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Message-ID: <20250714225533.1490032-8-wilder@us.ibm.com>
Date: Mon, 14 Jul 2025 15:54:52 -0700
From: David Wilder <wilder@...ibm.com>
To: netdev@...r.kernel.org
Cc: jv@...sburgh.net, wilder@...ibm.com, pradeeps@...ux.vnet.ibm.com,
pradeep@...ibm.com, i.maximets@....org, amorenoz@...hat.com,
haliu@...hat.com
Subject: [PATCH net-next v5 7/7] bonding: Selftest and documentation for the arp_ip_target parameter.
This selftest provided a functional test for the arp_ip_target parameter
both with and without user supplied vlan tags.
and
Updates to the bonding documentation.
Signed-off-by: David Wilder <wilder@...ibm.com>
---
Documentation/networking/bonding.rst | 11 ++
.../selftests/drivers/net/bonding/Makefile | 3 +-
.../drivers/net/bonding/bond-arp-ip-target.sh | 179 ++++++++++++++++++
3 files changed, 192 insertions(+), 1 deletion(-)
create mode 100755 tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh
diff --git a/Documentation/networking/bonding.rst b/Documentation/networking/bonding.rst
index f8f5766703d4..4a80da56b784 100644
--- a/Documentation/networking/bonding.rst
+++ b/Documentation/networking/bonding.rst
@@ -313,6 +313,17 @@ arp_ip_target
maximum number of targets that can be specified is 16. The
default value is no IP addresses.
+ When an arp_ip_target is configured the bonding driver will
+ attempt to automatically determine what vlans the arp probe will
+ pass through. This process of gathering vlan tags is required
+ for the arp probe to be sent. However, in some configurations
+ this process may fail. In these cases you may manually
+ supply a list of vlan tags. To specify a list of vlan tags
+ append the ipv4 address with [tag1/tag2...]. For example:
+ arp_ip_target=10.0.0.1[10]. If you simply need to disable the
+ vlan discovery process you may provide an empty list, for example:
+ arp_ip_target=10.0.0.1[].
+
ns_ip6_target
Specifies the IPv6 addresses to use as IPv6 monitoring peers when
diff --git a/tools/testing/selftests/drivers/net/bonding/Makefile b/tools/testing/selftests/drivers/net/bonding/Makefile
index 2b10854e4b1e..c59bb2912a38 100644
--- a/tools/testing/selftests/drivers/net/bonding/Makefile
+++ b/tools/testing/selftests/drivers/net/bonding/Makefile
@@ -10,7 +10,8 @@ TEST_PROGS := \
mode-2-recovery-updelay.sh \
bond_options.sh \
bond-eth-type-change.sh \
- bond_macvlan_ipvlan.sh
+ bond_macvlan_ipvlan.sh \
+ bond-arp-ip-target.sh
TEST_FILES := \
lag_lib.sh \
diff --git a/tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh b/tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh
new file mode 100755
index 000000000000..e9af27f17d0f
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/bonding/bond-arp-ip-target.sh
@@ -0,0 +1,179 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Test bonding arp_ip_target.
+# Topology for Bond mode 1,5,6 testing
+#
+# +-------------------------+
+# | | Server
+# | bond.10.20.30 | 192.30.2.1/24
+# | | |
+# | bond0.10.20 | 192.20.2.1/24
+# | | |
+# | bond0.10 | 192.10.2.1/24
+# | | |
+# | bond0 | 192.0.2.1/24
+# | | |
+# | + |
+# | eth0 | eth1 |
+# | +---+---+ |
+# | | | |
+# +-------------------------+
+# | |
+# +-------------------------+
+# | | | |
+# | +---+-------+---+ | Gateway
+# | | br0 | |
+# | +-------+-------+ |
+# | | |
+# +-------------------------+
+# |
+# +-------------------------+
+# | | | Client
+# | eth0 | 192.0.0.2/24
+# | | |
+# | eth0.10 | 192.10.10.2/24
+# | | |
+# | eth0.10.20 | 192.20.20.2/24
+# | | |
+# | eth0.10.20.30 | 192.30.30.2/24
+# +-------------------------+
+
+lib_dir=$(dirname "$0")
+
+# shellcheck source=./bond_topo_2d1c.sh
+source "${lib_dir}"/bond_topo_2d1c.sh
+
+DEBUG=${DEBUG:-0}
+test "${DEBUG}" -ne 0 && set -x
+
+# vlan subnets
+c_ip4="192.0.2.10"
+c_ip4v10="192.10.2.10"
+c_ip4v20="192.20.2.10"
+
+ALL_TESTS="
+ no_vlan_hints
+ with_vlan_hints
+"
+
+# Build stacked vlans on top of an interface.
