drivers/s390/net/lcs.c

   1 /*
   2  *  linux/drivers/s390/net/lcs.c
   3  *
   4  *  Linux for S/390 Lan Channel Station Network Driver
   5  *
   6  *  Copyright (C)  1999-2001 IBM Deutschland Entwicklung GmbH,
   7  *                           IBM Corporation
   8  *    Author(s): Original Code written by
   9  *                        DJ Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
  10  *               Rewritten by
  11  *                        Frank Pavlic (fpavlic@de.ibm.com) and
  12  *                        Martin Schwidefsky <schwidefsky@de.ibm.com>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2, or (at your option)
  17  * any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/if.h>
  31 #include <linux/netdevice.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/trdevice.h>
  34 #include <linux/fddidevice.h>
  35 #include <linux/inetdevice.h>
  36 #include <linux/in.h>
  37 #include <linux/igmp.h>
  38 #include <linux/delay.h>
  39 #include <net/arp.h>
  40 #include <net/ip.h>
  41
  42 #include <asm/debug.h>
  43 #include <asm/idals.h>
  44 #include <asm/timex.h>
  45 #include <linux/device.h>
  46 #include <asm/ccwgroup.h>
  47
  48 #include "lcs.h"
  49 #include "cu3088.h"
  50
  51
  52 #if !defined(CONFIG_NET_ETHERNET) && \
  53     !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
  54 #error Cannot compile lcs.c without some net devices switched on.
  55 #endif
  56
  57 /**
  58  * initialization string for output
  59  */
  60
  61 static char version[] __initdata = "LCS driver";
  62 static char debug_buffer[255];
  63
  64 /**
  65  * Some prototypes.
  66  */
  67 static void lcs_tasklet(unsigned long);
  68 static void lcs_start_kernel_thread(struct lcs_card *card);
  69 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
  70 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
  71 static int lcs_recovery(void *ptr);
  72
  73 /**
  74  * Debug Facility Stuff
  75  */
  76 static debug_info_t *lcs_dbf_setup;
  77 static debug_info_t *lcs_dbf_trace;
  78
  79 /**
  80  *  LCS Debug Facility functions
  81  */
  82 static void
  83 lcs_unregister_debug_facility(void)
  84 {
  85         if (lcs_dbf_setup)
  86                 debug_unregister(lcs_dbf_setup);
  87         if (lcs_dbf_trace)
  88                 debug_unregister(lcs_dbf_trace);
  89 }
  90
  91 static int
  92 lcs_register_debug_facility(void)
  93 {
  94         lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
  95         lcs_dbf_trace = debug_register("lcs_trace", 2, 2, 8);
  96         if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
  97                 PRINT_ERR("Not enough memory for debug facility.\n");
  98                 lcs_unregister_debug_facility();
  99                 return -ENOMEM;
 100         }
 101         debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
 102         debug_set_level(lcs_dbf_setup, 2);
 103         debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
 104         debug_set_level(lcs_dbf_trace, 2);
 105         return 0;
 106 }
 107
 108 /**
 109  * Allocate io buffers.
 110  */
 111 static int
 112 lcs_alloc_channel(struct lcs_channel *channel)
 113 {
 114         int cnt;
 115
 116         LCS_DBF_TEXT(2, setup, "ichalloc");
 117         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 118                 /* alloc memory fo iobuffer */
 119                 channel->iob[cnt].data =
 120                         kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
 121                 if (channel->iob[cnt].data == NULL)
 122                         break;
 123                 channel->iob[cnt].state = BUF_STATE_EMPTY;
 124         }
 125         if (cnt < LCS_NUM_BUFFS) {
 126                 /* Not all io buffers could be allocated. */
 127                 LCS_DBF_TEXT(2, setup, "echalloc");
 128                 while (cnt-- > 0)
 129                         kfree(channel->iob[cnt].data);
 130                 return -ENOMEM;
 131         }
 132         return 0;
 133 }
 134
 135 /**
 136  * Free io buffers.
 137  */
 138 static void
 139 lcs_free_channel(struct lcs_channel *channel)
 140 {
 141         int cnt;
 142
 143         LCS_DBF_TEXT(2, setup, "ichfree");
 144         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 145                 kfree(channel->iob[cnt].data);
 146                 channel->iob[cnt].data = NULL;
 147         }
 148 }
 149
 150 /*
 151  * Cleanup channel.
 152  */
 153 static void
 154 lcs_cleanup_channel(struct lcs_channel *channel)
 155 {
 156         LCS_DBF_TEXT(3, setup, "cleanch");
 157         /* Kill write channel tasklets. */
 158         tasklet_kill(&channel->irq_tasklet);
 159         /* Free channel buffers. */
 160         lcs_free_channel(channel);
 161 }
 162
 163 /**
 164  * LCS free memory for card and channels.
 165  */
 166 static void
 167 lcs_free_card(struct lcs_card *card)
 168 {
 169         LCS_DBF_TEXT(2, setup, "remcard");
 170         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 171         kfree(card);
 172 }
 173
 174 /**
 175  * LCS alloc memory for card and channels
 176  */
 177 static struct lcs_card *
 178 lcs_alloc_card(void)
 179 {
 180         struct lcs_card *card;
 181         int rc;
 182
 183         LCS_DBF_TEXT(2, setup, "alloclcs");
 184
 185         card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
 186         if (card == NULL)
 187                 return NULL;
 188         card->lan_type = LCS_FRAME_TYPE_AUTO;
 189         card->pkt_seq = 0;
 190         card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
 191         /* Allocate io buffers for the read channel. */
 192         rc = lcs_alloc_channel(&card->read);
 193         if (rc){
 194                 LCS_DBF_TEXT(2, setup, "iccwerr");
 195                 lcs_free_card(card);
 196                 return NULL;
 197         }
 198         /* Allocate io buffers for the write channel. */
 199         rc = lcs_alloc_channel(&card->write);
 200         if (rc) {
 201                 LCS_DBF_TEXT(2, setup, "iccwerr");
 202                 lcs_cleanup_channel(&card->read);
 203                 lcs_free_card(card);
 204                 return NULL;
 205         }
 206
 207 #ifdef CONFIG_IP_MULTICAST
 208         INIT_LIST_HEAD(&card->ipm_list);
 209 #endif
 210         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 211         return card;
 212 }
 213
 214 /*
 215  * Setup read channel.
 216  */
 217 static void
 218 lcs_setup_read_ccws(struct lcs_card *card)
 219 {
 220         int cnt;
 221
 222         LCS_DBF_TEXT(2, setup, "ireadccw");
 223         /* Setup read ccws. */
 224         memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
 225         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 226                 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
 227                 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
 228                 card->read.ccws[cnt].flags =
 229                         CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
 230                 /*
 231                  * Note: we have allocated the buffer with GFP_DMA, so
 232                  * we do not need to do set_normalized_cda.
 233                  */
 234                 card->read.ccws[cnt].cda =
 235                         (__u32) __pa(card->read.iob[cnt].data);
 236                 ((struct lcs_header *)
 237                  card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
 238                 card->read.iob[cnt].callback = lcs_get_frames_cb;
 239                 card->read.iob[cnt].state = BUF_STATE_READY;
 240                 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
 241         }
 242         card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
 243         card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
 244         card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
 245         /* Last ccw is a tic (transfer in channel). */
 246         card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 247         card->read.ccws[LCS_NUM_BUFFS].cda =
 248                 (__u32) __pa(card->read.ccws);
 249         /* Setg initial state of the read channel. */
 250         card->read.state = CH_STATE_INIT;
 251
 252         card->read.io_idx = 0;
 253         card->read.buf_idx = 0;
 254 }
 255
 256 static void
 257 lcs_setup_read(struct lcs_card *card)
 258 {
 259         LCS_DBF_TEXT(3, setup, "initread");
 260
 261         lcs_setup_read_ccws(card);
 262         /* Initialize read channel tasklet. */
 263         card->read.irq_tasklet.data = (unsigned long) &card->read;
 264         card->read.irq_tasklet.func = lcs_tasklet;
 265         /* Initialize waitqueue. */
 266         init_waitqueue_head(&card->read.wait_q);
 267 }
 268
 269 /*
 270  * Setup write channel.
 271  */
 272 static void
 273 lcs_setup_write_ccws(struct lcs_card *card)
 274 {
 275         int cnt;
 276
 277         LCS_DBF_TEXT(3, setup, "iwritccw");
 278         /* Setup write ccws. */
 279         memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
 280         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 281                 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
 282                 card->write.ccws[cnt].count = 0;
 283                 card->write.ccws[cnt].flags =
 284                         CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
 285                 /*
 286                  * Note: we have allocated the buffer with GFP_DMA, so
 287                  * we do not need to do set_normalized_cda.
