1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3# 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. 7# 8# - the stream first ingresses through $swp1, where it is forwarded to $swp3 9# 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. 14# 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. 18# 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. 23# 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. 27# 28# - it should all play out relatively quickly, so that SLL and HLL will not 29# cause drops. 30# 31# +-----------------------+ 32# | H1 | 33# | + $h1.111 | 34# | | 192.0.2.33/28 | 35# | | | 36# | + $h1 | 37# +---|-------------------+ +--------------------+ 38# | | | 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 | | 47# | | | | | | 48# | | BR1 | | BR2 | | 49# | | | | | | 50# | | | | + $swp2.111 | | 51# | +--------------------------+ +---------|----------------+ | 52# | | | 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# +-------------------------------------------------------|-------------------+ 60# | 61# +---|-------------------+ 62# | + $h2 H2 | 63# | | | 64# | + $h2.111 | 65# | 192.0.2.34/28 | 66# +-----------------------+ 67# 68# iPOOL0+ePOOL4 is a helper pool for control traffic etc. 69# iPOOL1+ePOOL5 are overflow pools. 70# iPOOL2+ePOOL6 are PFC pools. 71 72ALL_TESTS=" 73 ping_ipv4 74 test_qos_pfc 75" 76 77lib_dir=$(dirname $0)/../../../net/forwarding 78 79NUM_NETIFS=6 80source $lib_dir/lib.sh 81source $lib_dir/devlink_lib.sh 82 83_1KB=1000 84_100KB=$((100 * _1KB)) 85_500KB=$((500 * _1KB)) 86_1MB=$((1000 * _1KB)) 87_10MB=$((10 * _1MB)) 88 89h1_create() 90{ 91 simple_if_init $h1 92 mtu_set $h1 10000 93 94 vlan_create $h1 111 v$h1 192.0.2.33/28 95} 96 97h1_destroy() 98{ 99 vlan_destroy $h1 111 100 101 mtu_restore $h1 102 simple_if_fini $h1 103} 104 105h2_create() 106{ 107 simple_if_init $h2 108 mtu_set $h2 10000 109 110 vlan_create $h2 111 v$h2 192.0.2.34/28 111} 112 113h2_destroy() 114{ 115 vlan_destroy $h2 111 116 117 mtu_restore $h2 118 simple_if_fini $h2 119} 120 121switch_create() 122{ 123 # pools 124 # ----- 125 126 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 6 132 133 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 2 137 138 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 142 143 # 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 147 148 # Overflow pools. 149 devlink_pool_size_thtype_set 1 static $_10MB 150 devlink_pool_size_thtype_set 5 static $_10MB 151 152 # 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 157 158 # $swp1 159 # ----- 160 161 ip link set dev $swp1 up 162 mtu_set $swp1 10000 163 vlan_create $swp1 111 164 ip link set dev $swp1.111 type vlan ingress-qos-map 0:0 1:1 165 166 devlink_port_pool_th_set $swp1 1 $_10MB 167 devlink_tc_bind_pool_th_set $swp1 1 ingress 1 $_10MB 168 169 # Configure qdisc so that we can configure PG and therefore pool 170 # assignment. 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 1:1 174 175 # $swp2 176 # ----- 177 178 ip link set dev $swp2 up 179 mtu_set $swp2 10000 180 vlan_create $swp2 111 181 ip link set dev $swp2.111 type vlan egress-qos-map 0:0 1:1 182 183 devlink_port_pool_th_set $swp2 6 $_10MB 184 devlink_tc_bind_pool_th_set $swp2 1 egress 6 $_10MB 185 186 # 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 191 192 # $swp3 193 # ----- 194 195 ip link set dev $swp3 up 196 mtu_set $swp3 10000 197 vlan_create $swp3 111 198 ip link set dev $swp3.111 type vlan egress-qos-map 0:0 1:1 199 200 devlink_port_pool_th_set $swp3 5 $_10MB 201 devlink_tc_bind_pool_th_set $swp3 1 egress 5 $_10MB 202 203 # 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 6 206 207 # 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" 210 # direction. 