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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> | |
c59bba75 DS |
80 | #include <linux/stat.h> |
81 | #include <linux/timer.h> | |
82 | #include <linux/wait.h> | |
c4504a7e | 83 | #include <linux/kthread.h> |
c59bba75 DS |
84 | |
85 | #ifdef VERBOSE_DEBUG | |
86 | static int usbatm_print_packet(const unsigned char *data, int len); | |
9196cc7b NK |
87 | #define PACKETDEBUG(arg...) usbatm_print_packet(arg) |
88 | #define vdbg(arg...) dbg(arg) | |
c59bba75 DS |
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>" | |
9b0e54ad | 95 | #define DRIVER_VERSION "1.10" |
c59bba75 DS |
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 | |
6275cdfa | 102 | #define UDSL_MAX_BUF_SIZE 65536 |
c59bba75 DS |
103 | #define UDSL_DEFAULT_RCV_URBS 4 |
104 | #define UDSL_DEFAULT_SND_URBS 4 | |
6275cdfa DS |
105 | #define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ |
106 | #define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ | |
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-" | |
6275cdfa | 138 | __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: " |
c59bba75 DS |
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 | ||
7d12e780 | 257 | static void usbatm_complete(struct urb *urb) |
c59bba75 DS |
258 | { |
259 | struct usbatm_channel *channel = urb->context; | |
260 | unsigned long flags; | |
33fea2b2 | 261 | int status = urb->status; |
c59bba75 DS |
262 | |
263 | vdbg("%s: urb 0x%p, status %d, actual_length %d", | |
33fea2b2 | 264 | __func__, urb, status, urb->actual_length); |
c59bba75 DS |
265 | |
266 | /* usually in_interrupt(), but not always */ | |
267 | spin_lock_irqsave(&channel->lock, flags); | |
268 | ||
269 | /* must add to the back when receiving; doesn't matter when sending */ | |
270 | list_add_tail(&urb->urb_list, &channel->list); | |
271 | ||
272 | spin_unlock_irqrestore(&channel->lock, flags); | |
273 | ||
33fea2b2 | 274 | if (unlikely(status) && |
a3673d3c | 275 | (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) || |
9196cc7b | 276 | status != -EILSEQ)) { |
33fea2b2 | 277 | if (status == -ESHUTDOWN) |
7d5e1dd4 SA |
278 | return; |
279 | ||
0ec3c7e8 DS |
280 | if (printk_ratelimit()) |
281 | atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n", | |
33fea2b2 | 282 | __func__, urb, status); |
c59bba75 DS |
283 | /* throttle processing in case of an error */ |
284 | mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); | |
0ec3c7e8 | 285 | } else |
c59bba75 DS |
286 | tasklet_schedule(&channel->tasklet); |
287 | } | |
288 | ||
289 | ||
290 | /************* | |
291 | ** decode ** | |
292 | *************/ | |
293 | ||
294 | static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance, | |
295 | short vpi, int vci) | |
296 | { | |
0ec3c7e8 | 297 | struct usbatm_vcc_data *vcc_data; |
c59bba75 | 298 | |
0ec3c7e8 DS |
299 | list_for_each_entry(vcc_data, &instance->vcc_list, list) |
300 | if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi)) | |
301 | return vcc_data; | |
c59bba75 DS |
302 | return NULL; |
303 | } | |
304 | ||
e3fb2f64 | 305 | static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source) |
c59bba75 | 306 | { |
c59bba75 DS |
307 | struct atm_vcc *vcc; |
308 | struct sk_buff *sarb; | |
e3fb2f64 DS |
309 | short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4); |
310 | int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4); | |
311 | u8 pti = ((source[3] & 0xe) >> 1); | |
c59bba75 | 312 | |
e3fb2f64 | 313 | vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti); |
c59bba75 | 314 | |
e3fb2f64 DS |
315 | if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) { |
316 | instance->cached_vpi = vpi; | |
317 | instance->cached_vci = vci; | |
c59bba75 | 318 | |
e3fb2f64 | 319 | instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci); |
e20d6645 | 320 | |
e3fb2f64 DS |
321 | if (!instance->cached_vcc) |
322 | atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci); | |
323 | } | |
e20d6645 | 324 | |
e3fb2f64 DS |
325 | if (!instance->cached_vcc) |
326 | return; | |
c59bba75 | 327 | |
e3fb2f64 | 328 | vcc = instance->cached_vcc->vcc; |
e20d6645 | 329 | |
e3fb2f64 DS |
330 | /* OAM F5 end-to-end */ |
331 | if (pti == ATM_PTI_E2EF5) { | |
332 | if (printk_ratelimit()) | |
333 | atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n", | |
334 | __func__, vpi, vci); | |
335 | atomic_inc(&vcc->stats->rx_err); | |
336 | return; | |
337 | } | |
c59bba75 | 338 | |
e3fb2f64 | 339 | sarb = instance->cached_vcc->sarb; |
c59bba75 | 340 | |
4305b541 | 341 | if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) { |
e3fb2f64 DS |
342 | atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n", |
343 | __func__, sarb->len, vcc); | |
344 | /* discard cells already received */ | |
345 | skb_trim(sarb, 0); | |
3b6004f3 | 346 | UDSL_ASSERT(instance, sarb->tail + ATM_CELL_PAYLOAD <= sarb->end); |
e3fb2f64 | 347 | } |
c59bba75 | 348 | |
27a884dc | 349 | memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD); |
e3fb2f64 | 350 | __skb_put(sarb, ATM_CELL_PAYLOAD); |
c59bba75 | 351 | |
e3fb2f64 DS |
352 | if (pti & 1) { |
353 | struct sk_buff *skb; | |
354 | unsigned int length; | |
355 | unsigned int pdu_length; | |
c59bba75 | 356 | |
e3fb2f64 | 357 | length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5]; |
c59bba75 | 358 | |
