From 5c0c6a6f7421cad0cb5ea38a78cccd5dbcf0dfa8 Mon Sep 17 00:00:00 2001
From: Michal Krawczyk <mk@semihalf.com>
Date: Thu, 25 Oct 2018 19:59:21 +0200
Subject: [PATCH 036/166] net/ena: recreate HW IO rings on start and stop

On the start the driver was refilling all Rx buffs, but the old ones
were not released. That way running start/stop for a few times was
causing device to run out of descriptors.

To fix the issue, IO rings are now being destroyed on stop, and
recreated on start. That way the device is not losing any descriptors.

Furthermore, there was also memory leak for the Rx mbufs, which were
created on start and not destroyed on stop.

Fixes: eb0ef49dd5d5 ("net/ena: add stop and uninit routines")
Cc: stable@dpdk.org

Signed-off-by: Michal Krawczyk <mk@semihalf.com>
---
 drivers/net/ena/ena_ethdev.c | 196 ++++++++++++++++-------------------
 1 file changed, 91 insertions(+), 105 deletions(-)

diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 61d14c9a38..e01f52904c 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -241,6 +241,8 @@ static void ena_rx_queue_release_bufs(struct ena_ring *ring);
 static void ena_tx_queue_release_bufs(struct ena_ring *ring);
 static int ena_link_update(struct rte_eth_dev *dev,
 			   int wait_to_complete);
+static int ena_create_io_queue(struct ena_ring *ring);
+static void ena_free_io_queues_all(struct ena_adapter *adapter);
 static int ena_queue_restart(struct ena_ring *ring);
 static int ena_queue_restart_all(struct rte_eth_dev *dev,
 				 enum ena_ring_type ring_type);
@@ -512,7 +514,8 @@ static void ena_close(struct rte_eth_dev *dev)
 	struct ena_adapter *adapter =
 		(struct ena_adapter *)(dev->data->dev_private);
 
-	ena_stop(dev);
+	if (adapter->state == ENA_ADAPTER_STATE_RUNNING)
+		ena_stop(dev);
 	adapter->state = ENA_ADAPTER_STATE_CLOSED;
 
 	ena_rx_queue_release_all(dev);
@@ -748,21 +751,12 @@ static void ena_tx_queue_release_all(struct rte_eth_dev *dev)
 static void ena_rx_queue_release(void *queue)
 {
 	struct ena_ring *ring = (struct ena_ring *)queue;
-	struct ena_adapter *adapter = ring->adapter;
-	int ena_qid;
 
 	ena_assert_msg(ring->configured,
 		       "API violation - releasing not configured queue");
 	ena_assert_msg(ring->adapter->state != ENA_ADAPTER_STATE_RUNNING,
 		       "API violation");
 
-	/* Destroy HW queue */
-	ena_qid = ENA_IO_RXQ_IDX(ring->id);
-	ena_com_destroy_io_queue(&adapter->ena_dev, ena_qid);
-
-	/* Free all bufs */
-	ena_rx_queue_release_bufs(ring);
-
 	/* Free ring resources */
 	if (ring->rx_buffer_info)
 		rte_free(ring->rx_buffer_info);
@@ -781,18 +775,12 @@ static void ena_rx_queue_release(void *queue)
 static void ena_tx_queue_release(void *queue)
 {
 	struct ena_ring *ring = (struct ena_ring *)queue;
-	struct ena_adapter *adapter = ring->adapter;
-	int ena_qid;
 
 	ena_assert_msg(ring->configured,
 		       "API violation. Releasing not configured queue");
 	ena_assert_msg(ring->adapter->state != ENA_ADAPTER_STATE_RUNNING,
 		       "API violation");
 
-	/* Destroy HW queue */
-	ena_qid = ENA_IO_TXQ_IDX(ring->id);
-	ena_com_destroy_io_queue(&adapter->ena_dev, ena_qid);
-
 	/* Free all bufs */
 	ena_tx_queue_release_bufs(ring);
 
