diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/arcnet/arcnet.c | 1219 |
1 files changed, 1219 insertions, 0 deletions
diff --git a/drivers/net/arcnet/arcnet.c b/drivers/net/arcnet/arcnet.c new file mode 100644 index 000000000..a48220f91 --- /dev/null +++ b/drivers/net/arcnet/arcnet.c @@ -0,0 +1,1219 @@ +/* + * 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; + + spin_lock_irq(&lp->lock); + + if (!lp->reset_in_progress && !netif_carrier_ok(dev)) { + netif_carrier_on(dev); + netdev_info(dev, "link up\n"); + } + + spin_unlock_irq(&lp->lock); +} + +static void reset_device_work(struct work_struct *work) +{ + struct arcnet_local *lp; + struct net_device *dev; + + lp = container_of(work, struct arcnet_local, reset_work); + dev = lp->dev; + + /* Do not bring the network interface back up if an ifdown + * was already done. + */ + if (!netif_running(dev) || !lp->reset_in_progress) + return; + + rtnl_lock(); + + /* Do another check, in case of an ifdown that was triggered in + * the small race window between the exit condition above and + * acquiring RTNL. + */ + if (!netif_running(dev) || !lp->reset_in_progress) + goto out; + + dev_close(dev); + dev_open(dev, NULL); + +out: + rtnl_unlock(); +} + +static void arcnet_reply_tasklet(struct tasklet_struct *t) +{ + struct arcnet_local *lp = from_tasklet(lp, t, reply_tasklet); + + 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) + dev_kfree_skb_irq(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); + INIT_WORK(&lp->reset_work, reset_device_work); + } + + return dev; +} +EXPORT_SYMBOL(alloc_arcdev); + +void free_arcdev(struct net_device *dev) +{ + struct arcnet_local *lp = netdev_priv(dev); + + /* Do not cancel this at ->ndo_close(), as the workqueue itself + * indirectly calls the ifdown path through dev_close(). + */ + cancel_work_sync(&lp->reset_work); + free_netdev(dev); +} +EXPORT_SYMBOL(free_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_setup(&lp->reply_tasklet, arcnet_reply_tasklet); + + 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); + + /* reset counters */ + lp->reset_in_progress = 0; + + 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 int txqueue) +{ + 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); + + if (lp->reset_in_progress) + goto out; + + /* 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); + + lp->reset_in_progress = 1; + netif_stop_queue(dev); + netif_carrier_off(dev); + schedule_work(&lp->reset_work); + + /* get out of the interrupt handler! */ + goto out; + } + /* 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); + +out: + 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 */ +} |