1/*
   2 *  Linux for S/390 Lan Channel Station Network Driver
   3 *
   4 *  Copyright IBM Corp. 1999, 2009
   5 *  Author(s): Original Code written by
   6 *			DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
   7 *	       Rewritten by
   8 *			Frank Pavlic <fpavlic@de.ibm.com> and
   9 *			Martin Schwidefsky <schwidefsky@de.ibm.com>
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2, or (at your option)
  14 * any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26#define KMSG_COMPONENT		"lcs"
  27#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  28
  29#include <linux/kernel_stat.h>
  30#include <linux/module.h>
  31#include <linux/if.h>
  32#include <linux/netdevice.h>
  33#include <linux/etherdevice.h>
  34#include <linux/trdevice.h>
  35#include <linux/fddidevice.h>
  36#include <linux/inetdevice.h>
  37#include <linux/in.h>
  38#include <linux/igmp.h>
  39#include <linux/delay.h>
  40#include <linux/kthread.h>
  41#include <linux/slab.h>
  42#include <net/arp.h>
  43#include <net/ip.h>
  44
  45#include <asm/debug.h>
  46#include <asm/idals.h>
  47#include <asm/timex.h>
  48#include <linux/device.h>
  49#include <asm/ccwgroup.h>
  50
  51#include "lcs.h"
  52
  53
  54#if !defined(CONFIG_NET_ETHERNET) && \
  55    !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
  56#error Cannot compile lcs.c without some net devices switched on.
  57#endif
  58
  59/**
  60 * initialization string for output
  61 */
  62
  63static char version[] __initdata = "LCS driver";
  64
  65/**
  66  * the root device for lcs group devices
  67  */
  68static struct device *lcs_root_dev;
  69
  70/**
  71 * Some prototypes.
  72 */
  73static void lcs_tasklet(unsigned long);
  74static void lcs_start_kernel_thread(struct work_struct *);
  75static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
  76#ifdef CONFIG_IP_MULTICAST
  77static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
  78#endif /* CONFIG_IP_MULTICAST */
  79static int lcs_recovery(void *ptr);
  80
  81/**
  82 * Debug Facility Stuff
  83 */
  84static char debug_buffer[255];
  85static debug_info_t *lcs_dbf_setup;
  86static debug_info_t *lcs_dbf_trace;
  87
  88/**
  89 *  LCS Debug Facility functions
  90 */
  91static void
  92lcs_unregister_debug_facility(void)
  93{
  94	if (lcs_dbf_setup)
  95		debug_unregister(lcs_dbf_setup);
  96	if (lcs_dbf_trace)
  97		debug_unregister(lcs_dbf_trace);
  98}
  99
 100static int
 101lcs_register_debug_facility(void)
 102{
 103	lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
 104	lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
 105	if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
 106		pr_err("Not enough memory for debug facility.\n");
 107		lcs_unregister_debug_facility();
 108		return -ENOMEM;
 109	}
 110	debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
 111	debug_set_level(lcs_dbf_setup, 2);
 112	debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
 113	debug_set_level(lcs_dbf_trace, 2);
 114	return 0;
 115}
 116
 117/**
 118 * Allocate io buffers.
 119 */
 120static int
 121lcs_alloc_channel(struct lcs_channel *channel)
 122{
 123	int cnt;
 124
 125	LCS_DBF_TEXT(2, setup, "ichalloc");
 126	for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 127		/* alloc memory fo iobuffer */
 128		channel->iob[cnt].data =
 129			kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
 130		if (channel->iob[cnt].data == NULL)
 131			break;
 132		channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
 133	}
 134	if (cnt < LCS_NUM_BUFFS) {
 135		/* Not all io buffers could be allocated. */
 136		LCS_DBF_TEXT(2, setup, "echalloc");
 137		while (cnt-- > 0)
 138			kfree(channel->iob[cnt].data);
 139		return -ENOMEM;
 140	}
 141	return 0;
 142}
 143
 144/**
 145 * Free io buffers.
 146 */
 147static void
 148lcs_free_channel(struct lcs_channel *channel)
 149{
 150	int cnt;
 151
 152	LCS_DBF_TEXT(2, setup, "ichfree");
 153	for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 154		kfree(channel->iob[cnt].data);
 155		channel->iob[cnt].data = NULL;
 156	}
 157}
 158
 159/*
 160 * Cleanup channel.
 161 */
 162static void
 163lcs_cleanup_channel(struct lcs_channel *channel)
 164{
 165	LCS_DBF_TEXT(3, setup, "cleanch");
 166	/* Kill write channel tasklets. */
 167	tasklet_kill(&channel->irq_tasklet);
 168	/* Free channel buffers. */
 169	lcs_free_channel(channel);
 170}
 171
 172/**
 173 * LCS free memory for card and channels.
 174 */
 175static void
 176lcs_free_card(struct lcs_card *card)
 177{
 178	LCS_DBF_TEXT(2, setup, "remcard");
 179	LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 180	kfree(card);
 181}
 182
 183/**
 184 * LCS alloc memory for card and channels
 185 */
 186static struct lcs_card *
 187lcs_alloc_card(void)
 188{
 189	struct lcs_card *card;
 190	int rc;
 191
 192	LCS_DBF_TEXT(2, setup, "alloclcs");
 193
 194	card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
 195	if (card == NULL)
 196		return NULL;
 197	card->lan_type = LCS_FRAME_TYPE_AUTO;
 198	card->pkt_seq = 0;
 199	card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
 200	/* Allocate io buffers for the read channel. */
 201	rc = lcs_alloc_channel(&card->read);
 202	if (rc){
 203		LCS_DBF_TEXT(2, setup, "iccwerr");
 204		lcs_free_card(card);
 205		return NULL;
 206	}
 207	/* Allocate io buffers for the write channel. */
 208	rc = lcs_alloc_channel(&card->write);
 209	if (rc) {
 210		LCS_DBF_TEXT(2, setup, "iccwerr");
 211		lcs_cleanup_channel(&card->read);
 212		lcs_free_card(card);
 213		return NULL;
 214	}
 215
 216#ifdef CONFIG_IP_MULTICAST
 217	INIT_LIST_HEAD(&card->ipm_list);
 218#endif
 219	LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 220	return card;
 221}
 222
 223/*
 224 * Setup read channel.
 225 */
 226static void
 227lcs_setup_read_ccws(struct lcs_card *card)
 228{
 229	int cnt;
 230
 231	LCS_DBF_TEXT(2, setup, "ireadccw");
 232	/* Setup read ccws. */
 233	memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
 234	for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 235		card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
 236		card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
 237		card->read.ccws[cnt].flags =
 238			CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
 239		/*
 240		 * Note: we have allocated the buffer with GFP_DMA, so
 241		 * we do not need to do set_normalized_cda.
 242		 */
 243		card->read.ccws[cnt].cda =
 244			(__u32) __pa(card->read.iob[cnt].data);
 245		((struct lcs_header *)
 246		 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
 247		card->read.iob[cnt].callback = lcs_get_frames_cb;
 248		card->read.iob[cnt].state = LCS_BUF_STATE_READY;
 249		card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
 250	}
 251	card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
 252	card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
 253	card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
 254	/* Last ccw is a tic (transfer in channel). */
 255	card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 256	card->read.ccws[LCS_NUM_BUFFS].cda =
 257		(__u32) __pa(card->read.ccws);
 258	/* Setg initial state of the read channel. */
 259	card->read.state = LCS_CH_STATE_INIT;
 260
 261	card->read.io_idx = 0;
 262	card->read.buf_idx = 0;
 263}
 264
 265static void
 266lcs_setup_read(struct lcs_card *card)
 267{
 268	LCS_DBF_TEXT(3, setup, "initread");
 269
 270	lcs_setup_read_ccws(card);
 271	/* Initialize read channel tasklet. */
 272	card->read.irq_tasklet.data = (unsigned long) &card->read;
 273	card->read.irq_tasklet.func = lcs_tasklet;
 274	/* Initialize waitqueue. */
 275	init_waitqueue_head(&card->read.wait_q);
 276}
 277
 278/*
 279 * Setup write channel.
 280 */
 281static void
 282lcs_setup_write_ccws(struct lcs_card *card)
 283{
 284	int cnt;
 285
 286	LCS_DBF_TEXT(3, setup, "iwritccw");
 287	/* Setup write ccws. */
 288	memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
 289	for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
 290		card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
 291		card->write.ccws[cnt].count = 0;
 292		card->write.ccws[cnt].flags =
 293			CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
 294		/*
 295		 * Note: we have allocated the buffer with GFP_DMA, so
 296		 * we do not need to do set_normalized_cda.
 297		 */
 298		card->write.ccws[cnt].cda =
 299			(__u32) __pa(card->write.iob[cnt].data);
 300	}
 301	/* Last ccw is a tic (transfer in channel). */
 302	card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
 303	card->write.ccws[LCS_NUM_BUFFS].cda =
 304		(__u32) __pa(card->write.ccws);
 305	/* Set initial state of the write channel. */
 306	card->read.state = LCS_CH_STATE_INIT;
 307
 308	card->write.io_idx = 0;
 309	card->write.buf_idx = 0;
 310}
 311
 312static void
 313lcs_setup_write(struct lcs_card *card)
 314{
 315	LCS_DBF_TEXT(3, setup, "initwrit");
 316
 317	lcs_setup_write_ccws(card);
 318	/* Initialize write channel tasklet. */
 319	card->write.irq_tasklet.data = (unsigned long) &card->write;
 320	card->write.irq_tasklet.func = lcs_tasklet;
 321	/* Initialize waitqueue. */
 322	init_waitqueue_head(&card->write.wait_q);
 323}
 324
 325static void
 326lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
 327{
 328	unsigned long flags;
 329
 330	spin_lock_irqsave(&card->mask_lock, flags);
 331	card->thread_allowed_mask = threads;
 332	spin_unlock_irqrestore(&card->mask_lock, flags);
 333	wake_up(&card->wait_q);
 334}
 335static inline int
 336lcs_threads_running(struct lcs_card *card, unsigned long threads)
 337{
 338        unsigned long flags;
 339        int rc = 0;
 340
 341	spin_lock_irqsave(&card->mask_lock, flags);
 342        rc = (card->thread_running_mask & threads);
 343	spin_unlock_irqrestore(&card->mask_lock, flags);
 344        return rc;
 345}
 346
 347static int
 348lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
 349{
 350        return wait_event_interruptible(card->wait_q,
 351                        lcs_threads_running(card, threads) == 0);
 352}
 353
 354static inline int
 355lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
 356{
 357        unsigned long flags;
 358
 359	spin_lock_irqsave(&card->mask_lock, flags);
 360        if ( !(card->thread_allowed_mask & thread) ||
 361              (card->thread_start_mask & thread) ) {
 362                spin_unlock_irqrestore(&card->mask_lock, flags);
 363                return -EPERM;
 364        }
 365        card->thread_start_mask |= thread;
 366	spin_unlock_irqrestore(&card->mask_lock, flags);
 367        return 0;
 368}
 369
 370static void
 371lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
 372{
 373        unsigned long flags;
 374
 375	spin_lock_irqsave(&card->mask_lock, flags);
 376        card->thread_running_mask &= ~thread;
 377	spin_unlock_irqrestore(&card->mask_lock, flags);
 378        wake_up(&card->wait_q);
 379}
 380
 381static inline int
 382__lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 383{
 384        unsigned long flags;
 385        int rc = 0;
 386
 387	spin_lock_irqsave(&card->mask_lock, flags);
 388        if (card->thread_start_mask & thread){
 389                if ((card->thread_allowed_mask & thread) &&
 390                    !(card->thread_running_mask & thread)){
 391                        rc = 1;
 392                        card->thread_start_mask &= ~thread;
 393                        card->thread_running_mask |= thread;
 394                } else
 395                        rc = -EPERM;
 396        }
 397	spin_unlock_irqrestore(&card->mask_lock, flags);
 398        return rc;
 399}
 400
 401static int
 402lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
 403{
 404        int rc = 0;
 405        wait_event(card->wait_q,
 406                   (rc = __lcs_do_run_thread(card, thread)) >= 0);
 407        return rc;
 408}
 409
 410static int
 411lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
 412{
 413        unsigned long flags;
 414        int rc = 0;
 415
 416	spin_lock_irqsave(&card->mask_lock, flags);
 417        LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
 418                        (u8) card->thread_start_mask,
 419                        (u8) card->thread_allowed_mask,
 420                        (u8) card->thread_running_mask);
 421        rc = (card->thread_start_mask & thread);
 422	spin_unlock_irqrestore(&card->mask_lock, flags);
 423        return rc;
 424}
 425
 426/**
 427 * Initialize channels,card and state machines.
 428 */
 429static void
 430lcs_setup_card(struct lcs_card *card)
 431{
 432	LCS_DBF_TEXT(2, setup, "initcard");
 433	LCS_DBF_HEX(2, setup, &card, sizeof(void*));
 434
 435	lcs_setup_read(card);
 436	lcs_setup_write(card);
 437	/* Set cards initial state. */
 438	card->state = DEV_STATE_DOWN;
 439	card->tx_buffer = NULL;
 440	card->tx_emitted = 0;
 441
 442	init_waitqueue_head(&card->wait_q);
 443	spin_lock_init(&card->lock);
 444	spin_lock_init(&card->ipm_lock);
 445	spin_lock_init(&card->mask_lock);
 446#ifdef CONFIG_IP_MULTICAST
 447	INIT_LIST_HEAD(&card->ipm_list);
 448#endif
 449	INIT_LIST_HEAD(&card->lancmd_waiters);
 450}
 451
 452static inline void
 453lcs_clear_multicast_list(struct lcs_card *card)
 454{
 455#ifdef	CONFIG_IP_MULTICAST
 456	struct lcs_ipm_list *ipm;
 457	unsigned long flags;
 458
 459	/* Free multicast list. */
 460	LCS_DBF_TEXT(3, setup, "clmclist");
 461	spin_lock_irqsave(&card->ipm_lock, flags);
 462	while (!list_empty(&card->ipm_list)){
 463		ipm = list_entry(card->ipm_list.next,
 464				 struct lcs_ipm_list, list);
 465		list_del(&ipm->list);
 466		if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
 467			spin_unlock_irqrestore(&card->ipm_lock, flags);
 468			lcs_send_delipm(card, ipm);
 469			spin_lock_irqsave(&card->ipm_lock, flags);
 470		}
 471		kfree(ipm);
 472	}
 473	spin_unlock_irqrestore(&card->ipm_lock, flags);
 474#endif
 475}
 476/**
 