 288                  */
 289                 card->write.ccws[cnt].cda =
 290                         (__u32) __pa(card->write.iob[cnt].data);
 291         }
 292         /* Last ccw is a tic (transfer in channel). */
 293         card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 294         card->write.ccws[LCS_NUM_BUFFS].cda =
 295                 (__u32) __pa(card->write.ccws);
 296         /* Set initial state of the write channel. */
 297         card->read.state = CH_STATE_INIT;
 298
 299         card->write.io_idx = 0;
 300         card->write.buf_idx = 0;
 301 }
 302
 303 static void
 304 lcs_setup_write(struct lcs_card *card)
 305 {
 306         LCS_DBF_TEXT(3, setup, "initwrit");
 307
 308         lcs_setup_write_ccws(card);
 309         /* Initialize write channel tasklet. */
 310         card->write.irq_tasklet.data = (unsigned long) &card->write;
 311         card->write.irq_tasklet.func = lcs_tasklet;
 312         /* Initialize waitqueue. */
 313         init_waitqueue_head(&card->write.wait_q);
 314 }
 315
 316 static void
 317 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
 318 {
 319         unsigned long flags;
 320
 321         spin_lock_irqsave(&card->mask_lock, flags);
 322         card->thread_allowed_mask = threads;
 323         spin_unlock_irqrestore(&card->mask_lock, flags);
 324         wake_up(&card->wait_q);
 325 }
 326 static inline int
 327 lcs_threads_running(struct lcs_card *card, unsigned long threads)
 328 {
 329         unsigned long flags;
 330         int rc = 0;
 331
 332         spin_lock_irqsave(&card->mask_lock, flags);
 333         rc = (card->thread_running_mask & threads);
 334         spin_unlock_irqrestore(&card->mask_lock, flags);
 335         return rc;
 336 }
 337
 338 static int
 339 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
 340 {
 341         return wait_event_interruptible(card->wait_q,
 342                         lcs_threads_running(card, threads) == 0);
 343 }
 344
 345 static inline int
 346 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
 347 {
 348         unsigned long flags;
 349
 350         spin_lock_irqsave(&card->mask_lock, flags);
 351         if ( !(card->thread_allowed_mask & thread) ||
 352               (card->thread_start_mask & thread) ) {
 353                 spin_unlock_irqrestore(&card->mask_lock, flags);
 354                 return -EPERM;
 355         }
 356         card->thread_start_mask |= thread;
 357         spin_unlock_irqrestore(&card->mask_lock, flags);
 358         return 0;
 359 }
 360
 361 static void
 362 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
 363 {
 364         unsigned long flags;
 365
 366         spin_lock_irqsave(&card->mask_lock, flags);
 367         card->thread_running_mask &= ~thread;
 368         spin_unlock_irqrestore(&card->mask_lock, flags);
 369         wake_up(&card->wait_q);
 370 }
 371
 372 static inline int
 373 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 374 {
 375         unsigned long flags;
 376         int rc = 0;
 377
 378         spin_lock_irqsave(&card->mask_lock, flags);
 379         if (card->thread_start_mask & thread){
 380                 if ((card->thread_allowed_mask & thread) &&
 381                     !(card->thread_running_mask & thread)){
 382                         rc = 1;
 383                         card->thread_start_mask &= ~thread;
 384                         card->thread_running_mask |= thread;
 385                 } else
 386                         rc = -EPERM;
 387         }
 388         spin_unlock_irqrestore(&card->mask_lock, flags);
 389         return rc;
 390 }
 391
 392 static int
 393 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 394 {
 395         int rc = 0;
 396         wait_event(card->wait_q,
 397                    (rc = __lcs_do_run_thread(card, thread)) >= 0);
 398         return rc;
 399 }
 400
 401 static int
 402 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
 403 {
 404         unsigned long flags;
 405         int rc = 0;
 406
 407         spin_lock_irqsave(&card->mask_lock, flags);
 408         LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
 409                         (u8) card->thread_start_mask,
 410                         (u8) card->thread_allowed_mask,
 411                         (u8) card->thread_running_mask);
 412         rc = (card->thread_start_mask & thread);
 413         spin_unlock_irqrestore(&card->mask_lock, flags);
 414         return rc;
 415 }
 416
 417 /**
 418  * Initialize channels,card and state machines.
 419  */
 420 static void
 421 lcs_setup_card(struct lcs_card *card)
 422 {
 423         LCS_DBF_TEXT(2, setup, "initcard");
 424         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 425
 426         lcs_setup_read(card);
 427         lcs_setup_write(card);
 428         /* Set cards initial state. */
 429         card->state = DEV_STATE_DOWN;
 430         card->tx_buffer = NULL;
 431         card->tx_emitted = 0;
 432
 433         init_waitqueue_head(&card->wait_q);
 434         spin_lock_init(&card->lock);
 435         spin_lock_init(&card->ipm_lock);
 436         spin_lock_init(&card->mask_lock);
 437 #ifdef CONFIG_IP_MULTICAST
 438         INIT_LIST_HEAD(&card->ipm_list);
 439 #endif
 440         INIT_LIST_HEAD(&card->lancmd_waiters);
 441 }
 442
 443 static inline void
 444 lcs_clear_multicast_list(struct lcs_card *card)
 445 {
 446 #ifdef  CONFIG_IP_MULTICAST
 447         struct lcs_ipm_list *ipm;
 448         unsigned long flags;
 449
 450         /* Free multicast list. */
 451         LCS_DBF_TEXT(3, setup, "clmclist");
 452         spin_lock_irqsave(&card->ipm_lock, flags);
 453         while (!list_empty(&card->ipm_list)){
 454                 ipm = list_entry(card->ipm_list.next,
 455                                  struct lcs_ipm_list, list);
 456                 list_del(&ipm->list);
 457                 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
 458                         spin_unlock_irqrestore(&card->ipm_lock, flags);
 459                         lcs_send_delipm(card, ipm);
 460                         spin_lock_irqsave(&card->ipm_lock, flags);
 461                 }
 462                 kfree(ipm);
 463         }
 464         spin_unlock_irqrestore(&card->ipm_lock, flags);
 465 #endif
 466 }
 467 /**
 468  * Cleanup channels,card and state machines.
 469  */
 470 static void
 471 lcs_cleanup_card(struct lcs_card *card)
 472 {
 473
 474         LCS_DBF_TEXT(3, setup, "cleancrd");
 475         LCS_DBF_HEX(2,setup,&card,sizeof(void*));
 476
 477         if (card->dev != NULL)
 478                 free_netdev(card->dev);
 479         /* Cleanup channels. */
 480         lcs_cleanup_channel(&card->write);
 481         lcs_cleanup_channel(&card->read);
 482 }
 483
 484 /**
 485  * Start channel.
 486  */
 487 static int
 488 lcs_start_channel(struct lcs_channel *channel)
 489 {
 490         unsigned long flags;
 491         int rc;
 492
 493         LCS_DBF_TEXT_(4,trace,"ssch%s", channel->ccwdev->dev.bus_id);
 494         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 495         rc = ccw_device_start(channel->ccwdev,
 496                               channel->ccws + channel->io_idx, 0, 0,
 497                               DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
 498         if (rc == 0)
 499                 channel->state = CH_STATE_RUNNING;
 500         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 501         if (rc) {
 502                 LCS_DBF_TEXT_(4,trace,"essh%s", channel->ccwdev->dev.bus_id);
 503                 PRINT_ERR("Error in starting channel, rc=%d!\n", rc);
 504         }
 505         return rc;
 506 }
 507
 508 static int
 509 lcs_clear_channel(struct lcs_channel *channel)
 510 {
 511         unsigned long flags;
 512         int rc;
 513
 514         LCS_DBF_TEXT(4,trace,"clearch");
 515         LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
 516         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 517         rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
 518         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 519         if (rc) {
 520                 LCS_DBF_TEXT_(4,trace,"ecsc%s", channel->ccwdev->dev.bus_id);
 521                 return rc;
 522         }
 523         wait_event(channel->wait_q, (channel->state == CH_STATE_CLEARED));
 524         channel->state = CH_STATE_STOPPED;
 525         return rc;
 526 }
 527
 528
 529 /**
 530  * Stop channel.
 531  */
 532 static int
 533 lcs_stop_channel(struct lcs_channel *channel)
 534 {
 535         unsigned long flags;
 536         int rc;
 537
 538         if (channel->state == CH_STATE_STOPPED)
 539                 return 0;
 540         LCS_DBF_TEXT(4,trace,"haltsch");
 541         LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
 542         channel->state = CH_STATE_INIT;
 543         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 544         rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
 545         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 546         if (rc) {
 547                 LCS_DBF_TEXT_(4,trace,"ehsc%s", channel->ccwdev->dev.bus_id);
 548                 return rc;
 549         }
 550         /* Asynchronous halt initialted. Wait for its completion. */
 551         wait_event(channel->wait_q, (channel->state == CH_STATE_HALTED));
 552         lcs_clear_channel(channel);
 553         return 0;
 554 }
 555
 556 /**
 557  * start read and write channel
 558  */
 559 static int
 560 lcs_start_channels(struct lcs_card *card)
 561 {
 562         int rc;
 563
 564         LCS_DBF_TEXT(2, trace, "chstart");
 565         /* start read channel */
 566         rc = lcs_start_channel(&card->read);
 567         if (rc)
 568                 return rc;
 569         /* start write channel */
 570         rc = lcs_start_channel(&card->write);
 571         if (rc)
 572                 lcs_stop_channel(&card->read);
 573         return rc;
 574 }
 575
 576 /**
 577  * stop read and write channel
 578  */
 579 static int
 580 lcs_stop_channels(struct lcs_card *card)
 581 {
 582         LCS_DBF_TEXT(2, trace, "chhalt");
 583         lcs_stop_channel(&card->read);
 584         lcs_stop_channel(&card->write);
 585         return 0;
 586 }
 587
 588 /**
 589  * Get empty buffer.
