[PATCH v2 09/16] Enable VFIO device binding

[Anatoly Burakov <anatoly.burakov-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

Add support for binding VFIO devices if RTE_PCI_DRV_NEED_IGB_UIO
is set for this driver. Try VFIO first, if not mapped then try
IGB_UIO too.

Signed-off-by: Anatoly Burakov <anatoly.burakov-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
 lib/librte_eal/linuxapp/eal/eal_pci.c |   55 ++++++++++++++++++++++++++++++++-
 1 files changed, 54 insertions(+), 1 deletions(-)

diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index 7256406..953abe6 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -401,6 +401,7 @@ rte_eal_pci_probe_one_driver(struct rte_pci_driver *dr, struct rte_pci_device *d
 {
 	struct rte_pci_id *id_table;
 	int ret = 0;
+	int mapped = 0;
 
 	for (id_table = dr->id_table ; id_table->vendor_id != 0; id_table++) {
 
@@ -435,8 +436,17 @@ rte_eal_pci_probe_one_driver(struct rte_pci_driver *dr, struct rte_pci_device *d
 		}
 
 		if (dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING) {
+			/* try mapping the NIC resources using VFIO if it exists */
+#ifdef VFIO_PRESENT
+			if (vfio_cfg.vfio_enabled) {
+				if ((ret = pci_vfio_map_resource(dev)) == 0)
+					mapped = 1;
+				else if (ret < 0)
+					return ret;
+			}
+#endif
 			/* map resources for devices that use igb_uio */
-			if ((ret = pci_uio_map_resource(dev)) != 0)
+			if (!mapped && (ret = pci_uio_map_resource(dev)) != 0)
 				return ret;
 		} else if (dr->drv_flags & RTE_PCI_DRV_FORCE_UNBIND &&
 		           rte_eal_process_type() == RTE_PROC_PRIMARY) {
@@ -471,5 +481,48 @@ rte_eal_pci_init(void)
 		RTE_LOG(ERR, EAL, "%s(): Cannot scan PCI bus\n", __func__);
 		return -1;
 	}
+#ifdef VFIO_PRESENT
+	memset(&vfio_cfg, 0, sizeof(vfio_cfg));
+
+	/* initialize group list */
+	int i, ret;
+
+	for (i = 0; i < VFIO_MAX_GROUPS; i++) {
+		vfio_cfg.vfio_groups[i].fd = -1;
+		vfio_cfg.vfio_groups[i].group_no = -1;
+	}
+	vfio_cfg.vfio_container_fd = -1;
+
+	/* check if we have VFIO driver enabled */
+	if (access(VFIO_DIR, F_OK) == 0) {
+		static int socket_fd;
+
+		vfio_cfg.vfio_enabled = 1;
+
+		/* if we are primary process, create a thread to communicate with
+		 * secondary processes. the thread will use a socket to wait for
+		 * requests from secondary process to send open file descriptors,
+		 * because VFIO does not allow multiple open descriptors on a group or
+		 * VFIO container.
+		 */
+		if (internal_config.process_type == RTE_PROC_PRIMARY) {
+			/* set up local socket */
+			if ((socket_fd = pci_vfio_socket_setup()) < 0) {
+				RTE_LOG(ERR, EAL, "Failed to set up local socket!\n");
+				return -1;
+			}
+			ret = pthread_create(&socket_thread, NULL,
+					pci_vfio_socket_thread, (void*) &socket_fd);
+			if (ret) {
+				RTE_LOG(ERR, EAL,
+					"Failed to create thread for communication with secondary "
+					"processes!\n");
+				return -1;
+			}
+		}
+	}
+	else
+		RTE_LOG(INFO, EAL, "VFIO driver not loaded or wrong permissions\n");
+#endif
 	return 0;
 }
-- 
1.7.0.7