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: the ib_srq pointer on success, otherwise returns an errno. 98 */ 99 struct ib_srq *pvrdma_create_srq(struct ib_pd *pd, 100 struct ib_srq_init_attr *init_attr, 101 struct ib_udata *udata) 102 { 103 struct pvrdma_srq *srq = NULL; 104 struct pvrdma_dev *dev = to_vdev(pd->device); 105 union pvrdma_cmd_req req; 106 union pvrdma_cmd_resp rsp; 107 struct pvrdma_cmd_create_srq *cmd = &req.create_srq; 108 struct pvrdma_cmd_create_srq_resp *resp = &rsp.create_srq_resp; 109 struct pvrdma_create_srq_resp srq_resp = {0}; 110 struct pvrdma_create_srq ucmd; 111 unsigned long flags; 112 int ret; 113 114 if (!(pd->uobject && udata)) { 115 /* No support for kernel clients. */ 116 dev_warn(&dev->pdev->dev, 117 "no shared receive queue support for kernel client\n"); 118 return ERR_PTR(-EOPNOTSUPP); 119 } 120 121 if (init_attr->srq_type != IB_SRQT_BASIC) { 122 dev_warn(&dev->pdev->dev, 123 "shared receive queue type %d not supported\n", 124 init_attr->srq_type); 125 return ERR_PTR(-EINVAL); 126 } 127 128 if (init_attr->attr.max_wr > dev->dsr->caps.max_srq_wr || 129 init_attr->attr.max_sge > dev->dsr->caps.max_srq_sge) { 130 dev_warn(&dev->pdev->dev, 131 "shared receive queue size invalid\n"); 132 return ERR_PTR(-EINVAL); 133 } 134 135 if (!atomic_add_unless(&dev->num_srqs, 1, dev->dsr->caps.max_srq)) 136 return ERR_PTR(-ENOMEM); 137 138 srq = kmalloc(sizeof(*srq), GFP_KERNEL); 139 if (!srq) { 140 ret = -ENOMEM; 141 goto err_srq; 142 } 143 144 spin_lock_init(&srq->lock); 145 refcount_set(&srq->refcnt, 1); 146 init_completion(&srq->free); 147 148 dev_dbg(&dev->pdev->dev, 149 "create shared receive queue from user space\n"); 150 151 if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) { 152 ret = -EFAULT; 153 goto err_srq; 154 } 155 156 srq->umem = ib_umem_get(pd->uobject->context, 157 ucmd.buf_addr, 158 ucmd.buf_size, 0, 0); 159 if (IS_ERR(srq->umem)) { 160 ret = PTR_ERR(srq->umem); 161 goto err_srq; 162 } 163 164 srq->npages = ib_umem_page_count(srq->umem); 165 166 if (srq->npages < 0 || srq->npages > PVRDMA_PAGE_DIR_MAX_PAGES) { 167 dev_warn(&dev->pdev->dev, 168 "overflow pages in shared receive queue\n"); 169 ret = -EINVAL; 170 goto err_umem; 171 } 172 173 ret = pvrdma_page_dir_init(dev, &srq->pdir, srq->npages, false); 174 if (ret) { 175 dev_warn(&dev->pdev->dev, 176 "could not allocate page directory\n"); 177 goto err_umem; 178 } 179 180 pvrdma_page_dir_insert_umem(&srq->pdir, srq->umem, 0); 181 182 memset(cmd, 0, sizeof(*cmd)); 183 cmd->hdr.cmd = PVRDMA_CMD_CREATE_SRQ; 184 cmd->srq_type = init_attr->srq_type; 185 cmd->nchunks = srq->npages; 186 cmd->pd_handle = to_vpd(pd)->pd_handle; 187 cmd->attrs.max_wr = init_attr->attr.max_wr; 188 cmd->attrs.max_sge = init_attr->attr.max_sge; 189 cmd->attrs.srq_limit = init_attr->attr.srq_limit; 190 cmd->pdir_dma = srq->pdir.dir_dma; 191 192 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_SRQ_RESP); 193 if (ret < 0) { 194 dev_warn(&dev->pdev->dev, 195 "could not create shared receive queue, error: %d\n", 196 ret); 197 goto err_page_dir; 198 } 199 200 srq->srq_handle = resp->srqn; 201 srq_resp.srqn = resp->srqn; 