1/* 2 * GPL HEADER START 3 * 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 only, 8 * as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License version 2 for more details (a copy is included 14 * in the LICENSE file that accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License 17 * version 2 along with this program; If not, see 18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf 19 * 20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 21 * CA 95054 USA or visit www.sun.com if you need additional information or 22 * have any questions. 23 * 24 * GPL HEADER END 25 */ 26/* 27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. 28 * Use is subject to license terms. 29 * 30 * Copyright (c) 2012, Intel Corporation. 31 */ 32/* 33 * This file is part of Lustre, http://www.lustre.org/ 34 * Lustre is a trademark of Sun Microsystems, Inc. 35 */ 36 37#ifndef __LNET_TYPES_H__ 38#define __LNET_TYPES_H__ 39 40/** \addtogroup lnet 41 * @{ */ 42 43#include <linux/libcfs/libcfs.h> 44 45/** \addtogroup lnet_addr 46 * @{ */ 47 48/** Portal reserved for LNet's own use. 49 * \see lustre/include/lustre/lustre_idl.h for Lustre portal assignments. 50 */ 51#define LNET_RESERVED_PORTAL 0 52 53/** 54 * Address of an end-point in an LNet network. 55 * 56 * A node can have multiple end-points and hence multiple addresses. 57 * An LNet network can be a simple network (e.g. tcp0) or a network of 58 * LNet networks connected by LNet routers. Therefore an end-point address 59 * has two parts: network ID, and address within a network. 60 * 61 * \see LNET_NIDNET, LNET_NIDADDR, and LNET_MKNID. 62 */ 63typedef __u64 lnet_nid_t; 64/** 65 * ID of a process in a node. Shortened as PID to distinguish from 66 * lnet_process_id_t, the global process ID. 67 */ 68typedef __u32 lnet_pid_t; 69 70/** wildcard NID that matches any end-point address */ 71#define LNET_NID_ANY ((lnet_nid_t) -1) 72/** wildcard PID that matches any lnet_pid_t */ 73#define LNET_PID_ANY ((lnet_pid_t) -1) 74 75#define LNET_PID_RESERVED 0xf0000000 /* reserved bits in PID */ 76#define LNET_PID_USERFLAG 0x80000000 /* set in userspace peers */ 77 78#define LNET_TIME_FOREVER (-1) 79 80/** 81 * Objects maintained by the LNet are accessed through handles. Handle types 82 * have names of the form lnet_handle_xx_t, where xx is one of the two letter 83 * object type codes ('eq' for event queue, 'md' for memory descriptor, and 84 * 'me' for match entry). 85 * Each type of object is given a unique handle type to enhance type checking. 86 * The type lnet_handle_any_t can be used when a generic handle is needed. 87 * Every handle value can be converted into a value of type lnet_handle_any_t 88 * without loss of information. 89 */ 90typedef struct { 91 __u64 cookie; 92} lnet_handle_any_t; 93 94typedef lnet_handle_any_t lnet_handle_eq_t; 95typedef lnet_handle_any_t lnet_handle_md_t; 96typedef lnet_handle_any_t lnet_handle_me_t; 97 98#define LNET_WIRE_HANDLE_COOKIE_NONE (-1) 99 100/** 101 * Invalidate handle \a h. 102 */ 103static inline void LNetInvalidateHandle(lnet_handle_any_t *h) 104{ 105 h->cookie = LNET_WIRE_HANDLE_COOKIE_NONE; 106} 107 108/** 109 * Compare handles \a h1 and \a h2. 110 * 111 * \return 1 if handles are equal, 0 if otherwise. 112 */ 113static inline int LNetHandleIsEqual (lnet_handle_any_t h1, lnet_handle_any_t h2) 114{ 115 return (h1.cookie == h2.cookie); 116} 117 118/** 119 * Check whether handle \a h is invalid. 120 * 121 * \return 1 if handle is invalid, 0 if valid. 122 */ 123static inline int LNetHandleIsInvalid(lnet_handle_any_t h) 124{ 125 return (LNET_WIRE_HANDLE_COOKIE_NONE == h.cookie); 126} 127 128/** 129 * Global process ID. 130 */ 131typedef struct { 132 /** node id */ 133 lnet_nid_t nid; 134 /** process id */ 135 lnet_pid_t pid; 136} lnet_process_id_t; 137/** @} lnet_addr */ 138 139/** \addtogroup lnet_me 140 * @{ */ 141 142/** 143 * Specifies whether the match entry or memory descriptor should be unlinked 144 * automatically (LNET_UNLINK) or not (LNET_RETAIN). 