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
  40 #include "mlx4_ib.h"
  41
  42 int mlx4_ib_resolve_grh(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah_attr,
  43                         u8 *mac, int *is_mcast, u8 port)
  44 {
  45         struct in6_addr in6;
  46
  47         *is_mcast = 0;
  48
  49         memcpy(&in6, ah_attr->grh.dgid.raw, sizeof in6);
  50         if (rdma_link_local_addr(&in6))
  51                 rdma_get_ll_mac(&in6, mac);
  52         else if (rdma_is_multicast_addr(&in6)) {
  53                 rdma_get_mcast_mac(&in6, mac);
  54                 *is_mcast = 1;
  55         } else
  56                 return -EINVAL;
  57
  58         return 0;
  59 }
  60
  61 static struct ib_ah *create_ib_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
  62                                   struct mlx4_ib_ah *ah)
  63 {
  64         struct mlx4_dev *dev = to_mdev(pd->device)->dev;
  65
  66         ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
  67         ah->av.ib.g_slid  = ah_attr->src_path_bits;
  68         if (ah_attr->ah_flags & IB_AH_GRH) {
  69                 ah->av.ib.g_slid   |= 0x80;
  70                 ah->av.ib.gid_index = ah_attr->grh.sgid_index;
  71                 ah->av.ib.hop_limit = ah_attr->grh.hop_limit;
  72                 ah->av.ib.sl_tclass_flowlabel |=
  73                         cpu_to_be32((ah_attr->grh.traffic_class << 20) |
  74                                     ah_attr->grh.flow_label);
  75                 memcpy(ah->av.ib.dgid, ah_attr->grh.dgid.raw, 16);
  76         }
  77
  78         ah->av.ib.dlid    = cpu_to_be16(ah_attr->dlid);
  79         if (ah_attr->static_rate) {
  80                 ah->av.ib.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
  81                 while (ah->av.ib.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
  82                        !(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support))
  83                         --ah->av.ib.stat_rate;
  84         }
  85         ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
  86
  87         return &ah->ibah;
  88 }
  89
  90 static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
  91                                     struct mlx4_ib_ah *ah)
  92 {
  93         struct mlx4_ib_dev *ibdev = to_mdev(pd->device);
  94         struct mlx4_dev *dev = ibdev->dev;
  95         union ib_gid sgid;
  96         u8 mac[6];
  97         int err;
  98         int is_mcast;
  99         u16 vlan_tag;
 100
 101         err = mlx4_ib_resolve_grh(ibdev, ah_attr, mac, &is_mcast, ah_attr->port_num);
 102         if (err)
 103                 return ERR_PTR(err);
 104
 105         memcpy(ah->av.eth.mac, mac, 6);
 106         err = ib_get_cached_gid(pd->device, ah_attr->port_num, ah_attr->grh.sgid_index, &sgid);
 107         if (err)
 108                 return ERR_PTR(err);
 109         vlan_tag = rdma_get_vlan_id(&sgid);
 110         if (vlan_tag < 0x1000)
 111                 vlan_tag |= (ah_attr->sl & 7) << 13;
 112         ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
 113         ah->av.eth.gid_index = ah_attr->grh.sgid_index;
 114         ah->av.eth.vlan = cpu_to_be16(vlan_tag);
 115         if (ah_attr->static_rate) {
 116                 ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
 117                 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
 118                        !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support))
 119                         --ah->av.eth.stat_rate;
 120         }
 121
 122         /*
 123          * HW requires multicast LID so we just choose one.
 124          */
 125         if (is_mcast)
 126                 ah->av.ib.dlid = cpu_to_be16(0xc000);
 127
 128         memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16);
 129         ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 29);
 130
 131         return &ah->ibah;
 132 }
 133
 134 struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
 135 {
 136         struct mlx4_ib_ah *ah;
 137         struct ib_ah *ret;
 138
 139         ah = kzalloc(sizeof *ah, GFP_ATOMIC);
 140         if (!ah)
 141                 return ERR_PTR(-ENOMEM);
 142
 143         if (rdma_port_get_link_layer(pd->device, ah_attr->port_num) == IB_LINK_LAYER_ETHERNET) {
 144                 if (!(ah_attr->ah_flags & IB_AH_GRH)) {
 145                         ret = ERR_PTR(-EINVAL);
 146                 } else {
 147                         /*
 148                          * TBD: need to handle the case when we get
 149                          * called in an atomic context and there we
 150                          * might sleep.  We don't expect this
 151                          * currently since we're working with link
 152                          * local addresses which we can translate
 153                          * without going to sleep.
 154                          */
 155                         ret = create_iboe_ah(pd, ah_attr, ah);
 156                 }
 157
 158                 if (IS_ERR(ret))
 159                         kfree(ah);
 160
 161                 return ret;
 162         } else
 163                 return create_ib_ah(pd, ah_attr, ah); /* never fails */
 164 }
 165
 166 int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
 167 {
 168         struct mlx4_ib_ah *ah = to_mah(ibah);
 169         enum rdma_link_layer ll;
 170
 171         memset(ah_attr, 0, sizeof *ah_attr);
 172         ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
 173         ah_attr->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
 174         ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num);
 175         ah_attr->dlid = ll == IB_LINK_LAYER_INFINIBAND ? be16_to_cpu(ah->av.ib.dlid) : 0;
 176         if (ah->av.ib.stat_rate)
 177                 ah_attr->static_rate = ah->av.ib.stat_rate - MLX4_STAT_RATE_OFFSET;
 178         ah_attr->src_path_bits = ah->av.ib.g_slid & 0x7F;
 179
 180         if (mlx4_ib_ah_grh_present(ah)) {
 181                 ah_attr->ah_flags = IB_AH_GRH;
 182
 183                 ah_attr->grh.traffic_class =
 184                         be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20;
 185                 ah_attr->grh.flow_label =
 186                         be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) & 0xfffff;
 187                 ah_attr->grh.hop_limit  = ah->av.ib.hop_limit;
 188                 ah_attr->grh.sgid_index = ah->av.ib.gid_index;
 189                 memcpy(ah_attr->grh.dgid.raw, ah->av.ib.dgid, 16);
 190         }
 191
 192         return 0;
 193 }
 194
 195 int mlx4_ib_destroy_ah(struct ib_ah *ah)
 196 {
 197         kfree(to_mah(ah));
 198         return 0;
 199 }