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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*********************************************************************
2 *
3 * Filename: qos.c
4 * Version: 1.0
5 * Description: IrLAP QoS parameter negotiation
6 * Status: Stable
7 * Author: Dag Brattli <dagb@cs.uit.no>
8 * Created at: Tue Sep 9 00:00:26 1997
9 * Modified at: Sun Jan 30 14:29:16 2000
10 * Modified by: Dag Brattli <dagb@cs.uit.no>
11 *
12 * Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>,
13 * All Rights Reserved.
14 * Copyright (c) 2000-2001 Jean Tourrilhes <jt@hpl.hp.com>
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation; either version 2 of
19 * the License, or (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 * MA 02111-1307 USA
30 *
31 ********************************************************************/
32
33#include <linux/config.h>
34#include <asm/byteorder.h>
35
36#include <net/irda/irda.h>
37#include <net/irda/parameters.h>
38#include <net/irda/qos.h>
39#include <net/irda/irlap.h>
40
41/*
42 * Maximum values of the baud rate we negociate with the other end.
43 * Most often, you don't have to change that, because Linux-IrDA will
44 * use the maximum offered by the link layer, which usually works fine.
45 * In some very rare cases, you may want to limit it to lower speeds...
46 */
47int sysctl_max_baud_rate = 16000000;
48/*
49 * Maximum value of the lap disconnect timer we negociate with the other end.
50 * Most often, the value below represent the best compromise, but some user
51 * may want to keep the LAP alive longuer or shorter in case of link failure.
52 * Remember that the threshold time (early warning) is fixed to 3s...
53 */
54int sysctl_max_noreply_time = 12;
55/*
56 * Minimum turn time to be applied before transmitting to the peer.
57 * Nonzero values (usec) are used as lower limit to the per-connection
58 * mtt value which was announced by the other end during negotiation.
59 * Might be helpful if the peer device provides too short mtt.
60 * Default is 10us which means using the unmodified value given by the
61 * peer except if it's 0 (0 is likely a bug in the other stack).
62 */
63unsigned sysctl_min_tx_turn_time = 10;
64/*
65 * Maximum data size to be used in transmission in payload of LAP frame.
66 * There is a bit of confusion in the IrDA spec :
67 * The LAP spec defines the payload of a LAP frame (I field) to be
68 * 2048 bytes max (IrLAP 1.1, chapt 6.6.5, p40).
69 * On the other hand, the PHY mention frames of 2048 bytes max (IrPHY
70 * 1.2, chapt 5.3.2.1, p41). But, this number includes the LAP header
71 * (2 bytes), and CRC (32 bits at 4 Mb/s). So, for the I field (LAP
72 * payload), that's only 2042 bytes. Oups !
73 * My nsc-ircc hardware has troubles receiving 2048 bytes frames at 4 Mb/s,
74 * so adjust to 2042... I don't know if this bug applies only for 2048
75 * bytes frames or all negotiated frame sizes, but you can use the sysctl
76 * to play with this value anyway.
77 * Jean II */
78unsigned sysctl_max_tx_data_size = 2042;
79/*
80 * Maximum transmit window, i.e. number of LAP frames between turn-around.
81 * This allow to override what the peer told us. Some peers are buggy and
82 * don't always support what they tell us.
