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authorHerbert Xu <herbert@gondor.apana.org.au>2005-08-04 19:52:02 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-08-04 21:43:14 -0700
commitb68e9f857271189bd7a59b74c99890de9195b0e1 (patch)
tree92ef0899ca9ff07f64458febcb7ab8095e891042 /net/ipv4
parent846998ae87a80b0fd45b4cf5cf001a159d746f27 (diff)
[PATCH] tcp: fix TSO cwnd caching bug
tcp_write_xmit caches the cwnd value indirectly in cwnd_quota. When tcp_transmit_skb reduces the cwnd because of tcp_enter_cwr, the cached value becomes invalid. This patch ensures that the cwnd value is always reread after each tcp_transmit_skb call. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp_output.c34
1 files changed, 9 insertions, 25 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index e118b4b5b32..7d076f0db10 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -972,19 +972,18 @@ static int tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle)
if (unlikely(sk->sk_state == TCP_CLOSE))
return 0;
- skb = sk->sk_send_head;
- if (unlikely(!skb))
- return 0;
-
- tso_segs = tcp_init_tso_segs(sk, skb, mss_now);
- cwnd_quota = tcp_cwnd_test(tp, skb);
- if (unlikely(!cwnd_quota))
- goto out;
-
sent_pkts = 0;
- while (likely(tcp_snd_wnd_test(tp, skb, mss_now))) {
+ while ((skb = sk->sk_send_head)) {
+ tso_segs = tcp_init_tso_segs(sk, skb, mss_now);
BUG_ON(!tso_segs);
+ cwnd_quota = tcp_cwnd_test(tp, skb);
+ if (!cwnd_quota)
+ break;
+
+ if (unlikely(!tcp_snd_wnd_test(tp, skb, mss_now)))
+ break;
+
if (tso_segs == 1) {
if (unlikely(!tcp_nagle_test(tp, skb, mss_now,
(tcp_skb_is_last(sk, skb) ?
@@ -1026,27 +1025,12 @@ static int tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle)
tcp_minshall_update(tp, mss_now, skb);
sent_pkts++;
-
- /* Do not optimize this to use tso_segs. If we chopped up
- * the packet above, tso_segs will no longer be valid.
- */
- cwnd_quota -= tcp_skb_pcount(skb);
-
- BUG_ON(cwnd_quota < 0);
- if (!cwnd_quota)
- break;
-
- skb = sk->sk_send_head;
- if (!skb)
- break;
- tso_segs = tcp_init_tso_segs(sk, skb, mss_now);
}
if (likely(sent_pkts)) {
tcp_cwnd_validate(sk, tp);
return 0;
}
-out:
return !tp->packets_out && sk->sk_send_head;
}