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 <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 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 <kcornete@nyx10.cs.du.edu> 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 <vsher@sao.stavropol.su> 40 * - Textual information and more alternate source from Joachim Koenig 41 * <jojo@repas.de> 42 */ 43 44 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 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/jiffies.h> 54 55 #include "arcdevice.h" 56 #include "com9026.h" 57 58 /* "do nothing" functions for protocol drivers */ 59 static void null_rx(struct net_device *dev, int bufnum, 60 struct archdr *pkthdr, int length); 61 static int null_build_header(struct sk_buff *skb, struct net_device *dev, 62 unsigned short type, uint8_t daddr); 63 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, 64 int length, int bufnum); 65 66 static void arcnet_rx(struct net_device *dev, int bufnum); 67 68 /* one ArcProto per possible proto ID. None of the elements of 69 * arc_proto_map are allowed to be NULL; they will get set to 70 * arc_proto_default instead. It also must not be NULL; if you would like 71 * to set it to NULL, set it to &arc_proto_null instead. 72 */ 73 struct ArcProto *arc_proto_map[256]; 74 EXPORT_SYMBOL(arc_proto_map); 75 76 struct ArcProto *arc_proto_default; 77 EXPORT_SYMBOL(arc_proto_default); 78 79 struct ArcProto *arc_bcast_proto; 80 EXPORT_SYMBOL(arc_bcast_proto); 81 82 struct ArcProto *arc_raw_proto; 83 EXPORT_SYMBOL(arc_raw_proto); 84 85 static struct ArcProto arc_proto_null = { 86 .suffix = '?', 87 .mtu = XMTU, 88 .is_ip = 0, 89 .rx = null_rx, 90 .build_header = null_build_header, 91 .prepare_tx = null_prepare_tx, 92 .continue_tx = NULL, 93 .ack_tx = NULL 94 }; 95 96 /* Exported function prototypes */ 97 int arcnet_debug = ARCNET_DEBUG; 98 EXPORT_SYMBOL(arcnet_debug); 99 100 /* Internal function prototypes */ 101 static int arcnet_header(struct sk_buff *skb, struct net_device *dev, 102 unsigned short type, const void *daddr, 103 const void *saddr, unsigned len); 104 static int go_tx(struct net_device *dev); 105 106 static int debug = ARCNET_DEBUG; 107 module_param(debug, int, 0); 108 MODULE_LICENSE("GPL"); 109 110 static int __init arcnet_init(void) 111 { 112 int count; 113 114 arcnet_debug = debug; 115 116 pr_info("arcnet loaded\n"); 117 118 /* initialize the protocol map */ 119 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null; 120 for (count = 0; count < 256; count++) 121 arc_proto_map[count] = arc_proto_default; 122 123 if (BUGLVL(D_DURING)) 124 pr_info("struct sizes: %Zd %Zd %Zd %Zd %Zd\n", 125 sizeof(struct arc_hardware), 126 sizeof(struct arc_rfc1201), 127 sizeof(struct arc_rfc1051), 128 sizeof(struct arc_eth_encap), 129 sizeof(struct archdr)); 130 131 return 0; 132 } 133 134 static void __exit arcnet_exit(void) 135 { 136 } 137 138 module_init(arcnet_init); 139 module_exit(arcnet_exit); 140 141 /* Dump the contents of an sk_buff */ 142 #if ARCNET_DEBUG_MAX & D_SKB 143 void arcnet_dump_skb(struct net_device *dev, 144 struct sk_buff *skb, char *desc) 145 { 146 char hdr[32]; 147 148 /* dump the packet */ 149 snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc); 150 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET, 151 16, 1, skb->data, skb->len, true); 152 } 153 EXPORT_SYMBOL(arcnet_dump_skb); 154 #endif 155 156 /* Dump the contents of an ARCnet buffer */ 157 #if (ARCNET_DEBUG_MAX & (D_RX | D_TX)) 158 static void arcnet_dump_packet(struct net_device *dev, int bufnum, 159 char *desc, int