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 */ 47int 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 */ 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 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 */ 78unsigned 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 */ 84unsigned int 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 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 137static 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 147static 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 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 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 */ 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 /* 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 */ 427int 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 */ 463int 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 */ 526static 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 */ 561static 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 */ 595static 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 */ 618static 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 */ 640static 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 */ 662static 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 */ 683static 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 */ 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 728static __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 744void 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} 771EXPORT_SYMBOL(irda_qos_bits_to_value); 772