If u go for Indian or Chinese food you don't expect white staff to work there, but a white person who wants to serve likely won't be turned away because of their skin colour.
I work at an ethnic restaurant that has two white servers, and I've seen Caucasians working in Indian and Asian restaurants; but the opposite is rare. I've lived in Calgary my whole life and have only been served once by a visible minority working at a non-ethnic place.
So after submititng my resume to numerous restaurants downtown, I was hired right away by an ethnic place, but no where else even called me back. There is an absence of minority servers working in canadian/western style restaurants, and i've really only noticed it recently because of my work situation.