2 Implementation of Managed Network Protocol public services.
4 Copyright (c) 2005 - 2016, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions
7 of the BSD License which accompanies this distribution. The full
8 text of the license may be found at<BR>
9 http://opensource.org/licenses/bsd-license.php
11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
19 Returns the operational parameters for the current MNP child driver. May also
20 support returning the underlying SNP driver mode data.
22 The GetModeData() function is used to read the current mode data (operational
23 parameters) from the MNP or the underlying SNP.
25 @param[in] This Pointer to the EFI_MANAGED_NETWORK_PROTOCOL instance.
26 @param[out] MnpConfigData Pointer to storage for MNP operational parameters. Type
27 EFI_MANAGED_NETWORK_CONFIG_DATA is defined in "Related
29 @param[out] SnpModeData Pointer to storage for SNP operational parameters. This
30 feature may be unsupported. Type EFI_SIMPLE_NETWORK_MODE
31 is defined in the EFI_SIMPLE_NETWORK_PROTOCOL.
33 @retval EFI_SUCCESS The operation completed successfully.
34 @retval EFI_INVALID_PARAMETER This is NULL.
35 @retval EFI_UNSUPPORTED The requested feature is unsupported in this
37 @retval EFI_NOT_STARTED This MNP child driver instance has not been
38 configured. The default values are returned in
39 MnpConfigData if it is not NULL.
40 @retval Others The mode data could not be read.
46 IN EFI_MANAGED_NETWORK_PROTOCOL
*This
,
47 OUT EFI_MANAGED_NETWORK_CONFIG_DATA
*MnpConfigData OPTIONAL
,
48 OUT EFI_SIMPLE_NETWORK_MODE
*SnpModeData OPTIONAL
51 MNP_INSTANCE_DATA
*Instance
;
52 EFI_SIMPLE_NETWORK_PROTOCOL
*Snp
;
55 UINT32 InterruptStatus
;
58 return EFI_INVALID_PARAMETER
;
61 Instance
= MNP_INSTANCE_DATA_FROM_THIS (This
);
63 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
65 if (MnpConfigData
!= NULL
) {
67 // Copy the instance configuration data.
69 CopyMem (MnpConfigData
, &Instance
->ConfigData
, sizeof (*MnpConfigData
));
72 if (SnpModeData
!= NULL
) {
74 // Copy the underlayer Snp mode data.
76 Snp
= Instance
->MnpServiceData
->MnpDeviceData
->Snp
;
79 // Upon successful return of GetStatus(), the Snp->Mode->MediaPresent
80 // will be updated to reflect any change of media status
82 Snp
->GetStatus (Snp
, &InterruptStatus
, NULL
);
83 CopyMem (SnpModeData
, Snp
->Mode
, sizeof (*SnpModeData
));
86 if (!Instance
->Configured
) {
87 Status
= EFI_NOT_STARTED
;
92 gBS
->RestoreTPL (OldTpl
);
99 Sets or clears the operational parameters for the MNP child driver.
101 The Configure() function is used to set, change, or reset the operational
102 parameters for the MNP child driver instance. Until the operational parameters
103 have been set, no network traffic can be sent or received by this MNP child
104 driver instance. Once the operational parameters have been reset, no more
105 traffic can be sent or received until the operational parameters have been set
107 Each MNP child driver instance can be started and stopped independently of
108 each other by setting or resetting their receive filter settings with the
109 Configure() function.
110 After any successful call to Configure(), the MNP child driver instance is
111 started. The internal periodic timer (if supported) is enabled. Data can be
112 transmitted and may be received if the receive filters have also been enabled.
113 Note: If multiple MNP child driver instances will receive the same packet
114 because of overlapping receive filter settings, then the first MNP child
115 driver instance will receive the original packet and additional instances will
116 receive copies of the original packet.
117 Note: Warning: Receive filter settings that overlap will consume extra
118 processor and/or DMA resources and degrade system and network performance.
120 @param[in] This Pointer to the EFI_MANAGED_NETWORK_PROTOCOL instance.
