1 /*********************************************************************
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, see <http://www.gnu.org/licenses/>.
28 *
29 ********************************************************************/
30
31 #include <linux/export.h>
32
33 #include <asm/byteorder.h>
34
35 #include <net/irda/irda.h>
36 #include <net/irda/parameters.h>
37 #include <net/irda/qos.h>
38 #include <net/irda/irlap.h>
39 #include <net/irda/irlap_frame.h>
40
41 /*
42 * Maximum values of the baud rate we negotiate 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 */
47 int sysctl_max_baud_rate = 16000000;
48 /*
49 * Maximum value of the lap disconnect timer we negotiate 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 longer or shorter in case of link failure.
52 * Remember that the threshold time (early warning) is fixed to 3s...
53 */
54 int 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 */
63 unsigned int 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 */
78 unsigned int 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 */
84 unsigned int sysctl_max_tx_window = 7;
85
86 static int irlap_param_baud_rate(void *instance, irda_param_t *param, int get);
87 static int irlap_param_link_disconnect(void *instance, irda_param_t *parm,
88 int get);
89 static int irlap_param_max_turn_time(void *instance, irda_param_t *param,
90 int get);
91 static int irlap_param_data_size(void *instance, irda_param_t *param, int get);
92 static int irlap_param_window_size(void *instance, irda_param_t *param,
93 int get);
94 static int irlap_param_additional_bofs(void *instance, irda_param_t *parm,
95 int get);
96 static int irlap_param_min_turn_time(void *instance, irda_param_t *param,
97 int get);
98
99 #ifndef CONFIG_IRDA_DYNAMIC_WINDOW
100 static __u32 irlap_requested_line_capacity(struct qos_info *qos);
101 #endif
102
103 static __u32 min_turn_times[] = { 10000, 5000, 1000, 500, 100, 50, 10, 0 }; /* us */
104 static __u32 baud_rates[] = { 2400, 9600, 19200, 38400, 57600, 115200, 576000,
105 1152000, 4000000, 16000000 }; /* bps */
106 static __u32 data_sizes[] = { 64, 128, 256, 512, 1024, 2048 }; /* bytes */
107 static __u32 add_bofs[] = { 48, 24, 12, 5, 3, 2, 1, 0 }; /* bytes */
108 static __u32 max_turn_times[] = { 500, 250, 100, 50 }; /* ms */
109 static __u32 link_disc_times[] = { 3, 8, 12, 16, 20, 25, 30, 40 }; /* secs */
110
111 static __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
125 static const 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
137 static const 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
147 static const 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
152 static 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 */
value_index(__u32 value,__u32 * array,int size)165 static 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 */
index_value(int index,__u32 * array)181 static 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 */
msb_index(__u16 word)192 static 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 net_warn_ratelimited("%s(), Detected buggy peer, adjust null PV to 0x1!\n",
204 __func__);
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 */
value_lower_bits(__u32 value,__u32 * array,int size,__u16 * field)223 static 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 */
value_highest_bit(__u32 value,__u32 * array,int size,__u16 * field)249 static 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 */
irda_qos_compute_intersection(struct qos_info * qos,struct qos_info * new)279 void 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 */
irda_init_max_qos_capabilies(struct qos_info * qos)303 void 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 }
332 EXPORT_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 */
irlap_adjust_qos_settings(struct qos_info * qos)340 static void irlap_adjust_qos_settings(struct qos_info *qos)
341 {
342 __u32 line_capacity;
343 int index;
344
345 /*
346 * Make sure the mintt is sensible.
