[Devel] [PATCH RHEL10 COMMIT] selftests: net: run reuseport tests in netns to avoid port conflicts

[Konstantin Khorenko]

The commit is pushed to "branch-rh10-6.12.0-55.13.1.3.x.vz10-ovz" and will appear at git at bitbucket.org:openvz/vzkernel.git
after rh10-6.12.0-55.13.1.3.28.vz10
------>
commit 6fddea051a204caee19a955ea3f490a7e805e959
Author: Konstantin Khorenko <khorenko at virtuozzo.com>
Date:   Tue Dec 23 22:22:47 2025 +0000

    selftests: net: run reuseport tests in netns to avoid port conflicts
    
    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.
    
    This approach is consistent with upstream solution used in
    fc49b804967e5 ("selftests: netfilter: run conntrack_dump_flush in netns")
    and follows the pattern already used by reuseport_addr_any.sh test.
    
    https://virtuozzo.atlassian.net/browse/VSTOR-120995
    
    Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
    Reviewed-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
    
    Feature: fix selftests
---
 tools/testing/selftests/net/Makefile               | 5 +++--
 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, 19 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index 744c8827650c3..3ecd2c34b3d1f 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -11,6 +11,7 @@ TEST_PROGS := run_netsocktests run_afpackettests test_bpf.sh netdevice.sh \
 TEST_PROGS += fib_tests.sh fib-onlink-tests.sh pmtu.sh udpgso.sh ip_defrag.sh
 TEST_PROGS += udpgso_bench.sh fib_rule_tests.sh msg_zerocopy.sh psock_snd.sh
 TEST_PROGS += udpgro_bench.sh udpgro.sh test_vxlan_under_vrf.sh reuseport_addr_any.sh
+TEST_PROGS += reuseport_bpf.sh reuseport_bpf_cpu.sh reuseport_bpf_numa.sh reuseport_dualstack.sh
 TEST_PROGS += test_vxlan_fdb_changelink.sh so_txtime.sh ipv6_flowlabel.sh
 TEST_PROGS += tcp_fastopen_backup_key.sh fcnal-test.sh l2tp.sh traceroute.sh
 TEST_PROGS += fin_ack_lat.sh fib_nexthop_multiprefix.sh fib_nexthops.sh fib_nexthop_nongw.sh
@@ -69,8 +70,8 @@ TEST_GEN_FILES += hwtstamp_config rxtimestamp timestamping txtimestamp
 TEST_GEN_FILES += ipsec
 TEST_GEN_FILES += ioam6_parser
 TEST_GEN_FILES += gro
-TEST_GEN_PROGS = reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa
-TEST_GEN_PROGS += reuseport_dualstack reuseaddr_conflict tls tun tap epoll_busy_poll
+TEST_GEN_FILES += reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa reuseport_dualstack
+TEST_GEN_PROGS = reuseaddr_conflict tls tun tap epoll_busy_poll
 TEST_GEN_FILES += toeplitz
 TEST_GEN_FILES += cmsg_sender
 TEST_GEN_FILES += stress_reuseport_listen
diff --git a/tools/testing/selftests/net/reuseport_bpf.sh b/tools/testing/selftests/net/reuseport_bpf.sh
new file mode 100755
index 0000000000000..75014a5462a15
--- /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 0000000000000..243dc5bee0142
--- /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 0000000000000..eccab95a32029
--- /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 0000000000000..82cc8e345a835
--- /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