drivers/s390/net/lcs.c

   1 /*
   2  *  Linux for S/390 Lan Channel Station Network Driver
   3  *
   4  *  Copyright IBM Corp. 1999, 2009
   5  *  Author(s): Original Code written by
   6  *                      DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
   7  *             Rewritten by
   8  *                      Frank Pavlic <fpavlic@de.ibm.com> and
   9  *                      Martin Schwidefsky <schwidefsky@de.ibm.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2, or (at your option)
  14  * any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #define KMSG_COMPONENT          "lcs"
  27 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  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 <linux/kthread.h>
  40 #include <linux/slab.h>
  41 #include <net/arp.h>
  42 #include <net/ip.h>
  43
  44 #include <asm/debug.h>
  45 #include <asm/idals.h>
  46 #include <asm/timex.h>
  47 #include <linux/device.h>
  48 #include <asm/ccwgroup.h>
  49
  50 #include "lcs.h"
  51
  52
  53 #if !defined(CONFIG_NET_ETHERNET) && \
  54     !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
  55 #error Cannot compile lcs.c without some net devices switched on.
  56 #endif
  57
  58 /**
  59  * initialization string for output
  60  */
  61
  62 static char version[] __initdata = "LCS driver";
  63
  64 /**
  65   * the root device for lcs group devices
  66   */
  67 static struct device *lcs_root_dev;
  68
  69 /**
  70  * Some prototypes.
  71  */
  72 static void lcs_tasklet(unsigned long);
  73 static void lcs_start_kernel_thread(struct work_struct *);
  74 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
  75 #ifdef CONFIG_IP_MULTICAST
  76 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
  77 #endif /* CONFIG_IP_MULTICAST */
  78 static int lcs_recovery(void *ptr);
  79
  80 /**
  81  * Debug Facility Stuff
  82  */
  83 static char debug_buffer[255];
  84 static debug_info_t *lcs_dbf_setup;
  85 static debug_info_t *lcs_dbf_trace;
  86
  87 /**
  88  *  LCS Debug Facility functions
  89  */
  90 static void
  91 lcs_unregister_debug_facility(void)
  92 {
  93         if (lcs_dbf_setup)
  94                 debug_unregister(lcs_dbf_setup);
  95         if (lcs_dbf_trace)
  96                 debug_unregister(lcs_dbf_trace);
  97 }
  98
  99 static int
 100 lcs_register_debug_facility(void)
 101 {
 102         lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
 103         lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
 104         if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
 105                 pr_err("Not enough memory for debug facility.\n");
 106                 lcs_unregister_debug_facility();
 107                 return -ENOMEM;
 108         }
 109         debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
 110         debug_set_level(lcs_dbf_setup, 2);
 111         debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
 112         debug_set_level(lcs_dbf_trace, 2);
 113         return 0;
 114 }
 115
 116 /**
 117  * Allocate io buffers.
 118  */
 119 static int
 120 lcs_alloc_channel(struct lcs_channel *channel)
 121 {
 122         int cnt;
 123
 124         LCS_DBF_TEXT(2, setup, "ichalloc");
 125         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 126                 /* alloc memory fo iobuffer */
 127                 channel->iob[cnt].data =
 128                         kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
 129                 if (channel->iob[cnt].data == NULL)
 130                         break;
 131                 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
 132         }
 133         if (cnt < LCS_NUM_BUFFS) {
 134                 /* Not all io buffers could be allocated. */
 135                 LCS_DBF_TEXT(2, setup, "echalloc");
 136                 while (cnt-- > 0)
 137                         kfree(channel->iob[cnt].data);
 138                 return -ENOMEM;
 139         }
 140         return 0;
 141 }
 142
 143 /**
 144  * Free io buffers.
 145  */
 146 static void
 147 lcs_free_channel(struct lcs_channel *channel)
 148 {
 149         int cnt;
 150
 151         LCS_DBF_TEXT(2, setup, "ichfree");
 152         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 153                 kfree(channel->iob[cnt].data);
 154                 channel->iob[cnt].data = NULL;
 155         }
 156 }
 157
 158 /*
 159  * Cleanup channel.
 160  */
 161 static void
 162 lcs_cleanup_channel(struct lcs_channel *channel)
 163 {
 164         LCS_DBF_TEXT(3, setup, "cleanch");
 165         /* Kill write channel tasklets. */
 166         tasklet_kill(&channel->irq_tasklet);
 167         /* Free channel buffers. */
 168         lcs_free_channel(channel);
 169 }
 170
 171 /**
 172  * LCS free memory for card and channels.
 173  */
 174 static void
 175 lcs_free_card(struct lcs_card *card)
 176 {
 177         LCS_DBF_TEXT(2, setup, "remcard");
 178         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 179         kfree(card);
 180 }
 181
 182 /**
 183  * LCS alloc memory for card and channels
 184  */
 185 static struct lcs_card *
 186 lcs_alloc_card(void)
 187 {
 188         struct lcs_card *card;
 189         int rc;
 190
 191         LCS_DBF_TEXT(2, setup, "alloclcs");
 192
 193         card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
 194         if (card == NULL)
 195                 return NULL;
 196         card->lan_type = LCS_FRAME_TYPE_AUTO;
 197         card->pkt_seq = 0;
 198         card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
 199         /* Allocate io buffers for the read channel. */
 200         rc = lcs_alloc_channel(&card->read);
 201         if (rc){
 202                 LCS_DBF_TEXT(2, setup, "iccwerr");
 203                 lcs_free_card(card);
 204                 return NULL;
 205         }
 206         /* Allocate io buffers for the write channel. */
 207         rc = lcs_alloc_channel(&card->write);
 208         if (rc) {
 209                 LCS_DBF_TEXT(2, setup, "iccwerr");
 210                 lcs_cleanup_channel(&card->read);
 211                 lcs_free_card(card);
 212                 return NULL;
 213         }
 214
 215 #ifdef CONFIG_IP_MULTICAST
 216         INIT_LIST_HEAD(&card->ipm_list);
 217 #endif
 218         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 219         return card;
 220 }
 221
 222 /*
 223  * Setup read channel.
 224  */
 225 static void
 226 lcs_setup_read_ccws(struct lcs_card *card)
 227 {
 228         int cnt;
 229
 230         LCS_DBF_TEXT(2, setup, "ireadccw");
 231         /* Setup read ccws. */
 232         memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
 233         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 234                 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
 235                 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
 236                 card->read.ccws[cnt].flags =
 237                         CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
 238                 /*
 239                  * Note: we have allocated the buffer with GFP_DMA, so
 240                  * we do not need to do set_normalized_cda.
 241                  */
 242                 card->read.ccws[cnt].cda =
 243                         (__u32) __pa(card->read.iob[cnt].data);
 244                 ((struct lcs_header *)
 245                  card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
 246                 card->read.iob[cnt].callback = lcs_get_frames_cb;
 247                 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
 248                 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
 249         }
 250         card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
 251         card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
 252         card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
 253         /* Last ccw is a tic (transfer in channel). */
 254         card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 255         card->read.ccws[LCS_NUM_BUFFS].cda =
 256                 (__u32) __pa(card->read.ccws);
 257         /* Setg initial state of the read channel. */
 258         card->read.state = LCS_CH_STATE_INIT;
 259
 260         card->read.io_idx = 0;
 261         card->read.buf_idx = 0;
 262 }
 263
 264 static void
 265 lcs_setup_read(struct lcs_card *card)
 266 {
 267         LCS_DBF_TEXT(3, setup, "initread");
 268
 269         lcs_setup_read_ccws(card);
 270         /* Initialize read channel tasklet. */
 271         card->read.irq_tasklet.data = (unsigned long) &card->read;
 272         card->read.irq_tasklet.func = lcs_tasklet;
 273         /* Initialize waitqueue. */
 274         init_waitqueue_head(&card->read.wait_q);
 275 }
 276
 277 /*
 278  * Setup write channel.
 279  */
 280 static void
 281 lcs_setup_write_ccws(struct lcs_card *card)
 282 {
 283         int cnt;
 284
 285         LCS_DBF_TEXT(3, setup, "iwritccw");
 286         /* Setup write ccws. */
 287         memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
 288         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 289                 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
 290                 card->write.ccws[cnt].count = 0;
 291                 card->write.ccws[cnt].flags =
 292                         CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
 293                 /*
 294                  * Note: we have allocated the buffer with GFP_DMA, so
 295                  * we do not need to do set_normalized_cda.
