#
# Common functions used by pktgen scripts
# - Depending on bash 3 (or higher) syntax
#
# Author: Jesper Dangaaard Brouer
# License: GPL
set -o errexit
## -- General shell logging cmds --
function err() {
local exitcode=$1
shift
echo "ERROR: $@" >&2
exit $exitcode
}
function warn() {
echo "WARN : $@" >&2
}
function info() {
if [[ -n "$VERBOSE" ]]; then
echo "INFO : $@" >&2
fi
}
## -- Pktgen proc config commands -- ##
export PROC_DIR=/proc/net/pktgen
#
# Three different shell functions for configuring the different
# components of pktgen:
# pg_ctrl(), pg_thread() and pg_set().
#
# These functions correspond to pktgens different components.
# * pg_ctrl() control "pgctrl" (/proc/net/pktgen/pgctrl)
# * pg_thread() control the kernel threads and binding to devices
# * pg_set() control setup of individual devices
function pg_ctrl() {
local proc_file="pgctrl"
proc_cmd ${proc_file} "$@"
}
function pg_thread() {
local thread=$1
local proc_file="kpktgend_${thread}"
shift
proc_cmd ${proc_file} "$@"
}
function pg_set() {
local dev=$1
local proc_file="$dev"
shift
proc_cmd ${proc_file} "$@"
}
# More generic replacement for pgset(), that does not depend on global
# variable for proc file.
function proc_cmd() {
local result
local proc_file=$1
local status=0
# after shift, the remaining args are contained in $@
shift
local proc_ctrl=${PROC_DIR}/$proc_file
if [[ ! -e "$proc_ctrl" ]]; then
err 3 "proc file:$proc_ctrl does not exists (dev added to thread?)"
else
if [[ ! -w "$proc_ctrl" ]]; then
err 4 "proc file:$proc_ctrl not writable, not root?!"
fi
fi
if [[ "$DEBUG" == "yes" ]]; then
echo "cmd: $@ > $proc_ctrl"
fi
# Quoting of "$@" is important for space expansion
echo "$@" > "$proc_ctrl" || status=$?
if [[ "$proc_file" != "pgctrl" ]]; then
result=$(grep "Result: OK:" $proc_ctrl) || true
if [[ "$result" == "" ]]; then
grep "Result:" $proc_ctrl >&2
fi
fi
if (( $status != 0 )); then
err 5 "Write error($status) occurred cmd: \"$@ > $proc_ctrl\""
fi
}
# Old obsolete "pgset" function, with slightly improved err handling
function pgset() {
local result
if [[ "$DEBUG" == "yes" ]]; then
echo "cmd: $1 > $PGDEV"
fi
echo $1 > $PGDEV
local status=$?
result=`cat $PGDEV | fgrep "Result: OK:"`
if [[ "$result" == "" ]]; then
cat $PGDEV | fgrep Result:
fi
if (( $status != 0 )); then
err 5 "Write error($status) occurred cmd: \"$1 > $PGDEV\""
fi
}
function trap_exit()
{
# Cleanup pktgen setup on exit if thats not "append mode"
if [[ -z "$APPEND" ]] && [[ $EUID -eq 0 ]]; then
trap 'pg_ctrl "reset"' EXIT
fi
}
## -- General shell tricks --
function root_check_run_with_sudo() {
# Trick so, program can be run as normal user, will just use "sudo"
# call as root_check_run_as_sudo "$@"
if [ "$EUID" -ne 0 ]; then
if [ -x $0 ]; then # Directly executable use sudo
info "Not root, running with sudo"
sudo -E "$0" "$@"
exit $?
fi
err 4 "cannot perform sudo run of $0"
fi
}
# Exact input device's NUMA node info
function get_iface_node()
{
local node=$(</sys/class/net/$1/device/numa_node)
if [[ $node == -1 ]]; then
echo 0
else
echo $node
fi
}
# Given an Dev/iface, get its queues' irq numbers
function get_iface_irqs()
{
local IFACE=$1
local queues="${IFACE}-.*TxRx"
irqs=$(grep "$queues" /proc/interrupts | cut -f1 -d:)
[ -z "$irqs" ] && irqs=$(grep $IFACE /proc/interrupts | cut -f1 -d:)
[ -z "$irqs" ] && irqs=$(for i in `ls -Ux /sys/class/net/$IFACE/device/msi_irqs` ;\
do grep "$i:.*TxRx" /proc/interrupts | grep -v fdir | cut -f 1 -d : ;\
done)
[ -z "$irqs" ] && err 3 "Could not find interrupts for $IFACE"
echo $irqs
}
# Given a NUMA node, return cpu ids belonging to it.
function get_node_cpus()