@@ -1080,10 +1068,86 @@ static void ena_stop(struct rte_eth_dev *dev)
 		(struct ena_adapter *)(dev->data->dev_private);
 
 	rte_timer_stop_sync(&adapter->timer_wd);
+	ena_free_io_queues_all(adapter);
 
 	adapter->state = ENA_ADAPTER_STATE_STOPPED;
 }
 
+static int ena_create_io_queue(struct ena_ring *ring)
+{
+	struct ena_adapter *adapter;
+	struct ena_com_dev *ena_dev;
+	struct ena_com_create_io_ctx ctx =
+		/* policy set to _HOST just to satisfy icc compiler */
+		{ ENA_ADMIN_PLACEMENT_POLICY_HOST,
+		  0, 0, 0, 0, 0 };
+	uint16_t ena_qid;
+	int rc;
+
+	adapter = ring->adapter;
+	ena_dev = &adapter->ena_dev;
+
+	if (ring->type == ENA_RING_TYPE_TX) {
+		ena_qid = ENA_IO_TXQ_IDX(ring->id);
+		ctx.direction = ENA_COM_IO_QUEUE_DIRECTION_TX;
+		ctx.mem_queue_type = ena_dev->tx_mem_queue_type;
+		ctx.queue_size = adapter->tx_ring_size;
+	} else {
+		ena_qid = ENA_IO_RXQ_IDX(ring->id);
+		ctx.direction = ENA_COM_IO_QUEUE_DIRECTION_RX;
+		ctx.queue_size = adapter->rx_ring_size;
+	}
+	ctx.qid = ena_qid;
+	ctx.msix_vector = -1; /* interrupts not used */
+	ctx.numa_node = ena_cpu_to_node(ring->id);
+
+	rc = ena_com_create_io_queue(ena_dev, &ctx);
+	if (rc) {
+		RTE_LOG(ERR, PMD,
+			"failed to create io queue #%d (qid:%d) rc: %d\n",
+			ring->id, ena_qid, rc);
+		return rc;
+	}
+
+	rc = ena_com_get_io_handlers(ena_dev, ena_qid,
+				     &ring->ena_com_io_sq,
+				     &ring->ena_com_io_cq);
+	if (rc) {
+		RTE_LOG(ERR, PMD,
+			"Failed to get io queue handlers. queue num %d rc: %d\n",
+			ring->id, rc);
+		ena_com_destroy_io_queue(ena_dev, ena_qid);
+		return rc;
+	}
+
+	if (ring->type == ENA_RING_TYPE_TX)
+		ena_com_update_numa_node(ring->ena_com_io_cq, ctx.numa_node);
+
+	return 0;
+}
+
+static void ena_free_io_queues_all(struct ena_adapter *adapter)
+{
+	struct rte_eth_dev *eth_dev = adapter->rte_dev;
+	struct ena_com_dev *ena_dev = &adapter->ena_dev;
+	int i;
+	uint16_t ena_qid;
+	uint16_t nb_rxq = eth_dev->data->nb_rx_queues;
+	uint16_t nb_txq = eth_dev->data->nb_tx_queues;
+
+	for (i = 0; i < nb_txq; ++i) {
+		ena_qid = ENA_IO_TXQ_IDX(i);
+		ena_com_destroy_io_queue(ena_dev, ena_qid);
+	}
+
+	for (i = 0; i < nb_rxq; ++i) {
+		ena_qid = ENA_IO_RXQ_IDX(i);
+		ena_com_destroy_io_queue(ena_dev, ena_qid);
+
+		ena_rx_queue_release_bufs(&adapter->rx_ring[i]);
+	}
+}
+
 static int ena_queue_restart(struct ena_ring *ring)
 {
 	int rc, bufs_num;
@@ -1091,6 +1155,12 @@ static int ena_queue_restart(struct ena_ring *ring)
 	ena_assert_msg(ring->configured == 1,
 		       "Trying to restart unconfigured queue\n");
 
+	rc = ena_create_io_queue(ring);
+	if (rc) {
+		PMD_INIT_LOG(ERR, "Failed to create IO queue!\n");
+		return rc;
+	}
+
 	ring->next_to_clean = 0;
 	ring->next_to_use = 0;
 
