text: /*
   * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   * Copyright (c) 2005 Voltaire, 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 IB_USER_MAD_H
  #define IB_USER_MAD_H
  
  #include <linux/types.h>
  #include <linux/ioctl.h>
  
  /*
   * Increment this value if any changes that break userspace ABI
   * compatibility are made.
   */
  #define IB_USER_MAD_ABI_VERSION	5
  
  /*
   * Make sure that all structs defined in this file remain laid out so
   * that they pack the same way on 32-bit and 64-bit architectures (to
   * avoid incompatibility between 32-bit userspace and 64-bit kernels).
   */
  
  /**
   * ib_user_mad_hdr_old - Old version of MAD packet header without pkey_index
   * @id - ID of agent MAD received with/to be sent with
   * @status - 0 on successful receive, ETIMEDOUT if no response
   *   received (transaction ID in data[] will be set to TID of original
   *   request) (ignored on send)
   * @timeout_ms - Milliseconds to wait for response (unset on receive)
   * @retries - Number of automatic retries to attempt
   * @qpn - Remote QP number received from/to be sent to
   * @qkey - Remote Q_Key to be sent with (unset on receive)
   * @lid - Remote lid received from/to be sent to
   * @sl - Service level received with/to be sent with
   * @path_bits - Local path bits received with/to be sent with
   * @grh_present - If set, GRH was received/should be sent
   * @gid_index - Local GID index to send with (unset on receive)
   * @hop_limit - Hop limit in GRH
   * @traffic_class - Traffic class in GRH
   * @gid - Remote GID in GRH
   * @flow_label - Flow label in GRH
   */
  struct ib_user_mad_hdr_old {
  	__u32	id;
  	__u32	status;
  	__u32	timeout_ms;
  	__u32	retries;
  	__u32	length;
  	__be32	qpn;
  	__be32  qkey;
  	__be16	lid;
  	__u8	sl;
  	__u8	path_bits;
  	__u8	grh_present;
  	__u8	gid_index;
  	__u8	hop_limit;
  	__u8	traffic_class;
  	__u8	gid[16];
  	__be32	flow_label;
  };
  
  /**
   * ib_user_mad_hdr - MAD packet header
   *   This layout allows specifying/receiving the P_Key index.  To use
   *   this capability, an application must call the
   *   IB_USER_MAD_ENABLE_PKEY ioctl on the user MAD file handle before
   *   any other actions with the file handle.
   * @id - ID of agent MAD received with/to be sent with
   * @status - 0 on successful receive, ETIMEDOUT if no response
   *   received (transaction ID in data[] will be set to TID of original
   *   request) (ignored on send)
   * @timeout_ms - Milliseconds to wait for response (unset on receive)
   * @retries - Number of automatic retries to attempt
   * @qpn - Remote QP number received from/to be sent to
   * @qkey - Remote Q_Key to be sent with (unset on receive)
   * @lid - Remote lid received from/to be sent to
   * @sl - Service level received with/to be sent with
   * @path_bits - Local path bits received with/to be sent with
   * @grh_present - If set, GRH was received/should be sent
   * @gid_index - Local GID index to send with (unset on receive)
   * @hop_limit - Hop limit in GRH
   * @traffic_class - Traffic class in GRH
   * @gid - Remote GID in GRH
   * @flow_label - Flow label in GRH
   * @pkey_index - P_Key index
   */
  struct ib_user_mad_hdr {
  	__u32	id;
  	__u32	status;
  	__u32	timeout_ms;
  	__u32	retries;
  	__u32	length;
  	__be32	qpn;
  	__be32  qkey;
  	__be16	lid;
  	__u8	sl;
  	__u8	path_bits;
  	__u8	grh_present;
  	__u8	gid_index;
  	__u8	hop_limit;
  	__u8	traffic_class;
  	__u8	gid[16];
  	__be32	flow_label;
  	__u16	pkey_index;
  	__u8	reserved[6];
  };
  
  /**
   * ib_user_mad - MAD packet
   * @hdr - MAD packet header
   * @data - Contents of MAD
   *
   */
  struct ib_user_mad {
  	struct ib_user_mad_hdr hdr;
  	__u64	data[0];
  };
  
  /*
   * Earlier versions of this interface definition declared the
   * method_mask[] member as an array of __u32 but treated it as a
   * bitmap made up of longs in the kernel.  This ambiguity meant that
   * 32-bit big-endian applications that can run on both 32-bit and
   * 64-bit kernels had no consistent ABI to rely on, and 64-bit
   * big-endian applications that treated method_mask as being made up
   * of 32-bit words would have their bitmap misinterpreted.
   *
   * To clear up this confusion, we change the declaration of
   * method_mask[] to use unsigned long and handle the conversion from
   * 32-bit userspace to 64-bit kernel for big-endian systems in the
   * compat_ioctl method.  Unfortunately, to keep the structure layout
   * the same, we need the method_mask[] array to be aligned only to 4
   * bytes even when long is 64 bits, which forces us into this ugly
   * typedef.
   */
  typedef unsigned long __attribute__((aligned(4))) packed_ulong;
  #define IB_USER_MAD_LONGS_PER_METHOD_MASK (128 / (8 * sizeof (long)))
  
  /**
   * ib_user_mad_reg_req - MAD registration request
   * @id - Set by the kernel; used to identify agent in future requests.
   * @qpn - Queue pair number; must be 0 or 1.
   * @method_mask - The caller will receive unsolicited MADs for any method
   *   where @method_mask = 1.
   * @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.
   * @rmpp_version: If set, indicates the RMPP version used.
   *
   */
  struct ib_user_mad_reg_req {
  	__u32	id;
  	packed_ulong method_mask[IB_USER_MAD_LONGS_PER_METHOD_MASK];
  	__u8	qpn;
  	__u8	mgmt_class;
  	__u8	mgmt_class_version;
  	__u8    oui[3];
  	__u8	rmpp_version;
  };
  
  #define IB_IOCTL_MAGIC		0x1b
  
  #define IB_USER_MAD_REGISTER_AGENT	_IO(IB_IOCTL_MAGIC, 1)
  
  #define IB_USER_MAD_UNREGISTER_AGENT	_IO(IB_IOCTL_MAGIC, 2)
  
  #define IB_USER_MAD_ENABLE_PKEY		_IO(IB_IOCTL_MAGIC, 3)
  
  #endif /* IB_USER_MAD_H */
  