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if_xdp.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* * if_xdp: XDP socket user-space interface * Copyright(c) 2018 Intel Corporation. * * 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> /* Options for the sxdp_flags field */ #define XDP_SHARED_UMEM (1 << 0) #define XDP_COPY (1 << 1) /* Force copy-mode */ #define XDP_ZEROCOPY (1 << 2) /* Force zero-copy mode */ /* If this option is set, the driver might go sleep and in that case * the XDP_RING_NEED_WAKEUP flag in the fill and/or Tx rings will be * set. If it is set, the application need to explicitly wake up the * driver with a poll() (Rx and Tx) or sendto() (Tx only). If you are * running the driver and the application on the same core, you should * use this option so that the kernel will yield to the user space * application. */ #define XDP_USE_NEED_WAKEUP (1 << 3) /* By setting this option, userspace application indicates that it can * handle multiple descriptors per packet thus enabling AF_XDP to split * multi-buffer XDP frames into multiple Rx descriptors. Without this set * such frames will be dropped. */ #define XDP_USE_SG (1 << 4) /* Flags for xsk_umem_config flags */ #define XDP_UMEM_UNALIGNED_CHUNK_FLAG (1 << 0) /* Force checksum calculation in software. Can be used for testing or * working around potential HW issues. This option causes performance * degradation and only works in XDP_COPY mode. */ #define XDP_UMEM_TX_SW_CSUM (1 << 1) /* Request to reserve tx_metadata_len bytes of per-chunk metadata. */ #define XDP_UMEM_TX_METADATA_LEN (1 << 2) struct sockaddr_xdp { __u16 sxdp_family; __u16 sxdp_flags; __u32 sxdp_ifindex; __u32 sxdp_queue_id; __u32 sxdp_shared_umem_fd; }; /* XDP_RING flags */ #define XDP_RING_NEED_WAKEUP (1 << 0) struct xdp_ring_offset { __u64 producer; __u64 consumer; __u64 desc; __u64 flags; }; struct xdp_mmap_offsets { struct xdp_ring_offset rx; struct xdp_ring_offset tx; struct xdp_ring_offset fr; /* Fill */ struct xdp_ring_offset cr; /* Completion */ }; /* XDP socket options */ #define XDP_MMAP_OFFSETS 1 #define XDP_RX_RING 2 #define XDP_TX_RING 3 #define XDP_UMEM_REG 4 #define XDP_UMEM_FILL_RING 5 #define XDP_UMEM_COMPLETION_RING 6 #define XDP_STATISTICS 7 #define XDP_OPTIONS 8 struct xdp_umem_reg { __u64 addr; /* Start of packet data area */ __u64 len; /* Length of packet data area */ __u32 chunk_size; __u32 headroom; __u32 flags; __u32 tx_metadata_len; }; struct xdp_statistics { __u64 rx_dropped; /* Dropped for other reasons */ __u64 rx_invalid_descs; /* Dropped due to invalid descriptor */ __u64 tx_invalid_descs; /* Dropped due to invalid descriptor */ __u64 rx_ring_full; /* Dropped due to rx ring being full */ __u64 rx_fill_ring_empty_descs; /* Failed to retrieve item from fill ring */ __u64 tx_ring_empty_descs; /* Failed to retrieve item from tx ring */ }; struct xdp_options { __u32 flags; }; /* Flags for the flags field of struct xdp_options */ #define XDP_OPTIONS_ZEROCOPY (1 << 0) /* Pgoff for mmaping the rings */ #define XDP_PGOFF_RX_RING 0 #define XDP_PGOFF_TX_RING 0x80000000 #define XDP_UMEM_PGOFF_FILL_RING 0x100000000ULL #define XDP_UMEM_PGOFF_COMPLETION_RING 0x180000000ULL /* Masks for unaligned chunks mode */ #define XSK_UNALIGNED_BUF_OFFSET_SHIFT 48 #define XSK_UNALIGNED_BUF_ADDR_MASK \ ((1ULL << XSK_UNALIGNED_BUF_OFFSET_SHIFT) - 1) /* Request transmit timestamp. Upon completion, put it into tx_timestamp * field of struct xsk_tx_metadata. */ #define XDP_TXMD_FLAGS_TIMESTAMP (1 << 0) /* Request transmit checksum offload. Checksum start position and offset * are communicated via csum_start and csum_offset fields of struct * xsk_tx_metadata. */ #define XDP_TXMD_FLAGS_CHECKSUM (1 << 1) /* AF_XDP offloads request. 'request' union member is consumed by the driver * when the packet is being transmitted. 'completion' union member is * filled by the driver when the transmit completion arrives. */ struct xsk_tx_metadata { __u64 flags; union { struct { /* XDP_TXMD_FLAGS_CHECKSUM */ /* Offset from desc->addr where checksumming should start. */ __u16 csum_start; /* Offset from csum_start where checksum should be stored. */ __u16 csum_offset; } request; struct { /* XDP_TXMD_FLAGS_TIMESTAMP */ __u64 tx_timestamp; } completion; }; }; /* Rx/Tx descriptor */ struct xdp_desc { __u64 addr; __u32 len; __u32 options; }; /* UMEM descriptor is __u64 */ /* Flag indicating that the packet continues with the buffer pointed out by the * next frame in the ring. The end of the packet is signalled by setting this * bit to zero. For single buffer packets, every descriptor has 'options' set * to 0 and this maintains backward compatibility. */ #define XDP_PKT_CONTD (1 << 0) /* TX packet carries valid metadata. */ #define XDP_TX_METADATA (1 << 1) #endif /* _LINUX_IF_XDP_H */
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