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Brooklyn/tools/testing/selftests/drivers/net/mlxsw/qos_burst.sh
Raziel K. Crowe e9f98f07aa Torchie The Cat Source
2022-09-07 22:30:50 +05:00

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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# This test sends 1Gbps of traffic through the switch, into which it then
# injects a burst of traffic and tests that there are no drops.
#
# The 1Gbps stream is created by sending >1Gbps stream from H1. This stream
# ingresses through $swp1, and is forwarded thtrough a small temporary pool to a
# 1Gbps $swp3.
#
# Thus a 1Gbps stream enters $swp4, and is forwarded through a large pool to
# $swp2, and eventually to H2. Since $swp2 is a 1Gbps port as well, no backlog
# is generated.
#
# At this point, a burst of traffic is forwarded from H3. This enters $swp5, is
# forwarded to $swp2, which is fully subscribed by the 1Gbps stream. The
# expectation is that the burst is wholly absorbed by the large pool and no
# drops are caused. After the burst, there should be a backlog that is hard to
# get rid of, because $sw2 is fully subscribed. But because each individual
# packet is scheduled soon after getting enqueued, SLL and HLL do not impact the
# test.
#
# +-----------------------+ +-----------------------+
# | H1 | | H3 |
# | + $h1.111 | | $h3.111 + |
# | | 192.0.2.33/28 | | 192.0.2.35/28 | |
# | | | | | |
# | + $h1 | | $h3 + |
# +---|-------------------+ +--------------------+ +------------------|----+
# | | | |
# +---|----------------------|--------------------|----------------------|----+
# | + $swp1 $swp3 + + $swp4 $swp5 | |
# | | iPOOL1 iPOOL0 | | iPOOL2 iPOOL2 | |
# | | ePOOL4 ePOOL5 | | ePOOL4 ePOOL4 | |
# | | 1Gbps | | 1Gbps | |
# | +-|----------------------|-+ +-|----------------------|-+ |
# | | + $swp1.111 $swp3.111 + | | + $swp4.111 $swp5.111 + | |
# | | | | | |
# | | BR1 | | BR2 | |
# | | | | | |
# | | | | + $swp2.111 | |
# | +--------------------------+ +---------|----------------+ |
# | | |
# | iPOOL0: 500KB dynamic | |
# | iPOOL1: 500KB dynamic | |
# | iPOOL2: 10MB dynamic + $swp2 |
# | ePOOL4: 500KB dynamic | iPOOL0 |
# | ePOOL5: 500KB dnamic | ePOOL6 |
# | ePOOL6: 10MB dynamic | 1Gbps |
# +-------------------------------------------------------|-------------------+
# |
# +---|-------------------+
# | + $h2 H2 |
# | | 1Gbps |
# | | |
# | + $h2.111 |
# | 192.0.2.34/28 |
# +-----------------------+
#
# iPOOL0+ePOOL4 are helper pools for control traffic etc.
# iPOOL1+ePOOL5 are helper pools for modeling the 1Gbps stream
# iPOOL2+ePOOL6 are pools for soaking the burst traffic
ALL_TESTS="
ping_ipv4
test_8K
test_800
"
lib_dir=$(dirname $0)/../../../net/forwarding
NUM_NETIFS=8
source $lib_dir/lib.sh
source $lib_dir/devlink_lib.sh
source qos_lib.sh
source mlxsw_lib.sh
_1KB=1000
_500KB=$((500 * _1KB))
_1MB=$((1000 * _1KB))
# The failure mode that this specifically tests is exhaustion of descriptor
# buffer. The point is to produce a burst that shared buffer should be able
# to accommodate, but produce it with small enough packets that the machine
# runs out of the descriptor buffer space with default configuration.
#
# The machine therefore needs to be able to produce line rate with as small
# packets as possible, and at the same time have large enough buffer that
# when filled with these small packets, it runs out of descriptors.
# Spectrum-2 is very close, but cannot perform this test. Therefore use
# Spectrum-3 as a minimum, and permit larger burst size, and therefore
# larger packets, to reduce spurious failures.
#
mlxsw_only_on_spectrum 3+ || exit
BURST_SIZE=$((50000000))
POOL_SIZE=$BURST_SIZE
h1_create()
{
simple_if_init $h1
mtu_set $h1 10000
vlan_create $h1 111 v$h1 192.0.2.33/28
ip link set dev $h1.111 type vlan egress-qos-map 0:1
}
h1_destroy()
{
vlan_destroy $h1 111
mtu_restore $h1
simple_if_fini $h1
}
h2_create()
{
simple_if_init $h2
mtu_set $h2 10000
ethtool -s $h2 speed 1000 autoneg off
vlan_create $h2 111 v$h2 192.0.2.34/28
}
h2_destroy()
{
vlan_destroy $h2 111
ethtool -s $h2 autoneg on
mtu_restore $h2
simple_if_fini $h2
}
h3_create()
{
simple_if_init $h3
mtu_set $h3 10000
vlan_create $h3 111 v$h3 192.0.2.35/28
}
h3_destroy()
{
vlan_destroy $h3 111
mtu_restore $h3
simple_if_fini $h3
}
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_port_pool_th_save $swp5 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
