1 files changed, 685 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ixgbevf/ipsec.c b/drivers/net/ethernet/intel/ixgbevf/ipsec.c
new file mode 100644
index 000000000..9984ebc62
--- /dev/null
+++ b/drivers/net/ethernet/intel/ixgbevf/ipsec.c
@@ -0,0 +1,685 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2018 Oracle and/or its affiliates. All rights reserved. */
+
+#include "ixgbevf.h"
+#include <net/xfrm.h>
+#include <crypto/aead.h>
+
+#define IXGBE_IPSEC_KEY_BITS  160
+static const char aes_gcm_name[] = "rfc4106(gcm(aes))";
+
+/**
+ * ixgbevf_ipsec_set_pf_sa - ask the PF to set up an SA
+ * @adapter: board private structure
+ * @xs: xfrm info to be sent to the PF
+ *
+ * Returns: positive offload handle from the PF, or negative error code
+ **/
+static int ixgbevf_ipsec_set_pf_sa(struct ixgbevf_adapter *adapter,
+				   struct xfrm_state *xs)
+{
+	u32 msgbuf[IXGBE_VFMAILBOX_SIZE] = { 0 };
+	struct ixgbe_hw *hw = &adapter->hw;
+	struct sa_mbx_msg *sam;
+	int ret;
+
+	/* send the important bits to the PF */
+	sam = (struct sa_mbx_msg *)(&msgbuf[1]);
+	sam->dir = xs->xso.dir;
+	sam->spi = xs->id.spi;
+	sam->proto = xs->id.proto;
+	sam->family = xs->props.family;
+
+	if (xs->props.family == AF_INET6)
+		memcpy(sam->addr, &xs->id.daddr.a6, sizeof(xs->id.daddr.a6));
+	else
+		memcpy(sam->addr, &xs->id.daddr.a4, sizeof(xs->id.daddr.a4));
+	memcpy(sam->key, xs->aead->alg_key, sizeof(sam->key));
+
+	msgbuf[0] = IXGBE_VF_IPSEC_ADD;
+
+	spin_lock_bh(&adapter->mbx_lock);
+
+	ret = ixgbevf_write_mbx(hw, msgbuf, IXGBE_VFMAILBOX_SIZE);
+	if (ret)
+		goto out;
+
+	ret = ixgbevf_poll_mbx(hw, msgbuf, 2);
+	if (ret)
+		goto out;
+
+	ret = (int)msgbuf[1];
+	if (msgbuf[0] & IXGBE_VT_MSGTYPE_FAILURE && ret >= 0)
+		ret = -1;
+
+out:
+	spin_unlock_bh(&adapter->mbx_lock);
+
+	return ret;
+}
+
+/**
+ * ixgbevf_ipsec_del_pf_sa - ask the PF to delete an SA
+ * @adapter: board private structure
+ * @pfsa: sa index returned from PF when created, -1 for all
+ *
+ * Returns: 0 on success, or negative error code
+ **/
+static int ixgbevf_ipsec_del_pf_sa(struct ixgbevf_adapter *adapter, int pfsa)
+{
+	struct ixgbe_hw *hw = &adapter->hw;
+	u32 msgbuf[2];
+	int err;
+
+	memset(msgbuf, 0, sizeof(msgbuf));
+	msgbuf[0] = IXGBE_VF_IPSEC_DEL;
+	msgbuf[1] = (u32)pfsa;
+
+	spin_lock_bh(&adapter->mbx_lock);
+
+	err = ixgbevf_write_mbx(hw, msgbuf, 2);
+	if (err)
+		goto out;
+
+	err = ixgbevf_poll_mbx(hw, msgbuf, 2);
+	if (err)
+		goto out;
+
+out:
+	spin_unlock_bh(&adapter->mbx_lock);
+	return err;
+}
+
+/**
+ * ixgbevf_ipsec_restore - restore the IPsec HW settings after a reset
+ * @adapter: board private structure
+ *
+ * Reload the HW tables from the SW tables after they've been bashed
+ * by a chip reset.  While we're here, make sure any stale VF data is
+ * removed, since we go through reset when num_vfs changes.
