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1/*2 * Linux ARCnet driver - device-independent routines3 *4 * Written 1997 by David Woodhouse.5 * Written 1994-1999 by Avery Pennarun.6 * Written 1999-2000 by Martin Mares <mj@ucw.cz>.7 * Derived from skeleton.c by Donald Becker.8 *9 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)10 * for sponsoring the further development of this driver.11 *12 * **********************13 *14 * The original copyright was as follows:15 *16 * skeleton.c Written 1993 by Donald Becker.17 * Copyright 1993 United States Government as represented by the18 * Director, National Security Agency. This software may only be used19 * and distributed according to the terms of the GNU General Public License as20 * modified by SRC, incorporated herein by reference.21 *22 * **********************23 *24 * The change log is now in a file called ChangeLog in this directory.25 *26 * Sources:27 * - Crynwr arcnet.com/arcether.com packet drivers.28 * - arcnet.c v0.00 dated 1/1/94 and apparently by29 * Donald Becker - it didn't work :)30 * - skeleton.c v0.05 dated 11/16/93 by Donald Becker31 * (from Linux Kernel 1.1.45)32 * - RFC's 1201 and 1051 - re: TCP/IP over ARCnet33 * - The official ARCnet COM9026 data sheets (!) thanks to34 * Ken Cornetet <kcornete@nyx10.cs.du.edu>35 * - The official ARCnet COM20020 data sheets.36 * - Information on some more obscure ARCnet controller chips, thanks37 * to the nice people at SMSC.38 * - net/inet/eth.c (from kernel 1.1.50) for header-building info.39 * - Alternate Linux ARCnet source by V.Shergin <vsher@sao.stavropol.su>40 * - Textual information and more alternate source from Joachim Koenig41 * <jojo@repas.de>42 */43 44#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt45 46#include <linux/module.h>47#include <linux/types.h>48#include <linux/delay.h>49#include <linux/netdevice.h>50#include <linux/if_arp.h>51#include <net/arp.h>52#include <linux/init.h>53#include <linux/jiffies.h>54#include <linux/errqueue.h>55 56#include <linux/leds.h>57#include <linux/workqueue.h>58 59#include "arcdevice.h"60#include "com9026.h"61 62/* "do nothing" functions for protocol drivers */63static void null_rx(struct net_device *dev, int bufnum,64 struct archdr *pkthdr, int length);65static int null_build_header(struct sk_buff *skb, struct net_device *dev,66 unsigned short type, uint8_t daddr);67static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,68 int length, int bufnum);69 70static void arcnet_rx(struct net_device *dev, int bufnum);71 72/* one ArcProto per possible proto ID. None of the elements of73 * arc_proto_map are allowed to be NULL; they will get set to74 * arc_proto_default instead. It also must not be NULL; if you would like75 * to set it to NULL, set it to &arc_proto_null instead.76 */77struct ArcProto *arc_proto_map[256];78EXPORT_SYMBOL(arc_proto_map);79 80struct ArcProto *arc_proto_default;81EXPORT_SYMBOL(arc_proto_default);82 83struct ArcProto *arc_bcast_proto;84EXPORT_SYMBOL(arc_bcast_proto);85 86struct ArcProto *arc_raw_proto;87EXPORT_SYMBOL(arc_raw_proto);88 89static struct ArcProto arc_proto_null = {90 .suffix = '?',91 .mtu = XMTU,92 .is_ip = 0,93 .rx = null_rx,94 .build_header = null_build_header,95 .prepare_tx = null_prepare_tx,96 .continue_tx = NULL,97 .ack_tx = NULL98};99 100/* Exported function prototypes */101int arcnet_debug = ARCNET_DEBUG;102EXPORT_SYMBOL(arcnet_debug);103 104/* Internal function prototypes */105static int arcnet_header(struct sk_buff *skb, struct net_device *dev,106 unsigned short type, const void *daddr,107 const void *saddr, unsigned len);108static int go_tx(struct net_device *dev);109 110static int debug = ARCNET_DEBUG;111module_param(debug, int, 0);112MODULE_DESCRIPTION("ARCnet core driver");113MODULE_LICENSE("GPL");114 115static int __init arcnet_init(void)116{117 int count;118 119 arcnet_debug = debug;120 121 pr_info("arcnet loaded\n");122 123 /* initialize the protocol map */124 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;125 for (count = 0; count < 256; count++)126 arc_proto_map[count] = arc_proto_default;127 128 if (BUGLVL(D_DURING))129 pr_info("struct sizes: %zd %zd %zd %zd %zd\n",130 sizeof(struct arc_hardware),131 sizeof(struct arc_rfc1201),132 sizeof(struct arc_rfc1051),133 sizeof(struct arc_eth_encap),134 sizeof(struct archdr));135 136 return 0;137}138 139static void __exit arcnet_exit(void)140{141}142 143module_init(arcnet_init);144module_exit(arcnet_exit);145 