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c59bba75 DS |
1 | /****************************************************************************** |
2 | * usbatm.c - Generic USB xDSL driver core | |
3 | * | |
4 | * Copyright (C) 2001, Alcatel | |
5 | * Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas | |
6 | * Copyright (C) 2004, David Woodhouse, Roman Kagan | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
11 | * any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
16 | * more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along with | |
19 | * this program; if not, write to the Free Software Foundation, Inc., 59 | |
20 | * Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | * | |
22 | ******************************************************************************/ | |
23 | ||
24 | /* | |
25 | * Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse | |
26 | * | |
27 | * 1.7+: - See the check-in logs | |
28 | * | |
29 | * 1.6: - No longer opens a connection if the firmware is not loaded | |
30 | * - Added support for the speedtouch 330 | |
31 | * - Removed the limit on the number of devices | |
32 | * - Module now autoloads on device plugin | |
33 | * - Merged relevant parts of sarlib | |
34 | * - Replaced the kernel thread with a tasklet | |
35 | * - New packet transmission code | |
36 | * - Changed proc file contents | |
37 | * - Fixed all known SMP races | |
38 | * - Many fixes and cleanups | |
39 | * - Various fixes by Oliver Neukum (oliver@neukum.name) | |
40 | * | |
41 | * 1.5A: - Version for inclusion in 2.5 series kernel | |
42 | * - Modifications by Richard Purdie (rpurdie@rpsys.net) | |
43 | * - made compatible with kernel 2.5.6 onwards by changing | |
44 | * usbatm_usb_send_data_context->urb to a pointer and adding code | |
45 | * to alloc and free it | |
46 | * - remove_wait_queue() added to usbatm_atm_processqueue_thread() | |
47 | * | |
48 | * 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL. | |
49 | * (reported by stephen.robinson@zen.co.uk) | |
50 | * | |
51 | * 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave() | |
52 | * - unlink all active send urbs of a vcc that is being closed. | |
53 | * | |
54 | * 1.3.1: - added the version number | |
55 | * | |
56 | * 1.3: - Added multiple send urb support | |
57 | * - fixed memory leak and vcc->tx_inuse starvation bug | |
58 | * when not enough memory left in vcc. | |
59 | * | |
60 | * 1.2: - Fixed race condition in usbatm_usb_send_data() | |
61 | * 1.1: - Turned off packet debugging | |
62 | * | |
63 | */ | |
64 | ||
65 | #include "usbatm.h" | |
66 | ||
67 | #include <asm/uaccess.h> | |
68 | #include <linux/crc32.h> | |
69 | #include <linux/errno.h> | |
70 | #include <linux/init.h> | |
71 | #include <linux/interrupt.h> | |
72 | #include <linux/kernel.h> | |
73 | #include <linux/module.h> | |
74 | #include <linux/moduleparam.h> | |
75 | #include <linux/proc_fs.h> | |
76 | #include <linux/sched.h> | |
77 | #include <linux/signal.h> | |
78 | #include <linux/slab.h> | |
79 | #include <linux/smp_lock.h> | |
80 | #include <linux/stat.h> | |
81 | #include <linux/timer.h> | |
82 | #include <linux/wait.h> | |
83 | ||
84 | #ifdef VERBOSE_DEBUG | |
85 | static int usbatm_print_packet(const unsigned char *data, int len); | |
86 | #define PACKETDEBUG(arg...) usbatm_print_packet (arg) | |
87 | #define vdbg(arg...) dbg (arg) | |
88 | #else | |
89 | #define PACKETDEBUG(arg...) | |
90 | #define vdbg(arg...) | |
91 | #endif | |
92 | ||
93 | #define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>" | |
94 | #define DRIVER_VERSION "1.9" | |
95 | #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION | |
96 | ||
97 | static const char usbatm_driver_name[] = "usbatm"; | |
98 | ||
99 | #define UDSL_MAX_RCV_URBS 16 | |
100 | #define UDSL_MAX_SND_URBS 16 | |
101 | #define UDSL_MAX_RCV_BUF_SIZE 1024 /* ATM cells */ | |
102 | #define UDSL_MAX_SND_BUF_SIZE 1024 /* ATM cells */ | |
103 | #define UDSL_DEFAULT_RCV_URBS 4 | |
104 | #define UDSL_DEFAULT_SND_URBS 4 | |
105 | #define UDSL_DEFAULT_RCV_BUF_SIZE 64 /* ATM cells */ | |
106 | #define UDSL_DEFAULT_SND_BUF_SIZE 64 /* ATM cells */ | |
107 | ||
108 | #define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD) | |
109 | ||
110 | #define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */ | |
111 | ||
112 | static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS; | |
113 | static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS; | |
114 | static unsigned int rcv_buf_size = UDSL_DEFAULT_RCV_BUF_SIZE; | |
115 | static unsigned int snd_buf_size = UDSL_DEFAULT_SND_BUF_SIZE; | |
116 | ||
117 | module_param(num_rcv_urbs, uint, S_IRUGO); | |
118 | MODULE_PARM_DESC(num_rcv_urbs, | |
119 | "Number of urbs used for reception (range: 0-" | |
120 | __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: " | |
121 | __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")"); | |
122 | ||
123 | module_param(num_snd_urbs, uint, S_IRUGO); | |
124 | MODULE_PARM_DESC(num_snd_urbs, | |
125 | "Number of urbs used for transmission (range: 0-" | |
126 | __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: " | |
127 | __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")"); | |
128 | ||
129 | module_param(rcv_buf_size, uint, S_IRUGO); | |
130 | MODULE_PARM_DESC(rcv_buf_size, | |
