netdev - Re: [PATCH net-next 02/11] tuntap: switch to use XDP_PACKET

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Date:   Thu, 6 Sep 2018 12:57:39 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH net-next 02/11] tuntap: switch to use XDP_PACKET_HEADROOM

On Thu, Sep 06, 2018 at 12:05:17PM +0800, Jason Wang wrote:
> Signed-off-by: Jason Wang <jasowang@...hat.com>

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

any idea why didn't we do this straight away?

> ---
>  drivers/net/tun.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 2c548bd20393..d3677a544b56 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -113,7 +113,6 @@ do {								\
>  } while (0)
>  #endif
>  
> -#define TUN_HEADROOM 256
>  #define TUN_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD)
>  
>  /* TUN device flags */
> @@ -1654,7 +1653,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
>  	rcu_read_lock();
>  	xdp_prog = rcu_dereference(tun->xdp_prog);
>  	if (xdp_prog)
> -		pad += TUN_HEADROOM;
> +		pad += XDP_PACKET_HEADROOM;
>  	buflen += SKB_DATA_ALIGN(len + pad);
>  	rcu_read_unlock();
>  
> -- 
> 2.17.1