LXR linux/include/rdma/opa

   1/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
   2/*
   3 * Copyright(c) 2017 Intel Corporation.
   4 */
   5
   6#ifndef OPA_ADDR_H
   7#define OPA_ADDR_H
   8
   9#include <rdma/opa_smi.h>
  10
  11#define OPA_SPECIAL_OUI         (0x00066AULL)
  12#define OPA_MAKE_ID(x)          (cpu_to_be64(OPA_SPECIAL_OUI << 40 | (x)))
  13#define OPA_TO_IB_UCAST_LID(x) (((x) >= be16_to_cpu(IB_MULTICAST_LID_BASE)) \
  14                                ? 0 : x)
  15#define OPA_GID_INDEX           0x1
  16/**
  17 * 0xF8 - 4 bits of multicast range and 1 bit for collective range
  18 * Example: For 24 bit LID space,
  19 * Multicast range: 0xF00000 to 0xF7FFFF
  20 * Collective range: 0xF80000 to 0xFFFFFE
  21 */
  22#define OPA_MCAST_NR 0x4 /* Number of top bits set */
  23#define OPA_COLLECTIVE_NR 0x1 /* Number of bits after MCAST_NR */
  24
  25/**
  26 * ib_is_opa_gid: Returns true if the top 24 bits of the gid
  27 * contains the OPA_STL_OUI identifier. This identifies that
  28 * the provided gid is a special purpose GID meant to carry
  29 * extended LID information.
  30 *
  31 * @gid: The Global identifier
  32 */
  33static inline bool ib_is_opa_gid(const union ib_gid *gid)
  34{
  35        return ((be64_to_cpu(gid->global.interface_id) >> 40) ==
  36                OPA_SPECIAL_OUI);
  37}
  38
  39/**
  40 * opa_get_lid_from_gid: Returns the last 32 bits of the gid.
  41 * OPA devices use one of the gids in the gid table to also
  42 * store the lid.
  43 *
  44 * @gid: The Global identifier
  45 */
  46static inline u32 opa_get_lid_from_gid(const union ib_gid *gid)
  47{
  48        return be64_to_cpu(gid->global.interface_id) & 0xFFFFFFFF;
  49}
  50
  51/**
  52 * opa_is_extended_lid: Returns true if dlid or slid are
  53 * extended.
  54 *
  55 * @dlid: The DLID
  56 * @slid: The SLID
  57 */
  58static inline bool opa_is_extended_lid(__be32 dlid, __be32 slid)
  59{
  60        if ((be32_to_cpu(dlid) >=
  61             be16_to_cpu(IB_MULTICAST_LID_BASE)) ||
  62            (be32_to_cpu(slid) >=
  63             be16_to_cpu(IB_MULTICAST_LID_BASE)))
  64                return true;
  65
  66        return false;
  67}
  68
  69/* Get multicast lid base */
  70static inline u32 opa_get_mcast_base(u32 nr_top_bits)
  71{
  72        return (be32_to_cpu(OPA_LID_PERMISSIVE) << (32 - nr_top_bits));
  73}
  74
  75/* Check for a valid unicast LID for non-SM traffic types */
  76static inline bool rdma_is_valid_unicast_lid(struct rdma_ah_attr *attr)
  77{
  78        if (attr->type == RDMA_AH_ATTR_TYPE_IB) {
  79                if (!rdma_ah_get_dlid(attr) ||
  80                    rdma_ah_get_dlid(attr) >=
  81                    be16_to_cpu(IB_MULTICAST_LID_BASE))
  82                        return false;
  83        } else if (attr->type == RDMA_AH_ATTR_TYPE_OPA) {
  84                if (!rdma_ah_get_dlid(attr) ||
  85                    rdma_ah_get_dlid(attr) >=
  86                    opa_get_mcast_base(OPA_MCAST_NR))
  87                        return false;
  88        }
  89        return true;
  90}
  91#endif /* OPA_ADDR_H */
  92