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openvswitch: collect mega flow mask stats

Browse source 
Collect mega flow mask stats. ovs-dpctl show command can be used to
display them for debugging and performance tuning.

Signed-off-by: Andy Zhou <azhou@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
This commit is contained in:
Andy Zhou 2013-10-22 10:42:46 -07:00 committed by Jesse Gross
parent 618ed0c805
commit 1bd7116f1c
5 changed files with 67 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
include/uapi/linux/openvswitch.h
View file

@ -63,15 +63,18 @@ enum ovs_datapath_cmd {
* not be sent.
* @OVS_DP_ATTR_STATS: Statistics about packets that have passed through the
* datapath. Always present in notifications.
* @OVS_DP_ATTR_MEGAFLOW_STATS: Statistics about mega flow masks usage for the
* datapath. Always present in notifications.
*
* These attributes follow the &struct ovs_header within the Generic Netlink
* payload for %OVS_DP_* commands.
*/
enum ovs_datapath_attr {
OVS_DP_ATTR_UNSPEC,
OVS_DP_ATTR_NAME, /* name of dp_ifindex netdev */
OVS_DP_ATTR_UPCALL_PID, /* Netlink PID to receive upcalls */
OVS_DP_ATTR_STATS, /* struct ovs_dp_stats */
OVS_DP_ATTR_NAME, /* name of dp_ifindex netdev */
OVS_DP_ATTR_UPCALL_PID, /* Netlink PID to receive upcalls */
OVS_DP_ATTR_STATS, /* struct ovs_dp_stats */
OVS_DP_ATTR_MEGAFLOW_STATS, /* struct ovs_dp_megaflow_stats */
__OVS_DP_ATTR_MAX
};
@ -84,6 +87,14 @@ struct ovs_dp_stats {
__u64 n_flows; /* Number of flows present */
};
struct ovs_dp_megaflow_stats {
__u64 n_mask_hit; /* Number of masks used for flow lookups. */
__u32 n_masks; /* Number of masks for the datapath. */
__u32 pad0; /* Pad for future expension. */
__u64 pad1; /* Pad for future expension. */
__u64 pad2; /* Pad for future expension. */
};
struct ovs_vport_stats {
__u64 rx_packets; /* total packets received */
__u64 tx_packets; /* total packets transmitted */

