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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> | |
227d7761 | 75 | #include <linux/netdevice.h> |
c59bba75 DS |
76 | #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 | |
86 | static 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>" | |
95 | #define DRIVER_VERSION "1.9" | |
96 | #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION | |
97 | ||
98 | static const char usbatm_driver_name[] = "usbatm"; | |
99 | ||
100 | #define UDSL_MAX_RCV_URBS 16 | |
101 | #define UDSL_MAX_SND_URBS 16 | |
6f749475 | 102 | #define UDSL_MAX_BUF_SIZE 64 * 1024 /* bytes */ |
c59bba75 DS |
103 | #define UDSL_DEFAULT_RCV_URBS 4 |
104 | #define UDSL_DEFAULT_SND_URBS 4 | |
6f749475 DS |
105 | #define UDSL_DEFAULT_RCV_BUF_SIZE 64 * ATM_CELL_SIZE /* bytes */ |
106 | #define UDSL_DEFAULT_SND_BUF_SIZE 64 * ATM_CELL_SIZE /* bytes */ | |
c59bba75 DS |
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; | |
6f749475 DS |
114 | static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE; |
115 | static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE; | |
c59bba75 DS |
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 | ||
6f749475 DS |
129 | module_param(rcv_buf_bytes, uint, S_IRUGO); |
130 | MODULE_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: " | |
c59bba75 DS |
133 | __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")"); |
134 | ||
6f749475 DS |
135 | module_param(snd_buf_bytes, uint, S_IRUGO); |
136 | MODULE_PARM_DESC(snd_buf_bytes, | |
137 | "Size of the buffers used for transmission, in bytes (range: 1-" | |
c59bba75 DS |
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 | |
227d7761 | 202 | dev_kfree_skb_any(skb); |
c59bba75 DS |
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); | |
227d7761 | 400 | dev_kfree_skb_any(skb); |
c59bba75 DS |
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; | |
6f749475 | 432 | unsigned int bytes_written; |
c59bba75 DS |
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 | ||
6f749475 DS |
438 | for (bytes_written = 0; bytes_written < avail_space && ctrl->len; |
439 | bytes_written += stride, target += stride) { | |
c59bba75 DS |
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 | ||
6f749475 | 482 | return bytes_written; |
c59bba75 DS |
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; | |
6f749475 | 526 | unsigned int bytes_written = 0; |
c59bba75 DS |
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; | |
6f749475 | 538 | bytes_written = (urb->status == -EAGAIN) ? |
c59bba75 DS |
539 | urb->transfer_buffer_length : 0; |
540 | } | |
541 | ||
6f749475 DS |
542 | bytes_written += usbatm_write_cells(instance, skb, |
543 | buffer + bytes_written, | |
544 | buf_size - bytes_written); | |
c59bba75 DS |
545 | |
546 | vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p", | |
6f749475 | 547 | __func__, bytes_written, skb, urb); |
c59bba75 DS |
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 | ||
6f749475 DS |
558 | if (bytes_written == buf_size || (!skb && bytes_written)) { |
559 | urb->transfer_buffer_length = bytes_written; | |
c59bba75 DS |
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 | ||
0e42a627 DS |
605 | /* racy disconnection check - fine */ |
606 | if (!instance || instance->disconnected) { | |
607 | #ifdef DEBUG | |
608 | if (printk_ratelimit()) | |
609 | printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance"); | |
610 | #endif | |
c59bba75 DS |
