tools/testing/selftests/drivers/net/mlxsw/qos_pfc.sh

   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 #                                                     |   + $h2.111           |
  65 #                                                     |     192.0.2.34/28     |
  66 #                                                     +-----------------------+
  67 #
  68 # iPOOL0+ePOOL4 is a helper pool for control traffic etc.
  69 # iPOOL1+ePOOL5 are overflow pools.
  70 # iPOOL2+ePOOL6 are PFC pools.
  71
  72 ALL_TESTS="
  73         ping_ipv4
  74         test_qos_pfc
  75 "
  76
  77 lib_dir=$(dirname $0)/../../../net/forwarding
  78
  79 NUM_NETIFS=6
  80 source $lib_dir/lib.sh
  81 source $lib_dir/devlink_lib.sh
  82 source qos_lib.sh
  83
  84 _1KB=1000
  85 _100KB=$((100 * _1KB))
  86 _500KB=$((500 * _1KB))
  87 _1MB=$((1000 * _1KB))
  88 _10MB=$((10 * _1MB))
  89
  90 h1_create()
  91 {
  92         simple_if_init $h1
  93         mtu_set $h1 10000
  94
  95         vlan_create $h1 111 v$h1 192.0.2.33/28
  96 }
  97
  98 h1_destroy()
  99 {
 100         vlan_destroy $h1 111
 101
 102         mtu_restore $h1
 103         simple_if_fini $h1
 104 }
 105
 106 h2_create()
 107 {
 108         simple_if_init $h2
 109         mtu_set $h2 10000
 110
 111         vlan_create $h2 111 v$h2 192.0.2.34/28
 112 }
 113
 114 h2_destroy()
 115 {
 116         vlan_destroy $h2 111
 117
 118         mtu_restore $h2
 119         simple_if_fini $h2
 120 }
 121
 122 switch_create()
 123 {
 124         # pools
 125         # -----
 126
 127         devlink_pool_size_thtype_save 0
 128         devlink_pool_size_thtype_save 4
 129         devlink_pool_size_thtype_save 1
 130         devlink_pool_size_thtype_save 5
 131         devlink_pool_size_thtype_save 2
 132         devlink_pool_size_thtype_save 6
 133
 134         devlink_port_pool_th_save $swp1 1
 135         devlink_port_pool_th_save $swp2 6
 136         devlink_port_pool_th_save $swp3 5
 137         devlink_port_pool_th_save $swp4 2
 138
 139         devlink_tc_bind_pool_th_save $swp1 1 ingress
 140         devlink_tc_bind_pool_th_save $swp2 1 egress
 141         devlink_tc_bind_pool_th_save $swp3 1 egress
 142         devlink_tc_bind_pool_th_save $swp4 1 ingress
 143
 144         # Control traffic pools. Just reduce the size. Keep them dynamic so that
 145         # we don't need to change all the uninteresting quotas.
 146         devlink_pool_size_thtype_set 0 dynamic $_500KB
 147         devlink_pool_size_thtype_set 4 dynamic $_500KB
 148
 149         # Overflow pools.
 150         devlink_pool_size_thtype_set 1 static $_10MB
 151         devlink_pool_size_thtype_set 5 static $_10MB
 152
 153         # PFC pools. As per the writ, the size of egress PFC pool should be
 154         # infinice, but actually it just needs to be large enough to not matter
 155         # in practice, so reuse the 10MB limit.
 156         devlink_pool_size_thtype_set 2 static $_1MB
 157         devlink_pool_size_thtype_set 6 static $_10MB
 158
 159         # $swp1
 160         # -----
 161
 162         ip link set dev $swp1 up
 163         mtu_set $swp1 10000
 164         vlan_create $swp1 111
 165         ip link set dev $swp1.111 type vlan ingress-qos-map 0:0 1:1
 166
 167         devlink_port_pool_th_set $swp1 1 $_10MB
 168         devlink_tc_bind_pool_th_set $swp1 1 ingress 1 $_10MB
 169
 170         # Configure qdisc so that we can configure PG and therefore pool
 171         # assignment.
