/* * Copyright (c) 2005 Voltaire Inc. All rights reserved. * Copyright (c) 2005 Intel Corporation. All rights reserved. * * This Software is licensed under one of the following licenses: * * 1) under the terms of the "Common Public License 1.0" a copy of which is * available from the Open Source Initiative, see * http://www.opensource.org/licenses/cpl.php. * * 2) under the terms of the "The BSD License" a copy of which is * available from the Open Source Initiative, see * http://www.opensource.org/licenses/bsd-license.php. * * 3) under the terms of the "GNU General Public License (GPL) Version 2" a * copy of which is available from the Open Source Initiative, see * http://www.opensource.org/licenses/gpl-license.php. * * Licensee has the right to choose one of the above licenses. * * Redistributions of source code must retain the above copyright * notice and one of the license notices. * * Redistributions in binary form must reproduce both the above copyright * notice, one of the license notices in the documentation * and/or other materials provided with the distribution. * */ #if !defined(RDMA_CM_H) #define RDMA_CM_H #include #include #include #include /* * Upon receiving a device removal event, users must destroy the associated * RDMA identifier and release all resources allocated with the device. */ enum rdma_cm_event_type { RDMA_CM_EVENT_ADDR_RESOLVED, RDMA_CM_EVENT_ADDR_ERROR, RDMA_CM_EVENT_ROUTE_RESOLVED, RDMA_CM_EVENT_ROUTE_ERROR, RDMA_CM_EVENT_CONNECT_REQUEST, RDMA_CM_EVENT_CONNECT_RESPONSE, RDMA_CM_EVENT_CONNECT_ERROR, RDMA_CM_EVENT_UNREACHABLE, RDMA_CM_EVENT_REJECTED, RDMA_CM_EVENT_ESTABLISHED, RDMA_CM_EVENT_DISCONNECTED, RDMA_CM_EVENT_DEVICE_REMOVAL, }; enum rdma_port_space { RDMA_PS_SDP = 0x0001, RDMA_PS_TCP = 0x0106, RDMA_PS_UDP = 0x0111, RDMA_PS_SCTP = 0x0183 }; struct rdma_addr { struct sockaddr src_addr; u8 src_pad[sizeof(struct sockaddr_in6) - sizeof(struct sockaddr)]; struct sockaddr dst_addr; u8 dst_pad[sizeof(struct sockaddr_in6) - sizeof(struct sockaddr)]; struct rdma_dev_addr dev_addr; }; struct rdma_route { struct rdma_addr addr; struct ib_sa_path_rec *path_rec; int num_paths; }; struct rdma_conn_param { const void *private_data; u8 private_data_len; u8 responder_resources; u8 initiator_depth; u8 flow_control; u8 retry_count; /* ignored when accepting */ u8 rnr_retry_count; /* Fields below ignored if a QP is created on the rdma_cm_id. */ u8 srq; u32 qp_num; }; struct rdma_cm_event { enum rdma_cm_event_type event; int status; union { struct rdma_conn_param conn; } param; }; struct rdma_cm_id; /** * rdma_cm_event_handler - Callback used to report user events. * * Notes: Users may not call rdma_destroy_id from this callback to destroy * the passed in id, or a corresponding listen id. Returning a * non-zero value from the callback will destroy the passed in id. */ typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id, struct rdma_cm_event *event); struct rdma_cm_id { struct ib_device *device; void *context; struct ib_qp *qp; rdma_cm_event_handler event_handler; struct rdma_route route; enum rdma_port_space ps; u8 port_num; }; /** * rdma_create_id - Create an RDMA identifier. * * @event_handler: User callback invoked to report events associated with the * returned rdma_id. * @context: User specified context associated with the id. * @ps: RDMA port space. */ struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler, void *context, enum rdma_port_space ps); /** * rdma_destroy_id - Destroys an RDMA identifier. * * @id: RDMA identifier. * * Note: calling this function has the effect of canceling in-flight * asynchronous operations associated with the id. */ void rdma_destroy_id(struct rdma_cm_id *id); /** * rdma_bind_addr - Bind an RDMA identifier to a source address and * associated RDMA device, if needed. * * @id: RDMA identifier. * @addr: Local address information. Wildcard values are permitted. * * This associates a source address with the RDMA identifier before calling * rdma_listen. If a specific local address is given, the RDMA identifier will * be bound to a local RDMA device. */ int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr); /** * rdma_resolve_addr - Resolve destination and optional source addresses * from IP addresses to an RDMA address. If successful, the specified * rdma_cm_id will be bound to a local device. * * @id: RDMA identifier. * @src_addr: Source address information. This parameter may be NULL. * @dst_addr: Destination address information. * @timeout_ms: Time to wait for resolution to complete. */ int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr, struct sockaddr *dst_addr, int timeout_ms); /** * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier * into route information needed to establish a connection. * * This is called on the client side of a connection. * Users must have first called rdma_resolve_addr to resolve a dst_addr * into an RDMA address before calling this routine. */ int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms); /** * rdma_create_qp - Allocate a QP and associate it with the specified RDMA * identifier. * * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA * through their states. */ int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd, struct ib_qp_init_attr *qp_init_attr); /** * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA * identifier. * * Users must destroy any QP associated with an RDMA identifier before * destroying the RDMA ID. */ void rdma_destroy_qp(struct rdma_cm_id *id); /** * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning * to a specified QP state. * @id: Communication identifier associated with the QP attributes to * initialize. * @qp_attr: On input, specifies the desired QP state. On output, the * mandatory and desired optional attributes will be set in order to * modify the QP to the specified state. * @qp_attr_mask: The QP attribute mask that may be used to transition the * QP to the specified state. * * Users must set the @qp_attr->qp_state to the desired QP state. This call * will set all required attributes for the given transition, along with * known optional attributes. Users may override the attributes returned from * this call before calling ib_modify_qp. * * Users that wish to have their QP automatically transitioned through its * states can associate a QP with the rdma_cm_id by calling rdma_create_qp(). */ int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr, int *qp_attr_mask); /** * rdma_connect - Initiate an active connection request. * * Users must have resolved a route for the rdma_cm_id to connect with * by having called rdma_resolve_route before calling this routine. */ int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param); /** * rdma_listen - This function is called by the passive side to * listen for incoming connection requests. * * Users must have bound the rdma_cm_id to a local address by calling * rdma_bind_addr before calling this routine. */ int rdma_listen(struct rdma_cm_id *id, int backlog); /** * rdma_accept - Called to accept a connection request or response. * @id: Connection identifier associated with the request. * @conn_param: Information needed to establish the connection. This must be * provided if accepting a connection request. If accepting a connection * response, this parameter must be NULL. * * Typically, this routine is only called by the listener to accept a connection * request. It must also be called on the active side of a connection if the * user is performing their own QP transitions. * * In the case of error, a reject message is sent to the remote side and the * state of the qp associated with the id is modified to error, such that any * previously posted receive buffers would be flushed. */ int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param); /** * rdma_reject - Called to reject a connection request or response. */ int rdma_reject(struct rdma_cm_id *id, const void *private_data, u8 private_data_len); /** * rdma_disconnect - This function disconnects the associated QP and * transitions it into the error state. */ int rdma_disconnect(struct rdma_cm_id *id); #endif /* RDMA_CM_H */