+++ /dev/null
-/*********************************************************************
- *
- * Filename: irlap_event.c
- * Version: 0.9
- * Description: IrLAP state machine implementation
- * Status: Experimental.
- * Author: Dag Brattli <dag@brattli.net>
- * Created at: Sat Aug 16 00:59:29 1997
- * Modified at: Sat Dec 25 21:07:57 1999
- * Modified by: Dag Brattli <dag@brattli.net>
- *
- * Copyright (c) 1998-2000 Dag Brattli <dag@brattli.net>,
- * Copyright (c) 1998 Thomas Davis <ratbert@radiks.net>
- * 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.
- *
- * Neither Dag Brattli nor University of Tromsø admit liability nor
- * provide warranty for any of this software. This material is
- * provided "AS-IS" and at no charge.
- *
- ********************************************************************/
-
-#include <linux/string.h>
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/skbuff.h>
-#include <linux/slab.h>
-
-#include <net/irda/irda.h>
-#include <net/irda/irlap_event.h>
-
-#include <net/irda/timer.h>
-#include <net/irda/irlap.h>
-#include <net/irda/irlap_frame.h>
-#include <net/irda/qos.h>
-#include <net/irda/parameters.h>
-#include <net/irda/irlmp.h> /* irlmp_flow_indication(), ... */
-
-#include <net/irda/irda_device.h>
-
-#ifdef CONFIG_IRDA_FAST_RR
-int sysctl_fast_poll_increase = 50;
-#endif
-
-static int irlap_state_ndm (struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_query (struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_reply (struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_conn (struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_setup (struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_offline(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_xmit_p (struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_pclose (struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_nrm_p (struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_reset_wait(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_reset (struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_nrm_s (struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_xmit_s (struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_sclose (struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info);
-static int irlap_state_reset_check(struct irlap_cb *, IRLAP_EVENT event,
- struct sk_buff *, struct irlap_info *);
-
-static const char *const irlap_event[] __maybe_unused = {
- "DISCOVERY_REQUEST",
- "CONNECT_REQUEST",
- "CONNECT_RESPONSE",
- "DISCONNECT_REQUEST",
- "DATA_REQUEST",
- "RESET_REQUEST",
- "RESET_RESPONSE",
- "SEND_I_CMD",
- "SEND_UI_FRAME",
- "RECV_DISCOVERY_XID_CMD",
- "RECV_DISCOVERY_XID_RSP",
- "RECV_SNRM_CMD",
- "RECV_TEST_CMD",
- "RECV_TEST_RSP",
- "RECV_UA_RSP",
- "RECV_DM_RSP",
- "RECV_RD_RSP",
- "RECV_I_CMD",
- "RECV_I_RSP",
- "RECV_UI_FRAME",
- "RECV_FRMR_RSP",
- "RECV_RR_CMD",
- "RECV_RR_RSP",
- "RECV_RNR_CMD",
- "RECV_RNR_RSP",
- "RECV_REJ_CMD",
- "RECV_REJ_RSP",
- "RECV_SREJ_CMD",
- "RECV_SREJ_RSP",
- "RECV_DISC_CMD",
- "SLOT_TIMER_EXPIRED",
- "QUERY_TIMER_EXPIRED",
- "FINAL_TIMER_EXPIRED",
- "POLL_TIMER_EXPIRED",
- "DISCOVERY_TIMER_EXPIRED",
- "WD_TIMER_EXPIRED",
- "BACKOFF_TIMER_EXPIRED",
- "MEDIA_BUSY_TIMER_EXPIRED",
-};
-
-const char *const irlap_state[] = {
- "LAP_NDM",
- "LAP_QUERY",
- "LAP_REPLY",
- "LAP_CONN",
- "LAP_SETUP",
- "LAP_OFFLINE",
- "LAP_XMIT_P",
- "LAP_PCLOSE",
- "LAP_NRM_P",
- "LAP_RESET_WAIT",
- "LAP_RESET",
- "LAP_NRM_S",
- "LAP_XMIT_S",
- "LAP_SCLOSE",
- "LAP_RESET_CHECK",
-};
-
-static int (*state[])(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info) =
-{
- irlap_state_ndm,
- irlap_state_query,
- irlap_state_reply,
- irlap_state_conn,
- irlap_state_setup,
- irlap_state_offline,
- irlap_state_xmit_p,
- irlap_state_pclose,
- irlap_state_nrm_p,
- irlap_state_reset_wait,
- irlap_state_reset,
- irlap_state_nrm_s,
- irlap_state_xmit_s,
- irlap_state_sclose,
- irlap_state_reset_check,
-};
-
-/*
- * Function irda_poll_timer_expired (data)
- *
- * Poll timer has expired. Normally we must now send a RR frame to the
- * remote device
- */
-static void irlap_poll_timer_expired(void *data)
-{
- struct irlap_cb *self = (struct irlap_cb *) data;
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
-
- irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL);
-}
-
-/*
- * Calculate and set time before we will have to send back the pf bit
- * to the peer. Use in primary.
- * Make sure that state is XMIT_P/XMIT_S when calling this function
- * (and that nobody messed up with the state). - Jean II
- */
-static void irlap_start_poll_timer(struct irlap_cb *self, int timeout)
-{
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
-
-#ifdef CONFIG_IRDA_FAST_RR
- /*
- * Send out the RR frames faster if our own transmit queue is empty, or
- * if the peer is busy. The effect is a much faster conversation
- */
- if (skb_queue_empty(&self->txq) || self->remote_busy) {
- if (self->fast_RR == TRUE) {
- /*
- * Assert that the fast poll timer has not reached the
- * normal poll timer yet
- */
- if (self->fast_RR_timeout < timeout) {
- /*
- * FIXME: this should be a more configurable
- * function
- */
- self->fast_RR_timeout +=
- (sysctl_fast_poll_increase * HZ/1000);
-
- /* Use this fast(er) timeout instead */
- timeout = self->fast_RR_timeout;
- }
- } else {
- self->fast_RR = TRUE;
-
- /* Start with just 0 ms */
- self->fast_RR_timeout = 0;
- timeout = 0;
- }
- } else
- self->fast_RR = FALSE;
-
- pr_debug("%s(), timeout=%d (%ld)\n", __func__, timeout, jiffies);
-#endif /* CONFIG_IRDA_FAST_RR */
-
- if (timeout == 0)
- irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL);
- else
- irda_start_timer(&self->poll_timer, timeout, self,
- irlap_poll_timer_expired);
-}
-
-/*
- * Function irlap_do_event (event, skb, info)
- *
- * Rushes through the state machine without any delay. If state == XMIT
- * then send queued data frames.
- */
-void irlap_do_event(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- int ret;
-
- if (!self || self->magic != LAP_MAGIC)
- return;
-
- pr_debug("%s(), event = %s, state = %s\n", __func__,
- irlap_event[event], irlap_state[self->state]);
-
- ret = (*state[self->state])(self, event, skb, info);
-
- /*
- * Check if there are any pending events that needs to be executed
- */
- switch (self->state) {
- case LAP_XMIT_P: /* FALLTHROUGH */
- case LAP_XMIT_S:
- /*
- * We just received the pf bit and are at the beginning
- * of a new LAP transmit window.
- * Check if there are any queued data frames, and do not
- * try to disconnect link if we send any data frames, since
- * that will change the state away form XMIT
- */
- pr_debug("%s() : queue len = %d\n", __func__,
- skb_queue_len(&self->txq));
-
- if (!skb_queue_empty(&self->txq)) {
- /* Prevent race conditions with irlap_data_request() */
- self->local_busy = TRUE;
-
- /* Theory of operation.
- * We send frames up to when we fill the window or
- * reach line capacity. Those frames will queue up
- * in the device queue, and the driver will slowly
- * send them.
- * After each frame that we send, we poll the higher
- * layer for more data. It's the right time to do
- * that because the link layer need to perform the mtt
- * and then send the first frame, so we can afford
- * to send a bit of time in kernel space.
- * The explicit flow indication allow to minimise
- * buffers (== lower latency), to avoid higher layer
- * polling via timers (== less context switches) and
- * to implement a crude scheduler - Jean II */
-
- /* Try to send away all queued data frames */
- while ((skb = skb_dequeue(&self->txq)) != NULL) {
- /* Send one frame */
- ret = (*state[self->state])(self, SEND_I_CMD,
- skb, NULL);
- /* Drop reference count.
