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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>
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tools/testing/selftests/net/forwarding/custom_multipath_hash.sh
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| @@ -0,0 +1,364 @@ | ||
| #!/bin/bash | ||
| # SPDX-License-Identifier: GPL-2.0 | ||
| # | ||
| # Test traffic distribution between two paths when using custom hash policy. | ||
| # | ||
| # +--------------------------------+ | ||
| # | H1 | | ||
| # | $h1 + | | ||
| # | 198.51.100.{2-253}/24 | | | ||
| # | 2001:db8:1::{2-fd}/64 | | | ||
| # +-------------------------|------+ | ||
| # | | ||
| # +-------------------------|-------------------------+ | ||
| # | SW1 | | | ||
| # | $rp1 + | | ||
| # | 198.51.100.1/24 | | ||
| # | 2001:db8:1::1/64 | | ||
| # | | | ||
| # | | | ||
| # | $rp11 + + $rp12 | | ||
| # | 192.0.2.1/28 | | 192.0.2.17/28 | | ||
| # | 2001:db8:2::1/64 | | 2001:db8:3::1/64 | | ||
| # +------------------|-------------|------------------+ | ||
| # | | | ||
| # +------------------|-------------|------------------+ | ||
| # | SW2 | | | | ||
| # | | | | | ||
| # | $rp21 + + $rp22 | | ||
| # | 192.0.2.2/28 192.0.2.18/28 | | ||
| # | 2001:db8:2::2/64 2001:db8:3::2/64 | | ||
| # | | | ||
| # | | | ||
| # | $rp2 + | | ||
| # | 203.0.113.1/24 | | | ||
| # | 2001:db8:4::1/64 | | | ||
| # +-------------------------|-------------------------+ | ||
| # | | ||
| # +-------------------------|------+ | ||
| # | H2 | | | ||
| # | $h2 + | | ||
| # | 203.0.113.{2-253}/24 | | ||
| # | 2001:db8:4::{2-fd}/64 | | ||
| # +--------------------------------+ | ||
|
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||
| ALL_TESTS=" | ||
| ping_ipv4 | ||
| ping_ipv6 | ||
| custom_hash | ||
| " | ||
|
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| NUM_NETIFS=8 | ||
| source lib.sh | ||
|
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| h1_create() | ||
| { | ||
| simple_if_init $h1 198.51.100.2/24 2001:db8:1::2/64 | ||
| ip route add vrf v$h1 default via 198.51.100.1 dev $h1 | ||
| ip -6 route add vrf v$h1 default via 2001:db8:1::1 dev $h1 | ||
| } | ||
|
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||
| h1_destroy() | ||
| { | ||
| ip -6 route del vrf v$h1 default | ||
| ip route del vrf v$h1 default | ||
| simple_if_fini $h1 198.51.100.2/24 2001:db8:1::2/64 | ||
| } | ||
|
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||
| sw1_create() | ||
| { | ||
| simple_if_init $rp1 198.51.100.1/24 2001:db8:1::1/64 | ||
| __simple_if_init $rp11 v$rp1 192.0.2.1/28 2001:db8:2::1/64 | ||
| __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 \ | ||
| nexthop via 192.0.2.2 dev $rp11 \ | ||
| nexthop via 192.0.2.18 dev $rp12 | ||
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| ip -6 route add vrf v$rp1 2001:db8:4::/64 \ | ||
| nexthop via 2001:db8:2::2 dev $rp11 \ | ||
| nexthop via 2001:db8:3::2 dev $rp12 | ||
| } | ||
|
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| sw1_destroy() | ||
| { | ||
| ip -6 route del vrf v$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 | ||
| __simple_if_fini $rp11 192.0.2.1/28 2001:db8:2::1/64 | ||
| simple_if_fini $rp1 198.51.100.1/24 2001:db8:1::1/64 | ||
| } | ||
|
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||
| sw2_create() | ||
| { | ||
| simple_if_init $rp2 203.0.113.1/24 2001:db8:4::1/64 | ||
| __simple_if_init $rp21 v$rp2 192.0.2.2/28 2001:db8:2::2/64 | ||
| __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 \ | ||
| nexthop via 192.0.2.1 dev $rp21 \ | ||
| nexthop via 192.0.2.17 dev $rp22 | ||
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| ip -6 route add vrf v$rp2 2001:db8:1::/64 \ | ||
| nexthop via 2001:db8:2::1 dev $rp21 \ | ||
| nexthop via 2001:db8:3::1 dev $rp22 | ||
| } | ||
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| sw2_destroy() | ||
| { | ||
| ip -6 route del vrf v$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 | ||
| __simple_if_fini $rp21 192.0.2.2/28 2001:db8:2::2/64 | ||
| simple_if_fini $rp2 203.0.113.1/24 2001:db8:4::1/64 | ||
| } | ||
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| h2_create() | ||
| { | ||
| simple_if_init $h2 203.0.113.2/24 2001:db8:4::2/64 | ||
| ip route add vrf v$h2 default via 203.0.113.1 dev $h2 | ||
| ip -6 route add vrf v$h2 default via 2001:db8:4::1 dev $h2 | ||
| } | ||
|
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| h2_destroy() | ||
| { | ||
| ip -6 route del vrf v$h2 default | ||
| ip route del vrf v$h2 default | ||
| simple_if_fini $h2 203.0.113.2/24 2001:db8:4::2/64 | ||
