Commit Graph

102 Commits

Author SHA1 Message Date
Alexander Wetzel 39c1134c66 mac80211: fix TX aggregation stop race
The mac80211 tear down code is not waiting for the driver call back.
This can bring down the the TX path (TID) till the user manually
reconnects. (Observed with iwldvm and enabled TX aggregation.)

The race can be prevented when the ampdu_mlme worker handles the tear
down.

The race:
 * ieee80211_sta_tear_down_BA_sessions calls
   ___ieee80211_stop_tx_ba_session for all TIDs,

 * then cancels the ampdu_mlme worker

 * and cleanups the TIDs the driver already has called back for.

 * ieee80211_stop_tx_ba_cb will never be called for a TID if the callback
   came after the the check in ieee80211_sta_tear_down_BA_sessions.

Signed-off-by: Alexander Wetzel <Alexander.Wetzel@web.de>
[johannes: "enabled" -> "blocked" and invert logic, simplify init]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2018-05-18 11:14:36 +02:00
tamizhr@codeaurora.org 57566b2003 mac80211: Use proper smps_mode enum in sta opmode event
SMPS_MODE change value notified via nl80211 contains mac80211
specific value(ieee80211_smps_mode) and user space application
will not know those values. This patch add support to map
the mac80211 enum value to nl80211_smps_mode which will be
understood by the userspace application.

Signed-off-by: Tamizh chelvam <tamizhr@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2018-03-29 10:19:55 +02:00
David S. Miller 72deacce01 We have things all over the place, no point listing them.
One thing is notable: I applied two patches and later
 reverted them - we'll get back to that once all the driver
 situation is sorted out.
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Merge tag 'mac80211-next-for-davem-2018-01-04' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next

Johannes Berg says:

====================
We have things all over the place, no point listing them.

One thing is notable: I applied two patches and later
reverted them - we'll get back to that once all the driver
situation is sorted out.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2018-01-04 14:33:29 -05:00
Gustavo A. R. Silva 02049ce27e mac80211: mark expected switch fall-throughs
In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Notice that in some cases I replaced "fall through on else" and
"otherwise fall through" comments with just a "fall through" comment,
which is what GCC is expecting to find.

Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-12-11 12:16:04 +01:00
Johannes Berg 0afe9d4ab9 mac80211: fix locking in ieee80211_sta_tear_down_BA_sessions
Due to overlap between
commit 1281103770 ("mac80211: Simplify locking in ieee80211_sta_tear_down_BA_sessions()")
and the way that Luca modified
commit 72e2c3438b ("mac80211: tear down RX aggregations first")
when sending it upstream from Intel's internal tree, we get
the following warning:

WARNING: CPU: 0 PID: 5472 at net/mac80211/agg-tx.c:315 ___ieee80211_stop_tx_ba_session+0x158/0x1f0

since there's no appropriate locking around the call to
___ieee80211_stop_tx_ba_session; Sara's original just had
a call to the locked __ieee80211_stop_tx_ba_session (one
less underscore) but it looks like Luca modified both of
the calls when fixing it up for upstream, leading to the
problem at hand.

Move the locking appropriately to fix this problem.

Reported-by: Kalle Valo <kvalo@codeaurora.org>
Reported-by: Pavel Machek <pavel@ucw.cz>
Tested-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-12-11 10:50:00 +01:00
Sara Sharon 72e2c3438b mac80211: tear down RX aggregations first
When doing HW restart we tear down aggregations.
Since at this point we are not TX'ing any aggregation, while
the peer is still sending RX aggregation over the air, it will
make sense to tear down the RX aggregations first.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-11-27 11:24:59 +01:00
Ilan peer 1281103770 mac80211: Simplify locking in ieee80211_sta_tear_down_BA_sessions()
Simplify the locking in  ieee80211_sta_tear_down_BA_sessions() and
lock sta->ampdu_mlme.mtx over the entire function instead of
locking/unlocking it for each TID etc.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-09-21 11:42:01 +02:00
Johannes Berg bde59c475e mac80211: fix deadlock in driver-managed RX BA session start
When an RX BA session is started by the driver, and it has to tell
mac80211 about it, the corresponding bit in tid_rx_manage_offl gets
set and the BA session work is scheduled. Upon testing this bit, it
will call __ieee80211_start_rx_ba_session(), thus deadlocking as it
already holds the ampdu_mlme.mtx, which that acquires again.

