root/drivers/net/ethernet/intel/ixgbevf/ipsec.c

DEFINITIONS

1. ixgbevf_ipsec_set_pf_sa
2. ixgbevf_ipsec_del_pf_sa
3. ixgbevf_ipsec_restore
4. ixgbevf_ipsec_find_empty_idx
5. ixgbevf_ipsec_find_rx_state
6. ixgbevf_ipsec_parse_proto_keys
7. ixgbevf_ipsec_add_sa
8. ixgbevf_ipsec_del_sa
9. ixgbevf_ipsec_offload_ok
10. ixgbevf_ipsec_tx
11. ixgbevf_ipsec_rx
12. ixgbevf_init_ipsec_offload
13. ixgbevf_stop_ipsec_offload

   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  **/
  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  **/
  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  **/
 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
 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
 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  **/
 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  **/
 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->xso.flags & XFRM_OFFLOAD_INBOUND) {
 276                 struct rx_sa rsa;
 277 
 278                 if (xs->calg) {
 279                         netdev_err(dev, "Compression offload not supported\n");
 280                         return -EINVAL;
 281                 }
 282 
 283                 /* find the first unused index */
 284                 ret = ixgbevf_ipsec_find_empty_idx(ipsec, true);
 285                 if (ret < 0) {
 286                         netdev_err(dev, "No space for SA in Rx table!\n");
 287                         return ret;
 288                 }
 289                 sa_idx = (u16)ret;
 290 
 291                 memset(&rsa, 0, sizeof(rsa));
 292                 rsa.used = true;
 293                 rsa.xs = xs;
 294 
 295                 if (rsa.xs->id.proto & IPPROTO_ESP)
 296                         rsa.decrypt = xs->ealg || xs->aead;
 297 
 298                 /* get the key and salt */
 299                 ret = ixgbevf_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
 300                 if (ret) {
 301                         netdev_err(dev, "Failed to get key data for Rx SA table\n");
 302                         return ret;
 303                 }
 304 
 305                 /* get ip for rx sa table */
 306                 if (xs->props.family == AF_INET6)
 307                         memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
 308                 else
 309                         memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
 310 
 311                 rsa.mode = IXGBE_RXMOD_VALID;
 312                 if (rsa.xs->id.proto & IPPROTO_ESP)
 313                         rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
 314                 if (rsa.decrypt)
 315                         rsa.mode |= IXGBE_RXMOD_DECRYPT;
 316                 if (rsa.xs->props.family == AF_INET6)
 317                         rsa.mode |= IXGBE_RXMOD_IPV6;
 318 
 319                 ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
 320                 if (ret < 0)
 321                         return ret;
 322                 rsa.pfsa = ret;
 323 
 324                 /* the preparations worked, so save the info */
 325                 memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
 326 
 327                 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
 328 
 329                 ipsec->num_rx_sa++;
 330 
 331                 /* hash the new entry for faster search in Rx path */
 332                 hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
 333                              (__force u32)rsa.xs->id.spi);
 334         } else {
 335                 struct tx_sa tsa;
 336 
 337                 /* find the first unused index */
 338                 ret = ixgbevf_ipsec_find_empty_idx(ipsec, false);
 339                 if (ret < 0) {
 340                         netdev_err(dev, "No space for SA in Tx table\n");
 341                         return ret;
 342                 }
 343                 sa_idx = (u16)ret;
 344 
 345                 memset(&tsa, 0, sizeof(tsa));
 346                 tsa.used = true;
 347                 tsa.xs = xs;
 348 
 349                 if (xs->id.proto & IPPROTO_ESP)
 350                         tsa.encrypt = xs->ealg || xs->aead;
 351 
 352                 ret = ixgbevf_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
 353                 if (ret) {
 354                         netdev_err(dev, "Failed to get key data for Tx SA table\n");
 355                         memset(&tsa, 0, sizeof(tsa));
 356                         return ret;
 357                 }
 358 
 359                 ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
 360                 if (ret < 0)
 361                         return ret;
 362                 tsa.pfsa = ret;
 363 
 364                 /* the preparations worked, so save the info */
 365                 memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
 366 
 367                 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
 368 
 369                 ipsec->num_tx_sa++;
 370         }
 371 
 372         return 0;
 373 }
 374 
 375 /**
 376  * ixgbevf_ipsec_del_sa - clear out this specific SA
 377  * @xs: pointer to transformer state struct
 378  **/
 379 static void ixgbevf_ipsec_del_sa(struct xfrm_state *xs)
 380 {
 381         struct net_device *dev = xs->xso.dev;
 382         struct ixgbevf_adapter *adapter = netdev_priv(dev);
 383         struct ixgbevf_ipsec *ipsec = adapter->ipsec;
 384         u16 sa_idx;
 385 
 386         if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
 387                 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
 388 
 389                 if (!ipsec->rx_tbl[sa_idx].used) {
 390                         netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
 391                                    sa_idx, xs->xso.offload_handle);
 392                         return;
 393                 }
 394 
 395                 ixgbevf_ipsec_del_pf_sa(adapter, ipsec->rx_tbl[sa_idx].pfsa);
 396                 hash_del_rcu(&ipsec->rx_tbl[sa_idx].hlist);
 397                 memset(&ipsec->rx_tbl[sa_idx], 0, sizeof(struct rx_sa));
