summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/netronome/nfp/flower/offload.c
blob: 9d65459bdba59f105de52df169cf2c4012a6ef27 (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
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2017-2018 Netronome Systems, Inc. */

#include <linux/skbuff.h>
#include <net/devlink.h>
#include <net/pkt_cls.h>

#include "cmsg.h"
#include "main.h"
#include "conntrack.h"
#include "../nfpcore/nfp_cpp.h"
#include "../nfpcore/nfp_nsp.h"
#include "../nfp_app.h"
#include "../nfp_main.h"
#include "../nfp_net.h"
#include "../nfp_port.h"

#define NFP_FLOWER_SUPPORTED_TCPFLAGS \
	(TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST | \
	 TCPHDR_PSH | TCPHDR_URG)

#define NFP_FLOWER_SUPPORTED_CTLFLAGS \
	(FLOW_DIS_IS_FRAGMENT | \
	 FLOW_DIS_FIRST_FRAG)

#define NFP_FLOWER_WHITELIST_DISSECTOR \
	(BIT(FLOW_DISSECTOR_KEY_CONTROL) | \
	 BIT(FLOW_DISSECTOR_KEY_BASIC) | \
	 BIT(FLOW_DISSECTOR_KEY_IPV4_ADDRS) | \
	 BIT(FLOW_DISSECTOR_KEY_IPV6_ADDRS) | \
	 BIT(FLOW_DISSECTOR_KEY_TCP) | \
	 BIT(FLOW_DISSECTOR_KEY_PORTS) | \
	 BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS) | \
	 BIT(FLOW_DISSECTOR_KEY_VLAN) | \
	 BIT(FLOW_DISSECTOR_KEY_CVLAN) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_KEYID) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_PORTS) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_OPTS) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_IP) | \
	 BIT(FLOW_DISSECTOR_KEY_MPLS) | \
	 BIT(FLOW_DISSECTOR_KEY_CT) | \
	 BIT(FLOW_DISSECTOR_KEY_META) | \
	 BIT(FLOW_DISSECTOR_KEY_IP))

#define NFP_FLOWER_WHITELIST_TUN_DISSECTOR \
	(BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_KEYID) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_OPTS) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_PORTS) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_IP))

#define NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R \
	(BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS))

#define NFP_FLOWER_WHITELIST_TUN_DISSECTOR_V6_R \
	(BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
	 BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS))

#define NFP_FLOWER_MERGE_FIELDS \
	(NFP_FLOWER_LAYER_PORT | \
	 NFP_FLOWER_LAYER_MAC | \
	 NFP_FLOWER_LAYER_TP | \
	 NFP_FLOWER_LAYER_IPV4 | \
	 NFP_FLOWER_LAYER_IPV6)

#define NFP_FLOWER_PRE_TUN_RULE_FIELDS \
	(NFP_FLOWER_LAYER_EXT_META | \
	 NFP_FLOWER_LAYER_PORT | \
	 NFP_FLOWER_LAYER_MAC | \
	 NFP_FLOWER_LAYER_IPV4 | \
	 NFP_FLOWER_LAYER_IPV6)

struct nfp_flower_merge_check {
	union {
		struct {
			__be16 tci;
			struct nfp_flower_mac_mpls l2;
			struct nfp_flower_tp_ports l4;
			union {
				struct nfp_flower_ipv4 ipv4;
				struct nfp_flower_ipv6 ipv6;
			};
		};
		unsigned long vals[8];
	};
};

int
nfp_flower_xmit_flow(struct nfp_app *app, struct nfp_fl_payload *nfp_flow,
		     u8 mtype)
{
	u32 meta_len, key_len, mask_len, act_len, tot_len;
	struct sk_buff *skb;
	unsigned char *msg;

	meta_len =  sizeof(struct nfp_fl_rule_metadata);
	key_len = nfp_flow->meta.key_len;
	mask_len = nfp_flow->meta.mask_len;
	act_len = nfp_flow->meta.act_len;

	tot_len = meta_len + key_len + mask_len + act_len;

	/* Convert to long words as firmware expects
	 * lengths in units of NFP_FL_LW_SIZ.
	 */
	nfp_flow->meta.key_len >>= NFP_FL_LW_SIZ;
	nfp_flow->meta.mask_len >>= NFP_FL_LW_SIZ;
	nfp_flow->meta.act_len >>= NFP_FL_LW_SIZ;

	skb = nfp_flower_cmsg_alloc(app, tot_len, mtype, GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	msg = nfp_flower_cmsg_get_data(skb);
	memcpy(msg, &nfp_flow->meta, meta_len);
	memcpy(&msg[meta_len], nfp_flow->unmasked_data, key_len);
	memcpy(&msg[meta_len + key_len], nfp_flow->mask_data, mask_len);
	memcpy(&msg[meta_len + key_len + mask_len],
	       nfp_flow->action_data, act_len);

	/* Convert back to bytes as software expects
	 * lengths in units of bytes.
	 */
	nfp_flow->meta.key_len <<= NFP_FL_LW_SIZ;
	nfp_flow->meta.mask_len <<= NFP_FL_LW_SIZ;
	nfp_flow->meta.act_len <<= NFP_FL_LW_SIZ;

	nfp_ctrl_tx(app->ctrl, skb);

	return 0;
}

static bool nfp_flower_check_higher_than_mac(struct flow_rule *rule)
{
	return flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS) ||
	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS) ||
	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS) ||
	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP);
}

static bool nfp_flower_check_higher_than_l3(struct flow_rule *rule)
{
	return flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS) ||
	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP);
}

static int
nfp_flower_calc_opt_layer(struct flow_dissector_key_enc_opts *enc_opts,
			  u32 *key_layer_two, int *key_size, bool ipv6,
			  struct netlink_ext_ack *extack)
{
	if (enc_opts->len > NFP_FL_MAX_GENEVE_OPT_KEY ||
	    (ipv6 && enc_opts->len > NFP_FL_MAX_GENEVE_OPT_KEY_V6)) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: geneve options exceed maximum length");
		return -EOPNOTSUPP;
	}

	if (enc_opts->len > 0) {
		*key_layer_two |= NFP_FLOWER_LAYER2_GENEVE_OP;
		*key_size += sizeof(struct nfp_flower_geneve_options);
	}

	return 0;
}

static int
nfp_flower_calc_udp_tun_layer(struct flow_dissector_key_ports *enc_ports,
			      struct flow_dissector_key_enc_opts *enc_op,
			      u32 *key_layer_two, u8 *key_layer, int *key_size,
			      struct nfp_flower_priv *priv,
			      enum nfp_flower_tun_type *tun_type, bool ipv6,
			      struct netlink_ext_ack *extack)
{
	int err;

	switch (enc_ports->dst) {
	case htons(IANA_VXLAN_UDP_PORT):
		*tun_type = NFP_FL_TUNNEL_VXLAN;
		*key_layer |= NFP_FLOWER_LAYER_VXLAN;

		if (ipv6) {
			*key_layer |= NFP_FLOWER_LAYER_EXT_META;
			*key_size += sizeof(struct nfp_flower_ext_meta);
			*key_layer_two |= NFP_FLOWER_LAYER2_TUN_IPV6;
			*key_size += sizeof(struct nfp_flower_ipv6_udp_tun);
		} else {
			*key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
		}

		if (enc_op) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: encap options not supported on vxlan tunnels");
			return -EOPNOTSUPP;
		}
		break;
	case htons(GENEVE_UDP_PORT):
		if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE)) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support geneve offload");
			return -EOPNOTSUPP;
		}
		*tun_type = NFP_FL_TUNNEL_GENEVE;
		*key_layer |= NFP_FLOWER_LAYER_EXT_META;
		*key_size += sizeof(struct nfp_flower_ext_meta);
		*key_layer_two |= NFP_FLOWER_LAYER2_GENEVE;

		if (ipv6) {
			*key_layer_two |= NFP_FLOWER_LAYER2_TUN_IPV6;
			*key_size += sizeof(struct nfp_flower_ipv6_udp_tun);
		} else {
			*key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
		}

		if (!enc_op)
			break;
		if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE_OPT)) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support geneve option offload");
			return -EOPNOTSUPP;
		}
		err = nfp_flower_calc_opt_layer(enc_op, key_layer_two, key_size,
						ipv6, extack);
		if (err)
			return err;
		break;
	default:
		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel type unknown");
		return -EOPNOTSUPP;
	}

	return 0;
}

int
nfp_flower_calculate_key_layers(struct nfp_app *app,
				struct net_device *netdev,
				struct nfp_fl_key_ls *ret_key_ls,
				struct flow_rule *rule,
				enum nfp_flower_tun_type *tun_type,
				struct netlink_ext_ack *extack)
{
	struct flow_dissector *dissector = rule->match.dissector;
	struct flow_match_basic basic = { NULL, NULL};
	struct nfp_flower_priv *priv = app->priv;
	u32 key_layer_two;
	u8 key_layer;
	int key_size;
	int err;

	if (dissector->used_keys & ~NFP_FLOWER_WHITELIST_DISSECTOR) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match not supported");
		return -EOPNOTSUPP;
	}

