blob: b3f779f5933a6872bcd691f69d69f7d283b1da66 [file] [log] [blame]
Duncan Sandsc59bba72005-05-11 20:24:03 +02001/******************************************************************************
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>
Duncan Sands227d7762006-01-13 10:13:19 +010075#include <linux/netdevice.h>
Duncan Sandsc59bba72005-05-11 20:24:03 +020076#include <linux/proc_fs.h>
77#include <linux/sched.h>
78#include <linux/signal.h>
79#include <linux/slab.h>
80#include <linux/smp_lock.h>
81#include <linux/stat.h>
82#include <linux/timer.h>
83#include <linux/wait.h>
84
85#ifdef VERBOSE_DEBUG
86static int usbatm_print_packet(const unsigned char *data, int len);
87#define PACKETDEBUG(arg...) usbatm_print_packet (arg)
88#define vdbg(arg...) dbg (arg)
89#else
90#define PACKETDEBUG(arg...)
91#define vdbg(arg...)
92#endif
93
94#define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
Duncan Sands9b0e54a2006-01-13 11:08:05 +010095#define DRIVER_VERSION "1.10"
Duncan Sandsc59bba72005-05-11 20:24:03 +020096#define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
97
98static const char usbatm_driver_name[] = "usbatm";
99
100#define UDSL_MAX_RCV_URBS 16
101#define UDSL_MAX_SND_URBS 16
Duncan Sands6275cdf2006-04-28 18:52:16 +0200102#define UDSL_MAX_BUF_SIZE 65536
Duncan Sandsc59bba72005-05-11 20:24:03 +0200103#define UDSL_DEFAULT_RCV_URBS 4
104#define UDSL_DEFAULT_SND_URBS 4
Duncan Sands6275cdf2006-04-28 18:52:16 +0200105#define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
106#define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
Duncan Sandsc59bba72005-05-11 20:24:03 +0200107
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
112static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
113static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
Duncan Sands6f749472006-01-13 10:52:38 +0100114static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
115static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200116
117module_param(num_rcv_urbs, uint, S_IRUGO);
118MODULE_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
123module_param(num_snd_urbs, uint, S_IRUGO);
124MODULE_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
Duncan Sands6f749472006-01-13 10:52:38 +0100129module_param(rcv_buf_bytes, uint, S_IRUGO);
130MODULE_PARM_DESC(rcv_buf_bytes,
131 "Size of the buffers used for reception, in bytes (range: 1-"
132 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
Duncan Sandsc59bba72005-05-11 20:24:03 +0200133 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
134
Duncan Sands6f749472006-01-13 10:52:38 +0100135module_param(snd_buf_bytes, uint, S_IRUGO);
136MODULE_PARM_DESC(snd_buf_bytes,
137 "Size of the buffers used for transmission, in bytes (range: 1-"
Duncan Sands6275cdf2006-04-28 18:52:16 +0200138 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
Duncan Sandsc59bba72005-05-11 20:24:03 +0200139 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
140
141
142/* receive */
143
144struct 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
158struct 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
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100169static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200170static int usbatm_atm_open(struct atm_vcc *vcc);
171static void usbatm_atm_close(struct atm_vcc *vcc);
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100172static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200173static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
174static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
175
176static 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
191static 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
197static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
198{
199 if (vcc->pop)
200 vcc->pop(vcc, skb);
201 else
Duncan Sands227d7762006-01-13 10:13:19 +0100202 dev_kfree_skb_any(skb);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200203}
204
205
206/***********
207** urbs **
208************/
209
Arjan van de Ven858119e2006-01-14 13:20:43 -0800210static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200211{
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
Arjan van de Ven858119e2006-01-14 13:20:43 -0800227static int usbatm_submit_urb(struct urb *urb)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200228{
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) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100237 if (printk_ratelimit())
238 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
239 __func__, urb, ret);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200240
241 /* consider all errors transient and return the buffer back to the queue */
242 urb->status = -EAGAIN;
243 spin_lock_irq(&channel->lock);
244
245 /* must add to the front when sending; doesn't matter when receiving */
246 list_add(&urb->urb_list, &channel->list);
247
248 spin_unlock_irq(&channel->lock);
249
250 /* make sure the channel doesn't stall */
251 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
252 }
253
254 return ret;
255}
256
David Howells7d12e782006-10-05 14:55:46 +0100257static void usbatm_complete(struct urb *urb)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200258{
259 struct usbatm_channel *channel = urb->context;
260 unsigned long flags;
261
262 vdbg("%s: urb 0x%p, status %d, actual_length %d",
263 __func__, urb, urb->status, urb->actual_length);
264
265 /* usually in_interrupt(), but not always */
266 spin_lock_irqsave(&channel->lock, flags);
267
268 /* must add to the back when receiving; doesn't matter when sending */
269 list_add_tail(&urb->urb_list, &channel->list);
270
271 spin_unlock_irqrestore(&channel->lock, flags);
272
Duncan Sandsa3673d32006-01-13 11:12:58 +0100273 if (unlikely(urb->status) &&
274 (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
275 urb->status != -EILSEQ ))
276 {
Simon Arlott7d5e1dd2007-04-26 00:38:04 -0700277 if (urb->status == -ESHUTDOWN)
278 return;
279
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100280 if (printk_ratelimit())