e3fb2f64 DS |
359 | /* guard against overflow */ |
360 | if (length > ATM_MAX_AAL5_PDU) { | |
361 | atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n", | |
362 | __func__, length, vcc); | |
363 | atomic_inc(&vcc->stats->rx_err); | |
364 | goto out; | |
365 | } | |
c59bba75 | 366 | |
e3fb2f64 | 367 | pdu_length = usbatm_pdu_length(length); |
c59bba75 | 368 | |
e3fb2f64 DS |
369 | if (sarb->len < pdu_length) { |
370 | atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n", | |
371 | __func__, pdu_length, sarb->len, vcc); | |
372 | atomic_inc(&vcc->stats->rx_err); | |
373 | goto out; | |
374 | } | |
c59bba75 | 375 | |
27a884dc | 376 | if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) { |
e3fb2f64 DS |
377 | atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n", |
378 | __func__, vcc); | |
379 | atomic_inc(&vcc->stats->rx_err); | |
380 | goto out; | |
381 | } | |
c59bba75 | 382 | |
e3fb2f64 | 383 | vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc); |
c59bba75 | 384 | |
e3fb2f64 DS |
385 | if (!(skb = dev_alloc_skb(length))) { |
386 | if (printk_ratelimit()) | |
387 | atm_err(instance, "%s: no memory for skb (length: %u)!\n", | |
388 | __func__, length); | |
389 | atomic_inc(&vcc->stats->rx_drop); | |
390 | goto out; | |
391 | } | |
c59bba75 | 392 | |
e3fb2f64 | 393 | vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize); |
c59bba75 | 394 | |
e3fb2f64 DS |
395 | if (!atm_charge(vcc, skb->truesize)) { |
396 | atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n", | |
397 | __func__, skb->truesize); | |
398 | dev_kfree_skb_any(skb); | |
399 | goto out; /* atm_charge increments rx_drop */ | |
400 | } | |
c59bba75 | 401 | |
27d7ff46 ACM |
402 | skb_copy_to_linear_data(skb, |
403 | skb_tail_pointer(sarb) - pdu_length, | |
404 | length); | |
e3fb2f64 | 405 | __skb_put(skb, length); |
c59bba75 | 406 | |
e3fb2f64 DS |
407 | vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u", |
408 | __func__, skb, skb->len, skb->truesize); | |
c59bba75 | 409 | |
e3fb2f64 | 410 | PACKETDEBUG(skb->data, skb->len); |
c59bba75 | 411 | |
e3fb2f64 | 412 | vcc->push(vcc, skb); |
c59bba75 | 413 | |
e3fb2f64 DS |
414 | atomic_inc(&vcc->stats->rx); |
415 | out: | |
416 | skb_trim(sarb, 0); | |
417 | } | |
418 | } | |
c59bba75 | 419 | |
e3fb2f64 DS |
420 | static void usbatm_extract_cells(struct usbatm_data *instance, |
421 | unsigned char *source, unsigned int avail_data) | |
422 | { | |
423 | unsigned int stride = instance->rx_channel.stride; | |
424 | unsigned int buf_usage = instance->buf_usage; | |
425 | ||
426 | /* extract cells from incoming data, taking into account that | |
427 | * the length of avail data may not be a multiple of stride */ | |
428 | ||
429 | if (buf_usage > 0) { | |
430 | /* we have a partially received atm cell */ | |
431 | unsigned char *cell_buf = instance->cell_buf; | |
432 | unsigned int space_left = stride - buf_usage; | |
433 | ||
3b6004f3 | 434 | UDSL_ASSERT(instance, buf_usage <= stride); |
e3fb2f64 DS |
435 | |
436 | if (avail_data >= space_left) { | |
437 | /* add new data and process cell */ | |
438 | memcpy(cell_buf + buf_usage, source, space_left); | |
439 | source += space_left; | |
440 | avail_data -= space_left; | |
441 | usbatm_extract_one_cell(instance, cell_buf); | |
442 | instance->buf_usage = 0; | |
443 | } else { | |
444 | /* not enough data to fill the cell */ | |
445 | memcpy(cell_buf + buf_usage, source, avail_data); | |
446 | instance->buf_usage = buf_usage + avail_data; | |
447 | return; | |
c59bba75 DS |
448 | } |
449 | } | |
e3fb2f64 DS |
450 | |
451 | for (; avail_data >= stride; avail_data -= stride, source += stride) | |
452 | usbatm_extract_one_cell(instance, source); | |
453 | ||
454 | if (avail_data > 0) { | |
455 | /* length was not a multiple of stride - | |
456 | * save remaining data for next call */ | |
457 | memcpy(instance->cell_buf, source, avail_data); | |
458 | instance->buf_usage = avail_data; | |
459 | } | |
c59bba75 DS |
460 | } |
461 | ||
462 | ||
463 | /************* | |
464 | ** encode ** | |
465 | *************/ | |
466 | ||
467 | static unsigned int usbatm_write_cells(struct usbatm_data *instance, | |
468 | struct sk_buff *skb, | |
469 | u8 *target, unsigned int avail_space) | |
470 | { | |
471 | struct usbatm_control *ctrl = UDSL_SKB(skb); | |
472 | struct atm_vcc *vcc = ctrl->atm.vcc; | |
6f749475 | 473 | unsigned int bytes_written; |
c59bba75 DS |
474 | unsigned int stride = instance->tx_channel.stride; |
475 | ||
476 | vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space); | |
3b6004f3 | 477 | UDSL_ASSERT(instance, !(avail_space % stride)); |
c59bba75 | 478 | |
6f749475 DS |
479 | for (bytes_written = 0; bytes_written < avail_space && ctrl->len; |
480 | bytes_written += stride, target += stride) { | |
c59bba75 DS |
481 | unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD); |
482 | unsigned int left = ATM_CELL_PAYLOAD - data_len; | |
483 | u8 *ptr = target; | |
484 | ||
485 | ptr[0] = vcc->vpi >> 4; | |
486 | ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12); | |
487 | ptr[2] = vcc->vci >> 4; | |
488 | ptr[3] = vcc->vci << 4; | |
489 | ptr[4] = 0xec; | |
490 | ptr += ATM_CELL_HEADER; | |
491 | ||
d626f62b | 492 | skb_copy_from_linear_data(skb, ptr, data_len); |
c59bba75 DS |
493 | ptr += data_len; |
494 | __skb_pull(skb, data_len); | |
495 | ||
