path: root/MdePkg/Include/Protocol/SimpleNetwork.h

/** @file
  Simple Network protocol as defined in the UEFI 2.0 specification.

  Basic network device abstraction.

  Rx    - Received
  Tx    - Transmit
  MCast - MultiCast
  ...

  Copyright (c) 2006 - 2008, Intel Corporation                                                         
  All rights reserved. This program and the accompanying materials                          
  are licensed and made available under the terms and conditions of the BSD License         
  which accompanies this distribution.  The full text of the license may be found at        
  http://opensource.org/licenses/bsd-license.php                                            

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             

**/

#ifndef __SIMPLE_NETWORK_H__
#define __SIMPLE_NETWORK_H__

#define EFI_SIMPLE_NETWORK_PROTOCOL_GUID \
  { \
    0xA19832B9, 0xAC25, 0x11D3, {0x9A, 0x2D, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0x4D } \
  }

typedef struct _EFI_SIMPLE_NETWORK_PROTOCOL  EFI_SIMPLE_NETWORK_PROTOCOL;


///
/// Protocol defined in EFI1.1.
/// 
typedef EFI_SIMPLE_NETWORK_PROTOCOL   EFI_SIMPLE_NETWORK;

///
/// Simple Network Protocol data structures
///
typedef struct {
  ///
  /// Total number of frames received.  Includes frames with errors and
  /// dropped frames.
  ///
  UINT64  RxTotalFrames;

  ///
  /// Number of valid frames received and copied into receive buffers.
  ///
  UINT64  RxGoodFrames;

  ///
  /// Number of frames below the minimum length for the media.
  /// This would be <64 for ethernet.
  ///
  UINT64  RxUndersizeFrames;

  ///
  /// Number of frames longer than the maxminum length for the
  /// media.  This would be >1500 for ethernet.
  ///
  UINT64  RxOversizeFrames;

  ///
  /// Valid frames that were dropped because receive buffers were full.
  ///
  UINT64  RxDroppedFrames;

  ///
  /// Number of valid unicast frames received and not dropped.
  ///
  UINT64  RxUnicastFrames;

  ///
  /// Number of valid broadcast frames received and not dropped.
  ///
  UINT64  RxBroadcastFrames;

  ///
  /// Number of valid mutlicast frames received and not dropped.
  ///
  UINT64  RxMulticastFrames;

  ///
  /// Number of frames w/ CRC or alignment errors.
  ///
  UINT64  RxCrcErrorFrames;

  ///
  /// Total number of bytes received.  Includes frames with errors
  /// and dropped frames.
  //
  UINT64  RxTotalBytes;

  ///
  /// Transmit statistics.
  ///
  UINT64  TxTotalFrames;
  UINT64  TxGoodFrames;
  UINT64  TxUndersizeFrames;
  UINT64  TxOversizeFrames;
  UINT64  TxDroppedFrames;
  UINT64  TxUnicastFrames;
  UINT64  TxBroadcastFrames;
  UINT64  TxMulticastFrames;
  UINT64  TxCrcErrorFrames;
  UINT64  TxTotalBytes;

  ///
  /// Number of collisions detection on this subnet.
  ///
  UINT64  Collisions;

  ///
  /// Number of frames destined for unsupported protocol.
  ///
  UINT64  UnsupportedProtocol;

} EFI_NETWORK_STATISTICS;

///
/// State of the network interface
/// When an EFI_SIMPLE_NETWORK_PROTOCOL driver initializes a
/// network interface, the network interface is left in the EfiSimpleNetworkStopped state.
///
typedef enum {
  EfiSimpleNetworkStopped,
  EfiSimpleNetworkStarted,
  EfiSimpleNetworkInitialized,
  EfiSimpleNetworkMaxState
} EFI_SIMPLE_NETWORK_STATE;

