linux/net/irda/qos.c
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   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, 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/export.h>
  34
  35#include <asm/byteorder.h>
  36
  37#include <net/irda/irda.h>
  38#include <net/irda/parameters.h>
  39#include <net/irda/qos.h>
  40#include <net/irda/irlap.h>
  41#include <net/irda/irlap_frame.h>
  42
  43/*
  44 * Maximum values of the baud rate we negotiate with the other end.
  45 * Most often, you don't have to change that, because Linux-IrDA will
  46 * use the maximum offered by the link layer, which usually works fine.
  47 * In some very rare cases, you may want to limit it to lower speeds...
  48 */
  49int sysctl_max_baud_rate = 16000000;
  50/*
  51 * Maximum value of the lap disconnect timer we negotiate with the other end.
  52 * Most often, the value below represent the best compromise, but some user
  53 * may want to keep the LAP alive longer or shorter in case of link failure.
  54 * Remember that the threshold time (early warning) is fixed to 3s...
  55 */
  56int sysctl_max_noreply_time = 12;
  57/*
  58 * Minimum turn time to be applied before transmitting to the peer.
  59 * Nonzero values (usec) are used as lower limit to the per-connection
  60 * mtt value which was announced by the other end during negotiation.
  61 * Might be helpful if the peer device provides too short mtt.
  62 * Default is 10us which means using the unmodified value given by the
  63 * peer except if it's 0 (0 is likely a bug in the other stack).
  64 */
  65unsigned int sysctl_min_tx_turn_time = 10;
  66/*
  67 * Maximum data size to be used in transmission in payload of LAP frame.
  68 * There is a bit of confusion in the IrDA spec :
  69 * The LAP spec defines the payload of a LAP frame (I field) to be
  70 * 2048 bytes max (IrLAP 1.1, chapt 6.6.5, p40).
  71 * On the other hand, the PHY mention frames of 2048 bytes max (IrPHY
  72 * 1.2, chapt 5.3.2.1, p41). But, this number includes the LAP header
  73 * (2 bytes), and CRC (32 bits at 4 Mb/s). So, for the I field (LAP
  74 * payload), that's only 2042 bytes. Oups !
  75 * My nsc-ircc hardware has troubles receiving 2048 bytes frames at 4 Mb/s,
  76 * so adjust to 2042... I don't know if this bug applies only for 2048
  77 * bytes frames or all negotiated frame sizes, but you can use the sysctl
  78 * to play with this value anyway.
  79 * Jean II */
  80unsigned int sysctl_max_tx_data_size = 2042;
  81/*
  82 * Maximum transmit window, i.e. number of LAP frames between turn-around.
  83 * This allow to override what the peer told us. Some peers are buggy and
  84 * don't always support what they tell us.
  85 * Jean II */
  86unsigned int sysctl_max_tx_window = 7;
  87
  88static int irlap_param_baud_rate(void *instance, irda_param_t *param, int get);
  89static int irlap_param_link_disconnect(void *instance, irda_param_t *parm,
  90                                       int get);
  91static int irlap_param_max_turn_time(void *instance, irda_param_t *param,
  92                                     int get);
  93static int irlap_param_data_size(void *instance, irda_param_t *param, int get);
  94static int irlap_param_window_size(void *instance, irda_param_t *param,
  95                                   int get);
  96static int irlap_param_additional_bofs(void *instance, irda_param_t *parm,
  97                                       int get);
  98static int irlap_param_min_turn_time(void *instance, irda_param_t *param,
  99                                     int get);
 100
 101#ifndef CONFIG_IRDA_DYNAMIC_WINDOW
 102static __u32 irlap_requested_line_capacity(struct qos_info *qos);
 103#endif
 104
 105static __u32 min_turn_times[]  = { 10000, 5000, 1000, 500, 100, 50, 10, 0 }; /* us */
 106static __u32 baud_rates[]      = { 2400, 9600, 19200, 38400, 57600, 115200, 576000,
 107                                   1152000, 4000000, 16000000 };           /* bps */
 108static __u32 data_sizes[]      = { 64, 128, 256, 512, 1024, 2048 };        /* bytes */
 109static __u32 add_bofs[]        = { 48, 24, 12, 5, 3, 2, 1, 0 };            /* bytes */
