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![Nicholas Mc Guire](/assets/img/avatar_default.png)
This is only an API consolidation and should make things more readable it replaces var * HZ / 1000 constructs by msecs_to_jiffies(var). Signed-off-by: Nicholas Mc Guire <der.herr@hofr.at> Signed-off-by: David S. Miller <davem@davemloft.net>
1207 lines
33 KiB
C
1207 lines
33 KiB
C
/*********************************************************************
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*
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* Filename: irlap.c
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* Version: 1.0
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* Description: IrLAP implementation for Linux
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* Status: Stable
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* Author: Dag Brattli <dagb@cs.uit.no>
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* Created at: Mon Aug 4 20:40:53 1997
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* Modified at: Tue Dec 14 09:26:44 1999
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* Modified by: Dag Brattli <dagb@cs.uit.no>
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*
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* Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved.
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* Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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********************************************************************/
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/skbuff.h>
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#include <linux/delay.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/random.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <net/irda/irda.h>
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#include <net/irda/irda_device.h>
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#include <net/irda/irqueue.h>
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#include <net/irda/irlmp.h>
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#include <net/irda/irlmp_frame.h>
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#include <net/irda/irlap_frame.h>
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#include <net/irda/irlap.h>
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#include <net/irda/timer.h>
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#include <net/irda/qos.h>
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static hashbin_t *irlap = NULL;
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int sysctl_slot_timeout = SLOT_TIMEOUT * 1000 / HZ;
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/* This is the delay of missed pf period before generating an event
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* to the application. The spec mandate 3 seconds, but in some cases
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* it's way too long. - Jean II */
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int sysctl_warn_noreply_time = 3;
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extern void irlap_queue_xmit(struct irlap_cb *self, struct sk_buff *skb);
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static void __irlap_close(struct irlap_cb *self);
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static void irlap_init_qos_capabilities(struct irlap_cb *self,
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struct qos_info *qos_user);
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static const char *const lap_reasons[] __maybe_unused = {
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"ERROR, NOT USED",
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"LAP_DISC_INDICATION",
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"LAP_NO_RESPONSE",
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"LAP_RESET_INDICATION",
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"LAP_FOUND_NONE",
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"LAP_MEDIA_BUSY",
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"LAP_PRIMARY_CONFLICT",
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"ERROR, NOT USED",
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};
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int __init irlap_init(void)
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{
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/* Check if the compiler did its job properly.
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* May happen on some ARM configuration, check with Russell King. */
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IRDA_ASSERT(sizeof(struct xid_frame) == 14, ;);
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IRDA_ASSERT(sizeof(struct test_frame) == 10, ;);
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IRDA_ASSERT(sizeof(struct ua_frame) == 10, ;);
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IRDA_ASSERT(sizeof(struct snrm_frame) == 11, ;);
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/* Allocate master array */
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irlap = hashbin_new(HB_LOCK);
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if (irlap == NULL) {
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net_err_ratelimited("%s: can't allocate irlap hashbin!\n",
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__func__);
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return -ENOMEM;
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}
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return 0;
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}
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void irlap_cleanup(void)
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{
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IRDA_ASSERT(irlap != NULL, return;);
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hashbin_delete(irlap, (FREE_FUNC) __irlap_close);
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}
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/*
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* Function irlap_open (driver)
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*
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* Initialize IrLAP layer
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*
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*/
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struct irlap_cb *irlap_open(struct net_device *dev, struct qos_info *qos,
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const char *hw_name)
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{
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struct irlap_cb *self;
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/* Initialize the irlap structure. */
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self = kzalloc(sizeof(struct irlap_cb), GFP_KERNEL);
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if (self == NULL)
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return NULL;
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self->magic = LAP_MAGIC;
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/* Make a binding between the layers */
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self->netdev = dev;
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self->qos_dev = qos;
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/* Copy hardware name */
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if(hw_name != NULL) {
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strlcpy(self->hw_name, hw_name, sizeof(self->hw_name));
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} else {
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self->hw_name[0] = '\0';
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}
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/* FIXME: should we get our own field? */
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dev->atalk_ptr = self;
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self->state = LAP_OFFLINE;
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/* Initialize transmit queue */
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skb_queue_head_init(&self->txq);
