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# SPDX-License-Identifier: GPL-2.0
humanize()
{
local speed=$1; shift
for unit in bps Kbps Mbps Gbps; do
if (($(echo "$speed < 1024" | bc))); then
break
fi
speed=$(echo "scale=1; $speed / 1024" | bc)
done
echo "$speed${unit}"
}
rate()
{
local t0=$1; shift
local t1=$1; shift
local interval=$1; shift
echo $((8 * (t1 - t0) / interval))
}
start_traffic()
{
local h_in=$1; shift # Where the traffic egresses the host
local sip=$1; shift
local dip=$1; shift
local dmac=$1; shift
$MZ $h_in -p 8000 -A $sip -B $dip -c 0 \
-a own -b $dmac -t udp -q &
sleep 1
}
stop_traffic()
{
# Suppress noise from killing mausezahn.
{ kill %% && wait %%; } 2>/dev/null
}
check_rate()
{
local rate=$1; shift
local min=$1; shift
local what=$1; shift
if ((rate > min)); then
return 0
fi
echo "$what $(humanize $ir) < $(humanize $min)" > /dev/stderr
return 1
}
measure_rate()
{
local sw_in=$1; shift # Where the traffic ingresses the switch
local host_in=$1; shift # Where it ingresses another host
local counter=$1; shift # Counter to use for measurement
local what=$1; shift
local interval=10
local i
local ret=0
# Dips in performance might cause momentary ingress rate to drop below
# 1Gbps. That wouldn't saturate egress and MC would thus get through,
# seemingly winning bandwidth on account of UC. Demand at least 2Gbps
# average ingress rate to somewhat mitigate this.
local min_ingress=2147483648
for i in {5..0}; do
local t0=$(ethtool_stats_get $host_in $counter)
local u0=$(ethtool_stats_get $sw_in $counter)
sleep $interval
local t1=$(ethtool_stats_get $host_in $counter)
local u1=$(ethtool_stats_get $sw_in $counter)
local ir=$(rate $u0 $u1 $interval)
local er=$(rate $t0 $t1 $interval)
if check_rate $ir $min_ingress "$what ingress rate"; then
break
fi
# Fail the test if we can't get the throughput.
if ((i == 0)); then
ret=1
fi
done
echo $ir $er
return $ret
}
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