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 refcount_inc(&reply->refcnt); 760 } 761 762 static void 763 lcs_put_reply(struct lcs_reply *reply) 764 { 765 if (refcount_dec_and_test(&reply->refcnt)) 766 kfree(reply); 767 } 768 769 static struct lcs_reply * 770 lcs_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 */ 791 static void 792 lcs_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 */ 819 static void 820 lcs_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 } 843 844 static int 845 lcs_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 */ 883 static int 884 lcs_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 */ 901 static int 902 lcs_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 */ 918 static 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 } 924 925 static int 926 lcs_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 */ 945 static int 946 lcs_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 */ 964 static 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 } 971 972 static int 973 lcs_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 */ 992 static int 993 lcs_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 */ 1016 static int 1017 lcs_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 */ 1040 static 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 1050 static int 1051 lcs_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 */ 1080 static void 1081 lcs_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); 1091 list_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 */ 1135 static void 1136 lcs_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 */ 1145 static 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 1172 static 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 1195 static 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 1227 static int 1228 lcs_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 } 1257 out: 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 */ 1267 static void 1268 lcs_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 1281 static long 1282 lcs_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 1310 static int 1311 lcs_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 1350 static void 1351 lcs_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 */ 1361 static void 1362 lcs_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, (addr_t) channel); 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 */ 1445 static void 1446 lcs_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 */ 1482 static 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 */ 1496 static void 1497 lcs_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 */ 1521 static int 1522 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb, 1523 struct net_device *dev) 1524 { 1525 struct lcs_header *header; 1526 int rc = NETDEV_TX_OK; 1527 1528 LCS_DBF_TEXT(5, trace, "hardxmit"); 1529 if (skb == NULL) { 1530 card->stats.tx_dropped++; 1531 card->stats.tx_errors++; 1532 return NETDEV_TX_OK; 1533 } 1534 if (card->state != DEV_STATE_UP) { 1535 dev_kfree_skb(skb); 1536 card->stats.tx_dropped++; 1537 card->stats.tx_errors++; 1538 card->stats.tx_carrier_errors++; 1539 return NETDEV_TX_OK; 1540 } 1541 if (skb->protocol == htons(ETH_P_IPV6)) { 1542 dev_kfree_skb(skb); 1543 return NETDEV_TX_OK; 1544 } 1545 netif_stop_queue(card->dev); 1546 spin_lock(&card->lock); 1547 if (card->tx_buffer != NULL && 1548 card->tx_buffer->count + sizeof(struct lcs_header) + 1549 