146/* Dump the contents of an sk_buff */147#if ARCNET_DEBUG_MAX & D_SKB148void arcnet_dump_skb(struct net_device *dev,149 struct sk_buff *skb, char *desc)150{151 char hdr[32];152 153 /* dump the packet */154 snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);155 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,156 16, 1, skb->data, skb->len, true);157}158EXPORT_SYMBOL(arcnet_dump_skb);159#endif160 161/* Dump the contents of an ARCnet buffer */162#if (ARCNET_DEBUG_MAX & (D_RX | D_TX))163static void arcnet_dump_packet(struct net_device *dev, int bufnum,164 char *desc, int take_arcnet_lock)165{166 struct arcnet_local *lp = netdev_priv(dev);167 int i, length;168 unsigned long flags = 0;169 static uint8_t buf[512];170 char hdr[32];171 172 /* hw.copy_from_card expects IRQ context so take the IRQ lock173 * to keep it single threaded174 */175 if (take_arcnet_lock)176 spin_lock_irqsave(&lp->lock, flags);177 178 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);179 if (take_arcnet_lock)180 spin_unlock_irqrestore(&lp->lock, flags);181 182 /* if the offset[0] byte is nonzero, this is a 256-byte packet */183 length = (buf[2] ? 256 : 512);184 185 /* dump the packet */186 snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);187 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,188 16, 1, buf, length, true);189}190 191#else192 193#define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) do { } while (0)194 195#endif196 197/* Trigger a LED event in response to a ARCNET device event */198void arcnet_led_event(struct net_device *dev, enum arcnet_led_event event)199{200 struct arcnet_local *lp = netdev_priv(dev);201 202 switch (event) {203 case ARCNET_LED_EVENT_RECON:204 led_trigger_blink_oneshot(lp->recon_led_trig, 350, 350, 0);205 break;206 case ARCNET_LED_EVENT_OPEN:207 led_trigger_event(lp->tx_led_trig, LED_OFF);208 led_trigger_event(lp->recon_led_trig, LED_OFF);209 break;210 case ARCNET_LED_EVENT_STOP:211 led_trigger_event(lp->tx_led_trig, LED_OFF);212 led_trigger_event(lp->recon_led_trig, LED_OFF);213 break;214 case ARCNET_LED_EVENT_TX:215 led_trigger_blink_oneshot(lp->tx_led_trig, 50, 50, 0);216 break;217 }218}219EXPORT_SYMBOL_GPL(arcnet_led_event);220 221static void arcnet_led_release(struct device *gendev, void *res)222{223 struct arcnet_local *lp = netdev_priv(to_net_dev(gendev));224 225 led_trigger_unregister_simple(lp->tx_led_trig);226 led_trigger_unregister_simple(lp->recon_led_trig);227}228 229/* Register ARCNET LED triggers for a arcnet device230 *231 * This is normally called from a driver's probe function232 */233void devm_arcnet_led_init(struct net_device *netdev, int index, int subid)234{235 struct arcnet_local *lp = netdev_priv(netdev);236 void *res;237 238 res = devres_alloc(arcnet_led_release, 0, GFP_KERNEL);239 if (!res) {240 netdev_err(netdev, "cannot register LED triggers\n");241 return;242 }243 244 snprintf(lp->tx_led_trig_name, sizeof(lp->tx_led_trig_name),245 "arc%d-%d-tx", index, subid);246 snprintf(lp->recon_led_trig_name, sizeof(lp->recon_led_trig_name),247 "arc%d-%d-recon", index, subid);248 249 led_trigger_register_simple(lp->tx_led_trig_name,250 &lp->tx_led_trig);251 led_trigger_register_simple(lp->recon_led_trig_name,252 &lp->recon_led_trig);253 254 devres_add(&netdev->dev, res);255}256EXPORT_SYMBOL_GPL(devm_arcnet_led_init);257 258/* Unregister a protocol driver from the arc_proto_map. Protocol drivers259 * are responsible for registering themselves, but the unregister routine260 * is pretty generic so we'll do it here.261 */262void arcnet_unregister_proto(struct ArcProto *proto)263{264 int count;265 266 if (arc_proto_default == proto)267 arc_proto_default = &arc_proto_null;268 if (arc_bcast_proto == proto)269 arc_bcast_proto = arc_proto_default;270 if (arc_raw_proto == proto)271 arc_raw_proto = arc_proto_default;272 273 for (count = 0; count < 256; count++) {274 if (arc_proto_map[count] == proto)275 arc_proto_map[count] = arc_proto_default;276 }277}278EXPORT_SYMBOL(arcnet_unregister_proto);279 280/* Add a buffer to the queue. Only the interrupt handler is allowed to do281 * this, unless interrupts are disabled.282 *283 * Note: we don't check for a full queue, since there aren't enough buffers284 * to more than fill it.285 */286static void release_arcbuf(struct net_device *dev, int bufnum)287{288 struct arcnet_local *lp = netdev_priv(dev);289 int i;290 291 lp->buf_queue[lp->first_free_buf++] = bufnum;292 lp->first_free_buf %= 5;293 294 if (BUGLVL(D_DURING)) {295 arc_printk(D_DURING, dev, "release_arcbuf: freed #%d; buffer queue is now: ",296 bufnum);297 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)298 arc_cont(D_DURING, "#%d ", lp->buf_queue[i]);299 arc_cont(D_DURING, "\n");300 }301}302 303/* Get a buffer from the queue.304 * If this returns -1, there are no buffers available.305 */306static int get_arcbuf(struct net_device *dev)307{308 struct arcnet_local *lp = netdev_priv(dev);309 int buf = -1, i;310 311 if (!atomic_dec_and_test(&lp->buf_lock)) {312 /* already in this function */313 arc_printk(D_NORMAL, dev, "get_arcbuf: overlap (%d)!