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

provided by gadgets.





1. ACM function

1. ACM function

2. ECM function









1. ACM function

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




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

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

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

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>