1 /*
2 * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33
34 #include <crypto/aead.h>
35 #include <net/xfrm.h>
36 #include <net/esp.h>
37 #include "accel/ipsec_offload.h"
38 #include "en_accel/ipsec_rxtx.h"
39 #include "en_accel/ipsec.h"
40 #include "accel/accel.h"
41 #include "en.h"
42
43 enum {
44 MLX5E_IPSEC_RX_SYNDROME_DECRYPTED = 0x11,
45 MLX5E_IPSEC_RX_SYNDROME_AUTH_FAILED = 0x12,
46 MLX5E_IPSEC_RX_SYNDROME_BAD_PROTO = 0x17,
47 };
48
49 struct mlx5e_ipsec_rx_metadata {
50 unsigned char nexthdr;
51 __be32 sa_handle;
52 } __packed;
53
54 enum {
55 MLX5E_IPSEC_TX_SYNDROME_OFFLOAD = 0x8,
56 MLX5E_IPSEC_TX_SYNDROME_OFFLOAD_WITH_LSO_TCP = 0x9,
57 };
58
59 struct mlx5e_ipsec_tx_metadata {
60 __be16 mss_inv; /* 1/MSS in 16bit fixed point, only for LSO */
61 __be16 seq; /* LSBs of the first TCP seq, only for LSO */
62 u8 esp_next_proto; /* Next protocol of ESP */
63 } __packed;
64
65 struct mlx5e_ipsec_metadata {
66 unsigned char syndrome;
67 union {
68 unsigned char raw[5];
69 /* from FPGA to host, on successful decrypt */
70 struct mlx5e_ipsec_rx_metadata rx;
71 /* from host to FPGA */
72 struct mlx5e_ipsec_tx_metadata tx;
73 } __packed content;
74 /* packet type ID field */
75 __be16 ethertype;
76 } __packed;
77
78 #define MAX_LSO_MSS 2048
79
80 /* Pre-calculated (Q0.16) fixed-point inverse 1/x function */
81 static __be16 mlx5e_ipsec_inverse_table[MAX_LSO_MSS];
82
mlx5e_ipsec_mss_inv(struct sk_buff * skb)83 static inline __be16 mlx5e_ipsec_mss_inv(struct sk_buff *skb)
84 {
85 return mlx5e_ipsec_inverse_table[skb_shinfo(skb)->gso_size];
86 }
87
mlx5e_ipsec_add_metadata(struct sk_buff * skb)88 static struct mlx5e_ipsec_metadata *mlx5e_ipsec_add_metadata(struct sk_buff *skb)
89 {
90 struct mlx5e_ipsec_metadata *mdata;
91 struct ethhdr *eth;
92
93 if (unlikely(skb_cow_head(skb, sizeof(*mdata))))
94 return ERR_PTR(-ENOMEM);
95
96 eth = (struct ethhdr *)skb_push(skb, sizeof(*mdata));
97 skb->mac_header -= sizeof(*mdata);
98 mdata = (struct mlx5e_ipsec_metadata *)(eth + 1);
99
100 memmove(skb->data, skb->data + sizeof(*mdata),
101 2 * ETH_ALEN);
102
103 eth->h_proto = cpu_to_be16(MLX5E_METADATA_ETHER_TYPE);
104
105 memset(mdata->content.raw, 0, sizeof(mdata->content.raw));
106 return mdata;
107 }
108
mlx5e_ipsec_remove_trailer(struct sk_buff * skb,struct xfrm_state * x)109 static int mlx5e_ipsec_remove_trailer(struct sk_buff *skb, struct xfrm_state *x)
110 {
111 unsigned int alen = crypto_aead_authsize(x->data);
112 struct ipv6hdr *ipv6hdr = ipv6_hdr(skb);
113 struct iphdr *ipv4hdr = ip_hdr(skb);
114 unsigned int trailer_len;
115 u8 plen;
116 int ret;
117
