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1 /** @file
2   The EFI_SIMPLE_NETWORK_PROTOCOL provides services to initialize a network interface,
3   transmit packets, receive packets, and close a network interface.
4 
5   Basic network device abstraction.
6 
7   Rx    - Received
8   Tx    - Transmit
9   MCast - MultiCast
10   ...
11 
12 Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
13 This program and the accompanying materials are licensed and made available under
14 the terms and conditions of the BSD License that accompanies this distribution.
15 The full text of the license may be found at
16 http://opensource.org/licenses/bsd-license.php.
17 
18 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
19 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
20 
21   @par Revision Reference:
22   This Protocol is introduced in EFI Specification 1.10.
23 
24 **/
25 
26 #ifndef __SIMPLE_NETWORK_H__
27 #define __SIMPLE_NETWORK_H__
28 
29 #define EFI_SIMPLE_NETWORK_PROTOCOL_GUID \
30   { \
31     0xA19832B9, 0xAC25, 0x11D3, {0x9A, 0x2D, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0x4D } \
32   }
33 
34 typedef struct _EFI_SIMPLE_NETWORK_PROTOCOL  EFI_SIMPLE_NETWORK_PROTOCOL;
35 
36 
37 ///
38 /// Protocol defined in EFI1.1.
39 ///
40 typedef EFI_SIMPLE_NETWORK_PROTOCOL   EFI_SIMPLE_NETWORK;
41 
42 ///
43 /// Simple Network Protocol data structures.
44 ///
45 typedef struct {
46   ///
47   /// Total number of frames received.  Includes frames with errors and
48   /// dropped frames.
49   ///
50   UINT64  RxTotalFrames;
51 
52   ///
53   /// Number of valid frames received and copied into receive buffers.
54   ///
55   UINT64  RxGoodFrames;
56 
57   ///
58   /// Number of frames below the minimum length for the media.
59   /// This would be <64 for ethernet.
60   ///
61   UINT64  RxUndersizeFrames;
62 
63   ///
64   /// Number of frames longer than the maxminum length for the
65   /// media.  This would be >1500 for ethernet.
66   ///
67   UINT64  RxOversizeFrames;
68 
69   ///
70   /// Valid frames that were dropped because receive buffers were full.
71   ///
72   UINT64  RxDroppedFrames;
73 
74   ///
75   /// Number of valid unicast frames received and not dropped.
76   ///
77   UINT64  RxUnicastFrames;
78 
79   ///
80   /// Number of valid broadcast frames received and not dropped.
81   ///
82   UINT64  RxBroadcastFrames;
83 
84   ///
85   /// Number of valid mutlicast frames received and not dropped.
86   ///
87   UINT64  RxMulticastFrames;
88 
89   ///
90   /// Number of frames w/ CRC or alignment errors.
91   ///
92   UINT64  RxCrcErrorFrames;
93 
94   ///
95   /// Total number of bytes received.  Includes frames with errors
96   /// and dropped frames.
97   //
98   UINT64  RxTotalBytes;
99 
100   ///
101   /// Transmit statistics.
102   ///
103   UINT64  TxTotalFrames;
104   UINT64  TxGoodFrames;
105   UINT64  TxUndersizeFrames;
106   UINT64  TxOversizeFrames;
107   UINT64  TxDroppedFrames;
108   UINT64  TxUnicastFrames;
109   UINT64  TxBroadcastFrames;
110   UINT64  TxMulticastFrames;
111   UINT64  TxCrcErrorFrames;
112   UINT64  TxTotalBytes;
113 
114   ///
115   /// Number of collisions detection on this subnet.
116   ///
117   UINT64  Collisions;
118 
119   ///
120   /// Number of frames destined for unsupported protocol.
121   ///
122   UINT64  UnsupportedProtocol;
123 
124   ///
125   /// Number of valid frames received that were duplicated.
126   ///
127   UINT64  RxDuplicatedFrames;
128 
129   ///
130   /// Number of encrypted frames received that failed to decrypt.
