1 files changed, 319 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/vmw_pvrdma/pvrdma_srq.c b/drivers/infiniband/hw/vmw_pvrdma/pvrdma_srq.c
new file mode 100644
index 000000000000..826ccb864596
--- /dev/null
+++ b/drivers/infiniband/hw/vmw_pvrdma/pvrdma_srq.c
@@ -0,0 +1,319 @@
+/*
+ * 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"
+
+int pvrdma_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
+			 struct ib_recv_wr **bad_wr)
+{
+	/* No support for kernel clients. */
+	return -EOPNOTSUPP;
+}
+
+/**
+ * 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 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_waitqueue_head(&srq->wait);
+
+	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;
+	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->srq_handle, sizeof(__u32))) {
+		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);
+
+	refcount_dec(&srq->refcnt);
+	wait_event(srq->wait, !refcount_read(&srq->refcnt));
+
+	/* 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;
+}