drivers/infiniband/hw/vmw_pvrdma/pvrdma_srq.c

   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 }