281 atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
282 __func__, urb, urb->status);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200283 /* throttle processing in case of an error */
284 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100285 } else
Duncan Sandsc59bba72005-05-11 20:24:03 +0200286 tasklet_schedule(&channel->tasklet);
287}
288
289
290/*************
291** decode **
292*************/
293
294static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
295 short vpi, int vci)
296{
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100297 struct usbatm_vcc_data *vcc_data;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200298
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100299 list_for_each_entry(vcc_data, &instance->vcc_list, list)
300 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
301 return vcc_data;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200302 return NULL;
303}
304
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100305static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200306{
Duncan Sandsc59bba72005-05-11 20:24:03 +0200307 struct atm_vcc *vcc;
308 struct sk_buff *sarb;
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100309 short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
310 int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
311 u8 pti = ((source[3] & 0xe) >> 1);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200312
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100313 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200314
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100315 if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
316 instance->cached_vpi = vpi;
317 instance->cached_vci = vci;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200318
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100319 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
Duncan Sandse20d6642005-05-26 14:32:51 +0200320
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100321 if (!instance->cached_vcc)
322 atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
323 }
Duncan Sandse20d6642005-05-26 14:32:51 +0200324
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100325 if (!instance->cached_vcc)
326 return;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200327
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100328 vcc = instance->cached_vcc->vcc;
Duncan Sandse20d6642005-05-26 14:32:51 +0200329
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100330 /* OAM F5 end-to-end */
331 if (pti == ATM_PTI_E2EF5) {
332 if (printk_ratelimit())
333 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
334 __func__, vpi, vci);
335 atomic_inc(&vcc->stats->rx_err);
336 return;
337 }
Duncan Sandsc59bba72005-05-11 20:24:03 +0200338
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100339 sarb = instance->cached_vcc->sarb;
340
Arnaldo Carvalho de Melo4305b542007-04-19 20:43:29 -0700341 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100342 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
343 __func__, sarb->len, vcc);
344 /* discard cells already received */
345 skb_trim(sarb, 0);
Arnaldo Carvalho de Melo4305b542007-04-19 20:43:29 -0700346 UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100347 }
348
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700349 memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100350 __skb_put(sarb, ATM_CELL_PAYLOAD);
351
352 if (pti & 1) {
353 struct sk_buff *skb;
354 unsigned int length;
355 unsigned int pdu_length;
356
357 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
358
359 /* guard against overflow */
360 if (length > ATM_MAX_AAL5_PDU) {
361 atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
362 __func__, length, vcc);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200363 atomic_inc(&vcc->stats->rx_err);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100364 goto out;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200365 }
366
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100367 pdu_length = usbatm_pdu_length(length);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200368
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100369 if (sarb->len < pdu_length) {
370 atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
371 __func__, pdu_length, sarb->len, vcc);
372 atomic_inc(&vcc->stats->rx_err);
373 goto out;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200374 }
375
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700376 if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) {
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100377 atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
378 __func__, vcc);
379 atomic_inc(&vcc->stats->rx_err);
380 goto out;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200381 }
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100382
383 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
384
385 if (!(skb = dev_alloc_skb(length))) {
386 if (printk_ratelimit())
387 atm_err(instance, "%s: no memory for skb (length: %u)!\n",
388 __func__, length);
389 atomic_inc(&vcc->stats->rx_drop);
390 goto out;
391 }
392
393 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
394
395 if (!atm_charge(vcc, skb->truesize)) {
396 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
397 __func__, skb->truesize);
398 dev_kfree_skb_any(skb);
399 goto out; /* atm_charge increments rx_drop */
400 }
401
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -0300402 skb_copy_to_linear_data(skb,
403 skb_tail_pointer(sarb) - pdu_length,
404 length);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100405 __skb_put(skb, length);
406
407 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
408 __func__, skb, skb->len, skb->truesize);
409
410 PACKETDEBUG(skb->data, skb->len);
411
412 vcc->push(vcc, skb);
413
414 atomic_inc(&vcc->stats->rx);
415 out:
416 skb_trim(sarb, 0);
417 }
418}
419
420static void usbatm_extract_cells(struct usbatm_data *instance,
