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 */ 62int 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} 88EXPORT_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 * @udata: pointer to user's input output buffer information. 95 * 96 * This may be called from interrupt context. 97 * 98 * Return: newly allocated ah 99 */ 100struct ib_ah *rvt_create_ah(struct ib_pd *pd, 101 struct rdma_ah_attr *ah_attr, 102 struct ib_udata *udata) 103{ 104 struct rvt_ah *ah; 105 struct rvt_dev_info *dev = ib_to_rvt(pd->device); 106 unsigned long flags; 107 108 if (rvt_check_ah(pd->device, ah_attr)) 109 return ERR_PTR(-EINVAL); 110 111 ah = kmalloc(sizeof(*ah), GFP_ATOMIC); 112 if (!ah) 113 return ERR_PTR(-ENOMEM); 114 115 spin_lock_irqsave(&dev->n_ahs_lock, flags); 116 if (dev->n_ahs_allocated == dev->dparms.props.max_ah) { 117 spin_unlock_irqrestore(&dev->n_ahs_lock, flags); 118 kfree(ah); 119 return ERR_PTR(-ENOMEM); 120 } 121 122 dev->n_ahs_allocated++; 123 spin_unlock_irqrestore(&dev->n_ahs_lock, flags); 124 125 rdma_copy_ah_attr(&ah->attr, ah_attr); 126 127 atomic_set(&ah->refcount, 0); 128 129 if (dev->driver_f.notify_new_ah) 130 dev->driver_f.notify_new_ah(pd->device, ah_attr, ah); 131 132 return &ah->ibah; 133} 134 135/** 136 * rvt_destory_ah - Destory an address handle 137 * @ibah: address handle 138 * 139 * Return: 0 on success 140 */ 141int rvt_destroy_ah(struct ib_ah *ibah) 142{ 143 struct rvt_dev_info *dev = ib_to_rvt(ibah->device); 144 struct rvt_ah *ah = ibah_to_rvtah(ibah); 145 unsigned long flags; 146 147 if (atomic_read(&ah->refcount) != 0) 148 return -EBUSY; 149 150 spin_lock_irqsave(&dev->n_ahs_lock, flags); 151 dev->n_ahs_allocated--; 152 spin_unlock_irqrestore(&dev->n_ahs_lock, flags); 153 154 rdma_destroy_ah_attr(&ah->attr); 155 kfree(ah); 156 157 return 0; 158} 159 160/** 161 * rvt_modify_ah - modify an ah with given attrs 162 * @ibah: address handle to modify 163 * @ah_attr: attrs to apply 164 * 165 * Return: 0 on success 166 */ 167int rvt_modify_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr) 168{ 169 struct rvt_ah *ah = ibah_to_rvtah(ibah); 170 171 if (rvt_check_ah(ibah->device, ah_attr)) 172 return -EINVAL; 173 174 ah->attr = *ah_attr; 175 176 return 0; 177} 178 179/** 180 * rvt_query_ah - return attrs for ah 181 * @ibah: address handle to query 182 * @ah_attr: return info in this 183 * 184 * Return: always 0 185 */ 186int rvt_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr) 187{ 188 struct rvt_ah *ah = ibah_to_rvtah(ibah); 189 190 *ah_attr = ah->attr; 191 192 return 0; 193} 194