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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Andrew Rybchenko <arybchenko@solarflare.com>,
	kirankumark@marvell.com, Thomas Monjalon <thomas@monjalon.net>
Cc: dev@dpdk.org, jerinj@marvell.com, orika@mellanox.com,
	xuanziyang2@huawei.com, cloud.wangxiaoyun@huawei.com,
	zhouguoyang@huawei.com, rosen.xu@intel.com,
	beilei.xing@intel.com, jia.guo@intel.com, rmody@marvell.com,
	shshaikh@marvell.com, ndabilpuram@marvell.com,
	qiming.yang@intel.com, qi.z.zhang@intel.com,
	keith.wiles@intel.com, hemant.agrawal@nxp.com,
	sachin.saxena@nxp.com, wei.zhao1@intel.com, johndale@cisco.com,
	hyonkim@cisco.com, chas3@att.com, matan@mellanox.com,
	shahafs@mellanox.com, viacheslavo@mellanox.com,
	rahul.lakkireddy@chelsio.com, grive@u256.net, lironh@marvell.com,
	jingjing.wu@intel.com, xavier.huwei@huawei.com,
	humin29@huawei.com, yisen.zhuang@huawei.com,
	ajit.khaparde@broadcom.com, somnath.kotur@broadcom.com,
	jasvinder.singh@intel.com, cristian.dumitrescu@intel.com
Subject: Re: [dpdk-dev] [PATCH v6 1/3] ethdev: add level support for RSS offload types
Date: Tue, 1 Sep 2020 14:23:08 +0100
Message-ID: <abe74735-3df0-942b-0c01-3e0eeaec0296@intel.com> (raw)
In-Reply-To: <28785b8b-8b38-6387-56f1-45fa19da892c@solarflare.com>

On 8/29/2020 3:52 PM, Andrew Rybchenko wrote:
> On 8/21/20 2:03 PM, kirankumark@marvell.com wrote:
>> From: Kiran Kumar K <kirankumark@marvell.com>
>>
>> This patch reserves 2 bits as input selection to select Inner and
>> outer layers for RSS computation. It is combined with existing
>> ETH_RSS_* to choose Inner or outer layers for L2, L3 and L4.
>> This functionality already exists in rte_flow through level parameter in
>> RSS action configuration rte_flow_action_rss.
>>
>> Signed-off-by: Kiran Kumar K <kirankumark@marvell.com>
>> ---
>> V7 Changes:
>> * Split ethdev and testpmd changes into seperate patches.
>>
>>   lib/librte_ethdev/rte_ethdev.h | 27 +++++++++++++++++++++++++++
>>   1 file changed, 27 insertions(+)
>>
>> diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
>> index 70295d7ab..2a3a76d37 100644
>> --- a/lib/librte_ethdev/rte_ethdev.h
>> +++ b/lib/librte_ethdev/rte_ethdev.h
>> @@ -552,6 +552,33 @@ struct rte_eth_rss_conf {
>>   #define RTE_ETH_RSS_L3_PRE64	   (1ULL << 53)
>>   #define RTE_ETH_RSS_L3_PRE96	   (1ULL << 52)
>>
>> +/*
>> + * We use the following macros to combine with the above layers to choose
>> + * inner and outer layers or both for RSS computation.
>> + * Note: Default is 0: inner layers, 1: outer layers, 2: both
>> + * bit 50 and 51 are reserved for this.
>> + */
>> +
>> +/**
>> + * Level 0, It basically stands for the innermost encapsulation level RSS
>> + * can be performed on according to PMD and device capabilities.
>> + */
>> +#define ETH_RSS_LEVEL_INNER        (0ULL << 50)
> 
> You're trying to refer to struct rte_flow_action_rss level definition
> when values are chosen, but I think it is
> inaccurate. Primary definition of the level==0 is PMD default,
> not inner. Definition says that typically it is the innermost
> encapsulation level RSS can be performed on according to PMD
> and device capabilities. But it is secondary, primary
> definition is "PMD default". Basically unspecified by the
> caller (structure memset to 0) results in default behaviour.
> 
>> +/**
>> + * Level 1, It basically stands for the outermost encapsulation level RSS
>> + * can be performed on according to PMD and device capabilities.
>> + */
>> +#define ETH_RSS_LEVEL_OUTER        (1ULL << 50)
>> +/**
>> + * Level 2, It basically stands for the both inner and outermost
>> + * encapsulation level RSS can be performed on according to PMD and
>> + * device capabilities.
>> + */
>> +#define ETH_RSS_LEVEL_INNER_OUTER  (2ULL << 50)
> 
> Level equal to 2 is the first after the outermost inner level.
> Level equal to 3 is the second after the outermost inner level
> and so on.
> 
> If we really try to follow level definition from
> rte_flow_action_rss, the problem is that these defines
> are used to define RSS hashing capabilities in
> dev_info.flow_type_rss_offloads. Support for level
> up to 3 levels, does not mean that we can hash on any,
> it could be either outermost or innermost level, but
> not the middle level, if 3 levels are present.
> Or just innermost recognized: either the first one
> if no tunnels recognized, the second if two levels
> are recognized, or the third one if three levels are
> recognized.

Is the more than two levels practically have a usage?
I can see rte_flow accepts any number as level but if it is not practically a 
concern I think we can go with 'inner' & 'outer' only.
And defer more level concern for now.

Even with only 'inner' & 'outer', capability reporting can be a problem tough.
Like if a PMD can calculate hash for inner and outer for TCP but only for outer 
for UDP, how can PMD report this capability?
Again not sure if this is a practically valid concern.