 172         tc qdisc replace dev $swp1 root handle 1: \
 173            ets bands 8 strict 8 priomap 7 6
 174         __mlnx_qos -i $swp1 --prio2buffer=0,1,0,0,0,0,0,0 >/dev/null
 175
 176         # $swp2
 177         # -----
 178
 179         ip link set dev $swp2 up
 180         mtu_set $swp2 10000
 181         vlan_create $swp2 111
 182         ip link set dev $swp2.111 type vlan egress-qos-map 0:0 1:1
 183
 184         devlink_port_pool_th_set $swp2 6 $_10MB
 185         devlink_tc_bind_pool_th_set $swp2 1 egress 6 $_10MB
 186
 187         # prio 0->TC0 (band 7), 1->TC1 (band 6). TC1 is shaped.
 188         tc qdisc replace dev $swp2 root handle 1: \
 189            ets bands 8 strict 8 priomap 7 6
 190         tc qdisc replace dev $swp2 parent 1:7 handle 17: \
 191            tbf rate 200Mbit burst 131072 limit 1M
 192
 193         # $swp3
 194         # -----
 195
 196         ip link set dev $swp3 up
 197         mtu_set $swp3 10000
 198         vlan_create $swp3 111
 199         ip link set dev $swp3.111 type vlan egress-qos-map 0:0 1:1
 200
 201         devlink_port_pool_th_set $swp3 5 $_10MB
 202         devlink_tc_bind_pool_th_set $swp3 1 egress 5 $_10MB
 203
 204         # prio 0->TC0 (band 7), 1->TC1 (band 6)
 205         tc qdisc replace dev $swp3 root handle 1: \
 206            ets bands 8 strict 8 priomap 7 6
 207
 208         # Need to enable PFC so that PAUSE takes effect. Therefore need to put
 209         # the lossless prio into a buffer of its own. Don't bother with buffer
 210         # sizes though, there is not going to be any pressure in the "backward"
 211         # direction.
 212         __mlnx_qos -i $swp3 --prio2buffer=0,1,0,0,0,0,0,0 >/dev/null
 213         __mlnx_qos -i $swp3 --pfc=0,1,0,0,0,0,0,0 >/dev/null
 214
 215         # $swp4
 216         # -----
 217
 218         ip link set dev $swp4 up
 219         mtu_set $swp4 10000
 220         vlan_create $swp4 111
 221         ip link set dev $swp4.111 type vlan ingress-qos-map 0:0 1:1
 222
 223         devlink_port_pool_th_set $swp4 2 $_1MB
 224         devlink_tc_bind_pool_th_set $swp4 1 ingress 2 $_1MB
 225
 226         # Configure qdisc so that we can hand-tune headroom.
 227         tc qdisc replace dev $swp4 root handle 1: \
 228            ets bands 8 strict 8 priomap 7 6
 229         __mlnx_qos -i $swp4 --prio2buffer=0,1,0,0,0,0,0,0 >/dev/null
 230         __mlnx_qos -i $swp4 --pfc=0,1,0,0,0,0,0,0 >/dev/null
 231         # PG0 will get autoconfigured to Xoff, give PG1 arbitrarily 100K, which
 232         # is (-2*MTU) about 80K of delay provision.
 233         __mlnx_qos -i $swp4 --buffer_size=0,$_100KB,0,0,0,0,0,0 >/dev/null
 234
 235         # bridges
 236         # -------
 237
 238         ip link add name br1 type bridge vlan_filtering 0
 239         ip link set dev $swp1.111 master br1
 240         ip link set dev $swp3.111 master br1
 241         ip link set dev br1 up
 242
 243         ip link add name br2 type bridge vlan_filtering 0
 244         ip link set dev $swp2.111 master br2
 245         ip link set dev $swp4.111 master br2
 246         ip link set dev br2 up
 247 }
 248
 249 switch_destroy()
 250 {
 251         # Do this first so that we can reset the limits to values that are only
 252         # valid for the original static / dynamic setting.
