[dpdk-dev] [PATCH] interrupts: do not resize event list for non MSIX

[David Marchand]

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 at redhat.com>
---
 drivers/bus/pci/linux/pci_vfio.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/bus/pci/linux/pci_vfio.c b/drivers/bus/pci/linux/pci_vfio.c
index f622e7f8e6..edcee92556 100644
--- 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) {
-- 
2.23.0