src/Windows/ether_windows.cpp

/*
 *  ether_windows.cpp - Ethernet device driver
 *
 *  Basilisk II (C) 1997-2005 Christian Bauer
 *
 *  Windows platform specific code copyright (C) Lauri Pesonen
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <process.h>
#include <windowsx.h>
#include <ctype.h>

#include "sysdeps.h"
#include "cpu_emulation.h"
#include "main.h"
#include "macos_util.h"
#include "prefs.h"
#include "user_strings.h"
#include "ether.h"
#include "ether_defs.h"
#include "b2ether/multiopt.h"
#include "b2ether/inc/b2ether_hl.h"
#include "ether_windows.h"
#include "router/router.h"
#include "kernel_windows.h"


#define DEBUG 0
#define MONITOR 0

#if DEBUG
#pragma optimize("",off)
#endif

#include "debug.h"


// Ethernet device types
enum {
        NET_IF_B2ETHER,
        NET_IF_ROUTER,
        NET_IF_FAKE,
};

// Options
bool ether_use_permanent = true;
static int16 ether_multi_mode = ETHER_MULTICAST_MAC;

// Global variables
HANDLE ether_th;
unsigned int ether_tid;
HANDLE ether_th1;
HANDLE ether_th2;
static int net_if_type = -1;                            // Ethernet device type
#ifdef SHEEPSHAVER
static bool net_open = false;                           // Flag: initialization succeeded, network device open
uint8 ether_addr[6];                                            // Our Ethernet address
#endif

// These are protected by queue_csection
// Controls transfer for read thread to feed thread
static CRITICAL_SECTION queue_csection;
typedef struct _win_queue_t {
        uint8 *buf;
        int sz;
} win_queue_t;
#define MAX_QUEUE_ITEMS 1024
static win_queue_t queue[MAX_QUEUE_ITEMS];
static int queue_head = 0;
static int queue_inx = 0;
static bool wait_request = true;


// Read thread protected packet pool
static CRITICAL_SECTION fetch_csection;
// Some people use pools as large as 64.
#define PACKET_POOL_COUNT 10
static LPPACKET packets[PACKET_POOL_COUNT];
static bool wait_request2 = false;


// Write thread packet queue
static CRITICAL_SECTION send_csection;
static LPPACKET send_queue = 0;


// Write thread free packet pool
static CRITICAL_SECTION wpool_csection;
static LPPACKET write_packet_pool = 0;


// Try to deal with echos. Protected by fetch_csection.
// The code should be moved to the driver. No need to lift
// the echo packets to the application level.
// MAX_ECHO must be a power of two.
#define MAX_ECHO (1<<2)
static int echo_count = 0;
typedef uint8 echo_t[1514];
static echo_t pending_packet[MAX_ECHO];
static int pending_packet_sz[MAX_ECHO];


// List of attached protocols
struct NetProtocol {
        NetProtocol *next;
        uint16 type;
        uint32 handler;
};

static NetProtocol *prot_list = NULL;


static LPADAPTER fd = 0;
static bool thread_active = false;
static bool thread_active_1 = false;
static bool thread_active_2 = false;
static bool thread_active_3 = false;
static HANDLE int_ack = 0;
static HANDLE int_sig = 0;
static HANDLE int_sig2 = 0;
static HANDLE int_send_now = 0;

// Prototypes
static WINAPI unsigned int ether_thread_feed_int(void *arg);
static WINAPI unsigned int ether_thread_get_packets_nt(void *arg);
static WINAPI unsigned int ether_thread_write_packets(void *arg);
static void init_queue(void);
static void final_queue(void);
static bool allocate_read_packets(void);
static void free_read_packets(void);
static void free_write_packets(void);
static int16 ether_do_add_multicast(uint8 *addr);
static int16 ether_do_del_multicast(uint8 *addr);
static int16 ether_do_write(uint32 arg);
static void ether_do_interrupt(void);


/*
 *  Find protocol in list
 */

static NetProtocol *find_protocol(uint16 type)
{
        // All 802.2 types are the same
        if (type <= 1500)
                type = 0;

        // Search list (we could use hashing here but there are usually only three
        // handlers installed: 0x0000 for AppleTalk and 0x0800/0x0806 for TCP/IP)
        NetProtocol *p = prot_list;
        while (p) {
                if (p->type == type)
                        return p;
                p = p->next;
        }
        return NULL;
}


/*
 *  Initialization
 */

bool ether_init(void)
{
        char str[256];