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE) 1550 /* skb too big for current tx buffer. */ 1551 __lcs_emit_txbuffer(card); 1552 if (card->tx_buffer == NULL) { 1553 /* Get new tx buffer */ 1554 card->tx_buffer = lcs_get_buffer(&card->write); 1555 if (card->tx_buffer == NULL) { 1556 card->stats.tx_dropped++; 1557 rc = NETDEV_TX_BUSY; 1558 goto out; 1559 } 1560 card->tx_buffer->callback = lcs_txbuffer_cb; 1561 card->tx_buffer->count = 0; 1562 } 1563 header = (struct lcs_header *) 1564 (card->tx_buffer->data + card->tx_buffer->count); 1565 card->tx_buffer->count += skb->len + sizeof(struct lcs_header); 1566 header->offset = card->tx_buffer->count; 1567 header->type = card->lan_type; 1568 header->slot = card->portno; 1569 skb_copy_from_linear_data(skb, header + 1, skb->len); 1570 spin_unlock(&card->lock); 1571 card->stats.tx_bytes += skb->len; 1572 card->stats.tx_packets++; 1573 dev_kfree_skb(skb); 1574 netif_wake_queue(card->dev); 1575 spin_lock(&card->lock); 1576 if (card->tx_emitted <= 0 && card->tx_buffer != NULL) 1577 /* If this is the first tx buffer emit it immediately. */ 1578 __lcs_emit_txbuffer(card); 1579 out: 1580 spin_unlock(&card->lock); 1581 return rc; 1582 } 1583 1584 static int 1585 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev) 1586 { 1587 struct lcs_card *card; 1588 int rc; 1589 1590 LCS_DBF_TEXT(5, trace, "pktxmit"); 1591 card = (struct lcs_card *) dev->ml_priv; 1592 rc = __lcs_start_xmit(card, skb, dev); 1593 return rc; 1594 } 1595 1596 /** 1597 * send startlan and lanstat command to make LCS device ready 1598 */ 1599 static int 1600 lcs_startlan_auto(struct lcs_card *card) 1601 { 1602 int rc; 1603 1604 LCS_DBF_TEXT(2, trace, "strtauto"); 1605 #ifdef CONFIG_ETHERNET 1606 card->lan_type = LCS_FRAME_TYPE_ENET; 1607 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); 1608 if (rc == 0) 1609 return 0; 1610 1611 #endif 1612 #ifdef CONFIG_FDDI 1613 card->lan_type = LCS_FRAME_TYPE_FDDI; 1614 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); 1615 if (rc == 0) 1616 return 0; 1617 #endif 1618 return -EIO; 1619 } 1620 1621 static int 1622 lcs_startlan(struct lcs_card *card) 1623 { 1624 int rc, i; 1625 1626 LCS_DBF_TEXT(2, trace, "startlan"); 1627 rc = 0; 1628 if (card->portno != LCS_INVALID_PORT_NO) { 1629 if (card->lan_type == LCS_FRAME_TYPE_AUTO) 1630 rc = lcs_startlan_auto(card); 1631 else 1632 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); 1633 } else { 1634 for (i = 0; i <= 16; i++) { 1635 card->portno = i; 1636 if (card->lan_type != LCS_FRAME_TYPE_AUTO) 1637 rc = lcs_send_startlan(card, 1638 LCS_INITIATOR_TCPIP); 1639 else 1640 /* autodetecting lan type */ 1641 rc = lcs_startlan_auto(card); 1642 if (rc == 0) 1643 break; 1644 } 1645 } 1646 if (rc == 0) 1647 return lcs_send_lanstat(card); 1648 return rc; 1649 } 1650 1651 /** 1652 * LCS detect function 1653 * setup channels and make them I/O ready 1654 */ 1655 static int 1656 lcs_detect(struct lcs_card *card) 1657 { 1658 int rc = 0; 1659 1660 LCS_DBF_TEXT(2, setup, "lcsdetct"); 1661 /* start/reset card */ 1662 if (card->dev) 1663 netif_stop_queue(card->dev); 1664 rc = lcs_stop_channels(card); 1665 if (rc == 0) { 1666 rc = lcs_start_channels(card); 1667 if (rc == 0) { 1668 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP); 1669 if (rc == 0) 1670 rc = lcs_startlan(card); 1671 } 1672 } 1673 if (rc == 0) { 1674 card->state = DEV_STATE_UP; 1675 } else { 1676 card->state = DEV_STATE_DOWN; 1677 card->write.state = LCS_CH_STATE_INIT; 1678 card->read.state = LCS_CH_STATE_INIT; 1679 } 