202 spin_lock_irqsave(&dev->srq_tbl_lock, flags); 203 dev->srq_tbl[srq->srq_handle % dev->dsr->caps.max_srq] = srq; 204 spin_unlock_irqrestore(&dev->srq_tbl_lock, flags); 205 206 /* Copy udata back. */ 207 if (ib_copy_to_udata(udata, &srq_resp, sizeof(srq_resp))) { 208 dev_warn(&dev->pdev->dev, "failed to copy back udata\n"); 209 pvrdma_destroy_srq(&srq->ibsrq); 210 return ERR_PTR(-EINVAL); 211 } 212 213 return &srq->ibsrq; 214 215 err_page_dir: 216 pvrdma_page_dir_cleanup(dev, &srq->pdir); 217 err_umem: 218 ib_umem_release(srq->umem); 219 err_srq: 220 kfree(srq); 221 atomic_dec(&dev->num_srqs); 222 223 return ERR_PTR(ret); 224 } 225 226 static void pvrdma_free_srq(struct pvrdma_dev *dev, struct pvrdma_srq *srq) 227 { 228 unsigned long flags; 229 230 spin_lock_irqsave(&dev->srq_tbl_lock, flags); 231 dev->srq_tbl[srq->srq_handle] = NULL; 232 spin_unlock_irqrestore(&dev->srq_tbl_lock, flags); 233 234 if (refcount_dec_and_test(&srq->refcnt)) 235 complete(&srq->free); 236 wait_for_completion(&srq->free); 237 238 /* There is no support for kernel clients, so this is safe. */ 239 ib_umem_release(srq->umem); 240 241 pvrdma_page_dir_cleanup(dev, &srq->pdir); 242 243 kfree(srq); 244 245 atomic_dec(&dev->num_srqs); 246 } 247 248 /** 249 * pvrdma_destroy_srq - destroy shared receive queue 250 * @srq: the shared receive queue to destroy 251 * 252 * @return: 0 for success. 253 */ 254 int pvrdma_destroy_srq(struct ib_srq *srq) 255 { 256 struct pvrdma_srq *vsrq = to_vsrq(srq); 257 union pvrdma_cmd_req req; 258 struct pvrdma_cmd_destroy_srq *cmd = &req.destroy_srq; 259 struct pvrdma_dev *dev = to_vdev(srq->device); 260 int ret; 261 262 memset(cmd, 0, sizeof(*cmd)); 263 cmd->hdr.cmd = PVRDMA_CMD_DESTROY_SRQ; 264 cmd->srq_handle = vsrq->srq_handle; 265 266 ret = pvrdma_cmd_post(dev, &req, NULL, 0); 267 if (ret < 0) 268 dev_warn(&dev->pdev->dev, 269 "destroy shared receive queue failed, error: %d\n", 270 ret); 271 272 pvrdma_free_srq(dev, vsrq); 273 274 return 0; 275 } 276 277 /** 278 * pvrdma_modify_srq - modify shared receive queue attributes 279 * @ibsrq: the shared receive queue to modify 280 * @attr: the shared receive queue's new attributes 281 * @attr_mask: attributes mask 282 * @udata: user data 283 * 284 * @returns 0 on success, otherwise returns an errno. 285 */ 286 int pvrdma_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, 287 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) 288 { 289 struct pvrdma_srq *vsrq = to_vsrq(ibsrq); 290 union pvrdma_cmd_req req; 291 struct pvrdma_cmd_modify_srq *cmd = &req.modify_srq; 292 struct pvrdma_dev *dev = to_vdev(ibsrq->device); 293 int ret; 294 295 /* Only support SRQ limit. */ 296 if (!(attr_mask & IB_SRQ_LIMIT)) 297 return -EINVAL; 298 299 memset(cmd, 0, sizeof(*cmd)); 300 cmd->hdr.cmd = PVRDMA_CMD_MODIFY_SRQ; 301 cmd->srq_handle = vsrq->srq_handle; 302 cmd->attrs.srq_limit = attr->srq_limit; 303 cmd->attr_mask = attr_mask; 304 305 ret = pvrdma_cmd_post(dev, &req, NULL, 0); 306 if (ret < 0) { 307 dev_warn(&dev->pdev->dev, 308 "could not modify shared receive queue, error: %d\n", 309 ret); 310 311 return -EINVAL; 312 } 313 314 return ret; 315 } 316