tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3#
4# This test sends many small packets (size is less than cell size) through the
5# switch. A shaper is used in $swp2, so the traffic is limited there. Packets
6# are queued till they will be sent.
7#
8# The idea is to verify that the switch can handle at least 85% of maximum
9# supported descrpitors by hardware. Then, we verify that the driver configures
10# firmware to allow infinite size of egress descriptor pool, and does not use a
11# lower limitation. Increase the size of the relevant pools such that the pool's
12# size does not limit the traffic.
13
14# +-----------------------+
15# | H1 |
16# | + $h1.111 |
17# | | 192.0.2.33/28 |
18# | | |
19# | + $h1 |
20# +---|-------------------+
21# |
22# +---|-----------------------------+
23# | + $swp1 |
24# | | iPOOL1 |
25# | | |
26# | +-|------------------------+ |
27# | | + $swp1.111 | |
28# | | | |
29# | | BR1 | |
30# | | | |
31# | | + $swp2.111 | |
32# | +-|------------------------+ |
33# | | |
34# | + $swp2 |
35# | | ePOOL6 |
36# | | 1mbit |
37# +---+-----------------------------+
38# |
39# +---|-------------------+
40# | + $h2 H2 |
41# | | |
42# | + $h2.111 |
43# | 192.0.2.34/28 |
44# +-----------------------+
45#
46
47ALL_TESTS="
48 ping_ipv4
49 max_descriptors
50"
51
52lib_dir=$(dirname $0)/../../../net/forwarding
53
54NUM_NETIFS=4
55source $lib_dir/lib.sh
56source $lib_dir/devlink_lib.sh
57source mlxsw_lib.sh
58
59MAX_POOL_SIZE=$(devlink_pool_size_get)
60SHAPER_RATE=1mbit
61
62# The current TBF qdisc interface does not allow us to configure the shaper to
63# flat zero. The ASIC shaper is guaranteed to work with a granularity of
64# 200Mbps. On Spectrum-2, writing a value close to zero instead of zero works
65# well, but the performance on Spectrum-1 is unpredictable. Thus, do not run the
66# test on Spectrum-1.
67mlxsw_only_on_spectrum 2+ || exit
68
69h1_create()
70{
71 simple_if_init $h1
72
73 vlan_create $h1 111 v$h1 192.0.2.33/28
74 ip link set dev $h1.111 type vlan egress-qos-map 0:1
75}
76
77h1_destroy()
78{
79 vlan_destroy $h1 111
80
81 simple_if_fini $h1
82}
83
84h2_create()
85{
86 simple_if_init $h2
87
88 vlan_create $h2 111 v$h2 192.0.2.34/28
89}
90
91h2_destroy()
92{
93 vlan_destroy $h2 111
94
95 simple_if_fini $h2
96}
97
98switch_create()
99{
100 # pools
101 # -----
102
103 devlink_pool_size_thtype_save 1
104 devlink_pool_size_thtype_save 6
105
106 devlink_port_pool_th_save $swp1 1
107 devlink_port_pool_th_save $swp2 6
108
109 devlink_tc_bind_pool_th_save $swp1 1 ingress
110 devlink_tc_bind_pool_th_save $swp2 1 egress
111
112 devlink_pool_size_thtype_set 1 dynamic $MAX_POOL_SIZE
113 devlink_pool_size_thtype_set 6 static $MAX_POOL_SIZE
114
115 # $swp1
116 # -----
117
118 ip link set dev $swp1 up
119 vlan_create $swp1 111
120 ip link set dev $swp1.111 type vlan ingress-qos-map 0:0 1:1
121
122 devlink_port_pool_th_set $swp1 1 16
123 devlink_tc_bind_pool_th_set $swp1 1 ingress 1 16
124
125 tc qdisc replace dev $swp1 root handle 1: \
126 ets bands 8 strict 8 priomap 7 6
127 dcb buffer set dev $swp1 prio-buffer all:0 1:1
128
129 # $swp2
130 # -----
131
132 ip link set dev $swp2 up
133 vlan_create $swp2 111
134 ip link set dev $swp2.111 type vlan egress-qos-map 0:0 1:1
135
136 devlink_port_pool_th_set $swp2 6 $MAX_POOL_SIZE
137 devlink_tc_bind_pool_th_set $swp2 1 egress 6 $MAX_POOL_SIZE
138
139 tc qdisc replace dev $swp2 root handle 1: tbf rate $SHAPER_RATE \
140 burst 128K limit 500M
141 tc qdisc replace dev $swp2 parent 1:1 handle 11: \
142 ets bands 8 strict 8 priomap 7 6
143
144 # bridge
145 # ------
146
147 ip link add name br1 type bridge vlan_filtering 0
148 ip link set dev $swp1.111 master br1
149 ip link set dev br1 up
150
151 ip link set dev $swp2.111 master br1
152}
153
154switch_destroy()
155{
156 # Do this first so that we can reset the limits to values that are only
157 # valid for the original static / dynamic setting.
