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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 (pavlic@de.ibm.com) and
  12  *                        Martin Schwidefsky <schwidefsky@de.ibm.com>
  13  *
  14  *    $Revision: 1.98 $  $Date: 2005/04/18 13:41:29 $
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2, or (at your option)
  19  * any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29  */
  30
  31 #include <linux/module.h>
  32 #include <linux/if.h>
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/trdevice.h>
  36 #include <linux/fddidevice.h>
  37 #include <linux/inetdevice.h>
  38 #include <linux/in.h>
  39 #include <linux/igmp.h>
  40 #include <linux/delay.h>
  41 #include <net/arp.h>
  42 #include <net/ip.h>
  43
  44 #include <asm/debug.h>
  45 #include <asm/idals.h>
  46 #include <asm/timex.h>
  47 #include <linux/device.h>
  48 #include <asm/ccwgroup.h>
  49
  50 #include "lcs.h"
  51 #include "cu3088.h"
  52
  53
  54 #if !defined(CONFIG_NET_ETHERNET) && \
  55     !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
  56 #error Cannot compile lcs.c without some net devices switched on.
  57 #endif
  58
  59 /**
  60  * initialization string for output
  61  */
  62 #define VERSION_LCS_C  "$Revision: 1.98 $"
  63
  64 static char version[] __initdata = "LCS driver ("VERSION_LCS_C "/" VERSION_LCS_H ")";
  65 static char debug_buffer[255];
  66
  67 /**
  68  * Some prototypes.
  69  */
  70 static void lcs_tasklet(unsigned long);
  71 static void lcs_start_kernel_thread(struct lcs_card *card);
  72 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
  73 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
  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", 1, 1, 8);
  97         lcs_dbf_trace = debug_register("lcs_trace", 1, 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, 4);
 105         debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
 106         debug_set_level(lcs_dbf_trace, 4);
 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 = (void *)
 122                         kmalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
 123                 if (channel->iob[cnt].data == NULL)
 124                         break;
 125                 memset(channel->iob[cnt].data, 0, LCS_IOBUFFERSIZE);
 126                 channel->iob[cnt].state = BUF_STATE_EMPTY;
 127         }
 128         if (cnt < LCS_NUM_BUFFS) {
 129                 /* Not all io buffers could be allocated. */
 130                 LCS_DBF_TEXT(2, setup, "echalloc");
 131                 while (cnt-- > 0)
 132                         kfree(channel->iob[cnt].data);
 133                 return -ENOMEM;
 134         }
 135         return 0;
 136 }
 137
 138 /**
 139  * Free io buffers.
 140  */
 141 static void
 142 lcs_free_channel(struct lcs_channel *channel)
 143 {
 144         int cnt;
 145
 146         LCS_DBF_TEXT(2, setup, "ichfree");
 147         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 148                 if (channel->iob[cnt].data != NULL)
 149                         kfree(channel->iob[cnt].data);
 150                 channel->iob[cnt].data = NULL;
 151         }
 152 }
 153
 154 /*
 155  * Cleanup channel.
 156  */
 157 static void
 158 lcs_cleanup_channel(struct lcs_channel *channel)
 159 {
 160         LCS_DBF_TEXT(3, setup, "cleanch");
 161         /* Kill write channel tasklets. */
 162         tasklet_kill(&channel->irq_tasklet);
 163         /* Free channel buffers. */
 164         lcs_free_channel(channel);
 165 }
 166
 167 /**
 168  * LCS free memory for card and channels.
 169  */
 170 static void
 171 lcs_free_card(struct lcs_card *card)
 172 {
 173         LCS_DBF_TEXT(2, setup, "remcard");
 174         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 175         kfree(card);
 176 }
 177
 178 /**
 179  * LCS alloc memory for card and channels
 180  */
 181 static struct lcs_card *
 182 lcs_alloc_card(void)
 183 {
 184         struct lcs_card *card;
 185         int rc;
 186
 187         LCS_DBF_TEXT(2, setup, "alloclcs");
 188
 189         card = kmalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
 190         if (card == NULL)
 191                 return NULL;
 192         memset(card, 0, sizeof(struct lcs_card));
 193         card->lan_type = LCS_FRAME_TYPE_AUTO;
 194         card->pkt_seq = 0;
 195         card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
 196         /* Allocate io buffers for the read channel. */
 197         rc = lcs_alloc_channel(&card->read);
 198         if (rc){
 199                 LCS_DBF_TEXT(2, setup, "iccwerr");
 200                 lcs_free_card(card);
 201                 return NULL;
 202         }
 203         /* Allocate io buffers for the write channel. */
 204         rc = lcs_alloc_channel(&card->write);
 205         if (rc) {
 206                 LCS_DBF_TEXT(2, setup, "iccwerr");
 207                 lcs_cleanup_channel(&card->read);
 208                 lcs_free_card(card);
 209                 return NULL;
 210         }
 211
 212 #ifdef CONFIG_IP_MULTICAST
 213         INIT_LIST_HEAD(&card->ipm_list);
 214 #endif
 215         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 216         return card;
 217 }
 218
 219 /*
 220  * Setup read channel.
 221  */
 222 static void
 223 lcs_setup_read_ccws(struct lcs_card *card)
 224 {
 225         int cnt;
 226
 227         LCS_DBF_TEXT(2, setup, "ireadccw");
 228         /* Setup read ccws. */
 229         memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
 230         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 231                 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
 232                 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
 233                 card->read.ccws[cnt].flags =
 234                         CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
 235                 /*
 236                  * Note: we have allocated the buffer with GFP_DMA, so
 237                  * we do not need to do set_normalized_cda.
 238                  */
 239                 card->read.ccws[cnt].cda =
 240                         (__u32) __pa(card->read.iob[cnt].data);
 241                 ((struct lcs_header *)
 242                  card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
 243                 card->read.iob[cnt].callback = lcs_get_frames_cb;
 244                 card->read.iob[cnt].state = BUF_STATE_READY;
 245                 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
 246         }
 247         card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
 248         card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
 249         card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
 250         /* Last ccw is a tic (transfer in channel). */
 251         card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 252         card->read.ccws[LCS_NUM_BUFFS].cda =
 253                 (__u32) __pa(card->read.ccws);
 254         /* Setg initial state of the read channel. */
 255         card->read.state = CH_STATE_INIT;
 256
 257         card->read.io_idx = 0;
 258         card->read.buf_idx = 0;
 259 }
 260
 261 static void
 262 lcs_setup_read(struct lcs_card *card)
 263 {
 264         LCS_DBF_TEXT(3, setup, "initread");
 265
 266         lcs_setup_read_ccws(card);
 267         /* Initialize read channel tasklet. */
 268         card->read.irq_tasklet.data = (unsigned long) &card->read;
 269         card->read.irq_tasklet.func = lcs_tasklet;
 270         /* Initialize waitqueue. */
 271         init_waitqueue_head(&card->read.wait_q);
 272 }
 273
 274 /*
 275  * Setup write channel.
 276  */
 277 static void
 278 lcs_setup_write_ccws(struct lcs_card *card)
 279 {
 280         int cnt;
 281
 282         LCS_DBF_TEXT(3, setup, "iwritccw");
 283         /* Setup write ccws. */
 284         memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
 285         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 286                 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
 287                 card->write.ccws[cnt].count = 0;
 288                 card->write.ccws[cnt].flags =
 289                         CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
 290                 /*
 291                  * Note: we have allocated the buffer with GFP_DMA, so
 292                  * we do not need to do set_normalized_cda.
