watch;

		/* if next_to_watch is not set then there is no work pending */
		if (!eop_desc)
			break;

		/* prevent any other reads prior to eop_desc */
		read_barrier_depends();

		i40e_trace(clean_tx_irq, tx_ring, tx_desc, tx_buf);
		/* we have caught up to head, no work left to do */
		if (tx_head == tx_desc)
			break;

		/* clear next_to_watch to prevent false hangs */
		tx_buf->next_to_watch = NULL;

		/* update the statistics for this packet */
		total_bytes += tx_buf->bytecount;
		total_packets += tx_buf->gso_segs;

		/* free the skb/XDP data */
		if (ring_is_xdp(tx_ring))
			page_frag_free(tx_buf->raw_buf);
		else
			napi_consume_skb(tx_buf->skb, napi_budget);

		/* unmap skb header data */
		dma_unmap_single(tx_ring->dev,
				 dma_unmap_addr(tx_buf, dma),
				 dma_unmap_len(tx_buf, len),
				 DMA_TO_DEVICE);

		/* clear tx_buffer data */
		tx_buf->skb = NULL;
		dma_unmap_len_set(tx_buf, len, 0);

		/* unmap remaining buffers */
		while (tx_desc != eop_desc) {
			i40e_trace(clean_tx_irq_unmap,
				   tx_ring, tx_desc, tx_buf);

			tx_buf++;
			tx_desc++;
			i++;
			if (unlikely(!i)) {
				i -= tx_ring->count;
				tx_buf = tx_ring->tx_bi;
				tx_desc = I40E_TX_DESC(tx_ring, 0);
			}

			/* unmap any remaining paged data */
			if (dma_unmap_len(tx_buf, len)) {
				dma_unmap_page(tx_ring->dev,
					       dma_unmap_addr(tx_buf, dma),
					       dma_unmap_len(tx_buf, len),
					       DMA_TO_DEVICE);
				dma_unmap_len_set(tx_buf, len, 0);
			}
		}

		/* move us one more past the eop_desc for start of next pkt */
		tx_buf++;
		tx_desc++;
		i++;
		if (unlikely(!i)) {
			i -= tx_ring->count;
			tx_buf = tx_ring->tx_bi;
			tx_desc = I40E_TX_DESC(tx_ring, 0);
		}

		prefetch(tx_desc);

		/* update budget accounting */
		budget--;
	} while (likely(budget));

	i += tx_ring->count;
	tx_ring->next_to_clean = i;
	u64_stats_update_begin(&tx_ring->syncp);
	tx_ring->stats.bytes += total_bytes;
	tx_ring->stats.packets += total_packets;
	u64_stats_update_end(&tx_ring->syncp);
	tx_ring->q_vector->tx.total_bytes += total_bytes;
	tx_ring->q_vector->tx.total_packets += total_packets;

	if (tx_ring->flags & I40E_TXR_FLAGS_WB_ON_ITR) {
		/* check to see if there are < 4 descriptors
		 * waiting to be written back, then kick the hardware to force
		 * them to be written back in case we stay in NAPI.
		 * In this mode on X722 we do not enable Interrupt.
		 */
		unsigned int j = i40e_get_tx_pending(tx_ring);

		if (budget &&
		    ((j / WB_STRIDE) == 0) && (j > 0) &&
		    !test_bit(__I40E_VSI_DOWN, vsi->state) &&
		    (I40E_DESC_UNUSED(tx_ring) != tx_ring->count))
			tx_ring->arm_wb = true;
	}

	if (ring_is_xdp(tx_ring))
		return !!budget;

	/* notify netdev of completed buffers */
	netdev_tx_completed_queue(txring_txq(tx_ring),
				  total_packets, total_bytes);

#define TX_WAKE_THRESHOLD ((s16)(DESC_NEEDED * 2))
	if (unlikely(total_packets && netif_carrier_ok(tx_ring->netdev) &&
		     (I40E_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD))) {
		/* Make sure that anybody stopping the queue after this
		 * sees the new next_to_clean.
		 */
		smp_mb();
		if (__netif_subqueue_stopped(tx_ring->netdev,
					     tx_ring->queue_index) &&
		   !test_bit(__I40E_VSI_DOWN, vsi->state)) {
			netif_wake_subqueue(tx_ring->netdev,
					    tx_ring->queue_index);
			++tx_ring->tx_stats.restart_queue;
		}
	}

	return !!budget;
}

/**
 * i40e_enable_wb_on_itr - Arm hardware to do a wb, interrupts are not enabled
 * @vsi: the VSI we care about
 * @q_vector: the vector on which to enable writeback
 *
 **/
static void i40e_enable_wb_on_itr(struct i40e_vsi *vsi,
				  struct i40e_q_vector *q_vector)
{
	u16 flags = q_vector->tx.ring[0].flags;
	u32 val;

	if (!(flags & I40E_TXR_FLAGS_WB_ON_ITR))
		return;

	if (q_vector->arm_wb_state)
		return;

	if (vsi->back->flags & I40E_FLAG_MSIX_ENABLED) {
		val = I40E_PFINT_DYN_CTLN_WB_ON_ITR_MASK |
		      I40E_PFINT_DYN_CTLN_ITR_INDX_MASK; /* set noitr */

		wr32(&vsi->back->hw,
		     I40E_PFINT_DYN_CTLN(q_vector->v_idx + vsi->base_vector - 1),
		     val);
	} else {
		val = I40E_PFINT_DYN_CTL0_WB_ON_ITR_MASK |
		      I40E_PFINT_DYN_CTL0_ITR_INDX_MASK; /* set noitr */

		wr32(&vsi->back->hw, I40E_PFINT_DYN_CTL0, val);
	}
	q_vector->arm_wb_state = true;
}

/**
 * i40e_force_wb - Issue SW Interrupt so HW does a wb
 * @vsi: the VSI we care about
 * @q_vector: the vector  on which to force writeback
 *
 **/
void i40e_force_wb(struct i40e_vsi *vsi, struct i40e_q_vector *q_vector)
{
	if (vsi->back->flags & I40E_FLAG_MSIX_ENABLED) {
		u32 val = I40E_PFINT_DYN_CTLN_INTENA_MASK |
			  I40E_PFINT_DYN_CTLN_ITR_INDX_MASK | /* set noitr */
			  I40E_PFINT_DYN_CTLN_SWINT_TRIG_MASK |
			  I40E_PFINT_DYN_CTLN_SW_ITR_INDX_ENA_MASK;
			  /* allow 00 to be written to the index */

		wr32(&vsi->back->hw,
		     I40E_PFINT_DYN_CTLN(q_vector->v_idx +
					 vsi->base_vector - 1), val);
	} else {
		u32 val = I40E_PFINT_DYN_CTL0_INTENA_MASK |
			  I40E_PFINT_DYN_CTL0_ITR_INDX_MASK | /* set noitr */
			  I40E_PFINT_DYN_CTL0_SWINT_TRIG_MASK |
			  I40E_PFINT_DYN_CTL0_SW_ITR_INDX_ENA_MASK;
			/* allow 00 to be written to the index */

		wr32(&vsi->back->hw, I40E_PFINT_DYN_CTL0, val);
	}
}

/**
 * i40e_set_new_dynamic_itr - Find new ITR level
 * @rc: structure containing ring performance data
 *
 * Returns true if ITR changed, false if not
 *
 * Stores a new ITR value based on packets and byte counts during
 * the last interrupt.  The advantage of per interrupt computation
 * is faster updates and more accurate ITR for the current traffic
 * pattern.  Constants in this function were computed based on
 * theoretical maximum wire speed and thresholds were set based on
 * testing data as well as attempting to minimize response time
 * while increasing bulk throughput.
 **/
static bool i40e_set_new_dynamic_itr(struct i40e_ring_container *rc)
{
	enum i40e_latency_range new_latency_range = rc->latency_range;
	u32 new_itr = rc->itr;
	int bytes_per_int;
	unsigned int usecs, estimated_usecs;

	if (rc->total_packets == 0 || !rc->itr)
		return false;

	usecs = (rc->itr << 1) * ITR_COUNTDOWN_START;
	bytes_per_int = rc->total_bytes / usecs;

	/* The calculations in this algorithm depend on interrupts actually
	 * firing at the ITR rate. This may not happen if the packet rate is
	 * really low, or if we've been napi polling. Check to make sure
	 * that's not the case before we continue.
	 */
	estimated_usecs = jiffies_to_usecs(jiffies - rc->last_itr_update);
	if (estimated_usecs > usecs) {
		new_latency_range = I40E_LOW_LATENCY;
		goto reset_latency;
	}

	/* simple throttlerate management
	 *   0-10MB/s   lowest (50000 ints/s)
	 *  10-20MB/s   low    (20000 ints/s)
	 *  20-1249MB/s bulk   (18000 ints/s)
	 *
	 * The math works out because the divisor is in 10^(-6) which
	 * turns the bytes/us input value into MB/s values, but
	 * make sure to use usecs, as the register values written
	 * are in 2 usec increments in the ITR registers, and make sure
	 * to use the smoothed values that the countdown timer gives us.
	 */
	switch (new_latency_range) {
	case I40E_LOWEST_LATENCY:
		if (bytes_per_int > 10)
			new_latency_range = I40E_LOW_LATENCY;
		break;
	case I40E_LOW_LATENCY:
		if (bytes_per_int > 20)
			new_latency_range = I40E_BULK_LATENCY;
		else if (bytes_per_int <= 10)
			new_latency_range = I40E_LOWEST_LATENCY;
		break;
	case I40E_BULK_LATENCY:
	default:
		if (bytes_per_int <= 20)
			new_latency_range = I40E_LOW_LATENCY;
		break;
	}

reset_latency:
	rc->latency_range = new_latency_range;

	switch (new_latency_range) {
	case I40E_LOWEST_LATENCY:
		new_itr = I40E_ITR_50K;
		break;
	case I40E_LOW_LATENCY:
		new_itr = I40E_ITR_20K;
		break;
	case I40E_BULK_LATENCY:
		new_itr = I40E_ITR_18K;
		break;
	default:
		break;
	}

	rc->total_bytes = 0;
	rc->total_packets = 0;
	rc->last_itr_update = jiffies;

	if (new_itr != rc->itr) {
		rc->itr = new_itr;
		return true;
	}
	return false;
}

/**
 * i40e_reuse_rx_page - page flip buffer and store it back on the ring
 * @rx_ring: rx descriptor ring to store buffers on
 * @old_buff: donor buffer to have page reused
 *
 * Synchronizes page for reuse by the adapter
 **/
static void i40e_reuse_rx_page(struct i40e_ring *rx_ring,
			       struct i40e_rx_buffer *old_buff)
{
	struct i40e_rx_buffer *new_buff;
	u16 nta = rx_ring->next_to_alloc;

	new_buff = &rx_ring->rx_bi[nta];

	/* update, and store next to alloc */
	nta++;
	rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;

	/* transfer page from old buffer to new buffer */
	new_buff->dma		= old_buff->dma;
	new_buff->page		= old_buff->page;
	new_buff->page_offset	= old_buff->page_offset;
	new_buff->pagecnt_bias	= old_buff->pagecnt_bias;
}

/**
 * i40e_rx_is_programming_status - check for programming status descriptor
 * @qw: qword representing status_error_len in CPU ordering
 *
 * The value of in the descriptor length field indicate if this
 * is a programming status descriptor for flow director or FCoE
 * by the value of I40E_RX_PROG_STATUS_DESC_LENGTH, otherwise
 * it is a packet descriptor.
 **/
static inline bool i40e_rx_is_programming_status(u64 qw)
{
	/* The Rx filter programming status and SPH bit occupy the same
	 * spot in the descriptor. Since we don't support packet split we
	 * can just reuse the bit as an indication that this is a
	 * programming status descriptor.
	 */
	return qw & I40E_RXD_QW1_LENGTH_SPH_MASK;
}

