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   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", 4, 1, 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.cmd.cstat;
1331         dstat = irb->scsw.cmd.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.cmd.cstat;
1392         dstat = irb->scsw.cmd.dstat;
1393         LCS_DBF_TEXT_(5, trace, "Rint%s",cdev->dev.bus_id);
1394         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1395                       irb->scsw.cmd.dstat);
1396         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1397                       irb->scsw.cmd.actl);
1398
1399         /* Check for channel and device errors presented */
1400         rc = lcs_get_problem(cdev, irb);
1401         if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1402                 PRINT_WARN("check on device %s, dstat=0x%X, cstat=0x%X \n",
1403                             cdev->dev.bus_id, dstat, cstat);
1404                 if (rc) {
1405                         channel->state = LCS_CH_STATE_ERROR;
1406                 }
1407         }
1408         if (channel->state == LCS_CH_STATE_ERROR) {
1409                 lcs_schedule_recovery(card);
1410                 wake_up(&card->wait_q);
1411                 return;
1412         }
1413         /* How far in the ccw chain have we processed? */
1414         if ((channel->state != LCS_CH_STATE_INIT) &&
1415             (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC)) {
1416                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1417                         - channel->ccws;
1418                 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1419                     (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1420                         /* Bloody io subsystem tells us lies about cpa... */
1421                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1422                 while (channel->io_idx != index) {
1423                         __lcs_processed_buffer(channel,
1424                                                channel->iob + channel->io_idx);
1425                         channel->io_idx =
1426                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1427                 }
1428         }
1429
1430         if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1431             (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1432             (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1433                 /* Mark channel as stopped. */
1434                 channel->state = LCS_CH_STATE_STOPPED;
1435         else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1436                 /* CCW execution stopped on a suspend bit. */
1437                 channel->state = LCS_CH_STATE_SUSPENDED;
1438         if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1439                 if (irb->scsw.cmd.cc != 0) {
1440                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1441                         return;
1442                 }
1443                 /* The channel has been stopped by halt_IO. */
1444                 channel->state = LCS_CH_STATE_HALTED;
1445         }
1446         if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1447                 channel->state = LCS_CH_STATE_CLEARED;
1448         /* Do the rest in the tasklet. */
1449         tasklet_schedule(&channel->irq_tasklet);
1450 }
1451
1452 /**
1453  * Tasklet for IRQ handler
1454  */
1455 static void
1456 lcs_tasklet(unsigned long data)
1457 {
1458         unsigned long flags;
1459         struct lcs_channel *channel;
1460         struct lcs_buffer *iob;
1461         int buf_idx;
1462         int rc;
1463
1464         channel = (struct lcs_channel *) data;
1465         LCS_DBF_TEXT_(5, trace, "tlet%s",channel->ccwdev->dev.bus_id);
1466
1467         /* Check for processed buffers. */
1468         iob = channel->iob;
1469         buf_idx = channel->buf_idx;
1470         while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1471                 /* Do the callback thing. */
1472                 if (iob[buf_idx].callback != NULL)
1473                         iob[buf_idx].callback(channel, iob + buf_idx);
1474                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1475         }
1476         channel->buf_idx = buf_idx;
1477
1478         if (channel->state == LCS_CH_STATE_STOPPED)
1479                 // FIXME: what if rc != 0 ??
1480                 rc = lcs_start_channel(channel);
1481         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1482         if (channel->state == LCS_CH_STATE_SUSPENDED &&
1483             channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) {
1484                 // FIXME: what if rc != 0 ??
1485                 rc = __lcs_resume_channel(channel);
1486         }
1487         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1488
1489         /* Something happened on the channel. Wake up waiters. */
1490         wake_up(&channel->wait_q);
1491 }
1492
1493 /**
1494  * Finish current tx buffer and make it ready for transmit.
1495  */
1496 static void
1497 __lcs_emit_txbuffer(struct lcs_card *card)
1498 {
1499         LCS_DBF_TEXT(5, trace, "emittx");
1500         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1501         card->tx_buffer->count += 2;
1502         lcs_ready_buffer(&card->write, card->tx_buffer);
1503         card->tx_buffer = NULL;
1504         card->tx_emitted++;
1505 }
1506
1507 /**
1508  * Callback for finished tx buffers.