 590  */
 591 static struct lcs_buffer *
 592 __lcs_get_buffer(struct lcs_channel *channel)
 593 {
 594         int index;
 595
 596         LCS_DBF_TEXT(5, trace, "_getbuff");
 597         index = channel->io_idx;
 598         do {
 599                 if (channel->iob[index].state == BUF_STATE_EMPTY) {
 600                         channel->iob[index].state = BUF_STATE_LOCKED;
 601                         return channel->iob + index;
 602                 }
 603                 index = (index + 1) & (LCS_NUM_BUFFS - 1);
 604         } while (index != channel->io_idx);
 605         return NULL;
 606 }
 607
 608 static struct lcs_buffer *
 609 lcs_get_buffer(struct lcs_channel *channel)
 610 {
 611         struct lcs_buffer *buffer;
 612         unsigned long flags;
 613
 614         LCS_DBF_TEXT(5, trace, "getbuff");
 615         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 616         buffer = __lcs_get_buffer(channel);
 617         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 618         return buffer;
 619 }
 620
 621 /**
 622  * Resume channel program if the channel is suspended.
 623  */
 624 static int
 625 __lcs_resume_channel(struct lcs_channel *channel)
 626 {
 627         int rc;
 628
 629         if (channel->state != CH_STATE_SUSPENDED)
 630                 return 0;
 631         if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
 632                 return 0;
 633         LCS_DBF_TEXT_(5, trace, "rsch%s", channel->ccwdev->dev.bus_id);
 634         rc = ccw_device_resume(channel->ccwdev);
 635         if (rc) {
 636                 LCS_DBF_TEXT_(4, trace, "ersc%s", channel->ccwdev->dev.bus_id);
 637                 PRINT_ERR("Error in lcs_resume_channel: rc=%d\n",rc);
 638         } else
 639                 channel->state = CH_STATE_RUNNING;
 640         return rc;
 641
 642 }
 643
 644 /**
 645  * Make a buffer ready for processing.
 646  */
 647 static inline void
 648 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
 649 {
 650         int prev, next;
 651
 652         LCS_DBF_TEXT(5, trace, "rdybits");
 653         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 654         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 655         /* Check if we may clear the suspend bit of this buffer. */
 656         if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
 657                 /* Check if we have to set the PCI bit. */
 658                 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
 659                         /* Suspend bit of the previous buffer is not set. */
 660                         channel->ccws[index].flags |= CCW_FLAG_PCI;
 661                 /* Suspend bit of the next buffer is set. */
 662                 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
 663         }
 664 }
 665
 666 static int
 667 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 668 {
 669         unsigned long flags;
 670         int index, rc;
 671
 672         LCS_DBF_TEXT(5, trace, "rdybuff");
 673         if (buffer->state != BUF_STATE_LOCKED &&
 674             buffer->state != BUF_STATE_PROCESSED)
 675                 BUG();
 676         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 677         buffer->state = BUF_STATE_READY;
 678         index = buffer - channel->iob;
 679         /* Set length. */
 680         channel->ccws[index].count = buffer->count;
 681         /* Check relevant PCI/suspend bits. */
 682         __lcs_ready_buffer_bits(channel, index);
 683         rc = __lcs_resume_channel(channel);
 684         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 685         return rc;
 686 }
 687
 688 /**
 689  * Mark the buffer as processed. Take care of the suspend bit
 690  * of the previous buffer. This function is called from
 691  * interrupt context, so the lock must not be taken.
 692  */
 693 static int
 694 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 695 {
 696         int index, prev, next;
 697
 698         LCS_DBF_TEXT(5, trace, "prcsbuff");
 699         if (buffer->state != BUF_STATE_READY)
 700                 BUG();
 701         buffer->state = BUF_STATE_PROCESSED;
 702         index = buffer - channel->iob;
 703         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 704         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 705         /* Set the suspend bit and clear the PCI bit of this buffer. */
 706         channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
 707         channel->ccws[index].flags &= ~CCW_FLAG_PCI;
 708         /* Check the suspend bit of the previous buffer. */
 709         if (channel->iob[prev].state == BUF_STATE_READY) {
 710                 /*
 711                  * Previous buffer is in state ready. It might have
 712                  * happened in lcs_ready_buffer that the suspend bit
 713                  * has not been cleared to avoid an endless loop.
 714                  * Do it now.
 715                  */
 716                 __lcs_ready_buffer_bits(channel, prev);
 717         }
 718         /* Clear PCI bit of next buffer. */
 719         channel->ccws[next].flags &= ~CCW_FLAG_PCI;
 720         return __lcs_resume_channel(channel);
 721 }
 722
 723 /**
 724  * Put a processed buffer back to state empty.
 725  */
 726 static void
 727 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 728 {
 729         unsigned long flags;
 730
 731         LCS_DBF_TEXT(5, trace, "relbuff");
 732         if (buffer->state != BUF_STATE_LOCKED &&
 733             buffer->state != BUF_STATE_PROCESSED)
 734                 BUG();
 735         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 736         buffer->state = BUF_STATE_EMPTY;
 737         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 738 }
 739
 740 /**
 741  * Get buffer for a lan command.
 742  */
 743 static struct lcs_buffer *
 744 lcs_get_lancmd(struct lcs_card *card, int count)
 745 {
 746         struct lcs_buffer *buffer;
 747         struct lcs_cmd *cmd;
 748
 749         LCS_DBF_TEXT(4, trace, "getlncmd");
 750         /* Get buffer and wait if none is available. */
 751         wait_event(card->write.wait_q,
 752                    ((buffer = lcs_get_buffer(&card->write)) != NULL));
 753         count += sizeof(struct lcs_header);
 754         *(__u16 *)(buffer->data + count) = 0;
 755         buffer->count = count + sizeof(__u16);
 756         buffer->callback = lcs_release_buffer;
 757         cmd = (struct lcs_cmd *) buffer->data;
 758         cmd->offset = count;
 759         cmd->type = LCS_FRAME_TYPE_CONTROL;
 760         cmd->slot = 0;
 761         return buffer;
 762 }
 763
 764
 765 static void
 766 lcs_get_reply(struct lcs_reply *reply)
 767 {
 768         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 769         atomic_inc(&reply->refcnt);
 770 }
 771
 772 static void
 773 lcs_put_reply(struct lcs_reply *reply)
 774 {
 775         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 776         if (atomic_dec_and_test(&reply->refcnt)) {
 777                 kfree(reply);
 778         }
 779
 780 }
 781
 782 static struct lcs_reply *
 783 lcs_alloc_reply(struct lcs_cmd *cmd)
 784 {
 785         struct lcs_reply *reply;
 786
 787         LCS_DBF_TEXT(4, trace, "getreply");
 788
 789         reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
 790         if (!reply)
 791                 return NULL;
 792         atomic_set(&reply->refcnt,1);
 793         reply->sequence_no = cmd->sequence_no;
 794         reply->received = 0;
 795         reply->rc = 0;
 796         init_waitqueue_head(&reply->wait_q);
 797
 798         return reply;
 799 }
 800
 801 /**
 802  * Notifier function for lancmd replies. Called from read irq.
 803  */
 804 static void
 805 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
 806 {
 807         struct list_head *l, *n;
 808         struct lcs_reply *reply;
 809
 810         LCS_DBF_TEXT(4, trace, "notiwait");
 811         spin_lock(&card->lock);
 812         list_for_each_safe(l, n, &card->lancmd_waiters) {
 813                 reply = list_entry(l, struct lcs_reply, list);
 814                 if (reply->sequence_no == cmd->sequence_no) {
 815                         lcs_get_reply(reply);
 816                         list_del_init(&reply->list);
 817                         if (reply->callback != NULL)
 818                                 reply->callback(card, cmd);
 819                         reply->received = 1;
 820                         reply->rc = cmd->return_code;
 821                         wake_up(&reply->wait_q);
 822                         lcs_put_reply(reply);
 823                         break;
 824                 }
 825         }
 826         spin_unlock(&card->lock);
 827 }
 828
 829 /**
 830  * Emit buffer of a lan comand.
