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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", 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 = (struct lcs_card *)
1515                 ((char *) channel - offsetof(struct lcs_card, write));
1516         if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1517                 netif_wake_queue(card->dev);
1518         spin_lock(&card->lock);
1519         card->tx_emitted--;
1520         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1521                 /*
1522                  * Last running tx buffer has finished. Submit partially
1523                  * filled current buffer.
1524                  */
1525                 __lcs_emit_txbuffer(card);
1526         spin_unlock(&card->lock);
1527 }
1528
1529 /**
1530  * Packet transmit function called by network stack
1531  */
1532 static int
1533 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1534                  struct net_device *dev)
1535 {
1536         struct lcs_header *header;
1537         int rc = 0;
1538
1539         LCS_DBF_TEXT(5, trace, "hardxmit");
1540         if (skb == NULL) {
1541                 card->stats.tx_dropped++;
1542                 card->stats.tx_errors++;
1543                 return -EIO;
1544         }
1545         if (card->state != DEV_STATE_UP) {
1546                 dev_kfree_skb(skb);
1547                 card->stats.tx_dropped++;
1548                 card->stats.tx_errors++;
1549                 card->stats.tx_carrier_errors++;
1550                 return 0;
1551         }
1552         if (skb->protocol == htons(ETH_P_IPV6)) {
1553                 dev_kfree_skb(skb);
1554                 return 0;
1555         }
1556         netif_stop_queue(card->dev);
1557         spin_lock(&card->lock);
1558         if (card->tx_buffer != NULL &&
1559             card->tx_buffer->count + sizeof(struct lcs_header) +
1560             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1561                 /* skb too big for current tx buffer. */
1562                 __lcs_emit_txbuffer(card);
1563         if (card->tx_buffer == NULL) {
1564                 /* Get new tx buffer */
1565                 card->tx_buffer = lcs_get_buffer(&card->write);
1566                 if (card->tx_buffer == NULL) {
1567                         card->stats.tx_dropped++;
1568                         rc = -EBUSY;
1569                         goto out;
1570                 }
1571                 card->tx_buffer->callback = lcs_txbuffer_cb;
1572                 card->tx_buffer->count = 0;
1573         }
1574         header = (struct lcs_header *)
1575                 (card->tx_buffer->data + card->tx_buffer->count);
1576         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1577         header->offset = card->tx_buffer->count;
1578         header->type = card->lan_type;
1579         header->slot = card->portno;
1580         memcpy(header + 1, skb->data, skb->len);
1581         spin_unlock(&card->lock);
1582         card->stats.tx_bytes += skb->len;
1583         card->stats.tx_packets++;
1584         dev_kfree_skb(skb);
1585         netif_wake_queue(card->dev);
1586         spin_lock(&card->lock);
1587         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1588                 /* If this is the first tx buffer emit it immediately. */
1589                 __lcs_emit_txbuffer(card);
1590 out:
1591         spin_unlock(&card->lock);
1592         return rc;
1593 }
1594
1595 static int
1596 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1597 {
1598         struct lcs_card *card;
1599         int rc;
1600
1601         LCS_DBF_TEXT(5, trace, "pktxmit");
1602         card = (struct lcs_card *) dev->priv;
1603         rc = __lcs_start_xmit(card, skb, dev);
1604         return rc;
1605 }
1606
1607 /**
1608  * send startlan and lanstat command to make LCS device ready
1609  */
1610 static int
1611 lcs_startlan_auto(struct lcs_card *card)
1612 {
1613         int rc;
1614
1615         LCS_DBF_TEXT(2, trace, "strtauto");
1616 #ifdef CONFIG_NET_ETHERNET
1617         card->lan_type = LCS_FRAME_TYPE_ENET;
1618         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1619         if (rc == 0)
