1 /* 2 * Copyright(c) 2016 - 2019 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 * @ibah: the IB address handle 93 * @init_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: 0 on success 99 */ 100 int rvt_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr, 101 struct ib_udata *udata) 102 { 103 struct rvt_ah *ah = ibah_to_rvtah(ibah); 104 struct rvt_dev_info *dev = ib_to_rvt(ibah->device); 105 unsigned long flags; 106 107 if (rvt_check_ah(ibah->device, init_attr->ah_attr)) 108 return -EINVAL; 109 110 spin_lock_irqsave(&dev->n_ahs_lock, flags); 111 if (dev->n_ahs_allocated == dev->dparms.props.max_ah) { 112 spin_unlock_irqrestore(&dev->n_ahs_lock, flags); 113 return -ENOMEM; 114 } 115 116 dev->n_ahs_allocated++; 117 spin_unlock_irqrestore(&dev->n_ahs_lock, flags); 118 119 rdma_copy_ah_attr(&ah->attr, init_attr->ah_attr); 120 121 if (dev->driver_f.notify_new_ah) 122 dev->driver_f.notify_new_ah(ibah->device, 123 init_attr->ah_attr, ah); 124 125 return 0; 126 } 127 128 /** 129 * rvt_destory_ah - Destory an address handle 130 * @ibah: address handle 131 * @destroy_flags: destroy address handle flags (see enum rdma_destroy_ah_flags) 132 * 133 * Return: 0 on success 134 */ 135 int rvt_destroy_ah(struct ib_ah *ibah, u32 destroy_flags) 136 { 137 struct rvt_dev_info *dev = ib_to_rvt(ibah->device); 138 struct rvt_ah *ah = ibah_to_rvtah(ibah); 139 unsigned long flags; 140 141 spin_lock_irqsave(&dev->n_ahs_lock, flags); 142 dev->n_ahs_allocated--; 143 spin_unlock_irqrestore(&dev->n_ahs_lock, flags); 144 145 rdma_destroy_ah_attr(&ah->attr); 146 return 0; 147 } 148 149 /** 150 * rvt_modify_ah - modify an ah with given attrs 151 * @ibah: address handle to modify 152 * @ah_attr: attrs to apply 153 * 154 * Return: 0 on success 155 */ 156 int rvt_modify_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr) 157 { 158 struct rvt_ah *ah = ibah_to_rvtah(ibah); 159 160 if (rvt_check_ah(ibah->device, ah_attr)) 161 return -EINVAL; 162 163 ah->attr = *ah_attr; 164 165 return 0; 166 } 167 168 /** 169 * rvt_query_ah - return attrs for ah 170 * @ibah: address handle to query 171 * @ah_attr: return info in this 172 * 173 * Return: always 0 174 */ 175 int rvt_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr) 176 { 177 struct rvt_ah *ah = ibah_to_rvtah(ibah); 178 179 *ah_attr = ah->attr; 180 181 return 0; 182 } 183