 831  */
 832 void
 833 lcs_lancmd_timeout(unsigned long data)
 834 {
 835         struct lcs_reply *reply, *list_reply, *r;
 836         unsigned long flags;
 837
 838         LCS_DBF_TEXT(4, trace, "timeout");
 839         reply = (struct lcs_reply *) data;
 840         spin_lock_irqsave(&reply->card->lock, flags);
 841         list_for_each_entry_safe(list_reply, r,
 842                                  &reply->card->lancmd_waiters,list) {
 843                 if (reply == list_reply) {
 844                         lcs_get_reply(reply);
 845                         list_del_init(&reply->list);
 846                         spin_unlock_irqrestore(&reply->card->lock, flags);
 847                         reply->received = 1;
 848                         reply->rc = -ETIME;
 849                         wake_up(&reply->wait_q);
 850                         lcs_put_reply(reply);
 851                         return;
 852                 }
 853         }
 854         spin_unlock_irqrestore(&reply->card->lock, flags);
 855 }
 856
 857 static int
 858 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
 859                 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
 860 {
 861         struct lcs_reply *reply;
 862         struct lcs_cmd *cmd;
 863         struct timer_list timer;
 864         unsigned long flags;
 865         int rc;
 866
 867         LCS_DBF_TEXT(4, trace, "sendcmd");
 868         cmd = (struct lcs_cmd *) buffer->data;
 869         cmd->return_code = 0;
 870         cmd->sequence_no = card->sequence_no++;
 871         reply = lcs_alloc_reply(cmd);
 872         if (!reply)
 873                 return -ENOMEM;
 874         reply->callback = reply_callback;
 875         reply->card = card;
 876         spin_lock_irqsave(&card->lock, flags);
 877         list_add_tail(&reply->list, &card->lancmd_waiters);
 878         spin_unlock_irqrestore(&card->lock, flags);
 879
 880         buffer->callback = lcs_release_buffer;
 881         rc = lcs_ready_buffer(&card->write, buffer);
 882         if (rc)
 883                 return rc;
 884         init_timer(&timer);
 885         timer.function = lcs_lancmd_timeout;
 886         timer.data = (unsigned long) reply;
 887         timer.expires = jiffies + HZ*card->lancmd_timeout;
 888         add_timer(&timer);
 889         wait_event(reply->wait_q, reply->received);
 890         del_timer_sync(&timer);
 891         LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
 892         rc = reply->rc;
 893         lcs_put_reply(reply);
 894         return rc ? -EIO : 0;
 895 }
 896
 897 /**
 898  * LCS startup command
 899  */
 900 static int
 901 lcs_send_startup(struct lcs_card *card, __u8 initiator)
 902 {
 903         struct lcs_buffer *buffer;
 904         struct lcs_cmd *cmd;
 905
 906         LCS_DBF_TEXT(2, trace, "startup");
 907         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 908         cmd = (struct lcs_cmd *) buffer->data;
 909         cmd->cmd_code = LCS_CMD_STARTUP;
 910         cmd->initiator = initiator;
 911         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
 912         return lcs_send_lancmd(card, buffer, NULL);
 913 }
 914
 915 /**
 916  * LCS shutdown command
 917  */
 918 static int
 919 lcs_send_shutdown(struct lcs_card *card)
 920 {
 921         struct lcs_buffer *buffer;
 922         struct lcs_cmd *cmd;
 923
 924         LCS_DBF_TEXT(2, trace, "shutdown");
 925         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 926         cmd = (struct lcs_cmd *) buffer->data;
 927         cmd->cmd_code = LCS_CMD_SHUTDOWN;
 928         cmd->initiator = LCS_INITIATOR_TCPIP;
 929         return lcs_send_lancmd(card, buffer, NULL);
 930 }
 931
 932 /**
 933  * LCS lanstat command
 934  */
 935 static void
 936 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 937 {
 938         LCS_DBF_TEXT(2, trace, "statcb");
 939         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
 940 }
 941
 942 static int
 943 lcs_send_lanstat(struct lcs_card *card)
 944 {
 945         struct lcs_buffer *buffer;
 946         struct lcs_cmd *cmd;
 947
 948         LCS_DBF_TEXT(2,trace, "cmdstat");
 949         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 950         cmd = (struct lcs_cmd *) buffer->data;
 951         /* Setup lanstat command. */
 952         cmd->cmd_code = LCS_CMD_LANSTAT;
 953         cmd->initiator = LCS_INITIATOR_TCPIP;
 954         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 955         cmd->cmd.lcs_std_cmd.portno = card->portno;
 956         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
 957 }
 958
 959 /**
 960  * send stoplan command
 961  */
 962 static int
 963 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
 964 {
 965         struct lcs_buffer *buffer;
 966         struct lcs_cmd *cmd;
 967
 968         LCS_DBF_TEXT(2, trace, "cmdstpln");
 969         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 970         cmd = (struct lcs_cmd *) buffer->data;
 971         cmd->cmd_code = LCS_CMD_STOPLAN;
 972         cmd->initiator = initiator;
 973         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 974         cmd->cmd.lcs_std_cmd.portno = card->portno;
 975         return lcs_send_lancmd(card, buffer, NULL);
 976 }
 977
 978 /**
 979  * send startlan command
 980  */
 981 static void
 982 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 983 {
 984         LCS_DBF_TEXT(2, trace, "srtlancb");
 985         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
 986         card->portno = cmd->cmd.lcs_std_cmd.portno;
 987 }
 988
 989 static int
 990 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
 991 {
 992         struct lcs_buffer *buffer;
 993         struct lcs_cmd *cmd;
 994
 995         LCS_DBF_TEXT(2, trace, "cmdstaln");
 996         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 997         cmd = (struct lcs_cmd *) buffer->data;
 998         cmd->cmd_code = LCS_CMD_STARTLAN;
 999         cmd->initiator = initiator;
1000         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1001         cmd->cmd.lcs_std_cmd.portno = card->portno;
1002         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1003 }
1004
1005 #ifdef CONFIG_IP_MULTICAST
1006 /**
1007  * send setipm command (Multicast)
1008  */
1009 static int
1010 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1011 {
1012         struct lcs_buffer *buffer;
1013         struct lcs_cmd *cmd;
1014
1015         LCS_DBF_TEXT(2, trace, "cmdsetim");
1016         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1017         cmd = (struct lcs_cmd *) buffer->data;
1018         cmd->cmd_code = LCS_CMD_SETIPM;
1019         cmd->initiator = LCS_INITIATOR_TCPIP;
1020         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1021         cmd->cmd.lcs_qipassist.portno = card->portno;
1022         cmd->cmd.lcs_qipassist.version = 4;
1023         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1024         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1025                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1026         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1027         return lcs_send_lancmd(card, buffer, NULL);
1028 }
1029
1030 /**
1031  * send delipm command (Multicast)
1032  */
1033 static int
1034 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1035 {
1036         struct lcs_buffer *buffer;
1037         struct lcs_cmd *cmd;
1038
1039         LCS_DBF_TEXT(2, trace, "cmddelim");
1040         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1041         cmd = (struct lcs_cmd *) buffer->data;
1042         cmd->cmd_code = LCS_CMD_DELIPM;
1043         cmd->initiator = LCS_INITIATOR_TCPIP;
1044         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1045         cmd->cmd.lcs_qipassist.portno = card->portno;
1046         cmd->cmd.lcs_qipassist.version = 4;
1047         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1048         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1049                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1050         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1051         return lcs_send_lancmd(card, buffer, NULL);
1052 }
1053
1054 /**
1055  * check if multicast is supported by LCS
1056  */
1057 static void
1058 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1059 {
1060         LCS_DBF_TEXT(2, trace, "chkmccb");
1061         card->ip_assists_supported =
1062                 cmd->cmd.lcs_qipassist.ip_assists_supported;
1063         card->ip_assists_enabled =
1064                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1065 }
1066
1067 static int
1068 lcs_check_multicast_support(struct lcs_card *card)
1069 {
1070         struct lcs_buffer *buffer;
1071         struct lcs_cmd *cmd;
1072         int rc;
1073
1074         LCS_DBF_TEXT(2, trace, "cmdqipa");
1075         /* Send query ipassist. */
1076         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1077         cmd = (struct lcs_cmd *) buffer->data;
1078         cmd->cmd_code = LCS_CMD_QIPASSIST;
1079         cmd->initiator = LCS_INITIATOR_TCPIP;
1080         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1081         cmd->cmd.lcs_qipassist.portno = card->portno;
1082         cmd->cmd.lcs_qipassist.version = 4;
1083         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1084         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1085         if (rc != 0) {
1086                 PRINT_ERR("Query IPAssist failed. Assuming unsupported!\n");
1087                 return -EOPNOTSUPP;
1088         }
1089         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1090                 return 0;
1091         return -EOPNOTSUPP;
1092 }
1093
1094 /**
1095  * set or del multicast address on LCS card
1096  */
1097 static void
1098 lcs_fix_multicast_list(struct lcs_card *card)
1099 {
1100         struct list_head failed_list;
1101         struct lcs_ipm_list *ipm, *tmp;
1102         unsigned long flags;
1103         int rc;
1104
1105         LCS_DBF_TEXT(4,trace, "fixipm");
1106         INIT_LIST_HEAD(&failed_list);
1107         spin_lock_irqsave(&card->ipm_lock, flags);
1108 list_modified:
1109         list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1110                 switch (ipm->ipm_state) {
1111                 case LCS_IPM_STATE_SET_REQUIRED:
1112                         /* del from ipm_list so noone else can tamper with
1113                          * this entry */
1114                         list_del_init(&ipm->list);
1115                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1116                         rc = lcs_send_setipm(card, ipm);
1117                         spin_lock_irqsave(&card->ipm_lock, flags);
