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sbni.c

/* sbni.c:  Granch SBNI12 leased line adapters driver for linux
 *
 *    Written 2001 by Denis I.Timofeev (timofeev@granch.ru)
 *
 *    Previous versions were written by Yaroslav Polyakov,
 *    Alexey Zverev and Max Khon.
 *
 *    Driver supports SBNI12-02,-04,-05,-10,-11 cards, single and
 *    double-channel, PCI and ISA modifications.
 *    More info and useful utilities to work with SBNI12 cards you can find
 *    at http://www.granch.com (English) or http://www.granch.ru (Russian)
 *
 *    This software may be used and distributed according to the terms
 *    of the GNU General Public License.
 *
 *
 *  5.0.1   Jun 22 2001
 *      - Fixed bug in probe
 *  5.0.0   Jun 06 2001
 *      - Driver was completely redesigned by Denis I.Timofeev,
 *      - now PCI/Dual, ISA/Dual (with single interrupt line) models are
 *      - supported
 *  3.3.0   Thu Feb 24 21:30:28 NOVT 2000 
 *        - PCI cards support
 *  3.2.0   Mon Dec 13 22:26:53 NOVT 1999
 *      - Completely rebuilt all the packet storage system
 *      -    to work in Ethernet-like style.
 *  3.1.1   just fixed some bugs (5 aug 1999)
 *  3.1.0   added balancing feature (26 apr 1999)
 *  3.0.1   just fixed some bugs (14 apr 1999).
 *  3.0.0   Initial Revision, Yaroslav Polyakov (24 Feb 1999)
 *        - added pre-calculation for CRC, fixed bug with "len-2" frames, 
 *        - removed outbound fragmentation (MTU=1000), written CRC-calculation 
 *        - on asm, added work with hard_headers and now we have our own cache 
 *        - for them, optionally supported word-interchange on some chipsets,
 * 
 *    Known problem: this driver wasn't tested on multiprocessor machine.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ptrace.h>
#include <linux/fcntl.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/pci.h>
#include <linux/skbuff.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/delay.h>

#include <net/net_namespace.h>
#include <net/arp.h>

#include <asm/io.h>
#include <asm/types.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>

#include "sbni.h"

/* device private data */

struct net_local {
      struct net_device_stats stats;
      struct timer_list watchdog;

      spinlock_t  lock;
      struct sk_buff  *rx_buf_p;          /* receive buffer ptr */
      struct sk_buff  *tx_buf_p;          /* transmit buffer ptr */
      
      unsigned int      framelen;         /* current frame length */
      unsigned int      maxframe;         /* maximum valid frame length */
      unsigned int      state;
      unsigned int      inppos, outpos;         /* positions in rx/tx buffers */

      /* transmitting frame number - from frames qty to 1 */
      unsigned int      tx_frameno;

      /* expected number of next receiving frame */
      unsigned int      wait_frameno;

      /* count of failed attempts to frame send - 32 attempts do before
         error - while receiver tunes on opposite side of wire */
      unsigned int      trans_errors;

      /* idle time; send pong when limit exceeded */
      unsigned int      timer_ticks;

      /* fields used for receive level autoselection */
      int   delta_rxl;
      unsigned int      cur_rxl_index, timeout_rxl;
      unsigned long     cur_rxl_rcvd, prev_rxl_rcvd;

      struct sbni_csr1  csr1;       /* current value of CSR1 */
      struct sbni_in_stats    in_stats;   /* internal statistics */ 

      struct net_device       *second;    /* for ISA/dual cards */

#ifdef CONFIG_SBNI_MULTILINE
      struct net_device       *master;
      struct net_device       *link;
#endif
};


static int  sbni_card_probe( unsigned long );
static int  sbni_pci_probe( struct net_device  * );
static struct net_device  *sbni_probe1(struct net_device *, unsigned long, int);
static int  sbni_open( struct net_device * );
static int  sbni_close( struct net_device * );
static int  sbni_start_xmit( struct sk_buff *, struct net_device * );
static int  sbni_ioctl( struct net_device *, struct ifreq *, int );
static struct net_device_stats  *sbni_get_stats( struct net_device * );
static void  set_multicast_list( struct net_device * );

static irqreturn_t sbni_interrupt( int, void * );
static void  handle_channel( struct net_device * );
static int   recv_frame( struct net_device * );
static void  send_frame( struct net_device * );
static int   upload_data( struct net_device *,
                    unsigned, unsigned, unsigned, u32 );
static void  download_data( struct net_device *, u32 * );
static void  sbni_watchdog( unsigned long );
static void  interpret_ack( struct net_device *, unsigned );
static int   append_frame_to_pkt( struct net_device *, unsigned, u32 );
static void  indicate_pkt( struct net_device * );
static void  card_start( struct net_device * );
static void  prepare_to_send( struct sk_buff *, struct net_device * );
static void  drop_xmit_queue( struct net_device * );
static void  send_frame_header( struct net_device *, u32 * );
static int   skip_tail( unsigned int, unsigned int, u32 );
static int   check_fhdr( u32, u32 *, u32 *, u32 *, u32 *, u32 * );
static void  change_level( struct net_device * );
static void  timeout_change_level( struct net_device * );
static u32   calc_crc32( u32, u8 *, u32 );
static struct sk_buff *  get_rx_buf( struct net_device * );
static int  sbni_init( struct net_device * );

#ifdef CONFIG_SBNI_MULTILINE
static int  enslave( struct net_device *, struct net_device * );
static int  emancipate( struct net_device * );
#endif

#ifdef __i386__
#define ASM_CRC 1
#endif

static const char  version[] =
      "Granch SBNI12 driver ver 5.0.1  Jun 22 2001  Denis I.Timofeev.\n";

static int  skip_pci_probe    __initdata = 0;
static int  scandone    __initdata = 0;
static int  num         __initdata = 0;

static unsigned char  rxl_tab[];
static u32  crc32tab[];

/* A list of all installed devices, for removing the driver module. */
static struct net_device  *sbni_cards[ SBNI_MAX_NUM_CARDS ];

/* Lists of device's parameters */
static u32  io[   SBNI_MAX_NUM_CARDS ] __initdata =
      { [0 ... SBNI_MAX_NUM_CARDS-1] = -1 };
static u32  irq[  SBNI_MAX_NUM_CARDS ] __initdata;
static u32  baud[ SBNI_MAX_NUM_CARDS ] __initdata;
static u32  rxl[  SBNI_MAX_NUM_CARDS ] __initdata =
      { [0 ... SBNI_MAX_NUM_CARDS-1] = -1 };
static u32  mac[  SBNI_MAX_NUM_CARDS ] __initdata;

#ifndef MODULE
typedef u32  iarr[];
static iarr __initdata *dest[5] = { &io, &irq, &baud, &rxl, &mac };
#endif

/* A zero-terminated list of I/O addresses to be probed on ISA bus */
static unsigned int  netcard_portlist[ ] __initdata = { 
      0x210, 0x214, 0x220, 0x224, 0x230, 0x234, 0x240, 0x244, 0x250, 0x254,
      0x260, 0x264, 0x270, 0x274, 0x280, 0x284, 0x290, 0x294, 0x2a0, 0x2a4,
      0x2b0, 0x2b4, 0x2c0, 0x2c4, 0x2d0, 0x2d4, 0x2e0, 0x2e4, 0x2f0, 0x2f4,
      0 };


