This patch adds the sock_diag interface for querying sockets from user space. Tools like iproute2 ss(8) can use this interface to list open AF_XDP sockets. The user-space ABI is defined in linux/xdp_diag.h and includes netlink request and response structs. The request can query sockets and the response contains socket information about the rings, umems, inode and more.
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| 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ | ||
| 2 | /* | ||
| 3 | * xdp_diag: interface for query/monitor XDP sockets | ||
| 4 | * Copyright(c) 2019 Intel Corporation. | ||
| 5 | */ | ||
| 6 | |||
| 7 | #ifndef _LINUX_XDP_DIAG_H | ||
| 8 | #define _LINUX_XDP_DIAG_H | ||
| 9 | |||
| 10 | #include <linux/types.h> | ||
| 11 | |||
| 12 | struct xdp_diag_req { | ||
| 13 | __u8 sdiag_family; | ||
| 14 | __u8 sdiag_protocol; | ||
| 15 | __u16 pad; | ||
| 16 | __u32 xdiag_ino; | ||
| 17 | __u32 xdiag_show; | ||
| 18 | __u32 xdiag_cookie[2]; | ||
| 19 | }; | ||
| 20 | |||
| 21 | struct xdp_diag_msg { | ||
| 22 | __u8 xdiag_family; | ||
| 23 | __u8 xdiag_type; | ||
| 24 | __u16 pad; | ||
| 25 | __u32 xdiag_ino; | ||
| 26 | __u32 xdiag_cookie[2]; | ||
| 27 | }; | ||
| 28 | |||
| 29 | #define XDP_SHOW_INFO (1 << 0) /* Basic information */ | ||
| 30 | #define XDP_SHOW_RING_CFG (1 << 1) | ||
| 31 | #define XDP_SHOW_UMEM (1 << 2) | ||
| 32 | #define XDP_SHOW_MEMINFO (1 << 3) | ||
| 33 | |||
| 34 | enum { | ||
| 35 | XDP_DIAG_NONE, | ||
| 36 | XDP_DIAG_INFO, | ||
| 37 | XDP_DIAG_UID, | ||
| 38 | XDP_DIAG_RX_RING, | ||
| 39 | XDP_DIAG_TX_RING, | ||
| 40 | XDP_DIAG_UMEM, | ||
| 41 | XDP_DIAG_UMEM_FILL_RING, | ||
| 42 | XDP_DIAG_UMEM_COMPLETION_RING, | ||
| 43 | XDP_DIAG_MEMINFO, | ||
| 44 | __XDP_DIAG_MAX, | ||
| 45 | }; | ||
| 46 | |||
| 47 | #define XDP_DIAG_MAX (__XDP_DIAG_MAX - 1) | ||
| 48 | |||
| 49 | struct xdp_diag_info { | ||
| 50 | __u32 ifindex; | ||
| 51 | __u32 queue_id; | ||
| 52 | }; | ||
| 53 | |||
| 54 | struct xdp_diag_ring { | ||
| 55 | __u32 entries; /*num descs */ | ||
| 56 | }; | ||
| 57 | |||
| 58 | #define XDP_DU_F_ZEROCOPY (1 << 0) | ||
| 59 | |||
| 60 | struct xdp_diag_umem { | ||
| 61 | __u64 size; | ||
| 62 | __u32 id; | ||
| 63 | __u32 num_pages; | ||
| 64 | __u32 chunk_size; | ||
| 65 | __u32 headroom; | ||
| 66 | __u32 ifindex; | ||
| 67 | __u32 queue_id; | ||
| 68 | __u32 flags; | ||
| 69 | __u32 refs; | ||
| 70 | }; | ||
| 71 | |||
| 72 | #endif /* _LINUX_XDP_DIAG_H */ | ||