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xsk: add user memory registration support sockopt

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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>
This commit is contained in:
Björn Töpel
2018-05-02 13:01:23 +02:00
committed by Alexei Starovoitov
parent 68e8b849b2
commit c0c77d8fb7
8 changed files with 596 additions and 0 deletions
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45
net/xdp/xdp_umem.h Normal file
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/* SPDX-License-Identifier: GPL-2.0
* XDP user-space packet buffer
* Copyright(c) 2018 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 for
* more details.
*/
#ifndef XDP_UMEM_H_
#define XDP_UMEM_H_
#include <linux/mm.h>
#include <linux/if_xdp.h>
#include <linux/workqueue.h>
#include "xdp_umem_props.h"
struct xdp_umem {
struct page **pgs;
struct xdp_umem_props props;
u32 npgs;
u32 frame_headroom;
u32 nfpp_mask;
u32 nfpplog2;
u32 frame_size_log2;
struct user_struct *user;
struct pid *pid;
unsigned long address;
size_t size;
atomic_t users;
struct work_struct work;
};
int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr);
void xdp_get_umem(struct xdp_umem *umem);
void xdp_put_umem(struct xdp_umem *umem);
int xdp_umem_create(struct xdp_umem **umem);
#endif /* XDP_UMEM_H_ */