Commit | Line | Data |
---|---|---|
107db7ec | 1 | .. SPDX-License-Identifier: GPL-2.0 |
ea9eb698 | 2 | |
107db7ec MCC |
3 | ============================================== |
4 | Netdev private dataroom for 6lowpan interfaces | |
5 | ============================================== | |
ea9eb698 AA |
6 | |
7 | All 6lowpan able net devices, means all interfaces with ARPHRD_6LOWPAN, | |
8 | must have "struct lowpan_priv" placed at beginning of netdev_priv. | |
9 | ||
107db7ec | 10 | The priv_size of each interface should be calculate by:: |
ea9eb698 AA |
11 | |
12 | dev->priv_size = LOWPAN_PRIV_SIZE(LL_6LOWPAN_PRIV_DATA); | |
13 | ||
14 | Where LL_PRIV_6LOWPAN_DATA is sizeof linklayer 6lowpan private data struct. | |
107db7ec | 15 | To access the LL_PRIV_6LOWPAN_DATA structure you can cast:: |
ea9eb698 AA |
16 | |
17 | lowpan_priv(dev)-priv; | |
18 | ||
19 | to your LL_6LOWPAN_PRIV_DATA structure. | |
20 | ||
107db7ec | 21 | Before registering the lowpan netdev interface you must run:: |
ea9eb698 AA |
22 | |
23 | lowpan_netdev_setup(dev, LOWPAN_LLTYPE_FOOBAR); | |
24 | ||
25 | wheres LOWPAN_LLTYPE_FOOBAR is a define for your 6LoWPAN linklayer type of | |
26 | enum lowpan_lltypes. | |
27 | ||
107db7ec | 28 | Example to evaluate the private usually you can do:: |
ea9eb698 | 29 | |
107db7ec MCC |
30 | static inline struct lowpan_priv_foobar * |
31 | lowpan_foobar_priv(struct net_device *dev) | |
32 | { | |
bb38ccce | 33 | return (struct lowpan_priv_foobar *)lowpan_priv(dev)->priv; |
107db7ec | 34 | } |
ea9eb698 | 35 | |
107db7ec MCC |
36 | switch (dev->type) { |
37 | case ARPHRD_6LOWPAN: | |
ea9eb698 AA |
38 | lowpan_priv = lowpan_priv(dev); |
39 | /* do great stuff which is ARPHRD_6LOWPAN related */ | |
40 | switch (lowpan_priv->lltype) { | |
41 | case LOWPAN_LLTYPE_FOOBAR: | |
42 | /* do 802.15.4 6LoWPAN handling here */ | |
43 | lowpan_foobar_priv(dev)->bar = foo; | |
44 | break; | |
45 | ... | |
46 | } | |
47 | break; | |
107db7ec MCC |
48 | ... |
49 | } | |
ea9eb698 AA |
50 | |
51 | In case of generic 6lowpan branch ("net/6lowpan") you can remove the check | |
52 | on ARPHRD_6LOWPAN, because you can be sure that these function are called | |
53 | by ARPHRD_6LOWPAN interfaces. |