1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 31 #ifndef _SYS_STREAM_H 32 #define _SYS_STREAM_H 33 34 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 11.44 */ 35 36 /* 37 * For source compatibility 38 */ 39 #include <sys/isa_defs.h> 40 #include <sys/vnode.h> 41 #include <sys/poll.h> 42 #include <sys/strmdep.h> 43 #include <sys/cred.h> 44 #include <sys/t_lock.h> 45 #include <sys/model.h> 46 47 #ifdef __cplusplus 48 extern "C" { 49 #endif 50 51 /* 52 * Data queue. 53 * 54 * NOTE: The *only* public fields are documented in queue(9S). 55 * Everything else is implementation-private. 56 * 57 * The locking rules for the queue_t structure are extremely subtle and vary 58 * widely depending on the field in question. As such, each field is 59 * annotated according to the following legend: 60 * 61 * Q9S: The field is documented in queue(9S) and may be accessed without 62 * locks by a STREAMS module when inside an entry point (e.g., put(9E)). 63 * However, no fields can be directly modified unless q_lock is held 64 * (which is not possible in a DDI compliant STREAMS module), with the 65 * following exceptions: 66 * 67 * - q_ptr: can be modified as per the rules of the STREAMS module. 68 * The STREAMS framework ignores q_ptr and thus imposes *no* 69 * locking rules on it. 70 * - q_qinfo: can be modified before qprocson(). 71 * 72 * - q_minpsz, q_maxpsz, q_hiwat, q_lowat: can be modified as per the 73 * rules of the STREAMS module. The STREAMS framework never 74 * modifies these fields, and is tolerant of temporarily 75 * stale field values. 76 * 77 * In general, the STREAMS framework employs one of the following 78 * techniques to ensure STREAMS modules can safely access Q9S fields: 79 * 80 * - The field is only modified by the framework when the stream is 81 * locked with strlock() (q_next). 82 * 83 * - The field is modified by the framework, but the modifies are 84 * atomic, and temporarily stale values are harmless (q_count, 85 * q_first, q_last). 86 * 87 * - The field is modified by the framework, but the field's visible 88 * values are either constant or directly under the control 89 * of the STREAMS module itself (q_flag). 90 * 91 * QLK: The field must be accessed or modified under q_lock, except when 92 * the stream has been locked with strlock(). If multiple q_locks must 93 * be acquired, q_locks at higher addresses must be taken first. 94 * 95 * STR: The field can be accessed without a lock, but must be modified under 96 * strlock(). 97 * 98 * SQLK: The field must be accessed or modified under SQLOCK(). 99 * 100 * NOLK: The field can be accessed without a lock, but can only be modified 101 * when the queue_t is not known to any other threads. 102 * 103 * SVLK: The field must be accessed or modified under the service_queue lock. 104 * Note that service_lock must be taken after any needed q_locks, 105 * and that no other lock should be taken while service_lock is held. 106 * 107 * In addition, it is always acceptable to modify a field that is not yet 108 * known to any other threads -- and other special case exceptions exist in 109 * the code. Also, q_lock is used with q_wait to implement a stream head 110 * monitor for reads and writes. 