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Commit d5862ca6 authored by Andrzej Pietrasiewicz's avatar Andrzej Pietrasiewicz Committed by Felipe Balbi
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Documentation: usb: ECM function testing 



Summary of how to test ECM function of USB gadget.

Signed-off-by: default avatarAndrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent e38eb2c8

Documentation/usb/gadget-testing.txt

+34 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ This file summarizes information on basic testing of USB functions 
provided by gadgets.



1. ACM function

2. ECM function





1. ACM function
@@ -32,3 +33,36 @@ then the other way round 


On the device: cat > /dev/ttyGS<Y>

On the host: cat /dev/ttyACM<X>



2. ECM function

===============



The function is provided by usb_f_ecm.ko module.



Function-specific configfs interface

------------------------------------



The function name to use when creating the function directory is "ecm".

The ECM function provides these attributes in its function directory:



	ifname		- network device interface name associated with this

			function instance

	qmult		- queue length multiplier for high and super speed

	host_addr	- MAC address of host's end of this

			Ethernet over USB link

	dev_addr	- MAC address of device's end of this

			Ethernet over USB link



and after creating the functions/ecm.<instance name> they contain default

values: qmult is 5, dev_addr and host_addr are randomly selected.

Except for ifname they can be written to until the function is linked to a

configuration. The ifname is read-only and contains the name of the interface

which was assigned by the net core, e. g. usb0.



Testing the ECM function

------------------------



Configure IP addresses of the device and the host. Then:



On the device: ping <host's IP>

On the host: ping <device's IP>