netdev - Re: Query on new ethtool RSS hashing options

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Date:   Mon, 8 Mar 2021 18:50:38 +0530
From:   Sunil Kovvuri <sunil.kovvuri@...il.com>
To:     Tobias Waldekranz <tobias@...dekranz.com>
Cc:     Vladimir Oltean <olteanv@...il.com>,
        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 Sun, Mar 7, 2021 at 2:46 AM Tobias Waldekranz <tobias@...dekranz.com> wrote:
>
> On Sat, Mar 06, 2021 at 14:54, Vladimir Oltean <olteanv@...il.com> wrote:
> > 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?
>
> That is indeed the format parsed by tag_dsa.c. Based on the layout in
> the image, I am pretty sure that it is from the functional spec. of the
> Amethyst (6393X). So while the format is supported, that specific device
> is not. Hopefully that will change soon:
>
> https://lore.kernel.org/netdev/cover.1610071984.git.pavana.sharma@digi.com/

Thanks for the info.

>
> As for the NIC: Marvell has an EVK for the Amethyst, connected to a
> CN9130 SoC. The ethernet controllers in those can parse DSA tags in
> hardware, so I would put my money on that.
>
> The upstream driver (mvpp2) does not seem to support it though, AFAIK.

This is not for the mvpp2 driver, but for RVU driver
drivers/net/ethernet/marvell/octeontx2.

Thanks,
Sunil.