83 * Jean II */
84unsigned sysctl_max_tx_window = 7;
85
86static int irlap_param_baud_rate(void *instance, irda_param_t *param, int get);
87static int irlap_param_link_disconnect(void *instance, irda_param_t *parm,
88 int get);
89static int irlap_param_max_turn_time(void *instance, irda_param_t *param,
90 int get);
91static int irlap_param_data_size(void *instance, irda_param_t *param, int get);
92static int irlap_param_window_size(void *instance, irda_param_t *param,
93 int get);
94static int irlap_param_additional_bofs(void *instance, irda_param_t *parm,
95 int get);
96static int irlap_param_min_turn_time(void *instance, irda_param_t *param,
97 int get);
98
99#ifndef CONFIG_IRDA_DYNAMIC_WINDOW
100static __u32 irlap_requested_line_capacity(struct qos_info *qos);
101#endif
102
103static __u32 min_turn_times[] = { 10000, 5000, 1000, 500, 100, 50, 10, 0 }; /* us */
104static __u32 baud_rates[] = { 2400, 9600, 19200, 38400, 57600, 115200, 576000,
105 1152000, 4000000, 16000000 }; /* bps */
106static __u32 data_sizes[] = { 64, 128, 256, 512, 1024, 2048 }; /* bytes */
107static __u32 add_bofs[] = { 48, 24, 12, 5, 3, 2, 1, 0 }; /* bytes */
108static __u32 max_turn_times[] = { 500, 250, 100, 50 }; /* ms */
109static __u32 link_disc_times[] = { 3, 8, 12, 16, 20, 25, 30, 40 }; /* secs */
110
111static __u32 max_line_capacities[10][4] = {
112 /* 500 ms 250 ms 100 ms 50 ms (max turn time) */
113 { 100, 0, 0, 0 }, /* 2400 bps */
114 { 400, 0, 0, 0 }, /* 9600 bps */
115 { 800, 0, 0, 0 }, /* 19200 bps */
116 { 1600, 0, 0, 0 }, /* 38400 bps */
117 { 2360, 0, 0, 0 }, /* 57600 bps */
118 { 4800, 2400, 960, 480 }, /* 115200 bps */
119 { 28800, 11520, 5760, 2880 }, /* 576000 bps */
120 { 57600, 28800, 11520, 5760 }, /* 1152000 bps */
121 { 200000, 100000, 40000, 20000 }, /* 4000000 bps */
122 { 800000, 400000, 160000, 80000 }, /* 16000000 bps */
123};
124
125static pi_minor_info_t pi_minor_call_table_type_0[] = {
126 { NULL, 0 },
127/* 01 */{ irlap_param_baud_rate, PV_INTEGER | PV_LITTLE_ENDIAN },
128 { NULL, 0 },
129 { NULL, 0 },
130 { NULL, 0 },
131 { NULL, 0 },
132 { NULL, 0 },
133 { NULL, 0 },
134/* 08 */{ irlap_param_link_disconnect, PV_INT_8_BITS }
135};
136
137static pi_minor_info_t pi_minor_call_table_type_1[] = {
138 { NULL, 0 },
139 { NULL, 0 },
140/* 82 */{ irlap_param_max_turn_time, PV_INT_8_BITS },
141/* 83 */{ irlap_param_data_size, PV_INT_8_BITS },
142/* 84 */{ irlap_param_window_size, PV_INT_8_BITS },
143/* 85 */{ irlap_param_additional_bofs, PV_INT_8_BITS },
144/* 86 */{ irlap_param_min_turn_time, PV_INT_8_BITS },
145};
146
147static pi_major_info_t pi_major_call_table[] = {
148 { pi_minor_call_table_type_0, 9 },
149 { pi_minor_call_table_type_1, 7 },
150};
151
152static pi_param_info_t irlap_param_info = { pi_major_call_table, 2, 0x7f, 7 };
153
154/* ---------------------- LOCAL SUBROUTINES ---------------------- */
155/* Note : we start with a bunch of local subroutines.
156 * As the compiler is "one pass", this is the only way to get them to
157 * inline properly...
158 * Jean II
159 */
160/*
161 * Function value_index (value, array, size)
162 *
163 * Returns the index to the value in the specified array
164 */
165static inline int value_index(__u32 value, __u32 *array, int size)
166{
167 int i;
168
169 for (i=0; i < size; i++)
170 if (array[i] == value)
171 break;
172 return i;
173}
174
175/*
176 * Function index_value (index, array)
177 *
178 * Returns value to index in array, easy!
179 *
180 */
181static inline __u32 index_value(int index, __u32 *array)
182{
183 return array[index];
184}
185
186/*
187 * Function msb_index (word)
188 *
189 * Returns index to most significant bit (MSB) in word
190 *
191 */
192static int msb_index (__u16 word)
193{
194 __u16 msb = 0x8000;
195 int index = 15; /* Current MSB */
196
197 /* Check for buggy peers.
