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linux/drivers/net/arm/ether3.c
Herbert Xu 5b057c6b1a [NET]: Avoid allocating skb in skb_pad 
First of all it is unnecessary to allocate a new skb in skb_pad since
the existing one is not shared.  More importantly, our hard_start_xmit
interface does not allow a new skb to be allocated since that breaks
requeueing.

This patch uses pskb_expand_head to expand the existing skb and linearize
it if needed.  Actually, someone should sift through every instance of
skb_pad on a non-linear skb as they do not fit the reasons why this was
originally created.

Incidentally, this fixes a minor bug when the skb is cloned (tcpdump,
TCP, etc.).  As it is skb_pad will simply write over a cloned skb.  Because
of the position of the write it is unlikely to cause problems but still
it's best if we don't do it.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-06-23 02:06:41 -07:00

935 lines
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/*
* linux/drivers/acorn/net/ether3.c
*
* Copyright (C) 1995-2000 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* SEEQ nq8005 ethernet driver for Acorn/ANT Ether3 card
* for Acorn machines
*
* By Russell King, with some suggestions from borris@ant.co.uk
*
* Changelog:
* 1.04 RMK 29/02/1996 Won't pass packets that are from our ethernet
* address up to the higher levels - they're
* silently ignored. I/F can now be put into
* multicast mode. Receiver routine optimised.
* 1.05 RMK 30/02/1996 Now claims interrupt at open when part of
* the kernel rather than when a module.
* 1.06 RMK 02/03/1996 Various code cleanups
* 1.07 RMK 13/10/1996 Optimised interrupt routine and transmit
* routines.
* 1.08 RMK 14/10/1996 Fixed problem with too many packets,
* prevented the kernel message about dropped
* packets appearing too many times a second.
* Now does not disable all IRQs, only the IRQ
* used by this card.
* 1.09 RMK 10/11/1996 Only enables TX irq when buffer space is low,
* but we still service the TX queue if we get a
* RX interrupt.
* 1.10 RMK 15/07/1997 Fixed autoprobing of NQ8004.
* 1.11 RMK 16/11/1997 Fixed autoprobing of NQ8005A.
* 1.12 RMK 31/12/1997 Removed reference to dev_tint for Linux 2.1.
* RMK 27/06/1998 Changed asm/delay.h to linux/delay.h.
* 1.13 RMK 29/06/1998 Fixed problem with transmission of packets.
* Chip seems to have a bug in, whereby if the
* packet starts two bytes from the end of the
* buffer, it corrupts the receiver chain, and
* never updates the transmit status correctly.
* 1.14 RMK 07/01/1998 Added initial code for ETHERB addressing.
* 1.15 RMK 30/04/1999 More fixes to the transmit routine for buggy
* hardware.
* 1.16 RMK 10/02/2000 Updated for 2.3.43
* 1.17 RMK 13/05/2000 Updated for 2.3.99-pre8
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/ecard.h>
#include <asm/io.h>
static char version[] __initdata = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
#include "ether3.h"
static unsigned int net_debug = NET_DEBUG;
static void ether3_setmulticastlist(struct net_device *dev);
static int ether3_rx(struct net_device *dev, unsigned int maxcnt);
static void ether3_tx(struct net_device *dev);
static int ether3_open (struct net_device *dev);
static int ether3_sendpacket (struct sk_buff *skb, struct net_device *dev);
static irqreturn_t ether3_interrupt (int irq, void *dev_id, struct pt_regs *regs);
static int ether3_close (struct net_device *dev);
static struct net_device_stats *ether3_getstats (struct net_device *dev);
static void ether3_setmulticastlist (struct net_device *dev);
static void ether3_timeout(struct net_device *dev);
#define BUS_16 2
#define BUS_8 1
#define BUS_UNKNOWN 0
/* --------------------------------------------------------------------------- */
typedef enum {
buffer_write,
buffer_read
} buffer_rw_t;
/*
* ether3 read/write. Slow things down a bit...