347 * Main culprit : Ericsson T39. - Jean II
348 */
349 if (sysctl_min_tx_turn_time > qos->min_turn_time.value) {
350 int i;
351
352 net_warn_ratelimited("%s(), Detected buggy peer, adjust mtt to %dus!\n",
353 __func__, sysctl_min_tx_turn_time);
354
355 /* We don't really need bits, but easier this way */
356 i = value_highest_bit(sysctl_min_tx_turn_time, min_turn_times,
357 8, &qos->min_turn_time.bits);
358 sysctl_min_tx_turn_time = index_value(i, min_turn_times);
359 qos->min_turn_time.value = sysctl_min_tx_turn_time;
360 }
361
362 /*
363 * Not allowed to use a max turn time less than 500 ms if the baudrate
364 * is less than 115200
365 */
366 if ((qos->baud_rate.value < 115200) &&
367 (qos->max_turn_time.value < 500))
368 {
369 pr_debug("%s(), adjusting max turn time from %d to 500 ms\n",
370 __func__, qos->max_turn_time.value);
371 qos->max_turn_time.value = 500;
372 }
373
374 /*
375 * The data size must be adjusted according to the baud rate and max
376 * turn time
377 */
378 index = value_index(qos->data_size.value, data_sizes, 6);
379 line_capacity = irlap_max_line_capacity(qos->baud_rate.value,
380 qos->max_turn_time.value);
381
382 #ifdef CONFIG_IRDA_DYNAMIC_WINDOW
383 while ((qos->data_size.value > line_capacity) && (index > 0)) {
384 qos->data_size.value = data_sizes[index--];
385 pr_debug("%s(), reducing data size to %d\n",
386 __func__, qos->data_size.value);
387 }
388 #else /* Use method described in section 6.6.11 of IrLAP */
389 while (irlap_requested_line_capacity(qos) > line_capacity) {
390 IRDA_ASSERT(index != 0, return;);
391
392 /* Must be able to send at least one frame */
393 if (qos->window_size.value > 1) {
394 qos->window_size.value--;
395 pr_debug("%s(), reducing window size to %d\n",
396 __func__, qos->window_size.value);
397 } else if (index > 1) {
398 qos->data_size.value = data_sizes[index--];
399 pr_debug("%s(), reducing data size to %d\n",
400 __func__, qos->data_size.value);
401 } else {
402 net_warn_ratelimited("%s(), nothing more we can do!\n",
403 __func__);
404 }
405 }
406 #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
407 /*
408 * Fix tx data size according to user limits - Jean II
409 */
410 if (qos->data_size.value > sysctl_max_tx_data_size)
411 /* Allow non discrete adjustement to avoid losing capacity */
412 qos->data_size.value = sysctl_max_tx_data_size;
413 /*
414 * Override Tx window if user request it. - Jean II
415 */
416 if (qos->window_size.value > sysctl_max_tx_window)
417 qos->window_size.value = sysctl_max_tx_window;
418 }
419
420 /*
421 * Function irlap_negotiate (qos_device, qos_session, skb)
422 *
423 * Negotiate QoS values, not really that much negotiation :-)
424 * We just set the QoS capabilities for the peer station
425 *
426 */
irlap_qos_negotiate(struct irlap_cb * self,struct sk_buff * skb)427 int irlap_qos_negotiate(struct irlap_cb *self, struct sk_buff *skb)
428 {
429 int ret;
430
431 ret = irda_param_extract_all(self, skb->data, skb->len,
432 &irlap_param_info);
433
434 /* Convert the negotiated bits to values */
435 irda_qos_bits_to_value(&self->qos_tx);
436 irda_qos_bits_to_value(&self->qos_rx);
437
438 irlap_adjust_qos_settings(&self->qos_tx);
439
440 pr_debug("Setting BAUD_RATE to %d bps.\n",
441 self->qos_tx.baud_rate.value);
442 pr_debug("Setting DATA_SIZE to %d bytes\n",
443 self->qos_tx.data_size.value);
444 pr_debug("Setting WINDOW_SIZE to %d\n",
