Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 VERSION "arcnet: v3.93 BETA 2000/04/29 - by Avery Pennarun et al.\n" |
| 45 | |
| 46 | #include <linux/module.h> |
| 47 | #include <linux/config.h> |
| 48 | #include <linux/types.h> |
| 49 | #include <linux/delay.h> |
| 50 | #include <linux/netdevice.h> |
| 51 | #include <linux/if_arp.h> |
| 52 | #include <net/arp.h> |
| 53 | #include <linux/init.h> |
| 54 | #include <linux/arcdevice.h> |
Marcelo Feitoza Parisi | ff5688a | 2006-01-09 18:37:15 -0800 | [diff] [blame] | 55 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | /* "do nothing" functions for protocol drivers */ |
| 58 | static void null_rx(struct net_device *dev, int bufnum, |
| 59 | struct archdr *pkthdr, int length); |
| 60 | static int null_build_header(struct sk_buff *skb, struct net_device *dev, |
| 61 | unsigned short type, uint8_t daddr); |
| 62 | static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, |
| 63 | int length, int bufnum); |
| 64 | |
Adrian Bunk | f03aa2d | 2006-01-14 03:10:22 +0100 | [diff] [blame] | 65 | static void arcnet_rx(struct net_device *dev, int bufnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
| 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], *arc_proto_default, |
| 74 | *arc_bcast_proto, *arc_raw_proto; |
| 75 | |
Adrian Bunk | f03aa2d | 2006-01-14 03:10:22 +0100 | [diff] [blame] | 76 | static struct ArcProto arc_proto_null = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | { |
| 78 | .suffix = '?', |
| 79 | .mtu = XMTU, |
| 80 | .is_ip = 0, |
| 81 | .rx = null_rx, |
| 82 | .build_header = null_build_header, |
| 83 | .prepare_tx = null_prepare_tx, |
| 84 | .continue_tx = NULL, |
| 85 | .ack_tx = NULL |
| 86 | }; |
| 87 | |
| 88 | /* Exported function prototypes */ |
| 89 | int arcnet_debug = ARCNET_DEBUG; |
| 90 | |
| 91 | EXPORT_SYMBOL(arc_proto_map); |
| 92 | EXPORT_SYMBOL(arc_proto_default); |
| 93 | EXPORT_SYMBOL(arc_bcast_proto); |
| 94 | EXPORT_SYMBOL(arc_raw_proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | EXPORT_SYMBOL(arcnet_unregister_proto); |
| 96 | EXPORT_SYMBOL(arcnet_debug); |
| 97 | EXPORT_SYMBOL(alloc_arcdev); |
| 98 | EXPORT_SYMBOL(arcnet_interrupt); |
| 99 | |
| 100 | /* Internal function prototypes */ |
| 101 | static int arcnet_open(struct net_device *dev); |
| 102 | static int arcnet_close(struct net_device *dev); |
| 103 | static int arcnet_send_packet(struct sk_buff *skb, struct net_device *dev); |
| 104 | static void arcnet_timeout(struct net_device *dev); |
| 105 | static int arcnet_header(struct sk_buff *skb, struct net_device *dev, |
| 106 | unsigned short type, void *daddr, void *saddr, |
| 107 | unsigned len); |
| 108 | static int arcnet_rebuild_header(struct sk_buff *skb); |
| 109 | static struct net_device_stats *arcnet_get_stats(struct net_device *dev); |
| 110 | static int go_tx(struct net_device *dev); |
| 111 | |
| 112 | static int debug = ARCNET_DEBUG; |
| 113 | module_param(debug, int, 0); |
| 114 | MODULE_LICENSE("GPL"); |
| 115 | |
| 116 | static int __init arcnet_init(void) |
| 117 | { |
| 118 | int count; |
| 119 | |
| 120 | arcnet_debug = debug; |
| 121 | |
Adrian Bunk | f03aa2d | 2006-01-14 03:10:22 +0100 | [diff] [blame] | 122 | printk("arcnet loaded.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | #ifdef ALPHA_WARNING |
| 125 | BUGLVL(D_EXTRA) { |
| 126 | printk("arcnet: ***\n" |
| 127 | "arcnet: * Read arcnet.txt for important release notes!\n" |
| 128 | "arcnet: *\n" |
| 129 | "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n" |
| 130 | "arcnet: * me if you have any questions, comments, or bug reports.\n" |
| 131 | "arcnet: ***\n"); |
| 132 | } |
| 133 | #endif |
| 134 | |
| 135 | /* initialize the protocol map */ |
| 136 | arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null; |
| 137 | for (count = 0; count < 256; count++) |
| 138 | arc_proto_map[count] = arc_proto_default; |
| 139 | |
| 140 | BUGLVL(D_DURING) |
| 141 | printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n", |
| 142 | sizeof(struct arc_hardware), sizeof(struct arc_rfc1201), |
| 143 | sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap), |
| 144 | sizeof(struct archdr)); |
| 145 | |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | static void __exit arcnet_exit(void) |
| 150 | { |
| 151 | } |
| 152 | |
| 153 | module_init(arcnet_init); |
| 154 | module_exit(arcnet_exit); |
| 155 | |
| 156 | /* |
| 157 | * Dump the contents of an sk_buff |
| 158 | */ |
| 159 | #if ARCNET_DEBUG_MAX & D_SKB |
| 160 | void arcnet_dump_skb(struct net_device *dev, |
| 161 | struct sk_buff *skb, char *desc) |
| 162 | { |
| 163 | int i; |
| 164 | |
| 165 | printk(KERN_DEBUG "%6s: skb dump (%s) follows:", dev->name, desc); |
| 166 | for (i = 0; i < skb->len; i++) { |
| 167 | if (i % 16 == 0) |
| 168 | printk("\n" KERN_DEBUG "[%04X] ", i); |
