summaryrefslogtreecommitdiffstats
path: root/drivers/crypto/bcm/spu2.c
blob: bf7ac621c591dcad6737c42edb06d9392c27c8f9 (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
/*
 * Copyright 2016 Broadcom
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation (the "GPL").
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 (GPLv2) for more details.
 *
 * You should have received a copy of the GNU General Public License
 * version 2 (GPLv2) along with this source code.
 */

/*
 * This file works with the SPU2 version of the SPU. SPU2 has different message
 * formats than the previous version of the SPU. All SPU message format
 * differences should be hidden in the spux.c,h files.
 */

#include <linux/kernel.h>
#include <linux/string.h>

#include "util.h"
#include "spu.h"
#include "spu2.h"

#define SPU2_TX_STATUS_LEN  0	/* SPU2 has no STATUS in input packet */

/*
 * Controlled by pkt_stat_cnt field in CRYPTO_SS_SPU0_CORE_SPU2_CONTROL0
 * register. Defaults to 2.
 */
#define SPU2_RX_STATUS_LEN  2

enum spu2_proto_sel {
	SPU2_PROTO_RESV = 0,
	SPU2_MACSEC_SECTAG8_ECB = 1,
	SPU2_MACSEC_SECTAG8_SCB = 2,
	SPU2_MACSEC_SECTAG16 = 3,
	SPU2_MACSEC_SECTAG16_8_XPN = 4,
	SPU2_IPSEC = 5,
	SPU2_IPSEC_ESN = 6,
	SPU2_TLS_CIPHER = 7,
	SPU2_TLS_AEAD = 8,
	SPU2_DTLS_CIPHER = 9,
	SPU2_DTLS_AEAD = 10
};

char *spu2_cipher_type_names[] = { "None", "AES128", "AES192", "AES256",
	"DES", "3DES"
};

char *spu2_cipher_mode_names[] = { "ECB", "CBC", "CTR", "CFB", "OFB", "XTS",
	"CCM", "GCM"
};

char *spu2_hash_type_names[] = { "None", "AES128", "AES192", "AES256",
	"Reserved", "Reserved", "MD5", "SHA1", "SHA224", "SHA256", "SHA384",
	"SHA512", "SHA512/224", "SHA512/256", "SHA3-224", "SHA3-256",
	"SHA3-384", "SHA3-512"
};

char *spu2_hash_mode_names[] = { "CMAC", "CBC-MAC", "XCBC-MAC", "HMAC",
	"Rabin", "CCM", "GCM", "Reserved"
};

static char *spu2_ciph_type_name(enum spu2_cipher_type cipher_type)
{
	if (cipher_type >= SPU2_CIPHER_TYPE_LAST)
		return "Reserved";
	return spu2_cipher_type_names[cipher_type];
}

static char *spu2_ciph_mode_name(enum spu2_cipher_mode cipher_mode)
{
	if (cipher_mode >= SPU2_CIPHER_MODE_LAST)
		return "Reserved";
	return spu2_cipher_mode_names[cipher_mode];
}

static char *spu2_hash_type_name(enum spu2_hash_type hash_type)
{
	if (hash_type >= SPU2_HASH_TYPE_LAST)
		return "Reserved";
	return spu2_hash_type_names[hash_type];
}

static char *spu2_hash_mode_name(enum spu2_hash_mode hash_mode)
{
	if (hash_mode >= SPU2_HASH_MODE_LAST)
		return "Reserved";
	return spu2_hash_mode_names[hash_mode];
}

/*
 * Convert from a software cipher mode value to the corresponding value
 * for SPU2.
 */
static int spu2_cipher_mode_xlate(enum spu_cipher_mode cipher_mode,
				  enum spu2_cipher_mode *spu2_mode)
{
	switch (cipher_mode) {
	case CIPHER_MODE_ECB:
		*spu2_mode = SPU2_CIPHER_MODE_ECB;
		break;
	case CIPHER_MODE_CBC:
		*spu2_mode = SPU2_CIPHER_MODE_CBC;
		break;
	case CIPHER_MODE_OFB:
		*spu2_mode = SPU2_CIPHER_MODE_OFB;
		break;
	case CIPHER_MODE_CFB:
		*spu2_mode = SPU2_CIPHER_MODE_CFB;
		break;
	case CIPHER_MODE_CTR:
		*spu2_mode = SPU2_CIPHER_MODE_CTR;
		break;
	case CIPHER_MODE_CCM:
		*spu2_mode = SPU2_CIPHER_MODE_CCM;
		break;
	case CIPHER_MODE_GCM:
		*spu2_mode = SPU2_CIPHER_MODE_GCM;
		break;
	case CIPHER_MODE_XTS:
		*spu2_mode = SPU2_CIPHER_MODE_XTS;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

/**
 * spu2_cipher_xlate() - Convert a cipher {alg/mode/type} triple to a SPU2
 * cipher type and mode.
 * @cipher_alg:  [in]  cipher algorithm value from software enumeration
 * @cipher_mode: [in]  cipher mode value from software enumeration
 * @cipher_type: [in]  cipher type value from software enumeration
 * @spu2_type:   [out] cipher type value used by spu2 hardware
 * @spu2_mode:   [out] cipher mode value used by spu2 hardware
 *
 * Return:  0 if successful
 */
static int spu2_cipher_xlate(enum spu_cipher_alg cipher_alg,
			     enum spu_cipher_mode cipher_mode,
			     enum spu_cipher_type cipher_type,
			     enum spu2_cipher_type *spu2_type,
			     enum spu2_cipher_mode *spu2_mode)
{
	int err;

	err = spu2_cipher_mode_xlate(cipher_mode, spu2_mode);
	if (err) {
		flow_log("Invalid cipher mode %d\n", cipher_mode);
		return err;
	}

	switch (cipher_alg) {
	case CIPHER_ALG_NONE:
		*spu2_type = SPU2_CIPHER_TYPE_NONE;
		break;
	case CIPHER_ALG_RC4:
		/* SPU2 does not support RC4 */
		err = -EINVAL;
		*spu2_type = SPU2_CIPHER_TYPE_NONE;
		break;
	case CIPHER_ALG_DES:
		*spu2_type = SPU2_CIPHER_TYPE_DES;
		break;
	case CIPHER_ALG_3DES:
		*spu2_type = SPU2_CIPHER_TYPE_3DES;
		break;
	case CIPHER_ALG_AES:
		switch (cipher_type) {
		case CIPHER_TYPE_AES128:
			*spu2_type = SPU2_CIPHER_TYPE_AES128;
			break;
		case CIPHER_TYPE_AES192:
			*spu2_type = SPU2_CIPHER_TYPE_AES192;
			break;
		case CIPHER_TYPE_AES256:
			*spu2_type = SPU2_CIPHER_TYPE_AES256;
			break;
		default:
			err = -EINVAL;
		}
		break;
	case CIPHER_ALG_LAST:
	default:
		err = -EINVAL;
		break;
	}

	if (err)
		flow_log("Invalid cipher alg %d or type %d\n",
			 cipher_alg, cipher_type);
	return err;
}