131 | "Size of the buffers used for reception in ATM cells (range: 1-" | |
132 | __MODULE_STRING(UDSL_MAX_RCV_BUF_SIZE) ", default: " | |
133 | __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")"); | |
134 | ||
135 | module_param(snd_buf_size, uint, S_IRUGO); | |
136 | MODULE_PARM_DESC(snd_buf_size, | |
137 | "Size of the buffers used for transmission in ATM cells (range: 1-" | |
138 | __MODULE_STRING(UDSL_MAX_SND_BUF_SIZE) ", default: " | |
139 | __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")"); | |
140 | ||
141 | ||
142 | /* receive */ | |
143 | ||
144 | struct usbatm_vcc_data { | |
145 | /* vpi/vci lookup */ | |
146 | struct list_head list; | |
147 | short vpi; | |
148 | int vci; | |
149 | struct atm_vcc *vcc; | |
150 | ||
151 | /* raw cell reassembly */ | |
152 | struct sk_buff *sarb; | |
153 | }; | |
154 | ||
155 | ||
156 | /* send */ | |
157 | ||
158 | struct usbatm_control { | |
159 | struct atm_skb_data atm; | |
160 | u32 len; | |
161 | u32 crc; | |
162 | }; | |
163 | ||
164 | #define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb) | |
165 | ||
166 | ||
167 | /* ATM */ | |
168 | ||
0ec3c7e8 | 169 | static void usbatm_atm_dev_close(struct atm_dev *atm_dev); |
c59bba75 DS |
170 | static int usbatm_atm_open(struct atm_vcc *vcc); |
171 | static void usbatm_atm_close(struct atm_vcc *vcc); | |
0ec3c7e8 | 172 | static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg); |
c59bba75 DS |
173 | static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb); |
174 | static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page); | |
175 | ||
176 | static struct atmdev_ops usbatm_atm_devops = { | |
177 | .dev_close = usbatm_atm_dev_close, | |
178 | .open = usbatm_atm_open, | |
179 | .close = usbatm_atm_close, | |
180 | .ioctl = usbatm_atm_ioctl, | |
181 | .send = usbatm_atm_send, | |
182 | .proc_read = usbatm_atm_proc_read, | |
183 | .owner = THIS_MODULE, | |
184 | }; | |
185 | ||
186 | ||
187 | /*********** | |
188 | ** misc ** | |
189 | ***********/ | |
190 | ||
191 | static inline unsigned int usbatm_pdu_length(unsigned int length) | |
192 | { | |
193 | length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER; | |
194 | return length - length % ATM_CELL_PAYLOAD; | |
195 | } | |
196 | ||
197 | static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb) | |
198 | { | |
199 | if (vcc->pop) | |
200 | vcc->pop(vcc, skb); | |
201 | else | |
202 | dev_kfree_skb(skb); | |
203 | } | |
204 | ||
205 | ||
206 | /*********** | |
207 | ** urbs ** | |
208 | ************/ | |
209 | ||
858119e1 | 210 | static struct urb *usbatm_pop_urb(struct usbatm_channel *channel) |
c59bba75 DS |
211 | { |
212 | struct urb *urb; | |
213 | ||
214 | spin_lock_irq(&channel->lock); | |
215 | if (list_empty(&channel->list)) { | |
216 | spin_unlock_irq(&channel->lock); | |
217 | return NULL; | |
218 | } | |
219 | ||
220 | urb = list_entry(channel->list.next, struct urb, urb_list); | |
221 | list_del(&urb->urb_list); | |
222 | spin_unlock_irq(&channel->lock); | |
223 | ||
224 | return urb; | |
225 | } | |
226 | ||
858119e1 | 227 | static int usbatm_submit_urb(struct urb *urb) |
c59bba75 DS |
228 | { |
229 | struct usbatm_channel *channel = urb->context; | |
230 | int ret; | |
231 | ||
232 | vdbg("%s: submitting urb 0x%p, size %u", | |
233 | __func__, urb, urb->transfer_buffer_length); | |
234 | ||
235 | ret = usb_submit_urb(urb, GFP_ATOMIC); | |
236 | if (ret) { | |
0ec3c7e8 DS |
237 | if (printk_ratelimit()) |
238 | atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n", | |
239 | __func__, urb, ret); | |
c59bba75 DS |
240 | |
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 | ||
257 | static void usbatm_complete(struct urb *urb, struct pt_regs *regs) | |
258 | { | |
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 | ||
0ec3c7e8 DS |
273 | if (unlikely(urb->status)) { |
274 | if (printk_ratelimit()) | |
275 | atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n", | |
276 | __func__, urb, urb->status); | |
c59bba75 DS |
277 | /* throttle processing in case of an error */ |
278 | mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); | |
0ec3c7e8 | 279 | } else |
c59bba75 DS |
280 | tasklet_schedule(&channel->tasklet); |
281 | } | |
282 | ||
283 | ||
284 | /************* | |
285 | ** decode ** | |
286 | *************/ | |
287 | ||
288 | static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance, | |
289 | short vpi, int vci) | |
290 | { | |
0ec3c7e8 | 291 | struct usbatm_vcc_data *vcc_data; |
c59bba75 | 292 | |
0ec3c7e8 DS |
293 | list_for_each_entry(vcc_data, &instance->vcc_list, list) |
294 | if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi)) | |
295 | return vcc_data; | |
c59bba75 DS |
296 | return NULL; |
297 | } | |
298 | ||
299 | static void usbatm_extract_cells(struct usbatm_data *instance, | |
300 | unsigned char *source, unsigned int avail_data) | |
301 | { | |
302 | struct usbatm_vcc_data *cached_vcc = NULL; | |
303 | struct atm_vcc *vcc; | |
304 | struct sk_buff *sarb; | |
c59bba75 DS |
305 | unsigned int stride = instance->rx_channel.stride; |
306 | int vci, cached_vci = 0; | |
307 | short vpi, cached_vpi = 0; | |
308 | u8 pti; | |
309 | ||
310 | for (; avail_data >= stride; avail_data -= stride, source += stride) { | |
