[PATCH,RFC 0/2] skb recycling (and example implementation for mv643xx_eth)

[Lennert Buytenhek <buytenh@xxxxxxxxxxxxxx>]

This implements skb recycling, which is basically just reusing skbuffs
that have finished transmitting as receive buffers, avoiding skbuff
freeing/reallocation overhead.  This is done by having the networking
provide skb_recycle_check(), which drivers can then use in their tx
ring cleanup (example implementation for mv643xx_eth included).

On mv643xx_eth, this gives a nice performance increase (~25%) when
doing packet routing, but it might be considered too ugly for mainline
-- so, feedback welcome.
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