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Please update the commit log:

'''
This patch adds a selftest for userpsace PM to remove id 0 subflow. Use
userspace_pm_add_sf() to add a subflow, and pass initial ip address to
userspace_pm_rm_sf() to remove id 0 subflow.

When closing the initial subflow in __mptcp_close_ssk(), dispose_it is
false, then tcp_disconnect is invoked. This will send a MP_RST to close
a subflow on the peer too. So chk_rst_nr() is added in this test, and
chk_all_subflows after closing the initial subflow is '1 1', not '2 1'.
'''

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 .../testing/selftests/net/mptcp/mptcp_join.sh | 33 +------------------
 1 file changed, 1 insertion(+), 32 deletions(-)

This patch adds a new helper chk_subflows_total(), in it use the newly
added counter mptcpi_subflows_total to get the "correct" amount of
subflows, including the initial one. To be compatible with old 'ss'
version without this counter, get the total subflows using this 'ss'
command:

ss -ti | grep -c tcp-ulp-mptcp.

Note:

This patch should be inserted between the commit
        mptcp: add mptcpi_subflows_total counter
and the commit
        selftests: mptcp: add evts_get_info helper

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 .../testing/selftests/net/mptcp/mptcp_join.sh | 37 ++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index XXXXXXX..XXXXXXX 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -XXX,XX +XXX,XX @@ chk_mptcp_info()
 	local cnt2
 	local dump_stats
 
-	print_check "mptcp_info ${info1:0:8}=$exp1:$exp2"
+	print_check "mptcp_info ${info1:0:15}=$exp1:$exp2"
 
 	cnt1=$(ss -N $ns1 -inmHM | mptcp_lib_get_info_value "$info1" "$info1")
 	cnt2=$(ss -N $ns2 -inmHM | mptcp_lib_get_info_value "$info2" "$info2")
@@ -XXX,XX +XXX,XX @@ chk_mptcp_info()
 	fi
 }
 
+# $1: subflows in ns1 ; $2: subflows in ns2
+# number of all subflows, including the initial subflow.
+chk_subflows_total()
+{
+	local cnt1
+	local cnt2
+	local info="subflows_total"
+
+	if [ $(ss -N $ns1 -inmHM | mptcp_lib_get_info_value $info $info) ]; then
+		chk_mptcp_info $info $1 $info $2
+		return
+	fi
+
+	print_check "$info $1:$2"
+
+	cnt1=$(ss -N $ns1 -ti | grep -c tcp-ulp-mptcp)
+	cnt2=$(ss -N $ns2 -ti | grep -c tcp-ulp-mptcp)
+
+	if [ "$1" != "$cnt1" ] || [ "$2" != "$cnt2" ]; then
+		fail_test "got subflows $cnt1:$cnt2 expected $1:$2"
+		dump_stats=1
+	else
+		print_ok
+	fi
+
+	if [ "$dump_stats" = 1 ]; then
+		ss -N $ns1 -ti
+		ss -N $ns2 -ti
+	fi
+}
+
 chk_link_usage()
 {
 	local ns=$1
@@ -XXX,XX +XXX,XX @@ userspace_tests()
 		chk_join_nr 1 1 1
 		chk_add_nr 1 1
 		chk_mptcp_info subflows 1 subflows 1
+		chk_subflows_total 2 2
 		chk_mptcp_info add_addr_signal 1 add_addr_accepted 1
 		userspace_pm_rm_addr $ns1 10
 		userspace_pm_rm_sf $ns1 "::ffff:10.0.2.1" $SUB_ESTABLISHED
 		chk_rm_nr 1 1 invert
 		chk_mptcp_info subflows 0 subflows 0
+		chk_subflows_total 1 1
 		mptcp_lib_evts_kill
 		wait $tests_pid
 	fi
@@ -XXX,XX +XXX,XX @@ userspace_tests()
 		userspace_pm_add_sf $ns2 10.0.3.2 20
 		chk_join_nr 1 1 1
 		chk_mptcp_info subflows 1 subflows 1
+		chk_subflows_total 2 2
 		userspace_pm_rm_addr $ns2 20
 		userspace_pm_rm_sf $ns2 10.0.3.2 $SUB_ESTABLISHED
 		chk_rm_nr 1 1
 		chk_mptcp_info subflows 0 subflows 0
+		chk_subflows_total 1 1
 		mptcp_lib_evts_kill
 		wait $tests_pid
 	fi
-- 
2.35.3

This patch adds a selftest for userpsace PM to remove id 0 subflow.

A new helper userspace_pm_rm_id_0_subflow_ns2() is added, in it use

./pm_nl_ctl dsf lip 10.0.1.2 lport $sp \
			rip 10.0.1.1 rport $dp token $tk

to remove id 0 subflow.

Add a new helper +chk_subflows(), in it use 'ss' command

ss -ti | grep -c tcp-ulp-mptcp

to get the "correct" amount of subflows, including the initial
subflow.