/*
 * Convert from a software hash mode value to the corresponding value
 * for SPU2. Note that HASH_MODE_NONE and HASH_MODE_XCBC have the same value.
 */
static int spu2_hash_mode_xlate(enum hash_mode hash_mode,
				enum spu2_hash_mode *spu2_mode)
{
	switch (hash_mode) {
	case HASH_MODE_XCBC:
		*spu2_mode = SPU2_HASH_MODE_XCBC_MAC;
		break;
	case HASH_MODE_CMAC:
		*spu2_mode = SPU2_HASH_MODE_CMAC;
		break;
	case HASH_MODE_HMAC:
		*spu2_mode = SPU2_HASH_MODE_HMAC;
		break;
	case HASH_MODE_CCM:
		*spu2_mode = SPU2_HASH_MODE_CCM;
		break;
	case HASH_MODE_GCM:
		*spu2_mode = SPU2_HASH_MODE_GCM;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

/**
 * spu2_hash_xlate() - Convert a hash {alg/mode/type} triple to a SPU2 hash type
 * and mode.
 * @hash_alg:  [in] hash algorithm value from software enumeration
 * @hash_mode: [in] hash mode value from software enumeration
 * @hash_type: [in] hash type value from software enumeration
 * @ciph_type: [in] cipher type value from software enumeration
 * @spu2_type: [out] hash type value used by SPU2 hardware
 * @spu2_mode: [out] hash mode value used by SPU2 hardware
 *
 * Return:  0 if successful
 */
static int
spu2_hash_xlate(enum hash_alg hash_alg, enum hash_mode hash_mode,
		enum hash_type hash_type, enum spu_cipher_type ciph_type,
		enum spu2_hash_type *spu2_type, enum spu2_hash_mode *spu2_mode)
{
	int err;

	err = spu2_hash_mode_xlate(hash_mode, spu2_mode);
	if (err) {
		flow_log("Invalid hash mode %d\n", hash_mode);
		return err;
	}

	switch (hash_alg) {
	case HASH_ALG_NONE:
		*spu2_type = SPU2_HASH_TYPE_NONE;
		break;
	case HASH_ALG_MD5:
		*spu2_type = SPU2_HASH_TYPE_MD5;
		break;
	case HASH_ALG_SHA1:
		*spu2_type = SPU2_HASH_TYPE_SHA1;
		break;
	case HASH_ALG_SHA224:
		*spu2_type = SPU2_HASH_TYPE_SHA224;
		break;
	case HASH_ALG_SHA256:
		*spu2_type = SPU2_HASH_TYPE_SHA256;
		break;
	case HASH_ALG_SHA384:
		*spu2_type = SPU2_HASH_TYPE_SHA384;
		break;
	case HASH_ALG_SHA512:
		*spu2_type = SPU2_HASH_TYPE_SHA512;
		break;
	case HASH_ALG_AES:
		switch (ciph_type) {
		case CIPHER_TYPE_AES128:
			*spu2_type = SPU2_HASH_TYPE_AES128;
			break;
		case CIPHER_TYPE_AES192:
			*spu2_type = SPU2_HASH_TYPE_AES192;
			break;
		case CIPHER_TYPE_AES256:
			*spu2_type = SPU2_HASH_TYPE_AES256;
			break;
		default:
			err = -EINVAL;
		}
		break;
	case HASH_ALG_SHA3_224:
		*spu2_type = SPU2_HASH_TYPE_SHA3_224;
		break;
	case HASH_ALG_SHA3_256:
		*spu2_type = SPU2_HASH_TYPE_SHA3_256;
		break;
	case HASH_ALG_SHA3_384:
		*spu2_type = SPU2_HASH_TYPE_SHA3_384;
		break;
	case HASH_ALG_SHA3_512:
		*spu2_type = SPU2_HASH_TYPE_SHA3_512;
		break;
	case HASH_ALG_LAST:
	default:
		err = -EINVAL;
		break;
	}

	if (err)
		flow_log("Invalid hash alg %d or type %d\n",
			 hash_alg, hash_type);
	return err;
}

/* Dump FMD ctrl0. The ctrl0 input is in host byte order */
static void spu2_dump_fmd_ctrl0(u64 ctrl0)
{
	enum spu2_cipher_type ciph_type;
	enum spu2_cipher_mode ciph_mode;
	enum spu2_hash_type hash_type;
	enum spu2_hash_mode hash_mode;
	char *ciph_name;
	char *ciph_mode_name;
	char *hash_name;
	char *hash_mode_name;
	u8 cfb;
	u8 proto;

	packet_log(" FMD CTRL0 %#16llx\n", ctrl0);
	if (ctrl0 & SPU2_CIPH_ENCRYPT_EN)
		packet_log("  encrypt\n");
	else
		packet_log("  decrypt\n");

	ciph_type = (ctrl0 & SPU2_CIPH_TYPE) >> SPU2_CIPH_TYPE_SHIFT;
	ciph_name = spu2_ciph_type_name(ciph_type);
	packet_log("  Cipher type: %s\n", ciph_name);

	if (ciph_type != SPU2_CIPHER_TYPE_NONE) {
		ciph_mode = (ctrl0 & SPU2_CIPH_MODE) >> SPU2_CIPH_MODE_SHIFT;
		ciph_mode_name = spu2_ciph_mode_name(ciph_mode);
		packet_log("  Cipher mode: %s\n", ciph_mode_name);
	}

	cfb = (ctrl0 & SPU2_CFB_MASK) >> SPU2_CFB_MASK_SHIFT;
	packet_log("  CFB %#x\n", cfb);

	proto = (ctrl0 & SPU2_PROTO_SEL) >> SPU2_PROTO_SEL_SHIFT;
	packet_log("  protocol %#x\n", proto);

	if (ctrl0 & SPU2_HASH_FIRST)
		packet_log("  hash first\n");
	else
		packet_log("  cipher first\n");

	if (ctrl0 & SPU2_CHK_TAG)
		packet_log("  check tag\n");

	hash_type = (ctrl0 & SPU2_HASH_TYPE) >> SPU2_HASH_TYPE_SHIFT;
	hash_name = spu2_hash_type_name(hash_type);
	packet_log("  Hash type: %s\n", hash_name);

	if (hash_type != SPU2_HASH_TYPE_NONE) {
		hash_mode = (ctrl0 & SPU2_HASH_MODE) >> SPU2_HASH_MODE_SHIFT;
		hash_mode_name = spu2_hash_mode_name(hash_mode);
		packet_log("  Hash mode: %s\n", hash_mode_name);
	}

	if (ctrl0 & SPU2_CIPH_PAD_EN) {
		packet_log("  Cipher pad: %#2llx\n",
			   (ctrl0 & SPU2_CIPH_PAD) >> SPU2_CIPH_PAD_SHIFT);
	}
}

