ovs: Implement 802.1ag Connectivity Fault Management

This commit implements a subset of the 802.1ag specification for
Connectivity Fault Management (CFM) using Continuity Check Messages
(CCM).  When CFM is configured on an interface CCMs are broadcast
at regular intervals to detect missing or unexpected connectivity.

1 files changed, 97 insertions, 0 deletions

diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
index dd6fce7cf..bec2d58e8 100644
--- a/vswitchd/vswitch.xml
+++ b/vswitchd/vswitch.xml
@@ -892,6 +892,11 @@
     </group>
 
     <group title="Other Features">
+
+      <column name="monitor">
+        Connectivity monitor configuration for this interface.
+      </column>
+
       <column name="external_ids">
         Key-value pairs for use by external frameworks that integrate
         with Open vSwitch, rather than by Open vSwitch itself.  System
@@ -1140,6 +1145,98 @@
     </column>
   </table>
 
+  <table name="Monitor" title="Connectivity Monitor configuration">
+    <p>
+      A <ref table="Monitor"/> attaches to an <ref table="Interface"/> to
+      implement 802.1ag Connectivity Fault Management (CFM).  CFM allows a
+      group of Maintenance Points (MPs) called a Maintenance Association (MA)
+      to detect connectivity problems with each other.  MPs within a MA should
+      have complete and exclusive interconnectivity.  This is verified by
+      occasionally broadcasting Continuity Check Messages (CCMs) at a
+      configurable transmission interval.  A <ref table="Monitor"/> is
+      responsible for collecting data about other MPs in its MA and
+      broadcasting CCMs.
+    </p>
+
+    <group title="Monitor Configuration">
+      <column name="mpid">
+        A Maintenance Point ID (MPID) uniquely identifies each endpoint within
+        a Maintenance Association (see <ref column="ma_name"/>).  The MPID is
+        used to identify this <ref table="Monitor"/> to other endpoints in the
+        MA.
+      </column>
+
+      <column name="remote_mps">
+        A set of <ref table="Maintenance_Points"/> which this
+        <ref table="Monitor"/> should have connectivity to.  If this
+        <ref table="Monitor"/> does not have connectivity to any MPs in this
+        set, or has connectivity to any MPs not in this set, a fault is
+        signaled.
+      </column>
+
+      <column name="ma_name">
+        A Maintenance Association (MA) name pairs with a Maintenance Domain
+        (MD) name to uniquely identify a MA.  A MA is a group of endpoints who
+        have complete and exclusive interconnectivity. Defaults to
+        <code>ovs</code> if unset.
+      </column>
+
+      <column name="md_name">
+        A Maintenance Domain name pairs with a Maintenance Association name to
+        uniquely identify a MA. Defaults to <code>ovs</code> if unset.
+      </column>
+
+      <column name="interval">
+        The transmission interval of CCMs in milliseconds.  Three missed CCMs
+        indicate a connectivity fault.  Defaults to 1000ms.
+      </column>
+    </group>
+
+    <group title="Monitor Status">
+      <column name="unexpected_remote_mpids">
+        A set of MPIDs representing MPs to which this <ref table="Monitor"/>
+        has detected connectivity that are not in the
+        <ref column="remote_mps"/> set.  This <ref table="Monitor"/> should not
+        have connectivity to any MPs not listed in <ref column="remote_mps"/>.
+        Thus, if this set is non-empty a fault is indicated.
+      </column>
+
+      <column name="unexpected_remote_maids">
+        A set of MAIDs representing foreign Maintenance Associations (MAs)
+        which this <ref table="Monitor"/> has detected connectivity to. A
+        <ref table="Monitor"/> should not have connectivity to a Maintenance
+        Association other than its own.  Thus, if this set is non-empty a fault
+        is indicated.
+      </column>
+
+      <column name="fault">
+        Indicates a Connectivity Fault caused by a configuration error, a down
+        remote MP, or unexpected connectivity to a remote MAID or remote MP.
+      </column>
+    </group>
+  </table>
+
+  <table name="Maintenance_Point" title="Maintenance Point configuration">
+    <p>
+      A <ref table="Maintenance_Point"/> represents a MP which a
+      <ref table="Monitor"/> has or should have connectivity to.
+    </p>
+
+    <group title="Maintenance_Point Configuration">
+      <column name="mpid">
+        A Maintenance Point ID (MPID) uniquely identifies each endpoint within
+        a Maintenance Association. All MPs within a MA should have a unique
+        MPID.
+      </column>
+    </group>
+
+    <group title="Maintenance_Point Status">
+      <column name="fault">
+        Indicates a connectivity fault.
+      </column>
+    </group>
+  </table>
+
   <table name="Mirror" title="Port mirroring (SPAN/RSPAN).">
     <p>A port mirror within a <ref table="Bridge"/>.</p>
     <p>A port mirror configures a bridge to send selected frames to special