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From: oulijun <oulijun@huawei.com>
To: Ferruh Yigit <ferruh.yigit@intel.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 22:04:05 +0800	[thread overview]
Message-ID: <51676746-ec95-aff2-dc00-b76480ab6cba@huawei.com> (raw)
In-Reply-To: <1b2b0e11-1458-e2d9-5fde-91db35b8bc73@intel.com>



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.

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

  reply	other threads:[~2020-10-15 14:04 UTC|newest]

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 [this message]
2020-10-15 14:43           ` Ferruh Yigit
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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