293 lines
9.4 KiB
C
293 lines
9.4 KiB
C
/*********************************************************************
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*
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* Filename: irlap.h
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* Version: 0.8
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* Description: An IrDA LAP driver for Linux
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* Status: Experimental.
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* Author: Dag Brattli <dagb@cs.uit.no>
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* Created at: Mon Aug 4 20:40:53 1997
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* Modified at: Fri Dec 10 13:21:17 1999
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* Modified by: Dag Brattli <dagb@cs.uit.no>
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*
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* Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>,
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* All Rights Reserved.
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* Copyright (c) 2000-2002 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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#ifndef IRLAP_H
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#define IRLAP_H
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/timer.h>
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#include <net/irda/irqueue.h> /* irda_queue_t */
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#include <net/irda/qos.h> /* struct qos_info */
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#include <net/irda/discovery.h> /* discovery_t */
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#include <net/irda/irlap_event.h> /* IRLAP_STATE, ... */
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#include <net/irda/irmod.h> /* struct notify_t */
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#define CONFIG_IRDA_DYNAMIC_WINDOW 1
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#define LAP_RELIABLE 1
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#define LAP_UNRELIABLE 0
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#define LAP_ADDR_HEADER 1 /* IrLAP Address Header */
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#define LAP_CTRL_HEADER 1 /* IrLAP Control Header */
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/* May be different when we get VFIR */
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#define LAP_MAX_HEADER (LAP_ADDR_HEADER + LAP_CTRL_HEADER)
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/* Each IrDA device gets a random 32 bits IRLAP device address */
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#define LAP_ALEN 4
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#define BROADCAST 0xffffffff /* Broadcast device address */
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#define CBROADCAST 0xfe /* Connection broadcast address */
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#define XID_FORMAT 0x01 /* Discovery XID format */
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/* Nobody seems to use this constant. */
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#define LAP_WINDOW_SIZE 8
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/* We keep the LAP queue very small to minimise the amount of buffering.
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* this improve latency and reduce resource consumption.
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* This work only because we have synchronous refilling of IrLAP through
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* the flow control mechanism (via scheduler and IrTTP).
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* 2 buffers is the minimum we can work with, one that we send while polling
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* IrTTP, and another to know that we should not send the pf bit.
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* Jean II */
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#define LAP_HIGH_THRESHOLD 2
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/* Some rare non TTP clients don't implement flow control, and
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* so don't comply with the above limit (and neither with this one).
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* For IAP and management, it doesn't matter, because they never transmit much.
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*.For IrLPT, this should be fixed.
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* - Jean II */
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#define LAP_MAX_QUEUE 10
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/* Please note that all IrDA management frames (LMP/TTP conn req/disc and
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* IAS queries) fall in the second category and are sent to LAP even if TTP
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* is stopped. This means that those frames will wait only a maximum of
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* two (2) data frames before beeing sent on the "wire", which speed up
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* new socket setup when the link is saturated.
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* Same story for two sockets competing for the medium : if one saturates
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* the LAP, when the other want to transmit it only has to wait for
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* maximum three (3) packets (2 + one scheduling), which improve performance
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* of delay sensitive applications.
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* Jean II */
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#define NR_EXPECTED 1
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#define NR_UNEXPECTED 0
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#define NR_INVALID -1
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#define NS_EXPECTED 1
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#define NS_UNEXPECTED 0
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#define NS_INVALID -1
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/*
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* Meta information passed within the IrLAP state machine
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*/
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struct irlap_info {
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__u8 caddr; /* Connection address */
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__u8 control; /* Frame type */
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__u8 cmd;
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__u32 saddr;
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__u32 daddr;
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int pf; /* Poll/final bit set */
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__u8 nr; /* Sequence number of next frame expected */
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__u8 ns; /* Sequence number of frame sent */
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int S; /* Number of slots */
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int slot; /* Random chosen slot */
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int s; /* Current slot */
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discovery_t *discovery; /* Discovery information */
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};
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/* Main structure of IrLAP */
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struct irlap_cb {
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irda_queue_t q; /* Must be first */
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magic_t magic;
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/* Device we are attached to */
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struct net_device *netdev;
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char hw_name[2*IFNAMSIZ + 1];
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/* Connection state */
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volatile IRLAP_STATE state; /* Current state */
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/* Timers used by IrLAP */
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struct timer_list query_timer;
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struct timer_list slot_timer;
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struct timer_list discovery_timer;
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struct timer_list final_timer;
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struct timer_list poll_timer;
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struct timer_list wd_timer;
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struct timer_list backoff_timer;
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/* Media busy stuff */
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struct timer_list media_busy_timer;
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int media_busy;
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/* Timeouts which will be different with different turn time */
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int slot_timeout;
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int poll_timeout;
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int final_timeout;
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int wd_timeout;
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struct sk_buff_head txq; /* Frames to be transmitted */
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struct sk_buff_head txq_ultra;
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__u8 caddr; /* Connection address */
