intel/ixgbevf/ipsec.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /* Copyright(c) 2018 Oracle and/or its affiliates. All rights reserved. */
0003
0004 #include "ixgbevf.h"
0005 #include <net/xfrm.h>
0006 #include <crypto/aead.h>
0007
0008 #define IXGBE_IPSEC_KEY_BITS  160
0009 static const char aes_gcm_name[] = "rfc4106(gcm(aes))";
0010
0011 /**
0012  * ixgbevf_ipsec_set_pf_sa - ask the PF to set up an SA
0013  * @adapter: board private structure
0014  * @xs: xfrm info to be sent to the PF
0015  *
0016  * Returns: positive offload handle from the PF, or negative error code
0017  **/
0018 static int ixgbevf_ipsec_set_pf_sa(struct ixgbevf_adapter *adapter,
0019                    struct xfrm_state *xs)
0020 {
0021     u32 msgbuf[IXGBE_VFMAILBOX_SIZE] = { 0 };
0022     struct ixgbe_hw *hw = &adapter->hw;
0023     struct sa_mbx_msg *sam;
0024     int ret;
0025
0026     /* send the important bits to the PF */
0027     sam = (struct sa_mbx_msg *)(&msgbuf[1]);
0028     sam->dir = xs->xso.dir;
0029     sam->spi = xs->id.spi;
0030     sam->proto = xs->id.proto;
0031     sam->family = xs->props.family;
0032
0033     if (xs->props.family == AF_INET6)
0034         memcpy(sam->addr, &xs->id.daddr.a6, sizeof(xs->id.daddr.a6));
0035     else
0036         memcpy(sam->addr, &xs->id.daddr.a4, sizeof(xs->id.daddr.a4));
0037     memcpy(sam->key, xs->aead->alg_key, sizeof(sam->key));
0038
0039     msgbuf[0] = IXGBE_VF_IPSEC_ADD;
0040
0041     spin_lock_bh(&adapter->mbx_lock);
0042
0043     ret = ixgbevf_write_mbx(hw, msgbuf, IXGBE_VFMAILBOX_SIZE);
0044     if (ret)
0045         goto out;
0046
0047     ret = ixgbevf_poll_mbx(hw, msgbuf, 2);
0048     if (ret)
0049         goto out;
0050
0051     ret = (int)msgbuf[1];
0052     if (msgbuf[0] & IXGBE_VT_MSGTYPE_FAILURE && ret >= 0)
0053         ret = -1;
0054
0055 out:
0056     spin_unlock_bh(&adapter->mbx_lock);
0057
0058     return ret;
0059 }
0060
0061 /**
0062  * ixgbevf_ipsec_del_pf_sa - ask the PF to delete an SA
0063  * @adapter: board private structure
0064  * @pfsa: sa index returned from PF when created, -1 for all
0065  *
0066  * Returns: 0 on success, or negative error code
0067  **/
0068 static int ixgbevf_ipsec_del_pf_sa(struct ixgbevf_adapter *adapter, int pfsa)
0069 {
0070     struct ixgbe_hw *hw = &adapter->hw;
0071     u32 msgbuf[2];
0072     int err;
0073
0074     memset(msgbuf, 0, sizeof(msgbuf));
0075     msgbuf[0] = IXGBE_VF_IPSEC_DEL;
0076     msgbuf[1] = (u32)pfsa;
0077
0078     spin_lock_bh(&adapter->mbx_lock);
0079
0080     err = ixgbevf_write_mbx(hw, msgbuf, 2);
0081     if (err)
0082         goto out;
0083
0084     err = ixgbevf_poll_mbx(hw, msgbuf, 2);
0085     if (err)
0086         goto out;
0087
0088 out:
0089     spin_unlock_bh(&adapter->mbx_lock);
0090     return err;
0091 }
0092
0093 /**
0094  * ixgbevf_ipsec_restore - restore the IPsec HW settings after a reset
0095  * @adapter: board private structure
0096  *
0097  * Reload the HW tables from the SW tables after they've been bashed
0098  * by a chip reset.  While we're here, make sure any stale VF data is
0099  * removed, since we go through reset when num_vfs changes.
