path: root/Documentation/wimax
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authorInaky Perez-Gonzalez <inaky@linux.intel.com>2008-12-20 16:57:32 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2009-01-07 10:00:16 -0800
commit0d695913b0016b362a84a8bb6d6e28f8d90a70e2 (patch)
tree639dbde813e137c385d03205cf97a033dfc103f0 /Documentation/wimax
parent5e07878787ad07361571150230cc3a8d522ae046 (diff)
wimax: documentation for the stack
wimax documentation Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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+ Linux kernel WiMAX stack
+ (C) 2008 Intel Corporation < linux-wimax@intel.com >
+ This provides a basic Linux kernel WiMAX stack to provide a common
+ control API for WiMAX devices, usable from kernel and user space.
+1. Design
+ The WiMAX stack is designed to provide for common WiMAX control
+ services to current and future WiMAX devices from any vendor.
+ Because currently there is only one and we don't know what would be the
+ common services, the APIs it currently provides are very minimal.
+ However, it is done in such a way that it is easily extensible to
+ accommodate future requirements.
+ The stack works by embedding a struct wimax_dev in your device's
+ control structures. This provides a set of callbacks that the WiMAX
+ stack will call in order to implement control operations requested by
+ the user. As well, the stack provides API functions that the driver
+ calls to notify about changes of state in the device.
+ The stack exports the API calls needed to control the device to user
+ space using generic netlink as a marshalling mechanism. You can access
+ them using your own code or use the wrappers provided for your
+ convenience in libwimax (in the wimax-tools package).
+ For detailed information on the stack, please see
+ include/linux/wimax.h.
+2. Usage
+ For usage in a driver (registration, API, etc) please refer to the
+ instructions in the header file include/linux/wimax.h.
+ When a device is registered with the WiMAX stack, a set of debugfs
+ files will appear in /sys/kernel/debug/wimax:wmxX can tweak for
+ control.
+2.1. Obtaining debug information: debugfs entries
+ The WiMAX stack is compiled, by default, with debug messages that can
+ be used to diagnose issues. By default, said messages are disabled.
+ The drivers will register debugfs entries that allow the user to tweak
+ debug settings.
+ Each driver, when registering with the stack, will cause a debugfs
+ directory named wimax:DEVICENAME to be created; optionally, it might
+ create more subentries below it.
+2.1.1. Increasing debug output
+ The files named *dl_* indicate knobs for controlling the debug output
+ of different submodules of the WiMAX stack:
+ *
+# find /sys/kernel/debug/wimax\:wmx0 -name \*dl_\*
+/sys/kernel/debug/wimax:wmx0/.... # other driver specific files
+ NOTE: Of course, if debugfs is mounted in a directory other than
+ /sys/kernel/debug, those paths will change.
+ By reading the file you can obtain the current value of said debug
+ level; by writing to it, you can set it.
+ To increase the debug level of, for example, the id-table submodule,
+ just write:
+$ echo 3 > /sys/kernel/debug/wimax:wmx0/wimax_dl_id_table
+ Increasing numbers yield increasing debug information; for details of
+ what is printed and the available levels, check the source. The code
+ uses 0 for disabled and increasing values until 8.