net: makes skb_splice_bits() aware of skb->head_frag
authorEric Dumazet <edumazet@google.com>
Fri, 27 Apr 2012 02:10:03 +0000 (02:10 +0000)
committerDavid S. Miller <davem@davemloft.net>
Tue, 1 May 2012 01:35:50 +0000 (21:35 -0400)
commit1d0c0b328a63826b7c80c27d1c4f2b04e8225273
tree62b8cb1fcfe51311019d26a4688ef58169ff4362
parent329033f645d93b5f9160b9b972dbc5431ad22a33
net: makes skb_splice_bits() aware of skb->head_frag

__skb_splice_bits() can check if skb to be spliced has its skb->head
mapped to a page fragment, instead of a kmalloc() area.

If so we can avoid a copy of the skb head and get a reference on
underlying page.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Maciej Żenczykowski <maze@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Tom Herbert <therbert@google.com>
Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Cc: Ben Hutchings <bhutchings@solarflare.com>
Cc: Matt Carlson <mcarlson@broadcom.com>
Cc: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/skbuff.c