1680 return rc; 1681 } 1682 1683 /** 1684 * LCS Stop card 1685 */ 1686 static int 1687 lcs_stopcard(struct lcs_card *card) 1688 { 1689 int rc; 1690 1691 LCS_DBF_TEXT(3, setup, "stopcard"); 1692 1693 if (card->read.state != LCS_CH_STATE_STOPPED && 1694 card->write.state != LCS_CH_STATE_STOPPED && 1695 card->read.state != LCS_CH_STATE_ERROR && 1696 card->write.state != LCS_CH_STATE_ERROR && 1697 card->state == DEV_STATE_UP) { 1698 lcs_clear_multicast_list(card); 1699 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP); 1700 rc = lcs_send_shutdown(card); 1701 } 1702 rc = lcs_stop_channels(card); 1703 card->state = DEV_STATE_DOWN; 1704 1705 return rc; 1706 } 1707 1708 /** 1709 * Kernel Thread helper functions for LGW initiated commands 1710 */ 1711 static void 1712 lcs_start_kernel_thread(struct work_struct *work) 1713 { 1714 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter); 1715 LCS_DBF_TEXT(5, trace, "krnthrd"); 1716 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD)) 1717 kthread_run(lcs_recovery, card, "lcs_recover"); 1718 #ifdef CONFIG_IP_MULTICAST 1719 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD)) 1720 kthread_run(lcs_register_mc_addresses, card, "regipm"); 1721 #endif 1722 } 1723 1724 /** 1725 * Process control frames. 1726 */ 1727 static void 1728 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd) 1729 { 1730 LCS_DBF_TEXT(5, trace, "getctrl"); 1731 if (cmd->initiator == LCS_INITIATOR_LGW) { 1732 switch(cmd->cmd_code) { 1733 case LCS_CMD_STARTUP: 1734 case LCS_CMD_STARTLAN: 1735 lcs_schedule_recovery(card); 1736 break; 1737 case LCS_CMD_STOPLAN: 1738 pr_warn("Stoplan for %s initiated by LGW\n", 1739 card->dev->name); 1740 if (card->dev) 1741 netif_carrier_off(card->dev); 1742 break; 1743 default: 1744 LCS_DBF_TEXT(5, trace, "noLGWcmd"); 1745 break; 1746 } 1747 } else 1748 lcs_notify_lancmd_waiters(card, cmd); 1749 } 1750 1751 /** 1752 * Unpack network packet. 1753 */ 1754 static void 1755 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len) 1756 { 1757 struct sk_buff *skb; 1758 1759 LCS_DBF_TEXT(5, trace, "getskb"); 1760 if (card->dev == NULL || 1761 card->state != DEV_STATE_UP) 1762 /* The card isn't up. Ignore the packet. */ 1763 return; 1764 1765 skb = dev_alloc_skb(skb_len); 1766 if (skb == NULL) { 1767 dev_err(&card->dev->dev, 1768 " Allocating a socket buffer to interface %s failed\n", 1769 card->dev->name); 1770 card->stats.rx_dropped++; 1771 return; 1772 } 1773 skb_put_data(skb, skb_data, skb_len); 1774 skb->protocol = card->lan_type_trans(skb, card->dev); 1775 card->stats.rx_bytes += skb_len; 1776 card->stats.rx_packets++; 1777 if (skb->protocol == htons(ETH_P_802_2)) 1778 *((__u32 *)skb->cb) = ++card->pkt_seq; 1779 netif_rx(skb); 1780 } 1781 1782 /** 1783 * LCS main routine to get packets and lancmd replies from the buffers 1784 */ 1785 static void 1786 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer) 1787 { 1788 struct lcs_card *card; 1789 struct lcs_header *lcs_hdr; 1790 __u16 offset; 1791 1792 LCS_DBF_TEXT(5, trace, "lcsgtpkt"); 1793 lcs_hdr = (struct lcs_header *) buffer->data; 1794 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) { 1795 LCS_DBF_TEXT(4, trace, "-eiogpkt"); 1796 return; 1797 } 1798 card = container_of(channel, struct lcs_card, read); 1799 offset = 0; 1800 while (lcs_hdr->offset != 0) { 1801 if (lcs_hdr->offset <= 0 || 1802 lcs_hdr->offset > LCS_IOBUFFERSIZE || 1803 lcs_hdr->offset < offset) { 1804 /* Offset invalid. */ 1805 card->stats.rx_length_errors++; 1806 card->stats.rx_errors++; 