131   ///
132   UINT64  RxDecryptErrorFrames;
133 
134   ///
135   /// Number of frames that failed to transmit after exceeding the retry limit.
136   ///
137   UINT64  TxErrorFrames;
138 
139   ///
140   /// Number of frames transmitted successfully after more than one attempt.
141   ///
142   UINT64  TxRetryFrames;
143 } EFI_NETWORK_STATISTICS;
144 
145 ///
146 /// The state of the network interface.
147 /// When an EFI_SIMPLE_NETWORK_PROTOCOL driver initializes a
148 /// network interface, the network interface is left in the EfiSimpleNetworkStopped state.
149 ///
150 typedef enum {
151   EfiSimpleNetworkStopped,
152   EfiSimpleNetworkStarted,
153   EfiSimpleNetworkInitialized,
154   EfiSimpleNetworkMaxState
155 } EFI_SIMPLE_NETWORK_STATE;
156 
157 #define EFI_SIMPLE_NETWORK_RECEIVE_UNICAST                0x01
158 #define EFI_SIMPLE_NETWORK_RECEIVE_MULTICAST              0x02
159 #define EFI_SIMPLE_NETWORK_RECEIVE_BROADCAST              0x04
160 #define EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS            0x08
161 #define EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS_MULTICAST  0x10
162 
163 #define EFI_SIMPLE_NETWORK_RECEIVE_INTERRUPT              0x01
164 #define EFI_SIMPLE_NETWORK_TRANSMIT_INTERRUPT             0x02
165 #define EFI_SIMPLE_NETWORK_COMMAND_INTERRUPT              0x04
166 #define EFI_SIMPLE_NETWORK_SOFTWARE_INTERRUPT             0x08
167 
168 #define MAX_MCAST_FILTER_CNT                              16
169 typedef struct {
170   ///
171   /// Reports the current state of the network interface.
172   ///
173   UINT32          State;
174   ///
175   /// The size, in bytes, of the network interface's HW address.
176   ///
177   UINT32          HwAddressSize;
178   ///
179   /// The size, in bytes, of the network interface's media header.
180   ///
181   UINT32          MediaHeaderSize;
182   ///
183   /// The maximum size, in bytes, of the packets supported by the network interface.
184   ///
185   UINT32          MaxPacketSize;
186   ///
187   /// The size, in bytes, of the NVRAM device attached to the network interface.
188   ///
189   UINT32          NvRamSize;
190   ///
191   /// The size that must be used for all NVRAM reads and writes. The
192   /// start address for NVRAM read and write operations and the total
193   /// length of those operations, must be a multiple of this value. The
194   /// legal values for this field are 0, 1, 2, 4, and 8.
195   ///
196   UINT32          NvRamAccessSize;
197   ///
198   /// The multicast receive filter settings supported by the network interface.
199   ///
200   UINT32          ReceiveFilterMask;
201   ///
202   /// The current multicast receive filter settings.
203   ///
204   UINT32          ReceiveFilterSetting;
205   ///
206   /// The maximum number of multicast address receive filters supported by the driver.
207   ///
208   UINT32          MaxMCastFilterCount;
209   ///
210   /// The current number of multicast address receive filters.
211   ///
212   UINT32          MCastFilterCount;
213   ///
214   /// Array containing the addresses of the current multicast address receive filters.
215   ///
216   EFI_MAC_ADDRESS MCastFilter[MAX_MCAST_FILTER_CNT];
217   ///
218   /// The current HW MAC address for the network interface.
219   ///
220   EFI_MAC_ADDRESS CurrentAddress;
221   ///
222   /// The current HW MAC address for broadcast packets.
223   ///
224   EFI_MAC_ADDRESS BroadcastAddress;
225   ///
226   /// The permanent HW MAC address for the network interface.
227   ///
228   EFI_MAC_ADDRESS PermanentAddress;
229   ///
230   /// The interface type of the network interface.