	/* If any tun dissector is used then the required set must be used. */
	if (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR &&
	    (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_V6_R)
	    != NFP_FLOWER_WHITELIST_TUN_DISSECTOR_V6_R &&
	    (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
	    != NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel match not supported");
		return -EOPNOTSUPP;
	}

	key_layer_two = 0;
	key_layer = NFP_FLOWER_LAYER_PORT;
	key_size = sizeof(struct nfp_flower_meta_tci) +
		   sizeof(struct nfp_flower_in_port);

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS) ||
	    flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_MPLS)) {
		key_layer |= NFP_FLOWER_LAYER_MAC;
		key_size += sizeof(struct nfp_flower_mac_mpls);
	}

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
		struct flow_match_vlan vlan;

		flow_rule_match_vlan(rule, &vlan);
		if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_PCP) &&
		    vlan.key->vlan_priority) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support VLAN PCP offload");
			return -EOPNOTSUPP;
		}
		if (priv->flower_ext_feats & NFP_FL_FEATS_VLAN_QINQ &&
		    !(key_layer_two & NFP_FLOWER_LAYER2_QINQ)) {
			key_layer |= NFP_FLOWER_LAYER_EXT_META;
			key_size += sizeof(struct nfp_flower_ext_meta);
			key_size += sizeof(struct nfp_flower_vlan);
			key_layer_two |= NFP_FLOWER_LAYER2_QINQ;
		}
	}

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CVLAN)) {
		struct flow_match_vlan cvlan;

		if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_QINQ)) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support VLAN QinQ offload");
			return -EOPNOTSUPP;
		}

		flow_rule_match_vlan(rule, &cvlan);
		if (!(key_layer_two & NFP_FLOWER_LAYER2_QINQ)) {
			key_layer |= NFP_FLOWER_LAYER_EXT_META;
			key_size += sizeof(struct nfp_flower_ext_meta);
			key_size += sizeof(struct nfp_flower_vlan);
			key_layer_two |= NFP_FLOWER_LAYER2_QINQ;
		}
	}

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
		struct flow_match_enc_opts enc_op = { NULL, NULL };
		struct flow_match_ipv4_addrs ipv4_addrs;
		struct flow_match_ipv6_addrs ipv6_addrs;
		struct flow_match_control enc_ctl;
		struct flow_match_ports enc_ports;
		bool ipv6_tun = false;

		flow_rule_match_enc_control(rule, &enc_ctl);

		if (enc_ctl.mask->addr_type != 0xffff) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: wildcarded protocols on tunnels are not supported");
			return -EOPNOTSUPP;
		}

		ipv6_tun = enc_ctl.key->addr_type ==
				FLOW_DISSECTOR_KEY_IPV6_ADDRS;
		if (ipv6_tun &&
		    !(priv->flower_ext_feats & NFP_FL_FEATS_IPV6_TUN)) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: firmware does not support IPv6 tunnels");
			return -EOPNOTSUPP;
		}

		if (!ipv6_tun &&
		    enc_ctl.key->addr_type != FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel address type not IPv4 or IPv6");
			return -EOPNOTSUPP;
		}

		if (ipv6_tun) {
			flow_rule_match_enc_ipv6_addrs(rule, &ipv6_addrs);
			if (memchr_inv(&ipv6_addrs.mask->dst, 0xff,
				       sizeof(ipv6_addrs.mask->dst))) {
				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match IPv6 destination address is supported");
				return -EOPNOTSUPP;
			}
		} else {
			flow_rule_match_enc_ipv4_addrs(rule, &ipv4_addrs);
			if (ipv4_addrs.mask->dst != cpu_to_be32(~0)) {
				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match IPv4 destination address is supported");
				return -EOPNOTSUPP;
			}
		}

		if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_OPTS))
			flow_rule_match_enc_opts(rule, &enc_op);

		if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
			/* check if GRE, which has no enc_ports */
			if (!netif_is_gretap(netdev) && !netif_is_ip6gretap(netdev)) {
				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: an exact match on L4 destination port is required for non-GRE tunnels");
				return -EOPNOTSUPP;
			}

			*tun_type = NFP_FL_TUNNEL_GRE;
			key_layer |= NFP_FLOWER_LAYER_EXT_META;
			key_size += sizeof(struct nfp_flower_ext_meta);
			key_layer_two |= NFP_FLOWER_LAYER2_GRE;

			if (ipv6_tun) {
				key_layer_two |= NFP_FLOWER_LAYER2_TUN_IPV6;
				key_size +=
					sizeof(struct nfp_flower_ipv6_udp_tun);
			} else {
				key_size +=
					sizeof(struct nfp_flower_ipv4_udp_tun);
			}

			if (enc_op.key) {
				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: encap options not supported on GRE tunnels");
				return -EOPNOTSUPP;
			}
		} else {
			flow_rule_match_enc_ports(rule, &enc_ports);
			if (enc_ports.mask->dst != cpu_to_be16(~0)) {
				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match L4 destination port is supported");
				return -EOPNOTSUPP;
			}

			err = nfp_flower_calc_udp_tun_layer(enc_ports.key,
							    enc_op.key,
							    &key_layer_two,
							    &key_layer,
							    &key_size, priv,
							    tun_type, ipv6_tun,
							    extack);
			if (err)
				return err;

			/* Ensure the ingress netdev matches the expected
			 * tun type.
			 */
			if (!nfp_fl_netdev_is_tunnel_type(netdev, *tun_type)) {
				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: ingress netdev does not match the expected tunnel type");
				return -EOPNOTSUPP;
			}
		}
	}

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC))
		flow_rule_match_basic(rule, &basic);

	if (basic.mask && basic.mask->n_proto) {
		/* Ethernet type is present in the key. */
		switch (basic.key->n_proto) {
		case cpu_to_be16(ETH_P_IP):
			key_layer |= NFP_FLOWER_LAYER_IPV4;
			key_size += sizeof(struct nfp_flower_ipv4);
			break;

		case cpu_to_be16(ETH_P_IPV6):
			key_layer |= NFP_FLOWER_LAYER_IPV6;
			key_size += sizeof(struct nfp_flower_ipv6);
			break;

		/* Currently we do not offload ARP
		 * because we rely on it to get to the host.
		 */
		case cpu_to_be16(ETH_P_ARP):
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: ARP not supported");
			return -EOPNOTSUPP;

		case cpu_to_be16(ETH_P_MPLS_UC):
		case cpu_to_be16(ETH_P_MPLS_MC):
			if (!(key_layer & NFP_FLOWER_LAYER_MAC)) {
				key_layer |= NFP_FLOWER_LAYER_MAC;
				key_size += sizeof(struct nfp_flower_mac_mpls);
			}
			break;

		/* Will be included in layer 2. */
		case cpu_to_be16(ETH_P_8021Q):
			break;

		default:
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on given EtherType is not supported");
			return -EOPNOTSUPP;
		}
	} else if (nfp_flower_check_higher_than_mac(rule)) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: cannot match above L2 without specified EtherType");
		return -EOPNOTSUPP;
	}

	if (basic.mask && basic.mask->ip_proto) {
		switch (basic.key->ip_proto) {
		case IPPROTO_TCP:
		case IPPROTO_UDP:
		case IPPROTO_SCTP:
		case IPPROTO_ICMP:
		case IPPROTO_ICMPV6:
			key_layer |= NFP_FLOWER_LAYER_TP;
			key_size += sizeof(struct nfp_flower_tp_ports);
			break;
		}
	}

	if (!(key_layer & NFP_FLOWER_LAYER_TP) &&
	    nfp_flower_check_higher_than_l3(rule)) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: cannot match on L4 information without specified IP protocol type");
		return -EOPNOTSUPP;
	}

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_TCP)) {
		struct flow_match_tcp tcp;
		u32 tcp_flags;

		flow_rule_match_tcp(rule, &tcp);
		tcp_flags = be16_to_cpu(tcp.key->flags);

		if (tcp_flags & ~NFP_FLOWER_SUPPORTED_TCPFLAGS) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: no match support for selected TCP flags");
			return -EOPNOTSUPP;
		}

		/* We only support PSH and URG flags when either
		 * FIN, SYN or RST is present as well.
		 */
		if ((tcp_flags & (TCPHDR_PSH | TCPHDR_URG)) &&
		    !(tcp_flags & (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST))) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: PSH and URG is only supported when used with FIN, SYN or RST");
			return -EOPNOTSUPP;
		}