1807 return; 1808 } 1809 /* What kind of frame is it? */ 1810 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL) 1811 /* Control frame. */ 1812 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr); 1813 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET || 1814 lcs_hdr->type == LCS_FRAME_TYPE_TR || 1815 lcs_hdr->type == LCS_FRAME_TYPE_FDDI) 1816 /* Normal network packet. */ 1817 lcs_get_skb(card, (char *)(lcs_hdr + 1), 1818 lcs_hdr->offset - offset - 1819 sizeof(struct lcs_header)); 1820 else 1821 /* Unknown frame type. */ 1822 ; // FIXME: error message ? 1823 /* Proceed to next frame. */ 1824 offset = lcs_hdr->offset; 1825 lcs_hdr->offset = LCS_ILLEGAL_OFFSET; 1826 lcs_hdr = (struct lcs_header *) (buffer->data + offset); 1827 } 1828 /* The buffer is now empty. Make it ready again. */ 1829 lcs_ready_buffer(&card->read, buffer); 1830 } 1831 1832 /** 1833 * get network statistics for ifconfig and other user programs 1834 */ 1835 static struct net_device_stats * 1836 lcs_getstats(struct net_device *dev) 1837 { 1838 struct lcs_card *card; 1839 1840 LCS_DBF_TEXT(4, trace, "netstats"); 1841 card = (struct lcs_card *) dev->ml_priv; 1842 return &card->stats; 1843 } 1844 1845 /** 1846 * stop lcs device 1847 * This function will be called by user doing ifconfig xxx down 1848 */ 1849 static int 1850 lcs_stop_device(struct net_device *dev) 1851 { 1852 struct lcs_card *card; 1853 int rc; 1854 1855 LCS_DBF_TEXT(2, trace, "stopdev"); 1856 card = (struct lcs_card *) dev->ml_priv; 1857 netif_carrier_off(dev); 1858 netif_tx_disable(dev); 1859 dev->flags &= ~IFF_UP; 1860 wait_event(card->write.wait_q, 1861 (card->write.state != LCS_CH_STATE_RUNNING)); 1862 rc = lcs_stopcard(card); 1863 if (rc) 1864 dev_err(&card->dev->dev, 1865 " Shutting down the LCS device failed\n"); 1866 return rc; 1867 } 1868 1869 /** 1870 * start lcs device and make it runnable 1871 * This function will be called by user doing ifconfig xxx up 1872 */ 1873 static int 1874 lcs_open_device(struct net_device *dev) 1875 { 1876 struct lcs_card *card; 1877 int rc; 1878 1879 LCS_DBF_TEXT(2, trace, "opendev"); 1880 card = (struct lcs_card *) dev->ml_priv; 1881 /* initialize statistics */ 1882 rc = lcs_detect(card); 1883 if (rc) { 1884 pr_err("Error in opening device!\n"); 1885 1886 } else { 1887 dev->flags |= IFF_UP; 1888 netif_carrier_on(dev); 1889 netif_wake_queue(dev); 1890 card->state = DEV_STATE_UP; 1891 } 1892 return rc; 1893 } 1894 1895 /** 1896 * show function for portno called by cat or similar things 1897 */ 1898 static ssize_t 1899 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf) 1900 { 1901 struct lcs_card *card; 1902 1903 card = dev_get_drvdata(dev); 1904 1905 if (!card) 1906 return 0; 1907 1908 return sprintf(buf, "%d\n", card->portno); 1909 } 1910 1911 /** 1912 * store the value which is piped to file portno 1913 */ 1914 static ssize_t 1915 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 1916 { 1917 struct lcs_card *card; 1918 int rc; 1919 s16 value; 1920 1921 card = dev_get_drvdata(dev); 1922 1923 if (!card) 1924 return 0; 1925 1926 rc = kstrtos16(buf, 0, &value); 1927 if (rc) 1928 return -EINVAL; 1929 /* TODO: sanity checks */ 1930 card->portno = value; 1931 if (card->dev) 1932 card->dev->dev_port = card->portno; 1933 1934 return count; 1935 1936 } 1937 1938 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store); 1939 1940 static const char *lcs_type[] = { 1941 "not a channel", 1942 "2216 parallel", 1943 "2216 channel", 1944 "OSA LCS card", 1945 "unknown channel type", 