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/*
* Copyright (c) 2004, 2005 Intel Corporation. All rights reserved.
* Copyright (c) 2004 Topspin Corporation. All rights reserved.
* Copyright (c) 2004 Voltaire Corporation. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, 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.
*/
#if !defined(IB_CM_H)
#define IB_CM_H

#include <rdma/ib_mad.h>
#include <rdma/ib_sa.h>

/* ib_cm and ib_user_cm modules share /sys/class/infiniband_cm */
extern struct class cm_class;

enum ib_cm_state {
IB_CM_IDLE,
IB_CM_LISTEN,
IB_CM_REQ_SENT,
IB_CM_REQ_RCVD,
IB_CM_MRA_REQ_SENT,
IB_CM_MRA_REQ_RCVD,
IB_CM_REP_SENT,
IB_CM_REP_RCVD,
IB_CM_MRA_REP_SENT,
IB_CM_MRA_REP_RCVD,
IB_CM_ESTABLISHED,
IB_CM_DREQ_SENT,
IB_CM_DREQ_RCVD,
IB_CM_TIMEWAIT,
IB_CM_SIDR_REQ_SENT,
IB_CM_SIDR_REQ_RCVD
};

enum ib_cm_lap_state {
IB_CM_LAP_UNINIT,
IB_CM_LAP_IDLE,
IB_CM_LAP_SENT,
IB_CM_LAP_RCVD,
IB_CM_MRA_LAP_SENT,
IB_CM_MRA_LAP_RCVD,
};

enum ib_cm_event_type {
IB_CM_REQ_ERROR,
IB_CM_REQ_RECEIVED,
IB_CM_REP_ERROR,
IB_CM_REP_RECEIVED,
IB_CM_RTU_RECEIVED,
IB_CM_USER_ESTABLISHED,
IB_CM_DREQ_ERROR,
IB_CM_DREQ_RECEIVED,
IB_CM_DREP_RECEIVED,
IB_CM_TIMEWAIT_EXIT,
IB_CM_MRA_RECEIVED,
IB_CM_REJ_RECEIVED,
IB_CM_LAP_ERROR,
IB_CM_LAP_RECEIVED,
IB_CM_APR_RECEIVED,
IB_CM_SIDR_REQ_ERROR,
IB_CM_SIDR_REQ_RECEIVED,
IB_CM_SIDR_REP_RECEIVED
};

enum ib_cm_data_size {
IB_CM_REQ_PRIVATE_DATA_SIZE = 92,
IB_CM_MRA_PRIVATE_DATA_SIZE = 222,
IB_CM_REJ_PRIVATE_DATA_SIZE = 148,
IB_CM_REP_PRIVATE_DATA_SIZE = 196,
IB_CM_RTU_PRIVATE_DATA_SIZE = 224,
IB_CM_DREQ_PRIVATE_DATA_SIZE = 220,
IB_CM_DREP_PRIVATE_DATA_SIZE = 224,
IB_CM_REJ_ARI_LENGTH = 72,
IB_CM_LAP_PRIVATE_DATA_SIZE = 168,
IB_CM_APR_PRIVATE_DATA_SIZE = 148,
IB_CM_APR_INFO_LENGTH = 72,
IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE = 216,
IB_CM_SIDR_REP_PRIVATE_DATA_SIZE = 136,
IB_CM_SIDR_REP_INFO_LENGTH = 72,
IB_CM_COMPARE_SIZE = 64
};

struct ib_cm_id;

struct ib_cm_req_event_param {
struct ib_cm_id *listen_id;
u8 port;

struct ib_sa_path_rec *primary_path;
struct ib_sa_path_rec *alternate_path;

