1 /* 2 * Linux ARCnet driver - device-independent routines 3 * 4 * Written 1997 by David Woodhouse. 5 * Written 1994-1999 by Avery Pennarun. 6 * Written 1999-2000 by Martin Mares <[email protected]>. 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 the 18 * Director, National Security Agency. This software may only be used 19 * and distributed according to the terms of the GNU General Public License as 20 * 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 by 29 * Donald Becker - it didn't work :) 30 * - skeleton.c v0.05 dated 11/16/93 by Donald Becker 31 * (from Linux Kernel 1.1.45) 32 * - RFC's 1201 and 1051 - re: TCP/IP over ARCnet 33 * - The official ARCnet COM9026 data sheets (!) thanks to 34 * Ken Cornetet <[email protected]> 35 * - The official ARCnet COM20020 data sheets. 36 * - Information on some more obscure ARCnet controller chips, thanks 37 * 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 <[email protected]> 40 * - Textual information and more alternate source from Joachim Koenig 41 * <[email protected]> 42 */ 43 44 #define VERSION "arcnet: v3.94 BETA 2007/02/08 - by Avery Pennarun et al.\n" 45 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/arcdevice.h> 54 #include <linux/jiffies.h> 55 56 /* "do nothing" functions for protocol drivers */ 57 static void null_rx(struct net_device *dev, int bufnum, 58 struct archdr *pkthdr, int length); 59 static int null_build_header(struct sk_buff *skb, struct net_device *dev, 60 unsigned short type, uint8_t daddr); 61 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, 62 int length, int bufnum); 63 64 static void arcnet_rx(struct net_device *dev, int bufnum); 65 66 /* one ArcProto per possible proto ID. None of the elements of 67 * arc_proto_map are allowed to be NULL; they will get set to 68 * arc_proto_default instead. It also must not be NULL; if you would like 69 * to set it to NULL, set it to &arc_proto_null instead. 70 */ 71 struct ArcProto *arc_proto_map[256], *arc_proto_default, 72 *arc_bcast_proto, *arc_raw_proto; 73 74 static struct ArcProto arc_proto_null = { 75 .suffix = '?', 76 .mtu = XMTU, 77 .is_ip = 0, 78 .rx = null_rx, 79 .build_header = null_build_header, 80 .prepare_tx = null_prepare_tx, 81 .continue_tx = NULL, 82 .ack_tx = NULL 83 }; 84 85 /* Exported function prototypes */ 86 int arcnet_debug = ARCNET_DEBUG; 87 88 EXPORT_SYMBOL(arc_proto_map); 89 EXPORT_SYMBOL(arc_proto_default); 90 EXPORT_SYMBOL(arc_bcast_proto); 91 EXPORT_SYMBOL(arc_raw_proto); 92 EXPORT_SYMBOL(arcnet_unregister_proto); 93 EXPORT_SYMBOL(arcnet_debug); 94 EXPORT_SYMBOL(alloc_arcdev); 95 EXPORT_SYMBOL(arcnet_interrupt); 96 EXPORT_SYMBOL(arcnet_open); 97 EXPORT_SYMBOL(arcnet_close); 98 EXPORT_SYMBOL(arcnet_send_packet); 99 EXPORT_SYMBOL(arcnet_timeout); 100 101 /* Internal function prototypes */ 102 static int arcnet_header(struct sk_buff *skb, struct net_device *dev, 103 unsigned short type, const void *daddr, 104 const void *saddr, unsigned len); 105 static int go_tx(struct net_device *dev); 106 107 static int debug = ARCNET_DEBUG; 108 module_param(debug, int, 0); 109 MODULE_LICENSE("GPL"); 110 111 static int __init arcnet_init(void) 112 { 113 int count; 114 115 arcnet_debug = debug; 116 117 printk("arcnet loaded.\n"); 118 119 #ifdef ALPHA_WARNING 120 if (BUGLVL(D_EXTRA)) { 121 printk("arcnet: ***\n" 122 "arcnet: * Read arcnet.txt for important release notes!\n" 123 "arcnet: *\n" 124 "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n" 125 "arcnet: * me if you have any questions, comments, or bug reports.