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- /*
- * Copyright (c) 2016-2017 VMware, Inc. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of EITHER the GNU General Public License
- * version 2 as published by the Free Software Foundation or the BSD
- * 2-Clause License. This program is distributed in the hope that it
- * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
- * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License version 2 for more details at
- * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program available in the file COPYING in the main
- * directory of this source tree.
- *
- * The BSD 2-Clause License
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above
- * copyright notice, this list of conditions and the following
- * disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials
- * provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- #include <asm/page.h>
- #include <linux/io.h>
- #include <linux/wait.h>
- #include <rdma/ib_addr.h>
- #include <rdma/ib_smi.h>
- #include <rdma/ib_user_verbs.h>
- #include "pvrdma.h"
- /**
- * pvrdma_query_srq - query shared receive queue
- * @ibsrq: the shared receive queue to query
- * @srq_attr: attributes to query and return to client
- *
- * @return: 0 for success, otherwise returns an errno.
- */
- int pvrdma_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
- {
- struct pvrdma_dev *dev = to_vdev(ibsrq->device);
- struct pvrdma_srq *srq = to_vsrq(ibsrq);
- union pvrdma_cmd_req req;
- union pvrdma_cmd_resp rsp;
- struct pvrdma_cmd_query_srq *cmd = &req.query_srq;
- struct pvrdma_cmd_query_srq_resp *resp = &rsp.query_srq_resp;
- int ret;
- memset(cmd, 0, sizeof(*cmd));
- cmd->hdr.cmd = PVRDMA_CMD_QUERY_SRQ;
- cmd->srq_handle = srq->srq_handle;
- ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_SRQ_RESP);
- if (ret < 0) {
- dev_warn(&dev->pdev->dev,
- "could not query shared receive queue, error: %d\n",
- ret);
- return -EINVAL;
- }
- srq_attr->srq_limit = resp->attrs.srq_limit;
- srq_attr->max_wr = resp->attrs.max_wr;
- srq_attr->max_sge = resp->attrs.max_sge;
- return 0;
- }
- /**
- * pvrdma_create_srq - create shared receive queue
- * @pd: protection domain
- * @init_attr: shared receive queue attributes
- * @udata: user data
- *
- * @return: the ib_srq pointer on success, otherwise returns an errno.
- */
- struct ib_srq *pvrdma_create_srq(struct ib_pd *pd,
- struct ib_srq_init_attr *init_attr,
- struct ib_udata *udata)
- {
- struct pvrdma_srq *srq = NULL;
- struct pvrdma_dev *dev = to_vdev(pd->device);
- union pvrdma_cmd_req req;
- union pvrdma_cmd_resp rsp;
- struct pvrdma_cmd_create_srq *cmd = &req.create_srq;
- struct pvrdma_cmd_create_srq_resp *resp = &rsp.create_srq_resp;
- struct pvrdma_create_srq_resp srq_resp = {0};
- struct pvrdma_create_srq ucmd;
- unsigned long flags;
- int ret;
- if (!(pd->uobject && udata)) {
- /* No support for kernel clients. */
- dev_warn(&dev->pdev->dev,
- "no shared receive queue support for kernel client\n");
- return ERR_PTR(-EOPNOTSUPP);
- }
- if (init_attr->srq_type != IB_SRQT_BASIC) {
- dev_warn(&dev->pdev->dev,
- "shared receive queue type %d not supported\n",
- init_attr->srq_type);
- return ERR_PTR(-EINVAL);
- }
- if (init_attr->attr.max_wr > dev->dsr->caps.max_srq_wr ||
- init_attr->attr.max_sge > dev->dsr->caps.max_srq_sge) {
- dev_warn(&dev->pdev->dev,
- "shared receive queue size invalid\n");
- return ERR_PTR(-EINVAL);
- }
- if (!atomic_add_unless(&dev->num_srqs, 1, dev->dsr->caps.max_srq))
- return ERR_PTR(-ENOMEM);
- srq = kmalloc(sizeof(*srq), GFP_KERNEL);
- if (!srq) {
- ret = -ENOMEM;
- goto err_srq;
- }
- spin_lock_init(&srq->lock);
- refcount_set(&srq->refcnt, 1);
- init_completion(&srq->free);
- dev_dbg(&dev->pdev->dev,
- "create shared receive queue from user space\n");
- if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
- ret = -EFAULT;
- goto err_srq;
- }
- srq->umem = ib_umem_get(pd->uobject->context,
- ucmd.buf_addr,
- ucmd.buf_size, 0, 0);
- if (IS_ERR(srq->umem)) {
- ret = PTR_ERR(srq->umem);