- * It will be increase as needed in
- * irlap_send_data_xxx() */
- kfree_skb(skb);
-
- /* Poll the higher layers for one more frame */
- irlmp_flow_indication(self->notify.instance,
- FLOW_START);
-
- if (ret == -EPROTO)
- break; /* Try again later! */
- }
- /* Finished transmitting */
- self->local_busy = FALSE;
- } else if (self->disconnect_pending) {
- self->disconnect_pending = FALSE;
-
- ret = (*state[self->state])(self, DISCONNECT_REQUEST,
- NULL, NULL);
- }
- break;
-/* case LAP_NDM: */
-/* case LAP_CONN: */
-/* case LAP_RESET_WAIT: */
-/* case LAP_RESET_CHECK: */
- default:
- break;
- }
-}
-
-/*
- * Function irlap_state_ndm (event, skb, frame)
- *
- * NDM (Normal Disconnected Mode) state
- *
- */
-static int irlap_state_ndm(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- discovery_t *discovery_rsp;
- int ret = 0;
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
-
- switch (event) {
- case CONNECT_REQUEST:
- IRDA_ASSERT(self->netdev != NULL, return -1;);
-
- if (self->media_busy) {
- /* Note : this will never happen, because we test
- * media busy in irlap_connect_request() and
- * postpone the event... - Jean II */
- pr_debug("%s(), CONNECT_REQUEST: media busy!\n",
- __func__);
-
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
-
- irlap_disconnect_indication(self, LAP_MEDIA_BUSY);
- } else {
- irlap_send_snrm_frame(self, &self->qos_rx);
-
- /* Start Final-bit timer */
- irlap_start_final_timer(self, self->final_timeout);
-
- self->retry_count = 0;
- irlap_next_state(self, LAP_SETUP);
- }
- break;
- case RECV_SNRM_CMD:
- /* Check if the frame contains and I field */
- if (info) {
- self->daddr = info->daddr;
- self->caddr = info->caddr;
-
- irlap_next_state(self, LAP_CONN);
-
- irlap_connect_indication(self, skb);
- } else {
- pr_debug("%s(), SNRM frame does not contain an I field!\n",
- __func__);
- }
- break;
- case DISCOVERY_REQUEST:
- IRDA_ASSERT(info != NULL, return -1;);
-
- if (self->media_busy) {
- pr_debug("%s(), DISCOVERY_REQUEST: media busy!\n",
- __func__);
- /* irlap->log.condition = MEDIA_BUSY; */
-
- /* This will make IrLMP try again */
- irlap_discovery_confirm(self, NULL);
- /* Note : the discovery log is not cleaned up here,
- * it will be done in irlap_discovery_request()
- * Jean II */
- return 0;
- }
-
- self->S = info->S;
- self->s = info->s;
- irlap_send_discovery_xid_frame(self, info->S, info->s, TRUE,
- info->discovery);
- self->frame_sent = FALSE;
- self->s++;
-
- irlap_start_slot_timer(self, self->slot_timeout);
- irlap_next_state(self, LAP_QUERY);
- break;
- case RECV_DISCOVERY_XID_CMD:
- IRDA_ASSERT(info != NULL, return -1;);
-
- /* Assert that this is not the final slot */
- if (info->s <= info->S) {
- self->slot = irlap_generate_rand_time_slot(info->S,
- info->s);
- if (self->slot == info->s) {
- discovery_rsp = irlmp_get_discovery_response();
- discovery_rsp->data.daddr = info->daddr;
-
- irlap_send_discovery_xid_frame(self, info->S,
- self->slot,
- FALSE,
- discovery_rsp);
- self->frame_sent = TRUE;
- } else
- self->frame_sent = FALSE;
-
- /*
- * Go to reply state until end of discovery to
- * inhibit our own transmissions. Set the timer
- * to not stay forever there... Jean II
- */
- irlap_start_query_timer(self, info->S, info->s);
- irlap_next_state(self, LAP_REPLY);
- } else {
- /* This is the final slot. How is it possible ?
- * This would happen is both discoveries are just slightly
- * offset (if they are in sync, all packets are lost).
- * Most often, all the discovery requests will be received
- * in QUERY state (see my comment there), except for the
- * last frame that will come here.
- * The big trouble when it happen is that active discovery
- * doesn't happen, because nobody answer the discoveries
- * frame of the other guy, so the log shows up empty.
- * What should we do ?
- * Not much. It's too late to answer those discovery frames,
- * so we just pass the info to IrLMP who will put it in the
- * log (and post an event).
- * Another cause would be devices that do discovery much
- * slower than us, however the latest fixes should minimise
- * those cases...
- * Jean II
- */
- pr_debug("%s(), Receiving final discovery request, missed the discovery slots :-(\n",
- __func__);
-
- /* Last discovery request -> in the log */
- irlap_discovery_indication(self, info->discovery);
- }
- break;
- case MEDIA_BUSY_TIMER_EXPIRED:
- /* A bunch of events may be postponed because the media is
- * busy (usually immediately after we close a connection),
- * or while we are doing discovery (state query/reply).
- * In all those cases, the media busy flag will be cleared
- * when it's OK for us to process those postponed events.
- * This event is not mentioned in the state machines in the
- * IrLAP spec. It's because they didn't consider Ultra and
- * postponing connection request is optional.
- * Jean II */
-#ifdef CONFIG_IRDA_ULTRA
- /* Send any pending Ultra frames if any */
- if (!skb_queue_empty(&self->txq_ultra)) {
- /* We don't send the frame, just post an event.
- * Also, previously this code was in timer.c...
- * Jean II */
- ret = (*state[self->state])(self, SEND_UI_FRAME,
- NULL, NULL);
- }
-#endif /* CONFIG_IRDA_ULTRA */
- /* Check if we should try to connect.
- * This code was previously in irlap_do_event() */
- if (self->connect_pending) {
- self->connect_pending = FALSE;
-
- /* This one *should* not pend in this state, except
- * if a socket try to connect and immediately
- * disconnect. - clear - Jean II */
- if (self->disconnect_pending)
- irlap_disconnect_indication(self, LAP_DISC_INDICATION);
- else
- ret = (*state[self->state])(self,
- CONNECT_REQUEST,
- NULL, NULL);
- self->disconnect_pending = FALSE;
- }
- /* Note : one way to test if this code works well (including
- * media busy and small busy) is to create a user space
- * application generating an Ultra packet every 3.05 sec (or
- * 2.95 sec) and to see how it interact with discovery.
- * It's fairly easy to check that no packet is lost, that the
- * packets are postponed during discovery and that after
- * discovery indication you have a 100ms "gap".
- * As connection request and Ultra are now processed the same
- * way, this avoid the tedious job of trying IrLAP connection
- * in all those cases...
- * Jean II */
- break;
-#ifdef CONFIG_IRDA_ULTRA
- case SEND_UI_FRAME:
- {
- int i;
- /* Only allowed to repeat an operation twice */
- for (i=0; ((i<2) && (self->media_busy == FALSE)); i++) {
- skb = skb_dequeue(&self->txq_ultra);
- if (skb)
- irlap_send_ui_frame(self, skb, CBROADCAST,
- CMD_FRAME);
- else
- break;
- /* irlap_send_ui_frame() won't increase skb reference
- * count, so no dev_kfree_skb() - Jean II */
- }
- if (i == 2) {
- /* Force us to listen 500 ms again */
- irda_device_set_media_busy(self->netdev, TRUE);
- }
- break;
- }
- case RECV_UI_FRAME:
- /* Only accept broadcast frames in NDM mode */
- if (info->caddr != CBROADCAST) {
- pr_debug("%s(), not a broadcast frame!\n",
- __func__);
- } else
- irlap_unitdata_indication(self, skb);
- break;
-#endif /* CONFIG_IRDA_ULTRA */
- case RECV_TEST_CMD:
- /* Remove test frame header */
- skb_pull(skb, sizeof(struct test_frame));
-
- /*
- * Send response. This skb will not be sent out again, and
- * will only be used to send out the same info as the cmd
- */
- irlap_send_test_frame(self, CBROADCAST, info->daddr, skb);
- break;
- case RECV_TEST_RSP:
- pr_debug("%s() not implemented!\n", __func__);
- break;
- default:
- pr_debug("%s(), Unknown event %s\n", __func__,
- irlap_event[event]);
-
- ret = -1;
- break;
- }
- return ret;
-}
-
-/*
- * Function irlap_state_query (event, skb, info)
- *
- * QUERY state
- *
- */
-static int irlap_state_query(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- int ret = 0;
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
-
- switch (event) {
- case RECV_DISCOVERY_XID_RSP:
- IRDA_ASSERT(info != NULL, return -1;);
- IRDA_ASSERT(info->discovery != NULL, return -1;);
-
- pr_debug("%s(), daddr=%08x\n", __func__,
- info->discovery->data.daddr);
-
- if (!self->discovery_log) {
- net_warn_ratelimited("%s: discovery log is gone! maybe the discovery timeout has been set too short?\n",
- __func__);
- break;
- }
- hashbin_insert(self->discovery_log,
- (irda_queue_t *) info->discovery,
- info->discovery->data.daddr, NULL);
-
- /* Keep state */
- /* irlap_next_state(self, LAP_QUERY); */
-
- break;
- case RECV_DISCOVERY_XID_CMD:
- /* Yes, it is possible to receive those frames in this mode.