445 self->qos_tx.window_size.value);
446 pr_debug("Setting XBOFS to %d\n",
447 self->qos_tx.additional_bofs.value);
448 pr_debug("Setting MAX_TURN_TIME to %d ms.\n",
449 self->qos_tx.max_turn_time.value);
450 pr_debug("Setting MIN_TURN_TIME to %d usecs.\n",
451 self->qos_tx.min_turn_time.value);
452 pr_debug("Setting LINK_DISC to %d secs.\n",
453 self->qos_tx.link_disc_time.value);
454 return ret;
455 }
456
457 /*
458 * Function irlap_insert_negotiation_params (qos, fp)
459 *
460 * Insert QoS negotiaion pararameters into frame
461 *
462 */
irlap_insert_qos_negotiation_params(struct irlap_cb * self,struct sk_buff * skb)463 int irlap_insert_qos_negotiation_params(struct irlap_cb *self,
464 struct sk_buff *skb)
465 {
466 int ret;
467
468 /* Insert data rate */
469 ret = irda_param_insert(self, PI_BAUD_RATE, skb_tail_pointer(skb),
470 skb_tailroom(skb), &irlap_param_info);
471 if (ret < 0)
472 return ret;
473 skb_put(skb, ret);
474
475 /* Insert max turnaround time */
476 ret = irda_param_insert(self, PI_MAX_TURN_TIME, skb_tail_pointer(skb),
477 skb_tailroom(skb), &irlap_param_info);
478 if (ret < 0)
479 return ret;
480 skb_put(skb, ret);
481
482 /* Insert data size */
483 ret = irda_param_insert(self, PI_DATA_SIZE, skb_tail_pointer(skb),
484 skb_tailroom(skb), &irlap_param_info);
485 if (ret < 0)
486 return ret;
487 skb_put(skb, ret);
488
489 /* Insert window size */
490 ret = irda_param_insert(self, PI_WINDOW_SIZE, skb_tail_pointer(skb),
491 skb_tailroom(skb), &irlap_param_info);
492 if (ret < 0)
493 return ret;
494 skb_put(skb, ret);
495
496 /* Insert additional BOFs */
497 ret = irda_param_insert(self, PI_ADD_BOFS, skb_tail_pointer(skb),
498 skb_tailroom(skb), &irlap_param_info);
499 if (ret < 0)
500 return ret;
501 skb_put(skb, ret);
502
503 /* Insert minimum turnaround time */
504 ret = irda_param_insert(self, PI_MIN_TURN_TIME, skb_tail_pointer(skb),
505 skb_tailroom(skb), &irlap_param_info);
506 if (ret < 0)
507 return ret;
508 skb_put(skb, ret);
509
510 /* Insert link disconnect/threshold time */
511 ret = irda_param_insert(self, PI_LINK_DISC, skb_tail_pointer(skb),
512 skb_tailroom(skb), &irlap_param_info);
513 if (ret < 0)
514 return ret;
515 skb_put(skb, ret);
516
517 return 0;
518 }
519
520 /*
521 * Function irlap_param_baud_rate (instance, param, get)
522 *
523 * Negotiate data-rate
524 *
525 */
irlap_param_baud_rate(void * instance,irda_param_t * param,int get)526 static int irlap_param_baud_rate(void *instance, irda_param_t *param, int get)
527 {
528 __u16 final;
529
530 struct irlap_cb *self = (struct irlap_cb *) instance;
531
532 IRDA_ASSERT(self != NULL, return -1;);
533 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
534
535 if (get) {
536 param->pv.i = self->qos_rx.baud_rate.bits;
537 pr_debug("%s(), baud rate = 0x%02x\n",
538 __func__, param->pv.i);
539 } else {
540 /*
541 * Stations must agree on baud rate, so calculate
542 * intersection
543 */
544 pr_debug("Requested BAUD_RATE: 0x%04x\n", (__u16)param->pv.i);
545 final = (__u16) param->pv.i & self->qos_rx.baud_rate.bits;
546
547 pr_debug("Final BAUD_RATE: 0x%04x\n", final);
548 self->qos_tx.baud_rate.bits = final;
549 self->qos_rx.baud_rate.bits = final;
550 }
551
552 return 0;
553 }
554
555 /*
556 * Function irlap_param_link_disconnect (instance, param, get)
557 *
558 * Negotiate link disconnect/threshold time.