1946 "unsupported channel type", 1947 }; 1948 1949 static ssize_t 1950 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf) 1951 { 1952 struct ccwgroup_device *cgdev; 1953 1954 cgdev = to_ccwgroupdev(dev); 1955 if (!cgdev) 1956 return -ENODEV; 1957 1958 return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]); 1959 } 1960 1961 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL); 1962 1963 static ssize_t 1964 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf) 1965 { 1966 struct lcs_card *card; 1967 1968 card = dev_get_drvdata(dev); 1969 1970 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0; 1971 } 1972 1973 static ssize_t 1974 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 1975 { 1976 struct lcs_card *card; 1977 unsigned int value; 1978 int rc; 1979 1980 card = dev_get_drvdata(dev); 1981 1982 if (!card) 1983 return 0; 1984 1985 rc = kstrtouint(buf, 0, &value); 1986 if (rc) 1987 return -EINVAL; 1988 /* TODO: sanity checks */ 1989 card->lancmd_timeout = value; 1990 1991 return count; 1992 1993 } 1994 1995 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store); 1996 1997 static ssize_t 1998 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr, 1999 const char *buf, size_t count) 2000 { 2001 struct lcs_card *card = dev_get_drvdata(dev); 2002 char *tmp; 2003 int i; 2004 2005 if (!card) 2006 return -EINVAL; 2007 if (card->state != DEV_STATE_UP) 2008 return -EPERM; 2009 i = simple_strtoul(buf, &tmp, 16); 2010 if (i == 1) 2011 lcs_schedule_recovery(card); 2012 return count; 2013 } 2014 2015 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store); 2016 2017 static struct attribute * lcs_attrs[] = { 2018 &dev_attr_portno.attr, 2019 &dev_attr_type.attr, 2020 &dev_attr_lancmd_timeout.attr, 2021 &dev_attr_recover.attr, 2022 NULL, 2023 }; 2024 static struct attribute_group lcs_attr_group = { 2025 .attrs = lcs_attrs, 2026 }; 2027 static const struct attribute_group *lcs_attr_groups[] = { 2028 &lcs_attr_group, 2029 NULL, 2030 }; 2031 static const struct device_type lcs_devtype = { 2032 .name = "lcs", 2033 .groups = lcs_attr_groups, 2034 }; 2035 2036 /** 2037 * lcs_probe_device is called on establishing a new ccwgroup_device. 2038 */ 2039 static int 2040 lcs_probe_device(struct ccwgroup_device *ccwgdev) 2041 { 2042 struct lcs_card *card; 2043 2044 if (!get_device(&ccwgdev->dev)) 2045 return -ENODEV; 2046 2047 LCS_DBF_TEXT(2, setup, "add_dev"); 2048 card = lcs_alloc_card(); 2049 if (!card) { 2050 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM); 2051 put_device(&ccwgdev->dev); 2052 return -ENOMEM; 2053 } 2054 dev_set_drvdata(&ccwgdev->dev, card); 2055 ccwgdev->cdev[0]->handler = lcs_irq; 2056 ccwgdev->cdev[1]->handler = lcs_irq; 2057 card->gdev = ccwgdev; 2058 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread); 2059 card->thread_start_mask = 0; 2060 card->thread_allowed_mask = 0; 2061 card->thread_running_mask = 0; 2062 ccwgdev->dev.type = &lcs_devtype; 2063 2064 return 0; 2065 } 2066 2067 static int 2068 lcs_register_netdev(struct ccwgroup_device *ccwgdev) 2069 { 2070 struct lcs_card *card; 2071 2072 LCS_DBF_TEXT(2, setup, "regnetdv"); 2073 card = dev_get_drvdata(&ccwgdev->dev); 2074 if (card->dev->reg_state != NETREG_UNINITIALIZED) 2075 return 0; 2076 SET_NETDEV_DEV(card->dev, &ccwgdev->dev); 2077 return register_netdev(card->dev); 2078 } 2079 2080 /** 2081 * lcs_new_device will be called by setting the group device online. 