aboutsummaryrefslogtreecommitdiffstats
path: root/include/net/irda/irttp.h
blob: 11aee7a2972a67e08eb7afa508264e23a37ac833 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
/*********************************************************************
 *                
 * Filename:      irttp.h
 * Version:       1.0
 * Description:   Tiny Transport Protocol (TTP) definitions
 * Status:        Experimental.
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sun Aug 31 20:14:31 1997
 * Modified at:   Sun Dec 12 13:09:07 1999
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 * 
 *     Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>, 
 *     All Rights Reserved.
 *     Copyright (c) 2000-2002 Jean Tourrilhes <jt@hpl.hp.com>
 *     
 *     This program is free software; you can redistribute it and/or 
 *     modify it under the terms of the GNU General Public License as 
 *     published by the Free Software Foundation; either version 2 of 
 *     the License, or (at your option) any later version.
 *
 *     Neither Dag Brattli nor University of Tromsø admit liability nor
 *     provide warranty for any of this software. This material is 
 *     provided "AS-IS" and at no charge.
 *
 ********************************************************************/

#ifndef IRTTP_H
#define IRTTP_H

#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>

#include <net/irda/irda.h>
#include <net/irda/irlmp.h>		/* struct lsap_cb */
#include <net/irda/qos.h>		/* struct qos_info */
#include <net/irda/irqueue.h>

#define TTP_MAX_CONNECTIONS    LM_MAX_CONNECTIONS
#define TTP_HEADER             1
#define TTP_MAX_HEADER         (TTP_HEADER + LMP_MAX_HEADER)
#define TTP_SAR_HEADER         5
#define TTP_PARAMETERS         0x80
#define TTP_MORE               0x80

/* Transmission queue sizes */
/* Worst case scenario, two window of data - Jean II */
#define TTP_TX_MAX_QUEUE	14
/* We need to keep at least 5 frames to make sure that we can refill
 * appropriately the LAP layer. LAP keeps only two buffers, and we need
 * to have 7 to make a full window - Jean II */
#define TTP_TX_LOW_THRESHOLD	5
/* Most clients are synchronous with respect to flow control, so we can
 * keep a low number of Tx buffers in TTP - Jean II */
#define TTP_TX_HIGH_THRESHOLD	7

/* Receive queue sizes */
/* Minimum of credit that the peer should hold.
 * If the peer has less credits than 9 frames, we will explicitly send
 * him some credits (through irttp_give_credit() and a specific frame).
 * Note that when we give credits it's likely that it won't be sent in
 * this LAP window, but in the next one. So, we make sure that the peer
 * has something to send while waiting for credits (one LAP window == 7
 * + 1 frames while he process the credits). - Jean II */
#define TTP_RX_MIN_CREDIT	8
/* This is the default maximum number of credits held by the peer, so the
 * default maximum number of frames he can send us before needing flow
 * control answer from us (this may be negociated differently at TSAP setup).
 * We want to minimise the number of times we have to explicitly send some
 * credit to the peer, hoping we can piggyback it on the return data. In
 * particular, it doesn't make sense for us to send credit more than once
 * per LAP window.
 * Moreover, giving credits has some latency, so we need strictly more than
 * a LAP window, otherwise we may already have credits in our Tx queue.
 * But on the other hand, we don't want to keep too many Rx buffer here
 * before starting to flow control the other end, so make it exactly one
 * LAP window + 1 + MIN_CREDITS. - Jean II */
#define TTP_RX_DEFAULT_CREDIT	16
/* Maximum number of credits we can allow the peer to have, and therefore
 * maximum Rx queue size.
 * Note that we try to deliver packets to the higher layer every time we
 * receive something, so in normal mode the Rx queue will never contains
 * more than one or two packets. - Jean II */
#define TTP_RX_MAX_CREDIT	21

/* What clients should use when calling ttp_open_tsap() */
#define DEFAULT_INITIAL_CREDIT	TTP_RX_DEFAULT_CREDIT

/* Some priorities for disconnect requests */
#define P_NORMAL    0
#define P_HIGH      1

