Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1735 insertions, 0 deletions

diff --git a/drivers/net/wan/sbni.c b/drivers/net/wan/sbni.c
new file mode 100644
index 00000000000..db2c798ba89
--- /dev/null
+++ b/drivers/net/wan/sbni.c
@@ -0,0 +1,1735 @@
+/* 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/config.h>
+#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/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 *, struct pt_regs * );
+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;
+
+	SET_MODULE_OWNER( dev );
+}
+
+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 pt_regs  *regs )
+{
+	struct net_device	  *dev = (struct net_device *) dev_id;
+	struct net_local  *nl  = (struct net_local *) 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, frameno, ack;
+	unsigned  is_first, frame_ok;
+
+	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 );
+	} else
+		frame_ok = 0;
+
+	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;
+
+#ifdef CONFIG_SBNI_MULTILINE
+	skb->dev = ((struct net_local *) dev->priv)->master;
+#else
+	skb->dev = dev;
+#endif
+	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 );
+
+	n