From: Ben Pfaff <blp@nicira.com>
Date: Thu, 19 Mar 2009 18:16:29 +0000 (-0700)
Subject: vswitch: Add rate-limiting support.
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7975e9cf145a97b0eeb717841bae845a0bb20a63;p=openvswitch

vswitch: Add rate-limiting support.
---

diff --git a/vswitchd/bridge.c b/vswitchd/bridge.c
index 35093fab..204e2596 100644
--- a/vswitchd/bridge.c
+++ b/vswitchd/bridge.c
@@ -854,6 +854,7 @@ bridge_reconfigure_one(struct bridge *br)
     if (ctl && strlen(ctl) != 0) {
         const char *fail_mode;
         int max_backoff, probe;
+        int rate_limit, burst_limit;
 
         if (!strcmp(ctl, "discover")) {
             ofproto_set_discovery(br->ofproto, true,
@@ -919,6 +920,17 @@ bridge_reconfigure_one(struct bridge *br)
         }
         ofproto_set_max_backoff(br->ofproto, max_backoff);
 
+        rate_limit = cfg_get_int(0, "%s.rate-limit", pfx);
+        if (!rate_limit) {
+            rate_limit = cfg_get_int(0, "mgmt.rate-limit");
+        }
+        burst_limit = cfg_get_int(0, "%s.burst-limit", pfx);
+        if (!burst_limit) {
+            burst_limit = cfg_get_int(0, "mgmt.burst-limit");
+        }
+        printf("rate_limit=%d burst_limit=%d\n", rate_limit, burst_limit);
+        ofproto_set_rate_limit(br->ofproto, rate_limit, burst_limit);
+
         ofproto_set_stp(br->ofproto, cfg_get_bool(0, "%s.stp", pfx));
 
         if (cfg_has("%s.commands.acl", pfx)) {
diff --git a/vswitchd/vswitchd.conf.5.in b/vswitchd/vswitchd.conf.5.in
index 766f3a70..b9127eb5 100644
--- a/vswitchd/vswitchd.conf.5.in
+++ b/vswitchd/vswitchd.conf.5.in
@@ -2,12 +2,17 @@
 .de TQ
 .  br
 .  ns
-.  TP \$1
+.  TP "\\$1"
+..
+.de IQ
+.  br
+.  ns
+.  IP "\\$1"
 ..
 .de ST
 .  PP
 .  RS -0.15in
-.  I \\$1
+.  I "\\$1"
 .  RE
 .  PP
 ..
@@ -524,6 +529,29 @@ Sets the maximum time between attempts to connect to the controller to
 connection attempts starts at 1 second and doubles on each failing
 attempt until it reaches the maximum.  The default maximum backoff
 time is taken from \fBmgmt.max-backoff\fR.
+.ST "Rate Limit Settings"
+These settings configure how the virtual switch applies a ``token
+bucket'' to limit the rate at which packets in unknown flows are
+forwarded to the OpenFlow controller for flow-setup processing.  This
+feature prevents a single bridge from overwhelming a controller.
+.IP "\fBbridge.\fIname\fB.controller.rate-limit = \fIrate\fR"
+.IQ "\fBmgmt.rate-limit = \fIrate\fR"
+Limits the maximum rate at which packets will be forwarded to the
+OpenFlow controller to \fIrate\fR packets per second.  The first of
+these that is set takes effect.
+.IP
+If neither one of these settings is set, then the bridge does not
+limit the rate at which packets are forwarded to the controller.
+.IP "\fBbridge.\fIname\fB.controller.burst-limit = \fIburst\fR"
+.IQ "\fBmgmt.burst-limit = \fIburst\fR"
+Sets the maximum number of unused packet credits that the bridge will
+allow to accumulate during time in which no packets are being
+forwarded to the OpenFlow controller to \fIburst\fR (measured in
+packets).  The default \fIburst\fR is one-quarter of the \fIrate\fR
+specified in the rate limit setting.
+.IP
+The first of these that is set takes effect.  This option takes effect
+only when a rate limit is specified.
 .ST "Remote Command Execution Settings"
 These settings configure the commands that remote OpenFlow connections
 are allowed to invoke using (e.g.) \fBdpctl execute\fR.  To be