ovs-controller: Add --wildcard and --normal features.

This adds two command line switches to ovs-controller to:
	1) Use wildcards instead of exact matches.
	2) Use "normal" action instead of explicit port.

lib/learning-switch.c

@@ -57,6 +57,8 @@ struct lswitch {
     uint32_t capabilities;
     time_t last_features_request;
     struct mac_learning *ml;    /* NULL to act as hub instead of switch. */
+    bool exact_flows;           /* Use exact-match flows? */
+    bool action_normal;         /* Use OFPP_NORMAL? */
 
     /* Number of outgoing queued packets on the rconn. */
     struct rconn_packet_counter *queued;
@@ -105,7 +107,8 @@ static packet_handler_func process_stats_reply;
  *
  * 'rconn' is used to send out an OpenFlow features request. */
 struct lswitch *
-lswitch_create(struct rconn *rconn, bool learn_macs, int max_idle)
+lswitch_create(struct rconn *rconn, bool learn_macs,
+	       bool exact_flows, int max_idle, bool action_normal)
 {
     struct lswitch *sw;
     size_t i;
@@ -115,6 +118,8 @@ lswitch_create(struct rconn *rconn, bool learn_macs, int max_idle)
     sw->datapath_id = 0;
     sw->last_features_request = time_now() - 1;
     sw->ml = learn_macs ? mac_learning_create() : NULL;
+    sw->action_normal = action_normal;
+    sw->exact_flows = exact_flows;
     sw->queued = rconn_packet_counter_create();
     sw->next_query = LLONG_MIN;
     sw->last_query = LLONG_MIN;
@@ -430,20 +435,50 @@ process_packet_in(struct lswitch *sw, struct rconn *rconn, void *opi_)
         /* Don't send out packets on their input ports. */
         goto drop_it;
     } else if (sw->max_idle >= 0 && (!sw->ml || out_port != OFPP_FLOOD)) {
+        struct ofpbuf *buffer;
+        struct ofp_flow_mod *ofm;
+        uint32_t wildcards;
+
+        /* Check if we need to wildcard the flows. */
+        if (!sw->exact_flows) {
+            /* We can not wildcard all fields.
+             * We need in_port to detect moves.
+             * We need both SA and DA to do learning. */
+            wildcards = (OFPFW_DL_TYPE | OFPFW_NW_SRC_MASK | OFPFW_NW_DST_MASK
+                         | OFPFW_NW_PROTO | OFPFW_TP_SRC | OFPFW_TP_DST);
+        } else {
+            /* Exact match */
+            wildcards = 0;
+        }
+
+        /* Check if we need to use "NORMAL" action. */
+        if (sw->action_normal && out_port != OFPP_FLOOD) {
+            out_port = OFPP_NORMAL;
+        }
+
         /* The output port is known, or we always flood everything, so add a
          * new flow. */
-        queue_tx(sw, rconn, make_add_simple_flow(&flow, ntohl(opi->buffer_id),
-                                                 out_port, sw->max_idle));
+        buffer = make_add_simple_flow(&flow, ntohl(opi->buffer_id),
+                                      out_port, sw->max_idle);
+        ofm = buffer->data;
+        ofm->match.wildcards = htonl(wildcards);
+        queue_tx(sw, rconn, buffer);
 
         /* If the switch didn't buffer the packet, we need to send a copy. */
         if (ntohl(opi->buffer_id) == UINT32_MAX) {
             queue_tx(sw, rconn,
                      make_unbuffered_packet_out(&pkt, in_port, out_port));
         }
     } else {
+        struct ofpbuf *b;
+
+        /* Check if we need to use "NORMAL" action. */
+        if (sw->action_normal && out_port != OFPP_FLOOD) {
+            out_port = OFPP_NORMAL;
+        }
+
         /* We don't know that MAC, or we don't set up flows.  Send along the
          * packet without setting up a flow. */
-        struct ofpbuf *b;
         if (ntohl(opi->buffer_id) == UINT32_MAX) {
             b = make_unbuffered_packet_out(&pkt, in_port, out_port);
         } else {

lib/learning-switch.h

@@ -22,7 +22,9 @@
 struct ofpbuf;
 struct rconn;
 
-struct lswitch *lswitch_create(struct rconn *, bool learn_macs, int max_idle);
+struct lswitch *lswitch_create(struct rconn *, bool learn_macs,
+			       bool exact_flows, int max_idle,
+			       bool action_normal);
 void lswitch_run(struct lswitch *, struct rconn *);
 void lswitch_wait(struct lswitch *);
 void lswitch_destroy(struct lswitch *);

utilities/ovs-controller.8.in

@@ -118,7 +118,24 @@ through the controller and every packet is flooded.
 
