include/net/wimax.h



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/*
 * Linux WiMAX
 * Kernel space API for accessing WiMAX devices
 *
 *
 * Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com>
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 *
 * The WiMAX stack provides an API for controlling and managing the
 * system's WiMAX devices. This API affects the control plane; the
 * data plane is accessed via the network stack (netdev).
 *
 * Parts of the WiMAX stack API and notifications are exported to
 * user space via Generic Netlink. In user space, libwimax (part of
 * the wimax-tools package) provides a shim layer for accessing those
 * calls.
 *
 * The API is standarized for all WiMAX devices and different drivers
 * implement the backend support for it. However, device-specific
 * messaging pipes are provided that can be used to issue commands and
 * receive notifications in free form.
 *
 * Currently the messaging pipes are the only means of control as it
 * is not known (due to the lack of more devices in the market) what
 * will be a good abstraction layer. Expect this to change as more
 * devices show in the market. This API is designed to be growable in
 * order to address this problem.
 *
 * USAGE
 *
 * Embed a `struct wimax_dev` at the beginning of the the device's
 * private structure, initialize and register it. For details, see
 * `struct wimax_dev`s documentation.
 *
 * Once this is done, wimax-tools's libwimaxll can be used to
 * communicate with the driver from user space. You user space
 * application does not have to forcibily use libwimaxll and can talk
 * the generic netlink protocol directly if desired.
 *
 * Remember this is a very low level API that will to provide all of
 * WiMAX features. Other daemons and services running in user space
 * are the expected clients of it. They offer a higher level API that
 * applications should use (an example of this is the Intel's WiMAX
 * Network Service for the i2400m).
 *
 * DESIGN
 *
 * Although not set on final stone, this very basic interface is
 * mostly completed. Remember this is meant to grow as new common
 * operations are decided upon. New operations will be added to the
 * interface, intent being on keeping backwards compatibility as much
 * as possible.
 *
 * This layer implements a set of calls to control a WiMAX device,
 * exposing a frontend to the rest of the kernel and user space (via
 * generic netlink) and a backend implementation in the driver through
 * function pointers.
 *
 * WiMAX devices have a state, and a kernel-only API allows the
 * drivers to manipulate that state. State transitions are atomic, and
 * only some of them are allowed (see `enum wimax_st`).
 *
 * Most API calls will set the state automatically; in most cases
 * drivers have to only report state changes due to external
 * conditions.
 *
 * All API operations are 'atomic', serialized through a mutex in the
 * `struct wimax_dev`.
 *
 * EXPORTING TO USER SPACE THROUGH GENERIC NETLINK
 *
 * The API is exported to user space using generic netlink (other
 * methods can be added as needed).
 *
 * There is a Generic Netlink Family named "WiMAX", where interfaces
 * supporting the WiMAX interface receive commands and broadcast their
 * signals over a multicast group named "msg".
 *
 * Mapping to the source/destination interface is done by an interface
 * index attribute.
 *
 * For user-to-kernel traffic (commands) we use a function call
 * marshalling mechanism, where a message X with attributes A, B, C
 * sent from user space to kernel space means executing the WiMAX API
 * call wimax_X(A, B, C), sending the results back as a message.
 *
 * Kernel-to-user (notifications or signals) communication is sent
 * over multicast groups. This allows to have multiple applications
 * monitoring them.
 *
 * Each command/signal gets assigned it's own attribute policy. This