231   ///
232   UINT8           IfType;
233   ///
234   /// TRUE if the HW MAC address can be changed.
235   ///
236   BOOLEAN         MacAddressChangeable;
237   ///
238   /// TRUE if the network interface can transmit more than one packet at a time.
239   ///
240   BOOLEAN         MultipleTxSupported;
241   ///
242   /// TRUE if the presence of media can be determined; otherwise FALSE.
243   ///
244   BOOLEAN         MediaPresentSupported;
245   ///
246   /// TRUE if media are connected to the network interface; otherwise FALSE.
247   ///
248   BOOLEAN         MediaPresent;
249 } EFI_SIMPLE_NETWORK_MODE;
250 
251 //
252 // Protocol Member Functions
253 //
254 /**
255   Changes the state of a network interface from "stopped" to "started".
256 
257   @param  This Protocol instance pointer.
258 
259   @retval EFI_SUCCESS           The network interface was started.
260   @retval EFI_ALREADY_STARTED   The network interface is already in the started state.
261   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
262   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
263   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
264 
265 **/
266 typedef
267 EFI_STATUS
268 (EFIAPI *EFI_SIMPLE_NETWORK_START)(
269   IN EFI_SIMPLE_NETWORK_PROTOCOL  *This
270   );
271 
272 /**
273   Changes the state of a network interface from "started" to "stopped".
274 
275   @param  This Protocol instance pointer.
276 
277   @retval EFI_SUCCESS           The network interface was stopped.
278   @retval EFI_ALREADY_STARTED   The network interface is already in the stopped state.
279   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
280   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
281   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
282 
283 **/
284 typedef
285 EFI_STATUS
286 (EFIAPI *EFI_SIMPLE_NETWORK_STOP)(
287   IN EFI_SIMPLE_NETWORK_PROTOCOL  *This
288   );
289 
290 /**
291   Resets a network adapter and allocates the transmit and receive buffers
292   required by the network interface; optionally, also requests allocation
293   of additional transmit and receive buffers.
294 
295   @param  This              The protocol instance pointer.
296   @param  ExtraRxBufferSize The size, in bytes, of the extra receive buffer space
297                             that the driver should allocate for the network interface.
298                             Some network interfaces will not be able to use the extra
299                             buffer, and the caller will not know if it is actually
300                             being used.
301   @param  ExtraTxBufferSize The size, in bytes, of the extra transmit buffer space
302                             that the driver should allocate for the network interface.
303                             Some network interfaces will not be able to use the extra
304                             buffer, and the caller will not know if it is actually
305                             being used.
306 
307   @retval EFI_SUCCESS           The network interface was initialized.
308   @retval EFI_NOT_STARTED       The network interface has not been started.
309   @retval EFI_OUT_OF_RESOURCES  There was not enough memory for the transmit and
310                                 receive buffers.
311   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
312   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
313   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
314 
315 **/
316 typedef
317 EFI_STATUS
318 (EFIAPI *EFI_SIMPLE_NETWORK_INITIALIZE)(
319   IN EFI_SIMPLE_NETWORK_PROTOCOL                    *This,
320   IN UINTN                                          ExtraRxBufferSize  OPTIONAL,
321   IN UINTN                                          ExtraTxBufferSize  OPTIONAL
322   );
323 
324 /**
325   Resets a network adapter and re-initializes it with the parameters that were
326   provided in the previous call to Initialize().
327 
328   @param  This                 The protocol instance pointer.
329   @param  ExtendedVerification Indicates that the driver may perform a more
330                                exhaustive verification operation of the device
331                                during reset.
332 
333   @retval EFI_SUCCESS           The network interface was reset.
334   @retval EFI_NOT_STARTED       The network interface has not been started.
