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| author | Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> | 2007-04-30 00:42:20 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-30 00:58:16 -0700 |
| commit | d551e4541dd60ae53459f77a971f2d6043431f5f (patch) | |
| tree | cb328b1ec7ae32ad054c9d08de0274e4056a868f /include | |
| parent | 575ee7140dabe9b9c4f66f4f867039b97e548867 (diff) | |
| download | op-kernel-dev-d551e4541dd60ae53459f77a971f2d6043431f5f.zip op-kernel-dev-d551e4541dd60ae53459f77a971f2d6043431f5f.tar.gz | |
[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.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index c6ecd45..ef8f9d4 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) |
