How to transfer data from usb peropheral device to host

Hello!
I am developing a usb device with an i.mx6 chip and want to transfer large amount of data to a host via USB.
In that context I came across gadgetfs, functionfs and usblibg.
Whats the easiest way to transfer data from my application to the host (high througput!)
Thanks!

The truly easiest/best is if the USB interface on your ARM board is a USB-OTG (USB On The Go), which means it is a 'device' (in contrast to a 'host'). Commonly, USB OTG ports are built with mini-USB connectors (although that's not the final indicator). If not, you will have to use USB Gadget support, which means that the USB port can only function in the role of a device.
I can't really give much more info than that, but a little Google research for USB-OTG should help you along your way.

That sounds interesting.
So far I was under the assumption that the OTG port (which my board does indeed have!) was a port which, once connected to a host (a PC for example) would make the board appear as a device.
But if I would connect a device to that very port (a flash drive for example) the board would itself act as a host to that flash drive.
I thought that's how smartphones would appear as a device to the PC they are connected and as host to a Memory card reader for example.
My goal is to have the board indeed appear as a device.