\n" 126 "arcnet: ***\n"); 127 } 128 #endif 129 130 /* initialize the protocol map */ 131 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null; 132 for (count = 0; count < 256; count++) 133 arc_proto_map[count] = arc_proto_default; 134 135 if (BUGLVL(D_DURING)) 136 printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n", 137 sizeof(struct arc_hardware), sizeof(struct arc_rfc1201), 138 sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap), 139 sizeof(struct archdr)); 140 141 return 0; 142 } 143 144 static void __exit arcnet_exit(void) 145 { 146 } 147 148 module_init(arcnet_init); 149 module_exit(arcnet_exit); 150 151 /* Dump the contents of an sk_buff */ 152 #if ARCNET_DEBUG_MAX & D_SKB 153 void arcnet_dump_skb(struct net_device *dev, 154 struct sk_buff *skb, char *desc) 155 { 156 char hdr[32]; 157 158 /* dump the packet */ 159 snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc); 160 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET, 161 16, 1, skb->data, skb->len, true); 162 } 163 164 EXPORT_SYMBOL(arcnet_dump_skb); 165 #endif 166 167 /* Dump the contents of an ARCnet buffer */ 168 #if (ARCNET_DEBUG_MAX & (D_RX | D_TX)) 169 static void arcnet_dump_packet(struct net_device *dev, int bufnum, 170 char *desc, int take_arcnet_lock) 171 { 172 struct arcnet_local *lp = netdev_priv(dev); 173 int i, length; 174 unsigned long flags = 0; 175 static uint8_t buf[512]; 176 char hdr[32]; 177 178 /* hw.copy_from_card expects IRQ context so take the IRQ lock 179 * to keep it single threaded 180 */ 181 if (take_arcnet_lock) 182 spin_lock_irqsave(&lp->lock, flags); 183 184 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512); 185 if (take_arcnet_lock) 186 spin_unlock_irqrestore(&lp->lock, flags); 187 188 /* if the offset[0] byte is nonzero, this is a 256-byte packet */ 189 length = (buf[2] ? 256 : 512); 190 191 /* dump the packet */ 192 snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc); 193 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET, 194 16, 1, buf, length, true); 195 } 196 197 #else 198 199 #define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) do { } while (0) 200 201 #endif 202 203 /* Unregister a protocol driver from the arc_proto_map. Protocol drivers 204 * are responsible for registering themselves, but the unregister routine 205 * is pretty generic so we'll do it here. 206 */ 207 void arcnet_unregister_proto(struct ArcProto *proto) 208 { 209 int count; 210 211 if (arc_proto_default == proto) 212 arc_proto_default = &arc_proto_null; 213 if (arc_bcast_proto == proto) 214 arc_bcast_proto = arc_proto_default; 215 if (arc_raw_proto == proto) 216 arc_raw_proto = arc_proto_default; 217 218 for (count = 0; count < 256; count++) { 219 if (arc_proto_map[count] == proto) 220 arc_proto_map[count] = arc_proto_default; 221 } 222 } 223 224 /* Add a buffer to the queue. Only the interrupt handler is allowed to do 225 * this, unless interrupts are disabled. 226 * 227 * Note: we don't check for a full queue, since there aren't enough buffers 228 * to more than fill it. 229 */ 230 static void release_arcbuf(struct net_device *dev, int bufnum) 231 { 232 struct arcnet_local *lp = netdev_priv(dev); 233 int i; 234 235 lp->buf_queue[lp->first_free_buf++] = bufnum; 236 lp->first_free_buf %= 5; 237 238 if (BUGLVL(D_DURING)) { 239 BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ", 240 bufnum); 241 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5) 242 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]); 243 BUGMSG2(D_DURING, "\n"); 244 } 245 } 246 247 /* Get a buffer from the queue. 248 * If this returns -1, there are no buffers available. 