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 #define PRINTK_HEADER           " lcs: "
  58
  59 /**
  60  * initialization string for output
  61  */
  62
  63 static char version[] __initdata = "LCS driver";
  64 static char debug_buffer[255];
  65
  66 /**
  67  * Some prototypes.
  68  */
  69 static void lcs_tasklet(unsigned long);
  70 static void lcs_start_kernel_thread(struct work_struct *);
  71 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
  72 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
  73 static int lcs_recovery(void *ptr);
  74
  75 /**
  76  * Debug Facility Stuff
  77  */
  78 static debug_info_t *lcs_dbf_setup;
  79 static debug_info_t *lcs_dbf_trace;
  80
  81 /**
  82  *  LCS Debug Facility functions
  83  */
  84 static void
  85 lcs_unregister_debug_facility(void)
  86 {
  87         if (lcs_dbf_setup)
  88                 debug_unregister(lcs_dbf_setup);
  89         if (lcs_dbf_trace)
  90                 debug_unregister(lcs_dbf_trace);
  91 }
  92
  93 static int
  94 lcs_register_debug_facility(void)
  95 {
  96         lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
  97         lcs_dbf_trace = debug_register("lcs_trace", 2, 2, 8);
  98         if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
  99                 PRINT_ERR("Not enough memory for debug facility.\n");
 100                 lcs_unregister_debug_facility();
 101                 return -ENOMEM;
 102         }
 103         debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
 104         debug_set_level(lcs_dbf_setup, 2);
 105         debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
 106         debug_set_level(lcs_dbf_trace, 2);
 107         return 0;
 108 }
 109
 110 /**
 111  * Allocate io buffers.
 112  */
 113 static int
 114 lcs_alloc_channel(struct lcs_channel *channel)
 115 {
 116         int cnt;
 117
 118         LCS_DBF_TEXT(2, setup, "ichalloc");
 119         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 120                 /* alloc memory fo iobuffer */
 121                 channel->iob[cnt].data =
 122                         kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
 123                 if (channel->iob[cnt].data == NULL)
 124                         break;
 125                 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
 126         }
 127         if (cnt < LCS_NUM_BUFFS) {
 128                 /* Not all io buffers could be allocated. */
 129                 LCS_DBF_TEXT(2, setup, "echalloc");
 130                 while (cnt-- > 0)
 131                         kfree(channel->iob[cnt].data);
 132                 return -ENOMEM;
 133         }
 134         return 0;
 135 }
 136
 137 /**
 138  * Free io buffers.
 139  */
 140 static void
 141 lcs_free_channel(struct lcs_channel *channel)
 142 {
 143         int cnt;
 144
 145         LCS_DBF_TEXT(2, setup, "ichfree");
 146         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 147                 kfree(channel->iob[cnt].data);
 148                 channel->iob[cnt].data = NULL;
 149         }
 150 }
 151
 152 /*
 153  * Cleanup channel.
 154  */
 155 static void
 156 lcs_cleanup_channel(struct lcs_channel *channel)
 157 {
 158         LCS_DBF_TEXT(3, setup, "cleanch");
 159         /* Kill write channel tasklets. */
 160         tasklet_kill(&channel->irq_tasklet);
 161         /* Free channel buffers. */
 162         lcs_free_channel(channel);
 163 }
 164
 165 /**
 166  * LCS free memory for card and channels.
 167  */
 168 static void
 169 lcs_free_card(struct lcs_card *card)
 170 {
 171         LCS_DBF_TEXT(2, setup, "remcard");
 172         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 173         kfree(card);
 174 }
 175
 176 /**
 177  * LCS alloc memory for card and channels
 178  */
 179 static struct lcs_card *
 180 lcs_alloc_card(void)
 181 {
 182         struct lcs_card *card;
 183         int rc;
 184
 185         LCS_DBF_TEXT(2, setup, "alloclcs");
 186
 187         card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
 188         if (card == NULL)
 189                 return NULL;
 190         card->lan_type = LCS_FRAME_TYPE_AUTO;
 191         card->pkt_seq = 0;
 192         card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
 193         /* Allocate io buffers for the read channel. */
 194         rc = lcs_alloc_channel(&card->read);
 195         if (rc){
 196                 LCS_DBF_TEXT(2, setup, "iccwerr");
 197                 lcs_free_card(card);
 198                 return NULL;
 199         }
 200         /* Allocate io buffers for the write channel. */
 201         rc = lcs_alloc_channel(&card->write);
 202         if (rc) {
 203                 LCS_DBF_TEXT(2, setup, "iccwerr");
 204                 lcs_cleanup_channel(&card->read);
 205                 lcs_free_card(card);
 206                 return NULL;
 207         }
 208
 209 #ifdef CONFIG_IP_MULTICAST
 210         INIT_LIST_HEAD(&card->ipm_list);
 211 #endif
 212         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 213         return card;
 214 }
 215
 216 /*
 217  * Setup read channel.
 218  */
 219 static void
 220 lcs_setup_read_ccws(struct lcs_card *card)
 221 {
 222         int cnt;
 223
 224         LCS_DBF_TEXT(2, setup, "ireadccw");
 225         /* Setup read ccws. */
 226         memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
 227         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 228                 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
 229                 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
 230                 card->read.ccws[cnt].flags =
 231                         CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
 232                 /*
 233                  * Note: we have allocated the buffer with GFP_DMA, so
 234                  * we do not need to do set_normalized_cda.
 235                  */
 236                 card->read.ccws[cnt].cda =
 237                         (__u32) __pa(card->read.iob[cnt].data);
 238                 ((struct lcs_header *)
 239                  card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
 240                 card->read.iob[cnt].callback = lcs_get_frames_cb;
 241                 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
 242                 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
 243         }
 244         card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
 245         card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
 246         card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
 247         /* Last ccw is a tic (transfer in channel). */
 248         card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 249         card->read.ccws[LCS_NUM_BUFFS].cda =
 250                 (__u32) __pa(card->read.ccws);
 251         /* Setg initial state of the read channel. */
 252         card->read.state = LCS_CH_STATE_INIT;
 253
 254         card->read.io_idx = 0;
 255         card->read.buf_idx = 0;
 256 }
 257
 258 static void
 259 lcs_setup_read(struct lcs_card *card)
 260 {
 261         LCS_DBF_TEXT(3, setup, "initread");
 262
 263         lcs_setup_read_ccws(card);
 264         /* Initialize read channel tasklet. */
 265         card->read.irq_tasklet.data = (unsigned long) &card->read;
 266         card->read.irq_tasklet.func = lcs_tasklet;
 267         /* Initialize waitqueue. */
 268         init_waitqueue_head(&card->read.wait_q);
 269 }
 270
 271 /*
 272  * Setup write channel.
 273  */
 274 static void
 275 lcs_setup_write_ccws(struct lcs_card *card)
 276 {
 277         int cnt;
 278
 279         LCS_DBF_TEXT(3, setup, "iwritccw");
 280         /* Setup write ccws. */
 281         memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
 282         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 283                 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
 284                 card->write.ccws[cnt].count = 0;
 285                 card->write.ccws[cnt].flags =
 286                         CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
 287                 /*
 288                  * Note: we have allocated the buffer with GFP_DMA, so
 289                  * we do not need to do set_normalized_cda.
