From: Geliang Tang <tanggeliang@kylinos.cn>

This patch adds a link of mptcp pm_nl_ctl tool into bpf selftests, and
updates Makefile to compile it.

This is useful to run mptcp bpf selftests on a system with an old version
of IPRoite2 is installed. When 'ip mptcp' is not supported, this tool
pm_nl_ctl can be used instead.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 tools/testing/selftests/bpf/Makefile          | 2 +-
 tools/testing/selftests/bpf/mptcp_pm_nl_ctl.c | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)
 create mode 120000 tools/testing/selftests/bpf/mptcp_pm_nl_ctl.c

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index b90c718218ae..6fe242275e14 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -131,7 +131,7 @@ TEST_GEN_PROGS_EXTENDED = test_sock_addr test_skb_cgroup_id_user \
 	flow_dissector_load test_flow_dissector test_tcp_check_syncookie_user \
 	test_lirc_mode2_user xdping test_cpp runqslower bench bpf_testmod.ko \
 	xskxceiver xdp_redirect_multi xdp_synproxy veristat xdp_hw_metadata \
-	xdp_features bpf_test_no_cfi.ko
+	xdp_features bpf_test_no_cfi.ko mptcp_pm_nl_ctl
 
 TEST_GEN_FILES += liburandom_read.so urandom_read sign-file uprobe_multi
 
diff --git a/tools/testing/selftests/bpf/mptcp_pm_nl_ctl.c b/tools/testing/selftests/bpf/mptcp_pm_nl_ctl.c
new file mode 120000
index 000000000000..5a08c255b278
--- /dev/null
+++ b/tools/testing/selftests/bpf/mptcp_pm_nl_ctl.c
@@ -0,0 +1 @@
+../net/mptcp/pm_nl_ctl.c
\ No newline at end of file
-- 
2.43.0