All drains and toilets in my house are working great but whaen I flush my upstairs toilet I have a garrgle in my tub drain whiich started just today

You have a clog in the line somewhere. It just doesn't gargle for the fun of it. Need to get the clog out before something overflows and causes big water damage problem.

Gurgles frequently mean that your vent stack is clogged. The gurgling drain is venting in water to make up for a plugged vent stack, rod it from the roof if its sfae to be up there. Use enough sewer rodder to reach roof top to basement floor plus 20'