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 47 static char version[] __initdata = "LCS driver"; 48 49 /** 50 * the root device for lcs group devices 51 */ 52 static struct device *lcs_root_dev; 53 54 /** 55 * Some prototypes. 56 */ 57 static void lcs_tasklet(unsigned long); 58 static void lcs_start_kernel_thread(struct work_struct *); 59 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *); 60 #ifdef CONFIG_IP_MULTICAST 61 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *); 62 #endif /* CONFIG_IP_MULTICAST */ 63 static int lcs_recovery(void *ptr); 64 65 /** 66 * Debug Facility Stuff 67 */ 68 static char debug_buffer[255]; 69 static debug_info_t *lcs_dbf_setup; 70 static debug_info_t *lcs_dbf_trace; 71 72 /** 73 * LCS Debug Facility functions 74 */ 75 static void 76 lcs_unregister_debug_facility(void) 77 { 78 debug_unregister(lcs_dbf_setup); 79 debug_unregister(lcs_dbf_trace); 80 } 81 82 static int 83 lcs_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 */ 102 static int 103 lcs_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 */ 129 static void 130 lcs_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 */ 144 static void 145 lcs_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 */ 157 static void 158 lcs_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 */ 168 static struct lcs_card * 169 lcs_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 */ 208 static void 209 lcs_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 } 246 247 static void 248 lcs_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 */ 263 static void 264 lcs_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 } 293 294 static void 295 lcs_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 } 306 307 static void 308 lcs_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 } 317 static 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 } 327 328 static int 329 lcs_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 } 334 335 static 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 } 349 350 static void 351 lcs_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 } 360 361 static 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 } 379 380 static int 381 lcs_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 } 388 389 static int 390 lcs_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 */ 408 static void 409 lcs_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 } 430 431 static 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 */ 457 static void 458 lcs_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 */ 474 static int 475 lcs_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 } 497 498 static int 499 lcs_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, (addr_t) channel); 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 */ 523 static int 524 lcs_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, (addr_t) channel); 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 */ 551 static int 552 lcs_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 */ 571 static int 572 lcs_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 */ 583 static 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 } 599 600 static struct lcs_buffer * 601 lcs_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 */ 616 static 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 */ 642 static 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 } 659 660 static int 661 lcs_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 */ 686 static 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 */ 718 static void 719 lcs_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 */ 734 static struct lcs_buffer * 735 lcs_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 } 754 755 756 static void 757 lcs_get_reply(struct lcs_reply *reply) 758 { 759 WARN_ON(atomic_read(&reply->refcnt) <= 0); 760 atomic_inc(&reply->refcnt); 761 } 762 763 static void 764 lcs_put_reply(struct lcs_reply *reply) 765 { 766 WARN_ON(atomic_read(&reply->refcnt) <= 0); 767 if (atomic_dec_and_test(&reply->refcnt)) { 768 kfree(reply); 769 } 770 771 } 772 773 static struct lcs_reply * 774 lcs_alloc_reply(struct lcs_cmd *cmd) 775 { 776 struct lcs_reply *reply; 777 778 LCS_DBF_TEXT(4, trace, "getreply"); 779 780 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC); 781 if (!reply) 782 return NULL; 783 atomic_set(&reply->refcnt,1); 784 reply->sequence_no = cmd->sequence_no; 785 reply->received = 0; 786 reply->rc = 0; 787 init_waitqueue_head(&reply->wait_q); 788 789 return reply; 790 } 791 792 /** 793 * Notifier function for lancmd replies. Called from read irq. 794 */ 795 static void 796 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd) 797 { 798 struct list_head *l, *n; 799 struct lcs_reply *reply; 800 801 LCS_DBF_TEXT(4, trace, "notiwait"); 802 spin_lock(&card->lock); 803 list_for_each_safe(l, n, &card->lancmd_waiters) { 804 reply = list_entry(l, struct lcs_reply, list); 805 if (reply->sequence_no == cmd->sequence_no) { 806 lcs_get_reply(reply); 807 list_del_init(&reply->list); 808 if (reply->callback != NULL) 809 reply->callback(card, cmd); 810 reply->received = 1; 811 reply->rc = cmd->return_code; 812 wake_up(&reply->wait_q); 813 lcs_put_reply(reply); 814 break; 815 } 816 } 817 spin_unlock(&card->lock); 818 } 819 820 /** 821 * Emit buffer of a lan command. 822 */ 823 static void 824 lcs_lancmd_timeout(struct timer_list *t) 825 { 826 struct lcs_reply *reply = from_timer(reply, t, timer); 827 struct lcs_reply *list_reply, *r; 828 unsigned long flags; 829 830 LCS_DBF_TEXT(4, trace, "timeout"); 831 spin_lock_irqsave(&reply->card->lock, flags); 832 list_for_each_entry_safe(list_reply, r, 833 &reply->card->lancmd_waiters,list) { 834 if (reply == list_reply) { 835 lcs_get_reply(reply); 836 list_del_init(&reply->list); 837 spin_unlock_irqrestore(&reply->card->lock, flags); 838 reply->received = 1; 839 reply->rc = -ETIME; 840 wake_up(&reply->wait_q); 841 lcs_put_reply(reply); 842 return; 843 } 844 } 845 spin_unlock_irqrestore(&reply->card->lock, flags); 846 } 847 848 static int 849 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer, 850 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *)) 851 { 852 struct lcs_reply *reply; 853 struct lcs_cmd *cmd; 854 unsigned long flags; 855 int rc; 856 857 LCS_DBF_TEXT(4, trace, "sendcmd"); 858 cmd = (struct lcs_cmd *) buffer->data; 859 cmd->return_code = 0; 860 cmd->sequence_no = card->sequence_no++; 861 reply = lcs_alloc_reply(cmd); 862 if (!reply) 863 return -ENOMEM; 864 