 293                  */
 294                 card->write.ccws[cnt].cda =
 295                         (__u32) __pa(card->write.iob[cnt].data);
 296         }
 297         /* Last ccw is a tic (transfer in channel). */
 298         card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 299         card->write.ccws[LCS_NUM_BUFFS].cda =
 300                 (__u32) __pa(card->write.ccws);
 301         /* Set initial state of the write channel. */
 302         card->read.state = CH_STATE_INIT;
 303
 304         card->write.io_idx = 0;
 305         card->write.buf_idx = 0;
 306 }
 307
 308 static void
 309 lcs_setup_write(struct lcs_card *card)
 310 {
 311         LCS_DBF_TEXT(3, setup, "initwrit");
 312
 313         lcs_setup_write_ccws(card);
 314         /* Initialize write channel tasklet. */
 315         card->write.irq_tasklet.data = (unsigned long) &card->write;
 316         card->write.irq_tasklet.func = lcs_tasklet;
 317         /* Initialize waitqueue. */
 318         init_waitqueue_head(&card->write.wait_q);
 319 }
 320
 321 static void
 322 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
 323 {
 324         unsigned long flags;
 325
 326         spin_lock_irqsave(&card->mask_lock, flags);
 327         card->thread_allowed_mask = threads;
 328         spin_unlock_irqrestore(&card->mask_lock, flags);
 329         wake_up(&card->wait_q);
 330 }
 331 static inline int
 332 lcs_threads_running(struct lcs_card *card, unsigned long threads)
 333 {
 334         unsigned long flags;
 335         int rc = 0;
 336
 337         spin_lock_irqsave(&card->mask_lock, flags);
 338         rc = (card->thread_running_mask & threads);
 339         spin_unlock_irqrestore(&card->mask_lock, flags);
 340         return rc;
 341 }
 342
 343 static int
 344 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
 345 {
 346         return wait_event_interruptible(card->wait_q,
 347                         lcs_threads_running(card, threads) == 0);
 348 }
 349
 350 static inline int
 351 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
 352 {
 353         unsigned long flags;
 354
 355         spin_lock_irqsave(&card->mask_lock, flags);
 356         if ( !(card->thread_allowed_mask & thread) ||
 357               (card->thread_start_mask & thread) ) {
 358                 spin_unlock_irqrestore(&card->mask_lock, flags);
 359                 return -EPERM;
 360         }
 361         card->thread_start_mask |= thread;
 362         spin_unlock_irqrestore(&card->mask_lock, flags);
 363         return 0;
 364 }
 365
 366 static void
 367 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
 368 {
 369         unsigned long flags;
 370
 371         spin_lock_irqsave(&card->mask_lock, flags);
 372         card->thread_running_mask &= ~thread;
 373         spin_unlock_irqrestore(&card->mask_lock, flags);
 374         wake_up(&card->wait_q);
 375 }
 376
 377 static inline int
 378 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 379 {
 380         unsigned long flags;
 381         int rc = 0;
 382
 383         spin_lock_irqsave(&card->mask_lock, flags);
 384         if (card->thread_start_mask & thread){
 385                 if ((card->thread_allowed_mask & thread) &&
 386                     !(card->thread_running_mask & thread)){
 387                         rc = 1;
 388                         card->thread_start_mask &= ~thread;
 389                         card->thread_running_mask |= thread;
 390                 } else
 391                         rc = -EPERM;
 392         }
 393         spin_unlock_irqrestore(&card->mask_lock, flags);
 394         return rc;
 395 }
 396
 397 static int
 398 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 399 {
 400         int rc = 0;
 401         wait_event(card->wait_q,
 402                    (rc = __lcs_do_run_thread(card, thread)) >= 0);
 403         return rc;
 404 }
 405
 406 static int
 407 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
 408 {
 409         unsigned long flags;
 410         int rc = 0;
 411
 412         spin_lock_irqsave(&card->mask_lock, flags);
 413         LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
 414                         (u8) card->thread_start_mask,
 415                         (u8) card->thread_allowed_mask,
 416                         (u8) card->thread_running_mask);
 417         rc = (card->thread_start_mask & thread);
 418         spin_unlock_irqrestore(&card->mask_lock, flags);
 419         return rc;
 420 }
 421
 422 /**
 423  * Initialize channels,card and state machines.
 424  */
 425 static void
 426 lcs_setup_card(struct lcs_card *card)
 427 {
 428         LCS_DBF_TEXT(2, setup, "initcard");
 429         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 430
 431         lcs_setup_read(card);
 432         lcs_setup_write(card);
 433         /* Set cards initial state. */
 434         card->state = DEV_STATE_DOWN;
 435         card->tx_buffer = NULL;
 436         card->tx_emitted = 0;
 437
 438         /* Initialize kernel thread task used for LGW commands. */
 439         INIT_WORK(&card->kernel_thread_starter,
 440                   (void *)lcs_start_kernel_thread,card);
 441         card->thread_start_mask = 0;
 442         card->thread_allowed_mask = 0;
 443         card->thread_running_mask = 0;
 444         init_waitqueue_head(&card->wait_q);
 445         spin_lock_init(&card->lock);
 446         spin_lock_init(&card->ipm_lock);
 447         spin_lock_init(&card->mask_lock);
 448 #ifdef CONFIG_IP_MULTICAST
 449         INIT_LIST_HEAD(&card->ipm_list);
 450 #endif
 451         INIT_LIST_HEAD(&card->lancmd_waiters);
 452 }
 453
 454 static inline void
 455 lcs_clear_multicast_list(struct lcs_card *card)
 456 {
 457 #ifdef  CONFIG_IP_MULTICAST
 458         struct lcs_ipm_list *ipm;
 459         unsigned long flags;
 460
 461         /* Free multicast list. */
 462         LCS_DBF_TEXT(3, setup, "clmclist");
 463         spin_lock_irqsave(&card->ipm_lock, flags);
 464         while (!list_empty(&card->ipm_list)){
 465                 ipm = list_entry(card->ipm_list.next,
 466                                  struct lcs_ipm_list, list);
 467                 list_del(&ipm->list);
 468                 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
 469                         spin_unlock_irqrestore(&card->ipm_lock, flags);
 470                         lcs_send_delipm(card, ipm);
 471                         spin_lock_irqsave(&card->ipm_lock, flags);
 472                 }
 473                 kfree(ipm);
 474         }
 475         spin_unlock_irqrestore(&card->ipm_lock, flags);
 476 #endif
 477 }
 478 /**
 479  * Cleanup channels,card and state machines.
 480  */
 481 static void
 482 lcs_cleanup_card(struct lcs_card *card)
 483 {
 484
 485         LCS_DBF_TEXT(3, setup, "cleancrd");
 486         LCS_DBF_HEX(2,setup,&card,sizeof(void*));
 487
 488         if (card->dev != NULL)
 489                 free_netdev(card->dev);
 490         /* Cleanup channels. */
 491         lcs_cleanup_channel(&card->write);
 492         lcs_cleanup_channel(&card->read);
 493 }
 494
 495 /**
 496  * Start channel.
 497  */
 498 static int
 499 lcs_start_channel(struct lcs_channel *channel)
 500 {
 501         unsigned long flags;
 502         int rc;
 503
 504         LCS_DBF_TEXT_(4,trace,"ssch%s", channel->ccwdev->dev.bus_id);
 505         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 506         rc = ccw_device_start(channel->ccwdev,
 507                               channel->ccws + channel->io_idx, 0, 0,
 508                               DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
 509         if (rc == 0)
 510                 channel->state = CH_STATE_RUNNING;
 511         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 512         if (rc) {
 513                 LCS_DBF_TEXT_(4,trace,"essh%s", channel->ccwdev->dev.bus_id);
 514                 PRINT_ERR("Error in starting channel, rc=%d!\n", rc);
 515         }
 516         return rc;
 517 }
 518
 519 static int
 520 lcs_clear_channel(struct lcs_channel *channel)
 521 {
 522         unsigned long flags;
 523         int rc;
 524
 525         LCS_DBF_TEXT(4,trace,"clearch");
 526         LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
 527         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 528         rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
 529         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 530         if (rc) {
 531                 LCS_DBF_TEXT_(4,trace,"ecsc%s", channel->ccwdev->dev.bus_id);
 532                 return rc;
 533         }
 534         wait_event(channel->wait_q, (channel->state == CH_STATE_CLEARED));
 535         channel->state = CH_STATE_STOPPED;
 536         return rc;
 537 }
 538
 539
 540 /**
 541  * Stop channel.
 542  */
 543 static int
 544 lcs_stop_channel(struct lcs_channel *channel)
 545 {
 546         unsigned long flags;
 547         int rc;
 548
 549         if (channel->state == CH_STATE_STOPPED)
 550                 return 0;
 551         LCS_DBF_TEXT(4,trace,"haltsch");
 552         LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
 553         channel->state = CH_STATE_INIT;
 554         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 555         rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
 556         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 557         if (rc) {
 558                 LCS_DBF_TEXT_(4,trace,"ehsc%s", channel->ccwdev->dev.bus_id);
 559                 return rc;
 560         }
 561         /* Asynchronous halt initialted. Wait for its completion. */
 562         wait_event(channel->wait_q, (channel->state == CH_STATE_HALTED));
 563         lcs_clear_channel(channel);
 564         return 0;
 565 }
 566
 567 /**
 568  * start read and write channel
 569  */
 570 static int
 571 lcs_start_channels(struct lcs_card *card)
 572 {
 573         int rc;
 574
 575         LCS_DBF_TEXT(2, trace, "chstart");
 576         /* start read channel */
 577         rc = lcs_start_channel(&card->read);
 578         if (rc)
 579                 return rc;
 580         /* start write channel */
 581         rc = lcs_start_channel(&card->write);
 582         if (rc)
 583                 lcs_stop_channel(&card->read);
 584         return rc;
 585 }
 586
 587 /**
 588  * stop read and write channel
 589  */
 590 static int
 591 lcs_stop_channels(struct lcs_card *card)
 592 {
 593         LCS_DBF_TEXT(2, trace, "chhalt");
 594         lcs_stop_channel(&card->read);
 595         lcs_stop_channel(&card->write);
 596         return 0;
 597 }
 598
 599 /**
 600  * Get empty buffer.
 601  */
 602 static struct lcs_buffer *
 603 __lcs_get_buffer(struct lcs_channel *channel)
 604 {
 605         int index;
 606
 607         LCS_DBF_TEXT(5, trace, "_getbuff");
 608         index = channel->io_idx;
 609         do {
 610                 if (channel->iob[index].state == BUF_STATE_EMPTY) {
 611                         channel->iob[index].state = BUF_STATE_LOCKED;
 612                         return channel->iob + index;
 613                 }
 614                 index = (index + 1) & (LCS_NUM_BUFFS - 1);
 615         } while (index != channel->io_idx);
 616         return NULL;
 617 }
 618
 619 static struct lcs_buffer *
 620 lcs_get_buffer(struct lcs_channel *channel)
 621 {
 622         struct lcs_buffer *buffer;
 623         unsigned long flags;
 624
 625         LCS_DBF_TEXT(5, trace, "getbuff");
 626         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 627         buffer = __lcs_get_buffer(channel);
 628         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 629         return buffer;
 630 }
 631
 632 /**
 633  * Resume channel program if the channel is suspended.
