VOID
MPReturnNetBufferLists(
NDIS_HANDLE MiniportAdapterContext,
PNET_BUFFER_LIST NetBufferLists,
ULONG ReturnFlags
)
{
PADAPTER adapter = (PADAPTER)MiniportAdapterContext;
PMP_PORT destinationPort = NULL;
PNET_BUFFER_LIST currentNetBufferList = NetBufferLists, nextNetBufferList;
//
// We increment the port list refcount. This would avoid a pause from finishing
// while we are processing this NBL and that ensures that the port list does not
// change
//
MP_INCREMENT_PORTLIST_REFCOUNT(adapter);
//
// Walk the chain of netbuffer lists
//
while (currentNetBufferList != NULL)
{
//
// Currently we return 1 NET_BUFFER_LIST at a time since we may be getting
// back NET_BUFFER_LISTS indicated by different ports on 1 call.
// This can be optimized
//
nextNetBufferList = NET_BUFFER_LIST_NEXT_NBL(currentNetBufferList);
NET_BUFFER_LIST_NEXT_NBL(currentNetBufferList) = NULL;
destinationPort = MP_NBL_SOURCE_PORT(currentNetBufferList);
MPASSERT(destinationPort != NULL);
//
// Pass it to the appropriate port for processing
//
Port11HandleReturnNetBufferLists(
destinationPort,
currentNetBufferList,
ReturnFlags
);
currentNetBufferList = nextNetBufferList;
}
//
// We were protecting the port list only until we hand it to the port. After this point, the port
// is responsible for ensuring that it does not let the port get deleted while
// it has packets pending on it
//
MP_DECREMENT_PORTLIST_REFCOUNT(adapter);
}
NDIS_STATUS
BasePortTranslateRxPacketsToRxNBLs(
__in PMP_PORT Port,
__in PMP_RX_MSDU PacketList,
__out PNET_BUFFER_LIST* NetBufferLists
)
{
PNET_BUFFER_LIST outputNetBufferList = NULL;
PNET_BUFFER_LIST currentNetBufferList, prevNetBufferList = NULL;
USHORT fragmentIndex = 0;
PMP_RX_MSDU currentPacket = PacketList, nextPacket;
PMP_RX_MPDU currentFragment;
NDIS_STATUS ndisStatus = NDIS_STATUS_SUCCESS;
PDOT11_EXTSTA_RECV_CONTEXT osRecvContext; // This is same for ExtAP & ExtSTA
PMDL currentMdl, prevMdl = NULL, mdlChain = NULL;
ULONG totalLength = 0;
*NetBufferLists = NULL;
// Convert each PACKET and FRAGMENT to OS structures
while (currentPacket != NULL)
{
nextPacket = MP_RX_MSDU_NEXT_MSDU(currentPacket);
// Go through the FRAGMENTs in this PACKET & create an MDL chain
mdlChain = NULL;
totalLength = 0;
for (fragmentIndex = 0;
fragmentIndex < MP_RX_MSDU_MPDU_COUNT(currentPacket);
fragmentIndex++)
{
currentFragment = MP_RX_MSDU_MPDU_AT(currentPacket, fragmentIndex);
totalLength += MP_RX_MPDU_LENGTH(currentFragment);
// Populate the MDL with Fragment contents
currentMdl = NdisAllocateMdl(Port->MiniportAdapterHandle,
MP_RX_MPDU_DATA(currentFragment),
MP_RX_MPDU_LENGTH(currentFragment)
);
if (currentMdl == NULL)
{
MpTrace(COMP_RECV, DBG_SERIOUS, ("Failed to allocate MDL for a MP_RX_MPDU data\n"));
ndisStatus = NDIS_STATUS_RESOURCES;
break;
}
// Add this to the MDL chain
if (mdlChain == NULL)
{
// Add this to the head
mdlChain = currentMdl;
}
else
{
NDIS_MDL_LINKAGE(prevMdl) = currentMdl;
}
prevMdl = currentMdl;
}
if (ndisStatus != NDIS_STATUS_SUCCESS)
{
while (mdlChain != NULL)
{
currentMdl = mdlChain;
mdlChain = NDIS_MDL_LINKAGE(currentMdl);
// MDL was allocated
NdisFreeMdl(currentMdl);
}
break;
}
// Allocate the NET_BUFFER_LIST and the NET_BUFFER
currentNetBufferList = NdisAllocateNetBufferAndNetBufferList(
Port->RxNetBufferListPool,
0,
0,
mdlChain,
0,
totalLength
);
if (currentNetBufferList == NULL)
{
MpTrace(COMP_SEND, DBG_SERIOUS, ("Failed to allocate NET_BUFFER_LIST for MP_RX_MSDU \n"));
ndisStatus = NDIS_STATUS_RESOURCES;
break;
}
// Populate the RX_PACKET
MP_NBL_WRAPPED_RX_MSDU(currentNetBufferList) = currentPacket;
MP_NBL_SOURCE_PORT(currentNetBufferList) = Port;
if (outputNetBufferList == NULL)
{
outputNetBufferList = currentNetBufferList;
}
else
{
NET_BUFFER_LIST_NEXT_NBL(prevNetBufferList) = currentNetBufferList;
}
// The Next PACKET's NBL would be added after the current PACKET's NBL
prevNetBufferList = currentNetBufferList;
osRecvContext = MP_RX_MSDU_RECV_CONTEXT(currentPacket);
MP_ASSIGN_NDIS_OBJECT_HEADER(osRecvContext->Header,
NDIS_OBJECT_TYPE_DEFAULT,
DOT11_EXTSTA_RECV_CONTEXT_REVISION_1,
sizeof(DOT11_EXTSTA_RECV_CONTEXT));
MP_SET_RECEIVE_CONTEXT(currentNetBufferList, osRecvContext);
currentPacket = nextPacket;
}
if (ndisStatus != NDIS_STATUS_SUCCESS)
{
if (outputNetBufferList != NULL)
{
BasePortFreeTranslatedRxNBLs(Port, outputNetBufferList);
outputNetBufferList = NULL;
}
}
*NetBufferLists = outputNetBufferList;
return ndisStatus;
}
