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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 27 /* All Rights Reserved */ 28 29 30 #ifndef _SYS_STREAM_H 31 #define _SYS_STREAM_H 32 33 /* 34 * For source compatibility 35 */ 36 #include <sys/isa_defs.h> 37 #ifdef _KERNEL 38 #include <sys/vnode.h> 39 #endif 40 #include <sys/poll.h> 41 #include <sys/strmdep.h> 42 #include <sys/cred.h> 43 #include <sys/t_lock.h> 44 #include <sys/model.h> 45 46 #ifdef __cplusplus 47 extern "C" { 48 #endif 49 50 /* 51 * Data queue. 52 * 53 * NOTE: The *only* public fields are documented in queue(9S). 54 * Everything else is implementation-private. 55 * 56 * The locking rules for the queue_t structure are extremely subtle and vary 57 * widely depending on the field in question. As such, each field is 58 * annotated according to the following legend: 59 * 60 * Q9S: The field is documented in queue(9S) and may be accessed without 61 * locks by a STREAMS module when inside an entry point (e.g., put(9E)). 62 * However, no fields can be directly modified unless q_lock is held 63 * (which is not possible in a DDI compliant STREAMS module), with the 64 * following exceptions: 65 * 66 * - q_ptr: can be modified as per the rules of the STREAMS module. 67 * The STREAMS framework ignores q_ptr and thus imposes *no* 68 * locking rules on it. 69 * - q_qinfo: can be modified before qprocson(). 70 * 71 * - q_minpsz, q_maxpsz, q_hiwat, q_lowat: can be modified as per the 72 * rules of the STREAMS module. The STREAMS framework never 73 * modifies these fields, and is tolerant of temporarily 74 * stale field values. 75 * 76 * In general, the STREAMS framework employs one of the following 77 * techniques to ensure STREAMS modules can safely access Q9S fields: 78 * 79 * - The field is only modified by the framework when the stream is 80 * locked with strlock() (q_next). 81 * 82 * - The field is modified by the framework, but the modifies are 83 * atomic, and temporarily stale values are harmless (q_count, 84 * q_first, q_last). 85 * 86 * - The field is modified by the framework, but the field's visible 87 * values are either constant or directly under the control 88 * of the STREAMS module itself (q_flag). 89 * 90 * QLK: The field must be accessed or modified under q_lock, except when 91 * the stream has been locked with strlock(). If multiple q_locks must 92 * be acquired, q_locks at higher addresses must be taken first. 93 * 94 * STR: The field can be accessed without a lock, but must be modified under 95 * strlock(). 96 * 97 * SQLK: The field must be accessed or modified under SQLOCK(). 98 * 99 * NOLK: The field can be accessed without a lock, but can only be modified 100 * when the queue_t is not known to any other threads. 101 * 102 * SVLK: The field must be accessed or modified under the service_queue lock. 103 * Note that service_lock must be taken after any needed q_locks, 104 * and that no other lock should be taken while service_lock is held. 105 * 106 * In addition, it is always acceptable to modify a field that is not yet 107 * known to any other threads -- and other special case exceptions exist in 108 * the code. Also, q_lock is used with q_wait to implement a stream head 109 * monitor for reads and writes. 