ieee802154: add documentation about our stack

Add MAINTAINERS entry and a small text describing our stack interfaces,
how to hook the drivers, etc.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Sergey Lapin <slapin@ossfans.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 76 insertions, 0 deletions

diff --git a/Documentation/networking/ieee802154.txt b/Documentation/networking/ieee802154.txt
new file mode 100644
index 000000000000..a0280ad2edc9
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+++ b/Documentation/networking/ieee802154.txt
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+
+                Linux IEEE 802.15.4 implementation
+
+
+Introduction
+============
+
+The Linux-ZigBee project goal is to provide complete implementation
+of IEEE 802.15.4 / ZigBee / 6LoWPAN protocols. IEEE 802.15.4 is a stack
+of protocols for organizing Low-Rate Wireless Personal Area Networks.
+
+Currently only IEEE 802.15.4 layer is implemented. We have choosen
+to use plain Berkeley socket API, the generic Linux networking stack
+to transfer IEEE 802.15.4 messages and a special protocol over genetlink
+for configuration/management
+
+
+Socket API
+==========
+
+int sd = socket(PF_IEEE802154, SOCK_DGRAM, 0);
+.....
+
+The address family, socket addresses etc. are defined in the
+include/net/ieee802154/af_ieee802154.h header or in the special header
+in our userspace package (see either linux-zigbee sourceforge download page
+or git tree at git://linux-zigbee.git.sourceforge.net/gitroot/linux-zigbee).
+
+One can use SOCK_RAW for passing raw data towards device xmit function. YMMV.
+
+
+MLME - MAC Level Management
+============================
+
+Most of IEEE 802.15.4 MLME interfaces are directly mapped on netlink commands.
+See the include/net/ieee802154/nl802154.h header. Our userspace tools package
+(see above) provides CLI configuration utility for radio interfaces and simple
+coordinator for IEEE 802.15.4 networks as an example users of MLME protocol.
+
+
+Kernel side
+=============
+
+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 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.
+
+Those types of devices require different approach to be hooked into Linux kernel.
+
+
+HardMAC
+=======
+
+See the header include/net/ieee802154/netdevice.h. You have to implement Linux
+net_device, with .type = ARPHRD_IEEE802154. Data is exchanged with socket family
+code via plain sk_buffs. The control block of sk_buffs will contain additional
+info as described in the struct ieee802154_mac_cb.
+
+To hook the MLME interface you have to populate the ml_priv field of your
+net_device with a pointer to struct ieee802154_mlme_ops instance. All fields are
+required.
+
+We provide an example of simple HardMAC driver at drivers/ieee802154/fakehard.c
+
+
+SoftMAC
+=======
+
+We are going to provide intermediate layer impelementing IEEE 802.15.4 MAC
+in software. This is currently WIP.
+
+See header include/net/ieee802154/mac802154.h and several drivers in
+drivers/ieee802154/