From: Alex Rosenbaum <rosenbaumalex@gmail.com>
To: "Zhang, Qi Z" <qi.z.zhang@intel.com>
Cc: "adrien.mazarguil@6wind.com" <adrien.mazarguil@6wind.com>,
DPDK <dev@dpdk.org>, "Doherty, Declan" <declan.doherty@intel.com>
Subject: Re: [dpdk-dev] [RFC v2 3/5] ether: Add flow timeout support
Date: Sat, 23 Dec 2017 00:26:33 +0200 [thread overview]
Message-ID: <CAFgAxU_xig-ZUfmHpz4sFdsbk6c1wP3CBX2YTVAFgcDw_R8s3A@mail.gmail.com> (raw)
In-Reply-To: <039ED4275CED7440929022BC67E7061153124111@SHSMSX103.ccr.corp.intel.com>
On Fri, Dec 22, 2017 at 11:03 AM, Zhang, Qi Z <qi.z.zhang@intel.com> wrote:
>> On Thu, Dec 21, 2017 at 4:35 AM, Qi Zhang <qi.z.zhang@intel.com> wrote:
>> > Add new APIs to support flow timeout, application is able to 1. Setup
>> > the time duration of a flow, the flow is expected to be deleted
>> > automatically when timeout.
>>
>> Can you explain how the application (OVS) is expected to use this API?
>> It will help to better understand the motivation here...
>
> I think the purpose of the APIs is to expose the hardware feature that support
> flow auto delete with a timeout.
> As I know, for OVS, every flow in flow table will have time duration
> A flow be offloaded to hardware is still required to be deleted in specific time,
> I think these APIs help OVS to take advantage HW feature and simplify the flow
> aging management
Are you sure this will allow OVS to 'fire-and-forget' about the rule removal?
or will OVS anyway do rule cleanup from application tables?
Do you know if OVS flow timers are (or can be) re-armed in different
use cases? e.g. extending the timeout duration if traffic is still
flowing?
>> Are you trying to move the aging timer from application code into the PMD?
>> or can your HW remove/disable/inactivate a flow at certain time semantics
>> without software context?
>
> Yes, it for hardware feature.
So if the hardware auto removes the hardware steering entry, what
software part deletes the rte_flow handle?
What software part triggers the application callback? from what
context? will locks be required?
How do you prevent races between application thread and the context
deleting/accessing the rte_flow handle?
I mean in cases that application wants to delete the flow before the
timeout expires, but actually it is same time hardware deletes it.
Alex
next prev parent reply other threads:[~2017-12-22 22:26 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-21 2:35 [dpdk-dev] [RFC v2 0/5] rte_flow extension for vSwitch acceleration Qi Zhang
2017-12-21 2:35 ` [dpdk-dev] [RFC v2 1/5] ether: add flow action to redirect packet in a switch domain Qi Zhang
2017-12-21 12:37 ` Alex Rosenbaum
2017-12-22 8:20 ` Zhang, Qi Z
2017-12-22 22:10 ` Alex Rosenbaum
2017-12-21 2:35 ` [dpdk-dev] [RFC v2 2/5] ether: add flow last hit query support Qi Zhang
2017-12-21 2:35 ` [dpdk-dev] [RFC v2 3/5] ether: Add flow timeout support Qi Zhang
2017-12-21 13:59 ` Alex Rosenbaum
2017-12-22 9:03 ` Zhang, Qi Z
2017-12-22 14:06 ` Wiles, Keith
2018-01-14 2:03 ` Zhang, Qi Z
2017-12-22 22:26 ` Alex Rosenbaum [this message]
2017-12-26 3:28 ` Zhang, Qi Z
2017-12-26 7:44 ` Alex Rosenbaum
2017-12-21 2:35 ` [dpdk-dev] [RFC v2 4/5] ether: add more protocol support in rte_flow Qi Zhang
2017-12-21 2:35 ` [dpdk-dev] [RFC v2 5/5] ether: add packet modification aciton " Qi Zhang
2017-12-21 13:01 ` [dpdk-dev] [RFC v2 0/5] rte_flow extension for vSwitch acceleration Alex Rosenbaum
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