 477 * Cleanup channels,card and state machines.
 478 */
 479static void
 480lcs_cleanup_card(struct lcs_card *card)
 481{
 482
 483	LCS_DBF_TEXT(3, setup, "cleancrd");
 484	LCS_DBF_HEX(2,setup,&card,sizeof(void*));
 485
 486	if (card->dev != NULL)
 487		free_netdev(card->dev);
 488	/* Cleanup channels. */
 489	lcs_cleanup_channel(&card->write);
 490	lcs_cleanup_channel(&card->read);
 491}
 492
 493/**
 494 * Start channel.
 495 */
 496static int
 497lcs_start_channel(struct lcs_channel *channel)
 498{
 499	unsigned long flags;
 500	int rc;
 501
 502	LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
 503	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 504	rc = ccw_device_start(channel->ccwdev,
 505			      channel->ccws + channel->io_idx, 0, 0,
 506			      DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
 507	if (rc == 0)
 508		channel->state = LCS_CH_STATE_RUNNING;
 509	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 510	if (rc) {
 511		LCS_DBF_TEXT_(4,trace,"essh%s",
 512			      dev_name(&channel->ccwdev->dev));
 513		dev_err(&channel->ccwdev->dev,
 514			"Starting an LCS device resulted in an error,"
 515			" rc=%d!\n", rc);
 516	}
 517	return rc;
 518}
 519
 520static int
 521lcs_clear_channel(struct lcs_channel *channel)
 522{
 523	unsigned long flags;
 524	int rc;
 525
 526	LCS_DBF_TEXT(4,trace,"clearch");
 527	LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
 528	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 529	rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
 530	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 531	if (rc) {
 532		LCS_DBF_TEXT_(4, trace, "ecsc%s",
 533			      dev_name(&channel->ccwdev->dev));
 534		return rc;
 535	}
 536	wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
 537	channel->state = LCS_CH_STATE_STOPPED;
 538	return rc;
 539}
 540
 541
 542/**
 543 * Stop channel.
 544 */
 545static int
 546lcs_stop_channel(struct lcs_channel *channel)
 547{
 548	unsigned long flags;
 549	int rc;
 550
 551	if (channel->state == LCS_CH_STATE_STOPPED)
 552		return 0;
 553	LCS_DBF_TEXT(4,trace,"haltsch");
 554	LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
 555	channel->state = LCS_CH_STATE_INIT;
 556	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 557	rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
 558	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 559	if (rc) {
 560		LCS_DBF_TEXT_(4, trace, "ehsc%s",
 561			      dev_name(&channel->ccwdev->dev));
 562		return rc;
 563	}
 564	/* Asynchronous halt initialted. Wait for its completion. */
 565	wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
 566	lcs_clear_channel(channel);
 567	return 0;
 568}
 569
 570/**
 571 * start read and write channel
 572 */
 573static int
 574lcs_start_channels(struct lcs_card *card)
 575{
 576	int rc;
 577
 578	LCS_DBF_TEXT(2, trace, "chstart");
 579	/* start read channel */
 580	rc = lcs_start_channel(&card->read);
 581	if (rc)
 582		return rc;
 583	/* start write channel */
 584	rc = lcs_start_channel(&card->write);
 585	if (rc)
 586		lcs_stop_channel(&card->read);
 587	return rc;
 588}
 589
 590/**
 591 * stop read and write channel
 592 */
 593static int
 594lcs_stop_channels(struct lcs_card *card)
 595{
 596	LCS_DBF_TEXT(2, trace, "chhalt");
 597	lcs_stop_channel(&card->read);
 598	lcs_stop_channel(&card->write);
 599	return 0;
 600}
 601
 602/**
 603 * Get empty buffer.
 604 */
 605static struct lcs_buffer *
 606__lcs_get_buffer(struct lcs_channel *channel)
 607{
 608	int index;
 609
 610	LCS_DBF_TEXT(5, trace, "_getbuff");
 611	index = channel->io_idx;
 612	do {
 613		if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
 614			channel->iob[index].state = LCS_BUF_STATE_LOCKED;
 615			return channel->iob + index;
 616		}
 617		index = (index + 1) & (LCS_NUM_BUFFS - 1);
 618	} while (index != channel->io_idx);
 619	return NULL;
 620}
 621
 622static struct lcs_buffer *
 623lcs_get_buffer(struct lcs_channel *channel)
 624{
 625	struct lcs_buffer *buffer;
 626	unsigned long flags;
 627
 628	LCS_DBF_TEXT(5, trace, "getbuff");
 629	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 630	buffer = __lcs_get_buffer(channel);
 631	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 632	return buffer;
 633}
 634
 635/**
 636 * Resume channel program if the channel is suspended.
 637 */
 638static int
 639__lcs_resume_channel(struct lcs_channel *channel)
 640{
 641	int rc;
 642
 643	if (channel->state != LCS_CH_STATE_SUSPENDED)
 644		return 0;
 645	if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
 646		return 0;
 647	LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
 648	rc = ccw_device_resume(channel->ccwdev);
 649	if (rc) {
 650		LCS_DBF_TEXT_(4, trace, "ersc%s",
 651			      dev_name(&channel->ccwdev->dev));
 652		dev_err(&channel->ccwdev->dev,
 653			"Sending data from the LCS device to the LAN failed"
 654			" with rc=%d\n",rc);
 655	} else
 656		channel->state = LCS_CH_STATE_RUNNING;
 657	return rc;
 658
 659}
 660
 661/**
 662 * Make a buffer ready for processing.
 663 */
 664static inline void
 665__lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
 666{
 667	int prev, next;
 668
 669	LCS_DBF_TEXT(5, trace, "rdybits");
 670	prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 671	next = (index + 1) & (LCS_NUM_BUFFS - 1);
 672	/* Check if we may clear the suspend bit of this buffer. */
 673	if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
 674		/* Check if we have to set the PCI bit. */
 675		if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
 676			/* Suspend bit of the previous buffer is not set. */
 677			channel->ccws[index].flags |= CCW_FLAG_PCI;
 678		/* Suspend bit of the next buffer is set. */
 679		channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
 680	}
 681}
 682
 683static int
 684lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 685{
 686	unsigned long flags;
 687	int index, rc;
 688
 689	LCS_DBF_TEXT(5, trace, "rdybuff");
 690	BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 691	       buffer->state != LCS_BUF_STATE_PROCESSED);
 692	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 693	buffer->state = LCS_BUF_STATE_READY;
 694	index = buffer - channel->iob;
 695	/* Set length. */
 696	channel->ccws[index].count = buffer->count;
 697	/* Check relevant PCI/suspend bits. */
 698	__lcs_ready_buffer_bits(channel, index);
 699	rc = __lcs_resume_channel(channel);
 700	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 701	return rc;
 702}
 703
 704/**
 705 * Mark the buffer as processed. Take care of the suspend bit
 706 * of the previous buffer. This function is called from
 707 * interrupt context, so the lock must not be taken.
 708 */
 709static int
 710__lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 711{
 712	int index, prev, next;
 713
 714	LCS_DBF_TEXT(5, trace, "prcsbuff");
 715	BUG_ON(buffer->state != LCS_BUF_STATE_READY);
 716	buffer->state = LCS_BUF_STATE_PROCESSED;
 717	index = buffer - channel->iob;
 718	prev = (index - 1) & (LCS_NUM_BUFFS - 1);
 719	next = (index + 1) & (LCS_NUM_BUFFS - 1);
 720	/* Set the suspend bit and clear the PCI bit of this buffer. */
 721	channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
 722	channel->ccws[index].flags &= ~CCW_FLAG_PCI;
 723	/* Check the suspend bit of the previous buffer. */
 724	if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
 725		/*
 726		 * Previous buffer is in state ready. It might have
 727		 * happened in lcs_ready_buffer that the suspend bit
 728		 * has not been cleared to avoid an endless loop.
 729		 * Do it now.
 730		 */
 731		__lcs_ready_buffer_bits(channel, prev);
 732	}
 733	/* Clear PCI bit of next buffer. */
 734	channel->ccws[next].flags &= ~CCW_FLAG_PCI;
 735	return __lcs_resume_channel(channel);
 736}
 737
 738/**
 739 * Put a processed buffer back to state empty.
 740 */
 741static void
 742lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
 743{
 744	unsigned long flags;
 745
 746	LCS_DBF_TEXT(5, trace, "relbuff");
 747	BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
 748	       buffer->state != LCS_BUF_STATE_PROCESSED);
 749	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
 750	buffer->state = LCS_BUF_STATE_EMPTY;
 751	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
 752}
 753
 754/**
 755 * Get buffer for a lan command.
 756 */
 757static struct lcs_buffer *
 758lcs_get_lancmd(struct lcs_card *card, int count)
 759{
 760	struct lcs_buffer *buffer;
 761	struct lcs_cmd *cmd;
 762
 763	LCS_DBF_TEXT(4, trace, "getlncmd");
 764	/* Get buffer and wait if none is available. */
 765	wait_event(card->write.wait_q,
 766		   ((buffer = lcs_get_buffer(&card->write)) != NULL));
 767	count += sizeof(struct lcs_header);
 768	*(__u16 *)(buffer->data + count) = 0;
 769	buffer->count = count + sizeof(__u16);
 770	buffer->callback = lcs_release_buffer;
 771	cmd = (struct lcs_cmd *) buffer->data;
 772	cmd->offset = count;
 773	cmd->type = LCS_FRAME_TYPE_CONTROL;
 774	cmd->slot = 0;
 775	return buffer;
 776}
 777
 778
 779static void
 780lcs_get_reply(struct lcs_reply *reply)
 781{
 782	WARN_ON(atomic_read(&reply->refcnt) <= 0);
 783	atomic_inc(&reply->refcnt);
 784}
 785
 786static void
 787lcs_put_reply(struct lcs_reply *reply)
 788{
 789        WARN_ON(atomic_read(&reply->refcnt) <= 0);
 790        if (atomic_dec_and_test(&reply->refcnt)) {
 791		kfree(reply);
 792	}
 793
 794}
 795
 796static struct lcs_reply *
 797lcs_alloc_reply(struct lcs_cmd *cmd)
 798{
 799	struct lcs_reply *reply;
 800
 801	LCS_DBF_TEXT(4, trace, "getreply");
 802
 803	reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
 804	if (!reply)
 805		return NULL;
 806	atomic_set(&reply->refcnt,1);
 807	reply->sequence_no = cmd->sequence_no;
 808	reply->received = 0;
 809	reply->rc = 0;
 810	init_waitqueue_head(&reply->wait_q);
 811
 812	return reply;
 813}
 814
 815/**
 816 * Notifier function for lancmd replies. Called from read irq.
 817 */
 818static void
 819lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
 820{
 821	struct list_head *l, *n;
 822	struct lcs_reply *reply;
 823
 824	LCS_DBF_TEXT(4, trace, "notiwait");
 825	spin_lock(&card->lock);
 826	list_for_each_safe(l, n, &card->lancmd_waiters) {
 827		reply = list_entry(l, struct lcs_reply, list);
 828		if (reply->sequence_no == cmd->sequence_no) {
 829			lcs_get_reply(reply);
 830			list_del_init(&reply->list);
 831			if (reply->callback != NULL)
 832				reply->callback(card, cmd);
 833			reply->received = 1;
 834			reply->rc = cmd->return_code;
 835			wake_up(&reply->wait_q);
 836			lcs_put_reply(reply);
 837			break;
 838		}
 839	}
 840	spin_unlock(&card->lock);
 841}
 842
 843/**
 844 * Emit buffer of a lan command.
 845 */
 846static void
 847lcs_lancmd_timeout(unsigned long data)
 848{
 849	struct lcs_reply *reply, *list_reply, *r;
 
