1 /* 2 * linux/drivers/s390/net/lcs.c 3 * 4 * Linux for S/390 Lan Channel Station Network Driver 5 * 6 * Copyright (C) 1999-2001 IBM Deutschland Entwicklung GmbH, 7 * IBM Corporation 8 * Author(s): Original Code written by 9 * DJ Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) 10 * Rewritten by 11 * Frank Pavlic (fpavlic@de.ibm.com) and 12 * Martin Schwidefsky <schwidefsky@de.ibm.com> 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 * GNU General Public License for more details. 23 * 24 * You should have received a copy of the GNU General Public License 25 * along with this program; if not, write to the Free Software 26 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 27 */ 28 29 #include <linux/module.h> 30 #include <linux/if.h> 31 #include <linux/netdevice.h> 32 #include <linux/etherdevice.h> 33 #include <linux/trdevice.h> 34 #include <linux/fddidevice.h> 35 #include <linux/inetdevice.h> 36 #include <linux/in.h> 37 #include <linux/igmp.h> 38 #include <linux/delay.h> 39 #include <net/arp.h> 40 #include <net/ip.h> 41 42 #include <asm/debug.h> 43 #include <asm/idals.h> 44 #include <asm/timex.h> 45 #include <linux/device.h> 46 #include <asm/ccwgroup.h> 47 48 #include "lcs.h" 49 #include "cu3088.h" 50 51 52 #if !defined(CONFIG_NET_ETHERNET) && \ 53 !defined(CONFIG_TR) && !defined(CONFIG_FDDI) 54 #error Cannot compile lcs.c without some net devices switched on. 55 #endif 56 57 #define PRINTK_HEADER " lcs: " 58 59 /** 60 * initialization string for output 61 */ 62 63 static char version[] __initdata = "LCS driver"; 64 static char debug_buffer[255]; 65 66 /** 67 * Some prototypes. 68 */ 69 static void lcs_tasklet(unsigned long); 70 static void lcs_start_kernel_thread(struct work_struct *); 71 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *); 72 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *); 73 static int lcs_recovery(void *ptr); 74 75 /** 76 * Debug Facility Stuff 77 */ 78 static debug_info_t *lcs_dbf_setup; 79 static debug_info_t *lcs_dbf_trace; 80 81 /** 82 * LCS Debug Facility functions 83 */ 84 static void 85 lcs_unregister_debug_facility(void) 86 { 87 if (lcs_dbf_setup) 88 debug_unregister(lcs_dbf_setup); 89 if (lcs_dbf_trace) 90 debug_unregister(lcs_dbf_trace); 91 } 92 93 static int 94 lcs_register_debug_facility(void) 95 { 96 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8); 97 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8); 98 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) { 99 PRINT_ERR("Not enough memory for debug facility.\n"); 100 lcs_unregister_debug_facility(); 101 return -ENOMEM; 102 } 103 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view); 104 debug_set_level(lcs_dbf_setup, 2); 105 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view); 106 debug_set_level(lcs_dbf_trace, 2); 107 return 0; 108 } 109 110 /** 111 * Allocate io buffers. 112 */ 113 static int 114 lcs_alloc_channel(struct lcs_channel *channel) 115 { 116 int cnt; 117 118 LCS_DBF_TEXT(2, setup, "ichalloc"); 119 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) { 120 /* alloc memory fo iobuffer */ 121 channel->iob[cnt].data = 122 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL); 123 if (channel->iob[cnt].data == NULL) 124 break; 125 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY; 126 } 127 if (cnt < LCS_NUM_BUFFS) { 128 /* Not all io buffers could be allocated. */ 129 LCS_DBF_TEXT(2, setup, "echalloc"); 130 while (cnt-- > 0) 131 kfree(channel->iob[cnt].data); 132 return -ENOMEM; 133 } 134 return 0; 135 } 136 137 /** 138 * Free io buffers. 139 */ 140 static void 141 lcs_free_channel(struct lcs_channel *channel) 142 { 143 int cnt; 144 145 LCS_DBF_TEXT(2, setup, "ichfree"); 146 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) { 147 kfree(channel->iob[cnt].data); 148 channel->iob[cnt].data = NULL; 149 } 150 } 151 152 /* 153 * Cleanup channel. 154 */ 155 static void 156 lcs_cleanup_channel(struct lcs_channel *channel) 157 { 158 LCS_DBF_TEXT(3, setup, "cleanch"); 159 /* Kill write channel tasklets. */ 160 tasklet_kill(&channel->irq_tasklet); 161 /* Free channel buffers. */ 162 lcs_free_channel(channel); 163 } 164 165 /** 166 * LCS free memory for card and channels. 167 */ 168 static void 169 lcs_free_card(struct lcs_card *card) 170 { 171 LCS_DBF_TEXT(2, setup, "remcard"); 172 LCS_DBF_HEX(2, setup, &card, sizeof(void*)); 173 kfree(card); 174 } 175 176 /** 177 * LCS alloc memory for card and channels 178 */ 179 static struct lcs_card * 180 lcs_alloc_card(void) 181 { 182 struct lcs_card *card; 183 int rc; 184 185 LCS_DBF_TEXT(2, setup, "alloclcs"); 186 187 card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA); 188 if (card == NULL) 189 return NULL; 190 card->lan_type = LCS_FRAME_TYPE_AUTO; 191 card->pkt_seq = 0; 192 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT; 193 /* Allocate io buffers for the read channel. */ 194 rc = lcs_alloc_channel(&card->read); 195 if (rc){ 196 LCS_DBF_TEXT(2, setup, "iccwerr"); 197 lcs_free_card(card); 198 return NULL; 199 } 200 /* Allocate io buffers for the write channel. */ 201 rc = lcs_alloc_channel(&card->write); 202 if (rc) { 203 LCS_DBF_TEXT(2, setup, "iccwerr"); 204 lcs_cleanup_channel(&card->read); 205 lcs_free_card(card); 206 return NULL; 207 } 208 209 #ifdef CONFIG_IP_MULTICAST 210 INIT_LIST_HEAD(&card->ipm_list); 211 #endif 212 LCS_DBF_HEX(2, setup, &card, sizeof(void*)); 213 return card; 214 } 215 216 /* 217 * Setup read channel. 218 */ 219 static void 220 lcs_setup_read_ccws(struct lcs_card *card) 221 { 222 int cnt; 223 224 LCS_DBF_TEXT(2, setup, "ireadccw"); 225 /* Setup read ccws. */ 226 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1)); 227 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) { 228 card->read.ccws[cnt].cmd_code = LCS_CCW_READ; 229 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE; 230 card->read.ccws[cnt].flags = 231 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI; 232 /* 233 * Note: we have allocated the buffer with GFP_DMA, so 234 * we do not need to do set_normalized_cda. 235 */ 236 card->read.ccws[cnt].cda = 237 (__u32) __pa(card->read.iob[cnt].data); 238 ((struct lcs_header *) 239 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET; 240 card->read.iob[cnt].callback = lcs_get_frames_cb; 241 card->read.iob[cnt].state = LCS_BUF_STATE_READY; 242 card->read.iob[cnt].count = LCS_IOBUFFERSIZE; 243 } 244 card->read.ccws[0].flags &= ~CCW_FLAG_PCI; 245 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI; 246 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND; 247 /* Last ccw is a tic (transfer in channel). */ 248 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER; 249 card->read.ccws[LCS_NUM_BUFFS].cda = 250 (__u32) __pa(card->read.ccws); 251 /* Setg initial state of the read channel. */ 252 card->read.state = LCS_CH_STATE_INIT; 253 254 card->read.io_idx = 0; 255 card->read.buf_idx = 0; 256 } 257 258 static void 259 lcs_setup_read(struct lcs_card *card) 260 { 261 LCS_DBF_TEXT(3, setup, "initread"); 262 263 lcs_setup_read_ccws(card); 264 /* Initialize read channel tasklet. */ 265 card->read.irq_tasklet.data = (unsigned long) &card->read; 266 card->read.irq_tasklet.func = lcs_tasklet; 267 /* Initialize waitqueue. */ 268 init_waitqueue_head(&card->read.wait_q); 269 } 270 271 /* 272 * Setup write channel. 