netdev - [PATCH net-next v2] net: openvswitch: select vport upcall portid directly

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Date:   Thu,  7 Nov 2019 00:34:28 +0800
From:   xiangxia.m.yue@...il.com
To:     ee07b291@...il.com, pshelar@....org
Cc:     netdev@...r.kernel.org, dev@...nvswitch.org,
        Tonghao Zhang <xiangxia.m.yue@...il.com>
Subject: [PATCH net-next v2] net: openvswitch: select vport upcall portid directly

From: Tonghao Zhang <xiangxia.m.yue@...il.com>

The commit 69c51582ff786 ("dpif-netlink: don't allocate per
thread netlink sockets"), in Open vSwitch ovs-vswitchd, has
changed the number of allocated sockets to just one per port
by moving the socket array from a per handler structure to
a per datapath one. In the kernel datapath, a vport will have
only one socket in most case, if so select it directly in
fast-path.

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
---
v2: drectly -> directly in the commit title
---
 net/openvswitch/vport.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index 3fc38d16c456..5da9392b03d6 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -403,8 +403,9 @@ u32 ovs_vport_find_upcall_portid(const struct vport *vport, struct sk_buff *skb)
 
 	ids = rcu_dereference(vport->upcall_portids);
 
-	if (ids->n_ids == 1 && ids->ids[0] == 0)
-		return 0;
+	/* If there is only one portid, select it in the fast-path. */
+	if (ids->n_ids == 1)
+		return ids->ids[0];
 
 	hash = skb_get_hash(skb);
 	ids_index = hash - ids->n_ids * reciprocal_divide(hash, ids->rn_ids);
-- 
2.23.0