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skb_queue_head_init(&self->txq_ultra);
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skb_queue_head_init(&self->wx_list);
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/* My unique IrLAP device address! */
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/* We don't want the broadcast address, neither the NULL address
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* (most often used to signify "invalid"), and we don't want an
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* address already in use (otherwise connect won't be able
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* to select the proper link). - Jean II */
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do {
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get_random_bytes(&self->saddr, sizeof(self->saddr));
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} while ((self->saddr == 0x0) || (self->saddr == BROADCAST) ||
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(hashbin_lock_find(irlap, self->saddr, NULL)) );
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/* Copy to the driver */
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memcpy(dev->dev_addr, &self->saddr, 4);
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init_timer(&self->slot_timer);
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init_timer(&self->query_timer);
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init_timer(&self->discovery_timer);
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init_timer(&self->final_timer);
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init_timer(&self->poll_timer);
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init_timer(&self->wd_timer);
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init_timer(&self->backoff_timer);
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init_timer(&self->media_busy_timer);
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irlap_apply_default_connection_parameters(self);
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self->N3 = 3; /* # connections attempts to try before giving up */
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self->state = LAP_NDM;
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hashbin_insert(irlap, (irda_queue_t *) self, self->saddr, NULL);
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irlmp_register_link(self, self->saddr, &self->notify);
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return self;
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}
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EXPORT_SYMBOL(irlap_open);
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/*
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* Function __irlap_close (self)
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*
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* Remove IrLAP and all allocated memory. Stop any pending timers.
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*
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*/
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static void __irlap_close(struct irlap_cb *self)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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/* Stop timers */
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del_timer(&self->slot_timer);
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del_timer(&self->query_timer);
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del_timer(&self->discovery_timer);
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del_timer(&self->final_timer);
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del_timer(&self->poll_timer);
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del_timer(&self->wd_timer);
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del_timer(&self->backoff_timer);
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del_timer(&self->media_busy_timer);
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irlap_flush_all_queues(self);
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self->magic = 0;
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kfree(self);
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}
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/*
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* Function irlap_close (self)
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*
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* Remove IrLAP instance
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*
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*/
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void irlap_close(struct irlap_cb *self)
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{
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struct irlap_cb *lap;
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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/* We used to send a LAP_DISC_INDICATION here, but this was
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* racy. This has been move within irlmp_unregister_link()
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* itself. Jean II */
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/* Kill the LAP and all LSAPs on top of it */
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irlmp_unregister_link(self->saddr);
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self->notify.instance = NULL;
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/* Be sure that we manage to remove ourself from the hash */
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lap = hashbin_remove(irlap, self->saddr, NULL);
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if (!lap) {
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pr_debug("%s(), Didn't find myself!\n", __func__);
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return;
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}
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__irlap_close(lap);
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}
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EXPORT_SYMBOL(irlap_close);
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/*
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* Function irlap_connect_indication (self, skb)
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*
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* Another device is attempting to make a connection
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*
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*/
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void irlap_connect_indication(struct irlap_cb *self, struct sk_buff *skb)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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irlap_init_qos_capabilities(self, NULL); /* No user QoS! */
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irlmp_link_connect_indication(self->notify.instance, self->saddr,
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self->daddr, &self->qos_tx, skb);
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}
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/*
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* Function irlap_connect_response (self, skb)
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*
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* Service user has accepted incoming connection
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*
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*/
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void irlap_connect_response(struct irlap_cb *self, struct sk_buff *userdata)
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{
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irlap_do_event(self, CONNECT_RESPONSE, userdata, NULL);
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}
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/*
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* Function irlap_connect_request (self, daddr, qos_user, sniff)
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*
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* Request connection with another device, sniffing is not implemented
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* yet.
