1 /* 2 * Copyright (c) 2016-2017 VMware, Inc. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of EITHER the GNU General Public License 6 * version 2 as published by the Free Software Foundation or the BSD 7 * 2-Clause License. This program is distributed in the hope that it 8 * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED 9 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 10 * See the GNU General Public License version 2 for more details at 11 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program available in the file COPYING in the main 15 * directory of this source tree. 16 * 17 * The BSD 2-Clause License 18 * 19 * Redistribution and use in source and binary forms, with or 20 * without modification, are permitted provided that the following 21 * conditions are met: 22 * 23 * - Redistributions of source code must retain the above 24 * copyright notice, this list of conditions and the following 25 * disclaimer. 26 * 27 * - Redistributions in binary form must reproduce the above 28 * copyright notice, this list of conditions and the following 29 * disclaimer in the documentation and/or other materials 30 * provided with the distribution. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 35 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 36 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 37 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 38 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 39 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 42 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 43 * OF THE POSSIBILITY OF SUCH DAMAGE. 44 */ 45 46 #include <asm/page.h> 47 #include <linux/io.h> 48 #include <linux/wait.h> 49 #include <rdma/ib_addr.h> 50 #include <rdma/ib_smi.h> 51 #include <rdma/ib_user_verbs.h> 52 53 #include "pvrdma.h" 54 55 /** 56 * pvrdma_query_srq - query shared receive queue 57 * @ibsrq: the shared receive queue to query 58 * @srq_attr: attributes to query and return to client 59 * 60 * @return: 0 for success, otherwise returns an errno. 61 */ 62 int pvrdma_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) 63 { 64 struct pvrdma_dev *dev = to_vdev(ibsrq->device); 65 struct pvrdma_srq *srq = to_vsrq(ibsrq); 66 union pvrdma_cmd_req req; 67 union pvrdma_cmd_resp rsp; 68 struct pvrdma_cmd_query_srq *cmd = &req.query_srq; 69 struct pvrdma_cmd_query_srq_resp *resp = &rsp.query_srq_resp; 70 int ret; 71 72 memset(cmd, 0, sizeof(*cmd)); 73 cmd->hdr.cmd = PVRDMA_CMD_QUERY_SRQ; 74 cmd->srq_handle = srq->srq_handle; 75 76 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_SRQ_RESP); 77 if (ret < 0) { 78 dev_warn(&dev->pdev->dev, 79 "could not query shared receive queue, error: %d\n", 80 ret); 81 return -EINVAL; 82 } 83 84 srq_attr->srq_limit = resp->attrs.srq_limit; 85 srq_attr->max_wr = resp->attrs.max_wr; 86 srq_attr->max_sge = resp->attrs.max_sge; 87 88 return 0; 89 } 90 91 /** 92 * pvrdma_create_srq - create shared receive queue 93 * @pd: protection domain 94 * @init_attr: shared receive queue attributes 95 * @udata: user data 96 * 97 * @return: 0 on success, otherwise returns an errno. 98 */ 99 int pvrdma_create_srq(struct ib_srq *ibsrq, struct ib_srq_init_attr *init_attr, 100 struct ib_udata *udata) 101 { 102 struct pvrdma_srq *srq = to_vsrq(ibsrq); 103 struct pvrdma_dev *dev = to_vdev(ibsrq->device); 104 union pvrdma_cmd_req req; 105 union pvrdma_cmd_resp rsp; 106 struct pvrdma_cmd_create_srq *cmd = &req.create_srq; 107 struct pvrdma_cmd_create_srq_resp *resp = &rsp.create_srq_resp; 108 struct pvrdma_create_srq_resp srq_resp = {}; 109 struct pvrdma_create_srq ucmd; 110 unsigned long flags; 111 int ret; 112 113 if (!udata) { 114 /* No support for kernel clients. */ 115 dev_warn(&dev->pdev->dev, 116 "no shared receive queue support for kernel client\n"); 117 return -EOPNOTSUPP; 118 } 119 120 if (init_attr->srq_type != IB_SRQT_BASIC) { 121 dev_warn(&dev->pdev->dev, 122 "shared receive queue type %d not supported\n", 123 init_attr->srq_type); 124 return -EINVAL; 125 } 126 127 if (init_attr->attr.max_wr > dev->dsr->caps.max_srq_wr || 128 init_attr->attr.max_sge > dev->dsr->caps.max_srq_sge) { 129 dev_warn(&dev->pdev->dev, 130 "shared receive queue size invalid\n"); 131 return -EINVAL; 132 } 133 134 if (!atomic_add_unless(&dev->num_srqs, 1, dev->dsr->caps.max_srq)) 135 return -ENOMEM; 136 137 spin_lock_init(&srq->lock); 138 refcount_set(&srq->refcnt, 1); 139 init_completion(&srq->free); 140 141 dev_dbg(&dev->pdev->dev, 142 "create shared receive queue from user space\n"); 143 144 if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) { 