311 | vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4); | |
312 | vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4); | |
313 | pti = ((source[3] & 0xe) >> 1); | |
314 | ||
315 | vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti); | |
316 | ||
e20d6645 | 317 | if ((vci != cached_vci) || (vpi != cached_vpi)) { |
c59bba75 DS |
318 | cached_vpi = vpi; |
319 | cached_vci = vci; | |
e20d6645 DS |
320 | |
321 | cached_vcc = usbatm_find_vcc(instance, vpi, vci); | |
322 | ||
323 | if (!cached_vcc) | |
0ec3c7e8 | 324 | atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci); |
c59bba75 DS |
325 | } |
326 | ||
e20d6645 DS |
327 | if (!cached_vcc) |
328 | continue; | |
329 | ||
330 | vcc = cached_vcc->vcc; | |
c59bba75 DS |
331 | |
332 | /* OAM F5 end-to-end */ | |
333 | if (pti == ATM_PTI_E2EF5) { | |
0ec3c7e8 DS |
334 | if (printk_ratelimit()) |
335 | atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n", | |
336 | __func__, vpi, vci); | |
c59bba75 DS |
337 | atomic_inc(&vcc->stats->rx_err); |
338 | continue; | |
339 | } | |
340 | ||
e20d6645 | 341 | sarb = cached_vcc->sarb; |
c59bba75 DS |
342 | |
343 | if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) { | |
0ec3c7e8 | 344 | atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n", |
c59bba75 DS |
345 | __func__, sarb->len, vcc); |
346 | /* discard cells already received */ | |
347 | skb_trim(sarb, 0); | |
348 | UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end); | |
349 | } | |
350 | ||
351 | memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD); | |
352 | __skb_put(sarb, ATM_CELL_PAYLOAD); | |
353 | ||
354 | if (pti & 1) { | |
355 | struct sk_buff *skb; | |
356 | unsigned int length; | |
357 | unsigned int pdu_length; | |
358 | ||
359 | length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5]; | |
360 | ||
361 | /* guard against overflow */ | |
362 | if (length > ATM_MAX_AAL5_PDU) { | |
0ec3c7e8 | 363 | atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n", |
c59bba75 DS |
364 | __func__, length, vcc); |
365 | atomic_inc(&vcc->stats->rx_err); | |
366 | goto out; | |
367 | } | |
368 | ||
369 | pdu_length = usbatm_pdu_length(length); | |
370 | ||
371 | if (sarb->len < pdu_length) { | |
0ec3c7e8 | 372 | atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n", |
c59bba75 DS |
373 | __func__, pdu_length, sarb->len, vcc); |
374 | atomic_inc(&vcc->stats->rx_err); | |
375 | goto out; | |
376 | } | |
377 | ||
378 | if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) { | |
0ec3c7e8 | 379 | atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n", |
c59bba75 DS |
380 | __func__, vcc); |
381 | atomic_inc(&vcc->stats->rx_err); | |
382 | goto out; | |
383 | } | |
384 | ||
385 | vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc); | |
386 | ||
387 | if (!(skb = dev_alloc_skb(length))) { | |
0ec3c7e8 DS |
388 | if (printk_ratelimit()) |
389 | atm_err(instance, "%s: no memory for skb (length: %u)!\n", | |
390 | __func__, length); | |
c59bba75 DS |
391 | atomic_inc(&vcc->stats->rx_drop); |
392 | goto out; | |
393 | } | |
394 | ||
395 | vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize); | |
396 | ||
397 | if (!atm_charge(vcc, skb->truesize)) { | |
0ec3c7e8 DS |
398 | atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n", |
399 | __func__, skb->truesize); | |
c59bba75 DS |
400 | dev_kfree_skb(skb); |
401 | goto out; /* atm_charge increments rx_drop */ | |
402 | } | |
403 | ||
404 | memcpy(skb->data, sarb->tail - pdu_length, length); | |
405 | __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 | } | |
420 | ||
421 | ||
422 | /************* | |
423 | ** encode ** | |
424 | *************/ | |
425 | ||
426 | static unsigned int usbatm_write_cells(struct usbatm_data *instance, | |
427 | struct sk_buff *skb, | |
428 | u8 *target, unsigned int avail_space) | |
429 | { | |
430 | struct usbatm_control *ctrl = UDSL_SKB(skb); | |
431 | struct atm_vcc *vcc = ctrl->atm.vcc; | |
432 | unsigned int num_written; | |
433 | unsigned int stride = instance->tx_channel.stride; | |
434 | ||
435 | vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space); | |
436 | UDSL_ASSERT(!(avail_space % stride)); | |
437 | ||
438 | for (num_written = 0; num_written < avail_space && ctrl->len; | |
439 | num_written += stride, target += stride) { | |
440 | unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD); | |
441 | unsigned int left = ATM_CELL_PAYLOAD - data_len; | |
442 | u8 *ptr = target; | |
443 | ||
444 | ptr[0] = vcc->vpi >> 4; | |
445 | ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12); | |
446 | ptr[2] = vcc->vci >> 4; | |
447 | ptr[3] = vcc->vci << 4; | |
448 | ptr[4] = 0xec; | |
449 | ptr += ATM_CELL_HEADER; | |
450 | ||
451 | memcpy(ptr, skb->data, data_len); | |
452 | ptr += data_len; | |
453 | __skb_pull(skb, data_len); | |
454 | ||
455 | if(!left) | |
456 | continue; | |
457 | ||
458 | memset(ptr, 0, left); | |
459 | ||
460 | if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */ | |
461 | u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER; | |
462 | /* trailer[0] = 0; UU = 0 */ | |
463 | /* trailer[1] = 0; CPI = 0 */ | |
464 | trailer[2] = ctrl->len >> 8; | |
465 | trailer[3] = ctrl->len; | |
466 | ||
467 | ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4); | |
468 | ||
469 | trailer[4] = ctrl->crc >> 24; | |