/*
 * Look for SBNI card which addr stored in dev->base_addr, if nonzero.
 * Otherwise, look through PCI bus. If none PCI-card was found, scan ISA.
 */

static inline int __init
sbni_isa_probe( struct net_device  *dev )
{
      if( dev->base_addr > 0x1ff
          &&  request_region( dev->base_addr, SBNI_IO_EXTENT, dev->name )
          &&  sbni_probe1( dev, dev->base_addr, dev->irq ) )

            return  0;
      else {
            printk( KERN_ERR "sbni: base address 0x%lx is busy, or adapter "
                  "is malfunctional!\n", dev->base_addr );
            return  -ENODEV;
      }
}

static void __init sbni_devsetup(struct net_device *dev)
{
      ether_setup( dev );
      dev->open         = &sbni_open;
      dev->stop         = &sbni_close;
      dev->hard_start_xmit    = &sbni_start_xmit;
      dev->get_stats          = &sbni_get_stats;
      dev->set_multicast_list = &set_multicast_list;
      dev->do_ioctl           = &sbni_ioctl;
}

int __init sbni_probe(int unit)
{
      struct net_device *dev;
      static unsigned  version_printed __initdata = 0;
      int err;

      dev = alloc_netdev(sizeof(struct net_local), "sbni", sbni_devsetup);
      if (!dev)
            return -ENOMEM;

      sprintf(dev->name, "sbni%d", unit);
      netdev_boot_setup_check(dev);

      err = sbni_init(dev);
      if (err) {
            free_netdev(dev);
            return err;
      }

      err = register_netdev(dev);
      if (err) {
            release_region( dev->base_addr, SBNI_IO_EXTENT );
            free_netdev(dev);
            return err;
      }
      if( version_printed++ == 0 )
            printk( KERN_INFO "%s", version );
      return 0;
}

static int __init sbni_init(struct net_device *dev)
{
      int  i;
      if( dev->base_addr )
            return  sbni_isa_probe( dev );
      /* otherwise we have to perform search our adapter */

      if( io[ num ] != -1 )
            dev->base_addr    = io[ num ],
            dev->irq    = irq[ num ];
      else if( scandone  ||  io[ 0 ] != -1 )
            return  -ENODEV;

      /* if io[ num ] contains non-zero address, then that is on ISA bus */
      if( dev->base_addr )
            return  sbni_isa_probe( dev );

      /* ...otherwise - scan PCI first */
      if( !skip_pci_probe  &&  !sbni_pci_probe( dev ) )
            return  0;

      if( io[ num ] == -1 ) {
            /* Auto-scan will be stopped when first ISA card were found */
            scandone = 1;
            if( num > 0 )
                  return  -ENODEV;
      }

      for( i = 0;  netcard_portlist[ i ];  ++i ) {
            int  ioaddr = netcard_portlist[ i ];
            if( request_region( ioaddr, SBNI_IO_EXTENT, dev->name )
                &&  sbni_probe1( dev, ioaddr, 0 ))
                  return 0;
      }

      return  -ENODEV;
}


int __init
sbni_pci_probe( struct net_device  *dev )
{
      struct pci_dev  *pdev = NULL;

      while( (pdev = pci_get_class( PCI_CLASS_NETWORK_OTHER << 8, pdev ))
             != NULL ) {
            int  pci_irq_line;
            unsigned long  pci_ioaddr;
            u16  subsys;

            if( pdev->vendor != SBNI_PCI_VENDOR
                &&  pdev->device != SBNI_PCI_DEVICE )
                        continue;

            pci_ioaddr = pci_resource_start( pdev, 0 );
            pci_irq_line = pdev->irq;

            /* Avoid already found cards from previous calls */
            if( !request_region( pci_ioaddr, SBNI_IO_EXTENT, dev->name ) ) {
                  pci_read_config_word( pdev, PCI_SUBSYSTEM_ID, &subsys );

                  if (subsys != 2)
                        continue;

                  /* Dual adapter is present */
                  if (!request_region(pci_ioaddr += 4, SBNI_IO_EXTENT,
                                          dev->name ) )
                        continue;
            }

            if( pci_irq_line <= 0  ||  pci_irq_line >= NR_IRQS )
                  printk( KERN_WARNING "  WARNING: The PCI BIOS assigned "
                        "this PCI card to IRQ %d, which is unlikely "
                        "to work!.\n"
                        KERN_WARNING " You should use the PCI BIOS "
                        "setup to assign a valid IRQ line.\n",
                        pci_irq_line );

            /* avoiding re-enable dual adapters */
            if( (pci_ioaddr & 7) == 0  &&  pci_enable_device( pdev ) ) {
                  release_region( pci_ioaddr, SBNI_IO_EXTENT );
                  pci_dev_put( pdev );
                  return  -EIO;
            }
            if( sbni_probe1( dev, pci_ioaddr, pci_irq_line ) ) {
                  SET_NETDEV_DEV(dev, &pdev->dev);
                  /* not the best thing to do, but this is all messed up 
                     for hotplug systems anyway... */
                  pci_dev_put( pdev );
                  return  0;
            }
      }
      return  -ENODEV;
}


static struct net_device * __init
sbni_probe1( struct net_device  *dev,  unsigned long  ioaddr,  int  irq )
{
      struct net_local  *nl;

      if( sbni_card_probe( ioaddr ) ) {
            release_region( ioaddr, SBNI_IO_EXTENT );
            return NULL;
      }

      outb( 0, ioaddr + CSR0 );

      if( irq < 2 ) {
            unsigned long irq_mask;

            irq_mask = probe_irq_on();
            outb( EN_INT | TR_REQ, ioaddr + CSR0 );
            outb( PR_RES, ioaddr + CSR1 );
            mdelay(50);
            irq = probe_irq_off(irq_mask);
            outb( 0, ioaddr + CSR0 );

            if( !irq ) {
                  printk( KERN_ERR "%s: can't detect device irq!\n",
                        dev->name );
                  release_region( ioaddr, SBNI_IO_EXTENT );
                  return NULL;
            }
      } else if( irq == 2 )
            irq = 9;

      dev->irq = irq;
      dev->base_addr = ioaddr;

      /* Allocate dev->priv and fill in sbni-specific dev fields. */
      nl = dev->priv;
      if( !nl ) {
            printk( KERN_ERR "%s: unable to get memory!\n", dev->name );
            release_region( ioaddr, SBNI_IO_EXTENT );
            return NULL;
      }

      dev->priv = nl;
      memset( nl, 0, sizeof(struct net_local) );
      spin_lock_init( &nl->lock );

      /* store MAC address (generate if that isn't known) */
      *(u16 *)dev->dev_addr = htons( 0x00ff );
      *(u32 *)(dev->dev_addr + 2) = htonl( 0x01000000 |
            ( (mac[num]  ?  mac[num]  :  (u32)((long)dev->priv)) & 0x00ffffff) );

      /* store link settings (speed, receive level ) */
      nl->maxframe  = DEFAULT_FRAME_LEN;
      nl->csr1.rate = baud[ num ];

      if( (nl->cur_rxl_index = rxl[ num ]) == -1 )
            /* autotune rxl */
            nl->cur_rxl_index = DEF_RXL,
            nl->delta_rxl = DEF_RXL_DELTA;
      else
            nl->delta_rxl = 0;
      nl->csr1.rxl  = rxl_tab[ nl->cur_rxl_index ];
      if( inb( ioaddr + CSR0 ) & 0x01 )
            nl->state |= FL_SLOW_MODE;

      printk( KERN_NOTICE "%s: ioaddr %#lx, irq %d, "
            "MAC: 00:ff:01:%02x:%02x:%02x\n", 
            dev->name, dev->base_addr, dev->irq,
            ((u8 *) dev->dev_addr) [3],
            ((u8 *) dev->dev_addr) [4],
            ((u8 *) dev->dev_addr) [5] );

      printk( KERN_NOTICE "%s: speed %d, receive level ", dev->name,
            ( (nl->state & FL_SLOW_MODE)  ?  500000 : 2000000)
            / (1 << nl->csr1.rate) );

      if( nl->delta_rxl == 0 )
            printk( "0x%x (fixed)\n", nl->cur_rxl_index ); 
      else
            printk( "(auto)\n");

