drivers/usb/atm/usbatm.c

   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/netdevice.h>
  76 #include <linux/proc_fs.h>
  77 #include <linux/sched.h>
  78 #include <linux/signal.h>
  79 #include <linux/slab.h>
  80 #include <linux/stat.h>
  81 #include <linux/timer.h>
  82 #include <linux/wait.h>
  83 #include <linux/kthread.h>
  84 #include <linux/ratelimit.h>
  85
  86 #ifdef VERBOSE_DEBUG
  87 static int usbatm_print_packet(const unsigned char *data, int len);
  88 #define PACKETDEBUG(arg...)     usbatm_print_packet(arg)
  89 #define vdbg(arg...)            dbg(arg)
  90 #else
  91 #define PACKETDEBUG(arg...)
  92 #define vdbg(arg...)
  93 #endif
  94
  95 #define DRIVER_AUTHOR   "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
  96 #define DRIVER_VERSION  "1.10"
  97 #define DRIVER_DESC     "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
  98
  99 static const char usbatm_driver_name[] = "usbatm";
 100
 101 #define UDSL_MAX_RCV_URBS               16
 102 #define UDSL_MAX_SND_URBS               16
 103 #define UDSL_MAX_BUF_SIZE               65536
 104 #define UDSL_DEFAULT_RCV_URBS           4
 105 #define UDSL_DEFAULT_SND_URBS           4
 106 #define UDSL_DEFAULT_RCV_BUF_SIZE       3392    /* 64 * ATM_CELL_SIZE */
 107 #define UDSL_DEFAULT_SND_BUF_SIZE       3392    /* 64 * ATM_CELL_SIZE */
 108
 109 #define ATM_CELL_HEADER                 (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
 110
 111 #define THROTTLE_MSECS                  100     /* delay to recover processing after urb submission fails */
 112
 113 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
 114 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
 115 static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
 116 static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE;
 117
 118 module_param(num_rcv_urbs, uint, S_IRUGO);
 119 MODULE_PARM_DESC(num_rcv_urbs,
 120                  "Number of urbs used for reception (range: 0-"
 121                  __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
 122                  __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
 123
 124 module_param(num_snd_urbs, uint, S_IRUGO);
 125 MODULE_PARM_DESC(num_snd_urbs,
 126                  "Number of urbs used for transmission (range: 0-"
 127                  __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
 128                  __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
 129
 130 module_param(rcv_buf_bytes, uint, S_IRUGO);
 131 MODULE_PARM_DESC(rcv_buf_bytes,
 132                  "Size of the buffers used for reception, in bytes (range: 1-"
 133                  __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
 134                  __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
 135
 136 module_param(snd_buf_bytes, uint, S_IRUGO);
 137 MODULE_PARM_DESC(snd_buf_bytes,
 138                  "Size of the buffers used for transmission, in bytes (range: 1-"
 139                  __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
 140                  __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
 141
 142
 143 /* receive */
 144
 145 struct usbatm_vcc_data {
 146         /* vpi/vci lookup */
 147         struct list_head list;
 148         short vpi;
 149         int vci;
 150         struct atm_vcc *vcc;
 151
 152         /* raw cell reassembly */
 153         struct sk_buff *sarb;
 154 };
 155
 156
 157 /* send */
 158
 159 struct usbatm_control {
 160         struct atm_skb_data atm;
 161         u32 len;
 162         u32 crc;
 163 };
 164
 165 #define UDSL_SKB(x)             ((struct usbatm_control *)(x)->cb)
 166
 167
 168 /* ATM */
 169
 170 static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
 171 static int usbatm_atm_open(struct atm_vcc *vcc);
 172 static void usbatm_atm_close(struct atm_vcc *vcc);
 173 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg);
 174 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
 175 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
 176
 177 static struct atmdev_ops usbatm_atm_devops = {
 178         .dev_close      = usbatm_atm_dev_close,
 179         .open           = usbatm_atm_open,
 180         .close          = usbatm_atm_close,
 181         .ioctl          = usbatm_atm_ioctl,
 182         .send           = usbatm_atm_send,
 183         .proc_read      = usbatm_atm_proc_read,
 184         .owner          = THIS_MODULE,
 185 };
 186
 187
 188 /***********
 189 **  misc  **
 190 ***********/
 191
 192 static inline unsigned int usbatm_pdu_length(unsigned int length)
 193 {
 194         length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
 195         return length - length % ATM_CELL_PAYLOAD;
 196 }
 197
 198 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 199 {
 200         if (vcc->pop)
 201                 vcc->pop(vcc, skb);
 202         else
 203                 dev_kfree_skb_any(skb);
 204 }
 205
 206
 207 /***********
 208 **  urbs  **
 209 ************/
 210
 211 static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
 212 {
 213         struct urb *urb;
 214
 215         spin_lock_irq(&channel->lock);
 216         if (list_empty(&channel->list)) {
 217                 spin_unlock_irq(&channel->lock);
 218                 return NULL;
 219         }
 220
 221         urb = list_entry(channel->list.next, struct urb, urb_list);
 222         list_del(&urb->urb_list);
 223         spin_unlock_irq(&channel->lock);
 224
 225         return urb;
 226 }
 227
 228 static int usbatm_submit_urb(struct urb *urb)
 229 {
 230         struct usbatm_channel *channel = urb->context;
 231         int ret;
 232
 233         vdbg("%s: submitting urb 0x%p, size %u",
 234              __func__, urb, urb->transfer_buffer_length);
 235
 236         ret = usb_submit_urb(urb, GFP_ATOMIC);
 237         if (ret) {
 238                 if (printk_ratelimit())
 239                         atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
 240                                 __func__, urb, ret);
 241
 242                 /* consider all errors transient and return the buffer back to the queue */
 243                 urb->status = -EAGAIN;
 244                 spin_lock_irq(&channel->lock);
 245
 246                 /* must add to the front when sending; doesn't matter when receiving */
 247                 list_add(&urb->urb_list, &channel->list);
 248
 249                 spin_unlock_irq(&channel->lock);
 250
 251                 /* make sure the channel doesn't stall */
 252                 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
 253         }
 254
 255         return ret;
 256 }
 257
 258 static void usbatm_complete(struct urb *urb)
 259 {
 260         struct usbatm_channel *channel = urb->context;
 261         unsigned long flags;
 262         int status = urb->status;
 263
 264         vdbg("%s: urb 0x%p, status %d, actual_length %d",
 265              __func__, urb, status, urb->actual_length);
 266
 267         /* usually in_interrupt(), but not always */
 268         spin_lock_irqsave(&channel->lock, flags);
 269
 270         /* must add to the back when receiving; doesn't matter when sending */
 271         list_add_tail(&urb->urb_list, &channel->list);
 272
 273         spin_unlock_irqrestore(&channel->lock, flags);
 274
 275         if (unlikely(status) &&
 276                         (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
 277                          status != -EILSEQ)) {
 278                 if (status == -ESHUTDOWN)
 279                         return;
 280
 281                 if (printk_ratelimit())
 282                         atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
 283                                 __func__, urb, status);
 284                 /* throttle processing in case of an error */
 285                 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
 286         } else
 287                 tasklet_schedule(&channel->tasklet);
 288 }
 289
 290
 291 /*************
 292 **  decode  **
 293 *************/
 294
 295 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
 296                                                   short vpi, int vci)
 297 {
 298         struct usbatm_vcc_data *vcc_data;
 299
 300         list_for_each_entry(vcc_data, &instance->vcc_list, list)
 301                 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
 302                         return vcc_data;
 303         return NULL;
 304 }
 305
 306 static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
 307 {
 308         struct atm_vcc *vcc;
 309         struct sk_buff *sarb;
 310         short vpi = ((source[0] & 0x0f) << 4)  | (source[1] >> 4);
 311         int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
 312         u8 pti = ((source[3] & 0xe) >> 1);
 313
 314         vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
 315
 316         if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
 317                 instance->cached_vpi = vpi;
 318                 instance->cached_vci = vci;
 319
 320                 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
 321
 322                 if (!instance->cached_vcc)
 323                         atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
 324         }
 325
 326         if (!instance->cached_vcc)
 327                 return;
 328
 329         vcc = instance->cached_vcc->vcc;
 330
 331         /* OAM F5 end-to-end */
 332         if (pti == ATM_PTI_E2EF5) {
 333                 if (printk_ratelimit())
 334                         atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
 335                                 __func__, vpi, vci);
 336                 atomic_inc(&vcc->stats->rx_err);
 337                 return;
 338         }
 339
 340         sarb = instance->cached_vcc->sarb;
 341
 342         if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
 343                 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
 344                                 __func__, sarb->len, vcc);
 345                 /* discard cells already received */
 346                 skb_trim(sarb, 0);
 347                 UDSL_ASSERT(instance, sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
 348         }
 349
 350         memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
 351         __skb_put(sarb, ATM_CELL_PAYLOAD);
 352
 353         if (pti & 1) {
 354                 struct sk_buff *skb;
 355                 unsigned int length;
 356                 unsigned int pdu_length;
 357
 358                 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
 359
 360                 /* guard against overflow */
 361                 if (length > ATM_MAX_AAL5_PDU) {
 362                         atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
 363                                   __func__, length, vcc);
 364                         atomic_inc(&vcc->stats->rx_err);
 365                         goto out;
 366                 }
 367
 368                 pdu_length = usbatm_pdu_length(length);
 369
 370                 if (sarb->len < pdu_length) {
 371                         atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
 372                                   __func__, pdu_length, sarb->len, vcc);
 373                         atomic_inc(&vcc->stats->rx_err);
 374                         goto out;
 375                 }
 376
 377                 if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) {
 378                         atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
 379                                   __func__, vcc);
 380                         atomic_inc(&vcc->stats->rx_err);
 381                         goto out;
 382                 }
 383
 384                 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
 385
 386                 if (!(skb = dev_alloc_skb(length))) {
 387                         if (printk_ratelimit())
 388                                 atm_err(instance, "%s: no memory for skb (length: %u)!\n",
 389                                         __func__, length);
 390                         atomic_inc(&vcc->stats->rx_drop);
 391                         goto out;
 392                 }
 393
 394                 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
 395
 396                 if (!atm_charge(vcc, skb->truesize)) {
 397                         atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
 398                                   __func__, skb->truesize);