/* Dump FMD ctrl1. The ctrl1 input is in host byte order */
static void spu2_dump_fmd_ctrl1(u64 ctrl1)
{
	u8 hash_key_len;
	u8 ciph_key_len;
	u8 ret_iv_len;
	u8 iv_offset;
	u8 iv_len;
	u8 hash_tag_len;
	u8 ret_md;

	packet_log(" FMD CTRL1 %#16llx\n", ctrl1);
	if (ctrl1 & SPU2_TAG_LOC)
		packet_log("  Tag after payload\n");

	packet_log("  Msg includes ");
	if (ctrl1 & SPU2_HAS_FR_DATA)
		packet_log("FD ");
	if (ctrl1 & SPU2_HAS_AAD1)
		packet_log("AAD1 ");
	if (ctrl1 & SPU2_HAS_NAAD)
		packet_log("NAAD ");
	if (ctrl1 & SPU2_HAS_AAD2)
		packet_log("AAD2 ");
	if (ctrl1 & SPU2_HAS_ESN)
		packet_log("ESN ");
	packet_log("\n");

	hash_key_len = (ctrl1 & SPU2_HASH_KEY_LEN) >> SPU2_HASH_KEY_LEN_SHIFT;
	packet_log("  Hash key len %u\n", hash_key_len);

	ciph_key_len = (ctrl1 & SPU2_CIPH_KEY_LEN) >> SPU2_CIPH_KEY_LEN_SHIFT;
	packet_log("  Cipher key len %u\n", ciph_key_len);

	if (ctrl1 & SPU2_GENIV)
		packet_log("  Generate IV\n");

	if (ctrl1 & SPU2_HASH_IV)
		packet_log("  IV included in hash\n");

	if (ctrl1 & SPU2_RET_IV)
		packet_log("  Return IV in output before payload\n");

	ret_iv_len = (ctrl1 & SPU2_RET_IV_LEN) >> SPU2_RET_IV_LEN_SHIFT;
	packet_log("  Length of returned IV %u bytes\n",
		   ret_iv_len ? ret_iv_len : 16);

	iv_offset = (ctrl1 & SPU2_IV_OFFSET) >> SPU2_IV_OFFSET_SHIFT;
	packet_log("  IV offset %u\n", iv_offset);

	iv_len = (ctrl1 & SPU2_IV_LEN) >> SPU2_IV_LEN_SHIFT;
	packet_log("  Input IV len %u bytes\n", iv_len);

	hash_tag_len = (ctrl1 & SPU2_HASH_TAG_LEN) >> SPU2_HASH_TAG_LEN_SHIFT;
	packet_log("  Hash tag length %u bytes\n", hash_tag_len);

	packet_log("  Return ");
	ret_md = (ctrl1 & SPU2_RETURN_MD) >> SPU2_RETURN_MD_SHIFT;
	if (ret_md)
		packet_log("FMD ");
	if (ret_md == SPU2_RET_FMD_OMD)
		packet_log("OMD ");
	else if (ret_md == SPU2_RET_FMD_OMD_IV)
		packet_log("OMD IV ");
	if (ctrl1 & SPU2_RETURN_FD)
		packet_log("FD ");
	if (ctrl1 & SPU2_RETURN_AAD1)
		packet_log("AAD1 ");
	if (ctrl1 & SPU2_RETURN_NAAD)
		packet_log("NAAD ");
	if (ctrl1 & SPU2_RETURN_AAD2)
		packet_log("AAD2 ");
	if (ctrl1 & SPU2_RETURN_PAY)
		packet_log("Payload");
	packet_log("\n");
}

/* Dump FMD ctrl2. The ctrl2 input is in host byte order */
static void spu2_dump_fmd_ctrl2(u64 ctrl2)
{
	packet_log(" FMD CTRL2 %#16llx\n", ctrl2);

	packet_log("  AAD1 offset %llu length %llu bytes\n",
		   ctrl2 & SPU2_AAD1_OFFSET,
		   (ctrl2 & SPU2_AAD1_LEN) >> SPU2_AAD1_LEN_SHIFT);
	packet_log("  AAD2 offset %llu\n",
		   (ctrl2 & SPU2_AAD2_OFFSET) >> SPU2_AAD2_OFFSET_SHIFT);
	packet_log("  Payload offset %llu\n",
		   (ctrl2 & SPU2_PL_OFFSET) >> SPU2_PL_OFFSET_SHIFT);
}

/* Dump FMD ctrl3. The ctrl3 input is in host byte order */
static void spu2_dump_fmd_ctrl3(u64 ctrl3)
{
	packet_log(" FMD CTRL3 %#16llx\n", ctrl3);

	packet_log("  Payload length %llu bytes\n", ctrl3 & SPU2_PL_LEN);
	packet_log("  TLS length %llu bytes\n",
		   (ctrl3 & SPU2_TLS_LEN) >> SPU2_TLS_LEN_SHIFT);
}

static void spu2_dump_fmd(struct SPU2_FMD *fmd)
{
	spu2_dump_fmd_ctrl0(le64_to_cpu(fmd->ctrl0));
	spu2_dump_fmd_ctrl1(le64_to_cpu(fmd->ctrl1));
	spu2_dump_fmd_ctrl2(le64_to_cpu(fmd->ctrl2));
	spu2_dump_fmd_ctrl3(le64_to_cpu(fmd->ctrl3));
}

static void spu2_dump_omd(u8 *omd, u16 hash_key_len, u16 ciph_key_len,
			  u16 hash_iv_len, u16 ciph_iv_len)
{
	u8 *ptr = omd;

	packet_log(" OMD:\n");

	if (hash_key_len) {
		packet_log("  Hash Key Length %u bytes\n", hash_key_len);
		packet_dump("  KEY: ", ptr, hash_key_len);
		ptr += hash_key_len;
	}

	if (ciph_key_len) {
		packet_log("  Cipher Key Length %u bytes\n", ciph_key_len);
		packet_dump("  KEY: ", ptr, ciph_key_len);
		ptr += ciph_key_len;
	}

	if (hash_iv_len) {
		packet_log("  Hash IV Length %u bytes\n", hash_iv_len);
		packet_dump("  hash IV: ", ptr, hash_iv_len);
		ptr += ciph_key_len;
	}

	if (ciph_iv_len) {
		packet_log("  Cipher IV Length %u bytes\n", ciph_iv_len);
		packet_dump("  cipher IV: ", ptr, ciph_iv_len);
	}
}

/* Dump a SPU2 header for debug */
void spu2_dump_msg_hdr(u8 *buf, unsigned int buf_len)
{
	struct SPU2_FMD *fmd = (struct SPU2_FMD *)buf;
	u8 *omd;
	u64 ctrl1;
	u16 hash_key_len;
	u16 ciph_key_len;
	u16 hash_iv_len;
	u16 ciph_iv_len;
	u16 omd_len;

	packet_log("\n");
	packet_log("SPU2 message header %p len: %u\n", buf, buf_len);

	spu2_dump_fmd(fmd);
	omd = (u8 *)(fmd + 1);

	ctrl1 = le64_to_cpu(fmd->ctrl1);
	hash_key_len = (ctrl1 & SPU2_HASH_KEY_LEN) >> SPU2_HASH_KEY_LEN_SHIFT;
	ciph_key_len = (ctrl1 & SPU2_CIPH_KEY_LEN) >> SPU2_CIPH_KEY_LEN_SHIFT;
	hash_iv_len = 0;
	ciph_iv_len = (ctrl1 & SPU2_IV_LEN) >> SPU2_IV_LEN_SHIFT;
	spu2_dump_omd(omd, hash_key_len, ciph_key_len, hash_iv_len,
		      ciph_iv_len);