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*
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*/
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void irlap_connect_request(struct irlap_cb *self, __u32 daddr,
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struct qos_info *qos_user, int sniff)
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{
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pr_debug("%s(), daddr=0x%08x\n", __func__, daddr);
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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self->daddr = daddr;
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/*
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* If the service user specifies QoS values for this connection,
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* then use them
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*/
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irlap_init_qos_capabilities(self, qos_user);
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if ((self->state == LAP_NDM) && !self->media_busy)
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irlap_do_event(self, CONNECT_REQUEST, NULL, NULL);
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else
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self->connect_pending = TRUE;
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}
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/*
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* Function irlap_connect_confirm (self, skb)
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*
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* Connection request has been accepted
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*
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*/
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void irlap_connect_confirm(struct irlap_cb *self, struct sk_buff *skb)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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irlmp_link_connect_confirm(self->notify.instance, &self->qos_tx, skb);
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}
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/*
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* Function irlap_data_indication (self, skb)
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*
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* Received data frames from IR-port, so we just pass them up to
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* IrLMP for further processing
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*
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*/
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void irlap_data_indication(struct irlap_cb *self, struct sk_buff *skb,
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int unreliable)
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{
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/* Hide LAP header from IrLMP layer */
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skb_pull(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER);
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irlmp_link_data_indication(self->notify.instance, skb, unreliable);
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}
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/*
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* Function irlap_data_request (self, skb)
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*
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* Queue data for transmission, must wait until XMIT state
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*
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*/
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void irlap_data_request(struct irlap_cb *self, struct sk_buff *skb,
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int unreliable)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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IRDA_ASSERT(skb_headroom(skb) >= (LAP_ADDR_HEADER+LAP_CTRL_HEADER),
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return;);
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skb_push(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER);
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/*
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* Must set frame format now so that the rest of the code knows
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* if its dealing with an I or an UI frame
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*/
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if (unreliable)
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skb->data[1] = UI_FRAME;
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else
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skb->data[1] = I_FRAME;
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/* Don't forget to refcount it - see irlmp_connect_request(). */
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skb_get(skb);
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/* Add at the end of the queue (keep ordering) - Jean II */
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skb_queue_tail(&self->txq, skb);
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/*
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* Send event if this frame only if we are in the right state
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* FIXME: udata should be sent first! (skb_queue_head?)
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*/
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if ((self->state == LAP_XMIT_P) || (self->state == LAP_XMIT_S)) {
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/* If we are not already processing the Tx queue, trigger
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* transmission immediately - Jean II */
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if((skb_queue_len(&self->txq) <= 1) && (!self->local_busy))
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irlap_do_event(self, DATA_REQUEST, skb, NULL);
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/* Otherwise, the packets will be sent normally at the
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* next pf-poll - Jean II */
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}
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}
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/*
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* Function irlap_unitdata_request (self, skb)
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*
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* Send Ultra data. This is data that must be sent outside any connection
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*
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*/
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#ifdef CONFIG_IRDA_ULTRA
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void irlap_unitdata_request(struct irlap_cb *self, struct sk_buff *skb)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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IRDA_ASSERT(skb_headroom(skb) >= (LAP_ADDR_HEADER+LAP_CTRL_HEADER),
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return;);
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skb_push(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER);
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skb->data[0] = CBROADCAST;
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skb->data[1] = UI_FRAME;
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/* Don't need to refcount, see irlmp_connless_data_request() */
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skb_queue_tail(&self->txq_ultra, skb);
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irlap_do_event(self, SEND_UI_FRAME, NULL, NULL);
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}
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#endif /*CONFIG_IRDA_ULTRA */
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/*
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* Function irlap_udata_indication (self, skb)
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*
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* Receive Ultra data. This is data that is received outside any connection
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*
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*/
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#ifdef CONFIG_IRDA_ULTRA
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void irlap_unitdata_indication(struct irlap_cb *self, struct sk_buff *skb)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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IRDA_ASSERT(skb != NULL, return;);
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/* Hide LAP header from IrLMP layer */
