/*
|
* Linux ARCnet driver - device-independent routines
|
*
|
* Written 1997 by David Woodhouse.
|
* Written 1994-1999 by Avery Pennarun.
|
* Written 1999-2000 by Martin Mares <mj@ucw.cz>.
|
* Derived from skeleton.c by Donald Becker.
|
*
|
* Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
|
* for sponsoring the further development of this driver.
|
*
|
* **********************
|
*
|
* The original copyright was as follows:
|
*
|
* skeleton.c Written 1993 by Donald Becker.
|
* Copyright 1993 United States Government as represented by the
|
* Director, National Security Agency. This software may only be used
|
* and distributed according to the terms of the GNU General Public License as
|
* modified by SRC, incorporated herein by reference.
|
*
|
* **********************
|
*
|
* The change log is now in a file called ChangeLog in this directory.
|
*
|
* Sources:
|
* - Crynwr arcnet.com/arcether.com packet drivers.
|
* - arcnet.c v0.00 dated 1/1/94 and apparently by
|
* Donald Becker - it didn't work :)
|
* - skeleton.c v0.05 dated 11/16/93 by Donald Becker
|
* (from Linux Kernel 1.1.45)
|
* - RFC's 1201 and 1051 - re: TCP/IP over ARCnet
|
* - The official ARCnet COM9026 data sheets (!) thanks to
|
* Ken Cornetet <kcornete@nyx10.cs.du.edu>
|
* - The official ARCnet COM20020 data sheets.
|
* - Information on some more obscure ARCnet controller chips, thanks
|
* to the nice people at SMSC.
|
* - net/inet/eth.c (from kernel 1.1.50) for header-building info.
|
* - Alternate Linux ARCnet source by V.Shergin <vsher@sao.stavropol.su>
|
* - Textual information and more alternate source from Joachim Koenig
|
* <jojo@repas.de>
|
*/
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
#include <linux/module.h>
|
#include <linux/types.h>
|
#include <linux/delay.h>
|
#include <linux/netdevice.h>
|
#include <linux/if_arp.h>
|
#include <net/arp.h>
|
#include <linux/init.h>
|
#include <linux/jiffies.h>
|
#include <linux/errqueue.h>
|
|
#include <linux/leds.h>
|
|
#include "arcdevice.h"
|
#include "com9026.h"
|
|
/* "do nothing" functions for protocol drivers */
|
static void null_rx(struct net_device *dev, int bufnum,
|
struct archdr *pkthdr, int length);
|
static int null_build_header(struct sk_buff *skb, struct net_device *dev,
|
unsigned short type, uint8_t daddr);
|
static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
|
int length, int bufnum);
|
|
static void arcnet_rx(struct net_device *dev, int bufnum);
|
|
/* one ArcProto per possible proto ID. None of the elements of
|
* arc_proto_map are allowed to be NULL; they will get set to
|
* arc_proto_default instead. It also must not be NULL; if you would like
|
* to set it to NULL, set it to &arc_proto_null instead.
|
*/
|
struct ArcProto *arc_proto_map[256];
|
EXPORT_SYMBOL(arc_proto_map);
|
|
struct ArcProto *arc_proto_default;
|
EXPORT_SYMBOL(arc_proto_default);
|
|
struct ArcProto *arc_bcast_proto;
|
EXPORT_SYMBOL(arc_bcast_proto);
|
|
struct ArcProto *arc_raw_proto;
|
EXPORT_SYMBOL(arc_raw_proto);
|
|
static struct ArcProto arc_proto_null = {
|
.suffix = '?',
|
.mtu = XMTU,
|
.is_ip = 0,
|
.rx = null_rx,
|
.build_header = null_build_header,
|
.prepare_tx = null_prepare_tx,
|
.continue_tx = NULL,
|
.ack_tx = NULL
|
};
|
|
/* Exported function prototypes */
|
int arcnet_debug = ARCNET_DEBUG;
|
EXPORT_SYMBOL(arcnet_debug);
|
|
/* Internal function prototypes */
|
static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
|
unsigned short type, const void *daddr,
|
const void *saddr, unsigned len);
|
static int go_tx(struct net_device *dev);
|
|
static int debug = ARCNET_DEBUG;
|
module_param(debug, int, 0);
|
MODULE_LICENSE("GPL");
|
|
static int __init arcnet_init(void)
|
{
|
int count;
|
|
arcnet_debug = debug;
|
|
pr_info("arcnet loaded\n");
|
|
/* initialize the protocol map */
|
arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
|
for (count = 0; count < 256; count++)
|
arc_proto_map[count] = arc_proto_default;
|
|
if (BUGLVL(D_DURING))
|
pr_info("struct sizes: %zd %zd %zd %zd %zd\n",
|
sizeof(struct arc_hardware),
|
sizeof(struct arc_rfc1201),
|
sizeof(struct arc_rfc1051),
|
sizeof(struct arc_eth_encap),
|
sizeof(struct archdr));
|
|
return 0;
|
}
|
|
static void __exit arcnet_exit(void)
|
{
|
}
|
|
module_init(arcnet_init);
