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authorIlpo Järvinen <ilpo.jarvinen@helsinki.fi>2007-04-30 00:42:20 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-30 00:58:16 -0700
commitd551e4541dd60ae53459f77a971f2d6043431f5f (patch)
treecb328b1ec7ae32ad054c9d08de0274e4056a868f /include
parent[TCP] FRTO: Delay skb available check until it's mandatory (diff)
downloadlinux-dev-d551e4541dd60ae53459f77a971f2d6043431f5f.tar.xz
linux-dev-d551e4541dd60ae53459f77a971f2d6043431f5f.zip
[TCP] FRTO: RFC4138 allows Nagle override when new data must be sent
This is a corner case where less than MSS sized new data thingie is awaiting in the send queue. For F-RTO to work correctly, a new data segment must be sent at certain point or F-RTO cannot be used at all. RFC4138 allows overriding of Nagle at that point. Implementation uses frto_counter states 2 and 3 to distinguish when Nagle override is needed. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/tcp.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index c6ecd455edab..ef8f9d4dae85 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1199,9 +1199,14 @@ static inline struct sk_buff *tcp_send_head(struct sock *sk)
static inline void tcp_advance_send_head(struct sock *sk, struct sk_buff *skb)
{
+ struct tcp_sock *tp = tcp_sk(sk);
+
sk->sk_send_head = skb->next;
if (sk->sk_send_head == (struct sk_buff *)&sk->sk_write_queue)
sk->sk_send_head = NULL;
+ /* Don't override Nagle indefinately with F-RTO */
+ if (tp->frto_counter == 2)
+ tp->frto_counter = 3;
}
static inline void tcp_check_send_head(struct sock *sk, struct sk_buff *skb_unlinked)