118 ret = skb_copy_bits(skb, skb->len - alen - 2, &plen, 1);
119 if (unlikely(ret))
120 return ret;
121
122 trailer_len = alen + plen + 2;
123
124 pskb_trim(skb, skb->len - trailer_len);
125 if (skb->protocol == htons(ETH_P_IP)) {
126 ipv4hdr->tot_len = htons(ntohs(ipv4hdr->tot_len) - trailer_len);
127 ip_send_check(ipv4hdr);
128 } else {
129 ipv6hdr->payload_len = htons(ntohs(ipv6hdr->payload_len) -
130 trailer_len);
131 }
132 return 0;
133 }
134
mlx5e_ipsec_set_swp(struct sk_buff * skb,struct mlx5_wqe_eth_seg * eseg,u8 mode,struct xfrm_offload * xo)135 static void mlx5e_ipsec_set_swp(struct sk_buff *skb,
136 struct mlx5_wqe_eth_seg *eseg, u8 mode,
137 struct xfrm_offload *xo)
138 {
139 /* Tunnel Mode:
140 * SWP: OutL3 InL3 InL4
141 * Pkt: MAC IP ESP IP L4
142 *
143 * Transport Mode:
144 * SWP: OutL3 OutL4
145 * Pkt: MAC IP ESP L4
146 *
147 * Tunnel(VXLAN TCP/UDP) over Transport Mode
148 * SWP: OutL3 InL3 InL4
149 * Pkt: MAC IP ESP UDP VXLAN IP L4
150 */
151
152 /* Shared settings */
153 eseg->swp_outer_l3_offset = skb_network_offset(skb) / 2;
154 if (skb->protocol == htons(ETH_P_IPV6))
155 eseg->swp_flags |= MLX5_ETH_WQE_SWP_OUTER_L3_IPV6;
156
157 /* Tunnel mode */
158 if (mode == XFRM_MODE_TUNNEL) {
159 eseg->swp_inner_l3_offset = skb_inner_network_offset(skb) / 2;
160 eseg->swp_inner_l4_offset = skb_inner_transport_offset(skb) / 2;
161 if (xo->proto == IPPROTO_IPV6)
162 eseg->swp_flags |= MLX5_ETH_WQE_SWP_INNER_L3_IPV6;
163 if (inner_ip_hdr(skb)->protocol == IPPROTO_UDP)
164 eseg->swp_flags |= MLX5_ETH_WQE_SWP_INNER_L4_UDP;
165 return;
166 }
167
168 /* Transport mode */
169 if (mode != XFRM_MODE_TRANSPORT)
170 return;
171
172 if (!xo->inner_ipproto) {
173 switch (xo->proto) {
174 case IPPROTO_UDP:
175 eseg->swp_flags |= MLX5_ETH_WQE_SWP_OUTER_L4_UDP;
176 fallthrough;
177 case IPPROTO_TCP:
178 /* IP | ESP | TCP */
179 eseg->swp_outer_l4_offset = skb_inner_transport_offset(skb) / 2;
180 break;
181 default:
182 break;
183 }
184 } else {
185 /* Tunnel(VXLAN TCP/UDP) over Transport Mode */
186 switch (xo->inner_ipproto) {
187 case IPPROTO_UDP:
188 eseg->swp_flags |= MLX5_ETH_WQE_SWP_INNER_L4_UDP;
189 fallthrough;
190 case IPPROTO_TCP:
191 eseg->swp_inner_l3_offset = skb_inner_network_offset(skb) / 2;
192 eseg->swp_inner_l4_offset =
193 (skb->csum_start + skb->head - skb->data) / 2;
194 if (skb->protocol == htons(ETH_P_IPV6))
195 eseg->swp_flags |= MLX5_ETH_WQE_SWP_INNER_L3_IPV6;
196 break;
197 default:
198 break;
199 }
200 }
201
202 }
203
mlx5e_ipsec_set_iv_esn(struct sk_buff * skb,struct xfrm_state * x,struct xfrm_offload * xo)204 void mlx5e_ipsec_set_iv_esn(struct sk_buff *skb, struct xfrm_state *x,
