1 /****************************************************************************** 2 * usbatm.c - Generic USB xDSL driver core 3 * 4 * Copyright (C) 2001, Alcatel 5 * Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas 6 * Copyright (C) 2004, David Woodhouse, Roman Kagan 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the Free 10 * Software Foundation; either version 2 of the License, or (at your option) 11 * any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but WITHOUT 14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 16 * more details. 17 * 18 * You should have received a copy of the GNU General Public License along with 19 * this program; if not, write to the Free Software Foundation, Inc., 59 20 * Temple Place - Suite 330, Boston, MA 02111-1307, USA. 21 * 22 ******************************************************************************/ 23 24 /* 25 * Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse 26 * 27 * 1.7+: - See the check-in logs 28 * 29 * 1.6: - No longer opens a connection if the firmware is not loaded 30 * - Added support for the speedtouch 330 31 * - Removed the limit on the number of devices 32 * - Module now autoloads on device plugin 33 * - Merged relevant parts of sarlib 34 * - Replaced the kernel thread with a tasklet 35 * - New packet transmission code 36 * - Changed proc file contents 37 * - Fixed all known SMP races 38 * - Many fixes and cleanups 39 * - Various fixes by Oliver Neukum (oliver@neukum.name) 40 * 41 * 1.5A: - Version for inclusion in 2.5 series kernel 42 * - Modifications by Richard Purdie (rpurdie@rpsys.net) 43 * - made compatible with kernel 2.5.6 onwards by changing 44 * usbatm_usb_send_data_context->urb to a pointer and adding code 45 * to alloc and free it 46 * - remove_wait_queue() added to usbatm_atm_processqueue_thread() 47 * 48 * 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL. 49 * (reported by stephen.robinson@zen.co.uk) 50 * 51 * 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave() 52 * - unlink all active send urbs of a vcc that is being closed. 53 * 54 * 1.3.1: - added the version number 55 * 56 * 1.3: - Added multiple send urb support 57 * - fixed memory leak and vcc->tx_inuse starvation bug 58 * when not enough memory left in vcc. 59 * 60 * 1.2: - Fixed race condition in usbatm_usb_send_data() 61 * 1.1: - Turned off packet debugging 62 * 63 */ 64 65 #include "usbatm.h" 66 67 #include <asm/uaccess.h> 68 #include <linux/crc32.h> 69 #include <linux/errno.h> 70 #include <linux/init.h> 71 #include <linux/interrupt.h> 72 #include <linux/kernel.h> 73 #include <linux/module.h> 74 #include <linux/moduleparam.h> 75 #include <linux/proc_fs.h> 76 #include <linux/sched.h> 77 #include <linux/signal.h> 78 #include <linux/slab.h> 79 #include <linux/smp_lock.h> 80 #include <linux/stat.h> 81 #include <linux/timer.h> 82 #include <linux/wait.h> 83 84 #ifdef VERBOSE_DEBUG 85 static int usbatm_print_packet(const unsigned char *data, int len); 86 #define PACKETDEBUG(arg...) usbatm_print_packet (arg) 87 #define vdbg(arg...) dbg (arg) 88 #else 89 #define PACKETDEBUG(arg...) 90 #define vdbg(arg...) 91 #endif 92 93 #define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>" 94 #define DRIVER_VERSION "1.9" 95 #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION 96 97 static const char usbatm_driver_name[] = "usbatm"; 98 99 #define UDSL_MAX_RCV_URBS 16 100 #define UDSL_MAX_SND_URBS 16 101 #define UDSL_MAX_RCV_BUF_SIZE 1024 /* ATM cells */ 102 #define UDSL_MAX_SND_BUF_SIZE 1024 /* ATM cells */ 103 #define UDSL_DEFAULT_RCV_URBS 4 104 #define UDSL_DEFAULT_SND_URBS 4 105 #define UDSL_DEFAULT_RCV_BUF_SIZE 64 /* ATM cells */ 106 #define UDSL_DEFAULT_SND_BUF_SIZE 64 /* ATM cells */ 107 108 #define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD) 109 110 #define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */ 111 112 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS; 113 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS; 114 static unsigned int rcv_buf_size = UDSL_DEFAULT_RCV_BUF_SIZE; 115 static unsigned int snd_buf_size = UDSL_DEFAULT_SND_BUF_SIZE; 116 117 module_param(num_rcv_urbs, uint, S_IRUGO); 118 MODULE_PARM_DESC(num_rcv_urbs, 119 "Number of urbs used for reception (range: 0-" 120 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: " 121 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")"); 