        // Do nothing if no Ethernet device specified
        const char *name = PrefsFindString("ether");
        if (name == NULL)
                return false;

        ether_multi_mode = PrefsFindInt32("ethermulticastmode");
        ether_use_permanent = PrefsFindBool("etherpermanentaddress");

        // Determine Ethernet device type
        net_if_type = -1;
        if (strcmp(name, "router") == 0)
                net_if_type = NET_IF_ROUTER;
        else
                net_if_type = NET_IF_B2ETHER;

        // Initialize NAT-Router
        if (net_if_type == NET_IF_ROUTER) {
                if (!router_init())
                        net_if_type = NET_IF_FAKE;
        }

        // Open ethernet device
        const char *dev_name;
        switch (net_if_type) {
        case NET_IF_B2ETHER:
                dev_name = PrefsFindString("etherguid");
                break;
        }
        if (net_if_type == NET_IF_B2ETHER) {
                if (dev_name == NULL) {
                        WarningAlert("No ethernet device GUID specified. Ethernet is not available.");
                        goto open_error;
                }

                fd = PacketOpenAdapter( dev_name, ether_multi_mode );
                if (!fd) {
                        sprintf(str, "Could not open ethernet adapter %s.", dev_name);
                        WarningAlert(str);
                        goto open_error;
                }

                // Get Ethernet address
                if(!PacketGetMAC(fd,ether_addr,ether_use_permanent)) {
                        sprintf(str, "Could not get hardware address of device %s. Ethernet is not available.", dev_name);
                        WarningAlert(str);
                        goto open_error;
                }
                D(bug("Real ethernet address %02x %02x %02x %02x %02x %02x\n", ether_addr[0], ether_addr[1], ether_addr[2], ether_addr[3], ether_addr[4], ether_addr[5]));

                const char *ether_fake_address;
                ether_fake_address = PrefsFindString("etherfakeaddress");
                if(ether_fake_address && strlen(ether_fake_address) == 12) {
                        char sm[10];
                        strcpy( sm, "0x00" );
                        for( int i=0; i<6; i++ ) {
                                sm[2] = ether_fake_address[i*2];
                                sm[3] = ether_fake_address[i*2+1];
                                ether_addr[i] = (uint8)strtoul(sm,0,0);
                        }
                        D(bug("Fake ethernet address %02x %02x %02x %02x %02x %02x\n", ether_addr[0], ether_addr[1], ether_addr[2], ether_addr[3], ether_addr[4], ether_addr[5]));
                }
        }
        else {
                memcpy( ether_addr, router_mac_addr, 6 );
                D(bug("Fake ethernet address (same as router) %02x %02x %02x %02x %02x %02x\n", ether_addr[0], ether_addr[1], ether_addr[2], ether_addr[3], ether_addr[4], ether_addr[5]));
        }

        // Start packet reception thread
        int_ack = CreateSemaphore( 0, 0, 1, NULL);
        if(!int_ack) {
                WarningAlert("WARNING: Cannot create int_ack semaphore");
                goto open_error;
        }

        // nonsignaled
        int_sig = CreateSemaphore( 0, 0, 1, NULL);
        if(!int_sig) {
                WarningAlert("WARNING: Cannot create int_sig semaphore");
                goto open_error;
        }

        int_sig2 = CreateSemaphore( 0, 0, 1, NULL);
        if(!int_sig2) {
                WarningAlert("WARNING: Cannot create int_sig2 semaphore");
                goto open_error;
        }

        int_send_now = CreateSemaphore( 0, 0, 1, NULL);
        if(!int_send_now) {
                WarningAlert("WARNING: Cannot create int_send_now semaphore");
                goto open_error;
        }

        init_queue();

        if(!allocate_read_packets()) goto open_error;

        // No need to enter wait state if we can avoid it.
        // These all terminate fast.

