On Thu, Sep 06, 2018 at 12:05:20PM +0800, Jason Wang wrote:
> If we're sure not to go native XDP, there's no need for several things
> like bh and rcu stuffs.
>
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
True...
> ---
> drivers/net/tun.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index f8cdcfa392c3..389aa0727cc6 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -1675,10 +1675,12 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
> * of xdp_prog above, this should be rare and for simplicity
> * we do XDP on skb in case the headroom is not enough.
> */
> - if (hdr->gso_type || !xdp_prog)
> + if (hdr->gso_type || !xdp_prog) {
> *skb_xdp = 1;
> - else
> - *skb_xdp = 0;
> + goto build;
> + }
> +
> + *skb_xdp = 0;
>
> local_bh_disable();
> rcu_read_lock();
> @@ -1724,6 +1726,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
> rcu_read_unlock();
> local_bh_enable();
>
> +build:
But this is spaghetti code. Please just put common
code into functions and call them, don't goto.
> skb = build_skb(buf, buflen);
> if (!skb) {
> skb = ERR_PTR(-ENOMEM);
> --
> 2.17.1
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