 290                  */
 291                 card->write.ccws[cnt].cda =
 292                         (__u32) __pa(card->write.iob[cnt].data);
 293         }
 294         /* Last ccw is a tic (transfer in channel). */
 295         card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 296         card->write.ccws[LCS_NUM_BUFFS].cda =
 297                 (__u32) __pa(card->write.ccws);
 298         /* Set initial state of the write channel. */
 299         card->read.state = LCS_CH_STATE_INIT;
 300
 301         card->write.io_idx = 0;
 302         card->write.buf_idx = 0;
 303 }
 304
 305 static void
 306 lcs_setup_write(struct lcs_card *card)
 307 {
 308         LCS_DBF_TEXT(3, setup, "initwrit");
 309
 310         lcs_setup_write_ccws(card);
 311         /* Initialize write channel tasklet. */
 312         card->write.irq_tasklet.data = (unsigned long) &card->write;
 313         card->write.irq_tasklet.func = lcs_tasklet;
 314         /* Initialize waitqueue. */
 315         init_waitqueue_head(&card->write.wait_q);
 316 }
 317
 318 static void
 319 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
 320 {
 321         unsigned long flags;
 322
 323         spin_lock_irqsave(&card->mask_lock, flags);
 324         card->thread_allowed_mask = threads;
 325         spin_unlock_irqrestore(&card->mask_lock, flags);
 326         wake_up(&card->wait_q);
 327 }
 328 static inline int
 329 lcs_threads_running(struct lcs_card *card, unsigned long threads)
 330 {
 331         unsigned long flags;
 332         int rc = 0;
 333
 334         spin_lock_irqsave(&card->mask_lock, flags);
 335         rc = (card->thread_running_mask & threads);
 336         spin_unlock_irqrestore(&card->mask_lock, flags);
 337         return rc;
 338 }
 339
 340 static int
 341 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
 342 {
 343         return wait_event_interruptible(card->wait_q,
 344                         lcs_threads_running(card, threads) == 0);
 345 }
 346
 347 static inline int
 348 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
 349 {
 350         unsigned long flags;
 351
 352         spin_lock_irqsave(&card->mask_lock, flags);
 353         if ( !(card->thread_allowed_mask & thread) ||
 354               (card->thread_start_mask & thread) ) {
 355                 spin_unlock_irqrestore(&card->mask_lock, flags);
 356                 return -EPERM;
 357         }
 358         card->thread_start_mask |= thread;
 359         spin_unlock_irqrestore(&card->mask_lock, flags);
 360         return 0;
 361 }
 362
 363 static void
 364 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
 365 {
 366         unsigned long flags;
 367
 368         spin_lock_irqsave(&card->mask_lock, flags);
 369         card->thread_running_mask &= ~thread;
 370         spin_unlock_irqrestore(&card->mask_lock, flags);
 371         wake_up(&card->wait_q);
 372 }
 373
 374 static inline int
 375 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 376 {
 377         unsigned long flags;
 378         int rc = 0;
 379
 380         spin_lock_irqsave(&card->mask_lock, flags);
 381         if (card->thread_start_mask & thread){
 382                 if ((card->thread_allowed_mask & thread) &&
 383                     !(card->thread_running_mask & thread)){
 384                         rc = 1;
 385                         card->thread_start_mask &= ~thread;
 386                         card->thread_running_mask |= thread;
 387                 } else
 388                         rc = -EPERM;
 389         }
 390         spin_unlock_irqrestore(&card->mask_lock, flags);
 391         return rc;
 392 }
 393
 394 static int
 395 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 396 {
 397         int rc = 0;
 398         wait_event(card->wait_q,
 399                    (rc = __lcs_do_run_thread(card, thread)) >= 0);
 400         return rc;
 401 }
 402
 403 static int
 404 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
 405 {
 406         unsigned long flags;
 407         int rc = 0;
 408
 409         spin_lock_irqsave(&card->mask_lock, flags);
 410         LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
 411                         (u8) card->thread_start_mask,
 412                         (u8) card->thread_allowed_mask,
 413                         (u8) card->thread_running_mask);
 414         rc = (card->thread_start_mask & thread);
 415         spin_unlock_irqrestore(&card->mask_lock, flags);
 416         return rc;
 417 }
 418
 419 /**
 420  * Initialize channels,card and state machines.
 421  */
 422 static void
 423 lcs_setup_card(struct lcs_card *card)
 424 {
 425         LCS_DBF_TEXT(2, setup, "initcard");
 426         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 427
 428         lcs_setup_read(card);
 429         lcs_setup_write(card);
 430         /* Set cards initial state. */
 431         card->state = DEV_STATE_DOWN;
 432         card->tx_buffer = NULL;
 433         card->tx_emitted = 0;
 434
 435         init_waitqueue_head(&card->wait_q);
 436         spin_lock_init(&card->lock);
 437         spin_lock_init(&card->ipm_lock);
 438         spin_lock_init(&card->mask_lock);
 439 #ifdef CONFIG_IP_MULTICAST
 440         INIT_LIST_HEAD(&card->ipm_list);
 441 #endif
 442         INIT_LIST_HEAD(&card->lancmd_waiters);
 443 }
 444
 445 static inline void
 446 lcs_clear_multicast_list(struct lcs_card *card)
 447 {
 448 #ifdef  CONFIG_IP_MULTICAST
 449         struct lcs_ipm_list *ipm;
 450         unsigned long flags;
 451
 452         /* Free multicast list. */
 453         LCS_DBF_TEXT(3, setup, "clmclist");
 454         spin_lock_irqsave(&card->ipm_lock, flags);
 455         while (!list_empty(&card->ipm_list)){
 456                 ipm = list_entry(card->ipm_list.next,
 457                                  struct lcs_ipm_list, list);
 458                 list_del(&ipm->list);
 459                 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
 460                         spin_unlock_irqrestore(&card->ipm_lock, flags);
 461                         lcs_send_delipm(card, ipm);
 462                         spin_lock_irqsave(&card->ipm_lock, flags);
 463                 }
 464                 kfree(ipm);
 465         }
 466         spin_unlock_irqrestore(&card->ipm_lock, flags);
 467 #endif
 468 }
 469 /**
 470  * Cleanup channels,card and state machines.
 471  */
 472 static void
 473 lcs_cleanup_card(struct lcs_card *card)
 474 {
 475
 476         LCS_DBF_TEXT(3, setup, "cleancrd");
 477         LCS_DBF_HEX(2,setup,&card,sizeof(void*));
 478
 479         if (card->dev != NULL)
 480                 free_netdev(card->dev);
 481         /* Cleanup channels. */
 482         lcs_cleanup_channel(&card->write);
 483         lcs_cleanup_channel(&card->read);
 484 }
 485
 486 /**
 487  * Start channel.
 488  */
 489 static int
 490 lcs_start_channel(struct lcs_channel *channel)
 491 {
 492         unsigned long flags;
 493         int rc;
 494
 495         LCS_DBF_TEXT_(4,trace,"ssch%s", channel->ccwdev->dev.bus_id);
 496         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 497         rc = ccw_device_start(channel->ccwdev,
 498                               channel->ccws + channel->io_idx, 0, 0,
 499                               DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
 500         if (rc == 0)
 501                 channel->state = LCS_CH_STATE_RUNNING;
 502         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 503         if (rc) {
 504                 LCS_DBF_TEXT_(4,trace,"essh%s", channel->ccwdev->dev.bus_id);
 505                 PRINT_ERR("Error in starting channel, rc=%d!\n", rc);
 506         }
 507         return rc;
 508 }
 509
 510 static int
 511 lcs_clear_channel(struct lcs_channel *channel)
 512 {
 513         unsigned long flags;
 514         int rc;
 515
 516         LCS_DBF_TEXT(4,trace,"clearch");
 517         LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
 518         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 519         rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
 520         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 521         if (rc) {
 522                 LCS_DBF_TEXT_(4,trace,"ecsc%s", channel->ccwdev->dev.bus_id);
 523                 return rc;
 524         }
 525         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
 526         channel->state = LCS_CH_STATE_STOPPED;
 527         return rc;
 528 }
 529
 530
 531 /**
 532  * Stop channel.
 533  */
 534 static int
 535 lcs_stop_channel(struct lcs_channel *channel)
 536 {
 537         unsigned long flags;
 538         int rc;
 539
 540         if (channel->state == LCS_CH_STATE_STOPPED)
 541                 return 0;
 542         LCS_DBF_TEXT(4,trace,"haltsch");
 543         LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
 544         channel->state = LCS_CH_STATE_INIT;
 545         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 546         rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
 547         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 548         if (rc) {
 549                 LCS_DBF_TEXT_(4,trace,"ehsc%s", channel->ccwdev->dev.bus_id);
 550                 return rc;
 551         }
 552         /* Asynchronous halt initialted. Wait for its completion. */
 553         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
 554         lcs_clear_channel(channel);
 555         return 0;
 556 }
 557
 558 /**
 559  * start read and write channel
 560  */
 561 static int
 562 lcs_start_channels(struct lcs_card *card)
 563 {
 564         int rc;
 565
 566         LCS_DBF_TEXT(2, trace, "chstart");
 567         /* start read channel */
 568         rc = lcs_start_channel(&card->read);
 569         if (rc)
 570                 return rc;
 571         /* start write channel */
 572         rc = lcs_start_channel(&card->write);
 573         if (rc)
 574                 lcs_stop_channel(&card->read);
 575         return rc;
 576 }
 577
 578 /**
 579  * stop read and write channel
 580  */
 581 static int
 582 lcs_stop_channels(struct lcs_card *card)
 583 {
 584         LCS_DBF_TEXT(2, trace, "chhalt");
 585         lcs_stop_channel(&card->read);
 586         lcs_stop_channel(&card->write);
 587         return 0;
 588 }
 589
 590 /**
 591  * Get empty buffer.
 592  */
 593 static struct lcs_buffer *
 594 __lcs_get_buffer(struct lcs_channel *channel)
 595 {
 596         int index;
 597
 598         LCS_DBF_TEXT(5, trace, "_getbuff");
 599         index = channel->io_idx;
 600         do {
 601                 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
 602                         channel->iob[index].state = LCS_BUF_STATE_LOCKED;
 603                         return channel->iob + index;
 604                 }
 605                 index = (index + 1) & (LCS_NUM_BUFFS - 1);
 606         } while (index != channel->io_idx);
 607         return NULL;
 608 }
 609
 610 static struct lcs_buffer *
 611 lcs_get_buffer(struct lcs_channel *channel)
 612 {
 613         struct lcs_buffer *buffer;
 614         unsigned long flags;
 615
 616         LCS_DBF_TEXT(5, trace, "getbuff");
 617         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 618         buffer = __lcs_get_buffer(channel);
 619         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 620         return buffer;
 621 }
 622
 623 /**
 624  * Resume channel program if the channel is suspended.
