openvswitch: Per cpu flow stats.
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
Jesse Gross
parent
795449d8b8
commit
e298e50570
@ -251,9 +251,9 @@ void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
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OVS_CB(skb)->flow = flow;
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OVS_CB(skb)->pkt_key = &key;
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stats_counter = &stats->n_hit;
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ovs_flow_used(OVS_CB(skb)->flow, skb);
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ovs_flow_stats_update(OVS_CB(skb)->flow, skb);
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ovs_execute_actions(dp, skb);
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stats_counter = &stats->n_hit;
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out:
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/* Update datapath statistics. */
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@ -459,14 +459,6 @@ out:
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return err;
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}
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static void clear_stats(struct sw_flow *flow)
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{
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flow->used = 0;
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flow->tcp_flags = 0;
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flow->packet_count = 0;
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flow->byte_count = 0;
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}
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static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
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{
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struct ovs_header *ovs_header = info->userhdr;
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@ -505,7 +497,7 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
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packet->protocol = htons(ETH_P_802_2);
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/* Build an sw_flow for sending this packet. */
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flow = ovs_flow_alloc();
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flow = ovs_flow_alloc(false);
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err = PTR_ERR(flow);
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if (IS_ERR(flow))
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goto err_kfree_skb;
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@ -641,10 +633,10 @@ static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
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const int skb_orig_len = skb->len;
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struct nlattr *start;
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struct ovs_flow_stats stats;
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__be16 tcp_flags;
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unsigned long used;
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struct ovs_header *ovs_header;
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struct nlattr *nla;
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unsigned long used;
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u8 tcp_flags;
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int err;
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ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
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@ -673,24 +665,17 @@ static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
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nla_nest_end(skb, nla);
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spin_lock_bh(&flow->lock);
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used = flow->used;
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stats.n_packets = flow->packet_count;
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stats.n_bytes = flow->byte_count;
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tcp_flags = (u8)ntohs(flow->tcp_flags);
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spin_unlock_bh(&flow->lock);
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ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
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if (used &&
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nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
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goto nla_put_failure;
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if (stats.n_packets &&
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nla_put(skb, OVS_FLOW_ATTR_STATS,
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sizeof(struct ovs_flow_stats), &stats))
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nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
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goto nla_put_failure;
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if (tcp_flags &&
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nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
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if ((u8)ntohs(tcp_flags) &&
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nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
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goto nla_put_failure;
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/* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
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@ -770,6 +755,7 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
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struct datapath *dp;
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struct sw_flow_actions *acts = NULL;
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struct sw_flow_match match;
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bool exact_5tuple;
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int error;
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/* Extract key. */
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@ -778,7 +764,7 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
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goto error;
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ovs_match_init(&match, &key, &mask);
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error = ovs_nla_get_match(&match,
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error = ovs_nla_get_match(&match, &exact_5tuple,
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a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
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if (error)
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goto error;
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@ -817,12 +803,11 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
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goto err_unlock_ovs;
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/* Allocate flow. */
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flow = ovs_flow_alloc();
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flow = ovs_flow_alloc(!exact_5tuple);
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if (IS_ERR(flow)) {
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error = PTR_ERR(flow);
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goto err_unlock_ovs;
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}
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clear_stats(flow);
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flow->key = masked_key;
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flow->unmasked_key = key;
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@ -866,11 +851,8 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
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reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
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/* Clear stats. */
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if (a[OVS_FLOW_ATTR_CLEAR]) {
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spin_lock_bh(&flow->lock);
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clear_stats(flow);
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spin_unlock_bh(&flow->lock);
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}
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if (a[OVS_FLOW_ATTR_CLEAR])
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ovs_flow_stats_clear(flow);
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}
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ovs_unlock();
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@ -908,7 +890,7 @@ static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
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}
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ovs_match_init(&match, &key, NULL);
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err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
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err = ovs_nla_get_match(&match, NULL, a[OVS_FLOW_ATTR_KEY], NULL);
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if (err)
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return err;
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@ -962,7 +944,7 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
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}
