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ovs: propagate per dp max headroom to all vports

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This patch implements bookkeeping support to compute the maximum
headroom for all the devices in each datapath. When said value
changes, the underlying devs are notified via the
ndo_set_rx_headroom method.

This also increases the internal vports xmit performance.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2016-02-26 10:45:39 +01:00 committed by David S. Miller
parent 45493d47c3
commit 3a927bc7cf
3 changed files with 53 additions and 1 deletions
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40
net/openvswitch/datapath.c
View File

@ -1908,6 +1908,29 @@ static struct vport *lookup_vport(struct net *net,
return ERR_PTR(-EINVAL);
}
/* Called with ovs_mutex */
static void update_headroom(struct datapath *dp)
{
unsigned dev_headroom, max_headroom = 0;
struct net_device *dev;
struct vport *vport;
int i;
for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
dev = vport->dev;
dev_headroom = netdev_get_fwd_headroom(dev);
if (dev_headroom > max_headroom)
max_headroom = dev_headroom;
}
}
dp->max_headroom = max_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);
}
static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
@ -1973,6 +1996,12 @@ restart:
err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
info->snd_seq, 0, OVS_VPORT_CMD_NEW);
if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
update_headroom(dp);
else
netdev_set_rx_headroom(vport->dev, dp->max_headroom);
BUG_ON(err < 0);
ovs_unlock();
@ -2039,8 +2068,10 @@ exit_unlock_free:
static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
{
bool must_update_headroom = false;
struct nlattr **a = info->attrs;
struct sk_buff *reply;
struct datapath *dp;
struct vport *vport;
int err;
@ -2062,7 +2093,16 @@ static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
info->snd_seq, 0, OVS_VPORT_CMD_DEL);
BUG_ON(err < 0);
/* 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;
netdev_reset_rx_headroom(vport->dev);
ovs_dp_detach_port(vport);
if (must_update_headroom)
update_headroom(dp);
ovs_unlock();
ovs_notify(&dp_vport_genl_family, reply, info);

4
net/openvswitch/datapath.h
View File

@ -68,6 +68,8 @@ struct dp_stats_percpu {
* ovs_mutex and RCU.
* @stats_percpu: Per-CPU datapath statistics.
* @net: Reference to net namespace.
* @max_headroom: the maximum headroom of all vports in this datapath; it will
* be used by all the internal vports in this dp.
*
* Context: See the comment on locking at the top of datapath.c for additional
* locking information.
@ -89,6 +91,8 @@ struct datapath {
possible_net_t net;
u32 user_features;
u32 max_headroom;
};
/**

10
net/openvswitch/vport-internal_dev.c
View File

@ -138,6 +138,11 @@ internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
return stats;
}
void internal_set_rx_headroom(struct net_device *dev, int new_hr)
{
dev->needed_headroom = new_hr;
}
static const struct net_device_ops internal_dev_netdev_ops = {
.ndo_open = internal_dev_open,
.ndo_stop = internal_dev_stop,
@ -145,6 +150,7 @@ static const struct net_device_ops internal_dev_netdev_ops = {
.ndo_set_mac_address = eth_mac_addr,
.ndo_change_mtu = internal_dev_change_mtu,
.ndo_get_stats64 = internal_get_stats,
.ndo_set_rx_headroom = internal_set_rx_headroom,
};
static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
@ -158,7 +164,8 @@ static void do_setup(struct net_device *netdev)
netdev->netdev_ops = &internal_dev_netdev_ops;
netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH;
netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
IFF_PHONY_HEADROOM;
netdev->destructor = internal_dev_destructor;
netdev->ethtool_ops = &internal_dev_ethtool_ops;
netdev->rtnl_link_ops = &internal_dev_link_ops;
@ -199,6 +206,7 @@ static struct vport *internal_dev_create(const struct vport_parms *parms)
err = -ENOMEM;
goto error_free_netdev;
}
vport->dev->needed_headroom = vport->dp->max_headroom;
dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
internal_dev = internal_dev_priv(vport->dev);