take_arcnet_lock) 160 { 161 struct arcnet_local *lp = netdev_priv(dev); 162 int i, length; 163 unsigned long flags = 0; 164 static uint8_t buf[512]; 165 char hdr[32]; 166 167 /* hw.copy_from_card expects IRQ context so take the IRQ lock 168 * to keep it single threaded 169 */ 170 if (take_arcnet_lock) 171 spin_lock_irqsave(&lp->lock, flags); 172 173 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512); 174 if (take_arcnet_lock) 175 spin_unlock_irqrestore(&lp->lock, flags); 176 177 /* if the offset[0] byte is nonzero, this is a 256-byte packet */ 178 length = (buf[2] ? 256 : 512); 179 180 /* dump the packet */ 181 snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc); 182 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET, 183 16, 1, buf, length, true); 184 } 185 186 #else 187 188 #define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) do { } while (0) 189 190 #endif 191 192 /* Unregister a protocol driver from the arc_proto_map. Protocol drivers 193 * are responsible for registering themselves, but the unregister routine 194 * is pretty generic so we'll do it here. 195 */ 196 void arcnet_unregister_proto(struct ArcProto *proto) 197 { 198 int count; 199 200 if (arc_proto_default == proto) 201 arc_proto_default = &arc_proto_null; 202 if (arc_bcast_proto == proto) 203 arc_bcast_proto = arc_proto_default; 204 if (arc_raw_proto == proto) 205 arc_raw_proto = arc_proto_default; 206 207 for (count = 0; count < 256; count++) { 208 if (arc_proto_map[count] == proto) 209 arc_proto_map[count] = arc_proto_default; 210 } 211 } 212 EXPORT_SYMBOL(arcnet_unregister_proto); 213 214 /* Add a buffer to the queue. Only the interrupt handler is allowed to do 215 * this, unless interrupts are disabled. 216 * 217 * Note: we don't check for a full queue, since there aren't enough buffers 218 * to more than fill it. 219 */ 220 static void release_arcbuf(struct net_device *dev, int bufnum) 221 { 222 struct arcnet_local *lp = netdev_priv(dev); 223 int i; 224 225 lp->buf_queue[lp->first_free_buf++] = bufnum; 226 lp->first_free_buf %= 5; 227 228 if (BUGLVL(D_DURING)) { 229 arc_printk(D_DURING, dev, "release_arcbuf: freed #%d; buffer queue is now: ", 230 bufnum); 231 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5) 232 arc_cont(D_DURING, "#%d ", lp->buf_queue[i]); 233 arc_cont(D_DURING, "\n"); 234 } 235 } 236 237 /* Get a buffer from the queue. 238 * If this returns -1, there are no buffers available. 239 */ 240 static int get_arcbuf(struct net_device *dev) 241 { 242 struct arcnet_local *lp = netdev_priv(dev); 243 int buf = -1, i; 244 245 if (!atomic_dec_and_test(&lp->buf_lock)) { 246 /* already in this function */ 247 arc_printk(D_NORMAL, dev, "get_arcbuf: overlap (%d)!\n", 248 lp->buf_lock.counter); 249 } else { /* we can continue */ 250 if (lp->next_buf >= 5) 251 lp->next_buf -= 5; 252 253 if (lp->next_buf == lp->first_free_buf) { 254 arc_printk(D_NORMAL, dev, "get_arcbuf: BUG: no buffers are available??\n"); 255 } else { 256 buf = lp->buf_queue[lp->next_buf++]; 257 lp->next_buf %= 5; 258 } 259 } 260 261 if (BUGLVL(D_DURING)) { 262 arc_printk(D_DURING, dev, "get_arcbuf: got #%d; buffer queue is now: ", 263 buf); 264 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5) 265 arc_cont(D_DURING, "#%d ", lp->buf_queue[i]); 266 arc_cont(D_DURING, "\n"); 267 } 268 269 atomic_inc(&lp->buf_lock); 270 return buf; 271 } 272 273 static int choose_mtu(void) 274 { 275 int count, mtu = 65535; 276 277 /* choose the smallest MTU of all available encaps */ 278 for (count = 0; count < 256; count++) { 279 if (arc_proto_map[count] != &arc_proto_null && 280 arc_proto_map[count]->mtu < mtu) { 281 mtu = arc_proto_map[count]->mtu; 282 } 283 } 284 285 return mtu == 65535 ? XMTU : mtu; 286 } 287 288 static const struct header_ops arcnet_header_ops = { 289 .create = arcnet_header, 290 }; 291 292 static const struct net_device_ops arcnet_netdev_ops = { 293 .ndo_open = arcnet_open, 294 .ndo_stop = arcnet_close, 295 .ndo_start_xmit = arcnet_send_packet, 296 .ndo_tx_timeout = arcnet_timeout, 297 }; 298 299 /* Setup a struct device for ARCnet. */ 300 static void arcdev_setup(struct net_device *dev) 301 { 302 dev->type = ARPHRD_ARCNET; 303 dev->netdev_ops = &arcnet_netdev_ops; 304 dev->header_ops = &arcnet_header_ops; 305 dev->hard_header_len = sizeof(struct archdr); 306 dev->mtu = choose_mtu(); 307 308 dev->addr_len = ARCNET_ALEN; 309 dev->tx_queue_len = 100; 310 dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */ 311 dev->watchdog_timeo = TX_TIMEOUT; 312 313 /* New-style flags. */ 314 dev->flags = IFF_BROADCAST; 315 } 316 317 struct net_device *alloc_arcdev(const char *name) 318 { 319 struct net_device *dev; 320 321 dev = alloc_netdev(sizeof(struct arcnet_local), 322 name && *name ? name : "arc%d", NET_NAME_UNKNOWN, 323 arcdev_setup); 324 if (dev) { 325 struct arcnet_local *lp = netdev_priv(dev); 326 327 spin_lock_init(&lp->lock); 328 } 329 330 return dev; 331 } 332 EXPORT_SYMBOL(alloc_arcdev); 333 334 /* Open/initialize the board. This is called sometime after booting when 335 * the 'ifconfig' program is run. 336 * 337 * This routine should set everything up anew at each open, even registers 338 * that "should" only need to be set once at boot, so that there is 339 * non-reboot way to recover if something goes wrong. 340 */ 341 int arcnet_open(struct net_device *dev) 342 { 343 struct arcnet_local *lp = netdev_priv(dev); 344 int count, newmtu, error; 345 346 arc_printk(D_INIT, dev, "opened."); 347 348 if (!try_module_get(lp->hw.owner)) 349 return -ENODEV; 350 351 if (BUGLVL(D_PROTO)) { 352 arc_printk(D_PROTO, dev, "protocol map (default is '%c'): ", 353 arc_proto_default->suffix); 354 for (count = 0; count < 256; count++) 355 arc_cont(D_PROTO, "%c", arc_proto_map[count]->suffix); 356 arc_cont(D_PROTO, "\n"); 357 } 358 359 arc_printk(D_INIT, dev, "arcnet_open: resetting card.\n"); 360 361 /* try to put the card in a defined state - if it fails the first 362 * time, actually reset it. 363 */ 364 error = -ENODEV; 365 if (lp->hw.reset(dev, 0) && lp->hw.reset(dev, 1)) 366 goto out_module_put; 367 368 newmtu = choose_mtu(); 369 if (newmtu < dev->mtu) 370 dev->mtu = newmtu; 371 372 arc_printk(D_INIT, dev, "arcnet_open: mtu: %d.\n", dev->mtu); 373 374 /* autodetect the encapsulation for each host. */ 375 memset(lp->default_proto, 0, sizeof(lp->default_proto)); 376 377 /* the broadcast address is special - use the 'bcast' protocol */ 378 for (count = 0; count < 256; count++) { 379 if (arc_proto_map[count] == arc_bcast_proto) { 380 lp->default_proto[0] = count; 381 break; 382 } 383 } 384 385 /* initialize buffers */ 386 atomic_set(&lp->buf_lock, 1); 387 388 lp->next_buf = lp->first_free_buf = 0; 389 release_arcbuf(dev, 0); 390 release_arcbuf(dev, 1); 391 release_arcbuf(dev, 2); 392 release_arcbuf(dev, 3); 393 lp->cur_tx = lp->next_tx = -1; 394 lp->cur_rx = -1; 395 396 lp->rfc1201.sequence = 1; 397 398 /* bring up the hardware driver */ 399 if (lp->hw.open) 400 lp->hw.open(dev); 401 402 if (dev->dev_addr[0] == 0) 403 arc_printk(D_NORMAL, dev, "WARNING! Station address 00 is reserved for broadcasts!