9196cc7b | 496 | if (!left) |
c59bba75 DS |
497 | continue; |
498 | ||
499 | memset(ptr, 0, left); | |
500 | ||
501 | if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */ | |
502 | u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER; | |
503 | /* trailer[0] = 0; UU = 0 */ | |
504 | /* trailer[1] = 0; CPI = 0 */ | |
505 | trailer[2] = ctrl->len >> 8; | |
506 | trailer[3] = ctrl->len; | |
507 | ||
9196cc7b | 508 | ctrl->crc = ~crc32_be(ctrl->crc, ptr, left - 4); |
c59bba75 DS |
509 | |
510 | trailer[4] = ctrl->crc >> 24; | |
511 | trailer[5] = ctrl->crc >> 16; | |
512 | trailer[6] = ctrl->crc >> 8; | |
513 | trailer[7] = ctrl->crc; | |
514 | ||
515 | target[3] |= 0x2; /* adjust PTI */ | |
516 | ||
517 | ctrl->len = 0; /* tag this skb finished */ | |
6c4b7f70 | 518 | } else |
c59bba75 DS |
519 | ctrl->crc = crc32_be(ctrl->crc, ptr, left); |
520 | } | |
521 | ||
6f749475 | 522 | return bytes_written; |
c59bba75 DS |
523 | } |
524 | ||
525 | ||
526 | /************** | |
527 | ** receive ** | |
528 | **************/ | |
529 | ||
530 | static void usbatm_rx_process(unsigned long data) | |
531 | { | |
532 | struct usbatm_data *instance = (struct usbatm_data *)data; | |
533 | struct urb *urb; | |
534 | ||
535 | while ((urb = usbatm_pop_urb(&instance->rx_channel))) { | |
536 | vdbg("%s: processing urb 0x%p", __func__, urb); | |
537 | ||
538 | if (usb_pipeisoc(urb->pipe)) { | |
e3fb2f64 DS |
539 | unsigned char *merge_start = NULL; |
540 | unsigned int merge_length = 0; | |
541 | const unsigned int packet_size = instance->rx_channel.packet_size; | |
c59bba75 | 542 | int i; |
e3fb2f64 DS |
543 | |
544 | for (i = 0; i < urb->number_of_packets; i++) { | |
545 | if (!urb->iso_frame_desc[i].status) { | |
546 | unsigned int actual_length = urb->iso_frame_desc[i].actual_length; | |
547 | ||
3b6004f3 | 548 | UDSL_ASSERT(instance, actual_length <= packet_size); |
e3fb2f64 DS |
549 | |
550 | if (!merge_length) | |
551 | merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; | |
552 | merge_length += actual_length; | |
553 | if (merge_length && (actual_length < packet_size)) { | |
554 | usbatm_extract_cells(instance, merge_start, merge_length); | |
555 | merge_length = 0; | |
556 | } | |
557 | } else { | |
558 | atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i); | |
559 | if (merge_length) | |
560 | usbatm_extract_cells(instance, merge_start, merge_length); | |
561 | merge_length = 0; | |
562 | instance->buf_usage = 0; | |
563 | } | |
564 | } | |
565 | ||
566 | if (merge_length) | |
567 | usbatm_extract_cells(instance, merge_start, merge_length); | |
568 | } else | |
c59bba75 DS |
569 | if (!urb->status) |
570 | usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length); | |
e3fb2f64 DS |
571 | else |
572 | instance->buf_usage = 0; | |
c59bba75 DS |
573 | |
574 | if (usbatm_submit_urb(urb)) | |
575 | return; | |
576 | } | |
577 | } | |
578 | ||
579 | ||
580 | /*********** | |
581 | ** send ** | |
582 | ***********/ | |
583 | ||
584 | static void usbatm_tx_process(unsigned long data) | |
585 | { | |
586 | struct usbatm_data *instance = (struct usbatm_data *)data; | |
587 | struct sk_buff *skb = instance->current_skb; | |
588 | struct urb *urb = NULL; | |
589 | const unsigned int buf_size = instance->tx_channel.buf_size; | |
6f749475 | 590 | unsigned int bytes_written = 0; |
c59bba75 DS |
591 | u8 *buffer = NULL; |
592 | ||
593 | if (!skb) | |
594 | skb = skb_dequeue(&instance->sndqueue); | |
595 | ||
596 | while (skb) { | |
597 | if (!urb) { | |
598 | urb = usbatm_pop_urb(&instance->tx_channel); | |
599 | if (!urb) | |
600 | break; /* no more senders */ | |
601 | buffer = urb->transfer_buffer; | |
6f749475 | 602 | bytes_written = (urb->status == -EAGAIN) ? |
c59bba75 DS |
603 | urb->transfer_buffer_length : 0; |
604 | } | |
605 | ||
6f749475 DS |
606 | bytes_written += usbatm_write_cells(instance, skb, |
607 | buffer + bytes_written, | |
608 | buf_size - bytes_written); | |
c59bba75 DS |
609 | |
610 | vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p", | |
6f749475 | 611 | __func__, bytes_written, skb, urb); |
c59bba75 DS |
612 | |
613 | if (!UDSL_SKB(skb)->len) { | |
614 | struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc; | |
615 | ||
616 | usbatm_pop(vcc, skb); | |
617 | atomic_inc(&vcc->stats->tx); | |
618 | ||
619 | skb = skb_dequeue(&instance->sndqueue); | |
620 | } | |
621 | ||
6f749475 DS |
622 | if (bytes_written == buf_size || (!skb && bytes_written)) { |
623 | urb->transfer_buffer_length = bytes_written; | |
c59bba75 DS |
624 | |
625 | if (usbatm_submit_urb(urb)) | |
626 | break; | |
627 | urb = NULL; | |
628 | } | |
629 | } | |
630 | ||
631 | instance->current_skb = skb; | |
632 | } | |
633 | ||
634 | static void usbatm_cancel_send(struct usbatm_data *instance, | |
635 | struct atm_vcc *vcc) | |
636 | { | |
637 | struct sk_buff *skb, *n; | |
638 | ||
639 | atm_dbg(instance, "%s entered\n", __func__); | |
640 | spin_lock_irq(&instance->sndqueue.lock); | |
b5f61ab9 | 641 | skb_queue_walk_safe(&instance->sndqueue, skb, n) { |
c59bba75 DS |
642 | if (UDSL_SKB(skb)->atm.vcc == vcc) { |
643 | atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb); | |
644 | __skb_unlink(skb, &instance->sndqueue); | |
645 | usbatm_pop(vcc, skb); | |
646 | } | |
b5f61ab9 | 647 | } |
c59bba75 DS |
648 | spin_unlock_irq(&instance->sndqueue.lock); |
649 | ||
