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| -rw-r--r-- | Documentation/usb/gadget-testing.txt | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/Documentation/usb/gadget-testing.txt b/Documentation/usb/gadget-testing.txt index 7df8785fc70d..b40db750890f 100644 --- a/Documentation/usb/gadget-testing.txt +++ b/Documentation/usb/gadget-testing.txt @@ -3,6 +3,7 @@ provided by gadgets. 1. ACM function 2. ECM function +3. ECM subset 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 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> |