From: Yongseok Koh <yskoh@mellanox.com>
To: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Cc: Shahaf Shuler <shahafs@mellanox.com>,
Thomas Monjalon <thomas@monjalon.net>,
Ferruh Yigit <ferruh.yigit@intel.com>,
Andrew Rybchenko <arybchenko@solarflare.com>,
Olivier Matz <olivier.matz@6wind.com>, dev <dev@dpdk.org>,
Slava Ovsiienko <viacheslavo@mellanox.com>
Subject: Re: [dpdk-dev] [PATCH] ethdev: add flow tag
Date: Mon, 8 Jul 2019 23:32:46 +0000 [thread overview]
Message-ID: <83967DD4-0292-4078-8E33-63BEEA186390@mellanox.com> (raw)
In-Reply-To: <6EE319CD-4BBC-47BF-AAE5-2165B8C1D491@mellanox.com>
> On Jul 5, 2019, at 11:05 AM, Yongseok Koh <yskoh@mellanox.com> wrote:
>
>
>
>> On Jul 5, 2019, at 6:54 AM, Adrien Mazarguil <adrien.mazarguil@6wind.com> wrote:
>>
>> On Thu, Jul 04, 2019 at 04:23:02PM -0700, Yongseok Koh wrote:
>>> A tag is a transient data which can be used during flow match. This can be
>>> used to store match result from a previous table so that the same pattern
>>> need not be matched again on the next table. Even if outer header is
>>> decapsulated on the previous match, the match result can be kept.
>>>
>>> Some device expose internal registers of its flow processing pipeline and
>>> those registers are quite useful for stateful connection tracking as it
>>> keeps status of flow matching. Multiple tags are supported by specifying
>>> index.
>>>
>>> Example testpmd commands are:
>>>
>>> flow create 0 ingress pattern ... / end
>>> actions set_tag index 2 value 0xaa00bb mask 0xffff00ff /
>>> set_tag index 3 value 0x123456 mask 0xffffff /
>>> vxlan_decap / jump group 1 / end
>>>
>>> flow create 0 ingress pattern ... / end
>>> actions set_tag index 2 value 0xcc00 mask 0xff00 /
>>> set_tag index 3 value 0x123456 mask 0xffffff /
>>> vxlan_decap / jump group 1 / end
>>>
>>> flow create 0 ingress group 1
>>> pattern tag index is 2 value spec 0xaa00bb value mask 0xffff00ff /
>>> eth ... / end
>>> actions ... jump group 2 / end
>>>
>>> flow create 0 ingress group 1
>>> pattern tag index is 2 value spec 0xcc00 value mask 0xff00 /
>>> tag index is 3 value spec 0x123456 value mask 0xffffff /
>>> eth ... / end
>>> actions ... / end
>>>
>>> flow create 0 ingress group 2
>>> pattern tag index is 3 value spec 0x123456 value mask 0xffffff /
>>> eth ... / end
>>> actions ... / end
>>>
>>> Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
>>
>> Hi Yongseok,
>>
>> Only high level questions for now, while it unquestionably looks useful,
>> from a user standpoint exposing the separate index seems redundant and not
>> necessarily convenient. Using the following example to illustrate:
>>
>> actions set_tag index 3 value 0x123456 mask 0xfffff
>>
>> pattern tag index is 3 value spec 0x123456 value mask 0xffffff
>>
>> I might be missing something, but why isn't this enough:
>>
>> pattern tag index is 3 # match whatever is stored at index 3
>>
>> Assuming it can work, then why bother with providing value spec/mask on
>> set_tag? A flow rule pattern matches something, sets some arbitrary tag to
>> be matched by a subsequent flow rule and that's it. It even seems like
>> relying on the index only on both occasions is enough for identification.
>>
>> Same question for the opposite approach; relying on the value, never
>> mentioning the index.
>>
>> I'm under the impression that the index is a hardware-specific constraint
>> that shouldn't be exposed (especially since it's an 8-bit field). If so, a
>> PMD could keep track of used indices without having them exposed through the
>> public API.
>
>
> Thank you for review, Adrien.
