hw/vmw_pvrdma/pvrdma_srq.c

0001 /*
0002  * Copyright (c) 2016-2017 VMware, Inc.  All rights reserved.
0003  *
0004  * This program is free software; you can redistribute it and/or
0005  * modify it under the terms of EITHER the GNU General Public License
0006  * version 2 as published by the Free Software Foundation or the BSD
0007  * 2-Clause License. This program is distributed in the hope that it
0008  * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
0009  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
0010  * See the GNU General Public License version 2 for more details at
0011  * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
0012  *
0013  * You should have received a copy of the GNU General Public License
0014  * along with this program available in the file COPYING in the main
0015  * directory of this source tree.
0016  *
0017  * The BSD 2-Clause License
0018  *
0019  *     Redistribution and use in source and binary forms, with or
0020  *     without modification, are permitted provided that the following
0021  *     conditions are met:
0022  *
0023  *      - Redistributions of source code must retain the above
0024  *        copyright notice, this list of conditions and the following
0025  *        disclaimer.
0026  *
0027  *      - Redistributions in binary form must reproduce the above
0028  *        copyright notice, this list of conditions and the following
0029  *        disclaimer in the documentation and/or other materials
0030  *        provided with the distribution.
0031  *
0032  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
0033  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
0034  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
0035  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
0036  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
0037  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
0038  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
0039  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
0040  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
0041  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0042  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
0043  * OF THE POSSIBILITY OF SUCH DAMAGE.
0044  */
0045
0046 #include <asm/page.h>
0047 #include <linux/io.h>
0048 #include <linux/wait.h>
0049 #include <rdma/ib_addr.h>
0050 #include <rdma/ib_smi.h>
0051 #include <rdma/ib_user_verbs.h>
0052
0053 #include "pvrdma.h"
0054
0055 /**
0056  * pvrdma_query_srq - query shared receive queue
0057  * @ibsrq: the shared receive queue to query
0058  * @srq_attr: attributes to query and return to client
0059  *
0060  * @return: 0 for success, otherwise returns an errno.
0061  */
0062 int pvrdma_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
0063 {
0064     struct pvrdma_dev *dev = to_vdev(ibsrq->device);
0065     struct pvrdma_srq *srq = to_vsrq(ibsrq);
0066     union pvrdma_cmd_req req;
0067     union pvrdma_cmd_resp rsp;
0068     struct pvrdma_cmd_query_srq *cmd = &req.query_srq;
0069     struct pvrdma_cmd_query_srq_resp *resp = &rsp.query_srq_resp;
0070     int ret;
0071
0072     memset(cmd, 0, sizeof(*cmd));
0073     cmd->hdr.cmd = PVRDMA_CMD_QUERY_SRQ;
0074     cmd->srq_handle = srq->srq_handle;
0075
0076     ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_SRQ_RESP);
0077     if (ret < 0) {
0078         dev_warn(&dev->pdev->dev,
0079              "could not query shared receive queue, error: %d\n",
0080              ret);
0081         return -EINVAL;
0082     }
0083
0084     srq_attr->srq_limit = resp->attrs.srq_limit;
0085     srq_attr->max_wr = resp->attrs.max_wr;
0086     srq_attr->max_sge = resp->attrs.max_sge;
0087
0088     return 0;
0089 }
0090
0091 /**
0092  * pvrdma_create_srq - create shared receive queue
0093  * @ibsrq: the IB shared receive queue
0094  * @init_attr: shared receive queue attributes
0095  * @udata: user data
0096  *
0097  * @return: 0 on success, otherwise returns an errno.
