bpf: Add bpf_btf_find_by_name_kind() helper.

Add new helper: long bpf_btf_find_by_name_kind(char *name, int name_sz, u32 kind, int flags) Description Find BTF type with given name and kind in vmlinux BTF or in module's BTFs. Return Returns btf_id and btf_obj_fd in lower and upper 32 bits. It will be used by loader program to find btf_id to attach the program to and to find btf_ids of ksyms.

Alexei Starovoitov committed 5 years ago

Commit 3d784171 parent 387544b5 files · +79 −0Browse files

Showing the changes to tools/include/uapi/linux (1 of 5 files). Show all

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tools/include/uapi/linux/bpf.h+7−0

@@ -4748,6 +4748,12 @@ union bpf_attr { · 4747 unmodified lines
4748	4748	* Execute bpf syscall with given arguments.
4749	4749	* Return
4750	4750	* A syscall result.
	4751	+ *
	4752	+ * long bpf_btf_find_by_name_kind(char *name, int name_sz, u32 kind, int flags)
	4753	+ * Description
	4754	+ * Find BTF type with given name and kind in vmlinux BTF or in module's BTFs.
	4755	+ * Return
	4756	+ * Returns btf_id and btf_obj_fd in lower and upper 32 bits.
4751	4757	*/
4752	4758	#define __BPF_FUNC_MAPPER(FN) \
4753	4759	FN(unspec), \
@@ -4917,6 +4923,7 @@ union bpf_attr { · 163 unmodified lines
4917	4923	FN(for_each_map_elem), \
4918	4924	FN(snprintf), \
4919	4925	FN(sys_bpf), \
	4926	+ FN(btf_find_by_name_kind), \
4920	4927	/* */
4921	4928
4922	4929	/* integer value in 'imm' field of BPF_CALL instruction selects which helper