        if(pfnInitializeCriticalSectionAndSpinCount) {
                pfnInitializeCriticalSectionAndSpinCount( &fetch_csection, 5000 );
        } else {
                InitializeCriticalSection( &fetch_csection );
        }
        if(pfnInitializeCriticalSectionAndSpinCount) {
                pfnInitializeCriticalSectionAndSpinCount( &queue_csection, 5000 );
        } else {
                InitializeCriticalSection( &queue_csection );
        }
        if(pfnInitializeCriticalSectionAndSpinCount) {
                pfnInitializeCriticalSectionAndSpinCount( &send_csection, 5000 );
        } else {
                InitializeCriticalSection( &send_csection );
        }
        if(pfnInitializeCriticalSectionAndSpinCount) {
                pfnInitializeCriticalSectionAndSpinCount( &wpool_csection, 5000 );
        } else {
                InitializeCriticalSection( &wpool_csection );
        }

        ether_th = (HANDLE)_beginthreadex( 0, 0, ether_thread_feed_int, 0, 0, &ether_tid );
        if (!ether_th) {
                D(bug("Failed to create ethernet thread\n"));
                goto open_error;
        }
        thread_active = true;

        unsigned int dummy;
        ether_th2 = (HANDLE)_beginthreadex( 0, 0, ether_thread_get_packets_nt, 0, 0, &dummy );
        ether_th1 = (HANDLE)_beginthreadex( 0, 0, ether_thread_write_packets, 0, 0, &dummy );

        // Everything OK
        return true;

 open_error:
        if (thread_active) {
                TerminateThread(ether_th,0);
                ether_th = 0;
                if (int_ack)
                        CloseHandle(int_ack);
                int_ack = 0;
                if(int_sig)
                        CloseHandle(int_sig);
                int_sig = 0;
                if(int_sig2)
                        CloseHandle(int_sig2);
                int_sig2 = 0;
                if(int_send_now)
                        CloseHandle(int_send_now);
                int_send_now = 0;
                thread_active = false;
        }
        if(net_if_type == NET_IF_B2ETHER) {
                PacketCloseAdapter(fd);
        }
        fd = 0;
        return false;
}


/*
 *  Deinitialization
 */

void ether_exit(void)
{
        D(bug("EtherExit\n"));

        // Stop reception thread
        thread_active = false;

        if(int_ack) ReleaseSemaphore(int_ack,1,NULL);
        if(int_sig) ReleaseSemaphore(int_sig,1,NULL);
        if(int_sig2) ReleaseSemaphore(int_sig2,1,NULL);
        if(int_send_now) ReleaseSemaphore(int_send_now,1,NULL);

        D(bug("CancelIO if needed\n"));
        if (fd && fd->hFile && pfnCancelIo)
                pfnCancelIo(fd->hFile);

        // Wait max 2 secs to shut down pending io. After that, kill them.
        D(bug("Wait delay\n"));
        for( int i=0; i<10; i++ ) {
                if(!thread_active_1 && !thread_active_2 && !thread_active_3) break;
                Sleep(200);
        }

        if(thread_active_1) {
                D(bug("Ether killing ether_th1\n"));
                if(ether_th1) TerminateThread(ether_th1,0);
                thread_active_1 = false;
        }
        if(thread_active_2) {
                D(bug("Ether killing ether_th2\n"));
                if(ether_th2) TerminateThread(ether_th2,0);
                thread_active_2 = false;
        }
        if(thread_active_3) {
                D(bug("Ether killing thread\n"));
                if(ether_th) TerminateThread(ether_th,0);
                thread_active_3 = false;
        }

        ether_th1 = 0;
        ether_th2 = 0;
        ether_th = 0;

        D(bug("Closing semaphores\n"));
        if(int_ack) {
                CloseHandle(int_ack);
                int_ack = 0;
        }
        if(int_sig) {
                CloseHandle(int_sig);
                int_sig = 0;
        }
        if(int_sig2) {
                CloseHandle(int_sig2);
                int_sig2 = 0;
        }
        if(int_send_now) {
                CloseHandle(int_send_now);
                int_send_now = 0;
        }

        // Close ethernet device
        if(fd) {
                PacketCloseAdapter(fd);
                fd = 0;
        }

        // Remove all protocols
        D(bug("Removing protocols\n"));
        NetProtocol *p = prot_list;
        while (p) {
                NetProtocol *next = p->next;
                delete p;
                p = next;
        }
        prot_list = 0;

        D(bug("Deleting sections\n"));
        DeleteCriticalSection( &fetch_csection );
        DeleteCriticalSection( &queue_csection );
        DeleteCriticalSection( &send_csection );
        DeleteCriticalSection( &wpool_csection );

        D(bug("Freeing read packets\n"));
        free_read_packets();

        D(bug("Freeing write packets\n"));
        free_write_packets();

        D(bug("Finalizing queue\n"));
        final_queue();

        if (net_if_type == NET_IF_ROUTER) {
                D(bug("Stopping router\n"));
                router_final();
        }