| } | ||
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| setup_prepare() | ||
| { | ||
| h1=${NETIFS[p1]} | ||
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| rp1=${NETIFS[p2]} | ||
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| rp11=${NETIFS[p3]} | ||
| rp21=${NETIFS[p4]} | ||
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| rp12=${NETIFS[p5]} | ||
| rp22=${NETIFS[p6]} | ||
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| rp2=${NETIFS[p7]} | ||
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| h2=${NETIFS[p8]} | ||
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| vrf_prepare | ||
| h1_create | ||
| sw1_create | ||
| sw2_create | ||
| h2_create | ||
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| forwarding_enable | ||
| } | ||
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| cleanup() | ||
| { | ||
| pre_cleanup | ||
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| forwarding_restore | ||
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| h2_destroy | ||
| sw2_destroy | ||
| sw1_destroy | ||
| h1_destroy | ||
| vrf_cleanup | ||
| } | ||
|
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| ping_ipv4() | ||
| { | ||
| ping_test $h1 203.0.113.2 | ||
| } | ||
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| ping_ipv6() | ||
| { | ||
| ping6_test $h1 2001:db8:4::2 | ||
| } | ||
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| send_src_ipv4() | ||
| { | ||
| $MZ $h1 -q -p 64 -A "198.51.100.2-198.51.100.253" -B 203.0.113.2 \ | ||
| -d 1msec -c 50 -t udp "sp=20000,dp=30000" | ||
| } | ||
|
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| send_dst_ipv4() | ||
| { | ||
| $MZ $h1 -q -p 64 -A 198.51.100.2 -B "203.0.113.2-203.0.113.253" \ | ||
| -d 1msec -c 50 -t udp "sp=20000,dp=30000" | ||
| } | ||
|
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||
| send_src_udp4() | ||
| { | ||
| $MZ $h1 -q -p 64 -A 198.51.100.2 -B 203.0.113.2 \ | ||
| -d 1msec -t udp "sp=0-32768,dp=30000" | ||
| } | ||
|
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||
| send_dst_udp4() | ||
| { | ||
| $MZ $h1 -q -p 64 -A 198.51.100.2 -B 203.0.113.2 \ | ||
| -d 1msec -t udp "sp=20000,dp=0-32768" | ||
| } | ||
|
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| send_src_ipv6() | ||
| { | ||
| $MZ -6 $h1 -q -p 64 -A "2001:db8:1::2-2001:db8:1::fd" -B 2001:db8:4::2 \ | ||
| -d 1msec -c 50 -t udp "sp=20000,dp=30000" | ||
| } | ||
|
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| send_dst_ipv6() | ||
| { | ||
| $MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B "2001:db8:4::2-2001:db8:4::fd" \ | ||
| -d 1msec -c 50 -t udp "sp=20000,dp=30000" | ||
| } | ||
|
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| send_flowlabel() | ||
| { | ||
| # Generate 16384 echo requests, each with a random flow label. | ||
| for _ in $(seq 1 16384); do | ||
| ip vrf exec v$h1 \ | ||
| $PING6 2001:db8:4::2 -F 0 -c 1 -q >/dev/null 2>&1 | ||
| done | ||
| } | ||
|
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| send_src_udp6() | ||
| { | ||
| $MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B 2001:db8:4::2 \ | ||
| -d 1msec -t udp "sp=0-32768,dp=30000" | ||
| } | ||
|
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| send_dst_udp6() | ||
| { | ||
| $MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B 2001:db8:4::2 \ | ||
| -d 1msec -t udp "sp=20000,dp=0-32768" | ||
| } | ||
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| custom_hash_test() | ||
| { | ||
| local field="$1"; shift | ||
| local balanced="$1"; shift | ||
| local send_flows="$@" | ||
|
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| RET=0 | ||
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| local t0_rp11=$(link_stats_tx_packets_get $rp11) | ||
| local t0_rp12=$(link_stats_tx_packets_get $rp12) | ||
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| $send_flows | ||
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| local t1_rp11=$(link_stats_tx_packets_get $rp11) | ||
| local t1_rp12=$(link_stats_tx_packets_get $rp12) | ||
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| local d_rp11=$((t1_rp11 - t0_rp11)) | ||
| local d_rp12=$((t1_rp12 - t0_rp12)) | ||
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| local diff=$((d_rp12 - d_rp11)) | ||
| local sum=$((d_rp11 + d_rp12)) | ||
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| local pct=$(echo "$diff / $sum * 100" | bc -l) | ||
| local is_balanced=$(echo "-20 <= $pct && $pct <= 20" | bc) | ||
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| [[ ( $is_balanced -eq 1 && $balanced == "balanced" ) || | ||
