Hello all,
I have an issue in my NetworkDirect RDMA application when loading the Mellanox
NDv2 provider. It seems as the newer WinOF-2 driver for ConnectX-4 IB HCAs
(mlx5nd.dll) requires that the connecting process has adminstrator privileges.
Because when running my application with normal user privileges, I get an error
0x80070005 (Access denied), whereas this has never been an issue with the older
WinOF driver for ConnectX-3 HCAs (mlx4nd.dll).
Here the failing code sequence from my ndhelper.cpp:
static HMODULE g_hProvider = NULL;
static IND2Provider g_pIProvider = NULL;
static HRESULT LoadProvider( __in WSAPROTOCOL_INFOW* pProtocol )
{
WCHAR* pPath = ::GetProviderPath( pProtocol ); //
%SystemRoot%\System32\mlx5nd.dll
g_hProvider = ::LoadLibraryW( pPath );
::HeapFree( ::GetProcessHeap(), 0, pPath );
DLLGETCLASSOBJECT pfnDllGetClassObject =
reinterpret_cast<DLLGETCLASSOBJECT>(
::GetProcAddress( g_hProvider, "DllGetClassObject" )
);
DLLGETCLASSOBJECT pfnDllCanUnloadNow = reinterpret_cast<DLLCANUNLOADNOW>(
::GetProcAddress(g_hProvider, "DllCanUnloadNow")
);
IClassFactory* pClassFactory;
HRESULT hr = pfnDllGetClassObject(
pProtocol->ProviderId,
IID_IClassFactory,
reinterpret_cast<void**>(&pClassFactory)
);
if (g_pIProvider == NULL) {
hr = pClassFactory->CreateInstance(
NULL,
IID_IND2Provider,
reinterpret_cast<void**>(&g_pIProvider)
);
if (FAILED(hr)) {
TRACE("ClassFactory->CreateInstance(IID_IND2Provider) failed with
error 0x%08X", hr); // Without having admin rights, always ending up here!
g_pIProvider = NULL;
}
pClassFactory->Release();
}
}
Unfortunately, just giving my process admin privileges is not an option for me.
So I would appreciate if someone has an idea how to overcome this issue.
Perhaps some tuning of security configuration via dcomcnfg or the like(?)
BTW: The Mellanox-provided tools nd_read_bw.exe and nd_write_bw.exe have the
same behavior:
* Those from WinOF driver 5.35 on ConnectX-3 FDR HCA can run WITH or
WITHOUT admin privileges.
* Those from WinOF-2 driver 1.80 on ConnectX-4 EDR HCA can run only WITH
admin privileges.
My system configuration:
* HPE DL380Gen10
* ConnectX-4 EDR Infiniband HCA (HPEIB EDR/EN 100Gb 2P 840QSFP28)
* Windows Server 2012 R2
* Mellanox WinOF-2 version 1.80
Thanks and Regards,
Hubert
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