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53 lines
1.5 KiB
53 lines
1.5 KiB
.. SPDX-License-Identifier: GPL-2.0 |
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============================================== |
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Netdev private dataroom for 6lowpan interfaces |
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============================================== |
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All 6lowpan able net devices, means all interfaces with ARPHRD_6LOWPAN, |
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must have "struct lowpan_priv" placed at beginning of netdev_priv. |
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The priv_size of each interface should be calculate by:: |
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dev->priv_size = LOWPAN_PRIV_SIZE(LL_6LOWPAN_PRIV_DATA); |
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Where LL_PRIV_6LOWPAN_DATA is sizeof linklayer 6lowpan private data struct. |
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To access the LL_PRIV_6LOWPAN_DATA structure you can cast:: |
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lowpan_priv(dev)-priv; |
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to your LL_6LOWPAN_PRIV_DATA structure. |
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Before registering the lowpan netdev interface you must run:: |
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lowpan_netdev_setup(dev, LOWPAN_LLTYPE_FOOBAR); |
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wheres LOWPAN_LLTYPE_FOOBAR is a define for your 6LoWPAN linklayer type of |
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enum lowpan_lltypes. |
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Example to evaluate the private usually you can do:: |
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static inline struct lowpan_priv_foobar * |
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lowpan_foobar_priv(struct net_device *dev) |
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{ |
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return (struct lowpan_priv_foobar *)lowpan_priv(dev)->priv; |
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} |
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switch (dev->type) { |
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case ARPHRD_6LOWPAN: |
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lowpan_priv = lowpan_priv(dev); |
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/* do great stuff which is ARPHRD_6LOWPAN related */ |
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switch (lowpan_priv->lltype) { |
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case LOWPAN_LLTYPE_FOOBAR: |
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/* do 802.15.4 6LoWPAN handling here */ |
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lowpan_foobar_priv(dev)->bar = foo; |
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break; |
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... |
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} |
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break; |
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... |
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} |
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In case of generic 6lowpan branch ("net/6lowpan") you can remove the check |
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on ARPHRD_6LOWPAN, because you can be sure that these function are called |
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by ARPHRD_6LOWPAN interfaces.
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