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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> |
bf929b3b | 84 | #include <linux/ratelimit.h> |
c59bba75 DS |
85 | |
86 | #ifdef VERBOSE_DEBUG | |
34ad569f | 87 | static int usbatm_print_packet(struct usbatm_data *instance, const unsigned char *data, int len); |
9196cc7b | 88 | #define PACKETDEBUG(arg...) usbatm_print_packet(arg) |
4c2a47a2 | 89 | #define vdbg(arg...) dev_dbg(arg) |
c59bba75 DS |
90 | #else |
91 | #define PACKETDEBUG(arg...) | |
92 | #define vdbg(arg...) | |
93 | #endif | |
94 | ||
95 | #define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>" | |
9b0e54ad | 96 | #define DRIVER_VERSION "1.10" |
c59bba75 DS |
97 | #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION |
98 | ||
99 | static const char usbatm_driver_name[] = "usbatm"; | |
100 | ||
101 | #define UDSL_MAX_RCV_URBS 16 | |
102 | #define UDSL_MAX_SND_URBS 16 | |
6275cdfa | 103 | #define UDSL_MAX_BUF_SIZE 65536 |
c59bba75 DS |
104 | #define UDSL_DEFAULT_RCV_URBS 4 |
105 | #define UDSL_DEFAULT_SND_URBS 4 | |
6275cdfa DS |
106 | #define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ |
107 | #define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ | |
c59bba75 DS |
108 | |
109 | #define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD) | |
110 | ||
111 | #define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */ | |
112 | ||
113 | static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS; | |
114 | static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS; | |
6f749475 DS |
115 | static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE; |
116 | static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE; | |
c59bba75 DS |
117 | |
118 | module_param(num_rcv_urbs, uint, S_IRUGO); | |
119 | MODULE_PARM_DESC(num_rcv_urbs, | |
120 | "Number of urbs used for reception (range: 0-" | |
121 | __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: " | |
122 | __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")"); | |
123 | ||
124 | module_param(num_snd_urbs, uint, S_IRUGO); | |
125 | MODULE_PARM_DESC(num_snd_urbs, | |
126 | "Number of urbs used for transmission (range: 0-" | |
127 | __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: " | |
128 | __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")"); | |
129 | ||
6f749475 DS |
130 | module_param(rcv_buf_bytes, uint, S_IRUGO); |
131 | MODULE_PARM_DESC(rcv_buf_bytes, | |
132 | "Size of the buffers used for reception, in bytes (range: 1-" | |
133 | __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: " | |
c59bba75 DS |
134 | __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")"); |
135 | ||
6f749475 DS |
136 | module_param(snd_buf_bytes, uint, S_IRUGO); |
137 | MODULE_PARM_DESC(snd_buf_bytes, | |
138 | "Size of the buffers used for transmission, in bytes (range: 1-" | |
6275cdfa | 139 | __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: " |
c59bba75 DS |
140 | __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")"); |
141 | ||
142 | ||
143 | /* receive */ | |
144 | ||
145 | struct usbatm_vcc_data { | |
146 | /* vpi/vci lookup */ | |
147 | struct list_head list; | |
148 | short vpi; | |
149 | int vci; | |
150 | struct atm_vcc *vcc; | |
151 | ||
152 | /* raw cell reassembly */ | |
153 | struct sk_buff *sarb; | |
154 | }; | |
155 | ||
156 | ||
157 | /* send */ | |
158 | ||
159 | struct usbatm_control { | |
160 | struct atm_skb_data atm; | |
161 | u32 len; | |
162 | u32 crc; | |
163 | }; | |
164 | ||
165 | #define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb) | |
166 | ||
167 | ||
168 | /* ATM */ | |
169 | ||
0ec3c7e8 | 170 | static void usbatm_atm_dev_close(struct atm_dev *atm_dev); |
c59bba75 DS |
171 | static int usbatm_atm_open(struct atm_vcc *vcc); |
172 | static void usbatm_atm_close(struct atm_vcc *vcc); | |
9058bdc3 | 173 | static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user *arg); |
c59bba75 | 174 | static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb); |
9058bdc3 | 175 | static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t *pos, char *page); |
c59bba75 DS |
176 | |
177 | static struct atmdev_ops usbatm_atm_devops = { | |
178 | .dev_close = usbatm_atm_dev_close, | |
179 | .open = usbatm_atm_open, | |
180 | .close = usbatm_atm_close, | |
181 | .ioctl = usbatm_atm_ioctl, | |
182 | .send = usbatm_atm_send, | |
183 | .proc_read = usbatm_atm_proc_read, | |
184 | .owner = THIS_MODULE, | |
185 | }; | |
186 | ||
187 | ||
188 | /*********** | |
189 | ** misc ** | |
190 | ***********/ | |
191 | ||
192 | static inline unsigned int usbatm_pdu_length(unsigned int length) | |
193 | { | |
194 | length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER; | |
195 | return length - length % ATM_CELL_PAYLOAD; | |
196 | } | |
197 | ||
198 | static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb) | |
199 | { | |
200 | if (vcc->pop) | |
201 | vcc->pop(vcc, skb); | |
202 | else | |
227d7761 | 203 | dev_kfree_skb_any(skb); |
c59bba75 DS |
204 | } |
205 | ||
206 | ||
207 | /*********** | |
208 | ** urbs ** | |
209 | ************/ | |
210 | ||
858119e1 | 211 | static struct urb *usbatm_pop_urb(struct usbatm_channel *channel) |
c59bba75 DS |
212 | { |
213 | struct urb *urb; | |
214 | ||
215 | spin_lock_irq(&channel->lock); | |
216 | if (list_empty(&channel->list)) { | |
217 | spin_unlock_irq(&channel->lock); | |
218 | return NULL; | |
219 | } | |
220 | ||
221 | urb = list_entry(channel->list.next, struct urb, urb_list); | |
222 | list_del(&urb->urb_list); | |
223 | spin_unlock_irq(&channel->lock); | |
224 | ||
225 | return urb; | |
226 | } | |
227 | ||
858119e1 | 228 | static int usbatm_submit_urb(struct urb *urb) |
c59bba75 DS |
229 | { |
230 | struct usbatm_channel *channel = urb->context; | |
231 | int ret; | |
232 | ||
34ad569f GKH |
233 | /* vdbg("%s: submitting urb 0x%p, size %u", |