| 169 | printk("%02X ", ((u_char *) skb->data)[i]); |
| 170 | } |
| 171 | printk("\n"); |
| 172 | } |
| 173 | |
| 174 | EXPORT_SYMBOL(arcnet_dump_skb); |
| 175 | #endif |
| 176 | |
| 177 | |
| 178 | /* |
| 179 | * Dump the contents of an ARCnet buffer |
| 180 | */ |
| 181 | #if (ARCNET_DEBUG_MAX & (D_RX | D_TX)) |
Adrian Bunk | f03aa2d | 2006-01-14 03:10:22 +0100 | [diff] [blame] | 182 | static void arcnet_dump_packet(struct net_device *dev, int bufnum, |
| 183 | char *desc, int take_arcnet_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | { |
| 185 | struct arcnet_local *lp = dev->priv; |
| 186 | int i, length; |
| 187 | unsigned long flags = 0; |
| 188 | static uint8_t buf[512]; |
| 189 | |
| 190 | /* hw.copy_from_card expects IRQ context so take the IRQ lock |
| 191 | to keep it single threaded */ |
| 192 | if(take_arcnet_lock) |
| 193 | spin_lock_irqsave(&lp->lock, flags); |
| 194 | |
| 195 | lp->hw.copy_from_card(dev, bufnum, 0, buf, 512); |
| 196 | if(take_arcnet_lock) |
| 197 | spin_unlock_irqrestore(&lp->lock, flags); |
| 198 | |
| 199 | /* if the offset[0] byte is nonzero, this is a 256-byte packet */ |
| 200 | length = (buf[2] ? 256 : 512); |
| 201 | |
| 202 | printk(KERN_DEBUG "%6s: packet dump (%s) follows:", dev->name, desc); |
| 203 | for (i = 0; i < length; i++) { |
| 204 | if (i % 16 == 0) |
| 205 | printk("\n" KERN_DEBUG "[%04X] ", i); |
| 206 | printk("%02X ", buf[i]); |
| 207 | } |
| 208 | printk("\n"); |
| 209 | |
| 210 | } |
| 211 | |
Adrian Bunk | f03aa2d | 2006-01-14 03:10:22 +0100 | [diff] [blame] | 212 | #else |
| 213 | |
| 214 | #define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) do { } while (0) |
| 215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | #endif |
| 217 | |
| 218 | |
| 219 | /* |
| 220 | * Unregister a protocol driver from the arc_proto_map. Protocol drivers |
| 221 | * are responsible for registering themselves, but the unregister routine |
| 222 | * is pretty generic so we'll do it here. |
| 223 | */ |
| 224 | void arcnet_unregister_proto(struct ArcProto *proto) |
| 225 | { |
| 226 | int count; |
| 227 | |
| 228 | if (arc_proto_default == proto) |
| 229 | arc_proto_default = &arc_proto_null; |
| 230 | if (arc_bcast_proto == proto) |
| 231 | arc_bcast_proto = arc_proto_default; |
| 232 | if (arc_raw_proto == proto) |
| 233 | arc_raw_proto = arc_proto_default; |
| 234 | |
| 235 | for (count = 0; count < 256; count++) { |
| 236 | if (arc_proto_map[count] == proto) |
| 237 | arc_proto_map[count] = arc_proto_default; |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | |
| 242 | /* |
| 243 | * Add a buffer to the queue. Only the interrupt handler is allowed to do |
| 244 | * this, unless interrupts are disabled. |
| 245 | * |
| 246 | * Note: we don't check for a full queue, since there aren't enough buffers |
| 247 | * to more than fill it. |
| 248 | */ |
| 249 | static void release_arcbuf(struct net_device *dev, int bufnum) |
| 250 | { |
| 251 | struct arcnet_local *lp = dev->priv; |
| 252 | int i; |
| 253 | |
| 254 | lp->buf_queue[lp->first_free_buf++] = bufnum; |
| 255 | lp->first_free_buf %= 5; |
| 256 | |
| 257 | BUGLVL(D_DURING) { |
| 258 | BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ", |
| 259 | bufnum); |
| 260 | for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5) |
| 261 | BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]); |
| 262 | BUGMSG2(D_DURING, "\n"); |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | |
| 267 | /* |
| 268 | * Get a buffer from the queue. If this returns -1, there are no buffers |
| 269 | * available. |
| 270 | */ |
| 271 | static int get_arcbuf(struct net_device *dev) |
| 272 | { |
| 273 | struct arcnet_local *lp = dev->priv; |
| 274 | int buf = -1, i; |
| 275 | |
| 276 | if (!atomic_dec_and_test(&lp->buf_lock)) { |
| 277 | /* already in this function */ |
| 278 | BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n", |
| 279 | lp->buf_lock.counter); |
| 280 | } |
| 281 | else { /* we can continue */ |
| 282 | if (lp->next_buf >= 5) |
| 283 | lp->next_buf -= 5; |
| 284 | |
| 285 | if (lp->next_buf == lp->first_free_buf) |
| 286 | BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n"); |
| 287 | else { |
| 288 | buf = lp->buf_queue[lp->next_buf++]; |
| 289 | lp->next_buf %= 5; |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | |
| 294 | BUGLVL(D_DURING) { |
| 295 | BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf); |
| 296 | for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5) |
| 297 | BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]); |
| 298 | BUGMSG2(D_DURING, "\n"); |
| 299 | } |
| 300 | |
| 301 | atomic_inc(&lp->buf_lock); |
| 302 | return buf; |
| 303 | } |
| 304 | |
| 305 | |
| 306 | static int choose_mtu(void) |
| 307 | { |
| 308 | int count, mtu = 65535; |
| 309 | |