1620                 return 0;
1621
1622 #endif
1623 #ifdef CONFIG_TR
1624         card->lan_type = LCS_FRAME_TYPE_TR;
1625         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1626         if (rc == 0)
1627                 return 0;
1628 #endif
1629 #ifdef CONFIG_FDDI
1630         card->lan_type = LCS_FRAME_TYPE_FDDI;
1631         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1632         if (rc == 0)
1633                 return 0;
1634 #endif
1635         return -EIO;
1636 }
1637
1638 static int
1639 lcs_startlan(struct lcs_card *card)
1640 {
1641         int rc, i;
1642
1643         LCS_DBF_TEXT(2, trace, "startlan");
1644         rc = 0;
1645         if (card->portno != LCS_INVALID_PORT_NO) {
1646                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1647                         rc = lcs_startlan_auto(card);
1648                 else
1649                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1650         } else {
1651                 for (i = 0; i <= 16; i++) {
1652                         card->portno = i;
1653                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1654                                 rc = lcs_send_startlan(card,
1655                                                        LCS_INITIATOR_TCPIP);
1656                         else
1657                                 /* autodetecting lan type */
1658                                 rc = lcs_startlan_auto(card);
1659                         if (rc == 0)
1660                                 break;
1661                 }
1662         }
1663         if (rc == 0)
1664                 return lcs_send_lanstat(card);
1665         return rc;
1666 }
1667
1668 /**
1669  * LCS detect function
1670  * setup channels and make them I/O ready
1671  */
1672 static int
1673 lcs_detect(struct lcs_card *card)
1674 {
1675         int rc = 0;
1676
1677         LCS_DBF_TEXT(2, setup, "lcsdetct");
1678         /* start/reset card */
1679         if (card->dev)
1680                 netif_stop_queue(card->dev);
1681         rc = lcs_stop_channels(card);
1682         if (rc == 0) {
1683                 rc = lcs_start_channels(card);
1684                 if (rc == 0) {
1685                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1686                         if (rc == 0)
1687                                 rc = lcs_startlan(card);
1688                 }
1689         }
1690         if (rc == 0) {
1691                 card->state = DEV_STATE_UP;
1692         } else {
1693                 card->state = DEV_STATE_DOWN;
1694                 card->write.state = LCS_CH_STATE_INIT;
1695                 card->read.state =  LCS_CH_STATE_INIT;
1696         }
1697         return rc;
1698 }
1699
1700 /**
1701  * LCS Stop card
1702  */
1703 static int
1704 lcs_stopcard(struct lcs_card *card)
1705 {
1706         int rc;
1707
1708         LCS_DBF_TEXT(3, setup, "stopcard");
1709
1710         if (card->read.state != LCS_CH_STATE_STOPPED &&
1711             card->write.state != LCS_CH_STATE_STOPPED &&
1712             card->state == DEV_STATE_UP) {
1713                 lcs_clear_multicast_list(card);
1714                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1715                 rc = lcs_send_shutdown(card);
1716         }
1717         rc = lcs_stop_channels(card);
1718         card->state = DEV_STATE_DOWN;
1719
1720         return rc;
1721 }
1722
1723 /**
1724  * Kernel Thread helper functions for LGW initiated commands
1725  */
1726 static void
1727 lcs_start_kernel_thread(struct work_struct *work)
1728 {
1729         struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1730         LCS_DBF_TEXT(5, trace, "krnthrd");
1731         if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1732                 kernel_thread(lcs_recovery, (void *) card, SIGCHLD);
1733 #ifdef CONFIG_IP_MULTICAST
1734         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1735                 kernel_thread(lcs_register_mc_addresses,
1736                                 (void *) card, SIGCHLD);
1737 #endif
1738 }
1739
1740 /**
1741  * Process control frames.
