diff options
Diffstat (limited to 'drivers/net/virtio/virtio_pci.c')
| -rw-r--r-- | drivers/net/virtio/virtio_pci.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c index b7b3d615..f91ecb4c 100644 --- a/drivers/net/virtio/virtio_pci.c +++ b/drivers/net/virtio/virtio_pci.c @@ -579,6 +579,8 @@ get_cfg_addr(struct rte_pci_device *dev, struct virtio_pci_cap *cap) return base + offset; } +#define PCI_MSIX_ENABLE 0x8000 + static int virtio_read_caps(struct rte_pci_device *dev, struct virtio_hw *hw) { @@ -605,8 +607,17 @@ virtio_read_caps(struct rte_pci_device *dev, struct virtio_hw *hw) break; } - if (cap.cap_vndr == PCI_CAP_ID_MSIX) - hw->use_msix = 1; + if (cap.cap_vndr == PCI_CAP_ID_MSIX) { + /* Transitional devices would also have this capability, + * that's why we also check if msix is enabled. + * 1st byte is cap ID; 2nd byte is the position of next + * cap; next two bytes are the flags. + */ + uint16_t flags = ((uint16_t *)&cap)[1]; + + if (flags & PCI_MSIX_ENABLE) + hw->use_msix = 1; + } if (cap.cap_vndr != PCI_CAP_ID_VNDR) { PMD_INIT_LOG(DEBUG, |