		/* We need to store TCP flags in the either the IPv4 or IPv6 key
		 * space, thus we need to ensure we include a IPv4/IPv6 key
		 * layer if we have not done so already.
		 */
		if (!basic.key) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on TCP flags requires a match on L3 protocol");
			return -EOPNOTSUPP;
		}

		if (!(key_layer & NFP_FLOWER_LAYER_IPV4) &&
		    !(key_layer & NFP_FLOWER_LAYER_IPV6)) {
			switch (basic.key->n_proto) {
			case cpu_to_be16(ETH_P_IP):
				key_layer |= NFP_FLOWER_LAYER_IPV4;
				key_size += sizeof(struct nfp_flower_ipv4);
				break;

			case cpu_to_be16(ETH_P_IPV6):
					key_layer |= NFP_FLOWER_LAYER_IPV6;
				key_size += sizeof(struct nfp_flower_ipv6);
				break;

			default:
				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on TCP flags requires a match on IPv4/IPv6");
				return -EOPNOTSUPP;
			}
		}
	}

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
		struct flow_match_control ctl;

		flow_rule_match_control(rule, &ctl);
		if (ctl.key->flags & ~NFP_FLOWER_SUPPORTED_CTLFLAGS) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on unknown control flag");
			return -EOPNOTSUPP;
		}
	}

	ret_key_ls->key_layer = key_layer;
	ret_key_ls->key_layer_two = key_layer_two;
	ret_key_ls->key_size = key_size;

	return 0;
}

struct nfp_fl_payload *
nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer)
{
	struct nfp_fl_payload *flow_pay;

	flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL);
	if (!flow_pay)
		return NULL;

	flow_pay->meta.key_len = key_layer->key_size;
	flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL);
	if (!flow_pay->unmasked_data)
		goto err_free_flow;

	flow_pay->meta.mask_len = key_layer->key_size;
	flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL);
	if (!flow_pay->mask_data)
		goto err_free_unmasked;

	flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
	if (!flow_pay->action_data)
		goto err_free_mask;

	flow_pay->nfp_tun_ipv4_addr = 0;
	flow_pay->nfp_tun_ipv6 = NULL;
	flow_pay->meta.flags = 0;
	INIT_LIST_HEAD(&flow_pay->linked_flows);
	flow_pay->in_hw = false;
	flow_pay->pre_tun_rule.dev = NULL;

	return flow_pay;

err_free_mask:
	kfree(flow_pay->mask_data);
err_free_unmasked:
	kfree(flow_pay->unmasked_data);
err_free_flow:
	kfree(flow_pay);
	return NULL;
}

static int
nfp_flower_update_merge_with_actions(struct nfp_fl_payload *flow,
				     struct nfp_flower_merge_check *merge,
				     u8 *last_act_id, int *act_out)
{
	struct nfp_fl_set_ipv6_tc_hl_fl *ipv6_tc_hl_fl;
	struct nfp_fl_set_ip4_ttl_tos *ipv4_ttl_tos;
	struct nfp_fl_set_ip4_addrs *ipv4_add;
	struct nfp_fl_set_ipv6_addr *ipv6_add;
	struct nfp_fl_push_vlan *push_vlan;
	struct nfp_fl_pre_tunnel *pre_tun;
	struct nfp_fl_set_tport *tport;
	struct nfp_fl_set_eth *eth;
	struct nfp_fl_act_head *a;
	unsigned int act_off = 0;
	bool ipv6_tun = false;
	u8 act_id = 0;
	u8 *ports;
	int i;

	while (act_off < flow->meta.act_len) {
		a = (struct nfp_fl_act_head *)&flow->action_data[act_off];
		act_id = a->jump_id;

		switch (act_id) {
		case NFP_FL_ACTION_OPCODE_OUTPUT:
			if (act_out)
				(*act_out)++;
			break;
		case NFP_FL_ACTION_OPCODE_PUSH_VLAN:
			push_vlan = (struct nfp_fl_push_vlan *)a;
			if (push_vlan->vlan_tci)
				merge->tci = cpu_to_be16(0xffff);
			break;
		case NFP_FL_ACTION_OPCODE_POP_VLAN:
			merge->tci = cpu_to_be16(0);
			break;
		case NFP_FL_ACTION_OPCODE_SET_TUNNEL:
			/* New tunnel header means l2 to l4 can be matched. */
			eth_broadcast_addr(&merge->l2.mac_dst[0]);
			eth_broadcast_addr(&merge->l2.mac_src[0]);
			memset(&merge->l4, 0xff,
			       sizeof(struct nfp_flower_tp_ports));
			if (ipv6_tun)
				memset(&merge->ipv6, 0xff,
				       sizeof(struct nfp_flower_ipv6));
			else
				memset(&merge->ipv4, 0xff,
				       sizeof(struct nfp_flower_ipv4));
			break;
		case NFP_FL_ACTION_OPCODE_SET_ETHERNET:
			eth = (struct nfp_fl_set_eth *)a;
			for (i = 0; i < ETH_ALEN; i++)
				merge->l2.mac_dst[i] |= eth->eth_addr_mask[i];
			for (i = 0; i < ETH_ALEN; i++)
				merge->l2.mac_src[i] |=
					eth->eth_addr_mask[ETH_ALEN + i];
			break;
		case NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS:
			ipv4_add = (struct nfp_fl_set_ip4_addrs *)a;
			merge->ipv4.ipv4_src |= ipv4_add->ipv4_src_mask;
			merge->ipv4.ipv4_dst |= ipv4_add->ipv4_dst_mask;
			break;
		case NFP_FL_ACTION_OPCODE_SET_IPV4_TTL_TOS:
			ipv4_ttl_tos = (struct nfp_fl_set_ip4_ttl_tos *)a;
			merge->ipv4.ip_ext.ttl |= ipv4_ttl_tos->ipv4_ttl_mask;
			merge->ipv4.ip_ext.tos |= ipv4_ttl_tos->ipv4_tos_mask;
			break;
		case NFP_FL_ACTION_OPCODE_SET_IPV6_SRC:
			ipv6_add = (struct nfp_fl_set_ipv6_addr *)a;
			for (i = 0; i < 4; i++)
				merge->ipv6.ipv6_src.in6_u.u6_addr32[i] |=
					ipv6_add->ipv6[i].mask;
			break;
		case NFP_FL_ACTION_OPCODE_SET_IPV6_DST:
			ipv6_add = (struct nfp_fl_set_ipv6_addr *)a;
			for (i = 0; i < 4; i++)
				merge->ipv6.ipv6_dst.in6_u.u6_addr32[i] |=
					ipv6_add->ipv6[i].mask;
			break;
		case NFP_FL_ACTION_OPCODE_SET_IPV6_TC_HL_FL:
			ipv6_tc_hl_fl = (struct nfp_fl_set_ipv6_tc_hl_fl *)a;
			merge->ipv6.ip_ext.ttl |=
				ipv6_tc_hl_fl->ipv6_hop_limit_mask;
			merge->ipv6.ip_ext.tos |= ipv6_tc_hl_fl->ipv6_tc_mask;
			merge->ipv6.ipv6_flow_label_exthdr |=
				ipv6_tc_hl_fl->ipv6_label_mask;
			break;
		case NFP_FL_ACTION_OPCODE_SET_UDP:
		case NFP_FL_ACTION_OPCODE_SET_TCP:
			tport = (struct nfp_fl_set_tport *)a;
			ports = (u8 *)&merge->l4.port_src;
			for (i = 0; i < 4; i++)
				ports[i] |= tport->tp_port_mask[i];
			break;
		case NFP_FL_ACTION_OPCODE_PRE_TUNNEL:
			pre_tun = (struct nfp_fl_pre_tunnel *)a;
			ipv6_tun = be16_to_cpu(pre_tun->flags) &
					NFP_FL_PRE_TUN_IPV6;
			break;
		case NFP_FL_ACTION_OPCODE_PRE_LAG:
		case NFP_FL_ACTION_OPCODE_PUSH_GENEVE:
			break;
		default:
			return -EOPNOTSUPP;
		}

		act_off += a->len_lw << NFP_FL_LW_SIZ;
	}

	if (last_act_id)
		*last_act_id = act_id;

	return 0;
}

static int
nfp_flower_populate_merge_match(struct nfp_fl_payload *flow,
				struct nfp_flower_merge_check *merge,
				bool extra_fields)
{
	struct nfp_flower_meta_tci *meta_tci;
	u8 *mask = flow->mask_data;
	u8 key_layer, match_size;

	memset(merge, 0, sizeof(struct nfp_flower_merge_check));

	meta_tci = (struct nfp_flower_meta_tci *)mask;
	key_layer = meta_tci->nfp_flow_key_layer;

	if (key_layer & ~NFP_FLOWER_MERGE_FIELDS && !extra_fields)
		return -EOPNOTSUPP;

