Merge branch 'doc-net-ieee802154-move-from-plain-text-to-rst'

Stefan Schmidt says:

====================
doc: net: ieee802154: move from plain text to rst

The ieee802154 subsystem doc was still in plain text. With the networking book
taking shape I thought it was time to do the first step and move it over to rst.
This really is only the minimal conversion. I need to take some time to update
and extend the docs.

The patches are based on net-next, but they only touch the networking book so I
would not expect and trouble. From what I have seen they would go through
Jonathan's tree after being acked by Dave? If you want this patches against a
different tree let me know.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/ieee802154.txt → Documentation/networking/ieee802154.rst

-
-		Linux IEEE 802.15.4 implementation
-
+===============================
+IEEE 802.15.4 Developer's Guide
+===============================
 
 Introduction
 ============
 The IEEE 802.15.4 working group focuses on standardization of the bottom
 two layers: Medium Access Control (MAC) and Physical access (PHY). And there
 are mainly two options available for upper layers:
- - ZigBee - proprietary protocol from the ZigBee Alliance
- - 6LoWPAN - IPv6 networking over low rate personal area networks
+
+- ZigBee - proprietary protocol from the ZigBee Alliance
+- 6LoWPAN - IPv6 networking over low rate personal area networks
 
 The goal of the Linux-wpan is to provide a complete implementation
 of the IEEE 802.15.4 and 6LoWPAN protocols. IEEE 802.15.4 is a stack
 of protocols for organizing Low-Rate Wireless Personal Area Networks.
 
 The stack is composed of three main parts:
- - IEEE 802.15.4 layer;  We have chosen to use plain Berkeley socket API,
-   the generic Linux networking stack to transfer IEEE 802.15.4 data
-   messages and a special protocol over netlink for configuration/management
- - MAC - provides access to shared channel and reliable data delivery
- - PHY - represents device drivers
 
+- IEEE 802.15.4 layer;  We have chosen to use plain Berkeley socket API,
+  the generic Linux networking stack to transfer IEEE 802.15.4 data
+  messages and a special protocol over netlink for configuration/management
+- MAC - provides access to shared channel and reliable data delivery
+- PHY - represents device drivers
 
 Socket API
 ==========
 
-int sd = socket(PF_IEEE802154, SOCK_DGRAM, 0);
-.....
+.. c:function:: int sd = socket(PF_IEEE802154, SOCK_DGRAM, 0);
 
 The address family, socket addresses etc. are defined in the
 include/net/af_ieee802154.h header or in the special header
 in the userspace package (see either http://wpan.cakelab.org/ or the
 git tree at https://github.com/linux-wpan/wpan-tools).
 
+6LoWPAN Linux implementation
+============================
+
+The IEEE 802.15.4 standard specifies an MTU of 127 bytes, yielding about 80
+octets of actual MAC payload once security is turned on, on a wireless link
+with a link throughput of 250 kbps or less.  The 6LoWPAN adaptation format
+[RFC4944] was specified to carry IPv6 datagrams over such constrained links,
+taking into account limited bandwidth, memory, or energy resources that are
+expected in applications such as wireless Sensor Networks.  [RFC4944] defines
+a Mesh Addressing header to support sub-IP forwarding, a Fragmentation header
+to support the IPv6 minimum MTU requirement [RFC2460], and stateless header
+compression for IPv6 datagrams (LOWPAN_HC1 and LOWPAN_HC2) to reduce the
+relatively large IPv6 and UDP headers down to (in the best case) several bytes.
+
+In September 2011 the standard update was published - [RFC6282].
+It deprecates HC1 and HC2 compression and defines IPHC encoding format which is
+used in this Linux implementation.
+
+All the code related to 6lowpan you may find in files: net/6lowpan/*
+and net/ieee802154/6lowpan/*
+
+To setup a 6LoWPAN interface you need:
+1. Add IEEE802.15.4 interface and set channel and PAN ID;
+2. Add 6lowpan interface by command like:
+# ip link add link wpan0 name lowpan0 type lowpan
+3. Bring up 'lowpan0' interface
 
-Kernel side
-=============
+Drivers
+=======
 
 Like with WiFi, there are several types of devices implementing IEEE 802.15.4.
 1) 'HardMAC'. The MAC layer is implemented in the device itself, the device
-   exports a management (e.g. MLME) and data API.
+exports a management (e.g. MLME) and data API.
 2) 'SoftMAC' or just radio. These types of devices are just radio transceivers
-   possibly with some kinds of acceleration like automatic CRC computation and
-   comparation, automagic ACK handling, address matching, etc.
+possibly with some kinds of acceleration like automatic CRC computation and
+comparation, automagic ACK handling, address matching, etc.
 
