> +static struct sk_buff *ar9331_tag_rcv(struct sk_buff *skb,
> +                                   struct net_device *ndev,
> +                                   struct packet_type *pt)
> +{
> +     u8 ver, port;
> +     u16 hdr;
> +
> +     if (unlikely(!pskb_may_pull(skb, AR9331_HDR_LEN)))
> +             return NULL;
> +
> +     hdr = le16_to_cpu(*(__le16 *)skb_mac_header(skb));
> +
> +     ver = FIELD_GET(AR9331_HDR_VERSION_MASK, hdr);
> +     if (unlikely(ver != AR9331_HDR_VERSION)) {
> +             netdev_warn_once(ndev, "%s:%i wrong header version 0x%2x\n",
> +                              __func__, __LINE__, hdr);
> +             return NULL;
> +     }
> +
> +     if (unlikely(hdr & AR9331_HDR_FROM_CPU)) {
> +             netdev_warn_once(ndev, "%s:%i packet should not be from cpu 
> 0x%2x\n",
> +                              __func__, __LINE__, hdr);
> +             return NULL;
> +     }
> +
> +     skb_pull(skb, AR9331_HDR_LEN);
> +     skb_set_mac_header(skb, -ETH_HLEN);

No other tag driver calls skb_set_mac_header().  Also, the -ETH_HLEN
looks odd, give you have just pulled off AR9331_HDR_LEN?

What other tag drivers use is skb_pull_rcsum().

     Andrew

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