| 310 | /* choose the smallest MTU of all available encaps */ |
| 311 | for (count = 0; count < 256; count++) { |
| 312 | if (arc_proto_map[count] != &arc_proto_null |
| 313 | && arc_proto_map[count]->mtu < mtu) { |
| 314 | mtu = arc_proto_map[count]->mtu; |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | return mtu == 65535 ? XMTU : mtu; |
| 319 | } |
| 320 | |
| 321 | |
| 322 | /* Setup a struct device for ARCnet. */ |
| 323 | static void arcdev_setup(struct net_device *dev) |
| 324 | { |
| 325 | dev->type = ARPHRD_ARCNET; |
| 326 | dev->hard_header_len = sizeof(struct archdr); |
| 327 | dev->mtu = choose_mtu(); |
| 328 | |
| 329 | dev->addr_len = ARCNET_ALEN; |
| 330 | dev->tx_queue_len = 100; |
| 331 | dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */ |
| 332 | dev->watchdog_timeo = TX_TIMEOUT; |
| 333 | |
| 334 | /* New-style flags. */ |
| 335 | dev->flags = IFF_BROADCAST; |
| 336 | |
| 337 | /* |
| 338 | * Put in this stuff here, so we don't have to export the symbols to |
| 339 | * the chipset drivers. |
| 340 | */ |
| 341 | dev->open = arcnet_open; |
| 342 | dev->stop = arcnet_close; |
| 343 | dev->hard_start_xmit = arcnet_send_packet; |
| 344 | dev->tx_timeout = arcnet_timeout; |
| 345 | dev->get_stats = arcnet_get_stats; |
| 346 | dev->hard_header = arcnet_header; |
| 347 | dev->rebuild_header = arcnet_rebuild_header; |
| 348 | } |
| 349 | |
| 350 | struct net_device *alloc_arcdev(char *name) |
| 351 | { |
| 352 | struct net_device *dev; |
| 353 | |
| 354 | dev = alloc_netdev(sizeof(struct arcnet_local), |
| 355 | name && *name ? name : "arc%d", arcdev_setup); |
| 356 | if(dev) { |
| 357 | struct arcnet_local *lp = (struct arcnet_local *) dev->priv; |
| 358 | spin_lock_init(&lp->lock); |
| 359 | } |
| 360 | |
| 361 | return dev; |
| 362 | } |
| 363 | |
| 364 | /* |
| 365 | * Open/initialize the board. This is called sometime after booting when |
| 366 | * the 'ifconfig' program is run. |
| 367 | * |
| 368 | * This routine should set everything up anew at each open, even registers |
| 369 | * that "should" only need to be set once at boot, so that there is |
| 370 | * non-reboot way to recover if something goes wrong. |
| 371 | */ |
| 372 | static int arcnet_open(struct net_device *dev) |
| 373 | { |
| 374 | struct arcnet_local *lp = dev->priv; |
| 375 | int count, newmtu, error; |
| 376 | |
| 377 | BUGMSG(D_INIT,"opened."); |
| 378 | |
| 379 | if (!try_module_get(lp->hw.owner)) |
| 380 | return -ENODEV; |
| 381 | |
| 382 | BUGLVL(D_PROTO) { |
| 383 | int count; |
| 384 | BUGMSG(D_PROTO, "protocol map (default is '%c'): ", |
| 385 | arc_proto_default->suffix); |
| 386 | for (count = 0; count < 256; count++) |
| 387 | BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix); |
| 388 | BUGMSG2(D_PROTO, "\n"); |
| 389 | } |
| 390 | |
| 391 | |
| 392 | BUGMSG(D_INIT, "arcnet_open: resetting card.\n"); |
| 393 | |
| 394 | /* try to put the card in a defined state - if it fails the first |
| 395 | * time, actually reset it. |
| 396 | */ |
| 397 | error = -ENODEV; |
| 398 | if (ARCRESET(0) && ARCRESET(1)) |
| 399 | goto out_module_put; |
| 400 | |
| 401 | newmtu = choose_mtu(); |
| 402 | if (newmtu < dev->mtu) |
| 403 | dev->mtu = newmtu; |
| 404 | |
| 405 | BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu); |
| 406 | |
| 407 | /* autodetect the encapsulation for each host. */ |
| 408 | memset(lp->default_proto, 0, sizeof(lp->default_proto)); |
| 409 | |
| 410 | /* the broadcast address is special - use the 'bcast' protocol */ |
| 411 | for (count = 0; count < 256; count++) { |
| 412 | if (arc_proto_map[count] == arc_bcast_proto) { |
| 413 | lp->default_proto[0] = count; |
| 414 | break; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | /* initialize buffers */ |
| 419 | atomic_set(&lp->buf_lock, 1); |
| 420 | |
| 421 | lp->next_buf = lp->first_free_buf = 0; |
| 422 | release_arcbuf(dev, 0); |
| 423 | release_arcbuf(dev, 1); |
| 424 | release_arcbuf(dev, 2); |
| 425 | release_arcbuf(dev, 3); |
| 426 | lp->cur_tx = lp->next_tx = -1; |
| 427 | lp->cur_rx = -1; |
| 428 | |
| 429 | lp->rfc1201.sequence = 1; |
| 430 | |
| 431 | /* bring up the hardware driver */ |
| 432 | if (lp->hw.open) |
| 433 | lp->hw.open(dev); |
| 434 | |
| 435 | if (dev->dev_addr[0] == 0) |
| 436 | BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved " |
| 437 | "for broadcasts!\n"); |
| 438 | else if (dev->dev_addr[0] == 255) |
| 439 | BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse " |
| 440 | "DOS networking programs!\n"); |
| 441 | |
| 442 | BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__); |
| 443 | if (ASTATUS() & RESETflag) { |
| 444 | BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__); |
| 445 | ACOMMAND(CFLAGScmd | RESETclear); |
| 446 | } |
| 447 | |
| 448 | |
| 449 | BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__); |