611 | err = -ENODEV; |
612 | goto fail; | |
613 | } | |
614 | ||
615 | if (vcc->qos.aal != ATM_AAL5) { | |
0ec3c7e8 | 616 | atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); |
c59bba75 DS |
617 | err = -EINVAL; |
618 | goto fail; | |
619 | } | |
620 | ||
621 | if (skb->len > ATM_MAX_AAL5_PDU) { | |
0ec3c7e8 | 622 | atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n", |
c59bba75 DS |
623 | __func__, skb->len, ATM_MAX_AAL5_PDU); |
624 | err = -EINVAL; | |
625 | goto fail; | |
626 | } | |
627 | ||
628 | PACKETDEBUG(skb->data, skb->len); | |
629 | ||
630 | /* initialize the control block */ | |
631 | ctrl->atm.vcc = vcc; | |
632 | ctrl->len = skb->len; | |
633 | ctrl->crc = crc32_be(~0, skb->data, skb->len); | |
634 | ||
635 | skb_queue_tail(&instance->sndqueue, skb); | |
636 | tasklet_schedule(&instance->tx_channel.tasklet); | |
637 | ||
638 | return 0; | |
639 | ||
640 | fail: | |
641 | usbatm_pop(vcc, skb); | |
642 | return err; | |
643 | } | |
644 | ||
645 | ||
646 | /******************** | |
647 | ** bean counting ** | |
648 | ********************/ | |
649 | ||
650 | static void usbatm_destroy_instance(struct kref *kref) | |
651 | { | |
652 | struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount); | |
653 | ||
654 | dbg("%s", __func__); | |
655 | ||
656 | tasklet_kill(&instance->rx_channel.tasklet); | |
657 | tasklet_kill(&instance->tx_channel.tasklet); | |
658 | usb_put_dev(instance->usb_dev); | |
659 | kfree(instance); | |
660 | } | |
661 | ||
3d48586c | 662 | static void usbatm_get_instance(struct usbatm_data *instance) |
c59bba75 DS |
663 | { |
664 | dbg("%s", __func__); | |
665 | ||
666 | kref_get(&instance->refcount); | |
667 | } | |
668 | ||
3d48586c | 669 | static void usbatm_put_instance(struct usbatm_data *instance) |
c59bba75 DS |
670 | { |
671 | dbg("%s", __func__); | |
672 | ||
673 | kref_put(&instance->refcount, usbatm_destroy_instance); | |
674 | } | |
675 | ||
676 | ||
677 | /********** | |
678 | ** ATM ** | |
679 | **********/ | |
680 | ||
0ec3c7e8 | 681 | static void usbatm_atm_dev_close(struct atm_dev *atm_dev) |
c59bba75 | 682 | { |
0ec3c7e8 | 683 | struct usbatm_data *instance = atm_dev->dev_data; |
c59bba75 DS |
684 | |
685 | dbg("%s", __func__); | |
686 | ||
687 | if (!instance) | |
688 | return; | |
689 | ||
0ec3c7e8 | 690 | atm_dev->dev_data = NULL; /* catch bugs */ |
c59bba75 DS |
691 | usbatm_put_instance(instance); /* taken in usbatm_atm_init */ |
692 | } | |
693 | ||
694 | static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page) | |
695 | { | |
696 | struct usbatm_data *instance = atm_dev->dev_data; | |
697 | int left = *pos; | |
698 | ||
699 | if (!instance) { | |
700 | dbg("%s: NULL instance!", __func__); | |
701 | return -ENODEV; | |
702 | } | |
703 | ||
704 | if (!left--) | |
705 | return sprintf(page, "%s\n", instance->description); | |
706 | ||
707 | if (!left--) | |
708 | return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n", | |
709 | atm_dev->esi[0], atm_dev->esi[1], | |
710 | atm_dev->esi[2], atm_dev->esi[3], | |
711 | atm_dev->esi[4], atm_dev->esi[5]); | |
712 | ||
713 | if (!left--) | |
714 | return sprintf(page, | |
715 | "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n", | |
716 | atomic_read(&atm_dev->stats.aal5.tx), | |
717 | atomic_read(&atm_dev->stats.aal5.tx_err), | |
718 | atomic_read(&atm_dev->stats.aal5.rx), | |
719 | atomic_read(&atm_dev->stats.aal5.rx_err), | |
720 | atomic_read(&atm_dev->stats.aal5.rx_drop)); | |
721 | ||
0e42a627 DS |