234 | __func__, urb, urb->transfer_buffer_length); */ | |
c59bba75 DS |
235 | |
236 | ret = usb_submit_urb(urb, GFP_ATOMIC); | |
237 | if (ret) { | |
0ec3c7e8 DS |
238 | if (printk_ratelimit()) |
239 | atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n", | |
240 | __func__, urb, ret); | |
c59bba75 DS |
241 | |
242 | /* consider all errors transient and return the buffer back to the queue */ | |
243 | urb->status = -EAGAIN; | |
244 | spin_lock_irq(&channel->lock); | |
245 | ||
246 | /* must add to the front when sending; doesn't matter when receiving */ | |
247 | list_add(&urb->urb_list, &channel->list); | |
248 | ||
249 | spin_unlock_irq(&channel->lock); | |
250 | ||
251 | /* make sure the channel doesn't stall */ | |
252 | mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); | |
253 | } | |
254 | ||
255 | return ret; | |
256 | } | |
257 | ||
7d12e780 | 258 | static void usbatm_complete(struct urb *urb) |
c59bba75 DS |
259 | { |
260 | struct usbatm_channel *channel = urb->context; | |
261 | unsigned long flags; | |
33fea2b2 | 262 | int status = urb->status; |
c59bba75 | 263 | |
34ad569f GKH |
264 | /* vdbg("%s: urb 0x%p, status %d, actual_length %d", |
265 | __func__, urb, status, urb->actual_length); */ | |
c59bba75 DS |
266 | |
267 | /* usually in_interrupt(), but not always */ | |
268 | spin_lock_irqsave(&channel->lock, flags); | |
269 | ||
270 | /* must add to the back when receiving; doesn't matter when sending */ | |
271 | list_add_tail(&urb->urb_list, &channel->list); | |
272 | ||
273 | spin_unlock_irqrestore(&channel->lock, flags); | |
274 | ||
33fea2b2 | 275 | if (unlikely(status) && |
a3673d3c | 276 | (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) || |
9196cc7b | 277 | status != -EILSEQ)) { |
33fea2b2 | 278 | if (status == -ESHUTDOWN) |
7d5e1dd4 SA |
279 | return; |
280 | ||
0ec3c7e8 DS |
281 | if (printk_ratelimit()) |
282 | atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n", | |
33fea2b2 | 283 | __func__, urb, status); |
c59bba75 DS |
284 | /* throttle processing in case of an error */ |
285 | mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); | |
0ec3c7e8 | 286 | } else |
c59bba75 DS |
287 | tasklet_schedule(&channel->tasklet); |
288 | } | |
289 | ||
290 | ||
291 | /************* | |
292 | ** decode ** | |
293 | *************/ | |
294 | ||
295 | static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance, | |
296 | short vpi, int vci) | |
297 | { | |
0ec3c7e8 | 298 | struct usbatm_vcc_data *vcc_data; |
c59bba75 | 299 | |
0ec3c7e8 DS |
300 | list_for_each_entry(vcc_data, &instance->vcc_list, list) |
301 | if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi)) | |
302 | return vcc_data; | |
c59bba75 DS |
303 | return NULL; |
304 | } | |
305 | ||
e3fb2f64 | 306 | static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source) |
c59bba75 | 307 | { |
c59bba75 DS |
308 | struct atm_vcc *vcc; |
309 | struct sk_buff *sarb; | |
e3fb2f64 DS |
310 | short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4); |
311 | int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4); | |
312 | u8 pti = ((source[3] & 0xe) >> 1); | |
c59bba75 | 313 | |
e3fb2f64 DS |
314 | if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) { |
315 | instance->cached_vpi = vpi; | |
316 | instance->cached_vci = vci; | |
c59bba75 | 317 | |
e3fb2f64 | 318 | instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci); |
e20d6645 | 319 | |
e3fb2f64 DS |
320 | if (!instance->cached_vcc) |
321 | atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci); | |
322 | } | |
e20d6645 | 323 | |
e3fb2f64 DS |
324 | if (!instance->cached_vcc) |
325 | return; | |
c59bba75 | 326 | |
e3fb2f64 | 327 | vcc = instance->cached_vcc->vcc; |
e20d6645 | 328 | |
e3fb2f64 DS |
329 | /* OAM F5 end-to-end */ |
330 | if (pti == ATM_PTI_E2EF5) { | |
331 | if (printk_ratelimit()) | |
332 | atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n", | |
333 | __func__, vpi, vci); | |
334 | atomic_inc(&vcc->stats->rx_err); | |
335 | return; | |
336 | } | |
c59bba75 | 337 | |
e3fb2f64 | 338 | sarb = instance->cached_vcc->sarb; |
c59bba75 | 339 | |
4305b541 | 340 | if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) { |
e3fb2f64 DS |
341 | atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n", |
342 | __func__, sarb->len, vcc); | |
343 | /* discard cells already received */ | |
344 | skb_trim(sarb, 0); | |
e3fb2f64 | 345 | } |
c59bba75 | 346 | |
27a884dc | 347 | memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD); |
e3fb2f64 | 348 | __skb_put(sarb, ATM_CELL_PAYLOAD); |
c59bba75 | 349 | |
e3fb2f64 DS |
350 | if (pti & 1) { |
351 | struct sk_buff *skb; | |
352 | unsigned int length; | |
353 | unsigned int pdu_length; | |
c59bba75 | 354 | |
e3fb2f64 | 355 | length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5]; |
c59bba75 | 356 | |
e3fb2f64 DS |
357 | /* guard against overflow */ |
358 | if (length > ATM_MAX_AAL5_PDU) { | |
359 | atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n", | |
360 | __func__, length, vcc); | |
361 | atomic_inc(&vcc->stats->rx_err); | |
362 | goto out; | |
363 | } | |
c59bba75 | 364 | |
e3fb2f64 | 365 | pdu_length = usbatm_pdu_length(length); |
c59bba75 | 366 | |
e3fb2f64 DS |
367 | if (sarb->len < pdu_length) { |
368 | atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n", | |
369 | __func__, pdu_length, sarb->len, vcc); | |
370 | atomic_inc(&vcc->stats->rx_err); | |
371 | goto out; | |
372 | } | |
c59bba75 | 373 | |
27a884dc | 374 | if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) { |
e3fb2f64 DS |
375 | atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n", |
376 | __func__, vcc); | |
377 | atomic_inc(&vcc->stats->rx_err); | |
378 | goto out; | |
379 | } | |
c59bba75 | 380 | |
34ad569f GKH |
381 | vdbg(&instance->usb_intf->dev, |
382 | "%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", | |
