qcacmn: Add Tx desc limit check for exception packets

Soc level exception descriptors limit is sent from FW in WMI service
ready TLV. Using that to check for exception packets limit

Change-Id: I99d20ecbb6a5bfd61b5a8a205775d34749eae880

dp/wifi3.0/dp_tx.c

@@ -102,6 +102,30 @@ dp_tx_limit_check(struct dp_vdev *vdev)
 	return false;
 }
 
+/**
+ * dp_tx_exception_limit_check - Check if allocated tx exception descriptors
+ * reached soc max limit
+ * @vdev: DP vdev handle
+ *
+ * Return: true if allocated tx descriptors reached max configured value, else
+ * false
+ */
+static inline bool
+dp_tx_exception_limit_check(struct dp_vdev *vdev)
+{
+	struct dp_pdev *pdev = vdev->pdev;
+	struct dp_soc *soc = pdev->soc;
+
+	if (qdf_atomic_read(&soc->num_tx_exception) >=
+			soc->num_msdu_exception_desc) {
+		dp_info("exc packets are more than max drop the exc pkt");
+		DP_STATS_INC(vdev, tx_i.dropped.exc_desc_na.num, 1);
+		return true;
+	}
+
+	return false;
+}
+
 /**
  * dp_tx_outstanding_inc - Increment outstanding tx desc values on pdev and soc
  * @vdev: DP pdev handle
@@ -139,6 +163,12 @@ dp_tx_limit_check(struct dp_vdev *vdev)
 	return false;
 }
 
+static inline bool
+dp_tx_exception_limit_check(struct dp_vdev *vdev)
+{
+	return false;
+}
+
 static inline void
 dp_tx_outstanding_inc(struct dp_pdev *pdev)
 {
@@ -274,7 +304,7 @@ dp_tx_desc_release(struct dp_tx_desc_s *tx_desc, uint8_t desc_pool_id)
 		dp_tx_me_free_buf(tx_desc->pdev, tx_desc->me_buffer);
 
 	if (tx_desc->flags & DP_TX_DESC_FLAG_TO_FW)
-		qdf_atomic_dec(&pdev->num_tx_exception);
+		qdf_atomic_dec(&soc->num_tx_exception);
 
 	if (HAL_TX_COMP_RELEASE_SOURCE_TQM ==
 				hal_tx_comp_get_buffer_source(&tx_desc->comp))
@@ -681,7 +711,7 @@ struct dp_tx_ext_desc_elem_s *dp_tx_prepare_ext_desc(struct dp_vdev *vdev,
 		qdf_mem_copy(&cached_ext_desc[HAL_TX_EXTENSION_DESC_LEN_BYTES],
 				&msdu_info->meta_data[0],
 				sizeof(struct htt_tx_msdu_desc_ext2_t));
-		qdf_atomic_inc(&vdev->pdev->num_tx_exception);
+		qdf_atomic_inc(&soc->num_tx_exception);
 	}
 
 	switch (msdu_info->frm_type) {
@@ -872,7 +902,7 @@ struct dp_tx_desc_s *dp_tx_prepare_desc_single(struct dp_vdev *vdev,
 	{
 		/* Temporary WAR due to TQM VP issues */
 		tx_desc->flags |= DP_TX_DESC_FLAG_TO_FW;
-		qdf_atomic_inc(&pdev->num_tx_exception);
+		qdf_atomic_inc(&soc->num_tx_exception);
 	}
 
 	return tx_desc;
@@ -942,7 +972,7 @@ static struct dp_tx_desc_s *dp_tx_prepare_desc(struct dp_vdev *vdev,
 #if TQM_BYPASS_WAR
 	/* Temporary WAR due to TQM VP issues */
 	tx_desc->flags |= DP_TX_DESC_FLAG_TO_FW;
-	qdf_atomic_inc(&pdev->num_tx_exception);
+	qdf_atomic_inc(&soc->num_tx_exception);
 #endif
 	if (qdf_unlikely(msdu_info->exception_fw))
 		tx_desc->flags |= DP_TX_DESC_FLAG_TO_FW;
@@ -2212,6 +2242,12 @@ dp_tx_send_exception(struct cdp_soc_t *soc, uint8_t vdev_id, qdf_nbuf_t nbuf,
 	 */
 	dp_tx_get_queue(vdev, nbuf, &msdu_info.tx_queue);
 
+	/*
+	 * Check exception descriptors
+	 */
+	if (dp_tx_exception_limit_check(vdev))
+		goto fail;
+
 	/*  Single linear frame */
 	/*
 	 * If nbuf is a simple linear frame, use send_single function to
@@ -4211,7 +4247,6 @@ QDF_STATUS dp_tx_pdev_init(struct dp_pdev *pdev)
 	struct dp_soc *soc = pdev->soc;
 
 	/* Initialize Flow control counters */
-	qdf_atomic_init(&pdev->num_tx_exception);
 	qdf_atomic_init(&pdev->num_tx_outstanding);
 
 	if (wlan_cfg_per_pdev_tx_ring(soc->wlan_cfg_ctx)) {