1 /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ 2 /* 3 * Copyright (c) 2004, 2005 Intel Corporation. All rights reserved. 4 * Copyright (c) 2004 Topspin Corporation. All rights reserved. 5 * Copyright (c) 2004 Voltaire Corporation. All rights reserved. 6 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 7 * Copyright (c) 2019, Mellanox Technologies inc. All rights reserved. 8 */ 9 #ifndef IB_CM_H 10 #define IB_CM_H 11 12 #include <rdma/ib_mad.h> 13 #include <rdma/ib_sa.h> 14 15 /* ib_cm and ib_user_cm modules share /sys/class/infiniband_cm */ 16 extern struct class cm_class; 17 18 enum ib_cm_state { 19 IB_CM_IDLE, 20 IB_CM_LISTEN, 21 IB_CM_REQ_SENT, 22 IB_CM_REQ_RCVD, 23 IB_CM_MRA_REQ_SENT, 24 IB_CM_MRA_REQ_RCVD, 25 IB_CM_REP_SENT, 26 IB_CM_REP_RCVD, 27 IB_CM_MRA_REP_SENT, 28 IB_CM_MRA_REP_RCVD, 29 IB_CM_ESTABLISHED, 30 IB_CM_DREQ_SENT, 31 IB_CM_DREQ_RCVD, 32 IB_CM_TIMEWAIT, 33 IB_CM_SIDR_REQ_SENT, 34 IB_CM_SIDR_REQ_RCVD 35 }; 36 37 enum ib_cm_lap_state { 38 IB_CM_LAP_UNINIT, 39 IB_CM_LAP_IDLE, 40 IB_CM_LAP_SENT, 41 IB_CM_LAP_RCVD, 42 IB_CM_MRA_LAP_SENT, 43 IB_CM_MRA_LAP_RCVD, 44 }; 45 46 enum ib_cm_event_type { 47 IB_CM_REQ_ERROR, 48 IB_CM_REQ_RECEIVED, 49 IB_CM_REP_ERROR, 50 IB_CM_REP_RECEIVED, 51 IB_CM_RTU_RECEIVED, 52 IB_CM_USER_ESTABLISHED, 53 IB_CM_DREQ_ERROR, 54 IB_CM_DREQ_RECEIVED, 55 IB_CM_DREP_RECEIVED, 56 IB_CM_TIMEWAIT_EXIT, 57 IB_CM_MRA_RECEIVED, 58 IB_CM_REJ_RECEIVED, 59 IB_CM_LAP_ERROR, 60 IB_CM_LAP_RECEIVED, 61 IB_CM_APR_RECEIVED, 62 IB_CM_SIDR_REQ_ERROR, 63 IB_CM_SIDR_REQ_RECEIVED, 64 IB_CM_SIDR_REP_RECEIVED 65 }; 66 67 enum ib_cm_data_size { 68 IB_CM_REQ_PRIVATE_DATA_SIZE = 92, 69 IB_CM_MRA_PRIVATE_DATA_SIZE = 222, 70 IB_CM_REJ_PRIVATE_DATA_SIZE = 148, 71 IB_CM_REP_PRIVATE_DATA_SIZE = 196, 72 IB_CM_RTU_PRIVATE_DATA_SIZE = 224, 73 IB_CM_DREQ_PRIVATE_DATA_SIZE = 220, 74 IB_CM_DREP_PRIVATE_DATA_SIZE = 224, 75 IB_CM_REJ_ARI_LENGTH = 72, 76 IB_CM_LAP_PRIVATE_DATA_SIZE = 168, 77 IB_CM_APR_PRIVATE_DATA_SIZE = 148, 78 IB_CM_APR_INFO_LENGTH = 72, 79 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE = 216, 80 IB_CM_SIDR_REP_PRIVATE_DATA_SIZE = 136, 81 IB_CM_SIDR_REP_INFO_LENGTH = 72, 82 }; 83 84 struct ib_cm_id; 85 86 struct ib_cm_req_event_param { 87 struct ib_cm_id *listen_id; 88 89 /* P_Key that was used by the GMP's BTH header */ 90 u16 bth_pkey; 91 92 u8 port; 93 94 struct sa_path_rec *primary_path; 95 struct sa_path_rec *alternate_path; 96 97 /* 98 * SGID attribute of the primary path. Currently only 99 * useful for RoCE. Alternate path GID attributes 100 * are not yet supported. 101 */ 102 const struct ib_gid_attr *ppath_sgid_attr; 103 104 __be64 remote_ca_guid; 105 u32 remote_qkey; 106 u32 remote_qpn; 107 enum ib_qp_type qp_type; 108 109 u32 starting_psn; 110 u8 responder_resources; 111 u8 initiator_depth; 112 unsigned int local_cm_response_timeout:5; 113 unsigned int flow_control:1; 114 unsigned int remote_cm_response_timeout:5; 115 unsigned int retry_count:3; 116 unsigned int rnr_retry_count:3; 117 unsigned int srq:1; 118 }; 119 120 struct ib_cm_rep_event_param { 121 __be64 remote_ca_guid; 122 u32 