reply->callback = reply_callback; 865 reply->card = card; 866 spin_lock_irqsave(&card->lock, flags); 867 list_add_tail(&reply->list, &card->lancmd_waiters); 868 spin_unlock_irqrestore(&card->lock, flags); 869 870 buffer->callback = lcs_release_buffer; 871 rc = lcs_ready_buffer(&card->write, buffer); 872 if (rc) 873 return rc; 874 timer_setup(&reply->timer, lcs_lancmd_timeout, 0); 875 mod_timer(&reply->timer, jiffies + HZ * card->lancmd_timeout); 876 wait_event(reply->wait_q, reply->received); 877 del_timer_sync(&reply->timer); 878 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc); 879 rc = reply->rc; 880 lcs_put_reply(reply); 881 return rc ? -EIO : 0; 882 } 883 884 /** 885 * LCS startup command 886 */ 887 static int 888 lcs_send_startup(struct lcs_card *card, __u8 initiator) 889 { 890 struct lcs_buffer *buffer; 891 struct lcs_cmd *cmd; 892 893 LCS_DBF_TEXT(2, trace, "startup"); 894 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 895 cmd = (struct lcs_cmd *) buffer->data; 896 cmd->cmd_code = LCS_CMD_STARTUP; 897 cmd->initiator = initiator; 898 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE; 899 return lcs_send_lancmd(card, buffer, NULL); 900 } 901 902 /** 903 * LCS shutdown command 904 */ 905 static int 906 lcs_send_shutdown(struct lcs_card *card) 907 { 908 struct lcs_buffer *buffer; 909 struct lcs_cmd *cmd; 910 911 LCS_DBF_TEXT(2, trace, "shutdown"); 912 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 913 cmd = (struct lcs_cmd *) buffer->data; 914 cmd->cmd_code = LCS_CMD_SHUTDOWN; 915 cmd->initiator = LCS_INITIATOR_TCPIP; 916 return lcs_send_lancmd(card, buffer, NULL); 917 } 918 919 /** 920 * LCS lanstat command 921 */ 922 static void 923 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd) 924 { 925 LCS_DBF_TEXT(2, trace, "statcb"); 926 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH); 927 } 928 929 static int 930 lcs_send_lanstat(struct lcs_card *card) 931 { 932 struct lcs_buffer *buffer; 933 struct lcs_cmd *cmd; 934 935 LCS_DBF_TEXT(2,trace, "cmdstat"); 936 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 937 cmd = (struct lcs_cmd *) buffer->data; 938 /* Setup lanstat command. */ 939 cmd->cmd_code = LCS_CMD_LANSTAT; 940 cmd->initiator = LCS_INITIATOR_TCPIP; 941 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type; 942 cmd->cmd.lcs_std_cmd.portno = card->portno; 943 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb); 944 } 945 946 /** 947 * send stoplan command 948 */ 949 static int 950 lcs_send_stoplan(struct lcs_card *card, __u8 initiator) 951 { 952 struct lcs_buffer *buffer; 953 struct lcs_cmd *cmd; 954 955 LCS_DBF_TEXT(2, trace, "cmdstpln"); 956 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 957 cmd = (struct lcs_cmd *) buffer->data; 958 cmd->cmd_code = LCS_CMD_STOPLAN; 959 cmd->initiator = initiator; 960 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type; 961 cmd->cmd.lcs_std_cmd.portno = card->portno; 962 return lcs_send_lancmd(card, buffer, NULL); 963 } 964 965 /** 966 * send startlan command 967 */ 968 static void 969 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd) 970 { 971 LCS_DBF_TEXT(2, trace, "srtlancb"); 972 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type; 973 card->portno = cmd->cmd.lcs_std_cmd.portno; 974 } 975 976 static int 977 lcs_send_startlan(struct lcs_card *card, __u8 initiator) 978 { 979 struct lcs_buffer *buffer; 980 struct lcs_cmd *cmd; 981 982 LCS_DBF_TEXT(2, trace, "cmdstaln"); 983 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 984 cmd = (struct lcs_cmd *) buffer->data; 985 cmd->cmd_code = LCS_CMD_STARTLAN; 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, __lcs_send_startlan_cb); 990 } 991 992 #ifdef CONFIG_IP_MULTICAST 993 /** 994 * send setipm command (Multicast) 995 */ 996 static int 997 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list) 998 { 999 struct lcs_buffer *buffer; 1000 struct lcs_cmd *cmd; 1001 1002 LCS_DBF_TEXT(2, trace, "cmdsetim"); 1003 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE); 1004 cmd = (struct lcs_cmd *) buffer->data; 1005 cmd->cmd_code = LCS_CMD_SETIPM; 1006 cmd->initiator = LCS_INITIATOR_TCPIP; 1007 cmd->cmd.lcs_qipassist.lan_type = card->lan_type; 1008 cmd->cmd.lcs_qipassist.portno = card->portno; 1009 cmd->cmd.lcs_qipassist.version = 4; 1010 cmd->cmd.lcs_qipassist.num_ip_pairs = 1; 1011 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair, 1012 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair)); 1013 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr); 1014 return lcs_send_lancmd(card, buffer, NULL); 1015 } 1016 1017 /** 1018 * send delipm command (Multicast) 1019 */ 1020 static int 1021 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list) 1022 { 1023 struct lcs_buffer *buffer; 1024 struct lcs_cmd *cmd; 1025 1026 LCS_DBF_TEXT(2, trace, "cmddelim"); 1027 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE); 1028 cmd = (struct lcs_cmd *) buffer->data; 1029 cmd->cmd_code = LCS_CMD_DELIPM; 1030 cmd->initiator = LCS_INITIATOR_TCPIP; 1031 cmd->cmd.lcs_qipassist.lan_type = card->lan_type; 1032 cmd->cmd.lcs_qipassist.portno = card->portno; 1033 cmd->cmd.lcs_qipassist.version = 4; 1034 cmd->cmd.lcs_qipassist.num_ip_pairs = 1; 1035 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair, 1036 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair)); 1037 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr); 1038 return lcs_send_lancmd(card, buffer, NULL); 1039 } 1040 1041 /** 1042 * check if multicast is supported by LCS 1043 */ 1044 static void 1045 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd) 1046 { 1047 LCS_DBF_TEXT(2, trace, "chkmccb"); 1048 card->ip_assists_supported = 1049 cmd->cmd.lcs_qipassist.ip_assists_supported; 1050 card->ip_assists_enabled = 1051 cmd->cmd.lcs_qipassist.ip_assists_enabled; 1052 } 1053 1054 static int 1055 lcs_check_multicast_support(struct lcs_card *card) 1056 { 1057 struct lcs_buffer *buffer; 1058 struct lcs_cmd *cmd; 1059 int rc; 1060 1061 LCS_DBF_TEXT(2, trace, "cmdqipa"); 1062 /* Send query ipassist. */ 1063 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 1064 cmd = (struct lcs_cmd *) buffer->data; 1065 cmd->cmd_code = LCS_CMD_QIPASSIST; 1066 cmd->initiator = LCS_INITIATOR_TCPIP; 1067 cmd->cmd.lcs_qipassist.lan_type = card->lan_type; 1068 cmd->cmd.lcs_qipassist.portno = card->portno; 1069 cmd->cmd.lcs_qipassist.version = 4; 1070 cmd->cmd.lcs_qipassist.num_ip_pairs = 1; 1071 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb); 1072 if (rc != 0) { 1073 pr_err("Query IPAssist failed. Assuming unsupported!