Documentation/networking/ieee802154: update MAC chapter
Update the documentation according to latest changes. Signed-off-by: Alexander Smirnov <alex.bluesman.smirnov@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
alex.bluesman.smirnov@gmail.com
David S. Miller
parent
e1e49b6413
commit
dd456d45d7
|
|
@ -4,15 +4,22 @@
|
|||
|
||||
Introduction
|
||||
============
|
||||
The IEEE 802.15.4 working group focuses on standartization of bottom
|
||||
two layers: Medium Accsess Control (MAC) and Physical (PHY). And there
|
||||
are mainly two options available for upper layers:
|
||||
- ZigBee - proprietary protocol from ZigBee Alliance
|
||||
- 6LowPAN - IPv6 networking over low rate personal area networks
|
||||
|
||||
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 IEEE 802.15.4 and 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 chosen
|
||||
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
|
||||
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 messages
|
||||
and a special protocol over genetlink for configuration/management
|
||||
- MAC - provides access to shared channel and reliable data delivery
|
||||
- PHY - represents device drivers
|
||||
|
||||
|
||||
Socket API
|
||||
|
|
@ -29,15 +36,6 @@ 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/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
|
||||
=============
|
||||
|
||||
|
|
@ -51,6 +49,15 @@ Like with WiFi, there are several types of devices implementing IEEE 802.15.4.
|
|||
Those types of devices require different approach to be hooked into Linux kernel.
|
||||
|
||||
|
||||
MLME - MAC Level Management
|
||||
============================
|
||||
|
||||
Most of IEEE 802.15.4 MLME interfaces are directly mapped on netlink commands.
|
||||
See the include/net/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.
|
||||
|
||||
|
||||
HardMAC
|
||||
=======
|
||||
|
||||
|
|
@ -73,11 +80,47 @@ We provide an example of simple HardMAC driver at drivers/ieee802154/fakehard.c
|
|||
SoftMAC
|
||||
=======
|
||||
|
||||
We are going to provide intermediate layer implementing IEEE 802.15.4 MAC
|
||||
in software. This is currently WIP.
|
||||
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.
|
||||
|
||||
NOTE: Currently the only monitor device type is supported - it's IEEE 802.15.4
|
||||
stack interface for network sniffers (e.g. WireShark).
|
||||
|
||||
This layer is going to be extended soon.
|
||||
|
||||
See header include/net/mac802154.h and several drivers in drivers/ieee802154/.
|
||||
|
||||
|
||||
Device drivers API
|
||||
==================
|
||||
|
||||
The include/net/mac802154.h defines following functions:
|
||||
- struct ieee802154_dev *ieee802154_alloc_device
|
||||
(size_t priv_size, struct ieee802154_ops *ops):
|
||||
allocation of IEEE 802.15.4 compatible device
|
||||
|
||||
- void ieee802154_free_device(struct ieee802154_dev *dev):
|
||||
freeing allocated device
|
||||
|
||||
- int ieee802154_register_device(struct ieee802154_dev *dev):
|
||||
register PHY in the system
|
||||
|
||||
- void ieee802154_unregister_device(struct ieee802154_dev *dev):
|
||||
freeing registered PHY
|
||||
|
||||
Moreover IEEE 802.15.4 device operations structure should be filled.
|
||||
|
||||
Fake drivers
|
||||
============
|
||||
|
||||
In addition there are two drivers available which simulate real devices with
|
||||
HardMAC (fakehard) and SoftMAC (fakelb - IEEE 802.15.4 loopback driver)
|
||||
interfaces. This option provides possibility to test and debug stack without
|
||||
usage of real hardware.
|
||||
|
||||
See sources in drivers/ieee802154 folder for more details.
|
||||
|
||||
|
||||
6LoWPAN Linux implementation
|
||||
============================
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue