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 __be16 mlx5_ah_get_udp_sport(const struct mlx5_ib_dev *dev,
  36                                   const struct rdma_ah_attr *ah_attr)
  37 {
  38         enum ib_gid_type gid_type = ah_attr->grh.sgid_attr->gid_type;
  39         __be16 sport;
  40
  41         if ((gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) &&
  42             (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) &&
  43             (ah_attr->grh.flow_label & IB_GRH_FLOWLABEL_MASK))
  44                 sport = cpu_to_be16(
  45                         rdma_flow_label_to_udp_sport(ah_attr->grh.flow_label));
  46         else
  47                 sport = mlx5_get_roce_udp_sport_min(dev,
  48                                                     ah_attr->grh.sgid_attr);
  49
  50         return sport;
  51 }
  52
  53 static void create_ib_ah(struct mlx5_ib_dev *dev, struct mlx5_ib_ah *ah,
  54                          struct rdma_ah_init_attr *init_attr)
  55 {
  56         struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
  57         enum ib_gid_type gid_type;
  58
  59         if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
  60                 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
  61
  62                 memcpy(ah->av.rgid, &grh->dgid, 16);
  63                 ah->av.grh_gid_fl = cpu_to_be32(grh->flow_label |
  64                                                 (1 << 30) |
  65                                                 grh->sgid_index << 20);
  66                 ah->av.hop_limit = grh->hop_limit;
  67                 ah->av.tclass = grh->traffic_class;
  68         }
  69
  70         ah->av.stat_rate_sl = (rdma_ah_get_static_rate(ah_attr) << 4);
  71
  72         if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
  73                 if (init_attr->xmit_slave)
  74                         ah->xmit_port =
  75                                 mlx5_lag_get_slave_port(dev->mdev,
  76                                                         init_attr->xmit_slave);
  77                 gid_type = ah_attr->grh.sgid_attr->gid_type;
  78
  79                 memcpy(ah->av.rmac, ah_attr->roce.dmac,
  80                        sizeof(ah_attr->roce.dmac));
  81                 ah->av.udp_sport = mlx5_ah_get_udp_sport(dev, ah_attr);
  82                 ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0x7) << 1;
  83                 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
  84 #define MLX5_ECN_ENABLED BIT(1)
  85                         ah->av.tclass |= MLX5_ECN_ENABLED;
  86         } else {
  87                 ah->av.rlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
  88                 ah->av.fl_mlid = rdma_ah_get_path_bits(ah_attr) & 0x7f;
  89                 ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0xf);
  90         }
  91 }
  92
  93 int mlx5_ib_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
  94                       struct ib_udata *udata)
  95
  96 {
  97         struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
  98         struct mlx5_ib_ah *ah = to_mah(ibah);
  99         struct mlx5_ib_dev *dev = to_mdev(ibah->device);
 100         enum rdma_ah_attr_type ah_type = ah_attr->type;
 101
 102         if ((ah_type == RDMA_AH_ATTR_TYPE_ROCE) &&
 103             !(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
 104                 return -EINVAL;
 105
 106         if (ah_type == RDMA_AH_ATTR_TYPE_ROCE && udata) {
 107                 int err;
 108                 struct mlx5_ib_create_ah_resp resp = {};
 109                 u32 min_resp_len =
 110                         offsetofend(struct mlx5_ib_create_ah_resp, dmac);
 111
 112                 if (udata->outlen < min_resp_len)
 113                         return -EINVAL;
 114
 115                 resp.response_length = min_resp_len;
 116
 117                 memcpy(resp.dmac, ah_attr->roce.dmac, ETH_ALEN);
 118                 err = ib_copy_to_udata(udata, &resp, resp.response_length);
 119                 if (err)
 120                         return err;
 121         }
 122
 123         create_ib_ah(dev, ah, init_attr);
 124         return 0;
 125 }
 126
 127 int mlx5_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
 128 {
 129         struct mlx5_ib_ah *ah = to_mah(ibah);
 130         u32 tmp;
 131
 132         memset(ah_attr, 0, sizeof(*ah_attr));
 133         ah_attr->type = ibah->type;
 134
 135         tmp = be32_to_cpu(ah->av.grh_gid_fl);
 136         if (tmp & (1 << 30)) {
 137                 rdma_ah_set_grh(ah_attr, NULL,
 138                                 tmp & 0xfffff,
 139                                 (tmp >> 20) & 0xff,
 140                                 ah->av.hop_limit,
 141                                 ah->av.tclass);
 142                 rdma_ah_set_dgid_raw(ah_attr, ah->av.rgid);
 143         }
 144         rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.rlid));
 145         rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate_sl >> 4);
 146         rdma_ah_set_sl(ah_attr, ah->av.stat_rate_sl & 0xf);
 147
 148         return 0;
 149 }