[dpdk-dev] [PATCH 07/40] net/virtio: move MSIX detection to PCI ethdev

[Maxime Coquelin]

There is no point it detecting whether we can use MSIX
every time the interrupt is enabled/disabled/masked.

Let's do it once for all at PCI device init time.

Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com>
---
 drivers/net/virtio/virtio_ethdev.c | 15 ---------------
 drivers/net/virtio/virtio_pci.c    |  5 ++++-
 2 files changed, 4 insertions(+), 16 deletions(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c 
b/drivers/net/virtio/virtio_ethdev.c
index 4032a89396..67f6be3fa8 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1282,42 +1282,27 @@ virtio_vlan_filter_set(struct rte_eth_dev *dev, 
uint16_t vlan_id, int on)
 static int
 virtio_intr_unmask(struct rte_eth_dev *dev)
 {
-       struct virtio_hw *hw = dev->data->dev_private;
-
        if (rte_intr_ack(dev->intr_handle) < 0)
                return -1;
 
-       if (hw->bus_type == VIRTIO_BUS_PCI_LEGACY || hw->bus_type == 
VIRTIO_BUS_PCI_MODERN)
-               hw->use_msix = vtpci_msix_detect(RTE_ETH_DEV_TO_PCI(dev));
-
        return 0;
 }
 
 static int
 virtio_intr_enable(struct rte_eth_dev *dev)
 {
-       struct virtio_hw *hw = dev->data->dev_private;
-
        if (rte_intr_enable(dev->intr_handle) < 0)
                return -1;
 
-       if (hw->bus_type == VIRTIO_BUS_PCI_LEGACY || hw->bus_type == 
VIRTIO_BUS_PCI_MODERN)
-               hw->use_msix = vtpci_msix_detect(RTE_ETH_DEV_TO_PCI(dev));
-
        return 0;
 }
 
 static int
 virtio_intr_disable(struct rte_eth_dev *dev)
 {
-       struct virtio_hw *hw = dev->data->dev_private;
-
        if (rte_intr_disable(dev->intr_handle) < 0)
                return -1;
 
-       if (hw->bus_type == VIRTIO_BUS_PCI_LEGACY || hw->bus_type == 
VIRTIO_BUS_PCI_MODERN)
-               hw->use_msix = vtpci_msix_detect(RTE_ETH_DEV_TO_PCI(dev));
-
        return 0;
 }
 
diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
index 1692268f30..8605254e53 100644
--- a/drivers/net/virtio/virtio_pci.c
+++ b/drivers/net/virtio/virtio_pci.c
@@ -698,7 +698,7 @@ vtpci_init(struct rte_pci_device *dev, struct virtio_hw *hw)
                PMD_INIT_LOG(INFO, "modern virtio pci detected.");
                virtio_hw_internal[hw->port_id].vtpci_ops = &modern_ops;
                hw->bus_type = VIRTIO_BUS_PCI_MODERN;
-               return 0;
+               goto msix_detect;
        }
 
        PMD_INIT_LOG(INFO, "trying with legacy virtio pci.");
@@ -718,6 +718,9 @@ vtpci_init(struct rte_pci_device *dev, struct virtio_hw *hw)
        virtio_hw_internal[hw->port_id].vtpci_ops = &legacy_ops;
        hw->bus_type = VIRTIO_BUS_PCI_LEGACY;
 
+msix_detect:
+       hw->use_msix = vtpci_msix_detect(dev);
+
        return 0;
 }
 
-- 
2.29.2