Currently multicast queue is associated with the broadcast
station.

This raises quite a few issues:

The multicast queue has a special treatment:
- It is sent in the MAC context command
- It is excluded from tfd_queue_mask

In DQA mode we end up enabling two queues - the probe response
queue and the multicast queue - with the same station (broadcast)
and TID while in DQA mode it should be unique RA-TID.
Firmware will enforce it for a000 devices, so this allocation
will fail.

In addition, in a000 devices the FW will set the FIFO and not
the driver. So there is a need for FW to know when we enable
the queue that it is multicast queue so it will be bound to
the multicast FIFO. There is no such way in current design.

In order to simplify driver and firmware handling of this queue
create a multicast station.
This solves the unique RA-TID issue in the short term and serves
as preparation for the long term.

In the long term we will also add a flag marking this station for
the FW as the multicast station.
Once we will do that the FW will know this is the multicast queue
immediately when it is added and bind it to the correct FIFO.
It will also enable removing the special treatment of the
queue in the MAC context command.
Signed-off-by: NSara Sharon <sara.sharon@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

When a station is asleep, the fw will set it as "asleep".
All queues that are used only by one station will be stopped by
the fw.

In pre-DQA mode this was relevant for aggregation queues. However,
in DQA mode a queue is owned by one station only, so all queues
will be stopped.
As a result, we don't expect to get filtered frames back to
mac80211 and don't have to maintain the entire pending_frames
state logic, the same way as we do in aggregations.

The correct behavior is to align DQA behavior with the aggregation
queue behaviour pre-DQA:
- Don't count pending frames.
- Let mac80211 know we have frames in these queues so that it can
properly handle trigger frames.

When a trigger frame is received, mac80211 tells the driver to send
frames from the queues using release_buffered_frames.
The driver will tell the fw to let frames out even if the station
is asleep. This is done by iwl_mvm_sta_modify_sleep_tx_count.
Signed-off-by: NSara Sharon <sara.sharon@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

When removing an IGTK, iwl_mvm_send_sta_igtk() was
called before station ID was retrieved, so the function
was invoked with an invalid station ID. Fix this by first
getting the station ID.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=192411Signed-off-by: NIlan Peer <ilan.peer@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

In DQA mode the check whether to decrement the pending frames
counter relies on the tid status and not on the txq id.
This may result in an inconsistent state of the pending frames
counter in case frame is queued on a non aggregation queue but
with this TID, and will be followed by a failure to remove the
station and later on SYSASSERT 0x3421 when trying to remove the
MAC.
Such frames are for example bar and qos NDPs.
Fix it by aligning the condition of incrementing the counter
with the condition of decrementing it - rely on TID state for
DQA mode.
Also, avoid internal error like this affecting station removal
for DQA mode - since we can know for sure it is an internal
error.

Fixes: cf961e16 ("iwlwifi: mvm: support dqa-mode agg on non-shared queue")
Signed-off-by: NSara Sharon <sara.sharon@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

A few of the static queues are enabled along with the bcast
STA. Make sure they are removed along with it, rather than
waiting for the mac ctxt release.

This is needed because we sometimes have a STA being removed
and then added again (either with the same sta_id or a
different one). If we wait for the mac ctxt release we will
try to allocate the queues again (as this is currently done
in the STA allocation and not in the MAC init) although
they weren't freed, and even if the sta_id of the STA has
changed.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

The firmware will soon actually look at the AID field, and
when it does that it'll try to ensure that the AID is never
changing. Due to the way the station is added, it may start
with an invalid AID before it's associated, so to ensure a
constant AID (once it becomes non-zero), track the station
state and set the AID only when the station is associated
and when it disassociates.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

If iwl_mvm_find_free_queue() doesn't find a free queue, it will
return an inactive one.
However, not all the call paths free this queue before reassigning
it, which is a bug.
Check it in other paths and act accordingly.

Fixes: 9794c64f ("iwlwifi: mvm: support dqa queue inactivation upon timeout")
Signed-off-by: NSara Sharon <sara.sharon@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

When removing inactive queue - use the central disable queue
function. This is needed due to a000 changes to come, but is
a proper cleanup anyway.
Signed-off-by: NSara Sharon <sara.sharon@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Remove the sta_id variable, to avoid this compile warning when
compiling with W=1:

/home/luca/iwlwifi/stack-dev/drivers/net/wireless/intel/iwlwifi/mvm/sta.c: In function ‘iwl_mvm_change_queue_owner’:
/home/luca/iwlwifi/stack-dev/drivers/net/wireless/intel/iwlwifi/mvm/sta.c:871:5: warning: variable ‘sta_id’ set but not used [-Wunused-but-set-variable]
  s8 sta_id;
     ^
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

When the firmware restarts in a situation in which any station
has no queue reserved anymore because that queue was used, the
code will crash trying to access the queue_info array at the
offset 255, which is far too big. Fix this by checking that a
queue is actually reserved before writing its status.

