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From: Lorenz Bauer <lmb@cloudflare.com>
To: jakub@cloudflare.com, john.fastabend@gmail.com,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Lorenz Bauer <lmb@cloudflare.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>
Cc: kernel-team@cloudflare.com, netdev@vger.kernel.org,
	bpf@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH bpf-next 3/6] bpf: sockmap: call sock_map_update_elem directly
Date: Wed, 19 Aug 2020 10:24:33 +0100	[thread overview]
Message-ID: <20200819092436.58232-4-lmb@cloudflare.com> (raw)
In-Reply-To: <20200819092436.58232-1-lmb@cloudflare.com>

Don't go via map->ops to call sock_map_update_elem, since we know
what function to call in bpf_map_update_value. Since
check_map_func_compatibility doesn't allow calling
BPF_FUNC_map_update_elem from BPF context, we can remove
ops->map_update_elem and rename the function to
sock_map_update_elem_sys.

Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
---
 include/linux/bpf.h  | 7 +++++++
 kernel/bpf/syscall.c | 5 +++--
 net/core/sock_map.c  | 6 ++----
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index cef4ef0d2b4e..cf3416d1b8c2 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1635,6 +1635,7 @@ int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog,
 			 struct bpf_prog *old, u32 which);
 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
+int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
 void sock_map_unhash(struct sock *sk);
 void sock_map_close(struct sock *sk, long timeout);
 #else
@@ -1656,6 +1657,12 @@ static inline int sock_map_prog_detach(const union bpf_attr *attr,
 {
 	return -EOPNOTSUPP;
 }
+
+static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
+					   u64 flags)
+{
+	return -EOPNOTSUPP;
+}
 #endif /* CONFIG_BPF_STREAM_PARSER */
 
 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 2f343ce15747..5867cf615a3c 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -157,10 +157,11 @@ static int bpf_map_update_value(struct bpf_map *map, struct fd f, void *key,
 	if (bpf_map_is_dev_bound(map)) {
 		return bpf_map_offload_update_elem(map, key, value, flags);
 	} else if (map->map_type == BPF_MAP_TYPE_CPUMAP ||
-		   map->map_type == BPF_MAP_TYPE_SOCKHASH ||
-		   map->map_type == BPF_MAP_TYPE_SOCKMAP ||
 		   map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
 		return map->ops->map_update_elem(map, key, value, flags);
+	} else if (map->map_type == BPF_MAP_TYPE_SOCKHASH ||
+		   map->map_type == BPF_MAP_TYPE_SOCKMAP) {
+		return sock_map_update_elem_sys(map, key, value, flags);
 	} else if (IS_FD_PROG_ARRAY(map)) {
 		return bpf_fd_array_map_update_elem(map, f.file, key, value,
 						    flags);
diff --git a/net/core/sock_map.c b/net/core/sock_map.c
index f464a0ebc871..018367fb889f 100644
--- a/net/core/sock_map.c
+++ b/net/core/sock_map.c
@@ -562,8 +562,8 @@ static bool sock_map_sk_state_allowed(const struct sock *sk)
 static int sock_hash_update_common(struct bpf_map *map, void *key,
 				   struct sock *sk, u64 flags);
 
-int sock_map_update_elem(struct bpf_map *map, void *key,
-			 void *value, u64 flags)
+int sock_map_update_elem_sys(struct bpf_map *map, void *key,
+			     void *value, u64 flags)
 {
 	struct socket *sock;
 	struct sock *sk;
@@ -687,7 +687,6 @@ const struct bpf_map_ops sock_map_ops = {
 	.map_free		= sock_map_free,
 	.map_get_next_key	= sock_map_get_next_key,
 	.map_lookup_elem_sys_only = sock_map_lookup_sys,
-	.map_update_elem	= sock_map_update_elem,
 	.map_delete_elem	= sock_map_delete_elem,
 	.map_lookup_elem	= sock_map_lookup,
 	.map_release_uref	= sock_map_release_progs,
@@ -1181,7 +1180,6 @@ const struct bpf_map_ops sock_hash_ops = {
 	.map_alloc		= sock_hash_alloc,
 	.map_free		= sock_hash_free,
 	.map_get_next_key	= sock_hash_get_next_key,
-	.map_update_elem	= sock_map_update_elem,
 	.map_delete_elem	= sock_hash_delete_elem,
 	.map_lookup_elem	= sock_hash_lookup,
 	.map_lookup_elem_sys_only = sock_hash_lookup_sys,
-- 
2.25.1


  parent reply	other threads:[~2020-08-19  9:38 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-19  9:24 [PATCH bpf-next 0/6] Allow updating sockmap / sockhash from BPF Lorenz Bauer
2020-08-19  9:24 ` [PATCH bpf-next 1/6] net: sk_msg: simplify sk_psock initialization Lorenz Bauer
2020-08-19 20:05   ` John Fastabend
2020-08-19  9:24 ` [PATCH bpf-next 2/6] bpf: sockmap: merge sockmap and sockhash update functions Lorenz Bauer
2020-08-19 15:48   ` Jakub Kicinski
2020-08-19 18:50   ` Yonghong Song
2020-08-19 20:11   ` John Fastabend
2020-08-19  9:24 ` Lorenz Bauer [this message]
2020-08-19 19:15   ` [PATCH bpf-next 3/6] bpf: sockmap: call sock_map_update_elem directly Yonghong Song
2020-08-19 20:29   ` John Fastabend
2020-08-19  9:24 ` [PATCH bpf-next 4/6] bpf: override the meaning of ARG_PTR_TO_MAP_VALUE for sockmap and sockhash Lorenz Bauer
2020-08-19 20:13   ` Yonghong Song
2020-08-20 12:33     ` Lorenz Bauer
2020-08-19 20:51   ` John Fastabend
2020-08-19  9:24 ` [PATCH bpf-next 5/6] bpf: sockmap: allow update from BPF Lorenz Bauer
2020-08-19 20:35   ` Yonghong Song
2020-08-19 21:22   ` John Fastabend
2020-08-19 22:41     ` John Fastabend
2020-08-20 11:33       ` Lorenz Bauer
2020-08-20 14:45         ` Yonghong Song
2020-08-19  9:24 ` [PATCH bpf-next 6/6] selftests: bpf: test sockmap " Lorenz Bauer
2020-08-19 20:45   ` Yonghong Song
2020-08-20 11:58     ` Lorenz Bauer
2020-08-20 14:49       ` Yonghong Song
2020-08-20 16:12         ` Lorenz Bauer

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