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 <linux/slab.h>
  34
  35 #include "mlx4_ib.h"
  36
  37 struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
  38 {
  39         struct mlx4_dev *dev = to_mdev(pd->device)->dev;
  40         struct mlx4_ib_ah *ah;
  41
  42         ah = kmalloc(sizeof *ah, GFP_ATOMIC);
  43         if (!ah)
  44                 return ERR_PTR(-ENOMEM);
  45
  46         memset(&ah->av, 0, sizeof ah->av);
  47
  48         ah->av.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
  49         ah->av.g_slid  = ah_attr->src_path_bits;
  50         ah->av.dlid    = cpu_to_be16(ah_attr->dlid);
  51         if (ah_attr->static_rate) {
  52                 ah->av.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
  53                 while (ah->av.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
  54                        !(1 << ah->av.stat_rate & dev->caps.stat_rate_support))
  55                         --ah->av.stat_rate;
  56         }
  57         ah->av.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
  58         if (ah_attr->ah_flags & IB_AH_GRH) {
  59                 ah->av.g_slid   |= 0x80;
  60                 ah->av.gid_index = ah_attr->grh.sgid_index;
  61                 ah->av.hop_limit = ah_attr->grh.hop_limit;
  62                 ah->av.sl_tclass_flowlabel |=
  63                         cpu_to_be32((ah_attr->grh.traffic_class << 20) |
  64                                     ah_attr->grh.flow_label);
  65                 memcpy(ah->av.dgid, ah_attr->grh.dgid.raw, 16);
  66         }
  67
  68         return &ah->ibah;
  69 }
  70
  71 int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
  72 {
  73         struct mlx4_ib_ah *ah = to_mah(ibah);
  74
  75         memset(ah_attr, 0, sizeof *ah_attr);
  76         ah_attr->dlid          = be16_to_cpu(ah->av.dlid);
  77         ah_attr->sl            = be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 28;
  78         ah_attr->port_num      = be32_to_cpu(ah->av.port_pd) >> 24;
  79         if (ah->av.stat_rate)
  80                 ah_attr->static_rate = ah->av.stat_rate - MLX4_STAT_RATE_OFFSET;
  81         ah_attr->src_path_bits = ah->av.g_slid & 0x7F;
  82
  83         if (mlx4_ib_ah_grh_present(ah)) {
  84                 ah_attr->ah_flags = IB_AH_GRH;
  85
  86                 ah_attr->grh.traffic_class =
  87                         be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 20;
  88                 ah_attr->grh.flow_label =
  89                         be32_to_cpu(ah->av.sl_tclass_flowlabel) & 0xfffff;
  90                 ah_attr->grh.hop_limit  = ah->av.hop_limit;
  91                 ah_attr->grh.sgid_index = ah->av.gid_index;
  92                 memcpy(ah_attr->grh.dgid.raw, ah->av.dgid, 16);
  93         }
  94
  95         return 0;
  96 }
  97
  98 int mlx4_ib_destroy_ah(struct ib_ah *ah)
  99 {
 100         kfree(to_mah(ah));
 101         return 0;
 102 }