diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 63580a5810bf1..23f8e22540644 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -67,6 +67,10 @@ unset join_fail_nr
 unset join_rst_nr
 unset join_infi_nr
 unset join_corrupted_pkts
+unset join_syn_tx
+unset join_create_err
+unset join_bind_err
+unset join_connect_err
 
 # generated using "nfbpf_compile '(ip && (ip[54] & 0xf0) == 0x30) ||
 #				  (ip6 && (ip6[74] & 0xf0) == 0x30)'"
@@ -1336,6 +1340,54 @@ chk_infi_nr()
 	fi
 }
 
+chk_join_tx_nr()
+{
+	local syn_tx=${join_syn_tx:-0}
+	local create=${join_create_err:-0}
+	local bind=${join_bind_err:-0}
+	local connect=${join_connect_err:-0}
+	local rc=${KSFT_PASS}
+	local count
+
+	count=$(mptcp_lib_get_counter ${ns2} "MPTcpExtMPJoinSynTx")
+	if [ -z "$count" ]; then
+		rc=${KSFT_SKIP}
+	elif [ "$count" != "$syn_tx" ]; then
+		rc=${KSFT_FAIL}
+		print_check "syn tx"
+		fail_test "got $count JOIN[s] syn tx expected $syn_tx"
+	fi
+
+	count=$(mptcp_lib_get_counter ${ns2} "MPTcpExtMPJoinSynTxCreatSkErr")
+	if [ -z "$count" ]; then
+		rc=${KSFT_SKIP}
+	elif [ "$count" != "$create" ]; then
+		rc=${KSFT_FAIL}
+		print_check "syn tx create socket error"
+		fail_test "got $count JOIN[s] syn tx create socket error expected $create"
+	fi
+
+	count=$(mptcp_lib_get_counter ${ns2} "MPTcpExtMPJoinSynTxBindErr")
+	if [ -z "$count" ]; then
+		rc=${KSFT_SKIP}
+	elif [ "$count" != "$bind" ]; then
+		rc=${KSFT_FAIL}
+		print_check "syn tx bind error"
+		fail_test "got $count JOIN[s] syn tx bind error expected $bind"
+	fi
+
+	count=$(mptcp_lib_get_counter ${ns2} "MPTcpExtMPJoinSynTxConnectErr")
+	if [ -z "$count" ]; then
+		rc=${KSFT_SKIP}
+	elif [ "$count" != "$connect" ]; then
+		rc=${KSFT_FAIL}
+		print_check "syn tx connect error"
+		fail_test "got $count JOIN[s] syn tx connect error expected $connect"
+	fi
+
+	print_results "join Tx" ${rc}
+}
+
 chk_join_nr()
 {
 	local syn_nr=$1
@@ -1390,6 +1442,9 @@ chk_join_nr()
 
 	print_results "join Rx" ${rc}
 
+	join_syn_tx="${join_syn_tx:-${syn_nr}}" \
+		chk_join_tx_nr
+
 	if $validate_checksum; then
 		chk_csum_nr $csum_ns1 $csum_ns2
 		chk_fail_nr $fail_nr $fail_nr
@@ -1930,9 +1985,11 @@ subflows_error_tests()
 		pm_nl_set_limits $ns1 0 1
 		pm_nl_set_limits $ns2 0 1
 		pm_nl_add_endpoint $ns2 10.0.1.2 flags subflow
+		pm_nl_add_endpoint $ns2 10.0.12.2 flags subflow
 		speed=slow \
 			run_tests $ns1 $ns2 10.0.1.1
-		chk_join_nr 0 0 0
+		join_bind_err=1 \
+			chk_join_nr 0 0 0
 	fi
 
 	# multiple subflows, with subflow creation error
@@ -1944,7 +2001,8 @@ subflows_error_tests()
 		pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow
 		speed=slow \
 			run_tests $ns1 $ns2 10.0.1.1
-		chk_join_nr 1 1 1
+		join_syn_tx=2 \
+			chk_join_nr 1 1 1
 	fi
 