 Those types of devices require different approach to be hooked into Linux kernel.
 
-
 HardMAC
-=======
+-------
 
 See the header include/net/ieee802154_netdev.h. You have to implement Linux
 net_device, with .type = ARPHRD_IEEE802154. Data is exchanged with socket family
@@ -64,9 +89,8 @@ net_device with a pointer to struct ieee802154_mlme_ops instance. The fields
 assoc_req, assoc_resp, disassoc_req, start_req, and scan_req are optional.
 All other fields are required.
 
-
 SoftMAC
-=======
+-------
 
 The MAC is the middle layer in the IEEE 802.15.4 Linux stack. This moment it
 provides interface for drivers registration and management of slave interfaces.
@@ -79,99 +103,78 @@ This layer is going to be extended soon.
 See header include/net/mac802154.h and several drivers in
 drivers/net/ieee802154/.
 
+Fake drivers
+------------
+
+In addition there is a driver available which simulates a real device with
+SoftMAC (fakelb - IEEE 802.15.4 loopback driver) interface. This option
+provides a possibility to test and debug the stack without usage of real hardware.
 
 Device drivers API
 ==================
 
 The include/net/mac802154.h defines following functions:
- - struct ieee802154_hw *
-   ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops):
-   allocation of IEEE 802.15.4 compatible hardware device
 
- - void ieee802154_free_hw(struct ieee802154_hw *hw):
-   freeing allocated hardware device
+.. c:function:: struct ieee802154_dev *ieee802154_alloc_device (size_t priv_size, struct ieee802154_ops *ops)
 
- - int ieee802154_register_hw(struct ieee802154_hw *hw):
-   register PHY which is the allocated hardware device, in the system
+Allocation of IEEE 802.15.4 compatible device.
 
- - void ieee802154_unregister_hw(struct ieee802154_hw *hw):
-   freeing registered PHY
+.. c:function:: void ieee802154_free_device(struct ieee802154_dev *dev)
 
- - void ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb,
-                              u8 lqi):
-   telling 802.15.4 module there is a new received frame in the skb with
-   the RF Link Quality Indicator (LQI) from the hardware device
+Freeing allocated device.
 
- - void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
-                                 bool ifs_handling):
-   telling 802.15.4 module the frame in the skb is or going to be
-   transmitted through the hardware device
+.. c:function:: int ieee802154_register_device(struct ieee802154_dev *dev)
+
+Register PHY in the system.
+
+.. c:function:: void ieee802154_unregister_device(struct ieee802154_dev *dev)
+
+Freeing registered PHY.
+
+.. c:function:: void ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi):
+
+Telling 802.15.4 module there is a new received frame in the skb with
+the RF Link Quality Indicator (LQI) from the hardware device.
+
+.. c:function:: void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb, bool ifs_handling):
+
+Telling 802.15.4 module the frame in the skb is or going to be
+transmitted through the hardware device
 