 634  */
 635 static int
 636 __lcs_resume_channel(struct lcs_channel *channel)
 637 {
 638         int rc;
 639
 640         if (channel->state != CH_STATE_SUSPENDED)
 641                 return 0;
 642         if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
 643                 return 0;
 644         LCS_DBF_TEXT_(5, trace, "rsch%s", channel->ccwdev->dev.bus_id);
 645         rc = ccw_device_resume(channel->ccwdev);
 646         if (rc) {
 647                 LCS_DBF_TEXT_(4, trace, "ersc%s", channel->ccwdev->dev.bus_id);
 648                 PRINT_ERR("Error in lcs_resume_channel: rc=%d\n",rc);
 649         } else
 650                 channel->state = CH_STATE_RUNNING;
 651         return rc;
 652
 653 }
 654
 655 /**
 656  * Make a buffer ready for processing.
 657  */
 658 static inline void
 659 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
 660 {
 661         int prev, next;
 662
 663         LCS_DBF_TEXT(5, trace, "rdybits");
 664         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 665         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 666         /* Check if we may clear the suspend bit of this buffer. */
 667         if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
 668                 /* Check if we have to set the PCI bit. */
 669                 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
 670                         /* Suspend bit of the previous buffer is not set. */
 671                         channel->ccws[index].flags |= CCW_FLAG_PCI;
 672                 /* Suspend bit of the next buffer is set. */
 673                 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
 674         }
 675 }
 676
 677 static int
 678 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 679 {
 680         unsigned long flags;
 681         int index, rc;
 682
 683         LCS_DBF_TEXT(5, trace, "rdybuff");
 684         if (buffer->state != BUF_STATE_LOCKED &&
 685             buffer->state != BUF_STATE_PROCESSED)
 686                 BUG();
 687         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 688         buffer->state = BUF_STATE_READY;
 689         index = buffer - channel->iob;
 690         /* Set length. */
 691         channel->ccws[index].count = buffer->count;
 692         /* Check relevant PCI/suspend bits. */
 693         __lcs_ready_buffer_bits(channel, index);
 694         rc = __lcs_resume_channel(channel);
 695         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 696         return rc;
 697 }
 698
 699 /**
 700  * Mark the buffer as processed. Take care of the suspend bit
 701  * of the previous buffer. This function is called from
 702  * interrupt context, so the lock must not be taken.
 703  */
 704 static int
 705 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 706 {
 707         int index, prev, next;
 708
 709         LCS_DBF_TEXT(5, trace, "prcsbuff");
 710         if (buffer->state != BUF_STATE_READY)
 711                 BUG();
 712         buffer->state = BUF_STATE_PROCESSED;
 713         index = buffer - channel->iob;
 714         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 715         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 716         /* Set the suspend bit and clear the PCI bit of this buffer. */
 717         channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
 718         channel->ccws[index].flags &= ~CCW_FLAG_PCI;
 719         /* Check the suspend bit of the previous buffer. */
 720         if (channel->iob[prev].state == BUF_STATE_READY) {
 721                 /*
 722                  * Previous buffer is in state ready. It might have
 723                  * happened in lcs_ready_buffer that the suspend bit
 724                  * has not been cleared to avoid an endless loop.
 725                  * Do it now.
 726                  */
 727                 __lcs_ready_buffer_bits(channel, prev);
 728         }
 729         /* Clear PCI bit of next buffer. */
 730         channel->ccws[next].flags &= ~CCW_FLAG_PCI;
 731         return __lcs_resume_channel(channel);
 732 }
 733
 734 /**
 735  * Put a processed buffer back to state empty.
 736  */
 737 static void
 738 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 739 {
 740         unsigned long flags;
 741
 742         LCS_DBF_TEXT(5, trace, "relbuff");
 743         if (buffer->state != BUF_STATE_LOCKED &&
 744             buffer->state != BUF_STATE_PROCESSED)
 745                 BUG();
 746         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 747         buffer->state = BUF_STATE_EMPTY;
 748         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 749 }
 750
 751 /**
 752  * Get buffer for a lan command.
 753  */
 754 static struct lcs_buffer *
 755 lcs_get_lancmd(struct lcs_card *card, int count)
 756 {
 757         struct lcs_buffer *buffer;
 758         struct lcs_cmd *cmd;
 759
 760         LCS_DBF_TEXT(4, trace, "getlncmd");
 761         /* Get buffer and wait if none is available. */
 762         wait_event(card->write.wait_q,
 763                    ((buffer = lcs_get_buffer(&card->write)) != NULL));
 764         count += sizeof(struct lcs_header);
 765         *(__u16 *)(buffer->data + count) = 0;
 766         buffer->count = count + sizeof(__u16);
 767         buffer->callback = lcs_release_buffer;
 768         cmd = (struct lcs_cmd *) buffer->data;
 769         cmd->offset = count;
 770         cmd->type = LCS_FRAME_TYPE_CONTROL;
 771         cmd->slot = 0;
 772         return buffer;
 773 }
 774
 775
 776 static void
 777 lcs_get_reply(struct lcs_reply *reply)
 778 {
 779         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 780         atomic_inc(&reply->refcnt);
 781 }
 782
 783 static void
 784 lcs_put_reply(struct lcs_reply *reply)
 785 {
 786         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 787         if (atomic_dec_and_test(&reply->refcnt)) {
 788                 kfree(reply);
 789         }
 790
 791 }
 792
 793 static struct lcs_reply *
 794 lcs_alloc_reply(struct lcs_cmd *cmd)
 795 {
 796         struct lcs_reply *reply;
 797
 798         LCS_DBF_TEXT(4, trace, "getreply");
 799
 800         reply = kmalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
 801         if (!reply)
 802                 return NULL;
 803         memset(reply,0,sizeof(struct lcs_reply));
 804         atomic_set(&reply->refcnt,1);
 805         reply->sequence_no = cmd->sequence_no;
 806         reply->received = 0;
 807         reply->rc = 0;
 808         init_waitqueue_head(&reply->wait_q);
 809
 810         return reply;
 811 }
 812
 813 /**
 814  * Notifier function for lancmd replies. Called from read irq.
 815  */
 816 static void
 817 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
 818 {
 819         struct list_head *l, *n;
 820         struct lcs_reply *reply;
 821
 822         LCS_DBF_TEXT(4, trace, "notiwait");
 823         spin_lock(&card->lock);
 824         list_for_each_safe(l, n, &card->lancmd_waiters) {
 825                 reply = list_entry(l, struct lcs_reply, list);
 826                 if (reply->sequence_no == cmd->sequence_no) {
 827                         lcs_get_reply(reply);
 828                         list_del_init(&reply->list);
 829                         if (reply->callback != NULL)
 830                                 reply->callback(card, cmd);
 831                         reply->received = 1;
 832                         reply->rc = cmd->return_code;
 833                         wake_up(&reply->wait_q);
 834                         lcs_put_reply(reply);
 835                         break;
 836                 }
 837         }
 838         spin_unlock(&card->lock);
 839 }
 840
 841 /**
 842  * Emit buffer of a lan comand.