- * Note that most often the last discovery request won't
- * occur here but in NDM state (see my comment there).
- * What should we do ?
- * Not much. We are currently performing our own discovery,
- * therefore we can't answer those frames. We don't want
- * to change state either. We just pass the info to
- * IrLMP who will put it in the log (and post an event).
- * Jean II
- */
-
- IRDA_ASSERT(info != NULL, return -1;);
-
- pr_debug("%s(), Receiving discovery request (s = %d) while performing discovery :-(\n",
- __func__, info->s);
-
- /* Last discovery request ? */
- if (info->s == 0xff)
- irlap_discovery_indication(self, info->discovery);
- break;
- case SLOT_TIMER_EXPIRED:
- /*
- * Wait a little longer if we detect an incoming frame. This
- * is not mentioned in the spec, but is a good thing to do,
- * since we want to work even with devices that violate the
- * timing requirements.
- */
- if (irda_device_is_receiving(self->netdev) && !self->add_wait) {
- pr_debug("%s(), device is slow to answer, waiting some more!\n",
- __func__);
- irlap_start_slot_timer(self, msecs_to_jiffies(10));
- self->add_wait = TRUE;
- return ret;
- }
- self->add_wait = FALSE;
-
- if (self->s < self->S) {
- irlap_send_discovery_xid_frame(self, self->S,
- self->s, TRUE,
- self->discovery_cmd);
- self->s++;
- irlap_start_slot_timer(self, self->slot_timeout);
-
- /* Keep state */
- irlap_next_state(self, LAP_QUERY);
- } else {
- /* This is the final slot! */
- irlap_send_discovery_xid_frame(self, self->S, 0xff,
- TRUE,
- self->discovery_cmd);
-
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
-
- /*
- * We are now finished with the discovery procedure,
- * so now we must return the results
- */
- irlap_discovery_confirm(self, self->discovery_log);
-
- /* IrLMP should now have taken care of the log */
- self->discovery_log = NULL;
- }
- break;
- default:
- pr_debug("%s(), Unknown event %s\n", __func__,
- irlap_event[event]);
-
- ret = -1;
- break;
- }
- return ret;
-}
-
-/*
- * Function irlap_state_reply (self, event, skb, info)
- *
- * REPLY, we have received a XID discovery frame from a device and we
- * are waiting for the right time slot to send a response XID frame
- *
- */
-static int irlap_state_reply(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- discovery_t *discovery_rsp;
- int ret=0;
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
-
- switch (event) {
- case QUERY_TIMER_EXPIRED:
- pr_debug("%s(), QUERY_TIMER_EXPIRED <%ld>\n",
- __func__, jiffies);
- irlap_next_state(self, LAP_NDM);
- break;
- case RECV_DISCOVERY_XID_CMD:
- IRDA_ASSERT(info != NULL, return -1;);
- /* Last frame? */
- if (info->s == 0xff) {
- del_timer(&self->query_timer);
-
- /* info->log.condition = REMOTE; */
-
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
-
- irlap_discovery_indication(self, info->discovery);
- } else {
- /* If it's our slot, send our reply */
- if ((info->s >= self->slot) && (!self->frame_sent)) {
- discovery_rsp = irlmp_get_discovery_response();
- discovery_rsp->data.daddr = info->daddr;
-
- irlap_send_discovery_xid_frame(self, info->S,
- self->slot,
- FALSE,
- discovery_rsp);
-
- self->frame_sent = TRUE;
- }
- /* Readjust our timer to accommodate devices
- * doing faster or slower discovery than us...
- * Jean II */
- irlap_start_query_timer(self, info->S, info->s);
-
- /* Keep state */
- //irlap_next_state(self, LAP_REPLY);
- }
- break;
- default:
- pr_debug("%s(), Unknown event %d, %s\n", __func__,
- event, irlap_event[event]);
-
- ret = -1;
- break;
- }
- return ret;
-}
-
-/*
- * Function irlap_state_conn (event, skb, info)
- *
- * CONN, we have received a SNRM command and is waiting for the upper
- * layer to accept or refuse connection
- *
- */
-static int irlap_state_conn(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- int ret = 0;
-
- pr_debug("%s(), event=%s\n", __func__, irlap_event[event]);
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
-
- switch (event) {
- case CONNECT_RESPONSE:
- skb_pull(skb, sizeof(struct snrm_frame));
-
- IRDA_ASSERT(self->netdev != NULL, return -1;);
-
- irlap_qos_negotiate(self, skb);
-
- irlap_initiate_connection_state(self);
-
- /*
- * Applying the parameters now will make sure we change speed
- * *after* we have sent the next frame
- */
- irlap_apply_connection_parameters(self, FALSE);
-
- /*
- * Sending this frame will force a speed change after it has
- * been sent (i.e. the frame will be sent at 9600).
- */
- irlap_send_ua_response_frame(self, &self->qos_rx);
-
-#if 0
- /*
- * We are allowed to send two frames, but this may increase
- * the connect latency, so lets not do it for now.
- */
- /* This is full of good intentions, but doesn't work in
- * practice.
- * After sending the first UA response, we switch the
- * dongle to the negotiated speed, which is usually
- * different than 9600 kb/s.
- * From there, there is two solutions :
- * 1) The other end has received the first UA response :
- * it will set up the connection, move to state LAP_NRM_P,
- * and will ignore and drop the second UA response.
- * Actually, it's even worse : the other side will almost
- * immediately send a RR that will likely collide with the
- * UA response (depending on negotiated turnaround).
- * 2) The other end has not received the first UA response,
- * will stay at 9600 and will never see the second UA response.
- * Jean II */
- irlap_send_ua_response_frame(self, &self->qos_rx);
-#endif
-
- /*
- * The WD-timer could be set to the duration of the P-timer
- * for this case, but it is recommended to use twice the
- * value (note 3 IrLAP p. 60).
- */
- irlap_start_wd_timer(self, self->wd_timeout);
- irlap_next_state(self, LAP_NRM_S);
-
- break;
- case RECV_DISCOVERY_XID_CMD:
- pr_debug("%s(), event RECV_DISCOVER_XID_CMD!\n",
- __func__);
- irlap_next_state(self, LAP_NDM);
-
- break;
- case DISCONNECT_REQUEST:
- pr_debug("%s(), Disconnect request!\n", __func__);
- irlap_send_dm_frame(self);
- irlap_next_state( self, LAP_NDM);
- irlap_disconnect_indication(self, LAP_DISC_INDICATION);
- break;
- default:
- pr_debug("%s(), Unknown event %d, %s\n", __func__,
- event, irlap_event[event]);
-
- ret = -1;
- break;
- }
-
- return ret;
-}
-
-/*
- * Function irlap_state_setup (event, skb, frame)
- *
- * SETUP state, The local layer has transmitted a SNRM command frame to
- * a remote peer layer and is awaiting a reply .
- *
- */
-static int irlap_state_setup(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- int ret = 0;
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
-
- switch (event) {
- case FINAL_TIMER_EXPIRED:
- if (self->retry_count < self->N3) {
-/*
- * Perform random backoff, Wait a random number of time units, minimum
- * duration half the time taken to transmitt a SNRM frame, maximum duration
- * 1.5 times the time taken to transmit a SNRM frame. So this time should
- * between 15 msecs and 45 msecs.
- */
- irlap_start_backoff_timer(self, msecs_to_jiffies(20 +
- (jiffies % 30)));
- } else {
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
-
- irlap_disconnect_indication(self, LAP_FOUND_NONE);
- }
- break;
- case BACKOFF_TIMER_EXPIRED:
- irlap_send_snrm_frame(self, &self->qos_rx);
- irlap_start_final_timer(self, self->final_timeout);
- self->retry_count++;
- break;
- case RECV_SNRM_CMD:
- pr_debug("%s(), SNRM battle!\n", __func__);
-
- IRDA_ASSERT(skb != NULL, return 0;);
- IRDA_ASSERT(info != NULL, return 0;);
-
- /*
- * The device with the largest device address wins the battle
- * (both have sent a SNRM command!)
