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-rw-r--r--tools/bpf/bpftool/btf.c125
-rw-r--r--tools/bpf/bpftool/main.h5
2 files changed, 62 insertions, 68 deletions
diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
index 0cd769adac66..11dd31b6e730 100644
--- a/tools/bpf/bpftool/btf.c
+++ b/tools/bpf/bpftool/btf.c
@@ -8,14 +8,16 @@
#include <stdio.h>
#include <string.h>
#include <unistd.h>
-#include <bpf/bpf.h>
-#include <bpf/btf.h>
-#include <bpf/libbpf.h>
#include <linux/btf.h>
#include <linux/hashtable.h>
#include <sys/types.h>
#include <sys/stat.h>
+#include <bpf/bpf.h>
+#include <bpf/btf.h>
+#include <bpf/hashmap.h>
+#include <bpf/libbpf.h>
+
#include "json_writer.h"
#include "main.h"
@@ -40,14 +42,9 @@ static const char * const btf_kind_str[NR_BTF_KINDS] = {
[BTF_KIND_DECL_TAG] = "DECL_TAG",
};
-struct btf_attach_table {
- DECLARE_HASHTABLE(table, 16);
-};
-
struct btf_attach_point {
__u32 obj_id;
__u32 btf_id;
- struct hlist_node hash;
};
static const char *btf_int_enc_str(__u8 encoding)
@@ -645,21 +642,8 @@ static int btf_parse_fd(int *argc, char ***argv)
return fd;
}
-static void delete_btf_table(struct btf_attach_table *tab)
-{
- struct btf_attach_point *obj;
- struct hlist_node *tmp;
-
- unsigned int bkt;
-
- hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
- hash_del(&obj->hash);
- free(obj);
- }
-}
-
static int
-build_btf_type_table(struct btf_attach_table *tab, enum bpf_obj_type type,
+build_btf_type_table(struct hashmap *tab, enum bpf_obj_type type,
void *info, __u32 *len)
{
static const char * const names[] = {
@@ -667,7 +651,6 @@ build_btf_type_table(struct btf_attach_table *tab, enum bpf_obj_type type,
[BPF_OBJ_PROG] = "prog",
[BPF_OBJ_MAP] = "map",
};
- struct btf_attach_point *obj_node;
__u32 btf_id, id = 0;
int err;
int fd;
@@ -741,28 +724,25 @@ build_btf_type_table(struct btf_attach_table *tab, enum bpf_obj_type type,
if (!btf_id)
continue;
- obj_node = calloc(1, sizeof(*obj_node));
- if (!obj_node) {
- p_err("failed to allocate memory: %s", strerror(errno));
- err = -ENOMEM;
+ err = hashmap__append(tab, u32_as_hash_field(btf_id),
+ u32_as_hash_field(id));
+ if (err) {
+ p_err("failed to append entry to hashmap for BTF ID %u, object ID %u: %s",
+ btf_id, id, strerror(errno));
goto err_free;
}
-
- obj_node->obj_id = id;
- obj_node->btf_id = btf_id;
- hash_add(tab->table, &obj_node->hash, obj_node->btf_id);
}
return 0;
err_free:
- delete_btf_table(tab);
+ hashmap__free(tab);
return err;
}
static int
-build_btf_tables(struct btf_attach_table *btf_prog_table,
- struct btf_attach_table *btf_map_table)
+build_btf_tables(struct hashmap *btf_prog_table,
+ struct hashmap *btf_map_table)
{
struct bpf_prog_info prog_info;
__u32 prog_len = sizeof(prog_info);
@@ -778,7 +758,7 @@ build_btf_tables(struct btf_attach_table *btf_prog_table,
err = build_btf_type_table(btf_map_table, BPF_OBJ_MAP, &map_info,
&map_len);
if (err) {
- delete_btf_table(btf_prog_table);
+ hashmap__free(btf_prog_table);
return err;
}
@@ -787,10 +767,10 @@ build_btf_tables(struct btf_attach_table *btf_prog_table,
static void
show_btf_plain(struct bpf_btf_info *info, int fd,
- struct btf_attach_table *btf_prog_table,
- struct btf_attach_table *btf_map_table)
+ struct hashmap *btf_prog_table,
+ struct hashmap *btf_map_table)
{
- struct btf_attach_point *obj;
+ struct hashmap_entry *entry;
const char *name = u64_to_ptr(info->name);
int n;
@@ -804,18 +784,19 @@ show_btf_plain(struct bpf_btf_info *info, int fd,
printf("size %uB", info->btf_size);
n = 0;
- hash_for_each_possible(btf_prog_table->table, obj, hash, info->id) {
- if (obj->btf_id == info->id)
- printf("%s%u", n++ == 0 ? " prog_ids " : ",",
- obj->obj_id);
+ hashmap__for_each_key_entry(btf_prog_table, entry,
+ u32_as_hash_field(info->id)) {
+ printf("%s%u", n++ == 0 ? " prog_ids " : ",",
+ hash_field_as_u32(entry->value));
}
n = 0;
- hash_for_each_possible(btf_map_table->table, obj, hash, info->id) {
- if (obj->btf_id == info->id)
- printf("%s%u", n++ == 0 ? " map_ids " : ",",
- obj->obj_id);
+ hashmap__for_each_key_entry(btf_map_table, entry,
+ u32_as_hash_field(info->id)) {
