Hello,
I'm working on an application that is using the UEFI networkstack to
communicate with a TFTP server.
That is working just fine on a mainboard with only one network interface.
But now I have a problem on a mainboard with two Intel network interfaces.
At first I'm doing something like that to decide on which interface a
network cable is attached:
// Locate all network device handles
Status = gBS->LocateHandleBuffer (ByProtocol,
&gEfiManagedNetworkServiceBindingProtocolGuid,
NULL, &HandleCount,
&Handles);
// Try to configure one of all handles
for (Index = 0; Index < HandleCount; Index++) {
// Get media status
GetNicMediaStatus (Handles[Index],
&TempNicInfo->MediaPresentSupported, &TempNicInfo->MediaPresent);
if (TempNicInfo->MediaPresent == 1) {
NicInfo->Handle = Handles[Index];
NicInfo->MediaPresentSupported =
TempNicInfo->MediaPresentSupported;
NicInfo->MediaPresent = TempNicInfo->MediaPresent;
InsertTailList (NicInfoList, &NicInfo->Link);
}
}
Depending on the MediaPresent-Flag I chose what NIC to use.
Later on in my source code I have to open the MTFTP4-protocol. I'm doing it
this way:
// Search available handles for MTFTP4 protocol
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiMtftp4ProtocolGuid,
NULL,
&HandleNum,
&HandleBuffer
);
// Chose the right protocol here
Status = gBS->OpenProtocol (
HandleBuffer[0], // Index 0
is hardcoded here. How can I chose which handle to use?
&gEfiMtftp4ProtocolGuid,
&This->Mtftp4,
This->ImageHandle,
NULL,
EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
);
As you can see right now I always chose HandleBuffer[0] although HandleNum
is returning that there are 2 handles available. Depending on where a
network cable is connected I must use Index '0' or '1'. But how can I
determine which one to use automatically?
Does the index number for the MTFTP4 protocol always match the index number
of the EfiManagedNetworkServiceBindingProtocol? Or is there a better way to
do this?
Regards,
Michael
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