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selftests: forwarding: Test IPv4 weighted nexthops

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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 <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2018-02-28 12:25:11 +02:00 committed by David S. Miller
parent 937eeb3482
commit 3d578d8795
2 changed files with 91 additions and 0 deletions
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14
tools/testing/selftests/net/forwarding/lib.sh
View file

@ -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

77
tools/testing/selftests/net/forwarding/router_multipath.sh
View file

@ -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