The test uses perf stat to count the number of fib:fib_table_lookup tracepoint hits for IPv4 and the number of fib6:fib6_table_lookup for IPv6. The measured count is checked to be within 5% of the total number of packets sent via veth1.
Signed-off-by: Sriram Yagnaraman sriram.yagnaraman@est.tech --- tools/testing/selftests/net/fib_tests.sh | 155 ++++++++++++++++++++++- 1 file changed, 154 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/net/fib_tests.sh b/tools/testing/selftests/net/fib_tests.sh index d328af4a149c..e7d2a530618a 100755 --- a/tools/testing/selftests/net/fib_tests.sh +++ b/tools/testing/selftests/net/fib_tests.sh @@ -12,7 +12,8 @@ ksft_skip=4 TESTS="unregister down carrier nexthop suppress ipv6_notify ipv4_notify \ ipv6_rt ipv4_rt ipv6_addr_metric ipv4_addr_metric ipv6_route_metrics \ ipv4_route_metrics ipv4_route_v6_gw rp_filter ipv4_del_addr \ - ipv6_del_addr ipv4_mangle ipv6_mangle ipv4_bcast_neigh fib6_gc_test" + ipv6_del_addr ipv4_mangle ipv6_mangle ipv4_bcast_neigh fib6_gc_test \ + ipv4_mpath_list ipv6_mpath_list"
VERBOSE=0 PAUSE_ON_FAIL=no @@ -2352,6 +2353,156 @@ ipv4_bcast_neigh_test() cleanup }
+mpath_dep_check() +{ + if [ ! -x "$(command -v mausezahn)" ]; then + echo "mausezahn command not found. Skipping test" + return 1 + fi + + if [ ! -x "$(command -v jq)" ]; then + echo "jq command not found. Skipping test" + return 1 + fi + + if [ ! -x "$(command -v bc)" ]; then + echo "bc command not found. Skipping test" + return 1 + fi + + if [ ! -x "$(command -v perf)" ]; then + echo "perf command not found. Skipping test" + return 1 + fi + + perf list fib:* | grep -q fib_table_lookup + if [ $? -ne 0 ]; then + echo "IPv4 FIB tracepoint not found. Skipping test" + return 1 + fi + + perf list fib6:* | grep -q fib6_table_lookup + if [ $? -ne 0 ]; then + echo "IPv6 FIB tracepoint not found. Skipping test" + return 1 + fi + + return 0 +} + +link_stats_get() +{ + local ns=$1; shift + local dev=$1; shift + local dir=$1; shift + local stat=$1; shift + + ip -n $ns -j -s link show dev $dev \ + | jq '.[]["stats64"]["'$dir'"]["'$stat'"]' +} + +list_rcv_eval() +{ + local file=$1; shift + local expected=$1; shift + + local count=$(tail -n 1 $file | jq '.["counter-value"] | tonumber | floor') + local ratio=$(echo "scale=2; $count / $expected" | bc -l) + local res=$(echo "$ratio >= 0.95" | bc) + [[ $res -eq 1 ]] + log_test $? 0 "Multipath route hit ratio ($ratio)" +} + +ipv4_mpath_list_test() +{ + echo + echo "IPv4 multipath list receive tests" + + mpath_dep_check || return 1 + + route_setup + + set -e + run_cmd "ip netns exec ns1 ethtool -K veth1 tcp-segmentation-offload off" + + run_cmd "ip netns exec ns2 bash -c "echo 20000 > /sys/class/net/veth2/gro_flush_timeout"" + run_cmd "ip netns exec ns2 bash -c "echo 1 > /sys/class/net/veth2/napi_defer_hard_irqs"" + run_cmd "ip netns exec ns2 ethtool -K veth2 generic-receive-offload on" + run_cmd "ip -n ns2 link add name nh1 up type dummy" + run_cmd "ip -n ns2 link add name nh2 up type dummy" + run_cmd "ip -n ns2 address add 172.16.201.1/24 dev nh1" + run_cmd "ip -n ns2 address add 172.16.202.1/24 dev nh2" + run_cmd "ip -n ns2 neigh add 172.16.201.2 lladdr 00:11:22:33:44:55 nud perm dev nh1" + run_cmd "ip -n ns2 neigh add 172.16.202.2 lladdr 00:aa:bb:cc:dd:ee nud perm dev nh2" + run_cmd "ip -n ns2 route add 203.0.113.0/24 + nexthop via 172.16.201.2 nexthop via 172.16.202.2" + run_cmd "ip netns exec ns2 sysctl -qw net.ipv4.fib_multipath_hash_policy=1" + set +e + + local dmac=$(ip -n ns2 -j link show dev veth2 | jq -r '.