kevin/linux
1
Fork 0
Code
445b5b499e
linux/drivers/net/ariadne.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

878 lines
24 KiB
C
Raw Blame History

/*
* Amiga Linux/m68k Ariadne Ethernet Driver
*
* © Copyright 1995-2003 by Geert Uytterhoeven (geert@linux-m68k.org)
* Peter De Schrijver (p2@mind.be)
*
* ---------------------------------------------------------------------------
*
* This program is based on
*
* lance.c: An AMD LANCE ethernet driver for linux.
* Written 1993-94 by Donald Becker.
*
* Am79C960: PCnet(tm)-ISA Single-Chip Ethernet Controller
* Advanced Micro Devices
* Publication #16907, Rev. B, Amendment/0, May 1994
*
* MC68230: Parallel Interface/Timer (PI/T)
* Motorola Semiconductors, December, 1983
*
* ---------------------------------------------------------------------------
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of the Linux
* distribution for more details.
*
* ---------------------------------------------------------------------------
*
* The Ariadne is a Zorro-II board made by Village Tronic. It contains:
*
* - an Am79C960 PCnet-ISA Single-Chip Ethernet Controller with both
* 10BASE-2 (thin coax) and 10BASE-T (UTP) connectors
*
* - an MC68230 Parallel Interface/Timer configured as 2 parallel ports
*/
#include <linux/module.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/interrupt.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/zorro.h>
#include <linux/bitops.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>
#include <asm/irq.h>
#include "ariadne.h"
#ifdef ARIADNE_DEBUG
int ariadne_debug = ARIADNE_DEBUG;
#else
int ariadne_debug = 1;
#endif
/*
* Macros to Fix Endianness problems
*/
/* Swap the Bytes in a WORD */
#define swapw(x) (((x>>8)&0x00ff)|((x<<8)&0xff00))
/* Get the Low BYTE in a WORD */
#define lowb(x) (x&0xff)
/* Get the Swapped High WORD in a LONG */
#define swhighw(x) ((((x)>>8)&0xff00)|(((x)>>24)&0x00ff))
/* Get the Swapped Low WORD in a LONG */
#define swloww(x) ((((x)<<8)&0xff00)|(((x)>>8)&0x00ff))
/*
* Transmit/Receive Ring Definitions
*/
#define TX_RING_SIZE 5
#define RX_RING_SIZE 16
#define PKT_BUF_SIZE 1520
/*
* Private Device Data
*/
struct ariadne_private {
volatile struct TDRE *tx_ring[TX_RING_SIZE];
volatile struct RDRE *rx_ring[RX_RING_SIZE];
volatile u_short *tx_buff[TX_RING_SIZE];
volatile u_short *rx_buff[RX_RING_SIZE];
int cur_tx, cur_rx; /* The next free ring entry */
int dirty_tx; /* The ring entries to be free()ed. */
struct net_device_stats stats;
char tx_full;
};
/*
* Structure Created in the Ariadne's RAM Buffer
*/
struct lancedata {
struct TDRE tx_ring[TX_RING_SIZE];
struct RDRE rx_ring[RX_RING_SIZE];
u_short tx_buff[TX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
u_short rx_buff[RX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
};
static int ariadne_open(struct net_device *dev);
static void ariadne_init_ring(struct net_device *dev);
static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev);
static void ariadne_tx_timeout(struct net_device *dev);
static int ariadne_rx(struct net_device *dev);
static void ariadne_reset(struct net_device *dev);
static irqreturn_t ariadne_interrupt(int irq, void *data, struct pt_regs *fp);
static int ariadne_close(struct net_device *dev);
static struct net_device_stats *ariadne_get_stats(struct net_device *dev);
#ifdef HAVE_MULTICAST
static void set_multicast_list(struct net_device *dev);
#endif
static void memcpyw(volatile u_short *dest, u_short *src, int len)
{
while (len >= 2) {
*(dest++) = *(src++);
len -= 2;
}
if (len == 1)
*dest = (*(u_char *)src)<<8;
}
static int __devinit ariadne_init_one(struct zorro_dev *z,
