418 lines
11 KiB
C
418 lines
11 KiB
C
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/*
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* Copyright (c) 2012-2016 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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/**
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* pvrdma_req_notify_cq - request notification for a completion queue
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* @ibcq: the completion queue
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* @notify_flags: notification flags
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*
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* @return: 0 for success.
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*/
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int pvrdma_req_notify_cq(struct ib_cq *ibcq,
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enum ib_cq_notify_flags notify_flags)
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{
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struct pvrdma_dev *dev = to_vdev(ibcq->device);
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struct pvrdma_cq *cq = to_vcq(ibcq);
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u32 val = cq->cq_handle;
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unsigned long flags;
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int has_data = 0;
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val |= (notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
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PVRDMA_UAR_CQ_ARM_SOL : PVRDMA_UAR_CQ_ARM;
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spin_lock_irqsave(&cq->cq_lock, flags);
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pvrdma_write_uar_cq(dev, val);
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if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) {
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unsigned int head;
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has_data = pvrdma_idx_ring_has_data(&cq->ring_state->rx,
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cq->ibcq.cqe, &head);
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if (unlikely(has_data == PVRDMA_INVALID_IDX))
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dev_err(&dev->pdev->dev, "CQ ring state invalid\n");
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}
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spin_unlock_irqrestore(&cq->cq_lock, flags);
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return has_data;
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}
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/**
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* pvrdma_create_cq - create completion queue
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* @ibdev: the device
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* @attr: completion queue attributes
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* @context: user context
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* @udata: user data
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*
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* @return: ib_cq completion queue pointer on success,
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* otherwise returns negative errno.
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*/
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struct ib_cq *pvrdma_create_cq(struct ib_device *ibdev,
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const struct ib_cq_init_attr *attr,
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struct ib_ucontext *context,
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struct ib_udata *udata)
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{
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int entries = attr->cqe;
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struct pvrdma_dev *dev = to_vdev(ibdev);
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struct pvrdma_cq *cq;
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int ret;
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int npages;
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unsigned long flags;
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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_cq *cmd = &req.create_cq;
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struct pvrdma_cmd_create_cq_resp *resp = &rsp.create_cq_resp;
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struct pvrdma_create_cq_resp cq_resp = {0};
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struct pvrdma_create_cq ucmd;
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BUILD_BUG_ON(sizeof(struct pvrdma_cqe) != 64);
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entries = roundup_pow_of_two(entries);
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if (entries < 1 || entries > dev->dsr->caps.max_cqe)
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return ERR_PTR(-EINVAL);
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if (!atomic_add_unless(&dev->num_cqs, 1, dev->dsr->caps.max_cq))
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return ERR_PTR(-ENOMEM);
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cq = kzalloc(sizeof(*cq), GFP_KERNEL);
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if (!cq) {
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atomic_dec(&dev->num_cqs);
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return ERR_PTR(-ENOMEM);
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}
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cq->ibcq.cqe = entries;
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cq->is_kernel = !context;
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if (!cq->is_kernel) {
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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_cq;
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}
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cq->umem = ib_umem_get(context, ucmd.buf_addr, ucmd.buf_size,
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IB_ACCESS_LOCAL_WRITE, 1);
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if (IS_ERR(cq->umem)) {
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ret = PTR_ERR(cq->umem);
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goto err_cq;
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}
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npages = ib_umem_page_count(cq->umem);
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} else {
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/* One extra page for shared ring state */
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npages = 1 + (entries * sizeof(struct pvrdma_cqe) +
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PAGE_SIZE - 1) / PAGE_SIZE;
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/* Skip header page. */
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cq->offset = PAGE_SIZE;
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}
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if (npages < 0 || npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
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dev_warn(&dev->pdev->dev,
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"overflow pages in completion 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, &cq->pdir, npages, cq->is_kernel);
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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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/* Ring state is always the first page. Set in library for user cq. */
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if (cq->is_kernel)
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cq->ring_state = cq->pdir.pages[0];
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else
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pvrdma_page_dir_insert_umem(&cq->pdir, cq->umem, 0);
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refcount_set(&cq->refcnt, 1);
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init_completion(&cq->free);
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spin_lock_init(&cq->cq_lock);
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memset(cmd, 0, sizeof(*cmd));
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cmd->hdr.cmd = PVRDMA_CMD_CREATE_CQ;
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cmd->nchunks = npages;
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cmd->ctx_handle = (context) ?
