netdev - Re: [net-next 1/3] i40e: Allow changing FEC settings on X722 if supported by FW

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Message-ID: <CA+FuTSc8eBgQcYTH4hzv_+BkxYLnWgogRcV-sep=kxiOrWkBFQ@mail.gmail.com>
Date:   Fri, 9 Oct 2020 13:55:19 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Tony Nguyen <anthony.l.nguyen@...el.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jaroslaw Gawin <jaroslawx.gawin@...el.com>,
        Network Development <netdev@...r.kernel.org>,
        nhorman@...hat.com, sassmann@...hat.com,
        Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
        Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
        Andrew Bowers <andrewx.bowers@...el.com>
Subject: Re: [net-next 1/3] i40e: Allow changing FEC settings on X722 if
 supported by FW

On Wed, Oct 7, 2020 at 7:11 PM Tony Nguyen <anthony.l.nguyen@...el.com> wrote:
>
> From: Jaroslaw Gawin <jaroslawx.gawin@...el.com>
>
> Starting with API version 1.10 firmware for X722 devices has ability
> to change FEC settings in PHY. Code added in this patch allows
> changing FEC settings if the capability flag indicates the device
> supports this feature.
>
> Signed-off-by: Jaroslaw Gawin <jaroslawx.gawin@...el.com>
> Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
> Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
> Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>

Acked-by: Willem de Bruijn <willemb@...gle.com>

(for netdrv)

> @@ -1484,11 +1485,18 @@ static int i40e_set_fec_param(struct net_device *netdev,
>         int err = 0;
>
>         if (hw->device_id != I40E_DEV_ID_25G_SFP28 &&
> -           hw->device_id != I40E_DEV_ID_25G_B) {
> +           hw->device_id != I40E_DEV_ID_25G_B &&
> +           hw->device_id != I40E_DEV_ID_KX_X722) {
>                 err = -EPERM;
>                 goto done;
>         }
>
> +       if (hw->mac.type == I40E_MAC_X722 &&
> +           !(hw->flags & I40E_HW_FLAG_X722_FEC_REQUEST_CAPABLE)) {
> +               netdev_err(netdev, "Setting FEC encoding not supported by firmware. Please update the NVM image.\n");
> +               return -EINVAL;
> +       }
> +

no need to respin for this, but this early return is inconsistent with
other error paths in the function. Label done is not needed at all,
could convert them all.