/**
 * i40e_clean_programming_status - clean the programming status descriptor
 * @rx_ring: the rx ring that has this descriptor
 * @rx_desc: the rx descriptor written back by HW
 * @qw: qword representing status_error_len in CPU ordering
 *
 * Flow director should handle FD_FILTER_STATUS to check its filter programming
 * status being successful or not and take actions accordingly. FCoE should
 * handle its context/filter programming/invalidation status and take actions.
 *
 **/
static void i40e_clean_programming_status(struct i40e_ring *rx_ring,
					  union i40e_rx_desc *rx_desc,
					  u64 qw)
{
	struct i40e_rx_buffer *rx_buffer;
	u32 ntc = rx_ring->next_to_clean;
	u8 id;

	/* fetch, update, and store next to clean */
	rx_buffer = &rx_ring->rx_bi[ntc++];
	ntc = (ntc < rx_ring->count) ? ntc : 0;
	rx_ring->next_to_clean = ntc;

	prefetch(I40E_RX_DESC(rx_ring, ntc));

	/* place unused page back on the ring */
	i40e_reuse_rx_page(rx_ring, rx_buffer);
	rx_ring->rx_stats.page_reuse_count++;

	/* clear contents of buffer_info */
	rx_buffer->page = NULL;

	id = (qw & I40E_RX_PROG_STATUS_DESC_QW1_PROGID_MASK) >>
		  I40E_RX_PROG_STATUS_DESC_QW1_PROGID_SHIFT;

	if (id == I40E_RX_PROG_STATUS_DESC_FD_FILTER_STATUS)
		i40e_fd_handle_status(rx_ring, rx_desc, id);
}

/**
 * i40e_setup_tx_descriptors - Allocate the Tx descriptors
 * @tx_ring: the tx ring to set up
 *
 * Return 0 on success, negative on error
 **/
int i40e_setup_tx_descriptors(struct i40e_ring *tx_ring)
{
	struct device *dev = tx_ring->dev;
	int bi_size;

	if (!dev)
		return -ENOMEM;

	/* warn if we are about to overwrite the pointer */
	WARN_ON(tx_ring->tx_bi);
	bi_size = sizeof(struct i40e_tx_buffer) * tx_ring->count;
	tx_ring->tx_bi = kzalloc(bi_size, GFP_KERNEL);
	if (!tx_ring->tx_bi)
		goto err;

	u64_stats_init(&tx_ring->syncp);

	/* round up to nearest 4K */
	tx_ring->size = tx_ring->count * sizeof(struct i40e_tx_desc);
	/* add u32 for head writeback, align after this takes care of
	 * guaranteeing this is at least one cache line in size
	 */
	tx_ring->size += sizeof(u32);
	tx_ring->size = ALIGN(tx_ring->size, 4096);
	tx_ring->desc = dma_alloc_coherent(dev, tx_ring->size,
					   &tx_ring->dma, GFP_KERNEL);
	if (!tx_ring->desc) {
		dev_info(dev, "Unable to allocate memory for the Tx descriptor ring, size=%d\n",
			 tx_ring->size);
		goto err;
	}

	tx_ring->next_to_use = 0;
	tx_ring->next_to_clean = 0;
	return 0;

err:
	kfree(tx_ring->tx_bi);
	tx_ring->tx_bi = NULL;
	return -ENOMEM;
}

/**
 * i40e_clean_rx_ring - Free Rx buffers
 * @rx_ring: ring to be cleaned
 **/
void i40e_clean_rx_ring(struct i40e_ring *rx_ring)
{
	unsigned long bi_size;
	u16 i;

	/* ring already cleared, nothing to do */
	if (!rx_ring->rx_bi)
		return;

	if (rx_ring->skb) {
		dev_kfree_skb(rx_ring->skb);
		rx_ring->skb = NULL;
	}

	/* Free all the Rx ring sk_buffs */
	for (i = 0; i < rx_ring->count; i++) {
		struct i40e_rx_buffer *rx_bi = &rx_ring->rx_bi[i];

		if (!rx_bi->page)
			continue;

		/* Invalidate cache lines that may have been written to by
		 * device so that we avoid corrupting memory.
		 */
		dma_sync_single_range_for_cpu(rx_ring->dev,
					      rx_bi->dma,
					      rx_bi->page_offset,
					      rx_ring->rx_buf_len,
					      DMA_FROM_DEVICE);

		/* free resources associated with mapping */
		dma_unmap_page_attrs(rx_ring->dev, rx_bi->dma,
				     i40e_rx_pg_size(rx_ring),
				     DMA_FROM_DEVICE,
				     I40E_RX_DMA_ATTR);

		__page_frag_cache_drain(rx_bi->page, rx_bi->pagecnt_bias);

		rx_bi->page = NULL;
		rx_bi->page_offset = 0;
	}

	bi_size = sizeof(struct i40e_rx_buffer) * rx_ring->count;
	memset(rx_ring->rx_bi, 0, bi_size);

	/* Zero out the descriptor ring */
	memset(rx_ring->desc, 0, rx_ring->size);

	rx_ring->next_to_alloc = 0;
	rx_ring->next_to_clean = 0;
	rx_ring->next_to_use = 0;
}

/**
 * i40e_free_rx_resources - Free Rx resources
 * @rx_ring: ring to clean the resources from
 *
 * Free all receive software resources
 **/
void i40e_free_rx_resources(struct i40e_ring *rx_ring)
{
	i40e_clean_rx_ring(rx_ring);
	rx_ring->xdp_prog = NULL;
	kfree(rx_ring->rx_bi);
	rx_ring->rx_bi = NULL;

	if (rx_ring->desc) {
		dma_free_coherent(rx_ring->dev, rx_ring->size,
				  rx_ring->desc, rx_ring->dma);
		rx_ring->desc = NULL;
	}
}

/**
 * i40e_setup_rx_descriptors - Allocate Rx descriptors
 * @rx_ring: Rx descriptor ring (for a specific queue) to setup
 *
 * Returns 0 on success, negative on failure
 **/
int i40e_setup_rx_descriptors(struct i40e_ring *rx_ring)
{
	struct device *dev = rx_ring->dev;
	int bi_size;

	/* warn if we are about to overwrite the pointer */
	WARN_ON(rx_ring->rx_bi);
	bi_size = sizeof(struct i40e_rx_buffer) * rx_ring->count;
	rx_ring->rx_bi = kzalloc(bi_size, GFP_KERNEL);
	if (!rx_ring->rx_bi)
		goto err;

	u64_stats_init(&rx_ring->syncp);

	/* Round up to nearest 4K */
	rx_ring->size = rx_ring->count * sizeof(union i40e_32byte_rx_desc);
	rx_ring->size = ALIGN(rx_ring->size, 4096);
	rx_ring->desc = dma_alloc_coherent(dev, rx_ring->size,
					   &rx_ring->dma, GFP_KERNEL);

	if (!rx_ring->desc) {
		dev_info(dev, "Unable to allocate memory for the Rx descriptor ring, size=%d\n",
			 rx_ring->size);
		goto err;
	}

	rx_ring->next_to_alloc = 0;
	rx_ring->next_to_clean = 0;
	rx_ring->next_to_use = 0;

	rx_ring->xdp_prog = rx_ring->vsi->xdp_prog;

	return 0;
err:
	kfree(rx_ring->rx_bi);
	rx_ring->rx_bi = NULL;
	return -ENOMEM;
}

/**
 * i40e_release_rx_desc - Store the new tail and head values
 * @rx_ring: ring to bump
 * @val: new head index
 **/
static inline void i40e_release_rx_desc(struct i40e_ring *rx_ring, u32 val)
{
	rx_ring->next_to_use = val;

	/* update next to alloc since we have filled the ring */
	rx_ring->next_to_alloc = val;

	/* Force memory writes to complete before letting h/w
	 * know there are new descriptors to fetch.  (Only
	 * applicable for weak-ordered memory model archs,
	 * such as IA-64).
	 */
	wmb();
	writel(val, rx_ring->tail);
}

/**
 * i40e_rx_offset - Return expected offset into page to access data
 * @rx_ring: Ring we are requesting offset of
 *
 * Returns the offset value for ring into the data buffer.
 */
static inline unsigned int i40e_rx_offset(struct i40e_ring *rx_ring)
{
	return ring_uses_build_skb(rx_ring) ? I40E_SKB_PAD : 0;
}

/**
 * i40e_alloc_mapped_page - recycle or make a new page
 * @rx_ring: ring to use
 * @bi: rx_buffer struct to modify
 *
 * Returns true if the page was successfully allocated or
 * reused.
 **/
static bool i40e_alloc_mapped_page(struct i40e_ring *rx_ring,
				   struct i40e_rx_buffer *bi)
{
	struct page *page = bi->page;
	dma_addr_t dma;

	/* since we are recycling buffers we should seldom need to alloc */
	if (likely(page)) {
		rx_ring->rx_stats.page_reuse_count++;
		return true;
	}

	/* alloc new page for storage */
	page = dev_alloc_pages(i40e_rx_pg_order(rx_ring));
	if (unlikely(!page)) {
		rx_ring->rx_stats.alloc_page_failed++;
		return false;
	}

	/* map page for use */
	dma = dma_map_page_attrs(rx_ring->dev, page, 0,
				 i40e_rx_pg_size(rx_ring),
				 DMA_FROM_DEVICE,
				 I40E_RX_DMA_ATTR);

	/* if mapping failed free memory back to system since
	 * there isn't much point in holding memory we can't use
	 */
	if (dma_mapping_error(rx_ring->dev, dma)) {
		__free_pages(page, i40e_rx_pg_order(rx_ring));
		rx_ring->rx_stats.alloc_page_failed++;
		return false;
	}

	bi->dma = dma;
	bi->page = page;
	bi->page_offset = i40e_rx_offset(rx_ring);

	/* initialize pagecnt_bias to 1 representing we fully own page */
	bi->pagecnt_bias = 1;

	return true;
}

/**
 * i40e_receive_skb - Send a completed packet up the stack
 * @rx_ring:  rx ring in play
 * @skb: packet to send up
 * @vlan_tag: vlan tag for packet
 **/
static void i40e_receive_skb(struct i40e_ring *rx_ring,
			     struct sk_buff *skb, u16 vlan_tag)
{
	struct i40e_q_vector *q_vector = rx_ring->q_vector;

	if ((rx_ring->netdev->features & NETIF_F_HW_VLAN_CTAG_RX) &&
	    (vlan_tag & VLAN_VID_MASK))
		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag);

	napi_gro_receive(&q_vector->napi, skb);
}

/**
 * i40e_alloc_rx_buffers - Replace used receive buffers
 * @rx_ring: ring to place buffers on
 * @cleaned_count: number of buffers to replace
 *
 * Returns false if all allocations were successful, true if any fail
 **/
bool i40e_alloc_rx_buffers(struct i40e_ring *rx_ring, u16 cleaned_count)
{
	u16 ntu = rx_ring->next_to_use;
	union i40e_rx_desc *rx_desc;
	struct i40e_rx_buffer *bi;

	/* do nothing if no valid netdev defined */
	if (!rx_ring->netdev || !cleaned_count)
		return false;

	rx_desc = I40E_RX_DESC(rx_ring, ntu);
	bi = &rx_ring->rx_bi[ntu];

	do {
		if (!i40e_alloc_mapped_page(rx_ring, bi))
			goto no_buffers;

		/* sync the buffer for use by the device */
		dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
						 bi->page_offset,
						 rx_ring->rx_buf_len,
						 DMA_FROM_DEVICE);

		/* Refresh the desc even if buffer_addrs didn't change
		 * because each write-back erases this info.
		 */
		rx_desc->read.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset);

		rx_desc++;
		bi++;
		ntu++;
		if (unlikely(ntu == rx_ring->count)) {
			rx_desc = I40E_RX_DESC(rx_ring, 0);
			bi = rx_ring->rx_bi;
			ntu = 0;
		}

		/* clear the status bits for the next_to_use descriptor */
		rx_desc->wb.qword1.status_error_len = 0;

		cleaned_count--;
	} while (cleaned_count);

	if (rx_ring->next_to_use != ntu)
		i40e_release_rx_desc(rx_ring, ntu);

	return false;

no_buffers:
	if (rx_ring->next_to_use != ntu)
		i40e_release_rx_desc(rx_ring, ntu);

