From: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
To: Ori Kam <orika@nvidia.com>,
"NBU-Contact-Thomas Monjalon (EXTERNAL)" <thomas@monjalon.net>,
Ferruh Yigit <ferruh.yigit@amd.com>
Cc: Rongwei Liu <rongweil@nvidia.com>, Matan Azrad <matan@nvidia.com>,
Slava Ovsiienko <viacheslavo@nvidia.com>,
Aman Singh <aman.deep.singh@intel.com>,
Yuying Zhang <yuying.zhang@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>,
Raslan Darawsheh <rasland@nvidia.com>,
"jerinj@marvell.com" <jerinj@marvell.com>
Subject: Re: [PATCH v7] ethdev: add special flags when creating async transfer table
Date: Wed, 1 Feb 2023 14:29:29 +0300 [thread overview]
Message-ID: <e4ee9951-4b20-9b8f-2d6e-27fce1cfa8f2@oktetlabs.ru> (raw)
In-Reply-To: <MW2PR12MB4666401236BCDB08941553B2D6D19@MW2PR12MB4666.namprd12.prod.outlook.com>
On 2/1/23 14:22, Ori Kam wrote:
> Hi
>
> Please also see my previous mail.
>
>> -----Original Message-----
>> From: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
>> Sent: Wednesday, 1 February 2023 13:11
>>
>> On 2/1/23 13:58, Thomas Monjalon wrote:
>>> 01/02/2023 11:17, Andrew Rybchenko:
>>>> On 1/18/23 19:18, Thomas Monjalon wrote:
>>>>> 18/01/2023 08:28, Andrew Rybchenko:
>>>>>> On 11/14/22 14:59, Rongwei Liu wrote:
>>>>>>> In case flow rules match only one kind of traffic in a flow table,
>>>>>>> then optimization can be done via allocation of this table.
>>>>>>> Such optimization is possible only if the application gives a hint
>>>>>>> about its usage of the table during initial configuration.
>>>>>>>
>>>>>>> The transfer domain rules may process traffic from wire or vport,
>>>>>>> which may correspond to two kinds of underlayer resources.
>>>>>>> That's why the first two hints introduced in this patch are about
>>>>>>> wire and vport traffic specialization.
>>>>>>> Wire means traffic arrives from the uplink port while vport means
>>>>>>> traffic initiated from VF/SF.
>>>>>>>
>>>>>>> There are two possible approaches for providing the hints.
>>>>>>> Using IPv4 as an example:
>>>>>>> 1. Use pattern item in both template table and flow rules.
>>>>>>>
>>>>>>> pattern_template: pattern ANY_VPORT / eth / ipv4 is 1.1.1.1 / end
>>>>>>> async flow create: pattern ANY_VPORT / eth / ipv4 is 1.1.1.2 / end
>>>>>>>
>>>>>>> "ANY_VPORT" needs to be present in each flow rule even if it's
>>>>>>> just a hint. No value to match because matching is already done by
>>>>>>> IPv4 item.
>>>>>>>
>>>>>>> 2. Add special flags into table_attr.
>>>>>>>
>>>>>>> template_table 0 create table_id 0 group 1 transfer vport_orig
>>>>>>>
>>>>>>> Approach 1 needs to specify the pattern in each flow rule which
>> wastes
>>>>>>> memory and is not user friendly.
>>>>>>> This patch takes the 2nd approach and introduces one new member
>>>>>>> "specialize" into rte_flow_table_attr to indicate possible flow table
>>>>>>> optimization.
>>>>>>
>>>>>> The above description is misleading. It alternates options (1)
>>>>>> and (2), but in fact (2) requires (1) as well.
>>>>>
>>>>> Yes the above description may be misleading
>>>>> and it seems you are misleaded :)
>>>>
>>>> It is not my intention. If it is only my problem, I'm OK to
>>>> step back.
>>>
>>> It's OK to explain and check everything is OK, no worries.
>>> Thanks for reviewing.
>>>
>>>>> I will explain below why the option (2) doesn't require (1).
