/*
   * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
   * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
   * Copyright (c) 2004 Intel Corporation.  All rights reserved.
   * Copyright (c) 2004 Topspin Corporation.  All rights reserved.

   * Copyright (c) 2004-2006 Voltaire Corporation.  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_mad.h 5596 2006-03-03 01:00:07Z sean.hefty $

   */
  
  #if !defined( IB_MAD_H )
  #define IB_MAD_H

  #include <rdma/ib_verbs.h>

  
  /* Management base version */
  #define IB_MGMT_BASE_VERSION			1
  
  /* Management classes */
  #define IB_MGMT_CLASS_SUBN_LID_ROUTED		0x01
  #define IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE	0x81
  #define IB_MGMT_CLASS_SUBN_ADM			0x03
  #define IB_MGMT_CLASS_PERF_MGMT			0x04
  #define IB_MGMT_CLASS_BM			0x05
  #define IB_MGMT_CLASS_DEVICE_MGMT		0x06
  #define IB_MGMT_CLASS_CM			0x07
  #define IB_MGMT_CLASS_SNMP			0x08

  #define IB_MGMT_CLASS_DEVICE_ADM		0x10
  #define IB_MGMT_CLASS_BOOT_MGMT			0x11
  #define IB_MGMT_CLASS_BIS			0x12
  #define IB_MGMT_CLASS_CONG_MGMT			0x21

  #define IB_MGMT_CLASS_VENDOR_RANGE2_START	0x30
  #define IB_MGMT_CLASS_VENDOR_RANGE2_END		0x4F

  #define	IB_OPENIB_OUI				(0x001405)

  /* Management methods */
  #define IB_MGMT_METHOD_GET			0x01
  #define IB_MGMT_METHOD_SET			0x02
  #define IB_MGMT_METHOD_GET_RESP			0x81
  #define IB_MGMT_METHOD_SEND			0x03
  #define IB_MGMT_METHOD_TRAP			0x05
  #define IB_MGMT_METHOD_REPORT			0x06
  #define IB_MGMT_METHOD_REPORT_RESP		0x86
  #define IB_MGMT_METHOD_TRAP_REPRESS		0x07
  
  #define IB_MGMT_METHOD_RESP			0x80

  #define IB_BM_ATTR_MOD_RESP			cpu_to_be32(1)

  
  #define IB_MGMT_MAX_METHODS			128

  /* RMPP information */
  #define IB_MGMT_RMPP_VERSION			1
  
  #define IB_MGMT_RMPP_TYPE_DATA			1
  #define IB_MGMT_RMPP_TYPE_ACK			2
  #define IB_MGMT_RMPP_TYPE_STOP			3
  #define IB_MGMT_RMPP_TYPE_ABORT			4
  
  #define IB_MGMT_RMPP_FLAG_ACTIVE		1
  #define IB_MGMT_RMPP_FLAG_FIRST			(1<<1)
  #define IB_MGMT_RMPP_FLAG_LAST			(1<<2)
  
  #define IB_MGMT_RMPP_NO_RESPTIME		0x1F
  
  #define	IB_MGMT_RMPP_STATUS_SUCCESS		0
  #define	IB_MGMT_RMPP_STATUS_RESX		1

  #define	IB_MGMT_RMPP_STATUS_ABORT_MIN		118

  #define	IB_MGMT_RMPP_STATUS_T2L			118
  #define	IB_MGMT_RMPP_STATUS_BAD_LEN		119
  #define	IB_MGMT_RMPP_STATUS_BAD_SEG		120
  #define	IB_MGMT_RMPP_STATUS_BADT		121
  #define	IB_MGMT_RMPP_STATUS_W2S			122
  #define	IB_MGMT_RMPP_STATUS_S2B			123
  #define	IB_MGMT_RMPP_STATUS_BAD_STATUS		124
  #define	IB_MGMT_RMPP_STATUS_UNV			125
  #define	IB_MGMT_RMPP_STATUS_TMR			126
  #define	IB_MGMT_RMPP_STATUS_UNSPEC		127

  #define	IB_MGMT_RMPP_STATUS_ABORT_MAX		127

  #define IB_QP0		0
  #define IB_QP1		__constant_htonl(1)
  #define IB_QP1_QKEY	0x80010000

