Commit a36b38aa authored by Björn Töpel's avatar Björn Töpel Committed by Daniel Borkmann
Browse files

xsk: add sock_diag interface for AF_XDP 



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.

Signed-off-by: default avatarBjörn Töpel <bjorn.topel@intel.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent 50e74c01

include/uapi/linux/xdp_diag.h

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+72 −0
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

/*

 * xdp_diag: interface for query/monitor XDP sockets

 * Copyright(c) 2019 Intel Corporation.

 */



#ifndef _LINUX_XDP_DIAG_H

#define _LINUX_XDP_DIAG_H



#include <linux/types.h>



struct xdp_diag_req {

	__u8	sdiag_family;

	__u8	sdiag_protocol;

	__u16	pad;

	__u32	xdiag_ino;

	__u32	xdiag_show;

	__u32	xdiag_cookie[2];

};



struct xdp_diag_msg {

	__u8	xdiag_family;

	__u8	xdiag_type;

	__u16	pad;

	__u32	xdiag_ino;

	__u32	xdiag_cookie[2];

};



#define XDP_SHOW_INFO		(1 << 0) /* Basic information */

#define XDP_SHOW_RING_CFG	(1 << 1)

#define XDP_SHOW_UMEM		(1 << 2)

#define XDP_SHOW_MEMINFO	(1 << 3)



enum {

	XDP_DIAG_NONE,

	XDP_DIAG_INFO,

	XDP_DIAG_UID,

	XDP_DIAG_RX_RING,

	XDP_DIAG_TX_RING,

	XDP_DIAG_UMEM,

	XDP_DIAG_UMEM_FILL_RING,

	XDP_DIAG_UMEM_COMPLETION_RING,

	XDP_DIAG_MEMINFO,

	__XDP_DIAG_MAX,

};



#define XDP_DIAG_MAX (__XDP_DIAG_MAX - 1)



struct xdp_diag_info {

	__u32	ifindex;

	__u32	queue_id;

};



struct xdp_diag_ring {

	__u32	entries; /*num descs */

};



#define XDP_DU_F_ZEROCOPY (1 << 0)



struct xdp_diag_umem {

	__u64	size;

	__u32	id;

	__u32	num_pages;

	__u32	chunk_size;

	__u32	headroom;

	__u32	ifindex;

	__u32	queue_id;

	__u32	flags;

	__u32	refs;

};



#endif /* _LINUX_XDP_DIAG_H */

net/xdp/Kconfig

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@@ -5,3 +5,11 @@ config XDP_SOCKETS 
	help

	  XDP sockets allows a channel between XDP programs and

	  userspace applications.



config XDP_SOCKETS_DIAG

	tristate "XDP sockets: monitoring interface"

	depends on XDP_SOCKETS

	default n

	help

	  Support for PF_XDP sockets monitoring interface used by the ss tool.

	  If unsure, say Y.

net/xdp/Makefile

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obj-$(CONFIG_XDP_SOCKETS) += xsk.o xdp_umem.o xsk_queue.o

obj-$(CONFIG_XDP_SOCKETS_DIAG) += xsk_diag.o

net/xdp/xsk.c

+1 −5
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@@ -27,14 +27,10 @@ 


#include "xsk_queue.h"

#include "xdp_umem.h"

#include "xsk.h"



#define TX_BATCH_SIZE 16



static struct xdp_sock *xdp_sk(struct sock *sk)

{

	return (struct xdp_sock *)sk;

}



bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs)

{

	return READ_ONCE(xs->rx) &&  READ_ONCE(xs->umem) &&

net/xdp/xsk.h

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/* SPDX-License-Identifier: GPL-2.0 */

/* Copyright(c) 2019 Intel Corporation. */



#ifndef XSK_H_

#define XSK_H_



static inline struct xdp_sock *xdp_sk(struct sock *sk)

{

	return (struct xdp_sock *)sk;

}



#endif /* XSK_H_ */

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