btf: separate btf creation and loading

This change splits out previous btf__new functionality of constructing
struct btf and loading it into kernel into two:
- btf__new() just creates and initializes struct btf
- btf__load() attempts to load existing struct btf into kernel

btf__free will still close BTF fd, if it was ever loaded successfully
into kernel.

This change allows users of libbpf to manipulate BTF using its API,
without the need to unnecessarily load it into kernel.

One of the intended use cases is pahole, which will do DWARF to BTF
conversion and then use libbpf to do type deduplication, while then
handling ELF sections overwriting and other concerns on its own.

Fixes: 2d3feca8c44f ("bpf: btf: print map dump and lookup with btf info")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 4324eb4..46db0a3 100644 (file)
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -367,8 +367,6 @@ void btf__free(struct btf *btf)
 
 struct btf *btf__new(__u8 *data, __u32 size)
 {
-       __u32 log_buf_size = 0;
-       char *log_buf = NULL;
        struct btf *btf;
        int err;
 
@@ -378,15 +376,6 @@ struct btf *btf__new(__u8 *data, __u32 size)
 
        btf->fd = -1;
 
-       log_buf = malloc(BPF_LOG_BUF_SIZE);
-       if (!log_buf) {
-               err = -ENOMEM;
-               goto done;
-       }
-
-       *log_buf = 0;
-       log_buf_size = BPF_LOG_BUF_SIZE;
-
        btf->data = malloc(size);
        if (!btf->data) {
                err = -ENOMEM;
@@ -396,17 +385,6 @@ struct btf *btf__new(__u8 *data, __u32 size)
        memcpy(btf->data, data, size);
        btf->data_size = size;
 
-       btf->fd = bpf_load_btf(btf->data, btf->data_size,
-                              log_buf, log_buf_size, false);
-
-       if (btf->fd == -1) {
-               err = -errno;
-               pr_warning("Error loading BTF: %s(%d)\n", strerror(errno), errno);
-               if (log_buf && *log_buf)
-                       pr_warning("%s\n", log_buf);
-               goto done;
-       }
-
        err = btf_parse_hdr(btf);
        if (err)
                goto done;
@@ -418,8 +396,6 @@ struct btf *btf__new(__u8 *data, __u32 size)
        err = btf_parse_type_sec(btf);
 
 done:
-       free(log_buf);
-
        if (err) {
                btf__free(btf);
                return ERR_PTR(err);
@@ -428,6 +404,36 @@ done:
        return btf;
 }
 
+int btf__load(struct btf *btf)
+{
+       __u32 log_buf_size = BPF_LOG_BUF_SIZE;
+       char *log_buf = NULL;
+       int err = 0;
+
+       if (btf->fd >= 0)
+               return -EEXIST;
+
+       log_buf = malloc(log_buf_size);
+       if (!log_buf)
+               return -ENOMEM;
+
+       *log_buf = 0;
+
+       btf->fd = bpf_load_btf(btf->data, btf->data_size,
+                              log_buf, log_buf_size, false);
+       if (btf->fd < 0) {
+               err = -errno;
+               pr_warning("Error loading BTF: %s(%d)\n", strerror(errno), errno);
+               if (*log_buf)
+                       pr_warning("%s\n", log_buf);
+               goto done;
+       }
+
+done:
+       free(log_buf);
+       return err;
+}
+
 int btf__fd(const struct btf *btf)
 {
        return btf->fd;

diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index b393da9..f55b7bc 100644 (file)
--- a/tools/lib/bpf/btf.h
+++ b/tools/lib/bpf/btf.h
@@ -57,6 +57,7 @@ struct btf_ext_header {
 
 LIBBPF_API void btf__free(struct btf *btf);
 LIBBPF_API struct btf *btf__new(__u8 *data, __u32 size);
+LIBBPF_API int btf__load(struct btf *btf);
 LIBBPF_API __s32 btf__find_by_name(const struct btf *btf,
                                   const char *type_name);
 LIBBPF_API __u32 btf__get_nr_types(const struct btf *btf);

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 8d64ada..e3c39ed 100644 (file)
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -836,7 +836,7 @@ static int bpf_object__elf_collect(struct bpf_object *obj, int flags)
                        obj->efile.maps_shndx = idx;
                else if (strcmp(name, BTF_ELF_SEC) == 0) {
                        obj->btf = btf__new(data->d_buf, data->d_size);
-                       if (IS_ERR(obj->btf)) {
+                       if (IS_ERR(obj->btf) || btf__load(obj->btf)) {
                                pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
                                           BTF_ELF_SEC, PTR_ERR(obj->btf));
                                obj->btf = NULL;

diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 89c1149..f5372df 100644 (file)
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -137,6 +137,7 @@ LIBBPF_0.0.2 {
                btf__get_map_kv_tids;
                btf__get_nr_types;
                btf__get_strings;
+               btf__load;
                btf_ext__free;
                btf_ext__func_info_rec_size;
                btf_ext__line_info_rec_size;