LXR linux/include/rdma/opa

   1/*
   2 * Copyright(c) 2017 Intel Corporation.
   3 *
   4 * This file is provided under a dual BSD/GPLv2 license.  When using or
   5 * redistributing this file, you may do so under either license.
   6 *
   7 * GPL LICENSE SUMMARY
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of version 2 of the GNU General Public License as
  11 * published by the Free Software Foundation.
  12 *
  13 * This program is distributed in the hope that it will be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 * General Public License for more details.
  17 *
  18 * BSD LICENSE
  19 *
  20 * Redistribution and use in source and binary forms, with or without
  21 * modification, are permitted provided that the following conditions
  22 * are met:
  23 *
  24 *  - Redistributions of source code must retain the above copyright
  25 *    notice, this list of conditions and the following disclaimer.
  26 *  - Redistributions in binary form must reproduce the above copyright
  27 *    notice, this list of conditions and the following disclaimer in
  28 *    the documentation and/or other materials provided with the
  29 *    distribution.
  30 *  - Neither the name of Intel Corporation nor the names of its
  31 *    contributors may be used to endorse or promote products derived
  32 *    from this software without specific prior written permission.
  33 *
  34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45 *
  46 */
  47
  48#ifndef OPA_ADDR_H
  49#define OPA_ADDR_H
  50
  51#include <rdma/opa_smi.h>
  52
  53#define OPA_SPECIAL_OUI         (0x00066AULL)
  54#define OPA_MAKE_ID(x)          (cpu_to_be64(OPA_SPECIAL_OUI << 40 | (x)))
  55#define OPA_TO_IB_UCAST_LID(x) (((x) >= be16_to_cpu(IB_MULTICAST_LID_BASE)) \
  56                                ? 0 : x)
  57#define OPA_GID_INDEX           0x1
  58/**
  59 * 0xF8 - 4 bits of multicast range and 1 bit for collective range
  60 * Example: For 24 bit LID space,
  61 * Multicast range: 0xF00000 to 0xF7FFFF
  62 * Collective range: 0xF80000 to 0xFFFFFE
  63 */
  64#define OPA_MCAST_NR 0x4 /* Number of top bits set */
  65#define OPA_COLLECTIVE_NR 0x1 /* Number of bits after MCAST_NR */
  66
  67/**
  68 * ib_is_opa_gid: Returns true if the top 24 bits of the gid
  69 * contains the OPA_STL_OUI identifier. This identifies that
  70 * the provided gid is a special purpose GID meant to carry
  71 * extended LID information.
  72 *
  73 * @gid: The Global identifier
  74 */
  75static inline bool ib_is_opa_gid(const union ib_gid *gid)
  76{
  77        return ((be64_to_cpu(gid->global.interface_id) >> 40) ==
  78                OPA_SPECIAL_OUI);
  79}
  80
  81/**
  82 * opa_get_lid_from_gid: Returns the last 32 bits of the gid.
  83 * OPA devices use one of the gids in the gid table to also
  84 * store the lid.
  85 *
  86 * @gid: The Global identifier
  87 */
  88static inline u32 opa_get_lid_from_gid(const union ib_gid *gid)
  89{
  90        return be64_to_cpu(gid->global.interface_id) & 0xFFFFFFFF;
  91}
  92
  93/**
  94 * opa_is_extended_lid: Returns true if dlid or slid are
  95 * extended.
  96 *
  97 * @dlid: The DLID
  98 * @slid: The SLID
  99 */
 100static inline bool opa_is_extended_lid(__be32 dlid, __be32 slid)
 101{
 102        if ((be32_to_cpu(dlid) >=
 103             be16_to_cpu(IB_MULTICAST_LID_BASE)) ||
 104            (be32_to_cpu(slid) >=
 105             be16_to_cpu(IB_MULTICAST_LID_BASE)))
 106                return true;
 107
 108        return false;
 109}
 110
 111/* Get multicast lid base */
 112static inline u32 opa_get_mcast_base(u32 nr_top_bits)
 113{
 114        return (be32_to_cpu(OPA_LID_PERMISSIVE) << (32 - nr_top_bits));
 115}
 116
 117/* Check for a valid unicast LID for non-SM traffic types */
 118static inline bool rdma_is_valid_unicast_lid(struct rdma_ah_attr *attr)
 119{
 120        if (attr->type == RDMA_AH_ATTR_TYPE_IB) {
 121                if (!rdma_ah_get_dlid(attr) ||
 122                    rdma_ah_get_dlid(attr) >=
 123                    be16_to_cpu(IB_MULTICAST_LID_BASE))
 124                        return false;
 125        } else if (attr->type == RDMA_AH_ATTR_TYPE_OPA) {
 126                if (!rdma_ah_get_dlid(attr) ||
 127                    rdma_ah_get_dlid(attr) >=
 128                    opa_get_mcast_base(OPA_MCAST_NR))
 129                        return false;
 130        }
 131        return true;
 132}
 133#endif /* OPA_ADDR_H */
 134