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Commit 1bd7116f authored by Andy Zhou's avatar Andy Zhou Committed by Jesse Gross
Browse files

openvswitch: collect mega flow mask stats 



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

Signed-off-by: default avatarAndy Zhou <azhou@nicira.com>
Signed-off-by: default avatarJesse Gross <jesse@nicira.com>
parent 618ed0c8

include/uapi/linux/openvswitch.h

+14 −3
Original line number Diff line number Diff line
@@ -63,6 +63,8 @@ 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.
@@ -72,6 +74,7 @@ enum ovs_datapath_attr { 
	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    */

net/openvswitch/datapath.c

+31 −7
Original line number Diff line number Diff line
@@ -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 @@ out: 
	/* 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);

net/openvswitch/datapath.h

+4 −0
Original line number Diff line number Diff line
@@ -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;

};

net/openvswitch/flow_table.c

+15 −1
Original line number Diff line number Diff line
@@ -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);

net/openvswitch/flow_table.h

+3 −1
Original line number Diff line number Diff line
@@ -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);