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udp: lockless UDP_ENCAP_L2TPINUDP / UDP_GRO 

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@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Eric Dumazet 2023-09-12 09:17:27 +00:00 committed by Paolo Abeni
parent f5f52f0884
commit ac9a7f4ce5
5 changed files with 12 additions and 20 deletions
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9
include/linux/udp.h
View File

@ -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) \

9
include/net/udp_tunnel.h
View File

@ -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();

10
net/ipv4/udp.c
View File

@ -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;
/*

2
net/ipv4/udp_tunnel_core.c
View File

@ -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);

2
net/ipv6/udp.c
View File

@ -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();
}