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Message-ID: <20140825221148.GC30140@casper.infradead.org> Date: Mon, 25 Aug 2014 23:11:48 +0100 From: Thomas Graf <tgraf@...g.ch> To: Jamal Hadi Salim <jhs@...atatu.com> Cc: Scott Feldman <sfeldma@...ulusnetworks.com>, John Fastabend <john.fastabend@...il.com>, Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org, davem@...emloft.net, nhorman@...driver.com, andy@...yhouse.net, dborkman@...hat.com, ogerlitz@...lanox.com, jesse@...ira.com, pshelar@...ira.com, azhou@...ira.com, ben@...adent.org.uk, stephen@...workplumber.org, jeffrey.t.kirsher@...el.com, vyasevic@...hat.com, xiyou.wangcong@...il.com, john.r.fastabend@...el.com, edumazet@...gle.com, f.fainelli@...il.com, roopa@...ulusnetworks.com, linville@...driver.com, dev@...nvswitch.org, jasowang@...hat.com, ebiederm@...ssion.com, nicolas.dichtel@...nd.com, ryazanov.s.a@...il.com, buytenh@...tstofly.org, aviadr@...lanox.com, nbd@...nwrt.org, alexei.starovoitov@...il.com, Neil.Jerram@...aswitch.com, ronye@...lanox.com Subject: Re: [patch net-next RFC 10/12] openvswitch: add support for datapath hardware offload First of all, thanks for the animated discussion, wouldn't want to miss our arguments ;-) On 08/25/14 at 12:48pm, Jamal Hadi Salim wrote: > On 08/25/14 10:54, Thomas Graf wrote: > >On 08/24/14 at 11:15am, Jamal Hadi Salim wrote: > > >Let's keep vendors out of this discussion. > > The API is from a vendor. It is clearly labelled as an OF API. > It covers well abstracting that vendors SDK to enable OF. That > is relevant info. > If it covers all other vendors (which is where > the quark handling comes in), I will be fine with it. > I dont believe it does. If I understand you correctly you are referring to the rocker patch here. That is not part of the API. > >That is simply not the case. The fact that John is using this model > >to replace the flow director ioctl API should prove this. > > depends what NIC classifier John is mapping to. The Intels have > about 4-5 different types of classifier on different hardware Sorry for not addressing this but I think John should speak for himself here, I don't want to misrepresent his plans. > I gave a simple example. > There are a hell more quarks than that. > There are cases where there are multiple tables in terms of net masks > etc. > Yes, this should be handled in the driver. The input is the route > message we already specify and not some XXX_Flow_XXx struct. I would argue that swflow is a superset of a Netlink route. It may infact be very useful to extend the API with something that understands the Netlink representation of a route and have the API translate that to a classifier that can be offloaded. > I would be tagging along with you guys for flows if you: > a) allow for different classifiers. This allows me to implement > u32 and offload it. Agreed. What you seem to disagree on is: - ndo_add_type1([...]) - ndo_add_type2([...]) - ndo_add_type3([...]) vs. - ndo_add_classifier(type, [...]) I honestly have little against the 2nd. It sounds a bit like an ioctl interface though where a giant switch statement will cast the data to a classifier specific struct which is why I slightly dislike it. It looks to me that a specific chip may either work in a flow/filter mode, in a generic programmable mode or by providing a list of very specific filters without a generic flow -> action relation. Having multiple classifier types for all of them gives the impression that an API user could use them in any combination which I would say will typically not be the case. > b) different actions (I think this part is not controversial, you > seem to be having it already). Agreed -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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