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selftests: mlxsw: Add a PFC test

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Add a test for PFC. Runs 10MB of traffic through a bottleneck and checks
that none of it gets lost.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2020-09-30 12:49:12 +02:00 committed by David S. Miller
parent a65cc53a0e
commit bfa804784e
1 changed files with 403 additions and 0 deletions
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tools/testing/selftests/drivers/net/mlxsw/qos_pfc.sh Executable file
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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# This test injects a 10-MB burst of traffic with VLAN tag and 802.1p priority
# of 1. This stream is consistently prioritized as priority 1, is put to PG
# buffer 1, and scheduled at TC 1.
#
# - the stream first ingresses through $swp1, where it is forwarded to $swp3
#
# - then it ingresses through $swp4. Here it is put to a lossless buffer and put
# to a small pool ("PFC pool"). The traffic is forwarded to $swp2, which is
# shaped, and thus the PFC pool eventually fills, therefore the headroom
# fills, and $swp3 is paused.
#
# - since $swp3 now can't send traffic, the traffic ingressing $swp1 is kept at
# a pool ("overflow pool"). The overflow pool needs to be large enough to
# contain the whole burst.
#
# - eventually the PFC pool gets some traffic out, headroom therefore gets some
# traffic to the pool, and $swp3 is unpaused again. This way the traffic is
# gradually forwarded from the overflow pool, through the PFC pool, out of
# $swp2, and eventually to $h2.
#
# - if PFC works, all lossless flow packets that ingress through $swp1 should
# also be seen ingressing $h2. If it doesn't, there will be drops due to
# discrepancy between the speeds of $swp1 and $h2.
#
# - it should all play out relatively quickly, so that SLL and HLL will not
# cause drops.
#
# +-----------------------+
# | H1 |
# | + $h1.111 |
# | | 192.0.2.33/28 |
# | | |
# | + $h1 |
# +---|-------------------+ +--------------------+
# | | |
# +---|----------------------|--------------------|---------------------------+
# | + $swp1 $swp3 + + $swp4 |
# | | iPOOL1 iPOOL0 | | iPOOL2 |
# | | ePOOL4 ePOOL5 | | ePOOL4 |
# | | 1Gbps | | 1Gbps |
# | | PFC:enabled=1 | | PFC:enabled=1 |
# | +-|----------------------|-+ +-|------------------------+ |
# | | + $swp1.111 $swp3.111 + | | + $swp4.111 | |
# | | | | | |
# | | BR1 | | BR2 | |
# | | | | | |
# | | | | + $swp2.111 | |
# | +--------------------------+ +---------|----------------+ |
# | | |
# | iPOOL0: 500KB dynamic | |
# | iPOOL1: 10MB static | |
# | iPOOL2: 1MB static + $swp2 |
# | ePOOL4: 500KB dynamic | iPOOL0 |
# | ePOOL5: 10MB static | ePOOL6 |
# | ePOOL6: "infinite" static | 200Mbps shaper |
# +-------------------------------------------------------|-------------------+
# |
# +---|-------------------+
# | + $h2 H2 |
# | | |
# | + $h2.111 |
# | 192.0.2.34/28 |
# +-----------------------+
#
# iPOOL0+ePOOL4 is a helper pool for control traffic etc.
# iPOOL1+ePOOL5 are overflow pools.
# iPOOL2+ePOOL6 are PFC pools.
ALL_TESTS="
ping_ipv4
test_qos_pfc
"
lib_dir=$(dirname $0)/../../../net/forwarding
NUM_NETIFS=6
source $lib_dir/lib.sh
source $lib_dir/devlink_lib.sh
source qos_lib.sh
_1KB=1000
_100KB=$((100 * _1KB))
_500KB=$((500 * _1KB))
_1MB=$((1000 * _1KB))
_10MB=$((10 * _1MB))
h1_create()
{
simple_if_init $h1
mtu_set $h1 10000
vlan_create $h1 111 v$h1 192.0.2.33/28
}
h1_destroy()
{
vlan_destroy $h1 111
mtu_restore $h1
simple_if_fini $h1
}
h2_create()
{
simple_if_init $h2
mtu_set $h2 10000
vlan_create $h2 111 v$h2 192.0.2.34/28
}
h2_destroy()
{
vlan_destroy $h2 111
mtu_restore $h2
simple_if_fini $h2
}
switch_create()
