[ovs-dev] [flood-vlans 3/3] ofproto-dpif: Restore former NORMAL action behavior when revalidating.

[Ben Pfaff]

Before commit fa066f015 "bridge: Move packet processing functionality into
ofproto," the code that called into what became xlate_normal() prevented
a flow from being installed if it was called at revalidation time and
the MAC learning table lacked an entry for the flow's destination MAC.
That commit instead started dropping packets in that case (because it
incorrectly ignored xlate_normal()'s return value).

This restores the former behavior.  It's not clear that the former behavior
is the best possible, but it is strictly better than starting to drop
packets at revalidation time.

Along with the previously fixed problem where flood_vlans were interpreted
incorrectly, this bug broke controller connectivity when flood_vlans was
set to any nonempty value that did not include the VLAN used for the
controller connection (that is, when flood_vlans was interpreted as
flooding the controller VLAN).

Reported-by: David Tsai <dtsai at nicira.com>
---
 ofproto/ofproto-dpif.c |   12 ++++--------
 1 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/ofproto/ofproto-dpif.c b/ofproto/ofproto-dpif.c
index 2b1d5e4..9541750 100644
--- a/ofproto/ofproto-dpif.c
+++ b/ofproto/ofproto-dpif.c
@@ -2784,7 +2784,7 @@ send_packet(struct ofproto_dpif *ofproto, uint32_t odp_port,
 
 static void do_xlate_actions(const union ofp_action *in, size_t n_in,
                              struct action_xlate_ctx *ctx);
-static bool xlate_normal(struct action_xlate_ctx *);
+static void xlate_normal(struct action_xlate_ctx *);
 
 static void
 commit_odp_actions(struct action_xlate_ctx *ctx)
@@ -3766,10 +3766,7 @@ is_admissible(struct ofproto_dpif *ofproto, const struct flow *flow,
     return true;
 }
 
-/* If the composed actions may be applied to any packet in the given 'flow',
- * returns true.  Otherwise, the actions should only be applied to 'packet', or
- * not at all, if 'packet' was NULL. */
-static bool
+static void
 xlate_normal(struct action_xlate_ctx *ctx)
 {
     struct ofbundle *in_bundle;
@@ -3800,7 +3797,8 @@ xlate_normal(struct action_xlate_ctx *ctx)
          * of time where we could learn from a packet reflected on a bond and
          * blackhole packets before the learning table is updated to reflect
          * the correct port. */
-        return false;
+        ctx->may_set_up_flow = false;
+        return;
     } else {
         out_bundle = OFBUNDLE_FLOOD;
     }
@@ -3814,8 +3812,6 @@ done:
     if (in_bundle) {
         compose_actions(ctx, vlan, in_bundle, out_bundle);
     }
-
-    return true;
 }
 
 static bool
-- 
1.7.4.4