| 450 | /* make sure we're ready to receive IRQ's. */ |
| 451 | AINTMASK(0); |
| 452 | udelay(1); /* give it time to set the mask before |
| 453 | * we reset it again. (may not even be |
| 454 | * necessary) |
| 455 | */ |
| 456 | BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__); |
| 457 | lp->intmask = NORXflag | RECONflag; |
| 458 | AINTMASK(lp->intmask); |
| 459 | BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__); |
| 460 | |
| 461 | netif_start_queue(dev); |
| 462 | |
| 463 | return 0; |
| 464 | |
| 465 | out_module_put: |
| 466 | module_put(lp->hw.owner); |
| 467 | return error; |
| 468 | } |
| 469 | |
| 470 | |
| 471 | /* The inverse routine to arcnet_open - shuts down the card. */ |
| 472 | static int arcnet_close(struct net_device *dev) |
| 473 | { |
| 474 | struct arcnet_local *lp = dev->priv; |
| 475 | |
| 476 | netif_stop_queue(dev); |
| 477 | |
| 478 | /* flush TX and disable RX */ |
| 479 | AINTMASK(0); |
| 480 | ACOMMAND(NOTXcmd); /* stop transmit */ |
| 481 | ACOMMAND(NORXcmd); /* disable receive */ |
| 482 | mdelay(1); |
| 483 | |
| 484 | /* shut down the card */ |
| 485 | lp->hw.close(dev); |
| 486 | module_put(lp->hw.owner); |
| 487 | return 0; |
| 488 | } |
| 489 | |
| 490 | |
| 491 | static int arcnet_header(struct sk_buff *skb, struct net_device *dev, |
| 492 | unsigned short type, void *daddr, void *saddr, |
| 493 | unsigned len) |
| 494 | { |
| 495 | struct arcnet_local *lp = dev->priv; |
| 496 | uint8_t _daddr, proto_num; |
| 497 | struct ArcProto *proto; |
| 498 | |
| 499 | BUGMSG(D_DURING, |
| 500 | "create header from %d to %d; protocol %d (%Xh); size %u.\n", |
| 501 | saddr ? *(uint8_t *) saddr : -1, |
| 502 | daddr ? *(uint8_t *) daddr : -1, |
| 503 | type, type, len); |
| 504 | |
| 505 | if (skb->len!=0 && len != skb->len) |
| 506 | BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n", |
| 507 | skb->len, len); |
| 508 | |
| 509 | |
| 510 | /* Type is host order - ? */ |
| 511 | if(type == ETH_P_ARCNET) { |
| 512 | proto = arc_raw_proto; |
| 513 | BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n",proto->suffix); |
| 514 | _daddr = daddr ? *(uint8_t *) daddr : 0; |
| 515 | } |
| 516 | else if (!daddr) { |
| 517 | /* |
| 518 | * if the dest addr isn't provided, we can't choose an encapsulation! |
| 519 | * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a |
| 520 | * real header when we do rebuild_header. |
| 521 | */ |
| 522 | *(uint16_t *) skb_push(skb, 2) = type; |
| 523 | if (skb->nh.raw - skb->mac.raw != 2) |
| 524 | BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n", |
| 525 | (int)(skb->nh.raw - skb->mac.raw)); |
| 526 | return -2; /* return error -- can't transmit yet! */ |
| 527 | } |
| 528 | else { |
| 529 | /* otherwise, we can just add the header as usual. */ |
| 530 | _daddr = *(uint8_t *) daddr; |
| 531 | proto_num = lp->default_proto[_daddr]; |
| 532 | proto = arc_proto_map[proto_num]; |
| 533 | BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'\n", |
| 534 | proto_num, proto->suffix); |
| 535 | if (proto == &arc_proto_null && arc_bcast_proto != proto) { |
| 536 | BUGMSG(D_DURING, "actually, let's use '%c' instead.\n", |
| 537 | arc_bcast_proto->suffix); |
| 538 | proto = arc_bcast_proto; |
| 539 | } |
| 540 | } |
| 541 | return proto->build_header(skb, dev, type, _daddr); |
| 542 | } |
| 543 | |
| 544 | |
| 545 | /* |
| 546 | * Rebuild the ARCnet hard header. This is called after an ARP (or in the |
| 547 | * future other address resolution) has completed on this sk_buff. We now |
| 548 | * let ARP fill in the destination field. |
| 549 | */ |
| 550 | static int arcnet_rebuild_header(struct sk_buff *skb) |
| 551 | { |
| 552 | struct net_device *dev = skb->dev; |
| 553 | struct arcnet_local *lp = dev->priv; |
| 554 | int status = 0; /* default is failure */ |
| 555 | unsigned short type; |
| 556 | uint8_t daddr=0; |
| 557 | struct ArcProto *proto; |
| 558 | |
| 559 | if (skb->nh.raw - skb->mac.raw != 2) { |
| 560 | BUGMSG(D_NORMAL, |
| 561 | "rebuild_header: shouldn't be here! (hdrsize=%d)\n", |
| 562 | (int)(skb->nh.raw - skb->mac.raw)); |
| 563 | return 0; |
| 564 | } |
| 565 | type = *(uint16_t *) skb_pull(skb, 2); |
| 566 | BUGMSG(D_DURING, "rebuild header for protocol %Xh\n", type); |
| 567 | |
| 568 | if (type == ETH_P_IP) { |
| 569 | #ifdef CONFIG_INET |
| 570 | BUGMSG(D_DURING, "rebuild header for ethernet protocol %Xh\n", type); |
| 571 | status = arp_find(&daddr, skb) ? 1 : 0; |
| 572 | BUGMSG(D_DURING, " rebuilt: dest is %d; protocol %Xh\n", |
| 573 | daddr, type); |
| 574 | #endif |
| 575 | } else { |
| 576 | BUGMSG(D_NORMAL, |
| 577 | "I don't understand ethernet protocol %Xh addresses!\n", type); |
| 578 | lp->stats.tx_errors++; |
| 579 | lp->stats.tx_aborted_errors++; |
| 580 | } |
| 581 | |
| 582 | /* if we couldn't resolve the address... give up. */ |
| 583 | if (!status) |
