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