722 | if (!left--) { |
723 | if (instance->disconnected) | |
724 | return sprintf(page, "Disconnected\n"); | |
725 | else | |
726 | switch (atm_dev->signal) { | |
727 | case ATM_PHY_SIG_FOUND: | |
728 | return sprintf(page, "Line up\n"); | |
729 | case ATM_PHY_SIG_LOST: | |
730 | return sprintf(page, "Line down\n"); | |
731 | default: | |
732 | return sprintf(page, "Line state unknown\n"); | |
733 | } | |
734 | } | |
c59bba75 DS |
735 | |
736 | return 0; | |
737 | } | |
738 | ||
739 | static int usbatm_atm_open(struct atm_vcc *vcc) | |
740 | { | |
741 | struct usbatm_data *instance = vcc->dev->dev_data; | |
742 | struct usbatm_vcc_data *new = NULL; | |
743 | int ret; | |
744 | int vci = vcc->vci; | |
745 | short vpi = vcc->vpi; | |
746 | ||
747 | if (!instance) { | |
748 | dbg("%s: NULL data!", __func__); | |
749 | return -ENODEV; | |
750 | } | |
751 | ||
752 | atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci); | |
753 | ||
754 | /* only support AAL5 */ | |
0ec3c7e8 DS |
755 | if ((vcc->qos.aal != ATM_AAL5)) { |
756 | atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); | |
757 | return -EINVAL; | |
758 | } | |
759 | ||
760 | /* sanity checks */ | |
761 | if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) { | |
762 | atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu); | |
c59bba75 DS |
763 | return -EINVAL; |
764 | } | |
765 | ||
0ec3c7e8 | 766 | down(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */ |
c59bba75 | 767 | |
0e42a627 DS |
768 | if (instance->disconnected) { |
769 | atm_dbg(instance, "%s: disconnected!\n", __func__); | |
770 | ret = -ENODEV; | |
771 | goto fail; | |
772 | } | |
773 | ||
c59bba75 DS |
774 | if (usbatm_find_vcc(instance, vpi, vci)) { |
775 | atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci); | |
776 | ret = -EADDRINUSE; | |
777 | goto fail; | |
778 | } | |
779 | ||
9a734efe | 780 | if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) { |
0ec3c7e8 | 781 | atm_err(instance, "%s: no memory for vcc_data!\n", __func__); |
c59bba75 DS |
782 | ret = -ENOMEM; |
783 | goto fail; | |
784 | } | |
785 | ||
c59bba75 DS |
786 | new->vcc = vcc; |
787 | new->vpi = vpi; | |
788 | new->vci = vci; | |
789 | ||
790 | new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL); | |
791 | if (!new->sarb) { | |
0ec3c7e8 | 792 | atm_err(instance, "%s: no memory for SAR buffer!\n", __func__); |
c59bba75 DS |
793 | ret = -ENOMEM; |
794 | goto fail; | |
795 | } | |
796 | ||
797 | vcc->dev_data = new; | |
798 | ||
799 | tasklet_disable(&instance->rx_channel.tasklet); | |
800 | list_add(&new->list, &instance->vcc_list); | |
801 | tasklet_enable(&instance->rx_channel.tasklet); | |
802 | ||
803 | set_bit(ATM_VF_ADDR, &vcc->flags); | |
804 | set_bit(ATM_VF_PARTIAL, &vcc->flags); | |
805 | set_bit(ATM_VF_READY, &vcc->flags); | |
806 | ||
807 | up(&instance->serialize); | |
808 | ||
809 | atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new); | |
810 | ||
811 | return 0; | |
812 | ||
813 | fail: | |
814 | kfree(new); | |
815 | up(&instance->serialize); | |
816 | return ret; | |
817 | } | |
818 | ||
819 | static void usbatm_atm_close(struct atm_vcc *vcc) | |
820 | { | |
821 | struct usbatm_data *instance = vcc->dev->dev_data; | |
822 | struct usbatm_vcc_data *vcc_data = vcc->dev_data; | |
823 | ||
824 | if (!instance || !vcc_data) { | |
825 | dbg("%s: NULL data!", __func__); | |
826 | return; | |
827 | } | |
828 | ||
829 | atm_dbg(instance, "%s entered\n", __func__); | |
