qcacmn: Add a change to do fast transmit completion

Lot of checks in Tx completion path are for special handlings
such as when ol stats are enabled some protective debug checks etc..
Add a logic to fast free of buffer at transmit completion.
If extended stats not enabled(Typically needed for enterprise cases)
do the buffer free faster. This is controlled through a flag.

Change-Id: I04873b5e3643d8e93e5b248fcaf23504dcb7624f

dp/wifi3.0/dp_tx.c

@@ -262,6 +262,8 @@ dp_tx_desc_release(struct dp_tx_desc_s *tx_desc, uint8_t desc_pool_id)
 
 	soc = pdev->soc;
 
+	dp_tx_outstanding_dec(pdev);
+
 	if (tx_desc->frm_type == dp_tx_frm_tso)
 		dp_tx_tso_desc_release(soc, tx_desc);
 
@@ -271,8 +273,6 @@ dp_tx_desc_release(struct dp_tx_desc_s *tx_desc, uint8_t desc_pool_id)
 	if (tx_desc->flags & DP_TX_DESC_FLAG_ME)
 		dp_tx_me_free_buf(tx_desc->pdev, tx_desc->me_buffer);
 
-	dp_tx_outstanding_dec(pdev);
-
 	if (tx_desc->flags & DP_TX_DESC_FLAG_TO_FW)
 		qdf_atomic_dec(&pdev->num_tx_exception);
 
@@ -1114,10 +1114,8 @@ static QDF_STATUS dp_tx_hw_enqueue(struct dp_soc *soc, struct dp_vdev *vdev,
 					*tx_exc_metadata)
 {
 	uint8_t type;
-	uint16_t length;
 	void *hal_tx_desc;
 	uint32_t *hal_tx_desc_cached;
-	qdf_dma_addr_t dma_addr;
 
 	/*
 	 * Setting it initialization statically here to avoid
@@ -1144,19 +1142,20 @@ static QDF_STATUS dp_tx_hw_enqueue(struct dp_soc *soc, struct dp_vdev *vdev,
 	hal_tx_desc_cached = (void *) cached_desc;
 
 	if (tx_desc->flags & DP_TX_DESC_FLAG_FRAG) {
-		length = HAL_TX_EXT_DESC_WITH_META_DATA;
+		tx_desc->length = HAL_TX_EXT_DESC_WITH_META_DATA;
 		type = HAL_TX_BUF_TYPE_EXT_DESC;
-		dma_addr = tx_desc->msdu_ext_desc->paddr;
+		tx_desc->dma_addr = tx_desc->msdu_ext_desc->paddr;
 	} else {
-		length = qdf_nbuf_len(tx_desc->nbuf) - tx_desc->pkt_offset;
+		tx_desc->length = qdf_nbuf_len(tx_desc->nbuf) -
+					tx_desc->pkt_offset;
 		type = HAL_TX_BUF_TYPE_BUFFER;
-		dma_addr = qdf_nbuf_mapped_paddr_get(tx_desc->nbuf);
+		tx_desc->dma_addr = qdf_nbuf_mapped_paddr_get(tx_desc->nbuf);
 	}
 
-	qdf_assert_always(dma_addr);
+	qdf_assert_always(tx_desc->dma_addr);
 
 	hal_tx_desc_set_buf_addr(soc->hal_soc, hal_tx_desc_cached,
-				 dma_addr, bm_id, tx_desc->id,
+				 tx_desc->dma_addr, bm_id, tx_desc->id,
 				 type);
 	hal_tx_desc_set_lmac_id(soc->hal_soc, hal_tx_desc_cached,
 				vdev->lmac_id);
@@ -1173,7 +1172,7 @@ static QDF_STATUS dp_tx_hw_enqueue(struct dp_soc *soc, struct dp_vdev *vdev,
 				      (vdev->bss_ast_hash & 0xF));
 
 	hal_tx_desc_set_fw_metadata(hal_tx_desc_cached, fw_metadata);
-	hal_tx_desc_set_buf_length(hal_tx_desc_cached, length);
+	hal_tx_desc_set_buf_length(hal_tx_desc_cached, tx_desc->length);
 	hal_tx_desc_set_buf_offset(hal_tx_desc_cached, tx_desc->pkt_offset);
 	hal_tx_desc_set_encap_type(hal_tx_desc_cached, tx_desc->tx_encap_type);
 	hal_tx_desc_set_addr_search_flags(hal_tx_desc_cached,
@@ -1200,7 +1199,7 @@ static QDF_STATUS dp_tx_hw_enqueue(struct dp_soc *soc, struct dp_vdev *vdev,
 		tx_desc->timestamp = qdf_ktime_to_ms(qdf_ktime_get());
 