@@ -1113,17 +1183,10 @@ static int ena_tx_queue_setup(struct rte_eth_dev *dev,
 			      __rte_unused unsigned int socket_id,
 			      const struct rte_eth_txconf *tx_conf)
 {
-	struct ena_com_create_io_ctx ctx =
-		/* policy set to _HOST just to satisfy icc compiler */
-		{ ENA_ADMIN_PLACEMENT_POLICY_HOST,
-		  ENA_COM_IO_QUEUE_DIRECTION_TX, 0, 0, 0, 0 };
 	struct ena_ring *txq = NULL;
 	struct ena_adapter *adapter =
 		(struct ena_adapter *)(dev->data->dev_private);
 	unsigned int i;
-	int ena_qid;
-	int rc;
-	struct ena_com_dev *ena_dev = &adapter->ena_dev;
 
 	txq = &adapter->tx_ring[queue_idx];
 
@@ -1154,37 +1217,6 @@ static int ena_tx_queue_setup(struct rte_eth_dev *dev,
 		return -EINVAL;
 	}
 
-	ena_qid = ENA_IO_TXQ_IDX(queue_idx);
-
-	ctx.direction = ENA_COM_IO_QUEUE_DIRECTION_TX;
-	ctx.qid = ena_qid;
-	ctx.msix_vector = -1; /* admin interrupts not used */
-	ctx.mem_queue_type = ena_dev->tx_mem_queue_type;
-	ctx.queue_size = adapter->tx_ring_size;
-	ctx.numa_node = ena_cpu_to_node(queue_idx);
-
-	rc = ena_com_create_io_queue(ena_dev, &ctx);
-	if (rc) {
-		RTE_LOG(ERR, PMD,
-			"failed to create io TX queue #%d (qid:%d) rc: %d\n",
-			queue_idx, ena_qid, rc);
-		return rc;
-	}
-	txq->ena_com_io_cq = &ena_dev->io_cq_queues[ena_qid];
-	txq->ena_com_io_sq = &ena_dev->io_sq_queues[ena_qid];
-
-	rc = ena_com_get_io_handlers(ena_dev, ena_qid,
-				     &txq->ena_com_io_sq,
-				     &txq->ena_com_io_cq);
-	if (rc) {
-		RTE_LOG(ERR, PMD,
-			"Failed to get TX queue handlers. TX queue num %d rc: %d\n",
-			queue_idx, rc);
-		goto err_destroy_io_queue;
-	}
-
-	ena_com_update_numa_node(txq->ena_com_io_cq, ctx.numa_node);
-
 	txq->port_id = dev->data->port_id;
 	txq->next_to_clean = 0;
 	txq->next_to_use = 0;
@@ -1196,8 +1228,7 @@ static int ena_tx_queue_setup(struct rte_eth_dev *dev,
 					  RTE_CACHE_LINE_SIZE);
 	if (!txq->tx_buffer_info) {
 		RTE_LOG(ERR, PMD, "failed to alloc mem for tx buffer info\n");
-		rc = -ENOMEM;
-		goto err_destroy_io_queue;
+		return -ENOMEM;
 	}
 
 	txq->empty_tx_reqs = rte_zmalloc("txq->empty_tx_reqs",
@@ -1205,8 +1236,8 @@ static int ena_tx_queue_setup(struct rte_eth_dev *dev,
 					 RTE_CACHE_LINE_SIZE);
 	if (!txq->empty_tx_reqs) {
 		RTE_LOG(ERR, PMD, "failed to alloc mem for tx reqs\n");
-		rc = -ENOMEM;
-		goto err_free;
+		rte_free(txq->tx_buffer_info);
+		return -ENOMEM;
 	}
 
 	for (i = 0; i < txq->ring_size; i++)
@@ -1219,13 +1250,6 @@ static int ena_tx_queue_setup(struct rte_eth_dev *dev,
 	dev->data->tx_queues[queue_idx] = txq;
 
 	return 0;
-
-err_free:
-	rte_free(txq->tx_buffer_info);
-
-err_destroy_io_queue:
-	ena_com_destroy_io_queue(ena_dev, ena_qid);
-	return rc;
 }
 