111 */ 112 typedef struct queue { 113 struct qinit *q_qinfo; /* Q9S: Q processing procedure */ 114 struct msgb *q_first; /* Q9S: first message in Q */ 115 struct msgb *q_last; /* Q9S: last message in Q */ 116 struct queue *q_next; /* Q9S: next Q in stream */ 117 struct queue *q_link; /* SVLK: next Q for scheduling */ 118 void *q_ptr; /* Q9S: module-specific data */ 119 size_t q_count; /* Q9S: number of bytes on Q */ 120 uint_t q_flag; /* Q9S: Q state */ 121 ssize_t q_minpsz; /* Q9S: smallest packet OK on Q */ 122 ssize_t q_maxpsz; /* Q9S: largest packet OK on Q */ 123 size_t q_hiwat; /* Q9S: Q high water mark */ 124 size_t q_lowat; /* Q9S: Q low water mark */ 125 struct qband *q_bandp; /* QLK: band flow information */ 126 kmutex_t q_lock; /* NOLK: structure lock */ 127 struct stdata *q_stream; /* NOLK: stream backpointer */ 128 struct syncq *q_syncq; /* NOLK: associated syncq */ 129 unsigned char q_nband; /* QLK: number of bands */ 130 kcondvar_t q_wait; /* NOLK: read/write sleep CV */ 131 struct queue *q_nfsrv; /* STR: next Q with svc routine */ 132 ushort_t q_draining; /* QLK: Q is draining */ 133 short q_struiot; /* QLK: sync streams Q UIO mode */ 134 clock_t q_qtstamp; /* QLK: when Q was enabled */ 135 size_t q_mblkcnt; /* QLK: mblk count */ 136 uint_t q_syncqmsgs; /* QLK: syncq message count */ 137 size_t q_rwcnt; /* QLK: # threads in rwnext() */ 138 pri_t q_spri; /* QLK: Q scheduling priority */ 139 140 /* 141 * Syncq scheduling 142 */ 143 struct msgb *q_sqhead; /* QLK: first syncq message */ 144 struct msgb *q_sqtail; /* QLK: last syncq message */ 145 struct queue *q_sqnext; /* SQLK: next Q on syncq list */ 146 struct queue *q_sqprev; /* SQLK: prev Q on syncq list */ 147 uint_t q_sqflags; /* SQLK: syncq flags */ 148 clock_t q_sqtstamp; /* SQLK: when Q was scheduled for sq */ 149 150 /* 151 * NOLK: Reference to the queue's module's implementation 152 * structure. This will be NULL for queues associated with drivers. 153 */ 154 struct fmodsw_impl *q_fp; 155 } queue_t; 156 157 /* 158 * Queue flags; unused flags not documented in queue(9S) can be recycled. 159 */ 160 #define QENAB 0x00000001 /* Queue is already enabled to run */ 161 #define QWANTR 0x00000002 /* Someone wants to read Q */ 162 #define QWANTW 0x00000004 /* Someone wants to write Q */ 163 #define QFULL 0x00000008 /* Q is considered full */ 164 #define QREADR 0x00000010 /* This is the reader (first) Q */ 165 #define QUSE 0x00000020 /* This queue in use (allocation) */ 166 #define QNOENB 0x00000040 /* Don't enable Q via putq */ 167 #define QWANTRMQSYNC 0x00000080 /* Want to remove sync stream Q */ 168 #define QBACK 0x00000100 /* queue has been back-enabled */ 169 /* UNUSED 0x00000200 was QHLIST */ 170 /* UNUSED 0x00000400 was QUNSAFE */ 171 #define QPAIR 0x00000800 /* per queue-pair syncq */ 172 #define QPERQ 0x00001000 /* per queue-instance syncq */ 173 #define QPERMOD 0x00002000 /* per module syncq */ 174 #define QMTSAFE 0x00004000 /* stream module is MT-safe */ 175 #define QMTOUTPERIM 0x00008000 /* Has outer perimeter */ 176 #define QMT_TYPEMASK (QPAIR|QPERQ|QPERMOD|QMTSAFE|QMTOUTPERIM) 177 /* all MT type flags */ 178 #define QINSERVICE 0x00010000 /* service routine executing */ 179 #define QWCLOSE 0x00020000 /* will not be enabled */ 180 #define QEND 0x00040000 /* last queue in stream */ 181 #define QWANTWSYNC 0x00080000 /* Streamhead wants to write Q */ 182 #define QSYNCSTR 0x00100000 /* Q supports Synchronous STREAMS */ 183 #define QISDRV 0x00200000 /* the Queue is attached to a driver */ 184 /* UNUSED 0x00400000 was QHOT */ 185 /* UNUSED 0x00800000 was QNEXTHOT */ 186 /* UNUSED 0x01000000 was _QNEXTLESS */ 187 #define _QINSERTING 0x04000000 /* Private, module is being inserted */ 188 #define _QREMOVING 0x08000000 /* Private, module is being removed */ 189 #define _QASSOCIATED 0x10000000 /* queue is associated with a device */ 190 #define _QDIRECT 0x20000000 /* Private; transport module uses */ 191 /* direct interface to/from sockfs */ 192 193 /* queue sqflags (protected by SQLOCK). */ 194 #define Q_SQQUEUED 0x01 /* Queue is in the syncq list */ 195 #define Q_SQDRAINING 0x02 /* Servicing syncq msgs. */ 196 /* This is also noted by the */ 197 /* q_draining field, but this one is */ 198 /* protected by SQLOCK */ 199 200 /* 201 * Structure that describes the separate information 202 * for each priority band in the queue. 