[TCP]: Fix redundant calculations of tcp_current_mss()
tcp_write_xmit() uses tcp_current_mss(), but some of it's callers,
namely __tcp_push_pending_frames(), already has this value available
already.
While we're here, fix the "cur_mss" argument to be "unsigned int"
instead of plain "unsigned".
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 2a8409c..e292e11 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -839,11 +839,10 @@
* Returns 1, if no segments are in flight and we have queued segments, but
* cannot send anything now because of SWS or another problem.
*/
-static int tcp_write_xmit(struct sock *sk, int nonagle)
+static int tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle)
{
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb;
- unsigned int mss_now;
int sent_pkts;
/* If we are closed, the bytes will have to remain here.
@@ -853,13 +852,6 @@
if (unlikely(sk->sk_state == TCP_CLOSE))
return 0;
-
- /* Account for SACKS, we may need to fragment due to this.
- * It is just like the real MSS changing on us midstream.
- * We also handle things correctly when the user adds some
- * IP options mid-stream. Silly to do, but cover it.
- */
- mss_now = tcp_current_mss(sk, 1);
sent_pkts = 0;
while ((skb = sk->sk_send_head) &&
tcp_snd_test(sk, skb, mss_now,
@@ -897,7 +889,7 @@
* The socket must be locked by the caller.
*/
void __tcp_push_pending_frames(struct sock *sk, struct tcp_sock *tp,
- unsigned cur_mss, int nonagle)
+ unsigned int cur_mss, int nonagle)
{
struct sk_buff *skb = sk->sk_send_head;
@@ -905,7 +897,7 @@
if (!tcp_skb_is_last(sk, skb))
nonagle = TCP_NAGLE_PUSH;
if (!tcp_snd_test(sk, skb, cur_mss, nonagle) ||
- tcp_write_xmit(sk, nonagle))
+ tcp_write_xmit(sk, cur_mss, nonagle))
tcp_check_probe_timer(sk, tp);
}
}
@@ -916,7 +908,7 @@
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_write_xmit(sk, tcp_current_mss(sk, 1), tp->nonagle))
tcp_check_probe_timer(sk, tp);
}