383 | __func__, length, pdu_length, vcc); | |
c59bba75 | 384 | |
f354c845 GKH |
385 | skb = dev_alloc_skb(length); |
386 | if (!skb) { | |
e3fb2f64 DS |
387 | if (printk_ratelimit()) |
388 | atm_err(instance, "%s: no memory for skb (length: %u)!\n", | |
389 | __func__, length); | |
390 | atomic_inc(&vcc->stats->rx_drop); | |
391 | goto out; | |
392 | } | |
c59bba75 | 393 | |
34ad569f GKH |
394 | vdbg(&instance->usb_intf->dev, |
395 | "%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", | |
396 | __func__, skb, skb->truesize); | |
c59bba75 | 397 | |
e3fb2f64 DS |
398 | if (!atm_charge(vcc, skb->truesize)) { |
399 | atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n", | |
400 | __func__, skb->truesize); | |
401 | dev_kfree_skb_any(skb); | |
402 | goto out; /* atm_charge increments rx_drop */ | |
403 | } | |
c59bba75 | 404 | |
27d7ff46 ACM |
405 | skb_copy_to_linear_data(skb, |
406 | skb_tail_pointer(sarb) - pdu_length, | |
407 | length); | |
e3fb2f64 | 408 | __skb_put(skb, length); |
c59bba75 | 409 | |
34ad569f GKH |
410 | vdbg(&instance->usb_intf->dev, |
411 | "%s: sending skb 0x%p, skb->len %u, skb->truesize %u", | |
e3fb2f64 | 412 | __func__, skb, skb->len, skb->truesize); |
c59bba75 | 413 | |
34ad569f | 414 | PACKETDEBUG(instance, skb->data, skb->len); |
c59bba75 | 415 | |
e3fb2f64 | 416 | vcc->push(vcc, skb); |
c59bba75 | 417 | |
e3fb2f64 DS |
418 | atomic_inc(&vcc->stats->rx); |
419 | out: | |
420 | skb_trim(sarb, 0); | |
421 | } | |
422 | } | |
c59bba75 | 423 | |
e3fb2f64 DS |
424 | static void usbatm_extract_cells(struct usbatm_data *instance, |
425 | unsigned char *source, unsigned int avail_data) | |
426 | { | |
427 | unsigned int stride = instance->rx_channel.stride; | |
428 | unsigned int buf_usage = instance->buf_usage; | |
429 | ||
430 | /* extract cells from incoming data, taking into account that | |
431 | * the length of avail data may not be a multiple of stride */ | |
432 | ||
433 | if (buf_usage > 0) { | |
434 | /* we have a partially received atm cell */ | |
435 | unsigned char *cell_buf = instance->cell_buf; | |
436 | unsigned int space_left = stride - buf_usage; | |
437 | ||
e3fb2f64 DS |
438 | if (avail_data >= space_left) { |
439 | /* add new data and process cell */ | |
440 | memcpy(cell_buf + buf_usage, source, space_left); | |
441 | source += space_left; | |
442 | avail_data -= space_left; | |
443 | usbatm_extract_one_cell(instance, cell_buf); | |
444 | instance->buf_usage = 0; | |
445 | } else { | |
446 | /* not enough data to fill the cell */ | |
447 | memcpy(cell_buf + buf_usage, source, avail_data); | |
448 | instance->buf_usage = buf_usage + avail_data; | |
449 | return; | |
c59bba75 DS |
450 | } |
451 | } | |
e3fb2f64 DS |
452 | |
453 | for (; avail_data >= stride; avail_data -= stride, source += stride) | |
454 | usbatm_extract_one_cell(instance, source); | |
455 | ||
456 | if (avail_data > 0) { | |
457 | /* length was not a multiple of stride - | |
458 | * save remaining data for next call */ | |
459 | memcpy(instance->cell_buf, source, avail_data); | |
460 | instance->buf_usage = avail_data; | |
461 | } | |
c59bba75 DS |
462 | } |
463 | ||
464 | ||
465 | /************* | |
466 | ** encode ** | |
467 | *************/ | |
468 | ||
469 | static unsigned int usbatm_write_cells(struct usbatm_data *instance, | |
470 | struct sk_buff *skb, | |
471 | u8 *target, unsigned int avail_space) | |
472 | { | |
473 | struct usbatm_control *ctrl = UDSL_SKB(skb); | |
474 | struct atm_vcc *vcc = ctrl->atm.vcc; | |
6f749475 | 475 | unsigned int bytes_written; |
c59bba75 DS |
476 | unsigned int stride = instance->tx_channel.stride; |
477 | ||
6f749475 DS |
478 | for (bytes_written = 0; bytes_written < avail_space && ctrl->len; |
479 | bytes_written += stride, target += stride) { | |
c59bba75 DS |
480 | unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD); |
481 | unsigned int left = ATM_CELL_PAYLOAD - data_len; | |
482 | u8 *ptr = target; | |
483 | ||
484 | ptr[0] = vcc->vpi >> 4; | |
485 | ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12); | |
486 | ptr[2] = vcc->vci >> 4; | |
487 | ptr[3] = vcc->vci << 4; | |
488 | ptr[4] = 0xec; | |
489 | ptr += ATM_CELL_HEADER; | |
490 | ||
d626f62b | 491 | skb_copy_from_linear_data(skb, ptr, data_len); |
c59bba75 DS |
492 | ptr += data_len; |
493 | __skb_pull(skb, data_len); | |
494 | ||
9196cc7b | 495 | if (!left) |
c59bba75 DS |
496 | continue; |
497 | ||
498 | memset(ptr, 0, left); | |
499 | ||
500 | if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */ | |
501 | u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER; | |
502 | /* trailer[0] = 0; UU = 0 */ | |
503 | /* trailer[1] = 0; CPI = 0 */ | |
504 | trailer[2] = ctrl->len >> 8; | |
505 | trailer[3] = ctrl->len; | |
506 | ||
9196cc7b | 507 | ctrl->crc = ~crc32_be(ctrl->crc, ptr, left - 4); |
c59bba75 DS |
508 | |
509 | trailer[4] = ctrl->crc >> 24; | |
510 | trailer[5] = ctrl->crc >> 16; | |
511 | trailer[6] = ctrl->crc >> 8; | |
512 | trailer[7] = ctrl->crc; | |
513 | ||
514 | target[3] |= 0x2; /* adjust PTI */ | |
515 | ||
516 | ctrl->len = 0; /* tag this skb finished */ | |
6c4b7f70 | 517 | } else |
c59bba75 DS |
518 | ctrl->crc = crc32_be(ctrl->crc, ptr, left); |
519 | } | |
520 | ||
6f749475 | 521 | return bytes_written; |
c59bba75 DS |
522 | } |
523 | ||
524 | ||
525 | /************** | |
526 | ** receive ** | |
527 | **************/ | |
528 | ||
529 | static void usbatm_rx_process(unsigned long data) | |
530 | { | |
531 | struct usbatm_data *instance = (struct usbatm_data *)data; | |
532 | struct urb *urb; | |
533 | ||
534 | while ((urb = usbatm_pop_urb(&instance->rx_channel))) { | |
34ad569f GKH |
535 | vdbg(&instance->usb_intf->dev, |
536 | "%s: processing urb 0x%p", __func__, urb); | |
c59bba75 DS |
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 | ||
e3fb2f64 DS |
548 | if (!merge_length) |