122 123 module_param(num_snd_urbs, uint, S_IRUGO); 124 MODULE_PARM_DESC(num_snd_urbs, 125 "Number of urbs used for transmission (range: 0-" 126 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: " 127 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")"); 128 129 module_param(rcv_buf_size, uint, S_IRUGO); 130 MODULE_PARM_DESC(rcv_buf_size, 131 "Size of the buffers used for reception in ATM cells (range: 1-" 132 __MODULE_STRING(UDSL_MAX_RCV_BUF_SIZE) ", default: " 133 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")"); 134 135 module_param(snd_buf_size, uint, S_IRUGO); 136 MODULE_PARM_DESC(snd_buf_size, 137 "Size of the buffers used for transmission in ATM cells (range: 1-" 138 __MODULE_STRING(UDSL_MAX_SND_BUF_SIZE) ", default: " 139 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")"); 140 141 142 /* receive */ 143 144 struct usbatm_vcc_data { 145 /* vpi/vci lookup */ 146 struct list_head list; 147 short vpi; 148 int vci; 149 struct atm_vcc *vcc; 150 151 /* raw cell reassembly */ 152 struct sk_buff *sarb; 153 }; 154 155 156 /* send */ 157 158 struct usbatm_control { 159 struct atm_skb_data atm; 160 u32 len; 161 u32 crc; 162 }; 163 164 #define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb) 165 166 167 /* ATM */ 168 169 static void usbatm_atm_dev_close(struct atm_dev *dev); 170 static int usbatm_atm_open(struct atm_vcc *vcc); 171 static void usbatm_atm_close(struct atm_vcc *vcc); 172 static int usbatm_atm_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg); 173 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb); 174 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page); 175 176 static struct atmdev_ops usbatm_atm_devops = { 177 .dev_close = usbatm_atm_dev_close, 178 .open = usbatm_atm_open, 179 .close = usbatm_atm_close, 180 .ioctl = usbatm_atm_ioctl, 181 .send = usbatm_atm_send, 182 .proc_read = usbatm_atm_proc_read, 183 .owner = THIS_MODULE, 184 }; 185 186 187 /*********** 188 ** misc ** 189 ***********/ 190 191 static inline unsigned int usbatm_pdu_length(unsigned int length) 192 { 193 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER; 194 return length - length % ATM_CELL_PAYLOAD; 195 } 196 197 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb) 198 { 199 if (vcc->pop) 200 vcc->pop(vcc, skb); 201 else 202 dev_kfree_skb(skb); 203 } 204 205 206 /*********** 207 ** urbs ** 208 ************/ 209 210 static inline struct urb *usbatm_pop_urb(struct usbatm_channel *channel) 211 { 212 struct urb *urb; 213 214 spin_lock_irq(&channel->lock); 215 if (list_empty(&channel->list)) { 216 spin_unlock_irq(&channel->lock); 217 return NULL; 218 } 219 220 urb = list_entry(channel->list.next, struct urb, urb_list); 221 list_del(&urb->urb_list); 222 spin_unlock_irq(&channel->lock); 223 224 return urb; 225 } 226 227 static inline int usbatm_submit_urb(struct urb *urb) 228 { 229 struct usbatm_channel *channel = urb->context; 230 int ret; 231 232 vdbg("%s: submitting urb 0x%p, size %u", 233 __func__, urb, urb->transfer_buffer_length); 234 235 ret = usb_submit_urb(urb, GFP_ATOMIC); 236 if (ret) { 237 atm_dbg(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n", 238 __func__, urb, ret); 239 240 /* consider all errors transient and return the buffer back to the queue */ 241 urb->status = -EAGAIN; 242 spin_lock_irq(&channel->lock); 243 244 /* must add to the front when sending; doesn't matter when receiving */ 245 list_add(&urb->urb_list, &channel->list); 246 247 spin_unlock_irq(&channel->lock); 248 249 /* make sure the channel doesn't stall */ 250 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); 251 } 252 253 return ret; 254 } 255 256 static void usbatm_complete(struct urb *urb, struct pt_regs *regs) 257 { 258 struct usbatm_channel *channel = urb->context; 259 unsigned long flags; 260 261 vdbg("%s: urb 0x%p, status %d, actual_length %d", 262 __func__, urb, urb->status, urb->actual_length); 263 264 /* usually in_interrupt(), but not always */ 265 spin_lock_irqsave(&channel->lock, flags); 266 267 /* must add to the back when receiving; doesn't matter when sending */ 268 list_add_tail(&urb->urb_list, &channel->list); 269 270 spin_unlock_irqrestore(&channel->lock, flags); 271 272 if (unlikely(urb->status)) 273 /* throttle processing in case of an error */ 274 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); 275 else 276 