iwlwifi: mvm: support dqa queue sharing

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: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
index 3775e26..6092af2 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
@@ -687,6 +687,10 @@ struct iwl_mvm_baid_data {
  *	This is the state of a queue that has been fully configured (including
  *	SCD pointers, etc), has a specific RA/TID assigned to it, and can be
  *	used to send traffic.
+ * @IWL_MVM_QUEUE_SHARED: queue is shared, or in a process of becoming shared
+ *	This is a state in which a single queue serves more than one TID, all of
+ *	which are not aggregated. Note that the queue is only associated to one
+ *	RA.
  * @IWL_MVM_QUEUE_INACTIVE: queue is allocated but no traffic on it
  *	This is a state of a queue that has had traffic on it, but during the
  *	last %IWL_MVM_DQA_QUEUE_TIMEOUT time period there has been no traffic on
@@ -698,6 +702,7 @@ enum iwl_mvm_queue_status {
 	IWL_MVM_QUEUE_FREE,
 	IWL_MVM_QUEUE_RESERVED,
 	IWL_MVM_QUEUE_READY,
+	IWL_MVM_QUEUE_SHARED,
 	IWL_MVM_QUEUE_INACTIVE,
 };
 
@@ -760,6 +765,7 @@ struct iwl_mvm {
 		u8 hw_queue_refcount;
 		u8 ra_sta_id; /* The RA this queue is mapped to, if exists */
 		bool reserved; /* Is this the TXQ reserved for a STA */
+		u8 mac80211_ac; /* The mac80211 AC this queue is mapped to */
 		u16 tid_bitmap; /* Bitmap of the TIDs mapped to this queue */
 		/* Timestamp for inactivation per TID of this queue */
 		unsigned long last_frame_time[IWL_MAX_TID_COUNT + 1];