1509  */
1510 static void
1511 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1512 {
1513         struct lcs_card *card;
1514
1515         LCS_DBF_TEXT(5, trace, "txbuffcb");
1516         /* Put buffer back to pool. */
1517         lcs_release_buffer(channel, buffer);
1518         card = container_of(channel, struct lcs_card, write);
1519         if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1520                 netif_wake_queue(card->dev);
1521         spin_lock(&card->lock);
1522         card->tx_emitted--;
1523         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1524                 /*
1525                  * Last running tx buffer has finished. Submit partially
1526                  * filled current buffer.
1527                  */
1528                 __lcs_emit_txbuffer(card);
1529         spin_unlock(&card->lock);
1530 }
1531
1532 /**
1533  * Packet transmit function called by network stack
1534  */
1535 static int
1536 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1537                  struct net_device *dev)
1538 {
1539         struct lcs_header *header;
1540         int rc = 0;
1541
1542         LCS_DBF_TEXT(5, trace, "hardxmit");
1543         if (skb == NULL) {
1544                 card->stats.tx_dropped++;
1545                 card->stats.tx_errors++;
1546                 return -EIO;
1547         }
1548         if (card->state != DEV_STATE_UP) {
1549                 dev_kfree_skb(skb);
1550                 card->stats.tx_dropped++;
1551                 card->stats.tx_errors++;
1552                 card->stats.tx_carrier_errors++;
1553                 return 0;
1554         }
1555         if (skb->protocol == htons(ETH_P_IPV6)) {
1556                 dev_kfree_skb(skb);
1557                 return 0;
1558         }
1559         netif_stop_queue(card->dev);
1560         spin_lock(&card->lock);
1561         if (card->tx_buffer != NULL &&
1562             card->tx_buffer->count + sizeof(struct lcs_header) +
1563             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1564                 /* skb too big for current tx buffer. */
1565                 __lcs_emit_txbuffer(card);
1566         if (card->tx_buffer == NULL) {
1567                 /* Get new tx buffer */
1568                 card->tx_buffer = lcs_get_buffer(&card->write);
1569                 if (card->tx_buffer == NULL) {
1570                         card->stats.tx_dropped++;
1571                         rc = -EBUSY;
1572                         goto out;
1573                 }
1574                 card->tx_buffer->callback = lcs_txbuffer_cb;
1575                 card->tx_buffer->count = 0;
1576         }
1577         header = (struct lcs_header *)
1578                 (card->tx_buffer->data + card->tx_buffer->count);
1579         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1580         header->offset = card->tx_buffer->count;
1581         header->type = card->lan_type;
1582         header->slot = card->portno;
1583         skb_copy_from_linear_data(skb, header + 1, skb->len);
1584         spin_unlock(&card->lock);
1585         card->stats.tx_bytes += skb->len;
1586         card->stats.tx_packets++;
1587         dev_kfree_skb(skb);
1588         netif_wake_queue(card->dev);
1589         spin_lock(&card->lock);
1590         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1591                 /* If this is the first tx buffer emit it immediately. */
1592                 __lcs_emit_txbuffer(card);
1593 out:
1594         spin_unlock(&card->lock);
1595         return rc;
1596 }
1597
1598 static int
1599 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1600 {
1601         struct lcs_card *card;
1602         int rc;
1603
1604         LCS_DBF_TEXT(5, trace, "pktxmit");
1605         card = (struct lcs_card *) dev->priv;
1606         rc = __lcs_start_xmit(card, skb, dev);
1607         return rc;
1608 }
1609
1610 /**
1611  * send startlan and lanstat command to make LCS device ready
1612  */
1613 static int
1614 lcs_startlan_auto(struct lcs_card *card)
1615 {
1616         int rc;
1617
1618         LCS_DBF_TEXT(2, trace, "strtauto");
1619 #ifdef CONFIG_NET_ETHERNET
1620         card->lan_type = LCS_FRAME_TYPE_ENET;
1621         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1622         if (rc == 0)
1623                 return 0;
1624
1625 #endif
1626 #ifdef CONFIG_TR
1627         card->lan_type = LCS_FRAME_TYPE_TR;
1628         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1629         if (rc == 0)
1630                 return 0;
1631 #endif
1632 #ifdef CONFIG_FDDI
1633         card->lan_type = LCS_FRAME_TYPE_FDDI;
1634         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1635         if (rc == 0)
1636                 return 0;
1637 #endif
1638         return -EIO;