 625  */
 626 static int
 627 __lcs_resume_channel(struct lcs_channel *channel)
 628 {
 629         int rc;
 630
 631         if (channel->state != LCS_CH_STATE_SUSPENDED)
 632                 return 0;
 633         if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
 634                 return 0;
 635         LCS_DBF_TEXT_(5, trace, "rsch%s", channel->ccwdev->dev.bus_id);
 636         rc = ccw_device_resume(channel->ccwdev);
 637         if (rc) {
 638                 LCS_DBF_TEXT_(4, trace, "ersc%s", channel->ccwdev->dev.bus_id);
 639                 PRINT_ERR("Error in lcs_resume_channel: rc=%d\n",rc);
 640         } else
 641                 channel->state = LCS_CH_STATE_RUNNING;
 642         return rc;
 643
 644 }
 645
 646 /**
 647  * Make a buffer ready for processing.
 648  */
 649 static inline void
 650 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
 651 {
 652         int prev, next;
 653
 654         LCS_DBF_TEXT(5, trace, "rdybits");
 655         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 656         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 657         /* Check if we may clear the suspend bit of this buffer. */
 658         if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
 659                 /* Check if we have to set the PCI bit. */
 660                 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
 661                         /* Suspend bit of the previous buffer is not set. */
 662                         channel->ccws[index].flags |= CCW_FLAG_PCI;
 663                 /* Suspend bit of the next buffer is set. */
 664                 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
 665         }
 666 }
 667
 668 static int
 669 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 670 {
 671         unsigned long flags;
 672         int index, rc;
 673
 674         LCS_DBF_TEXT(5, trace, "rdybuff");
 675         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 676                buffer->state != LCS_BUF_STATE_PROCESSED);
 677         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 678         buffer->state = LCS_BUF_STATE_READY;
 679         index = buffer - channel->iob;
 680         /* Set length. */
 681         channel->ccws[index].count = buffer->count;
 682         /* Check relevant PCI/suspend bits. */
 683         __lcs_ready_buffer_bits(channel, index);
 684         rc = __lcs_resume_channel(channel);
 685         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 686         return rc;
 687 }
 688
 689 /**
 690  * Mark the buffer as processed. Take care of the suspend bit
 691  * of the previous buffer. This function is called from
 692  * interrupt context, so the lock must not be taken.
 693  */
 694 static int
 695 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 696 {
 697         int index, prev, next;
 698
 699         LCS_DBF_TEXT(5, trace, "prcsbuff");
 700         BUG_ON(buffer->state != LCS_BUF_STATE_READY);
 701         buffer->state = LCS_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 == LCS_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         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 733                buffer->state != LCS_BUF_STATE_PROCESSED);
 734         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 735         buffer->state = LCS_BUF_STATE_EMPTY;
 736         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 737 }
 738
 739 /**
 740  * Get buffer for a lan command.
 741  */
 742 static struct lcs_buffer *
 743 lcs_get_lancmd(struct lcs_card *card, int count)
 744 {
 745         struct lcs_buffer *buffer;
 746         struct lcs_cmd *cmd;
 747
 748         LCS_DBF_TEXT(4, trace, "getlncmd");
 749         /* Get buffer and wait if none is available. */
 750         wait_event(card->write.wait_q,
 751                    ((buffer = lcs_get_buffer(&card->write)) != NULL));
 752         count += sizeof(struct lcs_header);
 753         *(__u16 *)(buffer->data + count) = 0;
 754         buffer->count = count + sizeof(__u16);
 755         buffer->callback = lcs_release_buffer;
 756         cmd = (struct lcs_cmd *) buffer->data;
 757         cmd->offset = count;
 758         cmd->type = LCS_FRAME_TYPE_CONTROL;
 759         cmd->slot = 0;
 760         return buffer;
 761 }
 762
 763
 764 static void
 765 lcs_get_reply(struct lcs_reply *reply)
 766 {
 767         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 768         atomic_inc(&reply->refcnt);
 769 }
 770
 771 static void
 772 lcs_put_reply(struct lcs_reply *reply)
 773 {
 774         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 775         if (atomic_dec_and_test(&reply->refcnt)) {
 776                 kfree(reply);
 777         }
 778
 779 }
 780
 781 static struct lcs_reply *
 782 lcs_alloc_reply(struct lcs_cmd *cmd)
 783 {
 784         struct lcs_reply *reply;
 785
 786         LCS_DBF_TEXT(4, trace, "getreply");
 787
 788         reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
 789         if (!reply)
 790                 return NULL;
 791         atomic_set(&reply->refcnt,1);
 792         reply->sequence_no = cmd->sequence_no;
 793         reply->received = 0;
 794         reply->rc = 0;
 795         init_waitqueue_head(&reply->wait_q);
 796
 797         return reply;
 798 }
 799
 800 /**
 801  * Notifier function for lancmd replies. Called from read irq.
 802  */
 803 static void
 804 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
 805 {
 806         struct list_head *l, *n;
 807         struct lcs_reply *reply;
 808
 809         LCS_DBF_TEXT(4, trace, "notiwait");
 810         spin_lock(&card->lock);
 811         list_for_each_safe(l, n, &card->lancmd_waiters) {
 812                 reply = list_entry(l, struct lcs_reply, list);
 813                 if (reply->sequence_no == cmd->sequence_no) {
 814                         lcs_get_reply(reply);
 815                         list_del_init(&reply->list);
 816                         if (reply->callback != NULL)
 817                                 reply->callback(card, cmd);
 818                         reply->received = 1;
 819                         reply->rc = cmd->return_code;
 820                         wake_up(&reply->wait_q);
 821                         lcs_put_reply(reply);
 822                         break;
 823                 }
 824         }
 825         spin_unlock(&card->lock);
 826 }
 827
 828 /**
 829  * Emit buffer of a lan comand.
 830  */
 831 static void
 832 lcs_lancmd_timeout(unsigned long data)
 833 {
 834         struct lcs_reply *reply, *list_reply, *r;
 835         unsigned long flags;
 836
 837         LCS_DBF_TEXT(4, trace, "timeout");
 838         reply = (struct lcs_reply *) data;
 839         spin_lock_irqsave(&reply->card->lock, flags);
 840         list_for_each_entry_safe(list_reply, r,
 841                                  &reply->card->lancmd_waiters,list) {
 842                 if (reply == list_reply) {
 843                         lcs_get_reply(reply);
 844                         list_del_init(&reply->list);
 845                         spin_unlock_irqrestore(&reply->card->lock, flags);
 846                         reply->received = 1;
 847                         reply->rc = -ETIME;
 848                         wake_up(&reply->wait_q);
 849                         lcs_put_reply(reply);
 850                         return;
 851                 }
 852         }
 853         spin_unlock_irqrestore(&reply->card->lock, flags);
 854 }
 855
 856 static int
 857 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
 858                 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
 859 {
 860         struct lcs_reply *reply;
 861         struct lcs_cmd *cmd;
 862         struct timer_list timer;
 863         unsigned long flags;
 864         int rc;
 865
 866         LCS_DBF_TEXT(4, trace, "sendcmd");
 867         cmd = (struct lcs_cmd *) buffer->data;
 868         cmd->return_code = 0;
 869         cmd->sequence_no = card->sequence_no++;
 870         reply = lcs_alloc_reply(cmd);
 871         if (!reply)
 872                 return -ENOMEM;
 873         reply->callback = reply_callback;
 874         reply->card = card;
 875         spin_lock_irqsave(&card->lock, flags);
 876         list_add_tail(&reply->list, &card->lancmd_waiters);
 877         spin_unlock_irqrestore(&card->lock, flags);
 878
 879         buffer->callback = lcs_release_buffer;
 880         rc = lcs_ready_buffer(&card->write, buffer);
 881         if (rc)
 882                 return rc;
 883         init_timer(&timer);
 884         timer.function = lcs_lancmd_timeout;
 885         timer.data = (unsigned long) reply;
 886         timer.expires = jiffies + HZ*card->lancmd_timeout;
 887         add_timer(&timer);
 888         wait_event(reply->wait_q, reply->received);
 889         del_timer_sync(&timer);
 890         LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
 891         rc = reply->rc;
 892         lcs_put_reply(reply);
 893         return rc ? -EIO : 0;
 894 }
 895
 896 /**
 897  * LCS startup command
 898  */
 899 static int
 900 lcs_send_startup(struct lcs_card *card, __u8 initiator)
 901 {
 902         struct lcs_buffer *buffer;
 903         struct lcs_cmd *cmd;
 904
 905         LCS_DBF_TEXT(2, trace, "startup");
 906         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 907         cmd = (struct lcs_cmd *) buffer->data;
 908         cmd->cmd_code = LCS_CMD_STARTUP;
 909         cmd->initiator = initiator;
 910         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
 911         return lcs_send_lancmd(card, buffer, NULL);
 912 }
 913
 914 /**
 915  * LCS shutdown command
 916  */
 917 static int
 918 lcs_send_shutdown(struct lcs_card *card)
 919 {
 920         struct lcs_buffer *buffer;
 921         struct lcs_cmd *cmd;
 922
 923         LCS_DBF_TEXT(2, trace, "shutdown");
 924         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 925         cmd = (struct lcs_cmd *) buffer->data;
 926         cmd->cmd_code = LCS_CMD_SHUTDOWN;
 927         cmd->initiator = LCS_INITIATOR_TCPIP;
 928         return lcs_send_lancmd(card, buffer, NULL);
 929 }
 930
 931 /**
 932  * LCS lanstat command
 933  */
 934 static void
 935 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 936 {
 937         LCS_DBF_TEXT(2, trace, "statcb");
 938         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
 939 }
 940
 941 static int
 942 lcs_send_lanstat(struct lcs_card *card)
 943 {
 944         struct lcs_buffer *buffer;
 945         struct lcs_cmd *cmd;
 946
 947         LCS_DBF_TEXT(2,trace, "cmdstat");
 948         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 949         cmd = (struct lcs_cmd *) buffer->data;
