blob: 9b53e8df464814a05b74fbef822d57554a11ce8e [file] [log] [blame]
Duncan Sandsc59bba72005-05-11 20:24:03 +02001/******************************************************************************
2 * usbatm.c - Generic USB xDSL driver core
3 *
4 * Copyright (C) 2001, Alcatel
5 * Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
6 * Copyright (C) 2004, David Woodhouse, Roman Kagan
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
11 * any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along with
19 * this program; if not, write to the Free Software Foundation, Inc., 59
20 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 *
22 ******************************************************************************/
23
24/*
25 * Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse
26 *
27 * 1.7+: - See the check-in logs
28 *
29 * 1.6: - No longer opens a connection if the firmware is not loaded
30 * - Added support for the speedtouch 330
31 * - Removed the limit on the number of devices
32 * - Module now autoloads on device plugin
33 * - Merged relevant parts of sarlib
34 * - Replaced the kernel thread with a tasklet
35 * - New packet transmission code
36 * - Changed proc file contents
37 * - Fixed all known SMP races
38 * - Many fixes and cleanups
39 * - Various fixes by Oliver Neukum (oliver@neukum.name)
40 *
41 * 1.5A: - Version for inclusion in 2.5 series kernel
42 * - Modifications by Richard Purdie (rpurdie@rpsys.net)
43 * - made compatible with kernel 2.5.6 onwards by changing
44 * usbatm_usb_send_data_context->urb to a pointer and adding code
45 * to alloc and free it
46 * - remove_wait_queue() added to usbatm_atm_processqueue_thread()
47 *
48 * 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL.
49 * (reported by stephen.robinson@zen.co.uk)
50 *
51 * 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave()
52 * - unlink all active send urbs of a vcc that is being closed.
53 *
54 * 1.3.1: - added the version number
55 *
56 * 1.3: - Added multiple send urb support
57 * - fixed memory leak and vcc->tx_inuse starvation bug
58 * when not enough memory left in vcc.
59 *
60 * 1.2: - Fixed race condition in usbatm_usb_send_data()
61 * 1.1: - Turned off packet debugging
62 *
63 */
64
65#include "usbatm.h"
66
67#include <asm/uaccess.h>
68#include <linux/crc32.h>
69#include <linux/errno.h>
70#include <linux/init.h>
71#include <linux/interrupt.h>
72#include <linux/kernel.h>
73#include <linux/module.h>
74#include <linux/moduleparam.h>
Duncan Sands227d7762006-01-13 10:13:19 +010075#include <linux/netdevice.h>
Duncan Sandsc59bba72005-05-11 20:24:03 +020076#include <linux/proc_fs.h>
77#include <linux/sched.h>
78#include <linux/signal.h>
79#include <linux/slab.h>
Duncan Sandsc59bba72005-05-11 20:24:03 +020080#include <linux/stat.h>
81#include <linux/timer.h>
82#include <linux/wait.h>
Pavel Emelyanovc4504a72008-02-11 15:26:09 +030083#include <linux/kthread.h>
Duncan Sandsc59bba72005-05-11 20:24:03 +020084
85#ifdef VERBOSE_DEBUG
86static int usbatm_print_packet(const unsigned char *data, int len);
87#define PACKETDEBUG(arg...) usbatm_print_packet (arg)
88#define vdbg(arg...) dbg (arg)
89#else
90#define PACKETDEBUG(arg...)
91#define vdbg(arg...)
92#endif
93
94#define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
Duncan Sands9b0e54a2006-01-13 11:08:05 +010095#define DRIVER_VERSION "1.10"
Duncan Sandsc59bba72005-05-11 20:24:03 +020096#define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
97
98static const char usbatm_driver_name[] = "usbatm";
99
100#define UDSL_MAX_RCV_URBS 16
101#define UDSL_MAX_SND_URBS 16
Duncan Sands6275cdf2006-04-28 18:52:16 +0200102#define UDSL_MAX_BUF_SIZE 65536
Duncan Sandsc59bba72005-05-11 20:24:03 +0200103#define UDSL_DEFAULT_RCV_URBS 4
104#define UDSL_DEFAULT_SND_URBS 4
Duncan Sands6275cdf2006-04-28 18:52:16 +0200105#define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
106#define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
Duncan Sandsc59bba72005-05-11 20:24:03 +0200107
108#define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
109
110#define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */
111
112static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
113static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
Duncan Sands6f749472006-01-13 10:52:38 +0100114static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
115static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200116
117module_param(num_rcv_urbs, uint, S_IRUGO);
118MODULE_PARM_DESC(num_rcv_urbs,
119 "Number of urbs used for reception (range: 0-"
120 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
121 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
122
123module_param(num_snd_urbs, uint, S_IRUGO);
124MODULE_PARM_DESC(num_snd_urbs,
125 "Number of urbs used for transmission (range: 0-"
126 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
127 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
128
Duncan Sands6f749472006-01-13 10:52:38 +0100129module_param(rcv_buf_bytes, uint, S_IRUGO);
130MODULE_PARM_DESC(rcv_buf_bytes,
131 "Size of the buffers used for reception, in bytes (range: 1-"
132 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
Duncan Sandsc59bba72005-05-11 20:24:03 +0200133 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
134
Duncan Sands6f749472006-01-13 10:52:38 +0100135module_param(snd_buf_bytes, uint, S_IRUGO);
136MODULE_PARM_DESC(snd_buf_bytes,
137 "Size of the buffers used for transmission, in bytes (range: 1-"
Duncan Sands6275cdf2006-04-28 18:52:16 +0200138 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
Duncan Sandsc59bba72005-05-11 20:24:03 +0200139 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
140
141
142/* receive */
143
144struct usbatm_vcc_data {
145 /* vpi/vci lookup */
146 struct list_head list;
147 short vpi;
148 int vci;
149 struct atm_vcc *vcc;
150
151 /* raw cell reassembly */
152 struct sk_buff *sarb;
153};
154
155
156/* send */
157
158struct usbatm_control {
159 struct atm_skb_data atm;
160 u32 len;
161 u32 crc;
162};
163
164#define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb)
165
166
167/* ATM */
168
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100169static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200170static int usbatm_atm_open(struct atm_vcc *vcc);
171static void usbatm_atm_close(struct atm_vcc *vcc);
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100172static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200173static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
174static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
175
176static struct atmdev_ops usbatm_atm_devops = {
177 .dev_close = usbatm_atm_dev_close,
178 .open = usbatm_atm_open,
179 .close = usbatm_atm_close,
180 .ioctl = usbatm_atm_ioctl,
181 .send = usbatm_atm_send,
182 .proc_read = usbatm_atm_proc_read,
183 .owner = THIS_MODULE,
184};
185
186
187/***********
188** misc **
189***********/
190
191static inline unsigned int usbatm_pdu_length(unsigned int length)
192{
193 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
194 return length - length % ATM_CELL_PAYLOAD;
195}
196
197static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
198{
199 if (vcc->pop)
200 vcc->pop(vcc, skb);
201 else
Duncan Sands227d7762006-01-13 10:13:19 +0100202 dev_kfree_skb_any(skb);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200203}
204
205
206/***********
207** urbs **
208************/
209
Arjan van de Ven858119e2006-01-14 13:20:43 -0800210static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200211{
212 struct urb *urb;
213
214 spin_lock_irq(&channel->lock);
215 if (list_empty(&channel->list)) {
216 spin_unlock_irq(&channel->lock);
217 return NULL;
218 }
219
220 urb = list_entry(channel->list.next, struct urb, urb_list);
221 list_del(&urb->urb_list);
222 spin_unlock_irq(&channel->lock);
223
224 return urb;
225}
226
Arjan van de Ven858119e2006-01-14 13:20:43 -0800227static int usbatm_submit_urb(struct urb *urb)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200228{
229 struct usbatm_channel *channel = urb->context;
230 int ret;
231
232 vdbg("%s: submitting urb 0x%p, size %u",
233 __func__, urb, urb->transfer_buffer_length);
234
235 ret = usb_submit_urb(urb, GFP_ATOMIC);
236 if (ret) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100237 if (printk_ratelimit())
238 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
239 __func__, urb, ret);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200240
241 /* consider all errors transient and return the buffer back to the queue */
242 urb->status = -EAGAIN;
243 spin_lock_irq(&channel->lock);
244
245 /* must add to the front when sending; doesn't matter when receiving */
246 list_add(&urb->urb_list, &channel->list);
247
248 spin_unlock_irq(&channel->lock);
249
250 /* make sure the channel doesn't stall */
251 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
252 }
253
254 return ret;
255}
256
David Howells7d12e782006-10-05 14:55:46 +0100257static void usbatm_complete(struct urb *urb)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200258{
259 struct usbatm_channel *channel = urb->context;
260 unsigned long flags;
Greg Kroah-Hartman33fea2b2007-07-18 10:58:02 -0700261 int status = urb->status;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200262
263 vdbg("%s: urb 0x%p, status %d, actual_length %d",
Greg Kroah-Hartman33fea2b2007-07-18 10:58:02 -0700264 __func__, urb, status, urb->actual_length);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200265
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
Greg Kroah-Hartman33fea2b2007-07-18 10:58:02 -0700274 if (unlikely(status) &&
Duncan Sandsa3673d32006-01-13 11:12:58 +0100275 (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
Greg Kroah-Hartman33fea2b2007-07-18 10:58:02 -0700276 status != -EILSEQ ))
Duncan Sandsa3673d32006-01-13 11:12:58 +0100277 {
Greg Kroah-Hartman33fea2b2007-07-18 10:58:02 -0700278 if (status == -ESHUTDOWN)
Simon Arlott7d5e1dd2007-04-26 00:38:04 -0700279 return;
280
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100281 if (printk_ratelimit())
282 atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
Greg Kroah-Hartman33fea2b2007-07-18 10:58:02 -0700283 __func__, urb, status);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200284 /* throttle processing in case of an error */
285 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100286 } else
Duncan Sandsc59bba72005-05-11 20:24:03 +0200287 tasklet_schedule(&channel->tasklet);
288}
289
290
291/*************
292** decode **
293*************/
294
295static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
296 short vpi, int vci)
297{
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100298 struct usbatm_vcc_data *vcc_data;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200299
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100300 list_for_each_entry(vcc_data, &instance->vcc_list, list)
301 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
302 return vcc_data;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200303 return NULL;
304}
305
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100306static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200307{
Duncan Sandsc59bba72005-05-11 20:24:03 +0200308 struct atm_vcc *vcc;
309 struct sk_buff *sarb;
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100310 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);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200313
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100314 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200315
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100316 if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
317 instance->cached_vpi = vpi;
318 instance->cached_vci = vci;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200319
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100320 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
Duncan Sandse20d6642005-05-26 14:32:51 +0200321
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100322 if (!instance->cached_vcc)
323 atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
324 }
Duncan Sandse20d6642005-05-26 14:32:51 +0200325
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100326 if (!instance->cached_vcc)
327 return;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200328
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100329 vcc = instance->cached_vcc->vcc;
Duncan Sandse20d6642005-05-26 14:32:51 +0200330
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100331 /* OAM F5 end-to-end */
332 if (pti == ATM_PTI_E2EF5) {
333 if (printk_ratelimit())
334 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
335 __func__, vpi, vci);
336 atomic_inc(&vcc->stats->rx_err);
337 return;
338 }
Duncan Sandsc59bba72005-05-11 20:24:03 +0200339
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100340 sarb = instance->cached_vcc->sarb;
341
Arnaldo Carvalho de Melo4305b542007-04-19 20:43:29 -0700342 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100343 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
344 __func__, sarb->len, vcc);
345 /* discard cells already received */
346 skb_trim(sarb, 0);
Greg Kroah-Hartman3b6004f2008-08-14 09:37:34 -0700347 UDSL_ASSERT(instance, sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100348 }
349
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700350 memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100351 __skb_put(sarb, ATM_CELL_PAYLOAD);
352
353 if (pti & 1) {
354 struct sk_buff *skb;
355 unsigned int length;
356 unsigned int pdu_length;
357
358 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
359
360 /* guard against overflow */
361 if (length > ATM_MAX_AAL5_PDU) {
362 atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
363 __func__, length, vcc);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200364 atomic_inc(&vcc->stats->rx_err);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100365 goto out;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200366 }
367
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100368 pdu_length = usbatm_pdu_length(length);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200369
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100370 if (sarb->len < pdu_length) {
371 atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
372 __func__, pdu_length, sarb->len, vcc);
373 atomic_inc(&vcc->stats->rx_err);
374 goto out;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200375 }
376
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700377 if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) {
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100378 atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
379 __func__, vcc);
380 atomic_inc(&vcc->stats->rx_err);
381 goto out;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200382 }