335   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
336   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
337   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
338 
339 **/
340 typedef
341 EFI_STATUS
342 (EFIAPI *EFI_SIMPLE_NETWORK_RESET)(
343   IN EFI_SIMPLE_NETWORK_PROTOCOL   *This,
344   IN BOOLEAN                       ExtendedVerification
345   );
346 
347 /**
348   Resets a network adapter and leaves it in a state that is safe for
349   another driver to initialize.
350 
351   @param  This Protocol instance pointer.
352 
353   @retval EFI_SUCCESS           The network interface was shutdown.
354   @retval EFI_NOT_STARTED       The network interface has not been started.
355   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
356   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
357   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
358 
359 **/
360 typedef
361 EFI_STATUS
362 (EFIAPI *EFI_SIMPLE_NETWORK_SHUTDOWN)(
363   IN EFI_SIMPLE_NETWORK_PROTOCOL  *This
364   );
365 
366 /**
367   Manages the multicast receive filters of a network interface.
368 
369   @param  This             The protocol instance pointer.
370   @param  Enable           A bit mask of receive filters to enable on the network interface.
371   @param  Disable          A bit mask of receive filters to disable on the network interface.
372   @param  ResetMCastFilter Set to TRUE to reset the contents of the multicast receive
373                            filters on the network interface to their default values.
374   @param  McastFilterCnt   Number of multicast HW MAC addresses in the new
375                            MCastFilter list. This value must be less than or equal to
376                            the MCastFilterCnt field of EFI_SIMPLE_NETWORK_MODE. This
377                            field is optional if ResetMCastFilter is TRUE.
378   @param  MCastFilter      A pointer to a list of new multicast receive filter HW MAC
379                            addresses. This list will replace any existing multicast
380                            HW MAC address list. This field is optional if
381                            ResetMCastFilter is TRUE.
382 
383   @retval EFI_SUCCESS           The multicast receive filter list was updated.
384   @retval EFI_NOT_STARTED       The network interface has not been started.
385   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
386   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
387   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
388 
389 **/
390 typedef
391 EFI_STATUS
392 (EFIAPI *EFI_SIMPLE_NETWORK_RECEIVE_FILTERS)(
393   IN EFI_SIMPLE_NETWORK_PROTOCOL                             *This,
394   IN UINT32                                                  Enable,
395   IN UINT32                                                  Disable,
396   IN BOOLEAN                                                 ResetMCastFilter,
397   IN UINTN                                                   MCastFilterCnt     OPTIONAL,
398   IN EFI_MAC_ADDRESS                                         *MCastFilter OPTIONAL
399   );
400 
401 /**
402   Modifies or resets the current station address, if supported.
403 
404   @param  This  The protocol instance pointer.
405   @param  Reset Flag used to reset the station address to the network interfaces
406                 permanent address.
407   @param  New   The new station address to be used for the network interface.
408 
409   @retval EFI_SUCCESS           The network interfaces station address was updated.
410   @retval EFI_NOT_STARTED       The network interface has not been started.
411   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
412   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
413   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
414 
415 **/
416 typedef
417 EFI_STATUS
418 (EFIAPI *EFI_SIMPLE_NETWORK_STATION_ADDRESS)(
419   IN EFI_SIMPLE_NETWORK_PROTOCOL            *This,
420   IN BOOLEAN                                Reset,
421   IN EFI_MAC_ADDRESS                        *New OPTIONAL
422   );
423 
424 /**
425   Resets or collects the statistics on a network interface.
426 
427   @param  This            Protocol instance pointer.
428   @param  Reset           Set to TRUE to reset the statistics for the network interface.
429   @param  StatisticsSize  On input the size, in bytes, of StatisticsTable. On
430                           output the size, in bytes, of the resulting table of
431                           statistics.
432   @param  StatisticsTable A pointer to the EFI_NETWORK_STATISTICS structure that
433                           contains the statistics.
434 
435   @retval EFI_SUCCESS           The statistics were collected from the network interface.
436   @retval EFI_NOT_STARTED       The network interface has not been started.
