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   SPDX-License-Identifier: BSD-2-Clause-Patent
   9
  10 **/
  11
  12 #include <Library/UefiBootServicesTableLib.h>
  13
  14 #include "VirtioNet.h"
  15
  16 /**
  17   Changes the state of a network interface from "stopped" to "started".
  18
  19   @param  This Protocol instance pointer.
  20
  21   @retval EFI_SUCCESS           The network interface was started.
  22   @retval EFI_ALREADY_STARTED   The network interface is already in the started
  23                                 state.
  24   @retval EFI_INVALID_PARAMETER One or more of the parameters has an
  25                                 unsupported value.
  26   @retval EFI_DEVICE_ERROR      The command could not be sent to the network
  27                                 interface.
  28   @retval EFI_UNSUPPORTED       This function is not supported by the network
  29                                 interface.
  30 **/
  31
  32 EFI_STATUS
  33 EFIAPI
  34 VirtioNetStart (
  35   IN EFI_SIMPLE_NETWORK_PROTOCOL *This
  36   )
  37 {
  38   VNET_DEV   *Dev;
  39   EFI_TPL    OldTpl;
  40   EFI_STATUS Status;
  41
  42   if (This == NULL) {
  43     return EFI_INVALID_PARAMETER;
  44   }
  45
  46   Dev = VIRTIO_NET_FROM_SNP (This);
  47   OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
  48   if (Dev->Snm.State != EfiSimpleNetworkStopped) {
  49     Status = EFI_ALREADY_STARTED;
  50   }
  51   else {
  52     Dev->Snm.State = EfiSimpleNetworkStarted;
  53     Status = EFI_SUCCESS;
  54   }
  55
  56   gBS->RestoreTPL (OldTpl);
  57   return Status;
  58 }