421 unsigned char *source, unsigned int avail_data)
422{
423 unsigned int stride = instance->rx_channel.stride;
424 unsigned int buf_usage = instance->buf_usage;
425
426 /* extract cells from incoming data, taking into account that
427 * the length of avail data may not be a multiple of stride */
428
429 if (buf_usage > 0) {
430 /* we have a partially received atm cell */
431 unsigned char *cell_buf = instance->cell_buf;
432 unsigned int space_left = stride - buf_usage;
433
434 UDSL_ASSERT(buf_usage <= stride);
435
436 if (avail_data >= space_left) {
437 /* add new data and process cell */
438 memcpy(cell_buf + buf_usage, source, space_left);
439 source += space_left;
440 avail_data -= space_left;
441 usbatm_extract_one_cell(instance, cell_buf);
442 instance->buf_usage = 0;
443 } else {
444 /* not enough data to fill the cell */
445 memcpy(cell_buf + buf_usage, source, avail_data);
446 instance->buf_usage = buf_usage + avail_data;
447 return;
448 }
449 }
450
451 for (; avail_data >= stride; avail_data -= stride, source += stride)
452 usbatm_extract_one_cell(instance, source);
453
454 if (avail_data > 0) {
455 /* length was not a multiple of stride -
456 * save remaining data for next call */
457 memcpy(instance->cell_buf, source, avail_data);
458 instance->buf_usage = avail_data;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200459 }
460}
461
462
463/*************
464** encode **
465*************/
466
467static unsigned int usbatm_write_cells(struct usbatm_data *instance,
468 struct sk_buff *skb,
469 u8 *target, unsigned int avail_space)
470{
471 struct usbatm_control *ctrl = UDSL_SKB(skb);
472 struct atm_vcc *vcc = ctrl->atm.vcc;
Duncan Sands6f749472006-01-13 10:52:38 +0100473 unsigned int bytes_written;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200474 unsigned int stride = instance->tx_channel.stride;
475
476 vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
477 UDSL_ASSERT(!(avail_space % stride));
478
Duncan Sands6f749472006-01-13 10:52:38 +0100479 for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
480 bytes_written += stride, target += stride) {
Duncan Sandsc59bba72005-05-11 20:24:03 +0200481 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
482 unsigned int left = ATM_CELL_PAYLOAD - data_len;
483 u8 *ptr = target;
484
485 ptr[0] = vcc->vpi >> 4;
486 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
487 ptr[2] = vcc->vci >> 4;
488 ptr[3] = vcc->vci << 4;
489 ptr[4] = 0xec;
490 ptr += ATM_CELL_HEADER;
491
Arnaldo Carvalho de Melod626f622007-03-27 18:55:52 -0300492 skb_copy_from_linear_data(skb, ptr, data_len);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200493 ptr += data_len;
494 __skb_pull(skb, data_len);
495
496 if(!left)
497 continue;
498
499 memset(ptr, 0, left);
500
501 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
502 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
503 /* trailer[0] = 0; UU = 0 */
504 /* trailer[1] = 0; CPI = 0 */
505 trailer[2] = ctrl->len >> 8;
506 trailer[3] = ctrl->len;
507
508 ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
509
510 trailer[4] = ctrl->crc >> 24;
511 trailer[5] = ctrl->crc >> 16;
512 trailer[6] = ctrl->crc >> 8;
513 trailer[7] = ctrl->crc;
514
515 target[3] |= 0x2; /* adjust PTI */
516
517 ctrl->len = 0; /* tag this skb finished */
518 }
519 else
520 ctrl->crc = crc32_be(ctrl->crc, ptr, left);
521 }
522
Duncan Sands6f749472006-01-13 10:52:38 +0100523 return bytes_written;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200524}
525
526
527/**************
528** receive **
529**************/
530
531static 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)) {
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100540 unsigned char *merge_start = NULL;
541 unsigned int merge_length = 0;
542 const unsigned int packet_size = instance->rx_channel.packet_size;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200543 int i;
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100544
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(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
Duncan Sandsc59bba72005-05-11 20:24:03 +0200570 if (!urb->status)
571 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100572 else
573 instance->buf_usage = 0;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200574
575 if (usbatm_submit_urb(urb))
576 return;
577 }
578}
579
580
581/***********
582** send **
583***********/
584
585static 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;
Duncan Sands6f749472006-01-13 10:52:38 +0100591 unsigned int bytes_written = 0;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200592 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;
Duncan Sands6f749472006-01-13 10:52:38 +0100603 bytes_written = (urb->status == -EAGAIN) ?
Duncan Sandsc59bba72005-05-11 20:24:03 +0200604 urb->transfer_buffer_length : 0;
605 }
606
Duncan Sands6f749472006-01-13 10:52:38 +0100607 bytes_written += usbatm_write_cells(instance, skb,
608 buffer + bytes_written,
609 buf_size - bytes_written);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200610
611 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
Duncan Sands6f749472006-01-13 10:52:38 +0100612 __func__, bytes_written, skb, urb);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200613
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
Duncan Sands6f749472006-01-13 10:52:38 +0100623 if (bytes_written == buf_size || (!skb && bytes_written)) {
624 urb->transfer_buffer_length = bytes_written;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200625
626 if (usbatm_submit_urb(urb))
627 break;
628 urb = NULL;
629 }
630 }
631
632 instance->current_skb = skb;
633}
634
635static 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 for (skb = instance->sndqueue.next, n = skb->next;
643 skb != (struct sk_buff *)&instance->sndqueue;
644 skb = n, n = skb->next)
645 if (UDSL_SKB(skb)->atm.vcc == vcc) {
646 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
647 __skb_unlink(skb, &instance->sndqueue);
648 usbatm_pop(vcc, skb);
649 }
650 spin_unlock_irq(&instance->sndqueue.lock);
