netdev - Re: [net-next sample action optimization v2 4/4] Openvswitch: Refactor sample and recirc actions implementation

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Date:   Thu, 16 Mar 2017 12:24:20 -0700
From:   Pravin Shelar <pshelar@....org>
To:     Andy Zhou <azhou@....org>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Joe Stringer <joe@....org>
Subject: Re: [net-next sample action optimization v2 4/4] Openvswitch:
 Refactor sample and recirc actions implementation

On Tue, Mar 14, 2017 at 4:08 PM, Andy Zhou <azhou@....org> wrote:
> Added execute_or_defer_actions() that both sample and recirc
> action's implementation can use.
>
> Signed-off-by: Andy Zhou <azhou@....org>
> ---
>  net/openvswitch/actions.c | 96 +++++++++++++++++++++++++++++------------------
>  1 file changed, 59 insertions(+), 37 deletions(-)
>
> diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
> index 1638370..fd7d903 100644
> --- a/net/openvswitch/actions.c
> +++ b/net/openvswitch/actions.c
...

> @@ -1286,6 +1262,52 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
>         return 0;
>  }
>
> +static int execute_or_defer_actions(struct datapath *dp, struct sk_buff *skb,
> +                                   struct sw_flow_key *clone,
> +                                   struct sw_flow_key *key,
> +                                   u32 *recirc_id,
> +                                   const struct nlattr *actions, int len)
> +{
> +       struct deferred_action *da;
> +
> +       /* If within the limit of 'OVS_DEFERRED_ACTION_THRESHOLD',
> +        * recirc immediately, otherwise, defer it for later execution.
> +        */
> +       if (clone) {
> +               if (recirc_id) {
> +                       clone->recirc_id = *recirc_id;
> +                       ovs_dp_process_packet(skb, clone);
> +                       return 0;
> +               } else {
> +                       return do_execute_actions(dp, skb, clone,
> +                                                 actions, len);

the exec_actions_level inc and dec should be moved here, since it is
only needed around this function.