 950         /* Setup lanstat command. */
 951         cmd->cmd_code = LCS_CMD_LANSTAT;
 952         cmd->initiator = LCS_INITIATOR_TCPIP;
 953         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 954         cmd->cmd.lcs_std_cmd.portno = card->portno;
 955         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
 956 }
 957
 958 /**
 959  * send stoplan command
 960  */
 961 static int
 962 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
 963 {
 964         struct lcs_buffer *buffer;
 965         struct lcs_cmd *cmd;
 966
 967         LCS_DBF_TEXT(2, trace, "cmdstpln");
 968         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 969         cmd = (struct lcs_cmd *) buffer->data;
 970         cmd->cmd_code = LCS_CMD_STOPLAN;
 971         cmd->initiator = initiator;
 972         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 973         cmd->cmd.lcs_std_cmd.portno = card->portno;
 974         return lcs_send_lancmd(card, buffer, NULL);
 975 }
 976
 977 /**
 978  * send startlan command
 979  */
 980 static void
 981 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 982 {
 983         LCS_DBF_TEXT(2, trace, "srtlancb");
 984         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
 985         card->portno = cmd->cmd.lcs_std_cmd.portno;
 986 }
 987
 988 static int
 989 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
 990 {
 991         struct lcs_buffer *buffer;
 992         struct lcs_cmd *cmd;
 993
 994         LCS_DBF_TEXT(2, trace, "cmdstaln");
 995         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 996         cmd = (struct lcs_cmd *) buffer->data;
 997         cmd->cmd_code = LCS_CMD_STARTLAN;
 998         cmd->initiator = initiator;
 999         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1000         cmd->cmd.lcs_std_cmd.portno = card->portno;
1001         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1002 }
1003
1004 #ifdef CONFIG_IP_MULTICAST
1005 /**
1006  * send setipm command (Multicast)
1007  */
1008 static int
1009 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1010 {
1011         struct lcs_buffer *buffer;
1012         struct lcs_cmd *cmd;
1013
1014         LCS_DBF_TEXT(2, trace, "cmdsetim");
1015         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1016         cmd = (struct lcs_cmd *) buffer->data;
1017         cmd->cmd_code = LCS_CMD_SETIPM;
1018         cmd->initiator = LCS_INITIATOR_TCPIP;
1019         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1020         cmd->cmd.lcs_qipassist.portno = card->portno;
1021         cmd->cmd.lcs_qipassist.version = 4;
1022         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1023         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1024                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1025         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1026         return lcs_send_lancmd(card, buffer, NULL);
1027 }
1028
1029 /**
1030  * send delipm command (Multicast)
1031  */
1032 static int
1033 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1034 {
1035         struct lcs_buffer *buffer;
1036         struct lcs_cmd *cmd;
1037
1038         LCS_DBF_TEXT(2, trace, "cmddelim");
1039         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1040         cmd = (struct lcs_cmd *) buffer->data;
1041         cmd->cmd_code = LCS_CMD_DELIPM;
1042         cmd->initiator = LCS_INITIATOR_TCPIP;
1043         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1044         cmd->cmd.lcs_qipassist.portno = card->portno;
1045         cmd->cmd.lcs_qipassist.version = 4;
1046         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1047         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1048                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1049         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1050         return lcs_send_lancmd(card, buffer, NULL);
1051 }
1052
1053 /**
1054  * check if multicast is supported by LCS
1055  */
1056 static void
1057 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1058 {
1059         LCS_DBF_TEXT(2, trace, "chkmccb");
1060         card->ip_assists_supported =
1061                 cmd->cmd.lcs_qipassist.ip_assists_supported;
1062         card->ip_assists_enabled =
1063                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1064 }
1065
1066 static int
1067 lcs_check_multicast_support(struct lcs_card *card)
1068 {
1069         struct lcs_buffer *buffer;
1070         struct lcs_cmd *cmd;
1071         int rc;
1072
1073         LCS_DBF_TEXT(2, trace, "cmdqipa");
1074         /* Send query ipassist. */
1075         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1076         cmd = (struct lcs_cmd *) buffer->data;
1077         cmd->cmd_code = LCS_CMD_QIPASSIST;
1078         cmd->initiator = LCS_INITIATOR_TCPIP;
1079         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1080         cmd->cmd.lcs_qipassist.portno = card->portno;
1081         cmd->cmd.lcs_qipassist.version = 4;
1082         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1083         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1084         if (rc != 0) {
1085                 PRINT_ERR("Query IPAssist failed. Assuming unsupported!\n");
1086                 return -EOPNOTSUPP;
1087         }
1088         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1089                 return 0;
1090         return -EOPNOTSUPP;
1091 }
1092
1093 /**
1094  * set or del multicast address on LCS card
1095  */
1096 static void
1097 lcs_fix_multicast_list(struct lcs_card *card)
1098 {
1099         struct list_head failed_list;
1100         struct lcs_ipm_list *ipm, *tmp;
1101         unsigned long flags;
1102         int rc;
1103
1104         LCS_DBF_TEXT(4,trace, "fixipm");
1105         INIT_LIST_HEAD(&failed_list);
1106         spin_lock_irqsave(&card->ipm_lock, flags);
1107 list_modified:
1108         list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1109                 switch (ipm->ipm_state) {
1110                 case LCS_IPM_STATE_SET_REQUIRED:
1111                         /* del from ipm_list so noone else can tamper with
1112                          * this entry */
1113                         list_del_init(&ipm->list);
1114                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1115                         rc = lcs_send_setipm(card, ipm);
1116                         spin_lock_irqsave(&card->ipm_lock, flags);
1117                         if (rc) {
1118                                 PRINT_INFO("Adding multicast address failed."
1119                                            "Table possibly full!\n");
1120                                 /* store ipm in failed list -> will be added
1121                                  * to ipm_list again, so a retry will be done
1122                                  * during the next call of this function */
1123                                 list_add_tail(&ipm->list, &failed_list);
1124                         } else {
1125                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1126                                 /* re-insert into ipm_list */
1127                                 list_add_tail(&ipm->list, &card->ipm_list);
1128                         }
1129                         goto list_modified;
1130                 case LCS_IPM_STATE_DEL_REQUIRED:
1131                         list_del(&ipm->list);
1132                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1133                         lcs_send_delipm(card, ipm);
1134                         spin_lock_irqsave(&card->ipm_lock, flags);
1135                         kfree(ipm);
1136                         goto list_modified;
1137                 case LCS_IPM_STATE_ON_CARD:
1138                         break;
1139                 }
1140         }
1141         /* re-insert all entries from the failed_list into ipm_list */
1142         list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1143                 list_move_tail(&ipm->list, &card->ipm_list);
1144
1145         spin_unlock_irqrestore(&card->ipm_lock, flags);
1146 }
1147
1148 /**
1149  * get mac address for the relevant Multicast address
1150  */
1151 static void
1152 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1153 {
1154         LCS_DBF_TEXT(4,trace, "getmac");
1155         if (dev->type == ARPHRD_IEEE802_TR)
1156                 ip_tr_mc_map(ipm, mac);
1157         else
1158                 ip_eth_mc_map(ipm, mac);
1159 }
1160
1161 /**
1162  * function called by net device to handle multicast address relevant things
1163  */
1164 static inline void
1165 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1166 {
1167         struct ip_mc_list *im4;
1168         struct list_head *l;
1169         struct lcs_ipm_list *ipm;
1170         unsigned long flags;
1171         char buf[MAX_ADDR_LEN];
1172
1173         LCS_DBF_TEXT(4, trace, "remmclst");
1174         spin_lock_irqsave(&card->ipm_lock, flags);
1175         list_for_each(l, &card->ipm_list) {
1176                 ipm = list_entry(l, struct lcs_ipm_list, list);
1177                 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
1178                         lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1179                         if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1180                              (memcmp(buf, &ipm->ipm.mac_addr,
1181                                      LCS_MAC_LENGTH) == 0) )
1182                                 break;
1183                 }
1184                 if (im4 == NULL)
1185                         ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1186         }
1187         spin_unlock_irqrestore(&card->ipm_lock, flags);
1188 }
1189
1190 static inline struct lcs_ipm_list *
1191 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1192 {
1193         struct lcs_ipm_list *tmp, *ipm = NULL;
1194         struct list_head *l;
1195         unsigned long flags;
1196
1197         LCS_DBF_TEXT(4, trace, "chkmcent");
1198         spin_lock_irqsave(&card->ipm_lock, flags);
1199         list_for_each(l, &card->ipm_list) {
1200                 tmp = list_entry(l, struct lcs_ipm_list, list);
1201                 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1202                      (memcmp(buf, &tmp->ipm.mac_addr,
1203                              LCS_MAC_LENGTH) == 0) ) {
1204                         ipm = tmp;
1205                         break;
1206                 }
1207         }
1208         spin_unlock_irqrestore(&card->ipm_lock, flags);
1209         return ipm;
1210 }