651
652 tasklet_disable(&instance->tx_channel.tasklet);
653 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
654 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
655 instance->current_skb = NULL;
656 usbatm_pop(vcc, skb);
657 }
658 tasklet_enable(&instance->tx_channel.tasklet);
659 atm_dbg(instance, "%s done\n", __func__);
660}
661
662static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
663{
664 struct usbatm_data *instance = vcc->dev->dev_data;
665 struct usbatm_control *ctrl = UDSL_SKB(skb);
666 int err;
667
668 vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
669
Duncan Sands0e42a622006-01-13 10:05:15 +0100670 /* racy disconnection check - fine */
671 if (!instance || instance->disconnected) {
672#ifdef DEBUG
673 if (printk_ratelimit())
674 printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
675#endif
Duncan Sandsc59bba72005-05-11 20:24:03 +0200676 err = -ENODEV;
677 goto fail;
678 }
679
680 if (vcc->qos.aal != ATM_AAL5) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100681 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200682 err = -EINVAL;
683 goto fail;
684 }
685
686 if (skb->len > ATM_MAX_AAL5_PDU) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100687 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
Duncan Sandsc59bba72005-05-11 20:24:03 +0200688 __func__, skb->len, ATM_MAX_AAL5_PDU);
689 err = -EINVAL;
690 goto fail;
691 }
692
693 PACKETDEBUG(skb->data, skb->len);
694
695 /* initialize the control block */
696 ctrl->atm.vcc = vcc;
697 ctrl->len = skb->len;
698 ctrl->crc = crc32_be(~0, skb->data, skb->len);
699
700 skb_queue_tail(&instance->sndqueue, skb);
701 tasklet_schedule(&instance->tx_channel.tasklet);
702
703 return 0;
704
705 fail:
706 usbatm_pop(vcc, skb);
707 return err;
708}
709
710
711/********************
712** bean counting **
713********************/
714
715static void usbatm_destroy_instance(struct kref *kref)
716{
717 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
718
719 dbg("%s", __func__);
720
721 tasklet_kill(&instance->rx_channel.tasklet);
722 tasklet_kill(&instance->tx_channel.tasklet);
723 usb_put_dev(instance->usb_dev);
724 kfree(instance);
725}
726
Adrian Bunk3d485862005-11-20 23:56:11 +0100727static void usbatm_get_instance(struct usbatm_data *instance)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200728{
729 dbg("%s", __func__);
730
731 kref_get(&instance->refcount);
732}
733
Adrian Bunk3d485862005-11-20 23:56:11 +0100734static void usbatm_put_instance(struct usbatm_data *instance)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200735{
736 dbg("%s", __func__);
737
738 kref_put(&instance->refcount, usbatm_destroy_instance);
739}
740
741
742/**********
743** ATM **
744**********/
745
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100746static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200747{
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100748 struct usbatm_data *instance = atm_dev->dev_data;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200749
750 dbg("%s", __func__);
751
752 if (!instance)
753 return;
754
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100755 atm_dev->dev_data = NULL; /* catch bugs */
Duncan Sandsc59bba72005-05-11 20:24:03 +0200756 usbatm_put_instance(instance); /* taken in usbatm_atm_init */
757}
758
759static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
760{
761 struct usbatm_data *instance = atm_dev->dev_data;
762 int left = *pos;
763
764 if (!instance) {
765 dbg("%s: NULL instance!", __func__);
766 return -ENODEV;
767 }
768
769 if (!left--)
770 return sprintf(page, "%s\n", instance->description);
771
772 if (!left--)
773 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
774 atm_dev->esi[0], atm_dev->esi[1],
775 atm_dev->esi[2], atm_dev->esi[3],
776 atm_dev->esi[4], atm_dev->esi[5]);
777
778 if (!left--)
779 return sprintf(page,
780 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
781 atomic_read(&atm_dev->stats.aal5.tx),
782 atomic_read(&atm_dev->stats.aal5.tx_err),
783 atomic_read(&atm_dev->stats.aal5.rx),
784 atomic_read(&atm_dev->stats.aal5.rx_err),
785 atomic_read(&atm_dev->stats.aal5.rx_drop));
786
Duncan Sands0e42a622006-01-13 10:05:15 +0100787 if (!left--) {
788 if (instance->disconnected)
789 return sprintf(page, "Disconnected\n");
790 else
791 switch (atm_dev->signal) {
792 case ATM_PHY_SIG_FOUND:
793 return sprintf(page, "Line up\n");
794 case ATM_PHY_SIG_LOST:
795 return sprintf(page, "Line down\n");
796 default:
797 return sprintf(page, "Line state unknown\n");
798 }
799 }
Duncan Sandsc59bba72005-05-11 20:24:03 +0200800
801 return 0;
802}
803
804static int usbatm_atm_open(struct atm_vcc *vcc)
805{
806 struct usbatm_data *instance = vcc->dev->dev_data;
807 struct usbatm_vcc_data *new = NULL;
808 int ret;
809 int vci = vcc->vci;
810 short vpi = vcc->vpi;
811
812 if (!instance) {
813 dbg("%s: NULL data!", __func__);
814 return -ENODEV;
815 }
816
817 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
818
819 /* only support AAL5 */
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100820 if ((vcc->qos.aal != ATM_AAL5)) {
821 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200822 return -EINVAL;
823 }
824
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100825 /* sanity checks */
826 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
827 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
828 return -EINVAL;
829 }
830
Arjan van de Venab3c81f2006-01-13 15:52:55 +0100831 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
Duncan Sandsc59bba72005-05-11 20:24:03 +0200832
Duncan Sands0e42a622006-01-13 10:05:15 +0100833 if (instance->disconnected) {
834 atm_dbg(instance, "%s: disconnected!\n", __func__);
835 ret = -ENODEV;
836 goto fail;
837 }
838
Duncan Sandsc59bba72005-05-11 20:24:03 +0200839 if (usbatm_find_vcc(instance, vpi, vci)) {
840 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
841 ret = -EADDRINUSE;
842 goto fail;
843 }
844