	merge->tci = meta_tci->tci;
	mask += sizeof(struct nfp_flower_meta_tci);

	if (key_layer & NFP_FLOWER_LAYER_EXT_META)
		mask += sizeof(struct nfp_flower_ext_meta);

	mask += sizeof(struct nfp_flower_in_port);

	if (key_layer & NFP_FLOWER_LAYER_MAC) {
		match_size = sizeof(struct nfp_flower_mac_mpls);
		memcpy(&merge->l2, mask, match_size);
		mask += match_size;
	}

	if (key_layer & NFP_FLOWER_LAYER_TP) {
		match_size = sizeof(struct nfp_flower_tp_ports);
		memcpy(&merge->l4, mask, match_size);
		mask += match_size;
	}

	if (key_layer & NFP_FLOWER_LAYER_IPV4) {
		match_size = sizeof(struct nfp_flower_ipv4);
		memcpy(&merge->ipv4, mask, match_size);
	}

	if (key_layer & NFP_FLOWER_LAYER_IPV6) {
		match_size = sizeof(struct nfp_flower_ipv6);
		memcpy(&merge->ipv6, mask, match_size);
	}

	return 0;
}

static int
nfp_flower_can_merge(struct nfp_fl_payload *sub_flow1,
		     struct nfp_fl_payload *sub_flow2)
{
	/* Two flows can be merged if sub_flow2 only matches on bits that are
	 * either matched by sub_flow1 or set by a sub_flow1 action. This
	 * ensures that every packet that hits sub_flow1 and recirculates is
	 * guaranteed to hit sub_flow2.
	 */
	struct nfp_flower_merge_check sub_flow1_merge, sub_flow2_merge;
	int err, act_out = 0;
	u8 last_act_id = 0;

	err = nfp_flower_populate_merge_match(sub_flow1, &sub_flow1_merge,
					      true);
	if (err)
		return err;

	err = nfp_flower_populate_merge_match(sub_flow2, &sub_flow2_merge,
					      false);
	if (err)
		return err;

	err = nfp_flower_update_merge_with_actions(sub_flow1, &sub_flow1_merge,
						   &last_act_id, &act_out);
	if (err)
		return err;

	/* Must only be 1 output action and it must be the last in sequence. */
	if (act_out != 1 || last_act_id != NFP_FL_ACTION_OPCODE_OUTPUT)
		return -EOPNOTSUPP;

	/* Reject merge if sub_flow2 matches on something that is not matched
	 * on or set in an action by sub_flow1.
	 */
	err = bitmap_andnot(sub_flow2_merge.vals, sub_flow2_merge.vals,
			    sub_flow1_merge.vals,
			    sizeof(struct nfp_flower_merge_check) * 8);
	if (err)
		return -EINVAL;

	return 0;
}

static unsigned int
nfp_flower_copy_pre_actions(char *act_dst, char *act_src, int len,
			    bool *tunnel_act)
{
	unsigned int act_off = 0, act_len;
	struct nfp_fl_act_head *a;
	u8 act_id = 0;

	while (act_off < len) {
		a = (struct nfp_fl_act_head *)&act_src[act_off];
		act_len = a->len_lw << NFP_FL_LW_SIZ;
		act_id = a->jump_id;

		switch (act_id) {
		case NFP_FL_ACTION_OPCODE_PRE_TUNNEL:
			if (tunnel_act)
				*tunnel_act = true;
			fallthrough;
		case NFP_FL_ACTION_OPCODE_PRE_LAG:
			memcpy(act_dst + act_off, act_src + act_off, act_len);
			break;
		default:
			return act_off;
		}

		act_off += act_len;
	}

	return act_off;
}

static int
nfp_fl_verify_post_tun_acts(char *acts, int len, struct nfp_fl_push_vlan **vlan)
{
	struct nfp_fl_act_head *a;
	unsigned int act_off = 0;

	while (act_off < len) {
		a = (struct nfp_fl_act_head *)&acts[act_off];

		if (a->jump_id == NFP_FL_ACTION_OPCODE_PUSH_VLAN && !act_off)
			*vlan = (struct nfp_fl_push_vlan *)a;
		else if (a->jump_id != NFP_FL_ACTION_OPCODE_OUTPUT)
			return -EOPNOTSUPP;

		act_off += a->len_lw << NFP_FL_LW_SIZ;
	}

	/* Ensure any VLAN push also has an egress action. */
	if (*vlan && act_off <= sizeof(struct nfp_fl_push_vlan))
		return -EOPNOTSUPP;

	return 0;
}

static int
nfp_fl_push_vlan_after_tun(char *acts, int len, struct nfp_fl_push_vlan *vlan)
{
	struct nfp_fl_set_tun *tun;
	struct nfp_fl_act_head *a;
	unsigned int act_off = 0;

	while (act_off < len) {
		a = (struct nfp_fl_act_head *)&acts[act_off];

		if (a->jump_id == NFP_FL_ACTION_OPCODE_SET_TUNNEL) {
			tun = (struct nfp_fl_set_tun *)a;
			tun->outer_vlan_tpid = vlan->vlan_tpid;
			tun->outer_vlan_tci = vlan->vlan_tci;

			return 0;
		}

		act_off += a->len_lw << NFP_FL_LW_SIZ;
	}

	/* Return error if no tunnel action is found. */
	return -EOPNOTSUPP;
}

static int
nfp_flower_merge_action(struct nfp_fl_payload *sub_flow1,
			struct nfp_fl_payload *sub_flow2,
			struct nfp_fl_payload *merge_flow)
{
	unsigned int sub1_act_len, sub2_act_len, pre_off1, pre_off2;
	struct nfp_fl_push_vlan *post_tun_push_vlan = NULL;
	bool tunnel_act = false;
	char *merge_act;
	int err;

	/* The last action of sub_flow1 must be output - do not merge this. */
	sub1_act_len = sub_flow1->meta.act_len - sizeof(struct nfp_fl_output);
	sub2_act_len = sub_flow2->meta.act_len;

	if (!sub2_act_len)
		return -EINVAL;

	if (sub1_act_len + sub2_act_len > NFP_FL_MAX_A_SIZ)
		return -EINVAL;

	/* A shortcut can only be applied if there is a single action. */
	if (sub1_act_len)
		merge_flow->meta.shortcut = cpu_to_be32(NFP_FL_SC_ACT_NULL);
	else
		merge_flow->meta.shortcut = sub_flow2->meta.shortcut;

	merge_flow->meta.act_len = sub1_act_len + sub2_act_len;
	merge_act = merge_flow->action_data;

	/* Copy any pre-actions to the start of merge flow action list. */
	pre_off1 = nfp_flower_copy_pre_actions(merge_act,
					       sub_flow1->action_data,
					       sub1_act_len, &tunnel_act);
	merge_act += pre_off1;
	sub1_act_len -= pre_off1;
	pre_off2 = nfp_flower_copy_pre_actions(merge_act,
					       sub_flow2->action_data,
					       sub2_act_len, NULL);
	merge_act += pre_off2;
	sub2_act_len -= pre_off2;

	/* FW does a tunnel push when egressing, therefore, if sub_flow 1 pushes
	 * a tunnel, there are restrictions on what sub_flow 2 actions lead to a
	 * valid merge.
	 */
	if (tunnel_act) {
		char *post_tun_acts = &sub_flow2->action_data[pre_off2];

		err = nfp_fl_verify_post_tun_acts(post_tun_acts, sub2_act_len,
						  &post_tun_push_vlan);
		if (err)
			return err;

		if (post_tun_push_vlan) {
			pre_off2 += sizeof(*post_tun_push_vlan);
			sub2_act_len -= sizeof(*post_tun_push_vlan);
		}
	}