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100383
384 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
385
386 if (!(skb = dev_alloc_skb(length))) {
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 }
393
394 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
395
396 if (!atm_charge(vcc, skb->truesize)) {
397 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
398 __func__, skb->truesize);
399 dev_kfree_skb_any(skb);
400 goto out; /* atm_charge increments rx_drop */
401 }
402
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -0300403 skb_copy_to_linear_data(skb,
404 skb_tail_pointer(sarb) - pdu_length,
405 length);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100406 __skb_put(skb, length);
407
408 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
409 __func__, skb, skb->len, skb->truesize);
410
411 PACKETDEBUG(skb->data, skb->len);
412
413 vcc->push(vcc, skb);
414
415 atomic_inc(&vcc->stats->rx);
416 out:
417 skb_trim(sarb, 0);
418 }
419}
420
421static void usbatm_extract_cells(struct usbatm_data *instance,
422 unsigned char *source, unsigned int avail_data)
423{
424 unsigned int stride = instance->rx_channel.stride;
425 unsigned int buf_usage = instance->buf_usage;
426
427 /* extract cells from incoming data, taking into account that
428 * the length of avail data may not be a multiple of stride */
429
430 if (buf_usage > 0) {
431 /* we have a partially received atm cell */
432 unsigned char *cell_buf = instance->cell_buf;
433 unsigned int space_left = stride - buf_usage;
434
Greg Kroah-Hartman3b6004f2008-08-14 09:37:34 -0700435 UDSL_ASSERT(instance, buf_usage <= stride);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100436
437 if (avail_data >= space_left) {
438 /* add new data and process cell */
439 memcpy(cell_buf + buf_usage, source, space_left);
440 source += space_left;
441 avail_data -= space_left;
442 usbatm_extract_one_cell(instance, cell_buf);
443 instance->buf_usage = 0;
444 } else {
445 /* not enough data to fill the cell */
446 memcpy(cell_buf + buf_usage, source, avail_data);
447 instance->buf_usage = buf_usage + avail_data;
448 return;
449 }
450 }
451
452 for (; avail_data >= stride; avail_data -= stride, source += stride)
453 usbatm_extract_one_cell(instance, source);
454
455 if (avail_data > 0) {
456 /* length was not a multiple of stride -
457 * save remaining data for next call */
458 memcpy(instance->cell_buf, source, avail_data);
459 instance->buf_usage = avail_data;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200460 }
461}
462
463
464/*************
465** encode **
466*************/
467
468static unsigned int usbatm_write_cells(struct usbatm_data *instance,
469 struct sk_buff *skb,
470 u8 *target, unsigned int avail_space)
471{
472 struct usbatm_control *ctrl = UDSL_SKB(skb);
473 struct atm_vcc *vcc = ctrl->atm.vcc;
Duncan Sands6f749472006-01-13 10:52:38 +0100474 unsigned int bytes_written;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200475 unsigned int stride = instance->tx_channel.stride;
476
477 vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
Greg Kroah-Hartman3b6004f2008-08-14 09:37:34 -0700478 UDSL_ASSERT(instance, !(avail_space % stride));
Duncan Sandsc59bba72005-05-11 20:24:03 +0200479
Duncan Sands6f749472006-01-13 10:52:38 +0100480 for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
481 bytes_written += stride, target += stride) {
Duncan Sandsc59bba72005-05-11 20:24:03 +0200482 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
483 unsigned int left = ATM_CELL_PAYLOAD - data_len;
484 u8 *ptr = target;
485
486 ptr[0] = vcc->vpi >> 4;
487 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
488 ptr[2] = vcc->vci >> 4;
489 ptr[3] = vcc->vci << 4;
490 ptr[4] = 0xec;
491 ptr += ATM_CELL_HEADER;
492
Arnaldo Carvalho de Melod626f622007-03-27 18:55:52 -0300493 skb_copy_from_linear_data(skb, ptr, data_len);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200494 ptr += data_len;
495 __skb_pull(skb, data_len);
496
497 if(!left)
498 continue;
499
500 memset(ptr, 0, left);
501
502 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
503 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
504 /* trailer[0] = 0; UU = 0 */
505 /* trailer[1] = 0; CPI = 0 */
506 trailer[2] = ctrl->len >> 8;
507 trailer[3] = ctrl->len;
508
509 ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
510
511 trailer[4] = ctrl->crc >> 24;
512 trailer[5] = ctrl->crc >> 16;
513 trailer[6] = ctrl->crc >> 8;
514 trailer[7] = ctrl->crc;
515
516 target[3] |= 0x2; /* adjust PTI */
517
518 ctrl->len = 0; /* tag this skb finished */
519 }
520 else
521 ctrl->crc = crc32_be(ctrl->crc, ptr, left);
522 }
523
Duncan Sands6f749472006-01-13 10:52:38 +0100524 return bytes_written;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200525}
526
527
528/**************
529** receive **
530**************/
531
532static void usbatm_rx_process(unsigned long data)
533{
534 struct usbatm_data *instance = (struct usbatm_data *)data;
535 struct urb *urb;
536
537 while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
538 vdbg("%s: processing urb 0x%p", __func__, urb);
539
540 if (usb_pipeisoc(urb->pipe)) {
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100541 unsigned char *merge_start = NULL;
542 unsigned int merge_length = 0;
543 const unsigned int packet_size = instance->rx_channel.packet_size;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200544 int i;
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100545
546 for (i = 0; i < urb->number_of_packets; i++) {
547 if (!urb->iso_frame_desc[i].status) {
548 unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
549
Greg Kroah-Hartman3b6004f2008-08-14 09:37:34 -0700550 UDSL_ASSERT(instance, actual_length <= packet_size);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100551
552 if (!merge_length)
553 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
554 merge_length += actual_length;
555 if (merge_length && (actual_length < packet_size)) {
556 usbatm_extract_cells(instance, merge_start, merge_length);
557 merge_length = 0;
558 }
559 } else {
560 atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
561 if (merge_length)
562 usbatm_extract_cells(instance, merge_start, merge_length);
563 merge_length = 0;
564 instance->buf_usage = 0;
565 }
566 }
567
568 if (merge_length)
569 usbatm_extract_cells(instance, merge_start, merge_length);
570 } else
Duncan Sandsc59bba72005-05-11 20:24:03 +0200571 if (!urb->status)
572 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100573 else
574 instance->buf_usage = 0;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200575
576 if (usbatm_submit_urb(urb))
577 return;
578 }
579}
580
581
582/***********
583** send **
584***********/
585
586static void usbatm_tx_process(unsigned long data)
587{
588 struct usbatm_data *instance = (struct usbatm_data *)data;
589 struct sk_buff *skb = instance->current_skb;
590 struct urb *urb = NULL;
591 const unsigned int buf_size = instance->tx_channel.buf_size;
Duncan Sands6f749472006-01-13 10:52:38 +0100592 unsigned int bytes_written = 0;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200593 u8 *buffer = NULL;
594
595 if (!skb)
596 skb = skb_dequeue(&instance->sndqueue);
597
598 while (skb) {
599 if (!urb) {
600 urb = usbatm_pop_urb(&instance->tx_channel);
601 if (!urb)
602 break; /* no more senders */
603 buffer = urb->transfer_buffer;
Duncan Sands6f749472006-01-13 10:52:38 +0100604 bytes_written = (urb->status == -EAGAIN) ?