549 | merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; | |
550 | merge_length += actual_length; | |
551 | if (merge_length && (actual_length < packet_size)) { | |
552 | usbatm_extract_cells(instance, merge_start, merge_length); | |
553 | merge_length = 0; | |
554 | } | |
555 | } else { | |
556 | atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i); | |
557 | if (merge_length) | |
558 | usbatm_extract_cells(instance, merge_start, merge_length); | |
559 | merge_length = 0; | |
560 | instance->buf_usage = 0; | |
561 | } | |
562 | } | |
563 | ||
564 | if (merge_length) | |
565 | usbatm_extract_cells(instance, merge_start, merge_length); | |
566 | } else | |
c59bba75 DS |
567 | if (!urb->status) |
568 | usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length); | |
e3fb2f64 DS |
569 | else |
570 | instance->buf_usage = 0; | |
c59bba75 DS |
571 | |
572 | if (usbatm_submit_urb(urb)) | |
573 | return; | |
574 | } | |
575 | } | |
576 | ||
577 | ||
578 | /*********** | |
579 | ** send ** | |
580 | ***********/ | |
581 | ||
582 | static void usbatm_tx_process(unsigned long data) | |
583 | { | |
584 | struct usbatm_data *instance = (struct usbatm_data *)data; | |
585 | struct sk_buff *skb = instance->current_skb; | |
586 | struct urb *urb = NULL; | |
587 | const unsigned int buf_size = instance->tx_channel.buf_size; | |
6f749475 | 588 | unsigned int bytes_written = 0; |
c59bba75 DS |
589 | u8 *buffer = NULL; |
590 | ||
591 | if (!skb) | |
592 | skb = skb_dequeue(&instance->sndqueue); | |
593 | ||
594 | while (skb) { | |
595 | if (!urb) { | |
596 | urb = usbatm_pop_urb(&instance->tx_channel); | |
597 | if (!urb) | |
598 | break; /* no more senders */ | |
599 | buffer = urb->transfer_buffer; | |
6f749475 | 600 | bytes_written = (urb->status == -EAGAIN) ? |
c59bba75 DS |
601 | urb->transfer_buffer_length : 0; |
602 | } | |
603 | ||
6f749475 DS |
604 | bytes_written += usbatm_write_cells(instance, skb, |
605 | buffer + bytes_written, | |
606 | buf_size - bytes_written); | |
c59bba75 | 607 | |
34ad569f GKH |
608 | vdbg(&instance->usb_intf->dev, |
609 | "%s: wrote %u bytes from skb 0x%p to urb 0x%p", | |
6f749475 | 610 | __func__, bytes_written, skb, urb); |
c59bba75 DS |
611 | |
612 | if (!UDSL_SKB(skb)->len) { | |
613 | struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc; | |
614 | ||
615 | usbatm_pop(vcc, skb); | |
616 | atomic_inc(&vcc->stats->tx); | |
617 | ||
618 | skb = skb_dequeue(&instance->sndqueue); | |
619 | } | |
620 | ||
6f749475 DS |
621 | if (bytes_written == buf_size || (!skb && bytes_written)) { |
622 | urb->transfer_buffer_length = bytes_written; | |
c59bba75 DS |
623 | |
624 | if (usbatm_submit_urb(urb)) | |
625 | break; | |
626 | urb = NULL; | |
627 | } | |
628 | } | |
629 | ||
630 | instance->current_skb = skb; | |
631 | } | |
632 | ||
633 | static void usbatm_cancel_send(struct usbatm_data *instance, | |
634 | struct atm_vcc *vcc) | |
635 | { | |
636 | struct sk_buff *skb, *n; | |
637 | ||
c59bba75 | 638 | spin_lock_irq(&instance->sndqueue.lock); |
b5f61ab9 | 639 | skb_queue_walk_safe(&instance->sndqueue, skb, n) { |
c59bba75 DS |
640 | if (UDSL_SKB(skb)->atm.vcc == vcc) { |
641 | atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb); | |
642 | __skb_unlink(skb, &instance->sndqueue); | |
643 | usbatm_pop(vcc, skb); | |
644 | } | |
b5f61ab9 | 645 | } |
c59bba75 DS |
646 | spin_unlock_irq(&instance->sndqueue.lock); |
647 | ||
648 | tasklet_disable(&instance->tx_channel.tasklet); | |
649 | if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) { | |
650 | atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb); | |
651 | instance->current_skb = NULL; | |
652 | usbatm_pop(vcc, skb); | |
653 | } | |
654 | tasklet_enable(&instance->tx_channel.tasklet); | |
c59bba75 DS |
655 | } |
656 | ||
657 | static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) | |
658 | { | |
659 | struct usbatm_data *instance = vcc->dev->dev_data; | |
660 | struct usbatm_control *ctrl = UDSL_SKB(skb); | |
661 | int err; | |
662 | ||
0e42a627 DS |
663 | /* racy disconnection check - fine */ |
664 | if (!instance || instance->disconnected) { | |
2c21c985 | 665 | #ifdef VERBOSE_DEBUG |
bf929b3b | 666 | printk_ratelimited(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance"); |
0e42a627 | 667 | #endif |
c59bba75 DS |
668 | err = -ENODEV; |
669 | goto fail; | |
670 | } | |
671 | ||
672 | if (vcc->qos.aal != ATM_AAL5) { | |
0ec3c7e8 | 673 | atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); |
c59bba75 DS |
674 | err = -EINVAL; |
675 | goto fail; | |
676 | } | |
677 | ||
678 | if (skb->len > ATM_MAX_AAL5_PDU) { | |
0ec3c7e8 | 679 | atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n", |
c59bba75 DS |
680 | __func__, skb->len, ATM_MAX_AAL5_PDU); |
681 | err = -EINVAL; | |
682 | goto fail; | |
683 | } | |
684 | ||
34ad569f | 685 | PACKETDEBUG(instance, skb->data, skb->len); |
c59bba75 DS |
686 | |
687 | /* initialize the control block */ | |
688 | ctrl->atm.vcc = vcc; | |
689 | ctrl->len = skb->len; | |
690 | ctrl->crc = crc32_be(~0, skb->data, skb->len); | |
691 | ||
692 | skb_queue_tail(&instance->sndqueue, skb); | |
693 | tasklet_schedule(&instance->tx_channel.tasklet); | |
694 | ||
695 | return 0; | |
696 | ||
697 | fail: | |
698 | usbatm_pop(vcc, skb); | |
699 | return err; | |
700 | } | |
701 | ||
702 | ||
703 | /******************** | |
704 | ** bean counting ** | |
705 | ********************/ | |
706 | ||
707 | static void usbatm_destroy_instance(struct kref *kref) | |
708 | { | |
709 | struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount); | |
710 | ||
c59bba75 DS |
711 | tasklet_kill(&instance->rx_channel.tasklet); |
712 | tasklet_kill(&instance->tx_channel.tasklet); | |
713 | usb_put_dev(instance->usb_dev); | |
714 | kfree(instance); | |
715 | } | |
716 | ||
3d48586c | 717 | static void usbatm_get_instance(struct usbatm_data *instance) |