249 */ 250 static int get_arcbuf(struct net_device *dev) 251 { 252 struct arcnet_local *lp = netdev_priv(dev); 253 int buf = -1, i; 254 255 if (!atomic_dec_and_test(&lp->buf_lock)) { 256 /* already in this function */ 257 BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n", 258 lp->buf_lock.counter); 259 } else { /* we can continue */ 260 if (lp->next_buf >= 5) 261 lp->next_buf -= 5; 262 263 if (lp->next_buf == lp->first_free_buf) { 264 BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n"); 265 } else { 266 buf = lp->buf_queue[lp->next_buf++]; 267 lp->next_buf %= 5; 268 } 269 } 270 271 if (BUGLVL(D_DURING)) { 272 BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf); 273 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5) 274 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]); 275 BUGMSG2(D_DURING, "\n"); 276 } 277 278 atomic_inc(&lp->buf_lock); 279 return buf; 280 } 281 282 static int choose_mtu(void) 283 { 284 int count, mtu = 65535; 285 286 /* choose the smallest MTU of all available encaps */ 287 for (count = 0; count < 256; count++) { 288 if (arc_proto_map[count] != &arc_proto_null && 289 arc_proto_map[count]->mtu < mtu) { 290 mtu = arc_proto_map[count]->mtu; 291 } 292 } 293 294 return mtu == 65535 ? XMTU : mtu; 295 } 296 297 static const struct header_ops arcnet_header_ops = { 298 .create = arcnet_header, 299 }; 300 301 static const struct net_device_ops arcnet_netdev_ops = { 302 .ndo_open = arcnet_open, 303 .ndo_stop = arcnet_close, 304 .ndo_start_xmit = arcnet_send_packet, 305 .ndo_tx_timeout = arcnet_timeout, 306 }; 307 308 /* Setup a struct device for ARCnet. */ 309 static void arcdev_setup(struct net_device *dev) 310 { 311 dev->type = ARPHRD_ARCNET; 312 dev->netdev_ops = &arcnet_netdev_ops; 313 dev->header_ops = &arcnet_header_ops; 314 dev->hard_header_len = sizeof(struct archdr); 315 dev->mtu = choose_mtu(); 316 317 dev->addr_len = ARCNET_ALEN; 318 dev->tx_queue_len = 100; 319 dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */ 320 dev->watchdog_timeo = TX_TIMEOUT; 321 322 /* New-style flags. */ 323 dev->flags = IFF_BROADCAST; 324 } 325 326 struct net_device *alloc_arcdev(const char *name) 327 { 328 struct net_device *dev; 329 330 dev = alloc_netdev(sizeof(struct arcnet_local), 331 name && *name ? name : "arc%d", NET_NAME_UNKNOWN, 332 arcdev_setup); 333 if (dev) { 334 struct arcnet_local *lp = netdev_priv(dev); 335 336 spin_lock_init(&lp->lock); 337 } 338 339 return dev; 340 } 341 342 /* Open/initialize the board. This is called sometime after booting when 343 * the 'ifconfig' program is run. 344 * 345 * This routine should set everything up anew at each open, even registers 346 * that "should" only need to be set once at boot, so that there is 347 * non-reboot way to recover if something goes wrong. 348 */ 349 int arcnet_open(struct net_device *dev) 350 { 351 struct arcnet_local *lp = netdev_priv(dev); 352 int count, newmtu, error; 353 354 BUGMSG(D_INIT, "opened."); 355 356 if (!try_module_get(lp->hw.owner)) 357 return -ENODEV; 358 359 if (BUGLVL(D_PROTO)) { 360 BUGMSG(D_PROTO, "protocol map (default is '%c'): ", 361 arc_proto_default->suffix); 362 for (count = 0; count < 256; count++) 363 BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix); 364 BUGMSG2(D_PROTO, "\n"); 365 } 366 367 BUGMSG(D_INIT, "arcnet_open: resetting card.