 296                  */
 297                 card->write.ccws[cnt].cda =
 298                         (__u32) __pa(card->write.iob[cnt].data);
 299         }
 300         /* Last ccw is a tic (transfer in channel). */
 301         card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 302         card->write.ccws[LCS_NUM_BUFFS].cda =
 303                 (__u32) __pa(card->write.ccws);
 304         /* Set initial state of the write channel. */
 305         card->read.state = LCS_CH_STATE_INIT;
 306
 307         card->write.io_idx = 0;
 308         card->write.buf_idx = 0;
 309 }
 310
 311 static void
 312 lcs_setup_write(struct lcs_card *card)
 313 {
 314         LCS_DBF_TEXT(3, setup, "initwrit");
 315
 316         lcs_setup_write_ccws(card);
 317         /* Initialize write channel tasklet. */
 318         card->write.irq_tasklet.data = (unsigned long) &card->write;
 319         card->write.irq_tasklet.func = lcs_tasklet;
 320         /* Initialize waitqueue. */
 321         init_waitqueue_head(&card->write.wait_q);
 322 }
 323
 324 static void
 325 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
 326 {
 327         unsigned long flags;
 328
 329         spin_lock_irqsave(&card->mask_lock, flags);
 330         card->thread_allowed_mask = threads;
 331         spin_unlock_irqrestore(&card->mask_lock, flags);
 332         wake_up(&card->wait_q);
 333 }
 334 static inline int
 335 lcs_threads_running(struct lcs_card *card, unsigned long threads)
 336 {
 337         unsigned long flags;
 338         int rc = 0;
 339
 340         spin_lock_irqsave(&card->mask_lock, flags);
 341         rc = (card->thread_running_mask & threads);
 342         spin_unlock_irqrestore(&card->mask_lock, flags);
 343         return rc;
 344 }
 345
 346 static int
 347 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
 348 {
 349         return wait_event_interruptible(card->wait_q,
 350                         lcs_threads_running(card, threads) == 0);
 351 }
 352
 353 static inline int
 354 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
 355 {
 356         unsigned long flags;
 357
 358         spin_lock_irqsave(&card->mask_lock, flags);
 359         if ( !(card->thread_allowed_mask & thread) ||
 360               (card->thread_start_mask & thread) ) {
 361                 spin_unlock_irqrestore(&card->mask_lock, flags);
 362                 return -EPERM;
 363         }
 364         card->thread_start_mask |= thread;
 365         spin_unlock_irqrestore(&card->mask_lock, flags);
 366         return 0;
 367 }
 368
 369 static void
 370 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
 371 {
 372         unsigned long flags;
 373
 374         spin_lock_irqsave(&card->mask_lock, flags);
 375         card->thread_running_mask &= ~thread;
 376         spin_unlock_irqrestore(&card->mask_lock, flags);
 377         wake_up(&card->wait_q);
 378 }
 379
 380 static inline int
 381 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 382 {
 383         unsigned long flags;
 384         int rc = 0;
 385
 386         spin_lock_irqsave(&card->mask_lock, flags);
 387         if (card->thread_start_mask & thread){
 388                 if ((card->thread_allowed_mask & thread) &&
 389                     !(card->thread_running_mask & thread)){
 390                         rc = 1;
 391                         card->thread_start_mask &= ~thread;
 392                         card->thread_running_mask |= thread;
 393                 } else
 394                         rc = -EPERM;
 395         }
 396         spin_unlock_irqrestore(&card->mask_lock, flags);
 397         return rc;
 398 }
 399
 400 static int
 401 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 402 {
 403         int rc = 0;
 404         wait_event(card->wait_q,
 405                    (rc = __lcs_do_run_thread(card, thread)) >= 0);
 406         return rc;
 407 }
 408
 409 static int
 410 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
 411 {
 412         unsigned long flags;
 413         int rc = 0;
 414
 415         spin_lock_irqsave(&card->mask_lock, flags);
 416         LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
 417                         (u8) card->thread_start_mask,
 418                         (u8) card->thread_allowed_mask,
 419                         (u8) card->thread_running_mask);
 420         rc = (card->thread_start_mask & thread);
 421         spin_unlock_irqrestore(&card->mask_lock, flags);
 422         return rc;
 423 }
 424
 425 /**
 426  * Initialize channels,card and state machines.
 427  */
 428 static void
 429 lcs_setup_card(struct lcs_card *card)
 430 {
 431         LCS_DBF_TEXT(2, setup, "initcard");
 432         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 433
 434         lcs_setup_read(card);
 435         lcs_setup_write(card);
 436         /* Set cards initial state. */
 437         card->state = DEV_STATE_DOWN;
 438         card->tx_buffer = NULL;
 439         card->tx_emitted = 0;
 440
 441         init_waitqueue_head(&card->wait_q);
 442         spin_lock_init(&card->lock);
 443         spin_lock_init(&card->ipm_lock);
 444         spin_lock_init(&card->mask_lock);
 445 #ifdef CONFIG_IP_MULTICAST
 446         INIT_LIST_HEAD(&card->ipm_list);
 447 #endif
 448         INIT_LIST_HEAD(&card->lancmd_waiters);
 449 }
 450
 451 static inline void
 452 lcs_clear_multicast_list(struct lcs_card *card)
 453 {
 454 #ifdef  CONFIG_IP_MULTICAST
 455         struct lcs_ipm_list *ipm;
 456         unsigned long flags;
 457
 458         /* Free multicast list. */
 459         LCS_DBF_TEXT(3, setup, "clmclist");
 460         spin_lock_irqsave(&card->ipm_lock, flags);
 461         while (!list_empty(&card->ipm_list)){
 462                 ipm = list_entry(card->ipm_list.next,
 463                                  struct lcs_ipm_list, list);
 464                 list_del(&ipm->list);
 465                 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
 466                         spin_unlock_irqrestore(&card->ipm_lock, flags);
 467                         lcs_send_delipm(card, ipm);
 468                         spin_lock_irqsave(&card->ipm_lock, flags);
 469                 }
 470                 kfree(ipm);
 471         }
 472         spin_unlock_irqrestore(&card->ipm_lock, flags);
 473 #endif
 474 }
 475 /**
 476  * Cleanup channels,card and state machines.
 477  */
 478 static void
 479 lcs_cleanup_card(struct lcs_card *card)
 480 {
 481
 482         LCS_DBF_TEXT(3, setup, "cleancrd");
 483         LCS_DBF_HEX(2,setup,&card,sizeof(void*));
 484
 485         if (card->dev != NULL)
 486                 free_netdev(card->dev);
 487         /* Cleanup channels. */
 488         lcs_cleanup_channel(&card->write);
 489         lcs_cleanup_channel(&card->read);
 490 }
 491
 492 /**
 493  * Start channel.
 494  */
 495 static int
 496 lcs_start_channel(struct lcs_channel *channel)
 497 {
 498         unsigned long flags;
 499         int rc;
 500
 501         LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
 502         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 503         rc = ccw_device_start(channel->ccwdev,
 504                               channel->ccws + channel->io_idx, 0, 0,
 505                               DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
 506         if (rc == 0)
 507                 channel->state = LCS_CH_STATE_RUNNING;
 508         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 509         if (rc) {
 510                 LCS_DBF_TEXT_(4,trace,"essh%s",
 511                               dev_name(&channel->ccwdev->dev));
 512                 dev_err(&channel->ccwdev->dev,
 513                         "Starting an LCS device resulted in an error,"
 514                         " rc=%d!\n", rc);
 515         }
 516         return rc;
 517 }
 518
 519 static int
 520 lcs_clear_channel(struct lcs_channel *channel)
 521 {
 522         unsigned long flags;
 523         int rc;
 524
 525         LCS_DBF_TEXT(4,trace,"clearch");
 526         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
 527         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 528         rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
 529         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 530         if (rc) {
 531                 LCS_DBF_TEXT_(4, trace, "ecsc%s",
 532                               dev_name(&channel->ccwdev->dev));
 533                 return rc;
 534         }
 535         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
 536         channel->state = LCS_CH_STATE_STOPPED;
 537         return rc;
 538 }
 539
 540
 541 /**
 542  * Stop channel.
 543  */
 544 static int
 545 lcs_stop_channel(struct lcs_channel *channel)
 546 {
 547         unsigned long flags;
 548         int rc;
 549
 550         if (channel->state == LCS_CH_STATE_STOPPED)
 551                 return 0;
 552         LCS_DBF_TEXT(4,trace,"haltsch");
 553         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
 554         channel->state = LCS_CH_STATE_INIT;
 555         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 556         rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
 557         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 558         if (rc) {
 559                 LCS_DBF_TEXT_(4, trace, "ehsc%s",
 560                               dev_name(&channel->ccwdev->dev));
 561                 return rc;
 562         }
 563         /* Asynchronous halt initialted. Wait for its completion. */
 564         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
 565         lcs_clear_channel(channel);
 566         return 0;
 567 }
 568
 569 /**
 570  * start read and write channel
 571  */
 572 static int
 573 lcs_start_channels(struct lcs_card *card)
 574 {
 575         int rc;
 576
 577         LCS_DBF_TEXT(2, trace, "chstart");
 578         /* start read channel */
 579         rc = lcs_start_channel(&card->read);
 580         if (rc)
 581                 return rc;
 582         /* start write channel */
 583         rc = lcs_start_channel(&card->write);
 584         if (rc)
 585                 lcs_stop_channel(&card->read);
 586         return rc;
 587 }
 588
 589 /**
 590  * stop read and write channel
 591  */
 592 static int
 593 lcs_stop_channels(struct lcs_card *card)
 594 {
 595         LCS_DBF_TEXT(2, trace, "chhalt");
 596         lcs_stop_channel(&card->read);
 597         lcs_stop_channel(&card->write);
 598         return 0;
 599 }
 600
 601 /**
 602  * Get empty buffer.
 603  */
 604 static struct lcs_buffer *
 605 __lcs_get_buffer(struct lcs_channel *channel)
 606 {
 607         int index;
 608
 609         LCS_DBF_TEXT(5, trace, "_getbuff");
 610         index = channel->io_idx;
 611         do {
 612                 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
 613                         channel->iob[index].state = LCS_BUF_STATE_LOCKED;
 614                         return channel->iob + index;
 615                 }
 616                 index = (index + 1) & (LCS_NUM_BUFFS - 1);
 617         } while (index != channel->io_idx);
 618         return NULL;
 619 }
 620
 621 static struct lcs_buffer *
 622 lcs_get_buffer(struct lcs_channel *channel)
 623 {
 624         struct lcs_buffer *buffer;
 625         unsigned long flags;
 626
 627         LCS_DBF_TEXT(5, trace, "getbuff");
 628         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 629         buffer = __lcs_get_buffer(channel);
 630         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 631         return buffer;
 632 }
 633
 634 /**
 635  * Resume channel program if the channel is suspended.
 636  */
 637 static int
 638 __lcs_resume_channel(struct lcs_channel *channel)
 639 {
 640         int rc;
 641
 642         if (channel->state != LCS_CH_STATE_SUSPENDED)
 643                 return 0;
 644         if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
 645                 return 0;
 646         LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
 647         rc = ccw_device_resume(channel->ccwdev);
 648         if (rc) {
 649                 LCS_DBF_TEXT_(4, trace, "ersc%s",
 650                               dev_name(&channel->ccwdev->dev));
 651                 dev_err(&channel->ccwdev->dev,
 652                         "Sending data from the LCS device to the LAN failed"
 653                         " with rc=%d\n",rc);
 654         } else
 655                 channel->state = LCS_CH_STATE_RUNNING;
 656         return rc;
 657
 658 }
 659
 660 /**
 661  * Make a buffer ready for processing.