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__u32 saddr; /* Source device address */
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__u32 daddr; /* Destination device address */
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int retry_count; /* Times tried to establish connection */
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int add_wait; /* True if we are waiting for frame */
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__u8 connect_pending;
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__u8 disconnect_pending;
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/* To send a faster RR if tx queue empty */
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#ifdef CONFIG_IRDA_FAST_RR
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int fast_RR_timeout;
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int fast_RR;
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#endif /* CONFIG_IRDA_FAST_RR */
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int N1; /* N1 * F-timer = Negitiated link disconnect warning threshold */
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int N2; /* N2 * F-timer = Negitiated link disconnect time */
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int N3; /* Connection retry count */
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int local_busy;
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int remote_busy;
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int xmitflag;
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__u8 vs; /* Next frame to be sent */
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__u8 vr; /* Next frame to be received */
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__u8 va; /* Last frame acked */
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int window; /* Nr of I-frames allowed to send */
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int window_size; /* Current negotiated window size */
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#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
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__u32 line_capacity; /* Number of bytes allowed to send */
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__u32 bytes_left; /* Number of bytes still allowed to transmit */
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#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
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struct sk_buff_head wx_list;
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__u8 ack_required;
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/* XID parameters */
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__u8 S; /* Number of slots */
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__u8 slot; /* Random chosen slot */
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__u8 s; /* Current slot */
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int frame_sent; /* Have we sent reply? */
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hashbin_t *discovery_log;
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discovery_t *discovery_cmd;
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__u32 speed; /* Link speed */
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struct qos_info qos_tx; /* QoS requested by peer */
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struct qos_info qos_rx; /* QoS requested by self */
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struct qos_info *qos_dev; /* QoS supported by device */
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notify_t notify; /* Callbacks to IrLMP */
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int mtt_required; /* Minumum turnaround time required */
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int xbofs_delay; /* Nr of XBOF's used to MTT */
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int bofs_count; /* Negotiated extra BOFs */
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int next_bofs; /* Negotiated extra BOFs after next frame */
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};
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/*
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* Function prototypes
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*/
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int irlap_init(void);
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void irlap_cleanup(void);
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struct irlap_cb *irlap_open(struct net_device *dev, struct qos_info *qos,
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const char *hw_name);
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void irlap_close(struct irlap_cb *self);
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void irlap_connect_request(struct irlap_cb *self, __u32 daddr,
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struct qos_info *qos, int sniff);
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void irlap_connect_response(struct irlap_cb *self, struct sk_buff *skb);
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void irlap_connect_indication(struct irlap_cb *self, struct sk_buff *skb);
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void irlap_connect_confirm(struct irlap_cb *, struct sk_buff *skb);
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void irlap_data_indication(struct irlap_cb *, struct sk_buff *, int unreliable);
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void irlap_data_request(struct irlap_cb *, struct sk_buff *, int unreliable);
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#ifdef CONFIG_IRDA_ULTRA
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void irlap_unitdata_request(struct irlap_cb *, struct sk_buff *);
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void irlap_unitdata_indication(struct irlap_cb *, struct sk_buff *);
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#endif /* CONFIG_IRDA_ULTRA */
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void irlap_disconnect_request(struct irlap_cb *);
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void irlap_disconnect_indication(struct irlap_cb *, LAP_REASON reason);
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void irlap_status_indication(struct irlap_cb *, int quality_of_link);
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void irlap_test_request(__u8 *info, int len);
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void irlap_discovery_request(struct irlap_cb *, discovery_t *discovery);
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void irlap_discovery_confirm(struct irlap_cb *, hashbin_t *discovery_log);
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void irlap_discovery_indication(struct irlap_cb *, discovery_t *discovery);
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void irlap_reset_indication(struct irlap_cb *self);
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void irlap_reset_confirm(void);
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void irlap_update_nr_received(struct irlap_cb *, int nr);
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int irlap_validate_nr_received(struct irlap_cb *, int nr);
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int irlap_validate_ns_received(struct irlap_cb *, int ns);
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int irlap_generate_rand_time_slot(int S, int s);
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void irlap_initiate_connection_state(struct irlap_cb *);
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void irlap_flush_all_queues(struct irlap_cb *);
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void irlap_wait_min_turn_around(struct irlap_cb *, struct qos_info *);
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void irlap_apply_default_connection_parameters(struct irlap_cb *self);
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void irlap_apply_connection_parameters(struct irlap_cb *self, int now);
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#define IRLAP_GET_HEADER_SIZE(self) (LAP_MAX_HEADER)
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#define IRLAP_GET_TX_QUEUE_LEN(self) skb_queue_len(&self->txq)
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/* Return TRUE if the node is in primary mode (i.e. master)
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* - Jean II */
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static inline int irlap_is_primary(struct irlap_cb *self)
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{
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int ret;
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switch(self->state) {
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case LAP_XMIT_P:
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case LAP_NRM_P:
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ret = 1;
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break;
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case LAP_XMIT_S:
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case LAP_NRM_S:
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ret = 0;
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break;
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default:
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ret = -1;
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}
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return(ret);
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}
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/* Clear a pending IrLAP disconnect. - Jean II */
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static inline void irlap_clear_disconnect(struct irlap_cb *self)
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{
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self->disconnect_pending = FALSE;
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}
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#endif
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