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

   1 # SPDX-License-Identifier: GPL-2.0
   2
   3 check_rate()
   4 {
   5         local rate=$1; shift
   6         local min=$1; shift
   7         local what=$1; shift
   8
   9         if ((rate > min)); then
  10                 return 0
  11         fi
  12
  13         echo "$what $(humanize $ir) < $(humanize $min)" > /dev/stderr
  14         return 1
  15 }
  16
  17 measure_rate()
  18 {
  19         local sw_in=$1; shift   # Where the traffic ingresses the switch
  20         local host_in=$1; shift # Where it ingresses another host
  21         local counter=$1; shift # Counter to use for measurement
  22         local what=$1; shift
  23
  24         local interval=10
  25         local i
  26         local ret=0
  27
  28         # Dips in performance might cause momentary ingress rate to drop below
  29         # 1Gbps. That wouldn't saturate egress and MC would thus get through,
  30         # seemingly winning bandwidth on account of UC. Demand at least 2Gbps
  31         # average ingress rate to somewhat mitigate this.
  32         local min_ingress=2147483648
  33
  34         for i in {5..0}; do
  35                 local t0=$(ethtool_stats_get $host_in $counter)
  36                 local u0=$(ethtool_stats_get $sw_in $counter)
  37                 sleep $interval
  38                 local t1=$(ethtool_stats_get $host_in $counter)
  39                 local u1=$(ethtool_stats_get $sw_in $counter)
  40
  41                 local ir=$(rate $u0 $u1 $interval)
  42                 local er=$(rate $t0 $t1 $interval)
  43
  44                 if check_rate $ir $min_ingress "$what ingress rate"; then
  45                         break
  46                 fi
  47
  48                 # Fail the test if we can't get the throughput.
  49                 if ((i == 0)); then
  50                         ret=1
  51                 fi
  52         done
  53
  54         echo $ir $er
  55         return $ret
  56 }
  57
  58 bail_on_lldpad()
  59 {
  60         if systemctl is-active --quiet lldpad; then
  61
  62                 cat >/dev/stderr <<-EOF
  63                 WARNING: lldpad is running
  64
  65                         lldpad will likely configure DCB, and this test will
  66                         configure Qdiscs. mlxsw does not support both at the
  67                         same time, one of them is arbitrarily going to overwrite
  68                         the other. That will cause spurious failures (or,
  69                         unlikely, passes) of this test.
  70                 EOF
  71
  72                 if [[ -z $ALLOW_LLDPAD ]]; then
  73                         cat >/dev/stderr <<-EOF
  74
  75                                 If you want to run the test anyway, please set
  76                                 an environment variable ALLOW_LLDPAD to a
  77                                 non-empty string.
  78                         EOF
  79                         exit 1
  80                 else
  81                         return
  82                 fi
  83         fi
  84 }
  85
  86 __mlnx_qos()
  87 {
  88         local err
  89
  90         mlnx_qos "$@" 2>/dev/null
  91         err=$?
  92
  93         if ((err)); then
  94                 echo "Error ($err) in mlnx_qos $@" >/dev/stderr
  95         fi
  96
  97         return $err
  98 }