{
# pools
# -----
devlink_pool_size_thtype_save 0
devlink_pool_size_thtype_save 4
devlink_pool_size_thtype_save 1
devlink_pool_size_thtype_save 5
devlink_pool_size_thtype_save 2
devlink_pool_size_thtype_save 6
devlink_port_pool_th_save $swp1 1
devlink_port_pool_th_save $swp2 6
devlink_port_pool_th_save $swp3 5
devlink_port_pool_th_save $swp4 2
devlink_tc_bind_pool_th_save $swp1 1 ingress
devlink_tc_bind_pool_th_save $swp2 1 egress
devlink_tc_bind_pool_th_save $swp3 1 egress
devlink_tc_bind_pool_th_save $swp4 1 ingress
# Control traffic pools. Just reduce the size. Keep them dynamic so that
# we don't need to change all the uninteresting quotas.
devlink_pool_size_thtype_set 0 dynamic $_500KB
devlink_pool_size_thtype_set 4 dynamic $_500KB
# Overflow pools.
devlink_pool_size_thtype_set 1 static $_10MB
devlink_pool_size_thtype_set 5 static $_10MB
# PFC pools. As per the writ, the size of egress PFC pool should be
# infinice, but actually it just needs to be large enough to not matter
# in practice, so reuse the 10MB limit.
devlink_pool_size_thtype_set 2 static $_1MB
devlink_pool_size_thtype_set 6 static $_10MB
# $swp1
# -----
ip link set dev $swp1 up
mtu_set $swp1 10000
vlan_create $swp1 111
ip link set dev $swp1.111 type vlan ingress-qos-map 0:0 1:1
devlink_port_pool_th_set $swp1 1 $_10MB
devlink_tc_bind_pool_th_set $swp1 1 ingress 1 $_10MB
# Configure qdisc so that we can configure PG and therefore pool
# assignment.
tc qdisc replace dev $swp1 root handle 1: \
ets bands 8 strict 8 priomap 7 6
__mlnx_qos -i $swp1 --prio2buffer=0,1,0,0,0,0,0,0 >/dev/null
# $swp2
# -----
ip link set dev $swp2 up
mtu_set $swp2 10000
vlan_create $swp2 111
ip link set dev $swp2.111 type vlan egress-qos-map 0:0 1:1
devlink_port_pool_th_set $swp2 6 $_10MB
devlink_tc_bind_pool_th_set $swp2 1 egress 6 $_10MB
# prio 0->TC0 (band 7), 1->TC1 (band 6). TC1 is shaped.
tc qdisc replace dev $swp2 root handle 1: \
ets bands 8 strict 8 priomap 7 6
tc qdisc replace dev $swp2 parent 1:7 handle 17: \
tbf rate 200Mbit burst 131072 limit 1M
# $swp3
# -----
ip link set dev $swp3 up
mtu_set $swp3 10000
vlan_create $swp3 111
ip link set dev $swp3.111 type vlan egress-qos-map 0:0 1:1
devlink_port_pool_th_set $swp3 5 $_10MB
devlink_tc_bind_pool_th_set $swp3 1 egress 5 $_10MB
# prio 0->TC0 (band 7), 1->TC1 (band 6)
tc qdisc replace dev $swp3 root handle 1: \
ets bands 8 strict 8 priomap 7 6
# Need to enable PFC so that PAUSE takes effect. Therefore need to put
# the lossless prio into a buffer of its own. Don't bother with buffer
# sizes though, there is not going to be any pressure in the "backward"
# direction.
__mlnx_qos -i $swp3 --prio2buffer=0,1,0,0,0,0,0,0 >/dev/null
__mlnx_qos -i $swp3 --pfc=0,1,0,0,0,0,0,0 >/dev/null
# $swp4
# -----
ip link set dev $swp4 up
mtu_set $swp4 10000
vlan_create $swp4 111
ip link set dev $swp4.111 type vlan ingress-qos-map 0:0 1:1
devlink_port_pool_th_set $swp4 2 $_1MB
devlink_tc_bind_pool_th_set $swp4 1 ingress 2 $_1MB
# Configure qdisc so that we can hand-tune headroom.
tc qdisc replace dev $swp4 root handle 1: \
ets bands 8 strict 8 priomap 7 6
__mlnx_qos -i $swp4 --prio2buffer=0,1,0,0,0,0,0,0 >/dev/null
__mlnx_qos -i $swp4 --pfc=0,1,0,0,0,0,0,0 >/dev/null
# PG0 will get autoconfigured to Xoff, give PG1 arbitrarily 100K, which
# is (-2*MTU) about 80K of delay provision.
__mlnx_qos -i $swp3 --buffer_size=0,$_100KB,0,0,0,0,0,0 >/dev/null
# bridges
# -------
ip link add name br1 type bridge vlan_filtering 0
