netdev - Re: Query on new ethtool RSS hashing options

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Message-ID: <20210306125427.tzt42itdwukz2cto@skbuf>
Date:   Sat, 6 Mar 2021 14:54:27 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Sunil Kovvuri <sunil.kovvuri@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Linux Netdev List <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        George Cherian <gcherian@...vell.com>,
        Subbaraya Sundeep <sbhatta@...vell.com>,
        Sunil Goutham <sgoutham@...vell.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: Query on new ethtool RSS hashing options

On Sat, Mar 06, 2021 at 05:38:14PM +0530, Sunil Kovvuri wrote:
> > Can you share the format of the DSA tag? Is there a driver for it
> > upstream? Do we need to represent it in union ethtool_flow_union?
> >
> 
> No, there is no driver for this tag in the kernel.
> I have attached the tag format.
> There are multiple DSA tag formats and representing them ethtool_flow
> union would be difficult.
> Hence wondering if it would be okay to add a more flexible way ie
> offset and num_bytes from the start of packet.

How sure are you that the tag format you've shared is not identical to
the one parsed by net/dsa/tag_dsa.c?