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Linux-2.6.12-rc2
[linux-2.6/next.git] / drivers / usb / atm / usb_atm.c
bloba4cd4476d49aaa009e6da2ef26902a689a987162
1 /******************************************************************************
2 * usb_atm.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
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, maintained by Duncan Sands (duncan.sands@free.fr)
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 * udsl_usb_send_data_context->urb to a pointer and adding code
45 * to alloc and free it
46 * - remove_wait_queue() added to udsl_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 udsl_usb_send_data()
61 * 1.1: - Turned off packet debugging
62 *
63 */
64
65 #include <linux/module.h>
66 #include <linux/moduleparam.h>
67 #include <linux/kernel.h>
68 #include <linux/sched.h>
69 #include <linux/timer.h>
70 #include <linux/errno.h>
71 #include <linux/proc_fs.h>
72 #include <linux/slab.h>
73 #include <linux/wait.h>
74 #include <linux/list.h>
75 #include <asm/uaccess.h>
76 #include <linux/smp_lock.h>
77 #include <linux/interrupt.h>
78 #include <linux/atm.h>
79 #include <linux/atmdev.h>
80 #include <linux/crc32.h>
81 #include <linux/init.h>
82 #include <linux/firmware.h>
83
84 #include "usb_atm.h"
85
86 #ifdef VERBOSE_DEBUG
87 static int udsl_print_packet(const unsigned char *data, int len);
88 #define PACKETDEBUG(arg...) udsl_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 "1.8"
97 #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
98
99 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
100 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
101 static unsigned int num_rcv_bufs = UDSL_DEFAULT_RCV_BUFS;
102 static unsigned int num_snd_bufs = UDSL_DEFAULT_SND_BUFS;
103 static unsigned int rcv_buf_size = UDSL_DEFAULT_RCV_BUF_SIZE;
104 static unsigned int snd_buf_size = UDSL_DEFAULT_SND_BUF_SIZE;
105
106 module_param(num_rcv_urbs, uint, 0444);
107 MODULE_PARM_DESC(num_rcv_urbs,
108 "Number of urbs used for reception (range: 0-"
109 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
110 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
111
112 module_param(num_snd_urbs, uint, 0444);
113 MODULE_PARM_DESC(num_snd_urbs,
114 "Number of urbs used for transmission (range: 0-"
115 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
116 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
117
118 module_param(num_rcv_bufs, uint, 0444);
119 MODULE_PARM_DESC(num_rcv_bufs,
120 "Number of buffers used for reception (range: 0-"
121 __MODULE_STRING(UDSL_MAX_RCV_BUFS) ", default: "
122 __MODULE_STRING(UDSL_DEFAULT_RCV_BUFS) ")");
123
124 module_param(num_snd_bufs, uint, 0444);
125 MODULE_PARM_DESC(num_snd_bufs,
126 "Number of buffers used for transmission (range: 0-"
127 __MODULE_STRING(UDSL_MAX_SND_BUFS) ", default: "
128 __MODULE_STRING(UDSL_DEFAULT_SND_BUFS) ")");
129
130 module_param(rcv_buf_size, uint, 0444);
131 MODULE_PARM_DESC(rcv_buf_size,
132 "Size of the buffers used for reception (range: 0-"
133 __MODULE_STRING(UDSL_MAX_RCV_BUF_SIZE) ", default: "
134 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
135
136 module_param(snd_buf_size, uint, 0444);
137 MODULE_PARM_DESC(snd_buf_size,
138 "Size of the buffers used for transmission (range: 0-"
139 __MODULE_STRING(UDSL_MAX_SND_BUF_SIZE) ", default: "
140 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
141
142 /* ATM */
143
144 static void udsl_atm_dev_close(struct atm_dev *dev);
145 static int udsl_atm_open(struct atm_vcc *vcc);
146 static void udsl_atm_close(struct atm_vcc *vcc);
147 static int udsl_atm_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg);
148 static int udsl_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
149 static int udsl_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
150
151 static struct atmdev_ops udsl_atm_devops = {
152 .dev_close = udsl_atm_dev_close,
153 .open = udsl_atm_open,
154 .close = udsl_atm_close,
155 .ioctl = udsl_atm_ioctl,
156 .send = udsl_atm_send,
157 .proc_read = udsl_atm_proc_read,
158 .owner = THIS_MODULE,
159 };
160
161 /***********
162 ** misc **
163 ***********/
164
165 static inline void udsl_pop(struct atm_vcc *vcc, struct sk_buff *skb)
166 {
167 if (vcc->pop)