 110static __u32 max_turn_times[]  = { 500, 250, 100, 50 };                    /* ms */
 111static __u32 link_disc_times[] = { 3, 8, 12, 16, 20, 25, 30, 40 };         /* secs */
 112
 113static __u32 max_line_capacities[10][4] = {
 114       /* 500 ms     250 ms  100 ms  50 ms (max turn time) */
 115        {    100,      0,      0,     0 }, /*     2400 bps */
 116        {    400,      0,      0,     0 }, /*     9600 bps */
 117        {    800,      0,      0,     0 }, /*    19200 bps */
 118        {   1600,      0,      0,     0 }, /*    38400 bps */
 119        {   2360,      0,      0,     0 }, /*    57600 bps */
 120        {   4800,   2400,    960,   480 }, /*   115200 bps */
 121        {  28800,  11520,   5760,  2880 }, /*   576000 bps */
 122        {  57600,  28800,  11520,  5760 }, /*  1152000 bps */
 123        { 200000, 100000,  40000, 20000 }, /*  4000000 bps */
 124        { 800000, 400000, 160000, 80000 }, /* 16000000 bps */
 125};
 126
 127static pi_minor_info_t pi_minor_call_table_type_0[] = {
 128        { NULL, 0 },
 129/* 01 */{ irlap_param_baud_rate,       PV_INTEGER | PV_LITTLE_ENDIAN },
 130        { NULL, 0 },
 131        { NULL, 0 },
 132        { NULL, 0 },
 133        { NULL, 0 },
 134        { NULL, 0 },
 135        { NULL, 0 },
 136/* 08 */{ irlap_param_link_disconnect, PV_INT_8_BITS }
 137};
 138
 139static pi_minor_info_t pi_minor_call_table_type_1[] = {
 140        { NULL, 0 },
 141        { NULL, 0 },
 142/* 82 */{ irlap_param_max_turn_time,   PV_INT_8_BITS },
 143/* 83 */{ irlap_param_data_size,       PV_INT_8_BITS },
 144/* 84 */{ irlap_param_window_size,     PV_INT_8_BITS },
 145/* 85 */{ irlap_param_additional_bofs, PV_INT_8_BITS },
 146/* 86 */{ irlap_param_min_turn_time,   PV_INT_8_BITS },
 147};
 148
 149static pi_major_info_t pi_major_call_table[] = {
 150        { pi_minor_call_table_type_0, 9 },
 151        { pi_minor_call_table_type_1, 7 },
 152};
 153
 154static pi_param_info_t irlap_param_info = { pi_major_call_table, 2, 0x7f, 7 };
 155
 156/* ---------------------- LOCAL SUBROUTINES ---------------------- */
 157/* Note : we start with a bunch of local subroutines.
 158 * As the compiler is "one pass", this is the only way to get them to
 159 * inline properly...
 160 * Jean II
 161 */
 162/*
 163 * Function value_index (value, array, size)
 164 *
 165 *    Returns the index to the value in the specified array
 166 */
 167static inline int value_index(__u32 value, __u32 *array, int size)
 168{
 169        int i;
 170
 171        for (i=0; i < size; i++)
 172                if (array[i] == value)
 173                        break;
 174        return i;
 175}
 176
 177/*
 178 * Function index_value (index, array)
 179 *
 180 *    Returns value to index in array, easy!
 181 *
 182 */
 183static inline __u32 index_value(int index, __u32 *array)
 184{
 185        return array[index];
 186}
 187
 188/*
 189 * Function msb_index (word)
 190 *
 191 *    Returns index to most significant bit (MSB) in word
 192 *
 193 */
 194static int msb_index (__u16 word)
 195{
 196        __u16 msb = 0x8000;
 197        int index = 15;   /* Current MSB */
 198
 199        /* Check for buggy peers.
 200         * Note : there is a small probability that it could be us, but I
 201         * would expect driver authors to catch that pretty early and be
 202         * able to check precisely what's going on. If a end user sees this,
 203         * it's very likely the peer. - Jean II */
 204        if (word == 0) {
 205                IRDA_WARNING("%s(), Detected buggy peer, adjust null PV to 0x1!\n",
 206                         __func__);
 207                /* The only safe choice (we don't know the array size) */
 208                word = 0x1;
 209        }
 210
 211        while (msb) {
 212                if (word & msb)
 213                        break;   /* Found it! */
 214                msb >>=1;
 215                index--;
 216        }
 217        return index;
 218}
 219
 220/*
 221 * Function value_lower_bits (value, array)
 222 *
 223 *    Returns a bit field marking all possibility lower than value.