38
net/openvswitch/datapath.c
View file

@ -221,6 +221,7 @@ void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
struct dp_stats_percpu *stats;
struct sw_flow_key key;
u64 *stats_counter;
u32 n_mask_hit;
int error;
stats = this_cpu_ptr(dp->stats_percpu);
@ -233,7 +234,7 @@ void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
}
/* Look up flow. */
flow = ovs_flow_tbl_lookup(&dp->table, &key);
flow = ovs_flow_tbl_lookup(&dp->table, &key, &n_mask_hit);
if (unlikely(!flow)) {
struct dp_upcall_info upcall;
@ -258,6 +259,7 @@ void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
/* Update datapath statistics. */
u64_stats_update_begin(&stats->sync);
(*stats_counter)++;
stats->n_mask_hit += n_mask_hit;
u64_stats_update_end(&stats->sync);
}
@ -563,13 +565,18 @@ static struct genl_ops dp_packet_genl_ops[] = {
}
};
static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
struct ovs_dp_megaflow_stats *mega_stats)
{
int i;
memset(mega_stats, 0, sizeof(*mega_stats));
stats->n_flows = ovs_flow_tbl_count(&dp->table);
mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
stats->n_hit = stats->n_missed = stats->n_lost = 0;
for_each_possible_cpu(i) {
const struct dp_stats_percpu *percpu_stats;
struct dp_stats_percpu local_stats;
@ -585,6 +592,7 @@ static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
stats->n_hit += local_stats.n_hit;
stats->n_missed += local_stats.n_missed;
stats->n_lost += local_stats.n_lost;
mega_stats->n_mask_hit += local_stats.n_mask_hit;
}
}
@ -743,6 +751,14 @@ static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
return skb;
}
static struct sw_flow *__ovs_flow_tbl_lookup(struct flow_table *tbl,
const struct sw_flow_key *key)
{
u32 __always_unused n_mask_hit;
return ovs_flow_tbl_lookup(tbl, key, &n_mask_hit);
}
static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
@ -793,7 +809,7 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
goto err_unlock_ovs;
/* Check if this is a duplicate flow */
flow = ovs_flow_tbl_lookup(&dp->table, &key);
flow = __ovs_flow_tbl_lookup(&dp->table, &key);
if (!flow) {
/* Bail out if we're not allowed to create a new flow. */
error = -ENOENT;
@ -905,7 +921,7 @@ static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
goto unlock;
}
flow = ovs_flow_tbl_lookup(&dp->table, &key);
flow = __ovs_flow_tbl_lookup(&dp->table, &key);
if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
err = -ENOENT;
goto unlock;
@ -953,7 +969,7 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
if (err)
goto unlock;
flow = ovs_flow_tbl_lookup(&dp->table, &key);
flow = __ovs_flow_tbl_lookup(&dp->table, &key);
if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
err = -ENOENT;
goto unlock;
@ -1067,6 +1083,7 @@ static size_t ovs_dp_cmd_msg_size(void)
msgsize += nla_total_size(IFNAMSIZ);
msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
return msgsize;
}
@ -1076,6 +1093,7 @@ static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
{
struct ovs_header *ovs_header;
struct ovs_dp_stats dp_stats;
struct ovs_dp_megaflow_stats dp_megaflow_stats;
int err;
ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
@ -1091,8 +1109,14 @@ static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
if (err)
goto nla_put_failure;
get_dp_stats(dp, &dp_stats);
if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
&dp_stats))
goto nla_put_failure;
if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
sizeof(struct ovs_dp_megaflow_stats),
&dp_megaflow_stats))
goto nla_put_failure;
return genlmsg_end(skb, ovs_header);

4
net/openvswitch/datapath.h
View file

@ -46,11 +46,15 @@
* @n_lost: Number of received packets that had no matching flow in the flow
* table that could not be sent to userspace (normally due to an overflow in
* one of the datapath's queues).
* @n_mask_hit: Number of masks looked up for flow match.
* @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked
* up per packet.
*/
struct dp_stats_percpu {
u64 n_hit;
u64 n_missed;
u64 n_lost;
u64 n_mask_hit;
struct u64_stats_sync sync;
};

16
net/openvswitch/flow_table.c
View file

@ -430,13 +430,16 @@ static struct sw_flow *masked_flow_lookup(struct table_instance *ti,
}
struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl,
const struct sw_flow_key *key)
const struct sw_flow_key *key,
u32 *n_mask_hit)
{
struct table_instance *ti = rcu_dereference(tbl->ti);
struct sw_flow_mask *mask;
struct sw_flow *flow;
*n_mask_hit = 0;
list_for_each_entry_rcu(mask, &tbl->mask_list, list) {
(*n_mask_hit)++;
flow = masked_flow_lookup(ti, key, mask);
if (flow) /* Found */
return flow;
@ -444,6 +447,17 @@ struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl,
return NULL;
}
int ovs_flow_tbl_num_masks(const struct flow_table *table)
{
struct sw_flow_mask *mask;
int num = 0;
list_for_each_entry(mask, &table->mask_list, list)
num++;
return num;
}
static struct table_instance *table_instance_expand(struct table_instance *ti)
{
return table_instance_rehash(ti, ti->n_buckets * 2);

4
net/openvswitch/flow_table.h
View file

@ -66,10 +66,12 @@ int ovs_flow_tbl_flush(struct flow_table *flow_table);
int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
struct sw_flow_mask *mask);
void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
int ovs_flow_tbl_num_masks(const struct flow_table *table);
struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *table,
u32 *bucket, u32 *idx);
struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *,
const struct sw_flow_key *);
const struct sw_flow_key *,
u32 *n_mask_hit);
bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
struct sw_flow_match *match);