+ **/
+void ixgbevf_ipsec_restore(struct ixgbevf_adapter *adapter)
+{
+	struct ixgbevf_ipsec *ipsec = adapter->ipsec;
+	struct net_device *netdev = adapter->netdev;
+	int i;
+
+	if (!(adapter->netdev->features & NETIF_F_HW_ESP))
+		return;
+
+	/* reload the Rx and Tx keys */
+	for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
+		struct rx_sa *r = &ipsec->rx_tbl[i];
+		struct tx_sa *t = &ipsec->tx_tbl[i];
+		int ret;
+
+		if (r->used) {
+			ret = ixgbevf_ipsec_set_pf_sa(adapter, r->xs);
+			if (ret < 0)
+				netdev_err(netdev, "reload rx_tbl[%d] failed = %d\n",
+					   i, ret);
+		}
+
+		if (t->used) {
+			ret = ixgbevf_ipsec_set_pf_sa(adapter, t->xs);
+			if (ret < 0)
+				netdev_err(netdev, "reload tx_tbl[%d] failed = %d\n",
+					   i, ret);
+		}
+	}
+}
+
+/**
+ * ixgbevf_ipsec_find_empty_idx - find the first unused security parameter index
+ * @ipsec: pointer to IPsec struct
+ * @rxtable: true if we need to look in the Rx table
+ *
+ * Returns the first unused index in either the Rx or Tx SA table
+ **/
+static
+int ixgbevf_ipsec_find_empty_idx(struct ixgbevf_ipsec *ipsec, bool rxtable)
+{
+	u32 i;
+
+	if (rxtable) {
+		if (ipsec->num_rx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
+			return -ENOSPC;
+
+		/* search rx sa table */
+		for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
+			if (!ipsec->rx_tbl[i].used)
+				return i;
+		}
+	} else {
+		if (ipsec->num_tx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
+			return -ENOSPC;
+
+		/* search tx sa table */
+		for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
+			if (!ipsec->tx_tbl[i].used)
+				return i;
+		}
+	}
+
+	return -ENOSPC;
+}
+
+/**
+ * ixgbevf_ipsec_find_rx_state - find the state that matches
+ * @ipsec: pointer to IPsec struct
+ * @daddr: inbound address to match
+ * @proto: protocol to match
+ * @spi: SPI to match
+ * @ip4: true if using an IPv4 address
+ *
+ * Returns a pointer to the matching SA state information
+ **/
+static
+struct xfrm_state *ixgbevf_ipsec_find_rx_state(struct ixgbevf_ipsec *ipsec,
+					       __be32 *daddr, u8 proto,
+					       __be32 spi, bool ip4)
+{
+	struct xfrm_state *ret = NULL;
+	struct rx_sa *rsa;
+
+	rcu_read_lock();
+	hash_for_each_possible_rcu(ipsec->rx_sa_list, rsa, hlist,
+				   (__force u32)spi) {
+		if (spi == rsa->xs->id.spi &&
+		    ((ip4 && *daddr == rsa->xs->id.daddr.a4) ||
+		      (!ip4 && !memcmp(daddr, &rsa->xs->id.daddr.a6,
+				       sizeof(rsa->xs->id.daddr.a6)))) &&
+		    proto == rsa->xs->id.proto) {
+			ret = rsa->xs;
+			xfrm_state_hold(ret);
+			break;
+		}
+	}
+	rcu_read_unlock();
+	return ret;
+}
+
+/**
+ * ixgbevf_ipsec_parse_proto_keys - find the key and salt based on the protocol
+ * @xs: pointer to xfrm_state struct
+ * @mykey: pointer to key array to populate
+ * @mysalt: pointer to salt value to populate
+ *
+ * This copies the protocol keys and salt to our own data tables.  The
+ * 82599 family only supports the one algorithm.
