forked from Minki/linux
96de0e252c
* Convert files to UTF-8.
* Also correct some people's names
(one example is Eißfeldt, which was found in a source file.
Given that the author used an ß at all in a source file
indicates that the real name has in fact a 'ß' and not an 'ss',
which is commonly used as a substitute for 'ß' when limited to
7bit.)
* Correct town names (Goettingen -> Göttingen)
* Update Eberhard Mönkeberg's address (http://lkml.org/lkml/2007/1/8/313)
Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
2314 lines
65 KiB
C
2314 lines
65 KiB
C
/*********************************************************************
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*
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* Filename: irlap_event.c
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* Version: 0.9
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* Description: IrLAP state machine implementation
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* Status: Experimental.
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* Author: Dag Brattli <dag@brattli.net>
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* Created at: Sat Aug 16 00:59:29 1997
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* Modified at: Sat Dec 25 21:07:57 1999
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* Modified by: Dag Brattli <dag@brattli.net>
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*
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* Copyright (c) 1998-2000 Dag Brattli <dag@brattli.net>,
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* Copyright (c) 1998 Thomas Davis <ratbert@radiks.net>
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* All Rights Reserved.
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* Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* Neither Dag Brattli nor University of Tromsø admit liability nor
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* provide warranty for any of this software. This material is
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* provided "AS-IS" and at no charge.
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*
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********************************************************************/
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/skbuff.h>
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#include <net/irda/irda.h>
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#include <net/irda/irlap_event.h>
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#include <net/irda/timer.h>
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#include <net/irda/irlap.h>
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#include <net/irda/irlap_frame.h>
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#include <net/irda/qos.h>
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#include <net/irda/parameters.h>
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#include <net/irda/irlmp.h> /* irlmp_flow_indication(), ... */
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#include <net/irda/irda_device.h>
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#ifdef CONFIG_IRDA_FAST_RR
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int sysctl_fast_poll_increase = 50;
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#endif
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static int irlap_state_ndm (struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_query (struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_reply (struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_conn (struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_setup (struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_offline(struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_xmit_p (struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_pclose (struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_nrm_p (struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_reset_wait(struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_reset (struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_nrm_s (struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_xmit_s (struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_sclose (struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info);
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static int irlap_state_reset_check(struct irlap_cb *, IRLAP_EVENT event,
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struct sk_buff *, struct irlap_info *);
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#ifdef CONFIG_IRDA_DEBUG
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static const char *irlap_event[] = {
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"DISCOVERY_REQUEST",
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"CONNECT_REQUEST",
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"CONNECT_RESPONSE",
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"DISCONNECT_REQUEST",
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"DATA_REQUEST",
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"RESET_REQUEST",
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"RESET_RESPONSE",
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"SEND_I_CMD",
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"SEND_UI_FRAME",
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"RECV_DISCOVERY_XID_CMD",
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"RECV_DISCOVERY_XID_RSP",
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"RECV_SNRM_CMD",
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"RECV_TEST_CMD",
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"RECV_TEST_RSP",
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"RECV_UA_RSP",
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"RECV_DM_RSP",
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"RECV_RD_RSP",
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"RECV_I_CMD",
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"RECV_I_RSP",
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"RECV_UI_FRAME",
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"RECV_FRMR_RSP",
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"RECV_RR_CMD",
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"RECV_RR_RSP",
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"RECV_RNR_CMD",
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"RECV_RNR_RSP",
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"RECV_REJ_CMD",
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"RECV_REJ_RSP",
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"RECV_SREJ_CMD",
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"RECV_SREJ_RSP",
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"RECV_DISC_CMD",
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"SLOT_TIMER_EXPIRED",
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"QUERY_TIMER_EXPIRED",
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"FINAL_TIMER_EXPIRED",
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"POLL_TIMER_EXPIRED",
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"DISCOVERY_TIMER_EXPIRED",
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"WD_TIMER_EXPIRED",
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"BACKOFF_TIMER_EXPIRED",
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"MEDIA_BUSY_TIMER_EXPIRED",
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};
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#endif /* CONFIG_IRDA_DEBUG */
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const char *irlap_state[] = {
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"LAP_NDM",
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"LAP_QUERY",
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"LAP_REPLY",
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"LAP_CONN",
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"LAP_SETUP",
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"LAP_OFFLINE",
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"LAP_XMIT_P",
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"LAP_PCLOSE",
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"LAP_NRM_P",
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"LAP_RESET_WAIT",
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"LAP_RESET",
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"LAP_NRM_S",
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"LAP_XMIT_S",
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"LAP_SCLOSE",
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"LAP_RESET_CHECK",
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};
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static int (*state[])(struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info) =
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{
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irlap_state_ndm,
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irlap_state_query,
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irlap_state_reply,
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irlap_state_conn,
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irlap_state_setup,
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irlap_state_offline,
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irlap_state_xmit_p,
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irlap_state_pclose,
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irlap_state_nrm_p,
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irlap_state_reset_wait,
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irlap_state_reset,
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irlap_state_nrm_s,
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irlap_state_xmit_s,
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irlap_state_sclose,
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irlap_state_reset_check,
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};
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/*
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* Function irda_poll_timer_expired (data)
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*
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* Poll timer has expired. Normally we must now send a RR frame to the
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* remote device
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*/
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static void irlap_poll_timer_expired(void *data)
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{
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struct irlap_cb *self = (struct irlap_cb *) data;
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL);
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}
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/*
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* Calculate and set time before we will have to send back the pf bit
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* to the peer. Use in primary.