	/* make sure to come back via polling to try again after
	 * allocation failure
	 */
	return true;
}

/**
 * i40e_rx_checksum - Indicate in skb if hw indicated a good cksum
 * @vsi: the VSI we care about
 * @skb: skb currently being received and modified
 * @rx_desc: the receive descriptor
 **/
static inline void i40e_rx_checksum(struct i40e_vsi *vsi,
				    struct sk_buff *skb,
				    union i40e_rx_desc *rx_desc)
{
	struct i40e_rx_ptype_decoded decoded;
	u32 rx_error, rx_status;
	bool ipv4, ipv6;
	u8 ptype;
	u64 qword;

	qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
	ptype = (qword & I40E_RXD_QW1_PTYPE_MASK) >> I40E_RXD_QW1_PTYPE_SHIFT;
	rx_error = (qword & I40E_RXD_QW1_ERROR_MASK) >>
		   I40E_RXD_QW1_ERROR_SHIFT;
	rx_status = (qword & I40E_RXD_QW1_STATUS_MASK) >>
		    I40E_RXD_QW1_STATUS_SHIFT;
	decoded = decode_rx_desc_ptype(ptype);

	skb->ip_summed = CHECKSUM_NONE;

	skb_checksum_none_assert(skb);

	/* Rx csum enabled and ip headers found? */
	if (!(vsi->netdev->features & NETIF_F_RXCSUM))
		return;

	/* did the hardware decode the packet and checksum? */
	if (!(rx_status & BIT(I40E_RX_DESC_STATUS_L3L4P_SHIFT)))
		return;

	/* both known and outer_ip must be set for the below code to work */
	if (!(decoded.known && decoded.outer_ip))
		return;

	ipv4 = (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP) &&
	       (decoded.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV4);
	ipv6 = (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP) &&
	       (decoded.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV6);

	if (ipv4 &&
	    (rx_error & (BIT(I40E_RX_DESC_ERROR_IPE_SHIFT) |
			 BIT(I40E_RX_DESC_ERROR_EIPE_SHIFT))))
		goto checksum_fail;

	/* likely incorrect csum if alternate IP extension headers found */
	if (ipv6 &&
	    rx_status & BIT(I40E_RX_DESC_STATUS_IPV6EXADD_SHIFT))
		/* don't increment checksum err here, non-fatal err */
		return;

	/* there was some L4 error, count error and punt packet to the stack */
	if (rx_error & BIT(I40E_RX_DESC_ERROR_L4E_SHIFT))
		goto checksum_fail;

	/* handle packets that were not able to be checksummed due
	 * to arrival speed, in this case the stack can compute
	 * the csum.
	 */
	if (rx_error & BIT(I40E_RX_DESC_ERROR_PPRS_SHIFT))
		return;

	/* If there is an outer header present that might contain a checksum
	 * we need to bump the checksum level by 1 to reflect the fact that
	 * we are indicating we validated the inner checksum.
	 */
	if (decoded.tunnel_type >= I40E_RX_PTYPE_TUNNEL_IP_GRENAT)
		skb->csum_level = 1;

	/* Only report checksum unnecessary for TCP, UDP, or SCTP */
	switch (decoded.inner_prot) {
	case I40E_RX_PTYPE_INNER_PROT_TCP:
	case I40E_RX_PTYPE_INNER_PROT_UDP:
	case I40E_RX_PTYPE_INNER_PROT_SCTP:
		skb->ip_summed = CHECKSUM_UNNECESSARY;
		/* fall though */
	default:
		break;
	}

	return;

checksum_fail:
	vsi->back->hw_csum_rx_error++;
}

/**
 * i40e_ptype_to_htype - get a hash type
 * @ptype: the ptype value from the descriptor
 *
 * Returns a hash type to be used by skb_set_hash
 **/
static inline int i40e_ptype_to_htype(u8 ptype)
{
	struct i40e_rx_ptype_decoded decoded = decode_rx_desc_ptype(ptype);

	if (!decoded.known)
		return PKT_HASH_TYPE_NONE;

	if (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP &&
	    decoded.payload_layer == I40E_RX_PTYPE_PAYLOAD_LAYER_PAY4)
		return PKT_HASH_TYPE_L4;
	else if (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP &&
		 decoded.payload_layer == I40E_RX_PTYPE_PAYLOAD_LAYER_PAY3)
		return PKT_HASH_TYPE_L3;
	else
		return PKT_HASH_TYPE_L2;
}

/**
 * i40e_rx_hash - set the hash value in the skb
 * @ring: descriptor ring
 * @rx_desc: specific descriptor
 **/
static inline void i40e_rx_hash(struct i40e_ring *ring,
				union i40e_rx_desc *rx_desc,
				struct sk_buff *skb,
				u8 rx_ptype)
{
	u32 hash;
	const __le64 rss_mask =
		cpu_to_le64((u64)I40E_RX_DESC_FLTSTAT_RSS_HASH <<
			    I40E_RX_DESC_STATUS_FLTSTAT_SHIFT);

	if (!(ring->netdev->features & NETIF_F_RXHASH))
		return;

	if ((rx_desc->wb.qword1.status_error_len & rss_mask) == rss_mask) {
		hash = le32_to_cpu(rx_desc->wb.qword0.hi_dword.rss);
		skb_set_hash(skb, hash, i40e_ptype_to_htype(rx_ptype));
	}
}

/**
 * i40e_process_skb_fields - Populate skb header fields from Rx descriptor
 * @rx_ring: rx descriptor ring packet is being transacted on
 * @rx_desc: pointer to the EOP Rx descriptor
 * @skb: pointer to current skb being populated
 * @rx_ptype: the packet type decoded by hardware
 *
 * This function checks the ring, descriptor, and packet information in
 * order to populate the hash, checksum, VLAN, protocol, and
 * other fields within the skb.
 **/
static inline
void i40e_process_skb_fields(struct i40e_ring *rx_ring,
			     union i40e_rx_desc *rx_desc, struct sk_buff *skb,
			     u8 rx_ptype)
{
	u64 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
	u32 rx_status = (qword & I40E_RXD_QW1_STATUS_MASK) >>
			I40E_RXD_QW1_STATUS_SHIFT;
	u32 tsynvalid = rx_status & I40E_RXD_QW1_STATUS_TSYNVALID_MASK;
	u32 tsyn = (rx_status & I40E_RXD_QW1_STATUS_TSYNINDX_MASK) >>
		   I40E_RXD_QW1_STATUS_TSYNINDX_SHIFT;

	if (unlikely(tsynvalid))
		i40e_ptp_rx_hwtstamp(rx_ring->vsi->back, skb, tsyn);

	i40e_rx_hash(rx_ring, rx_desc, skb, rx_ptype);

	i40e_rx_checksum(rx_ring->vsi, skb, rx_desc);

	skb_record_rx_queue(skb, rx_ring->queue_index);

	/* modifies the skb - consumes the enet header */
	skb->protocol = eth_type_trans(skb, rx_ring->netdev);
}

/**
 * i40e_cleanup_headers - Correct empty headers
 * @rx_ring: rx descriptor ring packet is being transacted on
 * @skb: pointer to current skb being fixed
 * @rx_desc: pointer to the EOP Rx descriptor
 *
 * Also address the case where we are pulling data in on pages only
 * and as such no data is present in the skb header.
 *
 * In addition if skb is not at least 60 bytes we need to pad it so that
 * it is large enough to qualify as a valid Ethernet frame.
 *
 * Returns true if an error was encountered and skb was freed.
 **/
static bool i40e_cleanup_headers(struct i40e_ring *rx_ring, struct sk_buff *skb,
				 union i40e_rx_desc *rx_desc)

{
	/* XDP packets use error pointer so abort at this point */
	if (IS_ERR(skb))
		return true;

	/* ERR_MASK will only have valid bits if EOP set, and
	 * what we are doing here is actually checking
	 * I40E_RX_DESC_ERROR_RXE_SHIFT, since it is the zeroth bit in
	 * the error field
	 */
	if (unlikely(i40e_test_staterr(rx_desc,
				       BIT(I40E_RXD_QW1_ERROR_SHIFT)))) {
		dev_kfree_skb_any(skb);
		return true;
	}

	/* if eth_skb_pad returns an error the skb was freed */
	if (eth_skb_pad(skb))
		return true;

	return false;
}

/**
 * i40e_page_is_reusable - check if any reuse is possible
 * @page: page struct to check
 *
 * A page is not reusable if it was allocated under low memory
 * conditions, or it's not in the same NUMA node as this CPU.
 */
static inline bool i40e_page_is_reusable(struct page *page)
{
	return (page_to_nid(page) == numa_mem_id()) &&
		!page_is_pfmemalloc(page);
}

/**
 * i40e_can_reuse_rx_page - Determine if this page can be reused by
 * the adapter for another receive
 *
 * @rx_buffer: buffer containing the page
 *
 * If page is reusable, rx_buffer->page_offset is adjusted to point to
 * an unused region in the page.
 *
 * For small pages, @truesize will be a constant value, half the size
 * of the memory at page.  We'll attempt to alternate between high and
 * low halves of the page, with one half ready for use by the hardware
 * and the other half being consumed by the stack.  We use the page
 * ref count to determine whether the stack has finished consuming the
 * portion of this page that was passed up with a previous packet.  If
 * the page ref count is >1, we'll assume the "other" half page is
 * still busy, and this page cannot be reused.
 *
 * For larger pages, @truesize will be the actual space used by the
 * received packet (adjusted upward to an even multiple of the cache
 * line size).  This will advance through the page by the amount
 * actually consumed by the received packets while there is still
 * space for a buffer.  Each region of larger pages will be used at
 * most once, after which the page will not be reused.
 *
 * In either case, if the page is reusable its refcount is increased.
 **/
static bool i40e_can_reuse_rx_page(struct i40e_rx_buffer *rx_buffer)
{
	unsigned int pagecnt_bias = rx_buffer->pagecnt_bias;
	struct page *page = rx_buffer->page;

	/* Is any reuse possible? */
	if (unlikely(!i40e_page_is_reusable(page)))
		return false;

#if (PAGE_SIZE < 8192)
	/* if we are only owner of page we can reuse it */
	if (unlikely((page_count(page) - pagecnt_bias) > 1))
		return false;
#else
#define I40E_LAST_OFFSET \
	(SKB_WITH_OVERHEAD(PAGE_SIZE) - I40E_RXBUFFER_2048)
	if (rx_buffer->page_offset > I40E_LAST_OFFSET)
		return false;
#endif

	/* If we have drained the page fragment pool we need to update
	 * the pagecnt_bias and page count so that we fully restock the
	 * number of references the driver holds.
	 */
	if (unlikely(!pagecnt_bias)) {
		page_ref_add(page, USHRT_MAX);
		rx_buffer->pagecnt_bias = USHRT_MAX;
	}

	return true;
}

/**
 * i40e_add_rx_frag - Add contents of Rx buffer to sk_buff
 * @rx_ring: rx descriptor ring to transact packets on
 * @rx_buffer: buffer containing page to add
 * @skb: sk_buff to place the data into
 * @size: packet length from rx_desc
 *
 * This function will add the data contained in rx_buffer->page to the skb.
 * It will just attach the page as a frag to the skb.
 *
 * The function will then update the page offset.
 **/
static void i40e_add_rx_frag(struct i40e_ring *rx_ring,
			     struct i40e_rx_buffer *rx_buffer,
			     struct sk_buff *skb,
			     unsigned int size)
{
#if (PAGE_SIZE < 8192)
	unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2;
#else
	unsigned int truesize = SKB_DATA_ALIGN(size + i40e_rx_offset(rx_ring));
#endif

	skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buffer->page,
			rx_buffer->page_offset, size, truesize);

	/* page is being used so we must update the page offset */
#if (PAGE_SIZE < 8192)
	rx_buffer->page_offset ^= truesize;
#else
	rx_buffer->page_offset += truesize;
#endif
}