0098  */
0099 int pvrdma_create_srq(struct ib_srq *ibsrq, struct ib_srq_init_attr *init_attr,
0100               struct ib_udata *udata)
0101 {
0102     struct pvrdma_srq *srq = to_vsrq(ibsrq);
0103     struct pvrdma_dev *dev = to_vdev(ibsrq->device);
0104     union pvrdma_cmd_req req;
0105     union pvrdma_cmd_resp rsp;
0106     struct pvrdma_cmd_create_srq *cmd = &req.create_srq;
0107     struct pvrdma_cmd_create_srq_resp *resp = &rsp.create_srq_resp;
0108     struct pvrdma_create_srq_resp srq_resp = {};
0109     struct pvrdma_create_srq ucmd;
0110     unsigned long flags;
0111     int ret;
0112
0113     if (!udata) {
0114         /* No support for kernel clients. */
0115         dev_warn(&dev->pdev->dev,
0116              "no shared receive queue support for kernel client\n");
0117         return -EOPNOTSUPP;
0118     }
0119
0120     if (init_attr->srq_type != IB_SRQT_BASIC) {
0121         dev_warn(&dev->pdev->dev,
0122              "shared receive queue type %d not supported\n",
0123              init_attr->srq_type);
0124         return -EOPNOTSUPP;
0125     }
0126
0127     if (init_attr->attr.max_wr  > dev->dsr->caps.max_srq_wr ||
0128         init_attr->attr.max_sge > dev->dsr->caps.max_srq_sge) {
0129         dev_warn(&dev->pdev->dev,
0130              "shared receive queue size invalid\n");
0131         return -EINVAL;
0132     }
0133
0134     if (!atomic_add_unless(&dev->num_srqs, 1, dev->dsr->caps.max_srq))
0135         return -ENOMEM;
0136
0137     spin_lock_init(&srq->lock);
0138     refcount_set(&srq->refcnt, 1);
0139     init_completion(&srq->free);
0140
0141     dev_dbg(&dev->pdev->dev,
0142         "create shared receive queue from user space\n");
0143
0144     if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
0145         ret = -EFAULT;
0146         goto err_srq;
0147     }
0148
0149     srq->umem = ib_umem_get(ibsrq->device, ucmd.buf_addr, ucmd.buf_size, 0);
0150     if (IS_ERR(srq->umem)) {
0151         ret = PTR_ERR(srq->umem);
0152         goto err_srq;
0153     }
0154
0155     srq->npages = ib_umem_num_dma_blocks(srq->umem, PAGE_SIZE);
0156
0157     if (srq->npages < 0 || srq->npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
0158         dev_warn(&dev->pdev->dev,
0159              "overflow pages in shared receive queue\n");
0160         ret = -EINVAL;
0161         goto err_umem;
0162     }
0163
0164     ret = pvrdma_page_dir_init(dev, &srq->pdir, srq->npages, false);
0165     if (ret) {
0166         dev_warn(&dev->pdev->dev,
0167              "could not allocate page directory\n");
0168         goto err_umem;
0169     }
0170
0171     pvrdma_page_dir_insert_umem(&srq->pdir, srq->umem, 0);
0172
0173     memset(cmd, 0, sizeof(*cmd));
0174     cmd->hdr.cmd = PVRDMA_CMD_CREATE_SRQ;
0175     cmd->srq_type = init_attr->srq_type;
0176     cmd->nchunks = srq->npages;
0177     cmd->pd_handle = to_vpd(ibsrq->pd)->pd_handle;
0178     cmd->attrs.max_wr = init_attr->attr.max_wr;
0179     cmd->attrs.max_sge = init_attr->attr.max_sge;
0180     cmd->attrs.srq_limit = init_attr->attr.srq_limit;
0181     cmd->pdir_dma = srq->pdir.dir_dma;
0182
0183     ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_SRQ_RESP);
0184     if (ret < 0) {
0185         dev_warn(&dev->pdev->dev,
0186              "could not create shared receive queue, error: %d\n",
0187              ret);
0188         goto err_page_dir;
0189     }
0190
0191     srq->srq_handle = resp->srqn;
0192     srq_resp.srqn = resp->srqn;
0193     spin_lock_irqsave(&dev->srq_tbl_lock, flags);
