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