1118                         if (rc) {
1119                                 PRINT_INFO("Adding multicast address failed."
1120                                            "Table possibly full!\n");
1121                                 /* store ipm in failed list -> will be added
1122                                  * to ipm_list again, so a retry will be done
1123                                  * during the next call of this function */
1124                                 list_add_tail(&ipm->list, &failed_list);
1125                         } else {
1126                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1127                                 /* re-insert into ipm_list */
1128                                 list_add_tail(&ipm->list, &card->ipm_list);
1129                         }
1130                         goto list_modified;
1131                 case LCS_IPM_STATE_DEL_REQUIRED:
1132                         list_del(&ipm->list);
1133                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1134                         lcs_send_delipm(card, ipm);
1135                         spin_lock_irqsave(&card->ipm_lock, flags);
1136                         kfree(ipm);
1137                         goto list_modified;
1138                 case LCS_IPM_STATE_ON_CARD:
1139                         break;
1140                 }
1141         }
1142         /* re-insert all entries from the failed_list into ipm_list */
1143         list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1144                 list_move_tail(&ipm->list, &card->ipm_list);
1145
1146         spin_unlock_irqrestore(&card->ipm_lock, flags);
1147 }
1148
1149 /**
1150  * get mac address for the relevant Multicast address
1151  */
1152 static void
1153 lcs_get_mac_for_ipm(__u32 ipm, char *mac, struct net_device *dev)
1154 {
1155         LCS_DBF_TEXT(4,trace, "getmac");
1156         if (dev->type == ARPHRD_IEEE802_TR)
1157                 ip_tr_mc_map(ipm, mac);
1158         else
1159                 ip_eth_mc_map(ipm, mac);
1160 }
1161
1162 /**
1163  * function called by net device to handle multicast address relevant things
1164  */
1165 static inline void
1166 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1167 {
1168         struct ip_mc_list *im4;
1169         struct list_head *l;
1170         struct lcs_ipm_list *ipm;
1171         unsigned long flags;
1172         char buf[MAX_ADDR_LEN];
1173
1174         LCS_DBF_TEXT(4, trace, "remmclst");
1175         spin_lock_irqsave(&card->ipm_lock, flags);
1176         list_for_each(l, &card->ipm_list) {
1177                 ipm = list_entry(l, struct lcs_ipm_list, list);
1178                 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
1179                         lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1180                         if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1181                              (memcmp(buf, &ipm->ipm.mac_addr,
1182                                      LCS_MAC_LENGTH) == 0) )
1183                                 break;
1184                 }
1185                 if (im4 == NULL)
1186                         ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1187         }
1188         spin_unlock_irqrestore(&card->ipm_lock, flags);
1189 }
1190
1191 static inline struct lcs_ipm_list *
1192 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1193 {
1194         struct lcs_ipm_list *tmp, *ipm = NULL;
1195         struct list_head *l;
1196         unsigned long flags;
1197
1198         LCS_DBF_TEXT(4, trace, "chkmcent");
1199         spin_lock_irqsave(&card->ipm_lock, flags);
1200         list_for_each(l, &card->ipm_list) {
1201                 tmp = list_entry(l, struct lcs_ipm_list, list);
1202                 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1203                      (memcmp(buf, &tmp->ipm.mac_addr,
1204                              LCS_MAC_LENGTH) == 0) ) {
1205                         ipm = tmp;
1206                         break;
1207                 }
1208         }
1209         spin_unlock_irqrestore(&card->ipm_lock, flags);
1210         return ipm;
1211 }
1212
1213 static inline void
1214 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1215 {
1216
1217         struct ip_mc_list *im4;
1218         struct lcs_ipm_list *ipm;
1219         char buf[MAX_ADDR_LEN];
1220         unsigned long flags;
1221
1222         LCS_DBF_TEXT(4, trace, "setmclst");
1223         for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
1224                 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1225                 ipm = lcs_check_addr_entry(card, im4, buf);
1226                 if (ipm != NULL)
1227                         continue;       /* Address already in list. */
1228                 ipm = (struct lcs_ipm_list *)
1229                         kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1230                 if (ipm == NULL) {
1231                         PRINT_INFO("Not enough memory to add "
1232                                    "new multicast entry!\n");
1233                         break;
1234                 }
1235                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1236                 ipm->ipm.ip_addr = im4->multiaddr;
1237                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1238                 spin_lock_irqsave(&card->ipm_lock, flags);
1239                 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1240                 list_add(&ipm->list, &card->ipm_list);
1241                 spin_unlock_irqrestore(&card->ipm_lock, flags);
1242         }
1243 }
1244
1245 static int
1246 lcs_register_mc_addresses(void *data)
1247 {
1248         struct lcs_card *card;
1249         struct in_device *in4_dev;
1250
1251         card = (struct lcs_card *) data;
1252         daemonize("regipm");
1253
1254         if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1255                 return 0;
1256         LCS_DBF_TEXT(4, trace, "regmulti");
1257
1258         in4_dev = in_dev_get(card->dev);
1259         if (in4_dev == NULL)
1260                 goto out;
1261         read_lock(&in4_dev->mc_list_lock);
1262         lcs_remove_mc_addresses(card,in4_dev);
1263         lcs_set_mc_addresses(card, in4_dev);
1264         read_unlock(&in4_dev->mc_list_lock);
1265         in_dev_put(in4_dev);
1266
1267         netif_carrier_off(card->dev);
1268         netif_tx_disable(card->dev);
1269         wait_event(card->write.wait_q,
1270                         (card->write.state != CH_STATE_RUNNING));
1271         lcs_fix_multicast_list(card);
1272         if (card->state == DEV_STATE_UP) {
1273                 netif_carrier_on(card->dev);
1274                 netif_wake_queue(card->dev);
1275         }
1276 out:
1277         lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1278         return 0;
1279 }
1280 /**
1281  * function called by net device to
1282  * handle multicast address relevant things
1283  */
1284 static void
1285 lcs_set_multicast_list(struct net_device *dev)
1286 {
1287         struct lcs_card *card;
1288
1289         LCS_DBF_TEXT(4, trace, "setmulti");
1290         card = (struct lcs_card *) dev->priv;
1291
1292         if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1293                 schedule_work(&card->kernel_thread_starter);
1294 }
1295
1296 #endif /* CONFIG_IP_MULTICAST */
1297
1298 static long
1299 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1300 {
1301         if (!IS_ERR(irb))
1302                 return 0;
1303
1304         switch (PTR_ERR(irb)) {
1305         case -EIO:
1306                 PRINT_WARN("i/o-error on device %s\n", cdev->dev.bus_id);
1307                 LCS_DBF_TEXT(2, trace, "ckirberr");
1308                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1309                 break;
1310         case -ETIMEDOUT:
1311                 PRINT_WARN("timeout on device %s\n", cdev->dev.bus_id);
1312                 LCS_DBF_TEXT(2, trace, "ckirberr");
1313                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1314                 break;
1315         default:
1316                 PRINT_WARN("unknown error %ld on device %s\n", PTR_ERR(irb),
1317                            cdev->dev.bus_id);
1318                 LCS_DBF_TEXT(2, trace, "ckirberr");
1319                 LCS_DBF_TEXT(2, trace, "  rc???");
1320         }
1321         return PTR_ERR(irb);
1322 }
1323
1324 static int
1325 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1326 {
1327         int dstat, cstat;
1328         char *sense;
1329
1330         sense = (char *) irb->ecw;
1331         cstat = irb->scsw.cstat;
1332         dstat = irb->scsw.dstat;
1333
1334         if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1335                      SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1336                      SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
1337                 LCS_DBF_TEXT(2, trace, "CGENCHK");
1338                 return 1;
1339         }
1340         if (dstat & DEV_STAT_UNIT_CHECK) {
1341                 if (sense[LCS_SENSE_BYTE_1] &
1342                     LCS_SENSE_RESETTING_EVENT) {
1343                         LCS_DBF_TEXT(2, trace, "REVIND");
1344                         return 1;
1345                 }
1346                 if (sense[LCS_SENSE_BYTE_0] &
1347                     LCS_SENSE_CMD_REJECT) {
1348                         LCS_DBF_TEXT(2, trace, "CMDREJ");
1349                         return 0;
1350                 }
1351                 if ((!sense[LCS_SENSE_BYTE_0]) &&
1352                     (!sense[LCS_SENSE_BYTE_1]) &&
1353                     (!sense[LCS_SENSE_BYTE_2]) &&
1354                     (!sense[LCS_SENSE_BYTE_3])) {
1355                         LCS_DBF_TEXT(2, trace, "ZEROSEN");
1356                         return 0;
1357                 }
1358                 LCS_DBF_TEXT(2, trace, "DGENCHK");
1359                 return 1;
1360         }
1361         return 0;
1362 }
1363
1364 void
1365 lcs_schedule_recovery(struct lcs_card *card)
1366 {
1367         LCS_DBF_TEXT(2, trace, "startrec");
1368         if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1369                 schedule_work(&card->kernel_thread_starter);
1370 }
1371
1372 /**
1373  * IRQ Handler for LCS channels
1374  */
1375 static void
1376 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1377 {
1378         struct lcs_card *card;
1379         struct lcs_channel *channel;
1380         int rc, index;
1381         int cstat, dstat;
1382
1383         if (lcs_check_irb_error(cdev, irb))
1384                 return;
1385
1386         card = CARD_FROM_DEV(cdev);
1387         if (card->read.ccwdev == cdev)
1388                 channel = &card->read;
1389         else
1390                 channel = &card->write;
1391
1392         cstat = irb->scsw.cstat;
1393         dstat = irb->scsw.dstat;
1394         LCS_DBF_TEXT_(5, trace, "Rint%s",cdev->dev.bus_id);
1395         LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.cstat, irb->scsw.dstat);
1396         LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.fctl, irb->scsw.actl);
1397
1398         /* Check for channel and device errors presented */
1399         rc = lcs_get_problem(cdev, irb);
1400         if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1401                 PRINT_WARN("check on device %s, dstat=0x%X, cstat=0x%X \n",
1402                             cdev->dev.bus_id, dstat, cstat);
1403                 if (rc) {
1404                         lcs_schedule_recovery(card);
1405                         wake_up(&card->wait_q);
1406                         return;
1407                 }
1408         }
1409         /* How far in the ccw chain have we processed? */
1410         if ((channel->state != CH_STATE_INIT) &&
1411             (irb->scsw.fctl & SCSW_FCTL_START_FUNC)) {
1412                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cpa)
1413                         - channel->ccws;
1414                 if ((irb->scsw.actl & SCSW_ACTL_SUSPENDED) ||
1415                     (irb->scsw.cstat & SCHN_STAT_PCI))
1416                         /* Bloody io subsystem tells us lies about cpa... */
1417                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1418                 while (channel->io_idx != index) {
1419                         __lcs_processed_buffer(channel,
1420                                                channel->iob + channel->io_idx);
1421                         channel->io_idx =
1422                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1423                 }
1424         }
1425
1426         if ((irb->scsw.dstat & DEV_STAT_DEV_END) ||
1427             (irb->scsw.dstat & DEV_STAT_CHN_END) ||
1428             (irb->scsw.dstat & DEV_STAT_UNIT_CHECK))
1429                 /* Mark channel as stopped. */
1430                 channel->state = CH_STATE_STOPPED;
1431         else if (irb->scsw.actl & SCSW_ACTL_SUSPENDED)
1432                 /* CCW execution stopped on a suspend bit. */
1433                 channel->state = CH_STATE_SUSPENDED;
1434         if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) {
1435                 if (irb->scsw.cc != 0) {
1436                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1437                         return;
1438                 }
1439                 /* The channel has been stopped by halt_IO. */
1440                 channel->state = CH_STATE_HALTED;
1441         }
1442         if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) {
1443                 channel->state = CH_STATE_CLEARED;
1444         }
1445         /* Do the rest in the tasklet. */
1446         tasklet_schedule(&channel->irq_tasklet);
1447 }
1448
1449 /**
1450  * Tasklet for IRQ handler
1451  */
1452 static void
1453 lcs_tasklet(unsigned long data)
1454 {
1455         unsigned long flags;
1456         struct lcs_channel *channel;
1457         struct lcs_buffer *iob;
1458         int buf_idx;
1459         int rc;
1460
1461         channel = (struct lcs_channel *) data;
1462         LCS_DBF_TEXT_(5, trace, "tlet%s",channel->ccwdev->dev.bus_id);
1463
1464         /* Check for processed buffers. */
1465         iob = channel->iob;
1466         buf_idx = channel->buf_idx;
1467         while (iob[buf_idx].state == BUF_STATE_PROCESSED) {
1468                 /* Do the callback thing. */
1469                 if (iob[buf_idx].callback != NULL)
1470                         iob[buf_idx].callback(channel, iob + buf_idx);
1471                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1472         }
1473         channel->buf_idx = buf_idx;
1474
1475         if (channel->state == CH_STATE_STOPPED)
1476                 // FIXME: what if rc != 0 ??
