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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: oulijun <oulijun@huawei.com>,
	wenzhuo.lu@intel.com, beilei.xing@intel.com,
	adrien.mazarguil@6wind.com
Cc: dev@dpdk.org, linuxarm@huawei.com,
	Ophir Munk <ophirmu@nvidia.com>, Ori Kam <orika@nvidia.com>
Subject: Re: [dpdk-dev] [PATCH v5] app/testpmd: fix the default RSS key configuration
Date: Thu, 15 Oct 2020 15:43:37 +0100
Message-ID: <8c543941-e881-aa88-b52a-a70bfe8f6fcf@intel.com> (raw)
In-Reply-To: <51676746-ec95-aff2-dc00-b76480ab6cba@huawei.com>

On 10/15/2020 3:04 PM, oulijun wrote:
> 
> 
> 在 2020/10/15 21:52, Ferruh Yigit 写道:
>> On 10/15/2020 1:41 PM, Lijun Ou wrote:
>>> When start the testpmd, the pmd driver initializes the RSS
>>> configuration. Generally, the recommended RSS hash key is
>>> used as the default key in the driver. In addition, the
>>> default key is different from the default RSS flow in testpmd
>>> without specifying RSS hash key. So. if you do not specify
>>> the RSS key when creating an RSS rule, the testpmd uses the
>>> default key as the default RSS key of the RSS rule. As a result,
>>> you may mistakenly consider that the RSS key in use is the valid
>>> default key of the NIC, actually, the key and the valid default
>>> key of the NIC are two values.
>>>
>>> Consider the follow usage with testpmd:
>>> 1. first, startup testpmd:
>>> testpmd> show port 0 rss-hash key
>>> RSS functions:
>>>    all ipv4-frag ipv4-other ipv6-frag ipv6-other ip
>>> RSS key:
>>> -6D5A56DA255B0EC24167253D43A38FB0D0CA2BCBAE7B30B477CB2DA38030F
>>> -20C6A42B73BBEAC01FA
>>> 2. create a rss rule
>>> testpmd> flow create 0 ingress pattern eth / ipv4 / udp / end actions rss \
>>> types ipv4-udp end queues end / end
>>>
>>> 3. show rss-hash key
>>> testpmd> show port 0 rss-hash key
>>> RSS functions:
>>>    all ipv4-udp udp
>>> RSS key:
>>> -74657374706D6427732064656661756C74205253532068617368206B65792C206F
>>> -76657272696465
>>>
>>> In order to solve the above problems, it use the NIC valid default
>>> RSS key instead of the testpmd dummy RSS key in the flow configuration
>>> when the RSS key is not specified in the flow rule. If the NIC RSS key
>>> is invalid, it will use testpmd dummy RSS key as the default key.
>>>
>>> Fixes: ac8d22de2394 ("ethdev: flatten RSS configuration in flow API")
>>> Cc: stable@dpdk.org
>>>
>>> Signed-off-by: Lijun Ou <oulijun@huawei.com>
>>> Reviewed-by: Phil Yang <phil.yang@arm.com>
>>> ---
>>> V4->V5:
>>> -rewrite the commit log
>>> -add reviewed-by
>>
>> Hi Lijun,
>>
>> There were multiple other comments, it seems they are not addressed but only 
>> updated the commit log, can you please check comments to prev versions.
>>
>> Before going into the details, my question was what happens if default key not 
>> provided at all?
>> It seems this has been already tried by Ophir [1], later reverted back [2] 
>> bringing the initial issue back.
>>
>> According commit, the reason of revert is to support following command:
>> "flow create 0 <pattern> actions rss queues 0 1 end key_len 40 / end"
>>
>> @Ophir, @Lijun,
>> Can we ignore the 'key_len' if the 'key' is not supported and solve current 
>> issue as initially intended ([1])?
>>
> Hi, Ferruh
>    I have discussed with Phil Yang about the problem in [1]. I think there may 
> be other problems with the idea and there is no better solution. and we need to 
> remove key_len definition from rte_rss_conf structure. They don't have a plan. 
> And [1] was eventually reverted.
> 

Why ignoring 'key_len' (set it to zero) when there is no 'key' provided doesn't 
work?

> Thanks
> Lijun Ou
>>
>> [1] https://git.dpdk.org/dpdk/commit/?id=a4391f8bae8
>>
>> [2] https://git.dpdk.org/dpdk/commit/?id=f3698c3d09a
>> .
>>


  reply index

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-10  1:51 [dpdk-dev] [PATCH v3] " Lijun Ou
2020-09-22  9:51 ` Phil Yang
2020-09-22 13:50   ` oulijun
2020-09-22 15:44     ` Phil Yang
2020-09-24 13:45 ` [dpdk-dev] [PATCH v4] RSS key use with testpmd Lijun Ou
2020-09-24 13:45   ` [dpdk-dev] [PATCH v4] app/testpmd: fix the default RSS key configuration Lijun Ou
2020-09-29 15:35     ` Phil Yang
2020-09-30 12:57     ` Ferruh Yigit
2020-10-09 11:55       ` oulijun
2020-10-09 18:27         ` Ferruh Yigit
2020-10-09 18:54           ` Ferruh Yigit
2020-09-30 13:36     ` Ferruh Yigit
2020-10-09 11:59       ` oulijun
2020-10-09 18:36         ` Ferruh Yigit
2020-10-15 12:41     ` [dpdk-dev] [PATCH v5] " Lijun Ou
2020-10-15 13:52       ` Ferruh Yigit
2020-10-15 14:04         ` oulijun
2020-10-15 14:43           ` Ferruh Yigit [this message]
2020-10-15 16:05             ` Ferruh Yigit
2020-10-15 23:21               ` Ophir Munk
2020-10-15 23:53                 ` Ferruh Yigit
2020-10-16  0:14                   ` Ajit Khaparde
2020-10-16  6:46                   ` Ophir Munk
2020-10-16 10:05                     ` oulijun
2020-10-16 15:13                       ` Ophir Munk
2020-10-16 10:04                   ` oulijun
2020-10-16 10:57                     ` Ferruh Yigit
2020-10-16 14:59                       ` Ophir Munk
2020-10-20  9:00                       ` oulijun
2020-10-20 10:02                         ` Ferruh Yigit
2020-10-20 13:35                           ` oulijun
2020-10-20 14:34                             ` Ferruh Yigit
2020-10-21  8:19                               ` oulijun
2020-10-21  9:38                                 ` Ferruh Yigit
2020-10-21 10:07                                   ` oulijun
     [not found]       ` <20201015195637.26476-1-robot@bytheb.org>
2020-10-16  9:39         ` [dpdk-dev] |WARNING| pw80899 " oulijun
2020-10-16  9:41           ` David Marchand
2020-09-30 13:17   ` [dpdk-dev] [PATCH v4] RSS key use with testpmd Ferruh Yigit
2020-10-09 12:09     ` oulijun
2020-10-09 18:52       ` Ferruh Yigit
2020-10-10  3:07         ` Phil Yang
2020-10-14  6:15         ` oulijun
2020-10-14  8:41           ` Ferruh Yigit
2020-10-15 12:30 [dpdk-dev] [PATCH v5] app/testpmd: fix the default RSS key configuration Lijun Ou

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