/**
 * i40e_get_rx_buffer - Fetch Rx buffer and synchronize data for use
 * @rx_ring: rx descriptor ring to transact packets on
 * @size: size of buffer to add to skb
 *
 * This function will pull an Rx buffer from the ring and synchronize it
 * for use by the CPU.
 */
static struct i40e_rx_buffer *i40e_get_rx_buffer(struct i40e_ring *rx_ring,
						 const unsigned int size)
{
	struct i40e_rx_buffer *rx_buffer;

	rx_buffer = &rx_ring->rx_bi[rx_ring->next_to_clean];
	prefetchw(rx_buffer->page);

	/* we are reusing so sync this buffer for CPU use */
	dma_sync_single_range_for_cpu(rx_ring->dev,
				      rx_buffer->dma,
				      rx_buffer->page_offset,
				      size,
				      DMA_FROM_DEVICE);

	/* We have pulled a buffer for use, so decrement pagecnt_bias */
	rx_buffer->pagecnt_bias--;

	return rx_buffer;
}

/**
 * i40e_construct_skb - Allocate skb and populate it
 * @rx_ring: rx descriptor ring to transact packets on
 * @rx_buffer: rx buffer to pull data from
 * @xdp: xdp_buff pointing to the data
 *
 * This function allocates an skb.  It then populates it with the page
 * data from the current receive descriptor, taking care to set up the
 * skb correctly.
 */
static struct sk_buff *i40e_construct_skb(struct i40e_ring *rx_ring,
					  struct i40e_rx_buffer *rx_buffer,
					  struct xdp_buff *xdp)
{
	unsigned int size = xdp->data_end - xdp->data;
#if (PAGE_SIZE < 8192)
	unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2;
#else
	unsigned int truesize = SKB_DATA_ALIGN(size);
#endif
	unsigned int headlen;
	struct sk_buff *skb;

	/* prefetch first cache line of first page */
	prefetch(xdp->data);
#if L1_CACHE_BYTES < 128
	prefetch(xdp->data + L1_CACHE_BYTES);
#endif

	/* allocate a skb to store the frags */
	skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
			       I40E_RX_HDR_SIZE,
			       GFP_ATOMIC | __GFP_NOWARN);
	if (unlikely(!skb))
		return NULL;

	/* Determine available headroom for copy */
	headlen = size;
	if (headlen > I40E_RX_HDR_SIZE)
		headlen = eth_get_headlen(xdp->data, I40E_RX_HDR_SIZE);

	/* align pull length to size of long to optimize memcpy performance */
	memcpy(__skb_put(skb, headlen), xdp->data,
	       ALIGN(headlen, sizeof(long)));

	/* update all of the pointers */
	size -= headlen;
	if (size) {
		skb_add_rx_frag(skb, 0, rx_buffer->page,
				rx_buffer->page_offset + headlen,
				size, truesize);

		/* buffer is used by skb, update page_offset */
#if (PAGE_SIZE < 8192)
		rx_buffer->page_offset ^= truesize;
#else
		rx_buffer->page_offset += truesize;
#endif
	} else {
		/* buffer is unused, reset bias back to rx_buffer */
		rx_buffer->pagecnt_bias++;
	}

	return skb;
}

/**
 * i40e_build_skb - Build skb around an existing buffer
 * @rx_ring: Rx descriptor ring to transact packets on
 * @rx_buffer: Rx buffer to pull data from
 * @xdp: xdp_buff pointing to the data
 *
 * This function builds an skb around an existing Rx buffer, taking care
 * to set up the skb correctly and avoid any memcpy overhead.
 */
static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring,
				      struct i40e_rx_buffer *rx_buffer,
				      struct xdp_buff *xdp)
{
	unsigned int size = xdp->data_end - xdp->data;
#if (PAGE_SIZE < 8192)
	unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2;
#else
	unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) +
				SKB_DATA_ALIGN(I40E_SKB_PAD + size);
#endif
	struct sk_buff *skb;

	/* prefetch first cache line of first page */
	prefetch(xdp->data);
#if L1_CACHE_BYTES < 128
	prefetch(xdp->data + L1_CACHE_BYTES);
#endif
	/* build an skb around the page buffer */
	skb = build_skb(xdp->data_hard_start, truesize);
	if (unlikely(!skb))
		return NULL;

	/* update pointers within the skb to store the data */
	skb_reserve(skb, I40E_SKB_PAD);
	__skb_put(skb, size);

	/* buffer is used by skb, update page_offset */
#if (PAGE_SIZE < 8192)
	rx_buffer->page_offset ^= truesize;
#else
	rx_buffer->page_offset += truesize;
#endif

	return skb;
}

/**
 * i40e_put_rx_buffer - Clean up used buffer and either recycle or free
 * @rx_ring: rx descriptor ring to transact packets on
 * @rx_buffer: rx buffer to pull data from
 *
 * This function will clean up the contents of the rx_buffer.  It will
 * either recycle the bufer or unmap it and free the associated resources.
 */
static void i40e_put_rx_buffer(struct i40e_ring *rx_ring,
			       struct i40e_rx_buffer *rx_buffer)
{
	if (i40e_can_reuse_rx_page(rx_buffer)) {
		/* hand second half of page back to the ring */
		i40e_reuse_rx_page(rx_ring, rx_buffer);
		rx_ring->rx_stats.page_reuse_count++;
	} else {
		/* we are not reusing the buffer so unmap it */
		dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma,
				     i40e_rx_pg_size(rx_ring),
				     DMA_FROM_DEVICE, I40E_RX_DMA_ATTR);
		__page_frag_cache_drain(rx_buffer->page,
					rx_buffer->pagecnt_bias);
	}

	/* clear contents of buffer_info */
	rx_buffer->page = NULL;
}

/**
 * i40e_is_non_eop - process handling of non-EOP buffers
 * @rx_ring: Rx ring being processed
 * @rx_desc: Rx descriptor for current buffer
 * @skb: Current socket buffer containing buffer in progress
 *
 * This function updates next to clean.  If the buffer is an EOP buffer
 * this function exits returning false, otherwise it will place the
 * sk_buff in the next buffer to be chained and return true indicating
 * that this is in fact a non-EOP buffer.
 **/
static bool i40e_is_non_eop(struct i40e_ring *rx_ring,
			    union i40e_rx_desc *rx_desc,
			    struct sk_buff *skb)
{
	u32 ntc = rx_ring->next_to_clean + 1;

	/* fetch, update, and store next to clean */
	ntc = (ntc < rx_ring->count) ? ntc : 0;
	rx_ring->next_to_clean = ntc;

	prefetch(I40E_RX_DESC(rx_ring, ntc));

	/* if we are the last buffer then there is nothing else to do */
#define I40E_RXD_EOF BIT(I40E_RX_DESC_STATUS_EOF_SHIFT)
	if (likely(i40e_test_staterr(rx_desc, I40E_RXD_EOF)))
		return false;

	rx_ring->rx_stats.non_eop_descs++;

	return true;
}

#define I40E_XDP_PASS 0
#define I40E_XDP_CONSUMED 1
#define I40E_XDP_TX 2

static int i40e_xmit_xdp_ring(struct xdp_buff *xdp,
			      struct i40e_ring *xdp_ring);

/**
 * i40e_run_xdp - run an XDP program
 * @rx_ring: Rx ring being processed
 * @xdp: XDP buffer containing the frame
 **/
static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring,
				    struct xdp_buff *xdp)
{
	int result = I40E_XDP_PASS;
	struct i40e_ring *xdp_ring;
	struct bpf_prog *xdp_prog;
	u32 act;

	rcu_read_lock();
	xdp_prog = READ_ONCE(rx_ring->xdp_prog);

	if (!xdp_prog)
		goto xdp_out;

	act = bpf_prog_run_xdp(xdp_prog, xdp);
	switch (act) {
	case XDP_PASS:
		break;
	case XDP_TX:
		xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index];
		result = i40e_xmit_xdp_ring(xdp, xdp_ring);
		break;
	default:
		bpf_warn_invalid_xdp_action(act);
	case XDP_ABORTED:
		trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
		/* fallthrough -- handle aborts by dropping packet */
	case XDP_DROP:
		result = I40E_XDP_CONSUMED;
		break;
	}
xdp_out:
	rcu_read_unlock();
	return ERR_PTR(-result);
}

/**
 * i40e_rx_buffer_flip - adjusted rx_buffer to point to an unused region
 * @rx_ring: Rx ring
 * @rx_buffer: Rx buffer to adjust
 * @size: Size of adjustment
 **/
static void i40e_rx_buffer_flip(struct i40e_ring *rx_ring,
				struct i40e_rx_buffer *rx_buffer,
				unsigned int size)
{
#if (PAGE_SIZE < 8192)
	unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2;

	rx_buffer->page_offset ^= truesize;
#else
	unsigned int truesize = SKB_DATA_ALIGN(i40e_rx_offset(rx_ring) + size);

	rx_buffer->page_offset += truesize;
#endif
}

/**
 * i40e_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf
 * @rx_ring: rx descriptor ring to transact packets on
 * @budget: Total limit on number of packets to process
 *
 * This function provides a "bounce buffer" approach to Rx interrupt
 * processing.  The advantage to this is that on systems that have
 * expensive overhead for IOMMU access this provides a means of avoiding
 * it by maintaining the mapping of the page to the system.
 *
 * Returns amount of work completed
 **/
static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget)
{
	unsigned int total_rx_bytes = 0, total_rx_packets = 0;
	struct sk_buff *skb = rx_ring->skb;
	u16 cleaned_count = I40E_DESC_UNUSED(rx_ring);
	bool failure = false, xdp_xmit = false;

	while (likely(total_rx_packets < (unsigned int)budget)) {
		struct i40e_rx_buffer *rx_buffer;
		union i40e_rx_desc *rx_desc;
		struct xdp_buff xdp;
		unsigned int size;
		u16 vlan_tag;
		u8 rx_ptype;
		u64 qword;

		/* return some buffers to hardware, one at a time is too slow */
		if (cleaned_count >= I40E_RX_BUFFER_WRITE) {
			failure = failure ||
				  i40e_alloc_rx_buffers(rx_ring, cleaned_count);
			cleaned_count = 0;
		}

		rx_desc = I40E_RX_DESC(rx_ring, rx_ring->next_to_clean);

		/* status_error_len will always be zero for unused descriptors
		 * because it's cleared in cleanup, and overlaps with hdr_addr
		 * which is always zero because packet split isn't used, if the
		 * hardware wrote DD then the length will be non-zero
		 */
		qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);

		/* This memory barrier is needed to keep us from reading
		 * any other fields out of the rx_desc until we have
		 * verified the descriptor has been written back.
		 */
		dma_rmb();

		if (unlikely(i40e_rx_is_programming_status(qword))) {
			i40e_clean_programming_status(rx_ring, rx_desc, qword);
			cleaned_count++;
			continue;
		}
		size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
		       I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
		if (!size)
			break;

		i40e_trace(clean_rx_irq, rx_ring, rx_desc, skb);
		rx_buffer = i40e_get_rx_buffer(rx_ring, size);

		/* retrieve a buffer from the ring */
		if (!skb) {
			xdp.data = page_address(rx_buffer->page) +
				   rx_buffer->page_offset;
			xdp.data_hard_start = xdp.data -
					      i40e_rx_offset(rx_ring);
			xdp.data_end = xdp.data + size;

			skb = i40e_run_xdp(rx_ring, &xdp);
		}

		if (IS_ERR(skb)) {
			if (PTR_ERR(skb) == -I40E_XDP_TX) {
				xdp_xmit = true;
				i40e_rx_buffer_flip(rx_ring, rx_buffer, size);
			} else {
				rx_buffer->pagecnt_bias++;
			}
			total_rx_bytes += size;
			total_rx_packets++;
		} else if (skb) {
			i40e_add_rx_frag(rx_ring, rx_buffer, skb, size);
		} else if (ring_uses_build_skb(rx_ring)) {
			skb = i40e_build_skb(rx_ring, rx_buffer, &xdp);
		} else {
			skb = i40e_construct_skb(rx_ring, rx_buffer, &xdp);
		}

