summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/intel/ixgbevf/ipsec.c
blob: c1cf540d162a89da68a516ef45defcddd2a884e4 (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
// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2018 Oracle and/or its affiliates. All rights reserved. */

#include "ixgbevf.h"
#include <net/xfrm.h>
#include <crypto/aead.h>

#define IXGBE_IPSEC_KEY_BITS  160
static const char aes_gcm_name[] = "rfc4106(gcm(aes))";

/**
 * ixgbevf_ipsec_set_pf_sa - ask the PF to set up an SA
 * @adapter: board private structure
 * @xs: xfrm info to be sent to the PF
 *
 * Returns: positive offload handle from the PF, or negative error code
 **/
static int ixgbevf_ipsec_set_pf_sa(struct ixgbevf_adapter *adapter,
				   struct xfrm_state *xs)
{
	u32 msgbuf[IXGBE_VFMAILBOX_SIZE] = { 0 };
	struct ixgbe_hw *hw = &adapter->hw;
	struct sa_mbx_msg *sam;
	int ret;

	/* send the important bits to the PF */
	sam = (struct sa_mbx_msg *)(&msgbuf[1]);
	sam->dir = xs->xso.dir;
	sam->spi = xs->id.spi;
	sam->proto = xs->id.proto;
	sam->family = xs->props.family;

	if (xs->props.family == AF_INET6)
		memcpy(sam->addr, &xs->id.daddr.a6, sizeof(xs->id.daddr.a6));
	else
		memcpy(sam->addr, &xs->id.daddr.a4, sizeof(xs->id.daddr.a4));
	memcpy(sam->key, xs->aead->alg_key, sizeof(sam->key));

	msgbuf[0] = IXGBE_VF_IPSEC_ADD;

	spin_lock_bh(&adapter->mbx_lock);

	ret = ixgbevf_write_mbx(hw, msgbuf, IXGBE_VFMAILBOX_SIZE);
	if (ret)
		goto out;

	ret = ixgbevf_poll_mbx(hw, msgbuf, 2);
	if (ret)
		goto out;

	ret = (int)msgbuf[1];
	if (msgbuf[0] & IXGBE_VT_MSGTYPE_FAILURE && ret >= 0)
		ret = -1;

out:
	spin_unlock_bh(&adapter->mbx_lock);

	return ret;
}

/**
 * ixgbevf_ipsec_del_pf_sa - ask the PF to delete an SA
 * @adapter: board private structure
 * @pfsa: sa index returned from PF when created, -1 for all
 *
 * Returns: 0 on success, or negative error code
 **/
static int ixgbevf_ipsec_del_pf_sa(struct ixgbevf_adapter *adapter, int pfsa)
{
	struct ixgbe_hw *hw = &adapter->hw;
	u32 msgbuf[2];
	int err;

	memset(msgbuf, 0, sizeof(msgbuf));
	msgbuf[0] = IXGBE_VF_IPSEC_DEL;
	msgbuf[1] = (u32)pfsa;

	spin_lock_bh(&adapter->mbx_lock);

	err = ixgbevf_write_mbx(hw, msgbuf, 2);
	if (err)
		goto out;

	err = ixgbevf_poll_mbx(hw, msgbuf, 2);
	if (err)
		goto out;

out:
	spin_unlock_bh(&adapter->mbx_lock);
	return err;
}

/**
 * ixgbevf_ipsec_restore - restore the IPsec HW settings after a reset
 * @adapter: board private structure
 *
 * Reload the HW tables from the SW tables after they've been bashed
 * by a chip reset.  While we're here, make sure any stale VF data is
 * removed, since we go through reset when num_vfs changes.
 **/
void ixgbevf_ipsec_restore(struct ixgbevf_adapter *adapter)
{
	struct ixgbevf_ipsec *ipsec = adapter->ipsec;
	struct net_device *netdev = adapter->netdev;
	int i;

	if (!(adapter->netdev->features & NETIF_F_HW_ESP))
		return;