Duncan Sands9a734ef2006-01-13 09:38:22 +0100845 if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100846 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200847 ret = -ENOMEM;
848 goto fail;
849 }
850
Duncan Sandsc59bba72005-05-11 20:24:03 +0200851 new->vcc = vcc;
852 new->vpi = vpi;
853 new->vci = vci;
854
855 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
856 if (!new->sarb) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100857 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200858 ret = -ENOMEM;
859 goto fail;
860 }
861
862 vcc->dev_data = new;
863
864 tasklet_disable(&instance->rx_channel.tasklet);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100865 instance->cached_vcc = new;
866 instance->cached_vpi = vpi;
867 instance->cached_vci = vci;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200868 list_add(&new->list, &instance->vcc_list);
869 tasklet_enable(&instance->rx_channel.tasklet);
870
871 set_bit(ATM_VF_ADDR, &vcc->flags);
872 set_bit(ATM_VF_PARTIAL, &vcc->flags);
873 set_bit(ATM_VF_READY, &vcc->flags);
874
Arjan van de Venab3c81f2006-01-13 15:52:55 +0100875 mutex_unlock(&instance->serialize);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200876
877 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
878
879 return 0;
880
881fail:
882 kfree(new);
Arjan van de Venab3c81f2006-01-13 15:52:55 +0100883 mutex_unlock(&instance->serialize);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200884 return ret;
885}
886
887static void usbatm_atm_close(struct atm_vcc *vcc)
888{
889 struct usbatm_data *instance = vcc->dev->dev_data;
890 struct usbatm_vcc_data *vcc_data = vcc->dev_data;
891
892 if (!instance || !vcc_data) {
893 dbg("%s: NULL data!", __func__);
894 return;
895 }
896
897 atm_dbg(instance, "%s entered\n", __func__);
898
899 atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
900 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
901
902 usbatm_cancel_send(instance, vcc);
903
Arjan van de Venab3c81f2006-01-13 15:52:55 +0100904 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
Duncan Sandsc59bba72005-05-11 20:24:03 +0200905
906 tasklet_disable(&instance->rx_channel.tasklet);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100907 if (instance->cached_vcc == vcc_data) {
908 instance->cached_vcc = NULL;
909 instance->cached_vpi = ATM_VPI_UNSPEC;
910 instance->cached_vci = ATM_VCI_UNSPEC;
911 }
Duncan Sandsc59bba72005-05-11 20:24:03 +0200912 list_del(&vcc_data->list);
913 tasklet_enable(&instance->rx_channel.tasklet);
914
915 kfree_skb(vcc_data->sarb);
916 vcc_data->sarb = NULL;
917
918 kfree(vcc_data);
919 vcc->dev_data = NULL;
920
921 vcc->vpi = ATM_VPI_UNSPEC;
922 vcc->vci = ATM_VCI_UNSPEC;
923 clear_bit(ATM_VF_READY, &vcc->flags);
924 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
925 clear_bit(ATM_VF_ADDR, &vcc->flags);
926
Arjan van de Venab3c81f2006-01-13 15:52:55 +0100927 mutex_unlock(&instance->serialize);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200928
929 atm_dbg(instance, "%s successful\n", __func__);
930}
931
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100932static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
Duncan Sandsc59bba72005-05-11 20:24:03 +0200933 void __user * arg)
934{
Duncan Sands0e42a622006-01-13 10:05:15 +0100935 struct usbatm_data *instance = atm_dev->dev_data;
936
937 if (!instance || instance->disconnected) {
938 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance");
939 return -ENODEV;
940 }
941
Duncan Sandsc59bba72005-05-11 20:24:03 +0200942 switch (cmd) {
943 case ATM_QUERYLOOP:
944 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
945 default:
946 return -ENOIOCTLCMD;
947 }
948}
949
950static int usbatm_atm_init(struct usbatm_data *instance)
951{
952 struct atm_dev *atm_dev;
953 int ret, i;
954
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100955 /* ATM init. The ATM initialization scheme suffers from an intrinsic race
956 * condition: callbacks we register can be executed at once, before we have
957 * initialized the struct atm_dev. To protect against this, all callbacks
958 * abort if atm_dev->dev_data is NULL. */
Duncan Sandsc59bba72005-05-11 20:24:03 +0200959 atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL);
960 if (!atm_dev) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100961 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200962 return -1;
963 }
964
965 instance->atm_dev = atm_dev;
966
967 atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
968 atm_dev->ci_range.vci_bits = ATM_CI_MAX;
969 atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
970
971 /* temp init ATM device, set to 128kbit */
972 atm_dev->link_rate = 128 * 1000 / 424;
973
Simon Arlotte9b8daf2007-03-06 02:47:43 -0800974 ret = sysfs_create_link(&atm_dev->class_dev.kobj,
975 &instance->usb_intf->dev.kobj, "device");
976 if (ret) {
977 atm_err(instance, "%s: sysfs_create_link failed: %d\n",
978 __func__, ret);
979 goto fail_sysfs;
980 }
981
Duncan Sandsc59bba72005-05-11 20:24:03 +0200982 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100983 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200984 goto fail;
985 }
986
Duncan Sandsc59bba72005-05-11 20:24:03 +0200987 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100988
989 /* ready for ATM callbacks */
Duncan Sandsc59bba72005-05-11 20:24:03 +0200990 mb();
991 atm_dev->dev_data = instance;
992
993 /* submit all rx URBs */
994 for (i = 0; i < num_rcv_urbs; i++)
995 usbatm_submit_urb(instance->urbs[i]);
996
997 return 0;
998
999 fail:
Simon Arlotte9b8daf2007-03-06 02:47:43 -08001000 sysfs_remove_link(&atm_dev->class_dev.kobj, "device");
1001 fail_sysfs:
Duncan Sandsc59bba72005-05-11 20:24:03 +02001002 instance->atm_dev = NULL;
Stanislaw Gruszka64bf69d2005-11-29 16:16:41 -08001003 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
Duncan Sandsc59bba72005-05-11 20:24:03 +02001004 return ret;
1005}
1006
1007
1008/**********
1009** USB **
1010**********/
1011
1012static int usbatm_do_heavy_init(void *arg)
1013{
1014 struct usbatm_data *instance = arg;
1015 int ret;
1016
1017 daemonize(instance->driver->driver_name);