1742  */
1743 static void
1744 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1745 {
1746         LCS_DBF_TEXT(5, trace, "getctrl");
1747         if (cmd->initiator == LCS_INITIATOR_LGW) {
1748                 switch(cmd->cmd_code) {
1749                 case LCS_CMD_STARTUP:
1750                 case LCS_CMD_STARTLAN:
1751                         lcs_schedule_recovery(card);
1752                         break;
1753                 case LCS_CMD_STOPLAN:
1754                         PRINT_WARN("Stoplan for %s initiated by LGW.\n",
1755                                         card->dev->name);
1756                         if (card->dev)
1757                                 netif_carrier_off(card->dev);
1758                         break;
1759                 default:
1760                         PRINT_INFO("UNRECOGNIZED LGW COMMAND\n");
1761                         break;
1762                 }
1763         } else
1764                 lcs_notify_lancmd_waiters(card, cmd);
1765 }
1766
1767 /**
1768  * Unpack network packet.
1769  */
1770 static void
1771 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1772 {
1773         struct sk_buff *skb;
1774
1775         LCS_DBF_TEXT(5, trace, "getskb");
1776         if (card->dev == NULL ||
1777             card->state != DEV_STATE_UP)
1778                 /* The card isn't up. Ignore the packet. */
1779                 return;
1780
1781         skb = dev_alloc_skb(skb_len);
1782         if (skb == NULL) {
1783                 PRINT_ERR("LCS: alloc_skb failed for device=%s\n",
1784                           card->dev->name);
1785                 card->stats.rx_dropped++;
1786                 return;
1787         }
1788         skb->dev = card->dev;
1789         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1790         skb->protocol = card->lan_type_trans(skb, card->dev);
1791         card->stats.rx_bytes += skb_len;
1792         card->stats.rx_packets++;
1793         *((__u32 *)skb->cb) = ++card->pkt_seq;
1794         netif_rx(skb);
1795 }
1796
1797 /**
1798  * LCS main routine to get packets and lancmd replies from the buffers
1799  */
1800 static void
1801 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1802 {
1803         struct lcs_card *card;
1804         struct lcs_header *lcs_hdr;
1805         __u16 offset;
1806
1807         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1808         lcs_hdr = (struct lcs_header *) buffer->data;
1809         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1810                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1811                 return;
1812         }
1813         card = (struct lcs_card *)
1814                 ((char *) channel - offsetof(struct lcs_card, read));
1815         offset = 0;
1816         while (lcs_hdr->offset != 0) {
1817                 if (lcs_hdr->offset <= 0 ||
1818                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1819                     lcs_hdr->offset < offset) {
1820                         /* Offset invalid. */
1821                         card->stats.rx_length_errors++;
1822                         card->stats.rx_errors++;
1823                         return;
1824                 }
1825                 /* What kind of frame is it? */
1826                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1827                         /* Control frame. */
1828                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1829                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1830                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1831                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1832                         /* Normal network packet. */
1833                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1834                                     lcs_hdr->offset - offset -
1835                                     sizeof(struct lcs_header));
1836                 else
1837                         /* Unknown frame type. */
1838                         ; // FIXME: error message ?
