From: Andrzej Pietrasiewicz Date: Tue, 16 Dec 2014 13:56:26 +0000 (+0100) Subject: Documentation: usb: ECM function testing X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d5862ca6da545ec63ec2d2a8c687bf214c87e00e;p=linux-beck.git Documentation: usb: ECM function testing Summary of how to test ECM function of USB gadget. Signed-off-by: Andrzej Pietrasiewicz Signed-off-by: Felipe Balbi --- diff --git a/Documentation/usb/gadget-testing.txt b/Documentation/usb/gadget-testing.txt index 2a448f812f0e..7df8785fc70d 100644 --- a/Documentation/usb/gadget-testing.txt +++ b/Documentation/usb/gadget-testing.txt @@ -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 On the host: cat /dev/ttyACM + +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. 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 +On the host: ping