	/* reload the Rx and Tx keys */
	for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
		struct rx_sa *r = &ipsec->rx_tbl[i];
		struct tx_sa *t = &ipsec->tx_tbl[i];
		int ret;

		if (r->used) {
			ret = ixgbevf_ipsec_set_pf_sa(adapter, r->xs);
			if (ret < 0)
				netdev_err(netdev, "reload rx_tbl[%d] failed = %d\n",
					   i, ret);
		}

		if (t->used) {
			ret = ixgbevf_ipsec_set_pf_sa(adapter, t->xs);
			if (ret < 0)
				netdev_err(netdev, "reload tx_tbl[%d] failed = %d\n",
					   i, ret);
		}
	}
}

/**
 * ixgbevf_ipsec_find_empty_idx - find the first unused security parameter index
 * @ipsec: pointer to IPsec struct
 * @rxtable: true if we need to look in the Rx table
 *
 * Returns the first unused index in either the Rx or Tx SA table
 **/
static
int ixgbevf_ipsec_find_empty_idx(struct ixgbevf_ipsec *ipsec, bool rxtable)
{
	u32 i;

	if (rxtable) {
		if (ipsec->num_rx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
			return -ENOSPC;

		/* search rx sa table */
		for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
			if (!ipsec->rx_tbl[i].used)
				return i;
		}
	} else {
		if (ipsec->num_tx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
			return -ENOSPC;

		/* search tx sa table */
		for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
			if (!ipsec->tx_tbl[i].used)
				return i;
		}
	}

	return -ENOSPC;
}

/**
 * ixgbevf_ipsec_find_rx_state - find the state that matches
 * @ipsec: pointer to IPsec struct
 * @daddr: inbound address to match
 * @proto: protocol to match
 * @spi: SPI to match
 * @ip4: true if using an IPv4 address
 *
 * Returns a pointer to the matching SA state information
 **/
static
struct xfrm_state *ixgbevf_ipsec_find_rx_state(struct ixgbevf_ipsec *ipsec,
					       __be32 *daddr, u8 proto,
					       __be32 spi, bool ip4)
{
	struct xfrm_state *ret = NULL;
	struct rx_sa *rsa;

	rcu_read_lock();
	hash_for_each_possible_rcu(ipsec->rx_sa_list, rsa, hlist,
				   (__force u32)spi) {
		if (spi == rsa->xs->id.spi &&
		    ((ip4 && *daddr == rsa->xs->id.daddr.a4) ||
		      (!ip4 && !memcmp(daddr, &rsa->xs->id.daddr.a6,
				       sizeof(rsa->xs->id.daddr.a6)))) &&
		    proto == rsa->xs->id.proto) {
			ret = rsa->xs;
			xfrm_state_hold(ret);
			break;
		}
	}
	rcu_read_unlock();
	return ret;
}

/**
 * ixgbevf_ipsec_parse_proto_keys - find the key and salt based on the protocol
 * @xs: pointer to xfrm_state struct
 * @mykey: pointer to key array to populate
 * @mysalt: pointer to salt value to populate
 *
 * This copies the protocol keys and salt to our own data tables.  The
 * 82599 family only supports the one algorithm.
 **/
static int ixgbevf_ipsec_parse_proto_keys(struct xfrm_state *xs,
					  u32 *mykey, u32 *mysalt)
{
	struct net_device *dev = xs->xso.real_dev;
	unsigned char *key_data;
	char *alg_name = NULL;
	int key_len;

	if (!xs->aead) {
		netdev_err(dev, "Unsupported IPsec algorithm\n");
		return -EINVAL;
	}

	if (xs->aead->alg_icv_len != IXGBE_IPSEC_AUTH_BITS) {
		netdev_err(dev, "IPsec offload requires %d bit authentication\n",
			   IXGBE_IPSEC_AUTH_BITS);
		return -EINVAL;
	}

	key_data = &xs->aead->alg_key[0];
	key_len = xs->aead->alg_key_len;
	alg_name = xs->aead->alg_name;

	if (strcmp(alg_name, aes_gcm_name)) {
		netdev_err(dev, "Unsupported IPsec algorithm - please use %s\n",
			   aes_gcm_name);
		return -EINVAL;
	}

