drivers/infiniband/hw/mlx4/ah.c

   1 /*
   2  * Copyright (c) 2007 Cisco Systems, Inc. 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 <rdma/ib_addr.h>
  34 #include <rdma/ib_cache.h>
  35
  36 #include <linux/slab.h>
  37 #include <linux/inet.h>
  38 #include <linux/string.h>
  39 #include <linux/mlx4/driver.h>
  40
  41 #include "mlx4_ib.h"
  42
  43 static struct ib_ah *create_ib_ah(struct ib_pd *pd,
  44                                   struct rdma_ah_attr *ah_attr,
  45                                   struct mlx4_ib_ah *ah)
  46 {
  47         struct mlx4_dev *dev = to_mdev(pd->device)->dev;
  48
  49         ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn |
  50                             (rdma_ah_get_port_num(ah_attr) << 24));
  51         ah->av.ib.g_slid  = rdma_ah_get_path_bits(ah_attr);
  52         ah->av.ib.sl_tclass_flowlabel =
  53                         cpu_to_be32(rdma_ah_get_sl(ah_attr) << 28);
  54         if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
  55                 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
  56
  57                 ah->av.ib.g_slid   |= 0x80;
  58                 ah->av.ib.gid_index = grh->sgid_index;
  59                 ah->av.ib.hop_limit = grh->hop_limit;
  60                 ah->av.ib.sl_tclass_flowlabel |=
  61                         cpu_to_be32((grh->traffic_class << 20) |
  62                                     grh->flow_label);
  63                 memcpy(ah->av.ib.dgid, grh->dgid.raw, 16);
  64         }
  65
  66         ah->av.ib.dlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
  67         if (rdma_ah_get_static_rate(ah_attr)) {
  68                 u8 static_rate = rdma_ah_get_static_rate(ah_attr) +
  69                                         MLX4_STAT_RATE_OFFSET;
  70
  71                 while (static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
  72                        !(1 << static_rate & dev->caps.stat_rate_support))
  73                         --static_rate;
  74                 ah->av.ib.stat_rate = static_rate;
  75         }
  76
  77         return &ah->ibah;
  78 }
  79
  80 static struct ib_ah *create_iboe_ah(struct ib_pd *pd,
  81                                     struct rdma_ah_attr *ah_attr,
  82                                     struct mlx4_ib_ah *ah)
  83 {
  84         struct mlx4_ib_dev *ibdev = to_mdev(pd->device);
  85         struct mlx4_dev *dev = ibdev->dev;
  86         int is_mcast = 0;
  87         struct in6_addr in6;
  88         u16 vlan_tag = 0xffff;
  89         union ib_gid sgid;
  90         struct ib_gid_attr gid_attr;
  91         const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
  92         int ret;
  93
  94         memcpy(&in6, grh->dgid.raw, sizeof(in6));
  95         if (rdma_is_multicast_addr(&in6))
  96                 is_mcast = 1;
  97
  98         memcpy(ah->av.eth.mac, ah_attr->roce.dmac, ETH_ALEN);
  99         ret = ib_get_cached_gid(pd->device, rdma_ah_get_port_num(ah_attr),
 100                                 grh->sgid_index, &sgid, &gid_attr);
 101         if (ret)
 102                 return ERR_PTR(ret);
 103         eth_zero_addr(ah->av.eth.s_mac);
 104         if (gid_attr.ndev) {
 105                 if (is_vlan_dev(gid_attr.ndev))
 106                         vlan_tag = vlan_dev_vlan_id(gid_attr.ndev);
 107                 memcpy(ah->av.eth.s_mac, gid_attr.ndev->dev_addr, ETH_ALEN);
 108                 dev_put(gid_attr.ndev);
 109         }
 110         if (vlan_tag < 0x1000)
 111                 vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13;
 112         ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn |
 113                                          (rdma_ah_get_port_num(ah_attr) << 24));
 114         ret = mlx4_ib_gid_index_to_real_index(ibdev,
 115                                               rdma_ah_get_port_num(ah_attr),
 116                                               grh->sgid_index);
 117         if (ret < 0)
 118                 return ERR_PTR(ret);
 119         ah->av.eth.gid_index = ret;
 120         ah->av.eth.vlan = cpu_to_be16(vlan_tag);
 121         ah->av.eth.hop_limit = grh->hop_limit;
 122         if (rdma_ah_get_static_rate(ah_attr)) {
 123                 ah->av.eth.stat_rate = rdma_ah_get_static_rate(ah_attr) +
 124                                         MLX4_STAT_RATE_OFFSET;
 125                 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
 126                        !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support))
 127                         --ah->av.eth.stat_rate;
 128         }
 129         ah->av.eth.sl_tclass_flowlabel |=
 130                         cpu_to_be32((grh->traffic_class << 20) |
 131                                     grh->flow_label);
 132         /*
 133          * HW requires multicast LID so we just choose one.
