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Commit 13bfff25 authored Dec 07, 2016 by Eric Dumazet Committed by David S. Miller Dec 08, 2016

net: rfs: add a jump label



RFS is not commonly used, so add a jump label to avoid some conditionals
in fast path.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent c9fba3ed

include/linux/netdevice.h

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -192,6 +192,7 @@ struct net_device_stats {
	#ifdef CONFIG_RPS		#ifdef CONFIG_RPS
	#include <linux/static_key.h>		#include <linux/static_key.h>
	extern struct static_key rps_needed;		extern struct static_key rps_needed;
			extern struct static_key rfs_needed;
	#endif		#endif

	struct neighbour;		struct neighbour;

include/net/sock.h

+14 −11

Original line number	Original line	Diff line number	Diff line
	@@ -913,7 +913,9 @@ static inline void sock_rps_record_flow_hash(__u32 hash)
	static inline void sock_rps_record_flow(const struct sock *sk)		static inline void sock_rps_record_flow(const struct sock *sk)
	{		{
	#ifdef CONFIG_RPS		#ifdef CONFIG_RPS
	/* Reading sk->sk_rxhash might incur an expensive cache line miss.		if (static_key_false(&rfs_needed)) {
			/* Reading sk->sk_rxhash might incur an expensive cache line
			* miss.
	*		*
	* TCP_ESTABLISHED does cover almost all states where RFS		* TCP_ESTABLISHED does cover almost all states where RFS
	* might be useful, and is cheaper [1] than testing :		* might be useful, and is cheaper [1] than testing :
	@@ -924,6 +926,7 @@ static inline void sock_rps_record_flow(const struct sock *sk)
	*/		*/
	if (sk->sk_state == TCP_ESTABLISHED)		if (sk->sk_state == TCP_ESTABLISHED)
	sock_rps_record_flow_hash(sk->sk_rxhash);		sock_rps_record_flow_hash(sk->sk_rxhash);
			}
	#endif		#endif
	}		}

net/core/dev.c

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -3447,6 +3447,8 @@ EXPORT_SYMBOL(rps_cpu_mask);

	struct static_key rps_needed __read_mostly;		struct static_key rps_needed __read_mostly;
	EXPORT_SYMBOL(rps_needed);		EXPORT_SYMBOL(rps_needed);
			struct static_key rfs_needed __read_mostly;
			EXPORT_SYMBOL(rfs_needed);

	static struct rps_dev_flow *		static struct rps_dev_flow *
	set_rps_cpu(struct net_device dev, struct sk_buff skb,		set_rps_cpu(struct net_device dev, struct sk_buff skb,

net/core/sysctl_net_core.c

+4 −1

Original line number	Original line	Diff line number	Diff line
	@@ -79,10 +79,13 @@ static int rps_sock_flow_sysctl(struct ctl_table *table, int write,

	if (sock_table != orig_sock_table) {		if (sock_table != orig_sock_table) {
	rcu_assign_pointer(rps_sock_flow_table, sock_table);		rcu_assign_pointer(rps_sock_flow_table, sock_table);
	if (sock_table)		if (sock_table) {
	static_key_slow_inc(&rps_needed);		static_key_slow_inc(&rps_needed);
			static_key_slow_inc(&rfs_needed);
			}
	if (orig_sock_table) {		if (orig_sock_table) {
	static_key_slow_dec(&rps_needed);		static_key_slow_dec(&rps_needed);
			static_key_slow_dec(&rfs_needed);
	synchronize_rcu();		synchronize_rcu();
	vfree(orig_sock_table);		vfree(orig_sock_table);
	}		}

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