// SPDX-License-Identifier: GPL-1.0+
/* lasi_82596.c -- driver for the intel 82596 ethernet controller, as
munged into HPPA boxen .
This driver is based upon 82596 . c , original credits are below . . .
but there were too many hoops which HP wants jumped through to
keep this code in there in a sane manner .
3 primary sources of the mess - -
1 ) hppa needs * lots * of cacheline flushing to keep this kind of
MMIO running .
2 ) The 82596 needs to see all of its pointers as their physical
address . Thus virt_to_bus / bus_to_virt are * everywhere * .
3 ) The implementation HP is using seems to be significantly pickier
about when and how the command and RX units are started . some
command ordering was changed .
Examination of the mach driver leads one to believe that there
might be a saner way to pull this off . . . anyone who feels like a
full rewrite can be my guest .
Split 02 / 13 / 2000 Sam Creasey ( sammy @ oh . verio . com )
02 / 01 / 2000 Initial modifications for parisc by Helge Deller ( deller @ gmx . de )
03 / 02 / 2000 changes for better / correct ( ? ) cache - flushing ( deller )
*/
/* 82596.c: A generic 82596 ethernet driver for linux. */
/*
Based on Apricot . c
Written 1994 by Mark Evans .
This driver is for the Apricot 82596 bus - master interface
Modularised 12 / 94 Mark Evans
Modified to support the 82596 ethernet chips on 680 x0 VME boards .
by Richard Hirst < richard @ sleepie . demon . co . uk >
Renamed to be 82596 . c
980825 : Changed to receive directly in to sk_buffs which are
allocated at open ( ) time . Eliminates copy on incoming frames
( small ones are still copied ) . Shared data now held in a
non - cached page , so we can run on 68060 in copyback mode .
TBD :
* look at deferring rx frames rather than discarding ( as per tulip )
* handle tx ring full as per tulip
* performance test to tune rx_copybreak
Most of my modifications relate to the braindead big - endian
implementation by Intel . When the i596 is operating in
' big - endian ' mode , it thinks a 32 bit value of 0 x12345678
should be stored as 0 x56781234 . This is a real pain , when
you have linked lists which are shared by the 680 x0 and the
i596 .
Driver skeleton
Written 1993 by Donald Becker .
Copyright 1993 United States Government as represented by the Director ,
National Security Agency .
The author may be reached as becker @ scyld . com , or C / O
Scyld Computing Corporation , 410 Severn Ave . , Suite 210 , Annapolis MD 21403
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/gfp.h>
/* DEBUG flags
*/
#define DEB_INIT 0 x0001
#define DEB_PROBE 0 x0002
#define DEB_SERIOUS 0 x0004
#define DEB_ERRORS 0 x0008
#define DEB_MULTI 0 x0010
#define DEB_TDR 0 x0020
#define DEB_OPEN 0 x0040
#define DEB_RESET 0 x0080
#define DEB_ADDCMD 0 x0100
#define DEB_STATUS 0 x0200
#define DEB_STARTTX 0 x0400
#define DEB_RXADDR 0 x0800
#define DEB_TXADDR 0 x1000
#define DEB_RXFRAME 0 x2000
#define DEB_INTS 0 x4000
#define DEB_STRUCT 0 x8000
#define DEB_ANY 0 xffff
#define DEB(x, y) if (i596_debug & (x)) { y; }
/*
* The MPU_PORT command allows direct access to the 82596 . With PORT access
* the following commands are available ( p5 - 18 ) . The 32 - bit port command
* must be word - swapped with the most significant word written first .
* This only applies to VME boards .
*/
#define PORT_RESET 0 x00 /* reset 82596 */
#define PORT_SELFTEST 0 x01 /* selftest */
#define PORT_ALTSCP 0 x02 /* alternate SCB address */
#define PORT_ALTDUMP 0 x03 /* Alternate DUMP address */
static int i596_debug = (DEB_SERIOUS|DEB_PROBE);
/* Copy frames shorter than rx_copybreak, otherwise pass on up in
* a full sized sk_buff . Value of 100 stolen from tulip . c ( ! alpha ) .
*/
static int rx_copybreak = 100 ;
#define PKT_BUF_SZ 1536
#define MAX_MC_CNT 64
#define ISCP_BUSY 0 x0001
#define I596_NULL ((u32)0 xffffffff)
#define CMD_EOL 0 x8000 /* The last command of the list, stop. */
#define CMD_SUSP 0 x4000 /* Suspend after doing cmd. */
#define CMD_INTR 0 x2000 /* Interrupt after doing cmd. */
#define CMD_FLEX 0 x0008 /* Enable flexible memory model */
enum commands {
CmdNOp = 0 , CmdSASetup = 1 , CmdConfigure = 2 , CmdMulticastList = 3 ,
CmdTx = 4 , CmdTDR = 5 , CmdDump = 6 , CmdDiagnose = 7
};
#define STAT_C 0 x8000 /* Set to 0 after execution */
#define STAT_B 0 x4000 /* Command being executed */
#define STAT_OK 0 x2000 /* Command executed ok */
#define STAT_A 0 x1000 /* Command aborted */
#define CUC_START 0 x0100
#define CUC_RESUME 0 x0200
#define CUC_SUSPEND 0 x0300
#define CUC_ABORT 0 x0400
#define RX_START 0 x0010
#define RX_RESUME 0 x0020
#define RX_SUSPEND 0 x0030
#define RX_ABORT 0 x0040
#define TX_TIMEOUT (HZ/20 )
struct i596_reg {
unsigned short porthi;
unsigned short portlo;
u32 ca;
};
#define EOF 0 x8000
#define SIZE_MASK 0 x3fff
struct i596_tbd {
unsigned short size;
unsigned short pad;
u32 next;
u32 data;
u32 cache_pad[5 ]; /* Total 32 bytes... */
};
/* The command structure has two 'next' pointers; v_next is the address of
* the next command as seen by the CPU , b_next is the address of the next
* command as seen by the 82596 . The b_next pointer , as used by the 82596
* always references the status field of the next command , rather than the
* v_next field , because the 82596 is unaware of v_next . It may seem more
* logical to put v_next at the end of the structure , but we cannot do that
* because the 82596 expects other fields to be there , depending on command
* type .
