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10--17.151400-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.6.1012-25670.003 X-MDID: 1600325387-Pk6u3HfWZUYS Subject: Re: [dpdk-dev] [PATCH v2 1/4] ethdev: allow negative values in flow rule types 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" On 9/16/20 8:21 PM, Gregory Etelson wrote: > From: Gregory Etelson > Sent: Tuesday, September 15, 2020 13:27 > To: Andrew Rybchenko ; Ajit Khaparde > Cc: dpdk-dev ; Matan Azrad ; Raslan Darawsheh ; Ori Kam ; Gregory Etelson ; Ori Kam ; NBU-Contact-Thomas Monjalon ; Ferruh Yigit > Subject: RE: [dpdk-dev] [PATCH v2 1/4] ethdev: allow negative values in flow rule types > > Subject: Re: [dpdk-dev] [PATCH v2 1/4] ethdev: allow negative values in flow rule types > On 9/15/20 7:36 AM, Ajit Khaparde wrote: > On Tue, Sep 8, 2020 at 1:16 PM Gregory Etelson wrote: > From: Gregory Etelson > > RTE flow items & actions use positive values in item & action type. > Negative values are reserved for PMD private types. PMD > items & actions usually are not exposed to application and are not > used to create RTE flows. > > The patch allows applications with access to PMD flow > items & actions ability to integrate RTE and PMD items & actions > and use them to create flow rule. > While we are reviewing this, some quick comment/questions.. > > Doesn't this go against the above "PMD > items & actions usually are not exposed to application and are not > used to create RTE flows."? > Why would an application try to use PMD specific private types? > Isn't this contrary to having a standard API? > > +1 > > I would like to clarify the purpose and use of private elements patch. > That patch is prerequisite for [PATCH v2 2/4] ethdev: tunnel offload model patch. > The tunnel offload API provides unified hardware independent model to offload tunneled packets, > match on packet headers in hardware and to restore outer headers of partially offloaded packets. > The model implementation depends on hardware capabilities. For example, if hardware supports inner nat, > it can do nat first and postpone decap to the end, while other hardware that cannot do inner nat must decap first > and run nat actions afterwards. Such hardware has to save outer header in some hardware context, > register or memory, for application to restore a packet later, if needed. Also, in this case the exact solution > depends on PMD because of limited number of hardware contexts. > Although application working with DKDK can implement all these requirements with existing flow rules API, > it will have to address each hardware specifications separately. > To solve this limitation we selected design where application quires PMD for actions, or items, > that are optimal for a hardware that PMD represents. Result can be a mixture of RTE and PMD private elements - > it's up to PMD implementation. Application passes these elements back to PMD as a flow rule recipe > that's already optimal for underlying hardware. > If PMD has private elements in such rule items or actions, these private elements must not be rejected by RTE layer. > > I hope it helps to understand what this model is trying to achieve. > Did that clarify your concerns ? There is a very simple question which I can't answer after reading it. Why these PMD specific actions and items do not bind application to a specific vendor. If it binds, it should be clearly stated in the description. If no, I'd like to understand why since opaque actions/items are not really well defined and hardly portable across vendors.