ovs-ofctl: Clarify that tun_id will not be nonzero unless the key is nonzero

The Open vSwtich datapath's GRE implementation does not appear to make a
distinction between no key present and a zero key present, which appears to
be consistent with the (other) Linux implementation of GRE. Make this a
little clearer in the documentation.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Jesse Gross <jesse@nicira.com>

diff --git a/utilities/ovs-ofctl.8.in b/utilities/ovs-ofctl.8.in
index 1e85bc5..455298e 100644 (file)
--- a/utilities/ovs-ofctl.8.in
+++ b/utilities/ovs-ofctl.8.in
@@ -675,11 +675,11 @@ digits delimited by colons.
 .IP \fBtun_id=\fItunnel-id\fR[\fB/\fImask\fR]
 Matches tunnel identifier \fItunnel-id\fR.  Only packets that arrive
 over a tunnel that carries a key (e.g. GRE with the RFC 2890 key
-extension) will have a nonzero tunnel ID.  If \fImask\fR is omitted,
-\fItunnel-id\fR is the exact tunnel ID to match; if \fImask\fR is
-specified, then a 1-bit in \fImask\fR indicates that the corresponding
-bit in \fItunnel-id\fR must match exactly, and a 0-bit wildcards that
-bit.
+extension and a nonzero key value) will have a nonzero tunnel ID.
+If \fImask\fR is omitted, \fItunnel-id\fR is the exact tunnel ID to match;
+if \fImask\fR is specified, then a 1-bit in \fImask\fR indicates that the
+corresponding bit in \fItunnel-id\fR must match exactly, and a 0-bit
+wildcards that bit.
 .
 .IP "\fBreg\fIidx\fB=\fIvalue\fR[\fB/\fImask\fR]"
 Matches \fIvalue\fR either exactly or with optional \fImask\fR in