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+#
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+# Common functions used by pktgen scripts
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+# - Depending on bash 3 (or higher) syntax
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+#
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+# Author: Jesper Dangaaard Brouer
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+# License: GPL
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+
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+## -- General shell logging cmds --
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+function err() {
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+ local exitcode=$1
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+ shift
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+ echo "ERROR: $@" >&2
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+ exit $exitcode
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+}
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+
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+function warn() {
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+ echo "WARN : $@" >&2
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+}
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+
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+function info() {
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+ if [[ -n "$VERBOSE" ]]; then
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+ echo "INFO : $@" >&2
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+ fi
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+}
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+
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+## -- Pktgen proc config commands -- ##
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+export PROC_DIR=/proc/net/pktgen
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+#
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+# Three different shell functions for configuring the different
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+# components of pktgen:
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+# pg_ctrl(), pg_thread() and pg_set().
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+#
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+# These functions correspond to pktgens different components.
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+# * pg_ctrl() control "pgctrl" (/proc/net/pktgen/pgctrl)
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+# * pg_thread() control the kernel threads and binding to devices
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+# * pg_set() control setup of individual devices
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+function pg_ctrl() {
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+ local proc_file="pgctrl"
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+ proc_cmd ${proc_file} "$@"
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+}
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+
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+function pg_thread() {
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+ local thread=$1
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+ local proc_file="kpktgend_${thread}"
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+ shift
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+ proc_cmd ${proc_file} "$@"
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+}
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+
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+function pg_set() {
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+ local dev=$1
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+ local proc_file="$dev"
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+ shift
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+ proc_cmd ${proc_file} "$@"
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+}
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+
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+# More generic replacement for pgset(), that does not depend on global
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+# variable for proc file.
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+function proc_cmd() {
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+ local result
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+ local proc_file=$1
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+ # after shift, the remaining args are contained in $@
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+ shift
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+ local proc_ctrl=${PROC_DIR}/$proc_file
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+ if [[ ! -e "$proc_ctrl" ]]; then
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+ err 3 "proc file:$proc_ctrl does not exists (dev added to thread?)"
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+ else
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+ if [[ ! -w "$proc_ctrl" ]]; then
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+ err 4 "proc file:$proc_ctrl not writable, not root?!"
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+ fi
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+ fi
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+
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+ if [[ "$DEBUG" == "yes" ]]; then
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+ echo "cmd: $@ > $proc_ctrl"
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+ fi
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+ # Quoting of "$@" is important for space expansion
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+ echo "$@" > "$proc_ctrl"
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+ local status=$?
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+
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+ result=$(grep "Result: OK:" $proc_ctrl)
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+ # Due to pgctrl, cannot use exit code $? from grep
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+ if [[ "$result" == "" ]]; then
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+ grep "Result:" $proc_ctrl >&2
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+ fi
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+ if (( $status != 0 )); then
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+ err 5 "Write error($status) occurred cmd: \"$@ > $proc_ctrl\""
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+ fi
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+}
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+
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+# Old obsolete "pgset" function, with slightly improved err handling
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+function pgset() {
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+ local result
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+
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+ if [[ "$DEBUG" == "yes" ]]; then
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+ echo "cmd: $1 > $PGDEV"
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+ fi
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+ echo $1 > $PGDEV
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+ local status=$?
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+
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+ result=`cat $PGDEV | fgrep "Result: OK:"`
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+ if [[ "$result" == "" ]]; then
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+ cat $PGDEV | fgrep Result:
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+ fi
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+ if (( $status != 0 )); then
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+ err 5 "Write error($status) occurred cmd: \"$1 > $PGDEV\""
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+ fi
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+}
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+
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+## -- General shell tricks --
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+
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+function root_check_run_with_sudo() {
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+ # Trick so, program can be run as normal user, will just use "sudo"
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+ # call as root_check_run_as_sudo "$@"
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+ if [ "$EUID" -ne 0 ]; then
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+ if [ -x $0 ]; then # Directly executable use sudo
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+ info "Not root, running with sudo"
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+ sudo "$0" "$@"
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+ exit $?
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+ fi
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+ err 4 "cannot perform sudo run of $0"
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+ fi
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+}
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Jesper Dangaard Brouer