+ printf("%s%u", n++ == 0 ? " map_ids " : ",",
+ hash_field_as_u32(entry->value));
}
+
emit_obj_refs_plain(&refs_table, info->id, "\n\tpids ");
printf("\n");
@@ -823,10 +804,10 @@ show_btf_plain(struct bpf_btf_info *info, int fd,
static void
show_btf_json(struct bpf_btf_info *info, int fd,
- struct btf_attach_table *btf_prog_table,
- struct btf_attach_table *btf_map_table)
+ struct hashmap *btf_prog_table,
+ struct hashmap *btf_map_table)
{
- struct btf_attach_point *obj;
+ struct hashmap_entry *entry;
const char *name = u64_to_ptr(info->name);
jsonw_start_object(json_wtr); /* btf object */
@@ -835,19 +816,17 @@ show_btf_json(struct bpf_btf_info *info, int fd,
jsonw_name(json_wtr, "prog_ids");
jsonw_start_array(json_wtr); /* prog_ids */
- hash_for_each_possible(btf_prog_table->table, obj, hash,
- info->id) {
- if (obj->btf_id == info->id)
- jsonw_uint(json_wtr, obj->obj_id);
+ hashmap__for_each_key_entry(btf_prog_table, entry,
+ u32_as_hash_field(info->id)) {
+ jsonw_uint(json_wtr, hash_field_as_u32(entry->value));
}
jsonw_end_array(json_wtr); /* prog_ids */
jsonw_name(json_wtr, "map_ids");
jsonw_start_array(json_wtr); /* map_ids */
- hash_for_each_possible(btf_map_table->table, obj, hash,
- info->id) {
- if (obj->btf_id == info->id)
- jsonw_uint(json_wtr, obj->obj_id);
+ hashmap__for_each_key_entry(btf_map_table, entry,
+ u32_as_hash_field(info->id)) {
+ jsonw_uint(json_wtr, hash_field_as_u32(entry->value));
}
jsonw_end_array(json_wtr); /* map_ids */
@@ -862,8 +841,8 @@ show_btf_json(struct bpf_btf_info *info, int fd,
}
static int
-show_btf(int fd, struct btf_attach_table *btf_prog_table,
- struct btf_attach_table *btf_map_table)
+show_btf(int fd, struct hashmap *btf_prog_table,
+ struct hashmap *btf_map_table)
{
struct bpf_btf_info info;
__u32 len = sizeof(info);
@@ -900,8 +879,8 @@ show_btf(int fd, struct btf_attach_table *btf_prog_table,
static int do_show(int argc, char **argv)
{
- struct btf_attach_table btf_prog_table;
- struct btf_attach_table btf_map_table;
+ struct hashmap *btf_prog_table;
+ struct hashmap *btf_map_table;
int err, fd = -1;
__u32 id = 0;
@@ -917,9 +896,19 @@ static int do_show(int argc, char **argv)
return BAD_ARG();
}
- hash_init(btf_prog_table.table);
- hash_init(btf_map_table.table);
- err = build_btf_tables(&btf_prog_table, &btf_map_table);
+ btf_prog_table = hashmap__new(hash_fn_for_key_as_id,
+ equal_fn_for_key_as_id, NULL);
+ btf_map_table = hashmap__new(hash_fn_for_key_as_id,
+ equal_fn_for_key_as_id, NULL);
+ if (!btf_prog_table || !btf_map_table) {
+ hashmap__free(btf_prog_table);
+ hashmap__free(btf_map_table);
+ if (fd >= 0)
+ close(fd);
+ p_err("failed to create hashmap for object references");
+ return -1;
+ }
+ err = build_btf_tables(btf_prog_table, btf_map_table);
if (err) {
if (fd >= 0)
close(fd);
@@ -928,7 +917,7 @@ static int do_show(int argc, char **argv)
build_obj_refs_table(&refs_table, BPF_OBJ_BTF);
if (fd >= 0) {
- err = show_btf(fd, &btf_prog_table, &btf_map_table);
+ err = show_btf(fd, btf_prog_table, btf_map_table);
close(fd);
goto exit_free;
}
@@ -960,7 +949,7 @@ static int do_show(int argc, char **argv)
break;
}
- err = show_btf(fd, &btf_prog_table, &btf_map_table);
+ err = show_btf(fd, btf_prog_table, btf_map_table);
close(fd);
if (err)
break;
@@ -970,8 +959,8 @@ static int do_show(int argc, char **argv)
jsonw_end_array(json_wtr); /* root array */
exit_free:
- delete_btf_table(&btf_prog_table);
- delete_btf_table(&btf_map_table);
+ hashmap__free(btf_prog_table);
+ hashmap__free(btf_map_table);
delete_obj_refs_table(&refs_table);
return err;
diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h
index 0d64e39573f2..f6f2f951b193 100644
--- a/tools/bpf/bpftool/main.h
+++ b/tools/bpf/bpftool/main.h
@@ -256,6 +256,11 @@ static inline void *u32_as_hash_field(__u32 x)
return (void *)(uintptr_t)x;
}
+static inline __u32 hash_field_as_u32(const void *x)
+{
+ return (__u32)(uintptr_t)x;
+}
+
static inline bool hashmap__empty(struct hashmap *map)
{
return map ? hashmap__size(map) == 0 : true;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 19:04:56 +0100