1211
1212 static inline void
1213 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1214 {
1215
1216         struct ip_mc_list *im4;
1217         struct lcs_ipm_list *ipm;
1218         char buf[MAX_ADDR_LEN];
1219         unsigned long flags;
1220
1221         LCS_DBF_TEXT(4, trace, "setmclst");
1222         for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
1223                 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1224                 ipm = lcs_check_addr_entry(card, im4, buf);
1225                 if (ipm != NULL)
1226                         continue;       /* Address already in list. */
1227                 ipm = (struct lcs_ipm_list *)
1228                         kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1229                 if (ipm == NULL) {
1230                         PRINT_INFO("Not enough memory to add "
1231                                    "new multicast entry!\n");
1232                         break;
1233                 }
1234                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1235                 ipm->ipm.ip_addr = im4->multiaddr;
1236                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1237                 spin_lock_irqsave(&card->ipm_lock, flags);
1238                 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1239                 list_add(&ipm->list, &card->ipm_list);
1240                 spin_unlock_irqrestore(&card->ipm_lock, flags);
1241         }
1242 }
1243
1244 static int
1245 lcs_register_mc_addresses(void *data)
1246 {
1247         struct lcs_card *card;
1248         struct in_device *in4_dev;
1249
1250         card = (struct lcs_card *) data;
1251         daemonize("regipm");
1252
1253         if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1254                 return 0;
1255         LCS_DBF_TEXT(4, trace, "regmulti");
1256
1257         in4_dev = in_dev_get(card->dev);
1258         if (in4_dev == NULL)
1259                 goto out;
1260         read_lock(&in4_dev->mc_list_lock);
1261         lcs_remove_mc_addresses(card,in4_dev);
1262         lcs_set_mc_addresses(card, in4_dev);
1263         read_unlock(&in4_dev->mc_list_lock);
1264         in_dev_put(in4_dev);
1265
1266         netif_carrier_off(card->dev);
1267         netif_tx_disable(card->dev);
1268         wait_event(card->write.wait_q,
1269                         (card->write.state != LCS_CH_STATE_RUNNING));
1270         lcs_fix_multicast_list(card);
1271         if (card->state == DEV_STATE_UP) {
1272                 netif_carrier_on(card->dev);
1273                 netif_wake_queue(card->dev);
1274         }
1275 out:
1276         lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1277         return 0;
1278 }
1279 /**
1280  * function called by net device to
1281  * handle multicast address relevant things
1282  */
1283 static void
1284 lcs_set_multicast_list(struct net_device *dev)
1285 {
1286         struct lcs_card *card;
1287
1288         LCS_DBF_TEXT(4, trace, "setmulti");
1289         card = (struct lcs_card *) dev->priv;
1290
1291         if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1292                 schedule_work(&card->kernel_thread_starter);
1293 }
1294
1295 #endif /* CONFIG_IP_MULTICAST */
1296
1297 static long
1298 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1299 {
1300         if (!IS_ERR(irb))
1301                 return 0;
1302
1303         switch (PTR_ERR(irb)) {
1304         case -EIO:
1305                 PRINT_WARN("i/o-error on device %s\n", cdev->dev.bus_id);
1306                 LCS_DBF_TEXT(2, trace, "ckirberr");
1307                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1308                 break;
1309         case -ETIMEDOUT:
1310                 PRINT_WARN("timeout on device %s\n", cdev->dev.bus_id);
1311                 LCS_DBF_TEXT(2, trace, "ckirberr");
1312                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1313                 break;
1314         default:
1315                 PRINT_WARN("unknown error %ld on device %s\n", PTR_ERR(irb),
1316                            cdev->dev.bus_id);
1317                 LCS_DBF_TEXT(2, trace, "ckirberr");
1318                 LCS_DBF_TEXT(2, trace, "  rc???");
1319         }
1320         return PTR_ERR(irb);
1321 }
1322
1323 static int
1324 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1325 {
1326         int dstat, cstat;
1327         char *sense;
1328
1329         sense = (char *) irb->ecw;
1330         cstat = irb->scsw.cstat;
1331         dstat = irb->scsw.dstat;
1332
1333         if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1334                      SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1335                      SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
1336                 LCS_DBF_TEXT(2, trace, "CGENCHK");
1337                 return 1;
1338         }
1339         if (dstat & DEV_STAT_UNIT_CHECK) {
1340                 if (sense[LCS_SENSE_BYTE_1] &
1341                     LCS_SENSE_RESETTING_EVENT) {
1342                         LCS_DBF_TEXT(2, trace, "REVIND");
1343                         return 1;
1344                 }
1345                 if (sense[LCS_SENSE_BYTE_0] &
1346                     LCS_SENSE_CMD_REJECT) {
1347                         LCS_DBF_TEXT(2, trace, "CMDREJ");
1348                         return 0;
1349                 }
1350                 if ((!sense[LCS_SENSE_BYTE_0]) &&
1351                     (!sense[LCS_SENSE_BYTE_1]) &&
1352                     (!sense[LCS_SENSE_BYTE_2]) &&
1353                     (!sense[LCS_SENSE_BYTE_3])) {
1354                         LCS_DBF_TEXT(2, trace, "ZEROSEN");
1355                         return 0;
1356                 }
1357                 LCS_DBF_TEXT(2, trace, "DGENCHK");
1358                 return 1;
1359         }
1360         return 0;
1361 }
1362
1363 static void
1364 lcs_schedule_recovery(struct lcs_card *card)
1365 {
1366         LCS_DBF_TEXT(2, trace, "startrec");
1367         if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1368                 schedule_work(&card->kernel_thread_starter);
1369 }
1370
1371 /**
1372  * IRQ Handler for LCS channels
1373  */
1374 static void
1375 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1376 {
1377         struct lcs_card *card;
1378         struct lcs_channel *channel;
1379         int rc, index;
1380         int cstat, dstat;
1381
1382         if (lcs_check_irb_error(cdev, irb))
1383                 return;
1384
1385         card = CARD_FROM_DEV(cdev);
1386         if (card->read.ccwdev == cdev)
1387                 channel = &card->read;
1388         else
1389                 channel = &card->write;
1390
1391         cstat = irb->scsw.cstat;
1392         dstat = irb->scsw.dstat;
1393         LCS_DBF_TEXT_(5, trace, "Rint%s",cdev->dev.bus_id);
1394         LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.cstat, irb->scsw.dstat);
1395         LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.fctl, irb->scsw.actl);
1396
1397         /* Check for channel and device errors presented */
1398         rc = lcs_get_problem(cdev, irb);
1399         if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1400                 PRINT_WARN("check on device %s, dstat=0x%X, cstat=0x%X \n",
1401                             cdev->dev.bus_id, dstat, cstat);
1402                 if (rc) {
1403                         lcs_schedule_recovery(card);
1404                         wake_up(&card->wait_q);
1405                         return;
1406                 }
1407         }
1408         /* How far in the ccw chain have we processed? */
1409         if ((channel->state != LCS_CH_STATE_INIT) &&
1410             (irb->scsw.fctl & SCSW_FCTL_START_FUNC)) {
1411                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cpa)
1412                         - channel->ccws;
1413                 if ((irb->scsw.actl & SCSW_ACTL_SUSPENDED) ||
1414                     (irb->scsw.cstat & SCHN_STAT_PCI))
1415                         /* Bloody io subsystem tells us lies about cpa... */
1416                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1417                 while (channel->io_idx != index) {
1418                         __lcs_processed_buffer(channel,
1419                                                channel->iob + channel->io_idx);
1420                         channel->io_idx =
1421                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1422                 }
1423         }
1424
1425         if ((irb->scsw.dstat & DEV_STAT_DEV_END) ||
1426             (irb->scsw.dstat & DEV_STAT_CHN_END) ||
1427             (irb->scsw.dstat & DEV_STAT_UNIT_CHECK))
1428                 /* Mark channel as stopped. */
1429                 channel->state = LCS_CH_STATE_STOPPED;
1430         else if (irb->scsw.actl & SCSW_ACTL_SUSPENDED)
1431                 /* CCW execution stopped on a suspend bit. */
1432                 channel->state = LCS_CH_STATE_SUSPENDED;
1433         if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) {
1434                 if (irb->scsw.cc != 0) {
1435                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1436                         return;
1437                 }
1438                 /* The channel has been stopped by halt_IO. */
1439                 channel->state = LCS_CH_STATE_HALTED;
1440         }
1441         if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) {
1442                 channel->state = LCS_CH_STATE_CLEARED;
1443         }
1444         /* Do the rest in the tasklet. */
1445         tasklet_schedule(&channel->irq_tasklet);
1446 }
1447
1448 /**
1449  * Tasklet for IRQ handler
1450  */
1451 static void
1452 lcs_tasklet(unsigned long data)
1453 {
1454         unsigned long flags;
1455         struct lcs_channel *channel;
1456         struct lcs_buffer *iob;
1457         int buf_idx;
1458         int rc;
1459
1460         channel = (struct lcs_channel *) data;
1461         LCS_DBF_TEXT_(5, trace, "tlet%s",channel->ccwdev->dev.bus_id);
1462
1463         /* Check for processed buffers. */
1464         iob = channel->iob;
1465         buf_idx = channel->buf_idx;
1466         while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1467                 /* Do the callback thing. */
1468                 if (iob[buf_idx].callback != NULL)
1469                         iob[buf_idx].callback(channel, iob + buf_idx);
1470                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1471         }
1472         channel->buf_idx = buf_idx;
1473
1474         if (channel->state == LCS_CH_STATE_STOPPED)
1475                 // FIXME: what if rc != 0 ??
