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 */ | |