650 | tasklet_disable(&instance->tx_channel.tasklet); | |
651 | if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) { | |
652 | atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb); | |
653 | instance->current_skb = NULL; | |
654 | usbatm_pop(vcc, skb); | |
655 | } | |
656 | tasklet_enable(&instance->tx_channel.tasklet); | |
657 | atm_dbg(instance, "%s done\n", __func__); | |
658 | } | |
659 | ||
660 | static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) | |
661 | { | |
662 | struct usbatm_data *instance = vcc->dev->dev_data; | |
663 | struct usbatm_control *ctrl = UDSL_SKB(skb); | |
664 | int err; | |
665 | ||
666 | vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len); | |
667 | ||
0e42a627 DS |
668 | /* racy disconnection check - fine */ |
669 | if (!instance || instance->disconnected) { | |
670 | #ifdef DEBUG | |
671 | if (printk_ratelimit()) | |
672 | printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance"); | |
673 | #endif | |
c59bba75 DS |
674 | err = -ENODEV; |
675 | goto fail; | |
676 | } | |
677 | ||
678 | if (vcc->qos.aal != ATM_AAL5) { | |
0ec3c7e8 | 679 | atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); |
c59bba75 DS |
680 | err = -EINVAL; |
681 | goto fail; | |
682 | } | |
683 | ||
684 | if (skb->len > ATM_MAX_AAL5_PDU) { | |
0ec3c7e8 | 685 | atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n", |
c59bba75 DS |
686 | __func__, skb->len, ATM_MAX_AAL5_PDU); |
687 | err = -EINVAL; | |
688 | goto fail; | |
689 | } | |
690 | ||
691 | PACKETDEBUG(skb->data, skb->len); | |
692 | ||
693 | /* initialize the control block */ | |
694 | ctrl->atm.vcc = vcc; | |
695 | ctrl->len = skb->len; | |
696 | ctrl->crc = crc32_be(~0, skb->data, skb->len); | |
697 | ||
698 | skb_queue_tail(&instance->sndqueue, skb); | |
699 | tasklet_schedule(&instance->tx_channel.tasklet); | |
700 | ||
701 | return 0; | |
702 | ||
703 | fail: | |
704 | usbatm_pop(vcc, skb); | |
705 | return err; | |
706 | } | |
707 | ||
708 | ||
709 | /******************** | |
710 | ** bean counting ** | |
711 | ********************/ | |
712 | ||
713 | static void usbatm_destroy_instance(struct kref *kref) | |
714 | { | |
715 | struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount); | |
716 | ||
717 | dbg("%s", __func__); | |
718 | ||
719 | tasklet_kill(&instance->rx_channel.tasklet); | |
720 | tasklet_kill(&instance->tx_channel.tasklet); | |
721 | usb_put_dev(instance->usb_dev); | |
722 | kfree(instance); | |
723 | } | |
724 | ||
3d48586c | 725 | static void usbatm_get_instance(struct usbatm_data *instance) |
c59bba75 DS |
726 | { |
727 | dbg("%s", __func__); | |
728 | ||
729 | kref_get(&instance->refcount); | |
730 | } | |
731 | ||
3d48586c | 732 | static void usbatm_put_instance(struct usbatm_data *instance) |
c59bba75 DS |
733 | { |
734 | dbg("%s", __func__); | |
735 | ||
736 | kref_put(&instance->refcount, usbatm_destroy_instance); | |
737 | } | |
738 | ||
739 | ||
740 | /********** | |
741 | ** ATM ** | |
742 | **********/ | |
743 | ||
0ec3c7e8 | 744 | static void usbatm_atm_dev_close(struct atm_dev *atm_dev) |
c59bba75 | 745 | { |
0ec3c7e8 | 746 | struct usbatm_data *instance = atm_dev->dev_data; |
c59bba75 DS |
747 | |
748 | dbg("%s", __func__); | |
749 | ||
750 | if (!instance) | |
751 | return; | |
752 | ||
0ec3c7e8 | 753 | atm_dev->dev_data = NULL; /* catch bugs */ |
c59bba75 DS |
754 | usbatm_put_instance(instance); /* taken in usbatm_atm_init */ |
755 | } | |
756 | ||
757 | static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page) | |
758 | { | |
759 | struct usbatm_data *instance = atm_dev->dev_data; | |
760 | int left = *pos; | |
761 | ||
762 | if (!instance) { | |
763 | dbg("%s: NULL instance!", __func__); | |
764 | return -ENODEV; | |
765 | } | |
766 | ||
767 | if (!left--) | |
768 | return sprintf(page, "%s\n", instance->description); | |
769 | ||
770 | if (!left--) | |
7c510e4b | 771 | return sprintf(page, "MAC: %pM\n", atm_dev->esi); |
c59bba75 DS |
772 | |
773 | if (!left--) | |
774 | return sprintf(page, | |
775 | "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n", | |
776 | atomic_read(&atm_dev->stats.aal5.tx), | |
777 | atomic_read(&atm_dev->stats.aal5.tx_err), | |
778 | atomic_read(&atm_dev->stats.aal5.rx), | |
779 | atomic_read(&atm_dev->stats.aal5.rx_err), | |
780 | atomic_read(&atm_dev->stats.aal5.rx_drop)); | |
781 | ||
0e42a627 DS |
782 | if (!left--) { |
783 | if (instance->disconnected) | |
784 | return sprintf(page, "Disconnected\n"); | |
785 | else | |
786 | switch (atm_dev->signal) { | |
787 | case ATM_PHY_SIG_FOUND: | |
788 | return sprintf(page, "Line up\n"); | |
789 | case ATM_PHY_SIG_LOST: | |
790 | return sprintf(page, "Line down\n"); | |
791 | default: | |
792 | return sprintf(page, "Line state unknown\n"); | |
793 | } | |
794 | } | |
c59bba75 DS |
795 | |
796 | return 0; | |
797 | } | |
798 | ||
799 | static int usbatm_atm_open(struct atm_vcc *vcc) | |
800 | { | |
801 | struct usbatm_data *instance = vcc->dev->dev_data; | |
802 | struct usbatm_vcc_data *new = NULL; | |
803 | int ret; | |
804 | int vci = vcc->vci; | |
805 | short vpi = vcc->vpi; | |
806 | ||
807 | if (!instance) { | |
808 | dbg("%s: NULL data!", __func__); | |
809 | return -ENODEV; | |
810 | } | |
811 | ||
812 | atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci); | |
813 | ||
814 | /* only support AAL5 */ | |
0ec3c7e8 DS |