273 */ 274 static void 275 lcs_setup_write_ccws(struct lcs_card *card) 276 { 277 int cnt; 278 279 LCS_DBF_TEXT(3, setup, "iwritccw"); 280 /* Setup write ccws. */ 281 memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1); 282 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) { 283 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE; 284 card->write.ccws[cnt].count = 0; 285 card->write.ccws[cnt].flags = 286 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI; 287 /* 288 * Note: we have allocated the buffer with GFP_DMA, so 289 * we do not need to do set_normalized_cda. 290 */ 291 card->write.ccws[cnt].cda = 292 (__u32) __pa(card->write.iob[cnt].data); 293 } 294 /* Last ccw is a tic (transfer in channel). */ 295 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER; 296 card->write.ccws[LCS_NUM_BUFFS].cda = 297 (__u32) __pa(card->write.ccws); 298 /* Set initial state of the write channel. */ 299 card->read.state = LCS_CH_STATE_INIT; 300 301 card->write.io_idx = 0; 302 card->write.buf_idx = 0; 303 } 304 305 static void 306 lcs_setup_write(struct lcs_card *card) 307 { 308 LCS_DBF_TEXT(3, setup, "initwrit"); 309 310 lcs_setup_write_ccws(card); 311 /* Initialize write channel tasklet. */ 312 card->write.irq_tasklet.data = (unsigned long) &card->write; 313 card->write.irq_tasklet.func = lcs_tasklet; 314 /* Initialize waitqueue. */ 315 init_waitqueue_head(&card->write.wait_q); 316 } 317 318 static void 319 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads) 320 { 321 unsigned long flags; 322 323 spin_lock_irqsave(&card->mask_lock, flags); 324 card->thread_allowed_mask = threads; 325 spin_unlock_irqrestore(&card->mask_lock, flags); 326 wake_up(&card->wait_q); 327 } 328 static inline int 329 lcs_threads_running(struct lcs_card *card, unsigned long threads) 330 { 331 unsigned long flags; 332 int rc = 0; 333 334 spin_lock_irqsave(&card->mask_lock, flags); 335 rc = (card->thread_running_mask & threads); 336 spin_unlock_irqrestore(&card->mask_lock, flags); 337 return rc; 338 } 339 340 static int 341 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads) 342 { 343 return wait_event_interruptible(card->wait_q, 344 lcs_threads_running(card, threads) == 0); 345 } 346 347 static inline int 348 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread) 349 { 350 unsigned long flags; 351 352 spin_lock_irqsave(&card->mask_lock, flags); 353 if ( !(card->thread_allowed_mask & thread) || 354 (card->thread_start_mask & thread) ) { 355 spin_unlock_irqrestore(&card->mask_lock, flags); 356 return -EPERM; 357 } 358 card->thread_start_mask |= thread; 359 spin_unlock_irqrestore(&card->mask_lock, flags); 360 return 0; 361 } 362 363 static void 364 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread) 365 { 366 unsigned long flags; 367 368 spin_lock_irqsave(&card->mask_lock, flags); 369 card->thread_running_mask &= ~thread; 370 spin_unlock_irqrestore(&card->mask_lock, flags); 371 wake_up(&card->wait_q); 372 } 373 374 static inline int 375 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread) 376 { 377 unsigned long flags; 378 int rc = 0; 379 380 spin_lock_irqsave(&card->mask_lock, flags); 381 if (card->thread_start_mask & thread){ 382 if ((card->thread_allowed_mask & thread) && 383 !(card->thread_running_mask & thread)){ 384 rc = 1; 385 card->thread_start_mask &= ~thread; 386 card->thread_running_mask |= thread; 387 } else 388 rc = -EPERM; 389 } 390 spin_unlock_irqrestore(&card->mask_lock, flags); 391 return rc; 392 } 393 394 static int 395 lcs_do_run_thread(struct lcs_card *card, unsigned long thread) 396 { 397 int rc = 0; 398 wait_event(card->wait_q, 399 (rc = __lcs_do_run_thread(card, thread)) >= 0); 400 return rc; 401 } 402 403 static int 404 lcs_do_start_thread(struct lcs_card *card, unsigned long thread) 405 { 406 unsigned long flags; 407 int rc = 0; 408 409 spin_lock_irqsave(&card->mask_lock, flags); 410 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x", 411 (u8) card->thread_start_mask, 412 (u8) card->thread_allowed_mask, 413 (u8) card->thread_running_mask); 414 rc = (card->thread_start_mask & thread); 415 spin_unlock_irqrestore(&card->mask_lock, flags); 416 return rc; 417 } 418 419 /** 420 * Initialize channels,card and state machines. 421 */ 422 static void 423 lcs_setup_card(struct lcs_card *card) 424 { 425 LCS_DBF_TEXT(2, setup, "initcard"); 426 LCS_DBF_HEX(2, setup, &card, sizeof(void*)); 427 428 lcs_setup_read(card); 429 lcs_setup_write(card); 430 /* Set cards initial state. */ 431 card->state = DEV_STATE_DOWN; 432 card->tx_buffer = NULL; 433 card->tx_emitted = 0; 434 435 init_waitqueue_head(&card->wait_q); 436 spin_lock_init(&card->lock); 437 spin_lock_init(&card->ipm_lock); 438 spin_lock_init(&card->mask_lock); 439 #ifdef CONFIG_IP_MULTICAST 440 INIT_LIST_HEAD(&card->ipm_list); 441 #endif 442 INIT_LIST_HEAD(&card->lancmd_waiters); 443 } 444 445 static inline void 446 lcs_clear_multicast_list(struct lcs_card *card) 447 { 448 #ifdef CONFIG_IP_MULTICAST 449 struct lcs_ipm_list *ipm; 450 unsigned long flags; 451 452 /* Free multicast list. */ 453 LCS_DBF_TEXT(3, setup, "clmclist"); 454 spin_lock_irqsave(&card->ipm_lock, flags); 455 while (!list_empty(&card->ipm_list)){ 456 ipm = list_entry(card->ipm_list.next, 457 struct lcs_ipm_list, list); 458 list_del(&ipm->list); 459 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){ 460 spin_unlock_irqrestore(&card->ipm_lock, flags); 461 lcs_send_delipm(card, ipm); 462 spin_lock_irqsave(&card->ipm_lock, flags); 463 } 464 kfree(ipm); 465 } 466 spin_unlock_irqrestore(&card->ipm_lock, flags); 467 #endif 468 } 469 /** 470 * Cleanup channels,card and state machines. 471 */ 472 static void 473 lcs_cleanup_card(struct lcs_card *card) 474 { 475 476 LCS_DBF_TEXT(3, setup, "cleancrd"); 477 LCS_DBF_HEX(2,setup,&card,sizeof(void*)); 478 479 if (card->dev != NULL) 480 free_netdev(card->dev); 481 /* Cleanup channels. */ 482 lcs_cleanup_channel(&card->write); 483 lcs_cleanup_channel(&card->read); 484 } 485 486 /** 487 * Start channel. 488 */ 489 static int 490 lcs_start_channel(struct lcs_channel *channel) 491 { 492 unsigned long flags; 493 int rc; 494 495 LCS_DBF_TEXT_(4,trace,"ssch%s", channel->ccwdev->dev.bus_id); 496 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 497 rc = ccw_device_start(channel->ccwdev, 498 channel->ccws + channel->io_idx, 0, 0, 499 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND); 500 if (rc == 0) 501 channel->state = LCS_CH_STATE_RUNNING; 502 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 503 if (rc) { 504 LCS_DBF_TEXT_(4,trace,"essh%s", channel->ccwdev->dev.bus_id); 505 PRINT_ERR("Error in starting channel, rc=%d!\n", rc); 506 } 507 return rc; 508 } 509 510 static int 511 lcs_clear_channel(struct lcs_channel *channel) 512 { 513 unsigned long flags; 514 int rc; 515 516 LCS_DBF_TEXT(4,trace,"clearch"); 517 LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id); 518 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 519 rc = ccw_device_clear(channel->ccwdev, (addr_t) channel); 520 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 521 if (rc) { 522 LCS_DBF_TEXT_(4,trace,"ecsc%s", channel->ccwdev->dev.bus_id); 523 return rc; 524 } 525 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED)); 526 channel->state = LCS_CH_STATE_STOPPED; 527 return rc; 528 } 529 530 531 /** 532 * Stop channel. 533 */ 534 static int 535 lcs_stop_channel(struct lcs_channel *channel) 536 { 537 unsigned long flags; 538 int rc; 539 540 if (channel->state == LCS_CH_STATE_STOPPED) 541 return 0; 542 LCS_DBF_TEXT(4,trace,"haltsch"); 543 LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id); 544 channel->state = LCS_CH_STATE_INIT; 545 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 546 rc = ccw_device_halt(channel->ccwdev, (addr_t) channel); 547 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 548 if (rc) { 549 LCS_DBF_TEXT_(4,trace,"ehsc%s", channel->ccwdev->dev.bus_id); 550 return rc; 551 } 552 /* Asynchronous halt initialted. Wait for its completion. */ 553 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED)); 554 lcs_clear_channel(channel); 555 return 0; 556 } 557 558 /** 559 * start read and write channel 560 */ 561 static int 562 lcs_start_channels(struct lcs_card *card) 563 { 564 int rc; 565 566 LCS_DBF_TEXT(2, trace, "chstart"); 567 /* start read channel */ 568 rc = lcs_start_channel(&card->read); 569 if (rc) 570 return rc; 571 /* start write channel */ 572 rc = lcs_start_channel(&card->write); 573 if (rc) 574 lcs_stop_channel(&card->read); 575 return rc; 576 } 577 578 /** 579 * stop read and write channel 580 */ 581 static int 582 lcs_stop_channels(struct lcs_card *card) 583 { 584 LCS_DBF_TEXT(2, trace, "chhalt"); 585 lcs_stop_channel(&card->read); 586 lcs_stop_channel(&card->write); 587 return 0; 588 } 589 590 /** 591 * Get empty buffer. 