* The SEEQ8005 doesn't like us writing to its registers
* too quickly.
*/
static inline void ether3_outb(int v, const void __iomem *r)
{
writeb(v, r);
udelay(1);
}
static inline void ether3_outw(int v, const void __iomem *r)
{
writew(v, r);
udelay(1);
}
#define ether3_inb(r) ({ unsigned int __v = readb((r)); udelay(1); __v; })
#define ether3_inw(r) ({ unsigned int __v = readw((r)); udelay(1); __v; })
static int
ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
{
int timeout = 1000;
ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
if (!timeout--) {
printk("%s: setbuffer broken\n", dev->name);
priv(dev)->broken = 1;
return 1;
}
udelay(1);
}
if (read == buffer_read) {
ether3_outw(start, REG_DMAADDR);
ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
} else {
ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
ether3_outw(start, REG_DMAADDR);
}
return 0;
}
/*
* write data to the buffer memory
*/
#define ether3_writebuffer(dev,data,length) \
writesw(REG_BUFWIN, (data), (length) >> 1)
#define ether3_writeword(dev,data) \
writew((data), REG_BUFWIN)
#define ether3_writelong(dev,data) { \
void __iomem *reg_bufwin = REG_BUFWIN; \
writew((data), reg_bufwin); \
writew((data) >> 16, reg_bufwin); \
}
/*
* read data from the buffer memory
*/
#define ether3_readbuffer(dev,data,length) \
readsw(REG_BUFWIN, (data), (length) >> 1)
#define ether3_readword(dev) \
readw(REG_BUFWIN)
#define ether3_readlong(dev) \
readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
/*
* Switch LED off...
*/
static void ether3_ledoff(unsigned long data)
{
struct net_device *dev = (struct net_device *)data;
ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
}
/*
* switch LED on...
*/
static inline void ether3_ledon(struct net_device *dev)
{
del_timer(&priv(dev)->timer);
priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
priv(dev)->timer.data = (unsigned long)dev;
priv(dev)->timer.function = ether3_ledoff;
add_timer(&priv(dev)->timer);
if (priv(dev)->regs.config2 & CFG2_CTRLO)
ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
}
/*
* Read the ethernet address string from the on board rom.
* This is an ascii string!!!
*/
static int __init
ether3_addr(char *addr, struct expansion_card *ec)
{
struct in_chunk_dir cd;
char *s;
if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
int i;
for (i = 0; i<6; i++) {
addr[i] = simple_strtoul(s + 1, &s, 0x10);
if (*s != (i==5?')' : ':' ))
break;
}
if (i == 6)
return 0;
}
/* I wonder if we should even let the user continue in this case
* - no, it would be better to disable the device
*/
printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
return -ENODEV;
}
/* --------------------------------------------------------------------------- */
static int __init
ether3_ramtest(struct net_device *dev, unsigned char byte)
{
unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
int i,ret = 0;
int max_errors = 4;
int bad = -1;
if (!buffer)
return 1;
memset(buffer, byte, RX_END);
ether3_setbuffer(dev, buffer_write, 0);
ether3_writebuffer(dev, buffer, TX_END);
ether3_setbuffer(dev, buffer_write, RX_START);
ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
memset(buffer, byte ^ 0xff, RX_END);
ether3_setbuffer(dev, buffer_read, 0);
ether3_readbuffer(dev, buffer, TX_END);
ether3_setbuffer(dev, buffer_read, RX_START);
ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
for (i = 0; i < RX_END; i++) {
if (buffer[i] != byte) {
if (max_errors > 0 && bad != buffer[i]) {
printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
dev->name, buffer[i], byte, i);
ret = 2;
max_errors--;
bad = i;
}
} else {
if (bad != -1) {
if (bad != i - 1)
printk(" - 0x%04X\n", i - 1);
printk("\n");
bad = -1;
}
}
}
if (bad != -1)
printk(" - 0xffff\n");
kfree(buffer);
return ret;
}
/* ------------------------------------------------------------------------------- */
static int __init ether3_init_2(struct net_device *dev)
{
int i;
priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
priv(dev)->regs.command = 0;
/*
* Set up our hardware address
*/
ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
for (i = 0; i < 6; i++)
ether3_outb(dev->dev_addr[i], REG_BUFWIN);
if (dev->flags & IFF_PROMISC)
priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
else if (dev->flags & IFF_MULTICAST)
priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
else
priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
/*
* There is a problem with the NQ8005 in that it occasionally loses the
* last two bytes. To get round this problem, we receive the CRC as
* well. That way, if we do lose the last two, then it doesn't matter.