815 | if ((vcc->qos.aal != ATM_AAL5)) { |
816 | atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); | |
817 | return -EINVAL; | |
818 | } | |
819 | ||
820 | /* sanity checks */ | |
821 | if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) { | |
822 | atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu); | |
c59bba75 DS |
823 | return -EINVAL; |
824 | } | |
825 | ||
ab3c81ff | 826 | mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */ |
c59bba75 | 827 | |
0e42a627 DS |
828 | if (instance->disconnected) { |
829 | atm_dbg(instance, "%s: disconnected!\n", __func__); | |
830 | ret = -ENODEV; | |
831 | goto fail; | |
832 | } | |
833 | ||
c59bba75 DS |
834 | if (usbatm_find_vcc(instance, vpi, vci)) { |
835 | atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci); | |
836 | ret = -EADDRINUSE; | |
837 | goto fail; | |
838 | } | |
839 | ||
9a734efe | 840 | if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) { |
0ec3c7e8 | 841 | atm_err(instance, "%s: no memory for vcc_data!\n", __func__); |
c59bba75 DS |
842 | ret = -ENOMEM; |
843 | goto fail; | |
844 | } | |
845 | ||
c59bba75 DS |
846 | new->vcc = vcc; |
847 | new->vpi = vpi; | |
848 | new->vci = vci; | |
849 | ||
850 | new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL); | |
851 | if (!new->sarb) { | |
0ec3c7e8 | 852 | atm_err(instance, "%s: no memory for SAR buffer!\n", __func__); |
c59bba75 DS |
853 | ret = -ENOMEM; |
854 | goto fail; | |
855 | } | |
856 | ||
857 | vcc->dev_data = new; | |
858 | ||
859 | tasklet_disable(&instance->rx_channel.tasklet); | |
e3fb2f64 DS |
860 | instance->cached_vcc = new; |
861 | instance->cached_vpi = vpi; | |
862 | instance->cached_vci = vci; | |
c59bba75 DS |
863 | list_add(&new->list, &instance->vcc_list); |
864 | tasklet_enable(&instance->rx_channel.tasklet); | |
865 | ||
866 | set_bit(ATM_VF_ADDR, &vcc->flags); | |
867 | set_bit(ATM_VF_PARTIAL, &vcc->flags); | |
868 | set_bit(ATM_VF_READY, &vcc->flags); | |
869 | ||
ab3c81ff | 870 | mutex_unlock(&instance->serialize); |
c59bba75 DS |
871 | |
872 | atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new); | |
873 | ||
874 | return 0; | |
875 | ||
876 | fail: | |
877 | kfree(new); | |
ab3c81ff | 878 | mutex_unlock(&instance->serialize); |
c59bba75 DS |
879 | return ret; |
880 | } | |
881 | ||
882 | static void usbatm_atm_close(struct atm_vcc *vcc) | |
883 | { | |
884 | struct usbatm_data *instance = vcc->dev->dev_data; | |
885 | struct usbatm_vcc_data *vcc_data = vcc->dev_data; | |
886 | ||
887 | if (!instance || !vcc_data) { | |
888 | dbg("%s: NULL data!", __func__); | |
889 | return; | |
890 | } | |
891 | ||
892 | atm_dbg(instance, "%s entered\n", __func__); | |
893 | ||
894 | atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n", | |
895 | __func__, vcc_data, vcc_data->vpi, vcc_data->vci); | |
896 | ||
897 | usbatm_cancel_send(instance, vcc); | |
898 | ||
ab3c81ff | 899 | mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */ |
c59bba75 DS |
900 | |
901 | tasklet_disable(&instance->rx_channel.tasklet); | |
e3fb2f64 DS |
902 | if (instance->cached_vcc == vcc_data) { |
903 | instance->cached_vcc = NULL; | |
904 | instance->cached_vpi = ATM_VPI_UNSPEC; | |
905 | instance->cached_vci = ATM_VCI_UNSPEC; | |
906 | } | |
c59bba75 DS |
907 | list_del(&vcc_data->list); |
908 | tasklet_enable(&instance->rx_channel.tasklet); | |
909 | ||
910 | kfree_skb(vcc_data->sarb); | |
911 | vcc_data->sarb = NULL; | |
912 | ||
913 | kfree(vcc_data); | |
914 | vcc->dev_data = NULL; | |
915 | ||
916 | vcc->vpi = ATM_VPI_UNSPEC; | |
917 | vcc->vci = ATM_VCI_UNSPEC; | |
918 | clear_bit(ATM_VF_READY, &vcc->flags); | |
919 | clear_bit(ATM_VF_PARTIAL, &vcc->flags); | |
920 | clear_bit(ATM_VF_ADDR, &vcc->flags); | |
921 | ||
ab3c81ff | 922 | mutex_unlock(&instance->serialize); |
c59bba75 DS |
923 | |
924 | atm_dbg(instance, "%s successful\n", __func__); | |
925 | } | |
926 | ||
0ec3c7e8 | 927 | static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, |
c59bba75 DS |
928 | void __user * arg) |
929 | { | |
0e42a627 DS |
930 | struct usbatm_data *instance = atm_dev->dev_data; |
931 | ||
932 | if (!instance || instance->disconnected) { | |
933 | dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance"); | |
934 | return -ENODEV; | |
935 | } | |
936 | ||
c59bba75 DS |
937 | switch (cmd) { |
938 | case ATM_QUERYLOOP: | |
939 | return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0; | |
940 | default: | |
941 | return -ENOIOCTLCMD; | |
942 | } | |
943 | } | |
944 | ||
945 | static int usbatm_atm_init(struct usbatm_data *instance) | |
946 | { | |
947 | struct atm_dev *atm_dev; | |
948 | int ret, i; | |
949 | ||
0ec3c7e8 DS |
950 | /* ATM init. The ATM initialization scheme suffers from an intrinsic race |
951 | * condition: callbacks we register can be executed at once, before we have | |
952 | * initialized the struct atm_dev. To protect against this, all callbacks | |
953 | * abort if atm_dev->dev_data is NULL. */ | |
d9ca676b DW |
954 | atm_dev = atm_dev_register(instance->driver_name, |
955 | &instance->usb_intf->dev, &usbatm_atm_devops, | |
956 | -1, NULL); | |
c59bba75 | 957 | if (!atm_dev) { |
0ec3c7e8 | 958 | usb_err(instance, "%s: failed to register ATM device!\n", __func__); |
c59bba75 DS |
959 | return -1; |
960 | } | |
961 | ||
962 | instance->atm_dev = atm_dev; | |
963 | ||
964 | atm_dev->ci_range.vpi_bits = ATM_CI_MAX; | |
