From 0d580fbd2db084a5c96ee9c00492236a279d5e0f Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Tue, 3 Dec 2019 08:05:52 -0800 Subject: [PATCH] tcp: refactor tcp_retransmit_timer() It appears linux-4.14 stable needs a backport of commit 88f8598d0a30 ("tcp: exit if nothing to retransmit on RTO timeout") Since tcp_rtx_queue_empty() is not in pre 4.15 kernels, let's refactor tcp_retransmit_timer() to only use tcp_rtx_queue_head() I will provide to stable teams the squashed patches. Signed-off-by: Eric Dumazet Cc: Willem de Bruijn Cc: Greg Kroah-Hartman Acked-by: Soheil Hassas Yeganeh Signed-off-by: David S. Miller --- net/ipv4/tcp_timer.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c index dd5a6317a801..1097b438befe 100644 --- a/net/ipv4/tcp_timer.c +++ b/net/ipv4/tcp_timer.c @@ -434,6 +434,7 @@ void tcp_retransmit_timer(struct sock *sk) struct net *net = sock_net(sk); struct inet_connection_sock *icsk = inet_csk(sk); struct request_sock *req; + struct sk_buff *skb; req = rcu_dereference_protected(tp->fastopen_rsk, lockdep_sock_is_held(sk)); @@ -446,7 +447,12 @@ void tcp_retransmit_timer(struct sock *sk) */ return; } - if (!tp->packets_out || WARN_ON_ONCE(tcp_rtx_queue_empty(sk))) + + if (!tp->packets_out) + return; + + skb = tcp_rtx_queue_head(sk); + if (WARN_ON_ONCE(!skb)) return; tp->tlp_high_seq = 0; @@ -480,7 +486,7 @@ void tcp_retransmit_timer(struct sock *sk) goto out; } tcp_enter_loss(sk); - tcp_retransmit_skb(sk, tcp_rtx_queue_head(sk), 1); + tcp_retransmit_skb(sk, skb, 1); __sk_dst_reset(sk); goto out_reset_timer; }