 843  */
 844 void
 845 lcs_lancmd_timeout(unsigned long data)
 846 {
 847         struct lcs_reply *reply, *list_reply, *r;
 848         unsigned long flags;
 849
 850         LCS_DBF_TEXT(4, trace, "timeout");
 851         reply = (struct lcs_reply *) data;
 852         spin_lock_irqsave(&reply->card->lock, flags);
 853         list_for_each_entry_safe(list_reply, r,
 854                                  &reply->card->lancmd_waiters,list) {
 855                 if (reply == list_reply) {
 856                         lcs_get_reply(reply);
 857                         list_del_init(&reply->list);
 858                         spin_unlock_irqrestore(&reply->card->lock, flags);
 859                         reply->received = 1;
 860                         reply->rc = -ETIME;
 861                         wake_up(&reply->wait_q);
 862                         lcs_put_reply(reply);
 863                         return;
 864                 }
 865         }
 866         spin_unlock_irqrestore(&reply->card->lock, flags);
 867 }
 868
 869 static int
 870 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
 871                 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
 872 {
 873         struct lcs_reply *reply;
 874         struct lcs_cmd *cmd;
 875         struct timer_list timer;
 876         unsigned long flags;
 877         int rc;
 878
 879         LCS_DBF_TEXT(4, trace, "sendcmd");
 880         cmd = (struct lcs_cmd *) buffer->data;
 881         cmd->return_code = 0;
 882         cmd->sequence_no = card->sequence_no++;
 883         reply = lcs_alloc_reply(cmd);
 884         if (!reply)
 885                 return -ENOMEM;
 886         reply->callback = reply_callback;
 887         reply->card = card;
 888         spin_lock_irqsave(&card->lock, flags);
 889         list_add_tail(&reply->list, &card->lancmd_waiters);
 890         spin_unlock_irqrestore(&card->lock, flags);
 891
 892         buffer->callback = lcs_release_buffer;
 893         rc = lcs_ready_buffer(&card->write, buffer);
 894         if (rc)
 895                 return rc;
 896         init_timer(&timer);
 897         timer.function = lcs_lancmd_timeout;
 898         timer.data = (unsigned long) reply;
 899         timer.expires = jiffies + HZ*card->lancmd_timeout;
 900         add_timer(&timer);
 901         wait_event(reply->wait_q, reply->received);
 902         del_timer_sync(&timer);
 903         LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
 904         rc = reply->rc;
 905         lcs_put_reply(reply);
 906         return rc ? -EIO : 0;
 907 }
 908
 909 /**
 910  * LCS startup command
 911  */
 912 static int
 913 lcs_send_startup(struct lcs_card *card, __u8 initiator)
 914 {
 915         struct lcs_buffer *buffer;
 916         struct lcs_cmd *cmd;
 917
 918         LCS_DBF_TEXT(2, trace, "startup");
 919         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 920         cmd = (struct lcs_cmd *) buffer->data;
 921         cmd->cmd_code = LCS_CMD_STARTUP;
 922         cmd->initiator = initiator;
 923         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
 924         return lcs_send_lancmd(card, buffer, NULL);
 925 }
 926
 927 /**
 928  * LCS shutdown command
 929  */
 930 static int
 931 lcs_send_shutdown(struct lcs_card *card)
 932 {
 933         struct lcs_buffer *buffer;
 934         struct lcs_cmd *cmd;
 935
 936         LCS_DBF_TEXT(2, trace, "shutdown");
 937         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 938         cmd = (struct lcs_cmd *) buffer->data;
 939         cmd->cmd_code = LCS_CMD_SHUTDOWN;
 940         cmd->initiator = LCS_INITIATOR_TCPIP;
 941         return lcs_send_lancmd(card, buffer, NULL);
 942 }
 943
 944 /**
 945  * LCS lanstat command
 946  */
 947 static void
 948 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 949 {
 950         LCS_DBF_TEXT(2, trace, "statcb");
 951         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
 952 }
 953
 954 static int
 955 lcs_send_lanstat(struct lcs_card *card)
 956 {
 957         struct lcs_buffer *buffer;
 958         struct lcs_cmd *cmd;
 959
 960         LCS_DBF_TEXT(2,trace, "cmdstat");
 961         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 962         cmd = (struct lcs_cmd *) buffer->data;
 963         /* Setup lanstat command. */
 964         cmd->cmd_code = LCS_CMD_LANSTAT;
 965         cmd->initiator = LCS_INITIATOR_TCPIP;
 966         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 967         cmd->cmd.lcs_std_cmd.portno = card->portno;
 968         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
 969 }
 970
 971 /**
 972  * send stoplan command
 973  */
 974 static int
 975 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
 976 {
 977         struct lcs_buffer *buffer;
 978         struct lcs_cmd *cmd;
 979
 980         LCS_DBF_TEXT(2, trace, "cmdstpln");
 981         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 982         cmd = (struct lcs_cmd *) buffer->data;
 983         cmd->cmd_code = LCS_CMD_STOPLAN;
 984         cmd->initiator = initiator;
 985         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 986         cmd->cmd.lcs_std_cmd.portno = card->portno;
 987         return lcs_send_lancmd(card, buffer, NULL);
 988 }
 989
 990 /**
 991  * send startlan command
 992  */
 993 static void
 994 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 995 {
 996         LCS_DBF_TEXT(2, trace, "srtlancb");
 997         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
 998         card->portno = cmd->cmd.lcs_std_cmd.portno;
 999 }
1000
1001 static int
1002 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1003 {
1004         struct lcs_buffer *buffer;
1005         struct lcs_cmd *cmd;
1006
1007         LCS_DBF_TEXT(2, trace, "cmdstaln");
1008         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1009         cmd = (struct lcs_cmd *) buffer->data;
1010         cmd->cmd_code = LCS_CMD_STARTLAN;
1011         cmd->initiator = initiator;
1012         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1013         cmd->cmd.lcs_std_cmd.portno = card->portno;
1014         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1015 }
1016
1017 #ifdef CONFIG_IP_MULTICAST
1018 /**
1019  * send setipm command (Multicast)
1020  */
1021 static int
1022 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1023 {
1024         struct lcs_buffer *buffer;
1025         struct lcs_cmd *cmd;
1026
1027         LCS_DBF_TEXT(2, trace, "cmdsetim");
1028         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1029         cmd = (struct lcs_cmd *) buffer->data;
1030         cmd->cmd_code = LCS_CMD_SETIPM;
1031         cmd->initiator = LCS_INITIATOR_TCPIP;
1032         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1033         cmd->cmd.lcs_qipassist.portno = card->portno;
1034         cmd->cmd.lcs_qipassist.version = 4;
1035         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1036         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1037                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1038         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1039         return lcs_send_lancmd(card, buffer, NULL);
1040 }
1041
1042 /**
1043  * send delipm command (Multicast)
1044  */
1045 static int
1046 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1047 {
1048         struct lcs_buffer *buffer;
1049         struct lcs_cmd *cmd;
1050
1051         LCS_DBF_TEXT(2, trace, "cmddelim");
1052         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1053         cmd = (struct lcs_cmd *) buffer->data;
1054         cmd->cmd_code = LCS_CMD_DELIPM;
1055         cmd->initiator = LCS_INITIATOR_TCPIP;
1056         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1057         cmd->cmd.lcs_qipassist.portno = card->portno;
1058         cmd->cmd.lcs_qipassist.version = 4;
1059         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1060         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1061                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1062         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1063         return lcs_send_lancmd(card, buffer, NULL);
1064 }
1065
1066 /**
1067  * check if multicast is supported by LCS
1068  */
1069 static void
1070 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1071 {
1072         LCS_DBF_TEXT(2, trace, "chkmccb");
1073         card->ip_assists_supported =
1074                 cmd->cmd.lcs_qipassist.ip_assists_supported;
1075         card->ip_assists_enabled =
1076                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1077 }
1078
1079 static int
1080 lcs_check_multicast_support(struct lcs_card *card)
1081 {
1082         struct lcs_buffer *buffer;
1083         struct lcs_cmd *cmd;
1084         int rc;
1085
1086         LCS_DBF_TEXT(2, trace, "cmdqipa");
1087         /* Send query ipassist. */
1088         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1089         cmd = (struct lcs_cmd *) buffer->data;
1090         cmd->cmd_code = LCS_CMD_QIPASSIST;
1091         cmd->initiator = LCS_INITIATOR_TCPIP;
1092         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1093         cmd->cmd.lcs_qipassist.portno = card->portno;
1094         cmd->cmd.lcs_qipassist.version = 4;
1095         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1096         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1097         if (rc != 0) {
1098                 PRINT_ERR("Query IPAssist failed. Assuming unsupported!\n");
1099                 return -EOPNOTSUPP;
1100         }
1101         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1102                 return 0;
1103         return -EOPNOTSUPP;
1104 }
1105
1106 /**
1107  * set or del multicast address on LCS card
1108  */
1109 static void
1110 lcs_fix_multicast_list(struct lcs_card *card)
1111 {
1112         struct list_head failed_list;
1113         struct lcs_ipm_list *ipm, *tmp;
1114         unsigned long flags;
1115         int rc;
1116
1117         LCS_DBF_TEXT(4,trace, "fixipm");
1118         INIT_LIST_HEAD(&failed_list);
1119         spin_lock_irqsave(&card->ipm_lock, flags);
1120 list_modified:
1121         list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1122                 switch (ipm->ipm_state) {
1123                 case LCS_IPM_STATE_SET_REQUIRED:
1124                         /* del from ipm_list so noone else can tamper with
1125                          * this entry */
1126                         list_del_init(&ipm->list);
1127                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1128                         rc = lcs_send_setipm(card, ipm);
1129                         spin_lock_irqsave(&card->ipm_lock, flags);
