netdev - Re: [PATCH net v2 1/2] net: ethtool: fix ioctl confusing drivers about desired HDS user config

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Message-ID: <Z7ikttkCnaW_rajB@mini-arch>
Date: Fri, 21 Feb 2025 08:07:18 -0800
From: Stanislav Fomichev <stfomichev@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
	pabeni@...hat.com, andrew+netdev@...n.ch, horms@...nel.org,
	dxu@...uu.xyz, michael.chan@...adcom.com, ap420073@...il.com
Subject: Re: [PATCH net v2 1/2] net: ethtool: fix ioctl confusing drivers
 about desired HDS user config

On 02/20, Jakub Kicinski wrote:
> The legacy ioctl path does not have support for extended attributes.
> So we issue a GET to fetch the current settings from the driver,
> in an attempt to keep them unchanged. HDS is a bit "special" as
> the GET only returns on/off while the SET takes a "ternary" argument
> (on/off/default). If the driver was in the "default" setting -
> executing the ioctl path binds it to on or off, even tho the user
> did not intend to change HDS config.
> 
> Factor the relevant logic out of the netlink code and reuse it.
> 
> Fixes: 87c8f8496a05 ("bnxt_en: add support for tcp-data-split ethtool command")
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>

Acked-by: Stanislav Fomichev <sdf@...ichev.me>