205 struct xfrm_offload *xo)
206 {
207 struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
208 __u32 oseq = replay_esn->oseq;
209 int iv_offset;
210 __be64 seqno;
211 u32 seq_hi;
212
213 if (unlikely(skb_is_gso(skb) && oseq < MLX5E_IPSEC_ESN_SCOPE_MID &&
214 MLX5E_IPSEC_ESN_SCOPE_MID < (oseq - skb_shinfo(skb)->gso_segs))) {
215 seq_hi = xo->seq.hi - 1;
216 } else {
217 seq_hi = xo->seq.hi;
218 }
219
220 /* Place the SN in the IV field */
221 seqno = cpu_to_be64(xo->seq.low + ((u64)seq_hi << 32));
222 iv_offset = skb_transport_offset(skb) + sizeof(struct ip_esp_hdr);
223 skb_store_bits(skb, iv_offset, &seqno, 8);
224 }
225
mlx5e_ipsec_set_iv(struct sk_buff * skb,struct xfrm_state * x,struct xfrm_offload * xo)226 void mlx5e_ipsec_set_iv(struct sk_buff *skb, struct xfrm_state *x,
227 struct xfrm_offload *xo)
228 {
229 int iv_offset;
230 __be64 seqno;
231
232 /* Place the SN in the IV field */
233 seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32));
234 iv_offset = skb_transport_offset(skb) + sizeof(struct ip_esp_hdr);
235 skb_store_bits(skb, iv_offset, &seqno, 8);
236 }
237
mlx5e_ipsec_set_metadata(struct sk_buff * skb,struct mlx5e_ipsec_metadata * mdata,struct xfrm_offload * xo)238 static void mlx5e_ipsec_set_metadata(struct sk_buff *skb,
239 struct mlx5e_ipsec_metadata *mdata,
240 struct xfrm_offload *xo)
241 {
242 struct ip_esp_hdr *esph;
243 struct tcphdr *tcph;
244
245 if (skb_is_gso(skb)) {
246 /* Add LSO metadata indication */
247 esph = ip_esp_hdr(skb);
248 tcph = inner_tcp_hdr(skb);
249 netdev_dbg(skb->dev, " Offloading GSO packet outer L3 %u; L4 %u; Inner L3 %u; L4 %u\n",
250 skb->network_header,
251 skb->transport_header,
252 skb->inner_network_header,
253 skb->inner_transport_header);
254 netdev_dbg(skb->dev, " Offloading GSO packet of len %u; mss %u; TCP sp %u dp %u seq 0x%x ESP seq 0x%x\n",
255 skb->len, skb_shinfo(skb)->gso_size,
256 ntohs(tcph->source), ntohs(tcph->dest),
257 ntohl(tcph->seq), ntohl(esph->seq_no));
258 mdata->syndrome = MLX5E_IPSEC_TX_SYNDROME_OFFLOAD_WITH_LSO_TCP;
259 mdata->content.tx.mss_inv = mlx5e_ipsec_mss_inv(skb);
260 mdata->content.tx.seq = htons(ntohl(tcph->seq) & 0xFFFF);
261 } else {
262 mdata->syndrome = MLX5E_IPSEC_TX_SYNDROME_OFFLOAD;
263 }
264 mdata->content.tx.esp_next_proto = xo->proto;
265
266 netdev_dbg(skb->dev, " TX metadata syndrome %u proto %u mss_inv %04x seq %04x\n",
267 mdata->syndrome, mdata->content.tx.esp_next_proto,
268 ntohs(mdata->content.tx.mss_inv),
269 ntohs(mdata->content.tx.seq));
270 }
271
