ib_cm.h

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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.
 *
 * $Id: ib_cm.h 4311 2005-12-05 18:42:01Z sean.hefty $
 */
#if !defined(IB_CM_H)
#define IB_CM_H

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

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;
};

/**
 * 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 */
};

/**