remote_qkey; 123 u32 remote_qpn; 124 u32 starting_psn; 125 u8 responder_resources; 126 u8 initiator_depth; 127 unsigned int target_ack_delay:5; 128 unsigned int failover_accepted:2; 129 unsigned int flow_control:1; 130 unsigned int rnr_retry_count:3; 131 unsigned int srq:1; 132 }; 133 134 enum ib_cm_rej_reason { 135 IB_CM_REJ_NO_QP = 1, 136 IB_CM_REJ_NO_EEC = 2, 137 IB_CM_REJ_NO_RESOURCES = 3, 138 IB_CM_REJ_TIMEOUT = 4, 139 IB_CM_REJ_UNSUPPORTED = 5, 140 IB_CM_REJ_INVALID_COMM_ID = 6, 141 IB_CM_REJ_INVALID_COMM_INSTANCE = 7, 142 IB_CM_REJ_INVALID_SERVICE_ID = 8, 143 IB_CM_REJ_INVALID_TRANSPORT_TYPE = 9, 144 IB_CM_REJ_STALE_CONN = 10, 145 IB_CM_REJ_RDC_NOT_EXIST = 11, 146 IB_CM_REJ_INVALID_GID = 12, 147 IB_CM_REJ_INVALID_LID = 13, 148 IB_CM_REJ_INVALID_SL = 14, 149 IB_CM_REJ_INVALID_TRAFFIC_CLASS = 15, 150 IB_CM_REJ_INVALID_HOP_LIMIT = 16, 151 IB_CM_REJ_INVALID_PACKET_RATE = 17, 152 IB_CM_REJ_INVALID_ALT_GID = 18, 153 IB_CM_REJ_INVALID_ALT_LID = 19, 154 IB_CM_REJ_INVALID_ALT_SL = 20, 155 IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS = 21, 156 IB_CM_REJ_INVALID_ALT_HOP_LIMIT = 22, 157 IB_CM_REJ_INVALID_ALT_PACKET_RATE = 23, 158 IB_CM_REJ_PORT_CM_REDIRECT = 24, 159 IB_CM_REJ_PORT_REDIRECT = 25, 160 IB_CM_REJ_INVALID_MTU = 26, 161 IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES = 27, 162 IB_CM_REJ_CONSUMER_DEFINED = 28, 163 IB_CM_REJ_INVALID_RNR_RETRY = 29, 164 IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID = 30, 165 IB_CM_REJ_INVALID_CLASS_VERSION = 31, 166 IB_CM_REJ_INVALID_FLOW_LABEL = 32, 167 IB_CM_REJ_INVALID_ALT_FLOW_LABEL = 33 168 }; 169 170 struct ib_cm_rej_event_param { 171 enum ib_cm_rej_reason reason; 172 void *ari; 173 u8 ari_length; 174 }; 175 176 struct ib_cm_mra_event_param { 177 u8 service_timeout; 178 }; 179 180 struct ib_cm_lap_event_param { 181 struct sa_path_rec *alternate_path; 182 }; 183 184 enum ib_cm_apr_status { 185 IB_CM_APR_SUCCESS, 186 IB_CM_APR_INVALID_COMM_ID, 187 IB_CM_APR_UNSUPPORTED, 188 IB_CM_APR_REJECT, 189 IB_CM_APR_REDIRECT, 190 IB_CM_APR_IS_CURRENT, 191 IB_CM_APR_INVALID_QPN_EECN, 192 IB_CM_APR_INVALID_LID, 193 IB_CM_APR_INVALID_GID, 194 IB_CM_APR_INVALID_FLOW_LABEL, 195 IB_CM_APR_INVALID_TCLASS, 196 IB_CM_APR_INVALID_HOP_LIMIT, 197 IB_CM_APR_INVALID_PACKET_RATE, 198 IB_CM_APR_INVALID_SL 199 }; 200 201 struct ib_cm_apr_event_param { 202 enum ib_cm_apr_status ap_status; 203 void *apr_info; 204 u8 info_len; 205 }; 206 207 struct ib_cm_sidr_req_event_param { 208 struct ib_cm_id *listen_id; 209 __be64 service_id; 210 211 /* 212 * SGID attribute of the request. Currently only 213 * useful for RoCE. 214 */ 215 const struct ib_gid_attr *sgid_attr; 216 /* P_Key that was used by the GMP's BTH header */ 217 u16 bth_pkey; 218 u8 port; 219 u16 pkey; 220 }; 221 222 enum ib_cm_sidr_status { 223 IB_SIDR_SUCCESS, 224 IB_SIDR_UNSUPPORTED, 225 IB_SIDR_REJECT, 226 IB_SIDR_NO_QP, 227 IB_SIDR_REDIRECT, 228 IB_SIDR_UNSUPPORTED_VERSION 229 }; 230 231 struct ib_cm_sidr_rep_event_param { 232 enum ib_cm_sidr_status status; 233 u32 qkey; 234 u32 qpn; 235 void *info; 236 const struct ib_gid_attr *sgid_attr; 