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From: Eli Britstein <elibr@nvidia.com>
To: Ivan Malov <Ivan.Malov@oktetlabs.ru>,
	Thomas Monjalon <thomas@monjalon.net>,
	Gregory Etelson <getelson@nvidia.com>
Cc: <dev@dpdk.org>, <matan@nvidia.com>, <rasland@nvidia.com>,
	<ozsh@nvidia.com>, <asafp@nvidia.com>,
	Eli Britstein <elibr@mellanox.com>, Ori Kam <orika@nvidia.com>,
	Viacheslav Ovsiienko <viacheslavo@nvidia.com>,
	Ray Kinsella <mdr@ashroe.eu>, Neil Horman <nhorman@tuxdriver.com>,
	"Ferruh Yigit" <ferruh.yigit@intel.com>,
	Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Subject: Re: [dpdk-dev] [PATCH v8 2/3] ethdev: tunnel offload model
Date: Thu, 4 Mar 2021 08:35:39 +0200
Message-ID: <d1a5e3c0-0b24-ea70-af86-1c04e05034db@nvidia.com> (raw)
In-Reply-To: <4a5ec329-bd91-e9d6-7578-be4e093bffa4@oktetlabs.ru>


On 3/3/2021 4:03 PM, Ivan Malov wrote:
> Hi,
>
> Could someone please also clarify the meaning (from PMD standpoint and 
> from application's standpoint) of the 64-bit field "tun_id" in 
> "rte_flow_tunnel"? The current comment reads: "Tunnel identification", 
> which is quite ambiguous, not to mention the fact that it simply 
> expands the field's name. Does this ID have anything to do with 
> VXLAN's VNI (which is 24-bit field)?

rte_flow_tunnel struct is the tunnel details communicated between the 
application and PMD when applying flows, and from the PMD to the 
application upon miss.

The fields in it are porting of the kernel's 'struct ip_tunnel_key'. See 
https://elixir.bootlin.com/linux/latest/source/include/net/ip_tunnels.h#L40

Regarding 'tun_id' - yes. In case of VXLAN tunnel it stores the VNI.

>
> As far as I can learn from the testpmd patch series, this field gets 
> printed only if it's non-zero. Hmm. A special value of sorts? Maybe 
> clarify this, too?
>
> Thank you.
>
> On 02/03/2021 12:42, Thomas Monjalon wrote:
>> 02/03/2021 10:22, Ivan Malov:
>>> Hi Gregory, Eli,
>>>
>>> On 16/10/2020 15:51, Gregory Etelson wrote:
>>>   > Applications wishing to offload tunneled traffic are required to 
>>> use
>>>   > the rte_flow primitives, such as group, meta, mark, tag, and 
>>> others to
>>>   > model their high-level objects.  The hardware model design for
>>>
>>> As far as I understand, the model is an abstraction of sorts, and the
>>> quoted lines provide examples of primitives which applications would
>>> have to use if the model did not exist.
>>>
>>> Looking at the implementation, I don't quite discern any means to let
>>> the application query PMD-specific values of "rte_flow_attr". In
>>> example, the PMD may need to enforce "transfer=1" both for the "tunnel
>>> set" rule and for "tunnel match" one. What if "group" and "priority"
>>> values also need to be implicitly controlled by the PMD for the tunnel
>>> offload rules?
>>>
>>> Have you considered adding an abstraction for "rte_flow_attr" in terms
>>> of this model?
>>>
>>>   > The first VXLAN packet that arrives matches the rule in group 0 and
>>>   > jumps to group 3.  In group 3 the packet will miss since there 
>>> is no
>>>
>>> This example considers jumping from group 0 to group 3. First of all,
>>> it's unclear whether this model intentionally lets the application
>>> choose group values freely (see my question above) or simply lacks an
>>> interface to let the application use values enforced by the PMD (if
>>> any). Secondly, given the fact that existing description of
>>> "rte_flow_attr" does not shed any light on how groups are ordered by
>>> default, when no JUMPs are configured (it only explains how priority
>>> levels are ordered within the given group but not how groups are
>>> ordered), it's unclear whether the model intentionally permits the
>>> application to jump between arbitrary groups (in example, from 0 to 3)
>>> and not necessarily between, say, 0 to 1. More to that, it's unclear
>>> whether the model lets the application jump from, say, group 0 to the
>>> very same group, 0 ("recirculation") or not. Or is the "recirculation"
>>> is in fact the main scenario in the model? Could you please 
>>> elaborate on
>>> the model's expectations of groups?
>>>
>>> Thank you.
>>
>> Given the questions, I think the discussion should be concluded
>> (when done) with a patch updating the API description.
>> Thanks for the questions and clarifications to come :)
>>
>>
>>
>

  reply	other threads:[~2021-03-04  6:36 UTC|newest]