c59bba75 | 718 | { |
c59bba75 DS |
719 | kref_get(&instance->refcount); |
720 | } | |
721 | ||
3d48586c | 722 | static void usbatm_put_instance(struct usbatm_data *instance) |
c59bba75 | 723 | { |
c59bba75 DS |
724 | kref_put(&instance->refcount, usbatm_destroy_instance); |
725 | } | |
726 | ||
727 | ||
728 | /********** | |
729 | ** ATM ** | |
730 | **********/ | |
731 | ||
0ec3c7e8 | 732 | static void usbatm_atm_dev_close(struct atm_dev *atm_dev) |
c59bba75 | 733 | { |
0ec3c7e8 | 734 | struct usbatm_data *instance = atm_dev->dev_data; |
c59bba75 | 735 | |
c59bba75 DS |
736 | if (!instance) |
737 | return; | |
738 | ||
0ec3c7e8 | 739 | atm_dev->dev_data = NULL; /* catch bugs */ |
c59bba75 DS |
740 | usbatm_put_instance(instance); /* taken in usbatm_atm_init */ |
741 | } | |
742 | ||
9058bdc3 | 743 | static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t *pos, char *page) |
c59bba75 DS |
744 | { |
745 | struct usbatm_data *instance = atm_dev->dev_data; | |
746 | int left = *pos; | |
747 | ||
4c2a47a2 | 748 | if (!instance) |
c59bba75 | 749 | return -ENODEV; |
c59bba75 DS |
750 | |
751 | if (!left--) | |
752 | return sprintf(page, "%s\n", instance->description); | |
753 | ||
754 | if (!left--) | |
7c510e4b | 755 | return sprintf(page, "MAC: %pM\n", atm_dev->esi); |
c59bba75 DS |
756 | |
757 | if (!left--) | |
758 | return sprintf(page, | |
759 | "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n", | |
760 | atomic_read(&atm_dev->stats.aal5.tx), | |
761 | atomic_read(&atm_dev->stats.aal5.tx_err), | |
762 | atomic_read(&atm_dev->stats.aal5.rx), | |
763 | atomic_read(&atm_dev->stats.aal5.rx_err), | |
764 | atomic_read(&atm_dev->stats.aal5.rx_drop)); | |
765 | ||
0e42a627 DS |
766 | if (!left--) { |
767 | if (instance->disconnected) | |
768 | return sprintf(page, "Disconnected\n"); | |
769 | else | |
770 | switch (atm_dev->signal) { | |
771 | case ATM_PHY_SIG_FOUND: | |
772 | return sprintf(page, "Line up\n"); | |
773 | case ATM_PHY_SIG_LOST: | |
774 | return sprintf(page, "Line down\n"); | |
775 | default: | |
776 | return sprintf(page, "Line state unknown\n"); | |
777 | } | |
778 | } | |
c59bba75 DS |
779 | |
780 | return 0; | |
781 | } | |
782 | ||
783 | static int usbatm_atm_open(struct atm_vcc *vcc) | |
784 | { | |
785 | struct usbatm_data *instance = vcc->dev->dev_data; | |
786 | struct usbatm_vcc_data *new = NULL; | |
787 | int ret; | |
788 | int vci = vcc->vci; | |
789 | short vpi = vcc->vpi; | |
790 | ||
4c2a47a2 | 791 | if (!instance) |
c59bba75 | 792 | return -ENODEV; |
c59bba75 | 793 | |
c59bba75 | 794 | /* only support AAL5 */ |
0ec3c7e8 DS |
795 | if ((vcc->qos.aal != ATM_AAL5)) { |
796 | atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); | |
797 | return -EINVAL; | |
798 | } | |
799 | ||
800 | /* sanity checks */ | |
801 | if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) { | |
802 | atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu); | |
c59bba75 DS |
803 | return -EINVAL; |
804 | } | |
805 | ||
ab3c81ff | 806 | mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */ |
c59bba75 | 807 | |
0e42a627 DS |
808 | if (instance->disconnected) { |
809 | atm_dbg(instance, "%s: disconnected!\n", __func__); | |
810 | ret = -ENODEV; | |
811 | goto fail; | |
812 | } | |
813 | ||
c59bba75 DS |
814 | if (usbatm_find_vcc(instance, vpi, vci)) { |
815 | atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci); | |
816 | ret = -EADDRINUSE; | |
817 | goto fail; | |
818 | } | |
819 | ||
f354c845 GKH |
820 | new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL); |
821 | if (!new) { | |
0ec3c7e8 | 822 | atm_err(instance, "%s: no memory for vcc_data!\n", __func__); |
c59bba75 DS |
823 | ret = -ENOMEM; |
824 | goto fail; | |
825 | } | |
826 | ||
c59bba75 DS |
827 | new->vcc = vcc; |
828 | new->vpi = vpi; | |
829 | new->vci = vci; | |
830 | ||
831 | new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL); | |
832 | if (!new->sarb) { | |
0ec3c7e8 | 833 | atm_err(instance, "%s: no memory for SAR buffer!\n", __func__); |
c59bba75 DS |
834 | ret = -ENOMEM; |
835 | goto fail; | |
836 | } | |
837 | ||
838 | vcc->dev_data = new; | |
839 | ||
840 | tasklet_disable(&instance->rx_channel.tasklet); | |
e3fb2f64 DS |
841 | instance->cached_vcc = new; |
842 | instance->cached_vpi = vpi; | |
843 | instance->cached_vci = vci; | |
c59bba75 DS |
844 | list_add(&new->list, &instance->vcc_list); |
845 | tasklet_enable(&instance->rx_channel.tasklet); | |
846 | ||
847 | set_bit(ATM_VF_ADDR, &vcc->flags); | |
848 | set_bit(ATM_VF_PARTIAL, &vcc->flags); | |
849 | set_bit(ATM_VF_READY, &vcc->flags); | |
850 | ||
ab3c81ff | 851 | mutex_unlock(&instance->serialize); |
c59bba75 DS |
852 | |
853 | atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new); | |
854 | ||
855 | return 0; | |
856 | ||
857 | fail: | |
858 | kfree(new); | |
ab3c81ff | 859 | mutex_unlock(&instance->serialize); |
c59bba75 DS |
860 | return ret; |
861 | } | |
862 | ||
863 | static void usbatm_atm_close(struct atm_vcc *vcc) | |
864 | { | |
865 | struct usbatm_data *instance = vcc->dev->dev_data; | |
866 | struct usbatm_vcc_data *vcc_data = vcc->dev_data; | |
867 | ||
4c2a47a2 | 868 | if (!instance || !vcc_data) |
c59bba75 | 869 | return; |
c59bba75 | 870 | |
c59bba75 DS |
871 | usbatm_cancel_send(instance, vcc); |
872 | ||
ab3c81ff | 873 | mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */ |
c59bba75 DS |
874 | |
875 | tasklet_disable(&instance->rx_channel.tasklet); | |
e3fb2f64 DS |
876 | if (instance->cached_vcc == vcc_data) { |
877 | instance->cached_vcc = NULL; | |
878 | instance->cached_vpi = ATM_VPI_UNSPEC; | |
879 | instance->cached_vci = ATM_VCI_UNSPEC; | |
880 | } | |
c59bba75 DS |
881 | list_del(&vcc_data->list); |
882 | tasklet_enable(&instance->rx_channel.tasklet); | |
883 | ||
884 | kfree_skb(vcc_data->sarb); | |
885 | vcc_data->sarb = NULL; | |