1639 }
1640
1641 static int
1642 lcs_startlan(struct lcs_card *card)
1643 {
1644         int rc, i;
1645
1646         LCS_DBF_TEXT(2, trace, "startlan");
1647         rc = 0;
1648         if (card->portno != LCS_INVALID_PORT_NO) {
1649                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1650                         rc = lcs_startlan_auto(card);
1651                 else
1652                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1653         } else {
1654                 for (i = 0; i <= 16; i++) {
1655                         card->portno = i;
1656                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1657                                 rc = lcs_send_startlan(card,
1658                                                        LCS_INITIATOR_TCPIP);
1659                         else
1660                                 /* autodetecting lan type */
1661                                 rc = lcs_startlan_auto(card);
1662                         if (rc == 0)
1663                                 break;
1664                 }
1665         }
1666         if (rc == 0)
1667                 return lcs_send_lanstat(card);
1668         return rc;
1669 }
1670
1671 /**
1672  * LCS detect function
1673  * setup channels and make them I/O ready
1674  */
1675 static int
1676 lcs_detect(struct lcs_card *card)
1677 {
1678         int rc = 0;
1679
1680         LCS_DBF_TEXT(2, setup, "lcsdetct");
1681         /* start/reset card */
1682         if (card->dev)
1683                 netif_stop_queue(card->dev);
1684         rc = lcs_stop_channels(card);
1685         if (rc == 0) {
1686                 rc = lcs_start_channels(card);
1687                 if (rc == 0) {
1688                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1689                         if (rc == 0)
1690                                 rc = lcs_startlan(card);
1691                 }
1692         }
1693         if (rc == 0) {
1694                 card->state = DEV_STATE_UP;
1695         } else {
1696                 card->state = DEV_STATE_DOWN;
1697                 card->write.state = LCS_CH_STATE_INIT;
1698                 card->read.state =  LCS_CH_STATE_INIT;
1699         }
1700         return rc;
1701 }
1702
1703 /**
1704  * LCS Stop card
1705  */
1706 static int
1707 lcs_stopcard(struct lcs_card *card)
1708 {
1709         int rc;
1710
1711         LCS_DBF_TEXT(3, setup, "stopcard");
1712
1713         if (card->read.state != LCS_CH_STATE_STOPPED &&
1714             card->write.state != LCS_CH_STATE_STOPPED &&
1715             card->read.state != LCS_CH_STATE_ERROR &&
1716             card->write.state != LCS_CH_STATE_ERROR &&
1717             card->state == DEV_STATE_UP) {
1718                 lcs_clear_multicast_list(card);
1719                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1720                 rc = lcs_send_shutdown(card);
1721         }
1722         rc = lcs_stop_channels(card);
1723         card->state = DEV_STATE_DOWN;
1724
1725         return rc;
1726 }
1727
1728 /**
1729  * Kernel Thread helper functions for LGW initiated commands
1730  */
1731 static void
1732 lcs_start_kernel_thread(struct work_struct *work)
1733 {
1734         struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1735         LCS_DBF_TEXT(5, trace, "krnthrd");
1736         if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1737                 kernel_thread(lcs_recovery, (void *) card, SIGCHLD);
1738 #ifdef CONFIG_IP_MULTICAST
1739         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1740                 kernel_thread(lcs_register_mc_addresses,
1741                                 (void *) card, SIGCHLD);
1742 #endif
1743 }
1744
1745 /**
1746  * Process control frames.
1747  */
1748 static void
1749 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1750 {
1751         LCS_DBF_TEXT(5, trace, "getctrl");
1752         if (cmd->initiator == LCS_INITIATOR_LGW) {
1753                 switch(cmd->cmd_code) {
1754                 case LCS_CMD_STARTUP:
1755                 case LCS_CMD_STARTLAN:
1756                         lcs_schedule_recovery(card);
1757                         break;
1758                 case LCS_CMD_STOPLAN:
1759                         PRINT_WARN("Stoplan for %s initiated by LGW.\n",
1760                                         card->dev->name);
1761                         if (card->dev)
1762                                 netif_carrier_off(card->dev);
1763                         break;
1764                 default:
1765                         LCS_DBF_TEXT(5, trace, "noLGWcmd");
1766                         break;
1767                 }
1768         } else
1769                 lcs_notify_lancmd_waiters(card, cmd);
1770 }
1771
1772 /**
1773  * Unpack network packet.
