Add support for OpenFlow 1.4+ "importance" values.

This patch enables a user to set importance for a new rule via add-flow
OF1.4+ in the OVS and display the same via dump-flows command OF1.4+.
The changes are made in accordance with OpenFlow 1.4 specs to implement
eviction on the basis of "importance".  This patch also enhances the
diff-flows & replace-flows CLI for addition of importance parameter in
a rule.

This doesn't actually implement eviction on the basis of importance, which
will happen in a later patch.

Signed-off-by: Rishi Bamba <rishi.bamba@tcs.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/utilities/ovs-ofctl.8.in b/utilities/ovs-ofctl.8.in
index b8d41fbe5..0fe2bd4d0 100644
--- a/utilities/ovs-ofctl.8.in
+++ b/utilities/ovs-ofctl.8.in
@@ -1847,6 +1847,14 @@ Causes the flow to expire after the given number of seconds,
 regardless of activity.  A value of 0 (the default) gives the flow no
 hard expiration deadline.
 .
+.IP "\fBimportance=\fIvalue\fR"
+Sets the importance of a flow.  The flow entry eviction mechanism can
+use importance as a factor in deciding which flow to evict.  A value
+of 0 (the default) makes the flow non-evictable on the basis of
+importance.  Specify a value between 0 and 65535.
+.IP
+Only OpenFlow 1.4 and later support \fBimportance\fR.
+.
 .IP "\fBsend_flow_rem\fR"
 Marks the flow with a flag that causes the switch to generate a ``flow
 removed'' message and send it to interested controllers when the flow