diff --git a/tools/testing/selftests/drivers/net/hw/ethtool.sh b/tools/testing/selftests/drivers/net/hw/ethtool.sh
index bb12d5d709493..fa6953de6b6dd 100755
--- a/tools/testing/selftests/drivers/net/hw/ethtool.sh
+++ b/tools/testing/selftests/drivers/net/hw/ethtool.sh
@@ -65,9 +65,8 @@ same_speeds_autoneg_off()
 		setup_wait_dev_with_timeout $h1
 		setup_wait_dev_with_timeout $h2
 		ping_do $h1 192.0.2.2
-		check_err $? "speed $speed autoneg off"
-		log_test "force of same speed autoneg off"
-		log_info "speed = $speed"
+		check_err $? "ping with speed $speed autoneg off"
+		log_test "force speed $speed on both ends"
 	done
 
 	ethtool -s $h2 autoneg on
@@ -112,9 +111,8 @@ combination_of_neg_on_and_off()
 		setup_wait_dev_with_timeout $h1
 		setup_wait_dev_with_timeout $h2
 		ping_do $h1 192.0.2.2
-		check_err $? "h1-speed=$speed autoneg off, h2 autoneg on"
-		log_test "one side with autoneg off and another with autoneg on"
-		log_info "force speed = $speed"
+		check_err $? "ping with h1-speed=$speed autoneg off, h2 autoneg on"
+		log_test "force speed $speed vs. autoneg"
 	done
 
 	ethtool -s $h1 autoneg on
@@ -207,10 +205,9 @@ advertise_subset_of_speeds()
 		setup_wait_dev_with_timeout $h1
 		setup_wait_dev_with_timeout $h2
 		ping_do $h1 192.0.2.2
-		check_err $? "h1=$speed_1_to_advertise, h2=$speed_2_to_advertise ($speed_value)"
+		check_err $? "ping with h1=$speed_1_to_advertise, h2=$speed_2_to_advertise ($speed_value)"
 
-		log_test "advertise subset of speeds"
-		log_info "h1=$speed_1_to_advertise, h2=$speed_2_to_advertise"
+		log_test "advertise $speed_1_to_advertise vs. $speed_2_to_advertise"
 	done
 
 	ethtool -s $h2 autoneg on
diff --git a/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh b/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh
index e2a1c10d35035..8f60c1685ad4b 100755
--- a/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh
+++ b/tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh
@@ -44,6 +44,7 @@ bucket_test()
 	# Mausezahn does not include FCS bytes in its length - but the
 	# histogram counters do
 	len=$((len - ETH_FCS_LEN))
+	len=$((len > 0 ? len : 0))
 
 	before=$(ethtool --json -S $iface --groups rmon | \
 		jq -r ".[0].rmon[\"${set}-pktsNtoM\"][$bucket].val")
diff --git a/tools/testing/selftests/drivers/net/hw/hw_stats_l3.sh b/tools/testing/selftests/drivers/net/hw/hw_stats_l3.sh
index 7dfc50366c992..67fafefc80bea 100755
--- a/tools/testing/selftests/drivers/net/hw/hw_stats_l3.sh
+++ b/tools/testing/selftests/drivers/net/hw/hw_stats_l3.sh
@@ -50,6 +50,7 @@ ALL_TESTS="
 NUM_NETIFS=4
 lib_dir=$(dirname "$0")
 source "$lib_dir"/../../../net/forwarding/lib.sh
+source "$lib_dir"/../../../net/forwarding/tc_common.sh
 
 h1_create()
 {
diff --git a/tools/testing/selftests/drivers/net/hw/hw_stats_l3_gre.sh b/tools/testing/selftests/drivers/net/hw/hw_stats_l3_gre.sh
index ab8d04855af5c..a94d92e1abce6 100755
--- a/tools/testing/selftests/drivers/net/hw/hw_stats_l3_gre.sh
+++ b/tools/testing/selftests/drivers/net/hw/hw_stats_l3_gre.sh
@@ -15,6 +15,7 @@ NUM_NETIFS=6
 lib_dir=$(dirname "$0")
 source "$lib_dir"/../../../net/forwarding/lib.sh
 source "$lib_dir"/../../../net/forwarding/ipip_lib.sh
+source "$lib_dir"/../../../net/forwarding/tc_common.sh
 
 setup_prepare()
 {
diff --git a/tools/testing/selftests/drivers/net/mlxsw/ethtool_lanes.sh b/tools/testing/selftests/drivers/net/mlxsw/ethtool_lanes.sh
index 91891b9418d76..877cd6df94a10 100755
--- a/tools/testing/selftests/drivers/net/mlxsw/ethtool_lanes.sh
+++ b/tools/testing/selftests/drivers/net/mlxsw/ethtool_lanes.sh
@@ -24,8 +24,8 @@ setup_prepare()
 	busywait "$TIMEOUT" wait_for_port_up ethtool $swp2
 	check_err $? "ports did not come up"
 