 850	unsigned long flags;
 851
 852	LCS_DBF_TEXT(4, trace, "timeout");
 853	reply = (struct lcs_reply *) data;
 854	spin_lock_irqsave(&reply->card->lock, flags);
 855	list_for_each_entry_safe(list_reply, r,
 856				 &reply->card->lancmd_waiters,list) {
 857		if (reply == list_reply) {
 858			lcs_get_reply(reply);
 859			list_del_init(&reply->list);
 860			spin_unlock_irqrestore(&reply->card->lock, flags);
 861			reply->received = 1;
 862			reply->rc = -ETIME;
 863			wake_up(&reply->wait_q);
 864			lcs_put_reply(reply);
 865			return;
 866		}
 867	}
 868	spin_unlock_irqrestore(&reply->card->lock, flags);
 869}
 870
 871static int
 872lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
 873		void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
 874{
 875	struct lcs_reply *reply;
 876	struct lcs_cmd *cmd;
 877	struct timer_list timer;
 878	unsigned long flags;
 879	int rc;
 880
 881	LCS_DBF_TEXT(4, trace, "sendcmd");
 882	cmd = (struct lcs_cmd *) buffer->data;
 883	cmd->return_code = 0;
 884	cmd->sequence_no = card->sequence_no++;
 885	reply = lcs_alloc_reply(cmd);
 886	if (!reply)
 887		return -ENOMEM;
 888	reply->callback = reply_callback;
 889	reply->card = card;
 890	spin_lock_irqsave(&card->lock, flags);
 891	list_add_tail(&reply->list, &card->lancmd_waiters);
 892	spin_unlock_irqrestore(&card->lock, flags);
 893
 894	buffer->callback = lcs_release_buffer;
 895	rc = lcs_ready_buffer(&card->write, buffer);
 896	if (rc)
 897		return rc;
 898	init_timer_on_stack(&timer);
 899	timer.function = lcs_lancmd_timeout;
 900	timer.data = (unsigned long) reply;
 901	timer.expires = jiffies + HZ*card->lancmd_timeout;
 902	add_timer(&timer);
 903	wait_event(reply->wait_q, reply->received);
 904	del_timer_sync(&timer);
 905	LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
 906	rc = reply->rc;
 907	lcs_put_reply(reply);
 908	return rc ? -EIO : 0;
 909}
 910
 911/**
 912 * LCS startup command
 913 */
 914static int
 915lcs_send_startup(struct lcs_card *card, __u8 initiator)
 916{
 917	struct lcs_buffer *buffer;
 918	struct lcs_cmd *cmd;
 919
 920	LCS_DBF_TEXT(2, trace, "startup");
 921	buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 922	cmd = (struct lcs_cmd *) buffer->data;
 923	cmd->cmd_code = LCS_CMD_STARTUP;
 924	cmd->initiator = initiator;
 925	cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
 926	return lcs_send_lancmd(card, buffer, NULL);
 927}
 928
 929/**
 930 * LCS shutdown command
 931 */
 932static int
 933lcs_send_shutdown(struct lcs_card *card)
 934{
 935	struct lcs_buffer *buffer;
 936	struct lcs_cmd *cmd;
 937
 938	LCS_DBF_TEXT(2, trace, "shutdown");
 939	buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 940	cmd = (struct lcs_cmd *) buffer->data;
 941	cmd->cmd_code = LCS_CMD_SHUTDOWN;
 942	cmd->initiator = LCS_INITIATOR_TCPIP;
 943	return lcs_send_lancmd(card, buffer, NULL);
 944}
 945
 946/**
 947 * LCS lanstat command
 948 */
 949static void
 950__lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 951{
 952	LCS_DBF_TEXT(2, trace, "statcb");
 953	memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
 954}
 955
 956static int
 957lcs_send_lanstat(struct lcs_card *card)
 958{
 959	struct lcs_buffer *buffer;
 960	struct lcs_cmd *cmd;
 961
 962	LCS_DBF_TEXT(2,trace, "cmdstat");
 963	buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 964	cmd = (struct lcs_cmd *) buffer->data;
 965	/* Setup lanstat command. */
 966	cmd->cmd_code = LCS_CMD_LANSTAT;
 967	cmd->initiator = LCS_INITIATOR_TCPIP;
 968	cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 969	cmd->cmd.lcs_std_cmd.portno = card->portno;
 970	return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
 971}
 972
 973/**
 974 * send stoplan command
 975 */
 976static int
 977lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
 978{
 979	struct lcs_buffer *buffer;
 980	struct lcs_cmd *cmd;
 981
 982	LCS_DBF_TEXT(2, trace, "cmdstpln");
 983	buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
 984	cmd = (struct lcs_cmd *) buffer->data;
 985	cmd->cmd_code = LCS_CMD_STOPLAN;
 986	cmd->initiator = initiator;
 987	cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
 988	cmd->cmd.lcs_std_cmd.portno = card->portno;
 989	return lcs_send_lancmd(card, buffer, NULL);
 990}
 991
 992/**
 993 * send startlan command
 994 */
 995static void
 996__lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
 997{
 998	LCS_DBF_TEXT(2, trace, "srtlancb");
 999	card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
1000	card->portno = cmd->cmd.lcs_std_cmd.portno;
1001}
1002
1003static int
1004lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1005{
1006	struct lcs_buffer *buffer;
1007	struct lcs_cmd *cmd;
1008
1009	LCS_DBF_TEXT(2, trace, "cmdstaln");
1010	buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1011	cmd = (struct lcs_cmd *) buffer->data;
1012	cmd->cmd_code = LCS_CMD_STARTLAN;
1013	cmd->initiator = initiator;
1014	cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1015	cmd->cmd.lcs_std_cmd.portno = card->portno;
1016	return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1017}
1018
1019#ifdef CONFIG_IP_MULTICAST
1020/**
1021 * send setipm command (Multicast)
1022 */
1023static int
1024lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1025{
1026	struct lcs_buffer *buffer;
1027	struct lcs_cmd *cmd;
1028
1029	LCS_DBF_TEXT(2, trace, "cmdsetim");
1030	buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1031	cmd = (struct lcs_cmd *) buffer->data;
1032	cmd->cmd_code = LCS_CMD_SETIPM;
1033	cmd->initiator = LCS_INITIATOR_TCPIP;
1034	cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1035	cmd->cmd.lcs_qipassist.portno = card->portno;
1036	cmd->cmd.lcs_qipassist.version = 4;
1037	cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1038	memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1039	       &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1040	LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1041	return lcs_send_lancmd(card, buffer, NULL);
1042}
1043
1044/**
1045 * send delipm command (Multicast)
1046 */
1047static int
1048lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1049{
1050	struct lcs_buffer *buffer;
1051	struct lcs_cmd *cmd;
1052
1053	LCS_DBF_TEXT(2, trace, "cmddelim");
1054	buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1055	cmd = (struct lcs_cmd *) buffer->data;
1056	cmd->cmd_code = LCS_CMD_DELIPM;
1057	cmd->initiator = LCS_INITIATOR_TCPIP;
1058	cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1059	cmd->cmd.lcs_qipassist.portno = card->portno;
1060	cmd->cmd.lcs_qipassist.version = 4;
1061	cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1062	memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1063	       &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1064	LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1065	return lcs_send_lancmd(card, buffer, NULL);
1066}
1067
1068/**
1069 * check if multicast is supported by LCS
1070 */
1071static void
1072__lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1073{
1074	LCS_DBF_TEXT(2, trace, "chkmccb");
1075	card->ip_assists_supported =
1076		cmd->cmd.lcs_qipassist.ip_assists_supported;
1077	card->ip_assists_enabled =
1078		cmd->cmd.lcs_qipassist.ip_assists_enabled;
1079}
1080
1081static int
1082lcs_check_multicast_support(struct lcs_card *card)
1083{
1084	struct lcs_buffer *buffer;
1085	struct lcs_cmd *cmd;
1086	int rc;
1087
1088	LCS_DBF_TEXT(2, trace, "cmdqipa");
1089	/* Send query ipassist. */
1090	buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1091	cmd = (struct lcs_cmd *) buffer->data;
1092	cmd->cmd_code = LCS_CMD_QIPASSIST;
1093	cmd->initiator = LCS_INITIATOR_TCPIP;
1094	cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1095	cmd->cmd.lcs_qipassist.portno = card->portno;
1096	cmd->cmd.lcs_qipassist.version = 4;
1097	cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1098	rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1099	if (rc != 0) {
1100		pr_err("Query IPAssist failed. Assuming unsupported!\n");
1101		return -EOPNOTSUPP;
1102	}
1103	if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1104		return 0;
1105	return -EOPNOTSUPP;
1106}
1107
1108/**
1109 * set or del multicast address on LCS card
1110 */
1111static void
1112lcs_fix_multicast_list(struct lcs_card *card)
1113{
1114	struct list_head failed_list;
1115	struct lcs_ipm_list *ipm, *tmp;
1116	unsigned long flags;
1117	int rc;
1118
1119	LCS_DBF_TEXT(4,trace, "fixipm");
1120	INIT_LIST_HEAD(&failed_list);
1121	spin_lock_irqsave(&card->ipm_lock, flags);
1122list_modified:
1123	list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1124		switch (ipm->ipm_state) {
1125		case LCS_IPM_STATE_SET_REQUIRED:
1126			/* del from ipm_list so no one else can tamper with
1127			 * this entry */
1128			list_del_init(&ipm->list);
1129			spin_unlock_irqrestore(&card->ipm_lock, flags);
1130			rc = lcs_send_setipm(card, ipm);
1131			spin_lock_irqsave(&card->ipm_lock, flags);
1132			if (rc) {
1133				pr_info("Adding multicast address failed."
1134					" Table possibly full!\n");
1135				/* store ipm in failed list -> will be added
1136				 * to ipm_list again, so a retry will be done
1137				 * during the next call of this function */
1138				list_add_tail(&ipm->list, &failed_list);
1139			} else {
1140				ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1141				/* re-insert into ipm_list */
1142				list_add_tail(&ipm->list, &card->ipm_list);
1143			}
1144			goto list_modified;
1145		case LCS_IPM_STATE_DEL_REQUIRED:
1146			list_del(&ipm->list);
1147			spin_unlock_irqrestore(&card->ipm_lock, flags);
1148			lcs_send_delipm(card, ipm);
1149			spin_lock_irqsave(&card->ipm_lock, flags);
1150			kfree(ipm);
1151			goto list_modified;
1152		case LCS_IPM_STATE_ON_CARD:
1153			break;
1154		}
1155	}
1156	/* re-insert all entries from the failed_list into ipm_list */
1157	list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1158		list_move_tail(&ipm->list, &card->ipm_list);
1159
1160	spin_unlock_irqrestore(&card->ipm_lock, flags);
1161}
1162
1163/**
1164 * get mac address for the relevant Multicast address
1165 */
1166static void
1167lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1168{
1169	LCS_DBF_TEXT(4,trace, "getmac");
1170	if (dev->type == ARPHRD_IEEE802_TR)
1171		ip_tr_mc_map(ipm, mac);
1172	else
1173		ip_eth_mc_map(ipm, mac);
1174}
1175
1176/**
1177 * function called by net device to handle multicast address relevant things
1178 */
1179static inline void
1180lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1181{
1182	struct ip_mc_list *im4;
1183	struct list_head *l;
1184	struct lcs_ipm_list *ipm;
1185	unsigned long flags;
1186	char buf[MAX_ADDR_LEN];
1187
1188	LCS_DBF_TEXT(4, trace, "remmclst");
1189	spin_lock_irqsave(&card->ipm_lock, flags);
1190	list_for_each(l, &card->ipm_list) {
1191		ipm = list_entry(l, struct lcs_ipm_list, list);
1192		for (im4 = rcu_dereference(in4_dev->mc_list);
1193		     im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1194			lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1195			if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1196			     (memcmp(buf, &ipm->ipm.mac_addr,
1197				     LCS_MAC_LENGTH) == 0) )
1198				break;
1199		}
1200		if (im4 == NULL)
1201			ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1202	}
1203	spin_unlock_irqrestore(&card->ipm_lock, flags);
1204}
1205
1206static inline struct lcs_ipm_list *
1207lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
 