*/
ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
ether3_outw(0, REG_TRANSMITPTR);
ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
ether3_outw(priv(dev)->regs.command, REG_COMMAND);
i = ether3_ramtest(dev, 0x5A);
if(i)
return i;
i = ether3_ramtest(dev, 0x1E);
if(i)
return i;
ether3_setbuffer(dev, buffer_write, 0);
ether3_writelong(dev, 0);
return 0;
}
static void
ether3_init_for_open(struct net_device *dev)
{
int i;
memset(&priv(dev)->stats, 0, sizeof(struct net_device_stats));
/* Reset the chip */
ether3_outw(CFG2_RESET, REG_CONFIG2);
udelay(4);
priv(dev)->regs.command = 0;
ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
barrier();
ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
for (i = 0; i < 6; i++)
ether3_outb(dev->dev_addr[i], REG_BUFWIN);
priv(dev)->tx_head = 0;
priv(dev)->tx_tail = 0;
priv(dev)->regs.config2 |= CFG2_CTRLO;
priv(dev)->rx_head = RX_START;
ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
ether3_outw(0, REG_TRANSMITPTR);
ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
ether3_setbuffer(dev, buffer_write, 0);
ether3_writelong(dev, 0);
priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
}
static inline int
ether3_probe_bus_8(struct net_device *dev, int val)
{
int write_low, write_high, read_low, read_high;
write_low = val & 255;
write_high = val >> 8;
printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
ether3_outb(write_low, REG_RECVPTR);
ether3_outb(write_high, REG_RECVPTR + 4);
read_low = ether3_inb(REG_RECVPTR);
read_high = ether3_inb(REG_RECVPTR + 4);
printk(", read8 [%02X:%02X]\n", read_high, read_low);
return read_low == write_low && read_high == write_high;
}
static inline int
ether3_probe_bus_16(struct net_device *dev, int val)
{
int read_val;
ether3_outw(val, REG_RECVPTR);
read_val = ether3_inw(REG_RECVPTR);
printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
return read_val == val;
}
/*
* Open/initialize the board. This is called (in the current kernel)
* sometime after booting when the 'ifconfig' program is run.
*
* This routine should set everything up anew at each open, even
* registers that "should" only need to be set once at boot, so that
* there is non-reboot way to recover if something goes wrong.
*/
static int
ether3_open(struct net_device *dev)
{
if (!is_valid_ether_addr(dev->dev_addr)) {
printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
dev->name);
return -EINVAL;
}
if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
return -EAGAIN;
ether3_init_for_open(dev);
netif_start_queue(dev);
return 0;
}
/*
* The inverse routine to ether3_open().
*/
static int
ether3_close(struct net_device *dev)
{
netif_stop_queue(dev);
disable_irq(dev->irq);
ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
priv(dev)->regs.command = 0;
while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
barrier();
ether3_outb(0x80, REG_CONFIG2 + 4);
ether3_outw(0, REG_COMMAND);
free_irq(dev->irq, dev);
return 0;
}
/*
* Get the current statistics. This may be called with the card open or
* closed.
*/
static struct net_device_stats *ether3_getstats(struct net_device *dev)
{
return &priv(dev)->stats;
}
/*
* Set or clear promiscuous/multicast mode filter for this adaptor.