 398                 ipsec->num_rx_sa--;
 399         } else {
 400                 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
 401 
 402                 if (!ipsec->tx_tbl[sa_idx].used) {
 403                         netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
 404                                    sa_idx, xs->xso.offload_handle);
 405                         return;
 406                 }
 407 
 408                 ixgbevf_ipsec_del_pf_sa(adapter, ipsec->tx_tbl[sa_idx].pfsa);
 409                 memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
 410                 ipsec->num_tx_sa--;
 411         }
 412 }
 413 
 414 /**
 415  * ixgbevf_ipsec_offload_ok - can this packet use the xfrm hw offload
 416  * @skb: current data packet
 417  * @xs: pointer to transformer state struct
 418  **/
 419 static bool ixgbevf_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 420 {
 421         if (xs->props.family == AF_INET) {
 422                 /* Offload with IPv4 options is not supported yet */
 423                 if (ip_hdr(skb)->ihl != 5)
 424                         return false;
 425         } else {
 426                 /* Offload with IPv6 extension headers is not support yet */
 427                 if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
 428                         return false;
 429         }
 430 
 431         return true;
 432 }
 433 
 434 static const struct xfrmdev_ops ixgbevf_xfrmdev_ops = {
 435         .xdo_dev_state_add = ixgbevf_ipsec_add_sa,
 436         .xdo_dev_state_delete = ixgbevf_ipsec_del_sa,
 437         .xdo_dev_offload_ok = ixgbevf_ipsec_offload_ok,
 438 };
 439 
 440 /**
 441  * ixgbevf_ipsec_tx - setup Tx flags for IPsec offload
 442  * @tx_ring: outgoing context
 443  * @first: current data packet
 444  * @itd: ipsec Tx data for later use in building context descriptor
 445  **/
 446 int ixgbevf_ipsec_tx(struct ixgbevf_ring *tx_ring,
 447                      struct ixgbevf_tx_buffer *first,
 448                      struct ixgbevf_ipsec_tx_data *itd)
 449 {
 450         struct ixgbevf_adapter *adapter = netdev_priv(tx_ring->netdev);
 451         struct ixgbevf_ipsec *ipsec = adapter->ipsec;
 452         struct xfrm_state *xs;
 453         struct sec_path *sp;
 454         struct tx_sa *tsa;
 455         u16 sa_idx;
 456 
 457         sp = skb_sec_path(first->skb);
 458         if (unlikely(!sp->len)) {
 459                 netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
 460                            __func__, sp->len);
 461                 return 0;
 462         }
 463 
 464         xs = xfrm_input_state(first->skb);
 465         if (unlikely(!xs)) {
 466                 netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
 467                            __func__, xs);
 468                 return 0;
 469         }
 470 
 471         sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
 472         if (unlikely(sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
 473                 netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
 474                            __func__, sa_idx, xs->xso.offload_handle);
 475                 return 0;
 476         }
 477 
 478         tsa = &ipsec->tx_tbl[sa_idx];
 479         if (unlikely(!tsa->used)) {
 480                 netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
 481                            __func__, sa_idx);
 482                 return 0;
 483         }
 484 
 485         itd->pfsa = tsa->pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
 486 
 487         first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CSUM;
 488 
 489         if (xs->id.proto == IPPROTO_ESP) {
 490                 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
 491                               IXGBE_ADVTXD_TUCMD_L4T_TCP;
 492                 if (first->protocol == htons(ETH_P_IP))
 493                         itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
 494 
 495                 /* The actual trailer length is authlen (16 bytes) plus
 496                  * 2 bytes for the proto and the padlen values, plus
 497                  * padlen bytes of padding.  This ends up not the same
 498                  * as the static value found in xs->props.trailer_len (21).
 499                  *
 500                  * ... but if we're doing GSO, don't bother as the stack
 501                  * doesn't add a trailer for those.
 502                  */
 503                 if (!skb_is_gso(first->skb)) {
 504                         /* The "correct" way to get the auth length would be
 505                          * to use
 506                          *    authlen = crypto_aead_authsize(xs->data);
 507                          * but since we know we only have one size to worry
 508                          * about * we can let the compiler use the constant
 509                          * and save us a few CPU cycles.
 510                          */
 511                         const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
 512                         struct sk_buff *skb = first->skb;
 513                         u8 padlen;
 514                         int ret;
 515 
 516                         ret = skb_copy_bits(skb, skb->len - (authlen + 2),
 517                                             &padlen, 1);
 518                         if (unlikely(ret))
 519                                 return 0;
 520                         itd->trailer_len = authlen + 2 + padlen;
 521                 }
 522         }
 523         if (tsa->encrypt)
 524                 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
 525 
 526         return 1;
 527 }
 528 
 529 /**
 530  * ixgbevf_ipsec_rx - decode IPsec bits from Rx descriptor
 531  * @rx_ring: receiving ring
 532  * @rx_desc: receive data descriptor
 533  * @skb: current data packet
 534  *
 535  * Determine if there was an IPsec encapsulation noticed, and if so set up
 536  * the resulting status for later in the receive stack.