 662  */
 663 static inline void
 664 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
 665 {
 666         int prev, next;
 667
 668         LCS_DBF_TEXT(5, trace, "rdybits");
 669         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 670         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 671         /* Check if we may clear the suspend bit of this buffer. */
 672         if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
 673                 /* Check if we have to set the PCI bit. */
 674                 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
 675                         /* Suspend bit of the previous buffer is not set. */
 676                         channel->ccws[index].flags |= CCW_FLAG_PCI;
 677                 /* Suspend bit of the next buffer is set. */
 678                 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
 679         }
 680 }
 681
 682 static int
 683 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 684 {
 685         unsigned long flags;
 686         int index, rc;
 687
 688         LCS_DBF_TEXT(5, trace, "rdybuff");
 689         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 690                buffer->state != LCS_BUF_STATE_PROCESSED);
 691         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 692         buffer->state = LCS_BUF_STATE_READY;
 693         index = buffer - channel->iob;
 694         /* Set length. */
 695         channel->ccws[index].count = buffer->count;
 696         /* Check relevant PCI/suspend bits. */
 697         __lcs_ready_buffer_bits(channel, index);
 698         rc = __lcs_resume_channel(channel);
 699         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 700         return rc;
 701 }
 702
 703 /**
 704  * Mark the buffer as processed. Take care of the suspend bit
 705  * of the previous buffer. This function is called from
 706  * interrupt context, so the lock must not be taken.
 707  */
 708 static int
 709 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 710 {
 711         int index, prev, next;
 712
 713         LCS_DBF_TEXT(5, trace, "prcsbuff");
 714         BUG_ON(buffer->state != LCS_BUF_STATE_READY);
 715         buffer->state = LCS_BUF_STATE_PROCESSED;
 716         index = buffer - channel->iob;
 717         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 718         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 719         /* Set the suspend bit and clear the PCI bit of this buffer. */
 720         channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
 721         channel->ccws[index].flags &= ~CCW_FLAG_PCI;
 722         /* Check the suspend bit of the previous buffer. */
 723         if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
 724                 /*
 725                  * Previous buffer is in state ready. It might have
 726                  * happened in lcs_ready_buffer that the suspend bit
 727                  * has not been cleared to avoid an endless loop.
 728                  * Do it now.
 729                  */
 730                 __lcs_ready_buffer_bits(channel, prev);
 731         }
 732         /* Clear PCI bit of next buffer. */
 733         channel->ccws[next].flags &= ~CCW_FLAG_PCI;
 734         return __lcs_resume_channel(channel);
 735 }
 736
 737 /**
 738  * Put a processed buffer back to state empty.
 739  */
 740 static void
 741 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 742 {
 743         unsigned long flags;
 744
 745         LCS_DBF_TEXT(5, trace, "relbuff");
 746         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 747                buffer->state != LCS_BUF_STATE_PROCESSED);
 748         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 749         buffer->state = LCS_BUF_STATE_EMPTY;
 750         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 751 }
 752
 753 /**
 754  * Get buffer for a lan command.
 755  */
 756 static struct lcs_buffer *
 757 lcs_get_lancmd(struct lcs_card *card, int count)
 758 {
 759         struct lcs_buffer *buffer;
 760         struct lcs_cmd *cmd;
 761
 762         LCS_DBF_TEXT(4, trace, "getlncmd");
 763         /* Get buffer and wait if none is available. */
 764         wait_event(card->write.wait_q,
 765                    ((buffer = lcs_get_buffer(&card->write)) != NULL));
 766         count += sizeof(struct lcs_header);
 767         *(__u16 *)(buffer->data + count) = 0;
 768         buffer->count = count + sizeof(__u16);
 769         buffer->callback = lcs_release_buffer;
 770         cmd = (struct lcs_cmd *) buffer->data;
 771         cmd->offset = count;
 772         cmd->type = LCS_FRAME_TYPE_CONTROL;
 773         cmd->slot = 0;
 774         return buffer;
 775 }
 776
 777
 778 static void
 779 lcs_get_reply(struct lcs_reply *reply)
 780 {
 781         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 782         atomic_inc(&reply->refcnt);
 783 }
 784
 785 static void
 786 lcs_put_reply(struct lcs_reply *reply)
 787 {
 788         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 789         if (atomic_dec_and_test(&reply->refcnt)) {
 790                 kfree(reply);
 791         }
 792
 793 }
 794
 795 static struct lcs_reply *
 796 lcs_alloc_reply(struct lcs_cmd *cmd)
 797 {
 798         struct lcs_reply *reply;
 799
 800         LCS_DBF_TEXT(4, trace, "getreply");
 801
 802         reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
 803         if (!reply)
 804                 return NULL;
 805         atomic_set(&reply->refcnt,1);
 806         reply->sequence_no = cmd->sequence_no;
 807         reply->received = 0;
 808         reply->rc = 0;
 809         init_waitqueue_head(&reply->wait_q);
 810
 811         return reply;
 812 }
 813
 814 /**
 815  * Notifier function for lancmd replies. Called from read irq.
 816  */
 817 static void
 818 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
 819 {
 820         struct list_head *l, *n;
 821         struct lcs_reply *reply;
 822
 823         LCS_DBF_TEXT(4, trace, "notiwait");
 824         spin_lock(&card->lock);
 825         list_for_each_safe(l, n, &card->lancmd_waiters) {
 826                 reply = list_entry(l, struct lcs_reply, list);
 827                 if (reply->sequence_no == cmd->sequence_no) {
 828                         lcs_get_reply(reply);
 829                         list_del_init(&reply->list);
 830                         if (reply->callback != NULL)
 831                                 reply->callback(card, cmd);
 832                         reply->received = 1;
 833                         reply->rc = cmd->return_code;
 834                         wake_up(&reply->wait_q);
 835                         lcs_put_reply(reply);
 836                         break;
 837                 }
 838         }
 839         spin_unlock(&card->lock);
 840 }
 841
 842 /**
 843  * Emit buffer of a lan comand.
 844  */
 845 static void
 846 lcs_lancmd_timeout(unsigned long data)
 847 {
 848         struct lcs_reply *reply, *list_reply, *r;
 849         unsigned long flags;
 850
 851         LCS_DBF_TEXT(4, trace, "timeout");
 852         reply = (struct lcs_reply *) data;
 853         spin_lock_irqsave(&reply->card->lock, flags);
 854         list_for_each_entry_safe(list_reply, r,
 855                                  &reply->card->lancmd_waiters,list) {
 856                 if (reply == list_reply) {
 857                         lcs_get_reply(reply);
 858                         list_del_init(&reply->list);
 859                         spin_unlock_irqrestore(&reply->card->lock, flags);
 860                         reply->received = 1;
 861                         reply->rc = -ETIME;
 862                         wake_up(&reply->wait_q);
 863                         lcs_put_reply(reply);
 864                         return;
 865                 }
 866         }
 867         spin_unlock_irqrestore(&reply->card->lock, flags);
 868 }
 869
 870 static int
 871 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
 872                 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
 873 {
 874         struct lcs_reply *reply;
 875         struct lcs_cmd *cmd;
 876         struct timer_list timer;
 877         unsigned long flags;
 878         int rc;
 879
 880         LCS_DBF_TEXT(4, trace, "sendcmd");
 881         cmd = (struct lcs_cmd *) buffer->data;
 882         cmd->return_code = 0;
 883         cmd->sequence_no = card->sequence_no++;
 884         reply = lcs_alloc_reply(cmd);
 885         if (!reply)
 886                 return -ENOMEM;
 887         reply->callback = reply_callback;
 888         reply->card = card;
 889         spin_lock_irqsave(&card->lock, flags);
 890         list_add_tail(&reply->list, &card->lancmd_waiters);
 891         spin_unlock_irqrestore(&card->lock, flags);
 892
 893         buffer->callback = lcs_release_buffer;
 894         rc = lcs_ready_buffer(&card->write, buffer);
 895         if (rc)
 896                 return rc;
 897         init_timer_on_stack(&timer);
 898         timer.function = lcs_lancmd_timeout;
 899         timer.data = (unsigned long) reply;
 900         timer.expires = jiffies + HZ*card->lancmd_timeout;
 901         add_timer(&timer);
 902         wait_event(reply->wait_q, reply->received);
 903         del_timer_sync(&timer);
 904         LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
 905         rc = reply->rc;
 906         lcs_put_reply(reply);
 907         return rc ? -EIO : 0;
 908 }
 909
 910 /**
 911  * LCS startup command
 912  */
 913 static int
 914 lcs_send_startup(struct lcs_card *card, __u8 initiator)
 915 {
 916         struct lcs_buffer *buffer;
 917         struct lcs_cmd *cmd;
 918
 919         LCS_DBF_TEXT(2, trace, "startup");
 920         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 921         cmd = (struct lcs_cmd *) buffer->data;
 922         cmd->cmd_code = LCS_CMD_STARTUP;
 923         cmd->initiator = initiator;
 924         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
 925         return lcs_send_lancmd(card, buffer, NULL);
 926 }
 927
 928 /**
 929  * LCS shutdown command
 930  */
 931 static int
 932 lcs_send_shutdown(struct lcs_card *card)
 933 {
 934         struct lcs_buffer *buffer;
 935         struct lcs_cmd *cmd;
 936
 937         LCS_DBF_TEXT(2, trace, "shutdown");
 938         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 939         cmd = (struct lcs_cmd *) buffer->data;
 940         cmd->cmd_code = LCS_CMD_SHUTDOWN;
 941         cmd->initiator = LCS_INITIATOR_TCPIP;
 942         return lcs_send_lancmd(card, buffer, NULL);
 943 }
 944
 945 /**
 946  * LCS lanstat command
 947  */
 948 static void
 949 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 950 {
 951         LCS_DBF_TEXT(2, trace, "statcb");
 952         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
 953 }
 954
 955 static int
 956 lcs_send_lanstat(struct lcs_card *card)
 957 {
 958         struct lcs_buffer *buffer;
 959         struct lcs_cmd *cmd;
 960
 961         LCS_DBF_TEXT(2,trace, "cmdstat");
 962         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 963         cmd = (struct lcs_cmd *) buffer->data;
 964         /* Setup lanstat command. */
 965         cmd->cmd_code = LCS_CMD_LANSTAT;
 966         cmd->initiator = LCS_INITIATOR_TCPIP;
 967         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 968         cmd->cmd.lcs_std_cmd.portno = card->portno;
 969         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
 970 }
 971
 972 /**
 973  * send stoplan command
 974  */
 975 static int