\n"); 1074 return -EOPNOTSUPP; 1075 } 1076 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) 1077 return 0; 1078 return -EOPNOTSUPP; 1079 } 1080 1081 /** 1082 * set or del multicast address on LCS card 1083 */ 1084 static void 1085 lcs_fix_multicast_list(struct lcs_card *card) 1086 { 1087 struct list_head failed_list; 1088 struct lcs_ipm_list *ipm, *tmp; 1089 unsigned long flags; 1090 int rc; 1091 1092 LCS_DBF_TEXT(4,trace, "fixipm"); 1093 INIT_LIST_HEAD(&failed_list); 1094 spin_lock_irqsave(&card->ipm_lock, flags); 1095 list_modified: 1096 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){ 1097 switch (ipm->ipm_state) { 1098 case LCS_IPM_STATE_SET_REQUIRED: 1099 /* del from ipm_list so no one else can tamper with 1100 * this entry */ 1101 list_del_init(&ipm->list); 1102 spin_unlock_irqrestore(&card->ipm_lock, flags); 1103 rc = lcs_send_setipm(card, ipm); 1104 spin_lock_irqsave(&card->ipm_lock, flags); 1105 if (rc) { 1106 pr_info("Adding multicast address failed." 1107 " Table possibly full!\n"); 1108 /* store ipm in failed list -> will be added 1109 * to ipm_list again, so a retry will be done 1110 * during the next call of this function */ 1111 list_add_tail(&ipm->list, &failed_list); 1112 } else { 1113 ipm->ipm_state = LCS_IPM_STATE_ON_CARD; 1114 /* re-insert into ipm_list */ 1115 list_add_tail(&ipm->list, &card->ipm_list); 1116 } 1117 goto list_modified; 1118 case LCS_IPM_STATE_DEL_REQUIRED: 1119 list_del(&ipm->list); 1120 spin_unlock_irqrestore(&card->ipm_lock, flags); 1121 lcs_send_delipm(card, ipm); 1122 spin_lock_irqsave(&card->ipm_lock, flags); 1123 kfree(ipm); 1124 goto list_modified; 1125 case LCS_IPM_STATE_ON_CARD: 1126 break; 1127 } 1128 } 1129 /* re-insert all entries from the failed_list into ipm_list */ 1130 list_for_each_entry_safe(ipm, tmp, &failed_list, list) 1131 list_move_tail(&ipm->list, &card->ipm_list); 1132 1133 spin_unlock_irqrestore(&card->ipm_lock, flags); 1134 } 1135 1136 /** 1137 * get mac address for the relevant Multicast address 1138 */ 1139 static void 1140 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev) 1141 { 1142 LCS_DBF_TEXT(4,trace, "getmac"); 1143 ip_eth_mc_map(ipm, mac); 1144 } 1145 1146 /** 1147 * function called by net device to handle multicast address relevant things 1148 */ 1149 static void lcs_remove_mc_addresses(struct lcs_card *card, 1150 struct in_device *in4_dev) 1151 { 1152 struct ip_mc_list *im4; 1153 struct list_head *l; 1154 struct lcs_ipm_list *ipm; 1155 unsigned long flags; 1156 char buf[MAX_ADDR_LEN]; 1157 1158 LCS_DBF_TEXT(4, trace, "remmclst"); 1159 spin_lock_irqsave(&card->ipm_lock, flags); 1160 list_for_each(l, &card->ipm_list) { 1161 ipm = list_entry(l, struct lcs_ipm_list, list); 1162 for (im4 = rcu_dereference(in4_dev->mc_list); 1163 im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) { 1164 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev); 1165 if ( (ipm->ipm.ip_addr == im4->multiaddr) && 1166 (memcmp(buf, &ipm->ipm.mac_addr, 1167 LCS_MAC_LENGTH) == 0) ) 1168 break; 1169 } 1170 if (im4 == NULL) 1171 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED; 1172 } 1173 spin_unlock_irqrestore(&card->ipm_lock, flags); 1174 } 1175 1176 static struct lcs_ipm_list *lcs_check_addr_entry(struct lcs_card *card, 1177 struct ip_mc_list *im4, 1178 char *buf) 1179 { 1180 struct lcs_ipm_list *tmp, *ipm = NULL; 1181 struct list_head *l; 1182 unsigned long flags; 1183 1184 LCS_DBF_TEXT(4, trace, "chkmcent"); 1185 spin_lock_irqsave(&card->ipm_lock, flags); 1186 list_for_each(l, &card->ipm_list) { 1187 tmp = list_entry(l, struct lcs_ipm_list, list); 1188 if ( (tmp->ipm.ip_addr == im4->multiaddr) && 1189 (memcmp(buf, &tmp->ipm.mac_addr, 1190 LCS_MAC_LENGTH) == 0) ) { 1191 ipm = tmp; 1192 break; 1193 } 1194 } 1195 spin_unlock_irqrestore(&card->ipm_lock, flags); 1196 return ipm; 1197 } 1198 1199 static void lcs_set_mc_addresses(struct lcs_card *card, 1200 struct in_device *in4_dev) 1201 { 1202 1203 struct ip_mc_list *im4; 1204 struct lcs_ipm_list *ipm; 1205 char buf[MAX_ADDR_LEN]; 1206 unsigned long flags; 1207 1208 LCS_DBF_TEXT(4, trace, "setmclst"); 1209 for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL; 1210 im4 = rcu_dereference(im4->next_rcu)) { 1211 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev); 1212 ipm = lcs_check_addr_entry(card, im4, buf); 1213 if (ipm != NULL) 1214 continue; /* Address already in list. */ 1215 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC); 1216 if (ipm == NULL) { 1217 pr_info("Not enough memory to add" 1218 " new multicast entry!\n"); 1219 break; 1220 } 1221 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH); 1222 ipm->ipm.ip_addr = im4->multiaddr; 1223 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED; 1224 spin_lock_irqsave(&card->ipm_lock, flags); 1225 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4); 1226 list_add(&ipm->list, &card->ipm_list); 1227 spin_unlock_irqrestore(&card->ipm_lock, flags); 1228 } 1229 } 1230 1231 static int 1232 lcs_register_mc_addresses(void *data) 1233 { 1234 struct lcs_card *card; 1235 struct in_device *in4_dev; 1236 1237 card = (struct lcs_card *) data; 1238 1239 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD)) 1240 return 0; 1241 LCS_DBF_TEXT(4, trace, "regmulti"); 1242 1243 in4_dev = in_dev_get(card->dev); 1244 if (in4_dev == NULL) 1245 goto out; 1246 rcu_read_lock(); 1247 lcs_remove_mc_addresses(card,in4_dev); 1248 lcs_set_mc_addresses(card, in4_dev); 1249 rcu_read_unlock(); 1250 in_dev_put(in4_dev); 1251 1252 netif_carrier_off(card->dev); 1253 netif_tx_disable(card->dev); 1254 wait_event(card->write.wait_q, 1255 (card->write.state != LCS_CH_STATE_RUNNING)); 1256 lcs_fix_multicast_list(card); 1257 if (card->state == DEV_STATE_UP) { 1258 netif_carrier_on(card->dev); 1259 netif_wake_queue(card->dev); 1260 } 1261 out: 1262 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD); 1263 return 0; 1264 } 1265 #endif /* CONFIG_IP_MULTICAST */ 1266 1267 /** 1268 * function called by net device to 1269 * handle multicast address relevant things 1270 */ 1271 static void 1272 lcs_set_multicast_list(struct net_device *dev) 1273 { 1274 #ifdef CONFIG_IP_MULTICAST 1275 struct lcs_card *card; 1276 1277 LCS_DBF_TEXT(4, trace, "setmulti"); 1278 card = (struct lcs_card *) dev->ml_priv; 1279 1280 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD)) 1281 schedule_work(&card->kernel_thread_starter); 1282 #endif /* CONFIG_IP_MULTICAST */ 1283 } 1284 1285 static long 1286 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb) 1287 { 1288 