965 | atm_dev->ci_range.vci_bits = ATM_CI_MAX; | |
966 | atm_dev->signal = ATM_PHY_SIG_UNKNOWN; | |
967 | ||
968 | /* temp init ATM device, set to 128kbit */ | |
969 | atm_dev->link_rate = 128 * 1000 / 424; | |
970 | ||
971 | if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) { | |
0ec3c7e8 | 972 | atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret); |
c59bba75 DS |
973 | goto fail; |
974 | } | |
975 | ||
c59bba75 | 976 | usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */ |
0ec3c7e8 DS |
977 | |
978 | /* ready for ATM callbacks */ | |
c59bba75 DS |
979 | mb(); |
980 | atm_dev->dev_data = instance; | |
981 | ||
982 | /* submit all rx URBs */ | |
983 | for (i = 0; i < num_rcv_urbs; i++) | |
984 | usbatm_submit_urb(instance->urbs[i]); | |
985 | ||
986 | return 0; | |
987 | ||
988 | fail: | |
989 | instance->atm_dev = NULL; | |
64bf69dd | 990 | atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */ |
c59bba75 DS |
991 | return ret; |
992 | } | |
993 | ||
994 | ||
995 | /********** | |
996 | ** USB ** | |
997 | **********/ | |
998 | ||
999 | static int usbatm_do_heavy_init(void *arg) | |
1000 | { | |
1001 | struct usbatm_data *instance = arg; | |
1002 | int ret; | |
1003 | ||
c59bba75 | 1004 | allow_signal(SIGTERM); |
c59bba75 DS |
1005 | complete(&instance->thread_started); |
1006 | ||
1007 | ret = instance->driver->heavy_init(instance, instance->usb_intf); | |
1008 | ||
1009 | if (!ret) | |
1010 | ret = usbatm_atm_init(instance); | |
1011 | ||
ab3c81ff | 1012 | mutex_lock(&instance->serialize); |
c4504a7e | 1013 | instance->thread = NULL; |
ab3c81ff | 1014 | mutex_unlock(&instance->serialize); |
c59bba75 DS |
1015 | |
1016 | complete_and_exit(&instance->thread_exited, ret); | |
1017 | } | |
1018 | ||
1019 | static int usbatm_heavy_init(struct usbatm_data *instance) | |
1020 | { | |
c4504a7e PE |
1021 | struct task_struct *t; |
1022 | ||
1023 | t = kthread_create(usbatm_do_heavy_init, instance, | |
1024 | instance->driver->driver_name); | |
1025 | if (IS_ERR(t)) { | |
1026 | usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n", | |
1027 | __func__, PTR_ERR(t)); | |
1028 | return PTR_ERR(t); | |
c59bba75 DS |
1029 | } |
1030 | ||
c4504a7e PE |
1031 | instance->thread = t; |
1032 | wake_up_process(t); | |
c59bba75 DS |
1033 | wait_for_completion(&instance->thread_started); |
1034 | ||
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | static void usbatm_tasklet_schedule(unsigned long data) | |
1039 | { | |
1040 | tasklet_schedule((struct tasklet_struct *) data); | |
1041 | } | |
1042 | ||
fcf4830a | 1043 | static void usbatm_init_channel(struct usbatm_channel *channel) |
c59bba75 DS |
1044 | { |
1045 | spin_lock_init(&channel->lock); | |
1046 | INIT_LIST_HEAD(&channel->list); | |
1047 | channel->delay.function = usbatm_tasklet_schedule; | |
1048 | channel->delay.data = (unsigned long) &channel->tasklet; | |
1049 | init_timer(&channel->delay); | |
1050 | } | |
1051 | ||
1052 | int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, | |
1053 | struct usbatm_driver *driver) | |
1054 | { | |
1055 | struct device *dev = &intf->dev; | |
1056 | struct usb_device *usb_dev = interface_to_usbdev(intf); | |
1057 | struct usbatm_data *instance; | |
1058 | char *buf; | |
1059 | int error = -ENOMEM; | |
1060 | int i, length; | |
6f749475 | 1061 | unsigned int maxpacket, num_packets; |
c59bba75 | 1062 | |
0ec3c7e8 | 1063 | dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n", |
c59bba75 DS |
1064 | __func__, driver->driver_name, |
1065 | le16_to_cpu(usb_dev->descriptor.idVendor), | |
1066 | le16_to_cpu(usb_dev->descriptor.idProduct), | |
1067 | intf->altsetting->desc.bInterfaceNumber); | |
1068 | ||
1069 | /* instance init */ | |
7b842b6e | 1070 | instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL); |
c59bba75 | 1071 | if (!instance) { |
0ec3c7e8 | 1072 | dev_err(dev, "%s: no memory for instance data!\n", __func__); |
c59bba75 DS |
1073 | return -ENOMEM; |
1074 | } | |
1075 | ||
c59bba75 DS |
1076 | /* public fields */ |
1077 | ||
1078 | instance->driver = driver; | |
1079 | snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name); | |
1080 | ||
1081 | instance->usb_dev = usb_dev; | |
1082 | instance->usb_intf = intf; | |
1083 | ||
1084 | buf = instance->description; | |
1085 | length = sizeof(instance->description); | |
1086 | ||
1087 | if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0) | |
1088 | goto bind; | |
1089 | ||
1090 | buf += i; | |
1091 | length -= i; | |
1092 | ||
1093 | i = scnprintf(buf, length, " ("); | |
1094 | buf += i; | |
1095 | length -= i; | |
1096 | ||
1097 | if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0) | |
1098 | goto bind; | |
1099 | ||
1100 | buf += i; | |
1101 | length -= i; | |
1102 | ||
1103 | snprintf(buf, length, ")"); | |
1104 | ||
1105 | bind: | |
35644b0c | 1106 | if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) { |
0ec3c7e8 | 1107 | dev_err(dev, "%s: bind failed: %d!\n", __func__, error); |
c59bba75 DS |
1108 | goto fail_free; |
1109 | } | |
1110 | ||
1111 | /* private fields */ | |
1112 | ||
1113 | kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */ | |
ab3c81ff | 1114 | mutex_init(&instance->serialize); |
c59bba75 | 1115 | |
c4504a7e | 1116 | instance->thread = NULL; |
c59bba75 DS |
1117 | init_completion(&instance->thread_started); |
