vhost: support ifname for vhost-user

[dpdk.git] / lib / librte_vhost / vhost_cuse / virtio-net-cdev.c

diff --git a/lib/librte_vhost/vhost_cuse/virtio-net-cdev.c b/lib/librte_vhost/vhost_cuse/virtio-net-cdev.c
index adebb54..ae2c3fa 100644 (file)
--- a/lib/librte_vhost/vhost_cuse/virtio-net-cdev.c
+++ b/lib/librte_vhost/vhost_cuse/virtio-net-cdev.c
@@ -43,6 +43,10 @@
 #include <sys/mman.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <linux/if_tun.h>
+#include <linux/if.h>
 #include <errno.h>
 
 #include <rte_log.h>
@@ -51,6 +55,7 @@
 #include "vhost-net.h"
 #include "virtio-net-cdev.h"
 #include "virtio-net.h"
+#include "eventfd_copy.h"
 
 /* Line size for reading maps file. */
 static const uint32_t BUFSIZE = PATH_MAX;
@@ -368,3 +373,51 @@ cuse_set_mem_table(struct vhost_device_ctx ctx,
 
        return 0;
 }
+
+/*
+ * Function to get the tap device name from the provided file descriptor and
+ * save it in the device structure.
+ */
+static int
+get_ifname(struct vhost_device_ctx ctx, struct virtio_net *dev, int tap_fd, int pid)
+{
+       int fd_tap;
+       struct ifreq ifr;
+       uint32_t ifr_size;
+       int ret;
+
+       fd_tap = eventfd_copy(tap_fd, pid);
+       if (fd_tap < 0)
+               return -1;
+
+       ret = ioctl(fd_tap, TUNGETIFF, &ifr);
+
+       if (close(fd_tap) < 0)
+               RTE_LOG(ERR, VHOST_CONFIG,
+                       "(%"PRIu64") fd close failed\n",
+                       dev->device_fh);
+
+       if (ret >= 0) {
+               ifr_size = strnlen(ifr.ifr_name, sizeof(ifr.ifr_name));
+               ops->set_ifname(ctx, ifr.ifr_name, ifr_size);
+       } else
+               RTE_LOG(ERR, VHOST_CONFIG,
+                       "(%"PRIu64") TUNGETIFF ioctl failed\n",
+                       dev->device_fh);
+
+       return 0;
+}
+
+int cuse_set_backend(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
+{
+       struct virtio_net *dev;
+
+       dev = get_device(ctx);
+       if (dev == NULL)
+               return -1;
+
+       if (!(dev->flags & VIRTIO_DEV_RUNNING) && file->fd != VIRTIO_DEV_STOPPED)
+               get_ifname(ctx, dev, file->fd, ctx.pid);
+
+       return ops->set_backend(ctx, file);
+}