168 vcc->pop(vcc, skb);
169 else
170 dev_kfree_skb(skb);
171 }
172
173 /*************
174 ** decode **
175 *************/
176
177 static inline struct udsl_vcc_data *udsl_find_vcc(struct udsl_instance_data *instance,
178 short vpi, int vci)
179 {
180 struct udsl_vcc_data *vcc;
181
182 list_for_each_entry(vcc, &instance->vcc_list, list)
183 if ((vcc->vci == vci) && (vcc->vpi == vpi))
184 return vcc;
185 return NULL;
186 }
187
188 static void udsl_extract_cells(struct udsl_instance_data *instance,
189 unsigned char *source, unsigned int howmany)
190 {
191 struct udsl_vcc_data *cached_vcc = NULL;
192 struct atm_vcc *vcc;
193 struct sk_buff *sarb;
194 struct udsl_vcc_data *vcc_data;
195 int cached_vci = 0;
196 unsigned int i;
197 int pti;
198 int vci;
199 short cached_vpi = 0;
200 short vpi;
201
202 for (i = 0; i < howmany;
203 i++, source += ATM_CELL_SIZE + instance->rcv_padding) {
204 vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
205 vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
206 pti = (source[3] & 0x2) != 0;
207
208 vdbg("udsl_extract_cells: vpi %hd, vci %d, pti %d", vpi, vci, pti);
209
210 if (cached_vcc && (vci == cached_vci) && (vpi == cached_vpi))
211 vcc_data = cached_vcc;
212 else if ((vcc_data = udsl_find_vcc(instance, vpi, vci))) {
213 cached_vcc = vcc_data;
214 cached_vpi = vpi;
215 cached_vci = vci;
216 } else {
217 dbg("udsl_extract_cells: unknown vpi/vci (%hd/%d)!", vpi, vci);
218 continue;
219 }
220
221 vcc = vcc_data->vcc;
222 sarb = vcc_data->sarb;
223
224 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
225 dbg("udsl_extract_cells: buffer overrun (sarb->len %u, vcc: 0x%p)!", sarb->len, vcc);
226 /* discard cells already received */
227 skb_trim(sarb, 0);
228 }
229
230 memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
231 __skb_put(sarb, ATM_CELL_PAYLOAD);
232
233 if (pti) {
234 struct sk_buff *skb;
235 unsigned int length;
236 unsigned int pdu_length;
237
238 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
239
240 /* guard against overflow */
241 if (length > ATM_MAX_AAL5_PDU) {
242 dbg("udsl_extract_cells: bogus length %u (vcc: 0x%p)!", length, vcc);
243 atomic_inc(&vcc->stats->rx_err);
244 goto out;
245 }
246
247 pdu_length = UDSL_NUM_CELLS(length) * ATM_CELL_PAYLOAD;
248
249 if (sarb->len < pdu_length) {
250 dbg("udsl_extract_cells: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!", pdu_length, sarb->len, vcc);
251 atomic_inc(&vcc->stats->rx_err);
252 goto out;
253 }
254
255 if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) {
256 dbg("udsl_extract_cells: packet failed crc check (vcc: 0x%p)!", vcc);
257 atomic_inc(&vcc->stats->rx_err);
258 goto out;
259 }
260
261 vdbg("udsl_extract_cells: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", length, pdu_length, vcc);
262
263 if (!(skb = dev_alloc_skb(length))) {
264 dbg("udsl_extract_cells: no memory for skb (length: %u)!", length);
265 atomic_inc(&vcc->stats->rx_drop);
266 goto out;
267 }
268
269 vdbg("udsl_extract_cells: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", skb, skb->truesize);
270
271 if (!atm_charge(vcc, skb->truesize)) {
272 dbg("udsl_extract_cells: failed atm_charge (skb->truesize: %u)!", skb->truesize);
273 dev_kfree_skb(skb);
274 goto out; /* atm_charge increments rx_drop */
275 }
276
277 memcpy(skb->data, sarb->tail - pdu_length, length);
278 __skb_put(skb, length);
279
280 vdbg("udsl_extract_cells: sending skb 0x%p, skb->len %u, skb->truesize %u", skb, skb->len, skb->truesize);
281
282 PACKETDEBUG(skb->data, skb->len);
283
284 vcc->push(vcc, skb);
285
286 atomic_inc(&vcc->stats->rx);
287 out:
288 skb_trim(sarb, 0);
289 }
290 }
291 }
292
293 /*************
294 ** encode **
295 *************/
296
297 static inline void udsl_fill_cell_header(unsigned char *target, struct atm_vcc *vcc)
298 {
299 target[0] = vcc->vpi >> 4;
300 target[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
301 target[2] = vcc->vci >> 4;
302 target[3] = vcc->vci << 4;
303 target[4] = 0xec;
304 }
305
306 static const unsigned char zeros[ATM_CELL_PAYLOAD];
307
308 static void udsl_groom_skb(struct atm_vcc *vcc, struct sk_buff *skb)
309 {
310 struct udsl_control *ctrl = UDSL_SKB(skb);
311 unsigned int zero_padding;
312 u32 crc;
313
