xref: /linux/samples/pktgen/functions.sh (revision ee88f4ebe57523889fc437bc42f95d9ab89bdd9f) 
1#
2# Common functions used by pktgen scripts
3#  - Depending on bash 3 (or higher) syntax
4#
5# Author: Jesper Dangaaard Brouer
6# License: GPL
7
8set -o errexit
9
10## -- General shell logging cmds --
11function err() {
12    local exitcode=$1
13    shift
14    echo "ERROR: $@" >&2
15    exit $exitcode
16}
17
18function warn() {
19    echo "WARN : $@" >&2
20}
21
22function info() {
23    if [[ -n "$VERBOSE" ]]; then
24	echo "INFO : $@" >&2
25    fi
26}
27
28## -- Pktgen proc config commands -- ##
29export PROC_DIR=/proc/net/pktgen
30#
31# Three different shell functions for configuring the different
32# components of pktgen:
33#   pg_ctrl(), pg_thread() and pg_set().
34#
35# These functions correspond to pktgens different components.
36# * pg_ctrl()   control "pgctrl" (/proc/net/pktgen/pgctrl)
37# * pg_thread() control the kernel threads and binding to devices
38# * pg_set()    control setup of individual devices
39function pg_ctrl() {
40    local proc_file="pgctrl"
41    proc_cmd ${proc_file} "$@"
42}
43
44function pg_thread() {
45    local thread=$1
46    local proc_file="kpktgend_${thread}"
47    shift
48    proc_cmd ${proc_file} "$@"
49}
50
51function pg_set() {
52    local dev=$1
53    local proc_file="$dev"
54    shift
55    proc_cmd ${proc_file} "$@"
56}
57
58# More generic replacement for pgset(), that does not depend on global
59# variable for proc file.
60function proc_cmd() {
61    local result
62    local proc_file=$1
63    local status=0
64    # after shift, the remaining args are contained in $@
65    shift
66    local proc_ctrl=${PROC_DIR}/$proc_file
67    if [[ ! -e "$proc_ctrl" ]]; then
68	err 3 "proc file:$proc_ctrl does not exists (dev added to thread?)"
69    else
70	if [[ ! -w "$proc_ctrl" ]]; then
71	    err 4 "proc file:$proc_ctrl not writable, not root?!"
72	fi
73    fi
74
75    if [[ "$DEBUG" == "yes" ]]; then
76	echo "cmd: $@ > $proc_ctrl"
77    fi
78    # Quoting of "$@" is important for space expansion
79    echo "$@" > "$proc_ctrl" || status=$?
80
81    if [[ "$proc_file" != "pgctrl" ]]; then
82        result=$(grep "Result: OK:" $proc_ctrl) || true
83        if [[ "$result" == "" ]]; then
84            grep "Result:" $proc_ctrl >&2
85        fi
86    fi
87    if (( $status != 0 )); then
88	err 5 "Write error($status) occurred cmd: \"$@ > $proc_ctrl\""
89    fi
90}
91
92# Old obsolete "pgset" function, with slightly improved err handling
93function pgset() {
94    local result
95
96    if [[ "$DEBUG" == "yes" ]]; then
97	echo "cmd: $1 > $PGDEV"
98    fi
99    echo $1 > $PGDEV
100    local status=$?
101
102    result=`cat $PGDEV | fgrep "Result: OK:"`
103    if [[ "$result" == "" ]]; then
104         cat $PGDEV | fgrep Result:
105    fi
106    if (( $status != 0 )); then
107	err 5 "Write error($status) occurred cmd: \"$1 > $PGDEV\""
108    fi
109}
110
111[[ $EUID -eq 0 ]] && trap 'pg_ctrl "reset"' EXIT
112
113## -- General shell tricks --
114
115function root_check_run_with_sudo() {
116    # Trick so, program can be run as normal user, will just use "sudo"
117    #  call as root_check_run_as_sudo "$@"
118    if [ "$EUID" -ne 0 ]; then
119	if [ -x $0 ]; then # Directly executable use sudo
120	    info "Not root, running with sudo"
121            sudo "$0" "$@"
122            exit $?
