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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 /**
  58  * initialization string for output
  59  */
  60
  61 static char version[] __initdata = "LCS driver";
  62 static char debug_buffer[255];
  63
  64 /**
  65  * Some prototypes.
  66  */
  67 static void lcs_tasklet(unsigned long);
  68 static void lcs_start_kernel_thread(struct lcs_card *card);
  69 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
  70 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
  71
  72 /**
  73  * Debug Facility Stuff
  74  */
  75 static debug_info_t *lcs_dbf_setup;
  76 static debug_info_t *lcs_dbf_trace;
  77
  78 /**
  79  *  LCS Debug Facility functions
  80  */
  81 static void
  82 lcs_unregister_debug_facility(void)
  83 {
  84         if (lcs_dbf_setup)
  85                 debug_unregister(lcs_dbf_setup);
  86         if (lcs_dbf_trace)
  87                 debug_unregister(lcs_dbf_trace);
  88 }
  89
  90 static int
  91 lcs_register_debug_facility(void)
  92 {
  93         lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
  94         lcs_dbf_trace = debug_register("lcs_trace", 2, 2, 8);
  95         if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
  96                 PRINT_ERR("Not enough memory for debug facility.\n");
  97                 lcs_unregister_debug_facility();
  98                 return -ENOMEM;
  99         }
 100         debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
 101         debug_set_level(lcs_dbf_setup, 4);
 102         debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
 103         debug_set_level(lcs_dbf_trace, 4);
 104         return 0;
 105 }
 106
 107 /**
 108  * Allocate io buffers.
 109  */
 110 static int
 111 lcs_alloc_channel(struct lcs_channel *channel)
 112 {
 113         int cnt;
 114
 115         LCS_DBF_TEXT(2, setup, "ichalloc");
 116         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 117                 /* alloc memory fo iobuffer */
 118                 channel->iob[cnt].data = (void *)
 119                         kmalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
 120                 if (channel->iob[cnt].data == NULL)
 121                         break;
 122                 memset(channel->iob[cnt].data, 0, LCS_IOBUFFERSIZE);
 123                 channel->iob[cnt].state = BUF_STATE_EMPTY;
 124         }
 125         if (cnt < LCS_NUM_BUFFS) {
 126                 /* Not all io buffers could be allocated. */
 127                 LCS_DBF_TEXT(2, setup, "echalloc");
 128                 while (cnt-- > 0)
 129                         kfree(channel->iob[cnt].data);
 130                 return -ENOMEM;
 131         }
 132         return 0;
 133 }
 134
 135 /**
 136  * Free io buffers.
 137  */
 138 static void
 139 lcs_free_channel(struct lcs_channel *channel)
 140 {
 141         int cnt;
 142
 143         LCS_DBF_TEXT(2, setup, "ichfree");
 144         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 145                 kfree(channel->iob[cnt].data);
 146                 channel->iob[cnt].data = NULL;
 147         }
 148 }
 149
 150 /*
 151  * Cleanup channel.
 152  */
 153 static void
 154 lcs_cleanup_channel(struct lcs_channel *channel)
 155 {
 156         LCS_DBF_TEXT(3, setup, "cleanch");
 157         /* Kill write channel tasklets. */
 158         tasklet_kill(&channel->irq_tasklet);
 159         /* Free channel buffers. */
 160         lcs_free_channel(channel);
 161 }
 162
 163 /**
 164  * LCS free memory for card and channels.
 165  */
 166 static void
 167 lcs_free_card(struct lcs_card *card)
 168 {
 169         LCS_DBF_TEXT(2, setup, "remcard");
 170         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 171         kfree(card);
 172 }
 173
 174 /**
 175  * LCS alloc memory for card and channels
 176  */
 177 static struct lcs_card *
 178 lcs_alloc_card(void)
 179 {
 180         struct lcs_card *card;
 181         int rc;
 182
 183         LCS_DBF_TEXT(2, setup, "alloclcs");
 184
 185         card = kmalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
 186         if (card == NULL)
 187                 return NULL;
 188         memset(card, 0, sizeof(struct lcs_card));
 189         card->lan_type = LCS_FRAME_TYPE_AUTO;
 190         card->pkt_seq = 0;
 191         card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
 192         /* Allocate io buffers for the read channel. */
 193         rc = lcs_alloc_channel(&card->read);
 194         if (rc){
 195                 LCS_DBF_TEXT(2, setup, "iccwerr");
 196                 lcs_free_card(card);
 197                 return NULL;
 198         }
 199         /* Allocate io buffers for the write channel. */
 200         rc = lcs_alloc_channel(&card->write);
 201         if (rc) {
 202                 LCS_DBF_TEXT(2, setup, "iccwerr");
 203                 lcs_cleanup_channel(&card->read);
 204                 lcs_free_card(card);
 205                 return NULL;
 206         }
 207
 208 #ifdef CONFIG_IP_MULTICAST
 209         INIT_LIST_HEAD(&card->ipm_list);
 210 #endif
 211         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 212         return card;
 213 }
 214
 215 /*
 216  * Setup read channel.
 217  */
 218 static void
 219 lcs_setup_read_ccws(struct lcs_card *card)
 220 {
 221         int cnt;
 222
 223         LCS_DBF_TEXT(2, setup, "ireadccw");
 224         /* Setup read ccws. */
 225         memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
 226         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 227                 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
 228                 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
 229                 card->read.ccws[cnt].flags =
 230                         CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
 231                 /*
 232                  * Note: we have allocated the buffer with GFP_DMA, so
 233                  * we do not need to do set_normalized_cda.
 234                  */
 235                 card->read.ccws[cnt].cda =
 236                         (__u32) __pa(card->read.iob[cnt].data);
 237                 ((struct lcs_header *)
 238                  card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
 239                 card->read.iob[cnt].callback = lcs_get_frames_cb;
 240                 card->read.iob[cnt].state = BUF_STATE_READY;
 241                 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
 242         }
 243         card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
 244         card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
 245         card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
 246         /* Last ccw is a tic (transfer in channel). */
 247         card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 248         card->read.ccws[LCS_NUM_BUFFS].cda =
 249                 (__u32) __pa(card->read.ccws);
 250         /* Setg initial state of the read channel. */
 251         card->read.state = CH_STATE_INIT;
 252
 253         card->read.io_idx = 0;
 254         card->read.buf_idx = 0;
 255 }
 256
 257 static void
 258 lcs_setup_read(struct lcs_card *card)
 259 {
 260         LCS_DBF_TEXT(3, setup, "initread");
 261
 262         lcs_setup_read_ccws(card);
 263         /* Initialize read channel tasklet. */
 264         card->read.irq_tasklet.data = (unsigned long) &card->read;
 265         card->read.irq_tasklet.func = lcs_tasklet;
 266         /* Initialize waitqueue. */
 267         init_waitqueue_head(&card->read.wait_q);
 268 }
 269
 270 /*
 271  * Setup write channel.
 272  */
 273 static void
 274 lcs_setup_write_ccws(struct lcs_card *card)
 275 {
 276         int cnt;
 277
 278         LCS_DBF_TEXT(3, setup, "iwritccw");
 279         /* Setup write ccws. */
 280         memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
 281         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 282                 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
 283                 card->write.ccws[cnt].count = 0;
 284                 card->write.ccws[cnt].flags =
 285                         CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
 286                 /*
 287                  * Note: we have allocated the buffer with GFP_DMA, so
 288                  * we do not need to do set_normalized_cda.