|
module_exit(arcnet_exit);
|
|
/* Dump the contents of an sk_buff */
|
#if ARCNET_DEBUG_MAX & D_SKB
|
void arcnet_dump_skb(struct net_device *dev,
|
struct sk_buff *skb, char *desc)
|
{
|
char hdr[32];
|
|
/* dump the packet */
|
snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);
|
print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
|
16, 1, skb->data, skb->len, true);
|
}
|
EXPORT_SYMBOL(arcnet_dump_skb);
|
#endif
|
|
/* Dump the contents of an ARCnet buffer */
|
#if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
|
static void arcnet_dump_packet(struct net_device *dev, int bufnum,
|
char *desc, int take_arcnet_lock)
|
{
|
struct arcnet_local *lp = netdev_priv(dev);
|
int i, length;
|
unsigned long flags = 0;
|
static uint8_t buf[512];
|
char hdr[32];
|
|
/* hw.copy_from_card expects IRQ context so take the IRQ lock
|
* to keep it single threaded
|
*/
|
if (take_arcnet_lock)
|
spin_lock_irqsave(&lp->lock, flags);
|
|
lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
|
if (take_arcnet_lock)
|
spin_unlock_irqrestore(&lp->lock, flags);
|
|
/* if the offset[0] byte is nonzero, this is a 256-byte packet */
|
length = (buf[2] ? 256 : 512);
|
|
/* dump the packet */
|
snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);
|
print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
|
16, 1, buf, length, true);
|
}
|
|
#else
|
|
#define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) do { } while (0)
|
|
#endif
|
|
/* Trigger a LED event in response to a ARCNET device event */
|
void arcnet_led_event(struct net_device *dev, enum arcnet_led_event event)
|
{
|
struct arcnet_local *lp = netdev_priv(dev);
|
unsigned long led_delay = 350;
|
unsigned long tx_delay = 50;
|
|
switch (event) {
|
case ARCNET_LED_EVENT_RECON:
|
led_trigger_blink_oneshot(lp->recon_led_trig,
|
&led_delay, &led_delay, 0);
|
break;
|
case ARCNET_LED_EVENT_OPEN:
|
led_trigger_event(lp->tx_led_trig, LED_OFF);
|
led_trigger_event(lp->recon_led_trig, LED_OFF);
|
break;
|
case ARCNET_LED_EVENT_STOP:
|
led_trigger_event(lp->tx_led_trig, LED_OFF);
|
led_trigger_event(lp->recon_led_trig, LED_OFF);
|
break;
|
case ARCNET_LED_EVENT_TX:
|
led_trigger_blink_oneshot(lp->tx_led_trig,
|
&tx_delay, &tx_delay, 0);
|
break;
|
}
|
}
|
EXPORT_SYMBOL_GPL(arcnet_led_event);
|
|
static void arcnet_led_release(struct device *gendev, void *res)
|
{
|
struct arcnet_local *lp = netdev_priv(to_net_dev(gendev));
|
|
led_trigger_unregister_simple(lp->tx_led_trig);
|
led_trigger_unregister_simple(lp->recon_led_trig);
|
}
|
|
/* Register ARCNET LED triggers for a arcnet device
|
*
|
* This is normally called from a driver's probe function
|
*/
|
void devm_arcnet_led_init(struct net_device *netdev, int index, int subid)
|
{
|
struct arcnet_local *lp = netdev_priv(netdev);
|
void *res;
|
|
res = devres_alloc(arcnet_led_release, 0, GFP_KERNEL);
|
if (!res) {
|
netdev_err(netdev, "cannot register LED triggers\n");
|
return;
|
}
|
|
snprintf(lp->tx_led_trig_name, sizeof(lp->tx_led_trig_name),
|
"arc%d-%d-tx", index, subid);
|
snprintf(lp->recon_led_trig_name, sizeof(lp->recon_led_trig_name),
|
"arc%d-%d-recon", index, subid);
|
|
led_trigger_register_simple(lp->tx_led_trig_name,
|
&lp->tx_led_trig);
|
led_trigger_register_simple(lp->recon_led_trig_name,
|
&lp->recon_led_trig);
|
|
devres_add(&netdev->dev, res);
|
}
|
EXPORT_SYMBOL_GPL(devm_arcnet_led_init);
|
|
/* Unregister a protocol driver from the arc_proto_map. Protocol drivers
|
* are responsible for registering themselves, but the unregister routine
|
* is pretty generic so we'll do it here.
|
*/
|
void arcnet_unregister_proto(struct ArcProto *proto)
|
{
|
int count;
|
|
if (arc_proto_default == proto)
|
arc_proto_default = &arc_proto_null;
|
if (arc_bcast_proto == proto)
|
arc_bcast_proto = arc_proto_default;
|
if (arc_raw_proto == proto)
|
arc_raw_proto = arc_proto_default;
|
|
for (count = 0; count < 256; count++) {
|
if (arc_proto_map[count] == proto)
|
arc_proto_map[count] = arc_proto_default;
|
}
|
}
|
EXPORT_SYMBOL(arcnet_unregister_proto);
|
|
/* Add a buffer to the queue. Only the interrupt handler is allowed to do
|
* this, unless interrupts are disabled.
|
*
|
* Note: we don't check for a full queue, since there aren't enough buffers
|
* to more than fill it.
