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irlap.c
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irlap.c
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/*********************************************************************
*
* Filename: irlap.c
* Version: 1.0
* Description: IrLAP implementation for Linux
* Status: Stable
* Author: Dag Brattli <[email protected]>
* Created at: Mon Aug 4 20:40:53 1997
* Modified at: Tue Dec 14 09:26:44 1999
* Modified by: Dag Brattli <[email protected]>
*
* Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved.
* Copyright (c) 2000-2003 Jean Tourrilhes <[email protected]>
*
* 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 <linux/slab.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/random.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <net/irda/irda.h>
#include <net/irda/irda_device.h>
#include <net/irda/irqueue.h>
#include <net/irda/irlmp.h>
#include <net/irda/irlmp_frame.h>
#include <net/irda/irlap_frame.h>
#include <net/irda/irlap.h>
#include <net/irda/timer.h>
#include <net/irda/qos.h>
static hashbin_t *irlap = NULL;
int sysctl_slot_timeout = SLOT_TIMEOUT * 1000 / HZ;
/* This is the delay of missed pf period before generating an event
* to the application. The spec mandate 3 seconds, but in some cases
* it's way too long. - Jean II */
int sysctl_warn_noreply_time = 3;
extern void irlap_queue_xmit(struct irlap_cb *self, struct sk_buff *skb);
static void __irlap_close(struct irlap_cb *self);
static void irlap_init_qos_capabilities(struct irlap_cb *self,
struct qos_info *qos_user);
#ifdef CONFIG_IRDA_DEBUG
static char *lap_reasons[] = {
"ERROR, NOT USED",
"LAP_DISC_INDICATION",
"LAP_NO_RESPONSE",
"LAP_RESET_INDICATION",
"LAP_FOUND_NONE",
"LAP_MEDIA_BUSY",
"LAP_PRIMARY_CONFLICT",
"ERROR, NOT USED",
};
#endif /* CONFIG_IRDA_DEBUG */
int __init irlap_init(void)
{
/* Check if the compiler did its job properly.
* May happen on some ARM configuration, check with Russell King. */
IRDA_ASSERT(sizeof(struct xid_frame) == 14, ;);
IRDA_ASSERT(sizeof(struct test_frame) == 10, ;);
IRDA_ASSERT(sizeof(struct ua_frame) == 10, ;);
IRDA_ASSERT(sizeof(struct snrm_frame) == 11, ;);
/* Allocate master array */
irlap = hashbin_new(HB_LOCK);
if (irlap == NULL) {
IRDA_ERROR("%s: can't allocate irlap hashbin!\n",
__FUNCTION__);
return -ENOMEM;
}
return 0;
}
void __exit irlap_cleanup(void)
{
IRDA_ASSERT(irlap != NULL, return;);
hashbin_delete(irlap, (FREE_FUNC) __irlap_close);
}
/*
* Function irlap_open (driver)
*
* Initialize IrLAP layer
*
*/
struct irlap_cb *irlap_open(struct net_device *dev, struct qos_info *qos,
const char *hw_name)
{
struct irlap_cb *self;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
/* Initialize the irlap structure. */
self = kmalloc(sizeof(struct irlap_cb), GFP_KERNEL);
if (self == NULL)
return NULL;
memset(self, 0, sizeof(struct irlap_cb));
self->magic = LAP_MAGIC;
/* Make a binding between the layers */
self->netdev = dev;
self->qos_dev = qos;
/* Copy hardware name */
if(hw_name != NULL) {
strlcpy(self->hw_name, hw_name, sizeof(self->hw_name));
} else {
self->hw_name[0] = '\0';
}
/* FIXME: should we get our own field? */
dev->atalk_ptr = self;
self->state = LAP_OFFLINE;
/* Initialize transmit queue */
