[ovs-dev] [PATCH V4 13/24] datapath: select vport upcall portid directly

Greg Rose gvrose8192 at gmail.com
Mon Oct 12 20:25:00 UTC 2020

From: Tonghao Zhang <xiangxia.m.yue at gmail.com>

Upstream commit:
    commit 90ce9f23a886bdef7a4b7a9bd52c7a50a6a81635
    Author: Tonghao Zhang <xiangxia.m.yue at gmail.com>
    Date:   Thu Nov 7 00:34:28 2019 +0800

    net: openvswitch: select vport upcall portid directly

    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

    Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
    Acked-by: Pravin B Shelar <pshelar at ovn.org>
    Signed-off-by: David S. Miller <davem at davemloft.net>

Cc: Tonghao Zhang <xiangxia.m.yue at gmail.com>
Reviewed-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
Signed-off-by: Greg Rose <gvrose8192 at gmail.com>
 datapath/vport.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/datapath/vport.c b/datapath/vport.c
index f929282dc..bd62c5612 100644
--- a/datapath/vport.c
+++ b/datapath/vport.c
@@ -507,8 +507,9 @@ 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);

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