tasklet_schedule(&channel->tasklet); 277 } 278 279 280 /************* 281 ** decode ** 282 *************/ 283 284 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance, 285 short vpi, int vci) 286 { 287 struct usbatm_vcc_data *vcc; 288 289 list_for_each_entry(vcc, &instance->vcc_list, list) 290 if ((vcc->vci == vci) && (vcc->vpi == vpi)) 291 return vcc; 292 return NULL; 293 } 294 295 static void usbatm_extract_cells(struct usbatm_data *instance, 296 unsigned char *source, unsigned int avail_data) 297 { 298 struct usbatm_vcc_data *cached_vcc = NULL; 299 struct atm_vcc *vcc; 300 struct sk_buff *sarb; 301 unsigned int stride = instance->rx_channel.stride; 302 int vci, cached_vci = 0; 303 short vpi, cached_vpi = 0; 304 u8 pti; 305 306 for (; avail_data >= stride; avail_data -= stride, source += stride) { 307 vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4); 308 vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4); 309 pti = ((source[3] & 0xe) >> 1); 310 311 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti); 312 313 if ((vci != cached_vci) || (vpi != cached_vpi)) { 314 cached_vpi = vpi; 315 cached_vci = vci; 316 317 cached_vcc = usbatm_find_vcc(instance, vpi, vci); 318 319 if (!cached_vcc) 320 atm_dbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci); 321 } 322 323 if (!cached_vcc) 324 continue; 325 326 vcc = cached_vcc->vcc; 327 328 /* OAM F5 end-to-end */ 329 if (pti == ATM_PTI_E2EF5) { 330 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n", __func__, vpi, vci); 331 atomic_inc(&vcc->stats->rx_err); 332 continue; 333 } 334 335 sarb = cached_vcc->sarb; 336 337 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) { 338 atm_dbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n", 339 __func__, sarb->len, vcc); 340 /* discard cells already received */ 341 skb_trim(sarb, 0); 342 UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end); 343 } 344 345 memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD); 346 __skb_put(sarb, ATM_CELL_PAYLOAD); 347 348 if (pti & 1) { 349 struct sk_buff *skb; 350 unsigned int length; 351 unsigned int pdu_length; 352 353 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5]; 354 355 /* guard against overflow */ 356 if (length > ATM_MAX_AAL5_PDU) { 357 atm_dbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n", 358 __func__, length, vcc); 359 atomic_inc(&vcc->stats->rx_err); 360 goto out; 361 } 362 363 pdu_length = usbatm_pdu_length(length); 364 365 if (sarb->len < pdu_length) { 366 atm_dbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n", 367 __func__, pdu_length, sarb->len, vcc); 368 atomic_inc(&vcc->stats->rx_err); 369 goto out; 370 } 371 372 if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) { 373 atm_dbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n", 374 __func__, vcc); 375 atomic_inc(&vcc->stats->rx_err); 376 goto out; 377 } 378 379 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc); 380 381 if (!(skb = dev_alloc_skb(length))) { 382 atm_dbg(instance, "%s: no memory for skb (length: %u)!\n", __func__, length); 383 atomic_inc(&vcc->stats->rx_drop); 384 goto out; 385 } 386 387 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize); 388 389 if (!atm_charge(vcc, skb->truesize)) { 390 atm_dbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n", __func__, skb->truesize); 391 dev_kfree_skb(skb); 392 goto out; /* atm_charge increments rx_drop */ 393 } 394 395 memcpy(skb->data, sarb->tail - pdu_length, length); 396 __skb_put(skb, length); 397 398 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u", 399 __func__, skb, skb->len, skb->truesize); 400 401 PACKETDEBUG(skb->data, skb->len); 402 403 vcc->push(vcc, skb); 404 405 atomic_inc(&vcc->stats->rx); 406 out: 407 skb_trim(sarb, 0); 408 } 409 } 410 } 411 412 413 /************* 414 ** encode ** 415 *************/ 416 417 static unsigned int usbatm_write_cells(struct usbatm_data *instance, 418 struct sk_buff *skb, 419 u8 *target, unsigned int avail_space) 420 { 421 struct usbatm_control *ctrl = UDSL_SKB(skb); 422 struct atm_vcc *vcc = ctrl->atm.vcc; 423 unsigned int num_written; 424 unsigned int stride = instance->tx_channel.stride; 425 426 vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space); 427 UDSL_ASSERT(!