\n"); 404 else if (dev->dev_addr[0] == 255) 405 arc_printk(D_NORMAL, dev, "WARNING! Station address FF may confuse DOS networking programs!\n"); 406 407 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); 408 if (lp->hw.status(dev) & RESETflag) { 409 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", 410 __FILE__, __LINE__, __func__); 411 lp->hw.command(dev, CFLAGScmd | RESETclear); 412 } 413 414 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); 415 /* make sure we're ready to receive IRQ's. */ 416 lp->hw.intmask(dev, 0); 417 udelay(1); /* give it time to set the mask before 418 * we reset it again. (may not even be 419 * necessary) 420 */ 421 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); 422 lp->intmask = NORXflag | RECONflag; 423 lp->hw.intmask(dev, lp->intmask); 424 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); 425 426 netif_start_queue(dev); 427 428 return 0; 429 430 out_module_put: 431 module_put(lp->hw.owner); 432 return error; 433 } 434 EXPORT_SYMBOL(arcnet_open); 435 436 /* The inverse routine to arcnet_open - shuts down the card. */ 437 int arcnet_close(struct net_device *dev) 438 { 439 struct arcnet_local *lp = netdev_priv(dev); 440 441 netif_stop_queue(dev); 442 443 /* flush TX and disable RX */ 444 lp->hw.intmask(dev, 0); 445 lp->hw.command(dev, NOTXcmd); /* stop transmit */ 446 lp->hw.command(dev, NORXcmd); /* disable receive */ 447 mdelay(1); 448 449 /* shut down the card */ 450 lp->hw.close(dev); 451 module_put(lp->hw.owner); 452 return 0; 453 } 454 EXPORT_SYMBOL(arcnet_close); 455 456 static int arcnet_header(struct sk_buff *skb, struct net_device *dev, 457 unsigned short type, const void *daddr, 458 const void *saddr, unsigned len) 459 { 460 const struct arcnet_local *lp = netdev_priv(dev); 461 uint8_t _daddr, proto_num; 462 struct ArcProto *proto; 463 464 arc_printk(D_DURING, dev, 465 "create header from %d to %d; protocol %d (%Xh); size %u.\n", 466 saddr ? *(uint8_t *)saddr : -1, 467 daddr ? *(uint8_t *)daddr : -1, 468 type, type, len); 469 470 if (skb->len != 0 && len != skb->len) 471 arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n", 472 skb->len, len); 473 474 /* Type is host order - ? */ 475 if (type == ETH_P_ARCNET) { 476 proto = arc_raw_proto; 477 arc_printk(D_DEBUG, dev, "arc_raw_proto used. proto='%c'\n", 478 proto->suffix); 479 _daddr = daddr ? *(uint8_t *)daddr : 0; 480 } else if (!daddr) { 481 /* if the dest addr isn't provided, we can't choose an 482 * encapsulation! Store the packet type (eg. ETH_P_IP) 483 * for now, and we'll push on a real header when we do 484 * rebuild_header. 485 */ 486 *(uint16_t *)skb_push(skb, 2) = type; 487 /* XXX: Why not use skb->mac_len? */ 488 if (skb->network_header - skb->mac_header != 2) 489 arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! diff (%u) is not 2!\n", 490 skb->network_header - skb->mac_header); 491 return -2; /* return error -- can't transmit yet! */ 492 } else { 493 /* otherwise, we can just add the header as usual. */ 494 _daddr = *(uint8_t *)daddr; 495 proto_num = lp->default_proto[_daddr]; 496 proto = arc_proto_map[proto_num]; 497 arc_printk(D_DURING, dev, "building header for %02Xh using protocol '%c'\n", 498 proto_num, proto->suffix); 499 if (proto == &arc_proto_null && arc_bcast_proto != proto) { 500 arc_printk(D_DURING, dev, "actually, let's use '%c' instead.