1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Linux for S/390 Lan Channel Station Network Driver 4 * 5 * Copyright IBM Corp. 1999, 2009 6 * Author(s): Original Code written by 7 * DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com> 8 * Rewritten by 9 * Frank Pavlic <fpavlic@de.ibm.com> and 10 * Martin Schwidefsky <schwidefsky@de.ibm.com> 11 */ 12 13#define KMSG_COMPONENT "lcs" 14#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 15 16#include <linux/module.h> 17#include <linux/if.h> 18#include <linux/netdevice.h> 19#include <linux/etherdevice.h> 20#include <linux/fddidevice.h> 21#include <linux/inetdevice.h> 22#include <linux/in.h> 23#include <linux/igmp.h> 24#include <linux/delay.h> 25#include <linux/kthread.h> 26#include <linux/slab.h> 27#include <net/arp.h> 28#include <net/ip.h> 29 30#include <asm/debug.h> 31#include <asm/idals.h> 32#include <asm/timex.h> 33#include <linux/device.h> 34#include <asm/ccwgroup.h> 35 36#include "lcs.h" 37 38 39#if !defined(CONFIG_ETHERNET) && !defined(CONFIG_FDDI) 40#error Cannot compile lcs.c without some net devices switched on. 41#endif 42 43/** 44 * initialization string for output 45 */ 46 47static char version[] __initdata = "LCS driver"; 48 49/** 50 * the root device for lcs group devices 51 */ 52static struct device *lcs_root_dev; 53 54/** 55 * Some prototypes. 56 */ 57static void lcs_tasklet(unsigned long); 58static void lcs_start_kernel_thread(struct work_struct *); 59static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *); 60#ifdef CONFIG_IP_MULTICAST 61static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *); 62#endif /* CONFIG_IP_MULTICAST */ 63static int lcs_recovery(void *ptr); 64 65/** 66 * Debug Facility Stuff 67 */ 68static char debug_buffer[255]; 69static debug_info_t *lcs_dbf_setup; 70static debug_info_t *lcs_dbf_trace; 71 72/** 73 * LCS Debug Facility functions 74 */ 75static void 76lcs_unregister_debug_facility(void) 77{ 78 debug_unregister(lcs_dbf_setup); 79 debug_unregister(lcs_dbf_trace); 80} 81 82static int 83lcs_register_debug_facility(void) 84{ 85 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8); 86 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8); 87 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) { 88 pr_err("Not enough memory for debug facility.\n"); 89 lcs_unregister_debug_facility(); 90 return -ENOMEM; 91 } 92 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view); 93 debug_set_level(lcs_dbf_setup, 2); 94 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view); 95 debug_set_level(lcs_dbf_trace, 2); 96 return 0; 97} 98 99/** 100 * Allocate io buffers. 101 */ 102static int 103lcs_alloc_channel(struct lcs_channel *channel) 104{ 105 int cnt; 106 107 LCS_DBF_TEXT(2, setup, "ichalloc"); 108 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) { 109 /* alloc memory fo iobuffer */ 110 channel->iob[cnt].data = 111 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL); 112 if (channel->iob[cnt].data == NULL) 113 break; 114 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY; 115 } 116 if (cnt < LCS_NUM_BUFFS) { 117 /* Not all io buffers could be allocated. */ 118 LCS_DBF_TEXT(2, setup, "echalloc"); 119 while (cnt-- > 0) 120 kfree(channel->iob[cnt].data); 121 return -ENOMEM; 122 } 123 return 0; 124} 125 126/** 127 * Free io buffers. 128 */ 129static void 130lcs_free_channel(struct lcs_channel *channel) 131{ 132 int cnt; 133 134 LCS_DBF_TEXT(2, setup, "ichfree"); 135 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) { 136 kfree(channel->iob[cnt].data); 137 channel->iob[cnt].data = NULL; 138 } 139} 140 141/* 142 * Cleanup channel. 143 */ 144static void 145lcs_cleanup_channel(struct lcs_channel *channel) 146{ 147 LCS_DBF_TEXT(3, setup, "cleanch"); 148 /* Kill write channel tasklets. */ 149 tasklet_kill(&channel->irq_tasklet); 150 /* Free channel buffers. */ 151 lcs_free_channel(channel); 152} 153 154/** 155 * LCS free memory for card and channels. 156 */ 157static void 158lcs_free_card(struct lcs_card *card) 159{ 160 LCS_DBF_TEXT(2, setup, "remcard"); 161 LCS_DBF_HEX(2, setup, &card, sizeof(void*)); 162 kfree(card); 163} 164 165/** 166 * LCS alloc memory for card and channels 167 */ 168static struct lcs_card * 169lcs_alloc_card(void) 170{ 171 struct lcs_card *card; 172 int rc; 173 174 LCS_DBF_TEXT(2, setup, "alloclcs"); 175 176 card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA); 177 if (card == NULL) 178 return NULL; 179 card->lan_type = LCS_FRAME_TYPE_AUTO; 180 card->pkt_seq = 0; 181 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT; 182 /* Allocate io buffers for the read channel. */ 183 rc = lcs_alloc_channel(&card->read); 184 if (rc){ 185 LCS_DBF_TEXT(2, setup, "iccwerr"); 186 lcs_free_card(card); 187 return NULL; 188 } 189 /* Allocate io buffers for the write channel. */ 190 rc = lcs_alloc_channel(&card->write); 191 if (rc) { 192 LCS_DBF_TEXT(2, setup, "iccwerr"); 193 lcs_cleanup_channel(&card->read); 194 lcs_free_card(card); 195 return NULL; 196 } 197 198#ifdef CONFIG_IP_MULTICAST 199 INIT_LIST_HEAD(&card->ipm_list); 200#endif 201 LCS_DBF_HEX(2, setup, &card, sizeof(void*)); 202 return card; 203} 204 205/* 206 * Setup read channel. 207 */ 208static void 209lcs_setup_read_ccws(struct lcs_card *card) 210{ 211 int cnt; 212 213 LCS_DBF_TEXT(2, setup, "ireadccw"); 214 /* Setup read ccws. */ 215 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1)); 216 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) { 217 card->read.ccws[cnt].cmd_code = LCS_CCW_READ; 218 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE; 219 card->read.ccws[cnt].flags = 220 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI; 221 /* 222 * Note: we have allocated the buffer with GFP_DMA, so 223 * we do not need to do set_normalized_cda. 224 */ 225 card->read.ccws[cnt].cda = 226 (__u32) __pa(card->read.iob[cnt].data); 227 ((struct lcs_header *) 228 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET; 229 card->read.iob[cnt].callback = lcs_get_frames_cb; 230 card->read.iob[cnt].state = LCS_BUF_STATE_READY; 231 card->read.iob[cnt].count = LCS_IOBUFFERSIZE; 232 } 233 card->read.ccws[0].flags &= ~CCW_FLAG_PCI; 234 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI; 235 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND; 236 /* Last ccw is a tic (transfer in channel). */ 237 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER; 238 card->read.ccws[LCS_NUM_BUFFS].cda = 239 (__u32) __pa(card->read.ccws); 240 /* Setg initial state of the read channel. */ 241 card->read.state = LCS_CH_STATE_INIT; 242 243 card->read.io_idx = 0; 244 card->read.buf_idx = 0; 245} 246 247static void 248lcs_setup_read(struct lcs_card *card) 249{ 250 LCS_DBF_TEXT(3, setup, "initread"); 251 252 lcs_setup_read_ccws(card); 253 /* Initialize read channel tasklet. */ 254 card->read.irq_tasklet.data = (unsigned long) &card->read; 255 card->read.irq_tasklet.func = lcs_tasklet; 256 /* Initialize waitqueue. */ 257 init_waitqueue_head(&card->read.wait_q); 258} 259 260/* 261 * Setup write channel. 262 */ 263static void 264lcs_setup_write_ccws(struct lcs_card *card) 265{ 266 int cnt; 267 268 LCS_DBF_TEXT(3, setup, "iwritccw"); 269 /* Setup write ccws. */ 270 memset(card->write.ccws, 0, sizeof(struct ccw1) * (LCS_NUM_BUFFS + 1)); 271 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) { 272 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE; 273 card->write.ccws[cnt].count = 0; 274 card->write.ccws[cnt].flags = 275 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI; 276 /* 277 * Note: we have allocated the buffer with GFP_DMA, so 278 * we do not need to do set_normalized_cda. 279 */ 280 card->write.ccws[cnt].cda = 281 (__u32) __pa(card->write.iob[cnt].data); 282 } 283 /* Last ccw is a tic (transfer in channel). */ 284 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER; 285 card->write.ccws[LCS_NUM_BUFFS].cda = 286 (__u32) __pa(card->write.ccws); 287 /* Set initial state of the write channel. */ 288 card->read.state = LCS_CH_STATE_INIT; 289 290 card->write.io_idx = 0; 291 card->write.buf_idx = 0; 292} 293 294static void 295lcs_setup_write(struct lcs_card *card) 296{ 297 LCS_DBF_TEXT(3, setup, "initwrit"); 298 299 lcs_setup_write_ccws(card); 300 /* Initialize write channel tasklet. */ 301 card->write.irq_tasklet.data = (unsigned long) &card->write; 302 card->write.irq_tasklet.func = lcs_tasklet; 303 /* Initialize waitqueue. */ 304 init_waitqueue_head(&card->write.wait_q); 305} 306 307static void 308lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads) 309{ 310 unsigned long flags; 311 312 spin_lock_irqsave(&card->mask_lock, flags); 313 card->thread_allowed_mask = threads; 314 spin_unlock_irqrestore(&card->mask_lock, flags); 315 wake_up(&card->wait_q); 316} 317static int lcs_threads_running(struct lcs_card *card, unsigned long threads) 318{ 319 unsigned long flags; 320 int rc = 0; 321 322 spin_lock_irqsave(&card->mask_lock, flags); 323 rc = (card->thread_running_mask & threads); 324 spin_unlock_irqrestore(&card->mask_lock, flags); 325 return rc; 326} 327 328static int 329lcs_wait_for_threads(struct lcs_card *card, unsigned long threads) 330{ 331 return wait_event_interruptible(card->wait_q, 332 lcs_threads_running(card, threads) == 0); 333} 334 335static int lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread) 336{ 337 unsigned long flags; 338 339 spin_lock_irqsave(&card->mask_lock, flags); 340 if ( !