\n"); 368 369 /* try to put the card in a defined state - if it fails the first 370 * time, actually reset it. 371 */ 372 error = -ENODEV; 373 if (ARCRESET(0) && ARCRESET(1)) 374 goto out_module_put; 375 376 newmtu = choose_mtu(); 377 if (newmtu < dev->mtu) 378 dev->mtu = newmtu; 379 380 BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu); 381 382 /* autodetect the encapsulation for each host. */ 383 memset(lp->default_proto, 0, sizeof(lp->default_proto)); 384 385 /* the broadcast address is special - use the 'bcast' protocol */ 386 for (count = 0; count < 256; count++) { 387 if (arc_proto_map[count] == arc_bcast_proto) { 388 lp->default_proto[0] = count; 389 break; 390 } 391 } 392 393 /* initialize buffers */ 394 atomic_set(&lp->buf_lock, 1); 395 396 lp->next_buf = lp->first_free_buf = 0; 397 release_arcbuf(dev, 0); 398 release_arcbuf(dev, 1); 399 release_arcbuf(dev, 2); 400 release_arcbuf(dev, 3); 401 lp->cur_tx = lp->next_tx = -1; 402 lp->cur_rx = -1; 403 404 lp->rfc1201.sequence = 1; 405 406 /* bring up the hardware driver */ 407 if (lp->hw.open) 408 lp->hw.open(dev); 409 410 if (dev->dev_addr[0] == 0) 411 BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved for broadcasts!\n"); 412 else if (dev->dev_addr[0] == 255) 413 BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse DOS networking programs!\n"); 414 415 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__); 416 if (ASTATUS() & RESETflag) { 417 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__); 418 ACOMMAND(CFLAGScmd | RESETclear); 419 } 420 421 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__); 422 /* make sure we're ready to receive IRQ's. */ 423 AINTMASK(0); 424 udelay(1); /* give it time to set the mask before 425 * we reset it again. (may not even be 426 * necessary) 427 */ 428 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__); 429 lp->intmask = NORXflag | RECONflag; 430 AINTMASK(lp->intmask); 431 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__); 432 433 netif_start_queue(dev); 434 435 return 0; 436 437 out_module_put: 438 module_put(lp->hw.owner); 439 return error; 440 } 441 442 /* The inverse routine to arcnet_open - shuts down the card. */ 443 int arcnet_close(struct net_device *dev) 444 { 445 struct arcnet_local *lp = netdev_priv(dev); 446 447 netif_stop_queue(dev); 448 449 /* flush TX and disable RX */ 450 AINTMASK(0); 451 ACOMMAND(NOTXcmd); /* stop transmit */ 452 ACOMMAND(NORXcmd); /* disable receive */ 453 mdelay(1); 454 455 /* shut down the card */ 456 lp->hw.close(dev); 457 module_put(lp->hw.owner); 458 return 0; 459 } 460 461 static int arcnet_header(struct sk_buff *skb, struct net_device *dev, 462 unsigned short type, const void *daddr, 463 const void *saddr, unsigned len) 464 { 465 const struct arcnet_local *lp = netdev_priv(dev); 466 uint8_t _daddr, proto_num; 467 struct ArcProto *proto; 468 469 BUGMSG(D_DURING, 470 "create header from %d to %d; protocol %d (%Xh); size %u.\n", 471 saddr ? *(uint8_t *)saddr : -1, 472 daddr ? *(uint8_t *)daddr : -1, 473 type, type, len); 474 475 if (skb->len != 0 && len != skb->len) 476 BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n", 477 skb->len, len); 478 479 /* Type is host order - ? */ 480 if (type == ETH_P_ARCNET) { 481 proto = arc_raw_proto; 482 BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n", proto->suffix); 483 _daddr = daddr ? *(uint8_t *)daddr : 0; 484 } else if (!daddr) { 485 /* if the dest addr isn't provided, we can't choose an 486 * encapsulation! Store the packet type (eg. ETH_P_IP) 487 * for now, and we'll push on a real header when we do 488 * rebuild_header. 489 */ 490 *(uint16_t *)skb_push(skb, 2) = type; 491 /* XXX: Why not use skb->mac_len? */ 492 if (skb->network_header - skb->mac_header != 2) 493 BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n", 494 (int)(skb->network_header - skb->mac_header)); 495 return -2; /* return error -- can't transmit yet! */ 496 } else { 497 /* otherwise, we can just add the header as usual. */ 498 _daddr = *(uint8_t *)daddr; 499 proto_num = lp->default_proto[_daddr]; 500 proto = arc_proto_map[proto_num]; 501 BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'\n", 502 proto_num, proto->suffix); 503 if (proto == &arc_proto_null && arc_bcast_proto != proto) { 504 BUGMSG(D_DURING, "actually, let's use '%c' instead.