830 | ||
831 | atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n", | |
832 | __func__, vcc_data, vcc_data->vpi, vcc_data->vci); | |
833 | ||
834 | usbatm_cancel_send(instance, vcc); | |
835 | ||
0ec3c7e8 | 836 | down(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */ |
c59bba75 DS |
837 | |
838 | tasklet_disable(&instance->rx_channel.tasklet); | |
839 | list_del(&vcc_data->list); | |
840 | tasklet_enable(&instance->rx_channel.tasklet); | |
841 | ||
842 | kfree_skb(vcc_data->sarb); | |
843 | vcc_data->sarb = NULL; | |
844 | ||
845 | kfree(vcc_data); | |
846 | vcc->dev_data = NULL; | |
847 | ||
848 | vcc->vpi = ATM_VPI_UNSPEC; | |
849 | vcc->vci = ATM_VCI_UNSPEC; | |
850 | clear_bit(ATM_VF_READY, &vcc->flags); | |
851 | clear_bit(ATM_VF_PARTIAL, &vcc->flags); | |
852 | clear_bit(ATM_VF_ADDR, &vcc->flags); | |
853 | ||
854 | up(&instance->serialize); | |
855 | ||
856 | atm_dbg(instance, "%s successful\n", __func__); | |
857 | } | |
858 | ||
0ec3c7e8 | 859 | static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, |
c59bba75 DS |
860 | void __user * arg) |
861 | { | |
0e42a627 DS |
862 | struct usbatm_data *instance = atm_dev->dev_data; |
863 | ||
864 | if (!instance || instance->disconnected) { | |
865 | dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance"); | |
866 | return -ENODEV; | |
867 | } | |
868 | ||
c59bba75 DS |
869 | switch (cmd) { |
870 | case ATM_QUERYLOOP: | |
871 | return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0; | |
872 | default: | |
873 | return -ENOIOCTLCMD; | |
874 | } | |
875 | } | |
876 | ||
877 | static int usbatm_atm_init(struct usbatm_data *instance) | |
878 | { | |
879 | struct atm_dev *atm_dev; | |
880 | int ret, i; | |
881 | ||
0ec3c7e8 DS |
882 | /* ATM init. The ATM initialization scheme suffers from an intrinsic race |
883 | * condition: callbacks we register can be executed at once, before we have | |
884 | * initialized the struct atm_dev. To protect against this, all callbacks | |
885 | * abort if atm_dev->dev_data is NULL. */ | |
c59bba75 DS |
886 | atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL); |
887 | if (!atm_dev) { | |
0ec3c7e8 | 888 | usb_err(instance, "%s: failed to register ATM device!\n", __func__); |
c59bba75 DS |
889 | return -1; |
890 | } | |
891 | ||
892 | instance->atm_dev = atm_dev; | |
893 | ||
894 | atm_dev->ci_range.vpi_bits = ATM_CI_MAX; | |
895 | atm_dev->ci_range.vci_bits = ATM_CI_MAX; | |
896 | atm_dev->signal = ATM_PHY_SIG_UNKNOWN; | |
897 | ||
898 | /* temp init ATM device, set to 128kbit */ | |
899 | atm_dev->link_rate = 128 * 1000 / 424; | |
900 | ||
901 | if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) { | |
0ec3c7e8 | 902 | atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret); |
c59bba75 DS |
903 | goto fail; |
904 | } | |
905 | ||
c59bba75 | 906 | usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */ |
0ec3c7e8 DS |
907 | |
908 | /* ready for ATM callbacks */ | |
c59bba75 DS |
909 | mb(); |
910 | atm_dev->dev_data = instance; | |
911 | ||
912 | /* submit all rx URBs */ | |
913 | for (i = 0; i < num_rcv_urbs; i++) | |
914 | usbatm_submit_urb(instance->urbs[i]); | |
915 | ||
916 | return 0; | |
917 | ||
918 | fail: | |
919 | instance->atm_dev = NULL; | |
64bf69dd | 920 | atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */ |
c59bba75 DS |
921 | return ret; |
922 | } | |
923 | ||
924 | ||
925 | /********** | |
926 | ** USB ** | |
927 | **********/ | |
928 | ||
929 | static int usbatm_do_heavy_init(void *arg) | |