(card->thread_allowed_mask & thread) || 341 (card->thread_start_mask & thread) ) { 342 spin_unlock_irqrestore(&card->mask_lock, flags); 343 return -EPERM; 344 } 345 card->thread_start_mask |= thread; 346 spin_unlock_irqrestore(&card->mask_lock, flags); 347 return 0; 348} 349 350static void 351lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread) 352{ 353 unsigned long flags; 354 355 spin_lock_irqsave(&card->mask_lock, flags); 356 card->thread_running_mask &= ~thread; 357 spin_unlock_irqrestore(&card->mask_lock, flags); 358 wake_up(&card->wait_q); 359} 360 361static int __lcs_do_run_thread(struct lcs_card *card, unsigned long thread) 362{ 363 unsigned long flags; 364 int rc = 0; 365 366 spin_lock_irqsave(&card->mask_lock, flags); 367 if (card->thread_start_mask & thread){ 368 if ((card->thread_allowed_mask & thread) && 369 !(card->thread_running_mask & thread)){ 370 rc = 1; 371 card->thread_start_mask &= ~thread; 372 card->thread_running_mask |= thread; 373 } else 374 rc = -EPERM; 375 } 376 spin_unlock_irqrestore(&card->mask_lock, flags); 377 return rc; 378} 379 380static int 381lcs_do_run_thread(struct lcs_card *card, unsigned long thread) 382{ 383 int rc = 0; 384 wait_event(card->wait_q, 385 (rc = __lcs_do_run_thread(card, thread)) >= 0); 386 return rc; 387} 388 389static int 390lcs_do_start_thread(struct lcs_card *card, unsigned long thread) 391{ 392 unsigned long flags; 393 int rc = 0; 394 395 spin_lock_irqsave(&card->mask_lock, flags); 396 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x", 397 (u8) card->thread_start_mask, 398 (u8) card->thread_allowed_mask, 399 (u8) card->thread_running_mask); 400 rc = (card->thread_start_mask & thread); 401 spin_unlock_irqrestore(&card->mask_lock, flags); 402 return rc; 403} 404 405/** 406 * Initialize channels,card and state machines. 407 */ 408static void 409lcs_setup_card(struct lcs_card *card) 410{ 411 LCS_DBF_TEXT(2, setup, "initcard"); 412 LCS_DBF_HEX(2, setup, &card, sizeof(void*)); 413 414 lcs_setup_read(card); 415 lcs_setup_write(card); 416 /* Set cards initial state. */ 417 card->state = DEV_STATE_DOWN; 418 card->tx_buffer = NULL; 419 card->tx_emitted = 0; 420 421 init_waitqueue_head(&card->wait_q); 422 spin_lock_init(&card->lock); 423 spin_lock_init(&card->ipm_lock); 424 spin_lock_init(&card->mask_lock); 425#ifdef CONFIG_IP_MULTICAST 426 INIT_LIST_HEAD(&card->ipm_list); 427#endif 428 INIT_LIST_HEAD(&card->lancmd_waiters); 429} 430 431static void lcs_clear_multicast_list(struct lcs_card *card) 432{ 433#ifdef CONFIG_IP_MULTICAST 434 struct lcs_ipm_list *ipm; 435 unsigned long flags; 436 437 /* Free multicast list. */ 438 LCS_DBF_TEXT(3, setup, "clmclist"); 439 spin_lock_irqsave(&card->ipm_lock, flags); 440 while (!list_empty(&card->ipm_list)){ 441 ipm = list_entry(card->ipm_list.next, 442 struct lcs_ipm_list, list); 443 list_del(&ipm->list); 444 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){ 445 spin_unlock_irqrestore(&card->ipm_lock, flags); 446 lcs_send_delipm(card, ipm); 447 spin_lock_irqsave(&card->ipm_lock, flags); 448 } 449 kfree(ipm); 450 } 451 spin_unlock_irqrestore(&card->ipm_lock, flags); 452#endif 453} 454/** 455 * Cleanup channels,card and state machines. 456 */ 457static void 458lcs_cleanup_card(struct lcs_card *card) 459{ 460 461 LCS_DBF_TEXT(3, setup, "cleancrd"); 462 LCS_DBF_HEX(2,setup,&card,sizeof(void*)); 463 464 if (card->dev != NULL) 465 free_netdev(card->dev); 466 /* Cleanup channels. */ 467 lcs_cleanup_channel(&card->write); 468 lcs_cleanup_channel(&card->read); 469} 470 471/** 472 * Start channel. 473 */ 474static int 475lcs_start_channel(struct lcs_channel *channel) 476{ 477 unsigned long flags; 478 int rc; 479 480 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev)); 481 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 482 rc = ccw_device_start(channel->ccwdev, 483 channel->ccws + channel->io_idx, 0, 0, 484 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND); 485 if (rc == 0) 486 channel->state = LCS_CH_STATE_RUNNING; 487 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 488 if (rc) { 489 LCS_DBF_TEXT_(4,trace,"essh%s", 490 dev_name(&channel->ccwdev->dev)); 491 dev_err(&channel->ccwdev->dev, 492 "Starting an LCS device resulted in an error," 493 " rc=%d!\n", rc); 494 } 495 return rc; 496} 497 498static int 499lcs_clear_channel(struct lcs_channel *channel) 500{ 501 unsigned long flags; 502 int rc; 503 504 LCS_DBF_TEXT(4,trace,"clearch"); 505 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev)); 506 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 507 rc = ccw_device_clear(channel->ccwdev, 0); 508 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 509 if (rc) { 510 LCS_DBF_TEXT_(4, trace, "ecsc%s", 511 dev_name(&channel->ccwdev->dev)); 512 return rc; 513 } 514 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED)); 515 channel->state = LCS_CH_STATE_STOPPED; 516 return rc; 517} 518 519 520/** 521 * Stop channel. 522 */ 523static int 524lcs_stop_channel(struct lcs_channel *channel) 525{ 526 unsigned long flags; 527 int rc; 528 529 if (channel->state == LCS_CH_STATE_STOPPED) 530 return 0; 531 LCS_DBF_TEXT(4,trace,"haltsch"); 532 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev)); 533 channel->state = LCS_CH_STATE_INIT; 534 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 535 rc = ccw_device_halt(channel->ccwdev, 0); 536 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 537 if (rc) { 538 LCS_DBF_TEXT_(4, trace, "ehsc%s", 539 dev_name(&channel->ccwdev->dev)); 540 return rc; 541 } 542 /* Asynchronous halt initialted. Wait for its completion. */ 543 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED)); 544 lcs_clear_channel(channel); 545 return 0; 546} 547 548/** 549 * start read and write channel 550 */ 551static int 552lcs_start_channels(struct lcs_card *card) 553{ 554 int rc; 555 556 LCS_DBF_TEXT(2, trace, "chstart"); 557 /* start read channel */ 558 rc = lcs_start_channel(&card->read); 559 if (rc) 560 return rc; 561 /* start write channel */ 562 rc = lcs_start_channel(&card->write); 563 if (rc) 564 lcs_stop_channel(&card->read); 565 return rc; 566} 567 568/** 569 * stop read and write channel 570 */ 571static int 572lcs_stop_channels(struct lcs_card *card) 573{ 574 LCS_DBF_TEXT(2, trace, "chhalt"); 575 lcs_stop_channel(&card->read); 576 lcs_stop_channel(&card->write); 577 return 0; 578} 579 580/** 581 * Get empty buffer. 582 */ 583static struct lcs_buffer * 584__lcs_get_buffer(struct lcs_channel *channel) 585{ 586 int index; 587 588 LCS_DBF_TEXT(5, trace, "_getbuff"); 589 index = channel->io_idx; 590 do { 591 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) { 592 channel->iob[index].state = LCS_BUF_STATE_LOCKED; 593 return channel->iob + index; 594 } 595 index = (index + 1) & (LCS_NUM_BUFFS - 1); 596 } while (index != channel->io_idx); 597 return NULL; 598} 599 600static struct lcs_buffer * 601lcs_get_buffer(struct lcs_channel *channel) 602{ 603 struct lcs_buffer *buffer; 604 unsigned long flags; 605 606 LCS_DBF_TEXT(5, trace, "getbuff"); 607 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 608 buffer = __lcs_get_buffer(channel); 609 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 610 return buffer; 611} 612 613/** 614 * Resume channel program if the channel is suspended. 615 */ 616static int 617__lcs_resume_channel(struct lcs_channel *channel) 618{ 619 int rc; 620 621 if (channel->state != LCS_CH_STATE_SUSPENDED) 622 return 0; 623 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND) 624 return 0; 625 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev)); 626 rc = ccw_device_resume(channel->ccwdev); 627 if (rc) { 628 LCS_DBF_TEXT_(4, trace, "ersc%s", 629 dev_name(&channel->ccwdev->dev)); 630 dev_err(&channel->ccwdev->dev, 631 "Sending data from the LCS device to the LAN failed" 632 " with rc=%d\n",rc); 633 } else 634 channel->state = LCS_CH_STATE_RUNNING; 635 return rc; 636 637} 638 639/** 640 * Make a buffer ready for processing. 