From: Eyal Birger <eyal.birger@xxxxxxxxx>
Date: Sun, 1 Mar 2015 14:58:24 +0200
> Commit 977750076d98 ("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 to userspace.
>
> It was considered to alias skb->priority instead of skb->mark.
> However, that would lead to the inabilty to export skb->priority
> to userspace if desired. Such change may also lead to hard-to-find
> issues as skb->priority is assumed to be alias free, and, as noted
> by Shmulik Ladkani, is not 'naturally orthogonal' with other skb
> fields.
>
> This patch series follows the suggestions made by Eric Dumazet moving
> the dropcount metric to skb->cb[], eliminating this problem
> at the expense of 4 bytes less in skb->cb[] for protocol families
> using it.
>
> The patch series include compactization of bluetooth and packet
> use of skb->cb[] as well as the infrastructure for placing dropcount
> in skb->cb[].
Ok, I think I can live with this.
Series applied, thanks.
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