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(u64)to_vucontext(context)->ctx_handle : 0;
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cmd->cqe = entries;
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cmd->pdir_dma = cq->pdir.dir_dma;
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ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_CQ_RESP);
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if (ret < 0) {
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dev_warn(&dev->pdev->dev,
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"could not create completion queue, error: %d\n", ret);
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goto err_page_dir;
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}
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cq->ibcq.cqe = resp->cqe;
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cq->cq_handle = resp->cq_handle;
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cq_resp.cqn = resp->cq_handle;
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spin_lock_irqsave(&dev->cq_tbl_lock, flags);
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dev->cq_tbl[cq->cq_handle % dev->dsr->caps.max_cq] = cq;
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spin_unlock_irqrestore(&dev->cq_tbl_lock, flags);
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if (!cq->is_kernel) {
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cq->uar = &(to_vucontext(context)->uar);
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/* Copy udata back. */
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if (ib_copy_to_udata(udata, &cq_resp, sizeof(cq_resp))) {
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dev_warn(&dev->pdev->dev,
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"failed to copy back udata\n");
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pvrdma_destroy_cq(&cq->ibcq);
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return ERR_PTR(-EINVAL);
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}
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}
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return &cq->ibcq;
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err_page_dir:
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pvrdma_page_dir_cleanup(dev, &cq->pdir);
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err_umem:
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if (!cq->is_kernel)
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ib_umem_release(cq->umem);
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err_cq:
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atomic_dec(&dev->num_cqs);
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kfree(cq);
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return ERR_PTR(ret);
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}
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static void pvrdma_free_cq(struct pvrdma_dev *dev, struct pvrdma_cq *cq)
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{
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if (refcount_dec_and_test(&cq->refcnt))
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complete(&cq->free);
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wait_for_completion(&cq->free);
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if (!cq->is_kernel)
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ib_umem_release(cq->umem);
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pvrdma_page_dir_cleanup(dev, &cq->pdir);
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kfree(cq);
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}
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/**
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* pvrdma_destroy_cq - destroy completion queue
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* @cq: the completion 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_cq(struct ib_cq *cq)
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{
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struct pvrdma_cq *vcq = to_vcq(cq);
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union pvrdma_cmd_req req;
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struct pvrdma_cmd_destroy_cq *cmd = &req.destroy_cq;
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struct pvrdma_dev *dev = to_vdev(cq->device);
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unsigned long flags;
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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_CQ;
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cmd->cq_handle = vcq->cq_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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"could not destroy completion queue, error: %d\n",
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ret);
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/* free cq's resources */
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spin_lock_irqsave(&dev->cq_tbl_lock, flags);
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dev->cq_tbl[vcq->cq_handle] = NULL;
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spin_unlock_irqrestore(&dev->cq_tbl_lock, flags);
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pvrdma_free_cq(dev, vcq);
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atomic_dec(&dev->num_cqs);
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return ret;
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}
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static inline struct pvrdma_cqe *get_cqe(struct pvrdma_cq *cq, int i)
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{
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return (struct pvrdma_cqe *)pvrdma_page_dir_get_ptr(
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&cq->pdir,
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cq->offset +
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sizeof(struct pvrdma_cqe) * i);
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}
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void _pvrdma_flush_cqe(struct pvrdma_qp *qp, struct pvrdma_cq *cq)
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{
