linux-kernel - [PATCH bpf-next v2] bpf/btf: Use btf_type

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Date:   Fri, 16 Sep 2022 13:28:00 -0700
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Martin KaFai Lau <martin.lau@...ux.dev>
Cc:     Peilin Ye <peilin.ye@...edance.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peilin Ye <yepeilin.cs@...il.com>
Subject: [PATCH bpf-next v2] bpf/btf: Use btf_type_str() whenever possible

From: Peilin Ye <peilin.ye@...edance.com>

We have btf_type_str().  Use it whenever possible in btf.c, instead of
"btf_kind_str[BTF_INFO_KIND(t->info)]".

Signed-off-by: Peilin Ye <peilin.ye@...edance.com>
---
change since v1:
  - rebase on bpf-next (Martin KaFai Lau)
  - also use btf_type_str() in __btf_verifier_log_type()

 kernel/bpf/btf.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 98be25d13325..b3940c605aac 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -1397,7 +1397,6 @@ __printf(4, 5) static void __btf_verifier_log_type(struct btf_verifier_env *env,
 						   const char *fmt, ...)
 {
 	struct bpf_verifier_log *log = &env->log;
-	u8 kind = BTF_INFO_KIND(t->info);
 	struct btf *btf = env->btf;
 	va_list args;
 
@@ -1413,7 +1412,7 @@ __printf(4, 5) static void __btf_verifier_log_type(struct btf_verifier_env *env,
 
 	__btf_verifier_log(log, "[%u] %s %s%s",
 			   env->log_type_id,
-			   btf_kind_str[kind],
+			   btf_type_str(t),
 			   __btf_name_by_offset(btf, t->name_off),
 			   log_details ? " " : "");
 
@@ -5427,7 +5426,7 @@ bool btf_ctx_access(int off, int size, enum bpf_access_type type,
 			if (!btf_type_is_small_int(t)) {
 				bpf_log(log,
 					"ret type %s not allowed for fmod_ret\n",
-					btf_kind_str[BTF_INFO_KIND(t->info)]);
+					btf_type_str(t));
 				return false;
 			}
 			break;
@@ -5454,7 +5453,7 @@ bool btf_ctx_access(int off, int size, enum bpf_access_type type,
 			"func '%s' arg%d '%s' has type %s. Only pointer access is allowed\n",
 			tname, arg,
 			__btf_name_by_offset(btf, t->name_off),
-			btf_kind_str[BTF_INFO_KIND(t->info)]);
+			btf_type_str(t));
 		return false;
 	}
 
@@ -5538,11 +5537,11 @@ bool btf_ctx_access(int off, int size, enum bpf_access_type type,
 	if (!btf_type_is_struct(t)) {
 		bpf_log(log,
 			"func '%s' arg%d type %s is not a struct\n",
-			tname, arg, btf_kind_str[BTF_INFO_KIND(t->info)]);
+			tname, arg, btf_type_str(t));
 		return false;
 	}
 	bpf_log(log, "func '%s' arg%d has btf_id %d type %s '%s'\n",
-		tname, arg, info->btf_id, btf_kind_str[BTF_INFO_KIND(t->info)],
+		tname, arg, info->btf_id, btf_type_str(t),
 		__btf_name_by_offset(btf, t->name_off));
 	return true;
 }
@@ -5950,7 +5949,7 @@ int btf_distill_func_proto(struct bpf_verifier_log *log,
 	if (ret < 0 || __btf_type_is_struct(t)) {
 		bpf_log(log,
 			"The function %s return type %s is unsupported.\n",
-			tname, btf_kind_str[BTF_INFO_KIND(t->info)]);
+			tname, btf_type_str(t));
 		return -EINVAL;
 	}
 	m->ret_size = ret;
@@ -5968,7 +5967,7 @@ int btf_distill_func_proto(struct bpf_verifier_log *log,
 		if (ret < 0 || ret > 16) {
 			bpf_log(log,
 				"The function %s arg%d type %s is unsupported.\n",
-				tname, i, btf_kind_str[BTF_INFO_KIND(t->info)]);
+				tname, i, btf_type_str(t));
 			return -EINVAL;
 		}
 		if (ret == 0) {
@@ -6727,7 +6726,7 @@ int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
 			continue;
 		}
 		bpf_log(log, "Arg#%d type %s in %s() is not supported yet.\n",
-			i, btf_kind_str[BTF_INFO_KIND(t->info)], tname);
+			i, btf_type_str(t), tname);
 		return -EINVAL;
 	}
 	return 0;
-- 
2.20.1