886 | ||
887 | kfree(vcc_data); | |
888 | vcc->dev_data = NULL; | |
889 | ||
890 | vcc->vpi = ATM_VPI_UNSPEC; | |
891 | vcc->vci = ATM_VCI_UNSPEC; | |
892 | clear_bit(ATM_VF_READY, &vcc->flags); | |
893 | clear_bit(ATM_VF_PARTIAL, &vcc->flags); | |
894 | clear_bit(ATM_VF_ADDR, &vcc->flags); | |
895 | ||
ab3c81ff | 896 | mutex_unlock(&instance->serialize); |
c59bba75 DS |
897 | } |
898 | ||
0ec3c7e8 | 899 | static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, |
9058bdc3 | 900 | void __user *arg) |
c59bba75 | 901 | { |
0e42a627 DS |
902 | struct usbatm_data *instance = atm_dev->dev_data; |
903 | ||
4c2a47a2 | 904 | if (!instance || instance->disconnected) |
0e42a627 | 905 | return -ENODEV; |
0e42a627 | 906 | |
c59bba75 DS |
907 | switch (cmd) { |
908 | case ATM_QUERYLOOP: | |
909 | return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0; | |
910 | default: | |
911 | return -ENOIOCTLCMD; | |
912 | } | |
913 | } | |
914 | ||
915 | static int usbatm_atm_init(struct usbatm_data *instance) | |
916 | { | |
917 | struct atm_dev *atm_dev; | |
918 | int ret, i; | |
919 | ||
0ec3c7e8 DS |
920 | /* ATM init. The ATM initialization scheme suffers from an intrinsic race |
921 | * condition: callbacks we register can be executed at once, before we have | |
922 | * initialized the struct atm_dev. To protect against this, all callbacks | |
923 | * abort if atm_dev->dev_data is NULL. */ | |
d9ca676b DW |
924 | atm_dev = atm_dev_register(instance->driver_name, |
925 | &instance->usb_intf->dev, &usbatm_atm_devops, | |
926 | -1, NULL); | |
c59bba75 | 927 | if (!atm_dev) { |
0ec3c7e8 | 928 | usb_err(instance, "%s: failed to register ATM device!\n", __func__); |
c59bba75 DS |
929 | return -1; |
930 | } | |
931 | ||
932 | instance->atm_dev = atm_dev; | |
933 | ||
934 | atm_dev->ci_range.vpi_bits = ATM_CI_MAX; | |
935 | atm_dev->ci_range.vci_bits = ATM_CI_MAX; | |
936 | atm_dev->signal = ATM_PHY_SIG_UNKNOWN; | |
937 | ||
938 | /* temp init ATM device, set to 128kbit */ | |
939 | atm_dev->link_rate = 128 * 1000 / 424; | |
940 | ||
941 | if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) { | |
0ec3c7e8 | 942 | atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret); |
c59bba75 DS |
943 | goto fail; |
944 | } | |
945 | ||
c59bba75 | 946 | usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */ |
0ec3c7e8 DS |
947 | |
948 | /* ready for ATM callbacks */ | |
c59bba75 DS |
949 | mb(); |
950 | atm_dev->dev_data = instance; | |
951 | ||
952 | /* submit all rx URBs */ | |
953 | for (i = 0; i < num_rcv_urbs; i++) | |
954 | usbatm_submit_urb(instance->urbs[i]); | |
955 | ||
956 | return 0; | |
957 | ||
958 | fail: | |
959 | instance->atm_dev = NULL; | |
64bf69dd | 960 | atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */ |
c59bba75 DS |
961 | return ret; |
962 | } | |
963 | ||
964 | ||
965 | /********** | |
966 | ** USB ** | |
967 | **********/ | |
968 | ||
969 | static int usbatm_do_heavy_init(void *arg) | |
970 | { | |
971 | struct usbatm_data *instance = arg; | |
972 | int ret; | |
973 | ||
c59bba75 | 974 | allow_signal(SIGTERM); |
c59bba75 DS |
975 | complete(&instance->thread_started); |
976 | ||
977 | ret = instance->driver->heavy_init(instance, instance->usb_intf); | |
978 | ||
979 | if (!ret) | |
980 | ret = usbatm_atm_init(instance); | |
981 | ||
ab3c81ff | 982 | mutex_lock(&instance->serialize); |
c4504a7e | 983 | instance->thread = NULL; |
ab3c81ff | 984 | mutex_unlock(&instance->serialize); |
c59bba75 DS |
985 | |
986 | complete_and_exit(&instance->thread_exited, ret); | |
987 | } | |
988 | ||
989 | static int usbatm_heavy_init(struct usbatm_data *instance) | |
990 | { | |
c4504a7e PE |
991 | struct task_struct *t; |
992 | ||
f170168b | 993 | t = kthread_create(usbatm_do_heavy_init, instance, "%s", |
c4504a7e PE |
994 | instance->driver->driver_name); |
995 | if (IS_ERR(t)) { | |
996 | usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n", | |
997 | __func__, PTR_ERR(t)); | |
998 | return PTR_ERR(t); | |
c59bba75 DS |
999 | } |
1000 | ||
c4504a7e PE |
1001 | instance->thread = t; |
1002 | wake_up_process(t); | |
c59bba75 DS |
1003 | wait_for_completion(&instance->thread_started); |
1004 | ||
1005 | return 0; | |
1006 | } | |
1007 | ||
1008 | static void usbatm_tasklet_schedule(unsigned long data) | |
1009 | { | |
1010 | tasklet_schedule((struct tasklet_struct *) data); | |
1011 | } | |
1012 | ||
fcf4830a | 1013 | static void usbatm_init_channel(struct usbatm_channel *channel) |
c59bba75 DS |
1014 | { |
1015 | spin_lock_init(&channel->lock); | |
1016 | INIT_LIST_HEAD(&channel->list); | |
1017 | channel->delay.function = usbatm_tasklet_schedule; | |
1018 | channel->delay.data = (unsigned long) &channel->tasklet; | |
1019 | init_timer(&channel->delay); | |
1020 | } | |
1021 | ||
1022 | int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, | |
1023 | struct usbatm_driver *driver) | |
1024 | { | |
1025 | struct device *dev = &intf->dev; | |
1026 | struct usb_device *usb_dev = interface_to_usbdev(intf); | |
1027 | struct usbatm_data *instance; | |
1028 | char *buf; | |
1029 | int error = -ENOMEM; | |
1030 | int i, length; | |
6f749475 | 1031 | unsigned int maxpacket, num_packets; |
c59bba75 | 1032 | |
c59bba75 | 1033 | /* instance init */ |
7b842b6e | 1034 | instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL); |
c59bba75 | 1035 | if (!instance) { |
0ec3c7e8 | 1036 | dev_err(dev, "%s: no memory for instance data!\n", __func__); |
c59bba75 DS |
1037 | return -ENOMEM; |
1038 | } | |
1039 | ||
c59bba75 DS |
1040 | /* public fields */ |
1041 | ||
1042 | instance->driver = driver; | |
f170168b KC |
1043 | strlcpy(instance->driver_name, driver->driver_name, |
1044 | sizeof(instance->driver_name)); | |
c59bba75 DS |
1045 | |
1046 | instance->usb_dev = usb_dev; | |
1047 | instance->usb_intf = intf; | |
1048 | ||
1049 | buf = instance->description; | |
