Commit 53705ddfa184 for kernel

commit 53705ddfa18408f8e1f064331b6387509fa19f7f
Author: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Date:   Tue May 5 17:00:59 2026 +0200

    selftests: mptcp: pm: restrict 'unknown' check to pm_nl_ctl

    When pm_netlink.sh is executed with '-i', 'ip mptcp' is used instead of
    'pm_nl_ctl'. IPRoute2 doesn't support the 'unknown' flag, which has only
    been added to 'pm_nl_ctl' for this specific check: to ensure that the
    kernel ignores such unsupported flag.

    No reason to add this flag to 'ip mptcp'. Then, this check should be
    skipped when 'ip mptcp' is used.

    Fixes: 0cef6fcac24d ("selftests: mptcp: ip_mptcp option for more scripts")
    Cc: stable@vger.kernel.org
    Reviewed-by: Mat Martineau <martineau@kernel.org>
    Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
    Link: https://patch.msgid.link/20260505-net-mptcp-pm-fixes-7-1-rc3-v1-11-fca8091060a4@kernel.org
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/mptcp/pm_netlink.sh b/tools/testing/selftests/net/mptcp/pm_netlink.sh
index b69f30fcb91e..04594dfc22b1 100755
--- a/tools/testing/selftests/net/mptcp/pm_netlink.sh
+++ b/tools/testing/selftests/net/mptcp/pm_netlink.sh
@@ -194,9 +194,13 @@ check "show_endpoints" \
 flush_endpoint
 check "show_endpoints" "" "flush addrs"

-add_endpoint 10.0.1.1 flags unknown
-check "show_endpoints" "$(format_endpoints "1,10.0.1.1")" "ignore unknown flags"
-flush_endpoint
+# "unknown" flag is only supported by pm_nl_ctl
+if ! mptcp_lib_is_ip_mptcp; then
+	add_endpoint 10.0.1.1 flags unknown
+	check "show_endpoints" "$(format_endpoints "1,10.0.1.1")" \
+	      "ignore unknown flags"
+	flush_endpoint
+fi

 set_limits 9 1 2>/dev/null
 check "get_limits" "${default_limits}" "rcv addrs above hard limit"