What is gfe_rd=cr&ei= ?

It is a cookie link redirected to your browser based on the country from which it is accessed.

Which means If your enter
https://www.google.com

it will return
 https://www.google.co.in/?gfe_rd=cr&ei=fgdfsg4534fdg

and browser will store the cookie and redirect to https://www.google.co.in

gfe=Google Front End
rd=Redirect
cr=Country
ei=Engine Id

This Engine Id is the cookie that is sent to our browser.