1208{
1209	struct lcs_ipm_list *tmp, *ipm = NULL;
1210	struct list_head *l;
1211	unsigned long flags;
1212
1213	LCS_DBF_TEXT(4, trace, "chkmcent");
1214	spin_lock_irqsave(&card->ipm_lock, flags);
1215	list_for_each(l, &card->ipm_list) {
1216		tmp = list_entry(l, struct lcs_ipm_list, list);
1217		if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1218		     (memcmp(buf, &tmp->ipm.mac_addr,
1219			     LCS_MAC_LENGTH) == 0) ) {
1220			ipm = tmp;
1221			break;
1222		}
1223	}
1224	spin_unlock_irqrestore(&card->ipm_lock, flags);
1225	return ipm;
1226}
1227
1228static inline void
1229lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1230{
1231
1232	struct ip_mc_list *im4;
1233	struct lcs_ipm_list *ipm;
1234	char buf[MAX_ADDR_LEN];
1235	unsigned long flags;
1236
1237	LCS_DBF_TEXT(4, trace, "setmclst");
1238	for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1239	     im4 = rcu_dereference(im4->next_rcu)) {
1240		lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1241		ipm = lcs_check_addr_entry(card, im4, buf);
1242		if (ipm != NULL)
1243			continue;	/* Address already in list. */
1244		ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1245		if (ipm == NULL) {
1246			pr_info("Not enough memory to add"
1247				" new multicast entry!\n");
1248			break;
1249		}
1250		memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1251		ipm->ipm.ip_addr = im4->multiaddr;
1252		ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1253		spin_lock_irqsave(&card->ipm_lock, flags);
1254		LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1255		list_add(&ipm->list, &card->ipm_list);
1256		spin_unlock_irqrestore(&card->ipm_lock, flags);
1257	}
1258}
1259
1260static int
1261lcs_register_mc_addresses(void *data)
1262{
1263	struct lcs_card *card;
1264	struct in_device *in4_dev;
1265
1266	card = (struct lcs_card *) data;
1267
1268	if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1269		return 0;
1270	LCS_DBF_TEXT(4, trace, "regmulti");
1271
1272	in4_dev = in_dev_get(card->dev);
1273	if (in4_dev == NULL)
1274		goto out;
1275	rcu_read_lock();
1276	lcs_remove_mc_addresses(card,in4_dev);
1277	lcs_set_mc_addresses(card, in4_dev);
1278	rcu_read_unlock();
1279	in_dev_put(in4_dev);
1280
1281	netif_carrier_off(card->dev);
1282	netif_tx_disable(card->dev);
1283	wait_event(card->write.wait_q,
1284			(card->write.state != LCS_CH_STATE_RUNNING));
1285	lcs_fix_multicast_list(card);
1286	if (card->state == DEV_STATE_UP) {
1287		netif_carrier_on(card->dev);
1288		netif_wake_queue(card->dev);
1289	}
1290out:
1291	lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1292	return 0;
1293}
1294#endif /* CONFIG_IP_MULTICAST */
1295
1296/**
1297 * function called by net device to
1298 * handle multicast address relevant things
1299 */
1300static void
1301lcs_set_multicast_list(struct net_device *dev)
1302{
1303#ifdef CONFIG_IP_MULTICAST
1304        struct lcs_card *card;
1305
1306        LCS_DBF_TEXT(4, trace, "setmulti");
1307        card = (struct lcs_card *) dev->ml_priv;
1308
1309        if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1310		schedule_work(&card->kernel_thread_starter);
1311#endif /* CONFIG_IP_MULTICAST */
1312}
1313
1314static long
1315lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1316{
1317	if (!IS_ERR(irb))
1318		return 0;
1319
1320	switch (PTR_ERR(irb)) {
1321	case -EIO:
1322		dev_warn(&cdev->dev,
1323			"An I/O-error occurred on the LCS device\n");
1324		LCS_DBF_TEXT(2, trace, "ckirberr");
1325		LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1326		break;
1327	case -ETIMEDOUT:
1328		dev_warn(&cdev->dev,
1329			"A command timed out on the LCS device\n");
1330		LCS_DBF_TEXT(2, trace, "ckirberr");
1331		LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1332		break;
1333	default:
1334		dev_warn(&cdev->dev,
1335			"An error occurred on the LCS device, rc=%ld\n",
1336			PTR_ERR(irb));
1337		LCS_DBF_TEXT(2, trace, "ckirberr");
1338		LCS_DBF_TEXT(2, trace, "  rc???");
1339	}
1340	return PTR_ERR(irb);
1341}
1342
1343static int
1344lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1345{
1346	int dstat, cstat;
1347	char *sense;
1348
1349	sense = (char *) irb->ecw;
1350	cstat = irb->scsw.cmd.cstat;
1351	dstat = irb->scsw.cmd.dstat;
1352
1353	if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1354		     SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1355		     SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
1356		LCS_DBF_TEXT(2, trace, "CGENCHK");
1357		return 1;
1358	}
1359	if (dstat & DEV_STAT_UNIT_CHECK) {
1360		if (sense[LCS_SENSE_BYTE_1] &
1361		    LCS_SENSE_RESETTING_EVENT) {
1362			LCS_DBF_TEXT(2, trace, "REVIND");
1363			return 1;
1364		}
1365		if (sense[LCS_SENSE_BYTE_0] &
1366		    LCS_SENSE_CMD_REJECT) {
1367			LCS_DBF_TEXT(2, trace, "CMDREJ");
1368			return 0;
1369		}
1370		if ((!sense[LCS_SENSE_BYTE_0]) &&
1371		    (!sense[LCS_SENSE_BYTE_1]) &&
1372		    (!sense[LCS_SENSE_BYTE_2]) &&
1373		    (!sense[LCS_SENSE_BYTE_3])) {
1374			LCS_DBF_TEXT(2, trace, "ZEROSEN");
1375			return 0;
1376		}
1377		LCS_DBF_TEXT(2, trace, "DGENCHK");
1378		return 1;
1379	}
1380	return 0;
1381}
1382
1383static void
1384lcs_schedule_recovery(struct lcs_card *card)
1385{
1386	LCS_DBF_TEXT(2, trace, "startrec");
1387	if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1388		schedule_work(&card->kernel_thread_starter);
1389}
1390
1391/**
1392 * IRQ Handler for LCS channels
1393 */
1394static void
1395lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1396{
1397	struct lcs_card *card;
1398	struct lcs_channel *channel;
1399	int rc, index;
1400	int cstat, dstat;
1401
1402	kstat_cpu(smp_processor_id()).irqs[IOINT_LCS]++;
1403	if (lcs_check_irb_error(cdev, irb))
1404		return;
1405
1406	card = CARD_FROM_DEV(cdev);
1407	if (card->read.ccwdev == cdev)
1408		channel = &card->read;
1409	else
1410		channel = &card->write;
1411
1412	cstat = irb->scsw.cmd.cstat;
1413	dstat = irb->scsw.cmd.dstat;
1414	LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1415	LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1416		      irb->scsw.cmd.dstat);
1417	LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1418		      irb->scsw.cmd.actl);
1419
1420	/* Check for channel and device errors presented */
1421	rc = lcs_get_problem(cdev, irb);
1422	if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1423		dev_warn(&cdev->dev,
1424			"The LCS device stopped because of an error,"
1425			" dstat=0x%X, cstat=0x%X \n",
1426			    dstat, cstat);
1427		if (rc) {
1428			channel->state = LCS_CH_STATE_ERROR;
1429		}
1430	}
1431	if (channel->state == LCS_CH_STATE_ERROR) {
1432		lcs_schedule_recovery(card);
1433		wake_up(&card->wait_q);
1434		return;
1435	}
1436	/* How far in the ccw chain have we processed? */
1437	if ((channel->state != LCS_CH_STATE_INIT) &&
1438	    (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1439	    (irb->scsw.cmd.cpa != 0)) {
1440		index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1441			- channel->ccws;
1442		if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1443		    (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1444			/* Bloody io subsystem tells us lies about cpa... */
1445			index = (index - 1) & (LCS_NUM_BUFFS - 1);
1446		while (channel->io_idx != index) {
1447			__lcs_processed_buffer(channel,
1448					       channel->iob + channel->io_idx);
1449			channel->io_idx =
1450				(channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1451		}
1452	}
1453
1454	if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1455	    (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1456	    (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1457		/* Mark channel as stopped. */
1458		channel->state = LCS_CH_STATE_STOPPED;
1459	else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1460		/* CCW execution stopped on a suspend bit. */
1461		channel->state = LCS_CH_STATE_SUSPENDED;
1462	if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1463		if (irb->scsw.cmd.cc != 0) {
1464			ccw_device_halt(channel->ccwdev, (addr_t) channel);
1465			return;
1466		}
1467		/* The channel has been stopped by halt_IO. */
1468		channel->state = LCS_CH_STATE_HALTED;
1469	}
1470	if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1471		channel->state = LCS_CH_STATE_CLEARED;
1472	/* Do the rest in the tasklet. */
1473	tasklet_schedule(&channel->irq_tasklet);
1474}
1475
1476/**
1477 * Tasklet for IRQ handler
1478 */
1479static void
1480lcs_tasklet(unsigned long data)
1481{
1482	unsigned long flags;
1483	struct lcs_channel *channel;
1484	struct lcs_buffer *iob;
1485	int buf_idx;
1486
1487	channel = (struct lcs_channel *) data;
1488	LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1489
1490	/* Check for processed buffers. */
1491	iob = channel->iob;
1492	buf_idx = channel->buf_idx;
1493	while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1494		/* Do the callback thing. */
1495		if (iob[buf_idx].callback != NULL)
1496			iob[buf_idx].callback(channel, iob + buf_idx);
1497		buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1498	}
1499	channel->buf_idx = buf_idx;
1500
1501	if (channel->state == LCS_CH_STATE_STOPPED)
1502		lcs_start_channel(channel);
1503	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1504	if (channel->state == LCS_CH_STATE_SUSPENDED &&
1505	    channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1506		__lcs_resume_channel(channel);
1507	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1508
1509	/* Something happened on the channel. Wake up waiters. */
1510	wake_up(&channel->wait_q);
1511}
1512
1513/**
1514 * Finish current tx buffer and make it ready for transmit.
1515 */
1516static void
1517__lcs_emit_txbuffer(struct lcs_card *card)
1518{
1519	LCS_DBF_TEXT(5, trace, "emittx");
1520	*(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1521	card->tx_buffer->count += 2;
1522	lcs_ready_buffer(&card->write, card->tx_buffer);
1523	card->tx_buffer = NULL;
1524	card->tx_emitted++;
1525}
1526
1527/**
1528 * Callback for finished tx buffers.
1529 */
1530static void
1531lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1532{
1533	struct lcs_card *card;
1534
1535	LCS_DBF_TEXT(5, trace, "txbuffcb");
1536	/* Put buffer back to pool. */
1537	lcs_release_buffer(channel, buffer);
1538	card = container_of(channel, struct lcs_card, write);
1539	if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1540		netif_wake_queue(card->dev);
1541	spin_lock(&card->lock);
1542	card->tx_emitted--;
1543	if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1544		/*
1545		 * Last running tx buffer has finished. Submit partially
1546		 * filled current buffer.
1547		 */
1548		__lcs_emit_txbuffer(card);
1549	spin_unlock(&card->lock);
1550}
1551
1552/**
1553 * Packet transmit function called by network stack
1554 */
1555static int
1556__lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1557		 struct net_device *dev)
1558{
1559	struct lcs_header *header;
1560	int rc = NETDEV_TX_OK;
1561
1562	LCS_DBF_TEXT(5, trace, "hardxmit");
1563	if (skb == NULL) {
1564		card->stats.tx_dropped++;
1565		card->stats.tx_errors++;
1566		return NETDEV_TX_OK;
1567	}
1568	if (card->state != DEV_STATE_UP) {
1569		dev_kfree_skb(skb);
1570		card->stats.tx_dropped++;
1571		card->stats.tx_errors++;
1572		card->stats.tx_carrier_errors++;
1573		return NETDEV_TX_OK;
1574	}
1575	if (skb->protocol == htons(ETH_P_IPV6)) {
1576		dev_kfree_skb(skb);
1577		return NETDEV_TX_OK;
1578	}
1579	netif_stop_queue(card->dev);
1580	spin_lock(&card->lock);
1581	if (card->tx_buffer != NULL &&
1582	    card->tx_buffer->count + sizeof(struct lcs_header) +
1583	    skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1584		/* skb too big for current tx buffer. */
1585		__lcs_emit_txbuffer(card);
1586	if (card->tx_buffer == NULL) {
1587		/* Get new tx buffer */
1588		card->tx_buffer = lcs_get_buffer(&card->write);
1589		if (card->tx_buffer == NULL) {
1590			card->stats.tx_dropped++;
1591			rc = NETDEV_TX_BUSY;
1592			goto out;
1593		}
1594		card->tx_buffer->callback = lcs_txbuffer_cb;
1595		card->tx_buffer->count = 0;
1596	}
1597	header = (struct lcs_header *)
1598		(card->tx_buffer->data + card->tx_buffer->count);
1599	card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1600	header->offset = card->tx_buffer->count;
1601	header->type = card->lan_type;
1602	header->slot = card->portno;
1603	skb_copy_from_linear_data(skb, header + 1, skb->len);
1604	spin_unlock(&card->lock);
1605	card->stats.tx_bytes += skb->len;
1606	card->stats.tx_packets++;
1607	dev_kfree_skb(skb);
1608	netif_wake_queue(card->dev);
1609	spin_lock(&card->lock);
1610	if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1611		/* If this is the first tx buffer emit it immediately. */
1612		__lcs_emit_txbuffer(card);
1613out:
1614	spin_unlock(&card->lock);
1615	return rc;
1616}
1617
1618static int
1619lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1620{
1621	struct lcs_card *card;
1622	int rc;
1623
1624	LCS_DBF_TEXT(5, trace, "pktxmit");
1625	card = (struct lcs_card *) dev->ml_priv;
1626	rc = __lcs_start_xmit(card, skb, dev);
1627	return rc;
1628}
1629
1630/**
1631 * send startlan and lanstat command to make LCS device ready
1632 */
1633static int
1634lcs_startlan_auto(struct lcs_card *card)
1635{
1636	int rc;
1637
1638	LCS_DBF_TEXT(2, trace, "strtauto");
1639#ifdef CONFIG_NET_ETHERNET
1640	card->lan_type = LCS_FRAME_TYPE_ENET;
1641	rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1642	if (rc == 0)
1643		return 0;
1644
1645#endif
1646#ifdef CONFIG_TR
1647	card->lan_type = LCS_FRAME_TYPE_TR;
1648	rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1649	if (rc == 0)
1650		return 0;
1651#endif
1652#ifdef CONFIG_FDDI
1653	card->lan_type = LCS_FRAME_TYPE_FDDI;
1654	rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1655	if (rc == 0)
1656		return 0;
1657#endif
1658	return -EIO;
1659}
1660
1661static int
1662lcs_startlan(struct lcs_card *card)
1663{
1664	int rc, i;
1665
1666	LCS_DBF_TEXT(2, trace, "startlan");
1667	rc = 0;
1668	if (card->portno != LCS_INVALID_PORT_NO) {
1669		if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1670			rc = lcs_startlan_auto(card);
1671		else
1672			rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1673	} else {
1674                for (i = 0; i <= 16; i++) {
1675                        card->portno = i;
1676                        if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1677                                rc = lcs_send_startlan(card,
1678                                                       LCS_INITIATOR_TCPIP);
1679                        else
1680                                /* autodetecting lan type */
1681                                rc = lcs_startlan_auto(card);
1682                        if (rc == 0)
1683                                break;
1684                }
1685        }
1686	if (rc == 0)
1687		return lcs_send_lanstat(card);
1688	return rc;
1689}
1690
1691/**
1692 * LCS detect function
1693 * setup channels and make them I/O ready
1694 */
1695static int
1696lcs_detect(struct lcs_card *card)
1697{
1698	int rc = 0;
1699
1700	LCS_DBF_TEXT(2, setup, "lcsdetct");
1701	/* start/reset card */
1702	if (card->dev)
1703		netif_stop_queue(card->dev);
1704	rc = lcs_stop_channels(card);
1705	if (rc == 0) {
1706		rc = lcs_start_channels(card);
1707		if (rc == 0) {
1708			rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1709			if (rc == 0)
1710				rc = lcs_startlan(card);
1711		}
1712	}
1713	if (rc == 0) {
1714		card->state = DEV_STATE_UP;
1715	} else {
1716		card->state = DEV_STATE_DOWN;
1717		card->write.state = LCS_CH_STATE_INIT;
1718		card->read.state =  LCS_CH_STATE_INIT;
1719	}
1720	return rc;
1721}
1722
1723/**
1724 * LCS Stop card
1725 */
1726static int
1727lcs_stopcard(struct lcs_card *card)
1728{
1729	int rc;
1730
1731	LCS_DBF_TEXT(3, setup, "stopcard");
1732
1733	if (card->read.state != LCS_CH_STATE_STOPPED &&
1734	    card->write.state != LCS_CH_STATE_STOPPED &&
1735	    card->read.state != LCS_CH_STATE_ERROR &&
1736	    card->write.state != LCS_CH_STATE_ERROR &&
1737	    card->state == DEV_STATE_UP) {
1738		lcs_clear_multicast_list(card);
1739		rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1740		rc = lcs_send_shutdown(card);
1741	}
1742	rc = lcs_stop_channels(card);
1743	card->state = DEV_STATE_DOWN;
1744
1745	return rc;
1746}
1747
1748/**
1749 * Kernel Thread helper functions for LGW initiated commands
1750 */
1751static void
1752lcs_start_kernel_thread(struct work_struct *work)
1753{
1754	struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1755	LCS_DBF_TEXT(5, trace, "krnthrd");
1756	if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1757		kthread_run(lcs_recovery, card, "lcs_recover");
1758#ifdef CONFIG_IP_MULTICAST
1759	if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1760		kthread_run(lcs_register_mc_addresses, card, "regipm");
1761#endif
1762}
1763
1764/**
1765 * Process control frames.
1766 */
1767static void
1768lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1769{
1770	LCS_DBF_TEXT(5, trace, "getctrl");
1771	if (cmd->initiator == LCS_INITIATOR_LGW) {
1772		switch(cmd->cmd_code) {
1773		case LCS_CMD_STARTUP:
1774		case LCS_CMD_STARTLAN:
1775			lcs_schedule_recovery(card);
1776			break;
1777		case LCS_CMD_STOPLAN:
1778			pr_warning("Stoplan for %s initiated by LGW.\n",
1779				   card->dev->name);
1780			if (card->dev)
1781				netif_carrier_off(card->dev);
 
