From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Alexander Aring <aahringo@redhat.com>
Cc: Alexander Aring <alex.aring@gmail.com>,
Stefan Schmidt <stefan@datenfreihafen.org>,
linux-wpan - ML <linux-wpan@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Eric Dumazet <edumazet@google.com>,
Network Development <netdev@vger.kernel.org>,
David Girault <david.girault@qorvo.com>,
Romuald Despres <romuald.despres@qorvo.com>,
Frederic Blain <frederic.blain@qorvo.com>,
Nicolas Schodet <nico@ni.fr.eu.org>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Subject: Re: [PATCH wpan-next 10/20] net: mac802154: Handle passive scanning
Date: Fri, 19 Aug 2022 19:22:28 +0200 [thread overview]
Message-ID: <20220819192228.7c76e86c@xps-13> (raw)
In-Reply-To: <CAK-6q+g5Co049ZED0fKkeh_k9mdRvm_wrgi4ostDBvN71UWcrA@mail.gmail.com>
Hi Alexander,
aahringo@redhat.com wrote on Thu, 14 Jul 2022 23:42:08 -0400:
> Hi,
>
> On Thu, Jul 14, 2022 at 11:33 PM Alexander Aring <aahringo@redhat.com> wrote:
> >
> > Hi,
> >
> > On Fri, Jul 1, 2022 at 10:36 AM Miquel Raynal <miquel.raynal@bootlin.com> wrote:
> > >
> > > Implement the core hooks in order to provide the softMAC layer support
> > > for passive scans. Scans are requested by the user and can be aborted.
> > >
> > > Changing the channels is prohibited during the scan.
> > >
> > > As transceivers enter promiscuous mode during scans, they might stop
> > > checking frame validity so we ensure this gets done at mac level.
> > >
> > > The implementation uses a workqueue triggered at a certain interval
> > > depending on the symbol duration for the current channel and the
> > > duration order provided.
> > >
> > > Received beacons during a passive scan are processed also in a work
> > > queue and forwarded to the upper layer.
> > >
> > > Active scanning is not supported yet.
> > >
> > > Co-developed-by: David Girault <david.girault@qorvo.com>
> > > Signed-off-by: David Girault <david.girault@qorvo.com>
> > > Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> > > ---
> > > include/linux/ieee802154.h | 4 +
> > > include/net/cfg802154.h | 12 ++
> > > net/mac802154/Makefile | 2 +-
> > > net/mac802154/cfg.c | 39 ++++++
> > > net/mac802154/ieee802154_i.h | 29 ++++
> > > net/mac802154/iface.c | 6 +
> > > net/mac802154/main.c | 4 +
> > > net/mac802154/rx.c | 49 ++++++-
> > > net/mac802154/scan.c | 264 +++++++++++++++++++++++++++++++++++
> > > 9 files changed, 405 insertions(+), 4 deletions(-)
> > > create mode 100644 net/mac802154/scan.c
> > >
[...]
> > > +int mac802154_trigger_scan_locked(struct
ieee802154_sub_if_data *sdata,
> > > + struct cfg802154_scan_request *request)
> > > +{
> > > + struct ieee802154_local *local = sdata->local;
> > > + int ret;
> > > +
> > > + lockdep_assert_held(&local->scan_lock);
> > > +
> > > + if (mac802154_is_scanning(local))
> > > + return -EBUSY;
> > > +
> > > + /* TODO: support other scanning type */
> > > + if (request->type != NL802154_SCAN_PASSIVE)
> > > + return -EOPNOTSUPP;
> > > +
> > > + /* Store scanning parameters */
> > > + rcu_assign_pointer(local->scan_req, request);
> > > +
> > > + /* Software scanning requires to set promiscuous mode, so we need to
> > > + * pause the Tx queue during the entire operation.
> > > + */
> > > + ieee802154_mlme_op_pre(local);
> > > +
> > > + ret = mac802154_set_promiscuous_mode(local, true);
> > > + if (ret)
> > > + goto cancel_mlme;
> >
> > 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.
>
> s/always/as well/
Mmmh. I didn't know. I will look into it.
> I need to say, it needs to be something like that... we need to be
> careful here e.g. lots of monitor interfaces on one phy which has
> currently a serious use case for hwsim.
>
> We also don't need to do anything above if we already are in
> promiscuous mode, which might be worth checking.
True!