skb_queue_head_init(&self->txq);
skb_queue_head_init(&self->txq_ultra);
skb_queue_head_init(&self->wx_list);
/* My unique IrLAP device address! */
/* We don't want the broadcast address, neither the NULL address
* (most often used to signify "invalid"), and we don't want an
* address already in use (otherwise connect won't be able
* to select the proper link). - Jean II */
do {
get_random_bytes(&self->saddr, sizeof(self->saddr));
} while ((self->saddr == 0x0) || (self->saddr == BROADCAST) ||
(hashbin_lock_find(irlap, self->saddr, NULL)) );
/* Copy to the driver */
memcpy(dev->dev_addr, &self->saddr, 4);
init_timer(&self->slot_timer);
init_timer(&self->query_timer);
init_timer(&self->discovery_timer);
init_timer(&self->final_timer);
init_timer(&self->poll_timer);
init_timer(&self->wd_timer);
init_timer(&self->backoff_timer);
init_timer(&self->media_busy_timer);
irlap_apply_default_connection_parameters(self);
self->N3 = 3; /* # connections attemts to try before giving up */
self->state = LAP_NDM;
hashbin_insert(irlap, (irda_queue_t *) self, self->saddr, NULL);
irlmp_register_link(self, self->saddr, &self->notify);
return self;
}
EXPORT_SYMBOL(irlap_open);
/*
* Function __irlap_close (self)
*
* Remove IrLAP and all allocated memory. Stop any pending timers.
*
*/
static void __irlap_close(struct irlap_cb *self)
{
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
/* Stop timers */
del_timer(&self->slot_timer);
del_timer(&self->query_timer);
del_timer(&self->discovery_timer);
del_timer(&self->final_timer);
del_timer(&self->poll_timer);
del_timer(&self->wd_timer);
del_timer(&self->backoff_timer);
del_timer(&self->media_busy_timer);
irlap_flush_all_queues(self);
self->magic = 0;
kfree(self);
}
/*
* Function irlap_close (self)
*
* Remove IrLAP instance
*
*/
void irlap_close(struct irlap_cb *self)
{
struct irlap_cb *lap;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
/* We used to send a LAP_DISC_INDICATION here, but this was
* racy. This has been move within irlmp_unregister_link()
* itself. Jean II */
/* Kill the LAP and all LSAPs on top of it */
irlmp_unregister_link(self->saddr);
self->notify.instance = NULL;
/* Be sure that we manage to remove ourself from the hash */
lap = hashbin_remove(irlap, self->saddr, NULL);
if (!lap) {
IRDA_DEBUG(1, "%s(), Didn't find myself!\n", __FUNCTION__);
return;
}
__irlap_close(lap);
}
EXPORT_SYMBOL(irlap_close);
/*
* Function irlap_connect_indication (self, skb)
*
* Another device is attempting to make a connection
*
*/
void irlap_connect_indication(struct irlap_cb *self, struct sk_buff *skb)
{
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
irlap_init_qos_capabilities(self, NULL); /* No user QoS! */
irlmp_link_connect_indication(self->notify.instance, self->saddr,
self->daddr, &self->qos_tx, skb);
}
/*
* Function irlap_connect_response (self, skb)
*
* Service user has accepted incoming connection
*
*/
void irlap_connect_response(struct irlap_cb *self, struct sk_buff *userdata)
{
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
irlap_do_event(self, CONNECT_RESPONSE, userdata, NULL);
}
/*
* Function irlap_connect_request (self, daddr, qos_user, sniff)
*
* Request connection with another device, sniffing is not implemented
* yet.
