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Message-ID: <CAMDZJNVsoUqQcvs4R+MNcrYVkkADRuz8QqHEX=GToT0YofKC6A@mail.gmail.com>
Date: Fri, 24 Jul 2020 10:37:08 +0800
From: Tonghao Zhang <xiangxia.m.yue@...il.com>
To: Eelco Chaudron <echaudro@...hat.com>
Cc: Linux Kernel Network Developers <netdev@...r.kernel.org>,
ovs dev <dev@...nvswitch.org>, Florian Westphal <fw@...len.de>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
David Miller <davem@...emloft.net>
Subject: Re: [ovs-dev] [PATCH net-next v2 1/2] net: openvswitch: add masks
cache hit counter
On Thu, Jul 23, 2020 at 8:58 PM Eelco Chaudron <echaudro@...hat.com> wrote:
>
> Add a counter that counts the number of masks cache hits, and
> export it through the megaflow netlink statistics.
>
> Reviewed-by: Paolo Abeni <pabeni@...hat.com>
> Signed-off-by: Eelco Chaudron <echaudro@...hat.com>
LGTM
Reviewed-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
> ---
> include/uapi/linux/openvswitch.h | 2 +-
> net/openvswitch/datapath.c | 5 ++++-
> net/openvswitch/datapath.h | 3 +++
> net/openvswitch/flow_table.c | 19 ++++++++++++++-----
> net/openvswitch/flow_table.h | 3 ++-
> 5 files changed, 24 insertions(+), 8 deletions(-)
>
> diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
> index 9b14519e74d9..7cb76e5ca7cf 100644
> --- a/include/uapi/linux/openvswitch.h
> +++ b/include/uapi/linux/openvswitch.h
> @@ -102,8 +102,8 @@ 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 n_cache_hit; /* Number of cache matches for flow lookups. */
> __u64 pad1; /* Pad for future expension. */
> - __u64 pad2; /* Pad for future expension. */
> };
>
> struct ovs_vport_stats {
> diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
> index 95805f0e27bd..a54df1fe3ec4 100644
> --- a/net/openvswitch/datapath.c
> +++ b/net/openvswitch/datapath.c
> @@ -225,13 +225,14 @@ void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
> struct dp_stats_percpu *stats;
> u64 *stats_counter;
> u32 n_mask_hit;
> + u32 n_cache_hit;
> int error;
>
> stats = this_cpu_ptr(dp->stats_percpu);
>
> /* Look up flow. */
> flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
> - &n_mask_hit);
> + &n_mask_hit, &n_cache_hit);
> if (unlikely(!flow)) {
> struct dp_upcall_info upcall;
>
> @@ -262,6 +263,7 @@ void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
> u64_stats_update_begin(&stats->syncp);
> (*stats_counter)++;
> stats->n_mask_hit += n_mask_hit;
> + stats->n_cache_hit += n_cache_hit;
> u64_stats_update_end(&stats->syncp);
> }
>
> @@ -699,6 +701,7 @@ static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
> stats->n_missed += local_stats.n_missed;
> stats->n_lost += local_stats.n_lost;
> mega_stats->n_mask_hit += local_stats.n_mask_hit;
> + mega_stats->n_cache_hit += local_stats.n_cache_hit;
> }
> }
>
> diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h
> index 697a2354194b..86d78613edb4 100644
> --- a/net/openvswitch/datapath.h
> +++ b/net/openvswitch/datapath.h
> @@ -38,12 +38,15 @@
> * @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.
> + * @n_cache_hit: The number of received packets that had their mask found using
> + * the mask cache.
> */
> struct dp_stats_percpu {
> u64 n_hit;
> u64 n_missed;
> u64 n_lost;
> u64 n_mask_hit;
> + u64 n_cache_hit;
> struct u64_stats_sync syncp;
> };
>
> diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c
> index af22c9ee28dd..a5912ea05352 100644
> --- a/net/openvswitch/flow_table.c
> +++ b/net/openvswitch/flow_table.c
> @@ -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,
> diff --git a/net/openvswitch/flow_table.h b/net/openvswitch/flow_table.h
> index 1f664b050e3b..325e939371d8 100644
> --- a/net/openvswitch/flow_table.h
> +++ b/net/openvswitch/flow_table.h
> @@ -82,7 +82,8 @@ struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *table,
> struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *,
> const struct sw_flow_key *,
> u32 skb_hash,
> - u32 *n_mask_hit);
> + u32 *n_mask_hit,
> + u32 *n_cache_hit);
> struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *,
> const struct sw_flow_key *);
> struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,
>
> _______________________________________________
> dev mailing list
> dev@...nvswitch.org
> https://mail.openvswitch.org/mailman/listinfo/ovs-dev
--
Best regards, Tonghao
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