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

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Message-ID: <4684FF9A.10807@trash.net>
Date:	Fri, 29 Jun 2007 14:48:26 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Johannes Berg <johannes@...solutions.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

Johannes Berg wrote:
> 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.
> 
> 
> Hmm, another thought: since we have 32 bits for group numbers and 16
> bits for families we could just reserve 16 bits for groups within each
> family. Or do we get trouble with that because in some place there's a
> group bitmap or such?


Yes, af_netlink has a bitmap per socket that is subscribed to any group.
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