	/* Double check sanity */
	omd_len = hash_key_len + ciph_key_len + hash_iv_len + ciph_iv_len;
	if (FMD_SIZE + omd_len != buf_len) {
		packet_log
		    (" Packet parsed incorrectly. buf_len %u, sum of MD %zu\n",
		     buf_len, FMD_SIZE + omd_len);
	}
	packet_log("\n");
}

/**
 * spu2_fmd_init() - At setkey time, initialize the fixed meta data for
 * subsequent ablkcipher requests for this context.
 * @spu2_cipher_type:  Cipher algorithm
 * @spu2_mode:         Cipher mode
 * @cipher_key_len:    Length of cipher key, in bytes
 * @cipher_iv_len:     Length of cipher initialization vector, in bytes
 *
 * Return:  0 (success)
 */
static int spu2_fmd_init(struct SPU2_FMD *fmd,
			 enum spu2_cipher_type spu2_type,
			 enum spu2_cipher_mode spu2_mode,
			 u32 cipher_key_len, u32 cipher_iv_len)
{
	u64 ctrl0;
	u64 ctrl1;
	u64 ctrl2;
	u64 ctrl3;
	u32 aad1_offset;
	u32 aad2_offset;
	u16 aad1_len = 0;
	u64 payload_offset;

	ctrl0 = (spu2_type << SPU2_CIPH_TYPE_SHIFT) |
	    (spu2_mode << SPU2_CIPH_MODE_SHIFT);

	ctrl1 = (cipher_key_len << SPU2_CIPH_KEY_LEN_SHIFT) |
	    ((u64)cipher_iv_len << SPU2_IV_LEN_SHIFT) |
	    ((u64)SPU2_RET_FMD_ONLY << SPU2_RETURN_MD_SHIFT) | SPU2_RETURN_PAY;

	/*
	 * AAD1 offset is from start of FD. FD length is always 0 for this
	 * driver. So AAD1_offset is always 0.
	 */
	aad1_offset = 0;
	aad2_offset = aad1_offset;
	payload_offset = 0;
	ctrl2 = aad1_offset |
	    (aad1_len << SPU2_AAD1_LEN_SHIFT) |
	    (aad2_offset << SPU2_AAD2_OFFSET_SHIFT) |
	    (payload_offset << SPU2_PL_OFFSET_SHIFT);

	ctrl3 = 0;

	fmd->ctrl0 = cpu_to_le64(ctrl0);
	fmd->ctrl1 = cpu_to_le64(ctrl1);
	fmd->ctrl2 = cpu_to_le64(ctrl2);
	fmd->ctrl3 = cpu_to_le64(ctrl3);

	return 0;
}

/**
 * spu2_fmd_ctrl0_write() - Write ctrl0 field in fixed metadata (FMD) field of
 * SPU request packet.
 * @fmd:            Start of FMD field to be written
 * @is_inbound:     true if decrypting. false if encrypting.
 * @authFirst:      true if alg authenticates before encrypting
 * @protocol:       protocol selector
 * @cipher_type:    cipher algorithm
 * @cipher_mode:    cipher mode
 * @auth_type:      authentication type
 * @auth_mode:      authentication mode
 */
static void spu2_fmd_ctrl0_write(struct SPU2_FMD *fmd,
				 bool is_inbound, bool auth_first,
				 enum spu2_proto_sel protocol,
				 enum spu2_cipher_type cipher_type,
				 enum spu2_cipher_mode cipher_mode,
				 enum spu2_hash_type auth_type,
				 enum spu2_hash_mode auth_mode)
{
	u64 ctrl0 = 0;

	if ((cipher_type != SPU2_CIPHER_TYPE_NONE) && !is_inbound)
		ctrl0 |= SPU2_CIPH_ENCRYPT_EN;

	ctrl0 |= ((u64)cipher_type << SPU2_CIPH_TYPE_SHIFT) |
	    ((u64)cipher_mode << SPU2_CIPH_MODE_SHIFT);

	if (protocol)
		ctrl0 |= (u64)protocol << SPU2_PROTO_SEL_SHIFT;

	if (auth_first)
		ctrl0 |= SPU2_HASH_FIRST;

	if (is_inbound && (auth_type != SPU2_HASH_TYPE_NONE))
		ctrl0 |= SPU2_CHK_TAG;

	ctrl0 |= (((u64)auth_type << SPU2_HASH_TYPE_SHIFT) |
		  ((u64)auth_mode << SPU2_HASH_MODE_SHIFT));

	fmd->ctrl0 = cpu_to_le64(ctrl0);
}

/**
 * spu2_fmd_ctrl1_write() - Write ctrl1 field in fixed metadata (FMD) field of
 * SPU request packet.
 * @fmd:            Start of FMD field to be written
 * @assoc_size:     Length of additional associated data, in bytes
 * @auth_key_len:   Length of authentication key, in bytes
 * @cipher_key_len: Length of cipher key, in bytes
 * @gen_iv:         If true, hw generates IV and returns in response
 * @hash_iv:        IV participates in hash. Used for IPSEC and TLS.
 * @return_iv:      Return IV in output packet before payload
 * @ret_iv_len:     Length of IV returned from SPU, in bytes
 * @ret_iv_offset:  Offset into full IV of start of returned IV
 * @cipher_iv_len:  Length of input cipher IV, in bytes
 * @digest_size:    Length of digest (aka, hash tag or ICV), in bytes
 * @return_payload: Return payload in SPU response
 * @return_md : return metadata in SPU response
 *
 * Packet can have AAD2 w/o AAD1. For algorithms currently supported,
 * associated data goes in AAD2.
 */
static void spu2_fmd_ctrl1_write(struct SPU2_FMD *fmd, bool is_inbound,
				 u64 assoc_size,
				 u64 auth_key_len, u64 cipher_key_len,
				 bool gen_iv, bool hash_iv, bool return_iv,
				 u64 ret_iv_len, u64 ret_iv_offset,
				 u64 cipher_iv_len, u64 digest_size,
				 bool return_payload, bool return_md)
{
	u64 ctrl1 = 0;

	if (is_inbound && digest_size)
		ctrl1 |= SPU2_TAG_LOC;

	if (assoc_size) {
		ctrl1 |= SPU2_HAS_AAD2;
		ctrl1 |= SPU2_RETURN_AAD2;  /* need aad2 for gcm aes esp */
	}

	if (auth_key_len)
		ctrl1 |= ((auth_key_len << SPU2_HASH_KEY_LEN_SHIFT) &
			  SPU2_HASH_KEY_LEN);

	if (cipher_key_len)
		ctrl1 |= ((cipher_key_len << SPU2_CIPH_KEY_LEN_SHIFT) &
			  SPU2_CIPH_KEY_LEN);

	if (gen_iv)
		ctrl1 |= SPU2_GENIV;

	if (hash_iv)
		ctrl1 |= SPU2_HASH_IV;

	if (return_iv) {
		ctrl1 |= SPU2_RET_IV;
		ctrl1 |= ret_iv_len << SPU2_RET_IV_LEN_SHIFT;
		ctrl1 |= ret_iv_offset << SPU2_IV_OFFSET_SHIFT;
	}

	ctrl1 |= ((cipher_iv_len << SPU2_IV_LEN_SHIFT) & SPU2_IV_LEN);

	if (digest_size)
		ctrl1 |= ((digest_size << SPU2_HASH_TAG_LEN_SHIFT) &
			  SPU2_HASH_TAG_LEN);