145 ret = -EFAULT; 146 goto err_srq; 147 } 148 149 srq->umem = ib_umem_get(ibsrq->device, ucmd.buf_addr, ucmd.buf_size, 0); 150 if (IS_ERR(srq->umem)) { 151 ret = PTR_ERR(srq->umem); 152 goto err_srq; 153 } 154 155 srq->npages = ib_umem_page_count(srq->umem); 156 157 if (srq->npages < 0 || srq->npages > PVRDMA_PAGE_DIR_MAX_PAGES) { 158 dev_warn(&dev->pdev->dev, 159 "overflow pages in shared receive queue\n"); 160 ret = -EINVAL; 161 goto err_umem; 162 } 163 164 ret = pvrdma_page_dir_init(dev, &srq->pdir, srq->npages, false); 165 if (ret) { 166 dev_warn(&dev->pdev->dev, 167 "could not allocate page directory\n"); 168 goto err_umem; 169 } 170 171 pvrdma_page_dir_insert_umem(&srq->pdir, srq->umem, 0); 172 173 memset(cmd, 0, sizeof(*cmd)); 174 cmd->hdr.cmd = PVRDMA_CMD_CREATE_SRQ; 175 cmd->srq_type = init_attr->srq_type; 176 cmd->nchunks = srq->npages; 177 cmd->pd_handle = to_vpd(ibsrq->pd)->pd_handle; 178 cmd->attrs.max_wr = init_attr->attr.max_wr; 179 cmd->attrs.max_sge = init_attr->attr.max_sge; 180 cmd->attrs.srq_limit = init_attr->attr.srq_limit; 181 cmd->pdir_dma = srq->pdir.dir_dma; 182 183 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_SRQ_RESP); 184 if (ret < 0) { 185 dev_warn(&dev->pdev->dev, 186 "could not create shared receive queue, error: %d\n", 187 ret); 188 goto err_page_dir; 189 } 190 191 srq->srq_handle = resp->srqn; 192 srq_resp.srqn = resp->srqn; 193 spin_lock_irqsave(&dev->srq_tbl_lock, flags); 194 dev->srq_tbl[srq->srq_handle % dev->dsr->caps.max_srq] = srq; 195 spin_unlock_irqrestore(&dev->srq_tbl_lock, flags); 196 197 /* Copy udata back. */ 198 if (ib_copy_to_udata(udata, &srq_resp, sizeof(srq_resp))) { 199 dev_warn(&dev->pdev->dev, "failed to copy back udata\n"); 200 pvrdma_destroy_srq(&srq->ibsrq, udata); 201 return -EINVAL; 202 } 203 204 return 0; 205 206 err_page_dir: 207 pvrdma_page_dir_cleanup(dev, &srq->pdir); 208 err_umem: 209 ib_umem_release(srq->umem); 210 err_srq: 211 atomic_dec(&dev->num_srqs); 212 213 return ret; 214 } 215 216 static void pvrdma_free_srq(struct pvrdma_dev *dev, struct pvrdma_srq *srq) 217 { 218 unsigned long flags; 219 220 spin_lock_irqsave(&dev->srq_tbl_lock, flags); 221 dev->srq_tbl[srq->srq_handle] = NULL; 222 spin_unlock_irqrestore(&dev->srq_tbl_lock, flags); 223 224 if (refcount_dec_and_test(&srq->refcnt)) 225 complete(&srq->free); 226 wait_for_completion(&srq->free); 227 228 /* There is no support for kernel clients, so this is safe. */ 229 ib_umem_release(srq->umem); 230 231 pvrdma_page_dir_cleanup(dev, &srq->pdir); 232 233 atomic_dec(&dev->num_srqs); 234 } 235 236 /** 237 * pvrdma_destroy_srq - destroy shared receive queue 238 * @srq: the shared receive queue to destroy 239 * @udata: user data or null for kernel object 240 * 241 * @return: 0 for success. 242 */ 243 void pvrdma_destroy_srq(struct ib_srq *srq, struct ib_udata *udata) 244 { 245 struct pvrdma_srq *vsrq = to_vsrq(srq); 246 union pvrdma_cmd_req req; 247 struct pvrdma_cmd_destroy_srq *cmd = &req.destroy_srq; 248 struct pvrdma_dev *dev = to_vdev(srq->device); 249 int ret; 250 251 memset(cmd, 0, sizeof(*cmd)); 252 cmd->hdr.cmd = PVRDMA_CMD_DESTROY_SRQ; 253 cmd->srq_handle = vsrq->srq_handle; 254 255 ret = pvrdma_cmd_post(dev, &req, NULL, 0); 256 if (ret < 0) 257 dev_warn(&dev->pdev->dev, 258 "destroy shared receive queue failed, error: %d\n", 259 ret); 260 261 pvrdma_free_srq(dev, vsrq); 262 } 263 264 /** 265 * pvrdma_modify_srq - modify shared receive queue attributes 266 * @ibsrq: the shared receive queue to modify 267 * @attr: the shared receive queue's new attributes 268 * @attr_mask: attributes mask 269 * @udata: user data 270 * 271 * @returns 0 on success, otherwise returns an errno. 272 */ 273 int pvrdma_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, 274 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) 275 { 276 struct pvrdma_srq *vsrq = to_vsrq(ibsrq); 277 union pvrdma_cmd_req req; 278 struct pvrdma_cmd_modify_srq *cmd = &req.modify_srq; 279 struct pvrdma_dev *dev = to_vdev(ibsrq->device); 280 int ret; 281 282 /* Only support SRQ limit. */ 283 if (!(attr_mask & IB_SRQ_LIMIT)) 284 return -EINVAL; 285 286 memset(cmd, 0, sizeof(*cmd)); 287 cmd->hdr.cmd = PVRDMA_CMD_MODIFY_SRQ; 288 cmd->srq_handle = vsrq->srq_handle; 289 cmd->attrs.srq_limit = attr->srq_limit; 290 cmd->attr_mask = attr_mask; 291 292 ret = pvrdma_cmd_post(dev, &req, NULL, 0); 293 if (ret < 0) { 294 dev_warn(&dev->pdev->dev, 295 "could not modify shared receive queue, error: %d\n", 296 ret); 297 298 return -EINVAL; 299 } 300 301 return ret; 302 } 303