Duncan Sandsc59bba72005-05-11 20:24:03 +0200605 urb->transfer_buffer_length : 0;
606 }
607
Duncan Sands6f749472006-01-13 10:52:38 +0100608 bytes_written += usbatm_write_cells(instance, skb,
609 buffer + bytes_written,
610 buf_size - bytes_written);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200611
612 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
Duncan Sands6f749472006-01-13 10:52:38 +0100613 __func__, bytes_written, skb, urb);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200614
615 if (!UDSL_SKB(skb)->len) {
616 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
617
618 usbatm_pop(vcc, skb);
619 atomic_inc(&vcc->stats->tx);
620
621 skb = skb_dequeue(&instance->sndqueue);
622 }
623
Duncan Sands6f749472006-01-13 10:52:38 +0100624 if (bytes_written == buf_size || (!skb && bytes_written)) {
625 urb->transfer_buffer_length = bytes_written;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200626
627 if (usbatm_submit_urb(urb))
628 break;
629 urb = NULL;
630 }
631 }
632
633 instance->current_skb = skb;
634}
635
636static void usbatm_cancel_send(struct usbatm_data *instance,
637 struct atm_vcc *vcc)
638{
639 struct sk_buff *skb, *n;
640
641 atm_dbg(instance, "%s entered\n", __func__);
642 spin_lock_irq(&instance->sndqueue.lock);
David S. Millerb5f61ab2008-09-23 00:27:47 -0700643 skb_queue_walk_safe(&instance->sndqueue, skb, n) {
Duncan Sandsc59bba72005-05-11 20:24:03 +0200644 if (UDSL_SKB(skb)->atm.vcc == vcc) {
645 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
646 __skb_unlink(skb, &instance->sndqueue);
647 usbatm_pop(vcc, skb);
648 }
David S. Millerb5f61ab2008-09-23 00:27:47 -0700649 }
Duncan Sandsc59bba72005-05-11 20:24:03 +0200650 spin_unlock_irq(&instance->sndqueue.lock);
651
652 tasklet_disable(&instance->tx_channel.tasklet);
653 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
654 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
655 instance->current_skb = NULL;
656 usbatm_pop(vcc, skb);
657 }
658 tasklet_enable(&instance->tx_channel.tasklet);
659 atm_dbg(instance, "%s done\n", __func__);
660}
661
662static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
663{
664 struct usbatm_data *instance = vcc->dev->dev_data;
665 struct usbatm_control *ctrl = UDSL_SKB(skb);
666 int err;
667
668 vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
669
Duncan Sands0e42a622006-01-13 10:05:15 +0100670 /* racy disconnection check - fine */
671 if (!instance || instance->disconnected) {
672#ifdef DEBUG
673 if (printk_ratelimit())
674 printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
675#endif
Duncan Sandsc59bba72005-05-11 20:24:03 +0200676 err = -ENODEV;
677 goto fail;
678 }
679
680 if (vcc->qos.aal != ATM_AAL5) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100681 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200682 err = -EINVAL;
683 goto fail;
684 }
685
686 if (skb->len > ATM_MAX_AAL5_PDU) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100687 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
Duncan Sandsc59bba72005-05-11 20:24:03 +0200688 __func__, skb->len, ATM_MAX_AAL5_PDU);
689 err = -EINVAL;
690 goto fail;
691 }
692
693 PACKETDEBUG(skb->data, skb->len);
694
695 /* initialize the control block */
696 ctrl->atm.vcc = vcc;
697 ctrl->len = skb->len;
698 ctrl->crc = crc32_be(~0, skb->data, skb->len);
699
700 skb_queue_tail(&instance->sndqueue, skb);
701 tasklet_schedule(&instance->tx_channel.tasklet);
702
703 return 0;
704
705 fail:
706 usbatm_pop(vcc, skb);
707 return err;
708}
709
710
711/********************
712** bean counting **
713********************/
714
715static void usbatm_destroy_instance(struct kref *kref)
716{
717 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
718
719 dbg("%s", __func__);
720
721 tasklet_kill(&instance->rx_channel.tasklet);
722 tasklet_kill(&instance->tx_channel.tasklet);
723 usb_put_dev(instance->usb_dev);
724 kfree(instance);
725}
726
Adrian Bunk3d485862005-11-20 23:56:11 +0100727static void usbatm_get_instance(struct usbatm_data *instance)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200728{
729 dbg("%s", __func__);
730
731 kref_get(&instance->refcount);
732}
733
Adrian Bunk3d485862005-11-20 23:56:11 +0100734static void usbatm_put_instance(struct usbatm_data *instance)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200735{
736 dbg("%s", __func__);
737
738 kref_put(&instance->refcount, usbatm_destroy_instance);
739}
740
741
742/**********
743** ATM **
744**********/
745
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100746static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
Duncan Sandsc59bba72005-05-11 20:24:03 +0200747{
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100748 struct usbatm_data *instance = atm_dev->dev_data;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200749
750 dbg("%s", __func__);
751
752 if (!instance)
753 return;
754
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100755 atm_dev->dev_data = NULL; /* catch bugs */
Duncan Sandsc59bba72005-05-11 20:24:03 +0200756 usbatm_put_instance(instance); /* taken in usbatm_atm_init */
757}
758
759static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
760{
761 struct usbatm_data *instance = atm_dev->dev_data;
762 int left = *pos;
763
764 if (!instance) {
765 dbg("%s: NULL instance!", __func__);
766 return -ENODEV;
767 }
768
769 if (!left--)
770 return sprintf(page, "%s\n", instance->description);
771
772 if (!left--)
Johannes Berg7c510e42008-10-27 17:47:26 -0700773 return sprintf(page, "MAC: %pM\n", atm_dev->esi);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200774
775 if (!left--)
776 return sprintf(page,
777 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
778 atomic_read(&atm_dev->stats.aal5.tx),
779 atomic_read(&atm_dev->stats.aal5.tx_err),
