From: Paul Durrant <paul.durrant@citrix.com>
Date: Wed, 17 Aug 2016 10:22:29 +0000 (+0100)
Subject: Remove update of defunct statistic
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=50aa36a8ac5ac7907b73d6ecbe98fbcebea108fc;p=people%2Fpauldu%2Fxennet.git

Remove update of defunct statistic

Nothing looks a the 'InNDISMax' value, yet the receiver code still jumps
through potentially performance damaging hoops to update it. This patch
finally blows it away.

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

diff --git a/src/xennet/receiver.c b/src/xennet/receiver.c
index ba05799..693d1ac 100644
--- a/src/xennet/receiver.c
+++ b/src/xennet/receiver.c
@@ -46,7 +46,6 @@ struct _XENNET_RECEIVER {
     PNET_BUFFER_LIST            PutList;
     PNET_BUFFER_LIST            GetList[HVM_MAX_VCPUS];
     LONG                        InNDIS;
-    LONG                        InNDISMax;
     XENVIF_VIF_OFFLOAD_OPTIONS  OffloadOptions;
 };
 
@@ -287,19 +286,6 @@ __ReceiverPushPacket(
     if (InNDIS > IN_NDIS_MAX)
         Flags |= NDIS_RECEIVE_FLAGS_RESOURCES;
 
-    for (;;) {
-        LONG    InNDISMax;
-
-        InNDISMax = Receiver->InNDISMax;
-        KeMemoryBarrier();
-
-        if (InNDIS <= InNDISMax)
-            break;
-
-        if (InterlockedCompareExchange(&Receiver->InNDISMax, InNDIS, InNDISMax) == InNDISMax)
-            break;
-    }
-
     NdisMIndicateReceiveNetBufferLists(AdapterGetHandle(Receiver->Adapter),
                                        NetBufferList,
                                        NDIS_DEFAULT_PORT_NUMBER,