netdev - Re: Query on new ethtool RSS hashing options

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Message-ID: <CA+sq2CfmwwXONTbcz_C+YMGBRNzbwaq2XGrzje_e=3YuJikeQw@mail.gmail.com>
Date:   Mon, 8 Mar 2021 18:56:43 +0530
From:   Sunil Kovvuri <sunil.kovvuri@...il.com>
To:     Linux Netdev List <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     George Cherian <gcherian@...vell.com>,
        Subbaraya Sundeep <sbhatta@...vell.com>,
        Sunil Goutham <sgoutham@...vell.com>
Subject: Re: Query on new ethtool RSS hashing options

On Fri, Mar 5, 2021 at 4:15 PM Sunil Kovvuri <sunil.kovvuri@...il.com> 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.
>
> Is it okay to add such options to the ethtool ?
> or will it be better to add a generic option to take pkt data offset
> and number of bytes ?
>
> Something like
> ethtool -n <dev> rx-flow-hash tcp4 sdfn off <offset in the pkt> num
> <number of bytes/bits>
>
> Any comments, please.
>
> Thanks,
> Sunil.

Apologies for wasting your time.
This hashing support is not needed anymore.

Thanks,
Sunil.