780 atomic_read(&atm_dev->stats.aal5.rx),
781 atomic_read(&atm_dev->stats.aal5.rx_err),
782 atomic_read(&atm_dev->stats.aal5.rx_drop));
783
Duncan Sands0e42a622006-01-13 10:05:15 +0100784 if (!left--) {
785 if (instance->disconnected)
786 return sprintf(page, "Disconnected\n");
787 else
788 switch (atm_dev->signal) {
789 case ATM_PHY_SIG_FOUND:
790 return sprintf(page, "Line up\n");
791 case ATM_PHY_SIG_LOST:
792 return sprintf(page, "Line down\n");
793 default:
794 return sprintf(page, "Line state unknown\n");
795 }
796 }
Duncan Sandsc59bba72005-05-11 20:24:03 +0200797
798 return 0;
799}
800
801static int usbatm_atm_open(struct atm_vcc *vcc)
802{
803 struct usbatm_data *instance = vcc->dev->dev_data;
804 struct usbatm_vcc_data *new = NULL;
805 int ret;
806 int vci = vcc->vci;
807 short vpi = vcc->vpi;
808
809 if (!instance) {
810 dbg("%s: NULL data!", __func__);
811 return -ENODEV;
812 }
813
814 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
815
816 /* only support AAL5 */
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100817 if ((vcc->qos.aal != ATM_AAL5)) {
818 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200819 return -EINVAL;
820 }
821
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100822 /* sanity checks */
823 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
824 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
825 return -EINVAL;
826 }
827
Arjan van de Venab3c81f2006-01-13 15:52:55 +0100828 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
Duncan Sandsc59bba72005-05-11 20:24:03 +0200829
Duncan Sands0e42a622006-01-13 10:05:15 +0100830 if (instance->disconnected) {
831 atm_dbg(instance, "%s: disconnected!\n", __func__);
832 ret = -ENODEV;
833 goto fail;
834 }
835
Duncan Sandsc59bba72005-05-11 20:24:03 +0200836 if (usbatm_find_vcc(instance, vpi, vci)) {
837 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
838 ret = -EADDRINUSE;
839 goto fail;
840 }
841
Duncan Sands9a734ef2006-01-13 09:38:22 +0100842 if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100843 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200844 ret = -ENOMEM;
845 goto fail;
846 }
847
Duncan Sandsc59bba72005-05-11 20:24:03 +0200848 new->vcc = vcc;
849 new->vpi = vpi;
850 new->vci = vci;
851
852 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
853 if (!new->sarb) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100854 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200855 ret = -ENOMEM;
856 goto fail;
857 }
858
859 vcc->dev_data = new;
860
861 tasklet_disable(&instance->rx_channel.tasklet);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100862 instance->cached_vcc = new;
863 instance->cached_vpi = vpi;
864 instance->cached_vci = vci;
Duncan Sandsc59bba72005-05-11 20:24:03 +0200865 list_add(&new->list, &instance->vcc_list);
866 tasklet_enable(&instance->rx_channel.tasklet);
867
868 set_bit(ATM_VF_ADDR, &vcc->flags);
869 set_bit(ATM_VF_PARTIAL, &vcc->flags);
870 set_bit(ATM_VF_READY, &vcc->flags);
871
Arjan van de Venab3c81f2006-01-13 15:52:55 +0100872 mutex_unlock(&instance->serialize);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200873
874 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
875
876 return 0;
877
878fail:
879 kfree(new);
Arjan van de Venab3c81f2006-01-13 15:52:55 +0100880 mutex_unlock(&instance->serialize);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200881 return ret;
882}
883
884static void usbatm_atm_close(struct atm_vcc *vcc)
885{
886 struct usbatm_data *instance = vcc->dev->dev_data;
887 struct usbatm_vcc_data *vcc_data = vcc->dev_data;
888
889 if (!instance || !vcc_data) {
890 dbg("%s: NULL data!", __func__);
891 return;
892 }
893
894 atm_dbg(instance, "%s entered\n", __func__);
895
896 atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
897 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
898
899 usbatm_cancel_send(instance, vcc);
900
Arjan van de Venab3c81f2006-01-13 15:52:55 +0100901 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
Duncan Sandsc59bba72005-05-11 20:24:03 +0200902
903 tasklet_disable(&instance->rx_channel.tasklet);
Duncan Sandse3fb2f62006-01-13 11:06:46 +0100904 if (instance->cached_vcc == vcc_data) {
905 instance->cached_vcc = NULL;
906 instance->cached_vpi = ATM_VPI_UNSPEC;
907 instance->cached_vci = ATM_VCI_UNSPEC;
908 }
Duncan Sandsc59bba72005-05-11 20:24:03 +0200909 list_del(&vcc_data->list);
910 tasklet_enable(&instance->rx_channel.tasklet);
911
912 kfree_skb(vcc_data->sarb);
913 vcc_data->sarb = NULL;
914
915 kfree(vcc_data);
916 vcc->dev_data = NULL;
917
918 vcc->vpi = ATM_VPI_UNSPEC;
919 vcc->vci = ATM_VCI_UNSPEC;
920 clear_bit(ATM_VF_READY, &vcc->flags);
921 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
922 clear_bit(ATM_VF_ADDR, &vcc->flags);
923
Arjan van de Venab3c81f2006-01-13 15:52:55 +0100924 mutex_unlock(&instance->serialize);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200925
926 atm_dbg(instance, "%s successful\n", __func__);
927}
928
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100929static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
Duncan Sandsc59bba72005-05-11 20:24:03 +0200930 void __user * arg)
931{
Duncan Sands0e42a622006-01-13 10:05:15 +0100932 struct usbatm_data *instance = atm_dev->dev_data;
933
934 if (!instance || instance->disconnected) {
935 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance");
936 return -ENODEV;
937 }
938
Duncan Sandsc59bba72005-05-11 20:24:03 +0200939 switch (cmd) {
940 case ATM_QUERYLOOP:
941 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
942 default:
943 return -ENOIOCTLCMD;
944 }
945}
946
947static int usbatm_atm_init(struct usbatm_data *instance)
948{
949 struct atm_dev *atm_dev;
950 int ret, i;
951
