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tcp: adjust rcvbuf in presence of reorders

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This patch takes care of the needed provisioning
when incoming packets are stored in the out of order queue.

This part was not implemented in the correct way, we need
to decouple it from tcp_rcv_space_adjust() logic.

Without it, stalls in the pipe could happen.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250513193919.1089692-4-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2025-05-13 19:39:11 +00:00 committed by Jakub Kicinski
parent 65c5287892
commit 63ad7dfedf
1 changed files with 4 additions and 0 deletions
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4
net/ipv4/tcp_input.c
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@ -760,6 +760,9 @@ static void tcp_rcvbuf_grow(struct sock *sk)
/* slow start: allow the sender to double its rate. */
rcvwin = tp->rcvq_space.space << 1;
if (!RB_EMPTY_ROOT(&tp->out_of_order_queue))
rcvwin += TCP_SKB_CB(tp->ooo_last_skb)->end_seq - tp->rcv_nxt;
cap = READ_ONCE(net->ipv4.sysctl_tcp_rmem[2]);
rcvbuf = min_t(u32, tcp_space_from_win(sk, rcvwin), cap);
@ -5166,6 +5169,7 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb)
skb_condense(skb);
skb_set_owner_r(skb, sk);
}
tcp_rcvbuf_grow(sk);
}
static int __must_check tcp_queue_rcv(struct sock *sk, struct sk_buff *skb,