198 * Note : there is a small probability that it could be us, but I
199 * would expect driver authors to catch that pretty early and be
200 * able to check precisely what's going on. If a end user sees this,
201 * it's very likely the peer. - Jean II */
202 if (word == 0) {
203 IRDA_WARNING("%s(), Detected buggy peer, adjust null PV to 0x1!\n",
204 __FUNCTION__);
205 /* The only safe choice (we don't know the array size) */
206 word = 0x1;
207 }
208
209 while (msb) {
210 if (word & msb)
211 break; /* Found it! */
212 msb >>=1;
213 index--;
214 }
215 return index;
216}
217
218/*
219 * Function value_lower_bits (value, array)
220 *
221 * Returns a bit field marking all possibility lower than value.
222 */
223static inline int value_lower_bits(__u32 value, __u32 *array, int size, __u16 *field)
224{
225 int i;
226 __u16 mask = 0x1;
227 __u16 result = 0x0;
228
229 for (i=0; i < size; i++) {
230 /* Add the current value to the bit field, shift mask */
231 result |= mask;
232 mask <<= 1;
233 /* Finished ? */
234 if (array[i] >= value)
235 break;
236 }
237 /* Send back a valid index */
238 if(i >= size)
239 i = size - 1; /* Last item */
240 *field = result;
241 return i;
242}
243
244/*
245 * Function value_highest_bit (value, array)
246 *
247 * Returns a bit field marking the highest possibility lower than value.
248 */
249static inline int value_highest_bit(__u32 value, __u32 *array, int size, __u16 *field)
250{
251 int i;
252 __u16 mask = 0x1;
253 __u16 result = 0x0;
254
255 for (i=0; i < size; i++) {
256 /* Finished ? */
257 if (array[i] <= value)
258 break;
259 /* Shift mask */
260 mask <<= 1;
261 }
262 /* Set the current value to the bit field */
263 result |= mask;
264 /* Send back a valid index */
265 if(i >= size)
266 i = size - 1; /* Last item */
267 *field = result;
268 return i;
269}
270
271/* -------------------------- MAIN CALLS -------------------------- */
272
273/*
274 * Function irda_qos_compute_intersection (qos, new)
275 *
276 * Compute the intersection of the old QoS capabilities with new ones
277 *
278 */
279void irda_qos_compute_intersection(struct qos_info *qos, struct qos_info *new)
280{
281 IRDA_ASSERT(qos != NULL, return;);
282 IRDA_ASSERT(new != NULL, return;);
283
284 /* Apply */
285 qos->baud_rate.bits &= new->baud_rate.bits;
286 qos->window_size.bits &= new->window_size.bits;
287 qos->min_turn_time.bits &= new->min_turn_time.bits;
288 qos->max_turn_time.bits &= new->max_turn_time.bits;
289 qos->data_size.bits &= new->data_size.bits;
290 qos->link_disc_time.bits &= new->link_disc_time.bits;
291 qos->additional_bofs.bits &= new->additional_bofs.bits;
292
293 irda_qos_bits_to_value(qos);
294}
295
296/*
297 * Function irda_init_max_qos_capabilies (qos)
298 *
299 * The purpose of this function is for layers and drivers to be able to
300 * set the maximum QoS possible and then "and in" their own limitations
301 *
302 */
303void irda_init_max_qos_capabilies(struct qos_info *qos)
304{
305 int i;
306 /*
307 * These are the maximum supported values as specified on pages
308 * 39-43 in IrLAP
309 */
310
311 /* Use sysctl to set some configurable values... */
312 /* Set configured max speed */
313 i = value_lower_bits(sysctl_max_baud_rate, baud_rates, 10,
314 &qos->baud_rate.bits);
315 sysctl_max_baud_rate = index_value(i, baud_rates);
316
317 /* Set configured max disc time */
318 i = value_lower_bits(sysctl_max_noreply_time, link_disc_times, 8,
319 &qos->link_disc_time.bits);
320 sysctl_max_noreply_time = index_value(i, link_disc_times);
321
322 /* LSB is first byte, MSB is second byte */
323 qos->baud_rate.bits &= 0x03ff;
324
325 qos->window_size.bits = 0x7f;
326 qos->min_turn_time.bits = 0xff;
327 qos->max_turn_time.bits = 0x0f;
328 qos->data_size.bits = 0x3f;
329 qos->link_disc_time.bits &= 0xff;
330 qos->additional_bofs.bits = 0xff;
331}
332EXPORT_SYMBOL(irda_init_max_qos_capabilies);
333
334/*
335 * Function irlap_adjust_qos_settings (qos)
336 *
337 * Adjust QoS settings in case some values are not possible to use because
338 * of other settings
339 */
340static void irlap_adjust_qos_settings(struct qos_info *qos)
341{
342 __u32 line_capacity;
343 int index;
344
345 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
346
347 /*
348 * Make sure the mintt is sensible.
