[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>

3 files changed, 8 insertions, 25 deletions

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 9416236cc395..b19238027da8 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -848,7 +848,6 @@ extern __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb,
 
 /* tcp_output.c */
 
-extern void __tcp_data_snd_check(struct sock *sk, struct sk_buff *skb);
 extern void __tcp_push_pending_frames(struct sock *sk, struct tcp_sock *tp,
                                       unsigned int cur_mss, int nonagle);
 extern int tcp_may_send_now(struct sock *sk, struct tcp_sock *tp);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 577424323d59..b27be2f819ac 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3346,12 +3346,9 @@ static inline void tcp_check_space(struct sock *sk)
         }
 }
 
-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 @@ int tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
                                  */
                                 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 @@ int tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
                         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 @@ step5:
         /* 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 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
                 /* 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 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
 
         /* 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 e292e11c7319..ce1d7cfbecfc 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -894,24 +894,11 @@ void __tcp_push_pending_frames(struct sock *sk, struct tcp_sock *tp,
         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
  *