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1f5a6c47aa
This ensures that we return the right structures back to userspace. Otherwise, it looks like the reserved fields in the response structures in userspace might have uninitialized data in them. Fixes:8b10ba783c
("RDMA/vmw_pvrdma: Add shared receive queue support") Fixes:29c8d9eba5
("IB: Add vmw_pvrdma driver") Suggested-by: Jason Gunthorpe <jgg@mellanox.com> Reviewed-by: Bryan Tan <bryantan@vmware.com> Reviewed-by: Aditya Sarwade <asarwade@vmware.com> Reviewed-by: Jorgen Hansen <jhansen@vmware.com> Signed-off-by: Adit Ranadive <aditr@vmware.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
323 lines
9.1 KiB
C
323 lines
9.1 KiB
C
/*
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* Copyright (c) 2016-2017 VMware, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of EITHER the GNU General Public License
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* version 2 as published by the Free Software Foundation or the BSD
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* 2-Clause License. This program is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License version 2 for more details at
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program available in the file COPYING in the main
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* directory of this source tree.
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*
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* The BSD 2-Clause License
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <asm/page.h>
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#include <linux/io.h>
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#include <linux/wait.h>
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#include <rdma/ib_addr.h>
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#include <rdma/ib_smi.h>
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#include <rdma/ib_user_verbs.h>
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#include "pvrdma.h"
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int pvrdma_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
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struct ib_recv_wr **bad_wr)
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{
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/* No support for kernel clients. */
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return -EOPNOTSUPP;
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}
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/**
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* pvrdma_query_srq - query shared receive queue
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* @ibsrq: the shared receive queue to query
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* @srq_attr: attributes to query and return to client
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*
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* @return: 0 for success, otherwise returns an errno.
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*/
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int pvrdma_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
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{
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struct pvrdma_dev *dev = to_vdev(ibsrq->device);
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struct pvrdma_srq *srq = to_vsrq(ibsrq);
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union pvrdma_cmd_req req;
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union pvrdma_cmd_resp rsp;
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struct pvrdma_cmd_query_srq *cmd = &req.query_srq;
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struct pvrdma_cmd_query_srq_resp *resp = &rsp.query_srq_resp;
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int ret;
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memset(cmd, 0, sizeof(*cmd));
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cmd->hdr.cmd = PVRDMA_CMD_QUERY_SRQ;
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cmd->srq_handle = srq->srq_handle;
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ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_SRQ_RESP);
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if (ret < 0) {
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dev_warn(&dev->pdev->dev,
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"could not query shared receive queue, error: %d\n",
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ret);
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return -EINVAL;
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}
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srq_attr->srq_limit = resp->attrs.srq_limit;
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srq_attr->max_wr = resp->attrs.max_wr;
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srq_attr->max_sge = resp->attrs.max_sge;
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return 0;
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}
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/**
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* pvrdma_create_srq - create shared receive queue
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* @pd: protection domain
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* @init_attr: shared receive queue attributes
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* @udata: user data
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*
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* @return: the ib_srq pointer on success, otherwise returns an errno.
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*/
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struct ib_srq *pvrdma_create_srq(struct ib_pd *pd,
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struct ib_srq_init_attr *init_attr,
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struct ib_udata *udata)
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{
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struct pvrdma_srq *srq = NULL;
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struct pvrdma_dev *dev = to_vdev(pd->device);
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union pvrdma_cmd_req req;
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union pvrdma_cmd_resp rsp;
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struct pvrdma_cmd_create_srq *cmd = &req.create_srq;
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struct pvrdma_cmd_create_srq_resp *resp = &rsp.create_srq_resp;
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struct pvrdma_create_srq_resp srq_resp = {0};
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struct pvrdma_create_srq ucmd;
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unsigned long flags;
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int ret;
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if (!(pd->uobject && udata)) {
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/* No support for kernel clients. */
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dev_warn(&dev->pdev->dev,
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"no shared receive queue support for kernel client\n");
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return ERR_PTR(-EOPNOTSUPP);
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}
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if (init_attr->srq_type != IB_SRQT_BASIC) {
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dev_warn(&dev->pdev->dev,
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"shared receive queue type %d not supported\n",
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init_attr->srq_type);
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return ERR_PTR(-EINVAL);
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}
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if (init_attr->attr.max_wr > dev->dsr->caps.max_srq_wr ||
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init_attr->attr.max_sge > dev->dsr->caps.max_srq_sge) {
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dev_warn(&dev->pdev->dev,
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"shared receive queue size invalid\n");
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return ERR_PTR(-EINVAL);
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}
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if (!atomic_add_unless(&dev->num_srqs, 1, dev->dsr->caps.max_srq))
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return ERR_PTR(-ENOMEM);
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srq = kmalloc(sizeof(*srq), GFP_KERNEL);
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if (!srq) {
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ret = -ENOMEM;
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goto err_srq;
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}
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spin_lock_init(&srq->lock);
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refcount_set(&srq->refcnt, 1);
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init_completion(&srq->free);
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dev_dbg(&dev->pdev->dev,
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"create shared receive queue from user space\n");
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if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
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ret = -EFAULT;
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goto err_srq;
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}
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srq->umem = ib_umem_get(pd->uobject->context,
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ucmd.buf_addr,
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ucmd.buf_size, 0, 0);
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if (IS_ERR(srq->umem)) {
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ret = PTR_ERR(srq->umem);
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goto err_srq;
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}