  #define IB_QP_SET_QKEY	0x80000000

  #define IB_DEFAULT_PKEY_PARTIAL 0x7FFF
  #define IB_DEFAULT_PKEY_FULL	0xFFFF

  enum {

  	IB_MGMT_MAD_HDR = 24,

  	IB_MGMT_MAD_DATA = 232,

  	IB_MGMT_RMPP_HDR = 36,

  	IB_MGMT_RMPP_DATA = 220,

  	IB_MGMT_VENDOR_HDR = 40,

  	IB_MGMT_VENDOR_DATA = 216,

  	IB_MGMT_SA_HDR = 56,
  	IB_MGMT_SA_DATA = 200,

  	IB_MGMT_DEVICE_HDR = 64,
  	IB_MGMT_DEVICE_DATA = 192,

  };

  struct ib_mad_hdr {
  	u8	base_version;
  	u8	mgmt_class;
  	u8	class_version;
  	u8	method;

  	__be16	status;
  	__be16	class_specific;
  	__be64	tid;
  	__be16	attr_id;
  	__be16	resv;
  	__be32	attr_mod;

  };

  
  struct ib_rmpp_hdr {
  	u8	rmpp_version;
  	u8	rmpp_type;
  	u8	rmpp_rtime_flags;
  	u8	rmpp_status;

  	__be32	seg_num;
  	__be32	paylen_newwin;

  };
  
  typedef u64 __bitwise ib_sa_comp_mask;
  
  #define IB_SA_COMP_MASK(n) ((__force ib_sa_comp_mask) cpu_to_be64(1ull << n))
  
  /*
   * ib_sa_hdr and ib_sa_mad structures must be packed because they have
   * 64-bit fields that are only 32-bit aligned. 64-bit architectures will
   * lay them out wrong otherwise.  (And unfortunately they are sent on
   * the wire so we can't change the layout)
   */
  struct ib_sa_hdr {

  	__be64			sm_key;
  	__be16			attr_offset;
  	__be16			reserved;

  	ib_sa_comp_mask		comp_mask;

  } __attribute__ ((packed));
  
  struct ib_mad {
  	struct ib_mad_hdr	mad_hdr;

  	u8			data[IB_MGMT_MAD_DATA];

  };

  
  struct ib_rmpp_mad {
  	struct ib_mad_hdr	mad_hdr;
  	struct ib_rmpp_hdr	rmpp_hdr;

  	u8			data[IB_MGMT_RMPP_DATA];

  };
  
  struct ib_sa_mad {
  	struct ib_mad_hdr	mad_hdr;
  	struct ib_rmpp_hdr	rmpp_hdr;
  	struct ib_sa_hdr	sa_hdr;

  	u8			data[IB_MGMT_SA_DATA];

  } __attribute__ ((packed));
  
  struct ib_vendor_mad {
  	struct ib_mad_hdr	mad_hdr;
  	struct ib_rmpp_hdr	rmpp_hdr;
  	u8			reserved;
  	u8			oui[3];

  	u8			data[IB_MGMT_VENDOR_DATA];

  };

  struct ib_class_port_info
  {
  	u8			base_version;
  	u8			class_version;
  	__be16			capability_mask;
  	u8			reserved[3];
  	u8			resp_time_value;
  	u8			redirect_gid[16];
  	__be32			redirect_tcslfl;
  	__be16			redirect_lid;
  	__be16			redirect_pkey;
  	__be32			redirect_qp;
  	__be32			redirect_qkey;
  	u8			trap_gid[16];
  	__be32			trap_tcslfl;
  	__be16			trap_lid;
  	__be16			trap_pkey;
  	__be32			trap_hlqp;
  	__be32			trap_qkey;
  };

  /**
   * ib_mad_send_buf - MAD data buffer and work request for sends.

   * @next: A pointer used to chain together MADs for posting.

   * @mad: References an allocated MAD data buffer for MADs that do not have
   *   RMPP active.  For MADs using RMPP, references the common and management
   *   class specific headers.

   * @mad_agent: MAD agent that allocated the buffer.

   * @ah: The address handle to use when sending the MAD.

   * @context: User-controlled context fields.