641 */ 642static void __lcs_ready_buffer_bits(struct lcs_channel *channel, int index) 643{ 644 int prev, next; 645 646 LCS_DBF_TEXT(5, trace, "rdybits"); 647 prev = (index - 1) & (LCS_NUM_BUFFS - 1); 648 next = (index + 1) & (LCS_NUM_BUFFS - 1); 649 /* Check if we may clear the suspend bit of this buffer. */ 650 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) { 651 /* Check if we have to set the PCI bit. */ 652 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND)) 653 /* Suspend bit of the previous buffer is not set. */ 654 channel->ccws[index].flags |= CCW_FLAG_PCI; 655 /* Suspend bit of the next buffer is set. */ 656 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND; 657 } 658} 659 660static int 661lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer) 662{ 663 unsigned long flags; 664 int index, rc; 665 666 LCS_DBF_TEXT(5, trace, "rdybuff"); 667 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED && 668 buffer->state != LCS_BUF_STATE_PROCESSED); 669 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 670 buffer->state = LCS_BUF_STATE_READY; 671 index = buffer - channel->iob; 672 /* Set length. */ 673 channel->ccws[index].count = buffer->count; 674 /* Check relevant PCI/suspend bits. */ 675 __lcs_ready_buffer_bits(channel, index); 676 rc = __lcs_resume_channel(channel); 677 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 678 return rc; 679} 680 681/** 682 * Mark the buffer as processed. Take care of the suspend bit 683 * of the previous buffer. This function is called from 684 * interrupt context, so the lock must not be taken. 685 */ 686static int 687__lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer) 688{ 689 int index, prev, next; 690 691 LCS_DBF_TEXT(5, trace, "prcsbuff"); 692 BUG_ON(buffer->state != LCS_BUF_STATE_READY); 693 buffer->state = LCS_BUF_STATE_PROCESSED; 694 index = buffer - channel->iob; 695 prev = (index - 1) & (LCS_NUM_BUFFS - 1); 696 next = (index + 1) & (LCS_NUM_BUFFS - 1); 697 /* Set the suspend bit and clear the PCI bit of this buffer. */ 698 channel->ccws[index].flags |= CCW_FLAG_SUSPEND; 699 channel->ccws[index].flags &= ~CCW_FLAG_PCI; 700 /* Check the suspend bit of the previous buffer. */ 701 if (channel->iob[prev].state == LCS_BUF_STATE_READY) { 702 /* 703 * Previous buffer is in state ready. It might have 704 * happened in lcs_ready_buffer that the suspend bit 705 * has not been cleared to avoid an endless loop. 706 * Do it now. 707 */ 708 __lcs_ready_buffer_bits(channel, prev); 709 } 710 /* Clear PCI bit of next buffer. */ 711 channel->ccws[next].flags &= ~CCW_FLAG_PCI; 712 return __lcs_resume_channel(channel); 713} 714 715/** 716 * Put a processed buffer back to state empty. 717 */ 718static void 719lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer) 720{ 721 unsigned long flags; 722 723 LCS_DBF_TEXT(5, trace, "relbuff"); 724 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED && 725 buffer->state != LCS_BUF_STATE_PROCESSED); 726 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 727 buffer->state = LCS_BUF_STATE_EMPTY; 728 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 729} 730 731/** 732 * Get buffer for a lan command. 733 */ 734static struct lcs_buffer * 735lcs_get_lancmd(struct lcs_card *card, int count) 736{ 737 struct lcs_buffer *buffer; 738 struct lcs_cmd *cmd; 739 740 LCS_DBF_TEXT(4, trace, "getlncmd"); 741 /* Get buffer and wait if none is available. */ 742 wait_event(card->write.wait_q, 743 ((buffer = lcs_get_buffer(&card->write)) != NULL)); 744 count += sizeof(struct lcs_header); 745 *(__u16 *)(buffer->data + count) = 0; 746 buffer->count = count + sizeof(__u16); 747 buffer->callback = lcs_release_buffer; 748 cmd = (struct lcs_cmd *) buffer->data; 749 cmd->offset = count; 750 cmd->type = LCS_FRAME_TYPE_CONTROL; 751 cmd->slot = 0; 752 return buffer; 753} 754 755 756static void 757lcs_get_reply(struct lcs_reply *reply) 758{ 759 refcount_inc(&reply->refcnt); 760} 761 762static void 763lcs_put_reply(struct lcs_reply *reply) 764{ 765 if (refcount_dec_and_test(&reply->refcnt)) 766 kfree(reply); 767} 768 769static struct lcs_reply * 770lcs_alloc_reply(struct lcs_cmd *cmd) 771{ 772 struct lcs_reply *reply; 773 774 LCS_DBF_TEXT(4, trace, "getreply"); 775 776 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC); 777 if (!reply) 778 return NULL; 779 refcount_set(&reply->refcnt, 1); 780 reply->sequence_no = cmd->sequence_no; 781 reply->received = 0; 782 reply->rc = 0; 783 init_waitqueue_head(&reply->wait_q); 784 785 return reply; 786} 787 788/** 789 * Notifier function for lancmd replies. Called from read irq. 790 */ 791static void 792lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd) 793{ 794 struct list_head *l, *n; 795 struct lcs_reply *reply; 796 797 LCS_DBF_TEXT(4, trace, "notiwait"); 798 spin_lock(&card->lock); 799 list_for_each_safe(l, n, &card->lancmd_waiters) { 800 reply = list_entry(l, struct lcs_reply, list); 801 if (reply->sequence_no == cmd->sequence_no) { 802 lcs_get_reply(reply); 803 list_del_init(&reply->list); 804 if (reply->callback != NULL) 805 reply->callback(card, cmd); 806 reply->received = 1; 807 reply->rc = cmd->return_code; 808 wake_up(&reply->wait_q); 809 lcs_put_reply(reply); 810 break; 811 } 812 } 813 spin_unlock(&card->lock); 814} 815 816/** 817 * Emit buffer of a lan command. 818 */ 819static void 820lcs_lancmd_timeout(struct timer_list *t) 821{ 822 struct lcs_reply *reply = from_timer(reply, t, timer); 823 struct lcs_reply *list_reply, *r; 824 unsigned long flags; 825 826 LCS_DBF_TEXT(4, trace, "timeout"); 827 spin_lock_irqsave(&reply->card->lock, flags); 828 list_for_each_entry_safe(list_reply, r, 829 &reply->card->lancmd_waiters,list) { 830 if (reply == list_reply) { 831 lcs_get_reply(reply); 832 list_del_init(&reply->list); 833 spin_unlock_irqrestore(&reply->card->lock, flags); 834 reply->received = 1; 835 reply->rc = -ETIME; 836 wake_up(&reply->wait_q); 837 lcs_put_reply(reply); 838 return; 839 } 840 } 841 spin_unlock_irqrestore(&reply->card->lock, flags); 842} 843 844static int 845lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer, 846 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *)) 847{ 848 struct lcs_reply *reply; 849 struct lcs_cmd *cmd; 850 unsigned long flags; 851 int rc; 852 853 LCS_DBF_TEXT(4, trace, "sendcmd"); 854 cmd = (struct lcs_cmd *) buffer->data; 855 cmd->return_code = 0; 856 cmd->sequence_no = card->sequence_no++; 857 reply = lcs_alloc_reply(cmd); 858 if (!reply) 859 return -ENOMEM; 860 reply->callback = reply_callback; 861 reply->card = card; 862 spin_lock_irqsave(&card->lock, flags); 863 list_add_tail(&reply->list, &card->lancmd_waiters); 864 spin_unlock_irqrestore(&card->lock, flags); 865 866 buffer->callback = lcs_release_buffer; 867 rc = lcs_ready_buffer(&card->write, buffer); 868 if (rc) 869 return rc; 870 timer_setup(&reply->timer, lcs_lancmd_timeout, 0); 871 mod_timer(&reply->timer, jiffies + HZ * card->lancmd_timeout); 872 wait_event(reply->wait_q, reply->received); 873 del_timer_sync(&reply->timer); 874 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc); 875 rc = reply->rc; 876 lcs_put_reply(reply); 877 return rc ? -EIO : 0; 878} 879 880/** 881 * LCS startup command 882 */ 883static int 884lcs_send_startup(struct lcs_card *card, __u8 initiator) 885{ 886 struct lcs_buffer *buffer; 887 struct lcs_cmd *cmd; 888 889 LCS_DBF_TEXT(2, trace, "startup"); 890 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 891 cmd = (struct lcs_cmd *) buffer->data; 892 cmd->cmd_code = LCS_CMD_STARTUP; 893 cmd->initiator = initiator; 894 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE; 895 return lcs_send_lancmd(card, buffer, NULL); 896} 897 898/** 899 * LCS shutdown command 900 */ 901static int 902lcs_send_shutdown(struct lcs_card *card) 903{ 904 struct lcs_buffer *buffer; 905 struct lcs_cmd *cmd; 906 907 LCS_DBF_TEXT(2, trace, "shutdown"); 908 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 909 cmd = (struct lcs_cmd *) buffer->data; 910 cmd->cmd_code = LCS_CMD_SHUTDOWN; 911 cmd->initiator = LCS_INITIATOR_TCPIP; 912 return lcs_send_lancmd(card, buffer, NULL); 913} 914 915/** 916 * LCS lanstat command 917 */ 918static void 919__lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd) 