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

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Date:   Mon, 15 Nov 2021 16:44:38 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Sean Anderson <sean.anderson@...o.com>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        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 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>

I've added it to my tree as I have patches that follow on which
entirely eliminate macb_validate(), replacing it with the generic
implementation that was merged into net-next today.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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