1477                 rc = lcs_start_channel(channel);
1478         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1479         if (channel->state == CH_STATE_SUSPENDED &&
1480             channel->iob[channel->io_idx].state == BUF_STATE_READY) {
1481                 // FIXME: what if rc != 0 ??
1482                 rc = __lcs_resume_channel(channel);
1483         }
1484         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1485
1486         /* Something happened on the channel. Wake up waiters. */
1487         wake_up(&channel->wait_q);
1488 }
1489
1490 /**
1491  * Finish current tx buffer and make it ready for transmit.
1492  */
1493 static void
1494 __lcs_emit_txbuffer(struct lcs_card *card)
1495 {
1496         LCS_DBF_TEXT(5, trace, "emittx");
1497         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1498         card->tx_buffer->count += 2;
1499         lcs_ready_buffer(&card->write, card->tx_buffer);
1500         card->tx_buffer = NULL;
1501         card->tx_emitted++;
1502 }
1503
1504 /**
1505  * Callback for finished tx buffers.
1506  */
1507 static void
1508 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1509 {
1510         struct lcs_card *card;
1511
1512         LCS_DBF_TEXT(5, trace, "txbuffcb");
1513         /* Put buffer back to pool. */
1514         lcs_release_buffer(channel, buffer);
1515         card = (struct lcs_card *)
1516                 ((char *) channel - offsetof(struct lcs_card, write));
1517         if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1518                 netif_wake_queue(card->dev);
1519         spin_lock(&card->lock);
1520         card->tx_emitted--;
1521         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1522                 /*
1523                  * Last running tx buffer has finished. Submit partially
1524                  * filled current buffer.
1525                  */
1526                 __lcs_emit_txbuffer(card);
1527         spin_unlock(&card->lock);
1528 }
1529
1530 /**
1531  * Packet transmit function called by network stack
1532  */
1533 static int
1534 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1535                  struct net_device *dev)
1536 {
1537         struct lcs_header *header;
1538         int rc = 0;
1539
1540         LCS_DBF_TEXT(5, trace, "hardxmit");
1541         if (skb == NULL) {
1542                 card->stats.tx_dropped++;
1543                 card->stats.tx_errors++;
1544                 return -EIO;
1545         }
1546         if (card->state != DEV_STATE_UP) {
1547                 dev_kfree_skb(skb);
1548                 card->stats.tx_dropped++;
1549                 card->stats.tx_errors++;
1550                 card->stats.tx_carrier_errors++;
1551                 return 0;
1552         }
1553         if (skb->protocol == htons(ETH_P_IPV6)) {
1554                 dev_kfree_skb(skb);
1555                 return 0;
1556         }
1557         netif_stop_queue(card->dev);
1558         spin_lock(&card->lock);
1559         if (card->tx_buffer != NULL &&
1560             card->tx_buffer->count + sizeof(struct lcs_header) +
1561             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1562                 /* skb too big for current tx buffer. */
1563                 __lcs_emit_txbuffer(card);
1564         if (card->tx_buffer == NULL) {
1565                 /* Get new tx buffer */
1566                 card->tx_buffer = lcs_get_buffer(&card->write);
1567                 if (card->tx_buffer == NULL) {
1568                         card->stats.tx_dropped++;
1569                         rc = -EBUSY;
1570                         goto out;
1571                 }
1572                 card->tx_buffer->callback = lcs_txbuffer_cb;
1573                 card->tx_buffer->count = 0;
1574         }
1575         header = (struct lcs_header *)
1576                 (card->tx_buffer->data + card->tx_buffer->count);
1577         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1578         header->offset = card->tx_buffer->count;
1579         header->type = card->lan_type;
1580         header->slot = card->portno;
1581         memcpy(header + 1, skb->data, skb->len);
1582         spin_unlock(&card->lock);
1583         card->stats.tx_bytes += skb->len;
1584         card->stats.tx_packets++;
1585         dev_kfree_skb(skb);
1586         netif_wake_queue(card->dev);
1587         spin_lock(&card->lock);
1588         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1589                 /* If this is the first tx buffer emit it immediately. */
1590                 __lcs_emit_txbuffer(card);
1591 out:
1592         spin_unlock(&card->lock);
1593         return rc;
1594 }
1595
1596 static int
1597 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1598 {
1599         struct lcs_card *card;
1600         int rc;
1601
1602         LCS_DBF_TEXT(5, trace, "pktxmit");
1603         card = (struct lcs_card *) dev->priv;
1604         rc = __lcs_start_xmit(card, skb, dev);
1605         return rc;
1606 }
1607
1608 /**
1609  * send startlan and lanstat command to make LCS device ready
1610  */
1611 static int
1612 lcs_startlan_auto(struct lcs_card *card)
1613 {
1614         int rc;
1615
1616         LCS_DBF_TEXT(2, trace, "strtauto");
1617 #ifdef CONFIG_NET_ETHERNET
1618         card->lan_type = LCS_FRAME_TYPE_ENET;
1619         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1620         if (rc == 0)
1621                 return 0;
1622
1623 #endif
1624 #ifdef CONFIG_TR
1625         card->lan_type = LCS_FRAME_TYPE_TR;
1626         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1627         if (rc == 0)
1628                 return 0;
1629 #endif
1630 #ifdef CONFIG_FDDI
1631         card->lan_type = LCS_FRAME_TYPE_FDDI;
1632         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1633         if (rc == 0)
1634                 return 0;
1635 #endif
1636         return -EIO;
1637 }
1638
1639 static int
1640 lcs_startlan(struct lcs_card *card)
1641 {
1642         int rc, i;
1643
1644         LCS_DBF_TEXT(2, trace, "startlan");
1645         rc = 0;
1646         if (card->portno != LCS_INVALID_PORT_NO) {
1647                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1648                         rc = lcs_startlan_auto(card);
1649                 else
1650                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1651         } else {
1652                 for (i = 0; i <= 16; i++) {
1653                         card->portno = i;
1654                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1655                                 rc = lcs_send_startlan(card,
1656                                                        LCS_INITIATOR_TCPIP);
1657                         else
1658                                 /* autodetecting lan type */
1659                                 rc = lcs_startlan_auto(card);
1660                         if (rc == 0)
1661                                 break;
1662                 }
1663         }
1664         if (rc == 0)
1665                 return lcs_send_lanstat(card);
1666         return rc;
1667 }
1668
1669 /**
1670  * LCS detect function
1671  * setup channels and make them I/O ready
1672  */
1673 static int
1674 lcs_detect(struct lcs_card *card)
1675 {
1676         int rc = 0;
1677
1678         LCS_DBF_TEXT(2, setup, "lcsdetct");
1679         /* start/reset card */
1680         if (card->dev)
1681                 netif_stop_queue(card->dev);
1682         rc = lcs_stop_channels(card);
1683         if (rc == 0) {
1684                 rc = lcs_start_channels(card);
1685                 if (rc == 0) {
1686                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1687                         if (rc == 0)
1688                                 rc = lcs_startlan(card);
1689                 }
1690         }
1691         if (rc == 0) {
1692                 card->state = DEV_STATE_UP;
1693         } else {
1694                 card->state = DEV_STATE_DOWN;
1695                 card->write.state = CH_STATE_INIT;
1696                 card->read.state =  CH_STATE_INIT;
1697         }
1698         return rc;
1699 }
1700
1701 /**
1702  * LCS Stop card
1703  */
1704 static int
1705 lcs_stopcard(struct lcs_card *card)
1706 {
1707         int rc;
1708
1709         LCS_DBF_TEXT(3, setup, "stopcard");
1710
1711         if (card->read.state != CH_STATE_STOPPED &&
1712             card->write.state != CH_STATE_STOPPED &&
1713             card->state == DEV_STATE_UP) {
1714                 lcs_clear_multicast_list(card);
1715                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1716                 rc = lcs_send_shutdown(card);
1717         }
1718         rc = lcs_stop_channels(card);
1719         card->state = DEV_STATE_DOWN;
1720
1721         return rc;
1722 }
1723
1724 /**
1725  * Kernel Thread helper functions for LGW initiated commands
1726  */
1727 static void
1728 lcs_start_kernel_thread(struct lcs_card *card)
1729 {
1730         LCS_DBF_TEXT(5, trace, "krnthrd");
1731         if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1732                 kernel_thread(lcs_recovery, (void *) card, SIGCHLD);
1733 #ifdef CONFIG_IP_MULTICAST
1734         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1735                 kernel_thread(lcs_register_mc_addresses,
1736                                 (void *) card, SIGCHLD);
1737 #endif
1738 }
1739
1740 /**
1741  * Process control frames.
