drivers/infiniband/hw/mlx5/ah.c

   1 /*
   2  * Copyright (c) 2013, Mellanox Technologies inc.  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
  35 struct 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
  54 struct 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
  65 int 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
  88 int mlx5_ib_destroy_ah(struct ib_ah *ah)
  89 {
  90         kfree(to_mah(ah));
  91         return 0;
  92 }