> Hope you are doing well. It's been long since we talked each other. :-)
>
> Your approach will work too in general but we have a request from customer that
> they want to partition this limited tag storage. Assuming that HW exposes 32bit
> tags (those are 'registers' in HW pipeline in mlx5 HW). Then, customers want to
> store multiple data even in a 32-bit storage. For example, 16bit vlan tag, 8bit
> table id and 8bit flow id. As they want to split one 32bit storage, I thought it
> is better to provide mask when setting/matching the value. Even some customer
> wants to store multiple flags bit by bit like ol_flags. They do want to alter
> only partial bits.
>
> And for the index, it is to reference an entry of tags array as HW can provide
> larger registers than 32-bit. For example, mlx5 HW would provide 4 of 32b
> storage which users can use for their own sake.
> tag[0], tag[1], tag[2], tag[3]
Adrien,
Are you okay with this?
Thanks,
Yongseok
next prev parent reply other threads:[~2019-07-08 23:32 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-03 21:32 [dpdk-dev] [RFC 1/3] ethdev: extend flow metadata Yongseok Koh
2019-06-03 21:32 ` [dpdk-dev] [RFC 2/3] ethdev: add flow modify mark action Yongseok Koh
2019-06-06 10:35 ` Jerin Jacob Kollanukkaran
2019-06-06 18:33 ` Yongseok Koh
2019-06-03 21:32 ` [dpdk-dev] [RFC 3/3] ethdev: add flow tag Yongseok Koh
2019-07-04 23:23 ` [dpdk-dev] [PATCH] " Yongseok Koh
2019-07-05 13:54 ` Adrien Mazarguil
2019-07-05 18:05 ` Yongseok Koh
2019-07-08 23:32 ` Yongseok Koh [this message]
2019-07-09 8:38 ` Adrien Mazarguil
2019-07-11 1:59 ` Yongseok Koh
2019-10-08 12:57 ` Yigit, Ferruh
2019-10-08 13:18 ` Slava Ovsiienko
2019-10-10 16:09 ` [dpdk-dev] [PATCH v2] " Viacheslav Ovsiienko
2019-10-24 13:12 ` [dpdk-dev] [PATCH v3] " Viacheslav Ovsiienko
2019-10-27 16:38 ` Ori Kam
2019-10-27 18:42 ` [dpdk-dev] [PATCH v4] " Viacheslav Ovsiienko
2019-10-27 19:11 ` Ori Kam
2019-10-31 18:57 ` Ferruh Yigit
2019-06-09 14:23 ` [dpdk-dev] [RFC 1/3] ethdev: extend flow metadata Andrew Rybchenko
2019-06-10 3:19 ` Wang, Haiyue
2019-06-10 7:20 ` Andrew Rybchenko
2019-06-11 0:06 ` Yongseok Koh
2019-06-19 9:05 ` Andrew Rybchenko
2019-07-04 23:21 ` [dpdk-dev] [PATCH] " Yongseok Koh
2019-07-10 9:31 ` Olivier Matz
2019-07-10 9:55 ` Bruce Richardson
2019-07-10 10:07 ` Olivier Matz
2019-07-10 12:01 ` Bruce Richardson
2019-07-10 12:26 ` Thomas Monjalon
2019-07-10 16:37 ` Yongseok Koh
2019-07-11 7:44 ` Adrien Mazarguil
2019-07-14 11:46 ` Andrew Rybchenko
2019-07-29 15:06 ` Adrien Mazarguil
2019-10-08 12:51 ` Yigit, Ferruh
2019-10-08 13:17 ` Slava Ovsiienko
2019-10-10 16:02 ` [dpdk-dev] [PATCH v2] " Viacheslav Ovsiienko
2019-10-18 9:22 ` Olivier Matz
2019-10-19 19:47 ` Slava Ovsiienko
2019-10-21 16:37 ` Olivier Matz
2019-10-24 6:49 ` Slava Ovsiienko
2019-10-24 9:22 ` Olivier Matz
2019-10-24 12:30 ` Slava Ovsiienko
