#!/bin/bash # SPDX-License-Identifier: GPL-2.0 # # This test injects a 10-MB burst of traffic with VLAN tag and 802.1p priority # of 1. This stream is consistently prioritized as priority 1, is put to PG # buffer 1, and scheduled at TC 1. # # - the stream first ingresses through $swp1, where it is forwarded to $swp3 # # - then it ingresses through $swp4. Here it is put to a lossless buffer and put # to a small pool ("PFC pool"). The traffic is forwarded to $swp2, which is # shaped, and thus the PFC pool eventually fills, therefore the headroom # fills, and $swp3 is paused. # # - since $swp3 now can't send traffic, the traffic ingressing $swp1 is kept at # a pool ("overflow pool"). The overflow pool needs to be large enough to # contain the whole burst. # # - eventually the PFC pool gets some traffic out, headroom therefore gets some # traffic to the pool, and $swp3 is unpaused again. This way the traffic is # gradually forwarded from the overflow pool, through the PFC pool, out of # $swp2, and eventually to $h2. # # - if PFC works, all lossless flow packets that ingress through $swp1 should # also be seen ingressing $h2. If it doesn't, there will be drops due to # discrepancy between the speeds of $swp1 and $h2. # # - it should all play out relatively quickly, so that SLL and HLL will not # cause drops. # # +-----------------------+ # | H1 | # | + $h1.111 | # | | 192.0.2.33/28 | # | | | # | + $h1 | # +---|-------------------+ +--------------------+ # | | | # +---|----------------------|--------------------|---------------------------+ # | + $swp1 $swp3 + + $swp4 | # | | iPOOL1 iPOOL0 | | iPOOL2 | # | | ePOOL4 ePOOL5 | | ePOOL4 | # | | PFC:enabled=1 | | PFC:enabled=1 | # | +-|----------------------|-+ +-|------------------------+ | # | | + $swp1.111 $swp3.111 + | | + $swp4.111 | | # | | | | | | # | | BR1 | | BR2 | | # | | | | | | # | | | | + $swp2.111 | | # | +--------------------------+ +---------|----------------+ | # | | | # | iPOOL0: 500KB dynamic | | # | iPOOL1: 10MB static | | # | iPOOL2: 1MB static + $swp2 | # | ePOOL4: 500KB dynamic | iPOOL0 | # | ePOOL5: 10MB static | ePOOL6 | # | ePOOL6: "infinite" static | 200Mbps shaper | # +-------------------------------------------------------|-------------------+ # | # +---|-------------------+ # | + $h2 H2 | # | | | # | + $h2.111 | # | 192.0.2.34/28 | # +-----------------------+ # # iPOOL0+ePOOL4 is a helper pool for control traffic etc. # iPOOL1+ePOOL5 are overflow pools. # iPOOL2+ePOOL6 are PFC pools. ALL_TESTS=" ping_ipv4 test_qos_pfc " lib_dir=$(dirname $0)/../../../net/forwarding NUM_NETIFS=6 source $lib_dir/lib.sh source $lib_dir/devlink_lib.sh _1KB=1000 _100KB=$((100 * _1KB)) _500KB=$((500 * _1KB)) _1MB=$((1000 * _1KB)) _10MB=$((10 * _1MB)) h1_create() { simple_if_init $h1 mtu_set $h1 10000 vlan_create $h1 111 v$h1 192.0.2.33/28 } h1_destroy() { vlan_destroy $h1 111 mtu_restore $h1 simple_if_fini $h1 } h2_create() { simple_if_init $h2 mtu_set $h2 10000 vlan_create $h2 111 v$h2 192.0.2.34/28 } h2_destroy() { vlan_destroy $h2 111 mtu_restore $h2 simple_if_fini $h2 } switch_create() { local lanes_swp4 local pg1_size # 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_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 # Control traffic pools. Just reduce the size. Keep them dynamic so that # we don't need to change all the uninteresting quotas. devlink_pool_size_thtype_set 0 dynamic $_500KB devlink_pool_size_thtype_set 4 dynamic $_500KB # Overflow pools. devlink_pool_size_thtype_set 1 static $_10MB devlink_pool_size_thtype_set 5 static $_10MB # PFC pools. As per the writ, the size of egress PFC pool should be # infinice, but actually it just needs to be large enough to not matter # in practice, so reuse the 10MB limit. devlink_pool_size_thtype_set 2 static $_1MB devlink_pool_size_thtype_set 6 static $_10MB # $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 $_10MB devlink_tc_bind_pool_th_set $swp1 1 ingress 1 $_10MB # Configure qdisc so that we can configure PG and therefore pool # assignment. tc qdisc replace dev $swp1 root handle 1: \ ets bands 8 strict 8 priomap 7 6 dcb buffer set dev $swp1 prio-buffer all:0 1:1 # $swp2 # ----- ip link set dev $swp2 up mtu_set $swp2 10000 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 $_10MB devlink_tc_bind_pool_th_set $swp2 1 egress 6 $_10MB # prio 0->TC0 (band 7), 1->TC1 (band 6). TC1 is shaped. tc qdisc replace dev $swp2 root handle 1: \ ets bands 8 strict 8 priomap 7 6 tc qdisc replace dev $swp2 parent 1:7 handle 17: \ tbf rate 200Mbit burst 131072 limit 1M # $swp3 # ----- ip link set dev $swp3 up mtu_set $swp3 10000 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 $_10MB devlink_tc_bind_pool_th_set $swp3 1 egress 5 $_10MB # 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 # Need to enable PFC so that PAUSE takes effect. Therefore need to put # the lossless prio into a buffer of its own. Don't bother with buffer # sizes though, there is not going to be any pressure in the "backward" # direction. dcb buffer set dev $swp3 prio-buffer all:0 1:1 dcb pfc set dev $swp3 prio-pfc all:off 1:on # $swp4 # ----- ip link set dev $swp4 up mtu_set $swp4 10000 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 $_1MB devlink_tc_bind_pool_th_set $swp4 1 ingress 2 $_1MB # Configure qdisc so that we can hand-tune headroom. tc qdisc replace dev $swp4 root handle 1: \ ets bands 8 strict 8 priomap 7 6 dcb buffer set dev $swp4 prio-buffer all:0 1:1 dcb pfc set dev $swp4 prio-pfc all:off 1:on # PG0 will get autoconfigured to Xoff, give PG1 arbitrarily 100K, which # is (-2*MTU) about 80K of delay provision. pg1_size=$_100KB setup_wait_dev_with_timeout $swp4 lanes_swp4=$(ethtool $swp4 | grep 'Lanes:') lanes_swp4=${lanes_swp4#*"Lanes: "} # 8-lane ports use two buffers among which the configured buffer # is split, so double the size to get twice (20K + 80K). if [[ $lanes_swp4 -eq 8 ]]; then pg1_size=$((pg1_size * 2)) fi dcb buffer set dev $swp4 buffer-size all:0 1:$pg1_size # 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 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 $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 # $swp4 # ----- dcb buffer set dev $swp4 buffer-size all:0 dcb pfc set dev $swp4 prio-pfc all:off 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 mtu_restore $swp4 ip link set dev $swp4 down # $swp3 # ----- dcb pfc set dev $swp3 prio-pfc all:off dcb buffer set dev $swp3 prio-buffer all:0 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 mtu_restore $swp3 ip link set dev $swp3 down # $swp2 # ----- tc qdisc del dev $swp2 parent 1:7 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 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=${NETIFS[p6]} h2mac=$(mac_get $h2) vrf_prepare h1_create h2_create switch_create } cleanup() { pre_cleanup switch_destroy h2_destroy h1_destroy vrf_cleanup } ping_ipv4() { ping_test $h1 192.0.2.34 } test_qos_pfc() { RET=0 # 10M pool, each packet is 8K of payload + headers local pkts=$((_10MB / 8050)) local size=$((pkts * 8050)) local in0=$(ethtool_stats_get $swp1 rx_octets_prio_1) local out0=$(ethtool_stats_get $swp2 tx_octets_prio_1) $MZ $h1 -p 8000 -Q 1:111 -A 192.0.2.33 -B 192.0.2.34 \ -a own -b $h2mac -c $pkts -t udp -q sleep 2 local in1=$(ethtool_stats_get $swp1 rx_octets_prio_1) local out1=$(ethtool_stats_get $swp2 tx_octets_prio_1) local din=$((in1 - in0)) local dout=$((out1 - out0)) local pct_in=$((din * 100 / size)) ((pct_in > 95 && pct_in < 105)) check_err $? "Relative ingress out of expected bounds, $pct_in% should be 100%" ((dout == din)) check_err $? "$((din - dout)) bytes out of $din ingressed got lost" log_test "PFC" } bail_on_lldpad "configure DCB" "configure Qdiscs" trap cleanup EXIT setup_prepare setup_wait tests_run exit $EXIT_STATUS