netdev - Re: [PATCH net-next 29/33] xdp: allow bpf_xdp_adjust

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Message-ID: <87wo652cxm.fsf@toke.dk>
Date:   Fri, 24 Apr 2020 16:09:09 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>, sameehj@...zon.com
Cc:     Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, zorik@...zon.com, akiyano@...zon.com,
        gtzalik@...zon.com, Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        John Fastabend <john.fastabend@...il.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        David Ahern <dsahern@...il.com>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Saeed Mahameed <saeedm@...lanox.com>,
        steffen.klassert@...unet.com
Subject: Re: [PATCH net-next 29/33] xdp: allow bpf_xdp_adjust_tail() to grow packet size

Jesper Dangaard Brouer <brouer@...hat.com> writes:

> Finally, after all drivers have a frame size, allow BPF-helper
> bpf_xdp_adjust_tail() to grow or extend packet size at frame tail.
>
> Remember that helper/macro xdp_data_hard_end have reserved some
> tailroom.  Thus, this helper makes sure that the BPF-prog don't have
> access to this tailroom area.
>
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>

Acked-by: Toke Høiland-Jørgensen <toke@...hat.com>