470 | trailer[5] = ctrl->crc >> 16; | |
471 | trailer[6] = ctrl->crc >> 8; | |
472 | trailer[7] = ctrl->crc; | |
473 | ||
474 | target[3] |= 0x2; /* adjust PTI */ | |
475 | ||
476 | ctrl->len = 0; /* tag this skb finished */ | |
477 | } | |
478 | else | |
479 | ctrl->crc = crc32_be(ctrl->crc, ptr, left); | |
480 | } | |
481 | ||
482 | return num_written; | |
483 | } | |
484 | ||
485 | ||
486 | /************** | |
487 | ** receive ** | |
488 | **************/ | |
489 | ||
490 | static void usbatm_rx_process(unsigned long data) | |
491 | { | |
492 | struct usbatm_data *instance = (struct usbatm_data *)data; | |
493 | struct urb *urb; | |
494 | ||
495 | while ((urb = usbatm_pop_urb(&instance->rx_channel))) { | |
496 | vdbg("%s: processing urb 0x%p", __func__, urb); | |
497 | ||
498 | if (usb_pipeisoc(urb->pipe)) { | |
499 | int i; | |
500 | for (i = 0; i < urb->number_of_packets; i++) | |
501 | if (!urb->iso_frame_desc[i].status) | |
502 | usbatm_extract_cells(instance, | |
503 | (u8 *)urb->transfer_buffer + urb->iso_frame_desc[i].offset, | |
504 | urb->iso_frame_desc[i].actual_length); | |
505 | } | |
506 | else | |
507 | if (!urb->status) | |
508 | usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length); | |
509 | ||
510 | if (usbatm_submit_urb(urb)) | |
511 | return; | |
512 | } | |
513 | } | |
514 | ||
515 | ||
516 | /*********** | |
517 | ** send ** | |
518 | ***********/ | |
519 | ||
520 | static void usbatm_tx_process(unsigned long data) | |
521 | { | |
522 | struct usbatm_data *instance = (struct usbatm_data *)data; | |
523 | struct sk_buff *skb = instance->current_skb; | |
524 | struct urb *urb = NULL; | |
525 | const unsigned int buf_size = instance->tx_channel.buf_size; | |
526 | unsigned int num_written = 0; | |
527 | u8 *buffer = NULL; | |
528 | ||
529 | if (!skb) | |
530 | skb = skb_dequeue(&instance->sndqueue); | |
531 | ||
532 | while (skb) { | |
533 | if (!urb) { | |
534 | urb = usbatm_pop_urb(&instance->tx_channel); | |
535 | if (!urb) | |
536 | break; /* no more senders */ | |
537 | buffer = urb->transfer_buffer; | |
538 | num_written = (urb->status == -EAGAIN) ? | |
539 | urb->transfer_buffer_length : 0; | |
540 | } | |
541 | ||
542 | num_written += usbatm_write_cells(instance, skb, | |
543 | buffer + num_written, | |
544 | buf_size - num_written); | |
545 | ||
546 | vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p", | |
547 | __func__, num_written, skb, urb); | |
548 | ||
549 | if (!UDSL_SKB(skb)->len) { | |
550 | struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc; | |
551 | ||
552 | usbatm_pop(vcc, skb); | |
553 | atomic_inc(&vcc->stats->tx); | |
554 | ||
555 | skb = skb_dequeue(&instance->sndqueue); | |
556 | } | |
557 | ||
558 | if (num_written == buf_size || (!skb && num_written)) { | |
559 | urb->transfer_buffer_length = num_written; | |
560 | ||
561 | if (usbatm_submit_urb(urb)) | |
562 | break; | |
563 | urb = NULL; | |
564 | } | |
565 | } | |
566 | ||
567 | instance->current_skb = skb; | |
568 | } | |
569 | ||
570 | static void usbatm_cancel_send(struct usbatm_data *instance, | |
571 | struct atm_vcc *vcc) | |
572 | { | |
573 | struct sk_buff *skb, *n; | |
574 | ||
575 | atm_dbg(instance, "%s entered\n", __func__); | |
576 | spin_lock_irq(&instance->sndqueue.lock); | |
577 | for (skb = instance->sndqueue.next, n = skb->next; | |
578 | skb != (struct sk_buff *)&instance->sndqueue; | |
579 | skb = n, n = skb->next) | |
580 | if (UDSL_SKB(skb)->atm.vcc == vcc) { | |
581 | atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb); | |
582 | __skb_unlink(skb, &instance->sndqueue); | |
583 | usbatm_pop(vcc, skb); | |
584 | } | |
585 | spin_unlock_irq(&instance->sndqueue.lock); | |
586 | ||
587 | tasklet_disable(&instance->tx_channel.tasklet); | |
588 | if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) { | |
589 | atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb); | |
590 | instance->current_skb = NULL; | |
591 | usbatm_pop(vcc, skb); | |
592 | } | |
593 | tasklet_enable(&instance->tx_channel.tasklet); | |
594 | atm_dbg(instance, "%s done\n", __func__); | |
595 | } | |
596 | ||
597 | static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) | |
598 | { | |
599 | struct usbatm_data *instance = vcc->dev->dev_data; | |
600 | struct usbatm_control *ctrl = UDSL_SKB(skb); | |
601 | int err; | |
602 | ||
603 | vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len); | |
604 | ||
605 | if (!instance) { | |
606 | dbg("%s: NULL data!", __func__); | |
607 | err = -ENODEV; | |
608 | goto fail; | |
609 | } | |
610 | ||
611 | if (vcc->qos.aal != ATM_AAL5) { | |
0ec3c7e8 | 612 | atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); |
c59bba75 DS |
613 | err = -EINVAL; |
614 | goto fail; | |
615 | } | |
616 | ||
617 | if (skb->len > ATM_MAX_AAL5_PDU) { | |
0ec3c7e8 | 618 | atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n", |
c59bba75 DS |
619 | __func__, skb->len, ATM_MAX_AAL5_PDU); |
620 | err = -EINVAL; | |
621 | goto fail; | |
622 | } | |
623 | ||
624 | PACKETDEBUG(skb->data, skb->len); | |
625 | ||
626 | /* initialize the control block */ | |
627 | ctrl->atm.vcc = vcc; | |
628 | ctrl->len = skb->len; | |
629 | ctrl->crc = crc32_be(~0, skb->data, skb->len); | |
630 | ||
631 | skb_queue_tail(&instance->sndqueue, skb); | |