| 584 | return 0; |
| 585 | |
| 586 | /* add the _real_ header this time! */ |
| 587 | proto = arc_proto_map[lp->default_proto[daddr]]; |
| 588 | proto->build_header(skb, dev, type, daddr); |
| 589 | |
| 590 | return 1; /* success */ |
| 591 | } |
| 592 | |
| 593 | |
| 594 | |
| 595 | /* Called by the kernel in order to transmit a packet. */ |
| 596 | static int arcnet_send_packet(struct sk_buff *skb, struct net_device *dev) |
| 597 | { |
| 598 | struct arcnet_local *lp = dev->priv; |
| 599 | struct archdr *pkt; |
| 600 | struct arc_rfc1201 *soft; |
| 601 | struct ArcProto *proto; |
| 602 | int txbuf; |
| 603 | unsigned long flags; |
Pieter Dejaeghere | c6bb15a | 2005-09-06 19:54:48 -0700 | [diff] [blame] | 604 | int freeskb, retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | |
| 606 | BUGMSG(D_DURING, |
| 607 | "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n", |
| 608 | ASTATUS(), lp->cur_tx, lp->next_tx, skb->len,skb->protocol); |
| 609 | |
| 610 | pkt = (struct archdr *) skb->data; |
| 611 | soft = &pkt->soft.rfc1201; |
| 612 | proto = arc_proto_map[soft->proto]; |
| 613 | |
| 614 | BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n", |
| 615 | skb->len, pkt->hard.dest); |
| 616 | BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "tx"); |
| 617 | |
| 618 | /* fits in one packet? */ |
| 619 | if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) { |
| 620 | BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n"); |
| 621 | dev_kfree_skb(skb); |
Pieter Dejaeghere | c6bb15a | 2005-09-06 19:54:48 -0700 | [diff] [blame] | 622 | return NETDEV_TX_OK; /* don't try again */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | } |
| 624 | |
| 625 | /* We're busy transmitting a packet... */ |
| 626 | netif_stop_queue(dev); |
| 627 | |
| 628 | spin_lock_irqsave(&lp->lock, flags); |
| 629 | AINTMASK(0); |
Pieter Dejaeghere | c6bb15a | 2005-09-06 19:54:48 -0700 | [diff] [blame] | 630 | if(lp->next_tx == -1) |
| 631 | txbuf = get_arcbuf(dev); |
| 632 | else { |
| 633 | txbuf = -1; |
| 634 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | if (txbuf != -1) { |
| 636 | if (proto->prepare_tx(dev, pkt, skb->len, txbuf) && |
| 637 | !proto->ack_tx) { |
| 638 | /* done right away and we don't want to acknowledge |
| 639 | the package later - forget about it now */ |
| 640 | lp->stats.tx_bytes += skb->len; |
| 641 | freeskb = 1; |
| 642 | } else { |
| 643 | /* do it the 'split' way */ |
| 644 | lp->outgoing.proto = proto; |
| 645 | lp->outgoing.skb = skb; |
| 646 | lp->outgoing.pkt = pkt; |
| 647 | |
Pieter Dejaeghere | c6bb15a | 2005-09-06 19:54:48 -0700 | [diff] [blame] | 648 | freeskb = 0; |
| 649 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | if (proto->continue_tx && |
| 651 | proto->continue_tx(dev, txbuf)) { |
| 652 | BUGMSG(D_NORMAL, |
| 653 | "bug! continue_tx finished the first time! " |
| 654 | "(proto='%c')\n", proto->suffix); |
| 655 | } |
| 656 | } |
Pieter Dejaeghere | c6bb15a | 2005-09-06 19:54:48 -0700 | [diff] [blame] | 657 | retval = NETDEV_TX_OK; |
| 658 | dev->trans_start = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | lp->next_tx = txbuf; |
| 660 | } else { |
Pieter Dejaeghere | c6bb15a | 2005-09-06 19:54:48 -0700 | [diff] [blame] | 661 | retval = NETDEV_TX_BUSY; |
| 662 | freeskb = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | } |
| 664 | |
| 665 | BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__FUNCTION__,ASTATUS()); |
| 666 | /* make sure we didn't ignore a TX IRQ while we were in here */ |
| 667 | AINTMASK(0); |
| 668 | |
| 669 | BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__); |
| 670 | lp->intmask |= TXFREEflag|EXCNAKflag; |
| 671 | AINTMASK(lp->intmask); |
| 672 | BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__FUNCTION__,ASTATUS()); |
| 673 | |
| 674 | spin_unlock_irqrestore(&lp->lock, flags); |
| 675 | if (freeskb) { |
| 676 | dev_kfree_skb(skb); |
| 677 | } |
Pieter Dejaeghere | c6bb15a | 2005-09-06 19:54:48 -0700 | [diff] [blame] | 678 | return retval; /* no need to try again */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | } |
| 680 | |
| 681 | |
| 682 | /* |
| 683 | * Actually start transmitting a packet that was loaded into a buffer |
| 684 | * by prepare_tx. This should _only_ be called by the interrupt handler. |
| 685 | */ |
| 686 | static int go_tx(struct net_device *dev) |
| 687 | { |
| 688 | struct arcnet_local *lp = dev->priv; |
| 689 | |
| 690 | BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n", |
| 691 | ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx); |
| 692 | |
| 693 | if (lp->cur_tx != -1 || lp->next_tx == -1) |
| 694 | return 0; |
| 695 | |
| 696 | BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0); |
| 697 | |
| 698 | lp->cur_tx = lp->next_tx; |
| 699 | lp->next_tx = -1; |
| 700 | |
| 701 | /* start sending */ |
