netdev - Re: IFF_PROMISC again

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Message-Id: <20070522.171225.70219741.davem@davemloft.net>
Date:	Tue, 22 May 2007 17:12:25 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	greearb@...delatech.com
Cc:	martin.ferrari@...il.com, netdev@...r.kernel.org
Subject: Re: IFF_PROMISC again

From: Ben Greear <greearb@...delatech.com>
Date: Tue, 22 May 2007 17:08:18 -0700

> 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.

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