559 *
560 */
irlap_param_link_disconnect(void * instance,irda_param_t * param,int get)561 static int irlap_param_link_disconnect(void *instance, irda_param_t *param,
562 int get)
563 {
564 __u16 final;
565
566 struct irlap_cb *self = (struct irlap_cb *) instance;
567
568 IRDA_ASSERT(self != NULL, return -1;);
569 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
570
571 if (get)
572 param->pv.i = self->qos_rx.link_disc_time.bits;
573 else {
574 /*
575 * Stations must agree on link disconnect/threshold
576 * time.
577 */
578 pr_debug("LINK_DISC: %02x\n", (__u8)param->pv.i);
579 final = (__u8) param->pv.i & self->qos_rx.link_disc_time.bits;
580
581 pr_debug("Final LINK_DISC: %02x\n", final);
582 self->qos_tx.link_disc_time.bits = final;
583 self->qos_rx.link_disc_time.bits = final;
584 }
585 return 0;
586 }
587
588 /*
589 * Function irlap_param_max_turn_time (instance, param, get)
590 *
591 * Negotiate the maximum turnaround time. This is a type 1 parameter and
592 * will be negotiated independently for each station
593 *
594 */
irlap_param_max_turn_time(void * instance,irda_param_t * param,int get)595 static int irlap_param_max_turn_time(void *instance, irda_param_t *param,
596 int get)
597 {
598 struct irlap_cb *self = (struct irlap_cb *) instance;
599
600 IRDA_ASSERT(self != NULL, return -1;);
601 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
602
603 if (get)
604 param->pv.i = self->qos_rx.max_turn_time.bits;
605 else
606 self->qos_tx.max_turn_time.bits = (__u8) param->pv.i;
607
608 return 0;
609 }
610
611 /*
612 * Function irlap_param_data_size (instance, param, get)
613 *
614 * Negotiate the data size. This is a type 1 parameter and
615 * will be negotiated independently for each station
616 *
617 */
irlap_param_data_size(void * instance,irda_param_t * param,int get)618 static int irlap_param_data_size(void *instance, irda_param_t *param, int get)
619 {
620 struct irlap_cb *self = (struct irlap_cb *) instance;
621
622 IRDA_ASSERT(self != NULL, return -1;);
623 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
624
625 if (get)
626 param->pv.i = self->qos_rx.data_size.bits;
627 else
628 self->qos_tx.data_size.bits = (__u8) param->pv.i;
629
630 return 0;
631 }
632
633 /*
634 * Function irlap_param_window_size (instance, param, get)
635 *
636 * Negotiate the window size. This is a type 1 parameter and
637 * will be negotiated independently for each station
638 *
639 */
irlap_param_window_size(void * instance,irda_param_t * param,int get)640 static int irlap_param_window_size(void *instance, irda_param_t *param,
641 int get)
642 {
643 struct irlap_cb *self = (struct irlap_cb *) instance;
644
645 IRDA_ASSERT(self != NULL, return -1;);
646 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
647
648 if (get)
649 param->pv.i = self->qos_rx.window_size.bits;
650 else
651 self->qos_tx.window_size.bits = (__u8) param->pv.i;
652
653 return 0;
654 }
655
656 /*
657 * Function irlap_param_additional_bofs (instance, param, get)
658 *
659 * Negotiate additional BOF characters. This is a type 1 parameter and
660 * will be negotiated independently for each station.