1018 allow_signal(SIGTERM);
Andrew Morton521b6002006-10-10 14:42:46 -07001019 instance->thread_pid = current->pid;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001020
1021 complete(&instance->thread_started);
1022
1023 ret = instance->driver->heavy_init(instance, instance->usb_intf);
1024
1025 if (!ret)
1026 ret = usbatm_atm_init(instance);
1027
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001028 mutex_lock(&instance->serialize);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001029 instance->thread_pid = -1;
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001030 mutex_unlock(&instance->serialize);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001031
1032 complete_and_exit(&instance->thread_exited, ret);
1033}
1034
1035static int usbatm_heavy_init(struct usbatm_data *instance)
1036{
1037 int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL);
1038
1039 if (ret < 0) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +01001040 usb_err(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001041 return ret;
1042 }
1043
Duncan Sandsc59bba72005-05-11 20:24:03 +02001044 wait_for_completion(&instance->thread_started);
1045
1046 return 0;
1047}
1048
1049static void usbatm_tasklet_schedule(unsigned long data)
1050{
1051 tasklet_schedule((struct tasklet_struct *) data);
1052}
1053
Duncan Sandsfcf48302006-04-28 18:53:45 +02001054static void usbatm_init_channel(struct usbatm_channel *channel)
Duncan Sandsc59bba72005-05-11 20:24:03 +02001055{
1056 spin_lock_init(&channel->lock);
1057 INIT_LIST_HEAD(&channel->list);
1058 channel->delay.function = usbatm_tasklet_schedule;
1059 channel->delay.data = (unsigned long) &channel->tasklet;
1060 init_timer(&channel->delay);
1061}
1062
1063int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
1064 struct usbatm_driver *driver)
1065{
1066 struct device *dev = &intf->dev;
1067 struct usb_device *usb_dev = interface_to_usbdev(intf);
1068 struct usbatm_data *instance;
1069 char *buf;
1070 int error = -ENOMEM;
1071 int i, length;
Duncan Sands6f749472006-01-13 10:52:38 +01001072 unsigned int maxpacket, num_packets;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001073
Duncan Sands0ec3c7e2006-01-17 11:15:13 +01001074 dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",
Duncan Sandsc59bba72005-05-11 20:24:03 +02001075 __func__, driver->driver_name,
1076 le16_to_cpu(usb_dev->descriptor.idVendor),
1077 le16_to_cpu(usb_dev->descriptor.idProduct),
1078 intf->altsetting->desc.bInterfaceNumber);
1079
1080 /* instance init */
Pekka Enberg7b842b62005-09-06 15:18:34 -07001081 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001082 if (!instance) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +01001083 dev_err(dev, "%s: no memory for instance data!\n", __func__);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001084 return -ENOMEM;
1085 }
1086
Duncan Sandsc59bba72005-05-11 20:24:03 +02001087 /* public fields */
1088
1089 instance->driver = driver;
1090 snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
1091
1092 instance->usb_dev = usb_dev;
1093 instance->usb_intf = intf;
1094
1095 buf = instance->description;
1096 length = sizeof(instance->description);
1097
1098 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
1099 goto bind;
1100
1101 buf += i;
1102 length -= i;
1103
1104 i = scnprintf(buf, length, " (");
1105 buf += i;
1106 length -= i;
1107
1108 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1109 goto bind;
1110
1111 buf += i;
1112 length -= i;
1113
1114 snprintf(buf, length, ")");
1115
1116 bind:
Duncan Sands35644b02006-01-17 11:16:13 +01001117 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +01001118 dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001119 goto fail_free;
1120 }
1121
1122 /* private fields */
1123
1124 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001125 mutex_init(&instance->serialize);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001126
1127 instance->thread_pid = -1;
1128 init_completion(&instance->thread_started);
1129 init_completion(&instance->thread_exited);
1130
1131 INIT_LIST_HEAD(&instance->vcc_list);
Duncan Sands80aae7a2006-01-13 10:59:23 +01001132 skb_queue_head_init(&instance->sndqueue);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001133
1134 usbatm_init_channel(&instance->rx_channel);
1135 usbatm_init_channel(&instance->tx_channel);
1136 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1137 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001138 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1139 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001140 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1141
Duncan Sands80aae7a2006-01-13 10:59:23 +01001142 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
1143 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
1144 else
1145 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
1146
1147 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
1148
Duncan Sands6f749472006-01-13 10:52:38 +01001149 /* tx buffer size must be a positive multiple of the stride */
1150 instance->tx_channel.buf_size = max (instance->tx_channel.stride,
1151 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
1152
1153 /* rx buffer size must be a positive multiple of the endpoint maxpacket */
1154 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0);
1155
1156 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
1157 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
1158 usb_pipeendpoint(instance->rx_channel.endpoint));
1159 error = -EINVAL;
1160 goto fail_unbind;
1161 }
1162
1163 num_packets = max (1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
1164
1165 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
1166 num_packets--;
1167
1168 instance->rx_channel.buf_size = num_packets * maxpacket;
Duncan Sands80aae7a2006-01-13 10:59:23 +01001169 instance->rx_channel.packet_size = maxpacket;
Duncan Sands6f749472006-01-13 10:52:38 +01001170
1171#ifdef DEBUG
1172 for (i = 0; i < 2; i++) {
1173 struct usbatm_channel *channel = i ?