\n",314 lp->buf_lock.counter);315 } else { /* we can continue */316 if (lp->next_buf >= 5)317 lp->next_buf -= 5;318 319 if (lp->next_buf == lp->first_free_buf) {320 arc_printk(D_NORMAL, dev, "get_arcbuf: BUG: no buffers are available??\n");321 } else {322 buf = lp->buf_queue[lp->next_buf++];323 lp->next_buf %= 5;324 }325 }326 327 if (BUGLVL(D_DURING)) {328 arc_printk(D_DURING, dev, "get_arcbuf: got #%d; buffer queue is now: ",329 buf);330 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)331 arc_cont(D_DURING, "#%d ", lp->buf_queue[i]);332 arc_cont(D_DURING, "\n");333 }334 335 atomic_inc(&lp->buf_lock);336 return buf;337}338 339static int choose_mtu(void)340{341 int count, mtu = 65535;342 343 /* choose the smallest MTU of all available encaps */344 for (count = 0; count < 256; count++) {345 if (arc_proto_map[count] != &arc_proto_null &&346 arc_proto_map[count]->mtu < mtu) {347 mtu = arc_proto_map[count]->mtu;348 }349 }350 351 return mtu == 65535 ? XMTU : mtu;352}353 354static const struct header_ops arcnet_header_ops = {355 .create = arcnet_header,356};357 358static const struct net_device_ops arcnet_netdev_ops = {359 .ndo_open = arcnet_open,360 .ndo_stop = arcnet_close,361 .ndo_start_xmit = arcnet_send_packet,362 .ndo_tx_timeout = arcnet_timeout,363};364 365/* Setup a struct device for ARCnet. */366static void arcdev_setup(struct net_device *dev)367{368 dev->type = ARPHRD_ARCNET;369 dev->netdev_ops = &arcnet_netdev_ops;370 dev->header_ops = &arcnet_header_ops;371 dev->hard_header_len = sizeof(struct arc_hardware);372 dev->mtu = choose_mtu();373 374 dev->addr_len = ARCNET_ALEN;375 dev->tx_queue_len = 100;376 dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */377 dev->watchdog_timeo = TX_TIMEOUT;378 379 /* New-style flags. */380 dev->flags = IFF_BROADCAST;381}382 383static void arcnet_timer(struct timer_list *t)384{385 struct arcnet_local *lp = from_timer(lp, t, timer);386 struct net_device *dev = lp->dev;387 388 spin_lock_irq(&lp->lock);389 390 if (!lp->reset_in_progress && !netif_carrier_ok(dev)) {391 netif_carrier_on(dev);392 netdev_info(dev, "link up\n");393 }394 395 spin_unlock_irq(&lp->lock);396}397 398static void reset_device_work(struct work_struct *work)399{400 struct arcnet_local *lp;401 struct net_device *dev;402 403 lp = container_of(work, struct arcnet_local, reset_work);404 dev = lp->dev;405 406 /* Do not bring the network interface back up if an ifdown407 * was already done.408 */409 if (!netif_running(dev) || !lp->reset_in_progress)410 return;411 412 rtnl_lock();413 414 /* Do another check, in case of an ifdown that was triggered in415 * the small race window between the exit condition above and416 * acquiring RTNL.417 */418 if (!netif_running(dev) || !lp->reset_in_progress)419 goto out;420 421 dev_close(dev);422 dev_open(dev, NULL);423 424out:425 rtnl_unlock();426}427 428static void arcnet_reply_work(struct work_struct *t)429{430 struct arcnet_local *lp = from_work(lp, t, reply_work);431 432 struct sk_buff *ackskb, *skb;433 struct sock_exterr_skb *serr;434 struct sock *sk;435 int ret;436 437 local_irq_disable();438 skb = lp->outgoing.skb;439 if (!skb || !skb->sk) {440 local_irq_enable();441 return;442 }443 444 sock_hold(skb->sk);445 sk = skb->sk;446 ackskb = skb_clone_sk(skb);447 sock_put(skb->sk);448 449 if (!ackskb) {450 local_irq_enable();451 return;452 }453 454 serr = SKB_EXT_ERR(ackskb);455 memset(serr, 0, sizeof(*serr));456 serr->ee.ee_errno = ENOMSG;457 serr->ee.ee_origin = SO_EE_ORIGIN_TXSTATUS;458 serr->ee.ee_data = skb_shinfo(skb)->tskey;459 serr->ee.ee_info = lp->reply_status;460 461 /* finally erasing outgoing skb */462 dev_kfree_skb(lp->outgoing.skb);463 lp->outgoing.skb = NULL;464 465 ackskb->dev = lp->dev;466 467 ret = sock_queue_err_skb(sk, ackskb);468 if (ret)469 dev_kfree_skb_irq(ackskb);470 471 local_irq_enable();472};473 