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libbpf: Support BTF_KIND_TYPE_TAG

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Add libbpf support for BTF_KIND_TYPE_TAG.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211112012614.1505315-1-yhs@fb.com
This commit is contained in:
Yonghong Song
2021-11-11 17:26:14 -08:00
committed by Andrii Nakryiko
parent d932a1a46b
commit 98181e0546
6 changed files with 73 additions and 2 deletions
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23
src/btf.c
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@@ -299,6 +299,7 @@ static int btf_type_size(const struct btf_type *t)
case BTF_KIND_TYPEDEF:
case BTF_KIND_FUNC:
case BTF_KIND_FLOAT:
case BTF_KIND_TYPE_TAG:
return base_size;
case BTF_KIND_INT:
return base_size + sizeof(__u32);
@@ -349,6 +350,7 @@ static int btf_bswap_type_rest(struct btf_type *t)
case BTF_KIND_TYPEDEF:
case BTF_KIND_FUNC:
case BTF_KIND_FLOAT:
case BTF_KIND_TYPE_TAG:
return 0;
case BTF_KIND_INT:
*(__u32 *)(t + 1) = bswap_32(*(__u32 *)(t + 1));
@@ -649,6 +651,7 @@ int btf__align_of(const struct btf *btf, __u32 id)
case BTF_KIND_VOLATILE:
case BTF_KIND_CONST:
case BTF_KIND_RESTRICT:
case BTF_KIND_TYPE_TAG:
return btf__align_of(btf, t->type);
case BTF_KIND_ARRAY:
return btf__align_of(btf, btf_array(t)->type);
@@ -2235,6 +2238,22 @@ int btf__add_restrict(struct btf *btf, int ref_type_id)
return btf_add_ref_kind(btf, BTF_KIND_RESTRICT, NULL, ref_type_id);
}
/*
* Append new BTF_KIND_TYPE_TAG type with:
* - *value*, non-empty/non-NULL tag value;
* - *ref_type_id* - referenced type ID, it might not exist yet;
* Returns:
* - >0, type ID of newly added BTF type;
* - <0, on error.
*/
int btf__add_type_tag(struct btf *btf, const char *value, int ref_type_id)
{
if (!value|| !value[0])
return libbpf_err(-EINVAL);
return btf_add_ref_kind(btf, BTF_KIND_TYPE_TAG, value, ref_type_id);
}
/*
* Append new BTF_KIND_FUNC type with:
* - *name*, non-empty/non-NULL name;
@@ -3639,6 +3658,7 @@ static int btf_dedup_prep(struct btf_dedup *d)
case BTF_KIND_TYPEDEF:
case BTF_KIND_FUNC:
case BTF_KIND_FLOAT:
case BTF_KIND_TYPE_TAG:
h = btf_hash_common(t);
break;
case BTF_KIND_INT:
@@ -3699,6 +3719,7 @@ static int btf_dedup_prim_type(struct btf_dedup *d, __u32 type_id)
case BTF_KIND_VAR:
case BTF_KIND_DATASEC:
case BTF_KIND_DECL_TAG:
case BTF_KIND_TYPE_TAG:
return 0;
case BTF_KIND_INT:
@@ -4297,6 +4318,7 @@ static int btf_dedup_ref_type(struct btf_dedup *d, __u32 type_id)
case BTF_KIND_PTR:
case BTF_KIND_TYPEDEF:
case BTF_KIND_FUNC:
case BTF_KIND_TYPE_TAG:
ref_type_id = btf_dedup_ref_type(d, t->type);
if (ref_type_id < 0)
return ref_type_id;
@@ -4603,6 +4625,7 @@ int btf_type_visit_type_ids(struct btf_type *t, type_id_visit_fn visit, void *ct
case BTF_KIND_FUNC:
case BTF_KIND_VAR:
case BTF_KIND_DECL_TAG:
case BTF_KIND_TYPE_TAG:
return visit(&t->type, ctx);
case BTF_KIND_ARRAY: {