*
* We don't attempt any packet filtering. The card may have a SEEQ 8004
* in which does not have the other ethernet address registers present...
*/
static void ether3_setmulticastlist(struct net_device *dev)
{
priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
if (dev->flags & IFF_PROMISC) {
/* promiscuous mode */
priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
} else if (dev->flags & IFF_ALLMULTI) {
priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
} else
priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
}
static void ether3_timeout(struct net_device *dev)
{
unsigned long flags;
del_timer(&priv(dev)->timer);
local_irq_save(flags);
printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
priv(dev)->tx_head, priv(dev)->tx_tail);
ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
local_irq_restore(flags);
priv(dev)->regs.config2 |= CFG2_CTRLO;
priv(dev)->stats.tx_errors += 1;
ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
priv(dev)->tx_head = priv(dev)->tx_tail = 0;
netif_wake_queue(dev);
}
/*
* Transmit a packet
*/
static int
ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
{
unsigned long flags;
unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
unsigned int ptr, next_ptr;
if (priv(dev)->broken) {
dev_kfree_skb(skb);
priv(dev)->stats.tx_dropped ++;
netif_start_queue(dev);
return 0;
}
length = (length + 1) & ~1;
if (length != skb->len) {
if (skb_padto(skb, length))
goto out;
}
next_ptr = (priv(dev)->tx_head + 1) & 15;
local_irq_save(flags);
if (priv(dev)->tx_tail == next_ptr) {
local_irq_restore(flags);
return 1; /* unable to queue */
}
dev->trans_start = jiffies;
ptr = 0x600 * priv(dev)->tx_head;
priv(dev)->tx_head = next_ptr;
next_ptr *= 0x600;
#define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
ether3_setbuffer(dev, buffer_write, next_ptr);
ether3_writelong(dev, 0);
ether3_setbuffer(dev, buffer_write, ptr);
ether3_writelong(dev, 0);
ether3_writebuffer(dev, skb->data, length);
ether3_writeword(dev, htons(next_ptr));
ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
ether3_setbuffer(dev, buffer_write, ptr);
ether3_writeword(dev, htons((ptr + length + 4)));
ether3_writeword(dev, TXHDR_FLAGS >> 16);
ether3_ledon(dev);
if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
ether3_outw(ptr, REG_TRANSMITPTR);
ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
}
next_ptr = (priv(dev)->tx_head + 1) & 15;
local_irq_restore(flags);
dev_kfree_skb(skb);
if (priv(dev)->tx_tail == next_ptr)
netif_stop_queue(dev);
out:
return 0;
}
static irqreturn_t
ether3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
struct net_device *dev = (struct net_device *)dev_id;
unsigned int status, handled = IRQ_NONE;
#if NET_DEBUG > 1
if(net_debug & DEBUG_INT)
printk("eth3irq: %d ", irq);
#endif
status = ether3_inw(REG_STATUS);
if (status & STAT_INTRX) {
ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
ether3_rx(dev, 12);
handled = IRQ_HANDLED;
}
if (status & STAT_INTTX) {
ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
ether3_tx(dev);
handled = IRQ_HANDLED;
}
#if NET_DEBUG > 1
if(net_debug & DEBUG_INT)
printk("done\n");
#endif
return handled;
}
/*
* If we have a good packet(s), get it/them out of the buffers.
*/
static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
{
unsigned int next_ptr = priv(dev)->rx_head, received = 0;
ether3_ledon(dev);
do {
unsigned int this_ptr, status;
unsigned char addrs[16];
/*
* read the first 16 bytes from the buffer.
* This contains the status bytes etc and ethernet addresses,
* and we also check the source ethernet address to see if
* it originated from us.