1050 | length = sizeof(instance->description); | |
1051 | ||
1052 | if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0) | |
1053 | goto bind; | |
1054 | ||
1055 | buf += i; | |
1056 | length -= i; | |
1057 | ||
1058 | i = scnprintf(buf, length, " ("); | |
1059 | buf += i; | |
1060 | length -= i; | |
1061 | ||
1062 | if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0) | |
1063 | goto bind; | |
1064 | ||
1065 | buf += i; | |
1066 | length -= i; | |
1067 | ||
1068 | snprintf(buf, length, ")"); | |
1069 | ||
1070 | bind: | |
35644b0c | 1071 | if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) { |
0ec3c7e8 | 1072 | dev_err(dev, "%s: bind failed: %d!\n", __func__, error); |
c59bba75 DS |
1073 | goto fail_free; |
1074 | } | |
1075 | ||
1076 | /* private fields */ | |
1077 | ||
1078 | kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */ | |
ab3c81ff | 1079 | mutex_init(&instance->serialize); |
c59bba75 | 1080 | |
c4504a7e | 1081 | instance->thread = NULL; |
c59bba75 DS |
1082 | init_completion(&instance->thread_started); |
1083 | init_completion(&instance->thread_exited); | |
1084 | ||
1085 | INIT_LIST_HEAD(&instance->vcc_list); | |
80aae7a1 | 1086 | skb_queue_head_init(&instance->sndqueue); |
c59bba75 DS |
1087 | |
1088 | usbatm_init_channel(&instance->rx_channel); | |
1089 | usbatm_init_channel(&instance->tx_channel); | |
1090 | tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance); | |
1091 | tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance); | |
c59bba75 DS |
1092 | instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding; |
1093 | instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding; | |
c59bba75 DS |
1094 | instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance; |
1095 | ||
80aae7a1 DS |
1096 | if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in) |
1097 | instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in); | |
1098 | else | |
1099 | instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in); | |
1100 | ||
1101 | instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out); | |
1102 | ||
6f749475 | 1103 | /* tx buffer size must be a positive multiple of the stride */ |
9196cc7b | 1104 | instance->tx_channel.buf_size = max(instance->tx_channel.stride, |
6f749475 DS |
1105 | snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride)); |
1106 | ||
1107 | /* rx buffer size must be a positive multiple of the endpoint maxpacket */ | |
1108 | maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0); | |
1109 | ||
1110 | if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) { | |
1111 | dev_err(dev, "%s: invalid endpoint %02x!\n", __func__, | |
1112 | usb_pipeendpoint(instance->rx_channel.endpoint)); | |
1113 | error = -EINVAL; | |
1114 | goto fail_unbind; | |
1115 | } | |
1116 | ||
9196cc7b | 1117 | num_packets = max(1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */ |
6f749475 DS |
1118 | |
1119 | if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE) | |
1120 | num_packets--; | |
1121 | ||
1122 | instance->rx_channel.buf_size = num_packets * maxpacket; | |
80aae7a1 | 1123 | instance->rx_channel.packet_size = maxpacket; |
6f749475 | 1124 | |
6f749475 DS |
1125 | for (i = 0; i < 2; i++) { |
1126 | struct usbatm_channel *channel = i ? | |
1127 | &instance->tx_channel : &instance->rx_channel; | |
1128 | ||
2c21c985 GKH |
1129 | dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", |
1130 | __func__, channel->buf_size, i ? "tx" : "rx", channel); | |
6f749475 | 1131 | } |
6f749475 | 1132 | |
80aae7a1 | 1133 | /* initialize urbs */ |
c59bba75 DS |
1134 | |
1135 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { | |
c59bba75 | 1136 | u8 *buffer; |
c59bba75 DS |
1137 | struct usbatm_channel *channel = i < num_rcv_urbs ? |
1138 | &instance->rx_channel : &instance->tx_channel; | |
80aae7a1 DS |
1139 | struct urb *urb; |
1140 | unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0; | |
c59bba75 | 1141 | |
c59bba75 DS |
1142 | urb = usb_alloc_urb(iso_packets, GFP_KERNEL); |
1143 | if (!urb) { | |
0ec3c7e8 | 1144 | dev_err(dev, "%s: no memory for urb %d!\n", __func__, i); |
72ef8ab4 | 1145 | error = -ENOMEM; |
c59bba75 DS |
1146 | goto fail_unbind; |
1147 | } | |
1148 | ||
65412e48 DS |
1149 | instance->urbs[i] = urb; |
1150 | ||
9a734efe DS |
1151 | /* zero the tx padding to avoid leaking information */ |
1152 | buffer = kzalloc(channel->buf_size, GFP_KERNEL); | |
c59bba75 | 1153 | if (!buffer) { |
0ec3c7e8 | 1154 | dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i); |
72ef8ab4 | 1155 | error = -ENOMEM; |
c59bba75 DS |
1156 | goto fail_unbind; |
1157 | } | |
c59bba75 DS |
1158 | |
1159 | usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint, | |
1160 | buffer, channel->buf_size, usbatm_complete, channel); | |
1161 | if (iso_packets) { | |
1162 | int j; | |
1163 | urb->interval = 1; | |
1164 | urb->transfer_flags = URB_ISO_ASAP; | |
1165 | urb->number_of_packets = iso_packets; | |
1166 | for (j = 0; j < iso_packets; j++) { | |
80aae7a1 DS |
1167 | urb->iso_frame_desc[j].offset = channel->packet_size * j; |
1168 | urb->iso_frame_desc[j].length = channel->packet_size; | |
c59bba75 DS |
1169 | } |
1170 | } | |
1171 | ||
1172 | /* put all tx URBs on the list of spares */ | |
1173 | if (i >= num_rcv_urbs) | |
1174 | list_add_tail(&urb->urb_list, &channel->list); | |
1175 | ||
34ad569f | 1176 | vdbg(&intf->dev, "%s: alloced buffer 0x%p buf size %u urb 0x%p", |
c59bba75 | 1177 | __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb); |
c59bba75 DS |
1178 | } |
1179 | ||
e3fb2f64 DS |
1180 | instance->cached_vpi = ATM_VPI_UNSPEC; |
1181 | instance->cached_vci = ATM_VCI_UNSPEC; | |
1182 | instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL); | |
1183 | ||
1184 | if (!instance->cell_buf) { | |
1185 | dev_err(dev, "%s: no memory for cell buffer!\n", __func__); | |