- */
- if (info &&(info->daddr > self->saddr)) {
- del_timer(&self->final_timer);
- irlap_initiate_connection_state(self);
-
- IRDA_ASSERT(self->netdev != NULL, return -1;);
-
- skb_pull(skb, sizeof(struct snrm_frame));
-
- irlap_qos_negotiate(self, skb);
-
- /* Send UA frame and then change link settings */
- irlap_apply_connection_parameters(self, FALSE);
- irlap_send_ua_response_frame(self, &self->qos_rx);
-
- irlap_next_state(self, LAP_NRM_S);
- irlap_connect_confirm(self, skb);
-
- /*
- * The WD-timer could be set to the duration of the
- * P-timer for this case, but it is recommended
- * to use twice the value (note 3 IrLAP p. 60).
- */
- irlap_start_wd_timer(self, self->wd_timeout);
- } else {
- /* We just ignore the other device! */
- irlap_next_state(self, LAP_SETUP);
- }
- break;
- case RECV_UA_RSP:
- /* Stop F-timer */
- del_timer(&self->final_timer);
-
- /* Initiate connection state */
- irlap_initiate_connection_state(self);
-
- /* Negotiate connection parameters */
- IRDA_ASSERT(skb->len > 10, return -1;);
-
- skb_pull(skb, sizeof(struct ua_frame));
-
- IRDA_ASSERT(self->netdev != NULL, return -1;);
-
- irlap_qos_negotiate(self, skb);
-
- /* Set the new link setting *now* (before the rr frame) */
- irlap_apply_connection_parameters(self, TRUE);
- self->retry_count = 0;
-
- /* Wait for turnaround time to give a chance to the other
- * device to be ready to receive us.
- * Note : the time to switch speed is typically larger
- * than the turnaround time, but as we don't have the other
- * side speed switch time, that's our best guess...
- * Jean II */
- irlap_wait_min_turn_around(self, &self->qos_tx);
-
- /* This frame will actually be sent at the new speed */
- irlap_send_rr_frame(self, CMD_FRAME);
-
- /* The timer is set to half the normal timer to quickly
- * detect a failure to negotiate the new connection
- * parameters. IrLAP 6.11.3.2, note 3.
- * Note that currently we don't process this failure
- * properly, as we should do a quick disconnect.
- * Jean II */
- irlap_start_final_timer(self, self->final_timeout/2);
- irlap_next_state(self, LAP_NRM_P);
-
- irlap_connect_confirm(self, skb);
- break;
- case RECV_DM_RSP: /* FALLTHROUGH */
- case RECV_DISC_CMD:
- del_timer(&self->final_timer);
- irlap_next_state(self, LAP_NDM);
-
- irlap_disconnect_indication(self, LAP_DISC_INDICATION);
- break;
- default:
- pr_debug("%s(), Unknown event %d, %s\n", __func__,
- event, irlap_event[event]);
-
- ret = -1;
- break;
- }
- return ret;
-}
-
-/*
- * Function irlap_state_offline (self, event, skb, info)
- *
- * OFFLINE state, not used for now!
- *
- */
-static int irlap_state_offline(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- pr_debug("%s(), Unknown event\n", __func__);
-
- return -1;
-}
-
-/*
- * Function irlap_state_xmit_p (self, event, skb, info)
- *
- * XMIT, Only the primary station has right to transmit, and we
- * therefore do not expect to receive any transmissions from other
- * stations.
- *
- */
-static int irlap_state_xmit_p(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- int ret = 0;
-
- switch (event) {
- case SEND_I_CMD:
- /*
- * Only send frame if send-window > 0.
- */
- if ((self->window > 0) && (!self->remote_busy)) {
- int nextfit;
-#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
- struct sk_buff *skb_next;
-
- /* With DYNAMIC_WINDOW, we keep the window size
- * maximum, and adapt on the packets we are sending.
- * At 115k, we can send only 2 packets of 2048 bytes
- * in a 500 ms turnaround. Without this option, we
- * would always limit the window to 2. With this
- * option, if we send smaller packets, we can send
- * up to 7 of them (always depending on QoS).
- * Jean II */
-
- /* Look at the next skb. This is safe, as we are
- * the only consumer of the Tx queue (if we are not,
- * we have other problems) - Jean II */
- skb_next = skb_peek(&self->txq);
-
- /* Check if a subsequent skb exist and would fit in
- * the current window (with respect to turnaround
- * time).
- * This allow us to properly mark the current packet
- * with the pf bit, to avoid falling back on the
- * second test below, and avoid waiting the
- * end of the window and sending a extra RR.
- * Note : (skb_next != NULL) <=> (skb_queue_len() > 0)
- * Jean II */
- nextfit = ((skb_next != NULL) &&
- ((skb_next->len + skb->len) <=
- self->bytes_left));
-
- /*
- * The current packet may not fit ! Because of test
- * above, this should not happen any more !!!
- * Test if we have transmitted more bytes over the
- * link than its possible to do with the current
- * speed and turn-around-time.
- */
- if((!nextfit) && (skb->len > self->bytes_left)) {
- pr_debug("%s(), Not allowed to transmit more bytes!\n",
- __func__);
- /* Requeue the skb */
- skb_queue_head(&self->txq, skb_get(skb));
- /*
- * We should switch state to LAP_NRM_P, but
- * that is not possible since we must be sure
- * that we poll the other side. Since we have
- * used up our time, the poll timer should
- * trigger anyway now, so we just wait for it
- * DB
- */
- /*
- * Sorry, but that's not totally true. If
- * we send 2000B packets, we may wait another
- * 1000B until our turnaround expire. That's
- * why we need to be proactive in avoiding
- * coming here. - Jean II
- */
- return -EPROTO;
- }
-
- /* Subtract space used by this skb */
- self->bytes_left -= skb->len;
-#else /* CONFIG_IRDA_DYNAMIC_WINDOW */
- /* Window has been adjusted for the max packet
- * size, so much simpler... - Jean II */
- nextfit = !skb_queue_empty(&self->txq);
-#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
- /*
- * Send data with poll bit cleared only if window > 1
- * and there is more frames after this one to be sent
- */
- if ((self->window > 1) && (nextfit)) {
- /* More packet to send in current window */
- irlap_send_data_primary(self, skb);
- irlap_next_state(self, LAP_XMIT_P);
- } else {
- /* Final packet of window */
- irlap_send_data_primary_poll(self, skb);
-
- /*
- * Make sure state machine does not try to send
- * any more frames
- */
- ret = -EPROTO;
- }
-#ifdef CONFIG_IRDA_FAST_RR
- /* Peer may want to reply immediately */
- self->fast_RR = FALSE;
-#endif /* CONFIG_IRDA_FAST_RR */
- } else {
- pr_debug("%s(), Unable to send! remote busy?\n",
- __func__);
- skb_queue_head(&self->txq, skb_get(skb));
-
- /*
- * The next ret is important, because it tells
- * irlap_next_state _not_ to deliver more frames
- */
- ret = -EPROTO;
- }
- break;
- case POLL_TIMER_EXPIRED:
- pr_debug("%s(), POLL_TIMER_EXPIRED <%ld>\n",
- __func__, jiffies);
- irlap_send_rr_frame(self, CMD_FRAME);
- /* Return to NRM properly - Jean II */
- self->window = self->window_size;
-#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
- /* Allowed to transmit a maximum number of bytes again. */
- self->bytes_left = self->line_capacity;
-#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
- irlap_start_final_timer(self, self->final_timeout);
- irlap_next_state(self, LAP_NRM_P);
- break;
- case DISCONNECT_REQUEST:
- del_timer(&self->poll_timer);
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_disc_frame(self);
- irlap_flush_all_queues(self);
- irlap_start_final_timer(self, self->final_timeout);
- self->retry_count = 0;
- irlap_next_state(self, LAP_PCLOSE);
- break;
- case DATA_REQUEST:
- /* Nothing to do, irlap_do_event() will send the packet
- * when we return... - Jean II */
- break;
- default:
- pr_debug("%s(), Unknown event %s\n",
- __func__, irlap_event[event]);
-
- ret = -EINVAL;
- break;
- }
- return ret;
-}
-
-/*
- * Function irlap_state_pclose (event, skb, info)
- *
- * PCLOSE state
- */
-static int irlap_state_pclose(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- int ret = 0;
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
-
- switch (event) {
- case RECV_UA_RSP: /* FALLTHROUGH */
- case RECV_DM_RSP:
- del_timer(&self->final_timer);
-
- /* Set new link parameters */
- irlap_apply_default_connection_parameters(self);
-
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
-
- irlap_disconnect_indication(self, LAP_DISC_INDICATION);
- break;
- case FINAL_TIMER_EXPIRED:
- if (self->retry_count < self->N3) {
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_disc_frame(self);
- irlap_start_final_timer(self, self->final_timeout);
- self->retry_count++;
- /* Keep state */
- } else {
- irlap_apply_default_connection_parameters(self);
-
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
-
- irlap_disconnect_indication(self, LAP_NO_RESPONSE);
- }
- break;
- default:
- pr_debug("%s(), Unknown event %d\n", __func__, event);
-
- ret = -1;
- break;
- }
- return ret;
-}
-
-/*
- * Function irlap_state_nrm_p (self, event, skb, info)
- *
- * NRM_P (Normal Response Mode as Primary), The primary station has given
- * permissions to a secondary station to transmit IrLAP resonse frames
- * (by sending a frame with the P bit set). The primary station will not
- * transmit any frames and is expecting to receive frames only from the
- * secondary to which transmission permissions has been given.