[]["address"]') + local tmp_file=$(mktemp) + local cmd="ip netns exec ns1 mausezahn veth1 -a own -b $dmac + -A 172.16.101.1 -B 203.0.113.1 -t udp 'sp=12345,dp=0-65535' -q" + + # Packets forwarded in a list using a multipath route must not reuse a + # cached result so that a flow always hits the same nexthop. In other + # words, the FIB lookup tracepoint needs to be triggered for every + # packet. + local t0_rx_pkts=$(link_stats_get ns2 veth2 rx packets) + run_cmd "perf stat -e fib:fib_table_lookup --filter 'err == 0' -j -o $tmp_file -- $cmd" + local t1_rx_pkts=$(link_stats_get ns2 veth2 rx packets) + local diff=$(echo $t1_rx_pkts - $t0_rx_pkts | bc -l) + list_rcv_eval $tmp_file $diff + + rm $tmp_file + route_cleanup +} + +ipv6_mpath_list_test() +{ + echo + echo "IPv6 multipath list receive tests" + + mpath_dep_check || return 1 + + route_setup + + set -e + run_cmd "ip netns exec ns1 ethtool -K veth1 tcp-segmentation-offload off" + + run_cmd "ip netns exec ns2 bash -c "echo 20000 > /sys/class/net/veth2/gro_flush_timeout"" + run_cmd "ip netns exec ns2 bash -c "echo 1 > /sys/class/net/veth2/napi_defer_hard_irqs"" + run_cmd "ip netns exec ns2 ethtool -K veth2 generic-receive-offload on" + run_cmd "ip -n ns2 link add name nh1 up type dummy" + run_cmd "ip -n ns2 link add name nh2 up type dummy" + run_cmd "ip -n ns2 -6 address add 2001:db8:201::1/64 dev nh1" + run_cmd "ip -n ns2 -6 address add 2001:db8:202::1/64 dev nh2" + run_cmd "ip -n ns2 -6 neigh add 2001:db8:201::2 lladdr 00:11:22:33:44:55 nud perm dev nh1" + run_cmd "ip -n ns2 -6 neigh add 2001:db8:202::2 lladdr 00:aa:bb:cc:dd:ee nud perm dev nh2" + run_cmd "ip -n ns2 -6 route add 2001:db8:301::/64 + nexthop via 2001:db8:201::2 nexthop via 2001:db8:202::2" + run_cmd "ip netns exec ns2 sysctl -qw net.ipv6.fib_multipath_hash_policy=1" + set +e + + local dmac=$(ip -n ns2 -j link show dev veth2 | jq -r '.[]["address"]') + local tmp_file=$(mktemp) + local cmd="ip netns exec ns1 mausezahn -6 veth1 -a own -b $dmac + -A 2001:db8:101::1 -B 2001:db8:301::1 -t udp 'sp=12345,dp=0-65535' -q" + + # Packets forwarded in a list using a multipath route must not reuse a + # cached result so that a flow always hits the same nexthop. In other + # words, the FIB lookup tracepoint needs to be triggered for every + # packet. + local t0_rx_pkts=$(link_stats_get ns2 veth2 rx packets) + run_cmd "perf stat -e fib6:fib6_table_lookup --filter 'err == 0' -j -o $tmp_file -- $cmd" + local t1_rx_pkts=$(link_stats_get ns2 veth2 rx packets) + local diff=$(echo $t1_rx_pkts - $t0_rx_pkts | bc -l) + list_rcv_eval $tmp_file $diff + + rm $tmp_file + route_cleanup +} + ################################################################################ # usage
@@ -2433,6 +2584,8 @@ do ipv6_mangle) ipv6_mangle_test;; ipv4_bcast_neigh) ipv4_bcast_neigh_test;; fib6_gc_test|ipv6_gc) fib6_gc_test;; + ipv4_mpath_list) ipv4_mpath_list_test;; + ipv6_mpath_list) ipv6_mpath_list_test;;
help) echo "Test names: $TESTS"; exit 0;; esac