920{ 921 LCS_DBF_TEXT(2, trace, "statcb"); 922 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH); 923} 924 925static int 926lcs_send_lanstat(struct lcs_card *card) 927{ 928 struct lcs_buffer *buffer; 929 struct lcs_cmd *cmd; 930 931 LCS_DBF_TEXT(2,trace, "cmdstat"); 932 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 933 cmd = (struct lcs_cmd *) buffer->data; 934 /* Setup lanstat command. */ 935 cmd->cmd_code = LCS_CMD_LANSTAT; 936 cmd->initiator = LCS_INITIATOR_TCPIP; 937 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type; 938 cmd->cmd.lcs_std_cmd.portno = card->portno; 939 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb); 940} 941 942/** 943 * send stoplan command 944 */ 945static int 946lcs_send_stoplan(struct lcs_card *card, __u8 initiator) 947{ 948 struct lcs_buffer *buffer; 949 struct lcs_cmd *cmd; 950 951 LCS_DBF_TEXT(2, trace, "cmdstpln"); 952 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 953 cmd = (struct lcs_cmd *) buffer->data; 954 cmd->cmd_code = LCS_CMD_STOPLAN; 955 cmd->initiator = initiator; 956 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type; 957 cmd->cmd.lcs_std_cmd.portno = card->portno; 958 return lcs_send_lancmd(card, buffer, NULL); 959} 960 961/** 962 * send startlan command 963 */ 964static void 965__lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd) 966{ 967 LCS_DBF_TEXT(2, trace, "srtlancb"); 968 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type; 969 card->portno = cmd->cmd.lcs_std_cmd.portno; 970} 971 972static int 973lcs_send_startlan(struct lcs_card *card, __u8 initiator) 974{ 975 struct lcs_buffer *buffer; 976 struct lcs_cmd *cmd; 977 978 LCS_DBF_TEXT(2, trace, "cmdstaln"); 979 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 980 cmd = (struct lcs_cmd *) buffer->data; 981 cmd->cmd_code = LCS_CMD_STARTLAN; 982 cmd->initiator = initiator; 983 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type; 984 cmd->cmd.lcs_std_cmd.portno = card->portno; 985 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb); 986} 987 988#ifdef CONFIG_IP_MULTICAST 989/** 990 * send setipm command (Multicast) 991 */ 992static int 993lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list) 994{ 995 struct lcs_buffer *buffer; 996 struct lcs_cmd *cmd; 997 998 LCS_DBF_TEXT(2, trace, "cmdsetim"); 999 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE); 1000 cmd = (struct lcs_cmd *) buffer->data; 1001 cmd->cmd_code = LCS_CMD_SETIPM; 1002 cmd->initiator = LCS_INITIATOR_TCPIP; 1003 cmd->cmd.lcs_qipassist.lan_type = card->lan_type; 1004 cmd->cmd.lcs_qipassist.portno = card->portno; 1005 cmd->cmd.lcs_qipassist.version = 4; 1006 cmd->cmd.lcs_qipassist.num_ip_pairs = 1; 1007 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair, 1008 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair)); 1009 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr); 1010 return lcs_send_lancmd(card, buffer, NULL); 1011} 1012 1013/** 1014 * send delipm command (Multicast) 1015 */ 1016static int 1017lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list) 1018{ 1019 struct lcs_buffer *buffer; 1020 struct lcs_cmd *cmd; 1021 1022 LCS_DBF_TEXT(2, trace, "cmddelim"); 1023 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE); 1024 cmd = (struct lcs_cmd *) buffer->data; 1025 cmd->cmd_code = LCS_CMD_DELIPM; 1026 cmd->initiator = LCS_INITIATOR_TCPIP; 1027 cmd->cmd.lcs_qipassist.lan_type = card->lan_type; 1028 cmd->cmd.lcs_qipassist.portno = card->portno; 1029 cmd->cmd.lcs_qipassist.version = 4; 1030 cmd->cmd.lcs_qipassist.num_ip_pairs = 1; 1031 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair, 1032 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair)); 1033 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr); 1034 return lcs_send_lancmd(card, buffer, NULL); 1035} 1036 1037/** 1038 * check if multicast is supported by LCS 1039 */ 1040static void 1041__lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd) 1042{ 1043 LCS_DBF_TEXT(2, trace, "chkmccb"); 1044 card->ip_assists_supported = 1045 cmd->cmd.lcs_qipassist.ip_assists_supported; 1046 card->ip_assists_enabled = 1047 cmd->cmd.lcs_qipassist.ip_assists_enabled; 1048} 1049 1050static int 1051lcs_check_multicast_support(struct lcs_card *card) 1052{ 1053 struct lcs_buffer *buffer; 1054 struct lcs_cmd *cmd; 1055 int rc; 1056 1057 LCS_DBF_TEXT(2, trace, "cmdqipa"); 1058 /* Send query ipassist. */ 1059 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 1060 cmd = (struct lcs_cmd *) buffer->data; 1061 cmd->cmd_code = LCS_CMD_QIPASSIST; 1062 cmd->initiator = LCS_INITIATOR_TCPIP; 1063 cmd->cmd.lcs_qipassist.lan_type = card->lan_type; 1064 cmd->cmd.lcs_qipassist.portno = card->portno; 1065 cmd->cmd.lcs_qipassist.version = 4; 1066 cmd->cmd.lcs_qipassist.num_ip_pairs = 1; 1067 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb); 1068 if (rc != 0) { 1069 pr_err("Query IPAssist failed. Assuming unsupported!\n"); 1070 return -EOPNOTSUPP; 1071 } 1072 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) 1073 return 0; 1074 return -EOPNOTSUPP; 1075} 1076 1077/** 1078 * set or del multicast address on LCS card 1079 */ 1080static void 1081lcs_fix_multicast_list(struct lcs_card *card) 1082{ 1083 struct list_head failed_list; 1084 struct lcs_ipm_list *ipm, *tmp; 1085 unsigned long flags; 1086 int rc; 1087 1088 LCS_DBF_TEXT(4,trace, "fixipm"); 1089 INIT_LIST_HEAD(&failed_list); 1090 spin_lock_irqsave(&card->ipm_lock, flags); 1091list_modified: 1092 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){ 1093 switch (ipm->ipm_state) { 1094 case LCS_IPM_STATE_SET_REQUIRED: 1095 /* del from ipm_list so no one else can tamper with 1096 * this entry */ 1097 list_del_init(&ipm->list); 1098 spin_unlock_irqrestore(&card->ipm_lock, flags); 1099 rc = lcs_send_setipm(card, ipm); 1100 spin_lock_irqsave(&card->ipm_lock, flags); 1101 if (rc) { 1102 pr_info("Adding multicast address failed." 1103 " Table possibly full!\n"); 1104 /* store ipm in failed list -> will be added 1105 * to ipm_list again, so a retry will be done 1106 * during the next call of this function */ 1107 list_add_tail(&ipm->list, &failed_list); 1108 } else { 1109 ipm->ipm_state = LCS_IPM_STATE_ON_CARD; 1110 /* re-insert into ipm_list */ 1111 list_add_tail(&ipm->list, &card->ipm_list); 1112 } 1113 goto list_modified; 1114 case LCS_IPM_STATE_DEL_REQUIRED: 1115 list_del(&ipm->list); 1116 spin_unlock_irqrestore(&card->ipm_lock, flags); 1117 lcs_send_delipm(card, ipm); 1118 spin_lock_irqsave(&card->ipm_lock, flags); 1119 kfree(ipm); 1120 goto list_modified; 1121 case LCS_IPM_STATE_ON_CARD: 1122 break; 1123 } 1124 } 1125 /* re-insert all entries from the failed_list into ipm_list */ 1126 list_for_each_entry_safe(ipm, tmp, &failed_list, list) 1127 list_move_tail(&ipm->list, &card->ipm_list); 1128 1129 spin_unlock_irqrestore(&card->ipm_lock, flags); 1130} 1131 1132/** 1133 * get mac address for the relevant Multicast address 1134 */ 1135static void 1136lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev) 1137{ 1138 LCS_DBF_TEXT(4,trace, "getmac"); 1139 ip_eth_mc_map(ipm, mac); 1140} 1141 1142/** 1143 * function called by net device to handle multicast address relevant things 1144 */ 1145static void lcs_remove_mc_addresses(struct lcs_card *card, 1146 struct in_device *in4_dev) 1147{ 1148 struct ip_mc_list *im4; 1149 struct list_head *l; 1150 struct lcs_ipm_list *ipm; 1151 unsigned long flags; 1152 char buf[MAX_ADDR_LEN]; 1153 1154 LCS_DBF_TEXT(4, trace, "remmclst"); 1155 spin_lock_irqsave(&card->ipm_lock, flags); 1156 list_for_each(l, &card->ipm_list) { 1157 ipm = list_entry(l, struct lcs_ipm_list, list); 1158 for (im4 = rcu_dereference(in4_dev->mc_list); 1159 im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) { 1160 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev); 1161 if ( (ipm->ipm.ip_addr == im4->multiaddr) && 1162 (memcmp(buf, &ipm->ipm.mac_addr, 1163 LCS_MAC_LENGTH) == 0) ) 1164 break; 1165 } 1166 if (im4 == NULL) 1167 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED; 1168 } 1169 spin_unlock_irqrestore(&card->ipm_lock, flags); 1170} 1171 1172static struct lcs_ipm_list *lcs_check_addr_entry(struct lcs_card *card, 1173 struct ip_mc_list *im4, 1174 char *buf) 1175{ 1176 struct lcs_ipm_list *tmp, *ipm = NULL; 1177 struct list_head *l; 1178 unsigned long flags; 1179 1180 LCS_DBF_TEXT(4, trace, "chkmcent"); 1181 spin_lock_irqsave(&card->ipm_lock, flags); 1182 list_for_each(l, &card->ipm_list) { 1183 tmp = list_entry(l, struct lcs_ipm_list, list); 1184 if ( (tmp->ipm.ip_addr == im4->multiaddr) && 1185 (memcmp(buf, &tmp->ipm.mac_addr, 1186 LCS_MAC_LENGTH) == 0) ) { 1187 ipm = tmp; 1188 break; 1189 } 1190 } 1191 spin_unlock_irqrestore(&card->ipm_lock, flags); 1192 return ipm; 1193} 1194 1195static void lcs_set_mc_addresses(struct lcs_card *card, 1196 struct in_device *in4_dev) 1197{ 1198 1199 struct ip_mc_list *im4; 1200 struct lcs_ipm_list *ipm; 1201 char buf[MAX_ADDR_LEN]; 1202 unsigned long flags; 1203 1204 LCS_DBF_TEXT(4, trace, "setmclst"); 1205 for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL; 1206 im4 = rcu_dereference(im4->next_rcu)) { 1207 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev); 1208 ipm = lcs_check_addr_entry(card, im4, buf); 1209 if (ipm != NULL) 1210 continue; /* Address already in list. */ 1211 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC); 1212 if (ipm == NULL) { 1213 pr_info("Not enough memory to add" 1214 " new multicast entry!