- */
-static int irlap_state_nrm_p(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- int ret = 0;
- int ns_status;
- int nr_status;
-
- switch (event) {
- case RECV_I_RSP: /* Optimize for the common case */
- if (unlikely(skb->len <= LAP_ADDR_HEADER + LAP_CTRL_HEADER)) {
- /*
- * Input validation check: a stir4200/mcp2150
- * combination sometimes results in an empty i:rsp.
- * This makes no sense; we can just ignore the frame
- * and send an rr:cmd immediately. This happens before
- * changing nr or ns so triggers a retransmit
- */
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_rr_frame(self, CMD_FRAME);
- /* Keep state */
- break;
- }
- /* FIXME: must check for remote_busy below */
-#ifdef CONFIG_IRDA_FAST_RR
- /*
- * Reset the fast_RR so we can use the fast RR code with
- * full speed the next time since peer may have more frames
- * to transmitt
- */
- self->fast_RR = FALSE;
-#endif /* CONFIG_IRDA_FAST_RR */
- IRDA_ASSERT( info != NULL, return -1;);
-
- ns_status = irlap_validate_ns_received(self, info->ns);
- nr_status = irlap_validate_nr_received(self, info->nr);
-
- /*
- * Check for expected I(nformation) frame
- */
- if ((ns_status == NS_EXPECTED) && (nr_status == NR_EXPECTED)) {
-
- /* Update Vr (next frame for us to receive) */
- self->vr = (self->vr + 1) % 8;
-
- /* Update Nr received, cleanup our retry queue */
- irlap_update_nr_received(self, info->nr);
-
- /*
- * Got expected NR, so reset the
- * retry_count. This is not done by IrLAP spec,
- * which is strange!
- */
- self->retry_count = 0;
- self->ack_required = TRUE;
-
- /* poll bit cleared? */
- if (!info->pf) {
- /* Keep state, do not move this line */
- irlap_next_state(self, LAP_NRM_P);
-
- irlap_data_indication(self, skb, FALSE);
- } else {
- /* No longer waiting for pf */
- del_timer(&self->final_timer);
-
- irlap_wait_min_turn_around(self, &self->qos_tx);
-
- /* Call higher layer *before* changing state
- * to give them a chance to send data in the
- * next LAP frame.
- * Jean II */
- irlap_data_indication(self, skb, FALSE);
-
- /* XMIT states are the most dangerous state
- * to be in, because user requests are
- * processed directly and may change state.
- * On the other hand, in NDM_P, those
- * requests are queued and we will process
- * them when we return to irlap_do_event().
- * Jean II
- */
- irlap_next_state(self, LAP_XMIT_P);
-
- /* This is the last frame.
- * Make sure it's always called in XMIT state.
- * - Jean II */
- irlap_start_poll_timer(self, self->poll_timeout);
- }
- break;
-
- }
- /* Unexpected next to send (Ns) */
- if ((ns_status == NS_UNEXPECTED) && (nr_status == NR_EXPECTED))
- {
- if (!info->pf) {
- irlap_update_nr_received(self, info->nr);
-
- /*
- * Wait until the last frame before doing
- * anything
- */
-
- /* Keep state */
- irlap_next_state(self, LAP_NRM_P);
- } else {
- pr_debug("%s(), missing or duplicate frame!\n",
- __func__);
-
- /* Update Nr received */
- irlap_update_nr_received(self, info->nr);
-
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_rr_frame(self, CMD_FRAME);
-
- self->ack_required = FALSE;
-
- irlap_start_final_timer(self, self->final_timeout);
- irlap_next_state(self, LAP_NRM_P);
- }
- break;
- }
- /*
- * Unexpected next to receive (Nr)
- */
- if ((ns_status == NS_EXPECTED) && (nr_status == NR_UNEXPECTED))
- {
- if (info->pf) {
- self->vr = (self->vr + 1) % 8;
-
- /* Update Nr received */
- irlap_update_nr_received(self, info->nr);
-
- /* Resend rejected frames */
- irlap_resend_rejected_frames(self, CMD_FRAME);
-
- self->ack_required = FALSE;
-
- /* Make sure we account for the time
- * to transmit our frames. See comemnts
- * in irlap_send_data_primary_poll().
- * Jean II */
- irlap_start_final_timer(self, 2 * self->final_timeout);
-
- /* Keep state, do not move this line */
- irlap_next_state(self, LAP_NRM_P);
-
- irlap_data_indication(self, skb, FALSE);
- } else {
- /*
- * Do not resend frames until the last
- * frame has arrived from the other
- * device. This is not documented in
- * IrLAP!!
- */
- self->vr = (self->vr + 1) % 8;
-
- /* Update Nr received */
- irlap_update_nr_received(self, info->nr);
-
- self->ack_required = FALSE;
-
- /* Keep state, do not move this line!*/
- irlap_next_state(self, LAP_NRM_P);
-
- irlap_data_indication(self, skb, FALSE);
- }
- break;
- }
- /*
- * Unexpected next to send (Ns) and next to receive (Nr)
- * Not documented by IrLAP!
- */
- if ((ns_status == NS_UNEXPECTED) &&
- (nr_status == NR_UNEXPECTED))
- {
- pr_debug("%s(), unexpected nr and ns!\n",
- __func__);
- if (info->pf) {
- /* Resend rejected frames */
- irlap_resend_rejected_frames(self, CMD_FRAME);
-
- /* Give peer some time to retransmit!
- * But account for our own Tx. */
- irlap_start_final_timer(self, 2 * self->final_timeout);
-
- /* Keep state, do not move this line */
- irlap_next_state(self, LAP_NRM_P);
- } else {
- /* Update Nr received */
- /* irlap_update_nr_received( info->nr); */
-
- self->ack_required = FALSE;
- }
- break;
- }
-
- /*
- * Invalid NR or NS
- */
- if ((nr_status == NR_INVALID) || (ns_status == NS_INVALID)) {
- if (info->pf) {
- del_timer(&self->final_timer);
-
- irlap_next_state(self, LAP_RESET_WAIT);
-
- irlap_disconnect_indication(self, LAP_RESET_INDICATION);
- self->xmitflag = TRUE;
- } else {
- del_timer(&self->final_timer);
-
- irlap_disconnect_indication(self, LAP_RESET_INDICATION);
-
- self->xmitflag = FALSE;
- }
- break;
- }
- pr_debug("%s(), Not implemented!\n", __func__);
- pr_debug("%s(), event=%s, ns_status=%d, nr_status=%d\n",
- __func__, irlap_event[event], ns_status, nr_status);
- break;
- case RECV_UI_FRAME:
- /* Poll bit cleared? */
- if (!info->pf) {
- irlap_data_indication(self, skb, TRUE);
- irlap_next_state(self, LAP_NRM_P);
- } else {
- del_timer(&self->final_timer);
- irlap_data_indication(self, skb, TRUE);
- irlap_next_state(self, LAP_XMIT_P);
- pr_debug("%s: RECV_UI_FRAME: next state %s\n",
- __func__, irlap_state[self->state]);
- irlap_start_poll_timer(self, self->poll_timeout);
- }
- break;
- case RECV_RR_RSP:
- /*
- * If you get a RR, the remote isn't busy anymore,
- * no matter what the NR
- */
- self->remote_busy = FALSE;
-
- /* Stop final timer */
- del_timer(&self->final_timer);
-
- /*
- * Nr as expected?
- */
- ret = irlap_validate_nr_received(self, info->nr);
- if (ret == NR_EXPECTED) {
- /* Update Nr received */
- irlap_update_nr_received(self, info->nr);
-
- /*
- * Got expected NR, so reset the retry_count. This
- * is not done by the IrLAP standard , which is
- * strange! DB.
- */
- self->retry_count = 0;
- irlap_wait_min_turn_around(self, &self->qos_tx);
-
- irlap_next_state(self, LAP_XMIT_P);
-
- /* Start poll timer */
- irlap_start_poll_timer(self, self->poll_timeout);
- } else if (ret == NR_UNEXPECTED) {
- IRDA_ASSERT(info != NULL, return -1;);
- /*
- * Unexpected nr!