\n", 501 arc_bcast_proto->suffix); 502 proto = arc_bcast_proto; 503 } 504 } 505 return proto->build_header(skb, dev, type, _daddr); 506 } 507 508 /* Called by the kernel in order to transmit a packet. */ 509 netdev_tx_t arcnet_send_packet(struct sk_buff *skb, 510 struct net_device *dev) 511 { 512 struct arcnet_local *lp = netdev_priv(dev); 513 struct archdr *pkt; 514 struct arc_rfc1201 *soft; 515 struct ArcProto *proto; 516 int txbuf; 517 unsigned long flags; 518 int freeskb, retval; 519 520 arc_printk(D_DURING, dev, 521 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n", 522 lp->hw.status(dev), lp->cur_tx, lp->next_tx, skb->len, skb->protocol); 523 524 pkt = (struct archdr *)skb->data; 525 soft = &pkt->soft.rfc1201; 526 proto = arc_proto_map[soft->proto]; 527 528 arc_printk(D_SKB_SIZE, dev, "skb: transmitting %d bytes to %02X\n", 529 skb->len, pkt->hard.dest); 530 if (BUGLVL(D_SKB)) 531 arcnet_dump_skb(dev, skb, "tx"); 532 533 /* fits in one packet? */ 534 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) { 535 arc_printk(D_NORMAL, dev, "fixme: packet too large: compensating badly!\n"); 536 dev_kfree_skb(skb); 537 return NETDEV_TX_OK; /* don't try again */ 538 } 539 540 /* We're busy transmitting a packet... */ 541 netif_stop_queue(dev); 542 543 spin_lock_irqsave(&lp->lock, flags); 544 lp->hw.intmask(dev, 0); 545 if (lp->next_tx == -1) 546 txbuf = get_arcbuf(dev); 547 else 548 txbuf = -1; 549 550 if (txbuf != -1) { 551 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) && 552 !proto->ack_tx) { 553 /* done right away and we don't want to acknowledge 554 * the package later - forget about it now 555 */ 556 dev->stats.tx_bytes += skb->len; 557 freeskb = 1; 558 } else { 559 /* do it the 'split' way */ 560 lp->outgoing.proto = proto; 561 lp->outgoing.skb = skb; 562 lp->outgoing.pkt = pkt; 563 564 freeskb = 0; 565 566 if (proto->continue_tx && 567 proto->continue_tx(dev, txbuf)) { 568 arc_printk(D_NORMAL, dev, 569 "bug! continue_tx finished the first time! (proto='%c')\n", 570 proto->suffix); 571 } 572 } 573 retval = NETDEV_TX_OK; 574 lp->next_tx = txbuf; 575 } else { 576 retval = NETDEV_TX_BUSY; 577 freeskb = 0; 578 } 579 580 arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n", 581 __FILE__, __LINE__, __func__, lp->hw.status(dev)); 582 /* make sure we didn't ignore a TX IRQ while we were in here */ 583 lp->hw.intmask(dev, 0); 584 585 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); 586 lp->intmask |= TXFREEflag | EXCNAKflag; 587 lp->hw.intmask(dev, lp->intmask); 588 arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n", 589 __FILE__, __LINE__, __func__, lp->hw.status(dev)); 590 591 spin_unlock_irqrestore(&lp->lock, flags); 592 if (freeskb) 593 dev_kfree_skb(skb); 594 595 return retval; /* no need to try again */ 596 } 597 EXPORT_SYMBOL(arcnet_send_packet); 598 599 /* Actually start transmitting a packet that was loaded into a buffer 600 * by prepare_tx. This should _only_ be called by the interrupt handler. 601 */ 602 static int go_tx(struct net_device *dev) 603 { 604 struct arcnet_local *lp = netdev_priv(dev); 605 606 arc_printk(D_DURING, dev, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n", 607 lp->hw.status(dev), lp->intmask, lp->next_tx, lp->cur_tx); 608 609 if (lp->cur_tx != -1 || lp->next_tx == -1) 610 return 0; 611 612 if (BUGLVL(D_TX)) 613 arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0); 614 615 lp->cur_tx = lp->next_tx; 616 lp->next_tx = -1; 617 618 /* start sending */ 619 lp->hw.command(dev, TXcmd | (lp->cur_tx << 3)); 620 621 dev->stats.tx_packets++; 622 lp->lasttrans_dest = lp->lastload_dest; 623 lp->lastload_dest = 0; 624 lp->excnak_pending = 0; 625 lp->intmask |= TXFREEflag | EXCNAKflag; 626 627 return 1; 628 } 629 630 /* Called by the kernel when transmit times out */ 