mlx5e_ipsec_handle_tx_wqe(struct mlx5e_tx_wqe * wqe,struct mlx5e_accel_tx_ipsec_state * ipsec_st,struct mlx5_wqe_inline_seg * inlseg)272 void mlx5e_ipsec_handle_tx_wqe(struct mlx5e_tx_wqe *wqe,
273 struct mlx5e_accel_tx_ipsec_state *ipsec_st,
274 struct mlx5_wqe_inline_seg *inlseg)
275 {
276 inlseg->byte_count = cpu_to_be32(ipsec_st->tailen | MLX5_INLINE_SEG);
277 esp_output_fill_trailer((u8 *)inlseg->data, 0, ipsec_st->plen, ipsec_st->xo->proto);
278 }
279
mlx5e_ipsec_set_state(struct mlx5e_priv * priv,struct sk_buff * skb,struct xfrm_state * x,struct xfrm_offload * xo,struct mlx5e_accel_tx_ipsec_state * ipsec_st)280 static int mlx5e_ipsec_set_state(struct mlx5e_priv *priv,
281 struct sk_buff *skb,
282 struct xfrm_state *x,
283 struct xfrm_offload *xo,
284 struct mlx5e_accel_tx_ipsec_state *ipsec_st)
285 {
286 unsigned int blksize, clen, alen, plen;
287 struct crypto_aead *aead;
288 unsigned int tailen;
289
290 ipsec_st->x = x;
291 ipsec_st->xo = xo;
292 if (mlx5_is_ipsec_device(priv->mdev)) {
293 aead = x->data;
294 alen = crypto_aead_authsize(aead);
295 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
296 clen = ALIGN(skb->len + 2, blksize);
297 plen = max_t(u32, clen - skb->len, 4);
298 tailen = plen + alen;
299 ipsec_st->plen = plen;
300 ipsec_st->tailen = tailen;
301 }
302
303 return 0;
304 }
305
mlx5e_ipsec_tx_build_eseg(struct mlx5e_priv * priv,struct sk_buff * skb,struct mlx5_wqe_eth_seg * eseg)306 void mlx5e_ipsec_tx_build_eseg(struct mlx5e_priv *priv, struct sk_buff *skb,
307 struct mlx5_wqe_eth_seg *eseg)
308 {
309 struct xfrm_offload *xo = xfrm_offload(skb);
310 struct xfrm_encap_tmpl *encap;
311 struct xfrm_state *x;
312 struct sec_path *sp;
313 u8 l3_proto;
314
315 sp = skb_sec_path(skb);
316 if (unlikely(sp->len != 1))
317 return;
318
319 x = xfrm_input_state(skb);
320 if (unlikely(!x))
321 return;
322
323 if (unlikely(!x->xso.offload_handle ||
324 (skb->protocol != htons(ETH_P_IP) &&
325 skb->protocol != htons(ETH_P_IPV6))))
326 return;
327
328 mlx5e_ipsec_set_swp(skb, eseg, x->props.mode, xo);
329
330 l3_proto = (x->props.family == AF_INET) ?
331 ((struct iphdr *)skb_network_header(skb))->protocol :
332 ((struct ipv6hdr *)skb_network_header(skb))->nexthdr;
333
334 if (mlx5_is_ipsec_device(priv->mdev)) {
335 eseg->flow_table_metadata |= cpu_to_be32(MLX5_ETH_WQE_FT_META_IPSEC);
336 eseg->trailer |= cpu_to_be32(MLX5_ETH_WQE_INSERT_TRAILER);
337 encap = x->encap;
338 if (!encap) {
339 eseg->trailer |= (l3_proto == IPPROTO_ESP) ?
340 cpu_to_be32(MLX5_ETH_WQE_TRAILER_HDR_OUTER_IP_ASSOC) :
341 cpu_to_be32(MLX5_ETH_WQE_TRAILER_HDR_OUTER_L4_ASSOC);
342 } else if (encap->encap_type == UDP_ENCAP_ESPINUDP) {
343 eseg->trailer |= (l3_proto == IPPROTO_ESP) ?