__be64 remote_ca_guid;
u32 remote_qkey;
u32 remote_qpn;
enum ib_qp_type qp_type;

u32 starting_psn;
u8 responder_resources;
u8 initiator_depth;
unsigned int local_cm_response_timeout:5;
unsigned int flow_control:1;
unsigned int remote_cm_response_timeout:5;
unsigned int retry_count:3;
unsigned int rnr_retry_count:3;
unsigned int srq:1;
};

struct ib_cm_rep_event_param {
__be64 remote_ca_guid;
u32 remote_qkey;
u32 remote_qpn;
u32 starting_psn;
u8 responder_resources;
u8 initiator_depth;
unsigned int target_ack_delay:5;
unsigned int failover_accepted:2;
unsigned int flow_control:1;
unsigned int rnr_retry_count:3;
unsigned int srq:1;
};

enum ib_cm_rej_reason {
IB_CM_REJ_NO_QP = 1,
IB_CM_REJ_NO_EEC = 2,
IB_CM_REJ_NO_RESOURCES = 3,
IB_CM_REJ_TIMEOUT = 4,
IB_CM_REJ_UNSUPPORTED = 5,
IB_CM_REJ_INVALID_COMM_ID = 6,
IB_CM_REJ_INVALID_COMM_INSTANCE = 7,
IB_CM_REJ_INVALID_SERVICE_ID = 8,
IB_CM_REJ_INVALID_TRANSPORT_TYPE = 9,
IB_CM_REJ_STALE_CONN = 10,
IB_CM_REJ_RDC_NOT_EXIST = 11,
IB_CM_REJ_INVALID_GID = 12,
IB_CM_REJ_INVALID_LID = 13,
IB_CM_REJ_INVALID_SL = 14,
IB_CM_REJ_INVALID_TRAFFIC_CLASS = 15,
IB_CM_REJ_INVALID_HOP_LIMIT = 16,
IB_CM_REJ_INVALID_PACKET_RATE = 17,
IB_CM_REJ_INVALID_ALT_GID = 18,
IB_CM_REJ_INVALID_ALT_LID = 19,
IB_CM_REJ_INVALID_ALT_SL = 20,
IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS = 21,
IB_CM_REJ_INVALID_ALT_HOP_LIMIT = 22,
IB_CM_REJ_INVALID_ALT_PACKET_RATE = 23,
IB_CM_REJ_PORT_CM_REDIRECT = 24,
IB_CM_REJ_PORT_REDIRECT = 25,
IB_CM_REJ_INVALID_MTU = 26,
IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES = 27,
IB_CM_REJ_CONSUMER_DEFINED = 28,
IB_CM_REJ_INVALID_RNR_RETRY = 29,
IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID = 30,
IB_CM_REJ_INVALID_CLASS_VERSION = 31,
IB_CM_REJ_INVALID_FLOW_LABEL = 32,
IB_CM_REJ_INVALID_ALT_FLOW_LABEL = 33
};

struct ib_cm_rej_event_param {
enum ib_cm_rej_reason reason;
void *ari;
u8 ari_length;
};

struct ib_cm_mra_event_param {
u8 service_timeout;
};

struct ib_cm_lap_event_param {
struct ib_sa_path_rec *alternate_path;
};

enum ib_cm_apr_status {
IB_CM_APR_SUCCESS,
IB_CM_APR_INVALID_COMM_ID,
IB_CM_APR_UNSUPPORTED,
IB_CM_APR_REJECT,
IB_CM_APR_REDIRECT,
IB_CM_APR_IS_CURRENT,
IB_CM_APR_INVALID_QPN_EECN,
IB_CM_APR_INVALID_LID,
IB_CM_APR_INVALID_GID,
IB_CM_APR_INVALID_FLOW_LABEL,
IB_CM_APR_INVALID_TCLASS,
IB_CM_APR_INVALID_HOP_LIMIT,
IB_CM_APR_INVALID_PACKET_RATE,
IB_CM_APR_INVALID_SL
};

struct ib_cm_apr_event_param {
enum ib_cm_apr_status ap_status;
void *apr_info;
u8 info_len;
};

struct ib_cm_sidr_req_event_param {
struct ib_cm_id *listen_id;
u8 port;
u16 pkey;
};

enum ib_cm_sidr_status {
IB_SIDR_SUCCESS,
IB_SIDR_UNSUPPORTED,
IB_SIDR_REJECT,
IB_SIDR_NO_QP,
IB_SIDR_REDIRECT,
IB_SIDR_UNSUPPORTED_VERSION
};

