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Date: Tue, 15 Apr 2014 13:17:50 -0700 From: Cong Wang <xiyou.wangcong@...il.com> To: Jamal Hadi Salim <jhs@...atatu.com> Cc: Stephen Hemminger <stephen@...workplumber.org>, Linux Kernel Network Developers <netdev@...r.kernel.org>, David Miller <davem@...emloft.net> Subject: Re: [Patch iproute2] u32: add terminal parameter On Tue, Apr 15, 2014 at 6:00 AM, Jamal Hadi Salim <jhs@...atatu.com> wrote: > On 04/14/14 21:57, Cong Wang wrote: > >> So essentially why u32 filters can't just do matching without bothering > > > u32 is a special animal. You can actually have intermediate nodes > which are _not_ terminal. i.e you can build a tree of hashes which > interconnect other hashes eventually leading to terminal nodes. > I knew, I thought at least classid is an alternative for action, that is, one doing classify and one doing some other action. > >> classid especially when they are attached to an ingress qdisc? I still >> fail to see a reason why I have to care about classid here. > > > It is more of a historical artifact with "benefits". > Historical in that egress qdiscs with classes existed before ingress; > so it makes sense to keep the syntax people are already familiar with. > Benefits because infact with the right approach the flowid even at > ingress can be used as input(look at the route classifier for example > and association with route accounting of the source). > I see. The next question would be what is a reasonable classid value for a classless qdisc? Or can we set it to some value to express "we don't care"? Thanks! -- 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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