+stack_vlans()
+{
+ RET=0
+ local interface="$1"
+ local ns=$2
+ local last="$interface"
+ local tags="10 20"
+
+ if ! ip -n "${ns}" link show "${interface}" > /dev/null; then
+ RET=1
+ msg="Failed to create ${interface}"
+ return
+ fi
+
+ if [ "$ns" == "${s_ns}" ]; then host=1; else host=10;fi
+
+ for tag in $tags; do
+ ip -n "${ns}" link add link "$last" name "$last"."$tag" type vlan id "$tag"
+ ip -n "${ns}" address add 192."$tag".2."$host"/24 dev "$last"."$tag"
+ ip -n "${ns}" link set up dev "$last"."$tag"
+ last=$last.$tag
+ done
+}
+
+# Check for link flapping
+check_failure_count()
+{
+ RET=0
+ local ns=$1
+ local proc_file=/proc/net/bonding/$2
+ local counts
+
+ # Give the bond time to settle.
+ sleep 10
+
+ counts=$(ip netns exec "${ns}" grep -F "Link Failure Count" "${proc_file}" \
+ | awk -F: '{print $2}')
+
+ local i
+ for i in $counts; do
+ [ "$i" != 0 ] && RET=1
+ done
+}
+
+setup_bond_topo()
+{
+ setup_prepare
+ setup_wait
+ stack_vlans bond0 "${s_ns}"
+ stack_vlans eth0 "${c_ns}"
+}
+
+skip_with_vlan_hints()
+{
+ # check if iproute supports arp_ip_target with vlans option.
+ if ! ip -n "${s_ns}" link add bond2 type bond arp_ip_target 10.0.0.1[10]; then
+ ip -n "${s_ns}" link del bond2 2> /dev/null
+ return 0
+ fi
+ return 1
+}
+
+no_vlan_hints()
+{
+ RET=0
+ local targets="${c_ip4} ${c_ip4v10} ${c_ip4v20}"
+ local target
+ msg=""
+
+ for target in $targets; do
+ bond_reset "mode $mode arp_interval 100 arp_ip_target ${target}"
+
+ stack_vlans bond0 "${s_ns}"
+ if [ $RET -ne 0 ]; then
+ log_test "no_vlan_hints" "${msg}"
+ return
+ fi
+
+ check_failure_count "${s_ns}" bond0
+ log_test "arp_ip_target=${target} ${msg}"
+ done
+}
+
+with_vlan_hints()
+{
+ RET=0
+ local targets="${c_ip4}[] ${c_ip4v10}[10] ${c_ip4v20}[10/20]"
+ local target
+ msg=""
+
+ if skip_with_vlan_hints; then
+ log_test_skip "skip_with_vlan_hints" \
+ "Installed iproute doesn't support extended arp_ip_target options."
+ return 0
+ fi
+
+ for target in $targets; do
+ bond_reset "mode $mode arp_interval 100 arp_ip_target ${target}"
+
+ stack_vlans bond0 "${s_ns}"
+ if [ $RET -ne 0 ]; then
+ log_test "no_vlan_hints" "${msg}"
+ return
+ fi
+
+ check_failure_count "${s_ns}" bond0
+ log_test "arp_ip_target=${target} ${msg}"
+ done
+}
+
+
+trap cleanup EXIT
+
+mode=active-backup
+
+setup_bond_topo
+tests_run
+
+exit "$EXIT_STATUS"
--
2.43.5
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