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ovs: propagate per dp max headroom to all vports
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:
parent
45493d47c3
commit
3a927bc7cf
3 changed files with 53 additions and 1 deletions
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@ -1908,6 +1908,29 @@ static struct vport *lookup_vport(struct net *net,
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return ERR_PTR(-EINVAL);
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}
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/* Called with ovs_mutex */
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static void update_headroom(struct datapath *dp)
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{
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unsigned dev_headroom, max_headroom = 0;
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struct net_device *dev;
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struct vport *vport;
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int i;
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for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
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hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
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dev = vport->dev;
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dev_headroom = netdev_get_fwd_headroom(dev);
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if (dev_headroom > max_headroom)
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max_headroom = dev_headroom;
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}
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}
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dp->max_headroom = max_headroom;
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for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
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hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
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netdev_set_rx_headroom(vport->dev, max_headroom);
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}
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static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
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{
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struct nlattr **a = info->attrs;
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@ -1973,6 +1996,12 @@ static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
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err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
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info->snd_seq, 0, OVS_VPORT_CMD_NEW);
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if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
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update_headroom(dp);
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else
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netdev_set_rx_headroom(vport->dev, dp->max_headroom);
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BUG_ON(err < 0);
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ovs_unlock();
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@ -2039,8 +2068,10 @@ static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
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static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
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{
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bool must_update_headroom = false;
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struct nlattr **a = info->attrs;
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struct sk_buff *reply;
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struct datapath *dp;
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struct vport *vport;
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int err;
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@ -2062,7 +2093,16 @@ static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
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err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
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info->snd_seq, 0, OVS_VPORT_CMD_DEL);
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BUG_ON(err < 0);
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/* the vport deletion may trigger dp headroom update */
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dp = vport->dp;
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if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
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must_update_headroom = true;
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netdev_reset_rx_headroom(vport->dev);
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ovs_dp_detach_port(vport);
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if (must_update_headroom)
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update_headroom(dp);
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ovs_unlock();
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ovs_notify(&dp_vport_genl_family, reply, info);
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@ -68,6 +68,8 @@ struct dp_stats_percpu {
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* ovs_mutex and RCU.
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* @stats_percpu: Per-CPU datapath statistics.
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* @net: Reference to net namespace.
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* @max_headroom: the maximum headroom of all vports in this datapath; it will
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* be used by all the internal vports in this dp.
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*
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* Context: See the comment on locking at the top of datapath.c for additional
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* locking information.
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@ -89,6 +91,8 @@ struct datapath {
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possible_net_t net;
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u32 user_features;
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u32 max_headroom;
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};
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/**
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@ -138,6 +138,11 @@ internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
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return stats;
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}
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void internal_set_rx_headroom(struct net_device *dev, int new_hr)
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{
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dev->needed_headroom = new_hr;
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}
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static const struct net_device_ops internal_dev_netdev_ops = {
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.ndo_open = internal_dev_open,
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.ndo_stop = internal_dev_stop,
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@ -145,6 +150,7 @@ static const struct net_device_ops internal_dev_netdev_ops = {
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.ndo_set_mac_address = eth_mac_addr,
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.ndo_change_mtu = internal_dev_change_mtu,
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.ndo_get_stats64 = internal_get_stats,
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.ndo_set_rx_headroom = internal_set_rx_headroom,
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};
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static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
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@ -158,7 +164,8 @@ static void do_setup(struct net_device *netdev)
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netdev->netdev_ops = &internal_dev_netdev_ops;
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netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
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netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH;
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netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
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IFF_PHONY_HEADROOM;
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netdev->destructor = internal_dev_destructor;
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netdev->ethtool_ops = &internal_dev_ethtool_ops;
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netdev->rtnl_link_ops = &internal_dev_link_ops;
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@ -199,6 +206,7 @@ static struct vport *internal_dev_create(const struct vport_parms *parms)
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err = -ENOMEM;
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goto error_free_netdev;
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}
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vport->dev->needed_headroom = vport->dp->max_headroom;
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dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
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internal_dev = internal_dev_priv(vport->dev);
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