474struct net_device *alloc_arcdev(const char *name)475{476 struct net_device *dev;477 478 dev = alloc_netdev(sizeof(struct arcnet_local),479 name && *name ? name : "arc%d", NET_NAME_UNKNOWN,480 arcdev_setup);481 if (dev) {482 struct arcnet_local *lp = netdev_priv(dev);483 484 lp->dev = dev;485 spin_lock_init(&lp->lock);486 timer_setup(&lp->timer, arcnet_timer, 0);487 INIT_WORK(&lp->reset_work, reset_device_work);488 }489 490 return dev;491}492EXPORT_SYMBOL(alloc_arcdev);493 494void free_arcdev(struct net_device *dev)495{496 struct arcnet_local *lp = netdev_priv(dev);497 498 /* Do not cancel this at ->ndo_close(), as the workqueue itself499 * indirectly calls the ifdown path through dev_close().500 */501 cancel_work_sync(&lp->reset_work);502 free_netdev(dev);503}504EXPORT_SYMBOL(free_arcdev);505 506/* Open/initialize the board. This is called sometime after booting when507 * the 'ifconfig' program is run.508 *509 * This routine should set everything up anew at each open, even registers510 * that "should" only need to be set once at boot, so that there is511 * non-reboot way to recover if something goes wrong.512 */513int arcnet_open(struct net_device *dev)514{515 struct arcnet_local *lp = netdev_priv(dev);516 int count, newmtu, error;517 518 arc_printk(D_INIT, dev, "opened.");519 520 if (!try_module_get(lp->hw.owner))521 return -ENODEV;522 523 if (BUGLVL(D_PROTO)) {524 arc_printk(D_PROTO, dev, "protocol map (default is '%c'): ",525 arc_proto_default->suffix);526 for (count = 0; count < 256; count++)527 arc_cont(D_PROTO, "%c", arc_proto_map[count]->suffix);528 arc_cont(D_PROTO, "\n");529 }530 531 INIT_WORK(&lp->reply_work, arcnet_reply_work);532 533 arc_printk(D_INIT, dev, "arcnet_open: resetting card.\n");534 535 /* try to put the card in a defined state - if it fails the first536 * time, actually reset it.537 */538 error = -ENODEV;539 if (lp->hw.reset(dev, 0) && lp->hw.reset(dev, 1))540 goto out_module_put;541 542 newmtu = choose_mtu();543 if (newmtu < dev->mtu)544 dev->mtu = newmtu;545 546 arc_printk(D_INIT, dev, "arcnet_open: mtu: %d.\n", dev->mtu);547 548 /* autodetect the encapsulation for each host. */549 memset(lp->default_proto, 0, sizeof(lp->default_proto));550 551 /* the broadcast address is special - use the 'bcast' protocol */552 for (count = 0; count < 256; count++) {553 if (arc_proto_map[count] == arc_bcast_proto) {554 lp->default_proto[0] = count;555 break;556 }557 }558 559 /* initialize buffers */560 atomic_set(&lp->buf_lock, 1);561 562 lp->next_buf = lp->first_free_buf = 0;563 release_arcbuf(dev, 0);564 release_arcbuf(dev, 1);565 release_arcbuf(dev, 2);566 release_arcbuf(dev, 3);567 lp->cur_tx = lp->next_tx = -1;568 lp->cur_rx = -1;569 570 lp->rfc1201.sequence = 1;571 572 /* bring up the hardware driver */573 if (lp->hw.open)574 lp->hw.open(dev);575 576 if (dev->dev_addr[0] == 0)577 arc_printk(D_NORMAL, dev, "WARNING! Station address 00 is reserved for broadcasts!\n");578 else if (dev->dev_addr[0] == 255)579 arc_printk(D_NORMAL, dev, "WARNING! Station address FF may confuse DOS networking programs!\n");580 581 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);582 if (lp->hw.status(dev) & RESETflag) {583 arc_printk(D_DEBUG, dev, "%s: %d: %s\n",584 __FILE__, __LINE__, __func__);585 lp->hw.command(dev, CFLAGScmd | RESETclear);586 }587 588 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);589 /* make sure we're ready to receive IRQ's. */590 lp->hw.intmask(dev, 0);591 udelay(1); /* give it time to set the mask before592 * we reset it again. (may not even be593 * necessary)594 */595 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);596 lp->intmask = NORXflag | RECONflag;597 lp->hw.intmask(dev, lp->intmask);598 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);599 600 netif_carrier_off(dev);601 netif_start_queue(dev);602 mod_timer(&lp->timer, jiffies + msecs_to_jiffies(1000));603 604 arcnet_led_event(dev, ARCNET_LED_EVENT_OPEN);605 return 0;606 607 out_module_put:608 module_put(lp->hw.owner);609 return error;610}611EXPORT_SYMBOL(arcnet_open);612 613/* The inverse routine to arcnet_open - shuts down the card. */614int arcnet_close(struct net_device *dev)615{616 struct arcnet_local *lp = netdev_priv(dev);617 618 arcnet_led_event(dev, ARCNET_LED_EVENT_STOP);619 del_timer_sync(&lp->timer);620 621 netif_stop_queue(dev);622 netif_carrier_off(dev);623 624 cancel_work_sync(&lp->reply_work);625 626 /* flush TX and disable RX */627 lp->hw.intmask(dev, 