145 */ 146typedef enum { 147 LNET_RETAIN = 0, 148 LNET_UNLINK 149} lnet_unlink_t; 150 151/** 152 * Values of the type lnet_ins_pos_t are used to control where a new match 153 * entry is inserted. The value LNET_INS_BEFORE is used to insert the new 154 * entry before the current entry or before the head of the list. The value 155 * LNET_INS_AFTER is used to insert the new entry after the current entry 156 * or after the last item in the list. 157 */ 158typedef enum { 159 /** insert ME before current position or head of the list */ 160 LNET_INS_BEFORE, 161 /** insert ME after current position or tail of the list */ 162 LNET_INS_AFTER, 163 /** attach ME at tail of local CPU partition ME list */ 164 LNET_INS_LOCAL 165} lnet_ins_pos_t; 166 167/** @} lnet_me */ 168 169/** \addtogroup lnet_md 170 * @{ */ 171 172/** 173 * Defines the visible parts of a memory descriptor. Values of this type 174 * are used to initialize memory descriptors. 175 */ 176typedef struct { 177 /** 178 * Specify the memory region associated with the memory descriptor. 179 * If the options field has: 180 * - LNET_MD_KIOV bit set: The start field points to the starting 181 * address of an array of lnet_kiov_t and the length field specifies 182 * the number of entries in the array. The length can't be bigger 183 * than LNET_MAX_IOV. The lnet_kiov_t is used to describe page-based 184 * fragments that are not necessarily mapped in virtal memory. 185 * - LNET_MD_IOVEC bit set: The start field points to the starting 186 * address of an array of struct iovec and the length field specifies 187 * the number of entries in the array. The length can't be bigger 188 * than LNET_MAX_IOV. The struct iovec is used to describe fragments 189 * that have virtual addresses. 190 * - Otherwise: The memory region is contiguous. The start field 191 * specifies the starting address for the memory region and the 192 * length field specifies its length. 193 * 194 * When the memory region is fragmented, all fragments but the first 195 * one must start on page boundary, and all but the last must end on 196 * page boundary. 197 */ 198 void *start; 199 unsigned int length; 200 /** 201 * Specifies the maximum number of operations that can be performed 202 * on the memory descriptor. An operation is any action that could 203 * possibly generate an event. In the usual case, the threshold value 204 * is decremented for each operation on the MD. When the threshold 205 * drops to zero, the MD becomes inactive and does not respond to 206 * operations. A threshold value of LNET_MD_THRESH_INF indicates that 207 * there is no bound on the number of operations that may be applied 208 * to a MD. 209 */ 210 int threshold; 211 /** 212 * Specifies the largest incoming request that the memory descriptor 213 * should respond to. When the unused portion of a MD (length - 214 * local offset) falls below this value, the MD becomes inactive and 215 * does not respond to further operations. This value is only used 216 * if the LNET_MD_MAX_SIZE option is set. 217 */ 218 int max_size; 219 /** 220 * Specifies the behavior of the memory descriptor. A bitwise OR 221 * of the following values can be used: 222 * - LNET_MD_OP_PUT: The LNet PUT operation is allowed on this MD. 223 * - LNET_MD_OP_GET: The LNet GET operation is allowed on this MD. 224 * - LNET_MD_MANAGE_REMOTE: The offset used in accessing the memory 225 * region is provided by the incoming request. By default, the 226 * offset is maintained locally. When maintained locally, the 227 * offset is incremented by the length of the request so that 228 * the next operation (PUT or GET) will access the next part of 229 * the memory region. Note that only one offset variable exists 230 * per memory descriptor. If both PUT and GET operations are 231 * performed on a memory descriptor, the offset is updated each time. 232 * - LNET_MD_TRUNCATE: The length provided in the incoming request can 233 * be reduced to match the memory available in the region (determined 234 * by subtracting the offset from the length of the memory region). 235 * By default, if the length in the incoming operation is greater 236 * than the amount of memory available, the operation is rejected. 237 * - LNET_MD_ACK_DISABLE: An acknowledgment should not be sent for 238 * incoming PUT operations, even if requested. By default, 239 * acknowledgments are sent for PUT operations that request an 240 * acknowledgment. Acknowledgments are never sent for GET operations. 241 * The data sent in the REPLY serves as an implicit acknowledgment. 242 * - LNET_MD_KIOV: The start and length fields specify an array of 243 * lnet_kiov_t. 244 * - LNET_MD_IOVEC: The start and length fields specify an array of 245 * struct iovec. 