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100952 /* ATM init. The ATM initialization scheme suffers from an intrinsic race
953 * condition: callbacks we register can be executed at once, before we have
954 * initialized the struct atm_dev. To protect against this, all callbacks
955 * abort if atm_dev->dev_data is NULL. */
Duncan Sandsc59bba72005-05-11 20:24:03 +0200956 atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL);
957 if (!atm_dev) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100958 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200959 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
Simon Arlotte9b8daf2007-03-06 02:47:43 -0800971 ret = sysfs_create_link(&atm_dev->class_dev.kobj,
972 &instance->usb_intf->dev.kobj, "device");
973 if (ret) {
974 atm_err(instance, "%s: sysfs_create_link failed: %d\n",
975 __func__, ret);
976 goto fail_sysfs;
977 }
978
Duncan Sandsc59bba72005-05-11 20:24:03 +0200979 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100980 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
Duncan Sandsc59bba72005-05-11 20:24:03 +0200981 goto fail;
982 }
983
Duncan Sandsc59bba72005-05-11 20:24:03 +0200984 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
Duncan Sands0ec3c7e2006-01-17 11:15:13 +0100985
986 /* ready for ATM callbacks */
Duncan Sandsc59bba72005-05-11 20:24:03 +0200987 mb();
988 atm_dev->dev_data = instance;
989
990 /* submit all rx URBs */
991 for (i = 0; i < num_rcv_urbs; i++)
992 usbatm_submit_urb(instance->urbs[i]);
993
994 return 0;
995
996 fail:
Simon Arlotte9b8daf2007-03-06 02:47:43 -0800997 sysfs_remove_link(&atm_dev->class_dev.kobj, "device");
998 fail_sysfs:
Duncan Sandsc59bba72005-05-11 20:24:03 +0200999 instance->atm_dev = NULL;
Stanislaw Gruszka64bf69d2005-11-29 16:16:41 -08001000 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
Duncan Sandsc59bba72005-05-11 20:24:03 +02001001 return ret;
1002}
1003
1004
1005/**********
1006** USB **
1007**********/
1008
1009static int usbatm_do_heavy_init(void *arg)
1010{
1011 struct usbatm_data *instance = arg;
1012 int ret;
1013
Duncan Sandsc59bba72005-05-11 20:24:03 +02001014 allow_signal(SIGTERM);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001015 complete(&instance->thread_started);
1016
1017 ret = instance->driver->heavy_init(instance, instance->usb_intf);
1018
1019 if (!ret)
1020 ret = usbatm_atm_init(instance);
1021
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001022 mutex_lock(&instance->serialize);
Pavel Emelyanovc4504a72008-02-11 15:26:09 +03001023 instance->thread = NULL;
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001024 mutex_unlock(&instance->serialize);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001025
1026 complete_and_exit(&instance->thread_exited, ret);
1027}
1028
1029static int usbatm_heavy_init(struct usbatm_data *instance)
1030{
Pavel Emelyanovc4504a72008-02-11 15:26:09 +03001031 struct task_struct *t;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001032
Pavel Emelyanovc4504a72008-02-11 15:26:09 +03001033 t = kthread_create(usbatm_do_heavy_init, instance,
1034 instance->driver->driver_name);
1035 if (IS_ERR(t)) {
1036 usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n",
1037 __func__, PTR_ERR(t));
1038 return PTR_ERR(t);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001039 }
1040
Pavel Emelyanovc4504a72008-02-11 15:26:09 +03001041 instance->thread = t;
1042 wake_up_process(t);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001043 wait_for_completion(&instance->thread_started);
1044
1045 return 0;
1046}
1047
1048static void usbatm_tasklet_schedule(unsigned long data)
1049{
1050 tasklet_schedule((struct tasklet_struct *) data);
1051}
1052
Duncan Sandsfcf48302006-04-28 18:53:45 +02001053static void usbatm_init_channel(struct usbatm_channel *channel)
Duncan Sandsc59bba72005-05-11 20:24:03 +02001054{
1055 spin_lock_init(&channel->lock);
1056 INIT_LIST_HEAD(&channel->list);
1057 channel->delay.function = usbatm_tasklet_schedule;
1058 channel->delay.data = (unsigned long) &channel->tasklet;
1059 init_timer(&channel->delay);
1060}
1061
1062int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
1063 struct usbatm_driver *driver)
1064{
1065 struct device *dev = &intf->dev;
1066 struct usb_device *usb_dev = interface_to_usbdev(intf);
1067 struct usbatm_data *instance;
1068 char *buf;
1069 int error = -ENOMEM;
1070 int i, length;
Duncan Sands6f749472006-01-13 10:52:38 +01001071 unsigned int maxpacket, num_packets;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001072
Duncan Sands0ec3c7e2006-01-17 11:15:13 +01001073 dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",
Duncan Sandsc59bba72005-05-11 20:24:03 +02001074 __func__, driver->driver_name,
1075 le16_to_cpu(usb_dev->descriptor.idVendor),
1076 le16_to_cpu(usb_dev->descriptor.idProduct),
1077 intf->altsetting->desc.bInterfaceNumber);
1078
1079 /* instance init */
Pekka Enberg7b842b62005-09-06 15:18:34 -07001080 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001081 if (!instance) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +01001082 dev_err(dev, "%s: no memory for instance data!\n", __func__);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001083 return -ENOMEM;
1084 }
1085
Duncan Sandsc59bba72005-05-11 20:24:03 +02001086 /* public fields */
1087
1088 instance->driver = driver;
1089 snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
1090
1091 instance->usb_dev = usb_dev;
1092 instance->usb_intf = intf;
1093
1094 buf = instance->description;
1095 length = sizeof(instance->description);
1096
1097 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
1098 goto bind;
1099
1100 buf += i;
1101 length -= i;
1102
1103 i = scnprintf(buf, length, " (");
1104 buf += i;
1105 length -= i;
1106
1107 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1108 goto bind;