*
*/
void irlap_connect_request(struct irlap_cb *self, __u32 daddr,
struct qos_info *qos_user, int sniff)
{
IRDA_DEBUG(3, "%s(), daddr=0x%08x\n", __FUNCTION__, daddr);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
self->daddr = daddr;
/*
* If the service user specifies QoS values for this connection,
* then use them
*/
irlap_init_qos_capabilities(self, qos_user);
if ((self->state == LAP_NDM) && !self->media_busy)
irlap_do_event(self, CONNECT_REQUEST, NULL, NULL);
else
self->connect_pending = TRUE;
}
/*
* Function irlap_connect_confirm (self, skb)
*
* Connection request has been accepted
*
*/
void irlap_connect_confirm(struct irlap_cb *self, struct sk_buff *skb)
{
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
irlmp_link_connect_confirm(self->notify.instance, &self->qos_tx, skb);
}
/*
* Function irlap_data_indication (self, skb)
*
* Received data frames from IR-port, so we just pass them up to
* IrLMP for further processing
*
*/
void irlap_data_indication(struct irlap_cb *self, struct sk_buff *skb,
int unreliable)
{
/* Hide LAP header from IrLMP layer */
skb_pull(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER);
irlmp_link_data_indication(self->notify.instance, skb, unreliable);
}
/*
* Function irlap_data_request (self, skb)
*
* Queue data for transmission, must wait until XMIT state
*
*/
void irlap_data_request(struct irlap_cb *self, struct sk_buff *skb,
int unreliable)
{
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
IRDA_DEBUG(3, "%s()\n", __FUNCTION__);
IRDA_ASSERT(skb_headroom(skb) >= (LAP_ADDR_HEADER+LAP_CTRL_HEADER),
return;);
skb_push(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER);
/*
* Must set frame format now so that the rest of the code knows
* if its dealing with an I or an UI frame
*/
if (unreliable)
skb->data[1] = UI_FRAME;
else
skb->data[1] = I_FRAME;
/* Don't forget to refcount it - see irlmp_connect_request(). */
skb_get(skb);
/* Add at the end of the queue (keep ordering) - Jean II */
skb_queue_tail(&self->txq, skb);
/*
* Send event if this frame only if we are in the right state
* FIXME: udata should be sent first! (skb_queue_head?)
*/
if ((self->state == LAP_XMIT_P) || (self->state == LAP_XMIT_S)) {
/* If we are not already processing the Tx queue, trigger
* transmission immediately - Jean II */
if((skb_queue_len(&self->txq) <= 1) && (!self->local_busy))
irlap_do_event(self, DATA_REQUEST, skb, NULL);
/* Otherwise, the packets will be sent normally at the
* next pf-poll - Jean II */
}
}
/*
* Function irlap_unitdata_request (self, skb)
*
* Send Ultra data. This is data that must be sent outside any connection
*
*/
#ifdef CONFIG_IRDA_ULTRA
void irlap_unitdata_request(struct irlap_cb *self, struct sk_buff *skb)
{
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
IRDA_DEBUG(3, "%s()\n", __FUNCTION__);
IRDA_ASSERT(skb_headroom(skb) >= (LAP_ADDR_HEADER+LAP_CTRL_HEADER),
return;);
skb_push(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER);
skb->data[0] = CBROADCAST;
skb->data[1] = UI_FRAME;
/* Don't need to refcount, see irlmp_connless_data_request() */
skb_queue_tail(&self->txq_ultra, skb);
irlap_do_event(self, SEND_UI_FRAME, NULL, NULL);
}
#endif /*CONFIG_IRDA_ULTRA */
/*
* Function irlap_udata_indication (self, skb)
*
* Receive Ultra data. This is data that is received outside any connection
*
*/
#ifdef CONFIG_IRDA_ULTRA
void irlap_unitdata_indication(struct irlap_cb *self, struct sk_buff *skb)
{
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
IRDA_ASSERT(skb != NULL, return;);
/* Hide LAP header from IrLMP layer */
skb_pull(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER);