246 * - LNET_MD_MAX_SIZE: The max_size field is valid. 247 * 248 * Note: 249 * - LNET_MD_KIOV or LNET_MD_IOVEC allows for a scatter/gather 250 * capability for memory descriptors. They can't be both set. 251 * - When LNET_MD_MAX_SIZE is set, the total length of the memory 252 * region (i.e. sum of all fragment lengths) must not be less than 253 * \a max_size. 254 */ 255 unsigned int options; 256 /** 257 * A user-specified value that is associated with the memory 258 * descriptor. The value does not need to be a pointer, but must fit 259 * in the space used by a pointer. This value is recorded in events 260 * associated with operations on this MD. 261 */ 262 void *user_ptr; 263 /** 264 * A handle for the event queue used to log the operations performed on 265 * the memory region. If this argument is a NULL handle (i.e. nullified 266 * by LNetInvalidateHandle()), operations performed on this memory 267 * descriptor are not logged. 268 */ 269 lnet_handle_eq_t eq_handle; 270} lnet_md_t; 271 272/* Max Transfer Unit (minimum supported everywhere). 273 * CAVEAT EMPTOR, with multinet (i.e. routers forwarding between networks) 274 * these limits are system wide and not interface-local. */ 275#define LNET_MTU_BITS 20 276#define LNET_MTU (1 << LNET_MTU_BITS) 277 278/** limit on the number of fragments in discontiguous MDs */ 279#define LNET_MAX_IOV 256 280 281/* Max payload size */ 282# define LNET_MAX_PAYLOAD CONFIG_LNET_MAX_PAYLOAD 283# if (LNET_MAX_PAYLOAD < LNET_MTU) 284# error "LNET_MAX_PAYLOAD too small - error in configure --with-max-payload-mb" 285# else 286# if (LNET_MAX_PAYLOAD > (PAGE_SIZE * LNET_MAX_IOV)) 287/* PAGE_SIZE is a constant: check with cpp! */ 288# error "LNET_MAX_PAYLOAD too large - error in configure --with-max-payload-mb" 289# endif 290# endif 291 292/** 293 * Options for the MD structure. See lnet_md_t::options. 294 */ 295#define LNET_MD_OP_PUT (1 << 0) 296/** See lnet_md_t::options. */ 297#define LNET_MD_OP_GET (1 << 1) 298/** See lnet_md_t::options. */ 299#define LNET_MD_MANAGE_REMOTE (1 << 2) 300/* unused (1 << 3) */ 301/** See lnet_md_t::options. */ 302#define LNET_MD_TRUNCATE (1 << 4) 303/** See lnet_md_t::options. */ 304#define LNET_MD_ACK_DISABLE (1 << 5) 305/** See lnet_md_t::options. */ 306#define LNET_MD_IOVEC (1 << 6) 307/** See lnet_md_t::options. */ 308#define LNET_MD_MAX_SIZE (1 << 7) 309/** See lnet_md_t::options. */ 310#define LNET_MD_KIOV (1 << 8) 311 312/* For compatibility with Cray Portals */ 313#define LNET_MD_PHYS 0 314 315/** Infinite threshold on MD operations. See lnet_md_t::threshold */ 316#define LNET_MD_THRESH_INF (-1) 317 318/* NB lustre portals uses struct iovec internally! */ 319typedef struct iovec lnet_md_iovec_t; 320 321/** 322 * A page-based fragment of a MD. 323 */ 324typedef struct { 325 /** Pointer to the page where the fragment resides */ 326 struct page *kiov_page; 327 /** Length in bytes of the fragment */ 328 unsigned int kiov_len; 329 /** 330 * Starting offset of the fragment within the page. Note that the 331 * end of the fragment must not pass the end of the page; i.e., 332 * kiov_len + kiov_offset <= PAGE_CACHE_SIZE. 333 */ 334 unsigned int kiov_offset; 335} lnet_kiov_t; 336/** @} lnet_md */ 337 338/** \addtogroup lnet_eq 339 * @{ */ 340 341/** 342 * Six types of events can be logged in an event queue. 343 */ 344typedef enum { 345 /** An incoming GET operation has completed on the MD. */ 346 LNET_EVENT_GET = 1, 347 /** 348 * An incoming PUT operation has completed on the MD. The 349 * underlying layers will not alter the memory (on behalf of this 350 * operation) once this event has been logged. 351 */ 352 LNET_EVENT_PUT, 353 /** 354 * A REPLY operation has completed. This event is logged after the 355 * data (if any) from the REPLY has been written into the MD. 356 */ 357 LNET_EVENT_REPLY, 358 /** An acknowledgment has been received. */ 359 LNET_EVENT_ACK, 360 /** 361 * An outgoing send (PUT or GET) operation has completed. This event 362 * is logged after the entire buffer has been sent and it is safe for 363 * the caller to reuse the buffer. 364 * 365 * Note: 366 * - The LNET_EVENT_SEND doesn't guarantee message delivery. It can 367 * happen even when the message has not yet been put out on wire. 368 * - It's unsafe to assume that in an outgoing GET operation 369 * the LNET_EVENT_SEND event would happen before the 370 * LNET_EVENT_REPLY event. The same holds for LNET_EVENT_SEND and 371 * LNET_EVENT_ACK events in an outgoing PUT operation. 