netdev - Re: [PATCH net-next] net: phy: phylink: add fallback from SGMII to 1000BaseX

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Message-ID: <3e14a072-07c7-d7e0-a6ef-26643b0bb21b@cogentembedded.com>
Date:   Sat, 1 Jun 2019 12:46:15 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Robert Hancock <hancock@...systems.ca>, netdev@...r.kernel.org
Cc:     linux@...linux.org.uk
Subject: Re: [PATCH net-next] net: phy: phylink: add fallback from SGMII to
 1000BaseX

Hello!

On 31.05.2019 22:18, Robert Hancock wrote:

> Some copper SFP modules support both SGMII and 1000BaseX, but some
> drivers/devices only support the 1000BaseX mode. Currently SGMII mode is
> always being selected as the desired mode for such modules, and this
> fails if the controller doesn't support SGMII. Add a fallback for this
> case by trying 1000BaseX instead if the controller rejects SGMII mode.
> 
> Signed-off-by: Robert Hancock <hancock@...systems.ca>
> ---
>   drivers/net/phy/phylink.c | 21 +++++++++++++++++++++
>   1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index 68d0a89..4fd72c2 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
[...]
> @@ -1663,6 +1665,25 @@ static int phylink_sfp_module_insert(void *upstream,
>   
>   	config.interface = iface;
>   	ret = phylink_validate(pl, support, &config);
> +
> +	if (ret && iface == PHY_INTERFACE_MODE_SGMII &&
> +	    phylink_test(orig_support, 1000baseX_Full)) {
> +		/* Copper modules may select SGMII but the interface may not
> +		 * support that mode, try 1000BaseX if supported.
> +		 */
> +
> +		netdev_warn(pl->netdev, "validation of %s/%s with support %*pb "
> +			    "failed: %d, trying 1000BaseX\n",

    Don't break the messages like this, scripts/checkpatch.pl shouldn't 
complain about too long lines in this case.

[...]

MBR, Sergei