110 */ 111 typedef struct queue { 112 struct qinit *q_qinfo; /* Q9S: Q processing procedure */ 113 struct msgb *q_first; /* Q9S: first message in Q */ 114 struct msgb *q_last; /* Q9S: last message in Q */ 115 struct queue *q_next; /* Q9S: next Q in stream */ 116 struct queue *q_link; /* SVLK: next Q for scheduling */ 117 void *q_ptr; /* Q9S: module-specific data */ 118 size_t q_count; /* Q9S: number of bytes on Q */ 119 uint_t q_flag; /* Q9S: Q state */ 120 ssize_t q_minpsz; /* Q9S: smallest packet OK on Q */ 121 ssize_t q_maxpsz; /* Q9S: largest packet OK on Q */ 122 size_t q_hiwat; /* Q9S: Q high water mark */ 123 size_t q_lowat; /* Q9S: Q low water mark */ 124 struct qband *q_bandp; /* QLK: band flow information */ 125 kmutex_t q_lock; /* NOLK: structure lock */ 126 struct stdata *q_stream; /* NOLK: stream backpointer */ 127 struct syncq *q_syncq; /* NOLK: associated syncq */ 128 unsigned char q_nband; /* QLK: number of bands */ 129 kcondvar_t q_wait; /* NOLK: read/write sleep CV */ 130 struct queue *q_nfsrv; /* STR: next Q with svc routine */ 131 ushort_t q_draining; /* QLK: Q is draining */ 132 short q_struiot; /* QLK: sync streams Q UIO mode */ 133 clock_t q_qtstamp; /* QLK: when Q was enabled */ 134 size_t q_mblkcnt; /* QLK: mblk count */ 135 uint_t q_syncqmsgs; /* QLK: syncq message count */ 136 size_t q_rwcnt; /* QLK: # threads in rwnext() */ 137 pri_t q_spri; /* QLK: Q scheduling priority */ 138 139 /* 140 * Syncq scheduling 141 */ 142 struct msgb *q_sqhead; /* QLK: first syncq message */ 143 struct msgb *q_sqtail; /* QLK: last syncq message */ 144 struct queue *q_sqnext; /* SQLK: next Q on syncq list */ 145 struct queue *q_sqprev; /* SQLK: prev Q on syncq list */ 146 uint_t q_sqflags; /* SQLK: syncq flags */ 147 clock_t q_sqtstamp; /* SQLK: when Q was scheduled for sq */ 148 149 /* 150 * NOLK: Reference to the queue's module's implementation 151 * structure. This will be NULL for queues associated with drivers. 152 */ 153 struct fmodsw_impl *q_fp; 154 } queue_t; 155 156 /* 157 * Queue flags; unused flags not documented in queue(9S) can be recycled. 158 */ 159 #define QENAB 0x00000001 /* Queue is already enabled to run */ 160 #define QWANTR 0x00000002 /* Someone wants to read Q */ 161 #define QWANTW 0x00000004 /* Someone wants to write Q */ 162 #define QFULL 0x00000008 /* Q is considered full */ 163 #define QREADR 0x00000010 /* This is the reader (first) Q */ 164 #define QUSE 0x00000020 /* This queue in use (allocation) */ 165 #define QNOENB 0x00000040 /* Don't enable Q via putq */ 166 #define QWANTRMQSYNC 0x00000080 /* Want to remove sync stream Q */ 167 #define QBACK 0x00000100 /* queue has been back-enabled */ 168 /* UNUSED 0x00000200 was QHLIST */ 169 /* UNUSED 0x00000400 was QUNSAFE */ 170 #define QPAIR 0x00000800 /* per queue-pair syncq */ 171 #define QPERQ 0x00001000 /* per queue-instance syncq */ 172 #define QPERMOD 0x00002000 /* per module syncq */ 173 #define QMTSAFE 0x00004000 /* stream module is MT-safe */ 174 #define QMTOUTPERIM 0x00008000 /* Has outer perimeter */ 175 #define QMT_TYPEMASK (QPAIR|QPERQ|QPERMOD|QMTSAFE|QMTOUTPERIM) 176 /* all MT type flags */ 177 #define QINSERVICE 0x00010000 /* service routine executing */ 178 #define QWCLOSE 0x00020000 /* will not be enabled */ 179 #define QEND 0x00040000 /* last queue in stream */ 180 #define QWANTWSYNC 0x00080000 /* Streamhead wants to write Q */ 181 #define QSYNCSTR 0x00100000 /* Q supports Synchronous STREAMS */ 182 #define QISDRV 0x00200000 /* the Queue is attached to a driver */ 183 /* UNUSED 0x00400000 was QHOT */ 184 /* UNUSED 0x00800000 was QNEXTHOT */ 185 /* UNUSED 0x01000000 was _QNEXTLESS */ 186 #define _QINSERTING 0x04000000 /* Private, module is being inserted */ 187 #define _QREMOVING 0x08000000 /* Private, module is being removed */ 188 #define _QASSOCIATED 0x10000000 /* queue is associated with a device */ 189 #define _QDIRECT 0x20000000 /* Private; transport module uses */ 190 /* direct interface to/from sockfs */ 191 #define _QSODIRECT 0x40000000 /* Private, transport module shares */ 192 /* an sodirect_t with sockfs */ 193 194 /* queue sqflags (protected by SQLOCK). */ 195 #define Q_SQQUEUED 0x01 /* Queue is in the syncq list */ 196 #define Q_SQDRAINING 0x02 /* Servicing syncq msgs. */ 197 /* This is also noted by the */ 198 /* q_draining field, but this one is */ 199 /* protected by SQLOCK */ 200 201 /* 202 * Structure that describes the separate information 203 * for each priority band in the queue. 