 static int ena_rx_queue_setup(struct rte_eth_dev *dev,
@@ -1235,16 +1259,10 @@ static int ena_rx_queue_setup(struct rte_eth_dev *dev,
 			      const struct rte_eth_rxconf *rx_conf,
 			      struct rte_mempool *mp)
 {
-	struct ena_com_create_io_ctx ctx =
-		/* policy set to _HOST just to satisfy icc compiler */
-		{ ENA_ADMIN_PLACEMENT_POLICY_HOST,
-		  ENA_COM_IO_QUEUE_DIRECTION_RX, 0, 0, 0, 0 };
 	struct ena_adapter *adapter =
 		(struct ena_adapter *)(dev->data->dev_private);
 	struct ena_ring *rxq = NULL;
-	uint16_t ena_qid = 0;
-	int i, rc = 0;
-	struct ena_com_dev *ena_dev = &adapter->ena_dev;
+	int i;
 
 	rxq = &adapter->rx_ring[queue_idx];
 	if (rxq->configured) {
@@ -1273,36 +1291,6 @@ static int ena_rx_queue_setup(struct rte_eth_dev *dev,
 		return -EINVAL;
 	}
 
-	ena_qid = ENA_IO_RXQ_IDX(queue_idx);
-
-	ctx.qid = ena_qid;
-	ctx.direction = ENA_COM_IO_QUEUE_DIRECTION_RX;
-	ctx.mem_queue_type = ENA_ADMIN_PLACEMENT_POLICY_HOST;
-	ctx.msix_vector = -1; /* admin interrupts not used */
-	ctx.queue_size = adapter->rx_ring_size;
-	ctx.numa_node = ena_cpu_to_node(queue_idx);
-
-	rc = ena_com_create_io_queue(ena_dev, &ctx);
-	if (rc) {
-		RTE_LOG(ERR, PMD, "failed to create io RX queue #%d rc: %d\n",
-			queue_idx, rc);
-		return rc;
-	}
-
-	rxq->ena_com_io_cq = &ena_dev->io_cq_queues[ena_qid];
-	rxq->ena_com_io_sq = &ena_dev->io_sq_queues[ena_qid];
-
-	rc = ena_com_get_io_handlers(ena_dev, ena_qid,
-				     &rxq->ena_com_io_sq,
-				     &rxq->ena_com_io_cq);
-	if (rc) {
-		RTE_LOG(ERR, PMD,
-			"Failed to get RX queue handlers. RX queue num %d rc: %d\n",
-			queue_idx, rc);
-		ena_com_destroy_io_queue(ena_dev, ena_qid);
-		return rc;
-	}
-
 	rxq->port_id = dev->data->port_id;
 	rxq->next_to_clean = 0;
 	rxq->next_to_use = 0;
@@ -1314,7 +1302,6 @@ static int ena_rx_queue_setup(struct rte_eth_dev *dev,
 					  RTE_CACHE_LINE_SIZE);
 	if (!rxq->rx_buffer_info) {
 		RTE_LOG(ERR, PMD, "failed to alloc mem for rx buffer info\n");
-		ena_com_destroy_io_queue(ena_dev, ena_qid);
 		return -ENOMEM;
 	}
 
@@ -1325,7 +1312,6 @@ static int ena_rx_queue_setup(struct rte_eth_dev *dev,
 		RTE_LOG(ERR, PMD, "failed to alloc mem for empty rx reqs\n");
 		rte_free(rxq->rx_buffer_info);
 		rxq->rx_buffer_info = NULL;
-		ena_com_destroy_io_queue(ena_dev, ena_qid);
 		return -ENOMEM;
 	}
 
@@ -1336,7 +1322,7 @@ static int ena_rx_queue_setup(struct rte_eth_dev *dev,
 	rxq->configured = 1;
 	dev->data->rx_queues[queue_idx] = rxq;
 
-	return rc;
+	return 0;
 }
 
 static int ena_populate_rx_queue(struct ena_ring *rxq, unsigned int count)
-- 
2.25.1