	/* Let's ask for the output pkt to include FMD, but don't need to
	 * get keys and IVs back in OMD.
	 */
	if (return_md)
		ctrl1 |= ((u64)SPU2_RET_FMD_ONLY << SPU2_RETURN_MD_SHIFT);
	else
		ctrl1 |= ((u64)SPU2_RET_NO_MD << SPU2_RETURN_MD_SHIFT);

	/* Crypto API does not get assoc data back. So no need for AAD2. */

	if (return_payload)
		ctrl1 |= SPU2_RETURN_PAY;

	fmd->ctrl1 = cpu_to_le64(ctrl1);
}

/**
 * spu2_fmd_ctrl2_write() - Set the ctrl2 field in the fixed metadata field of
 * SPU2 header.
 * @fmd:            Start of FMD field to be written
 * @cipher_offset:  Number of bytes from Start of Packet (end of FD field) where
 *                  data to be encrypted or decrypted begins
 * @auth_key_len:   Length of authentication key, in bytes
 * @auth_iv_len:    Length of authentication initialization vector, in bytes
 * @cipher_key_len: Length of cipher key, in bytes
 * @cipher_iv_len:  Length of cipher IV, in bytes
 */
static void spu2_fmd_ctrl2_write(struct SPU2_FMD *fmd, u64 cipher_offset,
				 u64 auth_key_len, u64 auth_iv_len,
				 u64 cipher_key_len, u64 cipher_iv_len)
{
	u64 ctrl2;
	u64 aad1_offset;
	u64 aad2_offset;
	u16 aad1_len = 0;
	u64 payload_offset;

	/* AAD1 offset is from start of FD. FD length always 0. */
	aad1_offset = 0;

	aad2_offset = aad1_offset;
	payload_offset = cipher_offset;
	ctrl2 = aad1_offset |
	    (aad1_len << SPU2_AAD1_LEN_SHIFT) |
	    (aad2_offset << SPU2_AAD2_OFFSET_SHIFT) |
	    (payload_offset << SPU2_PL_OFFSET_SHIFT);

	fmd->ctrl2 = cpu_to_le64(ctrl2);
}

/**
 * spu2_fmd_ctrl3_write() - Set the ctrl3 field in FMD
 * @fmd:          Fixed meta data. First field in SPU2 msg header.
 * @payload_len:  Length of payload, in bytes
 */
static void spu2_fmd_ctrl3_write(struct SPU2_FMD *fmd, u64 payload_len)
{
	u64 ctrl3;

	ctrl3 = payload_len & SPU2_PL_LEN;

	fmd->ctrl3 = cpu_to_le64(ctrl3);
}

/**
 * spu2_ctx_max_payload() - Determine the maximum length of the payload for a
 * SPU message for a given cipher and hash alg context.
 * @cipher_alg:		The cipher algorithm
 * @cipher_mode:	The cipher mode
 * @blocksize:		The size of a block of data for this algo
 *
 * For SPU2, the hardware generally ignores the PayloadLen field in ctrl3 of
 * FMD and just keeps computing until it receives a DMA descriptor with the EOF
 * flag set. So we consider the max payload to be infinite. AES CCM is an
 * exception.
 *
 * Return: Max payload length in bytes
 */
u32 spu2_ctx_max_payload(enum spu_cipher_alg cipher_alg,
			 enum spu_cipher_mode cipher_mode,
			 unsigned int blocksize)
{
	if ((cipher_alg == CIPHER_ALG_AES) &&
	    (cipher_mode == CIPHER_MODE_CCM)) {
		u32 excess = SPU2_MAX_PAYLOAD % blocksize;

		return SPU2_MAX_PAYLOAD - excess;
	} else {
		return SPU_MAX_PAYLOAD_INF;
	}
}

/**
 * spu_payload_length() -  Given a SPU2 message header, extract the payload
 * length.
 * @spu_hdr:  Start of SPU message header (FMD)
 *
 * Return: payload length, in bytes
 */
u32 spu2_payload_length(u8 *spu_hdr)
{
	struct SPU2_FMD *fmd = (struct SPU2_FMD *)spu_hdr;
	u32 pl_len;
	u64 ctrl3;

	ctrl3 = le64_to_cpu(fmd->ctrl3);
	pl_len = ctrl3 & SPU2_PL_LEN;

	return pl_len;
}

/**
 * spu_response_hdr_len() - Determine the expected length of a SPU response
 * header.
 * @auth_key_len:  Length of authentication key, in bytes
 * @enc_key_len:   Length of encryption key, in bytes
 *
 * For SPU2, includes just FMD. OMD is never requested.
 *
 * Return: Length of FMD, in bytes
 */
u16 spu2_response_hdr_len(u16 auth_key_len, u16 enc_key_len, bool is_hash)
{
	return FMD_SIZE;
}

/**
 * spu_hash_pad_len() - Calculate the length of hash padding required to extend
 * data to a full block size.
 * @hash_alg:        hash algorithm
 * @hash_mode:       hash mode
 * @chunksize:       length of data, in bytes
 * @hash_block_size: size of a hash block, in bytes
 *
 * SPU2 hardware does all hash padding
 *
 * Return:  length of hash pad in bytes
 */
u16 spu2_hash_pad_len(enum hash_alg hash_alg, enum hash_mode hash_mode,
		      u32 chunksize, u16 hash_block_size)
{
	return 0;
}

/**
 * spu2_gcm_ccm_padlen() -  Determine the length of GCM/CCM padding for either
 * the AAD field or the data.
 *
 * Return:  0. Unlike SPU-M, SPU2 hardware does any GCM/CCM padding required.
 */
u32 spu2_gcm_ccm_pad_len(enum spu_cipher_mode cipher_mode,
			 unsigned int data_size)
{
	return 0;
}