237 u8 info_len; 238 }; 239 240 struct ib_cm_event { 241 enum ib_cm_event_type event; 242 union { 243 struct ib_cm_req_event_param req_rcvd; 244 struct ib_cm_rep_event_param rep_rcvd; 245 /* No data for RTU received events. */ 246 struct ib_cm_rej_event_param rej_rcvd; 247 struct ib_cm_mra_event_param mra_rcvd; 248 struct ib_cm_lap_event_param lap_rcvd; 249 struct ib_cm_apr_event_param apr_rcvd; 250 /* No data for DREQ/DREP received events. */ 251 struct ib_cm_sidr_req_event_param sidr_req_rcvd; 252 struct ib_cm_sidr_rep_event_param sidr_rep_rcvd; 253 enum ib_wc_status send_status; 254 } param; 255 256 void *private_data; 257 }; 258 259 #define CM_REQ_ATTR_ID cpu_to_be16(0x0010) 260 #define CM_MRA_ATTR_ID cpu_to_be16(0x0011) 261 #define CM_REJ_ATTR_ID cpu_to_be16(0x0012) 262 #define CM_REP_ATTR_ID cpu_to_be16(0x0013) 263 #define CM_RTU_ATTR_ID cpu_to_be16(0x0014) 264 #define CM_DREQ_ATTR_ID cpu_to_be16(0x0015) 265 #define CM_DREP_ATTR_ID cpu_to_be16(0x0016) 266 #define CM_SIDR_REQ_ATTR_ID cpu_to_be16(0x0017) 267 #define CM_SIDR_REP_ATTR_ID cpu_to_be16(0x0018) 268 #define CM_LAP_ATTR_ID cpu_to_be16(0x0019) 269 #define CM_APR_ATTR_ID cpu_to_be16(0x001A) 270 271 /** 272 * ib_cm_handler - User-defined callback to process communication events. 273 * @cm_id: Communication identifier associated with the reported event. 274 * @event: Information about the communication event. 275 * 276 * IB_CM_REQ_RECEIVED and IB_CM_SIDR_REQ_RECEIVED communication events 277 * generated as a result of listen requests result in the allocation of a 278 * new @cm_id. The new @cm_id is returned to the user through this callback. 279 * Clients are responsible for destroying the new @cm_id. For peer-to-peer 280 * IB_CM_REQ_RECEIVED and all other events, the returned @cm_id corresponds 281 * to a user's existing communication identifier. 282 * 283 * Users may not call ib_destroy_cm_id while in the context of this callback; 284 * however, returning a non-zero value instructs the communication manager to 285 * destroy the @cm_id after the callback completes. 286 */ 287 typedef int (*ib_cm_handler)(struct ib_cm_id *cm_id, 288 const struct ib_cm_event *event); 289 290 struct ib_cm_id { 291 ib_cm_handler cm_handler; 292 void *context; 293 struct ib_device *device; 294 __be64 service_id; 295 __be64 service_mask; 296 enum ib_cm_state state; /* internal CM/debug use */ 297 enum ib_cm_lap_state lap_state; /* internal CM/debug use */ 298 __be32 local_id; 299 __be32 remote_id; 300 u32 remote_cm_qpn; /* 1 unless redirected */ 301 }; 302 303 /** 304 * ib_create_cm_id - Allocate a communication identifier. 305 * @device: Device associated with the cm_id. All related communication will 306 * be associated with the specified device. 307 * @cm_handler: Callback invoked to notify the user of CM events. 308 * @context: User specified context associated with the communication 309 * identifier. 310 * 311 * Communication identifiers are used to track connection states, service 312 * ID resolution requests, and listen requests. 