pping: Add TC-BPF program for egress

Split and rename files so there is one userspace program (pping) and
two kernel-space ones (one for XDP and one for TC-BPF).

Copy the shell script for loading the TC-BPF program from
traffic-pacing-edt folder, but add support for loading a specific
section.

The XDP and TC-BPF programs do not share the ts_start map, so program
does not work.

Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>

pping/functions.sh

@@ -0,0 +1,64 @@
+#
+# Common functions used by scripts in this directory
+#  - Depending on bash 3 (or higher) syntax
+#
+# Author: Jesper Dangaaard Brouer <netoptimizer@brouer.com>
+# License: GPLv2
+
+## -- sudo trick --
+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
+	    echo "# (Not root, running with sudo)" >&2
+            sudo "$0" "$@"
+            exit $?
+	fi
+	echo "cannot perform sudo run of $0"
+	exit 1
+    fi
+}
+
+## -- General shell logging cmds --
+function err() {
+    local exitcode=$1
+    shift
+    echo -e "ERROR: $@" >&2
+    exit $exitcode
+}
+
+function warn() {
+    echo -e "WARN : $@" >&2
+}
+
+function info() {
+    if [[ -n "$VERBOSE" ]]; then
+	echo "# $@"
+    fi
+}
+
+## -- Wrapper calls for TC --
+function _call_tc() {
+    local allow_fail="$1"
+    shift
+    if [[ -n "$VERBOSE" ]]; then
+	echo "tc $@"
+    fi
+    if [[ -n "$DRYRUN" ]]; then
+	return
+    fi
+    $TC "$@"
+    local status=$?
+    if (( $status != 0 )); then
+	if [[ "$allow_fail" == "" ]]; then
+	    err 3 "Exec error($status) occurred cmd: \"$TC $@\""
+	fi
+    fi
+}
+function call_tc() {
+    _call_tc "" "$@"
+}
+function call_tc_allow_fail() {
+    _call_tc "allow_fail" "$@"
+}