From da3827b5518ed6cd2256ba87eddd1c40bbca75f0 Mon Sep 17 00:00:00 2001
From: Justin Pettit <jpettit@nicira.com>
Date: Fri, 8 Oct 2010 14:18:28 -0700
Subject: [PATCH] netdev: Enforce a floor "linux-htb" min-rate

---
 lib/netdev-linux.c   | 4 ++--
 vswitchd/vswitch.xml | 3 ++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/netdev-linux.c b/lib/netdev-linux.c
index dfea605d8..06f739cdc 100644
--- a/lib/netdev-linux.c
+++ b/lib/netdev-linux.c
@@ -2415,13 +2415,13 @@ htb_parse_class_details__(struct netdev *netdev,
     const char *priority_s = shash_find_data(details, "priority");
     int mtu;
 
-    /* min-rate */
+    /* min-rate.  Don't allow a min-rate below 1500 bytes/s. */
     if (!min_rate_s) {
         /* min-rate is required. */
         return EINVAL;
     }
     hc->min_rate = strtoull(min_rate_s, NULL, 10) / 8;
-    hc->min_rate = MAX(hc->min_rate, 0);
+    hc->min_rate = MAX(hc->min_rate, 1500);
     hc->min_rate = MIN(hc->min_rate, htb->max_rate);
 
     /* max-rate */
diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
index 8b2221b83..bbe4af151 100644
--- a/vswitchd/vswitch.xml
+++ b/vswitchd/vswitch.xml
@@ -1042,7 +1042,8 @@
         column="type"/> of <code>min-rate</code> are:</p>
       <dl>
         <dt><code>min-rate</code></dt>
-        <dd>Minimum guaranteed bandwidth, in bit/s.  Required.</dd>
+        <dd>Minimum guaranteed bandwidth, in bit/s.  Required.  The
+          floor value is 1500 bytes/s (12,000 bit/s).</dd>
       </dl>
       <p>The key-value pairs defined for <ref table="QoS"/> <ref table="QoS"
         column="type"/> of <code>linux-htb</code> are:</p>
-- 
2.43.0