const struct zorro_device_id *ent);
static void __devexit ariadne_remove_one(struct zorro_dev *z);
static struct zorro_device_id ariadne_zorro_tbl[] __devinitdata = {
{ ZORRO_PROD_VILLAGE_TRONIC_ARIADNE },
{ 0 }
};
static struct zorro_driver ariadne_driver = {
.name = "ariadne",
.id_table = ariadne_zorro_tbl,
.probe = ariadne_init_one,
.remove = __devexit_p(ariadne_remove_one),
};
static int __devinit ariadne_init_one(struct zorro_dev *z,
const struct zorro_device_id *ent)
{
unsigned long board = z->resource.start;
unsigned long base_addr = board+ARIADNE_LANCE;
unsigned long mem_start = board+ARIADNE_RAM;
struct resource *r1, *r2;
struct net_device *dev;
struct ariadne_private *priv;
int err;
r1 = request_mem_region(base_addr, sizeof(struct Am79C960), "Am79C960");
if (!r1)
return -EBUSY;
r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
if (!r2) {
release_resource(r1);
return -EBUSY;
}
dev = alloc_etherdev(sizeof(struct ariadne_private));
if (dev == NULL) {
release_resource(r1);
release_resource(r2);
return -ENOMEM;
}
SET_MODULE_OWNER(dev);
priv = netdev_priv(dev);
r1->name = dev->name;
r2->name = dev->name;
dev->dev_addr[0] = 0x00;
dev->dev_addr[1] = 0x60;
dev->dev_addr[2] = 0x30;
dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
dev->base_addr = ZTWO_VADDR(base_addr);
dev->mem_start = ZTWO_VADDR(mem_start);
dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE;
dev->open = &ariadne_open;
dev->stop = &ariadne_close;
dev->hard_start_xmit = &ariadne_start_xmit;
dev->tx_timeout = &ariadne_tx_timeout;
dev->watchdog_timeo = 5*HZ;
dev->get_stats = &ariadne_get_stats;
dev->set_multicast_list = &set_multicast_list;
err = register_netdev(dev);
if (err) {
release_resource(r1);
release_resource(r2);
free_netdev(dev);
return err;
}
zorro_set_drvdata(z, dev);
printk(KERN_INFO "%s: Ariadne at 0x%08lx, Ethernet Address "
"%02x:%02x:%02x:%02x:%02x:%02x\n", dev->name, board,
dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
return 0;
}
static int ariadne_open(struct net_device *dev)
{
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
u_short in;
u_long version;
int i;
/* Reset the LANCE */
in = lance->Reset;
/* Stop the LANCE */
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = STOP;
/* Check the LANCE version */
lance->RAP = CSR88; /* Chip ID */
version = swapw(lance->RDP);
lance->RAP = CSR89; /* Chip ID */
version |= swapw(lance->RDP)<<16;
if ((version & 0x00000fff) != 0x00000003) {
printk(KERN_WARNING "ariadne_open: Couldn't find AMD Ethernet Chip\n");
return -EAGAIN;
}
if ((version & 0x0ffff000) != 0x00003000) {
printk(KERN_WARNING "ariadne_open: Couldn't find Am79C960 (Wrong part "
"number = %ld)\n", (version & 0x0ffff000)>>12);
return -EAGAIN;
}
#if 0
printk(KERN_DEBUG "ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n",
(version & 0xf0000000)>>28);
#endif
ariadne_init_ring(dev);
/* Miscellaneous Stuff */
lance->RAP = CSR3; /* Interrupt Masks and Deferral Control */
lance->RDP = 0x0000;
lance->RAP = CSR4; /* Test and Features Control */
lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM;
/* Set the Multicast Table */
lance->RAP = CSR8; /* Logical Address Filter, LADRF[15:0] */
lance->RDP = 0x0000;
lance->RAP = CSR9; /* Logical Address Filter, LADRF[31:16] */
lance->RDP = 0x0000;
lance->RAP = CSR10; /* Logical Address Filter, LADRF[47:32] */
lance->RDP = 0x0000;
lance->RAP = CSR11; /* Logical Address Filter, LADRF[63:48] */
lance->RDP = 0x0000;
/* Set the Ethernet Hardware Address */
lance->RAP = CSR12; /* Physical Address Register, PADR[15:0] */
lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
lance->RAP = CSR13; /* Physical Address Register, PADR[31:16] */
lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
lance->RAP = CSR14; /* Physical Address Register, PADR[47:32] */
lance->RDP = ((u_short *)&dev->dev_addr[0])[2];
/* Set the Init Block Mode */
lance->RAP = CSR15; /* Mode Register */
lance->RDP = 0x0000;
/* Set the Transmit Descriptor Ring Pointer */
lance->RAP = CSR30; /* Base Address of Transmit Ring */
lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
lance->RAP = CSR31; /* Base Address of transmit Ring */
lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
/* Set the Receive Descriptor Ring Pointer */
lance->RAP = CSR24; /* Base Address of Receive Ring */
lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
lance->RAP = CSR25; /* Base Address of Receive Ring */
lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
/* Set the Number of RX and TX Ring Entries */
lance->RAP = CSR76; /* Receive Ring Length */
lance->RDP = swapw(((u_short)-RX_RING_SIZE));
lance->RAP = CSR78; /* Transmit Ring Length */
lance->RDP = swapw(((u_short)-TX_RING_SIZE));
/* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
lance->RAP = ISACSR2; /* Miscellaneous Configuration */
lance->IDP = ASEL;
/* LED Control */
lance->RAP = ISACSR5; /* LED1 Status */
lance->IDP = PSE|XMTE;
lance->RAP = ISACSR6; /* LED2 Status */
lance->IDP = PSE|COLE;
lance->RAP = ISACSR7; /* LED3 Status */
lance->IDP = PSE|RCVE;
netif_start_queue(dev);
i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, SA_SHIRQ,
dev->name, dev);
if (i) return i;
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = INEA|STRT;
return 0;
}
static void ariadne_init_ring(struct net_device *dev)
{
struct ariadne_private *priv = netdev_priv(dev);
volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
int i;
netif_stop_queue(dev);
priv->tx_full = 0;
priv->cur_rx = priv->cur_tx = 0;
priv->dirty_tx = 0;
/* Set up TX Ring */
for (i = 0; i < TX_RING_SIZE; i++) {
volatile struct TDRE *t = &lancedata->tx_ring[i];
t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i]));
t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) |
TF_STP | TF_ENP;
t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
t->TMD3 = 0;
priv->tx_ring[i] = &lancedata->tx_ring[i];
priv->tx_buff[i] = lancedata->tx_buff[i];
#if 0
printk(KERN_DEBUG "TX Entry %2d at %p, Buf at %p\n", i,
&lancedata->tx_ring[i], lancedata->tx_buff[i]);
#endif
}
/* Set up RX Ring */
for (i = 0; i < RX_RING_SIZE; i++) {
volatile struct RDRE *r = &lancedata->rx_ring[i];
r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i]));
r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) |
RF_OWN;
r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
r->RMD3 = 0x0000;
priv->rx_ring[i] = &lancedata->rx_ring[i];
priv->rx_buff[i] = lancedata->rx_buff[i];
#if 0
printk(KERN_DEBUG "RX Entry %2d at %p, Buf at %p\n", i,
&lancedata->rx_ring[i], lancedata->rx_buff[i]);
#endif
}
}
static int ariadne_close(struct net_device *dev)
{
struct ariadne_private *priv = netdev_priv(dev);
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
netif_stop_queue(dev);
lance->RAP = CSR112; /* Missed Frame Count */
priv->stats.rx_missed_errors = swapw(lance->RDP);
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
if (ariadne_debug > 1) {
printk(KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n",
dev->name, lance->RDP);
printk(KERN_DEBUG "%s: %lu packets missed\n", dev->name,
priv->stats.rx_missed_errors);
}
/* We stop the LANCE here -- it occasionally polls memory if we don't. */
lance->RDP = STOP;
free_irq(IRQ_AMIGA_PORTS, dev);
return 0;
}
static inline void ariadne_reset(struct net_device *dev)
{
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = STOP;