        D(bug("EtherExit done\n"));
}


/*
 *  Glue around low-level implementation
 */

#ifdef SHEEPSHAVER
// Error codes
enum {
        eMultiErr               = -91,
        eLenErr                 = -92,
        lapProtErr              = -94,
        excessCollsns   = -95
};

// Initialize ethernet
void EtherInit(void)
{
        net_open = false;

        // Do nothing if the user disabled the network
        if (PrefsFindBool("nonet"))
                return;

        net_open = ether_init();
}

// Exit ethernet
void EtherExit(void)
{
        ether_exit();
        net_open = false;
}

// Get ethernet hardware address
void AO_get_ethernet_address(uint32 arg)
{
        uint8 *addr = Mac2HostAddr(arg);
        if (net_open)
                OTCopy48BitAddress(ether_addr, addr);
        else {
                addr[0] = 0x12;
                addr[1] = 0x34;
                addr[2] = 0x56;
                addr[3] = 0x78;
                addr[4] = 0x9a;
                addr[5] = 0xbc;
        }
        D(bug("AO_get_ethernet_address: got address %02x%02x%02x%02x%02x%02x\n", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]));
}

// Add multicast address
void AO_enable_multicast(uint32 addr)
{
        if (net_open)
                ether_do_add_multicast(Mac2HostAddr(addr));
}

// Disable multicast address
void AO_disable_multicast(uint32 addr)
{
        if (net_open)
                ether_do_del_multicast(Mac2HostAddr(addr));
}

// Transmit one packet
void AO_transmit_packet(uint32 mp)
{
        if (net_open) {
                switch (ether_do_write(mp)) {
                case noErr:
                        num_tx_packets++;
                        break;
                case excessCollsns:
                        num_tx_buffer_full++;
                        break;
                }
        }
}

// Copy packet data from message block to linear buffer
static inline int ether_arg_to_buffer(uint32 mp, uint8 *p)
{
        return ether_msgb_to_buffer(mp, p);
}

// Ethernet interrupt
void EtherIRQ(void)
{
        D(bug("EtherIRQ\n"));
        num_ether_irq++;

        OTEnterInterrupt();
        ether_do_interrupt();
        OTLeaveInterrupt();

        // Acknowledge interrupt to reception thread
        D(bug(" EtherIRQ done\n"));
        ReleaseSemaphore(int_ack,1,NULL);
}
#else
// Add multicast address
int16 ether_add_multicast(uint32 pb)
{
        return ether_do_add_multicast(Mac2HostAddr(pb + eMultiAddr));
}

// Disable multicast address
int16 ether_del_multicast(uint32 pb)
{
        return ether_do_del_multicast(Mac2HostAddr(pb + eMultiAddr));
}

// Transmit one packet
int16 ether_write(uint32 wds)
{
        return ether_do_write(wds);
}

// Copy packet data from WDS to linear buffer
static inline int ether_arg_to_buffer(uint32 wds, uint8 *p)
{
        return ether_wds_to_buffer(wds, p);
}

// Dispatch packet to protocol handler
static void ether_dispatch_packet(uint32 packet, uint32 length)
{
        // Get packet type
        uint16 type = ReadMacInt16(packet + 12);

        // Look for protocol
        NetProtocol *prot = find_protocol(type);
        if (prot == NULL)
                return;

        // No default handler
        if (prot->handler == 0)
                return;

        // Copy header to RHA
        Mac2Mac_memcpy(ether_data + ed_RHA, packet, 14);
        D(bug(" header %08lx%04lx %08lx%04lx %04lx\n", ReadMacInt32(ether_data + ed_RHA), ReadMacInt16(ether_data + ed_RHA + 4), ReadMacInt32(ether_data + ed_RHA + 6), ReadMacInt16(ether_data + ed_RHA + 10), ReadMacInt16(ether_data + ed_RHA + 12)));

        // Call protocol handler
        M68kRegisters r;
        r.d[0] = type;                                                          // Packet type
        r.d[1] = length - 14;                                           // Remaining packet length (without header, for ReadPacket)
        r.a[0] = packet + 14;                                           // Pointer to packet (Mac address, for ReadPacket)
        r.a[3] = ether_data + ed_RHA + 14;                      // Pointer behind header in RHA
        r.a[4] = ether_data + ed_ReadPacket;            // Pointer to ReadPacket/ReadRest routines
        D(bug(" calling protocol handler %08lx, type %08lx, length %08lx, data %08lx, rha %08lx, read_packet %08lx\n", prot->handler, r.d[0], r.d[1], r.a[0], r.a[3], r.a[4]));
        Execute68k(prot->handler, &r);
}

