vlan: Introduce helper functions to check if skb is tagged
Separate the two checks for single vlan and multiple vlans in netif_skb_features(). This allows us to move the check for multiple vlans to another function later. Signed-off-by: NToshiaki Makita <makita.toshiaki@lab.ntt.co.jp> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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