kernel/Documentation/ABI/testing/configfs-usb-gadget-loopback

   1 What:           /config/usb-gadget/gadget/functions/Loopback.name
   2 Date:           Nov 2013
   3 KernelVersion:  3.13
   4 Description:
   5                 The attributes:
   6
   7                 qlen            - depth of loopback queue
   8                 bulk_buflen     - buffer length