Re: [dpdk-dev] [v4] net/i40e: fix SFP X722 not work with FW4.16

["Stillwell Jr, Paul M" <paul.m.stillwell.jr@intel.com>]

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Xiao Zhang
> Sent: Friday, July 19, 2019 4:00 AM
> To: dev@dpdk.org
> Cc: Xing, Beilei <beilei.xing@intel.com>; Wang, Haiyue
> <haiyue.wang@intel.com>; Zhang, Qi Z <qi.z.zhang@intel.com>; Zhang, Xiao
> <xiao.zhang@intel.com>; stable@dpdk.org
> Subject: [dpdk-dev] [v4] net/i40e: fix SFP X722 not work with FW4.16
> 
> The code checked the NVM API version of FW to check if support adminq
> operation, when version is 1.7 or above adminq operation is support and the
> adminq flag will be set. The code will use adminq to set TPID if the flags set or
> to use register. The NVM API version of SFP X722 old versions are lowwer
> than 1.7 and for FW4.16 is 1.8. But FW4.16 of SFP
> X722 does not support adminq operation, the legacy logic is not compatible
> with device SFP X722 currently. Check the device id to unset adminq flag to
> use resigter setting to make it work.
> 

Sorry, I'm still confused about what this patch is doing. From the commit message it seems like there are a couple of conditions:

If the device is X722
	Then if FW < 1.7 then use register to set TPID
	Else use adminq to set TPID

The change in the code is only looking to see if the device is X722 and not doing any other checking of FW version.

Am I misunderstanding the commit message, the patch, or both?

> Fixes: 73cd7d6dc8e1 ("net/i40e: use set switch AQ instead of register
> setting")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Xiao Zhang <xiao.zhang@intel.com>
> ---
> v4
> Add more detailed information in the commit log.
> v3
> Modify the commit log to make it not confused and add fixed line.
> v2
> Unset adminq flag instead of only checking device id when set TPID.
> v1
> Check device id when setting TPID, use adminq if not SFP X722, else use
> register.
> ---
>  drivers/net/i40e/i40e_ethdev.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
> index 2b9fc45..2b2c877 100644
> --- a/drivers/net/i40e/i40e_ethdev.c
> +++ b/drivers/net/i40e/i40e_ethdev.c
> @@ -1358,6 +1358,10 @@ eth_i40e_dev_init(struct rte_eth_dev *dev, void
> *init_params __rte_unused)
>  		PMD_INIT_LOG(ERR, "Failed to init adminq: %d", ret);
>  		return -EIO;
>  	}
> +	/* Firmware of SFP x722 does not support adminq option */
> +	if (hw->device_id == I40E_DEV_ID_SFP_X722)
> +		hw->flags &= ~I40E_HW_FLAG_802_1AD_CAPABLE;
> +
>  	PMD_INIT_LOG(INFO, "FW %d.%d API %d.%d NVM
> %02d.%02d.%02d eetrack %04x",
>  		     hw->aq.fw_maj_ver, hw->aq.fw_min_ver,
>  		     hw->aq.api_maj_ver, hw->aq.api_min_ver,
> --
> 2.7.4