661 */
irlap_param_additional_bofs(void * instance,irda_param_t * param,int get)662 static int irlap_param_additional_bofs(void *instance, irda_param_t *param, int get)
663 {
664 struct irlap_cb *self = (struct irlap_cb *) instance;
665
666 IRDA_ASSERT(self != NULL, return -1;);
667 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
668
669 if (get)
670 param->pv.i = self->qos_rx.additional_bofs.bits;
671 else
672 self->qos_tx.additional_bofs.bits = (__u8) param->pv.i;
673
674 return 0;
675 }
676
677 /*
678 * Function irlap_param_min_turn_time (instance, param, get)
679 *
680 * Negotiate the minimum turn around time. This is a type 1 parameter and
681 * will be negotiated independently for each station
682 */
irlap_param_min_turn_time(void * instance,irda_param_t * param,int get)683 static int irlap_param_min_turn_time(void *instance, irda_param_t *param,
684 int get)
685 {
686 struct irlap_cb *self = (struct irlap_cb *) instance;
687
688 IRDA_ASSERT(self != NULL, return -1;);
689 IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
690
691 if (get)
692 param->pv.i = self->qos_rx.min_turn_time.bits;
693 else
694 self->qos_tx.min_turn_time.bits = (__u8) param->pv.i;
695
696 return 0;
697 }
698
699 /*
700 * Function irlap_max_line_capacity (speed, max_turn_time, min_turn_time)
701 *
702 * Calculate the maximum line capacity
703 *
704 */
irlap_max_line_capacity(__u32 speed,__u32 max_turn_time)705 __u32 irlap_max_line_capacity(__u32 speed, __u32 max_turn_time)
706 {
707 __u32 line_capacity;
708 int i,j;
709
710 pr_debug("%s(), speed=%d, max_turn_time=%d\n",
711 __func__, speed, max_turn_time);
712
713 i = value_index(speed, baud_rates, 10);
714 j = value_index(max_turn_time, max_turn_times, 4);
715
716 IRDA_ASSERT(((i >=0) && (i <10)), return 0;);
717 IRDA_ASSERT(((j >=0) && (j <4)), return 0;);
718
719 line_capacity = max_line_capacities[i][j];
720
721 pr_debug("%s(), line capacity=%d bytes\n",
722 __func__, line_capacity);
723
724 return line_capacity;
725 }
726
727 #ifndef CONFIG_IRDA_DYNAMIC_WINDOW
irlap_requested_line_capacity(struct qos_info * qos)728 static __u32 irlap_requested_line_capacity(struct qos_info *qos)
729 {
730 __u32 line_capacity;
731
732 line_capacity = qos->window_size.value *
733 (qos->data_size.value + 6 + qos->additional_bofs.value) +
734 irlap_min_turn_time_in_bytes(qos->baud_rate.value,
735 qos->min_turn_time.value);
736
737 pr_debug("%s(), requested line capacity=%d\n",
738 __func__, line_capacity);
739
740 return line_capacity;
741 }
742 #endif
743
irda_qos_bits_to_value(struct qos_info * qos)744 void irda_qos_bits_to_value(struct qos_info *qos)
745 {
746 int index;
747
748 IRDA_ASSERT(qos != NULL, return;);
749
750 index = msb_index(qos->baud_rate.bits);
751 qos->baud_rate.value = baud_rates[index];
752
753 index = msb_index(qos->data_size.bits);
754 qos->data_size.value = data_sizes[index];
755
756 index = msb_index(qos->window_size.bits);
757 qos->window_size.value = index+1;
758
759 index = msb_index(qos->min_turn_time.bits);
760 qos->min_turn_time.value = min_turn_times[index];
761
762 index = msb_index(qos->max_turn_time.bits);
763 qos->max_turn_time.value = max_turn_times[index];
764
765 index = msb_index(qos->link_disc_time.bits);
766 qos->link_disc_time.value = link_disc_times[index];
767
768 index = msb_index(qos->additional_bofs.bits);
769 qos->additional_bofs.value = add_bofs[index];
770 }
771 EXPORT_SYMBOL(irda_qos_bits_to_value);
772