#ifdef CONFIG_SBNI_MULTILINE
      nl->master = dev;
      nl->link   = NULL;
#endif
   
      sbni_cards[ num++ ] = dev;
      return  dev;
}

/* -------------------------------------------------------------------------- */

#ifdef CONFIG_SBNI_MULTILINE

static int
sbni_start_xmit( struct sk_buff  *skb,  struct net_device  *dev )
{
      struct net_device  *p;

      netif_stop_queue( dev );

      /* Looking for idle device in the list */
      for( p = dev;  p; ) {
            struct net_local  *nl = (struct net_local *) p->priv;
            spin_lock( &nl->lock );
            if( nl->tx_buf_p  ||  (nl->state & FL_LINE_DOWN) ) {
                  p = nl->link;
                  spin_unlock( &nl->lock );
            } else {
                  /* Idle dev is found */
                  prepare_to_send( skb, p );
                  spin_unlock( &nl->lock );
                  netif_start_queue( dev );
                  return  0;
            }
      }

      return  1;
}

#else /* CONFIG_SBNI_MULTILINE */

static int
sbni_start_xmit( struct sk_buff  *skb,  struct net_device  *dev )
{
      struct net_local  *nl  = (struct net_local *) dev->priv;

      netif_stop_queue( dev );
      spin_lock( &nl->lock );

      prepare_to_send( skb, dev );

      spin_unlock( &nl->lock );
      return  0;
}

#endif      /* CONFIG_SBNI_MULTILINE */

/* -------------------------------------------------------------------------- */

/* interrupt handler */

/*
 *    SBNI12D-10, -11/ISA boards within "common interrupt" mode could not
 * be looked as two independent single-channel devices. Every channel seems
 * as Ethernet interface but interrupt handler must be common. Really, first
 * channel ("master") driver only registers the handler. In its struct net_local
 * it has got pointer to "slave" channel's struct net_local and handles that's
 * interrupts too.
 *    dev of successfully attached ISA SBNI boards is linked to list.
 * While next board driver is initialized, it scans this list. If one
 * has found dev with same irq and ioaddr different by 4 then it assumes
 * this board to be "master".
 */ 

static irqreturn_t
sbni_interrupt( int  irq,  void  *dev_id )
{
      struct net_device   *dev = dev_id;
      struct net_local  *nl  = dev->priv;
      int   repeat;

      spin_lock( &nl->lock );
      if( nl->second )
            spin_lock( &((struct net_local *) nl->second->priv)->lock );

      do {
            repeat = 0;
            if( inb( dev->base_addr + CSR0 ) & (RC_RDY | TR_RDY) )
                  handle_channel( dev ),
                  repeat = 1;
            if( nl->second  &&      /* second channel present */
                (inb( nl->second->base_addr+CSR0 ) & (RC_RDY | TR_RDY)) )
                  handle_channel( nl->second ),
                  repeat = 1;
      } while( repeat );

      if( nl->second )
            spin_unlock( &((struct net_local *)nl->second->priv)->lock );
      spin_unlock( &nl->lock );
      return IRQ_HANDLED;
}


static void
handle_channel( struct net_device  *dev )
{
      struct net_local  *nl    = (struct net_local *) dev->priv;
      unsigned long           ioaddr = dev->base_addr;

      int  req_ans;
      unsigned char  csr0;

#ifdef CONFIG_SBNI_MULTILINE
      /* Lock the master device because we going to change its local data */
      if( nl->state & FL_SLAVE )
            spin_lock( &((struct net_local *) nl->master->priv)->lock );
#endif

      outb( (inb( ioaddr + CSR0 ) & ~EN_INT) | TR_REQ, ioaddr + CSR0 );

      nl->timer_ticks = CHANGE_LEVEL_START_TICKS;
      for(;;) {
            csr0 = inb( ioaddr + CSR0 );
            if( ( csr0 & (RC_RDY | TR_RDY) ) == 0 )
                  break;

            req_ans = !(nl->state & FL_PREV_OK);

            if( csr0 & RC_RDY )
                  req_ans = recv_frame( dev );

            /*
             * TR_RDY always equals 1 here because we have owned the marker,
             * and we set TR_REQ when disabled interrupts
             */
            csr0 = inb( ioaddr + CSR0 );
            if( !(csr0 & TR_RDY)  ||  (csr0 & RC_RDY) )
                  printk( KERN_ERR "%s: internal error!\n", dev->name );

            /* if state & FL_NEED_RESEND != 0 then tx_frameno != 0 */
            if( req_ans  ||  nl->tx_frameno != 0 )
                  send_frame( dev );
            else
                  /* send marker without any data */
                  outb( inb( ioaddr + CSR0 ) & ~TR_REQ, ioaddr + CSR0 );
      }

      outb( inb( ioaddr + CSR0 ) | EN_INT, ioaddr + CSR0 );

#ifdef CONFIG_SBNI_MULTILINE
      if( nl->state & FL_SLAVE )
            spin_unlock( &((struct net_local *) nl->master->priv)->lock );
#endif
}


/*
 * Routine returns 1 if it need to acknoweledge received frame.
 * Empty frame received without errors won't be acknoweledged.
 */

static int
recv_frame( struct net_device  *dev )
{
      struct net_local  *nl   = (struct net_local *) dev->priv;
      unsigned long  ioaddr   = dev->base_addr;

      u32  crc = CRC32_INITIAL;

      unsigned  framelen = 0, frameno, ack;
      unsigned  is_first, frame_ok = 0;

      if( check_fhdr( ioaddr, &framelen, &frameno, &ack, &is_first, &crc ) ) {
            frame_ok = framelen > 4
                  ?  upload_data( dev, framelen, frameno, is_first, crc )
                  :  skip_tail( ioaddr, framelen, crc );
            if( frame_ok )
                  interpret_ack( dev, ack );
      }

      outb( inb( ioaddr + CSR0 ) ^ CT_ZER, ioaddr + CSR0 );
      if( frame_ok ) {
            nl->state |= FL_PREV_OK;
            if( framelen > 4 )
                  nl->in_stats.all_rx_number++;
      } else
            nl->state &= ~FL_PREV_OK,
            change_level( dev ),
            nl->in_stats.all_rx_number++,
            nl->in_stats.bad_rx_number++;

      return  !frame_ok  ||  framelen > 4;
}


static void
send_frame( struct net_device  *dev )
{
      struct net_local  *nl    = (struct net_local *) dev->priv;

      u32  crc = CRC32_INITIAL;

      if( nl->state & FL_NEED_RESEND ) {

            /* if frame was sended but not ACK'ed - resend it */
            if( nl->trans_errors ) {
                  --nl->trans_errors;
                  if( nl->framelen != 0 )
                        nl->in_stats.resend_tx_number++;
            } else {
                  /* cannot xmit with many attempts */
#ifdef CONFIG_SBNI_MULTILINE
                  if( (nl->state & FL_SLAVE)  ||  nl->link )
#endif
                  nl->state |= FL_LINE_DOWN;
                  drop_xmit_queue( dev );
                  goto  do_send;
            }
      } else
            nl->trans_errors = TR_ERROR_COUNT;

      send_frame_header( dev, &crc );
      nl->state |= FL_NEED_RESEND;
      /*
       * FL_NEED_RESEND will be cleared after ACK, but if empty
       * frame sended then in prepare_to_send next frame
       */


      if( nl->framelen ) {
            download_data( dev, &crc );
            nl->in_stats.all_tx_number++;
            nl->state |= FL_WAIT_ACK;
      }

      outsb( dev->base_addr + DAT, (u8 *)&crc, sizeof crc );

do_send:
      outb( inb( dev->base_addr + CSR0 ) & ~TR_REQ, dev->base_addr + CSR0 );

      if( nl->tx_frameno )
            /* next frame exists - we request card to send it */
            outb( inb( dev->base_addr + CSR0 ) | TR_REQ,
                  dev->base_addr + CSR0 );
}


