1//
2// Copyright (C) 2012 The Android Open Source Project
3//
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at
7//
8//      http://www.apache.org/licenses/LICENSE-2.0
9//
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15//
16
17#include "shill/ethernet/virtio_ethernet.h"
18
19#include <unistd.h>
20
21#include <string>
22
23#include "shill/control_interface.h"
24#include "shill/event_dispatcher.h"
25#include "shill/logging.h"
26#include "shill/manager.h"
27
28using std::string;
29
30namespace shill {
31
32namespace Logging {
33static auto kModuleLogScope = ScopeLogger::kEthernet;
34static string ObjectID(VirtioEthernet* v) { return v->GetRpcIdentifier(); }
35}
36
37VirtioEthernet::VirtioEthernet(ControlInterface* control_interface,
38                               EventDispatcher* dispatcher,
39                               Metrics* metrics,
40                               Manager* manager,
41                               const string& link_name,
42                               const string& address,
43                               int interface_index)
44    : Ethernet(control_interface,
45               dispatcher,
46               metrics,
47               manager,
48               link_name,
49               address,
50               interface_index) {
51  SLOG(this, 2) << "VirtioEthernet device " << link_name << " initialized.";
52}
53
54VirtioEthernet::~VirtioEthernet() {
55  // Nothing to be done beyond what Ethernet dtor does.
56}
57
58void VirtioEthernet::Start(Error* error,
59                           const EnabledStateChangedCallback& callback) {
60  // We are sometimes instantiated (by DeviceInfo) before the Linux kernel
61  // has completed the setup function for the device (virtio_net:virtnet_probe).
62  //
63  // Furthermore, setting the IFF_UP flag on the device (as done in
64  // Ethernet::Start) may cause the kernel IPv6 code to send packets even
65  // though virtnet_probe has not completed.
66  //
67  // When that happens, the device gets stuck in a state where it cannot
68  // transmit any frames. (See crbug.com/212041)
69  //
70  // To avoid this, we sleep to let the device setup function complete.
71  SLOG(this, 2) << "Sleeping to let virtio initialize.";
72  sleep(2);
73  SLOG(this, 2) << "Starting virtio Ethernet.";
74  Ethernet::Start(error, callback);
75}
76
77}  // namespace shill
78