netdev - Re: [net-next PATCH v6] net: macb: Fix several edge cases in validate

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Message-ID: <20211115173523.3c2c7ecc@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 15 Nov 2021 17:35:23 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        Sean Anderson <sean.anderson@...o.com>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Parshuram Thombare <pthombar@...ence.com>,
        Antoine Tenart <atenart@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Milind Parab <mparab@...ence.com>
Subject: Re: [net-next PATCH v6] net: macb: Fix several edge cases in
 validate

On Mon, 15 Nov 2021 16:44:38 +0000 Russell King (Oracle) wrote:
> On Fri, Nov 12, 2021 at 02:04:00PM -0500, Sean Anderson wrote:
> > There were several cases where validate() would return bogus supported
> > modes with unusual combinations of interfaces and capabilities. For
> > example, if state->interface was 10GBASER and the macb had HIGH_SPEED
> > and PCS but not GIGABIT MODE, then 10/100 modes would be set anyway. In
> > another case, SGMII could be enabled even if the mac was not a GEM
> > (despite this being checked for later on in mac_config()). These
> > inconsistencies make it difficult to refactor this function cleanly.
> > 
> > There is still the open question of what exactly the requirements for
> > SGMII and 10GBASER are, and what SGMII actually supports. If someone
> > from Cadence (or anyone else with access to the GEM/MACB datasheet)
> > could comment on this, it would be greatly appreciated. In particular,
> > what is supported by Cadence vs. vendor extension/limitation?
> > 
> > To address this, the current logic is split into three parts. First, we
> > determine what we support, then we eliminate unsupported interfaces, and
> > finally we set the appropriate link modes. There is still some cruft
> > related to NA, but this can be removed in a future patch.
> > 
> > Signed-off-by: Sean Anderson <sean.anderson@...o.com>  
> 
> Thanks - this looks good to me.
> 
> Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

Applied to net-next, thanks!