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tcp: TLP retransmits last if failed to send new packet

Browse source 
When TLP fails to send new packet because of receive window
limit, it should fall back to retransmit the last packet instead.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Nandita Dukkipati <nanditad@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuchung Cheng 2015-08-12 11:18:19 -07:00 committed by David S. Miller
parent fcd16c0a95
commit b340b26454
1 changed files with 22 additions and 16 deletions
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38
net/ipv4/tcp_output.c
View file

@ -2149,7 +2149,7 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
tcp_cwnd_validate(sk, is_cwnd_limited);
return false;
}
return (push_one == 2) || (!tp->packets_out && tcp_send_head(sk));
return !tp->packets_out && tcp_send_head(sk);
}
bool tcp_schedule_loss_probe(struct sock *sk)
@ -2226,7 +2226,7 @@ static bool skb_still_in_host_queue(const struct sock *sk,
return false;
}
/* When probe timeout (PTO) fires, send a new segment if one exists, else
/* When probe timeout (PTO) fires, try send a new segment if possible, else
* retransmit the last segment.
*/
void tcp_send_loss_probe(struct sock *sk)
@ -2235,11 +2235,19 @@ void tcp_send_loss_probe(struct sock *sk)
struct sk_buff *skb;
int pcount;
int mss = tcp_current_mss(sk);
int err = -1;
if (tcp_send_head(sk)) {
err = tcp_write_xmit(sk, mss, TCP_NAGLE_OFF, 2, GFP_ATOMIC);
goto rearm_timer;
skb = tcp_send_head(sk);
if (skb) {
if (tcp_snd_wnd_test(tp, skb, mss)) {
pcount = tp->packets_out;
tcp_write_xmit(sk, mss, TCP_NAGLE_OFF, 2, GFP_ATOMIC);
if (tp->packets_out > pcount)
goto probe_sent;
goto rearm_timer;
}
skb = tcp_write_queue_prev(sk, skb);
} else {
skb = tcp_write_queue_tail(sk);
}
/* At most one outstanding TLP retransmission. */
@ -2247,7 +2255,6 @@ void tcp_send_loss_probe(struct sock *sk)
goto rearm_timer;
/* Retransmit last segment. */
skb = tcp_write_queue_tail(sk);
if (WARN_ON(!skb))
goto rearm_timer;
@ -2262,24 +2269,23 @@ void tcp_send_loss_probe(struct sock *sk)
if (unlikely(tcp_fragment(sk, skb, (pcount - 1) * mss, mss,
GFP_ATOMIC)))
goto rearm_timer;
skb = tcp_write_queue_tail(sk);
skb = tcp_write_queue_next(sk, skb);
}
if (WARN_ON(!skb || !tcp_skb_pcount(skb)))
goto rearm_timer;
err = __tcp_retransmit_skb(sk, skb);
if (__tcp_retransmit_skb(sk, skb))
goto rearm_timer;
/* Record snd_nxt for loss detection. */
if (likely(!err))
tp->tlp_high_seq = tp->snd_nxt;
tp->tlp_high_seq = tp->snd_nxt;
probe_sent:
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPLOSSPROBES);
/* Reset s.t. tcp_rearm_rto will restart timer from now */
inet_csk(sk)->icsk_pending = 0;
rearm_timer:
if (likely(!err)) {
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPLOSSPROBES);
/* Reset s.t. tcp_rearm_rto will restart timer from now */
inet_csk(sk)->icsk_pending = 0;
}
tcp_rearm_rto(sk);
}