 289                  */
 290                 card->write.ccws[cnt].cda =
 291                         (__u32) __pa(card->write.iob[cnt].data);
 292         }
 293         /* Last ccw is a tic (transfer in channel). */
 294         card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 295         card->write.ccws[LCS_NUM_BUFFS].cda =
 296                 (__u32) __pa(card->write.ccws);
 297         /* Set initial state of the write channel. */
 298         card->read.state = CH_STATE_INIT;
 299
 300         card->write.io_idx = 0;
 301         card->write.buf_idx = 0;
 302 }
 303
 304 static void
 305 lcs_setup_write(struct lcs_card *card)
 306 {
 307         LCS_DBF_TEXT(3, setup, "initwrit");
 308
 309         lcs_setup_write_ccws(card);
 310         /* Initialize write channel tasklet. */
 311         card->write.irq_tasklet.data = (unsigned long) &card->write;
 312         card->write.irq_tasklet.func = lcs_tasklet;
 313         /* Initialize waitqueue. */
 314         init_waitqueue_head(&card->write.wait_q);
 315 }
 316
 317 static void
 318 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
 319 {
 320         unsigned long flags;
 321
 322         spin_lock_irqsave(&card->mask_lock, flags);
 323         card->thread_allowed_mask = threads;
 324         spin_unlock_irqrestore(&card->mask_lock, flags);
 325         wake_up(&card->wait_q);
 326 }
 327 static inline int
 328 lcs_threads_running(struct lcs_card *card, unsigned long threads)
 329 {
 330         unsigned long flags;
 331         int rc = 0;
 332
 333         spin_lock_irqsave(&card->mask_lock, flags);
 334         rc = (card->thread_running_mask & threads);
 335         spin_unlock_irqrestore(&card->mask_lock, flags);
 336         return rc;
 337 }
 338
 339 static int
 340 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
 341 {
 342         return wait_event_interruptible(card->wait_q,
 343                         lcs_threads_running(card, threads) == 0);
 344 }
 345
 346 static inline int
 347 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
 348 {
 349         unsigned long flags;
 350
 351         spin_lock_irqsave(&card->mask_lock, flags);
 352         if ( !(card->thread_allowed_mask & thread) ||
 353               (card->thread_start_mask & thread) ) {
 354                 spin_unlock_irqrestore(&card->mask_lock, flags);
 355                 return -EPERM;
 356         }
 357         card->thread_start_mask |= thread;
 358         spin_unlock_irqrestore(&card->mask_lock, flags);
 359         return 0;
 360 }
 361
 362 static void
 363 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
 364 {
 365         unsigned long flags;
 366
 367         spin_lock_irqsave(&card->mask_lock, flags);
 368         card->thread_running_mask &= ~thread;
 369         spin_unlock_irqrestore(&card->mask_lock, flags);
 370         wake_up(&card->wait_q);
 371 }
 372
 373 static inline int
 374 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 375 {
 376         unsigned long flags;
 377         int rc = 0;
 378
 379         spin_lock_irqsave(&card->mask_lock, flags);
 380         if (card->thread_start_mask & thread){
 381                 if ((card->thread_allowed_mask & thread) &&
 382                     !(card->thread_running_mask & thread)){
 383                         rc = 1;
 384                         card->thread_start_mask &= ~thread;
 385                         card->thread_running_mask |= thread;
 386                 } else
 387                         rc = -EPERM;
 388         }
 389         spin_unlock_irqrestore(&card->mask_lock, flags);
 390         return rc;
 391 }
 392
 393 static int
 394 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 395 {
 396         int rc = 0;
 397         wait_event(card->wait_q,
 398                    (rc = __lcs_do_run_thread(card, thread)) >= 0);
 399         return rc;
 400 }
 401
 402 static int
 403 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
 404 {
 405         unsigned long flags;
 406         int rc = 0;
 407
 408         spin_lock_irqsave(&card->mask_lock, flags);
 409         LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
 410                         (u8) card->thread_start_mask,
 411                         (u8) card->thread_allowed_mask,
 412                         (u8) card->thread_running_mask);
 413         rc = (card->thread_start_mask & thread);
 414         spin_unlock_irqrestore(&card->mask_lock, flags);
 415         return rc;
 416 }
 417
 418 /**
 419  * Initialize channels,card and state machines.
 420  */
 421 static void
 422 lcs_setup_card(struct lcs_card *card)
 423 {
 424         LCS_DBF_TEXT(2, setup, "initcard");
 425         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 426
 427         lcs_setup_read(card);
 428         lcs_setup_write(card);
 429         /* Set cards initial state. */
 430         card->state = DEV_STATE_DOWN;
 431         card->tx_buffer = NULL;
 432         card->tx_emitted = 0;
 433
 434         /* Initialize kernel thread task used for LGW commands. */
 435         INIT_WORK(&card->kernel_thread_starter,
 436                   (void *)lcs_start_kernel_thread,card);
 437         card->thread_start_mask = 0;
 438         card->thread_allowed_mask = 0;
 439         card->thread_running_mask = 0;
 440         init_waitqueue_head(&card->wait_q);
 441         spin_lock_init(&card->lock);
 442         spin_lock_init(&card->ipm_lock);
 443         spin_lock_init(&card->mask_lock);
 444 #ifdef CONFIG_IP_MULTICAST
 445         INIT_LIST_HEAD(&card->ipm_list);
 446 #endif
 447         INIT_LIST_HEAD(&card->lancmd_waiters);
 448 }
 449
 450 static inline void
 451 lcs_clear_multicast_list(struct lcs_card *card)
 452 {
 453 #ifdef  CONFIG_IP_MULTICAST
 454         struct lcs_ipm_list *ipm;
 455         unsigned long flags;
 456
 457         /* Free multicast list. */
 458         LCS_DBF_TEXT(3, setup, "clmclist");
 459         spin_lock_irqsave(&card->ipm_lock, flags);
 460         while (!list_empty(&card->ipm_list)){
 461                 ipm = list_entry(card->ipm_list.next,
 462                                  struct lcs_ipm_list, list);
 463                 list_del(&ipm->list);
 464                 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
 465                         spin_unlock_irqrestore(&card->ipm_lock, flags);
 466                         lcs_send_delipm(card, ipm);
 467                         spin_lock_irqsave(&card->ipm_lock, flags);
 468                 }
 469                 kfree(ipm);
 470         }
 471         spin_unlock_irqrestore(&card->ipm_lock, flags);
 472 #endif
 473 }
 474 /**
 475  * Cleanup channels,card and state machines.
 476  */
 477 static void
 478 lcs_cleanup_card(struct lcs_card *card)
 479 {
 480
 481         LCS_DBF_TEXT(3, setup, "cleancrd");
 482         LCS_DBF_HEX(2,setup,&card,sizeof(void*));
 483
 484         if (card->dev != NULL)
 485                 free_netdev(card->dev);
 486         /* Cleanup channels. */
 487         lcs_cleanup_channel(&card->write);
 488         lcs_cleanup_channel(&card->read);
 489 }
 490
 491 /**
 492  * Start channel.
 493  */
 494 static int
 495 lcs_start_channel(struct lcs_channel *channel)
 496 {
 497         unsigned long flags;
 498         int rc;
 499
 500         LCS_DBF_TEXT_(4,trace,"ssch%s", channel->ccwdev->dev.bus_id);
 501         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 502         rc = ccw_device_start(channel->ccwdev,
 503                               channel->ccws + channel->io_idx, 0, 0,
 504                               DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
 505         if (rc == 0)
 506                 channel->state = CH_STATE_RUNNING;
 507         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 508         if (rc) {
 509                 LCS_DBF_TEXT_(4,trace,"essh%s", channel->ccwdev->dev.bus_id);
 510                 PRINT_ERR("Error in starting channel, rc=%d!\n", rc);
 511         }
 512         return rc;
 513 }
 514
 515 static int
 516 lcs_clear_channel(struct lcs_channel *channel)
 517 {
 518         unsigned long flags;
 519         int rc;
 520
 521         LCS_DBF_TEXT(4,trace,"clearch");
 522         LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
 523         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 524         rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
 525         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 526         if (rc) {
 527                 LCS_DBF_TEXT_(4,trace,"ecsc%s", channel->ccwdev->dev.bus_id);
 528                 return rc;
 529         }
 530         wait_event(channel->wait_q, (channel->state == CH_STATE_CLEARED));
 531         channel->state = CH_STATE_STOPPED;
 532         return rc;
 533 }
 534
 535
 536 /**
 537  * Stop channel.
 538  */
 539 static int
 540 lcs_stop_channel(struct lcs_channel *channel)
 541 {
 542         unsigned long flags;
 543         int rc;
 544
 545         if (channel->state == CH_STATE_STOPPED)
 546                 return 0;
 547         LCS_DBF_TEXT(4,trace,"haltsch");
 548         LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
 549         channel->state = CH_STATE_INIT;
 550         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 551         rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
 552         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 553         if (rc) {
 554                 LCS_DBF_TEXT_(4,trace,"ehsc%s", channel->ccwdev->dev.bus_id);
 555                 return rc;
 556         }
 557         /* Asynchronous halt initialted. Wait for its completion. */
 558         wait_event(channel->wait_q, (channel->state == CH_STATE_HALTED));
 559         lcs_clear_channel(channel);
 560         return 0;
 561 }
 562
 563 /**
 564  * start read and write channel
 565  */
 566 static int
 567 lcs_start_channels(struct lcs_card *card)
 568 {
 569         int rc;
 570
 571         LCS_DBF_TEXT(2, trace, "chstart");
 572         /* start read channel */
 573         rc = lcs_start_channel(&card->read);
 574         if (rc)
 575                 return rc;
 576         /* start write channel */
 577         rc = lcs_start_channel(&card->write);
 578         if (rc)
 579                 lcs_stop_channel(&card->read);
 580         return rc;
 581 }
 582
 583 /**
 584  * stop read and write channel
 585  */
 586 static int
 587 lcs_stop_channels(struct lcs_card *card)
 588 {
 589         LCS_DBF_TEXT(2, trace, "chhalt");
 590         lcs_stop_channel(&card->read);
 591         lcs_stop_channel(&card->write);
 592         return 0;
 593 }
 594
 595 /**
 596  * Get empty buffer.
 597  */
 598 static struct lcs_buffer *
 599 __lcs_get_buffer(struct lcs_channel *channel)
 600 {
 601         int index;
 602
 603         LCS_DBF_TEXT(5, trace, "_getbuff");
 604         index = channel->io_idx;
 605         do {
 606                 if (channel->iob[index].state == BUF_STATE_EMPTY) {
 607                         channel->iob[index].state = BUF_STATE_LOCKED;
 608                         return channel->iob + index;
 609                 }
 610                 index = (index + 1) & (LCS_NUM_BUFFS - 1);
 611         } while (index != channel->io_idx);
 612         return NULL;
 613 }
 614
 615 static struct lcs_buffer *
 616 lcs_get_buffer(struct lcs_channel *channel)
 617 {
 618         struct lcs_buffer *buffer;
 619         unsigned long flags;
 620
 621         LCS_DBF_TEXT(5, trace, "getbuff");
 622         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 623         buffer = __lcs_get_buffer(channel);
 624         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 625         return buffer;
 626 }
 627
 628 /**
 629  * Resume channel program if the channel is suspended.