0100  **/
0101 void ixgbevf_ipsec_restore(struct ixgbevf_adapter *adapter)
0102 {
0103     struct ixgbevf_ipsec *ipsec = adapter->ipsec;
0104     struct net_device *netdev = adapter->netdev;
0105     int i;
0106
0107     if (!(adapter->netdev->features & NETIF_F_HW_ESP))
0108         return;
0109
0110     /* reload the Rx and Tx keys */
0111     for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
0112         struct rx_sa *r = &ipsec->rx_tbl[i];
0113         struct tx_sa *t = &ipsec->tx_tbl[i];
0114         int ret;
0115
0116         if (r->used) {
0117             ret = ixgbevf_ipsec_set_pf_sa(adapter, r->xs);
0118             if (ret < 0)
0119                 netdev_err(netdev, "reload rx_tbl[%d] failed = %d\n",
0120                        i, ret);
0121         }
0122
0123         if (t->used) {
0124             ret = ixgbevf_ipsec_set_pf_sa(adapter, t->xs);
0125             if (ret < 0)
0126                 netdev_err(netdev, "reload tx_tbl[%d] failed = %d\n",
0127                        i, ret);
0128         }
0129     }
0130 }
0131
0132 /**
0133  * ixgbevf_ipsec_find_empty_idx - find the first unused security parameter index
0134  * @ipsec: pointer to IPsec struct
0135  * @rxtable: true if we need to look in the Rx table
0136  *
0137  * Returns the first unused index in either the Rx or Tx SA table
0138  **/
0139 static
0140 int ixgbevf_ipsec_find_empty_idx(struct ixgbevf_ipsec *ipsec, bool rxtable)
0141 {
0142     u32 i;
0143
0144     if (rxtable) {
0145         if (ipsec->num_rx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
0146             return -ENOSPC;
0147
0148         /* search rx sa table */
0149         for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
0150             if (!ipsec->rx_tbl[i].used)
0151                 return i;
0152         }
0153     } else {
0154         if (ipsec->num_tx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
0155             return -ENOSPC;
0156
0157         /* search tx sa table */
0158         for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
0159             if (!ipsec->tx_tbl[i].used)
0160                 return i;
0161         }
0162     }
0163
0164     return -ENOSPC;
0165 }
0166
0167 /**
0168  * ixgbevf_ipsec_find_rx_state - find the state that matches
0169  * @ipsec: pointer to IPsec struct
0170  * @daddr: inbound address to match
0171  * @proto: protocol to match
0172  * @spi: SPI to match
0173  * @ip4: true if using an IPv4 address
0174  *
0175  * Returns a pointer to the matching SA state information
0176  **/
0177 static
0178 struct xfrm_state *ixgbevf_ipsec_find_rx_state(struct ixgbevf_ipsec *ipsec,
0179                            __be32 *daddr, u8 proto,
0180                            __be32 spi, bool ip4)
0181 {
0182     struct xfrm_state *ret = NULL;
0183     struct rx_sa *rsa;
0184
0185     rcu_read_lock();
0186     hash_for_each_possible_rcu(ipsec->rx_sa_list, rsa, hlist,
0187                    (__force u32)spi) {
0188         if (spi == rsa->xs->id.spi &&
0189             ((ip4 && *daddr == rsa->xs->id.daddr.a4) ||
0190               (!ip4 && !memcmp(daddr, &rsa->xs->id.daddr.a6,
0191                        sizeof(rsa->xs->id.daddr.a6)))) &&
0192             proto == rsa->xs->id.proto) {
0193             ret = rsa->xs;
0194             xfrm_state_hold(ret);
0195             break;
0196         }
0197     }
0198     rcu_read_unlock();
0199     return ret;
0200 }
0201
0202 /**
0203  * ixgbevf_ipsec_parse_proto_keys - find the key and salt based on the protocol
0204  * @xs: pointer to xfrm_state struct
0205  * @mykey: pointer to key array to populate
0206  * @mysalt: pointer to salt value to populate
0207  *
0208  * This copies the protocol keys and salt to our own data tables.  The
0209  * 82599 family only supports the one algorithm.
