Messages in this thread Patch in this message | | | From | He Kuang <> | Subject | [RFC PATCH v2 18/26] perf bpf: Add ubpf helper function slots and set/get methods | Date | Sun, 26 Jun 2016 11:21:10 +0000 |
| |
Userspace bpf program has the ability to invoke helper functions provided externally, this patch stores the helper functions in array and adds methods for set/get functions in it. Theoretically the function index can be up to UINT32_MAX, here we simply use an array contains 64 function pointer slots.
Signed-off-by: Wang Nan <wangnan0@huawei.com> Signed-off-by: He Kuang <hekuang@huawei.com> --- tools/lib/bpf/engine-ubpf.c | 25 +++++++++++++++++++++++++ tools/lib/bpf/libbpf.h | 16 ++++++++++++++++ 2 files changed, 41 insertions(+)
diff --git a/tools/lib/bpf/engine-ubpf.c b/tools/lib/bpf/engine-ubpf.c index 9a0b425..e63a267 100644 --- a/tools/lib/bpf/engine-ubpf.c +++ b/tools/lib/bpf/engine-ubpf.c @@ -7,6 +7,31 @@ #include "bpf.h" #include "libbpf-internal.h" +static struct { + const char *name; + void *func; +} ubpf_funcs[MAX_UBPF_FUNC]; + +const void *libbpf_get_ubpf_func(unsigned int func_id) +{ + if (func_id >= MAX_UBPF_FUNC) + return NULL; + + return ubpf_funcs[func_id].func; +} + +int libbpf_set_ubpf_func(unsigned int idx, const char *name, void *func) +{ + if (idx >= MAX_UBPF_FUNC) + return -E2BIG; + if (!func) + return -EINVAL; + + ubpf_funcs[idx].name = name; + ubpf_funcs[idx].func = func; + return 0; +} + static int engine__init(struct bpf_program *prog) { struct ubpf_entry *instances_entries; diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index e01ab8e..19c92bd 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -188,6 +188,8 @@ int bpf_map__set_priv(struct bpf_map *map, void *priv, bpf_map_clear_priv_t clear_priv); void *bpf_map__priv(struct bpf_map *map); +#define MAX_UBPF_FUNC 64 + /* The entity of ubpf program */ struct ubpf_entry { struct bpf_insn *insns; @@ -196,6 +198,8 @@ struct ubpf_entry { #ifdef HAVE_UBPF_SUPPORT int bpf_program__set_ubpf(struct bpf_program *prog); bool bpf_program__is_ubpf(struct bpf_program *prog); +const void *libbpf_get_ubpf_func(unsigned int func_id); +int libbpf_set_ubpf_func(unsigned int idx, const char *name, void *func); #else static inline int bpf_program__set_ubpf(struct bpf_program *prog __maybe_unused) @@ -207,6 +211,18 @@ bpf_program__is_ubpf(struct bpf_program *prog __maybe_unused) { return false; } +static inline +const void *libbpf_get_ubpf_func(unsigned int func_id __maybe_unused) +{ + return NULL; +} +static inline int +libbpf_set_ubpf_func(unsigned int idx __maybe_unused, + const char *name __maybe_unused, + void *func __maybe_unused) +{ + return -LIBBPF_ERRNO__NOUBPF; +} #endif #endif -- 1.8.5.2
| |