if (!IS_ERR(irb)) 1289 return 0; 1290 1291 switch (PTR_ERR(irb)) { 1292 case -EIO: 1293 dev_warn(&cdev->dev, 1294 "An I/O-error occurred on the LCS device\n"); 1295 LCS_DBF_TEXT(2, trace, "ckirberr"); 1296 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO); 1297 break; 1298 case -ETIMEDOUT: 1299 dev_warn(&cdev->dev, 1300 "A command timed out on the LCS device\n"); 1301 LCS_DBF_TEXT(2, trace, "ckirberr"); 1302 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT); 1303 break; 1304 default: 1305 dev_warn(&cdev->dev, 1306 "An error occurred on the LCS device, rc=%ld\n", 1307 PTR_ERR(irb)); 1308 LCS_DBF_TEXT(2, trace, "ckirberr"); 1309 LCS_DBF_TEXT(2, trace, " rc???"); 1310 } 1311 return PTR_ERR(irb); 1312 } 1313 1314 static int 1315 lcs_get_problem(struct ccw_device *cdev, struct irb *irb) 1316 { 1317 int dstat, cstat; 1318 char *sense; 1319 1320 sense = (char *) irb->ecw; 1321 cstat = irb->scsw.cmd.cstat; 1322 dstat = irb->scsw.cmd.dstat; 1323 1324 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK | 1325 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK | 1326 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) { 1327 LCS_DBF_TEXT(2, trace, "CGENCHK"); 1328 return 1; 1329 } 1330 if (dstat & DEV_STAT_UNIT_CHECK) { 1331 if (sense[LCS_SENSE_BYTE_1] & 1332 LCS_SENSE_RESETTING_EVENT) { 1333 LCS_DBF_TEXT(2, trace, "REVIND"); 1334 return 1; 1335 } 1336 if (sense[LCS_SENSE_BYTE_0] & 1337 LCS_SENSE_CMD_REJECT) { 1338 LCS_DBF_TEXT(2, trace, "CMDREJ"); 1339 return 0; 1340 } 1341 if ((!sense[LCS_SENSE_BYTE_0]) && 1342 (!sense[LCS_SENSE_BYTE_1]) && 1343 (!sense[LCS_SENSE_BYTE_2]) && 1344 (!sense[LCS_SENSE_BYTE_3])) { 1345 LCS_DBF_TEXT(2, trace, "ZEROSEN"); 1346 return 0; 1347 } 1348 LCS_DBF_TEXT(2, trace, "DGENCHK"); 1349 return 1; 1350 } 1351 return 0; 1352 } 1353 1354 static void 1355 lcs_schedule_recovery(struct lcs_card *card) 1356 { 1357 LCS_DBF_TEXT(2, trace, "startrec"); 1358 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD)) 1359 schedule_work(&card->kernel_thread_starter); 1360 } 1361 1362 /** 1363 * IRQ Handler for LCS channels 1364 */ 1365 static void 1366 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) 1367 { 1368 struct lcs_card *card; 1369 struct lcs_channel *channel; 1370 int rc, index; 1371 int cstat, dstat; 1372 1373 if (lcs_check_irb_error(cdev, irb)) 1374 return; 1375 1376 card = CARD_FROM_DEV(cdev); 1377 if (card->read.ccwdev == cdev) 1378 channel = &card->read; 1379 else 1380 channel = &card->write; 1381 1382 cstat = irb->scsw.cmd.cstat; 1383 dstat = irb->scsw.cmd.dstat; 1384 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev)); 1385 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat, 1386 irb->scsw.cmd.dstat); 1387 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl, 1388 irb->scsw.cmd.actl); 1389 1390 /* Check for channel and device errors presented */ 1391 rc = lcs_get_problem(cdev, irb); 1392 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) { 1393 dev_warn(&cdev->dev, 1394 "The LCS device stopped because of an error," 1395 " dstat=0x%X, cstat=0x%X \n", 1396 dstat, cstat); 1397 if (rc) { 1398 channel->state = LCS_CH_STATE_ERROR; 1399 } 1400 } 1401 if (channel->state == LCS_CH_STATE_ERROR) { 1402 lcs_schedule_recovery(card); 1403 wake_up(&card->wait_q); 1404 return; 1405 } 1406 /* How far in the ccw chain have we processed? */ 1407 if ((channel->state != LCS_CH_STATE_INIT) && 1408 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) && 1409 (irb->scsw.cmd.cpa != 0)) { 1410 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa) 1411 - channel->ccws; 1412 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) || 1413 (irb->scsw.cmd.cstat & SCHN_STAT_PCI)) 1414 /* Bloody io subsystem tells us lies about cpa... */ 1415 index = (index - 1) & (LCS_NUM_BUFFS - 1); 1416 while (channel->io_idx != index) { 1417 __lcs_processed_buffer(channel, 1418 channel->iob + channel->io_idx); 1419 channel->io_idx = 1420 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1); 1421 } 1422 } 1423 1424 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) || 1425 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) || 1426 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)) 1427 /* Mark channel as stopped. */ 1428 channel->state = LCS_CH_STATE_STOPPED; 1429 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) 1430 /* CCW execution stopped on a suspend bit. */ 1431 channel->state = LCS_CH_STATE_SUSPENDED; 1432 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) { 1433 if (irb->scsw.cmd.cc != 0) { 1434 ccw_device_halt(channel->ccwdev, (addr_t) channel); 1435 return; 1436 } 1437 /* The channel has been stopped by halt_IO. */ 1438 channel->state = LCS_CH_STATE_HALTED; 1439 } 1440 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC) 1441 channel->state = LCS_CH_STATE_CLEARED; 1442 /* Do the rest in the tasklet. */ 1443 tasklet_schedule(&channel->irq_tasklet); 1444 } 1445 1446 /** 1447 * Tasklet for IRQ handler 1448 */ 1449 static void 1450 lcs_tasklet(unsigned long data) 1451 { 1452 unsigned long flags; 1453 struct lcs_channel *channel; 1454 struct lcs_buffer *iob; 1455 int buf_idx; 1456 1457 channel = (struct lcs_channel *) data; 1458 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev)); 1459 1460 /* Check for processed buffers. */ 1461 iob = channel->iob; 1462 buf_idx = channel->buf_idx; 1463 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) { 1464 /* Do the callback thing. */ 1465 if (iob[buf_idx].callback != NULL) 1466 iob[buf_idx].callback(channel, iob + buf_idx); 1467 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1); 1468 } 1469 channel->buf_idx = buf_idx; 1470 1471 if (channel->state == LCS_CH_STATE_STOPPED) 1472 lcs_start_channel(channel); 1473 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 1474 if (channel->state == LCS_CH_STATE_SUSPENDED && 1475 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) 1476 __lcs_resume_channel(channel); 1477 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 1478 1479 /* Something happened on the channel. Wake up waiters. */ 1480 wake_up(&channel->wait_q); 1481 } 1482 1483 /** 1484 * Finish current tx buffer and make it ready for transmit. 1485 */ 1486 static void 1487 __lcs_emit_txbuffer(struct lcs_card *card) 1488 { 1489 LCS_DBF_TEXT(5, trace, "emittx"); 1490 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0; 1491 card->tx_buffer->count += 2; 1492 lcs_ready_buffer(&card->write, card->tx_buffer); 1493 card->tx_buffer = NULL; 1494 card->tx_emitted++; 1495 } 1496 1497 /** 1498 * Callback for finished tx buffers. 