netdev - Re: [PATCH net-next 19/33] tun: add XDP frame size

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Date:   Wed, 6 May 2020 16:30:51 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     sameehj@...zon.com, Jason Wang <jasowang@...hat.com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org, zorik@...zon.com,
        akiyano@...zon.com, gtzalik@...zon.com,
        Toke Høiland-Jørgensen <toke@...hat.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 19/33] tun: add XDP frame size

On Wed, Apr 22, 2020 at 06:08:57PM +0200, Jesper Dangaard Brouer wrote:
> The tun driver have two code paths for running XDP (bpf_prog_run_xdp).
> In both cases 'buflen' contains enough tailroom for skb_shared_info.
> 
> Cc: Jason Wang <jasowang@...hat.com>
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>

Acked-by: Michael S. Tsirkin <mst@...hat.com>

> ---
>  drivers/net/tun.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 44889eba1dbc..c54f967e2c66 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -1671,6 +1671,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
>  		xdp_set_data_meta_invalid(&xdp);
>  		xdp.data_end = xdp.data + len;
>  		xdp.rxq = &tfile->xdp_rxq;
> +		xdp.frame_sz = buflen;
>  
>  		act = bpf_prog_run_xdp(xdp_prog, &xdp);
>  		if (act == XDP_REDIRECT || act == XDP_TX) {
> @@ -2411,6 +2412,7 @@ static int tun_xdp_one(struct tun_struct *tun,
>  		}
>  		xdp_set_data_meta_invalid(xdp);
>  		xdp->rxq = &tfile->xdp_rxq;
> +		xdp->frame_sz = buflen;
>  
>  		act = bpf_prog_run_xdp(xdp_prog, xdp);
>  		err = tun_xdp_act(tun, xdp_prog, xdp, act);
> 
>