632 | tasklet_schedule(&instance->tx_channel.tasklet); | |
633 | ||
634 | return 0; | |
635 | ||
636 | fail: | |
637 | usbatm_pop(vcc, skb); | |
638 | return err; | |
639 | } | |
640 | ||
641 | ||
642 | /******************** | |
643 | ** bean counting ** | |
644 | ********************/ | |
645 | ||
646 | static void usbatm_destroy_instance(struct kref *kref) | |
647 | { | |
648 | struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount); | |
649 | ||
650 | dbg("%s", __func__); | |
651 | ||
652 | tasklet_kill(&instance->rx_channel.tasklet); | |
653 | tasklet_kill(&instance->tx_channel.tasklet); | |
654 | usb_put_dev(instance->usb_dev); | |
655 | kfree(instance); | |
656 | } | |
657 | ||
3d48586c | 658 | static void usbatm_get_instance(struct usbatm_data *instance) |
c59bba75 DS |
659 | { |
660 | dbg("%s", __func__); | |
661 | ||
662 | kref_get(&instance->refcount); | |
663 | } | |
664 | ||
3d48586c | 665 | static void usbatm_put_instance(struct usbatm_data *instance) |
c59bba75 DS |
666 | { |
667 | dbg("%s", __func__); | |
668 | ||
669 | kref_put(&instance->refcount, usbatm_destroy_instance); | |
670 | } | |
671 | ||
672 | ||
673 | /********** | |
674 | ** ATM ** | |
675 | **********/ | |
676 | ||
0ec3c7e8 | 677 | static void usbatm_atm_dev_close(struct atm_dev *atm_dev) |
c59bba75 | 678 | { |
0ec3c7e8 | 679 | struct usbatm_data *instance = atm_dev->dev_data; |
c59bba75 DS |
680 | |
681 | dbg("%s", __func__); | |
682 | ||
683 | if (!instance) | |
684 | return; | |
685 | ||
0ec3c7e8 | 686 | atm_dev->dev_data = NULL; /* catch bugs */ |
c59bba75 DS |
687 | usbatm_put_instance(instance); /* taken in usbatm_atm_init */ |
688 | } | |
689 | ||
690 | static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page) | |
691 | { | |
692 | struct usbatm_data *instance = atm_dev->dev_data; | |
693 | int left = *pos; | |
694 | ||
695 | if (!instance) { | |
696 | dbg("%s: NULL instance!", __func__); | |
697 | return -ENODEV; | |
698 | } | |
699 | ||
700 | if (!left--) | |
701 | return sprintf(page, "%s\n", instance->description); | |
702 | ||
703 | if (!left--) | |
704 | return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n", | |
705 | atm_dev->esi[0], atm_dev->esi[1], | |
706 | atm_dev->esi[2], atm_dev->esi[3], | |
707 | atm_dev->esi[4], atm_dev->esi[5]); | |
708 | ||
709 | if (!left--) | |
710 | return sprintf(page, | |
711 | "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n", | |
712 | atomic_read(&atm_dev->stats.aal5.tx), | |
713 | atomic_read(&atm_dev->stats.aal5.tx_err), | |
714 | atomic_read(&atm_dev->stats.aal5.rx), | |
715 | atomic_read(&atm_dev->stats.aal5.rx_err), | |
716 | atomic_read(&atm_dev->stats.aal5.rx_drop)); | |
717 | ||
718 | if (!left--) | |
719 | switch (atm_dev->signal) { | |
720 | case ATM_PHY_SIG_FOUND: | |
721 | return sprintf(page, "Line up\n"); | |
722 | case ATM_PHY_SIG_LOST: | |
723 | return sprintf(page, "Line down\n"); | |
724 | default: | |
725 | return sprintf(page, "Line state unknown\n"); | |
726 | } | |
727 | ||
728 | return 0; | |
729 | } | |
730 | ||
731 | static int usbatm_atm_open(struct atm_vcc *vcc) | |
732 | { | |
733 | struct usbatm_data *instance = vcc->dev->dev_data; | |
734 | struct usbatm_vcc_data *new = NULL; | |
735 | int ret; | |
736 | int vci = vcc->vci; | |
737 | short vpi = vcc->vpi; | |
738 | ||
739 | if (!instance) { | |
740 | dbg("%s: NULL data!", __func__); | |
741 | return -ENODEV; | |
742 | } | |
743 | ||
744 | atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci); | |
745 | ||
746 | /* only support AAL5 */ | |
0ec3c7e8 DS |
747 | if ((vcc->qos.aal != ATM_AAL5)) { |
748 | atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); | |
749 | return -EINVAL; | |
750 | } | |
751 | ||
752 | /* sanity checks */ | |
753 | if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) { | |
754 | atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu); | |
c59bba75 DS |
755 | return -EINVAL; |
756 | } | |
757 | ||
0ec3c7e8 | 758 | down(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */ |
c59bba75 DS |
759 | |
760 | if (usbatm_find_vcc(instance, vpi, vci)) { | |
761 | atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci); | |
762 | ret = -EADDRINUSE; | |
763 | goto fail; | |
764 | } | |
765 | ||
9a734efe | 766 | if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) { |
0ec3c7e8 | 767 | atm_err(instance, "%s: no memory for vcc_data!\n", __func__); |
c59bba75 DS |
768 | ret = -ENOMEM; |
769 | goto fail; | |
770 | } | |
771 | ||
c59bba75 DS |
772 | new->vcc = vcc; |
773 | new->vpi = vpi; | |
774 | new->vci = vci; | |
775 | ||
776 | new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL); | |
777 | if (!new->sarb) { | |
0ec3c7e8 | 778 | atm_err(instance, "%s: no memory for SAR buffer!\n", __func__); |
c59bba75 DS |
779 | ret = -ENOMEM; |
780 | goto fail; | |
781 | } | |
782 | ||
783 | vcc->dev_data = new; | |
784 | ||
785 | tasklet_disable(&instance->rx_channel.tasklet); | |
786 | list_add(&new->list, &instance->vcc_list); | |
787 | tasklet_enable(&instance->rx_channel.tasklet); | |
788 | ||
789 | set_bit(ATM_VF_ADDR, &vcc->flags); | |
790 | set_bit(ATM_VF_PARTIAL, &vcc->flags); | |
791 | set_bit(ATM_VF_READY, &vcc->flags); | |
792 | ||
793 | up(&instance->serialize); | |
794 | ||
795 | atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new); | |
