2 # SPDX-License-Identifier: GPL-2.0
4 # This test injects a 10-MB burst of traffic with VLAN tag and 802.1p priority
5 # of 1. This stream is consistently prioritized as priority 1, is put to PG
6 # buffer 1, and scheduled at TC 1.
8 # - the stream first ingresses through $swp1, where it is forwarded to $swp3
10 # - then it ingresses through $swp4. Here it is put to a lossless buffer and put
11 # to a small pool ("PFC pool"). The traffic is forwarded to $swp2, which is
12 # shaped, and thus the PFC pool eventually fills, therefore the headroom
13 # fills, and $swp3 is paused.
15 # - since $swp3 now can't send traffic, the traffic ingressing $swp1 is kept at
16 # a pool ("overflow pool"). The overflow pool needs to be large enough to
17 # contain the whole burst.
19 # - eventually the PFC pool gets some traffic out, headroom therefore gets some
20 # traffic to the pool, and $swp3 is unpaused again. This way the traffic is
21 # gradually forwarded from the overflow pool, through the PFC pool, out of
22 # $swp2, and eventually to $h2.
24 # - if PFC works, all lossless flow packets that ingress through $swp1 should
25 # also be seen ingressing $h2. If it doesn't, there will be drops due to
26 # discrepancy between the speeds of $swp1 and $h2.
28 # - it should all play out relatively quickly, so that SLL and HLL will not
31 # +-----------------------+
37 # +---|-------------------+ +--------------------+
39 # +---|----------------------|--------------------|---------------------------+
40 # | + $swp1 $swp3 + + $swp4 |
41 # | | iPOOL1 iPOOL0 | | iPOOL2 |
42 # | | ePOOL4 ePOOL5 | | ePOOL4 |
43 # | | 1Gbps | | 1Gbps |
44 # | | PFC:enabled=1 | | PFC:enabled=1 |
45 # | +-|----------------------|-+ +-|------------------------+ |
46 # | | + $swp1.111 $swp3.111 + | | + $swp4.111 | |
50 # | | | | + $swp2.111 | |
51 # | +--------------------------+ +---------|----------------+ |
53 # | iPOOL0: 500KB dynamic | |
54 # | iPOOL1: 10MB static | |
55 # | iPOOL2: 1MB static + $swp2 |
56 # | ePOOL4: 500KB dynamic | iPOOL0 |
57 # | ePOOL5: 10MB static | ePOOL6 |
58 # | ePOOL6: "infinite" static | 200Mbps shaper |
59 # +-------------------------------------------------------|-------------------+
61 # +---|-------------------+
66 # +-----------------------+
68 # iPOOL0+ePOOL4 is a helper pool for control traffic etc.
69 # iPOOL1+ePOOL5 are overflow pools.
70 # iPOOL2+ePOOL6 are PFC pools.
77 lib_dir=$(dirname $0)/../../../net/forwarding
80 source $lib_dir/lib.sh
81 source $lib_dir/devlink_lib.sh
84 _100KB=$((100 * _1KB))
85 _500KB=$((500 * _1KB))
94 vlan_create $h1 111 v$h1 192.0.2.33/28
110 vlan_create $h2 111 v$h2 192.0.2.34/28
126 devlink_pool_size_thtype_save 0
127 devlink_pool_size_thtype_save 4
128 devlink_pool_size_thtype_save 1
129 devlink_pool_size_thtype_save 5
130 devlink_pool_size_thtype_save 2
131 devlink_pool_size_thtype_save 6
133 devlink_port_pool_th_save $swp1 1
134 devlink_port_pool_th_save $swp2 6
135 devlink_port_pool_th_save $swp3 5
136 devlink_port_pool_th_save $swp4 2
138 devlink_tc_bind_pool_th_save $swp1 1 ingress
139 devlink_tc_bind_pool_th_save $swp2 1 egress
140 devlink_tc_bind_pool_th_save $swp3 1 egress
141 devlink_tc_bind_pool_th_save $swp4 1 ingress
143 # Control traffic pools. Just reduce the size. Keep them dynamic so that
144 # we don't need to change all the uninteresting quotas.
145 devlink_pool_size_thtype_set 0 dynamic $_500KB
146 devlink_pool_size_thtype_set 4 dynamic $_500KB
149 devlink_pool_size_thtype_set 1 static $_10MB
150 devlink_pool_size_thtype_set 5 static $_10MB
152 # PFC pools. As per the writ, the size of egress PFC pool should be
153 # infinice, but actually it just needs to be large enough to not matter
154 # in practice, so reuse the 10MB limit.
155 devlink_pool_size_thtype_set 2 static $_1MB
156 devlink_pool_size_thtype_set 6 static $_10MB
161 ip link set dev $swp1 up
163 vlan_create $swp1 111
164 ip link set dev $swp1.111 type vlan ingress-qos-map 0:0 1:1
166 devlink_port_pool_th_set $swp1 1 $_10MB
167 devlink_tc_bind_pool_th_set $swp1 1 ingress 1 $_10MB
169 # Configure qdisc so that we can configure PG and therefore pool
171 tc qdisc replace dev $swp1 root handle 1: \
172 ets bands 8 strict 8 priomap 7 6
173 dcb buffer set dev $swp1 prio-buffer all:0 1:1
178 ip link set dev $swp2 up
180 vlan_create $swp2 111
181 ip link set dev $swp2.111 type vlan egress-qos-map 0:0 1:1
183 devlink_port_pool_th_set $swp2 6 $_10MB
184 devlink_tc_bind_pool_th_set $swp2 1 egress 6 $_10MB
186 # prio 0->TC0 (band 7), 1->TC1 (band 6). TC1 is shaped.