#define EFI_SIMPLE_NETWORK_RECEIVE_UNICAST                0x01
#define EFI_SIMPLE_NETWORK_RECEIVE_MULTICAST              0x02
#define EFI_SIMPLE_NETWORK_RECEIVE_BROADCAST              0x04
#define EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS            0x08
#define EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS_MULTICAST  0x10

#define EFI_SIMPLE_NETWORK_RECEIVE_INTERRUPT              0x01
#define EFI_SIMPLE_NETWORK_TRANSMIT_INTERRUPT             0x02
#define EFI_SIMPLE_NETWORK_COMMAND_INTERRUPT              0x04
#define EFI_SIMPLE_NETWORK_SOFTWARE_INTERRUPT             0x08

#define MAX_MCAST_FILTER_CNT                              16
typedef struct {
  ///
  /// Reports the current state of the network interface.
  ///
  UINT32          State;
  ///
  /// The size, in bytes, of the network interface's HW address.
  ///
  UINT32          HwAddressSize;
  ///
  /// The size, in bytes, of the network interface's media header.
  ///
  UINT32          MediaHeaderSize;
  ///
  /// The maximum size, in bytes, of the packets supported by the network interface.
  ///
  UINT32          MaxPacketSize;
  ///
  /// The size, in bytes, of the NVRAM device attached to the network interface.
  ///
  UINT32          NvRamSize;
  ///
  /// The size that must be used for all NVRAM reads and writes. The
  /// start address for NVRAM read and write operations and the total
  /// length of those operations, must be a multiple of this value. The
  /// legal values for this field are 0, 1, 2, 4, and 8.
  ///
  UINT32          NvRamAccessSize;
  ///
  /// The multicast receive filter settings supported by the network interface.
  ///
  UINT32          ReceiveFilterMask;
  ///
  /// The current multicast receive filter settings.
  ///
  UINT32          ReceiveFilterSetting;
  ///
  /// The maximum number of multicast address receive filters supported by the driver.
  ///
  UINT32          MaxMCastFilterCount;
  ///
  /// The current number of multicast address receive filters.
  ///
  UINT32          MCastFilterCount;
  ///
  /// Array containing the addresses of the current multicast address receive filters.
  ///
  EFI_MAC_ADDRESS MCastFilter[MAX_MCAST_FILTER_CNT];
  ///
  /// The current HW MAC address for the network interface.
  ///
  EFI_MAC_ADDRESS CurrentAddress;
  ///
  /// The current HW MAC address for broadcast packets.
  ///
  EFI_MAC_ADDRESS BroadcastAddress;
  ///
  /// The permanent HW MAC address for the network interface.
  ///
  EFI_MAC_ADDRESS PermanentAddress;
  ///
  /// The interface type of the network interface.
  ///
  UINT8           IfType;
  ///
  /// TRUE if the HW MAC address can be changed.
  ///
  BOOLEAN         MacAddressChangeable;
  ///
  /// TRUE if the network interface can transmit more than one packet at a time.
  ///
  BOOLEAN         MultipleTxSupported;
  ///
  /// TRUE if the presence of media can be determined; otherwise FALSE.
  ///
  BOOLEAN         MediaPresentSupported;
  ///
  /// TRUE if media are connected to the network interface; otherwise FALSE.
  ///
  BOOLEAN         MediaPresent;
} EFI_SIMPLE_NETWORK_MODE;

//
// Protocol Member Functions
//
/**
  Changes the state of a network interface from "stopped" to "started".

  @param  This Protocol instance pointer.

  @retval EFI_SUCCESS           The network interface was started.
  @retval EFI_ALREADY_STARTED   The network interface is already in the started state.
  @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  @retval EFI_UNSUPPORTED       This function is not supported by the network interface.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_START)(
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This
  );

/**
  Changes the state of a network interface from "started" to "stopped".

  @param  This Protocol instance pointer.

  @retval EFI_SUCCESS           The network interface was stopped.
  @retval EFI_ALREADY_STARTED   The network interface is already in the stopped state.
  @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  @retval EFI_UNSUPPORTED       This function is not supported by the network interface.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_STOP)(
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This
  );

/**
  Resets a network adapter and allocates the transmit and receive buffers 
  required by the network interface; optionally, also requests allocation 
  of additional transmit and receive buffers.

