diff mbox series

[RFC,bpf-next,v4,2/6] bpf: Parse and support "uptr" tag.

Message ID 20240816191213.35573-3-thinker.li@gmail.com (mailing list archive)
State RFC
Delegated to: BPF
Headers show
Series Share user memory to BPF program through task storage map. | expand

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netdev/cc_maintainers warning 9 maintainers not CCed: sdf@fomichev.me eddyz87@gmail.com haoluo@google.com jolsa@kernel.org daniel@iogearbox.net song@kernel.org yonghong.song@linux.dev kpsingh@kernel.org john.fastabend@gmail.com
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Commit Message

Kui-Feng Lee Aug. 16, 2024, 7:12 p.m. UTC 
Parse "uptr" tag from BTF, map it to BPF_UPTR, and support it in related
functions. "uptr" tag is used to annotate a field in a struct type is a
uptr, which is used to share a block memory between user programs and BPF
programs.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
---
 kernel/bpf/btf.c     | 5 +++++
 kernel/bpf/syscall.c | 2 ++
 2 files changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index ab3c9f592c9f..f61bad288385 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -3356,6 +3356,8 @@  static int btf_find_kptr(const struct btf *btf, const struct btf_type *t,
 		type = BPF_KPTR_REF;
 	else if (!strcmp("percpu_kptr", __btf_name_by_offset(btf, t->name_off)))
 		type = BPF_KPTR_PERCPU;
+	else if (!strcmp("uptr", __btf_name_by_offset(btf, t->name_off)))
+		type = BPF_UPTR;
 	else
 		return -EINVAL;
 
@@ -3533,6 +3535,7 @@  static int btf_repeat_fields(struct btf_field_info *info,
 		case BPF_KPTR_UNREF:
 		case BPF_KPTR_REF:
 		case BPF_KPTR_PERCPU:
+		case BPF_UPTR:
 		case BPF_LIST_HEAD:
 		case BPF_RB_ROOT:
 			break;
@@ -3659,6 +3662,7 @@  static int btf_find_field_one(const struct btf *btf,
 	case BPF_KPTR_UNREF:
 	case BPF_KPTR_REF:
 	case BPF_KPTR_PERCPU:
+	case BPF_UPTR:
 		ret = btf_find_kptr(btf, var_type, off, sz,
 				    info_cnt ? &info[0] : &tmp);
 		if (ret < 0)
@@ -3983,6 +3987,7 @@  struct btf_record *btf_parse_fields(const struct btf *btf, const struct btf_type
 		case BPF_KPTR_UNREF:
 		case BPF_KPTR_REF:
 		case BPF_KPTR_PERCPU:
+		case BPF_UPTR:
 			ret = btf_parse_kptr(btf, &rec->fields[i], &info_arr[i]);
 			if (ret < 0)
 				goto end;
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 65dcd92d0b2c..fed4a2145f81 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -548,6 +548,7 @@  void btf_record_free(struct btf_record *rec)
 		case BPF_KPTR_UNREF:
 		case BPF_KPTR_REF:
 		case BPF_KPTR_PERCPU:
+		case BPF_UPTR:
 			if (rec->fields[i].kptr.module)
 				module_put(rec->fields[i].kptr.module);
 			btf_put(rec->fields[i].kptr.btf);
@@ -596,6 +597,7 @@  struct btf_record *btf_record_dup(const struct btf_record *rec)
 		case BPF_KPTR_UNREF:
 		case BPF_KPTR_REF:
 		case BPF_KPTR_PERCPU:
+		case BPF_UPTR:
 			btf_get(fields[i].kptr.btf);
 			if (fields[i].kptr.module && !try_module_get(fields[i].kptr.module)) {
 				ret = -ENXIO;