204 */ 205 typedef struct qband { 206 struct qband *qb_next; /* next band's info */ 207 size_t qb_count; /* number of bytes in band */ 208 struct msgb *qb_first; /* beginning of band's data */ 209 struct msgb *qb_last; /* end of band's data */ 210 size_t qb_hiwat; /* high water mark for band */ 211 size_t qb_lowat; /* low water mark for band */ 212 uint_t qb_flag; /* see below */ 213 size_t qb_mblkcnt; /* mblk counter for runaway msgs */ 214 } qband_t; 215 216 /* 217 * qband flags 218 */ 219 #define QB_FULL 0x01 /* band is considered full */ 220 #define QB_WANTW 0x02 /* Someone wants to write to band */ 221 #define QB_BACK 0x04 /* queue has been back-enabled */ 222 223 /* 224 * Maximum number of bands. 225 */ 226 #define NBAND 256 227 228 /* 229 * Fields that can be manipulated through strqset() and strqget(). 230 */ 231 typedef enum qfields { 232 QHIWAT = 0, /* q_hiwat or qb_hiwat */ 233 QLOWAT = 1, /* q_lowat or qb_lowat */ 234 QMAXPSZ = 2, /* q_maxpsz */ 235 QMINPSZ = 3, /* q_minpsz */ 236 QCOUNT = 4, /* q_count or qb_count */ 237 QFIRST = 5, /* q_first or qb_first */ 238 QLAST = 6, /* q_last or qb_last */ 239 QFLAG = 7, /* q_flag or qb_flag */ 240 QSTRUIOT = 8, /* q_struiot */ 241 QBAD = 9 242 } qfields_t; 243 244 /* 245 * Module information structure 246 */ 247 struct module_info { 248 ushort_t mi_idnum; /* module id number */ 249 char *mi_idname; /* module name */ 250 ssize_t mi_minpsz; /* min packet size accepted */ 251 ssize_t mi_maxpsz; /* max packet size accepted */ 252 size_t mi_hiwat; /* hi-water mark */ 253 size_t mi_lowat; /* lo-water mark */ 254 }; 255 256 /* 257 * queue information structure (with Synchronous STREAMS extensions) 258 */ 259 struct qinit { 260 int (*qi_putp)(); /* put procedure */ 261 int (*qi_srvp)(); /* service procedure */ 262 int (*qi_qopen)(); /* called on startup */ 263 int (*qi_qclose)(); /* called on finish */ 264 int (*qi_qadmin)(); /* for future use */ 265 struct module_info *qi_minfo; /* module information structure */ 266 struct module_stat *qi_mstat; /* module statistics structure */ 267 int (*qi_rwp)(); /* r/w procedure */ 268 int (*qi_infop)(); /* information procedure */ 269 int qi_struiot; /* stream uio type for struio() */ 270 }; 271 272 /* 273 * Values for qi_struiot and q_struiot: 274 */ 275 #define STRUIOT_NONE -1 /* doesn't support struio() */ 276 #define STRUIOT_DONTCARE 0 /* use current uiomove() (default) */ 277 #define STRUIOT_STANDARD 1 /* use standard uiomove() */ 278 279 /* 280 * Streamtab (used in cdevsw and fmodsw to point to module or driver) 281 */ 282 struct streamtab { 283 struct qinit *st_rdinit; 284 struct qinit *st_wrinit; 285 struct qinit *st_muxrinit; 286 struct qinit *st_muxwinit; 287 }; 288 289 /* 290 * Structure sent to mux drivers to indicate a link. 291 */ 292 struct linkblk { 293 queue_t *l_qtop; /* lowest level write queue of upper stream */ 294 /* (set to NULL for persistent links) */ 295 queue_t *l_qbot; /* highest level write queue of lower stream */ 296 int l_index; /* index for lower stream. */ 297 }; 298 299 /* 300 * Esballoc data buffer freeing routine 301 */ 302 typedef struct free_rtn { 303 void (*free_func)(); 304 caddr_t free_arg; 305 } frtn_t; 306 307 /* 308 * Data block descriptor 309 * 310 * NOTE: db_base, db_lim, db_ref and db_type are the *only* public fields, 311 * as described in datab(9S). Everything else is implementation-private. 