314 ctrl->atm_data.vcc = vcc;
315
316 ctrl->num_cells = UDSL_NUM_CELLS(skb->len);
317 ctrl->num_entire = skb->len / ATM_CELL_PAYLOAD;
318
319 zero_padding = ctrl->num_cells * ATM_CELL_PAYLOAD - skb->len - ATM_AAL5_TRAILER;
320
321 if (ctrl->num_entire + 1 < ctrl->num_cells)
322 ctrl->pdu_padding = zero_padding - (ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER);
323 else
324 ctrl->pdu_padding = zero_padding;
325
326 ctrl->aal5_trailer[0] = 0; /* UU = 0 */
327 ctrl->aal5_trailer[1] = 0; /* CPI = 0 */
328 ctrl->aal5_trailer[2] = skb->len >> 8;
329 ctrl->aal5_trailer[3] = skb->len;
330
331 crc = crc32_be(~0, skb->data, skb->len);
332 crc = crc32_be(crc, zeros, zero_padding);
333 crc = crc32_be(crc, ctrl->aal5_trailer, 4);
334 crc = ~crc;
335
336 ctrl->aal5_trailer[4] = crc >> 24;
337 ctrl->aal5_trailer[5] = crc >> 16;
338 ctrl->aal5_trailer[6] = crc >> 8;
339 ctrl->aal5_trailer[7] = crc;
340 }
341
342 static unsigned int udsl_write_cells(struct udsl_instance_data *instance,
343 unsigned int howmany, struct sk_buff *skb,
344 unsigned char **target_p)
345 {
346 struct udsl_control *ctrl = UDSL_SKB(skb);
347 unsigned char *target = *target_p;
348 unsigned int nc, ne, i;
349
350 vdbg("udsl_write_cells: howmany=%u, skb->len=%d, num_cells=%u, num_entire=%u, pdu_padding=%u", howmany, skb->len, ctrl->num_cells, ctrl->num_entire, ctrl->pdu_padding);
351
352 nc = ctrl->num_cells;
353 ne = min(howmany, ctrl->num_entire);
354
355 for (i = 0; i < ne; i++) {
356 udsl_fill_cell_header(target, ctrl->atm_data.vcc);
357 target += ATM_CELL_HEADER;
358 memcpy(target, skb->data, ATM_CELL_PAYLOAD);
359 target += ATM_CELL_PAYLOAD;
360 if (instance->snd_padding) {
361 memset(target, 0, instance->snd_padding);
362 target += instance->snd_padding;
363 }
364 __skb_pull(skb, ATM_CELL_PAYLOAD);
365 }
366
367 ctrl->num_entire -= ne;
368
369 if (!(ctrl->num_cells -= ne) || !(howmany -= ne))
370 goto out;
371
372 udsl_fill_cell_header(target, ctrl->atm_data.vcc);
373 target += ATM_CELL_HEADER;
374 memcpy(target, skb->data, skb->len);
375 target += skb->len;
376 __skb_pull(skb, skb->len);
377 memset(target, 0, ctrl->pdu_padding);
378 target += ctrl->pdu_padding;
379
380 if (--ctrl->num_cells) {
381 if (!--howmany) {
382 ctrl->pdu_padding = ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER;
383 goto out;
384 }
385
386 if (instance->snd_padding) {
387 memset(target, 0, instance->snd_padding);
388 target += instance->snd_padding;
389 }
390 udsl_fill_cell_header(target, ctrl->atm_data.vcc);
391 target += ATM_CELL_HEADER;
392 memset(target, 0, ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER);
393 target += ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER;
394
395 --ctrl->num_cells;
396 UDSL_ASSERT(!ctrl->num_cells);
397 }
398
399 memcpy(target, ctrl->aal5_trailer, ATM_AAL5_TRAILER);
400 target += ATM_AAL5_TRAILER;
401 /* set pti bit in last cell */
402 *(target + 3 - ATM_CELL_SIZE) |= 0x2;
403 if (instance->snd_padding) {
404 memset(target, 0, instance->snd_padding);
405 target += instance->snd_padding;
406 }
407 out:
408 *target_p = target;
409 return nc - ctrl->num_cells;
410 }
411
412 /**************
413 ** receive **
414 **************/
415
416 static void udsl_complete_receive(struct urb *urb, struct pt_regs *regs)
417 {
418 struct udsl_receive_buffer *buf;
419 struct udsl_instance_data *instance;
420 struct udsl_receiver *rcv;
421 unsigned long flags;
422
423 if (!urb || !(rcv = urb->context)) {
424 dbg("udsl_complete_receive: bad urb!");
425 return;
426 }
427
428 instance = rcv->instance;
429 buf = rcv->buffer;
430
431 buf->filled_cells = urb->actual_length / (ATM_CELL_SIZE + instance->rcv_padding);
432
433 vdbg("udsl_complete_receive: urb 0x%p, status %d, actual_length %d, filled_cells %u, rcv 0x%p, buf 0x%p", urb, urb->status, urb->actual_length, buf->filled_cells, rcv, buf);
434
435 UDSL_ASSERT(buf->filled_cells <= rcv_buf_size);
436
437 /* may not be in_interrupt() */
438 spin_lock_irqsave(&instance->receive_lock, flags);
439 list_add(&rcv->list, &instance->spare_receivers);
440 list_add_tail(&buf->list, &instance->filled_receive_buffers);
441 if (likely(!urb->status))
442 tasklet_schedule(&instance->receive_tasklet);
443 spin_unlock_irqrestore(&instance->receive_lock, flags);