1742  */
1743 static void
1744 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1745 {
1746         LCS_DBF_TEXT(5, trace, "getctrl");
1747         if (cmd->initiator == LCS_INITIATOR_LGW) {
1748                 switch(cmd->cmd_code) {
1749                 case LCS_CMD_STARTUP:
1750                 case LCS_CMD_STARTLAN:
1751                         lcs_schedule_recovery(card);
1752                         break;
1753                 case LCS_CMD_STOPLAN:
1754                         PRINT_WARN("Stoplan for %s initiated by LGW.\n",
1755                                         card->dev->name);
1756                         if (card->dev)
1757                                 netif_carrier_off(card->dev);
1758                         break;
1759                 default:
1760                         PRINT_INFO("UNRECOGNIZED LGW COMMAND\n");
1761                         break;
1762                 }
1763         } else
1764                 lcs_notify_lancmd_waiters(card, cmd);
1765 }
1766
1767 /**
1768  * Unpack network packet.
1769  */
1770 static void
1771 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1772 {
1773         struct sk_buff *skb;
1774
1775         LCS_DBF_TEXT(5, trace, "getskb");
1776         if (card->dev == NULL ||
1777             card->state != DEV_STATE_UP)
1778                 /* The card isn't up. Ignore the packet. */
1779                 return;
1780
1781         skb = dev_alloc_skb(skb_len);
1782         if (skb == NULL) {
1783                 PRINT_ERR("LCS: alloc_skb failed for device=%s\n",
1784                           card->dev->name);
1785                 card->stats.rx_dropped++;
1786                 return;
1787         }
1788         skb->dev = card->dev;
1789         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1790         skb->protocol = card->lan_type_trans(skb, card->dev);
1791         card->stats.rx_bytes += skb_len;
1792         card->stats.rx_packets++;
1793         *((__u32 *)skb->cb) = ++card->pkt_seq;
1794         netif_rx(skb);
1795 }
1796
1797 /**
1798  * LCS main routine to get packets and lancmd replies from the buffers
1799  */
1800 static void
1801 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1802 {
1803         struct lcs_card *card;
1804         struct lcs_header *lcs_hdr;
1805         __u16 offset;
1806
1807         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1808         lcs_hdr = (struct lcs_header *) buffer->data;
1809         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1810                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1811                 return;
1812         }
1813         card = (struct lcs_card *)
1814                 ((char *) channel - offsetof(struct lcs_card, read));
1815         offset = 0;
1816         while (lcs_hdr->offset != 0) {
1817                 if (lcs_hdr->offset <= 0 ||
1818                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1819                     lcs_hdr->offset < offset) {
1820                         /* Offset invalid. */
1821                         card->stats.rx_length_errors++;
1822                         card->stats.rx_errors++;
1823                         return;
1824                 }
1825                 /* What kind of frame is it? */
1826                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1827                         /* Control frame. */
1828                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1829                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1830                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1831                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1832                         /* Normal network packet. */
1833                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1834                                     lcs_hdr->offset - offset -
1835                                     sizeof(struct lcs_header));
1836                 else
1837                         /* Unknown frame type. */
1838                         ; // FIXME: error message ?
1839                 /* Proceed to next frame. */
1840                 offset = lcs_hdr->offset;
1841                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1842                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1843         }
1844         /* The buffer is now empty. Make it ready again. */
1845         lcs_ready_buffer(&card->read, buffer);
1846 }
1847
1848 /**
1849  * get network statistics for ifconfig and other user programs
1850  */
1851 static struct net_device_stats *
1852 lcs_getstats(struct net_device *dev)
1853 {
1854         struct lcs_card *card;
1855
1856         LCS_DBF_TEXT(4, trace, "netstats");
1857         card = (struct lcs_card *) dev->priv;
1858         return &card->stats;
1859 }
1860
1861 /**
1862  * stop lcs device
1863  * This function will be called by user doing ifconfig xxx down
1864  */
1865 static int
1866 lcs_stop_device(struct net_device *dev)
1867 {
1868         struct lcs_card *card;
1869         int rc;
1870
1871         LCS_DBF_TEXT(2, trace, "stopdev");
1872         card   = (struct lcs_card *) dev->priv;
1873         netif_carrier_off(dev);
1874         netif_tx_disable(dev);
1875         dev->flags &= ~IFF_UP;
1876         wait_event(card->write.wait_q,
1877                 (card->write.state != CH_STATE_RUNNING));
1878         rc = lcs_stopcard(card);
1879         if (rc)
1880                 PRINT_ERR("Try it again!\n ");
1881         return rc;
1882 }
1883
1884 /**
1885  * start lcs device and make it runnable
1886  * This function will be called by user doing ifconfig xxx up
1887  */
1888 static int
1889 lcs_open_device(struct net_device *dev)
1890 {
1891         struct lcs_card *card;
1892         int rc;
1893
1894         LCS_DBF_TEXT(2, trace, "opendev");
1895         card = (struct lcs_card *) dev->priv;
1896         /* initialize statistics */
1897         rc = lcs_detect(card);
1898         if (rc) {
1899                 PRINT_ERR("LCS:Error in opening device!\n");
1900
1901         } else {
1902                 dev->flags |= IFF_UP;
1903                 netif_carrier_on(dev);
1904                 netif_wake_queue(dev);
1905                 card->state = DEV_STATE_UP;
1906         }
1907         return rc;
1908 }
1909
1910 /**
1911  * show function for portno called by cat or similar things
1912  */
1913 static ssize_t
1914 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1915 {
1916         struct lcs_card *card;
1917
1918         card = (struct lcs_card *)dev->driver_data;
1919
1920         if (!card)
1921                 return 0;
1922
1923         return sprintf(buf, "%d\n", card->portno);
1924 }
1925
1926 /**
1927  * store the value which is piped to file portno
1928  */
1929 static ssize_t
1930 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1931 {
1932         struct lcs_card *card;
1933         int value;
1934
1935         card = (struct lcs_card *)dev->driver_data;
1936
1937         if (!card)
1938                 return 0;
1939
1940         sscanf(buf, "%u", &value);
1941         /* TODO: sanity checks */
1942         card->portno = value;
1943
1944         return count;
1945
1946 }
1947
1948 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1949
1950 static ssize_t
1951 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1952 {
1953         struct ccwgroup_device *cgdev;
1954
1955         cgdev = to_ccwgroupdev(dev);
1956         if (!cgdev)
1957                 return -ENODEV;
1958
1959         return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
1960 }
1961
1962 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1963
1964 static ssize_t
1965 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1966 {
1967         struct lcs_card *card;
1968
1969         card = (struct lcs_card *)dev->driver_data;
1970
1971         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1972 }
1973
1974 static ssize_t
1975 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1976 {
1977         struct lcs_card *card;
1978         int value;
1979
1980         card = (struct lcs_card *)dev->driver_data;
1981
1982         if (!card)
1983                 return 0;
1984
1985         sscanf(buf, "%u", &value);
1986         /* TODO: sanity checks */
1987         card->lancmd_timeout = value;
1988
1989         return count;
1990
1991 }
1992
1993 DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
1994
1995 static ssize_t
1996 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
1997                       const char *buf, size_t count)
1998 {
1999         struct lcs_card *card = dev->driver_data;
2000         char *tmp;
2001         int i;
2002
2003         if (!card)
2004                 return -EINVAL;
2005         if (card->state != DEV_STATE_UP)
2006                 return -EPERM;
2007         i = simple_strtoul(buf, &tmp, 16);
2008         if (i == 1)
2009                 lcs_schedule_recovery(card);
2010         return count;
2011 }
2012
2013 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2014
2015 static struct attribute * lcs_attrs[] = {
2016         &dev_attr_portno.attr,
2017         &dev_attr_type.attr,
2018         &dev_attr_lancmd_timeout.attr,
2019         &dev_attr_recover.attr,
2020         NULL,
2021 };
2022
2023 static struct attribute_group lcs_attr_group = {
2024         .attrs = lcs_attrs,
2025 };
2026
2027 /**
2028  * lcs_probe_device is called on establishing a new ccwgroup_device.
