Re: [PATCH linux-wpan/radvd for-upstream 2/2] device-linux: get address length via sysfs

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Hi,

On 08/02/2016 04:37 PM, Alexander Aring wrote:
> This patch will change the behaviour for 6LoWPAN interface to detect the
> linklayer address length via sysfs. The usually way to get the address
> length is via a mapping from ARPHRD device type. This doesn't work for
> 6LoWPAN interfaces, we need at least some other mechanism. This patch
> adds the mechanism to read out the sysfs UAPI to get the addr_len
> attribute of net_device. This will not work if there are two 6LoWPAN
> link-layer types with the same address length but need different
> handling in userspace. For that reason I think a linklayer type would be
> better, this requires a 6lowpan netlink API which doesn't exist right
> now. So we use this simple way now.
> 
> Signed-off-by: Alexander Aring <aar@xxxxxxxxxxxxxx>

I need to remove this signed off. That's not radvd commit style. :-)

---

After talking shortly with Marcel, RTNL netlink has already the same
stuff what we can get from sysfs entry here. See [0] kernel and [1]
userspace.

Over RTA_PAYLOAD(tb[IFLA_ADDRESS]) [1], we should be able to get the
dev->addr_len which is given by [0]... I make now a new version with
netlink as UAPI mechanism.

- Alex

[0] http://lxr.free-electrons.com/source/net/core/rtnetlink.c#L1247
[1] https://github.com/shemminger/iproute2/blob/master/lib/ll_map.c#L84
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