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selftests: forwarding: hw_stats_l3: Add a new test
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Add a test that verifies operation of L3 HW statistics.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Petr Machata authored and David S. Miller committed Mar 3, 2022
1 parent 8d0f7d3 commit ba95e79
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332 changes: 332 additions & 0 deletions tools/testing/selftests/net/forwarding/hw_stats_l3.sh
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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0

# +--------------------+ +----------------------+
# | H1 | | H2 |
# | | | |
# | $h1.200 + | | + $h2.200 |
# | 192.0.2.1/28 | | | | 192.0.2.18/28 |
# | 2001:db8:1::1/64 | | | | 2001:db8:2::1/64 |
# | | | | | |
# | $h1 + | | + $h2 |
# | | | | | |
# +------------------|-+ +-|--------------------+
# | |
# +------------------|-------------------------|--------------------+
# | SW | | |
# | | | |
# | $rp1 + + $rp2 |
# | | | |
# | $rp1.200 + + $rp2.200 |
# | 192.0.2.2/28 192.0.2.17/28 |
# | 2001:db8:1::2/64 2001:db8:2::2/64 |
# | |
# +-----------------------------------------------------------------+

ALL_TESTS="
ping_ipv4
ping_ipv6
test_stats_rx_ipv4
test_stats_tx_ipv4
test_stats_rx_ipv6
test_stats_tx_ipv6
respin_enablement
test_stats_rx_ipv4
test_stats_tx_ipv4
test_stats_rx_ipv6
test_stats_tx_ipv6
reapply_config
ping_ipv4
ping_ipv6
test_stats_rx_ipv4
test_stats_tx_ipv4
test_stats_rx_ipv6
test_stats_tx_ipv6
test_stats_report_rx
test_stats_report_tx
test_destroy_enabled
test_double_enable
"
NUM_NETIFS=4
source lib.sh

h1_create()
{
simple_if_init $h1
vlan_create $h1 200 v$h1 192.0.2.1/28 2001:db8:1::1/64
ip route add 192.0.2.16/28 vrf v$h1 nexthop via 192.0.2.2
ip -6 route add 2001:db8:2::/64 vrf v$h1 nexthop via 2001:db8:1::2
}

h1_destroy()
{
ip -6 route del 2001:db8:2::/64 vrf v$h1 nexthop via 2001:db8:1::2
ip route del 192.0.2.16/28 vrf v$h1 nexthop via 192.0.2.2
vlan_destroy $h1 200
simple_if_fini $h1
}

h2_create()
{
simple_if_init $h2
vlan_create $h2 200 v$h2 192.0.2.18/28 2001:db8:2::1/64
ip route add 192.0.2.0/28 vrf v$h2 nexthop via 192.0.2.17
ip -6 route add 2001:db8:1::/64 vrf v$h2 nexthop via 2001:db8:2::2
}

h2_destroy()
{
ip -6 route del 2001:db8:1::/64 vrf v$h2 nexthop via 2001:db8:2::2
ip route del 192.0.2.0/28 vrf v$h2 nexthop via 192.0.2.17
vlan_destroy $h2 200
simple_if_fini $h2
}

router_rp1_200_create()
{
ip link add name $rp1.200 up \
link $rp1 addrgenmode eui64 type vlan id 200
ip address add dev $rp1.200 192.0.2.2/28
ip address add dev $rp1.200 2001:db8:1::2/64
ip stats set dev $rp1.200 l3_stats on
}

router_rp1_200_destroy()
{
ip stats set dev $rp1.200 l3_stats off
ip address del dev $rp1.200 2001:db8:1::2/64
ip address del dev $rp1.200 192.0.2.2/28
ip link del dev $rp1.200
}

router_create()
{
ip link set dev $rp1 up
router_rp1_200_create

ip link set dev $rp2 up
vlan_create $rp2 200 "" 192.0.2.17/28 2001:db8:2::2/64
}

router_destroy()
{
vlan_destroy $rp2 200
ip link set dev $rp2 down

router_rp1_200_destroy
ip link set dev $rp1 down
}

setup_prepare()
{
h1=${NETIFS[p1]}
rp1=${NETIFS[p2]}

rp2=${NETIFS[p3]}
h2=${NETIFS[p4]}

rp1mac=$(mac_get $rp1)
rp2mac=$(mac_get $rp2)

