diff options
| author | Andrii Nakryiko <andriin@fb.com> | 2019-02-15 19:52:18 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2019-02-16 18:47:18 -0800 |
| commit | 5aab392c55c96f9bb26d9294f965f156a87ee81c (patch) | |
| tree | cf7663d2962d5e78e4bd2cd6f7f9f09da1964086 | |
| parent | 9d6b3584a7a9d7fa872cb17ceda7a3b208f441eb (diff) | |
tools/libbpf: support bigger BTF data sizes
While it's understandable why kernel limits number of BTF types to 65535
and size of string section to 64KB, in libbpf as user-space library it's
too restrictive. E.g., pahole converting DWARF to BTF type information
for Linux kernel generates more than 3 million BTF types and more than
3MB of strings, before deduplication. So to allow btf__dedup() to do its
work, we need to be able to load bigger BTF sections using btf__new().
Singed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
| -rw-r--r-- | tools/lib/bpf/btf.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c index ade1c32fb083..68b50e9bbde1 100644 --- a/tools/lib/bpf/btf.c +++ b/tools/lib/bpf/btf.c @@ -16,7 +16,8 @@ #define max(a, b) ((a) > (b) ? (a) : (b)) #define min(a, b) ((a) < (b) ? (a) : (b)) -#define BTF_MAX_NR_TYPES 65535 +#define BTF_MAX_NR_TYPES 0x7fffffff +#define BTF_MAX_STR_OFFSET 0x7fffffff #define IS_MODIFIER(k) (((k) == BTF_KIND_TYPEDEF) || \ ((k) == BTF_KIND_VOLATILE) || \ @@ -175,7 +176,7 @@ static int btf_parse_str_sec(struct btf *btf) const char *start = btf->nohdr_data + hdr->str_off; const char *end = start + btf->hdr->str_len; - if (!hdr->str_len || hdr->str_len - 1 > BTF_MAX_NAME_OFFSET || + if (!hdr->str_len || hdr->str_len - 1 > BTF_MAX_STR_OFFSET || start[0] || end[-1]) { pr_debug("Invalid BTF string section\n"); return -EINVAL; @@ -1882,7 +1883,7 @@ static int btf_dedup_prim_types(struct btf_dedup *d) */ static inline bool is_type_mapped(struct btf_dedup *d, uint32_t type_id) { - return d->map[type_id] <= BTF_MAX_TYPE; + return d->map[type_id] <= BTF_MAX_NR_TYPES; } /* @@ -2033,7 +2034,7 @@ static int btf_dedup_is_equiv(struct btf_dedup *d, __u32 cand_id, canon_id = resolve_fwd_id(d, canon_id); hypot_type_id = d->hypot_map[canon_id]; - if (hypot_type_id <= BTF_MAX_TYPE) + if (hypot_type_id <= BTF_MAX_NR_TYPES) return hypot_type_id == cand_id; if (btf_dedup_hypot_map_add(d, canon_id, cand_id)) @@ -2252,7 +2253,7 @@ static int btf_dedup_struct_type(struct btf_dedup *d, __u32 type_id) __u32 h; /* already deduped or is in process of deduping (loop detected) */ - if (d->map[type_id] <= BTF_MAX_TYPE) + if (d->map[type_id] <= BTF_MAX_NR_TYPES) return 0; t = d->btf->types[type_id]; @@ -2329,7 +2330,7 @@ static int btf_dedup_ref_type(struct btf_dedup *d, __u32 type_id) if (d->map[type_id] == BTF_IN_PROGRESS_ID) return -ELOOP; - if (d->map[type_id] <= BTF_MAX_TYPE) + if (d->map[type_id] <= BTF_MAX_NR_TYPES) return resolve_type_id(d, type_id); t = d->btf->types[type_id]; @@ -2509,7 +2510,7 @@ static int btf_dedup_remap_type_id(struct btf_dedup *d, __u32 type_id) resolved_type_id = resolve_type_id(d, type_id); new_type_id = d->hypot_map[resolved_type_id]; - if (new_type_id > BTF_MAX_TYPE) + if (new_type_id > BTF_MAX_NR_TYPES) return -EINVAL; return new_type_id; } |