From: Paul Durrant <paul.durrant@citrix.com>
Date: Mon, 7 Nov 2016 16:20:16 +0000 (+0000)
Subject: Avoid calculating a hash if it is not necessary
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=f5a1e85da7a6e7b17a1a3394a46d45b7a41d9d23;p=people%2Fpauldu%2Fxenvif.git

Avoid calculating a hash if it is not necessary

If there is only a single queue then we do not need to calculate a hash.
There is only one choice in how to steer the packet!

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
---

diff --git a/src/xenvif/transmitter.c b/src/xenvif/transmitter.c
index 175ea03..90b4008 100644
--- a/src/xenvif/transmitter.c
+++ b/src/xenvif/transmitter.c
@@ -5081,6 +5081,9 @@ __TransmitterHashPacket(
 
     Value = 0;
 
+    if (FrontendGetNumQueues(Frontend) == 1)
+        goto done;
+
     if (IpHeader->Version == 4) {
         PIPV4_HEADER    Version4 = &IpHeader->Version4;