 630  */
 631 static int
 632 __lcs_resume_channel(struct lcs_channel *channel)
 633 {
 634         int rc;
 635
 636         if (channel->state != CH_STATE_SUSPENDED)
 637                 return 0;
 638         if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
 639                 return 0;
 640         LCS_DBF_TEXT_(5, trace, "rsch%s", channel->ccwdev->dev.bus_id);
 641         rc = ccw_device_resume(channel->ccwdev);
 642         if (rc) {
 643                 LCS_DBF_TEXT_(4, trace, "ersc%s", channel->ccwdev->dev.bus_id);
 644                 PRINT_ERR("Error in lcs_resume_channel: rc=%d\n",rc);
 645         } else
 646                 channel->state = CH_STATE_RUNNING;
 647         return rc;
 648
 649 }
 650
 651 /**
 652  * Make a buffer ready for processing.
 653  */
 654 static inline void
 655 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
 656 {
 657         int prev, next;
 658
 659         LCS_DBF_TEXT(5, trace, "rdybits");
 660         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 661         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 662         /* Check if we may clear the suspend bit of this buffer. */
 663         if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
 664                 /* Check if we have to set the PCI bit. */
 665                 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
 666                         /* Suspend bit of the previous buffer is not set. */
 667                         channel->ccws[index].flags |= CCW_FLAG_PCI;
 668                 /* Suspend bit of the next buffer is set. */
 669                 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
 670         }
 671 }
 672
 673 static int
 674 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 675 {
 676         unsigned long flags;
 677         int index, rc;
 678
 679         LCS_DBF_TEXT(5, trace, "rdybuff");
 680         if (buffer->state != BUF_STATE_LOCKED &&
 681             buffer->state != BUF_STATE_PROCESSED)
 682                 BUG();
 683         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 684         buffer->state = BUF_STATE_READY;
 685         index = buffer - channel->iob;
 686         /* Set length. */
 687         channel->ccws[index].count = buffer->count;
 688         /* Check relevant PCI/suspend bits. */
 689         __lcs_ready_buffer_bits(channel, index);
 690         rc = __lcs_resume_channel(channel);
 691         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 692         return rc;
 693 }
 694
 695 /**
 696  * Mark the buffer as processed. Take care of the suspend bit
 697  * of the previous buffer. This function is called from
 698  * interrupt context, so the lock must not be taken.
 699  */
 700 static int
 701 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 702 {
 703         int index, prev, next;
 704
 705         LCS_DBF_TEXT(5, trace, "prcsbuff");
 706         if (buffer->state != BUF_STATE_READY)
 707                 BUG();
 708         buffer->state = BUF_STATE_PROCESSED;
 709         index = buffer - channel->iob;
 710         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 711         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 712         /* Set the suspend bit and clear the PCI bit of this buffer. */
 713         channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
 714         channel->ccws[index].flags &= ~CCW_FLAG_PCI;
 715         /* Check the suspend bit of the previous buffer. */
 716         if (channel->iob[prev].state == BUF_STATE_READY) {
 717                 /*
 718                  * Previous buffer is in state ready. It might have
 719                  * happened in lcs_ready_buffer that the suspend bit
 720                  * has not been cleared to avoid an endless loop.
 721                  * Do it now.
 722                  */
 723                 __lcs_ready_buffer_bits(channel, prev);
 724         }
 725         /* Clear PCI bit of next buffer. */
 726         channel->ccws[next].flags &= ~CCW_FLAG_PCI;
 727         return __lcs_resume_channel(channel);
 728 }
 729
 730 /**
 731  * Put a processed buffer back to state empty.
 732  */
 733 static void
 734 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 735 {
 736         unsigned long flags;
 737
 738         LCS_DBF_TEXT(5, trace, "relbuff");
 739         if (buffer->state != BUF_STATE_LOCKED &&
 740             buffer->state != BUF_STATE_PROCESSED)
 741                 BUG();
 742         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 743         buffer->state = BUF_STATE_EMPTY;
 744         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 745 }
 746
 747 /**
 748  * Get buffer for a lan command.
 749  */
 750 static struct lcs_buffer *
 751 lcs_get_lancmd(struct lcs_card *card, int count)
 752 {
 753         struct lcs_buffer *buffer;
 754         struct lcs_cmd *cmd;
 755
 756         LCS_DBF_TEXT(4, trace, "getlncmd");
 757         /* Get buffer and wait if none is available. */
 758         wait_event(card->write.wait_q,
 759                    ((buffer = lcs_get_buffer(&card->write)) != NULL));
 760         count += sizeof(struct lcs_header);
 761         *(__u16 *)(buffer->data + count) = 0;
 762         buffer->count = count + sizeof(__u16);
 763         buffer->callback = lcs_release_buffer;
 764         cmd = (struct lcs_cmd *) buffer->data;
 765         cmd->offset = count;
 766         cmd->type = LCS_FRAME_TYPE_CONTROL;
 767         cmd->slot = 0;
 768         return buffer;
 769 }
 770
 771
 772 static void
 773 lcs_get_reply(struct lcs_reply *reply)
 774 {
 775         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 776         atomic_inc(&reply->refcnt);
 777 }
 778
 779 static void
 780 lcs_put_reply(struct lcs_reply *reply)
 781 {
 782         WARN_ON(atomic_read(&reply->refcnt) <= 0);
 783         if (atomic_dec_and_test(&reply->refcnt)) {
 784                 kfree(reply);
 785         }
 786
 787 }
 788
 789 static struct lcs_reply *
 790 lcs_alloc_reply(struct lcs_cmd *cmd)
 791 {
 792         struct lcs_reply *reply;
 793
 794         LCS_DBF_TEXT(4, trace, "getreply");
 795
 796         reply = kmalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
 797         if (!reply)
 798                 return NULL;
 799         memset(reply,0,sizeof(struct lcs_reply));
 800         atomic_set(&reply->refcnt,1);
 801         reply->sequence_no = cmd->sequence_no;
 802         reply->received = 0;
 803         reply->rc = 0;
 804         init_waitqueue_head(&reply->wait_q);
 805
 806         return reply;
 807 }
 808
 809 /**
 810  * Notifier function for lancmd replies. Called from read irq.
 811  */
 812 static void
 813 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
 814 {
 815         struct list_head *l, *n;
 816         struct lcs_reply *reply;
 817
 818         LCS_DBF_TEXT(4, trace, "notiwait");
 819         spin_lock(&card->lock);
 820         list_for_each_safe(l, n, &card->lancmd_waiters) {
 821                 reply = list_entry(l, struct lcs_reply, list);
 822                 if (reply->sequence_no == cmd->sequence_no) {
 823                         lcs_get_reply(reply);
 824                         list_del_init(&reply->list);
 825                         if (reply->callback != NULL)
 826                                 reply->callback(card, cmd);
 827                         reply->received = 1;
 828                         reply->rc = cmd->return_code;
 829                         wake_up(&reply->wait_q);
 830                         lcs_put_reply(reply);
 831                         break;
 832                 }
 833         }
 834         spin_unlock(&card->lock);
 835 }
 836
 837 /**
 838  * Emit buffer of a lan comand.
