netdev - Re: [PATCH v5 bpf-next 5/9] veth: Add ndo_xdp

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Date:   Thu, 26 Jul 2018 20:54:21 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Toshiaki Makita <toshiaki.makita1@...il.com>,
        netdev@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     Toshiaki Makita <makita.toshiaki@....ntt.co.jp>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: Re: [PATCH v5 bpf-next 5/9] veth: Add ndo_xdp_xmit

On 07/26/2018 07:40 AM, Toshiaki Makita wrote:
> From: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
> 
> This allows NIC's XDP to redirect packets to veth. The destination veth
> device enqueues redirected packets to the napi ring of its peer, then
> they are processed by XDP on its peer veth device.
> This can be thought as calling another XDP program by XDP program using
> REDIRECT, when the peer enables driver XDP.
> 
> Note that when the peer veth device does not set driver xdp, redirected
> packets will be dropped because the peer is not ready for NAPI.
> 
> v4:
> - Don't use xdp_ok_fwd_dev() because checking IFF_UP is not necessary.
>   Add comments about it and check only MTU.
> 
> v2:
> - Drop the part converting xdp_frame into skb when XDP is not enabled.
> - Implement bulk interface of ndo_xdp_xmit.
> - Implement XDP_XMIT_FLUSH bit and drop ndo_xdp_flush.
> 
> Signed-off-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
> ---
>  drivers/net/veth.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 51 insertions(+)
> 

Acked-by: John Fastabend <john.fastabend@...il.com>