	/* Copy remaining actions from sub_flows 1 and 2. */
	memcpy(merge_act, sub_flow1->action_data + pre_off1, sub1_act_len);

	if (post_tun_push_vlan) {
		/* Update tunnel action in merge to include VLAN push. */
		err = nfp_fl_push_vlan_after_tun(merge_act, sub1_act_len,
						 post_tun_push_vlan);
		if (err)
			return err;

		merge_flow->meta.act_len -= sizeof(*post_tun_push_vlan);
	}

	merge_act += sub1_act_len;
	memcpy(merge_act, sub_flow2->action_data + pre_off2, sub2_act_len);

	return 0;
}

/* Flow link code should only be accessed under RTNL. */
static void nfp_flower_unlink_flow(struct nfp_fl_payload_link *link)
{
	list_del(&link->merge_flow.list);
	list_del(&link->sub_flow.list);
	kfree(link);
}

static void nfp_flower_unlink_flows(struct nfp_fl_payload *merge_flow,
				    struct nfp_fl_payload *sub_flow)
{
	struct nfp_fl_payload_link *link;

	list_for_each_entry(link, &merge_flow->linked_flows, merge_flow.list)
		if (link->sub_flow.flow == sub_flow) {
			nfp_flower_unlink_flow(link);
			return;
		}
}

static int nfp_flower_link_flows(struct nfp_fl_payload *merge_flow,
				 struct nfp_fl_payload *sub_flow)
{
	struct nfp_fl_payload_link *link;

	link = kmalloc(sizeof(*link), GFP_KERNEL);
	if (!link)
		return -ENOMEM;

	link->merge_flow.flow = merge_flow;
	list_add_tail(&link->merge_flow.list, &merge_flow->linked_flows);
	link->sub_flow.flow = sub_flow;
	list_add_tail(&link->sub_flow.list, &sub_flow->linked_flows);

	return 0;
}

/**
 * nfp_flower_merge_offloaded_flows() - Merge 2 existing flows to single flow.
 * @app:	Pointer to the APP handle
 * @sub_flow1:	Initial flow matched to produce merge hint
 * @sub_flow2:	Post recirculation flow matched in merge hint
 *
 * Combines 2 flows (if valid) to a single flow, removing the initial from hw
 * and offloading the new, merged flow.
 *
 * Return: negative value on error, 0 in success.
 */
int nfp_flower_merge_offloaded_flows(struct nfp_app *app,
				     struct nfp_fl_payload *sub_flow1,
				     struct nfp_fl_payload *sub_flow2)
{
	struct nfp_flower_priv *priv = app->priv;
	struct nfp_fl_payload *merge_flow;
	struct nfp_fl_key_ls merge_key_ls;
	struct nfp_merge_info *merge_info;
	u64 parent_ctx = 0;
	int err;

	ASSERT_RTNL();

	if (sub_flow1 == sub_flow2 ||
	    nfp_flower_is_merge_flow(sub_flow1) ||
	    nfp_flower_is_merge_flow(sub_flow2))
		return -EINVAL;

	/* check if the two flows are already merged */
	parent_ctx = (u64)(be32_to_cpu(sub_flow1->meta.host_ctx_id)) << 32;
	parent_ctx |= (u64)(be32_to_cpu(sub_flow2->meta.host_ctx_id));
	if (rhashtable_lookup_fast(&priv->merge_table,
				   &parent_ctx, merge_table_params)) {
		nfp_flower_cmsg_warn(app, "The two flows are already merged.\n");
		return 0;
	}

	err = nfp_flower_can_merge(sub_flow1, sub_flow2);
	if (err)
		return err;

	merge_key_ls.key_size = sub_flow1->meta.key_len;

	merge_flow = nfp_flower_allocate_new(&merge_key_ls);
	if (!merge_flow)
		return -ENOMEM;

	merge_flow->tc_flower_cookie = (unsigned long)merge_flow;
	merge_flow->ingress_dev = sub_flow1->ingress_dev;

	memcpy(merge_flow->unmasked_data, sub_flow1->unmasked_data,
	       sub_flow1->meta.key_len);
	memcpy(merge_flow->mask_data, sub_flow1->mask_data,
	       sub_flow1->meta.mask_len);

	err = nfp_flower_merge_action(sub_flow1, sub_flow2, merge_flow);
	if (err)
		goto err_destroy_merge_flow;

	err = nfp_flower_link_flows(merge_flow, sub_flow1);
	if (err)
		goto err_destroy_merge_flow;

	err = nfp_flower_link_flows(merge_flow, sub_flow2);
	if (err)
		goto err_unlink_sub_flow1;

	err = nfp_compile_flow_metadata(app, merge_flow->tc_flower_cookie, merge_flow,
					merge_flow->ingress_dev, NULL);
	if (err)
		goto err_unlink_sub_flow2;

	err = rhashtable_insert_fast(&priv->flow_table, &merge_flow->fl_node,
				     nfp_flower_table_params);
	if (err)
		goto err_release_metadata;

	merge_info = kmalloc(sizeof(*merge_info), GFP_KERNEL);
	if (!merge_info) {
		err = -ENOMEM;
		goto err_remove_rhash;
	}
	merge_info->parent_ctx = parent_ctx;
	err = rhashtable_insert_fast(&priv->merge_table, &merge_info->ht_node,
				     merge_table_params);
	if (err)
		goto err_destroy_merge_info;

	err = nfp_flower_xmit_flow(app, merge_flow,
				   NFP_FLOWER_CMSG_TYPE_FLOW_MOD);
	if (err)
		goto err_remove_merge_info;

	merge_flow->in_hw = true;
	sub_flow1->in_hw = false;

	return 0;

err_remove_merge_info:
	WARN_ON_ONCE(rhashtable_remove_fast(&priv->merge_table,
					    &merge_info->ht_node,
					    merge_table_params));
err_destroy_merge_info:
	kfree(merge_info);
err_remove_rhash:
	WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
					    &merge_flow->fl_node,
					    nfp_flower_table_params));
err_release_metadata:
	nfp_modify_flow_metadata(app, merge_flow);
err_unlink_sub_flow2:
	nfp_flower_unlink_flows(merge_flow, sub_flow2);
err_unlink_sub_flow1:
	nfp_flower_unlink_flows(merge_flow, sub_flow1);
err_destroy_merge_flow:
	kfree(merge_flow->action_data);
	kfree(merge_flow->mask_data);
	kfree(merge_flow->unmasked_data);
	kfree(merge_flow);
	return err;
}

/**
 * nfp_flower_validate_pre_tun_rule()
 * @app:	Pointer to the APP handle
 * @flow:	Pointer to NFP flow representation of rule
 * @key_ls:	Pointer to NFP key layers structure
 * @extack:	Netlink extended ACK report
 *
 * Verifies the flow as a pre-tunnel rule.
 *
 * Return: negative value on error, 0 if verified.
 */
static int
nfp_flower_validate_pre_tun_rule(struct nfp_app *app,
				 struct nfp_fl_payload *flow,
				 struct nfp_fl_key_ls *key_ls,
				 struct netlink_ext_ack *extack)
{
	struct nfp_flower_priv *priv = app->priv;
	struct nfp_flower_meta_tci *meta_tci;
	struct nfp_flower_mac_mpls *mac;
	u8 *ext = flow->unmasked_data;
	struct nfp_fl_act_head *act;
	u8 *mask = flow->mask_data;
	bool vlan = false;
	int act_offset;
	u8 key_layer;

	meta_tci = (struct nfp_flower_meta_tci *)flow->unmasked_data;
	key_layer = key_ls->key_layer;
	if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_QINQ)) {
		if (meta_tci->tci & cpu_to_be16(NFP_FLOWER_MASK_VLAN_PRESENT)) {
			u16 vlan_tci = be16_to_cpu(meta_tci->tci);

			vlan_tci &= ~NFP_FLOWER_MASK_VLAN_PRESENT;
			flow->pre_tun_rule.vlan_tci = cpu_to_be16(vlan_tci);
			vlan = true;
		} else {
			flow->pre_tun_rule.vlan_tci = cpu_to_be16(0xffff);
		}
	}

	if (key_layer & ~NFP_FLOWER_PRE_TUN_RULE_FIELDS) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: too many match fields");
		return -EOPNOTSUPP;
	} else if (key_ls->key_layer_two & ~NFP_FLOWER_LAYER2_QINQ) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: non-vlan in extended match fields");
		return -EOPNOTSUPP;
	}

	if (!(key_layer & NFP_FLOWER_LAYER_MAC)) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: MAC fields match required");
		return -EOPNOTSUPP;
	}

	if (!(key_layer & NFP_FLOWER_LAYER_IPV4) &&
	    !(key_layer & NFP_FLOWER_LAYER_IPV6)) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: match on ipv4/ipv6 eth_type must be present");
		return -EOPNOTSUPP;
	}

	if (key_layer & NFP_FLOWER_LAYER_IPV6)
		flow->pre_tun_rule.is_ipv6 = true;
	else
		flow->pre_tun_rule.is_ipv6 = false;

	/* Skip fields known to exist. */
	mask += sizeof(struct nfp_flower_meta_tci);
	ext += sizeof(struct nfp_flower_meta_tci);
	if (key_ls->key_layer_two) {
		mask += sizeof(struct nfp_flower_ext_meta);
		ext += sizeof(struct nfp_flower_ext_meta);
	}
	mask += sizeof(struct nfp_flower_in_port);
	ext += sizeof(struct nfp_flower_in_port);

	/* Ensure destination MAC address is fully matched. */
	mac = (struct nfp_flower_mac_mpls *)mask;
	if (!is_broadcast_ether_addr(&mac->mac_dst[0])) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: dest MAC field must not be masked");
		return -EOPNOTSUPP;
	}