437   @retval EFI_BUFFER_TOO_SMALL  The Statistics buffer was too small. The current buffer
438                                 size needed to hold the statistics is returned in
439                                 StatisticsSize.
440   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
441   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
442   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
443 
444 **/
445 typedef
446 EFI_STATUS
447 (EFIAPI *EFI_SIMPLE_NETWORK_STATISTICS)(
448   IN EFI_SIMPLE_NETWORK_PROTOCOL          *This,
449   IN BOOLEAN                              Reset,
450   IN OUT UINTN                            *StatisticsSize   OPTIONAL,
451   OUT EFI_NETWORK_STATISTICS              *StatisticsTable  OPTIONAL
452   );
453 
454 /**
455   Converts a multicast IP address to a multicast HW MAC address.
456 
457   @param  This The protocol instance pointer.
458   @param  IPv6 Set to TRUE if the multicast IP address is IPv6 [RFC 2460]. Set
459                to FALSE if the multicast IP address is IPv4 [RFC 791].
460   @param  IP   The multicast IP address that is to be converted to a multicast
461                HW MAC address.
462   @param  MAC  The multicast HW MAC address that is to be generated from IP.
463 
464   @retval EFI_SUCCESS           The multicast IP address was mapped to the multicast
465                                 HW MAC address.
466   @retval EFI_NOT_STARTED       The network interface has not been started.
467   @retval EFI_BUFFER_TOO_SMALL  The Statistics buffer was too small. The current buffer
468                                 size needed to hold the statistics is returned in
469                                 StatisticsSize.
470   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
471   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
472   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
473 
474 **/
475 typedef
476 EFI_STATUS
477 (EFIAPI *EFI_SIMPLE_NETWORK_MCAST_IP_TO_MAC)(
478   IN EFI_SIMPLE_NETWORK_PROTOCOL          *This,
479   IN BOOLEAN                              IPv6,
480   IN EFI_IP_ADDRESS                       *IP,
481   OUT EFI_MAC_ADDRESS                     *MAC
482   );
483 
484 /**
485   Performs read and write operations on the NVRAM device attached to a
486   network interface.
487 
488   @param  This       The protocol instance pointer.
489   @param  ReadWrite  TRUE for read operations, FALSE for write operations.
490   @param  Offset     Byte offset in the NVRAM device at which to start the read or
491                      write operation. This must be a multiple of NvRamAccessSize and
492                      less than NvRamSize.
493   @param  BufferSize The number of bytes to read or write from the NVRAM device.
494                      This must also be a multiple of NvramAccessSize.
495   @param  Buffer     A pointer to the data buffer.
496 
497   @retval EFI_SUCCESS           The NVRAM access was performed.
498   @retval EFI_NOT_STARTED       The network interface has not been started.
499   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
500   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
501   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
502 
503 **/
504 typedef
505 EFI_STATUS
506 (EFIAPI *EFI_SIMPLE_NETWORK_NVDATA)(
507   IN EFI_SIMPLE_NETWORK_PROTOCOL          *This,
508   IN BOOLEAN                              ReadWrite,
509   IN UINTN                                Offset,
510   IN UINTN                                BufferSize,
511   IN OUT VOID                             *Buffer
512   );
513 
514 /**
515   Reads the current interrupt status and recycled transmit buffer status from
516   a network interface.
517 
518   @param  This            The protocol instance pointer.
519   @param  InterruptStatus A pointer to the bit mask of the currently active interrupts
520                           If this is NULL, the interrupt status will not be read from
521                           the device. If this is not NULL, the interrupt status will
522                           be read from the device. When the  interrupt status is read,
523                           it will also be cleared. Clearing the transmit  interrupt
524                           does not empty the recycled transmit buffer array.
525   @param  TxBuf           Recycled transmit buffer address. The network interface will
526                           not transmit if its internal recycled transmit buffer array
527                           is full. Reading the transmit buffer does not clear the
528                           transmit interrupt. If this is NULL, then the transmit buffer
529                           status will not be read. If there are no transmit buffers to
530                           recycle and TxBuf is not NULL, * TxBuf will be set to NULL.