- goto err_srq;
- }
- srq->npages = ib_umem_page_count(srq->umem);
- if (srq->npages < 0 || srq->npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
- dev_warn(&dev->pdev->dev,
- "overflow pages in shared receive queue\n");
- ret = -EINVAL;
- goto err_umem;
- }
- ret = pvrdma_page_dir_init(dev, &srq->pdir, srq->npages, false);
- if (ret) {
- dev_warn(&dev->pdev->dev,
- "could not allocate page directory\n");
- goto err_umem;
- }
- pvrdma_page_dir_insert_umem(&srq->pdir, srq->umem, 0);
- memset(cmd, 0, sizeof(*cmd));
- cmd->hdr.cmd = PVRDMA_CMD_CREATE_SRQ;
- cmd->srq_type = init_attr->srq_type;
- cmd->nchunks = srq->npages;
- cmd->pd_handle = to_vpd(pd)->pd_handle;
- cmd->attrs.max_wr = init_attr->attr.max_wr;
- cmd->attrs.max_sge = init_attr->attr.max_sge;
- cmd->attrs.srq_limit = init_attr->attr.srq_limit;
- cmd->pdir_dma = srq->pdir.dir_dma;
- ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_SRQ_RESP);
- if (ret < 0) {
- dev_warn(&dev->pdev->dev,
- "could not create shared receive queue, error: %d\n",
- ret);
- goto err_page_dir;
- }
- srq->srq_handle = resp->srqn;
- srq_resp.srqn = resp->srqn;
- spin_lock_irqsave(&dev->srq_tbl_lock, flags);
- dev->srq_tbl[srq->srq_handle % dev->dsr->caps.max_srq] = srq;
- spin_unlock_irqrestore(&dev->srq_tbl_lock, flags);
- /* Copy udata back. */
- if (ib_copy_to_udata(udata, &srq_resp, sizeof(srq_resp))) {
- dev_warn(&dev->pdev->dev, "failed to copy back udata\n");
- pvrdma_destroy_srq(&srq->ibsrq);
- return ERR_PTR(-EINVAL);
- }
- return &srq->ibsrq;
- err_page_dir:
- pvrdma_page_dir_cleanup(dev, &srq->pdir);
- err_umem:
- ib_umem_release(srq->umem);
- err_srq:
- kfree(srq);
- atomic_dec(&dev->num_srqs);
- return ERR_PTR(ret);
- }
- static void pvrdma_free_srq(struct pvrdma_dev *dev, struct pvrdma_srq *srq)
- {
- unsigned long flags;
- spin_lock_irqsave(&dev->srq_tbl_lock, flags);
- dev->srq_tbl[srq->srq_handle] = NULL;
- spin_unlock_irqrestore(&dev->srq_tbl_lock, flags);
- if (refcount_dec_and_test(&srq->refcnt))
- complete(&srq->free);
- wait_for_completion(&srq->free);
- /* There is no support for kernel clients, so this is safe. */
- ib_umem_release(srq->umem);
- pvrdma_page_dir_cleanup(dev, &srq->pdir);
- kfree(srq);
- atomic_dec(&dev->num_srqs);
- }
- /**
- * pvrdma_destroy_srq - destroy shared receive queue
- * @srq: the shared receive queue to destroy
- *
- * @return: 0 for success.
- */
- int pvrdma_destroy_srq(struct ib_srq *srq)
- {
- struct pvrdma_srq *vsrq = to_vsrq(srq);
- union pvrdma_cmd_req req;
- struct pvrdma_cmd_destroy_srq *cmd = &req.destroy_srq;
- struct pvrdma_dev *dev = to_vdev(srq->device);
- int ret;
- memset(cmd, 0, sizeof(*cmd));
- cmd->hdr.cmd = PVRDMA_CMD_DESTROY_SRQ;
- cmd->srq_handle = vsrq->srq_handle;
- ret = pvrdma_cmd_post(dev, &req, NULL, 0);
- if (ret < 0)
- dev_warn(&dev->pdev->dev,
- "destroy shared receive queue failed, error: %d\n",
- ret);
- pvrdma_free_srq(dev, vsrq);
- return 0;
- }
- /**
- * pvrdma_modify_srq - modify shared receive queue attributes
- * @ibsrq: the shared receive queue to modify
- * @attr: the shared receive queue's new attributes
- * @attr_mask: attributes mask
- * @udata: user data
- *
- * @returns 0 on success, otherwise returns an errno.
- */
- int pvrdma_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
- enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
- {
- struct pvrdma_srq *vsrq = to_vsrq(ibsrq);
- union pvrdma_cmd_req req;
- struct pvrdma_cmd_modify_srq *cmd = &req.modify_srq;
- struct pvrdma_dev *dev = to_vdev(ibsrq->device);
- int ret;
- /* Only support SRQ limit. */
- if (!(attr_mask & IB_SRQ_LIMIT))
- return -EINVAL;
- memset(cmd, 0, sizeof(*cmd));
- cmd->hdr.cmd = PVRDMA_CMD_MODIFY_SRQ;
- cmd->srq_handle = vsrq->srq_handle;
- cmd->attrs.srq_limit = attr->srq_limit;
- cmd->attr_mask = attr_mask;
- ret = pvrdma_cmd_post(dev, &req, NULL, 0);
- if (ret < 0) {
- dev_warn(&dev->pdev->dev,
- "could not modify shared receive queue, error: %d\n",
- ret);
- return -EINVAL;
- }
- return ret;
- }
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