0);628 lp->hw.command(dev, NOTXcmd); /* stop transmit */629 lp->hw.command(dev, NORXcmd); /* disable receive */630 mdelay(1);631 632 /* shut down the card */633 lp->hw.close(dev);634 635 /* reset counters */636 lp->reset_in_progress = 0;637 638 module_put(lp->hw.owner);639 return 0;640}641EXPORT_SYMBOL(arcnet_close);642 643static int arcnet_header(struct sk_buff *skb, struct net_device *dev,644 unsigned short type, const void *daddr,645 const void *saddr, unsigned len)646{647 const struct arcnet_local *lp = netdev_priv(dev);648 uint8_t _daddr, proto_num;649 struct ArcProto *proto;650 651 arc_printk(D_DURING, dev,652 "create header from %d to %d; protocol %d (%Xh); size %u.\n",653 saddr ? *(uint8_t *)saddr : -1,654 daddr ? *(uint8_t *)daddr : -1,655 type, type, len);656 657 if (skb->len != 0 && len != skb->len)658 arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",659 skb->len, len);660 661 /* Type is host order - ? */662 if (type == ETH_P_ARCNET) {663 proto = arc_raw_proto;664 arc_printk(D_DEBUG, dev, "arc_raw_proto used. proto='%c'\n",665 proto->suffix);666 _daddr = daddr ? *(uint8_t *)daddr : 0;667 } else if (!daddr) {668 /* if the dest addr isn't provided, we can't choose an669 * encapsulation! Store the packet type (eg. ETH_P_IP)670 * for now, and we'll push on a real header when we do671 * rebuild_header.672 */673 *(uint16_t *)skb_push(skb, 2) = type;674 /* XXX: Why not use skb->mac_len? */675 if (skb->network_header - skb->mac_header != 2)676 arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! diff (%u) is not 2!\n",677 skb->network_header - skb->mac_header);678 return -2; /* return error -- can't transmit yet! */679 } else {680 /* otherwise, we can just add the header as usual. */681 _daddr = *(uint8_t *)daddr;682 proto_num = lp->default_proto[_daddr];683 proto = arc_proto_map[proto_num];684 arc_printk(D_DURING, dev, "building header for %02Xh using protocol '%c'\n",685 proto_num, proto->suffix);686 if (proto == &arc_proto_null && arc_bcast_proto != proto) {687 arc_printk(D_DURING, dev, "actually, let's use '%c' instead.\n",688 arc_bcast_proto->suffix);689 proto = arc_bcast_proto;690 }691 }692 return proto->build_header(skb, dev, type, _daddr);693}694 695/* Called by the kernel in order to transmit a packet. */696netdev_tx_t arcnet_send_packet(struct sk_buff *skb,697 struct net_device *dev)698{699 struct arcnet_local *lp = netdev_priv(dev);700 struct archdr *pkt;701 struct arc_rfc1201 *soft;702 struct ArcProto *proto;703 int txbuf;704 unsigned long flags;705 int retval;706 707 arc_printk(D_DURING, dev,708 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",709 lp->hw.status(dev), lp->cur_tx, lp->next_tx, skb->len, skb->protocol);710 711 pkt = (struct archdr *)skb->data;712 soft = &pkt->soft.rfc1201;713 proto = arc_proto_map[soft->proto];714 715 arc_printk(D_SKB_SIZE, dev, "skb: transmitting %d bytes to %02X\n",716 skb->len, pkt->hard.dest);717 if (BUGLVL(D_SKB))718 arcnet_dump_skb(dev, skb, "tx");719 720 /* fits in one packet? */721 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {722 arc_printk(D_NORMAL, dev, "fixme: packet too large: compensating badly!\n");723 dev_kfree_skb(skb);724 return NETDEV_TX_OK; /* don't try again */725 }726 727 /* We're busy transmitting a packet... */728 netif_stop_queue(dev);729 730 spin_lock_irqsave(&lp->lock, flags);731 lp->hw.intmask(dev, 0);732 if (lp->next_tx == -1)733 txbuf = get_arcbuf(dev);734 else735 txbuf = -1;736 737 if (txbuf != -1) {738 lp->outgoing.skb = skb;739 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&740 !proto->ack_tx) {741 /* done right away and we don't want to acknowledge742 * the package later - forget about it now743 */744 dev->stats.tx_bytes += skb->len;745 } else {746 /* do it the 'split' way */747 lp->outgoing.proto = proto;748 lp->outgoing.skb = skb;749 lp->outgoing.pkt = pkt;750 751 if (proto->continue_tx &&752 proto->continue_tx(dev, txbuf)) {753 arc_printk(D_NORMAL, dev,754 "bug! continue_tx finished the first time! (proto='%c')\n",755 proto->suffix);756 }757 }758 retval = NETDEV_TX_OK;759 lp->next_tx = txbuf;760 } else {761 retval = NETDEV_TX_BUSY;762 }763 764 arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n",765 __FILE__, __LINE__, __func__, lp->hw.status(dev));766 /* make sure we didn't ignore a TX IRQ while we were in here */767 lp->hw.intmask(dev, 0);768 769 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);770 lp->intmask |= TXFREEflag | EXCNAKflag;771 