wiiu: Network optimisations - WINSCALE, TCP sACK, large buffers

See code sample in https://github.com/devkitPro/wut/issues/169 and 
2430789406/src/net.c (L88)

libretro-common/include/net/net_compat.h

@@ -158,6 +158,11 @@ static INLINE bool isagain(int bytes)
 #endif
 }
 
+#ifdef WIIU
+#define WIIU_RCVBUF (128 * 2 * 1024)
+#define WIIU_SNDBUF (128 * 2 * 1024)
+#endif
+
 #ifdef _XBOX
 #define socklen_t int
 

libretro-common/net/net_compat.c

@@ -264,6 +264,25 @@ void freeaddrinfo_retro(struct addrinfo *res)
 #endif
 }
 
+#if defined(WIIU)
+#include <malloc.h>
+
+static OSThread wiiu_net_cmpt_thread;
+static void wiiu_net_cmpt_thread_cleanup(OSThread *thread, void *stack) {
+   free(stack);
+}
+static int wiiu_net_cmpt_thread_entry(int argc, const char** argv) {
+   const int buf_size = WIIU_RCVBUF + WIIU_SNDBUF;
+   void* buf = memalign(128, buf_size);
+   if (!buf) return -1;
+
+   somemopt(1, buf, buf_size, 0);
+
+   free(buf);
+   return 0;
+}
+#endif
+
 /**
  * network_init:
  *
@@ -332,6 +351,18 @@ bool network_init(void)
       return false;
 #elif defined(WIIU)
    socket_lib_init();
+
+   const int stack_size = 4096;
+   void* stack = malloc(stack_size);
+   if (stack && OSCreateThread(&wiiu_net_cmpt_thread,
+      wiiu_net_cmpt_thread_entry, 0, NULL, stack+stack_size, stack_size,
+      3, OS_THREAD_ATTRIB_AFFINITY_ANY)) {
+
+      OSSetThreadName(&wiiu_net_cmpt_thread, "Network compat thread");
+      OSSetThreadDeallocator(&wiiu_net_cmpt_thread,
+         wiiu_net_cmpt_thread_cleanup);
+      OSResumeThread(&wiiu_net_cmpt_thread);
+   }
 #elif defined(_3DS)
     _net_compat_net_memory = (u32*)memalign(SOC_ALIGN, SOC_BUFFERSIZE);
 	if (!_net_compat_net_memory)

libretro-common/net/net_socket.c

@@ -256,6 +256,20 @@ int socket_connect(int fd, void *data, bool timeout_enable)
 
       setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeout, sizeof timeout);
    }
+#endif
+#if defined(WIIU)
+   int op = 1;
+   setsockopt(fd, SOL_SOCKET, SO_WINSCALE, &op, sizeof(op));
+   if (addr->ai_socktype == SOCK_STREAM) {
+      setsockopt(fd, SOL_SOCKET, SO_TCPSACK, &op, sizeof(op));
+
+      setsockopt(fd, SOL_SOCKET, 0x10000, &op, sizeof(op));
+      int recvsz = WIIU_RCVBUF;
+      setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &recvsz, sizeof(recvsz));
+      int sendsz = WIIU_SNDBUF;
+      setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &sendsz, sizeof(sendsz));
+   }
+
 #endif
 
    return connect(fd, addr->ai_addr, addr->ai_addrlen);

wiiu/include/sys/socket.h

@@ -21,6 +21,10 @@ extern "C" {
 /* #define MSG_DONTWAIT    0x0004 */
 
 #define SO_REUSEADDR    0x0004
+#define SO_WINSCALE     0x0400
+#define SO_TCPSACK      0x0200
+#define SO_SNDBUF       0x1001
+#define SO_RCVBUF       0x1002
 #define SO_NBIO         0x1014
 #define SO_NONBLOCK     0x1016
 
@@ -70,6 +74,7 @@ int setsockopt(int sockfd, int level, int optname, const void *optval, socklen_t
 int shutdown(int sockfd, int how);
 int socket(int domain, int type, int protocol);
 int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);
+int somemopt (int req_type, char* mem, unsigned int memlen, int flags);
 
 int socketlasterr(void);
 

wiiu/include/wiiu/os/thread.h

@@ -133,7 +133,7 @@ typedef struct
 
 #define OS_THREAD_TAG 0x74487244u
 #pragma pack(push, 1)
-typedef struct OSThread
+typedef struct __attribute__ ((aligned (8))) OSThread
 {
    OSContext context;
 

wiiu/system/imports.h

@@ -32,6 +32,7 @@ IMPORT(OSIsThreadTerminated);
 IMPORT(OSSetThreadPriority);
 IMPORT(OSCreateThread);
 IMPORT(OSSetThreadCleanupCallback);
+IMPORT(OSSetThreadDeallocator);
 IMPORT(OSResumeThread);
 IMPORT(OSIsThreadSuspended);
 IMPORT(OSSuspendThread);
@@ -39,6 +40,7 @@ IMPORT(OSGetCurrentThread);
 IMPORT(OSExitThread);
 IMPORT(OSJoinThread);
 IMPORT(OSYieldThread);
+IMPORT(OSSetThreadName);
 IMPORT(OSGetCoreId);
 IMPORT(OSIsMainCore);
 IMPORT(OSGetSystemTime);
@@ -153,6 +155,12 @@ IMPORT(socketlasterr);
 
 IMPORT_END();
 
+IMPORT_BEGIN(nn_nets2);
+
+IMPORT(somemopt);
+
+IMPORT_END();
+
 /* gx2 */
 IMPORT_BEGIN(gx2);