[dpdk-dev] [PATCH 2/7] net/mlx4: fix Rx interrupts with multiple ports

[Adrien Mazarguil <adrien.mazarguil@6wind.com>]

Several Ethernet device structures are allocated on top of a common PCI
device for mlx4 adapters with multiple ports. These inherit a common
interrupt handle from their parent PCI device, which prevents Rx interrupts
from working properly on all ports as their configuration is overwritten.

Use a local interrupt handle to address this issue.

Fixes: 9f05a4b81809 ("net/mlx4: support user space Rx interrupt event")

Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Acked-by: Moti Haimovsky <motih@mellanox.com>
---
 drivers/net/mlx4/mlx4.c | 9 +++++++++
 drivers/net/mlx4/mlx4.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index 178562e..2b4722f 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -6207,6 +6207,15 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 
 		eth_dev->device->driver = &mlx4_driver.driver;
 
+		/*
+		 * Copy and override interrupt handle to prevent it from
+		 * being shared between all ethdev instances of a given PCI
+		 * device. This is required to properly handle Rx interrupts
+		 * on all ports.
+		 */
+		priv->intr_handle_dev = *eth_dev->intr_handle;
+		eth_dev->intr_handle = &priv->intr_handle_dev;
+
 		priv->dev = eth_dev;
 		eth_dev->dev_ops = &mlx4_dev_ops;
 
diff --git a/drivers/net/mlx4/mlx4.h b/drivers/net/mlx4/mlx4.h
index c46fc23..b74fbf8 100644
--- a/drivers/net/mlx4/mlx4.h
+++ b/drivers/net/mlx4/mlx4.h
@@ -345,6 +345,7 @@ struct priv {
 	unsigned int txqs_n; /* TX queues array size. */
 	struct rxq *(*rxqs)[]; /* RX queues. */
 	struct txq *(*txqs)[]; /* TX queues. */
+	struct rte_intr_handle intr_handle_dev; /* Device interrupt handler. */
 	struct rte_intr_handle intr_handle; /* Interrupt handler. */
 	struct rte_flow_drop *flow_drop_queue; /* Flow drop queue. */
 	LIST_HEAD(mlx4_flows, rte_flow) flows;
-- 
2.1.4