2082 */ 2083 static const struct net_device_ops lcs_netdev_ops = { 2084 .ndo_open = lcs_open_device, 2085 .ndo_stop = lcs_stop_device, 2086 .ndo_get_stats = lcs_getstats, 2087 .ndo_start_xmit = lcs_start_xmit, 2088 }; 2089 2090 static const struct net_device_ops lcs_mc_netdev_ops = { 2091 .ndo_open = lcs_open_device, 2092 .ndo_stop = lcs_stop_device, 2093 .ndo_get_stats = lcs_getstats, 2094 .ndo_start_xmit = lcs_start_xmit, 2095 .ndo_set_rx_mode = lcs_set_multicast_list, 2096 }; 2097 2098 static int 2099 lcs_new_device(struct ccwgroup_device *ccwgdev) 2100 { 2101 struct lcs_card *card; 2102 struct net_device *dev=NULL; 2103 enum lcs_dev_states recover_state; 2104 int rc; 2105 2106 card = dev_get_drvdata(&ccwgdev->dev); 2107 if (!card) 2108 return -ENODEV; 2109 2110 LCS_DBF_TEXT(2, setup, "newdev"); 2111 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2112 card->read.ccwdev = ccwgdev->cdev[0]; 2113 card->write.ccwdev = ccwgdev->cdev[1]; 2114 2115 recover_state = card->state; 2116 rc = ccw_device_set_online(card->read.ccwdev); 2117 if (rc) 2118 goto out_err; 2119 rc = ccw_device_set_online(card->write.ccwdev); 2120 if (rc) 2121 goto out_werr; 2122 2123 LCS_DBF_TEXT(3, setup, "lcsnewdv"); 2124 2125 lcs_setup_card(card); 2126 rc = lcs_detect(card); 2127 if (rc) { 2128 LCS_DBF_TEXT(2, setup, "dtctfail"); 2129 dev_err(&ccwgdev->dev, 2130 "Detecting a network adapter for LCS devices" 2131 " failed with rc=%d (0x%x)\n", rc, rc); 2132 lcs_stopcard(card); 2133 goto out; 2134 } 2135 if (card->dev) { 2136 LCS_DBF_TEXT(2, setup, "samedev"); 2137 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2138 goto netdev_out; 2139 } 2140 switch (card->lan_type) { 2141 #ifdef CONFIG_ETHERNET 2142 case LCS_FRAME_TYPE_ENET: 2143 card->lan_type_trans = eth_type_trans; 2144 dev = alloc_etherdev(0); 2145 break; 2146 #endif 2147 #ifdef CONFIG_FDDI 2148 case LCS_FRAME_TYPE_FDDI: 2149 card->lan_type_trans = fddi_type_trans; 2150 dev = alloc_fddidev(0); 2151 break; 2152 #endif 2153 default: 2154 LCS_DBF_TEXT(3, setup, "errinit"); 2155 pr_err(" Initialization failed\n"); 2156 goto out; 2157 } 2158 if (!dev) 2159 goto out; 2160 card->dev = dev; 2161 card->dev->ml_priv = card; 2162 card->dev->netdev_ops = &lcs_netdev_ops; 2163 card->dev->dev_port = card->portno; 2164 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH); 2165 #ifdef CONFIG_IP_MULTICAST 2166 if (!lcs_check_multicast_support(card)) 2167 card->dev->netdev_ops = &lcs_mc_netdev_ops; 2168 #endif 2169 netdev_out: 2170 lcs_set_allowed_threads(card,0xffffffff); 2171 if (recover_state == DEV_STATE_RECOVER) { 2172 lcs_set_multicast_list(card->dev); 2173 card->dev->flags |= IFF_UP; 2174 netif_carrier_on(card->dev); 2175 netif_wake_queue(card->dev); 2176 card->state = DEV_STATE_UP; 2177 } else { 2178 lcs_stopcard(card); 2179 } 2180 2181 if (lcs_register_netdev(ccwgdev) != 0) 2182 goto out; 2183 2184 /* Print out supported assists: IPv6 */ 2185 pr_info("LCS device %s %s IPv6 support\n", card->dev->name, 2186 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ? 2187 "with" : "without"); 2188 /* Print out supported assist: Multicast */ 2189 pr_info("LCS device %s %s Multicast support\n", card->dev->name, 2190 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ? 2191 "with" : "without"); 2192 return 0; 2193 out: 2194 2195 ccw_device_set_offline(card->write.ccwdev); 2196 out_werr: 2197 ccw_device_set_offline(card->read.ccwdev); 2198 out_err: 2199 return -ENODEV; 2200 } 2201 2202 /** 2203 * lcs_shutdown_device, called when setting the group device offline. 