LXR linux/drivers/infiniband/hw/mlx5/ah.c

   1/*
   2 * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
   3 *
   4 * This software is available to you under a choice of one of two
   5 * licenses.  You may choose to be licensed under the terms of the GNU
   6 * General Public License (GPL) Version 2, available from the file
   7 * COPYING in the main directory of this source tree, or the
   8 * OpenIB.org BSD license below:
   9 *
  10 *     Redistribution and use in source and binary forms, with or
  11 *     without modification, are permitted provided that the following
  12 *     conditions are met:
  13 *
  14 *      - Redistributions of source code must retain the above
  15 *        copyright notice, this list of conditions and the following
  16 *        disclaimer.
  17 *
  18 *      - Redistributions in binary form must reproduce the above
  19 *        copyright notice, this list of conditions and the following
  20 *        disclaimer in the documentation and/or other materials
  21 *        provided with the distribution.
  22 *
  23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30 * SOFTWARE.
  31 */
  32
  33#include "mlx5_ib.h"
  34
  35struct ib_ah *create_ib_ah(struct ib_ah_attr *ah_attr,
  36                           struct mlx5_ib_ah *ah)
  37{
  38        if (ah_attr->ah_flags & IB_AH_GRH) {
  39                memcpy(ah->av.rgid, &ah_attr->grh.dgid, 16);
  40                ah->av.grh_gid_fl = cpu_to_be32(ah_attr->grh.flow_label |
  41                                                (1 << 30) |
  42                                                ah_attr->grh.sgid_index << 20);
  43                ah->av.hop_limit = ah_attr->grh.hop_limit;
  44                ah->av.tclass = ah_attr->grh.traffic_class;
  45        }
  46
  47        ah->av.rlid = cpu_to_be16(ah_attr->dlid);
  48        ah->av.fl_mlid = ah_attr->src_path_bits & 0x7f;
  49        ah->av.stat_rate_sl = (ah_attr->static_rate << 4) | (ah_attr->sl & 0xf);
  50
  51        return &ah->ibah;
  52}
  53
  54struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
  55{
  56        struct mlx5_ib_ah *ah;
  57
  58        ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
  59        if (!ah)
  60                return ERR_PTR(-ENOMEM);
  61
  62        return create_ib_ah(ah_attr, ah); /* never fails */
  63}
  64
  65int mlx5_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
  66{
  67        struct mlx5_ib_ah *ah = to_mah(ibah);
  68        u32 tmp;
  69
  70        memset(ah_attr, 0, sizeof(*ah_attr));
  71
  72        tmp = be32_to_cpu(ah->av.grh_gid_fl);
  73        if (tmp & (1 << 30)) {
  74                ah_attr->ah_flags = IB_AH_GRH;
  75                ah_attr->grh.sgid_index = (tmp >> 20) & 0xff;
  76                ah_attr->grh.flow_label = tmp & 0xfffff;
  77                memcpy(&ah_attr->grh.dgid, ah->av.rgid, 16);
  78                ah_attr->grh.hop_limit = ah->av.hop_limit;
  79                ah_attr->grh.traffic_class = ah->av.tclass;
  80        }
  81        ah_attr->dlid = be16_to_cpu(ah->av.rlid);
  82        ah_attr->static_rate = ah->av.stat_rate_sl >> 4;
  83        ah_attr->sl = ah->av.stat_rate_sl & 0xf;
  84
  85        return 0;
  86}
  87
  88int mlx5_ib_destroy_ah(struct ib_ah *ah)
  89{
  90        kfree(to_mah(ah));
  91        return 0;
  92}
  93