[PATCH net v3 5/5] selftests: bonding: add test for fallback mode

[Louis Scalbert <louis.scalbert@6wind.com>]

Add a test for the bonding legacy and strict LACP fallback modes.

Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>
---
 .../selftests/drivers/net/bonding/Makefile    |   1 +
 .../drivers/net/bonding/bond_lacp_fallback.sh | 299 ++++++++++++++++++
 2 files changed, 300 insertions(+)
 create mode 100755 tools/testing/selftests/drivers/net/bonding/bond_lacp_fallback.sh

diff --git a/tools/testing/selftests/drivers/net/bonding/Makefile b/tools/testing/selftests/drivers/net/bonding/Makefile
index 6c5c60adb5e8..a117bf2e483b 100644
--- a/tools/testing/selftests/drivers/net/bonding/Makefile
+++ b/tools/testing/selftests/drivers/net/bonding/Makefile
@@ -7,6 +7,7 @@ TEST_PROGS := \
 	bond-eth-type-change.sh \
 	bond-lladdr-target.sh \
 	bond_ipsec_offload.sh \
+	bond_lacp_fallback.sh \
 	bond_lacp_prio.sh \
 	bond_macvlan_ipvlan.sh \
 	bond_options.sh \
diff --git a/tools/testing/selftests/drivers/net/bonding/bond_lacp_fallback.sh b/tools/testing/selftests/drivers/net/bonding/bond_lacp_fallback.sh
new file mode 100755
index 000000000000..a983a2c2ea17
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/bonding/bond_lacp_fallback.sh
@@ -0,0 +1,299 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Testing if bond lacp_fallback works
+#
+#          Partner (p_ns)
+#  +-------------------------+
+#  |          bond0          |
+#  |            +            |
+#  |      eth0  |  eth1      |
+#  |        +---+---+        |
+#  |        |       |        |
+#  +-------------------------+
+#           |       |
+#  +--------------------------+
+#  |        |       |         |
+#  |        +---+---+         |
+#  |      eth0  |  eth1       |
+#  |            +             |
+#  |          bond0           |
+#  +--------------------------+
+#         Dut (d_ns)
+
+lib_dir=$(dirname "$0")
+# shellcheck disable=SC1090
+source "$lib_dir"/../../../net/lib.sh
+
+COLLECTING_DISTRIBUTING_MASK=48
+COLLECTING_DISTRIBUTING=48
+FAILED=0
+
+setup_links()
+{
+	# shellcheck disable=SC2154
+	ip -n "${d_ns}" link add eth0 type veth peer name eth0 netns "${p_ns}"
+	ip -n "${d_ns}" link add eth1 type veth peer name eth1 netns "${p_ns}"
+
+	ip -n "${d_ns}" link add bond0 type bond mode 802.3ad miimon 100 \
+		lacp_rate fast min_links 1
+	ip -n "${p_ns}" link add bond0 type bond mode 802.3ad miimon 100 \
+		lacp_rate fast min_links 1
+
+	ip -n "${d_ns}" link set eth0 master bond0
+	ip -n "${d_ns}" link set eth1 master bond0
+	ip -n "${p_ns}" link set eth0 master bond0
+	ip -n "${p_ns}" link set eth1 master bond0
+
+	ip -n "${d_ns}" link set bond0 up
+	ip -n "${p_ns}" link set bond0 up
+}
+
+test_master_carrier() {
+	local expected=$1
+	local mode_name=$2
+	local carrier
+
+	carrier=$(ip netns exec "${d_ns}" cat /sys/class/net/bond0/carrier)
+	[ "$carrier" == "1" ] && carrier="up" || carrier="down"
+
+	[ "$carrier" == "$expected" ] && return
+
+	echo "FAIL: Expected carrier $expected in $mode_name mode, got $carrier"
+
+	RET=1
+
+}
+
+compare_state() {
+	local actual_state=$1
+	local expected_state=$2
+	local iface=$3
+	local last_attempt=$4
+
+    [ $((actual_state & COLLECTING_DISTRIBUTING_MASK)) -eq "$expected_state" ] \
+		&& return 0
+
+	[ "$last_attempt" -ne 1 ] && return 1
+
+	printf "FAIL: Expected LACP %s actor state to " "$iface"
+	if [ "$expected_state" -eq $COLLECTING_DISTRIBUTING ]; then
+		echo "be in Collecting/Distributing state"
+	else
+		echo "have neither Collecting nor Distributing set."