930 | { | |
931 | struct usbatm_data *instance = arg; | |
932 | int ret; | |
933 | ||
934 | daemonize(instance->driver->driver_name); | |
935 | allow_signal(SIGTERM); | |
936 | ||
937 | complete(&instance->thread_started); | |
938 | ||
939 | ret = instance->driver->heavy_init(instance, instance->usb_intf); | |
940 | ||
941 | if (!ret) | |
942 | ret = usbatm_atm_init(instance); | |
943 | ||
944 | down(&instance->serialize); | |
945 | instance->thread_pid = -1; | |
946 | up(&instance->serialize); | |
947 | ||
948 | complete_and_exit(&instance->thread_exited, ret); | |
949 | } | |
950 | ||
951 | static int usbatm_heavy_init(struct usbatm_data *instance) | |
952 | { | |
953 | int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL); | |
954 | ||
955 | if (ret < 0) { | |
0ec3c7e8 | 956 | usb_err(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret); |
c59bba75 DS |
957 | return ret; |
958 | } | |
959 | ||
960 | down(&instance->serialize); | |
961 | instance->thread_pid = ret; | |
962 | up(&instance->serialize); | |
963 | ||
964 | wait_for_completion(&instance->thread_started); | |
965 | ||
966 | return 0; | |
967 | } | |
968 | ||
969 | static void usbatm_tasklet_schedule(unsigned long data) | |
970 | { | |
971 | tasklet_schedule((struct tasklet_struct *) data); | |
972 | } | |
973 | ||
974 | static inline void usbatm_init_channel(struct usbatm_channel *channel) | |
975 | { | |
976 | spin_lock_init(&channel->lock); | |
977 | INIT_LIST_HEAD(&channel->list); | |
978 | channel->delay.function = usbatm_tasklet_schedule; | |
979 | channel->delay.data = (unsigned long) &channel->tasklet; | |
980 | init_timer(&channel->delay); | |
981 | } | |
982 | ||
983 | int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, | |
984 | struct usbatm_driver *driver) | |
985 | { | |
986 | struct device *dev = &intf->dev; | |
987 | struct usb_device *usb_dev = interface_to_usbdev(intf); | |
988 | struct usbatm_data *instance; | |
989 | char *buf; | |
990 | int error = -ENOMEM; | |
991 | int i, length; | |
6f749475 | 992 | unsigned int maxpacket, num_packets; |
c59bba75 | 993 | |
0ec3c7e8 | 994 | dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n", |
c59bba75 DS |
995 | __func__, driver->driver_name, |
996 | le16_to_cpu(usb_dev->descriptor.idVendor), | |
997 | le16_to_cpu(usb_dev->descriptor.idProduct), | |
998 | intf->altsetting->desc.bInterfaceNumber); | |
999 | ||
1000 | /* instance init */ | |
7b842b6e | 1001 | instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL); |
c59bba75 | 1002 | if (!instance) { |
0ec3c7e8 | 1003 | dev_err(dev, "%s: no memory for instance data!\n", __func__); |
c59bba75 DS |
1004 | return -ENOMEM; |
1005 | } | |
1006 | ||
c59bba75 DS |
1007 | /* public fields */ |
1008 | ||
1009 | instance->driver = driver; | |
1010 | snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name); | |
1011 | ||
1012 | instance->usb_dev = usb_dev; | |
1013 | instance->usb_intf = intf; | |
1014 | ||
1015 | buf = instance->description; | |
1016 | length = sizeof(instance->description); | |
1017 | ||
1018 | if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0) | |
1019 | goto bind; | |
1020 | ||
1021 | buf += i; | |
1022 | length -= i; | |
1023 | ||
1024 | i = scnprintf(buf, length, " ("); | |
1025 | buf += i; | |
1026 | length -= i; | |
1027 | ||
1028 | if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0) | |
1029 | goto bind; | |
1030 | ||
1031 | buf += i; | |
1032 | length -= i; | |
1033 | ||
