netdev - RE: [RFC PATCH net-next v2] ethtool: Improve compatibility between netlink and ioctl interfaces

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Date:   Sun, 4 Oct 2020 12:46:31 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Ido Schimmel' <idosch@...sch.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "mkubecek@...e.cz" <mkubecek@...e.cz>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "saeedm@...dia.com" <saeedm@...dia.com>,
        "ayal@...dia.com" <ayal@...dia.com>,
        "mlxsw@...dia.com" <mlxsw@...dia.com>,
        Ido Schimmel <idosch@...dia.com>
Subject: RE: [RFC PATCH net-next v2] ethtool: Improve compatibility between
 netlink and ioctl interfaces

From: Ido Schimmel
> Sent: 04 October 2020 11:17
> 
> With the ioctl interface, when autoneg is enabled, but without
> specifying speed, duplex or link modes, the advertised link modes are
> set to the supported link modes by the ethtool user space utility.
...
> Fix this incompatibility problem by introducing a new flag in the
> ethtool netlink request header: 'ETHTOOL_FLAG_LEGACY'. The purpose of
> the flag is to indicate to the kernel that it needs to be compatible
> with the legacy ioctl interface. A patch to the ethtool user space
> utility will make sure the flag is always set.

You need to do that the other way around.
You can't assume the kernel and application are updated
at the same time.

	David

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