/*
* 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 <linux/socket.h>
#include <linux/in6.h>
#include <rdma/ib_addr.h>
#include <rdma/ib_sa.h>
/*
* 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_ud_param {
const void *private_data;
u8 private_data_len;
struct ib_ah_attr ah_attr;
u32 qp_num;
u32 qkey;
};
struct rdma_cm_event {
enum rdma_cm_event_type event;
int status;
union {
struct rdma_conn_param conn;
struct rdma_ud_param ud;
} 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.
* @id: Connection identifier to connect.
* @conn_param: Connection information used for connected QPs.
*
* Users must have resolved a route for the rdma_cm_id to connect with
* by having called rdma_resolve_route before calling this routine.
*
* This call will either connect to a remote QP or obtain remote QP
* information for unconnected rdma_cm_id's. The actual operation is
* based on the rdma_cm_id's port space.
*/
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_notify - Notifies the RDMA CM of an asynchronous event that has
* occurred on the connection.
* @id: Connection identifier to transition to established.
* @event: Asynchronous event.
*
* This routine should be invoked by users to notify the CM of relevant
* communication events. Events that should be reported to the CM and
* when to report them are:
*
* IB_EVENT_COMM_EST - Used when a message is received on a connected
* QP before an RTU has been received.
*/
int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event);
/**
* 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 */
