arcnet.c
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上传日期:2013-02-24
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- /*
- * 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 VERSION "arcnet: v3.93 BETA 2000/04/29 - by Avery Pennarun et al.n"
- #include <linux/module.h>
- #include <linux/config.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/arcdevice.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, unsigned short type,
- uint8_t daddr);
- static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
- int length, 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], *arc_proto_default, *arc_bcast_proto;
- struct ArcProto arc_proto_null =
- {
- '?',
- XMTU,
- null_rx,
- null_build_header,
- null_prepare_tx
- };
- /* Exported function prototypes */
- int arcnet_debug = ARCNET_DEBUG;
- EXPORT_SYMBOL(arc_proto_map);
- EXPORT_SYMBOL(arc_proto_default);
- EXPORT_SYMBOL(arc_bcast_proto);
- EXPORT_SYMBOL(arc_proto_null);
- EXPORT_SYMBOL(arcnet_unregister_proto);
- EXPORT_SYMBOL(arcnet_debug);
- EXPORT_SYMBOL(arcdev_setup);
- EXPORT_SYMBOL(arcnet_interrupt);
- /* Internal function prototypes */
- static int arcnet_open(struct net_device *dev);
- static int arcnet_close(struct net_device *dev);
- static int arcnet_send_packet(struct sk_buff *skb, struct net_device *dev);
- static void arcnet_timeout(struct net_device *dev);
- static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
- unsigned short type, void *daddr, void *saddr,
- unsigned len);
- static int arcnet_rebuild_header(struct sk_buff *skb);
- static struct net_device_stats *arcnet_get_stats(struct net_device *dev);
- static int go_tx(struct net_device *dev);
- void __init arcnet_init(void)
- {
- static int arcnet_inited;
- int count;
- if (arcnet_inited++)
- return;
- printk(VERSION);
- #ifdef ALPHA_WARNING
- BUGLVL(D_EXTRA) {
- printk("arcnet: ***n"
- "arcnet: * Read arcnet.txt for important release notes!n"
- "arcnet: *n"
- "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mailn"
- "arcnet: * me if you have any questions, comments, or bug reports.n"
- "arcnet: ***n");
- }
- #endif
- /* initialize the protocol map */
- arc_proto_default = arc_bcast_proto = &arc_proto_null;
- for (count = 0; count < 256; count++)
- arc_proto_map[count] = arc_proto_default;
- BUGLVL(D_DURING)
- printk("arcnet: struct sizes: %d %d %d %d %dn",
- sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
- sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
- sizeof(struct archdr));
- #ifdef CONFIG_ARCNET /* We're not built as a module */
- printk("arcnet: Available protocols:");
- #ifdef CONFIG_ARCNET_1201
- printk(" RFC1201");
- arcnet_rfc1201_init();
- #endif
- #ifdef CONFIG_ARCNET_1051
- printk(" RFC1051");
- arcnet_rfc1051_init();
- #endif
- #ifdef CONFIG_ARCNET_RAW
- printk(" RAW");
- arcnet_raw_init();
- #endif
- printk("n");
- #ifdef CONFIG_ARCNET_COM90xx
- com90xx_probe(NULL);
- #endif
- #endif
- }
- #ifdef MODULE
- static int debug = ARCNET_DEBUG;
- MODULE_PARM(debug, "i");
- int __init init_module(void)
- {
- arcnet_debug = debug;
- arcnet_init();
- return 0;
- }
- void cleanup_module(void)
- {
- }
- #endif
- /*
- * 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)
- {
- int i;
- long flags;
- save_flags(flags);
- cli();
- printk(KERN_DEBUG "%6s: skb dump (%s) follows:", dev->name, desc);
- for (i = 0; i < skb->len; i++) {
- if (i % 16 == 0)
- printk("n" KERN_DEBUG "[%04X] ", i);
- printk("%02X ", ((u_char *) skb->data)[i]);
- }
- printk("n");
- restore_flags(flags);
- }
- EXPORT_SYMBOL(arcnet_dump_skb);
- #endif
- /*
- * Dump the contents of an ARCnet buffer
- */
- #if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
- void arcnet_dump_packet(struct net_device *dev, int bufnum, char *desc)
- {
- struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
- int i, length;
- long flags;
- static uint8_t buf[512];
- save_flags(flags);
- cli();
- lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
- /* if the offset[0] byte is nonzero, this is a 256-byte packet */
- length = (buf[2] ? 256 : 512);
- printk(KERN_DEBUG "%6s: packet dump (%s) follows:", dev->name, desc);
- for (i = 0; i < length; i++) {
- if (i % 16 == 0)
- printk("n" KERN_DEBUG "[%04X] ", i);
- printk("%02X ", buf[i]);
- }
- printk("n");
- restore_flags(flags);
- }
- EXPORT_SYMBOL(arcnet_dump_packet);