Fix this by adding ___ieee80211_start_rx_ba_session(), a version of
the function that requires the mutex already held.

Cc: stable@vger.kernel.org
Fixes: 699cb58c8a ("mac80211: manage RX BA session offload without SKB queue")
Reported-by: Matteo Croce <mcroce@redhat.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-09-06 15:22:02 +02:00
Ilan peer 98e93e968e mac80211: Complete ampdu work schedule during session tear down
Commit 7a7c0a6438 ("mac80211: fix TX aggregation start/stop callback race")
added a cancellation of the ampdu work after the loop that stopped the
Tx and Rx BA sessions. However, in some cases, e.g., during HW reconfig,
the low level driver might call mac80211 APIs to complete the stopping
of the BA sessions, which would queue the ampdu work to handle the actual
completion. This work needs to be performed as otherwise mac80211 data
structures would not be properly synced.

Fix this by checking if BA session STOP_CB bit is set after the BA session
cancellation and properly clean the session.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
[Johannes: the work isn't flushed because that could do other things we
 don't want, and the locking situation isn't clear]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-09-06 15:22:02 +02:00
Johannes Berg 4df864c1d9 networking: make skb_put & friends return void pointers
It seems like a historic accident that these return unsigned char *,
and in many places that means casts are required, more often than not.

Make these functions (skb_put, __skb_put and pskb_put) return void *
and remove all the casts across the tree, adding a (u8 *) cast only
where the unsigned char pointer was used directly, all done with the
following spatch:

    @@
    expression SKB, LEN;
    typedef u8;
    identifier fn = { skb_put, __skb_put };
    @@
    - *(fn(SKB, LEN))
    + *(u8 *)fn(SKB, LEN)

    @@
    expression E, SKB, LEN;
    identifier fn = { skb_put, __skb_put };
    type T;
    @@
    - E = ((T *)(fn(SKB, LEN)))
    + E = fn(SKB, LEN)

which actually doesn't cover pskb_put since there are only three
users overall.

A handful of stragglers were converted manually, notably a macro in
drivers/isdn/i4l/isdn_bsdcomp.c and, oddly enough, one of the many
instances in net/bluetooth/hci_sock.c. In the former file, I also
had to fix one whitespace problem spatch introduced.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 11:48:39 -04:00
Johannes Berg b080db5853 networking: convert many more places to skb_put_zero()
There were many places that my previous spatch didn't find,
as pointed out by yuan linyu in various patches.

The following spatch found many more and also removes the
now unnecessary casts:

    @@
    identifier p, p2;
    expression len;
    expression skb;
    type t, t2;
    @@
    (
    -p = skb_put(skb, len);
    +p = skb_put_zero(skb, len);
    |
    -p = (t)skb_put(skb, len);
    +p = skb_put_zero(skb, len);
    )
    ... when != p
    (
    p2 = (t2)p;
    -memset(p2, 0, len);
    |
    -memset(p, 0, len);
    )

    @@
    type t, t2;
    identifier p, p2;
    expression skb;
    @@
    t *p;
    ...
    (
    -p = skb_put(skb, sizeof(t));
    +p = skb_put_zero(skb, sizeof(t));
    |
    -p = (t *)skb_put(skb, sizeof(t));
    +p = skb_put_zero(skb, sizeof(t));
    )
    ... when != p
    (
    p2 = (t2)p;
    -memset(p2, 0, sizeof(*p));
    |
    -memset(p, 0, sizeof(*p));
    )

    @@
    expression skb, len;
    @@
    -memset(skb_put(skb, len), 0, len);
    +skb_put_zero(skb, len);

Apply it to the tree (with one manual fixup to keep the
comment in vxlan.c, which spatch removed.)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 11:48:35 -04:00
Johannes Berg 699cb58c8a mac80211: manage RX BA session offload without SKB queue
Instead of using the SKB queue with the fake pkt_type for the
offloaded RX BA session management, also handle this with the
normal aggregation state machine worker. This also makes the
use of this more reliable since it gets rid of the allocation
of the fake skb.

