Commit 445e0cc3 authored by Eric Dumazet's avatar Eric Dumazet Committed by Jakub Kicinski
Browse files

selftests/net: packetdrill: add tcp_ooo_rcv_mss.pkt 



We make sure tcpi_rcv_mss and tp->scaling_ratio
are correctly updated if no in-order packet has been received yet.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Reviewed-by: default avatarKuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250711114006.480026-6-edumazet@google.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 38d7e444

tools/testing/selftests/net/packetdrill/tcp_ooo_rcv_mss.pkt

0 → 100644
+27 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0



--mss=1000



`./defaults.sh

sysctl -q net.ipv4.tcp_rmem="4096 131072 $((32*1024*1024))"`



   +0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3

   +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0

   +0 bind(3, ..., ...) = 0

   +0 listen(3, 1) = 0



   +0 < S 0:0(0) win 65535 <mss 1000,nop,nop,sackOK,nop,wscale 7>

   +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 10>

  +.1 < . 1:1(0) ack 1 win 257



   +0 accept(3, ..., ...) = 4



   +0 < . 2001:11001(9000) ack 1 win 257

   +0 > . 1:1(0) ack 1 win 81 <nop,nop,sack 2001:11001>



// check that ooo packet properly updates tcpi_rcv_mss

   +0 %{ assert tcpi_rcv_mss == 1000, tcpi_rcv_mss }%



   +0 < . 11001:21001(10000) ack 1 win 257

   +0 > . 1:1(0) ack 1 win 81 <nop,nop,sack 2001:21001>