344 cpu_to_be32(MLX5_ETH_WQE_TRAILER_HDR_INNER_IP_ASSOC) :
345 cpu_to_be32(MLX5_ETH_WQE_TRAILER_HDR_INNER_L4_ASSOC);
346 }
347 }
348 }
349
mlx5e_ipsec_handle_tx_skb(struct net_device * netdev,struct sk_buff * skb,struct mlx5e_accel_tx_ipsec_state * ipsec_st)350 bool mlx5e_ipsec_handle_tx_skb(struct net_device *netdev,
351 struct sk_buff *skb,
352 struct mlx5e_accel_tx_ipsec_state *ipsec_st)
353 {
354 struct mlx5e_priv *priv = netdev_priv(netdev);
355 struct xfrm_offload *xo = xfrm_offload(skb);
356 struct mlx5e_ipsec_sa_entry *sa_entry;
357 struct mlx5e_ipsec_metadata *mdata;
358 struct xfrm_state *x;
359 struct sec_path *sp;
360
361 sp = skb_sec_path(skb);
362 if (unlikely(sp->len != 1)) {
363 atomic64_inc(&priv->ipsec->sw_stats.ipsec_tx_drop_bundle);
364 goto drop;
365 }
366
367 x = xfrm_input_state(skb);
368 if (unlikely(!x)) {
369 atomic64_inc(&priv->ipsec->sw_stats.ipsec_tx_drop_no_state);
370 goto drop;
371 }
372
373 if (unlikely(!x->xso.offload_handle ||
374 (skb->protocol != htons(ETH_P_IP) &&
375 skb->protocol != htons(ETH_P_IPV6)))) {
376 atomic64_inc(&priv->ipsec->sw_stats.ipsec_tx_drop_not_ip);
377 goto drop;
378 }
379
380 if (!skb_is_gso(skb))
381 if (unlikely(mlx5e_ipsec_remove_trailer(skb, x))) {
382 atomic64_inc(&priv->ipsec->sw_stats.ipsec_tx_drop_trailer);
383 goto drop;
384 }
385
386 if (MLX5_CAP_GEN(priv->mdev, fpga)) {
387 mdata = mlx5e_ipsec_add_metadata(skb);
388 if (IS_ERR(mdata)) {
389 atomic64_inc(&priv->ipsec->sw_stats.ipsec_tx_drop_metadata);
390 goto drop;
391 }
392 }
393
394 sa_entry = (struct mlx5e_ipsec_sa_entry *)x->xso.offload_handle;
395 sa_entry->set_iv_op(skb, x, xo);
396 if (MLX5_CAP_GEN(priv->mdev, fpga))
397 mlx5e_ipsec_set_metadata(skb, mdata, xo);
398
399 mlx5e_ipsec_set_state(priv, skb, x, xo, ipsec_st);
400
401 return true;
402
403 drop:
404 kfree_skb(skb);
405 return false;
406 }
407
408 static inline struct xfrm_state *
mlx5e_ipsec_build_sp(struct net_device * netdev,struct sk_buff * skb,struct mlx5e_ipsec_metadata * mdata)409 mlx5e_ipsec_build_sp(struct net_device *netdev, struct sk_buff *skb,
410 struct mlx5e_ipsec_metadata *mdata)
411 {
412 struct mlx5e_priv *priv = netdev_priv(netdev);
413 struct xfrm_offload *xo;
414 struct xfrm_state *xs;
415 struct sec_path *sp;
416 u32 sa_handle;
417
418 sp = secpath_set(skb);
419 if (unlikely(!sp)) {
420 atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_sp_alloc);
421 return NULL;
422 }
423
424 sa_handle = be32_to_cpu(mdata->content.rx.sa_handle);
425 xs = mlx5e_ipsec_sadb_rx_lookup(priv->ipsec, sa_handle);
426 if (unlikely(!xs)) {
427 atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_sadb_miss);
428 return NULL;
429 }
430
431 sp = skb_sec_path(skb);
432 sp->xvec[sp->len++] = xs;
433 sp->olen++;
434
435 xo = xfrm_offload(skb);
436 xo->flags = CRYPTO_DONE;
437 switch (mdata->syndrome) {
438 case MLX5E_IPSEC_RX_SYNDROME_DECRYPTED:
439 xo->status = CRYPTO_SUCCESS;
440 if (likely(priv->ipsec->no_trailer)) {
441 xo->flags |= XFRM_ESP_NO_TRAILER;
442 xo->proto = mdata->content.rx.nexthdr;
443 }
444 break;
445 case MLX5E_IPSEC_RX_SYNDROME_AUTH_FAILED:
446 xo->status = CRYPTO_TUNNEL_ESP_AUTH_FAILED;
447 break;
448 case MLX5E_IPSEC_RX_SYNDROME_BAD_PROTO:
449 xo->status = CRYPTO_INVALID_PROTOCOL;
