LXR linux/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
  35static 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
  71int 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
 104int 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
 128void mlx5_ib_destroy_ah(struct ib_ah *ah, u32 flags)
 129{
 130        return;
 131}
 132