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net: splice: fix __splice_segment() 

commit 9ca1b22d6d (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>
wifi-calibration
Eric Dumazet 2013-01-11 14:46:37 +00:00 committed by David S. Miller
parent fb0174723e
commit 18aafc622a
1 changed files with 15 additions and 13 deletions
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28
net/core/skbuff.c
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@ -1652,7 +1652,7 @@ 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);
@ -1685,14 +1685,14 @@ 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;
}
@ -1711,13 +1711,11 @@ 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;
@ -1732,12 +1730,16 @@ static bool __splice_segment(struct page *page, unsigned int poff,
plen -= *off;
*off = 0;
flen = min(*len, plen);
do {
unsigned int flen = min(*len, plen);
if (spd_fill_page(spd, pipe, page, &flen, poff, skb, linear, sk))
return true;
*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;
}
@ -1760,7 +1762,7 @@ 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;
@ -1773,7 +1775,7 @@ 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;
}