+	fi
+
+	return 1
+}
+
+_test_lacp_port_state() {
+	local interface=$1
+	local expected=$2
+	local last_attempt=$3
+	local eth0_actor_state eth1_actor_state
+	local ret=0
+
+	# shellcheck disable=SC2016
+	while IFS='=' read -r k v; do
+		printf -v "$k" '%s' "$v"
+	done < <(
+		ip netns exec "${d_ns}" awk '
+		/^Slave Interface: / { iface=$3 }
+		/details actor lacp pdu:/ { ctx="actor" }
+		/details partner lacp pdu:/ { ctx="partner" }
+		/^[[:space:]]+port state: / {
+			if (ctx == "actor") {
+				gsub(":", "", iface)
+				printf "%s_%s_state=%s\n", iface, ctx, $3
+			}
+		}
+		' /proc/net/bonding/bond0
+	)
+
+	if [ "$interface" == "eth0" ] || [ "$interface" == "both" ]; then
+		compare_state "$eth0_actor_state" "$expected" eth0 "$last_attempt" || ret=1
+	fi
+
+	if [ "$interface" == "eth1" ] || [ "$interface" == "both" ]; then
+		compare_state "$eth1_actor_state" "$expected" eth1 "$last_attempt" || ret=1
+	fi
+
+	return $ret
+}
+
+test_lacp_port_state() {
+	local interface=$1
+	local expected=$2
+	local retry=$3
+	local last_attempt=0
+	local attempt=1
+	local ret=1
+
+	while [ $attempt -le $((retry + 1)) ]; do
+		[ $attempt -eq $((retry + 1)) ] && last_attempt=1
+		_test_lacp_port_state "$interface" "$expected" "$last_attempt" && return
+		((attempt++))
+		sleep 1
+	done
+
+	RET=1
+}
+
+
+trap cleanup_all_ns EXIT
+setup_ns d_ns p_ns
+setup_links
+
+# Initial state
+RET=0
+mode=legacy
+test_lacp_port_state both $COLLECTING_DISTRIBUTING 3
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 and eth1 up"
+
+# partner eth0 down, eth1 up
+RET=0
+ip -n "${p_ns}" link set eth0 down
+test_lacp_port_state eth0 $FAILED 5
+test_lacp_port_state eth1 $COLLECTING_DISTRIBUTING 1
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 down"
+
+# partner eth0 and eth1 down
+RET=0
+ip -n "${p_ns}" link set eth1 down
+test_lacp_port_state both $FAILED 5
+test_master_carrier down $mode # down because of min_links
+log_test "bond LACP" "$mode fallback - eth0 and eth1 down"
+
+# partner eth0 up, eth1 down
+RET=0
+ip -n "${p_ns}" link set eth0 up
+test_lacp_port_state eth0 $COLLECTING_DISTRIBUTING 60
+test_lacp_port_state eth1 $FAILED 1
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 up, eth1 down"
+
+# partner eth0 and eth1 up
+RET=0
+ip -n "${p_ns}" link set eth1 up
+test_lacp_port_state both $COLLECTING_DISTRIBUTING 60
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 and eth1 up"
+
+# partner eth0 stops LACP and eth1 up
+RET=0
+ip netns exec "${p_ns}" tc qdisc add dev eth0 root netem loss 100%
+test_lacp_port_state eth0 $FAILED 5
+test_lacp_port_state eth1 $COLLECTING_DISTRIBUTING 1
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 stopped sending LACP"
+
+# partner eth0 and eth1 stop LACP
+RET=0
+ip netns exec "${p_ns}" tc qdisc add dev eth1 root netem loss 100%
+test_lacp_port_state both $FAILED 5
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 and eth1 stopped sending LACP"
+
+# switch to lacp_fallback strict
+RET=0
+mode=strict
+ip -n "${d_ns}" link set dev bond0 type bond lacp_fallback $mode
+test_lacp_port_state both $FAILED 1