1130                         if (rc) {
1131                                 PRINT_INFO("Adding multicast address failed."
1132                                            "Table possibly full!\n");
1133                                 /* store ipm in failed list -> will be added
1134                                  * to ipm_list again, so a retry will be done
1135                                  * during the next call of this function */
1136                                 list_add_tail(&ipm->list, &failed_list);
1137                         } else {
1138                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1139                                 /* re-insert into ipm_list */
1140                                 list_add_tail(&ipm->list, &card->ipm_list);
1141                         }
1142                         goto list_modified;
1143                 case LCS_IPM_STATE_DEL_REQUIRED:
1144                         list_del(&ipm->list);
1145                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1146                         lcs_send_delipm(card, ipm);
1147                         spin_lock_irqsave(&card->ipm_lock, flags);
1148                         kfree(ipm);
1149                         goto list_modified;
1150                 case LCS_IPM_STATE_ON_CARD:
1151                         break;
1152                 }
1153         }
1154         /* re-insert all entries from the failed_list into ipm_list */
1155         list_for_each_entry_safe(ipm, tmp, &failed_list, list) {
1156                 list_del_init(&ipm->list);
1157                 list_add_tail(&ipm->list, &card->ipm_list);
1158         }
1159         spin_unlock_irqrestore(&card->ipm_lock, flags);
1160         if (card->state == DEV_STATE_UP)
1161                 netif_wake_queue(card->dev);
1162 }
1163
1164 /**
1165  * get mac address for the relevant Multicast address
1166  */
1167 static void
1168 lcs_get_mac_for_ipm(__u32 ipm, char *mac, struct net_device *dev)
1169 {
1170         LCS_DBF_TEXT(4,trace, "getmac");
1171         if (dev->type == ARPHRD_IEEE802_TR)
1172                 ip_tr_mc_map(ipm, mac);
1173         else
1174                 ip_eth_mc_map(ipm, mac);
1175 }
1176
1177 /**
1178  * function called by net device to handle multicast address relevant things
1179  */
1180 static inline void
1181 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1182 {
1183         struct ip_mc_list *im4;
1184         struct list_head *l;
1185         struct lcs_ipm_list *ipm;
1186         unsigned long flags;
1187         char buf[MAX_ADDR_LEN];
1188
1189         LCS_DBF_TEXT(4, trace, "remmclst");
1190         spin_lock_irqsave(&card->ipm_lock, flags);
1191         list_for_each(l, &card->ipm_list) {
1192                 ipm = list_entry(l, struct lcs_ipm_list, list);
1193                 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
1194                         lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1195                         if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1196                              (memcmp(buf, &ipm->ipm.mac_addr,
1197                                      LCS_MAC_LENGTH) == 0) )
1198                                 break;
1199                 }
1200                 if (im4 == NULL)
1201                         ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1202         }
1203         spin_unlock_irqrestore(&card->ipm_lock, flags);
1204 }
1205
1206 static inline struct lcs_ipm_list *
1207 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1208 {
1209         struct lcs_ipm_list *tmp, *ipm = NULL;
1210         struct list_head *l;
1211         unsigned long flags;
1212
1213         LCS_DBF_TEXT(4, trace, "chkmcent");
1214         spin_lock_irqsave(&card->ipm_lock, flags);
1215         list_for_each(l, &card->ipm_list) {
1216                 tmp = list_entry(l, struct lcs_ipm_list, list);
1217                 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1218                      (memcmp(buf, &tmp->ipm.mac_addr,
1219                              LCS_MAC_LENGTH) == 0) ) {
1220                         ipm = tmp;
1221                         break;
1222                 }
1223         }
1224         spin_unlock_irqrestore(&card->ipm_lock, flags);
1225         return ipm;
1226 }
1227
1228 static inline void
1229 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1230 {
1231
1232         struct ip_mc_list *im4;
1233         struct lcs_ipm_list *ipm;
1234         char buf[MAX_ADDR_LEN];
1235         unsigned long flags;
1236
1237         LCS_DBF_TEXT(4, trace, "setmclst");
1238         for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
1239                 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1240                 ipm = lcs_check_addr_entry(card, im4, buf);
1241                 if (ipm != NULL)
1242                         continue;       /* Address already in list. */
1243                 ipm = (struct lcs_ipm_list *)
1244                         kmalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1245                 if (ipm == NULL) {
1246                         PRINT_INFO("Not enough memory to add "
1247                                    "new multicast entry!\n");
1248                         break;
1249                 }
1250                 memset(ipm, 0, sizeof(struct lcs_ipm_list));
1251                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1252                 ipm->ipm.ip_addr = im4->multiaddr;
1253                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1254                 spin_lock_irqsave(&card->ipm_lock, flags);
1255                 list_add(&ipm->list, &card->ipm_list);
1256                 spin_unlock_irqrestore(&card->ipm_lock, flags);
1257         }
1258 }
1259
1260 static int
1261 lcs_register_mc_addresses(void *data)
1262 {
1263         struct lcs_card *card;
1264         struct in_device *in4_dev;
1265
1266         card = (struct lcs_card *) data;
1267         daemonize("regipm");
1268
1269         if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1270                 return 0;
1271         LCS_DBF_TEXT(4, trace, "regmulti");
1272
1273         in4_dev = in_dev_get(card->dev);
1274         if (in4_dev == NULL)
1275                 goto out;
1276         read_lock(&in4_dev->mc_list_lock);
1277         lcs_remove_mc_addresses(card,in4_dev);
1278         lcs_set_mc_addresses(card, in4_dev);
1279         read_unlock(&in4_dev->mc_list_lock);
1280         in_dev_put(in4_dev);
1281
1282         lcs_fix_multicast_list(card);
1283 out:
1284         lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1285         return 0;
1286 }
1287 /**
1288  * function called by net device to
1289  * handle multicast address relevant things
1290  */
1291 static void
1292 lcs_set_multicast_list(struct net_device *dev)
1293 {
1294         struct lcs_card *card;
1295
1296         LCS_DBF_TEXT(4, trace, "setmulti");
1297         card = (struct lcs_card *) dev->priv;
1298
1299         if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD)) {
1300                 schedule_work(&card->kernel_thread_starter);
1301         }
1302 }
1303
1304 #endif /* CONFIG_IP_MULTICAST */
1305
1306 static long
1307 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1308 {
1309         if (!IS_ERR(irb))
1310                 return 0;
1311
1312         switch (PTR_ERR(irb)) {
1313         case -EIO:
1314                 PRINT_WARN("i/o-error on device %s\n", cdev->dev.bus_id);
1315                 LCS_DBF_TEXT(2, trace, "ckirberr");
1316                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1317                 break;
1318         case -ETIMEDOUT:
1319                 PRINT_WARN("timeout on device %s\n", cdev->dev.bus_id);
1320                 LCS_DBF_TEXT(2, trace, "ckirberr");
1321                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1322                 break;
1323         default:
1324                 PRINT_WARN("unknown error %ld on device %s\n", PTR_ERR(irb),
1325                            cdev->dev.bus_id);
1326                 LCS_DBF_TEXT(2, trace, "ckirberr");
1327                 LCS_DBF_TEXT(2, trace, "  rc???");
1328         }
1329         return PTR_ERR(irb);
1330 }
1331
1332
1333 /**
1334  * IRQ Handler for LCS channels
1335  */
1336 static void
1337 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1338 {
1339         struct lcs_card *card;
1340         struct lcs_channel *channel;
1341         int index;
1342
1343         if (lcs_check_irb_error(cdev, irb))
1344                 return;
1345
1346         card = CARD_FROM_DEV(cdev);
1347         if (card->read.ccwdev == cdev)
1348                 channel = &card->read;
1349         else
1350                 channel = &card->write;
1351
1352         LCS_DBF_TEXT_(5, trace, "Rint%s",cdev->dev.bus_id);
1353         LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.cstat, irb->scsw.dstat);
1354         LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.fctl, irb->scsw.actl);
1355
1356         /* How far in the ccw chain have we processed? */
1357         if ((channel->state != CH_STATE_INIT) &&
1358             (irb->scsw.fctl & SCSW_FCTL_START_FUNC)) {
1359                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cpa)
1360                         - channel->ccws;
1361                 if ((irb->scsw.actl & SCSW_ACTL_SUSPENDED) ||
1362                     (irb->scsw.cstat | SCHN_STAT_PCI))
1363                         /* Bloody io subsystem tells us lies about cpa... */
1364                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1365                 while (channel->io_idx != index) {
1366                         __lcs_processed_buffer(channel,
1367                                                channel->iob + channel->io_idx);
1368                         channel->io_idx =
1369                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1370                 }
1371         }
1372
1373         if ((irb->scsw.dstat & DEV_STAT_DEV_END) ||
1374             (irb->scsw.dstat & DEV_STAT_CHN_END) ||
1375             (irb->scsw.dstat & DEV_STAT_UNIT_CHECK))
1376                 /* Mark channel as stopped. */
1377                 channel->state = CH_STATE_STOPPED;
1378         else if (irb->scsw.actl & SCSW_ACTL_SUSPENDED)
1379                 /* CCW execution stopped on a suspend bit. */
1380                 channel->state = CH_STATE_SUSPENDED;
1381
1382         if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) {
1383                 if (irb->scsw.cc != 0) {
1384                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1385                         return;
1386                 }
1387                 /* The channel has been stopped by halt_IO. */
1388                 channel->state = CH_STATE_HALTED;
1389         }
1390
1391         if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) {
1392                 channel->state = CH_STATE_CLEARED;
1393         }
1394         /* Do the rest in the tasklet. */
1395         tasklet_schedule(&channel->irq_tasklet);
1396 }
1397
1398 /**
1399  * Tasklet for IRQ handler
1400  */
1401 static void
1402 lcs_tasklet(unsigned long data)
1403 {
1404         unsigned long flags;
1405         struct lcs_channel *channel;
1406         struct lcs_buffer *iob;
1407         int buf_idx;
1408         int rc;
1409
1410         channel = (struct lcs_channel *) data;
1411         LCS_DBF_TEXT_(5, trace, "tlet%s",channel->ccwdev->dev.bus_id);
1412
1413         /* Check for processed buffers. */
1414         iob = channel->iob;
1415         buf_idx = channel->buf_idx;
1416         while (iob[buf_idx].state == BUF_STATE_PROCESSED) {
1417                 /* Do the callback thing. */
1418                 if (iob[buf_idx].callback != NULL)
1419                         iob[buf_idx].callback(channel, iob + buf_idx);
1420                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1421         }
1422         channel->buf_idx = buf_idx;
1423
1424         if (channel->state == CH_STATE_STOPPED)
1425                 // FIXME: what if rc != 0 ??
1426                 rc = lcs_start_channel(channel);
1427         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1428         if (channel->state == CH_STATE_SUSPENDED &&
1429             channel->iob[channel->io_idx].state == BUF_STATE_READY) {
1430                 // FIXME: what if rc != 0 ??
1431                 rc = __lcs_resume_channel(channel);
1432         }
1433         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1434
1435         /* Something happened on the channel. Wake up waiters. */
1436         wake_up(&channel->wait_q);
1437 }
1438
1439 /**
1440  * Finish current tx buffer and make it ready for transmit.
1441  */
1442 static void
1443 __lcs_emit_txbuffer(struct lcs_card *card)
1444 {
1445         LCS_DBF_TEXT(5, trace, "emittx");
1446         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1447         card->tx_buffer->count += 2;
1448         lcs_ready_buffer(&card->write, card->tx_buffer);
1449         card->tx_buffer = NULL;
1450         card->tx_emitted++;
1451 }
1452
1453 /**
1454  * Callback for finished tx buffers.
1455  */
1456 static void
1457 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1458 {
1459         struct lcs_card *card;
1460
1461         LCS_DBF_TEXT(5, trace, "txbuffcb");
1462         /* Put buffer back to pool. */
1463         lcs_release_buffer(channel, buffer);
1464         card = (struct lcs_card *)
1465                 ((char *) channel - offsetof(struct lcs_card, write));
1466         spin_lock(&card->lock);
1467         card->tx_emitted--;
1468         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1469                 /*
1470                  * Last running tx buffer has finished. Submit partially
1471                  * filled current buffer.
