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linux/tools/testing/selftests/net/forwarding/router_multipath.sh
Ido Schimmel 748d27447d selftests: forwarding: Parametrize mausezahn delay 
The various multipath tests use mausezahn to generate different flows
and check how they are distributed between the available nexthops. The
tool is currently invoked with an hard coded transmission delay of 1 ms.
This is unnecessary when the tests are run with veth pairs and
needlessly prolongs the tests.

Parametrize this delay and default it to 0 us. It can be overridden
using the forwarding.config file. On my system, this reduces the run
time of router_multipath.sh by 93%.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Link: https://lore.kernel.org/r/20240304095612.462900-3-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-03-05 09:18:04 -08:00

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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
ALL_TESTS="ping_ipv4 ping_ipv6 multipath_test"
NUM_NETIFS=8
source lib.sh
h1_create()
{
vrf_create "vrf-h1"
ip link set dev $h1 master vrf-h1
ip link set dev vrf-h1 up
ip link set dev $h1 up
ip address add 192.0.2.2/24 dev $h1
ip address add 2001:db8:1::2/64 dev $h1
ip route add 198.51.100.0/24 vrf vrf-h1 nexthop via 192.0.2.1
ip route add 2001:db8:2::/64 vrf vrf-h1 nexthop via 2001:db8:1::1
}
h1_destroy()
{
ip route del 2001:db8:2::/64 vrf vrf-h1
ip route del 198.51.100.0/24 vrf vrf-h1
ip address del 2001:db8:1::2/64 dev $h1
ip address del 192.0.2.2/24 dev $h1
ip link set dev $h1 down
vrf_destroy "vrf-h1"
}
h2_create()
{
vrf_create "vrf-h2"
ip link set dev $h2 master vrf-h2
ip link set dev vrf-h2 up
ip link set dev $h2 up
ip address add 198.51.100.2/24 dev $h2
ip address add 2001:db8:2::2/64 dev $h2
ip route add 192.0.2.0/24 vrf vrf-h2 nexthop via 198.51.100.1
ip route add 2001:db8:1::/64 vrf vrf-h2 nexthop via 2001:db8:2::1
}
h2_destroy()
{
ip route del 2001:db8:1::/64 vrf vrf-h2
ip route del 192.0.2.0/24 vrf vrf-h2
ip address del 2001:db8:2::2/64 dev $h2
ip address del 198.51.100.2/24 dev $h2
ip link set dev $h2 down
vrf_destroy "vrf-h2"
}
router1_create()
{
vrf_create "vrf-r1"
ip link set dev $rp11 master vrf-r1
ip link set dev $rp12 master vrf-r1
ip link set dev $rp13 master vrf-r1
ip link set dev vrf-r1 up
ip link set dev $rp11 up
ip link set dev $rp12 up
ip link set dev $rp13 up
ip address add 192.0.2.1/24 dev $rp11
ip address add 2001:db8:1::1/64 dev $rp11
ip address add 169.254.2.12/24 dev $rp12
ip address add fe80:2::12/64 dev $rp12
ip address add 169.254.3.13/24 dev $rp13
ip address add fe80:3::13/64 dev $rp13
ip route add 198.51.100.0/24 vrf vrf-r1 \
nexthop via 169.254.2.22 dev $rp12 \
nexthop via 169.254.3.23 dev $rp13
ip route add 2001:db8:2::/64 vrf vrf-r1 \
nexthop via fe80:2::22 dev $rp12 \
nexthop via fe80:3::23 dev $rp13
}
router1_destroy()
{
ip route del 2001:db8:2::/64 vrf vrf-r1
ip route del 198.51.100.0/24 vrf vrf-r1
ip address del fe80:3::13/64 dev $rp13
ip address del 169.254.3.13/24 dev $rp13
ip address del fe80:2::12/64 dev $rp12
ip address del 169.254.2.12/24 dev $rp12
ip address del 2001:db8:1::1/64 dev $rp11
ip address del 192.0.2.1/24 dev $rp11
ip link set dev $rp13 down
ip link set dev $rp12 down
ip link set dev $rp11 down
vrf_destroy "vrf-r1"
}
router2_create()
{
vrf_create "vrf-r2"
ip link set dev $rp21 master vrf-r2
ip link set dev $rp22 master vrf-r2