592 */ 593 static struct lcs_buffer * 594 __lcs_get_buffer(struct lcs_channel *channel) 595 { 596 int index; 597 598 LCS_DBF_TEXT(5, trace, "_getbuff"); 599 index = channel->io_idx; 600 do { 601 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) { 602 channel->iob[index].state = LCS_BUF_STATE_LOCKED; 603 return channel->iob + index; 604 } 605 index = (index + 1) & (LCS_NUM_BUFFS - 1); 606 } while (index != channel->io_idx); 607 return NULL; 608 } 609 610 static struct lcs_buffer * 611 lcs_get_buffer(struct lcs_channel *channel) 612 { 613 struct lcs_buffer *buffer; 614 unsigned long flags; 615 616 LCS_DBF_TEXT(5, trace, "getbuff"); 617 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 618 buffer = __lcs_get_buffer(channel); 619 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 620 return buffer; 621 } 622 623 /** 624 * Resume channel program if the channel is suspended. 625 */ 626 static int 627 __lcs_resume_channel(struct lcs_channel *channel) 628 { 629 int rc; 630 631 if (channel->state != LCS_CH_STATE_SUSPENDED) 632 return 0; 633 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND) 634 return 0; 635 LCS_DBF_TEXT_(5, trace, "rsch%s", channel->ccwdev->dev.bus_id); 636 rc = ccw_device_resume(channel->ccwdev); 637 if (rc) { 638 LCS_DBF_TEXT_(4, trace, "ersc%s", channel->ccwdev->dev.bus_id); 639 PRINT_ERR("Error in lcs_resume_channel: rc=%d\n",rc); 640 } else 641 channel->state = LCS_CH_STATE_RUNNING; 642 return rc; 643 644 } 645 646 /** 647 * Make a buffer ready for processing. 648 */ 649 static inline void 650 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index) 651 { 652 int prev, next; 653 654 LCS_DBF_TEXT(5, trace, "rdybits"); 655 prev = (index - 1) & (LCS_NUM_BUFFS - 1); 656 next = (index + 1) & (LCS_NUM_BUFFS - 1); 657 /* Check if we may clear the suspend bit of this buffer. */ 658 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) { 659 /* Check if we have to set the PCI bit. */ 660 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND)) 661 /* Suspend bit of the previous buffer is not set. */ 662 channel->ccws[index].flags |= CCW_FLAG_PCI; 663 /* Suspend bit of the next buffer is set. */ 664 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND; 665 } 666 } 667 668 static int 669 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer) 670 { 671 unsigned long flags; 672 int index, rc; 673 674 LCS_DBF_TEXT(5, trace, "rdybuff"); 675 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED && 676 buffer->state != LCS_BUF_STATE_PROCESSED); 677 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 678 buffer->state = LCS_BUF_STATE_READY; 679 index = buffer - channel->iob; 680 /* Set length. */ 681 channel->ccws[index].count = buffer->count; 682 /* Check relevant PCI/suspend bits. */ 683 __lcs_ready_buffer_bits(channel, index); 684 rc = __lcs_resume_channel(channel); 685 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 686 return rc; 687 } 688 689 /** 690 * Mark the buffer as processed. Take care of the suspend bit 691 * of the previous buffer. This function is called from 692 * interrupt context, so the lock must not be taken. 693 */ 694 static int 695 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer) 696 { 697 int index, prev, next; 698 699 LCS_DBF_TEXT(5, trace, "prcsbuff"); 700 BUG_ON(buffer->state != LCS_BUF_STATE_READY); 701 buffer->state = LCS_BUF_STATE_PROCESSED; 702 index = buffer - channel->iob; 703 prev = (index - 1) & (LCS_NUM_BUFFS - 1); 704 next = (index + 1) & (LCS_NUM_BUFFS - 1); 705 /* Set the suspend bit and clear the PCI bit of this buffer. */ 706 channel->ccws[index].flags |= CCW_FLAG_SUSPEND; 707 channel->ccws[index].flags &= ~CCW_FLAG_PCI; 708 /* Check the suspend bit of the previous buffer. */ 709 if (channel->iob[prev].state == LCS_BUF_STATE_READY) { 710 /* 711 * Previous buffer is in state ready. It might have 712 * happened in lcs_ready_buffer that the suspend bit 713 * has not been cleared to avoid an endless loop. 714 * Do it now. 715 */ 716 __lcs_ready_buffer_bits(channel, prev); 717 } 718 /* Clear PCI bit of next buffer. */ 719 channel->ccws[next].flags &= ~CCW_FLAG_PCI; 720 return __lcs_resume_channel(channel); 721 } 722 723 /** 724 * Put a processed buffer back to state empty. 725 */ 726 static void 727 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer) 728 { 729 unsigned long flags; 730 731 LCS_DBF_TEXT(5, trace, "relbuff"); 732 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED && 733 buffer->state != LCS_BUF_STATE_PROCESSED); 734 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 735 buffer->state = LCS_BUF_STATE_EMPTY; 736 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 737 } 738 739 /** 740 * Get buffer for a lan command. 741 */ 742 static struct lcs_buffer * 743 lcs_get_lancmd(struct lcs_card *card, int count) 744 { 745 struct lcs_buffer *buffer; 746 struct lcs_cmd *cmd; 747 748 LCS_DBF_TEXT(4, trace, "getlncmd"); 749 /* Get buffer and wait if none is available. */ 750 wait_event(card->write.wait_q, 751 ((buffer = lcs_get_buffer(&card->write)) != NULL)); 752 count += sizeof(struct lcs_header); 753 *(__u16 *)(buffer->data + count) = 0; 754 buffer->count = count + sizeof(__u16); 755 buffer->callback = lcs_release_buffer; 756 cmd = (struct lcs_cmd *) buffer->data; 757 cmd->offset = count; 758 cmd->type = LCS_FRAME_TYPE_CONTROL; 759 cmd->slot = 0; 760 return buffer; 761 } 762 763 764 static void 765 lcs_get_reply(struct lcs_reply *reply) 766 { 767 WARN_ON(atomic_read(&reply->refcnt) <= 0); 768 atomic_inc(&reply->refcnt); 769 } 770 771 static void 772 lcs_put_reply(struct lcs_reply *reply) 773 { 774 WARN_ON(atomic_read(&reply->refcnt) <= 0); 775 if (atomic_dec_and_test(&reply->refcnt)) { 776 kfree(reply); 777 } 778 779 } 780 781 static struct lcs_reply * 782 lcs_alloc_reply(struct lcs_cmd *cmd) 783 { 784 struct lcs_reply *reply; 785 786 LCS_DBF_TEXT(4, trace, "getreply"); 787 788 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC); 789 if (!reply) 790 return NULL; 791 atomic_set(&reply->refcnt,1); 792 reply->sequence_no = cmd->sequence_no; 793 reply->received = 0; 794 reply->rc = 0; 795 init_waitqueue_head(&reply->wait_q); 796 797 return reply; 798 } 799 800 /** 801 * Notifier function for lancmd replies. Called from read irq. 802 */ 803 static void 804 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd) 805 { 806 struct list_head *l, *n; 807 struct lcs_reply *reply; 808 809 LCS_DBF_TEXT(4, trace, "notiwait"); 810 spin_lock(&card->lock); 811 list_for_each_safe(l, n, &card->lancmd_waiters) { 812 reply = list_entry(l, struct lcs_reply, list); 813 if (reply->sequence_no == cmd->sequence_no) { 814 lcs_get_reply(reply); 815 list_del_init(&reply->list); 816 if (reply->callback != NULL) 817 reply->callback(card, cmd); 818 reply->received = 1; 819 reply->rc = cmd->return_code; 820 wake_up(&reply->wait_q); 821 lcs_put_reply(reply); 822 break; 823 } 824 } 825 spin_unlock(&card->lock); 826 } 827 828 /** 829 * Emit buffer of a lan comand. 830 */ 831 static void 832 lcs_lancmd_timeout(unsigned long data) 833 { 834 struct lcs_reply *reply, *list_reply, *r; 835 unsigned long flags; 836 837 LCS_DBF_TEXT(4, trace, "timeout"); 838 reply = (struct lcs_reply *) data; 839 spin_lock_irqsave(&reply->card->lock, flags); 840 list_for_each_entry_safe(list_reply, r, 841 &reply->card->lancmd_waiters,list) { 842 if (reply == list_reply) { 843 lcs_get_reply(reply); 844 list_del_init(&reply->list); 845 spin_unlock_irqrestore(&reply->card->lock, flags); 846 reply->received = 1; 847 reply->rc = -ETIME; 848 wake_up(&reply->wait_q); 849 lcs_put_reply(reply); 850 return; 851 } 852 } 853 spin_unlock_irqrestore(&reply->card->lock, flags); 854 } 855 856 static int 857 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer, 858 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *)) 859 { 860 struct lcs_reply *reply; 861 struct lcs_cmd *cmd; 862 struct timer_list timer; 863 unsigned long flags; 864 int rc; 865 866 LCS_DBF_TEXT(4, trace, "sendcmd"); 867 cmd = (struct lcs_cmd *) buffer->data; 868 cmd->return_code = 0; 869 cmd->sequence_no = card->sequence_no++; 870 reply = lcs_alloc_reply(cmd); 871 if (!reply) 872 return -ENOMEM; 873 reply->callback = reply_callback; 874 reply->card = card; 875 spin_lock_irqsave(&card->lock, flags); 876 list_add_tail(&reply->list, &card->lancmd_waiters); 877 spin_unlock_irqrestore(&card->lock, flags); 878 879 buffer->callback = lcs_release_buffer; 880 rc = lcs_ready_buffer(&card->write, buffer); 881 if (rc) 882 return rc; 883 init_timer(&timer); 884 timer.function = lcs_lancmd_timeout; 885 timer.data = (unsigned long) reply; 886 timer.expires = jiffies + HZ*card->lancmd_timeout; 