\n", 505 arc_bcast_proto->suffix); 506 proto = arc_bcast_proto; 507 } 508 } 509 return proto->build_header(skb, dev, type, _daddr); 510 } 511 512 /* Called by the kernel in order to transmit a packet. */ 513 netdev_tx_t arcnet_send_packet(struct sk_buff *skb, 514 struct net_device *dev) 515 { 516 struct arcnet_local *lp = netdev_priv(dev); 517 struct archdr *pkt; 518 struct arc_rfc1201 *soft; 519 struct ArcProto *proto; 520 int txbuf; 521 unsigned long flags; 522 int freeskb, retval; 523 524 BUGMSG(D_DURING, 525 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n", 526 ASTATUS(), lp->cur_tx, lp->next_tx, skb->len, skb->protocol); 527 528 pkt = (struct archdr *)skb->data; 529 soft = &pkt->soft.rfc1201; 530 proto = arc_proto_map[soft->proto]; 531 532 BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n", 533 skb->len, pkt->hard.dest); 534 if (BUGLVL(D_SKB)) 535 arcnet_dump_skb(dev, skb, "tx"); 536 537 /* fits in one packet? */ 538 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) { 539 BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n"); 540 dev_kfree_skb(skb); 541 return NETDEV_TX_OK; /* don't try again */ 542 } 543 544 /* We're busy transmitting a packet... */ 545 netif_stop_queue(dev); 546 547 spin_lock_irqsave(&lp->lock, flags); 548 AINTMASK(0); 549 if (lp->next_tx == -1) 550 txbuf = get_arcbuf(dev); 551 else 552 txbuf = -1; 553 554 if (txbuf != -1) { 555 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) && 556 !proto->ack_tx) { 557 /* done right away and we don't want to acknowledge 558 * the package later - forget about it now 559 */ 560 dev->stats.tx_bytes += skb->len; 561 freeskb = 1; 562 } else { 563 /* do it the 'split' way */ 564 lp->outgoing.proto = proto; 565 lp->outgoing.skb = skb; 566 lp->outgoing.pkt = pkt; 567 568 freeskb = 0; 569 570 if (proto->continue_tx && 571 proto->continue_tx(dev, txbuf)) { 572 BUGMSG(D_NORMAL, 573 "bug! continue_tx finished the first time! (proto='%c')\n", 574 proto->suffix); 575 } 576 } 577 retval = NETDEV_TX_OK; 578 lp->next_tx = txbuf; 579 } else { 580 retval = NETDEV_TX_BUSY; 581 freeskb = 0; 582 } 583 584 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n", __FILE__, __LINE__, __func__, ASTATUS()); 585 /* make sure we didn't ignore a TX IRQ while we were in here */ 586 AINTMASK(0); 587 588 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__); 589 lp->intmask |= TXFREEflag | EXCNAKflag; 590 AINTMASK(lp->intmask); 591 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n", __FILE__, __LINE__, __func__, ASTATUS()); 592 593 spin_unlock_irqrestore(&lp->lock, flags); 594 if (freeskb) 595 dev_kfree_skb(skb); 596 597 return retval; /* no need to try again */ 598 } 599 600 /* Actually start transmitting a packet that was loaded into a buffer 601 * by prepare_tx. This should _only_ be called by the interrupt handler. 602 */ 603 static int go_tx(struct net_device *dev) 604 { 605 struct arcnet_local *lp = netdev_priv(dev); 606 607 BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n", 608 ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx); 609 610 if (lp->cur_tx != -1 || lp->next_tx == -1) 611 return 0; 612 613 if (BUGLVL(D_TX)) 614 arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0); 615 616 lp->cur_tx = lp->next_tx; 617 lp->next_tx = -1; 618 619 /* start sending */ 620 ACOMMAND(TXcmd | (lp->cur_tx << 3)); 621 622 dev->stats.tx_packets++; 623 lp->lasttrans_dest = lp->lastload_dest; 624 lp->lastload_dest = 0; 625 lp->excnak_pending = 0; 626 lp->intmask |= TXFREEflag | EXCNAKflag; 627 628 return 1; 629 } 630 