631 void arcnet_timeout(struct net_device *dev) 632 { 633 unsigned long flags; 634 struct arcnet_local *lp = netdev_priv(dev); 635 int status = lp->hw.status(dev); 636 char *msg; 637 638 spin_lock_irqsave(&lp->lock, flags); 639 if (status & TXFREEflag) { /* transmit _DID_ finish */ 640 msg = " - missed IRQ?"; 641 } else { 642 msg = ""; 643 dev->stats.tx_aborted_errors++; 644 lp->timed_out = 1; 645 lp->hw.command(dev, NOTXcmd | (lp->cur_tx << 3)); 646 } 647 dev->stats.tx_errors++; 648 649 /* make sure we didn't miss a TX or a EXC NAK IRQ */ 650 lp->hw.intmask(dev, 0); 651 lp->intmask |= TXFREEflag | EXCNAKflag; 652 lp->hw.intmask(dev, lp->intmask); 653 654 spin_unlock_irqrestore(&lp->lock, flags); 655 656 if (time_after(jiffies, lp->last_timeout + 10 * HZ)) { 657 arc_printk(D_EXTRA, dev, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n", 658 msg, status, lp->intmask, lp->lasttrans_dest); 659 lp->last_timeout = jiffies; 660 } 661 662 if (lp->cur_tx == -1) 663 netif_wake_queue(dev); 664 } 665 EXPORT_SYMBOL(arcnet_timeout); 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 arc_printk(D_DURING, dev, "\n"); 679 680 arc_printk(D_DURING, dev, "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 (lp->hw.status(dev) & RESETflag) 692 lp->hw.command(dev, CFLAGScmd | RESETclear); 693 lp->hw.intmask(dev, 0); 694 spin_unlock(&lp->lock); 695 return retval; 696 } 697 698 arc_printk(D_DURING, dev, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n", 699 lp->hw.status(dev), lp->intmask); 700 701 boguscount = 5; 702 do { 703 status = lp->hw.status(dev); 704 diagstatus = (status >> 8) & 0xFF; 705 706 arc_printk(D_DEBUG, dev, "%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 arc_printk(D_NORMAL, dev, "spurious reset (status=%Xh)\n", 718 status); 719 arcnet_close(dev); 720 arcnet_open(dev); 721 722 /* get out of the interrupt handler! */ 723 break; 724 } 725 /* RX is inhibited - we must have received something. 726 * Prepare to receive into the next buffer. 727 * 728 * We don't actually copy the received packet from the card 729 * until after the transmit handler runs (and possibly 730 * launches the next tx); this should improve latency slightly 731 * if we get both types of interrupts at once. 732 */ 733 recbuf = -1; 734 if (status & lp->intmask & NORXflag) { 735 recbuf = lp->cur_rx; 736 arc_printk(D_DURING, dev, "Buffer #%d: receive irq (status=%Xh)\n", 737 recbuf, status); 738 739 lp->cur_rx = get_arcbuf(dev); 740 if (lp->cur_rx != -1) { 741 arc_printk(D_DURING, dev, "enabling receive to buffer #%d\n", 742 lp->cur_rx); 743 lp->hw.command(dev, RXcmd | (lp->cur_rx << 3) | RXbcasts); 744 } 745 didsomething++; 746 } 747 748 if ((diagstatus & EXCNAKflag)) { 749 arc_printk(D_DURING, dev, "EXCNAK IRQ (diagstat=%Xh)\n", 750 diagstatus); 751 752 lp->hw.command(dev, NOTXcmd); /* disable transmit */ 753 lp->excnak_pending = 1; 754 755 lp->hw.command(dev, EXCNAKclear); 756 lp->intmask &= ~(EXCNAKflag); 757 didsomething++; 758 } 759 760 /* a transmit finished, and we're interested in it. */ 761 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) { 762 lp->intmask &= ~(TXFREEflag | EXCNAKflag); 763 764 arc_printk(D_DURING, dev, "TX IRQ (stat=%Xh)\n", 765 status); 766 767 if (lp->cur_tx != -1 && !lp->timed_out) { 768 if (!