Merge branch 'bpf_avoid_clone'

Alexei Starovoitov says:

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bpf: performance improvements

v1->v2: dropped redundant iff_up check in patch 2

At plumbers we discussed different options on how to get rid of skb_clone
from bpf_clone_redirect(), the patch 2 implements the best option.
Patch 1 adds 'integrated exts' to cls_bpf to improve performance by
combining simple actions into bpf classifier.
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Signed-off-by: David S. Miller <davem@davemloft.net>