OvmfPkg/VirtioNetDxe/SnpStart.c

   1 /** @file
   2
   3   Implementation of the SNP.Start() 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   Changes the state of a network interface from "stopped" to "started".
  24
  25   @param  This Protocol instance pointer.
  26
  27   @retval EFI_SUCCESS           The network interface was started.
  28   @retval EFI_ALREADY_STARTED   The network interface is already in the started
  29                                 state.
  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 EFI_STATUS
  39 EFIAPI
  40 VirtioNetStart (
  41   IN EFI_SIMPLE_NETWORK_PROTOCOL *This
  42   )
  43 {
  44   VNET_DEV   *Dev;
  45   EFI_TPL    OldTpl;
  46   EFI_STATUS Status;
  47
  48   if (This == NULL) {
  49     return EFI_INVALID_PARAMETER;
  50   }
  51
  52   Dev = VIRTIO_NET_FROM_SNP (This);
  53   OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
  54   if (Dev->Snm.State != EfiSimpleNetworkStopped) {
  55     Status = EFI_ALREADY_STARTED;
  56   }
  57   else {
  58     Dev->Snm.State = EfiSimpleNetworkStarted;
  59     Status = EFI_SUCCESS;
  60   }
  61
  62   gBS->RestoreTPL (OldTpl);
  63   return Status;
  64 }