struct ib_cm_sidr_rep_event_param {
enum ib_cm_sidr_status status;
u32 qkey;
u32 qpn;
void *info;
u8 info_len;
};

struct ib_cm_event {
enum ib_cm_event_type event;
union {
struct ib_cm_req_event_param req_rcvd;
struct ib_cm_rep_event_param rep_rcvd;
/* No data for RTU received events. */
struct ib_cm_rej_event_param rej_rcvd;
struct ib_cm_mra_event_param mra_rcvd;
struct ib_cm_lap_event_param lap_rcvd;
struct ib_cm_apr_event_param apr_rcvd;
/* No data for DREQ/DREP received events. */
struct ib_cm_sidr_req_event_param sidr_req_rcvd;
struct ib_cm_sidr_rep_event_param sidr_rep_rcvd;
enum ib_wc_status send_status;
} param;

void *private_data;
};

#define CM_REQ_ATTR_ID cpu_to_be16(0x0010)
#define CM_MRA_ATTR_ID cpu_to_be16(0x0011)
#define CM_REJ_ATTR_ID cpu_to_be16(0x0012)
#define CM_REP_ATTR_ID cpu_to_be16(0x0013)
#define CM_RTU_ATTR_ID cpu_to_be16(0x0014)
#define CM_DREQ_ATTR_ID cpu_to_be16(0x0015)
#define CM_DREP_ATTR_ID cpu_to_be16(0x0016)
#define CM_SIDR_REQ_ATTR_ID cpu_to_be16(0x0017)
#define CM_SIDR_REP_ATTR_ID cpu_to_be16(0x0018)
#define CM_LAP_ATTR_ID cpu_to_be16(0x0019)
#define CM_APR_ATTR_ID cpu_to_be16(0x001A)

/**
* ib_cm_handler - User-defined callback to process communication events.
* @cm_id: Communication identifier associated with the reported event.
* @event: Information about the communication event.
*
* IB_CM_REQ_RECEIVED and IB_CM_SIDR_REQ_RECEIVED communication events
* generated as a result of listen requests result in the allocation of a
* new @cm_id. The new @cm_id is returned to the user through this callback.
* Clients are responsible for destroying the new @cm_id. For peer-to-peer
* IB_CM_REQ_RECEIVED and all other events, the returned @cm_id corresponds
* to a user's existing communication identifier.
*
* Users may not call ib_destroy_cm_id while in the context of this callback;
* however, returning a non-zero value instructs the communication manager to
* destroy the @cm_id after the callback completes.
*/
typedef int (*ib_cm_handler)(struct ib_cm_id *cm_id,
struct ib_cm_event *event);

struct ib_cm_id {
ib_cm_handler cm_handler;
void *context;
struct ib_device *device;
__be64 service_id;
__be64 service_mask;
enum ib_cm_state state; /* internal CM/debug use */
enum ib_cm_lap_state lap_state; /* internal CM/debug use */
__be32 local_id;
__be32 remote_id;
u32 remote_cm_qpn; /* 1 unless redirected */
};

/**
* ib_create_cm_id - Allocate a communication identifier.
* @device: Device associated with the cm_id. All related communication will
* be associated with the specified device.
* @cm_handler: Callback invoked to notify the user of CM events.
* @context: User specified context associated with the communication
* identifier.
*
* Communication identifiers are used to track connection states, service
* ID resolution requests, and listen requests.
*/
struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
ib_cm_handler cm_handler,
void *context);

/**
* ib_destroy_cm_id - Destroy a connection identifier.
* @cm_id: Connection identifier to destroy.
*
* This call blocks until the connection identifier is destroyed.
*/
void ib_destroy_cm_id(struct ib_cm_id *cm_id);