\n"); 1215 break; 1216 } 1217 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH); 1218 ipm->ipm.ip_addr = im4->multiaddr; 1219 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED; 1220 spin_lock_irqsave(&card->ipm_lock, flags); 1221 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4); 1222 list_add(&ipm->list, &card->ipm_list); 1223 spin_unlock_irqrestore(&card->ipm_lock, flags); 1224 } 1225} 1226 1227static int 1228lcs_register_mc_addresses(void *data) 1229{ 1230 struct lcs_card *card; 1231 struct in_device *in4_dev; 1232 1233 card = (struct lcs_card *) data; 1234 1235 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD)) 1236 return 0; 1237 LCS_DBF_TEXT(4, trace, "regmulti"); 1238 1239 in4_dev = in_dev_get(card->dev); 1240 if (in4_dev == NULL) 1241 goto out; 1242 rcu_read_lock(); 1243 lcs_remove_mc_addresses(card,in4_dev); 1244 lcs_set_mc_addresses(card, in4_dev); 1245 rcu_read_unlock(); 1246 in_dev_put(in4_dev); 1247 1248 netif_carrier_off(card->dev); 1249 netif_tx_disable(card->dev); 1250 wait_event(card->write.wait_q, 1251 (card->write.state != LCS_CH_STATE_RUNNING)); 1252 lcs_fix_multicast_list(card); 1253 if (card->state == DEV_STATE_UP) { 1254 netif_carrier_on(card->dev); 1255 netif_wake_queue(card->dev); 1256 } 1257out: 1258 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD); 1259 return 0; 1260} 1261#endif /* CONFIG_IP_MULTICAST */ 1262 1263/** 1264 * function called by net device to 1265 * handle multicast address relevant things 1266 */ 1267static void 1268lcs_set_multicast_list(struct net_device *dev) 1269{ 1270#ifdef CONFIG_IP_MULTICAST 1271 struct lcs_card *card; 1272 1273 LCS_DBF_TEXT(4, trace, "setmulti"); 1274 card = (struct lcs_card *) dev->ml_priv; 1275 1276 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD)) 1277 schedule_work(&card->kernel_thread_starter); 1278#endif /* CONFIG_IP_MULTICAST */ 1279} 1280 1281static long 1282lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb) 1283{ 1284 if (!IS_ERR(irb)) 1285 return 0; 1286 1287 switch (PTR_ERR(irb)) { 1288 case -EIO: 1289 dev_warn(&cdev->dev, 1290 "An I/O-error occurred on the LCS device\n"); 1291 LCS_DBF_TEXT(2, trace, "ckirberr"); 1292 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO); 1293 break; 1294 case -ETIMEDOUT: 1295 dev_warn(&cdev->dev, 1296 "A command timed out on the LCS device\n"); 1297 LCS_DBF_TEXT(2, trace, "ckirberr"); 1298 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT); 1299 break; 1300 default: 1301 dev_warn(&cdev->dev, 1302 "An error occurred on the LCS device, rc=%ld\n", 1303 PTR_ERR(irb)); 1304 LCS_DBF_TEXT(2, trace, "ckirberr"); 1305 LCS_DBF_TEXT(2, trace, " rc???"); 1306 } 1307 return PTR_ERR(irb); 1308} 1309 1310static int 1311lcs_get_problem(struct ccw_device *cdev, struct irb *irb) 1312{ 1313 int dstat, cstat; 1314 char *sense; 1315 1316 sense = (char *) irb->ecw; 1317 cstat = irb->scsw.cmd.cstat; 1318 dstat = irb->scsw.cmd.dstat; 1319 1320 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK | 1321 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK | 1322 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) { 1323 LCS_DBF_TEXT(2, trace, "CGENCHK"); 1324 return 1; 1325 } 1326 if (dstat & DEV_STAT_UNIT_CHECK) { 1327 if (sense[LCS_SENSE_BYTE_1] & 1328 LCS_SENSE_RESETTING_EVENT) { 1329 LCS_DBF_TEXT(2, trace, "REVIND"); 1330 return 1; 1331 } 1332 if (sense[LCS_SENSE_BYTE_0] & 1333 LCS_SENSE_CMD_REJECT) { 1334 LCS_DBF_TEXT(2, trace, "CMDREJ"); 1335 return 0; 1336 } 1337 if ((!sense[LCS_SENSE_BYTE_0]) && 1338 (!sense[LCS_SENSE_BYTE_1]) && 1339 (!sense[LCS_SENSE_BYTE_2]) && 1340 (!sense[LCS_SENSE_BYTE_3])) { 1341 LCS_DBF_TEXT(2, trace, "ZEROSEN"); 1342 return 0; 1343 } 1344 LCS_DBF_TEXT(2, trace, "DGENCHK"); 1345 return 1; 1346 } 1347 return 0; 1348} 1349 1350static void 1351lcs_schedule_recovery(struct lcs_card *card) 1352{ 1353 LCS_DBF_TEXT(2, trace, "startrec"); 1354 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD)) 1355 schedule_work(&card->kernel_thread_starter); 1356} 1357 1358/** 1359 * IRQ Handler for LCS channels 1360 */ 1361static void 1362lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) 1363{ 1364 struct lcs_card *card; 1365 struct lcs_channel *channel; 1366 int rc, index; 1367 int cstat, dstat; 1368 1369 if (lcs_check_irb_error(cdev, irb)) 1370 return; 1371 1372 card = CARD_FROM_DEV(cdev); 1373 if (card->read.ccwdev == cdev) 1374 channel = &card->read; 1375 else 1376 channel = &card->write; 1377 1378 cstat = irb->scsw.cmd.cstat; 1379 dstat = irb->scsw.cmd.dstat; 1380 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev)); 1381 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat, 1382 irb->scsw.cmd.dstat); 1383 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl, 1384 irb->scsw.cmd.actl); 1385 1386 /* Check for channel and device errors presented */ 1387 rc = lcs_get_problem(cdev, irb); 1388 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) { 1389 dev_warn(&cdev->dev, 1390 "The LCS device stopped because of an error," 1391 " dstat=0x%X, cstat=0x%X \n", 1392 dstat, cstat); 1393 if (rc) { 1394 channel->state = LCS_CH_STATE_ERROR; 1395 } 1396 } 1397 if (channel->state == LCS_CH_STATE_ERROR) { 1398 lcs_schedule_recovery(card); 1399 wake_up(&card->wait_q); 1400 return; 1401 } 1402 /* How far in the ccw chain have we processed? */ 1403 if ((channel->state != LCS_CH_STATE_INIT) && 1404 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) && 1405 (irb->scsw.cmd.cpa != 0)) { 1406 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa) 1407 - channel->ccws; 1408 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) || 1409 (irb->scsw.cmd.cstat & SCHN_STAT_PCI)) 1410 /* Bloody io subsystem tells us lies about cpa... */ 1411 index = (index - 1) & (LCS_NUM_BUFFS - 1); 1412 while (channel->io_idx != index) { 1413 __lcs_processed_buffer(channel, 1414 channel->iob + channel->io_idx); 1415 channel->io_idx = 1416 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1); 1417 } 1418 } 1419 1420 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) || 1421 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) || 1422 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)) 1423 /* Mark channel as stopped. */ 1424 channel->state = LCS_CH_STATE_STOPPED; 1425 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) 1426 /* CCW execution stopped on a suspend bit. */ 1427 channel->state = LCS_CH_STATE_SUSPENDED; 1428 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) { 1429 if (irb->scsw.cmd.cc != 0) { 1430 ccw_device_halt(channel->ccwdev, 0); 1431 return; 1432 } 1433 /* The channel has been stopped by halt_IO. */ 1434 channel->state = LCS_CH_STATE_HALTED; 1435 } 1436 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC) 1437 channel->state = LCS_CH_STATE_CLEARED; 1438 /* Do the rest in the tasklet. */ 1439 tasklet_schedule(&channel->irq_tasklet); 1440} 1441 1442/** 1443 * Tasklet for IRQ handler 1444 */ 1445static void 1446lcs_tasklet(unsigned long data) 1447{ 1448 unsigned long flags; 1449 struct lcs_channel *channel; 1450 struct lcs_buffer *iob; 1451 int buf_idx; 1452 1453 channel = (struct lcs_channel *) data; 1454 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev)); 1455 1456 /* Check for processed buffers. */ 1457 iob = channel->iob; 1458 buf_idx = channel->buf_idx; 1459 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) { 1460 /* Do the callback thing. */ 1461 if (iob[buf_idx].callback != NULL) 1462 iob[buf_idx].callback(channel, iob + buf_idx); 1463 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1); 1464 } 1465 channel->buf_idx = buf_idx; 1466 1467 if (channel->state == LCS_CH_STATE_STOPPED) 1468 lcs_start_channel(channel); 1469 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 1470 if (channel->state == LCS_CH_STATE_SUSPENDED && 1471 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) 1472 __lcs_resume_channel(channel); 1473 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 1474 1475 /* Something happened on the channel. Wake up waiters. */ 1476 wake_up(&channel->wait_q); 1477} 1478 1479/** 1480 * Finish current tx buffer and make it ready for transmit. 