net/mlxsw/qos_lib.sh

0001 # SPDX-License-Identifier: GPL-2.0
0002
0003 check_rate()
0004 {
0005         local rate=$1; shift
0006         local min=$1; shift
0007         local what=$1; shift
0008
0009         if ((rate > min)); then
0010                 return 0
0011         fi
0012
0013         echo "$what $(humanize $ir) < $(humanize $min)" > /dev/stderr
0014         return 1
0015 }
0016
0017 measure_rate()
0018 {
0019         local sw_in=$1; shift   # Where the traffic ingresses the switch
0020         local host_in=$1; shift # Where it ingresses another host
0021         local counter=$1; shift # Counter to use for measurement
0022         local what=$1; shift
0023
0024         local interval=10
0025         local i
0026         local ret=0
0027
0028         # Dips in performance might cause momentary ingress rate to drop below
0029         # 1Gbps. That wouldn't saturate egress and MC would thus get through,
0030         # seemingly winning bandwidth on account of UC. Demand at least 2Gbps
0031         # average ingress rate to somewhat mitigate this.
0032         local min_ingress=2147483648
0033
0034         for i in {5..0}; do
0035                 local t0=$(ethtool_stats_get $host_in $counter)
0036                 local u0=$(ethtool_stats_get $sw_in $counter)
0037                 sleep $interval
0038                 local t1=$(ethtool_stats_get $host_in $counter)
0039                 local u1=$(ethtool_stats_get $sw_in $counter)
0040
0041                 local ir=$(rate $u0 $u1 $interval)
0042                 local er=$(rate $t0 $t1 $interval)
0043
0044                 if check_rate $ir $min_ingress "$what ingress rate"; then
0045                         break
0046                 fi
0047
0048                 # Fail the test if we can't get the throughput.
0049                 if ((i == 0)); then
0050                         ret=1
0051                 fi
0052         done
0053
0054         echo $ir $er
0055         return $ret
0056 }
0057
0058 bail_on_lldpad()
0059 {
0060         if systemctl is-active --quiet lldpad; then
0061
0062                 cat >/dev/stderr <<-EOF
0063                 WARNING: lldpad is running
0064
0065                         lldpad will likely configure DCB, and this test will
0066                         configure Qdiscs. mlxsw does not support both at the
0067                         same time, one of them is arbitrarily going to overwrite
0068                         the other. That will cause spurious failures (or,
0069                         unlikely, passes) of this test.
0070                 EOF
0071
0072                 if [[ -z $ALLOW_LLDPAD ]]; then
0073                         cat >/dev/stderr <<-EOF
0074
0075                                 If you want to run the test anyway, please set
0076                                 an environment variable ALLOW_LLDPAD to a
0077                                 non-empty string.
0078                         EOF
0079                         exit 1
0080                 else
0081                         return
0082                 fi
0083         fi
0084 }