Thread overview: 95+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-25 16:03 [dpdk-dev] [PATCH 0/2] " Gregory Etelson
2020-06-25 16:03 ` [dpdk-dev] [PATCH 1/2] ethdev: allow negative values in flow rule types Gregory Etelson
2020-07-05 13:34   ` Andrew Rybchenko
2020-08-19 14:33     ` Gregory Etelson
2020-06-25 16:03 ` [dpdk-dev] [PATCH 2/2] ethdev: tunnel offload model Gregory Etelson
     [not found]   ` <DB8PR05MB6761ED02BCD188771BDCDE64A86F0@DB8PR05MB6761.eurprd05.prod.outlook.com>
     [not found]     ` <38d3513f-1261-0fbc-7c56-f83ced61f97a@ashroe.eu>
2020-07-01  6:52       ` Gregory Etelson
2020-07-13  8:21         ` Thomas Monjalon
2020-07-13 13:23           ` Gregory Etelson
2020-07-05 14:50   ` Andrew Rybchenko
2020-08-19 14:30     ` Gregory Etelson
2020-07-05 13:39 ` [dpdk-dev] [PATCH 0/2] " Andrew Rybchenko
2020-09-08 20:15 ` [dpdk-dev] [PATCH v2 0/4] Tunnel Offload API Gregory Etelson
2020-09-08 20:15   ` [dpdk-dev] [PATCH v2 1/4] ethdev: allow negative values in flow rule types Gregory Etelson
2020-09-15  4:36     ` Ajit Khaparde
2020-09-15  8:46       ` Andrew Rybchenko
2020-09-15 10:27         ` Gregory Etelson
2020-09-16 17:21           ` Gregory Etelson
2020-09-17  6:49             ` Andrew Rybchenko
2020-09-17  7:47               ` Ori Kam
2020-09-17 15:15                 ` Andrew Rybchenko
2020-09-17  7:56               ` Gregory Etelson
2020-09-17 15:18                 ` Andrew Rybchenko
2020-09-15  8:45     ` Andrew Rybchenko
2020-09-15 16:17       ` Gregory Etelson
2020-09-08 20:15   ` [dpdk-dev] [PATCH v2 2/4] ethdev: tunnel offload model Gregory Etelson
2020-09-08 20:15   ` [dpdk-dev] [PATCH v2 3/4] net/mlx5: implement tunnel offload API Gregory Etelson
2020-09-08 20:15   ` [dpdk-dev] [PATCH v2 4/4] app/testpmd: support " Gregory Etelson
2020-09-15  4:47     ` Ajit Khaparde
2020-09-15 10:44       ` Gregory Etelson
2020-09-30  9:18 ` [dpdk-dev] [PATCH v3 0/4] Tunnel Offload API Gregory Etelson
2020-09-30  9:18   ` [dpdk-dev] [PATCH v3 1/4] ethdev: allow negative values in flow rule types Gregory Etelson
2020-10-04  5:40     ` Ajit Khaparde
2020-10-04  9:24       ` Gregory Etelson
2020-09-30  9:18   ` [dpdk-dev] [PATCH v3 2/4] ethdev: tunnel offload model Gregory Etelson
2020-09-30  9:18   ` [dpdk-dev] [PATCH v3 3/4] net/mlx5: implement tunnel offload API Gregory Etelson
2020-09-30  9:18   ` [dpdk-dev] [PATCH v3 4/4] app/testpmd: add commands for " Gregory Etelson
2020-10-01  5:32     ` Ajit Khaparde
2020-10-01  9:05       ` Gregory Etelson
2020-10-04  5:40         ` Ajit Khaparde
2020-10-04  9:29           ` Gregory Etelson
2020-10-04 13:50 ` [dpdk-dev] [PATCH v4 0/4] Tunnel Offload API Gregory Etelson
2020-10-04 13:50   ` [dpdk-dev] [PATCH v4 1/4] ethdev: allow negative values in flow rule types Gregory Etelson
2020-10-14 23:40     ` Thomas Monjalon
2020-10-04 13:50   ` [dpdk-dev] [PATCH v4 2/4] ethdev: tunnel offload model Gregory Etelson
2020-10-06  9:47     ` Sriharsha Basavapatna
2020-10-07 12:36       ` Gregory Etelson
2020-10-14 17:23         ` Ferruh Yigit
2020-10-16  9:15           ` Gregory Etelson
2020-10-14 23:55     ` Thomas Monjalon
2020-10-04 13:50   ` [dpdk-dev] [PATCH v4 3/4] net/mlx5: implement tunnel offload API Gregory Etelson