372 */ 373 LNET_EVENT_SEND, 374 /** 375 * A MD has been unlinked. Note that LNetMDUnlink() does not 376 * necessarily trigger an LNET_EVENT_UNLINK event. 377 * \see LNetMDUnlink 378 */ 379 LNET_EVENT_UNLINK, 380} lnet_event_kind_t; 381 382#define LNET_SEQ_BASETYPE long 383typedef unsigned LNET_SEQ_BASETYPE lnet_seq_t; 384#define LNET_SEQ_GT(a,b) (((signed LNET_SEQ_BASETYPE)((a) - (b))) > 0) 385 386/* XXX 387 * cygwin need the pragma line, not clear if it's needed in other places. 388 * checking!!! 389 */ 390#ifdef __CYGWIN__ 391#pragma pack(push, 4) 392#endif 393 394/** 395 * Information about an event on a MD. 396 */ 397typedef struct { 398 /** The identifier (nid, pid) of the target. */ 399 lnet_process_id_t target; 400 /** The identifier (nid, pid) of the initiator. */ 401 lnet_process_id_t initiator; 402 /** 403 * The NID of the immediate sender. If the request has been forwarded 404 * by routers, this is the NID of the last hop; otherwise it's the 405 * same as the initiator. 406 */ 407 lnet_nid_t sender; 408 /** Indicates the type of the event. */ 409 lnet_event_kind_t type; 410 /** The portal table index specified in the request */ 411 unsigned int pt_index; 412 /** A copy of the match bits specified in the request. */ 413 __u64 match_bits; 414 /** The length (in bytes) specified in the request. */ 415 unsigned int rlength; 416 /** 417 * The length (in bytes) of the data that was manipulated by the 418 * operation. For truncated operations, the manipulated length will be 419 * the number of bytes specified by the MD (possibly with an offset, 420 * see lnet_md_t). For all other operations, the manipulated length 421 * will be the length of the requested operation, i.e. rlength. 422 */ 423 unsigned int mlength; 424 /** 425 * The handle to the MD associated with the event. The handle may be 426 * invalid if the MD has been unlinked. 427 */ 428 lnet_handle_md_t md_handle; 429 /** 430 * A snapshot of the state of the MD immediately after the event has 431 * been processed. In particular, the threshold field in md will 432 * reflect the value of the threshold after the operation occurred. 433 */ 434 lnet_md_t md; 435 /** 436 * 64 bits of out-of-band user data. Only valid for LNET_EVENT_PUT. 437 * \see LNetPut 438 */ 439 __u64 hdr_data; 440 /** 441 * Indicates the completion status of the operation. It's 0 for 442 * successful operations, otherwise it's an error code. 443 */ 444 int status; 445 /** 446 * Indicates whether the MD has been unlinked. Note that: 447 * - An event with unlinked set is the last event on the MD. 448 * - This field is also set for an explicit LNET_EVENT_UNLINK event. 449 * \see LNetMDUnlink 450 */ 451 int unlinked; 452 /** 453 * The displacement (in bytes) into the memory region that the 454 * operation used. The offset can be determined by the operation for 455 * a remote managed MD or by the local MD. 456 * \see lnet_md_t::options 457 */ 458 unsigned int offset; 459 /** 460 * The sequence number for this event. Sequence numbers are unique 461 * to each event. 462 */ 463 volatile lnet_seq_t sequence; 464} lnet_event_t; 465#ifdef __CYGWIN__ 466#pragma pop 467#endif 468 469/** 470 * Event queue handler function type. 471 * 472 * The EQ handler runs for each event that is deposited into the EQ. The 473 * handler is supplied with a pointer to the event that triggered the 474 * handler invocation. 475 * 476 * The handler must not block, must be reentrant, and must not call any LNet 477 * API functions. It should return as quickly as possible. 478 */ 479typedef void (*lnet_eq_handler_t)(lnet_event_t *event); 480#define LNET_EQ_HANDLER_NONE NULL 481/** @} lnet_eq */ 482 483/** \addtogroup lnet_data 484 * @{ */ 485 486/** 487 * Specify whether an acknowledgment should be sent by target when the PUT 488 * operation completes (i.e., when the data has been written to a MD of the 489 * target process). 490 * 491 * \see lnet_md_t::options for the discussion on LNET_MD_ACK_DISABLE by which 492 * acknowledgments can be disabled for a MD. 493 */ 494typedef enum { 495 /** Request an acknowledgment */ 496 LNET_ACK_REQ, 497 /** Request that no acknowledgment should be generated. */ 498 LNET_NOACK_REQ 499} lnet_ack_req_t; 500/** @} lnet_data */ 501 502/** @} lnet */ 503#endif 504