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 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 ucmd;
 117         unsigned long flags;
 118         int ret;
 119
 120         if (!(pd->uobject && udata)) {
 121                 /* No support for kernel clients. */
 122                 dev_warn(&dev->pdev->dev,
 123                          "no shared receive queue support for kernel client\n");
 124                 return ERR_PTR(-EOPNOTSUPP);
 125         }
 126
 127         if (init_attr->srq_type != IB_SRQT_BASIC) {
 128                 dev_warn(&dev->pdev->dev,
 129                          "shared receive queue type %d not supported\n",
 130                          init_attr->srq_type);
 131                 return ERR_PTR(-EINVAL);
 132         }
 133
 134         if (init_attr->attr.max_wr  > dev->dsr->caps.max_srq_wr ||
 135             init_attr->attr.max_sge > dev->dsr->caps.max_srq_sge) {
 136                 dev_warn(&dev->pdev->dev,
 137                          "shared receive queue size invalid\n");
 138                 return ERR_PTR(-EINVAL);
 139         }
 140
 141         if (!atomic_add_unless(&dev->num_srqs, 1, dev->dsr->caps.max_srq))
 142                 return ERR_PTR(-ENOMEM);
 143
 144         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 145         if (!srq) {
 146                 ret = -ENOMEM;
 147                 goto err_srq;
 148         }
 149
 150         spin_lock_init(&srq->lock);
 151         refcount_set(&srq->refcnt, 1);
 152         init_completion(&srq->free);
 153
 154         dev_dbg(&dev->pdev->dev,
 155                 "create shared receive queue from user space\n");
 156
 157         if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
 158                 ret = -EFAULT;
 159                 goto err_srq;
 160         }
 161
 162         srq->umem = ib_umem_get(pd->uobject->context,
 163                                 ucmd.buf_addr,
 164                                 ucmd.buf_size, 0, 0);
 165         if (IS_ERR(srq->umem)) {
 166                 ret = PTR_ERR(srq->umem);
 167                 goto err_srq;
 168         }
 169
 170         srq->npages = ib_umem_page_count(srq->umem);
 171
 172         if (srq->npages < 0 || srq->npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
 173                 dev_warn(&dev->pdev->dev,
 174                          "overflow pages in shared receive queue\n");
 175                 ret = -EINVAL;
 176                 goto err_umem;
 177         }
 178
 179         ret = pvrdma_page_dir_init(dev, &srq->pdir, srq->npages, false);
 180         if (ret) {
 181                 dev_warn(&dev->pdev->dev,
 182                          "could not allocate page directory\n");
 183                 goto err_umem;
 184         }
 185
 186         pvrdma_page_dir_insert_umem(&srq->pdir, srq->umem, 0);
 187
 188         memset(cmd, 0, sizeof(*cmd));
 189         cmd->hdr.cmd = PVRDMA_CMD_CREATE_SRQ;
 190         cmd->srq_type = init_attr->srq_type;
 191         cmd->nchunks = srq->npages;
 192         cmd->pd_handle = to_vpd(pd)->pd_handle;
 193         cmd->attrs.max_wr = init_attr->attr.max_wr;
 194         cmd->attrs.max_sge = init_attr->attr.max_sge;
 195         cmd->attrs.srq_limit = init_attr->attr.srq_limit;
 196         cmd->pdir_dma = srq->pdir.dir_dma;
 197
 198         ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_SRQ_RESP);
 199         if (ret < 0) {
 200                 dev_warn(&dev->pdev->dev,
 201                          "could not create shared receive queue, error: %d\n",
 202                          ret);
 203                 goto err_page_dir;
 204         }
 205
 206         srq->srq_handle = resp->srqn;
 207         spin_lock_irqsave(&dev->srq_tbl_lock, flags);
 208         dev->srq_tbl[srq->srq_handle % dev->dsr->caps.max_srq] = srq;
