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[TCP] FRTO: RFC4138 allows Nagle override when new data must be sent

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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>
This commit is contained in:
Ilpo Järvinen
2007-04-30 00:42:20 -07:00
committed by David S. Miller
parent 575ee7140d
commit d551e4541d
3 changed files with 17 additions and 7 deletions
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5
include/net/tcp.h
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@@ -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)