 	# multiple subflows, with subflow timeout on MPJ
@@ -1956,7 +2014,8 @@ subflows_error_tests()
 		pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow
 		speed=slow \
 			run_tests $ns1 $ns2 10.0.1.1
-		chk_join_nr 1 1 1
+		join_syn_tx=2 \
+			chk_join_nr 1 1 1
 	fi
 
 	# multiple subflows, check that the endpoint corresponding to
@@ -1977,7 +2036,8 @@ subflows_error_tests()
 
 		# additional subflow could be created only if the PM select
 		# the later endpoint, skipping the already used one
-		chk_join_nr 1 1 1
+		join_syn_tx=2 \
+			chk_join_nr 1 1 1
 	fi
 }
 
@@ -2063,7 +2123,8 @@ signal_address_tests()
 		pm_nl_add_endpoint $ns1 10.0.14.1 flags signal
 		pm_nl_set_limits $ns2 3 3
 		run_tests $ns1 $ns2 10.0.1.1
-		chk_join_nr 1 1 1
+		join_syn_tx=3 \
+			chk_join_nr 1 1 1
 		chk_add_nr 3 3
 	fi
 
@@ -2231,7 +2292,8 @@ add_addr_timeout_tests()
 		pm_nl_set_limits $ns2 2 2
 		speed=10 \
 			run_tests $ns1 $ns2 10.0.1.1
-		chk_join_nr 1 1 1
+		join_syn_tx=2 \
+			chk_join_nr 1 1 1
 		chk_add_nr 8 0
 	fi
 }
@@ -2331,7 +2393,8 @@ remove_tests()
 		pm_nl_set_limits $ns2 2 2
 		addr_nr_ns1=-3 speed=10 \
 			run_tests $ns1 $ns2 10.0.1.1
-		chk_join_nr 1 1 1
+		join_syn_tx=2 join_connect_err=1 \
+			chk_join_nr 1 1 1
 		chk_add_nr 3 3
 		chk_rm_nr 3 1 invert
 		chk_rst_nr 0 0
@@ -2396,7 +2459,8 @@ remove_tests()
 		pm_nl_set_limits $ns2 3 3
 		addr_nr_ns1=-8 speed=slow \
 			run_tests $ns1 $ns2 10.0.1.1
-		chk_join_nr 1 1 1
+		join_syn_tx=3 \
+			chk_join_nr 1 1 1
 		chk_add_nr 3 3
 		chk_rm_nr 3 1 invert
 		chk_rst_nr 0 0
@@ -3703,7 +3767,8 @@ endpoint_tests()
 		chk_evt_nr ns2 MPTCP_LIB_EVENT_SUB_ESTABLISHED 6
 		chk_evt_nr ns2 MPTCP_LIB_EVENT_SUB_CLOSED 5 # one has been closed before estab
 
-		chk_join_nr 6 6 6
+		join_syn_tx=7 \
+			chk_join_nr 6 6 6
 		chk_rm_nr 4 4
 	fi
 
@@ -3775,7 +3840,8 @@ endpoint_tests()
 		chk_evt_nr ns2 MPTCP_LIB_EVENT_SUB_ESTABLISHED 5
 		chk_evt_nr ns2 MPTCP_LIB_EVENT_SUB_CLOSED 3
 
-		chk_join_nr 5 5 5
+		join_connect_err=1 \
+			chk_join_nr 5 5 5
 		chk_add_nr 6 6
 		chk_rm_nr 4 3 invert
 	fi
@@ -3806,7 +3872,8 @@ endpoint_tests()
 		wait_mpj $ns2
 		mptcp_lib_kill_wait $tests_pid
 
-		chk_join_nr 2 2 2
+		join_syn_tx=3 join_connect_err=1 \
+			chk_join_nr 2 2 2
 		chk_add_nr 2 2
 		chk_rm_nr 1 0 invert
 	fi