This is a note to let you know that I've just added the patch titled
udp: lockless UDP_ENCAP_L2TPINUDP / UDP_GRO
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
udp-lockless-udp_encap_l2tpinudp-udp_gro.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 472db66e153fcd0f1d5cf2add1ce2db021489011
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Tue Sep 12 09:17:27 2023 +0000
udp: lockless UDP_ENCAP_L2TPINUDP / UDP_GRO
[ Upstream commit ac9a7f4ce5dda1472e8f44096f33066c6ec1a3b4 ]
Move udp->encap_enabled to udp->udp_flags.
Add udp_test_and_set_bit() helper to allow lockless
udp_tunnel_encap_enable() implementation.
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Stable-dep-of: 70a36f571362 ("udp: annotate data-races around udp->encap_type")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/linux/udp.h b/include/linux/udp.h
index bb2b87adfbea9..0cf83270a4a28 100644
--- a/include/linux/udp.h
+++ b/include/linux/udp.h
@@ -39,6 +39,7 @@ enum {
UDP_FLAGS_GRO_ENABLED, /* Request GRO aggregation */
UDP_FLAGS_ACCEPT_FRAGLIST,
UDP_FLAGS_ACCEPT_L4,
+ UDP_FLAGS_ENCAP_ENABLED, /* This socket enabled encap */
};
struct udp_sock {
@@ -52,11 +53,7 @@ struct udp_sock {
int pending; /* Any pending frames ? */
__u8 encap_type; /* Is this an Encapsulation socket? */
- unsigned char encap_enabled:1; /* This socket enabled encap
- * processing; UDP tunnels and
- * different encapsulation layer set
- * this
- */
+
/* indicator bits used by pcflag: */
#define UDPLITE_BIT 0x1 /* set by udplite proto init function */
#define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
@@ -104,6 +101,8 @@ struct udp_sock {
test_bit(UDP_FLAGS_##nr, &udp_sk(sk)->udp_flags)
#define udp_set_bit(nr, sk) \
set_bit(UDP_FLAGS_##nr, &udp_sk(sk)->udp_flags)
+#define udp_test_and_set_bit(nr, sk) \
+ test_and_set_bit(UDP_FLAGS_##nr, &udp_sk(sk)->udp_flags)
#define udp_clear_bit(nr, sk) \
clear_bit(UDP_FLAGS_##nr, &udp_sk(sk)->udp_flags)
#define udp_assign_bit(nr, sk, val) \
diff --git a/include/net/udp_tunnel.h b/include/net/udp_tunnel.h
index 0ca9b7a11baf5..29251c3519cf0 100644
--- a/include/net/udp_tunnel.h
+++ b/include/net/udp_tunnel.h
@@ -174,16 +174,13 @@ static inline int udp_tunnel_handle_offloads(struct sk_buff *skb, bool udp_csum)
}
#endif
-static inline void udp_tunnel_encap_enable(struct socket *sock)
+static inline void udp_tunnel_encap_enable(struct sock *sk)
{
- struct udp_sock *up = udp_sk(sock->sk);
-
- if (up->encap_enabled)
+ if (udp_test_and_set_bit(ENCAP_ENABLED, sk))
return;
- up->encap_enabled = 1;
#if IS_ENABLED(CONFIG_IPV6)
- if (sock->sk->sk_family == PF_INET6)
+ if (READ_ONCE(sk->sk_family) == PF_INET6)
ipv6_stub->udpv6_encap_enable();
#endif
udp_encap_enable();
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 75ba86a87bb62..637a4faf9aff6 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2618,7 +2618,7 @@ void udp_destroy_sock(struct sock *sk)
if (encap_destroy)
encap_destroy(sk);
}
- if (up->encap_enabled)
+ if (udp_test_bit(ENCAP_ENABLED, sk))
static_branch_dec(&udp_encap_needed_key);
}
}
@@ -2685,9 +2685,7 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
fallthrough;
case UDP_ENCAP_L2TPINUDP:
up->encap_type = val;
- lock_sock(sk);
- udp_tunnel_encap_enable(sk->sk_socket);
- release_sock(sk);
+ udp_tunnel_encap_enable(sk);
break;
default:
err = -ENOPROTOOPT;
@@ -2710,14 +2708,12 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
break;
case UDP_GRO:
- lock_sock(sk);
/* when enabling GRO, accept the related GSO packet type */
if (valbool)
- udp_tunnel_encap_enable(sk->sk_socket);
+ udp_tunnel_encap_enable(sk);
udp_assign_bit(GRO_ENABLED, sk, valbool);
udp_assign_bit(ACCEPT_L4, sk, valbool);
- release_sock(sk);
break;
/*
diff --git a/net/ipv4/udp_tunnel_core.c b/net/ipv4/udp_tunnel_core.c
index 9b18f371af0d4..1e7e4aecdc48a 100644
--- a/net/ipv4/udp_tunnel_core.c
+++ b/net/ipv4/udp_tunnel_core.c
@@ -78,7 +78,7 @@ void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
udp_sk(sk)->gro_receive = cfg->gro_receive;
udp_sk(sk)->gro_complete = cfg->gro_complete;
- udp_tunnel_encap_enable(sock);
+ udp_tunnel_encap_enable(sk);
}
EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 2c3281879b6df..90688877e9004 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1670,7 +1670,7 @@ void udpv6_destroy_sock(struct sock *sk)
if (encap_destroy)
encap_destroy(sk);
}
- if (up->encap_enabled) {
+ if (udp_test_bit(ENCAP_ENABLED, sk)) {
static_branch_dec(&udpv6_encap_needed_key);
udp_encap_disable();
}
