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selftests: forwarding: Test multipath hashing on inner IP pkts for GR…
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…E tunnel

Add selftest scripts for multipath hashing on inner IP pkts when there
is a single GRE tunnel but there are multiple underlay routes to reach
the other end of the tunnel.

Four cases are covered in these scripts:
    - IPv4 inner, IPv4 outer
    - IPv6 inner, IPv4 outer
    - IPv4 inner, IPv6 outer
    - IPv6 inner, IPv6 outer

Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Stephen Suryaputra <ssuryaextr@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Stephen Suryaputra authored and David S. Miller committed Jul 8, 2019
1 parent d8f74f0 commit 2800f24
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305 changes: 305 additions & 0 deletions tools/testing/selftests/net/forwarding/gre_inner_v4_multipath.sh
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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0

# Test traffic distribution when there are multiple routes between an IPv4
# GRE tunnel. The tunnel carries IPv4 traffic between multiple hosts.
# Multiple routes are in the underlay network. With the default multipath
# policy, SW2 will only look at the outer IP addresses, hence only a single
# route would be used.
#
# +-------------------------+
# | H1 |
# | $h1 + |
# | 192.0.3.{2-62}/24 | |
# +-------------------|-----+
# |
# +-------------------|------------------------+
# | SW1 | |
# | $ol1 + |
# | 192.0.3.1/24 |
# | |
# | + g1 (gre) |
# | loc=192.0.2.65 |
# | rem=192.0.2.66 --. |
# | tos=inherit | |
# | v |
# | + $ul1 |
# | | 192.0.2.129/28 |
# +---------------------|----------------------+
# |
# +---------------------|----------------------+
# | SW2 | |
# | $ul21 + |
# | 192.0.2.130/28 |
# | | |
# ! ________________|_____ |
# | / \ |
# | | | |
# | + $ul22.111 (vlan) + $ul22.222 (vlan) |
# | | 192.0.2.145/28 | 192.0.2.161/28 |
# | | | |
# +--|----------------------|------------------+
# | |
# +--|----------------------|------------------+
# | | | |
# | + $ul32.111 (vlan) + $ul32.222 (vlan) |
# | | 192.0.2.146/28 | 192.0.2.162/28 |
# | | | |
# | \______________________/ |
# | | |
# | | |
# | $ul31 + |
# | 192.0.2.177/28 | SW3 |
# +---------------------|----------------------+
# |
# +---------------------|----------------------+
# | + $ul4 |
# | ^ 192.0.2.178/28 |
# | | |
# | + g2 (gre) | |
# | loc=192.0.2.66 | |
# | rem=192.0.2.65 --' |
# | tos=inherit |
# | |
# | $ol4 + |
# | 192.0.4.1/24 | SW4 |
# +--------------------|-----------------------+
# |
# +--------------------|---------+
# | | |
# | $h2 + |
# | 192.0.4.{2-62}/24 H2 |
# +------------------------------+

ALL_TESTS="
ping_ipv4
multipath_ipv4
"

NUM_NETIFS=10
source lib.sh

h1_create()
{
simple_if_init $h1 192.0.3.2/24
ip route add vrf v$h1 192.0.4.0/24 via 192.0.3.1
}

h1_destroy()
{
ip route del vrf v$h1 192.0.4.0/24 via 192.0.3.1
simple_if_fini $h1 192.0.3.2/24
}

sw1_create()
{
simple_if_init $ol1 192.0.3.1/24
__simple_if_init $ul1 v$ol1 192.0.2.129/28

tunnel_create g1 gre 192.0.2.65 192.0.2.66 tos inherit dev v$ol1
__simple_if_init g1 v$ol1 192.0.2.65/32
ip route add vrf v$ol1 192.0.2.66/32 via 192.0.2.130

ip route add vrf v$ol1 192.0.4.0/24 nexthop dev g1
}

sw1_destroy()
{
ip route del vrf v$ol1 192.0.4.0/24

ip route del vrf v$ol1 192.0.2.66/32
__simple_if_fini g1 192.0.2.65/32
tunnel_destroy g1

