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| author | Martin KaFai Lau <kafai@fb.com> | 2017-04-14 20:30:28 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-04-17 20:55:52 +0300 |
| commit | 9fd63d05f3e8476282cd8c484eb34d3f6be54f40 (patch) | |
| tree | f3fb9ca5e7f8e8be6114a29ee23b17357522000d /samples/bpf/bpf_load.h | |
| parent | bf8db5d243a103ccd3f6d82a110e2302608e248c (diff) | |
| download | linux-9fd63d05f3e8476282cd8c484eb34d3f6be54f40.tar.xz | |
bpf: Allow bpf sample programs (*_user.c) to change bpf_map_def
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>
Diffstat (limited to 'samples/bpf/bpf_load.h')
| -rw-r--r-- | samples/bpf/bpf_load.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/samples/bpf/bpf_load.h b/samples/bpf/bpf_load.h index c827827299b3..68f6b2d22507 100644 --- a/samples/bpf/bpf_load.h +++ b/samples/bpf/bpf_load.h @@ -6,6 +6,18 @@ #define MAX_MAPS 32 #define MAX_PROGS 32 +struct bpf_map_def { + unsigned int type; + unsigned int key_size; + unsigned int value_size; + unsigned int max_entries; + unsigned int map_flags; + unsigned int inner_map_idx; +}; + +typedef void (*fixup_map_cb)(struct bpf_map_def *map, const char *map_name, + int idx); + extern int map_fd[MAX_MAPS]; extern int prog_fd[MAX_PROGS]; extern int event_fd[MAX_PROGS]; @@ -25,6 +37,7 @@ extern int prog_cnt; * returns zero on success */ int load_bpf_file(char *path); +int load_bpf_file_fixup_map(const char *path, fixup_map_cb fixup_map); void read_trace_pipe(void); struct ksym { |