Combined with the previous patch, this finally allows us to
get rid of the pkt_type hack entirely, so do that as well.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-06-08 14:16:29 +02:00
Johannes Berg 7a7c0a6438 mac80211: fix TX aggregation start/stop callback race
When starting or stopping an aggregation session, one of the steps
is that the driver calls back to mac80211 that the start/stop can
proceed. This is handled by queueing up a fake SKB and processing
it from the normal iface/sdata work. Since this isn't flushed when
disassociating, the following race is possible:

 * associate
 * start aggregation session
 * driver callback
 * disassociate
 * associate again to the same AP
 * callback processing runs, leading to a WARN_ON() that
   the TID hadn't requested aggregation

If the second association isn't to the same AP, there would only
be a message printed ("Could not find station: <addr>"), but the
same race could happen.

Fix this by not going the whole detour with a fake SKB etc. but
simply looking up the aggregation session in the driver callback,
marking it with a START_CB/STOP_CB bit and then scheduling the
regular aggregation work that will now process these bits as well.
This also simplifies the code and gets rid of the whole problem
with allocation failures of said skb, which could have left the
session in limbo.

Reported-by: Jouni Malinen <j@w1.fi>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2017-05-30 09:08:40 +02:00
Emmanuel Grumbach 506bcfa8ab mac80211: limit the A-MSDU Tx based on peer's capabilities
In VHT, the specification allows to limit the number of
MSDUs in an A-MSDU in the Extended Capabilities IE. There
is also a limitation on the byte size in the VHT IE.
In HT, the only limitation is on the byte size.
Parse the capabilities from the peer and make them
available to the driver.

In HT, there is another limitation when a BA agreement
is active: the byte size can't be greater than 4095.
This is not enforced here.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2016-02-24 09:04:20 +01:00
Janusz.Dziedzic@tieto.com abcff6ef01 mac80211: add VHT support for IBSS
Add VHT support for IBSS. Drivers could activate
this feature by setting NL80211_EXT_FEATURE_VHT_IBSS
flag.

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-03-30 10:48:26 +02:00
Arik Nemtsov dc5943d540 mac80211: set Rx highest rate in ht_cap
Set for completeness mostly, currently unused in the code.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-07-21 12:14:04 +02:00
Arik Nemtsov 13cc8a4a1d mac80211: support HT for TDLS stations
Add the HT capabilities and HT operation information elements to TDLS
setup packets where appropriate.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-07-21 12:14:04 +02:00
Jouni Malinen 9a07bf507d mac80211: Allow HT capa override to add 40 MHz intolerant
This can be useful for testing purposes to confirm valid AP behavior on
HT 20/40 co-existence functionality.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-04-22 17:23:19 +02:00
Pawel Kulakowski a2e7495d63 mac80211: Allow disabling LDPC
This allows user-space (wpa_supplicant) to disable LDPC coding.

Signed-off-by: Pawel Kulakowski <pawel.kulakowski@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-04-09 10:56:00 +02:00
Luciano Coelho 30f55dc171 mac80211: allow drivers to request SMPS off
Previously we were warning and using automatic when a driver sent an
update request with SMPS off.  This patch makes it possible for
drivers to disable SMPS at runtime, for whatever reason.

Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-02-21 09:28:52 +01:00
John W. Linville 0e028ab0fb Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless 2014-02-13 14:43:02 -05:00
Emmanuel Grumbach 8ffcc704c9 mac80211: avoid deadlock revealed by lockdep
sdata->u.ap.request_smps_work can’t be flushed synchronously
under wdev_lock(wdev) since ieee80211_request_smps_ap_work
itself locks the same lock.
While at it, reset the driver_smps_mode when the ap is
stopped to its default: OFF.

