1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2018 Oracle and/or its affiliates. All rights reserved. */
3
4 #include "ixgbevf.h"
5 #include <net/xfrm.h>
6 #include <crypto/aead.h>
7
8 #define IXGBE_IPSEC_KEY_BITS 160
9 static const char aes_gcm_name[] = "rfc4106(gcm(aes))";
10
11 /**
12 * ixgbevf_ipsec_set_pf_sa - ask the PF to set up an SA
13 * @adapter: board private structure
14 * @xs: xfrm info to be sent to the PF
15 *
16 * Returns: positive offload handle from the PF, or negative error code
17 **/
ixgbevf_ipsec_set_pf_sa(struct ixgbevf_adapter * adapter,struct xfrm_state * xs)18 static int ixgbevf_ipsec_set_pf_sa(struct ixgbevf_adapter *adapter,
19 struct xfrm_state *xs)
20 {
21 u32 msgbuf[IXGBE_VFMAILBOX_SIZE] = { 0 };
22 struct ixgbe_hw *hw = &adapter->hw;
23 struct sa_mbx_msg *sam;
24 int ret;
25
26 /* send the important bits to the PF */
27 sam = (struct sa_mbx_msg *)(&msgbuf[1]);
28 sam->flags = xs->xso.flags;
29 sam->spi = xs->id.spi;
30 sam->proto = xs->id.proto;
31 sam->family = xs->props.family;
32
33 if (xs->props.family == AF_INET6)
34 memcpy(sam->addr, &xs->id.daddr.a6, sizeof(xs->id.daddr.a6));
35 else
36 memcpy(sam->addr, &xs->id.daddr.a4, sizeof(xs->id.daddr.a4));
37 memcpy(sam->key, xs->aead->alg_key, sizeof(sam->key));
38
39 msgbuf[0] = IXGBE_VF_IPSEC_ADD;
40
41 spin_lock_bh(&adapter->mbx_lock);
42
43 ret = hw->mbx.ops.write_posted(hw, msgbuf, IXGBE_VFMAILBOX_SIZE);
44 if (ret)
45 goto out;
46
47 ret = hw->mbx.ops.read_posted(hw, msgbuf, 2);
48 if (ret)
49 goto out;
50
51 ret = (int)msgbuf[1];
52 if (msgbuf[0] & IXGBE_VT_MSGTYPE_NACK && ret >= 0)
53 ret = -1;
54
55 out:
56 spin_unlock_bh(&adapter->mbx_lock);
57
58 return ret;
59 }
60
61 /**
62 * ixgbevf_ipsec_del_pf_sa - ask the PF to delete an SA
63 * @adapter: board private structure
64 * @pfsa: sa index returned from PF when created, -1 for all
65 *
66 * Returns: 0 on success, or negative error code
67 **/
ixgbevf_ipsec_del_pf_sa(struct ixgbevf_adapter * adapter,int pfsa)68 static int ixgbevf_ipsec_del_pf_sa(struct ixgbevf_adapter *adapter, int pfsa)
69 {
70 struct ixgbe_hw *hw = &adapter->hw;
71 u32 msgbuf[2];
72 int err;
73
74 memset(msgbuf, 0, sizeof(msgbuf));
75 msgbuf[0] = IXGBE_VF_IPSEC_DEL;
76 msgbuf[1] = (u32)pfsa;
77
78 spin_lock_bh(&adapter->mbx_lock);
79
80 err = hw->mbx.ops.write_posted(hw, msgbuf, 2);
81 if (err)
82 goto out;
83
84 err = hw->mbx.ops.read_posted(hw, msgbuf, 2);
85 if (err)
86 goto out;
87
88 out:
89 spin_unlock_bh(&adapter->mbx_lock);
90 return err;
91 }
92
93 /**
94 * ixgbevf_ipsec_restore - restore the IPsec HW settings after a reset
95 * @adapter: board private structure
96 *
97 * Reload the HW tables from the SW tables after they've been bashed
98 * by a chip reset. While we're here, make sure any stale VF data is
99 * removed, since we go through reset when num_vfs changes.