vrf_prepare

h1_create
h2_create

router_create

forwarding_enable
}

cleanup()
{
pre_cleanup

forwarding_restore

router_destroy

h2_destroy
h1_destroy

vrf_cleanup
}

ping_ipv4()
{
ping_test $h1.200 192.0.2.18 " IPv4"
}

ping_ipv6()
{
ping_test $h1.200 2001:db8:2::1 " IPv6"
}

get_l3_stat()
{
local selector=$1; shift

ip -j stats show dev $rp1.200 group offload subgroup l3_stats |
jq '.[0].stats64.'$selector
}

send_packets_rx_ipv4()
{
# Send 21 packets instead of 20, because the first one might trap and go
# through the SW datapath, which might not bump the HW counter.
$MZ $h1.200 -c 21 -d 20msec -p 100 \
-a own -b $rp1mac -A 192.0.2.1 -B 192.0.2.18 \
-q -t udp sp=54321,dp=12345
}

send_packets_rx_ipv6()
{
$MZ $h1.200 -6 -c 21 -d 20msec -p 100 \
-a own -b $rp1mac -A 2001:db8:1::1 -B 2001:db8:2::1 \
-q -t udp sp=54321,dp=12345
}

send_packets_tx_ipv4()
{
$MZ $h2.200 -c 21 -d 20msec -p 100 \
-a own -b $rp2mac -A 192.0.2.18 -B 192.0.2.1 \
-q -t udp sp=54321,dp=12345
}

send_packets_tx_ipv6()
{
$MZ $h2.200 -6 -c 21 -d 20msec -p 100 \
-a own -b $rp2mac -A 2001:db8:2::1 -B 2001:db8:1::1 \
-q -t udp sp=54321,dp=12345
}

___test_stats()
{
local dir=$1; shift
local prot=$1; shift

local a
local b

a=$(get_l3_stat ${dir}.packets)
send_packets_${dir}_${prot}
"$@"
b=$(busywait "$TC_HIT_TIMEOUT" until_counter_is ">= $a + 20" \
get_l3_stat ${dir}.packets)
check_err $? "Traffic not reflected in the counter: $a -> $b"
}

__test_stats()
{
local dir=$1; shift
local prot=$1; shift

RET=0
___test_stats "$dir" "$prot"
log_test "Test $dir packets: $prot"
}

test_stats_rx_ipv4()
{
__test_stats rx ipv4
}

test_stats_tx_ipv4()
{
__test_stats tx ipv4
}

test_stats_rx_ipv6()
{
__test_stats rx ipv6
}

test_stats_tx_ipv6()
{
__test_stats tx ipv6
}

# Make sure everything works well even after stats have been disabled and
# reenabled on the same device without touching the L3 configuration.
respin_enablement()
{
log_info "Turning stats off and on again"
ip stats set dev $rp1.200 l3_stats off
ip stats set dev $rp1.200 l3_stats on
}

# For the initial run, l3_stats is enabled on a completely set up netdevice. Now
# do it the other way around: enabling the L3 stats on an L2 netdevice, and only
# then apply the L3 configuration.
reapply_config()
{
log_info "Reapplying configuration"

router_rp1_200_destroy

ip link add name $rp1.200 link $rp1 addrgenmode none type vlan id 200
ip stats set dev $rp1.200 l3_stats on
ip link set dev $rp1.200 up addrgenmode eui64
ip address add dev $rp1.200 192.0.2.2/28
ip address add dev $rp1.200 2001:db8:1::2/64
}

__test_stats_report()
{
local dir=$1; shift
local prot=$1; shift

local a
local b

RET=0

a=$(get_l3_stat ${dir}.packets)
send_packets_${dir}_${prot}
ip address flush dev $rp1.200
b=$(busywait "$TC_HIT_TIMEOUT" until_counter_is ">= $a + 20" \
get_l3_stat ${dir}.packets)
check_err $? "Traffic not reflected in the counter: $a -> $b"
log_test "Test ${dir} packets: stats pushed on loss of L3"

ip stats set dev $rp1.200 l3_stats off
ip link del dev $rp1.200
router_rp1_200_create
}

test_stats_report_rx()
{
__test_stats_report rx ipv4
}

test_stats_report_tx()
{
__test_stats_report tx ipv4
}

test_destroy_enabled()
{
RET=0

ip link del dev $rp1.200
router_rp1_200_create

log_test "Destroy l3_stats-enabled netdev"
}

test_double_enable()
{
RET=0
___test_stats rx ipv4 \
ip stats set dev $rp1.200 l3_stats on
log_test "Test stat retention across a spurious enablement"
}

trap cleanup EXIT

setup_prepare
setup_wait

tests_run

exit $EXIT_STATUS

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