121 @param[in] MnpConfigData Pointer to configuration data that will be assigned
122 to the MNP child driver instance. If NULL, the MNP
123 child driver instance is reset to startup defaults
124 and all pending transmit and receive requests are
125 flushed. Type EFI_MANAGED_NETWORK_CONFIG_DATA is
126 defined in EFI_MANAGED_NETWORK_PROTOCOL.GetModeData().
128 @retval EFI_SUCCESS The operation completed successfully.
129 @retval EFI_INVALID_PARAMETER One or more of the following conditions is
132 * MnpConfigData.ProtocolTypeFilter is not
134 The operational data for the MNP child driver
135 instance is unchanged.
136 @retval EFI_OUT_OF_RESOURCES Required system resources (usually memory)
137 could not be allocated.
138 The MNP child driver instance has been reset to
140 @retval EFI_UNSUPPORTED The requested feature is unsupported in
141 this [MNP] implementation. The operational data
142 for the MNP child driver instance is unchanged.
143 @retval EFI_DEVICE_ERROR An unexpected network or system error
144 occurred. The MNP child driver instance has
145 been reset to startup defaults.
146 @retval Others The MNP child driver instance has been reset to
153 IN EFI_MANAGED_NETWORK_PROTOCOL
*This
,
154 IN EFI_MANAGED_NETWORK_CONFIG_DATA
*MnpConfigData OPTIONAL
157 MNP_INSTANCE_DATA
*Instance
;
161 if ((This
== NULL
) ||
162 ((MnpConfigData
!= NULL
) &&
163 (MnpConfigData
->ProtocolTypeFilter
> 0) &&
164 (MnpConfigData
->ProtocolTypeFilter
<= 1500))
166 return EFI_INVALID_PARAMETER
;
169 Instance
= MNP_INSTANCE_DATA_FROM_THIS (This
);
171 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
173 if ((MnpConfigData
== NULL
) && (!Instance
->Configured
)) {
175 // If the instance is not configured and a reset is requested, just return.
177 Status
= EFI_SUCCESS
;
182 // Configure the instance.
184 Status
= MnpConfigureInstance (Instance
, MnpConfigData
);
187 gBS
->RestoreTPL (OldTpl
);
194 Translates an IP multicast address to a hardware (MAC) multicast address. This
195 function may be unsupported in some MNP implementations.
197 The McastIpToMac() function translates an IP multicast address to a hardware
198 (MAC) multicast address. This function may be implemented by calling the
199 underlying EFI_SIMPLE_NETWORK. MCastIpToMac() function, which may also be
200 unsupported in some MNP implementations.
202 @param[in] This Pointer to the EFI_MANAGED_NETWORK_PROTOCOL instance.
203 @param[in] Ipv6Flag Set to TRUE to if IpAddress is an IPv6 multicast address.
204 Set to FALSE if IpAddress is an IPv4 multicast address.
205 @param[in] IpAddress Pointer to the multicast IP address (in network byte
207 @param[out] MacAddress Pointer to the resulting multicast MAC address.
209 @retval EFI_SUCCESS The operation completed successfully.
210 @retval EFI_INVALID_PARAMETER One of the following conditions is TRUE:
213 * IpAddress is not a valid multicast IP
215 * MacAddress is NULL.
216 @retval EFI_NOT_STARTED This MNP child driver instance has not been
218 @retval EFI_UNSUPPORTED The requested feature is unsupported in this
220 @retval EFI_DEVICE_ERROR An unexpected network or system error occurred.
221 @retval Others The address could not be converted.
226 IN EFI_MANAGED_NETWORK_PROTOCOL
*This
,
228 IN EFI_IP_ADDRESS
*IpAddress
,
229 OUT EFI_MAC_ADDRESS
*MacAddress
233 MNP_INSTANCE_DATA
*Instance
;
234 EFI_SIMPLE_NETWORK_PROTOCOL
*Snp
;
236 EFI_IPv6_ADDRESS
*Ip6Address
;
238 if ((This
== NULL
) || (IpAddress
== NULL
) || (MacAddress
== NULL
)) {
239 return EFI_INVALID_PARAMETER
;
242 Ip6Address
= &IpAddress
->v6
;
244 if ((Ipv6Flag
&& !IP6_IS_MULTICAST (Ip6Address
)) ||
245 (!Ipv6Flag
&& !IP4_IS_MULTICAST (EFI_NTOHL (*IpAddress
)))
248 // The IP address passed in is not a multicast address.