|
*/
|
static void release_arcbuf(struct net_device *dev, int bufnum)
|
{
|
struct arcnet_local *lp = netdev_priv(dev);
|
int i;
|
|
lp->buf_queue[lp->first_free_buf++] = bufnum;
|
lp->first_free_buf %= 5;
|
|
if (BUGLVL(D_DURING)) {
|
arc_printk(D_DURING, dev, "release_arcbuf: freed #%d; buffer queue is now: ",
|
bufnum);
|
for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)
|
arc_cont(D_DURING, "#%d ", lp->buf_queue[i]);
|
arc_cont(D_DURING, "\n");
|
}
|
}
|
|
/* Get a buffer from the queue.
|
* If this returns -1, there are no buffers available.
|
*/
|
static int get_arcbuf(struct net_device *dev)
|
{
|
struct arcnet_local *lp = netdev_priv(dev);
|
int buf = -1, i;
|
|
if (!atomic_dec_and_test(&lp->buf_lock)) {
|
/* already in this function */
|
arc_printk(D_NORMAL, dev, "get_arcbuf: overlap (%d)!\n",
|
lp->buf_lock.counter);
|
} else { /* we can continue */
|
if (lp->next_buf >= 5)
|
lp->next_buf -= 5;
|
|
if (lp->next_buf == lp->first_free_buf) {
|
arc_printk(D_NORMAL, dev, "get_arcbuf: BUG: no buffers are available??\n");
|
} else {
|
buf = lp->buf_queue[lp->next_buf++];
|
lp->next_buf %= 5;
|
}
|
}
|
|
if (BUGLVL(D_DURING)) {
|
arc_printk(D_DURING, dev, "get_arcbuf: got #%d; buffer queue is now: ",
|
buf);
|
for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)
|
arc_cont(D_DURING, "#%d ", lp->buf_queue[i]);
|
arc_cont(D_DURING, "\n");
|
}
|
|
atomic_inc(&lp->buf_lock);
|
return buf;
|
}
|
|
static int choose_mtu(void)
|
{
|
int count, mtu = 65535;
|
|
/* choose the smallest MTU of all available encaps */
|
for (count = 0; count < 256; count++) {
|
if (arc_proto_map[count] != &arc_proto_null &&
|
arc_proto_map[count]->mtu < mtu) {
|
mtu = arc_proto_map[count]->mtu;
|
}
|
}
|
|
return mtu == 65535 ? XMTU : mtu;
|
}
|
|
static const struct header_ops arcnet_header_ops = {
|
.create = arcnet_header,
|
};
|
|
static const struct net_device_ops arcnet_netdev_ops = {
|
.ndo_open = arcnet_open,
|
.ndo_stop = arcnet_close,
|
.ndo_start_xmit = arcnet_send_packet,
|
.ndo_tx_timeout = arcnet_timeout,
|
};
|
|
/* Setup a struct device for ARCnet. */
|
static void arcdev_setup(struct net_device *dev)
|
{
|
dev->type = ARPHRD_ARCNET;
|
dev->netdev_ops = &arcnet_netdev_ops;
|
dev->header_ops = &arcnet_header_ops;
|
dev->hard_header_len = sizeof(struct arc_hardware);
|
dev->mtu = choose_mtu();
|
|
dev->addr_len = ARCNET_ALEN;
|
dev->tx_queue_len = 100;
|
dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */
|
dev->watchdog_timeo = TX_TIMEOUT;
|
|
/* New-style flags. */
|
dev->flags = IFF_BROADCAST;
|
}
|
|
static void arcnet_timer(struct timer_list *t)
|
{
|
struct arcnet_local *lp = from_timer(lp, t, timer);
|
struct net_device *dev = lp->dev;
|
|
if (!netif_carrier_ok(dev)) {
|
netif_carrier_on(dev);
|
netdev_info(dev, "link up\n");
|
}
|
}
|
|
static void arcnet_reply_tasklet(unsigned long data)
|
{
|
struct arcnet_local *lp = (struct arcnet_local *)data;
|
|
struct sk_buff *ackskb, *skb;
|
struct sock_exterr_skb *serr;
|
struct sock *sk;
|
int ret;
|
|
local_irq_disable();
|
skb = lp->outgoing.skb;
|
if (!skb || !skb->sk) {
|
local_irq_enable();
|
return;
|
}
|
|
sock_hold(skb->sk);
|
sk = skb->sk;
|
ackskb = skb_clone_sk(skb);
|
sock_put(skb->sk);
|
|
if (!ackskb) {
|
local_irq_enable();
|
return;
|
}
|
|
serr = SKB_EXT_ERR(ackskb);
|
memset(serr, 0, sizeof(*serr));
|
serr->ee.ee_errno = ENOMSG;
|
serr->ee.ee_origin = SO_EE_ORIGIN_TXSTATUS;
|
serr->ee.ee_data = skb_shinfo(skb)->tskey;
|
serr->ee.ee_info = lp->reply_status;
|
|
/* finally erasing outgoing skb */
|
dev_kfree_skb(lp->outgoing.skb);
|
lp->outgoing.skb = NULL;
|
|
ackskb->dev = lp->dev;
|
|
ret = sock_queue_err_skb(sk, ackskb);
|
if (ret)
|
kfree_skb(ackskb);
|
|
local_irq_enable();
|
};
|
|
struct net_device *alloc_arcdev(const char *name)
|
{
|
struct net_device *dev;
|
|
dev = alloc_netdev(sizeof(struct arcnet_local),
|
name && *name ? name : "arc%d", NET_NAME_UNKNOWN,
|
arcdev_setup);
|
if (dev) {
|
struct arcnet_local *lp = netdev_priv(dev);
|
|
lp->dev = dev;
|
spin_lock_init(&lp->lock);
|
timer_setup(&lp->timer, arcnet_timer, 0);
|
}
|
|
return dev;
|
}
|
EXPORT_SYMBOL(alloc_arcdev);
|
|
/* Open/initialize the board. This is called 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.