| ( $is_balanced -eq 0 && $balanced == "unbalanced" ) ]] | ||
| check_err $? "Expected traffic to be $balanced, but it is not" | ||
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| log_test "Multipath hash field: $field ($balanced)" | ||
| log_info "Packets sent on path1 / path2: $d_rp11 / $d_rp12" | ||
| } | ||
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| custom_hash_v4() | ||
| { | ||
| 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 | ||
| # entries will be created on $ol4 when using different destination IPs. | ||
| sysctl_set net.ipv4.neigh.default.gc_thresh1 1024 | ||
| sysctl_set net.ipv4.neigh.default.gc_thresh2 1024 | ||
| sysctl_set net.ipv4.neigh.default.gc_thresh3 1024 | ||
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| sysctl_set net.ipv4.fib_multipath_hash_fields 0x0001 | ||
| custom_hash_test "Source IP" "balanced" send_src_ipv4 | ||
| custom_hash_test "Source IP" "unbalanced" send_dst_ipv4 | ||
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| sysctl_set net.ipv4.fib_multipath_hash_fields 0x0002 | ||
| custom_hash_test "Destination IP" "balanced" send_dst_ipv4 | ||
| custom_hash_test "Destination IP" "unbalanced" send_src_ipv4 | ||
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| sysctl_set net.ipv4.fib_multipath_hash_fields 0x0010 | ||
| custom_hash_test "Source port" "balanced" send_src_udp4 | ||
| custom_hash_test "Source port" "unbalanced" send_dst_udp4 | ||
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| sysctl_set net.ipv4.fib_multipath_hash_fields 0x0020 | ||
| custom_hash_test "Destination port" "balanced" send_dst_udp4 | ||
| custom_hash_test "Destination port" "unbalanced" send_src_udp4 | ||
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| sysctl_restore net.ipv4.neigh.default.gc_thresh3 | ||
| sysctl_restore net.ipv4.neigh.default.gc_thresh2 | ||
| sysctl_restore net.ipv4.neigh.default.gc_thresh1 | ||
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| sysctl_restore net.ipv4.fib_multipath_hash_policy | ||
| } | ||
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| custom_hash_v6() | ||
| { | ||
| 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 | ||
| # entries will be created on $ol4 when using different destination IPs. | ||
| sysctl_set net.ipv6.neigh.default.gc_thresh1 1024 | ||
| sysctl_set net.ipv6.neigh.default.gc_thresh2 1024 | ||
| sysctl_set net.ipv6.neigh.default.gc_thresh3 1024 | ||
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| sysctl_set net.ipv6.fib_multipath_hash_fields 0x0001 | ||
| custom_hash_test "Source IP" "balanced" send_src_ipv6 | ||
| custom_hash_test "Source IP" "unbalanced" send_dst_ipv6 | ||
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| sysctl_set net.ipv6.fib_multipath_hash_fields 0x0002 | ||
| custom_hash_test "Destination IP" "balanced" send_dst_ipv6 | ||
| custom_hash_test "Destination IP" "unbalanced" send_src_ipv6 | ||
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| sysctl_set net.ipv6.fib_multipath_hash_fields 0x0008 | ||
| custom_hash_test "Flowlabel" "balanced" send_flowlabel | ||
| custom_hash_test "Flowlabel" "unbalanced" send_src_ipv6 | ||
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| sysctl_set net.ipv6.fib_multipath_hash_fields 0x0010 | ||
| custom_hash_test "Source port" "balanced" send_src_udp6 | ||
| custom_hash_test "Source port" "unbalanced" send_dst_udp6 | ||
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| sysctl_set net.ipv6.fib_multipath_hash_fields 0x0020 | ||
| custom_hash_test "Destination port" "balanced" send_dst_udp6 | ||
| custom_hash_test "Destination port" "unbalanced" send_src_udp6 | ||
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| sysctl_restore net.ipv6.neigh.default.gc_thresh3 | ||
| sysctl_restore net.ipv6.neigh.default.gc_thresh2 | ||
| sysctl_restore net.ipv6.neigh.default.gc_thresh1 | ||
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| sysctl_restore net.ipv6.fib_multipath_hash_policy | ||
| } | ||
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| custom_hash() | ||
| { | ||
| # Test that when the hash policy is set to custom, traffic is | ||
| # distributed only according to the 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. | ||
| custom_hash_v4 | ||
| custom_hash_v6 | ||
| } | ||
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| trap cleanup EXIT | ||
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| setup_prepare | ||
| setup_wait | ||
| tests_run | ||
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| exit $EXIT_STATUS |