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From: Anoob Joseph <anoobj@marvell.com>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	Akhil Goyal <akhil.goyal@nxp.com>,
	Adrien Mazarguil <adrien.mazarguil@6wind.com>,
	"Doherty, Declan" <declan.doherty@intel.com>,
	"Yigit, Ferruh" <ferruh.yigit@intel.com>,
	Jerin Jacob Kollanukkaran <jerinj@marvell.com>,
	Thomas Monjalon <thomas@monjalon.net>
Cc: Ankur Dwivedi <adwivedi@marvell.com>,
	Hemant Agrawal <hemant.agrawal@nxp.com>,
	Matan Azrad <matan@mellanox.com>,
	"Nicolau, Radu" <radu.nicolau@intel.com>,
	Shahaf Shuler <shahafs@mellanox.com>,
	"Narayana Prasad Raju Athreya" <pathreya@marvell.com>,
	"dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] ethdev: allow multiple security sessions to use one rte flow
Date: Wed, 11 Dec 2019 17:33:23 +0000	[thread overview]
Message-ID: <MN2PR18MB2877C4D70B32ECDFED9F82E8DF5A0@MN2PR18MB2877.namprd18.prod.outlook.com> (raw)
In-Reply-To: <BN7PR11MB2547EAF3CE86AAE432F903E29A5A0@BN7PR11MB2547.namprd11.prod.outlook.com>

Hi Konstantin,

Please see inline.

Thanks,
Anoob

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Ananyev, Konstantin
> Sent: Wednesday, December 11, 2019 4:36 PM
> To: Anoob Joseph <anoobj@marvell.com>; Akhil Goyal <akhil.goyal@nxp.com>;
> Adrien Mazarguil <adrien.mazarguil@6wind.com>; Doherty, Declan
> <declan.doherty@intel.com>; Yigit, Ferruh <ferruh.yigit@intel.com>; Jerin Jacob
> Kollanukkaran <jerinj@marvell.com>; Thomas Monjalon
> <thomas@monjalon.net>
> Cc: Ankur Dwivedi <adwivedi@marvell.com>; Hemant Agrawal
> <hemant.agrawal@nxp.com>; Matan Azrad <matan@mellanox.com>; Nicolau,
> Radu <radu.nicolau@intel.com>; Shahaf Shuler <shahafs@mellanox.com>;
> Narayana Prasad Raju Athreya <pathreya@marvell.com>; 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
> >
> > 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.

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.
 
> 
> >
> > 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 <anoobj@marvell.com>
> > > > ---
> > > >  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


  reply	other threads:[~2019-12-11 17:33 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-08 10:41 Anoob Joseph
2019-12-09  7:37 ` Jerin Jacob
2019-12-10 20:47   ` Ori Kam
2020-01-20  9:51     ` Thomas Monjalon
2019-12-09 13:18 ` Ananyev, Konstantin
2019-12-09 13:57   ` Anoob Joseph
2019-12-11 11:06     ` Ananyev, Konstantin
2019-12-11 17:33       ` Anoob Joseph [this message]
2019-12-13 11:55         ` Ananyev, Konstantin
2019-12-15  6:07           ` Anoob Joseph
2019-12-16 12:54             ` Ananyev, Konstantin
2019-12-16 15:37               ` Anoob Joseph
2019-12-16 15:58         ` Medvedkin, Vladimir
2019-12-16 16:16           ` [dpdk-dev] [EXT] " Anoob Joseph
2019-12-17 11:21             ` Medvedkin, Vladimir
2019-12-17 14:24               ` Anoob Joseph
2019-12-17 17:44                 ` Medvedkin, Vladimir
2019-12-18  3:54                   ` Anoob Joseph
2019-12-18 13:52                     ` Medvedkin, Vladimir
2019-12-19  4:37                       ` Anoob Joseph
2019-12-19 17:45                         ` Medvedkin, Vladimir
2019-12-23 13:34                         ` Ananyev, Konstantin
2020-01-08 14:29                           ` Medvedkin, Vladimir
2020-01-09  7:35                             ` Ori Kam
2020-01-14  9:27                               ` Anoob Joseph
2020-01-16 11:36                                 ` Ori Kam
2020-01-16 12:03                                   ` Anoob Joseph
2020-01-16 13:37                                     ` Ori Kam
2020-01-18  8:11                                       ` Anoob Joseph
2020-01-19  7:25                                         ` Ori Kam

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