1174 &instance->tx_channel : &instance->rx_channel;
1175
1176 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel);
1177 }
1178#endif
1179
Duncan Sands80aae7a2006-01-13 10:59:23 +01001180 /* initialize urbs */
Duncan Sandsc59bba72005-05-11 20:24:03 +02001181
1182 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
Duncan Sandsc59bba72005-05-11 20:24:03 +02001183 u8 *buffer;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001184 struct usbatm_channel *channel = i < num_rcv_urbs ?
1185 &instance->rx_channel : &instance->tx_channel;
Duncan Sands80aae7a2006-01-13 10:59:23 +01001186 struct urb *urb;
1187 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001188
Duncan Sands80aae7a2006-01-13 10:59:23 +01001189 UDSL_ASSERT(!usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint));
Duncan Sandsc59bba72005-05-11 20:24:03 +02001190
1191 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1192 if (!urb) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +01001193 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
Duncan Sands72ef8ab2006-01-13 10:07:08 +01001194 error = -ENOMEM;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001195 goto fail_unbind;
1196 }
1197
Duncan Sands65412e42005-05-27 10:00:08 +02001198 instance->urbs[i] = urb;
1199
Duncan Sands9a734ef2006-01-13 09:38:22 +01001200 /* zero the tx padding to avoid leaking information */
1201 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001202 if (!buffer) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +01001203 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
Duncan Sands72ef8ab2006-01-13 10:07:08 +01001204 error = -ENOMEM;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001205 goto fail_unbind;
1206 }
Duncan Sandsc59bba72005-05-11 20:24:03 +02001207
1208 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1209 buffer, channel->buf_size, usbatm_complete, channel);
1210 if (iso_packets) {
1211 int j;
1212 urb->interval = 1;
1213 urb->transfer_flags = URB_ISO_ASAP;
1214 urb->number_of_packets = iso_packets;
1215 for (j = 0; j < iso_packets; j++) {
Duncan Sands80aae7a2006-01-13 10:59:23 +01001216 urb->iso_frame_desc[j].offset = channel->packet_size * j;
1217 urb->iso_frame_desc[j].length = channel->packet_size;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001218 }
1219 }
1220
1221 /* put all tx URBs on the list of spares */
1222 if (i >= num_rcv_urbs)
1223 list_add_tail(&urb->urb_list, &channel->list);
1224
1225 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1226 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001227 }
1228
Duncan Sandse3fb2f62006-01-13 11:06:46 +01001229 instance->cached_vpi = ATM_VPI_UNSPEC;
1230 instance->cached_vci = ATM_VCI_UNSPEC;
1231 instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
1232
1233 if (!instance->cell_buf) {
1234 dev_err(dev, "%s: no memory for cell buffer!\n", __func__);
1235 error = -ENOMEM;
1236 goto fail_unbind;
1237 }
1238
Duncan Sands35644b02006-01-17 11:16:13 +01001239 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
Duncan Sandsc59bba72005-05-11 20:24:03 +02001240 error = usbatm_heavy_init(instance);
1241 } else {
1242 complete(&instance->thread_exited); /* pretend that heavy_init was run */
1243 error = usbatm_atm_init(instance);
1244 }
1245
1246 if (error < 0)
1247 goto fail_unbind;
1248
1249 usb_get_dev(usb_dev);
1250 usb_set_intfdata(intf, instance);
1251
1252 return 0;
1253
1254 fail_unbind:
1255 if (instance->driver->unbind)
1256 instance->driver->unbind(instance, intf);
1257 fail_free:
Duncan Sandse3fb2f62006-01-13 11:06:46 +01001258 kfree(instance->cell_buf);
1259
Duncan Sandsc59bba72005-05-11 20:24:03 +02001260 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1261 if (instance->urbs[i])
1262 kfree(instance->urbs[i]->transfer_buffer);
1263 usb_free_urb(instance->urbs[i]);
1264 }
1265
1266 kfree (instance);
1267
1268 return error;
1269}
1270EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1271
1272void usbatm_usb_disconnect(struct usb_interface *intf)
1273{
1274 struct device *dev = &intf->dev;
1275 struct usbatm_data *instance = usb_get_intfdata(intf);
Duncan Sands0e42a622006-01-13 10:05:15 +01001276 struct usbatm_vcc_data *vcc_data;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001277 int i;
1278
1279 dev_dbg(dev, "%s entered\n", __func__);
1280
1281 if (!instance) {
