netdev - Re: [PATCH 12/14] netlink: add documentation for memory mapped I/O

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Date:	Wed, 17 Apr 2013 20:08:06 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Daniel Borkmann <dborkman@...hat.com>
CC:	davem@...emloft.net, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 12/14] netlink: add documentation for memory mapped I/O



Daniel Borkmann <dborkman@...hat.com> schrieb:

>On 04/17/2013 06:47 PM, Patrick McHardy wrote:
>> Signed-off-by: Patrick McHardy <kaber@...sh.net>
>> ---
>[...]
>> +Ring frames
>> +------------
>> +
>> +Each frames contain a frame header, consisting of a synchronization
>word and some
>> +meta-data, and the message itself.
>> +
>> +Frame:	[ header message ]
>> +
>> +The frame header is defined as follows:
>> +
>> +struct nl_mmap_hdr {
>> +	unsigned int	nm_status;
>> +	unsigned int	nm_len;
>> +	__u32		nm_group;
>> +	/* credentials */
>> +	__u32		nm_pid;
>> +	__u32		nm_uid;
>> +	__u32		nm_gid;
>> +};
>
>Hm, just wondering, maybe it could be a safer path to make 'nm_status'
>and 'nm_len' also of fixed width as the rest of nl_mmap_hdr, and as in
>PF_PACKET's tpacket2_hdr and tpacket3_hdr ?
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The size of int is not going to change, but I agree that it is cleaner. I'll send a patch to change this once/if this is merged.

Thanks.
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