ariadne_init_ring(dev);
lance->RDP = INEA|STRT;
netif_start_queue(dev);
}
static irqreturn_t ariadne_interrupt(int irq, void *data, struct pt_regs *fp)
{
struct net_device *dev = (struct net_device *)data;
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
struct ariadne_private *priv;
int csr0, boguscnt;
int handled = 0;
if (dev == NULL) {
printk(KERN_WARNING "ariadne_interrupt(): irq for unknown device.\n");
return IRQ_NONE;
}
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
if (!(lance->RDP & INTR)) /* Check if any interrupt has been */
return IRQ_NONE; /* generated by the board. */
priv = netdev_priv(dev);
boguscnt = 10;
while ((csr0 = lance->RDP) & (ERR|RINT|TINT) && --boguscnt >= 0) {
/* Acknowledge all of the current interrupt sources ASAP. */
lance->RDP = csr0 & ~(INEA|TDMD|STOP|STRT|INIT);
#if 0
if (ariadne_debug > 5) {
printk(KERN_DEBUG "%s: interrupt csr0=%#2.2x new csr=%#2.2x.",
dev->name, csr0, lance->RDP);
printk("[");
if (csr0 & INTR)
printk(" INTR");
if (csr0 & INEA)
printk(" INEA");
if (csr0 & RXON)
printk(" RXON");
if (csr0 & TXON)
printk(" TXON");
if (csr0 & TDMD)
printk(" TDMD");
if (csr0 & STOP)
printk(" STOP");
if (csr0 & STRT)
printk(" STRT");
if (csr0 & INIT)
printk(" INIT");
if (csr0 & ERR)
printk(" ERR");
if (csr0 & BABL)
printk(" BABL");
if (csr0 & CERR)
printk(" CERR");
if (csr0 & MISS)
printk(" MISS");
if (csr0 & MERR)
printk(" MERR");
if (csr0 & RINT)
printk(" RINT");
if (csr0 & TINT)
printk(" TINT");
if (csr0 & IDON)
printk(" IDON");
printk(" ]\n");
}
#endif
if (csr0 & RINT) { /* Rx interrupt */
handled = 1;
ariadne_rx(dev);
}
if (csr0 & TINT) { /* Tx-done interrupt */
int dirty_tx = priv->dirty_tx;
handled = 1;
while (dirty_tx < priv->cur_tx) {
int entry = dirty_tx % TX_RING_SIZE;
int status = lowb(priv->tx_ring[entry]->TMD1);
if (status & TF_OWN)
break; /* It still hasn't been Txed */
priv->tx_ring[entry]->TMD1 &= 0xff00;
if (status & TF_ERR) {
/* There was an major error, log it. */
int err_status = priv->tx_ring[entry]->TMD3;
priv->stats.tx_errors++;
if (err_status & EF_RTRY)
priv->stats.tx_aborted_errors++;
if (err_status & EF_LCAR)
priv->stats.tx_carrier_errors++;
if (err_status & EF_LCOL)
priv->stats.tx_window_errors++;
if (err_status & EF_UFLO) {
/* Ackk! On FIFO errors the Tx unit is turned off! */
priv->stats.tx_fifo_errors++;
/* Remove this verbosity later! */
printk(KERN_ERR "%s: Tx FIFO error! Status %4.4x.\n",
dev->name, csr0);
/* Restart the chip. */
lance->RDP = STRT;
}
} else {
if (status & (TF_MORE|TF_ONE))
priv->stats.collisions++;
priv->stats.tx_packets++;
}
dirty_tx++;
}
#ifndef final_version
if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
printk(KERN_ERR "out-of-sync dirty pointer, %d vs. %d, "
"full=%d.\n", dirty_tx, priv->cur_tx, priv->tx_full);
dirty_tx += TX_RING_SIZE;
}
#endif
if (priv->tx_full && netif_queue_stopped(dev) &&
dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) {
/* The ring is no longer full. */
priv->tx_full = 0;
netif_wake_queue(dev);
}
priv->dirty_tx = dirty_tx;
}
/* Log misc errors. */
if (csr0 & BABL) {
handled = 1;
priv->stats.tx_errors++; /* Tx babble. */
}
if (csr0 & MISS) {
handled = 1;
priv->stats.rx_errors++; /* Missed a Rx frame. */
}
if (csr0 & MERR) {
handled = 1;
printk(KERN_ERR "%s: Bus master arbitration failure, status "
"%4.4x.\n", dev->name, csr0);
/* Restart the chip. */
lance->RDP = STRT;
}
}
/* Clear any other interrupt, and set interrupt enable. */
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = INEA|BABL|CERR|MISS|MERR|IDON;
#if 0
if (ariadne_debug > 4)
printk(KERN_DEBUG "%s: exiting interrupt, csr%d=%#4.4x.\n", dev->name,