*/
struct i596_cmd {
struct i596_cmd *v_next; /* Address from CPUs viewpoint */
unsigned short status;
unsigned short command;
u32 b_next; /* Address from i596 viewpoint */
};
struct tx_cmd {
struct i596_cmd cmd;
u32 tbd;
unsigned short size;
unsigned short pad;
struct sk_buff *skb; /* So we can free it after tx */
dma_addr_t dma_addr;
#ifdef __LP64__
u32 cache_pad[6 ]; /* Total 64 bytes... */
#else
u32 cache_pad[1 ]; /* Total 32 bytes... */
#endif
};
struct tdr_cmd {
struct i596_cmd cmd;
unsigned short status;
unsigned short pad;
};
struct mc_cmd {
struct i596_cmd cmd;
short mc_cnt;
char mc_addrs[MAX_MC_CNT*6 ];
};
struct sa_cmd {
struct i596_cmd cmd;
char eth_addr[8 ];
};
struct cf_cmd {
struct i596_cmd cmd;
char i596_config[16 ];
};
struct i596_rfd {
unsigned short stat;
unsigned short cmd;
u32 b_next; /* Address from i596 viewpoint */
u32 rbd;
unsigned short count;
unsigned short size;
struct i596_rfd *v_next; /* Address from CPUs viewpoint */
struct i596_rfd *v_prev;
#ifndef __LP64__
u32 cache_pad[2 ]; /* Total 32 bytes... */
#endif
};
struct i596_rbd {
/* hardware data */
unsigned short count;
unsigned short zero1;
u32 b_next;
u32 b_data; /* Address from i596 viewpoint */
unsigned short size;
unsigned short zero2;
/* driver data */
struct sk_buff *skb;
struct i596_rbd *v_next;
u32 b_addr; /* This rbd addr from i596 view */
unsigned char *v_data; /* Address from CPUs viewpoint */
/* Total 32 bytes... */
#ifdef __LP64__
u32 cache_pad[4 ];
#endif
};
/* These values as chosen so struct i596_dma fits in one page... */
#define TX_RING_SIZE 32
#define RX_RING_SIZE 16
struct i596_scb {
unsigned short status;
unsigned short command;
u32 cmd;
u32 rfd;
u32 crc_err;
u32 align_err;
u32 resource_err;
u32 over_err;
u32 rcvdt_err;
u32 short_err;
unsigned short t_on;
unsigned short t_off;
};
struct i596_iscp {
u32 stat;
u32 scb;
};
struct i596_scp {
u32 sysbus;
u32 pad;
u32 iscp;
};
struct i596_dma {
struct i596_scp scp __attribute__((aligned(32 )));
volatile struct i596_iscp iscp __attribute__((aligned(32 )));
volatile struct i596_scb scb __attribute__((aligned(32 )));
struct sa_cmd sa_cmd __attribute__((aligned(32 )));
struct cf_cmd cf_cmd __attribute__((aligned(32 )));
struct tdr_cmd tdr_cmd __attribute__((aligned(32 )));
struct mc_cmd mc_cmd __attribute__((aligned(32 )));
struct i596_rfd rfds[RX_RING_SIZE] __attribute__((aligned(32 )));
struct i596_rbd rbds[RX_RING_SIZE] __attribute__((aligned(32 )));
struct tx_cmd tx_cmds[TX_RING_SIZE] __attribute__((aligned(32 )));
struct i596_tbd tbds[TX_RING_SIZE] __attribute__((aligned(32 )));
};
struct i596_private {
struct i596_dma *dma;
u32 stat;
int last_restart;
struct i596_rfd *rfd_head;
struct i596_rbd *rbd_head;
struct i596_cmd *cmd_tail;
struct i596_cmd *cmd_head;
int cmd_backlog;
u32 last_cmd;
int next_tx_cmd;
int options;
spinlock_t lock; /* serialize access to chip */
dma_addr_t dma_addr;
void __iomem *mpu_port;
void __iomem *ca;
};
static const char init_setup[] =
{
0 x8E, /* length, prefetch on */
0 xC8, /* fifo to 8, monitor off */
0 x80, /* don't save bad frames */
0 x2E, /* No source address insertion, 8 byte preamble */
0 x00, /* priority and backoff defaults */
0 x60, /* interframe spacing */
0 x00, /* slot time LSB */
0 xf2, /* slot time and retries */
0 x00, /* promiscuous mode */
0 x00, /* collision detect */
0 x40, /* minimum frame length */
0 xff,
0 x00,
0 x7f /* *multi IA */ };
static int i596_open(struct net_device *dev);
static netdev_tx_t i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t i596_interrupt(int irq, void *dev_id);
static int i596_close(struct net_device *dev);
static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd);
static void i596_tx_timeout (struct net_device *dev, unsigned int txqueue);
static void print_eth(unsigned char *buf, char *str);
static void set_multicast_list(struct net_device *dev);
static inline void ca(struct net_device *dev);
static void mpu_port(struct net_device *dev, int c, dma_addr_t x);
static int rx_ring_size = RX_RING_SIZE;
static int ticks_limit = 100 ;
static int max_cmd_backlog = TX_RING_SIZE-1 ;
#ifdef CONFIG_NET_POLL_CONTROLLER
static void i596_poll_controller(struct net_device *dev);
#endif
static inline dma_addr_t virt_to_dma(struct i596_private *lp, volatile void *v)
{
return lp->dma_addr + ((unsigned long )v - (unsigned long )lp->dma);
}
#ifdef NONCOHERENT_DMA
static inline void dma_sync_dev(struct net_device *ndev, volatile void *addr,
size_t len)
{
dma_sync_single_for_device(ndev->dev.parent,
virt_to_dma(netdev_priv(ndev), addr), len,
DMA_BIDIRECTIONAL);
}
static inline void dma_sync_cpu(struct net_device *ndev, volatile void *addr,
size_t len)
{
dma_sync_single_for_cpu(ndev->dev.parent,
