netdev - [PATCH net-next 3/3] selftests/net: remove unnecessary MTU config in big

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Message-ID: <20251127091325.7248-4-maklimek97@gmail.com>
Date: Thu, 27 Nov 2025 10:13:25 +0100
From: Mariusz Klimek <maklimek97@...il.com>
To: netdev@...r.kernel.org
Cc: Mariusz Klimek <maklimek97@...il.com>
Subject: [PATCH net-next 3/3] selftests/net: remove unnecessary MTU config in big_tcp.sh

This patch removes the manual lowering of the client MTU in big_tcp.sh. The
MTU lowering was previously required as a work-around due to a bug in the
MTU validation of BIG TCP jumbograms. The MTU was lowered to 1442, but note
that 1492 (1500 - 8) would of worked just as well. Now that the bug has
been fixed, the manual client MTU modification can be removed entirely.

Signed-off-by: Mariusz Klimek <maklimek97@...il.com>
---
 tools/testing/selftests/net/big_tcp.sh | 1 -
 1 file changed, 1 deletion(-)

diff --git a/tools/testing/selftests/net/big_tcp.sh b/tools/testing/selftests/net/big_tcp.sh
index 2db9d15cd45f..b5d9145296d3 100755
--- a/tools/testing/selftests/net/big_tcp.sh
+++ b/tools/testing/selftests/net/big_tcp.sh
@@ -32,7 +32,6 @@ setup() {
 	ip -net $ROUTER_NS link add link2 type veth peer name link3 netns $SERVER_NS
 
 	ip -net $CLIENT_NS link set link0 up
-	ip -net $CLIENT_NS link set link0 mtu 1442
 	ip -net $CLIENT_NS addr add $CLIENT_IP4/24 dev link0
 	ip -net $CLIENT_NS addr add $CLIENT_IP6/64 dev link0 nodad
 	ip -net $CLIENT_NS route add $SERVER_IP4 dev link0 via $CLIENT_GW4
-- 
2.47.3