211 dcb buffer set dev $swp3 prio-buffer all:0 1:1 212 dcb pfc set dev $swp3 prio-pfc all:off 1:on 213 214 # $swp4 215 # ----- 216 217 ip link set dev $swp4 up 218 mtu_set $swp4 10000 219 vlan_create $swp4 111 220 ip link set dev $swp4.111 type vlan ingress-qos-map 0:0 1:1 221 222 devlink_port_pool_th_set $swp4 2 $_1MB 223 devlink_tc_bind_pool_th_set $swp4 1 ingress 2 $_1MB 224 225 # 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 233 234 # bridges 235 # ------- 236 237 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 241 242 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 246} 247 248switch_destroy() 249{ 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 0 258 259 # bridges 260 # ------- 261 262 ip link set dev br2 down 263 ip link set dev $swp4.111 nomaster 264 ip link set dev $swp2.111 nomaster 265 ip link del dev br2 266 267 ip link set dev br1 down 268 ip link set dev $swp3.111 nomaster 269 ip link set dev $swp1.111 nomaster 270 ip link del dev br1 271 272 # $swp4 273 # ----- 274 275 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 279 280 devlink_tc_bind_pool_th_restore $swp4 1 ingress 281 devlink_port_pool_th_restore $swp4 2 282 283 vlan_destroy $swp4 111 284 mtu_restore $swp4 285 ip link set dev $swp4 down 286 287 # $swp3 288 # ----- 289 290 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 293 294 devlink_tc_bind_pool_th_restore $swp3 1 egress 295 devlink_port_pool_th_restore $swp3 5 296 297 vlan_destroy $swp3 111 298 mtu_restore $swp3 299 ip link set dev $swp3 down 300 301 # $swp2 302 # ----- 303 304 tc qdisc del dev $swp2 parent 1:7 305 tc qdisc del dev $swp2 root 306 307 devlink_tc_bind_pool_th_restore $swp2 1 egress 308 devlink_port_pool_th_restore $swp2 6 309 310 vlan_destroy $swp2 111 311 mtu_restore $swp2 312 ip link set dev $swp2 down 313 314 # $swp1 315 # ----- 316 317 dcb buffer set dev $swp1 prio-buffer all:0 318 tc qdisc del dev $swp1 root 319 320 devlink_tc_bind_pool_th_restore $swp1 1 ingress 321 devlink_port_pool_th_restore $swp1 1 322 323 vlan_destroy $swp1 111 324 mtu_restore $swp1 325 ip link set dev $swp1 down 326} 327 328setup_prepare() 329{ 330 h1=${NETIFS[p1]} 331 swp1=${NETIFS[p2]} 332 333 swp2=${NETIFS[p3]} 334 h2=${NETIFS[p4]} 335 336 swp3=${NETIFS[p5]} 337 swp4=${NETIFS[p6]} 338 339 h2mac=$(mac_get $h2) 340 341 vrf_prepare 342 343 h1_create 344 h2_create 345 switch_create 346} 347 348cleanup() 349{ 350 pre_cleanup 351 352 switch_destroy 353 h2_destroy 354 h1_destroy 355 356 vrf_cleanup 357} 358 359ping_ipv4() 360{ 361 ping_test $h1 192.0.2.34 362} 363 364test_qos_pfc() 365{ 366 RET=0 367 368 # 10M pool, each packet is 8K of payload + headers 369 local pkts=$((_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) 373 374 $MZ $h1 -p 8000 -Q 1:111 -A 192.0.2.33 -B 192.0.2.34 \ 375 -a own -b $h2mac -c $pkts -t udp -q 376 sleep 2 377 378 local in1=$(ethtool_stats_get $swp1 rx_octets_prio_1) 379 local out1=$(ethtool_stats_get $swp2 tx_octets_prio_1) 380 381 local din=$((in1 - in0)) 382 local dout=$((out1 - out0)) 383 384 local pct_in=$((din * 100 / size)) 385 386 ((pct_in > 95 && pct_in < 105)) 387 check_err $? "Relative ingress out of expected bounds, $pct_in% should be 100%" 388 389 ((dout == din)) 390 check_err $? "$((din - dout)) bytes out of $din ingressed got lost" 391 392 log_test "PFC" 393} 394 395bail_on_lldpad "configure DCB" "configure Qdiscs" 396 397trap cleanup EXIT 398setup_prepare 399setup_wait 400tests_run 401 402exit $EXIT_STATUS 403