2204 */ 2205 static int 2206 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode) 2207 { 2208 struct lcs_card *card; 2209 enum lcs_dev_states recover_state; 2210 int ret = 0, ret2 = 0, ret3 = 0; 2211 2212 LCS_DBF_TEXT(3, setup, "shtdndev"); 2213 card = dev_get_drvdata(&ccwgdev->dev); 2214 if (!card) 2215 return -ENODEV; 2216 if (recovery_mode == 0) { 2217 lcs_set_allowed_threads(card, 0); 2218 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD)) 2219 return -ERESTARTSYS; 2220 } 2221 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2222 recover_state = card->state; 2223 2224 ret = lcs_stop_device(card->dev); 2225 ret2 = ccw_device_set_offline(card->read.ccwdev); 2226 ret3 = ccw_device_set_offline(card->write.ccwdev); 2227 if (!ret) 2228 ret = (ret2) ? ret2 : ret3; 2229 if (ret) 2230 LCS_DBF_TEXT_(3, setup, "1err:%d", ret); 2231 if (recover_state == DEV_STATE_UP) { 2232 card->state = DEV_STATE_RECOVER; 2233 } 2234 return 0; 2235 } 2236 2237 static int 2238 lcs_shutdown_device(struct ccwgroup_device *ccwgdev) 2239 { 2240 return __lcs_shutdown_device(ccwgdev, 0); 2241 } 2242 2243 /** 2244 * drive lcs recovery after startup and startlan initiated by Lan Gateway 2245 */ 2246 static int 2247 lcs_recovery(void *ptr) 2248 { 2249 struct lcs_card *card; 2250 struct ccwgroup_device *gdev; 2251 int rc; 2252 2253 card = (struct lcs_card *) ptr; 2254 2255 LCS_DBF_TEXT(4, trace, "recover1"); 2256 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD)) 2257 return 0; 2258 LCS_DBF_TEXT(4, trace, "recover2"); 2259 gdev = card->gdev; 2260 dev_warn(&gdev->dev, 2261 "A recovery process has been started for the LCS device\n"); 2262 rc = __lcs_shutdown_device(gdev, 1); 2263 rc = lcs_new_device(gdev); 2264 if (!rc) 2265 pr_info("Device %s successfully recovered!\n", 2266 card->dev->name); 2267 else 2268 pr_info("Device %s could not be recovered!\n", 2269 card->dev->name); 2270 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD); 2271 return 0; 2272 } 2273 2274 /** 2275 * lcs_remove_device, free buffers and card 2276 */ 2277 static void 2278 lcs_remove_device(struct ccwgroup_device *ccwgdev) 2279 { 2280 struct lcs_card *card; 2281 2282 card = dev_get_drvdata(&ccwgdev->dev); 2283 if (!card) 2284 return; 2285 2286 LCS_DBF_TEXT(3, setup, "remdev"); 2287 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2288 if (ccwgdev->state == CCWGROUP_ONLINE) { 2289 lcs_shutdown_device(ccwgdev); 2290 } 2291 if (card->dev) 2292 unregister_netdev(card->dev); 2293 lcs_cleanup_card(card); 2294 lcs_free_card(card); 2295 dev_set_drvdata(&ccwgdev->dev, NULL); 2296 put_device(&ccwgdev->dev); 2297 } 2298 2299 static int lcs_pm_suspend(struct lcs_card *card) 2300 { 2301 if (card->dev) 2302 netif_device_detach(card->dev); 2303 lcs_set_allowed_threads(card, 0); 2304 lcs_wait_for_threads(card, 0xffffffff); 2305 if (card->state != DEV_STATE_DOWN) 2306 __lcs_shutdown_device(card->gdev, 1); 2307 return 0; 2308 } 2309 2310 static int lcs_pm_resume(struct lcs_card *card) 2311 { 2312 int rc = 0; 2313 2314 if (card->state == DEV_STATE_RECOVER) 2315 rc = lcs_new_device(card->gdev); 2316 if (card->dev) 2317 netif_device_attach(card->dev); 2318 if (rc) { 2319 dev_warn(&card->gdev->dev, "The lcs device driver " 2320 "failed to recover the device\n"); 2321 } 2322 return rc; 2323 } 2324 2325 static int lcs_prepare(struct ccwgroup_device *gdev) 2326 { 2327 return 0; 2328 } 2329 2330 static void lcs_complete(struct ccwgroup_device *gdev) 2331 { 2332 return; 2333 } 2334 2335 static int lcs_freeze(struct ccwgroup_device *gdev) 2336 { 2337 struct lcs_card *card = dev_get_drvdata(&gdev->dev); 2338 return