158 devlink_pool_size_thtype_restore 6
159 devlink_pool_size_thtype_restore 1
160
161 # bridge
162 # ------
163
164 ip link set dev $swp2.111 nomaster
165
166 ip link set dev br1 down
167 ip link set dev $swp1.111 nomaster
168 ip link del dev br1
169
170 # $swp2
171 # -----
172
173 tc qdisc del dev $swp2 parent 1:1 handle 11:
174 tc qdisc del dev $swp2 root
175
176 devlink_tc_bind_pool_th_restore $swp2 1 egress
177 devlink_port_pool_th_restore $swp2 6
178
179 vlan_destroy $swp2 111
180 ip link set dev $swp2 down
181
182 # $swp1
183 # -----
184
185 dcb buffer set dev $swp1 prio-buffer all:0
186 tc qdisc del dev $swp1 root
187
188 devlink_tc_bind_pool_th_restore $swp1 1 ingress
189 devlink_port_pool_th_restore $swp1 1
190
191 vlan_destroy $swp1 111
192 ip link set dev $swp1 down
193}
194
195setup_prepare()
196{
197 h1=${NETIFS[p1]}
198 swp1=${NETIFS[p2]}
199
200 swp2=${NETIFS[p3]}
201 h2=${NETIFS[p4]}
202
203 h2mac=$(mac_get $h2)
204
205 vrf_prepare
206
207 h1_create
208 h2_create
209 switch_create
210}
211
212cleanup()
213{
214 pre_cleanup
215
216 switch_destroy
217 h2_destroy
218 h1_destroy
219
220 vrf_cleanup
221}
222
223ping_ipv4()
224{
225 ping_test $h1 192.0.2.34 " h1->h2"
226}
227
228percentage_used()
229{
230 local num_packets=$1; shift
231 local max_packets=$1; shift
232
233 bc <<< "
234 scale=2
235 100 * $num_packets / $max_packets
236 "
237}
238
239max_descriptors()
240{
241 local cell_size=$(devlink_cell_size_get)
242 local exp_perc_used=85
243 local max_descriptors
244 local pktsize=30
245
246 RET=0
247
248 max_descriptors=$(mlxsw_max_descriptors_get) || exit 1
249
250 local d0=$(ethtool_stats_get $swp2 tc_no_buffer_discard_uc_tc_1)
251
252 log_info "Send many small packets, packet size = $pktsize bytes"
253 start_traffic_pktsize $pktsize $h1.111 192.0.2.33 192.0.2.34 $h2mac
254
255 # Sleep to wait for congestion.
256 sleep 5
257
258 local d1=$(ethtool_stats_get $swp2 tc_no_buffer_discard_uc_tc_1)
259 ((d1 == d0))
260 check_err $? "Drops seen on egress port: $d0 -> $d1 ($((d1 - d0)))"
261
262 # Check how many packets the switch can handle, the limitation is
263 # maximum descriptors.
264 local pkts_bytes=$(ethtool_stats_get $swp2 tc_transmit_queue_tc_1)
265 local pkts_num=$((pkts_bytes / cell_size))
266 local perc_used=$(percentage_used $pkts_num $max_descriptors)
267
268 check_err $(bc <<< "$perc_used < $exp_perc_used") \
269 "Expected > $exp_perc_used% of descriptors, handle $perc_used%"
270
271 stop_traffic
272 sleep 1
273
274 log_test "Maximum descriptors usage. The percentage used is $perc_used%"
275}
276
277trap cleanup EXIT
278setup_prepare
279setup_wait
280tests_run
281
282exit $EXIT_STATUS