 537  **/
 538 void ixgbevf_ipsec_rx(struct ixgbevf_ring *rx_ring,
 539                       union ixgbe_adv_rx_desc *rx_desc,
 540                       struct sk_buff *skb)
 541 {
 542         struct ixgbevf_adapter *adapter = netdev_priv(rx_ring->netdev);
 543         __le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
 544         __le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
 545                                              IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
 546         struct ixgbevf_ipsec *ipsec = adapter->ipsec;
 547         struct xfrm_offload *xo = NULL;
 548         struct xfrm_state *xs = NULL;
 549         struct ipv6hdr *ip6 = NULL;
 550         struct iphdr *ip4 = NULL;
 551         struct sec_path *sp;
 552         void *daddr;
 553         __be32 spi;
 554         u8 *c_hdr;
 555         u8 proto;
 556 
 557         /* Find the IP and crypto headers in the data.
 558          * We can assume no VLAN header in the way, b/c the
 559          * hw won't recognize the IPsec packet and anyway the
 560          * currently VLAN device doesn't support xfrm offload.
 561          */
 562         if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
 563                 ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
 564                 daddr = &ip4->daddr;
 565                 c_hdr = (u8 *)ip4 + ip4->ihl * 4;
 566         } else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
 567                 ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
 568                 daddr = &ip6->daddr;
 569                 c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
 570         } else {
 571                 return;
 572         }
 573 
 574         switch (pkt_info & ipsec_pkt_types) {
 575         case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
 576                 spi = ((struct ip_auth_hdr *)c_hdr)->spi;
 577                 proto = IPPROTO_AH;
 578                 break;
 579         case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
 580                 spi = ((struct ip_esp_hdr *)c_hdr)->spi;
 581                 proto = IPPROTO_ESP;
 582                 break;
 583         default:
 584                 return;
 585         }
 586 
 587         xs = ixgbevf_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
 588         if (unlikely(!xs))
 589                 return;
 590 
 591         sp = secpath_set(skb);
 592         if (unlikely(!sp))
 593                 return;
 594 
 595         sp->xvec[sp->len++] = xs;
 596         sp->olen++;
 597         xo = xfrm_offload(skb);
 598         xo->flags = CRYPTO_DONE;
 599         xo->status = CRYPTO_SUCCESS;
 600 
 601         adapter->rx_ipsec++;
 602 }
 603 
 604 /**
 605  * ixgbevf_init_ipsec_offload - initialize registers for IPsec operation
 606  * @adapter: board private structure
 607  **/
 608 void ixgbevf_init_ipsec_offload(struct ixgbevf_adapter *adapter)
 609 {
 610         struct ixgbevf_ipsec *ipsec;
 611         size_t size;
 612 
 613         switch (adapter->hw.api_version) {
 614         case ixgbe_mbox_api_14:
 615                 break;
 616         default:
 617                 return;
 618         }
 619 
 620         ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
 621         if (!ipsec)
 622                 goto err1;
 623         hash_init(ipsec->rx_sa_list);
 624 
 625         size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
 626         ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
 627         if (!ipsec->rx_tbl)
 628                 goto err2;
 629 
 630         size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
 631         ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
 632         if (!ipsec->tx_tbl)
 633                 goto err2;
 634 
 635         ipsec->num_rx_sa = 0;
 636         ipsec->num_tx_sa = 0;
 637 
 638         adapter->ipsec = ipsec;
 639 
 640         adapter->netdev->xfrmdev_ops = &ixgbevf_xfrmdev_ops;
 641 
 642 #define IXGBEVF_ESP_FEATURES    (NETIF_F_HW_ESP | \
 643                                  NETIF_F_HW_ESP_TX_CSUM | \
 644                                  NETIF_F_GSO_ESP)
 645 
 646         adapter->netdev->features |= IXGBEVF_ESP_FEATURES;
 647         adapter->netdev->hw_enc_features |= IXGBEVF_ESP_FEATURES;
 648 
 649         return;
 650 
 651 err2:
 652         kfree(ipsec->rx_tbl);
 653         kfree(ipsec->tx_tbl);
 654         kfree(ipsec);
 655 err1:
 656         netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
 657 }
 658 
 659 /**
 660  * ixgbevf_stop_ipsec_offload - tear down the IPsec offload
 661  * @adapter: board private structure
 662  **/
 663 void ixgbevf_stop_ipsec_offload(struct ixgbevf_adapter *adapter)
 664 {
 665         struct ixgbevf_ipsec *ipsec = adapter->ipsec;
 666 
 667         adapter->ipsec = NULL;
 668         if (ipsec) {
 669                 kfree(ipsec->rx_tbl);
 670                 kfree(ipsec->tx_tbl);
 671                 kfree(ipsec);
 672         }
 673 }