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 enum rdma_link_layer link = rdma_port_get_link_layer(ibdev, port_num); 70 u32 dlid = rdma_ah_get_dlid(ah_attr); 71 u8 ah_flags = rdma_ah_get_ah_flags(ah_attr); 72 u8 static_rate = rdma_ah_get_static_rate(ah_attr); 73 74 err = ib_query_port(ibdev, port_num, &port_attr); 75 if (err) 76 return -EINVAL; 77 if (port_num < 1 || 78 port_num > ibdev->phys_port_cnt) 79 return -EINVAL; 80 if (static_rate != IB_RATE_PORT_CURRENT && 81 ib_rate_to_mbps(static_rate) < 0) 82 return -EINVAL; 83 if ((ah_flags & IB_AH_GRH) && 84 rdma_ah_read_grh(ah_attr)->sgid_index >= port_attr.gid_tbl_len) 85 return -EINVAL; 86 if (link != IB_LINK_LAYER_ETHERNET) { 87 if (dlid == 0) 88 return -EINVAL; 89 if (dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE) && 90 dlid != be16_to_cpu(IB_LID_PERMISSIVE) && 91 !(ah_flags & IB_AH_GRH)) 92 return -EINVAL; 93 } 94 if (rdi->driver_f.check_ah) 95 return rdi->driver_f.check_ah(ibdev, ah_attr); 96 return 0; 97 } 98 EXPORT_SYMBOL(rvt_check_ah); 99 100 /** 101 * rvt_create_ah - create an address handle 102 * @pd: the protection domain 103 * @ah_attr: the attributes of the AH 104 * 105 * This may be called from interrupt context. 106 * 107 * Return: newly allocated ah 108 */ 109 struct ib_ah *rvt_create_ah(struct ib_pd *pd, 110 struct rdma_ah_attr *ah_attr) 111 { 112 struct rvt_ah *ah; 113 struct rvt_dev_info *dev = ib_to_rvt(pd->device); 114 unsigned long flags; 115 116 if (rvt_check_ah(pd->device, ah_attr)) 117 return ERR_PTR(-EINVAL); 118 119 ah = kmalloc(sizeof(*ah), GFP_ATOMIC); 120 if (!ah) 121 return ERR_PTR(-ENOMEM); 122 123 spin_lock_irqsave(&dev->n_ahs_lock, flags); 124 if (dev->n_ahs_allocated == dev->dparms.props.max_ah) { 125 spin_unlock_irqrestore(&dev->n_ahs_lock, flags); 126 kfree(ah); 127 return ERR_PTR(-ENOMEM); 128 } 129 130 dev->n_ahs_allocated++; 131 spin_unlock_irqrestore(&dev->n_ahs_lock, flags); 132 133 ah->attr = *ah_attr; 134 atomic_set(&ah->refcount, 0); 135 136 if (dev->driver_f.notify_new_ah) 137 dev->driver_f.notify_new_ah(pd->device, ah_attr, ah); 138 139 return &ah->ibah; 140 } 141 142 /** 143 * rvt_destory_ah - Destory an address handle 144 * @ibah: address handle 145 * 146 * Return: 0 on success 147 */ 148 int rvt_destroy_ah(struct ib_ah *ibah) 149 { 150 struct rvt_dev_info *dev = ib_to_rvt(ibah->device); 151 struct rvt_ah *ah = ibah_to_rvtah(ibah); 152 unsigned long flags; 153 154 if (atomic_read(&ah->refcount) != 0) 155 return -EBUSY; 156 157 spin_lock_irqsave(&dev->n_ahs_lock, flags); 158 dev->n_ahs_allocated--; 159 spin_unlock_irqrestore(&dev->n_ahs_lock, flags); 160 161 kfree(ah); 162 163 return 0; 164 } 165 166 /** 167 * rvt_modify_ah - modify an ah with given attrs 168 * @ibah: address handle to modify 169 * @ah_attr: attrs to apply 170 * 171 * Return: 0 on success 172 */ 173 int rvt_modify_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr) 174 { 175 struct rvt_ah *ah = ibah_to_rvtah(ibah); 176 177 if (rvt_check_ah(ibah->device, ah_attr)) 178 return -EINVAL; 179 180 ah->attr = *ah_attr; 181 182 return 0; 183 } 184 185 /** 186 * rvt_query_ah - return attrs for ah 187 * @ibah: address handle to query 188 * @ah_attr: return info in this 189 * 190 * Return: always 0 191 */ 192 int rvt_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr) 193 { 194 struct rvt_ah *ah = ibah_to_rvtah(ibah); 195 196 *ah_attr = ah->attr; 197 198 return 0; 199 } 200