docs: networking: convert 6lowpan.txt to ReST

.. SPDX-License-Identifier: GPL-2.0

Netdev private dataroom for 6lowpan interfaces:

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Netdev private dataroom for 6lowpan interfaces

==============================================

All 6lowpan able net devices, means all interfaces with ARPHRD_6LOWPAN,

must have "struct lowpan_priv" placed at beginning of netdev_priv.

The priv_size of each interface should be calculate by:

The priv_size of each interface should be calculate by::

 dev->priv_size = LOWPAN_PRIV_SIZE(LL_6LOWPAN_PRIV_DATA);

Where LL_PRIV_6LOWPAN_DATA is sizeof linklayer 6lowpan private data struct.

To access the LL_PRIV_6LOWPAN_DATA structure you can cast:

To access the LL_PRIV_6LOWPAN_DATA structure you can cast::

 lowpan_priv(dev)-priv;

to your LL_6LOWPAN_PRIV_DATA structure.

Before registering the lowpan netdev interface you must run:

Before registering the lowpan netdev interface you must run::

 lowpan_netdev_setup(dev, LOWPAN_LLTYPE_FOOBAR);

wheres LOWPAN_LLTYPE_FOOBAR is a define for your 6LoWPAN linklayer type of

enum lowpan_lltypes.

Example to evaluate the private usually you can do:

Example to evaluate the private usually you can do::

 static inline struct lowpan_priv_foobar *

 lowpan_foobar_priv(struct net_device *dev)

   tls

   tls-offload

   nfc

   6lowpan

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