1# SPDX-License-Identifier: GPL-2.0 2 3check_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 17measure_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