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
28 using std::string;
29
30 namespace shill {
31
32 namespace Logging {
33 static auto kModuleLogScope = ScopeLogger::kEthernet;
ObjectID(VirtioEthernet * v)34 static string ObjectID(VirtioEthernet* v) { return v->GetRpcIdentifier(); }
35 }
36
VirtioEthernet(ControlInterface * control_interface,EventDispatcher * dispatcher,Metrics * metrics,Manager * manager,const string & link_name,const string & address,int interface_index)37 VirtioEthernet::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
~VirtioEthernet()54 VirtioEthernet::~VirtioEthernet() {
55 // Nothing to be done beyond what Ethernet dtor does.
56 }
57
Start(Error * error,const EnabledStateChangedCallback & callback)58 void 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