1499 */ 1500 static void 1501 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer) 1502 { 1503 struct lcs_card *card; 1504 1505 LCS_DBF_TEXT(5, trace, "txbuffcb"); 1506 /* Put buffer back to pool. */ 1507 lcs_release_buffer(channel, buffer); 1508 card = container_of(channel, struct lcs_card, write); 1509 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev)) 1510 netif_wake_queue(card->dev); 1511 spin_lock(&card->lock); 1512 card->tx_emitted--; 1513 if (card->tx_emitted <= 0 && card->tx_buffer != NULL) 1514 /* 1515 * Last running tx buffer has finished. Submit partially 1516 * filled current buffer. 1517 */ 1518 __lcs_emit_txbuffer(card); 1519 spin_unlock(&card->lock); 1520 } 1521 1522 /** 1523 * Packet transmit function called by network stack 1524 */ 1525 static int 1526 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb, 1527 struct net_device *dev) 1528 { 1529 struct lcs_header *header; 1530 int rc = NETDEV_TX_OK; 1531 1532 LCS_DBF_TEXT(5, trace, "hardxmit"); 1533 if (skb == NULL) { 1534 card->stats.tx_dropped++; 1535 card->stats.tx_errors++; 1536 return NETDEV_TX_OK; 1537 } 1538 if (card->state != DEV_STATE_UP) { 1539 dev_kfree_skb(skb); 1540 card->stats.tx_dropped++; 1541 card->stats.tx_errors++; 1542 card->stats.tx_carrier_errors++; 1543 return NETDEV_TX_OK; 1544 } 1545 if (skb->protocol == htons(ETH_P_IPV6)) { 1546 dev_kfree_skb(skb); 1547 return NETDEV_TX_OK; 1548 } 1549 netif_stop_queue(card->dev); 1550 spin_lock(&card->lock); 1551 if (card->tx_buffer != NULL && 1552 card->tx_buffer->count + sizeof(struct lcs_header) + 1553 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE) 1554 /* skb too big for current tx buffer. */ 1555 __lcs_emit_txbuffer(card); 1556 if (card->tx_buffer == NULL) { 1557 /* Get new tx buffer */ 1558 card->tx_buffer = lcs_get_buffer(&card->write); 1559 if (card->tx_buffer == NULL) { 1560 card->stats.tx_dropped++; 1561 rc = NETDEV_TX_BUSY; 1562 goto out; 1563 } 1564 card->tx_buffer->callback = lcs_txbuffer_cb; 1565 card->tx_buffer->count = 0; 1566 } 1567 header = (struct lcs_header *) 1568 (card->tx_buffer->data + card->tx_buffer->count); 1569 card->tx_buffer->count += skb->len + sizeof(struct lcs_header); 1570 header->offset = card->tx_buffer->count; 1571 header->type = card->lan_type; 1572 header->slot = card->portno; 1573 skb_copy_from_linear_data(skb, header + 1, skb->len); 1574 spin_unlock(&card->lock); 1575 card->stats.tx_bytes += skb->len; 1576 card->stats.tx_packets++; 1577 dev_kfree_skb(skb); 1578 netif_wake_queue(card->dev); 1579 spin_lock(&card->lock); 1580 if (card->tx_emitted <= 0 && card->tx_buffer != NULL) 1581 /* If this is the first tx buffer emit it immediately. */ 1582 __lcs_emit_txbuffer(card); 1583 out: 1584 spin_unlock(&card->lock); 1585 return rc; 1586 } 1587 1588 static int 1589 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev) 1590 { 1591 struct lcs_card *card; 1592 int rc; 1593 1594 LCS_DBF_TEXT(5, trace, "pktxmit"); 1595 card = (struct lcs_card *) dev->ml_priv; 1596 rc = __lcs_start_xmit(card, skb, dev); 1597 return rc; 1598 } 1599 1600 /** 1601 * send startlan and lanstat command to make LCS device ready 1602 */ 1603 static int 1604 lcs_startlan_auto(struct lcs_card *card) 1605 { 1606 int rc; 1607 1608 LCS_DBF_TEXT(2, trace, "strtauto"); 1609 #ifdef CONFIG_ETHERNET 1610 card->lan_type = LCS_FRAME_TYPE_ENET; 1611 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); 1612 if (rc == 0) 1613 return 0; 1614 1615 #endif 1616 #ifdef CONFIG_FDDI 1617 card->lan_type = LCS_FRAME_TYPE_FDDI; 1618 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); 1619 if (rc == 0) 1620 return 0; 1621 #endif 1622 return -EIO; 1623 } 1624 1625 static int 1626 lcs_startlan(struct lcs_card *card) 1627 { 1628 int rc, i; 1629 1630 LCS_DBF_TEXT(2, trace, "startlan"); 1631 rc = 0; 1632 if (card->portno != LCS_INVALID_PORT_NO) { 1633 if (card->lan_type == LCS_FRAME_TYPE_AUTO) 1634 rc = lcs_startlan_auto(card); 1635 else 1636 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); 1637 } else { 1638 for (i = 0; i <= 16; i++) { 1639 card->portno = i; 1640 if (card->lan_type != LCS_FRAME_TYPE_AUTO) 1641 rc = lcs_send_startlan(card, 1642 LCS_INITIATOR_TCPIP); 1643 else 1644 /* autodetecting lan type */ 1645 rc = lcs_startlan_auto(card); 1646 if (rc == 0) 1647 break; 1648 } 1649 } 1650 if (rc == 0) 1651 return lcs_send_lanstat(card); 1652 return rc; 1653 } 1654 1655 /** 1656 * LCS detect function 1657 * setup channels and make them I/O ready 1658 */ 1659 static int 1660 lcs_detect(struct lcs_card *card) 1661 { 1662 int rc = 0; 1663 1664 LCS_DBF_TEXT(2, setup, "lcsdetct"); 1665 /* start/reset card */ 1666 if (card->dev) 1667 netif_stop_queue(card->dev); 1668 rc = lcs_stop_channels(card); 1669 if (rc == 0) { 1670 rc = lcs_start_channels(card); 1671 if (rc == 0) { 1672 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP); 1673 if (rc == 0) 1674 rc = lcs_startlan(card); 1675 } 1676 } 1677 if (rc == 0) { 1678 card->state = DEV_STATE_UP; 1679 } else { 1680 card->state = DEV_STATE_DOWN; 1681 card->write.state = LCS_CH_STATE_INIT; 1682 card->read.state = LCS_CH_STATE_INIT; 1683 } 1684 return rc; 1685 } 1686 1687 /** 1688 * LCS Stop card 1689 */ 1690 static int 1691 lcs_stopcard(struct lcs_card *card) 1692 { 1693 int rc; 1694 1695 LCS_DBF_TEXT(3, setup, "stopcard"); 1696 1697 if (card->read.state != LCS_CH_STATE_STOPPED && 1698 card->write.state != LCS_CH_STATE_STOPPED && 1699 card->read.state != LCS_CH_STATE_ERROR && 1700 card->write.state != LCS_CH_STATE_ERROR && 1701 card->state == DEV_STATE_UP) { 1702 lcs_clear_multicast_list(card); 1703 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP); 1704 rc = lcs_send_shutdown(card); 1705 } 1706 rc = lcs_stop_channels(card); 1707 card->state = DEV_STATE_DOWN; 1708 1709 return rc; 1710 } 1711 1712 /** 1713 * Kernel Thread helper functions for LGW initiated commands 1714 */ 1715 static void 1716 lcs_start_kernel_thread(struct work_struct *work) 1717 { 1718 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter); 1719 LCS_DBF_TEXT(5, trace, "krnthrd"); 1720 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD)) 1721 kthread_run(lcs_recovery, card, "lcs_recover"); 1722 #ifdef CONFIG_IP_MULTICAST 1723 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD)) 1724 kthread_run(lcs_register_mc_addresses, card, "regipm"); 1725 #endif 1726 } 1727 1728 /** 1729 * Process control frames. 