 209         spin_unlock_irqrestore(&dev->srq_tbl_lock, flags);
 210
 211         /* Copy udata back. */
 212         if (ib_copy_to_udata(udata, &srq->srq_handle, sizeof(__u32))) {
 213                 dev_warn(&dev->pdev->dev, "failed to copy back udata\n");
 214                 pvrdma_destroy_srq(&srq->ibsrq);
 215                 return ERR_PTR(-EINVAL);
 216         }
 217
 218         return &srq->ibsrq;
 219
 220 err_page_dir:
 221         pvrdma_page_dir_cleanup(dev, &srq->pdir);
 222 err_umem:
 223         ib_umem_release(srq->umem);
 224 err_srq:
 225         kfree(srq);
 226         atomic_dec(&dev->num_srqs);
 227
 228         return ERR_PTR(ret);
 229 }
 230
 231 static void pvrdma_free_srq(struct pvrdma_dev *dev, struct pvrdma_srq *srq)
 232 {
 233         unsigned long flags;
 234
 235         spin_lock_irqsave(&dev->srq_tbl_lock, flags);
 236         dev->srq_tbl[srq->srq_handle] = NULL;
 237         spin_unlock_irqrestore(&dev->srq_tbl_lock, flags);
 238
 239         if (refcount_dec_and_test(&srq->refcnt))
 240                 complete(&srq->free);
 241         wait_for_completion(&srq->free);
 242
 243         /* There is no support for kernel clients, so this is safe. */
 244         ib_umem_release(srq->umem);
 245
 246         pvrdma_page_dir_cleanup(dev, &srq->pdir);
 247
 248         kfree(srq);
 249
 250         atomic_dec(&dev->num_srqs);
 251 }
 252
 253 /**
 254  * pvrdma_destroy_srq - destroy shared receive queue
 255  * @srq: the shared receive queue to destroy
 256  *
 257  * @return: 0 for success.
 258  */
 259 int pvrdma_destroy_srq(struct ib_srq *srq)
 260 {
 261         struct pvrdma_srq *vsrq = to_vsrq(srq);
 262         union pvrdma_cmd_req req;
 263         struct pvrdma_cmd_destroy_srq *cmd = &req.destroy_srq;
 264         struct pvrdma_dev *dev = to_vdev(srq->device);
 265         int ret;
 266
 267         memset(cmd, 0, sizeof(*cmd));
 268         cmd->hdr.cmd = PVRDMA_CMD_DESTROY_SRQ;
 269         cmd->srq_handle = vsrq->srq_handle;
 270
 271         ret = pvrdma_cmd_post(dev, &req, NULL, 0);
 272         if (ret < 0)
 273                 dev_warn(&dev->pdev->dev,
 274                          "destroy shared receive queue failed, error: %d\n",
 275                          ret);
 276
 277         pvrdma_free_srq(dev, vsrq);
 278
 279         return 0;
 280 }
 281
 282 /**
 283  * pvrdma_modify_srq - modify shared receive queue attributes
 284  * @ibsrq: the shared receive queue to modify
 285  * @attr: the shared receive queue's new attributes
 286  * @attr_mask: attributes mask
 287  * @udata: user data
 288  *
 289  * @returns 0 on success, otherwise returns an errno.
 290  */
 291 int pvrdma_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 292                       enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 293 {
 294         struct pvrdma_srq *vsrq = to_vsrq(ibsrq);
 295         union pvrdma_cmd_req req;
 296         struct pvrdma_cmd_modify_srq *cmd = &req.modify_srq;
 297         struct pvrdma_dev *dev = to_vdev(ibsrq->device);
 298         int ret;
 299
 300         /* Only support SRQ limit. */
 301         if (!(attr_mask & IB_SRQ_LIMIT))
 302                 return -EINVAL;
 303
 304         memset(cmd, 0, sizeof(*cmd));
 305         cmd->hdr.cmd = PVRDMA_CMD_MODIFY_SRQ;
 306         cmd->srq_handle = vsrq->srq_handle;
 307         cmd->attrs.srq_limit = attr->srq_limit;
 308         cmd->attr_mask = attr_mask;
 309
 310         ret = pvrdma_cmd_post(dev, &req, NULL, 0);
 311         if (ret < 0) {
 312                 dev_warn(&dev->pdev->dev,
 313                          "could not modify shared receive queue, error: %d\n",
 314                          ret);
 315
 316                 return -EINVAL;
 317         }
 318
 319         return ret;
 320 }