[PATCH 4/9]: TCP: The Road to Super TSO

["David S. Miller" <davem@xxxxxxxxxxxxx>]

[TCP]: Move __tcp_data_snd_check into tcp_output.c

It reimplements portions of tcp_snd_check(), so it
we move it to tcp_output.c we can consolidate it's
logic much easier in a later change.

Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>

bdbf09522de5be3ada129dceaa3ad9da9be078bc (from 
cba5d690f46699d37df7dc087247d1f7c7155692)
diff --git a/include/net/tcp.h b/include/net/tcp.h
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -945,6 +945,7 @@ extern __u32 cookie_v4_init_sequence(str
 /* tcp_output.c */
 
 extern int tcp_write_xmit(struct sock *, int nonagle);
+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 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
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3975,16 +3975,6 @@ static inline void tcp_check_space(struc
        }
 }
 
-static 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, tp->nonagle))
-               tcp_check_probe_timer(sk, tp);
-}
-
 static __inline__ void tcp_data_snd_check(struct sock *sk)
 {
        struct sk_buff *skb = sk->sk_send_head;
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -536,6 +536,16 @@ void __tcp_push_pending_frames(struct so
        tcp_cwnd_validate(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, tp->nonagle))
+               tcp_check_probe_timer(sk, tp);
+}
+
 int tcp_may_send_now(struct sock *sk, struct tcp_sock *tp)
 {
        struct sk_buff *skb = sk->sk_send_head;