| 702 | ACOMMAND(TXcmd | (lp->cur_tx << 3)); |
| 703 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | lp->stats.tx_packets++; |
| 705 | lp->lasttrans_dest = lp->lastload_dest; |
| 706 | lp->lastload_dest = 0; |
| 707 | lp->excnak_pending = 0; |
| 708 | lp->intmask |= TXFREEflag|EXCNAKflag; |
| 709 | |
| 710 | return 1; |
| 711 | } |
| 712 | |
| 713 | |
| 714 | /* Called by the kernel when transmit times out */ |
| 715 | static void arcnet_timeout(struct net_device *dev) |
| 716 | { |
| 717 | unsigned long flags; |
| 718 | struct arcnet_local *lp = dev->priv; |
| 719 | int status = ASTATUS(); |
| 720 | char *msg; |
| 721 | |
| 722 | spin_lock_irqsave(&lp->lock, flags); |
| 723 | if (status & TXFREEflag) { /* transmit _DID_ finish */ |
| 724 | msg = " - missed IRQ?"; |
| 725 | } else { |
| 726 | msg = ""; |
| 727 | lp->stats.tx_aborted_errors++; |
| 728 | lp->timed_out = 1; |
| 729 | ACOMMAND(NOTXcmd | (lp->cur_tx << 3)); |
| 730 | } |
| 731 | lp->stats.tx_errors++; |
| 732 | |
| 733 | /* make sure we didn't miss a TX or a EXC NAK IRQ */ |
| 734 | AINTMASK(0); |
| 735 | lp->intmask |= TXFREEflag|EXCNAKflag; |
| 736 | AINTMASK(lp->intmask); |
| 737 | |
| 738 | spin_unlock_irqrestore(&lp->lock, flags); |
| 739 | |
Marcelo Feitoza Parisi | ff5688a | 2006-01-09 18:37:15 -0800 | [diff] [blame] | 740 | if (time_after(jiffies, lp->last_timeout + 10*HZ)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n", |
| 742 | msg, status, lp->intmask, lp->lasttrans_dest); |
| 743 | lp->last_timeout = jiffies; |
| 744 | } |
| 745 | |
| 746 | if (lp->cur_tx == -1) |
| 747 | netif_wake_queue(dev); |
| 748 | } |
| 749 | |
| 750 | |
| 751 | /* |
| 752 | * The typical workload of the driver: Handle the network interface |
| 753 | * interrupts. Establish which device needs attention, and call the correct |
| 754 | * chipset interrupt handler. |
| 755 | */ |
| 756 | irqreturn_t arcnet_interrupt(int irq, void *dev_id, struct pt_regs *regs) |
| 757 | { |
| 758 | struct net_device *dev = dev_id; |
| 759 | struct arcnet_local *lp; |
| 760 | int recbuf, status, diagstatus, didsomething, boguscount; |
| 761 | int retval = IRQ_NONE; |
| 762 | |
| 763 | BUGMSG(D_DURING, "\n"); |
| 764 | |
| 765 | BUGMSG(D_DURING, "in arcnet_interrupt\n"); |
| 766 | |
| 767 | lp = dev->priv; |
| 768 | if (!lp) |
| 769 | BUG(); |
| 770 | |
| 771 | spin_lock(&lp->lock); |
| 772 | |
| 773 | /* |
| 774 | * RESET flag was enabled - if device is not running, we must clear it right |
| 775 | * away (but nothing else). |
| 776 | */ |
| 777 | if (!netif_running(dev)) { |
| 778 | if (ASTATUS() & RESETflag) |
| 779 | ACOMMAND(CFLAGScmd | RESETclear); |
| 780 | AINTMASK(0); |
| 781 | spin_unlock(&lp->lock); |
| 782 | return IRQ_HANDLED; |
| 783 | } |
| 784 | |
| 785 | BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n", |
| 786 | ASTATUS(), lp->intmask); |
| 787 | |
| 788 | boguscount = 5; |
| 789 | do { |
| 790 | status = ASTATUS(); |
| 791 | diagstatus = (status >> 8) & 0xFF; |
| 792 | |
| 793 | BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n", |
| 794 | __FILE__,__LINE__,__FUNCTION__,status); |
| 795 | didsomething = 0; |
| 796 | |
| 797 | /* |
| 798 | * RESET flag was enabled - card is resetting and if RX is |
| 799 | * disabled, it's NOT because we just got a packet. |
| 800 | * |
| 801 | * The card is in an undefined state. Clear it out and start over. |
| 802 | */ |
| 803 | if (status & RESETflag) { |
| 804 | BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status); |
| 805 | arcnet_close(dev); |
| 806 | arcnet_open(dev); |
| 807 | |
| 808 | /* get out of the interrupt handler! */ |
| 809 | break; |
| 810 | } |
| 811 | /* |
| 812 | * RX is inhibited - we must have received something. Prepare to |
| 813 | * receive into the next buffer. |
| 814 | * |
| 815 | * We don't actually copy the received packet from the card until |
| 816 | * after the transmit handler runs (and possibly launches the next |
| 817 | * tx); this should improve latency slightly if we get both types |
| 818 | * of interrupts at once. |
| 819 | */ |
| 820 | recbuf = -1; |
| 821 | if (status & lp->intmask & NORXflag) { |
| 822 | recbuf = lp->cur_rx; |
| 823 | BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n", |
| 824 | recbuf, status); |
| 825 | |
| 826 | lp->cur_rx = get_arcbuf(dev); |
| 827 | if (lp->cur_rx != -1) { |
| 828 | BUGMSG(D_DURING, "enabling receive to buffer #%d\n", |
| 829 | lp->cur_rx); |
| 830 | ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts); |
| 831 | } |
| 832 | didsomething++; |
| 833 | } |
| 834 | |
| 835 | if((diagstatus & EXCNAKflag)) { |
| 836 | BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n", |
| 837 | diagstatus); |
| 838 | |
| 839 | ACOMMAND(NOTXcmd); /* disable transmit */ |
| 840 | lp->excnak_pending = 1; |
| 841 | |
| 842 | ACOMMAND(EXCNAKclear); |
