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