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ovs_match_init(&match, &key, NULL);
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err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
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err = ovs_nla_get_match(&match, NULL, a[OVS_FLOW_ATTR_KEY], NULL);
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if (err)
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goto unlock;
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@ -35,6 +35,7 @@
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/sctp.h>
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#include <linux/smp.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <linux/icmp.h>
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@ -60,10 +61,16 @@ u64 ovs_flow_used_time(unsigned long flow_jiffies)
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#define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
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void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb)
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void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb)
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{
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struct flow_stats *stats;
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__be16 tcp_flags = 0;
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if (!flow->stats.is_percpu)
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stats = flow->stats.stat;
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else
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stats = this_cpu_ptr(flow->stats.cpu_stats);
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if ((flow->key.eth.type == htons(ETH_P_IP) ||
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flow->key.eth.type == htons(ETH_P_IPV6)) &&
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flow->key.ip.proto == IPPROTO_TCP &&
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@ -71,12 +78,87 @@ void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb)
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tcp_flags = TCP_FLAGS_BE16(tcp_hdr(skb));
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}
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spin_lock(&flow->lock);
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flow->used = jiffies;
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flow->packet_count++;
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flow->byte_count += skb->len;
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flow->tcp_flags |= tcp_flags;
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spin_unlock(&flow->lock);
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spin_lock(&stats->lock);
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stats->used = jiffies;
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stats->packet_count++;
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stats->byte_count += skb->len;
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stats->tcp_flags |= tcp_flags;
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spin_unlock(&stats->lock);
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}
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static void stats_read(struct flow_stats *stats,
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struct ovs_flow_stats *ovs_stats,
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unsigned long *used, __be16 *tcp_flags)
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{
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spin_lock(&stats->lock);
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if (time_after(stats->used, *used))
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*used = stats->used;
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*tcp_flags |= stats->tcp_flags;
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ovs_stats->n_packets += stats->packet_count;
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ovs_stats->n_bytes += stats->byte_count;
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spin_unlock(&stats->lock);
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}
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void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *ovs_stats,
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unsigned long *used, __be16 *tcp_flags)
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{
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int cpu, cur_cpu;
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*used = 0;
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*tcp_flags = 0;
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memset(ovs_stats, 0, sizeof(*ovs_stats));
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if (!flow->stats.is_percpu) {
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stats_read(flow->stats.stat, ovs_stats, used, tcp_flags);
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} else {
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cur_cpu = get_cpu();
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for_each_possible_cpu(cpu) {
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struct flow_stats *stats;
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if (cpu == cur_cpu)
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local_bh_disable();
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stats = per_cpu_ptr(flow->stats.cpu_stats, cpu);
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stats_read(stats, ovs_stats, used, tcp_flags);
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if (cpu == cur_cpu)
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local_bh_enable();
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}
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put_cpu();
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}
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}
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static void stats_reset(struct flow_stats *stats)
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{
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spin_lock(&stats->lock);
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stats->used = 0;
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stats->packet_count = 0;
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stats->byte_count = 0;
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stats->tcp_flags = 0;
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spin_unlock(&stats->lock);
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}
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void ovs_flow_stats_clear(struct sw_flow *flow)
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{
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int cpu, cur_cpu;
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if (!flow->stats.is_percpu) {
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stats_reset(flow->stats.stat);
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} else {
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cur_cpu = get_cpu();
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for_each_possible_cpu(cpu) {
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if (cpu == cur_cpu)
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local_bh_disable();
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stats_reset(per_cpu_ptr(flow->stats.cpu_stats, cpu));
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if (cpu == cur_cpu)
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local_bh_enable();
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}
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put_cpu();
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}
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}
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static int check_header(struct sk_buff *skb, int len)
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@ -19,6 +19,7 @@
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#ifndef FLOW_H
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#define FLOW_H 1
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#include <linux/cache.h>
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#include <linux/kernel.h>
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#include <linux/netlink.h>
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#include <linux/openvswitch.h>
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@ -146,6 +147,22 @@ struct sw_flow_actions {
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struct nlattr actions[];
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};
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struct flow_stats {
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u64 packet_count; /* Number of packets matched. */
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u64 byte_count; /* Number of bytes matched. */
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unsigned long used; /* Last used time (in jiffies). */
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spinlock_t lock; /* Lock for atomic stats update. */
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__be16 tcp_flags; /* Union of seen TCP flags. */
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};
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struct sw_flow_stats {
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bool is_percpu;
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union {