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* Make sure that state is XMIT_P/XMIT_S when calling this function
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* (and that nobody messed up with the state). - Jean II
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*/
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static void irlap_start_poll_timer(struct irlap_cb *self, int timeout)
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{
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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#ifdef CONFIG_IRDA_FAST_RR
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/*
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* Send out the RR frames faster if our own transmit queue is empty, or
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* if the peer is busy. The effect is a much faster conversation
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*/
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if (skb_queue_empty(&self->txq) || self->remote_busy) {
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if (self->fast_RR == TRUE) {
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/*
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* Assert that the fast poll timer has not reached the
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* normal poll timer yet
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*/
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if (self->fast_RR_timeout < timeout) {
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/*
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* FIXME: this should be a more configurable
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* function
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*/
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self->fast_RR_timeout +=
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(sysctl_fast_poll_increase * HZ/1000);
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/* Use this fast(er) timeout instead */
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timeout = self->fast_RR_timeout;
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}
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} else {
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self->fast_RR = TRUE;
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/* Start with just 0 ms */
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self->fast_RR_timeout = 0;
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timeout = 0;
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}
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} else
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self->fast_RR = FALSE;
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IRDA_DEBUG(3, "%s(), timeout=%d (%ld)\n", __FUNCTION__, timeout, jiffies);
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#endif /* CONFIG_IRDA_FAST_RR */
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if (timeout == 0)
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irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL);
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else
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irda_start_timer(&self->poll_timer, timeout, self,
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irlap_poll_timer_expired);
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}
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/*
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* Function irlap_do_event (event, skb, info)
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*
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* Rushes through the state machine without any delay. If state == XMIT
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* then send queued data frames.
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*/
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void irlap_do_event(struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info)
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{
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int ret;
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if (!self || self->magic != LAP_MAGIC)
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return;
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IRDA_DEBUG(3, "%s(), event = %s, state = %s\n", __FUNCTION__,
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irlap_event[event], irlap_state[self->state]);
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ret = (*state[self->state])(self, event, skb, info);
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/*
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* Check if there are any pending events that needs to be executed
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*/
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switch (self->state) {
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case LAP_XMIT_P: /* FALLTHROUGH */
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case LAP_XMIT_S:
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/*
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* We just received the pf bit and are at the beginning
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* of a new LAP transmit window.
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* Check if there are any queued data frames, and do not
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* try to disconnect link if we send any data frames, since
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* that will change the state away form XMIT
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*/
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IRDA_DEBUG(2, "%s() : queue len = %d\n", __FUNCTION__,
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skb_queue_len(&self->txq));
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if (!skb_queue_empty(&self->txq)) {
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/* Prevent race conditions with irlap_data_request() */
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self->local_busy = TRUE;
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/* Theory of operation.
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* We send frames up to when we fill the window or
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* reach line capacity. Those frames will queue up
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* in the device queue, and the driver will slowly
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* send them.
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* After each frame that we send, we poll the higher
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* layer for more data. It's the right time to do
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* that because the link layer need to perform the mtt
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* and then send the first frame, so we can afford
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* to send a bit of time in kernel space.
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* The explicit flow indication allow to minimise
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* buffers (== lower latency), to avoid higher layer
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* polling via timers (== less context switches) and
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* to implement a crude scheduler - Jean II */
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/* Try to send away all queued data frames */
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while ((skb = skb_dequeue(&self->txq)) != NULL) {
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/* Send one frame */
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ret = (*state[self->state])(self, SEND_I_CMD,
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skb, NULL);
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/* Drop reference count.
