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Diffstat (limited to 'net/irda/qos.c')
| -rw-r--r-- | net/irda/qos.c | 774 |
1 files changed, 774 insertions, 0 deletions
diff --git a/net/irda/qos.c b/net/irda/qos.c new file mode 100644 index 0000000..df732d5 --- /dev/null +++ b/net/irda/qos.c @@ -0,0 +1,774 @@ +/********************************************************************* + * + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + ********************************************************************/ + +#include <linux/config.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> + +/* + * Maximum values of the baud rate we negociate 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 negociate with the other end. + * Most often, the value below represent the best compromise, but some user + * may want to keep the LAP alive longuer 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 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 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 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 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 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 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; +} + +/* + * Function index_value (index, array) + * + * Returns value to index in array, easy! + * + */ +static inline __u32 index_value(int index, __u32 *array) +{ + return array[index]; +} + +/* + * Function msb_index (word) + * + * Returns index to most significant bit (MSB) in word + * + */ +static int msb_index (__u16 word) +{ + __u16 msb = 0x8000; + int index = 15; /* Current MSB */ + + /* Check for buggy peers. + * Note : there is a small probability that it could be us, but I + * would expect driver authors to catch that pretty early and be + * able to check precisely what's going on. If a end user sees this, + * it's very likely the peer. - Jean II */ + if (word == 0) { + IRDA_WARNING("%s(), Detected buggy peer, adjust null PV to 0x1!\n", + __FUNCTION__); + /* The only safe choice (we don't know the array size) */ + word = 0x1; + } + + while (msb) { + if (word & msb) + break; /* Found it! */ + msb >>=1; + index--; + } + return index; +} + +/* + * Function value_lower_bits (value, array) + * + * Returns a bit field marking all possibility lower than value. + */ +static inline int value_lower_bits(__u32 value, __u32 *array, int size, __u16 *field) +{ + int i; + __u16 mask = 0x1; + __u16 result = 0x0; + + for (i=0; i < size; i++) { + /* Add the current value to the bit field, shift mask */ + result |= mask; + mask <<= 1; + /* Finished ? */ + if (array[i] >= value) + break; + } + /* Send back a valid index */ + if(i >= size) + i = size - 1; /* Last item */ + *field = result; + return i; +} + +/* + * Function value_highest_bit (value, array) + * + * Returns a bit field marking the highest possibility lower than value. + */ +static inline int value_highest_bit(__u32 value, __u32 *array, int size, __u16 *field) +{ + int i; + __u16 mask = 0x1; + __u16 result = 0x0; + + for (i=0; i < size; i++) { + /* Finished ? */ + if (array[i] <= value) + break; + /* Shift mask */ + mask <<= 1; + } + /* Set the current value to the bit field */ + result |= mask; + /* Send back a valid index */ + if(i >= size) + i = size - 1; /* Last item */ + *field = result; + return i; +} + +/* -------------------------- MAIN CALLS -------------------------- */ + +/* + * Function irda_qos_compute_intersection (qos, new) + * + * Compute the intersection of the old QoS capabilities with new ones + * + */ +void irda_qos_compute_intersection(struct qos_info *qos, struct qos_info *new) +{ + IRDA_ASSERT(qos != NULL, return;); + IRDA_ASSERT(new != NULL, return;); + + /* Apply */ + qos->baud_rate.bits &= new->baud_rate.bits; + qos->window_size.bits &= new->window_size.bits; + qos->min_turn_time.bits &= new->min_turn_time.bits; + qos->max_turn_time.bits &= new->max_turn_time.bits; + qos->data_size.bits &= new->data_size.bits; + qos->link_disc_time.bits &= new->link_disc_time.bits; + qos->additional_bofs.bits &= new->additional_bofs.bits; + + irda_qos_bits_to_value(qos); +} + +/* + * Function irda_init_max_qos_capabilies (qos) + * + * The purpose of this function is for layers and drivers to be able to + * set the maximum QoS possible and then "and in" their own