-	local lanes_exist=$(ethtool $swp1 | grep 'Lanes:')
-	if [[ -z $lanes_exist ]]; then
+	busywait $TIMEOUT sh -c "ethtool $swp1 | grep -q Lanes:"
+	if [[ $? -ne 0 ]]; then
 		log_test "SKIP: driver does not support lanes setting"
 		exit 1
 	fi
@@ -122,8 +122,9 @@ autoneg()
 			ethtool_set $swp1 speed $max_speed lanes $lanes
 			ip link set dev $swp1 up
 			ip link set dev $swp2 up
-			busywait "$TIMEOUT" wait_for_port_up ethtool $swp2
-			check_err $? "ports did not come up"
+
+			busywait $TIMEOUT sh -c "ethtool $swp1 | grep -q Lanes:"
+			check_err $? "Lanes parameter is not presented on time"
 
 			check_lanes $swp1 $lanes $max_speed
 			log_test "$lanes lanes is autonegotiated"
@@ -160,8 +161,9 @@ autoneg_force_mode()
 			ethtool_set $swp2 speed $max_speed lanes $lanes autoneg off
 			ip link set dev $swp1 up
 			ip link set dev $swp2 up
-			busywait "$TIMEOUT" wait_for_port_up ethtool $swp2
-			check_err $? "ports did not come up"
+
+			busywait $TIMEOUT sh -c "ethtool $swp1 | grep -q Lanes:"
+			check_err $? "Lanes parameter is not presented on time"
 
 			check_lanes $swp1 $lanes $max_speed
 			log_test "Autoneg off, $lanes lanes detected during force mode"
diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
index 4103ed7afcde3..7913c6ee418d5 100644
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -95,27 +95,9 @@ source "$net_forwarding_dir/../lib.sh"
 # timeout in seconds
 slowwait()
 {
-	local timeout=$1; shift
-
-	local start_time="$(date -u +%s)"
-	while true
-	do
-		local out
-		out=$("$@")
-		local ret=$?
-		if ((!ret)); then
-			echo -n "$out"
-			return 0
-		fi
-
-		local current_time="$(date -u +%s)"
-		if ((current_time - start_time > timeout)); then
-			echo -n "$out"
-			return 1
-		fi
+	local timeout_sec=$1; shift
 
-		sleep 0.1
-	done
+	loopy_wait "sleep 0.1" "$((timeout_sec * 1000))" "$@"
 }
 
 ##############################################################################
@@ -291,11 +273,6 @@ if [[ "$REQUIRE_MTOOLS" = "yes" ]]; then
 	require_command mreceive
 fi
 
-if [[ ! -v NUM_NETIFS ]]; then
-	echo "SKIP: importer does not define \"NUM_NETIFS\""
-	exit $ksft_skip
-fi
-
 ##############################################################################
 # Command line options handling
 
@@ -314,6 +291,23 @@ done
 ##############################################################################
 # Network interfaces configuration
 
+if [[ ! -v NUM_NETIFS ]]; then
+	echo "SKIP: importer does not define \"NUM_NETIFS\""
+	exit $ksft_skip
+fi
+
+if (( NUM_NETIFS > ${#NETIFS[@]} )); then
+	echo "SKIP: Importer requires $NUM_NETIFS NETIFS, but only ${#NETIFS[@]} are defined (${NETIFS[@]})"
+	exit $ksft_skip
+fi
+
+for i in $(seq ${#NETIFS[@]}); do
+	if [[ ! ${NETIFS[p$i]} ]]; then
+		echo "SKIP: NETIFS[p$i] not given"
+		exit $ksft_skip
+	fi
+done
+
 create_netif_veth()
 {
 	local i
@@ -2144,6 +2138,8 @@ bail_on_lldpad()
 {
 	local reason1="$1"; shift
 	local reason2="$1"; shift
+	local caller=${FUNCNAME[1]}
+	local src=${BASH_SOURCE[1]}
 