 The device driver must implement the following callbacks in the IEEE 802.15.4
-operations structure at least:
-struct ieee802154_ops {
-	...
-	int	(*start)(struct ieee802154_hw *hw);
-	void	(*stop)(struct ieee802154_hw *hw);
-	...
-	int	(*xmit_async)(struct ieee802154_hw *hw, struct sk_buff *skb);
-	int	(*ed)(struct ieee802154_hw *hw, u8 *level);
-	int	(*set_channel)(struct ieee802154_hw *hw, u8 page, u8 channel);
-	...
-};
-
- - int start(struct ieee802154_hw *hw):
-   handler that 802.15.4 module calls for the hardware device initialization.
-
- - void stop(struct ieee802154_hw *hw):
-   handler that 802.15.4 module calls for the hardware device cleanup.
-
- - int xmit_async(struct ieee802154_hw *hw, struct sk_buff *skb):
-   handler that 802.15.4 module calls for each frame in the skb going to be
-   transmitted through the hardware device.
-
- - int ed(struct ieee802154_hw *hw, u8 *level):
-   handler that 802.15.4 module calls for Energy Detection from the hardware
-   device.
-
- - int set_channel(struct ieee802154_hw *hw, u8 page, u8 channel):
-   set radio for listening on specific channel of the hardware device.
+operations structure at least::
 
-Moreover IEEE 802.15.4 device operations structure should be filled.
+   struct ieee802154_ops {
+        ...
+        int     (*start)(struct ieee802154_hw *hw);
+        void    (*stop)(struct ieee802154_hw *hw);
+        ...
+        int     (*xmit_async)(struct ieee802154_hw *hw, struct sk_buff *skb);
+        int     (*ed)(struct ieee802154_hw *hw, u8 *level);
+        int     (*set_channel)(struct ieee802154_hw *hw, u8 page, u8 channel);
+        ...
+   };
 
-Fake drivers
-============
+.. c:function:: int start(struct ieee802154_hw *hw):
 
-In addition there is a driver available which simulates a real device with
-SoftMAC (fakelb - IEEE 802.15.4 loopback driver) interface. This option
-provides a possibility to test and debug the stack without usage of real hardware.
+Handler that 802.15.4 module calls for the hardware device initialization.
 
-See sources in drivers/net/ieee802154 folder for more details.
+.. c:function:: void stop(struct ieee802154_hw *hw):
 
+Handler that 802.15.4 module calls for the hardware device cleanup.
 
-6LoWPAN Linux implementation
-============================
+.. c:function:: int xmit_async(struct ieee802154_hw *hw, struct sk_buff *skb):
 
-The IEEE 802.15.4 standard specifies an MTU of 127 bytes, yielding about 80
-octets of actual MAC payload once security is turned on, on a wireless link
-with a link throughput of 250 kbps or less.  The 6LoWPAN adaptation format
-[RFC4944] was specified to carry IPv6 datagrams over such constrained links,
-taking into account limited bandwidth, memory, or energy resources that are
-expected in applications such as wireless Sensor Networks.  [RFC4944] defines
-a Mesh Addressing header to support sub-IP forwarding, a Fragmentation header
-to support the IPv6 minimum MTU requirement [RFC2460], and stateless header
-compression for IPv6 datagrams (LOWPAN_HC1 and LOWPAN_HC2) to reduce the
-relatively large IPv6 and UDP headers down to (in the best case) several bytes.
+Handler that 802.15.4 module calls for each frame in the skb going to be
+transmitted through the hardware device.
 
-In September 2011 the standard update was published - [RFC6282].
-It deprecates HC1 and HC2 compression and defines IPHC encoding format which is
-used in this Linux implementation.
+.. c:function:: int ed(struct ieee802154_hw *hw, u8 *level):
 
-All the code related to 6lowpan you may find in files: net/6lowpan/*
-and net/ieee802154/6lowpan/*
+Handler that 802.15.4 module calls for Energy Detection from the hardware
+device.
 
-To setup a 6LoWPAN interface you need:
-1. Add IEEE802.15.4 interface and set channel and PAN ID;
-2. Add 6lowpan interface by command like:
-   # ip link add link wpan0 name lowpan0 type lowpan
-3. Bring up 'lowpan0' interface
+.. c:function:: int set_channel(struct ieee802154_hw *hw, u8 page, u8 channel):
+
+Set radio for listening on specific channel of the hardware device.
+
+Moreover IEEE 802.15.4 device operations structure should be filled.

Documentation/networking/index.rst

@@ -25,6 +25,7 @@ Contents:
    device_drivers/intel/iavf
    device_drivers/intel/ice
    devlink-info-versions
+   ieee802154
    kapi
    z8530book
    msg_zerocopy