 976 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
 977 {
 978         struct lcs_buffer *buffer;
 979         struct lcs_cmd *cmd;
 980
 981         LCS_DBF_TEXT(2, trace, "cmdstpln");
 982         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 983         cmd = (struct lcs_cmd *) buffer->data;
 984         cmd->cmd_code = LCS_CMD_STOPLAN;
 985         cmd->initiator = initiator;
 986         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 987         cmd->cmd.lcs_std_cmd.portno = card->portno;
 988         return lcs_send_lancmd(card, buffer, NULL);
 989 }
 990
 991 /**
 992  * send startlan command
 993  */
 994 static void
 995 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 996 {
 997         LCS_DBF_TEXT(2, trace, "srtlancb");
 998         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
 999         card->portno = cmd->cmd.lcs_std_cmd.portno;
1000 }
1001
1002 static int
1003 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1004 {
1005         struct lcs_buffer *buffer;
1006         struct lcs_cmd *cmd;
1007
1008         LCS_DBF_TEXT(2, trace, "cmdstaln");
1009         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1010         cmd = (struct lcs_cmd *) buffer->data;
1011         cmd->cmd_code = LCS_CMD_STARTLAN;
1012         cmd->initiator = initiator;
1013         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1014         cmd->cmd.lcs_std_cmd.portno = card->portno;
1015         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1016 }
1017
1018 #ifdef CONFIG_IP_MULTICAST
1019 /**
1020  * send setipm command (Multicast)
1021  */
1022 static int
1023 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1024 {
1025         struct lcs_buffer *buffer;
1026         struct lcs_cmd *cmd;
1027
1028         LCS_DBF_TEXT(2, trace, "cmdsetim");
1029         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1030         cmd = (struct lcs_cmd *) buffer->data;
1031         cmd->cmd_code = LCS_CMD_SETIPM;
1032         cmd->initiator = LCS_INITIATOR_TCPIP;
1033         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1034         cmd->cmd.lcs_qipassist.portno = card->portno;
1035         cmd->cmd.lcs_qipassist.version = 4;
1036         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1037         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1038                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1039         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1040         return lcs_send_lancmd(card, buffer, NULL);
1041 }
1042
1043 /**
1044  * send delipm command (Multicast)
1045  */
1046 static int
1047 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1048 {
1049         struct lcs_buffer *buffer;
1050         struct lcs_cmd *cmd;
1051
1052         LCS_DBF_TEXT(2, trace, "cmddelim");
1053         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1054         cmd = (struct lcs_cmd *) buffer->data;
1055         cmd->cmd_code = LCS_CMD_DELIPM;
1056         cmd->initiator = LCS_INITIATOR_TCPIP;
1057         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1058         cmd->cmd.lcs_qipassist.portno = card->portno;
1059         cmd->cmd.lcs_qipassist.version = 4;
1060         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1061         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1062                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1063         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1064         return lcs_send_lancmd(card, buffer, NULL);
1065 }
1066
1067 /**
1068  * check if multicast is supported by LCS
1069  */
1070 static void
1071 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1072 {
1073         LCS_DBF_TEXT(2, trace, "chkmccb");
1074         card->ip_assists_supported =
1075                 cmd->cmd.lcs_qipassist.ip_assists_supported;
1076         card->ip_assists_enabled =
1077                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1078 }
1079
1080 static int
1081 lcs_check_multicast_support(struct lcs_card *card)
1082 {
1083         struct lcs_buffer *buffer;
1084         struct lcs_cmd *cmd;
1085         int rc;
1086
1087         LCS_DBF_TEXT(2, trace, "cmdqipa");
1088         /* Send query ipassist. */
1089         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1090         cmd = (struct lcs_cmd *) buffer->data;
1091         cmd->cmd_code = LCS_CMD_QIPASSIST;
1092         cmd->initiator = LCS_INITIATOR_TCPIP;
1093         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1094         cmd->cmd.lcs_qipassist.portno = card->portno;
1095         cmd->cmd.lcs_qipassist.version = 4;
1096         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1097         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1098         if (rc != 0) {
1099                 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1100                 return -EOPNOTSUPP;
1101         }
1102         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1103                 return 0;
1104         return -EOPNOTSUPP;
1105 }
1106
1107 /**
1108  * set or del multicast address on LCS card
1109  */
1110 static void
1111 lcs_fix_multicast_list(struct lcs_card *card)
1112 {
1113         struct list_head failed_list;
1114         struct lcs_ipm_list *ipm, *tmp;
1115         unsigned long flags;
1116         int rc;
1117
1118         LCS_DBF_TEXT(4,trace, "fixipm");
1119         INIT_LIST_HEAD(&failed_list);
1120         spin_lock_irqsave(&card->ipm_lock, flags);
1121 list_modified:
1122         list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1123                 switch (ipm->ipm_state) {
1124                 case LCS_IPM_STATE_SET_REQUIRED:
1125                         /* del from ipm_list so noone else can tamper with
1126                          * this entry */
1127                         list_del_init(&ipm->list);
1128                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1129                         rc = lcs_send_setipm(card, ipm);
1130                         spin_lock_irqsave(&card->ipm_lock, flags);
1131                         if (rc) {
1132                                 pr_info("Adding multicast address failed."
1133                                         " Table possibly full!\n");
1134                                 /* store ipm in failed list -> will be added
1135                                  * to ipm_list again, so a retry will be done
1136                                  * during the next call of this function */
1137                                 list_add_tail(&ipm->list, &failed_list);
1138                         } else {
1139                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1140                                 /* re-insert into ipm_list */
1141                                 list_add_tail(&ipm->list, &card->ipm_list);
1142                         }
1143                         goto list_modified;
1144                 case LCS_IPM_STATE_DEL_REQUIRED:
1145                         list_del(&ipm->list);
1146                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1147                         lcs_send_delipm(card, ipm);
1148                         spin_lock_irqsave(&card->ipm_lock, flags);
1149                         kfree(ipm);
1150                         goto list_modified;
1151                 case LCS_IPM_STATE_ON_CARD:
1152                         break;
1153                 }
1154         }
1155         /* re-insert all entries from the failed_list into ipm_list */
1156         list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1157                 list_move_tail(&ipm->list, &card->ipm_list);
1158
1159         spin_unlock_irqrestore(&card->ipm_lock, flags);
1160 }
1161
1162 /**
1163  * get mac address for the relevant Multicast address
1164  */
1165 static void
1166 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1167 {
1168         LCS_DBF_TEXT(4,trace, "getmac");
1169         if (dev->type == ARPHRD_IEEE802_TR)
1170                 ip_tr_mc_map(ipm, mac);
1171         else
1172                 ip_eth_mc_map(ipm, mac);
1173 }
1174
1175 /**
1176  * function called by net device to handle multicast address relevant things
1177  */
1178 static inline void
1179 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1180 {
1181         struct ip_mc_list *im4;
1182         struct list_head *l;
1183         struct lcs_ipm_list *ipm;
1184         unsigned long flags;
1185         char buf[MAX_ADDR_LEN];
1186
1187         LCS_DBF_TEXT(4, trace, "remmclst");
1188         spin_lock_irqsave(&card->ipm_lock, flags);
1189         list_for_each(l, &card->ipm_list) {
1190                 ipm = list_entry(l, struct lcs_ipm_list, list);
1191                 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
1192                         lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1193                         if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1194                              (memcmp(buf, &ipm->ipm.mac_addr,
1195                                      LCS_MAC_LENGTH) == 0) )
1196                                 break;
1197                 }
1198                 if (im4 == NULL)
1199                         ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1200         }
1201         spin_unlock_irqrestore(&card->ipm_lock, flags);
1202 }
1203
1204 static inline struct lcs_ipm_list *
1205 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1206 {
1207         struct lcs_ipm_list *tmp, *ipm = NULL;
1208         struct list_head *l;
1209         unsigned long flags;
1210
1211         LCS_DBF_TEXT(4, trace, "chkmcent");
1212         spin_lock_irqsave(&card->ipm_lock, flags);
1213         list_for_each(l, &card->ipm_list) {
1214                 tmp = list_entry(l, struct lcs_ipm_list, list);
1215                 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1216                      (memcmp(buf, &tmp->ipm.mac_addr,
1217                              LCS_MAC_LENGTH) == 0) ) {
1218                         ipm = tmp;
1219                         break;
1220                 }
1221         }
1222         spin_unlock_irqrestore(&card->ipm_lock, flags);
1223         return ipm;
1224 }
1225
1226 static inline void
1227 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1228 {
1229
1230         struct ip_mc_list *im4;
1231         struct lcs_ipm_list *ipm;
1232         char buf[MAX_ADDR_LEN];
1233         unsigned long flags;
1234
1235         LCS_DBF_TEXT(4, trace, "setmclst");
1236         for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
1237                 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1238                 ipm = lcs_check_addr_entry(card, im4, buf);
1239                 if (ipm != NULL)
1240                         continue;       /* Address already in list. */
1241                 ipm = (struct lcs_ipm_list *)
1242                         kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1243                 if (ipm == NULL) {
1244                         pr_info("Not enough memory to add"
1245                                 " new multicast entry!\n");
1246                         break;
1247                 }
1248                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1249                 ipm->ipm.ip_addr = im4->multiaddr;
1250                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1251                 spin_lock_irqsave(&card->ipm_lock, flags);
1252                 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1253                 list_add(&ipm->list, &card->ipm_list);
