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 } 190