qcacmn: Unmap before changing skb data

In cases like Tx capture or per packet info, need to unmap
before skb is touched. Add wrapper function to do the same.

Change-Id: I0d13b2d90c80972f346f85960b1297511771516b

dp/wifi3.0/dp_tx.c

@@ -102,6 +102,36 @@ dp_update_tx_desc_stats(struct dp_pdev *pdev)
 }
 #endif /* CONFIG_WLAN_SYSFS_MEM_STATS */
 
+#if defined(WLAN_TX_PKT_CAPTURE_ENH) || defined(FEATURE_PERPKT_INFO)
+static inline
+void dp_tx_enh_unmap(struct dp_soc *soc, struct dp_tx_desc_s *desc)
+{
+	qdf_nbuf_unmap_nbytes_single(soc->osdev, desc->nbuf,
+				     QDF_DMA_TO_DEVICE,
+				     desc->nbuf->len);
+	desc->flags |= DP_TX_DESC_FLAG_UNMAP_DONE;
+}
+
+static inline void dp_tx_unmap(struct dp_soc *soc, struct dp_tx_desc_s *desc)
+{
+	if (qdf_likely(!(desc->flags & DP_TX_DESC_FLAG_UNMAP_DONE)))
+		qdf_nbuf_unmap_nbytes_single(soc->osdev, desc->nbuf,
+					     QDF_DMA_TO_DEVICE,
+					     desc->nbuf->len);
+}
+#else
+static inline
+void dp_tx_enh_unmap(struct dp_soc *soc, struct dp_tx_desc_s *desc)
+{
+}
+
+static inline void dp_tx_unmap(struct dp_soc *soc, struct dp_tx_desc_s *desc)
+{
+	qdf_nbuf_unmap_nbytes_single(soc->osdev, desc->nbuf,
+				     QDF_DMA_TO_DEVICE, desc->nbuf->len);
+}
+#endif
+
 #ifdef QCA_TX_LIMIT_CHECK
 /**
  * dp_tx_limit_check - Check if allocated tx descriptors reached
@@ -2118,8 +2148,7 @@ static inline void dp_tx_comp_free_buf(struct dp_soc *soc,
 	if ((desc->flags & DP_TX_DESC_FLAG_ME) && qdf_nbuf_is_cloned(nbuf))
 		goto nbuf_free;
 
-	qdf_nbuf_unmap_nbytes_single(soc->osdev, nbuf,
-				     QDF_DMA_TO_DEVICE, nbuf->len);
+	dp_tx_unmap(soc, desc);
 
 	if (desc->flags & DP_TX_DESC_FLAG_MESH_MODE)
 		return dp_mesh_tx_comp_free_buff(soc, desc);
@@ -3914,6 +3943,8 @@ dp_tx_comp_process_desc(struct dp_soc *soc,
 	dp_send_completion_to_pkt_capture(soc, desc, ts);
 
 	if (!(desc->msdu_ext_desc)) {
+		dp_tx_enh_unmap(soc, desc);
+
 		if (QDF_STATUS_SUCCESS ==
 		    dp_tx_add_to_comp_queue(soc, desc, ts, peer)) {
 			return;
@@ -3925,9 +3956,6 @@ dp_tx_comp_process_desc(struct dp_soc *soc,
 							   peer, ts,
 							   desc->nbuf,
 							   time_latency)) {
-			qdf_nbuf_unmap_nbytes_single(soc->osdev, desc->nbuf,
-						     QDF_DMA_TO_DEVICE,
-						     desc->nbuf->len);
 			dp_send_completion_to_stack(soc,
 						    desc->pdev,
 						    ts->peer_id,

dp/wifi3.0/dp_tx.h

@@ -45,6 +45,7 @@
 #define DP_TX_DESC_FLAG_TDLS_FRAME	0x100
 #define DP_TX_DESC_FLAG_ALLOCATED	0x200
 #define DP_TX_DESC_FLAG_MESH_MODE	0x400
+#define DP_TX_DESC_FLAG_UNMAP_DONE	0x800
 
 #define DP_TX_EXT_DESC_FLAG_METADATA_VALID 0x1