+ **/
+static int ixgbevf_ipsec_parse_proto_keys(struct xfrm_state *xs,
+					  u32 *mykey, u32 *mysalt)
+{
+	struct net_device *dev = xs->xso.real_dev;
+	unsigned char *key_data;
+	char *alg_name = NULL;
+	int key_len;
+
+	if (!xs->aead) {
+		netdev_err(dev, "Unsupported IPsec algorithm\n");
+		return -EINVAL;
+	}
+
+	if (xs->aead->alg_icv_len != IXGBE_IPSEC_AUTH_BITS) {
+		netdev_err(dev, "IPsec offload requires %d bit authentication\n",
+			   IXGBE_IPSEC_AUTH_BITS);
+		return -EINVAL;
+	}
+
+	key_data = &xs->aead->alg_key[0];
+	key_len = xs->aead->alg_key_len;
+	alg_name = xs->aead->alg_name;
+
+	if (strcmp(alg_name, aes_gcm_name)) {
+		netdev_err(dev, "Unsupported IPsec algorithm - please use %s\n",
+			   aes_gcm_name);
+		return -EINVAL;
+	}
+
+	/* The key bytes come down in a big endian array of bytes, so
+	 * we don't need to do any byte swapping.
+	 * 160 accounts for 16 byte key and 4 byte salt
+	 */
+	if (key_len > IXGBE_IPSEC_KEY_BITS) {
+		*mysalt = ((u32 *)key_data)[4];
+	} else if (key_len == IXGBE_IPSEC_KEY_BITS) {
+		*mysalt = 0;
+	} else {
+		netdev_err(dev, "IPsec hw offload only supports keys up to 128 bits with a 32 bit salt\n");
+		return -EINVAL;
+	}
+	memcpy(mykey, key_data, 16);
+
+	return 0;
+}
+
+/**
+ * ixgbevf_ipsec_add_sa - program device with a security association
+ * @xs: pointer to transformer state struct
+ **/
+static int ixgbevf_ipsec_add_sa(struct xfrm_state *xs)
+{
+	struct net_device *dev = xs->xso.real_dev;
+	struct ixgbevf_adapter *adapter;
+	struct ixgbevf_ipsec *ipsec;
+	u16 sa_idx;
+	int ret;
+
+	adapter = netdev_priv(dev);
+	ipsec = adapter->ipsec;
+
+	if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
+		netdev_err(dev, "Unsupported protocol 0x%04x for IPsec offload\n",
+			   xs->id.proto);
+		return -EINVAL;
+	}
+
+	if (xs->props.mode != XFRM_MODE_TRANSPORT) {
+		netdev_err(dev, "Unsupported mode for ipsec offload\n");
+		return -EINVAL;
+	}
+
+	if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
+		struct rx_sa rsa;
+
+		if (xs->calg) {
+			netdev_err(dev, "Compression offload not supported\n");
+			return -EINVAL;
+		}
+
+		/* find the first unused index */
+		ret = ixgbevf_ipsec_find_empty_idx(ipsec, true);
+		if (ret < 0) {
+			netdev_err(dev, "No space for SA in Rx table!\n");
+			return ret;
+		}
+		sa_idx = (u16)ret;
+
+		memset(&rsa, 0, sizeof(rsa));
+		rsa.used = true;
+		rsa.xs = xs;
+
+		if (rsa.xs->id.proto & IPPROTO_ESP)
+			rsa.decrypt = xs->ealg || xs->aead;
+
+		/* get the key and salt */
+		ret = ixgbevf_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
+		if (ret) {
+			netdev_err(dev, "Failed to get key data for Rx SA table\n");
+			return ret;
+		}
+
+		/* get ip for rx sa table */
+		if (xs->props.family == AF_INET6)
+			memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
+		else
+			memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
+
+		rsa.mode = IXGBE_RXMOD_VALID;
+		if (rsa.xs->id.proto & IPPROTO_ESP)
+			rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
+		if (rsa.decrypt)
+			rsa.mode |= IXGBE_RXMOD_DECRYPT;
+		if (rsa.xs->props.family == AF_INET6)
+			rsa.mode |= IXGBE_RXMOD_IPV6;
+
+		ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
