netdev - [PATCH bpf-next 04/13] bpf: refactor map_get_next

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Date:   Wed, 28 Aug 2019 23:45:06 -0700
From:   Yonghong Song <yhs@...com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...com>,
        Brian Vazquez <brianvv@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>,
        Yonghong Song <yhs@...com>
Subject: [PATCH bpf-next 04/13] bpf: refactor map_get_next_key()

Refactor function map_get_next_key() with a new helper
bpf_map_get_next_key(), which will be used later
for batched map lookup/lookup_and_delete/delete operations.

Signed-off-by: Yonghong Song <yhs@...com>
---
 kernel/bpf/syscall.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index b8bba499df11..06308f0206e5 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1048,6 +1048,20 @@ static int map_delete_elem(union bpf_attr *attr)
 	return err;
 }
 
+static int bpf_map_get_next_key(struct bpf_map *map, void *key, void *next_key)
+{
+	int err;
+
+	if (bpf_map_is_dev_bound(map))
+		return bpf_map_offload_get_next_key(map, key, next_key);
+
+	rcu_read_lock();
+	err = map->ops->map_get_next_key(map, key, next_key);
+	rcu_read_unlock();
+
+	return err;
+}
+
 /* last field in 'union bpf_attr' used by this command */
 #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key
 
@@ -1088,15 +1102,7 @@ static int map_get_next_key(union bpf_attr *attr)
 	if (!next_key)
 		goto free_key;
 
-	if (bpf_map_is_dev_bound(map)) {
-		err = bpf_map_offload_get_next_key(map, key, next_key);
-		goto out;
-	}
-
-	rcu_read_lock();
-	err = map->ops->map_get_next_key(map, key, next_key);
-	rcu_read_unlock();
-out:
+	err = bpf_map_get_next_key(map, key, next_key);
 	if (err)
 		goto free_next_key;
 
-- 
2.17.1