	/* Ensure source MAC address is fully matched. This is only needed
	 * for firmware with the DECAP_V2 feature enabled. Don't do this
	 * for firmware without this feature to keep old behaviour.
	 */
	if (priv->flower_ext_feats & NFP_FL_FEATS_DECAP_V2) {
		mac = (struct nfp_flower_mac_mpls *)mask;
		if (!is_broadcast_ether_addr(&mac->mac_src[0])) {
			NL_SET_ERR_MSG_MOD(extack,
					   "unsupported pre-tunnel rule: source MAC field must not be masked");
			return -EOPNOTSUPP;
		}
	}

	if (mac->mpls_lse) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: MPLS not supported");
		return -EOPNOTSUPP;
	}

	/* Ensure destination MAC address matches pre_tun_dev. */
	mac = (struct nfp_flower_mac_mpls *)ext;
	if (memcmp(&mac->mac_dst[0], flow->pre_tun_rule.dev->dev_addr, 6)) {
		NL_SET_ERR_MSG_MOD(extack,
				   "unsupported pre-tunnel rule: dest MAC must match output dev MAC");
		return -EOPNOTSUPP;
	}

	/* Save mac addresses in pre_tun_rule entry for later use */
	memcpy(&flow->pre_tun_rule.loc_mac, &mac->mac_dst[0], ETH_ALEN);
	memcpy(&flow->pre_tun_rule.rem_mac, &mac->mac_src[0], ETH_ALEN);

	mask += sizeof(struct nfp_flower_mac_mpls);
	ext += sizeof(struct nfp_flower_mac_mpls);
	if (key_layer & NFP_FLOWER_LAYER_IPV4 ||
	    key_layer & NFP_FLOWER_LAYER_IPV6) {
		/* Flags and proto fields have same offset in IPv4 and IPv6. */
		int ip_flags = offsetof(struct nfp_flower_ipv4, ip_ext.flags);
		int ip_proto = offsetof(struct nfp_flower_ipv4, ip_ext.proto);
		int size;
		int i;

		size = key_layer & NFP_FLOWER_LAYER_IPV4 ?
			sizeof(struct nfp_flower_ipv4) :
			sizeof(struct nfp_flower_ipv6);


		/* Ensure proto and flags are the only IP layer fields. */
		for (i = 0; i < size; i++)
			if (mask[i] && i != ip_flags && i != ip_proto) {
				NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: only flags and proto can be matched in ip header");
				return -EOPNOTSUPP;
			}
		ext += size;
		mask += size;
	}

	if ((priv->flower_ext_feats & NFP_FL_FEATS_VLAN_QINQ)) {
		if (key_ls->key_layer_two & NFP_FLOWER_LAYER2_QINQ) {
			struct nfp_flower_vlan *vlan_tags;
			u16 vlan_tpid;
			u16 vlan_tci;

			vlan_tags = (struct nfp_flower_vlan *)ext;

			vlan_tci = be16_to_cpu(vlan_tags->outer_tci);
			vlan_tpid = be16_to_cpu(vlan_tags->outer_tpid);

			vlan_tci &= ~NFP_FLOWER_MASK_VLAN_PRESENT;
			flow->pre_tun_rule.vlan_tci = cpu_to_be16(vlan_tci);
			flow->pre_tun_rule.vlan_tpid = cpu_to_be16(vlan_tpid);
			vlan = true;
		} else {
			flow->pre_tun_rule.vlan_tci = cpu_to_be16(0xffff);
			flow->pre_tun_rule.vlan_tpid = cpu_to_be16(0xffff);
		}
	}

	/* Action must be a single egress or pop_vlan and egress. */
	act_offset = 0;
	act = (struct nfp_fl_act_head *)&flow->action_data[act_offset];
	if (vlan) {
		if (act->jump_id != NFP_FL_ACTION_OPCODE_POP_VLAN) {
			NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: match on VLAN must have VLAN pop as first action");
			return -EOPNOTSUPP;
		}

		act_offset += act->len_lw << NFP_FL_LW_SIZ;
		act = (struct nfp_fl_act_head *)&flow->action_data[act_offset];
	}

	if (act->jump_id != NFP_FL_ACTION_OPCODE_OUTPUT) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: non egress action detected where egress was expected");
		return -EOPNOTSUPP;
	}

	act_offset += act->len_lw << NFP_FL_LW_SIZ;

	/* Ensure there are no more actions after egress. */
	if (act_offset != flow->meta.act_len) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported pre-tunnel rule: egress is not the last action");
		return -EOPNOTSUPP;
	}

	return 0;
}

static bool offload_pre_check(struct flow_cls_offload *flow)
{
	struct flow_rule *rule = flow_cls_offload_flow_rule(flow);
	struct flow_dissector *dissector = rule->match.dissector;

	if (dissector->used_keys & BIT(FLOW_DISSECTOR_KEY_CT))
		return false;

	if (flow->common.chain_index)
		return false;

	return true;
}

/**
 * nfp_flower_add_offload() - Adds a new flow to hardware.
 * @app:	Pointer to the APP handle
 * @netdev:	netdev structure.
 * @flow:	TC flower classifier offload structure.
 *
 * Adds a new flow to the repeated hash structure and action payload.
 *
 * Return: negative value on error, 0 if configured successfully.
 */
static int
nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
		       struct flow_cls_offload *flow)
{
	struct flow_rule *rule = flow_cls_offload_flow_rule(flow);
	enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
	struct nfp_flower_priv *priv = app->priv;
	struct netlink_ext_ack *extack = NULL;
	struct nfp_fl_payload *flow_pay;
	struct nfp_fl_key_ls *key_layer;
	struct nfp_port *port = NULL;
	int err;

	extack = flow->common.extack;
	if (nfp_netdev_is_nfp_repr(netdev))
		port = nfp_port_from_netdev(netdev);

	if (is_pre_ct_flow(flow))
		return nfp_fl_ct_handle_pre_ct(priv, netdev, flow, extack);

	if (is_post_ct_flow(flow))
		return nfp_fl_ct_handle_post_ct(priv, netdev, flow, extack);

	if (!offload_pre_check(flow))
		return -EOPNOTSUPP;

	key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
	if (!key_layer)
		return -ENOMEM;

	err = nfp_flower_calculate_key_layers(app, netdev, key_layer, rule,
					      &tun_type, extack);
	if (err)
		goto err_free_key_ls;

	flow_pay = nfp_flower_allocate_new(key_layer);
	if (!flow_pay) {
		err = -ENOMEM;
		goto err_free_key_ls;
	}

	err = nfp_flower_compile_flow_match(app, rule, key_layer, netdev,
					    flow_pay, tun_type, extack);
	if (err)
		goto err_destroy_flow;

	err = nfp_flower_compile_action(app, rule, netdev, flow_pay, extack);
	if (err)
		goto err_destroy_flow;

	if (flow_pay->pre_tun_rule.dev) {
		err = nfp_flower_validate_pre_tun_rule(app, flow_pay, key_layer, extack);
		if (err)
			goto err_destroy_flow;
	}

	err = nfp_compile_flow_metadata(app, flow->cookie, flow_pay, netdev, extack);
	if (err)
		goto err_destroy_flow;

	flow_pay->tc_flower_cookie = flow->cookie;
	err = rhashtable_insert_fast(&priv->flow_table, &flow_pay->fl_node,
				     nfp_flower_table_params);
	if (err) {
		NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot insert flow into tables for offloads");
		goto err_release_metadata;
	}

	if (flow_pay->pre_tun_rule.dev) {
		if (priv->flower_ext_feats & NFP_FL_FEATS_DECAP_V2) {
			struct nfp_predt_entry *predt;

			predt = kzalloc(sizeof(*predt), GFP_KERNEL);
			if (!predt) {
				err = -ENOMEM;
				goto err_remove_rhash;
			}
			predt->flow_pay = flow_pay;
			INIT_LIST_HEAD(&predt->nn_list);
			spin_lock_bh(&priv->predt_lock);
			list_add(&predt->list_head, &priv->predt_list);
			flow_pay->pre_tun_rule.predt = predt;
			nfp_tun_link_and_update_nn_entries(app, predt);
			spin_unlock_bh(&priv->predt_lock);
		} else {
			err = nfp_flower_xmit_pre_tun_flow(app, flow_pay);
		}
	} else {
		err = nfp_flower_xmit_flow(app, flow_pay,
					   NFP_FLOWER_CMSG_TYPE_FLOW_ADD);
	}

	if (err)
		goto err_remove_rhash;

	if (port)
		port->tc_offload_cnt++;

	flow_pay->in_hw = true;