- #endif
- /*
- * 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;
- for (count = 0; count < 256; count++) {
- if (arc_proto_map[count] == proto)
- arc_proto_map[count] = arc_proto_default;
- }
- }
- /*
- * 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 = (struct arcnet_local *) dev->priv;
- int i;
- lp->buf_queue[lp->first_free_buf++] = bufnum;
- lp->first_free_buf %= 5;
- BUGLVL(D_DURING) {
- BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ",
- bufnum);
- for (i = lp->next_buf; i != lp->first_free_buf; i = ++i % 5)
- BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
- BUGMSG2(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 = (struct arcnet_local *) dev->priv;
- int buf = -1, i;
- if (!atomic_dec_and_test(&lp->buf_lock)) /* already in this function */
- BUGMSG(D_NORMAL, "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)
- BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??n");
- else {
- buf = lp->buf_queue[lp->next_buf++];
- lp->next_buf %= 5;
- }
- }
- BUGLVL(D_DURING) {
- BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf);
- for (i = lp->next_buf; i != lp->first_free_buf; i = ++i % 5)
- BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
- BUGMSG2(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;
- }
- /* Setup a struct device for ARCnet. */
- void arcdev_setup(struct net_device *dev)
- {
- dev->type = ARPHRD_ARCNET;
- dev->hard_header_len = sizeof(struct archdr);
- dev->mtu = choose_mtu();
- dev->addr_len = 1;
- dev->tx_queue_len = 30;
- dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */
- dev->watchdog_timeo = TX_TIMEOUT;
- /* New-style flags. */
- dev->flags = IFF_BROADCAST;
- /*
- * Put in this stuff here, so we don't have to export the symbols to
- * the chipset drivers.
- */
- dev->open = arcnet_open;
- dev->stop = arcnet_close;
- dev->hard_start_xmit = arcnet_send_packet;
- dev->tx_timeout = arcnet_timeout;
- dev->get_stats = arcnet_get_stats;
- dev->hard_header = arcnet_header;
- dev->rebuild_header = arcnet_rebuild_header;
- }
- /*
- * 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.
- */
- static int arcnet_open(struct net_device *dev)
- {
- struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
- int count, newmtu;
- BUGLVL(D_PROTO) {
- int count;
- BUGMSG(D_PROTO, "protocol map (default is '%c'): ",
- arc_proto_default->suffix);
- for (count = 0; count < 256; count++)
- BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix);
- BUGMSG2(D_PROTO, "n");
- }
- BUGMSG(D_INIT, "arcnet_open: resetting card.n");
- /* try to put the card in a defined state - if it fails the first
- * time, actually reset it.
- */
- if (ARCRESET(0) && ARCRESET(1))
- return -ENODEV;
- newmtu = choose_mtu();
- if (newmtu < dev->mtu)
- dev->mtu = newmtu;
- /* 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 */
- ARCOPEN(1);
- if (dev->dev_addr[0] == 0)
- BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved "
- "for broadcasts!n");
- else if (dev->dev_addr[0] == 255)
- BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse "
- "DOS networking programs!n");
- if (ASTATUS() & RESETflag)
- ACOMMAND(CFLAGScmd | RESETclear);
- /* make sure we're ready to receive IRQ's. */
- AINTMASK(0);
- udelay(1); /* give it time to set the mask before
- * we reset it again. (may not even be
- * necessary)
- */
- lp->intmask = NORXflag | RECONflag;
- AINTMASK(lp->intmask);
- netif_start_queue(dev);
- return 0;
- }
- /* The inverse routine to arcnet_open - shuts down the card. */
- static int arcnet_close(struct net_device *dev)
- {
- struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
- netif_stop_queue(dev);
- /* flush TX and disable RX */
- AINTMASK(0);
- ACOMMAND(NOTXcmd); /* stop transmit */
- ACOMMAND(NORXcmd); /* disable receive */
- mdelay(1);
- /* shut down the card */
- ARCOPEN(0);
- return 0;
- }
- static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
- unsigned short type, void *daddr, void *saddr,
- unsigned len)
- {
- struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
- uint8_t _daddr, proto_num;
- struct ArcProto *proto;
- BUGMSG(D_DURING,
- "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 (len != skb->len)
- BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!n",
- skb->len, len);
- /*
- * 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.