/**
 * spu_assoc_resp_len() - Determine the size of the AAD2 buffer needed to catch
 * associated data in a SPU2 output packet.
 * @cipher_mode:   cipher mode
 * @assoc_len:     length of additional associated data, in bytes
 * @iv_len:        length of initialization vector, in bytes
 * @is_encrypt:    true if encrypting. false if decrypt.
 *
 * Return: Length of buffer to catch associated data in response
 */
u32 spu2_assoc_resp_len(enum spu_cipher_mode cipher_mode,
			unsigned int assoc_len, unsigned int iv_len,
			bool is_encrypt)
{
	u32 resp_len = assoc_len;

	if (is_encrypt)
		/* gcm aes esp has to write 8-byte IV in response */
		resp_len += iv_len;
	return resp_len;
}

/*
 * spu_aead_ivlen() - Calculate the length of the AEAD IV to be included
 * in a SPU request after the AAD and before the payload.
 * @cipher_mode:  cipher mode
 * @iv_ctr_len:   initialization vector length in bytes
 *
 * For SPU2, AEAD IV is included in OMD and does not need to be repeated
 * prior to the payload.
 *
 * Return: Length of AEAD IV in bytes
 */
u8 spu2_aead_ivlen(enum spu_cipher_mode cipher_mode, u16 iv_len)
{
	return 0;
}

/**
 * spu2_hash_type() - Determine the type of hash operation.
 * @src_sent:  The number of bytes in the current request that have already
 *             been sent to the SPU to be hashed.
 *
 * SPU2 always does a FULL hash operation
 */
enum hash_type spu2_hash_type(u32 src_sent)
{
	return HASH_TYPE_FULL;
}

/**
 * spu2_digest_size() - Determine the size of a hash digest to expect the SPU to
 * return.
 * alg_digest_size: Number of bytes in the final digest for the given algo
 * alg:             The hash algorithm
 * htype:           Type of hash operation (init, update, full, etc)
 *
 */
u32 spu2_digest_size(u32 alg_digest_size, enum hash_alg alg,
		     enum hash_type htype)
{
	return alg_digest_size;
}

/**
 * spu_create_request() - Build a SPU2 request message header, includint FMD and
 * OMD.
 * @spu_hdr: Start of buffer where SPU request header is to be written
 * @req_opts: SPU request message options
 * @cipher_parms: Parameters related to cipher algorithm
 * @hash_parms:   Parameters related to hash algorithm
 * @aead_parms:   Parameters related to AEAD operation
 * @data_size:    Length of data to be encrypted or authenticated. If AEAD, does
 *		  not include length of AAD.
 *
 * Construct the message starting at spu_hdr. Caller should allocate this buffer
 * in DMA-able memory at least SPU_HEADER_ALLOC_LEN bytes long.
 *
 * Return: the length of the SPU header in bytes. 0 if an error occurs.
 */
u32 spu2_create_request(u8 *spu_hdr,
			struct spu_request_opts *req_opts,
			struct spu_cipher_parms *cipher_parms,
			struct spu_hash_parms *hash_parms,
			struct spu_aead_parms *aead_parms,
			unsigned int data_size)
{
	struct SPU2_FMD *fmd;
	u8 *ptr;
	unsigned int buf_len;
	int err;
	enum spu2_cipher_type spu2_ciph_type = SPU2_CIPHER_TYPE_NONE;
	enum spu2_cipher_mode spu2_ciph_mode;
	enum spu2_hash_type spu2_auth_type = SPU2_HASH_TYPE_NONE;
	enum spu2_hash_mode spu2_auth_mode;
	bool return_md = true;
	enum spu2_proto_sel proto = SPU2_PROTO_RESV;

	/* size of the payload */
	unsigned int payload_len =
	    hash_parms->prebuf_len + data_size + hash_parms->pad_len -
	    ((req_opts->is_aead && req_opts->is_inbound) ?
	     hash_parms->digestsize : 0);

	/* offset of prebuf or data from start of AAD2 */
	unsigned int cipher_offset = aead_parms->assoc_size +
			aead_parms->aad_pad_len + aead_parms->iv_len;

#ifdef DEBUG
	/* total size of the data following OMD (without STAT word padding) */
	unsigned int real_db_size = spu_real_db_size(aead_parms->assoc_size,
						 aead_parms->iv_len,
						 hash_parms->prebuf_len,
						 data_size,
						 aead_parms->aad_pad_len,
						 aead_parms->data_pad_len,
						 hash_parms->pad_len);
#endif
	unsigned int assoc_size = aead_parms->assoc_size;

	if (req_opts->is_aead &&
	    (cipher_parms->alg == CIPHER_ALG_AES) &&
	    (cipher_parms->mode == CIPHER_MODE_GCM))
		/*
		 * On SPU 2, aes gcm cipher first on encrypt, auth first on
		 * decrypt
		 */
		req_opts->auth_first = req_opts->is_inbound;

	/* and do opposite for ccm (auth 1st on encrypt) */
	if (req_opts->is_aead &&
	    (cipher_parms->alg == CIPHER_ALG_AES) &&
	    (cipher_parms->mode == CIPHER_MODE_CCM))
		req_opts->auth_first = !req_opts->is_inbound;

	flow_log("%s()\n", __func__);
	flow_log("  in:%u authFirst:%u\n",
		 req_opts->is_inbound, req_opts->auth_first);
	flow_log("  cipher alg:%u mode:%u type %u\n", cipher_parms->alg,
		 cipher_parms->mode, cipher_parms->type);
	flow_log("  is_esp: %s\n", req_opts->is_esp ? "yes" : "no");
	flow_log("    key: %d\n", cipher_parms->key_len);
	flow_dump("    key: ", cipher_parms->key_buf, cipher_parms->key_len);
	flow_log("    iv: %d\n", cipher_parms->iv_len);
	flow_dump("    iv: ", cipher_parms->iv_buf, cipher_parms->iv_len);
	flow_log("  auth alg:%u mode:%u type %u\n",
		 hash_parms->alg, hash_parms->mode, hash_parms->type);
	flow_log("  digestsize: %u\n", hash_parms->digestsize);
	flow_log("  authkey: %d\n", hash_parms->key_len);
	flow_dump("  authkey: ", hash_parms->key_buf, hash_parms->key_len);
	flow_log("  assoc_size:%u\n", assoc_size);
	flow_log("  prebuf_len:%u\n", hash_parms->prebuf_len);
	flow_log("  data_size:%u\n", data_size);
	flow_log("  hash_pad_len:%u\n", hash_parms->pad_len);
	flow_log("  real_db_size:%u\n", real_db_size);
	flow_log("  cipher_offset:%u payload_len:%u\n",
		 cipher_offset, payload_len);
	flow_log("  aead_iv: %u\n", aead_parms->iv_len);

	/* Convert to spu2 values for cipher alg, hash alg */
	err = spu2_cipher_xlate(cipher_parms->alg, cipher_parms->mode,
				cipher_parms->type,
				&spu2_ciph_type, &spu2_ciph_mode);