This solves:

======================================================
[ INFO: possible circular locking dependency detected ]
3.12.0-ipeer+ #2 Tainted: G           O
-------------------------------------------------------
rmmod/2867 is trying to acquire lock:
  ((&sdata->u.ap.request_smps_work)){+.+...}, at: [<c105b8d0>] flush_work+0x0/0x90

but task is already holding lock:
  (&wdev->mtx){+.+.+.}, at: [<f9b32626>] cfg80211_stop_ap+0x26/0x230 [cfg80211]

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #1 (&wdev->mtx){+.+.+.}:
        [<c10aefa9>] lock_acquire+0x79/0xe0
        [<c1607a1a>] mutex_lock_nested+0x4a/0x360
        [<fb06288b>] ieee80211_request_smps_ap_work+0x2b/0x50 [mac80211]
        [<c105cdd8>] process_one_work+0x198/0x450
        [<c105d469>] worker_thread+0xf9/0x320
        [<c10669ff>] kthread+0x9f/0xb0
        [<c1613397>] ret_from_kernel_thread+0x1b/0x28

-> #0 ((&sdata->u.ap.request_smps_work)){+.+...}:
        [<c10ae9df>] __lock_acquire+0x183f/0x1910
        [<c10aefa9>] lock_acquire+0x79/0xe0
        [<c105b917>] flush_work+0x47/0x90
        [<c105d867>] __cancel_work_timer+0x67/0xe0
        [<c105d90f>] cancel_work_sync+0xf/0x20
        [<fb0765cc>] ieee80211_stop_ap+0x8c/0x340 [mac80211]
        [<f9b3268c>] cfg80211_stop_ap+0x8c/0x230 [cfg80211]
        [<f9b0d8f9>] cfg80211_leave+0x79/0x100 [cfg80211]
        [<f9b0da72>] cfg80211_netdev_notifier_call+0xf2/0x4f0 [cfg80211]
        [<c160f2c9>] notifier_call_chain+0x59/0x130
        [<c106c6de>] __raw_notifier_call_chain+0x1e/0x30
        [<c106c70f>] raw_notifier_call_chain+0x1f/0x30
        [<c14f8213>] call_netdevice_notifiers_info+0x33/0x70
        [<c14f8263>] call_netdevice_notifiers+0x13/0x20
        [<c14f82a4>] __dev_close_many+0x34/0xb0
        [<c14f83fe>] dev_close_many+0x6e/0xc0
        [<c14f9c77>] rollback_registered_many+0xa7/0x1f0
        [<c14f9dd4>] unregister_netdevice_many+0x14/0x60
        [<fb06f4d9>] ieee80211_remove_interfaces+0xe9/0x170 [mac80211]
        [<fb055116>] ieee80211_unregister_hw+0x56/0x110 [mac80211]
        [<fa3e9396>] iwl_op_mode_mvm_stop+0x26/0xe0 [iwlmvm]
        [<f9b9d8ca>] _iwl_op_mode_stop+0x3a/0x70 [iwlwifi]
        [<f9b9d96f>] iwl_opmode_deregister+0x6f/0x90 [iwlwifi]
        [<fa405179>] __exit_compat+0xd/0x19 [iwlmvm]
        [<c10b8bf9>] SyS_delete_module+0x179/0x2b0
        [<c1613421>] sysenter_do_call+0x12/0x32

Fixes: 687da13223 ("mac80211: implement SMPS for AP")
Cc: <stable@vger.kernel.org> [3.13]
Reported-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-02-06 09:55:18 +01:00
Karl Beldan c6e133277b mac80211: send {ADD,DEL}BA on AC_VO like other mgmt frames, as per spec
ATM, {ADD,DEL}BA and BAR frames are sent on the AC matching the TID of
the BA parameters. In the discussion [1] about this patch, Johannes
recalled that it fixed some races with the DELBA and indeed this
behavior was introduced in [2].
While [2] is right for the BARs, the part queueing the {ADD,DEL}BAs on
their BA params TID AC violates the spec and is more a workaround for
some drivers. Helmut expressed some concerns wrt such drivers, in
particular DELBAs in rt2x00.