irlmp_link_unitdata_indication(self->notify.instance, skb);
}
#endif /* CONFIG_IRDA_ULTRA */
/*
* Function irlap_disconnect_request (void)
*
* Request to disconnect connection by service user
*/
void irlap_disconnect_request(struct irlap_cb *self)
{
IRDA_DEBUG(3, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
/* Don't disconnect until all data frames are successfully sent */
if (!skb_queue_empty(&self->txq)) {
self->disconnect_pending = TRUE;
return;
}
/* Check if we are in the right state for disconnecting */
switch (self->state) {
case LAP_XMIT_P: /* FALLTROUGH */
case LAP_XMIT_S: /* FALLTROUGH */
case LAP_CONN: /* FALLTROUGH */
case LAP_RESET_WAIT: /* FALLTROUGH */
case LAP_RESET_CHECK:
irlap_do_event(self, DISCONNECT_REQUEST, NULL, NULL);
break;
default:
IRDA_DEBUG(2, "%s(), disconnect pending!\n", __FUNCTION__);
self->disconnect_pending = TRUE;
break;
}
}
/*
* Function irlap_disconnect_indication (void)
*
* Disconnect request from other device
*
*/
void irlap_disconnect_indication(struct irlap_cb *self, LAP_REASON reason)
{
IRDA_DEBUG(1, "%s(), reason=%s\n", __FUNCTION__, lap_reasons[reason]);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
/* Flush queues */
irlap_flush_all_queues(self);
switch (reason) {
case LAP_RESET_INDICATION:
IRDA_DEBUG(1, "%s(), Sending reset request!\n", __FUNCTION__);
irlap_do_event(self, RESET_REQUEST, NULL, NULL);
break;
case LAP_NO_RESPONSE: /* FALLTROUGH */
case LAP_DISC_INDICATION: /* FALLTROUGH */
case LAP_FOUND_NONE: /* FALLTROUGH */
case LAP_MEDIA_BUSY:
irlmp_link_disconnect_indication(self->notify.instance, self,
reason, NULL);
break;
default:
IRDA_ERROR("%s: Unknown reason %d\n", __FUNCTION__, reason);
}
}
/*
* Function irlap_discovery_request (gen_addr_bit)
*
* Start one single discovery operation.
*
*/
void irlap_discovery_request(struct irlap_cb *self, discovery_t *discovery)
{
struct irlap_info info;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
IRDA_ASSERT(discovery != NULL, return;);
IRDA_DEBUG(4, "%s(), nslots = %d\n", __FUNCTION__, discovery->nslots);
IRDA_ASSERT((discovery->nslots == 1) || (discovery->nslots == 6) ||
(discovery->nslots == 8) || (discovery->nslots == 16),
return;);
/* Discovery is only possible in NDM mode */
if (self->state != LAP_NDM) {
IRDA_DEBUG(4, "%s(), discovery only possible in NDM mode\n",
__FUNCTION__);
irlap_discovery_confirm(self, NULL);
/* Note : in theory, if we are not in NDM, we could postpone
* the discovery like we do for connection request.
* In practice, it's not worth it. If the media was busy,
* it's likely next time around it won't be busy. If we are
* in REPLY state, we will get passive discovery info & event.
* Jean II */
return;
}
/* Check if last discovery request finished in time, or if
* it was aborted due to the media busy flag. */
if (self->discovery_log != NULL) {
hashbin_delete(self->discovery_log, (FREE_FUNC) kfree);
self->discovery_log = NULL;
}
/* All operations will occur at predictable time, no need to lock */
self->discovery_log = hashbin_new(HB_NOLOCK);
if (self->discovery_log == NULL) {
IRDA_WARNING("%s(), Unable to allocate discovery log!\n",
__FUNCTION__);
return;
}
info.S = discovery->nslots; /* Number of slots */
info.s = 0; /* Current slot */
self->discovery_cmd = discovery;
info.discovery = discovery;
/* sysctl_slot_timeout bounds are checked in irsysctl.c - Jean II */
self->slot_timeout = sysctl_slot_timeout * HZ / 1000;
irlap_do_event(self, DISCOVERY_REQUEST, NULL, &info);
}
/*
* Function irlap_discovery_confirm (log)
*
* A device has been discovered in front of this station, we
* report directly to LMP.