(avail_space % stride)); 428 429 for (num_written = 0; num_written < avail_space && ctrl->len; 430 num_written += stride, target += stride) { 431 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD); 432 unsigned int left = ATM_CELL_PAYLOAD - data_len; 433 u8 *ptr = target; 434 435 ptr[0] = vcc->vpi >> 4; 436 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12); 437 ptr[2] = vcc->vci >> 4; 438 ptr[3] = vcc->vci << 4; 439 ptr[4] = 0xec; 440 ptr += ATM_CELL_HEADER; 441 442 memcpy(ptr, skb->data, data_len); 443 ptr += data_len; 444 __skb_pull(skb, data_len); 445 446 if(!left) 447 continue; 448 449 memset(ptr, 0, left); 450 451 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */ 452 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER; 453 /* trailer[0] = 0; UU = 0 */ 454 /* trailer[1] = 0; CPI = 0 */ 455 trailer[2] = ctrl->len >> 8; 456 trailer[3] = ctrl->len; 457 458 ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4); 459 460 trailer[4] = ctrl->crc >> 24; 461 trailer[5] = ctrl->crc >> 16; 462 trailer[6] = ctrl->crc >> 8; 463 trailer[7] = ctrl->crc; 464 465 target[3] |= 0x2; /* adjust PTI */ 466 467 ctrl->len = 0; /* tag this skb finished */ 468 } 469 else 470 ctrl->crc = crc32_be(ctrl->crc, ptr, left); 471 } 472 473 return num_written; 474 } 475 476 477 /************** 478 ** receive ** 479 **************/ 480 481 static void usbatm_rx_process(unsigned long data) 482 { 483 struct usbatm_data *instance = (struct usbatm_data *)data; 484 struct urb *urb; 485 486 while ((urb = usbatm_pop_urb(&instance->rx_channel))) { 487 vdbg("%s: processing urb 0x%p", __func__, urb); 488 489 if (usb_pipeisoc(urb->pipe)) { 490 int i; 491 for (i = 0; i < urb->number_of_packets; i++) 492 if (!urb->iso_frame_desc[i].status) 493 usbatm_extract_cells(instance, 494 (u8 *)urb->transfer_buffer + urb->iso_frame_desc[i].offset, 495 urb->iso_frame_desc[i].actual_length); 496 } 497 else 498 if (!urb->status) 499 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length); 500 501 if (usbatm_submit_urb(urb)) 502 return; 503 } 504 } 505 506 507 /*********** 508 ** send ** 509 ***********/ 510 511 static void usbatm_tx_process(unsigned long data) 512 { 513 struct usbatm_data *instance = (struct usbatm_data *)data; 514 struct sk_buff *skb = instance->current_skb; 515 struct urb *urb = NULL; 516 const unsigned int buf_size = instance->tx_channel.buf_size; 517 unsigned int num_written = 0; 518 u8 *buffer = NULL; 519 520 if (!skb) 521 skb = skb_dequeue(&instance->sndqueue); 522 523 while (skb) { 524 if (!urb) { 525 urb = usbatm_pop_urb(&instance->tx_channel); 526 if (!urb) 527 break; /* no more senders */ 528 buffer = urb->transfer_buffer; 529 num_written = (urb->status == -EAGAIN) ? 530 urb->transfer_buffer_length : 0; 531 } 532 533 num_written += usbatm_write_cells(instance, skb, 534 buffer + num_written, 535 buf_size - num_written); 536 537 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p", 538 __func__, num_written, skb, urb); 539 540 if (!UDSL_SKB(skb)->len) { 541 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc; 542 543 usbatm_pop(vcc, skb); 544 atomic_inc(&vcc->stats->tx); 545 546 skb = skb_dequeue(&instance->sndqueue); 547 } 548 549 if (num_written == buf_size || (!skb && num_written)) { 550 urb->transfer_buffer_length = num_written; 551 552 if (usbatm_submit_urb(urb)) 553 break; 554 urb = NULL; 555 } 556 } 557 558 instance->current_skb = skb; 559 } 560 561 static void usbatm_cancel_send(struct usbatm_data *instance, 562 struct atm_vcc *vcc) 563 { 564 struct sk_buff *skb, *n; 565 566 atm_dbg(instance, "%s entered\n", __func__); 567 spin_lock_irq(&instance->sndqueue.lock); 568 for (skb = instance->sndqueue.next, n = skb->next; 569 skb != (struct sk_buff *)&instance->sndqueue; 570 skb = n, n = skb->next) 571 if (UDSL_SKB(skb)->atm.vcc == vcc) { 572 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb); 573 __skb_unlink(skb, &instance->sndqueue); 574 usbatm_pop(vcc, skb); 575 } 576 spin_unlock_irq(&instance->sndqueue.lock); 577 578 tasklet_disable(&instance->tx_channel.tasklet); 579 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) { 580 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb); 581 instance->current_skb = NULL; 582 usbatm_pop(vcc, skb); 583 } 584 tasklet_enable(&instance->tx_channel.tasklet); 585 atm_dbg(instance, "%s done\n", __func__); 586 } 587 588 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) 589 { 590 struct usbatm_data *instance = vcc->dev->dev_data; 591 struct usbatm_control *ctrl = UDSL_SKB(skb); 592 int err; 593 594 vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len); 595 596 if (!instance) { 597 dbg("%s: NULL data!", __func__); 598 err = -ENODEV; 599 goto fail; 600 } 601 602 if (vcc->qos.aal != ATM_AAL5) { 603 atm_dbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); 604 err = -EINVAL; 605 goto fail; 606 } 607 608 if (skb->len > ATM_MAX_AAL5_PDU) { 609 atm_dbg(instance, "%s: packet too long (%d vs %d)!