|
*/
|
int arcnet_open(struct net_device *dev)
|
{
|
struct arcnet_local *lp = netdev_priv(dev);
|
int count, newmtu, error;
|
|
arc_printk(D_INIT, dev, "opened.");
|
|
if (!try_module_get(lp->hw.owner))
|
return -ENODEV;
|
|
if (BUGLVL(D_PROTO)) {
|
arc_printk(D_PROTO, dev, "protocol map (default is '%c'): ",
|
arc_proto_default->suffix);
|
for (count = 0; count < 256; count++)
|
arc_cont(D_PROTO, "%c", arc_proto_map[count]->suffix);
|
arc_cont(D_PROTO, "\n");
|
}
|
|
tasklet_init(&lp->reply_tasklet, arcnet_reply_tasklet,
|
(unsigned long)lp);
|
|
arc_printk(D_INIT, dev, "arcnet_open: resetting card.\n");
|
|
/* try to put the card in a defined state - if it fails the first
|
* time, actually reset it.
|
*/
|
error = -ENODEV;
|
if (lp->hw.reset(dev, 0) && lp->hw.reset(dev, 1))
|
goto out_module_put;
|
|
newmtu = choose_mtu();
|
if (newmtu < dev->mtu)
|
dev->mtu = newmtu;
|
|
arc_printk(D_INIT, dev, "arcnet_open: mtu: %d.\n", dev->mtu);
|
|
/* autodetect the encapsulation for each host. */
|
memset(lp->default_proto, 0, sizeof(lp->default_proto));
|
|
/* the broadcast address is special - use the 'bcast' protocol */
|
for (count = 0; count < 256; count++) {
|
if (arc_proto_map[count] == arc_bcast_proto) {
|
lp->default_proto[0] = count;
|
break;
|
}
|
}
|
|
/* initialize buffers */
|
atomic_set(&lp->buf_lock, 1);
|
|
lp->next_buf = lp->first_free_buf = 0;
|
release_arcbuf(dev, 0);
|
release_arcbuf(dev, 1);
|
release_arcbuf(dev, 2);
|
release_arcbuf(dev, 3);
|
lp->cur_tx = lp->next_tx = -1;
|
lp->cur_rx = -1;
|
|
lp->rfc1201.sequence = 1;
|
|
/* bring up the hardware driver */
|
if (lp->hw.open)
|
lp->hw.open(dev);
|
|
if (dev->dev_addr[0] == 0)
|
arc_printk(D_NORMAL, dev, "WARNING! Station address 00 is reserved for broadcasts!\n");
|
else if (dev->dev_addr[0] == 255)
|
arc_printk(D_NORMAL, dev, "WARNING! Station address FF may confuse DOS networking programs!\n");
|
|
arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
|
if (lp->hw.status(dev) & RESETflag) {
|
arc_printk(D_DEBUG, dev, "%s: %d: %s\n",
|
__FILE__, __LINE__, __func__);
|
lp->hw.command(dev, CFLAGScmd | RESETclear);
|
}
|
|
arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
|
/* make sure we're ready to receive IRQ's. */
|
lp->hw.intmask(dev, 0);
|
udelay(1); /* give it time to set the mask before
|
* we reset it again. (may not even be
|
* necessary)
|
*/
|
arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
|
lp->intmask = NORXflag | RECONflag;
|
lp->hw.intmask(dev, lp->intmask);
|
arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
|
|
netif_carrier_off(dev);
|
netif_start_queue(dev);
|
mod_timer(&lp->timer, jiffies + msecs_to_jiffies(1000));
|
|
arcnet_led_event(dev, ARCNET_LED_EVENT_OPEN);
|
return 0;
|
|
out_module_put:
|
module_put(lp->hw.owner);
|
return error;
|
}
|
EXPORT_SYMBOL(arcnet_open);
|
|
/* The inverse routine to arcnet_open - shuts down the card. */
|
int arcnet_close(struct net_device *dev)
|
{
|
struct arcnet_local *lp = netdev_priv(dev);
|
|
arcnet_led_event(dev, ARCNET_LED_EVENT_STOP);
|
del_timer_sync(&lp->timer);
|
|
netif_stop_queue(dev);
|
netif_carrier_off(dev);
|
|
tasklet_kill(&lp->reply_tasklet);
|
|
/* flush TX and disable RX */
|
lp->hw.intmask(dev, 0);
|
lp->hw.command(dev, NOTXcmd); /* stop transmit */
|
lp->hw.command(dev, NORXcmd); /* disable receive */
|
mdelay(1);
|
|
/* shut down the card */
|
lp->hw.close(dev);
|
module_put(lp->hw.owner);
|
return 0;
|
}
|
EXPORT_SYMBOL(arcnet_close);
|
|
static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
|
unsigned short type, const void *daddr,
|
const void *saddr, unsigned len)
|
{
|
const struct arcnet_local *lp = netdev_priv(dev);
|
uint8_t _daddr, proto_num;
|
struct ArcProto *proto;
|
|
arc_printk(D_DURING, dev,
|
"create header from %d to %d; protocol %d (%Xh); size %u.\n",
|
saddr ? *(uint8_t *)saddr : -1,
|
daddr ? *(uint8_t *)daddr : -1,
|
type, type, len);
|
|
if (skb->len != 0 && len != skb->len)
|
arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
|
skb->len, len);
|
|
/* Type is host order - ? */
|
if (type == ETH_P_ARCNET) {
|
proto = arc_raw_proto;
|
arc_printk(D_DEBUG, dev, "arc_raw_proto used. proto='%c'\n",
|
proto->suffix);
|
_daddr = daddr ? *(uint8_t *)daddr : 0;
|
} else if (!daddr) {
|
/* if the dest addr isn't provided, we can't choose an
|
* encapsulation! Store the packet type (eg. ETH_P_IP)
|
* for now, and we'll push on a real header when we do
|
* rebuild_header.
|
*/
|
*(uint16_t *)skb_push(skb, 2) = type;
|
/* XXX: Why not use skb->mac_len? */
|
if (skb->network_header - skb->mac_header != 2)
|
arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! diff (%u) is not 2!\n",
|
skb->network_header - skb->mac_header);
|
return -2; /* return error -- can't transmit yet! */
|
} else {
|
/* otherwise, we can just add the header as usual. */
|
_daddr = *(uint8_t *)daddr;
|
proto_num = lp->default_proto[_daddr];
|
proto = arc_proto_map[proto_num];
|
arc_printk(D_DURING, dev, "building header for %02Xh using protocol '%c'\n",
|
proto_num, proto->suffix);
|
if (proto == &arc_proto_null && arc_bcast_proto != proto) {
|
arc_printk(D_DURING, dev, "actually, let's use '%c' instead.\n",
|
arc_bcast_proto->suffix);
|
proto = arc_bcast_proto;
|
}
|
}
|
return proto->build_header(skb, dev, type, _daddr);
|
}
|
|
/* Called by the kernel in order to transmit a packet. */
|
netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
|
struct net_device *dev)
|
{
|
struct arcnet_local *lp = netdev_priv(dev);
|
struct archdr *pkt;
|
struct arc_rfc1201 *soft;
|
struct ArcProto *proto;
|
int txbuf;
|
unsigned long flags;
|
int retval;
|
|
arc_printk(D_DURING, dev,
|
"transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
|
lp->hw.status(dev), lp->cur_tx, lp->next_tx, skb->len, skb->protocol);
|
|
pkt = (struct archdr *)skb->data;
|
soft = &pkt->soft.rfc1201;
|
proto = arc_proto_map[soft->proto];
|
|
arc_printk(D_SKB_SIZE, dev, "skb: transmitting %d bytes to %02X\n",
|
skb->len, pkt->hard.dest);
|
if (BUGLVL(D_SKB))
|
arcnet_dump_skb(dev, skb, "tx");
|
|
/* fits in one packet? */
|
if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
|
arc_printk(D_NORMAL, dev, "fixme: packet too large: compensating badly!\n");
|
dev_kfree_skb(skb);
|
return NETDEV_TX_OK; /* don't try again */
|
}
|
|
/* We're busy transmitting a packet... */
|
netif_stop_queue(dev);
|
|
spin_lock_irqsave(&lp->lock, flags);
|
lp->hw.intmask(dev, 0);
|
if (lp->next_tx == -1)
|
txbuf = get_arcbuf(dev);
|
else
|
txbuf = -1;
|
|
if (txbuf != -1) {
|
lp->outgoing.skb = skb;
|
if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
|
!proto->ack_tx) {
|
/* done right away and we don't want to acknowledge
|
* the package later - forget about it now
|
*/
|
dev->stats.tx_bytes += skb->len;
|
} else {
|
/* do it the 'split' way */
|
lp->outgoing.proto = proto;
|
lp->outgoing.skb = skb;
|
lp->outgoing.pkt = pkt;
|
|
if (proto->continue_tx &&
|
proto->continue_tx(dev, txbuf)) {
|
arc_printk(D_NORMAL, dev,
|
"bug! continue_tx finished the first time! (proto='%c')\n",
|
proto->suffix);
|
}
|
}
|
retval = NETDEV_TX_OK;
|
lp->next_tx = txbuf;
|
} else {
|
retval = NETDEV_TX_BUSY;
|
}
|
|
arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n",
|
__FILE__, __LINE__, __func__, lp->hw.status(dev));
|
/* make sure we didn't ignore a TX IRQ while we were in here */
|
lp->hw.intmask(dev, 0);
|
|
arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
|
lp->intmask |= TXFREEflag | EXCNAKflag;
|
lp->hw.intmask(dev, lp->intmask);
|
arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n",
|
__FILE__, __LINE__, __func__, lp->hw.status(dev));
|
|
arcnet_led_event(dev, ARCNET_LED_EVENT_TX);
|
|
spin_unlock_irqrestore(&lp->lock, flags);
|
return retval; /* no need to try again */
|
}
|
EXPORT_SYMBOL(arcnet_send_packet);
|
|
/* Actually start transmitting a packet that was loaded into a buffer
|
* by prepare_tx. This should _only_ be called by the interrupt handler.
