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bus/pci: resize interrupt event list only for MSIX

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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: 8cb5d08db9 ("interrupts: extend event list")

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Harman Kalra <hkalra@marvell.com>
This commit is contained in:
David Marchand 2021-10-29 09:38:19 +02:00
parent efb57dd5bb
commit eb89595d45
1 changed files with 8 additions and 6 deletions
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14
drivers/bus/pci/linux/pci_vfio.c
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@ -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) {