Revision 2b95550a4323e501e133dac1c9c9cad6ff17f4c1 authored by Linus Torvalds on 11 February 2017, 17:15:58 UTC, committed by Linus Torvalds on 11 February 2017, 17:15:58 UTC
Pull btrfs fixes from Chris Mason: "This has two last minute fixes. The highest priority here is a regression fix for the decompression code, but we also fixed up a problem with the 32-bit compat ioctls. The decompression bug could hand back the wrong data on big reads when zlib was used. I have a larger cleanup to make the math here less error prone, but at this stage in the release Omar's patch is the best choice" * 'for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: btrfs: fix btrfs_decompress_buf2page() btrfs: fix btrfs_compat_ioctl failures on non-compat ioctls
6lowpan.txt
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:
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:
lowpan_priv(dev)-priv;
to your LL_6LOWPAN_PRIV_DATA structure.
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:
static inline sturct lowpan_priv_foobar *
lowpan_foobar_priv(struct net_device *dev)
{
return (sturct lowpan_priv_foobar *)lowpan_priv(dev)->priv;
}
switch (dev->type) {
case ARPHRD_6LOWPAN:
lowpan_priv = lowpan_priv(dev);
/* do great stuff which is ARPHRD_6LOWPAN related */
switch (lowpan_priv->lltype) {
case LOWPAN_LLTYPE_FOOBAR:
/* do 802.15.4 6LoWPAN handling here */
lowpan_foobar_priv(dev)->bar = foo;
break;
...
}
break;
...
}
In case of generic 6lowpan branch ("net/6lowpan") you can remove the check
on ARPHRD_6LOWPAN, because you can be sure that these function are called
by ARPHRD_6LOWPAN interfaces.
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