 839  */
 840 void
 841 lcs_lancmd_timeout(unsigned long data)
 842 {
 843         struct lcs_reply *reply, *list_reply, *r;
 844         unsigned long flags;
 845
 846         LCS_DBF_TEXT(4, trace, "timeout");
 847         reply = (struct lcs_reply *) data;
 848         spin_lock_irqsave(&reply->card->lock, flags);
 849         list_for_each_entry_safe(list_reply, r,
 850                                  &reply->card->lancmd_waiters,list) {
 851                 if (reply == list_reply) {
 852                         lcs_get_reply(reply);
 853                         list_del_init(&reply->list);
 854                         spin_unlock_irqrestore(&reply->card->lock, flags);
 855                         reply->received = 1;
 856                         reply->rc = -ETIME;
 857                         wake_up(&reply->wait_q);
 858                         lcs_put_reply(reply);
 859                         return;
 860                 }
 861         }
 862         spin_unlock_irqrestore(&reply->card->lock, flags);
 863 }
 864
 865 static int
 866 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
 867                 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
 868 {
 869         struct lcs_reply *reply;
 870         struct lcs_cmd *cmd;
 871         struct timer_list timer;
 872         unsigned long flags;
 873         int rc;
 874
 875         LCS_DBF_TEXT(4, trace, "sendcmd");
 876         cmd = (struct lcs_cmd *) buffer->data;
 877         cmd->return_code = 0;
 878         cmd->sequence_no = card->sequence_no++;
 879         reply = lcs_alloc_reply(cmd);
 880         if (!reply)
 881                 return -ENOMEM;
 882         reply->callback = reply_callback;
 883         reply->card = card;
 884         spin_lock_irqsave(&card->lock, flags);
 885         list_add_tail(&reply->list, &card->lancmd_waiters);
 886         spin_unlock_irqrestore(&card->lock, flags);
 887
 888         buffer->callback = lcs_release_buffer;
 889         rc = lcs_ready_buffer(&card->write, buffer);
 890         if (rc)
 891                 return rc;
 892         init_timer(&timer);
 893         timer.function = lcs_lancmd_timeout;
 894         timer.data = (unsigned long) reply;
 895         timer.expires = jiffies + HZ*card->lancmd_timeout;
 896         add_timer(&timer);
 897         wait_event(reply->wait_q, reply->received);
 898         del_timer_sync(&timer);
 899         LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
 900         rc = reply->rc;
 901         lcs_put_reply(reply);
 902         return rc ? -EIO : 0;
 903 }
 904
 905 /**
 906  * LCS startup command
 907  */
 908 static int
 909 lcs_send_startup(struct lcs_card *card, __u8 initiator)
 910 {
 911         struct lcs_buffer *buffer;
 912         struct lcs_cmd *cmd;
 913
 914         LCS_DBF_TEXT(2, trace, "startup");
 915         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 916         cmd = (struct lcs_cmd *) buffer->data;
 917         cmd->cmd_code = LCS_CMD_STARTUP;
 918         cmd->initiator = initiator;
 919         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
 920         return lcs_send_lancmd(card, buffer, NULL);
 921 }
 922
 923 /**
 924  * LCS shutdown command
 925  */
 926 static int
 927 lcs_send_shutdown(struct lcs_card *card)
 928 {
 929         struct lcs_buffer *buffer;
 930         struct lcs_cmd *cmd;
 931
 932         LCS_DBF_TEXT(2, trace, "shutdown");
 933         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 934         cmd = (struct lcs_cmd *) buffer->data;
 935         cmd->cmd_code = LCS_CMD_SHUTDOWN;
 936         cmd->initiator = LCS_INITIATOR_TCPIP;
 937         return lcs_send_lancmd(card, buffer, NULL);
 938 }
 939
 940 /**
 941  * LCS lanstat command
 942  */
 943 static void
 944 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 945 {
 946         LCS_DBF_TEXT(2, trace, "statcb");
 947         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
 948 }
 949
 950 static int
 951 lcs_send_lanstat(struct lcs_card *card)
 952 {
 953         struct lcs_buffer *buffer;
 954         struct lcs_cmd *cmd;
 955
 956         LCS_DBF_TEXT(2,trace, "cmdstat");
 957         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 958         cmd = (struct lcs_cmd *) buffer->data;
 959         /* Setup lanstat command. */
 960         cmd->cmd_code = LCS_CMD_LANSTAT;
 961         cmd->initiator = LCS_INITIATOR_TCPIP;
 962         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 963         cmd->cmd.lcs_std_cmd.portno = card->portno;
 964         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
 965 }
 966
 967 /**
 968  * send stoplan command
 969  */
 970 static int
 971 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
 972 {
 973         struct lcs_buffer *buffer;
 974         struct lcs_cmd *cmd;
 975
 976         LCS_DBF_TEXT(2, trace, "cmdstpln");
 977         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 978         cmd = (struct lcs_cmd *) buffer->data;
 979         cmd->cmd_code = LCS_CMD_STOPLAN;
 980         cmd->initiator = initiator;
 981         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 982         cmd->cmd.lcs_std_cmd.portno = card->portno;
 983         return lcs_send_lancmd(card, buffer, NULL);
 984 }
 985
 986 /**
 987  * send startlan command
 988  */
 989 static void
 990 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 991 {
 992         LCS_DBF_TEXT(2, trace, "srtlancb");
 993         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
 994         card->portno = cmd->cmd.lcs_std_cmd.portno;
 995 }
 996
 997 static int
 998 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
 999 {
1000         struct lcs_buffer *buffer;
1001         struct lcs_cmd *cmd;
1002
1003         LCS_DBF_TEXT(2, trace, "cmdstaln");
1004         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1005         cmd = (struct lcs_cmd *) buffer->data;
1006         cmd->cmd_code = LCS_CMD_STARTLAN;
1007         cmd->initiator = initiator;
1008         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1009         cmd->cmd.lcs_std_cmd.portno = card->portno;
1010         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1011 }
1012
1013 #ifdef CONFIG_IP_MULTICAST
1014 /**
1015  * send setipm command (Multicast)
1016  */
1017 static int
1018 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1019 {
1020         struct lcs_buffer *buffer;
1021         struct lcs_cmd *cmd;
1022
1023         LCS_DBF_TEXT(2, trace, "cmdsetim");
1024         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1025         cmd = (struct lcs_cmd *) buffer->data;
1026         cmd->cmd_code = LCS_CMD_SETIPM;
1027         cmd->initiator = LCS_INITIATOR_TCPIP;
1028         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1029         cmd->cmd.lcs_qipassist.portno = card->portno;
1030         cmd->cmd.lcs_qipassist.version = 4;
1031         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1032         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1033                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1034         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1035         return lcs_send_lancmd(card, buffer, NULL);
1036 }
1037
1038 /**
1039  * send delipm command (Multicast)
1040  */
1041 static int
1042 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1043 {
1044         struct lcs_buffer *buffer;
1045         struct lcs_cmd *cmd;
1046
1047         LCS_DBF_TEXT(2, trace, "cmddelim");
1048         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1049         cmd = (struct lcs_cmd *) buffer->data;
1050         cmd->cmd_code = LCS_CMD_DELIPM;
1051         cmd->initiator = LCS_INITIATOR_TCPIP;
1052         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1053         cmd->cmd.lcs_qipassist.portno = card->portno;
1054         cmd->cmd.lcs_qipassist.version = 4;
1055         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1056         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1057                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1058         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1059         return lcs_send_lancmd(card, buffer, NULL);
1060 }
1061
1062 /**
1063  * check if multicast is supported by LCS
1064  */
1065 static void
1066 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1067 {
1068         LCS_DBF_TEXT(2, trace, "chkmccb");
1069         card->ip_assists_supported =
1070                 cmd->cmd.lcs_qipassist.ip_assists_supported;
1071         card->ip_assists_enabled =
1072                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1073 }
1074
1075 static int
1076 lcs_check_multicast_support(struct lcs_card *card)
1077 {
1078         struct lcs_buffer *buffer;
1079         struct lcs_cmd *cmd;
1080         int rc;
1081
1082         LCS_DBF_TEXT(2, trace, "cmdqipa");
1083         /* Send query ipassist. */
1084         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1085         cmd = (struct lcs_cmd *) buffer->data;
1086         cmd->cmd_code = LCS_CMD_QIPASSIST;
1087         cmd->initiator = LCS_INITIATOR_TCPIP;
1088         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1089         cmd->cmd.lcs_qipassist.portno = card->portno;
1090         cmd->cmd.lcs_qipassist.version = 4;
1091         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1092         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1093         if (rc != 0) {
1094                 PRINT_ERR("Query IPAssist failed. Assuming unsupported!\n");
1095                 return -EOPNOTSUPP;
1096         }
1097         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1098                 return 0;
1099         return -EOPNOTSUPP;
1100 }
1101
1102 /**
1103  * set or del multicast address on LCS card
1104  */
1105 static void
1106 lcs_fix_multicast_list(struct lcs_card *card)
1107 {
1108         struct list_head failed_list;
1109         struct lcs_ipm_list *ipm, *tmp;
1110         unsigned long flags;
1111         int rc;
1112
1113         LCS_DBF_TEXT(4,trace, "fixipm");
1114         INIT_LIST_HEAD(&failed_list);
1115         spin_lock_irqsave(&card->ipm_lock, flags);
1116 list_modified:
1117         list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1118                 switch (ipm->ipm_state) {
1119                 case LCS_IPM_STATE_SET_REQUIRED:
1120                         /* del from ipm_list so noone else can tamper with
1121                          * this entry */
1122                         list_del_init(&ipm->list);
1123                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1124                         rc = lcs_send_setipm(card, ipm);
1125                         spin_lock_irqsave(&card->ipm_lock, flags);