	/* If we are doing GCM hashing only - either via rfc4543 transform
	 * or because we happen to do GCM with AAD only and no payload - we
	 * need to configure hardware to use hash key rather than cipher key
	 * and put data into payload.  This is because unlike SPU-M, running
	 * GCM cipher with 0 size payload is not permitted.
	 */
	if ((req_opts->is_rfc4543) ||
	    ((spu2_ciph_mode == SPU2_CIPHER_MODE_GCM) &&
	    (payload_len == 0))) {
		/* Use hashing (only) and set up hash key */
		spu2_ciph_type = SPU2_CIPHER_TYPE_NONE;
		hash_parms->key_len = cipher_parms->key_len;
		memcpy(hash_parms->key_buf, cipher_parms->key_buf,
		       cipher_parms->key_len);
		cipher_parms->key_len = 0;

		if (req_opts->is_rfc4543)
			payload_len += assoc_size;
		else
			payload_len = assoc_size;
		cipher_offset = 0;
		assoc_size = 0;
	}

	if (err)
		return 0;

	flow_log("spu2 cipher type %s, cipher mode %s\n",
		 spu2_ciph_type_name(spu2_ciph_type),
		 spu2_ciph_mode_name(spu2_ciph_mode));

	err = spu2_hash_xlate(hash_parms->alg, hash_parms->mode,
			      hash_parms->type,
			      cipher_parms->type,
			      &spu2_auth_type, &spu2_auth_mode);
	if (err)
		return 0;

	flow_log("spu2 hash type %s, hash mode %s\n",
		 spu2_hash_type_name(spu2_auth_type),
		 spu2_hash_mode_name(spu2_auth_mode));

	fmd = (struct SPU2_FMD *)spu_hdr;

	spu2_fmd_ctrl0_write(fmd, req_opts->is_inbound, req_opts->auth_first,
			     proto, spu2_ciph_type, spu2_ciph_mode,
			     spu2_auth_type, spu2_auth_mode);

	spu2_fmd_ctrl1_write(fmd, req_opts->is_inbound, assoc_size,
			     hash_parms->key_len, cipher_parms->key_len,
			     false, false,
			     aead_parms->return_iv, aead_parms->ret_iv_len,
			     aead_parms->ret_iv_off,
			     cipher_parms->iv_len, hash_parms->digestsize,
			     !req_opts->bd_suppress, return_md);

	spu2_fmd_ctrl2_write(fmd, cipher_offset, hash_parms->key_len, 0,
			     cipher_parms->key_len, cipher_parms->iv_len);

	spu2_fmd_ctrl3_write(fmd, payload_len);

	ptr = (u8 *)(fmd + 1);
	buf_len = sizeof(struct SPU2_FMD);

	/* Write OMD */
	if (hash_parms->key_len) {
		memcpy(ptr, hash_parms->key_buf, hash_parms->key_len);
		ptr += hash_parms->key_len;
		buf_len += hash_parms->key_len;
	}
	if (cipher_parms->key_len) {
		memcpy(ptr, cipher_parms->key_buf, cipher_parms->key_len);
		ptr += cipher_parms->key_len;
		buf_len += cipher_parms->key_len;
	}
	if (cipher_parms->iv_len) {
		memcpy(ptr, cipher_parms->iv_buf, cipher_parms->iv_len);
		ptr += cipher_parms->iv_len;
		buf_len += cipher_parms->iv_len;
	}

	packet_dump("  SPU request header: ", spu_hdr, buf_len);

	return buf_len;
}

/**
 * spu_cipher_req_init() - Build an ablkcipher SPU2 request message header,
 * including FMD and OMD.
 * @spu_hdr:       Location of start of SPU request (FMD field)
 * @cipher_parms:  Parameters describing cipher request
 *
 * Called at setkey time to initialize a msg header that can be reused for all
 * subsequent ablkcipher requests. Construct the message starting at spu_hdr.
 * Caller should allocate this buffer in DMA-able memory at least
 * SPU_HEADER_ALLOC_LEN bytes long.
 *
 * Return: the total length of the SPU header (FMD and OMD) in bytes. 0 if an
 * error occurs.
 */
u16 spu2_cipher_req_init(u8 *spu_hdr, struct spu_cipher_parms *cipher_parms)
{
	struct SPU2_FMD *fmd;
	u8 *omd;
	enum spu2_cipher_type spu2_type = SPU2_CIPHER_TYPE_NONE;
	enum spu2_cipher_mode spu2_mode;
	int err;

	flow_log("%s()\n", __func__);
	flow_log("  cipher alg:%u mode:%u type %u\n", cipher_parms->alg,
		 cipher_parms->mode, cipher_parms->type);
	flow_log("  cipher_iv_len: %u\n", cipher_parms->iv_len);
	flow_log("    key: %d\n", cipher_parms->key_len);
	flow_dump("    key: ", cipher_parms->key_buf, cipher_parms->key_len);

	/* Convert to spu2 values */
	err = spu2_cipher_xlate(cipher_parms->alg, cipher_parms->mode,
				cipher_parms->type, &spu2_type, &spu2_mode);
	if (err)
		return 0;

	flow_log("spu2 cipher type %s, cipher mode %s\n",
		 spu2_ciph_type_name(spu2_type),
		 spu2_ciph_mode_name(spu2_mode));

	/* Construct the FMD header */
	fmd = (struct SPU2_FMD *)spu_hdr;
	err = spu2_fmd_init(fmd, spu2_type, spu2_mode, cipher_parms->key_len,
			    cipher_parms->iv_len);
	if (err)
		return 0;

	/* Write cipher key to OMD */
	omd = (u8 *)(fmd + 1);
	if (cipher_parms->key_buf && cipher_parms->key_len)
		memcpy(omd, cipher_parms->key_buf, cipher_parms->key_len);

	packet_dump("  SPU request header: ", spu_hdr,
		    FMD_SIZE + cipher_parms->key_len + cipher_parms->iv_len);

	return FMD_SIZE + cipher_parms->key_len + cipher_parms->iv_len;
}

/**
 * spu_cipher_req_finish() - Finish building a SPU request message header for a
 * block cipher request.
 * @spu_hdr:         Start of the request message header (MH field)
 * @spu_req_hdr_len: Length in bytes of the SPU request header
 * @isInbound:       0 encrypt, 1 decrypt
 * @cipher_parms:    Parameters describing cipher operation to be performed
 * @update_key:      If true, rewrite the cipher key in SCTX
 * @data_size:       Length of the data in the BD field
 *
 * Assumes much of the header was already filled in at setkey() time in
 * spu_cipher_req_init().
 * spu_cipher_req_init() fills in the encryption key. For RC4, when submitting a
 * request for a non-first chunk, we use the 260-byte SUPDT field from the
 * previous response as the key. update_key is true for this case. Unused in all
 * other cases.
 */
void spu2_cipher_req_finish(u8 *spu_hdr,
			    u16 spu_req_hdr_len,
			    unsigned int is_inbound,
			    struct spu_cipher_parms *cipher_parms,
			    bool update_key,
			    unsigned int data_size)
{
	struct SPU2_FMD *fmd;
	u8 *omd;		/* start of optional metadata */
	u64 ctrl0;
	u64 ctrl3;

	flow_log("%s()\n", __func__);
	flow_log(" in: %u\n", is_inbound);
	flow_log(" cipher alg: %u, cipher_type: %u\n", cipher_parms->alg,
		 cipher_parms->type);
	if (update_key) {
		flow_log(" cipher key len: %u\n", cipher_parms->key_len);
		flow_dump("  key: ", cipher_parms->key_buf,
			  cipher_parms->key_len);
	}
	flow_log(" iv len: %d\n", cipher_parms->iv_len);
	flow_dump("    iv: ", cipher_parms->iv_buf, cipher_parms->iv_len);
	flow_log(" data_size: %u\n", data_size);

	fmd = (struct SPU2_FMD *)spu_hdr;
	omd = (u8 *)(fmd + 1);