887 add_timer(&timer); 888 wait_event(reply->wait_q, reply->received); 889 del_timer_sync(&timer); 890 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc); 891 rc = reply->rc; 892 lcs_put_reply(reply); 893 return rc ? -EIO : 0; 894 } 895 896 /** 897 * LCS startup command 898 */ 899 static int 900 lcs_send_startup(struct lcs_card *card, __u8 initiator) 901 { 902 struct lcs_buffer *buffer; 903 struct lcs_cmd *cmd; 904 905 LCS_DBF_TEXT(2, trace, "startup"); 906 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 907 cmd = (struct lcs_cmd *) buffer->data; 908 cmd->cmd_code = LCS_CMD_STARTUP; 909 cmd->initiator = initiator; 910 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE; 911 return lcs_send_lancmd(card, buffer, NULL); 912 } 913 914 /** 915 * LCS shutdown command 916 */ 917 static int 918 lcs_send_shutdown(struct lcs_card *card) 919 { 920 struct lcs_buffer *buffer; 921 struct lcs_cmd *cmd; 922 923 LCS_DBF_TEXT(2, trace, "shutdown"); 924 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 925 cmd = (struct lcs_cmd *) buffer->data; 926 cmd->cmd_code = LCS_CMD_SHUTDOWN; 927 cmd->initiator = LCS_INITIATOR_TCPIP; 928 return lcs_send_lancmd(card, buffer, NULL); 929 } 930 931 /** 932 * LCS lanstat command 933 */ 934 static void 935 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd) 936 { 937 LCS_DBF_TEXT(2, trace, "statcb"); 938 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH); 939 } 940 941 static int 942 lcs_send_lanstat(struct lcs_card *card) 943 { 944 struct lcs_buffer *buffer; 945 struct lcs_cmd *cmd; 946 947 LCS_DBF_TEXT(2,trace, "cmdstat"); 948 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 949 cmd = (struct lcs_cmd *) buffer->data; 950 /* Setup lanstat command. */ 951 cmd->cmd_code = LCS_CMD_LANSTAT; 952 cmd->initiator = LCS_INITIATOR_TCPIP; 953 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type; 954 cmd->cmd.lcs_std_cmd.portno = card->portno; 955 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb); 956 } 957 958 /** 959 * send stoplan command 960 */ 961 static int 962 lcs_send_stoplan(struct lcs_card *card, __u8 initiator) 963 { 964 struct lcs_buffer *buffer; 965 struct lcs_cmd *cmd; 966 967 LCS_DBF_TEXT(2, trace, "cmdstpln"); 968 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 969 cmd = (struct lcs_cmd *) buffer->data; 970 cmd->cmd_code = LCS_CMD_STOPLAN; 971 cmd->initiator = initiator; 972 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type; 973 cmd->cmd.lcs_std_cmd.portno = card->portno; 974 return lcs_send_lancmd(card, buffer, NULL); 975 } 976 977 /** 978 * send startlan command 979 */ 980 static void 981 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd) 982 { 983 LCS_DBF_TEXT(2, trace, "srtlancb"); 984 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type; 985 card->portno = cmd->cmd.lcs_std_cmd.portno; 986 } 987 988 static int 989 lcs_send_startlan(struct lcs_card *card, __u8 initiator) 990 { 991 struct lcs_buffer *buffer; 992 struct lcs_cmd *cmd; 993 994 LCS_DBF_TEXT(2, trace, "cmdstaln"); 995 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 996 cmd = (struct lcs_cmd *) buffer->data; 997 cmd->cmd_code = LCS_CMD_STARTLAN; 998 cmd->initiator = initiator; 999 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type; 1000 cmd->cmd.lcs_std_cmd.portno = card->portno; 1001 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb); 1002 } 1003 1004 #ifdef CONFIG_IP_MULTICAST 1005 /** 1006 * send setipm command (Multicast) 1007 */ 1008 static int 1009 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list) 1010 { 1011 struct lcs_buffer *buffer; 1012 struct lcs_cmd *cmd; 1013 1014 LCS_DBF_TEXT(2, trace, "cmdsetim"); 1015 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE); 1016 cmd = (struct lcs_cmd *) buffer->data; 1017 cmd->cmd_code = LCS_CMD_SETIPM; 1018 cmd->initiator = LCS_INITIATOR_TCPIP; 1019 cmd->cmd.lcs_qipassist.lan_type = card->lan_type; 1020 cmd->cmd.lcs_qipassist.portno = card->portno; 1021 cmd->cmd.lcs_qipassist.version = 4; 1022 cmd->cmd.lcs_qipassist.num_ip_pairs = 1; 1023 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair, 1024 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair)); 1025 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr); 1026 return lcs_send_lancmd(card, buffer, NULL); 1027 } 1028 1029 /** 1030 * send delipm command (Multicast) 1031 */ 1032 static int 1033 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list) 1034 { 1035 struct lcs_buffer *buffer; 1036 struct lcs_cmd *cmd; 1037 1038 LCS_DBF_TEXT(2, trace, "cmddelim"); 1039 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE); 1040 cmd = (struct lcs_cmd *) buffer->data; 1041 cmd->cmd_code = LCS_CMD_DELIPM; 1042 cmd->initiator = LCS_INITIATOR_TCPIP; 1043 cmd->cmd.lcs_qipassist.lan_type = card->lan_type; 1044 cmd->cmd.lcs_qipassist.portno = card->portno; 1045 cmd->cmd.lcs_qipassist.version = 4; 1046 cmd->cmd.lcs_qipassist.num_ip_pairs = 1; 1047 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair, 1048 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair)); 1049 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr); 1050 return lcs_send_lancmd(card, buffer, NULL); 1051 } 1052 1053 /** 1054 * check if multicast is supported by LCS 1055 */ 1056 static void 1057 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd) 1058 { 1059 LCS_DBF_TEXT(2, trace, "chkmccb"); 1060 card->ip_assists_supported = 1061 cmd->cmd.lcs_qipassist.ip_assists_supported; 1062 card->ip_assists_enabled = 1063 cmd->cmd.lcs_qipassist.ip_assists_enabled; 1064 } 1065 1066 static int 1067 lcs_check_multicast_support(struct lcs_card *card) 1068 { 1069 struct lcs_buffer *buffer; 1070 struct lcs_cmd *cmd; 1071 int rc; 1072 1073 LCS_DBF_TEXT(2, trace, "cmdqipa"); 1074 /* Send query ipassist. */ 1075 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); 1076 cmd = (struct lcs_cmd *) buffer->data; 1077 cmd->cmd_code = LCS_CMD_QIPASSIST; 1078 cmd->initiator = LCS_INITIATOR_TCPIP; 1079 cmd->cmd.lcs_qipassist.lan_type = card->lan_type; 1080 cmd->cmd.lcs_qipassist.portno = card->portno; 1081 cmd->cmd.lcs_qipassist.version = 4; 1082 cmd->cmd.lcs_qipassist.num_ip_pairs = 1; 1083 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb); 1084 if (rc != 0) { 1085 PRINT_ERR("Query IPAssist failed. Assuming unsupported!\n"); 1086 return -EOPNOTSUPP; 1087 } 1088 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) 1089 return 0; 1090 return -EOPNOTSUPP; 1091 } 1092 1093 /** 1094 * set or del multicast address on LCS card 1095 */ 1096 static void 1097 lcs_fix_multicast_list(struct lcs_card *card) 1098 { 1099 struct list_head failed_list; 1100 struct lcs_ipm_list *ipm, *tmp; 1101 unsigned long flags; 1102 int rc; 1103 1104 LCS_DBF_TEXT(4,trace, "fixipm"); 1105 INIT_LIST_HEAD(&failed_list); 1106 spin_lock_irqsave(&card->ipm_lock, flags); 1107 list_modified: 1108 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){ 1109 switch (ipm->ipm_state) { 1110 case LCS_IPM_STATE_SET_REQUIRED: 1111 /* del from ipm_list so noone else can tamper with 1112 * this entry */ 1113 list_del_init(&ipm->list); 1114 spin_unlock_irqrestore(&card->ipm_lock, flags); 1115 rc = lcs_send_setipm(card, ipm); 1116 spin_lock_irqsave(&card->ipm_lock, flags); 1117 if (rc) { 1118 PRINT_INFO("Adding multicast address failed. " 1119 "Table possibly full!