From: Aleksey Katargin <gureedo@gmail.com>
Date: Thu, 16 Jul 2015 13:51:03 +0000 (+0500)
Subject: netmap: strict check for zero copy mode
X-Git-Tag: suricata-3.0RC1~251
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=823167bde2d805b7a089c3ea0c69ee0bc2ff4d64;p=thirdparty%2Fsuricata.git

netmap: strict check for zero copy mode
Netmap does not guarantees that mmap'ed regions for different interfaces would be the same.
---

diff --git a/src/source-netmap.c b/src/source-netmap.c
index 7d56e623b9..b00dd43b75 100644
--- a/src/source-netmap.c
+++ b/src/source-netmap.c
@@ -578,8 +578,15 @@ static TmEcode ReceiveNetmapThreadInit(ThreadVars *tv, void *initdata, void **da
 
     char const *active_runmode = RunmodeGetActive();
     if (active_runmode && !strcmp("workers", active_runmode)) {
-        ntv->flags |= NETMAP_FLAG_ZERO_COPY;
-        SCLogInfo("Enabling zero copy mode");
+        if (likely(ntv->ifsrc->mem == ntv->ifdst->mem)) {
+            ntv->flags |= NETMAP_FLAG_ZERO_COPY;
+            SCLogInfo("Enabling zero copy mode for %s->%s",
+                      aconf->iface, aconf->out_iface);
+        } else {
+            SCLogInfo("Unable to set zero copy mode for %s->%s",
+                      aconf->iface, aconf->out_iface);
+        }
+
     }
 
     if (aconf->bpf_filter) {