*/
void irlap_discovery_confirm(struct irlap_cb *self, hashbin_t *discovery_log)
{
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
IRDA_ASSERT(self->notify.instance != NULL, return;);
/*
* Check for successful discovery, since we are then allowed to clear
* the media busy condition (IrLAP 6.13.4 - p.94). This should allow
* us to make connection attempts much faster and easier (i.e. no
* collisions).
* Setting media busy to false will also generate an event allowing
* to process pending events in NDM state machine.
* Note : the spec doesn't define what's a successful discovery is.
* If we want Ultra to work, it's successful even if there is
* nobody discovered - Jean II
*/
if (discovery_log)
irda_device_set_media_busy(self->netdev, FALSE);
/* Inform IrLMP */
irlmp_link_discovery_confirm(self->notify.instance, discovery_log);
}
/*
* Function irlap_discovery_indication (log)
*
* Somebody is trying to discover us!
*
*/
void irlap_discovery_indication(struct irlap_cb *self, discovery_t *discovery)
{
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
IRDA_ASSERT(discovery != NULL, return;);
IRDA_ASSERT(self->notify.instance != NULL, return;);
/* A device is very likely to connect immediately after it performs
* a successful discovery. This means that in our case, we are much
* more likely to receive a connection request over the medium.
* So, we backoff to avoid collisions.
* IrLAP spec 6.13.4 suggest 100ms...
* Note : this little trick actually make a *BIG* difference. If I set
* my Linux box with discovery enabled and one Ultra frame sent every
* second, my Palm has no trouble connecting to it every time !
* Jean II */
irda_device_set_media_busy(self->netdev, SMALL);
irlmp_link_discovery_indication(self->notify.instance, discovery);
}
/*
* Function irlap_status_indication (quality_of_link)
*/
void irlap_status_indication(struct irlap_cb *self, int quality_of_link)
{
switch (quality_of_link) {
case STATUS_NO_ACTIVITY:
IRDA_MESSAGE("IrLAP, no activity on link!\n");
break;
case STATUS_NOISY:
IRDA_MESSAGE("IrLAP, noisy link!\n");
break;
default:
break;
}
irlmp_status_indication(self->notify.instance,
quality_of_link, LOCK_NO_CHANGE);
}
/*
* Function irlap_reset_indication (void)
*/
void irlap_reset_indication(struct irlap_cb *self)
{
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
if (self->state == LAP_RESET_WAIT)
irlap_do_event(self, RESET_REQUEST, NULL, NULL);
else
irlap_do_event(self, RESET_RESPONSE, NULL, NULL);
}
/*
* Function irlap_reset_confirm (void)
*/
void irlap_reset_confirm(void)
{
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
}
/*
* Function irlap_generate_rand_time_slot (S, s)
*
* Generate a random time slot between s and S-1 where
* S = Number of slots (0 -> S-1)
* s = Current slot
*/
int irlap_generate_rand_time_slot(int S, int s)
{
static int rand;
int slot;
IRDA_ASSERT((S - s) > 0, return 0;);
rand += jiffies;
rand ^= (rand << 12);
rand ^= (rand >> 20);
slot = s + rand % (S-s);
IRDA_ASSERT((slot >= s) || (slot < S), return 0;);
return slot;
}
/*
* Function irlap_update_nr_received (nr)
*
* Remove all acknowledged frames in current window queue. This code is
* not intuitive and you should not try to change it. If you think it
* contains bugs, please mail a patch to the author instead.
*/
void irlap_update_nr_received(struct irlap_cb *self, int nr)
{
struct sk_buff *skb = NULL;
int count = 0;
/*
* Remove all the ack-ed frames from the window queue.
*/
/*
* Optimize for the common case. It is most likely that the receiver
* will acknowledge all the frames we have sent! So in that case we
* delete all frames stored in window.