250 return EFI_INVALID_PARAMETER
;
253 Instance
= MNP_INSTANCE_DATA_FROM_THIS (This
);
255 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
257 if (!Instance
->Configured
) {
259 Status
= EFI_NOT_STARTED
;
263 Snp
= Instance
->MnpServiceData
->MnpDeviceData
->Snp
;
264 ASSERT (Snp
!= NULL
);
266 ZeroMem (MacAddress
, sizeof (EFI_MAC_ADDRESS
));
268 if (Snp
->Mode
->IfType
== NET_IFTYPE_ETHERNET
) {
271 // Translate the IPv4 address into a multicast MAC address if the NIC is an
272 // ethernet NIC according to RFC1112..
274 MacAddress
->Addr
[0] = 0x01;
275 MacAddress
->Addr
[1] = 0x00;
276 MacAddress
->Addr
[2] = 0x5E;
277 MacAddress
->Addr
[3] = (UINT8
) (IpAddress
->v4
.Addr
[1] & 0x7F);
278 MacAddress
->Addr
[4] = IpAddress
->v4
.Addr
[2];
279 MacAddress
->Addr
[5] = IpAddress
->v4
.Addr
[3];
282 // Translate the IPv6 address into a multicast MAC address if the NIC is an
283 // ethernet NIC according to RFC2464.
286 MacAddress
->Addr
[0] = 0x33;
287 MacAddress
->Addr
[1] = 0x33;
288 MacAddress
->Addr
[2] = Ip6Address
->Addr
[12];
289 MacAddress
->Addr
[3] = Ip6Address
->Addr
[13];
290 MacAddress
->Addr
[4] = Ip6Address
->Addr
[14];
291 MacAddress
->Addr
[5] = Ip6Address
->Addr
[15];
294 Status
= EFI_SUCCESS
;
297 // Invoke Snp to translate the multicast IP address.
299 Status
= Snp
->MCastIpToMac (
308 gBS
->RestoreTPL (OldTpl
);
314 Enables and disables receive filters for multicast address. This function may
315 be unsupported in some MNP implementations.
317 The Groups() function only adds and removes multicast MAC addresses from the
318 filter list. The MNP driver does not transmit or process Internet Group
319 Management Protocol (IGMP) packets. If JoinFlag is FALSE and MacAddress is
320 NULL, then all joined groups are left.
322 @param[in] This Pointer to the EFI_MANAGED_NETWORK_PROTOCOL instance.
323 @param[in] JoinFlag Set to TRUE to join this multicast group.
324 Set to FALSE to leave this multicast group.
325 @param[in] MacAddress Pointer to the multicast MAC group (address) to join or
328 @retval EFI_SUCCESS The requested operation completed successfully.
329 @retval EFI_INVALID_PARAMETER One or more of the following conditions is TRUE:
331 * JoinFlag is TRUE and MacAddress is NULL.
332 * MacAddress is not a valid multicast MAC
334 * The MNP multicast group settings are
336 @retval EFI_NOT_STARTED This MNP child driver instance has not been
338 @retval EFI_ALREADY_STARTED The supplied multicast group is already joined.
339 @retval EFI_NOT_FOUND The supplied multicast group is not joined.
340 @retval EFI_DEVICE_ERROR An unexpected network or system error occurred.
341 The MNP child driver instance has been reset to
343 @retval EFI_UNSUPPORTED The requested feature is unsupported in this MNP
345 @retval Others The requested operation could not be completed.
346 The MNP multicast group settings are unchanged.
352 IN EFI_MANAGED_NETWORK_PROTOCOL
*This
,
354 IN EFI_MAC_ADDRESS
*MacAddress OPTIONAL
357 MNP_INSTANCE_DATA
*Instance
;
358 EFI_SIMPLE_NETWORK_MODE
*SnpMode
;
359 MNP_GROUP_CONTROL_BLOCK
*GroupCtrlBlk
;
360 MNP_GROUP_ADDRESS
*GroupAddress
;
361 LIST_ENTRY
*ListEntry
;
362 BOOLEAN AddressExist
;
366 if (This
== NULL
|| (JoinFlag
&& (MacAddress
== NULL
))) {
368 // This is NULL, or it's a join operation but MacAddress is NULL.