1034 | snprintf(buf, length, ")"); | |
1035 | ||
1036 | bind: | |
35644b0c | 1037 | if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) { |
0ec3c7e8 | 1038 | dev_err(dev, "%s: bind failed: %d!\n", __func__, error); |
c59bba75 DS |
1039 | goto fail_free; |
1040 | } | |
1041 | ||
1042 | /* private fields */ | |
1043 | ||
1044 | kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */ | |
1045 | init_MUTEX(&instance->serialize); | |
1046 | ||
1047 | instance->thread_pid = -1; | |
1048 | init_completion(&instance->thread_started); | |
1049 | init_completion(&instance->thread_exited); | |
1050 | ||
1051 | INIT_LIST_HEAD(&instance->vcc_list); | |
80aae7a1 | 1052 | skb_queue_head_init(&instance->sndqueue); |
c59bba75 DS |
1053 | |
1054 | usbatm_init_channel(&instance->rx_channel); | |
1055 | usbatm_init_channel(&instance->tx_channel); | |
1056 | tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance); | |
1057 | tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance); | |
c59bba75 DS |
1058 | instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding; |
1059 | instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding; | |
c59bba75 DS |
1060 | instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance; |
1061 | ||
80aae7a1 DS |
1062 | if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in) |
1063 | instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in); | |
1064 | else | |
1065 | instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in); | |
1066 | ||
1067 | instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out); | |
1068 | ||
6f749475 DS |
1069 | /* tx buffer size must be a positive multiple of the stride */ |
1070 | instance->tx_channel.buf_size = max (instance->tx_channel.stride, | |
1071 | snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride)); | |
1072 | ||
1073 | /* rx buffer size must be a positive multiple of the endpoint maxpacket */ | |
1074 | maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0); | |
1075 | ||
1076 | if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) { | |
1077 | dev_err(dev, "%s: invalid endpoint %02x!\n", __func__, | |
1078 | usb_pipeendpoint(instance->rx_channel.endpoint)); | |
1079 | error = -EINVAL; | |
1080 | goto fail_unbind; | |
1081 | } | |
1082 | ||
1083 | num_packets = max (1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */ | |
1084 | ||
1085 | if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE) | |
1086 | num_packets--; | |
1087 | ||
1088 | instance->rx_channel.buf_size = num_packets * maxpacket; | |
80aae7a1 | 1089 | instance->rx_channel.packet_size = maxpacket; |
6f749475 DS |
1090 | |
1091 | #ifdef DEBUG | |
1092 | for (i = 0; i < 2; i++) { | |
1093 | struct usbatm_channel *channel = i ? | |
1094 | &instance->tx_channel : &instance->rx_channel; | |
1095 | ||
1096 | dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel); | |
1097 | } | |
1098 | #endif | |
1099 | ||
80aae7a1 | 1100 | /* initialize urbs */ |
c59bba75 DS |
1101 | |
1102 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { | |
c59bba75 | 1103 | u8 *buffer; |
c59bba75 DS |
1104 | struct usbatm_channel *channel = i < num_rcv_urbs ? |
1105 | &instance->rx_channel : &instance->tx_channel; | |
80aae7a1 DS |
1106 | struct urb *urb; |
1107 | unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0; | |
c59bba75 | 1108 | |
80aae7a1 | 1109 | UDSL_ASSERT(!usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint)); |
c59bba75 DS |
1110 | |
1111 | urb = usb_alloc_urb(iso_packets, GFP_KERNEL); | |