796 | ||
797 | return 0; | |
798 | ||
799 | fail: | |
800 | kfree(new); | |
801 | up(&instance->serialize); | |
802 | return ret; | |
803 | } | |
804 | ||
805 | static void usbatm_atm_close(struct atm_vcc *vcc) | |
806 | { | |
807 | struct usbatm_data *instance = vcc->dev->dev_data; | |
808 | struct usbatm_vcc_data *vcc_data = vcc->dev_data; | |
809 | ||
810 | if (!instance || !vcc_data) { | |
811 | dbg("%s: NULL data!", __func__); | |
812 | return; | |
813 | } | |
814 | ||
815 | atm_dbg(instance, "%s entered\n", __func__); | |
816 | ||
817 | atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n", | |
818 | __func__, vcc_data, vcc_data->vpi, vcc_data->vci); | |
819 | ||
820 | usbatm_cancel_send(instance, vcc); | |
821 | ||
0ec3c7e8 | 822 | down(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */ |
c59bba75 DS |
823 | |
824 | tasklet_disable(&instance->rx_channel.tasklet); | |
825 | list_del(&vcc_data->list); | |
826 | tasklet_enable(&instance->rx_channel.tasklet); | |
827 | ||
828 | kfree_skb(vcc_data->sarb); | |
829 | vcc_data->sarb = NULL; | |
830 | ||
831 | kfree(vcc_data); | |
832 | vcc->dev_data = NULL; | |
833 | ||
834 | vcc->vpi = ATM_VPI_UNSPEC; | |
835 | vcc->vci = ATM_VCI_UNSPEC; | |
836 | clear_bit(ATM_VF_READY, &vcc->flags); | |
837 | clear_bit(ATM_VF_PARTIAL, &vcc->flags); | |
838 | clear_bit(ATM_VF_ADDR, &vcc->flags); | |
839 | ||
840 | up(&instance->serialize); | |
841 | ||
842 | atm_dbg(instance, "%s successful\n", __func__); | |
843 | } | |
844 | ||
0ec3c7e8 | 845 | static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, |
c59bba75 DS |
846 | void __user * arg) |
847 | { | |
848 | switch (cmd) { | |
849 | case ATM_QUERYLOOP: | |
850 | return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0; | |
851 | default: | |
852 | return -ENOIOCTLCMD; | |
853 | } | |
854 | } | |
855 | ||
856 | static int usbatm_atm_init(struct usbatm_data *instance) | |
857 | { | |
858 | struct atm_dev *atm_dev; | |
859 | int ret, i; | |
860 | ||
0ec3c7e8 DS |
861 | /* ATM init. The ATM initialization scheme suffers from an intrinsic race |
862 | * condition: callbacks we register can be executed at once, before we have | |
863 | * initialized the struct atm_dev. To protect against this, all callbacks | |
864 | * abort if atm_dev->dev_data is NULL. */ | |
c59bba75 DS |
865 | atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL); |
866 | if (!atm_dev) { | |
0ec3c7e8 | 867 | usb_err(instance, "%s: failed to register ATM device!\n", __func__); |
c59bba75 DS |
868 | return -1; |
869 | } | |
870 | ||
871 | instance->atm_dev = atm_dev; | |
872 | ||
873 | atm_dev->ci_range.vpi_bits = ATM_CI_MAX; | |
874 | atm_dev->ci_range.vci_bits = ATM_CI_MAX; | |
875 | atm_dev->signal = ATM_PHY_SIG_UNKNOWN; | |
876 | ||
877 | /* temp init ATM device, set to 128kbit */ | |
878 | atm_dev->link_rate = 128 * 1000 / 424; | |
879 | ||
880 | if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) { | |
0ec3c7e8 | 881 | atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret); |
c59bba75 DS |
882 | goto fail; |
883 | } | |
884 | ||
c59bba75 | 885 | usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */ |
0ec3c7e8 DS |
886 | |
887 | /* ready for ATM callbacks */ | |
c59bba75 DS |
888 | mb(); |
889 | atm_dev->dev_data = instance; | |
890 | ||
891 | /* submit all rx URBs */ | |
892 | for (i = 0; i < num_rcv_urbs; i++) | |
893 | usbatm_submit_urb(instance->urbs[i]); | |
894 | ||
895 | return 0; | |
896 | ||
897 | fail: | |
898 | instance->atm_dev = NULL; | |
64bf69dd | 899 | atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */ |
c59bba75 DS |
900 | return ret; |
901 | } | |
902 | ||
903 | ||
904 | /********** | |
905 | ** USB ** | |
906 | **********/ | |
907 | ||
908 | static int usbatm_do_heavy_init(void *arg) | |
909 | { | |
910 | struct usbatm_data *instance = arg; | |
911 | int ret; | |
912 | ||
913 | daemonize(instance->driver->driver_name); | |
914 | allow_signal(SIGTERM); | |
915 | ||
916 | complete(&instance->thread_started); | |
917 | ||
918 | ret = instance->driver->heavy_init(instance, instance->usb_intf); | |
919 | ||
920 | if (!ret) | |
921 | ret = usbatm_atm_init(instance); | |
922 | ||
923 | down(&instance->serialize); | |
924 | instance->thread_pid = -1; | |
925 | up(&instance->serialize); | |
926 | ||
927 | complete_and_exit(&instance->thread_exited, ret); | |
928 | } | |
929 | ||
930 | static int usbatm_heavy_init(struct usbatm_data *instance) | |
931 | { | |
932 | int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL); | |
933 | ||
934 | if (ret < 0) { | |
0ec3c7e8 | 935 | usb_err(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret); |
c59bba75 DS |
936 | return ret; |
937 | } | |
938 | ||
939 | down(&instance->serialize); | |
940 | instance->thread_pid = ret; | |
941 | up(&instance->serialize); | |
942 | ||
943 | wait_for_completion(&instance->thread_started); | |
944 | ||
945 | return 0; | |
946 | } | |
947 | ||
948 | static void usbatm_tasklet_schedule(unsigned long data) | |
949 | { | |
950 | tasklet_schedule((struct tasklet_struct *) data); | |
951 | } | |
952 | ||
953 | static inline void usbatm_init_channel(struct usbatm_channel *channel) | |
954 | { | |
955 | spin_lock_init(&channel->lock); | |
956 | INIT_LIST_HEAD(&channel->list); | |
