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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: 0 on success, otherwise returns an errno.
*/
int pvrdma_create_srq(struct ib_srq *ibsrq, struct ib_srq_init_attr *init_attr,
struct ib_udata *udata)
{
struct pvrdma_srq *srq = to_vsrq(ibsrq);
struct pvrdma_dev *dev = to_vdev(ibsrq->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 = {};
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 -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 -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 -EINVAL;
}
if (!atomic_add_unless(&dev->num_srqs, 1, dev->dsr->caps.max_srq))
return -ENOMEM;
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(ibsrq->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, udata);
return -EINVAL;
}
return 0;
err_page_dir:
pvrdma_page_dir_cleanup(dev, &srq->pdir);
err_umem:
ib_umem_release(srq->umem);
err_srq:
atomic_dec(&dev->num_srqs);
return 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);
atomic_dec(&dev->num_srqs);
}
/**
* pvrdma_destroy_srq - destroy shared receive queue
* @srq: the shared receive queue to destroy
* @udata: user data or null for kernel object
*
* @return: 0 for success.
*/
void pvrdma_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
{
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);
}
/**
* 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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