pdp11v/usr/include/sys/x25.h
/* x25.h 1.12 of 4/14/82
@(#)x25.h 1.12
*/
#define X25LCH 7 /* size of per-link hash table */
#define MAXPKT 1024 /* maximum packet size */
#define HIRECVQ 4 /* high-water mark for slot recvq */
#define LORECVQ 2 /* low-water mark for slot recvq */
#define HIXMTQ 4 /* high-water mark for tab xmtq */
#define LOXMTQ 2 /* low-water mark for tab xmtq */
#define HIL2Q 4 /* high-water mark for Level 2 queue */
#define X25EBQMAX 4 /* max for empty buffer queue */
#define WINDOW 2 /* window size */
#define X25SEQNSZ 8 /* modulo value for seq number range */
#define X25HDRSZ 3 /* length of level 3 packet header */
#define MAXRS 1 /* max for retry counter l_rscount for Ts timer */
#define MAXRL 1 /* max for retry counter t_rlcount for Tl timer */
#define MAXRD 1 /* max for retry counter t_rdcount for Td timer */
#define MAXRJ 1 /* max for retry counter t_rjcount for Tj timer */
#define MAXRC 2 /* max for retry counter l_ccount for changeover */
struct x25info {
int nslots; /* number of slots configured */
int ntabs; /* number of tabs configured */
int nlinks; /* number of links configured */
int nbd; /* number of buffer descriptors configured */
int nxbytes; /* size of buffer area in bytes */
};
/* Layout of items used per link */
struct x25link{
struct x25tab *l_x25chan[X25LCH]; /* array of ptrs to tab structures */
struct x25tab *l_begloq; /* pointer to beginning of low priority queue */
struct x25tab *l_endloq; /* pointer to end of low priority queue */
struct x25tab *l_beghiq; /* pointer to beginning of high priority queue */
struct x25tab *l_endhiq; /* pointer to end of high priority queue */
unsigned short l_pktsz; /* packetsize for the link */
unsigned char l_rststate; /* restart state of link */
unsigned char l_rscount; /* RS counter for TS timer */
unsigned char l_ccount; /* RC counter for TC timer */
struct l_state {
unsigned short devset:1, /* set if primary device attached */
bkset:1, /* set if backup link attached */
rstonl2:1, /* set if RST pkt on Level 2 queue */
l2full:1, /* set if lev 2 q at high-water mark */
l3run:1, /* 1 if level 3 running */
run:1, /* indicates where lev 3 is running */
/* 0:primary, 1:backup */
bkstart:1, /* 1 if backup started by nc driver */
trychg:1, /* set if trying to change over */
statchg:2, /* status of last changeover 0:none, */
/* 1:CHGOCC, 2:CHGFAIL, 3:CHGDEAD */
nchgfails:6; /* number of times changeover failed */
} l_state;
struct l_line {
unsigned short idev; /* csi device index */
char l2sync; /* set if lev 2 synchronized */
unsigned char nl2fails; /* numb of times N2 ctr at max */
short errcode; /* errcode sent from PCD */
} l_line[2];
};
/*
* Layout of items used per logical channel.
* There must be one of these structures assigned for
* each logical channel that may be assigned on a link group.
*/
struct x25tab {
struct csillist t_xmtq; /* transmit queue for data packets */
struct csibd *t_unack[X25SEQNSZ]; /* for unacknowledged packets */
struct x25tab *t_nextab; /* pointer to next tab for hashing */
struct x25tab *t_nexthi; /* pointer to next tab structure on high priority queue */
struct x25tab *t_nextlo; /* pointer to next tab structure on low priority queue */
struct x25slot *t_slotp; /* ptr to slot connected to this tab */
short t_chno; /* logical channel number on link */
unsigned char t_link; /* index of link structure x25link */
unsigned char t_dgnsend; /* diagnostic code for sending RES or RST pkt*/
unsigned char t_dgnrecv; /* diagnostic code for received RES or RST packet */
unsigned char t_rlcount; /* Rl counter for Tl timer */
unsigned char t_rdcount; /* Rd counter for Td timer */
unsigned char t_rjcount; /* Rj counter for Tj timer */
unsigned char t_seqsent; /* bit position set means data with that seqno is being xmitted */
struct {
unsigned short r_ps:3, /* next expected receive P(S) */
s_pr:3, /* last sent value of P(R) */
s_ps:3, /* next send P(S) */
r_pr:3, /* last received value of P(R) */
osdbit:4; /* seq # of unack pkt with Dbit set */
} t_seq;
struct {
unsigned short res:1, /* send reset packet */
resc:1, /* send reset conf packet */
inte:1, /* send interrupt packet */
intc:1, /* send interrupt conf packet */
rnr:1, /* send receiver-not-ready packet */
rr:1, /* send receiver-ready packet */
data:1, /* send data packet */
rej:1, /* send reject packet */
wa:1, /* send window advancement packet - rr,rnr or data */
onhiq:1, /* set if tab is on high priority queue */
onloq:1, /* set if tab is on low priority queue */