virt_to_dma(netdev_priv(ndev), addr), len,
DMA_BIDIRECTIONAL);
}
#else
static inline void dma_sync_dev(struct net_device *ndev, volatile void *addr,
size_t len)
{
}
static inline void dma_sync_cpu(struct net_device *ndev, volatile void *addr,
size_t len)
{
}
#endif /* NONCOHERENT_DMA */
static inline int wait_istat(struct net_device *dev, struct i596_dma *dma, int delcnt, char *str)
{
dma_sync_cpu(dev, &(dma->iscp), sizeof (struct i596_iscp));
while (--delcnt && dma->iscp.stat) {
udelay(10 );
dma_sync_cpu(dev, &(dma->iscp), sizeof (struct i596_iscp));
}
if (!delcnt) {
printk(KERN_ERR "%s: %s, iscp.stat %04x, didn't clear\n" ,
dev->name, str, SWAP16(dma->iscp.stat));
return -1 ;
} else
return 0 ;
}
static inline int wait_cmd(struct net_device *dev, struct i596_dma *dma, int delcnt, char *str)
{
dma_sync_cpu(dev, &(dma->scb), sizeof (struct i596_scb));
while (--delcnt && dma->scb.command) {
udelay(10 );
dma_sync_cpu(dev, &(dma->scb), sizeof (struct i596_scb));
}
if (!delcnt) {
printk(KERN_ERR "%s: %s, status %4.4x, cmd %4.4x.\n" ,
dev->name, str,
SWAP16(dma->scb.status),
SWAP16(dma->scb.command));
return -1 ;
} else
return 0 ;
}
static void i596_display_data(struct net_device *dev)
{
struct i596_private *lp = netdev_priv(dev);
struct i596_dma *dma = lp->dma;
struct i596_cmd *cmd;
struct i596_rfd *rfd;
struct i596_rbd *rbd;
printk(KERN_DEBUG "lp and scp at %p, .sysbus = %08x, .iscp = %08x\n" ,
&dma->scp, dma->scp.sysbus, SWAP32(dma->scp.iscp));
printk(KERN_DEBUG "iscp at %p, iscp.stat = %08x, .scb = %08x\n" ,
&dma->iscp, SWAP32(dma->iscp.stat), SWAP32(dma->iscp.scb));
printk(KERN_DEBUG "scb at %p, scb.status = %04x, .command = %04x,"
" .cmd = %08x, .rfd = %08x\n" ,
&dma->scb, SWAP16(dma->scb.status), SWAP16(dma->scb.command),
SWAP16(dma->scb.cmd), SWAP32(dma->scb.rfd));
printk(KERN_DEBUG " errors: crc %x, align %x, resource %x,"
" over %x, rcvdt %x, short %x\n" ,
SWAP32(dma->scb.crc_err), SWAP32(dma->scb.align_err),
SWAP32(dma->scb.resource_err), SWAP32(dma->scb.over_err),
SWAP32(dma->scb.rcvdt_err), SWAP32(dma->scb.short_err));
cmd = lp->cmd_head;
while (cmd != NULL) {
printk(KERN_DEBUG
"cmd at %p, .status = %04x, .command = %04x,"
" .b_next = %08x\n" ,
cmd, SWAP16(cmd->status), SWAP16(cmd->command),
SWAP32(cmd->b_next));
cmd = cmd->v_next;
}
rfd = lp->rfd_head;
printk(KERN_DEBUG "rfd_head = %p\n" , rfd);
do {
printk(KERN_DEBUG
" %p .stat %04x, .cmd %04x, b_next %08x, rbd %08x,"
" count %04x\n" ,
rfd, SWAP16(rfd->stat), SWAP16(rfd->cmd),
SWAP32(rfd->b_next), SWAP32(rfd->rbd),
SWAP16(rfd->count));
rfd = rfd->v_next;
} while (rfd != lp->rfd_head);
rbd = lp->rbd_head;
printk(KERN_DEBUG "rbd_head = %p\n" , rbd);
do {
printk(KERN_DEBUG
" %p .count %04x, b_next %08x, b_data %08x,"
" size %04x\n" ,
rbd, SWAP16(rbd->count), SWAP32(rbd->b_next),
SWAP32(rbd->b_data), SWAP16(rbd->size));
rbd = rbd->v_next;
} while (rbd != lp->rbd_head);
dma_sync_cpu(dev, dma, sizeof (struct i596_dma));
}
static inline int init_rx_bufs(struct net_device *dev)
{
struct i596_private *lp = netdev_priv(dev);
struct i596_dma *dma = lp->dma;
int i;
struct i596_rfd *rfd;
struct i596_rbd *rbd;
/* First build the Receive Buffer Descriptor List */
for (i = 0 , rbd = dma->rbds; i < rx_ring_size; i++, rbd++) {
dma_addr_t dma_addr;
struct sk_buff *skb;
skb = netdev_alloc_skb_ip_align(dev, PKT_BUF_SZ);
if (skb == NULL)
return -1 ;
dma_addr = dma_map_single(dev->dev.parent, skb->data,
PKT_BUF_SZ, DMA_FROM_DEVICE);
rbd->v_next = rbd+1 ;
rbd->b_next = SWAP32(virt_to_dma(lp, rbd+1 ));
rbd->b_addr = SWAP32(virt_to_dma(lp, rbd));
rbd->skb = skb;
rbd->v_data = skb->data;
rbd->b_data = SWAP32(dma_addr);
rbd->size = SWAP16(PKT_BUF_SZ);
}
lp->rbd_head = dma->rbds;
rbd = dma->rbds + rx_ring_size - 1 ;
rbd->v_next = dma->rbds;
rbd->b_next = SWAP32(virt_to_dma(lp, dma->rbds));
/* Now build the Receive Frame Descriptor List */
for (i = 0 , rfd = dma->rfds; i < rx_ring_size; i++, rfd++) {
rfd->rbd = I596_NULL;
rfd->v_next = rfd+1 ;
rfd->v_prev = rfd-1 ;
rfd->b_next = SWAP32(virt_to_dma(lp, rfd+1 ));
rfd->cmd = SWAP16(CMD_FLEX);
}
lp->rfd_head = dma->rfds;
dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
rfd = dma->rfds;
rfd->rbd = SWAP32(virt_to_dma(lp, lp->rbd_head));
rfd->v_prev = dma->rfds + rx_ring_size - 1 ;
rfd = dma->rfds + rx_ring_size - 1 ;
rfd->v_next = dma->rfds;
rfd->b_next = SWAP32(virt_to_dma(lp, dma->rfds));
rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
dma_sync_dev(dev, dma, sizeof (struct i596_dma));
return 0 ;
}
static inline void remove_rx_bufs(struct net_device *dev)
{
struct i596_private *lp = netdev_priv(dev);
struct i596_rbd *rbd;
int i;
for (i = 0 , rbd = lp->dma->rbds; i < rx_ring_size; i++, rbd++) {