444 }
445
446 static void udsl_process_receive(unsigned long data)
447 {
448 struct udsl_receive_buffer *buf;
449 struct udsl_instance_data *instance = (struct udsl_instance_data *)data;
450 struct udsl_receiver *rcv;
451 int err;
452
453 made_progress:
454 while (!list_empty(&instance->spare_receive_buffers)) {
455 spin_lock_irq(&instance->receive_lock);
456 if (list_empty(&instance->spare_receivers)) {
457 spin_unlock_irq(&instance->receive_lock);
458 break;
459 }
460 rcv = list_entry(instance->spare_receivers.next,
461 struct udsl_receiver, list);
462 list_del(&rcv->list);
463 spin_unlock_irq(&instance->receive_lock);
464
465 buf = list_entry(instance->spare_receive_buffers.next,
466 struct udsl_receive_buffer, list);
467 list_del(&buf->list);
468
469 rcv->buffer = buf;
470
471 usb_fill_bulk_urb(rcv->urb, instance->usb_dev,
472 usb_rcvbulkpipe(instance->usb_dev, instance->data_endpoint),
473 buf->base,
474 rcv_buf_size * (ATM_CELL_SIZE + instance->rcv_padding),
475 udsl_complete_receive, rcv);
476
477 vdbg("udsl_process_receive: sending urb 0x%p, rcv 0x%p, buf 0x%p",
478 rcv->urb, rcv, buf);
479
480 if ((err = usb_submit_urb(rcv->urb, GFP_ATOMIC)) < 0) {
481 dbg("udsl_process_receive: urb submission failed (%d)!", err);
482 list_add(&buf->list, &instance->spare_receive_buffers);
483 spin_lock_irq(&instance->receive_lock);
484 list_add(&rcv->list, &instance->spare_receivers);
485 spin_unlock_irq(&instance->receive_lock);
486 break;
487 }
488 }
489
490 spin_lock_irq(&instance->receive_lock);
491 if (list_empty(&instance->filled_receive_buffers)) {
492 spin_unlock_irq(&instance->receive_lock);
493 return; /* done - no more buffers */
494 }
495 buf = list_entry(instance->filled_receive_buffers.next,
496 struct udsl_receive_buffer, list);
497 list_del(&buf->list);
498 spin_unlock_irq(&instance->receive_lock);
499
500 vdbg("udsl_process_receive: processing buf 0x%p", buf);
501 udsl_extract_cells(instance, buf->base, buf->filled_cells);
502 list_add(&buf->list, &instance->spare_receive_buffers);
503 goto made_progress;
504 }
505
506 /***********
507 ** send **
508 ***********/
509
510 static void udsl_complete_send(struct urb *urb, struct pt_regs *regs)
511 {
512 struct udsl_instance_data *instance;
513 struct udsl_sender *snd;
514 unsigned long flags;
515
516 if (!urb || !(snd = urb->context) || !(instance = snd->instance)) {
517 dbg("udsl_complete_send: bad urb!");
518 return;
519 }
520
521 vdbg("udsl_complete_send: urb 0x%p, status %d, snd 0x%p, buf 0x%p", urb,
522 urb->status, snd, snd->buffer);
523
524 /* may not be in_interrupt() */
525 spin_lock_irqsave(&instance->send_lock, flags);
526 list_add(&snd->list, &instance->spare_senders);
527 list_add(&snd->buffer->list, &instance->spare_send_buffers);
528 tasklet_schedule(&instance->send_tasklet);
529 spin_unlock_irqrestore(&instance->send_lock, flags);
530 }
531
532 static void udsl_process_send(unsigned long data)
533 {
534 struct udsl_send_buffer *buf;
535 struct udsl_instance_data *instance = (struct udsl_instance_data *)data;
536 struct sk_buff *skb;
537 struct udsl_sender *snd;
538 int err;
539 unsigned int num_written;
540
541 made_progress:
542 spin_lock_irq(&instance->send_lock);
543 while (!list_empty(&instance->spare_senders)) {
544 if (!list_empty(&instance->filled_send_buffers)) {
545 buf = list_entry(instance->filled_send_buffers.next,
546 struct udsl_send_buffer, list);
547 list_del(&buf->list);
548 } else if ((buf = instance->current_buffer)) {
549 instance->current_buffer = NULL;
550 } else /* all buffers empty */
551 break;
552
553 snd = list_entry(instance->spare_senders.next,
554 struct udsl_sender, list);
555 list_del(&snd->list);
556 spin_unlock_irq(&instance->send_lock);
557
558 snd->buffer = buf;
559 usb_fill_bulk_urb(snd->urb, instance->usb_dev,
560 usb_sndbulkpipe(instance->usb_dev, instance->data_endpoint),
561 buf->base,
562 (snd_buf_size - buf->free_cells) * (ATM_CELL_SIZE + instance->snd_padding),
563 udsl_complete_send, snd);
564
565 vdbg("udsl_process_send: submitting urb 0x%p (%d cells), snd 0x%p, buf 0x%p",
566 snd->urb, snd_buf_size - buf->free_cells, snd, buf);
567
568 if ((err = usb_submit_urb(snd->urb, GFP_ATOMIC)) < 0) {
569 dbg("udsl_process_send: urb submission failed (%d)!", err);
