netdev - Re: [PATCH iproute2 net-next] bpf: add support for generic xdp

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Date:   Fri, 28 Apr 2017 15:38:42 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     stephen@...workplumber.org
CC:     alexei.starovoitov@...il.com, davem@...emloft.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 net-next] bpf: add support for generic xdp

On 04/28/2017 12:42 PM, Daniel Borkmann wrote:
> Follow-up to commit c7272ca72009 ("bpf: add initial support for
> attaching xdp progs") to also support generic XDP. This adds an
> indicator for loaded generic XDP programs when programs are loaded
> as shown in c7272ca72009, but the driver still lacks native XDP
> support.
>
>    # ip link
>    [...]
>    3: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 xdpgeneric qdisc [...]
>        link/ether 0c:c4:7a:03:f9:25 brd ff:ff:ff:ff:ff:ff
>    [...]
>
> In case the driver does support native XDP, but the user wants
> to load the program as generic XDP (e.g. for testing purposes),
> then this can be done with the same semantics as in c7272ca72009,
> but with 'xdpgeneric' instead of 'xdp' command for loading:
>
>    # ip -force link set dev eno1 xdpgeneric obj xdp.o
>
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> ---
>   ( Requires a header update to pull in XDP_FLAGS_SKB_MODE. )

Scratch that, will send a v2 shortly.