rdma_cm.h revision 331769
1/* 2 * Copyright (c) 2005 Voltaire Inc. All rights reserved. 3 * Copyright (c) 2005 Intel Corporation. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34#if !defined(RDMA_CM_H) 35#define RDMA_CM_H 36 37#include <linux/socket.h> 38#include <linux/in6.h> 39#include <rdma/ib_addr.h> 40#include <rdma/ib_sa.h> 41 42/* 43 * Upon receiving a device removal event, users must destroy the associated 44 * RDMA identifier and release all resources allocated with the device. 45 */ 46enum rdma_cm_event_type { 47 RDMA_CM_EVENT_ADDR_RESOLVED, 48 RDMA_CM_EVENT_ADDR_ERROR, 49 RDMA_CM_EVENT_ROUTE_RESOLVED, 50 RDMA_CM_EVENT_ROUTE_ERROR, 51 RDMA_CM_EVENT_CONNECT_REQUEST, 52 RDMA_CM_EVENT_CONNECT_RESPONSE, 53 RDMA_CM_EVENT_CONNECT_ERROR, 54 RDMA_CM_EVENT_UNREACHABLE, 55 RDMA_CM_EVENT_REJECTED, 56 RDMA_CM_EVENT_ESTABLISHED, 57 RDMA_CM_EVENT_DISCONNECTED, 58 RDMA_CM_EVENT_DEVICE_REMOVAL, 59 RDMA_CM_EVENT_MULTICAST_JOIN, 60 RDMA_CM_EVENT_MULTICAST_ERROR, 61 RDMA_CM_EVENT_ADDR_CHANGE, 62 RDMA_CM_EVENT_TIMEWAIT_EXIT 63}; 64 65const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event); 66 67enum rdma_port_space { 68 RDMA_PS_SDP = 0x0001, 69 RDMA_PS_IPOIB = 0x0002, 70 RDMA_PS_IB = 0x013F, 71 RDMA_PS_TCP = 0x0106, 72 RDMA_PS_UDP = 0x0111, 73}; 74 75#define RDMA_IB_IP_PS_MASK 0xFFFFFFFFFFFF0000ULL 76#define RDMA_IB_IP_PS_TCP 0x0000000001060000ULL 77#define RDMA_IB_IP_PS_UDP 0x0000000001110000ULL 78#define RDMA_IB_IP_PS_IB 0x00000000013F0000ULL 79 80struct rdma_addr { 81 struct sockaddr_storage src_addr; 82 struct sockaddr_storage dst_addr; 83 struct rdma_dev_addr dev_addr; 84}; 85 86struct rdma_route { 87 struct rdma_addr addr; 88 struct ib_sa_path_rec *path_rec; 89 int num_paths; 90}; 91 92struct rdma_conn_param { 93 const void *private_data; 94 u8 private_data_len; 95 u8 responder_resources; 96 u8 initiator_depth; 97 u8 flow_control; 98 u8 retry_count; /* ignored when accepting */ 99 u8 rnr_retry_count; 100 /* Fields below ignored if a QP is created on the rdma_cm_id. */ 101 u8 srq; 102 u32 qp_num; 103 u32 qkey; 104}; 105 106struct rdma_ud_param { 107 const void *private_data; 108 u8 private_data_len; 109 struct ib_ah_attr ah_attr; 110 u32 qp_num; 111 u32 qkey; 112}; 113 114struct rdma_cm_event { 115 enum rdma_cm_event_type event; 116 int status; 117 union { 118 struct rdma_conn_param conn; 119 struct rdma_ud_param ud; 120 } param; 121}; 122 123enum rdma_cm_state { 124 RDMA_CM_IDLE, 125 RDMA_CM_ADDR_QUERY, 126 RDMA_CM_ADDR_RESOLVED, 127 RDMA_CM_ROUTE_QUERY, 128 RDMA_CM_ROUTE_RESOLVED, 129 RDMA_CM_CONNECT, 130 RDMA_CM_DISCONNECT, 131 RDMA_CM_ADDR_BOUND, 132 RDMA_CM_LISTEN, 133 RDMA_CM_DEVICE_REMOVAL, 134 RDMA_CM_DESTROYING 135}; 136 137struct rdma_cm_id; 138 139/** 140 * rdma_cm_event_handler - Callback used to report user events. 141 * 142 * Notes: Users may not call rdma_destroy_id from this callback to destroy 143 * the passed in id, or a corresponding listen id. Returning a 144 * non-zero value from the callback will destroy the passed in id. 145 */ 146typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id, 147 struct rdma_cm_event *event); 148 149struct rdma_cm_id { 150 struct ib_device *device; 151 void *context; 152 struct ib_qp *qp; 153 rdma_cm_event_handler event_handler; 154 struct rdma_route route; 155 enum rdma_port_space ps; 156 enum ib_qp_type qp_type; 157 u8 port_num; 158}; 159 160/** 161 * rdma_create_id - Create an RDMA identifier. 162 * 163 * @net: The network namespace in which to create the new id. 164 * @event_handler: User callback invoked to report events associated with the 165 * returned rdma_id. 166 * @context: User specified context associated with the id. 167 * @ps: RDMA port space. 168 * @qp_type: type of queue pair associated with the id. 169 * 170 * The id holds a reference on the network namespace until it is destroyed. 171 */ 172struct rdma_cm_id *rdma_create_id(struct vnet *net, 173 rdma_cm_event_handler event_handler, 174 void *context, enum rdma_port_space ps, 175 enum ib_qp_type qp_type); 176 177/** 178 * rdma_destroy_id - Destroys an RDMA identifier. 179 * 180 * @id: RDMA identifier. 