if (rbd->skb == NULL)
break ;
dma_unmap_single(dev->dev.parent,
(dma_addr_t)SWAP32(rbd->b_data),
PKT_BUF_SZ, DMA_FROM_DEVICE);
dev_kfree_skb(rbd->skb);
}
}
static void rebuild_rx_bufs(struct net_device *dev)
{
struct i596_private *lp = netdev_priv(dev);
struct i596_dma *dma = lp->dma;
int i;
/* Ensure rx frame/buffer descriptors are tidy */
for (i = 0 ; i < rx_ring_size; i++) {
dma->rfds[i].rbd = I596_NULL;
dma->rfds[i].cmd = SWAP16(CMD_FLEX);
}
dma->rfds[rx_ring_size-1 ].cmd = SWAP16(CMD_EOL|CMD_FLEX);
lp->rfd_head = dma->rfds;
dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
lp->rbd_head = dma->rbds;
dma->rfds[0 ].rbd = SWAP32(virt_to_dma(lp, dma->rbds));
dma_sync_dev(dev, dma, sizeof (struct i596_dma));
}
static int init_i596_mem(struct net_device *dev)
{
struct i596_private *lp = netdev_priv(dev);
struct i596_dma *dma = lp->dma;
unsigned long flags;
mpu_port(dev, PORT_RESET, 0 );
udelay(100 ); /* Wait 100us - seems to help */
/* change the scp address */
lp->last_cmd = jiffies;
dma->scp.sysbus = SYSBUS;
dma->scp.iscp = SWAP32(virt_to_dma(lp, &(dma->iscp)));
dma->iscp.scb = SWAP32(virt_to_dma(lp, &(dma->scb)));
dma->iscp.stat = SWAP32(ISCP_BUSY);
lp->cmd_backlog = 0 ;
lp->cmd_head = NULL;
dma->scb.cmd = I596_NULL;
DEB(DEB_INIT, printk(KERN_DEBUG "%s: starting i82596.\n" , dev->name));
dma_sync_dev(dev, &(dma->scp), sizeof (struct i596_scp));
dma_sync_dev(dev, &(dma->iscp), sizeof (struct i596_iscp));
dma_sync_dev(dev, &(dma->scb), sizeof (struct i596_scb));
mpu_port(dev, PORT_ALTSCP, virt_to_dma(lp, &dma->scp));
ca(dev);
if (wait_istat(dev, dma, 1000 , "initialization timed out" ))
goto failed;
DEB(DEB_INIT, printk(KERN_DEBUG
"%s: i82596 initialization successful\n" ,
dev->name));
if (request_irq(dev->irq, i596_interrupt, 0 , "i82596" , dev)) {
printk(KERN_ERR "%s: IRQ %d not free\n" , dev->name, dev->irq);
goto failed;
}
/* Ensure rx frame/buffer descriptors are tidy */
rebuild_rx_bufs(dev);
dma->scb.command = 0 ;
dma_sync_dev(dev, &(dma->scb), sizeof (struct i596_scb));
DEB(DEB_INIT, printk(KERN_DEBUG
"%s: queuing CmdConfigure\n" , dev->name));
memcpy(dma->cf_cmd.i596_config, init_setup, 14 );
dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
dma_sync_dev(dev, &(dma->cf_cmd), sizeof (struct cf_cmd));
i596_add_cmd(dev, &dma->cf_cmd.cmd);
DEB(DEB_INIT, printk(KERN_DEBUG "%s: queuing CmdSASetup\n" , dev->name));
memcpy(dma->sa_cmd.eth_addr, dev->dev_addr, ETH_ALEN);
dma->sa_cmd.cmd.command = SWAP16(CmdSASetup);
dma_sync_dev(dev, &(dma->sa_cmd), sizeof (struct sa_cmd));
i596_add_cmd(dev, &dma->sa_cmd.cmd);
DEB(DEB_INIT, printk(KERN_DEBUG "%s: queuing CmdTDR\n" , dev->name));
dma->tdr_cmd.cmd.command = SWAP16(CmdTDR);
dma_sync_dev(dev, &(dma->tdr_cmd), sizeof (struct tdr_cmd));
i596_add_cmd(dev, &dma->tdr_cmd.cmd);
spin_lock_irqsave (&lp->lock, flags);
if (wait_cmd(dev, dma, 1000 , "timed out waiting to issue RX_START" )) {
spin_unlock_irqrestore (&lp->lock, flags);
goto failed_free_irq;
}
DEB(DEB_INIT, printk(KERN_DEBUG "%s: Issuing RX_START\n" , dev->name));
dma->scb.command = SWAP16(RX_START);
dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
dma_sync_dev(dev, &(dma->scb), sizeof (struct i596_scb));
ca(dev);
spin_unlock_irqrestore (&lp->lock, flags);
if (wait_cmd(dev, dma, 1000 , "RX_START not processed" ))
goto failed_free_irq;
DEB(DEB_INIT, printk(KERN_DEBUG
"%s: Receive unit started OK\n" , dev->name));
return 0 ;
failed_free_irq:
free_irq(dev->irq, dev);
failed:
printk(KERN_ERR "%s: Failed to initialise 82596\n" , dev->name);
mpu_port(dev, PORT_RESET, 0 );
return -1 ;
}
static inline int i596_rx(struct net_device *dev)
{
struct i596_private *lp = netdev_priv(dev);
struct i596_rfd *rfd;
struct i596_rbd *rbd;
int frames = 0 ;
DEB(DEB_RXFRAME, printk(KERN_DEBUG
"i596_rx(), rfd_head %p, rbd_head %p\n" ,
lp->rfd_head, lp->rbd_head));
rfd = lp->rfd_head; /* Ref next frame to check */
dma_sync_cpu(dev, rfd, sizeof (struct i596_rfd));
while (rfd->stat & SWAP16(STAT_C)) { /* Loop while complete frames */
if (rfd->rbd == I596_NULL)
rbd = NULL;
else if (rfd->rbd == lp->rbd_head->b_addr) {
rbd = lp->rbd_head;
dma_sync_cpu(dev, rbd, sizeof (struct i596_rbd));
} else {
printk(KERN_ERR "%s: rbd chain broken!\n" , dev->name);
/* XXX Now what? */
rbd = NULL;
}
DEB(DEB_RXFRAME, printk(KERN_DEBUG
" rfd %p, rfd.rbd %08x, rfd.stat %04x\n" ,
rfd, rfd->rbd, rfd->stat));
if (rbd != NULL && (rfd->stat & SWAP16(STAT_OK))) {
/* a good frame */
int pkt_len = SWAP16(rbd->count) & 0 x3fff;
struct sk_buff *skb = rbd->skb;
int rx_in_place = 0 ;
DEB(DEB_RXADDR, print_eth(rbd->v_data, "received" ));
frames++;
/* Check if the packet is long enough to just accept
* without copying to a properly sized skbuff .