2020-10-04 13:50   ` [dpdk-dev] [PATCH v4 4/4] app/testpmd: add commands for " Gregory Etelson
2020-10-04 13:59     ` Ori Kam
2020-10-14 17:25   ` [dpdk-dev] [PATCH v4 0/4] Tunnel Offload API Ferruh Yigit
2020-10-15 12:41 ` [dpdk-dev] [PATCH v5 0/3] " Gregory Etelson
2020-10-15 12:41   ` [dpdk-dev] [PATCH v5 1/3] ethdev: allow negative values in flow rule types Gregory Etelson
2020-10-15 12:41   ` [dpdk-dev] [PATCH v5 2/3] ethdev: tunnel offload model Gregory Etelson
2020-10-15 12:41   ` [dpdk-dev] [PATCH v5 3/3] app/testpmd: add commands for tunnel offload API Gregory Etelson
2020-10-15 22:47   ` [dpdk-dev] [PATCH v5 0/3] Tunnel Offload API Ferruh Yigit
2020-10-16  8:55 ` [dpdk-dev] [PATCH v6 " Gregory Etelson
2020-10-16  8:55   ` [dpdk-dev] [PATCH v6 1/3] ethdev: allow negative values in flow rule types Gregory Etelson
2020-10-16  8:55   ` [dpdk-dev] [PATCH v6 2/3] ethdev: tunnel offload model Gregory Etelson
2020-10-16  8:55   ` [dpdk-dev] [PATCH v6 3/3] app/testpmd: add commands for tunnel offload API Gregory Etelson
2020-10-16 10:33 ` [dpdk-dev] [PATCH v7 0/3] Tunnel Offload API Gregory Etelson
2020-10-16 10:33   ` [dpdk-dev] [PATCH v7 1/3] ethdev: allow negative values in flow rule types Gregory Etelson
2020-10-16 10:33   ` [dpdk-dev] [PATCH v7 2/3] ethdev: tunnel offload model Gregory Etelson
2020-10-16 10:34   ` [dpdk-dev] [PATCH v7 3/3] app/testpmd: add commands for tunnel offload API Gregory Etelson
2020-10-16 12:10   ` [dpdk-dev] [PATCH v7 0/3] Tunnel Offload API Ferruh Yigit
2020-10-16 12:51 ` [dpdk-dev] [PATCH v8 " Gregory Etelson
2020-10-16 12:51   ` [dpdk-dev] [PATCH v8 1/3] ethdev: allow negative values in flow rule types Gregory Etelson
2020-10-16 12:51   ` [dpdk-dev] [PATCH v8 2/3] ethdev: tunnel offload model Gregory Etelson
2020-10-16 15:41     ` Kinsella, Ray
2021-03-02  9:22     ` Ivan Malov
2021-03-02  9:42       ` Thomas Monjalon
2021-03-03 14:03         ` Ivan Malov
2021-03-04  6:35           ` Eli Britstein [this message]
2021-03-08 14:01       ` Gregory Etelson
2020-10-16 12:51   ` [dpdk-dev] [PATCH v8 3/3] app/testpmd: add commands for tunnel offload API Gregory Etelson
2020-10-16 13:19   ` [dpdk-dev] [PATCH v8 0/3] Tunnel Offload API Ferruh Yigit
2020-10-16 14:20     ` Ferruh Yigit
2020-10-18 12:15 ` [dpdk-dev] [PATCH] ethdev: rename tunnel offload callbacks Gregory Etelson
2020-10-19  8:31   ` Ferruh Yigit
2020-10-19  9:56     ` Kinsella, Ray
2020-10-19 21:29       ` Thomas Monjalon
2020-10-21  9:22 ` [dpdk-dev] [PATCH] net/mlx5: implement tunnel offload API Gregory Etelson
2020-10-22 16:00 ` [dpdk-dev] [PATCH v2] " Gregory Etelson
2020-10-23 13:49 ` [dpdk-dev] [PATCH v3] " Gregory Etelson
2020-10-23 13:57 ` [dpdk-dev] [PATCH v4] " Gregory Etelson
2020-10-25 14:08 ` [dpdk-dev] [PATCH v5] " Gregory Etelson
2020-10-25 15:01   ` Raslan Darawsheh
2020-10-27 16:12 ` [dpdk-dev] [PATCH] net/mlx5: tunnel offload code cleanup Gregory Etelson
2020-10-27 16:29   ` Slava Ovsiienko
2020-10-27 17:16   ` Raslan Darawsheh
2020-10-28 12:33     ` Andrew Rybchenko
2020-10-28  4:58 ` [dpdk-dev] [PATCH] net/mlx5: fix tunnel flow destroy Gregory Etelson
2020-11-02 16:27   ` Raslan Darawsheh

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