631 /* Called by the kernel when transmit times out */ 632 void arcnet_timeout(struct net_device *dev) 633 { 634 unsigned long flags; 635 struct arcnet_local *lp = netdev_priv(dev); 636 int status = ASTATUS(); 637 char *msg; 638 639 spin_lock_irqsave(&lp->lock, flags); 640 if (status & TXFREEflag) { /* transmit _DID_ finish */ 641 msg = " - missed IRQ?"; 642 } else { 643 msg = ""; 644 dev->stats.tx_aborted_errors++; 645 lp->timed_out = 1; 646 ACOMMAND(NOTXcmd | (lp->cur_tx << 3)); 647 } 648 dev->stats.tx_errors++; 649 650 /* make sure we didn't miss a TX or a EXC NAK IRQ */ 651 AINTMASK(0); 652 lp->intmask |= TXFREEflag | EXCNAKflag; 653 AINTMASK(lp->intmask); 654 655 spin_unlock_irqrestore(&lp->lock, flags); 656 657 if (time_after(jiffies, lp->last_timeout + 10 * HZ)) { 658 BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n", 659 msg, status, lp->intmask, lp->lasttrans_dest); 660 lp->last_timeout = jiffies; 661 } 662 663 if (lp->cur_tx == -1) 664 netif_wake_queue(dev); 665 } 666 667 /* The typical workload of the driver: Handle the network interface 668 * interrupts. Establish which device needs attention, and call the correct 669 * chipset interrupt handler. 670 */ 671 irqreturn_t arcnet_interrupt(int irq, void *dev_id) 672 { 673 struct net_device *dev = dev_id; 674 struct arcnet_local *lp; 675 int recbuf, status, diagstatus, didsomething, boguscount; 676 int retval = IRQ_NONE; 677 678 BUGMSG(D_DURING, "\n"); 679 680 BUGMSG(D_DURING, "in arcnet_interrupt\n"); 681 682 lp = netdev_priv(dev); 683 BUG_ON(!lp); 684 685 spin_lock(&lp->lock); 686 687 /* RESET flag was enabled - if device is not running, we must 688 * clear it right away (but nothing else). 689 */ 690 if (!netif_running(dev)) { 691 if (ASTATUS() & RESETflag) 692 ACOMMAND(CFLAGScmd | RESETclear); 693 AINTMASK(0); 694 spin_unlock(&lp->lock); 695 return retval; 696 } 697 698 BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n", 699 ASTATUS(), lp->intmask); 700 701 boguscount = 5; 702 do { 703 status = ASTATUS(); 704 diagstatus = (status >> 8) & 0xFF; 705 706 BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n", 707 __FILE__, __LINE__, __func__, status); 708 didsomething = 0; 709 710 /* RESET flag was enabled - card is resetting and if RX is 711 * disabled, it's NOT because we just got a packet. 712 * 713 * The card is in an undefined state. 714 * Clear it out and start over. 715 */ 716 if (status & RESETflag) { 717 BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status); 718 arcnet_close(dev); 719 arcnet_open(dev); 720 721 /* get out of the interrupt handler! */ 722 break; 723 } 724 /* RX is inhibited - we must have received something. 725 * Prepare to receive into the next buffer. 726 * 727 * We don't actually copy the received packet from the card 728 * until after the transmit handler runs (and possibly 729 * launches the next tx); this should improve latency slightly 730 * if we get both types of interrupts at once. 731 */ 732 recbuf = -1; 733 if (status & lp->intmask & NORXflag) { 734 recbuf = lp->cur_rx; 735 BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n", 736 recbuf, status); 737 738 lp->cur_rx = get_arcbuf(dev); 739 if (lp->cur_rx != -1) { 740 BUGMSG(D_DURING, "enabling receive to buffer #%d\n", 741 lp->cur_rx); 742 ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts); 743 } 744 didsomething++; 745 } 746 747 if ((diagstatus & EXCNAKflag)) { 748 BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n", 749 diagstatus); 750 751 ACOMMAND(NOTXcmd); /* disable transmit */ 752 lp->excnak_pending = 1; 753 754 ACOMMAND(EXCNAKclear); 755 lp->intmask &= ~(EXCNAKflag); 756 didsomething++; 757 } 758 759 /* a transmit finished, and we're interested in it. */ 760 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) { 761 lp->intmask &= ~(TXFREEflag | EXCNAKflag); 762 763 BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status); 764 765 if (lp->cur_tx != -1 && !lp->timed_out) { 766 if (!