 134          */
 135         if (is_mcast)
 136                 ah->av.ib.dlid = cpu_to_be16(0xc000);
 137
 138         memcpy(ah->av.eth.dgid, grh->dgid.raw, 16);
 139         ah->av.eth.sl_tclass_flowlabel |= cpu_to_be32(rdma_ah_get_sl(ah_attr)
 140                                                       << 29);
 141         return &ah->ibah;
 142 }
 143
 144 struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr,
 145                                 struct ib_udata *udata)
 146
 147 {
 148         struct mlx4_ib_ah *ah;
 149         struct ib_ah *ret;
 150
 151         ah = kzalloc(sizeof *ah, GFP_ATOMIC);
 152         if (!ah)
 153                 return ERR_PTR(-ENOMEM);
 154
 155         if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
 156                 if (!(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH)) {
 157                         ret = ERR_PTR(-EINVAL);
 158                 } else {
 159                         /*
 160                          * TBD: need to handle the case when we get
 161                          * called in an atomic context and there we
 162                          * might sleep.  We don't expect this
 163                          * currently since we're working with link
 164                          * local addresses which we can translate
 165                          * without going to sleep.
 166                          */
 167                         ret = create_iboe_ah(pd, ah_attr, ah);
 168                 }
 169
 170                 if (IS_ERR(ret))
 171                         kfree(ah);
 172
 173                 return ret;
 174         } else
 175                 return create_ib_ah(pd, ah_attr, ah); /* never fails */
 176 }
 177
 178 int mlx4_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
 179 {
 180         struct mlx4_ib_ah *ah = to_mah(ibah);
 181         int port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
 182
 183         memset(ah_attr, 0, sizeof *ah_attr);
 184         ah_attr->type = ibah->type;
 185
 186         if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
 187                 rdma_ah_set_dlid(ah_attr, 0);
 188                 rdma_ah_set_sl(ah_attr,
 189                                be32_to_cpu(ah->av.eth.sl_tclass_flowlabel)
 190                                >> 29);
 191         } else {
 192                 rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.ib.dlid));
 193                 rdma_ah_set_sl(ah_attr,
 194                                be32_to_cpu(ah->av.ib.sl_tclass_flowlabel)
 195                                >> 28);
 196         }
 197
 198         rdma_ah_set_port_num(ah_attr, port_num);
 199         if (ah->av.ib.stat_rate)
 200                 rdma_ah_set_static_rate(ah_attr,
 201                                         ah->av.ib.stat_rate -
 202                                         MLX4_STAT_RATE_OFFSET);
 203         rdma_ah_set_path_bits(ah_attr, ah->av.ib.g_slid & 0x7F);
 204         if (mlx4_ib_ah_grh_present(ah)) {
 205                 u32 tc_fl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel);
 206
 207                 rdma_ah_set_grh(ah_attr, NULL,
 208                                 tc_fl & 0xfffff, ah->av.ib.gid_index,
 209                                 ah->av.ib.hop_limit,
 210                                 tc_fl >> 20);
 211                 rdma_ah_set_dgid_raw(ah_attr, ah->av.ib.dgid);
 212         }
 213
 214         return 0;
 215 }
 216
 217 int mlx4_ib_destroy_ah(struct ib_ah *ah)
 218 {
 219         kfree(to_mah(ah));
 220         return 0;
 221 }