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sbni.c
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/* sbni.c: Granch SBNI12 leased line adapters driver for linux
*
* Written 2001 by Denis I.Timofeev ([email protected])
*
* 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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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/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 <net/Space.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 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 netdev_tx_t sbni_start_xmit(struct sk_buff *,
struct net_device * );
static int sbni_ioctl( struct net_device *, struct ifreq *, int );
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
static const char version[] =
"Granch SBNI12 driver ver 5.0.1 Jun 22 2001 Denis I.Timofeev.\n";
static bool skip_pci_probe __initdata = false;
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 *dest[5] __initdata = { &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 };
#define NET_LOCAL_LOCK(dev) (((struct net_local *)netdev_priv(dev))->lock)
/*
* 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 {
pr_err("base address 0x%lx is busy, or adapter is malfunctional!\n",
dev->base_addr);
return -ENODEV;
}
}
static const struct net_device_ops sbni_netdev_ops = {
.ndo_open = sbni_open,
.ndo_stop = sbni_close,
.ndo_start_xmit = sbni_start_xmit,
.ndo_set_rx_mode = set_multicast_list,
.ndo_do_ioctl = sbni_ioctl,
.ndo_change_mtu = eth_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
};
static void __init sbni_devsetup(struct net_device *dev)
{
ether_setup( dev );
dev->netdev_ops = &sbni_netdev_ops;
}
int __init sbni_probe(int unit)
{
struct net_device *dev;
int err;
dev = alloc_netdev(sizeof(struct net_local), "sbni", sbni_devsetup);
if (!dev)
return -ENOMEM;
dev->netdev_ops = &sbni_netdev_ops;
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;
}
pr_info_once("%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;
}
static 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;
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 ) ) {
if (pdev->subsystem_device != 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)
pr_warn(
"WARNING: The PCI BIOS assigned this PCI card to IRQ %d, which is unlikely to work!.\n"
"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 ) {
pr_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;
/* Fill in sbni-specific dev fields. */
nl = netdev_priv(dev);
if( !nl ) {
pr_err("%s: unable to get memory!\n", dev->name);
release_region( ioaddr, SBNI_IO_EXTENT );
return NULL;
}
memset( nl, 0, sizeof(struct net_local) );
spin_lock_init( &nl->lock );
/* store MAC address (generate if that isn't known) */
*(__be16 *)dev->dev_addr = htons( 0x00ff );
*(__be32 *)(dev->dev_addr + 2) = htonl( 0x01000000 |
((mac[num] ?
mac[num] :
(u32)((long)netdev_priv(dev))) & 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;
pr_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]);
pr_notice("%s: speed %d",
dev->name,
((nl->state & FL_SLOW_MODE) ? 500000 : 2000000)
/ (1 << nl->csr1.rate));
if( nl->delta_rxl == 0 )
pr_cont(", receive level 0x%x (fixed)\n", nl->cur_rxl_index);
else
pr_cont(", receive level (auto)\n");
#ifdef CONFIG_SBNI_MULTILINE
nl->master = dev;
nl->link = NULL;
#endif
sbni_cards[ num++ ] = dev;
return dev;
}
/* -------------------------------------------------------------------------- */
#ifdef CONFIG_SBNI_MULTILINE
static netdev_tx_t
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 = netdev_priv(p);
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 NETDEV_TX_OK;
}
}
return NETDEV_TX_BUSY;
}
#else /* CONFIG_SBNI_MULTILINE */
static netdev_tx_t
sbni_start_xmit( struct sk_buff *skb, struct net_device *dev )
{
struct net_local *nl = netdev_priv(dev);
netif_stop_queue( dev );
spin_lock( &nl->lock );
prepare_to_send( skb, dev );
spin_unlock( &nl->lock );
return NETDEV_TX_OK;
}
#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 = netdev_priv(dev);
int repeat;
spin_lock( &nl->lock );
if( nl->second )
spin_lock(&NET_LOCAL_LOCK(nl->second));
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(&NET_LOCAL_LOCK(nl->second));
spin_unlock( &nl->lock );
return IRQ_HANDLED;
}
static void
handle_channel( struct net_device *dev )
{
struct net_local *nl = netdev_priv(dev);
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(&NET_LOCAL_LOCK(nl->master));
#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) )
netdev_err(dev, "internal error!\n");
/* 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(&NET_LOCAL_LOCK(nl->master));
#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 = netdev_priv(dev);
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 = netdev_priv(dev);
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 = netdev_priv(dev);
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 = netdev_priv(dev);
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
nl->master->stats.rx_errors++,
nl->master->stats.rx_missed_errors++;
#else
dev->stats.rx_errors++,
dev->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
nl->master->stats.rx_errors++,
nl->master->stats.rx_crc_errors++;
#else
dev->stats.rx_errors++,
dev->stats.rx_crc_errors++;
#endif
return frame_ok;
}
static inline void
send_complete( struct net_device *dev )
{
struct net_local *nl = netdev_priv(dev);
#ifdef CONFIG_SBNI_MULTILINE
nl->master->stats.tx_packets++;
nl->master->stats.tx_bytes += nl->tx_buf_p->len;
#else
dev->stats.tx_packets++;
dev->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 = netdev_priv(dev);
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( dev ),
#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 = netdev_priv(dev);
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 = netdev_priv(dev);
unsigned int len;
/* nl->tx_buf_p == NULL here! */
if( nl->tx_buf_p )
netdev_err(dev, "memory leak!\n");
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 = DIV_ROUND_UP(len, 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 = netdev_priv(dev);
if( nl->tx_buf_p )
dev_kfree_skb_any( nl->tx_buf_p ),
nl->tx_buf_p = NULL,
#ifdef CONFIG_SBNI_MULTILINE
nl->master->stats.tx_errors++,
nl->master->stats.tx_carrier_errors++;
#else
dev->stats.tx_errors++,
dev->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 = netdev_priv(dev);
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;
}