(status & TXACKflag)) { 767 if (lp->lasttrans_dest != 0) { 768 BUGMSG(D_EXTRA, 769 "transmit was not acknowledged! (status=%Xh, dest=%02Xh)\n", 770 status, lp->lasttrans_dest); 771 dev->stats.tx_errors++; 772 dev->stats.tx_carrier_errors++; 773 } else { 774 BUGMSG(D_DURING, 775 "broadcast was not acknowledged; that's normal (status=%Xh, dest=%02Xh)\n", 776 status, lp->lasttrans_dest); 777 } 778 } 779 780 if (lp->outgoing.proto && 781 lp->outgoing.proto->ack_tx) { 782 int ackstatus; 783 784 if (status & TXACKflag) 785 ackstatus = 2; 786 else if (lp->excnak_pending) 787 ackstatus = 1; 788 else 789 ackstatus = 0; 790 791 lp->outgoing.proto 792 ->ack_tx(dev, ackstatus); 793 } 794 } 795 if (lp->cur_tx != -1) 796 release_arcbuf(dev, lp->cur_tx); 797 798 lp->cur_tx = -1; 799 lp->timed_out = 0; 800 didsomething++; 801 802 /* send another packet if there is one */ 803 go_tx(dev); 804 805 /* continue a split packet, if any */ 806 if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) { 807 int txbuf = get_arcbuf(dev); 808 809 if (txbuf != -1) { 810 if (lp->outgoing.proto->continue_tx(dev, txbuf)) { 811 /* that was the last segment */ 812 dev->stats.tx_bytes += lp->outgoing.skb->len; 813 if (!lp->outgoing.proto->ack_tx) { 814 dev_kfree_skb_irq(lp->outgoing.skb); 815 lp->outgoing.proto = NULL; 816 } 817 } 818 lp->next_tx = txbuf; 819 } 820 } 821 /* inform upper layers of idleness, if necessary */ 822 if (lp->cur_tx == -1) 823 netif_wake_queue(dev); 824 } 825 /* now process the received packet, if any */ 826 if (recbuf != -1) { 827 if (BUGLVL(D_RX)) 828 arcnet_dump_packet(dev, recbuf, "rx irq", 0); 829 830 arcnet_rx(dev, recbuf); 831 release_arcbuf(dev, recbuf); 832 833 didsomething++; 834 } 835 if (status & lp->intmask & RECONflag) { 836 ACOMMAND(CFLAGScmd | CONFIGclear); 837 dev->stats.tx_carrier_errors++; 838 839 BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n", 840 status); 841 /* MYRECON bit is at bit 7 of diagstatus */ 842 if (diagstatus & 0x80) 843 BUGMSG(D_RECON, "Put out that recon myself\n"); 844 845 /* is the RECON info empty or old? */ 846 if (!lp->first_recon || !lp->last_recon || 847 time_after(jiffies, lp->last_recon + HZ * 10)) { 848 if (lp->network_down) 849 BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n"); 850 lp->first_recon = lp->last_recon = jiffies; 851 lp->num_recons = lp->network_down = 0; 852 853 BUGMSG(D_DURING, "recon: clearing counters.\n"); 854 } else { /* add to current RECON counter */ 855 lp->last_recon = jiffies; 856 lp->num_recons++; 857 858 BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n", 859 lp->num_recons, 860 (lp->last_recon - lp->first_recon) / HZ, 861 lp->network_down); 862 863 /* if network is marked up; 864 * and first_recon and last_recon are 60+ apart; 865 * and the average no. of recons counted is 866 * > RECON_THRESHOLD/min; 867 * then print a warning message. 868 */ 869 if (!lp->network_down && 870 (lp->last_recon - lp->first_recon) <= HZ * 60 && 871 lp->num_recons >= RECON_THRESHOLD) { 872 lp->network_down = 1; 873 BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n"); 874 } else if (!lp->network_down && 875 lp->last_recon - lp->first_recon > HZ * 60) { 876 /* reset counters if we've gone for over a minute. */ 877 lp->first_recon = lp->last_recon; 878 lp->num_recons = 1; 879 } 880 } 881 } else if (lp->network_down && 882 time_after(jiffies, lp->last_recon + HZ * 10)) { 883 if (lp->network_down) 884 BUGMSG(D_NORMAL, "cabling restored?