ATM, DELBAs are sent after a driver has called (hence "purposely")
ieee80211_start_tx_ba_cb_irqsafe and Johannes and Emmanuel gave some
details wrt intentions behind the split of the IEEE80211_AMPDU_TX_STOP_*
given to the driver ampdu_action supposed to call this function, which
could prove handy to people trying to do the right thing in faulty
drivers (if their fw/hw don't get in their way).

[1] http://mid.gmane.org/1390391564-18481-1-git-send-email-karl.beldan@gmail.com
[2] Commit: cf6bb79ad8 ("mac80211: Use appropriate TID for sending BAR, ADDBA and DELBA frames")

Signed-off-by: Karl Beldan <karl.beldan@rivierawaves.com>
Cc: Helmut Schaa <helmut.schaa@googlemail.com>
Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-02-04 21:48:28 +01:00
Emmanuel Grumbach 349b196044 mac80211: allow to set smps mode to OFF in AP mode
In managed mode, we should not ask for OFF mode because the
power settings may still require DYNAMIC. In AP mode, this
should be allowed since the default settings is OFF and
AUTOMATIC is not allowed.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-01-07 16:25:49 +01:00
Emmanuel Grumbach 687da13223 mac80211: implement SMPS for AP
When the driver requests to move to STATIC or DYNAMIC SMPS,
we send an action frame to each associated station and
reconfigure the channel context / driver.
Of course, non-MIMO stations are ignored.

The beacon isn't updated. The association response will
include the original capabilities. Stations that associate
while in non-OFF SMPS mode will get an action frame right
after association to inform them about our current state.
Note that we wait until the end of the EAPOL. Sending an
action frame before the EAPOL is finished can be an issue
for a few clients. Clients aren't likely to send EAPOL
frames in MIMO anyway.

When the SMPS configuration gets more permissive (e.g.
STATIC -> OFF), we don't wake up stations that are asleep
We remember that they don't know about the change and send
the action frame when they wake up.

When the SMPS configuration gets more restrictive (e.g.
OFF -> STATIC), we set the TIM bit for every sleeping STA.
uAPSD stations might send MIMO until they poll the action
frame, but this is for a short period of time.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
[fix vht streams loop, initialisation]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-10-28 15:05:11 +01:00
Simon Wunderlich 822854b0b1 mac80211: enable HT overrides for ibss
Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
2013-07-16 09:57:57 +03:00
Ben Greear e562078a19 mac80211: Ensure tid_start_tx is protected by sta->lock
All accesses of the tid_start_tx lock should be protected
by sta->lock if there is any chance that another thread
could still be accessing the sta object.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-06-13 10:27:07 +02:00
Johannes Berg 8d61ffa5e0 cfg80211/mac80211: use cfg80211 wdev mutex in mac80211
Using separate locks in cfg80211 and mac80211 has always
caused issues, for example having to unlock in places in
mac80211 to call cfg80211, which even needed a framework
to make cfg80211 calls after some functions returned etc.

Additionally, I suspect some issues people have reported
with the cfg80211 state getting confused could be due to
such issues, when cfg80211 is asking mac80211 to change
state but mac80211 is in the process of telling cfg80211
that the state changed (in another way.)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-05-25 00:02:16 +02:00
Johannes Berg c07270b605 mac80211: fix HT capability overrides for AP station
HT capabilites are asymmetric -- e.g. beamforming is both an
RX and TX capability. If, for example, we support RX but not
TX, the RX capability of the AP station is masked out (if it
supports it). This works correctly if it's really the driver
capability.

If, on the other hand, the reason for not supporting TX BF
is that it was removed by HT capability overrides then the
wrong thing happens: the AP's TX capability will be removed
rather than its RX capability, because the override function
works on own capabilities, not remote ones, and doesn't take
the asymmetry into account.