 224 */
 225static inline int value_lower_bits(__u32 value, __u32 *array, int size, __u16 *field)
 226{
 227        int     i;
 228        __u16   mask = 0x1;
 229        __u16   result = 0x0;
 230
 231        for (i=0; i < size; i++) {
 232                /* Add the current value to the bit field, shift mask */
 233                result |= mask;
 234                mask <<= 1;
 235                /* Finished ? */
 236                if (array[i] >= value)
 237                        break;
 238        }
 239        /* Send back a valid index */
 240        if(i >= size)
 241          i = size - 1; /* Last item */
 242        *field = result;
 243        return i;
 244}
 245
 246/*
 247 * Function value_highest_bit (value, array)
 248 *
 249 *    Returns a bit field marking the highest possibility lower than value.
 250 */
 251static inline int value_highest_bit(__u32 value, __u32 *array, int size, __u16 *field)
 252{
 253        int     i;
 254        __u16   mask = 0x1;
 255        __u16   result = 0x0;
 256
 257        for (i=0; i < size; i++) {
 258                /* Finished ? */
 259                if (array[i] <= value)
 260                        break;
 261                /* Shift mask */
 262                mask <<= 1;
 263        }
 264        /* Set the current value to the bit field */
 265        result |= mask;
 266        /* Send back a valid index */
 267        if(i >= size)
 268          i = size - 1; /* Last item */
 269        *field = result;
 270        return i;
 271}
 272
 273/* -------------------------- MAIN CALLS -------------------------- */
 274
 275/*
 276 * Function irda_qos_compute_intersection (qos, new)
 277 *
 278 *    Compute the intersection of the old QoS capabilities with new ones
 279 *
 280 */
 281void irda_qos_compute_intersection(struct qos_info *qos, struct qos_info *new)
 282{
 283        IRDA_ASSERT(qos != NULL, return;);
 284        IRDA_ASSERT(new != NULL, return;);
 285
 286        /* Apply */
 287        qos->baud_rate.bits       &= new->baud_rate.bits;
 288        qos->window_size.bits     &= new->window_size.bits;
 289        qos->min_turn_time.bits   &= new->min_turn_time.bits;
 290        qos->max_turn_time.bits   &= new->max_turn_time.bits;
 291        qos->data_size.bits       &= new->data_size.bits;
 292        qos->link_disc_time.bits  &= new->link_disc_time.bits;
 293        qos->additional_bofs.bits &= new->additional_bofs.bits;
 294
 295        irda_qos_bits_to_value(qos);
 296}
 297
 298/*
 299 * Function irda_init_max_qos_capabilies (qos)
 300 *
 301 *    The purpose of this function is for layers and drivers to be able to
 302 *    set the maximum QoS possible and then "and in" their own limitations
 303 *
 304 */
 305void irda_init_max_qos_capabilies(struct qos_info *qos)
 306{
 307        int i;
 308        /*
 309         *  These are the maximum supported values as specified on pages
 310         *  39-43 in IrLAP
 311         */
 312
 313        /* Use sysctl to set some configurable values... */
 314        /* Set configured max speed */
 315        i = value_lower_bits(sysctl_max_baud_rate, baud_rates, 10,
 316                             &qos->baud_rate.bits);
 317        sysctl_max_baud_rate = index_value(i, baud_rates);
 318
 319        /* Set configured max disc time */
 320        i = value_lower_bits(sysctl_max_noreply_time, link_disc_times, 8,
 321                             &qos->link_disc_time.bits);
 322        sysctl_max_noreply_time = index_value(i, link_disc_times);
 323
 324        /* LSB is first byte, MSB is second byte */
 325        qos->baud_rate.bits    &= 0x03ff;
 326
 327        qos->window_size.bits     = 0x7f;
 328        qos->min_turn_time.bits   = 0xff;
 329        qos->max_turn_time.bits   = 0x0f;
 330        qos->data_size.bits       = 0x3f;
 331        qos->link_disc_time.bits &= 0xff;
 332        qos->additional_bofs.bits = 0xff;
 333}
 334EXPORT_SYMBOL(irda_init_max_qos_capabilies);
 335
 336/*
 337 * Function irlap_adjust_qos_settings (qos)
 338 *
 339 *     Adjust QoS settings in case some values are not possible to use because
 340 *     of other settings
 341 */
 342static void irlap_adjust_qos_settings(struct qos_info *qos)
 343{
 344        __u32 line_capacity;
 345        int index;
 346
 347        IRDA_DEBUG(2, "%s()\n", __func__);
 348
 349        /*
 350         * Make sure the mintt is sensible.