// Ethernet interrupt
void EtherInterrupt(void)
{
        D(bug("EtherIRQ\n"));
        ether_do_interrupt();

        // Acknowledge interrupt to reception thread
        D(bug(" EtherIRQ done\n"));
        ReleaseSemaphore(int_ack,1,NULL);
}
#endif


/*
 *  Reset
 */

void ether_reset(void)
{
        D(bug("EtherReset\n"));

        // Remove all protocols
        NetProtocol *p = prot_list;
        while (p) {
                NetProtocol *next = p->next;
                delete p;
                p = next;
        }
        prot_list = NULL;
}


/*
 *  Add multicast address
 */

static int16 ether_do_add_multicast(uint8 *addr)
{
        D(bug("ether_add_multicast\n"));

        // We wouldn't need to do this
        // if(ether_multi_mode != ETHER_MULTICAST_MAC) return noErr;

        switch (net_if_type) {
        case NET_IF_B2ETHER:
                if (!PacketAddMulticast( fd, addr)) {
                        D(bug("WARNING: couldn't enable multicast address\n"));
                        return eMultiErr;
                }
        default:
                D(bug("ether_add_multicast: noErr\n"));
                return noErr;
        }
}


/*
 *  Delete multicast address
 */

int16 ether_do_del_multicast(uint8 *addr)
{
        D(bug("ether_del_multicast\n"));

        // We wouldn't need to do this
        // if(ether_multi_mode != ETHER_MULTICAST_MAC) return noErr;

        switch (net_if_type) {
        case NET_IF_B2ETHER:
                if (!PacketDelMulticast( fd, addr)) {
                        D(bug("WARNING: couldn't disable multicast address\n"));
                        return eMultiErr;
                }
        default:
                return noErr;
        }
}


/*
 *  Attach protocol handler
 */

int16 ether_attach_ph(uint16 type, uint32 handler)
{
        D(bug("ether_attach_ph type=0x%x, handler=0x%x\n",(int)type,handler));

        // Already attached?
        NetProtocol *p = find_protocol(type);
        if (p != NULL) {
                D(bug("ether_attach_ph: lapProtErr\n"));
                return lapProtErr;
        } else {
                // No, create and attach
                p = new NetProtocol;
                p->next = prot_list;
                p->type = type;
                p->handler = handler;
                prot_list = p;
                D(bug("ether_attach_ph: noErr\n"));
                return noErr;
        }
}


/*
 *  Detach protocol handler
 */

int16 ether_detach_ph(uint16 type)
{
        D(bug("ether_detach_ph type=%08lx\n",(int)type));

        NetProtocol *p = find_protocol(type);
        if (p != NULL) {
                NetProtocol *previous = 0;
                NetProtocol *q = prot_list;
                while(q) {
                        if (q == p) {
                                if(previous) {
                                        previous->next = q->next;
                                } else {
                                        prot_list = q->next;
                                }
                                delete p;
                                return noErr;
                        }
                        previous = q;
                        q = q->next;
                }
        }
        return lapProtErr;
}

#if MONITOR
static void dump_packet( uint8 *packet, int length )
{
        char buf[1000], sm[10];

        *buf = 0;

        if(length > 256) length = 256;

        for (int i=0; i<length; i++) {
                sprintf(sm," %02x", (int)packet[i]);
                strcat( buf, sm );
        }
        strcat( buf, "\n" );
        bug(buf);
}
#endif


/*
 *  Transmit raw ethernet packet
 */

static void insert_send_queue( LPPACKET Packet )
{
        EnterCriticalSection( &send_csection );
        Packet->next = 0;
        if(send_queue) {
                LPPACKET p = send_queue;
                // The queue is short. It would be larger overhead to double-link it.
                while(p->next) p = p->next;
                p->next = Packet;
        } else {
                send_queue = Packet;
        }
        LeaveCriticalSection( &send_csection );
}

static LPPACKET get_send_head( void )
{
        LPPACKET Packet = 0;