(status & TXACKflag)) { 769 if (lp->lasttrans_dest != 0) { 770 arc_printk(D_EXTRA, dev, 771 "transmit was not acknowledged! (status=%Xh, dest=%02Xh)\n", 772 status, 773 lp->lasttrans_dest); 774 dev->stats.tx_errors++; 775 dev->stats.tx_carrier_errors++; 776 } else { 777 arc_printk(D_DURING, dev, 778 "broadcast was not acknowledged; that's normal (status=%Xh, dest=%02Xh)\n", 779 status, 780 lp->lasttrans_dest); 781 } 782 } 783 784 if (lp->outgoing.proto && 785 lp->outgoing.proto->ack_tx) { 786 int ackstatus; 787 788 if (status & TXACKflag) 789 ackstatus = 2; 790 else if (lp->excnak_pending) 791 ackstatus = 1; 792 else 793 ackstatus = 0; 794 795 lp->outgoing.proto 796 ->ack_tx(dev, ackstatus); 797 } 798 } 799 if (lp->cur_tx != -1) 800 release_arcbuf(dev, lp->cur_tx); 801 802 lp->cur_tx = -1; 803 lp->timed_out = 0; 804 didsomething++; 805 806 /* send another packet if there is one */ 807 go_tx(dev); 808 809 /* continue a split packet, if any */ 810 if (lp->outgoing.proto && 811 lp->outgoing.proto->continue_tx) { 812 int txbuf = get_arcbuf(dev); 813 814 if (txbuf != -1) { 815 if (lp->outgoing.proto->continue_tx(dev, txbuf)) { 816 /* that was the last segment */ 817 dev->stats.tx_bytes += lp->outgoing.skb->len; 818 if (!lp->outgoing.proto->ack_tx) { 819 dev_kfree_skb_irq(lp->outgoing.skb); 820 lp->outgoing.proto = NULL; 821 } 822 } 823 lp->next_tx = txbuf; 824 } 825 } 826 /* inform upper layers of idleness, if necessary */ 827 if (lp->cur_tx == -1) 828 netif_wake_queue(dev); 829 } 830 /* now process the received packet, if any */ 831 if (recbuf != -1) { 832 if (BUGLVL(D_RX)) 833 arcnet_dump_packet(dev, recbuf, "rx irq", 0); 834 835 arcnet_rx(dev, recbuf); 836 release_arcbuf(dev, recbuf); 837 838 didsomething++; 839 } 840 if (status & lp->intmask & RECONflag) { 841 lp->hw.command(dev, CFLAGScmd | CONFIGclear); 842 dev->stats.tx_carrier_errors++; 843 844 arc_printk(D_RECON, dev, "Network reconfiguration detected (status=%Xh)\n", 845 status); 846 /* MYRECON bit is at bit 7 of diagstatus */ 847 if (diagstatus & 0x80) 848 arc_printk(D_RECON, dev, "Put out that recon myself\n"); 849 850 /* is the RECON info empty or old? */ 851 if (!lp->first_recon || !lp->last_recon || 852 time_after(jiffies, lp->last_recon + HZ * 10)) { 853 if (lp->network_down) 854 arc_printk(D_NORMAL, dev, "reconfiguration detected: cabling restored?\n"); 855 lp->first_recon = lp->last_recon = jiffies; 856 lp->num_recons = lp->network_down = 0; 857 858 arc_printk(D_DURING, dev, "recon: clearing counters.\n"); 859 } else { /* add to current RECON counter */ 860 lp->last_recon = jiffies; 861 lp->num_recons++; 862 863 arc_printk(D_DURING, dev, "recon: counter=%d, time=%lds, net=%d\n", 864 lp->num_recons, 865 (lp->last_recon - lp->first_recon) / HZ, 866 lp->network_down); 867 868 /* if network is marked up; 869 * and first_recon and last_recon are 60+ apart; 870 * and the average no. of recons counted is 871 * > RECON_THRESHOLD/min; 872 * then print a warning message. 873 */ 874 if (!lp->network_down && 875 (lp->last_recon - lp->first_recon) <= HZ * 60 && 876 lp->num_recons >= RECON_THRESHOLD) { 877 lp->network_down = 1; 878 arc_printk(D_NORMAL, dev, "many reconfigurations detected: cabling problem?\n"); 879 } else if (!lp->network_down && 880 lp->last_recon - lp->first_recon > HZ * 60) { 881 /* reset counters if we've gone for 882 * over a minute. 883 */ 884 lp->first_recon = lp->last_recon; 885 lp->num_recons = 1; 886 } 887 } 888 } else if (lp->network_down && 889 time_after(jiffies, lp->last_recon + HZ * 10)) { 890 if (lp->network_down) 891 arc_printk(D_NORMAL, dev, "cabling restored?\n"); 892 lp->first_recon = lp->last_recon = 0; 893 lp->num_recons = lp->network_down = 0; 894 895 arc_printk(D_DURING, dev, "not recon: clearing counters anyway.