Thanks,
Miquèl
next prev parent reply other threads:[~2022-08-19 17:50 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-01 14:30 [PATCH wpan-next 00/20] net: ieee802154: Support scanning/beaconing Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 01/20] net: mac802154: Allow the creation of coordinator interfaces Miquel Raynal
2022-07-06 1:51 ` Alexander Aring
2022-08-19 17:11 ` Miquel Raynal
2022-08-23 12:33 ` Alexander Aring
2022-08-23 16:29 ` Miquel Raynal
2022-08-23 21:44 ` Alexander Aring
2022-08-24 7:35 ` Miquel Raynal
2022-08-24 21:43 ` Alexander Aring
2022-08-25 8:40 ` Miquel Raynal
2022-08-26 0:51 ` Alexander Aring
2022-08-26 1:35 ` Alexander Aring
2022-08-26 8:08 ` Miquel Raynal
2022-08-29 2:31 ` Alexander Aring
2022-08-29 8:05 ` Miquel Raynal
2022-08-26 7:30 ` Miquel Raynal
2022-08-24 10:20 ` Miquel Raynal
2022-08-24 12:43 ` Alexander Aring
2022-08-24 13:26 ` Miquel Raynal
2022-08-24 21:53 ` Alexander Aring
2022-08-25 1:02 ` Alexander Aring
2022-08-25 8:46 ` Miquel Raynal
2022-08-25 12:58 ` Miquel Raynal
2022-08-26 1:05 ` Alexander Aring
2022-08-26 7:54 ` Miquel Raynal
2022-08-29 2:52 ` Alexander Aring
2022-08-29 8:02 ` Miquel Raynal
2022-08-30 2:23 ` Alexander Aring
2022-08-31 15:39 ` Miquel Raynal
2022-09-01 0:09 ` Miquel Raynal
2022-09-01 13:09 ` Miquel Raynal
2022-09-02 2:38 ` Alexander Aring
2022-09-03 0:08 ` Miquel Raynal
2022-09-03 14:20 ` Alexander Aring
2022-09-03 14:31 ` Alexander Aring
2022-09-03 16:05 ` Miquel Raynal
2022-09-03 18:21 ` Alexander Aring
2022-09-03 18:29 ` Alexander Aring
2022-09-03 19:07 ` Alexander Aring
2022-09-03 19:10 ` Alexander Aring
2022-09-03 19:40 ` Alexander Aring
2022-09-05 3:16 ` Miquel Raynal
2022-09-05 22:35 ` Alexander Aring
2022-09-02 2:23 ` Alexander Aring
2022-09-02 2:39 ` Alexander Aring
2022-09-02 2:09 ` Alexander Aring
2022-07-01 14:30 ` [PATCH wpan-next 02/20] net: ieee802154: Advertize coordinators discovery Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 03/20] net: ieee802154: Handle " Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 04/20] net: ieee802154: Trace the registration of new PANs Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 05/20] net: ieee802154: Define frame types Miquel Raynal
2022-07-11 2:06 ` Alexander Aring
2022-08-19 17:13 ` Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 06/20] net: ieee802154: Add support for user scanning requests Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 07/20] net: ieee802154: Define a beacon frame header Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 08/20] net: mac802154: Prepare forcing specific symbol duration Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 09/20] net: mac802154: Introduce a global device lock Miquel Raynal
2022-07-04 1:12 ` Alexander Aring
2022-08-19 17:06 ` Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 10/20] net: mac802154: Handle passive scanning Miquel Raynal
2022-07-15 3:33 ` Alexander Aring
2022-07-15 3:42 ` Alexander Aring
2022-08-19 17:22 ` Miquel Raynal [this message]
2022-08-01 23:42 ` Alexander Aring
2022-08-01 23:54 ` Alexander Aring
2022-07-01 14:30 ` [PATCH wpan-next 11/20] net: ieee802154: Add support for user beaconing requests Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 12/20] net: mac802154: Handle basic beaconing Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 13/20] net: ieee802154: Add support for user active scan requests Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 14/20] net: mac802154: Handle active scanning Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 15/20] net: ieee802154: Add support for allowing to answer BEACON_REQ Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 16/20] net: mac802154: Handle received BEACON_REQ Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 17/20] net: ieee802154: Handle limited devices with only datagram support Miquel Raynal
2022-07-15 3:16 ` Alexander Aring
2022-08-19 17:13 ` Miquel Raynal
2022-08-23 12:43 ` Alexander Aring
2022-07-01 14:30 ` [PATCH wpan-next 18/20] ieee802154: ca8210: Flag the driver as being limited Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 19/20] ieee802154: hwsim: Do not check the rtnl Miquel Raynal
2022-07-06 1:23 ` Alexander Aring
2022-08-01 23:58 ` Alexander Aring
2022-08-19 17:09 ` Miquel Raynal
2022-08-25 22:41 ` Miquel Raynal
2022-07-01 14:30 ` [PATCH wpan-next 20/20] ieee802154: hwsim: Allow devices to be coordinators Miquel Raynal
2022-07-11 2:01 ` Alexander Aring
2022-08-19 17:12 ` Miquel Raynal
2022-07-04 1:17 ` [PATCH wpan-next 00/20] net: ieee802154: Support scanning/beaconing Alexander Aring
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