netdev - Re: [PATCH net-next] openvswitch: include datapath actions with sampled-packet upcall to userspace

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Date:	Wed, 27 May 2015 21:16:19 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	Pravin Shelar <pshelar@...ira.com>
Cc:	Neil McKee <neil.mckee@...on.com>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] openvswitch: include datapath actions with
 sampled-packet upcall to userspace

On Wed, May 27, 2015 at 7:46 PM, Pravin Shelar <pshelar@...ira.com> wrote:
> On Wed, May 27, 2015 at 2:10 PM, Jesse Gross <jesse@...ira.com> wrote:
>> On Fri, May 22, 2015 at 10:53 AM, Pravin Shelar <pshelar@...ira.com> wrote:
>>> On Wed, May 20, 2015 at 12:32 PM, Neil McKee <neil.mckee@...on.com> wrote:
>>>> diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
>>>> index b491c1c..ee5760d 100644
>>>> --- a/net/openvswitch/actions.c
>>>> +++ b/net/openvswitch/actions.c
>>>> @@ -608,7 +608,8 @@ static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port)
>>>>  }
>>>>
>>>>  static int output_userspace(struct datapath *dp, struct sk_buff *skb,
>>>> -                           struct sw_flow_key *key, const struct nlattr *attr)
>>>> +                           struct sw_flow_key *key, const struct nlattr *attr,
>>>> +                           const struct nlattr *actions, int actions_len)
>>>>  {
>>>>         struct ovs_tunnel_info info;
>>>>         struct dp_upcall_info upcall;
>>>> @@ -619,6 +620,8 @@ static int output_userspace(struct datapath *dp, struct sk_buff *skb,
>>>>         upcall.userdata = NULL;
>>>>         upcall.portid = 0;
>>>>         upcall.egress_tun_info = NULL;
>>>> +       upcall.actions = actions;
>>>> +       upcall.actions_len = actions_len;
>>>>
>>> Rather than unconditionally passing actions to the upcall, there
>>> should be attribute in ovs_userspace_attr to request the actions list.
>>
>> Why? It seems simpler to just always pass the actions and I'm not sure
>> that this is really performance critical (which is the only reason
>> that comes to mind to not always pass this).
>
> This is only required for sFlow sampling so I do not think we should
> send it on every upcall.

But what is the downside?
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