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path: root/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
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Diffstat (limited to 'drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c')
-rw-r--r--drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c941
1 files changed, 941 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
new file mode 100644
index 000000000000..93eacddb6704
--- /dev/null
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
@@ -0,0 +1,941 @@
+/*******************************************************************************
+ *
+ * Intel 10 Gigabit PCI Express Linux driver
+ * Copyright(c) 2017 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ * Contact Information:
+ * Linux NICS <linux.nics@intel.com>
+ * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ ******************************************************************************/
+
+#include "ixgbe.h"
+#include <net/xfrm.h>
+#include <crypto/aead.h>
+
+/**
+ * ixgbe_ipsec_set_tx_sa - set the Tx SA registers
+ * @hw: hw specific details
+ * @idx: register index to write
+ * @key: key byte array
+ * @salt: salt bytes
+ **/
+static void ixgbe_ipsec_set_tx_sa(struct ixgbe_hw *hw, u16 idx,
+ u32 key[], u32 salt)
+{
+ u32 reg;
+ int i;
+
+ for (i = 0; i < 4; i++)
+ IXGBE_WRITE_REG(hw, IXGBE_IPSTXKEY(i), cpu_to_be32(key[3 - i]));
+ IXGBE_WRITE_REG(hw, IXGBE_IPSTXSALT, cpu_to_be32(salt));
+ IXGBE_WRITE_FLUSH(hw);
+
+ reg = IXGBE_READ_REG(hw, IXGBE_IPSTXIDX);
+ reg &= IXGBE_RXTXIDX_IPS_EN;
+ reg |= idx << IXGBE_RXTXIDX_IDX_SHIFT | IXGBE_RXTXIDX_WRITE;
+ IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, reg);
+ IXGBE_WRITE_FLUSH(hw);
+}
+
+/**
+ * ixgbe_ipsec_set_rx_item - set an Rx table item
+ * @hw: hw specific details
+ * @idx: register index to write
+ * @tbl: table selector
+ *
+ * Trigger the device to store into a particular Rx table the
+ * data that has already been loaded into the input register
+ **/
+static void ixgbe_ipsec_set_rx_item(struct ixgbe_hw *hw, u16 idx,
+ enum ixgbe_ipsec_tbl_sel tbl)
+{
+ u32 reg;
+
+ reg = IXGBE_READ_REG(hw, IXGBE_IPSRXIDX);
+ reg &= IXGBE_RXTXIDX_IPS_EN;
+ reg |= tbl << IXGBE_RXIDX_TBL_SHIFT |
+ idx << IXGBE_RXTXIDX_IDX_SHIFT |
+ IXGBE_RXTXIDX_WRITE;
+ IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, reg);
+ IXGBE_WRITE_FLUSH(hw);
+}
+
+/**
+ * ixgbe_ipsec_set_rx_sa - set up the register bits to save SA info
+ * @hw: hw specific details
+ * @idx: register index to write
+ * @spi: security parameter index
+ * @key: key byte array
+ * @salt: salt bytes
+ * @mode: rx decrypt control bits
+ * @ip_idx: index into IP table for related IP address
+ **/
+static void ixgbe_ipsec_set_rx_sa(struct ixgbe_hw *hw, u16 idx, __be32 spi,
+ u32 key[], u32 salt, u32 mode, u32 ip_idx)
+{
+ int i;
+
+ /* store the SPI (in bigendian) and IPidx */
+ IXGBE_WRITE_REG(hw, IXGBE_IPSRXSPI, cpu_to_le32(spi));
+ IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPIDX, ip_idx);
+ IXGBE_WRITE_FLUSH(hw);
+
+ ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_spi_tbl);
+
+ /* store the key, salt, and mode */
+ for (i = 0; i < 4; i++)
+ IXGBE_WRITE_REG(hw, IXGBE_IPSRXKEY(i), cpu_to_be32(key[3 - i]));
+ IXGBE_WRITE_REG(hw, IXGBE_IPSRXSALT, cpu_to_be32(salt));
+ IXGBE_WRITE_REG(hw, IXGBE_IPSRXMOD, mode);
+ IXGBE_WRITE_FLUSH(hw);
+
+ ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_key_tbl);
+}
+
+/**
+ * ixgbe_ipsec_set_rx_ip - set up the register bits to save SA IP addr info
+ * @hw: hw specific details
+ * @idx: register index to write
+ * @addr: IP address byte array
+ **/
+static void ixgbe_ipsec_set_rx_ip(struct ixgbe_hw *hw, u16 idx, __be32 addr[])
+{
+ int i;
+
+ /* store the ip address */
+ for (i = 0; i < 4; i++)
+ IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPADDR(i), cpu_to_le32(addr[i]));
+ IXGBE_WRITE_FLUSH(hw);
+
+ ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_ip_tbl);
+}
+
+/**
+ * ixgbe_ipsec_clear_hw_tables - because some tables don't get cleared on reset
+ * @adapter: board private structure
+ **/
+static void ixgbe_ipsec_clear_hw_tables(struct ixgbe_adapter *adapter)
+{
+ struct ixgbe_ipsec *ipsec = adapter->ipsec;
+ struct ixgbe_hw *hw = &adapter->hw;
+ u32 buf[4] = {0, 0, 0, 0};
+ u16 idx;
+
+ /* disable Rx and Tx SA lookup */
+ IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
+ IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
+
+ /* scrub the tables - split the loops for the max of the IP table */
+ for (idx = 0; idx < IXGBE_IPSEC_MAX_RX_IP_COUNT; idx++) {
+ ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
+ ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
+ ixgbe_ipsec_set_rx_ip(hw, idx, (__be32 *)buf);
+ }
+ for (; idx < IXGBE_IPSEC_MAX_SA_COUNT; idx++) {
+ ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
+ ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
+ }
+
+ ipsec->num_rx_sa = 0;
+ ipsec->num_tx_sa = 0;
+}
+
+/**
+ * ixgbe_ipsec_stop_data
+ * @adapter: board private structure
+ **/
+static void ixgbe_ipsec_stop_data(struct ixgbe_adapter *adapter)
+{
+ struct ixgbe_hw *hw = &adapter->hw;
+ bool link = adapter->link_up;
+ u32 t_rdy, r_rdy;
+ u32 limit;
+ u32 reg;
+
+ /* halt data paths */
+ reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
+ reg |= IXGBE_SECTXCTRL_TX_DIS;
+ IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
+
+ reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
+ reg |= IXGBE_SECRXCTRL_RX_DIS;
+ IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
+
+ IXGBE_WRITE_FLUSH(hw);
+
+ /* If the tx fifo doesn't have link, but still has data,
+ * we can't clear the tx sec block. Set the MAC loopback
+ * before block clear
+ */
+ if (!link) {
+ reg = IXGBE_READ_REG(hw, IXGBE_MACC);
+ reg |= IXGBE_MACC_FLU;
+ IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
+
+ reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
+ reg |= IXGBE_HLREG0_LPBK;
+ IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
+
+ IXGBE_WRITE_FLUSH(hw);
+ mdelay(3);
+ }
+
+ /* wait for the paths to empty */
+ limit = 20;
+ do {
+ mdelay(10);
+ t_rdy = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
+ IXGBE_SECTXSTAT_SECTX_RDY;
+ r_rdy = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
+ IXGBE_SECRXSTAT_SECRX_RDY;
+ } while (!t_rdy && !r_rdy && limit--);
+
+ /* undo loopback if we played with it earlier */
+ if (!link) {
+ reg = IXGBE_READ_REG(hw, IXGBE_MACC);
+ reg &= ~IXGBE_MACC_FLU;
+ IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
+
+ reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
+ reg &= ~IXGBE_HLREG0_LPBK;
+ IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
+
+ IXGBE_WRITE_FLUSH(hw);
+ }
+}
+
+/**
+ * ixgbe_ipsec_stop_engine
+ * @adapter: board private structure
+ **/
+static void ixgbe_ipsec_stop_engine(struct ixgbe_adapter *adapter)
+{
+ struct ixgbe_hw *hw = &adapter->hw;
+ u32 reg;
+
+ ixgbe_ipsec_stop_data(adapter);
+
+ /* disable Rx and Tx SA lookup */
+ IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
+ IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
+
+ /* disable the Rx and Tx engines and full packet store-n-forward */
+ reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
+ reg |= IXGBE_SECTXCTRL_SECTX_DIS;
+ reg &= ~IXGBE_SECTXCTRL_STORE_FORWARD;
+ IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
+
+ reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
+ reg |= IXGBE_SECRXCTRL_SECRX_DIS;
+ IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
+
+ /* restore the "tx security buffer almost full threshold" to 0x250 */
+ IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, 0x250);
+
+ /* Set minimum IFG between packets back to the default 0x1 */
+ reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