 399                         dev_kfree_skb_any(skb);
 400                         goto out;       /* atm_charge increments rx_drop */
 401                 }
 402
 403                 skb_copy_to_linear_data(skb,
 404                                         skb_tail_pointer(sarb) - pdu_length,
 405                                         length);
 406                 __skb_put(skb, length);
 407
 408                 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
 409                      __func__, skb, skb->len, skb->truesize);
 410
 411                 PACKETDEBUG(skb->data, skb->len);
 412
 413                 vcc->push(vcc, skb);
 414
 415                 atomic_inc(&vcc->stats->rx);
 416         out:
 417                 skb_trim(sarb, 0);
 418         }
 419 }
 420
 421 static void usbatm_extract_cells(struct usbatm_data *instance,
 422                 unsigned char *source, unsigned int avail_data)
 423 {
 424         unsigned int stride = instance->rx_channel.stride;
 425         unsigned int buf_usage = instance->buf_usage;
 426
 427         /* extract cells from incoming data, taking into account that
 428          * the length of avail data may not be a multiple of stride */
 429
 430         if (buf_usage > 0) {
 431                 /* we have a partially received atm cell */
 432                 unsigned char *cell_buf = instance->cell_buf;
 433                 unsigned int space_left = stride - buf_usage;
 434
 435                 UDSL_ASSERT(instance, buf_usage <= stride);
 436
 437                 if (avail_data >= space_left) {
 438                         /* add new data and process cell */
 439                         memcpy(cell_buf + buf_usage, source, space_left);
 440                         source += space_left;
 441                         avail_data -= space_left;
 442                         usbatm_extract_one_cell(instance, cell_buf);
 443                         instance->buf_usage = 0;
 444                 } else {
 445                         /* not enough data to fill the cell */
 446                         memcpy(cell_buf + buf_usage, source, avail_data);
 447                         instance->buf_usage = buf_usage + avail_data;
 448                         return;
 449                 }
 450         }
 451
 452         for (; avail_data >= stride; avail_data -= stride, source += stride)
 453                 usbatm_extract_one_cell(instance, source);
 454
 455         if (avail_data > 0) {
 456                 /* length was not a multiple of stride -
 457                  * save remaining data for next call */
 458                 memcpy(instance->cell_buf, source, avail_data);
 459                 instance->buf_usage = avail_data;
 460         }
 461 }
 462
 463
 464 /*************
 465 **  encode  **
 466 *************/
 467
 468 static unsigned int usbatm_write_cells(struct usbatm_data *instance,
 469                                        struct sk_buff *skb,
 470                                        u8 *target, unsigned int avail_space)
 471 {
 472         struct usbatm_control *ctrl = UDSL_SKB(skb);
 473         struct atm_vcc *vcc = ctrl->atm.vcc;
 474         unsigned int bytes_written;
 475         unsigned int stride = instance->tx_channel.stride;
 476
 477         vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
 478         UDSL_ASSERT(instance, !(avail_space % stride));
 479
 480         for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
 481              bytes_written += stride, target += stride) {
 482                 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
 483                 unsigned int left = ATM_CELL_PAYLOAD - data_len;
 484                 u8 *ptr = target;
 485
 486                 ptr[0] = vcc->vpi >> 4;
 487                 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
 488                 ptr[2] = vcc->vci >> 4;
 489                 ptr[3] = vcc->vci << 4;
 490                 ptr[4] = 0xec;
 491                 ptr += ATM_CELL_HEADER;
 492
 493                 skb_copy_from_linear_data(skb, ptr, data_len);
 494                 ptr += data_len;
 495                 __skb_pull(skb, data_len);
 496
 497                 if (!left)
 498                         continue;
 499
 500                 memset(ptr, 0, left);
 501
 502                 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
 503                         u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
 504                         /* trailer[0] = 0;              UU = 0 */
 505                         /* trailer[1] = 0;              CPI = 0 */
 506                         trailer[2] = ctrl->len >> 8;
 507                         trailer[3] = ctrl->len;
 508
 509                         ctrl->crc = ~crc32_be(ctrl->crc, ptr, left - 4);
 510
 511                         trailer[4] = ctrl->crc >> 24;
 512                         trailer[5] = ctrl->crc >> 16;
 513                         trailer[6] = ctrl->crc >> 8;
 514                         trailer[7] = ctrl->crc;
 515
 516                         target[3] |= 0x2;       /* adjust PTI */
 517
 518                         ctrl->len = 0;          /* tag this skb finished */
 519                 } else
 520                         ctrl->crc = crc32_be(ctrl->crc, ptr, left);
 521         }
 522
 523         return bytes_written;
 524 }
 525
 526
 527 /**************
 528 **  receive  **
 529 **************/
 530
 531 static void usbatm_rx_process(unsigned long data)
 532 {
 533         struct usbatm_data *instance = (struct usbatm_data *)data;
 534         struct urb *urb;
 535
 536         while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
 537                 vdbg("%s: processing urb 0x%p", __func__, urb);
 538
 539                 if (usb_pipeisoc(urb->pipe)) {
 540                         unsigned char *merge_start = NULL;
 541                         unsigned int merge_length = 0;
 542                         const unsigned int packet_size = instance->rx_channel.packet_size;
 543                         int i;
 544
 545                         for (i = 0; i < urb->number_of_packets; i++) {
 546                                 if (!urb->iso_frame_desc[i].status) {
 547                                         unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