312 */ 313 314 #define DBLK_REFMAX 255U 315 316 typedef struct datab { 317 frtn_t *db_frtnp; 318 unsigned char *db_base; 319 unsigned char *db_lim; 320 unsigned char db_ref; 321 unsigned char db_type; 322 unsigned char db_flags; 323 unsigned char db_struioflag; 324 pid_t db_cpid; /* cached pid, needs verification */ 325 void *db_cache; /* kmem cache descriptor */ 326 struct msgb *db_mblk; 327 void (*db_free)(struct msgb *, struct datab *); 328 void (*db_lastfree)(struct msgb *, struct datab *); 329 intptr_t db_cksumstart; 330 intptr_t db_cksumend; 331 intptr_t db_cksumstuff; 332 union { 333 double enforce_alignment; 334 unsigned char data[8]; 335 struct { 336 union { 337 uint32_t u32; 338 uint16_t u16; 339 } cksum_val; /* used to store calculated cksum */ 340 uint16_t flags; 341 uint16_t pad; 342 } cksum; 343 /* 344 * Union used for future extensions (pointer to data ?). 345 */ 346 } db_struioun; 347 struct fthdr *db_fthdr; 348 cred_t *db_credp; /* credential */ 349 } dblk_t; 350 351 #define db_cksum16 db_struioun.cksum.cksum_val.u16 352 #define db_cksum32 db_struioun.cksum.cksum_val.u32 353 354 /* 355 * Accessor macros for private dblk_t fields (the rest are in <sys/strsun.h>). 356 */ 357 #define DB_CPID(mp) ((mp)->b_datap->db_cpid) 358 #define DB_CRED(mp) ((mp)->b_datap->db_credp) 359 #define DB_CREDDEF(mp, cr) (DB_CRED(mp) != NULL ? DB_CRED(mp) : (cr)) 360 #define DB_FTHDR(mp) ((mp)->b_datap->db_fthdr) 361 /* 362 * Used by GLDv2 to store the TCI information. 363 */ 364 #define DB_TCI(mp) ((mp)->b_datap->db_struioun.cksum.pad) 365 366 #define MBLK_GETLABEL(mp) \ 367 (DB_CRED(mp) != NULL ? crgetlabel(DB_CRED(mp)) : NULL) 368 369 /* 370 * Message block descriptor 371 */ 372 typedef struct msgb { 373 struct msgb *b_next; 374 struct msgb *b_prev; 375 struct msgb *b_cont; 376 unsigned char *b_rptr; 377 unsigned char *b_wptr; 378 struct datab *b_datap; 379 unsigned char b_band; 380 unsigned char b_tag; 381 unsigned short b_flag; 382 queue_t *b_queue; /* for sync queues */ 383 } mblk_t; 384 385 /* 386 * bcache descriptor 387 */ 388 typedef struct bcache { 389 kmutex_t mutex; 390 struct kmem_cache *buffer_cache; 391 struct kmem_cache *dblk_cache; 392 int alloc; 393 int destroy; 394 size_t size; 395 uint_t align; 396 } bcache_t; 397 398 /* 399 * db_flags values (all implementation private!) 400 */ 401 #define DBLK_REFMIN 0x01 /* min refcnt stored in low bit */ 402 #define DBLK_COOKED 0x02 /* message has been processed once */ 403 #define DBLK_UIOA 0x04 /* uioamove() is pending */ 404 405 /* 406 * db_struioflag values: 407 */ 408 #define STRUIO_SPEC 0x01 /* struio{get,put}() special mblk */ 409 #define STRUIO_DONE 0x02 /* struio done (could be partial) */ 410 #define STRUIO_IP 0x04 /* IP checksum stored in db_struioun */ 411 #define STRUIO_ZC 0x08 /* mblk eligible for zero-copy */ 412 #define STRUIO_ZCNOTIFY 0x10 /* notify stream head when mblk acked */ 413 #define STRUIO_EAGER 0x20 /* new eager; db_cksumstart has squeue to use */ 414 #define STRUIO_POLICY 0x40 /* new eager when IPsec is enabled */ 415 #define STRUIO_CONNECT 0x80 /* conn did a connect */ 416 417 /* 418 * Message flags. These are interpreted by the stream head. 419 */ 420 #define MSGMARK 0x01 /* last byte of message is "marked" */ 421 #define MSGNOLOOP 0x02 /* don't loop message around to */ 422 /* write side of stream */ 423 #define MSGDELIM 0x04 /* message is delimited */ 424 /* UNUSED 0x08 was MSGNOGET (can be recycled) */ 425 #define MSGMARKNEXT 0x10 /* Private: first byte of next msg marked */ 426 #define MSGNOTMARKNEXT 0x20 /* Private: ... not marked */ 427 #define MSGHASREF 0x40 /* Private: message has reference to owner */ 428 429 /* 430 * Streams message types. 