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Date: Tue, 26 Jun 2018 02:08:05 +0200
From: Petr Machata <petrm@...lanox.com>
To: netdev@...r.kernel.org, linux-kselftest@...r.kernel.org
Cc: davem@...emloft.net, shuah@...nel.org
Subject: [PATCH net-next 5/6] selftests: forwarding: Test multipath tunneling
Add a GRE-tunneling test such that there are two tunnels involved, with
a multipath route listing both as next hops. Similarly to
router_multipath.sh, test that the distribution of traffic to the
tunnels honors the configured weights.
Signed-off-by: Petr Machata <petrm@...lanox.com>
Reviewed-by: Ido Schimmel <idosch@...lanox.com>
---
.../selftests/net/forwarding/gre_multipath.sh | 354 +++++++++++++++++++++
1 file changed, 354 insertions(+)
create mode 100755 tools/testing/selftests/net/forwarding/gre_multipath.sh
diff --git a/tools/testing/selftests/net/forwarding/gre_multipath.sh b/tools/testing/selftests/net/forwarding/gre_multipath.sh
new file mode 100755
index 000000000000..982cc8c23200
--- /dev/null
+++ b/tools/testing/selftests/net/forwarding/gre_multipath.sh
@@ -0,0 +1,354 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# Test traffic distribution when a wECMP route forwards traffic to two GRE
+# tunnels.
+#
+# +-------------------------+
+# | H1 |
+# | $h1 + |
+# | 192.0.2.1/28 | |
+# | 2001:db8:1::1/64 | |
+# +-------------------|-----+
+# |
+# +-------------------|------------------------+
+# | SW1 | |
+# | $ol1 + |
+# | 192.0.2.2/28 |
+# | 2001:db8:1::2/64 |
+# | |
+# | + g1a (gre) + g1b (gre) |
+# | loc=192.0.2.65 loc=192.0.2.81 |
+# | rem=192.0.2.66 --. rem=192.0.2.82 --. |
+# | tos=inherit | tos=inherit | |
+# | .------------------' | |
+# | | .------------------' |
+# | v v |
+# | + $ul1.111 (vlan) + $ul1.222 (vlan) |
+# | | 192.0.2.129/28 | 192.0.2.145/28 |
+# | \ / |
+# | \________________/ |
+# | | |
+# | + $ul1 |
+# +------------|-------------------------------+
+# |
+# +------------|-------------------------------+
+# | SW2 + $ul2 |
+# | _______|________ |
+# | / \ |
+# | / \ |
+# | + $ul2.111 (vlan) + $ul2.222 (vlan) |
+# | ^ 192.0.2.130/28 ^ 192.0.2.146/28 |
+# | | | |
+# | | '------------------. |
+# | '------------------. | |
+# | + g2a (gre) | + g2b (gre) | |
+# | loc=192.0.2.66 | loc=192.0.2.82 | |
+# | rem=192.0.2.65 --' rem=192.0.2.81 --' |
+# | tos=inherit tos=inherit |
+# | |
+# | $ol2 + |
+# | 192.0.2.17/28 | |
+# | 2001:db8:2::1/64 | |
+# +-------------------|------------------------+
+# |
+# +-------------------|-----+
+# | H2 | |
+# | $h2 + |
+# | 192.0.2.18/28 |
+# | 2001:db8:2::2/64 |
+# +-------------------------+
+
+ALL_TESTS="
+ ping_ipv4
+ ping_ipv6
+ multipath_ipv4
+ multipath_ipv6
+ multipath_ipv6_l4
+"
+
+NUM_NETIFS=6
+source lib.sh
+
+h1_create()
+{
+ simple_if_init $h1 192.0.2.1/28 2001:db8:1::1/64
+ ip route add vrf v$h1 192.0.2.16/28 via 192.0.2.2
+ ip route add vrf v$h1 2001:db8:2::/64 via 2001:db8:1::2
+}
+
+h1_destroy()
+{
+ ip route del vrf v$h1 2001:db8:2::/64 via 2001:db8:1::2
+ ip route del vrf v$h1 192.0.2.16/28 via 192.0.2.2
+ simple_if_fini $h1 192.0.2.1/28
+}
+
+sw1_create()
+{
+ simple_if_init $ol1 192.0.2.2/28 2001:db8:1::2/64
