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35578d7984
According to the perf_event_map_fd and index, the function bpf_perf_event_read() can convert the corresponding map value to the pointer to struct perf_event and return the Hardware PMU counter value. Signed-off-by: Kaixu Xia <xiakaixu@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
304 lines
8.5 KiB
C
304 lines
8.5 KiB
C
/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#ifndef _UAPI__LINUX_BPF_H__
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#define _UAPI__LINUX_BPF_H__
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#include <linux/types.h>
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#include <linux/bpf_common.h>
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/* Extended instruction set based on top of classic BPF */
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/* instruction classes */
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#define BPF_ALU64 0x07 /* alu mode in double word width */
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/* ld/ldx fields */
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#define BPF_DW 0x18 /* double word */
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#define BPF_XADD 0xc0 /* exclusive add */
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/* alu/jmp fields */
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#define BPF_MOV 0xb0 /* mov reg to reg */
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#define BPF_ARSH 0xc0 /* sign extending arithmetic shift right */
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/* change endianness of a register */
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#define BPF_END 0xd0 /* flags for endianness conversion: */
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#define BPF_TO_LE 0x00 /* convert to little-endian */
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#define BPF_TO_BE 0x08 /* convert to big-endian */
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#define BPF_FROM_LE BPF_TO_LE
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#define BPF_FROM_BE BPF_TO_BE
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#define BPF_JNE 0x50 /* jump != */
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#define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */
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#define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */
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#define BPF_CALL 0x80 /* function call */
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#define BPF_EXIT 0x90 /* function return */
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/* Register numbers */
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enum {
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BPF_REG_0 = 0,
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BPF_REG_1,
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BPF_REG_2,
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BPF_REG_3,
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BPF_REG_4,
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BPF_REG_5,
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BPF_REG_6,
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BPF_REG_7,
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BPF_REG_8,
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BPF_REG_9,
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BPF_REG_10,
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__MAX_BPF_REG,
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};
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/* BPF has 10 general purpose 64-bit registers and stack frame. */
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#define MAX_BPF_REG __MAX_BPF_REG
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struct bpf_insn {
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__u8 code; /* opcode */
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__u8 dst_reg:4; /* dest register */
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__u8 src_reg:4; /* source register */
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__s16 off; /* signed offset */
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__s32 imm; /* signed immediate constant */
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};
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/* BPF syscall commands */
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enum bpf_cmd {
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/* create a map with given type and attributes
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* fd = bpf(BPF_MAP_CREATE, union bpf_attr *, u32 size)
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* returns fd or negative error
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* map is deleted when fd is closed
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*/
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BPF_MAP_CREATE,
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/* lookup key in a given map
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* err = bpf(BPF_MAP_LOOKUP_ELEM, union bpf_attr *attr, u32 size)
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* Using attr->map_fd, attr->key, attr->value
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* returns zero and stores found elem into value
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* or negative error
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*/
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BPF_MAP_LOOKUP_ELEM,
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/* create or update key/value pair in a given map
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* err = bpf(BPF_MAP_UPDATE_ELEM, union bpf_attr *attr, u32 size)
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* Using attr->map_fd, attr->key, attr->value, attr->flags
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* returns zero or negative error
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*/
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BPF_MAP_UPDATE_ELEM,
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/* find and delete elem by key in a given map
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* err = bpf(BPF_MAP_DELETE_ELEM, union bpf_attr *attr, u32 size)
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* Using attr->map_fd, attr->key
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* returns zero or negative error
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*/
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BPF_MAP_DELETE_ELEM,
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/* lookup key in a given map and return next key
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* err = bpf(BPF_MAP_GET_NEXT_KEY, union bpf_attr *attr, u32 size)
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* Using attr->map_fd, attr->key, attr->next_key
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* returns zero and stores next key or negative error
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*/
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BPF_MAP_GET_NEXT_KEY,
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/* verify and load eBPF program
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* prog_fd = bpf(BPF_PROG_LOAD, union bpf_attr *attr, u32 size)
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* Using attr->prog_type, attr->insns, attr->license
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* returns fd or negative error
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*/
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BPF_PROG_LOAD,
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};
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enum bpf_map_type {
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BPF_MAP_TYPE_UNSPEC,
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BPF_MAP_TYPE_HASH,
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BPF_MAP_TYPE_ARRAY,
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BPF_MAP_TYPE_PROG_ARRAY,
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BPF_MAP_TYPE_PERF_EVENT_ARRAY,
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};
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enum bpf_prog_type {
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BPF_PROG_TYPE_UNSPEC,
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BPF_PROG_TYPE_SOCKET_FILTER,
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BPF_PROG_TYPE_KPROBE,
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BPF_PROG_TYPE_SCHED_CLS,
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BPF_PROG_TYPE_SCHED_ACT,
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};
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#define BPF_PSEUDO_MAP_FD 1
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/* flags for BPF_MAP_UPDATE_ELEM command */
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#define BPF_ANY 0 /* create new element or update existing */
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#define BPF_NOEXIST 1 /* create new element if it didn't exist */
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#define BPF_EXIST 2 /* update existing element */
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union bpf_attr {
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struct { /* anonymous struct used by BPF_MAP_CREATE command */
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__u32 map_type; /* one of enum bpf_map_type */
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__u32 key_size; /* size of key in bytes */
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__u32 value_size; /* size of value in bytes */
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__u32 max_entries; /* max number of entries in a map */
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};
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struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
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__u32 map_fd;
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__aligned_u64 key;
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union {
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__aligned_u64 value;
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__aligned_u64 next_key;
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};
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__u64 flags;
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};
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struct { /* anonymous struct used by BPF_PROG_LOAD command */
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__u32 prog_type; /* one of enum bpf_prog_type */
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__u32 insn_cnt;
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__aligned_u64 insns;
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__aligned_u64 license;