devlink_tc_bind_pool_th_save $swp5 1 ingress
# Control traffic pools. Just reduce the size.
devlink_pool_size_thtype_set 0 dynamic $_500KB
devlink_pool_size_thtype_set 4 dynamic $_500KB
# Stream modeling pools.
devlink_pool_size_thtype_set 1 dynamic $_500KB
devlink_pool_size_thtype_set 5 dynamic $_500KB
# Burst soak pools.
devlink_pool_size_thtype_set 2 static $POOL_SIZE
devlink_pool_size_thtype_set 6 static $POOL_SIZE
# $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 16
devlink_tc_bind_pool_th_set $swp1 1 ingress 1 16
# Configure qdisc...
tc qdisc replace dev $swp1 root handle 1: \
ets bands 8 strict 8 priomap 7 6
# ... so that we can assign prio1 traffic to PG1.
dcb buffer set dev $swp1 prio-buffer all:0 1:1
# $swp2
# -----
ip link set dev $swp2 up
mtu_set $swp2 10000
ethtool -s $swp2 speed 1000 autoneg off
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 $POOL_SIZE
devlink_tc_bind_pool_th_set $swp2 1 egress 6 $POOL_SIZE
# prio 0->TC0 (band 7), 1->TC1 (band 6)
tc qdisc replace dev $swp2 root handle 1: \
ets bands 8 strict 8 priomap 7 6
# $swp3
# -----
ip link set dev $swp3 up
mtu_set $swp3 10000
ethtool -s $swp3 speed 1000 autoneg off
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 16
devlink_tc_bind_pool_th_set $swp3 1 egress 5 16
# 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
# $swp4
# -----
ip link set dev $swp4 up
mtu_set $swp4 10000
ethtool -s $swp4 speed 1000 autoneg off
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 $POOL_SIZE
devlink_tc_bind_pool_th_set $swp4 1 ingress 2 $POOL_SIZE
# Configure qdisc...
tc qdisc replace dev $swp4 root handle 1: \
ets bands 8 strict 8 priomap 7 6
# ... so that we can assign prio1 traffic to PG1.
dcb buffer set dev $swp4 prio-buffer all:0 1:1
# $swp5
# -----
ip link set dev $swp5 up
mtu_set $swp5 10000
vlan_create $swp5 111
ip link set dev $swp5.111 type vlan ingress-qos-map 0:0 1:1
devlink_port_pool_th_set $swp5 2 $POOL_SIZE
devlink_tc_bind_pool_th_set $swp5 1 ingress 2 $POOL_SIZE
# Configure qdisc...
tc qdisc replace dev $swp5 root handle 1: \
ets bands 8 strict 8 priomap 7 6
# ... so that we can assign prio1 traffic to PG1.
dcb buffer set dev $swp5 prio-buffer all:0 1:1
# 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 $swp5.111 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 $swp5.111 nomaster
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
# $swp5
# -----
dcb buffer set dev $swp5 prio-buffer all:0
tc qdisc del dev $swp5 root
devlink_tc_bind_pool_th_restore $swp5 1 ingress
devlink_port_pool_th_restore $swp5 2
vlan_destroy $swp5 111
mtu_restore $swp5
ip link set dev $swp5 down
# $swp4
# -----
dcb buffer set dev $swp4 prio-buffer all:0
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
ethtool -s $swp4 autoneg on
mtu_restore $swp4
ip link set dev $swp4 down
# $swp3
# -----
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
ethtool -s $swp3 autoneg on
mtu_restore $swp3
ip link set dev $swp3 down
# $swp2
# -----
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
ethtool -s $swp2 autoneg on
mtu_restore $swp2
ip link set dev $swp2 down
# $swp1
# -----
dcb buffer set dev $swp1 prio-buffer all:0
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=${NETIFS[p6]}
swp5=${NETIFS[p7]}
h3=${NETIFS[p8]}
h2mac=$(mac_get $h2)
vrf_prepare
h1_create
h2_create
h3_create
switch_create
}
cleanup()
{
pre_cleanup
switch_destroy
h3_destroy
h2_destroy
h1_destroy
vrf_cleanup
}
ping_ipv4()
{
ping_test $h1 192.0.2.34 " h1->h2"
ping_test $h3 192.0.2.34 " h3->h2"
}
__test_qos_burst()
{
local pktsize=$1; shift
RET=0
start_traffic_pktsize $pktsize $h1.111 192.0.2.33 192.0.2.34 $h2mac
sleep 1
local q0=$(ethtool_stats_get $swp2 tc_transmit_queue_tc_1)
((q0 == 0))
check_err $? "Transmit queue non-zero?"
local d0=$(ethtool_stats_get $swp2 tc_no_buffer_discard_uc_tc_1)
local cell_size=$(devlink_cell_size_get)
local cells=$((BURST_SIZE / cell_size))
# Each packet is $pktsize of payload + headers.
local pkt_cells=$(((pktsize + 50 + cell_size - 1) / cell_size))
# How many packets can we admit:
local pkts=$((cells / pkt_cells))
$MZ $h3 -p $pktsize -Q 1:111 -A 192.0.2.35 -B 192.0.2.34 \
-a own -b $h2mac -c $pkts -t udp -q
sleep 1
local d1=$(ethtool_stats_get $swp2 tc_no_buffer_discard_uc_tc_1)
((d1 == d0))
check_err $? "Drops seen on egress port: $d0 -> $d1 ($((d1 - d0)))"
# Check that the queue is somewhat close to the burst size This
# makes sure that the lack of drops above was not due to port
# undersubscribtion.
local q0=$(ethtool_stats_get $swp2 tc_transmit_queue_tc_1)
local qe=$((90 * BURST_SIZE / 100))
((q0 > qe))
check_err $? "Queue size expected >$qe, got $q0"
stop_traffic
sleep 2
log_test "Burst: absorb $pkts ${pktsize}-B packets"
}
test_8K()
{
__test_qos_burst 8000
}
test_800()
{
__test_qos_burst 800
}
bail_on_lldpad
trap cleanup EXIT
setup_prepare
setup_wait
tests_run
exit $EXIT_STATUS
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