#define IB_SERVICE_ID_AGN_MASK cpu_to_be64(0xFF00000000000000ULL)
#define IB_CM_ASSIGN_SERVICE_ID cpu_to_be64(0x0200000000000000ULL)
#define IB_CMA_SERVICE_ID cpu_to_be64(0x0000000001000000ULL)
#define IB_CMA_SERVICE_ID_MASK cpu_to_be64(0xFFFFFFFFFF000000ULL)
#define IB_SDP_SERVICE_ID cpu_to_be64(0x0000000000010000ULL)
#define IB_SDP_SERVICE_ID_MASK cpu_to_be64(0xFFFFFFFFFFFF0000ULL)

struct ib_cm_compare_data {
u8 data[IB_CM_COMPARE_SIZE];
u8 mask[IB_CM_COMPARE_SIZE];
};

/**
* ib_cm_listen - Initiates listening on the specified service ID for
* connection and service ID resolution requests.
* @cm_id: Connection identifier associated with the listen request.
* @service_id: Service identifier matched against incoming connection
* and service ID resolution requests. The service ID should be specified
* network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
* assign a service ID to the caller.
* @service_mask: Mask applied to service ID used to listen across a
* range of service IDs. If set to 0, the service ID is matched
* exactly. This parameter is ignored if %service_id is set to
* IB_CM_ASSIGN_SERVICE_ID.
* @compare_data: This parameter is optional. It specifies data that must
* appear in the private data of a connection request for the specified
* listen request.
*/
int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
struct ib_cm_compare_data *compare_data);

struct ib_cm_req_param {
struct ib_sa_path_rec *primary_path;
struct ib_sa_path_rec *alternate_path;
__be64 service_id;
u32 qp_num;
enum ib_qp_type qp_type;
u32 starting_psn;
const void *private_data;
u8 private_data_len;
u8 peer_to_peer;
u8 responder_resources;
u8 initiator_depth;
u8 remote_cm_response_timeout;
u8 flow_control;
u8 local_cm_response_timeout;
u8 retry_count;
u8 rnr_retry_count;
u8 max_cm_retries;
u8 srq;
};

/**
* ib_send_cm_req - Sends a connection request to the remote node.
* @cm_id: Connection identifier that will be associated with the
* connection request.
* @param: Connection request information needed to establish the
* connection.
*/
int ib_send_cm_req(struct ib_cm_id *cm_id,
struct ib_cm_req_param *param);

struct ib_cm_rep_param {
u32 qp_num;
u32 starting_psn;
const void *private_data;
u8 private_data_len;
u8 responder_resources;
u8 initiator_depth;
u8 failover_accepted;
u8 flow_control;
u8 rnr_retry_count;
u8 srq;
};

/**
* ib_send_cm_rep - Sends a connection reply in response to a connection
* request.
* @cm_id: Connection identifier that will be associated with the
* connection request.
* @param: Connection reply information needed to establish the
* connection.
*/
int ib_send_cm_rep(struct ib_cm_id *cm_id,
struct ib_cm_rep_param *param);

/**
* ib_send_cm_rtu - Sends a connection ready to use message in response
* to a connection reply message.
* @cm_id: Connection identifier associated with the connection request.
* @private_data: Optional user-defined private data sent with the
* ready to use message.
* @private_data_len: Size of the private data buffer, in bytes.
*/
int ib_send_cm_rtu(struct ib_cm_id *cm_id,
const void *private_data,
u8 private_data_len);

/**
* ib_send_cm_dreq - Sends a disconnection request for an existing
* connection.
* @cm_id: Connection identifier associated with the connection being
* released.
* @private_data: Optional user-defined private data sent with the
* disconnection request message.
* @private_data_len: Size of the private data buffer, in bytes.
*/
int ib_send_cm_dreq(struct ib_cm_id *cm_id,
const void *private_data,
u8 private_data_len);

/**
* ib_send_cm_drep - Sends a disconnection reply to a disconnection request.
* @cm_id: Connection identifier associated with the connection being
* released.
* @private_data: Optional user-defined private data sent with the
* disconnection reply message.
* @private_data_len: Size of the private data buffer, in bytes.
*
* If the cm_id is in the correct state, the CM will transition the connection
* to the timewait state, even if an error occurs sending the DREP message.
*/
int ib_send_cm_drep(struct ib_cm_id *cm_id,
const void *private_data,
u8 private_data_len);

