+
+/* Extract port I/O numbers from proc/ioports */
+static int virtio_resource_init_by_ioports(struct rte_pci_device *pci_dev)
+{
+ uint16_t start, end;
+ int size;
+ FILE *fp;
+ char *line = NULL;
+ char pci_id[16];
+ int found = 0;
+ size_t linesz;
+ struct rte_pci_driver *pci_drv =
+ (struct rte_pci_driver *)pci_dev->driver;
+
+ snprintf(pci_id, sizeof(pci_id), PCI_PRI_FMT,
+ pci_dev->addr.domain,
+ pci_dev->addr.bus,
+ pci_dev->addr.devid,
+ pci_dev->addr.function);
+
+ fp = fopen("/proc/ioports", "r");
+ if (fp == NULL) {
+ PMD_INIT_LOG(ERR, "%s(): can't open ioports", __func__);
+ return -1;
+ }
+
+ while (getdelim(&line, &linesz, '\n', fp) > 0) {
+ char *ptr = line;
+ char *left;
+ int n;
+
+ n = strcspn(ptr, ":");
+ ptr[n] = 0;
+ left = &ptr[n+1];
+
+ while (*left && isspace(*left))
+ left++;
+
+ if (!strncmp(left, pci_id, strlen(pci_id))) {
+ found = 1;
+
+ while (*ptr && isspace(*ptr))
+ ptr++;
+
+ sscanf(ptr, "%04hx-%04hx", &start, &end);
+ size = end - start + 1;
+
+ break;
+ }
+ }
+
+ free(line);
+ fclose(fp);
+
+ if (!found)
+ return -1;
+
+ pci_dev->mem_resource[0].addr = (void *)(uintptr_t)(uint32_t)start;
+ pci_dev->mem_resource[0].len = (uint64_t)size;
+ PMD_INIT_LOG(DEBUG,
+ "PCI Port IO found start=0x%x with size=0x%x",
+ start, size);
+
+ /* can't support lsc interrupt without uio */
+ pci_drv->drv_flags &= ~RTE_PCI_DRV_INTR_LSC;
+
+ return 0;
+}
+
+/* Extract I/O port numbers from sysfs */
+static int virtio_resource_init(struct rte_pci_device *pci_dev)
+{
+ if (virtio_resource_init_by_uio(pci_dev) == 0)
+ return 0;
+ else
+ return virtio_resource_init_by_ioports(pci_dev);
+}
+