431 */ 432 433 /* 434 * Data and protocol messages (regular and priority) 435 */ 436 #define M_DATA 0x00 /* regular data */ 437 #define M_PROTO 0x01 /* protocol control */ 438 #define M_MULTIDATA 0x02 /* reserved for Multidata use only */ 439 440 /* 441 * Control messages (regular and priority) 442 */ 443 #define M_BREAK 0x08 /* line break */ 444 #define M_PASSFP 0x09 /* pass file pointer */ 445 #define M_EVENT 0x0a /* Obsoleted: do not use */ 446 #define M_SIG 0x0b /* generate process signal */ 447 #define M_DELAY 0x0c /* real-time xmit delay (1 param) */ 448 #define M_CTL 0x0d /* device-specific control message */ 449 #define M_IOCTL 0x0e /* ioctl; set/get params */ 450 #define M_SETOPTS 0x10 /* set various stream head options */ 451 #define M_RSE 0x11 /* reserved for RSE use only */ 452 453 /* 454 * Control messages (high priority; go to head of queue) 455 */ 456 #define M_IOCACK 0x81 /* acknowledge ioctl */ 457 #define M_IOCNAK 0x82 /* negative ioctl acknowledge */ 458 #define M_PCPROTO 0x83 /* priority proto message */ 459 #define M_PCSIG 0x84 /* generate process signal */ 460 #define M_READ 0x85 /* generate read notification */ 461 #define M_FLUSH 0x86 /* flush your queues */ 462 #define M_STOP 0x87 /* stop transmission immediately */ 463 #define M_START 0x88 /* restart transmission after stop */ 464 #define M_HANGUP 0x89 /* line disconnect */ 465 #define M_ERROR 0x8a /* send error to stream head */ 466 #define M_COPYIN 0x8b /* request to copyin data */ 467 #define M_COPYOUT 0x8c /* request to copyout data */ 468 #define M_IOCDATA 0x8d /* response to M_COPYIN and M_COPYOUT */ 469 #define M_PCRSE 0x8e /* reserved for RSE use only */ 470 #define M_STOPI 0x8f /* stop reception immediately */ 471 #define M_STARTI 0x90 /* restart reception after stop */ 472 #define M_PCEVENT 0x91 /* Obsoleted: do not use */ 473 #define M_UNHANGUP 0x92 /* line reconnect, sigh */ 474 #define M_CMD 0x93 /* out-of-band ioctl command */ 475 476 /* 477 * Queue message class definitions. 478 */ 479 #define QNORM 0x00 /* normal priority messages */ 480 #define QPCTL 0x80 /* high priority cntrl messages */ 481 482 /* 483 * IOCTL structure - this structure is the format of the M_IOCTL message type. 484 */ 485 #if defined(_LP64) 486 struct iocblk { 487 int ioc_cmd; /* ioctl command type */ 488 cred_t *ioc_cr; /* full credentials */ 489 uint_t ioc_id; /* ioctl id */ 490 uint_t ioc_flag; /* see below */ 491 size_t ioc_count; /* count of bytes in data field */ 492 int ioc_rval; /* return value */ 493 int ioc_error; /* error code */ 494 }; 495 #else 496 struct iocblk { 497 int ioc_cmd; /* ioctl command type */ 498 cred_t *ioc_cr; /* full credentials */ 499 uint_t ioc_id; /* ioctl id */ 500 size_t ioc_count; /* count of bytes in data field */ 501 int ioc_error; /* error code */ 502 int ioc_rval; /* return value */ 503 int ioc_fill1; 504 uint_t ioc_flag; /* see below */ 505 int ioc_filler[2]; /* reserved for future use */ 506 }; 507 #endif /* _LP64 */ 508 509 typedef struct iocblk *IOCP; 510 511 /* {ioc,cp}_flags values */ 512 513 #define IOC_MODELS DATAMODEL_MASK /* Note: 0x0FF00000 */ 514 #define IOC_ILP32 DATAMODEL_ILP32 /* ioctl origin is ILP32 */ 515 #define IOC_LP64 DATAMODEL_LP64 /* ioctl origin is LP64 */ 516 #define IOC_NATIVE DATAMODEL_NATIVE 517 #define IOC_NONE DATAMODEL_NONE /* dummy comparison value */ 518 519 /* 520 * Is the ioctl data formatted for our native model? 521 */ 522 #define IOC_CONVERT_FROM(iocp) ddi_model_convert_from( \ 523 ((struct iocblk *)iocp)->ioc_flag) 524 525 /* 526 * structure for the M_COPYIN and M_COPYOUT message types. 