313 */ 314 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 315 ib_cm_handler cm_handler, 316 void *context); 317 318 /** 319 * ib_destroy_cm_id - Destroy a connection identifier. 320 * @cm_id: Connection identifier to destroy. 321 * 322 * This call blocks until the connection identifier is destroyed. 323 */ 324 void ib_destroy_cm_id(struct ib_cm_id *cm_id); 325 326 #define IB_SERVICE_ID_AGN_MASK cpu_to_be64(0xFF00000000000000ULL) 327 #define IB_CM_ASSIGN_SERVICE_ID cpu_to_be64(0x0200000000000000ULL) 328 #define IB_CMA_SERVICE_ID cpu_to_be64(0x0000000001000000ULL) 329 #define IB_CMA_SERVICE_ID_MASK cpu_to_be64(0xFFFFFFFFFF000000ULL) 330 #define IB_SDP_SERVICE_ID cpu_to_be64(0x0000000000010000ULL) 331 #define IB_SDP_SERVICE_ID_MASK cpu_to_be64(0xFFFFFFFFFFFF0000ULL) 332 333 /** 334 * ib_cm_listen - Initiates listening on the specified service ID for 335 * connection and service ID resolution requests. 336 * @cm_id: Connection identifier associated with the listen request. 337 * @service_id: Service identifier matched against incoming connection 338 * and service ID resolution requests. The service ID should be specified 339 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 340 * assign a service ID to the caller. 341 * @service_mask: Mask applied to service ID used to listen across a 342 * range of service IDs. If set to 0, the service ID is matched 343 * exactly. This parameter is ignored if %service_id is set to 344 * IB_CM_ASSIGN_SERVICE_ID. 345 */ 346 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, 347 __be64 service_mask); 348 349 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 350 ib_cm_handler cm_handler, 351 __be64 service_id); 352 353 struct ib_cm_req_param { 354 struct sa_path_rec *primary_path; 355 struct sa_path_rec *alternate_path; 356 const struct ib_gid_attr *ppath_sgid_attr; 357 __be64 service_id; 358 u32 qp_num; 359 enum ib_qp_type qp_type; 360 u32 starting_psn; 361 const void *private_data; 362 u8 private_data_len; 363 u8 responder_resources; 364 u8 initiator_depth; 365 u8 remote_cm_response_timeout; 366 u8 flow_control; 367 u8 local_cm_response_timeout; 368 u8 retry_count; 369 u8 rnr_retry_count; 370 u8 max_cm_retries; 371 u8 srq; 372 }; 373 374 /** 375 * ib_send_cm_req - Sends a connection request to the remote node. 376 * @cm_id: Connection identifier that will be associated with the 377 * connection request. 378 * @param: Connection request information needed to establish the 379 * connection. 380 */ 381 int ib_send_cm_req(struct ib_cm_id *cm_id, 382 struct ib_cm_req_param *param); 383 384 struct ib_cm_rep_param { 385 u32 qp_num; 386 u32 starting_psn; 387 const void *private_data; 388 u8 private_data_len; 389 u8 responder_resources; 390 u8 initiator_depth; 391 u8 failover_accepted; 392 u8 flow_control; 393 u8 rnr_retry_count; 394 u8 srq; 395 }; 396 397 /** 398 * ib_send_cm_rep - Sends a connection reply in response to a connection 399 * request. 400 * @cm_id: Connection identifier that will be associated with the 401 * connection request. 402 * @param: Connection reply information needed to establish the 403 * connection. 