349 * Main culprit : Ericsson T39. - Jean II
350 */
351 if (sysctl_min_tx_turn_time > qos->min_turn_time.value) {
352 int i;
353
354 IRDA_WARNING("%s(), Detected buggy peer, adjust mtt to %dus!\n",
355 __FUNCTION__, sysctl_min_tx_turn_time);
356
357 /* We don't really need bits, but easier this way */
358 i = value_highest_bit(sysctl_min_tx_turn_time, min_turn_times,
359 8, &qos->min_turn_time.bits);
360 sysctl_min_tx_turn_time = index_value(i, min_turn_times);
361 qos->min_turn_time.value = sysctl_min_tx_turn_time;
362 }
363
364 /*
365 * Not allowed to use a max turn time less than 500 ms if the baudrate
366 * is less than 115200
367 */
368 if ((qos->baud_rate.value < 115200) &&
369 (qos->max_turn_time.value < 500))
370 {
371 IRDA_DEBUG(0,
372 "%s(), adjusting max turn time from %d to 500 ms\n",
373 __FUNCTION__, qos->max_turn_time.value);
374 qos->max_turn_time.value = 500;
375 }
376
377 /*
378 * The data size must be adjusted according to the baud rate and max
379 * turn time
380 */
381 index = value_index(qos->data_size.value, data_sizes, 6);
382 line_capacity = irlap_max_line_capacity(qos->baud_rate.value,
383 qos->max_turn_time.value);
384
385#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
386 while ((qos->data_size.value > line_capacity) && (index > 0)) {
387 qos->data_size.value = data_sizes[index--];
388 IRDA_DEBUG(2, "%s(), reducing data size to %d\n",
389 __FUNCTION__, qos->data_size.value);
390 }
391#else /* Use method described in section 6.6.11 of IrLAP */
392 while (irlap_requested_line_capacity(qos) > line_capacity) {
393 IRDA_ASSERT(index != 0, return;);
394
395 /* Must be able to send at least one frame */
396 if (qos->window_size.value > 1) {
397 qos->window_size.value--;
398 IRDA_DEBUG(2, "%s(), reducing window size to %d\n",
399 __FUNCTION__, qos->window_size.value);
400 } else if (index > 1) {
401 qos->data_size.value = data_sizes[index--];
402 IRDA_DEBUG(2, "%s(), reducing data size to %d\n",
403 __FUNCTION__, qos->data_size.value);
404 } else {
405 IRDA_WARNING("%s(), nothing more we can do!\n",
406 __FUNCTION__);
407 }
408 }
409#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
410 /*
411 * Fix tx data size according to user limits - Jean II
412 */
413 if (qos->data_size.value > sysctl_max_tx_data_size)
414 /* Allow non discrete adjustement to avoid loosing capacity */
415 qos->data_size.value = sysctl_max_tx_data_size;
416 /*
417 * Override Tx window if user request it. - Jean II
418 */
419 if (qos->window_size.value > sysctl_max_tx_window)
420 qos->window_size.value = sysctl_max_tx_window;
421}
422
423/*
424 * Function irlap_negotiate (qos_device, qos_session, skb)
425 *
426 * Negotiate QoS values, not really that much negotiation :-)
427 * We just set the QoS capabilities for the peer station
428 *
429 */
430int irlap_qos_negotiate(struct irlap_cb *self, struct sk_buff *skb)
431{
432 int ret;
433
434 ret = irda_param_extract_all(self, skb->data, skb->len,
435 &irlap_param_info);
436
437 /* Convert the negotiated bits to values */
438 irda_qos_bits_to_value(&self->qos_tx);
439 irda_qos_bits_to_value(&self->qos_rx);
440
441 irlap_adjust_qos_settings(&self->qos_tx);
442
443 IRDA_DEBUG(2, "Setting BAUD_RATE to %d bps.\n",
444 self->qos_tx.baud_rate.value);