1782			break;
1783		default:
1784			LCS_DBF_TEXT(5, trace, "noLGWcmd");
1785			break;
1786		}
1787	} else
1788		lcs_notify_lancmd_waiters(card, cmd);
1789}
1790
1791/**
1792 * Unpack network packet.
1793 */
1794static void
1795lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1796{
1797	struct sk_buff *skb;
1798
1799	LCS_DBF_TEXT(5, trace, "getskb");
1800	if (card->dev == NULL ||
1801	    card->state != DEV_STATE_UP)
1802		/* The card isn't up. Ignore the packet. */
1803		return;
1804
1805	skb = dev_alloc_skb(skb_len);
1806	if (skb == NULL) {
1807		dev_err(&card->dev->dev,
1808			" Allocating a socket buffer to interface %s failed\n",
1809			  card->dev->name);
1810		card->stats.rx_dropped++;
1811		return;
1812	}
1813	memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1814	skb->protocol =	card->lan_type_trans(skb, card->dev);
1815	card->stats.rx_bytes += skb_len;
1816	card->stats.rx_packets++;
1817	if (skb->protocol == htons(ETH_P_802_2))
1818		*((__u32 *)skb->cb) = ++card->pkt_seq;
1819	netif_rx(skb);
1820}
1821
1822/**
1823 * LCS main routine to get packets and lancmd replies from the buffers
1824 */
1825static void
1826lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1827{
1828	struct lcs_card *card;
1829	struct lcs_header *lcs_hdr;
1830	__u16 offset;
1831
1832	LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1833	lcs_hdr = (struct lcs_header *) buffer->data;
1834	if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1835		LCS_DBF_TEXT(4, trace, "-eiogpkt");
1836		return;
1837	}
1838	card = container_of(channel, struct lcs_card, read);
1839	offset = 0;
1840	while (lcs_hdr->offset != 0) {
1841		if (lcs_hdr->offset <= 0 ||
1842		    lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1843		    lcs_hdr->offset < offset) {
1844			/* Offset invalid. */
1845			card->stats.rx_length_errors++;
1846			card->stats.rx_errors++;
1847			return;
1848		}
1849		/* What kind of frame is it? */
1850		if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1851			/* Control frame. */
1852			lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1853		else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1854			 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1855			 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1856			/* Normal network packet. */
1857			lcs_get_skb(card, (char *)(lcs_hdr + 1),
1858				    lcs_hdr->offset - offset -
1859				    sizeof(struct lcs_header));
1860		else
1861			/* Unknown frame type. */
1862			; // FIXME: error message ?
 
