qcacmn: Add cdp api for dp tx desc availability

Add cdp api to check if tx desc pool available descriptor
threshold has reached.

Change-Id: Ie542d03dd865d32aa6e01da00328aa51728b4276
CRs-Fixed: 2369218

dp/inc/cdp_txrx_flow_ctrl_v2.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2017 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2016-2018 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -107,4 +107,28 @@ cdp_dump_flow_pool_info(struct cdp_soc_t *soc)
 
 	soc->ops->flowctl_ops->dump_flow_pool_info(dp_soc);
 }
+
+/**
+ * cdp_tx_desc_thresh_reached() - Check if avail tx desc meet threshold
+ * @soc - data path soc handle
+ * @vdev - dp vdev handle
+ *
+ * Return: true if threshold is met, false if not
+ */
+static inline bool
+cdp_tx_desc_thresh_reached(struct cdp_soc_t *soc, struct cdp_vdev *vdev)
+{
+	if (!soc || !soc->ops) {
+		QDF_TRACE(QDF_MODULE_ID_DP, QDF_TRACE_LEVEL_DEBUG,
+			  "%s invalid instance", __func__);
+		QDF_BUG(0);
+		return false;
+	}
+
+	if (!soc->ops->flowctl_ops ||
+	    !soc->ops->flowctl_ops->tx_desc_thresh_reached)
+		return false;
+
+	return soc->ops->flowctl_ops->tx_desc_thresh_reached(vdev);
+}
 #endif /* _CDP_TXRX_FC_V2_H_ */

dp/inc/cdp_txrx_ops.h

@@ -1078,6 +1078,8 @@ struct cdp_flowctl_ops {
 	void (*set_desc_global_pool_size)(uint32_t num_msdu_desc);
 
 	void (*dump_flow_pool_info)(void *);
+
+	bool (*tx_desc_thresh_reached)(struct cdp_vdev *vdev);
 };
 
 /**

dp/wifi3.0/dp_main.c

@@ -9166,6 +9166,7 @@ static struct cdp_flowctl_ops dp_ops_flowctl = {
 	.flow_pool_unmap_handler = dp_tx_flow_pool_unmap,
 	.register_pause_cb = dp_txrx_register_pause_cb,
 	.dump_flow_pool_info = dp_tx_dump_flow_pool_info,
+	.tx_desc_thresh_reached = dp_tx_desc_thresh_reached,
 #endif /* QCA_LL_TX_FLOW_CONTROL_V2 */
 };
 

dp/wifi3.0/dp_tx_desc.h

@@ -374,6 +374,16 @@ dp_tx_desc_free(struct dp_soc *soc, struct dp_tx_desc_s *tx_desc,
 	qdf_spin_unlock_bh(&pool->flow_pool_lock);
 }
 #else /* QCA_AC_BASED_FLOW_CONTROL */
+
+static inline bool
+dp_tx_is_threshold_reached(struct dp_tx_desc_pool_s *pool, uint16_t avail_desc)
+{
+	if (qdf_unlikely(avail_desc < pool->stop_th))
+		return true;
+	else
+		return false;
+}
+
 /**
  * dp_tx_desc_alloc() - Allocate a Software Tx Descriptor from given pool
  *
@@ -482,6 +492,21 @@ out:
 }
 
 #endif /* QCA_AC_BASED_FLOW_CONTROL */
+
+static inline bool
+dp_tx_desc_thresh_reached(struct cdp_vdev *vdev)
+{
+	struct dp_vdev *dp_vdev = (struct dp_vdev *)vdev;
+	struct dp_tx_desc_pool_s *pool;
+
+	if (!vdev)
+		return false;
+
+	pool = dp_vdev->pool;
+
+	return  dp_tx_is_threshold_reached(pool, pool->avail_desc);
+}
+
 #else /* QCA_LL_TX_FLOW_CONTROL_V2 */
 
 static inline void dp_tx_flow_control_init(struct dp_soc *handle)