netdev - Re: [patch net-next 3/6] net: add netif_is_ovs_master helper with IFF

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Date:	Wed, 26 Aug 2015 10:43:18 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Ido Schimmel <idosch@...lanox.com>, eladr@...lanox.com,
	"simon.horman@...ronome.com" <simon.horman@...ronome.com>,
	Jiri Pirko <jiri@...lanox.com>
Subject: Re: [patch net-next 3/6] net: add netif_is_ovs_master helper with
 IFF_OPENVSWITCH private flag

On Wed, Aug 26, 2015 at 9:36 AM, Jiri Pirko <jiri@...nulli.us> wrote:
> From: Jiri Pirko <jiri@...lanox.com>
>
> Add this helper so code can easily figure out if netdev is openswitch.
>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---
>  include/linux/netdevice.h            | 8 ++++++++
>  net/openvswitch/vport-internal_dev.c | 2 +-
>  2 files changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index be625f4..0a884e6 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -1264,6 +1264,7 @@ struct net_device_ops {
>   * @IFF_MACVLAN: Macvlan device
>   * @IFF_VRF_MASTER: device is a VRF master
>   * @IFF_NO_QUEUE: device can run without qdisc attached
> + * @IFF_VRF_OPENVSWITCH: device is a Open vSwitch master
>   */
>  enum netdev_priv_flags {
>         IFF_802_1Q_VLAN                 = 1<<0,
> @@ -1293,6 +1294,7 @@ enum netdev_priv_flags {
>         IFF_IPVLAN_SLAVE                = 1<<24,
>         IFF_VRF_MASTER                  = 1<<25,
>         IFF_NO_QUEUE                    = 1<<26,
> +       IFF_OPENVSWITCH                 = 1<<27,
>  };
>
>  #define IFF_802_1Q_VLAN                        IFF_802_1Q_VLAN
> @@ -1322,6 +1324,7 @@ enum netdev_priv_flags {
>  #define IFF_IPVLAN_SLAVE               IFF_IPVLAN_SLAVE
>  #define IFF_VRF_MASTER                 IFF_VRF_MASTER
>  #define IFF_NO_QUEUE                   IFF_NO_QUEUE
> +#define IFF_OPENVSWITCH                        IFF_OPENVSWITCH
>
>  /**
>   *     struct net_device - The DEVICE structure.
> @@ -3853,6 +3856,11 @@ static inline bool netif_is_bridge_master(const struct net_device *dev)
>         return dev->priv_flags & IFF_EBRIDGE;
>  }
>
> +static inline bool netif_is_ovs_master(const struct net_device *dev)
> +{
> +       return dev->priv_flags & IFF_OPENVSWITCH;
> +}

We're going to run out of priv_flags bits.  This flag doesn't seem
like something that will be checked lots of places.  How about using
rtnl_link_ops->kind to save a bit in priv_flags?

static inline bool netif_is_ovs_master(const struct net_device *dev)
{
    return !strcmp(dev->rtnl_link_ops->kind, "openvswitch"));
}

> +
>  static inline bool netif_index_is_vrf(struct net *net, int ifindex)
>  {
>         bool rc = false;
> diff --git a/net/openvswitch/vport-internal_dev.c b/net/openvswitch/vport-internal_dev.c
> index c058bbf..80b3e12 100644
> --- a/net/openvswitch/vport-internal_dev.c
> +++ b/net/openvswitch/vport-internal_dev.c
> @@ -135,7 +135,7 @@ 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;
> +       netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH;
>         netdev->destructor = internal_dev_destructor;
>         netdev->ethtool_ops = &internal_dev_ethtool_ops;
>         netdev->rtnl_link_ops = &internal_dev_link_ops;
> --
> 1.9.3
>
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