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skb_pull(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER);
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irlmp_link_unitdata_indication(self->notify.instance, skb);
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}
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#endif /* CONFIG_IRDA_ULTRA */
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/*
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* Function irlap_disconnect_request (void)
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*
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* Request to disconnect connection by service user
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*/
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void irlap_disconnect_request(struct irlap_cb *self)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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/* Don't disconnect until all data frames are successfully sent */
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if (!skb_queue_empty(&self->txq)) {
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self->disconnect_pending = TRUE;
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return;
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}
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/* Check if we are in the right state for disconnecting */
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switch (self->state) {
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case LAP_XMIT_P: /* FALLTHROUGH */
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case LAP_XMIT_S: /* FALLTHROUGH */
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case LAP_CONN: /* FALLTHROUGH */
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case LAP_RESET_WAIT: /* FALLTHROUGH */
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case LAP_RESET_CHECK:
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irlap_do_event(self, DISCONNECT_REQUEST, NULL, NULL);
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break;
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default:
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pr_debug("%s(), disconnect pending!\n", __func__);
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self->disconnect_pending = TRUE;
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break;
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}
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}
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/*
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* Function irlap_disconnect_indication (void)
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*
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* Disconnect request from other device
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*
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*/
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void irlap_disconnect_indication(struct irlap_cb *self, LAP_REASON reason)
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{
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pr_debug("%s(), reason=%s\n", __func__, lap_reasons[reason]);
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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/* Flush queues */
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irlap_flush_all_queues(self);
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switch (reason) {
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case LAP_RESET_INDICATION:
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pr_debug("%s(), Sending reset request!\n", __func__);
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irlap_do_event(self, RESET_REQUEST, NULL, NULL);
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break;
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case LAP_NO_RESPONSE: /* FALLTHROUGH */
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case LAP_DISC_INDICATION: /* FALLTHROUGH */
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case LAP_FOUND_NONE: /* FALLTHROUGH */
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case LAP_MEDIA_BUSY:
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irlmp_link_disconnect_indication(self->notify.instance, self,
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reason, NULL);
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break;
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default:
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net_err_ratelimited("%s: Unknown reason %d\n",
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__func__, reason);
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}
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}
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|
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/*
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* Function irlap_discovery_request (gen_addr_bit)
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*
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* Start one single discovery operation.
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*
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*/
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void irlap_discovery_request(struct irlap_cb *self, discovery_t *discovery)
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{
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struct irlap_info info;
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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IRDA_ASSERT(discovery != NULL, return;);
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pr_debug("%s(), nslots = %d\n", __func__, discovery->nslots);
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IRDA_ASSERT((discovery->nslots == 1) || (discovery->nslots == 6) ||
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(discovery->nslots == 8) || (discovery->nslots == 16),
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return;);
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/* Discovery is only possible in NDM mode */
|
|
if (self->state != LAP_NDM) {
|
|
pr_debug("%s(), discovery only possible in NDM mode\n",
|
|
__func__);
|
|
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) {
|
|
net_warn_ratelimited("%s(), Unable to allocate discovery log!\n",
|
|
__func__);
|
|
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 = msecs_to_jiffies(sysctl_slot_timeout);
|
|
|
|
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_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:
|
|
net_info_ratelimited("IrLAP, no activity on link!\n");
|
|
break;
|
|
case STATUS_NOISY:
|
|
net_info_ratelimited("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_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)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
pr_debug("%s(), expected!\n", __func__);
|
|
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_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;
|
|
|
|
pr_debug("%s(), setting speed to %d\n", __func__, 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 = alloc_skb(0, GFP_ATOMIC);
|
|
if (skb)
|
|
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) {
|
|
pr_debug("%s(), Found user specified QoS!\n", __func__);
|
|
|
|
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_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;
|
|
}
|
|
|
|
/*
|
|
* Function irlap_apply_connection_parameters (qos, now)
|
|
*
|
|
* Initialize IrLAP with the negotiated QoS values
|
|
*
|
|
* If 'now' is false, the speed and xbofs will be changed after the next
|
|
* frame is sent.
|
|
* If 'now' is true, the speed and xbofs is changed immediately
|
|
*/
|
|
void irlap_apply_connection_parameters(struct irlap_cb *self, int now)
|
|
{
|
|
IRDA_ASSERT(self != NULL, return;);
|
|
IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
|
|
|
|
/* Set the negotiated xbofs value */
|
|
self->next_bofs = self->qos_tx.additional_bofs.value;
|
|
if (now)
|
|
self->bofs_count = self->next_bofs;
|
|
|
|
/* Set the negotiated link speed (may need the new xbofs value) */
|
|
irlap_change_speed(self, self->qos_tx.baud_rate.value, now);
|
|
|
|
self->window_size = self->qos_tx.window_size.value;
|
|
self->window = self->qos_tx.window_size.value;
|
|
|
|
#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
|
|
/*
|
|
* Calculate how many bytes it is possible to transmit before the
|
|
* link must be turned around
|
|
*/
|
|
self->line_capacity =
|
|
irlap_max_line_capacity(self->qos_tx.baud_rate.value,
|
|
self->qos_tx.max_turn_time.value);
|
|
self->bytes_left = self->line_capacity;
|
|
#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
|
|
|
|
|
|
/*
|
|
* Initialize timeout values, some of the rules are listed on
|
|
* page 92 in IrLAP.