 This option is most useful for debugging.  It reduces switching
 performance, so it should not be used in production.
-
+.
+.IP "\fB-w\fR, \fB--wildcard\fR"
+By default, \fBovs\-controller\fR sets up exact-match flows.  This
+option allows it to set up wildcarded flows, which may reduce
+flow-setup latency by causing less traffic to be sent up to the
+controller.
+.IP
+This option has no effect when \fB-n\fR (or \fB--noflow\fR) is in use
+(because the controller does not set up flows in that case).
+.
+.IP "\fB-N\fR, \fB--normal\fR"
+By default, \fBovs\-controller\fR directs packets to a particular port
+or floods them.  This option causes it to direct non-flooded packets
+to the OpenFlow \fBOFPP_NORMAL\fR port.  This allows the switch itself
+to make decisions about packet destinations.  Support for
+\fBOFPP_NORMAL\fR is optional in OpenFlow, so this option may not well
+with some non-Open vSwitch switches.
+.
 .IP "\fB--mute\fR"
 Prevents ovs\-controller from replying to any OpenFlow messages sent
 to it by switches.

utilities/ovs-controller.c

@@ -55,6 +55,12 @@ static bool learn_macs = true;
 /* Set up flows?  (If not, every packet is processed at the controller.) */
 static bool set_up_flows = true;
 
+/* -N, --normal: Use "NORMAL" action instead of explicit port? */
+static bool action_normal = false;
+
+/* -w, --wildcard: Set up exact match or wildcard flow entries? */
+static bool exact_flows = true;
+
 /* --max-idle: Maximum idle time, in seconds, before flows expire. */
 static int max_idle = 60;
 
@@ -201,8 +207,9 @@ static void
 new_switch(struct switch_ *sw, struct vconn *vconn, const char *name)
 {
     sw->rconn = rconn_new_from_vconn(name, vconn);
-    sw->lswitch = lswitch_create(sw->rconn, learn_macs,
-                                 set_up_flows ? max_idle : -1);
+    sw->lswitch = lswitch_create(sw->rconn, learn_macs, exact_flows,
+                                 set_up_flows ? max_idle : -1,
+                                 action_normal);
 }
 
 static int
@@ -239,6 +246,8 @@ parse_options(int argc, char *argv[])
     static struct option long_options[] = {
         {"hub",         no_argument, 0, 'H'},
         {"noflow",      no_argument, 0, 'n'},
+        {"normal",      no_argument, 0, 'N'},
+        {"wildcard",    no_argument, 0, 'w'},
         {"max-idle",    required_argument, 0, OPT_MAX_IDLE},
         {"mute",        no_argument, 0, OPT_MUTE},
         {"help",        no_argument, 0, 'h'},
@@ -275,6 +284,14 @@ parse_options(int argc, char *argv[])
             mute = true;
             break;
 
+        case 'N':
+            action_normal = true;
+            break;
+
+        case 'w':
+            exact_flows = false;
+            break;
+
         case OPT_MAX_IDLE:
             if (!strcmp(optarg, "permanent")) {
                 max_idle = OFP_FLOW_PERMANENT;
@@ -329,6 +346,8 @@ usage(void)
            "  -H, --hub               act as hub instead of learning switch\n"
            "  -n, --noflow            pass traffic, but don't add flows\n"
            "  --max-idle=SECS         max idle time for new flows\n"
+           "  -N, --normal            use OFPAT_NORMAL action\n"
+           "  -w, --wildcard          use wildcards, not exact-match rules\n"
            "  -h, --help              display this help message\n"
            "  -V, --version           display version information\n");
     exit(EXIT_SUCCESS);