   * @hdr_len: Indicates the size of the data header of the MAD.  This length
   *   includes the common MAD, RMPP, and class specific headers.
   * @data_len: Indicates the total size of user-transferred data.
   * @seg_count: The number of RMPP segments allocated for this send.
   * @seg_size: Size of each RMPP segment.

   * @timeout_ms: Time to wait for a response.
   * @retries: Number of times to retry a request for a response.

   *
   * Users are responsible for initializing the MAD buffer itself, with the

   * exception of any RMPP header.  Additional segment buffer space allocated
   * beyond data_len is padding.

   */
  struct ib_mad_send_buf {

  	struct ib_mad_send_buf	*next;
  	void			*mad;

  	struct ib_mad_agent	*mad_agent;

  	struct ib_ah		*ah;

  	void			*context[2];

  	int			hdr_len;
  	int			data_len;
  	int			seg_count;
  	int			seg_size;

  	int			timeout_ms;
  	int			retries;

  };

  /**

   * ib_response_mad - Returns if the specified MAD has been generated in
   *   response to a sent request or trap.
   */
  int ib_response_mad(struct ib_mad *mad);
  
  /**

   * ib_get_rmpp_resptime - Returns the RMPP response time.
   * @rmpp_hdr: An RMPP header.
   */
  static inline u8 ib_get_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr)
  {
  	return rmpp_hdr->rmpp_rtime_flags >> 3;
  }
  
  /**
   * ib_get_rmpp_flags - Returns the RMPP flags.
   * @rmpp_hdr: An RMPP header.
   */
  static inline u8 ib_get_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr)
  {
  	return rmpp_hdr->rmpp_rtime_flags & 0x7;
  }
  
  /**
   * ib_set_rmpp_resptime - Sets the response time in an RMPP header.
   * @rmpp_hdr: An RMPP header.
   * @rtime: The response time to set.
   */
  static inline void ib_set_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr, u8 rtime)
  {
  	rmpp_hdr->rmpp_rtime_flags = ib_get_rmpp_flags(rmpp_hdr) | (rtime << 3);
  }
  
  /**
   * ib_set_rmpp_flags - Sets the flags in an RMPP header.
   * @rmpp_hdr: An RMPP header.
   * @flags: The flags to set.
   */
  static inline void ib_set_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr, u8 flags)
  {
  	rmpp_hdr->rmpp_rtime_flags = (rmpp_hdr->rmpp_rtime_flags & 0xF1) |
  				     (flags & 0x7);
  }

  struct ib_mad_agent;
  struct ib_mad_send_wc;
  struct ib_mad_recv_wc;
  
  /**
   * ib_mad_send_handler - callback handler for a sent MAD.
   * @mad_agent: MAD agent that sent the MAD.
   * @mad_send_wc: Send work completion information on the sent MAD.
   */
  typedef void (*ib_mad_send_handler)(struct ib_mad_agent *mad_agent,
  				    struct ib_mad_send_wc *mad_send_wc);
  
  /**
   * ib_mad_snoop_handler - Callback handler for snooping sent MADs.
   * @mad_agent: MAD agent that snooped the MAD.
   * @send_wr: Work request information on the sent MAD.
   * @mad_send_wc: Work completion information on the sent MAD.  Valid
   *   only for snooping that occurs on a send completion.
   *
   * Clients snooping MADs should not modify data referenced by the @send_wr
   * or @mad_send_wc.
   */
  typedef void (*ib_mad_snoop_handler)(struct ib_mad_agent *mad_agent,

  				     struct ib_mad_send_buf *send_buf,

  				     struct ib_mad_send_wc *mad_send_wc);
  
  /**
   * ib_mad_recv_handler - callback handler for a received MAD.
   * @mad_agent: MAD agent requesting the received MAD.
   * @mad_recv_wc: Received work completion information on the received MAD.
   *
   * MADs received in response to a send request operation will be handed to

   * the user before the send operation completes.  All data buffers given

   * to registered agents through this routine are owned by the receiving
   * client, except for snooping agents.  Clients snooping MADs should not
   * modify the data referenced by @mad_recv_wc.
   */
  typedef void (*ib_mad_recv_handler)(struct ib_mad_agent *mad_agent,
  				    struct ib_mad_recv_wc *mad_recv_wc);
  
  /**
   * ib_mad_agent - Used to track MAD registration with the access layer.
   * @device: Reference to device registration is on.
   * @qp: Reference to QP used for sending and receiving MADs.

