netdev - Re: [PATCH net-next 3/5] ovs: propagate per dp max headroom to all vports

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Date:	Tue, 23 Feb 2016 11:20:56 -0800
From:	pravin shelar <pshelar@....org>
To:	Paolo Abeni <pabeni@...hat.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Pravin Shelar <pshelar@...ira.com>,
	Jesse Gross <jesse@...nel.org>,
	Flavio Leitner <fbl@...close.org>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH net-next 3/5] ovs: propagate per dp max headroom to all vports

On Tue, Feb 23, 2016 at 4:53 AM, Paolo Abeni <pabeni@...hat.com> wrote:
> 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@...hat.com>
> ---
>  net/openvswitch/datapath.c           | 48 ++++++++++++++++++++++++++++++++++++
>  net/openvswitch/datapath.h           |  4 +++
>  net/openvswitch/vport-internal_dev.c | 10 +++++++-
>  3 files changed, 61 insertions(+), 1 deletion(-)
>
> diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
> index c4e8455..7b37288 100644
> --- a/net/openvswitch/datapath.c
> +++ b/net/openvswitch/datapath.c
> @@ -1908,6 +1908,34 @@ static struct vport *lookup_vport(struct net *net,
>                 return ERR_PTR(-EINVAL);
>  }
>
> +/* Called with ovs_mutex */
> +static void update_headroom(struct datapath *dp)
> +{
> +       int i;
> +       struct vport *vport;
> +       struct net_device *dev;
> +       unsigned dev_headroom, max_headroom = 0;
> +
> +       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) {
> +                       dev = vport->dev;
> +                       if (dev->netdev_ops->ndo_set_rx_headroom)
> +                               dev->netdev_ops->ndo_set_rx_headroom(dev,
> +                                                                 max_headroom);
> +               }
> +       }
> +}
> +
Code looks fine. But It could be kept in sync with bridge code from patch 2.