0210  **/
0211 static int ixgbevf_ipsec_parse_proto_keys(struct xfrm_state *xs,
0212                       u32 *mykey, u32 *mysalt)
0213 {
0214     struct net_device *dev = xs->xso.real_dev;
0215     unsigned char *key_data;
0216     char *alg_name = NULL;
0217     int key_len;
0218
0219     if (!xs->aead) {
0220         netdev_err(dev, "Unsupported IPsec algorithm\n");
0221         return -EINVAL;
0222     }
0223
0224     if (xs->aead->alg_icv_len != IXGBE_IPSEC_AUTH_BITS) {
0225         netdev_err(dev, "IPsec offload requires %d bit authentication\n",
0226                IXGBE_IPSEC_AUTH_BITS);
0227         return -EINVAL;
0228     }
0229
0230     key_data = &xs->aead->alg_key[0];
0231     key_len = xs->aead->alg_key_len;
0232     alg_name = xs->aead->alg_name;
0233
0234     if (strcmp(alg_name, aes_gcm_name)) {
0235         netdev_err(dev, "Unsupported IPsec algorithm - please use %s\n",
0236                aes_gcm_name);
0237         return -EINVAL;
0238     }
0239
0240     /* The key bytes come down in a big endian array of bytes, so
0241      * we don't need to do any byte swapping.
0242      * 160 accounts for 16 byte key and 4 byte salt
0243      */
0244     if (key_len > IXGBE_IPSEC_KEY_BITS) {
0245         *mysalt = ((u32 *)key_data)[4];
0246     } else if (key_len == IXGBE_IPSEC_KEY_BITS) {
0247         *mysalt = 0;
0248     } else {
0249         netdev_err(dev, "IPsec hw offload only supports keys up to 128 bits with a 32 bit salt\n");
0250         return -EINVAL;
0251     }
0252     memcpy(mykey, key_data, 16);
0253
0254     return 0;
0255 }
0256
0257 /**
0258  * ixgbevf_ipsec_add_sa - program device with a security association
0259  * @xs: pointer to transformer state struct
0260  **/
0261 static int ixgbevf_ipsec_add_sa(struct xfrm_state *xs)
0262 {
0263     struct net_device *dev = xs->xso.real_dev;
0264     struct ixgbevf_adapter *adapter;
0265     struct ixgbevf_ipsec *ipsec;
0266     u16 sa_idx;
0267     int ret;
0268
0269     adapter = netdev_priv(dev);
0270     ipsec = adapter->ipsec;
0271
0272     if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
0273         netdev_err(dev, "Unsupported protocol 0x%04x for IPsec offload\n",
0274                xs->id.proto);
0275         return -EINVAL;
0276     }
0277
0278     if (xs->props.mode != XFRM_MODE_TRANSPORT) {
0279         netdev_err(dev, "Unsupported mode for ipsec offload\n");
0280         return -EINVAL;
0281     }
0282
0283     if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
0284         struct rx_sa rsa;
0285
0286         if (xs->calg) {
0287             netdev_err(dev, "Compression offload not supported\n");
0288             return -EINVAL;
0289         }
0290
0291         /* find the first unused index */
0292         ret = ixgbevf_ipsec_find_empty_idx(ipsec, true);
0293         if (ret < 0) {
0294             netdev_err(dev, "No space for SA in Rx table!\n");
0295             return ret;
0296         }
0297         sa_idx = (u16)ret;
0298
0299         memset(&rsa, 0, sizeof(rsa));
0300         rsa.used = true;
0301         rsa.xs = xs;
0302
0303         if (rsa.xs->id.proto & IPPROTO_ESP)
0304             rsa.decrypt = xs->ealg || xs->aead;
0305
0306         /* get the key and salt */
0307         ret = ixgbevf_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
0308         if (ret) {
0309             netdev_err(dev, "Failed to get key data for Rx SA table\n");
0310             return ret;
0311         }
0312
0313         /* get ip for rx sa table */
0314         if (xs->props.family == AF_INET6)
0315             memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
0316         else
0317             memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
0318
0319         rsa.mode = IXGBE_RXMOD_VALID;
0320         if (rsa.xs->id.proto & IPPROTO_ESP)
0321             rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
0322         if (rsa.decrypt)
0323             rsa.mode |= IXGBE_RXMOD_DECRYPT;
0324         if (rsa.xs->props.family == AF_INET6)
0325             rsa.mode |= IXGBE_RXMOD_IPV6;
0326
0327         ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
0328         if (ret < 0)
0329             return ret;
0330         rsa.pfsa = ret;
0331
0332         /* the preparations worked, so save the info */
0333         memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