1254                 spin_unlock_irqrestore(&card->ipm_lock, flags);
1255         }
1256 }
1257
1258 static int
1259 lcs_register_mc_addresses(void *data)
1260 {
1261         struct lcs_card *card;
1262         struct in_device *in4_dev;
1263
1264         card = (struct lcs_card *) data;
1265
1266         if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1267                 return 0;
1268         LCS_DBF_TEXT(4, trace, "regmulti");
1269
1270         in4_dev = in_dev_get(card->dev);
1271         if (in4_dev == NULL)
1272                 goto out;
1273         read_lock(&in4_dev->mc_list_lock);
1274         lcs_remove_mc_addresses(card,in4_dev);
1275         lcs_set_mc_addresses(card, in4_dev);
1276         read_unlock(&in4_dev->mc_list_lock);
1277         in_dev_put(in4_dev);
1278
1279         netif_carrier_off(card->dev);
1280         netif_tx_disable(card->dev);
1281         wait_event(card->write.wait_q,
1282                         (card->write.state != LCS_CH_STATE_RUNNING));
1283         lcs_fix_multicast_list(card);
1284         if (card->state == DEV_STATE_UP) {
1285                 netif_carrier_on(card->dev);
1286                 netif_wake_queue(card->dev);
1287         }
1288 out:
1289         lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1290         return 0;
1291 }
1292 #endif /* CONFIG_IP_MULTICAST */
1293
1294 /**
1295  * function called by net device to
1296  * handle multicast address relevant things
1297  */
1298 static void
1299 lcs_set_multicast_list(struct net_device *dev)
1300 {
1301 #ifdef CONFIG_IP_MULTICAST
1302         struct lcs_card *card;
1303
1304         LCS_DBF_TEXT(4, trace, "setmulti");
1305         card = (struct lcs_card *) dev->ml_priv;
1306
1307         if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1308                 schedule_work(&card->kernel_thread_starter);
1309 #endif /* CONFIG_IP_MULTICAST */
1310 }
1311
1312 static long
1313 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1314 {
1315         if (!IS_ERR(irb))
1316                 return 0;
1317
1318         switch (PTR_ERR(irb)) {
1319         case -EIO:
1320                 dev_warn(&cdev->dev,
1321                         "An I/O-error occurred on the LCS device\n");
1322                 LCS_DBF_TEXT(2, trace, "ckirberr");
1323                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1324                 break;
1325         case -ETIMEDOUT:
1326                 dev_warn(&cdev->dev,
1327                         "A command timed out on the LCS device\n");
1328                 LCS_DBF_TEXT(2, trace, "ckirberr");
1329                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1330                 break;
1331         default:
1332                 dev_warn(&cdev->dev,
1333                         "An error occurred on the LCS device, rc=%ld\n",
1334                         PTR_ERR(irb));
1335                 LCS_DBF_TEXT(2, trace, "ckirberr");
1336                 LCS_DBF_TEXT(2, trace, "  rc???");
1337         }
1338         return PTR_ERR(irb);
1339 }
1340
1341 static int
1342 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1343 {
1344         int dstat, cstat;
1345         char *sense;
1346
1347         sense = (char *) irb->ecw;
1348         cstat = irb->scsw.cmd.cstat;
1349         dstat = irb->scsw.cmd.dstat;
1350
1351         if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1352                      SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1353                      SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
1354                 LCS_DBF_TEXT(2, trace, "CGENCHK");
1355                 return 1;
1356         }
1357         if (dstat & DEV_STAT_UNIT_CHECK) {
1358                 if (sense[LCS_SENSE_BYTE_1] &
1359                     LCS_SENSE_RESETTING_EVENT) {
1360                         LCS_DBF_TEXT(2, trace, "REVIND");
1361                         return 1;
1362                 }
1363                 if (sense[LCS_SENSE_BYTE_0] &
1364                     LCS_SENSE_CMD_REJECT) {
1365                         LCS_DBF_TEXT(2, trace, "CMDREJ");
1366                         return 0;
1367                 }
1368                 if ((!sense[LCS_SENSE_BYTE_0]) &&
1369                     (!sense[LCS_SENSE_BYTE_1]) &&
1370                     (!sense[LCS_SENSE_BYTE_2]) &&
1371                     (!sense[LCS_SENSE_BYTE_3])) {
1372                         LCS_DBF_TEXT(2, trace, "ZEROSEN");
1373                         return 0;
1374                 }
1375                 LCS_DBF_TEXT(2, trace, "DGENCHK");
1376                 return 1;
1377         }
1378         return 0;
1379 }
1380
1381 static void
1382 lcs_schedule_recovery(struct lcs_card *card)
1383 {
1384         LCS_DBF_TEXT(2, trace, "startrec");
1385         if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1386                 schedule_work(&card->kernel_thread_starter);
1387 }
1388
1389 /**
1390  * IRQ Handler for LCS channels
1391  */
1392 static void
1393 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1394 {
1395         struct lcs_card *card;
1396         struct lcs_channel *channel;
1397         int rc, index;
1398         int cstat, dstat;
1399
1400         if (lcs_check_irb_error(cdev, irb))
1401                 return;
1402
1403         card = CARD_FROM_DEV(cdev);
1404         if (card->read.ccwdev == cdev)
1405                 channel = &card->read;
1406         else
1407                 channel = &card->write;
1408
1409         cstat = irb->scsw.cmd.cstat;
1410         dstat = irb->scsw.cmd.dstat;
1411         LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1412         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1413                       irb->scsw.cmd.dstat);
1414         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1415                       irb->scsw.cmd.actl);
1416
1417         /* Check for channel and device errors presented */
1418         rc = lcs_get_problem(cdev, irb);
1419         if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1420                 dev_warn(&cdev->dev,
1421                         "The LCS device stopped because of an error,"
1422                         " dstat=0x%X, cstat=0x%X \n",
1423                             dstat, cstat);
1424                 if (rc) {
1425                         channel->state = LCS_CH_STATE_ERROR;
1426                 }
1427         }
1428         if (channel->state == LCS_CH_STATE_ERROR) {
1429                 lcs_schedule_recovery(card);
1430                 wake_up(&card->wait_q);
1431                 return;
1432         }
1433         /* How far in the ccw chain have we processed? */
1434         if ((channel->state != LCS_CH_STATE_INIT) &&
1435             (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1436             (irb->scsw.cmd.cpa != 0)) {
1437                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1438                         - channel->ccws;
1439                 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1440                     (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1441                         /* Bloody io subsystem tells us lies about cpa... */
1442                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1443                 while (channel->io_idx != index) {
1444                         __lcs_processed_buffer(channel,
1445                                                channel->iob + channel->io_idx);
1446                         channel->io_idx =
1447                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1448                 }
1449         }
1450
1451         if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1452             (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1453             (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1454                 /* Mark channel as stopped. */
1455                 channel->state = LCS_CH_STATE_STOPPED;
1456         else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1457                 /* CCW execution stopped on a suspend bit. */
1458                 channel->state = LCS_CH_STATE_SUSPENDED;
1459         if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1460                 if (irb->scsw.cmd.cc != 0) {
1461                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1462                         return;
1463                 }
1464                 /* The channel has been stopped by halt_IO. */
1465                 channel->state = LCS_CH_STATE_HALTED;
1466         }
1467         if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1468                 channel->state = LCS_CH_STATE_CLEARED;
1469         /* Do the rest in the tasklet. */
1470         tasklet_schedule(&channel->irq_tasklet);
1471 }
1472
1473 /**
1474  * Tasklet for IRQ handler
1475  */
1476 static void
1477 lcs_tasklet(unsigned long data)
1478 {
1479         unsigned long flags;
1480         struct lcs_channel *channel;
1481         struct lcs_buffer *iob;
1482         int buf_idx;
1483         int rc;
1484
1485         channel = (struct lcs_channel *) data;
1486         LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1487
1488         /* Check for processed buffers. */
1489         iob = channel->iob;
1490         buf_idx = channel->buf_idx;
1491         while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1492                 /* Do the callback thing. */
1493                 if (iob[buf_idx].callback != NULL)
1494                         iob[buf_idx].callback(channel, iob + buf_idx);
1495                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1496         }
1497         channel->buf_idx = buf_idx;
1498
1499         if (channel->state == LCS_CH_STATE_STOPPED)
1500                 // FIXME: what if rc != 0 ??
1501                 rc = lcs_start_channel(channel);
1502         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1503         if (channel->state == LCS_CH_STATE_SUSPENDED &&
1504             channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) {
1505                 // FIXME: what if rc != 0 ??
1506                 rc = __lcs_resume_channel(channel);
1507         }
1508         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1509
1510         /* Something happened on the channel. Wake up waiters. */
1511         wake_up(&channel->wait_q);
1512 }
1513
1514 /**
1515  * Finish current tx buffer and make it ready for transmit.
1516  */
1517 static void
1518 __lcs_emit_txbuffer(struct lcs_card *card)
1519 {
1520         LCS_DBF_TEXT(5, trace, "emittx");
1521         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1522         card->tx_buffer->count += 2;
1523         lcs_ready_buffer(&card->write, card->tx_buffer);
1524         card->tx_buffer = NULL;
1525         card->tx_emitted++;
1526 }
1527
1528 /**
1529  * Callback for finished tx buffers.
1530  */
1531 static void
1532 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1533 {
1534         struct lcs_card *card;
1535
1536         LCS_DBF_TEXT(5, trace, "txbuffcb");
1537         /* Put buffer back to pool. */
1538         lcs_release_buffer(channel, buffer);
1539         card = container_of(channel, struct lcs_card, write);
1540         if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1541                 netif_wake_queue(card->dev);
1542         spin_lock(&card->lock);
1543         card->tx_emitted--;
1544         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1545                 /*
1546                  * Last running tx buffer has finished. Submit partially
1547                  * filled current buffer.
