bus/pci: resize interrupt event list only for MSIX

Resizing event list only makes sense in MSIX case.

Besides, event list has always been RTE_MAX_RXTX_INTR_VEC_ID large.
Let's restore this assumption for code that might rely on this property
and only enlarge the event list when necessary.

Bugzilla ID: 843, 865
Fixes: 8cb5d08db940 ("interrupts: extend event list")

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Harman Kalra <hkalra@marvell.com>

diff --git a/drivers/bus/pci/linux/pci_vfio.c b/drivers/bus/pci/linux/pci_vfio.c
index f622e7f..edcee92 100644 (file)
--- a/drivers/bus/pci/linux/pci_vfio.c
+++ b/drivers/bus/pci/linux/pci_vfio.c
@@ -266,12 +266,6 @@ pci_vfio_setup_interrupts(struct rte_pci_device *dev, int vfio_dev_fd)
                        return -1;
                }
 
-               /* Reallocate the efds and elist fields of intr_handle based
-                * on PCI device MSIX size.
-                */
-               if (rte_intr_event_list_update(dev->intr_handle, irq.count))
-                       return -1;
-
                /* if this vector cannot be used with eventfd, fail if we explicitly
                 * specified interrupt type, otherwise continue */
                if ((irq.flags & VFIO_IRQ_INFO_EVENTFD) == 0) {
@@ -283,6 +277,14 @@ pci_vfio_setup_interrupts(struct rte_pci_device *dev, int vfio_dev_fd)
                                continue;
                }
 
+               /* Reallocate the efds and elist fields of intr_handle based
+                * on PCI device MSIX size.
+                */
+               if (i == VFIO_PCI_MSIX_IRQ_INDEX &&
+                               (uint32_t)rte_intr_nb_intr_get(dev->intr_handle) < irq.count &&
+                               rte_intr_event_list_update(dev->intr_handle, irq.count))
+                       return -1;
+
                /* set up an eventfd for interrupts */
                fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
                if (fd < 0) {