From 779ae3579848a36319d67a6ba012b4b9aa88aa6b Mon Sep 17 00:00:00 2001
From: xdu2 <xdu2@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Wed, 30 Dec 2009 13:47:55 +0000
Subject: Add VLAN support.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9649 6f19259b-4bc3-4df7-8a09-765794883524
---
 MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'MdeModulePkg/Universal/Network/Ip4Dxe')

diff --git a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c
index 1b7fa4e603..5e297821a2 100644
--- a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c
+++ b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c
@@ -291,6 +291,12 @@ Ip4CreateService (
   InsertHeadList (&IpSb->Interfaces, &IpSb->DefaultInterface->Link);
 
   IpSb->MaxPacketSize = IpSb->SnpMode.MaxPacketSize - sizeof (IP4_HEAD);
+  if (NetLibGetVlanId (IpSb->Controller) != 0) {
+    //
+    // This is a VLAN device, reduce MTU by VLAN tag length
+    //
+    IpSb->MaxPacketSize -= NET_VLAN_TAG_LEN;
+  }
   IpSb->MacString = NULL;
 
   *Service = IpSb;
-- 
cgit v1.2.3