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 .../testing/selftests/net/mptcp/mptcp_join.sh | 58 +++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index XXXXXXX..XXXXXXX 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -XXX,XX +XXX,XX @@ userspace_pm_rm_sf_addr_ns2()
 	wait_rm_sf $ns2 1
 }
 
+userspace_pm_rm_id_0_subflow_ns2()
+{
+	local tk da dp sp
+
+	tk=$(evts_get_info token "$evts_ns2")
+	da=$(evts_get_info daddr4 "$evts_ns2")
+	dp=$(evts_get_info dport "$evts_ns2")
+	sp=$(evts_get_info sport "$evts_ns2")
+	ip netns exec $ns2 ./pm_nl_ctl dsf lip 10.0.1.2 lport $sp \
+			rip $da rport $dp token $tk
+	wait_rm_sf $ns2 1
+}
+
+# $1: subflows in ns1 ; $2: subflows in ns2
+chk_subflows()
+{
+	local cnt1
+	local cnt2
+
+	print_check "subflows $1:$2"
+
+	cnt1=$(ss -N $ns1 -ti | grep -c tcp-ulp-mptcp)
+	cnt2=$(ss -N $ns2 -ti | grep -c tcp-ulp-mptcp)
+
+	if [ "$1" != "$cnt1" ] || [ "$2" != "$cnt2" ]; then
+		fail_test "got subflows $cnt1:$cnt2 expected $1:$2"
+		dump_stats=1
+	else
+		print_ok
+	fi
+
+	if [ "$dump_stats" = 1 ]; then
+		ss -N $ns1 -ti
+		ss -N $ns2 -ti
+	fi
+}
+
 userspace_tests()
 {
 	# userspace pm type prevents add_addr
@@ -XXX,XX +XXX,XX @@ userspace_tests()
 		kill_events_pids
 		wait $tests_pid
 	fi
+
+	# userspace pm remove id 0 subflow
+	if reset_with_events "userspace pm remove id 0 subflow" &&
+	   continue_if mptcp_lib_has_file '/proc/sys/net/mptcp/pm_type'; then
+		set_userspace_pm $ns2
+		pm_nl_set_limits $ns1 0 1
+		speed=10 \
+			run_tests $ns1 $ns2 10.0.1.1 &
+		local tests_pid=$!
+		wait_mpj $ns2
+		userspace_pm_add_sf 10.0.3.2 20
+		chk_join_nr 1 1 1
+		chk_mptcp_info subflows 1 subflows 1
+		chk_subflows 2 2
+		userspace_pm_rm_id_0_subflow_ns2
+		chk_rm_nr 0 1
+		chk_mptcp_info subflows 1 subflows 1
+		chk_subflows 1 1
+		kill_events_pids
+		wait $tests_pid
+	fi
 }
 
 endpoint_tests()
-- 
2.35.3

This patch drops id 0 limitation in mptcp_nl_cmd_sf_create() to allow
creating additional subflows with the local addr ID 0.

There is no reason not to allow additional subflows from this local
address: we should be able to create new subflows from the initial
endpoint. This limitation was breaking fullmesh support from userspace.

Fixes: 702c2f646d42 ("mptcp: netlink: allow userspace-driven subflow establishment")
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/391
Suggested-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 net/mptcp/pm_userspace.c | 6 ------
 1 file changed, 6 deletions(-)

This patch adds a selftest to create id 0 subflow. Using

./pm_nl_ctl csf lip 10.0.3.2 lid 0 \
                        rip $da rport $dp token $tk

command to create id 0 subflow.

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 .../testing/selftests/net/mptcp/mptcp_join.sh | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

This patch adds the ability to send RM_ADDR for local ID 0. Put id 0
into a removing list, pass it to mptcp_pm_remove_addr() to remove id
0 address.

There is no reason not to allow the userspace to remove the initial
address (ID 0). This special case was not taken into account not
letting the userspace to delete all addresses as announced.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/379
Fixes: d9a4594edabf ("mptcp: netlink: Add MPTCP_PM_CMD_REMOVE")
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 net/mptcp/pm_userspace.c | 42 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 39 insertions(+), 3 deletions(-)

diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index XXXXXXX..XXXXXXX 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -XXX,XX +XXX,XX @@ int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info)
 
 	if (!mptcp_pm_is_userspace(msk)) {
 		GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
-		goto remove_err;
+		goto out;
+	}
+
+	if (id_val == 0) {
+		struct mptcp_rm_list list = { .nr = 0 };
+		struct mptcp_subflow_context *subflow;
+		bool has_id_0 = false;
+
+		if (!READ_ONCE(msk->first)) {
+			GENL_SET_ERR_MSG(info, "no subflow in conn_list");
+			goto out;
+		}
+
+		spin_lock_bh(&msk->pm.lock);
+		mptcp_for_each_subflow(msk, subflow) {
+			if (subflow->remote_id == 0) {
+				has_id_0 = true;
+				break;
+			}
+		}
+		spin_unlock_bh(&msk->pm.lock);
+
+		if (!has_id_0) {
+			GENL_SET_ERR_MSG(info, "address with id 0 not found");
+			goto out;
+		}
+
+		list.ids[list.nr++] = 0;
+
+		lock_sock((struct sock *)msk);
+		spin_lock_bh(&msk->pm.lock);
+		mptcp_pm_remove_addr(msk, &list);
+		spin_unlock_bh(&msk->pm.lock);
+		release_sock((struct sock *)msk);
+
+		err = 0;
+		goto out;
 	}
 
 	lock_sock((struct sock *)msk);
@@ -XXX,XX +XXX,XX @@ int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info)
 	if (!match) {
 		GENL_SET_ERR_MSG(info, "address with specified id not found");
 		release_sock((struct sock *)msk);
-		goto remove_err;
+		goto out;
 	}
 
 	list_move(&match->list, &free_list);
@@ -XXX,XX +XXX,XX @@ int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info)
 	}
 
 	err = 0;
- remove_err:
+out:
 	sock_put((struct sock *)msk);
 	return err;
 }
-- 
2.35.3

This patch adds a selftest for userpsace PM to remove id 0 address.

A new helper userspace_pm_rm_id_0_address_ns2() is added, in it use

./pm_nl_ctl rem token $tk id 0

to remove id 0 address.

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 .../testing/selftests/net/mptcp/mptcp_join.sh | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)