1774  */
1775 static void
1776 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1777 {
1778         struct sk_buff *skb;
1779
1780         LCS_DBF_TEXT(5, trace, "getskb");
1781         if (card->dev == NULL ||
1782             card->state != DEV_STATE_UP)
1783                 /* The card isn't up. Ignore the packet. */
1784                 return;
1785
1786         skb = dev_alloc_skb(skb_len);
1787         if (skb == NULL) {
1788                 PRINT_ERR("LCS: alloc_skb failed for device=%s\n",
1789                           card->dev->name);
1790                 card->stats.rx_dropped++;
1791                 return;
1792         }
1793         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1794         skb->protocol = card->lan_type_trans(skb, card->dev);
1795         card->stats.rx_bytes += skb_len;
1796         card->stats.rx_packets++;
1797         if (skb->protocol == htons(ETH_P_802_2))
1798                 *((__u32 *)skb->cb) = ++card->pkt_seq;
1799         netif_rx(skb);
1800 }
1801
1802 /**
1803  * LCS main routine to get packets and lancmd replies from the buffers
1804  */
1805 static void
1806 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1807 {
1808         struct lcs_card *card;
1809         struct lcs_header *lcs_hdr;
1810         __u16 offset;
1811
1812         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1813         lcs_hdr = (struct lcs_header *) buffer->data;
1814         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1815                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1816                 return;
1817         }
1818         card = container_of(channel, struct lcs_card, read);
1819         offset = 0;
1820         while (lcs_hdr->offset != 0) {
1821                 if (lcs_hdr->offset <= 0 ||
1822                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1823                     lcs_hdr->offset < offset) {
1824                         /* Offset invalid. */
1825                         card->stats.rx_length_errors++;
1826                         card->stats.rx_errors++;
1827                         return;
1828                 }
1829                 /* What kind of frame is it? */
1830                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1831                         /* Control frame. */
1832                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1833                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1834                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1835                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1836                         /* Normal network packet. */
1837                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1838                                     lcs_hdr->offset - offset -
1839                                     sizeof(struct lcs_header));
1840                 else
1841                         /* Unknown frame type. */
1842                         ; // FIXME: error message ?
1843                 /* Proceed to next frame. */
1844                 offset = lcs_hdr->offset;
1845                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1846                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1847         }
1848         /* The buffer is now empty. Make it ready again. */
1849         lcs_ready_buffer(&card->read, buffer);
1850 }
1851
1852 /**
1853  * get network statistics for ifconfig and other user programs
1854  */
1855 static struct net_device_stats *
1856 lcs_getstats(struct net_device *dev)
1857 {
1858         struct lcs_card *card;
1859
1860         LCS_DBF_TEXT(4, trace, "netstats");
1861         card = (struct lcs_card *) dev->priv;
1862         return &card->stats;
1863 }
1864
1865 /**
1866  * stop lcs device
1867  * This function will be called by user doing ifconfig xxx down
1868  */
1869 static int
1870 lcs_stop_device(struct net_device *dev)
1871 {
1872         struct lcs_card *card;
1873         int rc;
1874
1875         LCS_DBF_TEXT(2, trace, "stopdev");
1876         card   = (struct lcs_card *) dev->priv;
1877         netif_carrier_off(dev);
1878         netif_tx_disable(dev);
1879         dev->flags &= ~IFF_UP;
1880         wait_event(card->write.wait_q,
1881                 (card->write.state != LCS_CH_STATE_RUNNING));
1882         rc = lcs_stopcard(card);
1883         if (rc)
1884                 PRINT_ERR("Try it again!\n ");
1885         return rc;
1886 }
1887
1888 /**
1889  * start lcs device and make it runnable
1890  * This function will be called by user doing ifconfig xxx up
1891  */
1892 static int
1893 lcs_open_device(struct net_device *dev)
1894 {
1895         struct lcs_card *card;
1896         int rc;
1897
1898         LCS_DBF_TEXT(2, trace, "opendev");
1899         card = (struct lcs_card *) dev->priv;
1900         /* initialize statistics */
1901         rc = lcs_detect(card);
1902         if (rc) {
1903                 PRINT_ERR("LCS:Error in opening device!\n");
1904
1905         } else {
1906                 dev->flags |= IFF_UP;