+		if (ret < 0)
+			return ret;
+		rsa.pfsa = ret;
+
+		/* the preparations worked, so save the info */
+		memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
+
+		xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
+
+		ipsec->num_rx_sa++;
+
+		/* hash the new entry for faster search in Rx path */
+		hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
+			     (__force u32)rsa.xs->id.spi);
+	} else {
+		struct tx_sa tsa;
+
+		/* find the first unused index */
+		ret = ixgbevf_ipsec_find_empty_idx(ipsec, false);
+		if (ret < 0) {
+			netdev_err(dev, "No space for SA in Tx table\n");
+			return ret;
+		}
+		sa_idx = (u16)ret;
+
+		memset(&tsa, 0, sizeof(tsa));
+		tsa.used = true;
+		tsa.xs = xs;
+
+		if (xs->id.proto & IPPROTO_ESP)
+			tsa.encrypt = xs->ealg || xs->aead;
+
+		ret = ixgbevf_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
+		if (ret) {
+			netdev_err(dev, "Failed to get key data for Tx SA table\n");
+			memset(&tsa, 0, sizeof(tsa));
+			return ret;
+		}
+
+		ret = ixgbevf_ipsec_set_pf_sa(adapter, xs);
+		if (ret < 0)
+			return ret;
+		tsa.pfsa = ret;
+
+		/* the preparations worked, so save the info */
+		memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
+
+		xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
+
+		ipsec->num_tx_sa++;
+	}
+
+	return 0;
+}
+
+/**
+ * ixgbevf_ipsec_del_sa - clear out this specific SA
+ * @xs: pointer to transformer state struct
+ **/
+static void ixgbevf_ipsec_del_sa(struct xfrm_state *xs)
+{
+	struct net_device *dev = xs->xso.real_dev;
+	struct ixgbevf_adapter *adapter;
+	struct ixgbevf_ipsec *ipsec;
+	u16 sa_idx;
+
+	adapter = netdev_priv(dev);
+	ipsec = adapter->ipsec;
+
+	if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
+		sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
+
+		if (!ipsec->rx_tbl[sa_idx].used) {
+			netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
+				   sa_idx, xs->xso.offload_handle);
+			return;
+		}
+
+		ixgbevf_ipsec_del_pf_sa(adapter, ipsec->rx_tbl[sa_idx].pfsa);
+		hash_del_rcu(&ipsec->rx_tbl[sa_idx].hlist);
+		memset(&ipsec->rx_tbl[sa_idx], 0, sizeof(struct rx_sa));
+		ipsec->num_rx_sa--;
+	} else {
+		sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
+
+		if (!ipsec->tx_tbl[sa_idx].used) {
+			netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
+				   sa_idx, xs->xso.offload_handle);
+			return;
+		}
+
+		ixgbevf_ipsec_del_pf_sa(adapter, ipsec->tx_tbl[sa_idx].pfsa);
+		memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
+		ipsec->num_tx_sa--;
+	}
+}
+
+/**
+ * ixgbevf_ipsec_offload_ok - can this packet use the xfrm hw offload
+ * @skb: current data packet
+ * @xs: pointer to transformer state struct
+ **/
+static bool ixgbevf_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
+{
+	if (xs->props.family == AF_INET) {
+		/* Offload with IPv4 options is not supported yet */
+		if (ip_hdr(skb)->ihl != 5)
+			return false;
+	} else {
+		/* Offload with IPv6 extension headers is not support yet */
+		if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
+			return false;
+	}
+
+	return true;
+}
+
+static const struct xfrmdev_ops ixgbevf_xfrmdev_ops = {