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srq->npages = ib_umem_page_count(srq->umem);
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if (srq->npages < 0 || srq->npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
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dev_warn(&dev->pdev->dev,
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"overflow pages in shared receive queue\n");
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ret = -EINVAL;
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goto err_umem;
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}
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ret = pvrdma_page_dir_init(dev, &srq->pdir, srq->npages, false);
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if (ret) {
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dev_warn(&dev->pdev->dev,
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"could not allocate page directory\n");
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goto err_umem;
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}
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pvrdma_page_dir_insert_umem(&srq->pdir, srq->umem, 0);
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memset(cmd, 0, sizeof(*cmd));
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cmd->hdr.cmd = PVRDMA_CMD_CREATE_SRQ;
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cmd->srq_type = init_attr->srq_type;
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cmd->nchunks = srq->npages;
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cmd->pd_handle = to_vpd(pd)->pd_handle;
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cmd->attrs.max_wr = init_attr->attr.max_wr;
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cmd->attrs.max_sge = init_attr->attr.max_sge;
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cmd->attrs.srq_limit = init_attr->attr.srq_limit;
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cmd->pdir_dma = srq->pdir.dir_dma;
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ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_SRQ_RESP);
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if (ret < 0) {
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dev_warn(&dev->pdev->dev,
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"could not create shared receive queue, error: %d\n",
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ret);
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goto err_page_dir;
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}
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srq->srq_handle = resp->srqn;
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srq_resp.srqn = resp->srqn;
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spin_lock_irqsave(&dev->srq_tbl_lock, flags);
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dev->srq_tbl[srq->srq_handle % dev->dsr->caps.max_srq] = srq;
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spin_unlock_irqrestore(&dev->srq_tbl_lock, flags);
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/* Copy udata back. */
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if (ib_copy_to_udata(udata, &srq_resp, sizeof(srq_resp))) {
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dev_warn(&dev->pdev->dev, "failed to copy back udata\n");
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pvrdma_destroy_srq(&srq->ibsrq);
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return ERR_PTR(-EINVAL);
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}
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return &srq->ibsrq;
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err_page_dir:
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pvrdma_page_dir_cleanup(dev, &srq->pdir);
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err_umem:
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ib_umem_release(srq->umem);
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err_srq:
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kfree(srq);
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atomic_dec(&dev->num_srqs);
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return ERR_PTR(ret);
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}
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static void pvrdma_free_srq(struct pvrdma_dev *dev, struct pvrdma_srq *srq)
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{
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unsigned long flags;
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spin_lock_irqsave(&dev->srq_tbl_lock, flags);
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dev->srq_tbl[srq->srq_handle] = NULL;
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spin_unlock_irqrestore(&dev->srq_tbl_lock, flags);
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if (refcount_dec_and_test(&srq->refcnt))
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complete(&srq->free);
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wait_for_completion(&srq->free);
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/* There is no support for kernel clients, so this is safe. */
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ib_umem_release(srq->umem);
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pvrdma_page_dir_cleanup(dev, &srq->pdir);
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kfree(srq);
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atomic_dec(&dev->num_srqs);
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}
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/**
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* pvrdma_destroy_srq - destroy shared receive queue
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* @srq: the shared receive queue to destroy
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*
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* @return: 0 for success.
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*/
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int pvrdma_destroy_srq(struct ib_srq *srq)
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{
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struct pvrdma_srq *vsrq = to_vsrq(srq);
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union pvrdma_cmd_req req;
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struct pvrdma_cmd_destroy_srq *cmd = &req.destroy_srq;
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struct pvrdma_dev *dev = to_vdev(srq->device);
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int ret;
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memset(cmd, 0, sizeof(*cmd));
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cmd->hdr.cmd = PVRDMA_CMD_DESTROY_SRQ;
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cmd->srq_handle = vsrq->srq_handle;
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ret = pvrdma_cmd_post(dev, &req, NULL, 0);
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if (ret < 0)
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dev_warn(&dev->pdev->dev,
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"destroy shared receive queue failed, error: %d\n",
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ret);
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pvrdma_free_srq(dev, vsrq);
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return 0;
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}
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/**
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* pvrdma_modify_srq - modify shared receive queue attributes
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* @ibsrq: the shared receive queue to modify
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* @attr: the shared receive queue's new attributes
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* @attr_mask: attributes mask
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* @udata: user data
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*
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* @returns 0 on success, otherwise returns an errno.
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*/
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int pvrdma_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
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enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
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{
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struct pvrdma_srq *vsrq = to_vsrq(ibsrq);
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union pvrdma_cmd_req req;
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struct pvrdma_cmd_modify_srq *cmd = &req.modify_srq;
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struct pvrdma_dev *dev = to_vdev(ibsrq->device);
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int ret;
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/* Only support SRQ limit. */
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if (!(attr_mask & IB_SRQ_LIMIT))
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return -EINVAL;
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memset(cmd, 0, sizeof(*cmd));
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cmd->hdr.cmd = PVRDMA_CMD_MODIFY_SRQ;
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cmd->srq_handle = vsrq->srq_handle;
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cmd->attrs.srq_limit = attr->srq_limit;
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cmd->attr_mask = attr_mask;
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ret = pvrdma_cmd_post(dev, &req, NULL, 0);
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if (ret < 0) {
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dev_warn(&dev->pdev->dev,
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"could not modify shared receive queue, error: %d\n",
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ret);
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return -EINVAL;
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}
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return ret;
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}
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