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ixgbe: add ipsec engine start and stop routines 

Add in the code for running and stopping the hardware ipsec
encryption/decryption engine.  It is good to keep the engine
off when not in use in order to save on the power draw.

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>
This commit is contained in:
Shannon Nelson 2017-12-19 15:59:55 -08:00 committed by Jeff Kirsher
parent 8bbbc5e90b
commit 49a94d74d9
1 changed files with 142 additions and 0 deletions
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142
drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
View File

@ -151,6 +151,147 @@ static void ixgbe_ipsec_clear_hw_tables(struct ixgbe_adapter *adapter)
}
}
/**
* 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_init_ipsec_offload - initialize security registers for IPSec operation
* @adapter: board private structure
@ -158,4 +299,5 @@ static void ixgbe_ipsec_clear_hw_tables(struct ixgbe_adapter *adapter)
void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter)
{
ixgbe_ipsec_clear_hw_tables(adapter);
ixgbe_ipsec_stop_engine(adapter);
}