+ __simple_if_init $ul1 v$ol1
+ vlan_create $ul1 111 v$ol1 192.0.2.129/28
+ vlan_create $ul1 222 v$ol1 192.0.2.145/28
+
+ tunnel_create g1a gre 192.0.2.65 192.0.2.66 tos inherit dev v$ol1
+ __simple_if_init g1a v$ol1 192.0.2.65/32
+ ip route add vrf v$ol1 192.0.2.66/32 via 192.0.2.130
+
+ tunnel_create g1b gre 192.0.2.81 192.0.2.82 tos inherit dev v$ol1
+ __simple_if_init g1b v$ol1 192.0.2.81/32
+ ip route add vrf v$ol1 192.0.2.82/32 via 192.0.2.146
+
+ ip route add vrf v$ol1 192.0.2.16/28 \
+ nexthop dev g1a \
+ nexthop dev g1b
+ ip route add vrf v$ol1 2001:db8:2::/64 \
+ nexthop dev g1a \
+ nexthop dev g1b
+
+ tc qdisc add dev $ul1 clsact
+ tc filter add dev $ul1 egress pref 111 prot 802.1q \
+ flower vlan_id 111 action pass
+ tc filter add dev $ul1 egress pref 222 prot 802.1q \
+ flower vlan_id 222 action pass
+}
+
+sw1_destroy()
+{
+ tc qdisc del dev $ul1 clsact
+
+ ip route del vrf v$ol1 2001:db8:2::/64
+ ip route del vrf v$ol1 192.0.2.16/28
+
+ ip route del vrf v$ol1 192.0.2.82/32 via 192.0.2.146
+ __simple_if_fini g1b 192.0.2.81/32
+ tunnel_destroy g1b
+
+ ip route del vrf v$ol1 192.0.2.66/32 via 192.0.2.130
+ __simple_if_fini g1a 192.0.2.65/32
+ tunnel_destroy g1a
+
+ vlan_destroy $ul1 222
+ vlan_destroy $ul1 111
+ __simple_if_fini $ul1
+ simple_if_fini $ol1 192.0.2.2/28 2001:db8:1::2/64
+}
+
+sw2_create()
+{
+ simple_if_init $ol2 192.0.2.17/28 2001:db8:2::1/64
+ __simple_if_init $ul2 v$ol2
+ vlan_create $ul2 111 v$ol2 192.0.2.130/28
+ vlan_create $ul2 222 v$ol2 192.0.2.146/28
+
+ tunnel_create g2a gre 192.0.2.66 192.0.2.65 tos inherit dev v$ol2
+ __simple_if_init g2a v$ol2 192.0.2.66/32
+ ip route add vrf v$ol2 192.0.2.65/32 via 192.0.2.129
+
+ tunnel_create g2b gre 192.0.2.82 192.0.2.81 tos inherit dev v$ol2
+ __simple_if_init g2b v$ol2 192.0.2.82/32
+ ip route add vrf v$ol2 192.0.2.81/32 via 192.0.2.145
+
+ ip route add vrf v$ol2 192.0.2.0/28 \
+ nexthop dev g2a \
+ nexthop dev g2b
+ ip route add vrf v$ol2 2001:db8:1::/64 \
+ nexthop dev g2a \
+ nexthop dev g2b
+}
+
+sw2_destroy()
+{
+ ip route del vrf v$ol2 2001:db8:1::/64
+ ip route del vrf v$ol2 192.0.2.0/28
+
+ ip route del vrf v$ol2 192.0.2.81/32 via 192.0.2.145
+ __simple_if_fini g2b 192.0.2.82/32
+ tunnel_destroy g2b
+
+ ip route del vrf v$ol2 192.0.2.65/32 via 192.0.2.129
+ __simple_if_fini g2a 192.0.2.66/32
+ tunnel_destroy g2a
+
+ vlan_destroy $ul2 222
+ vlan_destroy $ul2 111
+ __simple_if_fini $ul2
+ simple_if_fini $ol2 192.0.2.17/28 2001:db8:2::1/64
+}
+
+h2_create()
+{
+ simple_if_init $h2 192.0.2.18/28 2001:db8:2::2/64
+ ip route add vrf v$h2 192.0.2.0/28 via 192.0.2.17
+ ip route add vrf v$h2 2001:db8:1::/64 via 2001:db8:2::1
+}
+
+h2_destroy()
+{
+ ip route del vrf v$h2 2001:db8:1::/64 via 2001:db8:2::1
+ ip route del vrf v$h2 192.0.2.0/28 via 192.0.2.17
+ simple_if_fini $h2 192.0.2.18/28 2001:db8:2::2/64
+}
+
+setup_prepare()
+{
+ h1=${NETIFS[p1]}
+ ol1=${NETIFS[p2]}
+
+ ul1=${NETIFS[p3]}
+ ul2=${NETIFS[p4]}
+
+ ol2=${NETIFS[p5]}
+ h2=${NETIFS[p6]}
+
+ vrf_prepare
+ h1_create
+ sw1_create
+ sw2_create
+ h2_create
+}
+
+cleanup()
+{
+ pre_cleanup
+
+ h2_destroy
+ sw2_destroy
+ sw1_destroy
+ h1_destroy
+ vrf_cleanup
+}