*/
if (pkt_len > rx_copybreak) {
struct sk_buff *newskb;
dma_addr_t dma_addr;
dma_unmap_single(dev->dev.parent,
(dma_addr_t)SWAP32(rbd->b_data),
PKT_BUF_SZ, DMA_FROM_DEVICE);
/* Get fresh skbuff to replace filled one. */
newskb = netdev_alloc_skb_ip_align(dev,
PKT_BUF_SZ);
if (newskb == NULL) {
skb = NULL; /* drop pkt */
goto memory_squeeze;
}
/* Pass up the skb already on the Rx ring. */
skb_put(skb, pkt_len);
rx_in_place = 1 ;
rbd->skb = newskb;
dma_addr = dma_map_single(dev->dev.parent,
newskb->data,
PKT_BUF_SZ,
DMA_FROM_DEVICE);
rbd->v_data = newskb->data;
rbd->b_data = SWAP32(dma_addr);
dma_sync_dev(dev, rbd, sizeof (struct i596_rbd));
} else {
skb = netdev_alloc_skb_ip_align(dev, pkt_len);
}
memory_squeeze:
if (skb == NULL) {
/* XXX tulip.c can defer packets here!! */
dev->stats.rx_dropped++;
} else {
if (!rx_in_place) {
/* 16 byte align the data fields */
dma_sync_single_for_cpu(dev->dev.parent,
(dma_addr_t)SWAP32(rbd->b_data),
PKT_BUF_SZ, DMA_FROM_DEVICE);
skb_put_data(skb, rbd->v_data,
pkt_len);
dma_sync_single_for_device(dev->dev.parent,
(dma_addr_t)SWAP32(rbd->b_data),
PKT_BUF_SZ, DMA_FROM_DEVICE);
}
skb->len = pkt_len;
skb->protocol = eth_type_trans(skb, dev);
netif_rx(skb);
dev->stats.rx_packets++;
dev->stats.rx_bytes += pkt_len;
}
} else {
DEB(DEB_ERRORS, printk(KERN_DEBUG
"%s: Error, rfd.stat = 0x%04x\n" ,
dev->name, rfd->stat));
dev->stats.rx_errors++;
if (rfd->stat & SWAP16(0 x0100))
dev->stats.collisions++;
if (rfd->stat & SWAP16(0 x8000))
dev->stats.rx_length_errors++;
if (rfd->stat & SWAP16(0 x0001))
dev->stats.rx_over_errors++;
if (rfd->stat & SWAP16(0 x0002))
dev->stats.rx_fifo_errors++;
if (rfd->stat & SWAP16(0 x0004))
dev->stats.rx_frame_errors++;
if (rfd->stat & SWAP16(0 x0008))
dev->stats.rx_crc_errors++;
if (rfd->stat & SWAP16(0 x0010))
dev->stats.rx_length_errors++;
}
/* Clear the buffer descriptor count and EOF + F flags */
if (rbd != NULL && (rbd->count & SWAP16(0 x4000))) {
rbd->count = 0 ;
lp->rbd_head = rbd->v_next;
dma_sync_dev(dev, rbd, sizeof (struct i596_rbd));
}
/* Tidy the frame descriptor, marking it as end of list */
rfd->rbd = I596_NULL;
rfd->stat = 0 ;
rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
rfd->count = 0 ;
/* Update record of next frame descriptor to process */
lp->dma->scb.rfd = rfd->b_next;
lp->rfd_head = rfd->v_next;
dma_sync_dev(dev, rfd, sizeof (struct i596_rfd));
/* Remove end-of-list from old end descriptor */
rfd->v_prev->cmd = SWAP16(CMD_FLEX);
dma_sync_dev(dev, rfd->v_prev, sizeof (struct i596_rfd));
rfd = lp->rfd_head;
dma_sync_cpu(dev, rfd, sizeof (struct i596_rfd));
}
DEB(DEB_RXFRAME, printk(KERN_DEBUG "frames %d\n" , frames));
return 0 ;
}
static inline void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
{
struct i596_cmd *ptr;
while (lp->cmd_head != NULL) {
ptr = lp->cmd_head;
lp->cmd_head = ptr->v_next;
lp->cmd_backlog--;
switch (SWAP16(ptr->command) & 0 x7) {
case CmdTx:
{
struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
struct sk_buff *skb = tx_cmd->skb;
dma_unmap_single(dev->dev.parent,
tx_cmd->dma_addr,
skb->len, DMA_TO_DEVICE);
dev_kfree_skb(skb);
dev->stats.tx_errors++;
dev->stats.tx_aborted_errors++;
ptr->v_next = NULL;
ptr->b_next = I596_NULL;
tx_cmd->cmd.command = 0 ; /* Mark as free */
break ;
}
default :
ptr->v_next = NULL;
ptr->b_next = I596_NULL;
}
dma_sync_dev(dev, ptr, sizeof (struct i596_cmd));
}
wait_cmd(dev, lp->dma, 100 , "i596_cleanup_cmd timed out" );
lp->dma->scb.cmd = I596_NULL;
dma_sync_dev(dev, &(lp->dma->scb), sizeof (struct i596_scb));
}
static inline void i596_reset(struct net_device *dev, struct i596_private *lp)
{
unsigned long flags;
DEB(DEB_RESET, printk(KERN_DEBUG "i596_reset\n" ));
spin_lock_irqsave (&lp->lock, flags);
wait_cmd(dev, lp->dma, 100 , "i596_reset timed out" );
netif_stop_queue(dev);
/* FIXME: this command might cause an lpmc */
lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
dma_sync_dev(dev, &(lp->dma->scb), sizeof (struct i596_scb));
ca(dev);
/* wait for shutdown */
wait_cmd(dev, lp->dma, 1000 , "i596_reset 2 timed out" );
spin_unlock_irqrestore (&lp->lock, flags);
i596_cleanup_cmd(dev, lp);
i596_rx(dev);
netif_start_queue(dev);
init_i596_mem(dev);
}
static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
{
