[NET] back: Advertise that we do not support rx-flip path any more.

This will now be used only by older guests who do not understand
the feature-rx-{copy,flip} feature flags.
Signed-off-by: Keir Fraser <keir@xensource.com>

diff --git a/linux-2.6-xen-sparse/drivers/xen/netback/xenbus.c b/linux-2.6-xen-sparse/drivers/xen/netback/xenbus.c
index b81042d701db0f1094ffd664ae890652703d28e5..7d301965f4e7dd0612825c08e66196df7dbc0b69 100644 (file)
--- a/linux-2.6-xen-sparse/drivers/xen/netback/xenbus.c
+++ b/linux-2.6-xen-sparse/drivers/xen/netback/xenbus.c
@@ -93,10 +93,22 @@ static int netback_probe(struct xenbus_device *dev,
                        goto abort_transaction;
                }
 
+               /* We support rx-copy path. */
                err = xenbus_printf(xbt, dev->nodename,
                                    "feature-rx-copy", "%d", 1);
                if (err) {
-                       message = "writing feature-copying";
+                       message = "writing feature-rx-copy";
+                       goto abort_transaction;
+               }
+
+               /*
+                * We don't support rx-flip path (except old guests who don't
+                * grok this feature flag).
+                */
+               err = xenbus_printf(xbt, dev->nodename,
+                                   "feature-rx-flip", "%d", 0);
+               if (err) {
+                       message = "writing feature-rx-flip";
                        goto abort_transaction;
                }