181 * 182 * Note: calling this function has the effect of canceling in-flight 183 * asynchronous operations associated with the id. 184 */ 185void rdma_destroy_id(struct rdma_cm_id *id); 186 187/** 188 * rdma_bind_addr - Bind an RDMA identifier to a source address and 189 * associated RDMA device, if needed. 190 * 191 * @id: RDMA identifier. 192 * @addr: Local address information. Wildcard values are permitted. 193 * 194 * This associates a source address with the RDMA identifier before calling 195 * rdma_listen. If a specific local address is given, the RDMA identifier will 196 * be bound to a local RDMA device. 197 */ 198int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr); 199 200/** 201 * rdma_resolve_addr - Resolve destination and optional source addresses 202 * from IP addresses to an RDMA address. If successful, the specified 203 * rdma_cm_id will be bound to a local device. 204 * 205 * @id: RDMA identifier. 206 * @src_addr: Source address information. This parameter may be NULL. 207 * @dst_addr: Destination address information. 208 * @timeout_ms: Time to wait for resolution to complete. 209 */ 210int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr, 211 struct sockaddr *dst_addr, int timeout_ms); 212 213/** 214 * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier 215 * into route information needed to establish a connection. 216 * 217 * This is called on the client side of a connection. 218 * Users must have first called rdma_resolve_addr to resolve a dst_addr 219 * into an RDMA address before calling this routine. 220 */ 221int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms); 222 223/** 224 * rdma_create_qp - Allocate a QP and associate it with the specified RDMA 225 * identifier. 226 * 227 * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA 228 * through their states. 229 */ 230int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd, 231 struct ib_qp_init_attr *qp_init_attr); 232 233/** 234 * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA 235 * identifier. 236 * 237 * Users must destroy any QP associated with an RDMA identifier before 238 * destroying the RDMA ID. 239 */ 240void rdma_destroy_qp(struct rdma_cm_id *id); 241 242/** 243 * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning 244 * to a specified QP state. 245 * @id: Communication identifier associated with the QP attributes to 246 * initialize. 247 * @qp_attr: On input, specifies the desired QP state. On output, the 248 * mandatory and desired optional attributes will be set in order to 249 * modify the QP to the specified state. 250 * @qp_attr_mask: The QP attribute mask that may be used to transition the 251 * QP to the specified state. 252 * 253 * Users must set the @qp_attr->qp_state to the desired QP state. This call 254 * will set all required attributes for the given transition, along with 255 * known optional attributes. Users may override the attributes returned from 256 * this call before calling ib_modify_qp. 257 * 258 * Users that wish to have their QP automatically transitioned through its 259 * states can associate a QP with the rdma_cm_id by calling rdma_create_qp(). 260 */ 261int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr, 262 int *qp_attr_mask); 263 264/** 265 * rdma_connect - Initiate an active connection request. 266 * @id: Connection identifier to connect. 267 * @conn_param: Connection information used for connected QPs. 268 * 269 * Users must have resolved a route for the rdma_cm_id to connect with 270 * by having called rdma_resolve_route before calling this routine. 271 * 272 * This call will either connect to a remote QP or obtain remote QP 273 * information for unconnected rdma_cm_id's. The actual operation is 274 * based on the rdma_cm_id's port space. 275 */ 276int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param); 277 278/** 279 * rdma_listen - This function is called by the passive side to 280 * listen for incoming connection requests. 281 * 282 * Users must have bound the rdma_cm_id to a local address by calling 283 * rdma_bind_addr before calling this routine. 284 */ 285int rdma_listen(struct rdma_cm_id *id, int backlog); 286 287/** 288 * rdma_accept - Called to accept a connection request or response. 