limitations + * + */ +void irda_init_max_qos_capabilies(struct qos_info *qos) +{ + int i; + /* + * These are the maximum supported values as specified on pages + * 39-43 in IrLAP + */ + + /* Use sysctl to set some configurable values... */ + /* Set configured max speed */ + i = value_lower_bits(sysctl_max_baud_rate, baud_rates, 10, + &qos->baud_rate.bits); + sysctl_max_baud_rate = index_value(i, baud_rates); + + /* Set configured max disc time */ + i = value_lower_bits(sysctl_max_noreply_time, link_disc_times, 8, + &qos->link_disc_time.bits); + sysctl_max_noreply_time = index_value(i, link_disc_times); + + /* LSB is first byte, MSB is second byte */ + qos->baud_rate.bits &= 0x03ff; + + qos->window_size.bits = 0x7f; + qos->min_turn_time.bits = 0xff; + qos->max_turn_time.bits = 0x0f; + qos->data_size.bits = 0x3f; + qos->link_disc_time.bits &= 0xff; + qos->additional_bofs.bits = 0xff; +} +EXPORT_SYMBOL(irda_init_max_qos_capabilies); + +/* + * Function irlap_adjust_qos_settings (qos) + * + * Adjust QoS settings in case some values are not possible to use because + * of other settings + */ +static void irlap_adjust_qos_settings(struct qos_info *qos) +{ + __u32 line_capacity; + int index; + + IRDA_DEBUG(2, "%s()\n", __FUNCTION__); + + /* + * Make sure the mintt is sensible. + * Main culprit : Ericsson T39. - Jean II + */ + if (sysctl_min_tx_turn_time > qos->min_turn_time.value) { + int i; + + IRDA_WARNING("%s(), Detected buggy peer, adjust mtt to %dus!\n", + __FUNCTION__, sysctl_min_tx_turn_time); + + /* We don't really need bits, but easier this way */ + i = value_highest_bit(sysctl_min_tx_turn_time, min_turn_times, + 8, &qos->min_turn_time.bits); + sysctl_min_tx_turn_time = index_value(i, min_turn_times); + qos->min_turn_time.value = sysctl_min_tx_turn_time; + } + + /* + * Not allowed to use a max turn time less than 500 ms if the baudrate + * is less than 115200 + */ + if ((qos->baud_rate.value < 115200) && + (qos->max_turn_time.value < 500)) + { + IRDA_DEBUG(0, + "%s(), adjusting max turn time from %d to 500 ms\n", + __FUNCTION__, qos->max_turn_time.value); + qos->max_turn_time.value = 500; + } + + /* + * The data size must be adjusted according to the baud rate and max + * turn time + */ + index = value_index(qos->data_size.value, data_sizes, 6); + line_capacity = irlap_max_line_capacity(qos->baud_rate.value, + qos->max_turn_time.value); + +#ifdef CONFIG_IRDA_DYNAMIC_WINDOW + while ((qos->data_size.value > line_capacity) && (index > 0)) { + qos->data_size.value = data_sizes[index--]; + IRDA_DEBUG(2, "%s(), reducing data size to %d\n", + __FUNCTION__, qos->data_size.value); + } +#else /* Use method described in section 6.6.11 of IrLAP */ + while (irlap_requested_line_capacity(qos) > line_capacity) { + IRDA_ASSERT(index != 0, return;); + + /* Must be able to send at least one frame */ + if (qos->window_size.value > 1) { + qos->window_size.value--; + IRDA_DEBUG(2, "%s(), reducing window size to %d\n", + __FUNCTION__, qos->window_size.value); + } else if (index > 1) { + qos->data_size.value = data_sizes[index--]; + IRDA_DEBUG(2, "%s(), reducing data size to %d\n", + __FUNCTION__, qos->data_size.value); + } else { + IRDA_WARNING("%s(), nothing more we can do!\n", + __FUNCTION__); + } + } +#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ + /* + * Fix tx data size according to user limits - Jean II + */ + if (qos->data_size.value > sysctl_max_tx_data_size) + /* Allow non discrete adjustement to avoid loosing capacity */ + qos->data_size.value = sysctl_max_tx_data_size; + /* + * Override Tx window if user request it. - Jean II + */ + if (qos->window_size.value > sysctl_max_tx_window) + qos->window_size.value = sysctl_max_tx_window; +} + +/* + * Function irlap_negotiate (qos_device, qos_session, skb) + * + * Negotiate QoS values, not really that much negotiation :-) + * We just set the QoS capabilities for the peer station + * + */ +int irlap_qos_negotiate(struct irlap_cb *self, struct sk_buff *skb) +{ + int ret; + + ret = irda_param_extract_all(self, skb->data, skb->len, + &irlap_param_info); + + /* Convert the negotiated bits to values */ + irda_qos_bits_to_value(&self->qos_tx); + irda_qos_bits_to_value(&self->qos_rx); + + irlap_adjust_qos_settings(&self->qos_tx); + + IRDA_DEBUG(2, "Setting BAUD_RATE to %d bps.