+
+enum virtio_msix_status
+vtpci_msix_detect(struct rte_pci_device *dev)
+{
+ uint8_t pos;
+ struct virtio_pci_cap cap;
+ int ret;
+
+ ret = rte_pci_read_config(dev, &pos, 1, PCI_CAPABILITY_LIST);
+ if (ret < 0) {
+ PMD_INIT_LOG(DEBUG, "failed to read pci capability list");
+ return VIRTIO_MSIX_NONE;
+ }
+
+ while (pos) {
+ ret = rte_pci_read_config(dev, &cap, sizeof(cap), pos);
+ if (ret < 0) {
+ PMD_INIT_LOG(ERR,
+ "failed to read pci cap at pos: %x", pos);
+ break;
+ }
+
+ if (cap.cap_vndr == PCI_CAP_ID_MSIX) {
+ uint16_t flags = ((uint16_t *)&cap)[1];
+
+ if (flags & PCI_MSIX_ENABLE)
+ return VIRTIO_MSIX_ENABLED;
+ else
+ return VIRTIO_MSIX_DISABLED;
+ }
+
+ pos = cap.cap_next;
+ }
+
+ return VIRTIO_MSIX_NONE;
+}