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

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Date:	Wed, 17 Apr 2013 20:56:41 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Patrick McHardy <kaber@...sh.net>
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

On 04/17/2013 08:08 PM, Patrick McHardy wrote:
> 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.

Sounds great, thanks !
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