100 **/
ixgbevf_ipsec_restore(struct ixgbevf_adapter * adapter)101 void ixgbevf_ipsec_restore(struct ixgbevf_adapter *adapter)
102 {
103 struct ixgbevf_ipsec *ipsec = adapter->ipsec;
104 struct net_device *netdev = adapter->netdev;
105 int i;
106
107 if (!(adapter->netdev->features & NETIF_F_HW_ESP))
108 return;
109
110 /* reload the Rx and Tx keys */
111 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
112 struct rx_sa *r = &ipsec->rx_tbl[i];
113 struct tx_sa *t = &ipsec->tx_tbl[i];
114 int ret;
115
116 if (r->used) {
117 ret = ixgbevf_ipsec_set_pf_sa(adapter, r->xs);
118 if (ret < 0)
119 netdev_err(netdev, "reload rx_tbl[%d] failed = %d\n",
120 i, ret);
121 }
122
123 if (t->used) {
124 ret = ixgbevf_ipsec_set_pf_sa(adapter, t->xs);
125 if (ret < 0)
126 netdev_err(netdev, "reload tx_tbl[%d] failed = %d\n",
127 i, ret);
128 }
129 }
130 }
131
132 /**
133 * ixgbevf_ipsec_find_empty_idx - find the first unused security parameter index
134 * @ipsec: pointer to IPsec struct
135 * @rxtable: true if we need to look in the Rx table
136 *
137 * Returns the first unused index in either the Rx or Tx SA table
138 **/
139 static
ixgbevf_ipsec_find_empty_idx(struct ixgbevf_ipsec * ipsec,bool rxtable)140 int ixgbevf_ipsec_find_empty_idx(struct ixgbevf_ipsec *ipsec, bool rxtable)
141 {
142 u32 i;
143
144 if (rxtable) {
145 if (ipsec->num_rx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
146 return -ENOSPC;
147
148 /* search rx sa table */
149 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
150 if (!ipsec->rx_tbl[i].used)
151 return i;
152 }
153 } else {
154 if (ipsec->num_tx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
155 return -ENOSPC;
156
157 /* search tx sa table */
158 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
159 if (!ipsec->tx_tbl[i].used)
160 return i;
161 }
162 }
163
164 return -ENOSPC;
165 }
166
167 /**
168 * ixgbevf_ipsec_find_rx_state - find the state that matches
169 * @ipsec: pointer to IPsec struct
170 * @daddr: inbound address to match
171 * @proto: protocol to match
172 * @spi: SPI to match
173 * @ip4: true if using an IPv4 address
174 *
175 * Returns a pointer to the matching SA state information
176 **/
177 static
ixgbevf_ipsec_find_rx_state(struct ixgbevf_ipsec * ipsec,__be32 * daddr,u8 proto,__be32 spi,bool ip4)178 struct xfrm_state *ixgbevf_ipsec_find_rx_state(struct ixgbevf_ipsec *ipsec,
179 __be32 *daddr, u8 proto,
180 __be32 spi, bool ip4)
181 {
182 struct xfrm_state *ret = NULL;
183 struct rx_sa *rsa;
184
185 rcu_read_lock();
186 hash_for_each_possible_rcu(ipsec->rx_sa_list, rsa, hlist,
187 (__force u32)spi) {
188 if (spi == rsa->xs->id.spi &&
189 ((ip4 && *daddr == rsa->xs->id.daddr.a4) ||
190 (!ip4 && !memcmp(daddr, &rsa->xs->id.daddr.a6,
191 sizeof(rsa->xs->id.daddr.a6)))) &&
192 proto == rsa->xs->id.proto) {
193 ret = rsa->xs;
194 xfrm_state_hold(ret);
195 break;
196 }
197 }
198 rcu_read_unlock();
199 return ret;
200 }
201
202 /**
203 * ixgbevf_ipsec_parse_proto_keys - find the key and salt based on the protocol
204 * @xs: pointer to xfrm_state struct
205 * @mykey: pointer to key array to populate
206 * @mysalt: pointer to salt value to populate
207 *
208 * This copies the protocol keys and salt to our own data tables. The
209 * 82599 family only supports the one algorithm.