struct i596_private *lp = netdev_priv(dev);
struct i596_dma *dma = lp->dma;
unsigned long flags;
DEB(DEB_ADDCMD, printk(KERN_DEBUG "i596_add_cmd cmd_head %p\n" ,
lp->cmd_head));
cmd->status = 0 ;
cmd->command |= SWAP16(CMD_EOL | CMD_INTR);
cmd->v_next = NULL;
cmd->b_next = I596_NULL;
dma_sync_dev(dev, cmd, sizeof (struct i596_cmd));
spin_lock_irqsave (&lp->lock, flags);
if (lp->cmd_head != NULL) {
lp->cmd_tail->v_next = cmd;
lp->cmd_tail->b_next = SWAP32(virt_to_dma(lp, &cmd->status));
dma_sync_dev(dev, lp->cmd_tail, sizeof (struct i596_cmd));
} else {
lp->cmd_head = cmd;
wait_cmd(dev, dma, 100 , "i596_add_cmd timed out" );
dma->scb.cmd = SWAP32(virt_to_dma(lp, &cmd->status));
dma->scb.command = SWAP16(CUC_START);
dma_sync_dev(dev, &(dma->scb), sizeof (struct i596_scb));
ca(dev);
}
lp->cmd_tail = cmd;
lp->cmd_backlog++;
spin_unlock_irqrestore (&lp->lock, flags);
if (lp->cmd_backlog > max_cmd_backlog) {
unsigned long tickssofar = jiffies - lp->last_cmd;
if (tickssofar < ticks_limit)
return ;
printk(KERN_ERR
"%s: command unit timed out, status resetting.\n" ,
dev->name);
#if 1
i596_reset(dev, lp);
#endif
}
}
static int i596_open(struct net_device *dev)
{
DEB(DEB_OPEN, printk(KERN_DEBUG
"%s: i596_open() irq %d.\n" , dev->name, dev->irq));
if (init_rx_bufs(dev)) {
printk(KERN_ERR "%s: Failed to init rx bufs\n" , dev->name);
return -EAGAIN;
}
if (init_i596_mem(dev)) {
printk(KERN_ERR "%s: Failed to init memory\n" , dev->name);
goto out_remove_rx_bufs;
}
netif_start_queue(dev);
return 0 ;
out_remove_rx_bufs:
remove_rx_bufs(dev);
return -EAGAIN;
}
static void i596_tx_timeout (struct net_device *dev, unsigned int txqueue)
{
struct i596_private *lp = netdev_priv(dev);
/* Transmitter timeout, serious problems. */
DEB(DEB_ERRORS, printk(KERN_DEBUG
"%s: transmit timed out, status resetting.\n" ,
dev->name));
dev->stats.tx_errors++;
/* Try to restart the adaptor */
if (lp->last_restart == dev->stats.tx_packets) {
DEB(DEB_ERRORS, printk(KERN_DEBUG "Resetting board.\n" ));
/* Shutdown and restart */
i596_reset (dev, lp);
} else {
/* Issue a channel attention signal */
DEB(DEB_ERRORS, printk(KERN_DEBUG "Kicking board.\n" ));
lp->dma->scb.command = SWAP16(CUC_START | RX_START);
dma_sync_dev(dev, &(lp->dma->scb), sizeof (struct i596_scb));
ca (dev);
lp->last_restart = dev->stats.tx_packets;
}
netif_trans_update(dev); /* prevent tx timeout */
netif_wake_queue (dev);
}
static netdev_tx_t i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct i596_private *lp = netdev_priv(dev);
struct tx_cmd *tx_cmd;
struct i596_tbd *tbd;
short length = skb->len;
DEB(DEB_STARTTX, printk(KERN_DEBUG
"%s: i596_start_xmit(%x,%p) called\n" ,
dev->name, skb->len, skb->data));
if (length < ETH_ZLEN) {
if (skb_padto(skb, ETH_ZLEN))
return NETDEV_TX_OK;
length = ETH_ZLEN;
}
netif_stop_queue(dev);
tx_cmd = lp->dma->tx_cmds + lp->next_tx_cmd;
tbd = lp->dma->tbds + lp->next_tx_cmd;
if (tx_cmd->cmd.command) {
DEB(DEB_ERRORS, printk(KERN_DEBUG
"%s: xmit ring full, dropping packet.\n" ,
dev->name));
dev->stats.tx_dropped++;
dev_kfree_skb_any(skb);
} else {
if (++lp->next_tx_cmd == TX_RING_SIZE)
lp->next_tx_cmd = 0 ;
tx_cmd->tbd = SWAP32(virt_to_dma(lp, tbd));
tbd->next = I596_NULL;
tx_cmd->cmd.command = SWAP16(CMD_FLEX | CmdTx);
tx_cmd->skb = skb;
tx_cmd->pad = 0 ;
tx_cmd->size = 0 ;
tbd->pad = 0 ;
tbd->size = SWAP16(EOF | length);
tx_cmd->dma_addr = dma_map_single(dev->dev.parent, skb->data,
skb->len, DMA_TO_DEVICE);
tbd->data = SWAP32(tx_cmd->dma_addr);
DEB(DEB_TXADDR, print_eth(skb->data, "tx-queued" ));
dma_sync_dev(dev, tx_cmd, sizeof (struct tx_cmd));
dma_sync_dev(dev, tbd, sizeof (struct i596_tbd));
i596_add_cmd(dev, &tx_cmd->cmd);
dev->stats.tx_packets++;
dev->stats.tx_bytes += length;
}
netif_start_queue(dev);
return NETDEV_TX_OK;
}
static void print_eth(unsigned char *add, char *str)
{
printk(KERN_DEBUG "i596 0x%p, %pM --> %pM %02X%02X, %s\n" ,
add, add + 6 , add, add[12 ], add[13 ], str);
}
static const struct net_device_ops i596_netdev_ops = {
.ndo_open = i596_open,
.ndo_stop = i596_close,
.ndo_start_xmit = i596_start_xmit,
.ndo_set_rx_mode = set_multicast_list,
.ndo_tx_timeout = i596_tx_timeout,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = eth_mac_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = i596_poll_controller,
