linux-kernel - Re: [PATCH net-next v5 4/4] phy: aquantia: Determine rate adaptation support from registers

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Message-ID: <20230105181152.ruzdv3iusvan4mek@skbuf>
Date:   Thu, 5 Jan 2023 20:11:52 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Sean Anderson <sean.anderson@...o.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Tim Harvey <tharvey@...eworks.com>
Subject: Re: [PATCH net-next v5 4/4] phy: aquantia: Determine rate adaptation
 support from registers

On Thu, Jan 05, 2023 at 01:03:49PM -0500, Sean Anderson wrote:
> IMO if we really want to support this, the easier way would be to teach
> the phy driver how to change the rate adaptation mode. That way we could
> always advertise rate adaptation, but if someone came along and
> requested 10HD we could reconfigure the phy to support it. However, this
> was deemed too risky in the discussion for v1, since we don't really
> know how the firmware interacts with the registers.

I think I would prefer not exporting anything rate adaptation related to
user space, at least until things clean up a little and we're confident
that we don't need to radically change how it works.