lcs_pm_suspend(card); 2339 } 2340 2341 static int lcs_thaw(struct ccwgroup_device *gdev) 2342 { 2343 struct lcs_card *card = dev_get_drvdata(&gdev->dev); 2344 return lcs_pm_resume(card); 2345 } 2346 2347 static int lcs_restore(struct ccwgroup_device *gdev) 2348 { 2349 struct lcs_card *card = dev_get_drvdata(&gdev->dev); 2350 return lcs_pm_resume(card); 2351 } 2352 2353 static struct ccw_device_id lcs_ids[] = { 2354 {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel}, 2355 {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216}, 2356 {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2}, 2357 {}, 2358 }; 2359 MODULE_DEVICE_TABLE(ccw, lcs_ids); 2360 2361 static struct ccw_driver lcs_ccw_driver = { 2362 .driver = { 2363 .owner = THIS_MODULE, 2364 .name = "lcs", 2365 }, 2366 .ids = lcs_ids, 2367 .probe = ccwgroup_probe_ccwdev, 2368 .remove = ccwgroup_remove_ccwdev, 2369 .int_class = IRQIO_LCS, 2370 }; 2371 2372 /** 2373 * LCS ccwgroup driver registration 2374 */ 2375 static struct ccwgroup_driver lcs_group_driver = { 2376 .driver = { 2377 .owner = THIS_MODULE, 2378 .name = "lcs", 2379 }, 2380 .ccw_driver = &lcs_ccw_driver, 2381 .setup = lcs_probe_device, 2382 .remove = lcs_remove_device, 2383 .set_online = lcs_new_device, 2384 .set_offline = lcs_shutdown_device, 2385 .prepare = lcs_prepare, 2386 .complete = lcs_complete, 2387 .freeze = lcs_freeze, 2388 .thaw = lcs_thaw, 2389 .restore = lcs_restore, 2390 }; 2391 2392 static ssize_t group_store(struct device_driver *ddrv, const char *buf, 2393 size_t count) 2394 { 2395 int err; 2396 err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf); 2397 return err ? err : count; 2398 } 2399 static DRIVER_ATTR_WO(group); 2400 2401 static struct attribute *lcs_drv_attrs[] = { 2402 &driver_attr_group.attr, 2403 NULL, 2404 }; 2405 static struct attribute_group lcs_drv_attr_group = { 2406 .attrs = lcs_drv_attrs, 2407 }; 2408 static const struct attribute_group *lcs_drv_attr_groups[] = { 2409 &lcs_drv_attr_group, 2410 NULL, 2411 }; 2412 2413 /** 2414 * LCS Module/Kernel initialization function 2415 */ 2416 static int 2417 __init lcs_init_module(void) 2418 { 2419 int rc; 2420 2421 pr_info("Loading %s\n", version); 2422 rc = lcs_register_debug_facility(); 2423 LCS_DBF_TEXT(0, setup, "lcsinit"); 2424 if (rc) 2425 goto out_err; 2426 lcs_root_dev = root_device_register("lcs"); 2427 rc = PTR_ERR_OR_ZERO(lcs_root_dev); 2428 if (rc) 2429 goto register_err; 2430 rc = ccw_driver_register(&lcs_ccw_driver); 2431 if (rc) 2432 goto ccw_err; 2433 lcs_group_driver.driver.groups = lcs_drv_attr_groups; 2434 rc = ccwgroup_driver_register(&lcs_group_driver); 2435 if (rc) 2436 goto ccwgroup_err; 2437 return 0; 2438 2439 ccwgroup_err: 2440 ccw_driver_unregister(&lcs_ccw_driver); 2441 ccw_err: 2442 root_device_unregister(lcs_root_dev); 2443 register_err: 2444 lcs_unregister_debug_facility(); 2445 out_err: 2446 pr_err("Initializing the lcs device driver failed\n"); 2447 return rc; 2448 } 2449 2450 2451 /** 2452 * LCS module cleanup function 2453 */ 2454 static void 2455 __exit lcs_cleanup_module(void) 2456 { 2457 pr_info("Terminating lcs module.\n"); 2458 LCS_DBF_TEXT(0, trace, "cleanup"); 2459 ccwgroup_driver_unregister(&lcs_group_driver); 2460 ccw_driver_unregister(&lcs_ccw_driver); 2461 root_device_unregister(lcs_root_dev); 2462 lcs_unregister_debug_facility(); 2463 } 2464 2465 module_init(lcs_init_module); 2466 module_exit(lcs_cleanup_module); 2467 2468 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>"); 2469 MODULE_LICENSE("GPL"); 2470 2471