4be93617fa
Remote DMA over Converged Ethernet, RoCE, for the ConnectX-4 series of PCI express network cards. There is currently no user-space support and this driver only supports kernel side non-routable RoCE V1. The krping kernel module can be used to test this driver. Full user-space support including RoCE V2 will be added as part of the ongoing upgrade to ibcore from Linux 4.9. Otherwise this driver is feature equivalent to mlx4ib(4). The mlx5ib(4) kernel module will only be built when WITH_OFED=YES is specified. MFC after: 2 weeks Sponsored by: Mellanox Technologies
94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/*-
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* Copyright (c) 2013-2015, Mellanox Technologies, Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <linux/kref.h>
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#include <linux/slab.h>
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#include <rdma/ib_umem.h>
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#include "mlx5_ib.h"
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struct mlx5_ib_user_db_page {
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struct list_head list;
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struct ib_umem *umem;
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uintptr_t user_virt;
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int refcnt;
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};
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int mlx5_ib_db_map_user(struct mlx5_ib_ucontext *context, uintptr_t virt,
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struct mlx5_db *db)
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{
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struct mlx5_ib_user_db_page *page;
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int err = 0;
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mutex_lock(&context->db_page_mutex);
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list_for_each_entry(page, &context->db_page_list, list)
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if (page->user_virt == (virt & PAGE_MASK))
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goto found;
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page = kmalloc(sizeof(*page), GFP_KERNEL);
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if (!page) {
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err = -ENOMEM;
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goto out;
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}
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page->user_virt = (virt & PAGE_MASK);
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page->refcnt = 0;
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page->umem = ib_umem_get(&context->ibucontext, virt & PAGE_MASK,
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PAGE_SIZE, 0, 0);
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if (IS_ERR(page->umem)) {
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err = PTR_ERR(page->umem);
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kfree(page);
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goto out;
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}
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list_add(&page->list, &context->db_page_list);
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found:
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db->dma = sg_dma_address(page->umem->sg_head.sgl) + (virt & ~PAGE_MASK);
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db->u.user_page = page;
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++page->refcnt;
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out:
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mutex_unlock(&context->db_page_mutex);
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return err;
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}
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void mlx5_ib_db_unmap_user(struct mlx5_ib_ucontext *context, struct mlx5_db *db)
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{
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mutex_lock(&context->db_page_mutex);
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if (!--db->u.user_page->refcnt) {
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list_del(&db->u.user_page->list);
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ib_umem_release(db->u.user_page->umem);
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kfree(db->u.user_page);
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}
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mutex_unlock(&context->db_page_mutex);
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}
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