#endif
};
static int i82596_probe(struct net_device *dev)
{
struct i596_private *lp = netdev_priv(dev);
int ret;
/* This lot is ensure things have been cache line aligned. */
BUILD_BUG_ON(sizeof (struct i596_rfd) != 32 );
BUILD_BUG_ON(sizeof (struct i596_rbd) & 31 );
BUILD_BUG_ON(sizeof (struct tx_cmd) & 31 );
BUILD_BUG_ON(sizeof (struct i596_tbd) != 32 );
#ifndef __LP64__
BUILD_BUG_ON(sizeof (struct i596_dma) > 4096 );
#endif
if (!dev->base_addr || !dev->irq)
return -ENODEV;
dev->netdev_ops = &i596_netdev_ops;
dev->watchdog_timeo = TX_TIMEOUT;
memset(lp->dma, 0 , sizeof (struct i596_dma));
lp->dma->scb.command = 0 ;
lp->dma->scb.cmd = I596_NULL;
lp->dma->scb.rfd = I596_NULL;
spin_lock_init(&lp->lock);
dma_sync_dev(dev, lp->dma, sizeof (struct i596_dma));
ret = register_netdev(dev);
if (ret)
return ret;
DEB(DEB_PROBE, printk(KERN_INFO "%s: 82596 at %#3lx, %pM IRQ %d.\n" ,
dev->name, dev->base_addr, dev->dev_addr,
dev->irq));
DEB(DEB_INIT, printk(KERN_INFO
"%s: dma at 0x%p (%d bytes), lp->scb at 0x%p\n" ,
dev->name, lp->dma, (int )sizeof (struct i596_dma),
&lp->dma->scb));
return 0 ;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void i596_poll_controller(struct net_device *dev)
{
disable_irq(dev->irq);
i596_interrupt(dev->irq, dev);
enable_irq(dev->irq);
}
#endif
static irqreturn_t i596_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct i596_private *lp;
struct i596_dma *dma;
unsigned short status, ack_cmd = 0 ;
lp = netdev_priv(dev);
dma = lp->dma;
spin_lock (&lp->lock);
wait_cmd(dev, dma, 100 , "i596 interrupt, timeout" );
status = SWAP16(dma->scb.status);
DEB(DEB_INTS, printk(KERN_DEBUG
"%s: i596 interrupt, IRQ %d, status %4.4x.\n" ,
dev->name, dev->irq, status));
ack_cmd = status & 0 xf000;
if (!ack_cmd) {
DEB(DEB_ERRORS, printk(KERN_DEBUG
"%s: interrupt with no events\n" ,
dev->name));
spin_unlock (&lp->lock);
return IRQ_NONE;
}
if ((status & 0 x8000) || (status & 0 x2000)) {
struct i596_cmd *ptr;
if ((status & 0 x8000))
DEB(DEB_INTS,
printk(KERN_DEBUG
"%s: i596 interrupt completed command.\n" ,
dev->name));
if ((status & 0 x2000))
DEB(DEB_INTS,
printk(KERN_DEBUG
"%s: i596 interrupt command unit inactive %x.\n" ,
dev->name, status & 0 x0700));
while (lp->cmd_head != NULL) {
dma_sync_cpu(dev, lp->cmd_head, sizeof (struct i596_cmd));
if (!(lp->cmd_head->status & SWAP16(STAT_C)))
break ;
ptr = lp->cmd_head;
DEB(DEB_STATUS,
printk(KERN_DEBUG
"cmd_head->status = %04x, ->command = %04x\n" ,
SWAP16(lp->cmd_head->status),
SWAP16(lp->cmd_head->command)));
lp->cmd_head = ptr->v_next;
lp->cmd_backlog--;
switch (SWAP16(ptr->command) & 0 x7) {
case CmdTx:
{
struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
struct sk_buff *skb = tx_cmd->skb;
if (ptr->status & SWAP16(STAT_OK)) {
DEB(DEB_TXADDR,
print_eth(skb->data, "tx-done" ));
} else {
dev->stats.tx_errors++;
if (ptr->status & SWAP16(0 x0020))
dev->stats.collisions++;
if (!(ptr->status & SWAP16(0 x0040)))
dev->stats.tx_heartbeat_errors++;
if (ptr->status & SWAP16(0 x0400))
dev->stats.tx_carrier_errors++;
if (ptr->status & SWAP16(0 x0800))
dev->stats.collisions++;
if (ptr->status & SWAP16(0 x1000))
dev->stats.tx_aborted_errors++;
}
dma_unmap_single(dev->dev.parent,
tx_cmd->dma_addr,
skb->len, DMA_TO_DEVICE);
dev_consume_skb_irq(skb);
tx_cmd->cmd.command = 0 ; /* Mark free */
break ;
}
case CmdTDR:
{
unsigned short status = SWAP16(((struct tdr_cmd *)ptr)->status);
if (status & 0 x8000) {
DEB(DEB_ANY,
printk(KERN_DEBUG "%s: link ok.\n" ,
dev->name));
} else {
if (status & 0 x4000)
printk(KERN_ERR
"%s: Transceiver problem.\n" ,
dev->name);
if (status & 0 x2000)
printk(KERN_ERR
"%s: Termination problem.\n" ,
dev->name);
if (status & 0 x1000)
printk(KERN_ERR
"%s: Short circuit.\n" ,
dev->name);
DEB(DEB_TDR,
printk(KERN_DEBUG "%s: Time %d.\n" ,
dev->name, status & 0 x07ff));
}
break ;
}
case CmdConfigure:
/*
* Zap command so set_multicast_list ( ) know
* it is free
*/
ptr->command = 0 ;
break ;
}
ptr->v_next = NULL;
ptr->b_next = I596_NULL;
dma_sync_dev(dev, ptr, sizeof (struct i596_cmd));
lp->last_cmd = jiffies;
}
/* This mess is arranging that only the last of any outstanding
* commands has the interrupt bit set . Should probably really
* only add to the cmd queue when the CU is stopped .