1126                         if (rc) {
1127                                 PRINT_INFO("Adding multicast address failed."
1128                                            "Table possibly full!\n");
1129                                 /* store ipm in failed list -> will be added
1130                                  * to ipm_list again, so a retry will be done
1131                                  * during the next call of this function */
1132                                 list_add_tail(&ipm->list, &failed_list);
1133                         } else {
1134                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1135                                 /* re-insert into ipm_list */
1136                                 list_add_tail(&ipm->list, &card->ipm_list);
1137                         }
1138                         goto list_modified;
1139                 case LCS_IPM_STATE_DEL_REQUIRED:
1140                         list_del(&ipm->list);
1141                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1142                         lcs_send_delipm(card, ipm);
1143                         spin_lock_irqsave(&card->ipm_lock, flags);
1144                         kfree(ipm);
1145                         goto list_modified;
1146                 case LCS_IPM_STATE_ON_CARD:
1147                         break;
1148                 }
1149         }
1150         /* re-insert all entries from the failed_list into ipm_list */
1151         list_for_each_entry_safe(ipm, tmp, &failed_list, list) {
1152                 list_del_init(&ipm->list);
1153                 list_add_tail(&ipm->list, &card->ipm_list);
1154         }
1155         spin_unlock_irqrestore(&card->ipm_lock, flags);
1156         if (card->state == DEV_STATE_UP)
1157                 netif_wake_queue(card->dev);
1158 }
1159
1160 /**
1161  * get mac address for the relevant Multicast address
1162  */
1163 static void
1164 lcs_get_mac_for_ipm(__u32 ipm, char *mac, struct net_device *dev)
1165 {
1166         LCS_DBF_TEXT(4,trace, "getmac");
1167         if (dev->type == ARPHRD_IEEE802_TR)
1168                 ip_tr_mc_map(ipm, mac);
1169         else
1170                 ip_eth_mc_map(ipm, mac);
1171 }
1172
1173 /**
1174  * function called by net device to handle multicast address relevant things
1175  */
1176 static inline void
1177 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1178 {
1179         struct ip_mc_list *im4;
1180         struct list_head *l;
1181         struct lcs_ipm_list *ipm;
1182         unsigned long flags;
1183         char buf[MAX_ADDR_LEN];
1184
1185         LCS_DBF_TEXT(4, trace, "remmclst");
1186         spin_lock_irqsave(&card->ipm_lock, flags);
1187         list_for_each(l, &card->ipm_list) {
1188                 ipm = list_entry(l, struct lcs_ipm_list, list);
1189                 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
1190                         lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1191                         if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1192                              (memcmp(buf, &ipm->ipm.mac_addr,
1193                                      LCS_MAC_LENGTH) == 0) )
1194                                 break;
1195                 }
1196                 if (im4 == NULL)
1197                         ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1198         }
1199         spin_unlock_irqrestore(&card->ipm_lock, flags);
1200 }
1201
1202 static inline struct lcs_ipm_list *
1203 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1204 {
1205         struct lcs_ipm_list *tmp, *ipm = NULL;
1206         struct list_head *l;
1207         unsigned long flags;
1208
1209         LCS_DBF_TEXT(4, trace, "chkmcent");
1210         spin_lock_irqsave(&card->ipm_lock, flags);
1211         list_for_each(l, &card->ipm_list) {
1212                 tmp = list_entry(l, struct lcs_ipm_list, list);
1213                 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1214                      (memcmp(buf, &tmp->ipm.mac_addr,
1215                              LCS_MAC_LENGTH) == 0) ) {
1216                         ipm = tmp;
1217                         break;
1218                 }
1219         }
1220         spin_unlock_irqrestore(&card->ipm_lock, flags);
1221         return ipm;
1222 }
1223
1224 static inline void
1225 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1226 {
1227
1228         struct ip_mc_list *im4;
1229         struct lcs_ipm_list *ipm;
1230         char buf[MAX_ADDR_LEN];
1231         unsigned long flags;
1232
1233         LCS_DBF_TEXT(4, trace, "setmclst");
1234         for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
1235                 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1236                 ipm = lcs_check_addr_entry(card, im4, buf);
1237                 if (ipm != NULL)
1238                         continue;       /* Address already in list. */
1239                 ipm = (struct lcs_ipm_list *)
1240                         kmalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1241                 if (ipm == NULL) {
1242                         PRINT_INFO("Not enough memory to add "
1243                                    "new multicast entry!\n");
1244                         break;
1245                 }
1246                 memset(ipm, 0, sizeof(struct lcs_ipm_list));
1247                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1248                 ipm->ipm.ip_addr = im4->multiaddr;
1249                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1250                 spin_lock_irqsave(&card->ipm_lock, flags);
1251                 list_add(&ipm->list, &card->ipm_list);
1252                 spin_unlock_irqrestore(&card->ipm_lock, flags);
1253         }
1254 }
1255
1256 static int
1257 lcs_register_mc_addresses(void *data)
1258 {
1259         struct lcs_card *card;
1260         struct in_device *in4_dev;
1261
1262         card = (struct lcs_card *) data;
1263         daemonize("regipm");
1264
1265         if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1266                 return 0;
1267         LCS_DBF_TEXT(4, trace, "regmulti");
1268
1269         in4_dev = in_dev_get(card->dev);
1270         if (in4_dev == NULL)
1271                 goto out;
1272         read_lock(&in4_dev->mc_list_lock);
1273         lcs_remove_mc_addresses(card,in4_dev);
1274         lcs_set_mc_addresses(card, in4_dev);
1275         read_unlock(&in4_dev->mc_list_lock);
1276         in_dev_put(in4_dev);
1277
1278         lcs_fix_multicast_list(card);
1279 out:
1280         lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1281         return 0;
1282 }
1283 /**
1284  * function called by net device to
1285  * handle multicast address relevant things
1286  */
1287 static void
1288 lcs_set_multicast_list(struct net_device *dev)
1289 {
1290         struct lcs_card *card;
1291
1292         LCS_DBF_TEXT(4, trace, "setmulti");
1293         card = (struct lcs_card *) dev->priv;
1294
1295         if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD)) {
1296                 schedule_work(&card->kernel_thread_starter);
1297         }
1298 }
1299
1300 #endif /* CONFIG_IP_MULTICAST */
1301
1302 static long
1303 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1304 {
1305         if (!IS_ERR(irb))
1306                 return 0;
1307
1308         switch (PTR_ERR(irb)) {
1309         case -EIO:
1310                 PRINT_WARN("i/o-error on device %s\n", cdev->dev.bus_id);
1311                 LCS_DBF_TEXT(2, trace, "ckirberr");
1312                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1313                 break;
1314         case -ETIMEDOUT:
1315                 PRINT_WARN("timeout on device %s\n", cdev->dev.bus_id);
1316                 LCS_DBF_TEXT(2, trace, "ckirberr");
1317                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1318                 break;
1319         default:
1320                 PRINT_WARN("unknown error %ld on device %s\n", PTR_ERR(irb),
1321                            cdev->dev.bus_id);
1322                 LCS_DBF_TEXT(2, trace, "ckirberr");
1323                 LCS_DBF_TEXT(2, trace, "  rc???");
1324         }
1325         return PTR_ERR(irb);
1326 }
1327
1328
1329 /**
1330  * IRQ Handler for LCS channels
1331  */
1332 static void
1333 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1334 {
1335         struct lcs_card *card;
1336         struct lcs_channel *channel;
1337         int index;
1338
1339         if (lcs_check_irb_error(cdev, irb))
1340                 return;
1341
1342         card = CARD_FROM_DEV(cdev);
1343         if (card->read.ccwdev == cdev)
1344                 channel = &card->read;
1345         else
1346                 channel = &card->write;
1347
1348         LCS_DBF_TEXT_(5, trace, "Rint%s",cdev->dev.bus_id);
1349         LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.cstat, irb->scsw.dstat);
1350         LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.fctl, irb->scsw.actl);
1351
1352         /* How far in the ccw chain have we processed? */
1353         if ((channel->state != CH_STATE_INIT) &&
1354             (irb->scsw.fctl & SCSW_FCTL_START_FUNC)) {
1355                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cpa)
1356                         - channel->ccws;
1357                 if ((irb->scsw.actl & SCSW_ACTL_SUSPENDED) ||
1358                     (irb->scsw.cstat | SCHN_STAT_PCI))
1359                         /* Bloody io subsystem tells us lies about cpa... */
1360                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1361                 while (channel->io_idx != index) {
1362                         __lcs_processed_buffer(channel,
1363                                                channel->iob + channel->io_idx);
1364                         channel->io_idx =
1365                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1366                 }
1367         }
1368
1369         if ((irb->scsw.dstat & DEV_STAT_DEV_END) ||
1370             (irb->scsw.dstat & DEV_STAT_CHN_END) ||
1371             (irb->scsw.dstat & DEV_STAT_UNIT_CHECK))
1372                 /* Mark channel as stopped. */
1373                 channel->state = CH_STATE_STOPPED;
1374         else if (irb->scsw.actl & SCSW_ACTL_SUSPENDED)
1375                 /* CCW execution stopped on a suspend bit. */
1376                 channel->state = CH_STATE_SUSPENDED;
1377
1378         if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) {
1379                 if (irb->scsw.cc != 0) {
1380                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1381                         return;
1382                 }
1383                 /* The channel has been stopped by halt_IO. */
1384                 channel->state = CH_STATE_HALTED;
1385         }
1386
1387         if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) {
1388                 channel->state = CH_STATE_CLEARED;
1389         }
1390         /* Do the rest in the tasklet. */
1391         tasklet_schedule(&channel->irq_tasklet);
1392 }
1393
1394 /**
1395  * Tasklet for IRQ handler
1396  */
1397 static void
1398 lcs_tasklet(unsigned long data)
1399 {
1400         unsigned long flags;
1401         struct lcs_channel *channel;
1402         struct lcs_buffer *iob;
1403         int buf_idx;
1404         int rc;
1405
1406         channel = (struct lcs_channel *) data;
1407         LCS_DBF_TEXT_(5, trace, "tlet%s",channel->ccwdev->dev.bus_id);
1408
1409         /* Check for processed buffers. */
1410         iob = channel->iob;
1411         buf_idx = channel->buf_idx;
1412         while (iob[buf_idx].state == BUF_STATE_PROCESSED) {
1413                 /* Do the callback thing. */
1414                 if (iob[buf_idx].callback != NULL)
1415                         iob[buf_idx].callback(channel, iob + buf_idx);
1416                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1417         }
1418         channel->buf_idx = buf_idx;
1419
1420         if (channel->state == CH_STATE_STOPPED)
1421                 // FIXME: what if rc != 0 ??
1422                 rc = lcs_start_channel(channel);
1423         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1424         if (channel->state == CH_STATE_SUSPENDED &&
1425             channel->iob[channel->io_idx].state == BUF_STATE_READY) {
1426                 // FIXME: what if rc != 0 ??
1427                 rc = __lcs_resume_channel(channel);
1428         }
1429         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1430
1431         /* Something happened on the channel. Wake up waiters. */
1432         wake_up(&channel->wait_q);
1433 }
1434
1435 /**
1436  * Finish current tx buffer and make it ready for transmit.
1437  */
1438 static void
1439 __lcs_emit_txbuffer(struct lcs_card *card)
1440 {
1441         LCS_DBF_TEXT(5, trace, "emittx");
1442         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1443         card->tx_buffer->count += 2;
1444         lcs_ready_buffer(&card->write, card->tx_buffer);
1445         card->tx_buffer = NULL;
1446         card->tx_emitted++;
1447 }
1448
1449 /**
1450  * Callback for finished tx buffers.