1481 */ 1482static void 1483__lcs_emit_txbuffer(struct lcs_card *card) 1484{ 1485 LCS_DBF_TEXT(5, trace, "emittx"); 1486 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0; 1487 card->tx_buffer->count += 2; 1488 lcs_ready_buffer(&card->write, card->tx_buffer); 1489 card->tx_buffer = NULL; 1490 card->tx_emitted++; 1491} 1492 1493/** 1494 * Callback for finished tx buffers. 1495 */ 1496static void 1497lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer) 1498{ 1499 struct lcs_card *card; 1500 1501 LCS_DBF_TEXT(5, trace, "txbuffcb"); 1502 /* Put buffer back to pool. */ 1503 lcs_release_buffer(channel, buffer); 1504 card = container_of(channel, struct lcs_card, write); 1505 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev)) 1506 netif_wake_queue(card->dev); 1507 spin_lock(&card->lock); 1508 card->tx_emitted--; 1509 if (card->tx_emitted <= 0 && card->tx_buffer != NULL) 1510 /* 1511 * Last running tx buffer has finished. Submit partially 1512 * filled current buffer. 1513 */ 1514 __lcs_emit_txbuffer(card); 1515 spin_unlock(&card->lock); 1516} 1517 1518/** 1519 * Packet transmit function called by network stack 1520 */ 1521static netdev_tx_t __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb, 1522 struct net_device *dev) 1523{ 1524 struct lcs_header *header; 1525 int rc = NETDEV_TX_OK; 1526 1527 LCS_DBF_TEXT(5, trace, "hardxmit"); 1528 if (skb == NULL) { 1529 card->stats.tx_dropped++; 1530 card->stats.tx_errors++; 1531 return NETDEV_TX_OK; 1532 } 1533 if (card->state != DEV_STATE_UP) { 1534 dev_kfree_skb(skb); 1535 card->stats.tx_dropped++; 1536 card->stats.tx_errors++; 1537 card->stats.tx_carrier_errors++; 1538 return NETDEV_TX_OK; 1539 } 1540 if (skb->protocol == htons(ETH_P_IPV6)) { 1541 dev_kfree_skb(skb); 1542 return NETDEV_TX_OK; 1543 } 1544 netif_stop_queue(card->dev); 1545 spin_lock(&card->lock); 1546 if (card->tx_buffer != NULL && 1547 card->tx_buffer->count + sizeof(struct lcs_header) + 1548 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE) 1549 /* skb too big for current tx buffer. */ 1550 __lcs_emit_txbuffer(card); 1551 if (card->tx_buffer == NULL) { 1552 /* Get new tx buffer */ 1553 card->tx_buffer = lcs_get_buffer(&card->write); 1554 if (card->tx_buffer == NULL) { 1555 card->stats.tx_dropped++; 1556 rc = NETDEV_TX_BUSY; 1557 goto out; 1558 } 1559 card->tx_buffer->callback = lcs_txbuffer_cb; 1560 card->tx_buffer->count = 0; 1561 } 1562 header = (struct lcs_header *) 1563 (card->tx_buffer->data + card->tx_buffer->count); 1564 card->tx_buffer->count += skb->len + sizeof(struct lcs_header); 1565 header->offset = card->tx_buffer->count; 1566 header->type = card->lan_type; 1567 header->slot = card->portno; 1568 skb_copy_from_linear_data(skb, header + 1, skb->len); 1569 spin_unlock(&card->lock); 1570 card->stats.tx_bytes += skb->len; 1571 card->stats.tx_packets++; 1572 dev_kfree_skb(skb); 1573 netif_wake_queue(card->dev); 1574 spin_lock(&card->lock); 1575 if (card->tx_emitted <= 0 && card->tx_buffer != NULL) 1576 /* If this is the first tx buffer emit it immediately. */ 1577 __lcs_emit_txbuffer(card); 1578out: 1579 spin_unlock(&card->lock); 1580 return rc; 1581} 1582 1583static netdev_tx_t lcs_start_xmit(struct sk_buff *skb, struct net_device *dev) 1584{ 1585 struct lcs_card *card; 1586 int rc; 1587 1588 LCS_DBF_TEXT(5, trace, "pktxmit"); 1589 card = (struct lcs_card *) dev->ml_priv; 1590 rc = __lcs_start_xmit(card, skb, dev); 1591 return rc; 1592} 1593 1594/** 1595 * send startlan and lanstat command to make LCS device ready 1596 */ 1597static int 1598lcs_startlan_auto(struct lcs_card *card) 1599{ 1600 int rc; 1601 1602 LCS_DBF_TEXT(2, trace, "strtauto"); 1603#ifdef CONFIG_ETHERNET 1604 card->lan_type = LCS_FRAME_TYPE_ENET; 1605 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); 1606 if (rc == 0) 1607 return 0; 1608 1609#endif 1610#ifdef CONFIG_FDDI 1611 card->lan_type = LCS_FRAME_TYPE_FDDI; 1612 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); 1613 if (rc == 0) 1614 return 0; 1615#endif 1616 return -EIO; 1617} 1618 1619static int 1620lcs_startlan(struct lcs_card *card) 1621{ 1622 int rc, i; 1623 1624 LCS_DBF_TEXT(2, trace, "startlan"); 1625 rc = 0; 1626 if (card->portno != LCS_INVALID_PORT_NO) { 1627 if (card->lan_type == LCS_FRAME_TYPE_AUTO) 1628 rc = lcs_startlan_auto(card); 1629 else 1630 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); 1631 } else { 1632 for (i = 0; i <= 16; i++) { 1633 card->portno = i; 1634 if (card->lan_type != LCS_FRAME_TYPE_AUTO) 1635 rc = lcs_send_startlan(card, 1636 LCS_INITIATOR_TCPIP); 1637 else 1638 /* autodetecting lan type */ 1639 rc = lcs_startlan_auto(card); 1640 if (rc == 0) 1641 break; 1642 } 1643 } 1644 if (rc == 0) 1645 return lcs_send_lanstat(card); 1646 return rc; 1647} 1648 1649/** 1650 * LCS detect function 1651 * setup channels and make them I/O ready 1652 */ 1653static int 1654lcs_detect(struct lcs_card *card) 1655{ 1656 int rc = 0; 1657 1658 LCS_DBF_TEXT(2, setup, "lcsdetct"); 1659 /* start/reset card */ 1660 if (card->dev) 1661 netif_stop_queue(card->dev); 1662 rc = lcs_stop_channels(card); 1663 if (rc == 0) { 1664 rc = lcs_start_channels(card); 1665 if (rc == 0) { 1666 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP); 1667 if (rc == 0) 1668 rc = lcs_startlan(card); 1669 } 1670 } 1671 if (rc == 0) { 1672 card->state = DEV_STATE_UP; 1673 } else { 1674 card->state = DEV_STATE_DOWN; 1675 card->write.state = LCS_CH_STATE_INIT; 1676 card->read.state = LCS_CH_STATE_INIT; 1677 } 1678 return rc; 1679} 1680 1681/** 1682 * LCS Stop card 1683 */ 1684static int 1685lcs_stopcard(struct lcs_card *card) 1686{ 1687 int rc; 1688 1689 LCS_DBF_TEXT(3, setup, "stopcard"); 1690 1691 if (card->read.state != LCS_CH_STATE_STOPPED && 1692 card->write.state != LCS_CH_STATE_STOPPED && 1693 card->read.state != LCS_CH_STATE_ERROR && 1694 card->write.state != LCS_CH_STATE_ERROR && 1695 card->state == DEV_STATE_UP) { 1696 lcs_clear_multicast_list(card); 1697 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP); 1698 rc = lcs_send_shutdown(card); 1699 } 1700 rc = lcs_stop_channels(card); 1701 card->state = DEV_STATE_DOWN; 1702 1703 return rc; 1704} 1705 1706/** 1707 * Kernel Thread helper functions for LGW initiated commands 1708 */ 1709static void 1710lcs_start_kernel_thread(struct work_struct *work) 1711{ 1712 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter); 1713 LCS_DBF_TEXT(5, trace, "krnthrd"); 1714 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD)) 1715 kthread_run(lcs_recovery, card, "lcs_recover"); 1716#ifdef CONFIG_IP_MULTICAST 1717 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD)) 1718 kthread_run(lcs_register_mc_addresses, card, "regipm"); 1719#endif 1720} 1721 1722/** 1723 * Process control frames. 1724 */ 1725static void 1726lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd) 1727{ 1728 LCS_DBF_TEXT(5, trace, "getctrl"); 1729 if (cmd->initiator == LCS_INITIATOR_LGW) { 1730 switch(cmd->cmd_code) { 1731 case LCS_CMD_STARTUP: 1732 case LCS_CMD_STARTLAN: 1733 lcs_schedule_recovery(card); 1734 break; 1735 case LCS_CMD_STOPLAN: 1736 if (card->dev) { 1737 pr_warn("Stoplan for %s initiated by LGW\n", 1738 card->dev->name); 1739 netif_carrier_off(card->dev); 1740 } 1741 break; 1742 default: 1743 LCS_DBF_TEXT(5, trace, "noLGWcmd"); 1744 break; 1745 } 1746 } else 1747 lcs_notify_lancmd_waiters(card, cmd); 1748} 1749 1750/** 1751 * Unpack network packet. 