570 spin_lock_irq(&instance->send_lock);
571 list_add(&snd->list, &instance->spare_senders);
572 spin_unlock_irq(&instance->send_lock);
573 list_add(&buf->list, &instance->filled_send_buffers);
574 return; /* bail out */
575 }
576
577 spin_lock_irq(&instance->send_lock);
578 } /* while */
579 spin_unlock_irq(&instance->send_lock);
580
581 if (!instance->current_skb)
582 instance->current_skb = skb_dequeue(&instance->sndqueue);
583 if (!instance->current_skb)
584 return; /* done - no more skbs */
585
586 skb = instance->current_skb;
587
588 if (!(buf = instance->current_buffer)) {
589 spin_lock_irq(&instance->send_lock);
590 if (list_empty(&instance->spare_send_buffers)) {
591 instance->current_buffer = NULL;
592 spin_unlock_irq(&instance->send_lock);
593 return; /* done - no more buffers */
594 }
595 buf = list_entry(instance->spare_send_buffers.next,
596 struct udsl_send_buffer, list);
597 list_del(&buf->list);
598 spin_unlock_irq(&instance->send_lock);
599
600 buf->free_start = buf->base;
601 buf->free_cells = snd_buf_size;
602
603 instance->current_buffer = buf;
604 }
605
606 num_written = udsl_write_cells(instance, buf->free_cells, skb, &buf->free_start);
607
608 vdbg("udsl_process_send: wrote %u cells from skb 0x%p to buffer 0x%p",
609 num_written, skb, buf);
610
611 if (!(buf->free_cells -= num_written)) {
612 list_add_tail(&buf->list, &instance->filled_send_buffers);
613 instance->current_buffer = NULL;
614 }
615
616 vdbg("udsl_process_send: buffer contains %d cells, %d left",
617 snd_buf_size - buf->free_cells, buf->free_cells);
618
619 if (!UDSL_SKB(skb)->num_cells) {
620 struct atm_vcc *vcc = UDSL_SKB(skb)->atm_data.vcc;
621
622 udsl_pop(vcc, skb);
623 instance->current_skb = NULL;
624
625 atomic_inc(&vcc->stats->tx);
626 }
627
628 goto made_progress;
629 }
630
631 static void udsl_cancel_send(struct udsl_instance_data *instance,
632 struct atm_vcc *vcc)
633 {
634 struct sk_buff *skb, *n;
635
636 dbg("udsl_cancel_send entered");
637 spin_lock_irq(&instance->sndqueue.lock);
638 for (skb = instance->sndqueue.next, n = skb->next;
639 skb != (struct sk_buff *)&instance->sndqueue;
640 skb = n, n = skb->next)
641 if (UDSL_SKB(skb)->atm_data.vcc == vcc) {
642 dbg("udsl_cancel_send: popping skb 0x%p", skb);
643 __skb_unlink(skb, &instance->sndqueue);
644 udsl_pop(vcc, skb);
645 }
646 spin_unlock_irq(&instance->sndqueue.lock);
647
648 tasklet_disable(&instance->send_tasklet);
649 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm_data.vcc == vcc)) {
650 dbg("udsl_cancel_send: popping current skb (0x%p)", skb);
651 instance->current_skb = NULL;
652 udsl_pop(vcc, skb);
653 }
654 tasklet_enable(&instance->send_tasklet);
655 dbg("udsl_cancel_send done");
656 }
657
658 static int udsl_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
659 {
660 struct udsl_instance_data *instance = vcc->dev->dev_data;
661 int err;
662
663 vdbg("udsl_atm_send called (skb 0x%p, len %u)", skb, skb->len);
664
665 if (!instance) {
666 dbg("udsl_atm_send: NULL data!");
667 err = -ENODEV;
668 goto fail;
669 }
670
671 if (vcc->qos.aal != ATM_AAL5) {
672 dbg("udsl_atm_send: unsupported ATM type %d!", vcc->qos.aal);
673 err = -EINVAL;
674 goto fail;
675 }
676
677 if (skb->len > ATM_MAX_AAL5_PDU) {
678 dbg("udsl_atm_send: packet too long (%d vs %d)!", skb->len,
679 ATM_MAX_AAL5_PDU);
680 err = -EINVAL;
681 goto fail;
682 }
683
684 PACKETDEBUG(skb->data, skb->len);
685
686 udsl_groom_skb(vcc, skb);
687 skb_queue_tail(&instance->sndqueue, skb);
688 tasklet_schedule(&instance->send_tasklet);
689
690 return 0;
691
692 fail:
693 udsl_pop(vcc, skb);
694 return err;
695 }
696
697 /********************
698 ** bean counting **
699 ********************/
700
701 static void udsl_destroy_instance(struct kref *kref)
702 {
703 struct udsl_instance_data *instance =
704 container_of(kref, struct udsl_instance_data, refcount);
705
706 tasklet_kill(&instance->receive_tasklet);
707 tasklet_kill(&instance->send_tasklet);
708 usb_put_dev(instance->usb_dev);
709 kfree(instance);
710 }
711
712 void udsl_get_instance(struct udsl_instance_data *instance)
713 {
714 kref_get(&instance->refcount);
715 }
716
717 void udsl_put_instance(struct udsl_instance_data *instance)
718 {
