From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id D91C9A04FC; Tue, 17 Dec 2019 12:21:29 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id E4EEB1BEB2; Tue, 17 Dec 2019 12:21:28 +0100 (CET) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by dpdk.org (Postfix) with ESMTP id DFAAD330 for ; Tue, 17 Dec 2019 12:21:26 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Dec 2019 03:21:25 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,325,1571727600"; d="scan'208";a="247418027" Received: from vmedvedk-mobl.ger.corp.intel.com (HELO [10.237.220.96]) ([10.237.220.96]) by fmsmga002.fm.intel.com with ESMTP; 17 Dec 2019 03:21:22 -0800 To: Anoob Joseph , "Ananyev, Konstantin" , Akhil Goyal , Adrien Mazarguil , "Doherty, Declan" , "Yigit, Ferruh" , Jerin Jacob Kollanukkaran , Thomas Monjalon Cc: Ankur Dwivedi , Hemant Agrawal , Matan Azrad , "Nicolau, Radu" , Shahaf Shuler , Narayana Prasad Raju Athreya , "dev@dpdk.org" References: <1575801683-27269-1-git-send-email-anoobj@marvell.com> <1fc05516-3686-4267-a760-edbe0b92bc87@intel.com> From: "Medvedkin, Vladimir" Message-ID: <0a7d957d-e1f6-835b-15d8-4bccc491b4f9@intel.com> Date: Tue, 17 Dec 2019 11:21:22 +0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Subject: Re: [dpdk-dev] [EXT] Re: [PATCH] ethdev: allow multiple security sessions to use one rte flow X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Hi Anoob, On 16/12/2019 16:16, Anoob Joseph wrote: > Hi Vladimir, > > Please see inline. > > Thanks, > Anoob > >> -----Original Message----- >> From: Medvedkin, Vladimir >> Sent: Monday, December 16, 2019 9:29 PM >> To: Anoob Joseph ; Ananyev, Konstantin >> ; Akhil Goyal ; Adrien >> Mazarguil ; Doherty, Declan >> ; Yigit, Ferruh ; Jerin Jacob >> Kollanukkaran ; Thomas Monjalon >> >> Cc: Ankur Dwivedi ; Hemant Agrawal >> ; Matan Azrad ; Nicolau, >> Radu ; Shahaf Shuler ; >> Narayana Prasad Raju Athreya ; dev@dpdk.org >> Subject: [EXT] Re: [dpdk-dev] [PATCH] ethdev: allow multiple security sessions to >> use one rte flow >> >> External Email >> >> ---------------------------------------------------------------------- >> Hi Anoob, >> >> On 11/12/2019 17:33, Anoob Joseph wrote: >>> Hi Konstantin, >>> >>> Please see inline. >>> >>> Thanks, >>> Anoob >>> >>>> -----Original Message----- >>>> From: dev On Behalf Of Ananyev, Konstantin >>>> Sent: Wednesday, December 11, 2019 4:36 PM >>>> To: Anoob Joseph ; Akhil Goyal >>>> ; Adrien Mazarguil ; >>>> Doherty, Declan ; Yigit, Ferruh >>>> ; Jerin Jacob Kollanukkaran >>>> ; Thomas Monjalon >>>> Cc: Ankur Dwivedi ; Hemant Agrawal >>>> ; Matan Azrad ; >> Nicolau, >>>> Radu ; Shahaf Shuler ; >>>> Narayana Prasad Raju Athreya ; dev@dpdk.org >>>> Subject: Re: [dpdk-dev] [PATCH] ethdev: allow multiple security >>>> sessions to use one rte flow >>>> >>>> >>>>>>> The rte_security API which enables inline protocol/crypto feature >>>>>>> mandates that for every security session an rte_flow is created. >>>>>>> This would internally translate to a rule in the hardware which >>>>>>> would do packet classification. >>>>>>> >>>>>>> In rte_securty, one SA would be one security session. And if an >>>>>>> rte_flow need to be created for every session, the number of SAs >>>>>>> supported by an inline implementation would be limited by the >>>>>>> number of rte_flows the PMD would be able to support. >>>>>>> >>>>>>> If the fields SPI & IP addresses are allowed to be a range, then >>>>>>> this limitation can be overcome. Multiple flows will be able to >>>>>>> use one rule for SECURITY processing. In this case, the security >>>>>>> session provided as conf would be NULL. >>>>>> Wonder what will be the usage model for it? >>>>>> AFAIK, RFC 4301 clearly states that either SPI value alone or in >>>>>> conjunction with dst (and src) IP should clearly identify SA for >>>>>> inbound SAD >>>> lookup. >>>>>> Am I missing something obvious here? >>>>> [Anoob] Existing SECURITY action type requires application to create >>>>> an 'rte_flow' per SA, which is not really required if h/w can use >>>>> SPI to uniquely >>>> identify the security session/SA. >>>>> Existing rte_flow usage: IP (dst,src) + ESP + SPI -> security >>>>> processing enabled on one security session (ie on SA) >>>>> >>>>> The above rule would uniquely identify packets for an SA. But with >>>>> the above usage, we would quickly exhaust entries available in h/w >>>>> lookup tables (which are