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openvswitch: Per cpu flow stats.

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With mega flow implementation ovs flow can be shared between
multiple CPUs which makes stats updates highly contended
operation. This patch uses per-CPU stats in cases where a flow
is likely to be shared (if there is a wildcard in the 5-tuple
and therefore likely to be spread by RSS). In other situations,
it uses the current strategy, saving memory and allocation time.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
This commit is contained in:
Pravin B Shelar
2013-10-29 17:22:21 -07:00
committed by Jesse Gross
parent 795449d8b8
commit e298e50570
7 changed files with 210 additions and 55 deletions
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29
net/openvswitch/flow.h
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@@ -19,6 +19,7 @@
#ifndef FLOW_H
#define FLOW_H 1
#include <linux/cache.h>
#include <linux/kernel.h>
#include <linux/netlink.h>
#include <linux/openvswitch.h>
@@ -146,6 +147,22 @@ struct sw_flow_actions {
struct nlattr actions[];
};
struct flow_stats {
u64 packet_count; /* Number of packets matched. */
u64 byte_count; /* Number of bytes matched. */
unsigned long used; /* Last used time (in jiffies). */
spinlock_t lock; /* Lock for atomic stats update. */
__be16 tcp_flags; /* Union of seen TCP flags. */
};
struct sw_flow_stats {
bool is_percpu;
union {
struct flow_stats *stat;
struct flow_stats __percpu *cpu_stats;
};
};
struct sw_flow {
struct rcu_head rcu;
struct hlist_node hash_node[2];
@@ -155,12 +172,7 @@ struct sw_flow {
struct sw_flow_key unmasked_key;
struct sw_flow_mask *mask;
struct sw_flow_actions __rcu *sf_acts;
spinlock_t lock; /* Lock for values below. */
unsigned long used; /* Last used time (in jiffies). */
u64 packet_count; /* Number of packets matched. */
u64 byte_count; /* Number of bytes matched. */
__be16 tcp_flags; /* Union of seen TCP flags. */
struct sw_flow_stats stats;
};
struct arp_eth_header {
@@ -177,7 +189,10 @@ struct arp_eth_header {
unsigned char ar_tip[4]; /* target IP address */
} __packed;
void ovs_flow_used(struct sw_flow *, struct sk_buff *);
void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb);
void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *stats,
unsigned long *used, __be16 *tcp_flags);
void ovs_flow_stats_clear(struct sw_flow *flow);
u64 ovs_flow_used_time(unsigned long flow_jiffies);
int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *);