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net: openvswitch: do not update max_headroom if new headroom is equal to old headroom

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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@gmail.com>
Tested-by: Greg Rose <gvrose8192@gmail.com>
Reviewed-by: Greg Rose <gvrose8192@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Taehee Yoo 2019-07-06 01:08:09 +09:00 committed by David S. Miller
parent 9db7e618fc
commit 6b660c4177
1 changed files with 28 additions and 11 deletions
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39
net/openvswitch/datapath.c
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@ -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 @@ restart:
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 @@ exit_unlock_free:
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);