 548
 549                                         UDSL_ASSERT(instance, actual_length <= packet_size);
 550
 551                                         if (!merge_length)
 552                                                 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 553                                         merge_length += actual_length;
 554                                         if (merge_length && (actual_length < packet_size)) {
 555                                                 usbatm_extract_cells(instance, merge_start, merge_length);
 556                                                 merge_length = 0;
 557                                         }
 558                                 } else {
 559                                         atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
 560                                         if (merge_length)
 561                                                 usbatm_extract_cells(instance, merge_start, merge_length);
 562                                         merge_length = 0;
 563                                         instance->buf_usage = 0;
 564                                 }
 565                         }
 566
 567                         if (merge_length)
 568                                 usbatm_extract_cells(instance, merge_start, merge_length);
 569                 } else
 570                         if (!urb->status)
 571                                 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
 572                         else
 573                                 instance->buf_usage = 0;
 574
 575                 if (usbatm_submit_urb(urb))
 576                         return;
 577         }
 578 }
 579
 580
 581 /***********
 582 **  send  **
 583 ***********/
 584
 585 static void usbatm_tx_process(unsigned long data)
 586 {
 587         struct usbatm_data *instance = (struct usbatm_data *)data;
 588         struct sk_buff *skb = instance->current_skb;
 589         struct urb *urb = NULL;
 590         const unsigned int buf_size = instance->tx_channel.buf_size;
 591         unsigned int bytes_written = 0;
 592         u8 *buffer = NULL;
 593
 594         if (!skb)
 595                 skb = skb_dequeue(&instance->sndqueue);
 596
 597         while (skb) {
 598                 if (!urb) {
 599                         urb = usbatm_pop_urb(&instance->tx_channel);
 600                         if (!urb)
 601                                 break;          /* no more senders */
 602                         buffer = urb->transfer_buffer;
 603                         bytes_written = (urb->status == -EAGAIN) ?
 604                                 urb->transfer_buffer_length : 0;
 605                 }
 606
 607                 bytes_written += usbatm_write_cells(instance, skb,
 608                                                   buffer + bytes_written,
 609                                                   buf_size - bytes_written);
 610
 611                 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
 612                      __func__, bytes_written, skb, urb);
 613
 614                 if (!UDSL_SKB(skb)->len) {
 615                         struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
 616
 617                         usbatm_pop(vcc, skb);
 618                         atomic_inc(&vcc->stats->tx);
 619
 620                         skb = skb_dequeue(&instance->sndqueue);
 621                 }
 622
 623                 if (bytes_written == buf_size || (!skb && bytes_written)) {
 624                         urb->transfer_buffer_length = bytes_written;
 625
 626                         if (usbatm_submit_urb(urb))
 627                                 break;
 628                         urb = NULL;
 629                 }
 630         }
 631
 632         instance->current_skb = skb;
 633 }
 634
 635 static void usbatm_cancel_send(struct usbatm_data *instance,
 636                                struct atm_vcc *vcc)
 637 {
 638         struct sk_buff *skb, *n;
 639
 640         atm_dbg(instance, "%s entered\n", __func__);
 641         spin_lock_irq(&instance->sndqueue.lock);
 642         skb_queue_walk_safe(&instance->sndqueue, skb, n) {
 643                 if (UDSL_SKB(skb)->atm.vcc == vcc) {
 644                         atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
 645                         __skb_unlink(skb, &instance->sndqueue);
 646                         usbatm_pop(vcc, skb);
 647                 }
 648         }
 649         spin_unlock_irq(&instance->sndqueue.lock);
 650
 651         tasklet_disable(&instance->tx_channel.tasklet);
 652         if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
 653                 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
 654                 instance->current_skb = NULL;
 655                 usbatm_pop(vcc, skb);
 656         }
 657         tasklet_enable(&instance->tx_channel.tasklet);
 658         atm_dbg(instance, "%s done\n", __func__);
 659 }
 660
 661 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 662 {
 663         struct usbatm_data *instance = vcc->dev->dev_data;
 664         struct usbatm_control *ctrl = UDSL_SKB(skb);
 665         int err;
 666
 667         vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
 668
 669         /* racy disconnection check - fine */
 670         if (!instance || instance->disconnected) {
 671 #ifdef DEBUG
 672                 printk_ratelimited(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
 673 #endif
 674                 err = -ENODEV;
 675                 goto fail;
 676         }
 677
 678         if (vcc->qos.aal != ATM_AAL5) {
 679                 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
 680                 err = -EINVAL;
 681                 goto fail;
 682         }
 683
 684         if (skb->len > ATM_MAX_AAL5_PDU) {
 685                 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
 686                                 __func__, skb->len, ATM_MAX_AAL5_PDU);
 687                 err = -EINVAL;
 688                 goto fail;
 689         }
 690
 691         PACKETDEBUG(skb->data, skb->len);
 692
 693         /* initialize the control block */
 694         ctrl->atm.vcc = vcc;