370 return EFI_INVALID_PARAMETER
;
373 Instance
= MNP_INSTANCE_DATA_FROM_THIS (This
);
374 SnpMode
= Instance
->MnpServiceData
->MnpDeviceData
->Snp
->Mode
;
376 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
378 if (!Instance
->Configured
) {
379 Status
= EFI_NOT_STARTED
;
383 if ((!Instance
->ConfigData
.EnableMulticastReceive
) ||
384 ((MacAddress
!= NULL
) && !NET_MAC_IS_MULTICAST (MacAddress
, &SnpMode
->BroadcastAddress
, SnpMode
->HwAddressSize
))) {
386 // The instance isn't configured to do mulitcast receive. OR
387 // the passed in MacAddress is not a mutlticast mac address.
389 Status
= EFI_INVALID_PARAMETER
;
393 Status
= EFI_SUCCESS
;
394 AddressExist
= FALSE
;
397 if (MacAddress
!= NULL
) {
399 // Search the instance's GroupCtrlBlkList to find the specific address.
401 NET_LIST_FOR_EACH (ListEntry
, &Instance
->GroupCtrlBlkList
) {
403 GroupCtrlBlk
= NET_LIST_USER_STRUCT (
405 MNP_GROUP_CONTROL_BLOCK
,
408 GroupAddress
= GroupCtrlBlk
->GroupAddress
;
409 if (0 == CompareMem (
411 &GroupAddress
->Address
,
412 SnpMode
->HwAddressSize
415 // There is already the same multicast mac address configured.
422 if (JoinFlag
&& AddressExist
) {
424 // The multicast mac address to join already exists.
426 Status
= EFI_ALREADY_STARTED
;
429 if (!JoinFlag
&& !AddressExist
) {
431 // The multicast mac address to leave doesn't exist in this instance.
433 Status
= EFI_NOT_FOUND
;
436 if (EFI_ERROR (Status
)) {
439 } else if (IsListEmpty (&Instance
->GroupCtrlBlkList
)) {
441 // The MacAddress is NULL and there is no configured multicast mac address,
448 // OK, it is time to take action.
450 Status
= MnpGroupOp (Instance
, JoinFlag
, MacAddress
, GroupCtrlBlk
);
453 gBS
->RestoreTPL (OldTpl
);
459 Places asynchronous outgoing data packets into the transmit queue.
461 The Transmit() function places a completion token into the transmit packet
462 queue. This function is always asynchronous.
463 The caller must fill in the Token.Event and Token.TxData fields in the
464 completion token, and these fields cannot be NULL. When the transmit operation
465 completes, the MNP updates the Token.Status field and the Token.Event is
467 Note: There may be a performance penalty if the packet needs to be
468 defragmented before it can be transmitted by the network device. Systems in
469 which performance is critical should review the requirements and features of
470 the underlying communications device and drivers.
473 @param[in] This Pointer to the EFI_MANAGED_NETWORK_PROTOCOL instance.
474 @param[in] Token Pointer to a token associated with the transmit data
475 descriptor. Type EFI_MANAGED_NETWORK_COMPLETION_TOKEN
476 is defined in "Related Definitions" below.
478 @retval EFI_SUCCESS The transmit completion token was cached.
479 @retval EFI_NOT_STARTED This MNP child driver instance has not been
481 @retval EFI_INVALID_PARAMETER One or more of the following conditions is
485 * Token.Event is NULL.
486 * Token.TxData is NULL.
487 * Token.TxData.DestinationAddress is not
488 NULL and Token.TxData.HeaderLength is zero.
489 * Token.TxData.FragmentCount is zero.
490 * (Token.TxData.HeaderLength +
491 Token.TxData.DataLength) is not equal to the
493 Token.TxData.FragmentTable[].FragmentLength
496 Token.TxData.FragmentTable[].FragmentLength
499 Token.TxData.FragmentTable[].FragmentBufferfields
501 * Token.TxData.DataLength is greater than MTU.
502 @retval EFI_ACCESS_DENIED The transmit completion token is already in the
504 @retval EFI_OUT_OF_RESOURCES The transmit data could not be queued due to a
505 lack of system resources (usually memory).
