@@ -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
tcp_minshall_update is not significant difference since it only checks for not full-sized skb which is BUG'ed one 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> --- net/ipv4/tcp_output.c | 54 +++++++++++++++--------------------------------- 1 files changed, 17 insertions(+), 37 deletions(-)