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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/irda/irlap.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/irda/irlap.c')
-rw-r--r--net/irda/irlap.c1258
1 files changed, 1258 insertions, 0 deletions
diff --git a/net/irda/irlap.c b/net/irda/irlap.c
new file mode 100644
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+++ b/net/irda/irlap.c
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+/*********************************************************************
+ *
+ * Filename: irlap.c
+ * Version: 1.0
+ * Description: IrLAP implementation for Linux
+ * Status: Stable
+ * Author: Dag Brattli <dagb@cs.uit.no>
+ * Created at: Mon Aug 4 20:40:53 1997
+ * Modified at: Tue Dec 14 09:26:44 1999
+ * Modified by: Dag Brattli <dagb@cs.uit.no>
+ *
+ * Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved.
+ * Copyright (c) 2000-2003 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 <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_len(&self->txq) > 0) {
+ 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;
+}
+
+/*
+ * 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_DEBUG(4, "%s()\n", __FUNCTION__);
+
+ 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 = self->qos_tx.max_turn_time.value * HZ / 1000;
+ /* 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 = self->qos_rx.max_turn_time.value * HZ / 1000;
+ /* 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;
+
+ IRDA_DEBUG(4, "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;
+ IRDA_DEBUG(4, "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 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)
+{
+ struct seq_file *seq;
+ int rc = -ENOMEM;
+ struct irlap_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
+
+ if (!s)
+ goto out;
+
+ if (irlap == NULL) {
+ rc = -EINVAL;
+ goto out_kfree;
+ }
+
+ rc = seq_open(file, &irlap_seq_ops);
+ if (rc)
+ goto out_kfree;
+
+ seq = file->private_data;
+ seq->private = s;
+ memset(s, 0, sizeof(*s));
+out:
+ return rc;
+out_kfree:
+ kfree(s);
+ goto out;
+}
+
+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 */