\n"); 1120 /* store ipm in failed list -> will be added 1121 * to ipm_list again, so a retry will be done 1122 * during the next call of this function */ 1123 list_add_tail(&ipm->list, &failed_list); 1124 } else { 1125 ipm->ipm_state = LCS_IPM_STATE_ON_CARD; 1126 /* re-insert into ipm_list */ 1127 list_add_tail(&ipm->list, &card->ipm_list); 1128 } 1129 goto list_modified; 1130 case LCS_IPM_STATE_DEL_REQUIRED: 1131 list_del(&ipm->list); 1132 spin_unlock_irqrestore(&card->ipm_lock, flags); 1133 lcs_send_delipm(card, ipm); 1134 spin_lock_irqsave(&card->ipm_lock, flags); 1135 kfree(ipm); 1136 goto list_modified; 1137 case LCS_IPM_STATE_ON_CARD: 1138 break; 1139 } 1140 } 1141 /* re-insert all entries from the failed_list into ipm_list */ 1142 list_for_each_entry_safe(ipm, tmp, &failed_list, list) 1143 list_move_tail(&ipm->list, &card->ipm_list); 1144 1145 spin_unlock_irqrestore(&card->ipm_lock, flags); 1146 } 1147 1148 /** 1149 * get mac address for the relevant Multicast address 1150 */ 1151 static void 1152 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev) 1153 { 1154 LCS_DBF_TEXT(4,trace, "getmac"); 1155 if (dev->type == ARPHRD_IEEE802_TR) 1156 ip_tr_mc_map(ipm, mac); 1157 else 1158 ip_eth_mc_map(ipm, mac); 1159 } 1160 1161 /** 1162 * function called by net device to handle multicast address relevant things 1163 */ 1164 static inline void 1165 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev) 1166 { 1167 struct ip_mc_list *im4; 1168 struct list_head *l; 1169 struct lcs_ipm_list *ipm; 1170 unsigned long flags; 1171 char buf[MAX_ADDR_LEN]; 1172 1173 LCS_DBF_TEXT(4, trace, "remmclst"); 1174 spin_lock_irqsave(&card->ipm_lock, flags); 1175 list_for_each(l, &card->ipm_list) { 1176 ipm = list_entry(l, struct lcs_ipm_list, list); 1177 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) { 1178 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev); 1179 if ( (ipm->ipm.ip_addr == im4->multiaddr) && 1180 (memcmp(buf, &ipm->ipm.mac_addr, 1181 LCS_MAC_LENGTH) == 0) ) 1182 break; 1183 } 1184 if (im4 == NULL) 1185 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED; 1186 } 1187 spin_unlock_irqrestore(&card->ipm_lock, flags); 1188 } 1189 1190 static inline struct lcs_ipm_list * 1191 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf) 1192 { 1193 struct lcs_ipm_list *tmp, *ipm = NULL; 1194 struct list_head *l; 1195 unsigned long flags; 1196 1197 LCS_DBF_TEXT(4, trace, "chkmcent"); 1198 spin_lock_irqsave(&card->ipm_lock, flags); 1199 list_for_each(l, &card->ipm_list) { 1200 tmp = list_entry(l, struct lcs_ipm_list, list); 1201 if ( (tmp->ipm.ip_addr == im4->multiaddr) && 1202 (memcmp(buf, &tmp->ipm.mac_addr, 1203 LCS_MAC_LENGTH) == 0) ) { 1204 ipm = tmp; 1205 break; 1206 } 1207 } 1208 spin_unlock_irqrestore(&card->ipm_lock, flags); 1209 return ipm; 1210 } 1211 1212 static inline void 1213 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev) 1214 { 1215 1216 struct ip_mc_list *im4; 1217 struct lcs_ipm_list *ipm; 1218 char buf[MAX_ADDR_LEN]; 1219 unsigned long flags; 1220 1221 LCS_DBF_TEXT(4, trace, "setmclst"); 1222 for (im4 = in4_dev->mc_list; im4; im4 = im4->next) { 1223 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev); 1224 ipm = lcs_check_addr_entry(card, im4, buf); 1225 if (ipm != NULL) 1226 continue; /* Address already in list. */ 1227 ipm = (struct lcs_ipm_list *) 1228 kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC); 1229 if (ipm == NULL) { 1230 PRINT_INFO("Not enough memory to add " 1231 "new multicast entry!\n"); 1232 break; 1233 } 1234 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH); 1235 ipm->ipm.ip_addr = im4->multiaddr; 1236 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED; 1237 spin_lock_irqsave(&card->ipm_lock, flags); 1238 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4); 1239 list_add(&ipm->list, &card->ipm_list); 1240 spin_unlock_irqrestore(&card->ipm_lock, flags); 1241 } 1242 } 1243 1244 static int 1245 lcs_register_mc_addresses(void *data) 1246 { 1247 struct lcs_card *card; 1248 struct in_device *in4_dev; 1249 1250 card = (struct lcs_card *) data; 1251 daemonize("regipm"); 1252 1253 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD)) 1254 return 0; 1255 LCS_DBF_TEXT(4, trace, "regmulti"); 1256 1257 in4_dev = in_dev_get(card->dev); 1258 if (in4_dev == NULL) 1259 goto out; 1260 read_lock(&in4_dev->mc_list_lock); 1261 lcs_remove_mc_addresses(card,in4_dev); 1262 lcs_set_mc_addresses(card, in4_dev); 1263 read_unlock(&in4_dev->mc_list_lock); 1264 in_dev_put(in4_dev); 1265 1266 netif_carrier_off(card->dev); 1267 netif_tx_disable(card->dev); 1268 wait_event(card->write.wait_q, 1269 (card->write.state != LCS_CH_STATE_RUNNING)); 1270 lcs_fix_multicast_list(card); 1271 if (card->state == DEV_STATE_UP) { 1272 netif_carrier_on(card->dev); 1273 netif_wake_queue(card->dev); 1274 } 1275 out: 1276 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD); 1277 return 0; 1278 } 1279 /** 1280 * function called by net device to 1281 * handle multicast address relevant things 1282 */ 1283 static void 1284 lcs_set_multicast_list(struct net_device *dev) 1285 { 1286 struct lcs_card *card; 1287 1288 LCS_DBF_TEXT(4, trace, "setmulti"); 1289 card = (struct lcs_card *) dev->priv; 1290 1291 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD)) 1292 schedule_work(&card->kernel_thread_starter); 1293 } 1294 1295 #endif /* CONFIG_IP_MULTICAST */ 1296 1297 static long 1298 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb) 1299 { 1300 if (!IS_ERR(irb)) 1301 return 0; 1302 1303 switch (PTR_ERR(irb)) { 1304 case -EIO: 1305 PRINT_WARN("i/o-error on device %s\n", cdev->dev.bus_id); 1306 LCS_DBF_TEXT(2, trace, "ckirberr"); 1307 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO); 1308 break; 1309 case -ETIMEDOUT: 1310 PRINT_WARN("timeout on device %s\n", cdev->dev.bus_id); 1311 LCS_DBF_TEXT(2, trace, "ckirberr"); 1312 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT); 1313 break; 1314 default: 1315 PRINT_WARN("unknown error %ld on device %s\n", PTR_ERR(irb), 1316 cdev->dev.bus_id); 1317 LCS_DBF_TEXT(2, trace, "ckirberr"); 1318 LCS_DBF_TEXT(2, trace, " rc???"); 1319 } 1320 return PTR_ERR(irb); 1321 } 1322 1323 static int 1324 lcs_get_problem(struct ccw_device *cdev, struct irb *irb) 1325 { 1326 int dstat, cstat; 1327 char *sense; 1328 1329 sense = (char *) irb->ecw; 1330 cstat = irb->scsw.cstat; 1331 dstat = irb->scsw.dstat; 1332 1333 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK | 1334 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK | 1335 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) { 1336 LCS_DBF_TEXT(2, trace, "CGENCHK"); 1337 return 1; 1338 } 1339 if (dstat & DEV_STAT_UNIT_CHECK) { 1340 if (sense[LCS_SENSE_BYTE_1] & 1341 LCS_SENSE_RESETTING_EVENT) { 1342 LCS_DBF_TEXT(2, trace, "REVIND"); 1343 return 1; 1344 } 1345 if (sense[LCS_SENSE_BYTE_0] & 1346 LCS_SENSE_CMD_REJECT) { 1347 LCS_DBF_TEXT(2, trace, "CMDREJ"); 1348 return 0; 1349 } 1350 if ((!sense[LCS_SENSE_BYTE_0]) && 1351 (!sense[LCS_SENSE_BYTE_1]) && 1352 (!sense[LCS_SENSE_BYTE_2]) && 1353 (!sense[LCS_SENSE_BYTE_3])) { 1354 LCS_DBF_TEXT(2, trace, "ZEROSEN"); 1355 return 0; 1356 } 1357 LCS_DBF_TEXT(2, trace, "DGENCHK"); 1358 return 1; 1359 } 1360 return 0; 1361 } 1362 1363 static void 1364 lcs_schedule_recovery(struct lcs_card *card) 1365 { 1366 LCS_DBF_TEXT(2, trace, "startrec"); 1367 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD)) 1368 schedule_work(&card->kernel_thread_starter); 1369 } 1370 1371 /** 1372 * IRQ Handler for LCS channels 1373 */ 1374 static void 1375 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) 1376 { 1377 struct lcs_card *card; 1378 struct lcs_channel *channel; 1379 int rc, index; 1380 int cstat, dstat; 1381 1382 if (lcs_check_irb_error(cdev, irb)) 1383 return; 1384 1385 card = CARD_FROM_DEV(cdev); 1386 if (card->read.ccwdev == cdev) 1387 channel = &card->read; 1388 else 1389 channel = &card->write; 1390 1391 cstat = irb->scsw.cstat; 1392 dstat = irb->scsw.dstat; 1393 LCS_DBF_TEXT_(5, trace, "Rint%s",cdev->dev.bus_id); 1394 LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.cstat, irb->scsw.dstat); 1395 LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.fctl, irb->scsw.actl); 1396 1397 /* Check for channel and device errors presented */ 1398 rc = lcs_get_problem(cdev, irb); 1399 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) { 1400 PRINT_WARN("check on device %s, dstat=0x%X, cstat=0x%X \n", 1401 cdev->dev.bus_id, dstat, cstat); 1402 if (rc) { 1403 channel->state = LCS_CH_STATE_ERROR; 1404 } 1405 } 1406 if (channel->state == LCS_CH_STATE_ERROR) { 1407 lcs_schedule_recovery(card); 1408 wake_up(&card->wait_q); 1409 return; 1410 } 1411 /* How far in the ccw chain have we processed? */ 1412 if ((channel->state != LCS_CH_STATE_INIT) && 1413 (irb->scsw.fctl & SCSW_FCTL_START_FUNC)) { 1414 index = (struct ccw1 *) __va((addr_t) irb->scsw.cpa) 1415 - channel->ccws; 1416 if ((irb->scsw.actl & SCSW_ACTL_SUSPENDED) || 1417 (irb->scsw.cstat & SCHN_STAT_PCI)) 1418 /* Bloody io subsystem tells us lies about cpa... */ 1419 index = (index - 1) & (LCS_NUM_BUFFS - 1); 1420 while (channel->io_idx != index) { 1421 __lcs_processed_buffer(channel, 1422 