diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index ac69ae3bd628..54b48de3df78 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -21,6 +21,7 @@ #include #include "libbpf.h" +#include "bpf.h" #define __printf(a, b) __attribute__((format(printf, a, b))) @@ -105,6 +106,13 @@ struct bpf_object { struct bpf_program *programs; size_t nr_programs; + int *map_fds; + /* + * This field is required because maps_buf will be freed and + * maps_buf_sz will be set to 0 after loaded. + */ + size_t nr_map_fds; + bool loaded; /* * Information when doing elf related work. Only valid if fd @@ -233,6 +241,7 @@ static struct bpf_object *bpf_object__new(const char *path, obj->efile.obj_buf = obj_buf; obj->efile.obj_buf_sz = obj_buf_sz; + obj->loaded = false; return obj; } @@ -565,6 +574,62 @@ bpf_program__collect_reloc(struct bpf_program *prog, return 0; } +static int +bpf_object__create_maps(struct bpf_object *obj) +{ + unsigned int i; + size_t nr_maps; + int *pfd; + + nr_maps = obj->maps_buf_sz / sizeof(struct bpf_map_def); + if (!obj->maps_buf || !nr_maps) { + pr_debug("don't need create maps for %s\n", + obj->path); + return 0; + } + + obj->map_fds = malloc(sizeof(int) * nr_maps); + if (!obj->map_fds) { + pr_warning("realloc perf_bpf_map_fds failed\n"); + return -ENOMEM; + } + obj->nr_map_fds = nr_maps; + + /* fill all fd with -1 */ + memset(obj->map_fds, -1, sizeof(int) * nr_maps); + + pfd = obj->map_fds; + for (i = 0; i < nr_maps; i++) { + struct bpf_map_def def; + + def = *(struct bpf_map_def *)(obj->maps_buf + + i * sizeof(struct bpf_map_def)); + + *pfd = bpf_create_map(def.type, + def.key_size, + def.value_size, + def.max_entries); + if (*pfd < 0) { + size_t j; + int err = *pfd; + + pr_warning("failed to create map: %s\n", + strerror(errno)); + for (j = 0; j < i; j++) + zclose(obj->map_fds[j]); + obj->nr_map_fds = 0; + zfree(&obj->map_fds); + return err; + } + pr_debug("create map: fd=%d\n", *pfd); + pfd++; + } + + zfree(&obj->maps_buf); + obj->maps_buf_sz = 0; + return 0; +} + static int bpf_object__collect_reloc(struct bpf_object *obj) { int i, err; @@ -668,6 +733,42 @@ struct bpf_object *bpf_object__open_buffer(void *obj_buf, return __bpf_object__open("[buffer]", obj_buf, obj_buf_sz); } +int bpf_object__unload(struct bpf_object *obj) +{ + size_t i; + + if (!obj) + return -EINVAL; + + for (i = 0; i < obj->nr_map_fds; i++) + zclose(obj->map_fds[i]); + zfree(&obj->map_fds); + obj->nr_map_fds = 0; + + return 0; +} + +int bpf_object__load(struct bpf_object *obj) +{ + if (!obj) + return -EINVAL; + + if (obj->loaded) { + pr_warning("object should not be loaded twice\n"); + return -EINVAL; + } + + obj->loaded = true; + if (bpf_object__create_maps(obj)) + goto out; + + return 0; +out: + bpf_object__unload(obj); + pr_warning("failed to load object '%s'\n", obj->path); + return -EINVAL; +} + void bpf_object__close(struct bpf_object *obj) { size_t i; @@ -676,6 +777,7 @@ void bpf_object__close(struct bpf_object *obj) return; bpf_object__elf_finish(obj); + bpf_object__unload(obj); zfree(&obj->maps_buf); diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index 6e75acdb9112..3e6960075835 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -30,6 +30,10 @@ struct bpf_object *bpf_object__open_buffer(void *obj_buf, size_t obj_buf_sz); void bpf_object__close(struct bpf_object *object); +/* Load/unload object into/from kernel */ +int bpf_object__load(struct bpf_object *obj); +int bpf_object__unload(struct bpf_object *obj); + /* * We don't need __attribute__((packed)) now since it is * unnecessary for 'bpf_map_def' because they are all aligned.