 351         * Main culprit : Ericsson T39. - Jean II
 352         */
 353        if (sysctl_min_tx_turn_time > qos->min_turn_time.value) {
 354                int i;
 355
 356                IRDA_WARNING("%s(), Detected buggy peer, adjust mtt to %dus!\n",
 357                         __func__, sysctl_min_tx_turn_time);
 358
 359                /* We don't really need bits, but easier this way */
 360                i = value_highest_bit(sysctl_min_tx_turn_time, min_turn_times,
 361                                      8, &qos->min_turn_time.bits);
 362                sysctl_min_tx_turn_time = index_value(i, min_turn_times);
 363                qos->min_turn_time.value = sysctl_min_tx_turn_time;
 364        }
 365
 366        /*
 367         * Not allowed to use a max turn time less than 500 ms if the baudrate
 368         * is less than 115200
 369         */
 370        if ((qos->baud_rate.value < 115200) &&
 371            (qos->max_turn_time.value < 500))
 372        {
 373                IRDA_DEBUG(0,
 374                           "%s(), adjusting max turn time from %d to 500 ms\n",
 375                           __func__, qos->max_turn_time.value);
 376                qos->max_turn_time.value = 500;
 377        }
 378
 379        /*
 380         * The data size must be adjusted according to the baud rate and max
 381         * turn time
 382         */
 383        index = value_index(qos->data_size.value, data_sizes, 6);
 384        line_capacity = irlap_max_line_capacity(qos->baud_rate.value,
 385                                                qos->max_turn_time.value);
 386
 387#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
 388        while ((qos->data_size.value > line_capacity) && (index > 0)) {
 389                qos->data_size.value = data_sizes[index--];
 390                IRDA_DEBUG(2, "%s(), reducing data size to %d\n",
 391                           __func__, qos->data_size.value);
 392        }
 393#else /* Use method described in section 6.6.11 of IrLAP */
 394        while (irlap_requested_line_capacity(qos) > line_capacity) {
 395                IRDA_ASSERT(index != 0, return;);
 396
 397                /* Must be able to send at least one frame */
 398                if (qos->window_size.value > 1) {
 399                        qos->window_size.value--;
 400                        IRDA_DEBUG(2, "%s(), reducing window size to %d\n",
 401                                   __func__, qos->window_size.value);
 402                } else if (index > 1) {
 403                        qos->data_size.value = data_sizes[index--];
 404                        IRDA_DEBUG(2, "%s(), reducing data size to %d\n",
 405                                   __func__, qos->data_size.value);
 406                } else {
 407                        IRDA_WARNING("%s(), nothing more we can do!\n",
 408                                     __func__);
 409                }
 410        }
 411#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
 412        /*
 413         * Fix tx data size according to user limits - Jean II
 414         */
 415        if (qos->data_size.value > sysctl_max_tx_data_size)
 416                /* Allow non discrete adjustement to avoid losing capacity */
 417                qos->data_size.value = sysctl_max_tx_data_size;
 418        /*
 419         * Override Tx window if user request it. - Jean II
 420         */
 421        if (qos->window_size.value > sysctl_max_tx_window)
 422                qos->window_size.value = sysctl_max_tx_window;
 423}
 424
 425/*
 426 * Function irlap_negotiate (qos_device, qos_session, skb)
 427 *
 428 *    Negotiate QoS values, not really that much negotiation :-)
 429 *    We just set the QoS capabilities for the peer station
 430 *
 431 */
 432int irlap_qos_negotiate(struct irlap_cb *self, struct sk_buff *skb)
 433{
 434        int ret;
 435
 436        ret = irda_param_extract_all(self, skb->data, skb->len,
 437                                     &irlap_param_info);
 438
 439        /* Convert the negotiated bits to values */
 440        irda_qos_bits_to_value(&self->qos_tx);
 441        irda_qos_bits_to_value(&self->qos_rx);
 442
 443        irlap_adjust_qos_settings(&self->qos_tx);
 444
 445        IRDA_DEBUG(2, "Setting BAUD_RATE to %d bps.\n",
 446                   self->qos_tx.baud_rate.value);
 447        IRDA_DEBUG(2, "Setting DATA_SIZE to %d bytes\n",
