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authorAlexander Duyck <alexander.h.duyck@intel.com>2012-05-02 21:19:04 +0000
committerDavid S. Miller <davem@davemloft.net>2012-05-03 04:21:33 -0400
commit57b55a7ec684d8b846d6d5e67f4982363a83db7e (patch)
tree29ea3a30a701d10ba2dbcb4a003952fe8e2f23f6 /net/ipv4
parentc73c3d9c49daae8acbac4cd14bcd81626887c0e6 (diff)
downloadop-kernel-dev-57b55a7ec684d8b846d6d5e67f4982363a83db7e.zip
op-kernel-dev-57b55a7ec684d8b846d6d5e67f4982363a83db7e.tar.gz
tcp: Move code related to head frag in tcp_try_coalesce
This change reorders the code related to the use of an skb->head_frag so it is placed before we check the rest of the frags. This allows the code to read more linearly instead of like some sort of loop. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp_input.c42
1 files changed, 25 insertions, 17 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 3cb273a..41fa5df 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4562,9 +4562,31 @@ merge:
if (skb_has_frag_list(to) || skb_has_frag_list(from))
return false;
- if (skb_headlen(from) == 0 &&
- (skb_shinfo(to)->nr_frags +
- skb_shinfo(from)->nr_frags <= MAX_SKB_FRAGS)) {
+ if (skb_headlen(from) != 0) {
+ struct page *page;
+ unsigned int offset;
+
+ if (skb_shinfo(to)->nr_frags +
+ skb_shinfo(from)->nr_frags >= MAX_SKB_FRAGS)
+ return false;
+
+ if (!from->head_frag || skb_cloned(from))
+ return false;
+
+ delta = from->truesize - SKB_DATA_ALIGN(sizeof(struct sk_buff));
+
+ page = virt_to_head_page(from->head);
+ offset = from->data - (unsigned char *)page_address(page);
+
+ skb_fill_page_desc(to, skb_shinfo(to)->nr_frags,
+ page, offset, skb_headlen(from));
+ *fragstolen = true;
+ goto copyfrags;
+ } else {
+ if (skb_shinfo(to)->nr_frags +
+ skb_shinfo(from)->nr_frags > MAX_SKB_FRAGS)
+ return false;
+
delta = from->truesize -
SKB_TRUESIZE(skb_end_pointer(from) - from->head);
copyfrags:
@@ -4587,20 +4609,6 @@ copyfrags:
to->data_len += len;
goto merge;
}
- if (from->head_frag && !skb_cloned(from)) {
- struct page *page;
- unsigned int offset;
-
- if (skb_shinfo(to)->nr_frags + skb_shinfo(from)->nr_frags >= MAX_SKB_FRAGS)
- return false;
- page = virt_to_head_page(from->head);
- offset = from->data - (unsigned char *)page_address(page);
- skb_fill_page_desc(to, skb_shinfo(to)->nr_frags,
- page, offset, skb_headlen(from));
- *fragstolen = true;
- delta = from->truesize - SKB_DATA_ALIGN(sizeof(struct sk_buff));
- goto copyfrags;
- }
return false;
}
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