404 */ 405 int ib_send_cm_rep(struct ib_cm_id *cm_id, 406 struct ib_cm_rep_param *param); 407 408 /** 409 * ib_send_cm_rtu - Sends a connection ready to use message in response 410 * to a connection reply message. 411 * @cm_id: Connection identifier associated with the connection request. 412 * @private_data: Optional user-defined private data sent with the 413 * ready to use message. 414 * @private_data_len: Size of the private data buffer, in bytes. 415 */ 416 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 417 const void *private_data, 418 u8 private_data_len); 419 420 /** 421 * ib_send_cm_dreq - Sends a disconnection request for an existing 422 * connection. 423 * @cm_id: Connection identifier associated with the connection being 424 * released. 425 * @private_data: Optional user-defined private data sent with the 426 * disconnection request message. 427 * @private_data_len: Size of the private data buffer, in bytes. 428 */ 429 int ib_send_cm_dreq(struct ib_cm_id *cm_id, 430 const void *private_data, 431 u8 private_data_len); 432 433 /** 434 * ib_send_cm_drep - Sends a disconnection reply to a disconnection request. 435 * @cm_id: Connection identifier associated with the connection being 436 * released. 437 * @private_data: Optional user-defined private data sent with the 438 * disconnection reply message. 439 * @private_data_len: Size of the private data buffer, in bytes. 440 * 441 * If the cm_id is in the correct state, the CM will transition the connection 442 * to the timewait state, even if an error occurs sending the DREP message. 443 */ 444 int ib_send_cm_drep(struct ib_cm_id *cm_id, 445 const void *private_data, 446 u8 private_data_len); 447 448 /** 449 * ib_cm_notify - Notifies the CM of an event reported to the consumer. 450 * @cm_id: Connection identifier to transition to established. 451 * @event: Type of event. 452 * 453 * This routine should be invoked by users to notify the CM of relevant 454 * communication events. Events that should be reported to the CM and 455 * when to report them are: 456 * 457 * IB_EVENT_COMM_EST - Used when a message is received on a connected 458 * QP before an RTU has been received. 459 * IB_EVENT_PATH_MIG - Notifies the CM that the connection has failed over 460 * to the alternate path. 461 */ 462 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event); 463 464 /** 465 * ib_send_cm_rej - Sends a connection rejection message to the 466 * remote node. 467 * @cm_id: Connection identifier associated with the connection being 468 * rejected. 469 * @reason: Reason for the connection request rejection. 470 * @ari: Optional additional rejection information. 471 * @ari_length: Size of the additional rejection information, in bytes. 472 * @private_data: Optional user-defined private data sent with the 473 * rejection message. 474 * @private_data_len: Size of the private data buffer, in bytes. 475 */ 476 int ib_send_cm_rej(struct ib_cm_id *cm_id, 477 enum ib_cm_rej_reason reason, 478 void *ari, 479 u8 ari_length, 480 const void *private_data, 481 u8 private_data_len); 482 483 #define IB_CM_MRA_FLAG_DELAY 0x80 /* Send MRA only after a duplicate msg */ 484 485 /** 486 * ib_send_cm_mra - Sends a message receipt acknowledgement to a connection 487 * message. 