531 
532   @retval EFI_SUCCESS           The status of the network interface was retrieved.
533   @retval EFI_NOT_STARTED       The network interface has not been started.
534   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
535   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
536   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
537 
538 **/
539 typedef
540 EFI_STATUS
541 (EFIAPI *EFI_SIMPLE_NETWORK_GET_STATUS)(
542   IN EFI_SIMPLE_NETWORK_PROTOCOL          *This,
543   OUT UINT32                              *InterruptStatus OPTIONAL,
544   OUT VOID                                **TxBuf OPTIONAL
545   );
546 
547 /**
548   Places a packet in the transmit queue of a network interface.
549 
550   @param  This       The protocol instance pointer.
551   @param  HeaderSize The size, in bytes, of the media header to be filled in by
552                      the Transmit() function. If HeaderSize is non-zero, then it
553                      must be equal to This->Mode->MediaHeaderSize and the DestAddr
554                      and Protocol parameters must not be NULL.
555   @param  BufferSize The size, in bytes, of the entire packet (media header and
556                      data) to be transmitted through the network interface.
557   @param  Buffer     A pointer to the packet (media header followed by data) to be
558                      transmitted. This parameter cannot be NULL. If HeaderSize is zero,
559                      then the media header in Buffer must already be filled in by the
560                      caller. If HeaderSize is non-zero, then the media header will be
561                      filled in by the Transmit() function.
562   @param  SrcAddr    The source HW MAC address. If HeaderSize is zero, then this parameter
563                      is ignored. If HeaderSize is non-zero and SrcAddr is NULL, then
564                      This->Mode->CurrentAddress is used for the source HW MAC address.
565   @param  DestAddr   The destination HW MAC address. If HeaderSize is zero, then this
566                      parameter is ignored.
567   @param  Protocol   The type of header to build. If HeaderSize is zero, then this
568                      parameter is ignored. See RFC 1700, section "Ether Types", for
569                      examples.
570 
571   @retval EFI_SUCCESS           The packet was placed on the transmit queue.
572   @retval EFI_NOT_STARTED       The network interface has not been started.
573   @retval EFI_NOT_READY         The network interface is too busy to accept this transmit request.
574   @retval EFI_BUFFER_TOO_SMALL  The BufferSize parameter is too small.
575   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
576   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
577   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
578 
579 **/
580 typedef
581 EFI_STATUS
582 (EFIAPI *EFI_SIMPLE_NETWORK_TRANSMIT)(
583   IN EFI_SIMPLE_NETWORK_PROTOCOL          *This,
584   IN UINTN                                HeaderSize,
585   IN UINTN                                BufferSize,
586   IN VOID                                 *Buffer,
587   IN EFI_MAC_ADDRESS                      *SrcAddr  OPTIONAL,
588   IN EFI_MAC_ADDRESS                      *DestAddr OPTIONAL,
589   IN UINT16                               *Protocol OPTIONAL
590   );
591 
592 /**
593   Receives a packet from a network interface.
594 
595   @param  This       The protocol instance pointer.
596   @param  HeaderSize The size, in bytes, of the media header received on the network
597                      interface. If this parameter is NULL, then the media header size
598                      will not be returned.
599   @param  BufferSize On entry, the size, in bytes, of Buffer. On exit, the size, in
600                      bytes, of the packet that was received on the network interface.
601   @param  Buffer     A pointer to the data buffer to receive both the media header and
602                      the data.
603   @param  SrcAddr    The source HW MAC address. If this parameter is NULL, the
604                      HW MAC source address will not be extracted from the media
605                      header.
606   @param  DestAddr   The destination HW MAC address. If this parameter is NULL,
607                      the HW MAC destination address will not be extracted from the
608                      media header.
