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[TCP]: skb pcount with MTU discovery

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The problem is that when doing MTU discovery, the too-large segments in
the write queue will be calculated as having a pcount of >1.  When
tcp_write_xmit() is trying to send, tcp_snd_test() fails the cwnd test
when pcount > cwnd.

The segments are eventually transmitted one at a time by keepalive, but
this can take a long time.

This patch checks if TSO is enabled when setting pcount.

Signed-off-by: John Heffner <jheffner@psc.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2005-04-24 19:12:33 -07:00 • committed by David S. Miller
parent 158a0e45b6
commit d5ac99a648
2 changed files with 20 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

11
include/net/tcp.h
View file

@ -1417,19 +1417,20 @@ tcp_nagle_check(const struct tcp_sock *tp, const struct sk_buff *skb,
tcp_minshall_check(tp))));
}
extern void tcp_set_skb_tso_segs(struct sk_buff *, unsigned int);
extern void tcp_set_skb_tso_segs(struct sock *, struct sk_buff *);
/* This checks if the data bearing packet SKB (usually sk->sk_send_head)
* should be put on the wire right now.
*/
static __inline__ int tcp_snd_test(const struct tcp_sock *tp,
static __inline__ int tcp_snd_test(struct sock *sk,
struct sk_buff *skb,
unsigned cur_mss, int nonagle)
{
struct tcp_sock *tp = tcp_sk(sk);
int pkts = tcp_skb_pcount(skb);
if (!pkts) {
tcp_set_skb_tso_segs(skb, tp->mss_cache_std);
tcp_set_skb_tso_segs(sk, skb);
pkts = tcp_skb_pcount(skb);
}
@ -1490,7 +1491,7 @@ static __inline__ void __tcp_push_pending_frames(struct sock *sk,
if (skb) {
if (!tcp_skb_is_last(sk, skb))
nonagle = TCP_NAGLE_PUSH;
if (!tcp_snd_test(tp, skb, cur_mss, nonagle) ||
if (!tcp_snd_test(sk, skb, cur_mss, nonagle) ||
tcp_write_xmit(sk, nonagle))
tcp_check_probe_timer(sk, tp);
}
@ -1508,7 +1509,7 @@ static __inline__ int tcp_may_send_now(struct sock *sk, struct tcp_sock *tp)
struct sk_buff *skb = sk->sk_send_head;
return (skb &&
tcp_snd_test(tp, skb, tcp_current_mss(sk, 1),
tcp_snd_test(sk, skb, tcp_current_mss(sk, 1),
tcp_skb_is_last(sk, skb) ? TCP_NAGLE_PUSH : tp->nonagle));
}