+ reg = (reg & 0xfffffff0) | 0x1;
+ IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
+
+ /* final set for normal (no ipsec offload) processing */
+ IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_SECTX_DIS);
+ IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, IXGBE_SECRXCTRL_SECRX_DIS);
+
+ IXGBE_WRITE_FLUSH(hw);
+}
+
+/**
+ * ixgbe_ipsec_start_engine
+ * @adapter: board private structure
+ *
+ * NOTE: this increases power consumption whether being used or not
+ **/
+static void ixgbe_ipsec_start_engine(struct ixgbe_adapter *adapter)
+{
+ struct ixgbe_hw *hw = &adapter->hw;
+ u32 reg;
+
+ ixgbe_ipsec_stop_data(adapter);
+
+ /* Set minimum IFG between packets to 3 */
+ reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
+ reg = (reg & 0xfffffff0) | 0x3;
+ IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
+
+ /* Set "tx security buffer almost full threshold" to 0x15 so that the
+ * almost full indication is generated only after buffer contains at
+ * least an entire jumbo packet.
+ */
+ reg = IXGBE_READ_REG(hw, IXGBE_SECTXBUFFAF);
+ reg = (reg & 0xfffffc00) | 0x15;
+ IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, reg);
+
+ /* restart the data paths by clearing the DISABLE bits */
+ IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, 0);
+ IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_STORE_FORWARD);
+
+ /* enable Rx and Tx SA lookup */
+ IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, IXGBE_RXTXIDX_IPS_EN);
+ IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, IXGBE_RXTXIDX_IPS_EN);
+
+ IXGBE_WRITE_FLUSH(hw);
+}
+
+/**
+ * ixgbe_ipsec_restore - restore the ipsec HW settings after a reset
+ * @adapter: board private structure
+ **/
+void ixgbe_ipsec_restore(struct ixgbe_adapter *adapter)
+{
+ struct ixgbe_ipsec *ipsec = adapter->ipsec;
+ struct ixgbe_hw *hw = &adapter->hw;
+ int i;
+
+ if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED))
+ return;
+
+ /* clean up and restart the engine */
+ ixgbe_ipsec_stop_engine(adapter);
+ ixgbe_ipsec_clear_hw_tables(adapter);
+ ixgbe_ipsec_start_engine(adapter);
+
+ /* reload the IP addrs */
+ for (i = 0; i < IXGBE_IPSEC_MAX_RX_IP_COUNT; i++) {
+ struct rx_ip_sa *ipsa = &ipsec->ip_tbl[i];
+
+ if (ipsa->used)
+ ixgbe_ipsec_set_rx_ip(hw, i, ipsa->ipaddr);
+ }
+
+ /* reload the Rx and Tx keys */
+ for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
+ struct rx_sa *rsa = &ipsec->rx_tbl[i];
+ struct tx_sa *tsa = &ipsec->tx_tbl[i];
+
+ if (rsa->used)
+ ixgbe_ipsec_set_rx_sa(hw, i, rsa->xs->id.spi,
+ rsa->key, rsa->salt,
+ rsa->mode, rsa->iptbl_ind);
+
+ if (tsa->used)
+ ixgbe_ipsec_set_tx_sa(hw, i, tsa->key, tsa->salt);
+ }
+}
+
+/**
+ * ixgbe_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 ixgbe_ipsec_find_empty_idx(struct ixgbe_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;
+}
+
+/**
+ * ixgbe_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 *ixgbe_ipsec_find_rx_state(struct ixgbe_ipsec *ipsec,
+ __be32 *daddr, u8 proto,
+ __be32 spi, bool ip4)
+{
+ struct rx_sa *rsa;
+ struct xfrm_state *ret = NULL;
+
+ rcu_read_lock();
+ hash_for_each_possible_rcu(ipsec->rx_sa_list, rsa, hlist, 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;
+}
+
+/**
+ * ixgbe_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 ixgbe_ipsec_parse_proto_keys(struct xfrm_state *xs,
+ u32 *mykey, u32 *mysalt)
+{
+ struct net_device *dev = xs->xso.dev;
+ unsigned char *key_data;
+ char *alg_name = NULL;
+ const char aes_gcm_name[] = "rfc4106(gcm(aes))";
+ int key_len;
+
+ if (xs->aead) {
+ key_data = &xs->aead->alg_key[0];
+ key_len = xs->aead->alg_key_len;
+ alg_name = xs->aead->alg_name;
+ } else {
+ netdev_err(dev, "Unsupported IPsec algorithm\n");
+ return -EINVAL;
+ }
+
+ 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 bigendian array of bytes, so
+ * we don't need to do any byteswapping.