>>>>> I think we should apply the same example to both cases to make it clear:
>>>>>
>>>>> 1. Use pattern item in both template table and flow rules:
>>>>>
>>>>> template table 3 = transfer pattern ANY_VPORT / eth / ipv4 src is
>> 255.255.255.255 / end
>>>>> flow rule = template_table 3 pattern ANY_VPORT / eth / ipv4 src is
>> 1.1.1.1 / end
>>>>>
>>>>> The pattern template 3 will be used only to match flows coming from
>> vports.
>>>>> ANY_VPORT needs to be present in each flow rule.
>>>>
>>>> It looks like I lost something here. Why do we need to specify
>>>> it in each flow rule if the matching is already fixed in
>>>> template table?
>>>
>>> I think that's how template tables are designed.
>>> Ori, please could you point us to the relevant documentation?
>>>
>>>>> ANY_VPORT matching is redundant with IP src 1.1.1.1 because
>>>>> the user knows 1.1.1.1 is the IP of a vport.
>>>>
>>>> What should happen if a packet with src IP 1.1.1.1 comes from
>>>> the wire? Almost anything could come from network.
>>>
>>> It a packet comes from a wired port AND
>>> the PMD did an optimization based on this hint,
>>> then the packet could be not matched.
>>
>> So, the hint changes matching results and therefore becomes
>> a strange (extra) matching criteria under specific
>> circumstance. It sounds bad. So, good application must use
>> real (always) matching criteria when composing flow rules.
>> So, RTE flow API should provide a way to write a good
>> application without extra pain.
>> That's why I'm saying that (2) requires (1) anyway.
>>
>
> I'm sorry I don't see why.
Will be in reply to Thomas
>
> This feature is about where to place the rule in the HW.
> This feature can be useful for any HW that as different pipelines for ingress
> and egress traffic. It can be used to save resources or if some actions can be done
> only on one direction then the PMD can allow them and not block the this rule.
>
>
>> It does not say that hint is not required at all.
>> It is still useful for resources usage optimization if
>> application knows how it is going to use particular table.
>>
>
> So we agree that the hint is good?
Acceptable since we need to optimize resources.
It would be better without it, but we need it.
next prev parent reply other threads:[~2023-02-01 11:29 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-07 2:40 [PATCH v1] ethdev: add direction info when creating the " Rongwei Liu
2022-09-11 8:22 ` Ori Kam
2022-09-12 16:57 ` Ivan Malov
2022-09-13 13:46 ` Rongwei Liu
2022-09-13 14:33 ` Ivan Malov
2022-09-14 5:16 ` Rongwei Liu
2022-09-14 7:32 ` Ivan Malov
2022-09-14 10:17 ` Rongwei Liu
2022-09-14 15:18 ` Ivan Malov
2022-09-14 21:02 ` Thomas Monjalon
2022-09-15 0:58 ` Rongwei Liu
2022-09-15 7:47 ` Ivan Malov
2022-09-15 8:18 ` Thomas Monjalon
2022-09-15 9:42 ` Ivan Malov
2022-09-15 8:48 ` Rongwei Liu
2022-09-15 10:59 ` Ivan Malov
2022-09-15 11:16 ` Thomas Monjalon
