From: xdu2 <xdu2@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Thu, 1 Apr 2010 07:44:36 +0000 (+0000)
Subject: Enhance SNP to be compatible with UNDI driver which doesn’t report correct network... 
X-Git-Tag: edk2-stable201903~16011
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=553472f6447941f24bf9ae8c5ac54e04edf90dab

Enhance SNP to be compatible with UNDI driver which doesn’t report correct network cable status in Initialize(), i.e. force MediaPresent in Snp Mode to be TRUE in case UNDI driver report no media but actually we have already received packet from network interface.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10327 6f19259b-4bc3-4df7-8a09-765794883524
---

diff --git a/MdeModulePkg/Universal/Network/SnpDxe/Receive.c b/MdeModulePkg/Universal/Network/SnpDxe/Receive.c
index a37156aa0b..9d03499327 100644
--- a/MdeModulePkg/Universal/Network/SnpDxe/Receive.c
+++ b/MdeModulePkg/Universal/Network/SnpDxe/Receive.c
@@ -132,6 +132,16 @@ PxeReceive (
     *Protocol = (UINT16) PXE_SWAP_UINT16 (Db->Protocol);
   }
 
+  //
+  // We have received a packet from network interface, which implies that the
+  // network cable should be present. While, some UNDI driver may not report
+  // correct media status during Snp->Initialize(). So, we need ensure
+  // MediaPresent in SNP mode data is set to correct value.
+  //
+  if (Snp->Mode.MediaPresentSupported && !Snp->Mode.MediaPresent) {
+    Snp->Mode.MediaPresent = TRUE;
+  }
+
   return (*BufferSize <= BuffSize) ? EFI_SUCCESS : EFI_BUFFER_TOO_SMALL;
 }