210 **/
ixgbevf_ipsec_parse_proto_keys(struct xfrm_state * xs,u32 * mykey,u32 * mysalt)211 static int ixgbevf_ipsec_parse_proto_keys(struct xfrm_state *xs,
212 u32 *mykey, u32 *mysalt)
213 {
214 struct net_device *dev = xs->xso.dev;
215 unsigned char *key_data;
216 char *alg_name = NULL;
217 int key_len;
218
219 if (!xs->aead) {
220 netdev_err(dev, "Unsupported IPsec algorithm\n");
221 return -EINVAL;
222 }
223
224 if (xs->aead->alg_icv_len != IXGBE_IPSEC_AUTH_BITS) {
225 netdev_err(dev, "IPsec offload requires %d bit authentication\n",
226 IXGBE_IPSEC_AUTH_BITS);
227 return -EINVAL;
228 }
229
230 key_data = &xs->aead->alg_key[0];
231 key_len = xs->aead->alg_key_len;
232 alg_name = xs->aead->alg_name;
233
234 if (strcmp(alg_name, aes_gcm_name)) {
235 netdev_err(dev, "Unsupported IPsec algorithm - please use %s\n",
236 aes_gcm_name);
237 return -EINVAL;
238 }
239
240 /* The key bytes come down in a big endian array of bytes, so
241 * we don't need to do any byte swapping.
242 * 160 accounts for 16 byte key and 4 byte salt
243 */
244 if (key_len > IXGBE_IPSEC_KEY_BITS) {
245 *mysalt = ((u32 *)key_data)[4];
246 } else if (key_len == IXGBE_IPSEC_KEY_BITS) {
247 *mysalt = 0;
248 } else {
249 netdev_err(dev, "IPsec hw offload only supports keys up to 128 bits with a 32 bit salt\n");
250 return -EINVAL;
251 }
252 memcpy(mykey, key_data, 16);
253
254 return 0;
255 }
256
257 /**
258 * ixgbevf_ipsec_add_sa - program device with a security association
259 * @xs: pointer to transformer state struct
260 **/
ixgbevf_ipsec_add_sa(struct xfrm_state * xs)261 static int ixgbevf_ipsec_add_sa(struct xfrm_state *xs)
262 {
263 struct net_device *dev = xs->xso.dev;
264 struct ixgbevf_adapter *adapter = netdev_priv(dev);
265 struct ixgbevf_ipsec *ipsec = adapter->ipsec;
266 u16 sa_idx;
267 int ret;
268
269 if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
270 netdev_err(dev, "Unsupported protocol 0x%04x for IPsec offload\n",
271 xs->id.proto);
272 return -EINVAL;
273 }
274
275 if (xs->props.mode != XFRM_MODE_TRANSPORT) {
276 netdev_err(dev, "Unsupported mode for ipsec offload\n");
277 return -EINVAL;
278 }
279
280 if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
281 struct rx_sa rsa;
282
283 if (xs->calg) {
284 netdev_err(dev, "Compression offload not supported\n");
285 return -EINVAL;
286 }
287
288 /* find the first unused index */
289 ret = ixgbevf_ipsec_find_empty_idx(ipsec, true);
290 if (ret < 0) {
291 netdev_err(dev, "No space for SA in Rx table!\n");
292 return ret;
293 }
294 sa_idx = (u16)ret;
295
296 memset(&rsa, 0, sizeof(rsa));
297 rsa.used = true;
298 rsa.xs = xs;
299
300 if (rsa.xs->id.proto & IPPROTO_ESP)
301 rsa.decrypt = xs->ealg || xs->aead;
302
303 /* get the key and salt */
304 ret = ixgbevf_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
305 if (ret) {
306 netdev_err(dev, "Failed to get key data for Rx SA table\n");
307 return ret;
308 }
309
310 /* get ip for rx sa table */
311 if (xs->props.family == AF_INET6)
312 memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
313 else
314 memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
315
316 rsa.mode = IXGBE_RXMOD_VALID;
317 if (rsa.xs->id.proto & IPPROTO_ESP)
318 rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
319 if (rsa.decrypt)
320 rsa.mode |= IXGBE_RXMOD_DECRYPT;
321 if (rsa.xs->props.family == AF_INET6)
322 rsa.mode |= IXGBE_RXMOD_IPV6;
323
324 ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
325 if (ret < 0)
326 return ret;
327 rsa.pfsa = ret;
328
329 /* the preparations worked, so save the info */
330 memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
331
332 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