 448                   self->qos_tx.data_size.value);
 449        IRDA_DEBUG(2, "Setting WINDOW_SIZE to %d\n",
 450                   self->qos_tx.window_size.value);
 451        IRDA_DEBUG(2, "Setting XBOFS to %d\n",
 452                   self->qos_tx.additional_bofs.value);
 453        IRDA_DEBUG(2, "Setting MAX_TURN_TIME to %d ms.\n",
 454                   self->qos_tx.max_turn_time.value);
 455        IRDA_DEBUG(2, "Setting MIN_TURN_TIME to %d usecs.\n",
 456                   self->qos_tx.min_turn_time.value);
 457        IRDA_DEBUG(2, "Setting LINK_DISC to %d secs.\n",
 458                   self->qos_tx.link_disc_time.value);
 459        return ret;
 460}
 461
 462/*
 463 * Function irlap_insert_negotiation_params (qos, fp)
 464 *
 465 *    Insert QoS negotiaion pararameters into frame
 466 *
 467 */
 468int irlap_insert_qos_negotiation_params(struct irlap_cb *self,
 469                                        struct sk_buff *skb)
 470{
 471        int ret;
 472
 473        /* Insert data rate */
 474        ret = irda_param_insert(self, PI_BAUD_RATE, skb_tail_pointer(skb),
 475                                skb_tailroom(skb), &irlap_param_info);
 476        if (ret < 0)
 477                return ret;
 478        skb_put(skb, ret);
 479
 480        /* Insert max turnaround time */
 481        ret = irda_param_insert(self, PI_MAX_TURN_TIME, skb_tail_pointer(skb),
 482                                skb_tailroom(skb), &irlap_param_info);
 483        if (ret < 0)
 484                return ret;
 485        skb_put(skb, ret);
 486
 487        /* Insert data size */
 488        ret = irda_param_insert(self, PI_DATA_SIZE, skb_tail_pointer(skb),
 489                                skb_tailroom(skb), &irlap_param_info);
 490        if (ret < 0)
 491                return ret;
 492        skb_put(skb, ret);
 493
 494        /* Insert window size */
 495        ret = irda_param_insert(self, PI_WINDOW_SIZE, skb_tail_pointer(skb),
 496                                skb_tailroom(skb), &irlap_param_info);
 497        if (ret < 0)
 498                return ret;
 499        skb_put(skb, ret);
 500
 501        /* Insert additional BOFs */
 502        ret = irda_param_insert(self, PI_ADD_BOFS, skb_tail_pointer(skb),
 503                                skb_tailroom(skb), &irlap_param_info);
 504        if (ret < 0)
 505                return ret;
 506        skb_put(skb, ret);
 507
 508        /* Insert minimum turnaround time */
 509        ret = irda_param_insert(self, PI_MIN_TURN_TIME, skb_tail_pointer(skb),
 510                                skb_tailroom(skb), &irlap_param_info);
 511        if (ret < 0)
 512                return ret;
 513        skb_put(skb, ret);
 514
 515        /* Insert link disconnect/threshold time */
 516        ret = irda_param_insert(self, PI_LINK_DISC, skb_tail_pointer(skb),
 517                                skb_tailroom(skb), &irlap_param_info);
 518        if (ret < 0)
 519                return ret;
 520        skb_put(skb, ret);
 521
 522        return 0;
 523}
 524
 525/*
 526 * Function irlap_param_baud_rate (instance, param, get)
 527 *
 528 *    Negotiate data-rate
 529 *
 530 */
 531static int irlap_param_baud_rate(void *instance, irda_param_t *param, int get)
 532{
 533        __u16 final;
 534
 535        struct irlap_cb *self = (struct irlap_cb *) instance;
 536
 537        IRDA_ASSERT(self != NULL, return -1;);
 538        IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
 539
 540        if (get) {
 541                param->pv.i = self->qos_rx.baud_rate.bits;
 542                IRDA_DEBUG(2, "%s(), baud rate = 0x%02x\n",
 543                           __func__, param->pv.i);
 544        } else {
 545                /*
 546                 *  Stations must agree on baud rate, so calculate
 547                 *  intersection
 548                 */
 549                IRDA_DEBUG(2, "Requested BAUD_RATE: 0x%04x\n", (__u16) param->pv.i);
 550                final = (__u16) param->pv.i & self->qos_rx.baud_rate.bits;
 551
 552                IRDA_DEBUG(2, "Final BAUD_RATE: 0x%04x\n", final);
 553                self->qos_tx.baud_rate.bits = final;
 554                self->qos_rx.baud_rate.bits = final;
 555        }
 556
 557        return 0;
 558}
 559
 560/*
 561 * Function irlap_param_link_disconnect (instance, param, get)
 562 *
 563 *    Negotiate link disconnect/threshold time.