 695         ctrl->len = skb->len;
 696         ctrl->crc = crc32_be(~0, skb->data, skb->len);
 697
 698         skb_queue_tail(&instance->sndqueue, skb);
 699         tasklet_schedule(&instance->tx_channel.tasklet);
 700
 701         return 0;
 702
 703  fail:
 704         usbatm_pop(vcc, skb);
 705         return err;
 706 }
 707
 708
 709 /********************
 710 **  bean counting  **
 711 ********************/
 712
 713 static void usbatm_destroy_instance(struct kref *kref)
 714 {
 715         struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
 716
 717         dbg("%s", __func__);
 718
 719         tasklet_kill(&instance->rx_channel.tasklet);
 720         tasklet_kill(&instance->tx_channel.tasklet);
 721         usb_put_dev(instance->usb_dev);
 722         kfree(instance);
 723 }
 724
 725 static void usbatm_get_instance(struct usbatm_data *instance)
 726 {
 727         dbg("%s", __func__);
 728
 729         kref_get(&instance->refcount);
 730 }
 731
 732 static void usbatm_put_instance(struct usbatm_data *instance)
 733 {
 734         dbg("%s", __func__);
 735
 736         kref_put(&instance->refcount, usbatm_destroy_instance);
 737 }
 738
 739
 740 /**********
 741 **  ATM  **
 742 **********/
 743
 744 static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
 745 {
 746         struct usbatm_data *instance = atm_dev->dev_data;
 747
 748         dbg("%s", __func__);
 749
 750         if (!instance)
 751                 return;
 752
 753         atm_dev->dev_data = NULL; /* catch bugs */
 754         usbatm_put_instance(instance);  /* taken in usbatm_atm_init */
 755 }
 756
 757 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
 758 {
 759         struct usbatm_data *instance = atm_dev->dev_data;
 760         int left = *pos;
 761
 762         if (!instance) {
 763                 dbg("%s: NULL instance!", __func__);
 764                 return -ENODEV;
 765         }
 766
 767         if (!left--)
 768                 return sprintf(page, "%s\n", instance->description);
 769
 770         if (!left--)
 771                 return sprintf(page, "MAC: %pM\n", atm_dev->esi);
 772
 773         if (!left--)
 774                 return sprintf(page,
 775                                "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
 776                                atomic_read(&atm_dev->stats.aal5.tx),
 777                                atomic_read(&atm_dev->stats.aal5.tx_err),
 778                                atomic_read(&atm_dev->stats.aal5.rx),
 779                                atomic_read(&atm_dev->stats.aal5.rx_err),
 780                                atomic_read(&atm_dev->stats.aal5.rx_drop));
 781
 782         if (!left--) {
 783                 if (instance->disconnected)
 784                         return sprintf(page, "Disconnected\n");
 785                 else
 786                         switch (atm_dev->signal) {
 787                         case ATM_PHY_SIG_FOUND:
 788                                 return sprintf(page, "Line up\n");
 789                         case ATM_PHY_SIG_LOST:
 790                                 return sprintf(page, "Line down\n");
 791                         default:
 792                                 return sprintf(page, "Line state unknown\n");
 793                         }
 794         }
 795
 796         return 0;
 797 }
 798
 799 static int usbatm_atm_open(struct atm_vcc *vcc)
 800 {
 801         struct usbatm_data *instance = vcc->dev->dev_data;
 802         struct usbatm_vcc_data *new = NULL;
 803         int ret;
 804         int vci = vcc->vci;
 805         short vpi = vcc->vpi;
 806
 807         if (!instance) {
 808                 dbg("%s: NULL data!", __func__);
 809                 return -ENODEV;
 810         }
 811
 812         atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
 813
 814         /* only support AAL5 */
 815         if ((vcc->qos.aal != ATM_AAL5)) {
 816                 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
 817                 return -EINVAL;
 818         }
 819
 820         /* sanity checks */
 821         if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
 822                 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
 823                 return -EINVAL;
 824         }
 825
 826         mutex_lock(&instance->serialize);       /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
 827
 828         if (instance->disconnected) {
 829                 atm_dbg(instance, "%s: disconnected!\n", __func__);
 830                 ret = -ENODEV;
 831                 goto fail;
 832         }
 833
 834         if (usbatm_find_vcc(instance, vpi, vci)) {
 835                 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
 836                 ret = -EADDRINUSE;
 837                 goto fail;
 838         }
 839
 840         if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
 841                 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
 842                 ret = -ENOMEM;
 843                 goto fail;
 844         }
 845
 846         new->vcc = vcc;
 847         new->vpi = vpi;
 848         new->vci = vci;
 849
 850         new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
 851         if (!new->sarb) {
 852                 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
 853                 ret = -ENOMEM;
 854                 goto fail;
 855         }
 856
 857         vcc->dev_data = new;
 858
 859         tasklet_disable(&instance->rx_channel.tasklet);
 860         instance->cached_vcc = new;
 861         instance->cached_vpi = vpi;
 862         instance->cached_vci = vci;
 863         list_add(&new->list, &instance->vcc_list);
 864         tasklet_enable(&instance->rx_channel.tasklet);
 865
 866         set_bit(ATM_VF_ADDR, &vcc->flags);
 867         set_bit(ATM_VF_PARTIAL, &vcc->flags);
 868         set_bit(ATM_VF_READY, &vcc->flags);
 869
 870         mutex_unlock(&instance->serialize);
 871
 872         atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
 873
 874         return 0;
 875
 876 fail:
 877         kfree(new);
 878         mutex_unlock(&instance->serialize);
 879         return ret;
 880 }
 881
 882 static void usbatm_atm_close(struct atm_vcc *vcc)
 883 {
 884         struct usbatm_data *instance = vcc->dev->dev_data;