488 * @cm_id: Connection identifier associated with the connection message. 489 * @service_timeout: The lower 5-bits specify the maximum time required for 490 * the sender to reply to the connection message. The upper 3-bits 491 * specify additional control flags. 492 * @private_data: Optional user-defined private data sent with the 493 * message receipt acknowledgement. 494 * @private_data_len: Size of the private data buffer, in bytes. 495 */ 496 int ib_send_cm_mra(struct ib_cm_id *cm_id, 497 u8 service_timeout, 498 const void *private_data, 499 u8 private_data_len); 500 501 /** 502 * ib_cm_init_qp_attr - Initializes the QP attributes for use in transitioning 503 * to a specified QP state. 504 * @cm_id: Communication identifier associated with the QP attributes to 505 * initialize. 506 * @qp_attr: On input, specifies the desired QP state. On output, the 507 * mandatory and desired optional attributes will be set in order to 508 * modify the QP to the specified state. 509 * @qp_attr_mask: The QP attribute mask that may be used to transition the 510 * QP to the specified state. 511 * 512 * Users must set the @qp_attr->qp_state to the desired QP state. This call 513 * will set all required attributes for the given transition, along with 514 * known optional attributes. Users may override the attributes returned from 515 * this call before calling ib_modify_qp. 516 */ 517 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 518 struct ib_qp_attr *qp_attr, 519 int *qp_attr_mask); 520 521 struct ib_cm_sidr_req_param { 522 struct sa_path_rec *path; 523 const struct ib_gid_attr *sgid_attr; 524 __be64 service_id; 525 unsigned long timeout_ms; 526 const void *private_data; 527 u8 private_data_len; 528 u8 max_cm_retries; 529 }; 530 531 /** 532 * ib_send_cm_sidr_req - Sends a service ID resolution request to the 533 * remote node. 534 * @cm_id: Communication identifier that will be associated with the 535 * service ID resolution request. 536 * @param: Service ID resolution request information. 537 */ 538 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 539 struct ib_cm_sidr_req_param *param); 540 541 struct ib_cm_sidr_rep_param { 542 u32 qp_num; 543 u32 qkey; 544 enum ib_cm_sidr_status status; 545 const void *info; 546 u8 info_length; 547 const void *private_data; 548 u8 private_data_len; 549 }; 550 551 /** 552 * ib_send_cm_sidr_rep - Sends a service ID resolution reply to the 553 * remote node. 554 * @cm_id: Communication identifier associated with the received service ID 555 * resolution request. 556 * @param: Service ID resolution reply information. 557 */ 558 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 559 struct ib_cm_sidr_rep_param *param); 560 561 /** 562 * ibcm_reject_msg - return a pointer to a reject message string. 563 * @reason: Value returned in the REJECT event status field. 564 */ 565 const char *__attribute_const__ ibcm_reject_msg(int reason); 566 567 #endif /* IB_CM_H */ 568