203 */ 204 typedef struct qband { 205 struct qband *qb_next; /* next band's info */ 206 size_t qb_count; /* number of bytes in band */ 207 struct msgb *qb_first; /* beginning of band's data */ 208 struct msgb *qb_last; /* end of band's data */ 209 size_t qb_hiwat; /* high water mark for band */ 210 size_t qb_lowat; /* low water mark for band */ 211 uint_t qb_flag; /* see below */ 212 size_t qb_mblkcnt; /* mblk counter for runaway msgs */ 213 } qband_t; 214 215 /* 216 * qband flags 217 */ 218 #define QB_FULL 0x01 /* band is considered full */ 219 #define QB_WANTW 0x02 /* Someone wants to write to band */ 220 #define QB_BACK 0x04 /* queue has been back-enabled */ 221 222 /* 223 * Maximum number of bands. 224 */ 225 #define NBAND 256 226 227 /* 228 * Fields that can be manipulated through strqset() and strqget(). 229 */ 230 typedef enum qfields { 231 QHIWAT = 0, /* q_hiwat or qb_hiwat */ 232 QLOWAT = 1, /* q_lowat or qb_lowat */ 233 QMAXPSZ = 2, /* q_maxpsz */ 234 QMINPSZ = 3, /* q_minpsz */ 235 QCOUNT = 4, /* q_count or qb_count */ 236 QFIRST = 5, /* q_first or qb_first */ 237 QLAST = 6, /* q_last or qb_last */ 238 QFLAG = 7, /* q_flag or qb_flag */ 239 QSTRUIOT = 8, /* q_struiot */ 240 QBAD = 9 241 } qfields_t; 242 243 /* 244 * Module information structure 245 */ 246 struct module_info { 247 ushort_t mi_idnum; /* module id number */ 248 char *mi_idname; /* module name */ 249 ssize_t mi_minpsz; /* min packet size accepted */ 250 ssize_t mi_maxpsz; /* max packet size accepted */ 251 size_t mi_hiwat; /* hi-water mark */ 252 size_t mi_lowat; /* lo-water mark */ 253 }; 254 255 /* 256 * queue information structure (with Synchronous STREAMS extensions) 257 */ 258 struct qinit { 259 int (*qi_putp)(); /* put procedure */ 260 int (*qi_srvp)(); /* service procedure */ 261 int (*qi_qopen)(); /* called on startup */ 262 int (*qi_qclose)(); /* called on finish */ 263 int (*qi_qadmin)(); /* for future use */ 264 struct module_info *qi_minfo; /* module information structure */ 265 struct module_stat *qi_mstat; /* module statistics structure */ 266 int (*qi_rwp)(); /* r/w procedure */ 267 int (*qi_infop)(); /* information procedure */ 268 int qi_struiot; /* stream uio type for struio() */ 269 }; 270 271 /* 272 * Values for qi_struiot and q_struiot: 273 */ 274 #define STRUIOT_NONE -1 /* doesn't support struio() */ 275 #define STRUIOT_DONTCARE 0 /* use current uiomove() (default) */ 276 #define STRUIOT_STANDARD 1 /* use standard uiomove() */ 277 278 /* 279 * Streamtab (used in cdevsw and fmodsw to point to module or driver) 280 */ 281 struct streamtab { 282 struct qinit *st_rdinit; 283 struct qinit *st_wrinit; 284 struct qinit *st_muxrinit; 285 struct qinit *st_muxwinit; 286 }; 287 288 /* 289 * Structure sent to mux drivers to indicate a link. 290 */ 291 struct linkblk { 292 queue_t *l_qtop; /* lowest level write queue of upper stream */ 293 /* (set to NULL for persistent links) */ 294 queue_t *l_qbot; /* highest level write queue of lower stream */ 295 int l_index; /* index for lower stream. */ 296 }; 297 298 /* 299 * Esballoc data buffer freeing routine 300 */ 301 typedef struct free_rtn { 302 void (*free_func)(); 303 caddr_t free_arg; 304 } frtn_t; 305 306 /* 307 * Data block descriptor 308 * 309 * NOTE: db_base, db_lim, db_ref and db_type are the *only* public fields, 310 * as described in datab(9S). Everything else is implementation-private. 