selftests: forwarding: fix race between packet receive and tc check

CHECK_TC="yes"

tc_check_packets()

# Can be overridden by the configuration file. See lib.sh

TC_HIT_TIMEOUT=${TC_HIT_TIMEOUT:=1000} # ms

__tc_check_packets()

{

	local id=$1

	local handle=$2

	local count=$3

	local operator=$4

	start_time="$(date -u +%s%3N)"

	while true

	do

		cmd_jq "tc -j -s filter show $id" \

		       ".[] | select(.options.handle == $handle) | \

	              select(.options.actions[0].stats.packets == $count)" \

			    select(.options.actions[0].stats.packets $operator $count)" \

		    &> /dev/null

		ret=$?

		if [[ $ret -eq 0 ]]; then

			return $ret

		fi

		current_time="$(date -u +%s%3N)"

		diff=$(expr $current_time - $start_time)

		if [ "$diff" -gt "$TC_HIT_TIMEOUT" ]; then

			return 1

		fi

	done

}

tc_check_packets()

{

	local id=$1

	local handle=$2

	local count=$3

	__tc_check_packets "$id" "$handle" "$count" "=="

}

tc_check_packets_hitting()

	local id=$1

	local handle=$2

	cmd_jq "tc -j -s filter show $id" \

	       ".[] | select(.options.handle == $handle) | \

		      select(.options.actions[0].stats.packets > 0)" \

	       &> /dev/null

	__tc_check_packets "$id" "$handle" 0 ">"

}