The FM10K driver has 3 BARS numbered 0, 4, and 8. But the kernel VFIO driver only allows mapping 0-5 anything bigger than that will return -EINVAL (see kernel source vfio_pci.c:vfio_pci_mmap).
The workaround is to limit the DPDK EAL VFIO support only map the regions that will work. The FM10K driver is not using BAR8 in current code anyway. Signed-off-by: Stephen Hemminger <stephen at networkplumber.org> --- lib/librte_eal/linuxapp/eal/eal_pci_vfio.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c index 426953a..e269e75 100644 --- a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c +++ b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c @@ -549,7 +549,7 @@ pci_vfio_map_resource(struct rte_pci_device *dev) int iommu_group_no; char pci_addr[PATH_MAX] = {0}; struct rte_pci_addr *loc = &dev->addr; - int i, ret, msix_bar; + int i, ret, msix_bar, nmaps; struct mapped_pci_resource *vfio_res = NULL; struct mapped_pci_res_list *vfio_res_list = RTE_TAILQ_CAST(rte_vfio_tailq.head, mapped_pci_res_list); @@ -724,7 +724,9 @@ pci_vfio_map_resource(struct rte_pci_device *dev) /* map BARs */ maps = vfio_res->maps; - for (i = 0; i < (int) vfio_res->nb_maps; i++) { + /* VFIO supports limited (0-5) maps */ + nmaps = RTE_MIN(vfio_res->nb_maps, VFIO_PCI_ROM_REGION_INDEX - 1); + for (i = 0; i < nmaps; i++) { struct vfio_region_info reg = { .argsz = sizeof(reg) }; void *bar_addr; struct memreg { -- 2.1.4