netdev - Re: IFF_PROMISC again

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Message-ID: <b9800b70705252342n7ca29111k15f82f86c287e36@mail.gmail.com>
Date:	Sat, 26 May 2007 03:42:20 -0300
From:	"Martín Ferrari" <martin.ferrari@...il.com>
To:	"David Miller" <davem@...emloft.net>
Cc:	greearb@...delatech.com, netdev@...r.kernel.org
Subject: Re: IFF_PROMISC again

Hi David,

On 5/22/07, David Miller <davem@...emloft.net> wrote:

> > Anyone know the reasoning for masking out the PROMISC flag
> > in dev_get_flags() ?
>
> Because promiscuous status is a counter, not a binary
> on-off state.
>
> You can't expect to just clear it and expect all the
> other promiscuous users to just "go away" and be ok
> with the device leaving promiscuous mode.

Yes, this is fully understood.

> Since you can't sanely "set" it, we don't provide it
> either.

I think it's cleaner how is done now, but the needed information is
hidden, not having a proper way of querying the counter or the real
(binary) promiscuous state is a problem for userspace. Do you think
the patch I suggested is not a good idea?

Do you think there is a acceptable way of exporting that info to
userspace? (as I just said to Ben, the /sys/.../flags file doesn't
seem a very clean way of checking it).

-- 
Martín Ferrari
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