> 
> Sorry, that I'm not proposing any solution right now.
> Just need more time to thing about it.
> You're welcome to try to cover these requirements.
> 
>> +#define ETH_RSS_LEVEL_MASK	   (3ULL << 50)
>> +
>> +#define ETH_RSS_LEVEL(rss_hf) ((rss_hf & ETH_RSS_LEVEL_MASK) >> 50)
>> +
>>   /**
>>    * For input set change of hash filter, if SRC_ONLY and DST_ONLY of
>>    * the same level are used simultaneously, it is the same case as
>> --
>> 2.25.1
>>
> 


  reply	other threads:[~2020-09-01 13:23 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-07 12:04 [dpdk-dev] [PATCH 1/2] " kirankumark
2020-08-07 12:04 ` [dpdk-dev] [PATCH 2/2] net/octeontx2: add rss hash level support kirankumark
2020-08-08 14:36 ` [dpdk-dev] [PATCH v2 1/2] ethdev: add level support for RSS offload types kirankumark
2020-08-08 14:36   ` [dpdk-dev] [PATCH v2 2/2] net/octeontx2: add rss hash level support kirankumark
2020-08-08 14:40   ` [dpdk-dev] [PATCH v2 1/2] ethdev: add level support for RSS offload types Ajit Khaparde
2020-08-14  3:55     ` [dpdk-dev] [EXT] " Kiran Kumar Kokkilagadda
2020-08-18  7:21   ` [dpdk-dev] [PATCH v3 " kirankumark
2020-08-18  7:21     ` [dpdk-dev] [PATCH v3 2/2] net/octeontx2: add rss hash level support kirankumark
2020-08-18 10:03       ` Jerin Jacob
2020-08-18 10:10         ` [dpdk-dev] [EXT] " Kiran Kumar Kokkilagadda
2020-08-18 10:31     ` [dpdk-dev] [PATCH v4 1/2] ethdev: add level support for RSS offload types kirankumark
2020-08-18 10:31       ` [dpdk-dev] [PATCH v4 2/2] net/octeontx2: add rss hash level support kirankumark
2020-08-18 10:52       ` [dpdk-dev] [PATCH v4 1/2] ethdev: add level support for RSS offload types Jeff Guo
2020-08-18 11:43         ` [dpdk-dev] [EXT] " Kiran Kumar Kokkilagadda
2020-08-19  6:04       ` [dpdk-dev] [PATCH v5 " kirankumark
2020-08-19  6:04         ` [dpdk-dev] [PATCH v5 2/2] net/octeontx2: add rss hash level support kirankumark
2020-08-20  3:19         ` [dpdk-dev] [PATCH v5 1/2] ethdev: add level support for RSS offload types Ajit Khaparde
2020-08-21 10:57           ` [dpdk-dev] [EXT] " Kiran Kumar Kokkilagadda
2020-08-21 11:03         ` [dpdk-dev] [PATCH v6 1/3] " kirankumark
2020-08-21 11:03           ` [dpdk-dev] [PATCH v6 2/3] app/testpmd: support ethdev rss level config kirankumark
2020-08-29  0:48             ` Ajit Khaparde
2020-08-21 11:03           ` [dpdk-dev] [PATCH v6 3/3] net/octeontx2: add rss hash level support kirankumark
2020-08-29 14:52           ` [dpdk-dev] [PATCH v6 1/3] ethdev: add level support for RSS offload types Andrew Rybchenko
2020-09-01 13:23             ` Ferruh Yigit [this message]
2020-09-01  3:27           ` [dpdk-dev] [PATCH v7 " kirankumark
2020-09-01  3:27             ` [dpdk-dev] [PATCH v7 2/3] app/testpmd: support ethdev rss level config kirankumark
2020-09-01  3:27             ` [dpdk-dev] [PATCH v7 3/3] net/octeontx2: add rss hash level support kirankumark
2020-09-01 13:37             ` [dpdk-dev] [PATCH v7 1/3] ethdev: add level support for RSS offload types Ferruh Yigit
2020-09-01 14:27               ` [dpdk-dev] [EXT] " Kiran Kumar Kokkilagadda
2020-09-01 14:44                 ` Ferruh Yigit
2020-09-01 14:54                 ` Ferruh Yigit
2020-09-01 17:11                 ` Ajit Khaparde
2020-09-03 10:11                   ` Kiran Kumar Kokkilagadda
2020-09-03 13:14                     ` Ferruh Yigit
2020-09-07  8:12                       ` Andrew Rybchenko
2020-09-08 19:40                         ` Ajit Khaparde
2020-09-17  2:07             ` [dpdk-dev] [PATCH v8 " kirankumark
2020-09-17  2:07               ` [dpdk-dev] [PATCH v8 2/3] app/testpmd: support ethdev rss level config kirankumark
2020-09-17 18:58                 ` Ajit Khaparde
2020-09-17  2:07               ` [dpdk-dev] [PATCH v8 3/3] net/octeontx2: add rss hash level support kirankumark
2020-09-17  9:36               ` [dpdk-dev] [PATCH v8 1/3] ethdev: add level support for RSS offload types Andrew Rybchenko
2020-09-17 18:56                 ` Ajit Khaparde
2020-09-18 11:40                   ` Ferruh Yigit
2020-08-18 17:39     ` [dpdk-dev] [PATCH v3 1/2] " Ajit Khaparde
2020-08-19  3:58       ` [dpdk-dev] [EXT] " Kiran Kumar Kokkilagadda

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