311 */ 312 313 #define DBLK_REFMAX 255U 314 315 typedef struct datab { 316 frtn_t *db_frtnp; 317 unsigned char *db_base; 318 unsigned char *db_lim; 319 unsigned char db_ref; 320 unsigned char db_type; 321 unsigned char db_flags; 322 unsigned char db_struioflag; 323 pid_t db_cpid; /* cached pid, needs verification */ 324 void *db_cache; /* kmem cache descriptor */ 325 struct msgb *db_mblk; 326 void (*db_free)(struct msgb *, struct datab *); 327 void (*db_lastfree)(struct msgb *, struct datab *); 328 intptr_t db_cksumstart; 329 intptr_t db_cksumend; 330 intptr_t db_cksumstuff; 331 union { 332 double enforce_alignment; 333 unsigned char data[8]; 334 struct { 335 union { 336 uint32_t u32; 337 uint16_t u16; 338 } cksum_val; /* used to store calculated cksum */ 339 uint16_t flags; 340 uint16_t pad; 341 } cksum; 342 /* 343 * Union used for future extensions (pointer to data ?). 344 */ 345 } db_struioun; 346 struct fthdr *db_fthdr; 347 cred_t *db_credp; /* credential */ 348 } dblk_t; 349 350 #define db_cksum16 db_struioun.cksum.cksum_val.u16 351 #define db_cksum32 db_struioun.cksum.cksum_val.u32 352 353 /* 354 * Accessor macros for private dblk_t fields (the rest are in <sys/strsun.h>). 355 */ 356 #define DB_CPID(mp) ((mp)->b_datap->db_cpid) 357 #define DB_CRED(mp) ((mp)->b_datap->db_credp) 358 #define DB_CREDDEF(mp, cr) (DB_CRED(mp) != NULL ? DB_CRED(mp) : (cr)) 359 #define DB_FTHDR(mp) ((mp)->b_datap->db_fthdr) 360 361 /* 362 * Message block descriptor 363 */ 364 typedef struct msgb { 365 struct msgb *b_next; 366 struct msgb *b_prev; 367 struct msgb *b_cont; 368 unsigned char *b_rptr; 369 unsigned char *b_wptr; 370 struct datab *b_datap; 371 unsigned char b_band; 372 unsigned char b_tag; 373 unsigned short b_flag; 374 queue_t *b_queue; /* for sync queues */ 375 } mblk_t; 376 377 /* 378 * bcache descriptor 379 */ 380 typedef struct bcache { 381 kmutex_t mutex; 382 struct kmem_cache *buffer_cache; 383 struct kmem_cache *dblk_cache; 384 int alloc; 385 int destroy; 386 size_t size; 387 uint_t align; 388 } bcache_t; 389 390 /* 391 * db_flags values (all implementation private!) 392 */ 393 #define DBLK_REFMIN 0x01 /* min refcnt stored in low bit */ 394 #define DBLK_COOKED 0x02 /* message has been processed once */ 395 396 /* 397 * db_struioflag values: 398 */ 399 #define STRUIO_SPEC 0x01 /* struio{get,put}() special mblk */ 400 #define STRUIO_DONE 0x02 /* struio done (could be partial) */ 401 #define STRUIO_IP 0x04 /* IP checksum stored in db_struioun */ 402 #define STRUIO_ZC 0x08 /* mblk eligible for zero-copy */ 403 #define STRUIO_ZCNOTIFY 0x10 /* notify stream head when mblk acked */ 404 #define STRUIO_EAGER 0x20 /* new eager; db_cksumstart has squeue to use */ 405 #define STRUIO_POLICY 0x40 /* new eager when IPsec is enabled */ 406 407 /* 408 * Message flags. These are interpreted by the stream head. 409 */ 410 #define MSGMARK 0x01 /* last byte of message is "marked" */ 411 #define MSGNOLOOP 0x02 /* don't loop message around to */ 412 /* write side of stream */ 413 #define MSGDELIM 0x04 /* message is delimited */ 414 /* UNUSED 0x08 was MSGNOGET (can be recycled) */ 415 #define MSGMARKNEXT 0x10 /* Private: first byte of next msg marked */ 416 #define MSGNOTMARKNEXT 0x20 /* Private: ... not marked */ 417 #define MSGHASREF 0x40 /* Private: message has reference to owner */ 418 419 /* 420 * Streams message types. 