channel->iob + channel->io_idx); 1423 channel->io_idx = 1424 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1); 1425 } 1426 } 1427 1428 if ((irb->scsw.dstat & DEV_STAT_DEV_END) || 1429 (irb->scsw.dstat & DEV_STAT_CHN_END) || 1430 (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)) 1431 /* Mark channel as stopped. */ 1432 channel->state = LCS_CH_STATE_STOPPED; 1433 else if (irb->scsw.actl & SCSW_ACTL_SUSPENDED) 1434 /* CCW execution stopped on a suspend bit. */ 1435 channel->state = LCS_CH_STATE_SUSPENDED; 1436 if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) { 1437 if (irb->scsw.cc != 0) { 1438 ccw_device_halt(channel->ccwdev, (addr_t) channel); 1439 return; 1440 } 1441 /* The channel has been stopped by halt_IO. */ 1442 channel->state = LCS_CH_STATE_HALTED; 1443 } 1444 if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) { 1445 channel->state = LCS_CH_STATE_CLEARED; 1446 } 1447 /* Do the rest in the tasklet. */ 1448 tasklet_schedule(&channel->irq_tasklet); 1449 } 1450 1451 /** 1452 * Tasklet for IRQ handler 1453 */ 1454 static void 1455 lcs_tasklet(unsigned long data) 1456 { 1457 unsigned long flags; 1458 struct lcs_channel *channel; 1459 struct lcs_buffer *iob; 1460 int buf_idx; 1461 int rc; 1462 1463 channel = (struct lcs_channel *) data; 1464 LCS_DBF_TEXT_(5, trace, "tlet%s",channel->ccwdev->dev.bus_id); 1465 1466 /* Check for processed buffers. */ 1467 iob = channel->iob; 1468 buf_idx = channel->buf_idx; 1469 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) { 1470 /* Do the callback thing. */ 1471 if (iob[buf_idx].callback != NULL) 1472 iob[buf_idx].callback(channel, iob + buf_idx); 1473 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1); 1474 } 1475 channel->buf_idx = buf_idx; 1476 1477 if (channel->state == LCS_CH_STATE_STOPPED) 1478 // FIXME: what if rc != 0 ?? 1479 rc = lcs_start_channel(channel); 1480 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); 1481 if (channel->state == LCS_CH_STATE_SUSPENDED && 1482 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) { 1483 // FIXME: what if rc != 0 ?? 1484 rc = __lcs_resume_channel(channel); 1485 } 1486 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); 1487 1488 /* Something happened on the channel. Wake up waiters. */ 1489 wake_up(&channel->wait_q); 1490 } 1491 1492 /** 1493 * Finish current tx buffer and make it ready for transmit. 1494 */ 1495 static void 1496 __lcs_emit_txbuffer(struct lcs_card *card) 1497 { 1498 LCS_DBF_TEXT(5, trace, "emittx"); 1499 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0; 1500 card->tx_buffer->count += 2; 1501 lcs_ready_buffer(&card->write, card->tx_buffer); 1502 card->tx_buffer = NULL; 1503 card->tx_emitted++; 1504 } 1505 1506 /** 1507 * Callback for finished tx buffers. 1508 */ 1509 static void 1510 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer) 1511 { 1512 struct lcs_card *card; 1513 1514 LCS_DBF_TEXT(5, trace, "txbuffcb"); 1515 /* Put buffer back to pool. */ 1516 lcs_release_buffer(channel, buffer); 1517 card = container_of(channel, struct lcs_card, write); 1518 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev)) 1519 netif_wake_queue(card->dev); 1520 spin_lock(&card->lock); 1521 card->tx_emitted--; 1522 if (card->tx_emitted <= 0 && card->tx_buffer != NULL) 1523 /* 1524 * Last running tx buffer has finished. Submit partially 1525 * filled current buffer. 1526 */ 1527 __lcs_emit_txbuffer(card); 1528 spin_unlock(&card->lock); 1529 } 1530 1531 /** 1532 * Packet transmit function called by network stack 1533 */ 1534 static int 1535 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb, 1536 struct net_device *dev) 1537 { 1538 struct lcs_header *header; 1539 int rc = 0; 1540 1541 LCS_DBF_TEXT(5, trace, "hardxmit"); 1542 if (skb == NULL) { 1543 card->stats.tx_dropped++; 1544 card->stats.tx_errors++; 1545 return -EIO; 1546 } 1547 if (card->state != DEV_STATE_UP) { 1548 dev_kfree_skb(skb); 1549 card->stats.tx_dropped++; 1550 card->stats.tx_errors++; 1551 card->stats.tx_carrier_errors++; 1552 return 0; 1553 } 1554 if (skb->protocol == htons(ETH_P_IPV6)) { 1555 dev_kfree_skb(skb); 1556 return 0; 1557 } 1558 netif_stop_queue(card->dev); 1559 spin_lock(&card->lock); 1560 if (card->tx_buffer != NULL && 1561 card->tx_buffer->count + sizeof(struct lcs_header) + 1562 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE) 1563 /* skb too big for current tx buffer. */ 1564 __lcs_emit_txbuffer(card); 1565 if (card->tx_buffer == NULL) { 1566 /* Get new tx buffer */ 1567 card->tx_buffer = lcs_get_buffer(&card->write); 1568 if (card->tx_buffer == NULL) { 1569 card->stats.tx_dropped++; 1570 rc = -EBUSY; 1571 goto out; 1572 } 1573 card->tx_buffer->callback = lcs_txbuffer_cb; 1574 card->tx_buffer->count = 0; 1575 } 1576 header = (struct lcs_header *) 1577 (card->tx_buffer->data + card->tx_buffer->count); 1578 card->tx_buffer->count += skb->len + sizeof(struct lcs_header); 1579 header->offset = card->tx_buffer->count; 1580 header->type = card->lan_type; 1581 header->slot = card->portno; 1582 skb_copy_from_linear_data(skb, header + 1, skb->len); 1583 spin_unlock(&card->lock); 1584 card->stats.tx_bytes += skb->len; 1585 card->stats.tx_packets++; 1586 dev_kfree_skb(skb); 1587 netif_wake_queue(card->dev); 1588 spin_lock(&card->lock); 1589 if (card->tx_emitted <= 0 && card->tx_buffer != NULL) 1590 /* If this is the first tx buffer emit it immediately. */ 1591 __lcs_emit_txbuffer(card); 1592 out: 1593 spin_unlock(&card->lock); 1594 return rc; 1595 } 1596 1597 static int 1598 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev) 1599 { 1600 struct lcs_card *card; 1601 int rc; 1602 1603 LCS_DBF_TEXT(5, trace, "pktxmit"); 1604 card = (struct lcs_card *) dev->priv; 1605 rc = __lcs_start_xmit(card, skb, dev); 1606 return rc; 1607 } 1608 1609 /** 1610 * send startlan and lanstat command to make LCS device ready 1611 */ 1612 static int 1613 lcs_startlan_auto(struct lcs_card *card) 1614 { 1615 int rc; 1616 1617 LCS_DBF_TEXT(2, trace, "strtauto"); 1618 #ifdef CONFIG_NET_ETHERNET 1619 card->lan_type = LCS_FRAME_TYPE_ENET; 1620 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); 1621 if (rc == 0) 1622 return 0; 1623 1624 #endif 1625 #ifdef CONFIG_TR 1626 card->lan_type = LCS_FRAME_TYPE_TR; 1627 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); 1628 if (rc == 0) 1629 return 0; 1630 #endif 1631 #ifdef CONFIG_FDDI 1632 card->lan_type = LCS_FRAME_TYPE_FDDI; 1633 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); 1634 if (rc == 0) 1635 return 0; 1636 #endif 1637 return -EIO; 1638 } 1639 1640 static int 1641 lcs_startlan(struct lcs_card *card) 1642 { 1643 int rc, i; 1644 1645 LCS_DBF_TEXT(2, trace, "startlan"); 1646 rc = 0; 1647 if (card->portno != LCS_INVALID_PORT_NO) { 1648 if (card->lan_type == LCS_FRAME_TYPE_AUTO) 1649 rc = lcs_startlan_auto(card); 1650 else 1651 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); 1652 } else { 1653 for (i = 0; i <= 16; i++) { 1654 card->portno = i; 1655 if (card->lan_type != LCS_FRAME_TYPE_AUTO) 1656 rc = lcs_send_startlan(card, 1657 LCS_INITIATOR_TCPIP); 1658 else 1659 /* autodetecting lan type */ 1660 rc = lcs_startlan_auto(card); 1661 if (rc == 0) 1662 break; 1663 } 1664 } 1665 if (rc == 0) 1666 return lcs_send_lanstat(card); 1667 return rc; 1668 } 1669 1670 /** 1671 * LCS detect function 1672 * setup channels and make them I/O ready 1673 */ 1674 static int 1675 lcs_detect(struct lcs_card *card) 1676 { 1677 int rc = 0; 1678 1679 LCS_DBF_TEXT(2, setup, "lcsdetct"); 1680 /* start/reset card */ 1681 if (card->dev) 1682 netif_stop_queue(card->dev); 1683 rc = lcs_stop_channels(card); 1684 if (rc == 0) { 1685 rc = lcs_start_channels(card); 1686 if (rc == 0) { 1687 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP); 1688 if (rc == 0) 1689 rc = lcs_startlan(card); 1690 } 1691 } 1692 if (rc == 0) { 1693 card->state = DEV_STATE_UP; 1694 } else { 1695 card->state = DEV_STATE_DOWN; 1696 card->write.state = LCS_CH_STATE_INIT; 1697 card->read.state = LCS_CH_STATE_INIT; 1698 } 1699 return rc; 1700 } 1701 1702 /** 1703 * LCS Stop card 1704 */ 1705 static int 1706 lcs_stopcard(struct lcs_card *card) 1707 { 1708 int rc; 1709 1710 LCS_DBF_TEXT(3, setup, "stopcard"); 1711 1712 if (card->read.state != LCS_CH_STATE_STOPPED && 1713 card->write.state != LCS_CH_STATE_STOPPED && 1714 card->read.state != LCS_CH_STATE_ERROR && 1715 card->write.state != LCS_CH_STATE_ERROR && 1716 card->state == DEV_STATE_UP) { 1717 lcs_clear_multicast_list(card); 1718 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP); 1719 rc = lcs_send_shutdown(card); 1720 } 1721 rc = lcs_stop_channels(card); 1722 card->state = DEV_STATE_DOWN; 1723 1724 return rc; 1725 } 1726 1727 /** 1728 * Kernel Thread helper functions for LGW initiated commands 1729 */ 1730 static void 1731 lcs_start_kernel_thread(struct work_struct *work) 1732 { 1733 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter); 1734 LCS_DBF_TEXT(5, trace, "krnthrd"); 1735 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD)) 1736 kernel_thread(lcs_recovery, (void *) card, SIGCHLD); 1737 #ifdef CONFIG_IP_MULTICAST 1738 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD)) 1739 kernel_thread(lcs_register_mc_addresses, 1740 (void *) card, SIGCHLD); 1741 #endif 1742 } 1743 1744 /** 1745 * Process control frames. 