linux/drivers/net/ethernet/intel/ixgbevf/ipsec.c
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   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
   9static 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 **/
  18static 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
  55out:
  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 **/
  68static 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
  88out:
  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 **/
 101void 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 **/
 139static
 140int 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 **/
 177static
 178struct 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 **/
 211static int ixgbevf_ipsec_parse_proto_keys(struct xfrm_state *xs,
 212                                          u32 *mykey, u32 *mysalt)
 213{
 214        struct net_device *dev = xs->xso.real_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 **/
 261static int ixgbevf_ipsec_add_sa(struct xfrm_state *xs)
 262{
 263        struct net_device *dev = xs->xso.real_dev;
 264        struct ixgbevf_adapter *adapter;
 265        struct ixgbevf_ipsec *ipsec;
 266        u16 sa_idx;
 267        int ret;
 268
 269        adapter = netdev_priv(dev);
 270        ipsec = adapter->ipsec;
 271
 272        if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
 273                netdev_err(dev, "Unsupported protocol 0x%04x for IPsec offload\n",
 274                           xs->id.proto);
 275                return -EINVAL;
 276        }
 277
 278        if (xs->props.mode != XFRM_MODE_TRANSPORT) {
 279                netdev_err(dev, "Unsupported mode for ipsec offload\n");
 280                return -EINVAL;
 281        }
 282
 283        if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
 284                struct rx_sa rsa;
 285
 286                if (xs->calg) {
 287                        netdev_err(dev, "Compression offload not supported\n");
 288                        return -EINVAL;
 289                }
 290
 291                /* find the first unused index */
 292                ret = ixgbevf_ipsec_find_empty_idx(ipsec, true);
 293                if (ret < 0) {
 294                        netdev_err(dev, "No space for SA in Rx table!\n");
 295                        return ret;
 296                }
 297                sa_idx = (u16)ret;
 298
 299                memset(&rsa, 0, sizeof(rsa));
 300                rsa.used = true;
 301                rsa.xs = xs;
 302
 303                if (rsa.xs->id.proto & IPPROTO_ESP)
 304                        rsa.decrypt = xs->ealg || xs->aead;
 305
 306                /* get the key and salt */
 307                ret = ixgbevf_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
 308                if (ret) {
 309                        netdev_err(dev, "Failed to get key data for Rx SA table\n");
 310                        return ret;
 311                }
 312
 313                /* get ip for rx sa table */
 314                if (xs->props.family == AF_INET6)
 315                        memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
 316                else
 317                        memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
 318
 319                rsa.mode = IXGBE_RXMOD_VALID;
 320                if (rsa.xs->id.proto & IPPROTO_ESP)
 321                        rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
 322                if (rsa.decrypt)
 323                        rsa.mode |= IXGBE_RXMOD_DECRYPT;
 324                if (rsa.xs->props.family == AF_INET6)
 325                        rsa.mode |= IXGBE_RXMOD_IPV6;
 326
 327                ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
 328                if (ret < 0)
 329                        return ret;
 330                rsa.pfsa = ret;
 331
 332                /* the preparations worked, so save the info */
 333                memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
 334
 335                xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
 336
 337                ipsec->num_rx_sa++;
 338
 339                /* hash the new entry for faster search in Rx path */
 340                hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
 341                             (__force u32)rsa.xs->id.spi);
 342        } else {
 343                struct tx_sa tsa;
 344
 345                /* find the first unused index */
 346                ret = ixgbevf_ipsec_find_empty_idx(ipsec, false);
 347                if (ret < 0) {
 348                        netdev_err(dev, "No space for SA in Tx table\n");
 349                        return ret;
 350                }
 351                sa_idx = (u16)ret;
 352
 353                memset(&tsa, 0, sizeof(tsa));
 354                tsa.used = true;
 355                tsa.xs = xs;
 356
 357                if (xs->id.proto & IPPROTO_ESP)
 358                        tsa.encrypt = xs->ealg || xs->aead;
 359
 360                ret = ixgbevf_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
 361                if (ret) {
 362                        netdev_err(dev, "Failed to get key data for Tx SA table\n");
 363                        memset(&tsa, 0, sizeof(tsa));
 364                        return ret;
 365                }
 366
 367                ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
 368                if (ret < 0)
 369                        return ret;
 370                tsa.pfsa = ret;
 371
 372                /* the preparations worked, so save the info */
 373                memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
 374
 375                xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
 376
 377                ipsec->num_tx_sa++;
 378        }
 379
 380        return 0;
 381}
 382
 383/**
 384 * ixgbevf_ipsec_del_sa - clear out this specific SA
