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>

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 09cc38651b2f49818121d7c5ebfefae497b4fa41..52ba2b5e803d89906ab598bcf5462eb48dca4193 100644 (file)
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1699,14 +1699,18 @@ static bool __skb_splice_bits(struct sk_buff *skb, struct pipe_inode_info *pipe,
                              struct splice_pipe_desc *spd, struct sock *sk)
 {
        int seg;
+       bool head_is_linear = !skb->head_frag;
 
-       /*
-        * map the linear part
+       /* map the linear part :
+        * If skb->head_frag is set, this 'linear' part is backed
+        * by a fragment, and we can avoid a copy.
         */
        if (__splice_segment(virt_to_page(skb->data),
                             (unsigned long) skb->data & (PAGE_SIZE - 1),
                             skb_headlen(skb),
-                            offset, len, skb, spd, true, sk, pipe))
+                            offset, len, skb, spd,
+                            head_is_linear,
+                            sk, pipe))
                return true;
 
        /*