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tcp: use tcp_write_xmit also in tcp_push_one 

tcp_minshall_update is not significant difference since it only
checks for not full-sized skb which is BUG'ed on the push_one
path anyway.

tcp_snd_test is tcp_nagle_test+tcp_cwnd_test+tcp_snd_wnd_test,
just the order changed slightly.

net/ipv4/tcp_output.c:
  tcp_snd_test              |  -89
  tcp_mss_split_point       |  -91
  tcp_may_send_now          |  +53
  tcp_cwnd_validate         |  -98
  tso_fragment              | -239
  __tcp_push_pending_frames | -1340
  tcp_push_one              | -146
 7 functions changed, 53 bytes added, 2003 bytes removed, diff: -1950

net/ipv4/tcp_output.c:
  tcp_write_xmit | +1772
 1 function changed, 1772 bytes added, diff: +1772

tcp_output.o.new:
 8 functions changed, 1825 bytes added, 2003 bytes removed, diff: -178

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2008-12-05 22:48:55 -08:00 committed by David S. Miller
parent 730c30ec64
commit d5dd9175bc
1 changed files with 17 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
net/ipv4/tcp_output.c
View File

@ -1519,7 +1519,8 @@ static int tcp_mtu_probe(struct sock *sk)
* 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, unsigned int mss_now, int nonagle)
static int tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
int push_one, gfp_t gfp)
{
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb;
@ -1529,11 +1530,14 @@ static int tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle)
sent_pkts = 0;
/* Do MTU probing. */
if ((result = tcp_mtu_probe(sk)) == 0) {
return 0;
} else if (result > 0) {
sent_pkts = 1;
if (!push_one) {
/* Do MTU probing. */
result = tcp_mtu_probe(sk);
if (!result) {
return 0;
} else if (result > 0) {
sent_pkts = 1;
}
}
while ((skb = tcp_send_head(sk))) {
@ -1555,7 +1559,7 @@ static int tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle)
nonagle : TCP_NAGLE_PUSH))))
break;
} else {
if (tcp_tso_should_defer(sk, skb))
if (!push_one && tcp_tso_should_defer(sk, skb))
break;
}
@ -1570,7 +1574,7 @@ static int tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle)
TCP_SKB_CB(skb)->when = tcp_time_stamp;
if (unlikely(tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC)))
if (unlikely(tcp_transmit_skb(sk, skb, 1, gfp)))
break;
/* Advance the send_head. This one is sent out.
@ -1580,6 +1584,9 @@ static int tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle)
tcp_minshall_update(tp, mss_now, skb);
sent_pkts++;
if (push_one)
break;
}
if (likely(sent_pkts)) {
@ -1608,7 +1615,7 @@ void __tcp_push_pending_frames(struct sock *sk, unsigned int cur_mss,
if (unlikely(sk->sk_state == TCP_CLOSE))
return;
if (tcp_write_xmit(sk, cur_mss, nonagle))
if (tcp_write_xmit(sk, cur_mss, nonagle, 0, GFP_ATOMIC))
tcp_check_probe_timer(sk);
}
@ -1617,38 +1624,11 @@ void __tcp_push_pending_frames(struct sock *sk, unsigned int cur_mss,
*/
void tcp_push_one(struct sock *sk, unsigned int mss_now)
{
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb = tcp_send_head(sk);
unsigned int tso_segs, cwnd_quota;
BUG_ON(!skb || skb->len < mss_now);
tso_segs = tcp_init_tso_segs(sk, skb, mss_now);
cwnd_quota = tcp_snd_test(sk, skb, mss_now, TCP_NAGLE_PUSH);
if (likely(cwnd_quota)) {
unsigned int limit;
BUG_ON(!tso_segs);
limit = mss_now;
if (tso_segs > 1 && !tcp_urg_mode(tp))
limit = tcp_mss_split_point(sk, skb, mss_now,
cwnd_quota);
if (skb->len > limit &&
unlikely(tso_fragment(sk, skb, limit, mss_now)))
return;
/* Send it out now. */
TCP_SKB_CB(skb)->when = tcp_time_stamp;
if (likely(!tcp_transmit_skb(sk, skb, 1, sk->sk_allocation))) {
tcp_event_new_data_sent(sk, skb);
tcp_cwnd_validate(sk);
return;
}
}
tcp_write_xmit(sk, mss_now, TCP_NAGLE_PUSH, 1, sk->sk_allocation);
}
/* This function returns the amount that we can raise the