lance->RAP, lance->RDP);
#endif
return IRQ_RETVAL(handled);
}
static void ariadne_tx_timeout(struct net_device *dev)
{
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
printk(KERN_ERR "%s: transmit timed out, status %4.4x, resetting.\n",
dev->name, lance->RDP);
ariadne_reset(dev);
netif_wake_queue(dev);
}
static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ariadne_private *priv = netdev_priv(dev);
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
int entry;
unsigned long flags;
int len = skb->len;
#if 0
if (ariadne_debug > 3) {
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
printk(KERN_DEBUG "%s: ariadne_start_xmit() called, csr0 %4.4x.\n",
dev->name, lance->RDP);
lance->RDP = 0x0000;
}
#endif
/* FIXME: is the 79C960 new enough to do its own padding right ? */
if (skb->len < ETH_ZLEN)
{
if (skb_padto(skb, ETH_ZLEN))
return 0;
len = ETH_ZLEN;
}
/* Fill in a Tx ring entry */
#if 0
printk(KERN_DEBUG "TX pkt type 0x%04x from ", ((u_short *)skb->data)[6]);
{
int i;
u_char *ptr = &((u_char *)skb->data)[6];
for (i = 0; i < 6; i++)
printk("%02x", ptr[i]);
}
printk(" to ");
{
int i;
u_char *ptr = (u_char *)skb->data;
for (i = 0; i < 6; i++)
printk("%02x", ptr[i]);
}
printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
#endif
local_irq_save(flags);
entry = priv->cur_tx % TX_RING_SIZE;
/* Caution: the write order is important here, set the base address with
the "ownership" bits last. */
priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
priv->tx_ring[entry]->TMD3 = 0x0000;
memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len);
#if 0
{
int i, len;
len = skb->len > 64 ? 64 : skb->len;
len >>= 1;
for (i = 0; i < len; i += 8) {
int j;
printk(KERN_DEBUG "%04x:", i);
for (j = 0; (j < 8) && ((i+j) < len); j++) {
if (!(j & 1))
printk(" ");
printk("%04x", priv->tx_buff[entry][i+j]);
}
printk("\n");
}
}
#endif
priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP;
dev_kfree_skb(skb);
priv->cur_tx++;
if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) {
#if 0
printk(KERN_DEBUG "*** Subtracting TX_RING_SIZE from cur_tx (%d) and "
"dirty_tx (%d)\n", priv->cur_tx, priv->dirty_tx);
#endif
priv->cur_tx -= TX_RING_SIZE;
priv->dirty_tx -= TX_RING_SIZE;
}
/* Trigger an immediate send poll. */
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = INEA|TDMD;
dev->trans_start = jiffies;
if (lowb(priv->tx_ring[(entry+1) % TX_RING_SIZE]->TMD1) != 0) {
netif_stop_queue(dev);
priv->tx_full = 1;
}
local_irq_restore(flags);
return 0;
}
static int ariadne_rx(struct net_device *dev)
{
struct ariadne_private *priv = netdev_priv(dev);
int entry = priv->cur_rx % RX_RING_SIZE;
int i;
/* If we own the next entry, it's a new packet. Send it up. */
while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
int status = lowb(priv->rx_ring[entry]->RMD1);
if (status != (RF_STP|RF_ENP)) { /* There was an error. */
/* There is a tricky error noted by John Murphy,
<murf@perftech.com> to Russ Nelson: Even with full-sized
buffers it's possible for a jabber packet to use two
buffers, with only the last correctly noting the error. */
if (status & RF_ENP)
/* Only count a general error at the end of a packet.*/
priv->stats.rx_errors++;
if (status & RF_FRAM)
priv->stats.rx_frame_errors++;
if (status & RF_OFLO)
priv->stats.rx_over_errors++;
if (status & RF_CRC)
priv->stats.rx_crc_errors++;
if (status & RF_BUFF)
priv->stats.rx_fifo_errors++;
priv->rx_ring[entry]->RMD1 &= 0xff00|RF_STP|RF_ENP;
} else {
/* Malloc up new buffer, compatible with net-3. */
short pkt_len = swapw(priv->rx_ring[entry]->RMD3);
struct sk_buff *skb;
skb = dev_alloc_skb(pkt_len+2);
if (skb == NULL) {