 885         struct usbatm_vcc_data *vcc_data = vcc->dev_data;
 886
 887         if (!instance || !vcc_data) {
 888                 dbg("%s: NULL data!", __func__);
 889                 return;
 890         }
 891
 892         atm_dbg(instance, "%s entered\n", __func__);
 893
 894         atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
 895                 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
 896
 897         usbatm_cancel_send(instance, vcc);
 898
 899         mutex_lock(&instance->serialize);       /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
 900
 901         tasklet_disable(&instance->rx_channel.tasklet);
 902         if (instance->cached_vcc == vcc_data) {
 903                 instance->cached_vcc = NULL;
 904                 instance->cached_vpi = ATM_VPI_UNSPEC;
 905                 instance->cached_vci = ATM_VCI_UNSPEC;
 906         }
 907         list_del(&vcc_data->list);
 908         tasklet_enable(&instance->rx_channel.tasklet);
 909
 910         kfree_skb(vcc_data->sarb);
 911         vcc_data->sarb = NULL;
 912
 913         kfree(vcc_data);
 914         vcc->dev_data = NULL;
 915
 916         vcc->vpi = ATM_VPI_UNSPEC;
 917         vcc->vci = ATM_VCI_UNSPEC;
 918         clear_bit(ATM_VF_READY, &vcc->flags);
 919         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
 920         clear_bit(ATM_VF_ADDR, &vcc->flags);
 921
 922         mutex_unlock(&instance->serialize);
 923
 924         atm_dbg(instance, "%s successful\n", __func__);
 925 }
 926
 927 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
 928                           void __user * arg)
 929 {
 930         struct usbatm_data *instance = atm_dev->dev_data;
 931
 932         if (!instance || instance->disconnected) {
 933                 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance");
 934                 return -ENODEV;
 935         }
 936
 937         switch (cmd) {
 938         case ATM_QUERYLOOP:
 939                 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
 940         default:
 941                 return -ENOIOCTLCMD;
 942         }
 943 }
 944
 945 static int usbatm_atm_init(struct usbatm_data *instance)
 946 {
 947         struct atm_dev *atm_dev;
 948         int ret, i;
 949
 950         /* ATM init.  The ATM initialization scheme suffers from an intrinsic race
 951          * condition: callbacks we register can be executed at once, before we have
 952          * initialized the struct atm_dev.  To protect against this, all callbacks
 953          * abort if atm_dev->dev_data is NULL. */
 954         atm_dev = atm_dev_register(instance->driver_name,
 955                                    &instance->usb_intf->dev, &usbatm_atm_devops,
 956                                    -1, NULL);
 957         if (!atm_dev) {
 958                 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
 959                 return -1;
 960         }
 961
 962         instance->atm_dev = atm_dev;
 963
 964         atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
 965         atm_dev->ci_range.vci_bits = ATM_CI_MAX;
 966         atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
 967
 968         /* temp init ATM device, set to 128kbit */
 969         atm_dev->link_rate = 128 * 1000 / 424;
 970
 971         if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
 972                 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
 973                 goto fail;
 974         }
 975
 976         usbatm_get_instance(instance);  /* dropped in usbatm_atm_dev_close */
 977
 978         /* ready for ATM callbacks */
 979         mb();
 980         atm_dev->dev_data = instance;
 981
 982         /* submit all rx URBs */
 983         for (i = 0; i < num_rcv_urbs; i++)
 984                 usbatm_submit_urb(instance->urbs[i]);
 985
 986         return 0;
 987
 988  fail:
 989         instance->atm_dev = NULL;
 990         atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
 991         return ret;
 992 }
 993
 994
 995 /**********
 996 **  USB  **
 997 **********/
 998
 999 static int usbatm_do_heavy_init(void *arg)
1000 {
1001         struct usbatm_data *instance = arg;
1002         int ret;
1003
1004         allow_signal(SIGTERM);
1005         complete(&instance->thread_started);
1006
1007         ret = instance->driver->heavy_init(instance, instance->usb_intf);
1008
1009         if (!ret)
1010                 ret = usbatm_atm_init(instance);
1011
1012         mutex_lock(&instance->serialize);
1013         instance->thread = NULL;
1014         mutex_unlock(&instance->serialize);
1015
1016         complete_and_exit(&instance->thread_exited, ret);
1017 }
1018
1019 static int usbatm_heavy_init(struct usbatm_data *instance)
1020 {
1021         struct task_struct *t;
1022
1023         t = kthread_create(usbatm_do_heavy_init, instance,
1024                         instance->driver->driver_name);
1025         if (IS_ERR(t)) {
1026                 usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n",
1027                                 __func__, PTR_ERR(t));
1028                 return PTR_ERR(t);
1029         }
1030
1031         instance->thread = t;
1032         wake_up_process(t);
1033         wait_for_completion(&instance->thread_started);
1034
1035         return 0;
1036 }
1037
1038 static void usbatm_tasklet_schedule(unsigned long data)
1039 {
1040         tasklet_schedule((struct tasklet_struct *) data);
1041 }
1042
1043 static void usbatm_init_channel(struct usbatm_channel *channel)
1044 {
1045         spin_lock_init(&channel->lock);
1046         INIT_LIST_HEAD(&channel->list);
1047         channel->delay.function = usbatm_tasklet_schedule;
1048         channel->delay.data = (unsigned long) &channel->tasklet;
1049         init_timer(&channel->delay);
1050 }
1051
1052 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
1053                      struct usbatm_driver *driver)
1054 {
1055         struct device *dev = &intf->dev;
1056         struct usb_device *usb_dev = interface_to_usbdev(intf);
1057         struct usbatm_data *instance;
1058         char *buf;
1059         int error = -ENOMEM;
1060         int i, length;
1061         unsigned int maxpacket, num_packets;
1062
