netdev - [PATCH v3 bpf-next 1/2] bpftool: Use print_entry_error() in case of ENOENT when dumping

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Date:   Mon, 15 Apr 2019 16:15:35 +0900
From:   Benjamin Poirier <bpoirier@...e.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        David Ahern <dsahern@...il.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH v3 bpf-next 1/2] bpftool: Use print_entry_error() in case of ENOENT when dumping

Commit bf598a8f0f77 ("bpftool: Improve handling of ENOENT on map dumps")
used print_entry_plain() in case of ENOENT. However, that commit introduces
dead code. Per-cpu maps are zero-filled. When reading them, it's all or
nothing. There will never be a case where some cpus have an entry and
others don't.

The truth is that ENOENT is an error case. Use print_entry_error() to
output the desired message. That function's "value" parameter is also
renamed to indicate that we never use it for an actual map value.

The output format is unchanged.

Signed-off-by: Benjamin Poirier <bpoirier@...e.com>
---
 tools/bpf/bpftool/map.c | 33 ++++++++++++++-------------------
 1 file changed, 14 insertions(+), 19 deletions(-)

diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
index e96903078991..df958af56b6c 100644
--- a/tools/bpf/bpftool/map.c
+++ b/tools/bpf/bpftool/map.c
@@ -261,20 +261,20 @@ static void print_entry_json(struct bpf_map_info *info, unsigned char *key,
 }
 
 static void print_entry_error(struct bpf_map_info *info, unsigned char *key,
-			      const char *value)
+			      const char *error_msg)
 {
-	int value_size = strlen(value);
+	int msg_size = strlen(error_msg);
 	bool single_line, break_names;
 
-	break_names = info->key_size > 16 || value_size > 16;
-	single_line = info->key_size + value_size <= 24 && !break_names;
+	break_names = info->key_size > 16 || msg_size > 16;
+	single_line = info->key_size + msg_size <= 24 && !break_names;
 
 	printf("key:%c", break_names ? '\n' : ' ');
 	fprint_hex(stdout, key, info->key_size, " ");
 
 	printf(single_line ? "  " : "\n");
 
-	printf("value:%c%s", break_names ? '\n' : ' ', value);
+	printf("value:%c%s", break_names ? '\n' : ' ', error_msg);
 
 	printf("\n");
 }
@@ -298,11 +298,7 @@ static void print_entry_plain(struct bpf_map_info *info, unsigned char *key,
 
 		if (info->value_size) {
 			printf("value:%c", break_names ? '\n' : ' ');
-			if (value)
-				fprint_hex(stdout, value, info->value_size,
-					   " ");
-			else
-				printf("<no entry>");
+			fprint_hex(stdout, value, info->value_size, " ");
 		}
 
 		printf("\n");
@@ -321,11 +317,8 @@ static void print_entry_plain(struct bpf_map_info *info, unsigned char *key,
 			for (i = 0; i < n; i++) {
 				printf("value (CPU %02d):%c",
 				       i, info->value_size > 16 ? '\n' : ' ');
-				if (value)
-					fprint_hex(stdout, value + i * step,
-						   info->value_size, " ");
-				else
-					printf("<no entry>");
+				fprint_hex(stdout, value + i * step,
+					   info->value_size, " ");
 				printf("\n");
 			}
 		}
@@ -722,11 +715,13 @@ static int dump_map_elem(int fd, void *key, void *value,
 		jsonw_string_field(json_wtr, "error", strerror(lookup_errno));
 		jsonw_end_object(json_wtr);
 	} else {
+		const char *msg = NULL;
+
 		if (errno == ENOENT)
-			print_entry_plain(map_info, key, NULL);
-		else
-			print_entry_error(map_info, key,
-					  strerror(lookup_errno));
+			msg = "<no entry>";
+
+		print_entry_error(map_info, key,
+				  msg ? : strerror(lookup_errno));
 	}
 
 	return 0;
-- 
2.21.0