netdev - Re: Fwd: [PATCH] [-mm] ACPI: export ACPI events via netlink

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Date:	Fri, 29 Jun 2007 13:59:55 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	hadi@...erus.ca, Zhang Rui <rui.zhang@...el.com>,
	netdev@...r.kernel.org,
	"linux-acpi@...r" <linux-acpi@...r.kernel.org>, lenb@...nel.org,
	Thomas Graf <tgraf@...g.ch>
Subject: Re: Fwd: [PATCH] [-mm] ACPI: export ACPI events via netlink

On Fri, 2007-06-29 at 13:51 +0200, Patrick McHardy wrote:

> Do multicast groups have to have a seperate name? Or would it suffice
> to have them associated with the genl family and be able to find out
> the starting group number? In that case something like
> 
> struct genl_mc_groups {
> 	struct genl_family *family or char *family_name or similar;
> 	unsigned int group_off;
> 	unsigned int group_num;
> 	unsigned long groups[];
> };
> 
> seems to make more sense since you only need a single struct
> per family.

Hm. For me that'd work too but Jamal wanted dynamically allocated groups
if I understood him correctly. I'm not too concerned with that case, I'd
think most people know the groups up-front. On the other hand, I can see
something like a group per netdev or whatever other instance too.

> Why would you care about holes? If you really want to use sparse
> bitmaps that would complicate the code a lot.

No, not sparse bitmaps, but the bitmap could have a hole when a family
goes away, and we could reuse that group number later. If we have it in
a bitmap we know without checking all group IDs.

johannes

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