netdev - Re: [PATCH v2 net-next 0/4]: Allow head adjustment in XDP prog

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Message-ID: <20161205175302.0d5d4fa7@jkicinski-Precision-T1700>
Date:   Mon, 5 Dec 2016 17:53:02 +0000
From:   Jakub Kicinski <kubakici@...pl>
To:     Martin KaFai Lau <kafai@...com>
Cc:     <netdev@...r.kernel.org>, Alexei Starovoitov <ast@...com>,
        Brenden Blanco <bblanco@...mgrid.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v2 net-next 0/4]: Allow head adjustment in XDP prog

On Sat, 3 Dec 2016 19:17:22 -0800, Martin KaFai Lau wrote:
> This series adds a helper to allow head adjusting in XDP prog.  mlx4
> driver has been modified to support this feature.  An example is written
> to encapsulate a packet with an IPv4/v6 header and then XDP_TX it
> out.

Can we just add a feature to one of four drivers which support XDP
today and AFAICT leave it completely broken on remaining tree?

I'm not seeing any way for the drivers to inform the stack about their
capabilities, would that not be a pre-requisite?