445 IRDA_DEBUG(2, "Setting DATA_SIZE to %d bytes\n",
446 self->qos_tx.data_size.value);
447 IRDA_DEBUG(2, "Setting WINDOW_SIZE to %d\n",
448 self->qos_tx.window_size.value);
449 IRDA_DEBUG(2, "Setting XBOFS to %d\n",
450 self->qos_tx.additional_bofs.value);
451 IRDA_DEBUG(2, "Setting MAX_TURN_TIME to %d ms.\n",
452 self->qos_tx.max_turn_time.value);
453 IRDA_DEBUG(2, "Setting MIN_TURN_TIME to %d usecs.\n",
454 self->qos_tx.min_turn_time.value);
455 IRDA_DEBUG(2, "Setting LINK_DISC to %d secs.\n",
456 self->qos_tx.link_disc_time.value);
457 return ret;
458}
459
460/*
461 * Function irlap_insert_negotiation_params (qos, fp)
462 *
463 * Insert QoS negotiaion pararameters into frame
464 *
465 */
466int irlap_insert_qos_negotiation_params(struct irlap_cb *self,
467 struct sk_buff *skb)
468{
469 int ret;
470
471 /* Insert data rate */
472 ret = irda_param_insert(self, PI_BAUD_RATE, skb->tail,
473 skb_tailroom(skb), &irlap_param_info);
474 if (ret < 0)
475 return ret;
476 skb_put(skb, ret);
477
478 /* Insert max turnaround time */
479 ret = irda_param_insert(self, PI_MAX_TURN_TIME, skb->tail,
480 skb_tailroom(skb), &irlap_param_info);
481 if (ret < 0)
482 return ret;
483 skb_put(skb, ret);
484
485 /* Insert data size */
486 ret = irda_param_insert(self, PI_DATA_SIZE, skb->tail,
487 skb_tailroom(skb), &irlap_param_info);
488 if (ret < 0)
489 return ret;
490 skb_put(skb, ret);
491
492 /* Insert window size */
493 ret = irda_param_insert(self, PI_WINDOW_SIZE, skb->tail,
494 skb_tailroom(skb), &irlap_param_info);
495 if (ret < 0)
496 return ret;
497 skb_put(skb, ret);
498
499 /* Insert additional BOFs */
500 ret = irda_param_insert(self, PI_ADD_BOFS, skb->tail,
501 skb_tailroom(skb), &irlap_param_info);
502 if (ret < 0)
503 return ret;
504 skb_put(skb, ret);
505
506 /* Insert minimum turnaround time */
507 ret = irda_param_insert(self, PI_MIN_TURN_TIME, skb->tail,
508 skb_tailroom(skb), &irlap_param_info);
509 if (ret < 0)
510 return ret;
511 skb_put(skb, ret);
512
513 /* Insert link disconnect/threshold time */
514 ret = irda_param_insert(self, PI_LINK_DISC, skb->tail,
515 skb_tailroom(skb), &irlap_param_info);
516 if (ret < 0)
517 return ret;
518 skb_put(skb, ret);
519
520 return 0;
521}
522
523/*
524 * Function irlap_param_baud_rate (instance, param, get)
525 *
526 * Negotiate data-rate
527 *
528 */
529static int irlap_param_baud_rate(void *instance, irda_param_t *param, int get)
530{
531 __u16 final;
532
533 struct irlap_cb *self = (struct irlap_cb *) instance;
534
535 IRDA_ASSERT(self != NULL, return -1;);
536 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
537
538 if (get) {
539 param->pv.i = self->qos_rx.baud_rate.bits;
540 IRDA_DEBUG(2, "%s(), baud rate = 0x%02x\n",
541 __FUNCTION__, param->pv.i);
542 } else {
543 /*
544 * Stations must agree on baud rate, so calculate
545 * intersection
546 */
547 IRDA_DEBUG(2, "Requested BAUD_RATE: 0x%04x\n", (__u16) param->pv.i);
548 final = (__u16) param->pv.i & self->qos_rx.baud_rate.bits;
549
550 IRDA_DEBUG(2, "Final BAUD_RATE: 0x%04x\n", final);
551 self->qos_tx.baud_rate.bits = final;
552 self->qos_rx.baud_rate.bits = final;
553 }
554
555 return 0;
556}
557
558/*
559 * Function irlap_param_link_disconnect (instance, param, get)
560 *
561 * Negotiate link disconnect/threshold time.
