tools/testing/selftests/bpf/netcnt_common.h

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/netcnt_common.h

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/netcnt_common.h
Extension
.h
Size
926 bytes
Lines
45
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#ifndef __NETCNT_COMMON_H
#define __NETCNT_COMMON_H

#include <linux/types.h>

#define MAX_PERCPU_PACKETS 32

/* sizeof(struct bpf_local_storage_elem):
 *
 * It is about 128 bytes on x86_64 and 512 bytes on s390x, but allocate more to
 * account for possible layout changes, different architectures, etc.
 * The kernel will wrap up to PAGE_SIZE internally anyway.
 */
#define SIZEOF_BPF_LOCAL_STORAGE_ELEM		768

/* Try to estimate kernel's BPF_LOCAL_STORAGE_MAX_VALUE_SIZE: */
#define BPF_LOCAL_STORAGE_MAX_VALUE_SIZE	(0xFFFF - \
						 SIZEOF_BPF_LOCAL_STORAGE_ELEM)

#define PCPU_MIN_UNIT_SIZE			32768

union percpu_net_cnt {
	struct {
		__u64 packets;
		__u64 bytes;

		__u64 prev_ts;

		__u64 prev_packets;
		__u64 prev_bytes;
	};
	__u8 data[PCPU_MIN_UNIT_SIZE];
};

union net_cnt {
	struct {
		__u64 packets;
		__u64 bytes;
	};
	__u8 data[BPF_LOCAL_STORAGE_MAX_VALUE_SIZE];
};

#endif

Annotation

Implementation Notes