719 kref_put(&instance->refcount, udsl_destroy_instance);
720 }
721
722 /**********
723 ** ATM **
724 **********/
725
726 static void udsl_atm_dev_close(struct atm_dev *dev)
727 {
728 struct udsl_instance_data *instance = dev->dev_data;
729
730 dev->dev_data = NULL;
731 udsl_put_instance(instance);
732 }
733
734 static int udsl_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
735 {
736 struct udsl_instance_data *instance = atm_dev->dev_data;
737 int left = *pos;
738
739 if (!instance) {
740 dbg("udsl_atm_proc_read: NULL instance!");
741 return -ENODEV;
742 }
743
744 if (!left--)
745 return sprintf(page, "%s\n", instance->description);
746
747 if (!left--)
748 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
749 atm_dev->esi[0], atm_dev->esi[1],
750 atm_dev->esi[2], atm_dev->esi[3],
751 atm_dev->esi[4], atm_dev->esi[5]);
752
753 if (!left--)
754 return sprintf(page,
755 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
756 atomic_read(&atm_dev->stats.aal5.tx),
757 atomic_read(&atm_dev->stats.aal5.tx_err),
758 atomic_read(&atm_dev->stats.aal5.rx),
759 atomic_read(&atm_dev->stats.aal5.rx_err),
760 atomic_read(&atm_dev->stats.aal5.rx_drop));
761
762 if (!left--) {
763 switch (atm_dev->signal) {
764 case ATM_PHY_SIG_FOUND:
765 sprintf(page, "Line up");
766 break;
767 case ATM_PHY_SIG_LOST:
768 sprintf(page, "Line down");
769 break;
770 default:
771 sprintf(page, "Line state unknown");
772 break;
773 }
774
775 if (instance->usb_dev->state == USB_STATE_NOTATTACHED)
776 strcat(page, ", disconnected\n");
777 else {
778 if (instance->status == UDSL_LOADED_FIRMWARE)
779 strcat(page, ", firmware loaded\n");
780 else if (instance->status == UDSL_LOADING_FIRMWARE)
781 strcat(page, ", firmware loading\n");
782 else
783 strcat(page, ", no firmware\n");
784 }
785
786 return strlen(page);
787 }
788
789 return 0;
790 }
791
792 static int udsl_atm_open(struct atm_vcc *vcc)
793 {
794 struct udsl_instance_data *instance = vcc->dev->dev_data;
795 struct udsl_vcc_data *new;
796 unsigned int max_pdu;
797 int vci = vcc->vci;
798 short vpi = vcc->vpi;
799 int err;
800
801 dbg("udsl_atm_open: vpi %hd, vci %d", vpi, vci);
802
803 if (!instance) {
804 dbg("udsl_atm_open: NULL data!");
805 return -ENODEV;
806 }
807
808 /* only support AAL5 */
809 if ((vcc->qos.aal != ATM_AAL5) || (vcc->qos.rxtp.max_sdu < 0)
810 || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
811 dbg("udsl_atm_open: unsupported ATM type %d!", vcc->qos.aal);
812 return -EINVAL;
813 }
814
815 if (instance->firmware_wait &&
816 (err = instance->firmware_wait(instance)) < 0) {
817 dbg("udsl_atm_open: firmware not loaded (%d)!", err);
818 return err;
819 }
820
821 down(&instance->serialize); /* vs self, udsl_atm_close */
822
823 if (udsl_find_vcc(instance, vpi, vci)) {
824 dbg("udsl_atm_open: %hd/%d already in use!", vpi, vci);
825 up(&instance->serialize);
826 return -EADDRINUSE;
827 }
828
829 if (!(new = kmalloc(sizeof(struct udsl_vcc_data), GFP_KERNEL))) {
830 dbg("udsl_atm_open: no memory for vcc_data!");
831 up(&instance->serialize);
832 return -ENOMEM;
833 }
834
835 memset(new, 0, sizeof(struct udsl_vcc_data));
836 new->vcc = vcc;
837 new->vpi = vpi;
838 new->vci = vci;
839
840 /* udsl_extract_cells requires at least one cell */
841 max_pdu = max(1, UDSL_NUM_CELLS(vcc->qos.rxtp.max_sdu)) * ATM_CELL_PAYLOAD;
842 if (!(new->sarb = alloc_skb(max_pdu, GFP_KERNEL))) {
843 dbg("udsl_atm_open: no memory for SAR buffer!");
844 kfree(new);
845 up(&instance->serialize);
846 return -ENOMEM;
847 }
848
849 vcc->dev_data = new;
850
851 tasklet_disable(&instance->receive_tasklet);
852 list_add(&new->list, &instance->vcc_list);
853 tasklet_enable(&instance->receive_tasklet);
854
855 set_bit(ATM_VF_ADDR, &vcc->flags);
856 set_bit(ATM_VF_PARTIAL, &vcc->flags);
857 set_bit(ATM_VF_READY, &vcc->flags);
858
859 up(&instance->serialize);
860
861 tasklet_schedule(&instance->receive_tasklet);
862
863 dbg("udsl_atm_open: allocated vcc data 0x%p (max_pdu: %u)", new, max_pdu);
864
865 return 0;
866 }
867
868 static void udsl_atm_close(struct atm_vcc *vcc)
869 {
870 struct udsl_instance_data *instance = vcc->dev->dev_data;
871 struct udsl_vcc_data *vcc_data = vcc->dev_data;
872
873 dbg("udsl_atm_close called");
874
875 if (!instance || !vcc_data) {
