965a990984
Here, the bind syscall is added. Binding an AF_XDP socket, means
associating the socket to an umem, a netdev and a queue index. This
can be done in two ways.
The first way, creating a "socket from scratch". Create the umem using
the XDP_UMEM_REG setsockopt and an associated fill queue with
XDP_UMEM_FILL_QUEUE. Create the Rx queue using the XDP_RX_QUEUE
setsockopt. Call bind passing ifindex and queue index ("channel" in
ethtool speak).
The second way to bind a socket, is simply skipping the
umem/netdev/queue index, and passing another already setup AF_XDP
socket. The new socket will then have the same umem/netdev/queue index
as the parent so it will share the same umem. You must also set the
flags field in the socket address to XDP_SHARED_UMEM.
v2: Use PTR_ERR instead of passing error variable explicitly.
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
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*
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* if_xdp: XDP socket user-space interface
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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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* Author(s): Björn Töpel <bjorn.topel@intel.com>
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* Magnus Karlsson <magnus.karlsson@intel.com>
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*/
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#ifndef _LINUX_IF_XDP_H
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#define _LINUX_IF_XDP_H
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#include <linux/types.h>
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/* Options for the sxdp_flags field */
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#define XDP_SHARED_UMEM 1
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struct sockaddr_xdp {
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__u16 sxdp_family;
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__u32 sxdp_ifindex;
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__u32 sxdp_queue_id;
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__u32 sxdp_shared_umem_fd;
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__u16 sxdp_flags;
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};
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/* XDP socket options */
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#define XDP_RX_RING 1
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#define XDP_UMEM_REG 3
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#define XDP_UMEM_FILL_RING 4
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struct xdp_umem_reg {
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__u64 addr; /* Start of packet data area */
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__u64 len; /* Length of packet data area */
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__u32 frame_size; /* Frame size */
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__u32 frame_headroom; /* Frame head room */
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};
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/* Pgoff for mmaping the rings */
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#define XDP_PGOFF_RX_RING 0
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#define XDP_UMEM_PGOFF_FILL_RING 0x100000000
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struct xdp_desc {
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__u32 idx;
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__u32 len;
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__u16 offset;
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__u8 flags;
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__u8 padding[5];
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};
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struct xdp_ring {
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__u32 producer __attribute__((aligned(64)));
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__u32 consumer __attribute__((aligned(64)));
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};
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/* Used for the RX and TX queues for packets */
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struct xdp_rxtx_ring {
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struct xdp_ring ptrs;
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struct xdp_desc desc[0] __attribute__((aligned(64)));
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};
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/* Used for the fill and completion queues for buffers */
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struct xdp_umem_ring {
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struct xdp_ring ptrs;
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__u32 desc[0] __attribute__((aligned(64)));
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};
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#endif /* _LINUX_IF_XDP_H */
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