1548                  */
1549                 __lcs_emit_txbuffer(card);
1550         spin_unlock(&card->lock);
1551 }
1552
1553 /**
1554  * Packet transmit function called by network stack
1555  */
1556 static int
1557 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1558                  struct net_device *dev)
1559 {
1560         struct lcs_header *header;
1561         int rc = NETDEV_TX_OK;
1562
1563         LCS_DBF_TEXT(5, trace, "hardxmit");
1564         if (skb == NULL) {
1565                 card->stats.tx_dropped++;
1566                 card->stats.tx_errors++;
1567                 return NETDEV_TX_OK;
1568         }
1569         if (card->state != DEV_STATE_UP) {
1570                 dev_kfree_skb(skb);
1571                 card->stats.tx_dropped++;
1572                 card->stats.tx_errors++;
1573                 card->stats.tx_carrier_errors++;
1574                 return NETDEV_TX_OK;
1575         }
1576         if (skb->protocol == htons(ETH_P_IPV6)) {
1577                 dev_kfree_skb(skb);
1578                 return NETDEV_TX_OK;
1579         }
1580         netif_stop_queue(card->dev);
1581         spin_lock(&card->lock);
1582         if (card->tx_buffer != NULL &&
1583             card->tx_buffer->count + sizeof(struct lcs_header) +
1584             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1585                 /* skb too big for current tx buffer. */
1586                 __lcs_emit_txbuffer(card);
1587         if (card->tx_buffer == NULL) {
1588                 /* Get new tx buffer */
1589                 card->tx_buffer = lcs_get_buffer(&card->write);
1590                 if (card->tx_buffer == NULL) {
1591                         card->stats.tx_dropped++;
1592                         rc = NETDEV_TX_BUSY;
1593                         goto out;
1594                 }
1595                 card->tx_buffer->callback = lcs_txbuffer_cb;
1596                 card->tx_buffer->count = 0;
1597         }
1598         header = (struct lcs_header *)
1599                 (card->tx_buffer->data + card->tx_buffer->count);
1600         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1601         header->offset = card->tx_buffer->count;
1602         header->type = card->lan_type;
1603         header->slot = card->portno;
1604         skb_copy_from_linear_data(skb, header + 1, skb->len);
1605         spin_unlock(&card->lock);
1606         card->stats.tx_bytes += skb->len;
1607         card->stats.tx_packets++;
1608         dev_kfree_skb(skb);
1609         netif_wake_queue(card->dev);
1610         spin_lock(&card->lock);
1611         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1612                 /* If this is the first tx buffer emit it immediately. */
1613                 __lcs_emit_txbuffer(card);
1614 out:
1615         spin_unlock(&card->lock);
1616         return rc;
1617 }
1618
1619 static int
1620 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1621 {
1622         struct lcs_card *card;
1623         int rc;
1624
1625         LCS_DBF_TEXT(5, trace, "pktxmit");
1626         card = (struct lcs_card *) dev->ml_priv;
1627         rc = __lcs_start_xmit(card, skb, dev);
1628         return rc;
1629 }
1630
1631 /**
1632  * send startlan and lanstat command to make LCS device ready
1633  */
1634 static int
1635 lcs_startlan_auto(struct lcs_card *card)
1636 {
1637         int rc;
1638
1639         LCS_DBF_TEXT(2, trace, "strtauto");
1640 #ifdef CONFIG_NET_ETHERNET
1641         card->lan_type = LCS_FRAME_TYPE_ENET;
1642         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1643         if (rc == 0)
1644                 return 0;
1645
1646 #endif
1647 #ifdef CONFIG_TR
1648         card->lan_type = LCS_FRAME_TYPE_TR;
1649         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1650         if (rc == 0)
1651                 return 0;
1652 #endif
1653 #ifdef CONFIG_FDDI
1654         card->lan_type = LCS_FRAME_TYPE_FDDI;
1655         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1656         if (rc == 0)
1657                 return 0;
1658 #endif
1659         return -EIO;
1660 }
1661
1662 static int
1663 lcs_startlan(struct lcs_card *card)
1664 {
1665         int rc, i;
1666
1667         LCS_DBF_TEXT(2, trace, "startlan");
1668         rc = 0;
1669         if (card->portno != LCS_INVALID_PORT_NO) {
1670                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1671                         rc = lcs_startlan_auto(card);
1672                 else
1673                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1674         } else {
1675                 for (i = 0; i <= 16; i++) {
1676                         card->portno = i;
1677                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1678                                 rc = lcs_send_startlan(card,
1679                                                        LCS_INITIATOR_TCPIP);
1680                         else
1681                                 /* autodetecting lan type */
1682                                 rc = lcs_startlan_auto(card);
1683                         if (rc == 0)
1684                                 break;
1685                 }
1686         }
1687         if (rc == 0)
1688                 return lcs_send_lanstat(card);
1689         return rc;
1690 }
1691
1692 /**
1693  * LCS detect function
1694  * setup channels and make them I/O ready
1695  */
1696 static int
1697 lcs_detect(struct lcs_card *card)
1698 {
1699         int rc = 0;
1700
1701         LCS_DBF_TEXT(2, setup, "lcsdetct");
1702         /* start/reset card */
1703         if (card->dev)
1704                 netif_stop_queue(card->dev);
1705         rc = lcs_stop_channels(card);
1706         if (rc == 0) {
1707                 rc = lcs_start_channels(card);
1708                 if (rc == 0) {
1709                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1710                         if (rc == 0)
1711                                 rc = lcs_startlan(card);
1712                 }
1713         }
1714         if (rc == 0) {
1715                 card->state = DEV_STATE_UP;
1716         } else {
1717                 card->state = DEV_STATE_DOWN;
1718                 card->write.state = LCS_CH_STATE_INIT;
1719                 card->read.state =  LCS_CH_STATE_INIT;
1720         }
1721         return rc;
1722 }
1723
1724 /**
1725  * LCS Stop card
1726  */
1727 static int
1728 lcs_stopcard(struct lcs_card *card)
1729 {
1730         int rc;
1731
1732         LCS_DBF_TEXT(3, setup, "stopcard");
1733
1734         if (card->read.state != LCS_CH_STATE_STOPPED &&
1735             card->write.state != LCS_CH_STATE_STOPPED &&
1736             card->read.state != LCS_CH_STATE_ERROR &&
1737             card->write.state != LCS_CH_STATE_ERROR &&
1738             card->state == DEV_STATE_UP) {
1739                 lcs_clear_multicast_list(card);
1740                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1741                 rc = lcs_send_shutdown(card);
1742         }
1743         rc = lcs_stop_channels(card);
1744         card->state = DEV_STATE_DOWN;
1745
1746         return rc;
1747 }
1748
1749 /**
1750  * Kernel Thread helper functions for LGW initiated commands
1751  */
1752 static void
1753 lcs_start_kernel_thread(struct work_struct *work)
1754 {
1755         struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1756         LCS_DBF_TEXT(5, trace, "krnthrd");
1757         if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1758                 kthread_run(lcs_recovery, card, "lcs_recover");
1759 #ifdef CONFIG_IP_MULTICAST
1760         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1761                 kthread_run(lcs_register_mc_addresses, card, "regipm");
1762 #endif
1763 }
1764
1765 /**
1766  * Process control frames.
1767  */
1768 static void
1769 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1770 {
1771         LCS_DBF_TEXT(5, trace, "getctrl");
1772         if (cmd->initiator == LCS_INITIATOR_LGW) {
1773                 switch(cmd->cmd_code) {
1774                 case LCS_CMD_STARTUP:
1775                 case LCS_CMD_STARTLAN:
1776                         lcs_schedule_recovery(card);
1777                         break;
1778                 case LCS_CMD_STOPLAN:
1779                         pr_warning("Stoplan for %s initiated by LGW.\n",
1780                                    card->dev->name);
1781                         if (card->dev)
1782                                 netif_carrier_off(card->dev);
1783                         break;
1784                 default:
1785                         LCS_DBF_TEXT(5, trace, "noLGWcmd");
1786                         break;
1787                 }
1788         } else
1789                 lcs_notify_lancmd_waiters(card, cmd);
1790 }
1791
1792 /**
1793  * Unpack network packet.
1794  */
1795 static void
1796 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1797 {
1798         struct sk_buff *skb;
1799
1800         LCS_DBF_TEXT(5, trace, "getskb");
1801         if (card->dev == NULL ||
1802             card->state != DEV_STATE_UP)
1803                 /* The card isn't up. Ignore the packet. */
1804                 return;
1805
1806         skb = dev_alloc_skb(skb_len);
1807         if (skb == NULL) {
1808                 dev_err(&card->dev->dev,
1809                         " Allocating a socket buffer to interface %s failed\n",
1810                           card->dev->name);
1811                 card->stats.rx_dropped++;
1812                 return;
1813         }
1814         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1815         skb->protocol = card->lan_type_trans(skb, card->dev);
1816         card->stats.rx_bytes += skb_len;
1817         card->stats.rx_packets++;
1818         if (skb->protocol == htons(ETH_P_802_2))
1819                 *((__u32 *)skb->cb) = ++card->pkt_seq;
1820         netif_rx(skb);
1821 }
1822
1823 /**
1824  * LCS main routine to get packets and lancmd replies from the buffers
1825  */
1826 static void
1827 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1828 {
1829         struct lcs_card *card;
1830         struct lcs_header *lcs_hdr;
1831         __u16 offset;
1832
1833         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1834         lcs_hdr = (struct lcs_header *) buffer->data;
1835         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1836                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1837                 return;
1838         }
1839         card = container_of(channel, struct lcs_card, read);
1840         offset = 0;
1841         while (lcs_hdr->offset != 0) {
1842                 if (lcs_hdr->offset <= 0 ||
1843                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1844                     lcs_hdr->offset < offset) {
1845                         /* Offset invalid. */
1846                         card->stats.rx_length_errors++;
1847                         card->stats.rx_errors++;
1848                         return;
1849                 }
1850                 /* What kind of frame is it? */
1851                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1852                         /* Control frame. */
1853                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1854                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1855                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1856                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1857                         /* Normal network packet. */
1858                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1859                                     lcs_hdr->offset - offset -
1860                                     sizeof(struct lcs_header));
1861                 else
1862                         /* Unknown frame type. */
1863                         ; // FIXME: error message ?