  @param  This              Protocol instance pointer.
  @param  ExtraRxBufferSize The size, in bytes, of the extra receive buffer space
                            that the driver should allocate for the network interface.
                            Some network interfaces will not be able to use the extra
                            buffer, and the caller will not know if it is actually
                            being used.
  @param  ExtraTxBufferSize The size, in bytes, of the extra transmit buffer space
                            that the driver should allocate for the network interface.
                            Some network interfaces will not be able to use the extra
                            buffer, and the caller will not know if it is actually
                            being used.

  @retval EFI_SUCCESS           The network interface was initialized.
  @retval EFI_NOT_STARTED       The network interface has not been started
  @retval EFI_OUT_OF_RESOURCES  There was not enough memory for the transmit and
                                receive buffers.   .
  @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  @retval EFI_UNSUPPORTED       This function is not supported by the network interface.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_INITIALIZE)(
  IN EFI_SIMPLE_NETWORK_PROTOCOL                    *This,
  IN UINTN                                          ExtraRxBufferSize  OPTIONAL,
  IN UINTN                                          ExtraTxBufferSize  OPTIONAL
  );

/**
  Resets a network adapter and re-initializes it with the parameters that were 
  provided in the previous call to Initialize().  

  @param  This                 Protocol instance pointer.
  @param  ExtendedVerification Indicates that the driver may perform a more
                               exhaustive verification operation of the device
                               during reset.

  @retval EFI_SUCCESS           The network interface was reset.
  @retval EFI_NOT_STARTED       The network interface has not been started
  @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  @retval EFI_UNSUPPORTED       This function is not supported by the network interface.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_RESET)(
  IN EFI_SIMPLE_NETWORK_PROTOCOL   *This,
  IN BOOLEAN                       ExtendedVerification
  );

/**
  Resets a network adapter and leaves it in a state that is safe for 
  another driver to initialize.

  @param  This Protocol instance pointer.

  @retval EFI_SUCCESS           The network interface was shutdown.
  @retval EFI_NOT_STARTED       The network interface has not been started
  @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  @retval EFI_UNSUPPORTED       This function is not supported by the network interface.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_SHUTDOWN)(
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This
  );

/**
  Manages the multicast receive filters of a network interface.

  @param  This             Protocol instance pointer.
  @param  Enable           A bit mask of receive filters to enable on the network interface.
  @param  Disable          A bit mask of receive filters to disable on the network interface.
  @param  ResetMCastFilter Set to TRUE to reset the contents of the multicast receive
                           filters on the network interface to their default values.
  @param  McastFilterCnt   Number of multicast HW MAC addresses in the new
                           MCastFilter list. This value must be less than or equal to
                           the MCastFilterCnt field of EFI_SIMPLE_NETWORK_MODE. This
                           field is optional if ResetMCastFilter is TRUE.
  @param  MCastFilter      A pointer to a list of new multicast receive filter HW MAC
                           addresses. This list will replace any existing multicast
                           HW MAC address list. This field is optional if
                           ResetMCastFilter is TRUE.

  @retval EFI_SUCCESS           The multicast receive filter list was updated.
  @retval EFI_NOT_STARTED       The network interface has not been started
  @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  @retval EFI_UNSUPPORTED       This function is not supported by the network interface.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_RECEIVE_FILTERS)(
  IN EFI_SIMPLE_NETWORK_PROTOCOL                             *This,
  IN UINT32                                                  Enable,
  IN UINT32                                                  Disable,
  IN BOOLEAN                                                 ResetMCastFilter,
  IN UINTN                                                   MCastFilterCnt     OPTIONAL,
  IN EFI_MAC_ADDRESS                                         *MCastFilter OPTIONAL
  );

/**
  Modifies or resets the current station address, if supported.