- */
- if (!daddr) {
- *(uint16_t *) skb_push(skb, 2) = type;
- if (skb->nh.raw - skb->mac.raw != 2)
- BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!n",
- skb->nh.raw - skb->mac.raw);
- return -2; /* return error -- can't transmit yet! */
- }
- /* 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];
- BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'n",
- proto_num, proto->suffix);
- if (proto == &arc_proto_null && arc_bcast_proto != proto) {
- BUGMSG(D_DURING, "actually, let's use '%c' instead.n",
- arc_bcast_proto->suffix);
- proto = arc_bcast_proto;
- }
- return proto->build_header(skb, type, _daddr);
- }
- /*
- * Rebuild the ARCnet hard header. This is called after an ARP (or in the
- * future other address resolution) has completed on this sk_buff. We now
- * let ARP fill in the destination field.
- */
- static int arcnet_rebuild_header(struct sk_buff *skb)
- {
- struct net_device *dev = skb->dev;
- struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
- int status = 0; /* default is failure */
- unsigned short type;
- uint8_t daddr=0;
- if (skb->nh.raw - skb->mac.raw != 2) {
- BUGMSG(D_NORMAL,
- "rebuild_header: shouldn't be here! (hdrsize=%d)n",
- skb->nh.raw - skb->mac.raw);
- return 0;
- }
- type = *(uint16_t *) skb_pull(skb, 2);
- if (type == ETH_P_IP) {
- #ifdef CONFIG_INET
- BUGMSG(D_DURING, "rebuild header for ethernet protocol %Xhn", type);
- status = arp_find(&daddr, skb) ? 1 : 0;
- BUGMSG(D_DURING, " rebuilt: dest is %d; protocol %Xhn",
- daddr, type);
- #endif
- } else {
- BUGMSG(D_NORMAL,
- "I don't understand ethernet protocol %Xh addresses!n", type);
- lp->stats.tx_errors++;
- lp->stats.tx_aborted_errors++;
- }
- /* if we couldn't resolve the address... give up. */
- if (!status)
- return 0;
- /* add the _real_ header this time! */
- arc_proto_map[lp->default_proto[daddr]]->build_header(skb, type, daddr);
- return 1; /* success */
- }
- /* Called by the kernel in order to transmit a packet. */
- static int arcnet_send_packet(struct sk_buff *skb, struct net_device *dev)
- {
- struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
- struct archdr *pkt;
- struct arc_rfc1201 *soft;
- struct ArcProto *proto;
- int txbuf;
- BUGMSG(D_DURING,
- "transmit requested (status=%Xh, txbufs=%d/%d, len=%d)n",
- ASTATUS(), lp->cur_tx, lp->next_tx, skb->len);
- pkt = (struct archdr *) skb->data;
- soft = &pkt->soft.rfc1201;
- proto = arc_proto_map[soft->proto];
- BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02Xn",
- skb->len, pkt->hard.dest);
- BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "tx");
- /* fits in one packet? */
- if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
- BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!n");
- dev_kfree_skb(skb);
- return 0; /* don't try again */
- }
- /* We're busy transmitting a packet... */
- netif_stop_queue(dev);
- AINTMASK(0);
- txbuf = get_arcbuf(dev);