187 tc qdisc replace dev $swp2 root handle 1: \
188 ets bands 8 strict 8 priomap 7 6
189 tc qdisc replace dev $swp2 parent 1:7 handle 17: \
190 tbf rate 200Mbit burst 131072 limit 1M
195 ip link set dev $swp3 up
197 vlan_create $swp3 111
198 ip link set dev $swp3.111 type vlan egress-qos-map 0:0 1:1
200 devlink_port_pool_th_set $swp3 5 $_10MB
201 devlink_tc_bind_pool_th_set $swp3 1 egress 5 $_10MB
203 # prio 0->TC0 (band 7), 1->TC1 (band 6)
204 tc qdisc replace dev $swp3 root handle 1: \
205 ets bands 8 strict 8 priomap 7 6
207 # Need to enable PFC so that PAUSE takes effect. Therefore need to put
208 # the lossless prio into a buffer of its own. Don't bother with buffer
209 # sizes though, there is not going to be any pressure in the "backward"
211 dcb buffer set dev $swp3 prio-buffer all:0 1:1
212 dcb pfc set dev $swp3 prio-pfc all:off 1:on
217 ip link set dev $swp4 up
219 vlan_create $swp4 111
220 ip link set dev $swp4.111 type vlan ingress-qos-map 0:0 1:1
222 devlink_port_pool_th_set $swp4 2 $_1MB
223 devlink_tc_bind_pool_th_set $swp4 1 ingress 2 $_1MB
225 # Configure qdisc so that we can hand-tune headroom.
226 tc qdisc replace dev $swp4 root handle 1: \
227 ets bands 8 strict 8 priomap 7 6
228 dcb buffer set dev $swp4 prio-buffer all:0 1:1
229 dcb pfc set dev $swp4 prio-pfc all:off 1:on
230 # PG0 will get autoconfigured to Xoff, give PG1 arbitrarily 100K, which
231 # is (-2*MTU) about 80K of delay provision.
232 dcb buffer set dev $swp4 buffer-size all:0 1:$_100KB
237 ip link add name br1 type bridge vlan_filtering 0
238 ip link set dev $swp1.111 master br1
239 ip link set dev $swp3.111 master br1
240 ip link set dev br1 up
242 ip link add name br2 type bridge vlan_filtering 0
243 ip link set dev $swp2.111 master br2
244 ip link set dev $swp4.111 master br2
245 ip link set dev br2 up
250 # Do this first so that we can reset the limits to values that are only
251 # valid for the original static / dynamic setting.
252 devlink_pool_size_thtype_restore 6
253 devlink_pool_size_thtype_restore 5
254 devlink_pool_size_thtype_restore 4
255 devlink_pool_size_thtype_restore 2
256 devlink_pool_size_thtype_restore 1
257 devlink_pool_size_thtype_restore 0
262 ip link set dev br2 down
263 ip link set dev $swp4.111 nomaster
264 ip link set dev $swp2.111 nomaster
267 ip link set dev br1 down
268 ip link set dev $swp3.111 nomaster
269 ip link set dev $swp1.111 nomaster
275 dcb buffer set dev $swp4 buffer-size all:0
276 dcb pfc set dev $swp4 prio-pfc all:off
277 dcb buffer set dev $swp4 prio-buffer all:0
278 tc qdisc del dev $swp4 root
280 devlink_tc_bind_pool_th_restore $swp4 1 ingress
281 devlink_port_pool_th_restore $swp4 2
283 vlan_destroy $swp4 111
285 ip link set dev $swp4 down
290 dcb pfc set dev $swp3 prio-pfc all:off
291 dcb buffer set dev $swp3 prio-buffer all:0
292 tc qdisc del dev $swp3 root
294 devlink_tc_bind_pool_th_restore $swp3 1 egress
295 devlink_port_pool_th_restore $swp3 5
297 vlan_destroy $swp3 111
299 ip link set dev $swp3 down
304 tc qdisc del dev $swp2 parent 1:7
305 tc qdisc del dev $swp2 root
307 devlink_tc_bind_pool_th_restore $swp2 1 egress
308 devlink_port_pool_th_restore $swp2 6
310 vlan_destroy $swp2 111
312 ip link set dev $swp2 down
317 dcb buffer set dev $swp1 prio-buffer all:0
318 tc qdisc del dev $swp1 root
320 devlink_tc_bind_pool_th_restore $swp1 1 ingress
321 devlink_port_pool_th_restore $swp1 1
323 vlan_destroy $swp1 111
325 ip link set dev $swp1 down
361 ping_test $h1 192.0.2.34
368 # 10M pool, each packet is 8K of payload + headers
369 local pkts=$((_10MB / 8050))
370 local size=$((pkts * 8050))
371 local in0=$(ethtool_stats_get $swp1 rx_octets_prio_1)
372 local out0=$(ethtool_stats_get $swp2 tx_octets_prio_1)
374 $MZ $h1 -p 8000 -Q 1:111 -A 192.0.2.33 -B 192.0.2.34 \
375 -a own -b $h2mac -c $pkts -t udp -q
378 local in1=$(ethtool_stats_get $swp1 rx_octets_prio_1)
379 local out1=$(ethtool_stats_get $swp2 tx_octets_prio_1)
381 local din=$((in1 - in0))
382 local dout=$((out1 - out0))
384 local pct_in=$((din * 100 / size))
386 ((pct_in > 95 && pct_in < 105))
387 check_err $? "Relative ingress out of expected bounds, $pct_in% should be 100%"
390 check_err $? "$((din - dout)) bytes out of $din ingressed got lost"
395 bail_on_lldpad "configure DCB" "configure Qdiscs"