	/* The key bytes come down in a big endian array of bytes, so
	 * we don't need to do any byte swapping.
	 * 160 accounts for 16 byte key and 4 byte salt
	 */
	if (key_len > IXGBE_IPSEC_KEY_BITS) {
		*mysalt = ((u32 *)key_data)[4];
	} else if (key_len == IXGBE_IPSEC_KEY_BITS) {
		*mysalt = 0;
	} else {
		netdev_err(dev, "IPsec hw offload only supports keys up to 128 bits with a 32 bit salt\n");
		return -EINVAL;
	}
	memcpy(mykey, key_data, 16);

	return 0;
}

/**
 * ixgbevf_ipsec_add_sa - program device with a security association
 * @xs: pointer to transformer state struct
 **/
static int ixgbevf_ipsec_add_sa(struct xfrm_state *xs)
{
	struct net_device *dev = xs->xso.real_dev;
	struct ixgbevf_adapter *adapter;
	struct ixgbevf_ipsec *ipsec;
	u16 sa_idx;
	int ret;

	adapter = netdev_priv(dev);
	ipsec = adapter->ipsec;

	if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
		netdev_err(dev, "Unsupported protocol 0x%04x for IPsec offload\n",
			   xs->id.proto);
		return -EINVAL;
	}

	if (xs->props.mode != XFRM_MODE_TRANSPORT) {
		netdev_err(dev, "Unsupported mode for ipsec offload\n");
		return -EINVAL;
	}

	if (xs->xso.type != XFRM_DEV_OFFLOAD_CRYPTO) {
		netdev_err(dev, "Unsupported ipsec offload type\n");
		return -EINVAL;
	}

	if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
		struct rx_sa rsa;

		if (xs->calg) {
			netdev_err(dev, "Compression offload not supported\n");
			return -EINVAL;
		}

		/* find the first unused index */
		ret = ixgbevf_ipsec_find_empty_idx(ipsec, true);
		if (ret < 0) {
			netdev_err(dev, "No space for SA in Rx table!\n");
			return ret;
		}
		sa_idx = (u16)ret;

		memset(&rsa, 0, sizeof(rsa));
		rsa.used = true;
		rsa.xs = xs;

		if (rsa.xs->id.proto & IPPROTO_ESP)
			rsa.decrypt = xs->ealg || xs->aead;

		/* get the key and salt */
		ret = ixgbevf_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
		if (ret) {
			netdev_err(dev, "Failed to get key data for Rx SA table\n");
			return ret;
		}

		/* get ip for rx sa table */
		if (xs->props.family == AF_INET6)
			memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
		else
			memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);

		rsa.mode = IXGBE_RXMOD_VALID;
		if (rsa.xs->id.proto & IPPROTO_ESP)
			rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
		if (rsa.decrypt)
			rsa.mode |= IXGBE_RXMOD_DECRYPT;
		if (rsa.xs->props.family == AF_INET6)
			rsa.mode |= IXGBE_RXMOD_IPV6;

		ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
		if (ret < 0)
			return ret;
		rsa.pfsa = ret;

		/* the preparations worked, so save the info */
		memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));

		xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;

		ipsec->num_rx_sa++;

		/* hash the new entry for faster search in Rx path */
		hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
			     (__force u32)rsa.xs->id.spi);
	} else {
		struct tx_sa tsa;

		/* find the first unused index */
		ret = ixgbevf_ipsec_find_empty_idx(ipsec, false);
		if (ret < 0) {
			netdev_err(dev, "No space for SA in Tx table\n");
			return ret;
		}
		sa_idx = (u16)ret;

		memset(&tsa, 0, sizeof(tsa));
		tsa.used = true;
		tsa.xs = xs;

		if (xs->id.proto & IPPROTO_ESP)
			tsa.encrypt = xs->ealg || xs->aead;

		ret = ixgbevf_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
		if (ret) {
			netdev_err(dev, "Failed to get key data for Tx SA table\n");
			memset(&tsa, 0, sizeof(tsa));
			return ret;
		}

		ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
		if (ret < 0)
			return ret;
		tsa.pfsa = ret;

		/* the preparations worked, so save the info */
		memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));

		xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;

		ipsec->num_tx_sa++;
	}

	return 0;
}

/**
 * ixgbevf_ipsec_del_sa - clear out this specific SA
 * @xs: pointer to transformer state struct
 **/
static void ixgbevf_ipsec_del_sa(struct xfrm_state *xs)
{
	struct net_device *dev = xs->xso.real_dev;
	struct ixgbevf_adapter *adapter;
	struct ixgbevf_ipsec *ipsec;
	u16 sa_idx;

	adapter = netdev_priv(dev);
	ipsec = adapter->ipsec;

	if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
		sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;