Fixes: 8d98ae6e ("iwlwifi: mvm: re-assign old queues after hw restart in dqa mode")
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

When a peer associates, the firmware will soon want to know
its AID to be able to compute the TIM IE by itself.
In DQA, the firmware has all the information it needs to
update the TIM internally. The only missing part is the
AID.
Signed-off-by: NEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

When using RSS on 9000 series devices, we can't rely on processing the
received frames for station powersave handling, since they could be
processed on different CPUs and out of order.

In order to still manage the powersave of stations, the firmware sends
a notification on sleep->wake, wake->sleep and - for U-APSD - frames
received with PM while already sleeping (with the TID.)

With this, the driver can set AP_LINK_PS, which is required for real
parallel RX. In addition, this requires checking for PS-Poll frames
and calling ieee80211_sta_pspoll() appropriately.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

When a STA has deferred traffic to TX, an appropriate bit
is turned on in %deferred_tx_frames to indicate deferred
traffic. This marking is never turned off, resulting in
iterating over TIDs with no deferred traffic.

Although this didn't cause any failures/errors/bugs, there
is still no point of iterating over these TIDs when not
needed.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

If a TXQ's marking as a reserved queue is removed,
when removing the STA the driver might try to access
out of bounds memory. Make sure the reserved queue
is freed only if it is still reserved.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

When a TXQ's owner is changed, the FW is indeed notified, but
the driver doesn't update the current metadata to reflect the
owner change. Fix that.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

When we unshare a queue, the ADD_STA was not properly
initialised.
Signed-off-by: NEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

There's no point in making this an out-of-line function
since it just calls a single other function with a few
changed parameters.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Variable "ac" defined twice. Fix that.

Fixes: commit 93f436e2 ("iwlwifi: mvm: set sta_id in SCD_QUEUE_CONFIG cmd")
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Use setup_timer function instead of initializing timer with the function
and data fields
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: NEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

When a STA is removed in DQA mode, if no traffic went through
its reserved queue, the txq continues to be marked as
reserved and no STA can use it.

Make sure that in such a case the reserved queue is marked
as free when the STA is removed.

Fixes: commit 24afba76 ("iwlwifi: mvm: support bss dynamic alloc/dealloc of queues")
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Since the SCD_QUEUE_CFG command was introduced the driver
calls iwl_trans_txq_enable_cfg() with a NULL for scd_cfg
parameter.
This makes the transport avoid writing to the SCD pointers,
since it can cause races with firmware, which is also accessing
the registers.
The transport only updates the write pointer in that case.
Fix a wrong call to iwl_trans_txq_enable() which caused a
scd_cfg parameter to be sent to transport, resulting with an
access to SCD registers.

Fixes: 58f2cc57 ("iwlwifi: mvm: support dqa-mode scd queue redirection")
Signed-off-by: NSara Sharon <sara.sharon@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Every active TXQ is assigned to a TID given through the
SCD_CONFIG_CMD, and acts as an identifier in the FW. However,
there may be cases this ownership needs to be changed.

For example, in the following scenario:
 1. TID x is owner of a queue
 2. Due to a shortage of queues, TID y and z share with x
 3. TID x becomes inactive and needs to be removed from the
    shared queue.
In this scenario, if another queue is freed and traffic on x
continues, we can't allocate it a new queue as long as it is
the owner of the first queue.

Support moving ownership of a TXQ to a different TID (same
STA) without stopping the queue.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Due to the addition of another option in the SCD_CONFIG_CMD's
%enable field, change the assignment of this field to use
defines rather than hard-code the value itself.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

When working in DQA mode, if a queue is shared and a HW restart
occurs, there might be a possible race condition between
stations on the queues, and an existing queue might be left
with no queues.

To solve this, make sure in DQA mode to re-assign the same
queues as before the HW restart.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

When sending the SCD_QUEUE_CONFIG command, the queue is
associated to a specific TID. If later there is a need to
use this TID on a different queue instead, it first needs to
be unassociated from the first queue.

Keep track for every queue what TID is associated with it.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

When a shared queue becomes unshared, aggregations should be
re-enabled if they've existed before. Make sure that they do
this, if required.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Add support for installing and removing GMAC key
for newer FW versions that support GCM and MFP.
GMAC provides authentication and integrity for multicast management
frames.