2019-10-24 13:08 ` [dpdk-dev] [PATCH v3] " Viacheslav Ovsiienko
2019-10-27 16:56 ` Ori Kam
2019-10-27 18:40 ` [dpdk-dev] [PATCH v4] " Viacheslav Ovsiienko
2019-10-27 19:10 ` Ori Kam
2019-10-29 16:22 ` Andrew Rybchenko
2019-10-29 17:19 ` Slava Ovsiienko
2019-10-29 18:30 ` Thomas Monjalon
2019-10-29 18:35 ` Slava Ovsiienko
2019-10-30 6:28 ` Andrew Rybchenko
2019-10-30 7:35 ` Andrew Rybchenko
2019-10-30 8:59 ` Slava Ovsiienko
2019-10-30 9:20 ` Andrew Rybchenko
2019-10-30 10:05 ` Slava Ovsiienko
2019-10-30 10:03 ` Slava Ovsiienko
2019-10-30 15:49 ` Olivier Matz
2019-10-31 9:25 ` Andrew Rybchenko
2019-10-29 16:25 ` Olivier Matz
2019-10-29 16:33 ` Olivier Matz
2019-10-29 17:53 ` Slava Ovsiienko
2019-10-29 17:43 ` Slava Ovsiienko
2019-10-29 19:31 ` [dpdk-dev] [PATCH v5] " Viacheslav Ovsiienko
2019-10-30 8:02 ` Andrew Rybchenko
2019-10-30 14:40 ` Slava Ovsiienko
2019-10-30 14:46 ` Slava Ovsiienko
2019-10-30 15:20 ` Olivier Matz
2019-10-30 15:57 ` Thomas Monjalon
2019-10-30 15:58 ` Slava Ovsiienko
2019-10-30 16:13 ` Olivier Matz
2019-10-30 8:35 ` Ori Kam
2019-10-30 17:12 ` [dpdk-dev] [PATCH v6 0/2] extend flow metadata feature Viacheslav Ovsiienko
2019-10-30 17:12 ` [dpdk-dev] [PATCH v6 1/2] ethdev: extend flow metadata Viacheslav Ovsiienko
2019-10-31 9:19 ` Andrew Rybchenko
2019-10-31 13:05 ` [dpdk-dev] [PATCH v7 0/2] extend flow metadata feature Viacheslav Ovsiienko
2019-10-31 13:05 ` [dpdk-dev] [PATCH v7 1/2] ethdev: extend flow metadata Viacheslav Ovsiienko
2019-10-31 15:47 ` Olivier Matz
2019-10-31 16:13 ` Slava Ovsiienko
2019-10-31 16:48 ` [dpdk-dev] [PATCH v8 0/2] extend flow metadata feature Viacheslav Ovsiienko
2019-10-31 16:48 ` [dpdk-dev] [PATCH v8 1/2] ethdev: extend flow metadata Viacheslav Ovsiienko
2019-11-04 6:13 ` [dpdk-dev] [PATCH v9 0/2] extend flow metadata feature Viacheslav Ovsiienko
2019-11-04 6:13 ` [dpdk-dev] [PATCH v9 1/2] ethdev: extend flow metadata Viacheslav Ovsiienko
2019-11-05 14:19 ` [dpdk-dev] [PATCH v10 0/2] extend flow metadata feature Viacheslav Ovsiienko
2019-11-05 14:19 ` [dpdk-dev] [PATCH v10 1/2] ethdev: extend flow metadata Viacheslav Ovsiienko
2019-11-05 14:19 ` [dpdk-dev] [PATCH v10 2/2] ethdev: move egress metadata to dynamic field Viacheslav Ovsiienko
2019-11-06 15:49 ` [dpdk-dev] [PATCH v10 0/2] extend flow metadata feature Ferruh Yigit
2019-11-04 6:13 ` [dpdk-dev] [PATCH v9 2/2] ethdev: move egress metadata to dynamic field Viacheslav Ovsiienko
2019-10-31 16:48 ` [dpdk-dev] [PATCH v8 " Viacheslav Ovsiienko
2019-10-31 17:21 ` Olivier Matz
2019-11-01 12:34 ` Andrew Rybchenko
2019-10-31 13:05 ` [dpdk-dev] [PATCH v7 " Viacheslav Ovsiienko
2019-10-31 13:33 ` Ori Kam
2019-10-31 15:51 ` Olivier Matz
2019-10-31 16:07 ` Slava Ovsiienko
2019-10-30 17:12 ` [dpdk-dev] [PATCH v6 " Viacheslav Ovsiienko
2019-10-31 9:01 ` Andrew Rybchenko
2019-10-31 10:54 ` Slava Ovsiienko
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