Hi guys,
In putting in Stefan's patch for setting short address, PAN ID, and
channel from iz ("iz set" command), I noticed that the kernel will
return a netlink status code if the PAN ID is invalid (0xffff)[1]. The
code it returns is IEEE802154_NO_SHORT_ADDRESS which is defined in
include/net/ieee802154.h[2]. That file contains MAC enumerations from
the 802.15.4 standard, and is not exported to userspace.
In a similar way, I'd like to return an error when the channel set is
not supported by the driver (phy->supported_channels). I can't very well
add to the enum in ieee802154.h because those are values which are
mandated by the standard.
I see how the netlink requests and responses mirror the MAC commands as
listed in the standard, (which means maybe we _should_ be exporting
ieee802154.h into userspace), but it seems like in this one I have a
parameter and nowhere to add it. It _could_ go in nl802154.h[3] but then
we'd be returning codes from different enums in different files (and we
still have to step on top of "reserved" space in the ieee 802.15.4 standard.
Another option is to have a separate return attribute which is specific
to our implementation, and could contain more detailed information (the
kind you might expect to see from the command line output).
Do any of you have any thoughts regarding the "right" way to do this, or
the way it was intended to be done?
Alan.
[1]
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/net/ieee802154/nl-mac.c#n470
[2]
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/net/ieee802154.h#n127
[3]
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/linux/nl802154.h
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