562 *
563 */
564static int irlap_param_link_disconnect(void *instance, irda_param_t *param,
565 int get)
566{
567 __u16 final;
568
569 struct irlap_cb *self = (struct irlap_cb *) instance;
570
571 IRDA_ASSERT(self != NULL, return -1;);
572 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
573
574 if (get)
575 param->pv.i = self->qos_rx.link_disc_time.bits;
576 else {
577 /*
578 * Stations must agree on link disconnect/threshold
579 * time.
580 */
581 IRDA_DEBUG(2, "LINK_DISC: %02x\n", (__u8) param->pv.i);
582 final = (__u8) param->pv.i & self->qos_rx.link_disc_time.bits;
583
584 IRDA_DEBUG(2, "Final LINK_DISC: %02x\n", final);
585 self->qos_tx.link_disc_time.bits = final;
586 self->qos_rx.link_disc_time.bits = final;
587 }
588 return 0;
589}
590
591/*
592 * Function irlap_param_max_turn_time (instance, param, get)
593 *
594 * Negotiate the maximum turnaround time. This is a type 1 parameter and
595 * will be negotiated independently for each station
596 *
597 */
598static int irlap_param_max_turn_time(void *instance, irda_param_t *param,
599 int get)
600{
601 struct irlap_cb *self = (struct irlap_cb *) instance;
602
603 IRDA_ASSERT(self != NULL, return -1;);
604 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
605
606 if (get)
607 param->pv.i = self->qos_rx.max_turn_time.bits;
608 else
609 self->qos_tx.max_turn_time.bits = (__u8) param->pv.i;
610
611 return 0;
612}
613
614/*
615 * Function irlap_param_data_size (instance, param, get)
616 *
617 * Negotiate the data size. This is a type 1 parameter and
618 * will be negotiated independently for each station
619 *
620 */
621static int irlap_param_data_size(void *instance, irda_param_t *param, int get)
622{
623 struct irlap_cb *self = (struct irlap_cb *) instance;
624
625 IRDA_ASSERT(self != NULL, return -1;);
626 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
627
628 if (get)
629 param->pv.i = self->qos_rx.data_size.bits;
630 else
631 self->qos_tx.data_size.bits = (__u8) param->pv.i;
632
633 return 0;
634}
635
636/*
637 * Function irlap_param_window_size (instance, param, get)
638 *
639 * Negotiate the window size. This is a type 1 parameter and
640 * will be negotiated independently for each station
641 *
642 */
643static int irlap_param_window_size(void *instance, irda_param_t *param,
644 int get)
645{
646 struct irlap_cb *self = (struct irlap_cb *) instance;
647
648 IRDA_ASSERT(self != NULL, return -1;);
649 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
650
651 if (get)
652 param->pv.i = self->qos_rx.window_size.bits;
653 else
654 self->qos_tx.window_size.bits = (__u8) param->pv.i;
655
656 return 0;
657}
658
659/*
660 * Function irlap_param_additional_bofs (instance, param, get)
661 *
662 * Negotiate additional BOF characters. This is a type 1 parameter and
663 * will be negotiated independently for each station.
