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Documentation: usb: NCM function testing 

Summary of how to test NCM function of USB gadget.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
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Andrzej Pietrasiewicz 2014-12-16 14:56:34 +01:00 committed by Felipe Balbi
parent 0d6be59a1d
commit 4d0fa79e0e
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Documentation/usb/gadget-testing.txt
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@ -10,6 +10,7 @@ provided by gadgets.
7. LOOPBACK function 7. LOOPBACK function
8. MASS STORAGE function 8. MASS STORAGE function
9. MIDI function 9. MIDI function
10. NCM function
1. ACM function 1. ACM function
@ -366,3 +367,36 @@ $ aconnect 24:0 128:0 # try it on the host
After the gadget's MIDI port is connected to timidity's MIDI port, After the gadget's MIDI port is connected to timidity's MIDI port,
whatever is played at the gadget side with aplaymidi -l is audible whatever is played at the gadget side with aplaymidi -l is audible
in host's speakers/headphones. in host's speakers/headphones.
10. NCM function
================
The function is provided by usb_f_ncm.ko module.
Function-specific configfs interface
------------------------------------
The function name to use when creating the function directory is "ncm".
The NCM 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/ncm.<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 NCM 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>