1730 */ 1731 static void 1732 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd) 1733 { 1734 LCS_DBF_TEXT(5, trace, "getctrl"); 1735 if (cmd->initiator == LCS_INITIATOR_LGW) { 1736 switch(cmd->cmd_code) { 1737 case LCS_CMD_STARTUP: 1738 case LCS_CMD_STARTLAN: 1739 lcs_schedule_recovery(card); 1740 break; 1741 case LCS_CMD_STOPLAN: 1742 pr_warn("Stoplan for %s initiated by LGW\n", 1743 card->dev->name); 1744 if (card->dev) 1745 netif_carrier_off(card->dev); 1746 break; 1747 default: 1748 LCS_DBF_TEXT(5, trace, "noLGWcmd"); 1749 break; 1750 } 1751 } else 1752 lcs_notify_lancmd_waiters(card, cmd); 1753 } 1754 1755 /** 1756 * Unpack network packet. 1757 */ 1758 static void 1759 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len) 1760 { 1761 struct sk_buff *skb; 1762 1763 LCS_DBF_TEXT(5, trace, "getskb"); 1764 if (card->dev == NULL || 1765 card->state != DEV_STATE_UP) 1766 /* The card isn't up. Ignore the packet. */ 1767 return; 1768 1769 skb = dev_alloc_skb(skb_len); 1770 if (skb == NULL) { 1771 dev_err(&card->dev->dev, 1772 " Allocating a socket buffer to interface %s failed\n", 1773 card->dev->name); 1774 card->stats.rx_dropped++; 1775 return; 1776 } 1777 skb_put_data(skb, skb_data, skb_len); 1778 skb->protocol = card->lan_type_trans(skb, card->dev); 1779 card->stats.rx_bytes += skb_len; 1780 card->stats.rx_packets++; 1781 if (skb->protocol == htons(ETH_P_802_2)) 1782 *((__u32 *)skb->cb) = ++card->pkt_seq; 1783 netif_rx(skb); 1784 } 1785 1786 /** 1787 * LCS main routine to get packets and lancmd replies from the buffers 1788 */ 1789 static void 1790 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer) 1791 { 1792 struct lcs_card *card; 1793 struct lcs_header *lcs_hdr; 1794 __u16 offset; 1795 1796 LCS_DBF_TEXT(5, trace, "lcsgtpkt"); 1797 lcs_hdr = (struct lcs_header *) buffer->data; 1798 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) { 1799 LCS_DBF_TEXT(4, trace, "-eiogpkt"); 1800 return; 1801 } 1802 card = container_of(channel, struct lcs_card, read); 1803 offset = 0; 1804 while (lcs_hdr->offset != 0) { 1805 if (lcs_hdr->offset <= 0 || 1806 lcs_hdr->offset > LCS_IOBUFFERSIZE || 1807 lcs_hdr->offset < offset) { 1808 /* Offset invalid. */ 1809 card->stats.rx_length_errors++; 1810 card->stats.rx_errors++; 1811 return; 1812 } 1813 /* What kind of frame is it? */ 1814 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL) 1815 /* Control frame. */ 1816 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr); 1817 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET || 1818 lcs_hdr->type == LCS_FRAME_TYPE_TR || 1819 lcs_hdr->type == LCS_FRAME_TYPE_FDDI) 1820 /* Normal network packet. */ 1821 lcs_get_skb(card, (char *)(lcs_hdr + 1), 1822 lcs_hdr->offset - offset - 1823 sizeof(struct lcs_header)); 1824 else 1825 /* Unknown frame type. */ 1826 ; // FIXME: error message ? 1827 /* Proceed to next frame. */ 1828 offset = lcs_hdr->offset; 1829 lcs_hdr->offset = LCS_ILLEGAL_OFFSET; 1830 lcs_hdr = (struct lcs_header *) (buffer->data + offset); 1831 } 1832 /* The buffer is now empty. Make it ready again. */ 1833 lcs_ready_buffer(&card->read, buffer); 1834 } 1835 1836 /** 1837 * get network statistics for ifconfig and other user programs 1838 */ 1839 static struct net_device_stats * 1840 lcs_getstats(struct net_device *dev) 1841 { 1842 struct lcs_card *card; 1843 1844 LCS_DBF_TEXT(4, trace, "netstats"); 1845 card = (struct lcs_card *) dev->ml_priv; 1846 return &card->stats; 1847 } 1848 1849 /** 1850 * stop lcs device 1851 * This function will be called by user doing ifconfig xxx down 1852 */ 1853 static int 1854 lcs_stop_device(struct net_device *dev) 1855 { 1856 struct lcs_card *card; 1857 int rc; 1858 1859 LCS_DBF_TEXT(2, trace, "stopdev"); 1860 card = (struct lcs_card *) dev->ml_priv; 1861 netif_carrier_off(dev); 1862 netif_tx_disable(dev); 1863 dev->flags &= ~IFF_UP; 1864 wait_event(card->write.wait_q, 1865 (card->write.state != LCS_CH_STATE_RUNNING)); 1866 rc = lcs_stopcard(card); 1867 if (rc) 1868 dev_err(&card->dev->dev, 1869 " Shutting down the LCS device failed\n"); 1870 return rc; 1871 } 1872 1873 /** 1874 * start lcs device and make it runnable 1875 * This function will be called by user doing ifconfig xxx up 1876 */ 1877 static int 1878 lcs_open_device(struct net_device *dev) 1879 { 1880 struct lcs_card *card; 1881 int rc; 1882 1883 LCS_DBF_TEXT(2, trace, "opendev"); 1884 card = (struct lcs_card *) dev->ml_priv; 1885 /* initialize statistics */ 1886 rc = lcs_detect(card); 1887 if (rc) { 1888 pr_err("Error in opening device!\n"); 1889 1890 } else { 1891 dev->flags |= IFF_UP; 1892 netif_carrier_on(dev); 1893 netif_wake_queue(dev); 1894 card->state = DEV_STATE_UP; 1895 } 1896 return rc; 1897 } 1898 1899 /** 1900 * show function for portno called by cat or similar things 1901 */ 1902 static ssize_t 1903 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf) 1904 { 1905 struct lcs_card *card; 1906 1907 card = dev_get_drvdata(dev); 1908 1909 if (!card) 1910 return 0; 1911 1912 return sprintf(buf, "%d\n", card->portno); 1913 } 1914 1915 /** 1916 * store the value which is piped to file portno 1917 */ 1918 static ssize_t 1919 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 1920 { 1921 struct lcs_card *card; 1922 int rc; 1923 s16 value; 1924 1925 card = dev_get_drvdata(dev); 1926 1927 if (!card) 1928 return 0; 1929 1930 rc = kstrtos16(buf, 0, &value); 1931 if (rc) 1932 return -EINVAL; 1933 /* TODO: sanity checks */ 1934 card->portno = value; 1935 1936 return count; 1937 1938 } 1939 1940 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store); 1941 1942 static const char *lcs_type[] = { 1943 "not a channel", 1944 "2216 parallel", 1945 "2216 channel", 1946 "OSA LCS card", 1947 "unknown channel type", 1948 "unsupported channel type", 1949 }; 1950 1951 static ssize_t 1952 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf) 1953 { 1954 struct ccwgroup_device *cgdev; 1955 1956 cgdev = to_ccwgroupdev(dev); 1957 if (!cgdev) 1958 return -ENODEV; 1959 1960 return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]); 1961 } 1962 1963 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL); 1964 1965 static ssize_t 1966 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf) 1967 { 1968 struct lcs_card *card; 1969 1970 card = dev_get_drvdata(dev); 1971 1972 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0; 1973 } 1974 1975 static ssize_t 1976 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 1977 { 1978 struct lcs_card *card; 1979 unsigned int value; 1980 int rc; 1981 1982 card = dev_get_drvdata(dev); 1983 1984 if (!card) 1985 return 0; 1986 1987 rc = kstrtouint(buf, 0, &value); 1988 if (rc) 1989 return -EINVAL; 1990 /* TODO: sanity checks */ 1991 card->lancmd_timeout = value; 1992 1993 return count; 1994 1995 } 1996 1997 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store); 1998 1999 static ssize_t 2000 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr, 2001 const char *buf, size_t count) 2002 { 2003 struct lcs_card *card = dev_get_drvdata(dev); 2004 char *tmp; 2005 int i; 2006 2007 if (!card) 2008 return -EINVAL; 2009 if (card->state != DEV_STATE_UP) 2010 return -EPERM; 2011 i = simple_strtoul(buf, &tmp, 16); 2012 if (i == 1) 2013 lcs_schedule_recovery(card); 2014 return count; 2015 } 2016 2017 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store); 2018 2019 static struct attribute * lcs_attrs[] = { 2020 &dev_attr_portno.attr, 2021 &dev_attr_type.attr, 2022 &dev_attr_lancmd_timeout.attr, 2023 &dev_attr_recover.attr, 2024 NULL, 2025 }; 2026 static struct attribute_group lcs_attr_group = { 2027 .attrs = lcs_attrs, 2028 }; 2029 static const struct attribute_group *lcs_attr_groups[] = { 2030 &lcs_attr_group, 2031 NULL, 2032 }; 2033 static const struct device_type lcs_devtype = { 2034 .name = "lcs", 2035 .groups = lcs_attr_groups, 2036 }; 2037 2038 /** 2039 * lcs_probe_device is called on establishing a new ccwgroup_device. 2040 */ 2041 static int 2042 lcs_probe_device(struct ccwgroup_device *ccwgdev) 2043 { 2044 struct lcs_card *card; 2045 2046 if (!get_device(&ccwgdev->dev)) 2047 return -ENODEV; 2048 2049 LCS_DBF_TEXT(2, setup, "add_dev"); 2050 card = lcs_alloc_card(); 2051 if (!card) { 2052 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM); 2053 put_device(&ccwgdev->dev); 2054 return -ENOMEM; 2055 } 2056 dev_set_drvdata(&ccwgdev->dev, card); 2057 ccwgdev->cdev[0]->handler = lcs_irq; 2058 ccwgdev->cdev[1]->handler = lcs_irq; 2059 card->gdev = ccwgdev; 2060 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread); 2061 card->thread_start_mask = 0; 2062 card->thread_allowed_mask = 0; 2063 card->thread_running_mask = 0; 2064 ccwgdev->dev.type = &lcs_devtype; 2065 2066 return 0; 2067 } 2068 2069 static int 2070 lcs_register_netdev(struct ccwgroup_device *ccwgdev) 2071 { 2072 struct lcs_card *card; 2073 2074 LCS_DBF_TEXT(2, setup, "regnetdv"); 2075 card = dev_get_drvdata(&ccwgdev->dev); 2076 if (card->dev->reg_state != NETREG_UNINITIALIZED) 2077 return 0; 2078 SET_NETDEV_DEV(card->dev, &ccwgdev->dev); 2079 return register_netdev(card->dev); 2080 } 2081 2082 /** 2083 * lcs_new_device will be called by setting the group device online. 2084 */ 2085 static const struct net_device_ops lcs_netdev_ops = { 2086 .ndo_open = lcs_open_device, 2087 .ndo_stop = lcs_stop_device, 2088 .ndo_get_stats = lcs_getstats, 2089 .ndo_start_xmit = lcs_start_xmit, 2090 }; 2091 2092 static const struct net_device_ops lcs_mc_netdev_ops = { 2093 .ndo_open = lcs_open_device, 2094 .ndo_stop = lcs_stop_device, 2095 .ndo_get_stats = lcs_getstats, 2096 .ndo_start_xmit = lcs_start_xmit, 2097 .ndo_set_rx_mode = lcs_set_multicast_list, 2098 }; 2099 2100 static int 2101 lcs_new_device(struct ccwgroup_device *ccwgdev) 2102 { 2103 struct lcs_card *card; 2104 struct net_device *dev=NULL; 2105 enum lcs_dev_states recover_state; 2106 int rc; 2107 2108 card = dev_get_drvdata(&ccwgdev->dev); 2109 if (!card) 2110 return -ENODEV; 2111 2112 LCS_DBF_TEXT(2, setup, "newdev"); 2113 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2114 card->read.ccwdev = ccwgdev->cdev[0]; 2115 card->write.ccwdev = ccwgdev->cdev[1]; 2116 2117 recover_state = card->state; 2118 rc = ccw_device_set_online(card->read.ccwdev); 2119 if (rc) 2120 goto out_err; 2121 rc = ccw_device_set_online(card->write.ccwdev); 2122 if (rc) 2123 goto out_werr; 2124 2125 LCS_DBF_TEXT(3, setup, "lcsnewdv"); 2126 2127 lcs_setup_card(card); 2128 rc = lcs_detect(card); 2129 if (rc) { 2130 LCS_DBF_TEXT(2, setup, "dtctfail"); 2131 dev_err(&ccwgdev->dev, 2132 "Detecting a network adapter for LCS devices" 2133 " failed with rc=%d (0x%x)\n", rc, rc); 2134 lcs_stopcard(card); 2135 goto out; 2136 } 2137 if (card->dev) { 2138 LCS_DBF_TEXT(2, setup, "samedev"); 2139 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2140 goto netdev_out; 2141 } 2142 switch (card->lan_type) { 2143 #ifdef CONFIG_ETHERNET 2144 case LCS_FRAME_TYPE_ENET: 2145 card->lan_type_trans = eth_type_trans; 2146 dev = alloc_etherdev(0); 2147 break; 2148 #endif 2149 #ifdef CONFIG_FDDI 2150 case LCS_FRAME_TYPE_FDDI: 2151 card->lan_type_trans = fddi_type_trans; 2152 dev = alloc_fddidev(0); 2153 break; 2154 #endif 2155 default: 2156 LCS_DBF_TEXT(3, setup, "errinit"); 2157 pr_err(" Initialization failed\n"); 2158 goto out; 2159 } 2160 if (!dev) 2161 goto out; 2162 card->dev = dev; 2163 card->dev->ml_priv = card; 2164 card->dev->netdev_ops = &lcs_netdev_ops; 2165 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH); 2166 #ifdef CONFIG_IP_MULTICAST 2167 if (!lcs_check_multicast_support(card)) 2168 card->dev->netdev_ops = &lcs_mc_netdev_ops; 2169 #endif 2170 netdev_out: 2171 lcs_set_allowed_threads(card,0xffffffff); 2172 if (recover_state == DEV_STATE_RECOVER) { 2173 lcs_set_multicast_list(card->dev); 2174 card->dev->flags |= IFF_UP; 2175 netif_carrier_on(card->dev); 2176 netif_wake_queue(card->dev); 2177 card->state = DEV_STATE_UP; 2178 } else { 2179 lcs_stopcard(card); 2180 } 2181 2182 if (lcs_register_netdev(ccwgdev) != 0) 2183 goto out; 2184 2185 /* Print out supported assists: IPv6 */ 2186 pr_info("LCS device %s %s IPv6 support\n", card->dev->name, 2187 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ? 2188 "with" : "without"); 2189 /* Print out supported assist: Multicast */ 2190 pr_info("LCS device %s %s Multicast support\n", card->dev->name, 2191 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ? 2192 "with" : "without"); 2193 return 0; 2194 out: 2195 2196 ccw_device_set_offline(card->write.ccwdev); 2197 out_werr: 2198 ccw_device_set_offline(card->read.ccwdev); 2199 out_err: 2200 return -ENODEV; 2201 } 2202 2203 /** 2204 * lcs_shutdown_device, called when setting the group device offline. 