\n", 610 __func__, skb->len, ATM_MAX_AAL5_PDU); 611 err = -EINVAL; 612 goto fail; 613 } 614 615 PACKETDEBUG(skb->data, skb->len); 616 617 /* initialize the control block */ 618 ctrl->atm.vcc = vcc; 619 ctrl->len = skb->len; 620 ctrl->crc = crc32_be(~0, skb->data, skb->len); 621 622 skb_queue_tail(&instance->sndqueue, skb); 623 tasklet_schedule(&instance->tx_channel.tasklet); 624 625 return 0; 626 627 fail: 628 usbatm_pop(vcc, skb); 629 return err; 630 } 631 632 633 /******************** 634 ** bean counting ** 635 ********************/ 636 637 static void usbatm_destroy_instance(struct kref *kref) 638 { 639 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount); 640 641 dbg("%s", __func__); 642 643 tasklet_kill(&instance->rx_channel.tasklet); 644 tasklet_kill(&instance->tx_channel.tasklet); 645 usb_put_dev(instance->usb_dev); 646 kfree(instance); 647 } 648 649 static void usbatm_get_instance(struct usbatm_data *instance) 650 { 651 dbg("%s", __func__); 652 653 kref_get(&instance->refcount); 654 } 655 656 static void usbatm_put_instance(struct usbatm_data *instance) 657 { 658 dbg("%s", __func__); 659 660 kref_put(&instance->refcount, usbatm_destroy_instance); 661 } 662 663 664 /********** 665 ** ATM ** 666 **********/ 667 668 static void usbatm_atm_dev_close(struct atm_dev *dev) 669 { 670 struct usbatm_data *instance = dev->dev_data; 671 672 dbg("%s", __func__); 673 674 if (!instance) 675 return; 676 677 dev->dev_data = NULL; 678 usbatm_put_instance(instance); /* taken in usbatm_atm_init */ 679 } 680 681 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page) 682 { 683 struct usbatm_data *instance = atm_dev->dev_data; 684 int left = *pos; 685 686 if (!instance) { 687 dbg("%s: NULL instance!", __func__); 688 return -ENODEV; 689 } 690 691 if (!left--) 692 return sprintf(page, "%s\n", instance->description); 693 694 if (!left--) 695 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n", 696 atm_dev->esi[0], atm_dev->esi[1], 697 atm_dev->esi[2], atm_dev->esi[3], 698 atm_dev->esi[4], atm_dev->esi[5]); 699 700 if (!left--) 701 return sprintf(page, 702 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n", 703 atomic_read(&atm_dev->stats.aal5.tx), 704 atomic_read(&atm_dev->stats.aal5.tx_err), 705 atomic_read(&atm_dev->stats.aal5.rx), 706 atomic_read(&atm_dev->stats.aal5.rx_err), 707 atomic_read(&atm_dev->stats.aal5.rx_drop)); 708 709 if (!left--) 710 switch (atm_dev->signal) { 711 case ATM_PHY_SIG_FOUND: 712 return sprintf(page, "Line up\n"); 713 case ATM_PHY_SIG_LOST: 714 return sprintf(page, "Line down\n"); 715 default: 716 return sprintf(page, "Line state unknown\n"); 717 } 718 719 return 0; 720 } 721 722 static int usbatm_atm_open(struct atm_vcc *vcc) 723 { 724 struct usbatm_data *instance = vcc->dev->dev_data; 725 struct usbatm_vcc_data *new = NULL; 726 int ret; 727 int vci = vcc->vci; 728 short vpi = vcc->vpi; 729 730 if (!instance) { 731 dbg("%s: NULL data!", __func__); 732 return -ENODEV; 733 } 734 735 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci); 736 737 /* only support AAL5 */ 738 if ((vcc->qos.aal != ATM_AAL5) || (vcc->qos.rxtp.max_sdu < 0) 739 || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) { 740 atm_dbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); 741 return -EINVAL; 742 } 743 744 down(&instance->serialize); /* vs self, usbatm_atm_close */ 745 746 if (usbatm_find_vcc(instance, vpi, vci)) { 747 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci); 748 ret = -EADDRINUSE; 749 goto fail; 750 } 751 752 if (!(new = kmalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) { 753 atm_dbg(instance, "%s: no memory for vcc_data!\n", __func__); 754 ret = -ENOMEM; 755 goto fail; 756 } 757 758 memset(new, 0, sizeof(struct usbatm_vcc_data)); 759 new->vcc = vcc; 760 new->vpi = vpi; 761 new->vci = vci; 762 763 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL); 764 if (!new->sarb) { 765 atm_dbg(instance, "%s: no memory for SAR buffer!