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/*
* Copyright (c) 2005 Network Appliance, Inc. All rights reserved.
* Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef IW_CM_H
#define IW_CM_H

#include <linux/in.h>
#include <rdma/ib_cm.h>

struct iw_cm_id;

enum iw_cm_event_type {
IW_CM_EVENT_CONNECT_REQUEST = 1, /* connect request received */
IW_CM_EVENT_CONNECT_REPLY, /* reply from active connect request */
IW_CM_EVENT_ESTABLISHED, /* passive side accept successful */
IW_CM_EVENT_DISCONNECT, /* orderly shutdown */
IW_CM_EVENT_CLOSE /* close complete */
};

struct iw_cm_event {
enum iw_cm_event_type event;
int status;
struct sockaddr_in local_addr;
struct sockaddr_in remote_addr;
void *private_data;
void *provider_data;
u8 private_data_len;
u8 ord;
u8 ird;
};

/**
* iw_cm_handler - Function to be called by the IW CM when delivering events
* to the client.
*
* @cm_id: The IW CM identifier associated with the event.
* @event: Pointer to the event structure.
*/
typedef int (*iw_cm_handler)(struct iw_cm_id *cm_id,
struct iw_cm_event *event);

/**
* iw_event_handler - Function called by the provider when delivering provider
* events to the IW CM. Returns either 0 indicating the event was processed
* or -errno if the event could not be processed.
*
* @cm_id: The IW CM identifier associated with the event.
* @event: Pointer to the event structure.
*/
typedef int (*iw_event_handler)(struct iw_cm_id *cm_id,
struct iw_cm_event *event);

struct iw_cm_id {
iw_cm_handler cm_handler; /* client callback function */
void *context; /* client cb context */
struct ib_device *device;
struct sockaddr_in local_addr;
struct sockaddr_in remote_addr;
void *provider_data; /* provider private data */
iw_event_handler event_handler; /* cb for provider
events */
/* Used by provider to add and remove refs on IW cm_id */
void (*add_ref)(struct iw_cm_id *);
void (*rem_ref)(struct iw_cm_id *);
};

struct iw_cm_conn_param {
const void *private_data;
u16 private_data_len;
u32 ord;
u32 ird;
u32 qpn;
};

struct iw_cm_verbs {
void (*add_ref)(struct ib_qp *qp);

void (*rem_ref)(struct ib_qp *qp);

struct ib_qp * (*get_qp)(struct ib_device *device,
int qpn);

int (*connect)(struct iw_cm_id *cm_id,
struct iw_cm_conn_param *conn_param);

int (*accept)(struct iw_cm_id *cm_id,
struct iw_cm_conn_param *conn_param);

int (*reject)(struct iw_cm_id *cm_id,
const void *pdata, u8 pdata_len);

int (*create_listen)(struct iw_cm_id *cm_id,
int backlog);

int (*destroy_listen)(struct iw_cm_id *cm_id);
};

/**
* iw_create_cm_id - Create an IW CM identifier.
*
* @device: The IB device on which to create the IW CM identier.
* @event_handler: User callback invoked to report events associated with the
* returned IW CM identifier.
* @context: User specified context associated with the id.
*/
struct iw_cm_id *iw_create_cm_id(struct ib_device *device,
iw_cm_handler cm_handler, void *context);

/**
* iw_destroy_cm_id - Destroy an IW CM identifier.
*
* @cm_id: The previously created IW CM identifier to destroy.
*
* The client can assume that no events will be delivered for the CM ID after
* this function returns.
*/
void iw_destroy_cm_id(struct iw_cm_id *cm_id);

/**
* iw_cm_bind_qp - Unbind the specified IW CM identifier and QP
*
* @cm_id: The IW CM idenfier to unbind from the QP.
* @qp: The QP
*
* This is called by the provider when destroying the QP to ensure
* that any references held by the IWCM are released. It may also
* be called by the IWCM when destroying a CM_ID to that any
* references held by the provider are released.
*/
void iw_cm_unbind_qp(struct iw_cm_id *cm_id, struct ib_qp *qp);

/**
* iw_cm_get_qp - Return the ib_qp associated with a QPN
*
* @ib_device: The IB device
* @qpn: The queue pair number
*/
struct ib_qp *iw_cm_get_qp(struct ib_device *device, int qpn);

/**
* iw_cm_listen - Listen for incoming connection requests on the
* specified IW CM id.
*
* @cm_id: The IW CM identifier.
* @backlog: The maximum number of outstanding un-accepted inbound listen
* requests to queue.
*
* The source address and port number are specified in the IW CM identifier
* structure.
*/
int iw_cm_listen(struct iw_cm_id *cm_id, int backlog);

/**
* iw_cm_accept - Called to accept an incoming connect request.
*
* @cm_id: The IW CM identifier associated with the connection request.
* @iw_param: Pointer to a structure containing connection establishment
* parameters.
*
* The specified cm_id will have been provided in the event data for a
* CONNECT_REQUEST event. Subsequent events related to this connection will be
* delivered to the specified IW CM identifier prior and may occur prior to
* the return of this function. If this function returns a non-zero value, the
* client can assume that no events will be delivered to the specified IW CM
* identifier.
*/
int iw_cm_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param);

/**
* iw_cm_reject - Reject an incoming connection request.
*
* @cm_id: Connection identifier associated with the request.
* @private_daa: Pointer to data to deliver to the remote peer as part of the
* reject message.
* @private_data_len: The number of bytes in the private_data parameter.
*
* The client can assume that no events will be delivered to the specified IW
* CM identifier following the return of this function. The private_data
* buffer is available for reuse when this function returns.
*/
int iw_cm_reject(struct iw_cm_id *cm_id, const void *private_data,
u8 private_data_len);

/**
* iw_cm_connect - Called to request a connection to a remote peer.
*
* @cm_id: The IW CM identifier for the connection.
* @iw_param: Pointer to a structure containing connection establishment
* parameters.
*
* Events may be delivered to the specified IW CM identifier prior to the
* return of this function. If this function returns a non-zero value, the
* client can assume that no events will be delivered to the specified IW CM
* identifier.
*/
int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param);

/**
* iw_cm_disconnect - Close the specified connection.
*
* @cm_id: The IW CM identifier to close.
* @abrupt: If 0, the connection will be closed gracefully, otherwise, the
* connection will be reset.
*
* The IW CM identifier is still active until the IW_CM_EVENT_CLOSE event is
* delivered.
*/
int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt);

/**
* iw_cm_init_qp_attr - Called to initialize the attributes of the QP
* associated with a IW CM identifier.
*
* @cm_id: The IW CM identifier associated with the QP
* @qp_attr: Pointer to the QP attributes structure.
* @qp_attr_mask: Pointer to a bit vector specifying which QP attributes are
* valid.
*/
int iw_cm_init_qp_attr(struct iw_cm_id *cm_id, struct ib_qp_attr *qp_attr,
int *qp_attr_mask);

#endif /* IW_CM_H */
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