I was at training camp and saw the play in question. It was in 1v1 O Line drills. Carp was squared up on someone, and his feet slipped out behind him and he fell forward pretty hard, hitting at least one knee on the ground pretty hard. He got up and did a bit more in that drill, then stopped and stood on the side for the rest of the drills.
He then made a brief appearance with the 2nd team O line in team drills, like for a snap or two, then sat out the rest of practice. I'd estimate he did not participate in about 85% of practice. Hopefully they were just resting him and being cautious.