1118 | init_completion(&instance->thread_exited); | |
1119 | ||
1120 | INIT_LIST_HEAD(&instance->vcc_list); | |
80aae7a1 | 1121 | skb_queue_head_init(&instance->sndqueue); |
c59bba75 DS |
1122 | |
1123 | usbatm_init_channel(&instance->rx_channel); | |
1124 | usbatm_init_channel(&instance->tx_channel); | |
1125 | tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance); | |
1126 | tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance); | |
c59bba75 DS |
1127 | instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding; |
1128 | instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding; | |
c59bba75 DS |
1129 | instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance; |
1130 | ||
80aae7a1 DS |
1131 | if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in) |
1132 | instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in); | |
1133 | else | |
1134 | instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in); | |
1135 | ||
1136 | instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out); | |
1137 | ||
6f749475 | 1138 | /* tx buffer size must be a positive multiple of the stride */ |
9196cc7b | 1139 | instance->tx_channel.buf_size = max(instance->tx_channel.stride, |
6f749475 DS |
1140 | snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride)); |
1141 | ||
1142 | /* rx buffer size must be a positive multiple of the endpoint maxpacket */ | |
1143 | maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0); | |
1144 | ||
1145 | if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) { | |
1146 | dev_err(dev, "%s: invalid endpoint %02x!\n", __func__, | |
1147 | usb_pipeendpoint(instance->rx_channel.endpoint)); | |
1148 | error = -EINVAL; | |
1149 | goto fail_unbind; | |
1150 | } | |
1151 | ||
9196cc7b | 1152 | num_packets = max(1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */ |
6f749475 DS |
1153 | |
1154 | if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE) | |
1155 | num_packets--; | |
1156 | ||
1157 | instance->rx_channel.buf_size = num_packets * maxpacket; | |
80aae7a1 | 1158 | instance->rx_channel.packet_size = maxpacket; |
6f749475 DS |
1159 | |
1160 | #ifdef DEBUG | |
1161 | for (i = 0; i < 2; i++) { | |
1162 | struct usbatm_channel *channel = i ? | |
1163 | &instance->tx_channel : &instance->rx_channel; | |
1164 | ||
1165 | dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel); | |
1166 | } | |
1167 | #endif | |
1168 | ||
80aae7a1 | 1169 | /* initialize urbs */ |
c59bba75 DS |
1170 | |
1171 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { | |
c59bba75 | 1172 | u8 *buffer; |
c59bba75 DS |
1173 | struct usbatm_channel *channel = i < num_rcv_urbs ? |
1174 | &instance->rx_channel : &instance->tx_channel; | |
80aae7a1 DS |
1175 | struct urb *urb; |
1176 | unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0; | |
c59bba75 | 1177 | |
3b6004f3 | 1178 | UDSL_ASSERT(instance, !usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint)); |
c59bba75 DS |
1179 | |
1180 | urb = usb_alloc_urb(iso_packets, GFP_KERNEL); | |
1181 | if (!urb) { | |
0ec3c7e8 | 1182 | dev_err(dev, "%s: no memory for urb %d!\n", __func__, i); |
72ef8ab4 | 1183 | error = -ENOMEM; |
c59bba75 DS |
1184 | goto fail_unbind; |
1185 | } | |
1186 | ||
65412e48 DS |
1187 | instance->urbs[i] = urb; |
1188 | ||
9a734efe DS |
1189 | /* zero the tx padding to avoid leaking information */ |
1190 | buffer = kzalloc(channel->buf_size, GFP_KERNEL); | |
c59bba75 | 1191 | if (!buffer) { |
0ec3c7e8 | 1192 | dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i); |
72ef8ab4 | 1193 | error = -ENOMEM; |
c59bba75 DS |
1194 | goto fail_unbind; |
1195 | } | |
c59bba75 DS |
1196 | |
1197 | usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint, | |
1198 | buffer, channel->buf_size, usbatm_complete, channel); | |
1199 | if (iso_packets) { | |
1200 | int j; | |
1201 | urb->interval = 1; | |
1202 | urb->transfer_flags = URB_ISO_ASAP; | |
1203 | urb->number_of_packets = iso_packets; | |
1204 | for (j = 0; j < iso_packets; j++) { | |
80aae7a1 DS |
1205 | urb->iso_frame_desc[j].offset = channel->packet_size * j; |
1206 | urb->iso_frame_desc[j].length = channel->packet_size; | |
c59bba75 DS |
1207 | } |
1208 | } | |
1209 | ||
1210 | /* put all tx URBs on the list of spares */ | |
1211 | if (i >= num_rcv_urbs) | |
1212 | list_add_tail(&urb->urb_list, &channel->list); | |
1213 | ||
1214 | vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p", | |
1215 | __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb); | |
c59bba75 DS |
1216 | } |
1217 | ||
e3fb2f64 DS |
1218 | instance->cached_vpi = ATM_VPI_UNSPEC; |
1219 | instance->cached_vci = ATM_VCI_UNSPEC; | |
1220 | instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL); | |
1221 | ||
1222 | if (!instance->cell_buf) { | |
1223 | dev_err(dev, "%s: no memory for cell buffer!\n", __func__); | |
1224 | error = -ENOMEM; | |
1225 | goto fail_unbind; | |
1226 | } | |
1227 | ||
35644b0c | 1228 | if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) { |
c59bba75 DS |
1229 | error = usbatm_heavy_init(instance); |
1230 | } else { | |
1231 | complete(&instance->thread_exited); /* pretend that heavy_init was run */ | |
1232 | error = usbatm_atm_init(instance); | |
1233 | } | |
1234 | ||
1235 | if (error < 0) | |
1236 | goto fail_unbind; | |
1237 | ||
1238 | usb_get_dev(usb_dev); | |
1239 | usb_set_intfdata(intf, instance); | |