To fix this make a copy of our own capabilities, apply the
overrides to them (where needed) and then use that to set up
the peer's capabilities.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-03-06 16:36:02 +01:00
Johannes Berg 4f4b9357e4 mac80211: don't apply HT overrides to TDLS peers
The HT overrides are intended only for the connection
to the AP, not for any other purpose. Therefore, don't
apply them to TDLS peers that are also stations added
to a managed station interface.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-03-06 16:36:02 +01:00
Johannes Berg af0ed69bad mac80211: stop modifying HT SMPS capability
Instead of modifying the HT SMPS capability field
for stations, track the SMPS mode explicitly in a
new field in the station struct and use it in the
drivers that care about it. This simplifies the
code using it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-02-15 09:41:41 +01:00
Johannes Berg 4a3cb702b0 mac80211: constify IE parsing
Make all the parsed IE pointers const, and propagate
the change to all the users etc.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-02-15 09:41:39 +01:00
Johannes Berg 0af83d3df5 mac80211: handle VHT operating mode notification
Handle the operating mode notification action frame.
When the supported streams or the bandwidth change
let the driver and rate control algorithm know.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-02-15 09:41:32 +01:00
Johannes Berg e1a0c6b3a4 mac80211: stop toggling IEEE80211_HT_CAP_SUP_WIDTH_20_40
For VHT, many more bandwidth changes are possible. As a first
step, stop toggling the IEEE80211_HT_CAP_SUP_WIDTH_20_40 flag
in the HT capabilities and instead introduce a bandwidth field
indicating the currently usable bandwidth to transmit to the
station. Of course, make all drivers use it.

To achieve this, make ieee80211_ht_cap_ie_to_sta_ht_cap() get
the station as an argument, rather than the new capabilities,
so it can set up the new bandwidth field.

If the station is a VHT station and VHT bandwidth is in use,
also set the bandwidth accordingly.

Doing this allows us to get rid of the supports_40mhz flag as
the HT capabilities now reflect the true capability instead of
the current setting.

While at it, also fix ieee80211_ht_cap_ie_to_sta_ht_cap() to not
ignore HT cap overrides when MCS TX isn't supported (not that it
really happens...)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-02-15 09:41:30 +01:00
Emmanuel Grumbach 66d5757051 mac80211: allow driver to be stateless wrt. SMSP requests
Bail out if no update is made to the SMPS state. This
allows the driver to avoid duplicating the state.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-02-12 10:10:28 +01:00
Johannes Berg 21add825f9 mac80211: unset peer's HT 40 MHz support if not usable
When an interface is configured to a 20 MHz channel
and the device as well as the peer are 40 MHz capable
the HT capabilities of the peer are not restricted to
20 MHz, even though they're supposed to be restricted
to the currently possible capabilities.

Unset the 40 MHz HT capability bits in this case.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-01-03 13:01:45 +01:00
Johannes Berg c82c4a80bb mac80211: split aggregation stop by reason
The initiator/tx doesn't really identify why an
aggregation session is stopped, give a reason
for stopping that more clearly identifies what's
going on. This will help tell the driver clearly
what is expected of it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-01-03 13:01:41 +01:00
Ben Greear bc0784d951 mac80211: Allow disabling SGI-20
This allows user-space (wpa_supplicant) to disable
short guard interval (SGI) for 20Mhz.  The SGI-40
disable option is already handled.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-01-03 13:01:14 +01:00
Johannes Berg 5a306f5887 mac80211: introduce IEEE80211_NUM_TIDS and use it
Introduce IEEE80211_NUM_TIDS in the generic 802.11
header file and use it in place of STA_TID_NUM and
NUM_RX_DATA_QUEUES which are both really the number
of TIDs.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2012-11-19 15:44:00 +01:00
Johannes Berg bdcbd8e0e3 mac80211: clean up debugging
There are a few things that make the logging and
debugging in mac80211 less useful than it should
be right now:
 * a lot of messages should be pr_info, not pr_debug
 * wholesale use of pr_debug makes it require *both*
   Kconfig and dynamic configuration
 * there are still a lot of ifdefs
 * the style is very inconsistent, sometimes the
   sdata->name is printed in front

Clean up everything, introducing new macros and
separating out the station MLME debugging into
a new Kconfig symbol.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2012-06-24 11:32:29 +02:00
Joe Perches e87cc4728f net: Convert net_ratelimit uses to net_<level>_ratelimited
Standardize the net core ratelimited logging functions.