		/* exit if we failed to retrieve a buffer */
		if (!skb) {
			rx_ring->rx_stats.alloc_buff_failed++;
			rx_buffer->pagecnt_bias++;
			break;
		}

		i40e_put_rx_buffer(rx_ring, rx_buffer);
		cleaned_count++;

		if (i40e_is_non_eop(rx_ring, rx_desc, skb))
			continue;

		if (i40e_cleanup_headers(rx_ring, skb, rx_desc)) {
			skb = NULL;
			continue;
		}

		/* probably a little skewed due to removing CRC */
		total_rx_bytes += skb->len;

		qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
		rx_ptype = (qword & I40E_RXD_QW1_PTYPE_MASK) >>
			   I40E_RXD_QW1_PTYPE_SHIFT;

		/* populate checksum, VLAN, and protocol */
		i40e_process_skb_fields(rx_ring, rx_desc, skb, rx_ptype);

		vlan_tag = (qword & BIT(I40E_RX_DESC_STATUS_L2TAG1P_SHIFT)) ?
			   le16_to_cpu(rx_desc->wb.qword0.lo_dword.l2tag1) : 0;

		i40e_trace(clean_rx_irq_rx, rx_ring, rx_desc, skb);
		i40e_receive_skb(rx_ring, skb, vlan_tag);
		skb = NULL;

		/* update budget accounting */
		total_rx_packets++;
	}

	if (xdp_xmit) {
		struct i40e_ring *xdp_ring;

		xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index];

		/* Force memory writes to complete before letting h/w
		 * know there are new descriptors to fetch.
		 */
		wmb();

		writel(xdp_ring->next_to_use, xdp_ring->tail);
	}

	rx_ring->skb = skb;

	u64_stats_update_begin(&rx_ring->syncp);
	rx_ring->stats.packets += total_rx_packets;
	rx_ring->stats.bytes += total_rx_bytes;
	u64_stats_update_end(&rx_ring->syncp);
	rx_ring->q_vector->rx.total_packets += total_rx_packets;
	rx_ring->q_vector->rx.total_bytes += total_rx_bytes;

	/* guarantee a trip back through this routine if there was a failure */
	return failure ? budget : (int)total_rx_packets;
}

static u32 i40e_buildreg_itr(const int type, const u16 itr)
{
	u32 val;

	val = I40E_PFINT_DYN_CTLN_INTENA_MASK |
	      /* Don't clear PBA because that can cause lost interrupts that
	       * came in while we were cleaning/polling
	       */
	      (type << I40E_PFINT_DYN_CTLN_ITR_INDX_SHIFT) |
	      (itr << I40E_PFINT_DYN_CTLN_INTERVAL_SHIFT);

	return val;
}

/* a small macro to shorten up some long lines */
#define INTREG I40E_PFINT_DYN_CTLN
static inline int get_rx_itr(struct i40e_vsi *vsi, int idx)
{
	return vsi->rx_rings[idx]->rx_itr_setting;
}

static inline int get_tx_itr(struct i40e_vsi *vsi, int idx)
{
	return vsi->tx_rings[idx]->tx_itr_setting;
}

/**
 * i40e_update_enable_itr - Update itr and re-enable MSIX interrupt
 * @vsi: the VSI we care about
 * @q_vector: q_vector for which itr is being updated and interrupt enabled
 *
 **/
static inline void i40e_update_enable_itr(struct i40e_vsi *vsi,
					  struct i40e_q_vector *q_vector)
{
	struct i40e_hw *hw = &vsi->back->hw;
	bool rx = false, tx = false;
	u32 rxval, txval;
	int vector;
	int idx = q_vector->v_idx;
	int rx_itr_setting, tx_itr_setting;

	/* If we don't have MSIX, then we only need to re-enable icr0 */
	if (!(vsi->back->flags & I40E_FLAG_MSIX_ENABLED)) {
		i40e_irq_dynamic_enable_icr0(vsi->back, false);
		return;
	}

	vector = (q_vector->v_idx + vsi->base_vector);

	/* avoid dynamic calculation if in countdown mode OR if
	 * all dynamic is disabled
	 */
	rxval = txval = i40e_buildreg_itr(I40E_ITR_NONE, 0);

	rx_itr_setting = get_rx_itr(vsi, idx);
	tx_itr_setting = get_tx_itr(vsi, idx);

	if (q_vector->itr_countdown > 0 ||
	    (!ITR_IS_DYNAMIC(rx_itr_setting) &&
	     !ITR_IS_DYNAMIC(tx_itr_setting))) {
		goto enable_int;
	}

	if (ITR_IS_DYNAMIC(rx_itr_setting)) {
		rx = i40e_set_new_dynamic_itr(&q_vector->rx);
		rxval = i40e_buildreg_itr(I40E_RX_ITR, q_vector->rx.itr);
	}

	if (ITR_IS_DYNAMIC(tx_itr_setting)) {
		tx = i40e_set_new_dynamic_itr(&q_vector->tx);
		txval = i40e_buildreg_itr(I40E_TX_ITR, q_vector->tx.itr);
	}

	if (rx || tx) {
		/* get the higher of the two ITR adjustments and
		 * use the same value for both ITR registers
		 * when in adaptive mode (Rx and/or Tx)
		 */
		u16 itr = max(q_vector->tx.itr, q_vector->rx.itr);

		q_vector->tx.itr = q_vector->rx.itr = itr;
		txval = i40e_buildreg_itr(I40E_TX_ITR, itr);
		tx = true;
		rxval = i40e_buildreg_itr(I40E_RX_ITR, itr);
		rx = true;
	}

	/* only need to enable the interrupt once, but need
	 * to possibly update both ITR values
	 */
	if (rx) {
		/* set the INTENA_MSK_MASK so that this first write
		 * won't actually enable the interrupt, instead just
		 * updating the ITR (it's bit 31 PF and VF)
		 */
		rxval |= BIT(31);
		/* don't check _DOWN because interrupt isn't being enabled */
		wr32(hw, INTREG(vector - 1), rxval);
	}

enable_int:
	if (!test_bit(__I40E_VSI_DOWN, vsi->state))
		wr32(hw, INTREG(vector - 1), txval);

	if (q_vector->itr_countdown)
		q_vector->itr_countdown--;
	else
		q_vector->itr_countdown = ITR_COUNTDOWN_START;
}

/**
 * i40e_napi_poll - NAPI polling Rx/Tx cleanup routine
 * @napi: napi struct with our devices info in it
 * @budget: amount of work driver is allowed to do this pass, in packets
 *
 * This function will clean all queues associated with a q_vector.
 *
 * Returns the amount of work done
 **/
int i40e_napi_poll(struct napi_struct *napi, int budget)
{
	struct i40e_q_vector *q_vector =
			       container_of(napi, struct i40e_q_vector, napi);
	struct i40e_vsi *vsi = q_vector->vsi;
	struct i40e_ring *ring;
	bool clean_complete = true;
	bool arm_wb = false;
	int budget_per_ring;
	int work_done = 0;

	if (test_bit(__I40E_VSI_DOWN, vsi->state)) {
		napi_complete(napi);
		return 0;
	}

	/* Since the actual Tx work is minimal, we can give the Tx a larger
	 * budget and be more aggressive about cleaning up the Tx descriptors.
	 */
	i40e_for_each_ring(ring, q_vector->tx) {
		if (!i40e_clean_tx_irq(vsi, ring, budget)) {
			clean_complete = false;
			continue;
		}
		arm_wb |= ring->arm_wb;
		ring->arm_wb = false;
	}

	/* Handle case where we are called by netpoll with a budget of 0 */
	if (budget <= 0)
		goto tx_only;

	/* We attempt to distribute budget to each Rx queue fairly, but don't
	 * allow the budget to go below 1 because that would exit polling early.
	 */
	budget_per_ring = max(budget/q_vector->num_ringpairs, 1);

	i40e_for_each_ring(ring, q_vector->rx) {
		int cleaned = i40e_clean_rx_irq(ring, budget_per_ring);

		work_done += cleaned;
		/* if we clean as many as budgeted, we must not be done */
		if (cleaned >= budget_per_ring)
			clean_complete = false;
	}

	/* If work not completed, return budget and polling will return */
	if (!clean_complete) {
		int cpu_id = smp_processor_id();

		/* It is possible that the interrupt affinity has changed but,
		 * if the cpu is pegged at 100%, polling will never exit while
		 * traffic continues and the interrupt will be stuck on this
		 * cpu.  We check to make sure affinity is correct before we
		 * continue to poll, otherwise we must stop polling so the
		 * interrupt can move to the correct cpu.
		 */
		if (!cpumask_test_cpu(cpu_id, &q_vector->affinity_mask)) {
			/* Tell napi that we are done polling */
			napi_complete_done(napi, work_done);

			/* Force an interrupt */
			i40e_force_wb(vsi, q_vector);

			/* Return budget-1 so that polling stops */
			return budget - 1;
		}
tx_only:
		if (arm_wb) {
			q_vector->tx.ring[0].tx_stats.tx_force_wb++;
			i40e_enable_wb_on_itr(vsi, q_vector);
		}
		return budget;
	}

	if (vsi->back->flags & I40E_TXR_FLAGS_WB_ON_ITR)
		q_vector->arm_wb_state = false;

	/* Work is done so exit the polling mode and re-enable the interrupt */
	napi_complete_done(napi, work_done);

	i40e_update_enable_itr(vsi, q_vector);

	return min(work_done, budget - 1);
}

/**
 * i40e_atr - Add a Flow Director ATR filter
 * @tx_ring:  ring to add programming descriptor to
 * @skb:      send buffer
 * @tx_flags: send tx flags
 **/
static void i40e_atr(struct i40e_ring *tx_ring, struct sk_buff *skb,
		     u32 tx_flags)
{
	struct i40e_filter_program_desc *fdir_desc;
	struct i40e_pf *pf = tx_ring->vsi->back;
	union {
		unsigned char *network;
		struct iphdr *ipv4;
		struct ipv6hdr *ipv6;
	} hdr;
	struct tcphdr *th;
	unsigned int hlen;
	u32 flex_ptype, dtype_cmd;
	int l4_proto;
	u16 i;

	/* make sure ATR is enabled */
	if (!(pf->flags & I40E_FLAG_FD_ATR_ENABLED))
		return;

	if (pf->flags & I40E_FLAG_FD_ATR_AUTO_DISABLED)
		return;

	/* if sampling is disabled do nothing */
	if (!tx_ring->atr_sample_rate)
		return;

	/* Currently only IPv4/IPv6 with TCP is supported */
	if (!(tx_flags & (I40E_TX_FLAGS_IPV4 | I40E_TX_FLAGS_IPV6)))
		return;

	/* snag network header to get L4 type and address */
	hdr.network = (tx_flags & I40E_TX_FLAGS_UDP_TUNNEL) ?
		      skb_inner_network_header(skb) : skb_network_header(skb);

	/* Note: tx_flags gets modified to reflect inner protocols in
	 * tx_enable_csum function if encap is enabled.
	 */
	if (tx_flags & I40E_TX_FLAGS_IPV4) {
		/* access ihl as u8 to avoid unaligned access on ia64 */
		hlen = (hdr.network[0] & 0x0F) << 2;
		l4_proto = hdr.ipv4->protocol;
	} else {
		/* find the start of the innermost ipv6 header */
		unsigned int inner_hlen = hdr.network - skb->data;
		unsigned int h_offset = inner_hlen;

		/* this function updates h_offset to the end of the header */
		l4_proto =
		  ipv6_find_hdr(skb, &h_offset, IPPROTO_TCP, NULL, NULL);
		/* hlen will contain our best estimate of the tcp header */
		hlen = h_offset - inner_hlen;
	}

	if (l4_proto != IPPROTO_TCP)
		return;

	th = (struct tcphdr *)(hdr.network + hlen);