1282 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1283 return;
1284 }
1285
1286 usb_set_intfdata(intf, NULL);
1287
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001288 mutex_lock(&instance->serialize);
Duncan Sands0e42a622006-01-13 10:05:15 +01001289 instance->disconnected = 1;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001290 if (instance->thread_pid >= 0)
1291 kill_proc(instance->thread_pid, SIGTERM, 1);
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001292 mutex_unlock(&instance->serialize);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001293
1294 wait_for_completion(&instance->thread_exited);
1295
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001296 mutex_lock(&instance->serialize);
Duncan Sands0e42a622006-01-13 10:05:15 +01001297 list_for_each_entry(vcc_data, &instance->vcc_list, list)
1298 vcc_release_async(vcc_data->vcc, -EPIPE);
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001299 mutex_unlock(&instance->serialize);
Duncan Sands0e42a622006-01-13 10:05:15 +01001300
Duncan Sandsc59bba72005-05-11 20:24:03 +02001301 tasklet_disable(&instance->rx_channel.tasklet);
1302 tasklet_disable(&instance->tx_channel.tasklet);
1303
1304 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1305 usb_kill_urb(instance->urbs[i]);
1306
1307 del_timer_sync(&instance->rx_channel.delay);
1308 del_timer_sync(&instance->tx_channel.delay);
1309
Duncan Sands0e42a622006-01-13 10:05:15 +01001310 /* turn usbatm_[rt]x_process into something close to a no-op */
1311 /* no need to take the spinlock */
1312 INIT_LIST_HEAD(&instance->rx_channel.list);
1313 INIT_LIST_HEAD(&instance->tx_channel.list);
1314
1315 tasklet_enable(&instance->rx_channel.tasklet);
1316 tasklet_enable(&instance->tx_channel.tasklet);
1317
Duncan Sandsc59bba72005-05-11 20:24:03 +02001318 if (instance->atm_dev && instance->driver->atm_stop)
1319 instance->driver->atm_stop(instance, instance->atm_dev);
1320
1321 if (instance->driver->unbind)
1322 instance->driver->unbind(instance, intf);
1323
1324 instance->driver_data = NULL;
1325
Duncan Sandsc59bba72005-05-11 20:24:03 +02001326 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1327 kfree(instance->urbs[i]->transfer_buffer);
1328 usb_free_urb(instance->urbs[i]);
1329 }
1330
Duncan Sandse3fb2f62006-01-13 11:06:46 +01001331 kfree(instance->cell_buf);
1332
Duncan Sandsc59bba72005-05-11 20:24:03 +02001333 /* ATM finalize */
Simon Arlotte9b8daf2007-03-06 02:47:43 -08001334 if (instance->atm_dev) {
1335 sysfs_remove_link(&instance->atm_dev->class_dev.kobj, "device");
Stanislaw Gruszka64bf69d2005-11-29 16:16:41 -08001336 atm_dev_deregister(instance->atm_dev);
Simon Arlotte9b8daf2007-03-06 02:47:43 -08001337 }
Duncan Sandsc59bba72005-05-11 20:24:03 +02001338
1339 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
1340}
1341EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1342
1343
1344/***********
1345** init **
1346***********/
1347
1348static int __init usbatm_usb_init(void)
1349{
1350 dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1351
1352 if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1353 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1354 return -EIO;
1355 }
1356
1357 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1358 || (num_snd_urbs > UDSL_MAX_SND_URBS)
Duncan Sands6f749472006-01-13 10:52:38 +01001359 || (rcv_buf_bytes < 1)
1360 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
1361 || (snd_buf_bytes < 1)
1362 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
Duncan Sandsc59bba72005-05-11 20:24:03 +02001363 return -EINVAL;
1364
1365 return 0;
1366}
1367module_init(usbatm_usb_init);
1368
1369static void __exit usbatm_usb_exit(void)
1370{
1371 dbg("%s", __func__);
1372}
1373module_exit(usbatm_usb_exit);
1374
1375MODULE_AUTHOR(DRIVER_AUTHOR);
1376MODULE_DESCRIPTION(DRIVER_DESC);
1377MODULE_LICENSE("GPL");
1378MODULE_VERSION(DRIVER_VERSION);
1379
1380/************
1381** debug **
1382************/
1383
1384#ifdef VERBOSE_DEBUG
1385static int usbatm_print_packet(const unsigned char *data, int len)
1386{
1387 unsigned char buffer[256];
1388 int i = 0, j = 0;
1389
1390 for (i = 0; i < len;) {
1391 buffer[0] = '\0';
1392 sprintf(buffer, "%.3d :", i);
1393 for (j = 0; (j < 16) && (i < len); j++, i++) {
1394 sprintf(buffer, "%s %2.2x", buffer, data[i]);
1395 }
1396 dbg("%s", buffer);
1397 }
1398 return i;
1399}
1400#endif