 	if systemctl is-active --quiet lldpad; then
 
@@ -2164,7 +2160,8 @@ bail_on_lldpad()
 				an environment variable ALLOW_LLDPAD to a
 				non-empty string.
 			EOF
-			exit 1
+			log_test_skip $src:$caller
+			exit $EXIT_STATUS
 		else
 			return
 		fi
diff --git a/tools/testing/selftests/net/forwarding/router_mpath_nh.sh b/tools/testing/selftests/net/forwarding/router_mpath_nh.sh
index 3f0f5dc95542b..2ba44247c60ae 100755
--- a/tools/testing/selftests/net/forwarding/router_mpath_nh.sh
+++ b/tools/testing/selftests/net/forwarding/router_mpath_nh.sh
@@ -1,6 +1,41 @@
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
+# +-------------------------+
+# |  H1                     |
+# |               $h1 +     |
+# |      192.0.2.2/24 |     |
+# |  2001:db8:1::2/64 |     |
+# +-------------------|-----+
+#                     |
+# +-------------------|----------------------+
+# |                   |                   R1 |
+# |             $rp11 +                      |
+# |      192.0.2.1/24                        |
+# |  2001:db8:1::1/64                        |
+# |                                          |
+# |  + $rp12              + $rp13            |
+# |  | 169.254.2.12/24    | 169.254.3.13/24  |
+# |  | fe80:2::12/64      | fe80:3::13/64    |
+# +--|--------------------|------------------+
+#    |                    |
+# +--|--------------------|------------------+
+# |  + $rp22              + $rp23            |
+# |    169.254.2.22/24      169.254.3.23/24  |
+# |    fe80:2::22/64        fe80:3::23/64    |
+# |                                          |
+# |             $rp21 +                      |
+# |   198.51.100.1/24 |                      |
+# |  2001:db8:2::1/64 |                   R2 |
+# +-------------------|----------------------+
+#                     |
+# +-------------------|-----+
+# |                   |     |
+# |               $h2 +     |
+# |   198.51.100.2/24       |
+# |  2001:db8:2::2/64    H2 |
+# +-------------------------+
+
 ALL_TESTS="
 	ping_ipv4
 	ping_ipv6
diff --git a/tools/testing/selftests/net/forwarding/router_mpath_nh_res.sh b/tools/testing/selftests/net/forwarding/router_mpath_nh_res.sh
index 4b483d24ad007..cd9e346436fcf 100755
--- a/tools/testing/selftests/net/forwarding/router_mpath_nh_res.sh
+++ b/tools/testing/selftests/net/forwarding/router_mpath_nh_res.sh
@@ -1,6 +1,41 @@
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
+# +-------------------------+
+# |  H1                     |
+# |               $h1 +     |
+# |      192.0.2.2/24 |     |
+# |  2001:db8:1::2/64 |     |
+# +-------------------|-----+
+#                     |
+# +-------------------|----------------------+
+# |                   |                   R1 |
+# |             $rp11 +                      |
+# |      192.0.2.1/24                        |
+# |  2001:db8:1::1/64                        |
+# |                                          |
+# |  + $rp12              + $rp13            |
+# |  | 169.254.2.12/24    | 169.254.3.13/24  |
+# |  | fe80:2::12/64      | fe80:3::13/64    |
+# +--|--------------------|------------------+
+#    |                    |
+# +--|--------------------|------------------+
+# |  + $rp22              + $rp23            |
+# |    169.254.2.22/24      169.254.3.23/24  |
+# |    fe80:2::22/64        fe80:3::23/64    |
+# |                                          |
+# |             $rp21 +                      |
+# |   198.51.100.1/24 |                      |
+# |  2001:db8:2::1/64 |                   R2 |
+# +-------------------|----------------------+
+#                     |
+# +-------------------|-----+
+# |                   |     |
+# |               $h2 +     |
+# |   198.51.100.2/24       |
+# |  2001:db8:2::2/64    H2 |
+# +-------------------------+
+
 ALL_TESTS="
 	ping_ipv4
 	ping_ipv6
diff --git a/tools/testing/selftests/net/forwarding/router_nh.sh b/tools/testing/selftests/net/forwarding/router_nh.sh
index f3a53738bdcc3..92904b01eae97 100755
--- a/tools/testing/selftests/net/forwarding/router_nh.sh
+++ b/tools/testing/selftests/net/forwarding/router_nh.sh
@@ -1,6 +1,20 @@
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
+# +-------------------------+  +-------------------------+
+# | H1                      |  |                      H2 |
+# |               $h1 +     |  |               $h2 +     |
+# |      192.0.2.2/24 |     |  |   198.51.100.2/24 |     |
+# |  2001:db8:1::2/64 |     |  |  2001:db8:2::2/64 |     |
+# +-------------------|-----+  +-------------------|-----+
+#                     |                            |
+# +-------------------|----------------------------|-----+
+# | R1                |                            |     |
+# |              $rp1 +                       $rp2 +     |
+# |      192.0.2.1/24              198.51.100.1/24       |
+# |  2001:db8:1::1/64             2001:db8:2::1/64       |
+# +------------------------------------------------------+
+
 ALL_TESTS="
 	ping_ipv4
 	ping_ipv6
diff --git a/tools/testing/selftests/net/lib.sh b/tools/testing/selftests/net/lib.sh
index b7f7b8695165b..c868c0aec1216 100644
--- a/tools/testing/selftests/net/lib.sh
+++ b/tools/testing/selftests/net/lib.sh
@@ -58,9 +58,10 @@ ksft_exit_status_merge()
 		$ksft_xfail $ksft_pass $ksft_skip $ksft_fail
 }
 
-busywait()
+loopy_wait()
 {
-	local timeout=$1; shift
+	local sleep_cmd=$1; shift
+	local timeout_ms=$1; shift
 
 	local start_time="$(date -u +%s%3N)"
 	while true
@@ -74,13 +75,22 @@ busywait()
 		fi
 
 		local current_time="$(date -u +%s%3N)"
-		if ((current_time - start_time > timeout)); then
+		if ((current_time - start_time > timeout_ms)); then
 			echo -n "$out"
 			return 1
 		fi
+
+		$sleep_cmd
 	done
 }
 
+busywait()
+{
+	local timeout_ms=$1; shift
+
+	loopy_wait : "$timeout_ms" "$@"
+}
+
 cleanup_ns()
 {
 	local ns=""