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Documentation: usb: ECM subset function testing

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Summary of how to test ECM subset 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 14:56:27 +01:00 • committed by Felipe Balbi
parent d5862ca6da
commit 7bfbc6e3fb
1 changed files with 34 additions and 0 deletions
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34
Documentation/usb/gadget-testing.txt
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@ -3,6 +3,7 @@ provided by gadgets.
1. ACM function 1. ACM function
2. ECM function 2. ECM function
3. ECM subset function
1. ACM function 1. ACM function
@ -66,3 +67,36 @@ Configure IP addresses of the device and the host. Then:
On the device: ping <host's IP> On the device: ping <host's IP>
On the host: ping <device's IP> On the host: ping <device's IP>
3. ECM subset function
======================
The function is provided by usb_f_ecm_subset.ko module.
Function-specific configfs interface
------------------------------------
The function name to use when creating the function directory is "geth".
The ECM subset 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 subset 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>