1240 | ||
1241 | return 0; | |
1242 | ||
1243 | fail_unbind: | |
1244 | if (instance->driver->unbind) | |
1245 | instance->driver->unbind(instance, intf); | |
1246 | fail_free: | |
e3fb2f64 DS |
1247 | kfree(instance->cell_buf); |
1248 | ||
c59bba75 DS |
1249 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { |
1250 | if (instance->urbs[i]) | |
1251 | kfree(instance->urbs[i]->transfer_buffer); | |
1252 | usb_free_urb(instance->urbs[i]); | |
1253 | } | |
1254 | ||
9196cc7b | 1255 | kfree(instance); |
c59bba75 DS |
1256 | |
1257 | return error; | |
1258 | } | |
1259 | EXPORT_SYMBOL_GPL(usbatm_usb_probe); | |
1260 | ||
1261 | void usbatm_usb_disconnect(struct usb_interface *intf) | |
1262 | { | |
1263 | struct device *dev = &intf->dev; | |
1264 | struct usbatm_data *instance = usb_get_intfdata(intf); | |
0e42a627 | 1265 | struct usbatm_vcc_data *vcc_data; |
c59bba75 DS |
1266 | int i; |
1267 | ||
1268 | dev_dbg(dev, "%s entered\n", __func__); | |
1269 | ||
1270 | if (!instance) { | |
1271 | dev_dbg(dev, "%s: NULL instance!\n", __func__); | |
1272 | return; | |
1273 | } | |
1274 | ||
1275 | usb_set_intfdata(intf, NULL); | |
1276 | ||
ab3c81ff | 1277 | mutex_lock(&instance->serialize); |
0e42a627 | 1278 | instance->disconnected = 1; |
c4504a7e PE |
1279 | if (instance->thread != NULL) |
1280 | send_sig(SIGTERM, instance->thread, 1); | |
ab3c81ff | 1281 | mutex_unlock(&instance->serialize); |
c59bba75 DS |
1282 | |
1283 | wait_for_completion(&instance->thread_exited); | |
1284 | ||
ab3c81ff | 1285 | mutex_lock(&instance->serialize); |
0e42a627 DS |
1286 | list_for_each_entry(vcc_data, &instance->vcc_list, list) |
1287 | vcc_release_async(vcc_data->vcc, -EPIPE); | |
ab3c81ff | 1288 | mutex_unlock(&instance->serialize); |
0e42a627 | 1289 | |
c59bba75 DS |
1290 | tasklet_disable(&instance->rx_channel.tasklet); |
1291 | tasklet_disable(&instance->tx_channel.tasklet); | |
1292 | ||
1293 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) | |
1294 | usb_kill_urb(instance->urbs[i]); | |
1295 | ||
1296 | del_timer_sync(&instance->rx_channel.delay); | |
1297 | del_timer_sync(&instance->tx_channel.delay); | |
1298 | ||
0e42a627 DS |
1299 | /* turn usbatm_[rt]x_process into something close to a no-op */ |
1300 | /* no need to take the spinlock */ | |
1301 | INIT_LIST_HEAD(&instance->rx_channel.list); | |
1302 | INIT_LIST_HEAD(&instance->tx_channel.list); | |
1303 | ||
1304 | tasklet_enable(&instance->rx_channel.tasklet); | |
1305 | tasklet_enable(&instance->tx_channel.tasklet); | |
1306 | ||
c59bba75 DS |
1307 | if (instance->atm_dev && instance->driver->atm_stop) |
1308 | instance->driver->atm_stop(instance, instance->atm_dev); | |
1309 | ||
1310 | if (instance->driver->unbind) | |
1311 | instance->driver->unbind(instance, intf); | |
1312 | ||
1313 | instance->driver_data = NULL; | |
1314 | ||
c59bba75 DS |
1315 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { |
1316 | kfree(instance->urbs[i]->transfer_buffer); | |
1317 | usb_free_urb(instance->urbs[i]); | |
1318 | } | |
1319 | ||
e3fb2f64 DS |
1320 | kfree(instance->cell_buf); |
1321 | ||
c59bba75 | 1322 | /* ATM finalize */ |
e9b8daf3 | 1323 | if (instance->atm_dev) { |
64bf69dd | 1324 | atm_dev_deregister(instance->atm_dev); |
9fc950d3 | 1325 | instance->atm_dev = NULL; |
e9b8daf3 | 1326 | } |
c59bba75 DS |
1327 | |
1328 | usbatm_put_instance(instance); /* taken in usbatm_usb_probe */ | |
1329 | } | |
1330 | EXPORT_SYMBOL_GPL(usbatm_usb_disconnect); | |
1331 | ||
1332 | ||
1333 | /*********** | |
1334 | ** init ** | |
1335 | ***********/ | |
1336 | ||
1337 | static int __init usbatm_usb_init(void) | |
1338 | { | |
1339 | dbg("%s: driver version %s", __func__, DRIVER_VERSION); | |
1340 | ||
08add0c7 | 1341 | if (sizeof(struct usbatm_control) > FIELD_SIZEOF(struct sk_buff, cb)) { |
c59bba75 DS |
1342 | printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name); |
1343 | return -EIO; | |
1344 | } | |
1345 | ||
1346 | if ((num_rcv_urbs > UDSL_MAX_RCV_URBS) | |
1347 | || (num_snd_urbs > UDSL_MAX_SND_URBS) | |
6f749475 DS |
1348 | || (rcv_buf_bytes < 1) |
1349 | || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE) | |
1350 | || (snd_buf_bytes < 1) | |
1351 | || (snd_buf_bytes > UDSL_MAX_BUF_SIZE)) | |
c59bba75 DS |
1352 | return -EINVAL; |
1353 | ||
1354 | return 0; | |
1355 | } | |
1356 | module_init(usbatm_usb_init); | |
1357 | ||
1358 | static void __exit usbatm_usb_exit(void) | |
1359 | { | |
1360 | dbg("%s", __func__); | |
1361 | } | |
1362 | module_exit(usbatm_usb_exit); | |
1363 | ||
1364 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
1365 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1366 | MODULE_LICENSE("GPL"); | |
1367 | MODULE_VERSION(DRIVER_VERSION); | |
1368 | ||
1369 | /************ | |
1370 | ** debug ** | |
1371 | ************/ | |
1372 | ||
1373 | #ifdef VERBOSE_DEBUG | |
1374 | static int usbatm_print_packet(const unsigned char *data, int len) | |
1375 | { | |
1376 | unsigned char buffer[256]; | |
1377 | int i = 0, j = 0; | |
1378 | ||
1379 | for (i = 0; i < len;) { | |
1380 | buffer[0] = '\0'; | |
1381 | sprintf(buffer, "%.3d :", i); | |
6c4b7f70 | 1382 | for (j = 0; (j < 16) && (i < len); j++, i++) |
c59bba75 | 1383 | sprintf(buffer, "%s %2.2x", buffer, data[i]); |
c59bba75 DS |
1384 | dbg("%s", buffer); |
1385 | } | |
1386 | return i; | |
1387 | } | |
1388 | #endif |