		if (!ipsec->rx_tbl[sa_idx].used) {
			netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
				   sa_idx, xs->xso.offload_handle);
			return;
		}

		ixgbevf_ipsec_del_pf_sa(adapter, ipsec->rx_tbl[sa_idx].pfsa);
		hash_del_rcu(&ipsec->rx_tbl[sa_idx].hlist);
		memset(&ipsec->rx_tbl[sa_idx], 0, sizeof(struct rx_sa));
		ipsec->num_rx_sa--;
	} else {
		sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;

		if (!ipsec->tx_tbl[sa_idx].used) {
			netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
				   sa_idx, xs->xso.offload_handle);
			return;
		}

		ixgbevf_ipsec_del_pf_sa(adapter, ipsec->tx_tbl[sa_idx].pfsa);
		memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
		ipsec->num_tx_sa--;
	}
}

/**
 * ixgbevf_ipsec_offload_ok - can this packet use the xfrm hw offload
 * @skb: current data packet
 * @xs: pointer to transformer state struct
 **/
static bool ixgbevf_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
{
	if (xs->props.family == AF_INET) {
		/* Offload with IPv4 options is not supported yet */
		if (ip_hdr(skb)->ihl != 5)
			return false;
	} else {
		/* Offload with IPv6 extension headers is not support yet */
		if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
			return false;
	}

	return true;
}

static const struct xfrmdev_ops ixgbevf_xfrmdev_ops = {
	.xdo_dev_state_add = ixgbevf_ipsec_add_sa,
	.xdo_dev_state_delete = ixgbevf_ipsec_del_sa,
	.xdo_dev_offload_ok = ixgbevf_ipsec_offload_ok,
};

/**
 * ixgbevf_ipsec_tx - setup Tx flags for IPsec offload
 * @tx_ring: outgoing context
 * @first: current data packet
 * @itd: ipsec Tx data for later use in building context descriptor
 **/
int ixgbevf_ipsec_tx(struct ixgbevf_ring *tx_ring,
		     struct ixgbevf_tx_buffer *first,
		     struct ixgbevf_ipsec_tx_data *itd)
{
	struct ixgbevf_adapter *adapter = netdev_priv(tx_ring->netdev);
	struct ixgbevf_ipsec *ipsec = adapter->ipsec;
	struct xfrm_state *xs;
	struct sec_path *sp;
	struct tx_sa *tsa;
	u16 sa_idx;

	sp = skb_sec_path(first->skb);
	if (unlikely(!sp->len)) {
		netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
			   __func__, sp->len);
		return 0;
	}

	xs = xfrm_input_state(first->skb);
	if (unlikely(!xs)) {
		netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
			   __func__, xs);
		return 0;
	}

	sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
	if (unlikely(sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
		netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
			   __func__, sa_idx, xs->xso.offload_handle);
		return 0;
	}

	tsa = &ipsec->tx_tbl[sa_idx];
	if (unlikely(!tsa->used)) {
		netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
			   __func__, sa_idx);
		return 0;
	}

	itd->pfsa = tsa->pfsa - IXGBE_IPSEC_BASE_TX_INDEX;

	first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CSUM;

	if (xs->id.proto == IPPROTO_ESP) {
		itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
			      IXGBE_ADVTXD_TUCMD_L4T_TCP;
		if (first->protocol == htons(ETH_P_IP))
			itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;

		/* The actual trailer length is authlen (16 bytes) plus
		 * 2 bytes for the proto and the padlen values, plus
		 * padlen bytes of padding.  This ends up not the same
		 * as the static value found in xs->props.trailer_len (21).
		 *
		 * ... but if we're doing GSO, don't bother as the stack
		 * doesn't add a trailer for those.
		 */
		if (!skb_is_gso(first->skb)) {
			/* The "correct" way to get the auth length would be
			 * to use
			 *    authlen = crypto_aead_authsize(xs->data);
			 * but since we know we only have one size to worry
			 * about * we can let the compiler use the constant
			 * and save us a few CPU cycles.
			 */
			const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
			struct sk_buff *skb = first->skb;
			u8 padlen;
			int ret;

			ret = skb_copy_bits(skb, skb->len - (authlen + 2),
					    &padlen, 1);
			if (unlikely(ret))
				return 0;
			itd->trailer_len = authlen + 2 + padlen;
		}
	}
	if (tsa->encrypt)
		itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;