333
334 ipsec->num_rx_sa++;
335
336 /* hash the new entry for faster search in Rx path */
337 hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
338 (__force u32)rsa.xs->id.spi);
339 } else {
340 struct tx_sa tsa;
341
342 /* find the first unused index */
343 ret = ixgbevf_ipsec_find_empty_idx(ipsec, false);
344 if (ret < 0) {
345 netdev_err(dev, "No space for SA in Tx table\n");
346 return ret;
347 }
348 sa_idx = (u16)ret;
349
350 memset(&tsa, 0, sizeof(tsa));
351 tsa.used = true;
352 tsa.xs = xs;
353
354 if (xs->id.proto & IPPROTO_ESP)
355 tsa.encrypt = xs->ealg || xs->aead;
356
357 ret = ixgbevf_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
358 if (ret) {
359 netdev_err(dev, "Failed to get key data for Tx SA table\n");
360 memset(&tsa, 0, sizeof(tsa));
361 return ret;
362 }
363
364 ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
365 if (ret < 0)
366 return ret;
367 tsa.pfsa = ret;
368
369 /* the preparations worked, so save the info */
370 memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
371
372 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
373
374 ipsec->num_tx_sa++;
375 }
376
377 return 0;
378 }
379
380 /**
381 * ixgbevf_ipsec_del_sa - clear out this specific SA
382 * @xs: pointer to transformer state struct
383 **/
ixgbevf_ipsec_del_sa(struct xfrm_state * xs)384 static void ixgbevf_ipsec_del_sa(struct xfrm_state *xs)
385 {
386 struct net_device *dev = xs->xso.dev;
387 struct ixgbevf_adapter *adapter = netdev_priv(dev);
388 struct ixgbevf_ipsec *ipsec = adapter->ipsec;
389 u16 sa_idx;
390
391 if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
392 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
393
394 if (!ipsec->rx_tbl[sa_idx].used) {
395 netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
396 sa_idx, xs->xso.offload_handle);
397 return;
398 }
399
400 ixgbevf_ipsec_del_pf_sa(adapter, ipsec->rx_tbl[sa_idx].pfsa);
401 hash_del_rcu(&ipsec->rx_tbl[sa_idx].hlist);
402 memset(&ipsec->rx_tbl[sa_idx], 0, sizeof(struct rx_sa));
403 ipsec->num_rx_sa--;
404 } else {
405 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
406
407 if (!ipsec->tx_tbl[sa_idx].used) {
408 netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
409 sa_idx, xs->xso.offload_handle);
410 return;
411 }
412
413 ixgbevf_ipsec_del_pf_sa(adapter, ipsec->tx_tbl[sa_idx].pfsa);
414 memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
415 ipsec->num_tx_sa--;
416 }
417 }
418
419 /**
420 * ixgbevf_ipsec_offload_ok - can this packet use the xfrm hw offload
421 * @skb: current data packet
422 * @xs: pointer to transformer state struct
423 **/
ixgbevf_ipsec_offload_ok(struct sk_buff * skb,struct xfrm_state * xs)424 static bool ixgbevf_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
425 {
426 if (xs->props.family == AF_INET) {
427 /* Offload with IPv4 options is not supported yet */
428 if (ip_hdr(skb)->ihl != 5)
429 return false;
430 } else {
431 /* Offload with IPv6 extension headers is not support yet */
432 if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
433 return false;
434 }
435
436 return true;
437 }
438
439 static const struct xfrmdev_ops ixgbevf_xfrmdev_ops = {
440 .xdo_dev_state_add = ixgbevf_ipsec_add_sa,
441 .xdo_dev_state_delete = ixgbevf_ipsec_del_sa,
442 .xdo_dev_offload_ok = ixgbevf_ipsec_offload_ok,
443 };
444
445 /**
446 * ixgbevf_ipsec_tx - setup Tx flags for IPsec offload
447 * @tx_ring: outgoing context
448 * @first: current data packet
449 * @itd: ipsec Tx data for later use in building context descriptor
450 **/
ixgbevf_ipsec_tx(struct ixgbevf_ring * tx_ring,struct ixgbevf_tx_buffer * first,struct ixgbevf_ipsec_tx_data * itd)451 int ixgbevf_ipsec_tx(struct ixgbevf_ring *tx_ring,