421 */ 422 423 /* 424 * Data and protocol messages (regular and priority) 425 */ 426 #define M_DATA 0x00 /* regular data */ 427 #define M_PROTO 0x01 /* protocol control */ 428 #define M_MULTIDATA 0x02 /* reserved for Multidata use only */ 429 430 /* 431 * Control messages (regular and priority) 432 */ 433 #define M_BREAK 0x08 /* line break */ 434 #define M_PASSFP 0x09 /* pass file pointer */ 435 #define M_EVENT 0x0a /* Obsoleted: do not use */ 436 #define M_SIG 0x0b /* generate process signal */ 437 #define M_DELAY 0x0c /* real-time xmit delay (1 param) */ 438 #define M_CTL 0x0d /* device-specific control message */ 439 #define M_IOCTL 0x0e /* ioctl; set/get params */ 440 #define M_SETOPTS 0x10 /* set various stream head options */ 441 #define M_RSE 0x11 /* reserved for RSE use only */ 442 443 /* 444 * Control messages (high priority; go to head of queue) 445 */ 446 #define M_IOCACK 0x81 /* acknowledge ioctl */ 447 #define M_IOCNAK 0x82 /* negative ioctl acknowledge */ 448 #define M_PCPROTO 0x83 /* priority proto message */ 449 #define M_PCSIG 0x84 /* generate process signal */ 450 #define M_READ 0x85 /* generate read notification */ 451 #define M_FLUSH 0x86 /* flush your queues */ 452 #define M_STOP 0x87 /* stop transmission immediately */ 453 #define M_START 0x88 /* restart transmission after stop */ 454 #define M_HANGUP 0x89 /* line disconnect */ 455 #define M_ERROR 0x8a /* send error to stream head */ 456 #define M_COPYIN 0x8b /* request to copyin data */ 457 #define M_COPYOUT 0x8c /* request to copyout data */ 458 #define M_IOCDATA 0x8d /* response to M_COPYIN and M_COPYOUT */ 459 #define M_PCRSE 0x8e /* reserved for RSE use only */ 460 #define M_STOPI 0x8f /* stop reception immediately */ 461 #define M_STARTI 0x90 /* restart reception after stop */ 462 #define M_PCEVENT 0x91 /* Obsoleted: do not use */ 463 #define M_UNHANGUP 0x92 /* line reconnect, sigh */ 464 465 /* 466 * Queue message class definitions. 467 */ 468 #define QNORM 0x00 /* normal priority messages */ 469 #define QPCTL 0x80 /* high priority cntrl messages */ 470 471 /* 472 * IOCTL structure - this structure is the format of the M_IOCTL message type. 473 */ 474 #if defined(_LP64) 475 struct iocblk { 476 int ioc_cmd; /* ioctl command type */ 477 cred_t *ioc_cr; /* full credentials */ 478 uint_t ioc_id; /* ioctl id */ 479 uint_t ioc_flag; /* see below */ 480 size_t ioc_count; /* count of bytes in data field */ 481 int ioc_rval; /* return value */ 482 int ioc_error; /* error code */ 483 }; 484 #else 485 struct iocblk { 486 int ioc_cmd; /* ioctl command type */ 487 cred_t *ioc_cr; /* full credentials */ 488 uint_t ioc_id; /* ioctl id */ 489 size_t ioc_count; /* count of bytes in data field */ 490 int ioc_error; /* error code */ 491 int ioc_rval; /* return value */ 492 int ioc_fill1; 493 uint_t ioc_flag; /* see below */ 494 int ioc_filler[2]; /* reserved for future use */ 495 }; 496 #endif /* _LP64 */ 497 498 typedef struct iocblk *IOCP; 499 500 /* {ioc,cp}_flags values */ 501 502 #define IOC_MODELS DATAMODEL_MASK /* Note: 0x0FF00000 */ 503 #define IOC_ILP32 DATAMODEL_ILP32 /* ioctl origin is ILP32 */ 504 #define IOC_LP64 DATAMODEL_LP64 /* ioctl origin is LP64 */ 505 #define IOC_NATIVE DATAMODEL_NATIVE 506 #define IOC_NONE DATAMODEL_NONE /* dummy comparison value */ 507 508 /* 509 * Is the ioctl data formatted for our native model? 510 */ 511 #define IOC_CONVERT_FROM(iocp) ddi_model_convert_from( \ 512 ((struct iocblk *)iocp)->ioc_flag) 513 514 /* 515 * structure for the M_COPYIN and M_COPYOUT message types. 