1752 */ 1753static void 1754lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len) 1755{ 1756 struct sk_buff *skb; 1757 1758 LCS_DBF_TEXT(5, trace, "getskb"); 1759 if (card->dev == NULL || 1760 card->state != DEV_STATE_UP) 1761 /* The card isn't up. Ignore the packet. */ 1762 return; 1763 1764 skb = dev_alloc_skb(skb_len); 1765 if (skb == NULL) { 1766 dev_err(&card->dev->dev, 1767 " Allocating a socket buffer to interface %s failed\n", 1768 card->dev->name); 1769 card->stats.rx_dropped++; 1770 return; 1771 } 1772 skb_put_data(skb, skb_data, skb_len); 1773 skb->protocol = card->lan_type_trans(skb, card->dev); 1774 card->stats.rx_bytes += skb_len; 1775 card->stats.rx_packets++; 1776 if (skb->protocol == htons(ETH_P_802_2)) 1777 *((__u32 *)skb->cb) = ++card->pkt_seq; 1778 netif_rx(skb); 1779} 1780 1781/** 1782 * LCS main routine to get packets and lancmd replies from the buffers 1783 */ 1784static void 1785lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer) 1786{ 1787 struct lcs_card *card; 1788 struct lcs_header *lcs_hdr; 1789 __u16 offset; 1790 1791 LCS_DBF_TEXT(5, trace, "lcsgtpkt"); 1792 lcs_hdr = (struct lcs_header *) buffer->data; 1793 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) { 1794 LCS_DBF_TEXT(4, trace, "-eiogpkt"); 1795 return; 1796 } 1797 card = container_of(channel, struct lcs_card, read); 1798 offset = 0; 1799 while (lcs_hdr->offset != 0) { 1800 if (lcs_hdr->offset <= 0 || 1801 lcs_hdr->offset > LCS_IOBUFFERSIZE || 1802 lcs_hdr->offset < offset) { 1803 /* Offset invalid. */ 1804 card->stats.rx_length_errors++; 1805 card->stats.rx_errors++; 1806 return; 1807 } 1808 /* What kind of frame is it? */ 1809 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL) 1810 /* Control frame. */ 1811 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr); 1812 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET || 1813 lcs_hdr->type == LCS_FRAME_TYPE_TR || 1814 lcs_hdr->type == LCS_FRAME_TYPE_FDDI) 1815 /* Normal network packet. */ 1816 lcs_get_skb(card, (char *)(lcs_hdr + 1), 1817 lcs_hdr->offset - offset - 1818 sizeof(struct lcs_header)); 1819 else 1820 /* Unknown frame type. */ 1821 ; // FIXME: error message ? 1822 /* Proceed to next frame. */ 1823 offset = lcs_hdr->offset; 1824 lcs_hdr->offset = LCS_ILLEGAL_OFFSET; 1825 lcs_hdr = (struct lcs_header *) (buffer->data + offset); 1826 } 1827 /* The buffer is now empty. Make it ready again. */ 1828 lcs_ready_buffer(&card->read, buffer); 1829} 1830 1831/** 1832 * get network statistics for ifconfig and other user programs 1833 */ 1834static struct net_device_stats * 1835lcs_getstats(struct net_device *dev) 1836{ 1837 struct lcs_card *card; 1838 1839 LCS_DBF_TEXT(4, trace, "netstats"); 1840 card = (struct lcs_card *) dev->ml_priv; 1841 return &card->stats; 1842} 1843 1844/** 1845 * stop lcs device 1846 * This function will be called by user doing ifconfig xxx down 1847 */ 1848static int 1849lcs_stop_device(struct net_device *dev) 1850{ 1851 struct lcs_card *card; 1852 int rc; 1853 1854 LCS_DBF_TEXT(2, trace, "stopdev"); 1855 card = (struct lcs_card *) dev->ml_priv; 1856 netif_carrier_off(dev); 1857 netif_tx_disable(dev); 1858 dev->flags &= ~IFF_UP; 1859 wait_event(card->write.wait_q, 1860 (card->write.state != LCS_CH_STATE_RUNNING)); 1861 rc = lcs_stopcard(card); 1862 if (rc) 1863 dev_err(&card->dev->dev, 1864 " Shutting down the LCS device failed\n"); 1865 return rc; 1866} 1867 1868/** 1869 * start lcs device and make it runnable 1870 * This function will be called by user doing ifconfig xxx up 1871 */ 1872static int 1873lcs_open_device(struct net_device *dev) 1874{ 1875 struct lcs_card *card; 1876 int rc; 1877 1878 LCS_DBF_TEXT(2, trace, "opendev"); 1879 card = (struct lcs_card *) dev->ml_priv; 1880 /* initialize statistics */ 1881 rc = lcs_detect(card); 1882 if (rc) { 1883 pr_err("Error in opening device!\n"); 1884 1885 } else { 1886 dev->flags |= IFF_UP; 1887 netif_carrier_on(dev); 1888 netif_wake_queue(dev); 1889 card->state = DEV_STATE_UP; 1890 } 1891 return rc; 1892} 1893 1894/** 1895 * show function for portno called by cat or similar things 1896 */ 1897static ssize_t 1898lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf) 1899{ 1900 struct lcs_card *card; 1901 1902 card = dev_get_drvdata(dev); 1903 1904 if (!card) 1905 return 0; 1906 1907 return sprintf(buf, "%d\n", card->portno); 1908} 1909 1910/** 1911 * store the value which is piped to file portno 1912 */ 1913static ssize_t 1914lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 1915{ 1916 struct lcs_card *card; 1917 int rc; 1918 s16 value; 1919 1920 card = dev_get_drvdata(dev); 1921 1922 if (!card) 1923 return 0; 1924 1925 rc = kstrtos16(buf, 0, &value); 1926 if (rc) 1927 return -EINVAL; 1928 /* TODO: sanity checks */ 1929 card->portno = value; 1930 if (card->dev) 1931 card->dev->dev_port = card->portno; 1932 1933 return count; 1934 1935} 1936 1937static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store); 1938 1939static const char *lcs_type[] = { 1940 "not a channel", 1941 "2216 parallel", 1942 "2216 channel", 1943 "OSA LCS card", 1944 "unknown channel type", 1945 "unsupported channel type", 1946}; 1947 1948static ssize_t 1949lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf) 1950{ 1951 struct ccwgroup_device *cgdev; 1952 1953 cgdev = to_ccwgroupdev(dev); 1954 if (!cgdev) 1955 return -ENODEV; 1956 1957 return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]); 1958} 1959 1960static DEVICE_ATTR(type, 0444, lcs_type_show, NULL); 1961 1962static ssize_t 1963lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf) 1964{ 1965 struct lcs_card *card; 1966 1967 card = dev_get_drvdata(dev); 1968 1969 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0; 1970} 1971 1972static ssize_t 1973lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 1974{ 1975 struct lcs_card *card; 1976 unsigned int value; 1977 int rc; 1978 1979 card = dev_get_drvdata(dev); 1980 1981 if (!card) 1982 return 0; 1983 1984 rc = kstrtouint(buf, 0, &value); 1985 if (rc) 1986 return -EINVAL; 1987 /* TODO: sanity checks */ 1988 card->lancmd_timeout = value; 1989 1990 return count; 1991 1992} 1993 1994static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store); 1995 1996static ssize_t 1997lcs_dev_recover_store(struct device *dev, struct device_attribute *attr, 1998 const char *buf, size_t count) 1999{ 2000 struct lcs_card *card = dev_get_drvdata(dev); 2001 char *tmp; 2002 int i; 2003 2004 if (!card) 2005 return -EINVAL; 2006 if (card->state != DEV_STATE_UP) 2007 return -EPERM; 2008 i = simple_strtoul(buf, &tmp, 16); 2009 if (i == 1) 2010 lcs_schedule_recovery(card); 2011 return count; 2012} 2013 2014static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store); 2015 2016static struct attribute * lcs_attrs[] = { 2017 &dev_attr_portno.attr, 2018 &dev_attr_type.attr, 2019 &dev_attr_lancmd_timeout.attr, 2020 &dev_attr_recover.attr, 2021 NULL, 2022}; 2023static struct attribute_group lcs_attr_group = { 2024 .attrs = lcs_attrs, 2025}; 2026static const struct attribute_group *lcs_attr_groups[] = { 2027 &lcs_attr_group, 2028 NULL, 2029}; 2030static const struct device_type lcs_devtype = { 2031 .name = "lcs", 2032 .groups = lcs_attr_groups, 2033}; 2034 2035/** 2036 * lcs_probe_device is called on establishing a new ccwgroup_device. 2037 */ 2038static int 2039lcs_probe_device(struct ccwgroup_device *ccwgdev) 2040{ 2041 struct lcs_card *card; 2042 2043 if (!get_device(&ccwgdev->dev)) 2044 return -ENODEV; 2045 2046 LCS_DBF_TEXT(2, setup, "add_dev"); 2047 card = lcs_alloc_card(); 2048 if (!card) { 2049 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM); 2050 put_device(&ccwgdev->dev); 2051 return -ENOMEM; 2052 } 2053 dev_set_drvdata(&ccwgdev->dev, card); 2054 ccwgdev->cdev[0]->handler = lcs_irq; 2055 ccwgdev->cdev[1]->handler = lcs_irq; 2056 card->gdev = ccwgdev; 2057 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread); 2058 card->thread_start_mask = 0; 2059 card->thread_allowed_mask = 0; 2060 card->thread_running_mask = 0; 2061 ccwgdev->dev.type = &lcs_devtype; 2062 2063 return 0; 2064} 2065 2066static int 2067lcs_register_netdev(struct ccwgroup_device *ccwgdev) 2068{ 2069 struct lcs_card *card; 2070 2071 LCS_DBF_TEXT(2, setup, "regnetdv"); 2072 card = dev_get_drvdata(&ccwgdev->dev); 2073 if (card->dev->reg_state != NETREG_UNINITIALIZED) 2074 return 0; 2075 SET_NETDEV_DEV(card->dev, &ccwgdev->dev); 2076 return register_netdev(card->dev); 2077} 2078 2079/** 2080 * lcs_new_device will be called by setting the group device online. 