Acked-by: Jeff Guo <jia....@intel.com>
> -----Original Message-----
> From: Xing, Beilei <beilei.x...@intel.com>
> Sent: Friday, November 20, 2020 4:50 PM
> To: dev@dpdk.org
> Cc: Guo, Jia <jia....@intel.com>; Xing, Beilei <beilei.x...@intel.com>;
> sta...@dpdk.org
> Subject: [PATCH v2] net/i40e: fix global register recovery
>
> From: Beilei Xing <beilei.x...@intel.com>
>
> PMD configures the global register I40E_GLINT_CTL during device
> initialization to work around the Rx write back issue. But when a device is
> bound from DPDK to kernel, the global register is not recovered to the
> original state, it will cause kernel driver performance drop issue.
> This patch fixes this issue.
>
> Fixes: be6c228d4da3 ("i40e: support Rx interrupt")
> Fixes: 4ab831449a1c ("net/i40e: fix interrupt conflict with multi-driver")
> Cc: sta...@dpdk.org
>
> Signed-off-by: Beilei Xing <beilei.x...@intel.com>
> ---
>
> v2 change:
> - refine commit log
>
> drivers/net/i40e/i40e_ethdev.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
> index f54769c29d..2cb18ecc03 100644
> --- a/drivers/net/i40e/i40e_ethdev.c
> +++ b/drivers/net/i40e/i40e_ethdev.c
> @@ -763,6 +763,21 @@ static inline void i40e_config_automask(struct
> i40e_pf *pf)
> I40E_WRITE_REG(hw, I40E_GLINT_CTL, val); }
>
> +static inline void i40e_clear_automask(struct i40e_pf *pf) {
> + struct i40e_hw *hw = I40E_PF_TO_HW(pf);
> + uint32_t val;
> +
> + val = I40E_READ_REG(hw, I40E_GLINT_CTL);
> + val &= ~(I40E_GLINT_CTL_DIS_AUTOMASK_PF0_MASK |
> + I40E_GLINT_CTL_DIS_AUTOMASK_VF0_MASK);
> +
> + if (!pf->support_multi_driver)
> + val &= ~I40E_GLINT_CTL_DIS_AUTOMASK_N_MASK;
> +
> + I40E_WRITE_REG(hw, I40E_GLINT_CTL, val); }
> +
> #define I40E_FLOW_CONTROL_ETHERTYPE 0x8808
>
> /*
> @@ -2741,6 +2756,8 @@ i40e_dev_close(struct rte_eth_dev *dev)
> /* Remove all Traffic Manager configuration */
> i40e_tm_conf_uninit(dev);
>
> + i40e_clear_automask(pf);
> +
> hw->adapter_closed = 1;
> return ret;
> }
> --
> 2.26.2