/*
 * Write the frame data into adapter's buffer memory, and calculate CRC.
 * Do padding if necessary.
 */

static void
download_data( struct net_device  *dev,  u32  *crc_p )
{
      struct net_local  *nl    = (struct net_local *) dev->priv;
      struct sk_buff    *skb   = nl->tx_buf_p;

      unsigned  len = min_t(unsigned int, skb->len - nl->outpos, nl->framelen);

      outsb( dev->base_addr + DAT, skb->data + nl->outpos, len );
      *crc_p = calc_crc32( *crc_p, skb->data + nl->outpos, len );

      /* if packet too short we should write some more bytes to pad */
      for( len = nl->framelen - len;  len--; )
            outb( 0, dev->base_addr + DAT ),
            *crc_p = CRC32( 0, *crc_p );
}


static int
upload_data( struct net_device  *dev,  unsigned  framelen,  unsigned  frameno,
           unsigned  is_first,  u32  crc )
{
      struct net_local  *nl = (struct net_local *) dev->priv;

      int  frame_ok;

      if( is_first )
            nl->wait_frameno = frameno,
            nl->inppos = 0;

      if( nl->wait_frameno == frameno ) {

            if( nl->inppos + framelen  <=  ETHER_MAX_LEN )
                  frame_ok = append_frame_to_pkt( dev, framelen, crc );

            /*
             * if CRC is right but framelen incorrect then transmitter
             * error was occurred... drop entire packet
             */
            else if( (frame_ok = skip_tail( dev->base_addr, framelen, crc ))
                   != 0 )
                  nl->wait_frameno = 0,
                  nl->inppos = 0,
#ifdef CONFIG_SBNI_MULTILINE
                  ((struct net_local *) nl->master->priv)
                        ->stats.rx_errors++,
                  ((struct net_local *) nl->master->priv)
                        ->stats.rx_missed_errors++;
#else
                  nl->stats.rx_errors++,
                  nl->stats.rx_missed_errors++;
#endif
                  /* now skip all frames until is_first != 0 */
      } else
            frame_ok = skip_tail( dev->base_addr, framelen, crc );

      if( is_first  &&  !frame_ok )
            /*
             * Frame has been broken, but we had already stored
             * is_first... Drop entire packet.
             */
            nl->wait_frameno = 0,
#ifdef CONFIG_SBNI_MULTILINE
            ((struct net_local *) nl->master->priv)->stats.rx_errors++,
            ((struct net_local *) nl->master->priv)->stats.rx_crc_errors++;
#else
            nl->stats.rx_errors++,
            nl->stats.rx_crc_errors++;
#endif

      return  frame_ok;
}


static __inline void
send_complete( struct net_local  *nl )
{
#ifdef CONFIG_SBNI_MULTILINE
      ((struct net_local *) nl->master->priv)->stats.tx_packets++;
      ((struct net_local *) nl->master->priv)->stats.tx_bytes
            += nl->tx_buf_p->len;
#else
      nl->stats.tx_packets++;
      nl->stats.tx_bytes += nl->tx_buf_p->len;
#endif
      dev_kfree_skb_irq( nl->tx_buf_p );

      nl->tx_buf_p = NULL;

      nl->outpos = 0;
      nl->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);
      nl->framelen   = 0;
}


static void
interpret_ack( struct net_device  *dev,  unsigned  ack )
{
      struct net_local  *nl = (struct net_local *) dev->priv;

      if( ack == FRAME_SENT_OK ) {
            nl->state &= ~FL_NEED_RESEND;

            if( nl->state & FL_WAIT_ACK ) {
                  nl->outpos += nl->framelen;

                  if( --nl->tx_frameno )
                        nl->framelen = min_t(unsigned int,
                                       nl->maxframe,
                                       nl->tx_buf_p->len - nl->outpos);
                  else
                        send_complete( nl ),
#ifdef CONFIG_SBNI_MULTILINE
                        netif_wake_queue( nl->master );
#else
                        netif_wake_queue( dev );
#endif
            }
      }

      nl->state &= ~FL_WAIT_ACK;
}


/*
 * Glue received frame with previous fragments of packet.
 * Indicate packet when last frame would be accepted.
 */

static int
append_frame_to_pkt( struct net_device  *dev,  unsigned  framelen,  u32  crc )
{
      struct net_local  *nl = (struct net_local *) dev->priv;

      u8  *p;

      if( nl->inppos + framelen  >  ETHER_MAX_LEN )
            return  0;

      if( !nl->rx_buf_p  &&  !(nl->rx_buf_p = get_rx_buf( dev )) )
            return  0;

      p = nl->rx_buf_p->data + nl->inppos;
      insb( dev->base_addr + DAT, p, framelen );
      if( calc_crc32( crc, p, framelen ) != CRC32_REMAINDER )
            return  0;

      nl->inppos += framelen - 4;
      if( --nl->wait_frameno == 0 )       /* last frame received */
            indicate_pkt( dev );

      return  1;
}


/*
 * Prepare to start output on adapter.
 * Transmitter will be actually activated when marker is accepted.
 */

static void
prepare_to_send( struct sk_buff  *skb,  struct net_device  *dev )
{
      struct net_local  *nl = (struct net_local *) dev->priv;

      unsigned int  len;

      /* nl->tx_buf_p == NULL here! */
      if( nl->tx_buf_p )
            printk( KERN_ERR "%s: memory leak!\n", dev->name );

      nl->outpos = 0;
      nl->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);

      len = skb->len;
      if( len < SBNI_MIN_LEN )
            len = SBNI_MIN_LEN;

      nl->tx_buf_p      = skb;
      nl->tx_frameno    = (len + nl->maxframe - 1) / nl->maxframe;
      nl->framelen      = len < nl->maxframe  ?  len  :  nl->maxframe;

      outb( inb( dev->base_addr + CSR0 ) | TR_REQ,  dev->base_addr + CSR0 );
#ifdef CONFIG_SBNI_MULTILINE
      nl->master->trans_start = jiffies;
#else
      dev->trans_start = jiffies;
#endif
}


static void
drop_xmit_queue( struct net_device  *dev )
{
      struct net_local  *nl = (struct net_local *) dev->priv;

      if( nl->tx_buf_p )
            dev_kfree_skb_any( nl->tx_buf_p ),
            nl->tx_buf_p = NULL,
#ifdef CONFIG_SBNI_MULTILINE
            ((struct net_local *) nl->master->priv)
                  ->stats.tx_errors++,
            ((struct net_local *) nl->master->priv)
                  ->stats.tx_carrier_errors++;
#else
            nl->stats.tx_errors++,
            nl->stats.tx_carrier_errors++;
#endif