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* It will be increase as needed in
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* irlap_send_data_xxx() */
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kfree_skb(skb);
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/* Poll the higher layers for one more frame */
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irlmp_flow_indication(self->notify.instance,
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FLOW_START);
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if (ret == -EPROTO)
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break; /* Try again later! */
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}
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/* Finished transmitting */
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self->local_busy = FALSE;
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} else if (self->disconnect_pending) {
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self->disconnect_pending = FALSE;
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ret = (*state[self->state])(self, DISCONNECT_REQUEST,
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NULL, NULL);
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}
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break;
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/* case LAP_NDM: */
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/* case LAP_CONN: */
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/* case LAP_RESET_WAIT: */
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/* case LAP_RESET_CHECK: */
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default:
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break;
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}
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}
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/*
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* Function irlap_state_ndm (event, skb, frame)
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*
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* NDM (Normal Disconnected Mode) state
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*
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*/
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static int irlap_state_ndm(struct irlap_cb *self, IRLAP_EVENT event,
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struct sk_buff *skb, struct irlap_info *info)
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{
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discovery_t *discovery_rsp;
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int ret = 0;
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IRDA_ASSERT(self != NULL, return -1;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
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switch (event) {
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case CONNECT_REQUEST:
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IRDA_ASSERT(self->netdev != NULL, return -1;);
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if (self->media_busy) {
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/* Note : this will never happen, because we test
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* media busy in irlap_connect_request() and
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* postpone the event... - Jean II */
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IRDA_DEBUG(0, "%s(), CONNECT_REQUEST: media busy!\n",
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__FUNCTION__);
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/* Always switch state before calling upper layers */
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irlap_next_state(self, LAP_NDM);
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irlap_disconnect_indication(self, LAP_MEDIA_BUSY);
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} else {
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irlap_send_snrm_frame(self, &self->qos_rx);
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/* Start Final-bit timer */
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irlap_start_final_timer(self, self->final_timeout);
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self->retry_count = 0;
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irlap_next_state(self, LAP_SETUP);
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}
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break;
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case RECV_SNRM_CMD:
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/* Check if the frame contains and I field */
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if (info) {
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self->daddr = info->daddr;
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self->caddr = info->caddr;
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irlap_next_state(self, LAP_CONN);
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irlap_connect_indication(self, skb);
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} else {
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IRDA_DEBUG(0, "%s(), SNRM frame does not "
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"contain an I field!\n", __FUNCTION__);
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}
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break;
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case DISCOVERY_REQUEST:
