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9fd63d05f3
The current bpf_map_def is statically defined during compile time. This patch allows the *_user.c program to change it during runtime. It is done by adding load_bpf_file_fixup_map() which takes a callback. The callback will be called before creating each map so that it has a chance to modify the bpf_map_def. The current usecase is to change max_entries in map_perf_test. It is interesting to test with a much bigger map size in some cases (e.g. the following patch on bpf_lru_map.c). However, it is hard to find one size to fit all testing environment. Hence, it is handy to take the max_entries as a cmdline arg and then configure the bpf_map_def during runtime. This patch adds two cmdline args. One is to configure the map's max_entries. Another is to configure the max_cnt which controls how many times a syscall is called. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
#ifndef __BPF_LOAD_H
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#define __BPF_LOAD_H
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#include "libbpf.h"
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#define MAX_MAPS 32
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#define MAX_PROGS 32
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struct bpf_map_def {
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unsigned int type;
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unsigned int key_size;
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unsigned int value_size;
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unsigned int max_entries;
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unsigned int map_flags;
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unsigned int inner_map_idx;
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};
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typedef void (*fixup_map_cb)(struct bpf_map_def *map, const char *map_name,
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int idx);
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extern int map_fd[MAX_MAPS];
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extern int prog_fd[MAX_PROGS];
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extern int event_fd[MAX_PROGS];
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extern char bpf_log_buf[BPF_LOG_BUF_SIZE];
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extern int prog_cnt;
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/* parses elf file compiled by llvm .c->.o
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* . parses 'maps' section and creates maps via BPF syscall
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* . parses 'license' section and passes it to syscall
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* . parses elf relocations for BPF maps and adjusts BPF_LD_IMM64 insns by
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* storing map_fd into insn->imm and marking such insns as BPF_PSEUDO_MAP_FD
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* . loads eBPF programs via BPF syscall
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*
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* One ELF file can contain multiple BPF programs which will be loaded
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* and their FDs stored stored in prog_fd array
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*
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* returns zero on success
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*/
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int load_bpf_file(char *path);
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int load_bpf_file_fixup_map(const char *path, fixup_map_cb fixup_map);
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void read_trace_pipe(void);
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struct ksym {
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long addr;
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char *name;
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};
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int load_kallsyms(void);
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struct ksym *ksym_search(long key);
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int set_link_xdp_fd(int ifindex, int fd);
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#endif
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