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struct flow_stats *stat;
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struct flow_stats __percpu *cpu_stats;
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};
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};
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struct sw_flow {
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struct rcu_head rcu;
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struct hlist_node hash_node[2];
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@ -155,12 +172,7 @@ struct sw_flow {
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struct sw_flow_key unmasked_key;
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struct sw_flow_mask *mask;
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struct sw_flow_actions __rcu *sf_acts;
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spinlock_t lock; /* Lock for values below. */
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unsigned long used; /* Last used time (in jiffies). */
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u64 packet_count; /* Number of packets matched. */
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u64 byte_count; /* Number of bytes matched. */
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__be16 tcp_flags; /* Union of seen TCP flags. */
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struct sw_flow_stats stats;
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};
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struct arp_eth_header {
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@ -177,7 +189,10 @@ struct arp_eth_header {
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unsigned char ar_tip[4]; /* target IP address */
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} __packed;
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void ovs_flow_used(struct sw_flow *, struct sk_buff *);
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void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb);
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void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *stats,
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unsigned long *used, __be16 *tcp_flags);
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void ovs_flow_stats_clear(struct sw_flow *flow);
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u64 ovs_flow_used_time(unsigned long flow_jiffies);
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int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *);
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@ -266,6 +266,20 @@ static bool is_all_zero(const u8 *fp, size_t size)
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return true;
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}
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static bool is_all_set(const u8 *fp, size_t size)
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{
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int i;
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if (!fp)
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return false;
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for (i = 0; i < size; i++)
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if (fp[i] != 0xff)
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return false;
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return true;
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}
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static int __parse_flow_nlattrs(const struct nlattr *attr,
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const struct nlattr *a[],
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u64 *attrsp, bool nz)
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@ -487,8 +501,9 @@ static int metadata_from_nlattrs(struct sw_flow_match *match, u64 *attrs,
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return 0;
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}
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static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
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const struct nlattr **a, bool is_mask)
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static int ovs_key_from_nlattrs(struct sw_flow_match *match, bool *exact_5tuple,
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u64 attrs, const struct nlattr **a,
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bool is_mask)
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{
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int err;
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u64 orig_attrs = attrs;
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@ -545,6 +560,11 @@ static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
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SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
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}
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if (is_mask && exact_5tuple) {
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if (match->mask->key.eth.type != htons(0xffff))
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*exact_5tuple = false;
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}
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if (attrs & (1 << OVS_KEY_ATTR_IPV4)) {
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const struct ovs_key_ipv4 *ipv4_key;
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@ -567,6 +587,13 @@ static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
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SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
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ipv4_key->ipv4_dst, is_mask);
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attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
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if (is_mask && exact_5tuple && *exact_5tuple) {
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if (ipv4_key->ipv4_proto != 0xff ||
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ipv4_key->ipv4_src != htonl(0xffffffff) ||
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ipv4_key->ipv4_dst != htonl(0xffffffff))
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*exact_5tuple = false;
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}
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}
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if (attrs & (1 << OVS_KEY_ATTR_IPV6)) {
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@ -598,6 +625,13 @@ static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
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is_mask);
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attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
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if (is_mask && exact_5tuple && *exact_5tuple) {
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if (ipv6_key->ipv6_proto != 0xff ||
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!is_all_set((u8 *)ipv6_key->ipv6_src, sizeof(match->key->ipv6.addr.src)) ||
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!is_all_set((u8 *)ipv6_key->ipv6_dst, sizeof(match->key->ipv6.addr.dst)))
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*exact_5tuple = false;
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}
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}
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if (attrs & (1 << OVS_KEY_ATTR_ARP)) {
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@ -640,6 +674,11 @@ static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
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tcp_key->tcp_dst, is_mask);
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}
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attrs &= ~(1 << OVS_KEY_ATTR_TCP);
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if (is_mask && exact_5tuple && *exact_5tuple &&
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(tcp_key->tcp_src != htons(0xffff) ||
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tcp_key->tcp_dst != htons(0xffff)))
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*exact_5tuple = false;
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}
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if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) {
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@ -671,6 +710,11 @@ static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
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udp_key->udp_dst, is_mask);
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}
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attrs &= ~(1 << OVS_KEY_ATTR_UDP);
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if (is_mask && exact_5tuple && *exact_5tuple &&
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(udp_key->udp_src != htons(0xffff) ||
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udp_key->udp_dst != htons(0xffff)))
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*exact_5tuple = false;
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}
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if (attrs & (1 << OVS_KEY_ATTR_SCTP)) {
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@ -756,6 +800,7 @@ static void sw_flow_mask_set(struct sw_flow_mask *mask,
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* attribute specifies the mask field of the wildcarded flow.