1476                 rc = lcs_start_channel(channel);
1477         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1478         if (channel->state == LCS_CH_STATE_SUSPENDED &&
1479             channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) {
1480                 // FIXME: what if rc != 0 ??
1481                 rc = __lcs_resume_channel(channel);
1482         }
1483         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1484
1485         /* Something happened on the channel. Wake up waiters. */
1486         wake_up(&channel->wait_q);
1487 }
1488
1489 /**
1490  * Finish current tx buffer and make it ready for transmit.
1491  */
1492 static void
1493 __lcs_emit_txbuffer(struct lcs_card *card)
1494 {
1495         LCS_DBF_TEXT(5, trace, "emittx");
1496         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1497         card->tx_buffer->count += 2;
1498         lcs_ready_buffer(&card->write, card->tx_buffer);
1499         card->tx_buffer = NULL;
1500         card->tx_emitted++;
1501 }
1502
1503 /**
1504  * Callback for finished tx buffers.
1505  */
1506 static void
1507 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1508 {
1509         struct lcs_card *card;
1510
1511         LCS_DBF_TEXT(5, trace, "txbuffcb");
1512         /* Put buffer back to pool. */
1513         lcs_release_buffer(channel, buffer);
1514         card = container_of(channel, struct lcs_card, write);
1515         if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1516                 netif_wake_queue(card->dev);
1517         spin_lock(&card->lock);
1518         card->tx_emitted--;
1519         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1520                 /*
1521                  * Last running tx buffer has finished. Submit partially
1522                  * filled current buffer.
1523                  */
1524                 __lcs_emit_txbuffer(card);
1525         spin_unlock(&card->lock);
1526 }
1527
1528 /**
1529  * Packet transmit function called by network stack
1530  */
1531 static int
1532 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1533                  struct net_device *dev)
1534 {
1535         struct lcs_header *header;
1536         int rc = 0;
1537
1538         LCS_DBF_TEXT(5, trace, "hardxmit");
1539         if (skb == NULL) {
1540                 card->stats.tx_dropped++;
1541                 card->stats.tx_errors++;
1542                 return -EIO;
1543         }
1544         if (card->state != DEV_STATE_UP) {
1545                 dev_kfree_skb(skb);
1546                 card->stats.tx_dropped++;
1547                 card->stats.tx_errors++;
1548                 card->stats.tx_carrier_errors++;
1549                 return 0;
1550         }
1551         if (skb->protocol == htons(ETH_P_IPV6)) {
1552                 dev_kfree_skb(skb);
1553                 return 0;
1554         }
1555         netif_stop_queue(card->dev);
1556         spin_lock(&card->lock);
1557         if (card->tx_buffer != NULL &&
1558             card->tx_buffer->count + sizeof(struct lcs_header) +
1559             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1560                 /* skb too big for current tx buffer. */
1561                 __lcs_emit_txbuffer(card);
1562         if (card->tx_buffer == NULL) {
1563                 /* Get new tx buffer */
1564                 card->tx_buffer = lcs_get_buffer(&card->write);
1565                 if (card->tx_buffer == NULL) {
1566                         card->stats.tx_dropped++;
1567                         rc = -EBUSY;
1568                         goto out;
1569                 }
1570                 card->tx_buffer->callback = lcs_txbuffer_cb;
1571                 card->tx_buffer->count = 0;
1572         }
1573         header = (struct lcs_header *)
1574                 (card->tx_buffer->data + card->tx_buffer->count);
1575         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1576         header->offset = card->tx_buffer->count;
1577         header->type = card->lan_type;
1578         header->slot = card->portno;
1579         memcpy(header + 1, skb->data, skb->len);
1580         spin_unlock(&card->lock);
1581         card->stats.tx_bytes += skb->len;
1582         card->stats.tx_packets++;
1583         dev_kfree_skb(skb);
1584         netif_wake_queue(card->dev);
1585         spin_lock(&card->lock);
1586         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1587                 /* If this is the first tx buffer emit it immediately. */
1588                 __lcs_emit_txbuffer(card);
1589 out:
1590         spin_unlock(&card->lock);
1591         return rc;
1592 }
1593
1594 static int
1595 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1596 {
1597         struct lcs_card *card;
1598         int rc;
1599
1600         LCS_DBF_TEXT(5, trace, "pktxmit");
1601         card = (struct lcs_card *) dev->priv;
1602         rc = __lcs_start_xmit(card, skb, dev);
1603         return rc;
1604 }
1605
1606 /**
1607  * send startlan and lanstat command to make LCS device ready
1608  */
1609 static int
1610 lcs_startlan_auto(struct lcs_card *card)
1611 {
1612         int rc;
1613
1614         LCS_DBF_TEXT(2, trace, "strtauto");
1615 #ifdef CONFIG_NET_ETHERNET
1616         card->lan_type = LCS_FRAME_TYPE_ENET;
1617         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1618         if (rc == 0)
1619                 return 0;
1620
1621 #endif
1622 #ifdef CONFIG_TR
1623         card->lan_type = LCS_FRAME_TYPE_TR;
1624         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1625         if (rc == 0)
1626                 return 0;
1627 #endif
1628 #ifdef CONFIG_FDDI
1629         card->lan_type = LCS_FRAME_TYPE_FDDI;
1630         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1631         if (rc == 0)
1632                 return 0;
1633 #endif
1634         return -EIO;
1635 }
1636
1637 static int
1638 lcs_startlan(struct lcs_card *card)
1639 {
1640         int rc, i;
1641
1642         LCS_DBF_TEXT(2, trace, "startlan");
1643         rc = 0;
1644         if (card->portno != LCS_INVALID_PORT_NO) {
1645                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1646                         rc = lcs_startlan_auto(card);
1647                 else
1648                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1649         } else {
1650                 for (i = 0; i <= 16; i++) {
1651                         card->portno = i;
1652                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1653                                 rc = lcs_send_startlan(card,
1654                                                        LCS_INITIATOR_TCPIP);
1655                         else
1656                                 /* autodetecting lan type */
1657                                 rc = lcs_startlan_auto(card);
1658                         if (rc == 0)
1659                                 break;
1660                 }
1661         }
1662         if (rc == 0)
1663                 return lcs_send_lanstat(card);
1664         return rc;
1665 }
1666
1667 /**
1668  * LCS detect function
1669  * setup channels and make them I/O ready
1670  */
1671 static int
1672 lcs_detect(struct lcs_card *card)
1673 {
1674         int rc = 0;
1675
1676         LCS_DBF_TEXT(2, setup, "lcsdetct");
1677         /* start/reset card */
1678         if (card->dev)
1679                 netif_stop_queue(card->dev);
1680         rc = lcs_stop_channels(card);
1681         if (rc == 0) {
1682                 rc = lcs_start_channels(card);
1683                 if (rc == 0) {
1684                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1685                         if (rc == 0)
1686                                 rc = lcs_startlan(card);
1687                 }
1688         }
1689         if (rc == 0) {
1690                 card->state = DEV_STATE_UP;
1691         } else {
1692                 card->state = DEV_STATE_DOWN;
1693                 card->write.state = LCS_CH_STATE_INIT;
1694                 card->read.state =  LCS_CH_STATE_INIT;
1695         }
1696         return rc;
1697 }
1698
1699 /**
1700  * LCS Stop card
1701  */
1702 static int
1703 lcs_stopcard(struct lcs_card *card)
1704 {
1705         int rc;
1706
1707         LCS_DBF_TEXT(3, setup, "stopcard");
1708
1709         if (card->read.state != LCS_CH_STATE_STOPPED &&
1710             card->write.state != LCS_CH_STATE_STOPPED &&
1711             card->state == DEV_STATE_UP) {
1712                 lcs_clear_multicast_list(card);
1713                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1714                 rc = lcs_send_shutdown(card);
1715         }
1716         rc = lcs_stop_channels(card);
1717         card->state = DEV_STATE_DOWN;
1718
1719         return rc;
1720 }
1721
1722 /**
1723  * Kernel Thread helper functions for LGW initiated commands
1724  */
1725 static void
1726 lcs_start_kernel_thread(struct work_struct *work)
1727 {
1728         struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1729         LCS_DBF_TEXT(5, trace, "krnthrd");
1730         if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1731                 kernel_thread(lcs_recovery, (void *) card, SIGCHLD);
1732 #ifdef CONFIG_IP_MULTICAST
1733         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1734                 kernel_thread(lcs_register_mc_addresses,
1735                                 (void *) card, SIGCHLD);
1736 #endif
1737 }
1738
1739 /**
1740  * Process control frames.
