xref: /original-bsd/sys/deprecated/netimp/if_imp.h (revision da0b1171)
1 /*
2  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
3  * All rights reserved.
4  *
5  * %sccs.include.redist.c%
6  *
7  *	@(#)if_imp.h	7.7 (Berkeley) 06/28/90
8  */
9 
10 /*
11  * Structure of IMP 1822 long leader.
12  */
13 struct control_leader {
14 	u_char	dl_format;	/* 1-8   leader format */
15 	u_char	dl_network;	/* 9-16  src/dest network */
16 	u_char	dl_flags;	/* 17-24 leader flags */
17 	u_char	dl_mtype;	/* 25-32 message type */
18 	u_char	dl_htype;	/* 33-40 handling type */
19 	u_char	dl_host;	/* 41-48 host number */
20 	u_short	dl_imp;		/* 49-64 imp field */
21 	u_char	dl_link;	/* 65-72 link number */
22 	u_char	dl_subtype;	/* 73-80 message subtype */
23 };
24 
25 struct imp_leader {
26 	struct	control_leader il_dl;
27 #define	il_format	il_dl.dl_format
28 #define	il_network	il_dl.dl_network
29 #define	il_flags	il_dl.dl_flags
30 #define	il_mtype	il_dl.dl_mtype
31 #define	il_htype	il_dl.dl_htype
32 #define	il_host		il_dl.dl_host
33 #define	il_imp		il_dl.dl_imp
34 #define	il_link		il_dl.dl_link
35 #define	il_subtype	il_dl.dl_subtype
36 	u_short	il_length;	/* message length */
37 };
38 
39 #define	IMP_MAXHOSTMSG	8	/* max messages in flight to a host */
40 #define	IMP_NOOPCNT	3	/* # of noops to send imp on reset */
41 /* insure things are even... */
42 #define	IMPMTU		((8159 / NBBY) & ~01)
43 #define	IMP_RCVBUF	((8159 / NBBY + 2) & ~01)
44 
45 /*
46  * IMP-host flags
47  */
48 #define	IMP_1822L_H2I	0xd	/* 1822L host-to-imp, 96-bit format */
49 #define	IMP_1822L_I2H	0xe	/* 1822L imp-to-host, 96-bit format */
50 #define	IMP_NFF		0xf	/* 96-bit (new) format */
51 #define	IMP_TRACE	0x8	/* trace message route */
52 
53 /*
54  * IMP-host message types.
55  */
56 #define	IMPTYPE_DATA		0	/* data for protocol */
57 #define	IMPTYPE_BADLEADER	1	/* leader error */
58 #define	IMPTYPE_DOWN		2	/* imp going down */
59 #define	IMPTYPE_NOOP		4	/* noop seen during initialization */
60 #define	IMPTYPE_RFNM		5	/* request for new messages */
61 #define	IMPTYPE_HOSTDEAD	6	/* host doesn't respond */
62 #define	IMPTYPE_HOSTUNREACH	7	/* host unreachable */
63 #define	IMPTYPE_BADDATA		8	/* data error */
64 #define	IMPTYPE_INCOMPLETE	9	/* incomplete message, send rest */
65 #define	IMPTYPE_RESET		10	/* reset complete */
66 /* non-blocking IMP interface */
67 #define	IMPTYPE_RETRY		11	/* IMP refused, try again */
68 #define	IMPTYPE_NOTIFY		12	/* IMP refused, will notify */
69 #define	IMPTYPE_TRYING		13	/* IMP refused, still rexmt'ng */
70 #define	IMPTYPE_READY		14	/* ready for next message */
71 
72 /*
73  * Link numbers
74  */
75 #define	IMPLINK_IP		155
76 #define	IMPLINK_LOWEXPER	156
77 #define	IMPLINK_HIGHEXPER	158
78 
79 /*
80  * IMPTYPE_DOWN subtypes, in link number field.
81  */
82 #define	IMP_DMASK		0x3	/* host going down mask */
83 #define	IMPDOWN_GOING		0	/* 30 secs */
84 #define	IMPDOWN_PM		1	/* hardware PM */
85 #define	IMPDOWN_RELOAD		2	/* software reload */
86 #define	IMPDOWN_RESTART		3	/* emergency restart */
87 #define	IMPDOWN_WHENMASK	0x3c	/* mask for "how soon" */
88 #define	IMPDOWN_WHENSHIFT	2	/* shift for "how soon" */
89 #define	IMPDOWN_WHENUNIT	5	/* unit for "how soon", 5 min. */
90 
91 #define	IMPTV_DOWN	30		/* going down timer 30 secs */
92 
93 #ifdef IMPMESSAGES
94 /*
95  * Messages from IMP regarding why
96  * it's going down.
97  */
98 char *impmessage[] = {
99 	"in 30 seconds",
100 	"for hardware PM",
101 	"to reload software",
102 	"for emergency reset"
103 };
104 #endif
105 
106 /*
107  * IMPTYPE_BADLEADER subtypes.
108  */
109 #define	IMPLEADER_ERR		0	/* error flip-flop set */
110 #define	IMPLEADER_SHORT		1	/* leader < 80 bits */
111 #define	IMPLEADER_TYPE		2	/* illegal type field */
112 #define	IMPLEADER_OPPOSITE	3	/* opposite leader type */
113 
114 /*
115  * IMPTYPE_HOSTDEAD subtypes.