limited on our hardware). But if h/w can >>>>> use SPI field to index >>>> into a table (for example), then the above requirement of one >>>> rte_flow per SA is not required. >>>>> Proposed rte_flow usage: IP (any) + ESP + SPI (any) -> security >>>>> processing enabled on all ESP packets >> So this means that SA will be indexed only by spi? What about SA's which are >> indexed by SPI+DIP+SIP? >>>>> Now h/w could use SPI to index into a pre-populated table to get >>>>> security session. Please do note that, SPI is not ignored during the >>>>> actual >>>> lookup. Just that it is not used while creating 'rte_flow'. >>>> >>>> And this table will be prepopulated by user and pointer to it will be >>>> somehow passed via rte_flow API? >>>> If yes, then what would be the mechanism? >>> [Anoob] I'm not sure what exactly you meant by user. But may be I'll explain >> how it's done in OCTEONTX2 PMD. >>> The application would create security_session for every SA. SPI etc would be >> available to PMD (in conf) when the session is created. Now the PMD would >> populate SA related params in a specific location that h/w would access. This >> memory is allocated during device configure and h/w would have the pointer >> after the initialization is done. >> If memory is allocated during device configure what is upper limit for number of >> sessions? What if app needs more? >>> PMD uses SPI as index to write into specific locations(during session create) >> and h/w would use it when it sees an ESP packet eligible for SECURITY (in receive >> path, per packet). As long as session creation could populate at memory >> locations that h/w would look at, this scheme would work. > [Anoob] Yes. But we need to allow application to control the h/w ipsec processing as well. Let's say, application wants to handle a specific SPI range in lookaside mode (may be because of unsupported capabilities?), in that case having rte_flow will help in fine tuning how the h/w packet steering happens. Also, rte_flow enables H/w parsing on incoming packets. This info is useful even after IPsec processing is complete. Or if application wants to give higher priority to a range of SPIs, rte_flow would allow doing so. > >> What algorithm of indexing by SPI is there? Could I use any arbitrary SPI? If some >> kind of hashing is used, what about collisions? > [Anoob] That is implementation dependent. In our PMD, we map it one to one. As in, SPI is used as index in the table. So, as far as you are mapping one to one and using SPI as an index, a lot of memory is wasted in the table for unused SPI's.  Also, you are not able to have a table with 2^32 sessions. It is likely that some number of SPI's least significant bits are used as an index. And it raises a question - what if application needs two sessions with different SPI's which have the same lsb's? Moreover, what about two sessions with same SPI but different dst and src ip addresses? > >>>>> The usage of one 'rte_flow' for multiple SAs is not mandatory. It is >>>>> only required when application requires large number of SAs. The >>>>> proposed >>>> change is to allow more efficient usage of h/w resources where it's >>>> permitted by the PMD. >>>>>>> Application should do an rte_flow_validate() to make sure the flow >>>>>>> is supported on the PMD. >>>>>>> >>>>>>> Signed-off-by: Anoob Joseph >>>>>>> --- >>>>>>> lib/librte_ethdev/rte_flow.h | 6 ++++++ >>>>>>> 1 file changed, 6 insertions(+) >>>>>>> >>>>>>> diff --git a/lib/librte_ethdev/rte_flow.h >>>>>>> b/lib/librte_ethdev/rte_flow.h index 452d359..21fa7ed 100644 >>>>>>> --- a/lib/librte_ethdev/rte_flow.h >>>>>>> +++ b/lib/librte_ethdev/rte_flow.h >>>>>>> @@ -2239,6 +2239,12 @@ struct rte_flow_action_meter { >>>>>>> * direction. >>>>>>> * >>>>>>> * Multiple flows can be configured to use the same security session. >>>>>>> + * >>>>>>> + * The NULL value is allowed for security session. If security >>>>>>> + session is NULL, >>>>>>> + * then SPI field in ESP flow item and IP addresses in flow items >>>>>>> + 'IPv4' and >>>>>>> + * 'IPv6' will be allowed to be a range. The rule thus created >>>>>>> + can enable >>>>>>> + * SECURITY processing on multiple flows. >>>>>>> + * >>>>>>> */ >>>>>>> struct rte_flow_action_security { >>>>>>> void *security_session; /**< Pointer to security session structure. >>>>>>> */ >>>>>>> -- >>>>>>> 2.7.4 >> -- >> Regards, >> Vladimir -- Regards, Vladimir