linux-kernel - Re: [PATCH net-next] net: sfp: add quirk for FS SFP-10GM-T copper SFP+ module

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Message-ID: <20250226162649.641bba5d@kmaincent-XPS-13-7390>
Date: Wed, 26 Feb 2025 16:26:49 +0100
From: Kory Maincent <kory.maincent@...tlin.com>
To: Martin Schiller <ms@....tdt.de>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>, andrew@...n.ch,
 hkallweit1@...il.com, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: sfp: add quirk for FS SFP-10GM-T copper
 SFP+ module

On Wed, 26 Feb 2025 15:50:46 +0100
Martin Schiller <ms@....tdt.de> wrote:

> On 2025-02-26 15:38, Russell King (Oracle) wrote:
> > On Wed, Feb 26, 2025 at 03:10:02PM +0100, Martin Schiller wrote:  
> >> Add quirk for a copper SFP that identifies itself as "FS" 
> >> "SFP-10GM-T".
> >> It uses RollBall protocol to talk to the PHY and needs 4 sec wait 
> >> before
> >> probing the PHY.
> >> 
> >> Signed-off-by: Martin Schiller <ms@....tdt.de>
> >> ---
> >>  drivers/net/phy/sfp.c | 5 +++--
> >>  1 file changed, 3 insertions(+), 2 deletions(-)
> >> 
> >> diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
> >> index 9369f5297769..15284be4c38c 100644
> >> --- a/drivers/net/phy/sfp.c
> >> +++ b/drivers/net/phy/sfp.c
> >> @@ -479,9 +479,10 @@ static const struct sfp_quirk sfp_quirks[] = {
> >>  	// PHY.
> >>  	SFP_QUIRK_F("FS", "SFP-10G-T", sfp_fixup_fs_10gt),
> >> 
> >> -	// Fiberstore SFP-2.5G-T uses Rollball protocol to talk to the
> >> PHY and
> >> -	// needs 4 sec wait before probing the PHY.
> >> +	// Fiberstore SFP-2.5G-T and SFP-10GM-T uses Rollball protocol to 
> >> talk
> >> +	// to the PHY and needs 4 sec wait before probing the PHY.
> >>  	SFP_QUIRK_F("FS", "SFP-2.5G-T", sfp_fixup_fs_2_5gt),
> >> +	SFP_QUIRK_F("FS", "SFP-10GM-T", sfp_fixup_fs_2_5gt),  
> > 
> > Which makes sfp_fixup_fs_2_5gt mis-named. Please rename.  
> 
> OK, I'll rename it to sfp_fixup_rollball_wait.

I would prefer sfp_fixup_fs_rollball_wait to keep the name of the manufacturer.
It can't be a generic fixup as other FSP could have other waiting time values
like the Turris RTSFP-10G which needs 25s.

-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com