iwlagn: move the disable agg logic to transport layer

Since all the check_empty logic is now in the transport layer,
the upper layer doesn't need to know anything about tx queues.
The disable aggregation flow was the last to know what a tx queue
is, so move it too.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 74 insertions, 14 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-tx-pcie.c b/drivers/net/wireless/iwlwifi/iwl-trans-tx-pcie.c
index da8d79eb4dc5..aa44b9242d07 100644
--- a/drivers/net/wireless/iwlwifi/iwl-trans-tx-pcie.c
+++ b/drivers/net/wireless/iwlwifi/iwl-trans-tx-pcie.c
@@ -560,32 +560,92 @@ int iwl_trans_pcie_tx_agg_alloc(struct iwl_trans *trans,
 
 	return 0;
 }
-int iwl_trans_pcie_txq_agg_disable(struct iwl_priv *priv, u16 txq_id)
+
+void iwl_trans_pcie_txq_agg_disable(struct iwl_trans *trans, int txq_id)
 {
-	struct iwl_trans *trans = trans(priv);
+	iwlagn_tx_queue_stop_scheduler(trans, txq_id);
+
+	iwl_clear_bits_prph(bus(trans), SCD_AGGR_SEL, (1 << txq_id));
+
+	priv(trans)->txq[txq_id].q.read_ptr = 0;
+	priv(trans)->txq[txq_id].q.write_ptr = 0;
+	/* supposes that ssn_idx is valid (!= 0xFFF) */
+	iwl_trans_set_wr_ptrs(trans, txq_id, 0);
+
+	iwl_clear_bits_prph(bus(trans), SCD_INTERRUPT_MASK, (1 << txq_id));
+	iwl_txq_ctx_deactivate(priv(trans), txq_id);
+	iwl_trans_tx_queue_set_status(priv(trans),
+					&priv(trans)->txq[txq_id], 0, 0);
+}
+
+int iwl_trans_pcie_tx_agg_disable(struct iwl_trans *trans,
+				  enum iwl_rxon_context_id ctx, int sta_id,
+				  int tid)
+{
+	unsigned long flags;
+	int read_ptr, write_ptr;
+	struct iwl_tid_data *tid_data;
+	int txq_id;
+
+	spin_lock_irqsave(&trans->shrd->sta_lock, flags);
+
+	tid_data = &trans->shrd->tid_data[sta_id][tid];
+	txq_id = tid_data->agg.txq_id;
+
 	if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) ||
 	    (IWLAGN_FIRST_AMPDU_QUEUE +
-		hw_params(priv).num_ampdu_queues <= txq_id)) {
-		IWL_ERR(priv,
+		hw_params(trans).num_ampdu_queues <= txq_id)) {
+		IWL_ERR(trans,
 			"queue number out of range: %d, must be %d to %d\n",
 			txq_id, IWLAGN_FIRST_AMPDU_QUEUE,
 			IWLAGN_FIRST_AMPDU_QUEUE +
-			hw_params(priv).num_ampdu_queues - 1);
+			hw_params(trans).num_ampdu_queues - 1);
+		spin_unlock_irqrestore(&trans->shrd->sta_lock, flags);
 		return -EINVAL;
 	}
 
-	iwlagn_tx_queue_stop_scheduler(trans, txq_id);
+	switch (trans->shrd->tid_data[sta_id][tid].agg.state) {
+	case IWL_EMPTYING_HW_QUEUE_ADDBA:
+		/*
+		* This can happen if the peer stops aggregation
+		* again before we've had a chance to drain the
+		* queue we selected previously, i.e. before the
+		* session was really started completely.
+		*/
+		IWL_DEBUG_HT(trans, "AGG stop before setup done\n");
+		goto turn_off;
+	case IWL_AGG_ON:
+		break;
+	default:
+		IWL_WARN(trans, "Stopping AGG while state not ON"
+				"or starting\n");
+	}
 
-	iwl_clear_bits_prph(bus(priv), SCD_AGGR_SEL, (1 << txq_id));
+	write_ptr = priv(trans)->txq[txq_id].q.write_ptr;
+	read_ptr = priv(trans)->txq[txq_id].q.read_ptr;
 
-	priv->txq[txq_id].q.read_ptr = 0;
-	priv->txq[txq_id].q.write_ptr = 0;
-	/* supposes that ssn_idx is valid (!= 0xFFF) */
-	iwl_trans_set_wr_ptrs(trans, txq_id, 0);
+	/* The queue is not empty */
+	if (write_ptr != read_ptr) {
+		IWL_DEBUG_HT(trans, "Stopping a non empty AGG HW QUEUE\n");
+		trans->shrd->tid_data[sta_id][tid].agg.state =
+			IWL_EMPTYING_HW_QUEUE_DELBA;
+		spin_unlock_irqrestore(&trans->shrd->sta_lock, flags);
+		return 0;
+	}
+
+	IWL_DEBUG_HT(trans, "HW queue is empty\n");
+turn_off:
+	trans->shrd->tid_data[sta_id][tid].agg.state = IWL_AGG_OFF;
+
+	/* do not restore/save irqs */
+	spin_unlock(&trans->shrd->sta_lock);
+	spin_lock(&trans->shrd->lock);
+
+	iwl_trans_pcie_txq_agg_disable(trans, txq_id);
+
+	spin_unlock_irqrestore(&trans->shrd->lock, flags);
 
-	iwl_clear_bits_prph(bus(priv), SCD_INTERRUPT_MASK, (1 << txq_id));
-	iwl_txq_ctx_deactivate(priv, txq_id);
-	iwl_trans_tx_queue_set_status(priv, &priv->txq[txq_id], 0, 0);
+	iwl_stop_tx_ba_trans_ready(priv(trans), ctx, sta_id, tid);
 
 	return 0;
 }