1741  */
1742 static void
1743 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1744 {
1745         LCS_DBF_TEXT(5, trace, "getctrl");
1746         if (cmd->initiator == LCS_INITIATOR_LGW) {
1747                 switch(cmd->cmd_code) {
1748                 case LCS_CMD_STARTUP:
1749                 case LCS_CMD_STARTLAN:
1750                         lcs_schedule_recovery(card);
1751                         break;
1752                 case LCS_CMD_STOPLAN:
1753                         PRINT_WARN("Stoplan for %s initiated by LGW.\n",
1754                                         card->dev->name);
1755                         if (card->dev)
1756                                 netif_carrier_off(card->dev);
1757                         break;
1758                 default:
1759                         PRINT_INFO("UNRECOGNIZED LGW COMMAND\n");
1760                         break;
1761                 }
1762         } else
1763                 lcs_notify_lancmd_waiters(card, cmd);
1764 }
1765
1766 /**
1767  * Unpack network packet.
1768  */
1769 static void
1770 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1771 {
1772         struct sk_buff *skb;
1773
1774         LCS_DBF_TEXT(5, trace, "getskb");
1775         if (card->dev == NULL ||
1776             card->state != DEV_STATE_UP)
1777                 /* The card isn't up. Ignore the packet. */
1778                 return;
1779
1780         skb = dev_alloc_skb(skb_len);
1781         if (skb == NULL) {
1782                 PRINT_ERR("LCS: alloc_skb failed for device=%s\n",
1783                           card->dev->name);
1784                 card->stats.rx_dropped++;
1785                 return;
1786         }
1787         skb->dev = card->dev;
1788         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1789         skb->protocol = card->lan_type_trans(skb, card->dev);
1790         card->stats.rx_bytes += skb_len;
1791         card->stats.rx_packets++;
1792         *((__u32 *)skb->cb) = ++card->pkt_seq;
1793         netif_rx(skb);
1794 }
1795
1796 /**
1797  * LCS main routine to get packets and lancmd replies from the buffers
1798  */
1799 static void
1800 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1801 {
1802         struct lcs_card *card;
1803         struct lcs_header *lcs_hdr;
1804         __u16 offset;
1805
1806         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1807         lcs_hdr = (struct lcs_header *) buffer->data;
1808         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1809                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1810                 return;
1811         }
1812         card = container_of(channel, struct lcs_card, read);
1813         offset = 0;
1814         while (lcs_hdr->offset != 0) {
1815                 if (lcs_hdr->offset <= 0 ||
1816                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1817                     lcs_hdr->offset < offset) {
1818                         /* Offset invalid. */
1819                         card->stats.rx_length_errors++;
1820                         card->stats.rx_errors++;
1821                         return;
1822                 }
1823                 /* What kind of frame is it? */
1824                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1825                         /* Control frame. */
1826                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1827                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1828                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1829                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1830                         /* Normal network packet. */
1831                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1832                                     lcs_hdr->offset - offset -
1833                                     sizeof(struct lcs_header));
1834                 else
1835                         /* Unknown frame type. */
1836                         ; // FIXME: error message ?
1837                 /* Proceed to next frame. */
1838                 offset = lcs_hdr->offset;
1839                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1840                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1841         }
1842         /* The buffer is now empty. Make it ready again. */
1843         lcs_ready_buffer(&card->read, buffer);
1844 }
1845
1846 /**
1847  * get network statistics for ifconfig and other user programs
1848  */
1849 static struct net_device_stats *
1850 lcs_getstats(struct net_device *dev)
1851 {
1852         struct lcs_card *card;
1853
1854         LCS_DBF_TEXT(4, trace, "netstats");
1855         card = (struct lcs_card *) dev->priv;
1856         return &card->stats;
1857 }
1858
1859 /**
1860  * stop lcs device
1861  * This function will be called by user doing ifconfig xxx down
1862  */
1863 static int
1864 lcs_stop_device(struct net_device *dev)
1865 {
1866         struct lcs_card *card;
1867         int rc;
1868
1869         LCS_DBF_TEXT(2, trace, "stopdev");
1870         card   = (struct lcs_card *) dev->priv;
1871         netif_carrier_off(dev);
1872         netif_tx_disable(dev);
1873         dev->flags &= ~IFF_UP;
1874         wait_event(card->write.wait_q,
1875                 (card->write.state != LCS_CH_STATE_RUNNING));
1876         rc = lcs_stopcard(card);
1877         if (rc)
1878                 PRINT_ERR("Try it again!\n ");
1879         return rc;
1880 }
1881
1882 /**
1883  * start lcs device and make it runnable
1884  * This function will be called by user doing ifconfig xxx up
1885  */
1886 static int
1887 lcs_open_device(struct net_device *dev)
1888 {
1889         struct lcs_card *card;
1890         int rc;
1891
1892         LCS_DBF_TEXT(2, trace, "opendev");
1893         card = (struct lcs_card *) dev->priv;
1894         /* initialize statistics */
1895         rc = lcs_detect(card);
1896         if (rc) {
1897                 PRINT_ERR("LCS:Error in opening device!\n");
1898
1899         } else {
1900                 dev->flags |= IFF_UP;
1901                 netif_carrier_on(dev);
1902                 netif_wake_queue(dev);
1903                 card->state = DEV_STATE_UP;
1904         }
1905         return rc;
1906 }
1907
1908 /**
1909  * show function for portno called by cat or similar things
1910  */
1911 static ssize_t
1912 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1913 {
1914         struct lcs_card *card;
1915
1916         card = (struct lcs_card *)dev->driver_data;
1917
1918         if (!card)
1919                 return 0;
1920
1921         return sprintf(buf, "%d\n", card->portno);
1922 }
1923
1924 /**
1925  * store the value which is piped to file portno
1926  */
1927 static ssize_t
1928 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1929 {
1930         struct lcs_card *card;
1931         int value;
1932
1933         card = (struct lcs_card *)dev->driver_data;
1934
1935         if (!card)
1936                 return 0;
1937
1938         sscanf(buf, "%u", &value);
1939         /* TODO: sanity checks */
1940         card->portno = value;
1941
1942         return count;
1943
1944 }
1945
1946 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1947
1948 static ssize_t
1949 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1950 {
1951         struct ccwgroup_device *cgdev;
1952
1953         cgdev = to_ccwgroupdev(dev);
1954         if (!cgdev)
1955                 return -ENODEV;
1956
1957         return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
1958 }
1959
1960 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1961
1962 static ssize_t
1963 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1964 {
1965         struct lcs_card *card;
1966
1967         card = (struct lcs_card *)dev->driver_data;
1968
1969         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1970 }
1971
1972 static ssize_t
1973 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1974 {
1975         struct lcs_card *card;
1976         int value;
1977
1978         card = (struct lcs_card *)dev->driver_data;
1979
1980         if (!card)
1981                 return 0;
1982
1983         sscanf(buf, "%u", &value);
1984         /* TODO: sanity checks */
1985         card->lancmd_timeout = value;
1986
1987         return count;
1988
1989 }
1990
1991 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
1992
1993 static ssize_t
1994 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
1995                       const char *buf, size_t count)
1996 {
1997         struct lcs_card *card = dev->driver_data;
1998         char *tmp;
1999         int i;
2000
2001         if (!card)
2002                 return -EINVAL;
2003         if (card->state != DEV_STATE_UP)
2004                 return -EPERM;
2005         i = simple_strtoul(buf, &tmp, 16);
2006         if (i == 1)
2007                 lcs_schedule_recovery(card);
2008         return count;
2009 }
2010
2011 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2012
2013 static struct attribute * lcs_attrs[] = {
2014         &dev_attr_portno.attr,
2015         &dev_attr_type.attr,
2016         &dev_attr_lancmd_timeout.attr,
2017         &dev_attr_recover.attr,
2018         NULL,
2019 };
2020
2021 static struct attribute_group lcs_attr_group = {
2022         .attrs = lcs_attrs,
2023 };
2024
2025 /**
2026  * lcs_probe_device is called on establishing a new ccwgroup_device.
2027  */
2028 static int
2029 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2030 {
2031         struct lcs_card *card;
2032         int ret;
2033
2034         if (!get_device(&ccwgdev->dev))
2035                 return -ENODEV;
2036
2037         LCS_DBF_TEXT(2, setup, "add_dev");
2038         card = lcs_alloc_card();
2039         if (!card) {
2040                 PRINT_ERR("Allocation of lcs card failed\n");
2041                 put_device(&ccwgdev->dev);
2042                 return -ENOMEM;
2043         }
2044         ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2045         if (ret) {
2046                 PRINT_ERR("Creating attributes failed");
2047                 lcs_free_card(card);
2048                 put_device(&ccwgdev->dev);
2049                 return ret;
2050         }
2051         ccwgdev->dev.driver_data = card;
2052         ccwgdev->cdev[0]->handler = lcs_irq;
2053         ccwgdev->cdev[1]->handler = lcs_irq;
2054         card->gdev = ccwgdev;
2055         INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2056         card->thread_start_mask = 0;
2057         card->thread_allowed_mask = 0;
2058         card->thread_running_mask = 0;
2059         return 0;
2060 }
2061
2062 static int
2063 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2064 {
2065         struct lcs_card *card;
2066
2067         LCS_DBF_TEXT(2, setup, "regnetdv");
2068         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2069         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2070                 return 0;
2071         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2072         return register_netdev(card->dev);
2073 }
2074
2075 /**
2076  * lcs_new_device will be called by setting the group device online.
