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/*********************************************************************
*
* Filename: qos.c
* Version: 1.0
* Description: IrLAP QoS parameter negotiation
* Status: Stable
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Tue Sep 9 00:00:26 1997
* Modified at: Sun Jan 30 14:29:16 2000
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>,
* All Rights Reserved.
* Copyright (c) 2000-2001 Jean Tourrilhes <jt@hpl.hp.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
********************************************************************/
#include <linux/export.h>
#include <asm/byteorder.h>
#include <net/irda/irda.h>
#include <net/irda/parameters.h>
#include <net/irda/qos.h>
#include <net/irda/irlap.h>
#include <net/irda/irlap_frame.h>
/*
* Maximum values of the baud rate we negotiate with the other end.
* Most often, you don't have to change that, because Linux-IrDA will
* use the maximum offered by the link layer, which usually works fine.
* In some very rare cases, you may want to limit it to lower speeds...
*/
int sysctl_max_baud_rate = 16000000;
/*
* Maximum value of the lap disconnect timer we negotiate with the other end.
* Most often, the value below represent the best compromise, but some user
* may want to keep the LAP alive longer or shorter in case of link failure.
* Remember that the threshold time (early warning) is fixed to 3s...
*/
int sysctl_max_noreply_time = 12;
/*
* Minimum turn time to be applied before transmitting to the peer.
* Nonzero values (usec) are used as lower limit to the per-connection
* mtt value which was announced by the other end during negotiation.
* Might be helpful if the peer device provides too short mtt.
* Default is 10us which means using the unmodified value given by the
* peer except if it's 0 (0 is likely a bug in the other stack).
*/
unsigned int sysctl_min_tx_turn_time = 10;
/*
* Maximum data size to be used in transmission in payload of LAP frame.
* There is a bit of confusion in the IrDA spec :
* The LAP spec defines the payload of a LAP frame (I field) to be
* 2048 bytes max (IrLAP 1.1, chapt 6.6.5, p40).
* On the other hand, the PHY mention frames of 2048 bytes max (IrPHY
* 1.2, chapt 5.3.2.1, p41). But, this number includes the LAP header
* (2 bytes), and CRC (32 bits at 4 Mb/s). So, for the I field (LAP
* payload), that's only 2042 bytes. Oups !
* My nsc-ircc hardware has troubles receiving 2048 bytes frames at 4 Mb/s,
* so adjust to 2042... I don't know if this bug applies only for 2048
* bytes frames or all negotiated frame sizes, but you can use the sysctl
* to play with this value anyway.
* Jean II */
unsigned int sysctl_max_tx_data_size = 2042;
/*
* Maximum transmit window, i.e. number of LAP frames between turn-around.
* This allow to override what the peer told us. Some peers are buggy and
* don't always support what they tell us.
* Jean II */
unsigned int sysctl_max_tx_window = 7;
static int irlap_param_baud_rate(void *instance, irda_param_t *param, int get);
static int irlap_param_link_disconnect(void *instance, irda_param_t *parm,
int get);
static int irlap_param_max_turn_time(void *instance, irda_param_t *param,
int get);
static int irlap_param_data_size(void *instance, irda_param_t *param, int get);
static int irlap_param_window_size(void *instance, irda_param_t *param,
int get);
static int irlap_param_additional_bofs(void *instance, irda_param_t *parm,
int get);
static int irlap_param_min_turn_time(void *instance, irda_param_t *param,
int get);
#ifndef CONFIG_IRDA_DYNAMIC_WINDOW
static __u32 irlap_requested_line_capacity(struct qos_info *qos);
#endif
static __u32 min_turn_times[] = { 10000, 5000, 1000, 500, 100, 50, 10, 0 }; /* us */
static __u32 baud_rates[] = { 2400, 9600, 19200, 38400, 57600, 115200, 576000,
1152000, 4000000, 16000000 }; /* bps */
static __u32 data_sizes[] = { 64, 128, 256, 512, 1024, 2048 }; /* bytes */
static __u32 add_bofs[] = { 48, 24, 12, 5, 3, 2, 1, 0 }; /* bytes */
static __u32 max_turn_times[] = { 500, 250, 100, 50 }; /* ms */
static __u32 link_disc_times[] = { 3, 8, 12, 16, 20, 25, 30, 40 }; /* secs */
static __u32 max_line_capacities[10][4] = {
/* 500 ms 250 ms 100 ms 50 ms (max turn time) */
{ 100, 0, 0, 0 }, /* 2400 bps */
{ 400, 0, 0, 0 }, /* 9600 bps */
{ 800, 0, 0, 0 }, /* 19200 bps */
{ 1600, 0, 0, 0 }, /* 38400 bps */
{ 2360, 0, 0, 0 }, /* 57600 bps */
{ 4800, 2400, 960, 480 }, /* 115200 bps */
{ 28800, 11520, 5760, 2880 }, /* 576000 bps */
{ 57600, 28800, 11520, 5760 }, /* 1152000 bps */
{ 200000, 100000, 40000, 20000 }, /* 4000000 bps */
{ 800000, 400000, 160000, 80000 }, /* 16000000 bps */
};
static const pi_minor_info_t pi_minor_call_table_type_0[] = {
{ NULL, 0 },
/* 01 */{ irlap_param_baud_rate, PV_INTEGER | PV_LITTLE_ENDIAN },
{ NULL, 0 },
{ NULL, 0 },
{ NULL, 0 },
{ NULL, 0 },
{ NULL, 0 },
{ NULL, 0 },
/* 08 */{ irlap_param_link_disconnect, PV_INT_8_BITS }
};
static const pi_minor_info_t pi_minor_call_table_type_1[] = {
{ NULL, 0 },
{ NULL, 0 },
/* 82 */{ irlap_param_max_turn_time, PV_INT_8_BITS },
/* 83 */{ irlap_param_data_size, PV_INT_8_BITS },
/* 84 */{ irlap_param_window_size, PV_INT_8_BITS },
/* 85 */{ irlap_param_additional_bofs, PV_INT_8_BITS },
/* 86 */{ irlap_param_min_turn_time, PV_INT_8_BITS },
};
static const pi_major_info_t pi_major_call_table[] = {
{ pi_minor_call_table_type_0, 9 },
{ pi_minor_call_table_type_1, 7 },
};
static pi_param_info_t irlap_param_info = { pi_major_call_table, 2, 0x7f, 7 };
/* ---------------------- LOCAL SUBROUTINES ---------------------- */
/* Note : we start with a bunch of local subroutines.
* As the compiler is "one pass", this is the only way to get them to
* inline properly...
* Jean II
*/
/*
* Function value_index (value, array, size)
*
* Returns the index to the value in the specified array
*/
static inline int value_index(__u32 value, __u32 *array, int size)
{
int i;
for (i=0; i < size; i++)
if (array[i] == value)
break;
return i;
}
/*
|