a group of them can be used to reduce the number of flows required to
match on a range of transport ports. For example, suppose that the
goal is to match TCP source ports 1000 to 1999, inclusive. One way is
-to insert 1001 flows, each of which matches on a single source port.
+to insert 1000 flows, each of which matches on a single source port.
Another way is to look at the binary representations of 1000 and 1999,
as follows:
.br
ports.
.IP
Like the exact-match forms of \fBtp_src\fR and \fBtp_dst\fR described
-above, the bitwise match forms apply only when When \fBdl_type\fR and
+above, the bitwise match forms apply only when \fBdl_type\fR and
\fBnw_proto\fR specify TCP or UDP.
.
.IP \fBicmp_type=\fItype\fR
the \fBadd\-flow\fR and \fBadd\-flows\fR commands. For
\fBmod\-flows\fR and \fBdel\-flows\fR when \fB\-\-strict\fR is
specified, priority must match along with the rest of the flow
-specification. Other commands do not allow priority to be specified.
+specification. For \fBmod\-flows\fR without \fB\-\-strict\fR,
+priority is only significant if the command creates a new flow, that
+is, non-strict \fBmod\-flows\fR does not match on priority and will
+not change the priority of existing flows. Other commands do not
+allow priority to be specified.
.
.IP \fBpriority=\fIvalue\fR
The priority at which a wildcarded entry will match in comparison to
the flow's priority will default to 32768.
.
.PP
-The \fBadd\-flow\fR and \fBadd\-flows\fR commands support additional
-optional fields:
+The \fBadd\-flow\fR, \fBadd\-flows\fR, and \fBmod\-flows\fR commands
+support the following additional options. These options affect only
+new flows. Thus, for \fBadd\-flow\fR and \fBadd\-flows\fR, these
+options are always significant, but for \fBmod\-flows\fR they are
+significant only if the command creates a new flow, that is, their
+values do not update existing flows.
.
-.TP
-\fBidle_timeout=\fIseconds\fR
+.IP "\fBidle_timeout=\fIseconds\fR"
Causes the flow to expire after the given number of seconds of
-inactivity. A value of 0 (the default) prevents a flow from expiring due to
-inactivity.
+inactivity. A value of 0 (the default) prevents a flow from expiring
+due to inactivity.
.
.IP \fBhard_timeout=\fIseconds\fR
Causes the flow to expire after the given number of seconds,
.
The \fBdump\-tables\fR and \fBdump\-aggregate\fR commands print information
about the entries in a datapath's tables. Each line of output is a
-unique flow entry, which begins with some common information:
-.
-.IP \fBduration\fR
-The number of seconds the entry has been in the table.
+flow entry as described in \fBFlow Syntax\fR, above, plus some
+additional fields:
.
-.IP \fBtable\fR
-The table that contains the flow. When a packet arrives, the switch
-begins searching for an entry at the lowest numbered table. Tables are
-numbered as shown by the \fBdump\-tables\fR command.
-.
-.IP \fBpriority\fR
-The priority of the entry in relation to other entries within the same
-table. A higher value will match before a lower one.
+.IP \fBduration=\fIsecs\fR
+The time, in seconds, that the entry has been in the table.
+\fIsecs\fR includes as much precision as the switch provides, possibly
+to nanosecond resolution.
.
.IP \fBn_packets\fR
The number of packets that have matched the entry.
The total number of bytes from packets that have matched the entry.
.
.PP
-The rest of the line consists of a description of the flow entry as
-described in \fBFlow Syntax\fR, above.
-.
+The following additional fields are included only if the switch is
+Open vSwitch 1.6 or later and the NXM flow format is used to dump the
+flow (see the description of the \fB\-\-flow-format\fR option below).
+The values of these additional fields are approximations only and in
+particular \fBidle_age\fR will sometimes become nonzero even for busy
+flows.
+.
+.IP \fBhard_age=\fIsecs\fR
+The integer number of seconds since the flow was added or modified.
+\fBhard_age\fR is displayed only if it differs from the integer part
+of \fBduration\fR. (This is separate from \fBduration\fR because
+\fBmod\-flows\fR restarts the \fBhard_timeout\fR timer without zeroing
+\fBduration\fR.)
+.
+.IP \fBidle_age=\fIsecs\fR
+The integer number of seconds that have passed without any packets
+passing through the flow.
.
.SH OPTIONS
.TP
git://git.onelab.eu / sliver-openvswitch.git / blobdiff