OvmfPkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / OvmfPkg / VirtioNetDxe / SnpStart.c

/** @file\r
\r
  Implementation of the SNP.Start() function and its private helpers if any.\r
\r
  Copyright (C) 2013, Red Hat, Inc.\r
  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Library/UefiBootServicesTableLib.h>\r
\r
#include "VirtioNet.h"\r
\r
/**\r
  Changes the state of a network interface from "stopped" to "started".\r
\r
  @param  This Protocol instance pointer.\r
\r
  @retval EFI_SUCCESS           The network interface was started.\r
  @retval EFI_ALREADY_STARTED   The network interface is already in the started\r
                                state.\r
  @retval EFI_INVALID_PARAMETER One or more of the parameters has an\r
                                unsupported value.\r
  @retval EFI_DEVICE_ERROR      The command could not be sent to the network\r
                                interface.\r
  @retval EFI_UNSUPPORTED       This function is not supported by the network\r
                                interface.\r
**/\r
\r
EFI_STATUS\r
EFIAPI\r
VirtioNetStart (\r
  IN EFI_SIMPLE_NETWORK_PROTOCOL *This\r
  )\r
{\r
  VNET_DEV   *Dev;\r
  EFI_TPL    OldTpl;\r
  EFI_STATUS Status;\r
\r
  if (This == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  Dev = VIRTIO_NET_FROM_SNP (This);\r
  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);\r
  if (Dev->Snm.State != EfiSimpleNetworkStopped) {\r
    Status = EFI_ALREADY_STARTED;\r
  }\r
  else {\r
    Dev->Snm.State = EfiSimpleNetworkStarted;\r
    Status = EFI_SUCCESS;\r
  }\r
\r
  gBS->RestoreTPL (OldTpl);\r
  return Status;\r
}\r