From: Eric Dumazet <edumazet@google.com>
Date: Thu, 5 Dec 2013 12:45:08 +0000 (-0800)
Subject: net: introduce dev_consume_skb_any()
X-Git-Tag: v3.14-rc1~94^2~585
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e6247027e5173c00efb2084d688d06ff835bc3b0;p=pandora-kernel.git

net: introduce dev_consume_skb_any()

Some network drivers use dev_kfree_skb_any() and dev_kfree_skb_irq()
helpers to free skbs, both for dropped packets and TX completed ones.

We need to separate the two causes to get better diagnostics
given by dropwatch or "perf record -e skb:kfree_skb"

This patch provides two new helpers, dev_consume_skb_any() and
dev_consume_skb_irq() to be used for consumed skbs.

__dev_kfree_skb_irq() is slightly optimized to remove one
atomic_dec_and_test() in fast path, and use this_cpu_{r|w} accessors.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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