Add Quality of Service (QoS) support

Source/Core/Common/CMakeLists.txt

@@ -29,6 +29,7 @@ set(SRCS
   PcapFile.cpp
   PerformanceCounter.cpp
   Profiler.cpp
+  QoSSession.cpp
   SDCardUtil.cpp
   SettingsHandler.cpp
   StringUtil.cpp

Source/Core/Common/Common.vcxproj

@@ -137,6 +137,7 @@
     <ClInclude Include="Network.h" />
     <ClInclude Include="PcapFile.h" />
     <ClInclude Include="Profiler.h" />
+    <ClInclude Include="QoSSession.h" />
     <ClInclude Include="ScopeGuard.h" />
     <ClInclude Include="SDCardUtil.h" />
     <ClInclude Include="Semaphore.h" />
@@ -196,6 +197,7 @@
     <ClCompile Include="Network.cpp" />
     <ClCompile Include="PcapFile.cpp" />
     <ClCompile Include="Profiler.cpp" />
+    <ClCompile Include="QoSSession.cpp" />
     <ClCompile Include="SDCardUtil.cpp" />
     <ClCompile Include="SettingsHandler.cpp" />
     <ClCompile Include="StringUtil.cpp" />

Source/Core/Common/Common.vcxproj.filters

@@ -58,6 +58,7 @@
     <ClInclude Include="Network.h" />
     <ClInclude Include="PcapFile.h" />
     <ClInclude Include="Profiler.h" />
+    <ClInclude Include="QoSSession.h" />
     <ClInclude Include="ScopeGuard.h" />
     <ClInclude Include="SDCardUtil.h" />
     <ClInclude Include="SettingsHandler.h" />
@@ -282,6 +283,7 @@
     <ClCompile Include="Network.cpp" />
     <ClCompile Include="PcapFile.cpp" />
     <ClCompile Include="Profiler.cpp" />
+    <ClCompile Include="QoSSession.h" />
     <ClCompile Include="SDCardUtil.cpp" />
     <ClCompile Include="SettingsHandler.cpp" />
     <ClCompile Include="StringUtil.cpp" />

Source/Core/Common/QoSSession.cpp

@@ -0,0 +1,87 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "Common/QoSSession.h"
+#include "Core/ConfigManager.h"
+
+#if defined(_WIN32)
+#include <Qos2.h>
+#pragma comment(lib, "qwave")
+#endif
+
+namespace Common
+{
+#if defined(_WIN32)
+QoSSession::QoSSession(ENetPeer* peer, int tos_val) : m_peer(peer)
+{
+  QOS_VERSION ver = {1, 0};
+
+  if (!QOSCreateHandle(&ver, &m_qos_handle))
+    return;
+
+  sockaddr_in sin = {};
+
+  sin.sin_family = AF_INET;
+  sin.sin_port = ENET_HOST_TO_NET_16(peer->host->address.port);
+  sin.sin_addr.s_addr = peer->host->address.host;
+
+  if (QOSAddSocketToFlow(m_qos_handle, peer->host->socket, reinterpret_cast<PSOCKADDR>(&sin),
+                         QOSTrafficTypeControl, QOS_NON_ADAPTIVE_FLOW, &m_qos_flow_id))
+  {
+    // We shift the complete ToS value by 3 to get rid of the 3 bit ECN field
+    DWORD dscp = static_cast<DWORD>(tos_val >> 3);
+
+    // Sets DSCP to the same as Linux
+    // This will fail if we're not admin, but we ignore it
+    QOSSetFlow(m_qos_handle, m_qos_flow_id, QOSSetOutgoingDSCPValue, sizeof(DWORD), &dscp, 0,
+               nullptr);
+
+    m_success = true;
+  }
+}
+
+QoSSession::~QoSSession()
+{
+  if (m_qos_handle == nullptr)
+    return;
+
+  if (m_qos_flow_id != 0)
+    QOSRemoveSocketFromFlow(m_qos_handle, m_peer->host->socket, m_qos_flow_id, 0);
+
+  QOSCloseHandle(m_qos_handle);
+}
+#else
+QoSSession::QoSSession(ENetPeer* peer, int tos_val)
+{
+#if defined(__linux__)
+  constexpr int priority = 7;
+  setsockopt(peer->host->socket, SOL_SOCKET, SO_PRIORITY, &priority, sizeof(priority));
+#endif
+
+  m_success = setsockopt(peer->host->socket, IPPROTO_IP, IP_TOS, &tos_val, sizeof(tos_val)) == 0;
+}
+
+QoSSession::~QoSSession() = default;
+#endif
+
+QoSSession& QoSSession::operator=(QoSSession&& session)
+{
+  if (this != &session)
+  {
+#if defined(_WIN32)
+    m_qos_handle = session.m_qos_handle;
+    m_qos_flow_id = session.m_qos_flow_id;
+    m_peer = session.m_peer;
+
+    session.m_qos_handle = nullptr;
+    session.m_qos_flow_id = 0;
+    session.m_peer = nullptr;
+#endif
+    m_success = session.m_success;
+    session.m_success = false;
+  }
+
+  return *this;
+}
+}  // namespace Common