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__u32 log_level; /* verbosity level of verifier */
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__u32 log_size; /* size of user buffer */
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__aligned_u64 log_buf; /* user supplied buffer */
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__u32 kern_version; /* checked when prog_type=kprobe */
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};
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} __attribute__((aligned(8)));
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/* integer value in 'imm' field of BPF_CALL instruction selects which helper
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* function eBPF program intends to call
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*/
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enum bpf_func_id {
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BPF_FUNC_unspec,
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BPF_FUNC_map_lookup_elem, /* void *map_lookup_elem(&map, &key) */
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BPF_FUNC_map_update_elem, /* int map_update_elem(&map, &key, &value, flags) */
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BPF_FUNC_map_delete_elem, /* int map_delete_elem(&map, &key) */
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BPF_FUNC_probe_read, /* int bpf_probe_read(void *dst, int size, void *src) */
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BPF_FUNC_ktime_get_ns, /* u64 bpf_ktime_get_ns(void) */
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BPF_FUNC_trace_printk, /* int bpf_trace_printk(const char *fmt, int fmt_size, ...) */
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BPF_FUNC_get_prandom_u32, /* u32 prandom_u32(void) */
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BPF_FUNC_get_smp_processor_id, /* u32 raw_smp_processor_id(void) */
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/**
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* skb_store_bytes(skb, offset, from, len, flags) - store bytes into packet
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* @skb: pointer to skb
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* @offset: offset within packet from skb->mac_header
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* @from: pointer where to copy bytes from
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* @len: number of bytes to store into packet
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* @flags: bit 0 - if true, recompute skb->csum
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* other bits - reserved
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* Return: 0 on success
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*/
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BPF_FUNC_skb_store_bytes,
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/**
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* l3_csum_replace(skb, offset, from, to, flags) - recompute IP checksum
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* @skb: pointer to skb
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* @offset: offset within packet where IP checksum is located
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* @from: old value of header field
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* @to: new value of header field
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* @flags: bits 0-3 - size of header field
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* other bits - reserved
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* Return: 0 on success
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*/
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BPF_FUNC_l3_csum_replace,
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/**
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* l4_csum_replace(skb, offset, from, to, flags) - recompute TCP/UDP checksum
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* @skb: pointer to skb
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* @offset: offset within packet where TCP/UDP checksum is located
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* @from: old value of header field
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* @to: new value of header field
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* @flags: bits 0-3 - size of header field
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* bit 4 - is pseudo header
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* other bits - reserved
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* Return: 0 on success
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*/
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BPF_FUNC_l4_csum_replace,
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/**
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* bpf_tail_call(ctx, prog_array_map, index) - jump into another BPF program
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* @ctx: context pointer passed to next program
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* @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY
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* @index: index inside array that selects specific program to run
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* Return: 0 on success
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*/
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BPF_FUNC_tail_call,
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/**
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* bpf_clone_redirect(skb, ifindex, flags) - redirect to another netdev
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* @skb: pointer to skb
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* @ifindex: ifindex of the net device
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* @flags: bit 0 - if set, redirect to ingress instead of egress
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* other bits - reserved
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* Return: 0 on success
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*/
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BPF_FUNC_clone_redirect,
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/**
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* u64 bpf_get_current_pid_tgid(void)
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* Return: current->tgid << 32 | current->pid
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*/
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BPF_FUNC_get_current_pid_tgid,
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/**
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* u64 bpf_get_current_uid_gid(void)
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* Return: current_gid << 32 | current_uid
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*/
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BPF_FUNC_get_current_uid_gid,
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/**
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* bpf_get_current_comm(char *buf, int size_of_buf)
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* stores current->comm into buf
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* Return: 0 on success
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*/
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BPF_FUNC_get_current_comm,
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/**
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* bpf_get_cgroup_classid(skb) - retrieve a proc's classid
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* @skb: pointer to skb
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* Return: classid if != 0
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*/
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BPF_FUNC_get_cgroup_classid,
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BPF_FUNC_skb_vlan_push, /* bpf_skb_vlan_push(skb, vlan_proto, vlan_tci) */
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BPF_FUNC_skb_vlan_pop, /* bpf_skb_vlan_pop(skb) */
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/**
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* bpf_skb_[gs]et_tunnel_key(skb, key, size, flags)
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* retrieve or populate tunnel metadata
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* @skb: pointer to skb
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* @key: pointer to 'struct bpf_tunnel_key'
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* @size: size of 'struct bpf_tunnel_key'
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* @flags: room for future extensions
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* Retrun: 0 on success
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*/
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BPF_FUNC_skb_get_tunnel_key,
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BPF_FUNC_skb_set_tunnel_key,
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BPF_FUNC_perf_event_read, /* u64 bpf_perf_event_read(&map, index) */
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__BPF_FUNC_MAX_ID,
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};
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/* user accessible mirror of in-kernel sk_buff.
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* new fields can only be added to the end of this structure
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*/
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struct __sk_buff {
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__u32 len;
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__u32 pkt_type;
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__u32 mark;
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__u32 queue_mapping;
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__u32 protocol;
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__u32 vlan_present;
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__u32 vlan_tci;
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__u32 vlan_proto;
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__u32 priority;
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__u32 ingress_ifindex;
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__u32 ifindex;
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__u32 tc_index;
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__u32 cb[5];
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__u32 hash;
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};
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struct bpf_tunnel_key {
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__u32 tunnel_id;
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__u32 remote_ipv4;
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};
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#endif /* _UAPI__LINUX_BPF_H__ */
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