	/* Deallocate flow payload when flower rule has been destroyed. */
	kfree(key_layer);

	return 0;

err_remove_rhash:
	WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
					    &flow_pay->fl_node,
					    nfp_flower_table_params));
err_release_metadata:
	nfp_modify_flow_metadata(app, flow_pay);
err_destroy_flow:
	if (flow_pay->nfp_tun_ipv6)
		nfp_tunnel_put_ipv6_off(app, flow_pay->nfp_tun_ipv6);
	kfree(flow_pay->action_data);
	kfree(flow_pay->mask_data);
	kfree(flow_pay->unmasked_data);
	kfree(flow_pay);
err_free_key_ls:
	kfree(key_layer);
	return err;
}

static void
nfp_flower_remove_merge_flow(struct nfp_app *app,
			     struct nfp_fl_payload *del_sub_flow,
			     struct nfp_fl_payload *merge_flow)
{
	struct nfp_flower_priv *priv = app->priv;
	struct nfp_fl_payload_link *link, *temp;
	struct nfp_merge_info *merge_info;
	struct nfp_fl_payload *origin;
	u64 parent_ctx = 0;
	bool mod = false;
	int err;

	link = list_first_entry(&merge_flow->linked_flows,
				struct nfp_fl_payload_link, merge_flow.list);
	origin = link->sub_flow.flow;

	/* Re-add rule the merge had overwritten if it has not been deleted. */
	if (origin != del_sub_flow)
		mod = true;

	err = nfp_modify_flow_metadata(app, merge_flow);
	if (err) {
		nfp_flower_cmsg_warn(app, "Metadata fail for merge flow delete.\n");
		goto err_free_links;
	}

	if (!mod) {
		err = nfp_flower_xmit_flow(app, merge_flow,
					   NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
		if (err) {
			nfp_flower_cmsg_warn(app, "Failed to delete merged flow.\n");
			goto err_free_links;
		}
	} else {
		__nfp_modify_flow_metadata(priv, origin);
		err = nfp_flower_xmit_flow(app, origin,
					   NFP_FLOWER_CMSG_TYPE_FLOW_MOD);
		if (err)
			nfp_flower_cmsg_warn(app, "Failed to revert merge flow.\n");
		origin->in_hw = true;
	}

err_free_links:
	/* Clean any links connected with the merged flow. */
	list_for_each_entry_safe(link, temp, &merge_flow->linked_flows,
				 merge_flow.list) {
		u32 ctx_id = be32_to_cpu(link->sub_flow.flow->meta.host_ctx_id);

		parent_ctx = (parent_ctx << 32) | (u64)(ctx_id);
		nfp_flower_unlink_flow(link);
	}

	merge_info = rhashtable_lookup_fast(&priv->merge_table,
					    &parent_ctx,
					    merge_table_params);
	if (merge_info) {
		WARN_ON_ONCE(rhashtable_remove_fast(&priv->merge_table,
						    &merge_info->ht_node,
						    merge_table_params));
		kfree(merge_info);
	}

	kfree(merge_flow->action_data);
	kfree(merge_flow->mask_data);
	kfree(merge_flow->unmasked_data);
	WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
					    &merge_flow->fl_node,
					    nfp_flower_table_params));
	kfree_rcu(merge_flow, rcu);
}

void
nfp_flower_del_linked_merge_flows(struct nfp_app *app,
				  struct nfp_fl_payload *sub_flow)
{
	struct nfp_fl_payload_link *link, *temp;

	/* Remove any merge flow formed from the deleted sub_flow. */
	list_for_each_entry_safe(link, temp, &sub_flow->linked_flows,
				 sub_flow.list)
		nfp_flower_remove_merge_flow(app, sub_flow,
					     link->merge_flow.flow);
}

/**
 * nfp_flower_del_offload() - Removes a flow from hardware.
 * @app:	Pointer to the APP handle
 * @netdev:	netdev structure.
 * @flow:	TC flower classifier offload structure
 *
 * Removes a flow from the repeated hash structure and clears the
 * action payload. Any flows merged from this are also deleted.
 *
 * Return: negative value on error, 0 if removed successfully.
 */
static int
nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
		       struct flow_cls_offload *flow)
{
	struct nfp_flower_priv *priv = app->priv;
	struct nfp_fl_ct_map_entry *ct_map_ent;
	struct netlink_ext_ack *extack = NULL;
	struct nfp_fl_payload *nfp_flow;
	struct nfp_port *port = NULL;
	int err;

	extack = flow->common.extack;
	if (nfp_netdev_is_nfp_repr(netdev))
		port = nfp_port_from_netdev(netdev);

	/* Check ct_map_table */
	ct_map_ent = rhashtable_lookup_fast(&priv->ct_map_table, &flow->cookie,
					    nfp_ct_map_params);
	if (ct_map_ent) {
		err = nfp_fl_ct_del_flow(ct_map_ent);
		return err;
	}

	nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
	if (!nfp_flow) {
		NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot remove flow that does not exist");
		return -ENOENT;
	}

	err = nfp_modify_flow_metadata(app, nfp_flow);
	if (err)
		goto err_free_merge_flow;

	if (nfp_flow->nfp_tun_ipv4_addr)
		nfp_tunnel_del_ipv4_off(app, nfp_flow->nfp_tun_ipv4_addr);

	if (nfp_flow->nfp_tun_ipv6)
		nfp_tunnel_put_ipv6_off(app, nfp_flow->nfp_tun_ipv6);

	if (!nfp_flow->in_hw) {
		err = 0;
		goto err_free_merge_flow;
	}

	if (nfp_flow->pre_tun_rule.dev) {
		if (priv->flower_ext_feats & NFP_FL_FEATS_DECAP_V2) {
			struct nfp_predt_entry *predt;

			predt = nfp_flow->pre_tun_rule.predt;
			if (predt) {
				spin_lock_bh(&priv->predt_lock);
				nfp_tun_unlink_and_update_nn_entries(app, predt);
				list_del(&predt->list_head);
				spin_unlock_bh(&priv->predt_lock);
				kfree(predt);
			}
		} else {
			err = nfp_flower_xmit_pre_tun_del_flow(app, nfp_flow);
		}
	} else {
		err = nfp_flower_xmit_flow(app, nfp_flow,
					   NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
	}
	/* Fall through on error. */

err_free_merge_flow:
	nfp_flower_del_linked_merge_flows(app, nfp_flow);
	if (port)
		port->tc_offload_cnt--;
	kfree(nfp_flow->action_data);
	kfree(nfp_flow->mask_data);
	kfree(nfp_flow->unmasked_data);
	WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
					    &nfp_flow->fl_node,
					    nfp_flower_table_params));
	kfree_rcu(nfp_flow, rcu);
	return err;
}

static void
__nfp_flower_update_merge_stats(struct nfp_app *app,
				struct nfp_fl_payload *merge_flow)
{
	struct nfp_flower_priv *priv = app->priv;
	struct nfp_fl_payload_link *link;
	struct nfp_fl_payload *sub_flow;
	u64 pkts, bytes, used;
	u32 ctx_id;

	ctx_id = be32_to_cpu(merge_flow->meta.host_ctx_id);
	pkts = priv->stats[ctx_id].pkts;
	/* Do not cycle subflows if no stats to distribute. */
	if (!pkts)
		return;
	bytes = priv->stats[ctx_id].bytes;
	used = priv->stats[ctx_id].used;

	/* Reset stats for the merge flow. */
	priv->stats[ctx_id].pkts = 0;
	priv->stats[ctx_id].bytes = 0;

	/* The merge flow has received stats updates from firmware.
	 * Distribute these stats to all subflows that form the merge.
	 * The stats will collected from TC via the subflows.
	 */
	list_for_each_entry(link, &merge_flow->linked_flows, merge_flow.list) {
		sub_flow = link->sub_flow.flow;
		ctx_id = be32_to_cpu(sub_flow->meta.host_ctx_id);
		priv->stats[ctx_id].pkts += pkts;
		priv->stats[ctx_id].bytes += bytes;
		priv->stats[ctx_id].used = max_t(u64, used,
						 priv->stats[ctx_id].used);
	}
}

void
nfp_flower_update_merge_stats(struct nfp_app *app,
			      struct nfp_fl_payload *sub_flow)
{
	struct nfp_fl_payload_link *link;

	/* Get merge flows that the subflow forms to distribute their stats. */
	list_for_each_entry(link, &sub_flow->linked_flows, sub_flow.list)
		__nfp_flower_update_merge_stats(app, link->merge_flow.flow);
}

/**
 * nfp_flower_get_stats() - Populates flow stats obtained from hardware.
 * @app:	Pointer to the APP handle
 * @netdev:	Netdev structure.
 * @flow:	TC flower classifier offload structure
 *
 * Populates a flow statistics structure which which corresponds to a
 * specific flow.
 *
 * Return: negative value on error, 0 if stats populated successfully.
 */
static int
nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
		     struct flow_cls_offload *flow)
{
	struct nfp_flower_priv *priv = app->priv;
	struct nfp_fl_ct_map_entry *ct_map_ent;
	struct netlink_ext_ack *extack = NULL;
	struct nfp_fl_payload *nfp_flow;
	u32 ctx_id;