+ * 160 accounts for 16 byte key and 4 byte salt
+ */
+ if (key_len == 160) {
+ *mysalt = ((u32 *)key_data)[4];
+ } else if (key_len != 128) {
+ netdev_err(dev, "IPsec hw offload only supports keys up to 128 bits with a 32 bit salt\n");
+ return -EINVAL;
+ } else {
+ netdev_info(dev, "IPsec hw offload parameters missing 32 bit salt value\n");
+ *mysalt = 0;
+ }
+ memcpy(mykey, key_data, 16);
+
+ return 0;
+}
+
+/**
+ * ixgbe_ipsec_add_sa - program device with a security association
+ * @xs: pointer to transformer state struct
+ **/
+static int ixgbe_ipsec_add_sa(struct xfrm_state *xs)
+{
+ struct net_device *dev = xs->xso.dev;
+ struct ixgbe_adapter *adapter = netdev_priv(dev);
+ struct ixgbe_ipsec *ipsec = adapter->ipsec;
+ struct ixgbe_hw *hw = &adapter->hw;
+ int checked, match, first;
+ u16 sa_idx;
+ int ret;
+ int i;
+
+ 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->xso.flags & XFRM_OFFLOAD_INBOUND) {
+ struct rx_sa rsa;
+
+ if (xs->calg) {
+ netdev_err(dev, "Compression offload not supported\n");
+ return -EINVAL;
+ }
+
+ /* find the first unused index */
+ ret = ixgbe_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 = ixgbe_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);
+
+ /* The HW does not have a 1:1 mapping from keys to IP addrs, so
+ * check for a matching IP addr entry in the table. If the addr
+ * already exists, use it; else find an unused slot and add the
+ * addr. If one does not exist and there are no unused table
+ * entries, fail the request.
+ */
+
+ /* Find an existing match or first not used, and stop looking
+ * after we've checked all we know we have.
+ */
+ checked = 0;
+ match = -1;
+ first = -1;
+ for (i = 0;
+ i < IXGBE_IPSEC_MAX_RX_IP_COUNT &&
+ (checked < ipsec->num_rx_sa || first < 0);
+ i++) {
+ if (ipsec->ip_tbl[i].used) {
+ if (!memcmp(ipsec->ip_tbl[i].ipaddr,
+ rsa.ipaddr, sizeof(rsa.ipaddr))) {
+ match = i;
+ break;
+ }
+ checked++;
+ } else if (first < 0) {
+ first = i; /* track the first empty seen */
+ }
+ }
+
+ if (ipsec->num_rx_sa == 0)
+ first = 0;
+
+ if (match >= 0) {
+ /* addrs are the same, we should use this one */
+ rsa.iptbl_ind = match;
+ ipsec->ip_tbl[match].ref_cnt++;
+
+ } else if (first >= 0) {
+ /* no matches, but here's an empty slot */
+ rsa.iptbl_ind = first;
+
+ memcpy(ipsec->ip_tbl[first].ipaddr,
+ rsa.ipaddr, sizeof(rsa.ipaddr));
+ ipsec->ip_tbl[first].ref_cnt = 1;
+ ipsec->ip_tbl[first].used = true;
+
+ ixgbe_ipsec_set_rx_ip(hw, rsa.iptbl_ind, rsa.ipaddr);
+
+ } else {
+ /* no match and no empty slot */
+ netdev_err(dev, "No space for SA in Rx IP SA table\n");
+ memset(&rsa, 0, sizeof(rsa));
+ return -ENOSPC;
+ }
+
+ 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;
+
+ /* the preparations worked, so save the info */
+ memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
+
+ ixgbe_ipsec_set_rx_sa(hw, sa_idx, rsa.xs->id.spi, rsa.key,
