include/rdma/ib_user_mad.h

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #ifndef IB_USER_MAD_H
  35 #define IB_USER_MAD_H
  36
  37 #include <linux/types.h>
  38 #include <linux/ioctl.h>
  39
  40 /*
  41  * Increment this value if any changes that break userspace ABI
  42  * compatibility are made.
  43  */
  44 #define IB_USER_MAD_ABI_VERSION 5
  45
  46 /*
  47  * Make sure that all structs defined in this file remain laid out so
  48  * that they pack the same way on 32-bit and 64-bit architectures (to
  49  * avoid incompatibility between 32-bit userspace and 64-bit kernels).
  50  */
  51
  52 /**
  53  * ib_user_mad_hdr_old - Old version of MAD packet header without pkey_index
  54  * @id - ID of agent MAD received with/to be sent with
  55  * @status - 0 on successful receive, ETIMEDOUT if no response
  56  *   received (transaction ID in data[] will be set to TID of original
  57  *   request) (ignored on send)
  58  * @timeout_ms - Milliseconds to wait for response (unset on receive)
  59  * @retries - Number of automatic retries to attempt
  60  * @qpn - Remote QP number received from/to be sent to
  61  * @qkey - Remote Q_Key to be sent with (unset on receive)
  62  * @lid - Remote lid received from/to be sent to
  63  * @sl - Service level received with/to be sent with
  64  * @path_bits - Local path bits received with/to be sent with
  65  * @grh_present - If set, GRH was received/should be sent
  66  * @gid_index - Local GID index to send with (unset on receive)
  67  * @hop_limit - Hop limit in GRH
  68  * @traffic_class - Traffic class in GRH
  69  * @gid - Remote GID in GRH
  70  * @flow_label - Flow label in GRH
  71  */
  72 struct ib_user_mad_hdr_old {
  73         __u32   id;
  74         __u32   status;
  75         __u32   timeout_ms;
  76         __u32   retries;
  77         __u32   length;
  78         __be32  qpn;
  79         __be32  qkey;
  80         __be16  lid;
  81         __u8    sl;
  82         __u8    path_bits;
  83         __u8    grh_present;
  84         __u8    gid_index;
  85         __u8    hop_limit;
  86         __u8    traffic_class;
  87         __u8    gid[16];
  88         __be32  flow_label;
  89 };
  90
  91 /**
  92  * ib_user_mad_hdr - MAD packet header
  93  *   This layout allows specifying/receiving the P_Key index.  To use
  94  *   this capability, an application must call the
  95  *   IB_USER_MAD_ENABLE_PKEY ioctl on the user MAD file handle before
  96  *   any other actions with the file handle.
  97  * @id - ID of agent MAD received with/to be sent with
  98  * @status - 0 on successful receive, ETIMEDOUT if no response
  99  *   received (transaction ID in data[] will be set to TID of original
 100  *   request) (ignored on send)
 101  * @timeout_ms - Milliseconds to wait for response (unset on receive)
 102  * @retries - Number of automatic retries to attempt
 103  * @qpn - Remote QP number received from/to be sent to
 104  * @qkey - Remote Q_Key to be sent with (unset on receive)
 105  * @lid - Remote lid received from/to be sent to
 106  * @sl - Service level received with/to be sent with
 107  * @path_bits - Local path bits received with/to be sent with
 108  * @grh_present - If set, GRH was received/should be sent
 109  * @gid_index - Local GID index to send with (unset on receive)
 110  * @hop_limit - Hop limit in GRH
 111  * @traffic_class - Traffic class in GRH
 112  * @gid - Remote GID in GRH
 113  * @flow_label - Flow label in GRH
 114  * @pkey_index - P_Key index
 115  */
 116 struct ib_user_mad_hdr {
 117         __u32   id;
 118         __u32   status;
 119         __u32   timeout_ms;
 120         __u32   retries;
 121         __u32   length;
 122         __be32  qpn;
 123         __be32  qkey;
 124         __be16  lid;
 125         __u8    sl;
 126         __u8    path_bits;
 127         __u8    grh_present;
 128         __u8    gid_index;
 129         __u8    hop_limit;
 130         __u8    traffic_class;
 131         __u8    gid[16];
 132         __be32  flow_label;
 133         __u16   pkey_index;
 134         __u8    reserved[6];
 135 };
 136
 137 /**
 138  * ib_user_mad - MAD packet
 139  * @hdr - MAD packet header
 140  * @data - Contents of MAD
 141  *
 142  */
 143 struct ib_user_mad {
 144         struct ib_user_mad_hdr hdr;
 145         __u64   data[0];
 146 };
 147
 148 /*
 149  * Earlier versions of this interface definition declared the
 150  * method_mask[] member as an array of __u32 but treated it as a
 151  * bitmap made up of longs in the kernel.  This ambiguity meant that
 152  * 32-bit big-endian applications that can run on both 32-bit and
 153  * 64-bit kernels had no consistent ABI to rely on, and 64-bit
 154  * big-endian applications that treated method_mask as being made up
 155  * of 32-bit words would have their bitmap misinterpreted.
 156  *
 157  * To clear up this confusion, we change the declaration of
 158  * method_mask[] to use unsigned long and handle the conversion from
 159  * 32-bit userspace to 64-bit kernel for big-endian systems in the
 160  * compat_ioctl method.  Unfortunately, to keep the structure layout
 161  * the same, we need the method_mask[] array to be aligned only to 4
 162  * bytes even when long is 64 bits, which forces us into this ugly
 163  * typedef.
 164  */
 165 typedef unsigned long __attribute__((aligned(4))) packed_ulong;
 166 #define IB_USER_MAD_LONGS_PER_METHOD_MASK (128 / (8 * sizeof (long)))
 167
 168 /**
 169  * ib_user_mad_reg_req - MAD registration request
 170  * @id - Set by the kernel; used to identify agent in future requests.
 171  * @qpn - Queue pair number; must be 0 or 1.
 172  * @method_mask - The caller will receive unsolicited MADs for any method
 173  *   where @method_mask = 1.
 174  * @mgmt_class - Indicates which management class of MADs should be receive
 175  *   by the caller.  This field is only required if the user wishes to
 176  *   receive unsolicited MADs, otherwise it should be 0.
 177  * @mgmt_class_version - Indicates which version of MADs for the given
 178  *   management class to receive.
 179  * @oui: Indicates IEEE OUI when mgmt_class is a vendor class
 180  *   in the range from 0x30 to 0x4f. Otherwise not used.
 181  * @rmpp_version: If set, indicates the RMPP version used.
 182  *
 183  */
 184 struct ib_user_mad_reg_req {
 185         __u32   id;
 186         packed_ulong method_mask[IB_USER_MAD_LONGS_PER_METHOD_MASK];
 187         __u8    qpn;
 188         __u8    mgmt_class;
 189         __u8    mgmt_class_version;
 190         __u8    oui[3];
 191         __u8    rmpp_version;
 192 };
 193
 194 #define IB_IOCTL_MAGIC          0x1b
 195
 196 #define IB_USER_MAD_REGISTER_AGENT      _IOWR(IB_IOCTL_MAGIC, 1, \
 197                                               struct ib_user_mad_reg_req)
 198
 199 #define IB_USER_MAD_UNREGISTER_AGENT    _IOW(IB_IOCTL_MAGIC, 2, __u32)
 200
 201 #define IB_USER_MAD_ENABLE_PKEY         _IO(IB_IOCTL_MAGIC, 3)
 202
 203 #endif /* IB_USER_MAD_H */