{
local node=$1
local node_cpu_list
local node_cpu_range_list=`cut -f1- -d, --output-delimiter=" " \
/sys/devices/system/node/node$node/cpulist`
for cpu_range in $node_cpu_range_list
do
node_cpu_list="$node_cpu_list "`seq -s " " ${cpu_range//-/ }`
done
echo $node_cpu_list
}
# Check $1 is in between $2, $3 ($2 <= $1 <= $3)
function in_between() { [[ ($1 -ge $2) && ($1 -le $3) ]] ; }
# Extend shrunken IPv6 address.
# fe80::42:bcff:fe84:e10a => fe80:0:0:0:42:bcff:fe84:e10a
function extend_addr6()
{
local addr=$1
local sep=: sep2=::
local sep_cnt=$(tr -cd $sep <<< $1 | wc -c)
local shrink
# separator count should be (2 <= $sep_cnt <= 7)
if ! (in_between $sep_cnt 2 7); then
err 5 "Invalid IP6 address: $1"
fi
# if shrink '::' occurs multiple, it's malformed.
shrink=( $(grep -E -o "$sep{2,}" <<< $addr) )
if [[ ${#shrink[@]} -ne 0 ]]; then
if [[ ${#shrink[@]} -gt 1 || ( ${shrink[0]} != $sep2 ) ]]; then
err 5 "Invalid IP6 address: $1"
fi
fi
# add 0 at begin & end, and extend addr by adding :0
[[ ${addr:0:1} == $sep ]] && addr=0${addr}
[[ ${addr: -1} == $sep ]] && addr=${addr}0
echo "${addr/$sep2/$(printf ':0%.s' $(seq $[8-sep_cnt])):}"
}
# Given a single IP(v4/v6) address, whether it is valid.
function validate_addr()
{
# check function is called with (funcname)6
[[ ${FUNCNAME[1]: -1} == 6 ]] && local IP6=6
local bitlen=$[ IP6 ? 128 : 32 ]
local len=$[ IP6 ? 8 : 4 ]
local max=$[ 2**(len*2)-1 ]
local net prefix
local addr sep
IFS='/' read net prefix <<< $1
[[ $IP6 ]] && net=$(extend_addr6 $net)
# if prefix exists, check (0 <= $prefix <= $bitlen)
if [[ -n $prefix ]]; then
if ! (in_between $prefix 0 $bitlen); then
err 5 "Invalid prefix: /$prefix"
fi
fi
# set separator for each IP(v4/v6)
[[ $IP6 ]] && sep=: || sep=.
IFS=$sep read -a addr <<< $net
# array length
if [[ ${#addr[@]} != $len ]]; then
err 5 "Invalid IP$IP6 address: $1"
fi
# check each digit (0 <= $digit <= $max)
for digit in "${addr[@]}"; do
[[ $IP6 ]] && digit=$[ 16#$digit ]
if ! (in_between $digit 0 $max); then
err 5 "Invalid IP$IP6 address: $1"
fi
done
return 0
}
function validate_addr6() { validate_addr $@ ; }
# Given a single IP(v4/v6) or CIDR, return minimum and maximum IP addr.
function parse_addr()
{
# check function is called with (funcname)6
[[ ${FUNCNAME[1]: -1} == 6 ]] && local IP6=6
local net prefix
local min_ip max_ip
IFS='/' read net prefix <<< $1
[[ $IP6 ]] && net=$(extend_addr6 $net)
if [[ -z $prefix ]]; then
min_ip=$net
max_ip=$net
else
# defining array for converting Decimal 2 Binary
# 00000000 00000001 00000010 00000011 00000100 ...
local d2b='{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}'
[[ $IP6 ]] && d2b+=$d2b
eval local D2B=($d2b)
local bitlen=$[ IP6 ? 128 : 32 ]
local remain=$[ bitlen-prefix ]
local octet=$[ IP6 ? 16 : 8 ]
local min_mask max_mask
local min max
local ip_bit
local ip sep
# set separator for each IP(v4/v6)
[[ $IP6 ]] && sep=: || sep=.
IFS=$sep read -ra ip <<< $net
min_mask="$(printf '1%.s' $(seq $prefix))$(printf '0%.s' $(seq $remain))"
max_mask="$(printf '0%.s' $(seq $prefix))$(printf '1%.s' $(seq $remain))"
# calculate min/max ip with &,| operator
for i in "${!ip[@]}"; do
digit=$[ IP6 ? 16#${ip[$i]} : ${ip[$i]} ]
ip_bit=${D2B[$digit]}
idx=$[ octet*i ]
min[$i]=$[ 2#$ip_bit & 2#${min_mask:$idx:$octet} ]
max[$i]=$[ 2#$ip_bit | 2#${max_mask:$idx:$octet} ]
[[ $IP6 ]] && { min[$i]=$(printf '%X' ${min[$i]});
max[$i]=$(printf '%X' ${max[$i]}); }
done
min_ip=$(IFS=$sep; echo "${min[*]}")
max_ip=$(IFS=$sep; echo "${max[*]}")
fi
echo $min_ip $max_ip
}
function parse_addr6() { parse_addr $@ ; }
# Given a single or range of port(s), return minimum and maximum port number.
function parse_ports()
{
local port_str=$1
local port_list
local min_port
local max_port
IFS="-" read -ra port_list <<< $port_str
min_port=${port_list[0]}
max_port=${port_list[1]:-$min_port}
echo $min_port $max_port
}
# Given a minimum and maximum port, verify port number.
function validate_ports()
{
local min_port=$1
local max_port=$2
# 1 <= port <= 65535
if (in_between $min_port 1 65535); then
if (in_between $max_port 1 65535); then
if [[ $min_port -le $max_port ]]; then
return 0
fi
fi
fi
err 5 "Invalid port(s): $min_port-$max_port"
}