Hi,
(CC: XDP maintainers)
On 2019/04/13 21:16, Yuya Kusakabe wrote:
> skb_reorder_vlan_header() should move XDP meta data with ethernet
> header if XDP meta data exists.
>
> Signed-off-by: Yuya Kusakabe <[email protected]>
> Signed-off-by: Takeru Hayasaka <[email protected]>
> Co-developed-by: Takeru Hayasaka <[email protected]>
Missing fixes tag
Fixes: de8f3a83b0a0 ("bpf: add meta pointer for direct access")
> ---
> net/core/skbuff.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index ef2cd5712098..6bc663249c4c 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -5083,7 +5083,8 @@ EXPORT_SYMBOL_GPL(skb_gso_validate_mac_len);
>
> static struct sk_buff *skb_reorder_vlan_header(struct sk_buff *skb)
> {
> - int mac_len;
> + int mac_len, meta_len;
> + void *meta;
>
> if (skb_cow(skb, skb_headroom(skb)) < 0) {
> kfree_skb(skb);
> @@ -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?
> + meta = skb_metadata_end(skb) - meta_len;
> + memmove(meta + VLAN_HLEN, meta, meta_len);
> + };
> +
> skb->mac_header += VLAN_HLEN;
> return skb;
> }
> --
> 2.20.1
>
>
--
Toshiaki Makita