1839                 /* Proceed to next frame. */
1840                 offset = lcs_hdr->offset;
1841                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1842                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1843         }
1844         /* The buffer is now empty. Make it ready again. */
1845         lcs_ready_buffer(&card->read, buffer);
1846 }
1847
1848 /**
1849  * get network statistics for ifconfig and other user programs
1850  */
1851 static struct net_device_stats *
1852 lcs_getstats(struct net_device *dev)
1853 {
1854         struct lcs_card *card;
1855
1856         LCS_DBF_TEXT(4, trace, "netstats");
1857         card = (struct lcs_card *) dev->priv;
1858         return &card->stats;
1859 }
1860
1861 /**
1862  * stop lcs device
1863  * This function will be called by user doing ifconfig xxx down
1864  */
1865 static int
1866 lcs_stop_device(struct net_device *dev)
1867 {
1868         struct lcs_card *card;
1869         int rc;
1870
1871         LCS_DBF_TEXT(2, trace, "stopdev");
1872         card   = (struct lcs_card *) dev->priv;
1873         netif_carrier_off(dev);
1874         netif_tx_disable(dev);
1875         dev->flags &= ~IFF_UP;
1876         wait_event(card->write.wait_q,
1877                 (card->write.state != LCS_CH_STATE_RUNNING));
1878         rc = lcs_stopcard(card);
1879         if (rc)
1880                 PRINT_ERR("Try it again!\n ");
1881         return rc;
1882 }
1883
1884 /**
1885  * start lcs device and make it runnable
1886  * This function will be called by user doing ifconfig xxx up
1887  */
1888 static int
1889 lcs_open_device(struct net_device *dev)
1890 {
1891         struct lcs_card *card;
1892         int rc;
1893
1894         LCS_DBF_TEXT(2, trace, "opendev");
1895         card = (struct lcs_card *) dev->priv;
1896         /* initialize statistics */
1897         rc = lcs_detect(card);
1898         if (rc) {
1899                 PRINT_ERR("LCS:Error in opening device!\n");
1900
1901         } else {
1902                 dev->flags |= IFF_UP;
1903                 netif_carrier_on(dev);
1904                 netif_wake_queue(dev);
1905                 card->state = DEV_STATE_UP;
1906         }
1907         return rc;
1908 }
1909
1910 /**
1911  * show function for portno called by cat or similar things
1912  */
1913 static ssize_t
1914 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1915 {
1916         struct lcs_card *card;
1917
1918         card = (struct lcs_card *)dev->driver_data;
1919
1920         if (!card)
1921                 return 0;
1922
1923         return sprintf(buf, "%d\n", card->portno);
1924 }
1925
1926 /**
1927  * store the value which is piped to file portno
1928  */
1929 static ssize_t
1930 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1931 {
1932         struct lcs_card *card;
1933         int value;
1934
1935         card = (struct lcs_card *)dev->driver_data;
1936
1937         if (!card)
1938                 return 0;
1939
1940         sscanf(buf, "%u", &value);
1941         /* TODO: sanity checks */
1942         card->portno = value;
1943
1944         return count;
1945
1946 }
1947
1948 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1949
1950 static ssize_t
1951 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1952 {
1953         struct ccwgroup_device *cgdev;
1954
1955         cgdev = to_ccwgroupdev(dev);
1956         if (!cgdev)
1957                 return -ENODEV;
1958
1959         return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
1960 }
1961
1962 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1963
1964 static ssize_t
1965 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1966 {
1967         struct lcs_card *card;
1968
1969         card = (struct lcs_card *)dev->driver_data;
1970
1971         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1972 }
1973
1974 static ssize_t
1975 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1976 {
1977         struct lcs_card *card;
1978         int value;
1979
1980         card = (struct lcs_card *)dev->driver_data;
1981
1982         if (!card)
1983                 return 0;
1984
1985         sscanf(buf, "%u", &value);
1986         /* TODO: sanity checks */
1987         card->lancmd_timeout = value;
1988
1989         return count;
1990
1991 }
1992
1993 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
1994
1995 static ssize_t
1996 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
1997                       const char *buf, size_t count)
1998 {
1999         struct lcs_card *card = dev->driver_data;
2000         char *tmp;
2001         int i;
2002
2003         if (!card)
2004                 return -EINVAL;
2005         if (card->state != DEV_STATE_UP)
2006                 return -EPERM;
2007         i = simple_strtoul(buf, &tmp, 16);
2008         if (i == 1)
2009                 lcs_schedule_recovery(card);
2010         return count;
2011 }
2012
2013 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2014
2015 static struct attribute * lcs_attrs[] = {
2016         &dev_attr_portno.attr,
2017         &dev_attr_type.attr,
2018         &dev_attr_lancmd_timeout.attr,
2019         &dev_attr_recover.attr,
2020         NULL,
2021 };
2022
2023 static struct attribute_group lcs_attr_group = {
2024         .attrs = lcs_attrs,
2025 };
2026
2027 /**
2028  * lcs_probe_device is called on establishing a new ccwgroup_device.