0334
0335         xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
0336
0337         ipsec->num_rx_sa++;
0338
0339         /* hash the new entry for faster search in Rx path */
0340         hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
0341                  (__force u32)rsa.xs->id.spi);
0342     } else {
0343         struct tx_sa tsa;
0344
0345         /* find the first unused index */
0346         ret = ixgbevf_ipsec_find_empty_idx(ipsec, false);
0347         if (ret < 0) {
0348             netdev_err(dev, "No space for SA in Tx table\n");
0349             return ret;
0350         }
0351         sa_idx = (u16)ret;
0352
0353         memset(&tsa, 0, sizeof(tsa));
0354         tsa.used = true;
0355         tsa.xs = xs;
0356
0357         if (xs->id.proto & IPPROTO_ESP)
0358             tsa.encrypt = xs->ealg || xs->aead;
0359
0360         ret = ixgbevf_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
0361         if (ret) {
0362             netdev_err(dev, "Failed to get key data for Tx SA table\n");
0363             memset(&tsa, 0, sizeof(tsa));
0364             return ret;
0365         }
0366
0367         ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
0368         if (ret < 0)
0369             return ret;
0370         tsa.pfsa = ret;
0371
0372         /* the preparations worked, so save the info */
0373         memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
0374
0375         xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
0376
0377         ipsec->num_tx_sa++;
0378     }
0379
0380     return 0;
0381 }
0382
0383 /**
0384  * ixgbevf_ipsec_del_sa - clear out this specific SA
0385  * @xs: pointer to transformer state struct
0386  **/
0387 static void ixgbevf_ipsec_del_sa(struct xfrm_state *xs)
0388 {
0389     struct net_device *dev = xs->xso.real_dev;
0390     struct ixgbevf_adapter *adapter;
0391     struct ixgbevf_ipsec *ipsec;
0392     u16 sa_idx;
0393
0394     adapter = netdev_priv(dev);
0395     ipsec = adapter->ipsec;
0396
0397     if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
0398         sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
0399
0400         if (!ipsec->rx_tbl[sa_idx].used) {
0401             netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
0402                    sa_idx, xs->xso.offload_handle);
0403             return;
0404         }
0405
0406         ixgbevf_ipsec_del_pf_sa(adapter, ipsec->rx_tbl[sa_idx].pfsa);
0407         hash_del_rcu(&ipsec->rx_tbl[sa_idx].hlist);
0408         memset(&ipsec->rx_tbl[sa_idx], 0, sizeof(struct rx_sa));
0409         ipsec->num_rx_sa--;
0410     } else {
0411         sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
0412
0413         if (!ipsec->tx_tbl[sa_idx].used) {
0414             netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
0415                    sa_idx, xs->xso.offload_handle);
0416             return;
0417         }
0418
0419         ixgbevf_ipsec_del_pf_sa(adapter, ipsec->tx_tbl[sa_idx].pfsa);
0420         memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
0421         ipsec->num_tx_sa--;
0422     }
0423 }
0424
0425 /**
0426  * ixgbevf_ipsec_offload_ok - can this packet use the xfrm hw offload
0427  * @skb: current data packet
0428  * @xs: pointer to transformer state struct
0429  **/
0430 static bool ixgbevf_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
0431 {
0432     if (xs->props.family == AF_INET) {
0433         /* Offload with IPv4 options is not supported yet */
0434         if (ip_hdr(skb)->ihl != 5)
0435             return false;
0436     } else {
0437         /* Offload with IPv6 extension headers is not support yet */
0438         if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
0439             return false;
0440     }
0441
0442     return true;
0443 }
0444
0445 static const struct xfrmdev_ops ixgbevf_xfrmdev_ops = {
0446     .xdo_dev_state_add = ixgbevf_ipsec_add_sa,
0447     .xdo_dev_state_delete = ixgbevf_ipsec_del_sa,
0448     .xdo_dev_offload_ok = ixgbevf_ipsec_offload_ok,
0449 };
0450
0451 /**
0452  * ixgbevf_ipsec_tx - setup Tx flags for IPsec offload
0453  * @tx_ring: outgoing context
0454  * @first: current data packet
0455  * @itd: ipsec Tx data for later use in building context descriptor
0456  **/
0457 int ixgbevf_ipsec_tx(struct ixgbevf_ring *tx_ring,
0458              struct ixgbevf_tx_buffer *first,