      nl->tx_frameno    = 0;
      nl->framelen      = 0;
      nl->outpos  = 0;
      nl->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);
#ifdef CONFIG_SBNI_MULTILINE
      netif_start_queue( nl->master );
      nl->master->trans_start = jiffies;
#else
      netif_start_queue( dev );
      dev->trans_start = jiffies;
#endif
}


static void
send_frame_header( struct net_device  *dev,  u32  *crc_p )
{
      struct net_local  *nl  = (struct net_local *) dev->priv;

      u32  crc = *crc_p;
      u32  len_field = nl->framelen + 6;  /* CRC + frameno + reserved */
      u8   value;

      if( nl->state & FL_NEED_RESEND )
            len_field |= FRAME_RETRY;     /* non-first attempt... */

      if( nl->outpos == 0 )
            len_field |= FRAME_FIRST;

      len_field |= (nl->state & FL_PREV_OK) ? FRAME_SENT_OK : FRAME_SENT_BAD;
      outb( SBNI_SIG, dev->base_addr + DAT );

      value = (u8) len_field;
      outb( value, dev->base_addr + DAT );
      crc = CRC32( value, crc );
      value = (u8) (len_field >> 8);
      outb( value, dev->base_addr + DAT );
      crc = CRC32( value, crc );

      outb( nl->tx_frameno, dev->base_addr + DAT );
      crc = CRC32( nl->tx_frameno, crc );
      outb( 0, dev->base_addr + DAT );
      crc = CRC32( 0, crc );
      *crc_p = crc;
}


/*
 * if frame tail not needed (incorrect number or received twice),
 * it won't store, but CRC will be calculated
 */

static int
skip_tail( unsigned int  ioaddr,  unsigned int  tail_len,  u32 crc )
{
      while( tail_len-- )
            crc = CRC32( inb( ioaddr + DAT ), crc );

      return  crc == CRC32_REMAINDER;
}


/*
 * Preliminary checks if frame header is correct, calculates its CRC
 * and split it to simple fields
 */

static int
check_fhdr( u32  ioaddr,  u32  *framelen,  u32  *frameno,  u32  *ack,
          u32  *is_first,  u32  *crc_p )
{
      u32  crc = *crc_p;
      u8   value;

      if( inb( ioaddr + DAT ) != SBNI_SIG )
            return  0;

      value = inb( ioaddr + DAT );
      *framelen = (u32)value;
      crc = CRC32( value, crc );
      value = inb( ioaddr + DAT );
      *framelen |= ((u32)value) << 8;
      crc = CRC32( value, crc );

      *ack = *framelen & FRAME_ACK_MASK;
      *is_first = (*framelen & FRAME_FIRST) != 0;

      if( (*framelen &= FRAME_LEN_MASK) < 6
          ||  *framelen > SBNI_MAX_FRAME - 3 )
            return  0;

      value = inb( ioaddr + DAT );
      *frameno = (u32)value;
      crc = CRC32( value, crc );

      crc = CRC32( inb( ioaddr + DAT ), crc );  /* reserved byte */
      *framelen -= 2;

      *crc_p = crc;
      return  1;
}


static struct sk_buff *
get_rx_buf( struct net_device  *dev )
{
      /* +2 is to compensate for the alignment fixup below */
      struct sk_buff  *skb = dev_alloc_skb( ETHER_MAX_LEN + 2 );
      if( !skb )
            return  NULL;

      skb_reserve( skb, 2 );        /* Align IP on longword boundaries */
      return  skb;
}


static void
indicate_pkt( struct net_device  *dev )
{
      struct net_local  *nl  = (struct net_local *) dev->priv;
      struct sk_buff    *skb = nl->rx_buf_p;

      skb_put( skb, nl->inppos );

#ifdef CONFIG_SBNI_MULTILINE
      skb->protocol = eth_type_trans( skb, nl->master );
      netif_rx( skb );
      dev->last_rx = jiffies;
      ++((struct net_local *) nl->master->priv)->stats.rx_packets;
      ((struct net_local *) nl->master->priv)->stats.rx_bytes += nl->inppos;
#else
      skb->protocol = eth_type_trans( skb, dev );
      netif_rx( skb );
      dev->last_rx = jiffies;
      ++nl->stats.rx_packets;
      nl->stats.rx_bytes += nl->inppos;
#endif
      nl->rx_buf_p = NULL;    /* protocol driver will clear this sk_buff */
}


/* -------------------------------------------------------------------------- */

/*
 * Routine checks periodically wire activity and regenerates marker if
 * connect was inactive for a long time.
 */

static void
sbni_watchdog( unsigned long  arg )
{
      struct net_device  *dev = (struct net_device *) arg;
      struct net_local   *nl  = (struct net_local *) dev->priv;
      struct timer_list  *w   = &nl->watchdog; 
      unsigned long        flags;
      unsigned char        csr0;

      spin_lock_irqsave( &nl->lock, flags );

      csr0 = inb( dev->base_addr + CSR0 );
      if( csr0 & RC_CHK ) {

            if( nl->timer_ticks ) {
                  if( csr0 & (RC_RDY | BU_EMP) )
                        /* receiving not active */
                        nl->timer_ticks--;
            } else {
                  nl->in_stats.timeout_number++;
                  if( nl->delta_rxl )
                        timeout_change_level( dev );

                  outb( *(u_char *)&nl->csr1 | PR_RES,
                        dev->base_addr + CSR1 );
                  csr0 = inb( dev->base_addr + CSR0 );
            }
      } else
            nl->state &= ~FL_LINE_DOWN;

      outb( csr0 | RC_CHK, dev->base_addr + CSR0 ); 

      init_timer( w );
      w->expires  = jiffies + SBNI_TIMEOUT;
      w->data           = arg;
      w->function = sbni_watchdog;
      add_timer( w );

      spin_unlock_irqrestore( &nl->lock, flags );
}


static unsigned char  rxl_tab[] = {
      0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08,
      0x0a, 0x0c, 0x0f, 0x16, 0x18, 0x1a, 0x1c, 0x1f
};

#define SIZE_OF_TIMEOUT_RXL_TAB 4
static unsigned char  timeout_rxl_tab[] = {
      0x03, 0x05, 0x08, 0x0b
};

/* -------------------------------------------------------------------------- */

static void
card_start( struct net_device  *dev )
{
      struct net_local  *nl = (struct net_local *) dev->priv;

      nl->timer_ticks = CHANGE_LEVEL_START_TICKS;
      nl->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);
      nl->state |= FL_PREV_OK;

      nl->inppos = nl->outpos = 0;
      nl->wait_frameno = 0;
      nl->tx_frameno     = 0;
      nl->framelen       = 0;

      outb( *(u_char *)&nl->csr1 | PR_RES, dev->base_addr + CSR1 );
      outb( EN_INT, dev->base_addr + CSR0 );
}