printk(KERN_WARNING "%s: Memory squeeze, deferring packet.\n",
dev->name);
for (i = 0; i < RX_RING_SIZE; i++)
if (lowb(priv->rx_ring[(entry+i) % RX_RING_SIZE]->RMD1) & RF_OWN)
break;
if (i > RX_RING_SIZE-2) {
priv->stats.rx_dropped++;
priv->rx_ring[entry]->RMD1 |= RF_OWN;
priv->cur_rx++;
}
break;
}
skb->dev = dev;
skb_reserve(skb,2); /* 16 byte align */
skb_put(skb,pkt_len); /* Make room */
eth_copy_and_sum(skb, (char *)priv->rx_buff[entry], pkt_len,0);
skb->protocol=eth_type_trans(skb,dev);
#if 0
printk(KERN_DEBUG "RX pkt type 0x%04x from ",
((u_short *)skb->data)[6]);
{
int i;
u_char *ptr = &((u_char *)skb->data)[6];
for (i = 0; i < 6; i++)
printk("%02x", ptr[i]);
}
printk(" to ");
{
int i;
u_char *ptr = (u_char *)skb->data;
for (i = 0; i < 6; i++)
printk("%02x", ptr[i]);
}
printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
#endif
netif_rx(skb);
dev->last_rx = jiffies;
priv->stats.rx_packets++;
priv->stats.rx_bytes += pkt_len;
}
priv->rx_ring[entry]->RMD1 |= RF_OWN;
entry = (++priv->cur_rx) % RX_RING_SIZE;
}
priv->cur_rx = priv->cur_rx % RX_RING_SIZE;
/* We should check that at least two ring entries are free. If not,
we should free one and mark stats->rx_dropped++. */
return 0;
}
static struct net_device_stats *ariadne_get_stats(struct net_device *dev)
{
struct ariadne_private *priv = netdev_priv(dev);
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
short saved_addr;
unsigned long flags;
local_irq_save(flags);
saved_addr = lance->RAP;
lance->RAP = CSR112; /* Missed Frame Count */
priv->stats.rx_missed_errors = swapw(lance->RDP);
lance->RAP = saved_addr;
local_irq_restore(flags);
return &priv->stats;
}
/* Set or clear the multicast filter for this adaptor.
num_addrs == -1 Promiscuous mode, receive all packets
num_addrs == 0 Normal mode, clear multicast list
num_addrs > 0 Multicast mode, receive normal and MC packets, and do
best-effort filtering.
*/
static void set_multicast_list(struct net_device *dev)
{
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
if (!netif_running(dev))
return;
netif_stop_queue(dev);
/* We take the simple way out and always enable promiscuous mode. */
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = STOP; /* Temporarily stop the lance. */
ariadne_init_ring(dev);
if (dev->flags & IFF_PROMISC) {
/* Log any net taps. */
printk(KERN_INFO "%s: Promiscuous mode enabled.\n", dev->name);
lance->RAP = CSR15; /* Mode Register */
lance->RDP = PROM; /* Set promiscuous mode */
} else {
short multicast_table[4];
int num_addrs = dev->mc_count;
int i;
/* We don't use the multicast table, but rely on upper-layer filtering. */
memset(multicast_table, (num_addrs == 0) ? 0 : -1,
sizeof(multicast_table));
for (i = 0; i < 4; i++) {
lance->RAP = CSR8+(i<<8); /* Logical Address Filter */
lance->RDP = swapw(multicast_table[i]);
}
lance->RAP = CSR15; /* Mode Register */
lance->RDP = 0x0000; /* Unset promiscuous mode */
}
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = INEA|STRT|IDON; /* Resume normal operation. */
netif_wake_queue(dev);
}
static void __devexit ariadne_remove_one(struct zorro_dev *z)
{
struct net_device *dev = zorro_get_drvdata(z);
unregister_netdev(dev);
release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960));
release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE);
free_netdev(dev);
}
static int __init ariadne_init_module(void)
{
return zorro_register_driver(&ariadne_driver);
}
static void __exit ariadne_cleanup_module(void)
{
zorro_unregister_driver(&ariadne_driver);
}
module_init(ariadne_init_module);
module_exit(ariadne_cleanup_module);
MODULE_LICENSE("GPL");
View Git Blame Copy Permalink