1063         dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",
1064                         __func__, driver->driver_name,
1065                         le16_to_cpu(usb_dev->descriptor.idVendor),
1066                         le16_to_cpu(usb_dev->descriptor.idProduct),
1067                         intf->altsetting->desc.bInterfaceNumber);
1068
1069         /* instance init */
1070         instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
1071         if (!instance) {
1072                 dev_err(dev, "%s: no memory for instance data!\n", __func__);
1073                 return -ENOMEM;
1074         }
1075
1076         /* public fields */
1077
1078         instance->driver = driver;
1079         snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
1080
1081         instance->usb_dev = usb_dev;
1082         instance->usb_intf = intf;
1083
1084         buf = instance->description;
1085         length = sizeof(instance->description);
1086
1087         if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
1088                 goto bind;
1089
1090         buf += i;
1091         length -= i;
1092
1093         i = scnprintf(buf, length, " (");
1094         buf += i;
1095         length -= i;
1096
1097         if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1098                 goto bind;
1099
1100         buf += i;
1101         length -= i;
1102
1103         snprintf(buf, length, ")");
1104
1105  bind:
1106         if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
1107                         dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
1108                         goto fail_free;
1109         }
1110
1111         /* private fields */
1112
1113         kref_init(&instance->refcount);         /* dropped in usbatm_usb_disconnect */
1114         mutex_init(&instance->serialize);
1115
1116         instance->thread = NULL;
1117         init_completion(&instance->thread_started);
1118         init_completion(&instance->thread_exited);
1119
1120         INIT_LIST_HEAD(&instance->vcc_list);
1121         skb_queue_head_init(&instance->sndqueue);
1122
1123         usbatm_init_channel(&instance->rx_channel);
1124         usbatm_init_channel(&instance->tx_channel);
1125         tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1126         tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
1127         instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1128         instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1129         instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1130
1131         if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
1132                 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
1133         else
1134                 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
1135
1136         instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
1137
1138         /* tx buffer size must be a positive multiple of the stride */
1139         instance->tx_channel.buf_size = max(instance->tx_channel.stride,
1140                         snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
1141
1142         /* rx buffer size must be a positive multiple of the endpoint maxpacket */
1143         maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0);
1144
1145         if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
1146                 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
1147                                 usb_pipeendpoint(instance->rx_channel.endpoint));
1148                 error = -EINVAL;
1149                 goto fail_unbind;
1150         }
1151
1152         num_packets = max(1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
1153
1154         if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
1155                 num_packets--;
1156
1157         instance->rx_channel.buf_size = num_packets * maxpacket;
1158         instance->rx_channel.packet_size = maxpacket;
1159
1160 #ifdef DEBUG
1161         for (i = 0; i < 2; i++) {
1162                 struct usbatm_channel *channel = i ?
1163                         &instance->tx_channel : &instance->rx_channel;
1164
1165                 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel);
1166         }
1167 #endif
1168
1169         /* initialize urbs */
1170
1171         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1172                 u8 *buffer;
1173                 struct usbatm_channel *channel = i < num_rcv_urbs ?
1174                         &instance->rx_channel : &instance->tx_channel;
1175                 struct urb *urb;
1176                 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
1177
1178                 UDSL_ASSERT(instance, !usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint));
1179
1180                 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1181                 if (!urb) {
1182                         dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
1183                         error = -ENOMEM;
1184                         goto fail_unbind;
1185                 }
1186
1187                 instance->urbs[i] = urb;
1188
1189                 /* zero the tx padding to avoid leaking information */
1190                 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
1191                 if (!buffer) {
1192                         dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
1193                         error = -ENOMEM;
1194                         goto fail_unbind;
1195                 }
1196
1197                 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1198                                   buffer, channel->buf_size, usbatm_complete, channel);
1199                 if (iso_packets) {
1200                         int j;
1201                         urb->interval = 1;
1202                         urb->transfer_flags = URB_ISO_ASAP;
1203                         urb->number_of_packets = iso_packets;
1204                         for (j = 0; j < iso_packets; j++) {
1205                                 urb->iso_frame_desc[j].offset = channel->packet_size * j;
1206                                 urb->iso_frame_desc[j].length = channel->packet_size;
1207                         }
1208                 }
1209