   * @mr: Memory region for system memory usable for DMA.

   * @recv_handler: Callback handler for a received MAD.
   * @send_handler: Callback handler for a sent MAD.
   * @snoop_handler: Callback handler for snooped sent MADs.
   * @context: User-specified context associated with this registration.
   * @hi_tid: Access layer assigned transaction ID for this client.
   *   Unsolicited MADs sent by this client will have the upper 32-bits
   *   of their TID set to this value.
   * @port_num: Port number on which QP is registered

   * @rmpp_version: If set, indicates the RMPP version used by this agent.

   */
  struct ib_mad_agent {
  	struct ib_device	*device;
  	struct ib_qp		*qp;

  	struct ib_mr		*mr;

  	ib_mad_recv_handler	recv_handler;
  	ib_mad_send_handler	send_handler;
  	ib_mad_snoop_handler	snoop_handler;
  	void			*context;
  	u32			hi_tid;
  	u8			port_num;

  	u8			rmpp_version;

  };
  
  /**
   * ib_mad_send_wc - MAD send completion information.

   * @send_buf: Send MAD data buffer associated with the send MAD request.

   * @status: Completion status.
   * @vendor_err: Optional vendor error information returned with a failed
   *   request.
   */
  struct ib_mad_send_wc {

  	struct ib_mad_send_buf	*send_buf;

  	enum ib_wc_status	status;
  	u32			vendor_err;
  };
  
  /**
   * ib_mad_recv_buf - received MAD buffer information.
   * @list: Reference to next data buffer for a received RMPP MAD.
   * @grh: References a data buffer containing the global route header.
   *   The data refereced by this buffer is only valid if the GRH is
   *   valid.
   * @mad: References the start of the received MAD.
   */
  struct ib_mad_recv_buf {
  	struct list_head	list;
  	struct ib_grh		*grh;
  	struct ib_mad		*mad;
  };
  
  /**
   * ib_mad_recv_wc - received MAD information.
   * @wc: Completion information for the received data.
   * @recv_buf: Specifies the location of the received data buffer(s).

   * @rmpp_list: Specifies a list of RMPP reassembled received MAD buffers.

   * @mad_len: The length of the received MAD, without duplicated headers.
   *

   * For received response, the wr_id contains a pointer to the ib_mad_send_buf

   *   for the corresponding send request.
   */
  struct ib_mad_recv_wc {
  	struct ib_wc		*wc;
  	struct ib_mad_recv_buf	recv_buf;

  	struct list_head	rmpp_list;

  	int			mad_len;
  };
  
  /**
   * ib_mad_reg_req - MAD registration request
   * @mgmt_class: Indicates which management class of MADs should be receive
   *   by the caller.  This field is only required if the user wishes to
   *   receive unsolicited MADs, otherwise it should be 0.
   * @mgmt_class_version: Indicates which version of MADs for the given
   *   management class to receive.
   * @oui: Indicates IEEE OUI when mgmt_class is a vendor class
   *   in the range from 0x30 to 0x4f. Otherwise not used.
   * @method_mask: The caller will receive unsolicited MADs for any method
   *   where @method_mask = 1.
   */
  struct ib_mad_reg_req {
  	u8	mgmt_class;
  	u8	mgmt_class_version;
  	u8	oui[3];
  	DECLARE_BITMAP(method_mask, IB_MGMT_MAX_METHODS);
  };
  
  /**
   * ib_register_mad_agent - Register to send/receive MADs.
   * @device: The device to register with.
   * @port_num: The port on the specified device to use.
   * @qp_type: Specifies which QP to access.  Must be either
   *   IB_QPT_SMI or IB_QPT_GSI.
   * @mad_reg_req: Specifies which unsolicited MADs should be received
   *   by the caller.  This parameter may be NULL if the caller only
   *   wishes to receive solicited responses.
   * @rmpp_version: If set, indicates that the client will send
   *   and receive MADs that contain the RMPP header for the given version.
   *   If set to 0, indicates that RMPP is not used by this client.
   * @send_handler: The completion callback routine invoked after a send
   *   request has completed.
   * @recv_handler: The completion callback routine invoked for a received
   *   MAD.
   * @context: User specified context associated with the registration.
   */
  struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
  					   u8 port_num,
  					   enum ib_qp_type qp_type,
  					   struct ib_mad_reg_req *mad_reg_req,
  					   u8 rmpp_version,
  					   ib_mad_send_handler send_handler,
  					   ib_mad_recv_handler recv_handler,
  					   void *context);
  
