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
  35 static struct ib_ah *create_ib_ah(struct mlx5_ib_dev *dev,
  36                                   struct mlx5_ib_ah *ah,
  37                                   struct ib_ah_attr *ah_attr,
  38                                   enum rdma_link_layer ll)
  39 {
  40         if (ah_attr->ah_flags & IB_AH_GRH) {
  41                 memcpy(ah->av.rgid, &ah_attr->grh.dgid, 16);
  42                 ah->av.grh_gid_fl = cpu_to_be32(ah_attr->grh.flow_label |
  43                                                 (1 << 30) |
  44                                                 ah_attr->grh.sgid_index << 20);
  45                 ah->av.hop_limit = ah_attr->grh.hop_limit;
  46                 ah->av.tclass = ah_attr->grh.traffic_class;
  47         }
  48
  49         ah->av.stat_rate_sl = (ah_attr->static_rate << 4);
  50
  51         if (ll == IB_LINK_LAYER_ETHERNET) {
  52                 memcpy(ah->av.rmac, ah_attr->dmac, sizeof(ah_attr->dmac));
  53                 ah->av.udp_sport =
  54                         mlx5_get_roce_udp_sport(dev,
  55                                                 ah_attr->port_num,
  56                                                 ah_attr->grh.sgid_index);
  57                 ah->av.stat_rate_sl |= (ah_attr->sl & 0x7) << 1;
  58         } else {
  59                 ah->av.rlid = cpu_to_be16(ah_attr->dlid);
  60                 ah->av.fl_mlid = ah_attr->src_path_bits & 0x7f;
  61                 ah->av.stat_rate_sl |= (ah_attr->sl & 0xf);
  62         }
  63
  64         return &ah->ibah;
  65 }
  66
  67 struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
  68 {
  69         struct mlx5_ib_ah *ah;
  70         struct mlx5_ib_dev *dev = to_mdev(pd->device);
  71         enum rdma_link_layer ll;
  72
  73         ll = pd->device->get_link_layer(pd->device, ah_attr->port_num);
  74
  75         if (ll == IB_LINK_LAYER_ETHERNET && !(ah_attr->ah_flags & IB_AH_GRH))
  76                 return ERR_PTR(-EINVAL);
  77
  78         ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
  79         if (!ah)
  80                 return ERR_PTR(-ENOMEM);
  81
  82         return create_ib_ah(dev, ah, ah_attr, ll); /* never fails */
  83 }
  84
  85 int mlx5_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
  86 {
  87         struct mlx5_ib_ah *ah = to_mah(ibah);
  88         u32 tmp;
  89
  90         memset(ah_attr, 0, sizeof(*ah_attr));
  91
  92         tmp = be32_to_cpu(ah->av.grh_gid_fl);
  93         if (tmp & (1 << 30)) {
  94                 ah_attr->ah_flags = IB_AH_GRH;
  95                 ah_attr->grh.sgid_index = (tmp >> 20) & 0xff;
  96                 ah_attr->grh.flow_label = tmp & 0xfffff;
  97                 memcpy(&ah_attr->grh.dgid, ah->av.rgid, 16);
  98                 ah_attr->grh.hop_limit = ah->av.hop_limit;
  99                 ah_attr->grh.traffic_class = ah->av.tclass;
 100         }
 101         ah_attr->dlid = be16_to_cpu(ah->av.rlid);
 102         ah_attr->static_rate = ah->av.stat_rate_sl >> 4;
 103         ah_attr->sl = ah->av.stat_rate_sl & 0xf;
 104
 105         return 0;
 106 }
 107
 108 int mlx5_ib_destroy_ah(struct ib_ah *ah)
 109 {
 110         kfree(to_mah(ah));
 111         return 0;
 112 }