123	fi
124	err 4 "cannot perform sudo run of $0"
125    fi
126}
127
128# Exact input device's NUMA node info
129function get_iface_node()
130{
131    local node=$(</sys/class/net/$1/device/numa_node)
132    if [[ $node == -1 ]]; then
133        echo 0
134    else
135        echo $node
136    fi
137}
138
139# Given an Dev/iface, get its queues' irq numbers
140function get_iface_irqs()
141{
142	local IFACE=$1
143	local queues="${IFACE}-.*TxRx"
144
145	irqs=$(grep "$queues" /proc/interrupts | cut -f1 -d:)
146	[ -z "$irqs" ] && irqs=$(grep $IFACE /proc/interrupts | cut -f1 -d:)
147	[ -z "$irqs" ] && irqs=$(for i in `ls -Ux /sys/class/net/$IFACE/device/msi_irqs` ;\
148	    do grep "$i:.*TxRx" /proc/interrupts | grep -v fdir | cut -f 1 -d : ;\
149	    done)
150	[ -z "$irqs" ] && err 3 "Could not find interrupts for $IFACE"
151
152	echo $irqs
153}
154
155# Given a NUMA node, return cpu ids belonging to it.
156function get_node_cpus()
157{
158	local node=$1
159	local node_cpu_list
160	local node_cpu_range_list=`cut -f1- -d, --output-delimiter=" " \
161	                  /sys/devices/system/node/node$node/cpulist`
162
163	for cpu_range in $node_cpu_range_list
164	do
165	    node_cpu_list="$node_cpu_list "`seq -s " " ${cpu_range//-/ }`
166	done
167
168	echo $node_cpu_list
169}
170
171# Check $1 is in between $2, $3 ($2 <= $1 <= $3)
172function in_between() { [[ ($1 -ge $2) && ($1 -le $3) ]] ; }
173
174# Extend shrunken IPv6 address.
175# fe80::42:bcff:fe84:e10a => fe80:0:0:0:42:bcff:fe84:e10a
176function extend_addr6()
177{
178    local addr=$1
179    local sep=: sep2=::
180    local sep_cnt=$(tr -cd $sep <<< $1 | wc -c)
181    local shrink
182
183    # separator count should be (2 <= $sep_cnt <= 7)
184    if ! (in_between $sep_cnt 2 7); then
185        err 5 "Invalid IP6 address: $1"
186    fi
187
188    # if shrink '::' occurs multiple, it's malformed.
189    shrink=( $(egrep -o "$sep{2,}" <<< $addr) )
190    if [[ ${#shrink[@]} -ne 0 ]]; then
191        if [[ ${#shrink[@]} -gt 1 || ( ${shrink[0]} != $sep2 ) ]]; then
192            err 5 "Invalid IP6 address: $1"
193        fi
194    fi
195
196    # add 0 at begin & end, and extend addr by adding :0
197    [[ ${addr:0:1} == $sep ]] && addr=0${addr}
198    [[ ${addr: -1} == $sep ]] && addr=${addr}0
199    echo "${addr/$sep2/$(printf ':0%.s' $(seq $[8-sep_cnt])):}"
200}
201
202# Given a single IP(v4/v6) address, whether it is valid.
203function validate_addr()
204{
205    # check function is called with (funcname)6
206    [[ ${FUNCNAME[1]: -1} == 6 ]] && local IP6=6
207    local bitlen=$[ IP6 ? 128 : 32 ]
208    local len=$[ IP6 ? 8 : 4 ]
209    local max=$[ 2**(len*2)-1 ]
210    local net prefix
211    local addr sep
212
213    IFS='/' read net prefix <<< $1
214    [[ $IP6 ]] && net=$(extend_addr6 $net)
215
216    # if prefix exists, check (0 <= $prefix <= $bitlen)
217    if [[ -n $prefix ]]; then
218        if ! (in_between $prefix 0 $bitlen); then
219            err 5 "Invalid prefix: /$prefix"
220        fi
221    fi
222
223    # set separator for each IP(v4/v6)
224    [[ $IP6 ]] && sep=: || sep=.