2205 */ 2206 static int 2207 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode) 2208 { 2209 struct lcs_card *card; 2210 enum lcs_dev_states recover_state; 2211 int ret = 0, ret2 = 0, ret3 = 0; 2212 2213 LCS_DBF_TEXT(3, setup, "shtdndev"); 2214 card = dev_get_drvdata(&ccwgdev->dev); 2215 if (!card) 2216 return -ENODEV; 2217 if (recovery_mode == 0) { 2218 lcs_set_allowed_threads(card, 0); 2219 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD)) 2220 return -ERESTARTSYS; 2221 } 2222 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2223 recover_state = card->state; 2224 2225 ret = lcs_stop_device(card->dev); 2226 ret2 = ccw_device_set_offline(card->read.ccwdev); 2227 ret3 = ccw_device_set_offline(card->write.ccwdev); 2228 if (!ret) 2229 ret = (ret2) ? ret2 : ret3; 2230 if (ret) 2231 LCS_DBF_TEXT_(3, setup, "1err:%d", ret); 2232 if (recover_state == DEV_STATE_UP) { 2233 card->state = DEV_STATE_RECOVER; 2234 } 2235 return 0; 2236 } 2237 2238 static int 2239 lcs_shutdown_device(struct ccwgroup_device *ccwgdev) 2240 { 2241 return __lcs_shutdown_device(ccwgdev, 0); 2242 } 2243 2244 /** 2245 * drive lcs recovery after startup and startlan initiated by Lan Gateway 2246 */ 2247 static int 2248 lcs_recovery(void *ptr) 2249 { 2250 struct lcs_card *card; 2251 struct ccwgroup_device *gdev; 2252 int rc; 2253 2254 card = (struct lcs_card *) ptr; 2255 2256 LCS_DBF_TEXT(4, trace, "recover1"); 2257 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD)) 2258 return 0; 2259 LCS_DBF_TEXT(4, trace, "recover2"); 2260 gdev = card->gdev; 2261 dev_warn(&gdev->dev, 2262 "A recovery process has been started for the LCS device\n"); 2263 rc = __lcs_shutdown_device(gdev, 1); 2264 rc = lcs_new_device(gdev); 2265 if (!rc) 2266 pr_info("Device %s successfully recovered!\n", 2267 card->dev->name); 2268 else 2269 pr_info("Device %s could not be recovered!\n", 2270 card->dev->name); 2271 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD); 2272 return 0; 2273 } 2274 2275 /** 2276 * lcs_remove_device, free buffers and card 2277 */ 2278 static void 2279 lcs_remove_device(struct ccwgroup_device *ccwgdev) 2280 { 2281 struct lcs_card *card; 2282 2283 card = dev_get_drvdata(&ccwgdev->dev); 2284 if (!card) 2285 return; 2286 2287 LCS_DBF_TEXT(3, setup, "remdev"); 2288 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2289 if (ccwgdev->state == CCWGROUP_ONLINE) { 2290 lcs_shutdown_device(ccwgdev); 2291 } 2292 if (card->dev) 2293 unregister_netdev(card->dev); 2294 lcs_cleanup_card(card); 2295 lcs_free_card(card); 2296 dev_set_drvdata(&ccwgdev->dev, NULL); 2297 put_device(&ccwgdev->dev); 2298 } 2299 2300 static int lcs_pm_suspend(struct lcs_card *card) 2301 { 2302 if (card->dev) 2303 netif_device_detach(card->dev); 2304 lcs_set_allowed_threads(card, 0); 2305 lcs_wait_for_threads(card, 0xffffffff); 2306 if (card->state != DEV_STATE_DOWN) 2307 __lcs_shutdown_device(card->gdev, 1); 2308 return 0; 2309 } 2310 2311 static int lcs_pm_resume(struct lcs_card *card) 2312 { 2313 int rc = 0; 2314 2315 if (card->state == DEV_STATE_RECOVER) 2316 rc = lcs_new_device(card->gdev); 2317 if (card->dev) 2318 netif_device_attach(card->dev); 2319 if (rc) { 2320 dev_warn(&card->gdev->dev, "The lcs device driver " 2321 "failed to recover the device\n"); 2322 } 2323 return rc; 2324 } 2325 2326 static int lcs_prepare(struct ccwgroup_device *gdev) 2327 { 2328 return 0; 2329 } 2330 2331 static void lcs_complete(struct ccwgroup_device *gdev) 2332 { 2333 return; 2334 } 2335 2336 static int lcs_freeze(struct ccwgroup_device *gdev) 2337 { 2338 struct lcs_card *card = dev_get_drvdata(&gdev->dev); 2339 return lcs_pm_suspend(card); 2340 } 2341 2342 static int lcs_thaw(struct ccwgroup_device *gdev) 2343 { 2344 struct lcs_card *card = dev_get_drvdata(&gdev->dev); 2345 return lcs_pm_resume(card); 2346 } 2347 2348 static int lcs_restore(struct ccwgroup_device *gdev) 2349 { 2350 struct lcs_card *card = dev_get_drvdata(&gdev->dev); 2351 return lcs_pm_resume(card); 2352 } 2353 2354 static struct ccw_device_id lcs_ids[] = { 2355 {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel}, 2356 {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216}, 2357 {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2}, 2358 {}, 2359 }; 2360 MODULE_DEVICE_TABLE(ccw, lcs_ids); 2361 2362 static struct ccw_driver lcs_ccw_driver = { 2363 .driver = { 2364 .owner = THIS_MODULE, 2365 .name = "lcs", 2366 }, 2367 .ids = lcs_ids, 2368 .probe = ccwgroup_probe_ccwdev, 2369 .remove = ccwgroup_remove_ccwdev, 2370 .int_class = IRQIO_LCS, 2371 }; 2372 2373 /** 2374 * LCS ccwgroup driver registration 2375 */ 2376 static struct ccwgroup_driver lcs_group_driver = { 2377 .driver = { 2378 .owner = THIS_MODULE, 2379 .name = "lcs", 2380 }, 2381 .ccw_driver = &lcs_ccw_driver, 2382 .setup = lcs_probe_device, 2383 .remove = lcs_remove_device, 2384 .set_online = lcs_new_device, 2385 .set_offline = lcs_shutdown_device, 2386 .prepare = lcs_prepare, 2387 .complete = lcs_complete, 2388 .freeze = lcs_freeze, 2389 .thaw = lcs_thaw, 2390 .restore = lcs_restore, 2391 }; 2392 2393 static ssize_t group_store(struct device_driver *ddrv, const char *buf, 2394 size_t count) 2395 { 2396 int err; 2397 err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf); 2398 return err ? err : count; 2399 } 2400 static DRIVER_ATTR_WO(group); 2401 2402 static struct attribute *lcs_drv_attrs[] = { 2403 &driver_attr_group.attr, 2404 NULL, 2405 }; 2406 static struct attribute_group lcs_drv_attr_group = { 2407 .attrs = lcs_drv_attrs, 2408 }; 2409 static const struct attribute_group *lcs_drv_attr_groups[] = { 2410 &lcs_drv_attr_group, 2411 NULL, 2412 }; 2413 2414 /** 2415 * LCS Module/Kernel initialization function 2416 */ 2417 static int 2418 __init lcs_init_module(void) 2419 { 2420 int rc; 2421 2422 pr_info("Loading %s\n", version); 2423 rc = lcs_register_debug_facility(); 2424 LCS_DBF_TEXT(0, setup, "lcsinit"); 2425 if (rc) 2426 goto out_err; 2427 lcs_root_dev = root_device_register("lcs"); 2428 rc = PTR_ERR_OR_ZERO(lcs_root_dev); 2429 if (rc) 2430 goto register_err; 2431 rc = ccw_driver_register(&lcs_ccw_driver); 2432 if (rc) 2433 goto ccw_err; 2434 lcs_group_driver.driver.groups = lcs_drv_attr_groups; 2435 rc = ccwgroup_driver_register(&lcs_group_driver); 2436 if (rc) 2437 goto ccwgroup_err; 2438 return 0; 2439 2440 ccwgroup_err: 2441 ccw_driver_unregister(&lcs_ccw_driver); 2442 ccw_err: 2443 root_device_unregister(lcs_root_dev); 2444 register_err: 2445 lcs_unregister_debug_facility(); 2446 out_err: 2447 pr_err("Initializing the lcs device driver failed\n"); 2448 return rc; 2449 } 2450 2451 2452 /** 2453 * LCS module cleanup function 2454 */ 2455 static void 2456 __exit lcs_cleanup_module(void) 2457 { 2458 pr_info("Terminating lcs module.\n"); 2459 LCS_DBF_TEXT(0, trace, "cleanup"); 2460 ccwgroup_driver_unregister(&lcs_group_driver); 2461 ccw_driver_unregister(&lcs_ccw_driver); 2462 root_device_unregister(lcs_root_dev); 2463 lcs_unregister_debug_facility(); 2464 } 2465 2466 module_init(lcs_init_module); 2467 module_exit(lcs_cleanup_module); 2468 2469 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>"); 2470 MODULE_LICENSE("GPL"); 2471 2472