2077  */
2078
2079 static int
2080 lcs_new_device(struct ccwgroup_device *ccwgdev)
2081 {
2082         struct  lcs_card *card;
2083         struct net_device *dev=NULL;
2084         enum lcs_dev_states recover_state;
2085         int rc;
2086
2087         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2088         if (!card)
2089                 return -ENODEV;
2090
2091         LCS_DBF_TEXT(2, setup, "newdev");
2092         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2093         card->read.ccwdev  = ccwgdev->cdev[0];
2094         card->write.ccwdev = ccwgdev->cdev[1];
2095
2096         recover_state = card->state;
2097         ccw_device_set_online(card->read.ccwdev);
2098         ccw_device_set_online(card->write.ccwdev);
2099
2100         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2101
2102         lcs_setup_card(card);
2103         rc = lcs_detect(card);
2104         if (rc) {
2105                 LCS_DBF_TEXT(2, setup, "dtctfail");
2106                 PRINT_WARN("Detection of LCS card failed with return code "
2107                            "%d (0x%x)\n", rc, rc);
2108                 lcs_stopcard(card);
2109                 goto out;
2110         }
2111         if (card->dev) {
2112                 LCS_DBF_TEXT(2, setup, "samedev");
2113                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2114                 goto netdev_out;
2115         }
2116         switch (card->lan_type) {
2117 #ifdef CONFIG_NET_ETHERNET
2118         case LCS_FRAME_TYPE_ENET:
2119                 card->lan_type_trans = eth_type_trans;
2120                 dev = alloc_etherdev(0);
2121                 break;
2122 #endif
2123 #ifdef CONFIG_TR
2124         case LCS_FRAME_TYPE_TR:
2125                 card->lan_type_trans = tr_type_trans;
2126                 dev = alloc_trdev(0);
2127                 break;
2128 #endif
2129 #ifdef CONFIG_FDDI
2130         case LCS_FRAME_TYPE_FDDI:
2131                 card->lan_type_trans = fddi_type_trans;
2132                 dev = alloc_fddidev(0);
2133                 break;
2134 #endif
2135         default:
2136                 LCS_DBF_TEXT(3, setup, "errinit");
2137                 PRINT_ERR("LCS: Initialization failed\n");
2138                 PRINT_ERR("LCS: No device found!\n");
2139                 goto out;
2140         }
2141         if (!dev)
2142                 goto out;
2143         card->dev = dev;
2144         card->dev->priv = card;
2145         card->dev->open = lcs_open_device;
2146         card->dev->stop = lcs_stop_device;
2147         card->dev->hard_start_xmit = lcs_start_xmit;
2148         card->dev->get_stats = lcs_getstats;
2149         SET_MODULE_OWNER(dev);
2150         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2151 #ifdef CONFIG_IP_MULTICAST
2152         if (!lcs_check_multicast_support(card))
2153                 card->dev->set_multicast_list = lcs_set_multicast_list;
2154 #endif
2155 netdev_out:
2156         lcs_set_allowed_threads(card,0xffffffff);
2157         if (recover_state == DEV_STATE_RECOVER) {
2158                 lcs_set_multicast_list(card->dev);
2159                 card->dev->flags |= IFF_UP;
2160                 netif_carrier_on(card->dev);
2161                 netif_wake_queue(card->dev);
2162                 card->state = DEV_STATE_UP;
2163         } else {
2164                 lcs_stopcard(card);
2165         }
2166
2167         if (lcs_register_netdev(ccwgdev) != 0)
2168                 goto out;
2169
2170         /* Print out supported assists: IPv6 */
2171         PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
2172                    (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2173                    "with" : "without");
2174         /* Print out supported assist: Multicast */
2175         PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
2176                    (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2177                    "with" : "without");
2178         return 0;
2179 out:
2180
2181         ccw_device_set_offline(card->read.ccwdev);
2182         ccw_device_set_offline(card->write.ccwdev);
2183         return -ENODEV;
2184 }
2185
2186 /**
2187  * lcs_shutdown_device, called when setting the group device offline.
2188  */
2189 static int
2190 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2191 {
2192         struct lcs_card *card;
2193         enum lcs_dev_states recover_state;
2194         int ret;
2195
2196         LCS_DBF_TEXT(3, setup, "shtdndev");
2197         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2198         if (!card)
2199                 return -ENODEV;
2200         if (recovery_mode == 0) {
2201                 lcs_set_allowed_threads(card, 0);
2202                 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2203                         return -ERESTARTSYS;
2204         }
2205         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2206         recover_state = card->state;
2207
2208         ret = lcs_stop_device(card->dev);
2209         ret = ccw_device_set_offline(card->read.ccwdev);
2210         ret = ccw_device_set_offline(card->write.ccwdev);
2211         if (recover_state == DEV_STATE_UP) {
2212                 card->state = DEV_STATE_RECOVER;
2213         }
2214         if (ret)
2215                 return ret;
2216         return 0;
2217 }
2218
2219 static int
2220 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2221 {
2222         return __lcs_shutdown_device(ccwgdev, 0);
2223 }
2224
2225 /**
2226  * drive lcs recovery after startup and startlan initiated by Lan Gateway
2227  */
2228 static int
2229 lcs_recovery(void *ptr)
2230 {
2231         struct lcs_card *card;
2232         struct ccwgroup_device *gdev;
2233         int rc;
2234
2235         card = (struct lcs_card *) ptr;
2236         daemonize("lcs_recover");
2237
2238         LCS_DBF_TEXT(4, trace, "recover1");
2239         if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2240                 return 0;
2241         LCS_DBF_TEXT(4, trace, "recover2");
2242         gdev = card->gdev;
2243         PRINT_WARN("Recovery of device %s started...\n", gdev->dev.bus_id);
2244         rc = __lcs_shutdown_device(gdev, 1);
2245         rc = lcs_new_device(gdev);
2246         if (!rc)
2247                 PRINT_INFO("Device %s successfully recovered!\n",
2248                                 card->dev->name);
2249         else
2250                 PRINT_INFO("Device %s could not be recovered!\n",
2251                                 card->dev->name);
2252         lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2253         return 0;
2254 }
2255
2256 /**
2257  * lcs_remove_device, free buffers and card
2258  */
2259 static void
2260 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2261 {
2262         struct lcs_card *card;
2263
2264         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2265         if (!card)
2266                 return;
2267
2268         PRINT_INFO("Removing lcs group device ....\n");
2269         LCS_DBF_TEXT(3, setup, "remdev");
2270         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2271         if (ccwgdev->state == CCWGROUP_ONLINE) {
2272                 lcs_shutdown_device(ccwgdev);
2273         }
2274         if (card->dev)
2275                 unregister_netdev(card->dev);
2276         sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2277         lcs_cleanup_card(card);
2278         lcs_free_card(card);
2279         put_device(&ccwgdev->dev);
2280 }
2281
2282 /**
2283  * LCS ccwgroup driver registration
2284  */
2285 static struct ccwgroup_driver lcs_group_driver = {
2286         .owner       = THIS_MODULE,
2287         .name        = "lcs",
2288         .max_slaves  = 2,
2289         .driver_id   = 0xD3C3E2,
2290         .probe       = lcs_probe_device,
2291         .remove      = lcs_remove_device,
2292         .set_online  = lcs_new_device,
2293         .set_offline = lcs_shutdown_device,
2294 };
2295
2296 /**
2297  *  LCS Module/Kernel initialization function
2298  */
2299 static int
2300 __init lcs_init_module(void)
2301 {
2302         int rc;
2303
2304         PRINT_INFO("Loading %s\n",version);
2305         rc = lcs_register_debug_facility();
2306         LCS_DBF_TEXT(0, setup, "lcsinit");
2307         if (rc) {
2308                 PRINT_ERR("Initialization failed\n");
2309                 return rc;
2310         }
2311
2312         rc = register_cu3088_discipline(&lcs_group_driver);
2313         if (rc) {
2314                 PRINT_ERR("Initialization failed\n");
2315                 return rc;
2316         }
2317         return 0;
2318 }
2319
2320
2321 /**
2322  *  LCS module cleanup function
2323  */
2324 static void
2325 __exit lcs_cleanup_module(void)
2326 {
2327         PRINT_INFO("Terminating lcs module.\n");
2328         LCS_DBF_TEXT(0, trace, "cleanup");
2329         unregister_cu3088_discipline(&lcs_group_driver);
2330         lcs_unregister_debug_facility();
2331 }
2332
2333 module_init(lcs_init_module);
2334 module_exit(lcs_cleanup_module);
2335
2336 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2337 MODULE_LICENSE("GPL");
2338