	/* Due to lack of space, no more new filters can be programmed */
	if (th->syn && (pf->flags & I40E_FLAG_FD_ATR_AUTO_DISABLED))
		return;
	if (pf->flags & I40E_FLAG_HW_ATR_EVICT_ENABLED) {
		/* HW ATR eviction will take care of removing filters on FIN
		 * and RST packets.
		 */
		if (th->fin || th->rst)
			return;
	}

	tx_ring->atr_count++;

	/* sample on all syn/fin/rst packets or once every atr sample rate */
	if (!th->fin &&
	    !th->syn &&
	    !th->rst &&
	    (tx_ring->atr_count < tx_ring->atr_sample_rate))
		return;

	tx_ring->atr_count = 0;

	/* grab the next descriptor */
	i = tx_ring->next_to_use;
	fdir_desc = I40E_TX_FDIRDESC(tx_ring, i);

	i++;
	tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;

	flex_ptype = (tx_ring->queue_index << I40E_TXD_FLTR_QW0_QINDEX_SHIFT) &
		      I40E_TXD_FLTR_QW0_QINDEX_MASK;
	flex_ptype |= (tx_flags & I40E_TX_FLAGS_IPV4) ?
		      (I40E_FILTER_PCTYPE_NONF_IPV4_TCP <<
		       I40E_TXD_FLTR_QW0_PCTYPE_SHIFT) :
		      (I40E_FILTER_PCTYPE_NONF_IPV6_TCP <<
		       I40E_TXD_FLTR_QW0_PCTYPE_SHIFT);

	flex_ptype |= tx_ring->vsi->id << I40E_TXD_FLTR_QW0_DEST_VSI_SHIFT;

	dtype_cmd = I40E_TX_DESC_DTYPE_FILTER_PROG;

	dtype_cmd |= (th->fin || th->rst) ?
		     (I40E_FILTER_PROGRAM_DESC_PCMD_REMOVE <<
		      I40E_TXD_FLTR_QW1_PCMD_SHIFT) :
		     (I40E_FILTER_PROGRAM_DESC_PCMD_ADD_UPDATE <<
		      I40E_TXD_FLTR_QW1_PCMD_SHIFT);

	dtype_cmd |= I40E_FILTER_PROGRAM_DESC_DEST_DIRECT_PACKET_QINDEX <<
		     I40E_TXD_FLTR_QW1_DEST_SHIFT;

	dtype_cmd |= I40E_FILTER_PROGRAM_DESC_FD_STATUS_FD_ID <<
		     I40E_TXD_FLTR_QW1_FD_STATUS_SHIFT;

	dtype_cmd |= I40E_TXD_FLTR_QW1_CNT_ENA_MASK;
	if (!(tx_flags & I40E_TX_FLAGS_UDP_TUNNEL))
		dtype_cmd |=
			((u32)I40E_FD_ATR_STAT_IDX(pf->hw.pf_id) <<
			I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT) &
			I40E_TXD_FLTR_QW1_CNTINDEX_MASK;
	else
		dtype_cmd |=
			((u32)I40E_FD_ATR_TUNNEL_STAT_IDX(pf->hw.pf_id) <<
			I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT) &
			I40E_TXD_FLTR_QW1_CNTINDEX_MASK;

	if (pf->flags & I40E_FLAG_HW_ATR_EVICT_ENABLED)
		dtype_cmd |= I40E_TXD_FLTR_QW1_ATR_MASK;

	fdir_desc->qindex_flex_ptype_vsi = cpu_to_le32(flex_ptype);
	fdir_desc->rsvd = cpu_to_le32(0);
	fdir_desc->dtype_cmd_cntindex = cpu_to_le32(dtype_cmd);
	fdir_desc->fd_id = cpu_to_le32(0);
}

/**
 * i40e_tx_prepare_vlan_flags - prepare generic TX VLAN tagging flags for HW
 * @skb:     send buffer
 * @tx_ring: ring to send buffer on
 * @flags:   the tx flags to be set
 *
 * Checks the skb and set up correspondingly several generic transmit flags
 * related to VLAN tagging for the HW, such as VLAN, DCB, etc.
 *
 * Returns error code indicate the frame should be dropped upon error and the
 * otherwise  returns 0 to indicate the flags has been set properly.
 **/
static inline int i40e_tx_prepare_vlan_flags(struct sk_buff *skb,
					     struct i40e_ring *tx_ring,
					     u32 *flags)
{
	__be16 protocol = skb->protocol;
	u32  tx_flags = 0;

	if (protocol == htons(ETH_P_8021Q) &&
	    !(tx_ring->netdev->features & NETIF_F_HW_VLAN_CTAG_TX)) {
		/* When HW VLAN acceleration is turned off by the user the
		 * stack sets the protocol to 8021q so that the driver
		 * can take any steps required to support the SW only
		 * VLAN handling.  In our case the driver doesn't need
		 * to take any further steps so just set the protocol
		 * to the encapsulated ethertype.
		 */
		skb->protocol = vlan_get_protocol(skb);
		goto out;
	}

	/* if we have a HW VLAN tag being added, default to the HW one */
	if (skb_vlan_tag_present(skb)) {
		tx_flags |= skb_vlan_tag_get(skb) << I40E_TX_FLAGS_VLAN_SHIFT;
		tx_flags |= I40E_TX_FLAGS_HW_VLAN;
	/* else if it is a SW VLAN, check the next protocol and store the tag */
	} else if (protocol == htons(ETH_P_8021Q)) {
		struct vlan_hdr *vhdr, _vhdr;

		vhdr = skb_header_pointer(skb, ETH_HLEN, sizeof(_vhdr), &_vhdr);
		if (!vhdr)
			return -EINVAL;

		protocol = vhdr->h_vlan_encapsulated_proto;
		tx_flags |= ntohs(vhdr->h_vlan_TCI) << I40E_TX_FLAGS_VLAN_SHIFT;
		tx_flags |= I40E_TX_FLAGS_SW_VLAN;
	}

	if (!(tx_ring->vsi->back->flags & I40E_FLAG_DCB_ENABLED))
		goto out;

	/* Insert 802.1p priority into VLAN header */
	if ((tx_flags & (I40E_TX_FLAGS_HW_VLAN | I40E_TX_FLAGS_SW_VLAN)) ||
	    (skb->priority != TC_PRIO_CONTROL)) {
		tx_flags &= ~I40E_TX_FLAGS_VLAN_PRIO_MASK;
		tx_flags |= (skb->priority & 0x7) <<
				I40E_TX_FLAGS_VLAN_PRIO_SHIFT;
		if (tx_flags & I40E_TX_FLAGS_SW_VLAN) {
			struct vlan_ethhdr *vhdr;
			int rc;

			rc = skb_cow_head(skb, 0);
			if (rc < 0)
				return rc;
			vhdr = (struct vlan_ethhdr *)skb->data;
			vhdr->h_vlan_TCI = htons(tx_flags >>
						 I40E_TX_FLAGS_VLAN_SHIFT);
		} else {
			tx_flags |= I40E_TX_FLAGS_HW_VLAN;
		}
	}

out:
	*flags = tx_flags;
	return 0;
}

/**
 * i40e_tso - set up the tso context descriptor
 * @first:    pointer to first Tx buffer for xmit
 * @hdr_len:  ptr to the size of the packet header
 * @cd_type_cmd_tso_mss: Quad Word 1
 *
 * Returns 0 if no TSO can happen, 1 if tso is going, or error
 **/
static int i40e_tso(struct i40e_tx_buffer *first, u8 *hdr_len,
		    u64 *cd_type_cmd_tso_mss)
{
	struct sk_buff *skb = first->skb;
	u64 cd_cmd, cd_tso_len, cd_mss;
	union {
		struct iphdr *v4;
		struct ipv6hdr *v6;
		unsigned char *hdr;
	} ip;
	union {
		struct tcphdr *tcp;
		struct udphdr *udp;
		unsigned char *hdr;
	} l4;
	u32 paylen, l4_offset;
	u16 gso_segs, gso_size;
	int err;

	if (skb->ip_summed != CHECKSUM_PARTIAL)
		return 0;

	if (!skb_is_gso(skb))
		return 0;

	err = skb_cow_head(skb, 0);
	if (err < 0)
		return err;

	ip.hdr = skb_network_header(skb);
	l4.hdr = skb_transport_header(skb);

	/* initialize outer IP header fields */
	if (ip.v4->version == 4) {
		ip.v4->tot_len = 0;
		ip.v4->check = 0;
	} else {
		ip.v6->payload_len = 0;
	}

	if (skb_shinfo(skb)->gso_type & (SKB_GSO_GRE |
					 SKB_GSO_GRE_CSUM |
					 SKB_GSO_IPXIP4 |
					 SKB_GSO_IPXIP6 |
					 SKB_GSO_UDP_TUNNEL |
					 SKB_GSO_UDP_TUNNEL_CSUM)) {
		if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) {
			l4.udp->len = 0;

			/* determine offset of outer transport header */
			l4_offset = l4.hdr - skb->data;

			/* remove payload length from outer checksum */
			paylen = skb->len - l4_offset;
			csum_replace_by_diff(&l4.udp->check,
					     (__force __wsum)htonl(paylen));
		}

		/* reset pointers to inner headers */
		ip.hdr = skb_inner_network_header(skb);
		l4.hdr = skb_inner_transport_header(skb);

		/* initialize inner IP header fields */
		if (ip.v4->version == 4) {
			ip.v4->tot_len = 0;
			ip.v4->check = 0;
		} else {
			ip.v6->payload_len = 0;
		}
	}

	/* determine offset of inner transport header */
	l4_offset = l4.hdr - skb->data;

	/* remove payload length from inner checksum */
	paylen = skb->len - l4_offset;
	csum_replace_by_diff(&l4.tcp->check, (__force __wsum)htonl(paylen));

	/* compute length of segmentation header */
	*hdr_len = (l4.tcp->doff * 4) + l4_offset;

	/* pull values out of skb_shinfo */
	gso_size = skb_shinfo(skb)->gso_size;
	gso_segs = skb_shinfo(skb)->gso_segs;

	/* update GSO size and bytecount with header size */
	first->gso_segs = gso_segs;
	first->bytecount += (first->gso_segs - 1) * *hdr_len;

	/* find the field values */
	cd_cmd = I40E_TX_CTX_DESC_TSO;
	cd_tso_len = skb->len - *hdr_len;
	cd_mss = gso_size;
	*cd_type_cmd_tso_mss |= (cd_cmd << I40E_TXD_CTX_QW1_CMD_SHIFT) |
				(cd_tso_len << I40E_TXD_CTX_QW1_TSO_LEN_SHIFT) |
				(cd_mss << I40E_TXD_CTX_QW1_MSS_SHIFT);
	return 1;
}

/**
 * i40e_tsyn - set up the tsyn context descriptor
 * @tx_ring:  ptr to the ring to send
 * @skb:      ptr to the skb we're sending
 * @tx_flags: the collected send information
 * @cd_type_cmd_tso_mss: Quad Word 1
 *
 * Returns 0 if no Tx timestamp can happen and 1 if the timestamp will happen
 **/
static int i40e_tsyn(struct i40e_ring *tx_ring, struct sk_buff *skb,
		     u32 tx_flags, u64 *cd_type_cmd_tso_mss)
{
	struct i40e_pf *pf;

	if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)))
		return 0;

	/* Tx timestamps cannot be sampled when doing TSO */
	if (tx_flags & I40E_TX_FLAGS_TSO)
		return 0;

	/* only timestamp the outbound packet if the user has requested it and
	 * we are not already transmitting a packet to be timestamped
	 */
	pf = i40e_netdev_to_pf(tx_ring->netdev);
	if (!(pf->flags & I40E_FLAG_PTP))
		return 0;

	if (pf->ptp_tx &&
	    !test_and_set_bit_lock(__I40E_PTP_TX_IN_PROGRESS, pf->state)) {
		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
		pf->ptp_tx_start = jiffies;
		pf->ptp_tx_skb = skb_get(skb);
	} else {
		pf->tx_hwtstamp_skipped++;
		return 0;
	}

