selftests: forwarding: Add test for custom multipath hash
Test that when the hash policy is set to custom, traffic is distributed only according to the outer fields set in the fib_multipath_hash_fields sysctl. Each time set a different field and make sure traffic is only distributed when the field is changed in the packet stream. The test only verifies the behavior with non-encapsulated IPv4 and IPv6 packets. Subsequent patches will add tests for IPv4/IPv6 overlays on top of IPv4/IPv6 underlay networks. Example output: # ./custom_multipath_hash.sh TEST: ping [ OK ] TEST: ping6 [ OK ] INFO: Running IPv4 custom multipath hash tests TEST: Multipath hash field: Source IP (balanced) [ OK ] INFO: Packets sent on path1 / path2: 6353 / 6254 TEST: Multipath hash field: Source IP (unbalanced) [ OK ] INFO: Packets sent on path1 / path2: 0 / 12600 TEST: Multipath hash field: Destination IP (balanced) [ OK ] INFO: Packets sent on path1 / path2: 6102 / 6502 TEST: Multipath hash field: Destination IP (unbalanced) [ OK ] INFO: Packets sent on path1 / path2: 1 / 12601 TEST: Multipath hash field: Source port (balanced) [ OK ] INFO: Packets sent on path1 / path2: 16428 / 16345 TEST: Multipath hash field: Source port (unbalanced) [ OK ] INFO: Packets sent on path1 / path2: 32770 / 2 TEST: Multipath hash field: Destination port (balanced) [ OK ] INFO: Packets sent on path1 / path2: 16428 / 16345 TEST: Multipath hash field: Destination port (unbalanced) [ OK ] INFO: Packets sent on path1 / path2: 32770 / 2 INFO: Running IPv6 custom multipath hash tests TEST: Multipath hash field: Source IP (balanced) [ OK ] INFO: Packets sent on path1 / path2: 6704 / 5903 TEST: Multipath hash field: Source IP (unbalanced) [ OK ] INFO: Packets sent on path1 / path2: 12600 / 0 TEST: Multipath hash field: Destination IP (balanced) [ OK ] INFO: Packets sent on path1 / path2: 5551 / 7052 TEST: Multipath hash field: Destination IP (unbalanced) [ OK ] INFO: Packets sent on path1 / path2: 12603 / 0 TEST: Multipath hash field: Flowlabel (balanced) [ OK ] INFO: Packets sent on path1 / path2: 8378 / 8080 TEST: Multipath hash field: Flowlabel (unbalanced) [ OK ] INFO: Packets sent on path1 / path2: 2 / 12603 TEST: Multipath hash field: Source port (balanced) [ OK ] INFO: Packets sent on path1 / path2: 16385 / 16388 TEST: Multipath hash field: Source port (unbalanced) [ OK ] INFO: Packets sent on path1 / path2: 0 / 32774 TEST: Multipath hash field: Destination port (balanced) [ OK ] INFO: Packets sent on path1 / path2: 16386 / 16390 TEST: Multipath hash field: Destination port (unbalanced) [ OK ] INFO: Packets sent on path1 / path2: 32771 / 2 Signed-off-by: Ido Schimmel <idosch@nvidia.com> Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel
David S. Miller
parent
73c2c5cbb1
commit
511e8db540
364
tools/testing/selftests/net/forwarding/custom_multipath_hash.sh
Executable file
364
tools/testing/selftests/net/forwarding/custom_multipath_hash.sh
Executable file
@ -0,0 +1,364 @@
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#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# Test traffic distribution between two paths when using custom hash policy.