	return 1;
}

/**
 * ixgbevf_ipsec_rx - decode IPsec bits from Rx descriptor
 * @rx_ring: receiving ring
 * @rx_desc: receive data descriptor
 * @skb: current data packet
 *
 * Determine if there was an IPsec encapsulation noticed, and if so set up
 * the resulting status for later in the receive stack.
 **/
void ixgbevf_ipsec_rx(struct ixgbevf_ring *rx_ring,
		      union ixgbe_adv_rx_desc *rx_desc,
		      struct sk_buff *skb)
{
	struct ixgbevf_adapter *adapter = netdev_priv(rx_ring->netdev);
	__le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
	__le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
					     IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
	struct ixgbevf_ipsec *ipsec = adapter->ipsec;
	struct xfrm_offload *xo = NULL;
	struct xfrm_state *xs = NULL;
	struct ipv6hdr *ip6 = NULL;
	struct iphdr *ip4 = NULL;
	struct sec_path *sp;
	void *daddr;
	__be32 spi;
	u8 *c_hdr;
	u8 proto;

	/* Find the IP and crypto headers in the data.
	 * We can assume no VLAN header in the way, b/c the
	 * hw won't recognize the IPsec packet and anyway the
	 * currently VLAN device doesn't support xfrm offload.
	 */
	if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
		ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
		daddr = &ip4->daddr;
		c_hdr = (u8 *)ip4 + ip4->ihl * 4;
	} else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
		ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
		daddr = &ip6->daddr;
		c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
	} else {
		return;
	}

	switch (pkt_info & ipsec_pkt_types) {
	case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
		spi = ((struct ip_auth_hdr *)c_hdr)->spi;
		proto = IPPROTO_AH;
		break;
	case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
		spi = ((struct ip_esp_hdr *)c_hdr)->spi;
		proto = IPPROTO_ESP;
		break;
	default:
		return;
	}

	xs = ixgbevf_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
	if (unlikely(!xs))
		return;

	sp = secpath_set(skb);
	if (unlikely(!sp))
		return;

	sp->xvec[sp->len++] = xs;
	sp->olen++;
	xo = xfrm_offload(skb);
	xo->flags = CRYPTO_DONE;
	xo->status = CRYPTO_SUCCESS;

	adapter->rx_ipsec++;
}

/**
 * ixgbevf_init_ipsec_offload - initialize registers for IPsec operation
 * @adapter: board private structure
 **/
void ixgbevf_init_ipsec_offload(struct ixgbevf_adapter *adapter)
{
	struct ixgbevf_ipsec *ipsec;
	size_t size;

	switch (adapter->hw.api_version) {
	case ixgbe_mbox_api_14:
	case ixgbe_mbox_api_15:
		break;
	default:
		return;
	}

	ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
	if (!ipsec)
		goto err1;
	hash_init(ipsec->rx_sa_list);

	size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
	ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
	if (!ipsec->rx_tbl)
		goto err2;

	size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
	ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
	if (!ipsec->tx_tbl)
		goto err2;

	ipsec->num_rx_sa = 0;
	ipsec->num_tx_sa = 0;

	adapter->ipsec = ipsec;

	adapter->netdev->xfrmdev_ops = &ixgbevf_xfrmdev_ops;

#define IXGBEVF_ESP_FEATURES	(NETIF_F_HW_ESP | \
				 NETIF_F_HW_ESP_TX_CSUM | \
				 NETIF_F_GSO_ESP)

	adapter->netdev->features |= IXGBEVF_ESP_FEATURES;
	adapter->netdev->hw_enc_features |= IXGBEVF_ESP_FEATURES;

	return;

err2:
	kfree(ipsec->rx_tbl);
	kfree(ipsec->tx_tbl);
	kfree(ipsec);
err1:
	netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
}

/**
 * ixgbevf_stop_ipsec_offload - tear down the IPsec offload
 * @adapter: board private structure
 **/
void ixgbevf_stop_ipsec_offload(struct ixgbevf_adapter *adapter)
{
	struct ixgbevf_ipsec *ipsec = adapter->ipsec;

	adapter->ipsec = NULL;
	if (ipsec) {
		kfree(ipsec->rx_tbl);
		kfree(ipsec->tx_tbl);
		kfree(ipsec);
	}
}