Source/Core/Common/QoSSession.h

@@ -0,0 +1,40 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <enet/enet.h>
+#include <utility>
+
+namespace Common
+{
+class QoSSession
+{
+public:
+  // 1 0 1 1 1 0 0 0
+  // DSCP      ECN
+  static constexpr int ef_tos = 0b10111000;
+
+  QoSSession() = default;
+  QoSSession(ENetPeer* peer, int tos_val = ef_tos);
+
+  ~QoSSession();
+
+  QoSSession& operator=(const QoSSession&) = delete;
+  QoSSession(const QoSSession&) = delete;
+
+  QoSSession& operator=(QoSSession&& session);
+  QoSSession(QoSSession&& session) { *this = std::move(session); }
+  bool Successful() const { return m_success; }
+private:
+#if defined(_WIN32)
+  void* m_qos_handle = nullptr;
+  unsigned long m_qos_flow_id = 0;
+
+  ENetPeer* m_peer = nullptr;
+#endif
+
+  bool m_success = false;
+};
+}  // namespace Common

Source/Core/Core/Config/NetplaySettings.cpp

@@ -33,4 +33,6 @@ const ConfigInfo<std::string> NETPLAY_SELECTED_HOST_GAME{
     {System::Main, "NetPlay", "SelectedHostGame"}, ""};
 const ConfigInfo<bool> NETPLAY_USE_UPNP{{System::Main, "NetPlay", "UseUPNP"}, false};
 
+const ConfigInfo<bool> NETPLAY_ENABLE_QOS{{System::Main, "NetPlay", "EnableQoS"}, true};
+
 }  // namespace Config

Source/Core/Core/Config/NetplaySettings.h

@@ -29,4 +29,6 @@ extern const ConfigInfo<std::string> NETPLAY_NICKNAME;
 extern const ConfigInfo<std::string> NETPLAY_SELECTED_HOST_GAME;
 extern const ConfigInfo<bool> NETPLAY_USE_UPNP;
 
+extern const ConfigInfo<bool> NETPLAY_ENABLE_QOS;
+
 }  // namespace Config

Source/Core/Core/NetPlayClient.cpp

@@ -20,9 +20,11 @@
 #include "Common/ENetUtil.h"
 #include "Common/MD5.h"
 #include "Common/MsgHandler.h"
+#include "Common/QoSSession.h"
 #include "Common/StringUtil.h"
 #include "Common/Timer.h"
 #include "Common/Version.h"
+#include "Core/Config/NetplaySettings.h"
 #include "Core/ConfigManager.h"
 #include "Core/HW/EXI/EXI_DeviceIPL.h"
 #include "Core/HW/SI/SI.h"
@@ -632,6 +634,17 @@ void NetPlayClient::SendAsync(sf::Packet&& packet)
 // called from ---NETPLAY--- thread
 void NetPlayClient::ThreadFunc()
 {
+  Common::QoSSession qos_session;
+  if (Config::Get(Config::NETPLAY_ENABLE_QOS))
+  {
+    qos_session = Common::QoSSession(m_server);
+
+    if (qos_session.Successful())
+      m_dialog->AppendChat("Quality of Service (QoS) was successfully enabled.");
+    else
+      m_dialog->AppendChat("Quality of Service (QoS) couldn't be enabled.");
+  }
+
   while (m_do_loop.IsSet())
   {
     ENetEvent netEvent;

Source/Core/Core/NetPlayServer.cpp

@@ -21,10 +21,12 @@
 #include "Common/StringUtil.h"
 #include "Common/UPnP.h"
 #include "Common/Version.h"
+#include "Core/Config/NetplaySettings.h"
 #include "Core/ConfigManager.h"
 #include "Core/HW/Sram.h"
 #include "Core/NetPlayClient.h"  //for NetPlayUI
 #include "InputCommon/GCPadStatus.h"
+
 #if !defined(_WIN32)
 #include <sys/socket.h>
 #include <sys/types.h>
@@ -273,6 +275,7 @@ unsigned int NetPlayServer::OnConnect(ENetPeer* socket)
   Client player;
   player.pid = pid;
   player.socket = socket;
+
   rpac >> player.revision;
   rpac >> player.name;
 
@@ -343,10 +346,13 @@ unsigned int NetPlayServer::OnConnect(ENetPeer* socket)
     Send(player.socket, spac);
   }
 
+  if (Config::Get(Config::NETPLAY_ENABLE_QOS))
+    player.qos_session = Common::QoSSession(player.socket);
+
   // add client to the player list
   {
     std::lock_guard<std::recursive_mutex> lkp(m_crit.players);
-    m_players.emplace(*(PlayerId*)player.socket->data, player);
+    m_players.emplace(*(PlayerId*)player.socket->data, std::move(player));
     UpdatePadMapping();  // sync pad mappings with everyone
     UpdateWiimoteMapping();
   }

Source/Core/Core/NetPlayServer.h

@@ -6,12 +6,14 @@
 
 #include <SFML/Network/Packet.hpp>
 #include <map>
+#include <memory>
 #include <mutex>
 #include <queue>
 #include <sstream>
 #include <thread>
 #include <unordered_map>
 #include <unordered_set>
+#include "Common/QoSSession.h"
 #include "Common/SPSCQueue.h"
 #include "Common/Timer.h"
 #include "Common/TraversalClient.h"
@@ -71,6 +73,8 @@ private:
     u32 ping;
     u32 current_game;
 
+    Common::QoSSession qos_session;
+
     bool operator==(const Client& other) const { return this == &other; }
   };