957 | channel->delay.function = usbatm_tasklet_schedule; | |
958 | channel->delay.data = (unsigned long) &channel->tasklet; | |
959 | init_timer(&channel->delay); | |
960 | } | |
961 | ||
962 | int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, | |
963 | struct usbatm_driver *driver) | |
964 | { | |
965 | struct device *dev = &intf->dev; | |
966 | struct usb_device *usb_dev = interface_to_usbdev(intf); | |
967 | struct usbatm_data *instance; | |
968 | char *buf; | |
969 | int error = -ENOMEM; | |
970 | int i, length; | |
c59bba75 | 971 | |
0ec3c7e8 | 972 | dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n", |
c59bba75 DS |
973 | __func__, driver->driver_name, |
974 | le16_to_cpu(usb_dev->descriptor.idVendor), | |
975 | le16_to_cpu(usb_dev->descriptor.idProduct), | |
976 | intf->altsetting->desc.bInterfaceNumber); | |
977 | ||
978 | /* instance init */ | |
7b842b6e | 979 | instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL); |
c59bba75 | 980 | if (!instance) { |
0ec3c7e8 | 981 | dev_err(dev, "%s: no memory for instance data!\n", __func__); |
c59bba75 DS |
982 | return -ENOMEM; |
983 | } | |
984 | ||
c59bba75 DS |
985 | /* public fields */ |
986 | ||
987 | instance->driver = driver; | |
988 | snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name); | |
989 | ||
990 | instance->usb_dev = usb_dev; | |
991 | instance->usb_intf = intf; | |
992 | ||
993 | buf = instance->description; | |
994 | length = sizeof(instance->description); | |
995 | ||
996 | if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0) | |
997 | goto bind; | |
998 | ||
999 | buf += i; | |
1000 | length -= i; | |
1001 | ||
1002 | i = scnprintf(buf, length, " ("); | |
1003 | buf += i; | |
1004 | length -= i; | |
1005 | ||
1006 | if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0) | |
1007 | goto bind; | |
1008 | ||
1009 | buf += i; | |
1010 | length -= i; | |
1011 | ||
1012 | snprintf(buf, length, ")"); | |
1013 | ||
1014 | bind: | |
35644b0c | 1015 | if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) { |
0ec3c7e8 | 1016 | dev_err(dev, "%s: bind failed: %d!\n", __func__, error); |
c59bba75 DS |
1017 | goto fail_free; |
1018 | } | |
1019 | ||
1020 | /* private fields */ | |
1021 | ||
1022 | kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */ | |
1023 | init_MUTEX(&instance->serialize); | |
1024 | ||
1025 | instance->thread_pid = -1; | |
1026 | init_completion(&instance->thread_started); | |
1027 | init_completion(&instance->thread_exited); | |
1028 | ||
1029 | INIT_LIST_HEAD(&instance->vcc_list); | |
1030 | ||
1031 | usbatm_init_channel(&instance->rx_channel); | |
1032 | usbatm_init_channel(&instance->tx_channel); | |
1033 | tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance); | |
1034 | tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance); | |
1035 | instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->in); | |
1036 | instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->out); | |
1037 | instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding; | |
1038 | instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding; | |
1039 | instance->rx_channel.buf_size = rcv_buf_size * instance->rx_channel.stride; | |
1040 | instance->tx_channel.buf_size = snd_buf_size * instance->tx_channel.stride; | |
1041 | instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance; | |
1042 | ||
1043 | skb_queue_head_init(&instance->sndqueue); | |
1044 | ||
1045 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { | |
1046 | struct urb *urb; | |
1047 | u8 *buffer; | |
1048 | unsigned int iso_packets = 0, iso_size = 0; | |
1049 | struct usbatm_channel *channel = i < num_rcv_urbs ? | |
1050 | &instance->rx_channel : &instance->tx_channel; | |
1051 | ||
1052 | if (usb_pipeisoc(channel->endpoint)) { | |
1053 | /* don't expect iso out endpoints */ | |
1054 | iso_size = usb_maxpacket(instance->usb_dev, channel->endpoint, 0); | |
1055 | iso_size -= iso_size % channel->stride; /* alignment */ | |
1056 | BUG_ON(!iso_size); | |
1057 | iso_packets = (channel->buf_size - 1) / iso_size + 1; | |
1058 | } | |
1059 | ||
1060 | urb = usb_alloc_urb(iso_packets, GFP_KERNEL); | |
1061 | if (!urb) { | |
0ec3c7e8 | 1062 | dev_err(dev, "%s: no memory for urb %d!\n", __func__, i); |
c59bba75 DS |
1063 | goto fail_unbind; |
1064 | } | |
1065 | ||
65412e48 DS |
1066 | instance->urbs[i] = urb; |
1067 | ||
9a734efe DS |
1068 | /* zero the tx padding to avoid leaking information */ |
1069 | buffer = kzalloc(channel->buf_size, GFP_KERNEL); | |
c59bba75 | 1070 | if (!buffer) { |
0ec3c7e8 | 1071 | dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i); |
c59bba75 DS |
1072 | goto fail_unbind; |
1073 | } | |
c59bba75 DS |
1074 | |
1075 | usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint, | |
1076 | buffer, channel->buf_size, usbatm_complete, channel); | |
1077 | if (iso_packets) { | |
1078 | int j; | |
1079 | urb->interval = 1; | |
1080 | urb->transfer_flags = URB_ISO_ASAP; | |
1081 | urb->number_of_packets = iso_packets; | |
1082 | for (j = 0; j < iso_packets; j++) { | |
1083 | urb->iso_frame_desc[j].offset = iso_size * j; | |
1084 | urb->iso_frame_desc[j].length = min_t(int, iso_size, | |
1085 | channel->buf_size - urb->iso_frame_desc[j].offset); | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | /* put all tx URBs on the list of spares */ | |