lp->hw.intmask(dev, lp->intmask);772 arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n",773 __FILE__, __LINE__, __func__, lp->hw.status(dev));774 775 arcnet_led_event(dev, ARCNET_LED_EVENT_TX);776 777 spin_unlock_irqrestore(&lp->lock, flags);778 return retval; /* no need to try again */779}780EXPORT_SYMBOL(arcnet_send_packet);781 782/* Actually start transmitting a packet that was loaded into a buffer783 * by prepare_tx. This should _only_ be called by the interrupt handler.784 */785static int go_tx(struct net_device *dev)786{787 struct arcnet_local *lp = netdev_priv(dev);788 789 arc_printk(D_DURING, dev, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",790 lp->hw.status(dev), lp->intmask, lp->next_tx, lp->cur_tx);791 792 if (lp->cur_tx != -1 || lp->next_tx == -1)793 return 0;794 795 if (BUGLVL(D_TX))796 arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);797 798 lp->cur_tx = lp->next_tx;799 lp->next_tx = -1;800 801 /* start sending */802 lp->hw.command(dev, TXcmd | (lp->cur_tx << 3));803 804 dev->stats.tx_packets++;805 lp->lasttrans_dest = lp->lastload_dest;806 lp->lastload_dest = 0;807 lp->excnak_pending = 0;808 lp->intmask |= TXFREEflag | EXCNAKflag;809 810 return 1;811}812 813/* Called by the kernel when transmit times out */814void arcnet_timeout(struct net_device *dev, unsigned int txqueue)815{816 unsigned long flags;817 struct arcnet_local *lp = netdev_priv(dev);818 int status = lp->hw.status(dev);819 char *msg;820 821 spin_lock_irqsave(&lp->lock, flags);822 if (status & TXFREEflag) { /* transmit _DID_ finish */823 msg = " - missed IRQ?";824 } else {825 msg = "";826 dev->stats.tx_aborted_errors++;827 lp->timed_out = 1;828 lp->hw.command(dev, NOTXcmd | (lp->cur_tx << 3));829 }830 dev->stats.tx_errors++;831 832 /* make sure we didn't miss a TX or a EXC NAK IRQ */833 lp->hw.intmask(dev, 0);834 lp->intmask |= TXFREEflag | EXCNAKflag;835 lp->hw.intmask(dev, lp->intmask);836 837 spin_unlock_irqrestore(&lp->lock, flags);838 839 if (time_after(jiffies, lp->last_timeout + 10 * HZ)) {840 arc_printk(D_EXTRA, dev, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",841 msg, status, lp->intmask, lp->lasttrans_dest);842 lp->last_timeout = jiffies;843 }844 845 if (lp->cur_tx == -1)846 netif_wake_queue(dev);847}848EXPORT_SYMBOL(arcnet_timeout);849 850/* The typical workload of the driver: Handle the network interface851 * interrupts. Establish which device needs attention, and call the correct852 * chipset interrupt handler.853 */854irqreturn_t arcnet_interrupt(int irq, void *dev_id)855{856 struct net_device *dev = dev_id;857 struct arcnet_local *lp;858 int recbuf, status, diagstatus, didsomething, boguscount;859 unsigned long flags;860 int retval = IRQ_NONE;861 862 arc_printk(D_DURING, dev, "\n");863 864 arc_printk(D_DURING, dev, "in arcnet_interrupt\n");865 866 lp = netdev_priv(dev);867 BUG_ON(!lp);868 869 spin_lock_irqsave(&lp->lock, flags);870 871 if (lp->reset_in_progress)872 goto out;873 874 /* RESET flag was enabled - if device is not running, we must875 * clear it right away (but nothing else).876 */877 if (!netif_running(dev)) {878 if (lp->hw.status(dev) & RESETflag)879 lp->hw.command(dev, CFLAGScmd | RESETclear);880 lp->hw.intmask(dev, 0);881 spin_unlock_irqrestore(&lp->lock, flags);882 return retval;883 }884 885 arc_printk(D_DURING, dev, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",886 lp->hw.status(dev), lp->intmask);887 888 boguscount = 5;889 do {890 status = lp->hw.status(dev);891 diagstatus = (status >> 8) & 0xFF;892 893 arc_printk(D_DEBUG, dev, "%s: %d: %s: status=%x\n",894 __FILE__, __LINE__, __func__, status);895 didsomething = 0;896 897 /* RESET flag was enabled - card is resetting and if RX is898 * disabled, it's NOT because we just got a packet.899 *900 * The card is in an undefined state.901 * Clear it out and start over.902 */903 if (status & RESETflag) {904 arc_printk(D_NORMAL, dev, "spurious reset (status=%Xh)\n",905 status);906 907 lp->reset_in_progress = 1;908 netif_stop_queue(dev);909 netif_carrier_off(dev);910 schedule_work(&lp->reset_work);911 912 /* get out of the interrupt handler! */913 goto out;914 }915 /* RX is inhibited - we must have received something.916 * Prepare to receive into the next buffer.917 *918 * We don't actually copy the received packet from the card919 * until after the transmit handler runs (and possibly920 * launches the next tx); this should improve latency slightly921 * if we get both types of interrupts at