	*cd_type_cmd_tso_mss |= (u64)I40E_TX_CTX_DESC_TSYN <<
				I40E_TXD_CTX_QW1_CMD_SHIFT;

	return 1;
}

/**
 * i40e_tx_enable_csum - Enable Tx checksum offloads
 * @skb: send buffer
 * @tx_flags: pointer to Tx flags currently set
 * @td_cmd: Tx descriptor command bits to set
 * @td_offset: Tx descriptor header offsets to set
 * @tx_ring: Tx descriptor ring
 * @cd_tunneling: ptr to context desc bits
 **/
static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
			       u32 *td_cmd, u32 *td_offset,
			       struct i40e_ring *tx_ring,
			       u32 *cd_tunneling)
{
	union {
		struct iphdr *v4;
		struct ipv6hdr *v6;
		unsigned char *hdr;
	} ip;
	union {
		struct tcphdr *tcp;
		struct udphdr *udp;
		unsigned char *hdr;
	} l4;
	unsigned char *exthdr;
	u32 offset, cmd = 0;
	__be16 frag_off;
	u8 l4_proto = 0;

	if (skb->ip_summed != CHECKSUM_PARTIAL)
		return 0;

	ip.hdr = skb_network_header(skb);
	l4.hdr = skb_transport_header(skb);

	/* compute outer L2 header size */
	offset = ((ip.hdr - skb->data) / 2) << I40E_TX_DESC_LENGTH_MACLEN_SHIFT;

	if (skb->encapsulation) {
		u32 tunnel = 0;
		/* define outer network header type */
		if (*tx_flags & I40E_TX_FLAGS_IPV4) {
			tunnel |= (*tx_flags & I40E_TX_FLAGS_TSO) ?
				  I40E_TX_CTX_EXT_IP_IPV4 :
				  I40E_TX_CTX_EXT_IP_IPV4_NO_CSUM;

			l4_proto = ip.v4->protocol;
		} else if (*tx_flags & I40E_TX_FLAGS_IPV6) {
			tunnel |= I40E_TX_CTX_EXT_IP_IPV6;

			exthdr = ip.hdr + sizeof(*ip.v6);
			l4_proto = ip.v6->nexthdr;
			if (l4.hdr != exthdr)
				ipv6_skip_exthdr(skb, exthdr - skb->data,
						 &l4_proto, &frag_off);
		}

		/* define outer transport */
		switch (l4_proto) {
		case IPPROTO_UDP:
			tunnel |= I40E_TXD_CTX_UDP_TUNNELING;
			*tx_flags |= I40E_TX_FLAGS_UDP_TUNNEL;
			break;
		case IPPROTO_GRE:
			tunnel |= I40E_TXD_CTX_GRE_TUNNELING;
			*tx_flags |= I40E_TX_FLAGS_UDP_TUNNEL;
			break;
		case IPPROTO_IPIP:
		case IPPROTO_IPV6:
			*tx_flags |= I40E_TX_FLAGS_UDP_TUNNEL;
			l4.hdr = skb_inner_network_header(skb);
			break;
		default:
			if (*tx_flags & I40E_TX_FLAGS_TSO)
				return -1;

			skb_checksum_help(skb);
			return 0;
		}

		/* compute outer L3 header size */
		tunnel |= ((l4.hdr - ip.hdr) / 4) <<
			  I40E_TXD_CTX_QW0_EXT_IPLEN_SHIFT;

		/* switch IP header pointer from outer to inner header */
		ip.hdr = skb_inner_network_header(skb);

		/* compute tunnel header size */
		tunnel |= ((ip.hdr - l4.hdr) / 2) <<
			  I40E_TXD_CTX_QW0_NATLEN_SHIFT;

		/* indicate if we need to offload outer UDP header */
		if ((*tx_flags & I40E_TX_FLAGS_TSO) &&
		    !(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM))
			tunnel |= I40E_TXD_CTX_QW0_L4T_CS_MASK;

		/* record tunnel offload values */
		*cd_tunneling |= tunnel;

		/* switch L4 header pointer from outer to inner */
		l4.hdr = skb_inner_transport_header(skb);
		l4_proto = 0;

		/* reset type as we transition from outer to inner headers */
		*tx_flags &= ~(I40E_TX_FLAGS_IPV4 | I40E_TX_FLAGS_IPV6);
		if (ip.v4->version == 4)
			*tx_flags |= I40E_TX_FLAGS_IPV4;
		if (ip.v6->version == 6)
			*tx_flags |= I40E_TX_FLAGS_IPV6;
	}

	/* Enable IP checksum offloads */
	if (*tx_flags & I40E_TX_FLAGS_IPV4) {
		l4_proto = ip.v4->protocol;
		/* the stack computes the IP header already, the only time we
		 * need the hardware to recompute it is in the case of TSO.
		 */
		cmd |= (*tx_flags & I40E_TX_FLAGS_TSO) ?
		       I40E_TX_DESC_CMD_IIPT_IPV4_CSUM :
		       I40E_TX_DESC_CMD_IIPT_IPV4;
	} else if (*tx_flags & I40E_TX_FLAGS_IPV6) {
		cmd |= I40E_TX_DESC_CMD_IIPT_IPV6;

		exthdr = ip.hdr + sizeof(*ip.v6);
		l4_proto = ip.v6->nexthdr;
		if (l4.hdr != exthdr)
			ipv6_skip_exthdr(skb, exthdr - skb->data,
					 &l4_proto, &frag_off);
	}

	/* compute inner L3 header size */
	offset |= ((l4.hdr - ip.hdr) / 4) << I40E_TX_DESC_LENGTH_IPLEN_SHIFT;

	/* Enable L4 checksum offloads */
	switch (l4_proto) {
	case IPPROTO_TCP:
		/* enable checksum offloads */
		cmd |= I40E_TX_DESC_CMD_L4T_EOFT_TCP;
		offset |= l4.tcp->doff << I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT;
		break;
	case IPPROTO_SCTP:
		/* enable SCTP checksum offload */
		cmd |= I40E_TX_DESC_CMD_L4T_EOFT_SCTP;
		offset |= (sizeof(struct sctphdr) >> 2) <<
			  I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT;
		break;
	case IPPROTO_UDP:
		/* enable UDP checksum offload */
		cmd |= I40E_TX_DESC_CMD_L4T_EOFT_UDP;
		offset |= (sizeof(struct udphdr) >> 2) <<
			  I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT;
		break;
	default:
		if (*tx_flags & I40E_TX_FLAGS_TSO)
			return -1;
		skb_checksum_help(skb);
		return 0;
	}

	*td_cmd |= cmd;
	*td_offset |= offset;

	return 1;
}

/**
 * i40e_create_tx_ctx Build the Tx context descriptor
 * @tx_ring:  ring to create the descriptor on
 * @cd_type_cmd_tso_mss: Quad Word 1
 * @cd_tunneling: Quad Word 0 - bits 0-31
 * @cd_l2tag2: Quad Word 0 - bits 32-63
 **/
static void i40e_create_tx_ctx(struct i40e_ring *tx_ring,
			       const u64 cd_type_cmd_tso_mss,
			       const u32 cd_tunneling, const u32 cd_l2tag2)
{
	struct i40e_tx_context_desc *context_desc;
	int i = tx_ring->next_to_use;

	if ((cd_type_cmd_tso_mss == I40E_TX_DESC_DTYPE_CONTEXT) &&
	    !cd_tunneling && !cd_l2tag2)
		return;

	/* grab the next descriptor */
	context_desc = I40E_TX_CTXTDESC(tx_ring, i);

	i++;
	tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;

	/* cpu_to_le32 and assign to struct fields */
	context_desc->tunneling_params = cpu_to_le32(cd_tunneling);
	context_desc->l2tag2 = cpu_to_le16(cd_l2tag2);
	context_desc->rsvd = cpu_to_le16(0);
	context_desc->type_cmd_tso_mss = cpu_to_le64(cd_type_cmd_tso_mss);
}

/**
 * __i40e_maybe_stop_tx - 2nd level check for tx stop conditions
 * @tx_ring: the ring to be checked
 * @size:    the size buffer we want to assure is available
 *
 * Returns -EBUSY if a stop is needed, else 0
 **/
int __i40e_maybe_stop_tx(struct i40e_ring *tx_ring, int size)
{
	netif_stop_subqueue(tx_ring->netdev, tx_ring->queue_index);
	/* Memory barrier before checking head and tail */
	smp_mb();

	/* Check again in a case another CPU has just made room available. */
	if (likely(I40E_DESC_UNUSED(tx_ring) < size))
		return -EBUSY;

	/* A reprieve! - use start_queue because it doesn't call schedule */
	netif_start_subqueue(tx_ring->netdev, tx_ring->queue_index);
	++tx_ring->tx_stats.restart_queue;
	return 0;
}

/**
 * __i40e_chk_linearize - Check if there are more than 8 buffers per packet
 * @skb:      send buffer
 *
 * Note: Our HW can't DMA more than 8 buffers to build a packet on the wire
 * and so we need to figure out the cases where we need to linearize the skb.
 *
 * For TSO we need to count the TSO header and segment payload separately.
 * As such we need to check cases where we have 7 fragments or more as we
 * can potentially require 9 DMA transactions, 1 for the TSO header, 1 for
 * the segment payload in the first descriptor, and another 7 for the
 * fragments.
 **/
bool __i40e_chk_linearize(struct sk_buff *skb)
{
	const struct skb_frag_struct *frag, *stale;
	int nr_frags, sum;

	/* no need to check if number of frags is less than 7 */
	nr_frags = skb_shinfo(skb)->nr_frags;
	if (nr_frags < (I40E_MAX_BUFFER_TXD - 1))
		return false;

	/* We need to walk through the list and validate that each group
	 * of 6 fragments totals at least gso_size.
	 */
	nr_frags -= I40E_MAX_BUFFER_TXD - 2;
	frag = &skb_shinfo(skb)->frags[0];

	/* Initialize size to the negative value of gso_size minus 1.  We
	 * use this as the worst case scenerio in which the frag ahead
	 * of us only provides one byte which is why we are limited to 6
	 * descriptors for a single transmit as the header and previous
	 * fragment are already consuming 2 descriptors.
	 */
	sum = 1 - skb_shinfo(skb)->gso_size;

	/* Add size of frags 0 through 4 to create our initial sum */
	sum += skb_frag_size(frag++);
	sum += skb_frag_size(frag++);
	sum += skb_frag_size(frag++);
	sum += skb_frag_size(frag++);
	sum += skb_frag_size(frag++);

	/* Walk through fragments adding latest fragment, testing it, and
	 * then removing stale fragments from the sum.
	 */
	stale = &skb_shinfo(skb)->frags[0];
	for (;;) {
		sum += skb_frag_size(frag++);

		/* if sum is negative we failed to make sufficient progress */
		if (sum < 0)
			return true;

		if (!nr_frags--)
			break;

		sum -= skb_frag_size(stale++);
	}

	return false;
}

/**
 * i40e_tx_map - Build the Tx descriptor
 * @tx_ring:  ring to send buffer on
 * @skb:      send buffer
 * @first:    first buffer info buffer to use
 * @tx_flags: collected send information
 * @hdr_len:  size of the packet header
 * @td_cmd:   the command field in the descriptor
 * @td_offset: offset for checksum or crc
 *
 * Returns 0 on success, -1 on failure to DMA
 **/
static inline int i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb,
			      struct i40e_tx_buffer *first, u32 tx_flags,
			      const u8 hdr_len, u32 td_cmd, u32 td_offset)
{
	unsigned int data_len = skb->data_len;
	unsigned int size = skb_headlen(skb);
	struct skb_frag_struct *frag;
	struct i40e_tx_buffer *tx_bi;
	struct i40e_tx_desc *tx_desc;
	u16 i = tx_ring->next_to_use;
	u32 td_tag = 0;
	dma_addr_t dma;
	u16 desc_count = 1;

	if (tx_flags & I40E_TX_FLAGS_HW_VLAN) {
		td_cmd |= I40E_TX_DESC_CMD_IL2TAG1;
		td_tag = (tx_flags & I40E_TX_FLAGS_VLAN_MASK) >>
			 I40E_TX_FLAGS_VLAN_SHIFT;
	}

	first->tx_flags = tx_flags;

	dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE);

	tx_desc = I40E_TX_DESC(tx_ring, i);
	tx_bi = first;

	for (frag = &skb_shinfo(skb)->frags[0];; frag++) {
		unsigned int max_data = I40E_MAX_DATA_PER_TXD_ALIGNED;

		if (dma_mapping_error(tx_ring->dev, dma))
			goto dma_error;