1210                 /* put all tx URBs on the list of spares */
1211                 if (i >= num_rcv_urbs)
1212                         list_add_tail(&urb->urb_list, &channel->list);
1213
1214                 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1215                      __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
1216         }
1217
1218         instance->cached_vpi = ATM_VPI_UNSPEC;
1219         instance->cached_vci = ATM_VCI_UNSPEC;
1220         instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
1221
1222         if (!instance->cell_buf) {
1223                 dev_err(dev, "%s: no memory for cell buffer!\n", __func__);
1224                 error = -ENOMEM;
1225                 goto fail_unbind;
1226         }
1227
1228         if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
1229                 error = usbatm_heavy_init(instance);
1230         } else {
1231                 complete(&instance->thread_exited);     /* pretend that heavy_init was run */
1232                 error = usbatm_atm_init(instance);
1233         }
1234
1235         if (error < 0)
1236                 goto fail_unbind;
1237
1238         usb_get_dev(usb_dev);
1239         usb_set_intfdata(intf, instance);
1240
1241         return 0;
1242
1243  fail_unbind:
1244         if (instance->driver->unbind)
1245                 instance->driver->unbind(instance, intf);
1246  fail_free:
1247         kfree(instance->cell_buf);
1248
1249         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1250                 if (instance->urbs[i])
1251                         kfree(instance->urbs[i]->transfer_buffer);
1252                 usb_free_urb(instance->urbs[i]);
1253         }
1254
1255         kfree(instance);
1256
1257         return error;
1258 }
1259 EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1260
1261 void usbatm_usb_disconnect(struct usb_interface *intf)
1262 {
1263         struct device *dev = &intf->dev;
1264         struct usbatm_data *instance = usb_get_intfdata(intf);
1265         struct usbatm_vcc_data *vcc_data;
1266         int i;
1267
1268         dev_dbg(dev, "%s entered\n", __func__);
1269
1270         if (!instance) {
1271                 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1272                 return;
1273         }
1274
1275         usb_set_intfdata(intf, NULL);
1276
1277         mutex_lock(&instance->serialize);
1278         instance->disconnected = 1;
1279         if (instance->thread != NULL)
1280                 send_sig(SIGTERM, instance->thread, 1);
1281         mutex_unlock(&instance->serialize);
1282
1283         wait_for_completion(&instance->thread_exited);
1284
1285         mutex_lock(&instance->serialize);
1286         list_for_each_entry(vcc_data, &instance->vcc_list, list)
1287                 vcc_release_async(vcc_data->vcc, -EPIPE);
1288         mutex_unlock(&instance->serialize);
1289
1290         tasklet_disable(&instance->rx_channel.tasklet);
1291         tasklet_disable(&instance->tx_channel.tasklet);
1292
1293         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1294                 usb_kill_urb(instance->urbs[i]);
1295
1296         del_timer_sync(&instance->rx_channel.delay);
1297         del_timer_sync(&instance->tx_channel.delay);
1298
1299         /* turn usbatm_[rt]x_process into something close to a no-op */
1300         /* no need to take the spinlock */
1301         INIT_LIST_HEAD(&instance->rx_channel.list);
1302         INIT_LIST_HEAD(&instance->tx_channel.list);
1303
1304         tasklet_enable(&instance->rx_channel.tasklet);
1305         tasklet_enable(&instance->tx_channel.tasklet);
1306
1307         if (instance->atm_dev && instance->driver->atm_stop)
1308                 instance->driver->atm_stop(instance, instance->atm_dev);
1309
1310         if (instance->driver->unbind)
1311                 instance->driver->unbind(instance, intf);
1312
1313         instance->driver_data = NULL;
1314
1315         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1316                 kfree(instance->urbs[i]->transfer_buffer);
1317                 usb_free_urb(instance->urbs[i]);
1318         }
1319
1320         kfree(instance->cell_buf);
1321
1322         /* ATM finalize */
1323         if (instance->atm_dev) {
1324                 atm_dev_deregister(instance->atm_dev);
1325                 instance->atm_dev = NULL;
1326         }
1327
1328         usbatm_put_instance(instance);  /* taken in usbatm_usb_probe */
1329 }
1330 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1331
1332
1333 /***********
1334 **  init  **
1335 ***********/
1336
1337 static int __init usbatm_usb_init(void)
1338 {
1339         dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1340
1341         if (sizeof(struct usbatm_control) > FIELD_SIZEOF(struct sk_buff, cb)) {
1342                 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1343                 return -EIO;
1344         }
1345
1346         if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1347             || (num_snd_urbs > UDSL_MAX_SND_URBS)
1348             || (rcv_buf_bytes < 1)
1349             || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
1350             || (snd_buf_bytes < 1)
1351             || (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
1352                 return -EINVAL;
1353
1354         return 0;
1355 }
1356 module_init(usbatm_usb_init);
1357
1358 static void __exit usbatm_usb_exit(void)
1359 {
1360         dbg("%s", __func__);
1361 }
1362 module_exit(usbatm_usb_exit);
1363
1364 MODULE_AUTHOR(DRIVER_AUTHOR);
1365 MODULE_DESCRIPTION(DRIVER_DESC);
1366 MODULE_LICENSE("GPL");
1367 MODULE_VERSION(DRIVER_VERSION);
1368
1369 /************
1370 **  debug  **
1371 ************/
1372
1373 #ifdef VERBOSE_DEBUG
1374 static int usbatm_print_packet(const unsigned char *data, int len)
1375 {
1376         unsigned char buffer[256];
1377         int i = 0, j = 0;
1378
1379         for (i = 0; i < len;) {
1380                 buffer[0] = '\0';
1381                 sprintf(buffer, "%.3d :", i);
1382                 for (j = 0; (j < 16) && (i < len); j++, i++)
1383                         sprintf(buffer, "%s %2.2x", buffer, data[i]);
1384                 dbg("%s", buffer);
1385         }
1386         return i;
1387 }
1388 #endif