Re: [dpdk-dev] [PATCH] net/i40e: fix X710 Rx issue after reading some registers

["Zhang, Qi Z" <qi.z.zhang@intel.com>]

> -----Original Message-----
> From: Xing, Beilei
> Sent: Tuesday, November 13, 2018 8:11 PM
> To: Zhang, Qi Z <qi.z.zhang@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>
> Cc: dev@dpdk.org; stable@dpdk.org
> Subject: [PATCH] net/i40e: fix X710 Rx issue after reading some registers
> 
> There's an issue that X710 can't receive any packet after reading some special
> registers. That's because these registers are only valid for X722, read access for
> non-X722 will cause ECC error.
> 
> Fixes: d9efd0136ac1 ("i40e: add EEPROM and registers dumping")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Beilei Xing <beilei.xing@intel.com>
> ---
>  drivers/net/i40e/i40e_ethdev.c | 33
> +++++++++++++++++++++++++++++++--
>  1 file changed, 31 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
> index 1c77906..686227e 100644
> --- a/drivers/net/i40e/i40e_ethdev.c
> +++ b/drivers/net/i40e/i40e_ethdev.c
> @@ -11609,6 +11609,31 @@ i40e_dev_rx_queue_intr_disable(struct
> rte_eth_dev *dev, uint16_t queue_id)
>  	return 0;
>  }
> 
> +/**
> + * This function is used to check if the register is valid for non-X722 NIC.
> + * Below is the valid registers list for X722 only:
> + * 0x2b800--0x2bb00
> + * 0x38700--0x38a00
> + * 0x3d800--0x3db00
> + * 0x208e00--0x209000
> + * 0x20be00--0x20c000
> + * 0x263c00--0x264000
> + * 0x265c00--0x266000
> + */
> +static inline int i40e_valid_regs(uint32_t reg_offset) {

The function is named as "i4Oe_xxx", but actually it is for all devices.
I think it will be better either move the mac_type check into the function or rename to a more specific function name.


> +	if (((reg_offset >= 0x2b800) && (reg_offset <= 0x2bb00)) ||
> +	    ((reg_offset >= 0x38700) && (reg_offset <= 0x38a00)) ||
> +	    ((reg_offset >= 0x3d800) && (reg_offset <= 0x3db00)) ||
> +	    ((reg_offset >= 0x208e00) && (reg_offset <= 0x209000)) ||
> +	    ((reg_offset >= 0x20be00) && (reg_offset <= 0x20c000)) ||
> +	    ((reg_offset >= 0x263c00) && (reg_offset <= 0x264000)) ||
> +	    ((reg_offset >= 0x265c00) && (reg_offset <= 0x266000)))
> +		return 0;
> +	else
> +		return 1;
> +}
> +
>  static int i40e_get_regs(struct rte_eth_dev *dev,
>  			 struct rte_dev_reg_info *regs)
>  {
> @@ -11650,8 +11675,12 @@ static int i40e_get_regs(struct rte_eth_dev
> *dev,
>  				reg_offset = arr_idx * reg_info->stride1 +
>  					arr_idx2 * reg_info->stride2;
>  				reg_offset += reg_info->base_addr;
> -				ptr_data[reg_offset >> 2] =
> -					I40E_READ_REG(hw, reg_offset);
> +				if ((hw->mac.type != I40E_MAC_X722) &&
> +				    !i40e_valid_regs(reg_offset))
> +					ptr_data[reg_offset >> 2] = 0;
> +				else
> +					ptr_data[reg_offset >> 2] =
> +						I40E_READ_REG(hw, reg_offset);
>  			}
>  	}
> 
> --
> 2.5.5