 564 *
 565 */
 566static int irlap_param_link_disconnect(void *instance, irda_param_t *param,
 567                                       int get)
 568{
 569        __u16 final;
 570
 571        struct irlap_cb *self = (struct irlap_cb *) instance;
 572
 573        IRDA_ASSERT(self != NULL, return -1;);
 574        IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
 575
 576        if (get)
 577                param->pv.i = self->qos_rx.link_disc_time.bits;
 578        else {
 579                /*
 580                 *  Stations must agree on link disconnect/threshold
 581                 *  time.
 582                 */
 583                IRDA_DEBUG(2, "LINK_DISC: %02x\n", (__u8) param->pv.i);
 584                final = (__u8) param->pv.i & self->qos_rx.link_disc_time.bits;
 585
 586                IRDA_DEBUG(2, "Final LINK_DISC: %02x\n", final);
 587                self->qos_tx.link_disc_time.bits = final;
 588                self->qos_rx.link_disc_time.bits = final;
 589        }
 590        return 0;
 591}
 592
 593/*
 594 * Function irlap_param_max_turn_time (instance, param, get)
 595 *
 596 *    Negotiate the maximum turnaround time. This is a type 1 parameter and
 597 *    will be negotiated independently for each station
 598 *
 599 */
 600static int irlap_param_max_turn_time(void *instance, irda_param_t *param,
 601                                     int get)
 602{
 603        struct irlap_cb *self = (struct irlap_cb *) instance;
 604
 605        IRDA_ASSERT(self != NULL, return -1;);
 606        IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
 607
 608        if (get)
 609                param->pv.i = self->qos_rx.max_turn_time.bits;
 610        else
 611                self->qos_tx.max_turn_time.bits = (__u8) param->pv.i;
 612
 613        return 0;
 614}
 615
 616/*
 617 * Function irlap_param_data_size (instance, param, get)
 618 *
 619 *    Negotiate the data size. This is a type 1 parameter and
 620 *    will be negotiated independently for each station
 621 *
 622 */
 623static int irlap_param_data_size(void *instance, irda_param_t *param, int get)
 624{
 625        struct irlap_cb *self = (struct irlap_cb *) instance;
 626
 627        IRDA_ASSERT(self != NULL, return -1;);
 628        IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
 629
 630        if (get)
 631                param->pv.i = self->qos_rx.data_size.bits;
 632        else
 633                self->qos_tx.data_size.bits = (__u8) param->pv.i;
 634
 635        return 0;
 636}
 637
 638/*
 639 * Function irlap_param_window_size (instance, param, get)
 640 *
 641 *    Negotiate the window size. This is a type 1 parameter and
 642 *    will be negotiated independently for each station
 643 *
 644 */
 645static int irlap_param_window_size(void *instance, irda_param_t *param,
 646                                   int get)
 647{
 648        struct irlap_cb *self = (struct irlap_cb *) instance;
 649
 650        IRDA_ASSERT(self != NULL, return -1;);
 651        IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
 652
 653        if (get)
 654                param->pv.i = self->qos_rx.window_size.bits;
 655        else
 656                self->qos_tx.window_size.bits = (__u8) param->pv.i;
 657
 658        return 0;
 659}
 660
 661/*
 662 * Function irlap_param_additional_bofs (instance, param, get)
 663 *
 664 *    Negotiate additional BOF characters. This is a type 1 parameter and
 665 *    will be negotiated independently for each station.