  enum ib_mad_snoop_flags {
  	/*IB_MAD_SNOOP_POSTED_SENDS	   = 1,*/
  	/*IB_MAD_SNOOP_RMPP_SENDS	   = (1<<1),*/
  	IB_MAD_SNOOP_SEND_COMPLETIONS	   = (1<<2),
  	/*IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS = (1<<3),*/
  	IB_MAD_SNOOP_RECVS		   = (1<<4)
  	/*IB_MAD_SNOOP_RMPP_RECVS	   = (1<<5),*/
  	/*IB_MAD_SNOOP_REDIRECTED_QPS	   = (1<<6)*/
  };
  
  /**
   * ib_register_mad_snoop - Register to snoop sent and received MADs.
   * @device: The device to register with.
   * @port_num: The port on the specified device to use.
   * @qp_type: Specifies which QP traffic to snoop.  Must be either
   *   IB_QPT_SMI or IB_QPT_GSI.
   * @mad_snoop_flags: Specifies information where snooping occurs.
   * @send_handler: The callback routine invoked for a snooped send.
   * @recv_handler: The callback routine invoked for a snooped receive.
   * @context: User specified context associated with the registration.
   */
  struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
  					   u8 port_num,
  					   enum ib_qp_type qp_type,
  					   int mad_snoop_flags,
  					   ib_mad_snoop_handler snoop_handler,
  					   ib_mad_recv_handler recv_handler,
  					   void *context);
  
  /**
   * ib_unregister_mad_agent - Unregisters a client from using MAD services.
   * @mad_agent: Corresponding MAD registration request to deregister.
   *
   * After invoking this routine, MAD services are no longer usable by the
   * client on the associated QP.
   */
  int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent);
  
  /**
   * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
   *   with the registered client.

   * @send_buf: Specifies the information needed to send the MAD(s).
   * @bad_send_buf: Specifies the MAD on which an error was encountered.  This
   *   parameter is optional if only a single MAD is posted.

   *
   * Sent MADs are not guaranteed to complete in the order that they were posted.

   *
   * If the MAD requires RMPP, the data buffer should contain a single copy
   * of the common MAD, RMPP, and class specific headers, followed by the class
   * defined data.  If the class defined data would not divide evenly into
   * RMPP segments, then space must be allocated at the end of the referenced
   * buffer for any required padding.  To indicate the amount of class defined
   * data being transferred, the paylen_newwin field in the RMPP header should
   * be set to the size of the class specific header plus the amount of class
   * defined data being transferred.  The paylen_newwin field should be
   * specified in network-byte order.

   */

  int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
  		     struct ib_mad_send_buf **bad_send_buf);

  
  /**

   * ib_free_recv_mad - Returns data buffers used to receive a MAD.

   * @mad_recv_wc: Work completion information for a received MAD.
   *
   * Clients receiving MADs through their ib_mad_recv_handler must call this
   * routine to return the work completion buffers to the access layer.
   */
  void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc);
  
  /**
   * ib_cancel_mad - Cancels an outstanding send MAD operation.
   * @mad_agent: Specifies the registration associated with sent MAD.

   * @send_buf: Indicates the MAD to cancel.

   *
   * MADs will be returned to the user through the corresponding
   * ib_mad_send_handler.
   */

  void ib_cancel_mad(struct ib_mad_agent *mad_agent,
  		   struct ib_mad_send_buf *send_buf);

  
  /**
   * ib_modify_mad - Modifies an outstanding send MAD operation.
   * @mad_agent: Specifies the registration associated with sent MAD.

   * @send_buf: Indicates the MAD to modify.

