diff options
Diffstat (limited to 'drivers/net/arcnet/arcnet.c')
| -rw-r--r-- | drivers/net/arcnet/arcnet.c | 1102 |
1 files changed, 1102 insertions, 0 deletions
diff --git a/drivers/net/arcnet/arcnet.c b/drivers/net/arcnet/arcnet.c new file mode 100644 index 00000000000..4f9f69e22c1 --- /dev/null +++ b/drivers/net/arcnet/arcnet.c @@ -0,0 +1,1102 @@ +/* + * 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, 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); + + +/* + * 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, *arc_raw_proto; + +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(arc_proto_map); +EXPORT_SYMBOL(arc_proto_default); +EXPORT_SYMBOL(arc_bcast_proto); +EXPORT_SYMBOL(arc_raw_proto); +EXPORT_SYMBOL(arc_proto_null); +EXPORT_SYMBOL(arcnet_unregister_proto); +EXPORT_SYMBOL(arcnet_debug); +EXPORT_SYMBOL(alloc_arcdev); +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); + +static int debug = ARCNET_DEBUG; +module_param(debug, int, 0); +MODULE_LICENSE("GPL"); + +static int __init arcnet_init(void) +{ + int count; + + arcnet_debug = debug; + + 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-mail\n" + "arcnet: * me if you have any questions, comments, or bug reports.\n" + "arcnet: ***\n"); + } +#endif + + /* 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; + + BUGLVL(D_DURING) + printk("arcnet: 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) +{ + int i; + + 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"); +} + +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, + int take_arcnet_lock) +{ + struct arcnet_local *lp = dev->priv; + int i, length; + unsigned long flags = 0; + static uint8_t buf[512]; + + /* 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); + + 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"); + +} + +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; + 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; + } +} + + +/* + * 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 = 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+1) % 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 = 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+1) % 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. */ +static 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 = 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; + + /* + * 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; +} + +struct net_device *alloc_arcdev(char *name) +{ + struct net_device *dev; + + dev = alloc_netdev(sizeof(struct arcnet_local), + name && *name ? name : "arc%d", arcdev_setup); + if(dev) { + struct arcnet_local *lp = (struct arcnet_local *) dev->priv; + spin_lock_init(&lp->lock); + } + + return dev; +} + +/* + * 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 = dev->priv; + int count, newmtu, error; + + BUGMSG(D_INIT,"opened."); + + if (!try_module_get(lp->hw.owner)) + return -ENODEV; + + 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. + */ + error = -ENODEV; + if (ARCRESET(0) && ARCRESET(1)) + goto out_module_put; + + newmtu = choose_mtu(); + if (newmtu < dev->mtu) + dev->mtu = newmtu; + + BUGMSG(D_INIT, "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) + 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"); + + BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__); + if (ASTATUS() & RESETflag) { + BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__); + ACOMMAND(CFLAGScmd | RESETclear); + } + + + BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__); + /* 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) + */ + BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__); + lp->intmask = NORXflag | RECONflag; + AINTMASK(lp->intmask); + BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__); + + netif_start_queue(dev); + + return 0; + + out_module_put: + module_put(lp->hw.owner); + return error; +} + + +/* The inverse routine to arcnet_open - shuts down the card. */ +static int arcnet_close(struct net_device *dev) +{ + struct arcnet_local *lp = 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 */ + lp->hw.close(dev); + module_put(lp->hw.owner); + 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 = 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 (skb->len!=0 && len != skb->len) + BUGMSG(D_NORMAL, "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; + BUGMSG(D_DEBUG, "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; + if (skb->nh.raw - skb->mac.raw != 2) + BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n", + (int)(skb->nh.raw - skb->mac.raw)); + 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]; + 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, dev, 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 = dev->priv; + int status = 0; /* default is failure */ + unsigned short type; + uint8_t daddr=0; + struct ArcProto *proto; + + if (skb->nh.raw - skb->mac.raw != 2) { + BUGMSG(D_NORMAL, + "rebuild_header: shouldn't be here! (hdrsize=%d)\n", + (int)(skb->nh.raw - skb->mac.raw)); + return 0; + } + type = *(uint16_t *) skb_pull(skb, 2); + BUGMSG(D_DURING, "rebuild header for protocol %Xh\n", type); + + if (type == ETH_P_IP) { +#ifdef CONFIG_INET + BUGMSG(D_DURING, "rebuild header for ethernet protocol %Xh\n", type); + status = arp_find(&daddr, skb) ? 