1109
1110 buf += i;
1111 length -= i;
1112
1113 snprintf(buf, length, ")");
1114
1115 bind:
Duncan Sands35644b02006-01-17 11:16:13 +01001116 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +01001117 dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001118 goto fail_free;
1119 }
1120
1121 /* private fields */
1122
1123 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001124 mutex_init(&instance->serialize);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001125
Pavel Emelyanovc4504a72008-02-11 15:26:09 +03001126 instance->thread = NULL;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001127 init_completion(&instance->thread_started);
1128 init_completion(&instance->thread_exited);
1129
1130 INIT_LIST_HEAD(&instance->vcc_list);
Duncan Sands80aae7a2006-01-13 10:59:23 +01001131 skb_queue_head_init(&instance->sndqueue);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001132
1133 usbatm_init_channel(&instance->rx_channel);
1134 usbatm_init_channel(&instance->tx_channel);
1135 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1136 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001137 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1138 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001139 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1140
Duncan Sands80aae7a2006-01-13 10:59:23 +01001141 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
1142 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
1143 else
1144 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
1145
1146 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
1147
Duncan Sands6f749472006-01-13 10:52:38 +01001148 /* tx buffer size must be a positive multiple of the stride */
1149 instance->tx_channel.buf_size = max (instance->tx_channel.stride,
1150 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
1151
1152 /* rx buffer size must be a positive multiple of the endpoint maxpacket */
1153 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0);
1154
1155 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
1156 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
1157 usb_pipeendpoint(instance->rx_channel.endpoint));
1158 error = -EINVAL;
1159 goto fail_unbind;
1160 }
1161
1162 num_packets = max (1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
1163
1164 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
1165 num_packets--;
1166
1167 instance->rx_channel.buf_size = num_packets * maxpacket;
Duncan Sands80aae7a2006-01-13 10:59:23 +01001168 instance->rx_channel.packet_size = maxpacket;
Duncan Sands6f749472006-01-13 10:52:38 +01001169
1170#ifdef DEBUG
1171 for (i = 0; i < 2; i++) {
1172 struct usbatm_channel *channel = i ?
1173 &instance->tx_channel : &instance->rx_channel;
1174
1175 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel);
1176 }
1177#endif
1178
Duncan Sands80aae7a2006-01-13 10:59:23 +01001179 /* initialize urbs */
Duncan Sandsc59bba72005-05-11 20:24:03 +02001180
1181 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
Duncan Sandsc59bba72005-05-11 20:24:03 +02001182 u8 *buffer;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001183 struct usbatm_channel *channel = i < num_rcv_urbs ?
1184 &instance->rx_channel : &instance->tx_channel;
Duncan Sands80aae7a2006-01-13 10:59:23 +01001185 struct urb *urb;
1186 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001187
Greg Kroah-Hartman3b6004f2008-08-14 09:37:34 -07001188 UDSL_ASSERT(instance, !usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint));
Duncan Sandsc59bba72005-05-11 20:24:03 +02001189
1190 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1191 if (!urb) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +01001192 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
Duncan Sands72ef8ab2006-01-13 10:07:08 +01001193 error = -ENOMEM;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001194 goto fail_unbind;
1195 }
1196
Duncan Sands65412e42005-05-27 10:00:08 +02001197 instance->urbs[i] = urb;
1198
Duncan Sands9a734ef2006-01-13 09:38:22 +01001199 /* zero the tx padding to avoid leaking information */
1200 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001201 if (!buffer) {
Duncan Sands0ec3c7e2006-01-17 11:15:13 +01001202 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
Duncan Sands72ef8ab2006-01-13 10:07:08 +01001203 error = -ENOMEM;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001204 goto fail_unbind;
1205 }
Duncan Sandsc59bba72005-05-11 20:24:03 +02001206
1207 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1208 buffer, channel->buf_size, usbatm_complete, channel);
1209 if (iso_packets) {
1210 int j;
1211 urb->interval = 1;
1212 urb->transfer_flags = URB_ISO_ASAP;
1213 urb->number_of_packets = iso_packets;
1214 for (j = 0; j < iso_packets; j++) {
Duncan Sands80aae7a2006-01-13 10:59:23 +01001215 urb->iso_frame_desc[j].offset = channel->packet_size * j;
1216 urb->iso_frame_desc[j].length = channel->packet_size;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001217 }
1218 }
1219
1220 /* put all tx URBs on the list of spares */
1221 if (i >= num_rcv_urbs)
1222 list_add_tail(&urb->urb_list, &channel->list);
1223
1224 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1225 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001226 }
1227
Duncan Sandse3fb2f62006-01-13 11:06:46 +01001228 instance->cached_vpi = ATM_VPI_UNSPEC;
1229 instance->cached_vci = ATM_VCI_UNSPEC;
1230 instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
1231
1232 if (!instance->cell_buf) {
1233 dev_err(dev, "%s: no memory for cell buffer!\n", __func__);
1234 error = -ENOMEM;
1235 goto fail_unbind;
1236 }
1237
Duncan Sands35644b02006-01-17 11:16:13 +01001238 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
Duncan Sandsc59bba72005-05-11 20:24:03 +02001239 error = usbatm_heavy_init(instance);