506 @retval EFI_DEVICE_ERROR An unexpected system or network error occurred.
507 The MNP child driver instance has been reset to
509 @retval EFI_NOT_READY The transmit request could not be queued because
510 the transmit queue is full.
516 IN EFI_MANAGED_NETWORK_PROTOCOL
*This
,
517 IN EFI_MANAGED_NETWORK_COMPLETION_TOKEN
*Token
521 MNP_INSTANCE_DATA
*Instance
;
522 MNP_SERVICE_DATA
*MnpServiceData
;
527 if ((This
== NULL
) || (Token
== NULL
)) {
528 return EFI_INVALID_PARAMETER
;
531 Instance
= MNP_INSTANCE_DATA_FROM_THIS (This
);
533 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
535 if (!Instance
->Configured
) {
537 Status
= EFI_NOT_STARTED
;
541 if (!MnpIsValidTxToken (Instance
, Token
)) {
543 // The Token is invalid.
545 Status
= EFI_INVALID_PARAMETER
;
549 MnpServiceData
= Instance
->MnpServiceData
;
550 NET_CHECK_SIGNATURE (MnpServiceData
, MNP_SERVICE_DATA_SIGNATURE
);
553 // Build the tx packet
555 Status
= MnpBuildTxPacket (MnpServiceData
, Token
->Packet
.TxData
, &PktBuf
, &PktLen
);
556 if (EFI_ERROR (Status
)) {
561 // OK, send the packet synchronously.
563 Status
= MnpSyncSendPacket (MnpServiceData
, PktBuf
, PktLen
, Token
);
566 gBS
->RestoreTPL (OldTpl
);
573 Places an asynchronous receiving request into the receiving queue.
575 The Receive() function places a completion token into the receive packet
576 queue. This function is always asynchronous.
577 The caller must fill in the Token.Event field in the completion token, and
578 this field cannot be NULL. When the receive operation completes, the MNP
579 updates the Token.Status and Token.RxData fields and the Token.Event is
582 @param[in] This Pointer to the EFI_MANAGED_NETWORK_PROTOCOL instance.
583 @param[in] Token Pointer to a token associated with the receive
584 data descriptor. Type
585 EFI_MANAGED_NETWORK_COMPLETION_TOKEN is defined in
586 EFI_MANAGED_NETWORK_PROTOCOL.Transmit().
588 @retval EFI_SUCCESS The receive completion token was cached.
589 @retval EFI_NOT_STARTED This MNP child driver instance has not been
591 @retval EFI_INVALID_PARAMETER One or more of the following conditions is
595 * Token.Event is NULL
596 @retval EFI_OUT_OF_RESOURCES The transmit data could not be queued due to a
597 lack of system resources (usually memory).
598 @retval EFI_DEVICE_ERROR An unexpected system or network error occurred.
599 The MNP child driver instance has been reset to
601 @retval EFI_ACCESS_DENIED The receive completion token was already in the
603 @retval EFI_NOT_READY The receive request could not be queued because
604 the receive queue is full.
610 IN EFI_MANAGED_NETWORK_PROTOCOL
*This
,
611 IN EFI_MANAGED_NETWORK_COMPLETION_TOKEN
*Token
615 MNP_INSTANCE_DATA
*Instance
;
618 if ((This
== NULL
) || (Token
== NULL
) || (Token
->Event
== NULL
)) {
619 return EFI_INVALID_PARAMETER
;
622 Instance
= MNP_INSTANCE_DATA_FROM_THIS (This
);
624 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
626 if (!Instance
->Configured
) {
627 Status
= EFI_NOT_STARTED
;
632 // Check whether this token(event) is already in the rx token queue.
634 Status
= NetMapIterate (&Instance
->RxTokenMap
, MnpTokenExist
, (VOID
*) Token
);
635 if (EFI_ERROR (Status
)) {
640 // Insert the Token into the RxTokenMap.
642 Status
= NetMapInsertTail (&Instance
->RxTokenMap
, (VOID
*) Token
, NULL
);
643 if (!EFI_ERROR (Status
)) {
645 // Try to deliver any buffered packets.