\n", __func__); 766 ret = -ENOMEM; 767 goto fail; 768 } 769 770 vcc->dev_data = new; 771 772 tasklet_disable(&instance->rx_channel.tasklet); 773 list_add(&new->list, &instance->vcc_list); 774 tasklet_enable(&instance->rx_channel.tasklet); 775 776 set_bit(ATM_VF_ADDR, &vcc->flags); 777 set_bit(ATM_VF_PARTIAL, &vcc->flags); 778 set_bit(ATM_VF_READY, &vcc->flags); 779 780 up(&instance->serialize); 781 782 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new); 783 784 return 0; 785 786 fail: 787 kfree(new); 788 up(&instance->serialize); 789 return ret; 790 } 791 792 static void usbatm_atm_close(struct atm_vcc *vcc) 793 { 794 struct usbatm_data *instance = vcc->dev->dev_data; 795 struct usbatm_vcc_data *vcc_data = vcc->dev_data; 796 797 if (!instance || !vcc_data) { 798 dbg("%s: NULL data!", __func__); 799 return; 800 } 801 802 atm_dbg(instance, "%s entered\n", __func__); 803 804 atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n", 805 __func__, vcc_data, vcc_data->vpi, vcc_data->vci); 806 807 usbatm_cancel_send(instance, vcc); 808 809 down(&instance->serialize); /* vs self, usbatm_atm_open */ 810 811 tasklet_disable(&instance->rx_channel.tasklet); 812 list_del(&vcc_data->list); 813 tasklet_enable(&instance->rx_channel.tasklet); 814 815 kfree_skb(vcc_data->sarb); 816 vcc_data->sarb = NULL; 817 818 kfree(vcc_data); 819 vcc->dev_data = NULL; 820 821 vcc->vpi = ATM_VPI_UNSPEC; 822 vcc->vci = ATM_VCI_UNSPEC; 823 clear_bit(ATM_VF_READY, &vcc->flags); 824 clear_bit(ATM_VF_PARTIAL, &vcc->flags); 825 clear_bit(ATM_VF_ADDR, &vcc->flags); 826 827 up(&instance->serialize); 828 829 atm_dbg(instance, "%s successful\n", __func__); 830 } 831 832 static int usbatm_atm_ioctl(struct atm_dev *dev, unsigned int cmd, 833 void __user * arg) 834 { 835 switch (cmd) { 836 case ATM_QUERYLOOP: 837 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0; 838 default: 839 return -ENOIOCTLCMD; 840 } 841 } 842 843 static int usbatm_atm_init(struct usbatm_data *instance) 844 { 845 struct atm_dev *atm_dev; 846 int ret, i; 847 848 /* ATM init */ 849 atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL); 850 if (!atm_dev) { 851 usb_dbg(instance, "%s: failed to register ATM device!\n", __func__); 852 return -1; 853 } 854 855 instance->atm_dev = atm_dev; 856 857 atm_dev->ci_range.vpi_bits = ATM_CI_MAX; 858 atm_dev->ci_range.vci_bits = ATM_CI_MAX; 859 atm_dev->signal = ATM_PHY_SIG_UNKNOWN; 860 861 /* temp init ATM device, set to 128kbit */ 862 atm_dev->link_rate = 128 * 1000 / 424; 863 864 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) { 865 atm_dbg(instance, "%s: atm_start failed: %d!\n", __func__, ret); 866 goto fail; 867 } 868 869 /* ready for ATM callbacks */ 870 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */ 871 mb(); 872 atm_dev->dev_data = instance; 873 874 /* submit all rx URBs */ 875 for (i = 0; i < num_rcv_urbs; i++) 876 usbatm_submit_urb(instance->urbs[i]); 877 878 return 0; 879 880 fail: 881 instance->atm_dev = NULL; 882 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */ 883 return ret; 884 } 885 886 887 /********** 888 ** USB ** 889 **********/ 890 891 static int usbatm_do_heavy_init(void *arg) 892 { 893 struct usbatm_data *instance = arg; 894 int ret; 895 896 daemonize(instance->driver->driver_name); 897 allow_signal(SIGTERM); 898 899 complete(&instance->thread_started); 900 901 ret = instance->driver->heavy_init(instance, instance->usb_intf); 902 903 if (!ret) 904 ret = usbatm_atm_init(instance); 905 906 down(&instance->serialize); 907 instance->thread_pid = -1; 908 up(&instance->serialize); 909 910 complete_and_exit(&instance->thread_exited, ret); 911 } 912 913 static int usbatm_heavy_init(struct usbatm_data *instance) 914 { 915 int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL); 916 917 if (ret < 0) { 918 usb_dbg(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret); 919 return ret; 920 } 921 922 down(&instance->serialize); 923 instance->thread_pid = ret; 924 up(&instance->serialize); 925 926 wait_for_completion(&instance->thread_started); 927 928 return 0; 929 } 930 931 static void usbatm_tasklet_schedule(unsigned long data) 932 { 933 tasklet_schedule((struct tasklet_struct *) data); 934 } 935 936 static inline void usbatm_init_channel(struct usbatm_channel *channel) 937 { 938 spin_lock_init(&channel->lock); 