+ rsa.salt, rsa.mode, rsa.iptbl_ind);
+ 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,
+ rsa.xs->id.spi);
+ } else {
+ struct tx_sa tsa;
+
+ /* find the first unused index */
+ ret = ixgbe_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 = ixgbe_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;
+ }
+
+ /* the preparations worked, so save the info */
+ memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
+
+ ixgbe_ipsec_set_tx_sa(hw, sa_idx, tsa.key, tsa.salt);
+
+ xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
+
+ ipsec->num_tx_sa++;
+ }
+
+ /* enable the engine if not already warmed up */
+ if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED)) {
+ ixgbe_ipsec_start_engine(adapter);
+ adapter->flags2 |= IXGBE_FLAG2_IPSEC_ENABLED;
+ }
+
+ return 0;
+}
+
+/**
+ * ixgbe_ipsec_del_sa - clear out this specific SA
+ * @xs: pointer to transformer state struct
+ **/
+static void ixgbe_ipsec_del_sa(struct xfrm_state *xs)
+{
+ struct net_device *dev = xs->xso.dev;
+ struct ixgbe_adapter *adapter = netdev_priv(dev);
+ struct ixgbe_ipsec *ipsec = adapter->ipsec;
+ struct ixgbe_hw *hw = &adapter->hw;
+ u32 zerobuf[4] = {0, 0, 0, 0};
+ u16 sa_idx;
+
+ if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
+ struct rx_sa *rsa;
+ u8 ipi;
+
+ sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
+ rsa = &ipsec->rx_tbl[sa_idx];
+
+ if (!rsa->used) {
+ netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
+ sa_idx, xs->xso.offload_handle);
+ return;
+ }
+
+ ixgbe_ipsec_set_rx_sa(hw, sa_idx, 0, zerobuf, 0, 0, 0);
+ hash_del_rcu(&rsa->hlist);
+
+ /* if the IP table entry is referenced by only this SA,
+ * i.e. ref_cnt is only 1, clear the IP table entry as well
+ */
+ ipi = rsa->iptbl_ind;
+ if (ipsec->ip_tbl[ipi].ref_cnt > 0) {
+ ipsec->ip_tbl[ipi].ref_cnt--;
+
+ if (!ipsec->ip_tbl[ipi].ref_cnt) {
+ memset(&ipsec->ip_tbl[ipi], 0,
+ sizeof(struct rx_ip_sa));
+ ixgbe_ipsec_set_rx_ip(hw, ipi, zerobuf);
+ }
+ }
+
+ memset(rsa, 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;
+ }
+
+ ixgbe_ipsec_set_tx_sa(hw, sa_idx, zerobuf, 0);
+ memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
+ ipsec->num_tx_sa--;
+ }
+
+ /* if there are no SAs left, stop the engine to save energy */
+ if (ipsec->num_rx_sa == 0 && ipsec->num_tx_sa == 0) {
+ adapter->flags2 &= ~IXGBE_FLAG2_IPSEC_ENABLED;
+ ixgbe_ipsec_stop_engine(adapter);
+ }
+}
+
+/**
+ * ixgbe_ipsec_offload_ok - can this packet use the xfrm hw offload
+ * @skb: current data packet
+ * @xs: pointer to transformer state struct
+ **/
+static bool ixgbe_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;
+}
+
+/**
+ * ixgbe_ipsec_free - called by xfrm garbage collections
+ * @xs: pointer to transformer state struct
+ *
+ * We don't have any garbage to collect, so we shouldn't bother
+ * implementing this function, but the XFRM code doesn't check for
+ * existence before calling the API callback.
