Some tips for those of of you having problems setting up the wired Logitech F310: I followed the steps exactly as outlined in the following thread after starting from a fresh install of RetroPie v 2.3:

http://dfarq.homeip.net/2014/07/the-logitech-f310-on-retropie/

After following this procedure I went into the MAME emulation and was able to set up most controller buttons by hitting the Tab key on my keyboard but I was unable to use the D-pad functions at all. I noted in another thread that someone mentioned that to get the D-pad working you needed to turn on the mode button. Sure enough when I did this I was able to set up the D-pad buttons to my liking. With mode turned on all buttons seem to be active except for the left and right joy sticks and the left and right trigger buttons. Also note that you should have the switch on the bottom of the controller set to X (the D setting does not seem to work with the above procedure).

I can vouch for this procedure working for MAME emulation but I have not tried any of the other emulators. Hope this info helps…