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(&dev->n_ahs_lock); 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 } 197