|
|
*/
|
|
IRDA_ASSERT(self->qos_tx.max_turn_time.value != 0, return;);
|
|
IRDA_ASSERT(self->qos_rx.max_turn_time.value != 0, return;);
|
|
/* The poll timeout applies only to the primary station.
|
|
* It defines the maximum time the primary stay in XMIT mode
|
|
* before timeout and turning the link around (sending a RR).
|
|
* Or, this is how much we can keep the pf bit in primary mode.
|
|
* Therefore, it must be lower or equal than our *OWN* max turn around.
|
|
* Jean II */
|
|
self->poll_timeout = msecs_to_jiffies(
|
|
self->qos_tx.max_turn_time.value);
|
|
/* The Final timeout applies only to the primary station.
|
|
* It defines the maximum time the primary wait (mostly in RECV mode)
|
|
* for an answer from the secondary station before polling it again.
|
|
* Therefore, it must be greater or equal than our *PARTNER*
|
|
* max turn around time - Jean II */
|
|
self->final_timeout = msecs_to_jiffies(
|
|
self->qos_rx.max_turn_time.value);
|
|
/* The Watchdog Bit timeout applies only to the secondary station.
|
|
* It defines the maximum time the secondary wait (mostly in RECV mode)
|
|
* for poll from the primary station before getting annoyed.
|
|
* Therefore, it must be greater or equal than our *PARTNER*
|
|
* max turn around time - Jean II */
|
|
self->wd_timeout = self->final_timeout * 2;
|
|
|
|
/*
|
|
* N1 and N2 are maximum retry count for *both* the final timer
|
|
* and the wd timer (with a factor 2) as defined above.
|
|
* After N1 retry of a timer, we give a warning to the user.
|
|
* After N2 retry, we consider the link dead and disconnect it.
|
|
* Jean II
|
|
*/
|
|
|
|
/*
|
|
* Set N1 to 0 if Link Disconnect/Threshold Time = 3 and set it to
|
|
* 3 seconds otherwise. See page 71 in IrLAP for more details.
|
|
* Actually, it's not always 3 seconds, as we allow to set
|
|
* it via sysctl... Max maxtt is 500ms, and N1 need to be multiple
|
|
* of 2, so 1 second is minimum we can allow. - Jean II
|
|
*/
|
|
if (self->qos_tx.link_disc_time.value == sysctl_warn_noreply_time)
|
|
/*
|
|
* If we set N1 to 0, it will trigger immediately, which is
|
|
* not what we want. What we really want is to disable it,
|
|
* Jean II
|
|
*/
|
|
self->N1 = -2; /* Disable - Need to be multiple of 2*/
|
|
else
|
|
self->N1 = sysctl_warn_noreply_time * 1000 /
|
|
self->qos_rx.max_turn_time.value;
|
|
|
|
pr_debug("Setting N1 = %d\n", self->N1);
|
|
|
|
/* Set N2 to match our own disconnect time */
|
|
self->N2 = self->qos_tx.link_disc_time.value * 1000 /
|
|
self->qos_rx.max_turn_time.value;
|
|
pr_debug("Setting N2 = %d\n", self->N2);
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
struct irlap_iter_state {
|
|
int id;
|
|
};
|
|
|
|
static void *irlap_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct irlap_iter_state *iter = seq->private;
|
|
struct irlap_cb *self;
|
|
|
|
/* Protect our access to the tsap list */
|
|
spin_lock_irq(&irlap->hb_spinlock);
|
|
iter->id = 0;
|
|
|
|
for (self = (struct irlap_cb *) hashbin_get_first(irlap);
|
|
self; self = (struct irlap_cb *) hashbin_get_next(irlap)) {
|
|
if (iter->id == *pos)
|
|
break;
|
|
++iter->id;
|
|
}
|
|
|
|
return self;
|
|
}
|
|
|
|
static void *irlap_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct irlap_iter_state *iter = seq->private;
|
|
|
|
++*pos;
|
|
++iter->id;
|
|
return (void *) hashbin_get_next(irlap);