  @param  This  Protocol instance pointer.
  @param  Reset Flag used to reset the station address to the network interfaces
                permanent address.
  @param  New   New station address to be used for the network interface.

  @retval EFI_SUCCESS           The network interfaces station address was updated.
  @retval EFI_NOT_STARTED       The network interface has not been started
  @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  @retval EFI_UNSUPPORTED       This function is not supported by the network interface.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_STATION_ADDRESS)(
  IN EFI_SIMPLE_NETWORK_PROTOCOL            *This,
  IN BOOLEAN                                Reset,
  IN EFI_MAC_ADDRESS                        *New OPTIONAL
  );

/**
  Resets or collects the statistics on a network interface.

  @param  This            Protocol instance pointer.
  @param  Reset           Set to TRUE to reset the statistics for the network interface.
  @param  StatisticsSize  On input the size, in bytes, of StatisticsTable. On
                          output the size, in bytes, of the resulting table of
                          statistics.
  @param  StatisticsTable A pointer to the EFI_NETWORK_STATISTICS structure that
                          contains the statistics.

  @retval EFI_SUCCESS           The statistics were collected from the network interface.
  @retval EFI_NOT_STARTED       The network interface has not been started.
  @retval EFI_BUFFER_TOO_SMALL  The Statistics buffer was too small. The current buffer
                                size needed to hold the statistics is returned in
                                StatisticsSize.
  @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  @retval EFI_UNSUPPORTED       This function is not supported by the network interface.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_STATISTICS)(
  IN EFI_SIMPLE_NETWORK_PROTOCOL          *This,
  IN BOOLEAN                              Reset,
  IN OUT UINTN                            *StatisticsSize   OPTIONAL,
  OUT EFI_NETWORK_STATISTICS              *StatisticsTable  OPTIONAL
  );

/**
  Converts a multicast IP address to a multicast HW MAC address.

  @param  This Protocol instance pointer.
  @param  IPv6 Set to TRUE if the multicast IP address is IPv6 [RFC 2460]. Set
               to FALSE if the multicast IP address is IPv4 [RFC 791].
  @param  IP   The multicast IP address that is to be converted to a multicast
               HW MAC address.
  @param  MAC  The multicast HW MAC address that is to be generated from IP.

  @retval EFI_SUCCESS           The multicast IP address was mapped to the multicast
                                HW MAC address.
  @retval EFI_NOT_STARTED       The network interface has not been started.
  @retval EFI_BUFFER_TOO_SMALL  The Statistics buffer was too small. The current buffer
                                size needed to hold the statistics is returned in
                                StatisticsSize.
  @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  @retval EFI_UNSUPPORTED       This function is not supported by the network interface.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_MCAST_IP_TO_MAC)(
  IN EFI_SIMPLE_NETWORK_PROTOCOL          *This,
  IN BOOLEAN                              IPv6,
  IN EFI_IP_ADDRESS                       *IP,
  OUT EFI_MAC_ADDRESS                     *MAC
  );

/**
  Performs read and write operations on the NVRAM device attached to a 
  network interface.

  @param  This       Protocol instance pointer.
  @param  ReadWrite  TRUE for read operations, FALSE for write operations.
  @param  Offset     Byte offset in the NVRAM device at which to start the read or
                     write operation. This must be a multiple of NvRamAccessSize and
                     less than NvRamSize.
  @param  BufferSize The number of bytes to read or write from the NVRAM device.
                     This must also be a multiple of NvramAccessSize.
  @param  Buffer     A pointer to the data buffer.

  @retval EFI_SUCCESS           The NVRAM access was performed.
  @retval EFI_NOT_STARTED       The network interface has not been started.
  @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  @retval EFI_UNSUPPORTED       This function is not supported by the network interface.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_NVDATA)(
  IN EFI_SIMPLE_NETWORK_PROTOCOL          *This,
  IN BOOLEAN                              ReadWrite,
  IN UINTN                                Offset,
  IN UINTN                                BufferSize,
  IN OUT VOID                             *Buffer
  );

/**
  Reads the current interrupt status and recycled transmit buffer status from 
  a network interface.