*/
{
unsigned int temp_ptr;
ether3_setbuffer(dev, buffer_read, next_ptr);
temp_ptr = ether3_readword(dev);
status = ether3_readword(dev);
if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
(RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
break;
this_ptr = next_ptr + 4;
next_ptr = ntohs(temp_ptr);
}
ether3_setbuffer(dev, buffer_read, this_ptr);
ether3_readbuffer(dev, addrs+2, 12);
if (next_ptr < RX_START || next_ptr >= RX_END) {
int i;
printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
for (i = 2; i < 14; i++)
printk("%02X ", addrs[i]);
printk("\n");
next_ptr = priv(dev)->rx_head;
break;
}
/*
* ignore our own packets...
*/
if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
!(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
maxcnt ++; /* compensate for loopedback packet */
ether3_outw(next_ptr >> 8, REG_RECVEND);
} else
if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
unsigned int length = next_ptr - this_ptr;
struct sk_buff *skb;
if (next_ptr <= this_ptr)
length += RX_END - RX_START;
skb = dev_alloc_skb(length + 2);
if (skb) {
unsigned char *buf;
skb->dev = dev;
skb_reserve(skb, 2);
buf = skb_put(skb, length);
ether3_readbuffer(dev, buf + 12, length - 12);
ether3_outw(next_ptr >> 8, REG_RECVEND);
*(unsigned short *)(buf + 0) = *(unsigned short *)(addrs + 2);
*(unsigned long *)(buf + 2) = *(unsigned long *)(addrs + 4);
*(unsigned long *)(buf + 6) = *(unsigned long *)(addrs + 8);
*(unsigned short *)(buf + 10) = *(unsigned short *)(addrs + 12);
skb->protocol = eth_type_trans(skb, dev);
netif_rx(skb);
received ++;
} else
goto dropping;
} else {
struct net_device_stats *stats = &priv(dev)->stats;
ether3_outw(next_ptr >> 8, REG_RECVEND);
if (status & RXSTAT_OVERSIZE) stats->rx_over_errors ++;
if (status & RXSTAT_CRCERROR) stats->rx_crc_errors ++;
if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
if (status & RXSTAT_SHORTPACKET) stats->rx_length_errors ++;
stats->rx_errors++;
}
}
while (-- maxcnt);
done:
priv(dev)->stats.rx_packets += received;
priv(dev)->rx_head = next_ptr;
/*
* If rx went off line, then that means that the buffer may be full. We
* have dropped at least one packet.
*/
if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
priv(dev)->stats.rx_dropped ++;
ether3_outw(next_ptr, REG_RECVPTR);
ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
}
return maxcnt;
dropping:{
static unsigned long last_warned;
ether3_outw(next_ptr >> 8, REG_RECVEND);
/*
* Don't print this message too many times...
*/
if (time_after(jiffies, last_warned + 10 * HZ)) {
last_warned = jiffies;
printk("%s: memory squeeze, dropping packet.\n", dev->name);
}
priv(dev)->stats.rx_dropped ++;
goto done;
}
}
/*
* Update stats for the transmitted packet(s)
*/
static void ether3_tx(struct net_device *dev)
{
unsigned int tx_tail = priv(dev)->tx_tail;
int max_work = 14;
do {
unsigned long status;
/*
* Read the packet header
*/
ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
status = ether3_readlong(dev);
/*
* Check to see if this packet has been transmitted
*/
if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
(TXSTAT_DONE | TXHDR_TRANSMIT))
break;
/*
* Update errors
*/
if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
priv(dev)->stats.tx_packets++;
else {
priv(dev)->stats.tx_errors ++;
if (status & TXSTAT_16COLLISIONS)
priv(dev)->stats.collisions += 16;
if (status & TXSTAT_BABBLED)
priv(dev)->stats.tx_fifo_errors ++;
}
tx_tail = (tx_tail + 1) & 15;
} while (--max_work);
if (priv(dev)->tx_tail != tx_tail) {
priv(dev)->tx_tail = tx_tail;
netif_wake_queue(dev);
}
}
static void __init ether3_banner(void)
{
static unsigned version_printed = 0;
if (net_debug && version_printed++ == 0)
printk(KERN_INFO "%s", version);
}
static int __devinit
ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
{
const struct ether3_data *data = id->data;
struct net_device *dev;
int i, bus_type, ret;
ether3_banner();
ret = ecard_request_resources(ec);
if (ret)
goto out;
dev = alloc_etherdev(sizeof(struct dev_priv));
if (!dev) {
ret = -ENOMEM;
goto release;
}
SET_MODULE_OWNER(dev);
SET_NETDEV_DEV(dev, &ec->dev);
priv(dev)->base = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
ecard_resource_len(ec, ECARD_RES_MEMC));
if (!priv(dev)->base) {
ret = -ENOMEM;
goto free;
}
ec->irqaddr = priv(dev)->base + data->base_offset;
ec->irqmask = 0xf0;
priv(dev)->seeq = priv(dev)->base + data->base_offset;
dev->irq = ec->irq;
ether3_addr(dev->dev_addr, ec);
init_timer(&priv(dev)->timer);
/* Reset card...
