mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 14:37:48 +07:00
85bc2663a5
With all the support code in place we can now link in the ipsec offload operations and set the ESP feature flag for the XFRM subsystem to see. Signed-off-by: Shannon Nelson <shannon.nelson@oracle.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
942 lines
25 KiB
C
942 lines
25 KiB
C
/*******************************************************************************
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*
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* Intel 10 Gigabit PCI Express Linux driver
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* Copyright(c) 2017 Oracle and/or its affiliates. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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* Contact Information:
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* Linux NICS <linux.nics@intel.com>
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* e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*
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******************************************************************************/
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#include "ixgbe.h"
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#include <net/xfrm.h>
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#include <crypto/aead.h>
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/**
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* ixgbe_ipsec_set_tx_sa - set the Tx SA registers
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* @hw: hw specific details
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* @idx: register index to write
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* @key: key byte array
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* @salt: salt bytes
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**/
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static void ixgbe_ipsec_set_tx_sa(struct ixgbe_hw *hw, u16 idx,
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u32 key[], u32 salt)
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{
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u32 reg;
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int i;
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for (i = 0; i < 4; i++)
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IXGBE_WRITE_REG(hw, IXGBE_IPSTXKEY(i), cpu_to_be32(key[3 - i]));
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IXGBE_WRITE_REG(hw, IXGBE_IPSTXSALT, cpu_to_be32(salt));
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IXGBE_WRITE_FLUSH(hw);
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reg = IXGBE_READ_REG(hw, IXGBE_IPSTXIDX);
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reg &= IXGBE_RXTXIDX_IPS_EN;
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reg |= idx << IXGBE_RXTXIDX_IDX_SHIFT | IXGBE_RXTXIDX_WRITE;
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IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, reg);
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IXGBE_WRITE_FLUSH(hw);
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}
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/**
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* ixgbe_ipsec_set_rx_item - set an Rx table item
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* @hw: hw specific details
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* @idx: register index to write
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* @tbl: table selector
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*
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* Trigger the device to store into a particular Rx table the
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* data that has already been loaded into the input register
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**/
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static void ixgbe_ipsec_set_rx_item(struct ixgbe_hw *hw, u16 idx,
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enum ixgbe_ipsec_tbl_sel tbl)
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{
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u32 reg;
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reg = IXGBE_READ_REG(hw, IXGBE_IPSRXIDX);
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reg &= IXGBE_RXTXIDX_IPS_EN;
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reg |= tbl << IXGBE_RXIDX_TBL_SHIFT |
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idx << IXGBE_RXTXIDX_IDX_SHIFT |
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IXGBE_RXTXIDX_WRITE;
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IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, reg);
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IXGBE_WRITE_FLUSH(hw);
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}
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/**
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* ixgbe_ipsec_set_rx_sa - set up the register bits to save SA info
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* @hw: hw specific details
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* @idx: register index to write
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* @spi: security parameter index
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* @key: key byte array
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* @salt: salt bytes
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* @mode: rx decrypt control bits
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* @ip_idx: index into IP table for related IP address
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**/
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static void ixgbe_ipsec_set_rx_sa(struct ixgbe_hw *hw, u16 idx, __be32 spi,
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u32 key[], u32 salt, u32 mode, u32 ip_idx)
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{
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int i;
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/* store the SPI (in bigendian) and IPidx */
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IXGBE_WRITE_REG(hw, IXGBE_IPSRXSPI, cpu_to_le32(spi));
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IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPIDX, ip_idx);
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IXGBE_WRITE_FLUSH(hw);
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ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_spi_tbl);
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/* store the key, salt, and mode */
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for (i = 0; i < 4; i++)
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IXGBE_WRITE_REG(hw, IXGBE_IPSRXKEY(i), cpu_to_be32(key[3 - i]));
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IXGBE_WRITE_REG(hw, IXGBE_IPSRXSALT, cpu_to_be32(salt));
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IXGBE_WRITE_REG(hw, IXGBE_IPSRXMOD, mode);
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IXGBE_WRITE_FLUSH(hw);
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ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_key_tbl);
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}
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/**
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* ixgbe_ipsec_set_rx_ip - set up the register bits to save SA IP addr info
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* @hw: hw specific details
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* @idx: register index to write
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* @addr: IP address byte array
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**/
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static void ixgbe_ipsec_set_rx_ip(struct ixgbe_hw *hw, u16 idx, __be32 addr[])
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{
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int i;
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/* store the ip address */
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for (i = 0; i < 4; i++)
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IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPADDR(i), cpu_to_le32(addr[i]));
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IXGBE_WRITE_FLUSH(hw);
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ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_ip_tbl);
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}
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/**
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* ixgbe_ipsec_clear_hw_tables - because some tables don't get cleared on reset
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* @adapter: board private structure
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**/
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static void ixgbe_ipsec_clear_hw_tables(struct ixgbe_adapter *adapter)
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{
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struct ixgbe_ipsec *ipsec = adapter->ipsec;
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struct ixgbe_hw *hw = &adapter->hw;
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u32 buf[4] = {0, 0, 0, 0};
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u16 idx;
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/* disable Rx and Tx SA lookup */
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IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
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IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
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/* scrub the tables - split the loops for the max of the IP table */
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for (idx = 0; idx < IXGBE_IPSEC_MAX_RX_IP_COUNT; idx++) {