876 dbg("udsl_atm_close: NULL data!");
877 return;
878 }
879
880 dbg("udsl_atm_close: deallocating vcc 0x%p with vpi %d vci %d",
881 vcc_data, vcc_data->vpi, vcc_data->vci);
882
883 udsl_cancel_send(instance, vcc);
884
885 down(&instance->serialize); /* vs self, udsl_atm_open */
886
887 tasklet_disable(&instance->receive_tasklet);
888 list_del(&vcc_data->list);
889 tasklet_enable(&instance->receive_tasklet);
890
891 kfree_skb(vcc_data->sarb);
892 vcc_data->sarb = NULL;
893
894 kfree(vcc_data);
895 vcc->dev_data = NULL;
896
897 vcc->vpi = ATM_VPI_UNSPEC;
898 vcc->vci = ATM_VCI_UNSPEC;
899 clear_bit(ATM_VF_READY, &vcc->flags);
900 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
901 clear_bit(ATM_VF_ADDR, &vcc->flags);
902
903 up(&instance->serialize);
904
905 dbg("udsl_atm_close successful");
906 }
907
908 static int udsl_atm_ioctl(struct atm_dev *dev, unsigned int cmd,
909 void __user * arg)
910 {
911 switch (cmd) {
912 case ATM_QUERYLOOP:
913 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
914 default:
915 return -ENOIOCTLCMD;
916 }
917 }
918
919 /**********
920 ** USB **
921 **********/
922
923 int udsl_instance_setup(struct usb_device *dev,
924 struct udsl_instance_data *instance)
925 {
926 char *buf;
927 int i, length;
928
929 kref_init(&instance->refcount); /* one for USB */
930 udsl_get_instance(instance); /* one for ATM */
931
932 init_MUTEX(&instance->serialize);
933
934 instance->usb_dev = dev;
935
936 INIT_LIST_HEAD(&instance->vcc_list);
937
938 instance->status = UDSL_NO_FIRMWARE;
939 init_waitqueue_head(&instance->firmware_waiters);
940
941 spin_lock_init(&instance->receive_lock);
942 INIT_LIST_HEAD(&instance->spare_receivers);
943 INIT_LIST_HEAD(&instance->filled_receive_buffers);
944
945 tasklet_init(&instance->receive_tasklet, udsl_process_receive, (unsigned long)instance);
946 INIT_LIST_HEAD(&instance->spare_receive_buffers);
947
948 skb_queue_head_init(&instance->sndqueue);
949
950 spin_lock_init(&instance->send_lock);
951 INIT_LIST_HEAD(&instance->spare_senders);
952 INIT_LIST_HEAD(&instance->spare_send_buffers);
953
954 tasklet_init(&instance->send_tasklet, udsl_process_send,
955 (unsigned long)instance);
956 INIT_LIST_HEAD(&instance->filled_send_buffers);
957
958 /* receive init */
959 for (i = 0; i < num_rcv_urbs; i++) {
960 struct udsl_receiver *rcv = &(instance->receivers[i]);
961
962 if (!(rcv->urb = usb_alloc_urb(0, GFP_KERNEL))) {
963 dbg("udsl_usb_probe: no memory for receive urb %d!", i);
964 goto fail;
965 }
966
967 rcv->instance = instance;
968
969 list_add(&rcv->list, &instance->spare_receivers);
970 }
971
972 for (i = 0; i < num_rcv_bufs; i++) {
973 struct udsl_receive_buffer *buf =
974 &(instance->receive_buffers[i]);
975
976 buf->base = kmalloc(rcv_buf_size * (ATM_CELL_SIZE + instance->rcv_padding),
977 GFP_KERNEL);
978 if (!buf->base) {
979 dbg("udsl_usb_probe: no memory for receive buffer %d!", i);
980 goto fail;
981 }
982
983 list_add(&buf->list, &instance->spare_receive_buffers);
984 }
985
986 /* send init */
987 for (i = 0; i < num_snd_urbs; i++) {
988 struct udsl_sender *snd = &(instance->senders[i]);
989
990 if (!(snd->urb = usb_alloc_urb(0, GFP_KERNEL))) {
991 dbg("udsl_usb_probe: no memory for send urb %d!", i);
992 goto fail;
993 }
994
995 snd->instance = instance;
996
997 list_add(&snd->list, &instance->spare_senders);
998 }
999
1000 for (i = 0; i < num_snd_bufs; i++) {
1001 struct udsl_send_buffer *buf = &(instance->send_buffers[i]);
1002
1003 buf->base = kmalloc(snd_buf_size * (ATM_CELL_SIZE + instance->snd_padding),
1004 GFP_KERNEL);
1005 if (!buf->base) {
1006 dbg("udsl_usb_probe: no memory for send buffer %d!", i);
1007 goto fail;
1008 }
1009
1010 list_add(&buf->list, &instance->spare_send_buffers);
1011 }
1012
1013 /* ATM init */
1014 instance->atm_dev = atm_dev_register(instance->driver_name,
1015 &udsl_atm_devops, -1, NULL);
1016 if (!instance->atm_dev) {
1017 dbg("udsl_usb_probe: failed to register ATM device!");
1018 goto fail;
1019 }
1020
1021 instance->atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
1022 instance->atm_dev->ci_range.vci_bits = ATM_CI_MAX;
1023 instance->atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
1024
1025 /* temp init ATM device, set to 128kbit */
