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 int pvrdma_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, 56 struct ib_recv_wr **bad_wr) 57 { 58 /* No support for kernel clients. */ 59 return -EOPNOTSUPP; 60 } 61 62 /** 63 * pvrdma_query_srq - query shared receive queue 64 * @ibsrq: the shared receive queue to query 65 * @srq_attr: attributes to query and return to client 66 * 67 * @return: 0 for success, otherwise returns an errno. 68 */ 69 int pvrdma_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) 70 { 71 struct pvrdma_dev *dev = to_vdev(ibsrq->device); 72 struct pvrdma_srq *srq = to_vsrq(ibsrq); 73 union pvrdma_cmd_req req; 74 union pvrdma_cmd_resp rsp; 75 struct pvrdma_cmd_query_srq *cmd = &req.query_srq; 76 struct pvrdma_cmd_query_srq_resp *resp = &rsp.query_srq_resp; 77 int ret; 78 79 memset(cmd, 0, sizeof(*cmd)); 80 cmd->hdr.cmd = PVRDMA_CMD_QUERY_SRQ; 81 cmd->srq_handle = srq->srq_handle; 82 83 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_SRQ_RESP); 84 if (ret < 0) { 85 dev_warn(&dev->pdev->dev, 86 "could not query shared receive queue, error: %d\n", 87 ret); 88 return -EINVAL; 89 } 90 91 srq_attr->srq_limit = resp->attrs.srq_limit; 92 srq_attr->max_wr = resp->attrs.max_wr; 93 srq_attr->max_sge = resp->attrs.max_sge; 94 95 return 0; 96 } 97 98 /** 99 * pvrdma_create_srq - create shared receive queue 100 * @pd: protection domain 101 * @init_attr: shared receive queue attributes 102 * @udata: user data 103 * 104 * @return: the ib_srq pointer on success, otherwise returns an errno. 105 */ 106 struct ib_srq *pvrdma_create_srq(struct ib_pd *pd, 107 struct ib_srq_init_attr *init_attr, 108 struct ib_udata *udata) 109 { 110 struct pvrdma_srq *srq = NULL; 111 struct pvrdma_dev *dev = to_vdev(pd->device); 112 union pvrdma_cmd_req req; 113 union pvrdma_cmd_resp rsp; 114 struct pvrdma_cmd_create_srq *cmd = &req.create_srq; 115 struct pvrdma_cmd_create_srq_resp *resp = &rsp.create_srq_resp; 116 struct pvrdma_create_srq_resp srq_resp = {0}; 117 struct pvrdma_create_srq ucmd; 118 unsigned long flags; 119 int ret; 120 121 if (!(pd->uobject && udata)) { 122 /* No support for kernel clients. */ 123 dev_warn(&dev->pdev->dev, 124 "no shared receive queue support for kernel client\n"); 125 return ERR_PTR(-EOPNOTSUPP); 126 } 127 128 if (init_attr->srq_type != IB_SRQT_BASIC) { 129 dev_warn(&dev->pdev->dev, 130 "shared receive queue type %d not supported\n", 131 init_attr->srq_type); 132 return ERR_PTR(-EINVAL); 133 } 134 135 if (init_attr->attr.max_wr > dev->dsr->caps.max_srq_wr || 136 init_attr->attr.max_sge > dev->dsr->caps.max_srq_sge) { 137 dev_warn(&dev->pdev->dev, 138 "shared receive queue size invalid\n"); 139 return ERR_PTR(-EINVAL); 140 } 141 142 if (!atomic_add_unless(&dev->num_srqs, 1, dev->dsr->caps.max_srq)) 143 return ERR_PTR(-ENOMEM); 144 145 srq = kmalloc(sizeof(*srq), GFP_KERNEL); 146 if (!srq) { 147 ret = -ENOMEM; 148 goto err_srq; 149 } 150 151 spin_lock_init(&srq->lock); 152 refcount_set(&srq->refcnt, 1); 153 init_completion(&srq->free); 154 155 dev_dbg(&dev->pdev->dev, 156 "create shared receive queue from user space\n"); 157 158 if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) { 159 ret = -EFAULT; 160 goto err_srq; 161 } 162 163 srq->umem = ib_umem_get(pd->uobject->context, 164 ucmd.buf_addr, 165 ucmd.buf_size, 0, 0); 166 if (IS_ERR(srq->umem)) { 167 ret = PTR_ERR(srq->umem); 168 goto err_srq; 169 } 170 171 srq->npages = ib_umem_page_count(srq->umem); 172 173 if (srq->npages < 0 || srq->npages > PVRDMA_PAGE_DIR_MAX_PAGES) { 174 dev_warn(&dev->pdev->dev, 175 "overflow pages in shared receive queue\n"); 176 ret = -EINVAL; 177 goto err_umem; 178 } 179 180 ret = pvrdma_page_dir_init(dev, &srq->pdir, srq->npages, false); 181 if (ret) { 182 dev_warn(&dev->pdev->dev, 183 "could not allocate page directory\n"); 184 goto err_umem; 185 } 186 187 