1907                 netif_carrier_on(dev);
1908                 netif_wake_queue(dev);
1909                 card->state = DEV_STATE_UP;
1910         }
1911         return rc;
1912 }
1913
1914 /**
1915  * show function for portno called by cat or similar things
1916  */
1917 static ssize_t
1918 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1919 {
1920         struct lcs_card *card;
1921
1922         card = (struct lcs_card *)dev->driver_data;
1923
1924         if (!card)
1925                 return 0;
1926
1927         return sprintf(buf, "%d\n", card->portno);
1928 }
1929
1930 /**
1931  * store the value which is piped to file portno
1932  */
1933 static ssize_t
1934 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1935 {
1936         struct lcs_card *card;
1937         int value;
1938
1939         card = (struct lcs_card *)dev->driver_data;
1940
1941         if (!card)
1942                 return 0;
1943
1944         sscanf(buf, "%u", &value);
1945         /* TODO: sanity checks */
1946         card->portno = value;
1947
1948         return count;
1949
1950 }
1951
1952 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1953
1954 static ssize_t
1955 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1956 {
1957         struct ccwgroup_device *cgdev;
1958
1959         cgdev = to_ccwgroupdev(dev);
1960         if (!cgdev)
1961                 return -ENODEV;
1962
1963         return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
1964 }
1965
1966 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1967
1968 static ssize_t
1969 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1970 {
1971         struct lcs_card *card;
1972
1973         card = (struct lcs_card *)dev->driver_data;
1974
1975         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1976 }
1977
1978 static ssize_t
1979 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1980 {
1981         struct lcs_card *card;
1982         int value;
1983
1984         card = (struct lcs_card *)dev->driver_data;
1985
1986         if (!card)
1987                 return 0;
1988
1989         sscanf(buf, "%u", &value);
1990         /* TODO: sanity checks */
1991         card->lancmd_timeout = value;
1992
1993         return count;
1994
1995 }
1996
1997 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
1998
1999 static ssize_t
2000 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2001                       const char *buf, size_t count)
2002 {
2003         struct lcs_card *card = dev->driver_data;
2004         char *tmp;
2005         int i;
2006
2007         if (!card)
2008                 return -EINVAL;
2009         if (card->state != DEV_STATE_UP)
2010                 return -EPERM;
2011         i = simple_strtoul(buf, &tmp, 16);
2012         if (i == 1)
2013                 lcs_schedule_recovery(card);
2014         return count;
2015 }
2016
2017 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2018
2019 static struct attribute * lcs_attrs[] = {
2020         &dev_attr_portno.attr,
2021         &dev_attr_type.attr,
2022         &dev_attr_lancmd_timeout.attr,
2023         &dev_attr_recover.attr,
2024         NULL,
2025 };
2026
2027 static struct attribute_group lcs_attr_group = {
2028         .attrs = lcs_attrs,
2029 };
2030
2031 /**
2032  * lcs_probe_device is called on establishing a new ccwgroup_device.
2033  */
2034 static int
2035 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2036 {
2037         struct lcs_card *card;
2038         int ret;
2039
2040         if (!get_device(&ccwgdev->dev))
2041                 return -ENODEV;
2042
2043         LCS_DBF_TEXT(2, setup, "add_dev");
2044         card = lcs_alloc_card();
2045         if (!card) {
2046                 LCS_DBF_TEXT_(2, setup, "  rc%d", -ENOMEM);
2047                 put_device(&ccwgdev->dev);
2048                 return -ENOMEM;
2049         }
2050         ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2051         if (ret) {
2052                 lcs_free_card(card);
2053                 put_device(&ccwgdev->dev);
2054                 return ret;
2055         }
2056         ccwgdev->dev.driver_data = card;
2057         ccwgdev->cdev[0]->handler = lcs_irq;
2058         ccwgdev->cdev[1]->handler = lcs_irq;
2059         card->gdev = ccwgdev;
2060         INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2061         card->thread_start_mask = 0;
2062         card->thread_allowed_mask = 0;
2063         card->thread_running_mask = 0;
2064         return 0;
2065 }
2066
2067 static int
2068 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2069 {
2070         struct lcs_card *card;
2071
2072         LCS_DBF_TEXT(2, setup, "regnetdv");
2073         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2074         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2075                 return 0;
2076         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2077         return register_netdev(card->dev);
2078 }
2079
2080 /**
2081  * lcs_new_device will be called by setting the group device online.