        EnterCriticalSection( &send_csection );
        if(send_queue) {
                Packet = send_queue;
                send_queue = send_queue->next;
        }
        LeaveCriticalSection( &send_csection );

        return Packet;
}

static int get_write_packet_pool_sz( void )
{
        LPPACKET t = write_packet_pool;
        int sz = 0;

        while(t) {
                t = t->next;
                sz++;
        }
        return(sz);
}

static void free_write_packets( void )
{
        LPPACKET next;
        int i = 0;
        while(write_packet_pool) {
                next = write_packet_pool->next;
                D(bug("Freeing write packet %ld\n",++i));
                PacketFreePacket(write_packet_pool);
                write_packet_pool = next;
        }
}

void recycle_write_packet( LPPACKET Packet )
{
        EnterCriticalSection( &wpool_csection );
        Packet->next = write_packet_pool;
        write_packet_pool = Packet;
        D(bug("Pool size after recycling = %ld\n",get_write_packet_pool_sz()));
        LeaveCriticalSection( &wpool_csection );
}

static LPPACKET get_write_packet( UINT len )
{
        LPPACKET Packet = 0;

        EnterCriticalSection( &wpool_csection );
        if(write_packet_pool) {
                Packet = write_packet_pool;
                write_packet_pool = write_packet_pool->next;
                Packet->OverLapped.Offset = 0;
                Packet->OverLapped.OffsetHigh = 0;
                Packet->Length = len;
                Packet->BytesReceived   = 0;
                Packet->bIoComplete     = FALSE;
                Packet->free = TRUE;
                Packet->next = 0;
                // actually an auto-reset event.
                if(Packet->OverLapped.hEvent) ResetEvent(Packet->OverLapped.hEvent);
        } else {
                Packet = PacketAllocatePacket(fd,len);
        }

        D(bug("Pool size after get wr packet = %ld\n",get_write_packet_pool_sz()));

        LeaveCriticalSection( &wpool_csection );

        return Packet;
}

static unsigned int ether_thread_write_packets(void *arg)
{
        LPPACKET Packet;

        thread_active_1 = true;

        D(bug("ether_thread_write_packets start\n"));

        while(thread_active) {
                // must be alertable, otherwise write completion is never called
                WaitForSingleObjectEx(int_send_now,INFINITE,TRUE);
                while( thread_active && (Packet = get_send_head()) != 0 ) {
                        switch (net_if_type) {
                        case NET_IF_ROUTER:
                                if(router_write_packet((uint8 *)Packet->Buffer, Packet->Length)) {
                                        Packet->bIoComplete = TRUE;
                                        recycle_write_packet(Packet);
                                }
                                break;
                        case NET_IF_FAKE:
                                Packet->bIoComplete = TRUE;
                                recycle_write_packet(Packet);
                                break;
                        case NET_IF_B2ETHER:
                                if(!PacketSendPacket( fd, Packet, FALSE, TRUE )) {
                                        // already recycled if async
                                }
                                break;
                        }
                }
        }

        D(bug("ether_thread_write_packets exit\n"));

        thread_active_1 = false;

        return(0);
}

static BOOL write_packet( uint8 *packet, int len )
{
        LPPACKET Packet;

        D(bug("write_packet\n"));

        Packet = get_write_packet(len);
        if(Packet) {
                memcpy( Packet->Buffer, packet, len );

                EnterCriticalSection( &fetch_csection );
                pending_packet_sz[echo_count] = min(sizeof(pending_packet),len);
                memcpy( pending_packet[echo_count], packet, pending_packet_sz[echo_count] );
                echo_count = (echo_count+1) & (~(MAX_ECHO-1));
                LeaveCriticalSection( &fetch_csection );

                insert_send_queue( Packet );

                ReleaseSemaphore(int_send_now,1,NULL);
                return(TRUE);
        } else {
                return(FALSE);
        }
}

static int16 ether_do_write(uint32 arg)
{
        D(bug("ether_write\n"));

        // Copy packet to buffer
        uint8 packet[1514], *p = packet;
        int len = ether_arg_to_buffer(arg, p);

        if(len > 1514) {
                D(bug("illegal packet length: %d\n",len));
                return eLenErr;
        } else {
#if MONITOR
                bug("Sending Ethernet packet (%d bytes):\n",(int)len);
                dump_packet( packet, len );
#endif
        }