pvrdma_page_dir_insert_umem(&srq->pdir, srq->umem, 0); 188 189 memset(cmd, 0, sizeof(*cmd)); 190 cmd->hdr.cmd = PVRDMA_CMD_CREATE_SRQ; 191 cmd->srq_type = init_attr->srq_type; 192 cmd->nchunks = srq->npages; 193 cmd->pd_handle = to_vpd(pd)->pd_handle; 194 cmd->attrs.max_wr = init_attr->attr.max_wr; 195 cmd->attrs.max_sge = init_attr->attr.max_sge; 196 cmd->attrs.srq_limit = init_attr->attr.srq_limit; 197 cmd->pdir_dma = srq->pdir.dir_dma; 198 199 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_SRQ_RESP); 200 if (ret < 0) { 201 dev_warn(&dev->pdev->dev, 202 "could not create shared receive queue, error: %d\n", 203 ret); 204 goto err_page_dir; 205 } 206 207 srq->srq_handle = resp->srqn; 208 srq_resp.srqn = resp->srqn; 209 spin_lock_irqsave(&dev->srq_tbl_lock, flags); 210 dev->srq_tbl[srq->srq_handle % dev->dsr->caps.max_srq] = srq; 211 spin_unlock_irqrestore(&dev->srq_tbl_lock, flags); 212 213 /* Copy udata back. */ 214 if (ib_copy_to_udata(udata, &srq_resp, sizeof(srq_resp))) { 215 dev_warn(&dev->pdev->dev, "failed to copy back udata\n"); 216 pvrdma_destroy_srq(&srq->ibsrq); 217 return ERR_PTR(-EINVAL); 218 } 219 220 return &srq->ibsrq; 221 222 err_page_dir: 223 pvrdma_page_dir_cleanup(dev, &srq->pdir); 224 err_umem: 225 ib_umem_release(srq->umem); 226 err_srq: 227 kfree(srq); 228 atomic_dec(&dev->num_srqs); 229 230 return ERR_PTR(ret); 231 } 232 233 static void pvrdma_free_srq(struct pvrdma_dev *dev, struct pvrdma_srq *srq) 234 { 235 unsigned long flags; 236 237 spin_lock_irqsave(&dev->srq_tbl_lock, flags); 238 dev->srq_tbl[srq->srq_handle] = NULL; 239 spin_unlock_irqrestore(&dev->srq_tbl_lock, flags); 240 241 if (refcount_dec_and_test(&srq->refcnt)) 242 complete(&srq->free); 243 wait_for_completion(&srq->free); 244 245 /* There is no support for kernel clients, so this is safe. */ 246 ib_umem_release(srq->umem); 247 248 pvrdma_page_dir_cleanup(dev, &srq->pdir); 249 250 kfree(srq); 251 252 atomic_dec(&dev->num_srqs); 253 } 254 255 /** 256 * pvrdma_destroy_srq - destroy shared receive queue 257 * @srq: the shared receive queue to destroy 258 * 259 * @return: 0 for success. 260 */ 261 int pvrdma_destroy_srq(struct ib_srq *srq) 262 { 263 struct pvrdma_srq *vsrq = to_vsrq(srq); 264 union pvrdma_cmd_req req; 265 struct pvrdma_cmd_destroy_srq *cmd = &req.destroy_srq; 266 struct pvrdma_dev *dev = to_vdev(srq->device); 267 int ret; 268 269 memset(cmd, 0, sizeof(*cmd)); 270 cmd->hdr.cmd = PVRDMA_CMD_DESTROY_SRQ; 271 cmd->srq_handle = vsrq->srq_handle; 272 273 ret = pvrdma_cmd_post(dev, &req, NULL, 0); 274 if (ret < 0) 275 dev_warn(&dev->pdev->dev, 276 "destroy shared receive queue failed, error: %d\n", 277 ret); 278 279 pvrdma_free_srq(dev, vsrq); 280 281 return 0; 282 } 283 284 /** 285 * pvrdma_modify_srq - modify shared receive queue attributes 286 * @ibsrq: the shared receive queue to modify 287 * @attr: the shared receive queue's new attributes 288 * @attr_mask: attributes mask 289 * @udata: user data 290 * 291 * @returns 0 on success, otherwise returns an errno. 292 */ 293 int pvrdma_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, 294 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) 295 { 296 struct pvrdma_srq *vsrq = to_vsrq(ibsrq); 297 union pvrdma_cmd_req req; 298 struct pvrdma_cmd_modify_srq *cmd = &req.modify_srq; 299 struct pvrdma_dev *dev = to_vdev(ibsrq->device); 300 int ret; 301 302 /* Only support SRQ limit. */ 303 if (!(attr_mask & IB_SRQ_LIMIT)) 304 return -EINVAL; 305 306 memset(cmd, 0, sizeof(*cmd)); 307 cmd->hdr.cmd = PVRDMA_CMD_MODIFY_SRQ; 308 cmd->srq_handle = vsrq->srq_handle; 309 cmd->attrs.srq_limit = attr->srq_limit; 310 cmd->attr_mask = attr_mask; 311 312 ret = pvrdma_cmd_post(dev, &req, NULL, 0); 313 if (ret < 0) { 314 dev_warn(&dev->pdev->dev, 315 "could not modify shared receive queue, error: %d\n", 316 ret); 317 318 return -EINVAL; 319 } 320 321 return ret; 322 } 323