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#
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# +--------------------------------+
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# | H1 |
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# | $h1 + |
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# | 198.51.100.{2-253}/24 | |
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# | 2001:db8:1::{2-fd}/64 | |
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# +-------------------------|------+
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# |
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# +-------------------------|-------------------------+
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# | SW1 | |
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# | $rp1 + |
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# | 198.51.100.1/24 |
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# | 2001:db8:1::1/64 |
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# | |
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# | |
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# | $rp11 + + $rp12 |
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# | 192.0.2.1/28 | | 192.0.2.17/28 |
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# | 2001:db8:2::1/64 | | 2001:db8:3::1/64 |
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# +------------------|-------------|------------------+
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# | |
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# +------------------|-------------|------------------+
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# | SW2 | | |
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# | | | |
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# | $rp21 + + $rp22 |
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# | 192.0.2.2/28 192.0.2.18/28 |
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# | 2001:db8:2::2/64 2001:db8:3::2/64 |
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# | |
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# | |
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# | $rp2 + |
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# | 203.0.113.1/24 | |
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# | 2001:db8:4::1/64 | |
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# +-------------------------|-------------------------+
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# |
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# +-------------------------|------+
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# | H2 | |
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# | $h2 + |
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# | 203.0.113.{2-253}/24 |
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# | 2001:db8:4::{2-fd}/64 |
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# +--------------------------------+
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ALL_TESTS="
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ping_ipv4
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ping_ipv6
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custom_hash
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"
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NUM_NETIFS=8
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source lib.sh
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h1_create()
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{
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simple_if_init $h1 198.51.100.2/24 2001:db8:1::2/64
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ip route add vrf v$h1 default via 198.51.100.1 dev $h1
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ip -6 route add vrf v$h1 default via 2001:db8:1::1 dev $h1
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}
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h1_destroy()
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{
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ip -6 route del vrf v$h1 default
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ip route del vrf v$h1 default
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simple_if_fini $h1 198.51.100.2/24 2001:db8:1::2/64
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}
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sw1_create()
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{
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simple_if_init $rp1 198.51.100.1/24 2001:db8:1::1/64
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__simple_if_init $rp11 v$rp1 192.0.2.1/28 2001:db8:2::1/64
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__simple_if_init $rp12 v$rp1 192.0.2.17/28 2001:db8:3::1/64
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ip route add vrf v$rp1 203.0.113.0/24 \
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nexthop via 192.0.2.2 dev $rp11 \
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nexthop via 192.0.2.18 dev $rp12
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ip -6 route add vrf v$rp1 2001:db8:4::/64 \
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nexthop via 2001:db8:2::2 dev $rp11 \
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nexthop via 2001:db8:3::2 dev $rp12
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}
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sw1_destroy()
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{
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ip -6 route del vrf v$rp1 2001:db8:4::/64
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ip route del vrf v$rp1 203.0.113.0/24
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__simple_if_fini $rp12 192.0.2.17/28 2001:db8:3::1/64
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__simple_if_fini $rp11 192.0.2.1/28 2001:db8:2::1/64
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simple_if_fini $rp1 198.51.100.1/24 2001:db8:1::1/64
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}
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sw2_create()
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{
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simple_if_init $rp2 203.0.113.1/24 2001:db8:4::1/64
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__simple_if_init $rp21 v$rp2 192.0.2.2/28 2001:db8:2::2/64
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__simple_if_init $rp22 v$rp2 192.0.2.18/28 2001:db8:3::2/64
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ip route add vrf v$rp2 198.51.100.0/24 \
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nexthop via 192.0.2.1 dev $rp21 \
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nexthop via 192.0.2.17 dev $rp22
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ip -6 route add vrf v$rp2 2001:db8:1::/64 \
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nexthop via 2001:db8:2::1 dev $rp21 \
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nexthop via 2001:db8:3::1 dev $rp22
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}
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sw2_destroy()
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{
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ip -6 route del vrf v$rp2 2001:db8:1::/64
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ip route del vrf v$rp2 198.51.100.0/24
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__simple_if_fini $rp22 192.0.2.18/28 2001:db8:3::2/64
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__simple_if_fini $rp21 192.0.2.2/28 2001:db8:2::2/64
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simple_if_fini $rp2 203.0.113.1/24 2001:db8:4::1/64
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}
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h2_create()
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{
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simple_if_init $h2 203.0.113.2/24 2001:db8:4::2/64
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ip route add vrf v$h2 default via 203.0.113.1 dev $h2
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ip -6 route add vrf v$h2 default via 2001:db8:4::1 dev $h2
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}
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h2_destroy()
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{
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ip -6 route del vrf v$h2 default
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ip route del vrf v$h2 default
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simple_if_fini $h2 203.0.113.2/24 2001:db8:4::2/64