rejneed:1, /* need to schedule a REJ pkt */
rejxmit:1, /* transmitted a REJ pkt and have not received DATA with PS=PR */
rejrec:1, /* received REJ & have not sent out DATA with PS = PR */
:2;
} t_flags;
struct t_state {
unsigned short state:4, /* state of channel - R1,R2,R3,D1,D2,D3 */
intstate:2, /* interrupt state within D1 - I2,I3,I4 */
sending:1, /* set if channel can send data */
rcving:1, /* set if channel can receive data */
unconfint:1, /* set if an interrupt is unconfirmed */
delconf:1, /* set if delivery conf is requested */
isreset:1, /* set if chan was just reset */
faropen:1, /* set if far end open */
dbitset:1, /* set when writer sets Dbit */
:3;
} t_state;
};
/* Layout of items used per slot structure */
struct x25slot {
struct csillist s_recvq; /* receive queue */
struct x25tab *s_tabp; /* ptr to tab connected to this slot */
short s_brdcnt; /* num chars read out of buf on header recvq */
struct s_flags {
unsigned short
openrd:1, /* open for reading */
openwr:1, /* open for writing */
wrsleep:1, /* writers should sleep - xmitq full */
messcont:1, /* message will be cont'd next read */
sesspr:2, /* session setup protocol */
excl:1, /* exclusive use */
ndelay:1, /* no delay */
:8;
} s_flags;
};
/* Per-channel timers */
#define TL 0
#define TD 1
#define TF 2
#define TJ 3
#define NTIMER 4
#define ALLTIMER (-1)
/* Per-link timers */
#define TSTIMER 0
#define TCTIMER 1
#define TKTIMER 2
#define TWTIMER 3
#define NLNTIMER 4
/* Timer initial values */
#define TLVAL 60
#define TDVAL 180
#define TFVAL 30
#define TJVAL 40
#define TSVAL 45
#define TCVAL 60
#define TKVAL 30
#define TWVAL 10
/* timer list entry - one for each tab */
struct x25timer {
struct x25timer *tnext;
short chno;
unsigned char tval[NTIMER];
};
/* per link timers */
struct x25lntimer {
unsigned char lntval[NLNTIMER];
};
/* packet types */
#define RST 1
#define RSTC 2
#define RES 3
#define RESC 4
#define INT 5
#define INTC 6
#define RNR 7
#define RR 8
#define WA 9
#define REJ 10
#define DATA 11
#define INV_PKT 12
#define INV_LEN 13
/* channel states */
#define HALTED 0 /* halted state */
#define R1 1 /* flow control ready */
#define R2 2 /* processing restart indication */
#define R3 3 /* awaiting restart confirmation */
#define D1 4 /* data - flow control ready */
#define D2 5 /* processing reset indication */
#define D3 6 /* awaiting reset confirmation */
/* interrupt states within D1 */
#define I1 0 /* not interrupted */
#define I2 1 /* processing interrupt */
#define I3 2 /* awaiting interrupt confirmation */
#define I4 3 /* transmitted/received interrupt */
/* priorities */
#define HI 1
#define LOW 2
#define PR_OK 0
#define PR_OW 1
#define PR_SAME 2
#define PS_OK 0
#define PS_OW 1
#define PRIM 0
#define BKUP 1
#define SETSEQ(BITS, SEQN) (BITS |= (01<<SEQN))
#define UNSETSEQ(BITS, SEQN) (BITS &= ~(01<<SEQN))
#define ISSEQSET(BITS, SEQN) ((BITS>>SEQN)&01)
#ifdef CBUNIX
#define FNDELAY 04
#define FEXCL 0
#endif
#define CHECKRRDY(SLOTP) if (SLOTP->s_recvq.l_ql <= LORECVQ) x25rrdy(SLOTP->s_tabp)
#define X25PRI (PZERO+5)
#define X25HIPRI (PZERO-1)
#define TOBUF 1
#define FROMBUF 2
/* buffer statistics and header statistics */
struct x25m {
int bufused; /* bytes of buffer space used */
int bufwrite; /* bytes used for user write buffers */
int bufrcv; /* bytes of buffer space used for rcv */
int bdused; /* buffer desc. used */
int bdwrite; /* buffer desc. used for user writes */
int bdrcv; /* buffer desc. used for rcv buffers */
int wantbd; /* set if sleeping for buffer space */
};
/* usage for buffer descriptor: rcv data, control packet, xmt data */
#define RCVDBD 0
#define CTLBD 1
#define XMTDBD 2
#ifdef pdp11
#define OCTET1(BDP) BDP->d_octet1
#define OCTET2(BDP) BDP->d_octet2
#define OCTET3(BDP) BDP->d_octet3
#define HDPTR(BDP) (struct level_3 *)&BDP->d_octet1
#define HDROFFSET 0
#else
#define OCTET1(BDP) *BDP->d_adres
#define OCTET2(BDP) *(BDP->d_adres+1)
#define OCTET3(BDP) *(BDP->d_adres+2)
#define HDPTR(BDP) (struct level_3 *)BDP->d_adres
#define HDROFFSET X25HDRSZ
#endif
#define RUNIND linkp->l_state.run
#define STNDIND linkp->l_state.run?0:1
#define NOCHG 0 /* no changeover requested */
#define CHGOCC 1 /* changeover occurred */
#define CHGFAIL 2 /* changeover failed - Lev 2 of standby not sync */
#define CHGDEAD 3 /* changeover failed - Lev 2 of standby dead */
#define RUNDEAD 4 /* arg to x25chnge if changeover must occur */
/* because running line is dead */
#ifdef CBUNIX
#define MINOR(DEV) DEV = minor(DEV)
#else
#define MINOR(DEV)
#endif