From 7c1c7308592f0f261836a96e37b7835ffd10d85b Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Tue, 25 Apr 2017 10:15:33 -0700 Subject: [PATCH] tcp: do not pass timestamp to tcp_rack_detect_loss() We can use tp->tcp_mstamp as it contains a recent timestamp. This removes a call to skb_mstamp_get() from tcp_rack_reo_timeout() Signed-off-by: Eric Dumazet Acked-by: Soheil Hassas Yeganeh Acked-by: Neal Cardwell Signed-off-by: David S. Miller --- net/ipv4/tcp_recovery.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/net/ipv4/tcp_recovery.c b/net/ipv4/tcp_recovery.c index d8acbd9f477a..fdac262e277b 100644 --- a/net/ipv4/tcp_recovery.c +++ b/net/ipv4/tcp_recovery.c @@ -45,8 +45,7 @@ static bool tcp_rack_sent_after(const struct skb_mstamp *t1, * or tcp_time_to_recover()'s "Trick#1: the loss is proven" code path will * make us enter the CA_Recovery state. */ -static void tcp_rack_detect_loss(struct sock *sk, const struct skb_mstamp *now, - u32 *reo_timeout) +static void tcp_rack_detect_loss(struct sock *sk, u32 *reo_timeout) { struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; @@ -79,7 +78,7 @@ static void tcp_rack_detect_loss(struct sock *sk, const struct skb_mstamp *now, * A packet is lost if its elapsed time is beyond * the recent RTT plus the reordering window. */ - u32 elapsed = skb_mstamp_us_delta(now, + u32 elapsed = skb_mstamp_us_delta(&tp->tcp_mstamp, &skb->skb_mstamp); s32 remaining = tp->rack.rtt_us + reo_wnd - elapsed; @@ -115,7 +114,7 @@ void tcp_rack_mark_lost(struct sock *sk, const struct skb_mstamp *now) /* Reset the advanced flag to avoid unnecessary queue scanning */ tp->rack.advanced = 0; - tcp_rack_detect_loss(sk, now, &timeout); + tcp_rack_detect_loss(sk, &timeout); if (timeout) { timeout = usecs_to_jiffies(timeout + TCP_REO_TIMEOUT_MIN); inet_csk_reset_xmit_timer(sk, ICSK_TIME_REO_TIMEOUT, @@ -165,12 +164,10 @@ void tcp_rack_advance(struct tcp_sock *tp, u8 sacked, u32 end_seq, void tcp_rack_reo_timeout(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); - struct skb_mstamp now; u32 timeout, prior_inflight; - skb_mstamp_get(&now); prior_inflight = tcp_packets_in_flight(tp); - tcp_rack_detect_loss(sk, &now, &timeout); + tcp_rack_detect_loss(sk, &timeout); if (prior_inflight != tcp_packets_in_flight(tp)) { if (inet_csk(sk)->icsk_ca_state != TCP_CA_Recovery) { tcp_enter_recovery(sk, false); -- 2.20.1