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[tcp] Discard packets that lie immediately before the receive window

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We will currently enqueue (rather than discard) retransmitted packets
that lie immediately before the current receive window.  These packets
will be harmlessly discarded when the receive queue is processed
immediately afterwards, but cause confusion when attempting to debug
TCP performance issues.

Fix by adjusting the comparison so that packets that lie immediately
before the receive window will be discarded immediately and never
enqueued.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2026-01-09 13:18:20 +00:00
parent ff6d612e72
commit 8e557f1ab0
1 changed files with 1 additions and 1 deletions
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2
src/net/tcp.c
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@@ -1317,7 +1317,7 @@ static void tcp_rx_enqueue ( struct tcp_connection *tcp, uint32_t seq,
*/
if ( ( ! ( tcp->tcp_state & TCP_STATE_RCVD ( TCP_SYN ) ) ) ||
( tcp_cmp ( seq, tcp->rcv_ack + tcp->rcv_win ) >= 0 ) ||
( tcp_cmp ( nxt, tcp->rcv_ack ) < 0 ) ||
( tcp_cmp ( nxt, tcp->rcv_ack ) <= 0 ) ||
( seq_len == 0 ) ) {
free_iob ( iobuf );
return;