 385 * @xs: pointer to transformer state struct
 386 **/
 387static void ixgbevf_ipsec_del_sa(struct xfrm_state *xs)
 388{
 389        struct net_device *dev = xs->xso.real_dev;
 390        struct ixgbevf_adapter *adapter;
 391        struct ixgbevf_ipsec *ipsec;
 392        u16 sa_idx;
 393
 394        adapter = netdev_priv(dev);
 395        ipsec = adapter->ipsec;
 396
 397        if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
 398                sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
 399
 400                if (!ipsec->rx_tbl[sa_idx].used) {
 401                        netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
 402                                   sa_idx, xs->xso.offload_handle);
 403                        return;
 404                }
 405
 406                ixgbevf_ipsec_del_pf_sa(adapter, ipsec->rx_tbl[sa_idx].pfsa);
 407                hash_del_rcu(&ipsec->rx_tbl[sa_idx].hlist);
 408                memset(&ipsec->rx_tbl[sa_idx], 0, sizeof(struct rx_sa));
 409                ipsec->num_rx_sa--;
 410        } else {
 411                sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
 412
 413                if (!ipsec->tx_tbl[sa_idx].used) {
 414                        netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
 415                                   sa_idx, xs->xso.offload_handle);
 416                        return;
 417                }
 418
 419                ixgbevf_ipsec_del_pf_sa(adapter, ipsec->tx_tbl[sa_idx].pfsa);
 420                memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
 421                ipsec->num_tx_sa--;
 422        }
 423}
 424
 425/**
 426 * ixgbevf_ipsec_offload_ok - can this packet use the xfrm hw offload
 427 * @skb: current data packet
 428 * @xs: pointer to transformer state struct
 429 **/
 430static bool ixgbevf_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 431{
 432        if (xs->props.family == AF_INET) {
 433                /* Offload with IPv4 options is not supported yet */
 434                if (ip_hdr(skb)->ihl != 5)
 435                        return false;
 436        } else {
 437                /* Offload with IPv6 extension headers is not support yet */
 438                if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
 439                        return false;
 440        }
 441
 442        return true;
 443}
 444
 445static const struct xfrmdev_ops ixgbevf_xfrmdev_ops = {
 446        .xdo_dev_state_add = ixgbevf_ipsec_add_sa,
 447        .xdo_dev_state_delete = ixgbevf_ipsec_del_sa,
 448        .xdo_dev_offload_ok = ixgbevf_ipsec_offload_ok,
 449};
 450
 451/**
 452 * ixgbevf_ipsec_tx - setup Tx flags for IPsec offload
 453 * @tx_ring: outgoing context
 454 * @first: current data packet
 455 * @itd: ipsec Tx data for later use in building context descriptor
 456 **/
 457int ixgbevf_ipsec_tx(struct ixgbevf_ring *tx_ring,
 458                     struct ixgbevf_tx_buffer *first,
 459                     struct ixgbevf_ipsec_tx_data *itd)
 460{
 461        struct ixgbevf_adapter *adapter = netdev_priv(tx_ring->netdev);
 462        struct ixgbevf_ipsec *ipsec = adapter->ipsec;
 463        struct xfrm_state *xs;
 464        struct sec_path *sp;
 465        struct tx_sa *tsa;
 466        u16 sa_idx;
 467
 468        sp = skb_sec_path(first->skb);
 469        if (unlikely(!sp->len)) {
 470                netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
 471                           __func__, sp->len);
 472                return 0;
 473        }
 474
 475        xs = xfrm_input_state(first->skb);
 476        if (unlikely(!xs)) {
 477                netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
 478                           __func__, xs);
 479                return 0;
 480        }
 481
 482        sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
 483        if (unlikely(sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
 484                netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
 485                           __func__, sa_idx, xs->xso.offload_handle);
 486                return 0;
 487        }
 488
 489        tsa = &ipsec->tx_tbl[sa_idx];
 490        if (unlikely(!tsa->used)) {
 491                netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
 492                           __func__, sa_idx);
 493                return 0;
 494        }
 495
 496        itd->pfsa = tsa->pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
 497
 498        first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CSUM;
 499
 500        if (xs->id.proto == IPPROTO_ESP) {
 501                itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
 502                              IXGBE_ADVTXD_TUCMD_L4T_TCP;
 503                if (first->protocol == htons(ETH_P_IP))
 504                        itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
 505
 506                /* The actual trailer length is authlen (16 bytes) plus
 507                 * 2 bytes for the proto and the padlen values, plus
 508                 * padlen bytes of padding.  This ends up not the same
 509                 * as the static value found in xs->props.trailer_len (21).
 510                 *
 511                 * ... but if we're doing GSO, don't bother as the stack
 512                 * doesn't add a trailer for those.
 513                 */
 514                if (!skb_is_gso(first->skb)) {
 515                        /* The "correct" way to get the auth length would be
 516                         * to use
 517                         *    authlen = crypto_aead_authsize(xs->data);
 518                         * but since we know we only have one size to worry
 519                         * about * we can let the compiler use the constant
 520                         * and save us a few CPU cycles.