1451  */
1452 static void
1453 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1454 {
1455         struct lcs_card *card;
1456
1457         LCS_DBF_TEXT(5, trace, "txbuffcb");
1458         /* Put buffer back to pool. */
1459         lcs_release_buffer(channel, buffer);
1460         card = (struct lcs_card *)
1461                 ((char *) channel - offsetof(struct lcs_card, write));
1462         spin_lock(&card->lock);
1463         card->tx_emitted--;
1464         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1465                 /*
1466                  * Last running tx buffer has finished. Submit partially
1467                  * filled current buffer.
1468                  */
1469                 __lcs_emit_txbuffer(card);
1470         spin_unlock(&card->lock);
1471 }
1472
1473 /**
1474  * Packet transmit function called by network stack
1475  */
1476 static int
1477 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1478                  struct net_device *dev)
1479 {
1480         struct lcs_header *header;
1481
1482         LCS_DBF_TEXT(5, trace, "hardxmit");
1483         if (skb == NULL) {
1484                 card->stats.tx_dropped++;
1485                 card->stats.tx_errors++;
1486                 return -EIO;
1487         }
1488         if (card->state != DEV_STATE_UP) {
1489                 dev_kfree_skb(skb);
1490                 card->stats.tx_dropped++;
1491                 card->stats.tx_errors++;
1492                 card->stats.tx_carrier_errors++;
1493                 return 0;
1494         }
1495         if (netif_queue_stopped(dev) ) {
1496                 card->stats.tx_dropped++;
1497                 return -EBUSY;
1498         }
1499         if (card->tx_buffer != NULL &&
1500             card->tx_buffer->count + sizeof(struct lcs_header) +
1501             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1502                 /* skb too big for current tx buffer. */
1503                 __lcs_emit_txbuffer(card);
1504         if (card->tx_buffer == NULL) {
1505                 /* Get new tx buffer */
1506                 card->tx_buffer = lcs_get_buffer(&card->write);
1507                 if (card->tx_buffer == NULL) {
1508                         card->stats.tx_dropped++;
1509                         return -EBUSY;
1510                 }
1511                 card->tx_buffer->callback = lcs_txbuffer_cb;
1512                 card->tx_buffer->count = 0;
1513         }
1514         header = (struct lcs_header *)
1515                 (card->tx_buffer->data + card->tx_buffer->count);
1516         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1517         header->offset = card->tx_buffer->count;
1518         header->type = card->lan_type;
1519         header->slot = card->portno;
1520         memcpy(header + 1, skb->data, skb->len);
1521         card->stats.tx_bytes += skb->len;
1522         card->stats.tx_packets++;
1523         dev_kfree_skb(skb);
1524         if (card->tx_emitted <= 0)
1525                 /* If this is the first tx buffer emit it immediately. */
1526                 __lcs_emit_txbuffer(card);
1527         return 0;
1528 }
1529
1530 static int
1531 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1532 {
1533         struct lcs_card *card;
1534         int rc;
1535
1536         LCS_DBF_TEXT(5, trace, "pktxmit");
1537         card = (struct lcs_card *) dev->priv;
1538         spin_lock(&card->lock);
1539         rc = __lcs_start_xmit(card, skb, dev);
1540         spin_unlock(&card->lock);
1541         return rc;
1542 }
1543
1544 /**
1545  * send startlan and lanstat command to make LCS device ready
1546  */
1547 static int
1548 lcs_startlan_auto(struct lcs_card *card)
1549 {
1550         int rc;
1551
1552         LCS_DBF_TEXT(2, trace, "strtauto");
1553 #ifdef CONFIG_NET_ETHERNET
1554         card->lan_type = LCS_FRAME_TYPE_ENET;
1555         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1556         if (rc == 0)
1557                 return 0;
1558
1559 #endif
1560 #ifdef CONFIG_TR
1561         card->lan_type = LCS_FRAME_TYPE_TR;
1562         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1563         if (rc == 0)
1564                 return 0;
1565 #endif
1566 #ifdef CONFIG_FDDI
1567         card->lan_type = LCS_FRAME_TYPE_FDDI;
1568         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1569         if (rc == 0)
1570                 return 0;
1571 #endif
1572         return -EIO;
1573 }
1574
1575 static int
1576 lcs_startlan(struct lcs_card *card)
1577 {
1578         int rc, i;
1579
1580         LCS_DBF_TEXT(2, trace, "startlan");
1581         rc = 0;
1582         if (card->portno != LCS_INVALID_PORT_NO) {
1583                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1584                         rc = lcs_startlan_auto(card);
1585                 else
1586                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1587         } else {
1588                 for (i = 0; i <= 16; i++) {
1589                         card->portno = i;
1590                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1591                                 rc = lcs_send_startlan(card,
1592                                                        LCS_INITIATOR_TCPIP);
1593                         else
1594                                 /* autodetecting lan type */
1595                                 rc = lcs_startlan_auto(card);
1596                         if (rc == 0)
1597                                 break;
1598                 }
1599         }
1600         if (rc == 0)
1601                 return lcs_send_lanstat(card);
1602         return rc;
1603 }
1604
1605 /**
1606  * LCS detect function
1607  * setup channels and make them I/O ready
1608  */
1609 static int
1610 lcs_detect(struct lcs_card *card)
1611 {
1612         int rc = 0;
1613
1614         LCS_DBF_TEXT(2, setup, "lcsdetct");
1615         /* start/reset card */
1616         if (card->dev)
1617                 netif_stop_queue(card->dev);
1618         rc = lcs_stop_channels(card);
1619         if (rc == 0) {
1620                 rc = lcs_start_channels(card);
1621                 if (rc == 0) {
1622                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1623                         if (rc == 0)
1624                                 rc = lcs_startlan(card);
1625                 }
1626         }
1627         if (rc == 0) {
1628                 card->state = DEV_STATE_UP;
1629         } else {
1630                 card->state = DEV_STATE_DOWN;
1631                 card->write.state = CH_STATE_INIT;
1632                 card->read.state =  CH_STATE_INIT;
1633         }
1634         return rc;
1635 }
1636
1637 /**
1638  * reset card
1639  */
1640 static int
1641 lcs_resetcard(struct lcs_card *card)
1642 {
1643         int retries;
1644
1645         LCS_DBF_TEXT(2, trace, "rescard");
1646         for (retries = 0; retries < 10; retries++) {
1647                 if (lcs_detect(card) == 0) {
1648                         netif_wake_queue(card->dev);
1649                         card->state = DEV_STATE_UP;
1650                         PRINT_INFO("LCS device %s successfully restarted!\n",
1651                                    card->dev->name);
1652                         return 0;
1653                 }
1654                 msleep(3000);
1655         }
1656         PRINT_ERR("Error in Reseting LCS card!\n");
1657         return -EIO;
1658 }
1659
1660
1661 /**
1662  * LCS Stop card
1663  */
1664 static int
1665 lcs_stopcard(struct lcs_card *card)
1666 {
1667         int rc;
1668
1669         LCS_DBF_TEXT(3, setup, "stopcard");
1670
1671         if (card->read.state != CH_STATE_STOPPED &&
1672             card->write.state != CH_STATE_STOPPED &&
1673             card->state == DEV_STATE_UP) {
1674                 lcs_clear_multicast_list(card);
1675                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1676                 rc = lcs_send_shutdown(card);
1677         }
1678         rc = lcs_stop_channels(card);
1679         card->state = DEV_STATE_DOWN;
1680
1681         return rc;
1682 }
1683
1684 /**
1685  * LGW initiated commands
1686  */
1687 static int
1688 lcs_lgw_startlan_thread(void *data)
1689 {
1690         struct lcs_card *card;
1691
1692         card = (struct lcs_card *) data;
1693         daemonize("lgwstpln");
1694
1695         if (!lcs_do_run_thread(card, LCS_STARTLAN_THREAD))
1696                 return 0;
1697         LCS_DBF_TEXT(4, trace, "lgwstpln");
1698         if (card->dev)
1699                 netif_stop_queue(card->dev);
1700         if (lcs_startlan(card) == 0) {
1701                 netif_wake_queue(card->dev);
1702                 card->state = DEV_STATE_UP;
1703                 PRINT_INFO("LCS Startlan for device %s succeeded!\n",
1704                            card->dev->name);
1705
1706         } else
1707                 PRINT_ERR("LCS Startlan for device %s failed!\n",
1708                           card->dev->name);
1709         lcs_clear_thread_running_bit(card, LCS_STARTLAN_THREAD);
1710         return 0;
1711 }
1712
1713 /**
1714  * Send startup command initiated by Lan Gateway
1715  */
1716 static int
1717 lcs_lgw_startup_thread(void *data)
1718 {
1719         int rc;
1720
1721         struct lcs_card *card;
1722
1723         card = (struct lcs_card *) data;
1724         daemonize("lgwstaln");
1725
1726         if (!lcs_do_run_thread(card, LCS_STARTUP_THREAD))
1727                 return 0;
1728         LCS_DBF_TEXT(4, trace, "lgwstaln");
1729         if (card->dev)
1730                 netif_stop_queue(card->dev);
1731         rc = lcs_send_startup(card, LCS_INITIATOR_LGW);
1732         if (rc != 0) {
1733                 PRINT_ERR("Startup for LCS device %s initiated " \
1734                           "by LGW failed!\nReseting card ...\n",
1735                           card->dev->name);
1736                 /* do a card reset */
1737                 rc = lcs_resetcard(card);
1738                 if (rc == 0)
1739                         goto Done;
1740         }
1741         rc = lcs_startlan(card);
1742         if (rc == 0) {
1743                 netif_wake_queue(card->dev);
1744                 card->state = DEV_STATE_UP;
1745         }
1746 Done:
1747         if (rc == 0)
1748                 PRINT_INFO("LCS Startup for device %s succeeded!\n",
1749                            card->dev->name);
1750         else
1751                 PRINT_ERR("LCS Startup for device %s failed!\n",
1752                           card->dev->name);
1753         lcs_clear_thread_running_bit(card, LCS_STARTUP_THREAD);
1754         return 0;
1755 }
1756
1757
1758 /**
1759  * send stoplan command initiated by Lan Gateway
1760  */
1761 static int
1762 lcs_lgw_stoplan_thread(void *data)
1763 {
1764         struct lcs_card *card;
1765         int rc;
1766
1767         card = (struct lcs_card *) data;
1768         daemonize("lgwstop");
1769
1770         if (!lcs_do_run_thread(card, LCS_STOPLAN_THREAD))
1771                 return 0;
1772         LCS_DBF_TEXT(4, trace, "lgwstop");
1773         if (card->dev)
1774                 netif_stop_queue(card->dev);
1775         if (lcs_send_stoplan(card, LCS_INITIATOR_LGW) == 0)
1776                 PRINT_INFO("Stoplan for %s initiated by LGW succeeded!\n",
1777                            card->dev->name);
1778         else
1779                 PRINT_ERR("Stoplan %s initiated by LGW failed!\n",
1780                           card->dev->name);
1781         /*Try to reset the card, stop it on failure */
1782         rc = lcs_resetcard(card);
1783         if (rc != 0)
1784                 rc = lcs_stopcard(card);
1785         lcs_clear_thread_running_bit(card, LCS_STOPLAN_THREAD);
1786         return rc;
1787 }
1788
1789 /**
1790  * Kernel Thread helper functions for LGW initiated commands
1791  */
1792 static void
1793 lcs_start_kernel_thread(struct lcs_card *card)
1794 {
1795         LCS_DBF_TEXT(5, trace, "krnthrd");
1796         if (lcs_do_start_thread(card, LCS_STARTUP_THREAD))
1797                 kernel_thread(lcs_lgw_startup_thread, (void *) card, SIGCHLD);
1798         if (lcs_do_start_thread(card, LCS_STARTLAN_THREAD))
1799                 kernel_thread(lcs_lgw_startlan_thread, (void *) card, SIGCHLD);
1800         if (lcs_do_start_thread(card, LCS_STOPLAN_THREAD))
1801                 kernel_thread(lcs_lgw_stoplan_thread, (void *) card, SIGCHLD);
1802 #ifdef CONFIG_IP_MULTICAST
1803         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1804                 kernel_thread(lcs_register_mc_addresses, (void *) card, SIGCHLD);
1805 #endif
1806 }
1807
1808 /**
1809  * Process control frames.
