[dpdk-dev] [PATCH] net/mlx5: fix representor interrupts handler assignment

[dpdk-dev] [PATCH] net/mlx5: fix representor interrupts handler assignment

[Gregory Etelson]

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.

Cc: stable@dpdk.org

Fixes: 5882bde88da2 ("net/mlx5: fix representor interrupts handler")

Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
 drivers/net/mlx5/linux/mlx5_os.c | 25 +++++++++++++++++++++++++
 drivers/net/mlx5/mlx5.c          |  5 +++++
 drivers/net/mlx5/mlx5_rxq.c      |  6 ------
 3 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/drivers/net/mlx5/linux/mlx5_os.c b/drivers/net/mlx5/linux/mlx5_os.c
index be22d9cbd2..96e18f9f57 100644
--- a/drivers/net/mlx5/linux/mlx5_os.c
+++ b/drivers/net/mlx5/linux/mlx5_os.c
@@ -2389,6 +2389,31 @@ 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 44fbc2da83..251ae7181d 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -1548,6 +1548,11 @@ 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 bb9a908087..769b8c625d 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)
-- 
2.31.1

Re: [dpdk-dev] [PATCH] net/mlx5: fix representor interrupts handler assignment

[Raslan Darawsheh]

Hi,

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Gregory Etelson
> Sent: Tuesday, July 20, 2021 6:38 PM
> To: dev@dpdk.org
> Cc: Gregory Etelson <getelson@nvidia.com>; stable@dpdk.org; Slava
> Ovsiienko <viacheslavo@nvidia.com>; Matan Azrad <matan@nvidia.com>;
> Shahaf Shuler <shahafs@nvidia.com>
> Subject: [dpdk-dev] [PATCH] net/mlx5: fix representor interrupts handler
> assignment
> 
> 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.
> 
> Cc: stable@dpdk.org
> 
> Fixes: 5882bde88da2 ("net/mlx5: fix representor interrupts handler")
> 
> Signed-off-by: Gregory Etelson <getelson@nvidia.com>
> Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>

Patch applied to next-net-mlx,

Kindest regards,
Raslan Darawsheh