2022-09-20 9:41 ` Ori Kam
2022-09-20 12:45 ` Ivan Malov
2022-09-20 13:59 ` Ori Kam
2022-09-20 15:28 ` Ivan Malov
2022-09-21 7:34 ` Ori Kam
2022-09-21 8:39 ` Andrew Rybchenko
2022-09-21 9:04 ` Ivan Malov
2022-09-21 9:40 ` Thomas Monjalon
2022-09-21 10:04 ` Andrew Rybchenko
2022-09-21 12:41 ` Ori Kam
2022-09-21 12:51 ` Morten Brørup
2022-09-22 7:39 ` Andrew Rybchenko
2022-09-22 10:06 ` Ori Kam
2022-09-22 10:31 ` Andrew Rybchenko
2022-09-22 13:00 ` Ori Kam
2022-09-23 7:25 ` Andrew Rybchenko
2022-09-23 16:11 ` Ori Kam
2022-09-22 12:43 ` Ivan Malov
2022-09-22 14:46 ` Ori Kam
2022-09-28 9:24 ` [PATCH v3] ethdev: add hint when creating async " Rongwei Liu
2022-10-04 8:31 ` Andrew Rybchenko
2022-11-04 10:42 ` [PATCH v4] ethdev: add special flags " Rongwei Liu
2022-11-04 10:44 ` Rongwei Liu
2022-11-08 11:39 ` Andrew Rybchenko
2022-11-08 11:47 ` Andrew Rybchenko
2022-11-08 13:29 ` Thomas Monjalon
2022-11-08 14:38 ` Andrew Rybchenko
2022-11-08 15:25 ` Thomas Monjalon
2022-11-09 8:53 ` Andrew Rybchenko
2022-11-09 9:03 ` Thomas Monjalon
2022-11-09 9:36 ` Andrew Rybchenko
2022-11-09 10:50 ` Thomas Monjalon
2022-11-06 10:02 ` [PATCH v3] ethdev: add hint " Andrew Rybchenko
2022-11-07 1:58 ` Rongwei Liu
2022-11-08 9:19 ` Thomas Monjalon
2022-11-08 9:35 ` Andrew Rybchenko
2022-11-08 11:18 ` Thomas Monjalon
2022-11-08 11:48 ` Andrew Rybchenko
2022-11-14 8:47 ` [PATCH v6] ethdev: add special flags " Rongwei Liu
2022-11-14 11:59 ` [PATCH v7] " Rongwei Liu
2023-01-17 15:13 ` Ferruh Yigit
2023-01-17 17:01 ` Ferruh Yigit
2023-01-18 2:50 ` Rongwei Liu
2023-01-18 7:30 ` Andrew Rybchenko
2023-01-18 7:28 ` Andrew Rybchenko
2023-01-18 16:18 ` Thomas Monjalon
2023-02-01 10:17 ` Andrew Rybchenko
2023-02-01 10:58 ` Thomas Monjalon
2023-02-01 11:10 ` Andrew Rybchenko
2023-02-01 11:18 ` Thomas Monjalon
2023-02-01 11:38 ` Andrew Rybchenko
2023-02-01 13:48 ` Thomas Monjalon
2023-02-02 9:21 ` Andrew Rybchenko
2023-02-02 11:29 ` Thomas Monjalon
2023-02-02 12:24 ` Andrew Rybchenko
2023-02-01 11:22 ` Ori Kam
2023-02-01 11:29 ` Andrew Rybchenko [this message]
2023-02-01 11:12 ` Ori Kam
2023-02-01 11:20 ` Thomas Monjalon
2023-01-30 0:00 ` Ivan Malov
2023-01-30 2:34 ` Rongwei Liu
2023-01-30 7:40 ` Ivan Malov
2023-01-30 14:49 ` Rongwei Liu
2023-01-30 23:00 ` Ivan Malov
2023-01-31 3:06 ` Rongwei Liu
2023-01-31 5:30 ` Ivan Malov
2023-01-31 6:14 ` Rongwei Liu
2023-02-01 10:12 ` Thomas Monjalon
2023-02-01 11:50 ` Ivan Malov
2023-02-01 13:37 ` Thomas Monjalon
2023-02-01 14:04 ` Ivan Malov
2023-02-01 14:23 ` Thomas Monjalon
2023-02-01 14:29 ` Ori Kam
2023-02-02 11:19 ` [PATCH v8] ethdev: add optimization hints in flow template table Rongwei Liu
2023-02-02 11:33 ` Thomas Monjalon
2023-02-08 23:19 ` Ferruh Yigit
2022-11-09 8:11 ` [PATCH v5] ethdev: add special flags when creating async transfer table Rongwei Liu
2022-11-09 8:13 ` Rongwei Liu
2022-11-09 8:31 ` Thomas Monjalon
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