OvmfPkg/VirtioNetDxe/SnpShutdown.c

   1 /** @file
   2
   3   Implementation of the SNP.Shutdown() function and its private helpers if any.
   4
   5   Copyright (C) 2013, Red Hat, Inc.
   6   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
   7
   8   This program and the accompanying materials are licensed and made available
   9   under the terms and conditions of the BSD License which accompanies this
  10   distribution. The full text of the license may be found at
  11   http://opensource.org/licenses/bsd-license.php
  12
  13   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
  14   WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  15
  16 **/
  17
  18 #include <Library/UefiBootServicesTableLib.h>
  19
  20 #include "VirtioNet.h"
  21
  22 /**
  23   Resets a network adapter and leaves it in a state that is safe for  another
  24   driver to initialize.
  25
  26   @param  This Protocol instance pointer.
  27
  28   @retval EFI_SUCCESS           The network interface was shutdown.
  29   @retval EFI_NOT_STARTED       The network interface has not been started.
  30   @retval EFI_INVALID_PARAMETER One or more of the parameters has an
  31                                 unsupported value.
  32   @retval EFI_DEVICE_ERROR      The command could not be sent to the network
  33                                 interface.
  34   @retval EFI_UNSUPPORTED       This function is not supported by the network
  35                                 interface.
  36
  37 **/
  38
  39 EFI_STATUS
  40 EFIAPI
  41 VirtioNetShutdown (
  42   IN EFI_SIMPLE_NETWORK_PROTOCOL *This
  43   )
  44 {
  45   VNET_DEV   *Dev;
  46   EFI_TPL    OldTpl;
  47   EFI_STATUS Status;
  48
  49   if (This == NULL) {
  50     return EFI_INVALID_PARAMETER;
  51   }
  52
  53   Dev = VIRTIO_NET_FROM_SNP (This);
  54   OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
  55   switch (Dev->Snm.State) {
  56   case EfiSimpleNetworkStopped:
  57     Status = EFI_NOT_STARTED;
  58     goto Exit;
  59   case EfiSimpleNetworkStarted:
  60     Status = EFI_DEVICE_ERROR;
  61     goto Exit;
  62   default:
  63     break;
  64   }
  65
  66   Dev->VirtIo->SetDeviceStatus (Dev->VirtIo, 0);
  67   VirtioNetShutdownRx (Dev);
  68   VirtioNetShutdownTx (Dev);
  69   VirtioRingUninit (&Dev->TxRing);
  70   VirtioRingUninit (&Dev->RxRing);
  71
  72   Dev->Snm.State = EfiSimpleNetworkStarted;
  73   Status = EFI_SUCCESS;
  74
  75 Exit:
  76   gBS->RestoreTPL (OldTpl);
  77   return Status;
  78 }