__simple_if_fini $ul1 192.0.2.129/28
simple_if_fini $ol1 192.0.3.1/24
}

sw2_create()
{
simple_if_init $ul21 192.0.2.130/28
__simple_if_init $ul22 v$ul21
vlan_create $ul22 111 v$ul21 192.0.2.145/28
vlan_create $ul22 222 v$ul21 192.0.2.161/28

ip route add vrf v$ul21 192.0.2.65/32 via 192.0.2.129
ip route add vrf v$ul21 192.0.2.66/32 \
nexthop via 192.0.2.146 \
nexthop via 192.0.2.162
}

sw2_destroy()
{
ip route del vrf v$ul21 192.0.2.66/32
ip route del vrf v$ul21 192.0.2.65/32

vlan_destroy $ul22 222
vlan_destroy $ul22 111
__simple_if_fini $ul22
simple_if_fini $ul21 192.0.2.130/28
}

sw3_create()
{
simple_if_init $ul31 192.0.2.177/28
__simple_if_init $ul32 v$ul31
vlan_create $ul32 111 v$ul31 192.0.2.146/28
vlan_create $ul32 222 v$ul31 192.0.2.162/28

ip route add vrf v$ul31 192.0.2.66/32 via 192.0.2.178
ip route add vrf v$ul31 192.0.2.65/32 \
nexthop via 192.0.2.145 \
nexthop via 192.0.2.161

tc qdisc add dev $ul32 clsact
tc filter add dev $ul32 ingress pref 111 prot 802.1Q \
flower vlan_id 111 action pass
tc filter add dev $ul32 ingress pref 222 prot 802.1Q \
flower vlan_id 222 action pass
}

sw3_destroy()
{
tc qdisc del dev $ul32 clsact

ip route del vrf v$ul31 192.0.2.65/32
ip route del vrf v$ul31 192.0.2.66/32

vlan_destroy $ul32 222
vlan_destroy $ul32 111
__simple_if_fini $ul32
simple_if_fini $ul31 192.0.2.177/28
}

sw4_create()
{
simple_if_init $ol4 192.0.4.1/24
__simple_if_init $ul4 v$ol4 192.0.2.178/28

tunnel_create g2 gre 192.0.2.66 192.0.2.65 tos inherit dev v$ol4
__simple_if_init g2 v$ol4 192.0.2.66/32
ip route add vrf v$ol4 192.0.2.65/32 via 192.0.2.177

ip route add vrf v$ol4 192.0.3.0/24 nexthop dev g2
}

sw4_destroy()
{
ip route del vrf v$ol4 192.0.3.0/24

ip route del vrf v$ol4 192.0.2.65/32
__simple_if_fini g2 192.0.2.66/32
tunnel_destroy g2

__simple_if_fini $ul4 192.0.2.178/28
simple_if_fini $ol4 192.0.4.1/24
}

h2_create()
{
simple_if_init $h2 192.0.4.2/24
ip route add vrf v$h2 192.0.3.0/24 via 192.0.4.1
}

h2_destroy()
{
ip route del vrf v$h2 192.0.3.0/24 via 192.0.4.1
simple_if_fini $h2 192.0.4.2/24
}

setup_prepare()
{
h1=${NETIFS[p1]}

ol1=${NETIFS[p2]}
ul1=${NETIFS[p3]}

ul21=${NETIFS[p4]}
ul22=${NETIFS[p5]}

ul32=${NETIFS[p6]}
ul31=${NETIFS[p7]}

ul4=${NETIFS[p8]}
ol4=${NETIFS[p9]}

h2=${NETIFS[p10]}

vrf_prepare
h1_create
sw1_create
sw2_create
sw3_create
sw4_create
h2_create

forwarding_enable
}

cleanup()
{
pre_cleanup

forwarding_restore

h2_destroy
sw4_destroy
sw3_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 2
ip route replace vrf v$ul21 192.0.2.66/32 \
nexthop via 192.0.2.146 weight $weight1 \
nexthop via 192.0.2.162 weight $weight2

local t0_111=$(tc_rule_stats_get $ul32 111 ingress)
local t0_222=$(tc_rule_stats_get $ul32 222 ingress)

ip vrf exec v$h1 \
$MZ $h1 -q -p 64 -A "192.0.3.2-192.0.3.62" -B "192.0.4.2-192.0.4.62" \
-d 1msec -c 50 -t udp "sp=1024,dp=1024"
sleep 1

local t1_111=$(tc_rule_stats_get $ul32 111 ingress)
local t1_222=$(tc_rule_stats_get $ul32 222 ingress)

local d111=$((t1_111 - t0_111))
local d222=$((t1_222 - t0_222))
multipath_eval "$what" $weight1 $weight2 $d111 $d222

ip route replace vrf v$ul21 192.0.2.66/32 \
nexthop via 192.0.2.146 \
nexthop via 192.0.2.162
sysctl_restore net.ipv4.fib_multipath_hash_policy
}

ping_ipv4()
{
ping_test $h1 192.0.4.2
}

multipath_ipv4()
{
log_info "Running IPv4 over GRE over IPv4 multipath tests"
multipath4_test "ECMP" 1 1
multipath4_test "Weighted MP 2:1" 2 1
multipath4_test "Weighted MP 11:45" 11 45
}

trap cleanup EXIT

setup_prepare
setup_wait
tests_run

exit $EXIT_STATUS
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