1090 | if (i >= num_rcv_urbs) | |
1091 | list_add_tail(&urb->urb_list, &channel->list); | |
1092 | ||
1093 | vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p", | |
1094 | __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb); | |
c59bba75 DS |
1095 | } |
1096 | ||
35644b0c | 1097 | if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) { |
c59bba75 DS |
1098 | error = usbatm_heavy_init(instance); |
1099 | } else { | |
1100 | complete(&instance->thread_exited); /* pretend that heavy_init was run */ | |
1101 | error = usbatm_atm_init(instance); | |
1102 | } | |
1103 | ||
1104 | if (error < 0) | |
1105 | goto fail_unbind; | |
1106 | ||
1107 | usb_get_dev(usb_dev); | |
1108 | usb_set_intfdata(intf, instance); | |
1109 | ||
1110 | return 0; | |
1111 | ||
1112 | fail_unbind: | |
1113 | if (instance->driver->unbind) | |
1114 | instance->driver->unbind(instance, intf); | |
1115 | fail_free: | |
1116 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { | |
1117 | if (instance->urbs[i]) | |
1118 | kfree(instance->urbs[i]->transfer_buffer); | |
1119 | usb_free_urb(instance->urbs[i]); | |
1120 | } | |
1121 | ||
1122 | kfree (instance); | |
1123 | ||
1124 | return error; | |
1125 | } | |
1126 | EXPORT_SYMBOL_GPL(usbatm_usb_probe); | |
1127 | ||
1128 | void usbatm_usb_disconnect(struct usb_interface *intf) | |
1129 | { | |
1130 | struct device *dev = &intf->dev; | |
1131 | struct usbatm_data *instance = usb_get_intfdata(intf); | |
1132 | int i; | |
1133 | ||
1134 | dev_dbg(dev, "%s entered\n", __func__); | |
1135 | ||
1136 | if (!instance) { | |
1137 | dev_dbg(dev, "%s: NULL instance!\n", __func__); | |
1138 | return; | |
1139 | } | |
1140 | ||
1141 | usb_set_intfdata(intf, NULL); | |
1142 | ||
1143 | down(&instance->serialize); | |
1144 | if (instance->thread_pid >= 0) | |
1145 | kill_proc(instance->thread_pid, SIGTERM, 1); | |
1146 | up(&instance->serialize); | |
1147 | ||
1148 | wait_for_completion(&instance->thread_exited); | |
1149 | ||
1150 | tasklet_disable(&instance->rx_channel.tasklet); | |
1151 | tasklet_disable(&instance->tx_channel.tasklet); | |
1152 | ||
1153 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) | |
1154 | usb_kill_urb(instance->urbs[i]); | |
1155 | ||
1156 | del_timer_sync(&instance->rx_channel.delay); | |
1157 | del_timer_sync(&instance->tx_channel.delay); | |
1158 | ||
1159 | if (instance->atm_dev && instance->driver->atm_stop) | |
1160 | instance->driver->atm_stop(instance, instance->atm_dev); | |
1161 | ||
1162 | if (instance->driver->unbind) | |
1163 | instance->driver->unbind(instance, intf); | |
1164 | ||
1165 | instance->driver_data = NULL; | |
1166 | ||
1167 | /* turn usbatm_[rt]x_process into noop */ | |
1168 | /* no need to take the spinlock */ | |
1169 | INIT_LIST_HEAD(&instance->rx_channel.list); | |
1170 | INIT_LIST_HEAD(&instance->tx_channel.list); | |
1171 | ||
1172 | tasklet_enable(&instance->rx_channel.tasklet); | |
1173 | tasklet_enable(&instance->tx_channel.tasklet); | |
1174 | ||
1175 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { | |
1176 | kfree(instance->urbs[i]->transfer_buffer); | |
1177 | usb_free_urb(instance->urbs[i]); | |
1178 | } | |
1179 | ||
1180 | /* ATM finalize */ | |
1181 | if (instance->atm_dev) | |
64bf69dd | 1182 | atm_dev_deregister(instance->atm_dev); |
c59bba75 DS |
1183 | |
1184 | usbatm_put_instance(instance); /* taken in usbatm_usb_probe */ | |
1185 | } | |
1186 | EXPORT_SYMBOL_GPL(usbatm_usb_disconnect); | |
1187 | ||
1188 | ||
1189 | /*********** | |
1190 | ** init ** | |
1191 | ***********/ | |
1192 | ||
1193 | static int __init usbatm_usb_init(void) | |
1194 | { | |
1195 | dbg("%s: driver version %s", __func__, DRIVER_VERSION); | |
1196 | ||
1197 | if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) { | |
1198 | printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name); | |
1199 | return -EIO; | |
1200 | } | |
1201 | ||
1202 | if ((num_rcv_urbs > UDSL_MAX_RCV_URBS) | |
1203 | || (num_snd_urbs > UDSL_MAX_SND_URBS) | |
1204 | || (rcv_buf_size < 1) | |
1205 | || (rcv_buf_size > UDSL_MAX_RCV_BUF_SIZE) | |
1206 | || (snd_buf_size < 1) | |
1207 | || (snd_buf_size > UDSL_MAX_SND_BUF_SIZE)) | |
1208 | return -EINVAL; | |
1209 | ||
1210 | return 0; | |
1211 | } | |
1212 | module_init(usbatm_usb_init); | |
1213 | ||
1214 | static void __exit usbatm_usb_exit(void) | |
1215 | { | |
1216 | dbg("%s", __func__); | |
1217 | } | |
1218 | module_exit(usbatm_usb_exit); | |
1219 | ||
1220 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
1221 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1222 | MODULE_LICENSE("GPL"); | |
1223 | MODULE_VERSION(DRIVER_VERSION); | |
1224 | ||
1225 | /************ | |
1226 | ** debug ** | |
1227 | ************/ | |
1228 | ||
1229 | #ifdef VERBOSE_DEBUG | |
1230 | static int usbatm_print_packet(const unsigned char *data, int len) | |
1231 | { | |
1232 | unsigned char buffer[256]; | |
1233 | int i = 0, j = 0; | |
1234 | ||
1235 | for (i = 0; i < len;) { | |
1236 | buffer[0] = '\0'; | |
1237 | sprintf(buffer, "%.3d :", i); | |
1238 | for (j = 0; (j < 16) && (i < len); j++, i++) { | |
1239 | sprintf(buffer, "%s %2.2x", buffer, data[i]); | |
1240 | } | |
1241 | dbg("%s", buffer); | |
1242 | } | |
1243 | return i; | |
1244 | } | |
1245 | #endif |