- */
-
- /* Update Nr received */
- irlap_update_nr_received(self, info->nr);
-
- pr_debug("RECV_RR_FRAME: Retrans:%d, nr=%d, va=%d, vs=%d, vr=%d\n",
- self->retry_count, info->nr, self->va,
- self->vs, self->vr);
-
- /* Resend rejected frames */
- irlap_resend_rejected_frames(self, CMD_FRAME);
- irlap_start_final_timer(self, self->final_timeout * 2);
-
- irlap_next_state(self, LAP_NRM_P);
- } else if (ret == NR_INVALID) {
- pr_debug("%s(), Received RR with invalid nr !\n",
- __func__);
-
- irlap_next_state(self, LAP_RESET_WAIT);
-
- irlap_disconnect_indication(self, LAP_RESET_INDICATION);
- self->xmitflag = TRUE;
- }
- break;
- case RECV_RNR_RSP:
- IRDA_ASSERT(info != NULL, return -1;);
-
- /* Stop final timer */
- del_timer(&self->final_timer);
- self->remote_busy = TRUE;
-
- /* Update Nr received */
- irlap_update_nr_received(self, info->nr);
- irlap_next_state(self, LAP_XMIT_P);
-
- /* Start poll timer */
- irlap_start_poll_timer(self, self->poll_timeout);
- break;
- case RECV_FRMR_RSP:
- del_timer(&self->final_timer);
- self->xmitflag = TRUE;
- irlap_next_state(self, LAP_RESET_WAIT);
- irlap_reset_indication(self);
- break;
- case FINAL_TIMER_EXPIRED:
- /*
- * We are allowed to wait for additional 300 ms if
- * final timer expires when we are in the middle
- * of receiving a frame (page 45, IrLAP). Check that
- * we only do this once for each frame.
- */
- if (irda_device_is_receiving(self->netdev) && !self->add_wait) {
- pr_debug("FINAL_TIMER_EXPIRED when receiving a frame! Waiting a little bit more!\n");
- irlap_start_final_timer(self, msecs_to_jiffies(300));
-
- /*
- * Don't allow this to happen one more time in a row,
- * or else we can get a pretty tight loop here if
- * if we only receive half a frame. DB.
- */
- self->add_wait = TRUE;
- break;
- }
- self->add_wait = FALSE;
-
- /* N2 is the disconnect timer. Until we reach it, we retry */
- if (self->retry_count < self->N2) {
- if (skb_peek(&self->wx_list) == NULL) {
- /* Retry sending the pf bit to the secondary */
- pr_debug("nrm_p: resending rr");
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_rr_frame(self, CMD_FRAME);
- } else {
- pr_debug("nrm_p: resend frames");
- irlap_resend_rejected_frames(self, CMD_FRAME);
- }
-
- irlap_start_final_timer(self, self->final_timeout);
- self->retry_count++;
- pr_debug("irlap_state_nrm_p: FINAL_TIMER_EXPIRED: retry_count=%d\n",
- self->retry_count);
-
- /* Early warning event. I'm using a pretty liberal
- * interpretation of the spec and generate an event
- * every time the timer is multiple of N1 (and not
- * only the first time). This allow application
- * to know precisely if connectivity restart...
- * Jean II */
- if((self->retry_count % self->N1) == 0)
- irlap_status_indication(self,
- STATUS_NO_ACTIVITY);
-
- /* Keep state */
- } else {
- irlap_apply_default_connection_parameters(self);
-
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
- irlap_disconnect_indication(self, LAP_NO_RESPONSE);
- }
- break;
- case RECV_REJ_RSP:
- irlap_update_nr_received(self, info->nr);
- if (self->remote_busy) {
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_rr_frame(self, CMD_FRAME);
- } else
- irlap_resend_rejected_frames(self, CMD_FRAME);
- irlap_start_final_timer(self, 2 * self->final_timeout);
- break;
- case RECV_SREJ_RSP:
- irlap_update_nr_received(self, info->nr);
- if (self->remote_busy) {
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_rr_frame(self, CMD_FRAME);
- } else
- irlap_resend_rejected_frame(self, CMD_FRAME);
- irlap_start_final_timer(self, 2 * self->final_timeout);
- break;
- case RECV_RD_RSP:
- pr_debug("%s(), RECV_RD_RSP\n", __func__);
-
- irlap_flush_all_queues(self);
- irlap_next_state(self, LAP_XMIT_P);
- /* Call back the LAP state machine to do a proper disconnect */
- irlap_disconnect_request(self);
- break;
- default:
- pr_debug("%s(), Unknown event %s\n",
- __func__, irlap_event[event]);
-
- ret = -1;
- break;
- }
- return ret;
-}
-
-/*
- * Function irlap_state_reset_wait (event, skb, info)
- *
- * We have informed the service user of a reset condition, and is
- * awaiting reset of disconnect request.
- *
- */
-static int irlap_state_reset_wait(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- int ret = 0;
-
- pr_debug("%s(), event = %s\n", __func__, irlap_event[event]);
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
-
- switch (event) {
- case RESET_REQUEST:
- if (self->xmitflag) {
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_snrm_frame(self, NULL);
- irlap_start_final_timer(self, self->final_timeout);
- irlap_next_state(self, LAP_RESET);
- } else {
- irlap_start_final_timer(self, self->final_timeout);
- irlap_next_state(self, LAP_RESET);
- }
- break;
- case DISCONNECT_REQUEST:
- irlap_wait_min_turn_around( self, &self->qos_tx);
- irlap_send_disc_frame( self);
- irlap_flush_all_queues( self);
- irlap_start_final_timer( self, self->final_timeout);
- self->retry_count = 0;
- irlap_next_state( self, LAP_PCLOSE);
- break;
- default:
- pr_debug("%s(), Unknown event %s\n", __func__,
- irlap_event[event]);
-
- ret = -1;
- break;
- }
- return ret;
-}
-
-/*
- * Function irlap_state_reset (self, event, skb, info)
- *
- * We have sent a SNRM reset command to the peer layer, and is awaiting
- * reply.
- *
- */
-static int irlap_state_reset(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- int ret = 0;
-
- pr_debug("%s(), event = %s\n", __func__, irlap_event[event]);
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
-
- switch (event) {
- case RECV_DISC_CMD:
- del_timer(&self->final_timer);
-
- irlap_apply_default_connection_parameters(self);
-
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
-
- irlap_disconnect_indication(self, LAP_NO_RESPONSE);
-
- break;
- case RECV_UA_RSP:
- del_timer(&self->final_timer);
-
- /* Initiate connection state */
- irlap_initiate_connection_state(self);
-
- irlap_reset_confirm();
-
- self->remote_busy = FALSE;
-
- irlap_next_state(self, LAP_XMIT_P);
-
- irlap_start_poll_timer(self, self->poll_timeout);
-
- break;
- case FINAL_TIMER_EXPIRED:
- if (self->retry_count < 3) {
- irlap_wait_min_turn_around(self, &self->qos_tx);
-
- IRDA_ASSERT(self->netdev != NULL, return -1;);
- irlap_send_snrm_frame(self, self->qos_dev);
-
- self->retry_count++; /* Experimental!! */
-
- irlap_start_final_timer(self, self->final_timeout);
- irlap_next_state(self, LAP_RESET);
- } else if (self->retry_count >= self->N3) {
- irlap_apply_default_connection_parameters(self);
-
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
-
- irlap_disconnect_indication(self, LAP_NO_RESPONSE);
- }
- break;
- case RECV_SNRM_CMD:
- /*
- * SNRM frame is not allowed to contain an I-field in this
- * state
- */
- if (!info) {
- pr_debug("%s(), RECV_SNRM_CMD\n", __func__);
- irlap_initiate_connection_state(self);
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_ua_response_frame(self, &self->qos_rx);
- irlap_reset_confirm();
- irlap_start_wd_timer(self, self->wd_timeout);
- irlap_next_state(self, LAP_NDM);
- } else {
- pr_debug("%s(), SNRM frame contained an I field!\n",
- __func__);
- }
- break;
- default:
- pr_debug("%s(), Unknown event %s\n",
- __func__, irlap_event[event]);
-
- ret = -1;
- break;
- }
- return ret;
-}
-
-/*
- * Function irlap_state_xmit_s (event, skb, info)
- *
- * XMIT_S, The secondary station has been given the right to transmit,
- * and we therefore do not expect to receive any transmissions from other
- * stations.