452 struct ixgbevf_tx_buffer *first,
453 struct ixgbevf_ipsec_tx_data *itd)
454 {
455 struct ixgbevf_adapter *adapter = netdev_priv(tx_ring->netdev);
456 struct ixgbevf_ipsec *ipsec = adapter->ipsec;
457 struct xfrm_state *xs;
458 struct sec_path *sp;
459 struct tx_sa *tsa;
460 u16 sa_idx;
461
462 sp = skb_sec_path(first->skb);
463 if (unlikely(!sp->len)) {
464 netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
465 __func__, sp->len);
466 return 0;
467 }
468
469 xs = xfrm_input_state(first->skb);
470 if (unlikely(!xs)) {
471 netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
472 __func__, xs);
473 return 0;
474 }
475
476 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
477 if (unlikely(sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
478 netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
479 __func__, sa_idx, xs->xso.offload_handle);
480 return 0;
481 }
482
483 tsa = &ipsec->tx_tbl[sa_idx];
484 if (unlikely(!tsa->used)) {
485 netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
486 __func__, sa_idx);
487 return 0;
488 }
489
490 itd->pfsa = tsa->pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
491
492 first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CSUM;
493
494 if (xs->id.proto == IPPROTO_ESP) {
495 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
496 IXGBE_ADVTXD_TUCMD_L4T_TCP;
497 if (first->protocol == htons(ETH_P_IP))
498 itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
499
500 /* The actual trailer length is authlen (16 bytes) plus
501 * 2 bytes for the proto and the padlen values, plus
502 * padlen bytes of padding. This ends up not the same
503 * as the static value found in xs->props.trailer_len (21).
504 *
505 * ... but if we're doing GSO, don't bother as the stack
506 * doesn't add a trailer for those.
507 */
508 if (!skb_is_gso(first->skb)) {
509 /* The "correct" way to get the auth length would be
510 * to use
511 * authlen = crypto_aead_authsize(xs->data);
512 * but since we know we only have one size to worry
513 * about * we can let the compiler use the constant
514 * and save us a few CPU cycles.
515 */
516 const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
517 struct sk_buff *skb = first->skb;
518 u8 padlen;
519 int ret;
520
521 ret = skb_copy_bits(skb, skb->len - (authlen + 2),
522 &padlen, 1);
523 if (unlikely(ret))
524 return 0;
525 itd->trailer_len = authlen + 2 + padlen;
526 }
527 }
528 if (tsa->encrypt)
529 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
530
531 return 1;
532 }
533
534 /**
535 * ixgbevf_ipsec_rx - decode IPsec bits from Rx descriptor
536 * @rx_ring: receiving ring
537 * @rx_desc: receive data descriptor
538 * @skb: current data packet
539 *
540 * Determine if there was an IPsec encapsulation noticed, and if so set up
541 * the resulting status for later in the receive stack.
542 **/
ixgbevf_ipsec_rx(struct ixgbevf_ring * rx_ring,union ixgbe_adv_rx_desc * rx_desc,struct sk_buff * skb)543 void ixgbevf_ipsec_rx(struct ixgbevf_ring *rx_ring,
544 union ixgbe_adv_rx_desc *rx_desc,
545 struct sk_buff *skb)
546 {
547 struct ixgbevf_adapter *adapter = netdev_priv(rx_ring->netdev);
548 __le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
549 __le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
550 IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
551 struct ixgbevf_ipsec *ipsec = adapter->ipsec;
552 struct xfrm_offload *xo = NULL;
553 struct xfrm_state *xs = NULL;
554 struct ipv6hdr *ip6 = NULL;
555 struct iphdr *ip4 = NULL;
556 struct sec_path *sp;
557 void *daddr;
558 __be32 spi;
559 u8 *c_hdr;
560 u8 proto;
561
562 /* Find the IP and crypto headers in the data.
