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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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96
net/openvswitch/flow.c
View file

@ -35,6 +35,7 @@
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/sctp.h>
#include <linux/smp.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/icmp.h>
@ -60,10 +61,16 @@ u64 ovs_flow_used_time(unsigned long flow_jiffies)
#define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb)
void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb)
{
struct flow_stats *stats;
__be16 tcp_flags = 0;
if (!flow->stats.is_percpu)
stats = flow->stats.stat;
else
stats = this_cpu_ptr(flow->stats.cpu_stats);
if ((flow->key.eth.type == htons(ETH_P_IP) ||
flow->key.eth.type == htons(ETH_P_IPV6)) &&
flow->key.ip.proto == IPPROTO_TCP &&
@ -71,12 +78,87 @@ void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb)
tcp_flags = TCP_FLAGS_BE16(tcp_hdr(skb));
}
spin_lock(&flow->lock);
flow->used = jiffies;
flow->packet_count++;
flow->byte_count += skb->len;
flow->tcp_flags |= tcp_flags;
spin_unlock(&flow->lock);
spin_lock(&stats->lock);
stats->used = jiffies;
stats->packet_count++;
stats->byte_count += skb->len;
stats->tcp_flags |= tcp_flags;
spin_unlock(&stats->lock);
}
static void stats_read(struct flow_stats *stats,
struct ovs_flow_stats *ovs_stats,
unsigned long *used, __be16 *tcp_flags)
{
spin_lock(&stats->lock);
if (time_after(stats->used, *used))
*used = stats->used;
*tcp_flags |= stats->tcp_flags;
ovs_stats->n_packets += stats->packet_count;
ovs_stats->n_bytes += stats->byte_count;
spin_unlock(&stats->lock);
}
void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *ovs_stats,
unsigned long *used, __be16 *tcp_flags)
{
int cpu, cur_cpu;
*used = 0;
*tcp_flags = 0;
memset(ovs_stats, 0, sizeof(*ovs_stats));
if (!flow->stats.is_percpu) {
stats_read(flow->stats.stat, ovs_stats, used, tcp_flags);
} else {
cur_cpu = get_cpu();
for_each_possible_cpu(cpu) {
struct flow_stats *stats;
if (cpu == cur_cpu)
local_bh_disable();
stats = per_cpu_ptr(flow->stats.cpu_stats, cpu);
stats_read(stats, ovs_stats, used, tcp_flags);
if (cpu == cur_cpu)
local_bh_enable();
}
put_cpu();
}
}
static void stats_reset(struct flow_stats *stats)
{
spin_lock(&stats->lock);
stats->used = 0;
stats->packet_count = 0;
stats->byte_count = 0;
stats->tcp_flags = 0;
spin_unlock(&stats->lock);
}
void ovs_flow_stats_clear(struct sw_flow *flow)
{
int cpu, cur_cpu;
if (!flow->stats.is_percpu) {
stats_reset(flow->stats.stat);
} else {
cur_cpu = get_cpu();
for_each_possible_cpu(cpu) {
if (cpu == cur_cpu)
local_bh_disable();
stats_reset(per_cpu_ptr(flow->stats.cpu_stats, cpu));
if (cpu == cur_cpu)
local_bh_enable();
}
put_cpu();
}
}
static int check_header(struct sk_buff *skb, int len)