|
*/
|
static int go_tx(struct net_device *dev)
|
{
|
struct arcnet_local *lp = netdev_priv(dev);
|
|
arc_printk(D_DURING, dev, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
|
lp->hw.status(dev), lp->intmask, lp->next_tx, lp->cur_tx);
|
|
if (lp->cur_tx != -1 || lp->next_tx == -1)
|
return 0;
|
|
if (BUGLVL(D_TX))
|
arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
|
|
lp->cur_tx = lp->next_tx;
|
lp->next_tx = -1;
|
|
/* start sending */
|
lp->hw.command(dev, TXcmd | (lp->cur_tx << 3));
|
|
dev->stats.tx_packets++;
|
lp->lasttrans_dest = lp->lastload_dest;
|
lp->lastload_dest = 0;
|
lp->excnak_pending = 0;
|
lp->intmask |= TXFREEflag | EXCNAKflag;
|
|
return 1;
|
}
|
|
/* Called by the kernel when transmit times out */
|
void arcnet_timeout(struct net_device *dev)
|
{
|
unsigned long flags;
|
struct arcnet_local *lp = netdev_priv(dev);
|
int status = lp->hw.status(dev);
|
char *msg;
|
|
spin_lock_irqsave(&lp->lock, flags);
|
if (status & TXFREEflag) { /* transmit _DID_ finish */
|
msg = " - missed IRQ?";
|
} else {
|
msg = "";
|
dev->stats.tx_aborted_errors++;
|
lp->timed_out = 1;
|
lp->hw.command(dev, NOTXcmd | (lp->cur_tx << 3));
|
}
|
dev->stats.tx_errors++;
|
|
/* make sure we didn't miss a TX or a EXC NAK IRQ */
|
lp->hw.intmask(dev, 0);
|
lp->intmask |= TXFREEflag | EXCNAKflag;
|
lp->hw.intmask(dev, lp->intmask);
|
|
spin_unlock_irqrestore(&lp->lock, flags);
|
|
if (time_after(jiffies, lp->last_timeout + 10 * HZ)) {
|
arc_printk(D_EXTRA, dev, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
|
msg, status, lp->intmask, lp->lasttrans_dest);
|
lp->last_timeout = jiffies;
|
}
|
|
if (lp->cur_tx == -1)
|
netif_wake_queue(dev);
|
}
|
EXPORT_SYMBOL(arcnet_timeout);
|
|
/* The typical workload of the driver: Handle the network interface
|
* interrupts. Establish which device needs attention, and call the correct
|
* chipset interrupt handler.
|
*/
|
irqreturn_t arcnet_interrupt(int irq, void *dev_id)
|
{
|
struct net_device *dev = dev_id;
|
struct arcnet_local *lp;
|
int recbuf, status, diagstatus, didsomething, boguscount;
|
unsigned long flags;
|
int retval = IRQ_NONE;
|
|
arc_printk(D_DURING, dev, "\n");
|
|
arc_printk(D_DURING, dev, "in arcnet_interrupt\n");
|
|
lp = netdev_priv(dev);
|
BUG_ON(!lp);
|
|
spin_lock_irqsave(&lp->lock, flags);
|
|
/* RESET flag was enabled - if device is not running, we must
|
* clear it right away (but nothing else).
|
*/
|
if (!netif_running(dev)) {
|
if (lp->hw.status(dev) & RESETflag)
|
lp->hw.command(dev, CFLAGScmd | RESETclear);
|
lp->hw.intmask(dev, 0);
|
spin_unlock_irqrestore(&lp->lock, flags);
|
return retval;
|
}
|
|
arc_printk(D_DURING, dev, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
|
lp->hw.status(dev), lp->intmask);
|
|
boguscount = 5;
|
do {
|
status = lp->hw.status(dev);
|
diagstatus = (status >> 8) & 0xFF;
|
|
arc_printk(D_DEBUG, dev, "%s: %d: %s: status=%x\n",
|
__FILE__, __LINE__, __func__, status);
|
didsomething = 0;
|
|
/* RESET flag was enabled - card is resetting and if RX is
|
* disabled, it's NOT because we just got a packet.
|
*
|
* The card is in an undefined state.
|
* Clear it out and start over.
|
*/
|
if (status & RESETflag) {
|
arc_printk(D_NORMAL, dev, "spurious reset (status=%Xh)\n",
|
status);
|
arcnet_close(dev);
|
arcnet_open(dev);
|
|
/* get out of the interrupt handler! */
|
break;
|
}
|
/* RX is inhibited - we must have received something.
|
* Prepare to receive into the next buffer.
|
*
|
* We don't actually copy the received packet from the card
|
* until after the transmit handler runs (and possibly
|
* launches the next tx); this should improve latency slightly
|
* if we get both types of interrupts at once.
