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 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
  67struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
  68                                struct ib_udata *udata)
  69
  70{
  71        struct mlx5_ib_ah *ah;
  72        struct mlx5_ib_dev *dev = to_mdev(pd->device);
  73        enum rdma_link_layer ll;
  74
  75        ll = pd->device->get_link_layer(pd->device, ah_attr->port_num);
  76
  77        if (ll == IB_LINK_LAYER_ETHERNET && !(ah_attr->ah_flags & IB_AH_GRH))
  78                return ERR_PTR(-EINVAL);
  79
  80        if (ll == IB_LINK_LAYER_ETHERNET && udata) {
  81                int err;
  82                struct mlx5_ib_create_ah_resp resp = {};
  83                u32 min_resp_len = offsetof(typeof(resp), dmac) +
  84                                   sizeof(resp.dmac);
  85
  86                if (udata->outlen < min_resp_len)
  87                        return ERR_PTR(-EINVAL);
  88
  89                resp.response_length = min_resp_len;
  90
  91                err = ib_resolve_eth_dmac(pd->device, ah_attr);
  92                if (err)
  93                        return ERR_PTR(err);
  94
  95                memcpy(resp.dmac, ah_attr->dmac, ETH_ALEN);
  96                err = ib_copy_to_udata(udata, &resp, resp.response_length);
  97                if (err)
  98                        return ERR_PTR(err);
  99        }
 100
 101        ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
 102        if (!ah)
 103                return ERR_PTR(-ENOMEM);
 104
 105        return create_ib_ah(dev, ah, ah_attr, ll); /* never fails */
 106}
 107
 108int mlx5_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
 109{
 110        struct mlx5_ib_ah *ah = to_mah(ibah);
 111        u32 tmp;
 112
 113        memset(ah_attr, 0, sizeof(*ah_attr));
 114
 115        tmp = be32_to_cpu(ah->av.grh_gid_fl);
 116        if (tmp & (1 << 30)) {
 117                ah_attr->ah_flags = IB_AH_GRH;
 118                ah_attr->grh.sgid_index = (tmp >> 20) & 0xff;
 119                ah_attr->grh.flow_label = tmp & 0xfffff;
 120                memcpy(&ah_attr->grh.dgid, ah->av.rgid, 16);
 121                ah_attr->grh.hop_limit = ah->av.hop_limit;
 122                ah_attr->grh.traffic_class = ah->av.tclass;
 123        }
 124        ah_attr->dlid = be16_to_cpu(ah->av.rlid);
 125        ah_attr->static_rate = ah->av.stat_rate_sl >> 4;
 126        ah_attr->sl = ah->av.stat_rate_sl & 0xf;
 127
 128        return 0;
 129}
 130
 131int mlx5_ib_destroy_ah(struct ib_ah *ah)
 132{
 133        kfree(to_mah(ah));
 134        return 0;
 135}
 136