527 */ 528 #if defined(_LP64) 529 struct copyreq { 530 int cq_cmd; /* ioctl command (from ioc_cmd) */ 531 cred_t *cq_cr; /* full credentials (from ioc_cmd) */ 532 uint_t cq_id; /* ioctl id (from ioc_id) */ 533 uint_t cq_flag; /* must be zero */ 534 mblk_t *cq_private; /* private state information */ 535 caddr_t cq_addr; /* address to copy data to/from */ 536 size_t cq_size; /* number of bytes to copy */ 537 }; 538 #else 539 struct copyreq { 540 int cq_cmd; /* ioctl command (from ioc_cmd) */ 541 cred_t *cq_cr; /* full credentials */ 542 uint_t cq_id; /* ioctl id (from ioc_id) */ 543 caddr_t cq_addr; /* address to copy data to/from */ 544 size_t cq_size; /* number of bytes to copy */ 545 uint_t cq_flag; /* must be zero */ 546 mblk_t *cq_private; /* private state information */ 547 int cq_filler[4]; /* reserved for future use */ 548 }; 549 #endif /* _LP64 */ 550 551 /* 552 * structure for the M_IOCDATA message type. 553 */ 554 #if defined(_LP64) 555 struct copyresp { 556 int cp_cmd; /* ioctl command (from ioc_cmd) */ 557 cred_t *cp_cr; /* full credentials (from ioc_cmd) */ 558 uint_t cp_id; /* ioctl id (from ioc_id) */ 559 uint_t cp_flag; /* datamodel IOC_ flags; see above */ 560 mblk_t *cp_private; /* private state information */ 561 caddr_t cp_rval; /* status of request: 0 -> success */ 562 /* non-zero -> failure */ 563 }; 564 #else 565 struct copyresp { 566 int cp_cmd; /* ioctl command (from ioc_cmd) */ 567 cred_t *cp_cr; /* full credentials */ 568 uint_t cp_id; /* ioctl id (from ioc_id) */ 569 caddr_t cp_rval; /* status of request: 0 -> success */ 570 /* non-zero -> failure */ 571 size_t cp_pad1; 572 uint_t cp_pad2; 573 mblk_t *cp_private; /* private state information */ 574 uint_t cp_flag; /* datamodel IOC_ flags; see above */ 575 int cp_filler[3]; 576 }; 577 #endif /* _LP64 */ 578 579 /* 580 * Since these structures are all intended to travel in the same message 581 * at different stages of a STREAMS ioctl, this union is used to determine 582 * the message size in strdoioctl(). 583 */ 584 union ioctypes { 585 struct iocblk iocblk; 586 struct copyreq copyreq; 587 struct copyresp copyresp; 588 }; 589 590 /* 591 * Options structure for M_SETOPTS message. This is sent upstream 592 * by a module or driver to set stream head options. 593 */ 594 struct stroptions { 595 uint_t so_flags; /* options to set */ 596 short so_readopt; /* read option */ 597 ushort_t so_wroff; /* write offset */ 598 ssize_t so_minpsz; /* minimum read packet size */ 599 ssize_t so_maxpsz; /* maximum read packet size */ 600 size_t so_hiwat; /* read queue high water mark */ 601 size_t so_lowat; /* read queue low water mark */ 602 unsigned char so_band; /* band for water marks */ 603 ushort_t so_erropt; /* error option */ 604 ssize_t so_maxblk; /* maximum message block size */ 605 ushort_t so_copyopt; /* copy options (see stropts.h) */ 606 ushort_t so_tail; /* space available at the end */ 607 }; 608 609 /* flags for stream options set message */ 610 611 #define SO_ALL 0x003f /* set all old options */ 612 #define SO_READOPT 0x0001 /* set read option */ 613 #define SO_WROFF 0x0002 /* set write offset */ 614 #define SO_MINPSZ 0x0004 /* set min packet size */ 615 #define SO_MAXPSZ 0x0008 /* set max packet size */ 616 #define SO_HIWAT 0x0010 /* set high water mark */ 617 #define SO_LOWAT 0x0020 /* set low water mark */ 618 #define SO_MREADON 0x0040 /* set read notification ON */ 619 #define SO_MREADOFF 0x0080 /* set read notification OFF */ 620 #define SO_NDELON 0x0100 /* old TTY semantics for NDELAY reads/writes */ 621 #define SO_NDELOFF 0x0200 /* STREAMS semantics for NDELAY reads/writes */ 622 #define SO_ISTTY 0x0400 /* the stream is acting as a terminal */ 623 #define SO_ISNTTY 0x0800 /* the stream is not acting as a terminal */ 624 #define SO_TOSTOP 0x1000 /* stop on background writes to this stream */ 625 #define SO_TONSTOP 0x2000 /* do not stop on background writes to stream */ 626 #define SO_BAND 0x4000 /* water marks affect band */ 627 #define SO_DELIM 0x8000 /* messages are delimited */ 628 #define SO_NODELIM 0x010000 /* turn off delimiters */ 629 #define SO_STRHOLD 0x020000 /* No longer implemented */ 630 #define SO_ERROPT 0x040000 /* set error option */ 631 #define SO_COPYOPT 0x080000 /* copy option(s) present */ 632 #define SO_MAXBLK 0x100000 /* set maximum message block size */ 633 #define SO_TAIL 0x200000 /* set the extra allocated space */ 634 635 #ifdef _KERNEL 636 /* 637 * Structure for rw (read/write) procedure calls. A pointer 638 * to a struiod_t is passed as a parameter to the rwnext() call. 639 * 640 * Note: DEF_IOV_MAX is defined and used as it is in "fs/vncalls.c" 641 * as there isn't a formal definition of IOV_MAX ??? 