0194     dev->srq_tbl[srq->srq_handle % dev->dsr->caps.max_srq] = srq;
0195     spin_unlock_irqrestore(&dev->srq_tbl_lock, flags);
0196
0197     /* Copy udata back. */
0198     if (ib_copy_to_udata(udata, &srq_resp, sizeof(srq_resp))) {
0199         dev_warn(&dev->pdev->dev, "failed to copy back udata\n");
0200         pvrdma_destroy_srq(&srq->ibsrq, udata);
0201         return -EINVAL;
0202     }
0203
0204     return 0;
0205
0206 err_page_dir:
0207     pvrdma_page_dir_cleanup(dev, &srq->pdir);
0208 err_umem:
0209     ib_umem_release(srq->umem);
0210 err_srq:
0211     atomic_dec(&dev->num_srqs);
0212
0213     return ret;
0214 }
0215
0216 static void pvrdma_free_srq(struct pvrdma_dev *dev, struct pvrdma_srq *srq)
0217 {
0218     unsigned long flags;
0219
0220     spin_lock_irqsave(&dev->srq_tbl_lock, flags);
0221     dev->srq_tbl[srq->srq_handle] = NULL;
0222     spin_unlock_irqrestore(&dev->srq_tbl_lock, flags);
0223
0224     if (refcount_dec_and_test(&srq->refcnt))
0225         complete(&srq->free);
0226     wait_for_completion(&srq->free);
0227
0228     /* There is no support for kernel clients, so this is safe. */
0229     ib_umem_release(srq->umem);
0230
0231     pvrdma_page_dir_cleanup(dev, &srq->pdir);
0232
0233     atomic_dec(&dev->num_srqs);
0234 }
0235
0236 /**
0237  * pvrdma_destroy_srq - destroy shared receive queue
0238  * @srq: the shared receive queue to destroy
0239  * @udata: user data or null for kernel object
0240  *
0241  * @return: 0 for success.
0242  */
0243 int pvrdma_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
0244 {
0245     struct pvrdma_srq *vsrq = to_vsrq(srq);
0246     union pvrdma_cmd_req req;
0247     struct pvrdma_cmd_destroy_srq *cmd = &req.destroy_srq;
0248     struct pvrdma_dev *dev = to_vdev(srq->device);
0249     int ret;
0250
0251     memset(cmd, 0, sizeof(*cmd));
0252     cmd->hdr.cmd = PVRDMA_CMD_DESTROY_SRQ;
0253     cmd->srq_handle = vsrq->srq_handle;
0254
0255     ret = pvrdma_cmd_post(dev, &req, NULL, 0);
0256     if (ret < 0)
0257         dev_warn(&dev->pdev->dev,
0258              "destroy shared receive queue failed, error: %d\n",
0259              ret);
0260
0261     pvrdma_free_srq(dev, vsrq);
0262     return 0;
0263 }
0264
0265 /**
0266  * pvrdma_modify_srq - modify shared receive queue attributes
0267  * @ibsrq: the shared receive queue to modify
0268  * @attr: the shared receive queue's new attributes
0269  * @attr_mask: attributes mask
0270  * @udata: user data
0271  *
0272  * @returns 0 on success, otherwise returns an errno.
0273  */
0274 int pvrdma_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
0275               enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
0276 {
0277     struct pvrdma_srq *vsrq = to_vsrq(ibsrq);
0278     union pvrdma_cmd_req req;
0279     struct pvrdma_cmd_modify_srq *cmd = &req.modify_srq;
0280     struct pvrdma_dev *dev = to_vdev(ibsrq->device);
0281     int ret;
0282
0283     /* Only support SRQ limit. */
0284     if (!(attr_mask & IB_SRQ_LIMIT))
0285         return -EINVAL;
0286
0287     memset(cmd, 0, sizeof(*cmd));
0288     cmd->hdr.cmd = PVRDMA_CMD_MODIFY_SRQ;
0289     cmd->srq_handle = vsrq->srq_handle;
0290     cmd->attrs.srq_limit = attr->srq_limit;
0291     cmd->attr_mask = attr_mask;
0292
0293     ret = pvrdma_cmd_post(dev, &req, NULL, 0);
0294     if (ret < 0) {
0295         dev_warn(&dev->pdev->dev,
0296              "could not modify shared receive queue, error: %d\n",
0297              ret);
0298
0299         return -EINVAL;
0300     }
0301
0302     return ret;
0303 }