450 break;
451 default:
452 atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_syndrome);
453 return NULL;
454 }
455 return xs;
456 }
457
mlx5e_ipsec_handle_rx_skb(struct net_device * netdev,struct sk_buff * skb,u32 * cqe_bcnt)458 struct sk_buff *mlx5e_ipsec_handle_rx_skb(struct net_device *netdev,
459 struct sk_buff *skb, u32 *cqe_bcnt)
460 {
461 struct mlx5e_ipsec_metadata *mdata;
462 struct xfrm_state *xs;
463
464 if (!is_metadata_hdr_valid(skb))
465 return skb;
466
467 /* Use the metadata */
468 mdata = (struct mlx5e_ipsec_metadata *)(skb->data + ETH_HLEN);
469 xs = mlx5e_ipsec_build_sp(netdev, skb, mdata);
470 if (unlikely(!xs)) {
471 kfree_skb(skb);
472 return NULL;
473 }
474
475 remove_metadata_hdr(skb);
476 *cqe_bcnt -= MLX5E_METADATA_ETHER_LEN;
477
478 return skb;
479 }
480
481 enum {
482 MLX5E_IPSEC_OFFLOAD_RX_SYNDROME_DECRYPTED,
483 MLX5E_IPSEC_OFFLOAD_RX_SYNDROME_AUTH_FAILED,
484 MLX5E_IPSEC_OFFLOAD_RX_SYNDROME_BAD_TRAILER,
485 };
486
mlx5e_ipsec_offload_handle_rx_skb(struct net_device * netdev,struct sk_buff * skb,struct mlx5_cqe64 * cqe)487 void mlx5e_ipsec_offload_handle_rx_skb(struct net_device *netdev,
488 struct sk_buff *skb,
489 struct mlx5_cqe64 *cqe)
490 {
491 u32 ipsec_meta_data = be32_to_cpu(cqe->ft_metadata);
492 struct mlx5e_priv *priv;
493 struct xfrm_offload *xo;
494 struct xfrm_state *xs;
495 struct sec_path *sp;
496 u32 sa_handle;
497
498 sa_handle = MLX5_IPSEC_METADATA_HANDLE(ipsec_meta_data);
499 priv = netdev_priv(netdev);
500 sp = secpath_set(skb);
501 if (unlikely(!sp)) {
502 atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_sp_alloc);
503 return;
504 }
505
506 xs = mlx5e_ipsec_sadb_rx_lookup(priv->ipsec, sa_handle);
507 if (unlikely(!xs)) {
508 atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_sadb_miss);
509 return;
510 }
511
512 sp = skb_sec_path(skb);
513 sp->xvec[sp->len++] = xs;
514 sp->olen++;
515
516 xo = xfrm_offload(skb);
517 xo->flags = CRYPTO_DONE;
518
519 switch (MLX5_IPSEC_METADATA_SYNDROM(ipsec_meta_data)) {
520 case MLX5E_IPSEC_OFFLOAD_RX_SYNDROME_DECRYPTED:
521 xo->status = CRYPTO_SUCCESS;
522 if (WARN_ON_ONCE(priv->ipsec->no_trailer))
523 xo->flags |= XFRM_ESP_NO_TRAILER;
524 break;
525 case MLX5E_IPSEC_OFFLOAD_RX_SYNDROME_AUTH_FAILED:
526 xo->status = CRYPTO_TUNNEL_ESP_AUTH_FAILED;
527 break;
528 case MLX5E_IPSEC_OFFLOAD_RX_SYNDROME_BAD_TRAILER:
529 xo->status = CRYPTO_INVALID_PACKET_SYNTAX;
530 break;
531 default:
532 atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_syndrome);
533 }
534 }
535
mlx5e_ipsec_build_inverse_table(void)536 void mlx5e_ipsec_build_inverse_table(void)
537 {
538 u16 mss_inv;
539 u32 mss;
540
541 /* Calculate 1/x inverse table for use in GSO data path.
542 * Using this table, we provide the IPSec accelerator with the value of
543 * 1/gso_size so that it can infer the position of each segment inside
544 * the GSO, and increment the ESP sequence number, and generate the IV.
545 * The HW needs this value in Q0.16 fixed-point number format
546 */
547 mlx5e_ipsec_inverse_table[1] = htons(0xFFFF);
548 for (mss = 2; mss < MAX_LSO_MSS; mss++) {
549 mss_inv = div_u64(1ULL << 32, mss) >> 16;
550 mlx5e_ipsec_inverse_table[mss] = htons(mss_inv);
551 }
552 }
553