2082  */
2083
2084 static int
2085 lcs_new_device(struct ccwgroup_device *ccwgdev)
2086 {
2087         struct  lcs_card *card;
2088         struct net_device *dev=NULL;
2089         enum lcs_dev_states recover_state;
2090         int rc;
2091
2092         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2093         if (!card)
2094                 return -ENODEV;
2095
2096         LCS_DBF_TEXT(2, setup, "newdev");
2097         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2098         card->read.ccwdev  = ccwgdev->cdev[0];
2099         card->write.ccwdev = ccwgdev->cdev[1];
2100
2101         recover_state = card->state;
2102         ccw_device_set_online(card->read.ccwdev);
2103         ccw_device_set_online(card->write.ccwdev);
2104
2105         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2106
2107         lcs_setup_card(card);
2108         rc = lcs_detect(card);
2109         if (rc) {
2110                 LCS_DBF_TEXT(2, setup, "dtctfail");
2111                 PRINT_WARN("Detection of LCS card failed with return code "
2112                            "%d (0x%x)\n", rc, rc);
2113                 lcs_stopcard(card);
2114                 goto out;
2115         }
2116         if (card->dev) {
2117                 LCS_DBF_TEXT(2, setup, "samedev");
2118                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2119                 goto netdev_out;
2120         }
2121         switch (card->lan_type) {
2122 #ifdef CONFIG_NET_ETHERNET
2123         case LCS_FRAME_TYPE_ENET:
2124                 card->lan_type_trans = eth_type_trans;
2125                 dev = alloc_etherdev(0);
2126                 break;
2127 #endif
2128 #ifdef CONFIG_TR
2129         case LCS_FRAME_TYPE_TR:
2130                 card->lan_type_trans = tr_type_trans;
2131                 dev = alloc_trdev(0);
2132                 break;
2133 #endif
2134 #ifdef CONFIG_FDDI
2135         case LCS_FRAME_TYPE_FDDI:
2136                 card->lan_type_trans = fddi_type_trans;
2137                 dev = alloc_fddidev(0);
2138                 break;
2139 #endif
2140         default:
2141                 LCS_DBF_TEXT(3, setup, "errinit");
2142                 PRINT_ERR("LCS: Initialization failed\n");
2143                 goto out;
2144         }
2145         if (!dev)
2146                 goto out;
2147         card->dev = dev;
2148         card->dev->priv = card;
2149         card->dev->open = lcs_open_device;
2150         card->dev->stop = lcs_stop_device;
2151         card->dev->hard_start_xmit = lcs_start_xmit;
2152         card->dev->get_stats = lcs_getstats;
2153         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2154 #ifdef CONFIG_IP_MULTICAST
2155         if (!lcs_check_multicast_support(card))
2156                 card->dev->set_multicast_list = lcs_set_multicast_list;
2157 #endif
2158 netdev_out:
2159         lcs_set_allowed_threads(card,0xffffffff);
2160         if (recover_state == DEV_STATE_RECOVER) {
2161                 lcs_set_multicast_list(card->dev);
2162                 card->dev->flags |= IFF_UP;
2163                 netif_carrier_on(card->dev);
2164                 netif_wake_queue(card->dev);
2165                 card->state = DEV_STATE_UP;
2166         } else {
2167                 lcs_stopcard(card);
2168         }
2169
2170         if (lcs_register_netdev(ccwgdev) != 0)
2171                 goto out;
2172
2173         /* Print out supported assists: IPv6 */
2174         PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
2175                    (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2176                    "with" : "without");
2177         /* Print out supported assist: Multicast */
2178         PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
2179                    (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2180                    "with" : "without");
2181         return 0;
2182 out:
2183
2184         ccw_device_set_offline(card->read.ccwdev);
2185         ccw_device_set_offline(card->write.ccwdev);
2186         return -ENODEV;
2187 }
2188
2189 /**
2190  * lcs_shutdown_device, called when setting the group device offline.