1810  */
1811 static void
1812 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1813 {
1814         LCS_DBF_TEXT(5, trace, "getctrl");
1815         if (cmd->initiator == LCS_INITIATOR_LGW) {
1816                 switch(cmd->cmd_code) {
1817                 case LCS_CMD_STARTUP:
1818                         if (!lcs_set_thread_start_bit(card,
1819                                                       LCS_STARTUP_THREAD))
1820                                 schedule_work(&card->kernel_thread_starter);
1821                         break;
1822                 case LCS_CMD_STARTLAN:
1823                         if (!lcs_set_thread_start_bit(card,
1824                                                       LCS_STARTLAN_THREAD))
1825                                 schedule_work(&card->kernel_thread_starter);
1826                         break;
1827                 case LCS_CMD_STOPLAN:
1828                         if (!lcs_set_thread_start_bit(card,
1829                                                       LCS_STOPLAN_THREAD))
1830                                 schedule_work(&card->kernel_thread_starter);
1831                         break;
1832                 default:
1833                         PRINT_INFO("UNRECOGNIZED LGW COMMAND\n");
1834                         break;
1835                 }
1836         } else
1837                 lcs_notify_lancmd_waiters(card, cmd);
1838 }
1839
1840 /**
1841  * Unpack network packet.
1842  */
1843 static void
1844 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1845 {
1846         struct sk_buff *skb;
1847
1848         LCS_DBF_TEXT(5, trace, "getskb");
1849         if (card->dev == NULL ||
1850             card->state != DEV_STATE_UP)
1851                 /* The card isn't up. Ignore the packet. */
1852                 return;
1853
1854         skb = dev_alloc_skb(skb_len);
1855         if (skb == NULL) {
1856                 PRINT_ERR("LCS: alloc_skb failed for device=%s\n",
1857                           card->dev->name);
1858                 card->stats.rx_dropped++;
1859                 return;
1860         }
1861         skb->dev = card->dev;
1862         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1863         skb->protocol = card->lan_type_trans(skb, card->dev);
1864         card->stats.rx_bytes += skb_len;
1865         card->stats.rx_packets++;
1866         *((__u32 *)skb->cb) = ++card->pkt_seq;
1867         netif_rx(skb);
1868 }
1869
1870 /**
1871  * LCS main routine to get packets and lancmd replies from the buffers
1872  */
1873 static void
1874 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1875 {
1876         struct lcs_card *card;
1877         struct lcs_header *lcs_hdr;
1878         __u16 offset;
1879
1880         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1881         lcs_hdr = (struct lcs_header *) buffer->data;
1882         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1883                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1884                 return;
1885         }
1886         card = (struct lcs_card *)
1887                 ((char *) channel - offsetof(struct lcs_card, read));
1888         offset = 0;
1889         while (lcs_hdr->offset != 0) {
1890                 if (lcs_hdr->offset <= 0 ||
1891                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1892                     lcs_hdr->offset < offset) {
1893                         /* Offset invalid. */
1894                         card->stats.rx_length_errors++;
1895                         card->stats.rx_errors++;
1896                         return;
1897                 }
1898                 /* What kind of frame is it? */
1899                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1900                         /* Control frame. */
1901                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1902                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1903                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1904                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1905                         /* Normal network packet. */
1906                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1907                                     lcs_hdr->offset - offset -
1908                                     sizeof(struct lcs_header));
1909                 else
1910                         /* Unknown frame type. */
1911                         ; // FIXME: error message ?
1912                 /* Proceed to next frame. */
1913                 offset = lcs_hdr->offset;
1914                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1915                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1916         }
1917         /* The buffer is now empty. Make it ready again. */
1918         lcs_ready_buffer(&card->read, buffer);
1919 }
1920
1921 /**
1922  * get network statistics for ifconfig and other user programs
1923  */
1924 static struct net_device_stats *
1925 lcs_getstats(struct net_device *dev)
1926 {
1927         struct lcs_card *card;
1928
1929         LCS_DBF_TEXT(4, trace, "netstats");
1930         card = (struct lcs_card *) dev->priv;
1931         return &card->stats;
1932 }
1933
1934 /**
1935  * stop lcs device
1936  * This function will be called by user doing ifconfig xxx down
1937  */
1938 static int
1939 lcs_stop_device(struct net_device *dev)
1940 {
1941         struct lcs_card *card;
1942         int rc;
1943
1944         LCS_DBF_TEXT(2, trace, "stopdev");
1945         card   = (struct lcs_card *) dev->priv;
1946         netif_stop_queue(dev);
1947         dev->flags &= ~IFF_UP;
1948         rc = lcs_stopcard(card);
1949         if (rc)
1950                 PRINT_ERR("Try it again!\n ");
1951         return rc;
1952 }
1953
1954 /**
1955  * start lcs device and make it runnable
1956  * This function will be called by user doing ifconfig xxx up
1957  */
1958 static int
1959 lcs_open_device(struct net_device *dev)
1960 {
1961         struct lcs_card *card;
1962         int rc;
1963
1964         LCS_DBF_TEXT(2, trace, "opendev");
1965         card = (struct lcs_card *) dev->priv;
1966         /* initialize statistics */
1967         rc = lcs_detect(card);
1968         if (rc) {
1969                 PRINT_ERR("LCS:Error in opening device!\n");
1970
1971         } else {
1972                 dev->flags |= IFF_UP;
1973                 netif_wake_queue(dev);
1974                 card->state = DEV_STATE_UP;
1975         }
1976         return rc;
1977 }
1978
1979 /**
1980  * show function for portno called by cat or similar things
1981  */
1982 static ssize_t
1983 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1984 {
1985         struct lcs_card *card;
1986
1987         card = (struct lcs_card *)dev->driver_data;
1988
1989         if (!card)
1990                 return 0;
1991
1992         return sprintf(buf, "%d\n", card->portno);
1993 }
1994
1995 /**
1996  * store the value which is piped to file portno
1997  */
1998 static ssize_t
1999 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
2000 {
2001         struct lcs_card *card;
2002         int value;
2003
2004         card = (struct lcs_card *)dev->driver_data;
2005
2006         if (!card)
2007                 return 0;
2008
2009         sscanf(buf, "%u", &value);
2010         /* TODO: sanity checks */
2011         card->portno = value;
2012
2013         return count;
2014
2015 }
2016
2017 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
2018
2019 static ssize_t
2020 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
2021 {
2022         struct ccwgroup_device *cgdev;
2023
2024         cgdev = to_ccwgroupdev(dev);
2025         if (!cgdev)
2026                 return -ENODEV;
2027
2028         return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
2029 }
2030
2031 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
2032
2033 static ssize_t
2034 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
2035 {
2036         struct lcs_card *card;
2037
2038         card = (struct lcs_card *)dev->driver_data;
2039
2040         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
2041 }
2042
2043 static ssize_t
2044 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
2045 {
2046         struct lcs_card *card;
2047         int value;
2048
2049         card = (struct lcs_card *)dev->driver_data;
2050
2051         if (!card)
2052                 return 0;
2053
2054         sscanf(buf, "%u", &value);
2055         /* TODO: sanity checks */
2056         card->lancmd_timeout = value;
2057
2058         return count;
2059
2060 }
2061
2062 DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2063
2064 static struct attribute * lcs_attrs[] = {
2065         &dev_attr_portno.attr,
2066         &dev_attr_type.attr,
2067         &dev_attr_lancmd_timeout.attr,
2068         NULL,
2069 };
2070
2071 static struct attribute_group lcs_attr_group = {
2072         .attrs = lcs_attrs,
2073 };
2074
2075 /**
2076  * lcs_probe_device is called on establishing a new ccwgroup_device.
2077  */
2078 static int
2079 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2080 {
2081         struct lcs_card *card;
2082         int ret;
2083
2084         if (!get_device(&ccwgdev->dev))
2085                 return -ENODEV;
2086
2087         LCS_DBF_TEXT(2, setup, "add_dev");
2088         card = lcs_alloc_card();
2089         if (!card) {
2090                 PRINT_ERR("Allocation of lcs card failed\n");
2091                 put_device(&ccwgdev->dev);
2092                 return -ENOMEM;
2093         }
2094         ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2095         if (ret) {
2096                 PRINT_ERR("Creating attributes failed");
2097                 lcs_free_card(card);
2098                 put_device(&ccwgdev->dev);
2099                 return ret;
2100         }
2101         ccwgdev->dev.driver_data = card;
2102         ccwgdev->cdev[0]->handler = lcs_irq;
2103         ccwgdev->cdev[1]->handler = lcs_irq;
2104         return 0;
2105 }
2106
2107 static int
2108 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2109 {
2110         struct lcs_card *card;
2111
2112         LCS_DBF_TEXT(2, setup, "regnetdv");
2113         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2114         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2115                 return 0;
2116         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2117         return register_netdev(card->dev);
2118 }
2119
2120 /**
2121  * lcs_new_device will be called by setting the group device online.
2122  */
2123
2124 static int
2125 lcs_new_device(struct ccwgroup_device *ccwgdev)
2126 {
2127         struct  lcs_card *card;
2128         struct net_device *dev=NULL;
2129         enum lcs_dev_states recover_state;
2130         int rc;
2131
2132         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2133         if (!card)
2134                 return -ENODEV;
2135
2136         LCS_DBF_TEXT(2, setup, "newdev");
2137         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2138         card->read.ccwdev  = ccwgdev->cdev[0];
2139         card->write.ccwdev = ccwgdev->cdev[1];
2140
2141         recover_state = card->state;
2142         ccw_device_set_online(card->read.ccwdev);
2143         ccw_device_set_online(card->write.ccwdev);
2144
2145         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2146
2147         lcs_setup_card(card);
2148         rc = lcs_detect(card);
2149         if (rc) {
2150                 LCS_DBF_TEXT(2, setup, "dtctfail");
2151                 PRINT_WARN("Detection of LCS card failed with return code "
2152                            "%d (0x%x)\n", rc, rc);
2153                 lcs_stopcard(card);
2154                 goto out;
2155         }
2156         if (card->dev) {
2157                 LCS_DBF_TEXT(2, setup, "samedev");
2158                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2159                 goto netdev_out;
2160         }
2161         switch (card->lan_type) {
2162 #ifdef CONFIG_NET_ETHERNET
2163         case LCS_FRAME_TYPE_ENET:
2164                 card->lan_type_trans = eth_type_trans;
2165                 dev = alloc_etherdev(0);
2166                 break;
2167 #endif
2168 #ifdef CONFIG_TR
2169         case LCS_FRAME_TYPE_TR:
2170                 card->lan_type_trans = tr_type_trans;
2171                 dev = alloc_trdev(0);
2172                 break;
2173 #endif
2174 #ifdef CONFIG_FDDI
2175         case LCS_FRAME_TYPE_FDDI:
2176                 card->lan_type_trans = fddi_type_trans;
2177                 dev = alloc_fddidev(0);
2178                 break;
2179 #endif
2180         default:
2181                 LCS_DBF_TEXT(3, setup, "errinit");
2182                 PRINT_ERR("LCS: Initialization failed\n");
2183                 PRINT_ERR("LCS: No device found!\n");
2184                 goto out;
2185         }
2186         if (!dev)
2187                 goto out;
2188         card->dev = dev;
2189         card->dev->priv = card;
2190         card->dev->open = lcs_open_device;
2191         card->dev->stop = lcs_stop_device;
2192         card->dev->hard_start_xmit = lcs_start_xmit;
2193         card->dev->get_stats = lcs_getstats;
2194         SET_MODULE_OWNER(dev);
2195         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2196 #ifdef CONFIG_IP_MULTICAST
2197         if (!lcs_check_multicast_support(card))
2198                 card->dev->set_multicast_list = lcs_set_multicast_list;
2199 #endif
2200 netdev_out:
2201         lcs_set_allowed_threads(card,0xffffffff);
2202         if (recover_state == DEV_STATE_RECOVER) {
2203                 lcs_set_multicast_list(card->dev);
2204                 card->dev->flags |= IFF_UP;
2205                 netif_wake_queue(card->dev);
2206                 card->state = DEV_STATE_UP;
2207         } else {
2208                 lcs_stopcard(card);
2209         }
2210
2211         if (lcs_register_netdev(ccwgdev) != 0)
2212                 goto out;
2213
2214         /* Print out supported assists: IPv6 */
2215         PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
2216                    (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2217                    "with" : "without");
2218         /* Print out supported assist: Multicast */
2219         PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
2220                    (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2221                    "with" : "without");
2222         return 0;
2223 out:
2224
2225         ccw_device_set_offline(card->read.ccwdev);
2226         ccw_device_set_offline(card->write.ccwdev);
2227         return -ENODEV;
2228 }
2229
2230 /**
2231  * lcs_shutdown_device, called when setting the group device offline.
2232  */
2233 static int
2234 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2235 {
2236         struct lcs_card *card;
2237         enum lcs_dev_states recover_state;
2238         int ret;
2239
2240         LCS_DBF_TEXT(3, setup, "shtdndev");
2241         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2242         if (!card)
2243                 return -ENODEV;
2244         lcs_set_allowed_threads(card, 0);
2245         if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2246                 return -ERESTARTSYS;
2247         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2248         recover_state = card->state;
2249
2250         ret = lcs_stop_device(card->dev);
2251         ret = ccw_device_set_offline(card->read.ccwdev);
2252         ret = ccw_device_set_offline(card->write.ccwdev);
2253         if (recover_state == DEV_STATE_UP) {
2254                 card->state = DEV_STATE_RECOVER;
2255         }
2256         if (ret)
2257                 return ret;
2258         return 0;
2259 }
2260
2261 /**
2262  * lcs_remove_device, free buffers and card
2263  */
2264 static void
2265 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2266 {
2267         struct lcs_card *card;
2268
2269         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2270         if (!card)
2271                 return;
2272
2273         PRINT_INFO("Removing lcs group device ....\n");
2274         LCS_DBF_TEXT(3, setup, "remdev");
2275         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2276         if (ccwgdev->state == CCWGROUP_ONLINE) {
2277                 lcs_shutdown_device(ccwgdev);
2278         }
2279         if (card->dev)
2280                 unregister_netdev(card->dev);
2281         sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2282         lcs_cleanup_card(card);
2283         lcs_free_card(card);
2284         put_device(&ccwgdev->dev);
2285 }
2286
2287 /**
2288  * LCS ccwgroup driver registration
2289  */
2290 static struct ccwgroup_driver lcs_group_driver = {
2291         .owner       = THIS_MODULE,
2292         .name        = "lcs",
2293         .max_slaves  = 2,
2294         .driver_id   = 0xD3C3E2,
2295         .probe       = lcs_probe_device,
2296         .remove      = lcs_remove_device,
2297         .set_online  = lcs_new_device,
2298         .set_offline = lcs_shutdown_device,
2299 };
2300
2301 /**
2302  *  LCS Module/Kernel initialization function
2303  */
2304 static int
2305 __init lcs_init_module(void)
2306 {
2307         int rc;
2308
2309         PRINT_INFO("Loading %s\n",version);
2310         rc = lcs_register_debug_facility();
2311         LCS_DBF_TEXT(0, setup, "lcsinit");
2312         if (rc) {
2313                 PRINT_ERR("Initialization failed\n");
2314                 return rc;
2315         }
2316
2317         rc = register_cu3088_discipline(&lcs_group_driver);
2318         if (rc) {
2319                 PRINT_ERR("Initialization failed\n");
2320                 return rc;
2321         }
2322
2323         return 0;
2324 }
2325
2326
2327 /**
2328  *  LCS module cleanup function
2329  */
2330 static void
2331 __exit lcs_cleanup_module(void)
2332 {
2333         PRINT_INFO("Terminating lcs module.\n");
2334         LCS_DBF_TEXT(0, trace, "cleanup");
2335         unregister_cu3088_discipline(&lcs_group_driver);
2336         lcs_unregister_debug_facility();
2337 }
2338
2339 module_init(lcs_init_module);
2340 module_exit(lcs_cleanup_module);
2341
2342 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2343 MODULE_LICENSE("GPL");
2344