939 INIT_LIST_HEAD(&channel->list); 940 channel->delay.function = usbatm_tasklet_schedule; 941 channel->delay.data = (unsigned long) &channel->tasklet; 942 init_timer(&channel->delay); 943 } 944 945 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, 946 struct usbatm_driver *driver) 947 { 948 struct device *dev = &intf->dev; 949 struct usb_device *usb_dev = interface_to_usbdev(intf); 950 struct usbatm_data *instance; 951 char *buf; 952 int error = -ENOMEM; 953 int i, length; 954 int need_heavy; 955 956 dev_dbg(dev, "%s: trying driver %s with vendor=0x%x, product=0x%x, ifnum %d\n", 957 __func__, driver->driver_name, 958 le16_to_cpu(usb_dev->descriptor.idVendor), 959 le16_to_cpu(usb_dev->descriptor.idProduct), 960 intf->altsetting->desc.bInterfaceNumber); 961 962 /* instance init */ 963 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL); 964 if (!instance) { 965 dev_dbg(dev, "%s: no memory for instance data!\n", __func__); 966 return -ENOMEM; 967 } 968 969 /* public fields */ 970 971 instance->driver = driver; 972 snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name); 973 974 instance->usb_dev = usb_dev; 975 instance->usb_intf = intf; 976 977 buf = instance->description; 978 length = sizeof(instance->description); 979 980 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0) 981 goto bind; 982 983 buf += i; 984 length -= i; 985 986 i = scnprintf(buf, length, " ("); 987 buf += i; 988 length -= i; 989 990 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0) 991 goto bind; 992 993 buf += i; 994 length -= i; 995 996 snprintf(buf, length, ")"); 997 998 bind: 999 need_heavy = 1; 1000 if (driver->bind && (error = driver->bind(instance, intf, id, &need_heavy)) < 0) { 1001 dev_dbg(dev, "%s: bind failed: %d!\n", __func__, error); 1002 goto fail_free; 1003 } 1004 1005 /* private fields */ 1006 1007 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */ 1008 init_MUTEX(&instance->serialize); 1009 1010 instance->thread_pid = -1; 1011 init_completion(&instance->thread_started); 1012 init_completion(&instance->thread_exited); 1013 1014 INIT_LIST_HEAD(&instance->vcc_list); 1015 1016 usbatm_init_channel(&instance->rx_channel); 1017 usbatm_init_channel(&instance->tx_channel); 1018 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance); 1019 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance); 1020 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->in); 1021 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->out); 1022 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding; 1023 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding; 1024 instance->rx_channel.buf_size = rcv_buf_size * instance->rx_channel.stride; 1025 instance->tx_channel.buf_size = snd_buf_size * instance->tx_channel.stride; 1026 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance; 1027 1028 skb_queue_head_init(&instance->sndqueue); 1029 1030 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1031 struct urb *urb; 1032 u8 *buffer; 1033 unsigned int iso_packets = 0, iso_size = 0; 1034 struct usbatm_channel *channel = i < num_rcv_urbs ? 1035 &instance->rx_channel : &instance->tx_channel; 1036 1037 if (usb_pipeisoc(channel->endpoint)) { 1038 /* don't expect iso out endpoints */ 1039 iso_size = usb_maxpacket(instance->usb_dev, channel->endpoint, 0); 1040 iso_size -= iso_size % channel->stride; /* alignment */ 1041 BUG_ON(!iso_size); 1042 iso_packets = (channel->buf_size - 1) / iso_size + 1; 1043 } 1044 1045 urb = usb_alloc_urb(iso_packets, GFP_KERNEL); 1046 if (!urb) { 1047 dev_dbg(dev, "%s: no memory for urb %d!\n", __func__, i); 1048 goto fail_unbind; 1049 } 1050 1051 instance->urbs[i] = urb; 1052 1053 buffer = kmalloc(channel->buf_size, GFP_KERNEL); 1054 if (!buffer) { 1055 dev_dbg(dev, "%s: no memory for buffer %d!