   * @timeout_ms: New timeout value for sent MAD.
   *
   * This call will reset the timeout value for a sent MAD to the specified
   * value.
   */

  int ib_modify_mad(struct ib_mad_agent *mad_agent,
  		  struct ib_mad_send_buf *send_buf, u32 timeout_ms);

  
  /**
   * ib_redirect_mad_qp - Registers a QP for MAD services.
   * @qp: Reference to a QP that requires MAD services.
   * @rmpp_version: If set, indicates that the client will send
   *   and receive MADs that contain the RMPP header for the given version.
   *   If set to 0, indicates that RMPP is not used by this client.
   * @send_handler: The completion callback routine invoked after a send
   *   request has completed.
   * @recv_handler: The completion callback routine invoked for a received
   *   MAD.
   * @context: User specified context associated with the registration.
   *
   * Use of this call allows clients to use MAD services, such as RMPP,
   * on user-owned QPs.  After calling this routine, users may send
   * MADs on the specified QP by calling ib_mad_post_send.
   */
  struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
  					u8 rmpp_version,
  					ib_mad_send_handler send_handler,
  					ib_mad_recv_handler recv_handler,
  					void *context);
  
  /**
   * ib_process_mad_wc - Processes a work completion associated with a
   *   MAD sent or received on a redirected QP.
   * @mad_agent: Specifies the registered MAD service using the redirected QP.
   * @wc: References a work completion associated with a sent or received
   *   MAD segment.
   *
   * This routine is used to complete or continue processing on a MAD request.
   * If the work completion is associated with a send operation, calling
   * this routine is required to continue an RMPP transfer or to wait for a
   * corresponding response, if it is a request.  If the work completion is
   * associated with a receive operation, calling this routine is required to
   * process an inbound or outbound RMPP transfer, or to match a response MAD
   * with its corresponding request.
   */
  int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
  		      struct ib_wc *wc);

  /**
   * ib_create_send_mad - Allocate and initialize a data buffer and work request
   *   for sending a MAD.
   * @mad_agent: Specifies the registered MAD service to associate with the MAD.
   * @remote_qpn: Specifies the QPN of the receiving node.
   * @pkey_index: Specifies which PKey the MAD will be sent using.  This field
   *   is valid only if the remote_qpn is QP 1.

   * @rmpp_active: Indicates if the send will enable RMPP.

   * @hdr_len: Indicates the size of the data header of the MAD.  This length
   *   should include the common MAD header, RMPP header, plus any class
   *   specific header.

   * @data_len: Indicates the size of any user-transferred data.  The call will

   *   automatically adjust the allocated buffer size to account for any
   *   additional padding that may be necessary.
   * @gfp_mask: GFP mask used for the memory allocation.
   *

   * This routine allocates a MAD for sending.  The returned MAD send buffer
   * will reference a data buffer usable for sending a MAD, along

   * with an initialized work request structure.  Users may modify the returned

   * MAD data buffer before posting the send.

   *

   * The returned MAD header, class specific headers, and any padding will be
   * cleared.  Users are responsible for initializing the common MAD header,
   * any class specific header, and MAD data area.
   * If @rmpp_active is set, the RMPP header will be initialized for sending.

   */
  struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
  					    u32 remote_qpn, u16 pkey_index,

  					    int rmpp_active,

  					    int hdr_len, int data_len,

  					    gfp_t gfp_mask);

  
  /**

   * ib_is_mad_class_rmpp - returns whether given management class
   * supports RMPP.
   * @mgmt_class: management class
   *
   * This routine returns whether the management class supports RMPP.
   */
  int ib_is_mad_class_rmpp(u8 mgmt_class);
  
  /**
   * ib_get_mad_data_offset - returns the data offset for a given
   * management class.
   * @mgmt_class: management class
   *
   * This routine returns the data offset in the MAD for the management
   * class requested.
   */
  int ib_get_mad_data_offset(u8 mgmt_class);
  
  /**

   * ib_get_rmpp_segment - returns the data buffer for a given RMPP segment.
   * @send_buf: Previously allocated send data buffer.
   * @seg_num: number of segment to return
   *
   * This routine returns a pointer to the data buffer of an RMPP MAD.
   * Users must provide synchronization to @send_buf around this call.
   */
  void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num);
  
  /**

   * ib_free_send_mad - Returns data buffers used to send a MAD.
   * @send_buf: Previously allocated send data buffer.
   */
  void ib_free_send_mad(struct ib_mad_send_buf *send_buf);

  #endif /* IB_MAD_H */