 253         devlink_pool_size_thtype_restore 6
 254         devlink_pool_size_thtype_restore 5
 255         devlink_pool_size_thtype_restore 4
 256         devlink_pool_size_thtype_restore 2
 257         devlink_pool_size_thtype_restore 1
 258         devlink_pool_size_thtype_restore 0
 259
 260         # bridges
 261         # -------
 262
 263         ip link set dev br2 down
 264         ip link set dev $swp4.111 nomaster
 265         ip link set dev $swp2.111 nomaster
 266         ip link del dev br2
 267
 268         ip link set dev br1 down
 269         ip link set dev $swp3.111 nomaster
 270         ip link set dev $swp1.111 nomaster
 271         ip link del dev br1
 272
 273         # $swp4
 274         # -----
 275
 276         __mlnx_qos -i $swp4 --buffer_size=0,0,0,0,0,0,0,0 >/dev/null
 277         __mlnx_qos -i $swp4 --pfc=0,0,0,0,0,0,0,0 >/dev/null
 278         __mlnx_qos -i $swp4 --prio2buffer=0,0,0,0,0,0,0,0 >/dev/null
 279         tc qdisc del dev $swp4 root
 280
 281         devlink_tc_bind_pool_th_restore $swp4 1 ingress
 282         devlink_port_pool_th_restore $swp4 2
 283
 284         vlan_destroy $swp4 111
 285         mtu_restore $swp4
 286         ip link set dev $swp4 down
 287
 288         # $swp3
 289         # -----
 290
 291         __mlnx_qos -i $swp3 --pfc=0,0,0,0,0,0,0,0 >/dev/null
 292         __mlnx_qos -i $swp3 --prio2buffer=0,0,0,0,0,0,0,0 >/dev/null
 293         tc qdisc del dev $swp3 root
 294
 295         devlink_tc_bind_pool_th_restore $swp3 1 egress
 296         devlink_port_pool_th_restore $swp3 5
 297
 298         vlan_destroy $swp3 111
 299         mtu_restore $swp3
 300         ip link set dev $swp3 down
 301
 302         # $swp2
 303         # -----
 304
 305         tc qdisc del dev $swp2 parent 1:7
 306         tc qdisc del dev $swp2 root
 307
 308         devlink_tc_bind_pool_th_restore $swp2 1 egress
 309         devlink_port_pool_th_restore $swp2 6
 310
 311         vlan_destroy $swp2 111
 312         mtu_restore $swp2
 313         ip link set dev $swp2 down
 314
 315         # $swp1
 316         # -----
 317
 318         __mlnx_qos -i $swp1 --prio2buffer=0,0,0,0,0,0,0,0 >/dev/null
 319         tc qdisc del dev $swp1 root
 320
 321         devlink_tc_bind_pool_th_restore $swp1 1 ingress
 322         devlink_port_pool_th_restore $swp1 1
 323
 324         vlan_destroy $swp1 111
 325         mtu_restore $swp1
 326         ip link set dev $swp1 down
 327 }
 328
 329 setup_prepare()
 330 {
 331         h1=${NETIFS[p1]}
 332         swp1=${NETIFS[p2]}
 333
 334         swp2=${NETIFS[p3]}
 335         h2=${NETIFS[p4]}
 336
 337         swp3=${NETIFS[p5]}
 338         swp4=${NETIFS[p6]}
 339
 340         h2mac=$(mac_get $h2)
 341
 342         vrf_prepare
 343
 344         h1_create
 345         h2_create
 346         switch_create
 347 }
 348
 349 cleanup()
 350 {
 351         pre_cleanup
 352
 353         switch_destroy
 354         h2_destroy
 355         h1_destroy
 356
 357         vrf_cleanup
 358 }
 359
 360 ping_ipv4()
 361 {
 362         ping_test $h1 192.0.2.34
 363 }
 364
 365 test_qos_pfc()
 366 {
 367         RET=0
 368
 369         # 10M pool, each packet is 8K of payload + headers
 370         local pkts=$((_10MB / 8050))
 371         local size=$((pkts * 8050))
 372         local in0=$(ethtool_stats_get $swp1 rx_octets_prio_1)
 373         local out0=$(ethtool_stats_get $swp2 tx_octets_prio_1)
 374
 375         $MZ $h1 -p 8000 -Q 1:111 -A 192.0.2.33 -B 192.0.2.34 \
 376                 -a own -b $h2mac -c $pkts -t udp -q
 377         sleep 2
 378
 379         local in1=$(ethtool_stats_get $swp1 rx_octets_prio_1)
 380         local out1=$(ethtool_stats_get $swp2 tx_octets_prio_1)
 381
 382         local din=$((in1 - in0))
 383         local dout=$((out1 - out0))
 384
 385         local pct_in=$((din * 100 / size))
 386
 387         ((pct_in > 95 && pct_in < 105))
 388         check_err $? "Relative ingress out of expected bounds, $pct_in% should be 100%"
 389
 390         ((dout == din))
 391         check_err $? "$((din - dout)) bytes out of $din ingressed got lost"
 392
 393         log_test "PFC"
 394 }
 395
 396 trap cleanup EXIT
 397
 398 bail_on_lldpad
 399 setup_prepare
 400 setup_wait
 401 tests_run
 402
 403 exit $EXIT_STATUS