[ovs-dev] [PATCH 2/3] netdev-linux: make tap devices persistent.

Flavio Leitner fbl at redhat.com
Mon May 29 19:40:22 UTC 2017


When using data path type "netdev", bridge port is a tun device
and when OVS restarts, that device and its network configuration
is lost.

This patch enables the tap device to persist instead.

Signed-off-by: Flavio Leitner <fbl at redhat.com>
---
 lib/netdev-linux.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/netdev-linux.c b/lib/netdev-linux.c
index 3ad3d45..d181e4f 100644
--- a/lib/netdev-linux.c
+++ b/lib/netdev-linux.c
@@ -866,6 +866,13 @@ netdev_linux_construct_tap(struct netdev *netdev_)
         goto error_close;
     }
 
+    if (ioctl(netdev->tap_fd, TUNSETPERSIST, 1)) {
+        VLOG_WARN("%s: creating tap device failed (persist): %s", name,
+                  ovs_strerror(errno));
+        error = errno;
+        goto error_close;
+    }
+
     return 0;
 
 error_close:
@@ -885,6 +892,7 @@ netdev_linux_destruct(struct netdev *netdev_)
     if (netdev_get_class(netdev_) == &netdev_tap_class
         && netdev->tap_fd >= 0)
     {
+        ioctl(netdev->tap_fd, TUNSETPERSIST, 0);
         close(netdev->tap_fd);
     }
 
-- 
2.9.4



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