647 Status
= MnpInstanceDeliverPacket (Instance
);
650 // Dispatch the DPC queued by the NotifyFunction of Token->Event.
656 gBS
->RestoreTPL (OldTpl
);
662 Aborts an asynchronous transmit or receive request.
664 The Cancel() function is used to abort a pending transmit or receive request.
665 If the token is in the transmit or receive request queues, after calling this
666 function, Token.Status will be set to EFI_ABORTED and then Token.Event will be
667 signaled. If the token is not in one of the queues, which usually means that
668 the asynchronous operation has completed, this function will not signal the
669 token and EFI_NOT_FOUND is returned.
671 @param[in] This Pointer to the EFI_MANAGED_NETWORK_PROTOCOL instance.
672 @param[in] Token Pointer to a token that has been issued by
673 EFI_MANAGED_NETWORK_PROTOCOL.Transmit() or
674 EFI_MANAGED_NETWORK_PROTOCOL.Receive(). If NULL, all
675 pending tokens are aborted.
677 @retval EFI_SUCCESS The asynchronous I/O request was aborted and
678 Token.Event was signaled. When Token is NULL,
679 all pending requests were aborted and their
680 events were signaled.
681 @retval EFI_NOT_STARTED This MNP child driver instance has not been
683 @retval EFI_INVALID_PARAMETER This is NULL.
684 @retval EFI_NOT_FOUND When Token is not NULL, the asynchronous I/O
685 request was not found in the transmit or
686 receive queue. It has either completed or was
687 not issued by Transmit() and Receive().
693 IN EFI_MANAGED_NETWORK_PROTOCOL
*This
,
694 IN EFI_MANAGED_NETWORK_COMPLETION_TOKEN
*Token OPTIONAL
698 MNP_INSTANCE_DATA
*Instance
;
702 return EFI_INVALID_PARAMETER
;
705 Instance
= MNP_INSTANCE_DATA_FROM_THIS (This
);
707 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
709 if (!Instance
->Configured
) {
710 Status
= EFI_NOT_STARTED
;
715 // Iterate the RxTokenMap to cancel the specified Token.
717 Status
= NetMapIterate (&Instance
->RxTokenMap
, MnpCancelTokens
, (VOID
*) Token
);
719 Status
= (Status
== EFI_ABORTED
) ? EFI_SUCCESS
: EFI_NOT_FOUND
;
723 // Dispatch the DPC queued by the NotifyFunction of the cancled token's events.
728 gBS
->RestoreTPL (OldTpl
);
734 Polls for incoming data packets and processes outgoing data packets.
736 The Poll() function can be used by network drivers and applications to
737 increase the rate that data packets are moved between the communications
738 device and the transmit and receive queues.
739 Normally, a periodic timer event internally calls the Poll() function. But, in
740 some systems, the periodic timer event may not call Poll() fast enough to
741 transmit and/or receive all data packets without missing packets. Drivers and
742 applications that are experiencing packet loss should try calling the Poll()
745 @param[in] This Pointer to the EFI_MANAGED_NETWORK_PROTOCOL instance.
747 @retval EFI_SUCCESS Incoming or outgoing data was processed.
748 @retval EFI_NOT_STARTED This MNP child driver instance has not been
750 @retval EFI_DEVICE_ERROR An unexpected system or network error occurred. The
751 MNP child driver instance has been reset to startup
753 @retval EFI_NOT_READY No incoming or outgoing data was processed. Consider
754 increasing the polling rate.
755 @retval EFI_TIMEOUT Data was dropped out of the transmit and/or receive
756 queue. Consider increasing the polling rate.
762 IN EFI_MANAGED_NETWORK_PROTOCOL
*This
766 MNP_INSTANCE_DATA
*Instance
;
770 return EFI_INVALID_PARAMETER
;
773 Instance
= MNP_INSTANCE_DATA_FROM_THIS (This
);
775 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
777 if (!Instance
->Configured
) {
778 Status
= EFI_NOT_STARTED
;
783 // Try to receive packets.
785 Status
= MnpReceivePacket (Instance
->MnpServiceData
->MnpDeviceData
);
788 // Dispatch the DPC queued by the NotifyFunction of rx token's events.
793 gBS
->RestoreTPL (OldTpl
);