From 3d578d879517a97f4af867e6a8a021baf15e5101 Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Wed, 28 Feb 2018 12:25:11 +0200 Subject: [PATCH] selftests: forwarding: Test IPv4 weighted nexthops Use different weights for the multipath route configured on the first router and check that the different flows generated by the first host are distributed according to the provided weights. Signed-off-by: Ido Schimmel Signed-off-by: David S. Miller --- tools/testing/selftests/net/forwarding/lib.sh | 14 ++++ .../selftests/net/forwarding/router_multipath.sh | 77 ++++++++++++++++++++++ 2 files changed, 91 insertions(+) diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh index 962153b..6866f4a 100644 --- a/tools/testing/selftests/net/forwarding/lib.sh +++ b/tools/testing/selftests/net/forwarding/lib.sh @@ -113,6 +113,13 @@ log_test() return 0 } +log_info() +{ + local msg=$1 + + echo "INFO: $msg" +} + setup_wait() { for i in $(eval echo {1..$NUM_NETIFS}); do @@ -256,6 +263,13 @@ master_name_get() ip -j link show dev $if_name | jq -r '.[]["master"]' } +link_stats_tx_packets_get() +{ + local if_name=$1 + + ip -j -s link show dev $if_name | jq '.[]["stats64"]["tx"]["packets"]' +} + bridge_ageing_time_get() { local bridge=$1 diff --git a/tools/testing/selftests/net/forwarding/router_multipath.sh b/tools/testing/selftests/net/forwarding/router_multipath.sh index 86d189b..5b425df 100755 --- a/tools/testing/selftests/net/forwarding/router_multipath.sh +++ b/tools/testing/selftests/net/forwarding/router_multipath.sh @@ -158,6 +158,82 @@ router2_destroy() vrf_destroy "vrf-r2" } +multipath_eval() +{ + local weight_rp12=$1 + local weight_rp13=$2 + local packets_rp12=$3 + local packets_rp13=$4 + local weights_ratio packets_ratio diff + + RET=0 + + if [[ "$weight_rp12" -gt "$weight_rp13" ]]; then + weights_ratio=$(echo "scale=2; $weight_rp12 / $weight_rp13" \ + | bc -l) + packets_ratio=$(echo "scale=2; $packets_rp12 / $packets_rp13" \ + | bc -l) + else + weights_ratio=$(echo "scale=2; $weight_rp13 / $weight_rp12" | \ + bc -l) + packets_ratio=$(echo "scale=2; $packets_rp13 / $packets_rp12" | \ + bc -l) + fi + + diff=$(echo $weights_ratio - $packets_ratio | bc -l) + diff=${diff#-} + + test "$(echo "$diff / $weights_ratio > 0.1" | bc -l)" -eq 0 + check_err $? "Too large discrepancy between expected and measured ratios" + log_test "Multipath" + log_info "Expected ratio $weights_ratio Measured ratio $packets_ratio" +} + +multipath4_test() +{ + local weight_rp12=$1 + local weight_rp13=$2 + local t0_rp12 t0_rp13 t1_rp12 t1_rp13 + local packets_rp12 packets_rp13 + local hash_policy + + # Transmit multiple flows from h1 to h2 and make sure they are + # distributed between both multipath links (rp12 and rp13) + # according to the configured weights. + hash_policy=$(sysctl -n net.ipv4.fib_multipath_hash_policy) + sysctl -q -w net.ipv4.fib_multipath_hash_policy=1 + ip route replace 198.51.100.0/24 vrf vrf-r1 \ + nexthop via 169.254.2.22 dev $rp12 weight $weight_rp12 \ + nexthop via 169.254.3.23 dev $rp13 weight $weight_rp13 + + t0_rp12=$(link_stats_tx_packets_get $rp12) + t0_rp13=$(link_stats_tx_packets_get $rp13) + + ip vrf exec vrf-h1 $MZ -q -p 64 -A 192.0.2.2 -B 198.51.100.2 \ + -d 1msec -t udp "sp=1024,dp=0-32768" + + t1_rp12=$(link_stats_tx_packets_get $rp12) + t1_rp13=$(link_stats_tx_packets_get $rp13) + + let "packets_rp12 = $t1_rp12 - $t0_rp12" + let "packets_rp13 = $t1_rp13 - $t0_rp13" + multipath_eval $weight_rp12 $weight_rp13 $packets_rp12 $packets_rp13 + + # Restore settings. + ip route replace 198.51.100.0/24 vrf vrf-r1 \ + nexthop via 169.254.2.22 dev $rp12 \ + nexthop via 169.254.3.23 dev $rp13 + sysctl -q -w net.ipv4.fib_multipath_hash_policy=$hash_policy +} + +multipath_test() +{ + log_info "Running IPv4 multipath tests" + multipath4_test 1 1 + multipath4_test 2 1 + multipath4_test 11 45 +} + setup_prepare() { h1=${NETIFS[p1]} @@ -205,5 +281,6 @@ setup_wait ping_test $h1 198.51.100.2 ping6_test $h1 2001:db8:2::2 +multipath_test exit $EXIT_STATUS -- 2.7.4