*/
ether3_outb(0x80, REG_CONFIG2 + 4);
bus_type = BUS_UNKNOWN;
udelay(4);
/* Test using Receive Pointer (16-bit register) to find out
* how the ether3 is connected to the bus...
*/
if (ether3_probe_bus_8(dev, 0x100) &&
ether3_probe_bus_8(dev, 0x201))
bus_type = BUS_8;
if (bus_type == BUS_UNKNOWN &&
ether3_probe_bus_16(dev, 0x101) &&
ether3_probe_bus_16(dev, 0x201))
bus_type = BUS_16;
switch (bus_type) {
case BUS_UNKNOWN:
printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
ret = -ENODEV;
goto free;
case BUS_8:
printk(KERN_ERR "%s: %s found, but is an unsupported "
"8-bit card\n", dev->name, data->name);
ret = -ENODEV;
goto free;
default:
break;
}
if (ether3_init_2(dev)) {
ret = -ENODEV;
goto free;
}
dev->open = ether3_open;
dev->stop = ether3_close;
dev->hard_start_xmit = ether3_sendpacket;
dev->get_stats = ether3_getstats;
dev->set_multicast_list = ether3_setmulticastlist;
dev->tx_timeout = ether3_timeout;
dev->watchdog_timeo = 5 * HZ / 100;
ret = register_netdev(dev);
if (ret)
goto free;
printk("%s: %s in slot %d, ", dev->name, data->name, ec->slot_no);
for (i = 0; i < 6; i++)
printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
ecard_set_drvdata(ec, dev);
return 0;
free:
if (priv(dev)->base)
iounmap(priv(dev)->base);
free_netdev(dev);
release:
ecard_release_resources(ec);
out:
return ret;
}
static void __devexit ether3_remove(struct expansion_card *ec)
{
struct net_device *dev = ecard_get_drvdata(ec);
ecard_set_drvdata(ec, NULL);
unregister_netdev(dev);
iounmap(priv(dev)->base);
free_netdev(dev);
ecard_release_resources(ec);
}
static struct ether3_data ether3 = {
.name = "ether3",
.base_offset = 0,
};
static struct ether3_data etherb = {
.name = "etherb",
.base_offset = 0x800,
};
static const struct ecard_id ether3_ids[] = {
{ MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
{ MANU_ANT, PROD_ANT_ETHER3, &ether3 },
{ MANU_ANT, PROD_ANT_ETHERB, &etherb },
{ 0xffff, 0xffff }
};
static struct ecard_driver ether3_driver = {
.probe = ether3_probe,
.remove = __devexit_p(ether3_remove),
.id_table = ether3_ids,
.drv = {
.name = "ether3",
},
};
static int __init ether3_init(void)
{
return ecard_register_driver(&ether3_driver);
}
static void __exit ether3_exit(void)
{
ecard_remove_driver(&ether3_driver);
}
module_init(ether3_init);
module_exit(ether3_exit);
MODULE_LICENSE("GPL");
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