selftests: mptcp: drop sflags parameter

run_tests() accepts too many optional parameters. Before this modification,
it was required to set all of then when only the last one had to be
changed. That's not clear to see all these 0 and it makes the maintenance
harder:

      run_tests $ns1 $ns2 10.0.1.1 1 2 3 slow

Instead, the parameter can be set as an env var with a limited scope:

      foo=1 bar=2 next=3 \
            run_tests $ns1 $ns2 10.0.1.1 slow

This patch switches to key/value "sflags=*" instead of positional parameter
sflags of do_transfer() and run_tests().

Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <martineau@kernel.org>
Link: https://lore.kernel.org/r/20230623-send-net-next-20230623-v1-6-a883213c8ba9@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: geliangtang

tools/testing/selftests/net/mptcp/mptcp_join.sh

@@ -53,6 +53,7 @@ export FAILING_LINKS=""
 export test_linkfail=0
 export addr_nr_ns1=0
 export addr_nr_ns2=0
+export sflags=""
 
 # generated using "nfbpf_compile '(ip && (ip[54] & 0xf0) == 0x30) ||
 #				  (ip6 && (ip6[74] & 0xf0) == 0x30)'"
@@ -829,7 +830,6 @@ do_transfer()
 	local srv_proto="$4"
 	local connect_addr="$5"
 	local speed="$6"
-	local sflags="${7}"
 
 	local port=$((10000 + TEST_COUNT - 1))
 	local cappid
@@ -1147,7 +1147,6 @@ run_tests()
 	local connector_ns="$2"
 	local connect_addr="$3"
 	local speed="${4:-fast}"
-	local sflags="${5:-""}"
 
 	local size
 
@@ -1191,8 +1190,7 @@ run_tests()
 		make_file "$sinfail" "server" $size
 	fi
 
-	do_transfer ${listener_ns} ${connector_ns} MPTCP MPTCP ${connect_addr} \
-		${speed} ${sflags}
+	do_transfer ${listener_ns} ${connector_ns} MPTCP MPTCP ${connect_addr} ${speed}
 }
 
 dump_stats()
@@ -2687,7 +2685,8 @@ backup_tests()
 		pm_nl_set_limits $ns1 0 1
 		pm_nl_set_limits $ns2 0 1
 		pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow,backup
-		run_tests $ns1 $ns2 10.0.1.1 slow nobackup
+		sflags=nobackup \
+			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 1 1 1
 		chk_prio_nr 0 1
 	fi
@@ -2698,7 +2697,8 @@ backup_tests()
 		pm_nl_set_limits $ns1 0 1
 		pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
 		pm_nl_set_limits $ns2 1 1
-		run_tests $ns1 $ns2 10.0.1.1 slow backup
+		sflags=backup \
+			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 1 1 1
 		chk_add_nr 1 1
 		chk_prio_nr 1 1
@@ -2710,7 +2710,8 @@ backup_tests()
 		pm_nl_set_limits $ns1 0 1
 		pm_nl_add_endpoint $ns1 10.0.2.1 flags signal port 10100
 		pm_nl_set_limits $ns2 1 1
-		run_tests $ns1 $ns2 10.0.1.1 slow backup
+		sflags=backup \
+			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 1 1 1
 		chk_add_nr 1 1
 		chk_prio_nr 1 1
@@ -2736,7 +2737,8 @@ backup_tests()
 	if reset "mpc switch to backup" &&
 	   continue_if mptcp_lib_kallsyms_doesnt_have "mptcp_subflow_send_ack$"; then
 		pm_nl_add_endpoint $ns2 10.0.1.2 flags subflow
-		run_tests $ns1 $ns2 10.0.1.1 slow backup
+		sflags=backup \
+			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 0 0 0
 		chk_prio_nr 0 1
 	fi
@@ -2745,7 +2747,8 @@ backup_tests()
 	   continue_if mptcp_lib_kallsyms_doesnt_have "mptcp_subflow_send_ack$"; then
 		pm_nl_add_endpoint $ns1 10.0.1.1 flags subflow
 		pm_nl_add_endpoint $ns2 10.0.1.2 flags subflow
-		run_tests $ns1 $ns2 10.0.1.1 slow backup
+		sflags=backup \
+			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 0 0 0
 		chk_prio_nr 1 1
 	fi
@@ -3120,8 +3123,8 @@ fullmesh_tests()
 		pm_nl_set_limits $ns1 4 4
 		pm_nl_add_endpoint $ns1 10.0.2.1 flags subflow
 		pm_nl_set_limits $ns2 4 4
-		addr_nr_ns2=1 \
-			run_tests $ns1 $ns2 10.0.1.1 slow fullmesh
+		addr_nr_ns2=1 sflags=fullmesh \
+			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 2 2 2
 		chk_rm_nr 0 1
 	fi
@@ -3132,8 +3135,8 @@ fullmesh_tests()
 		pm_nl_set_limits $ns1 4 4
 		pm_nl_add_endpoint $ns1 10.0.2.1 flags subflow,fullmesh
 		pm_nl_set_limits $ns2 4 4
-		addr_nr_ns2=fullmesh_1 \
-			run_tests $ns1 $ns2 10.0.1.1 slow nofullmesh
+		addr_nr_ns2=fullmesh_1 sflags=nofullmesh \
+			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 2 2 2
 		chk_rm_nr 0 1
 	fi
@@ -3144,8 +3147,8 @@ fullmesh_tests()
 		pm_nl_set_limits $ns1 4 4
 		pm_nl_add_endpoint $ns1 10.0.2.1 flags subflow
 		pm_nl_set_limits $ns2 4 4
-		addr_nr_ns2=1 run_tests \
-			$ns1 $ns2 10.0.1.1 slow backup,fullmesh
+		addr_nr_ns2=1 sflags=backup,fullmesh \
+			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 2 2 2
 		chk_prio_nr 0 1
 		chk_rm_nr 0 1
@@ -3157,7 +3160,8 @@ fullmesh_tests()
 		pm_nl_set_limits $ns1 4 4
 		pm_nl_set_limits $ns2 4 4
 		pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow,backup,fullmesh
-		run_tests $ns1 $ns2 10.0.1.1 slow nobackup,nofullmesh
+		sflags=nobackup,nofullmesh \
+			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 2 2 2
 		chk_prio_nr 0 1
 		chk_rm_nr 0 1
@@ -3332,7 +3336,8 @@ userspace_tests()
 		pm_nl_set_limits $ns1 1 1
 		pm_nl_set_limits $ns2 1 1
 		pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
-		run_tests $ns1 $ns2 10.0.1.1 slow backup
+		sflags=backup \
+			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 1 1 0
 		chk_prio_nr 0 0
 	fi