|
*/
|
recbuf = -1;
|
if (status & lp->intmask & NORXflag) {
|
recbuf = lp->cur_rx;
|
arc_printk(D_DURING, dev, "Buffer #%d: receive irq (status=%Xh)\n",
|
recbuf, status);
|
|
lp->cur_rx = get_arcbuf(dev);
|
if (lp->cur_rx != -1) {
|
arc_printk(D_DURING, dev, "enabling receive to buffer #%d\n",
|
lp->cur_rx);
|
lp->hw.command(dev, RXcmd | (lp->cur_rx << 3) | RXbcasts);
|
}
|
didsomething++;
|
}
|
|
if ((diagstatus & EXCNAKflag)) {
|
arc_printk(D_DURING, dev, "EXCNAK IRQ (diagstat=%Xh)\n",
|
diagstatus);
|
|
lp->hw.command(dev, NOTXcmd); /* disable transmit */
|
lp->excnak_pending = 1;
|
|
lp->hw.command(dev, EXCNAKclear);
|
lp->intmask &= ~(EXCNAKflag);
|
didsomething++;
|
}
|
|
/* a transmit finished, and we're interested in it. */
|
if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
|
int ackstatus;
|
lp->intmask &= ~(TXFREEflag | EXCNAKflag);
|
|
if (status & TXACKflag)
|
ackstatus = 2;
|
else if (lp->excnak_pending)
|
ackstatus = 1;
|
else
|
ackstatus = 0;
|
|
arc_printk(D_DURING, dev, "TX IRQ (stat=%Xh)\n",
|
status);
|
|
if (lp->cur_tx != -1 && !lp->timed_out) {
|
if (!(status & TXACKflag)) {
|
if (lp->lasttrans_dest != 0) {
|
arc_printk(D_EXTRA, dev,
|
"transmit was not acknowledged! (status=%Xh, dest=%02Xh)\n",
|
status,
|
lp->lasttrans_dest);
|
dev->stats.tx_errors++;
|
dev->stats.tx_carrier_errors++;
|
} else {
|
arc_printk(D_DURING, dev,
|
"broadcast was not acknowledged; that's normal (status=%Xh, dest=%02Xh)\n",
|
status,
|
lp->lasttrans_dest);
|
}
|
}
|
|
if (lp->outgoing.proto &&
|
lp->outgoing.proto->ack_tx) {
|
lp->outgoing.proto
|
->ack_tx(dev, ackstatus);
|
}
|
lp->reply_status = ackstatus;
|
tasklet_hi_schedule(&lp->reply_tasklet);
|
}
|
if (lp->cur_tx != -1)
|
release_arcbuf(dev, lp->cur_tx);
|
|
lp->cur_tx = -1;
|
lp->timed_out = 0;
|
didsomething++;
|
|
/* send another packet if there is one */
|
go_tx(dev);
|
|
/* continue a split packet, if any */
|
if (lp->outgoing.proto &&
|
lp->outgoing.proto->continue_tx) {
|
int txbuf = get_arcbuf(dev);
|
|
if (txbuf != -1) {
|
if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
|
/* that was the last segment */
|
dev->stats.tx_bytes += lp->outgoing.skb->len;
|
if (!lp->outgoing.proto->ack_tx) {
|
dev_kfree_skb_irq(lp->outgoing.skb);
|
lp->outgoing.proto = NULL;
|
}
|
}
|
lp->next_tx = txbuf;
|
}
|
}
|
/* inform upper layers of idleness, if necessary */
|
if (lp->cur_tx == -1)
|
netif_wake_queue(dev);
|
}
|
/* now process the received packet, if any */
|
if (recbuf != -1) {
|
if (BUGLVL(D_RX))
|
arcnet_dump_packet(dev, recbuf, "rx irq", 0);
|
|
arcnet_rx(dev, recbuf);
|
release_arcbuf(dev, recbuf);
|
|
didsomething++;
|
}
|
if (status & lp->intmask & RECONflag) {
|
lp->hw.command(dev, CFLAGScmd | CONFIGclear);
|
dev->stats.tx_carrier_errors++;
|
|
arc_printk(D_RECON, dev, "Network reconfiguration detected (status=%Xh)\n",
|
status);
|
if (netif_carrier_ok(dev)) {
|
netif_carrier_off(dev);
|
netdev_info(dev, "link down\n");
|
}
|
mod_timer(&lp->timer, jiffies + msecs_to_jiffies(1000));
|
|
arcnet_led_event(dev, ARCNET_LED_EVENT_RECON);
|
/* MYRECON bit is at bit 7 of diagstatus */
|
if (diagstatus & 0x80)
|
arc_printk(D_RECON, dev, "Put out that recon myself\n");
|
|
/* is the RECON info empty or old? */
|
if (!lp->first_recon || !lp->last_recon ||
|
time_after(jiffies, lp->last_recon + HZ * 10)) {
|
if (lp->network_down)
|
arc_printk(D_NORMAL, dev, "reconfiguration detected: cabling restored?\n");
|
lp->first_recon = lp->last_recon = jiffies;
|
lp->num_recons = lp->network_down = 0;
|
|
arc_printk(D_DURING, dev, "recon: clearing counters.\n");
|
} else { /* add to current RECON counter */
|
lp->last_recon = jiffies;
|
lp->num_recons++;
|
|
arc_printk(D_DURING, dev, "recon: counter=%d, time=%lds, net=%d\n",
|
lp->num_recons,
|
(lp->last_recon - lp->first_recon) / HZ,
|
lp->network_down);
|
|
/* if network is marked up;
|
* and first_recon and last_recon are 60+ apart;
|
* and the average no. of recons counted is
|
* > RECON_THRESHOLD/min;
|
* then print a warning message.