1472                  */
1473                 __lcs_emit_txbuffer(card);
1474         spin_unlock(&card->lock);
1475 }
1476
1477 /**
1478  * Packet transmit function called by network stack
1479  */
1480 static int
1481 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1482                  struct net_device *dev)
1483 {
1484         struct lcs_header *header;
1485
1486         LCS_DBF_TEXT(5, trace, "hardxmit");
1487         if (skb == NULL) {
1488                 card->stats.tx_dropped++;
1489                 card->stats.tx_errors++;
1490                 return -EIO;
1491         }
1492         if (card->state != DEV_STATE_UP) {
1493                 dev_kfree_skb(skb);
1494                 card->stats.tx_dropped++;
1495                 card->stats.tx_errors++;
1496                 card->stats.tx_carrier_errors++;
1497                 return 0;
1498         }
1499         if (netif_queue_stopped(dev) ) {
1500                 card->stats.tx_dropped++;
1501                 return -EBUSY;
1502         }
1503         if (card->tx_buffer != NULL &&
1504             card->tx_buffer->count + sizeof(struct lcs_header) +
1505             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1506                 /* skb too big for current tx buffer. */
1507                 __lcs_emit_txbuffer(card);
1508         if (card->tx_buffer == NULL) {
1509                 /* Get new tx buffer */
1510                 card->tx_buffer = lcs_get_buffer(&card->write);
1511                 if (card->tx_buffer == NULL) {
1512                         card->stats.tx_dropped++;
1513                         return -EBUSY;
1514                 }
1515                 card->tx_buffer->callback = lcs_txbuffer_cb;
1516                 card->tx_buffer->count = 0;
1517         }
1518         header = (struct lcs_header *)
1519                 (card->tx_buffer->data + card->tx_buffer->count);
1520         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1521         header->offset = card->tx_buffer->count;
1522         header->type = card->lan_type;
1523         header->slot = card->portno;
1524         memcpy(header + 1, skb->data, skb->len);
1525         card->stats.tx_bytes += skb->len;
1526         card->stats.tx_packets++;
1527         dev_kfree_skb(skb);
1528         if (card->tx_emitted <= 0)
1529                 /* If this is the first tx buffer emit it immediately. */
1530                 __lcs_emit_txbuffer(card);
1531         return 0;
1532 }
1533
1534 static int
1535 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1536 {
1537         struct lcs_card *card;
1538         int rc;
1539
1540         LCS_DBF_TEXT(5, trace, "pktxmit");
1541         card = (struct lcs_card *) dev->priv;
1542         spin_lock(&card->lock);
1543         rc = __lcs_start_xmit(card, skb, dev);
1544         spin_unlock(&card->lock);
1545         return rc;
1546 }
1547
1548 /**
1549  * send startlan and lanstat command to make LCS device ready
1550  */
1551 static int
1552 lcs_startlan_auto(struct lcs_card *card)
1553 {
1554         int rc;
1555
1556         LCS_DBF_TEXT(2, trace, "strtauto");
1557 #ifdef CONFIG_NET_ETHERNET
1558         card->lan_type = LCS_FRAME_TYPE_ENET;
1559         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1560         if (rc == 0)
1561                 return 0;
1562
1563 #endif
1564 #ifdef CONFIG_TR
1565         card->lan_type = LCS_FRAME_TYPE_TR;
1566         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1567         if (rc == 0)
1568                 return 0;
1569 #endif
1570 #ifdef CONFIG_FDDI
1571         card->lan_type = LCS_FRAME_TYPE_FDDI;
1572         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1573         if (rc == 0)
1574                 return 0;
1575 #endif
1576         return -EIO;
1577 }
1578
1579 static int
1580 lcs_startlan(struct lcs_card *card)
1581 {
1582         int rc, i;
1583
1584         LCS_DBF_TEXT(2, trace, "startlan");
1585         rc = 0;
1586         if (card->portno != LCS_INVALID_PORT_NO) {
1587                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1588                         rc = lcs_startlan_auto(card);
1589                 else
1590                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1591         } else {
1592                 for (i = 0; i <= 16; i++) {
1593                         card->portno = i;
1594                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1595                                 rc = lcs_send_startlan(card,
1596                                                        LCS_INITIATOR_TCPIP);
1597                         else
1598                                 /* autodetecting lan type */
1599                                 rc = lcs_startlan_auto(card);
1600                         if (rc == 0)
1601                                 break;
1602                 }
1603         }
1604         if (rc == 0)
1605                 return lcs_send_lanstat(card);
1606         return rc;
1607 }
1608
1609 /**
1610  * LCS detect function
1611  * setup channels and make them I/O ready
1612  */
1613 static int
1614 lcs_detect(struct lcs_card *card)
1615 {
1616         int rc = 0;
1617
1618         LCS_DBF_TEXT(2, setup, "lcsdetct");
1619         /* start/reset card */
1620         if (card->dev)
1621                 netif_stop_queue(card->dev);
1622         rc = lcs_stop_channels(card);
1623         if (rc == 0) {
1624                 rc = lcs_start_channels(card);
1625                 if (rc == 0) {
1626                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1627                         if (rc == 0)
1628                                 rc = lcs_startlan(card);
1629                 }
1630         }
1631         if (rc == 0) {
1632                 card->state = DEV_STATE_UP;
1633         } else {
1634                 card->state = DEV_STATE_DOWN;
1635                 card->write.state = CH_STATE_INIT;
1636                 card->read.state =  CH_STATE_INIT;
1637         }
1638         return rc;
1639 }
1640
1641 /**
1642  * reset card
1643  */
1644 static int
1645 lcs_resetcard(struct lcs_card *card)
1646 {
1647         int retries;
1648
1649         LCS_DBF_TEXT(2, trace, "rescard");
1650         for (retries = 0; retries < 10; retries++) {
1651                 if (lcs_detect(card) == 0) {
1652                         netif_wake_queue(card->dev);
1653                         card->state = DEV_STATE_UP;
1654                         PRINT_INFO("LCS device %s successfully restarted!\n",
1655                                    card->dev->name);
1656                         return 0;
1657                 }
1658                 msleep(3000);
1659         }
1660         PRINT_ERR("Error in Reseting LCS card!\n");
1661         return -EIO;
1662 }
1663
1664
1665 /**
1666  * LCS Stop card
1667  */
1668 static int
1669 lcs_stopcard(struct lcs_card *card)
1670 {
1671         int rc;
1672
1673         LCS_DBF_TEXT(3, setup, "stopcard");
1674
1675         if (card->read.state != CH_STATE_STOPPED &&
1676             card->write.state != CH_STATE_STOPPED &&
1677             card->state == DEV_STATE_UP) {
1678                 lcs_clear_multicast_list(card);
1679                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1680                 rc = lcs_send_shutdown(card);
1681         }
1682         rc = lcs_stop_channels(card);
1683         card->state = DEV_STATE_DOWN;
1684
1685         return rc;
1686 }
1687
1688 /**
1689  * LGW initiated commands
1690  */
1691 static int
1692 lcs_lgw_startlan_thread(void *data)
1693 {
1694         struct lcs_card *card;
1695
1696         card = (struct lcs_card *) data;
1697         daemonize("lgwstpln");
1698
1699         if (!lcs_do_run_thread(card, LCS_STARTLAN_THREAD))
1700                 return 0;
1701         LCS_DBF_TEXT(4, trace, "lgwstpln");
1702         if (card->dev)
1703                 netif_stop_queue(card->dev);
1704         if (lcs_startlan(card) == 0) {
1705                 netif_wake_queue(card->dev);
1706                 card->state = DEV_STATE_UP;
1707                 PRINT_INFO("LCS Startlan for device %s succeeded!\n",
1708                            card->dev->name);
1709
1710         } else
1711                 PRINT_ERR("LCS Startlan for device %s failed!\n",
1712                           card->dev->name);
1713         lcs_clear_thread_running_bit(card, LCS_STARTLAN_THREAD);
1714         return 0;
1715 }
1716
1717 /**
1718  * Send startup command initiated by Lan Gateway
1719  */
1720 static int
1721 lcs_lgw_startup_thread(void *data)
1722 {
1723         int rc;
1724
1725         struct lcs_card *card;
1726
1727         card = (struct lcs_card *) data;
1728         daemonize("lgwstaln");
1729
1730         if (!lcs_do_run_thread(card, LCS_STARTUP_THREAD))
1731                 return 0;
1732         LCS_DBF_TEXT(4, trace, "lgwstaln");
1733         if (card->dev)
1734                 netif_stop_queue(card->dev);
1735         rc = lcs_send_startup(card, LCS_INITIATOR_LGW);
1736         if (rc != 0) {
1737                 PRINT_ERR("Startup for LCS device %s initiated " \
1738                           "by LGW failed!\nReseting card ...\n",
1739                           card->dev->name);
1740                 /* do a card reset */
1741                 rc = lcs_resetcard(card);
1742                 if (rc == 0)
1743                         goto Done;
1744         }
1745         rc = lcs_startlan(card);
1746         if (rc == 0) {
1747                 netif_wake_queue(card->dev);
1748                 card->state = DEV_STATE_UP;
1749         }
1750 Done:
1751         if (rc == 0)
1752                 PRINT_INFO("LCS Startup for device %s succeeded!\n",
1753                            card->dev->name);
1754         else
1755                 PRINT_ERR("LCS Startup for device %s failed!\n",
1756                           card->dev->name);
1757         lcs_clear_thread_running_bit(card, LCS_STARTUP_THREAD);
1758         return 0;
1759 }
1760
1761
1762 /**
1763  * send stoplan command initiated by Lan Gateway
1764  */
1765 static int
1766 lcs_lgw_stoplan_thread(void *data)
1767 {
1768         struct lcs_card *card;
1769         int rc;
1770
1771         card = (struct lcs_card *) data;
1772         daemonize("lgwstop");
1773
1774         if (!lcs_do_run_thread(card, LCS_STOPLAN_THREAD))
1775                 return 0;
1776         LCS_DBF_TEXT(4, trace, "lgwstop");
1777         if (card->dev)
1778                 netif_stop_queue(card->dev);
1779         if (lcs_send_stoplan(card, LCS_INITIATOR_LGW) == 0)
1780                 PRINT_INFO("Stoplan for %s initiated by LGW succeeded!\n",
1781                            card->dev->name);
1782         else
1783                 PRINT_ERR("Stoplan %s initiated by LGW failed!\n",
1784                           card->dev->name);
1785         /*Try to reset the card, stop it on failure */
1786         rc = lcs_resetcard(card);
1787         if (rc != 0)
1788                 rc = lcs_stopcard(card);
1789         lcs_clear_thread_running_bit(card, LCS_STOPLAN_THREAD);
1790         return rc;
1791 }
1792
1793 /**
1794  * Kernel Thread helper functions for LGW initiated commands
1795  */
1796 static void
1797 lcs_start_kernel_thread(struct lcs_card *card)
1798 {
1799         LCS_DBF_TEXT(5, trace, "krnthrd");
1800         if (lcs_do_start_thread(card, LCS_STARTUP_THREAD))
1801                 kernel_thread(lcs_lgw_startup_thread, (void *) card, SIGCHLD);
1802         if (lcs_do_start_thread(card, LCS_STARTLAN_THREAD))
1803                 kernel_thread(lcs_lgw_startlan_thread, (void *) card, SIGCHLD);
1804         if (lcs_do_start_thread(card, LCS_STOPLAN_THREAD))
1805                 kernel_thread(lcs_lgw_stoplan_thread, (void *) card, SIGCHLD);
1806 #ifdef CONFIG_IP_MULTICAST
1807         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1808                 kernel_thread(lcs_register_mc_addresses, (void *) card, SIGCHLD);
1809 #endif
1810 }
1811
1812 /**
1813  * Process control frames.
