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xps_setup.sh
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xps_setup.sh
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#!/bin/bash
#
function usage() {
echo "Change setting of XPS txq to CPU mapping via files"
echo " /sys/class/net/DEV/queues/tx-*/xps_cpus "
echo ""
echo "Usage: $0 [-h] --dev ethX --txq N --cpu N"
echo " -d | --dev : (\$DEV) Interface/device (required)"
echo " --default : (\$DEFAULT) Setup 1:1 mapping TXQ-to-CPU"
echo " --disable : (\$DISABLE) Disable XPS via mask 0x00"
echo " --list : (\$LIST) List current setting"
echo " --txq N : (\$TXQ) Select TXQ"
echo " --cpu N : (\$CPU) Select CPU that use TXQ"
echo " -v | --verbose : (\$VERBOSE) verbose"
echo ""
}
## -- General shell logging cmds --
function err() {
local exitcode=$1
shift
echo -e "ERROR: $@" >&2
exit $exitcode
}
function info() {
if [[ -n "$VERBOSE" ]]; then
echo "# $@"
fi
}
# Convert a mask to a list of CPUs this cover
function mask_to_cpus() {
local mask=$1
local cpu=0
printf "CPUs in MASK=0x%02X =>" $mask
if [[ $mask == 0 ]]; then
echo " disabled"
fi
while [ $mask -gt 0 ]; do
if [[ $((mask & 1)) -eq 1 ]]; then
echo -n " cpu:$cpu"
fi
let cpu++
let mask=$((mask >> 1))
done
}
function sorted_txq_xps_cpus() {
local queues=$(ls /sys/class/net/$DEV/queues/tx-*/xps_cpus | sort --field-separator='-' -k2n)
echo $queues
}
function list_xps_setup() {
local txq=0
local mqleaf=0
for xps_cpus in $(sorted_txq_xps_cpus); do
let mqleaf++
mask=$(cat $xps_cpus)
value=$((0x$mask))
#echo MASK:0x$mask
txt=$(mask_to_cpus $value)
echo "NIC=$DEV TXQ:$txq (MQ-leaf :$mqleaf) use $txt"
let txq++
done
}
function cpu_to_mask() {
local cpu=$1
printf "%X" $((1 << $cpu))
}
# Setup TXQ to only use a single specific CPU
function xps_txq_to_cpu() {
local txq=$1
local cpu=$2
local mask=0
if [[ "$DISABLE" != "yes" ]]; then
mask=$(cpu_to_mask $cpu)
fi
local txq_file=/sys/class/net/$DEV/queues/tx-$txq/xps_cpus
if [[ -e "$txq_file" ]]; then
echo $mask > $txq_file
fi
}
function xps_setup_1to1_mapping() {
local cpu=0
local txq=0
for xps_cpus in $(sorted_txq_xps_cpus); do
if [[ "$DISABLE" != "yes" ]]; then
# Map the TXQ to CPU number 1-to-1
mask=$(cpu_to_mask $cpu)
else
# Disable XPS on TXQ
mask=0
fi
echo $mask > $xps_cpus
info "NIC=$DEV TXQ:$txq use CPU $cpu (MQ-leaf :$mqleaf)"
let cpu++
let txq++
done
}
# Using external program "getopt" to get --long-options
OPTIONS=$(getopt -o ld: \
--long list,default,disable,dev:,txq:,cpu: -- "$@")
if (( $? != 0 )); then
usage
err 2 "Error calling getopt"
fi
eval set -- "$OPTIONS"
## --- Parse command line arguments / parameters ---
while true; do
case "$1" in
-d | --dev ) # device
export DEV=$2
info "Device set to: DEV=$DEV" >&2
shift 2
;;
-v | --verbose)
export VERBOSE=yes
# info "Verbose mode: VERBOSE=$VERBOSE" >&2
shift
;;
--list )
info "Listing --list" >&2
export LIST=yes
shift 1
;;
--default )
info "Setup default 1-to-1 mapping TXQ-to-CPUs" >&2
export DEFAULT=yes
shift 1
;;
--disable )
info "Disable XPS via mask 0x00" >&2
export DISABLE=yes
shift 1
;;
--txq )
export TXQ=$2
info "Selected: TXQ=$TXQ" >&2
shift 2
;;
--cpu )
export CPU=$2
info "Selected: CPU=$CPU" >&2
shift 2
;;
-- )
shift
break
;;
-h | --help )
usage;
exit 0
;;
* )
shift
break
;;
esac
done
if [ -z "$DEV" ]; then
usage
err 2 "Please specify device"
fi
if [[ -n "$TXQ" ]]; then
if [[ -z "$CPU" && -z "$DISABLE" ]]; then
err 4 "CPU also needed when giving TXQ:$TXQ (or --disable)"
fi
xps_txq_to_cpu $TXQ $CPU
fi
if [[ -n "$DEFAULT" ]]; then
xps_setup_1to1_mapping
fi
if [[ "$DISABLE" == "yes" ]]; then
if [[ -z "$DEFAULT" && -z "$TXQ" ]]; then
err 5 "Use --disable together with --default or --txq"
fi
fi
if [[ -n "$LIST" ]]; then
list_xps_setup
fi