1863		/* Proceed to next frame. */
1864		offset = lcs_hdr->offset;
1865		lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1866		lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1867	}
1868	/* The buffer is now empty. Make it ready again. */
1869	lcs_ready_buffer(&card->read, buffer);
1870}
1871
1872/**
1873 * get network statistics for ifconfig and other user programs
1874 */
1875static struct net_device_stats *
1876lcs_getstats(struct net_device *dev)
1877{
1878	struct lcs_card *card;
1879
1880	LCS_DBF_TEXT(4, trace, "netstats");
1881	card = (struct lcs_card *) dev->ml_priv;
1882	return &card->stats;
1883}
1884
1885/**
1886 * stop lcs device
1887 * This function will be called by user doing ifconfig xxx down
1888 */
1889static int
1890lcs_stop_device(struct net_device *dev)
1891{
1892	struct lcs_card *card;
1893	int rc;
1894
1895	LCS_DBF_TEXT(2, trace, "stopdev");
1896	card   = (struct lcs_card *) dev->ml_priv;
1897	netif_carrier_off(dev);
1898	netif_tx_disable(dev);
1899	dev->flags &= ~IFF_UP;
1900	wait_event(card->write.wait_q,
1901		(card->write.state != LCS_CH_STATE_RUNNING));
1902	rc = lcs_stopcard(card);
1903	if (rc)
1904		dev_err(&card->dev->dev,
1905			" Shutting down the LCS device failed\n ");
1906	return rc;
1907}
1908
1909/**
1910 * start lcs device and make it runnable
1911 * This function will be called by user doing ifconfig xxx up
1912 */
1913static int
1914lcs_open_device(struct net_device *dev)
1915{
1916	struct lcs_card *card;
1917	int rc;
1918
1919	LCS_DBF_TEXT(2, trace, "opendev");
1920	card = (struct lcs_card *) dev->ml_priv;
1921	/* initialize statistics */
1922	rc = lcs_detect(card);
1923	if (rc) {
1924		pr_err("Error in opening device!\n");
1925
1926	} else {
1927		dev->flags |= IFF_UP;
1928		netif_carrier_on(dev);
1929		netif_wake_queue(dev);
1930		card->state = DEV_STATE_UP;
1931	}
1932	return rc;
1933}
1934
1935/**
1936 * show function for portno called by cat or similar things
1937 */
1938static ssize_t
1939lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1940{
1941        struct lcs_card *card;
1942
1943	card = dev_get_drvdata(dev);
1944
1945        if (!card)
1946                return 0;
1947
1948        return sprintf(buf, "%d\n", card->portno);
1949}
1950
1951/**
1952 * store the value which is piped to file portno
1953 */
1954static ssize_t
1955lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1956{
1957        struct lcs_card *card;
1958        int value;
 
