[TCP]: Fix __tcp_push_pending_frames() 'nonagle' handling.
'nonagle' should be passed to the tcp_snd_test() function
as 'TCP_NAGLE_PUSH' if we are checking an SKB not at the
tail of the write_queue. This is because Nagle does not
apply to such frames since we cannot possibly tack more
data onto them.
However, while doing this __tcp_push_pending_frames() makes
all of the packets in the write_queue use this modified
'nonagle' value.
Fix the bug and simplify this function by just calling
tcp_write_xmit() directly if sk_send_head is non-NULL.
As a result, we can now make tcp_data_snd_check() just call
tcp_push_pending_frames() instead of the specialized
__tcp_data_snd_check().
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 5774243..b27be2f 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3346,12 +3346,9 @@
}
}
-static __inline__ void tcp_data_snd_check(struct sock *sk)
+static __inline__ void tcp_data_snd_check(struct sock *sk, struct tcp_sock *tp)
{
- struct sk_buff *skb = sk->sk_send_head;
-
- if (skb != NULL)
- __tcp_data_snd_check(sk, skb);
+ tcp_push_pending_frames(sk, tp);
tcp_check_space(sk);
}
@@ -3645,7 +3642,7 @@
*/
tcp_ack(sk, skb, 0);
__kfree_skb(skb);
- tcp_data_snd_check(sk);
+ tcp_data_snd_check(sk, tp);
return 0;
} else { /* Header too small */
TCP_INC_STATS_BH(TCP_MIB_INERRS);
@@ -3711,7 +3708,7 @@
if (TCP_SKB_CB(skb)->ack_seq != tp->snd_una) {
/* Well, only one small jumplet in fast path... */
tcp_ack(sk, skb, FLAG_DATA);
- tcp_data_snd_check(sk);
+ tcp_data_snd_check(sk, tp);
if (!tcp_ack_scheduled(tp))
goto no_ack;
}
@@ -3789,7 +3786,7 @@
/* step 7: process the segment text */
tcp_data_queue(sk, skb);
- tcp_data_snd_check(sk);
+ tcp_data_snd_check(sk, tp);
tcp_ack_snd_check(sk);
return 0;
@@ -4099,7 +4096,7 @@
/* Do step6 onward by hand. */
tcp_urg(sk, skb, th);
__kfree_skb(skb);
- tcp_data_snd_check(sk);
+ tcp_data_snd_check(sk, tp);
return 0;
}
@@ -4290,7 +4287,7 @@
/* tcp_data could move socket to TIME-WAIT */
if (sk->sk_state != TCP_CLOSE) {
- tcp_data_snd_check(sk);
+ tcp_data_snd_check(sk, tp);
tcp_ack_snd_check(sk);
}
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index e292e11..ce1d7cf 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -894,24 +894,11 @@
struct sk_buff *skb = sk->sk_send_head;
if (skb) {
- if (!tcp_skb_is_last(sk, skb))
- nonagle = TCP_NAGLE_PUSH;
- if (!tcp_snd_test(sk, skb, cur_mss, nonagle) ||
- tcp_write_xmit(sk, cur_mss, nonagle))
+ if (tcp_write_xmit(sk, cur_mss, nonagle))
tcp_check_probe_timer(sk, tp);
}
}
-void __tcp_data_snd_check(struct sock *sk, struct sk_buff *skb)
-{
- struct tcp_sock *tp = tcp_sk(sk);
-
- if (after(TCP_SKB_CB(skb)->end_seq, tp->snd_una + tp->snd_wnd) ||
- tcp_packets_in_flight(tp) >= tp->snd_cwnd ||
- tcp_write_xmit(sk, tcp_current_mss(sk, 1), tp->nonagle))
- tcp_check_probe_timer(sk, tp);
-}
-
/* This function returns the amount that we can raise the
* usable window based on the following constraints
*