*/
ptr = lp->cmd_head;
while ((ptr != NULL) && (ptr != lp->cmd_tail)) {
struct i596_cmd *prev = ptr;
ptr->command &= SWAP16(0 x1fff);
ptr = ptr->v_next;
dma_sync_dev(dev, prev, sizeof (struct i596_cmd));
}
if (lp->cmd_head != NULL)
ack_cmd |= CUC_START;
dma->scb.cmd = SWAP32(virt_to_dma(lp, &lp->cmd_head->status));
dma_sync_dev(dev, &dma->scb, sizeof (struct i596_scb));
}
if ((status & 0 x1000) || (status & 0 x4000)) {
if ((status & 0 x4000))
DEB(DEB_INTS,
printk(KERN_DEBUG
"%s: i596 interrupt received a frame.\n" ,
dev->name));
i596_rx(dev);
/* Only RX_START if stopped - RGH 07-07-96 */
if (status & 0 x1000) {
if (netif_running(dev)) {
DEB(DEB_ERRORS,
printk(KERN_DEBUG
"%s: i596 interrupt receive unit inactive, status 0x%x\n" ,
dev->name, status));
ack_cmd |= RX_START;
dev->stats.rx_errors++;
dev->stats.rx_fifo_errors++;
rebuild_rx_bufs(dev);
}
}
}
wait_cmd(dev, dma, 100 , "i596 interrupt, timeout" );
dma->scb.command = SWAP16(ack_cmd);
dma_sync_dev(dev, &dma->scb, sizeof (struct i596_scb));
/* DANGER: I suspect that some kind of interrupt
acknowledgement aside from acking the 82596 might be needed
here... but it's running acceptably without */
ca(dev);
wait_cmd(dev, dma, 100 , "i596 interrupt, exit timeout" );
DEB(DEB_INTS, printk(KERN_DEBUG "%s: exiting interrupt.\n" , dev->name));
spin_unlock (&lp->lock);
return IRQ_HANDLED;
}
static int i596_close(struct net_device *dev)
{
struct i596_private *lp = netdev_priv(dev);
unsigned long flags;
netif_stop_queue(dev);
DEB(DEB_INIT,
printk(KERN_DEBUG
"%s: Shutting down ethercard, status was %4.4x.\n" ,
dev->name, SWAP16(lp->dma->scb.status)));
spin_lock_irqsave(&lp->lock, flags);
wait_cmd(dev, lp->dma, 100 , "close1 timed out" );
lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
dma_sync_dev(dev, &lp->dma->scb, sizeof (struct i596_scb));
ca(dev);
wait_cmd(dev, lp->dma, 100 , "close2 timed out" );
spin_unlock_irqrestore(&lp->lock, flags);
DEB(DEB_STRUCT, i596_display_data(dev));
i596_cleanup_cmd(dev, lp);
free_irq(dev->irq, dev);
remove_rx_bufs(dev);
return 0 ;
}
/*
* Set or clear the multicast filter for this adaptor .
*/
static void set_multicast_list(struct net_device *dev)
{
struct i596_private *lp = netdev_priv(dev);
struct i596_dma *dma = lp->dma;
int config = 0 , cnt;
DEB(DEB_MULTI,
printk(KERN_DEBUG
"%s: set multicast list, %d entries, promisc %s, allmulti %s\n" ,
dev->name, netdev_mc_count(dev),
dev->flags & IFF_PROMISC ? "ON" : "OFF" ,
dev->flags & IFF_ALLMULTI ? "ON" : "OFF" ));
if ((dev->flags & IFF_PROMISC) &&
!(dma->cf_cmd.i596_config[8 ] & 0 x01)) {
dma->cf_cmd.i596_config[8 ] |= 0 x01;
config = 1 ;
}
if (!(dev->flags & IFF_PROMISC) &&
(dma->cf_cmd.i596_config[8 ] & 0 x01)) {
dma->cf_cmd.i596_config[8 ] &= ~0 x01;
config = 1 ;
}
if ((dev->flags & IFF_ALLMULTI) &&
(dma->cf_cmd.i596_config[11 ] & 0 x20)) {
dma->cf_cmd.i596_config[11 ] &= ~0 x20;
config = 1 ;
}
if (!(dev->flags & IFF_ALLMULTI) &&
!(dma->cf_cmd.i596_config[11 ] & 0 x20)) {
dma->cf_cmd.i596_config[11 ] |= 0 x20;
config = 1 ;
}
if (config) {
if (dma->cf_cmd.cmd.command)
printk(KERN_INFO
"%s: config change request already queued\n" ,
dev->name);
else {
dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
dma_sync_dev(dev, &dma->cf_cmd, sizeof (struct cf_cmd));
i596_add_cmd(dev, &dma->cf_cmd.cmd);
}
}
cnt = netdev_mc_count(dev);
if (cnt > MAX_MC_CNT) {
cnt = MAX_MC_CNT;
printk(KERN_NOTICE "%s: Only %d multicast addresses supported" ,
dev->name, cnt);
}
if (!netdev_mc_empty(dev)) {
struct netdev_hw_addr *ha;
unsigned char *cp;
struct mc_cmd *cmd;
cmd = &dma->mc_cmd;
cmd->cmd.command = SWAP16(CmdMulticastList);
cmd->mc_cnt = SWAP16(netdev_mc_count(dev) * 6 );
cp = cmd->mc_addrs;
netdev_for_each_mc_addr(ha, dev) {
if (!cnt--)
break ;
memcpy(cp, ha->addr, ETH_ALEN);
if (i596_debug > 1 )
DEB(DEB_MULTI,
printk(KERN_DEBUG
"%s: Adding address %pM\n" ,
dev->name, cp));
cp += ETH_ALEN;
}
dma_sync_dev(dev, &dma->mc_cmd, sizeof (struct mc_cmd));
i596_add_cmd(dev, &cmd->cmd);
}
}
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(vorverarbeitet am 2026-09-27)
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