Coalesce formats, align arguments.
Change a printk then vprintk sequence to use printf extension %pV.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-15 13:45:03 -04:00
Johannes Berg 24398e39c8 mac80211: set HT channel before association
Changing the channel type during operation is
confusing to some drivers and will be hard to
handle in multi-channel scenarios. Instead of
changing the channel, set it to the right HT
channel before authenticating/associating and
don't change it -- just update the 20/40 MHz
restrictions in rate control as needed when
changed by the AP.

This also fixes a problem that Paul missed in
his fix for the "regulatory makes us deaf"
issue -- when we couldn't use 40 MHz we still
associated saying we were using 40 MHz, which
could in similarly broken APs make us never
even connect successfully.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2012-04-10 14:54:07 -04:00
Helmut Schaa cf6bb79ad8 mac80211: Use appropriate TID for sending BAR, ADDBA and DELBA frames
Currently BAR, ADDBA and DELBA frames are always sent using AC_VO. If
the TID for which a BA session is established is assigned to a different
queue BAR, ADDBA and DELBA frames can "overtake" frames of the according
BA session.

Hence, always put BA session related frames into the same queue as the
BA sessions data frames.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-12-15 14:46:35 -05:00
Ben Greear 4e79fada02 mac80211: Remove WARN_ON in apply-ht-override logic.
AP interfaces routinely call this logic, so just silently
return when this happens instead of splatting the kernel
logs.

Reported-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-12-06 16:07:07 -05:00
Alexander Simon 13c40c5468 mac80211: Add HT operation modes for IBSS
The HT mode is set by iw (previous patchsets).
The interface is set into the specified HT mode.
HT mode and capabilities are announced in beacons.

If we add a station that uses HT also, the fastest matching HT mode will
be used for transmission. That means if we are using HT40+ and we add a station
running on HT40-, we would transfer at HT20.

If we join an IBSS with HT40, but the secondary channel is not
available, we will fall back into HT20 as well.

Allow frame aggregation to start in IBSS mode.

Signed-off-by: Alexander Simon <an.alexsimon@googlemail.com>
[siwu@hrz.tu-chemnitz.de: Updates]
* remove implicit channel_type enum assumptions
* use rate_control_rate_init() if channel type changed
* remove channel flags check
* activate HT IBSS feature support
* slightly reword commit message
* rebase on wireless-testing

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-12-06 16:05:25 -05:00
Ben Greear 32dfefac19 mac80211: Make __check_htcap_disable static.
Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-11-28 14:43:59 -05:00
John W. Linville 515db09338 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux
Conflicts:
	drivers/net/wireless/iwlegacy/iwl-debugfs.c
	drivers/net/wireless/iwlegacy/iwl-rx.c
	drivers/net/wireless/iwlegacy/iwl-scan.c
	drivers/net/wireless/iwlegacy/iwl-tx.c
	include/net/bluetooth/bluetooth.h
2011-11-22 14:05:46 -05:00
Ben Greear ef96a84202 mac80211: Support ht-cap over-rides.
This implements ht-cap over-rides for mac80211 drivers.
HT may be disabled, making an /a/b/g/n station act like an
a/b/g station.  HT40 may be disabled forcing the station to
be HT20 even if the AP and local hardware support HT40.

MAX-AMSDU may be disabled.
AMPDU-Density may be increased.
AMPDU-Factor may be decreased.

This has been successfully tested with ath9k using patched
wpa_supplicant and iw.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-11-21 16:22:06 -05:00
Thomas Pedersen ae2772b313 mac80211: allow frame aggregation for mesh
Signed-off-by: Thomas Pedersen <thomas@cozybit.com>
Signed-off-by: Ashok Nagarajan <anagar6@uic.edu>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-11-08 15:55:27 -05:00
Paul Gortmaker bc3b2d7fb9 net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules
These files are non modular, but need to export symbols using
the macros now living in export.h -- call out the include so
that things won't break when we remove the implicit presence
of module.h from everywhere.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:30:30 -04:00