#define TTP_SAR_DISABLE 0
#define TTP_SAR_UNBOUND 0xffffffff

/* Parameters */
#define TTP_MAX_SDU_SIZE 0x01

/*
 *  This structure contains all data associated with one instance of a TTP 
 *  connection.
 */
struct tsap_cb {
	irda_queue_t q;            /* Must be first */
	magic_t magic;        /* Just in case */

	__u8 stsap_sel;       /* Source TSAP */
	__u8 dtsap_sel;       /* Destination TSAP */

	struct lsap_cb *lsap; /* Corresponding LSAP to this TSAP */

	__u8 connected;       /* TSAP connected */
	 
	__u8 initial_credit;  /* Initial credit to give peer */

        int avail_credit;    /* Available credit to return to peer */
	int remote_credit;   /* Credit held by peer TTP entity */
	int send_credit;     /* Credit held by local TTP entity */
	
	struct sk_buff_head tx_queue; /* Frames to be transmitted */
	struct sk_buff_head rx_queue; /* Received frames */
	struct sk_buff_head rx_fragments;
	int tx_queue_lock;
	int rx_queue_lock;
	spinlock_t lock;

	notify_t notify;       /* Callbacks to client layer */

	struct net_device_stats stats;
	struct timer_list todo_timer; 

	__u32 max_seg_size;     /* Max data that fit into an IrLAP frame */
	__u8  max_header_size;

	int   rx_sdu_busy;     /* RxSdu.busy */
	__u32 rx_sdu_size;     /* Current size of a partially received frame */
	__u32 rx_max_sdu_size; /* Max receive user data size */

	int tx_sdu_busy;       /* TxSdu.busy */
	__u32 tx_max_sdu_size; /* Max transmit user data size */

	int close_pend;        /* Close, but disconnect_pend */
	unsigned long disconnect_pend; /* Disconnect, but still data to send */
	struct sk_buff *disconnect_skb;
};

struct irttp_cb {
	magic_t    magic;	
	hashbin_t *tsaps;
};

int  irttp_init(void);
void irttp_cleanup(void);

struct tsap_cb *irttp_open_tsap(__u8 stsap_sel, int credit, notify_t *notify);
int irttp_close_tsap(struct tsap_cb *self);

int irttp_data_request(struct tsap_cb *self, struct sk_buff *skb);
int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb);

int irttp_connect_request(struct tsap_cb *self, __u8 dtsap_sel, 
			  __u32 saddr, __u32 daddr,
			  struct qos_info *qos, __u32 max_sdu_size, 
			  struct sk_buff *userdata);
int irttp_connect_response(struct tsap_cb *self, __u32 max_sdu_size, 
			    struct sk_buff *userdata);
int irttp_disconnect_request(struct tsap_cb *self, struct sk_buff *skb,
			     int priority);
void irttp_flow_request(struct tsap_cb *self, LOCAL_FLOW flow);
struct tsap_cb *irttp_dup(struct tsap_cb *self, void *instance);

static inline __u32 irttp_get_saddr(struct tsap_cb *self)
{
	return irlmp_get_saddr(self->lsap);
}

static inline __u32 irttp_get_daddr(struct tsap_cb *self)
{
	return irlmp_get_daddr(self->lsap);
}

static inline __u32 irttp_get_max_seg_size(struct tsap_cb *self)
{
	return self->max_seg_size;
}

/* After doing a irttp_dup(), this get one of the two socket back into
 * a state where it's waiting incomming connections.
 * Note : this can be used *only* if the socket is not yet connected
 * (i.e. NO irttp_connect_response() done on this socket).
 * - Jean II */
static inline void irttp_listen(struct tsap_cb *self)
{
	irlmp_listen(self->lsap);
	self->dtsap_sel = LSAP_ANY;
}

/* Return TRUE if the node is in primary mode (i.e. master)
 * - Jean II */
static inline int irttp_is_primary(struct tsap_cb *self)
{
	if ((self == NULL) ||
	    (self->lsap == NULL) ||
	    (self->lsap->lap == NULL) ||
	    (self->lsap->lap->irlap == NULL))
		return -2;
	return(irlap_is_primary(self->lsap->lap->irlap));
}

#endif /* IRTTP_H */