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   SPDX-License-Identifier: BSD-2-Clause-Patent
  10
  11 **/
  12
  13 #include <Library/UefiBootServicesTableLib.h>
  14
  15 #include "VirtioNet.h"
  16
  17 /**
  18   Resets a network adapter and leaves it in a state that is safe for  another
  19   driver to initialize.
  20
  21   @param  This Protocol instance pointer.
  22
  23   @retval EFI_SUCCESS           The network interface was shutdown.
  24   @retval EFI_NOT_STARTED       The network interface has not been started.
  25   @retval EFI_INVALID_PARAMETER One or more of the parameters has an
  26                                 unsupported value.
  27   @retval EFI_DEVICE_ERROR      The command could not be sent to the network
  28                                 interface.
  29   @retval EFI_UNSUPPORTED       This function is not supported by the network
  30                                 interface.
  31
  32 **/
  33 EFI_STATUS
  34 EFIAPI
  35 VirtioNetShutdown (
  36   IN EFI_SIMPLE_NETWORK_PROTOCOL  *This
  37   )
  38 {
  39   VNET_DEV    *Dev;
  40   EFI_TPL     OldTpl;
  41   EFI_STATUS  Status;
  42
  43   if (This == NULL) {
  44     return EFI_INVALID_PARAMETER;
  45   }
  46
  47   Dev    = VIRTIO_NET_FROM_SNP (This);
  48   OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
  49   switch (Dev->Snm.State) {
  50     case EfiSimpleNetworkStopped:
  51       Status = EFI_NOT_STARTED;
  52       goto Exit;
  53     case EfiSimpleNetworkStarted:
  54       Status = EFI_DEVICE_ERROR;
  55       goto Exit;
  56     default:
  57       break;
  58   }
  59
  60   Dev->VirtIo->SetDeviceStatus (Dev->VirtIo, 0);
  61   VirtioNetShutdownRx (Dev);
  62   VirtioNetShutdownTx (Dev);
  63   VirtioNetUninitRing (Dev, &Dev->TxRing, Dev->TxRingMap);
  64   VirtioNetUninitRing (Dev, &Dev->RxRing, Dev->RxRingMap);
  65
  66   Dev->Snm.State = EfiSimpleNetworkStarted;
  67   Status         = EFI_SUCCESS;
  68
  69 Exit:
  70   gBS->RestoreTPL (OldTpl);
  71   return Status;
  72 }