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net: openvswitch: add masks cache hit counter

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Add a counter that counts the number of masks cache hits, and
export it through the megaflow netlink statistics.

Reviewed-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eelco Chaudron
2020-07-31 14:20:56 +02:00
committed by David S. Miller
parent d6526926de
commit 9d2f627b7e
5 changed files with 24 additions and 8 deletions
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net/openvswitch/flow_table.c
+14 -5
View File
@@ -667,6 +667,7 @@ static struct sw_flow *flow_lookup(struct flow_table *tbl,
struct mask_array *ma,
const struct sw_flow_key *key,
u32 *n_mask_hit,
u32 *n_cache_hit,
u32 *index)
{
u64 *usage_counters = this_cpu_ptr(ma->masks_usage_cntr);
@@ -682,6 +683,7 @@ static struct sw_flow *flow_lookup(struct flow_table *tbl,
u64_stats_update_begin(&ma->syncp);
usage_counters[*index]++;
u64_stats_update_end(&ma->syncp);
(*n_cache_hit)++;
return flow;
}
}
@@ -719,7 +721,8 @@ static struct sw_flow *flow_lookup(struct flow_table *tbl,
struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
const struct sw_flow_key *key,
u32 skb_hash,
u32 *n_mask_hit)
u32 *n_mask_hit,
u32 *n_cache_hit)
{
struct mask_array *ma = rcu_dereference(tbl->mask_array);
struct table_instance *ti = rcu_dereference(tbl->ti);
@@ -729,10 +732,13 @@ struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
int seg;
*n_mask_hit = 0;
*n_cache_hit = 0;
if (unlikely(!skb_hash)) {
u32 mask_index = 0;
u32 cache = 0;
return flow_lookup(tbl, ti, ma, key, n_mask_hit, &mask_index);
return flow_lookup(tbl, ti, ma, key, n_mask_hit, &cache,
&mask_index);
}
/* Pre and post recirulation flows usually have the same skb_hash
@@ -753,7 +759,7 @@ struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
e = &entries[index];
if (e->skb_hash == skb_hash) {
flow = flow_lookup(tbl, ti, ma, key, n_mask_hit,
&e->mask_index);
n_cache_hit, &e->mask_index);
if (!flow)
e->skb_hash = 0;
return flow;
@@ -766,10 +772,12 @@ struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
}
/* Cache miss, do full lookup. */
flow = flow_lookup(tbl, ti, ma, key, n_mask_hit, &ce->mask_index);
flow = flow_lookup(tbl, ti, ma, key, n_mask_hit, n_cache_hit,
&ce->mask_index);
if (flow)
ce->skb_hash = skb_hash;
*n_cache_hit = 0;
return flow;
}
@@ -779,9 +787,10 @@ struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl,
struct table_instance *ti = rcu_dereference_ovsl(tbl->ti);
struct mask_array *ma = rcu_dereference_ovsl(tbl->mask_array);
u32 __always_unused n_mask_hit;
u32 __always_unused n_cache_hit;
u32 index = 0;
return flow_lookup(tbl, ti, ma, key, &n_mask_hit, &index);
return flow_lookup(tbl, ti, ma, key, &n_mask_hit, &n_cache_hit, &index);
}
struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,