 	dp_verbose_debug("length:%d , type = %d, dma_addr %llx, offset %d desc id %u",
-			 length, type, (uint64_t)dma_addr,
+			 tx_desc->length, type, (uint64_t)tx_desc->dma_addr,
 			 tx_desc->pkt_offset, tx_desc->id);
 
 	hal_ring_hdl = dp_tx_get_hal_ring_hdl(soc, ring_id);
@@ -1227,7 +1226,7 @@ static QDF_STATUS dp_tx_hw_enqueue(struct dp_soc *soc, struct dp_vdev *vdev,
 	tx_desc->flags |= DP_TX_DESC_FLAG_QUEUED_TX;
 	dp_vdev_peer_stats_update_protocol_cnt_tx(vdev, tx_desc->nbuf);
 	hal_tx_desc_sync(hal_tx_desc_cached, hal_tx_desc);
-	DP_STATS_INC_PKT(vdev, tx_i.processed, 1, length);
+	DP_STATS_INC_PKT(vdev, tx_i.processed, 1, tx_desc->length);
 	status = QDF_STATUS_SUCCESS;
 
 ring_access_fail:
@@ -1703,6 +1702,9 @@ dp_tx_send_msdu_single(struct dp_vdev *vdev, qdf_nbuf_t nbuf,
 	if (msdu_info->exception_fw)
 		HTT_TX_TCL_METADATA_VALID_HTT_SET(htt_tcl_metadata, 1);
 
+	dp_tx_desc_update_fast_comp_flag(soc, tx_desc,
+					 !pdev->enhanced_stats_en);
+
 	if (qdf_unlikely(QDF_STATUS_SUCCESS !=
 			 dp_tx_msdu_single_map(vdev, tx_desc, nbuf))) {
 		/* Handle failure */
@@ -3458,13 +3460,49 @@ dp_tx_comp_process_desc_list(struct dp_soc *soc,
 {
 	struct dp_tx_desc_s *desc;
 	struct dp_tx_desc_s *next;
-	struct hal_tx_completion_status ts = {0};
+	struct hal_tx_completion_status ts;
 	struct dp_peer *peer;
 	qdf_nbuf_t netbuf;
 
 	desc = comp_head;
 
 	while (desc) {
+		if (qdf_likely(desc->flags & DP_TX_DESC_FLAG_SIMPLE)) {
+			struct dp_pdev *pdev = desc->pdev;
+
+			peer = dp_peer_find_by_id(soc, desc->peer_id);
+			if (qdf_likely(peer)) {
+				/*
+				 * Increment peer statistics
+				 * Minimal statistics update done here
+				 */
+				DP_STATS_INC_PKT(peer, tx.comp_pkt, 1,
+						 desc->length);
+
+				if (desc->tx_status !=
+						HAL_TX_TQM_RR_FRAME_ACKED)
+					peer->stats.tx.tx_failed++;
+
+				dp_peer_unref_del_find_by_id(peer);
+			}
+
+			qdf_assert(pdev);
+			dp_tx_outstanding_dec(pdev);
+
+			/*
+			 * Calling a QDF WRAPPER here is creating signifcant
+			 * performance impact so avoided the wrapper call here
+			 */
+			next = desc->next;
+			qdf_mem_unmap_nbytes_single(soc->osdev,
+						    desc->dma_addr,
+						    QDF_DMA_TO_DEVICE,
+						    desc->length);
+			qdf_nbuf_free(desc->nbuf);
+			dp_tx_desc_free(soc, desc, desc->pool_id);
+			desc = next;
+			continue;
+		}
 		hal_tx_comp_get_status(&desc->comp, &ts, soc->hal_soc);
 		peer = dp_peer_find_by_id(soc, ts.peer_id);
 		dp_tx_comp_process_tx_status(desc, &ts, peer, ring_id);
@@ -3511,12 +3549,35 @@ void dp_tx_process_htt_completion(struct dp_tx_desc_s *tx_desc, uint8_t *status,
 	struct cdp_tid_tx_stats *tid_stats = NULL;
 	struct htt_soc *htt_handle;
 