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}
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setup_prepare()
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{
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h1=${NETIFS[p1]}
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rp1=${NETIFS[p2]}
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rp11=${NETIFS[p3]}
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rp21=${NETIFS[p4]}
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rp12=${NETIFS[p5]}
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rp22=${NETIFS[p6]}
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rp2=${NETIFS[p7]}
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h2=${NETIFS[p8]}
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vrf_prepare
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h1_create
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sw1_create
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sw2_create
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h2_create
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forwarding_enable
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}
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cleanup()
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{
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pre_cleanup
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forwarding_restore
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h2_destroy
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sw2_destroy
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sw1_destroy
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h1_destroy
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vrf_cleanup
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}
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ping_ipv4()
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{
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ping_test $h1 203.0.113.2
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}
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ping_ipv6()
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{
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ping6_test $h1 2001:db8:4::2
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}
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send_src_ipv4()
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{
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$MZ $h1 -q -p 64 -A "198.51.100.2-198.51.100.253" -B 203.0.113.2 \
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-d 1msec -c 50 -t udp "sp=20000,dp=30000"
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}
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send_dst_ipv4()
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{
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$MZ $h1 -q -p 64 -A 198.51.100.2 -B "203.0.113.2-203.0.113.253" \
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-d 1msec -c 50 -t udp "sp=20000,dp=30000"
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}
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send_src_udp4()
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{
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$MZ $h1 -q -p 64 -A 198.51.100.2 -B 203.0.113.2 \
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-d 1msec -t udp "sp=0-32768,dp=30000"
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}
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send_dst_udp4()
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{
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$MZ $h1 -q -p 64 -A 198.51.100.2 -B 203.0.113.2 \
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-d 1msec -t udp "sp=20000,dp=0-32768"
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}
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send_src_ipv6()
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{
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$MZ -6 $h1 -q -p 64 -A "2001:db8:1::2-2001:db8:1::fd" -B 2001:db8:4::2 \
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-d 1msec -c 50 -t udp "sp=20000,dp=30000"
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}
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send_dst_ipv6()
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{
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$MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B "2001:db8:4::2-2001:db8:4::fd" \
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-d 1msec -c 50 -t udp "sp=20000,dp=30000"
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}
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send_flowlabel()
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{
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# Generate 16384 echo requests, each with a random flow label.
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for _ in $(seq 1 16384); do
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ip vrf exec v$h1 \
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$PING6 2001:db8:4::2 -F 0 -c 1 -q >/dev/null 2>&1
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done
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}
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send_src_udp6()
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{
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$MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B 2001:db8:4::2 \
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-d 1msec -t udp "sp=0-32768,dp=30000"
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}
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send_dst_udp6()
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{
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$MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B 2001:db8:4::2 \
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-d 1msec -t udp "sp=20000,dp=0-32768"
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}
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custom_hash_test()
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{
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local field="$1"; shift
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local balanced="$1"; shift
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local send_flows="$@"
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RET=0
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local t0_rp11=$(link_stats_tx_packets_get $rp11)
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local t0_rp12=$(link_stats_tx_packets_get $rp12)
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$send_flows
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local t1_rp11=$(link_stats_tx_packets_get $rp11)
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local t1_rp12=$(link_stats_tx_packets_get $rp12)
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local d_rp11=$((t1_rp11 - t0_rp11))
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local d_rp12=$((t1_rp12 - t0_rp12))
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local diff=$((d_rp12 - d_rp11))
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local sum=$((d_rp11 + d_rp12))
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local pct=$(echo "$diff / $sum * 100" | bc -l)
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local is_balanced=$(echo "-20 <= $pct && $pct <= 20" | bc)
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[[ ( $is_balanced -eq 1 && $balanced == "balanced" ) ||
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( $is_balanced -eq 0 && $balanced == "unbalanced" ) ]]
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check_err $? "Expected traffic to be $balanced, but it is not"
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log_test "Multipath hash field: $field ($balanced)"
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log_info "Packets sent on path1 / path2: $d_rp11 / $d_rp12"
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}
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custom_hash_v4()
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{
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log_info "Running IPv4 custom multipath hash tests"
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sysctl_set net.ipv4.fib_multipath_hash_policy 3
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# Prevent the neighbour table from overflowing, as different neighbour
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# entries will be created on $ol4 when using different destination IPs.