|
|
}
|
|
|
|
static void irlap_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
spin_unlock_irq(&irlap->hb_spinlock);
|
|
}
|
|
|
|
static int irlap_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
const struct irlap_iter_state *iter = seq->private;
|
|
const struct irlap_cb *self = v;
|
|
|
|
IRDA_ASSERT(self->magic == LAP_MAGIC, return -EINVAL;);
|
|
|
|
seq_printf(seq, "irlap%d ", iter->id);
|
|
seq_printf(seq, "state: %s\n",
|
|
irlap_state[self->state]);
|
|
|
|
seq_printf(seq, " device name: %s, ",
|
|
(self->netdev) ? self->netdev->name : "bug");
|
|
seq_printf(seq, "hardware name: %s\n", self->hw_name);
|
|
|
|
seq_printf(seq, " caddr: %#02x, ", self->caddr);
|
|
seq_printf(seq, "saddr: %#08x, ", self->saddr);
|
|
seq_printf(seq, "daddr: %#08x\n", self->daddr);
|
|
|
|
seq_printf(seq, " win size: %d, ",
|
|
self->window_size);
|
|
seq_printf(seq, "win: %d, ", self->window);
|
|
#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
|
|
seq_printf(seq, "line capacity: %d, ",
|
|
self->line_capacity);
|
|
seq_printf(seq, "bytes left: %d\n", self->bytes_left);
|
|
#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
|
|
seq_printf(seq, " tx queue len: %d ",
|
|
skb_queue_len(&self->txq));
|
|
seq_printf(seq, "win queue len: %d ",
|
|
skb_queue_len(&self->wx_list));
|
|
seq_printf(seq, "rbusy: %s", self->remote_busy ?
|
|
"TRUE" : "FALSE");
|
|
seq_printf(seq, " mbusy: %s\n", self->media_busy ?
|
|
"TRUE" : "FALSE");
|
|
|
|
seq_printf(seq, " retrans: %d ", self->retry_count);
|
|
seq_printf(seq, "vs: %d ", self->vs);
|
|
seq_printf(seq, "vr: %d ", self->vr);
|
|
seq_printf(seq, "va: %d\n", self->va);
|
|
|
|
seq_printf(seq, " qos\tbps\tmaxtt\tdsize\twinsize\taddbofs\tmintt\tldisc\tcomp\n");
|
|
|
|
seq_printf(seq, " tx\t%d\t",
|
|
self->qos_tx.baud_rate.value);
|
|
seq_printf(seq, "%d\t",
|
|
self->qos_tx.max_turn_time.value);
|
|
seq_printf(seq, "%d\t",
|
|
self->qos_tx.data_size.value);
|
|
seq_printf(seq, "%d\t",
|
|
self->qos_tx.window_size.value);
|
|
seq_printf(seq, "%d\t",
|
|
self->qos_tx.additional_bofs.value);
|
|
seq_printf(seq, "%d\t",
|
|
self->qos_tx.min_turn_time.value);
|
|
seq_printf(seq, "%d\t",
|
|
self->qos_tx.link_disc_time.value);
|
|
seq_printf(seq, "\n");
|
|
|
|
seq_printf(seq, " rx\t%d\t",
|
|
self->qos_rx.baud_rate.value);
|
|
seq_printf(seq, "%d\t",
|
|
self->qos_rx.max_turn_time.value);
|
|
seq_printf(seq, "%d\t",
|
|
self->qos_rx.data_size.value);
|
|
seq_printf(seq, "%d\t",
|
|
self->qos_rx.window_size.value);
|
|
seq_printf(seq, "%d\t",
|
|
self->qos_rx.additional_bofs.value);
|
|
seq_printf(seq, "%d\t",
|
|
self->qos_rx.min_turn_time.value);
|
|
seq_printf(seq, "%d\n",
|
|
self->qos_rx.link_disc_time.value);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations irlap_seq_ops = {
|
|
.start = irlap_seq_start,
|
|
.next = irlap_seq_next,
|
|
.stop = irlap_seq_stop,
|
|
.show = irlap_seq_show,
|
|
};
|
|
|
|
static int irlap_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
if (irlap == NULL)
|
|
return -EINVAL;
|
|
|
|
return seq_open_private(file, &irlap_seq_ops,
|
|
sizeof(struct irlap_iter_state));
|
|
}
|
|
|
|
const struct file_operations irlap_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = irlap_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_private,
|
|
};
|
|
|
|
#endif /* CONFIG_PROC_FS */
|