linux-kernel - Re: [PATCH net-next 07/11] tuntap: move XDP flushing out of tun_do

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Message-ID: <20180906132209-mutt-send-email-mst@kernel.org>
Date:   Thu, 6 Sep 2018 13:48:09 -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 07/11] tuntap: move XDP flushing out of
 tun_do_xdp()

On Thu, Sep 06, 2018 at 12:05:22PM +0800, Jason Wang wrote:
> This will allow adding batch flushing on top.
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
>  drivers/net/tun.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 21b125020b3b..ff1cbf3ebd50 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -1646,7 +1646,6 @@ static u32 tun_do_xdp(struct tun_struct *tun,
>  	switch (act) {
>  	case XDP_REDIRECT:
>  		*err = xdp_do_redirect(tun->dev, xdp, xdp_prog);
> -		xdp_do_flush_map();
>  		if (*err)
>  			break;
>  		goto out;
> @@ -1735,6 +1734,9 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
>  		act = tun_do_xdp(tun, tfile, xdp_prog, &xdp, &err);
>  		if (err)
>  			goto err_xdp;
> +
> +		if (act == XDP_REDIRECT)
> +			xdp_do_flush_map();
>  		if (act != XDP_PASS)
>  			goto out;

At this point the switch statement which used to contain all XDP things
seems to be gone completely. Just rewrite with a bunch of if statements
and all xdp handling spread out to where it makes sense?

> -- 
> 2.17.1