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   Copyright (c) 2017, AMD Inc, All rights reserved.<BR>
   8
   9   This program and the accompanying materials are licensed and made available
  10   under the terms and conditions of the BSD License which accompanies this
  11   distribution. The full text of the license may be found at
  12   http://opensource.org/licenses/bsd-license.php
  13
  14   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
  15   WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  16
  17 **/
  18
  19 #include <Library/UefiBootServicesTableLib.h>
  20
  21 #include "VirtioNet.h"
  22
  23 /**
  24   Resets a network adapter and leaves it in a state that is safe for  another
  25   driver to initialize.
  26
  27   @param  This Protocol instance pointer.
  28
  29   @retval EFI_SUCCESS           The network interface was shutdown.
  30   @retval EFI_NOT_STARTED       The network interface has not been started.
  31   @retval EFI_INVALID_PARAMETER One or more of the parameters has an
  32                                 unsupported value.
  33   @retval EFI_DEVICE_ERROR      The command could not be sent to the network
  34                                 interface.
  35   @retval EFI_UNSUPPORTED       This function is not supported by the network
  36                                 interface.
  37
  38 **/
  39
  40 EFI_STATUS
  41 EFIAPI
  42 VirtioNetShutdown (
  43   IN EFI_SIMPLE_NETWORK_PROTOCOL *This
  44   )
  45 {
  46   VNET_DEV   *Dev;
  47   EFI_TPL    OldTpl;
  48   EFI_STATUS Status;
  49
  50   if (This == NULL) {
  51     return EFI_INVALID_PARAMETER;
  52   }
  53
  54   Dev = VIRTIO_NET_FROM_SNP (This);
  55   OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
  56   switch (Dev->Snm.State) {
  57   case EfiSimpleNetworkStopped:
  58     Status = EFI_NOT_STARTED;
  59     goto Exit;
  60   case EfiSimpleNetworkStarted:
  61     Status = EFI_DEVICE_ERROR;
  62     goto Exit;
  63   default:
  64     break;
  65   }
  66
  67   Dev->VirtIo->SetDeviceStatus (Dev->VirtIo, 0);
  68   VirtioNetShutdownRx (Dev);
  69   VirtioNetShutdownTx (Dev);
  70   VirtioRingUninit (Dev->VirtIo, &Dev->TxRing);
  71   VirtioRingUninit (Dev->VirtIo, &Dev->RxRing);
  72
  73   Dev->Snm.State = EfiSimpleNetworkStarted;
  74   Status = EFI_SUCCESS;
  75
  76 Exit:
  77   gBS->RestoreTPL (OldTpl);
  78   return Status;
  79 }