+test_master_carrier down $mode 5
+log_test "bond LACP" "$mode fallback - eth0 and eth1 stopped sending LACP"
+
+# switch back to lacp_fallback legacy mode
+RET=0
+mode=legacy
+ip -n "${d_ns}" link set dev bond0 type bond lacp_fallback $mode
+test_lacp_port_state both $FAILED 1
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 and eth1 stopped sending LACP"
+
+# eth0 recovers LACP
+RET=0
+ip netns exec "${p_ns}" tc qdisc del dev eth0 root
+test_lacp_port_state eth0 $COLLECTING_DISTRIBUTING 60
+test_lacp_port_state eth1 $FAILED 1
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 recovered and eth1 stopped sending LACP"
+
+# eth1 recovers LACP
+RET=0
+ip netns exec "${p_ns}" tc qdisc del dev eth1 root
+test_lacp_port_state both $COLLECTING_DISTRIBUTING 60
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 and eth1 recovered LACP"
+
+# switch to lacp_fallback strict
+RET=0
+mode=strict
+ip -n "${d_ns}" link set dev bond0 type bond lacp_fallback $mode
+test_lacp_port_state both $COLLECTING_DISTRIBUTING 1
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 and eth1 up"
+
+# partner eth0 down, eth1 up
+RET=0
+ip -n "${p_ns}" link set eth0 down
+test_lacp_port_state eth0 $FAILED 5
+test_lacp_port_state eth1 $COLLECTING_DISTRIBUTING 1
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 down"
+
+# partner eth0 and eth1 down
+RET=0
+ip -n "${p_ns}" link set eth1 down
+test_lacp_port_state both $FAILED 5
+test_master_carrier down $mode # down because of min_links
+log_test "bond LACP" "$mode fallback - eth0 and eth1 down"
+
+# partner eth0 up, eth1 down
+RET=0
+ip -n "${p_ns}" link set eth0 up
+test_lacp_port_state eth0 $COLLECTING_DISTRIBUTING 60
+test_lacp_port_state eth1 $FAILED 1
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 up, eth1 down"
+
+# partner eth0 and eth1 up
+RET=0
+ip -n "${p_ns}" link set eth1 up
+test_lacp_port_state both $COLLECTING_DISTRIBUTING 60
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 and eth1 up"
+
+# partner eth0 stops LACP and eth1 up
+RET=0
+ip netns exec "${p_ns}" tc qdisc add dev eth0 root netem loss 100%
+test_lacp_port_state eth0 $FAILED 5
+test_lacp_port_state eth1 $COLLECTING_DISTRIBUTING 1
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 stopped sending LACP"
+
+# partner eth0 and eth1 stop LACP
+RET=0
+ip netns exec "${p_ns}" tc qdisc add dev eth1 root netem loss 100%
+test_lacp_port_state both $FAILED 5
+test_master_carrier down $mode
+log_test "bond LACP" "$mode fallback - eth0 and eth1 stopped sending LACP"
+
+# eth0 recovers LACP
+RET=0
+ip netns exec "${p_ns}" tc qdisc del dev eth0 root
+test_lacp_port_state eth0 $COLLECTING_DISTRIBUTING 60
+test_lacp_port_state eth1 $FAILED 1
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 recovered and eth1 stopped sending LACP"
+
+# eth1 recovers LACP
+# shellcheck disable=SC2034
+RET=0
+ip netns exec "${p_ns}" tc qdisc del dev eth1 root
+test_lacp_port_state both $COLLECTING_DISTRIBUTING 60
+test_master_carrier up $mode
+log_test "bond LACP" "$mode fallback - eth0 and eth1 recovered LACP"
+
+exit "${EXIT_STATUS}"
-- 
2.39.2