\n", __func__, i); 1056 goto fail_unbind; 1057 } 1058 memset(buffer, 0, channel->buf_size); 1059 1060 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint, 1061 buffer, channel->buf_size, usbatm_complete, channel); 1062 if (iso_packets) { 1063 int j; 1064 urb->interval = 1; 1065 urb->transfer_flags = URB_ISO_ASAP; 1066 urb->number_of_packets = iso_packets; 1067 for (j = 0; j < iso_packets; j++) { 1068 urb->iso_frame_desc[j].offset = iso_size * j; 1069 urb->iso_frame_desc[j].length = min_t(int, iso_size, 1070 channel->buf_size - urb->iso_frame_desc[j].offset); 1071 } 1072 } 1073 1074 /* put all tx URBs on the list of spares */ 1075 if (i >= num_rcv_urbs) 1076 list_add_tail(&urb->urb_list, &channel->list); 1077 1078 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p", 1079 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb); 1080 } 1081 1082 if (need_heavy && driver->heavy_init) { 1083 error = usbatm_heavy_init(instance); 1084 } else { 1085 complete(&instance->thread_exited); /* pretend that heavy_init was run */ 1086 error = usbatm_atm_init(instance); 1087 } 1088 1089 if (error < 0) 1090 goto fail_unbind; 1091 1092 usb_get_dev(usb_dev); 1093 usb_set_intfdata(intf, instance); 1094 1095 return 0; 1096 1097 fail_unbind: 1098 if (instance->driver->unbind) 1099 instance->driver->unbind(instance, intf); 1100 fail_free: 1101 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1102 if (instance->urbs[i]) 1103 kfree(instance->urbs[i]->transfer_buffer); 1104 usb_free_urb(instance->urbs[i]); 1105 } 1106 1107 kfree (instance); 1108 1109 return error; 1110 } 1111 EXPORT_SYMBOL_GPL(usbatm_usb_probe); 1112 1113 void usbatm_usb_disconnect(struct usb_interface *intf) 1114 { 1115 struct device *dev = &intf->dev; 1116 struct usbatm_data *instance = usb_get_intfdata(intf); 1117 int i; 1118 1119 dev_dbg(dev, "%s entered\n", __func__); 1120 1121 if (!instance) { 1122 dev_dbg(dev, "%s: NULL instance!\n", __func__); 1123 return; 1124 } 1125 1126 usb_set_intfdata(intf, NULL); 1127 1128 down(&instance->serialize); 1129 if (instance->thread_pid >= 0) 1130 kill_proc(instance->thread_pid, SIGTERM, 1); 1131 up(&instance->serialize); 1132 1133 wait_for_completion(&instance->thread_exited); 1134 1135 tasklet_disable(&instance->rx_channel.tasklet); 1136 tasklet_disable(&instance->tx_channel.tasklet); 1137 1138 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) 1139 usb_kill_urb(instance->urbs[i]); 1140 1141 del_timer_sync(&instance->rx_channel.delay); 1142 del_timer_sync(&instance->tx_channel.delay); 1143 1144 if (instance->atm_dev && instance->driver->atm_stop) 1145 instance->driver->atm_stop(instance, instance->atm_dev); 1146 1147 if (instance->driver->unbind) 1148 instance->driver->unbind(instance, intf); 1149 1150 instance->driver_data = NULL; 1151 1152 /* turn usbatm_[rt]x_process into noop */ 1153 /* no need to take the spinlock */ 1154 INIT_LIST_HEAD(&instance->rx_channel.list); 1155 INIT_LIST_HEAD(&instance->tx_channel.list); 1156 1157 tasklet_enable(&instance->rx_channel.tasklet); 1158 tasklet_enable(&instance->tx_channel.tasklet); 1159 1160 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1161 kfree(instance->urbs[i]->transfer_buffer); 1162 usb_free_urb(instance->urbs[i]); 1163 } 1164 1165 /* ATM finalize */ 1166 if (instance->atm_dev) 1167 atm_dev_deregister(instance->atm_dev); 1168 1169 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */ 1170 } 1171 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect); 1172 1173 1174 /*********** 1175 ** init ** 1176 ***********/ 1177 1178 static int __init usbatm_usb_init(void) 1179 { 1180 dbg("%s: driver version %s", __func__, DRIVER_VERSION); 1181 1182 if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) { 1183 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name); 1184 return -EIO; 1185 } 1186 1187 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS) 1188 || (num_snd_urbs > UDSL_MAX_SND_URBS) 1189 || (rcv_buf_size < 1) 1190 || (rcv_buf_size > UDSL_MAX_RCV_BUF_SIZE) 1191 || (snd_buf_size < 1) 1192 || (snd_buf_size > UDSL_MAX_SND_BUF_SIZE)) 1193 return -EINVAL; 1194 1195 return 0; 1196 } 1197 module_init(usbatm_usb_init); 1198 1199 static void __exit usbatm_usb_exit(void) 1200 { 1201 dbg("%s", __func__); 1202 } 1203 module_exit(usbatm_usb_exit); 1204 1205 MODULE_AUTHOR(DRIVER_AUTHOR); 1206 MODULE_DESCRIPTION(DRIVER_DESC); 1207 MODULE_LICENSE("GPL"); 1208 MODULE_VERSION(DRIVER_VERSION); 1209 1210 /************ 1211 ** debug ** 1212 ************/ 1213 1214 #ifdef VERBOSE_DEBUG 1215 static int usbatm_print_packet(const unsigned char *data, int len) 1216 { 1217 unsigned char buffer[256]; 1218 int i = 0, j = 0; 1219 1220 for (i = 0; i < len;) { 1221 buffer[0] = '\0'; 1222 sprintf(buffer, "%.3d :", i); 1223 for (j = 0; (j < 16) && (i < len); j++, i++) { 1224 sprintf(buffer, "%s %2.2x", buffer, data[i]); 1225 } 1226 dbg("%s", buffer); 1227 } 1228 return i; 1229 } 1230 #endif 1231