1959
1960	card = dev_get_drvdata(dev);
1961
1962        if (!card)
1963                return 0;
1964
1965        sscanf(buf, "%u", &value);
 
 
1966        /* TODO: sanity checks */
1967        card->portno = value;
 
 
1968
1969        return count;
1970
1971}
1972
1973static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1974
1975const char *lcs_type[] = {
1976	"not a channel",
1977	"2216 parallel",
1978	"2216 channel",
1979	"OSA LCS card",
1980	"unknown channel type",
1981	"unsupported channel type",
1982};
1983
1984static ssize_t
1985lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1986{
1987	struct ccwgroup_device *cgdev;
1988
1989	cgdev = to_ccwgroupdev(dev);
1990	if (!cgdev)
1991		return -ENODEV;
1992
1993	return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1994}
1995
1996static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1997
1998static ssize_t
1999lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
2000{
2001	struct lcs_card *card;
2002
2003	card = dev_get_drvdata(dev);
2004
2005	return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
2006}
2007
2008static ssize_t
2009lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
2010{
2011        struct lcs_card *card;
2012        int value;
 
2013
2014	card = dev_get_drvdata(dev);
2015
2016        if (!card)
2017                return 0;
2018
2019        sscanf(buf, "%u", &value);
 
 
2020        /* TODO: sanity checks */
2021        card->lancmd_timeout = value;
2022
2023        return count;
2024
2025}
2026
2027static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2028
2029static ssize_t
2030lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2031		      const char *buf, size_t count)
2032{
2033	struct lcs_card *card = dev_get_drvdata(dev);
2034	char *tmp;
2035	int i;
2036
2037	if (!card)
2038		return -EINVAL;
2039	if (card->state != DEV_STATE_UP)
2040		return -EPERM;
2041	i = simple_strtoul(buf, &tmp, 16);
2042	if (i == 1)
2043		lcs_schedule_recovery(card);
2044	return count;
2045}
2046
2047static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2048
2049static struct attribute * lcs_attrs[] = {
2050	&dev_attr_portno.attr,
2051	&dev_attr_type.attr,
2052	&dev_attr_lancmd_timeout.attr,
2053	&dev_attr_recover.attr,
2054	NULL,
2055};
2056
2057static struct attribute_group lcs_attr_group = {
2058	.attrs = lcs_attrs,
2059};
 
 
 
 
 
 
 
 
2060
2061/**
2062 * lcs_probe_device is called on establishing a new ccwgroup_device.
2063 */
2064static int
2065lcs_probe_device(struct ccwgroup_device *ccwgdev)
2066{
2067	struct lcs_card *card;
2068	int ret;
2069
2070	if (!get_device(&ccwgdev->dev))
2071		return -ENODEV;
2072
2073	LCS_DBF_TEXT(2, setup, "add_dev");
2074        card = lcs_alloc_card();
2075        if (!card) {
2076		LCS_DBF_TEXT_(2, setup, "  rc%d", -ENOMEM);
2077		put_device(&ccwgdev->dev);
2078                return -ENOMEM;
2079        }
2080	ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2081	if (ret) {
2082		lcs_free_card(card);
2083		put_device(&ccwgdev->dev);
2084		return ret;
2085        }
2086	dev_set_drvdata(&ccwgdev->dev, card);
2087	ccwgdev->cdev[0]->handler = lcs_irq;
2088	ccwgdev->cdev[1]->handler = lcs_irq;
2089	card->gdev = ccwgdev;
2090	INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2091	card->thread_start_mask = 0;
2092	card->thread_allowed_mask = 0;
2093	card->thread_running_mask = 0;
2094        return 0;
 
 
2095}
2096
2097static int
2098lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2099{
2100	struct lcs_card *card;
2101
2102	LCS_DBF_TEXT(2, setup, "regnetdv");
2103	card = dev_get_drvdata(&ccwgdev->dev);
2104	if (card->dev->reg_state != NETREG_UNINITIALIZED)
2105		return 0;
2106	SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2107	return register_netdev(card->dev);
2108}
2109
2110/**
2111 * lcs_new_device will be called by setting the group device online.
2112 */
2113static const struct net_device_ops lcs_netdev_ops = {
2114	.ndo_open		= lcs_open_device,
2115	.ndo_stop		= lcs_stop_device,
2116	.ndo_get_stats		= lcs_getstats,
2117	.ndo_start_xmit		= lcs_start_xmit,
2118};
2119
2120static const struct net_device_ops lcs_mc_netdev_ops = {
2121	.ndo_open		= lcs_open_device,
2122	.ndo_stop		= lcs_stop_device,
2123	.ndo_get_stats		= lcs_getstats,
2124	.ndo_start_xmit		= lcs_start_xmit,
2125	.ndo_set_multicast_list = lcs_set_multicast_list,
2126};
2127
2128static int
2129lcs_new_device(struct ccwgroup_device *ccwgdev)
2130{
2131	struct  lcs_card *card;
2132	struct net_device *dev=NULL;
2133	enum lcs_dev_states recover_state;
2134	int rc;
2135
2136	card = dev_get_drvdata(&ccwgdev->dev);
2137	if (!card)
2138		return -ENODEV;
2139
2140	LCS_DBF_TEXT(2, setup, "newdev");
2141	LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2142	card->read.ccwdev  = ccwgdev->cdev[0];
2143	card->write.ccwdev = ccwgdev->cdev[1];
2144
2145	recover_state = card->state;
2146	rc = ccw_device_set_online(card->read.ccwdev);
2147	if (rc)
2148		goto out_err;
2149	rc = ccw_device_set_online(card->write.ccwdev);
2150	if (rc)
2151		goto out_werr;
2152
2153	LCS_DBF_TEXT(3, setup, "lcsnewdv");
2154
2155	lcs_setup_card(card);
2156	rc = lcs_detect(card);
2157	if (rc) {
2158		LCS_DBF_TEXT(2, setup, "dtctfail");
2159		dev_err(&card->dev->dev,
2160			"Detecting a network adapter for LCS devices"
2161			" failed with rc=%d (0x%x)\n", rc, rc);
2162		lcs_stopcard(card);
2163		goto out;
2164	}
2165	if (card->dev) {
2166		LCS_DBF_TEXT(2, setup, "samedev");
2167		LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2168		goto netdev_out;
2169	}
2170	switch (card->lan_type) {
2171#ifdef CONFIG_NET_ETHERNET
2172	case LCS_FRAME_TYPE_ENET:
2173		card->lan_type_trans = eth_type_trans;
2174		dev = alloc_etherdev(0);
2175		break;
2176#endif
2177#ifdef CONFIG_TR
2178	case LCS_FRAME_TYPE_TR:
2179		card->lan_type_trans = tr_type_trans;
2180		dev = alloc_trdev(0);
2181		break;
2182#endif
2183#ifdef CONFIG_FDDI
2184	case LCS_FRAME_TYPE_FDDI:
2185		card->lan_type_trans = fddi_type_trans;
2186		dev = alloc_fddidev(0);
2187		break;
2188#endif
2189	default:
2190		LCS_DBF_TEXT(3, setup, "errinit");
2191		pr_err(" Initialization failed\n");
2192		goto out;
2193	}
2194	if (!dev)
2195		goto out;
2196	card->dev = dev;
2197	card->dev->ml_priv = card;
2198	card->dev->netdev_ops = &lcs_netdev_ops;
2199	memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
 