1746 */ 1747 static void 1748 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd) 1749 { 1750 LCS_DBF_TEXT(5, trace, "getctrl"); 1751 if (cmd->initiator == LCS_INITIATOR_LGW) { 1752 switch(cmd->cmd_code) { 1753 case LCS_CMD_STARTUP: 1754 case LCS_CMD_STARTLAN: 1755 lcs_schedule_recovery(card); 1756 break; 1757 case LCS_CMD_STOPLAN: 1758 PRINT_WARN("Stoplan for %s initiated by LGW.\n", 1759 card->dev->name); 1760 if (card->dev) 1761 netif_carrier_off(card->dev); 1762 break; 1763 default: 1764 PRINT_INFO("UNRECOGNIZED LGW COMMAND\n"); 1765 break; 1766 } 1767 } else 1768 lcs_notify_lancmd_waiters(card, cmd); 1769 } 1770 1771 /** 1772 * Unpack network packet. 1773 */ 1774 static void 1775 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len) 1776 { 1777 struct sk_buff *skb; 1778 1779 LCS_DBF_TEXT(5, trace, "getskb"); 1780 if (card->dev == NULL || 1781 card->state != DEV_STATE_UP) 1782 /* The card isn't up. Ignore the packet. */ 1783 return; 1784 1785 skb = dev_alloc_skb(skb_len); 1786 if (skb == NULL) { 1787 PRINT_ERR("LCS: alloc_skb failed for device=%s\n", 1788 card->dev->name); 1789 card->stats.rx_dropped++; 1790 return; 1791 } 1792 memcpy(skb_put(skb, skb_len), skb_data, skb_len); 1793 skb->protocol = card->lan_type_trans(skb, card->dev); 1794 card->stats.rx_bytes += skb_len; 1795 card->stats.rx_packets++; 1796 if (skb->protocol == htons(ETH_P_802_2)) 1797 *((__u32 *)skb->cb) = ++card->pkt_seq; 1798 netif_rx(skb); 1799 } 1800 1801 /** 1802 * LCS main routine to get packets and lancmd replies from the buffers 1803 */ 1804 static void 1805 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer) 1806 { 1807 struct lcs_card *card; 1808 struct lcs_header *lcs_hdr; 1809 __u16 offset; 1810 1811 LCS_DBF_TEXT(5, trace, "lcsgtpkt"); 1812 lcs_hdr = (struct lcs_header *) buffer->data; 1813 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) { 1814 LCS_DBF_TEXT(4, trace, "-eiogpkt"); 1815 return; 1816 } 1817 card = container_of(channel, struct lcs_card, read); 1818 offset = 0; 1819 while (lcs_hdr->offset != 0) { 1820 if (lcs_hdr->offset <= 0 || 1821 lcs_hdr->offset > LCS_IOBUFFERSIZE || 1822 lcs_hdr->offset < offset) { 1823 /* Offset invalid. */ 1824 card->stats.rx_length_errors++; 1825 card->stats.rx_errors++; 1826 return; 1827 } 1828 /* What kind of frame is it? */ 1829 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL) 1830 /* Control frame. */ 1831 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr); 1832 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET || 1833 lcs_hdr->type == LCS_FRAME_TYPE_TR || 1834 lcs_hdr->type == LCS_FRAME_TYPE_FDDI) 1835 /* Normal network packet. */ 1836 lcs_get_skb(card, (char *)(lcs_hdr + 1), 1837 lcs_hdr->offset - offset - 1838 sizeof(struct lcs_header)); 1839 else 1840 /* Unknown frame type. */ 1841 ; // FIXME: error message ? 1842 /* Proceed to next frame. */ 1843 offset = lcs_hdr->offset; 1844 lcs_hdr->offset = LCS_ILLEGAL_OFFSET; 1845 lcs_hdr = (struct lcs_header *) (buffer->data + offset); 1846 } 1847 /* The buffer is now empty. Make it ready again. */ 1848 lcs_ready_buffer(&card->read, buffer); 1849 } 1850 1851 /** 1852 * get network statistics for ifconfig and other user programs 1853 */ 1854 static struct net_device_stats * 1855 lcs_getstats(struct net_device *dev) 1856 { 1857 struct lcs_card *card; 1858 1859 LCS_DBF_TEXT(4, trace, "netstats"); 1860 card = (struct lcs_card *) dev->priv; 1861 return &card->stats; 1862 } 1863 1864 /** 1865 * stop lcs device 1866 * This function will be called by user doing ifconfig xxx down 1867 */ 1868 static int 1869 lcs_stop_device(struct net_device *dev) 1870 { 1871 struct lcs_card *card; 1872 int rc; 1873 1874 LCS_DBF_TEXT(2, trace, "stopdev"); 1875 card = (struct lcs_card *) dev->priv; 1876 netif_carrier_off(dev); 1877 netif_tx_disable(dev); 1878 dev->flags &= ~IFF_UP; 1879 wait_event(card->write.wait_q, 1880 (card->write.state != LCS_CH_STATE_RUNNING)); 1881 rc = lcs_stopcard(card); 1882 if (rc) 1883 PRINT_ERR("Try it again!\n "); 1884 return rc; 1885 } 1886 1887 /** 1888 * start lcs device and make it runnable 1889 * This function will be called by user doing ifconfig xxx up 1890 */ 1891 static int 1892 lcs_open_device(struct net_device *dev) 1893 { 1894 struct lcs_card *card; 1895 int rc; 1896 1897 LCS_DBF_TEXT(2, trace, "opendev"); 1898 card = (struct lcs_card *) dev->priv; 1899 /* initialize statistics */ 1900 rc = lcs_detect(card); 1901 if (rc) { 1902 PRINT_ERR("LCS:Error in opening device!\n"); 1903 1904 } else { 1905 dev->flags |= IFF_UP; 1906 netif_carrier_on(dev); 1907 netif_wake_queue(dev); 1908 card->state = DEV_STATE_UP; 1909 } 1910 return rc; 1911 } 1912 1913 /** 1914 * show function for portno called by cat or similar things 1915 */ 1916 static ssize_t 1917 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf) 1918 { 1919 struct lcs_card *card; 1920 1921 card = (struct lcs_card *)dev->driver_data; 1922 1923 if (!card) 1924 return 0; 1925 1926 return sprintf(buf, "%d\n", card->portno); 1927 } 1928 1929 /** 1930 * store the value which is piped to file portno 1931 */ 1932 static ssize_t 1933 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 1934 { 1935 struct lcs_card *card; 1936 int value; 1937 1938 card = (struct lcs_card *)dev->driver_data; 1939 1940 if (!card) 1941 return 0; 1942 1943 sscanf(buf, "%u", &value); 1944 /* TODO: sanity checks */ 1945 card->portno = value; 1946 1947 return count; 1948 1949 } 1950 1951 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store); 1952 1953 static ssize_t 1954 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf) 1955 { 1956 struct ccwgroup_device *cgdev; 1957 1958 cgdev = to_ccwgroupdev(dev); 1959 if (!cgdev) 1960 return -ENODEV; 1961 1962 return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]); 1963 } 1964 1965 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL); 1966 1967 static ssize_t 1968 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf) 1969 { 1970 struct lcs_card *card; 1971 1972 card = (struct lcs_card *)dev->driver_data; 1973 1974 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0; 1975 } 1976 1977 static ssize_t 1978 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) 1979 { 1980 struct lcs_card *card; 1981 int value; 1982 1983 card = (struct lcs_card *)dev->driver_data; 1984 1985 if (!card) 1986 return 0; 1987 1988 sscanf(buf, "%u", &value); 1989 /* TODO: sanity checks */ 1990 card->lancmd_timeout = value; 1991 1992 return count; 1993 1994 } 1995 1996 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store); 1997 1998 static ssize_t 1999 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr, 2000 const char *buf, size_t count) 2001 { 2002 struct lcs_card *card = dev->driver_data; 2003 char *tmp; 2004 int i; 2005 2006 if (!card) 2007 return -EINVAL; 2008 if (card->state != DEV_STATE_UP) 2009 return -EPERM; 2010 i = simple_strtoul(buf, &tmp, 16); 2011 if (i == 1) 2012 lcs_schedule_recovery(card); 2013 return count; 2014 } 2015 2016 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store); 2017 2018 static struct attribute * lcs_attrs[] = { 2019 &dev_attr_portno.attr, 2020 &dev_attr_type.attr, 2021 &dev_attr_lancmd_timeout.attr, 2022 &dev_attr_recover.attr, 2023 NULL, 2024 }; 2025 2026 static struct attribute_group lcs_attr_group = { 2027 .attrs = lcs_attrs, 2028 }; 2029 2030 /** 2031 * lcs_probe_device is called on establishing a new ccwgroup_device. 