linux-kernel - [PATCH 3/5] selftests: net: run reuseport tests in netns to avoid port conflicts

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Message-ID: <20260120230558.328423-4-aleksey.oladko@virtuozzo.com>
Date: Tue, 20 Jan 2026 23:05:56 +0000
From: Aleksei Oladko <aleksey.oladko@...tuozzo.com>
To: "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
        Shuah Khan <shuah@...nel.org>
Cc: netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Konstantin Khorenko <khorenko@...tuozzo.com>
Subject: [PATCH 3/5] selftests: net: run reuseport tests in netns to avoid port conflicts

From: Konstantin Khorenko <khorenko@...tuozzo.com>

Some net kselftests use fixed ports which overlap with process-exporter
service already running on the host. When such a conflict happens,
the test fail with:

  failed to bind receive socket: Address already in use

Instead of changing port numbers, run the affected tests in isolated
network namespace to avoid conflicts with running daemons.

Signed-off-by: Konstantin Khorenko <khorenko@...tuozzo.com>
---
 tools/testing/selftests/net/Makefile               | 12 ++++++++----
 tools/testing/selftests/net/reuseport_bpf.sh       |  4 ++++
 tools/testing/selftests/net/reuseport_bpf_cpu.sh   |  4 ++++
 tools/testing/selftests/net/reuseport_bpf_numa.sh  |  4 ++++
 tools/testing/selftests/net/reuseport_dualstack.sh |  4 ++++
 5 files changed, 24 insertions(+), 4 deletions(-)
 create mode 100755 tools/testing/selftests/net/reuseport_bpf.sh
 create mode 100755 tools/testing/selftests/net/reuseport_bpf_cpu.sh
 create mode 100755 tools/testing/selftests/net/reuseport_bpf_numa.sh
 create mode 100755 tools/testing/selftests/net/reuseport_dualstack.sh

diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index b66ba04f19d9..a160e0d816d9 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -64,6 +64,10 @@ TEST_PROGS := \
 	psock_snd.sh \
 	reuseaddr_ports_exhausted.sh \
 	reuseport_addr_any.sh \
+	reuseport_bpf.sh \
+	reuseport_bpf_cpu.sh \
+	reuseport_bpf_numa.sh \
+	reuseport_dualstack.sh
 	route_hint.sh \
 	route_localnet.sh \
 	rps_default_mask.sh \
@@ -142,6 +146,10 @@ TEST_GEN_FILES := \
 	psock_tpacket \
 	reuseaddr_ports_exhausted \
 	reuseport_addr_any \
+	reuseport_bpf \
+	reuseport_bpf_cpu \
+	reuseport_bpf_numa \
+	reuseport_dualstack \
 	rxtimestamp \
 	sctp_hello \
 	skf_net_off \
@@ -169,10 +177,6 @@ TEST_GEN_PROGS := \
 	ipv6_fragmentation \
 	proc_net_pktgen \
 	reuseaddr_conflict \
-	reuseport_bpf \
-	reuseport_bpf_cpu \
-	reuseport_bpf_numa \
-	reuseport_dualstack \
 	sk_bind_sendto_listen \
 	sk_connect_zero_addr \
 	sk_so_peek_off \
diff --git a/tools/testing/selftests/net/reuseport_bpf.sh b/tools/testing/selftests/net/reuseport_bpf.sh
new file mode 100755
index 000000000000..75014a5462a1
--- /dev/null
+++ b/tools/testing/selftests/net/reuseport_bpf.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+./in_netns.sh ./reuseport_bpf
diff --git a/tools/testing/selftests/net/reuseport_bpf_cpu.sh b/tools/testing/selftests/net/reuseport_bpf_cpu.sh
new file mode 100755
index 000000000000..243dc5bee014
--- /dev/null
+++ b/tools/testing/selftests/net/reuseport_bpf_cpu.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+./in_netns.sh ./reuseport_bpf_cpu
diff --git a/tools/testing/selftests/net/reuseport_bpf_numa.sh b/tools/testing/selftests/net/reuseport_bpf_numa.sh
new file mode 100755
index 000000000000..eccab95a3202
--- /dev/null
+++ b/tools/testing/selftests/net/reuseport_bpf_numa.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+./in_netns.sh ./reuseport_bpf_numa
diff --git a/tools/testing/selftests/net/reuseport_dualstack.sh b/tools/testing/selftests/net/reuseport_dualstack.sh
new file mode 100755
index 000000000000..82cc8e345a83
--- /dev/null
+++ b/tools/testing/selftests/net/reuseport_dualstack.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+./in_netns.sh ./reuseport_dualstack
-- 
2.43.0