		/* record length, and DMA address */
		dma_unmap_len_set(tx_bi, len, size);
		dma_unmap_addr_set(tx_bi, dma, dma);

		/* align size to end of page */
		max_data += -dma & (I40E_MAX_READ_REQ_SIZE - 1);
		tx_desc->buffer_addr = cpu_to_le64(dma);

		while (unlikely(size > I40E_MAX_DATA_PER_TXD)) {
			tx_desc->cmd_type_offset_bsz =
				build_ctob(td_cmd, td_offset,
					   max_data, td_tag);

			tx_desc++;
			i++;
			desc_count++;

			if (i == tx_ring->count) {
				tx_desc = I40E_TX_DESC(tx_ring, 0);
				i = 0;
			}

			dma += max_data;
			size -= max_data;

			max_data = I40E_MAX_DATA_PER_TXD_ALIGNED;
			tx_desc->buffer_addr = cpu_to_le64(dma);
		}

		if (likely(!data_len))
			break;

		tx_desc->cmd_type_offset_bsz = build_ctob(td_cmd, td_offset,
							  size, td_tag);

		tx_desc++;
		i++;
		desc_count++;

		if (i == tx_ring->count) {
			tx_desc = I40E_TX_DESC(tx_ring, 0);
			i = 0;
		}

		size = skb_frag_size(frag);
		data_len -= size;

		dma = skb_frag_dma_map(tx_ring->dev, frag, 0, size,
				       DMA_TO_DEVICE);

		tx_bi = &tx_ring->tx_bi[i];
	}

	netdev_tx_sent_queue(txring_txq(tx_ring), first->bytecount);

	i++;
	if (i == tx_ring->count)
		i = 0;

	tx_ring->next_to_use = i;

	i40e_maybe_stop_tx(tx_ring, DESC_NEEDED);

	/* write last descriptor with EOP bit */
	td_cmd |= I40E_TX_DESC_CMD_EOP;

	/* We can OR these values together as they both are checked against
	 * 4 below and at this point desc_count will be used as a boolean value
	 * after this if/else block.
	 */
	desc_count |= ++tx_ring->packet_stride;

	/* Algorithm to optimize tail and RS bit setting:
	 * if queue is stopped
	 *	mark RS bit
	 *	reset packet counter
	 * else if xmit_more is supported and is true
	 *	advance packet counter to 4
	 *	reset desc_count to 0
	 *
	 * if desc_count >= 4
	 *	mark RS bit
	 *	reset packet counter
	 * if desc_count > 0
	 *	update tail
	 *
	 * Note: If there are less than 4 descriptors
	 * pending and interrupts were disabled the service task will
	 * trigger a force WB.
	 */
	if (netif_xmit_stopped(txring_txq(tx_ring))) {
		goto do_rs;
	} else if (skb->xmit_more) {
		/* set stride to arm on next packet and reset desc_count */
		tx_ring->packet_stride = WB_STRIDE;
		desc_count = 0;
	} else if (desc_count >= WB_STRIDE) {
do_rs:
		/* write last descriptor with RS bit set */
		td_cmd |= I40E_TX_DESC_CMD_RS;
		tx_ring->packet_stride = 0;
	}

	tx_desc->cmd_type_offset_bsz =
			build_ctob(td_cmd, td_offset, size, td_tag);

	/* Force memory writes to complete before letting h/w know there
	 * are new descriptors to fetch.
	 *
	 * We also use this memory barrier to make certain all of the
	 * status bits have been updated before next_to_watch is written.
	 */
	wmb();

	/* set next_to_watch value indicating a packet is present */
	first->next_to_watch = tx_desc;

	/* notify HW of packet */
	if (desc_count) {
		writel(i, tx_ring->tail);

		/* we need this if more than one processor can write to our tail
		 * at a time, it synchronizes IO on IA64/Altix systems
		 */
		mmiowb();
	}

	return 0;

dma_error:
	dev_info(tx_ring->dev, "TX DMA map failed\n");

	/* clear dma mappings for failed tx_bi map */
	for (;;) {
		tx_bi = &tx_ring->tx_bi[i];
		i40e_unmap_and_free_tx_resource(tx_ring, tx_bi);
		if (tx_bi == first)
			break;
		if (i == 0)
			i = tx_ring->count;
		i--;
	}

	tx_ring->next_to_use = i;

	return -1;
}

/**
 * i40e_xmit_xdp_ring - transmits an XDP buffer to an XDP Tx ring
 * @xdp: data to transmit
 * @xdp_ring: XDP Tx ring
 **/
static int i40e_xmit_xdp_ring(struct xdp_buff *xdp,
			      struct i40e_ring *xdp_ring)
{
	u32 size = xdp->data_end - xdp->data;
	u16 i = xdp_ring->next_to_use;
	struct i40e_tx_buffer *tx_bi;
	struct i40e_tx_desc *tx_desc;
	dma_addr_t dma;

	if (!unlikely(I40E_DESC_UNUSED(xdp_ring))) {
		xdp_ring->tx_stats.tx_busy++;
		return I40E_XDP_CONSUMED;
	}

	dma = dma_map_single(xdp_ring->dev, xdp->data, size, DMA_TO_DEVICE);
	if (dma_mapping_error(xdp_ring->dev, dma))
		return I40E_XDP_CONSUMED;

	tx_bi = &xdp_ring->tx_bi[i];
	tx_bi->bytecount = size;
	tx_bi->gso_segs = 1;
	tx_bi->raw_buf = xdp->data;

	/* record length, and DMA address */
	dma_unmap_len_set(tx_bi, len, size);
	dma_unmap_addr_set(tx_bi, dma, dma);

	tx_desc = I40E_TX_DESC(xdp_ring, i);
	tx_desc->buffer_addr = cpu_to_le64(dma);
	tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC
						  | I40E_TXD_CMD,
						  0, size, 0);

	/* Make certain all of the status bits have been updated
	 * before next_to_watch is written.
	 */
	smp_wmb();

	i++;
	if (i == xdp_ring->count)
		i = 0;

	tx_bi->next_to_watch = tx_desc;
	xdp_ring->next_to_use = i;

	return I40E_XDP_TX;
}

/**
 * i40e_xmit_frame_ring - Sends buffer on Tx ring
 * @skb:     send buffer
 * @tx_ring: ring to send buffer on
 *
 * Returns NETDEV_TX_OK if sent, else an error code
 **/
static netdev_tx_t i40e_xmit_frame_ring(struct sk_buff *skb,
					struct i40e_ring *tx_ring)
{
	u64 cd_type_cmd_tso_mss = I40E_TX_DESC_DTYPE_CONTEXT;
	u32 cd_tunneling = 0, cd_l2tag2 = 0;
	struct i40e_tx_buffer *first;
	u32 td_offset = 0;
	u32 tx_flags = 0;
	__be16 protocol;
	u32 td_cmd = 0;
	u8 hdr_len = 0;
	int tso, count;
	int tsyn;

	/* prefetch the data, we'll need it later */
	prefetch(skb->data);

	i40e_trace(xmit_frame_ring, skb, tx_ring);

	count = i40e_xmit_descriptor_count(skb);
	if (i40e_chk_linearize(skb, count)) {
		if (__skb_linearize(skb)) {
			dev_kfree_skb_any(skb);
			return NETDEV_TX_OK;
		}
		count = i40e_txd_use_count(skb->len);
		tx_ring->tx_stats.tx_linearize++;
	}

	/* need: 1 descriptor per page * PAGE_SIZE/I40E_MAX_DATA_PER_TXD,
	 *       + 1 desc for skb_head_len/I40E_MAX_DATA_PER_TXD,
	 *       + 4 desc gap to avoid the cache line where head is,
	 *       + 1 desc for context descriptor,
	 * otherwise try next time
	 */
	if (i40e_maybe_stop_tx(tx_ring, count + 4 + 1)) {
		tx_ring->tx_stats.tx_busy++;
		return NETDEV_TX_BUSY;
	}

	/* record the location of the first descriptor for this packet */
	first = &tx_ring->tx_bi[tx_ring->next_to_use];
	first->skb = skb;
	first->bytecount = skb->len;
	first->gso_segs = 1;

	/* prepare the xmit flags */
	if (i40e_tx_prepare_vlan_flags(skb, tx_ring, &tx_flags))
		goto out_drop;

	/* obtain protocol of skb */
	protocol = vlan_get_protocol(skb);

	/* setup IPv4/IPv6 offloads */
	if (protocol == htons(ETH_P_IP))
		tx_flags |= I40E_TX_FLAGS_IPV4;
	else if (protocol == htons(ETH_P_IPV6))
		tx_flags |= I40E_TX_FLAGS_IPV6;

	tso = i40e_tso(first, &hdr_len, &cd_type_cmd_tso_mss);

	if (tso < 0)
		goto out_drop;
	else if (tso)
		tx_flags |= I40E_TX_FLAGS_TSO;

	/* Always offload the checksum, since it's in the data descriptor */
	tso = i40e_tx_enable_csum(skb, &tx_flags, &td_cmd, &td_offset,
				  tx_ring, &cd_tunneling);
	if (tso < 0)
		goto out_drop;

	tsyn = i40e_tsyn(tx_ring, skb, tx_flags, &cd_type_cmd_tso_mss);

	if (tsyn)
		tx_flags |= I40E_TX_FLAGS_TSYN;

	skb_tx_timestamp(skb);

	/* always enable CRC insertion offload */
	td_cmd |= I40E_TX_DESC_CMD_ICRC;

	i40e_create_tx_ctx(tx_ring, cd_type_cmd_tso_mss,
			   cd_tunneling, cd_l2tag2);

	/* Add Flow Director ATR if it's enabled.
	 *
	 * NOTE: this must always be directly before the data descriptor.
	 */
	i40e_atr(tx_ring, skb, tx_flags);

	if (i40e_tx_map(tx_ring, skb, first, tx_flags, hdr_len,
			td_cmd, td_offset))
		goto cleanup_tx_tstamp;

	return NETDEV_TX_OK;

out_drop:
	i40e_trace(xmit_frame_ring_drop, first->skb, tx_ring);
	dev_kfree_skb_any(first->skb);
	first->skb = NULL;
cleanup_tx_tstamp:
	if (unlikely(tx_flags & I40E_TX_FLAGS_TSYN)) {
		struct i40e_pf *pf = i40e_netdev_to_pf(tx_ring->netdev);

		dev_kfree_skb_any(pf->ptp_tx_skb);
		pf->ptp_tx_skb = NULL;
		clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
	}

	return NETDEV_TX_OK;
}

/**
 * i40e_lan_xmit_frame - Selects the correct VSI and Tx queue to send buffer
 * @skb:    send buffer
 * @netdev: network interface device structure
 *
 * Returns NETDEV_TX_OK if sent, else an error code
 **/
netdev_tx_t i40e_lan_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
	struct i40e_netdev_priv *np = netdev_priv(netdev);
	struct i40e_vsi *vsi = np->vsi;
	struct i40e_ring *tx_ring = vsi->tx_rings[skb->queue_mapping];

	/* hardware can't handle really short frames, hardware padding works
	 * beyond this point
	 */
	if (skb_put_padto(skb, I40E_MIN_TX_LEN))
		return NETDEV_TX_OK;

	return i40e_xmit_frame_ring(skb, tx_ring);
}