\n", + self->qos_tx.baud_rate.value); + IRDA_DEBUG(2, "Setting DATA_SIZE to %d bytes\n", + self->qos_tx.data_size.value); + IRDA_DEBUG(2, "Setting WINDOW_SIZE to %d\n", + self->qos_tx.window_size.value); + IRDA_DEBUG(2, "Setting XBOFS to %d\n", + self->qos_tx.additional_bofs.value); + IRDA_DEBUG(2, "Setting MAX_TURN_TIME to %d ms.\n", + self->qos_tx.max_turn_time.value); + IRDA_DEBUG(2, "Setting MIN_TURN_TIME to %d usecs.\n", + self->qos_tx.min_turn_time.value); + IRDA_DEBUG(2, "Setting LINK_DISC to %d secs.\n", + self->qos_tx.link_disc_time.value); + return ret; +} + +/* + * Function irlap_insert_negotiation_params (qos, fp) + * + * Insert QoS negotiaion pararameters into frame + * + */ +int irlap_insert_qos_negotiation_params(struct irlap_cb *self, + struct sk_buff *skb) +{ + int ret; + + /* Insert data rate */ + ret = irda_param_insert(self, PI_BAUD_RATE, skb->tail, + skb_tailroom(skb), &irlap_param_info); + if (ret < 0) + return ret; + skb_put(skb, ret); + + /* Insert max turnaround time */ + ret = irda_param_insert(self, PI_MAX_TURN_TIME, skb->tail, + skb_tailroom(skb), &irlap_param_info); + if (ret < 0) + return ret; + skb_put(skb, ret); + + /* Insert data size */ + ret = irda_param_insert(self, PI_DATA_SIZE, skb->tail, + skb_tailroom(skb), &irlap_param_info); + if (ret < 0) + return ret; + skb_put(skb, ret); + + /* Insert window size */ + ret = irda_param_insert(self, PI_WINDOW_SIZE, skb->tail, + skb_tailroom(skb), &irlap_param_info); + if (ret < 0) + return ret; + skb_put(skb, ret); + + /* Insert additional BOFs */ + ret = irda_param_insert(self, PI_ADD_BOFS, skb->tail, + skb_tailroom(skb), &irlap_param_info); + if (ret < 0) + return ret; + skb_put(skb, ret); + + /* Insert minimum turnaround time */ + ret = irda_param_insert(self, PI_MIN_TURN_TIME, skb->tail, + skb_tailroom(skb), &irlap_param_info); + if (ret < 0) + return ret; + skb_put(skb, ret); + + /* Insert link disconnect/threshold time */ + ret = irda_param_insert(self, PI_LINK_DISC, skb->tail, + skb_tailroom(skb), &irlap_param_info); + if (ret < 0) + return ret; + skb_put(skb, ret); + + return 0; +} + +/* + * Function irlap_param_baud_rate (instance, param, get) + * + * Negotiate data-rate + * + */ +static int irlap_param_baud_rate(void *instance, irda_param_t *param, int get) +{ + __u16 final; + + struct irlap_cb *self = (struct irlap_cb *) instance; + + IRDA_ASSERT(self != NULL, return -1;); + IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); + + if (get) { + param->pv.i = self->qos_rx.baud_rate.bits; + IRDA_DEBUG(2, "%s(), baud rate = 0x%02x\n", + __FUNCTION__, param->pv.i); + } else { + /* + * Stations must agree on baud rate, so calculate + * intersection + */ + IRDA_DEBUG(2, "Requested BAUD_RATE: 0x%04x\n", (__u16) param->pv.i); + final = (__u16) param->pv.i & self->qos_rx.baud_rate.bits; + + IRDA_DEBUG(2, "Final BAUD_RATE: 0x%04x\n", final); + self->qos_tx.baud_rate.bits = final; + self->qos_rx.baud_rate.bits = final; + } + + return 0; +} + +/* + * Function irlap_param_link_disconnect (instance, param, get) + * + * Negotiate link disconnect/threshold time. + * + */ +static int irlap_param_link_disconnect(void *instance, irda_param_t *param, + int get) +{ + __u16 final; + + struct irlap_cb *self = (struct irlap_cb *) instance; + + IRDA_ASSERT(self != NULL, return -1;); + IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); + + if (get) + param->pv.i = self->qos_rx.link_disc_time.bits; + else { + /* + * Stations must agree on link disconnect/threshold + * time. + */ + IRDA_DEBUG(2, "LINK_DISC: %02x\n", (__u8) param->pv.i); + final = (__u8) param->pv.i & self->qos_rx.link_disc_time.bits; + + IRDA_DEBUG(2, "Final LINK_DISC: %02x\n", final); + self->qos_tx.link_disc_time.bits = final; + self->qos_rx.link_disc_time.bits = final; + } + return 0; +} + +/* + * Function irlap_param_max_turn_time (instance, param, get) + * + * Negotiate the maximum turnaround time. This is a type 1 parameter and + * will be negotiated independently for each station + * + */ +static int irlap_param_max_turn_time(void *instance, irda_param_t *param, + int get) +{ + struct irlap_cb *self = (struct irlap_cb *) instance; + + IRDA_ASSERT(self != NULL, return -1;); + IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); + + if (get) + param->pv.i = self->qos_rx.max_turn_time.bits; + else + self->qos_tx.max_turn_time.bits = (__u8) param->pv.i; + + return 0; +} + +/* + * Function irlap_param_data_size (instance, param, get) + * + * Negotiate the data size. This is a type 1 parameter and + * will be negotiated independently for each station + * + */ +static int irlap_param_data_size(void *instance, irda_param_t *param, int get) +{ + struct irlap_cb *self = (struct irlap_cb *) instance; + + IRDA_ASSERT(self != NULL, return -1;); + IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); + + if (get) + param->pv.i = self->qos_rx.data_size.bits; + else + self->qos_tx.data_size.bits = (__u8) param->pv.i; + + return 0; +} + +/* + * Function irlap_param_window_size (instance, param, get) + * + * Negotiate the window size. This is a type 1 parameter and + * will be negotiated independently for each station + * + */ +static int irlap_param_window_size(void *instance, irda_param_t *param, + int get) +{ + struct irlap_cb *self = (struct irlap_cb *) instance; + + IRDA_ASSERT(self != NULL, return -1;); + IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); + + if (get) + param->pv.i = self->qos_rx.window_size.bits; + else + self->qos_tx.window_size.bits = (__u8) param->pv.i; + + return 0; +} + +/* + * Function irlap_param_additional_bofs (instance, param, get) + * + * Negotiate additional BOF characters. This is a type 1 parameter and + * will be negotiated independently for each station. + */ +static int irlap_param_additional_bofs(void *instance, irda_param_t *param, int get) +{ + struct irlap_cb *self = (struct irlap_cb *) instance; + + IRDA_ASSERT(self != NULL, return -1;); + IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); + + if (get) + param->pv.i = self->qos_rx.additional_bofs.bits; + else + self->qos_tx.additional_bofs.bits = (__u8) param->pv.i; + + return 0; +} + +/* + * Function irlap_param_min_turn_time (instance, param, get) + * + * Negotiate the minimum turn around time. This is a type 1 parameter and + * will be negotiated independently for each station + */ +static int irlap_param_min_turn_time(void *instance, irda_param_t *param, + int get) +{ + struct irlap_cb *self = (struct irlap_cb *) instance; + + IRDA_ASSERT(self != NULL, return -1;); + IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); + + if (get) + param->pv.i = self->qos_rx.min_turn_time.bits; + else + self->qos_tx.min_turn_time.bits = (__u8) param->pv.i; + + return 0; +} + +/* + * Function irlap_max_line_capacity (speed, max_turn_time, min_turn_time) + * + * Calculate the maximum line capacity + * + */ +__u32 irlap_max_line_capacity(__u32 speed, __u32 max_turn_time) +{ + __u32 line_capacity; + int i,j; + + IRDA_DEBUG(2, "%s(), speed=%d, max_turn_time=%d\n", + __FUNCTION__, speed, max_turn_time); + + i = value_index(speed, baud_rates, 10); + j = value_index(max_turn_time, max_turn_times, 4); + + IRDA_ASSERT(((i >=0) && (i <10)), return 0;); + IRDA_ASSERT(((j >=0) && (j <4)), return 0;); + + line_capacity = max_line_capacities[i][j]; + + IRDA_DEBUG(2, "%s(), line capacity=%d bytes\n", + __FUNCTION__, line_capacity); + + return line_capacity; +} + +#ifndef CONFIG_IRDA_DYNAMIC_WINDOW +static __u32 irlap_requested_line_capacity(struct qos_info *qos) +{ + __u32 line_capacity; + + line_capacity = qos->window_size.value * + (qos->data_size.value + 6 + qos->additional_bofs.value) + + irlap_min_turn_time_in_bytes(qos->baud_rate.value, + qos->min_turn_time.value); + + IRDA_DEBUG(2, "%s(), requested line capacity=%d\n", + __FUNCTION__, line_capacity); + + return line_capacity; +} +#endif + +void irda_qos_bits_to_value(struct qos_info *qos) +{ + int index; + + IRDA_ASSERT(qos != NULL, return;); + + index = msb_index(qos->baud_rate.bits); + qos->baud_rate.value = baud_rates[index]; + + index = msb_index(qos->data_size.bits); + qos->data_size.value = data_sizes[index]; + + index = msb_index(qos->window_size.bits); + qos->window_size.value = index+1; + + index = msb_index(qos->min_turn_time.bits); + qos->min_turn_time.value = min_turn_times[index]; + + index = msb_index(qos->max_turn_time.bits); + qos->max_turn_time.value = max_turn_times[index]; + + index = msb_index(qos->link_disc_time.bits); + qos->link_disc_time.value = link_disc_times[index]; + + index = msb_index(qos->additional_bofs.bits); + qos->additional_bofs.value = add_bofs[index]; +} +EXPORT_SYMBOL(irda_qos_bits_to_value); |
