From 179ac35f2f78ec54f14b6f3134b593403fd4c467 Mon Sep 17 00:00:00 2001 From: Yuchung Cheng Date: Fri, 25 Sep 2020 10:04:28 -0700 Subject: [PATCH] tcp: consistently check retransmit hint tcp_simple_retransmit() used for path MTU discovery may not adjust the retransmit hint properly by deducting retrans_out before checking it to adjust the hint. This patch fixes this by a correct routine tcp_mark_skb_lost() already used by the RACK loss detection. Signed-off-by: Yuchung Cheng Signed-off-by: Neal Cardwell Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/tcp_input.c | 9 ++------- net/ipv4/tcp_recovery.c | 2 +- 2 files changed, 3 insertions(+), 8 deletions(-) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 7489808..f9f4321 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -2675,13 +2675,8 @@ void tcp_simple_retransmit(struct sock *sk) skb_rbtree_walk(skb, &sk->tcp_rtx_queue) { if (tcp_skb_seglen(skb) > mss && - !(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)) { - if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) { - TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_RETRANS; - tp->retrans_out -= tcp_skb_pcount(skb); - } - tcp_skb_mark_lost_uncond_verify(tp, skb); - } + !(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)) + tcp_mark_skb_lost(sk, skb); } tcp_clear_retrans_hints_partial(tp); diff --git a/net/ipv4/tcp_recovery.c b/net/ipv4/tcp_recovery.c index fdb715b..26a4228 100644 --- a/net/ipv4/tcp_recovery.c +++ b/net/ipv4/tcp_recovery.c @@ -246,6 +246,6 @@ void tcp_newreno_mark_lost(struct sock *sk, bool snd_una_advanced) tcp_fragment(sk, TCP_FRAG_IN_RTX_QUEUE, skb, mss, mss, GFP_ATOMIC); - tcp_skb_mark_lost_uncond_verify(tp, skb); + tcp_mark_skb_lost(sk, skb); } } -- 2.7.4