  @param  This            Protocol instance pointer.
  @param  InterruptStatus A pointer to the bit mask of the currently active interrupts
                          If this is NULL, the interrupt status will not be read from
                          the device. If this is not NULL, the interrupt status will
                          be read from the device. When the  interrupt status is read,
                          it will also be cleared. Clearing the transmit  interrupt
                          does not empty the recycled transmit buffer array.
  @param  TxBuf           Recycled transmit buffer address. The network interface will
                          not transmit if its internal recycled transmit buffer array
                          is full. Reading the transmit buffer does not clear the
                          transmit interrupt. If this is NULL, then the transmit buffer
                          status will not be read. If there are no transmit buffers to
                          recycle and TxBuf is not NULL, * TxBuf will be set to NULL.

  @retval EFI_SUCCESS           The status of the network interface was retrieved.
  @retval EFI_NOT_STARTED       The network interface has not been started.
  @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  @retval EFI_UNSUPPORTED       This function is not supported by the network interface.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_GET_STATUS)(
  IN EFI_SIMPLE_NETWORK_PROTOCOL          *This,
  OUT UINT32                              *InterruptStatus OPTIONAL,
  OUT VOID                                **TxBuf OPTIONAL
  );

/**
  Places a packet in the transmit queue of a network interface.

  @param  This       Protocol instance pointer.
  @param  HeaderSize The size, in bytes, of the media header to be filled in by
                     the Transmit() function. If HeaderSize is non-zero, then it
                     must be equal to This->Mode->MediaHeaderSize and the DestAddr
                     and Protocol parameters must not be NULL.
  @param  BufferSize The size, in bytes, of the entire packet (media header and
                     data) to be transmitted through the network interface.
  @param  Buffer     A pointer to the packet (media header followed by data) to be
                     transmitted. This parameter cannot be NULL. If HeaderSize is zero,
                     then the media header in Buffer must already be filled in by the
                     caller. If HeaderSize is non-zero, then the media header will be
                     filled in by the Transmit() function.
  @param  SrcAddr    The source HW MAC address. If HeaderSize is zero, then this parameter
                     is ignored. If HeaderSize is non-zero and SrcAddr is NULL, then
                     This->Mode->CurrentAddress is used for the source HW MAC address.
  @param  DsetAddr   The destination HW MAC address. If HeaderSize is zero, then this
                     parameter is ignored.
  @param  Protocol   The type of header to build. If HeaderSize is zero, then this
                     parameter is ignored. See RFC 1700, section "Ether Types", for
                     examples.

  @retval EFI_SUCCESS           The packet was placed on the transmit queue.
  @retval EFI_NOT_STARTED       The network interface has not been started.
  @retval EFI_NOT_READY         The network interface is too busy to accept this transmit request.                      
  @retval EFI_BUFFER_TOO_SMALL  The BufferSize parameter is too small.
  @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  @retval EFI_UNSUPPORTED       This function is not supported by the network interface.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_TRANSMIT)(
  IN EFI_SIMPLE_NETWORK_PROTOCOL          *This,
  IN UINTN                                HeaderSize,
  IN UINTN                                BufferSize,
  IN VOID                                 *Buffer,
  IN EFI_MAC_ADDRESS                      *SrcAddr  OPTIONAL,
  IN EFI_MAC_ADDRESS                      *DestAddr OPTIONAL,
  IN UINT16                               *Protocol OPTIONAL
  );

/**
  Receives a packet from a network interface.

