From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jakub Kicinski <kubakici@wp.pl>
Subject: Re: [PATCH v2 net-next 0/4]: Allow head adjustment in XDP prog
Date: Mon, 5 Dec 2016 17:53:02 +0000
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Cc: <netdev@vger.kernel.org>, Alexei Starovoitov <ast@fb.com>,
        Brenden Blanco <bblanco@plumgrid.com>,
        Daniel Borkmann <daniel@iogearbox.net>,
        David Miller <davem@davemloft.net>,
        Jesper Dangaard Brouer <brouer@redhat.com>,
        Saeed Mahameed <saeedm@mellanox.com>,
        Tariq Toukan <tariqt@mellanox.com>,
        Kernel Team <kernel-team@fb.com>
To: Martin KaFai Lau <kafai@fb.com>
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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?