drivers/infiniband/sw/rdmavt/ah.c

   1 /*
   2  * Copyright(c) 2016 Intel Corporation.
   3  *
   4  * This file is provided under a dual BSD/GPLv2 license.  When using or
   5  * redistributing this file, you may do so under either license.
   6  *
   7  * GPL LICENSE SUMMARY
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * BSD LICENSE
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  *
  24  *  - Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  *  - Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in
  28  *    the documentation and/or other materials provided with the
  29  *    distribution.
  30  *  - Neither the name of Intel Corporation nor the names of its
  31  *    contributors may be used to endorse or promote products derived
  32  *    from this software without specific prior written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45  *
  46  */
  47
  48 #include <linux/slab.h>
  49 #include "ah.h"
  50 #include "vt.h" /* for prints */
  51
  52 /**
  53  * rvt_check_ah - validate the attributes of AH
  54  * @ibdev: the ib device
  55  * @ah_attr: the attributes of the AH
  56  *
  57  * If driver supports a more detailed check_ah function call back to it
  58  * otherwise just check the basics.
  59  *
  60  * Return: 0 on success
  61  */
  62 int rvt_check_ah(struct ib_device *ibdev,
  63                  struct rdma_ah_attr *ah_attr)
  64 {
  65         int err;
  66         int port_num = rdma_ah_get_port_num(ah_attr);
  67         struct ib_port_attr port_attr;
  68         struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
  69         u8 ah_flags = rdma_ah_get_ah_flags(ah_attr);
  70         u8 static_rate = rdma_ah_get_static_rate(ah_attr);
  71
  72         err = ib_query_port(ibdev, port_num, &port_attr);
  73         if (err)
  74                 return -EINVAL;
  75         if (port_num < 1 ||
  76             port_num > ibdev->phys_port_cnt)
  77                 return -EINVAL;
  78         if (static_rate != IB_RATE_PORT_CURRENT &&
  79             ib_rate_to_mbps(static_rate) < 0)
  80                 return -EINVAL;
  81         if ((ah_flags & IB_AH_GRH) &&
  82             rdma_ah_read_grh(ah_attr)->sgid_index >= port_attr.gid_tbl_len)
  83                 return -EINVAL;
  84         if (rdi->driver_f.check_ah)
  85                 return rdi->driver_f.check_ah(ibdev, ah_attr);
  86         return 0;
  87 }
  88 EXPORT_SYMBOL(rvt_check_ah);
  89
  90 /**
  91  * rvt_create_ah - create an address handle
  92  * @pd: the protection domain
  93  * @ah_attr: the attributes of the AH
  94  *
  95  * This may be called from interrupt context.
  96  *
  97  * Return: newly allocated ah
  98  */
  99 struct ib_ah *rvt_create_ah(struct ib_pd *pd,
 100                             struct rdma_ah_attr *ah_attr)
 101 {
 102         struct rvt_ah *ah;
 103         struct rvt_dev_info *dev = ib_to_rvt(pd->device);
 104         unsigned long flags;
 105
 106         if (rvt_check_ah(pd->device, ah_attr))
 107                 return ERR_PTR(-EINVAL);
 108
 109         ah = kmalloc(sizeof(*ah), GFP_ATOMIC);
 110         if (!ah)
 111                 return ERR_PTR(-ENOMEM);
 112
 113         spin_lock_irqsave(&dev->n_ahs_lock, flags);
 114         if (dev->n_ahs_allocated == dev->dparms.props.max_ah) {
 115                 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
 116                 kfree(ah);
 117                 return ERR_PTR(-ENOMEM);
 118         }
 119
 120         dev->n_ahs_allocated++;
 121         spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
 122
 123         ah->attr = *ah_attr;
 124         atomic_set(&ah->refcount, 0);
 125
 126         if (dev->driver_f.notify_new_ah)
 127                 dev->driver_f.notify_new_ah(pd->device, ah_attr, ah);
 128
 129         return &ah->ibah;
 130 }
 131
 132 /**
 133  * rvt_destory_ah - Destory an address handle
 134  * @ibah: address handle
 135  *
 136  * Return: 0 on success
 137  */
 138 int rvt_destroy_ah(struct ib_ah *ibah)
 139 {
 140         struct rvt_dev_info *dev = ib_to_rvt(ibah->device);
 141         struct rvt_ah *ah = ibah_to_rvtah(ibah);
 142         unsigned long flags;
 143
 144         if (atomic_read(&ah->refcount) != 0)
 145                 return -EBUSY;
 146
 147         spin_lock_irqsave(&dev->n_ahs_lock, flags);
 148         dev->n_ahs_allocated--;
 149         spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
 150
 151         kfree(ah);
 152
 153         return 0;
 154 }
 155
 156 /**
 157  * rvt_modify_ah - modify an ah with given attrs
 158  * @ibah: address handle to modify
 159  * @ah_attr: attrs to apply
 160  *
 161  * Return: 0 on success
 162  */
 163 int rvt_modify_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
 164 {
 165         struct rvt_ah *ah = ibah_to_rvtah(ibah);
 166
 167         if (rvt_check_ah(ibah->device, ah_attr))
 168                 return -EINVAL;
 169
 170         ah->attr = *ah_attr;
 171
 172         return 0;
 173 }
 174
 175 /**
 176  * rvt_query_ah - return attrs for ah
 177  * @ibah: address handle to query
 178  * @ah_attr: return info in this
 179  *
 180  * Return: always 0
 181  */
 182 int rvt_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
 183 {
 184         struct rvt_ah *ah = ibah_to_rvtah(ibah);
 185
 186         *ah_attr = ah->attr;
 187
 188         return 0;
 189 }