netdev - [PATCH net-next] selftests/net: packetdrill: add --mss option to three tests

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Message-ID: <20250710155641.3028726-1-edumazet@google.com>
Date: Thu, 10 Jul 2025 15:56:41 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Neal Cardwell <ncardwell@...gle.com>
Cc: Simon Horman <horms@...nel.org>, Kuniyuki Iwashima <kuniyu@...gle.com>, 
	Willem de Bruijn <willemb@...gle.com>, netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next] selftests/net: packetdrill: add --mss option to
 three tests

Three tests are cooking GSO packets but do not provide
gso_size information to the kernel, triggering this message:

TCP: tun0: Driver has suspect GRO implementation, TCP performance may be compromised.

Add --mss option to avoid this warning.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 .../selftests/net/packetdrill/tcp_blocking_blocking-read.pkt   | 2 ++
 tools/testing/selftests/net/packetdrill/tcp_inq_client.pkt     | 3 +++
 tools/testing/selftests/net/packetdrill/tcp_inq_server.pkt     | 3 +++
 3 files changed, 8 insertions(+)

diff --git a/tools/testing/selftests/net/packetdrill/tcp_blocking_blocking-read.pkt b/tools/testing/selftests/net/packetdrill/tcp_blocking_blocking-read.pkt
index 914eabab367aeb765a85e311513c3ca35ec27946..657e42ca65b5d4280875af49ba8775688172799d 100644
--- a/tools/testing/selftests/net/packetdrill/tcp_blocking_blocking-read.pkt
+++ b/tools/testing/selftests/net/packetdrill/tcp_blocking_blocking-read.pkt
@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0
 // Test for blocking read.
+
 --tolerance_usecs=10000
+--mss=1000
 
 `./defaults.sh`
 
diff --git a/tools/testing/selftests/net/packetdrill/tcp_inq_client.pkt b/tools/testing/selftests/net/packetdrill/tcp_inq_client.pkt
index df49c67645ac8f8bdef485f03af6e84d2b883ae9..e13f0eee97952a39a3b67cf276d01d0b9eee16cb 100644
--- a/tools/testing/selftests/net/packetdrill/tcp_inq_client.pkt
+++ b/tools/testing/selftests/net/packetdrill/tcp_inq_client.pkt
@@ -1,5 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0
 // Test TCP_INQ and TCP_CM_INQ on the client side.
+
+--mss=1000
+
 `./defaults.sh
 `
 
diff --git a/tools/testing/selftests/net/packetdrill/tcp_inq_server.pkt b/tools/testing/selftests/net/packetdrill/tcp_inq_server.pkt
index 04a5e2590c62cf725e92f137470b0bcae309eaba..14dd5f813d50eb6425bb58a72e63d47433a29cb4 100644
--- a/tools/testing/selftests/net/packetdrill/tcp_inq_server.pkt
+++ b/tools/testing/selftests/net/packetdrill/tcp_inq_server.pkt
@@ -1,5 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0
 // Test TCP_INQ and TCP_CM_INQ on the server side.
+
+--mss=1000
+
 `./defaults.sh
 `
 
-- 
2.50.0.727.gbf7dc18ff4-goog