0459              struct ixgbevf_ipsec_tx_data *itd)
0460 {
0461     struct ixgbevf_adapter *adapter = netdev_priv(tx_ring->netdev);
0462     struct ixgbevf_ipsec *ipsec = adapter->ipsec;
0463     struct xfrm_state *xs;
0464     struct sec_path *sp;
0465     struct tx_sa *tsa;
0466     u16 sa_idx;
0467
0468     sp = skb_sec_path(first->skb);
0469     if (unlikely(!sp->len)) {
0470         netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
0471                __func__, sp->len);
0472         return 0;
0473     }
0474
0475     xs = xfrm_input_state(first->skb);
0476     if (unlikely(!xs)) {
0477         netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
0478                __func__, xs);
0479         return 0;
0480     }
0481
0482     sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
0483     if (unlikely(sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
0484         netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
0485                __func__, sa_idx, xs->xso.offload_handle);
0486         return 0;
0487     }
0488
0489     tsa = &ipsec->tx_tbl[sa_idx];
0490     if (unlikely(!tsa->used)) {
0491         netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
0492                __func__, sa_idx);
0493         return 0;
0494     }
0495
0496     itd->pfsa = tsa->pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
0497
0498     first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CSUM;
0499
0500     if (xs->id.proto == IPPROTO_ESP) {
0501         itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
0502                   IXGBE_ADVTXD_TUCMD_L4T_TCP;
0503         if (first->protocol == htons(ETH_P_IP))
0504             itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
0505
0506         /* The actual trailer length is authlen (16 bytes) plus
0507          * 2 bytes for the proto and the padlen values, plus
0508          * padlen bytes of padding.  This ends up not the same
0509          * as the static value found in xs->props.trailer_len (21).
0510          *
0511          * ... but if we're doing GSO, don't bother as the stack
0512          * doesn't add a trailer for those.
0513          */
0514         if (!skb_is_gso(first->skb)) {
0515             /* The "correct" way to get the auth length would be
0516              * to use
0517              *    authlen = crypto_aead_authsize(xs->data);
0518              * but since we know we only have one size to worry
0519              * about * we can let the compiler use the constant
0520              * and save us a few CPU cycles.
0521              */
0522             const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
0523             struct sk_buff *skb = first->skb;
0524             u8 padlen;
0525             int ret;
0526
0527             ret = skb_copy_bits(skb, skb->len - (authlen + 2),
0528                         &padlen, 1);
0529             if (unlikely(ret))
0530                 return 0;
0531             itd->trailer_len = authlen + 2 + padlen;
0532         }
0533     }
0534     if (tsa->encrypt)
0535         itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
0536
0537     return 1;
0538 }
0539
0540 /**
0541  * ixgbevf_ipsec_rx - decode IPsec bits from Rx descriptor
0542  * @rx_ring: receiving ring
0543  * @rx_desc: receive data descriptor
0544  * @skb: current data packet
0545  *
0546  * Determine if there was an IPsec encapsulation noticed, and if so set up
0547  * the resulting status for later in the receive stack.
0548  **/
0549 void ixgbevf_ipsec_rx(struct ixgbevf_ring *rx_ring,
0550               union ixgbe_adv_rx_desc *rx_desc,
0551               struct sk_buff *skb)
0552 {
0553     struct ixgbevf_adapter *adapter = netdev_priv(rx_ring->netdev);
0554     __le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
0555     __le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
0556                          IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
0557     struct ixgbevf_ipsec *ipsec = adapter->ipsec;
0558     struct xfrm_offload *xo = NULL;
0559     struct xfrm_state *xs = NULL;
0560     struct ipv6hdr *ip6 = NULL;
0561     struct iphdr *ip4 = NULL;
0562     struct sec_path *sp;
0563     void *daddr;
0564     __be32 spi;
0565     u8 *c_hdr;
0566     u8 proto;
0567
0568     /* Find the IP and crypto headers in the data.