+
+multipath4_test()
+{
+ local what=$1; shift
+ local weight1=$1; shift
+ local weight2=$1; shift
+
+ sysctl_set net.ipv4.fib_multipath_hash_policy 1
+ ip route replace vrf v$ol1 192.0.2.16/28 \
+ nexthop dev g1a weight $weight1 \
+ nexthop dev g1b weight $weight2
+
+ local t0_111=$(tc_rule_stats_get $ul1 111 egress)
+ local t0_222=$(tc_rule_stats_get $ul1 222 egress)
+
+ ip vrf exec v$h1 \
+ $MZ $h1 -q -p 64 -A 192.0.2.1 -B 192.0.2.18 \
+ -d 1msec -t udp "sp=1024,dp=0-32768"
+
+ local t1_111=$(tc_rule_stats_get $ul1 111 egress)
+ local t1_222=$(tc_rule_stats_get $ul1 222 egress)
+
+ local d111=$((t1_111 - t0_111))
+ local d222=$((t1_222 - t0_222))
+ multipath_eval "$what" $weight1 $weight2 $d111 $d222
+
+ ip route replace vrf v$ol1 192.0.2.16/28 \
+ nexthop dev g1a \
+ nexthop dev g1b
+ sysctl_restore net.ipv4.fib_multipath_hash_policy
+}
+
+multipath6_l4_test()
+{
+ local what=$1; shift
+ local weight1=$1; shift
+ local weight2=$1; shift
+
+ sysctl_set net.ipv6.fib_multipath_hash_policy 1
+ ip route replace vrf v$ol1 2001:db8:2::/64 \
+ nexthop dev g1a weight $weight1 \
+ nexthop dev g1b weight $weight2
+
+ local t0_111=$(tc_rule_stats_get $ul1 111 egress)
+ local t0_222=$(tc_rule_stats_get $ul1 222 egress)
+
+ ip vrf exec v$h1 \
+ $MZ $h1 -6 -q -p 64 -A 2001:db8:1::1 -B 2001:db8:2::2 \
+ -d 1msec -t udp "sp=1024,dp=0-32768"
+
+ local t1_111=$(tc_rule_stats_get $ul1 111 egress)
+ local t1_222=$(tc_rule_stats_get $ul1 222 egress)
+
+ local d111=$((t1_111 - t0_111))
+ local d222=$((t1_222 - t0_222))
+ multipath_eval "$what" $weight1 $weight2 $d111 $d222
+
+ ip route replace vrf v$ol1 2001:db8:2::/64 \
+ nexthop dev g1a \
+ nexthop dev g1b
+ sysctl_restore net.ipv6.fib_multipath_hash_policy
+}
+
+multipath6_test()
+{
+ local what=$1; shift
+ local weight1=$1; shift
+ local weight2=$1; shift
+
+ ip route replace vrf v$ol1 2001:db8:2::/64 \
+ nexthop dev g1a weight $weight1 \
+ nexthop dev g1b weight $weight2
+
+ local t0_111=$(tc_rule_stats_get $ul1 111 egress)
+ local t0_222=$(tc_rule_stats_get $ul1 222 egress)
+
+ # Generate 16384 echo requests, each with a random flow label.
+ for ((i=0; i < 16384; ++i)); do
+ ip vrf exec v$h1 $PING6 2001:db8:2::2 -F 0 -c 1 -q &> /dev/null
+ done
+
+ local t1_111=$(tc_rule_stats_get $ul1 111 egress)
+ local t1_222=$(tc_rule_stats_get $ul1 222 egress)
+
+ local d111=$((t1_111 - t0_111))
+ local d222=$((t1_222 - t0_222))
+ multipath_eval "$what" $weight1 $weight2 $d111 $d222
+
+ ip route replace vrf v$ol1 2001:db8:2::/64 \
+ nexthop dev g1a \
+ nexthop dev g1b
+}
+
+ping_ipv4()
+{
+ ping_test $h1 192.0.2.18
+}
+
+ping_ipv6()
+{
+ ping6_test $h1 2001:db8:2::2
+}
+
+multipath_ipv4()
+{
+ 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
+}
+
+multipath_ipv6()
+{
+ 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
+}
+
+multipath_ipv6_l4()
+{
+ log_info "Running IPv6 L4 hash multipath tests"
+ multipath6_l4_test "ECMP" 1 1
+ multipath6_l4_test "Weighted MP 2:1" 2 1
+ multipath6_l4_test "Weighted MP 11:45" 11 45
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+tests_run
+
+exit $EXIT_STATUS
--
2.4.11
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