1240 } else {
1241 complete(&instance->thread_exited); /* pretend that heavy_init was run */
1242 error = usbatm_atm_init(instance);
1243 }
1244
1245 if (error < 0)
1246 goto fail_unbind;
1247
1248 usb_get_dev(usb_dev);
1249 usb_set_intfdata(intf, instance);
1250
1251 return 0;
1252
1253 fail_unbind:
1254 if (instance->driver->unbind)
1255 instance->driver->unbind(instance, intf);
1256 fail_free:
Duncan Sandse3fb2f62006-01-13 11:06:46 +01001257 kfree(instance->cell_buf);
1258
Duncan Sandsc59bba72005-05-11 20:24:03 +02001259 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1260 if (instance->urbs[i])
1261 kfree(instance->urbs[i]->transfer_buffer);
1262 usb_free_urb(instance->urbs[i]);
1263 }
1264
1265 kfree (instance);
1266
1267 return error;
1268}
1269EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1270
1271void usbatm_usb_disconnect(struct usb_interface *intf)
1272{
1273 struct device *dev = &intf->dev;
1274 struct usbatm_data *instance = usb_get_intfdata(intf);
Duncan Sands0e42a622006-01-13 10:05:15 +01001275 struct usbatm_vcc_data *vcc_data;
Duncan Sandsc59bba72005-05-11 20:24:03 +02001276 int i;
1277
1278 dev_dbg(dev, "%s entered\n", __func__);
1279
1280 if (!instance) {
1281 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1282 return;
1283 }
1284
1285 usb_set_intfdata(intf, NULL);
1286
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001287 mutex_lock(&instance->serialize);
Duncan Sands0e42a622006-01-13 10:05:15 +01001288 instance->disconnected = 1;
Pavel Emelyanovc4504a72008-02-11 15:26:09 +03001289 if (instance->thread != NULL)
1290 send_sig(SIGTERM, instance->thread, 1);
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001291 mutex_unlock(&instance->serialize);
Duncan Sandsc59bba72005-05-11 20:24:03 +02001292
1293 wait_for_completion(&instance->thread_exited);
1294
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001295 mutex_lock(&instance->serialize);
Duncan Sands0e42a622006-01-13 10:05:15 +01001296 list_for_each_entry(vcc_data, &instance->vcc_list, list)
1297 vcc_release_async(vcc_data->vcc, -EPIPE);
Arjan van de Venab3c81f2006-01-13 15:52:55 +01001298 mutex_unlock(&instance->serialize);
Duncan Sands0e42a622006-01-13 10:05:15 +01001299
Duncan Sandsc59bba72005-05-11 20:24:03 +02001300 tasklet_disable(&instance->rx_channel.tasklet);
1301 tasklet_disable(&instance->tx_channel.tasklet);
1302
1303 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1304 usb_kill_urb(instance->urbs[i]);
1305
1306 del_timer_sync(&instance->rx_channel.delay);
1307 del_timer_sync(&instance->tx_channel.delay);
1308
Duncan Sands0e42a622006-01-13 10:05:15 +01001309 /* turn usbatm_[rt]x_process into something close to a no-op */
1310 /* no need to take the spinlock */
1311 INIT_LIST_HEAD(&instance->rx_channel.list);
1312 INIT_LIST_HEAD(&instance->tx_channel.list);
1313
1314 tasklet_enable(&instance->rx_channel.tasklet);
1315 tasklet_enable(&instance->tx_channel.tasklet);
1316
Duncan Sandsc59bba72005-05-11 20:24:03 +02001317 if (instance->atm_dev && instance->driver->atm_stop)
1318 instance->driver->atm_stop(instance, instance->atm_dev);
1319
1320 if (instance->driver->unbind)
1321 instance->driver->unbind(instance, intf);
1322
1323 instance->driver_data = NULL;
1324
Duncan Sandsc59bba72005-05-11 20:24:03 +02001325 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1326 kfree(instance->urbs[i]->transfer_buffer);
1327 usb_free_urb(instance->urbs[i]);
1328 }
1329
Duncan Sandse3fb2f62006-01-13 11:06:46 +01001330 kfree(instance->cell_buf);
1331
Duncan Sandsc59bba72005-05-11 20:24:03 +02001332 /* ATM finalize */
Simon Arlotte9b8daf2007-03-06 02:47:43 -08001333 if (instance->atm_dev) {
1334 sysfs_remove_link(&instance->atm_dev->class_dev.kobj, "device");
Stanislaw Gruszka64bf69d2005-11-29 16:16:41 -08001335 atm_dev_deregister(instance->atm_dev);
Simon Arlott9fc950d2009-11-21 15:33:51 +00001336 instance->atm_dev = NULL;
Simon Arlotte9b8daf2007-03-06 02:47:43 -08001337 }
Duncan Sandsc59bba72005-05-11 20:24:03 +02001338
1339 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
1340}
1341EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1342
1343
1344/***********
1345** init **
1346***********/
1347
1348static int __init usbatm_usb_init(void)
1349{
1350 dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1351
Thiago Farina08add0c2010-01-11 20:45:26 -05001352 if (sizeof(struct usbatm_control) > FIELD_SIZEOF(struct sk_buff, cb)) {
Duncan Sandsc59bba72005-05-11 20:24:03 +02001353 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1354 return -EIO;
1355 }
1356
1357 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1358 || (num_snd_urbs > UDSL_MAX_SND_URBS)
Duncan Sands6f749472006-01-13 10:52:38 +01001359 || (rcv_buf_bytes < 1)
1360 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
1361 || (snd_buf_bytes < 1)
1362 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
Duncan Sandsc59bba72005-05-11 20:24:03 +02001363 return -EINVAL;
1364
1365 return 0;
1366}
1367module_init(usbatm_usb_init);
1368
1369static void __exit usbatm_usb_exit(void)
1370{
1371 dbg("%s", __func__);
1372}
1373module_exit(usbatm_usb_exit);
1374
1375MODULE_AUTHOR(DRIVER_AUTHOR);
1376MODULE_DESCRIPTION(DRIVER_DESC);
1377MODULE_LICENSE("GPL");
1378MODULE_VERSION(DRIVER_VERSION);
1379
1380/************
1381** debug **
1382************/
1383
1384#ifdef VERBOSE_DEBUG
1385static int usbatm_print_packet(const unsigned char *data, int len)
1386{
1387 unsigned char buffer[256];
1388 int i = 0, j = 0;
1389
1390 for (i = 0; i < len;) {
1391 buffer[0] = '\0';
1392 sprintf(buffer, "%.3d :", i);
1393 for (j = 0; (j < 16) && (i < len); j++, i++) {
1394 sprintf(buffer, "%s %2.2x", buffer, data[i]);
1395 }
1396 dbg("%s", buffer);
1397 }
1398 return i;
1399}
1400#endif