bus/pci: add Mellanox kernel driver type

When checking RTE_PCI_DRV_IOVA_AS_VA flag to determine IOVA mode,
pci_one_device_has_iova_va() returns true only if kernel driver of the
device is vfio. However, Mellanox mlx4/5 PMD doesn't need to be detached
from kernel driver and attached to VFIO/UIO. Control path still goes
through the existing kernel driver, which is mlx4_core/mlx5_core. In order
to make RTE_PCI_DRV_IOVA_AS_VA effective for mlx4/mlx5 PMD, a new kernel
driver type has to be introduced.

Cc: stable@dpdk.org

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>

drivers/bus/pci/linux/pci.c

@@ -329,6 +329,9 @@ pci_scan_one(const char *dirname, const struct rte_pci_addr *addr)
 			dev->kdrv = RTE_KDRV_IGB_UIO;
 		else if (!strcmp(driver, "uio_pci_generic"))
 			dev->kdrv = RTE_KDRV_UIO_GENERIC;
+		else if (!strcmp(driver, "mlx4_core") ||
+				!strcmp(driver, "mlx5_core"))
+			dev->kdrv = RTE_KDRV_NIC_MLX;
 		else
 			dev->kdrv = RTE_KDRV_UNKNOWN;
 	} else
@@ -568,7 +571,8 @@ pci_one_device_has_iova_va(void)
 	FOREACH_DRIVER_ON_PCIBUS(drv) {
 		if (drv && drv->drv_flags & RTE_PCI_DRV_IOVA_AS_VA) {
 			FOREACH_DEVICE_ON_PCIBUS(dev) {
-				if (dev->kdrv == RTE_KDRV_VFIO &&
+				if ((dev->kdrv == RTE_KDRV_VFIO ||
+				     dev->kdrv == RTE_KDRV_NIC_MLX) &&
 				    rte_pci_match(drv, dev))
 					return 1;
 			}

lib/librte_eal/common/include/rte_dev.h

@@ -63,6 +63,7 @@ enum rte_kernel_driver {
 	RTE_KDRV_VFIO,
 	RTE_KDRV_UIO_GENERIC,
 	RTE_KDRV_NIC_UIO,
+	RTE_KDRV_NIC_MLX,
 	RTE_KDRV_NONE,
 };