2200#ifdef CONFIG_IP_MULTICAST
2201	if (!lcs_check_multicast_support(card))
2202		card->dev->netdev_ops = &lcs_mc_netdev_ops;
2203#endif
2204netdev_out:
2205	lcs_set_allowed_threads(card,0xffffffff);
2206	if (recover_state == DEV_STATE_RECOVER) {
2207		lcs_set_multicast_list(card->dev);
2208		card->dev->flags |= IFF_UP;
2209		netif_carrier_on(card->dev);
2210		netif_wake_queue(card->dev);
2211		card->state = DEV_STATE_UP;
2212	} else {
2213		lcs_stopcard(card);
2214	}
2215
2216	if (lcs_register_netdev(ccwgdev) != 0)
2217		goto out;
2218
2219	/* Print out supported assists: IPv6 */
2220	pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2221		(card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2222		"with" : "without");
2223	/* Print out supported assist: Multicast */
2224	pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2225		(card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2226		"with" : "without");
2227	return 0;
2228out:
2229
2230	ccw_device_set_offline(card->write.ccwdev);
2231out_werr:
2232	ccw_device_set_offline(card->read.ccwdev);
2233out_err:
2234	return -ENODEV;
2235}
2236
2237/**
2238 * lcs_shutdown_device, called when setting the group device offline.
2239 */
2240static int
2241__lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2242{
2243	struct lcs_card *card;
2244	enum lcs_dev_states recover_state;
2245	int ret;
2246
2247	LCS_DBF_TEXT(3, setup, "shtdndev");
2248	card = dev_get_drvdata(&ccwgdev->dev);
2249	if (!card)
2250		return -ENODEV;
2251	if (recovery_mode == 0) {
2252		lcs_set_allowed_threads(card, 0);
2253		if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2254			return -ERESTARTSYS;
2255	}
2256	LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2257	recover_state = card->state;
2258
2259	ret = lcs_stop_device(card->dev);
2260	ret = ccw_device_set_offline(card->read.ccwdev);
2261	ret = ccw_device_set_offline(card->write.ccwdev);
 
 
 
 
2262	if (recover_state == DEV_STATE_UP) {
2263		card->state = DEV_STATE_RECOVER;
2264	}
2265	if (ret)
2266		return ret;
2267	return 0;
2268}
2269
2270static int
2271lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2272{
2273	return __lcs_shutdown_device(ccwgdev, 0);
2274}
2275
2276/**
2277 * drive lcs recovery after startup and startlan initiated by Lan Gateway
2278 */
2279static int
2280lcs_recovery(void *ptr)
2281{
2282	struct lcs_card *card;
2283	struct ccwgroup_device *gdev;
2284        int rc;
2285
2286	card = (struct lcs_card *) ptr;
2287
2288	LCS_DBF_TEXT(4, trace, "recover1");
2289	if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2290		return 0;
2291	LCS_DBF_TEXT(4, trace, "recover2");
2292	gdev = card->gdev;
2293	dev_warn(&gdev->dev,
2294		"A recovery process has been started for the LCS device\n");
2295	rc = __lcs_shutdown_device(gdev, 1);
2296	rc = lcs_new_device(gdev);
2297	if (!rc)
2298		pr_info("Device %s successfully recovered!\n",
2299			card->dev->name);
2300	else
2301		pr_info("Device %s could not be recovered!\n",
2302			card->dev->name);
2303	lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2304	return 0;
2305}
2306
2307/**
2308 * lcs_remove_device, free buffers and card
2309 */
2310static void
2311lcs_remove_device(struct ccwgroup_device *ccwgdev)
2312{
2313	struct lcs_card *card;
2314
2315	card = dev_get_drvdata(&ccwgdev->dev);
2316	if (!card)
2317		return;
2318
2319	LCS_DBF_TEXT(3, setup, "remdev");
2320	LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2321	if (ccwgdev->state == CCWGROUP_ONLINE) {
2322		lcs_shutdown_device(ccwgdev);
2323	}
2324	if (card->dev)
2325		unregister_netdev(card->dev);
2326	sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2327	lcs_cleanup_card(card);
2328	lcs_free_card(card);
 
2329	put_device(&ccwgdev->dev);
2330}
2331
2332static int lcs_pm_suspend(struct lcs_card *card)
2333{
2334	if (card->dev)
2335		netif_device_detach(card->dev);
2336	lcs_set_allowed_threads(card, 0);
2337	lcs_wait_for_threads(card, 0xffffffff);
2338	if (card->state != DEV_STATE_DOWN)
2339		__lcs_shutdown_device(card->gdev, 1);
2340	return 0;
2341}
2342
2343static int lcs_pm_resume(struct lcs_card *card)
2344{
2345	int rc = 0;
2346
2347	if (card->state == DEV_STATE_RECOVER)
2348		rc = lcs_new_device(card->gdev);
2349	if (card->dev)
2350		netif_device_attach(card->dev);
2351	if (rc) {
2352		dev_warn(&card->gdev->dev, "The lcs device driver "
2353			"failed to recover the device\n");
2354	}
2355	return rc;
2356}
2357
2358static int lcs_prepare(struct ccwgroup_device *gdev)
2359{
2360	return 0;
2361}
2362
2363static void lcs_complete(struct ccwgroup_device *gdev)
2364{
2365	return;
2366}
2367
2368static int lcs_freeze(struct ccwgroup_device *gdev)
2369{
2370	struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2371	return lcs_pm_suspend(card);
2372}
2373
2374static int lcs_thaw(struct ccwgroup_device *gdev)
2375{
2376	struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2377	return lcs_pm_resume(card);
2378}
2379
2380static int lcs_restore(struct ccwgroup_device *gdev)
2381{
2382	struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2383	return lcs_pm_resume(card);
2384}
2385
2386static struct ccw_device_id lcs_ids[] = {
2387	{CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2388	{CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2389	{CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2390	{},
2391};
2392MODULE_DEVICE_TABLE(ccw, lcs_ids);
2393
2394static struct ccw_driver lcs_ccw_driver = {
2395	.driver = {
2396		.owner	= THIS_MODULE,
2397		.name	= "lcs",
2398	},
2399	.ids	= lcs_ids,
2400	.probe	= ccwgroup_probe_ccwdev,
2401	.remove	= ccwgroup_remove_ccwdev,
 
2402};
2403
2404/**
2405 * LCS ccwgroup driver registration
2406 */
2407static struct ccwgroup_driver lcs_group_driver = {
2408	.driver = {
2409		.owner	= THIS_MODULE,
2410		.name	= "lcs",
2411	},
2412	.max_slaves  = 2,
2413	.driver_id   = 0xD3C3E2,
2414	.probe       = lcs_probe_device,
2415	.remove      = lcs_remove_device,
2416	.set_online  = lcs_new_device,
2417	.set_offline = lcs_shutdown_device,
2418	.prepare     = lcs_prepare,
2419	.complete    = lcs_complete,
2420	.freeze	     = lcs_freeze,
2421	.thaw	     = lcs_thaw,
2422	.restore     = lcs_restore,
2423};
2424
2425static ssize_t
2426lcs_driver_group_store(struct device_driver *ddrv, const char *buf,
2427		       size_t count)
2428{
2429	int err;
2430	err = ccwgroup_create_from_string(lcs_root_dev,
2431					  lcs_group_driver.driver_id,
2432					  &lcs_ccw_driver, 2, buf);
2433	return err ? err : count;
2434}
 
2435
2436static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2437
2438static struct attribute *lcs_group_attrs[] = {
2439	&driver_attr_group.attr,
2440	NULL,
2441};
2442
2443static struct attribute_group lcs_group_attr_group = {
2444	.attrs = lcs_group_attrs,
2445};
2446
2447static const struct attribute_group *lcs_group_attr_groups[] = {
2448	&lcs_group_attr_group,
2449	NULL,
2450};
2451
2452/**
2453 *  LCS Module/Kernel initialization function
2454 */
2455static int
2456__init lcs_init_module(void)
2457{
2458	int rc;
2459
2460	pr_info("Loading %s\n", version);
2461	rc = lcs_register_debug_facility();
2462	LCS_DBF_TEXT(0, setup, "lcsinit");
2463	if (rc)
2464		goto out_err;
2465	lcs_root_dev = root_device_register("lcs");
2466	rc = IS_ERR(lcs_root_dev) ? PTR_ERR(lcs_root_dev) : 0;
2467	if (rc)
2468		goto register_err;
2469	rc = ccw_driver_register(&lcs_ccw_driver);
2470	if (rc)
2471		goto ccw_err;
2472	lcs_group_driver.driver.groups = lcs_group_attr_groups;
2473	rc = ccwgroup_driver_register(&lcs_group_driver);
2474	if (rc)
2475		goto ccwgroup_err;
2476	return 0;
2477
2478ccwgroup_err:
2479	ccw_driver_unregister(&lcs_ccw_driver);
2480ccw_err:
2481	root_device_unregister(lcs_root_dev);
2482register_err:
2483	lcs_unregister_debug_facility();
2484out_err:
2485	pr_err("Initializing the lcs device driver failed\n");
2486	return rc;
2487}
2488
2489
2490/**
2491 *  LCS module cleanup function
2492 */
2493static void
2494__exit lcs_cleanup_module(void)
2495{
2496	pr_info("Terminating lcs module.\n");
2497	LCS_DBF_TEXT(0, trace, "cleanup");
2498	driver_remove_file(&lcs_group_driver.driver,
2499			   &driver_attr_group);
2500	ccwgroup_driver_unregister(&lcs_group_driver);
2501	ccw_driver_unregister(&lcs_ccw_driver);
2502	root_device_unregister(lcs_root_dev);
2503	lcs_unregister_debug_facility();
2504}
2505
2506module_init(lcs_init_module);
2507module_exit(lcs_cleanup_module);
2508
2509MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2510MODULE_LICENSE("GPL");
2511