/* * 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 (!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(udata, 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; }