2029  */
2030 static int
2031 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2032 {
2033         struct lcs_card *card;
2034         int ret;
2035
2036         if (!get_device(&ccwgdev->dev))
2037                 return -ENODEV;
2038
2039         LCS_DBF_TEXT(2, setup, "add_dev");
2040         card = lcs_alloc_card();
2041         if (!card) {
2042                 PRINT_ERR("Allocation of lcs card failed\n");
2043                 put_device(&ccwgdev->dev);
2044                 return -ENOMEM;
2045         }
2046         ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2047         if (ret) {
2048                 PRINT_ERR("Creating attributes failed");
2049                 lcs_free_card(card);
2050                 put_device(&ccwgdev->dev);
2051                 return ret;
2052         }
2053         ccwgdev->dev.driver_data = card;
2054         ccwgdev->cdev[0]->handler = lcs_irq;
2055         ccwgdev->cdev[1]->handler = lcs_irq;
2056         card->gdev = ccwgdev;
2057         INIT_WORK(&card->kernel_thread_starter,
2058                   (void *) lcs_start_kernel_thread, card);
2059         card->thread_start_mask = 0;
2060         card->thread_allowed_mask = 0;
2061         card->thread_running_mask = 0;
2062         return 0;
2063 }
2064
2065 static int
2066 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2067 {
2068         struct lcs_card *card;
2069
2070         LCS_DBF_TEXT(2, setup, "regnetdv");
2071         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2072         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2073                 return 0;
2074         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2075         return register_netdev(card->dev);
2076 }
2077
2078 /**
2079  * lcs_new_device will be called by setting the group device online.
2080  */
2081
2082 static int
2083 lcs_new_device(struct ccwgroup_device *ccwgdev)
2084 {
2085         struct  lcs_card *card;
2086         struct net_device *dev=NULL;
2087         enum lcs_dev_states recover_state;
2088         int rc;
2089
2090         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2091         if (!card)
2092                 return -ENODEV;
2093
2094         LCS_DBF_TEXT(2, setup, "newdev");
2095         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2096         card->read.ccwdev  = ccwgdev->cdev[0];
2097         card->write.ccwdev = ccwgdev->cdev[1];
2098
2099         recover_state = card->state;
2100         ccw_device_set_online(card->read.ccwdev);
2101         ccw_device_set_online(card->write.ccwdev);
2102
2103         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2104
2105         lcs_setup_card(card);
2106         rc = lcs_detect(card);
2107         if (rc) {
2108                 LCS_DBF_TEXT(2, setup, "dtctfail");
2109                 PRINT_WARN("Detection of LCS card failed with return code "
2110                            "%d (0x%x)\n", rc, rc);
2111                 lcs_stopcard(card);
2112                 goto out;
2113         }
2114         if (card->dev) {
2115                 LCS_DBF_TEXT(2, setup, "samedev");
2116                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2117                 goto netdev_out;
2118         }
2119         switch (card->lan_type) {
2120 #ifdef CONFIG_NET_ETHERNET
2121         case LCS_FRAME_TYPE_ENET:
2122                 card->lan_type_trans = eth_type_trans;
2123                 dev = alloc_etherdev(0);
2124                 break;
2125 #endif
2126 #ifdef CONFIG_TR
2127         case LCS_FRAME_TYPE_TR:
2128                 card->lan_type_trans = tr_type_trans;
2129                 dev = alloc_trdev(0);
2130                 break;
2131 #endif
2132 #ifdef CONFIG_FDDI
2133         case LCS_FRAME_TYPE_FDDI:
2134                 card->lan_type_trans = fddi_type_trans;
2135                 dev = alloc_fddidev(0);
2136                 break;
2137 #endif
2138         default:
2139                 LCS_DBF_TEXT(3, setup, "errinit");
2140                 PRINT_ERR("LCS: Initialization failed\n");
2141                 PRINT_ERR("LCS: No device found!\n");
2142                 goto out;
2143         }
2144         if (!dev)
2145                 goto out;
2146         card->dev = dev;
2147         card->dev->priv = card;
2148         card->dev->open = lcs_open_device;
2149         card->dev->stop = lcs_stop_device;
2150         card->dev->hard_start_xmit = lcs_start_xmit;
2151         card->dev->get_stats = lcs_getstats;
2152         SET_MODULE_OWNER(dev);
2153         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2154 #ifdef CONFIG_IP_MULTICAST
2155         if (!lcs_check_multicast_support(card))
2156                 card->dev->set_multicast_list = lcs_set_multicast_list;
2157 #endif
2158 netdev_out:
2159         lcs_set_allowed_threads(card,0xffffffff);
2160         if (recover_state == DEV_STATE_RECOVER) {
2161                 lcs_set_multicast_list(card->dev);
2162                 card->dev->flags |= IFF_UP;
2163                 netif_carrier_on(card->dev);
2164                 netif_wake_queue(card->dev);
2165                 card->state = DEV_STATE_UP;
2166         } else {
2167                 lcs_stopcard(card);
2168         }
2169
2170         if (lcs_register_netdev(ccwgdev) != 0)
2171                 goto out;
2172
2173         /* Print out supported assists: IPv6 */
2174         PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
2175                    (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2176                    "with" : "without");
2177         /* Print out supported assist: Multicast */
2178         PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
2179                    (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2180                    "with" : "without");
2181         return 0;
2182 out:
2183
2184         ccw_device_set_offline(card->read.ccwdev);
2185         ccw_device_set_offline(card->write.ccwdev);
2186         return -ENODEV;
2187 }
2188
2189 /**
2190  * lcs_shutdown_device, called when setting the group device offline.
2191  */
2192 static int
2193 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2194 {
2195         struct lcs_card *card;
2196         enum lcs_dev_states recover_state;
2197         int ret;
2198
2199         LCS_DBF_TEXT(3, setup, "shtdndev");
2200         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2201         if (!card)
2202                 return -ENODEV;
2203         if (recovery_mode == 0) {
2204                 lcs_set_allowed_threads(card, 0);
2205                 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2206                         return -ERESTARTSYS;
2207         }
2208         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2209         recover_state = card->state;
2210
2211         ret = lcs_stop_device(card->dev);
2212         ret = ccw_device_set_offline(card->read.ccwdev);
2213         ret = ccw_device_set_offline(card->write.ccwdev);
2214         if (recover_state == DEV_STATE_UP) {
2215                 card->state = DEV_STATE_RECOVER;
2216         }
2217         if (ret)
2218                 return ret;
2219         return 0;
2220 }
2221
2222 static int
2223 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2224 {
2225         return __lcs_shutdown_device(ccwgdev, 0);
2226 }
2227
2228 /**
2229  * drive lcs recovery after startup and startlan initiated by Lan Gateway
2230  */
2231 static int
2232 lcs_recovery(void *ptr)
2233 {
2234         struct lcs_card *card;
2235         struct ccwgroup_device *gdev;
2236         int rc;
2237
2238         card = (struct lcs_card *) ptr;
2239         daemonize("lcs_recover");
2240
2241         LCS_DBF_TEXT(4, trace, "recover1");
2242         if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2243                 return 0;
2244         LCS_DBF_TEXT(4, trace, "recover2");
2245         gdev = card->gdev;
2246         PRINT_WARN("Recovery of device %s started...\n", gdev->dev.bus_id);
2247         rc = __lcs_shutdown_device(gdev, 1);
2248         rc = lcs_new_device(gdev);
2249         if (!rc)
2250                 PRINT_INFO("Device %s successfully recovered!\n",
2251                                 card->dev->name);
2252         else
2253                 PRINT_INFO("Device %s could not be recovered!\n",
2254                                 card->dev->name);
2255         lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2256         return 0;
2257 }
2258
2259 /**
2260  * lcs_remove_device, free buffers and card
2261  */
2262 static void
2263 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2264 {
2265         struct lcs_card *card;
2266
2267         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2268         if (!card)
2269                 return;
2270
2271         PRINT_INFO("Removing lcs group device ....\n");
2272         LCS_DBF_TEXT(3, setup, "remdev");
2273         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2274         if (ccwgdev->state == CCWGROUP_ONLINE) {
2275                 lcs_shutdown_device(ccwgdev);
2276         }
2277         if (card->dev)
2278                 unregister_netdev(card->dev);
2279         sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2280         lcs_cleanup_card(card);
2281         lcs_free_card(card);
2282         put_device(&ccwgdev->dev);
2283 }
2284
2285 /**
2286  * LCS ccwgroup driver registration
2287  */
2288 static struct ccwgroup_driver lcs_group_driver = {
2289         .owner       = THIS_MODULE,
2290         .name        = "lcs",
2291         .max_slaves  = 2,
2292         .driver_id   = 0xD3C3E2,
2293         .probe       = lcs_probe_device,
2294         .remove      = lcs_remove_device,
2295         .set_online  = lcs_new_device,
2296         .set_offline = lcs_shutdown_device,
2297 };
2298
2299 /**
2300  *  LCS Module/Kernel initialization function
2301  */
2302 static int
2303 __init lcs_init_module(void)
2304 {
2305         int rc;
2306
2307         PRINT_INFO("Loading %s\n",version);
2308         rc = lcs_register_debug_facility();
2309         LCS_DBF_TEXT(0, setup, "lcsinit");
2310         if (rc) {
2311                 PRINT_ERR("Initialization failed\n");
2312                 return rc;
2313         }
2314
2315         rc = register_cu3088_discipline(&lcs_group_driver);
2316         if (rc) {
2317                 PRINT_ERR("Initialization failed\n");
2318                 return rc;
2319         }
2320         return 0;
2321 }
2322
2323
2324 /**
2325  *  LCS module cleanup function
2326  */
2327 static void
2328 __exit lcs_cleanup_module(void)
2329 {
2330         PRINT_INFO("Terminating lcs module.\n");
2331         LCS_DBF_TEXT(0, trace, "cleanup");
2332         unregister_cu3088_discipline(&lcs_group_driver);
2333         lcs_unregister_debug_facility();
2334 }
2335
2336 module_init(lcs_init_module);
2337 module_exit(lcs_cleanup_module);
2338
2339 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2340 MODULE_LICENSE("GPL");
2341