once.922 */923 recbuf = -1;924 if (status & lp->intmask & NORXflag) {925 recbuf = lp->cur_rx;926 arc_printk(D_DURING, dev, "Buffer #%d: receive irq (status=%Xh)\n",927 recbuf, status);928 929 lp->cur_rx = get_arcbuf(dev);930 if (lp->cur_rx != -1) {931 arc_printk(D_DURING, dev, "enabling receive to buffer #%d\n",932 lp->cur_rx);933 lp->hw.command(dev, RXcmd | (lp->cur_rx << 3) | RXbcasts);934 }935 didsomething++;936 }937 938 if ((diagstatus & EXCNAKflag)) {939 arc_printk(D_DURING, dev, "EXCNAK IRQ (diagstat=%Xh)\n",940 diagstatus);941 942 lp->hw.command(dev, NOTXcmd); /* disable transmit */943 lp->excnak_pending = 1;944 945 lp->hw.command(dev, EXCNAKclear);946 lp->intmask &= ~(EXCNAKflag);947 didsomething++;948 }949 950 /* a transmit finished, and we're interested in it. */951 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {952 int ackstatus;953 lp->intmask &= ~(TXFREEflag | EXCNAKflag);954 955 if (status & TXACKflag)956 ackstatus = 2;957 else if (lp->excnak_pending)958 ackstatus = 1;959 else960 ackstatus = 0;961 962 arc_printk(D_DURING, dev, "TX IRQ (stat=%Xh)\n",963 status);964 965 if (lp->cur_tx != -1 && !lp->timed_out) {966 if (!(status & TXACKflag)) {967 if (lp->lasttrans_dest != 0) {968 arc_printk(D_EXTRA, dev,969 "transmit was not acknowledged! (status=%Xh, dest=%02Xh)\n",970 status,971 lp->lasttrans_dest);972 dev->stats.tx_errors++;973 dev->stats.tx_carrier_errors++;974 } else {975 arc_printk(D_DURING, dev,976 "broadcast was not acknowledged; that's normal (status=%Xh, dest=%02Xh)\n",977 status,978 lp->lasttrans_dest);979 }980 }981 982 if (lp->outgoing.proto &&983 lp->outgoing.proto->ack_tx) {984 lp->outgoing.proto985 ->ack_tx(dev, ackstatus);986 }987 lp->reply_status = ackstatus;988 queue_work(system_bh_highpri_wq, &lp->reply_work);989 }990 if (lp->cur_tx != -1)991 release_arcbuf(dev, lp->cur_tx);992 993 lp->cur_tx = -1;994 lp->timed_out = 0;995 didsomething++;996 997 /* send another packet if there is one */998 go_tx(dev);999 1000 /* continue a split packet, if any */1001 if (lp->outgoing.proto &&1002 lp->outgoing.proto->continue_tx) {1003 int txbuf = get_arcbuf(dev);1004 1005 if (txbuf != -1) {1006 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {1007 /* that was the last segment */1008 dev->stats.tx_bytes += lp->outgoing.skb->len;1009 if (!lp->outgoing.proto->ack_tx) {1010 dev_kfree_skb_irq(lp->outgoing.skb);1011 lp->outgoing.proto = NULL;1012 }1013 }1014 lp->next_tx = txbuf;1015 }1016 }1017 /* inform upper layers of idleness, if necessary */1018 if (lp->cur_tx == -1)1019 netif_wake_queue(dev);1020 }1021 /* now process the received packet, if any */1022 if (recbuf != -1) {1023 if (BUGLVL(D_RX))1024 arcnet_dump_packet(dev, recbuf, "rx irq", 0);1025 1026 arcnet_rx(dev, recbuf);1027 release_arcbuf(dev, recbuf);1028 1029 didsomething++;1030 }1031 if (status & lp->intmask & RECONflag) {1032 lp->hw.command(dev, CFLAGScmd | CONFIGclear);1033 dev->stats.tx_carrier_errors++;1034 1035 arc_printk(D_RECON, dev, "Network reconfiguration detected (status=%Xh)\n",1036 status);1037 if (netif_carrier_ok(dev)) {1038 netif_carrier_off(dev);1039 netdev_info(dev, "link down\n");1040 }1041 mod_timer(&lp->timer, jiffies + msecs_to_jiffies(1000));1042 1043 arcnet_led_event(dev, ARCNET_LED_EVENT_RECON);1044 /* MYRECON bit is at bit 7 of diagstatus */1045 if (diagstatus & 0x80)1046 arc_printk(D_RECON, dev, "Put out that recon myself\n");1047 1048 /* is the RECON info empty or old? */1049 if (!lp->first_recon || !lp->last_recon ||1050 time_after(jiffies, lp->last_recon + HZ * 10)) {1051 if (lp->network_down)1052 arc_printk(D_NORMAL, dev, "reconfiguration detected: cabling restored?\n");1053 lp->first_recon = lp->last_recon = jiffies;1054 lp->num_recons = lp->network_down = 0;1055 1056 arc_printk(D_DURING, dev, "recon: clearing counters.\n");1057 } else { /* add to current RECON counter */1058 lp->last_recon = jiffies;1059 lp->num_recons++;1060 1061 arc_printk(D_DURING, dev, "recon: counter=%d, time=%lds, net=%d\n",1062 lp->num_recons,1063 (lp->last_recon - lp->first_recon) / HZ,1064 lp->network_down);1065 1066 /* if network is marked up;1067 * and first_recon and last_recon are 60+ apart;1068 * and the average no. of recons counted is1069 * > RECON_THRESHOLD/min;1070 * then print a warning message.1071 */1072 if (!lp->network_down &&1073 (lp->last_recon - lp->first_recon) <= HZ * 60 &&1074 lp->num_recons >= RECON_THRESHOLD) {1075 lp->network_down = 1;1076 arc_printk(D_NORMAL, dev, "many reconfigurations detected: cabling problem?