516 */ 517 #if defined(_LP64) 518 struct copyreq { 519 int cq_cmd; /* ioctl command (from ioc_cmd) */ 520 cred_t *cq_cr; /* full credentials (from ioc_cmd) */ 521 uint_t cq_id; /* ioctl id (from ioc_id) */ 522 uint_t cq_flag; /* must be zero */ 523 mblk_t *cq_private; /* private state information */ 524 caddr_t cq_addr; /* address to copy data to/from */ 525 size_t cq_size; /* number of bytes to copy */ 526 }; 527 #else 528 struct copyreq { 529 int cq_cmd; /* ioctl command (from ioc_cmd) */ 530 cred_t *cq_cr; /* full credentials */ 531 uint_t cq_id; /* ioctl id (from ioc_id) */ 532 caddr_t cq_addr; /* address to copy data to/from */ 533 size_t cq_size; /* number of bytes to copy */ 534 uint_t cq_flag; /* must be zero */ 535 mblk_t *cq_private; /* private state information */ 536 int cq_filler[4]; /* reserved for future use */ 537 }; 538 #endif /* _LP64 */ 539 540 /* 541 * structure for the M_IOCDATA message type. 542 */ 543 #if defined(_LP64) 544 struct copyresp { 545 int cp_cmd; /* ioctl command (from ioc_cmd) */ 546 cred_t *cp_cr; /* full credentials (from ioc_cmd) */ 547 uint_t cp_id; /* ioctl id (from ioc_id) */ 548 uint_t cp_flag; /* datamodel IOC_ flags; see above */ 549 mblk_t *cp_private; /* private state information */ 550 caddr_t cp_rval; /* status of request: 0 -> success */ 551 /* non-zero -> failure */ 552 }; 553 #else 554 struct copyresp { 555 int cp_cmd; /* ioctl command (from ioc_cmd) */ 556 cred_t *cp_cr; /* full credentials */ 557 uint_t cp_id; /* ioctl id (from ioc_id) */ 558 caddr_t cp_rval; /* status of request: 0 -> success */ 559 /* non-zero -> failure */ 560 size_t cp_pad1; 561 uint_t cp_pad2; 562 mblk_t *cp_private; /* private state information */ 563 uint_t cp_flag; /* datamodel IOC_ flags; see above */ 564 int cp_filler[3]; 565 }; 566 #endif /* _LP64 */ 567 568 /* 569 * Since these structures are all intended to travel in the same message 570 * at different stages of a STREAMS ioctl, this union is used to determine 571 * the message size in strdoioctl(). 572 */ 573 union ioctypes { 574 struct iocblk iocblk; 575 struct copyreq copyreq; 576 struct copyresp copyresp; 577 }; 578 579 /* 580 * Options structure for M_SETOPTS message. This is sent upstream 581 * by a module or driver to set stream head options. 582 */ 583 584 struct stroptions { 585 uint_t so_flags; /* options to set */ 586 short so_readopt; /* read option */ 587 ushort_t so_wroff; /* write offset */ 588 ssize_t so_minpsz; /* minimum read packet size */ 589 ssize_t so_maxpsz; /* maximum read packet size */ 590 size_t so_hiwat; /* read queue high water mark */ 591 size_t so_lowat; /* read queue low water mark */ 592 unsigned char so_band; /* band for water marks */ 593 ushort_t so_erropt; /* error option */ 594 ssize_t so_maxblk; /* maximum message block size */ 595 ushort_t so_copyopt; /* copy options (see stropts.h) */ 596 ushort_t so_tail; /* space available at the end */ 597 }; 598 599 /* flags for stream options set message */ 600 601 #define SO_ALL 0x003f /* set all old options */ 602 #define SO_READOPT 0x0001 /* set read option */ 603 #define SO_WROFF 0x0002 /* set write offset */ 604 #define SO_MINPSZ 0x0004 /* set min packet size */ 605 #define SO_MAXPSZ 0x0008 /* set max packet size */ 606 #define SO_HIWAT 0x0010 /* set high water mark */ 607 #define SO_LOWAT 0x0020 /* set low water mark */ 608 #define SO_MREADON 0x0040 /* set read notification ON */ 609 #define SO_MREADOFF 0x0080 /* set read notification OFF */ 610 #define SO_NDELON 0x0100 /* old TTY semantics for NDELAY reads/writes */ 611 #define SO_NDELOFF 0x0200 /* STREAMS semantics for NDELAY reads/writes */ 612 #define SO_ISTTY 0x0400 /* the stream is acting as a terminal */ 613 #define SO_ISNTTY 0x0800 /* the stream is not acting as a terminal */ 614 #define SO_TOSTOP 0x1000 /* stop on background writes to this stream */ 615 #define SO_TONSTOP 0x2000 /* do not stop on background writes to stream */ 616 #define SO_BAND 0x4000 /* water marks affect band */ 617 #define SO_DELIM 0x8000 /* messages are delimited */ 618 #define SO_NODELIM 0x010000 /* turn off delimiters */ 619 #define SO_STRHOLD 0x020000 /* No longer implemented */ 620 #define SO_ERROPT 0x040000 /* set error option */ 621 #define SO_COPYOPT 0x080000 /* copy option(s) present */ 622 #define SO_MAXBLK 0x100000 /* set maximum message block size */ 623 #define SO_TAIL 0x200000 /* set the extra allocated space */ 624 625 #ifdef _KERNEL 626 /* 627 * Structure for rw (read/write) procedure calls. A pointer 628 * to a struiod_t is passed as a parameter to the rwnext() call. 629 * 630 * Note: DEF_IOV_MAX is defined and used as it is in "fs/vncalls.c" 631 * as there isn't a formal definition of IOV_MAX ??? 