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

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Message-ID: <20161208165515.GA92599@ast-mbp.thefacebook.com>
Date:   Thu, 8 Dec 2016 08:55:17 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Martin KaFai Lau <kafai@...com>, netdev@...r.kernel.org,
        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 Thu, Dec 08, 2016 at 10:02:37AM +0100, Daniel Borkmann wrote:
> 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>

Acked-by: Alexei Starovoitov <ast@...nel.org>