2029  */
2030 static int
2031 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2032 {
2033         struct lcs_card *card;
2034         int ret;
2035
2036         if (!get_device(&ccwgdev->dev))
2037                 return -ENODEV;
2038
2039         LCS_DBF_TEXT(2, setup, "add_dev");
2040         card = lcs_alloc_card();
2041         if (!card) {
2042                 PRINT_ERR("Allocation of lcs card failed\n");
2043                 put_device(&ccwgdev->dev);
2044                 return -ENOMEM;
2045         }
2046         ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2047         if (ret) {
2048                 PRINT_ERR("Creating attributes failed");
2049                 lcs_free_card(card);
2050                 put_device(&ccwgdev->dev);
2051                 return ret;
2052         }
2053         ccwgdev->dev.driver_data = card;
2054         ccwgdev->cdev[0]->handler = lcs_irq;
2055         ccwgdev->cdev[1]->handler = lcs_irq;
2056         card->gdev = ccwgdev;
2057         INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2058         card->thread_start_mask = 0;
2059         card->thread_allowed_mask = 0;
2060         card->thread_running_mask = 0;
2061         return 0;
2062 }
2063
2064 static int
2065 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2066 {
2067         struct lcs_card *card;
2068
2069         LCS_DBF_TEXT(2, setup, "regnetdv");
2070         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2071         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2072                 return 0;
2073         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2074         return register_netdev(card->dev);
2075 }
2076
2077 /**
2078  * lcs_new_device will be called by setting the group device online.
2079  */
2080
2081 static int
2082 lcs_new_device(struct ccwgroup_device *ccwgdev)
2083 {
2084         struct  lcs_card *card;
2085         struct net_device *dev=NULL;
2086         enum lcs_dev_states recover_state;
2087         int rc;
2088
2089         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2090         if (!card)
2091                 return -ENODEV;
2092
2093         LCS_DBF_TEXT(2, setup, "newdev");
2094         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2095         card->read.ccwdev  = ccwgdev->cdev[0];
2096         card->write.ccwdev = ccwgdev->cdev[1];
2097
2098         recover_state = card->state;
2099         ccw_device_set_online(card->read.ccwdev);
2100         ccw_device_set_online(card->write.ccwdev);
2101
2102         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2103
2104         lcs_setup_card(card);
2105         rc = lcs_detect(card);
2106         if (rc) {
2107                 LCS_DBF_TEXT(2, setup, "dtctfail");
2108                 PRINT_WARN("Detection of LCS card failed with return code "
2109                            "%d (0x%x)\n", rc, rc);
2110                 lcs_stopcard(card);
2111                 goto out;
2112         }
2113         if (card->dev) {
2114                 LCS_DBF_TEXT(2, setup, "samedev");
2115                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2116                 goto netdev_out;
2117         }
2118         switch (card->lan_type) {
2119 #ifdef CONFIG_NET_ETHERNET
2120         case LCS_FRAME_TYPE_ENET:
2121                 card->lan_type_trans = eth_type_trans;
2122                 dev = alloc_etherdev(0);
2123                 break;
2124 #endif
2125 #ifdef CONFIG_TR
2126         case LCS_FRAME_TYPE_TR:
2127                 card->lan_type_trans = tr_type_trans;
2128                 dev = alloc_trdev(0);
2129                 break;
2130 #endif
2131 #ifdef CONFIG_FDDI
2132         case LCS_FRAME_TYPE_FDDI:
2133                 card->lan_type_trans = fddi_type_trans;
2134                 dev = alloc_fddidev(0);
2135                 break;
2136 #endif
2137         default:
2138                 LCS_DBF_TEXT(3, setup, "errinit");
2139                 PRINT_ERR("LCS: Initialization failed\n");
2140                 PRINT_ERR("LCS: No device found!\n");
2141                 goto out;
2142         }
2143         if (!dev)
2144                 goto out;
2145         card->dev = dev;
2146         card->dev->priv = card;
2147         card->dev->open = lcs_open_device;
2148         card->dev->stop = lcs_stop_device;
2149         card->dev->hard_start_xmit = lcs_start_xmit;
2150         card->dev->get_stats = lcs_getstats;
