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tcp: Remove check in __tcp_push_pending_frames

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tcp_push checks tcp_send_head and calls __tcp_push_pending_frames,
which again checks tcp_send_head, and this unnecessary check is
done for every other caller of __tcp_push_pending_frames.

Remove tcp_send_head check in __tcp_push_pending_frames and add
the check to tcp_push_pending_frames. Other functions call
__tcp_push_pending_frames only when tcp_send_head would evaluate
to true.

Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com>
Acked-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Krishna Kumar 2009-12-08 22:26:13 +00:00 • committed by David S. Miller
parent 7ef8a2127a
commit 12d50c46dc
2 changed files with 9 additions and 12 deletions
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16
include/net/tcp.h
View file

@ -856,13 +856,6 @@ static inline void tcp_check_probe_timer(struct sock *sk)
icsk->icsk_rto, TCP_RTO_MAX); icsk->icsk_rto, TCP_RTO_MAX);
} }
static inline void tcp_push_pending_frames(struct sock *sk)
{
struct tcp_sock *tp = tcp_sk(sk);
__tcp_push_pending_frames(sk, tcp_current_mss(sk), tp->nonagle);
}
static inline void tcp_init_wl(struct tcp_sock *tp, u32 seq) static inline void tcp_init_wl(struct tcp_sock *tp, u32 seq)
{ {
tp->snd_wl1 = seq; tp->snd_wl1 = seq;
@ -1342,6 +1335,15 @@ static inline int tcp_write_queue_empty(struct sock *sk)
return skb_queue_empty(&sk->sk_write_queue); return skb_queue_empty(&sk->sk_write_queue);
} }
static inline void tcp_push_pending_frames(struct sock *sk)
{
if (tcp_send_head(sk)) {
struct tcp_sock *tp = tcp_sk(sk);
__tcp_push_pending_frames(sk, tcp_current_mss(sk), tp->nonagle);
}
}
/* Start sequence of the highest skb with SACKed bit, valid only if /* Start sequence of the highest skb with SACKed bit, valid only if
* sacked > 0 or when the caller has ensured validity by itself. * sacked > 0 or when the caller has ensured validity by itself.
*/ */

5
net/ipv4/tcp_output.c
View file

@ -1794,11 +1794,6 @@ static int tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
void __tcp_push_pending_frames(struct sock *sk, unsigned int cur_mss, void __tcp_push_pending_frames(struct sock *sk, unsigned int cur_mss,
int nonagle) int nonagle)
{ {
struct sk_buff *skb = tcp_send_head(sk);
if (!skb)
return;
/* If we are closed, the bytes will have to remain here. /* If we are closed, the bytes will have to remain here.
* In time closedown will finish, we empty the write queue and * In time closedown will finish, we empty the write queue and
* all will be happy. * all will be happy.