664 */
665static int irlap_param_additional_bofs(void *instance, irda_param_t *param, int get)
666{
667 struct irlap_cb *self = (struct irlap_cb *) instance;
668
669 IRDA_ASSERT(self != NULL, return -1;);
670 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
671
672 if (get)
673 param->pv.i = self->qos_rx.additional_bofs.bits;
674 else
675 self->qos_tx.additional_bofs.bits = (__u8) param->pv.i;
676
677 return 0;
678}
679
680/*
681 * Function irlap_param_min_turn_time (instance, param, get)
682 *
683 * Negotiate the minimum turn around time. This is a type 1 parameter and
684 * will be negotiated independently for each station
685 */
686static int irlap_param_min_turn_time(void *instance, irda_param_t *param,
687 int get)
688{
689 struct irlap_cb *self = (struct irlap_cb *) instance;
690
691 IRDA_ASSERT(self != NULL, return -1;);
692 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
693
694 if (get)
695 param->pv.i = self->qos_rx.min_turn_time.bits;
696 else
697 self->qos_tx.min_turn_time.bits = (__u8) param->pv.i;
698
699 return 0;
700}
701
702/*
703 * Function irlap_max_line_capacity (speed, max_turn_time, min_turn_time)
704 *
705 * Calculate the maximum line capacity
706 *
707 */
708__u32 irlap_max_line_capacity(__u32 speed, __u32 max_turn_time)
709{
710 __u32 line_capacity;
711 int i,j;
712
713 IRDA_DEBUG(2, "%s(), speed=%d, max_turn_time=%d\n",
714 __FUNCTION__, speed, max_turn_time);
715
716 i = value_index(speed, baud_rates, 10);
717 j = value_index(max_turn_time, max_turn_times, 4);
718
719 IRDA_ASSERT(((i >=0) && (i <10)), return 0;);
720 IRDA_ASSERT(((j >=0) && (j <4)), return 0;);
721
722 line_capacity = max_line_capacities[i][j];
723
724 IRDA_DEBUG(2, "%s(), line capacity=%d bytes\n",
725 __FUNCTION__, line_capacity);
726
727 return line_capacity;
728}
729
730#ifndef CONFIG_IRDA_DYNAMIC_WINDOW
731static __u32 irlap_requested_line_capacity(struct qos_info *qos)
732{
733 __u32 line_capacity;
734
735 line_capacity = qos->window_size.value *
736 (qos->data_size.value + 6 + qos->additional_bofs.value) +
737 irlap_min_turn_time_in_bytes(qos->baud_rate.value,
738 qos->min_turn_time.value);
739
740 IRDA_DEBUG(2, "%s(), requested line capacity=%d\n",
741 __FUNCTION__, line_capacity);
742
743 return line_capacity;
744}
745#endif
746
747void irda_qos_bits_to_value(struct qos_info *qos)
748{
749 int index;
750
751 IRDA_ASSERT(qos != NULL, return;);
752
753 index = msb_index(qos->baud_rate.bits);
754 qos->baud_rate.value = baud_rates[index];
755
756 index = msb_index(qos->data_size.bits);
757 qos->data_size.value = data_sizes[index];
758
759 index = msb_index(qos->window_size.bits);
760 qos->window_size.value = index+1;
761
762 index = msb_index(qos->min_turn_time.bits);
763 qos->min_turn_time.value = min_turn_times[index];
764
765 index = msb_index(qos->max_turn_time.bits);
766 qos->max_turn_time.value = max_turn_times[index];
767
768 index = msb_index(qos->link_disc_time.bits);
769 qos->link_disc_time.value = link_disc_times[index];
770
771 index = msb_index(qos->additional_bofs.bits);
772 qos->additional_bofs.value = add_bofs[index];
773}
774EXPORT_SYMBOL(irda_qos_bits_to_value);