\n");1077 } else if (!lp->network_down &&1078 lp->last_recon - lp->first_recon > HZ * 60) {1079 /* reset counters if we've gone for1080 * over a minute.1081 */1082 lp->first_recon = lp->last_recon;1083 lp->num_recons = 1;1084 }1085 }1086 } else if (lp->network_down &&1087 time_after(jiffies, lp->last_recon + HZ * 10)) {1088 if (lp->network_down)1089 arc_printk(D_NORMAL, dev, "cabling restored?\n");1090 lp->first_recon = lp->last_recon = 0;1091 lp->num_recons = lp->network_down = 0;1092 1093 arc_printk(D_DURING, dev, "not recon: clearing counters anyway.\n");1094 netif_carrier_on(dev);1095 }1096 1097 if (didsomething)1098 retval |= IRQ_HANDLED;1099 } while (--boguscount && didsomething);1100 1101 arc_printk(D_DURING, dev, "arcnet_interrupt complete (status=%Xh, count=%d)\n",1102 lp->hw.status(dev), boguscount);1103 arc_printk(D_DURING, dev, "\n");1104 1105 lp->hw.intmask(dev, 0);1106 udelay(1);1107 lp->hw.intmask(dev, lp->intmask);1108 1109out:1110 spin_unlock_irqrestore(&lp->lock, flags);1111 return retval;1112}1113EXPORT_SYMBOL(arcnet_interrupt);1114 1115/* This is a generic packet receiver that calls arcnet??_rx depending on the1116 * protocol ID found.1117 */1118static void arcnet_rx(struct net_device *dev, int bufnum)1119{1120 struct arcnet_local *lp = netdev_priv(dev);1121 union {1122 struct archdr pkt;1123 char buf[512];1124 } rxdata;1125 struct arc_rfc1201 *soft;1126 int length, ofs;1127 1128 soft = &rxdata.pkt.soft.rfc1201;1129 1130 lp->hw.copy_from_card(dev, bufnum, 0, &rxdata.pkt, ARC_HDR_SIZE);1131 if (rxdata.pkt.hard.offset[0]) {1132 ofs = rxdata.pkt.hard.offset[0];1133 length = 256 - ofs;1134 } else {1135 ofs = rxdata.pkt.hard.offset[1];1136 length = 512 - ofs;1137 }1138 1139 /* get the full header, if possible */1140 if (sizeof(rxdata.pkt.soft) <= length) {1141 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(rxdata.pkt.soft));1142 } else {1143 memset(&rxdata.pkt.soft, 0, sizeof(rxdata.pkt.soft));1144 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);1145 }1146 1147 arc_printk(D_DURING, dev, "Buffer #%d: received packet from %02Xh to %02Xh (%d+4 bytes)\n",1148 bufnum, rxdata.pkt.hard.source, rxdata.pkt.hard.dest, length);1149 1150 dev->stats.rx_packets++;1151 dev->stats.rx_bytes += length + ARC_HDR_SIZE;1152 1153 /* call the right receiver for the protocol */1154 if (arc_proto_map[soft->proto]->is_ip) {1155 if (BUGLVL(D_PROTO)) {1156 struct ArcProto1157 *oldp = arc_proto_map[lp->default_proto[rxdata.pkt.hard.source]],1158 *newp = arc_proto_map[soft->proto];1159 1160 if (oldp != newp) {1161 arc_printk(D_PROTO, dev,1162 "got protocol %02Xh; encap for host %02Xh is now '%c' (was '%c')\n",1163 soft->proto, rxdata.pkt.hard.source,1164 newp->suffix, oldp->suffix);1165 }1166 }1167 1168 /* broadcasts will always be done with the last-used encap. */1169 lp->default_proto[0] = soft->proto;1170 1171 /* in striking contrast, the following isn't a hack. */1172 lp->default_proto[rxdata.pkt.hard.source] = soft->proto;1173 }1174 /* call the protocol-specific receiver. */1175 arc_proto_map[soft->proto]->rx(dev, bufnum, &rxdata.pkt, length);1176}1177 1178static void null_rx(struct net_device *dev, int bufnum,1179 struct archdr *pkthdr, int length)1180{1181 arc_printk(D_PROTO, dev,1182 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",1183 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);1184}1185 1186static int null_build_header(struct sk_buff *skb, struct net_device *dev,1187 unsigned short type, uint8_t daddr)1188{1189 struct arcnet_local *lp = netdev_priv(dev);1190 1191 arc_printk(D_PROTO, dev,1192 "tx: can't build header for encap %02Xh; load a protocol driver.\n",1193 lp->default_proto[daddr]);1194 1195 /* always fails */1196 return 0;1197}1198 1199/* the "do nothing" prepare_tx function warns that there's nothing to do. */1200static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,1201 int length, int bufnum)1202{1203 struct arcnet_local *lp = netdev_priv(dev);1204 struct arc_hardware newpkt;1205 1206 arc_printk(D_PROTO, dev, "tx: no encap for this host; load a protocol driver.\n");1207 1208 /* send a packet to myself -- will never get received, of course */1209 newpkt.source = newpkt.dest = dev->dev_addr[0];1210 1211 /* only one byte of actual data (and it's random) */1212 newpkt.offset[0] = 0xFF;1213 1214 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);1215 1216 return 1; /* done */1217}1218