  @param  This       Protocol instance pointer.
  @param  HeaderSize The size, in bytes, of the media header received on the network
                     interface. If this parameter is NULL, then the media header size
                     will not be returned.
  @param  BufferSize On entry, the size, in bytes, of Buffer. On exit, the size, in
                     bytes, of the packet that was received on the network interface.
  @param  Buffer     A pointer to the data buffer to receive both the media header and
                     the data.
  @param  SrcAddr    The source HW MAC address. If this parameter is NULL, the
                     HW MAC source address will not be extracted from the media
                     header.
  @param  DsetAddr   The destination HW MAC address. If this parameter is NULL,
                     the HW MAC destination address will not be extracted from the
                     media header.
  @param  Protocol   The media header type. If this parameter is NULL, then the
                     protocol will not be extracted from the media header. See
                     RFC 1700 section "Ether Types" for examples.

  @retval  EFI_SUCCESS           The received data was stored in Buffer, and BufferSize has
                                 been updated to the number of bytes received.
  @retval  EFI_NOT_STARTED       The network interface has not been started.
  @retval  EFI_NOT_READY         The network interface is too busy to accept this transmit
                                 request.
  @retval  EFI_BUFFER_TOO_SMALL  The BufferSize parameter is too small.
  @retval  EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  @retval  EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  @retval  EFI_UNSUPPORTED       This function is not supported by the network interface.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIMPLE_NETWORK_RECEIVE)(
  IN EFI_SIMPLE_NETWORK_PROTOCOL          *This,
  OUT UINTN                               *HeaderSize OPTIONAL,
  IN OUT UINTN                            *BufferSize,
  OUT VOID                                *Buffer,
  OUT EFI_MAC_ADDRESS                     *SrcAddr    OPTIONAL,
  OUT EFI_MAC_ADDRESS                     *DestAddr   OPTIONAL,
  OUT UINT16                              *Protocol   OPTIONAL
  );

#define EFI_SIMPLE_NETWORK_PROTOCOL_REVISION  0x00010000

//
// Revision defined in EFI1.1
// 
#define EFI_SIMPLE_NETWORK_INTERFACE_REVISION   EFI_SIMPLE_NETWORK_PROTOCOL_REVISION

///
/// The EFI_SIMPLE_NETWORK_PROTOCOL protocol is used to initialize access 
/// to a network adapter. Once the network adapter initializes, 
/// the EFI_SIMPLE_NETWORK_PROTOCOL protocol provides services that 
/// allow packets to be transmitted and received.
///
struct _EFI_SIMPLE_NETWORK_PROTOCOL {
  ///
  /// Revision of the EFI_SIMPLE_NETWORK_PROTOCOL. All future revisions must 
  /// be backwards compatible. If a future version is not backwards compatible 
  /// it is not the same GUID.
  ///
  UINT64                              Revision;
  EFI_SIMPLE_NETWORK_START            Start;
  EFI_SIMPLE_NETWORK_STOP             Stop;
  EFI_SIMPLE_NETWORK_INITIALIZE       Initialize;
  EFI_SIMPLE_NETWORK_RESET            Reset;
  EFI_SIMPLE_NETWORK_SHUTDOWN         Shutdown;
  EFI_SIMPLE_NETWORK_RECEIVE_FILTERS  ReceiveFilters;
  EFI_SIMPLE_NETWORK_STATION_ADDRESS  StationAddress;
  EFI_SIMPLE_NETWORK_STATISTICS       Statistics;
  EFI_SIMPLE_NETWORK_MCAST_IP_TO_MAC  MCastIpToMac;
  EFI_SIMPLE_NETWORK_NVDATA           NvData;
  EFI_SIMPLE_NETWORK_GET_STATUS       GetStatus;
  EFI_SIMPLE_NETWORK_TRANSMIT         Transmit;
  EFI_SIMPLE_NETWORK_RECEIVE          Receive;
  ///
  /// Event used with WaitForEvent() to wait for a packet to be received.
  ///
  EFI_EVENT                           WaitForPacket;
  ///
  /// Pointer to the EFI_SIMPLE_NETWORK_MODE data for the device.
  ///
  EFI_SIMPLE_NETWORK_MODE             *Mode;
};

extern EFI_GUID gEfiSimpleNetworkProtocolGuid;

#endif