2081 */ 2082static const struct net_device_ops lcs_netdev_ops = { 2083 .ndo_open = lcs_open_device, 2084 .ndo_stop = lcs_stop_device, 2085 .ndo_get_stats = lcs_getstats, 2086 .ndo_start_xmit = lcs_start_xmit, 2087}; 2088 2089static const struct net_device_ops lcs_mc_netdev_ops = { 2090 .ndo_open = lcs_open_device, 2091 .ndo_stop = lcs_stop_device, 2092 .ndo_get_stats = lcs_getstats, 2093 .ndo_start_xmit = lcs_start_xmit, 2094 .ndo_set_rx_mode = lcs_set_multicast_list, 2095}; 2096 2097static int 2098lcs_new_device(struct ccwgroup_device *ccwgdev) 2099{ 2100 struct lcs_card *card; 2101 struct net_device *dev=NULL; 2102 enum lcs_dev_states recover_state; 2103 int rc; 2104 2105 card = dev_get_drvdata(&ccwgdev->dev); 2106 if (!card) 2107 return -ENODEV; 2108 2109 LCS_DBF_TEXT(2, setup, "newdev"); 2110 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2111 card->read.ccwdev = ccwgdev->cdev[0]; 2112 card->write.ccwdev = ccwgdev->cdev[1]; 2113 2114 recover_state = card->state; 2115 rc = ccw_device_set_online(card->read.ccwdev); 2116 if (rc) 2117 goto out_err; 2118 rc = ccw_device_set_online(card->write.ccwdev); 2119 if (rc) 2120 goto out_werr; 2121 2122 LCS_DBF_TEXT(3, setup, "lcsnewdv"); 2123 2124 lcs_setup_card(card); 2125 rc = lcs_detect(card); 2126 if (rc) { 2127 LCS_DBF_TEXT(2, setup, "dtctfail"); 2128 dev_err(&ccwgdev->dev, 2129 "Detecting a network adapter for LCS devices" 2130 " failed with rc=%d (0x%x)\n", rc, rc); 2131 lcs_stopcard(card); 2132 goto out; 2133 } 2134 if (card->dev) { 2135 LCS_DBF_TEXT(2, setup, "samedev"); 2136 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2137 goto netdev_out; 2138 } 2139 switch (card->lan_type) { 2140#ifdef CONFIG_ETHERNET 2141 case LCS_FRAME_TYPE_ENET: 2142 card->lan_type_trans = eth_type_trans; 2143 dev = alloc_etherdev(0); 2144 break; 2145#endif 2146#ifdef CONFIG_FDDI 2147 case LCS_FRAME_TYPE_FDDI: 2148 card->lan_type_trans = fddi_type_trans; 2149 dev = alloc_fddidev(0); 2150 break; 2151#endif 2152 default: 2153 LCS_DBF_TEXT(3, setup, "errinit"); 2154 pr_err(" Initialization failed\n"); 2155 goto out; 2156 } 2157 if (!dev) 2158 goto out; 2159 card->dev = dev; 2160 card->dev->ml_priv = card; 2161 card->dev->netdev_ops = &lcs_netdev_ops; 2162 card->dev->dev_port = card->portno; 2163 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH); 2164#ifdef CONFIG_IP_MULTICAST 2165 if (!lcs_check_multicast_support(card)) 2166 card->dev->netdev_ops = &lcs_mc_netdev_ops; 2167#endif 2168netdev_out: 2169 lcs_set_allowed_threads(card,0xffffffff); 2170 if (recover_state == DEV_STATE_RECOVER) { 2171 lcs_set_multicast_list(card->dev); 2172 card->dev->flags |= IFF_UP; 2173 netif_carrier_on(card->dev); 2174 netif_wake_queue(card->dev); 2175 card->state = DEV_STATE_UP; 2176 } else { 2177 lcs_stopcard(card); 2178 } 2179 2180 if (lcs_register_netdev(ccwgdev) != 0) 2181 goto out; 2182 2183 /* Print out supported assists: IPv6 */ 2184 pr_info("LCS device %s %s IPv6 support\n", card->dev->name, 2185 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ? 2186 "with" : "without"); 2187 /* Print out supported assist: Multicast */ 2188 pr_info("LCS device %s %s Multicast support\n", card->dev->name, 2189 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ? 2190 "with" : "without"); 2191 return 0; 2192out: 2193 2194 ccw_device_set_offline(card->write.ccwdev); 2195out_werr: 2196 ccw_device_set_offline(card->read.ccwdev); 2197out_err: 2198 return -ENODEV; 2199} 2200 2201/** 2202 * lcs_shutdown_device, called when setting the group device offline. 2203 */ 2204static int 2205__lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode) 2206{ 2207 struct lcs_card *card; 2208 enum lcs_dev_states recover_state; 2209 int ret = 0, ret2 = 0, ret3 = 0; 2210 2211 LCS_DBF_TEXT(3, setup, "shtdndev"); 2212 card = dev_get_drvdata(&ccwgdev->dev); 2213 if (!card) 2214 return -ENODEV; 2215 if (recovery_mode == 0) { 2216 lcs_set_allowed_threads(card, 0); 2217 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD)) 2218 return -ERESTARTSYS; 2219 } 2220 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2221 recover_state = card->state; 2222 2223 ret = lcs_stop_device(card->dev); 2224 ret2 = ccw_device_set_offline(card->read.ccwdev); 2225 ret3 = ccw_device_set_offline(card->write.ccwdev); 2226 if (!ret) 2227 ret = (ret2) ? ret2 : ret3; 2228 if (ret) 2229 LCS_DBF_TEXT_(3, setup, "1err:%d", ret); 2230 if (recover_state == DEV_STATE_UP) { 2231 card->state = DEV_STATE_RECOVER; 2232 } 2233 return 0; 2234} 2235 2236static int 2237lcs_shutdown_device(struct ccwgroup_device *ccwgdev) 2238{ 2239 return __lcs_shutdown_device(ccwgdev, 0); 2240} 2241 2242/** 2243 * drive lcs recovery after startup and startlan initiated by Lan Gateway 2244 */ 2245static int 2246lcs_recovery(void *ptr) 2247{ 2248 struct lcs_card *card; 2249 struct ccwgroup_device *gdev; 2250 int rc; 2251 2252 card = (struct lcs_card *) ptr; 2253 2254 LCS_DBF_TEXT(4, trace, "recover1"); 2255 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD)) 2256 return 0; 2257 LCS_DBF_TEXT(4, trace, "recover2"); 2258 gdev = card->gdev; 2259 dev_warn(&gdev->dev, 2260 "A recovery process has been started for the LCS device\n"); 2261 rc = __lcs_shutdown_device(gdev, 1); 2262 rc = lcs_new_device(gdev); 2263 if (!rc) 2264 pr_info("Device %s successfully recovered!\n", 2265 card->dev->name); 2266 else 2267 pr_info("Device %s could not be recovered!\n", 2268 card->dev->name); 2269 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD); 2270 return 0; 2271} 2272 2273/** 2274 * lcs_remove_device, free buffers and card 2275 */ 2276static void 2277lcs_remove_device(struct ccwgroup_device *ccwgdev) 2278{ 2279 struct lcs_card *card; 2280 2281 card = dev_get_drvdata(&ccwgdev->dev); 2282 if (!card) 2283 return; 2284 2285 LCS_DBF_TEXT(3, setup, "remdev"); 2286 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2287 if (ccwgdev->state == CCWGROUP_ONLINE) { 2288 lcs_shutdown_device(ccwgdev); 2289 } 2290 if (card->dev) 2291 unregister_netdev(card->dev); 2292 lcs_cleanup_card(card); 2293 lcs_free_card(card); 2294 dev_set_drvdata(&ccwgdev->dev, NULL); 2295 put_device(&ccwgdev->dev); 2296} 2297 2298static struct ccw_device_id lcs_ids[] = { 2299 {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel}, 2300 {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216}, 2301 {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2}, 2302 {}, 2303}; 2304MODULE_DEVICE_TABLE(ccw, lcs_ids); 2305 2306static struct ccw_driver lcs_ccw_driver = { 2307 .driver = { 2308 .owner = THIS_MODULE, 2309 .name = "lcs", 2310 }, 2311 .ids = lcs_ids, 2312 .probe = ccwgroup_probe_ccwdev, 2313 .remove = ccwgroup_remove_ccwdev, 2314 .int_class = IRQIO_LCS, 2315}; 2316 2317/** 2318 * LCS ccwgroup driver registration 2319 */ 2320static struct ccwgroup_driver lcs_group_driver = { 2321 .driver = { 2322 .owner = THIS_MODULE, 2323 .name = "lcs", 2324 }, 2325 .ccw_driver = &lcs_ccw_driver, 2326 .setup = lcs_probe_device, 2327 .remove = lcs_remove_device, 2328 .set_online = lcs_new_device, 2329 .set_offline = lcs_shutdown_device, 2330}; 2331 2332static ssize_t group_store(struct device_driver *ddrv, const char *buf, 2333 size_t count) 2334{ 2335 int err; 2336 err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf); 2337 return err ? err : count; 2338} 2339static DRIVER_ATTR_WO(group); 2340 2341static struct attribute *lcs_drv_attrs[] = { 2342 &driver_attr_group.attr, 2343 NULL, 2344}; 2345static struct attribute_group lcs_drv_attr_group = { 2346 .attrs = lcs_drv_attrs, 2347}; 2348static const struct attribute_group *lcs_drv_attr_groups[] = { 2349 &lcs_drv_attr_group, 2350 NULL, 2351}; 2352 2353/** 2354 * LCS Module/Kernel initialization function 2355 */ 2356static int 2357__init lcs_init_module(void) 2358{ 2359 int rc; 2360 2361 pr_info("Loading %s\n", version); 2362 rc = lcs_register_debug_facility(); 2363 LCS_DBF_TEXT(0, setup, "lcsinit"); 2364 if (rc) 2365 goto out_err; 2366 lcs_root_dev = root_device_register("lcs"); 2367 rc = PTR_ERR_OR_ZERO(lcs_root_dev); 2368 if (rc) 2369 goto register_err; 2370 rc = ccw_driver_register(&lcs_ccw_driver); 2371 if (rc) 2372 goto ccw_err; 2373 lcs_group_driver.driver.groups = lcs_drv_attr_groups; 2374 rc = ccwgroup_driver_register(&lcs_group_driver); 2375 if (rc) 2376 goto ccwgroup_err; 2377 return 0; 2378 2379ccwgroup_err: 2380 ccw_driver_unregister(&lcs_ccw_driver); 2381ccw_err: 2382 root_device_unregister(lcs_root_dev); 2383register_err: 2384 lcs_unregister_debug_facility(); 2385out_err: 2386 pr_err("Initializing the lcs device driver failed\n"); 2387 return rc; 2388} 2389 2390 2391/** 2392 * LCS module cleanup function 2393 */ 2394static void 2395__exit lcs_cleanup_module(void) 2396{ 2397 pr_info("Terminating lcs module.\n"); 2398 LCS_DBF_TEXT(0, trace, "cleanup"); 2399 ccwgroup_driver_unregister(&lcs_group_driver); 2400 ccw_driver_unregister(&lcs_ccw_driver); 2401 root_device_unregister(lcs_root_dev); 2402 lcs_unregister_debug_facility(); 2403} 2404 2405module_init(lcs_init_module); 2406module_exit(lcs_cleanup_module); 2407 2408MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>"); 2409MODULE_LICENSE("GPL"); 2410 2411