-	qdf_assert(tx_desc->pdev);
+	/*
+	 * If the descriptor is already freed in vdev_detach,
+	 * continue to next descriptor
+	 */
+	if (!tx_desc->vdev && !tx_desc->flags) {
+		QDF_TRACE(QDF_MODULE_ID_DP,
+			  QDF_TRACE_LEVEL_INFO,
+			  "Descriptor freed in vdev_detach %d",
+			  tx_desc->id);
+		return;
+	}
 
 	pdev = tx_desc->pdev;
-	vdev = tx_desc->vdev;
 	soc = pdev->soc;
 
+	if (qdf_unlikely(tx_desc->pdev->is_pdev_down)) {
+		QDF_TRACE(QDF_MODULE_ID_DP,
+			  QDF_TRACE_LEVEL_INFO,
+			  "pdev in down state %d",
+			  tx_desc->id);
+		dp_tx_comp_free_buf(soc, tx_desc);
+		dp_tx_desc_release(tx_desc, tx_desc->pool_id);
+		return;
+	}
+
+	qdf_assert(tx_desc->pdev);
+
+	vdev = tx_desc->vdev;
+
 	if (!vdev)
 		return;
 	tx_status = HTT_TX_WBM_COMPLETION_V2_TX_STATUS_GET(htt_desc[0]);
@@ -3648,8 +3709,9 @@ uint32_t dp_tx_comp_handler(struct dp_intr *int_ctx, struct dp_soc *soc,
 
 more_data:
 	/* Re-initialize local variables to be re-used */
-		head_desc = NULL;
-		tail_desc = NULL;
+	head_desc = NULL;
+	tail_desc = NULL;
+
 	if (qdf_unlikely(dp_srng_access_start(int_ctx, soc, hal_ring_hdl))) {
 		dp_err("HAL RING Access Failed -- %pK", hal_ring_hdl);
 		return 0;
@@ -3664,6 +3726,7 @@ more_data:
 
 	/* Find head descriptor from completion ring */
 	while (qdf_likely(num_avail_for_reap)) {
+
 		tx_comp_hal_desc =  dp_srng_dst_get_next(soc, hal_ring_hdl);
 		if (qdf_unlikely(!tx_comp_hal_desc))
 			break;
@@ -3672,8 +3735,10 @@ more_data:
 
 		/* If this buffer was not released by TQM or FW, then it is not
 		 * Tx completion indication, assert */
-		if ((buffer_src != HAL_TX_COMP_RELEASE_SOURCE_TQM) &&
-				(buffer_src != HAL_TX_COMP_RELEASE_SOURCE_FW)) {
+		if (qdf_unlikely(buffer_src !=
+					HAL_TX_COMP_RELEASE_SOURCE_TQM) &&
+				 (qdf_unlikely(buffer_src !=
+					HAL_TX_COMP_RELEASE_SOURCE_FW))) {
 			uint8_t wbm_internal_error;
 
 			dp_err_rl(
@@ -3725,35 +3790,6 @@ more_data:
 				(tx_desc_id & DP_TX_DESC_ID_OFFSET_MASK) >>
 				DP_TX_DESC_ID_OFFSET_OS);
 