1112 | if (!urb) { | |
0ec3c7e8 | 1113 | dev_err(dev, "%s: no memory for urb %d!\n", __func__, i); |
72ef8ab4 | 1114 | error = -ENOMEM; |
c59bba75 DS |
1115 | goto fail_unbind; |
1116 | } | |
1117 | ||
65412e48 DS |
1118 | instance->urbs[i] = urb; |
1119 | ||
9a734efe DS |
1120 | /* zero the tx padding to avoid leaking information */ |
1121 | buffer = kzalloc(channel->buf_size, GFP_KERNEL); | |
c59bba75 | 1122 | if (!buffer) { |
0ec3c7e8 | 1123 | dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i); |
72ef8ab4 | 1124 | error = -ENOMEM; |
c59bba75 DS |
1125 | goto fail_unbind; |
1126 | } | |
c59bba75 DS |
1127 | |
1128 | usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint, | |
1129 | buffer, channel->buf_size, usbatm_complete, channel); | |
1130 | if (iso_packets) { | |
1131 | int j; | |
1132 | urb->interval = 1; | |
1133 | urb->transfer_flags = URB_ISO_ASAP; | |
1134 | urb->number_of_packets = iso_packets; | |
1135 | for (j = 0; j < iso_packets; j++) { | |
80aae7a1 DS |
1136 | urb->iso_frame_desc[j].offset = channel->packet_size * j; |
1137 | urb->iso_frame_desc[j].length = channel->packet_size; | |
c59bba75 DS |
1138 | } |
1139 | } | |
1140 | ||
1141 | /* put all tx URBs on the list of spares */ | |
1142 | if (i >= num_rcv_urbs) | |
1143 | list_add_tail(&urb->urb_list, &channel->list); | |
1144 | ||
1145 | vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p", | |
1146 | __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb); | |
c59bba75 DS |
1147 | } |
1148 | ||
35644b0c | 1149 | if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) { |
c59bba75 DS |
1150 | error = usbatm_heavy_init(instance); |
1151 | } else { | |
1152 | complete(&instance->thread_exited); /* pretend that heavy_init was run */ | |
1153 | error = usbatm_atm_init(instance); | |
1154 | } | |
1155 | ||
1156 | if (error < 0) | |
1157 | goto fail_unbind; | |
1158 | ||
1159 | usb_get_dev(usb_dev); | |
1160 | usb_set_intfdata(intf, instance); | |
1161 | ||
1162 | return 0; | |
1163 | ||
1164 | fail_unbind: | |
1165 | if (instance->driver->unbind) | |
1166 | instance->driver->unbind(instance, intf); | |
1167 | fail_free: | |
1168 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { | |
1169 | if (instance->urbs[i]) | |
1170 | kfree(instance->urbs[i]->transfer_buffer); | |
1171 | usb_free_urb(instance->urbs[i]); | |
1172 | } | |
1173 | ||
1174 | kfree (instance); | |
1175 | ||
1176 | return error; | |
1177 | } | |
1178 | EXPORT_SYMBOL_GPL(usbatm_usb_probe); | |
1179 | ||
1180 | void usbatm_usb_disconnect(struct usb_interface *intf) | |
1181 | { | |
1182 | struct device *dev = &intf->dev; | |
1183 | struct usbatm_data *instance = usb_get_intfdata(intf); | |
0e42a627 | 1184 | struct usbatm_vcc_data *vcc_data; |
c59bba75 DS |
1185 | int i; |
1186 | ||
1187 | dev_dbg(dev, "%s entered\n", __func__); | |
1188 | ||
1189 | if (!instance) { | |
1190 | dev_dbg(dev, "%s: NULL instance!\n", __func__); | |
1191 | return; | |
1192 | } | |
1193 | ||
1194 | usb_set_intfdata(intf, NULL); | |
1195 | ||
1196 | down(&instance->serialize); | |
0e42a627 | 1197 | instance->disconnected = 1; |
c59bba75 DS |
1198 | if (instance->thread_pid >= 0) |
1199 | kill_proc(instance->thread_pid, SIGTERM, 1); | |
1200 | up(&instance->serialize); | |
1201 | ||
1202 | wait_for_completion(&instance->thread_exited); | |
1203 | ||
0e42a627 DS |
1204 | down(&instance->serialize); |
1205 | list_for_each_entry(vcc_data, &instance->vcc_list, list) | |
