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Message-Id: <20190705160809.5202-1-ap420073@gmail.com>
Date: Sat, 6 Jul 2019 01:08:09 +0900
From: Taehee Yoo <ap420073@...il.com>
To: davem@...emloft.net, pshelar@....org, netdev@...r.kernel.org,
dev@...nvswitch.org
Cc: ap420073@...il.com
Subject: [PATCH net-next] net: openvswitch: do not update max_headroom if new headroom is equal to old headroom
When a vport is deleted, the maximum headroom size would be changed.
If the vport which has the largest headroom is deleted,
the new max_headroom would be set.
But, if the new headroom size is equal to the old headroom size,
updating routine is unnecessary.
Signed-off-by: Taehee Yoo <ap420073@...il.com>
---
net/openvswitch/datapath.c | 39 +++++++++++++++++++++++++++-----------
1 file changed, 28 insertions(+), 11 deletions(-)
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index 33b388103741..892287d06c17 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -1958,10 +1958,9 @@ static struct vport *lookup_vport(struct net *net,
}
-/* Called with ovs_mutex */
-static void update_headroom(struct datapath *dp)
+static unsigned int ovs_get_max_headroom(struct datapath *dp)
{
- unsigned dev_headroom, max_headroom = 0;
+ unsigned int dev_headroom, max_headroom = 0;
struct net_device *dev;
struct vport *vport;
int i;
@@ -1975,10 +1974,19 @@ static void update_headroom(struct datapath *dp)
}
}
- dp->max_headroom = max_headroom;
+ return max_headroom;
+}
+
+/* Called with ovs_mutex */
+static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
+{
+ struct vport *vport;
+ int i;
+
+ dp->max_headroom = new_headroom;
for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
- netdev_set_rx_headroom(vport->dev, max_headroom);
+ netdev_set_rx_headroom(vport->dev, new_headroom);
}
static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
@@ -1989,6 +1997,7 @@ static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
struct sk_buff *reply;
struct vport *vport;
struct datapath *dp;
+ unsigned int new_headroom;
u32 port_no;
int err;
@@ -2050,8 +2059,10 @@ static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
info->snd_portid, info->snd_seq, 0,
OVS_VPORT_CMD_NEW);
- if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
- update_headroom(dp);
+ new_headroom = netdev_get_fwd_headroom(vport->dev);
+
+ if (new_headroom > dp->max_headroom)
+ ovs_update_headroom(dp, new_headroom);
else
netdev_set_rx_headroom(vport->dev, dp->max_headroom);
@@ -2122,11 +2133,12 @@ static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
{
- bool must_update_headroom = false;
+ bool update_headroom = false;
struct nlattr **a = info->attrs;
struct sk_buff *reply;
struct datapath *dp;
struct vport *vport;
+ unsigned int new_headroom;
int err;
reply = ovs_vport_cmd_alloc_info();
@@ -2152,12 +2164,17 @@ static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
/* the vport deletion may trigger dp headroom update */
dp = vport->dp;
if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
- must_update_headroom = true;
+ update_headroom = true;
+
netdev_reset_rx_headroom(vport->dev);
ovs_dp_detach_port(vport);
- if (must_update_headroom)
- update_headroom(dp);
+ if (update_headroom) {
+ new_headroom = ovs_get_max_headroom(dp);
+
+ if (new_headroom < dp->max_headroom)
+ ovs_update_headroom(dp, new_headroom);
+ }
ovs_unlock();
ovs_notify(&dp_vport_genl_family, reply, info);
--
2.17.1
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