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authorEric Dumazet <edumazet@google.com>2013-01-11 14:46:37 +0000
committerDavid S. Miller <davem@davemloft.net>2013-01-20 23:19:36 -0500
commitbc9540c637c3d8712ccbf9dcf28621f380ed5e64 (patch)
tree6d5d870889eace5924999667c47b0464bb1a3b0c /net/core
parent82bda6195615891181115f579a480aa5001ce7e9 (diff)
downloadlinux-bc9540c637c3d8712ccbf9dcf28621f380ed5e64.tar.bz2
net: splice: fix __splice_segment()
commit 9ca1b22d6d2 (net: splice: avoid high order page splitting) forgot that skb->head could need a copy into several page frags. This could be the case for loopback traffic mostly. Also remove now useless skb argument from linear_to_page() and __splice_segment() prototypes. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Willy Tarreau <w@1wt.eu> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/skbuff.c28
1 files changed, 15 insertions, 13 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index f5dfdf7727c4..a9a2ae3e2213 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1649,7 +1649,7 @@ static void sock_spd_release(struct splice_pipe_desc *spd, unsigned int i)
static struct page *linear_to_page(struct page *page, unsigned int *len,
unsigned int *offset,
- struct sk_buff *skb, struct sock *sk)
+ struct sock *sk)
{
struct page_frag *pfrag = sk_page_frag(sk);
@@ -1682,14 +1682,14 @@ static bool spd_can_coalesce(const struct splice_pipe_desc *spd,
static bool spd_fill_page(struct splice_pipe_desc *spd,
struct pipe_inode_info *pipe, struct page *page,
unsigned int *len, unsigned int offset,
- struct sk_buff *skb, bool linear,
+ bool linear,
struct sock *sk)
{
if (unlikely(spd->nr_pages == MAX_SKB_FRAGS))
return true;
if (linear) {
- page = linear_to_page(page, len, &offset, skb, sk);
+ page = linear_to_page(page, len, &offset, sk);
if (!page)
return true;
}
@@ -1708,13 +1708,11 @@ static bool spd_fill_page(struct splice_pipe_desc *spd,
static bool __splice_segment(struct page *page, unsigned int poff,
unsigned int plen, unsigned int *off,
- unsigned int *len, struct sk_buff *skb,
+ unsigned int *len,
struct splice_pipe_desc *spd, bool linear,
struct sock *sk,
struct pipe_inode_info *pipe)
{
- unsigned int flen;
-
if (!*len)
return true;
@@ -1729,12 +1727,16 @@ static bool __splice_segment(struct page *page, unsigned int poff,
plen -= *off;
*off = 0;
- flen = min(*len, plen);
-
- if (spd_fill_page(spd, pipe, page, &flen, poff, skb, linear, sk))
- return true;
+ do {
+ unsigned int flen = min(*len, plen);
- *len -= flen;
+ if (spd_fill_page(spd, pipe, page, &flen, poff,
+ linear, sk))
+ return true;
+ poff += flen;
+ plen -= flen;
+ *len -= flen;
+ } while (*len && plen);
return false;
}
@@ -1757,7 +1759,7 @@ static bool __skb_splice_bits(struct sk_buff *skb, struct pipe_inode_info *pipe,
if (__splice_segment(virt_to_page(skb->data),
(unsigned long) skb->data & (PAGE_SIZE - 1),
skb_headlen(skb),
- offset, len, skb, spd,
+ offset, len, spd,
skb_head_is_locked(skb),
sk, pipe))
return true;
@@ -1770,7 +1772,7 @@ static bool __skb_splice_bits(struct sk_buff *skb, struct pipe_inode_info *pipe,
if (__splice_segment(skb_frag_page(f),
f->page_offset, skb_frag_size(f),
- offset, len, skb, spd, false, sk, pipe))
+ offset, len, spd, false, sk, pipe))
return true;
}