From: fengchengwen <fengchengwen@huawei.com>
To: Ferruh Yigit <ferruh.yigit@amd.com>, Ori Kam <orika@nvidia.com>,
<cristian.dumitrescu@intel.com>,
Aman Singh <aman.deep.singh@intel.com>,
Yuying Zhang <yuying.zhang@intel.com>,
Thomas Monjalon <thomas@monjalon.net>,
Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Cc: <dev@dpdk.org>, <rasland@nvidia.com>
Subject: Re: [PATCH] ethdev: add calculate hash function
Date: Wed, 11 Oct 2023 10:11:45 +0800 [thread overview]
Message-ID: <04a3c2d3-4912-58f6-68d5-e93dcc1be768@huawei.com> (raw)
In-Reply-To: <1ea4cca3-de4e-4495-ab32-abb88b71bf6d@amd.com>
Hi,
On 2023/10/10 19:05, Ferruh Yigit wrote:
> On 9/26/2023 12:37 PM, Ori Kam wrote:
>> rte_flow supports insert by index table[1].
>>
>> Using the above table, the application can create rules
>> that are based on hash.
>> For example application can create the following logic in order
>> to create load balancing:
>> 1. Create insert by index table with 2 rules, that hashes based on dmac
>> 2. Insert to index 0 a rule that sends the traffic to port A.
>> 3. Insert to index 1 a rule that sends the traffic to port B.
>>
>> Let's also assume that before this table, there is a 5 tuple
>> match table that jumps to the above table.
>>
>> So each packet that matches one of the 5 tuple rules is RSSed
>> to port A or B, based on dmac hash.
>>
>> The issue arises when there is a miss on the 5 tuple table,
>> which resulted due to the packet being the first packet of this flow, or
>> fragmented packet or any other reason.
>> In this case, the application must calculate what would be the
>> hash calculated by the HW so it can send the packet to the correct
>> port.
>>
>> This new API allows applications to calculate the hash value of a given
>> packet for a given table.
>>
>> [1] - http://patches.dpdk.org/project/dpdk/patch/20230208030624.78465-2-akozyrev@nvidia.com/
>>
>> Signed-off-by: Ori Kam <orika@nvidia.com>
>> ---
>> app/test-pmd/cmdline_flow.c | 86 +++++++++++++++++++++++++++++++++++-
>> app/test-pmd/config.c | 54 ++++++++++++++++++++++
>> app/test-pmd/testpmd.h | 2 +
>> lib/ethdev/rte_flow.c | 21 +++++++++
>> lib/ethdev/rte_flow.h | 32 ++++++++++++++
>> lib/ethdev/rte_flow_driver.h | 5 +++
>> lib/ethdev/version.map | 1 +
>> 7 files changed, 200 insertions(+), 1 deletion(-)
>>
>
> This is a new rte_flow API but unfortunately there isn't any
> review/comment, at least it is experimental API. If there is no
> objection/discussion in next few days, I will merge the feature.
>
> Probably it will be another rte flow feature that only NVIDIA knows and
> uses. While mentioned from using, is the driver update for the feature
The hns3 driver support subset of rte_flow, we found the rte_flow feature is very flexible.
And its implementation varies according to vendors.
Can the rte_flow be standardized ?
> planned for this release?
>
>
> Meanwhile, can you please update the documentation, `rte_flow.rst` and
> `testpmd_funcs.rst`?
> Also can you please rebase on top of latest next-net, this patch
> conflicts with merged group set miss action feature.
>
> .
>
next prev parent reply other threads:[~2023-10-11 2:11 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-26 11:37 Ori Kam
2023-10-09 8:15 ` Dariusz Sosnowski
2023-10-10 11:05 ` Ferruh Yigit
2023-10-10 11:42 ` Ori Kam
2023-10-11 2:11 ` fengchengwen [this message]
2023-10-11 8:34 ` Ferruh Yigit
2023-10-10 14:24 ` [PATCH v2] " Ori Kam
2023-10-11 16:08 ` Ferruh Yigit
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