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 ib_ah_attr *ah_attr)
  64 {
  65         int err;
  66         struct ib_port_attr port_attr;
  67         struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
  68         enum rdma_link_layer link = rdma_port_get_link_layer(ibdev,
  69                                                              ah_attr->port_num);
  70
  71         err = ib_query_port(ibdev, ah_attr->port_num, &port_attr);
  72         if (err)
  73                 return -EINVAL;
  74         if (ah_attr->port_num < 1 ||
  75             ah_attr->port_num > ibdev->phys_port_cnt)
  76                 return -EINVAL;
  77         if (ah_attr->static_rate != IB_RATE_PORT_CURRENT &&
  78             ib_rate_to_mbps(ah_attr->static_rate) < 0)
  79                 return -EINVAL;
  80         if ((ah_attr->ah_flags & IB_AH_GRH) &&
  81             ah_attr->grh.sgid_index >= port_attr.gid_tbl_len)
  82                 return -EINVAL;
  83         if (link != IB_LINK_LAYER_ETHERNET) {
  84                 if (ah_attr->dlid == 0)
  85                         return -EINVAL;
  86                 if (ah_attr->dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE) &&
  87                     ah_attr->dlid != be16_to_cpu(IB_LID_PERMISSIVE) &&
  88                     !(ah_attr->ah_flags & IB_AH_GRH))
  89                         return -EINVAL;
  90         }
  91         if (rdi->driver_f.check_ah)
  92                 return rdi->driver_f.check_ah(ibdev, ah_attr);
  93         return 0;
  94 }
  95 EXPORT_SYMBOL(rvt_check_ah);
  96
  97 /**
  98  * rvt_create_ah - create an address handle
  99  * @pd: the protection domain
 100  * @ah_attr: the attributes of the AH
 101  *
 102  * This may be called from interrupt context.
 103  *
 104  * Return: newly allocated ah
 105  */
 106 struct ib_ah *rvt_create_ah(struct ib_pd *pd,
 107                             struct ib_ah_attr *ah_attr)
 108 {
 109         struct rvt_ah *ah;
 110         struct rvt_dev_info *dev = ib_to_rvt(pd->device);
 111         unsigned long flags;
 112
 113         if (rvt_check_ah(pd->device, ah_attr))
 114                 return ERR_PTR(-EINVAL);
 115
 116         ah = kmalloc(sizeof(*ah), GFP_ATOMIC);
 117         if (!ah)
 118                 return ERR_PTR(-ENOMEM);
 119
 120         spin_lock_irqsave(&dev->n_ahs_lock, flags);
 121         if (dev->n_ahs_allocated == dev->dparms.props.max_ah) {
 122                 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
 123                 kfree(ah);
 124                 return ERR_PTR(-ENOMEM);
 125         }
 126
 127         dev->n_ahs_allocated++;
 128         spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
 129
 130         ah->attr = *ah_attr;
 131         atomic_set(&ah->refcount, 0);
 132
 133         if (dev->driver_f.notify_new_ah)
 134                 dev->driver_f.notify_new_ah(pd->device, ah_attr, ah);
 135
 136         return &ah->ibah;
 137 }
 138
 139 /**
 140  * rvt_destory_ah - Destory an address handle
 141  * @ibah: address handle
 142  *
 143  * Return: 0 on success
 144  */
 145 int rvt_destroy_ah(struct ib_ah *ibah)
 146 {
 147         struct rvt_dev_info *dev = ib_to_rvt(ibah->device);
 148         struct rvt_ah *ah = ibah_to_rvtah(ibah);
 149         unsigned long flags;
 150
 151         if (atomic_read(&ah->refcount) != 0)
 152                 return -EBUSY;
 153
 154         spin_lock_irqsave(&dev->n_ahs_lock, flags);
 155         dev->n_ahs_allocated--;
 156         spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
 157
 158         kfree(ah);
 159
 160         return 0;
 161 }
 162
 163 /**
 164  * rvt_modify_ah - modify an ah with given attrs
 165  * @ibah: address handle to modify
 166  * @ah_attr: attrs to apply
 167  *
 168  * Return: 0 on success
 169  */
 170 int rvt_modify_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
 171 {
 172         struct rvt_ah *ah = ibah_to_rvtah(ibah);
 173
 174         if (rvt_check_ah(ibah->device, ah_attr))
 175                 return -EINVAL;
 176
 177         ah->attr = *ah_attr;
 178
 179         return 0;
 180 }
 181
 182 /**
 183  * rvt_query_ah - return attrs for ah
 184  * @ibah: address handle to query
 185  * @ah_attr: return info in this
 186  *
 187  * Return: always 0
 188  */
 189 int rvt_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
 190 {
 191         struct rvt_ah *ah = ibah_to_rvtah(ibah);
 192
 193         *ah_attr = ah->attr;
 194
 195         return 0;
 196 }