[ovs-dev,net-next,v6,07/10] net: openvswitch: add likely in flow_lookup
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Message ID 1572618234-6904-8-git-send-email-xiangxia.m.yue@gmail.com
State New
Headers show
Series
  • optimize openvswitch flow looking up
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Commit Message

Tonghao Zhang Nov. 1, 2019, 2:23 p.m. UTC
From: Tonghao Zhang <xiangxia.m.yue@gmail.com>

The most case *index < ma->max, and flow-mask is not NULL.
We add un/likely for performance.

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Tested-by: Greg Rose <gvrose8192@gmail.com>
Acked-by: William Tu <u9012063@gmail.com>
---
 net/openvswitch/flow_table.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Pravin Shelar Nov. 3, 2019, 6:47 a.m. UTC | #1
On Fri, Nov 1, 2019 at 7:24 AM <xiangxia.m.yue@gmail.com> wrote:
>
> From: Tonghao Zhang <xiangxia.m.yue@gmail.com>
>
> The most case *index < ma->max, and flow-mask is not NULL.
> We add un/likely for performance.
>
> Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
> Tested-by: Greg Rose <gvrose8192@gmail.com>
> Acked-by: William Tu <u9012063@gmail.com>
> ---
Acked-by: Pravin B Shelar <pshelar@ovn.org>

Patch
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diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c
index 96757e2..9f5a06e 100644
--- a/net/openvswitch/flow_table.c
+++ b/net/openvswitch/flow_table.c
@@ -519,7 +519,7 @@  static struct sw_flow *flow_lookup(struct flow_table *tbl,
 	struct sw_flow_mask *mask;
 	int i;
 
-	if (*index < ma->max) {
+	if (likely(*index < ma->max)) {
 		mask = rcu_dereference_ovsl(ma->masks[*index]);
 		if (mask) {
 			flow = masked_flow_lookup(ti, key, mask, n_mask_hit);
@@ -534,7 +534,7 @@  static struct sw_flow *flow_lookup(struct flow_table *tbl,
 			continue;
 
 		mask = rcu_dereference_ovsl(ma->masks[i]);
-		if (!mask)
+		if (unlikely(!mask))
 			break;
 
 		flow = masked_flow_lookup(ti, key, mask, n_mask_hit);