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ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
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ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
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ixgbe_ipsec_set_rx_ip(hw, idx, (__be32 *)buf);
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}
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for (; idx < IXGBE_IPSEC_MAX_SA_COUNT; idx++) {
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ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
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ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
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}
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ipsec->num_rx_sa = 0;
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ipsec->num_tx_sa = 0;
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}
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/**
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* ixgbe_ipsec_stop_data
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* @adapter: board private structure
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**/
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static void ixgbe_ipsec_stop_data(struct ixgbe_adapter *adapter)
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{
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struct ixgbe_hw *hw = &adapter->hw;
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bool link = adapter->link_up;
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u32 t_rdy, r_rdy;
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u32 limit;
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u32 reg;
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/* halt data paths */
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reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
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reg |= IXGBE_SECTXCTRL_TX_DIS;
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IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
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reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
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reg |= IXGBE_SECRXCTRL_RX_DIS;
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IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
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IXGBE_WRITE_FLUSH(hw);
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/* If the tx fifo doesn't have link, but still has data,
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* we can't clear the tx sec block. Set the MAC loopback
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* before block clear
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*/
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if (!link) {
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reg = IXGBE_READ_REG(hw, IXGBE_MACC);
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reg |= IXGBE_MACC_FLU;
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IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
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reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
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reg |= IXGBE_HLREG0_LPBK;
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IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
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IXGBE_WRITE_FLUSH(hw);
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mdelay(3);
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}
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/* wait for the paths to empty */
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limit = 20;
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do {
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mdelay(10);
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t_rdy = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
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IXGBE_SECTXSTAT_SECTX_RDY;
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r_rdy = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
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IXGBE_SECRXSTAT_SECRX_RDY;
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} while (!t_rdy && !r_rdy && limit--);
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/* undo loopback if we played with it earlier */
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if (!link) {
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reg = IXGBE_READ_REG(hw, IXGBE_MACC);
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reg &= ~IXGBE_MACC_FLU;
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IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
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reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
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reg &= ~IXGBE_HLREG0_LPBK;
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IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
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IXGBE_WRITE_FLUSH(hw);
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}
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}
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/**
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* ixgbe_ipsec_stop_engine
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* @adapter: board private structure
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**/
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static void ixgbe_ipsec_stop_engine(struct ixgbe_adapter *adapter)
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{
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struct ixgbe_hw *hw = &adapter->hw;
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u32 reg;
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ixgbe_ipsec_stop_data(adapter);
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/* disable Rx and Tx SA lookup */
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IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
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IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
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/* disable the Rx and Tx engines and full packet store-n-forward */
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reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
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reg |= IXGBE_SECTXCTRL_SECTX_DIS;
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reg &= ~IXGBE_SECTXCTRL_STORE_FORWARD;
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IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
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reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
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reg |= IXGBE_SECRXCTRL_SECRX_DIS;
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IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
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/* restore the "tx security buffer almost full threshold" to 0x250 */
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IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, 0x250);
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/* Set minimum IFG between packets back to the default 0x1 */
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reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
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reg = (reg & 0xfffffff0) | 0x1;
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IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
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/* final set for normal (no ipsec offload) processing */
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IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_SECTX_DIS);
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IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, IXGBE_SECRXCTRL_SECRX_DIS);
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IXGBE_WRITE_FLUSH(hw);
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}
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/**
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* ixgbe_ipsec_start_engine
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* @adapter: board private structure
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*
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* NOTE: this increases power consumption whether being used or not
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**/
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static void ixgbe_ipsec_start_engine(struct ixgbe_adapter *adapter)
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{
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struct ixgbe_hw *hw = &adapter->hw;
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u32 reg;
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ixgbe_ipsec_stop_data(adapter);
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/* Set minimum IFG between packets to 3 */
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reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
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reg = (reg & 0xfffffff0) | 0x3;
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IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
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/* Set "tx security buffer almost full threshold" to 0x15 so that the
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* almost full indication is generated only after buffer contains at
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* least an entire jumbo packet.