\n"); 885 lp->first_recon = lp->last_recon = 0; 886 lp->num_recons = lp->network_down = 0; 887 888 BUGMSG(D_DURING, "not recon: clearing counters anyway.\n"); 889 } 890 891 if (didsomething) 892 retval |= IRQ_HANDLED; 893 } while (--boguscount && didsomething); 894 895 BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n", 896 ASTATUS(), boguscount); 897 BUGMSG(D_DURING, "\n"); 898 899 AINTMASK(0); 900 udelay(1); 901 AINTMASK(lp->intmask); 902 903 spin_unlock(&lp->lock); 904 return retval; 905 } 906 907 /* This is a generic packet receiver that calls arcnet??_rx depending on the 908 * protocol ID found. 909 */ 910 static void arcnet_rx(struct net_device *dev, int bufnum) 911 { 912 struct arcnet_local *lp = netdev_priv(dev); 913 struct archdr pkt; 914 struct arc_rfc1201 *soft; 915 int length, ofs; 916 917 soft = &pkt.soft.rfc1201; 918 919 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE); 920 if (pkt.hard.offset[0]) { 921 ofs = pkt.hard.offset[0]; 922 length = 256 - ofs; 923 } else { 924 ofs = pkt.hard.offset[1]; 925 length = 512 - ofs; 926 } 927 928 /* get the full header, if possible */ 929 if (sizeof(pkt.soft) <= length) { 930 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft)); 931 } else { 932 memset(&pkt.soft, 0, sizeof(pkt.soft)); 933 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length); 934 } 935 936 BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh (%d+4 bytes)\n", 937 bufnum, pkt.hard.source, pkt.hard.dest, length); 938 939 dev->stats.rx_packets++; 940 dev->stats.rx_bytes += length + ARC_HDR_SIZE; 941 942 /* call the right receiver for the protocol */ 943 if (arc_proto_map[soft->proto]->is_ip) { 944 if (BUGLVL(D_PROTO)) { 945 struct ArcProto 946 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]], 947 *newp = arc_proto_map[soft->proto]; 948 949 if (oldp != newp) { 950 BUGMSG(D_PROTO, 951 "got protocol %02Xh; encap for host %02Xh is now '%c' (was '%c')\n", 952 soft->proto, pkt.hard.source, 953 newp->suffix, oldp->suffix); 954 } 955 } 956 957 /* broadcasts will always be done with the last-used encap. */ 958 lp->default_proto[0] = soft->proto; 959 960 /* in striking contrast, the following isn't a hack. */ 961 lp->default_proto[pkt.hard.source] = soft->proto; 962 } 963 /* call the protocol-specific receiver. */ 964 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length); 965 } 966 967 static void null_rx(struct net_device *dev, int bufnum, 968 struct archdr *pkthdr, int length) 969 { 970 BUGMSG(D_PROTO, 971 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n", 972 pkthdr->soft.rfc1201.proto, pkthdr->hard.source); 973 } 974 975 static int null_build_header(struct sk_buff *skb, struct net_device *dev, 976 unsigned short type, uint8_t daddr) 977 { 978 struct arcnet_local *lp = netdev_priv(dev); 979 980 BUGMSG(D_PROTO, 981 "tx: can't build header for encap %02Xh; load a protocol driver.\n", 982 lp->default_proto[daddr]); 983 984 /* always fails */ 985 return 0; 986 } 987 988 /* the "do nothing" prepare_tx function warns that there's nothing to do. */ 989 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, 990 int length, int bufnum) 991 { 992 struct arcnet_local *lp = netdev_priv(dev); 993 struct arc_hardware newpkt; 994 995 BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n"); 996 997 /* send a packet to myself -- will never get received, of course */ 998 newpkt.source = newpkt.dest = dev->dev_addr[0]; 999 1000 /* only one byte of actual data (and it's random) */ 1001 newpkt.offset[0] = 0xFF; 1002 1003 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE); 1004 1005 return 1; /* done */ 1006 } 1007