-		/*
-		 * If the descriptor is already freed in vdev_detach,
-		 * continue to next descriptor
-		 */
-		if (!tx_desc->vdev && !tx_desc->flags) {
-			QDF_TRACE(QDF_MODULE_ID_DP,
-				  QDF_TRACE_LEVEL_INFO,
-				  "Descriptor freed in vdev_detach %d",
-				  tx_desc_id);
-
-			num_processed += !(count & DP_TX_NAPI_BUDGET_DIV_MASK);
-			count++;
-			continue;
-		}
-
-		if (qdf_unlikely(tx_desc->pdev->is_pdev_down)) {
-			QDF_TRACE(QDF_MODULE_ID_DP,
-				  QDF_TRACE_LEVEL_INFO,
-				  "pdev in down state %d",
-				  tx_desc_id);
-
-			num_processed += !(count & DP_TX_NAPI_BUDGET_DIV_MASK);
-			count++;
-
-			dp_tx_comp_free_buf(soc, tx_desc);
-			dp_tx_desc_release(tx_desc, tx_desc->pool_id);
-			continue;
-		}
-
 		/*
 		 * If the release source is FW, process the HTT status
 		 */
@@ -3765,6 +3801,43 @@ more_data:
 			dp_tx_process_htt_completion(tx_desc,
 					htt_tx_status, ring_id);
 		} else {
+			/*
+			 * If the fast completion mode is enabled extended
+			 * metadata from descriptor is not copied
+			 */
+			if (qdf_likely(tx_desc->flags &
+						DP_TX_DESC_FLAG_SIMPLE)) {
+				tx_desc->peer_id =
+					hal_tx_comp_get_peer_id(tx_comp_hal_desc);
+				tx_desc->tx_status =
+					hal_tx_comp_get_tx_status(tx_comp_hal_desc);
+				goto add_to_pool;
+			}
+
+			/*
+			 * If the descriptor is already freed in vdev_detach,
+			 * continue to next descriptor
+			 */
+			if (qdf_unlikely(!tx_desc->vdev) &&
+					 qdf_unlikely(!tx_desc->flags)) {
+				QDF_TRACE(QDF_MODULE_ID_DP,
+					  QDF_TRACE_LEVEL_INFO,
+					  "Descriptor freed in vdev_detach %d",
+					  tx_desc_id);
+				continue;
+			}
+
+			if (qdf_unlikely(tx_desc->pdev->is_pdev_down)) {
+				QDF_TRACE(QDF_MODULE_ID_DP,
+					  QDF_TRACE_LEVEL_INFO,
+					  "pdev in down state %d",
+					  tx_desc_id);
+
+				dp_tx_comp_free_buf(soc, tx_desc);
+				dp_tx_desc_release(tx_desc, tx_desc->pool_id);
+				goto next_desc;
+			}
+
 			/* Pool id is not matching. Error */
 			if (tx_desc->pool_id != pool_id) {
 				QDF_TRACE(QDF_MODULE_ID_DP,
@@ -3778,12 +3851,18 @@ more_data:
 			if (!(tx_desc->flags & DP_TX_DESC_FLAG_ALLOCATED) ||
 				!(tx_desc->flags & DP_TX_DESC_FLAG_QUEUED_TX)) {
 				QDF_TRACE(QDF_MODULE_ID_DP,
-					QDF_TRACE_LEVEL_FATAL,
-					"Txdesc invalid, flgs = %x,id = %d",
-					tx_desc->flags,	tx_desc_id);
+					  QDF_TRACE_LEVEL_FATAL,
+					  "Txdesc invalid, flgs = %x,id = %d",
+					  tx_desc->flags, tx_desc_id);
 				qdf_assert_always(0);
 			}
 
+			/* Collect hw completion contents */
+			hal_tx_comp_desc_sync(tx_comp_hal_desc,
+					      &tx_desc->comp, 1);
+add_to_pool:
+			DP_HIST_PACKET_COUNT_INC(tx_desc->pdev->pdev_id);
+
 			/* First ring descriptor on the cycle */
 			if (!head_desc) {
 				head_desc = tx_desc;
@@ -3793,15 +3872,8 @@ more_data:
 			tail_desc->next = tx_desc;
 			tx_desc->next = NULL;
 			tail_desc = tx_desc;
-
-			DP_HIST_PACKET_COUNT_INC(tx_desc->pdev->pdev_id);
-
-			/* Collect hw completion contents */
-			hal_tx_comp_desc_sync(tx_comp_hal_desc,
-					&tx_desc->comp, 1);
-
 		}
-
+next_desc:
 		num_processed += !(count & DP_TX_NAPI_BUDGET_DIV_MASK);
 
 		/*

dp/wifi3.0/dp_tx.h

@@ -25,7 +25,7 @@
 
 #define DP_TX_MAX_NUM_FRAGS 6
 
-#define DP_TX_DESC_FLAG_ALLOCATED	0x1
+#define DP_TX_DESC_FLAG_SIMPLE		0x1
 #define DP_TX_DESC_FLAG_TO_FW		0x2
 #define DP_TX_DESC_FLAG_FRAG		0x4
 #define DP_TX_DESC_FLAG_RAW		0x8
@@ -34,6 +34,7 @@
 #define DP_TX_DESC_FLAG_COMPLETED_TX	0x40
 #define DP_TX_DESC_FLAG_ME		0x80
 #define DP_TX_DESC_FLAG_TDLS_FRAME	0x100
+#define DP_TX_DESC_FLAG_ALLOCATED	0x200
 