2191  */
2192 static int
2193 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2194 {
2195         struct lcs_card *card;
2196         enum lcs_dev_states recover_state;
2197         int ret;
2198
2199         LCS_DBF_TEXT(3, setup, "shtdndev");
2200         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2201         if (!card)
2202                 return -ENODEV;
2203         if (recovery_mode == 0) {
2204                 lcs_set_allowed_threads(card, 0);
2205                 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2206                         return -ERESTARTSYS;
2207         }
2208         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2209         recover_state = card->state;
2210
2211         ret = lcs_stop_device(card->dev);
2212         ret = ccw_device_set_offline(card->read.ccwdev);
2213         ret = ccw_device_set_offline(card->write.ccwdev);
2214         if (recover_state == DEV_STATE_UP) {
2215                 card->state = DEV_STATE_RECOVER;
2216         }
2217         if (ret)
2218                 return ret;
2219         return 0;
2220 }
2221
2222 static int
2223 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2224 {
2225         return __lcs_shutdown_device(ccwgdev, 0);
2226 }
2227
2228 /**
2229  * drive lcs recovery after startup and startlan initiated by Lan Gateway
2230  */
2231 static int
2232 lcs_recovery(void *ptr)
2233 {
2234         struct lcs_card *card;
2235         struct ccwgroup_device *gdev;
2236         int rc;
2237
2238         card = (struct lcs_card *) ptr;
2239         daemonize("lcs_recover");
2240
2241         LCS_DBF_TEXT(4, trace, "recover1");
2242         if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2243                 return 0;
2244         LCS_DBF_TEXT(4, trace, "recover2");
2245         gdev = card->gdev;
2246         PRINT_WARN("Recovery of device %s started...\n", gdev->dev.bus_id);
2247         rc = __lcs_shutdown_device(gdev, 1);
2248         rc = lcs_new_device(gdev);
2249         if (!rc)
2250                 PRINT_INFO("Device %s successfully recovered!\n",
2251                                 card->dev->name);
2252         else
2253                 PRINT_INFO("Device %s could not be recovered!\n",
2254                                 card->dev->name);
2255         lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2256         return 0;
2257 }
2258
2259 /**
2260  * lcs_remove_device, free buffers and card
2261  */
2262 static void
2263 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2264 {
2265         struct lcs_card *card;
2266
2267         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2268         if (!card)
2269                 return;
2270
2271         LCS_DBF_TEXT(3, setup, "remdev");
2272         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2273         if (ccwgdev->state == CCWGROUP_ONLINE) {
2274                 lcs_shutdown_device(ccwgdev);
2275         }
2276         if (card->dev)
2277                 unregister_netdev(card->dev);
2278         sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2279         lcs_cleanup_card(card);
2280         lcs_free_card(card);
2281         put_device(&ccwgdev->dev);
2282 }
2283
2284 /**
2285  * LCS ccwgroup driver registration
2286  */
2287 static struct ccwgroup_driver lcs_group_driver = {
2288         .owner       = THIS_MODULE,
2289         .name        = "lcs",
2290         .max_slaves  = 2,
2291         .driver_id   = 0xD3C3E2,
2292         .probe       = lcs_probe_device,
2293         .remove      = lcs_remove_device,
2294         .set_online  = lcs_new_device,
2295         .set_offline = lcs_shutdown_device,
2296 };
2297
2298 /**
2299  *  LCS Module/Kernel initialization function
2300  */
2301 static int
2302 __init lcs_init_module(void)
2303 {
2304         int rc;
2305
2306         PRINT_INFO("Loading %s\n",version);
2307         rc = lcs_register_debug_facility();
2308         LCS_DBF_TEXT(0, setup, "lcsinit");
2309         if (rc) {
2310                 PRINT_ERR("Initialization failed\n");
2311                 return rc;
2312         }
2313
2314         rc = register_cu3088_discipline(&lcs_group_driver);
2315         if (rc) {
2316                 PRINT_ERR("Initialization failed\n");
2317                 return rc;
2318         }
2319         return 0;
2320 }
2321
2322
2323 /**
2324  *  LCS module cleanup function
2325  */
2326 static void
2327 __exit lcs_cleanup_module(void)
2328 {
2329         PRINT_INFO("Terminating lcs module.\n");
2330         LCS_DBF_TEXT(0, trace, "cleanup");
2331         unregister_cu3088_discipline(&lcs_group_driver);
2332         lcs_unregister_debug_facility();
2333 }
2334
2335 module_init(lcs_init_module);
2336 module_exit(lcs_cleanup_module);
2337
2338 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2339 MODULE_LICENSE("GPL");
2340