Re: [dpdk-dev] [PATCH v4] RSS key use with testpmd

From: oulijun <oulijun@huawei.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>, <wenzhuo.lu@intel.com>,
	<beilei.xing@intel.com>, <adrien.mazarguil@6wind.com>,
	Phil Yang <Phil.Yang@arm.com>
Cc: <dev@dpdk.org>, <linuxarm@huawei.com>
Subject: Re: [dpdk-dev] [PATCH v4] RSS key use with testpmd
Date: Wed, 14 Oct 2020 14:15:04 +0800	[thread overview]
Message-ID: <a8707581-a681-7a70-cd5d-b163fb8bdc23@huawei.com> (raw)
In-Reply-To: <46956bf5-54ff-c8b6-74de-a6338c6d5d3a@intel.com>

在 2020/10/10 2:52, Ferruh Yigit 写道:
> On 10/9/2020 1:09 PM, oulijun wrote:
>>
>>
>> 在 2020/9/30 21:17, Ferruh Yigit 写道:
>>> On 9/24/2020 2:45 PM, Lijun Ou wrote:
>>>> 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
>>>>
>>>> As a result, the step 3 with RSS key and the step 1 RSS key
>>>> is not the same. The patch[1] to solve the above problems.
>>>>
>>>
>>> This is interesting, can you please provide above information in the 
>>> commit log too?
>>>
>> Yes， I submitted detailed operation information in patch v3 as a 
>> commit, and Yang suggested that the operation information be included 
>> in the cover letter.
>  >
> 
> OK, understood.
> Only, commands helped me to understand the problem, it is easy to grasp 
> the issue with samples, so I thought it may help others later in if it 
> is in the commit log, since cover letter won't be visible in the git repo.
> 
> @Phil, will you be OK to have them in the commit log if the checkpatch 
> warnings fixed?
> 
>>> Also can you please provide the details on why this happens, 
>>> callstack can help?
>>>
>> When you 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.
> 
> Above description looks good, can you include this to the commit log 
> please?
> 
Hi，Ferruh
   Your opinion is to put the following comit log in app/testpmd: fix 
the default RSS key configuration？
   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

>>> Thanks,
>>> ferruh
>>>
>>>
>>>> Lijun Ou (1):
>>>>    app/testpmd: fix the default RSS key configuration
>>>>
>>>>   app/test-pmd/cmdline_flow.c | 8 ++++++++
>>>>   1 file changed, 8 insertions(+)
>>>>
>>>
>>> .
>>>
> 
> .
> 