632 */ 633 #define DEF_IOV_MAX 16 634 635 typedef struct struiod { 636 mblk_t *d_mp; /* pointer to mblk (chain) */ 637 uio_t d_uio; /* uio info */ 638 iovec_t d_iov[DEF_IOV_MAX]; /* iov referenced by uio */ 639 } struiod_t; 640 641 /* 642 * Structure for information procedure calls. 643 */ 644 typedef struct infod { 645 unsigned char d_cmd; /* info info request command */ 646 unsigned char d_res; /* info info command results */ 647 int d_bytes; /* mblk(s) byte count */ 648 int d_count; /* count of mblk(s) */ 649 uio_t *d_uiop; /* pointer to uio struct */ 650 } infod_t; 651 /* 652 * Values for d_cmd & d_res. 653 */ 654 #define INFOD_FIRSTBYTES 0x02 /* return msgbsize() of first mblk */ 655 #define INFOD_BYTES 0x04 /* return msgbsize() of all mblk(s) */ 656 #define INFOD_COUNT 0x08 /* return count of mblk(s) */ 657 #define INFOD_COPYOUT 0x10 /* copyout any M_DATA mblk(s) */ 658 659 #endif /* _KERNEL */ 660 661 /* 662 * Miscellaneous parameters and flags. 663 */ 664 665 /* 666 * Values for stream flag in open to indicate module open, clone open, 667 * and the return value for failure. 668 */ 669 #define MODOPEN 0x1 /* open as a module */ 670 #define CLONEOPEN 0x2 /* clone open; pick own minor dev */ 671 #define OPENFAIL -1 /* returned for open failure */ 672 673 /* 674 * Priority definitions for block allocation. 675 */ 676 #define BPRI_LO 1 677 #define BPRI_MED 2 678 #define BPRI_HI 3 679 680 /* 681 * Value for packet size that denotes infinity 682 */ 683 #define INFPSZ -1 684 685 /* 686 * Flags for flushq() 687 */ 688 #define FLUSHALL 1 /* flush all messages */ 689 #define FLUSHDATA 0 /* don't flush control messages */ 690 691 /* 692 * Flag for transparent ioctls 693 */ 694 #define TRANSPARENT (unsigned int)(-1) 695 696 /* 697 * Stream head default high/low water marks 698 */ 699 #define STRHIGH 5120 700 #define STRLOW 1024 701 702 /* 703 * Block allocation parameters 704 */ 705 #define MAXIOCBSZ 1024 /* max ioctl data block size */ 706 707 /* 708 * qwriter perimeter types 709 */ 710 #define PERIM_INNER 1 /* The inner perimeter */ 711 #define PERIM_OUTER 2 /* The outer perimeter */ 712 713 /* 714 * Definitions of Streams macros and function interfaces. 715 */ 716 717 /* 718 * canenable - check if queue can be enabled by putq(). 719 */ 720 #define canenable(q) !((q)->q_flag & QNOENB) 721 722 /* 723 * Test if data block type is one of the data messages (i.e. not a control 724 * message). 725 */ 726 #define datamsg(type) \ 727 ((type) == M_DATA || \ 728 (type) == M_MULTIDATA || \ 729 (type) == M_PROTO || \ 730 (type) == M_PCPROTO || \ 731 (type) == M_DELAY) 732 733 /* 734 * Extract queue class of message block. 735 */ 736 #define queclass(bp) (((bp)->b_datap->db_type >= QPCTL) ? QPCTL : QNORM) 737 738 /* 739 * Align address on next lower word boundary. 740 */ 741 #define straln(a) (caddr_t)((intptr_t)(a) & -(sizeof (int)-1)) 742 743 /* 744 * Find the max size of data block. 