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
VirtioNetStart(IN EFI_SIMPLE_NETWORK_PROTOCOL * This)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 }
65