netdev - Re: Query on new ethtool RSS hashing options

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Date:   Sat, 6 Mar 2021 17:38:14 +0530
From:   Sunil Kovvuri <sunil.kovvuri@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     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 6, 2021 at 4:37 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Fri, 5 Mar 2021 16:15:51 +0530 Sunil Kovvuri wrote:
> > Hi,
> >
> > We have a requirement where in we want RSS hashing to be done on packet fields
> > which are not currently supported by the ethtool.
> >
> > Current options:
> > ehtool -n <dev> rx-flow-hash
> > tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6 m|v|t|s|d|f|n|r
> >
> > Specifically our requirement is to calculate hash with DSA tag (which
> > is inserted by switch) plus the TCP/UDP 4-tuple as input.
>
> 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.

Thanks,
Sunil.

Download attachment "FDSA_tag_format.jpg" of type "image/jpeg" (151135 bytes)