289 * @id: Connection identifier associated with the request. 290 * @conn_param: Information needed to establish the connection. This must be 291 * provided if accepting a connection request. If accepting a connection 292 * response, this parameter must be NULL. 293 * 294 * Typically, this routine is only called by the listener to accept a connection 295 * request. It must also be called on the active side of a connection if the 296 * user is performing their own QP transitions. 297 * 298 * In the case of error, a reject message is sent to the remote side and the 299 * state of the qp associated with the id is modified to error, such that any 300 * previously posted receive buffers would be flushed. 301 */ 302int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param); 303 304/** 305 * rdma_notify - Notifies the RDMA CM of an asynchronous event that has 306 * occurred on the connection. 307 * @id: Connection identifier to transition to established. 308 * @event: Asynchronous event. 309 * 310 * This routine should be invoked by users to notify the CM of relevant 311 * communication events. Events that should be reported to the CM and 312 * when to report them are: 313 * 314 * IB_EVENT_COMM_EST - Used when a message is received on a connected 315 * QP before an RTU has been received. 316 */ 317int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event); 318 319/** 320 * rdma_reject - Called to reject a connection request or response. 321 */ 322int rdma_reject(struct rdma_cm_id *id, const void *private_data, 323 u8 private_data_len); 324 325/** 326 * rdma_disconnect - This function disconnects the associated QP and 327 * transitions it into the error state. 328 */ 329int rdma_disconnect(struct rdma_cm_id *id); 330 331/** 332 * rdma_join_multicast - Join the multicast group specified by the given 333 * address. 334 * @id: Communication identifier associated with the request. 335 * @addr: Multicast address identifying the group to join. 336 * @join_state: Multicast JoinState bitmap requested by port. 337 * Bitmap is based on IB_SA_MCMEMBER_REC_JOIN_STATE bits. 338 * @context: User-defined context associated with the join request, returned 339 * to the user through the private_data pointer in multicast events. 340 */ 341int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr, 342 u8 join_state, void *context); 343 344/** 345 * rdma_leave_multicast - Leave the multicast group specified by the given 346 * address. 347 */ 348void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr); 349 350/** 351 * rdma_set_service_type - Set the type of service associated with a 352 * connection identifier. 353 * @id: Communication identifier to associated with service type. 354 * @tos: Type of service. 355 * 356 * The type of service is interpretted as a differentiated service 357 * field (RFC 2474). The service type should be specified before 358 * performing route resolution, as existing communication on the 359 * connection identifier may be unaffected. The type of service 360 * requested may not be supported by the network to all destinations. 361 */ 362void rdma_set_service_type(struct rdma_cm_id *id, int tos); 363 364/** 365 * rdma_set_reuseaddr - Allow the reuse of local addresses when binding 366 * the rdma_cm_id. 367 * @id: Communication identifier to configure. 368 * @reuse: Value indicating if the bound address is reusable. 369 * 370 * Reuse must be set before an address is bound to the id. 371 */ 372int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse); 373 374/** 375 * rdma_set_afonly - Specify that listens are restricted to the 376 * bound address family only. 377 * @id: Communication identifer to configure. 378 * @afonly: Value indicating if listens are restricted. 379 * 380 * Must be set before identifier is in the listening state. 381 */ 382int rdma_set_afonly(struct rdma_cm_id *id, int afonly); 383 384 /** 385 * rdma_get_service_id - Return the IB service ID for a specified address. 386 * @id: Communication identifier associated with the address. 387 * @addr: Address for the service ID. 388 */ 389__be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr); 390 391#endif /* RDMA_CM_H */ 392