ip link set dev $swp1.111 master br1
ip link set dev $swp3.111 master br1
ip link set dev br1 up
ip link add name br2 type bridge vlan_filtering 0
ip link set dev $swp2.111 master br2
ip link set dev $swp4.111 master br2
ip link set dev br2 up
}
switch_destroy()
{
# Do this first so that we can reset the limits to values that are only
# valid for the original static / dynamic setting.
devlink_pool_size_thtype_restore 6
devlink_pool_size_thtype_restore 5
devlink_pool_size_thtype_restore 4
devlink_pool_size_thtype_restore 2
devlink_pool_size_thtype_restore 1
devlink_pool_size_thtype_restore 0
# bridges
# -------
ip link set dev br2 down
ip link set dev $swp4.111 nomaster
ip link set dev $swp2.111 nomaster
ip link del dev br2
ip link set dev br1 down
ip link set dev $swp3.111 nomaster
ip link set dev $swp1.111 nomaster
ip link del dev br1
# $swp4
# -----
__mlnx_qos -i $swp4 --buffer_size=0,0,0,0,0,0,0,0 >/dev/null
__mlnx_qos -i $swp4 --pfc=0,0,0,0,0,0,0,0 >/dev/null
__mlnx_qos -i $swp4 --prio2buffer=0,0,0,0,0,0,0,0 >/dev/null
tc qdisc del dev $swp4 root
devlink_tc_bind_pool_th_restore $swp4 1 ingress
devlink_port_pool_th_restore $swp4 2
vlan_destroy $swp4 111
mtu_restore $swp4
ip link set dev $swp4 down
# $swp3
# -----
__mlnx_qos -i $swp3 --pfc=0,0,0,0,0,0,0,0 >/dev/null
__mlnx_qos -i $swp3 --prio2buffer=0,0,0,0,0,0,0,0 >/dev/null
tc qdisc del dev $swp3 root
devlink_tc_bind_pool_th_restore $swp3 1 egress
devlink_port_pool_th_restore $swp3 5
vlan_destroy $swp3 111
mtu_restore $swp3
ip link set dev $swp3 down
# $swp2
# -----
tc qdisc del dev $swp2 parent 1:7
tc qdisc del dev $swp2 root
devlink_tc_bind_pool_th_restore $swp2 1 egress
devlink_port_pool_th_restore $swp2 6
vlan_destroy $swp2 111
mtu_restore $swp2
ip link set dev $swp2 down
# $swp1
# -----
__mlnx_qos -i $swp1 --prio2buffer=0,0,0,0,0,0,0,0 >/dev/null
tc qdisc del dev $swp1 root
devlink_tc_bind_pool_th_restore $swp1 1 ingress
devlink_port_pool_th_restore $swp1 1
vlan_destroy $swp1 111
mtu_restore $swp1
ip link set dev $swp1 down
}
setup_prepare()
{
h1=${NETIFS[p1]}
swp1=${NETIFS[p2]}
swp2=${NETIFS[p3]}
h2=${NETIFS[p4]}
swp3=${NETIFS[p5]}
swp4=${NETIFS[p6]}
h2mac=$(mac_get $h2)
vrf_prepare
h1_create
h2_create
switch_create
}
cleanup()
{
pre_cleanup
switch_destroy
h2_destroy
h1_destroy
vrf_cleanup
}
ping_ipv4()
{
ping_test $h1 192.0.2.34
}
test_qos_pfc()
{
RET=0
# 10M pool, each packet is 8K of payload + headers
local pkts=$((_10MB / 8050))
local size=$((pkts * 8050))
local in0=$(ethtool_stats_get $swp1 rx_octets_prio_1)
local out0=$(ethtool_stats_get $swp2 tx_octets_prio_1)
$MZ $h1 -p 8000 -Q 1:111 -A 192.0.2.33 -B 192.0.2.34 \
-a own -b $h2mac -c $pkts -t udp -q
sleep 2
local in1=$(ethtool_stats_get $swp1 rx_octets_prio_1)
local out1=$(ethtool_stats_get $swp2 tx_octets_prio_1)
local din=$((in1 - in0))
local dout=$((out1 - out0))
local pct_in=$((din * 100 / size))
((pct_in > 95 && pct_in < 105))
check_err $? "Relative ingress out of expected bounds, $pct_in% should be 100%"
((dout == din))
check_err $? "$((din - dout)) bytes out of $din ingressed got lost"
log_test "PFC"
}
trap cleanup EXIT
bail_on_lldpad
setup_prepare
setup_wait
tests_run
exit $EXIT_STATUS