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 rdma_ah_attr *ah_attr)
  38 {
  39         if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
  40                 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
  41
  42                 memcpy(ah->av.rgid, &grh->dgid, 16);
  43                 ah->av.grh_gid_fl = cpu_to_be32(grh->flow_label |
  44                                                 (1 << 30) |
  45                                                 grh->sgid_index << 20);
  46                 ah->av.hop_limit = grh->hop_limit;
  47                 ah->av.tclass = grh->traffic_class;
  48         }
  49
  50         ah->av.stat_rate_sl = (rdma_ah_get_static_rate(ah_attr) << 4);
  51
  52         if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
  53                 memcpy(ah->av.rmac, ah_attr->roce.dmac,
  54                        sizeof(ah_attr->roce.dmac));
  55                 ah->av.udp_sport =
  56                 mlx5_get_roce_udp_sport(dev,
  57                                         rdma_ah_get_port_num(ah_attr),
  58                                         rdma_ah_read_grh(ah_attr)->sgid_index);
  59                 ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0x7) << 1;
  60         } else {
  61                 ah->av.rlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
  62                 ah->av.fl_mlid = rdma_ah_get_path_bits(ah_attr) & 0x7f;
  63                 ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0xf);
  64         }
  65
  66         return &ah->ibah;
  67 }
  68
  69 struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr,
  70                                 struct ib_udata *udata)
  71
  72 {
  73         struct mlx5_ib_ah *ah;
  74         struct mlx5_ib_dev *dev = to_mdev(pd->device);
  75         enum rdma_ah_attr_type ah_type = ah_attr->type;
  76
  77         if ((ah_type == RDMA_AH_ATTR_TYPE_ROCE) &&
  78             !(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
  79                 return ERR_PTR(-EINVAL);
  80
  81         if (ah_type == RDMA_AH_ATTR_TYPE_ROCE && udata) {
  82                 int err;
  83                 struct mlx5_ib_create_ah_resp resp = {};
  84                 u32 min_resp_len = offsetof(typeof(resp), dmac) +
  85                                    sizeof(resp.dmac);
  86
  87                 if (udata->outlen < min_resp_len)
  88                         return ERR_PTR(-EINVAL);
  89
  90                 resp.response_length = min_resp_len;
  91
  92                 memcpy(resp.dmac, ah_attr->roce.dmac, ETH_ALEN);
  93                 err = ib_copy_to_udata(udata, &resp, resp.response_length);
  94                 if (err)
  95                         return ERR_PTR(err);
  96         }
  97
  98         ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
  99         if (!ah)
 100                 return ERR_PTR(-ENOMEM);
 101
 102         return create_ib_ah(dev, ah, ah_attr); /* never fails */
 103 }
 104
 105 int mlx5_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
 106 {
 107         struct mlx5_ib_ah *ah = to_mah(ibah);
 108         u32 tmp;
 109
 110         memset(ah_attr, 0, sizeof(*ah_attr));
 111         ah_attr->type = ibah->type;
 112
 113         tmp = be32_to_cpu(ah->av.grh_gid_fl);
 114         if (tmp & (1 << 30)) {
 115                 rdma_ah_set_grh(ah_attr, NULL,
 116                                 tmp & 0xfffff,
 117                                 (tmp >> 20) & 0xff,
 118                                 ah->av.hop_limit,
 119                                 ah->av.tclass);
 120                 rdma_ah_set_dgid_raw(ah_attr, ah->av.rgid);
 121         }
 122         rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.rlid));
 123         rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate_sl >> 4);
 124         rdma_ah_set_sl(ah_attr, ah->av.stat_rate_sl & 0xf);
 125
 126         return 0;
 127 }
 128
 129 int mlx5_ib_destroy_ah(struct ib_ah *ah)
 130 {
 131         kfree(to_mah(ah));
 132         return 0;
 133 }