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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c0c77d8fb7
In this commit the base structure of the AF_XDP address family is set
up. Further, we introduce the abilty register a window of user memory
to the kernel via the XDP_UMEM_REG setsockopt syscall. The memory
window is viewed by an AF_XDP socket as a set of equally large
frames. After a user memory registration all frames are "owned" by the
user application, and not the kernel.
v2: More robust checks on umem creation and unaccount on error.
Call set_page_dirty_lock on cleanup.
Simplified xdp_umem_reg.
Co-authored-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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* XDP user-space packet buffer
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* Copyright(c) 2018 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#ifndef XDP_UMEM_H_
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#define XDP_UMEM_H_
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#include <linux/mm.h>
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#include <linux/if_xdp.h>
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#include <linux/workqueue.h>
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#include "xdp_umem_props.h"
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struct xdp_umem {
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struct page **pgs;
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struct xdp_umem_props props;
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u32 npgs;
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u32 frame_headroom;
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u32 nfpp_mask;
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u32 nfpplog2;
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u32 frame_size_log2;
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struct user_struct *user;
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struct pid *pid;
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unsigned long address;
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size_t size;
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atomic_t users;
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struct work_struct work;
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};
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int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr);
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void xdp_get_umem(struct xdp_umem *umem);
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void xdp_put_umem(struct xdp_umem *umem);
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int xdp_umem_create(struct xdp_umem **umem);
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#endif /* XDP_UMEM_H_ */
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