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IRDA_ASSERT(info != NULL, return -1;);
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|
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if (self->media_busy) {
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IRDA_DEBUG(1, "%s(), DISCOVERY_REQUEST: media busy!\n",
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__FUNCTION__);
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/* irlap->log.condition = MEDIA_BUSY; */
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|
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/* This will make IrLMP try again */
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irlap_discovery_confirm(self, NULL);
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/* Note : the discovery log is not cleaned up here,
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* it will be done in irlap_discovery_request()
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* Jean II */
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return 0;
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}
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self->S = info->S;
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self->s = info->s;
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irlap_send_discovery_xid_frame(self, info->S, info->s, TRUE,
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info->discovery);
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self->frame_sent = FALSE;
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self->s++;
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|
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irlap_start_slot_timer(self, self->slot_timeout);
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irlap_next_state(self, LAP_QUERY);
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break;
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case RECV_DISCOVERY_XID_CMD:
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IRDA_ASSERT(info != NULL, return -1;);
|
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|
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/* Assert that this is not the final slot */
|
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if (info->s <= info->S) {
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self->slot = irlap_generate_rand_time_slot(info->S,
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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,
|
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self->slot,
|
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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
|
|
*/
|
|
IRDA_DEBUG(1, "%s(), Receiving final discovery request, missed the discovery slots :-(\n", __FUNCTION__);
|
|
|
|
/* 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) {
|
|
IRDA_DEBUG(0, "%s(), not a broadcast frame!\n",
|
|
__FUNCTION__);
|
|
} 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:
|
|
IRDA_DEBUG(0, "%s() not implemented!\n", __FUNCTION__);
|
|
break;
|
|
default:
|
|
IRDA_DEBUG(2, "%s(), Unknown event %s\n", __FUNCTION__,
|
|
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;);
|
|
|
|
IRDA_DEBUG(4, "%s(), daddr=%08x\n", __FUNCTION__,
|
|
info->discovery->data.daddr);
|
|
|
|
if (!self->discovery_log) {
|
|
IRDA_WARNING("%s: discovery log is gone! "
|
|
"maybe the discovery timeout has been set"
|
|
" too short?\n", __FUNCTION__);
|
|
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;);
|
|
|
|
IRDA_DEBUG(1, "%s(), Receiving discovery request (s = %d) while performing discovery :-(\n", __FUNCTION__, 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) {
|
|
IRDA_DEBUG(2, "%s(), device is slow to answer, "
|
|
"waiting some more!\n", __FUNCTION__);
|
|
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:
|
|
IRDA_DEBUG(2, "%s(), Unknown event %s\n", __FUNCTION__,
|
|
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_DEBUG(4, "%s()\n", __FUNCTION__);
|
|
|
|
IRDA_ASSERT(self != NULL, return -1;);
|
|
IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
|
|
|
|
switch (event) {
|
|
case QUERY_TIMER_EXPIRED:
|
|
IRDA_DEBUG(0, "%s(), QUERY_TIMER_EXPIRED <%ld>\n",
|
|
__FUNCTION__, 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 accomodate 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:
|
|
IRDA_DEBUG(1, "%s(), Unknown event %d, %s\n", __FUNCTION__,
|
|
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;
|
|
|
|
IRDA_DEBUG(4, "%s(), event=%s\n", __FUNCTION__, 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:
|
|
IRDA_DEBUG(3, "%s(), event RECV_DISCOVER_XID_CMD!\n",
|
|
__FUNCTION__);
|
|
irlap_next_state(self, LAP_NDM);
|
|
|
|
break;
|
|
case DISCONNECT_REQUEST:
|
|
IRDA_DEBUG(0, "%s(), Disconnect request!\n", __FUNCTION__);
|
|
irlap_send_dm_frame(self);
|
|
irlap_next_state( self, LAP_NDM);
|
|
irlap_disconnect_indication(self, LAP_DISC_INDICATION);
|
|
break;
|
|
default:
|
|
IRDA_DEBUG(1, "%s(), Unknown event %d, %s\n", __FUNCTION__,
|
|
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_DEBUG(4, "%s()\n", __FUNCTION__);
|
|
|
|
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:
|
|
IRDA_DEBUG(4, "%s(), SNRM battle!\n", __FUNCTION__);
|
|
|
|
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 negociate 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:
|
|
IRDA_DEBUG(1, "%s(), Unknown event %d, %s\n", __FUNCTION__,
|
|
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)
|
|
{
|
|
IRDA_DEBUG( 0, "%s(), Unknown event\n", __FUNCTION__);
|
|
|
|
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)) {