- if (txbuf != -1) {
- if (proto->prepare_tx(dev, pkt, skb->len, txbuf)) {
- /* done right away */
- lp->stats.tx_bytes += skb->len;
- dev_kfree_skb(skb);
- } else {
- /* do it the 'split' way */
- lp->outgoing.proto = proto;
- lp->outgoing.skb = skb;
- lp->outgoing.pkt = pkt;
- if (!proto->continue_tx)
- BUGMSG(D_NORMAL, "bug! prep_tx==0, but no continue_tx!n");
- else if (proto->continue_tx(dev, txbuf)) {
- BUGMSG(D_NORMAL,
- "bug! continue_tx finished the first time! "
- "(proto='%c')n", proto->suffix);
- }
- }
- lp->next_tx = txbuf;
- } else
- dev_kfree_skb(skb);
- /* make sure we didn't ignore a TX IRQ while we were in here */
- AINTMASK(0);
- lp->intmask |= TXFREEflag;
- AINTMASK(lp->intmask);
- return 0; /* no need to try again */
- }
- /*
- * 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 = (struct arcnet_local *) dev->priv;
- BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%dn",
- ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx);
- if (lp->cur_tx != -1 || lp->next_tx == -1)
- return 0;
- BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx");
- lp->cur_tx = lp->next_tx;
- lp->next_tx = -1;
- /* start sending */
- ACOMMAND(TXcmd | (lp->cur_tx << 3));
- dev->trans_start = jiffies;
- lp->stats.tx_packets++;
- lp->lasttrans_dest = lp->lastload_dest;
- lp->lastload_dest = 0;
- lp->intmask |= TXFREEflag;
- return 1;
- }
- /* Called by the kernel when transmit times out */
- static void arcnet_timeout(struct net_device *dev)
- {
- unsigned long flags;
- struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
- int status = ASTATUS();
- char *msg;
- save_flags(flags);
- cli();
- if (status & TXFREEflag) { /* transmit _DID_ finish */
- msg = " - missed IRQ?";
- } else {
- msg = "";
- lp->stats.tx_aborted_errors++;
- lp->timed_out = 1;
- ACOMMAND(NOTXcmd | (lp->cur_tx << 3));
- }
- lp->stats.tx_errors++;
- /* make sure we didn't miss a TX IRQ */
- AINTMASK(0);
- lp->intmask |= TXFREEflag;
- AINTMASK(lp->intmask);
- restore_flags(flags);
- if (jiffies - lp->last_timeout > 10*HZ) {
- BUGMSG(D_EXTRA, "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);
- }
- /*
- * The typical workload of the driver: Handle the network interface
- * interrupts. Establish which device needs attention, and call the correct
- * chipset interrupt handler.
- */
- void arcnet_interrupt(int irq, void *dev_id, struct pt_regs *regs)
- {
- struct net_device *dev = dev_id;
- struct arcnet_local *lp;
- int recbuf, status, didsomething, boguscount;
- BUGMSG(D_DURING, "n");
- if (dev == NULL) {
- BUGMSG(D_DURING, "arcnet: irq %d for unknown device.n", irq);
- return;
- }
- BUGMSG(D_DURING, "in arcnet_interruptn");
- lp = (struct arcnet_local *) dev->priv;
- if (!lp) {
- BUGMSG(D_DURING, "arcnet: irq ignored due to missing lp.n");
- return;
- }
- /*
- * RESET flag was enabled - if device is not running, we must clear it right
- * away (but nothing else).
