linux-toradex.git/net/mac80211/offchannel.c, branch v3.0.29

mac80211: Optimize scans on current operating channel.

2011-02-04T21:30:32+00:00

This should decrease un-necessary flushes, on/off channel work,
and channel changes in cases where the only scanned channel is
the current operating channel.

* Removes SCAN_OFF_CHANNEL flag, uses SDATA_STATE_OFFCHANNEL
  and is-scanning flags instead.

* Add helper method to determine if we are currently configured
  for the operating channel.

* Do no blindly go off/on channel in work.c  Instead, only call
  appropriate on/off code when we really need to change channels.
  Always enable offchannel-ps mode when starting work,
  and disable it when we are done.

* Consolidate ieee80211_offchannel_stop_station and
  ieee80211_offchannel_stop_beaconing, call it
  ieee80211_offchannel_stop_vifs instead.

* Accept non-beacon frames when scanning on operating channel.

* Scan state machine optimized to minimize on/off channel
  transitions.  Also, when going on-channel, go ahead and
  re-enable beaconing.  We're going to be there for 200ms,
  so seems like some useful beaconing could happen.
  Always enable offchannel-ps mode when starting software
  scan, and disable it when we are done.

* Grab local->mtx earlier in __ieee80211_scan_completed_finish
  so that we are protected when calling hw_config(), etc.

* Pass probe-responses up the stack if scanning on local
  channel, so that mlme can take a look.

Signed-off-by: Ben Greear 
Signed-off-by: John W. Linville

mac80211: implement off-channel TX using hw r-o-c offload

2011-01-05T21:07:12+00:00

When the driver has remain-on-channel offload,
implement off-channel transmission using that
primitive.

Signed-off-by: Johannes Berg 
Signed-off-by: John W. Linville

mac80211: implement hardware offload for remain-on-channel

2011-01-05T21:07:12+00:00

This allows drivers to support remain-on-channel
offload if they implement smarter timing or need
to use a device implementation like iwlwifi.

Signed-off-by: Johannes Berg 
Signed-off-by: John W. Linville

mac80211: disable beacon monitor while going offchannel

2010-09-16T19:46:17+00:00

The beacon monitor should be disabled when going off channel
to prevent spurious warnings and triggering connection
deterioration work such as sending probe requests. Re-enable
the beacon monitor once we come back to the home channel.

This patch has fixes for stable kernels [2.6.34+].

Cc: stable@kernel.org
Cc: Paul Stewart 
Cc: Amod Bodas 
Signed-off-by: Luis R. Rodriguez 
Signed-off-by: John W. Linville

mac80211: reset connection idle when going offchannel

2010-09-16T19:46:15+00:00

When we go offchannel mac80211 currently leaves alive the
connection idle monitor. This should be instead postponed
until we come back to our home channel, otherwise by the
time we get back to the home channel we could be triggering
unecesary probe requests. For APs that do not respond to
unicast probe requests (Nexus One is a simple example) this
means we essentially get disconnected after the probes
fails.

This patch has stable fixes for kernels [2.6.35+]

Cc: stable@kernel.org
Cc: Paul Stewart 
Cc: Amod Bodas 
Signed-off-by: Luis R. Rodriguez 
Signed-off-by: John W. Linville

mac80211: fix offchannel queue stop

2010-08-27T17:53:31+00:00

Somebody noticed this problem, and I outlined
to them how to fix it, but haven't heard back
from them. So while I was adding the state
field I figured I could use it to fix it.

The problem, as I understand it, is that when
we go offchannel while the driver has a queue
stopped, the driver will likely start draining
the queue and then enable it while offchannel.
This in turn will enable the interface queue,
and that leads to transmitting data frames on
the wrong channel.

Fix this by keeping track of offchannel status
per interface, and not enabling the interface
queues on interfaces that are offchannel when
the driver enables a queue.

Signed-off-by: Johannes Berg 
Signed-off-by: John W. Linville

mac80211: Fixed netif_tx_wake_all_queues in IBSS mode

2010-01-15T21:58:28+00:00

When ieee80211_offchannel_return is called, it needs to re-enabled TX
queues that have been stopped in ieee80211_offchannel_stop_beaconing or
ieee80211_offchannel_stop_station. It happens if we are doing a scan with an
IBSS interface. In this case, the interface stopped transmitting.

Signed-off-by: Benoit Papillault 
Signed-off-by: John W. Linville

Merge git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6

2010-01-06T22:26:13+00:00

Conflicts:
	net/mac80211/scan.c
	net/mac80211/wme.c

mac80211: support remain-on-channel command

2009-12-28T21:55:03+00:00

This implements the new remain-on-channel cfg80211
command in mac80211, extending the work interface.

Also change the work purge code to be able to clean
up events properly (pretending they timed out.)

Signed-off-by: Jouni Malinen 
Signed-off-by: Johannes Berg 
Signed-off-by: John W. Linville

mac80211: Generalize off-channel operation helpers from scan code

2009-12-28T21:55:01+00:00

The off-channel operations for going into power save mode (station
mode) or stop beaconing (AP/IBSS) are not limited to scanning. Move
these into a separate file and allow them to be used for other
purposes, too.

Signed-off-by: Jouni Malinen 
Signed-off-by: Johannes Berg 
Signed-off-by: John W. Linville