ip link set dev $rp23 master vrf-r2
ip link set dev vrf-r2 up
ip link set dev $rp21 up
ip link set dev $rp22 up
ip link set dev $rp23 up
ip address add 198.51.100.1/24 dev $rp21
ip address add 2001:db8:2::1/64 dev $rp21
ip address add 169.254.2.22/24 dev $rp22
ip address add fe80:2::22/64 dev $rp22
ip address add 169.254.3.23/24 dev $rp23
ip address add fe80:3::23/64 dev $rp23
ip route add 192.0.2.0/24 vrf vrf-r2 \
nexthop via 169.254.2.12 dev $rp22 \
nexthop via 169.254.3.13 dev $rp23
ip route add 2001:db8:1::/64 vrf vrf-r2 \
nexthop via fe80:2::12 dev $rp22 \
nexthop via fe80:3::13 dev $rp23
}
router2_destroy()
{
ip route del 2001:db8:1::/64 vrf vrf-r2
ip route del 192.0.2.0/24 vrf vrf-r2
ip address del fe80:3::23/64 dev $rp23
ip address del 169.254.3.23/24 dev $rp23
ip address del fe80:2::22/64 dev $rp22
ip address del 169.254.2.22/24 dev $rp22
ip address del 2001:db8:2::1/64 dev $rp21
ip address del 198.51.100.1/24 dev $rp21
ip link set dev $rp23 down
ip link set dev $rp22 down
ip link set dev $rp21 down
vrf_destroy "vrf-r2"
}
multipath4_test()
{
local desc="$1"
local weight_rp12=$2
local weight_rp13=$3
local t0_rp12 t0_rp13 t1_rp12 t1_rp13
local packets_rp12 packets_rp13
# 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.
sysctl_set 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 $h1 -q -p 64 -A 192.0.2.2 -B 198.51.100.2 \
-d $MZ_DELAY -t udp "sp=1024,dp=0-32768"
t1_rp12=$(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 - $t0_rp13"
multipath_eval "$desc" $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_restore net.ipv4.fib_multipath_hash_policy
}
multipath6_test()
{
local desc="$1"
local weight_rp12=$2
local weight_rp13=$3
local t0_rp12 t0_rp13 t1_rp12 t1_rp13
local packets_rp12 packets_rp13
# 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.
sysctl_set net.ipv6.fib_multipath_hash_policy 1
ip route replace 2001:db8:2::/64 vrf vrf-r1 \
nexthop via fe80:2::22 dev $rp12 weight $weight_rp12 \
nexthop via fe80:3::23 dev $rp13 weight $weight_rp13
t0_rp12=$(link_stats_tx_packets_get $rp12)
t0_rp13=$(link_stats_tx_packets_get $rp13)
$MZ $h1 -6 -q -p 64 -A 2001:db8:1::2 -B 2001:db8:2::2 \
-d $MZ_DELAY -t udp "sp=1024,dp=0-32768"
t1_rp12=$(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 - $t0_rp13"
multipath_eval "$desc" $weight_rp12 $weight_rp13 $packets_rp12 $packets_rp13
ip route replace 2001:db8:2::/64 vrf vrf-r1 \
nexthop via fe80:2::22 dev $rp12 \
nexthop via fe80:3::23 dev $rp13
sysctl_restore net.ipv6.fib_multipath_hash_policy
}
multipath_test()
{
log_info "Running IPv4 multipath tests"
multipath4_test "ECMP" 1 1
multipath4_test "Weighted MP 2:1" 2 1
multipath4_test "Weighted MP 11:45" 11 45
log_info "Running IPv6 multipath tests"
multipath6_test "ECMP" 1 1
multipath6_test "Weighted MP 2:1" 2 1
multipath6_test "Weighted MP 11:45" 11 45
}
setup_prepare()
{
h1=${NETIFS[p1]}
rp11=${NETIFS[p2]}
rp12=${NETIFS[p3]}
rp22=${NETIFS[p4]}
rp13=${NETIFS[p5]}
rp23=${NETIFS[p6]}
rp21=${NETIFS[p7]}
h2=${NETIFS[p8]}
vrf_prepare
h1_create
h2_create
router1_create
router2_create
forwarding_enable
}
cleanup()
{
pre_cleanup
forwarding_restore
router2_destroy
router1_destroy
h2_destroy
h1_destroy
vrf_cleanup
}
ping_ipv4()
{
ping_test $h1 198.51.100.2
}
ping_ipv6()
{
ping6_test $h1 2001:db8:2::2
}
trap cleanup EXIT
setup_prepare
setup_wait
tests_run
exit $EXIT_STATUS
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