| 843 | lp->intmask &= ~(EXCNAKflag); |
| 844 | didsomething++; |
| 845 | } |
| 846 | |
| 847 | |
| 848 | /* a transmit finished, and we're interested in it. */ |
| 849 | if ((status & lp->intmask & TXFREEflag) || lp->timed_out) { |
| 850 | lp->intmask &= ~(TXFREEflag|EXCNAKflag); |
| 851 | |
| 852 | BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status); |
| 853 | |
| 854 | if (lp->cur_tx != -1 && !lp->timed_out) { |
| 855 | if(!(status & TXACKflag)) { |
| 856 | if (lp->lasttrans_dest != 0) { |
| 857 | BUGMSG(D_EXTRA, |
| 858 | "transmit was not acknowledged! " |
| 859 | "(status=%Xh, dest=%02Xh)\n", |
| 860 | status, lp->lasttrans_dest); |
| 861 | lp->stats.tx_errors++; |
| 862 | lp->stats.tx_carrier_errors++; |
| 863 | } else { |
| 864 | BUGMSG(D_DURING, |
| 865 | "broadcast was not acknowledged; that's normal " |
| 866 | "(status=%Xh, dest=%02Xh)\n", |
| 867 | status, lp->lasttrans_dest); |
| 868 | } |
| 869 | } |
| 870 | |
| 871 | if (lp->outgoing.proto && |
| 872 | lp->outgoing.proto->ack_tx) { |
| 873 | int ackstatus; |
| 874 | if(status & TXACKflag) |
| 875 | ackstatus=2; |
| 876 | else if(lp->excnak_pending) |
| 877 | ackstatus=1; |
| 878 | else |
| 879 | ackstatus=0; |
| 880 | |
| 881 | lp->outgoing.proto |
| 882 | ->ack_tx(dev, ackstatus); |
| 883 | } |
| 884 | } |
| 885 | if (lp->cur_tx != -1) |
| 886 | release_arcbuf(dev, lp->cur_tx); |
| 887 | |
| 888 | lp->cur_tx = -1; |
| 889 | lp->timed_out = 0; |
| 890 | didsomething++; |
| 891 | |
| 892 | /* send another packet if there is one */ |
| 893 | go_tx(dev); |
| 894 | |
| 895 | /* continue a split packet, if any */ |
| 896 | if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) { |
| 897 | int txbuf = get_arcbuf(dev); |
| 898 | if (txbuf != -1) { |
| 899 | if (lp->outgoing.proto->continue_tx(dev, txbuf)) { |
| 900 | /* that was the last segment */ |
| 901 | lp->stats.tx_bytes += lp->outgoing.skb->len; |
| 902 | if(!lp->outgoing.proto->ack_tx) |
| 903 | { |
| 904 | dev_kfree_skb_irq(lp->outgoing.skb); |
| 905 | lp->outgoing.proto = NULL; |
| 906 | } |
| 907 | } |
| 908 | lp->next_tx = txbuf; |
| 909 | } |
| 910 | } |
| 911 | /* inform upper layers of idleness, if necessary */ |
| 912 | if (lp->cur_tx == -1) |
| 913 | netif_wake_queue(dev); |
| 914 | } |
| 915 | /* now process the received packet, if any */ |
| 916 | if (recbuf != -1) { |
| 917 | BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq", 0); |
| 918 | |
| 919 | arcnet_rx(dev, recbuf); |
| 920 | release_arcbuf(dev, recbuf); |
| 921 | |
| 922 | didsomething++; |
| 923 | } |
| 924 | if (status & lp->intmask & RECONflag) { |
| 925 | ACOMMAND(CFLAGScmd | CONFIGclear); |
| 926 | lp->stats.tx_carrier_errors++; |
| 927 | |
| 928 | BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n", |
| 929 | status); |
Pieter Dejaeghere | c6bb15a | 2005-09-06 19:54:48 -0700 | [diff] [blame] | 930 | /* MYRECON bit is at bit 7 of diagstatus */ |
| 931 | if(diagstatus & 0x80) |
| 932 | BUGMSG(D_RECON,"Put out that recon myself\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | |
| 934 | /* is the RECON info empty or old? */ |
| 935 | if (!lp->first_recon || !lp->last_recon || |
| 936 | jiffies - lp->last_recon > HZ * 10) { |
| 937 | if (lp->network_down) |
| 938 | BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n"); |
| 939 | lp->first_recon = lp->last_recon = jiffies; |
| 940 | lp->num_recons = lp->network_down = 0; |
| 941 | |
| 942 | BUGMSG(D_DURING, "recon: clearing counters.\n"); |
| 943 | } else { /* add to current RECON counter */ |
| 944 | lp->last_recon = jiffies; |
| 945 | lp->num_recons++; |
| 946 | |
| 947 | BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n", |
| 948 | lp->num_recons, |
| 949 | (lp->last_recon - lp->first_recon) / HZ, |
| 950 | lp->network_down); |
| 951 | |
| 952 | /* if network is marked up; |
| 953 | * and first_recon and last_recon are 60+ apart; |
| 954 | * and the average no. of recons counted is |
| 955 | * > RECON_THRESHOLD/min; |
| 956 | * then print a warning message. |
| 957 | */ |
| 958 | if (!lp->network_down |
| 959 | && (lp->last_recon - lp->first_recon) <= HZ * 60 |
| 960 | && lp->num_recons >= RECON_THRESHOLD) { |
| 961 | lp->network_down = 1; |
| 962 | BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n"); |
| 963 | } else if (!lp->network_down |
| 964 | && lp->last_recon - lp->first_recon > HZ * 60) { |
| 965 | /* reset counters if we've gone for over a minute. */ |
| 966 | lp->first_recon = lp->last_recon; |
| 967 | lp->num_recons = 1; |
| 968 | } |
| 969 | } |
| 970 | } else if (lp->network_down && jiffies - lp->last_recon > HZ * 10) { |
| 971 | if (lp->network_down) |
| 972 | BUGMSG(D_NORMAL, "cabling restored?\n"); |
| 973 | lp->first_recon = lp->last_recon = 0; |
| 974 | lp->num_recons = lp->network_down = 0; |
| 975 | |
| 976 | BUGMSG(D_DURING, "not recon: clearing counters anyway.\n"); |