2151         SET_MODULE_OWNER(dev);
2152         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2153 #ifdef CONFIG_IP_MULTICAST
2154         if (!lcs_check_multicast_support(card))
2155                 card->dev->set_multicast_list = lcs_set_multicast_list;
2156 #endif
2157 netdev_out:
2158         lcs_set_allowed_threads(card,0xffffffff);
2159         if (recover_state == DEV_STATE_RECOVER) {
2160                 lcs_set_multicast_list(card->dev);
2161                 card->dev->flags |= IFF_UP;
2162                 netif_carrier_on(card->dev);
2163                 netif_wake_queue(card->dev);
2164                 card->state = DEV_STATE_UP;
2165         } else {
2166                 lcs_stopcard(card);
2167         }
2168
2169         if (lcs_register_netdev(ccwgdev) != 0)
2170                 goto out;
2171
2172         /* Print out supported assists: IPv6 */
2173         PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
2174                    (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2175                    "with" : "without");
2176         /* Print out supported assist: Multicast */
2177         PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
2178                    (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2179                    "with" : "without");
2180         return 0;
2181 out:
2182
2183         ccw_device_set_offline(card->read.ccwdev);
2184         ccw_device_set_offline(card->write.ccwdev);
2185         return -ENODEV;
2186 }
2187
2188 /**
2189  * lcs_shutdown_device, called when setting the group device offline.
2190  */
2191 static int
2192 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2193 {
2194         struct lcs_card *card;
2195         enum lcs_dev_states recover_state;
2196         int ret;
2197
2198         LCS_DBF_TEXT(3, setup, "shtdndev");
2199         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2200         if (!card)
2201                 return -ENODEV;
2202         if (recovery_mode == 0) {
2203                 lcs_set_allowed_threads(card, 0);
2204                 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2205                         return -ERESTARTSYS;
2206         }
2207         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2208         recover_state = card->state;
2209
2210         ret = lcs_stop_device(card->dev);
2211         ret = ccw_device_set_offline(card->read.ccwdev);
2212         ret = ccw_device_set_offline(card->write.ccwdev);
2213         if (recover_state == DEV_STATE_UP) {
2214                 card->state = DEV_STATE_RECOVER;
2215         }
2216         if (ret)
2217                 return ret;
2218         return 0;
2219 }
2220
2221 static int
2222 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2223 {
2224         return __lcs_shutdown_device(ccwgdev, 0);
2225 }
2226
2227 /**
2228  * drive lcs recovery after startup and startlan initiated by Lan Gateway
2229  */
2230 static int
2231 lcs_recovery(void *ptr)
2232 {
2233         struct lcs_card *card;
2234         struct ccwgroup_device *gdev;
2235         int rc;
2236
2237         card = (struct lcs_card *) ptr;
2238         daemonize("lcs_recover");
2239
2240         LCS_DBF_TEXT(4, trace, "recover1");
2241         if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2242                 return 0;
2243         LCS_DBF_TEXT(4, trace, "recover2");
2244         gdev = card->gdev;
2245         PRINT_WARN("Recovery of device %s started...\n", gdev->dev.bus_id);
2246         rc = __lcs_shutdown_device(gdev, 1);
2247         rc = lcs_new_device(gdev);
2248         if (!rc)
2249                 PRINT_INFO("Device %s successfully recovered!\n",
2250                                 card->dev->name);
2251         else
2252                 PRINT_INFO("Device %s could not be recovered!\n",
2253                                 card->dev->name);
2254         lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2255         return 0;
2256 }
2257
2258 /**
2259  * lcs_remove_device, free buffers and card
2260  */
2261 static void
2262 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2263 {
2264         struct lcs_card *card;
2265
2266         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2267         if (!card)
2268                 return;
2269
2270         PRINT_INFO("Removing lcs group device ....\n");
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