From: Gregory Etelson <getelson@nvidia.com>
Date: Tue, 20 Jul 2021 15:38:19 +0000 (+0300)
Subject: net/mlx5: fix representor interrupt handler
X-Git-Url: http://git.droids-corp.org/?p=dpdk.git;a=commitdiff_plain;h=494d6863c2464838e8ee65b9a7d3d108145ae08d

net/mlx5: fix representor interrupt handler

In mlx5 PMD the PCI device interrupt vector was used by Uplink
representor exclusively and other VF representors did not support
interrupt mode.
All the VFs and Uplink representors are separate ethernet devices
and must have dedicated interrupt vectors.
The fix provides each representor with a dedicated interrupt
vector.

Fixes: 5882bde88da2 ("net/mlx5: fix representor interrupts handler")
Cc: stable@dpdk.org

Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---

diff --git a/drivers/net/mlx5/linux/mlx5_os.c b/drivers/net/mlx5/linux/mlx5_os.c
index 4712bd6f9b..14a3b912cc 100644
--- a/drivers/net/mlx5/linux/mlx5_os.c
+++ b/drivers/net/mlx5/linux/mlx5_os.c
@@ -2525,6 +2525,31 @@ mlx5_os_pci_probe_pf(struct rte_pci_device *pci_dev,
 		}
 		restore = list[i].eth_dev->data->dev_flags;
 		rte_eth_copy_pci_info(list[i].eth_dev, pci_dev);
+		/**
+		 * Each representor has a dedicated interrupts vector.
+		 * rte_eth_copy_pci_info() assigns PF interrupts handle to
+		 * representor eth_dev object because representor and PF
+		 * share the same PCI address.
+		 * Override representor device with a dedicated
+		 * interrupts handle here.
+		 * Representor interrupts handle is released in mlx5_dev_stop().
+		 */
+		if (list[i].info.representor) {
+			struct rte_intr_handle *intr_handle;
+			intr_handle = mlx5_malloc(MLX5_MEM_SYS | MLX5_MEM_ZERO,
+						  sizeof(*intr_handle), 0,
+						  SOCKET_ID_ANY);
+			if (!intr_handle) {
+				DRV_LOG(ERR,
+					"port %u failed to allocate memory for interrupt handler "
+					"Rx interrupts will not be supported",
+					i);
+				rte_errno = ENOMEM;
+				ret = -rte_errno;
+				goto exit;
+			}
+			list[i].eth_dev->intr_handle = intr_handle;
+		}
 		/* Restore non-PCI flags cleared by the above call. */
 		list[i].eth_dev->data->dev_flags |= restore;
 		rte_eth_dev_probing_finish(list[i].eth_dev);
diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index f68c7693c7..90990ffdc2 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -1580,6 +1580,11 @@ mlx5_dev_close(struct rte_eth_dev *dev)
 		priv->rxqs_n = 0;
 		priv->rxqs = NULL;
 	}
+	if (priv->representor) {
+		/* Each representor has a dedicated interrupts handler */
+		mlx5_free(dev->intr_handle);
+		dev->intr_handle = NULL;
+	}
 	if (priv->txqs != NULL) {
 		/* XXX race condition if mlx5_tx_burst() is still running. */
 		rte_delay_us_sleep(1000);
diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index 49165f482e..abd8ce7989 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -834,9 +834,6 @@ mlx5_rx_intr_vec_enable(struct rte_eth_dev *dev)
 	unsigned int count = 0;
 	struct rte_intr_handle *intr_handle = dev->intr_handle;
 
-	/* Representor shares dev->intr_handle with PF. */
-	if (priv->representor)
-		return 0;
 	if (!dev->data->dev_conf.intr_conf.rxq)
 		return 0;
 	mlx5_rx_intr_vec_disable(dev);
@@ -917,9 +914,6 @@ mlx5_rx_intr_vec_disable(struct rte_eth_dev *dev)
 	unsigned int rxqs_n = priv->rxqs_n;
 	unsigned int n = RTE_MIN(rxqs_n, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID);
 
-	/* Representor shares dev->intr_handle with PF. */
-	if (priv->representor)
-		return;
 	if (!dev->data->dev_conf.intr_conf.rxq)
 		return;
 	if (!intr_handle->intr_vec)