+	.xdo_dev_state_add = ixgbevf_ipsec_add_sa,
+	.xdo_dev_state_delete = ixgbevf_ipsec_del_sa,
+	.xdo_dev_offload_ok = ixgbevf_ipsec_offload_ok,
+};
+
+/**
+ * ixgbevf_ipsec_tx - setup Tx flags for IPsec offload
+ * @tx_ring: outgoing context
+ * @first: current data packet
+ * @itd: ipsec Tx data for later use in building context descriptor
+ **/
+int ixgbevf_ipsec_tx(struct ixgbevf_ring *tx_ring,
+		     struct ixgbevf_tx_buffer *first,
+		     struct ixgbevf_ipsec_tx_data *itd)
+{
+	struct ixgbevf_adapter *adapter = netdev_priv(tx_ring->netdev);
+	struct ixgbevf_ipsec *ipsec = adapter->ipsec;
+	struct xfrm_state *xs;
+	struct sec_path *sp;
+	struct tx_sa *tsa;
+	u16 sa_idx;
+
+	sp = skb_sec_path(first->skb);
+	if (unlikely(!sp->len)) {
+		netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
+			   __func__, sp->len);
+		return 0;
+	}
+
+	xs = xfrm_input_state(first->skb);
+	if (unlikely(!xs)) {
+		netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
+			   __func__, xs);
+		return 0;
+	}
+
+	sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
+	if (unlikely(sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
+		netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
+			   __func__, sa_idx, xs->xso.offload_handle);
+		return 0;
+	}
+
+	tsa = &ipsec->tx_tbl[sa_idx];
+	if (unlikely(!tsa->used)) {
+		netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
+			   __func__, sa_idx);
+		return 0;
+	}
+
+	itd->pfsa = tsa->pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
+
+	first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CSUM;
+
+	if (xs->id.proto == IPPROTO_ESP) {
+		itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
+			      IXGBE_ADVTXD_TUCMD_L4T_TCP;
+		if (first->protocol == htons(ETH_P_IP))
+			itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
+
+		/* The actual trailer length is authlen (16 bytes) plus
+		 * 2 bytes for the proto and the padlen values, plus
+		 * padlen bytes of padding.  This ends up not the same
+		 * as the static value found in xs->props.trailer_len (21).
+		 *
+		 * ... but if we're doing GSO, don't bother as the stack
+		 * doesn't add a trailer for those.
+		 */
+		if (!skb_is_gso(first->skb)) {
+			/* The "correct" way to get the auth length would be
+			 * to use
+			 *    authlen = crypto_aead_authsize(xs->data);
+			 * but since we know we only have one size to worry
+			 * about * we can let the compiler use the constant
+			 * and save us a few CPU cycles.
+			 */
+			const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
+			struct sk_buff *skb = first->skb;
+			u8 padlen;
+			int ret;
+
+			ret = skb_copy_bits(skb, skb->len - (authlen + 2),
+					    &padlen, 1);
+			if (unlikely(ret))
+				return 0;
+			itd->trailer_len = authlen + 2 + padlen;
+		}
+	}
+	if (tsa->encrypt)
+		itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
+
+	return 1;
+}
+
+/**
+ * ixgbevf_ipsec_rx - decode IPsec bits from Rx descriptor
+ * @rx_ring: receiving ring
+ * @rx_desc: receive data descriptor
+ * @skb: current data packet
+ *
+ * Determine if there was an IPsec encapsulation noticed, and if so set up
+ * the resulting status for later in the receive stack.
