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net: introduce SO_INCOMING_CPU

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Alternative to RPS/RFS is to use hardware support for multiple
queues.

Then split a set of million of sockets into worker threads, each
one using epoll() to manage events on its own socket pool.

Ideally, we want one thread per RX/TX queue/cpu, but we have no way to
know after accept() or connect() on which queue/cpu a socket is managed.

We normally use one cpu per RX queue (IRQ smp_affinity being properly
set), so remembering on socket structure which cpu delivered last packet
is enough to solve the problem.

After accept(), connect(), or even file descriptor passing around
processes, applications can use :

 int cpu;
 socklen_t len = sizeof(cpu);

 getsockopt(fd, SOL_SOCKET, SO_INCOMING_CPU, &cpu, &len);

And use this information to put the socket into the right silo
for optimal performance, as all networking stack should run
on the appropriate cpu, without need to send IPI (RPS/RFS).

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-11-11 05:54:28 -08:00 committed by David S. Miller
parent 3d97379a67
commit 2c8c56e15d
21 changed files with 52 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/alpha/include/uapi/asm/socket.h
View File

@ -87,4 +87,6 @@
#define SO_BPF_EXTENSIONS 48
#define SO_INCOMING_CPU 49
#endif /* _UAPI_ASM_SOCKET_H */

2
arch/avr32/include/uapi/asm/socket.h
View File

@ -80,4 +80,6 @@
#define SO_BPF_EXTENSIONS 48
#define SO_INCOMING_CPU 49
#endif /* _UAPI__ASM_AVR32_SOCKET_H */

2
arch/cris/include/uapi/asm/socket.h
View File

@ -82,6 +82,8 @@
#define SO_BPF_EXTENSIONS 48
#define SO_INCOMING_CPU 49
#endif /* _ASM_SOCKET_H */

2
arch/frv/include/uapi/asm/socket.h
View File

@ -80,5 +80,7 @@
#define SO_BPF_EXTENSIONS 48
#define SO_INCOMING_CPU 49
#endif /* _ASM_SOCKET_H */

2
arch/ia64/include/uapi/asm/socket.h
View File

@ -89,4 +89,6 @@
#define SO_BPF_EXTENSIONS 48
#define SO_INCOMING_CPU 49
#endif /* _ASM_IA64_SOCKET_H */

2
arch/m32r/include/uapi/asm/socket.h
View File

@ -80,4 +80,6 @@
#define SO_BPF_EXTENSIONS 48
#define SO_INCOMING_CPU 49
#endif /* _ASM_M32R_SOCKET_H */

2
arch/mips/include/uapi/asm/socket.h
View File

@ -98,4 +98,6 @@
#define SO_BPF_EXTENSIONS 48
#define SO_INCOMING_CPU 49
#endif /* _UAPI_ASM_SOCKET_H */

2
arch/mn10300/include/uapi/asm/socket.h
View File

@ -80,4 +80,6 @@
#define SO_BPF_EXTENSIONS 48
#define SO_INCOMING_CPU 49
#endif /* _ASM_SOCKET_H */

2
arch/parisc/include/uapi/asm/socket.h
View File

@ -79,4 +79,6 @@
#define SO_BPF_EXTENSIONS 0x4029
#define SO_INCOMING_CPU 0x402A
#endif /* _UAPI_ASM_SOCKET_H */

2
arch/powerpc/include/uapi/asm/socket.h
View File

@ -87,4 +87,6 @@
#define SO_BPF_EXTENSIONS 48
#define SO_INCOMING_CPU 49
#endif /* _ASM_POWERPC_SOCKET_H */

2
arch/s390/include/uapi/asm/socket.h
View File

@ -86,4 +86,6 @@
#define SO_BPF_EXTENSIONS 48
#define SO_INCOMING_CPU 49
#endif /* _ASM_SOCKET_H */

2
arch/sparc/include/uapi/asm/socket.h
View File

@ -76,6 +76,8 @@
#define SO_BPF_EXTENSIONS 0x0032
#define SO_INCOMING_CPU 0x0033
/* Security levels - as per NRL IPv6 - don't actually do anything */
#define SO_SECURITY_AUTHENTICATION 0x5001
#define SO_SECURITY_ENCRYPTION_TRANSPORT 0x5002

