Documentation: usb: ECM subset function testing
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>
diff --git a/Documentation/usb/gadget-testing.txt b/Documentation/usb/gadget-testing.txt
index 7df8785..b40db75 100644
--- a/Documentation/usb/gadget-testing.txt
+++ b/Documentation/usb/gadget-testing.txt
@@ -3,6 +3,7 @@
1. ACM function
2. ECM function
+3. ECM subset function
1. ACM function
@@ -66,3 +67,36 @@
On the device: ping <host'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>