- */
-static int irlap_state_xmit_s(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- int ret = 0;
-
- pr_debug("%s(), event=%s\n", __func__, irlap_event[event]);
-
- IRDA_ASSERT(self != NULL, return -ENODEV;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return -EBADR;);
-
- switch (event) {
- case SEND_I_CMD:
- /*
- * Send frame only if send window > 0
- */
- if ((self->window > 0) && (!self->remote_busy)) {
- int nextfit;
-#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
- struct sk_buff *skb_next;
-
- /*
- * Same deal as in irlap_state_xmit_p(), so see
- * the comments at that point.
- * We are the secondary, so there are only subtle
- * differences. - Jean II
- */
-
- /* Check if a subsequent skb exist and would fit in
- * the current window (with respect to turnaround
- * time). - Jean II */
- skb_next = skb_peek(&self->txq);
- nextfit = ((skb_next != NULL) &&
- ((skb_next->len + skb->len) <=
- self->bytes_left));
-
- /*
- * Test if we have transmitted more bytes over the
- * link than its possible to do with the current
- * speed and turn-around-time.
- */
- if((!nextfit) && (skb->len > self->bytes_left)) {
- pr_debug("%s(), Not allowed to transmit more bytes!\n",
- __func__);
- /* Requeue the skb */
- skb_queue_head(&self->txq, skb_get(skb));
-
- /*
- * Switch to NRM_S, this is only possible
- * when we are in secondary mode, since we
- * must be sure that we don't miss any RR
- * frames
- */
- self->window = self->window_size;
- self->bytes_left = self->line_capacity;
- irlap_start_wd_timer(self, self->wd_timeout);
-
- irlap_next_state(self, LAP_NRM_S);
- /* Slight difference with primary :
- * here we would wait for the other side to
- * expire the turnaround. - Jean II */
-
- return -EPROTO; /* Try again later */
- }
- /* Subtract space used by this skb */
- self->bytes_left -= skb->len;
-#else /* CONFIG_IRDA_DYNAMIC_WINDOW */
- /* Window has been adjusted for the max packet
- * size, so much simpler... - Jean II */
- nextfit = !skb_queue_empty(&self->txq);
-#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
- /*
- * Send data with final bit cleared only if window > 1
- * and there is more frames to be sent
- */
- if ((self->window > 1) && (nextfit)) {
- irlap_send_data_secondary(self, skb);
- irlap_next_state(self, LAP_XMIT_S);
- } else {
- irlap_send_data_secondary_final(self, skb);
- irlap_next_state(self, LAP_NRM_S);
-
- /*
- * Make sure state machine does not try to send
- * any more frames
- */
- ret = -EPROTO;
- }
- } else {
- pr_debug("%s(), Unable to send!\n", __func__);
- skb_queue_head(&self->txq, skb_get(skb));
- ret = -EPROTO;
- }
- break;
- case DISCONNECT_REQUEST:
- irlap_send_rd_frame(self);
- irlap_flush_all_queues(self);
- irlap_start_wd_timer(self, self->wd_timeout);
- irlap_next_state(self, LAP_SCLOSE);
- break;
- case DATA_REQUEST:
- /* Nothing to do, irlap_do_event() will send the packet
- * when we return... - Jean II */
- break;
- default:
- pr_debug("%s(), Unknown event %s\n", __func__,
- irlap_event[event]);
-
- ret = -EINVAL;
- break;
- }
- return ret;
-}
-
-/*
- * Function irlap_state_nrm_s (event, skb, info)
- *
- * NRM_S (Normal Response Mode as Secondary) state, in this state we are
- * expecting to receive frames from the primary station
- *
- */
-static int irlap_state_nrm_s(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- int ns_status;
- int nr_status;
- int ret = 0;
-
- pr_debug("%s(), event=%s\n", __func__, irlap_event[event]);
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
-
- switch (event) {
- case RECV_I_CMD: /* Optimize for the common case */
- /* FIXME: must check for remote_busy below */
- pr_debug("%s(), event=%s nr=%d, vs=%d, ns=%d, vr=%d, pf=%d\n",
- __func__, irlap_event[event], info->nr,
- self->vs, info->ns, self->vr, info->pf);
-
- self->retry_count = 0;
-
- ns_status = irlap_validate_ns_received(self, info->ns);
- nr_status = irlap_validate_nr_received(self, info->nr);
- /*
- * Check for expected I(nformation) frame
- */
- if ((ns_status == NS_EXPECTED) && (nr_status == NR_EXPECTED)) {
-
- /* Update Vr (next frame for us to receive) */
- self->vr = (self->vr + 1) % 8;
-
- /* Update Nr received */
- irlap_update_nr_received(self, info->nr);
-
- /*
- * poll bit cleared?
- */
- if (!info->pf) {
-
- self->ack_required = TRUE;
-
- /*
- * Starting WD-timer here is optional, but
- * not recommended. Note 6 IrLAP p. 83
- */
-#if 0
- irda_start_timer(WD_TIMER, self->wd_timeout);
-#endif
- /* Keep state, do not move this line */
- irlap_next_state(self, LAP_NRM_S);
-
- irlap_data_indication(self, skb, FALSE);
- break;
- } else {
- /*
- * We should wait before sending RR, and
- * also before changing to XMIT_S
- * state. (note 1, IrLAP p. 82)
- */
- irlap_wait_min_turn_around(self, &self->qos_tx);
-
- /*
- * Give higher layers a chance to
- * immediately reply with some data before
- * we decide if we should send a RR frame
- * or not
- */
- irlap_data_indication(self, skb, FALSE);
-
- /* Any pending data requests? */
- if (!skb_queue_empty(&self->txq) &&
- (self->window > 0))
- {
- self->ack_required = TRUE;
-
- del_timer(&self->wd_timer);
-
- irlap_next_state(self, LAP_XMIT_S);
- } else {
- irlap_send_rr_frame(self, RSP_FRAME);
- irlap_start_wd_timer(self,
- self->wd_timeout);
-
- /* Keep the state */
- irlap_next_state(self, LAP_NRM_S);
- }
- break;
- }
- }
- /*
- * Check for Unexpected next to send (Ns)
- */
- if ((ns_status == NS_UNEXPECTED) && (nr_status == NR_EXPECTED))
- {
- /* Unexpected next to send, with final bit cleared */
- if (!info->pf) {
- irlap_update_nr_received(self, info->nr);
-
- irlap_start_wd_timer(self, self->wd_timeout);
- } else {
- /* Update Nr received */
- irlap_update_nr_received(self, info->nr);
-
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_rr_frame(self, RSP_FRAME);
-
- irlap_start_wd_timer(self, self->wd_timeout);
- }
- break;
- }
-
- /*
- * Unexpected Next to Receive(NR) ?
- */
- if ((ns_status == NS_EXPECTED) && (nr_status == NR_UNEXPECTED))
- {
- if (info->pf) {
- pr_debug("RECV_I_RSP: frame(s) lost\n");
-
- self->vr = (self->vr + 1) % 8;
-
- /* Update Nr received */
- irlap_update_nr_received(self, info->nr);
-
- /* Resend rejected frames */
- irlap_resend_rejected_frames(self, RSP_FRAME);
-
- /* Keep state, do not move this line */
- irlap_next_state(self, LAP_NRM_S);
-
- irlap_data_indication(self, skb, FALSE);
- irlap_start_wd_timer(self, self->wd_timeout);
- break;
- }
- /*
- * This is not documented in IrLAP!! Unexpected NR
- * with poll bit cleared
- */
- if (!info->pf) {
- self->vr = (self->vr + 1) % 8;
-
- /* Update Nr received */
- irlap_update_nr_received(self, info->nr);
-
- /* Keep state, do not move this line */
- irlap_next_state(self, LAP_NRM_S);
-
- irlap_data_indication(self, skb, FALSE);
- irlap_start_wd_timer(self, self->wd_timeout);
- }
- break;
- }
-
- if (ret == NR_INVALID) {
- pr_debug("NRM_S, NR_INVALID not implemented!\n");
- }
- if (ret == NS_INVALID) {
- pr_debug("NRM_S, NS_INVALID not implemented!\n");
- }
- break;
- case RECV_UI_FRAME:
- /*
- * poll bit cleared?
- */
- if (!info->pf) {
- irlap_data_indication(self, skb, TRUE);
- irlap_next_state(self, LAP_NRM_S); /* Keep state */
- } else {
- /*
- * Any pending data requests?