        // Transmit packet
        if (!write_packet(packet, len)) {
                D(bug("WARNING: couldn't transmit packet\n"));
                return excessCollsns;
        } else {
                // It's up to the protocol drivers to do the error checking. Even if the
                // i/o completion routine returns ok, there can be errors, so there is
                // no point to wait for write completion and try to make some sense of the
                // possible error codes.
                return noErr;
        }
}


static void init_queue(void)
{
        queue_inx = 0;
        queue_head = 0;

        for( int i=0; i<MAX_QUEUE_ITEMS; i++ ) {
                queue[i].buf = (uint8 *)malloc( 1514 );
                queue[i].sz = 0;
        }
}

static void final_queue(void)
{
        for( int i=0; i<MAX_QUEUE_ITEMS; i++ ) {
                if(queue[i].buf) free(queue[i].buf);
        }
}

void enqueue_packet( uint8 *buf, int sz )
{
        EnterCriticalSection( &queue_csection );
        if(queue[queue_inx].sz > 0) {
                D(bug("ethernet queue full, packet dropped\n"));
        } else {
                if(sz > 1514) sz = 1514;
                queue[queue_inx].sz = sz;
                memcpy( queue[queue_inx].buf, buf, sz );
                queue_inx++;
                if(queue_inx >= MAX_QUEUE_ITEMS) queue_inx = 0;
                if(wait_request) {
                        wait_request = false;
                        ReleaseSemaphore(int_sig,1,NULL);
                }
        }
        LeaveCriticalSection( &queue_csection );
}

static int dequeue_packet( uint8 *buf )
{
        int sz;

        if(!thread_active) return(0);

        EnterCriticalSection( &queue_csection );
        sz = queue[queue_head].sz;
        if(sz > 0) {
                memcpy( buf, queue[queue_head].buf, sz );
                queue[queue_head].sz = 0;
                queue_head++;
                if(queue_head >= MAX_QUEUE_ITEMS) queue_head = 0;
        }
        LeaveCriticalSection( &queue_csection );
        return(sz);
}

static void trigger_queue(void)
{
        EnterCriticalSection( &queue_csection );
        if( queue[queue_head].sz > 0 ) {
                D(bug(" packet received, triggering Ethernet interrupt\n"));
                SetInterruptFlag(INTFLAG_ETHER);
                TriggerInterrupt();
                // of course can't wait here.
        }
        LeaveCriticalSection( &queue_csection );
}

static bool set_wait_request(void)
{
        bool result;
        EnterCriticalSection( &queue_csection );
        if(queue[queue_head].sz) {
                result = true;
        } else {
                result = false;
                wait_request = true;
        }
        LeaveCriticalSection( &queue_csection );
        return(result);
}


/*
 *  Packet reception threads
 */

VOID CALLBACK packet_read_completion(
        DWORD dwErrorCode,
        DWORD dwNumberOfBytesTransfered,
        LPOVERLAPPED lpOverlapped
        )
{
        EnterCriticalSection( &fetch_csection );

        LPPACKET lpPacket = CONTAINING_RECORD(lpOverlapped,PACKET,OverLapped);

        D(bug("packet_read_completion bytes=%d, error code=%d\n",dwNumberOfBytesTransfered,dwErrorCode));

        if(thread_active && !dwErrorCode) {
                int count = min(dwNumberOfBytesTransfered,1514);
                if(count) {
                        int j = echo_count;
                        for(int i=MAX_ECHO; i; i--) {
                                j--;
                                if(j < 0) j = MAX_ECHO-1;
                                if(count == pending_packet_sz[j] &&
                                   memcmp(pending_packet[j],lpPacket->Buffer,count) == 0)
                                {
                                        D(bug("packet_read_completion discarding own packet.\n"));
                                        dwNumberOfBytesTransfered = 0;

                                        j = (j+1) & (~(MAX_ECHO-1));
                                        if(j != echo_count) {
                                                D(bug("Wow, this fix made some good after all...\n"));
                                        }

                                        break;
                                }
                        }
                        if(dwNumberOfBytesTransfered) {
                                if(net_if_type != NET_IF_ROUTER || !router_read_packet((uint8 *)lpPacket->Buffer, dwNumberOfBytesTransfered)) {
                                        enqueue_packet( (LPBYTE)lpPacket->Buffer, dwNumberOfBytesTransfered );
                                }
                        }
                }
        }

        // actually an auto-reset event.
        if(lpPacket->OverLapped.hEvent) ResetEvent(lpPacket->OverLapped.hEvent);

        lpPacket->free = TRUE;
        lpPacket->bIoComplete = TRUE;

        if(wait_request2) {
                wait_request2 = false;
                ReleaseSemaphore(int_sig2,1,NULL);
        }

        LeaveCriticalSection( &fetch_csection );
}

static BOOL has_no_completed_io(void)
{
        BOOL result = TRUE;