/* -------------------------------------------------------------------------- */

/* Receive level auto-selection */

static void
change_level( struct net_device  *dev )
{
      struct net_local  *nl = (struct net_local *) dev->priv;

      if( nl->delta_rxl == 0 )      /* do not auto-negotiate RxL */
            return;

      if( nl->cur_rxl_index == 0 )
            nl->delta_rxl = 1;
      else if( nl->cur_rxl_index == 15 )
            nl->delta_rxl = -1;
      else if( nl->cur_rxl_rcvd < nl->prev_rxl_rcvd )
            nl->delta_rxl = -nl->delta_rxl;

      nl->csr1.rxl = rxl_tab[ nl->cur_rxl_index += nl->delta_rxl ];
      inb( dev->base_addr + CSR0 ); /* needs for PCI cards */
      outb( *(u8 *)&nl->csr1, dev->base_addr + CSR1 );

      nl->prev_rxl_rcvd = nl->cur_rxl_rcvd;
      nl->cur_rxl_rcvd  = 0;
}


static void
timeout_change_level( struct net_device  *dev )
{
      struct net_local  *nl = (struct net_local *) dev->priv;

      nl->cur_rxl_index = timeout_rxl_tab[ nl->timeout_rxl ];
      if( ++nl->timeout_rxl >= 4 )
            nl->timeout_rxl = 0;

      nl->csr1.rxl = rxl_tab[ nl->cur_rxl_index ];
      inb( dev->base_addr + CSR0 );
      outb( *(unsigned char *)&nl->csr1, dev->base_addr + CSR1 );

      nl->prev_rxl_rcvd = nl->cur_rxl_rcvd;
      nl->cur_rxl_rcvd  = 0;
}

/* -------------------------------------------------------------------------- */

/*
 *    Open/initialize the board. 
 */

static int
sbni_open( struct net_device  *dev )
{
      struct net_local  *nl = (struct net_local *) dev->priv;
      struct timer_list *w  = &nl->watchdog;

      /*
       * For double ISA adapters within "common irq" mode, we have to
       * determine whether primary or secondary channel is initialized,
       * and set the irq handler only in first case.
       */
      if( dev->base_addr < 0x400 ) {            /* ISA only */
            struct net_device  **p = sbni_cards;
            for( ;  *p  &&  p < sbni_cards + SBNI_MAX_NUM_CARDS;  ++p )
                  if( (*p)->irq == dev->irq
                      &&  ((*p)->base_addr == dev->base_addr + 4
                         ||  (*p)->base_addr == dev->base_addr - 4)
                      &&  (*p)->flags & IFF_UP ) {

                        ((struct net_local *) ((*p)->priv))
                              ->second = dev;
                        printk( KERN_NOTICE "%s: using shared irq "
                              "with %s\n", dev->name, (*p)->name );
                        nl->state |= FL_SECONDARY;
                        goto  handler_attached;
                  }
      }

      if( request_irq(dev->irq, sbni_interrupt, IRQF_SHARED, dev->name, dev) ) {
            printk( KERN_ERR "%s: unable to get IRQ %d.\n",
                  dev->name, dev->irq );
            return  -EAGAIN;
      }

handler_attached:

      spin_lock( &nl->lock );
      memset( &nl->stats, 0, sizeof(struct net_device_stats) );
      memset( &nl->in_stats, 0, sizeof(struct sbni_in_stats) );

      card_start( dev );

      netif_start_queue( dev );

      /* set timer watchdog */
      init_timer( w );
      w->expires  = jiffies + SBNI_TIMEOUT;
      w->data           = (unsigned long) dev;
      w->function = sbni_watchdog;
      add_timer( w );
   
      spin_unlock( &nl->lock );
      return 0;
}


static int
sbni_close( struct net_device  *dev )
{
      struct net_local  *nl = (struct net_local *) dev->priv;

      if( nl->second  &&  nl->second->flags & IFF_UP ) {
            printk( KERN_NOTICE "Secondary channel (%s) is active!\n",
                  nl->second->name );
            return  -EBUSY;
      }

#ifdef CONFIG_SBNI_MULTILINE
      if( nl->state & FL_SLAVE )
            emancipate( dev );
      else
            while( nl->link ) /* it's master device! */
                  emancipate( nl->link );
#endif

      spin_lock( &nl->lock );

      nl->second = NULL;
      drop_xmit_queue( dev ); 
      netif_stop_queue( dev );
   
      del_timer( &nl->watchdog );

      outb( 0, dev->base_addr + CSR0 );

      if( !(nl->state & FL_SECONDARY) )
            free_irq( dev->irq, dev );
      nl->state &= FL_SECONDARY;

      spin_unlock( &nl->lock );
      return 0;
}


/*
      Valid combinations in CSR0 (for probing):

      VALID_DECODER     0000,0011,1011,1010

                              ; 0   ; -
                        TR_REQ      ; 1   ; +
                  TR_RDY            ; 2   ; -
                  TR_RDY      TR_REQ      ; 3   ; +
            BU_EMP                  ; 4   ; +
            BU_EMP            TR_REQ      ; 5   ; +
            BU_EMP      TR_RDY            ; 6   ; -
            BU_EMP      TR_RDY      TR_REQ      ; 7   ; +
      RC_RDY                        ; 8   ; +
      RC_RDY                  TR_REQ      ; 9   ; +
      RC_RDY            TR_RDY            ; 10  ; -
      RC_RDY            TR_RDY      TR_REQ      ; 11  ; -
      RC_RDY      BU_EMP                  ; 12  ; -
      RC_RDY      BU_EMP            TR_REQ      ; 13  ; -
      RC_RDY      BU_EMP      TR_RDY            ; 14  ; -
      RC_RDY      BU_EMP      TR_RDY      TR_REQ      ; 15  ; -
*/

#define VALID_DECODER (2 + 8 + 0x10 + 0x20 + 0x80 + 0x100 + 0x200)


static int
sbni_card_probe( unsigned long  ioaddr )
{
      unsigned char  csr0;

      csr0 = inb( ioaddr + CSR0 );
      if( csr0 != 0xff  &&  csr0 != 0x00 ) {
            csr0 &= ~EN_INT;
            if( csr0 & BU_EMP )
                  csr0 |= EN_INT;
      
            if( VALID_DECODER & (1 << (csr0 >> 4)) )
                  return  0;
      }
   
      return  -ENODEV;
}

/* -------------------------------------------------------------------------- */

static int
sbni_ioctl( struct net_device  *dev,  struct ifreq  *ifr,  int  cmd )
{
      struct net_local  *nl = (struct net_local *) dev->priv; 
      struct sbni_flags  flags;
      int  error = 0;

#ifdef CONFIG_SBNI_MULTILINE
      struct net_device  *slave_dev;
      char  slave_name[ 8 ];
#endif
  
      switch( cmd ) {
      case  SIOCDEVGETINSTATS :
            if (copy_to_user( ifr->ifr_data, &nl->in_stats,
                              sizeof(struct sbni_in_stats) ))
                  error = -EFAULT;
            break;

      case  SIOCDEVRESINSTATS :
            if( current->euid != 0 )      /* root only */
                  return  -EPERM;
            memset( &nl->in_stats, 0, sizeof(struct sbni_in_stats) );
            break;

      case  SIOCDEVGHWSTATE :
            flags.mac_addr    = *(u32 *)(dev->dev_addr + 3);
            flags.rate  = nl->csr1.rate;
            flags.slow_mode   = (nl->state & FL_SLOW_MODE) != 0;
            flags.rxl   = nl->cur_rxl_index;
            flags.fixed_rxl   = nl->delta_rxl == 0;

            if (copy_to_user( ifr->ifr_data, &flags, sizeof flags ))
                  error = -EFAULT;
            break;

      case  SIOCDEVSHWSTATE :
            if( current->euid != 0 )      /* root only */
                  return  -EPERM;

            spin_lock( &nl->lock );
            flags = *(struct sbni_flags*) &ifr->ifr_ifru;
            if( flags.fixed_rxl )
                  nl->delta_rxl = 0,
                  nl->cur_rxl_index = flags.rxl;
            else
                  nl->delta_rxl = DEF_RXL_DELTA,
                  nl->cur_rxl_index = DEF_RXL;

            nl->csr1.rxl = rxl_tab[ nl->cur_rxl_index ];
            nl->csr1.rate = flags.rate;
            outb( *(u8 *)&nl->csr1 | PR_RES, dev->base_addr + CSR1 );
            spin_unlock( &nl->lock );
            break;

