drivers/infiniband/sw/rdmavt/ah.c

   1 /*
   2  * Copyright(c) 2016 - 2019 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  * @ibah: the IB address handle
  93  * @ah_attr: the attributes of the AH
  94  * @create_flags: create address handle flags (see enum rdma_create_ah_flags)
  95  * @udata: pointer to user's input output buffer information.
  96  *
  97  * This may be called from interrupt context.
  98  *
  99  * Return: 0 on success
 100  */
 101 int rvt_create_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr,
 102                   u32 create_flags, struct ib_udata *udata)
 103 {
 104         struct rvt_ah *ah = ibah_to_rvtah(ibah);
 105         struct rvt_dev_info *dev = ib_to_rvt(ibah->device);
 106         unsigned long flags;
 107
 108         if (rvt_check_ah(ibah->device, ah_attr))
 109                 return -EINVAL;
 110
 111         spin_lock_irqsave(&dev->n_ahs_lock, flags);
 112         if (dev->n_ahs_allocated == dev->dparms.props.max_ah) {
 113                 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
 114                 return -ENOMEM;
 115         }
 116
 117         dev->n_ahs_allocated++;
 118         spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
 119
 120         rdma_copy_ah_attr(&ah->attr, ah_attr);
 121
 122         if (dev->driver_f.notify_new_ah)
 123                 dev->driver_f.notify_new_ah(ibah->device, ah_attr, ah);
 124
 125         return 0;
 126 }
 127
 128 /**
 129  * rvt_destory_ah - Destory an address handle
 130  * @ibah: address handle
 131  * @destroy_flags: destroy address handle flags (see enum rdma_destroy_ah_flags)
 132  *
 133  * Return: 0 on success
 134  */
 135 void rvt_destroy_ah(struct ib_ah *ibah, u32 destroy_flags)
 136 {
 137         struct rvt_dev_info *dev = ib_to_rvt(ibah->device);
 138         struct rvt_ah *ah = ibah_to_rvtah(ibah);
 139         unsigned long flags;
 140
 141         spin_lock_irqsave(&dev->n_ahs_lock, flags);
 142         dev->n_ahs_allocated--;
 143         spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
 144
 145         rdma_destroy_ah_attr(&ah->attr);
 146 }
 147
 148 /**
 149  * rvt_modify_ah - modify an ah with given attrs
 150  * @ibah: address handle to modify
 151  * @ah_attr: attrs to apply
 152  *
 153  * Return: 0 on success
 154  */
 155 int rvt_modify_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
 156 {
 157         struct rvt_ah *ah = ibah_to_rvtah(ibah);
 158
 159         if (rvt_check_ah(ibah->device, ah_attr))
 160                 return -EINVAL;
 161
 162         ah->attr = *ah_attr;
 163
 164         return 0;
 165 }
 166
 167 /**
 168  * rvt_query_ah - return attrs for ah
 169  * @ibah: address handle to query
 170  * @ah_attr: return info in this
 171  *
 172  * Return: always 0
 173  */
 174 int rvt_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
 175 {
 176         struct rvt_ah *ah = ibah_to_rvtah(ibah);
 177
 178         *ah_attr = ah->attr;
 179
 180         return 0;
 181 }