+ **/
+void ixgbevf_ipsec_rx(struct ixgbevf_ring *rx_ring,
+		      union ixgbe_adv_rx_desc *rx_desc,
+		      struct sk_buff *skb)
+{
+	struct ixgbevf_adapter *adapter = netdev_priv(rx_ring->netdev);
+	__le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
+	__le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
+					     IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
+	struct ixgbevf_ipsec *ipsec = adapter->ipsec;
+	struct xfrm_offload *xo = NULL;
+	struct xfrm_state *xs = NULL;
+	struct ipv6hdr *ip6 = NULL;
+	struct iphdr *ip4 = NULL;
+	struct sec_path *sp;
+	void *daddr;
+	__be32 spi;
+	u8 *c_hdr;
+	u8 proto;
+
+	/* Find the IP and crypto headers in the data.
+	 * We can assume no VLAN header in the way, b/c the
+	 * hw won't recognize the IPsec packet and anyway the
+	 * currently VLAN device doesn't support xfrm offload.
+	 */
+	if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
+		ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
+		daddr = &ip4->daddr;
+		c_hdr = (u8 *)ip4 + ip4->ihl * 4;
+	} else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
+		ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
+		daddr = &ip6->daddr;
+		c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
+	} else {
+		return;
+	}
+
+	switch (pkt_info & ipsec_pkt_types) {
+	case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
+		spi = ((struct ip_auth_hdr *)c_hdr)->spi;
+		proto = IPPROTO_AH;
+		break;
+	case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
+		spi = ((struct ip_esp_hdr *)c_hdr)->spi;
+		proto = IPPROTO_ESP;
+		break;
+	default:
+		return;
+	}
+
+	xs = ixgbevf_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
+	if (unlikely(!xs))
+		return;
+
+	sp = secpath_set(skb);
+	if (unlikely(!sp))
+		return;
+
+	sp->xvec[sp->len++] = xs;
+	sp->olen++;
+	xo = xfrm_offload(skb);
+	xo->flags = CRYPTO_DONE;
+	xo->status = CRYPTO_SUCCESS;
+
+	adapter->rx_ipsec++;
+}
+
+/**
+ * ixgbevf_init_ipsec_offload - initialize registers for IPsec operation
+ * @adapter: board private structure
+ **/
+void ixgbevf_init_ipsec_offload(struct ixgbevf_adapter *adapter)
+{
+	struct ixgbevf_ipsec *ipsec;
+	size_t size;
+
+	switch (adapter->hw.api_version) {
+	case ixgbe_mbox_api_14:
+	case ixgbe_mbox_api_15:
+		break;
+	default:
+		return;
+	}
+
+	ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
+	if (!ipsec)
+		goto err1;
+	hash_init(ipsec->rx_sa_list);
+
+	size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
+	ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
+	if (!ipsec->rx_tbl)
+		goto err2;
+
+	size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
+	ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
+	if (!ipsec->tx_tbl)
+		goto err2;
+
+	ipsec->num_rx_sa = 0;
+	ipsec->num_tx_sa = 0;
+
+	adapter->ipsec = ipsec;
+
+	adapter->netdev->xfrmdev_ops = &ixgbevf_xfrmdev_ops;
+
+#define IXGBEVF_ESP_FEATURES	(NETIF_F_HW_ESP | \
+				 NETIF_F_HW_ESP_TX_CSUM | \
+				 NETIF_F_GSO_ESP)
+
+	adapter->netdev->features |= IXGBEVF_ESP_FEATURES;
+	adapter->netdev->hw_enc_features |= IXGBEVF_ESP_FEATURES;
+
+	return;
+
+err2:
+	kfree(ipsec->rx_tbl);
+	kfree(ipsec->tx_tbl);
+	kfree(ipsec);
+err1:
+	netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
+}
+
+/**
+ * ixgbevf_stop_ipsec_offload - tear down the IPsec offload
+ * @adapter: board private structure
+ **/
+void ixgbevf_stop_ipsec_offload(struct ixgbevf_adapter *adapter)
+{
+	struct ixgbevf_ipsec *ipsec = adapter->ipsec;
+
+	adapter->ipsec = NULL;
+	if (ipsec) {
+		kfree(ipsec->rx_tbl);
+		kfree(ipsec->tx_tbl);
+		kfree(ipsec);
+	}
+}