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sysctl_set net.ipv4.neigh.default.gc_thresh1 1024
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sysctl_set net.ipv4.neigh.default.gc_thresh2 1024
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sysctl_set net.ipv4.neigh.default.gc_thresh3 1024
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sysctl_set net.ipv4.fib_multipath_hash_fields 0x0001
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custom_hash_test "Source IP" "balanced" send_src_ipv4
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custom_hash_test "Source IP" "unbalanced" send_dst_ipv4
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sysctl_set net.ipv4.fib_multipath_hash_fields 0x0002
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custom_hash_test "Destination IP" "balanced" send_dst_ipv4
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custom_hash_test "Destination IP" "unbalanced" send_src_ipv4
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sysctl_set net.ipv4.fib_multipath_hash_fields 0x0010
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custom_hash_test "Source port" "balanced" send_src_udp4
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custom_hash_test "Source port" "unbalanced" send_dst_udp4
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sysctl_set net.ipv4.fib_multipath_hash_fields 0x0020
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custom_hash_test "Destination port" "balanced" send_dst_udp4
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custom_hash_test "Destination port" "unbalanced" send_src_udp4
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sysctl_restore net.ipv4.neigh.default.gc_thresh3
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sysctl_restore net.ipv4.neigh.default.gc_thresh2
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sysctl_restore net.ipv4.neigh.default.gc_thresh1
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sysctl_restore net.ipv4.fib_multipath_hash_policy
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}
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custom_hash_v6()
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{
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log_info "Running IPv6 custom multipath hash tests"
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sysctl_set net.ipv6.fib_multipath_hash_policy 3
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# Prevent the neighbour table from overflowing, as different neighbour
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# entries will be created on $ol4 when using different destination IPs.
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sysctl_set net.ipv6.neigh.default.gc_thresh1 1024
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sysctl_set net.ipv6.neigh.default.gc_thresh2 1024
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sysctl_set net.ipv6.neigh.default.gc_thresh3 1024
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sysctl_set net.ipv6.fib_multipath_hash_fields 0x0001
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custom_hash_test "Source IP" "balanced" send_src_ipv6
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custom_hash_test "Source IP" "unbalanced" send_dst_ipv6
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sysctl_set net.ipv6.fib_multipath_hash_fields 0x0002
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custom_hash_test "Destination IP" "balanced" send_dst_ipv6
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custom_hash_test "Destination IP" "unbalanced" send_src_ipv6
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sysctl_set net.ipv6.fib_multipath_hash_fields 0x0008
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custom_hash_test "Flowlabel" "balanced" send_flowlabel
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custom_hash_test "Flowlabel" "unbalanced" send_src_ipv6
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sysctl_set net.ipv6.fib_multipath_hash_fields 0x0010
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custom_hash_test "Source port" "balanced" send_src_udp6
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custom_hash_test "Source port" "unbalanced" send_dst_udp6
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sysctl_set net.ipv6.fib_multipath_hash_fields 0x0020
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custom_hash_test "Destination port" "balanced" send_dst_udp6
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custom_hash_test "Destination port" "unbalanced" send_src_udp6
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sysctl_restore net.ipv6.neigh.default.gc_thresh3
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sysctl_restore net.ipv6.neigh.default.gc_thresh2
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sysctl_restore net.ipv6.neigh.default.gc_thresh1
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sysctl_restore net.ipv6.fib_multipath_hash_policy
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}
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custom_hash()
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{
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# Test that when the hash policy is set to custom, traffic is
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# distributed only according to the fields set in the
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# fib_multipath_hash_fields sysctl.
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#
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# Each time set a different field and make sure traffic is only
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# distributed when the field is changed in the packet stream.
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custom_hash_v4
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custom_hash_v6
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}
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trap cleanup EXIT
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setup_prepare
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setup_wait
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tests_run
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exit $EXIT_STATUS
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