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NdisAllocatePacket (Windows Embedded CE 6.0)

  • Статья

1/6/2010

This function allocates and initializes a packet descriptor.

Syntax

VOID NdisAllocatePacket(
  PNDIS_STATUS Status,
  PNDIS_PACKET* Packet,
  NDIS_HANDLE PoolHandle
);

Parameters

  • Status
    [out] Pointer to a caller-supplied variable in which this function returns the final status of the request.
  • Packet
    [out] Pointer to a caller-supplied variable in which this function returns a pointer to the allocated packet descriptor.

Return Value

The following table shows the return values for NdisAllocatePacket.

Value Description

NDIS_STATUS_SUCCESS

The caller can use the packet descriptor returned by the Packet parameter.

NDIS_STATUS_RESOURCES

The free list for the packet pool currently has no available entries. A subsequent call to the NdisFreePacket function returns the specified entry to the free list.

Remarks

NDIS drivers must allocate packet descriptors from a packet pool. Protocol drivers call this function one or more times for their subsequent calls to the NdisSend function. Miniports call this function one or more times for subsequent calls to the NdisMIndicateReceivePacket function. NDIS intermediate drivers must call this function to repackage sends and receive indications in fresh packet descriptors before passing incoming transfer requests on to other NDIS drivers.

Each packet descriptor eventually has one or more buffer descriptors chained to it. This function initializes the packet descriptor at 0 and sets its buffer chain pointer to NULL. The caller must chain the buffer descriptors mapping the packet data to the packet descriptor before it is sent or indicated. Most NDIS drivers allocate buffer descriptors with the NdisAllocateBuffer function.

Drivers must use the NDIS_SET_PACKET_XXX macros to access or set up any out-of-band information associated with the packet descriptor.

Requirements

Header ndis.h
Library ndis.lib
Windows Embedded CE Windows CE .NET 4.0 and later

See Also

Reference

NDIS Library Functions
NDIS_SET_PACKET_HEADER_SIZE
NDIS_SET_PACKET_MEDIA_SPECIFIC_INFO
NDIS_SET_PACKET_STATUS
NDIS_SET_PACKET_TIME_RECEIVED
NDIS_SET_PACKET_TIME_SENT
NDIS_SET_PACKET_TIME_TO_SEND
NdisAllocateBuffer
NdisAllocatePacketPool
NdisAllocateMemory
NdisFreePacket
NdisMEthIndicateReceive
NdisMIndicateReceivePacket
NdisSend