2032 */ 2033 static int 2034 lcs_probe_device(struct ccwgroup_device *ccwgdev) 2035 { 2036 struct lcs_card *card; 2037 int ret; 2038 2039 if (!get_device(&ccwgdev->dev)) 2040 return -ENODEV; 2041 2042 LCS_DBF_TEXT(2, setup, "add_dev"); 2043 card = lcs_alloc_card(); 2044 if (!card) { 2045 PRINT_ERR("Allocation of lcs card failed\n"); 2046 put_device(&ccwgdev->dev); 2047 return -ENOMEM; 2048 } 2049 ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group); 2050 if (ret) { 2051 PRINT_ERR("Creating attributes failed"); 2052 lcs_free_card(card); 2053 put_device(&ccwgdev->dev); 2054 return ret; 2055 } 2056 ccwgdev->dev.driver_data = 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 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 = (struct lcs_card *)ccwgdev->dev.driver_data; 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 2084 static int 2085 lcs_new_device(struct ccwgroup_device *ccwgdev) 2086 { 2087 struct lcs_card *card; 2088 struct net_device *dev=NULL; 2089 enum lcs_dev_states recover_state; 2090 int rc; 2091 2092 card = (struct lcs_card *)ccwgdev->dev.driver_data; 2093 if (!card) 2094 return -ENODEV; 2095 2096 LCS_DBF_TEXT(2, setup, "newdev"); 2097 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2098 card->read.ccwdev = ccwgdev->cdev[0]; 2099 card->write.ccwdev = ccwgdev->cdev[1]; 2100 2101 recover_state = card->state; 2102 ccw_device_set_online(card->read.ccwdev); 2103 ccw_device_set_online(card->write.ccwdev); 2104 2105 LCS_DBF_TEXT(3, setup, "lcsnewdv"); 2106 2107 lcs_setup_card(card); 2108 rc = lcs_detect(card); 2109 if (rc) { 2110 LCS_DBF_TEXT(2, setup, "dtctfail"); 2111 PRINT_WARN("Detection of LCS card failed with return code " 2112 "%d (0x%x)\n", rc, rc); 2113 lcs_stopcard(card); 2114 goto out; 2115 } 2116 if (card->dev) { 2117 LCS_DBF_TEXT(2, setup, "samedev"); 2118 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2119 goto netdev_out; 2120 } 2121 switch (card->lan_type) { 2122 #ifdef CONFIG_NET_ETHERNET 2123 case LCS_FRAME_TYPE_ENET: 2124 card->lan_type_trans = eth_type_trans; 2125 dev = alloc_etherdev(0); 2126 break; 2127 #endif 2128 #ifdef CONFIG_TR 2129 case LCS_FRAME_TYPE_TR: 2130 card->lan_type_trans = tr_type_trans; 2131 dev = alloc_trdev(0); 2132 break; 2133 #endif 2134 #ifdef CONFIG_FDDI 2135 case LCS_FRAME_TYPE_FDDI: 2136 card->lan_type_trans = fddi_type_trans; 2137 dev = alloc_fddidev(0); 2138 break; 2139 #endif 2140 default: 2141 LCS_DBF_TEXT(3, setup, "errinit"); 2142 PRINT_ERR("LCS: Initialization failed\n"); 2143 PRINT_ERR("LCS: No device found!\n"); 2144 goto out; 2145 } 2146 if (!dev) 2147 goto out; 2148 card->dev = dev; 2149 card->dev->priv = card; 2150 card->dev->open = lcs_open_device; 2151 card->dev->stop = lcs_stop_device; 2152 card->dev->hard_start_xmit = lcs_start_xmit; 2153 card->dev->get_stats = lcs_getstats; 2154 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH); 2155 #ifdef CONFIG_IP_MULTICAST 2156 if (!lcs_check_multicast_support(card)) 2157 card->dev->set_multicast_list = lcs_set_multicast_list; 2158 #endif 2159 netdev_out: 2160 lcs_set_allowed_threads(card,0xffffffff); 2161 if (recover_state == DEV_STATE_RECOVER) { 2162 lcs_set_multicast_list(card->dev); 2163 card->dev->flags |= IFF_UP; 2164 netif_carrier_on(card->dev); 2165 netif_wake_queue(card->dev); 2166 card->state = DEV_STATE_UP; 2167 } else { 2168 lcs_stopcard(card); 2169 } 2170 2171 if (lcs_register_netdev(ccwgdev) != 0) 2172 goto out; 2173 2174 /* Print out supported assists: IPv6 */ 2175 PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name, 2176 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ? 2177 "with" : "without"); 2178 /* Print out supported assist: Multicast */ 2179 PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name, 2180 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ? 2181 "with" : "without"); 2182 return 0; 2183 out: 2184 2185 ccw_device_set_offline(card->read.ccwdev); 2186 ccw_device_set_offline(card->write.ccwdev); 2187 return -ENODEV; 2188 } 2189 2190 /** 2191 * lcs_shutdown_device, called when setting the group device offline. 2192 */ 2193 static int 2194 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode) 2195 { 2196 struct lcs_card *card; 2197 enum lcs_dev_states recover_state; 2198 int ret; 2199 2200 LCS_DBF_TEXT(3, setup, "shtdndev"); 2201 card = (struct lcs_card *)ccwgdev->dev.driver_data; 2202 if (!card) 2203 return -ENODEV; 2204 if (recovery_mode == 0) { 2205 lcs_set_allowed_threads(card, 0); 2206 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD)) 2207 return -ERESTARTSYS; 2208 } 2209 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2210 recover_state = card->state; 2211 2212 ret = lcs_stop_device(card->dev); 2213 ret = ccw_device_set_offline(card->read.ccwdev); 2214 ret = ccw_device_set_offline(card->write.ccwdev); 2215 if (recover_state == DEV_STATE_UP) { 2216 card->state = DEV_STATE_RECOVER; 2217 } 2218 if (ret) 2219 return ret; 2220 return 0; 2221 } 2222 2223 static int 2224 lcs_shutdown_device(struct ccwgroup_device *ccwgdev) 2225 { 2226 return __lcs_shutdown_device(ccwgdev, 0); 2227 } 2228 2229 /** 2230 * drive lcs recovery after startup and startlan initiated by Lan Gateway 2231 */ 2232 static int 2233 lcs_recovery(void *ptr) 2234 { 2235 struct lcs_card *card; 2236 struct ccwgroup_device *gdev; 2237 int rc; 2238 2239 card = (struct lcs_card *) ptr; 2240 daemonize("lcs_recover"); 2241 2242 LCS_DBF_TEXT(4, trace, "recover1"); 2243 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD)) 2244 return 0; 2245 LCS_DBF_TEXT(4, trace, "recover2"); 2246 gdev = card->gdev; 2247 PRINT_WARN("Recovery of device %s started...\n", gdev->dev.bus_id); 2248 rc = __lcs_shutdown_device(gdev, 1); 2249 rc = lcs_new_device(gdev); 2250 if (!rc) 2251 PRINT_INFO("Device %s successfully recovered!\n", 2252 card->dev->name); 2253 else 2254 PRINT_INFO("Device %s could not be recovered!\n", 2255 card->dev->name); 2256 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD); 2257 return 0; 2258 } 2259 2260 /** 2261 * lcs_remove_device, free buffers and card 2262 */ 2263 static void 2264 lcs_remove_device(struct ccwgroup_device *ccwgdev) 2265 { 2266 struct lcs_card *card; 2267 2268 card = (struct lcs_card *)ccwgdev->dev.driver_data; 2269 if (!card) 2270 return; 2271 2272 PRINT_INFO("Removing lcs group device ....\n"); 2273 LCS_DBF_TEXT(3, setup, "remdev"); 2274 LCS_DBF_HEX(3, setup, &card, sizeof(void*)); 2275 if (ccwgdev->state == CCWGROUP_ONLINE) { 2276 lcs_shutdown_device(ccwgdev); 2277 } 2278 if (card->dev) 2279 unregister_netdev(card->dev); 2280 sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group); 2281 lcs_cleanup_card(card); 2282 lcs_free_card(card); 2283 put_device(&ccwgdev->dev); 2284 } 2285 2286 /** 2287 * LCS ccwgroup driver registration 2288 */ 2289 static struct ccwgroup_driver lcs_group_driver = { 2290 .owner = THIS_MODULE, 2291 .name = "lcs", 2292 .max_slaves = 2, 2293 .driver_id = 0xD3C3E2, 2294 .probe = lcs_probe_device, 2295 .remove = lcs_remove_device, 2296 .set_online = lcs_new_device, 2297 .set_offline = lcs_shutdown_device, 2298 }; 2299 2300 /** 2301 * LCS Module/Kernel initialization function 2302 */ 2303 static int 2304 __init lcs_init_module(void) 2305 { 2306 int rc; 2307 2308 PRINT_INFO("Loading %s\n",version); 2309 rc = lcs_register_debug_facility(); 2310 LCS_DBF_TEXT(0, setup, "lcsinit"); 2311 if (rc) { 2312 PRINT_ERR("Initialization failed\n"); 2313 return rc; 2314 } 2315 2316 rc = register_cu3088_discipline(&lcs_group_driver); 2317 if (rc) { 2318 PRINT_ERR("Initialization failed\n"); 2319 return rc; 2320 } 2321 return 0; 2322 } 2323 2324 2325 /** 2326 * LCS module cleanup function 2327 */ 2328 static void 2329 __exit lcs_cleanup_module(void) 2330 { 2331 PRINT_INFO("Terminating lcs module.\n"); 2332 LCS_DBF_TEXT(0, trace, "cleanup"); 2333 unregister_cu3088_discipline(&lcs_group_driver); 2334 lcs_unregister_debug_facility(); 2335 } 2336 2337 module_init(lcs_init_module); 2338 module_exit(lcs_cleanup_module); 2339 2340 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>"); 2341 MODULE_LICENSE("GPL"); 2342 2343