174 lines
4.9 KiB
C
174 lines
4.9 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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* 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 << 0)
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#define XDP_COPY (1 << 1) /* Force copy-mode */
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#define XDP_ZEROCOPY (1 << 2) /* Force zero-copy mode */
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/* If this option is set, the driver might go sleep and in that case
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* the XDP_RING_NEED_WAKEUP flag in the fill and/or Tx rings will be
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* set. If it is set, the application need to explicitly wake up the
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* driver with a poll() (Rx and Tx) or sendto() (Tx only). If you are
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* running the driver and the application on the same core, you should
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* use this option so that the kernel will yield to the user space
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* application.
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*/
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#define XDP_USE_NEED_WAKEUP (1 << 3)
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/* By setting this option, userspace application indicates that it can
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* handle multiple descriptors per packet thus enabling AF_XDP to split
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* multi-buffer XDP frames into multiple Rx descriptors. Without this set
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* such frames will be dropped.
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*/
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#define XDP_USE_SG (1 << 4)
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/* Flags for xsk_umem_config flags */
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#define XDP_UMEM_UNALIGNED_CHUNK_FLAG (1 << 0)
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/* Force checksum calculation in software. Can be used for testing or
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* working around potential HW issues. This option causes performance
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* degradation and only works in XDP_COPY mode.
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*/
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#define XDP_UMEM_TX_SW_CSUM (1 << 1)
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/* Request to reserve tx_metadata_len bytes of per-chunk metadata.
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*/
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#define XDP_UMEM_TX_METADATA_LEN (1 << 2)
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struct sockaddr_xdp {
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__u16 sxdp_family;
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__u16 sxdp_flags;
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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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};
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/* XDP_RING flags */
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#define XDP_RING_NEED_WAKEUP (1 << 0)
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struct xdp_ring_offset {
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__u64 producer;
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__u64 consumer;
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__u64 desc;
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__u64 flags;
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};
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struct xdp_mmap_offsets {
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struct xdp_ring_offset rx;
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struct xdp_ring_offset tx;
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struct xdp_ring_offset fr; /* Fill */
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struct xdp_ring_offset cr; /* Completion */
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};
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/* XDP socket options */
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#define XDP_MMAP_OFFSETS 1
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#define XDP_RX_RING 2
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#define XDP_TX_RING 3
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#define XDP_UMEM_REG 4
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#define XDP_UMEM_FILL_RING 5
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#define XDP_UMEM_COMPLETION_RING 6
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#define XDP_STATISTICS 7
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#define XDP_OPTIONS 8
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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 chunk_size;
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__u32 headroom;
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__u32 flags;
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__u32 tx_metadata_len;
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};
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struct xdp_statistics {
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__u64 rx_dropped; /* Dropped for other reasons */
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__u64 rx_invalid_descs; /* Dropped due to invalid descriptor */
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__u64 tx_invalid_descs; /* Dropped due to invalid descriptor */
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__u64 rx_ring_full; /* Dropped due to rx ring being full */
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__u64 rx_fill_ring_empty_descs; /* Failed to retrieve item from fill ring */
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__u64 tx_ring_empty_descs; /* Failed to retrieve item from tx ring */
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};
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struct xdp_options {
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__u32 flags;
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};
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/* Flags for the flags field of struct xdp_options */
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#define XDP_OPTIONS_ZEROCOPY (1 << 0)
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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_PGOFF_TX_RING 0x80000000
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#define XDP_UMEM_PGOFF_FILL_RING 0x100000000ULL
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#define XDP_UMEM_PGOFF_COMPLETION_RING 0x180000000ULL
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/* Masks for unaligned chunks mode */
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#define XSK_UNALIGNED_BUF_OFFSET_SHIFT 48
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#define XSK_UNALIGNED_BUF_ADDR_MASK \
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((1ULL << XSK_UNALIGNED_BUF_OFFSET_SHIFT) - 1)
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/* Request transmit timestamp. Upon completion, put it into tx_timestamp
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* field of struct xsk_tx_metadata.
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*/
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#define XDP_TXMD_FLAGS_TIMESTAMP (1 << 0)
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/* Request transmit checksum offload. Checksum start position and offset
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* are communicated via csum_start and csum_offset fields of struct
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* xsk_tx_metadata.
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*/
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#define XDP_TXMD_FLAGS_CHECKSUM (1 << 1)
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/* AF_XDP offloads request. 'request' union member is consumed by the driver
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* when the packet is being transmitted. 'completion' union member is
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* filled by the driver when the transmit completion arrives.
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*/
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struct xsk_tx_metadata {
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__u64 flags;
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union {
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struct {
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/* XDP_TXMD_FLAGS_CHECKSUM */
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/* Offset from desc->addr where checksumming should start. */
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__u16 csum_start;
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/* Offset from csum_start where checksum should be stored. */
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__u16 csum_offset;
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} request;
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struct {
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/* XDP_TXMD_FLAGS_TIMESTAMP */
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__u64 tx_timestamp;
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} completion;
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};
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};
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/* Rx/Tx descriptor */
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struct xdp_desc {
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__u64 addr;
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__u32 len;
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__u32 options;
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};
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/* UMEM descriptor is __u64 */
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/* Flag indicating that the packet continues with the buffer pointed out by the
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* next frame in the ring. The end of the packet is signalled by setting this
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* bit to zero. For single buffer packets, every descriptor has 'options' set
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* to 0 and this maintains backward compatibility.
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*/
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#define XDP_PKT_CONTD (1 << 0)
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/* TX packet carries valid metadata. */
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#define XDP_TX_METADATA (1 << 1)
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#endif /* _LINUX_IF_XDP_H */
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