netdev - Re: [patch net-next] neigh: use NEIGH_VAR_INIT in ndo_neigh

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Date:	Thu, 16 Jan 2014 08:15:19 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, jes@...ined-monkey.org
Subject: Re: [patch net-next] neigh: use NEIGH_VAR_INIT in ndo_neigh_setup
 functions.

Mon, Jan 13, 2014 at 08:35:38PM CET, davem@...emloft.net wrote:
>From: Jiri Pirko <jiri@...nulli.us>
>Date: Thu,  9 Jan 2014 14:13:47 +0100
>
>> When ndo_neigh_setup is called, the bitfield used by NEIGH_VAR_SET is
>> not initialized yet. This might cause confusion for the people who use
>> NEIGH_VAR_SET in ndo_neigh_setup. So rather introduce NEIGH_VAR_INIT for
>> usage in ndo_neigh_setup.
>> 
>> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>
>Wouldn't it be better to move the neigh_parms_data_state_cleanall() call
>before we invoke ->ndo_neigh_setup()?  It seems that this code intended
>to work that way, no?

Even moving neigh_parms_data_state_cleanall before ndo_neigh_setup
would not solve this. In ndo_neigh_setup the original default value is
changed. If it is changed by NEIGH_VAR_SET, it touches data_state bit
and it looks as if it was changed by user. That is not desired because
default value change would be ignored for this device. Therefore there
is need for NEIGH_VAR_INIT which does not touch data_state bit.

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