1814  */
1815 static void
1816 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1817 {
1818         LCS_DBF_TEXT(5, trace, "getctrl");
1819         if (cmd->initiator == LCS_INITIATOR_LGW) {
1820                 switch(cmd->cmd_code) {
1821                 case LCS_CMD_STARTUP:
1822                         if (!lcs_set_thread_start_bit(card,
1823                                                       LCS_STARTUP_THREAD))
1824                                 schedule_work(&card->kernel_thread_starter);
1825                         break;
1826                 case LCS_CMD_STARTLAN:
1827                         if (!lcs_set_thread_start_bit(card,
1828                                                       LCS_STARTLAN_THREAD))
1829                                 schedule_work(&card->kernel_thread_starter);
1830                         break;
1831                 case LCS_CMD_STOPLAN:
1832                         if (!lcs_set_thread_start_bit(card,
1833                                                       LCS_STOPLAN_THREAD))
1834                                 schedule_work(&card->kernel_thread_starter);
1835                         break;
1836                 default:
1837                         PRINT_INFO("UNRECOGNIZED LGW COMMAND\n");
1838                         break;
1839                 }
1840         } else
1841                 lcs_notify_lancmd_waiters(card, cmd);
1842 }
1843
1844 /**
1845  * Unpack network packet.
1846  */
1847 static void
1848 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1849 {
1850         struct sk_buff *skb;
1851
1852         LCS_DBF_TEXT(5, trace, "getskb");
1853         if (card->dev == NULL ||
1854             card->state != DEV_STATE_UP)
1855                 /* The card isn't up. Ignore the packet. */
1856                 return;
1857
1858         skb = dev_alloc_skb(skb_len);
1859         if (skb == NULL) {
1860                 PRINT_ERR("LCS: alloc_skb failed for device=%s\n",
1861                           card->dev->name);
1862                 card->stats.rx_dropped++;
1863                 return;
1864         }
1865         skb->dev = card->dev;
1866         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1867         skb->protocol = card->lan_type_trans(skb, card->dev);
1868         card->stats.rx_bytes += skb_len;
1869         card->stats.rx_packets++;
1870         *((__u32 *)skb->cb) = ++card->pkt_seq;
1871         netif_rx(skb);
1872 }
1873
1874 /**
1875  * LCS main routine to get packets and lancmd replies from the buffers
1876  */
1877 static void
1878 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1879 {
1880         struct lcs_card *card;
1881         struct lcs_header *lcs_hdr;
1882         __u16 offset;
1883
1884         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1885         lcs_hdr = (struct lcs_header *) buffer->data;
1886         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1887                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1888                 return;
1889         }
1890         card = (struct lcs_card *)
1891                 ((char *) channel - offsetof(struct lcs_card, read));
1892         offset = 0;
1893         while (lcs_hdr->offset != 0) {
1894                 if (lcs_hdr->offset <= 0 ||
1895                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1896                     lcs_hdr->offset < offset) {
1897                         /* Offset invalid. */
1898                         card->stats.rx_length_errors++;
1899                         card->stats.rx_errors++;
1900                         return;
1901                 }
1902                 /* What kind of frame is it? */
1903                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1904                         /* Control frame. */
1905                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1906                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1907                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1908                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1909                         /* Normal network packet. */
1910                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1911                                     lcs_hdr->offset - offset -
1912                                     sizeof(struct lcs_header));
1913                 else
1914                         /* Unknown frame type. */
1915                         ; // FIXME: error message ?
1916                 /* Proceed to next frame. */
1917                 offset = lcs_hdr->offset;
1918                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1919                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1920         }
1921         /* The buffer is now empty. Make it ready again. */
1922         lcs_ready_buffer(&card->read, buffer);
1923 }
1924
1925 /**
1926  * get network statistics for ifconfig and other user programs
1927  */
1928 static struct net_device_stats *
1929 lcs_getstats(struct net_device *dev)
1930 {
1931         struct lcs_card *card;
1932
1933         LCS_DBF_TEXT(4, trace, "netstats");
1934         card = (struct lcs_card *) dev->priv;
1935         return &card->stats;
1936 }
1937
1938 /**
1939  * stop lcs device
1940  * This function will be called by user doing ifconfig xxx down
1941  */
1942 static int
1943 lcs_stop_device(struct net_device *dev)
1944 {
1945         struct lcs_card *card;
1946         int rc;
1947
1948         LCS_DBF_TEXT(2, trace, "stopdev");
1949         card   = (struct lcs_card *) dev->priv;
1950         netif_stop_queue(dev);
1951         dev->flags &= ~IFF_UP;
1952         rc = lcs_stopcard(card);
1953         if (rc)
1954                 PRINT_ERR("Try it again!\n ");
1955         return rc;
1956 }
1957
1958 /**
1959  * start lcs device and make it runnable
1960  * This function will be called by user doing ifconfig xxx up
1961  */
1962 static int
1963 lcs_open_device(struct net_device *dev)
1964 {
1965         struct lcs_card *card;
1966         int rc;
1967
1968         LCS_DBF_TEXT(2, trace, "opendev");
1969         card = (struct lcs_card *) dev->priv;
1970         /* initialize statistics */
1971         rc = lcs_detect(card);
1972         if (rc) {
1973                 PRINT_ERR("LCS:Error in opening device!\n");
1974
1975         } else {
1976                 dev->flags |= IFF_UP;
1977                 netif_wake_queue(dev);
1978                 card->state = DEV_STATE_UP;
1979         }
1980         return rc;
1981 }
1982
1983 /**
1984  * show function for portno called by cat or similar things
1985  */
1986 static ssize_t
1987 lcs_portno_show (struct device *dev, char *buf)
1988 {
1989         struct lcs_card *card;
1990
1991         card = (struct lcs_card *)dev->driver_data;
1992
1993         if (!card)
1994                 return 0;
1995
1996         return sprintf(buf, "%d\n", card->portno);
1997 }
1998
1999 /**
2000  * store the value which is piped to file portno
2001  */
2002 static ssize_t
2003 lcs_portno_store (struct device *dev, const char *buf, size_t count)
2004 {
2005         struct lcs_card *card;
2006         int value;
2007
2008         card = (struct lcs_card *)dev->driver_data;
2009
2010         if (!card)
2011                 return 0;
2012
2013         sscanf(buf, "%u", &value);
2014         /* TODO: sanity checks */
2015         card->portno = value;
2016
2017         return count;
2018
2019 }
2020
2021 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
2022
2023 static ssize_t
2024 lcs_type_show(struct device *dev, char *buf)
2025 {
2026         struct ccwgroup_device *cgdev;
2027
2028         cgdev = to_ccwgroupdev(dev);
2029         if (!cgdev)
2030                 return -ENODEV;
2031
2032         return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
2033 }
2034
2035 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
2036
2037 static ssize_t
2038 lcs_timeout_show(struct device *dev, char *buf)
2039 {
2040         struct lcs_card *card;
2041
2042         card = (struct lcs_card *)dev->driver_data;
2043
2044         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
2045 }
2046
2047 static ssize_t
2048 lcs_timeout_store (struct device *dev, const char *buf, size_t count)
2049 {
2050         struct lcs_card *card;
2051         int value;
2052
2053         card = (struct lcs_card *)dev->driver_data;
2054
2055         if (!card)
2056                 return 0;
2057
2058         sscanf(buf, "%u", &value);
2059         /* TODO: sanity checks */
2060         card->lancmd_timeout = value;
2061
2062         return count;
2063
2064 }
2065
2066 DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2067
2068 static struct attribute * lcs_attrs[] = {
2069         &dev_attr_portno.attr,
2070         &dev_attr_type.attr,
2071         &dev_attr_lancmd_timeout.attr,
2072         NULL,
2073 };
2074
2075 static struct attribute_group lcs_attr_group = {
2076         .attrs = lcs_attrs,
2077 };
2078
2079 /**
2080  * lcs_probe_device is called on establishing a new ccwgroup_device.