642 */ 643 #define DEF_IOV_MAX 16 644 645 typedef struct struiod { 646 mblk_t *d_mp; /* pointer to mblk (chain) */ 647 uio_t d_uio; /* uio info */ 648 iovec_t d_iov[DEF_IOV_MAX]; /* iov referenced by uio */ 649 } struiod_t; 650 651 /* 652 * Structure for information procedure calls. 653 */ 654 typedef struct infod { 655 unsigned char d_cmd; /* info info request command */ 656 unsigned char d_res; /* info info command results */ 657 int d_bytes; /* mblk(s) byte count */ 658 int d_count; /* count of mblk(s) */ 659 uio_t *d_uiop; /* pointer to uio struct */ 660 } infod_t; 661 /* 662 * Values for d_cmd & d_res. 663 */ 664 #define INFOD_FIRSTBYTES 0x02 /* return msgbsize() of first mblk */ 665 #define INFOD_BYTES 0x04 /* return msgbsize() of all mblk(s) */ 666 #define INFOD_COUNT 0x08 /* return count of mblk(s) */ 667 #define INFOD_COPYOUT 0x10 /* copyout any M_DATA mblk(s) */ 668 669 /* 670 * Structure used by _I_CMD mechanism, similar in spirit to iocblk. 671 */ 672 typedef struct cmdblk { 673 int cb_cmd; /* ioctl command type */ 674 cred_t *cb_cr; /* full credentials */ 675 uint_t cb_len; /* payload size */ 676 int cb_error; /* error code */ 677 } cmdblk_t; 678 679 #endif /* _KERNEL */ 680 681 /* 682 * Miscellaneous parameters and flags. 683 */ 684 685 /* 686 * Values for stream flag in open to indicate module open, clone open, 687 * and the return value for failure. 688 */ 689 #define MODOPEN 0x1 /* open as a module */ 690 #define CLONEOPEN 0x2 /* clone open; pick own minor dev */ 691 #define OPENFAIL -1 /* returned for open failure */ 692 693 /* 694 * Priority definitions for block allocation. 695 */ 696 #define BPRI_LO 1 697 #define BPRI_MED 2 698 #define BPRI_HI 3 699 700 /* 701 * Value for packet size that denotes infinity 702 */ 703 #define INFPSZ -1 704 705 /* 706 * Flags for flushq() 707 */ 708 #define FLUSHALL 1 /* flush all messages */ 709 #define FLUSHDATA 0 /* don't flush control messages */ 710 711 /* 712 * Flag for transparent ioctls 713 */ 714 #define TRANSPARENT (unsigned int)(-1) 715 716 /* 717 * Stream head default high/low water marks 718 */ 719 #define STRHIGH 5120 720 #define STRLOW 1024 721 722 /* 723 * qwriter perimeter types 724 */ 725 #define PERIM_INNER 1 /* The inner perimeter */ 726 #define PERIM_OUTER 2 /* The outer perimeter */ 727 728 /* 729 * Definitions of Streams macros and function interfaces. 730 */ 731 732 /* 733 * canenable - check if queue can be enabled by putq(). 734 */ 735 #define canenable(q) !((q)->q_flag & QNOENB) 736 737 /* 738 * Test if data block type is one of the data messages (i.e. not a control 739 * message). 740 */ 741 #define datamsg(type) \ 742 ((type) == M_DATA || \ 743 (type) == M_MULTIDATA || \ 744 (type) == M_PROTO || \ 745 (type) == M_PCPROTO || \ 746 (type) == M_DELAY) 747 748 /* 749 * Extract queue class of message block. 750 */ 751 #define queclass(bp) (((bp)->b_datap->db_type >= QPCTL) ? QPCTL : QNORM) 752 753 /* 754 * Align address on next lower word boundary. 755 */ 756 #define straln(a) (caddr_t)((intptr_t)(a) & -(sizeof (int)-1)) 757 758 /* 759 * Find the max size of data block. 