#ifdef CONFIG_SBNI_MULTILINE

      case  SIOCDEVENSLAVE :
            if( current->euid != 0 )      /* root only */
                  return  -EPERM;

            if (copy_from_user( slave_name, ifr->ifr_data, sizeof slave_name ))
                  return -EFAULT;
            slave_dev = dev_get_by_name(&init_net, slave_name );
            if( !slave_dev  ||  !(slave_dev->flags & IFF_UP) ) {
                  printk( KERN_ERR "%s: trying to enslave non-active "
                        "device %s\n", dev->name, slave_name );
                  return  -EPERM;
            }

            return  enslave( dev, slave_dev );

      case  SIOCDEVEMANSIPATE :
            if( current->euid != 0 )      /* root only */
                  return  -EPERM;

            return  emancipate( dev );

#endif      /* CONFIG_SBNI_MULTILINE */

      default :
            return  -EOPNOTSUPP;
      }

      return  error;
}


#ifdef CONFIG_SBNI_MULTILINE

static int
enslave( struct net_device  *dev,  struct net_device  *slave_dev )
{
      struct net_local  *nl  = (struct net_local *) dev->priv;
      struct net_local  *snl = (struct net_local *) slave_dev->priv;

      if( nl->state & FL_SLAVE )    /* This isn't master or free device */
            return  -EBUSY;

      if( snl->state & FL_SLAVE )   /* That was already enslaved */
            return  -EBUSY;

      spin_lock( &nl->lock );
      spin_lock( &snl->lock );

      /* append to list */
      snl->link = nl->link;
      nl->link  = slave_dev;
      snl->master = dev;
      snl->state |= FL_SLAVE;

      /* Summary statistics of MultiLine operation will be stored
         in master's counters */
      memset( &snl->stats, 0, sizeof(struct net_device_stats) );
      netif_stop_queue( slave_dev );
      netif_wake_queue( dev );      /* Now we are able to transmit */

      spin_unlock( &snl->lock );
      spin_unlock( &nl->lock );
      printk( KERN_NOTICE "%s: slave device (%s) attached.\n",
            dev->name, slave_dev->name );
      return  0;
}


static int
emancipate( struct net_device  *dev )
{
      struct net_local   *snl = (struct net_local *) dev->priv;
      struct net_device  *p   = snl->master;
      struct net_local   *nl  = (struct net_local *) p->priv;

      if( !(snl->state & FL_SLAVE) )
            return  -EINVAL;

      spin_lock( &nl->lock );
      spin_lock( &snl->lock );
      drop_xmit_queue( dev );

      /* exclude from list */
      for(;;) {   /* must be in list */
            struct net_local  *t = (struct net_local *) p->priv;
            if( t->link == dev ) {
                  t->link = snl->link;
                  break;
            }
            p = t->link;
      }

      snl->link = NULL;
      snl->master = dev;
      snl->state &= ~FL_SLAVE;

      netif_start_queue( dev );

      spin_unlock( &snl->lock );
      spin_unlock( &nl->lock );

      dev_put( dev );
      return  0;
}

#endif


static struct net_device_stats *
sbni_get_stats( struct net_device  *dev )
{
      return  &((struct net_local *) dev->priv)->stats;
}


static void
set_multicast_list( struct net_device  *dev )
{
      return;           /* sbni always operate in promiscuos mode */
}


#ifdef MODULE
module_param_array(io, int, NULL, 0);
module_param_array(irq, int, NULL, 0);
module_param_array(baud, int, NULL, 0);
module_param_array(rxl, int, NULL, 0);
module_param_array(mac, int, NULL, 0);
module_param(skip_pci_probe, bool, 0);

MODULE_LICENSE("GPL");


int __init init_module( void )
{
      struct net_device  *dev;
      int err;

      while( num < SBNI_MAX_NUM_CARDS ) {
            dev = alloc_netdev(sizeof(struct net_local), 
                           "sbni%d", sbni_devsetup);
            if( !dev)
                  break;

            sprintf( dev->name, "sbni%d", num );

            err = sbni_init(dev);
            if (err) {
                  free_netdev(dev);
                  break;
            }

            if( register_netdev( dev ) ) {
                  release_region( dev->base_addr, SBNI_IO_EXTENT );
                  free_netdev( dev );
                  break;
            }
      }

      return  *sbni_cards  ?  0  :  -ENODEV;
}

void
cleanup_module( void )
{
      struct net_device  *dev;
      int  num;

      for( num = 0;  num < SBNI_MAX_NUM_CARDS;  ++num )
            if( (dev = sbni_cards[ num ]) != NULL ) {
                  unregister_netdev( dev );
                  release_region( dev->base_addr, SBNI_IO_EXTENT );
                  free_netdev( dev );
            }
}

#else /* MODULE */

static int __init
sbni_setup( char  *p )
{
      int  n, parm;

      if( *p++ != '(' )
            goto  bad_param;

      for( n = 0, parm = 0;  *p  &&  n < 8; ) {
            (*dest[ parm ])[ n ] = simple_strtol( p, &p, 0 );
            if( !*p  ||  *p == ')' )
                  return 1;
            if( *p == ';' )
                  ++p, ++n, parm = 0;
            else if( *p++ != ',' )
                  break;
            else
                  if( ++parm >= 5 )
                        break;
      }
bad_param:
      printk( KERN_ERR "Error in sbni kernel parameter!\n" );
      return 0;
}

__setup( "sbni=", sbni_setup );

#endif      /* MODULE */

/* -------------------------------------------------------------------------- */

#ifdef ASM_CRC

static u32
calc_crc32( u32  crc,  u8  *p,  u32  len )
{
      register u32  _crc;
      _crc = crc;
      
      __asm__ __volatile__ (
            "xorl %%ebx, %%ebx\n"
            "movl %2, %%esi\n" 
            "movl %3, %%ecx\n" 
            "movl $crc32tab, %%edi\n"
            "shrl $2, %%ecx\n"
            "jz   1f\n"

            ".align 4\n"
      "0:\n"
            "movb %%al, %%bl\n"
            "movl (%%esi), %%edx\n"
            "shrl $8, %%eax\n"
            "xorb %%dl, %%bl\n"
            "shrl $8, %%edx\n"
            "xorl (%%edi,%%ebx,4), %%eax\n"

            "movb %%al, %%bl\n"
            "shrl $8, %%eax\n"
            "xorb %%dl, %%bl\n"
            "shrl $8, %%edx\n"
            "xorl (%%edi,%%ebx,4), %%eax\n"

            "movb %%al, %%bl\n"
            "shrl $8, %%eax\n"
            "xorb %%dl, %%bl\n"
            "movb %%dh, %%dl\n" 
            "xorl (%%edi,%%ebx,4), %%eax\n"

            "movb %%al, %%bl\n"
            "shrl $8, %%eax\n"
            "xorb %%dl, %%bl\n"
            "addl $4, %%esi\n"
            "xorl (%%edi,%%ebx,4), %%eax\n"

            "decl %%ecx\n"
            "jnz  0b\n"

      "1:\n"
            "movl %3, %%ecx\n"
            "andl $3, %%ecx\n"
            "jz   2f\n"