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*/
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int ovs_nla_get_match(struct sw_flow_match *match,
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bool *exact_5tuple,
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const struct nlattr *key,
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const struct nlattr *mask)
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{
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@ -803,10 +848,13 @@ int ovs_nla_get_match(struct sw_flow_match *match,
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}
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}
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||||
|
||||
err = ovs_key_from_nlattrs(match, key_attrs, a, false);
|
||||
err = ovs_key_from_nlattrs(match, NULL, key_attrs, a, false);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
if (exact_5tuple)
|
||||
*exact_5tuple = true;
|
||||
|
||||
if (mask) {
|
||||
err = parse_flow_mask_nlattrs(mask, a, &mask_attrs);
|
||||
if (err)
|
||||
@ -844,7 +892,7 @@ int ovs_nla_get_match(struct sw_flow_match *match,
|
||||
}
|
||||
}
|
||||
|
||||
err = ovs_key_from_nlattrs(match, mask_attrs, a, true);
|
||||
err = ovs_key_from_nlattrs(match, exact_5tuple, mask_attrs, a, true);
|
||||
if (err)
|
||||
return err;
|
||||
} else {
|
||||
|
||||
@ -45,6 +45,7 @@ int ovs_nla_put_flow(const struct sw_flow_key *,
|
||||
int ovs_nla_get_flow_metadata(struct sw_flow *flow,
|
||||
const struct nlattr *attr);
|
||||
int ovs_nla_get_match(struct sw_flow_match *match,
|
||||
bool *exact_5tuple,
|
||||
const struct nlattr *,
|
||||
const struct nlattr *);
|
||||
|
||||
|
||||
@ -72,19 +72,42 @@ void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src,
|
||||
*d++ = *s++ & *m++;
|
||||
}
|
||||
|
||||
struct sw_flow *ovs_flow_alloc(void)
|
||||
struct sw_flow *ovs_flow_alloc(bool percpu_stats)
|
||||
{
|
||||
struct sw_flow *flow;
|
||||
int cpu;
|
||||
|
||||
flow = kmem_cache_alloc(flow_cache, GFP_KERNEL);
|
||||
if (!flow)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
spin_lock_init(&flow->lock);
|
||||
flow->sf_acts = NULL;
|
||||
flow->mask = NULL;
|
||||
|
||||
flow->stats.is_percpu = percpu_stats;
|
||||
|
||||
if (!percpu_stats) {
|
||||
flow->stats.stat = kzalloc(sizeof(*flow->stats.stat), GFP_KERNEL);
|
||||
if (!flow->stats.stat)
|
||||
goto err;
|
||||
|
||||
spin_lock_init(&flow->stats.stat->lock);
|
||||
} else {
|
||||
flow->stats.cpu_stats = alloc_percpu(struct flow_stats);
|
||||
if (!flow->stats.cpu_stats)
|
||||
goto err;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
struct flow_stats *cpu_stats;
|
||||
|
||||
cpu_stats = per_cpu_ptr(flow->stats.cpu_stats, cpu);
|
||||
spin_lock_init(&cpu_stats->lock);
|
||||
}
|
||||
}
|
||||
return flow;
|
||||
err:
|
||||
kfree(flow);
|
||||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
|
||||
int ovs_flow_tbl_count(struct flow_table *table)
|
||||
@ -118,6 +141,10 @@ static struct flex_array *alloc_buckets(unsigned int n_buckets)
|
||||
static void flow_free(struct sw_flow *flow)
|
||||
{
|
||||
kfree((struct sf_flow_acts __force *)flow->sf_acts);
|
||||
if (flow->stats.is_percpu)
|
||||
free_percpu(flow->stats.cpu_stats);
|
||||
else
|
||||
kfree(flow->stats.stat);
|
||||
kmem_cache_free(flow_cache, flow);
|
||||
}
|
||||
|
||||
|
||||
@ -55,7 +55,7 @@ struct flow_table {
|
||||
int ovs_flow_init(void);
|
||||
void ovs_flow_exit(void);
|
||||
|
||||
struct sw_flow *ovs_flow_alloc(void);
|
||||
struct sw_flow *ovs_flow_alloc(bool percpu_stats);
|
||||
void ovs_flow_free(struct sw_flow *, bool deferred);
|
||||
|
||||
int ovs_flow_tbl_init(struct flow_table *);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user