1 : 0; + BUGMSG(D_DURING, " rebuilt: dest is %d; protocol %Xh\n", + 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! */ + proto = arc_proto_map[lp->default_proto[daddr]]; + proto->build_header(skb, dev, 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 = dev->priv; + struct archdr *pkt; + struct arc_rfc1201 *soft; + struct ArcProto *proto; + int txbuf; + unsigned long flags; + int freeskb = 0; + + BUGMSG(D_DURING, + "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n", + ASTATUS(), 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]; + + BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n", + 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); + + spin_lock_irqsave(&lp->lock, flags); + AINTMASK(0); + + txbuf = get_arcbuf(dev); + if (txbuf != -1) { + 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 */ + lp->stats.tx_bytes += skb->len; + freeskb = 1; + } 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)) { + BUGMSG(D_NORMAL, + "bug! continue_tx finished the first time! " + "(proto='%c')\n", proto->suffix); + } + } + + lp->next_tx = txbuf; + } else { + freeskb = 1; + } + + BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__FUNCTION__,ASTATUS()); + /* make sure we didn't ignore a TX IRQ while we were in here */ + AINTMASK(0); + + BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__); + lp->intmask |= TXFREEflag|EXCNAKflag; + AINTMASK(lp->intmask); + BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__FUNCTION__,ASTATUS()); + + spin_unlock_irqrestore(&lp->lock, flags); + if (freeskb) { + dev_kfree_skb(skb); + } + 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 = dev->priv; + + BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n", + 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", 0); + + 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->excnak_pending = 0; + lp->intmask |= TXFREEflag|EXCNAKflag; + + 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 = dev->priv; + int status = ASTATUS(); + char *msg; + + spin_lock_irqsave(&lp->lock, flags); + 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 or a EXC NAK IRQ */ + AINTMASK(0); + lp->intmask |= TXFREEflag|EXCNAKflag; + AINTMASK(lp->intmask); + + spin_unlock_irqrestore(&lp->lock, 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. + */ +irqreturn_t arcnet_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + struct net_device *dev = dev_id; + struct arcnet_local *lp; + int recbuf, status, diagstatus, didsomething, boguscount; + int retval = IRQ_NONE; + + BUGMSG(D_DURING, "\n"); + + BUGMSG(D_DURING, "in arcnet_interrupt\n"); + + lp = dev->priv; + if (!lp) + BUG(); + + spin_lock(&lp->lock); + + /* + * 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); + spin_unlock(&lp->lock); + return IRQ_HANDLED; + } + + BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n", + ASTATUS(), lp->intmask); + + boguscount = 5; + do { + status = ASTATUS(); + diagstatus = (status >> 8) & 0xFF; + + BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n", + __FILE__,__LINE__,__FUNCTION__,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) { + 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 #%d\n", + lp->cur_rx); + ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts); + } + didsomething++; + } + + if((diagstatus & EXCNAKflag)) { + BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n", + diagstatus); + + ACOMMAND(NOTXcmd); /* disable transmit */ + lp->excnak_pending = 1; + + ACOMMAND(EXCNAKclear); + lp->intmask &= ~(EXCNAKflag); + didsomething++; + } + + + /* a transmit finished, and we're interested in it. */ + if ((status & lp->intmask & TXFREEflag) || lp->timed_out) { + lp->intmask &= ~(TXFREEflag|EXCNAKflag); + + BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status); + + if (lp->cur_tx != -1 && !lp->timed_out) { + if(!(status & TXACKflag)) { + 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->outgoing.proto && + lp->outgoing.proto->ack_tx) { + int ackstatus; + if(status & TXACKflag) + ackstatus=2; + else if(lp->excnak_pending) + ackstatus=1; + else + ackstatus=0; + + lp->outgoing.proto + ->ack_tx(dev, ackstatus); + } + } + 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; + 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) { + 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) { + 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=%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; + 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"); + } + + if(didsomething) { + retval |= IRQ_HANDLED; + } + } + 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); + + spin_unlock(&lp->lock); + return retval; +} + + +/* + * 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 = 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]->is_ip) { + 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 = 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, struct net_device *dev, + unsigned short type, uint8_t daddr) +{ + struct arcnet_local *lp = 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 = 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 */ +} |