[dpdk-dev] [PATCH 09/16] [RFC] [VFIO] Enable VFIO device binding
Burakov, Anatoly
anatoly.burakov at intel.com
Thu May 1 13:06:07 CEST 2014
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 at intel.com>
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index dc21645..3f659ff 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -400,7 +400,7 @@ int
rte_eal_pci_probe_one_driver(struct rte_pci_driver *dr, struct rte_pci_device *dev)
{
struct rte_pci_id *id_table;
- int ret = 0;
+ int ret, mapped = 0;
for (id_table = dr->id_table ; id_table->vendor_id != 0; id_table++) {
@@ -435,10 +435,15 @@ 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 && pci_vfio_map_resource(dev) == 0) {
+ mapped = 1;
+ }
+#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) {
/* unbind current driver */
@@ -472,5 +477,48 @@ 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;
}
--
1.8.1.4
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