+ **/
+static void ixgbe_ipsec_free(struct xfrm_state *xs)
+{
+}
+
+static const struct xfrmdev_ops ixgbe_xfrmdev_ops = {
+ .xdo_dev_state_add = ixgbe_ipsec_add_sa,
+ .xdo_dev_state_delete = ixgbe_ipsec_del_sa,
+ .xdo_dev_offload_ok = ixgbe_ipsec_offload_ok,
+ .xdo_dev_state_free = ixgbe_ipsec_free,
+};
+
+/**
+ * ixgbe_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 ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
+ struct ixgbe_tx_buffer *first,
+ struct ixgbe_ipsec_tx_data *itd)
+{
+ struct ixgbe_adapter *adapter = netdev_priv(tx_ring->netdev);
+ struct ixgbe_ipsec *ipsec = adapter->ipsec;
+ struct xfrm_state *xs;
+ struct tx_sa *tsa;
+
+ if (unlikely(!first->skb->sp->len)) {
+ netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
+ __func__, first->skb->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;
+ }
+
+ itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
+ if (unlikely(itd->sa_idx > IXGBE_IPSEC_MAX_SA_COUNT)) {
+ netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
+ __func__, itd->sa_idx, xs->xso.offload_handle);
+ return 0;
+ }
+
+ tsa = &ipsec->tx_tbl[itd->sa_idx];
+ if (unlikely(!tsa->used)) {
+ netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
+ __func__, itd->sa_idx);
+ return 0;
+ }
+
+ first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CC;
+
+ itd->flags = 0;
+ 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;
+ itd->trailer_len = xs->props.trailer_len;
+ }
+ if (tsa->encrypt)
+ itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
+
+ return 1;
+}
+
+/**
+ * ixgbe_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 ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
+ union ixgbe_adv_rx_desc *rx_desc,
+ struct sk_buff *skb)
+{
+ struct ixgbe_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 ixgbe_ipsec *ipsec = adapter->ipsec;
+ struct xfrm_offload *xo = NULL;
+ struct xfrm_state *xs = NULL;
+ struct ipv6hdr *ip6 = NULL;
+ struct iphdr *ip4 = NULL;
+ 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 = ixgbe_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
+ if (unlikely(!xs))
+ return;
+
+ skb->sp = secpath_dup(skb->sp);
+ if (unlikely(!skb->sp))
+ return;
+
+ skb->sp->xvec[skb->sp->len++] = xs;
+ skb->sp->olen++;
+ xo = xfrm_offload(skb);
+ xo->flags = CRYPTO_DONE;
+ xo->status = CRYPTO_SUCCESS;
+
+ adapter->rx_ipsec++;
+}
+
+/**
+ * ixgbe_init_ipsec_offload - initialize security registers for IPSec operation
+ * @adapter: board private structure
+ **/
+void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter)
+{
+ struct ixgbe_ipsec *ipsec;
+ size_t size;
+
+ if (adapter->hw.mac.type == ixgbe_mac_82598EB)
+ 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;
+
+ size = sizeof(struct rx_ip_sa) * IXGBE_IPSEC_MAX_RX_IP_COUNT;
+ ipsec->ip_tbl = kzalloc(size, GFP_KERNEL);
+ if (!ipsec->ip_tbl)
+ goto err2;
+
+ ipsec->num_rx_sa = 0;
+ ipsec->num_tx_sa = 0;
+
+ adapter->ipsec = ipsec;
+ ixgbe_ipsec_stop_engine(adapter);
+ ixgbe_ipsec_clear_hw_tables(adapter);
+
+ adapter->netdev->xfrmdev_ops = &ixgbe_xfrmdev_ops;
+ adapter->netdev->features |= NETIF_F_HW_ESP;
+ adapter->netdev->hw_enc_features |= NETIF_F_HW_ESP;
+
+ return;
+
+err2:
+ kfree(ipsec->ip_tbl);
+ kfree(ipsec->rx_tbl);
+ kfree(ipsec->tx_tbl);
+err1:
+ kfree(adapter->ipsec);
+ netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
+}
+
+/**
+ * ixgbe_stop_ipsec_offload - tear down the ipsec offload
+ * @adapter: board private structure
+ **/
+void ixgbe_stop_ipsec_offload(struct ixgbe_adapter *adapter)
+{
+ struct ixgbe_ipsec *ipsec = adapter->ipsec;
+
+ adapter->ipsec = NULL;
+ if (ipsec) {
+ kfree(ipsec->ip_tbl);
+ kfree(ipsec->rx_tbl);
+ kfree(ipsec->tx_tbl);
+ kfree(ipsec);
+ }
+}