1864                 /* Proceed to next frame. */
1865                 offset = lcs_hdr->offset;
1866                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1867                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1868         }
1869         /* The buffer is now empty. Make it ready again. */
1870         lcs_ready_buffer(&card->read, buffer);
1871 }
1872
1873 /**
1874  * get network statistics for ifconfig and other user programs
1875  */
1876 static struct net_device_stats *
1877 lcs_getstats(struct net_device *dev)
1878 {
1879         struct lcs_card *card;
1880
1881         LCS_DBF_TEXT(4, trace, "netstats");
1882         card = (struct lcs_card *) dev->ml_priv;
1883         return &card->stats;
1884 }
1885
1886 /**
1887  * stop lcs device
1888  * This function will be called by user doing ifconfig xxx down
1889  */
1890 static int
1891 lcs_stop_device(struct net_device *dev)
1892 {
1893         struct lcs_card *card;
1894         int rc;
1895
1896         LCS_DBF_TEXT(2, trace, "stopdev");
1897         card   = (struct lcs_card *) dev->ml_priv;
1898         netif_carrier_off(dev);
1899         netif_tx_disable(dev);
1900         dev->flags &= ~IFF_UP;
1901         wait_event(card->write.wait_q,
1902                 (card->write.state != LCS_CH_STATE_RUNNING));
1903         rc = lcs_stopcard(card);
1904         if (rc)
1905                 dev_err(&card->dev->dev,
1906                         " Shutting down the LCS device failed\n ");
1907         return rc;
1908 }
1909
1910 /**
1911  * start lcs device and make it runnable
1912  * This function will be called by user doing ifconfig xxx up
1913  */
1914 static int
1915 lcs_open_device(struct net_device *dev)
1916 {
1917         struct lcs_card *card;
1918         int rc;
1919
1920         LCS_DBF_TEXT(2, trace, "opendev");
1921         card = (struct lcs_card *) dev->ml_priv;
1922         /* initialize statistics */
1923         rc = lcs_detect(card);
1924         if (rc) {
1925                 pr_err("Error in opening device!\n");
1926
1927         } else {
1928                 dev->flags |= IFF_UP;
1929                 netif_carrier_on(dev);
1930                 netif_wake_queue(dev);
1931                 card->state = DEV_STATE_UP;
1932         }
1933         return rc;
1934 }
1935
1936 /**
1937  * show function for portno called by cat or similar things
1938  */
1939 static ssize_t
1940 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1941 {
1942         struct lcs_card *card;
1943
1944         card = dev_get_drvdata(dev);
1945
1946         if (!card)
1947                 return 0;
1948
1949         return sprintf(buf, "%d\n", card->portno);
1950 }
1951
1952 /**
1953  * store the value which is piped to file portno
1954  */
1955 static ssize_t
1956 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1957 {
1958         struct lcs_card *card;
1959         int value;
1960
1961         card = dev_get_drvdata(dev);
1962
1963         if (!card)
1964                 return 0;
1965
1966         sscanf(buf, "%u", &value);
1967         /* TODO: sanity checks */
1968         card->portno = value;
1969
1970         return count;
1971
1972 }
1973
1974 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1975
1976 const char *lcs_type[] = {
1977         "not a channel",
1978         "2216 parallel",
1979         "2216 channel",
1980         "OSA LCS card",
1981         "unknown channel type",
1982         "unsupported channel type",
1983 };
1984
1985 static ssize_t
1986 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1987 {
1988         struct ccwgroup_device *cgdev;
1989
1990         cgdev = to_ccwgroupdev(dev);
1991         if (!cgdev)
1992                 return -ENODEV;
1993
1994         return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1995 }
1996
1997 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1998
1999 static ssize_t
2000 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
2001 {
2002         struct lcs_card *card;
2003
2004         card = dev_get_drvdata(dev);
2005
2006         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
2007 }
2008
2009 static ssize_t
2010 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
2011 {
2012         struct lcs_card *card;
2013         int value;
2014
2015         card = dev_get_drvdata(dev);
2016
2017         if (!card)
2018                 return 0;
2019
2020         sscanf(buf, "%u", &value);
2021         /* TODO: sanity checks */
2022         card->lancmd_timeout = value;
2023
2024         return count;
2025
2026 }
2027
2028 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2029
2030 static ssize_t
2031 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2032                       const char *buf, size_t count)
2033 {
2034         struct lcs_card *card = dev_get_drvdata(dev);
2035         char *tmp;
2036         int i;
2037
2038         if (!card)
2039                 return -EINVAL;
2040         if (card->state != DEV_STATE_UP)
2041                 return -EPERM;
2042         i = simple_strtoul(buf, &tmp, 16);
2043         if (i == 1)
2044                 lcs_schedule_recovery(card);
2045         return count;
2046 }
2047
2048 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2049
2050 static struct attribute * lcs_attrs[] = {
2051         &dev_attr_portno.attr,
2052         &dev_attr_type.attr,
2053         &dev_attr_lancmd_timeout.attr,
2054         &dev_attr_recover.attr,
2055         NULL,
2056 };
2057
2058 static struct attribute_group lcs_attr_group = {
2059         .attrs = lcs_attrs,
2060 };
2061
2062 /**
2063  * lcs_probe_device is called on establishing a new ccwgroup_device.
2064  */
2065 static int
2066 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2067 {
2068         struct lcs_card *card;
2069         int ret;
2070
2071         if (!get_device(&ccwgdev->dev))
2072                 return -ENODEV;
2073
2074         LCS_DBF_TEXT(2, setup, "add_dev");
2075         card = lcs_alloc_card();
2076         if (!card) {
2077                 LCS_DBF_TEXT_(2, setup, "  rc%d", -ENOMEM);
2078                 put_device(&ccwgdev->dev);
2079                 return -ENOMEM;
2080         }
2081         ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2082         if (ret) {
2083                 lcs_free_card(card);
2084                 put_device(&ccwgdev->dev);
2085                 return ret;
2086         }
2087         dev_set_drvdata(&ccwgdev->dev, card);
2088         ccwgdev->cdev[0]->handler = lcs_irq;
2089         ccwgdev->cdev[1]->handler = lcs_irq;
2090         card->gdev = ccwgdev;
2091         INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2092         card->thread_start_mask = 0;
2093         card->thread_allowed_mask = 0;
2094         card->thread_running_mask = 0;
2095         return 0;
2096 }
2097
2098 static int
2099 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2100 {
2101         struct lcs_card *card;
2102
2103         LCS_DBF_TEXT(2, setup, "regnetdv");
2104         card = dev_get_drvdata(&ccwgdev->dev);
2105         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2106                 return 0;
2107         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2108         return register_netdev(card->dev);
2109 }
2110
2111 /**
2112  * lcs_new_device will be called by setting the group device online.
2113  */
2114 static const struct net_device_ops lcs_netdev_ops = {
2115         .ndo_open               = lcs_open_device,
2116         .ndo_stop               = lcs_stop_device,
2117         .ndo_get_stats          = lcs_getstats,
2118         .ndo_start_xmit         = lcs_start_xmit,
2119 };
2120
2121 static const struct net_device_ops lcs_mc_netdev_ops = {
2122         .ndo_open               = lcs_open_device,
2123         .ndo_stop               = lcs_stop_device,
2124         .ndo_get_stats          = lcs_getstats,
2125         .ndo_start_xmit         = lcs_start_xmit,
2126         .ndo_set_multicast_list = lcs_set_multicast_list,
2127 };
2128
2129 static int
2130 lcs_new_device(struct ccwgroup_device *ccwgdev)
2131 {
2132         struct  lcs_card *card;
2133         struct net_device *dev=NULL;
2134         enum lcs_dev_states recover_state;
2135         int rc;
2136
2137         card = dev_get_drvdata(&ccwgdev->dev);
2138         if (!card)
2139                 return -ENODEV;
2140
2141         LCS_DBF_TEXT(2, setup, "newdev");
2142         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2143         card->read.ccwdev  = ccwgdev->cdev[0];
2144         card->write.ccwdev = ccwgdev->cdev[1];
2145
2146         recover_state = card->state;
2147         rc = ccw_device_set_online(card->read.ccwdev);
2148         if (rc)
2149                 goto out_err;
2150         rc = ccw_device_set_online(card->write.ccwdev);
2151         if (rc)
2152                 goto out_werr;
2153
2154         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2155
2156         lcs_setup_card(card);
2157         rc = lcs_detect(card);
2158         if (rc) {
2159                 LCS_DBF_TEXT(2, setup, "dtctfail");
2160                 dev_err(&card->dev->dev,
2161                         "Detecting a network adapter for LCS devices"
2162                         " failed with rc=%d (0x%x)\n", rc, rc);
2163                 lcs_stopcard(card);
2164                 goto out;
2165         }
2166         if (card->dev) {
2167                 LCS_DBF_TEXT(2, setup, "samedev");
2168                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2169                 goto netdev_out;
2170         }
2171         switch (card->lan_type) {
2172 #ifdef CONFIG_NET_ETHERNET
2173         case LCS_FRAME_TYPE_ENET:
2174                 card->lan_type_trans = eth_type_trans;
2175                 dev = alloc_etherdev(0);
2176                 break;
2177 #endif
2178 #ifdef CONFIG_TR
2179         case LCS_FRAME_TYPE_TR:
2180                 card->lan_type_trans = tr_type_trans;
2181                 dev = alloc_trdev(0);
2182                 break;
2183 #endif
2184 #ifdef CONFIG_FDDI
2185         case LCS_FRAME_TYPE_FDDI:
2186                 card->lan_type_trans = fddi_type_trans;
2187                 dev = alloc_fddidev(0);
2188                 break;
2189 #endif
2190         default:
2191                 LCS_DBF_TEXT(3, setup, "errinit");
2192                 pr_err(" Initialization failed\n");
2193                 goto out;
2194         }
2195         if (!dev)
2196                 goto out;
2197         card->dev = dev;
2198         card->dev->ml_priv = card;
2199         card->dev->netdev_ops = &lcs_netdev_ops;
2200         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2201 #ifdef CONFIG_IP_MULTICAST
2202         if (!lcs_check_multicast_support(card))
2203                 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2204 #endif
2205 netdev_out:
2206         lcs_set_allowed_threads(card,0xffffffff);
2207         if (recover_state == DEV_STATE_RECOVER) {
2208                 lcs_set_multicast_list(card->dev);
2209                 card->dev->flags |= IFF_UP;
2210                 netif_carrier_on(card->dev);
2211                 netif_wake_queue(card->dev);
2212                 card->state = DEV_STATE_UP;
2213         } else {
2214                 lcs_stopcard(card);
2215         }
2216
2217         if (lcs_register_netdev(ccwgdev) != 0)
2218                 goto out;
2219
2220         /* Print out supported assists: IPv6 */
2221         pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2222                 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2223                 "with" : "without");
2224         /* Print out supported assist: Multicast */
2225         pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2226                 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2227                 "with" : "without");
2228         return 0;
2229 out:
2230
2231         ccw_device_set_offline(card->write.ccwdev);
2232 out_werr:
2233         ccw_device_set_offline(card->read.ccwdev);
2234 out_err:
2235         return -ENODEV;
2236 }
2237
2238 /**
2239  * lcs_shutdown_device, called when setting the group device offline.