 666 */
 667static int irlap_param_additional_bofs(void *instance, irda_param_t *param, int get)
 668{
 669        struct irlap_cb *self = (struct irlap_cb *) instance;
 670
 671        IRDA_ASSERT(self != NULL, return -1;);
 672        IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
 673
 674        if (get)
 675                param->pv.i = self->qos_rx.additional_bofs.bits;
 676        else
 677                self->qos_tx.additional_bofs.bits = (__u8) param->pv.i;
 678
 679        return 0;
 680}
 681
 682/*
 683 * Function irlap_param_min_turn_time (instance, param, get)
 684 *
 685 *    Negotiate the minimum turn around time. This is a type 1 parameter and
 686 *    will be negotiated independently for each station
 687 */
 688static int irlap_param_min_turn_time(void *instance, irda_param_t *param,
 689                                     int get)
 690{
 691        struct irlap_cb *self = (struct irlap_cb *) instance;
 692
 693        IRDA_ASSERT(self != NULL, return -1;);
 694        IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
 695
 696        if (get)
 697                param->pv.i = self->qos_rx.min_turn_time.bits;
 698        else
 699                self->qos_tx.min_turn_time.bits = (__u8) param->pv.i;
 700
 701        return 0;
 702}
 703
 704/*
 705 * Function irlap_max_line_capacity (speed, max_turn_time, min_turn_time)
 706 *
 707 *    Calculate the maximum line capacity
 708 *
 709 */
 710__u32 irlap_max_line_capacity(__u32 speed, __u32 max_turn_time)
 711{
 712        __u32 line_capacity;
 713        int i,j;
 714
 715        IRDA_DEBUG(2, "%s(), speed=%d, max_turn_time=%d\n",
 716                   __func__, speed, max_turn_time);
 717
 718        i = value_index(speed, baud_rates, 10);
 719        j = value_index(max_turn_time, max_turn_times, 4);
 720
 721        IRDA_ASSERT(((i >=0) && (i <10)), return 0;);
 722        IRDA_ASSERT(((j >=0) && (j <4)), return 0;);
 723
 724        line_capacity = max_line_capacities[i][j];
 725
 726        IRDA_DEBUG(2, "%s(), line capacity=%d bytes\n",
 727                   __func__, line_capacity);
 728
 729        return line_capacity;
 730}
 731
 732#ifndef CONFIG_IRDA_DYNAMIC_WINDOW
 733static __u32 irlap_requested_line_capacity(struct qos_info *qos)
 734{
 735        __u32 line_capacity;
 736
 737        line_capacity = qos->window_size.value *
 738                (qos->data_size.value + 6 + qos->additional_bofs.value) +
 739                irlap_min_turn_time_in_bytes(qos->baud_rate.value,
 740                                             qos->min_turn_time.value);
 741
 742        IRDA_DEBUG(2, "%s(), requested line capacity=%d\n",
 743                   __func__, line_capacity);
 744
 745        return line_capacity;
 746}
 747#endif
 748
 749void irda_qos_bits_to_value(struct qos_info *qos)
 750{
 751        int index;
 752
 753        IRDA_ASSERT(qos != NULL, return;);
 754
 755        index = msb_index(qos->baud_rate.bits);
 756        qos->baud_rate.value = baud_rates[index];
 757
 758        index = msb_index(qos->data_size.bits);
 759        qos->data_size.value = data_sizes[index];
 760
 761        index = msb_index(qos->window_size.bits);
 762        qos->window_size.value = index+1;
 763
 764        index = msb_index(qos->min_turn_time.bits);
 765        qos->min_turn_time.value = min_turn_times[index];
 766
 767        index = msb_index(qos->max_turn_time.bits);
 768        qos->max_turn_time.value = max_turn_times[index];
 769
 770        index = msb_index(qos->link_disc_time.bits);
 771        qos->link_disc_time.value = link_disc_times[index];
 772
 773        index = msb_index(qos->additional_bofs.bits);
 774        qos->additional_bofs.value = add_bofs[index];
 775}
 776EXPORT_SYMBOL(irda_qos_bits_to_value);
 777
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