609   @param  Protocol   The media header type. If this parameter is NULL, then the
610                      protocol will not be extracted from the media header. See
611                      RFC 1700 section "Ether Types" for examples.
612 
613   @retval  EFI_SUCCESS           The received data was stored in Buffer, and BufferSize has
614                                  been updated to the number of bytes received.
615   @retval  EFI_NOT_STARTED       The network interface has not been started.
616   @retval  EFI_NOT_READY         The network interface is too busy to accept this transmit
617                                  request.
618   @retval  EFI_BUFFER_TOO_SMALL  The BufferSize parameter is too small.
619   @retval  EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
620   @retval  EFI_DEVICE_ERROR      The command could not be sent to the network interface.
621   @retval  EFI_UNSUPPORTED       This function is not supported by the network interface.
622 
623 **/
624 typedef
625 EFI_STATUS
626 (EFIAPI *EFI_SIMPLE_NETWORK_RECEIVE)(
627   IN EFI_SIMPLE_NETWORK_PROTOCOL          *This,
628   OUT UINTN                               *HeaderSize OPTIONAL,
629   IN OUT UINTN                            *BufferSize,
630   OUT VOID                                *Buffer,
631   OUT EFI_MAC_ADDRESS                     *SrcAddr    OPTIONAL,
632   OUT EFI_MAC_ADDRESS                     *DestAddr   OPTIONAL,
633   OUT UINT16                              *Protocol   OPTIONAL
634   );
635 
636 #define EFI_SIMPLE_NETWORK_PROTOCOL_REVISION  0x00010000
637 
638 //
639 // Revision defined in EFI1.1
640 //
641 #define EFI_SIMPLE_NETWORK_INTERFACE_REVISION   EFI_SIMPLE_NETWORK_PROTOCOL_REVISION
642 
643 ///
644 /// The EFI_SIMPLE_NETWORK_PROTOCOL protocol is used to initialize access
645 /// to a network adapter. Once the network adapter initializes,
646 /// the EFI_SIMPLE_NETWORK_PROTOCOL protocol provides services that
647 /// allow packets to be transmitted and received.
648 ///
649 struct _EFI_SIMPLE_NETWORK_PROTOCOL {
650   ///
651   /// Revision of the EFI_SIMPLE_NETWORK_PROTOCOL. All future revisions must
652   /// be backwards compatible. If a future version is not backwards compatible
653   /// it is not the same GUID.
654   ///
655   UINT64                              Revision;
656   EFI_SIMPLE_NETWORK_START            Start;
657   EFI_SIMPLE_NETWORK_STOP             Stop;
658   EFI_SIMPLE_NETWORK_INITIALIZE       Initialize;
659   EFI_SIMPLE_NETWORK_RESET            Reset;
660   EFI_SIMPLE_NETWORK_SHUTDOWN         Shutdown;
661   EFI_SIMPLE_NETWORK_RECEIVE_FILTERS  ReceiveFilters;
662   EFI_SIMPLE_NETWORK_STATION_ADDRESS  StationAddress;
663   EFI_SIMPLE_NETWORK_STATISTICS       Statistics;
664   EFI_SIMPLE_NETWORK_MCAST_IP_TO_MAC  MCastIpToMac;
665   EFI_SIMPLE_NETWORK_NVDATA           NvData;
666   EFI_SIMPLE_NETWORK_GET_STATUS       GetStatus;
667   EFI_SIMPLE_NETWORK_TRANSMIT         Transmit;
668   EFI_SIMPLE_NETWORK_RECEIVE          Receive;
669   ///
670   /// Event used with WaitForEvent() to wait for a packet to be received.
671   ///
672   EFI_EVENT                           WaitForPacket;
673   ///
674   /// Pointer to the EFI_SIMPLE_NETWORK_MODE data for the device.
675   ///
676   EFI_SIMPLE_NETWORK_MODE             *Mode;
677 };
678 
679 extern EFI_GUID gEfiSimpleNetworkProtocolGuid;
680 
681 #endif
682