|
|
IRDA_DEBUG(0, "%s(), Not allowed to transmit"
|
|
" more bytes!\n", __FUNCTION__);
|
|
/* 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;
|
|
}
|
|
|
|
/* Substract 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 {
|
|
IRDA_DEBUG(4, "%s(), Unable to send! remote busy?\n",
|
|
__FUNCTION__);
|
|
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:
|
|
IRDA_DEBUG(3, "%s(), POLL_TIMER_EXPIRED <%ld>\n",
|
|
__FUNCTION__, 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:
|
|
IRDA_DEBUG(0, "%s(), Unknown event %s\n",
|
|
__FUNCTION__, 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_DEBUG(1, "%s()\n", __FUNCTION__);
|
|
|
|
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:
|
|
IRDA_DEBUG(1, "%s(), Unknown event %d\n", __FUNCTION__, 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 */
|
|
/* 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 {
|
|
IRDA_DEBUG(4,
|
|
"%s(), missing or duplicate frame!\n",
|
|
__FUNCTION__);
|
|
|
|
/* 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))
|
|
{
|
|
IRDA_DEBUG(4, "%s(), unexpected nr and ns!\n",
|
|
__FUNCTION__);
|
|
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;
|
|
}
|
|
IRDA_DEBUG(1, "%s(), Not implemented!\n", __FUNCTION__);
|
|
IRDA_DEBUG(1, "%s(), event=%s, ns_status=%d, nr_status=%d\n",
|
|
__FUNCTION__, 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);
|
|
IRDA_DEBUG(1, "%s: RECV_UI_FRAME: next state %s\n", __FUNCTION__, 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);
|
|
|
|
IRDA_DEBUG(4, "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) {
|
|
IRDA_DEBUG(1, "%s(), Received RR with "
|
|
"invalid nr !\n", __FUNCTION__);
|
|
|
|
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) {
|
|
IRDA_DEBUG(1, "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) {
|
|
/* Retry sending the pf bit to the secondary */
|
|
irlap_wait_min_turn_around(self, &self->qos_tx);
|
|
irlap_send_rr_frame(self, CMD_FRAME);
|
|
|
|
irlap_start_final_timer(self, self->final_timeout);
|
|
self->retry_count++;
|
|
IRDA_DEBUG(4, "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:
|
|
IRDA_DEBUG(1, "%s(), RECV_RD_RSP\n", __FUNCTION__);
|
|
|
|
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:
|
|
IRDA_DEBUG(1, "%s(), Unknown event %s\n",
|
|
__FUNCTION__, 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;
|
|
|
|
IRDA_DEBUG(3, "%s(), event = %s\n", __FUNCTION__, 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:
|
|
IRDA_DEBUG(2, "%s(), Unknown event %s\n", __FUNCTION__,
|
|
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;
|
|
|
|
IRDA_DEBUG(3, "%s(), event = %s\n", __FUNCTION__, 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) {
|
|
IRDA_DEBUG(3, "%s(), RECV_SNRM_CMD\n", __FUNCTION__);
|
|
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 {
|
|
IRDA_DEBUG(0,
|
|
"%s(), SNRM frame contained an I field!\n",
|
|
__FUNCTION__);
|
|
}
|
|
break;
|
|
default:
|
|
IRDA_DEBUG(1, "%s(), Unknown event %s\n",
|
|
__FUNCTION__, 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 therefor 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;
|
|
|
|
IRDA_DEBUG(4, "%s(), event=%s\n", __FUNCTION__, 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)) {
|
|
IRDA_DEBUG(0, "%s(), Not allowed to transmit"
|
|
" more bytes!\n", __FUNCTION__);
|
|
/* 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 */
|
|
}
|
|
/* Substract 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 {
|
|
IRDA_DEBUG(2, "%s(), Unable to send!\n", __FUNCTION__);
|
|
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:
|
|
IRDA_DEBUG(2, "%s(), Unknown event %s\n", __FUNCTION__,
|
|
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;
|
|
|
|
IRDA_DEBUG(4, "%s(), event=%s\n", __FUNCTION__, 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 */
|
|
IRDA_DEBUG(4, "%s(), event=%s nr=%d, vs=%d, ns=%d, "
|
|
"vr=%d, pf=%d\n", __FUNCTION__,
|
|
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) {
|
|
IRDA_DEBUG(4, "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) {
|
|
IRDA_DEBUG(0, "NRM_S, NR_INVALID not implemented!\n");
|
|
}
|
|
if (ret == NS_INVALID) {
|
|
IRDA_DEBUG(0, "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 {
|
|
IRDA_DEBUG(1, "%s(), invalid nr not implemented!\n",
|
|
__FUNCTION__);
|
|
}
|
|
break;
|
|
case RECV_SNRM_CMD:
|
|
/* SNRM frame is not allowed to contain an I-field */
|
|
if (!info) {
|
|
del_timer(&self->wd_timer);
|
|
IRDA_DEBUG(1, "%s(), received SNRM cmd\n", __FUNCTION__);
|
|
irlap_next_state(self, LAP_RESET_CHECK);
|
|
|
|
irlap_reset_indication(self);
|
|
} else {
|
|
IRDA_DEBUG(0,
|
|
"%s(), SNRM frame contained an I-field!\n",
|
|
__FUNCTION__);
|
|
|
|
}
|
|
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
|
|
*/
|
|
IRDA_DEBUG(1, "%s(), retry_count = %d\n", __FUNCTION__,
|
|
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:
|
|
IRDA_DEBUG(1, "%s(), Unknown event %d, (%s)\n", __FUNCTION__,
|
|
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)
|
|
{
|
|
int ret = 0;
|
|
|
|
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
|
|
|
|
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 */
|
|
}
|
|
|
|
IRDA_DEBUG(1, "%s(), Unknown event %d, (%s)\n", __FUNCTION__,
|
|
event, irlap_event[event]);
|
|
|
|
ret = -EINVAL;
|
|
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;
|
|
|
|
IRDA_DEBUG(1, "%s(), event=%s\n", __FUNCTION__, 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:
|
|
IRDA_DEBUG(1, "%s(), Unknown event %d, (%s)\n", __FUNCTION__,
|
|
event, irlap_event[event]);
|
|
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|