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authorDavid S. Miller <davem@sunset.davemloft.net>2005-04-24 19:12:33 -0700
committerDavid S. Miller <davem@davemloft.net>2005-04-24 19:12:33 -0700
commitd5ac99a648b8c61d0c7f1c32a8ab7f1dca0123d2 (patch)
tree3811d84e83dab918c57aeca1081ae343cb97df8b /net/ipv4/tcp_output.c
parent158a0e45b69254a9ee4d7795e3b98d8c959fb799 (diff)
downloadlinux-stericsson-d5ac99a648b8c61d0c7f1c32a8ab7f1dca0123d2.tar.gz
[TCP]: skb pcount with MTU discovery
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>
Diffstat (limited to 'net/ipv4/tcp_output.c')
-rw-r--r--net/ipv4/tcp_output.c25
1 files changed, 14 insertions, 11 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 13c14cb6dee4..a12df6979ffd 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -427,7 +427,7 @@ void tcp_push_one(struct sock *sk, unsigned cur_mss)
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb = sk->sk_send_head;
- if (tcp_snd_test(tp, skb, cur_mss, TCP_NAGLE_PUSH)) {
+ if (tcp_snd_test(sk, skb, cur_mss, TCP_NAGLE_PUSH)) {
/* Send it out now. */
TCP_SKB_CB(skb)->when = tcp_time_stamp;
tcp_tso_set_push(skb);
@@ -440,9 +440,12 @@ void tcp_push_one(struct sock *sk, unsigned cur_mss)
}
}
-void tcp_set_skb_tso_segs(struct sk_buff *skb, unsigned int mss_std)
+void tcp_set_skb_tso_segs(struct sock *sk, struct sk_buff *skb)
{
- if (skb->len <= mss_std) {
+ struct tcp_sock *tp = tcp_sk(sk);
+
+ if (skb->len <= tp->mss_cache_std ||
+ !(sk->sk_route_caps & NETIF_F_TSO)) {
/* Avoid the costly divide in the normal
* non-TSO case.
*/
@@ -451,10 +454,10 @@ void tcp_set_skb_tso_segs(struct sk_buff *skb, unsigned int mss_std)
} else {
unsigned int factor;
- factor = skb->len + (mss_std - 1);
- factor /= mss_std;
+ factor = skb->len + (tp->mss_cache_std - 1);
+ factor /= tp->mss_cache_std;
skb_shinfo(skb)->tso_segs = factor;
- skb_shinfo(skb)->tso_size = mss_std;
+ skb_shinfo(skb)->tso_size = tp->mss_cache_std;
}
}
@@ -525,8 +528,8 @@ static int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len)
}
/* Fix up tso_factor for both original and new SKB. */
- tcp_set_skb_tso_segs(skb, tp->mss_cache_std);
- tcp_set_skb_tso_segs(buff, tp->mss_cache_std);
+ tcp_set_skb_tso_segs(sk, skb);
+ tcp_set_skb_tso_segs(sk, buff);
if (TCP_SKB_CB(skb)->sacked & TCPCB_LOST) {
tp->lost_out += tcp_skb_pcount(skb);
@@ -601,7 +604,7 @@ int tcp_trim_head(struct sock *sk, struct sk_buff *skb, u32 len)
* factor and mss.
*/
if (tcp_skb_pcount(skb) > 1)
- tcp_set_skb_tso_segs(skb, tcp_skb_mss(skb));
+ tcp_set_skb_tso_segs(sk, skb);
return 0;
}
@@ -752,7 +755,7 @@ int tcp_write_xmit(struct sock *sk, int nonagle)
mss_now = tcp_current_mss(sk, 1);
while ((skb = sk->sk_send_head) &&
- tcp_snd_test(tp, skb, mss_now,
+ tcp_snd_test(sk, skb, mss_now,
tcp_skb_is_last(sk, skb) ? nonagle :
TCP_NAGLE_PUSH)) {
if (skb->len > mss_now) {
@@ -1676,7 +1679,7 @@ int tcp_write_wakeup(struct sock *sk)
tp->mss_cache = tp->mss_cache_std;
}
} else if (!tcp_skb_pcount(skb))
- tcp_set_skb_tso_segs(skb, tp->mss_cache_std);
+ tcp_set_skb_tso_segs(sk, skb);
TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_PSH;
TCP_SKB_CB(skb)->when = tcp_time_stamp;