 521                         */
 522                        const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
 523                        struct sk_buff *skb = first->skb;
 524                        u8 padlen;
 525                        int ret;
 526
 527                        ret = skb_copy_bits(skb, skb->len - (authlen + 2),
 528                                            &padlen, 1);
 529                        if (unlikely(ret))
 530                                return 0;
 531                        itd->trailer_len = authlen + 2 + padlen;
 532                }
 533        }
 534        if (tsa->encrypt)
 535                itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
 536
 537        return 1;
 538}
 539
 540/**
 541 * ixgbevf_ipsec_rx - decode IPsec bits from Rx descriptor
 542 * @rx_ring: receiving ring
 543 * @rx_desc: receive data descriptor
 544 * @skb: current data packet
 545 *
 546 * Determine if there was an IPsec encapsulation noticed, and if so set up
 547 * the resulting status for later in the receive stack.
 548 **/
 549void ixgbevf_ipsec_rx(struct ixgbevf_ring *rx_ring,
 550                      union ixgbe_adv_rx_desc *rx_desc,
 551                      struct sk_buff *skb)
 552{
 553        struct ixgbevf_adapter *adapter = netdev_priv(rx_ring->netdev);
 554        __le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
 555        __le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
 556                                             IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
 557        struct ixgbevf_ipsec *ipsec = adapter->ipsec;
 558        struct xfrm_offload *xo = NULL;
 559        struct xfrm_state *xs = NULL;
 560        struct ipv6hdr *ip6 = NULL;
 561        struct iphdr *ip4 = NULL;
 562        struct sec_path *sp;
 563        void *daddr;
 564        __be32 spi;
 565        u8 *c_hdr;
 566        u8 proto;
 567
 568        /* Find the IP and crypto headers in the data.
 569         * We can assume no VLAN header in the way, b/c the
 570         * hw won't recognize the IPsec packet and anyway the
 571         * currently VLAN device doesn't support xfrm offload.
 572         */
 573        if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
 574                ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
 575                daddr = &ip4->daddr;
 576                c_hdr = (u8 *)ip4 + ip4->ihl * 4;
 577        } else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
 578                ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
 579                daddr = &ip6->daddr;
 580                c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
 581        } else {
 582                return;
 583        }
 584
 585        switch (pkt_info & ipsec_pkt_types) {
 586        case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
 587                spi = ((struct ip_auth_hdr *)c_hdr)->spi;
 588                proto = IPPROTO_AH;
 589                break;
 590        case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
 591                spi = ((struct ip_esp_hdr *)c_hdr)->spi;
 592                proto = IPPROTO_ESP;
 593                break;
 594        default:
 595                return;
 596        }
 597
 598        xs = ixgbevf_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
 599        if (unlikely(!xs))
 600                return;
 601
 602        sp = secpath_set(skb);
 603        if (unlikely(!sp))
 604                return;
 605
 606        sp->xvec[sp->len++] = xs;
 607        sp->olen++;
 608        xo = xfrm_offload(skb);
 609        xo->flags = CRYPTO_DONE;
 610        xo->status = CRYPTO_SUCCESS;
 611
 612        adapter->rx_ipsec++;
 613}
 614
 615/**
 616 * ixgbevf_init_ipsec_offload - initialize registers for IPsec operation
 617 * @adapter: board private structure
 618 **/
 619void ixgbevf_init_ipsec_offload(struct ixgbevf_adapter *adapter)
 620{
 621        struct ixgbevf_ipsec *ipsec;
 622        size_t size;
 623
 624        switch (adapter->hw.api_version) {
 625        case ixgbe_mbox_api_14:
 626                break;
 627        default:
 628                return;
 629        }
 630
 631        ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
 632        if (!ipsec)
 633                goto err1;
 634        hash_init(ipsec->rx_sa_list);
 635
 636        size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
 637        ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
 638        if (!ipsec->rx_tbl)
 639                goto err2;
 640
 641        size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
 642        ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
 643        if (!ipsec->tx_tbl)
 644                goto err2;
 645
 646        ipsec->num_rx_sa = 0;
 647        ipsec->num_tx_sa = 0;
 648
 649        adapter->ipsec = ipsec;
 650
 651        adapter->netdev->xfrmdev_ops = &ixgbevf_xfrmdev_ops;
 652
 653#define IXGBEVF_ESP_FEATURES    (NETIF_F_HW_ESP | \
 654                                 NETIF_F_HW_ESP_TX_CSUM | \
 655                                 NETIF_F_GSO_ESP)
 656
 657        adapter->netdev->features |= IXGBEVF_ESP_FEATURES;
 658        adapter->netdev->hw_enc_features |= IXGBEVF_ESP_FEATURES;
 659
 660        return;
 661
 662err2:
 663        kfree(ipsec->rx_tbl);
 664        kfree(ipsec->tx_tbl);
 665        kfree(ipsec);
 666err1:
 667        netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
 668}
 669
 670/**
 671 * ixgbevf_stop_ipsec_offload - tear down the IPsec offload
 672 * @adapter: board private structure
 673 **/
 674void ixgbevf_stop_ipsec_offload(struct ixgbevf_adapter *adapter)
 675{
 676        struct ixgbevf_ipsec *ipsec = adapter->ipsec;
 677
 678        adapter->ipsec = NULL;
 679        if (ipsec) {
 680                kfree(ipsec->rx_tbl);
 681                kfree(ipsec->tx_tbl);
 682                kfree(ipsec);
 683        }
 684}
 685