2081  */
2082 static int
2083 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2084 {
2085         struct lcs_card *card;
2086         int ret;
2087
2088         if (!get_device(&ccwgdev->dev))
2089                 return -ENODEV;
2090
2091         LCS_DBF_TEXT(2, setup, "add_dev");
2092         card = lcs_alloc_card();
2093         if (!card) {
2094                 PRINT_ERR("Allocation of lcs card failed\n");
2095                 put_device(&ccwgdev->dev);
2096                 return -ENOMEM;
2097         }
2098         ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2099         if (ret) {
2100                 PRINT_ERR("Creating attributes failed");
2101                 lcs_free_card(card);
2102                 put_device(&ccwgdev->dev);
2103                 return ret;
2104         }
2105         ccwgdev->dev.driver_data = card;
2106         ccwgdev->cdev[0]->handler = lcs_irq;
2107         ccwgdev->cdev[1]->handler = lcs_irq;
2108         return 0;
2109 }
2110
2111 static int
2112 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2113 {
2114         struct lcs_card *card;
2115
2116         LCS_DBF_TEXT(2, setup, "regnetdv");
2117         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2118         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2119                 return 0;
2120         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2121         return register_netdev(card->dev);
2122 }
2123
2124 /**
2125  * lcs_new_device will be called by setting the group device online.
2126  */
2127
2128 static int
2129 lcs_new_device(struct ccwgroup_device *ccwgdev)
2130 {
2131         struct  lcs_card *card;
2132         struct net_device *dev=NULL;
2133         enum lcs_dev_states recover_state;
2134         int rc;
2135
2136         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2137         if (!card)
2138                 return -ENODEV;
2139
2140         LCS_DBF_TEXT(2, setup, "newdev");
2141         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2142         card->read.ccwdev  = ccwgdev->cdev[0];
2143         card->write.ccwdev = ccwgdev->cdev[1];
2144
2145         recover_state = card->state;
2146         ccw_device_set_online(card->read.ccwdev);
2147         ccw_device_set_online(card->write.ccwdev);
2148
2149         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2150
2151         lcs_setup_card(card);
2152         rc = lcs_detect(card);
2153         if (rc) {
2154                 LCS_DBF_TEXT(2, setup, "dtctfail");
2155                 PRINT_WARN("Detection of LCS card failed with return code "
2156                            "%d (0x%x)\n", rc, rc);
2157                 lcs_stopcard(card);
2158                 goto out;
2159         }
2160         if (card->dev) {
2161                 LCS_DBF_TEXT(2, setup, "samedev");
2162                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2163                 goto netdev_out;
2164         }
2165         switch (card->lan_type) {
2166 #ifdef CONFIG_NET_ETHERNET
2167         case LCS_FRAME_TYPE_ENET:
2168                 card->lan_type_trans = eth_type_trans;
2169                 dev = alloc_etherdev(0);
2170                 break;
2171 #endif
2172 #ifdef CONFIG_TR
2173         case LCS_FRAME_TYPE_TR:
2174                 card->lan_type_trans = tr_type_trans;
2175                 dev = alloc_trdev(0);
2176                 break;
2177 #endif
2178 #ifdef CONFIG_FDDI
2179         case LCS_FRAME_TYPE_FDDI:
2180                 card->lan_type_trans = fddi_type_trans;
2181                 dev = alloc_fddidev(0);
2182                 break;
2183 #endif
2184         default:
2185                 LCS_DBF_TEXT(3, setup, "errinit");
2186                 PRINT_ERR("LCS: Initialization failed\n");
2187                 PRINT_ERR("LCS: No device found!\n");
2188                 goto out;
2189         }
2190         if (!dev)
2191                 goto out;
2192         card->dev = dev;
2193         card->dev->priv = card;
2194         card->dev->open = lcs_open_device;
2195         card->dev->stop = lcs_stop_device;
2196         card->dev->hard_start_xmit = lcs_start_xmit;
2197         card->dev->get_stats = lcs_getstats;
2198         SET_MODULE_OWNER(dev);
2199         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2200 #ifdef CONFIG_IP_MULTICAST
2201         if (!lcs_check_multicast_support(card))
2202                 card->dev->set_multicast_list = lcs_set_multicast_list;
2203 #endif
2204 netdev_out:
2205         lcs_set_allowed_threads(card,0xffffffff);
2206         if (recover_state == DEV_STATE_RECOVER) {
2207                 lcs_set_multicast_list(card->dev);
2208                 card->dev->flags |= IFF_UP;
2209                 netif_wake_queue(card->dev);
2210                 card->state = DEV_STATE_UP;
2211         } else {
2212                 lcs_stopcard(card);
2213         }
2214
2215         if (lcs_register_netdev(ccwgdev) != 0)
2216                 goto out;
2217
2218         /* Print out supported assists: IPv6 */
2219         PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
2220                    (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2221                    "with" : "without");
2222         /* Print out supported assist: Multicast */
2223         PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
2224                    (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2225                    "with" : "without");
2226         return 0;
2227 out:
2228
2229         ccw_device_set_offline(card->read.ccwdev);
2230         ccw_device_set_offline(card->write.ccwdev);
2231         return -ENODEV;
2232 }
2233
2234 /**
2235  * lcs_shutdown_device, called when setting the group device offline.
2236  */
2237 static int
2238 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2239 {
2240         struct lcs_card *card;
2241         enum lcs_dev_states recover_state;
2242         int ret;
2243
2244         LCS_DBF_TEXT(3, setup, "shtdndev");
2245         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2246         if (!card)
2247                 return -ENODEV;
2248         lcs_set_allowed_threads(card, 0);
2249         if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2250                 return -ERESTARTSYS;
2251         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2252         recover_state = card->state;
2253
2254         ret = lcs_stop_device(card->dev);
2255         ret = ccw_device_set_offline(card->read.ccwdev);
2256         ret = ccw_device_set_offline(card->write.ccwdev);
2257         if (recover_state == DEV_STATE_UP) {
2258                 card->state = DEV_STATE_RECOVER;
2259         }
2260         if (ret)
2261                 return ret;
2262         return 0;
2263 }
2264
2265 /**
2266  * lcs_remove_device, free buffers and card
2267  */
2268 static void
2269 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2270 {
2271         struct lcs_card *card;
2272
2273         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2274         if (!card)
2275                 return;
2276
2277         PRINT_INFO("Removing lcs group device ....\n");
2278         LCS_DBF_TEXT(3, setup, "remdev");
2279         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2280         if (ccwgdev->state == CCWGROUP_ONLINE) {
2281                 lcs_shutdown_device(ccwgdev);
2282         }
2283         if (card->dev)
2284                 unregister_netdev(card->dev);
2285         sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2286         lcs_cleanup_card(card);
2287         lcs_free_card(card);
2288         put_device(&ccwgdev->dev);
2289 }
2290
2291 /**
2292  * LCS ccwgroup driver registration
2293  */
2294 static struct ccwgroup_driver lcs_group_driver = {
2295         .owner       = THIS_MODULE,
2296         .name        = "lcs",
2297         .max_slaves  = 2,
2298         .driver_id   = 0xD3C3E2,
2299         .probe       = lcs_probe_device,
2300         .remove      = lcs_remove_device,
2301         .set_online  = lcs_new_device,
2302         .set_offline = lcs_shutdown_device,
2303 };
2304
2305 /**
2306  *  LCS Module/Kernel initialization function
2307  */
2308 static int
2309 __init lcs_init_module(void)
2310 {
2311         int rc;
2312
2313         PRINT_INFO("Loading %s\n",version);
2314         rc = lcs_register_debug_facility();
2315         LCS_DBF_TEXT(0, setup, "lcsinit");
2316         if (rc) {
2317                 PRINT_ERR("Initialization failed\n");
2318                 return rc;
2319         }
2320
2321         rc = register_cu3088_discipline(&lcs_group_driver);
2322         if (rc) {
2323                 PRINT_ERR("Initialization failed\n");
2324                 return rc;
2325         }
2326
2327         return 0;
2328 }
2329
2330
2331 /**
2332  *  LCS module cleanup function
2333  */
2334 static void
2335 __exit lcs_cleanup_module(void)
2336 {
2337         PRINT_INFO("Terminating lcs module.\n");
2338         LCS_DBF_TEXT(0, trace, "cleanup");
2339         unregister_cu3088_discipline(&lcs_group_driver);
2340         lcs_unregister_debug_facility();
2341 }
2342
2343 module_init(lcs_init_module);
2344 module_exit(lcs_cleanup_module);
2345
2346 MODULE_AUTHOR("Frank Pavlic <pavlic@de.ibm.com>");
2347 MODULE_LICENSE("GPL");
2348