0569      * We can assume no VLAN header in the way, b/c the
0570      * hw won't recognize the IPsec packet and anyway the
0571      * currently VLAN device doesn't support xfrm offload.
0572      */
0573     if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
0574         ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
0575         daddr = &ip4->daddr;
0576         c_hdr = (u8 *)ip4 + ip4->ihl * 4;
0577     } else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
0578         ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
0579         daddr = &ip6->daddr;
0580         c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
0581     } else {
0582         return;
0583     }
0584
0585     switch (pkt_info & ipsec_pkt_types) {
0586     case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
0587         spi = ((struct ip_auth_hdr *)c_hdr)->spi;
0588         proto = IPPROTO_AH;
0589         break;
0590     case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
0591         spi = ((struct ip_esp_hdr *)c_hdr)->spi;
0592         proto = IPPROTO_ESP;
0593         break;
0594     default:
0595         return;
0596     }
0597
0598     xs = ixgbevf_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
0599     if (unlikely(!xs))
0600         return;
0601
0602     sp = secpath_set(skb);
0603     if (unlikely(!sp))
0604         return;
0605
0606     sp->xvec[sp->len++] = xs;
0607     sp->olen++;
0608     xo = xfrm_offload(skb);
0609     xo->flags = CRYPTO_DONE;
0610     xo->status = CRYPTO_SUCCESS;
0611
0612     adapter->rx_ipsec++;
0613 }
0614
0615 /**
0616  * ixgbevf_init_ipsec_offload - initialize registers for IPsec operation
0617  * @adapter: board private structure
0618  **/
0619 void ixgbevf_init_ipsec_offload(struct ixgbevf_adapter *adapter)
0620 {
0621     struct ixgbevf_ipsec *ipsec;
0622     size_t size;
0623
0624     switch (adapter->hw.api_version) {
0625     case ixgbe_mbox_api_14:
0626     case ixgbe_mbox_api_15:
0627         break;
0628     default:
0629         return;
0630     }
0631
0632     ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
0633     if (!ipsec)
0634         goto err1;
0635     hash_init(ipsec->rx_sa_list);
0636
0637     size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
0638     ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
0639     if (!ipsec->rx_tbl)
0640         goto err2;
0641
0642     size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
0643     ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
0644     if (!ipsec->tx_tbl)
0645         goto err2;
0646
0647     ipsec->num_rx_sa = 0;
0648     ipsec->num_tx_sa = 0;
0649
0650     adapter->ipsec = ipsec;
0651
0652     adapter->netdev->xfrmdev_ops = &ixgbevf_xfrmdev_ops;
0653
0654 #define IXGBEVF_ESP_FEATURES    (NETIF_F_HW_ESP | \
0655                  NETIF_F_HW_ESP_TX_CSUM | \
0656                  NETIF_F_GSO_ESP)
0657
0658     adapter->netdev->features |= IXGBEVF_ESP_FEATURES;
0659     adapter->netdev->hw_enc_features |= IXGBEVF_ESP_FEATURES;
0660
0661     return;
0662
0663 err2:
0664     kfree(ipsec->rx_tbl);
0665     kfree(ipsec->tx_tbl);
0666     kfree(ipsec);
0667 err1:
0668     netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
0669 }
0670
0671 /**
0672  * ixgbevf_stop_ipsec_offload - tear down the IPsec offload
0673  * @adapter: board private structure
0674  **/
0675 void ixgbevf_stop_ipsec_offload(struct ixgbevf_adapter *adapter)
0676 {
0677     struct ixgbevf_ipsec *ipsec = adapter->ipsec;
0678
0679     adapter->ipsec = NULL;
0680     if (ipsec) {
0681         kfree(ipsec->rx_tbl);
0682         kfree(ipsec->tx_tbl);
0683         kfree(ipsec);
0684     }
0685 }