2
arch/xtensa/include/uapi/asm/socket.h
View File

@ -91,4 +91,6 @@
#define SO_BPF_EXTENSIONS 48
#define SO_INCOMING_CPU 49
#endif /* _XTENSA_SOCKET_H */

12
include/net/sock.h
View File

@ -273,6 +273,7 @@ struct cg_proto;
* @sk_rcvtimeo: %SO_RCVTIMEO setting
* @sk_sndtimeo: %SO_SNDTIMEO setting
* @sk_rxhash: flow hash received from netif layer
* @sk_incoming_cpu: record cpu processing incoming packets
* @sk_txhash: computed flow hash for use on transmit
* @sk_filter: socket filtering instructions
* @sk_protinfo: private area, net family specific, when not using slab
@ -350,6 +351,12 @@ struct sock {
#ifdef CONFIG_RPS
__u32 sk_rxhash;
#endif
u16 sk_incoming_cpu;
/* 16bit hole
* Warned : sk_incoming_cpu can be set from softirq,
* Do not use this hole without fully understanding possible issues.
*/
__u32 sk_txhash;
#ifdef CONFIG_NET_RX_BUSY_POLL
unsigned int sk_napi_id;
@ -833,6 +840,11 @@ static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
return sk->sk_backlog_rcv(sk, skb);
}
static inline void sk_incoming_cpu_update(struct sock *sk)
{
sk->sk_incoming_cpu = raw_smp_processor_id();
}
static inline void sock_rps_record_flow_hash(__u32 hash)
{
#ifdef CONFIG_RPS

2
include/uapi/asm-generic/socket.h
View File

@ -82,4 +82,6 @@
#define SO_BPF_EXTENSIONS 48
#define SO_INCOMING_CPU 49
#endif /* __ASM_GENERIC_SOCKET_H */

5
net/core/sock.c
View File

@ -1213,6 +1213,10 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
v.val = sk->sk_max_pacing_rate;
break;
case SO_INCOMING_CPU:
v.val = sk->sk_incoming_cpu;
break;
default:
return -ENOPROTOOPT;
}
@ -1517,6 +1521,7 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
newsk->sk_err = 0;
newsk->sk_priority = 0;
newsk->sk_incoming_cpu = raw_smp_processor_id();
/*
* Before updating sk_refcnt, we must commit prior changes to memory
* (Documentation/RCU/rculist_nulls.txt for details)

1
net/ipv4/tcp_ipv4.c
View File

@ -1663,6 +1663,7 @@ process:
if (sk_filter(sk, skb))
goto discard_and_relse;
sk_incoming_cpu_update(sk);
skb->dev = NULL;
bh_lock_sock_nested(sk);

1
net/ipv4/udp.c
View File

@ -1445,6 +1445,7 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
if (inet_sk(sk)->inet_daddr) {
sock_rps_save_rxhash(sk, skb);
sk_mark_napi_id(sk, skb);
sk_incoming_cpu_update(sk);
}
rc = sock_queue_rcv_skb(sk, skb);

1
net/ipv6/tcp_ipv6.c
View File

@ -1456,6 +1456,7 @@ process:
if (sk_filter(sk, skb))
goto discard_and_relse;
sk_incoming_cpu_update(sk);
skb->dev = NULL;
bh_lock_sock_nested(sk);

1
net/ipv6/udp.c
View File

@ -577,6 +577,7 @@ static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
sock_rps_save_rxhash(sk, skb);
sk_mark_napi_id(sk, skb);
sk_incoming_cpu_update(sk);
}
rc = sock_queue_rcv_skb(sk, skb);

5
net/sctp/ulpqueue.c
View File

@ -205,9 +205,10 @@ int sctp_ulpq_tail_event(struct sctp_ulpq *ulpq, struct sctp_ulpevent *event)
if (sock_flag(sk, SOCK_DEAD) || (sk->sk_shutdown & RCV_SHUTDOWN))
goto out_free;
if (!sctp_ulpevent_is_notification(event))
if (!sctp_ulpevent_is_notification(event)) {
sk_mark_napi_id(sk, skb);
sk_incoming_cpu_update(sk);
}
/* Check if the user wishes to receive this event. */
if (!sctp_ulpevent_is_enabled(event, &sctp_sk(sk)->subscribe))
goto out_free;