net: move skb->dropcount to skb->cb[]
Commit 97775007 ("af_packet: add interframe drop cmsg (v6)") unionized skb->mark and skb->dropcount in order to allow recording of the socket drop count while maintaining struct sk_buff size. skb->dropcount was introduced since there was no available room in skb->cb[] in packet sockets. However, its introduction led to the inability to export skb->mark, or any other aliased field to userspace if so desired. Moving the dropcount metric to skb->cb[] eliminates this problem at the expense of 4 bytes less in skb->cb[] for protocol families using it. Signed-off-by:Eyal Birger <eyal.birger@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
parent
3bc3b96f
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