- */
- if (!skb_queue_empty(&self->txq) &&
- (self->window > 0) && !self->remote_busy)
- {
- irlap_data_indication(self, skb, TRUE);
-
- del_timer(&self->wd_timer);
-
- irlap_next_state(self, LAP_XMIT_S);
- } else {
- irlap_data_indication(self, skb, TRUE);
-
- irlap_wait_min_turn_around(self, &self->qos_tx);
-
- irlap_send_rr_frame(self, RSP_FRAME);
- self->ack_required = FALSE;
-
- irlap_start_wd_timer(self, self->wd_timeout);
-
- /* Keep the state */
- irlap_next_state(self, LAP_NRM_S);
- }
- }
- break;
- case RECV_RR_CMD:
- self->retry_count = 0;
-
- /*
- * Nr as expected?
- */
- nr_status = irlap_validate_nr_received(self, info->nr);
- if (nr_status == NR_EXPECTED) {
- if (!skb_queue_empty(&self->txq) &&
- (self->window > 0)) {
- self->remote_busy = FALSE;
-
- /* Update Nr received */
- irlap_update_nr_received(self, info->nr);
- del_timer(&self->wd_timer);
-
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_next_state(self, LAP_XMIT_S);
- } else {
- self->remote_busy = FALSE;
- /* Update Nr received */
- irlap_update_nr_received(self, info->nr);
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_start_wd_timer(self, self->wd_timeout);
-
- /* Note : if the link is idle (this case),
- * we never go in XMIT_S, so we never get a
- * chance to process any DISCONNECT_REQUEST.
- * Do it now ! - Jean II */
- if (self->disconnect_pending) {
- /* Disconnect */
- irlap_send_rd_frame(self);
- irlap_flush_all_queues(self);
-
- irlap_next_state(self, LAP_SCLOSE);
- } else {
- /* Just send back pf bit */
- irlap_send_rr_frame(self, RSP_FRAME);
-
- irlap_next_state(self, LAP_NRM_S);
- }
- }
- } else if (nr_status == NR_UNEXPECTED) {
- self->remote_busy = FALSE;
- irlap_update_nr_received(self, info->nr);
- irlap_resend_rejected_frames(self, RSP_FRAME);
-
- irlap_start_wd_timer(self, self->wd_timeout);
-
- /* Keep state */
- irlap_next_state(self, LAP_NRM_S);
- } else {
- pr_debug("%s(), invalid nr not implemented!\n",
- __func__);
- }
- break;
- case RECV_SNRM_CMD:
- /* SNRM frame is not allowed to contain an I-field */
- if (!info) {
- del_timer(&self->wd_timer);
- pr_debug("%s(), received SNRM cmd\n", __func__);
- irlap_next_state(self, LAP_RESET_CHECK);
-
- irlap_reset_indication(self);
- } else {
- pr_debug("%s(), SNRM frame contained an I-field!\n",
- __func__);
-
- }
- break;
- case RECV_REJ_CMD:
- irlap_update_nr_received(self, info->nr);
- if (self->remote_busy) {
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_rr_frame(self, RSP_FRAME);
- } else
- irlap_resend_rejected_frames(self, RSP_FRAME);
- irlap_start_wd_timer(self, self->wd_timeout);
- break;
- case RECV_SREJ_CMD:
- irlap_update_nr_received(self, info->nr);
- if (self->remote_busy) {
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_rr_frame(self, RSP_FRAME);
- } else
- irlap_resend_rejected_frame(self, RSP_FRAME);
- irlap_start_wd_timer(self, self->wd_timeout);
- break;
- case WD_TIMER_EXPIRED:
- /*
- * Wait until retry_count * n matches negotiated threshold/
- * disconnect time (note 2 in IrLAP p. 82)
- *
- * Similar to irlap_state_nrm_p() -> FINAL_TIMER_EXPIRED
- * Note : self->wd_timeout = (self->final_timeout * 2),
- * which explain why we use (self->N2 / 2) here !!!
- * Jean II
- */
- pr_debug("%s(), retry_count = %d\n", __func__,
- self->retry_count);
-
- if (self->retry_count < (self->N2 / 2)) {
- /* No retry, just wait for primary */
- irlap_start_wd_timer(self, self->wd_timeout);
- self->retry_count++;
-
- if((self->retry_count % (self->N1 / 2)) == 0)
- irlap_status_indication(self,
- STATUS_NO_ACTIVITY);
- } else {
- irlap_apply_default_connection_parameters(self);
-
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
- irlap_disconnect_indication(self, LAP_NO_RESPONSE);
- }
- break;
- case RECV_DISC_CMD:
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
-
- /* Send disconnect response */
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_ua_response_frame(self, NULL);
-
- del_timer(&self->wd_timer);
- irlap_flush_all_queues(self);
- /* Set default link parameters */
- irlap_apply_default_connection_parameters(self);
-
- irlap_disconnect_indication(self, LAP_DISC_INDICATION);
- break;
- case RECV_DISCOVERY_XID_CMD:
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_rr_frame(self, RSP_FRAME);
- self->ack_required = TRUE;
- irlap_start_wd_timer(self, self->wd_timeout);
- irlap_next_state(self, LAP_NRM_S);
-
- break;
- case RECV_TEST_CMD:
- /* Remove test frame header (only LAP header in NRM) */
- skb_pull(skb, LAP_ADDR_HEADER + LAP_CTRL_HEADER);
-
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_start_wd_timer(self, self->wd_timeout);
-
- /* Send response (info will be copied) */
- irlap_send_test_frame(self, self->caddr, info->daddr, skb);
- break;
- default:
- pr_debug("%s(), Unknown event %d, (%s)\n", __func__,
- event, irlap_event[event]);
-
- ret = -EINVAL;
- break;
- }
- return ret;
-}
-
-/*
- * Function irlap_state_sclose (self, event, skb, info)
- */
-static int irlap_state_sclose(struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb, struct irlap_info *info)
-{
- IRDA_ASSERT(self != NULL, return -ENODEV;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return -EBADR;);
-
- switch (event) {
- case RECV_DISC_CMD:
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
-
- /* Send disconnect response */
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_ua_response_frame(self, NULL);
-
- del_timer(&self->wd_timer);
- /* Set default link parameters */
- irlap_apply_default_connection_parameters(self);
-
- irlap_disconnect_indication(self, LAP_DISC_INDICATION);
- break;
- case RECV_DM_RSP:
- /* IrLAP-1.1 p.82: in SCLOSE, S and I type RSP frames
- * shall take us down into default NDM state, like DM_RSP
- */
- case RECV_RR_RSP:
- case RECV_RNR_RSP:
- case RECV_REJ_RSP:
- case RECV_SREJ_RSP:
- case RECV_I_RSP:
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
-
- del_timer(&self->wd_timer);
- irlap_apply_default_connection_parameters(self);
-
- irlap_disconnect_indication(self, LAP_DISC_INDICATION);
- break;
- case WD_TIMER_EXPIRED:
- /* Always switch state before calling upper layers */
- irlap_next_state(self, LAP_NDM);
-
- irlap_apply_default_connection_parameters(self);
-
- irlap_disconnect_indication(self, LAP_DISC_INDICATION);
- break;
- default:
- /* IrLAP-1.1 p.82: in SCLOSE, basically any received frame
- * with pf=1 shall restart the wd-timer and resend the rd:rsp
- */
- if (info != NULL && info->pf) {
- del_timer(&self->wd_timer);
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_rd_frame(self);
- irlap_start_wd_timer(self, self->wd_timeout);
- break; /* stay in SCLOSE */
- }
-
- pr_debug("%s(), Unknown event %d, (%s)\n", __func__,
- event, irlap_event[event]);
-
- break;
- }
-
- return -1;
-}
-
-static int irlap_state_reset_check( struct irlap_cb *self, IRLAP_EVENT event,
- struct sk_buff *skb,
- struct irlap_info *info)
-{
- int ret = 0;
-
- pr_debug("%s(), event=%s\n", __func__, irlap_event[event]);
-
- IRDA_ASSERT(self != NULL, return -ENODEV;);
- IRDA_ASSERT(self->magic == LAP_MAGIC, return -EBADR;);
-
- switch (event) {
- case RESET_RESPONSE:
- irlap_send_ua_response_frame(self, &self->qos_rx);
- irlap_initiate_connection_state(self);
- irlap_start_wd_timer(self, WD_TIMEOUT);
- irlap_flush_all_queues(self);
-
- irlap_next_state(self, LAP_NRM_S);
- break;
- case DISCONNECT_REQUEST:
- irlap_wait_min_turn_around(self, &self->qos_tx);
- irlap_send_rd_frame(self);
- irlap_start_wd_timer(self, WD_TIMEOUT);
- irlap_next_state(self, LAP_SCLOSE);
- break;
- default:
- pr_debug("%s(), Unknown event %d, (%s)\n", __func__,
- event, irlap_event[event]);
-
- ret = -EINVAL;
- break;
- }
- return ret;
-}
projects / linux-2.6-block.git / blobdiff