        EnterCriticalSection( &fetch_csection );

        for( int i=0; i<PACKET_POOL_COUNT; i++ ) {
                if(packets[i]->bIoComplete) {
                        result = FALSE;
                        break;
                }
        }
        if(result) wait_request2 = true;

        LeaveCriticalSection( &fetch_csection );
        return(result);
}

static bool allocate_read_packets(void)
{
        for( int i=0; i<PACKET_POOL_COUNT; i++ ) {
                packets[i] = PacketAllocatePacket(fd,1514);
                if(!packets[i]) {
                        D(bug("allocate_read_packets: out of memory\n"));
                        return(false);
                }
        }
        return(true);
}

static void free_read_packets(void)
{
        for( int i=0; i<PACKET_POOL_COUNT; i++ ) {
                PacketFreePacket(packets[i]);
        }
}

static unsigned int ether_thread_get_packets_nt(void *arg)
{
        static uint8 packet[1514];
        int i, packet_sz = 0;

        thread_active_2 = true;

        D(bug("ether_thread_get_packets_nt start\n"));

        // Wait for packets to arrive.
        // Obey the golden rules; keep the reads pending.
        while(thread_active) {

                if(net_if_type == NET_IF_B2ETHER) {
                        D(bug("Pending reads\n"));
                        for( i=0; thread_active && i<PACKET_POOL_COUNT; i++ ) {
                                if(packets[i]->free) {
                                        packets[i]->free = FALSE;
                                        if(PacketReceivePacket(fd,packets[i],FALSE)) {
                                                if(packets[i]->bIoComplete) {
                                                        D(bug("Early io completion...\n"));
                                                        packet_read_completion(
                                                                ERROR_SUCCESS,
                                                                packets[i]->BytesReceived,
                                                                &packets[i]->OverLapped
                                                                );
                                                }
                                        } else {
                                                packets[i]->free = TRUE;
                                        }
                                }
                        }
                }

                if(thread_active && has_no_completed_io()) {
                        D(bug("Waiting for int_sig2\n"));
                        // "problem": awakens twice in a row. Fix if you increase the pool size.
                        WaitForSingleObjectEx(int_sig2,INFINITE,TRUE);
                }
        }

        D(bug("ether_thread_get_packets_nt exit\n"));

        thread_active_2 = false;

        return 0;
}

static unsigned int ether_thread_feed_int(void *arg)
{
        bool looping;

        thread_active_3 = true;

        D(bug("ether_thread_feed_int start\n"));

        while(thread_active) {
                D(bug("Waiting for int_sig\n"));
                WaitForSingleObject(int_sig,INFINITE);
                // Looping this way to avoid a race condition.
                D(bug("Triggering\n"));
                looping = true;
                while(thread_active && looping) {
                        trigger_queue();
                        // Wait for interrupt acknowledge by EtherInterrupt()
                        WaitForSingleObject(int_ack,INFINITE);
                        if(thread_active) looping = set_wait_request();
                }
                D(bug("Queue empty.\n"));
        }

        D(bug("ether_thread_feed_int exit\n"));

        thread_active_3 = false;

        return 0;
}


/*
 *  Ethernet interrupt - activate deferred tasks to call IODone or protocol handlers
 */

static void ether_do_interrupt(void)
{
        // Call protocol handler for received packets
        EthernetPacket ether_packet;
        uint32 packet = ether_packet.addr();
        ssize_t length;
        for (;;) {

                // Read packet from Ethernet device
                length = dequeue_packet(Mac2HostAddr(packet));
                if (length < 14)
                        break;

#if MONITOR
                bug("Receiving Ethernet packet (%d bytes):\n",(int)length);
                dump_packet( Mac2HostAddr(packet), length );
#endif

                // Dispatch packet
                ether_dispatch_packet(packet, length);
        }
}

#if DEBUG
#pragma optimize("",on)
#endif
Revision:	1.5
Committed:	2006-04-23T15:36:51Z (18 years, 5 months ago) by gbeauche
Branch:	MAIN
Changes since 1.4:	+132 -122 lines
Log Message:	Some clean-ups. Rewrite ethernet config interpreter. This implies some prefs items changes but it should now be simpler to add other ethernet emulation means (slirp, tap-win32). # Basilisk II driver mode ether {guid} becomes ether b2ether etherguid {guid} # Basilisk II Router mode routerenabled true becomes ether router