/**
* ib_cm_notify - Notifies the CM of an event reported to the consumer.
* @cm_id: Connection identifier to transition to established.
* @event: Type of 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.
* IB_EVENT_PATH_MIG - Notifies the CM that the connection has failed over
* to the alternate path.
*/
int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event);

/**
* ib_send_cm_rej - Sends a connection rejection message to the
* remote node.
* @cm_id: Connection identifier associated with the connection being
* rejected.
* @reason: Reason for the connection request rejection.
* @ari: Optional additional rejection information.
* @ari_length: Size of the additional rejection information, in bytes.
* @private_data: Optional user-defined private data sent with the
* rejection message.
* @private_data_len: Size of the private data buffer, in bytes.
*/
int ib_send_cm_rej(struct ib_cm_id *cm_id,
enum ib_cm_rej_reason reason,
void *ari,
u8 ari_length,
const void *private_data,
u8 private_data_len);

#define IB_CM_MRA_FLAG_DELAY 0x80 /* Send MRA only after a duplicate msg */

/**
* ib_send_cm_mra - Sends a message receipt acknowledgement to a connection
* message.
* @cm_id: Connection identifier associated with the connection message.
* @service_timeout: The lower 5-bits specify the maximum time required for
* the sender to reply to the connection message. The upper 3-bits
* specify additional control flags.
* @private_data: Optional user-defined private data sent with the
* message receipt acknowledgement.
* @private_data_len: Size of the private data buffer, in bytes.
*/
int ib_send_cm_mra(struct ib_cm_id *cm_id,
u8 service_timeout,
const void *private_data,
u8 private_data_len);

/**
* ib_send_cm_lap - Sends a load alternate path request.
* @cm_id: Connection identifier associated with the load alternate path
* message.
* @alternate_path: A path record that identifies the alternate path to
* load.
* @private_data: Optional user-defined private data sent with the
* load alternate path message.
* @private_data_len: Size of the private data buffer, in bytes.
*/
int ib_send_cm_lap(struct ib_cm_id *cm_id,
struct ib_sa_path_rec *alternate_path,
const void *private_data,
u8 private_data_len);

/**
* ib_cm_init_qp_attr - Initializes the QP attributes for use in transitioning
* to a specified QP state.
* @cm_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.
*/
int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
struct ib_qp_attr *qp_attr,
int *qp_attr_mask);

/**
* ib_send_cm_apr - Sends an alternate path response message in response to
* a load alternate path request.
* @cm_id: Connection identifier associated with the alternate path response.
* @status: Reply status sent with the alternate path response.
* @info: Optional additional information sent with the alternate path
* response.
* @info_length: Size of the additional information, in bytes.
* @private_data: Optional user-defined private data sent with the
* alternate path response message.
* @private_data_len: Size of the private data buffer, in bytes.
*/
int ib_send_cm_apr(struct ib_cm_id *cm_id,
enum ib_cm_apr_status status,
void *info,
u8 info_length,
const void *private_data,
u8 private_data_len);

struct ib_cm_sidr_req_param {
struct ib_sa_path_rec *path;
__be64 service_id;
int timeout_ms;
const void *private_data;
u8 private_data_len;
u8 max_cm_retries;
};

/**
* ib_send_cm_sidr_req - Sends a service ID resolution request to the
* remote node.
* @cm_id: Communication identifier that will be associated with the
* service ID resolution request.
* @param: Service ID resolution request information.
*/
int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
struct ib_cm_sidr_req_param *param);

struct ib_cm_sidr_rep_param {
u32 qp_num;
u32 qkey;
enum ib_cm_sidr_status status;
const void *info;
u8 info_length;
const void *private_data;
u8 private_data_len;
};

/**
* ib_send_cm_sidr_rep - Sends a service ID resolution reply to the
* remote node.
* @cm_id: Communication identifier associated with the received service ID
* resolution request.
* @param: Service ID resolution reply information.
*/
int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
struct ib_cm_sidr_rep_param *param);

#endif /* IB_CM_H */
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