linux_dsm_epyc7002/include/uapi/linux/if_xdp.h
Magnus Karlsson 423f38329d xsk: add umem fill queue support and mmap
Here, we add another setsockopt for registered user memory (umem)
called XDP_UMEM_FILL_QUEUE. Using this socket option, the process can
ask the kernel to allocate a queue (ring buffer) and also mmap it
(XDP_UMEM_PGOFF_FILL_QUEUE) into the process.

The queue is used to explicitly pass ownership of umem frames from the
user process to the kernel. These frames will in a later patch be
filled in with Rx packet data by the kernel.

v2: Fixed potential crash in xsk_mmap.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-05-03 15:55:23 -07:00

50 lines
1.4 KiB
C

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
*
* if_xdp: XDP socket user-space interface
* 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.
*
* Author(s): Björn Töpel <bjorn.topel@intel.com>
* Magnus Karlsson <magnus.karlsson@intel.com>
*/
#ifndef _LINUX_IF_XDP_H
#define _LINUX_IF_XDP_H
#include <linux/types.h>
/* XDP socket options */
#define XDP_UMEM_REG 3
#define XDP_UMEM_FILL_RING 4
struct xdp_umem_reg {
__u64 addr; /* Start of packet data area */
__u64 len; /* Length of packet data area */
__u32 frame_size; /* Frame size */
__u32 frame_headroom; /* Frame head room */
};
/* Pgoff for mmaping the rings */
#define XDP_UMEM_PGOFF_FILL_RING 0x100000000
struct xdp_ring {
__u32 producer __attribute__((aligned(64)));
__u32 consumer __attribute__((aligned(64)));
};
/* Used for the fill and completion queues for buffers */
struct xdp_umem_ring {
struct xdp_ring ptrs;
__u32 desc[0] __attribute__((aligned(64)));
};
#endif /* _LINUX_IF_XDP_H */