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*/
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reg = IXGBE_READ_REG(hw, IXGBE_SECTXBUFFAF);
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reg = (reg & 0xfffffc00) | 0x15;
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IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, reg);
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/* restart the data paths by clearing the DISABLE bits */
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IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, 0);
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IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_STORE_FORWARD);
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/* enable Rx and Tx SA lookup */
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IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, IXGBE_RXTXIDX_IPS_EN);
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IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, IXGBE_RXTXIDX_IPS_EN);
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IXGBE_WRITE_FLUSH(hw);
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}
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/**
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* ixgbe_ipsec_restore - restore the ipsec HW settings after a reset
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* @adapter: board private structure
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**/
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void ixgbe_ipsec_restore(struct ixgbe_adapter *adapter)
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{
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struct ixgbe_ipsec *ipsec = adapter->ipsec;
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struct ixgbe_hw *hw = &adapter->hw;
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int i;
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if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED))
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return;
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/* clean up and restart the engine */
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ixgbe_ipsec_stop_engine(adapter);
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ixgbe_ipsec_clear_hw_tables(adapter);
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ixgbe_ipsec_start_engine(adapter);
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/* reload the IP addrs */
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for (i = 0; i < IXGBE_IPSEC_MAX_RX_IP_COUNT; i++) {
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struct rx_ip_sa *ipsa = &ipsec->ip_tbl[i];
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if (ipsa->used)
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ixgbe_ipsec_set_rx_ip(hw, i, ipsa->ipaddr);
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}
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/* reload the Rx and Tx keys */
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for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
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struct rx_sa *rsa = &ipsec->rx_tbl[i];
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struct tx_sa *tsa = &ipsec->tx_tbl[i];
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if (rsa->used)
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ixgbe_ipsec_set_rx_sa(hw, i, rsa->xs->id.spi,
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rsa->key, rsa->salt,
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rsa->mode, rsa->iptbl_ind);
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if (tsa->used)
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ixgbe_ipsec_set_tx_sa(hw, i, tsa->key, tsa->salt);
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}
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}
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/**
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* ixgbe_ipsec_find_empty_idx - find the first unused security parameter index
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* @ipsec: pointer to ipsec struct
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* @rxtable: true if we need to look in the Rx table
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*
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* Returns the first unused index in either the Rx or Tx SA table
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**/
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static int ixgbe_ipsec_find_empty_idx(struct ixgbe_ipsec *ipsec, bool rxtable)
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{
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u32 i;
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if (rxtable) {
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if (ipsec->num_rx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
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return -ENOSPC;
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/* search rx sa table */
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for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
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if (!ipsec->rx_tbl[i].used)
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return i;
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}
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} else {
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if (ipsec->num_tx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
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return -ENOSPC;
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/* search tx sa table */
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for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
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if (!ipsec->tx_tbl[i].used)
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return i;
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}
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}
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return -ENOSPC;
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}
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/**
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* ixgbe_ipsec_find_rx_state - find the state that matches
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* @ipsec: pointer to ipsec struct
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* @daddr: inbound address to match
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* @proto: protocol to match
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* @spi: SPI to match
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* @ip4: true if using an ipv4 address
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*
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* Returns a pointer to the matching SA state information
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**/
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static struct xfrm_state *ixgbe_ipsec_find_rx_state(struct ixgbe_ipsec *ipsec,
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__be32 *daddr, u8 proto,
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__be32 spi, bool ip4)
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{
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struct rx_sa *rsa;
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struct xfrm_state *ret = NULL;
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rcu_read_lock();
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hash_for_each_possible_rcu(ipsec->rx_sa_list, rsa, hlist, spi)
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if (spi == rsa->xs->id.spi &&
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((ip4 && *daddr == rsa->xs->id.daddr.a4) ||
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(!ip4 && !memcmp(daddr, &rsa->xs->id.daddr.a6,
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sizeof(rsa->xs->id.daddr.a6)))) &&
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proto == rsa->xs->id.proto) {
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ret = rsa->xs;
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xfrm_state_hold(ret);
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break;
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}
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rcu_read_unlock();
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return ret;
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}
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/**
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* ixgbe_ipsec_parse_proto_keys - find the key and salt based on the protocol
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* @xs: pointer to xfrm_state struct
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* @mykey: pointer to key array to populate
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* @mysalt: pointer to salt value to populate
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*
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* This copies the protocol keys and salt to our own data tables. The
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* 82599 family only supports the one algorithm.
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**/
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static int ixgbe_ipsec_parse_proto_keys(struct xfrm_state *xs,
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u32 *mykey, u32 *mysalt)
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{
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struct net_device *dev = xs->xso.dev;
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unsigned char *key_data;
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char *alg_name = NULL;
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const char aes_gcm_name[] = "rfc4106(gcm(aes))";
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int key_len;
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if (xs->aead) {
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key_data = &xs->aead->alg_key[0];
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key_len = xs->aead->alg_key_len;
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alg_name = xs->aead->alg_name;
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} else {
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netdev_err(dev, "Unsupported IPsec algorithm\n");
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return -EINVAL;
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}
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if (strcmp(alg_name, aes_gcm_name)) {
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netdev_err(dev, "Unsupported IPsec algorithm - please use %s\n",
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aes_gcm_name);
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return -EINVAL;
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}
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/* The key bytes come down in a bigendian array of bytes, so
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* we don't need to do any byteswapping.
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* 160 accounts for 16 byte key and 4 byte salt
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*/
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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);
|
|
}
|
|
}
|