netdev - Re: [PATCH] net: Fix missing meta data in skb with vlan packet

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Date:   Mon, 15 Apr 2019 17:28:40 +0900
From:   Yuya Kusakabe <yuya.kusakabe@...il.com>
To:     Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Cc:     davem@...emloft.net, taketarou2@...il.com, netdev@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>
Subject: Re: [PATCH] net: Fix missing meta data in skb with vlan packet

On Mon, Apr 15, 2019 at 5:08 PM Toshiaki Makita
<makita.toshiaki@....ntt.co.jp> wrote:
>
> On 2019/04/15 16:43, Yuya Kusakabe wrote:
> ...
> >     > @@ -5095,6 +5096,13 @@ static struct sk_buff
> >     > *skb_reorder_vlan_header(struct sk_buff *skb)
> >     >                 memmove(skb_mac_header(skb) + VLAN_HLEN,
> >     skb_mac_header(skb),
> >     >                         mac_len - VLAN_HLEN - ETH_TLEN);
> >     >         }
> >     > +
> >     > +       meta_len = skb_metadata_len(skb);
> >     > +       if (meta_len) {
> >
> >     Since this is not used by non-XDP skb and skb path is slow-path for XDP
> >     anyway, should add unlikely here in favor of non-XDP case?
> >
> >
> > I referred to meta data support of the ixgbe driver. It doesn't use
> > "unlikely".
> > https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/tree/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c#n2176
>
> No need to conform to existing logic when we can improve it...

I understand.

> Anyway this is a minor point and I'm OK with either.
>
> Reviewed-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
>
> --
> Toshiaki Makita
>

Thank you!

-- 
Yuya Kusakabe