|
*/
|
if (!lp->network_down &&
|
(lp->last_recon - lp->first_recon) <= HZ * 60 &&
|
lp->num_recons >= RECON_THRESHOLD) {
|
lp->network_down = 1;
|
arc_printk(D_NORMAL, dev, "many reconfigurations detected: cabling problem?\n");
|
} else if (!lp->network_down &&
|
lp->last_recon - lp->first_recon > HZ * 60) {
|
/* reset counters if we've gone for
|
* over a minute.
|
*/
|
lp->first_recon = lp->last_recon;
|
lp->num_recons = 1;
|
}
|
}
|
} else if (lp->network_down &&
|
time_after(jiffies, lp->last_recon + HZ * 10)) {
|
if (lp->network_down)
|
arc_printk(D_NORMAL, dev, "cabling restored?\n");
|
lp->first_recon = lp->last_recon = 0;
|
lp->num_recons = lp->network_down = 0;
|
|
arc_printk(D_DURING, dev, "not recon: clearing counters anyway.\n");
|
netif_carrier_on(dev);
|
}
|
|
if (didsomething)
|
retval |= IRQ_HANDLED;
|
} while (--boguscount && didsomething);
|
|
arc_printk(D_DURING, dev, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
|
lp->hw.status(dev), boguscount);
|
arc_printk(D_DURING, dev, "\n");
|
|
lp->hw.intmask(dev, 0);
|
udelay(1);
|
lp->hw.intmask(dev, lp->intmask);
|
|
spin_unlock_irqrestore(&lp->lock, flags);
|
return retval;
|
}
|
EXPORT_SYMBOL(arcnet_interrupt);
|
|
/* This is a generic packet receiver that calls arcnet??_rx depending on the
|
* protocol ID found.
|
*/
|
static void arcnet_rx(struct net_device *dev, int bufnum)
|
{
|
struct arcnet_local *lp = netdev_priv(dev);
|
union {
|
struct archdr pkt;
|
char buf[512];
|
} rxdata;
|
struct arc_rfc1201 *soft;
|
int length, ofs;
|
|
soft = &rxdata.pkt.soft.rfc1201;
|
|
lp->hw.copy_from_card(dev, bufnum, 0, &rxdata.pkt, ARC_HDR_SIZE);
|
if (rxdata.pkt.hard.offset[0]) {
|
ofs = rxdata.pkt.hard.offset[0];
|
length = 256 - ofs;
|
} else {
|
ofs = rxdata.pkt.hard.offset[1];
|
length = 512 - ofs;
|
}
|
|
/* get the full header, if possible */
|
if (sizeof(rxdata.pkt.soft) <= length) {
|
lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(rxdata.pkt.soft));
|
} else {
|
memset(&rxdata.pkt.soft, 0, sizeof(rxdata.pkt.soft));
|
lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
|
}
|
|
arc_printk(D_DURING, dev, "Buffer #%d: received packet from %02Xh to %02Xh (%d+4 bytes)\n",
|
bufnum, rxdata.pkt.hard.source, rxdata.pkt.hard.dest, length);
|
|
dev->stats.rx_packets++;
|
dev->stats.rx_bytes += length + ARC_HDR_SIZE;
|
|
/* call the right receiver for the protocol */
|
if (arc_proto_map[soft->proto]->is_ip) {
|
if (BUGLVL(D_PROTO)) {
|
struct ArcProto
|
*oldp = arc_proto_map[lp->default_proto[rxdata.pkt.hard.source]],
|
*newp = arc_proto_map[soft->proto];
|
|
if (oldp != newp) {
|
arc_printk(D_PROTO, dev,
|
"got protocol %02Xh; encap for host %02Xh is now '%c' (was '%c')\n",
|
soft->proto, rxdata.pkt.hard.source,
|
newp->suffix, oldp->suffix);
|
}
|
}
|
|
/* broadcasts will always be done with the last-used encap. */
|
lp->default_proto[0] = soft->proto;
|
|
/* in striking contrast, the following isn't a hack. */
|
lp->default_proto[rxdata.pkt.hard.source] = soft->proto;
|
}
|
/* call the protocol-specific receiver. */
|
arc_proto_map[soft->proto]->rx(dev, bufnum, &rxdata.pkt, length);
|
}
|
|
static void null_rx(struct net_device *dev, int bufnum,
|
struct archdr *pkthdr, int length)
|
{
|
arc_printk(D_PROTO, dev,
|
"rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
|
pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
|
}
|
|
static int null_build_header(struct sk_buff *skb, struct net_device *dev,
|
unsigned short type, uint8_t daddr)
|
{
|
struct arcnet_local *lp = netdev_priv(dev);
|
|
arc_printk(D_PROTO, dev,
|
"tx: can't build header for encap %02Xh; load a protocol driver.\n",
|
lp->default_proto[daddr]);
|
|
/* always fails */
|
return 0;
|
}
|
|
/* the "do nothing" prepare_tx function warns that there's nothing to do. */
|
static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
|
int length, int bufnum)
|
{
|
struct arcnet_local *lp = netdev_priv(dev);
|
struct arc_hardware newpkt;
|
|
arc_printk(D_PROTO, dev, "tx: no encap for this host; load a protocol driver.\n");
|
|
/* send a packet to myself -- will never get received, of course */
|
newpkt.source = newpkt.dest = dev->dev_addr[0];
|
|
/* only one byte of actual data (and it's random) */
|
newpkt.offset[0] = 0xFF;
|
|
lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
|
|
return 1; /* done */
|
}
|
