netdev - Re: [PATCH v2 net] amd-xgbe: fix the false linkup in xgbe_phy

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Date: Thu, 25 May 2023 09:41:23 -0500
From: Tom Lendacky <thomas.lendacky@....com>
To: Raju Rangoju <Raju.Rangoju@....com>, netdev@...r.kernel.org
Cc: Sudheesh Mavila <sudheesh.mavila@....com>,
 Simon Horman <simon.horman@...igine.com>,
 Shyam Sundar S K <Shyam-sundar.S-k@....com>
Subject: Re: [PATCH v2 net] amd-xgbe: fix the false linkup in xgbe_phy_status

On 5/25/23 05:17, Raju Rangoju wrote:
> In the event of a change in XGBE mode, the current auto-negotiation
> needs to be reset and the AN cycle needs to be re-triggerred. However,
> the current code ignores the return value of xgbe_set_mode(), leading to
> false information as the link is declared without checking the status
> register.
> 
> Fix this by propagating the mode switch status information to
> xgbe_phy_status().
> 
> Fixes: e57f7a3feaef ("amd-xgbe: Prepare for working with more than one type of phy")
> Co-developed-by: Sudheesh Mavila <sudheesh.mavila@....com>
> Signed-off-by: Sudheesh Mavila <sudheesh.mavila@....com>
> Reviewed-by: Simon Horman <simon.horman@...igine.com>
> Acked-by: Shyam Sundar S K <Shyam-sundar.S-k@....com>
> Signed-off-by: Raju Rangoju <Raju.Rangoju@....com>
> ---
> Changes since v1:
> - Fixed the warning "1 blamed authors not CCed"
> - Fixed spelling mistake
> 
>   drivers/net/ethernet/amd/xgbe/xgbe-mdio.c | 14 ++++++++++----
>   1 file changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c b/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
> index 33a9574e9e04..9822648747b7 100644
> --- a/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
> +++ b/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
> @@ -1329,7 +1329,7 @@ static enum xgbe_mode xgbe_phy_status_aneg(struct xgbe_prv_data *pdata)
>   	return pdata->phy_if.phy_impl.an_outcome(pdata);
>   }
>   
> -static void xgbe_phy_status_result(struct xgbe_prv_data *pdata)
> +static bool xgbe_phy_status_result(struct xgbe_prv_data *pdata)
>   {
>   	struct ethtool_link_ksettings *lks = &pdata->phy.lks;
>   	enum xgbe_mode mode;
> @@ -1367,8 +1367,13 @@ static void xgbe_phy_status_result(struct xgbe_prv_data *pdata)
>   
>   	pdata->phy.duplex = DUPLEX_FULL;
>   
> -	if (xgbe_set_mode(pdata, mode) && pdata->an_again)
> -		xgbe_phy_reconfig_aneg(pdata);
> +	if (xgbe_set_mode(pdata, mode)) {
> +		if (pdata->an_again)
> +			xgbe_phy_reconfig_aneg(pdata);
> +		return true;
> +	}
> +
> +	return false;

Just a nit (and only my opinion) for better code readability, but you can 
save some indentation and make this a bit cleaner by doing:

	if (!xgbe_set_mode(pdata, mode))
		return false;

	if (pdata->an_again)
		xgbe_phy_reconfig_aneg(pdata);

	return true;

Thanks,
Tom

>   }
>   
>   static void xgbe_phy_status(struct xgbe_prv_data *pdata)
> @@ -1398,7 +1403,8 @@ static void xgbe_phy_status(struct xgbe_prv_data *pdata)
>   			return;
>   		}
>   
> -		xgbe_phy_status_result(pdata);
> +		if (xgbe_phy_status_result(pdata))
> +			return;
>   
>   		if (test_bit(XGBE_LINK_INIT, &pdata->dev_state))
>   			clear_bit(XGBE_LINK_INIT, &pdata->dev_state);