X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fdpif.c;h=097b38d8c22aa7eeaf359d4912bb2d20995cceb9;hb=a6bc4a03a44ee8a4ab346f0c1a6e21d20a1d29bd;hp=315f11f9dd72c078f078d79deedb1a41a165d759;hpb=a0bc29a541fc7dc6e20137d5558e2094d614e6ab;p=openvswitch

diff --git a/lib/dpif.c b/lib/dpif.c
index 315f11f9..097b38d8 100644
--- a/lib/dpif.c
+++ b/lib/dpif.c
@@ -58,7 +58,7 @@ static struct shash dpif_classes = SHASH_INITIALIZER(&dpif_classes);
 static struct vlog_rate_limit dpmsg_rl = VLOG_RATE_LIMIT_INIT(600, 600);
 
 /* Not really much point in logging many dpif errors. */
-static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
+static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(60, 5);
 
 static void log_operation(const struct dpif *, const char *operation,
                           int error);
@@ -724,6 +724,11 @@ dpif_flow_get(const struct dpif *dpif, struct odp_flow *flow)
     if (!error) {
         error = flow->stats.error;
     }
+    if (error) {
+        /* Make the results predictable on error. */
+        memset(&flow->stats, 0, sizeof flow->stats);
+        flow->n_actions = 0;
+    }
     if (should_log_flow_message(error)) {
         log_flow_operation(dpif, "flow_get", error, flow);
     }
@@ -1010,7 +1015,8 @@ dpif_set_sflow_probability(struct dpif *dpif, uint32_t probability)
 
 /* Attempts to receive a message from 'dpif'.  If successful, stores the
  * message into '*packetp'.  The message, if one is received, will begin with
- * 'struct odp_msg' as a header.  Only messages of the types selected with
+ * 'struct odp_msg' as a header, and will have at least DPIF_RECV_MSG_PADDING
+ * bytes of headroom.  Only messages of the types selected with
  * dpif_set_listen_mask() will ordinarily be received (but if a message type is
  * enabled and then later disabled, some stragglers might pop up).
  *
@@ -1021,8 +1027,10 @@ dpif_recv(struct dpif *dpif, struct ofpbuf **packetp)
 {
     int error = dpif->dpif_class->recv(dpif, packetp);
     if (!error) {
+        struct ofpbuf *buf = *packetp;
+
+        assert(ofpbuf_headroom(buf) >= DPIF_RECV_MSG_PADDING);
         if (VLOG_IS_DBG_ENABLED()) {
-            struct ofpbuf *buf = *packetp;
             struct odp_msg *msg = buf->data;
             void *payload = msg + 1;
             size_t payload_len = buf->size - sizeof *msg;