[bpf-next,v3,01/10] bpf: Introduce TYPE_MATCH related constants/macros

Commit Message

Daniel Müller June 28, 2022, 4:01 p.m. UTC

In order to provide type match support we require a new type of
relocation which, in turn, requires toolchain support. Recent LLVM/Clang
versions support a new value for the last argument to the
__builtin_preserve_type_info builtin, for example.
With this change we introduce the necessary constants into relevant
header files, mirroring what the compiler may support.

Signed-off-by: Daniel Müller <[e-mail]>
---
 include/uapi/linux/bpf.h       | 1 +
 tools/include/uapi/linux/bpf.h | 1 +
 tools/lib/bpf/bpf_core_read.h  | 1 +
 3 files changed, 3 insertions(+)

Patch

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index e81362..42605c 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -6782,6 +6782,7 @@  enum bpf_core_relo_kind {
 	BPF_CORE_TYPE_SIZE = 9,              /* type size in bytes */
 	BPF_CORE_ENUMVAL_EXISTS = 10,        /* enum value existence in target kernel */
 	BPF_CORE_ENUMVAL_VALUE = 11,         /* enum value integer value */
+	BPF_CORE_TYPE_MATCHES = 12,          /* type match in target kernel */
 };
 
 /*
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index e81362..42605c 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -6782,6 +6782,7 @@  enum bpf_core_relo_kind {
 	BPF_CORE_TYPE_SIZE = 9,              /* type size in bytes */
 	BPF_CORE_ENUMVAL_EXISTS = 10,        /* enum value existence in target kernel */
 	BPF_CORE_ENUMVAL_VALUE = 11,         /* enum value integer value */
+	BPF_CORE_TYPE_MATCHES = 12,          /* type match in target kernel */
 };
 
 /*
diff --git a/tools/lib/bpf/bpf_core_read.h b/tools/lib/bpf/bpf_core_read.h
index fd48b1..2308f49 100644
--- a/tools/lib/bpf/bpf_core_read.h
+++ b/tools/lib/bpf/bpf_core_read.h
@@ -29,6 +29,7 @@  enum bpf_type_id_kind {
 enum bpf_type_info_kind {
 	BPF_TYPE_EXISTS = 0,		/* type existence in target kernel */
 	BPF_TYPE_SIZE = 1,		/* type size in target kernel */
+	BPF_TYPE_MATCHES = 2,		/* type match in target kernel */
 };
 
 /* second argument to __builtin_preserve_enum_value() built-in */