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@@ -0,0 +1,319 @@
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+/*
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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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+
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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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+
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+#include "pvrdma.h"
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+
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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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+/**
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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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+
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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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+
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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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+
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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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+
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+ return 0;
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+}
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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 ucmd;
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+ unsigned long flags;
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+ int ret;
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ spin_lock_init(&srq->lock);
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+ refcount_set(&srq->refcnt, 1);
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+ init_waitqueue_head(&srq->wait);
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+
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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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+
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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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+
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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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+
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+ srq->npages = ib_umem_page_count(srq->umem);
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+
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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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+
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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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+
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+ pvrdma_page_dir_insert_umem(&srq->pdir, srq->umem, 0);
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+
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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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+
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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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+
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+ srq->srq_handle = 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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+
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+ /* Copy udata back. */
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+ if (ib_copy_to_udata(udata, &srq->srq_handle, sizeof(__u32))) {
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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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+
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+ return &srq->ibsrq;
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+
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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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+
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+ return ERR_PTR(ret);
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+}
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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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+
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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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+
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+ refcount_dec(&srq->refcnt);
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+ wait_event(srq->wait, !refcount_read(&srq->refcnt));
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+
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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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+
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+ pvrdma_page_dir_cleanup(dev, &srq->pdir);
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+
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+ kfree(srq);
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+
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+ atomic_dec(&dev->num_srqs);
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+}
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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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+
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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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+
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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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+
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+ pvrdma_free_srq(dev, vsrq);
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+
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+ return 0;
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+}
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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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+
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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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+
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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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+
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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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+
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+ return -EINVAL;
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+ }
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+
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+ return ret;
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+}
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Bryan Tan