[PATCH v3 4/5] net/mlx5: select Rx/Tx callbacks when starting device

[Yongseok Koh <yskoh@mellanox.com>]

The callbacks are global to a device but the seletion is made every queue
configuration, which is redundant.

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
---
 drivers/net/mlx5/mlx5_ethdev.c  | 23 +++++++++++------------
 drivers/net/mlx5/mlx5_rxq.c     |  2 --
 drivers/net/mlx5/mlx5_trigger.c |  3 +++
 drivers/net/mlx5/mlx5_txq.c     |  2 --
 4 files changed, 14 insertions(+), 16 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
index 96bccd5fd..4a77eac50 100644
--- a/drivers/net/mlx5/mlx5_ethdev.c
+++ b/drivers/net/mlx5/mlx5_ethdev.c
@@ -923,8 +923,6 @@ mlx5_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
 	struct priv *priv = dev->data->dev_private;
 	int ret = 0;
 	unsigned int i;
-	uint16_t (*rx_func)(void *, struct rte_mbuf **, uint16_t) =
-		mlx5_rx_burst;
 	unsigned int max_frame_len;
 	int rehash;
 	int restart = priv->started;
@@ -944,7 +942,7 @@ mlx5_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
 	/* Temporarily replace RX handler with a fake one, assuming it has not
 	 * been copied elsewhere. */
 	dev->rx_pkt_burst = removed_rx_burst;
-	/* Make sure everyone has left mlx5_rx_burst() and uses
+	/* Make sure everyone has left dev->rx_pkt_burst() and uses
 	 * removed_rx_burst() instead. */
 	rte_wmb();
 	usleep(1000);
@@ -1018,17 +1016,13 @@ mlx5_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
 		/* Double fault, disable RX. */
 		break;
 	}
-	/*
-	 * Use a safe RX burst function in case of error, otherwise mimic
-	 * mlx5_dev_start().
-	 */
+	/* Mimic mlx5_dev_start(). */
 	if (ret) {
 		ERROR("unable to reconfigure RX queues, RX disabled");
-		rx_func = removed_rx_burst;
 	} else if (restart &&
-		 !rehash &&
-		 !priv_create_hash_rxqs(priv) &&
-		 !priv_rehash_flows(priv)) {
+		   !rehash &&
+		   !priv_create_hash_rxqs(priv) &&
+		   !priv_rehash_flows(priv)) {
 		if (dev->data->dev_conf.fdir_conf.mode == RTE_FDIR_MODE_NONE)
 			priv_fdir_enable(priv);
 		priv_dev_interrupt_handler_install(priv, dev);
@@ -1036,7 +1030,12 @@ mlx5_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
 	priv->mtu = mtu;
 	/* Burst functions can now be called again. */
 	rte_wmb();
-	dev->rx_pkt_burst = rx_func;
+	/*
+	 * Use a safe RX burst function in case of error, otherwise select RX
+	 * burst function again.
+	 */
+	if (!ret)
+		priv_select_rx_function(priv);
 out:
 	priv_unlock(priv);
 	assert(ret >= 0);
diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index 22be999e8..98b20eb92 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -1226,8 +1226,6 @@ mlx5_rx_queue_setup(struct rte_eth_dev *dev, uint16_t idx, uint16_t desc,
 		DEBUG("%p: adding RX queue %p to list",
 		      (void *)dev, (void *)rxq_ctrl);
 		(*priv->rxqs)[idx] = &rxq_ctrl->rxq;
-		/* Update receive callback. */
-		priv_select_rx_function(priv);
 	}
 	priv_unlock(priv);
 	return -ret;
diff --git a/drivers/net/mlx5/mlx5_trigger.c b/drivers/net/mlx5/mlx5_trigger.c
index 40f23da93..595a9e064 100644
--- a/drivers/net/mlx5/mlx5_trigger.c
+++ b/drivers/net/mlx5/mlx5_trigger.c
@@ -72,6 +72,9 @@ mlx5_dev_start(struct rte_eth_dev *dev)
 		priv_unlock(priv);
 		return 0;
 	}
+	/* Update Rx/Tx callback. */
+	priv_select_tx_function(priv);
+	priv_select_rx_function(priv);
 	DEBUG("%p: allocating and configuring hash RX queues", (void *)dev);
 	err = priv_create_hash_rxqs(priv);
 	if (!err)
diff --git a/drivers/net/mlx5/mlx5_txq.c b/drivers/net/mlx5/mlx5_txq.c
index ac9dfc5f0..03e23f58d 100644
--- a/drivers/net/mlx5/mlx5_txq.c
+++ b/drivers/net/mlx5/mlx5_txq.c
@@ -496,8 +496,6 @@ mlx5_tx_queue_setup(struct rte_eth_dev *dev, uint16_t idx, uint16_t desc,
 		DEBUG("%p: adding TX queue %p to list",
 		      (void *)dev, (void *)txq_ctrl);
 		(*priv->txqs)[idx] = &txq_ctrl->txq;
-		/* Update send callback. */
-		priv_select_tx_function(priv);
 	}
 	priv_unlock(priv);
 	return -ret;
-- 
2.11.0