	/*
	 * FMD ctrl0 was initialized at setkey time. update it to indicate
	 * whether we are encrypting or decrypting.
	 */
	ctrl0 = le64_to_cpu(fmd->ctrl0);
	if (is_inbound)
		ctrl0 &= ~SPU2_CIPH_ENCRYPT_EN;	/* decrypt */
	else
		ctrl0 |= SPU2_CIPH_ENCRYPT_EN;	/* encrypt */
	fmd->ctrl0 = cpu_to_le64(ctrl0);

	if (cipher_parms->alg && cipher_parms->iv_buf && cipher_parms->iv_len) {
		/* cipher iv provided so put it in here */
		memcpy(omd + cipher_parms->key_len, cipher_parms->iv_buf,
		       cipher_parms->iv_len);
	}

	ctrl3 = le64_to_cpu(fmd->ctrl3);
	data_size &= SPU2_PL_LEN;
	ctrl3 |= data_size;
	fmd->ctrl3 = cpu_to_le64(ctrl3);

	packet_dump("  SPU request header: ", spu_hdr, spu_req_hdr_len);
}

/**
 * spu_request_pad() - Create pad bytes at the end of the data.
 * @pad_start:      Start of buffer where pad bytes are to be written
 * @gcm_padding:    Length of GCM padding, in bytes
 * @hash_pad_len:   Number of bytes of padding extend data to full block
 * @auth_alg:       Authentication algorithm
 * @auth_mode:      Authentication mode
 * @total_sent:     Length inserted at end of hash pad
 * @status_padding: Number of bytes of padding to align STATUS word
 *
 * There may be three forms of pad:
 *  1. GCM pad - for GCM mode ciphers, pad to 16-byte alignment
 *  2. hash pad - pad to a block length, with 0x80 data terminator and
 *                size at the end
 *  3. STAT pad - to ensure the STAT field is 4-byte aligned
 */
void spu2_request_pad(u8 *pad_start, u32 gcm_padding, u32 hash_pad_len,
		      enum hash_alg auth_alg, enum hash_mode auth_mode,
		      unsigned int total_sent, u32 status_padding)
{
	u8 *ptr = pad_start;

	/* fix data alignent for GCM */
	if (gcm_padding > 0) {
		flow_log("  GCM: padding to 16 byte alignment: %u bytes\n",
			 gcm_padding);
		memset(ptr, 0, gcm_padding);
		ptr += gcm_padding;
	}

	if (hash_pad_len > 0) {
		/* clear the padding section */
		memset(ptr, 0, hash_pad_len);

		/* terminate the data */
		*ptr = 0x80;
		ptr += (hash_pad_len - sizeof(u64));

		/* add the size at the end as required per alg */
		if (auth_alg == HASH_ALG_MD5)
			*(u64 *)ptr = cpu_to_le64((u64)total_sent * 8);
		else		/* SHA1, SHA2-224, SHA2-256 */
			*(u64 *)ptr = cpu_to_be64((u64)total_sent * 8);
		ptr += sizeof(u64);
	}

	/* pad to a 4byte alignment for STAT */
	if (status_padding > 0) {
		flow_log("  STAT: padding to 4 byte alignment: %u bytes\n",
			 status_padding);

		memset(ptr, 0, status_padding);
		ptr += status_padding;
	}
}

/**
 * spu2_xts_tweak_in_payload() - Indicate that SPU2 does NOT place the XTS
 * tweak field in the packet payload (it uses IV instead)
 *
 * Return: 0
 */
u8 spu2_xts_tweak_in_payload(void)
{
	return 0;
}

/**
 * spu2_tx_status_len() - Return the length of the STATUS field in a SPU
 * response message.
 *
 * Return: Length of STATUS field in bytes.
 */
u8 spu2_tx_status_len(void)
{
	return SPU2_TX_STATUS_LEN;
}

/**
 * spu2_rx_status_len() - Return the length of the STATUS field in a SPU
 * response message.
 *
 * Return: Length of STATUS field in bytes.
 */
u8 spu2_rx_status_len(void)
{
	return SPU2_RX_STATUS_LEN;
}

/**
 * spu_status_process() - Process the status from a SPU response message.
 * @statp:  start of STATUS word
 *
 * Return:  0 - if status is good and response should be processed
 *         !0 - status indicates an error and response is invalid
 */
int spu2_status_process(u8 *statp)
{
	/* SPU2 status is 2 bytes by default - SPU_RX_STATUS_LEN */
	u16 status = le16_to_cpu(*(__le16 *)statp);

	if (status == 0)
		return 0;

	flow_log("rx status is %#x\n", status);
	if (status == SPU2_INVALID_ICV)
		return SPU_INVALID_ICV;

	return -EBADMSG;
}

/**
 * spu2_ccm_update_iv() - Update the IV as per the requirements for CCM mode.
 *
 * @digestsize:		Digest size of this request
 * @cipher_parms:	(pointer to) cipher parmaeters, includes IV buf & IV len
 * @assoclen:		Length of AAD data
 * @chunksize:		length of input data to be sent in this req
 * @is_encrypt:		true if this is an output/encrypt operation
 * @is_esp:		true if this is an ESP / RFC4309 operation
 *
 */
void spu2_ccm_update_iv(unsigned int digestsize,
			struct spu_cipher_parms *cipher_parms,
			unsigned int assoclen, unsigned int chunksize,
			bool is_encrypt, bool is_esp)
{
	int L;  /* size of length field, in bytes */

	/*
	 * In RFC4309 mode, L is fixed at 4 bytes; otherwise, IV from
	 * testmgr contains (L-1) in bottom 3 bits of first byte,
	 * per RFC 3610.
	 */
	if (is_esp)
		L = CCM_ESP_L_VALUE;
	else
		L = ((cipher_parms->iv_buf[0] & CCM_B0_L_PRIME) >>
		      CCM_B0_L_PRIME_SHIFT) + 1;

	/* SPU2 doesn't want these length bytes nor the first byte... */
	cipher_parms->iv_len -= (1 + L);
	memmove(cipher_parms->iv_buf, &cipher_parms->iv_buf[1],
		cipher_parms->iv_len);
}

/**
 * spu2_wordalign_padlen() - SPU2 does not require padding.
 * @data_size: length of data field in bytes
 *
 * Return: length of status field padding, in bytes (always 0 on SPU2)
 */
u32 spu2_wordalign_padlen(u32 data_size)
{
	return 0;
}
OpenPOWER on IntegriCloud