netdev - Re: [PATCH wpan-next 10/20] net: mac802154: Handle passive scanning

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Date:   Mon, 1 Aug 2022 19:42:08 -0400
From:   Alexander Aring <aahringo@...hat.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Network Development <netdev@...r.kernel.org>,
        David Girault <david.girault@...vo.com>,
        Romuald Despres <romuald.despres@...vo.com>,
        Frederic Blain <frederic.blain@...vo.com>,
        Nicolas Schodet <nico@...fr.eu.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH wpan-next 10/20] net: mac802154: Handle passive scanning

Hi,

On Thu, Jul 14, 2022 at 11:33 PM Alexander Aring <aahringo@...hat.com> wrote:
...
>
> I know some driver datasheets and as I said before, it's not allowed
> to set promiscuous mode while in receive mode. We need to stop tx,
> what we are doing. Then call stop() driver callback,
> synchronize_net(), mac802154_set_promiscuous_mode(...), start(). The
> same always for the opposite.
>

I think we should try to work on that as a next patch series to offer
such functionality in which "filtering level" the hardware should be
"started". As I said it cannot be changed during runtime as
"transceiver is being in receive mode" but there is the possibility to
stop/start the hardware _transparent_ from the user to change the
"filtering level". I say filtering level because I think this is what
the standard uses as a term. The one which is needed here is
promiscuous mode, otherwise yea we usually use the highest filtering
level. When changing the "filtering level" it depends on interface
type what we need to filter in softmac then and what's not. One thing
in promiscuous mode and everything else than monitor is to check on if
the checksum is valid and drop if necessary, same for address
filtering, etc. I don't assume that the software filtering is 100%
correct, but we should have a basis to adding more filters if
necessary and we found something is missing?

What do you think?

 - Alex