1026 instance->atm_dev->link_rate = 128 * 1000 / 424;
1027
1028 /* device description */
1029 buf = instance->description;
1030 length = sizeof(instance->description);
1031
1032 if ((i = usb_string(dev, dev->descriptor.iProduct, buf, length)) < 0)
1033 goto finish;
1034
1035 buf += i;
1036 length -= i;
1037
1038 i = scnprintf(buf, length, " (");
1039 buf += i;
1040 length -= i;
1041
1042 if (length <= 0 || (i = usb_make_path(dev, buf, length)) < 0)
1043 goto finish;
1044
1045 buf += i;
1046 length -= i;
1047
1048 snprintf(buf, length, ")");
1049
1050 finish:
1051 /* ready for ATM callbacks */
1052 wmb();
1053 instance->atm_dev->dev_data = instance;
1054
1055 usb_get_dev(dev);
1056
1057 return 0;
1058
1059 fail:
1060 for (i = 0; i < num_snd_bufs; i++)
1061 kfree(instance->send_buffers[i].base);
1062
1063 for (i = 0; i < num_snd_urbs; i++)
1064 usb_free_urb(instance->senders[i].urb);
1065
1066 for (i = 0; i < num_rcv_bufs; i++)
1067 kfree(instance->receive_buffers[i].base);
1068
1069 for (i = 0; i < num_rcv_urbs; i++)
1070 usb_free_urb(instance->receivers[i].urb);
1071
1072 return -ENOMEM;
1073 }
1074
1075 void udsl_instance_disconnect(struct udsl_instance_data *instance)
1076 {
1077 int i;
1078
1079 dbg("udsl_instance_disconnect entered");
1080
1081 if (!instance) {
1082 dbg("udsl_instance_disconnect: NULL instance!");
1083 return;
1084 }
1085
1086 /* receive finalize */
1087 tasklet_disable(&instance->receive_tasklet);
1088
1089 for (i = 0; i < num_rcv_urbs; i++)
1090 usb_kill_urb(instance->receivers[i].urb);
1091
1092 /* no need to take the spinlock */
1093 INIT_LIST_HEAD(&instance->filled_receive_buffers);
1094 INIT_LIST_HEAD(&instance->spare_receive_buffers);
1095
1096 tasklet_enable(&instance->receive_tasklet);
1097
1098 for (i = 0; i < num_rcv_urbs; i++)
1099 usb_free_urb(instance->receivers[i].urb);
1100
1101 for (i = 0; i < num_rcv_bufs; i++)
1102 kfree(instance->receive_buffers[i].base);
1103
1104 /* send finalize */
1105 tasklet_disable(&instance->send_tasklet);
1106
1107 for (i = 0; i < num_snd_urbs; i++)
1108 usb_kill_urb(instance->senders[i].urb);
1109
1110 /* no need to take the spinlock */
1111 INIT_LIST_HEAD(&instance->spare_senders);
1112 INIT_LIST_HEAD(&instance->spare_send_buffers);
1113 instance->current_buffer = NULL;
1114
1115 tasklet_enable(&instance->send_tasklet);
1116
1117 for (i = 0; i < num_snd_urbs; i++)
1118 usb_free_urb(instance->senders[i].urb);
1119
1120 for (i = 0; i < num_snd_bufs; i++)
1121 kfree(instance->send_buffers[i].base);
1122
1123 /* ATM finalize */
1124 shutdown_atm_dev(instance->atm_dev);
1125 }
1126
1127 EXPORT_SYMBOL_GPL(udsl_get_instance);
1128 EXPORT_SYMBOL_GPL(udsl_put_instance);
1129 EXPORT_SYMBOL_GPL(udsl_instance_setup);
1130 EXPORT_SYMBOL_GPL(udsl_instance_disconnect);
1131
1132 /***********
1133 ** init **
1134 ***********/
1135
1136 static int __init udsl_usb_init(void)
1137 {
1138 dbg("udsl_usb_init: driver version " DRIVER_VERSION);
1139
1140 if (sizeof(struct udsl_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1141 printk(KERN_ERR __FILE__ ": unusable with this kernel!\n");
1142 return -EIO;
1143 }
1144
1145 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1146 || (num_snd_urbs > UDSL_MAX_SND_URBS)
1147 || (num_rcv_bufs > UDSL_MAX_RCV_BUFS)
1148 || (num_snd_bufs > UDSL_MAX_SND_BUFS)
1149 || (rcv_buf_size > UDSL_MAX_RCV_BUF_SIZE)
1150 || (snd_buf_size > UDSL_MAX_SND_BUF_SIZE))
1151 return -EINVAL;
1152
1153 return 0;
1154 }
1155
1156 static void __exit udsl_usb_exit(void)
1157 {
1158 }
1159
1160 module_init(udsl_usb_init);
1161 module_exit(udsl_usb_exit);
1162
1163 MODULE_AUTHOR(DRIVER_AUTHOR);
1164 MODULE_DESCRIPTION(DRIVER_DESC);
1165 MODULE_LICENSE("GPL");
1166 MODULE_VERSION(DRIVER_VERSION);
1167
1168 /************
1169 ** debug **
1170 ************/
1171
1172 #ifdef VERBOSE_DEBUG
1173 static int udsl_print_packet(const unsigned char *data, int len)
1174 {
1175 unsigned char buffer[256];
1176 int i = 0, j = 0;
1177
1178 for (i = 0; i < len;) {
1179 buffer[0] = '\0';
1180 sprintf(buffer, "%.3d :", i);
1181 for (j = 0; (j < 16) && (i < len); j++, i++) {
1182 sprintf(buffer, "%s %2.2x", buffer, data[i]);
1183 }
1184 dbg("%s", buffer);
1185 }
1186 return i;
1187 }
1188 #endif
linux-next