            "movb %%al, %%bl\n"
            "shrl $8, %%eax\n"
            "xorb (%%esi), %%bl\n"
            "xorl (%%edi,%%ebx,4), %%eax\n"

            "decl %%ecx\n"
            "jz   2f\n"

            "movb %%al, %%bl\n"
            "shrl $8, %%eax\n"
            "xorb 1(%%esi), %%bl\n"
            "xorl (%%edi,%%ebx,4), %%eax\n"

            "decl %%ecx\n"
            "jz   2f\n"

            "movb %%al, %%bl\n"
            "shrl $8, %%eax\n"
            "xorb 2(%%esi), %%bl\n"
            "xorl (%%edi,%%ebx,4), %%eax\n"
      "2:\n"
            : "=a" (_crc)
            : "0" (_crc), "g" (p), "g" (len)
            : "bx", "cx", "dx", "si", "di"
      );

      return  _crc;
}

#else /* ASM_CRC */

static u32
calc_crc32( u32  crc,  u8  *p,  u32  len )
{
      while( len-- )
            crc = CRC32( *p++, crc );

      return  crc;
}

#endif      /* ASM_CRC */


static u32  crc32tab[] __attribute__ ((aligned(8))) = {
      0xD202EF8D,  0xA505DF1B,  0x3C0C8EA1,  0x4B0BBE37,
      0xD56F2B94,  0xA2681B02,  0x3B614AB8,  0x4C667A2E,
      0xDCD967BF,  0xABDE5729,  0x32D70693,  0x45D03605,
      0xDBB4A3A6,  0xACB39330,  0x35BAC28A,  0x42BDF21C,
      0xCFB5FFE9,  0xB8B2CF7F,  0x21BB9EC5,  0x56BCAE53,
      0xC8D83BF0,  0xBFDF0B66,  0x26D65ADC,  0x51D16A4A,
      0xC16E77DB,  0xB669474D,  0x2F6016F7,  0x58672661,
      0xC603B3C2,  0xB1048354,  0x280DD2EE,  0x5F0AE278,
      0xE96CCF45,  0x9E6BFFD3,  0x0762AE69,  0x70659EFF,
      0xEE010B5C,  0x99063BCA,  0x000F6A70,  0x77085AE6,
      0xE7B74777,  0x90B077E1,  0x09B9265B,  0x7EBE16CD,
      0xE0DA836E,  0x97DDB3F8,  0x0ED4E242,  0x79D3D2D4,
      0xF4DBDF21,  0x83DCEFB7,  0x1AD5BE0D,  0x6DD28E9B,
      0xF3B61B38,  0x84B12BAE,  0x1DB87A14,  0x6ABF4A82,
      0xFA005713,  0x8D076785,  0x140E363F,  0x630906A9,
      0xFD6D930A,  0x8A6AA39C,  0x1363F226,  0x6464C2B0,
      0xA4DEAE1D,  0xD3D99E8B,  0x4AD0CF31,  0x3DD7FFA7,
      0xA3B36A04,  0xD4B45A92,  0x4DBD0B28,  0x3ABA3BBE,
      0xAA05262F,  0xDD0216B9,  0x440B4703,  0x330C7795,
      0xAD68E236,  0xDA6FD2A0,  0x4366831A,  0x3461B38C,
      0xB969BE79,  0xCE6E8EEF,  0x5767DF55,  0x2060EFC3,
      0xBE047A60,  0xC9034AF6,  0x500A1B4C,  0x270D2BDA,
      0xB7B2364B,  0xC0B506DD,  0x59BC5767,  0x2EBB67F1,
      0xB0DFF252,  0xC7D8C2C4,  0x5ED1937E,  0x29D6A3E8,
      0x9FB08ED5,  0xE8B7BE43,  0x71BEEFF9,  0x06B9DF6F,
      0x98DD4ACC,  0xEFDA7A5A,  0x76D32BE0,  0x01D41B76,
      0x916B06E7,  0xE66C3671,  0x7F6567CB,  0x0862575D,
      0x9606C2FE,  0xE101F268,  0x7808A3D2,  0x0F0F9344,
      0x82079EB1,  0xF500AE27,  0x6C09FF9D,  0x1B0ECF0B,
      0x856A5AA8,  0xF26D6A3E,  0x6B643B84,  0x1C630B12,
      0x8CDC1683,  0xFBDB2615,  0x62D277AF,  0x15D54739,
      0x8BB1D29A,  0xFCB6E20C,  0x65BFB3B6,  0x12B88320,
      0x3FBA6CAD,  0x48BD5C3B,  0xD1B40D81,  0xA6B33D17,
      0x38D7A8B4,  0x4FD09822,  0xD6D9C998,  0xA1DEF90E,
      0x3161E49F,  0x4666D409,  0xDF6F85B3,  0xA868B525,
      0x360C2086,  0x410B1010,  0xD80241AA,  0xAF05713C,
      0x220D7CC9,  0x550A4C5F,  0xCC031DE5,  0xBB042D73,
      0x2560B8D0,  0x52678846,  0xCB6ED9FC,  0xBC69E96A,
      0x2CD6F4FB,  0x5BD1C46D,  0xC2D895D7,  0xB5DFA541,
      0x2BBB30E2,  0x5CBC0074,  0xC5B551CE,  0xB2B26158,
      0x04D44C65,  0x73D37CF3,  0xEADA2D49,  0x9DDD1DDF,
      0x03B9887C,  0x74BEB8EA,  0xEDB7E950,  0x9AB0D9C6,
      0x0A0FC457,  0x7D08F4C1,  0xE401A57B,  0x930695ED,
      0x0D62004E,  0x7A6530D8,  0xE36C6162,  0x946B51F4,
      0x19635C01,  0x6E646C97,  0xF76D3D2D,  0x806A0DBB,
      0x1E0E9818,  0x6909A88E,  0xF000F934,  0x8707C9A2,
      0x17B8D433,  0x60BFE4A5,  0xF9B6B51F,  0x8EB18589,
      0x10D5102A,  0x67D220BC,  0xFEDB7106,  0x89DC4190,
      0x49662D3D,  0x3E611DAB,  0xA7684C11,  0xD06F7C87,
      0x4E0BE924,  0x390CD9B2,  0xA0058808,  0xD702B89E,
      0x47BDA50F,  0x30BA9599,  0xA9B3C423,  0xDEB4F4B5,
      0x40D06116,  0x37D75180,  0xAEDE003A,  0xD9D930AC,
      0x54D13D59,  0x23D60DCF,  0xBADF5C75,  0xCDD86CE3,
      0x53BCF940,  0x24BBC9D6,  0xBDB2986C,  0xCAB5A8FA,
      0x5A0AB56B,  0x2D0D85FD,  0xB404D447,  0xC303E4D1,
      0x5D677172,  0x2A6041E4,  0xB369105E,  0xC46E20C8,
      0x72080DF5,  0x050F3D63,  0x9C066CD9,  0xEB015C4F,
      0x7565C9EC,  0x0262F97A,  0x9B6BA8C0,  0xEC6C9856,
      0x7CD385C7,  0x0BD4B551,  0x92DDE4EB,  0xE5DAD47D,
      0x7BBE41DE,  0x0CB97148,  0x95B020F2,  0xE2B71064,
      0x6FBF1D91,  0x18B82D07,  0x81B17CBD,  0xF6B64C2B,
      0x68D2D988,  0x1FD5E91E,  0x86DCB8A4,  0xF1DB8832,
      0x616495A3,  0x1663A535,  0x8F6AF48F,  0xF86DC419,
      0x660951BA,  0x110E612C,  0x88073096,  0xFF000000
};


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