225    IFS=$sep read -a addr <<< $net
226
227    # array length
228    if [[ ${#addr[@]} != $len ]]; then
229        err 5 "Invalid IP$IP6 address: $1"
230    fi
231
232    # check each digit (0 <= $digit <= $max)
233    for digit in "${addr[@]}"; do
234        [[ $IP6 ]] && digit=$[ 16#$digit ]
235        if ! (in_between $digit 0 $max); then
236            err 5 "Invalid IP$IP6 address: $1"
237        fi
238    done
239
240    return 0
241}
242
243function validate_addr6() { validate_addr $@ ; }
244
245# Given a single IP(v4/v6) or CIDR, return minimum and maximum IP addr.
246function parse_addr()
247{
248    # check function is called with (funcname)6
249    [[ ${FUNCNAME[1]: -1} == 6 ]] && local IP6=6
250    local net prefix
251    local min_ip max_ip
252
253    IFS='/' read net prefix <<< $1
254    [[ $IP6 ]] && net=$(extend_addr6 $net)
255
256    if [[ -z $prefix ]]; then
257        min_ip=$net
258        max_ip=$net
259    else
260        # defining array for converting Decimal 2 Binary
261        # 00000000 00000001 00000010 00000011 00000100 ...
262        local d2b='{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}'
263        [[ $IP6 ]] && d2b+=$d2b
264        eval local D2B=($d2b)
265
266        local bitlen=$[ IP6 ? 128 : 32 ]
267        local remain=$[ bitlen-prefix ]
268        local octet=$[ IP6 ? 16 : 8 ]
269        local min_mask max_mask
270        local min max
271        local ip_bit
272        local ip sep
273
274        # set separator for each IP(v4/v6)
275        [[ $IP6 ]] && sep=: || sep=.
276        IFS=$sep read -ra ip <<< $net
277
278        min_mask="$(printf '1%.s' $(seq $prefix))$(printf '0%.s' $(seq $remain))"
279        max_mask="$(printf '0%.s' $(seq $prefix))$(printf '1%.s' $(seq $remain))"
280
281        # calculate min/max ip with &,| operator
282        for i in "${!ip[@]}"; do
283            digit=$[ IP6 ? 16#${ip[$i]} : ${ip[$i]} ]
284            ip_bit=${D2B[$digit]}
285
286            idx=$[ octet*i ]
287            min[$i]=$[ 2#$ip_bit & 2#${min_mask:$idx:$octet} ]
288            max[$i]=$[ 2#$ip_bit | 2#${max_mask:$idx:$octet} ]
289            [[ $IP6 ]] && { min[$i]=$(printf '%X' ${min[$i]});
290                            max[$i]=$(printf '%X' ${max[$i]}); }
291        done
292
293        min_ip=$(IFS=$sep; echo "${min[*]}")
294        max_ip=$(IFS=$sep; echo "${max[*]}")
295    fi
296
297    echo $min_ip $max_ip
298}
299
300function parse_addr6() { parse_addr $@ ; }
301
302# Given a single or range of port(s), return minimum and maximum port number.
303function parse_ports()
304{
305    local port_str=$1
306    local port_list
307    local min_port
308    local max_port
309
310    IFS="-" read -ra port_list <<< $port_str
311
312    min_port=${port_list[0]}
313    max_port=${port_list[1]:-$min_port}
314
315    echo $min_port $max_port
316}
317
318# Given a minimum and maximum port, verify port number.
319function validate_ports()
320{
321    local min_port=$1
322    local max_port=$2
323
324    # 1 <= port <= 65535
325    if (in_between $min_port 1 65535); then
326	if (in_between $max_port 1 65535); then
327	    if [[ $min_port -le $max_port ]]; then
328		return 0
329	    fi
330	fi
331    fi
332
333    err 5 "Invalid port(s): $min_port-$max_port"
334}
335