Wed, May 31, 2017 at 02:27:02PM CEST, jb...@redhat.com wrote: >On Tue, 16 May 2017 19:29:37 +0200, Jiri Pirko wrote: >> From: Jiri Pirko <j...@mellanox.com> >> >> Allow user to set control action "goto" with filter chain index as >> a parameter. >> >> Signed-off-by: Jiri Pirko <j...@mellanox.com> >> --- >> include/linux/pkt_cls.h | 16 +++++++++++++++- >> man/man8/tc-ife.8 | 2 +- >> man/man8/tc-pedit.8 | 2 +- >> man/man8/tc-police.8 | 2 +- >> man/man8/tc-vlan.8 | 2 +- > >Jiri, this *seriously* needs a proper documentation. I consider myself >to be well above average in understanding tc filters and actions, and as >you know I participated at least passively in some chats about the >chains. Yet I'm still very lost in semantics of chains. I cannot >imagine how an average user would be able to use this. > >Some questions about the semantics: > >- What chain(s) are processed by default? If I don't use goto_chain but > have multiple chains, will only chain 0 be processed, or more? In > what order, what are the rules? If I don't have a chain 0, what would > happen?
0 only. I exepcter it makes sense. But you are right, I will put it to man. > >- What is the relation between priorities and chains? I expected that > chains are under the same priority but that's not the case in your > example. For a user, it's very unclear why there are priorities and > chains. They appear to do the same thing, why can't I just jump > between priorities? Basically, what we had previously was single chain (0) only. Now we have multichain, each chain is completely independent list of tps, each tp having its prio. I will also add this to man. > >Please, in addition to explaining here on the list, add detailed >explanation to the man pages. > >Thanks, > > Jiri