\n"); 896 } 897 898 if (didsomething) 899 retval |= IRQ_HANDLED; 900 } while (--boguscount && didsomething); 901 902 arc_printk(D_DURING, dev, "arcnet_interrupt complete (status=%Xh, count=%d)\n", 903 lp->hw.status(dev), boguscount); 904 arc_printk(D_DURING, dev, "\n"); 905 906 lp->hw.intmask(dev, 0); 907 udelay(1); 908 lp->hw.intmask(dev, lp->intmask); 909 910 spin_unlock(&lp->lock); 911 return retval; 912 } 913 EXPORT_SYMBOL(arcnet_interrupt); 914 915 /* This is a generic packet receiver that calls arcnet??_rx depending on the 916 * protocol ID found. 917 */ 918 static void arcnet_rx(struct net_device *dev, int bufnum) 919 { 920 struct arcnet_local *lp = netdev_priv(dev); 921 struct archdr pkt; 922 struct arc_rfc1201 *soft; 923 int length, ofs; 924 925 soft = &pkt.soft.rfc1201; 926 927 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE); 928 if (pkt.hard.offset[0]) { 929 ofs = pkt.hard.offset[0]; 930 length = 256 - ofs; 931 } else { 932 ofs = pkt.hard.offset[1]; 933 length = 512 - ofs; 934 } 935 936 /* get the full header, if possible */ 937 if (sizeof(pkt.soft) <= length) { 938 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft)); 939 } else { 940 memset(&pkt.soft, 0, sizeof(pkt.soft)); 941 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length); 942 } 943 944 arc_printk(D_DURING, dev, "Buffer #%d: received packet from %02Xh to %02Xh (%d+4 bytes)\n", 945 bufnum, pkt.hard.source, pkt.hard.dest, length); 946 947 dev->stats.rx_packets++; 948 dev->stats.rx_bytes += length + ARC_HDR_SIZE; 949 950 /* call the right receiver for the protocol */ 951 if (arc_proto_map[soft->proto]->is_ip) { 952 if (BUGLVL(D_PROTO)) { 953 struct ArcProto 954 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]], 955 *newp = arc_proto_map[soft->proto]; 956 957 if (oldp != newp) { 958 arc_printk(D_PROTO, dev, 959 "got protocol %02Xh; encap for host %02Xh is now '%c' (was '%c')\n", 960 soft->proto, pkt.hard.source, 961 newp->suffix, oldp->suffix); 962 } 963 } 964 965 /* broadcasts will always be done with the last-used encap. */ 966 lp->default_proto[0] = soft->proto; 967 968 /* in striking contrast, the following isn't a hack. */ 969 lp->default_proto[pkt.hard.source] = soft->proto; 970 } 971 /* call the protocol-specific receiver. */ 972 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length); 973 } 974 975 static void null_rx(struct net_device *dev, int bufnum, 976 struct archdr *pkthdr, int length) 977 { 978 arc_printk(D_PROTO, dev, 979 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n", 980 pkthdr->soft.rfc1201.proto, pkthdr->hard.source); 981 } 982 983 static int null_build_header(struct sk_buff *skb, struct net_device *dev, 984 unsigned short type, uint8_t daddr) 985 { 986 struct arcnet_local *lp = netdev_priv(dev); 987 988 arc_printk(D_PROTO, dev, 989 "tx: can't build header for encap %02Xh; load a protocol driver.\n", 990 lp->default_proto[daddr]); 991 992 /* always fails */ 993 return 0; 994 } 995 996 /* the "do nothing" prepare_tx function warns that there's nothing to do. */ 997 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, 998 int length, int bufnum) 999 { 1000 struct arcnet_local *lp = netdev_priv(dev); 1001 struct arc_hardware newpkt; 1002 1003 arc_printk(D_PROTO, dev, "tx: no encap for this host; load a protocol driver.\n"); 1004 1005 /* send a packet to myself -- will never get received, of course */ 1006 newpkt.source = newpkt.dest = dev->dev_addr[0]; 1007 1008 /* only one byte of actual data (and it's random) */ 1009 newpkt.offset[0] = 0xFF; 1010 1011 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE); 1012 1013 return 1; /* done */ 1014 } 1015