 #define DP_TX_FREE_SINGLE_BUF(soc, buf)                  \
 do {                                                           \

dp/wifi3.0/dp_tx_desc.h

@@ -726,6 +726,24 @@ dp_tx_is_desc_id_valid(struct dp_soc *soc, uint32_t tx_desc_id)
 }
 #endif /* QCA_DP_TX_DESC_ID_CHECK */
 
+#ifdef QCA_DP_TX_DESC_FAST_COMP_ENABLE
+static inline void dp_tx_desc_update_fast_comp_flag(struct dp_soc *soc,
+						    struct dp_tx_desc_s *desc,
+						    uint8_t allow_fast_comp)
+{
+	if (qdf_likely(!(desc->flags & DP_TX_DESC_FLAG_TO_FW)) &&
+	    qdf_likely(allow_fast_comp)) {
+		desc->flags |= DP_TX_DESC_FLAG_SIMPLE;
+	}
+}
+#else
+static inline void dp_tx_desc_update_fast_comp_flag(struct dp_soc *soc,
+						    struct dp_tx_desc_s *desc,
+						    uint8_t allow_fast_comp)
+{
+}
+#endif /* QCA_DP_TX_DESC_FAST_COMP_ENABLE */
+
 /**
  * dp_tx_desc_find() - find dp tx descriptor from cokie
  * @soc - handle for the device sending the data

dp/wifi3.0/dp_types.h

@@ -384,15 +384,19 @@ struct dp_tx_ext_desc_pool_s {
 struct dp_tx_desc_s {
 	struct dp_tx_desc_s *next;
 	qdf_nbuf_t nbuf;
+	uint16_t length;
+	uint16_t flags;
+	qdf_dma_addr_t dma_addr;
 	uint32_t id;
 	struct dp_vdev *vdev;
 	struct dp_pdev *pdev;
-	struct dp_tx_ext_desc_elem_s *msdu_ext_desc;
-	uint16_t flags;
-	uint16_t tx_encap_type;
+	uint8_t tx_encap_type;
 	uint8_t frm_type;
 	uint8_t pkt_offset;
 	uint8_t  pool_id;
+	uint16_t peer_id;
+	uint16_t tx_status;
+	struct dp_tx_ext_desc_elem_s *msdu_ext_desc;
 	void *me_buffer;
 	void *tso_desc;
 	void *tso_num_desc;

hal/wifi3.0/hal_tx.h

@@ -804,6 +804,42 @@ uint8_t hal_tx_comp_get_release_reason(void *hal_desc,
 	return hal_soc->ops->hal_tx_comp_get_release_reason(hal_desc);
 }
 
+/**
+ * hal_tx_comp_get_peer_id() - Get peer_id value()
+ * @hal_desc: completion ring descriptor pointer
+ *
+ * This function will get peer_id value from Tx completion descriptor
+ *
+ * Return: buffer release source
+ */
+static inline uint16_t hal_tx_comp_get_peer_id(void *hal_desc)
+{
+	uint32_t comp_desc =
+		*(uint32_t *)(((uint8_t *)hal_desc) +
+			       WBM_RELEASE_RING_7_SW_PEER_ID_OFFSET);
+
+	return (comp_desc & WBM_RELEASE_RING_7_SW_PEER_ID_MASK) >>
+		WBM_RELEASE_RING_7_SW_PEER_ID_LSB;
+}
+
+/**
+ * hal_tx_comp_get_tx_status() - Get tx transmission status()
+ * @hal_desc: completion ring descriptor pointer
+ *
+ * This function will get transmit status value from Tx completion descriptor
+ *
+ * Return: buffer release source
+ */
+static inline uint8_t hal_tx_comp_get_tx_status(void *hal_desc)
+{
+	uint32_t comp_desc =
+		*(uint32_t *)(((uint8_t *)hal_desc) +
+			       WBM_RELEASE_RING_2_TQM_RELEASE_REASON_OFFSET);
+
+	return (comp_desc & WBM_RELEASE_RING_2_TQM_RELEASE_REASON_MASK) >>
+		WBM_RELEASE_RING_2_TQM_RELEASE_REASON_LSB;
+}
+
 /**
  * hal_tx_comp_desc_sync() - collect hardware descriptor contents
  * @hal_desc: hardware descriptor pointer