760 */ 761 #define bpsize(bp) ((unsigned int)(bp->b_datap->db_lim - bp->b_datap->db_base)) 762 763 #ifdef _KERNEL 764 765 /* 766 * For two-byte M_ERROR messages: indication that a side does not have an error 767 */ 768 #define NOERROR ((unsigned char)-1) 769 770 /* 771 * declarations of common routines 772 */ 773 774 extern mblk_t *allocb(size_t, uint_t); 775 extern mblk_t *desballoc(unsigned char *, size_t, uint_t, frtn_t *); 776 extern mblk_t *esballoc(unsigned char *, size_t, uint_t, frtn_t *); 777 extern bcache_t *bcache_create(char *, size_t, uint_t); 778 extern void bcache_destroy(bcache_t *); 779 extern mblk_t *bcache_allocb(bcache_t *, uint_t); 780 extern mblk_t *mkiocb(uint_t); 781 extern int testb(size_t, uint_t); 782 extern bufcall_id_t bufcall(size_t, uint_t, void (*)(void *), void *); 783 extern bufcall_id_t esbbcall(uint_t, void (*)(void *), void *); 784 extern void freeb(struct msgb *); 785 extern void freemsg(mblk_t *); 786 extern mblk_t *dupb(mblk_t *); 787 extern mblk_t *dupmsg(mblk_t *); 788 extern mblk_t *dupmsg_noloan(mblk_t *); 789 extern mblk_t *copyb(mblk_t *); 790 extern mblk_t *copymsg(mblk_t *); 791 extern void linkb(mblk_t *, mblk_t *); 792 extern mblk_t *unlinkb(mblk_t *); 793 extern mblk_t *reallocb(mblk_t *, size_t, uint_t); /* private */ 794 extern mblk_t *rmvb(mblk_t *, mblk_t *); 795 extern int pullupmsg(struct msgb *, ssize_t); 796 extern mblk_t *msgpullup(struct msgb *, ssize_t); 797 extern int adjmsg(struct msgb *, ssize_t); 798 extern size_t msgdsize(struct msgb *); 799 extern mblk_t *getq(queue_t *); 800 extern void rmvq(queue_t *, mblk_t *); 801 extern void flushq(queue_t *, int); 802 extern void flushq_common(queue_t *, int, int); 803 extern void flushband(queue_t *, unsigned char, int); 804 extern int canput(queue_t *); 805 extern int bcanput(queue_t *, unsigned char); 806 extern int canputnext(queue_t *); 807 extern int bcanputnext(queue_t *, unsigned char); 808 extern int putq(queue_t *, mblk_t *); 809 extern int putbq(queue_t *, mblk_t *); 810 extern int insq(queue_t *, mblk_t *, mblk_t *); 811 extern void put(queue_t *, mblk_t *); 812 extern void putnext(queue_t *, mblk_t *); 813 extern int putctl(queue_t *, int); 814 extern int putctl1(queue_t *, int, int); 815 extern int putnextctl(queue_t *, int); 816 extern int putnextctl1(queue_t *, int, int); 817 extern queue_t *backq(queue_t *); 818 extern void qreply(queue_t *, mblk_t *); 819 extern void qenable(queue_t *); 820 extern int qsize(queue_t *); 821 extern void noenable(queue_t *); 822 extern void enableok(queue_t *); 823 extern int strqset(queue_t *, qfields_t, unsigned char, intptr_t); 824 extern int strqget(queue_t *, qfields_t, unsigned char, void *); 825 extern void unbufcall(bufcall_id_t); 826 extern void qprocson(queue_t *); 827 extern void qprocsoff(queue_t *); 828 extern void freezestr(queue_t *); 829 extern void unfreezestr(queue_t *); 830 extern void qwait(queue_t *); 831 extern int qwait_sig(queue_t *); 832 extern boolean_t qwait_rw(queue_t *); 833 extern void qwriter(queue_t *, mblk_t *, void (*func)(), int); 834 extern timeout_id_t qtimeout(queue_t *, void (*func)(void *), void *, clock_t); 835 extern bufcall_id_t qbufcall(queue_t *, size_t, uint_t, 836 void (*)(void *), void *); 837 extern clock_t quntimeout(queue_t *, timeout_id_t); 838 extern void qunbufcall(queue_t *, bufcall_id_t); 839 extern void strwakeq(queue_t *, int); 840 extern int struioget(queue_t *, mblk_t *, struiod_t *, int); 841 extern int rwnext(queue_t *, struiod_t *); 842 extern int infonext(queue_t *, infod_t *); 843 extern int isuioq(queue_t *); 844 extern void create_putlocks(queue_t *, int); 845 extern int mp_cont_len(mblk_t *, int *); 846 847 /* 848 * shared or externally configured data structures 849 */ 850 extern int nstrpush; /* maximum number of pushes allowed */ 851 852 #endif /* _KERNEL */ 853 854 #ifdef __cplusplus 855 } 856 #endif 857 858 #endif /* _SYS_STREAM_H */ 859