116  */
117 #define	IMPHOST_NORDY		1	/* ready-line negated */
118 #define	IMPHOST_TARDY		2	/* tardy receiving mesgs */
119 #define	IMPHOST_NOEXIST		3	/* NCC doesn't know host */
120 #define	IMPHOST_IMPSOFT		4	/* IMP software won't allow mesgs */
121 #define	IMPHOST_PM		5	/* host down for scheduled PM */
122 #define	IMPHOST_HARDSCHED	6	/* " " " " hardware work */
123 #define	IMPHOST_SOFTSCHED	7	/* " " " " software work */
124 #define	IMPHOST_RESTART		8	/* host down for emergency restart */
125 #define	IMPHOST_POWER		9	/* down because of power outage */
126 #define	IMPHOST_BREAKPOINT	10	/* host stopped at a breakpoint */
127 #define	IMPHOST_HARDWARE	11	/* hardware failure */
128 #define	IMPHOST_NOTUP		12	/* host not scheduled to be up */
129 /* 13-14 currently unused */
130 #define	IMPHOST_COMINGUP	15	/* host in process of coming up */
131 
132 /*
133  * IMPTYPE_HOSTUNREACH subtypes.
134  */
135 #define	IMPREACH_IMP		0	/* destination IMP can't be reached */
136 #define	IMPREACH_HOSTUP		1	/* destination host isn't up */
137 #define	IMPREACH_LEADER		2	/* host doesn't support long leader */
138 #define	IMPREACH_PROHIBITED	3	/* communication is prohibited */
139 
140 /*
141  * IMPTYPE_INCOMPLETE subtypes.
142  */
143 #define	IMPCOMPLETE_SLOW	0	/* host didn't take data fast enough */
144 #define	IMPCOMPLETE_TOOLONG	1	/* message was too long */
145 #define	IMPCOMPLETE_TIMEOUT	2	/* mesg transmission time > 15 sec. */
146 #define	IMPCOMPLETE_FAILURE	3	/* IMP/circuit failure */
147 #define	IMPCOMPLETE_NOSPACE	4	/* no resources within 15 sec. */
148 #define	IMPCOMPLETE_IMPIO	5	/* src IMP I/O failure during receipt */
149 
150 /*
151  * IMPTYPE_RETRY subtypes.
152  */
153 #define	IMPRETRY_BUFFER		0	/* IMP buffer wasn't available */
154 #define	IMPRETRY_BLOCK		1	/* connection block unavailable */
155 
156 #define	RFNMTIMER	(120*PR_SLOWHZ)	 /* time to wait for RFNM for msg. */
157 #define	IMP_OTIMER	(5*IFNET_SLOWHZ) /* max output time unless blocked */
158 
159 /*
160  * Data structure shared between IMP protocol module and hardware
161  * interface driver.  Used to allow layering of IMP routines on top
162  * of varying device drivers.
163  */
164 struct impcb {
165 	int	ic_hwunit;		/* H/W unit number */
166 	char	*ic_hwname;		/* H/W type name */
167 	char	ic_oactive;		/* output in progress */
168 	int	(*ic_init)();		/* hardware init routine */
169 	int	(*ic_output)();		/* hardware output routine */
170 	int	(*ic_down)();		/* hardware "drop ready" routine */
171 };
172 
173 /*
174  * IMP software status per interface.
175  * (partially shared with the hardware specific module)
176  *
177  * Each interface is referenced by a network interface structure,
178  * imp_if, which the routing code uses to locate the interface.
179  * This structure contains the output queue for the interface, its
180  * address, ...  IMP specific structures used in connecting the
181  * IMP software modules to the hardware specific interface routines
182  * are stored here.  The common structures are made visible to the
183  * interface driver by passing a pointer to the hardware routine
184  * at "attach" time.
185  */
186 struct imp_softc {
187 	struct	ifnet imp_if;		/* network visible interface */
188 	struct	impcb imp_cb;		/* hooks to hardware module */
189 	int	imp_state;		/* current state of IMP */
190 	int	imp_dropcnt;		/* used during initialization */
191 	struct	mbuf *imp_hosts;	/* Head of host table hash chains. */
192 	struct	mbuf *imp_hostq;	/* current round-robin-output mark */
193 	u_int	imp_hostent;		/* current round-robin-output mark */
194 	int	imp_msgready;		/* number of messages ready to send */
195 	u_long	imp_block;		/* times imp blocked output */
196 	u_long	imp_lostrfnm;		/* rfnm's timed out */
197 	u_long	imp_badrfnm;		/* rfnm/incompl after timeout/bogus */
198 	u_long	imp_incomplete;		/* incomplete's received */
199 	u_long	imp_garbage;		/* bad messages received */
200 };
201 
202 struct	imp_softc *impattach();
203 
204 /*
205  * State of an IMP.
206  */
207 #define	IMPS_DOWN	0		/* unavailable, host not ready */
208 #define	IMPS_WINIT	1		/* imp not ready, waiting for init */
209 #define	IMPS_INIT	2		/* coming up */
210 #define	IMPS_UP		3		/* ready to go */
211 #define	IMPS_GOINGDOWN	4		/* been told we go down soon */
212 
213 #define	IMPS_RUNNING(s)	((s) >= IMPS_UP)	/* ready for messages */
214 #define	IMPS_IMPREADY(s) ((s) >= IMPS_INIT)	/* IMP ready line on */
215 
216 #ifdef IMPLEADERS
217 char *impleaders[IMPTYPE_READY+1] = {
218 	"DATA", "BADLEADER", "DOWN", "bad", "NOOP", "RFNM", "HOSTDEAD",
219 	"HOSTUNREACH", "BADDATA", "INCOMPLETE", "RESET", "RETRY",
220 	"NOTIFY", "TRYING", "READY"
221 };
222 #endif
223