2240  */
2241 static int
2242 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2243 {
2244         struct lcs_card *card;
2245         enum lcs_dev_states recover_state;
2246         int ret;
2247
2248         LCS_DBF_TEXT(3, setup, "shtdndev");
2249         card = dev_get_drvdata(&ccwgdev->dev);
2250         if (!card)
2251                 return -ENODEV;
2252         if (recovery_mode == 0) {
2253                 lcs_set_allowed_threads(card, 0);
2254                 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2255                         return -ERESTARTSYS;
2256         }
2257         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2258         recover_state = card->state;
2259
2260         ret = lcs_stop_device(card->dev);
2261         ret = ccw_device_set_offline(card->read.ccwdev);
2262         ret = ccw_device_set_offline(card->write.ccwdev);
2263         if (recover_state == DEV_STATE_UP) {
2264                 card->state = DEV_STATE_RECOVER;
2265         }
2266         if (ret)
2267                 return ret;
2268         return 0;
2269 }
2270
2271 static int
2272 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2273 {
2274         return __lcs_shutdown_device(ccwgdev, 0);
2275 }
2276
2277 /**
2278  * drive lcs recovery after startup and startlan initiated by Lan Gateway
2279  */
2280 static int
2281 lcs_recovery(void *ptr)
2282 {
2283         struct lcs_card *card;
2284         struct ccwgroup_device *gdev;
2285         int rc;
2286
2287         card = (struct lcs_card *) ptr;
2288
2289         LCS_DBF_TEXT(4, trace, "recover1");
2290         if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2291                 return 0;
2292         LCS_DBF_TEXT(4, trace, "recover2");
2293         gdev = card->gdev;
2294         dev_warn(&gdev->dev,
2295                 "A recovery process has been started for the LCS device\n");
2296         rc = __lcs_shutdown_device(gdev, 1);
2297         rc = lcs_new_device(gdev);
2298         if (!rc)
2299                 pr_info("Device %s successfully recovered!\n",
2300                         card->dev->name);
2301         else
2302                 pr_info("Device %s could not be recovered!\n",
2303                         card->dev->name);
2304         lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2305         return 0;
2306 }
2307
2308 /**
2309  * lcs_remove_device, free buffers and card
2310  */
2311 static void
2312 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2313 {
2314         struct lcs_card *card;
2315
2316         card = dev_get_drvdata(&ccwgdev->dev);
2317         if (!card)
2318                 return;
2319
2320         LCS_DBF_TEXT(3, setup, "remdev");
2321         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2322         if (ccwgdev->state == CCWGROUP_ONLINE) {
2323                 lcs_shutdown_device(ccwgdev);
2324         }
2325         if (card->dev)
2326                 unregister_netdev(card->dev);
2327         sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2328         lcs_cleanup_card(card);
2329         lcs_free_card(card);
2330         put_device(&ccwgdev->dev);
2331 }
2332
2333 static int lcs_pm_suspend(struct lcs_card *card)
2334 {
2335         if (card->dev)
2336                 netif_device_detach(card->dev);
2337         lcs_set_allowed_threads(card, 0);
2338         lcs_wait_for_threads(card, 0xffffffff);
2339         if (card->state != DEV_STATE_DOWN)
2340                 __lcs_shutdown_device(card->gdev, 1);
2341         return 0;
2342 }
2343
2344 static int lcs_pm_resume(struct lcs_card *card)
2345 {
2346         int rc = 0;
2347
2348         if (card->state == DEV_STATE_RECOVER)
2349                 rc = lcs_new_device(card->gdev);
2350         if (card->dev)
2351                 netif_device_attach(card->dev);
2352         if (rc) {
2353                 dev_warn(&card->gdev->dev, "The lcs device driver "
2354                         "failed to recover the device\n");
2355         }
2356         return rc;
2357 }
2358
2359 static int lcs_prepare(struct ccwgroup_device *gdev)
2360 {
2361         return 0;
2362 }
2363
2364 static void lcs_complete(struct ccwgroup_device *gdev)
2365 {
2366         return;
2367 }
2368
2369 static int lcs_freeze(struct ccwgroup_device *gdev)
2370 {
2371         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2372         return lcs_pm_suspend(card);
2373 }
2374
2375 static int lcs_thaw(struct ccwgroup_device *gdev)
2376 {
2377         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2378         return lcs_pm_resume(card);
2379 }
2380
2381 static int lcs_restore(struct ccwgroup_device *gdev)
2382 {
2383         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2384         return lcs_pm_resume(card);
2385 }
2386
2387 static struct ccw_device_id lcs_ids[] = {
2388         {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2389         {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2390         {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2391         {},
2392 };
2393 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2394
2395 static struct ccw_driver lcs_ccw_driver = {
2396         .owner  = THIS_MODULE,
2397         .name   = "lcs",
2398         .ids    = lcs_ids,
2399         .probe  = ccwgroup_probe_ccwdev,
2400         .remove = ccwgroup_remove_ccwdev,
2401 };
2402
2403 /**
2404  * LCS ccwgroup driver registration
2405  */
2406 static struct ccwgroup_driver lcs_group_driver = {
2407         .owner       = THIS_MODULE,
2408         .name        = "lcs",
2409         .max_slaves  = 2,
2410         .driver_id   = 0xD3C3E2,
2411         .probe       = lcs_probe_device,
2412         .remove      = lcs_remove_device,
2413         .set_online  = lcs_new_device,
2414         .set_offline = lcs_shutdown_device,
2415         .prepare     = lcs_prepare,
2416         .complete    = lcs_complete,
2417         .freeze      = lcs_freeze,
2418         .thaw        = lcs_thaw,
2419         .restore     = lcs_restore,
2420 };
2421
2422 static ssize_t
2423 lcs_driver_group_store(struct device_driver *ddrv, const char *buf,
2424                        size_t count)
2425 {
2426         int err;
2427         err = ccwgroup_create_from_string(lcs_root_dev,
2428                                           lcs_group_driver.driver_id,
2429                                           &lcs_ccw_driver, 2, buf);
2430         return err ? err : count;
2431 }
2432
2433 static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2434
2435 static struct attribute *lcs_group_attrs[] = {
2436         &driver_attr_group.attr,
2437         NULL,
2438 };
2439
2440 static struct attribute_group lcs_group_attr_group = {
2441         .attrs = lcs_group_attrs,
2442 };
2443
2444 static const struct attribute_group *lcs_group_attr_groups[] = {
2445         &lcs_group_attr_group,
2446         NULL,
2447 };
2448
2449 /**
2450  *  LCS Module/Kernel initialization function
2451  */
2452 static int
2453 __init lcs_init_module(void)
2454 {
2455         int rc;
2456
2457         pr_info("Loading %s\n", version);
2458         rc = lcs_register_debug_facility();
2459         LCS_DBF_TEXT(0, setup, "lcsinit");
2460         if (rc)
2461                 goto out_err;
2462         lcs_root_dev = root_device_register("lcs");
2463         rc = IS_ERR(lcs_root_dev) ? PTR_ERR(lcs_root_dev) : 0;
2464         if (rc)
2465                 goto register_err;
2466         rc = ccw_driver_register(&lcs_ccw_driver);
2467         if (rc)
2468                 goto ccw_err;
2469         lcs_group_driver.driver.groups = lcs_group_attr_groups;
2470         rc = ccwgroup_driver_register(&lcs_group_driver);
2471         if (rc)
2472                 goto ccwgroup_err;
2473         return 0;
2474
2475 ccwgroup_err:
2476         ccw_driver_unregister(&lcs_ccw_driver);
2477 ccw_err:
2478         root_device_unregister(lcs_root_dev);
2479 register_err:
2480         lcs_unregister_debug_facility();
2481 out_err:
2482         pr_err("Initializing the lcs device driver failed\n");
2483         return rc;
2484 }
2485
2486
2487 /**
2488  *  LCS module cleanup function
2489  */
2490 static void
2491 __exit lcs_cleanup_module(void)
2492 {
2493         pr_info("Terminating lcs module.\n");
2494         LCS_DBF_TEXT(0, trace, "cleanup");
2495         driver_remove_file(&lcs_group_driver.driver,
2496                            &driver_attr_group);
2497         ccwgroup_driver_unregister(&lcs_group_driver);
2498         ccw_driver_unregister(&lcs_ccw_driver);
2499         root_device_unregister(lcs_root_dev);
2500         lcs_unregister_debug_facility();
2501 }
2502
2503 module_init(lcs_init_module);
2504 module_exit(lcs_cleanup_module);
2505
2506 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2507 MODULE_LICENSE("GPL");
2508