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unsigned int head;
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int has_data;
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if (!cq->is_kernel)
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return;
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/* Lock held */
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has_data = pvrdma_idx_ring_has_data(&cq->ring_state->rx,
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cq->ibcq.cqe, &head);
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if (unlikely(has_data > 0)) {
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int items;
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int curr;
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int tail = pvrdma_idx(&cq->ring_state->rx.prod_tail,
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cq->ibcq.cqe);
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struct pvrdma_cqe *cqe;
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struct pvrdma_cqe *curr_cqe;
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items = (tail > head) ? (tail - head) :
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(cq->ibcq.cqe - head + tail);
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curr = --tail;
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while (items-- > 0) {
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if (curr < 0)
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curr = cq->ibcq.cqe - 1;
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if (tail < 0)
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tail = cq->ibcq.cqe - 1;
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curr_cqe = get_cqe(cq, curr);
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if ((curr_cqe->qp & 0xFFFF) != qp->qp_handle) {
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if (curr != tail) {
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cqe = get_cqe(cq, tail);
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*cqe = *curr_cqe;
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}
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tail--;
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} else {
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pvrdma_idx_ring_inc(
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&cq->ring_state->rx.cons_head,
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cq->ibcq.cqe);
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}
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curr--;
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}
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}
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}
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static int pvrdma_poll_one(struct pvrdma_cq *cq, struct pvrdma_qp **cur_qp,
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struct ib_wc *wc)
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{
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struct pvrdma_dev *dev = to_vdev(cq->ibcq.device);
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int has_data;
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unsigned int head;
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bool tried = false;
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struct pvrdma_cqe *cqe;
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retry:
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has_data = pvrdma_idx_ring_has_data(&cq->ring_state->rx,
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cq->ibcq.cqe, &head);
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if (has_data == 0) {
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if (tried)
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return -EAGAIN;
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pvrdma_write_uar_cq(dev, cq->cq_handle | PVRDMA_UAR_CQ_POLL);
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tried = true;
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goto retry;
|
||
|
|
} else if (has_data == PVRDMA_INVALID_IDX) {
|
||
|
|
dev_err(&dev->pdev->dev, "CQ ring state invalid\n");
|
||
|
|
return -EAGAIN;
|
||
|
|
}
|
||
|
|
|
||
|
|
cqe = get_cqe(cq, head);
|
||
|
|
|
||
|
|
/* Ensure cqe is valid. */
|
||
|
|
rmb();
|
||
|
|
if (dev->qp_tbl[cqe->qp & 0xffff])
|
||
|
|
*cur_qp = (struct pvrdma_qp *)dev->qp_tbl[cqe->qp & 0xffff];
|
||
|
|
else
|
||
|
|
return -EAGAIN;
|
||
|
|
|
||
|
|
wc->opcode = pvrdma_wc_opcode_to_ib(cqe->opcode);
|
||
|
|
wc->status = pvrdma_wc_status_to_ib(cqe->status);
|
||
|
|
wc->wr_id = cqe->wr_id;
|
||
|
|
wc->qp = &(*cur_qp)->ibqp;
|
||
|
|
wc->byte_len = cqe->byte_len;
|
||
|
|
wc->ex.imm_data = cqe->imm_data;
|
||
|
|
wc->src_qp = cqe->src_qp;
|
||
|
|
wc->wc_flags = pvrdma_wc_flags_to_ib(cqe->wc_flags);
|
||
|
|
wc->pkey_index = cqe->pkey_index;
|
||
|
|
wc->slid = cqe->slid;
|
||
|
|
wc->sl = cqe->sl;
|
||
|
|
wc->dlid_path_bits = cqe->dlid_path_bits;
|
||
|
|
wc->port_num = cqe->port_num;
|
||
|
|
wc->vendor_err = cqe->vendor_err;
|
||
|
|
wc->network_hdr_type = cqe->network_hdr_type;
|
||
|
|
|
||
|
|
/* Update shared ring state */
|
||
|
|
pvrdma_idx_ring_inc(&cq->ring_state->rx.cons_head, cq->ibcq.cqe);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* pvrdma_poll_cq - poll for work completion queue entries
|
||
|
|
* @ibcq: completion queue
|
||
|
|
* @num_entries: the maximum number of entries
|
||
|
|
* @entry: pointer to work completion array
|
||
|
|
*
|
||
|
|
* @return: number of polled completion entries
|
||
|
|
*/
|
||
|
|
int pvrdma_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
|
||
|
|
{
|
||
|
|
struct pvrdma_cq *cq = to_vcq(ibcq);
|
||
|
|
struct pvrdma_qp *cur_qp = NULL;
|
||
|
|
unsigned long flags;
|
||
|
|
int npolled;
|
||
|
|
|
||
|
|
if (num_entries < 1 || wc == NULL)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&cq->cq_lock, flags);
|
||
|
|
for (npolled = 0; npolled < num_entries; ++npolled) {
|
||
|
|
if (pvrdma_poll_one(cq, &cur_qp, wc + npolled))
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
spin_unlock_irqrestore(&cq->cq_lock, flags);
|
||
|
|
|
||
|
|
/* Ensure we do not return errors from poll_cq */
|
||
|
|
return npolled;
|
||
|
|
}
|