*/
if (nr == self->vs) {
while ((skb = skb_dequeue(&self->wx_list)) != NULL) {
dev_kfree_skb(skb);
}
/* The last acked frame is the next to send minus one */
self->va = nr - 1;
} else {
/* Remove all acknowledged frames in current window */
while ((skb_peek(&self->wx_list) != NULL) &&
(((self->va+1) % 8) != nr))
{
skb = skb_dequeue(&self->wx_list);
dev_kfree_skb(skb);
self->va = (self->va + 1) % 8;
count++;
}
}
/* Advance window */
self->window = self->window_size - skb_queue_len(&self->wx_list);
}
/*
* Function irlap_validate_ns_received (ns)
*
* Validate the next to send (ns) field from received frame.
*/
int irlap_validate_ns_received(struct irlap_cb *self, int ns)
{
/* ns as expected? */
if (ns == self->vr)
return NS_EXPECTED;
/*
* Stations are allowed to treat invalid NS as unexpected NS
* IrLAP, Recv ... with-invalid-Ns. p. 84
*/
return NS_UNEXPECTED;
/* return NR_INVALID; */
}
/*
* Function irlap_validate_nr_received (nr)
*
* Validate the next to receive (nr) field from received frame.
*
*/
int irlap_validate_nr_received(struct irlap_cb *self, int nr)
{
/* nr as expected? */
if (nr == self->vs) {
IRDA_DEBUG(4, "%s(), expected!\n", __FUNCTION__);
return NR_EXPECTED;
}
/*
* unexpected nr? (but within current window), first we check if the
* ns numbers of the frames in the current window wrap.
*/
if (self->va < self->vs) {
if ((nr >= self->va) && (nr <= self->vs))
return NR_UNEXPECTED;
} else {
if ((nr >= self->va) || (nr <= self->vs))
return NR_UNEXPECTED;
}
/* Invalid nr! */
return NR_INVALID;
}
/*
* Function irlap_initiate_connection_state ()
*
* Initialize the connection state parameters
*
*/
void irlap_initiate_connection_state(struct irlap_cb *self)
{
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
/* Next to send and next to receive */
self->vs = self->vr = 0;
/* Last frame which got acked (0 - 1) % 8 */
self->va = 7;
self->window = 1;
self->remote_busy = FALSE;
self->retry_count = 0;
}
/*
* Function irlap_wait_min_turn_around (self, qos)
*
* Wait negotiated minimum turn around time, this function actually sets
* the number of BOS's that must be sent before the next transmitted
* frame in order to delay for the specified amount of time. This is
* done to avoid using timers, and the forbidden udelay!
*/
void irlap_wait_min_turn_around(struct irlap_cb *self, struct qos_info *qos)
{
__u32 min_turn_time;
__u32 speed;
/* Get QoS values. */
speed = qos->baud_rate.value;
min_turn_time = qos->min_turn_time.value;
/* No need to calculate XBOFs for speeds over 115200 bps */
if (speed > 115200) {
self->mtt_required = min_turn_time;
return;
}
/*
* Send additional BOF's for the next frame for the requested
* min turn time, so now we must calculate how many chars (XBOF's) we
* must send for the requested time period (min turn time)
*/
self->xbofs_delay = irlap_min_turn_time_in_bytes(speed, min_turn_time);
}
/*
* Function irlap_flush_all_queues (void)
*
* Flush all queues
*
*/
void irlap_flush_all_queues(struct irlap_cb *self)
{
struct sk_buff* skb;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
/* Free transmission queue */
while ((skb = skb_dequeue(&self->txq)) != NULL)
dev_kfree_skb(skb);
while ((skb = skb_dequeue(&self->txq_ultra)) != NULL)
dev_kfree_skb(skb);
/* Free sliding window buffered packets */
while ((skb = skb_dequeue(&self->wx_list)) != NULL)
dev_kfree_skb(skb);
}
/*
* Function irlap_setspeed (self, speed)
*
* Change the speed of the IrDA port
*
*/
static void irlap_change_speed(struct irlap_cb *self, __u32 speed, int now)
{
struct sk_buff *skb;
IRDA_DEBUG(0, "%s(), setting speed to %d\n", __FUNCTION__, speed);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
self->speed = speed;
/* Change speed now, or just piggyback speed on frames */
if (now) {
/* Send down empty frame to trigger speed change */
skb = dev_alloc_skb(0);
irlap_queue_xmit(self, skb);
}
}
/*
* Function irlap_init_qos_capabilities (self, qos)
*
* Initialize QoS for this IrLAP session, What we do is to compute the
* intersection of the QoS capabilities for the user, driver and for
* IrLAP itself. Normally, IrLAP will not specify any values, but it can
* be used to restrict certain values.