563 * We can assume no VLAN header in the way, b/c the
564 * hw won't recognize the IPsec packet and anyway the
565 * currently VLAN device doesn't support xfrm offload.
566 */
567 if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
568 ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
569 daddr = &ip4->daddr;
570 c_hdr = (u8 *)ip4 + ip4->ihl * 4;
571 } else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
572 ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
573 daddr = &ip6->daddr;
574 c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
575 } else {
576 return;
577 }
578
579 switch (pkt_info & ipsec_pkt_types) {
580 case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
581 spi = ((struct ip_auth_hdr *)c_hdr)->spi;
582 proto = IPPROTO_AH;
583 break;
584 case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
585 spi = ((struct ip_esp_hdr *)c_hdr)->spi;
586 proto = IPPROTO_ESP;
587 break;
588 default:
589 return;
590 }
591
592 xs = ixgbevf_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
593 if (unlikely(!xs))
594 return;
595
596 sp = secpath_set(skb);
597 if (unlikely(!sp))
598 return;
599
600 sp->xvec[sp->len++] = xs;
601 sp->olen++;
602 xo = xfrm_offload(skb);
603 xo->flags = CRYPTO_DONE;
604 xo->status = CRYPTO_SUCCESS;
605
606 adapter->rx_ipsec++;
607 }
608
609 /**
610 * ixgbevf_init_ipsec_offload - initialize registers for IPsec operation
611 * @adapter: board private structure
612 **/
ixgbevf_init_ipsec_offload(struct ixgbevf_adapter * adapter)613 void ixgbevf_init_ipsec_offload(struct ixgbevf_adapter *adapter)
614 {
615 struct ixgbevf_ipsec *ipsec;
616 size_t size;
617
618 switch (adapter->hw.api_version) {
619 case ixgbe_mbox_api_14:
620 break;
621 default:
622 return;
623 }
624
625 ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
626 if (!ipsec)
627 goto err1;
628 hash_init(ipsec->rx_sa_list);
629
630 size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
631 ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
632 if (!ipsec->rx_tbl)
633 goto err2;
634
635 size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
636 ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
637 if (!ipsec->tx_tbl)
638 goto err2;
639
640 ipsec->num_rx_sa = 0;
641 ipsec->num_tx_sa = 0;
642
643 adapter->ipsec = ipsec;
644
645 adapter->netdev->xfrmdev_ops = &ixgbevf_xfrmdev_ops;
646
647 #define IXGBEVF_ESP_FEATURES (NETIF_F_HW_ESP | \
648 NETIF_F_HW_ESP_TX_CSUM | \
649 NETIF_F_GSO_ESP)
650
651 adapter->netdev->features |= IXGBEVF_ESP_FEATURES;
652 adapter->netdev->hw_enc_features |= IXGBEVF_ESP_FEATURES;
653
654 return;
655
656 err2:
657 kfree(ipsec->rx_tbl);
658 kfree(ipsec->tx_tbl);
659 kfree(ipsec);
660 err1:
661 netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
662 }
663
664 /**
665 * ixgbevf_stop_ipsec_offload - tear down the IPsec offload
666 * @adapter: board private structure
667 **/
ixgbevf_stop_ipsec_offload(struct ixgbevf_adapter * adapter)668 void ixgbevf_stop_ipsec_offload(struct ixgbevf_adapter *adapter)
669 {
670 struct ixgbevf_ipsec *ipsec = adapter->ipsec;
671
672 adapter->ipsec = NULL;
673 if (ipsec) {
674 kfree(ipsec->rx_tbl);
675 kfree(ipsec->tx_tbl);
676 kfree(ipsec);
677 }
678 }
679