	/* Check ct_map table first */
	ct_map_ent = rhashtable_lookup_fast(&priv->ct_map_table, &flow->cookie,
					    nfp_ct_map_params);
	if (ct_map_ent)
		return nfp_fl_ct_stats(flow, ct_map_ent);

	extack = flow->common.extack;
	nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
	if (!nfp_flow) {
		NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot dump stats for flow that does not exist");
		return -EINVAL;
	}

	ctx_id = be32_to_cpu(nfp_flow->meta.host_ctx_id);

	spin_lock_bh(&priv->stats_lock);
	/* If request is for a sub_flow, update stats from merged flows. */
	if (!list_empty(&nfp_flow->linked_flows))
		nfp_flower_update_merge_stats(app, nfp_flow);

	flow_stats_update(&flow->stats, priv->stats[ctx_id].bytes,
			  priv->stats[ctx_id].pkts, 0, priv->stats[ctx_id].used,
			  FLOW_ACTION_HW_STATS_DELAYED);

	priv->stats[ctx_id].pkts = 0;
	priv->stats[ctx_id].bytes = 0;
	spin_unlock_bh(&priv->stats_lock);

	return 0;
}

static int
nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev,
			struct flow_cls_offload *flower)
{
	if (!eth_proto_is_802_3(flower->common.protocol))
		return -EOPNOTSUPP;

	switch (flower->command) {
	case FLOW_CLS_REPLACE:
		return nfp_flower_add_offload(app, netdev, flower);
	case FLOW_CLS_DESTROY:
		return nfp_flower_del_offload(app, netdev, flower);
	case FLOW_CLS_STATS:
		return nfp_flower_get_stats(app, netdev, flower);
	default:
		return -EOPNOTSUPP;
	}
}

static int nfp_flower_setup_tc_block_cb(enum tc_setup_type type,
					void *type_data, void *cb_priv)
{
	struct flow_cls_common_offload *common = type_data;
	struct nfp_repr *repr = cb_priv;

	if (!tc_can_offload_extack(repr->netdev, common->extack))
		return -EOPNOTSUPP;

	switch (type) {
	case TC_SETUP_CLSFLOWER:
		return nfp_flower_repr_offload(repr->app, repr->netdev,
					       type_data);
	case TC_SETUP_CLSMATCHALL:
		return nfp_flower_setup_qos_offload(repr->app, repr->netdev,
						    type_data);
	default:
		return -EOPNOTSUPP;
	}
}

static LIST_HEAD(nfp_block_cb_list);

static int nfp_flower_setup_tc_block(struct net_device *netdev,
				     struct flow_block_offload *f)
{
	struct nfp_repr *repr = netdev_priv(netdev);
	struct nfp_flower_repr_priv *repr_priv;
	struct flow_block_cb *block_cb;

	if (f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
		return -EOPNOTSUPP;

	repr_priv = repr->app_priv;
	repr_priv->block_shared = f->block_shared;
	f->driver_block_list = &nfp_block_cb_list;

	switch (f->command) {
	case FLOW_BLOCK_BIND:
		if (flow_block_cb_is_busy(nfp_flower_setup_tc_block_cb, repr,
					  &nfp_block_cb_list))
			return -EBUSY;

		block_cb = flow_block_cb_alloc(nfp_flower_setup_tc_block_cb,
					       repr, repr, NULL);
		if (IS_ERR(block_cb))
			return PTR_ERR(block_cb);

		flow_block_cb_add(block_cb, f);
		list_add_tail(&block_cb->driver_list, &nfp_block_cb_list);
		return 0;
	case FLOW_BLOCK_UNBIND:
		block_cb = flow_block_cb_lookup(f->block,
						nfp_flower_setup_tc_block_cb,
						repr);
		if (!block_cb)
			return -ENOENT;

		flow_block_cb_remove(block_cb, f);
		list_del(&block_cb->driver_list);
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
			enum tc_setup_type type, void *type_data)
{
	switch (type) {
	case TC_SETUP_BLOCK:
		return nfp_flower_setup_tc_block(netdev, type_data);
	default:
		return -EOPNOTSUPP;
	}
}

struct nfp_flower_indr_block_cb_priv {
	struct net_device *netdev;
	struct nfp_app *app;
	struct list_head list;
};

static struct nfp_flower_indr_block_cb_priv *
nfp_flower_indr_block_cb_priv_lookup(struct nfp_app *app,
				     struct net_device *netdev)
{
	struct nfp_flower_indr_block_cb_priv *cb_priv;
	struct nfp_flower_priv *priv = app->priv;

	list_for_each_entry(cb_priv, &priv->indr_block_cb_priv, list)
		if (cb_priv->netdev == netdev)
			return cb_priv;

	return NULL;
}

static int nfp_flower_setup_indr_block_cb(enum tc_setup_type type,
					  void *type_data, void *cb_priv)
{
	struct nfp_flower_indr_block_cb_priv *priv = cb_priv;

	switch (type) {
	case TC_SETUP_CLSFLOWER:
		return nfp_flower_repr_offload(priv->app, priv->netdev,
					       type_data);
	default:
		return -EOPNOTSUPP;
	}
}

void nfp_flower_setup_indr_tc_release(void *cb_priv)
{
	struct nfp_flower_indr_block_cb_priv *priv = cb_priv;

	list_del(&priv->list);
	kfree(priv);
}

static int
nfp_flower_setup_indr_tc_block(struct net_device *netdev, struct Qdisc *sch, struct nfp_app *app,
			       struct flow_block_offload *f, void *data,
			       void (*cleanup)(struct flow_block_cb *block_cb))
{
	struct nfp_flower_indr_block_cb_priv *cb_priv;
	struct nfp_flower_priv *priv = app->priv;
	struct flow_block_cb *block_cb;

	if ((f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
	     !nfp_flower_internal_port_can_offload(app, netdev)) ||
	    (f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS &&
	     nfp_flower_internal_port_can_offload(app, netdev)))
		return -EOPNOTSUPP;

	switch (f->command) {
	case FLOW_BLOCK_BIND:
		cb_priv = nfp_flower_indr_block_cb_priv_lookup(app, netdev);
		if (cb_priv &&
		    flow_block_cb_is_busy(nfp_flower_setup_indr_block_cb,
					  cb_priv,
					  &nfp_block_cb_list))
			return -EBUSY;

		cb_priv = kmalloc(sizeof(*cb_priv), GFP_KERNEL);
		if (!cb_priv)
			return -ENOMEM;

		cb_priv->netdev = netdev;
		cb_priv->app = app;
		list_add(&cb_priv->list, &priv->indr_block_cb_priv);

		block_cb = flow_indr_block_cb_alloc(nfp_flower_setup_indr_block_cb,
						    cb_priv, cb_priv,
						    nfp_flower_setup_indr_tc_release,
						    f, netdev, sch, data, app, cleanup);
		if (IS_ERR(block_cb)) {
			list_del(&cb_priv->list);
			kfree(cb_priv);
			return PTR_ERR(block_cb);
		}

		flow_block_cb_add(block_cb, f);
		list_add_tail(&block_cb->driver_list, &nfp_block_cb_list);
		return 0;
	case FLOW_BLOCK_UNBIND:
		cb_priv = nfp_flower_indr_block_cb_priv_lookup(app, netdev);
		if (!cb_priv)
			return -ENOENT;

		block_cb = flow_block_cb_lookup(f->block,
						nfp_flower_setup_indr_block_cb,
						cb_priv);
		if (!block_cb)
			return -ENOENT;

		flow_indr_block_cb_remove(block_cb, f);
		list_del(&block_cb->driver_list);
		return 0;
	default:
		return -EOPNOTSUPP;
	}
	return 0;
}

static int
nfp_setup_tc_no_dev(struct nfp_app *app, enum tc_setup_type type, void *data)
{
	if (!data)
		return -EOPNOTSUPP;

	switch (type) {
	case TC_SETUP_ACT:
		return nfp_setup_tc_act_offload(app, data);
	default:
		return -EOPNOTSUPP;
	}
}

int
nfp_flower_indr_setup_tc_cb(struct net_device *netdev, struct Qdisc *sch, void *cb_priv,
			    enum tc_setup_type type, void *type_data,
			    void *data,
			    void (*cleanup)(struct flow_block_cb *block_cb))
{
	if (!netdev)
		return nfp_setup_tc_no_dev(cb_priv, type, data);

	if (!nfp_fl_is_netdev_to_offload(netdev))
		return -EOPNOTSUPP;

	switch (type) {
	case TC_SETUP_BLOCK:
		return nfp_flower_setup_indr_tc_block(netdev, sch, cb_priv,
						      type_data, data, cleanup);
	default:
		return -EOPNOTSUPP;
	}
}