pf_ring: don't set cluster for DNA interface.

src/source-pfring.c

@@ -394,6 +394,9 @@ TmEcode ReceivePfringThreadInit(ThreadVars *tv, void *initdata, void **data) {
 
     ptv->cluster_id = pfconf->cluster_id;
 
+    if ((ptv->threads == 1) && (strncmp(ptv->interface, "dna", 3) == 0)) {
+        SCLogInfo("DNA interface detected, not adding thread to cluster");
+    } else {
 #ifdef HAVE_PFRING_CLUSTER_TYPE
         ptv->ctype = pfconf->ctype;
         rc = pfring_set_cluster(ptv->pd, ptv->cluster_id, ptv->ctype);
@@ -407,6 +410,7 @@ TmEcode ReceivePfringThreadInit(ThreadVars *tv, void *initdata, void **data) {
             pfconf->DerefFunc(pfconf);
             return TM_ECODE_FAILED;
         }
+    }
 
     if (ptv->threads > 1) {
         SCLogInfo("(%s) Using PF_RING v.%d.%d.%d, interface %s, cluster-id %d",