netdev - Re: [PATCH net-next] tg3: copy only needed fields from userspace-provided EEE data

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Message-ID: <14978af2-0b94-4677-b303-da7c690abcca@lunn.ch>
Date: Sun, 18 Feb 2024 18:04:07 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Heiner Kallweit <hkallweit1@...il.com>
Cc: Pavan Chebbi <pavan.chebbi@...adcom.com>,
	Michael Chan <mchan@...adcom.com>, Jakub Kicinski <kuba@...nel.org>,
	David Miller <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Russell King - ARM Linux <linux@...linux.org.uk>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] tg3: copy only needed fields from
 userspace-provided EEE data

On Sun, Feb 18, 2024 at 03:49:55PM +0100, Heiner Kallweit wrote:
> The current code overwrites fields in tp->eee with unchecked data from
> edata, e.g. the bitmap with supported modes. ethtool properly returns
> the received data from get_eee() call, but we have no guarantee that
> other users of the ioctl set_eee() interface behave properly too.
> Therefore copy only fields which are actually needed.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>

This one needed some time for me to understand. I missed that when
programming the PHY to advertise, it is hard coded what it actually
advertises. So there is no need to copy the advertise linkmode from
edata.

I suspect this driver is broken in that it does not wait for the
result of the auto-neg to enable/disable EEE in the hardware. But it
could be hiding somewhere in the code and i also missed that.

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew