drivers/s390/net/lcs.c

   1 /*
   2  *  linux/drivers/s390/net/lcs.c
   3  *
   4  *  Linux for S/390 Lan Channel Station Network Driver
   5  *
   6  *  Copyright (C)  1999-2001 IBM Deutschland Entwicklung GmbH,
   7  *                           IBM Corporation
   8  *    Author(s): Original Code written by
   9  *                        DJ Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
  10  *               Rewritten by
  11  *                        Frank Pavlic (fpavlic@de.ibm.com) and
  12  *                        Martin Schwidefsky <schwidefsky@de.ibm.com>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2, or (at your option)
  17  * any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27  */
  28
  29 #define KMSG_COMPONENT          "lcs"
  30 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  31
  32 #include <linux/module.h>
  33 #include <linux/if.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/etherdevice.h>
  36 #include <linux/trdevice.h>
  37 #include <linux/fddidevice.h>
  38 #include <linux/inetdevice.h>
  39 #include <linux/in.h>
  40 #include <linux/igmp.h>
  41 #include <linux/delay.h>
  42 #include <linux/kthread.h>
  43 #include <net/arp.h>
  44 #include <net/ip.h>
  45
  46 #include <asm/debug.h>
  47 #include <asm/idals.h>
  48 #include <asm/timex.h>
  49 #include <linux/device.h>
  50 #include <asm/ccwgroup.h>
  51
  52 #include "lcs.h"
  53 #include "cu3088.h"
  54
  55
  56 #if !defined(CONFIG_NET_ETHERNET) && \
  57     !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
  58 #error Cannot compile lcs.c without some net devices switched on.
  59 #endif
  60
  61 /**
  62  * initialization string for output
  63  */
  64
  65 static char version[] __initdata = "LCS driver";
  66 static char debug_buffer[255];
  67
  68 /**
  69  * Some prototypes.
  70  */
  71 static void lcs_tasklet(unsigned long);
  72 static void lcs_start_kernel_thread(struct work_struct *);
  73 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
  74 #ifdef CONFIG_IP_MULTICAST
  75 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
  76 #endif /* CONFIG_IP_MULTICAST */
  77 static int lcs_recovery(void *ptr);
  78
  79 /**
  80  * Debug Facility Stuff
  81  */
  82 static debug_info_t *lcs_dbf_setup;
  83 static debug_info_t *lcs_dbf_trace;
  84
  85 /**
  86  *  LCS Debug Facility functions
  87  */
  88 static void
  89 lcs_unregister_debug_facility(void)
  90 {
  91         if (lcs_dbf_setup)
  92                 debug_unregister(lcs_dbf_setup);
  93         if (lcs_dbf_trace)
  94                 debug_unregister(lcs_dbf_trace);
  95 }
  96
  97 static int
  98 lcs_register_debug_facility(void)
  99 {
 100         lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
 101         lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
 102         if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
 103                 pr_err("Not enough memory for debug facility.\n");
 104                 lcs_unregister_debug_facility();
 105                 return -ENOMEM;
 106         }
 107         debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
 108         debug_set_level(lcs_dbf_setup, 2);
 109         debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
 110         debug_set_level(lcs_dbf_trace, 2);
 111         return 0;
 112 }
 113
 114 /**
 115  * Allocate io buffers.
 116  */
 117 static int
 118 lcs_alloc_channel(struct lcs_channel *channel)
 119 {
 120         int cnt;
 121
 122         LCS_DBF_TEXT(2, setup, "ichalloc");
 123         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 124                 /* alloc memory fo iobuffer */
 125                 channel->iob[cnt].data =
 126                         kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
 127                 if (channel->iob[cnt].data == NULL)
 128                         break;
 129                 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
 130         }
 131         if (cnt < LCS_NUM_BUFFS) {
 132                 /* Not all io buffers could be allocated. */
 133                 LCS_DBF_TEXT(2, setup, "echalloc");
 134                 while (cnt-- > 0)
 135                         kfree(channel->iob[cnt].data);
 136                 return -ENOMEM;
 137         }
 138         return 0;
 139 }
 140
 141 /**
 142  * Free io buffers.
 143  */
 144 static void
 145 lcs_free_channel(struct lcs_channel *channel)
 146 {
 147         int cnt;
 148
 149         LCS_DBF_TEXT(2, setup, "ichfree");
 150         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 151                 kfree(channel->iob[cnt].data);
 152                 channel->iob[cnt].data = NULL;
 153         }
 154 }
 155
 156 /*
 157  * Cleanup channel.
 158  */
 159 static void
 160 lcs_cleanup_channel(struct lcs_channel *channel)
 161 {
 162         LCS_DBF_TEXT(3, setup, "cleanch");
 163         /* Kill write channel tasklets. */
 164         tasklet_kill(&channel->irq_tasklet);
 165         /* Free channel buffers. */
 166         lcs_free_channel(channel);
 167 }
 168
 169 /**
 170  * LCS free memory for card and channels.
 171  */
 172 static void
 173 lcs_free_card(struct lcs_card *card)
 174 {
 175         LCS_DBF_TEXT(2, setup, "remcard");
 176         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 177         kfree(card);
 178 }
 179
 180 /**
 181  * LCS alloc memory for card and channels
 182  */
 183 static struct lcs_card *
 184 lcs_alloc_card(void)
 185 {
 186         struct lcs_card *card;
 187         int rc;
 188
 189         LCS_DBF_TEXT(2, setup, "alloclcs");
 190
 191         card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
 192         if (card == NULL)
 193                 return NULL;
 194         card->lan_type = LCS_FRAME_TYPE_AUTO;
 195         card->pkt_seq = 0;
 196         card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
 197         /* Allocate io buffers for the read channel. */
 198         rc = lcs_alloc_channel(&card->read);
 199         if (rc){
 200                 LCS_DBF_TEXT(2, setup, "iccwerr");
 201                 lcs_free_card(card);
 202                 return NULL;
 203         }
 204         /* Allocate io buffers for the write channel. */
 205         rc = lcs_alloc_channel(&card->write);
 206         if (rc) {
 207                 LCS_DBF_TEXT(2, setup, "iccwerr");
 208                 lcs_cleanup_channel(&card->read);
 209                 lcs_free_card(card);
 210                 return NULL;
 211         }
 212
 213 #ifdef CONFIG_IP_MULTICAST
 214         INIT_LIST_HEAD(&card->ipm_list);
 215 #endif
 216         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 217         return card;
 218 }
 219
 220 /*
 221  * Setup read channel.
 222  */
 223 static void
 224 lcs_setup_read_ccws(struct lcs_card *card)
 225 {
 226         int cnt;
 227
 228         LCS_DBF_TEXT(2, setup, "ireadccw");
 229         /* Setup read ccws. */
 230         memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
 231         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 232                 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
 233                 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
 234                 card->read.ccws[cnt].flags =
 235                         CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
 236                 /*
 237                  * Note: we have allocated the buffer with GFP_DMA, so
 238                  * we do not need to do set_normalized_cda.
 239                  */
 240                 card->read.ccws[cnt].cda =
 241                         (__u32) __pa(card->read.iob[cnt].data);
 242                 ((struct lcs_header *)
 243                  card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
 244                 card->read.iob[cnt].callback = lcs_get_frames_cb;
 245                 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
 246                 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
 247         }
 248         card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
 249         card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
 250         card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
 251         /* Last ccw is a tic (transfer in channel). */
 252         card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 253         card->read.ccws[LCS_NUM_BUFFS].cda =
 254                 (__u32) __pa(card->read.ccws);
 255         /* Setg initial state of the read channel. */
 256         card->read.state = LCS_CH_STATE_INIT;
 257
 258         card->read.io_idx = 0;
 259         card->read.buf_idx = 0;
 260 }
 261
 262 static void
 263 lcs_setup_read(struct lcs_card *card)
 264 {
 265         LCS_DBF_TEXT(3, setup, "initread");
 266
 267         lcs_setup_read_ccws(card);
 268         /* Initialize read channel tasklet. */
 269         card->read.irq_tasklet.data = (unsigned long) &card->read;
 270         card->read.irq_tasklet.func = lcs_tasklet;
 271         /* Initialize waitqueue. */
 272         init_waitqueue_head(&card->read.wait_q);
 273 }
 274
 275 /*
 276  * Setup write channel.
 277  */
 278 static void
 279 lcs_setup_write_ccws(struct lcs_card *card)
 280 {
 281         int cnt;
 282
 283         LCS_DBF_TEXT(3, setup, "iwritccw");
 284         /* Setup write ccws. */
 285         memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
 286         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 287                 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
 288                 card->write.ccws[cnt].count = 0;
 289                 card->write.ccws[cnt].flags =
 290                         CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
 291                 /*
 292                  * Note: we have allocated the buffer with GFP_DMA, so
 293                  * we do not need to do set_normalized_cda.
 294                  */
 295                 card->write.ccws[cnt].cda =
 296                         (__u32) __pa(card->write.iob[cnt].data);
 297         }
 298         /* Last ccw is a tic (transfer in channel). */
 299         card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 300         card->write.ccws[LCS_NUM_BUFFS].cda =
 301                 (__u32) __pa(card->write.ccws);
 302         /* Set initial state of the write channel. */
 303         card->read.state = LCS_CH_STATE_INIT;
 304
 305         card->write.io_idx = 0;
 306         card->write.buf_idx = 0;
 307 }
 308
 309 static void
 310 lcs_setup_write(struct lcs_card *card)
 311 {
 312         LCS_DBF_TEXT(3, setup, "initwrit");
 313
 314         lcs_setup_write_ccws(card);
 315         /* Initialize write channel tasklet. */
 316         card->write.irq_tasklet.data = (unsigned long) &card->write;
 317         card->write.irq_tasklet.func = lcs_tasklet;
 318         /* Initialize waitqueue. */
 319         init_waitqueue_head(&card->write.wait_q);
 320 }
 321
 322 static void
 323 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
 324 {
 325         unsigned long flags;
 326
 327         spin_lock_irqsave(&card->mask_lock, flags);
 328         card->thread_allowed_mask = threads;
 329         spin_unlock_irqrestore(&card->mask_lock, flags);
 330         wake_up(&card->wait_q);
 331 }
 332 static inline int
 333 lcs_threads_running(struct lcs_card *card, unsigned long threads)
 334 {
 335         unsigned long flags;
 336         int rc = 0;
 337
 338         spin_lock_irqsave(&card->mask_lock, flags);
 339         rc = (card->thread_running_mask & threads);
 340         spin_unlock_irqrestore(&card->mask_lock, flags);
 341         return rc;
 342 }
 343
 344 static int
 345 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
 346 {
 347         return wait_event_interruptible(card->wait_q,
 348                         lcs_threads_running(card, threads) == 0);
 349 }
 350
 351 static inline int
 352 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
 353 {
 354         unsigned long flags;
 355
 356         spin_lock_irqsave(&card->mask_lock, flags);
 357         if ( !(card->thread_allowed_mask & thread) ||
 358               (card->thread_start_mask & thread) ) {
 359                 spin_unlock_irqrestore(&card->mask_lock, flags);
 360                 return -EPERM;
 361         }
 362         card->thread_start_mask |= thread;
 363         spin_unlock_irqrestore(&card->mask_lock, flags);
 364         return 0;
 365 }
 366
 367 static void
 368 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
 369 {
 370         unsigned long flags;
 371
 372         spin_lock_irqsave(&card->mask_lock, flags);
 373         card->thread_running_mask &= ~thread;
 374         spin_unlock_irqrestore(&card->mask_lock, flags);
 375         wake_up(&card->wait_q);
 376 }
 377
 378 static inline int
 379 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 380 {
 381         unsigned long flags;
 382         int rc = 0;
 383
 384         spin_lock_irqsave(&card->mask_lock, flags);
 385         if (card->thread_start_mask & thread){
 386                 if ((card->thread_allowed_mask & thread) &&
 387                     !(card->thread_running_mask & thread)){
 388                         rc = 1;
 389                         card->thread_start_mask &= ~thread;
 390                         card->thread_running_mask |= thread;
 391                 } else
 392                         rc = -EPERM;
 393         }
 394         spin_unlock_irqrestore(&card->mask_lock, flags);
 395         return rc;
 396 }
 397
 398 static int
 399 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 400 {
 401         int rc = 0;
 402         wait_event(card->wait_q,
 403                    (rc = __lcs_do_run_thread(card, thread)) >= 0);
 404         return rc;
 405 }
 406
 407 static int
 408 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
 409 {
 410         unsigned long flags;
 411         int rc = 0;
 412
 413         spin_lock_irqsave(&card->mask_lock, flags);
 414         LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
 415                         (u8) card->thread_start_mask,
 416                         (u8) card->thread_allowed_mask,
 417                         (u8) card->thread_running_mask);
 418         rc = (card->thread_start_mask & thread);
 419         spin_unlock_irqrestore(&card->mask_lock, flags);
 420         return rc;
 421 }
 422
 423 /**
 424  * Initialize channels,card and state machines.
 425  */
 426 static void
 427 lcs_setup_card(struct lcs_card *card)
 428 {
 429         LCS_DBF_TEXT(2, setup, "initcard");
 430         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 431
 432         lcs_setup_read(card);
 433         lcs_setup_write(card);
 434         /* Set cards initial state. */
 435         card->state = DEV_STATE_DOWN;
 436         card->tx_buffer = NULL;
 437         card->tx_emitted = 0;
 438
 439         init_waitqueue_head(&card->wait_q);
 440         spin_lock_init(&card->lock);
 441         spin_lock_init(&card->ipm_lock);
 442         spin_lock_init(&card->mask_lock);
 443 #ifdef CONFIG_IP_MULTICAST
 444         INIT_LIST_HEAD(&card->ipm_list);
 445 #endif
 446         INIT_LIST_HEAD(&card->lancmd_waiters);
 447 }
 448
 449 static inline void
 450 lcs_clear_multicast_list(struct lcs_card *card)
 451 {
 452 #ifdef  CONFIG_IP_MULTICAST
 453         struct lcs_ipm_list *ipm;
 454         unsigned long flags;
 455
 456         /* Free multicast list. */
 457         LCS_DBF_TEXT(3, setup, "clmclist");
 458         spin_lock_irqsave(&card->ipm_lock, flags);
 459         while (!list_empty(&card->ipm_list)){
 460                 ipm = list_entry(card->ipm_list.next,
 461                                  struct lcs_ipm_list, list);
 462                 list_del(&ipm->list);
 463                 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
 464                         spin_unlock_irqrestore(&card->ipm_lock, flags);
 465                         lcs_send_delipm(card, ipm);
 466                         spin_lock_irqsave(&card->ipm_lock, flags);
 467                 }
 468                 kfree(ipm);
 469         }
 470         spin_unlock_irqrestore(&card->ipm_lock, flags);
 471 #endif
 472 }
 473 /**
 474  * Cleanup channels,card and state machines.
 475  */
 476 static void
 477 lcs_cleanup_card(struct lcs_card *card)
 478 {
 479
 480         LCS_DBF_TEXT(3, setup, "cleancrd");
 481         LCS_DBF_HEX(2,setup,&card,sizeof(void*));
 482
 483         if (card->dev != NULL)
 484                 free_netdev(card->dev);
 485         /* Cleanup channels. */
 486         lcs_cleanup_channel(&card->write);
 487         lcs_cleanup_channel(&card->read);
 488 }
 489
 490 /**
 491  * Start channel.
 492  */
 493 static int
 494 lcs_start_channel(struct lcs_channel *channel)
 495 {
 496         unsigned long flags;
 497         int rc;
 498
 499         LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
 500         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 501         rc = ccw_device_start(channel->ccwdev,
 502                               channel->ccws + channel->io_idx, 0, 0,
 503                               DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
 504         if (rc == 0)
 505                 channel->state = LCS_CH_STATE_RUNNING;
 506         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 507         if (rc) {
 508                 LCS_DBF_TEXT_(4,trace,"essh%s",
 509                               dev_name(&channel->ccwdev->dev));
 510                 dev_err(&channel->ccwdev->dev,
 511                         "Starting an LCS device resulted in an error,"
 512                         " rc=%d!\n", rc);
 513         }
 514         return rc;
 515 }
 516
 517 static int
 518 lcs_clear_channel(struct lcs_channel *channel)
 519 {
 520         unsigned long flags;
 521         int rc;
 522
 523         LCS_DBF_TEXT(4,trace,"clearch");
 524         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
 525         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 526         rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
 527         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 528         if (rc) {
 529                 LCS_DBF_TEXT_(4, trace, "ecsc%s",
 530                               dev_name(&channel->ccwdev->dev));
 531                 return rc;
 532         }
 533         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
 534         channel->state = LCS_CH_STATE_STOPPED;
 535         return rc;
 536 }
 537
 538
 539 /**
 540  * Stop channel.
 541  */
 542 static int
 543 lcs_stop_channel(struct lcs_channel *channel)
 544 {
 545         unsigned long flags;
 546         int rc;
 547
 548         if (channel->state == LCS_CH_STATE_STOPPED)
 549                 return 0;
 550         LCS_DBF_TEXT(4,trace,"haltsch");
 551         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
 552         channel->state = LCS_CH_STATE_INIT;
 553         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 554         rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
 555         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 556         if (rc) {
 557                 LCS_DBF_TEXT_(4, trace, "ehsc%s",
 558                               dev_name(&channel->ccwdev->dev));
 559                 return rc;
 560         }
 561         /* Asynchronous halt initialted. Wait for its completion. */
 562         wait_event(channel->wait_q, (channel->state == LCS_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 == LCS_BUF_STATE_EMPTY) {
 611                         channel->iob[index].state = LCS_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 != LCS_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", dev_name(&channel->ccwdev->dev));
 645         rc = ccw_device_resume(channel->ccwdev);
 646         if (rc) {
 647                 LCS_DBF_TEXT_(4, trace, "ersc%s",
 648                               dev_name(&channel->ccwdev->dev));
 649                 dev_err(&channel->ccwdev->dev,
 650                         "Sending data from the LCS device to the LAN failed"
 651                         " with rc=%d\n",rc);
 652         } else
 653                 channel->state = LCS_CH_STATE_RUNNING;
 654         return rc;
 655
 656 }
 657
 658 /**
 659  * Make a buffer ready for processing.
 660  */
 661 static inline void
 662 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
 663 {
 664         int prev, next;
 665
 666         LCS_DBF_TEXT(5, trace, "rdybits");
 667         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 668         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 669         /* Check if we may clear the suspend bit of this buffer. */
 670         if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
 671                 /* Check if we have to set the PCI bit. */
 672                 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
 673                         /* Suspend bit of the previous buffer is not set. */
 674                         channel->ccws[index].flags |= CCW_FLAG_PCI;
 675                 /* Suspend bit of the next buffer is set. */
 676                 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
 677         }
 678 }
 679
 680 static int
 681 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 682 {
 683         unsigned long flags;
 684         int index, rc;
 685
 686         LCS_DBF_TEXT(5, trace, "rdybuff");
 687         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 688                buffer->state != LCS_BUF_STATE_PROCESSED);
 689         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 690         buffer->state = LCS_BUF_STATE_READY;
 691         index = buffer - channel->iob;
 692         /* Set length. */
 693         channel->ccws[index].count = buffer->count;
 694         /* Check relevant PCI/suspend bits. */
 695         __lcs_ready_buffer_bits(channel, index);
 696         rc = __lcs_resume_channel(channel);
 697         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 698         return rc;
 699 }
 700
 701 /**
 702  * Mark the buffer as processed. Take care of the suspend bit
 703  * of the previous buffer. This function is called from
 704  * interrupt context, so the lock must not be taken.
 705  */
 706 static int
 707 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 708 {
 709         int index, prev, next;
 710
 711         LCS_DBF_TEXT(5, trace, "prcsbuff");
 712         BUG_ON(buffer->state != LCS_BUF_STATE_READY);
 713         buffer->state = LCS_BUF_STATE_PROCESSED;
 714         index = buffer - channel->iob;
 715         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 716         next = (index + 1) & (LCS_NUM_BUFFS - 1);
 717         /* Set the suspend bit and clear the PCI bit of this buffer. */
 718         channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
 719         channel->ccws[index].flags &= ~CCW_FLAG_PCI;
 720         /* Check the suspend bit of the previous buffer. */
 721         if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
 722                 /*
 723                  * Previous buffer is in state ready. It might have
 724                  * happened in lcs_ready_buffer that the suspend bit
 725                  * has not been cleared to avoid an endless loop.
 726                  * Do it now.
 727                  */
 728                 __lcs_ready_buffer_bits(channel, prev);
 729         }
 730         /* Clear PCI bit of next buffer. */
 731         channel->ccws[next].flags &= ~CCW_FLAG_PCI;
 732         return __lcs_resume_channel(channel);
 733 }
 734
 735 /**
 736  * Put a processed buffer back to state empty.
 737  */
 738 static void
 739 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 740 {
 741         unsigned long flags;
 742
 743         LCS_DBF_TEXT(5, trace, "relbuff");
 744         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 745                buffer->state != LCS_BUF_STATE_PROCESSED);
 746         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 747         buffer->state = LCS_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 = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
 801         if (!reply)
 802                 return NULL;
 803         atomic_set(&reply->refcnt,1);
 804         reply->sequence_no = cmd->sequence_no;
 805         reply->received = 0;
 806         reply->rc = 0;
 807         init_waitqueue_head(&reply->wait_q);
 808
 809         return reply;
 810 }
 811
 812 /**
 813  * Notifier function for lancmd replies. Called from read irq.
 814  */
 815 static void
 816 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
 817 {
 818         struct list_head *l, *n;
 819         struct lcs_reply *reply;
 820
 821         LCS_DBF_TEXT(4, trace, "notiwait");
 822         spin_lock(&card->lock);
 823         list_for_each_safe(l, n, &card->lancmd_waiters) {
 824                 reply = list_entry(l, struct lcs_reply, list);
 825                 if (reply->sequence_no == cmd->sequence_no) {
 826                         lcs_get_reply(reply);
 827                         list_del_init(&reply->list);
 828                         if (reply->callback != NULL)
 829                                 reply->callback(card, cmd);
 830                         reply->received = 1;
 831                         reply->rc = cmd->return_code;
 832                         wake_up(&reply->wait_q);
 833                         lcs_put_reply(reply);
 834                         break;
 835                 }
 836         }
 837         spin_unlock(&card->lock);
 838 }
 839
 840 /**
 841  * Emit buffer of a lan comand.
 842  */
 843 static void
 844 lcs_lancmd_timeout(unsigned long data)
 845 {
 846         struct lcs_reply *reply, *list_reply, *r;
 847         unsigned long flags;
 848
 849         LCS_DBF_TEXT(4, trace, "timeout");
 850         reply = (struct lcs_reply *) data;
 851         spin_lock_irqsave(&reply->card->lock, flags);
 852         list_for_each_entry_safe(list_reply, r,
 853                                  &reply->card->lancmd_waiters,list) {
 854                 if (reply == list_reply) {
 855                         lcs_get_reply(reply);
 856                         list_del_init(&reply->list);
 857                         spin_unlock_irqrestore(&reply->card->lock, flags);
 858                         reply->received = 1;
 859                         reply->rc = -ETIME;
 860                         wake_up(&reply->wait_q);
 861                         lcs_put_reply(reply);
 862                         return;
 863                 }
 864         }
 865         spin_unlock_irqrestore(&reply->card->lock, flags);
 866 }
 867
 868 static int
 869 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
 870                 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
 871 {
 872         struct lcs_reply *reply;
 873         struct lcs_cmd *cmd;
 874         struct timer_list timer;
 875         unsigned long flags;
 876         int rc;
 877
 878         LCS_DBF_TEXT(4, trace, "sendcmd");
 879         cmd = (struct lcs_cmd *) buffer->data;
 880         cmd->return_code = 0;
 881         cmd->sequence_no = card->sequence_no++;
 882         reply = lcs_alloc_reply(cmd);
 883         if (!reply)
 884                 return -ENOMEM;
 885         reply->callback = reply_callback;
 886         reply->card = card;
 887         spin_lock_irqsave(&card->lock, flags);
 888         list_add_tail(&reply->list, &card->lancmd_waiters);
 889         spin_unlock_irqrestore(&card->lock, flags);
 890
 891         buffer->callback = lcs_release_buffer;
 892         rc = lcs_ready_buffer(&card->write, buffer);
 893         if (rc)
 894                 return rc;
 895         init_timer(&timer);
 896         timer.function = lcs_lancmd_timeout;
 897         timer.data = (unsigned long) reply;
 898         timer.expires = jiffies + HZ*card->lancmd_timeout;
 899         add_timer(&timer);
 900         wait_event(reply->wait_q, reply->received);
 901         del_timer_sync(&timer);
 902         LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
 903         rc = reply->rc;
 904         lcs_put_reply(reply);
 905         return rc ? -EIO : 0;
 906 }
 907
 908 /**
 909  * LCS startup command
 910  */
 911 static int
 912 lcs_send_startup(struct lcs_card *card, __u8 initiator)
 913 {
 914         struct lcs_buffer *buffer;
 915         struct lcs_cmd *cmd;
 916
 917         LCS_DBF_TEXT(2, trace, "startup");
 918         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 919         cmd = (struct lcs_cmd *) buffer->data;
 920         cmd->cmd_code = LCS_CMD_STARTUP;
 921         cmd->initiator = initiator;
 922         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
 923         return lcs_send_lancmd(card, buffer, NULL);
 924 }
 925
 926 /**
 927  * LCS shutdown command
 928  */
 929 static int
 930 lcs_send_shutdown(struct lcs_card *card)
 931 {
 932         struct lcs_buffer *buffer;
 933         struct lcs_cmd *cmd;
 934
 935         LCS_DBF_TEXT(2, trace, "shutdown");
 936         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 937         cmd = (struct lcs_cmd *) buffer->data;
 938         cmd->cmd_code = LCS_CMD_SHUTDOWN;
 939         cmd->initiator = LCS_INITIATOR_TCPIP;
 940         return lcs_send_lancmd(card, buffer, NULL);
 941 }
 942
 943 /**
 944  * LCS lanstat command
 945  */
 946 static void
 947 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 948 {
 949         LCS_DBF_TEXT(2, trace, "statcb");
 950         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
 951 }
 952
 953 static int
 954 lcs_send_lanstat(struct lcs_card *card)
 955 {
 956         struct lcs_buffer *buffer;
 957         struct lcs_cmd *cmd;
 958
 959         LCS_DBF_TEXT(2,trace, "cmdstat");
 960         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 961         cmd = (struct lcs_cmd *) buffer->data;
 962         /* Setup lanstat command. */
 963         cmd->cmd_code = LCS_CMD_LANSTAT;
 964         cmd->initiator = LCS_INITIATOR_TCPIP;
 965         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 966         cmd->cmd.lcs_std_cmd.portno = card->portno;
 967         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
 968 }
 969
 970 /**
 971  * send stoplan command
 972  */
 973 static int
 974 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
 975 {
 976         struct lcs_buffer *buffer;
 977         struct lcs_cmd *cmd;
 978
 979         LCS_DBF_TEXT(2, trace, "cmdstpln");
 980         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 981         cmd = (struct lcs_cmd *) buffer->data;
 982         cmd->cmd_code = LCS_CMD_STOPLAN;
 983         cmd->initiator = initiator;
 984         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 985         cmd->cmd.lcs_std_cmd.portno = card->portno;
 986         return lcs_send_lancmd(card, buffer, NULL);
 987 }
 988
 989 /**
 990  * send startlan command
 991  */
 992 static void
 993 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 994 {
 995         LCS_DBF_TEXT(2, trace, "srtlancb");
 996         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
 997         card->portno = cmd->cmd.lcs_std_cmd.portno;
 998 }
 999
1000 static int
1001 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1002 {
1003         struct lcs_buffer *buffer;
1004         struct lcs_cmd *cmd;
1005
1006         LCS_DBF_TEXT(2, trace, "cmdstaln");
1007         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1008         cmd = (struct lcs_cmd *) buffer->data;
1009         cmd->cmd_code = LCS_CMD_STARTLAN;
1010         cmd->initiator = initiator;
1011         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1012         cmd->cmd.lcs_std_cmd.portno = card->portno;
1013         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1014 }
1015
1016 #ifdef CONFIG_IP_MULTICAST
1017 /**
1018  * send setipm command (Multicast)
1019  */
1020 static int
1021 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1022 {
1023         struct lcs_buffer *buffer;
1024         struct lcs_cmd *cmd;
1025
1026         LCS_DBF_TEXT(2, trace, "cmdsetim");
1027         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1028         cmd = (struct lcs_cmd *) buffer->data;
1029         cmd->cmd_code = LCS_CMD_SETIPM;
1030         cmd->initiator = LCS_INITIATOR_TCPIP;
1031         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1032         cmd->cmd.lcs_qipassist.portno = card->portno;
1033         cmd->cmd.lcs_qipassist.version = 4;
1034         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1035         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1036                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1037         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1038         return lcs_send_lancmd(card, buffer, NULL);
1039 }
1040
1041 /**
1042  * send delipm command (Multicast)
1043  */
1044 static int
1045 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1046 {
1047         struct lcs_buffer *buffer;
1048         struct lcs_cmd *cmd;
1049
1050         LCS_DBF_TEXT(2, trace, "cmddelim");
1051         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1052         cmd = (struct lcs_cmd *) buffer->data;
1053         cmd->cmd_code = LCS_CMD_DELIPM;
1054         cmd->initiator = LCS_INITIATOR_TCPIP;
1055         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1056         cmd->cmd.lcs_qipassist.portno = card->portno;
1057         cmd->cmd.lcs_qipassist.version = 4;
1058         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1059         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1060                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1061         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1062         return lcs_send_lancmd(card, buffer, NULL);
1063 }
1064
1065 /**
1066  * check if multicast is supported by LCS
1067  */
1068 static void
1069 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1070 {
1071         LCS_DBF_TEXT(2, trace, "chkmccb");
1072         card->ip_assists_supported =
1073                 cmd->cmd.lcs_qipassist.ip_assists_supported;
1074         card->ip_assists_enabled =
1075                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1076 }
1077
1078 static int
1079 lcs_check_multicast_support(struct lcs_card *card)
1080 {
1081         struct lcs_buffer *buffer;
1082         struct lcs_cmd *cmd;
1083         int rc;
1084
1085         LCS_DBF_TEXT(2, trace, "cmdqipa");
1086         /* Send query ipassist. */
1087         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1088         cmd = (struct lcs_cmd *) buffer->data;
1089         cmd->cmd_code = LCS_CMD_QIPASSIST;
1090         cmd->initiator = LCS_INITIATOR_TCPIP;
1091         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1092         cmd->cmd.lcs_qipassist.portno = card->portno;
1093         cmd->cmd.lcs_qipassist.version = 4;
1094         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1095         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1096         if (rc != 0) {
1097                 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1098                 return -EOPNOTSUPP;
1099         }
1100         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1101                 return 0;
1102         return -EOPNOTSUPP;
1103 }
1104
1105 /**
1106  * set or del multicast address on LCS card
1107  */
1108 static void
1109 lcs_fix_multicast_list(struct lcs_card *card)
1110 {
1111         struct list_head failed_list;
1112         struct lcs_ipm_list *ipm, *tmp;
1113         unsigned long flags;
1114         int rc;
1115
1116         LCS_DBF_TEXT(4,trace, "fixipm");
1117         INIT_LIST_HEAD(&failed_list);
1118         spin_lock_irqsave(&card->ipm_lock, flags);
1119 list_modified:
1120         list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1121                 switch (ipm->ipm_state) {
1122                 case LCS_IPM_STATE_SET_REQUIRED:
1123                         /* del from ipm_list so noone else can tamper with
1124                          * this entry */
1125                         list_del_init(&ipm->list);
1126                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1127                         rc = lcs_send_setipm(card, ipm);
1128                         spin_lock_irqsave(&card->ipm_lock, flags);
1129                         if (rc) {
1130                                 pr_info("Adding multicast address failed."
1131                                         " Table possibly full!\n");
1132                                 /* store ipm in failed list -> will be added
1133                                  * to ipm_list again, so a retry will be done
1134                                  * during the next call of this function */
1135                                 list_add_tail(&ipm->list, &failed_list);
1136                         } else {
1137                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1138                                 /* re-insert into ipm_list */
1139                                 list_add_tail(&ipm->list, &card->ipm_list);
1140                         }
1141                         goto list_modified;
1142                 case LCS_IPM_STATE_DEL_REQUIRED:
1143                         list_del(&ipm->list);
1144                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1145                         lcs_send_delipm(card, ipm);
1146                         spin_lock_irqsave(&card->ipm_lock, flags);
1147                         kfree(ipm);
1148                         goto list_modified;
1149                 case LCS_IPM_STATE_ON_CARD:
1150                         break;
1151                 }
1152         }
1153         /* re-insert all entries from the failed_list into ipm_list */
1154         list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1155                 list_move_tail(&ipm->list, &card->ipm_list);
1156
1157         spin_unlock_irqrestore(&card->ipm_lock, flags);
1158 }
1159
1160 /**
1161  * get mac address for the relevant Multicast address
1162  */
1163 static void
1164 lcs_get_mac_for_ipm(__be32 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                         kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1241                 if (ipm == NULL) {
1242                         pr_info("Not enough memory to add"
1243                                 " new multicast entry!\n");
1244                         break;
1245                 }
1246                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1247                 ipm->ipm.ip_addr = im4->multiaddr;
1248                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1249                 spin_lock_irqsave(&card->ipm_lock, flags);
1250                 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
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
1264         if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1265                 return 0;
1266         LCS_DBF_TEXT(4, trace, "regmulti");
1267
1268         in4_dev = in_dev_get(card->dev);
1269         if (in4_dev == NULL)
1270                 goto out;
1271         read_lock(&in4_dev->mc_list_lock);
1272         lcs_remove_mc_addresses(card,in4_dev);
1273         lcs_set_mc_addresses(card, in4_dev);
1274         read_unlock(&in4_dev->mc_list_lock);
1275         in_dev_put(in4_dev);
1276
1277         netif_carrier_off(card->dev);
1278         netif_tx_disable(card->dev);
1279         wait_event(card->write.wait_q,
1280                         (card->write.state != LCS_CH_STATE_RUNNING));
1281         lcs_fix_multicast_list(card);
1282         if (card->state == DEV_STATE_UP) {
1283                 netif_carrier_on(card->dev);
1284                 netif_wake_queue(card->dev);
1285         }
1286 out:
1287         lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1288         return 0;
1289 }
1290 #endif /* CONFIG_IP_MULTICAST */
1291
1292 /**
1293  * function called by net device to
1294  * handle multicast address relevant things
1295  */
1296 static void
1297 lcs_set_multicast_list(struct net_device *dev)
1298 {
1299 #ifdef CONFIG_IP_MULTICAST
1300         struct lcs_card *card;
1301
1302         LCS_DBF_TEXT(4, trace, "setmulti");
1303         card = (struct lcs_card *) dev->ml_priv;
1304
1305         if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1306                 schedule_work(&card->kernel_thread_starter);
1307 #endif /* CONFIG_IP_MULTICAST */
1308 }
1309
1310 static long
1311 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1312 {
1313         if (!IS_ERR(irb))
1314                 return 0;
1315
1316         switch (PTR_ERR(irb)) {
1317         case -EIO:
1318                 dev_warn(&cdev->dev,
1319                         "An I/O-error occurred on the LCS device\n");
1320                 LCS_DBF_TEXT(2, trace, "ckirberr");
1321                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1322                 break;
1323         case -ETIMEDOUT:
1324                 dev_warn(&cdev->dev,
1325                         "A command timed out on the LCS device\n");
1326                 LCS_DBF_TEXT(2, trace, "ckirberr");
1327                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1328                 break;
1329         default:
1330                 dev_warn(&cdev->dev,
1331                         "An error occurred on the LCS device, rc=%ld\n",
1332                         PTR_ERR(irb));
1333                 LCS_DBF_TEXT(2, trace, "ckirberr");
1334                 LCS_DBF_TEXT(2, trace, "  rc???");
1335         }
1336         return PTR_ERR(irb);
1337 }
1338
1339 static int
1340 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1341 {
1342         int dstat, cstat;
1343         char *sense;
1344
1345         sense = (char *) irb->ecw;
1346         cstat = irb->scsw.cmd.cstat;
1347         dstat = irb->scsw.cmd.dstat;
1348
1349         if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1350                      SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1351                      SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
1352                 LCS_DBF_TEXT(2, trace, "CGENCHK");
1353                 return 1;
1354         }
1355         if (dstat & DEV_STAT_UNIT_CHECK) {
1356                 if (sense[LCS_SENSE_BYTE_1] &
1357                     LCS_SENSE_RESETTING_EVENT) {
1358                         LCS_DBF_TEXT(2, trace, "REVIND");
1359                         return 1;
1360                 }
1361                 if (sense[LCS_SENSE_BYTE_0] &
1362                     LCS_SENSE_CMD_REJECT) {
1363                         LCS_DBF_TEXT(2, trace, "CMDREJ");
1364                         return 0;
1365                 }
1366                 if ((!sense[LCS_SENSE_BYTE_0]) &&
1367                     (!sense[LCS_SENSE_BYTE_1]) &&
1368                     (!sense[LCS_SENSE_BYTE_2]) &&
1369                     (!sense[LCS_SENSE_BYTE_3])) {
1370                         LCS_DBF_TEXT(2, trace, "ZEROSEN");
1371                         return 0;
1372                 }
1373                 LCS_DBF_TEXT(2, trace, "DGENCHK");
1374                 return 1;
1375         }
1376         return 0;
1377 }
1378
1379 static void
1380 lcs_schedule_recovery(struct lcs_card *card)
1381 {
1382         LCS_DBF_TEXT(2, trace, "startrec");
1383         if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1384                 schedule_work(&card->kernel_thread_starter);
1385 }
1386
1387 /**
1388  * IRQ Handler for LCS channels
1389  */
1390 static void
1391 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1392 {
1393         struct lcs_card *card;
1394         struct lcs_channel *channel;
1395         int rc, index;
1396         int cstat, dstat;
1397
1398         if (lcs_check_irb_error(cdev, irb))
1399                 return;
1400
1401         card = CARD_FROM_DEV(cdev);
1402         if (card->read.ccwdev == cdev)
1403                 channel = &card->read;
1404         else
1405                 channel = &card->write;
1406
1407         cstat = irb->scsw.cmd.cstat;
1408         dstat = irb->scsw.cmd.dstat;
1409         LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1410         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1411                       irb->scsw.cmd.dstat);
1412         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1413                       irb->scsw.cmd.actl);
1414
1415         /* Check for channel and device errors presented */
1416         rc = lcs_get_problem(cdev, irb);
1417         if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1418                 dev_warn(&cdev->dev,
1419                         "The LCS device stopped because of an error,"
1420                         " dstat=0x%X, cstat=0x%X \n",
1421                             dstat, cstat);
1422                 if (rc) {
1423                         channel->state = LCS_CH_STATE_ERROR;
1424                 }
1425         }
1426         if (channel->state == LCS_CH_STATE_ERROR) {
1427                 lcs_schedule_recovery(card);
1428                 wake_up(&card->wait_q);
1429                 return;
1430         }
1431         /* How far in the ccw chain have we processed? */
1432         if ((channel->state != LCS_CH_STATE_INIT) &&
1433             (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1434             (irb->scsw.cmd.cpa != 0)) {
1435                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1436                         - channel->ccws;
1437                 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1438                     (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1439                         /* Bloody io subsystem tells us lies about cpa... */
1440                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1441                 while (channel->io_idx != index) {
1442                         __lcs_processed_buffer(channel,
1443                                                channel->iob + channel->io_idx);
1444                         channel->io_idx =
1445                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1446                 }
1447         }
1448
1449         if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1450             (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1451             (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1452                 /* Mark channel as stopped. */
1453                 channel->state = LCS_CH_STATE_STOPPED;
1454         else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1455                 /* CCW execution stopped on a suspend bit. */
1456                 channel->state = LCS_CH_STATE_SUSPENDED;
1457         if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1458                 if (irb->scsw.cmd.cc != 0) {
1459                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1460                         return;
1461                 }
1462                 /* The channel has been stopped by halt_IO. */
1463                 channel->state = LCS_CH_STATE_HALTED;
1464         }
1465         if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1466                 channel->state = LCS_CH_STATE_CLEARED;
1467         /* Do the rest in the tasklet. */
1468         tasklet_schedule(&channel->irq_tasklet);
1469 }
1470
1471 /**
1472  * Tasklet for IRQ handler
1473  */
1474 static void
1475 lcs_tasklet(unsigned long data)
1476 {
1477         unsigned long flags;
1478         struct lcs_channel *channel;
1479         struct lcs_buffer *iob;
1480         int buf_idx;
1481         int rc;
1482
1483         channel = (struct lcs_channel *) data;
1484         LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1485
1486         /* Check for processed buffers. */
1487         iob = channel->iob;
1488         buf_idx = channel->buf_idx;
1489         while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1490                 /* Do the callback thing. */
1491                 if (iob[buf_idx].callback != NULL)
1492                         iob[buf_idx].callback(channel, iob + buf_idx);
1493                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1494         }
1495         channel->buf_idx = buf_idx;
1496
1497         if (channel->state == LCS_CH_STATE_STOPPED)
1498                 // FIXME: what if rc != 0 ??
1499                 rc = lcs_start_channel(channel);
1500         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1501         if (channel->state == LCS_CH_STATE_SUSPENDED &&
1502             channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) {
1503                 // FIXME: what if rc != 0 ??
1504                 rc = __lcs_resume_channel(channel);
1505         }
1506         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1507
1508         /* Something happened on the channel. Wake up waiters. */
1509         wake_up(&channel->wait_q);
1510 }
1511
1512 /**
1513  * Finish current tx buffer and make it ready for transmit.
1514  */
1515 static void
1516 __lcs_emit_txbuffer(struct lcs_card *card)
1517 {
1518         LCS_DBF_TEXT(5, trace, "emittx");
1519         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1520         card->tx_buffer->count += 2;
1521         lcs_ready_buffer(&card->write, card->tx_buffer);
1522         card->tx_buffer = NULL;
1523         card->tx_emitted++;
1524 }
1525
1526 /**
1527  * Callback for finished tx buffers.
1528  */
1529 static void
1530 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1531 {
1532         struct lcs_card *card;
1533
1534         LCS_DBF_TEXT(5, trace, "txbuffcb");
1535         /* Put buffer back to pool. */
1536         lcs_release_buffer(channel, buffer);
1537         card = container_of(channel, struct lcs_card, write);
1538         if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1539                 netif_wake_queue(card->dev);
1540         spin_lock(&card->lock);
1541         card->tx_emitted--;
1542         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1543                 /*
1544                  * Last running tx buffer has finished. Submit partially
1545                  * filled current buffer.
1546                  */
1547                 __lcs_emit_txbuffer(card);
1548         spin_unlock(&card->lock);
1549 }
1550
1551 /**
1552  * Packet transmit function called by network stack
1553  */
1554 static int
1555 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1556                  struct net_device *dev)
1557 {
1558         struct lcs_header *header;
1559         int rc = 0;
1560
1561         LCS_DBF_TEXT(5, trace, "hardxmit");
1562         if (skb == NULL) {
1563                 card->stats.tx_dropped++;
1564                 card->stats.tx_errors++;
1565                 return 0;
1566         }
1567         if (card->state != DEV_STATE_UP) {
1568                 dev_kfree_skb(skb);
1569                 card->stats.tx_dropped++;
1570                 card->stats.tx_errors++;
1571                 card->stats.tx_carrier_errors++;
1572                 return 0;
1573         }
1574         if (skb->protocol == htons(ETH_P_IPV6)) {
1575                 dev_kfree_skb(skb);
1576                 return 0;
1577         }
1578         netif_stop_queue(card->dev);
1579         spin_lock(&card->lock);
1580         if (card->tx_buffer != NULL &&
1581             card->tx_buffer->count + sizeof(struct lcs_header) +
1582             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1583                 /* skb too big for current tx buffer. */
1584                 __lcs_emit_txbuffer(card);
1585         if (card->tx_buffer == NULL) {
1586                 /* Get new tx buffer */
1587                 card->tx_buffer = lcs_get_buffer(&card->write);
1588                 if (card->tx_buffer == NULL) {
1589                         card->stats.tx_dropped++;
1590                         rc = NETDEV_TX_BUSY;
1591                         goto out;
1592                 }
1593                 card->tx_buffer->callback = lcs_txbuffer_cb;
1594                 card->tx_buffer->count = 0;
1595         }
1596         header = (struct lcs_header *)
1597                 (card->tx_buffer->data + card->tx_buffer->count);
1598         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1599         header->offset = card->tx_buffer->count;
1600         header->type = card->lan_type;
1601         header->slot = card->portno;
1602         skb_copy_from_linear_data(skb, header + 1, skb->len);
1603         spin_unlock(&card->lock);
1604         card->stats.tx_bytes += skb->len;
1605         card->stats.tx_packets++;
1606         dev_kfree_skb(skb);
1607         netif_wake_queue(card->dev);
1608         spin_lock(&card->lock);
1609         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1610                 /* If this is the first tx buffer emit it immediately. */
1611                 __lcs_emit_txbuffer(card);
1612 out:
1613         spin_unlock(&card->lock);
1614         return rc;
1615 }
1616
1617 static int
1618 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1619 {
1620         struct lcs_card *card;
1621         int rc;
1622
1623         LCS_DBF_TEXT(5, trace, "pktxmit");
1624         card = (struct lcs_card *) dev->ml_priv;
1625         rc = __lcs_start_xmit(card, skb, dev);
1626         return rc;
1627 }
1628
1629 /**
1630  * send startlan and lanstat command to make LCS device ready
1631  */
1632 static int
1633 lcs_startlan_auto(struct lcs_card *card)
1634 {
1635         int rc;
1636
1637         LCS_DBF_TEXT(2, trace, "strtauto");
1638 #ifdef CONFIG_NET_ETHERNET
1639         card->lan_type = LCS_FRAME_TYPE_ENET;
1640         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1641         if (rc == 0)
1642                 return 0;
1643
1644 #endif
1645 #ifdef CONFIG_TR
1646         card->lan_type = LCS_FRAME_TYPE_TR;
1647         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1648         if (rc == 0)
1649                 return 0;
1650 #endif
1651 #ifdef CONFIG_FDDI
1652         card->lan_type = LCS_FRAME_TYPE_FDDI;
1653         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1654         if (rc == 0)
1655                 return 0;
1656 #endif
1657         return -EIO;
1658 }
1659
1660 static int
1661 lcs_startlan(struct lcs_card *card)
1662 {
1663         int rc, i;
1664
1665         LCS_DBF_TEXT(2, trace, "startlan");
1666         rc = 0;
1667         if (card->portno != LCS_INVALID_PORT_NO) {
1668                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1669                         rc = lcs_startlan_auto(card);
1670                 else
1671                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1672         } else {
1673                 for (i = 0; i <= 16; i++) {
1674                         card->portno = i;
1675                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1676                                 rc = lcs_send_startlan(card,
1677                                                        LCS_INITIATOR_TCPIP);
1678                         else
1679                                 /* autodetecting lan type */
1680                                 rc = lcs_startlan_auto(card);
1681                         if (rc == 0)
1682                                 break;
1683                 }
1684         }
1685         if (rc == 0)
1686                 return lcs_send_lanstat(card);
1687         return rc;
1688 }
1689
1690 /**
1691  * LCS detect function
1692  * setup channels and make them I/O ready
1693  */
1694 static int
1695 lcs_detect(struct lcs_card *card)
1696 {
1697         int rc = 0;
1698
1699         LCS_DBF_TEXT(2, setup, "lcsdetct");
1700         /* start/reset card */
1701         if (card->dev)
1702                 netif_stop_queue(card->dev);
1703         rc = lcs_stop_channels(card);
1704         if (rc == 0) {
1705                 rc = lcs_start_channels(card);
1706                 if (rc == 0) {
1707                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1708                         if (rc == 0)
1709                                 rc = lcs_startlan(card);
1710                 }
1711         }
1712         if (rc == 0) {
1713                 card->state = DEV_STATE_UP;
1714         } else {
1715                 card->state = DEV_STATE_DOWN;
1716                 card->write.state = LCS_CH_STATE_INIT;
1717                 card->read.state =  LCS_CH_STATE_INIT;
1718         }
1719         return rc;
1720 }
1721
1722 /**
1723  * LCS Stop card
1724  */
1725 static int
1726 lcs_stopcard(struct lcs_card *card)
1727 {
1728         int rc;
1729
1730         LCS_DBF_TEXT(3, setup, "stopcard");
1731
1732         if (card->read.state != LCS_CH_STATE_STOPPED &&
1733             card->write.state != LCS_CH_STATE_STOPPED &&
1734             card->read.state != LCS_CH_STATE_ERROR &&
1735             card->write.state != LCS_CH_STATE_ERROR &&
1736             card->state == DEV_STATE_UP) {
1737                 lcs_clear_multicast_list(card);
1738                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1739                 rc = lcs_send_shutdown(card);
1740         }
1741         rc = lcs_stop_channels(card);
1742         card->state = DEV_STATE_DOWN;
1743
1744         return rc;
1745 }
1746
1747 /**
1748  * Kernel Thread helper functions for LGW initiated commands
1749  */
1750 static void
1751 lcs_start_kernel_thread(struct work_struct *work)
1752 {
1753         struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1754         LCS_DBF_TEXT(5, trace, "krnthrd");
1755         if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1756                 kthread_run(lcs_recovery, card, "lcs_recover");
1757 #ifdef CONFIG_IP_MULTICAST
1758         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1759                 kthread_run(lcs_register_mc_addresses, card, "regipm");
1760 #endif
1761 }
1762
1763 /**
1764  * Process control frames.
1765  */
1766 static void
1767 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1768 {
1769         LCS_DBF_TEXT(5, trace, "getctrl");
1770         if (cmd->initiator == LCS_INITIATOR_LGW) {
1771                 switch(cmd->cmd_code) {
1772                 case LCS_CMD_STARTUP:
1773                 case LCS_CMD_STARTLAN:
1774                         lcs_schedule_recovery(card);
1775                         break;
1776                 case LCS_CMD_STOPLAN:
1777                         pr_warning("Stoplan for %s initiated by LGW.\n",
1778                                    card->dev->name);
1779                         if (card->dev)
1780                                 netif_carrier_off(card->dev);
1781                         break;
1782                 default:
1783                         LCS_DBF_TEXT(5, trace, "noLGWcmd");
1784                         break;
1785                 }
1786         } else
1787                 lcs_notify_lancmd_waiters(card, cmd);
1788 }
1789
1790 /**
1791  * Unpack network packet.
1792  */
1793 static void
1794 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1795 {
1796         struct sk_buff *skb;
1797
1798         LCS_DBF_TEXT(5, trace, "getskb");
1799         if (card->dev == NULL ||
1800             card->state != DEV_STATE_UP)
1801                 /* The card isn't up. Ignore the packet. */
1802                 return;
1803
1804         skb = dev_alloc_skb(skb_len);
1805         if (skb == NULL) {
1806                 dev_err(&card->dev->dev,
1807                         " Allocating a socket buffer to interface %s failed\n",
1808                           card->dev->name);
1809                 card->stats.rx_dropped++;
1810                 return;
1811         }
1812         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1813         skb->protocol = card->lan_type_trans(skb, card->dev);
1814         card->stats.rx_bytes += skb_len;
1815         card->stats.rx_packets++;
1816         if (skb->protocol == htons(ETH_P_802_2))
1817                 *((__u32 *)skb->cb) = ++card->pkt_seq;
1818         netif_rx(skb);
1819 }
1820
1821 /**
1822  * LCS main routine to get packets and lancmd replies from the buffers
1823  */
1824 static void
1825 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1826 {
1827         struct lcs_card *card;
1828         struct lcs_header *lcs_hdr;
1829         __u16 offset;
1830
1831         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1832         lcs_hdr = (struct lcs_header *) buffer->data;
1833         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1834                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1835                 return;
1836         }
1837         card = container_of(channel, struct lcs_card, read);
1838         offset = 0;
1839         while (lcs_hdr->offset != 0) {
1840                 if (lcs_hdr->offset <= 0 ||
1841                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1842                     lcs_hdr->offset < offset) {
1843                         /* Offset invalid. */
1844                         card->stats.rx_length_errors++;
1845                         card->stats.rx_errors++;
1846                         return;
1847                 }
1848                 /* What kind of frame is it? */
1849                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1850                         /* Control frame. */
1851                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1852                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1853                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1854                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1855                         /* Normal network packet. */
1856                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1857                                     lcs_hdr->offset - offset -
1858                                     sizeof(struct lcs_header));
1859                 else
1860                         /* Unknown frame type. */
1861                         ; // FIXME: error message ?
1862                 /* Proceed to next frame. */
1863                 offset = lcs_hdr->offset;
1864                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1865                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1866         }
1867         /* The buffer is now empty. Make it ready again. */
1868         lcs_ready_buffer(&card->read, buffer);
1869 }
1870
1871 /**
1872  * get network statistics for ifconfig and other user programs
1873  */
1874 static struct net_device_stats *
1875 lcs_getstats(struct net_device *dev)
1876 {
1877         struct lcs_card *card;
1878
1879         LCS_DBF_TEXT(4, trace, "netstats");
1880         card = (struct lcs_card *) dev->ml_priv;
1881         return &card->stats;
1882 }
1883
1884 /**
1885  * stop lcs device
1886  * This function will be called by user doing ifconfig xxx down
1887  */
1888 static int
1889 lcs_stop_device(struct net_device *dev)
1890 {
1891         struct lcs_card *card;
1892         int rc;
1893
1894         LCS_DBF_TEXT(2, trace, "stopdev");
1895         card   = (struct lcs_card *) dev->ml_priv;
1896         netif_carrier_off(dev);
1897         netif_tx_disable(dev);
1898         dev->flags &= ~IFF_UP;
1899         wait_event(card->write.wait_q,
1900                 (card->write.state != LCS_CH_STATE_RUNNING));
1901         rc = lcs_stopcard(card);
1902         if (rc)
1903                 dev_err(&card->dev->dev,
1904                         " Shutting down the LCS device failed\n ");
1905         return rc;
1906 }
1907
1908 /**
1909  * start lcs device and make it runnable
1910  * This function will be called by user doing ifconfig xxx up
1911  */
1912 static int
1913 lcs_open_device(struct net_device *dev)
1914 {
1915         struct lcs_card *card;
1916         int rc;
1917
1918         LCS_DBF_TEXT(2, trace, "opendev");
1919         card = (struct lcs_card *) dev->ml_priv;
1920         /* initialize statistics */
1921         rc = lcs_detect(card);
1922         if (rc) {
1923                 pr_err("Error in opening device!\n");
1924
1925         } else {
1926                 dev->flags |= IFF_UP;
1927                 netif_carrier_on(dev);
1928                 netif_wake_queue(dev);
1929                 card->state = DEV_STATE_UP;
1930         }
1931         return rc;
1932 }
1933
1934 /**
1935  * show function for portno called by cat or similar things
1936  */
1937 static ssize_t
1938 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1939 {
1940         struct lcs_card *card;
1941
1942         card = (struct lcs_card *)dev->driver_data;
1943
1944         if (!card)
1945                 return 0;
1946
1947         return sprintf(buf, "%d\n", card->portno);
1948 }
1949
1950 /**
1951  * store the value which is piped to file portno
1952  */
1953 static ssize_t
1954 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1955 {
1956         struct lcs_card *card;
1957         int value;
1958
1959         card = (struct lcs_card *)dev->driver_data;
1960
1961         if (!card)
1962                 return 0;
1963
1964         sscanf(buf, "%u", &value);
1965         /* TODO: sanity checks */
1966         card->portno = value;
1967
1968         return count;
1969
1970 }
1971
1972 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1973
1974 static ssize_t
1975 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1976 {
1977         struct ccwgroup_device *cgdev;
1978
1979         cgdev = to_ccwgroupdev(dev);
1980         if (!cgdev)
1981                 return -ENODEV;
1982
1983         return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
1984 }
1985
1986 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1987
1988 static ssize_t
1989 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1990 {
1991         struct lcs_card *card;
1992
1993         card = (struct lcs_card *)dev->driver_data;
1994
1995         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1996 }
1997
1998 static ssize_t
1999 lcs_timeout_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->lancmd_timeout = value;
2012
2013         return count;
2014
2015 }
2016
2017 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2018
2019 static ssize_t
2020 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2021                       const char *buf, size_t count)
2022 {
2023         struct lcs_card *card = dev->driver_data;
2024         char *tmp;
2025         int i;
2026
2027         if (!card)
2028                 return -EINVAL;
2029         if (card->state != DEV_STATE_UP)
2030                 return -EPERM;
2031         i = simple_strtoul(buf, &tmp, 16);
2032         if (i == 1)
2033                 lcs_schedule_recovery(card);
2034         return count;
2035 }
2036
2037 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2038
2039 static struct attribute * lcs_attrs[] = {
2040         &dev_attr_portno.attr,
2041         &dev_attr_type.attr,
2042         &dev_attr_lancmd_timeout.attr,
2043         &dev_attr_recover.attr,
2044         NULL,
2045 };
2046
2047 static struct attribute_group lcs_attr_group = {
2048         .attrs = lcs_attrs,
2049 };
2050
2051 /**
2052  * lcs_probe_device is called on establishing a new ccwgroup_device.
2053  */
2054 static int
2055 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2056 {
2057         struct lcs_card *card;
2058         int ret;
2059
2060         if (!get_device(&ccwgdev->dev))
2061                 return -ENODEV;
2062
2063         LCS_DBF_TEXT(2, setup, "add_dev");
2064         card = lcs_alloc_card();
2065         if (!card) {
2066                 LCS_DBF_TEXT_(2, setup, "  rc%d", -ENOMEM);
2067                 put_device(&ccwgdev->dev);
2068                 return -ENOMEM;
2069         }
2070         ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2071         if (ret) {
2072                 lcs_free_card(card);
2073                 put_device(&ccwgdev->dev);
2074                 return ret;
2075         }
2076         ccwgdev->dev.driver_data = card;
2077         ccwgdev->cdev[0]->handler = lcs_irq;
2078         ccwgdev->cdev[1]->handler = lcs_irq;
2079         card->gdev = ccwgdev;
2080         INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2081         card->thread_start_mask = 0;
2082         card->thread_allowed_mask = 0;
2083         card->thread_running_mask = 0;
2084         return 0;
2085 }
2086
2087 static int
2088 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2089 {
2090         struct lcs_card *card;
2091
2092         LCS_DBF_TEXT(2, setup, "regnetdv");
2093         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2094         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2095                 return 0;
2096         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2097         return register_netdev(card->dev);
2098 }
2099
2100 /**
2101  * lcs_new_device will be called by setting the group device online.
2102  */
2103 static const struct net_device_ops lcs_netdev_ops = {
2104         .ndo_open               = lcs_open_device,
2105         .ndo_stop               = lcs_stop_device,
2106         .ndo_get_stats          = lcs_getstats,
2107         .ndo_start_xmit         = lcs_start_xmit,
2108 };
2109
2110 static const struct net_device_ops lcs_mc_netdev_ops = {
2111         .ndo_open               = lcs_open_device,
2112         .ndo_stop               = lcs_stop_device,
2113         .ndo_get_stats          = lcs_getstats,
2114         .ndo_start_xmit         = lcs_start_xmit,
2115         .ndo_set_multicast_list = lcs_set_multicast_list,
2116 };
2117
2118 static int
2119 lcs_new_device(struct ccwgroup_device *ccwgdev)
2120 {
2121         struct  lcs_card *card;
2122         struct net_device *dev=NULL;
2123         enum lcs_dev_states recover_state;
2124         int rc;
2125
2126         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2127         if (!card)
2128                 return -ENODEV;
2129
2130         LCS_DBF_TEXT(2, setup, "newdev");
2131         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2132         card->read.ccwdev  = ccwgdev->cdev[0];
2133         card->write.ccwdev = ccwgdev->cdev[1];
2134
2135         recover_state = card->state;
2136         ccw_device_set_online(card->read.ccwdev);
2137         ccw_device_set_online(card->write.ccwdev);
2138
2139         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2140
2141         lcs_setup_card(card);
2142         rc = lcs_detect(card);
2143         if (rc) {
2144                 LCS_DBF_TEXT(2, setup, "dtctfail");
2145                 dev_err(&card->dev->dev,
2146                         "Detecting a network adapter for LCS devices"
2147                         " failed with rc=%d (0x%x)\n", rc, rc);
2148                 lcs_stopcard(card);
2149                 goto out;
2150         }
2151         if (card->dev) {
2152                 LCS_DBF_TEXT(2, setup, "samedev");
2153                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2154                 goto netdev_out;
2155         }
2156         switch (card->lan_type) {
2157 #ifdef CONFIG_NET_ETHERNET
2158         case LCS_FRAME_TYPE_ENET:
2159                 card->lan_type_trans = eth_type_trans;
2160                 dev = alloc_etherdev(0);
2161                 break;
2162 #endif
2163 #ifdef CONFIG_TR
2164         case LCS_FRAME_TYPE_TR:
2165                 card->lan_type_trans = tr_type_trans;
2166                 dev = alloc_trdev(0);
2167                 break;
2168 #endif
2169 #ifdef CONFIG_FDDI
2170         case LCS_FRAME_TYPE_FDDI:
2171                 card->lan_type_trans = fddi_type_trans;
2172                 dev = alloc_fddidev(0);
2173                 break;
2174 #endif
2175         default:
2176                 LCS_DBF_TEXT(3, setup, "errinit");
2177                 pr_err(" Initialization failed\n");
2178                 goto out;
2179         }
2180         if (!dev)
2181                 goto out;
2182         card->dev = dev;
2183         card->dev->ml_priv = card;
2184         card->dev->netdev_ops = &lcs_netdev_ops;
2185         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2186 #ifdef CONFIG_IP_MULTICAST
2187         if (!lcs_check_multicast_support(card))
2188                 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2189 #endif
2190 netdev_out:
2191         lcs_set_allowed_threads(card,0xffffffff);
2192         if (recover_state == DEV_STATE_RECOVER) {
2193                 lcs_set_multicast_list(card->dev);
2194                 card->dev->flags |= IFF_UP;
2195                 netif_carrier_on(card->dev);
2196                 netif_wake_queue(card->dev);
2197                 card->state = DEV_STATE_UP;
2198         } else {
2199                 lcs_stopcard(card);
2200         }
2201
2202         if (lcs_register_netdev(ccwgdev) != 0)
2203                 goto out;
2204
2205         /* Print out supported assists: IPv6 */
2206         pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2207                 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2208                 "with" : "without");
2209         /* Print out supported assist: Multicast */
2210         pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2211                 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2212                 "with" : "without");
2213         return 0;
2214 out:
2215
2216         ccw_device_set_offline(card->read.ccwdev);
2217         ccw_device_set_offline(card->write.ccwdev);
2218         return -ENODEV;
2219 }
2220
2221 /**
2222  * lcs_shutdown_device, called when setting the group device offline.
2223  */
2224 static int
2225 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2226 {
2227         struct lcs_card *card;
2228         enum lcs_dev_states recover_state;
2229         int ret;
2230
2231         LCS_DBF_TEXT(3, setup, "shtdndev");
2232         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2233         if (!card)
2234                 return -ENODEV;
2235         if (recovery_mode == 0) {
2236                 lcs_set_allowed_threads(card, 0);
2237                 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2238                         return -ERESTARTSYS;
2239         }
2240         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2241         recover_state = card->state;
2242
2243         ret = lcs_stop_device(card->dev);
2244         ret = ccw_device_set_offline(card->read.ccwdev);
2245         ret = ccw_device_set_offline(card->write.ccwdev);
2246         if (recover_state == DEV_STATE_UP) {
2247                 card->state = DEV_STATE_RECOVER;
2248         }
2249         if (ret)
2250                 return ret;
2251         return 0;
2252 }
2253
2254 static int
2255 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2256 {
2257         return __lcs_shutdown_device(ccwgdev, 0);
2258 }
2259
2260 /**
2261  * drive lcs recovery after startup and startlan initiated by Lan Gateway
2262  */
2263 static int
2264 lcs_recovery(void *ptr)
2265 {
2266         struct lcs_card *card;
2267         struct ccwgroup_device *gdev;
2268         int rc;
2269
2270         card = (struct lcs_card *) ptr;
2271
2272         LCS_DBF_TEXT(4, trace, "recover1");
2273         if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2274                 return 0;
2275         LCS_DBF_TEXT(4, trace, "recover2");
2276         gdev = card->gdev;
2277         dev_warn(&gdev->dev,
2278                 "A recovery process has been started for the LCS device\n");
2279         rc = __lcs_shutdown_device(gdev, 1);
2280         rc = lcs_new_device(gdev);
2281         if (!rc)
2282                 pr_info("Device %s successfully recovered!\n",
2283                         card->dev->name);
2284         else
2285                 pr_info("Device %s could not be recovered!\n",
2286                         card->dev->name);
2287         lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2288         return 0;
2289 }
2290
2291 /**
2292  * lcs_remove_device, free buffers and card
2293  */
2294 static void
2295 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2296 {
2297         struct lcs_card *card;
2298
2299         card = (struct lcs_card *)ccwgdev->dev.driver_data;
2300         if (!card)
2301                 return;
2302
2303         LCS_DBF_TEXT(3, setup, "remdev");
2304         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2305         if (ccwgdev->state == CCWGROUP_ONLINE) {
2306                 lcs_shutdown_device(ccwgdev);
2307         }
2308         if (card->dev)
2309                 unregister_netdev(card->dev);
2310         sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2311         lcs_cleanup_card(card);
2312         lcs_free_card(card);
2313         put_device(&ccwgdev->dev);
2314 }
2315
2316 /**
2317  * LCS ccwgroup driver registration
2318  */
2319 static struct ccwgroup_driver lcs_group_driver = {
2320         .owner       = THIS_MODULE,
2321         .name        = "lcs",
2322         .max_slaves  = 2,
2323         .driver_id   = 0xD3C3E2,
2324         .probe       = lcs_probe_device,
2325         .remove      = lcs_remove_device,
2326         .set_online  = lcs_new_device,
2327         .set_offline = lcs_shutdown_device,
2328 };
2329
2330 /**
2331  *  LCS Module/Kernel initialization function
2332  */
2333 static int
2334 __init lcs_init_module(void)
2335 {
2336         int rc;
2337
2338         pr_info("Loading %s\n", version);
2339         rc = lcs_register_debug_facility();
2340         LCS_DBF_TEXT(0, setup, "lcsinit");
2341         if (rc) {
2342                 pr_err("Initialization failed\n");
2343                 return rc;
2344         }
2345
2346         rc = register_cu3088_discipline(&lcs_group_driver);
2347         if (rc) {
2348                 pr_err("Initialization failed\n");
2349                 return rc;
2350         }
2351         return 0;
2352 }
2353
2354
2355 /**
2356  *  LCS module cleanup function
2357  */
2358 static void
2359 __exit lcs_cleanup_module(void)
2360 {
2361         pr_info("Terminating lcs module.\n");
2362         LCS_DBF_TEXT(0, trace, "cleanup");
2363         unregister_cu3088_discipline(&lcs_group_driver);
2364         lcs_unregister_debug_facility();
2365 }
2366
2367 module_init(lcs_init_module);
2368 module_exit(lcs_cleanup_module);
2369
2370 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2371 MODULE_LICENSE("GPL");
2372