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 void create_ib_ah(struct mlx5_ib_dev *dev, struct mlx5_ib_ah *ah,
  36                          struct rdma_ah_attr *ah_attr)
  37 {
  38         enum ib_gid_type gid_type;
  39
  40         if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
  41                 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
  42
  43                 memcpy(ah->av.rgid, &grh->dgid, 16);
  44                 ah->av.grh_gid_fl = cpu_to_be32(grh->flow_label |
  45                                                 (1 << 30) |
  46                                                 grh->sgid_index << 20);
  47                 ah->av.hop_limit = grh->hop_limit;
  48                 ah->av.tclass = grh->traffic_class;
  49         }
  50
  51         ah->av.stat_rate_sl = (rdma_ah_get_static_rate(ah_attr) << 4);
  52
  53         if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
  54                 gid_type = ah_attr->grh.sgid_attr->gid_type;
  55
  56                 memcpy(ah->av.rmac, ah_attr->roce.dmac,
  57                        sizeof(ah_attr->roce.dmac));
  58                 ah->av.udp_sport =
  59                         mlx5_get_roce_udp_sport(dev, ah_attr->grh.sgid_attr);
  60                 ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0x7) << 1;
  61                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
  62 #define MLX5_ECN_ENABLED BIT(1)
  63                         ah->av.tclass |= MLX5_ECN_ENABLED;
  64         } else {
  65                 ah->av.rlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
  66                 ah->av.fl_mlid = rdma_ah_get_path_bits(ah_attr) & 0x7f;
  67                 ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0xf);
  68         }
  69 }
  70
  71 int mlx5_ib_create_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr,
  72                       u32 flags, struct ib_udata *udata)
  73
  74 {
  75         struct mlx5_ib_ah *ah = to_mah(ibah);
  76         struct mlx5_ib_dev *dev = to_mdev(ibah->device);
  77         enum rdma_ah_attr_type ah_type = ah_attr->type;
  78
  79         if ((ah_type == RDMA_AH_ATTR_TYPE_ROCE) &&
  80             !(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
  81                 return -EINVAL;
  82
  83         if (ah_type == RDMA_AH_ATTR_TYPE_ROCE && udata) {
  84                 int err;
  85                 struct mlx5_ib_create_ah_resp resp = {};
  86                 u32 min_resp_len = offsetof(typeof(resp), dmac) +
  87                                    sizeof(resp.dmac);
  88
  89                 if (udata->outlen < min_resp_len)
  90                         return -EINVAL;
  91
  92                 resp.response_length = min_resp_len;
  93
  94                 memcpy(resp.dmac, ah_attr->roce.dmac, ETH_ALEN);
  95                 err = ib_copy_to_udata(udata, &resp, resp.response_length);
  96                 if (err)
  97                         return err;
  98         }
  99
 100         create_ib_ah(dev, ah, ah_attr);
 101         return 0;
 102 }
 103
 104 int mlx5_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
 105 {
 106         struct mlx5_ib_ah *ah = to_mah(ibah);
 107         u32 tmp;
 108
 109         memset(ah_attr, 0, sizeof(*ah_attr));
 110         ah_attr->type = ibah->type;
 111
 112         tmp = be32_to_cpu(ah->av.grh_gid_fl);
 113         if (tmp & (1 << 30)) {
 114                 rdma_ah_set_grh(ah_attr, NULL,
 115                                 tmp & 0xfffff,
 116                                 (tmp >> 20) & 0xff,
 117                                 ah->av.hop_limit,
 118                                 ah->av.tclass);
 119                 rdma_ah_set_dgid_raw(ah_attr, ah->av.rgid);
 120         }
 121         rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.rlid));
 122         rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate_sl >> 4);
 123         rdma_ah_set_sl(ah_attr, ah->av.stat_rate_sl & 0xf);
 124
 125         return 0;
 126 }
 127
 128 void mlx5_ib_destroy_ah(struct ib_ah *ah, u32 flags)
 129 {
 130         return;
 131 }