@@ -46,6 +46,7 @@ TEST_PROGS += stress_reuseport_listen.sh
TEST_PROGS += l2_tos_ttl_inherit.sh
TEST_PROGS += bind_bhash.sh
TEST_PROGS += ip_local_port_range.sh
+TEST_PROGS += rps_default_mask.sh
TEST_PROGS_EXTENDED := in_netns.sh setup_loopback.sh setup_veth.sh
TEST_PROGS_EXTENDED += toeplitz_client.sh toeplitz.sh
TEST_GEN_FILES = socket nettest
@@ -3,6 +3,9 @@ CONFIG_NET_NS=y
CONFIG_BPF_SYSCALL=y
CONFIG_TEST_BPF=m
CONFIG_NUMA=y
+CONFIG_RPS=y
+CONFIG_SYSFS=y
+CONFIG_PROC_SYSCTL=y
CONFIG_NET_VRF=y
CONFIG_NET_L3_MASTER_DEV=y
CONFIG_IPV6=y
new file mode 100755
@@ -0,0 +1,57 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+readonly ksft_skip=4
+readonly cpus=$(nproc)
+ret=0
+
+[ $cpus -gt 2 ] || exit $ksft_skip
+
+readonly INITIAL_RPS_DEFAULT_MASK=$(cat /proc/sys/net/core/rps_default_mask)
+readonly NETNS="ns-$(mktemp -u XXXXXX)"
+
+setup() {
+ ip netns add "${NETNS}"
+ ip -netns "${NETNS}" link set lo up
+}
+
+cleanup() {
+ echo $INITIAL_RPS_DEFAULT_MASK > /proc/sys/net/core/rps_default_mask
+ ip netns del $NETNS
+}
+
+chk_rps() {
+ local rps_mask expected_rps_mask=$3
+ local dev_name=$2
+ local msg=$1
+
+ rps_mask=$(ip netns exec $NETNS cat /sys/class/net/$dev_name/queues/rx-0/rps_cpus)
+ printf "%-60s" "$msg"
+ if [ $rps_mask -eq $expected_rps_mask ]; then
+ echo "[ ok ]"
+ else
+ echo "[fail] expected $expected_rps_mask found $rps_mask"
+ ret=1
+ fi
+}
+
+trap cleanup EXIT
+
+echo 0 > /proc/sys/net/core/rps_default_mask
+setup
+chk_rps "empty rps_default_mask" lo 0
+cleanup
+
+echo 1 > /proc/sys/net/core/rps_default_mask
+setup
+chk_rps "non zero rps_default_mask" lo 1
+
+echo 3 > /proc/sys/net/core/rps_default_mask
+chk_rps "changing rps_default_mask dont affect existing netns" lo 1
+
+ip -n $NETNS link add type veth
+ip -n $NETNS link set dev veth0 up
+ip -n $NETNS link set dev veth1 up
+chk_rps "changing rps_default_mask affect newly created devices" veth0 3
+chk_rps "changing rps_default_mask affect newly created devices[II]" veth1 3
+exit $ret
Ensure that RPS default mask changes take place on all newly created netns/devices and don't affect existing ones. Signed-off-by: Paolo Abeni <pabeni@redhat.com> --- tools/testing/selftests/net/Makefile | 1 + tools/testing/selftests/net/config | 3 + .../testing/selftests/net/rps_default_mask.sh | 57 +++++++++++++++++++ 3 files changed, 61 insertions(+) create mode 100755 tools/testing/selftests/net/rps_default_mask.sh