Firmware API was changed, update the driver accordingly.
Signed-off-by: NAyala Beker <ayala.beker@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Restart flow zeroes the rx_ba_sessions counter. Mac80211 asks
driver to tear down of the session only afterwards, and as a
result driver didn't free the data. Fix it.
Signed-off-by: NSara Sharon <sara.sharon@intel.com>
Fixes: 10b2b201 ("iwlwifi: mvm: add infrastructure for tracking BA session in driver")
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Add some prints to track BAID assignment.
Signed-off-by: NSara Sharon <sara.sharon@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Make sure that in DQA mode, the SCD's configuration of a
queue is redirected to the lower AC of the streams of the
queue.

Make sure that this queue is redirected to the lowest AC
when adding a new RA/TID to an existing queue. If it isn't -
redirect the queue.

Also, as redirection revealed a bug in the marking of a
shared queue, this patch contains a small fix to make
sure a shared queue maintains the appropriate "shared queue
marking".
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Support TDLS when working in DQA mode.

This is done mainly by NOT doing any special things
for TDLS, as the queues are dynamically created anyway,
so no need to allocate them ahead of time.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Newer hardware supports GCMP and GCMP 256-bit ciphers.
Add support for adding/setting GCMP key for TX mode.

In the TX command handling GCMP-256 is handled in a different
way as the key size should be up to 128-bits:
Set the key value to the key index in the key table,
and specify that this key should be taken form the key table
instead of from the TX command.

While at it - convert security control flags to an enum.
Signed-off-by: NAyala Beker <ayala.beker@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

In DQA mode the AUX queue is mapped elsewhere than in non-
DQA mode. Update the code to reflect this.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Set the correct sta_id in the SCD_QUEUE_CONFIG command sent
to the FW when enabling/disabling queues. This is needed in
DQA-mode to allow the FW to associate between queue and STA.

In case the queue isn't connected to a specific station but
rather is a static "generic" queue - the sta_id should be
set to 0x10 (max supported STA is 0x0f).
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Support DQA queue sharing when no free queue exists for
allocation to a STA that already exists. This means that
a single queue will serve more than a single TID (although
the RA will be the same for all TIDs served).

We try to choose the lowest AC possible, to ensure the
shared queues have the lowest possible combined AC
requirements. The queue to share is chosen only from the
same RA's DATA queues as follows (in descending priority):
 1. An AC_BE queue
 2. Same AC queue
 3. Highest AC queue that is lower than new AC
 4. Any existing AC (there always is at least 1 DATA queue)

If any aggregations existed for any of the TIDs of the
shared queue - they are stopped (the FW is notified), but
no delBA is sent.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Support marking queues as inactive upon a timeout expiring,
and allow inactive queues to be re-assigned to other RA/TIDs
if no other queue is free.

This is done by keeping a timestamp of the latest frame TXed
for every RA/TID, and then going over the queues currently in
use when a new queue is needed, inactivating all those that
are inactive.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

Support queue removal in DQA mode in iwl_mvm_rm_sta() also when
the device isn't a STA connected to an AP.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

The FW expect the driver to set the encryption algorithm type when
installing the IGTK key in the HW.
Currently when installing CMAC IGTK key we don't set the algorithm type
and as a result the FW fails to calculate the MIC of multicast management
frames.
Fix it.
Signed-off-by: NAyala Beker <ayala.beker@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

The commit below mistakenly changed an rcu_dereference_check
to a rcu_dereference_protected which introduced the
following RCU warning:

[ INFO: suspicious RCU usage. ]
 4.6.0-rc7-next-20160513-dbg-00004-g8de8b92-dirty #655 Not tainted
 -------------------------------
 drivers/net/wireless/intel/iwlwifi/mvm/mvm.h:1069 suspicious rcu_dereference_protected() usage!
 Call Trace:
  [<ffffffff8106b836>] lockdep_rcu_suspicious+0xf7/0x100
  [<ffffffffa03b2321>] iwl_mvm_get_key_sta.part.0+0x5d/0x80 [iwlmvm]
  [<ffffffffa03b4acb>] iwl_mvm_update_tkip_key+0xd3/0x162 [iwlmvm]
  [<ffffffffa03a2b60>] iwl_mvm_mac_update_tkip_key+0x17/0x19 [iwlmvm]
  [<ffffffffa0329646>] ieee80211_tkip_decrypt_data+0x22c/0x24b [mac80211]
  [<ffffffffa0318bb1>] ieee80211_crypto_tkip_decrypt+0xc5/0x110 [mac80211]
  [<ffffffffa033102e>] ieee80211_rx_handlers+0x9bb/0x1fe1 [mac80211]

Fixes: 13303c0f ("iwlwifi: mvm: use helpers to get iwl_mvm_sta")
Reported-by: NSergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: NEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>

In non-shared queues, DQA requires re-configuring existing
queues to become aggregated rather than allocating a new
one. It also requires "un-aggregating" an existing queue
when aggregations are turned off.

Support this requirement for non-shared queues.
Signed-off-by: NLiad Kaufman <liad.kaufman@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>