- */
- if (!netif_running(dev)) {
- if (ASTATUS() & RESETflag)
- ACOMMAND(CFLAGScmd | RESETclear);
- AINTMASK(0);
- return;
- }
- BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)n",
- ASTATUS(), lp->intmask);
- boguscount = 5;
- do {
- status = ASTATUS();
- 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) {
- BUGMSG(D_NORMAL, "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;
- BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)n",
- recbuf, status);
- lp->cur_rx = get_arcbuf(dev);
- if (lp->cur_rx != -1) {
- BUGMSG(D_DURING, "enabling receive to buffer #%dn",
- lp->cur_rx);
- ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts);
- }
- didsomething++;
- }
- /* a transmit finished, and we're interested in it. */
- if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
- lp->intmask &= ~TXFREEflag;
- BUGMSG(D_DURING, "TX IRQ (stat=%Xh)n", status);
- if (lp->cur_tx != -1 && !(status & TXACKflag) && !lp->timed_out) {
- if (lp->lasttrans_dest != 0) {
- BUGMSG(D_EXTRA, "transmit was not acknowledged! "
- "(status=%Xh, dest=%02Xh)n",
- status, lp->lasttrans_dest);
- lp->stats.tx_errors++;
- lp->stats.tx_carrier_errors++;
- } else {
- BUGMSG(D_DURING,
- "broadcast was not acknowledged; that's normal "
- "(status=%Xh, dest=%02Xh)n",
- status, lp->lasttrans_dest);
- }
- }
- 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 */
- lp->stats.tx_bytes += lp->outgoing.skb->len;
- 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) {
- BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq");
- arcnet_rx(dev, recbuf);
- release_arcbuf(dev, recbuf);
- didsomething++;
- }
- if (status & lp->intmask & RECONflag) {
- ACOMMAND(CFLAGScmd | CONFIGclear);
- lp->stats.tx_carrier_errors++;
- BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)n",
- status);
- /* is the RECON info empty or old? */
- if (!lp->first_recon || !lp->last_recon ||
- jiffies - lp->last_recon > HZ * 10) {
- if (lp->network_down)
- BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?n");
- lp->first_recon = lp->last_recon = jiffies;
- lp->num_recons = lp->network_down = 0;
- BUGMSG(D_DURING, "recon: clearing counters.n");
- } else { /* add to current RECON counter */
- lp->last_recon = jiffies;
- lp->num_recons++;
- BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%dn",
- 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;
- BUGMSG(D_NORMAL, "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 && jiffies - lp->last_recon > HZ * 10) {
- if (lp->network_down)
- BUGMSG(D_NORMAL, "cabling restored?n");
- lp->first_recon = lp->last_recon = 0;
- lp->num_recons = lp->network_down = 0;
- BUGMSG(D_DURING, "not recon: clearing counters anyway.n");
- }
- }
- while (--boguscount && didsomething);
- BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)n",
- ASTATUS(), boguscount);
- BUGMSG(D_DURING, "n");
- AINTMASK(0);
- udelay(1);
- AINTMASK(lp->intmask);
- }
- /*
- * This is a generic packet receiver that calls arcnet??_rx depending on the
- * protocol ID found.
- */
- void arcnet_rx(struct net_device *dev, int bufnum)
- {
- struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
- struct archdr pkt;
- struct arc_rfc1201 *soft;
- int length, ofs;
- soft = &pkt.soft.rfc1201;
- lp->hw.copy_from_card(dev, bufnum, 0, &pkt, sizeof(ARC_HDR_SIZE));
- if (pkt.hard.offset[0]) {
- ofs = pkt.hard.offset[0];
- length = 256 - ofs;
- } else {
- ofs = pkt.hard.offset[1];
- length = 512 - ofs;
- }
- /* get the full header, if possible */
- if (sizeof(pkt.soft) < length)
- lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
- else {
- memset(&pkt.soft, 0, sizeof(pkt.soft));
- lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
- }
- BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh "
- "(%d+4 bytes)n",
- bufnum, pkt.hard.source, pkt.hard.dest, length);
- lp->stats.rx_packets++;
- lp->stats.rx_bytes += length + ARC_HDR_SIZE;
- /* call the right receiver for the protocol */
- if (arc_proto_map[soft->proto] != &arc_proto_null) {
- BUGLVL(D_PROTO) {
- struct ArcProto
- *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
- *newp = arc_proto_map[soft->proto];
- if (oldp != newp) {
- BUGMSG(D_PROTO,
- "got protocol %02Xh; encap for host %02Xh is now '%c'"
- " (was '%c')n", soft->proto, 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[pkt.hard.source] = soft->proto;
- }
- /* call the protocol-specific receiver. */
- arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
- }
- /*
- * Get the current statistics. This may be called with the card open or
- * closed.
- */
- static struct net_device_stats *arcnet_get_stats(struct net_device *dev)
- {
- struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
- return &lp->stats;
- }
- static void null_rx(struct net_device *dev, int bufnum,
- struct archdr *pkthdr, int length)
- {
- BUGMSG(D_PROTO,
- "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, unsigned short type,
- uint8_t daddr)
- {
- struct net_device *dev = skb->dev;
- struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
- BUGMSG(D_PROTO,
- "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 = (struct arcnet_local *) dev->priv;
- struct arc_hardware newpkt;
- BUGMSG(D_PROTO, "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 */
- }