745 */ 746 #define bpsize(bp) ((unsigned int)(bp->b_datap->db_lim - bp->b_datap->db_base)) 747 748 #ifdef _KERNEL 749 750 /* 751 * For two-byte M_ERROR messages: indication that a side does not have an error 752 */ 753 #define NOERROR ((unsigned char)-1) 754 755 /* 756 * declarations of common routines 757 */ 758 759 extern mblk_t *allocb(size_t, uint_t); 760 extern mblk_t *desballoc(unsigned char *, size_t, uint_t, frtn_t *); 761 extern mblk_t *esballoc(unsigned char *, size_t, uint_t, frtn_t *); 762 extern bcache_t *bcache_create(char *, size_t, uint_t); 763 extern void bcache_destroy(bcache_t *); 764 extern mblk_t *bcache_allocb(bcache_t *, uint_t); 765 extern mblk_t *mkiocb(uint_t); 766 extern int testb(size_t, uint_t); 767 extern bufcall_id_t bufcall(size_t, uint_t, void (*)(void *), void *); 768 extern bufcall_id_t esbbcall(uint_t, void (*)(void *), void *); 769 extern void freeb(struct msgb *); 770 extern void freemsg(mblk_t *); 771 extern mblk_t *dupb(mblk_t *); 772 extern mblk_t *dupmsg(mblk_t *); 773 extern mblk_t *dupmsg_noloan(mblk_t *); 774 extern mblk_t *copyb(mblk_t *); 775 extern mblk_t *copymsg(mblk_t *); 776 extern void linkb(mblk_t *, mblk_t *); 777 extern mblk_t *unlinkb(mblk_t *); 778 extern mblk_t *reallocb(mblk_t *, size_t, uint_t); /* private */ 779 extern mblk_t *rmvb(mblk_t *, mblk_t *); 780 extern int pullupmsg(struct msgb *, ssize_t); 781 extern mblk_t *msgpullup(struct msgb *, ssize_t); 782 extern int adjmsg(struct msgb *, ssize_t); 783 extern size_t msgdsize(struct msgb *); 784 extern mblk_t *getq(queue_t *); 785 extern void rmvq(queue_t *, mblk_t *); 786 extern void flushq(queue_t *, int); 787 extern void flushq_common(queue_t *, int, int); 788 extern void flushband(queue_t *, unsigned char, int); 789 extern int canput(queue_t *); 790 extern int bcanput(queue_t *, unsigned char); 791 extern int canputnext(queue_t *); 792 extern int bcanputnext(queue_t *, unsigned char); 793 extern int putq(queue_t *, mblk_t *); 794 extern int putbq(queue_t *, mblk_t *); 795 extern int insq(queue_t *, mblk_t *, mblk_t *); 796 extern void put(queue_t *, mblk_t *); 797 extern void putnext(queue_t *, mblk_t *); 798 extern int putctl(queue_t *, int); 799 extern int putctl1(queue_t *, int, int); 800 extern int putnextctl(queue_t *, int); 801 extern int putnextctl1(queue_t *, int, int); 802 extern queue_t *backq(queue_t *); 803 extern void qreply(queue_t *, mblk_t *); 804 extern void qenable(queue_t *); 805 extern int qsize(queue_t *); 806 extern void noenable(queue_t *); 807 extern void enableok(queue_t *); 808 extern int strqset(queue_t *, qfields_t, unsigned char, intptr_t); 809 extern int strqget(queue_t *, qfields_t, unsigned char, void *); 810 extern void unbufcall(bufcall_id_t); 811 extern void qprocson(queue_t *); 812 extern void qprocsoff(queue_t *); 813 extern void freezestr(queue_t *); 814 extern void unfreezestr(queue_t *); 815 extern void qwait(queue_t *); 816 extern int qwait_sig(queue_t *); 817 extern boolean_t qwait_rw(queue_t *); 818 extern void qwriter(queue_t *, mblk_t *, void (*func)(), int); 819 extern timeout_id_t qtimeout(queue_t *, void (*func)(void *), void *, clock_t); 820 extern bufcall_id_t qbufcall(queue_t *, size_t, uint_t, 821 void (*)(void *), void *); 822 extern clock_t quntimeout(queue_t *, timeout_id_t); 823 extern void qunbufcall(queue_t *, bufcall_id_t); 824 extern void strwakeq(queue_t *, int); 825 extern int struioget(queue_t *, mblk_t *, struiod_t *, int); 826 extern int rwnext(queue_t *, struiod_t *); 827 extern int infonext(queue_t *, infod_t *); 828 extern int isuioq(queue_t *); 829 extern void create_putlocks(queue_t *, int); 830 831 /* 832 * shared or externally configured data structures 833 */ 834 extern int nstrpush; /* maximum number of pushes allowed */ 835 836 #endif /* _KERNEL */ 837 838 #ifdef __cplusplus 839 } 840 #endif 841 842 #endif /* _SYS_STREAM_H */ 843