| 977 | } |
| 978 | |
| 979 | if(didsomething) { |
| 980 | retval |= IRQ_HANDLED; |
| 981 | } |
| 982 | } |
| 983 | while (--boguscount && didsomething); |
| 984 | |
| 985 | BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n", |
| 986 | ASTATUS(), boguscount); |
| 987 | BUGMSG(D_DURING, "\n"); |
| 988 | |
| 989 | |
| 990 | AINTMASK(0); |
| 991 | udelay(1); |
| 992 | AINTMASK(lp->intmask); |
| 993 | |
| 994 | spin_unlock(&lp->lock); |
| 995 | return retval; |
| 996 | } |
| 997 | |
| 998 | |
| 999 | /* |
| 1000 | * This is a generic packet receiver that calls arcnet??_rx depending on the |
| 1001 | * protocol ID found. |
| 1002 | */ |
Adrian Bunk | f03aa2d | 2006-01-14 03:10:22 +0100 | [diff] [blame] | 1003 | static void arcnet_rx(struct net_device *dev, int bufnum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | { |
| 1005 | struct arcnet_local *lp = dev->priv; |
| 1006 | struct archdr pkt; |
| 1007 | struct arc_rfc1201 *soft; |
| 1008 | int length, ofs; |
| 1009 | |
| 1010 | soft = &pkt.soft.rfc1201; |
| 1011 | |
| 1012 | lp->hw.copy_from_card(dev, bufnum, 0, &pkt, sizeof(ARC_HDR_SIZE)); |
| 1013 | if (pkt.hard.offset[0]) { |
| 1014 | ofs = pkt.hard.offset[0]; |
| 1015 | length = 256 - ofs; |
| 1016 | } else { |
| 1017 | ofs = pkt.hard.offset[1]; |
| 1018 | length = 512 - ofs; |
| 1019 | } |
| 1020 | |
| 1021 | /* get the full header, if possible */ |
| 1022 | if (sizeof(pkt.soft) <= length) |
| 1023 | lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft)); |
| 1024 | else { |
| 1025 | memset(&pkt.soft, 0, sizeof(pkt.soft)); |
| 1026 | lp->hw.copy_from_card(dev, bufnum, ofs, soft, length); |
| 1027 | } |
| 1028 | |
| 1029 | BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh " |
| 1030 | "(%d+4 bytes)\n", |
| 1031 | bufnum, pkt.hard.source, pkt.hard.dest, length); |
| 1032 | |
| 1033 | lp->stats.rx_packets++; |
| 1034 | lp->stats.rx_bytes += length + ARC_HDR_SIZE; |
| 1035 | |
| 1036 | /* call the right receiver for the protocol */ |
| 1037 | if (arc_proto_map[soft->proto]->is_ip) { |
| 1038 | BUGLVL(D_PROTO) { |
| 1039 | struct ArcProto |
| 1040 | *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]], |
| 1041 | *newp = arc_proto_map[soft->proto]; |
| 1042 | |
| 1043 | if (oldp != newp) { |
| 1044 | BUGMSG(D_PROTO, |
| 1045 | "got protocol %02Xh; encap for host %02Xh is now '%c'" |
| 1046 | " (was '%c')\n", soft->proto, pkt.hard.source, |
| 1047 | newp->suffix, oldp->suffix); |
| 1048 | } |
| 1049 | } |
| 1050 | |
| 1051 | /* broadcasts will always be done with the last-used encap. */ |
| 1052 | lp->default_proto[0] = soft->proto; |
| 1053 | |
| 1054 | /* in striking contrast, the following isn't a hack. */ |
| 1055 | lp->default_proto[pkt.hard.source] = soft->proto; |
| 1056 | } |
| 1057 | /* call the protocol-specific receiver. */ |
| 1058 | arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length); |
| 1059 | } |
| 1060 | |
| 1061 | |
| 1062 | |
| 1063 | /* |
| 1064 | * Get the current statistics. This may be called with the card open or |
| 1065 | * closed. |
| 1066 | */ |
| 1067 | static struct net_device_stats *arcnet_get_stats(struct net_device *dev) |
| 1068 | { |
| 1069 | struct arcnet_local *lp = dev->priv; |
| 1070 | return &lp->stats; |
| 1071 | } |
| 1072 | |
| 1073 | |
| 1074 | static void null_rx(struct net_device *dev, int bufnum, |
| 1075 | struct archdr *pkthdr, int length) |
| 1076 | { |
| 1077 | BUGMSG(D_PROTO, |
| 1078 | "rx: don't know how to deal with proto %02Xh from host %02Xh.\n", |
| 1079 | pkthdr->soft.rfc1201.proto, pkthdr->hard.source); |
| 1080 | } |
| 1081 | |
| 1082 | |
| 1083 | static int null_build_header(struct sk_buff *skb, struct net_device *dev, |
| 1084 | unsigned short type, uint8_t daddr) |
| 1085 | { |
| 1086 | struct arcnet_local *lp = dev->priv; |
| 1087 | |
| 1088 | BUGMSG(D_PROTO, |
| 1089 | "tx: can't build header for encap %02Xh; load a protocol driver.\n", |
| 1090 | lp->default_proto[daddr]); |
| 1091 | |
| 1092 | /* always fails */ |
| 1093 | return 0; |
| 1094 | } |
| 1095 | |
| 1096 | |
| 1097 | /* the "do nothing" prepare_tx function warns that there's nothing to do. */ |
| 1098 | static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, |
| 1099 | int length, int bufnum) |
| 1100 | { |
| 1101 | struct arcnet_local *lp = dev->priv; |
| 1102 | struct arc_hardware newpkt; |
| 1103 | |
| 1104 | BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n"); |
| 1105 | |
| 1106 | /* send a packet to myself -- will never get received, of course */ |
| 1107 | newpkt.source = newpkt.dest = dev->dev_addr[0]; |
| 1108 | |
| 1109 | /* only one byte of actual data (and it's random) */ |
| 1110 | newpkt.offset[0] = 0xFF; |
| 1111 | |
| 1112 | lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE); |
| 1113 | |
| 1114 | return 1; /* done */ |
| 1115 | } |