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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, 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);
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-11-24 01:32:45 +0000