1186 | error = -ENOMEM; | |
1187 | goto fail_unbind; | |
1188 | } | |
1189 | ||
35644b0c | 1190 | if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) { |
c59bba75 DS |
1191 | error = usbatm_heavy_init(instance); |
1192 | } else { | |
1193 | complete(&instance->thread_exited); /* pretend that heavy_init was run */ | |
1194 | error = usbatm_atm_init(instance); | |
1195 | } | |
1196 | ||
1197 | if (error < 0) | |
1198 | goto fail_unbind; | |
1199 | ||
1200 | usb_get_dev(usb_dev); | |
1201 | usb_set_intfdata(intf, instance); | |
1202 | ||
1203 | return 0; | |
1204 | ||
1205 | fail_unbind: | |
1206 | if (instance->driver->unbind) | |
1207 | instance->driver->unbind(instance, intf); | |
1208 | fail_free: | |
e3fb2f64 DS |
1209 | kfree(instance->cell_buf); |
1210 | ||
c59bba75 DS |
1211 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { |
1212 | if (instance->urbs[i]) | |
1213 | kfree(instance->urbs[i]->transfer_buffer); | |
1214 | usb_free_urb(instance->urbs[i]); | |
1215 | } | |
1216 | ||
9196cc7b | 1217 | kfree(instance); |
c59bba75 DS |
1218 | |
1219 | return error; | |
1220 | } | |
1221 | EXPORT_SYMBOL_GPL(usbatm_usb_probe); | |
1222 | ||
1223 | void usbatm_usb_disconnect(struct usb_interface *intf) | |
1224 | { | |
1225 | struct device *dev = &intf->dev; | |
1226 | struct usbatm_data *instance = usb_get_intfdata(intf); | |
0e42a627 | 1227 | struct usbatm_vcc_data *vcc_data; |
c59bba75 DS |
1228 | int i; |
1229 | ||
c59bba75 DS |
1230 | if (!instance) { |
1231 | dev_dbg(dev, "%s: NULL instance!\n", __func__); | |
1232 | return; | |
1233 | } | |
1234 | ||
1235 | usb_set_intfdata(intf, NULL); | |
1236 | ||
ab3c81ff | 1237 | mutex_lock(&instance->serialize); |
0e42a627 | 1238 | instance->disconnected = 1; |
c4504a7e PE |
1239 | if (instance->thread != NULL) |
1240 | send_sig(SIGTERM, instance->thread, 1); | |
ab3c81ff | 1241 | mutex_unlock(&instance->serialize); |
c59bba75 DS |
1242 | |
1243 | wait_for_completion(&instance->thread_exited); | |
1244 | ||
ab3c81ff | 1245 | mutex_lock(&instance->serialize); |
0e42a627 DS |
1246 | list_for_each_entry(vcc_data, &instance->vcc_list, list) |
1247 | vcc_release_async(vcc_data->vcc, -EPIPE); | |
ab3c81ff | 1248 | mutex_unlock(&instance->serialize); |
0e42a627 | 1249 | |
c59bba75 DS |
1250 | tasklet_disable(&instance->rx_channel.tasklet); |
1251 | tasklet_disable(&instance->tx_channel.tasklet); | |
1252 | ||
1253 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) | |
1254 | usb_kill_urb(instance->urbs[i]); | |
1255 | ||
1256 | del_timer_sync(&instance->rx_channel.delay); | |
1257 | del_timer_sync(&instance->tx_channel.delay); | |
1258 | ||
0e42a627 DS |
1259 | /* turn usbatm_[rt]x_process into something close to a no-op */ |
1260 | /* no need to take the spinlock */ | |
1261 | INIT_LIST_HEAD(&instance->rx_channel.list); | |
1262 | INIT_LIST_HEAD(&instance->tx_channel.list); | |
1263 | ||
1264 | tasklet_enable(&instance->rx_channel.tasklet); | |
1265 | tasklet_enable(&instance->tx_channel.tasklet); | |
1266 | ||
c59bba75 DS |
1267 | if (instance->atm_dev && instance->driver->atm_stop) |
1268 | instance->driver->atm_stop(instance, instance->atm_dev); | |
1269 | ||
1270 | if (instance->driver->unbind) | |
1271 | instance->driver->unbind(instance, intf); | |
1272 | ||
1273 | instance->driver_data = NULL; | |
1274 | ||
c59bba75 DS |
1275 | for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { |
1276 | kfree(instance->urbs[i]->transfer_buffer); | |
1277 | usb_free_urb(instance->urbs[i]); | |
1278 | } | |
1279 | ||
e3fb2f64 DS |
1280 | kfree(instance->cell_buf); |
1281 | ||
c59bba75 | 1282 | /* ATM finalize */ |
e9b8daf3 | 1283 | if (instance->atm_dev) { |
64bf69dd | 1284 | atm_dev_deregister(instance->atm_dev); |
9fc950d3 | 1285 | instance->atm_dev = NULL; |
e9b8daf3 | 1286 | } |
c59bba75 DS |
1287 | |
1288 | usbatm_put_instance(instance); /* taken in usbatm_usb_probe */ | |
1289 | } | |
1290 | EXPORT_SYMBOL_GPL(usbatm_usb_disconnect); | |
1291 | ||
1292 | ||
1293 | /*********** | |
1294 | ** init ** | |
1295 | ***********/ | |
1296 | ||
1297 | static int __init usbatm_usb_init(void) | |
1298 | { | |
08add0c7 | 1299 | if (sizeof(struct usbatm_control) > FIELD_SIZEOF(struct sk_buff, cb)) { |
c59bba75 DS |
1300 | printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name); |
1301 | return -EIO; | |
1302 | } | |
1303 | ||
1304 | if ((num_rcv_urbs > UDSL_MAX_RCV_URBS) | |
1305 | || (num_snd_urbs > UDSL_MAX_SND_URBS) | |
6f749475 DS |
1306 | || (rcv_buf_bytes < 1) |
1307 | || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE) | |
1308 | || (snd_buf_bytes < 1) | |
1309 | || (snd_buf_bytes > UDSL_MAX_BUF_SIZE)) | |
c59bba75 DS |
1310 | return -EINVAL; |
1311 | ||
1312 | return 0; | |
1313 | } | |
1314 | module_init(usbatm_usb_init); | |
1315 | ||
1316 | static void __exit usbatm_usb_exit(void) | |
1317 | { | |
c59bba75 DS |
1318 | } |
1319 | module_exit(usbatm_usb_exit); | |
1320 | ||
1321 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
1322 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1323 | MODULE_LICENSE("GPL"); | |
1324 | MODULE_VERSION(DRIVER_VERSION); | |
1325 | ||
1326 | /************ | |
1327 | ** debug ** | |
1328 | ************/ | |
1329 | ||
1330 | #ifdef VERBOSE_DEBUG | |
34ad569f GKH |
1331 | static int usbatm_print_packet(struct usbatm_data *instance, |
1332 | const unsigned char *data, int len) | |
c59bba75 DS |
1333 | { |
1334 | unsigned char buffer[256]; | |
1335 | int i = 0, j = 0; | |
1336 | ||
1337 | for (i = 0; i < len;) { | |
1338 | buffer[0] = '\0'; | |
1339 | sprintf(buffer, "%.3d :", i); | |
6c4b7f70 | 1340 | for (j = 0; (j < 16) && (i < len); j++, i++) |
c59bba75 | 1341 | sprintf(buffer, "%s %2.2x", buffer, data[i]); |
34ad569f | 1342 | dev_dbg(&instance->usb_intf->dev, "%s", buffer); |
c59bba75 DS |
1343 | } |
1344 | return i; | |
1345 | } | |
1346 | #endif |