211 строки
7.4 KiB
C
211 строки
7.4 KiB
C
/*********************************************************************
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*
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* Filename: irttp.h
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* Version: 1.0
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* Description: Tiny Transport Protocol (TTP) definitions
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* Status: Experimental.
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* Author: Dag Brattli <dagb@cs.uit.no>
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* Created at: Sun Aug 31 20:14:31 1997
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* Modified at: Sun Dec 12 13:09:07 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 IRTTP_H
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#define IRTTP_H
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <net/irda/irda.h>
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#include <net/irda/irlmp.h> /* struct lsap_cb */
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#include <net/irda/qos.h> /* struct qos_info */
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#include <net/irda/irqueue.h>
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#define TTP_MAX_CONNECTIONS LM_MAX_CONNECTIONS
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#define TTP_HEADER 1
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#define TTP_MAX_HEADER (TTP_HEADER + LMP_MAX_HEADER)
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#define TTP_SAR_HEADER 5
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#define TTP_PARAMETERS 0x80
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#define TTP_MORE 0x80
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/* Transmission queue sizes */
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/* Worst case scenario, two window of data - Jean II */
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#define TTP_TX_MAX_QUEUE 14
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/* We need to keep at least 5 frames to make sure that we can refill
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* appropriately the LAP layer. LAP keeps only two buffers, and we need
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* to have 7 to make a full window - Jean II */
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#define TTP_TX_LOW_THRESHOLD 5
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/* Most clients are synchronous with respect to flow control, so we can
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* keep a low number of Tx buffers in TTP - Jean II */
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#define TTP_TX_HIGH_THRESHOLD 7
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/* Receive queue sizes */
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/* Minimum of credit that the peer should hold.
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* If the peer has less credits than 9 frames, we will explicitly send
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* him some credits (through irttp_give_credit() and a specific frame).
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* Note that when we give credits it's likely that it won't be sent in
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* this LAP window, but in the next one. So, we make sure that the peer
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* has something to send while waiting for credits (one LAP window == 7
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* + 1 frames while he process the credits). - Jean II */
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#define TTP_RX_MIN_CREDIT 8
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/* This is the default maximum number of credits held by the peer, so the
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* default maximum number of frames he can send us before needing flow
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* control answer from us (this may be negociated differently at TSAP setup).
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* We want to minimise the number of times we have to explicitly send some
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* credit to the peer, hoping we can piggyback it on the return data. In
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* particular, it doesn't make sense for us to send credit more than once
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* per LAP window.
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* Moreover, giving credits has some latency, so we need strictly more than
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* a LAP window, otherwise we may already have credits in our Tx queue.
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* But on the other hand, we don't want to keep too many Rx buffer here
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* before starting to flow control the other end, so make it exactly one
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* LAP window + 1 + MIN_CREDITS. - Jean II */
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#define TTP_RX_DEFAULT_CREDIT 16
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/* Maximum number of credits we can allow the peer to have, and therefore
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* maximum Rx queue size.
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* Note that we try to deliver packets to the higher layer every time we
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* receive something, so in normal mode the Rx queue will never contains
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* more than one or two packets. - Jean II */
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#define TTP_RX_MAX_CREDIT 21
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/* What clients should use when calling ttp_open_tsap() */
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#define DEFAULT_INITIAL_CREDIT TTP_RX_DEFAULT_CREDIT
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/* Some priorities for disconnect requests */
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#define P_NORMAL 0
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#define P_HIGH 1
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#define TTP_SAR_DISABLE 0
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#define TTP_SAR_UNBOUND 0xffffffff
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/* Parameters */
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#define TTP_MAX_SDU_SIZE 0x01
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/*
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* This structure contains all data assosiated with one instance of a TTP
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* connection.
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*/
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struct tsap_cb {
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irda_queue_t q; /* Must be first */
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magic_t magic; /* Just in case */
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__u8 stsap_sel; /* Source TSAP */
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__u8 dtsap_sel; /* Destination TSAP */
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struct lsap_cb *lsap; /* Corresponding LSAP to this TSAP */
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__u8 connected; /* TSAP connected */
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__u8 initial_credit; /* Initial credit to give peer */
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int avail_credit; /* Available credit to return to peer */
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int remote_credit; /* Credit held by peer TTP entity */
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int send_credit; /* Credit held by local TTP entity */
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struct sk_buff_head tx_queue; /* Frames to be transmitted */
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struct sk_buff_head rx_queue; /* Received frames */
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struct sk_buff_head rx_fragments;
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int tx_queue_lock;
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int rx_queue_lock;
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spinlock_t lock;
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notify_t notify; /* Callbacks to client layer */
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struct net_device_stats stats;
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struct timer_list todo_timer;
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__u32 max_seg_size; /* Max data that fit into an IrLAP frame */
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__u8 max_header_size;
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int rx_sdu_busy; /* RxSdu.busy */
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__u32 rx_sdu_size; /* Current size of a partially received frame */
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__u32 rx_max_sdu_size; /* Max receive user data size */
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int tx_sdu_busy; /* TxSdu.busy */
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__u32 tx_max_sdu_size; /* Max transmit user data size */
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int close_pend; /* Close, but disconnect_pend */
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unsigned long disconnect_pend; /* Disconnect, but still data to send */
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struct sk_buff *disconnect_skb;
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};
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struct irttp_cb {
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magic_t magic;
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hashbin_t *tsaps;
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};
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int irttp_init(void);
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void irttp_cleanup(void);
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struct tsap_cb *irttp_open_tsap(__u8 stsap_sel, int credit, notify_t *notify);
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int irttp_close_tsap(struct tsap_cb *self);
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int irttp_data_request(struct tsap_cb *self, struct sk_buff *skb);
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int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb);
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int irttp_connect_request(struct tsap_cb *self, __u8 dtsap_sel,
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__u32 saddr, __u32 daddr,
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struct qos_info *qos, __u32 max_sdu_size,
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struct sk_buff *userdata);
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int irttp_connect_response(struct tsap_cb *self, __u32 max_sdu_size,
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struct sk_buff *userdata);
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int irttp_disconnect_request(struct tsap_cb *self, struct sk_buff *skb,
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int priority);
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void irttp_flow_request(struct tsap_cb *self, LOCAL_FLOW flow);
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struct tsap_cb *irttp_dup(struct tsap_cb *self, void *instance);
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static inline __u32 irttp_get_saddr(struct tsap_cb *self)
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{
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return irlmp_get_saddr(self->lsap);
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}
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static inline __u32 irttp_get_daddr(struct tsap_cb *self)
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{
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return irlmp_get_daddr(self->lsap);
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}
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static inline __u32 irttp_get_max_seg_size(struct tsap_cb *self)
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{
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return self->max_seg_size;
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}
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/* After doing a irttp_dup(), this get one of the two socket back into
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* a state where it's waiting incomming connections.
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* Note : this can be used *only* if the socket is not yet connected
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* (i.e. NO irttp_connect_response() done on this socket).
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* - Jean II */
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static inline void irttp_listen(struct tsap_cb *self)
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{
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irlmp_listen(self->lsap);
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self->dtsap_sel = LSAP_ANY;
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}
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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 irttp_is_primary(struct tsap_cb *self)
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{
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if ((self == NULL) ||
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(self->lsap == NULL) ||
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(self->lsap->lap == NULL) ||
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(self->lsap->lap->irlap == NULL))
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return -2;
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return(irlap_is_primary(self->lsap->lap->irlap));
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}
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#endif /* IRTTP_H */
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