netdev - Re: [PATCH v4 net-next 1/4] bpf: xdp: Allow head adjustment in XDP prog

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Date:   Thu, 08 Dec 2016 10:02:37 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Martin KaFai Lau <kafai@...com>, netdev@...r.kernel.org
CC:     Alexei Starovoitov <ast@...com>,
        Brenden Blanco <bblanco@...mgrid.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kubakici@...pl>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v4 net-next 1/4] bpf: xdp: Allow head adjustment in XDP
 prog

On 12/08/2016 12:53 AM, Martin KaFai Lau wrote:
> This patch allows XDP prog to extend/remove the packet
> data at the head (like adding or removing header).  It is
> done by adding a new XDP helper bpf_xdp_adjust_head().
>
> It also renames bpf_helper_changes_skb_data() to
> bpf_helper_changes_pkt_data() to better reflect
> that XDP prog does not work on skb.
>
> This patch adds one "xdp_adjust_head" bit to bpf_prog for the
> XDP-capable driver to check if the XDP prog requires
> bpf_xdp_adjust_head() support.  The driver can then decide
> to error out during XDP_SETUP_PROG.
>
> Signed-off-by: Martin KaFai Lau <kafai@...com>

Acked-by: Daniel Borkmann <daniel@...earbox.net>