1206 | vcc_release_async(vcc_data->vcc, -EPIPE); | |
1207 | up(&instance->serialize); | |
1208 | ||
c59bba75 DS |
1209 | tasklet_disable(&instance->rx_channel.tasklet); |
1210 | tasklet_disable(&instance->tx_channel.tasklet); | |
1211 | ||
1212 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) | |
1213 | usb_kill_urb(instance->urbs[i]); | |
1214 | ||
1215 | del_timer_sync(&instance->rx_channel.delay); | |
1216 | del_timer_sync(&instance->tx_channel.delay); | |
1217 | ||
0e42a627 DS |
1218 | /* turn usbatm_[rt]x_process into something close to a no-op */ |
1219 | /* no need to take the spinlock */ | |
1220 | INIT_LIST_HEAD(&instance->rx_channel.list); | |
1221 | INIT_LIST_HEAD(&instance->tx_channel.list); | |
1222 | ||
1223 | tasklet_enable(&instance->rx_channel.tasklet); | |
1224 | tasklet_enable(&instance->tx_channel.tasklet); | |
1225 | ||
c59bba75 DS |
1226 | if (instance->atm_dev && instance->driver->atm_stop) |
1227 | instance->driver->atm_stop(instance, instance->atm_dev); | |
1228 | ||
1229 | if (instance->driver->unbind) | |
1230 | instance->driver->unbind(instance, intf); | |
1231 | ||
1232 | instance->driver_data = NULL; | |
1233 | ||
c59bba75 DS |
1234 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { |
1235 | kfree(instance->urbs[i]->transfer_buffer); | |
1236 | usb_free_urb(instance->urbs[i]); | |
1237 | } | |
1238 | ||
1239 | /* ATM finalize */ | |
1240 | if (instance->atm_dev) | |
64bf69dd | 1241 | atm_dev_deregister(instance->atm_dev); |
c59bba75 DS |
1242 | |
1243 | usbatm_put_instance(instance); /* taken in usbatm_usb_probe */ | |
1244 | } | |
1245 | EXPORT_SYMBOL_GPL(usbatm_usb_disconnect); | |
1246 | ||
1247 | ||
1248 | /*********** | |
1249 | ** init ** | |
1250 | ***********/ | |
1251 | ||
1252 | static int __init usbatm_usb_init(void) | |
1253 | { | |
1254 | dbg("%s: driver version %s", __func__, DRIVER_VERSION); | |
1255 | ||
1256 | if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) { | |
1257 | printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name); | |
1258 | return -EIO; | |
1259 | } | |
1260 | ||
1261 | if ((num_rcv_urbs > UDSL_MAX_RCV_URBS) | |
1262 | || (num_snd_urbs > UDSL_MAX_SND_URBS) | |
6f749475 DS |
1263 | || (rcv_buf_bytes < 1) |
1264 | || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE) | |
1265 | || (snd_buf_bytes < 1) | |
1266 | || (snd_buf_bytes > UDSL_MAX_BUF_SIZE)) | |
c59bba75 DS |
1267 | return -EINVAL; |
1268 | ||
1269 | return 0; | |
1270 | } | |
1271 | module_init(usbatm_usb_init); | |
1272 | ||
1273 | static void __exit usbatm_usb_exit(void) | |
1274 | { | |
1275 | dbg("%s", __func__); | |
1276 | } | |
1277 | module_exit(usbatm_usb_exit); | |
1278 | ||
1279 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
1280 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1281 | MODULE_LICENSE("GPL"); | |
1282 | MODULE_VERSION(DRIVER_VERSION); | |
1283 | ||
1284 | /************ | |
1285 | ** debug ** | |
1286 | ************/ | |
1287 | ||
1288 | #ifdef VERBOSE_DEBUG | |
1289 | static int usbatm_print_packet(const unsigned char *data, int len) | |
1290 | { | |
1291 | unsigned char buffer[256]; | |
1292 | int i = 0, j = 0; | |
1293 | ||
1294 | for (i = 0; i < len;) { | |
1295 | buffer[0] = '\0'; | |
1296 | sprintf(buffer, "%.3d :", i); | |
1297 | for (j = 0; (j < 16) && (i < len); j++, i++) { | |
1298 | sprintf(buffer, "%s %2.2x", buffer, data[i]); | |
1299 | } | |
1300 | dbg("%s", buffer); | |
1301 | } | |
1302 | return i; | |
1303 | } | |
1304 | #endif |