*/
static void irlap_init_qos_capabilities(struct irlap_cb *self,
struct qos_info *qos_user)
{
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
IRDA_ASSERT(self->netdev != NULL, return;);
/* Start out with the maximum QoS support possible */
irda_init_max_qos_capabilies(&self->qos_rx);
/* Apply drivers QoS capabilities */
irda_qos_compute_intersection(&self->qos_rx, self->qos_dev);
/*
* Check for user supplied QoS parameters. The service user is only
* allowed to supply these values. We check each parameter since the
* user may not have set all of them.
*/
if (qos_user) {
IRDA_DEBUG(1, "%s(), Found user specified QoS!\n", __FUNCTION__);
if (qos_user->baud_rate.bits)
self->qos_rx.baud_rate.bits &= qos_user->baud_rate.bits;
if (qos_user->max_turn_time.bits)
self->qos_rx.max_turn_time.bits &= qos_user->max_turn_time.bits;
if (qos_user->data_size.bits)
self->qos_rx.data_size.bits &= qos_user->data_size.bits;
if (qos_user->link_disc_time.bits)
self->qos_rx.link_disc_time.bits &= qos_user->link_disc_time.bits;
}
/* Use 500ms in IrLAP for now */
self->qos_rx.max_turn_time.bits &= 0x01;
/* Set data size */
/*self->qos_rx.data_size.bits &= 0x03;*/
irda_qos_bits_to_value(&self->qos_rx);
}
/*
* Function irlap_apply_default_connection_parameters (void, now)
*
* Use the default connection and transmission parameters
*/
void irlap_apply_default_connection_parameters(struct irlap_cb *self)
{
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
/* xbofs : Default value in NDM */
self->next_bofs = 12;
self->bofs_count = 12;
/* NDM Speed is 9600 */
irlap_change_speed(self, 9600, TRUE);
/* Set mbusy when going to NDM state */
irda_device_set_media_busy(self->netdev, TRUE);
/*
* Generate random connection address for this session, which must
* be 7 bits wide and different from 0x00 and 0xfe
*/
while ((self->caddr == 0x00) || (self->caddr == 0xfe)) {
get_random_bytes(&self->caddr, sizeof(self->caddr));
self->caddr &= 0xfe;
}
/* Use default values until connection has been negitiated */
self->slot_timeout = sysctl_slot_timeout;
self->final_timeout = FINAL_TIMEOUT;
self->poll_timeout = POLL_TIMEOUT;
self->wd_timeout = WD_TIMEOUT;
/* Set some default values */
self->qos_tx.baud_rate.value = 9600;
self->qos_rx.baud_rate.value = 9600;
self->qos_tx.max_turn_time.value = 0;
self->qos_rx.max_turn_time.value = 0;
self->qos_tx.min_turn_time.value = 0;
self->qos_rx.min_turn_time.value = 0;
self->qos_tx.data_size.value = 64;
self->qos_rx.data_size.value = 64;
self->qos_tx.window_size.value = 1;
self->qos_rx.window_size.value = 1;
self->qos_tx.additional_bofs.value = 12;
self->qos_rx.additional_bofs.value = 12;
self->qos_tx.link_disc_time.value = 0;
self->qos_rx.link_disc_time.value = 0;
irlap_flush_all_queues(self);
self->disconnect_pending = FALSE;
self->connect_pending = FALSE;
}
/*