Hi Andrew, I am now able to access to all the resources you shared with me, thank you!
I have read the ACL plugin description file and it really helps a lot. Besides, the new high performance ACL inplementation seems interesting too :D I will be able to provide feedbacks after gaining some hand-on experiences, looking forwared to collaborating with you :p Best Regards, Pan zhang...@yunshan.net.cn From: Andrew Yourtchenko Date: 2017-05-24 02:48 To: 张攀 CC: vpp-dev Subject: Re: [vpp-dev] ACL Match in fa_node.c Hi Pan! On 5/23/17, 张攀 <zhang...@yunshan.net.cn> wrote: > Hi Andrew! > > > ------------------ Original ------------------ > From: "Andrew Yourtchenko"<ayour...@gmail.com>; > Date: Tue, May 23, 2017 07:56 PM > To: "张攀"<zhang...@yunshan.net.cn>; > Cc: "vpp-dev"<vpp-dev@lists.fd.io>; > Subject: Re: [vpp-dev] ACL Match in fa_node.c > > > Hi! > > On 5/23/17, 张攀 <zhang...@yunshan.net.cn> wrote: >> Hi guys, >> >> >> I looked into the source code of vpp/src/plugin/acl/fa_node.c, >> in function full_acl_match_5tuple(), it seems that every ingress packet >> is >> matching against each ACL rule stored in acl_main->acls in a for-loop >> manner. This seems not fairly effective. > > You're absolutely right on both counts. First make it work, then make > it right, then make it fast :-) I have some ideas that I wanted to > experiment with there, would you be interested to help ? ACL matching > is a fairly distinct function operation to not affect much else. > > [PAN]: I would be very pleased to help as I am also a addicted person to > high performance programming :D > > Great! :-) I will try to sketch the idea tomorrow/thursday and will add you to the draft, so we can work together. (I also will have limited connectivity the next week, so I won't be a lot in your way! :-) (or if you have some good idea on how you'd like to do it, feel free to shoot a doc/code into a gerrit draft, let's see!) > >> >> >> Besides, I notice that in vpp/src/plugin/acl/acl.c，when you call the >> function acl_hook_l2_input_classify(), you will create a >> vnet_classify_table, but I didn't see any code which adds >> classify_session >> to it, why? > > I had used classify table for storing the sessions in the pre-1704 > version of the ACL plugin. > > in 1704 as I was adding the L3, I moved to the new data path while > keeping the old one still around, and potentially switchable (not > terribly gracefully, but still). > > In the current master the classifier is used merely as a hook to get > into the packet processing within the L2 packet path - that's why you > see no sessions added. > > [PAN]: Cool. Correct me if I am wrong: ingress packet will first check > against if there is matched session existing > in fa_node.c and if not, the packet will check against ACL then to decide > whether to create a new session or drop. Exactly, that is the idea! > > > Is there any 'match then action' alike behavior existing in fa_node? And a > long standing mystery question for me: what > does "fa" stand for :p > "FA" is "feature arc" :) When adding the routed path, the feature arc support appeared a bit earlier, and I was "wow, this is so excellent and easy", and I thought I might use the same mechanism in L2 as well, so I just bluntly called everything "fa_*". But then I decided to leave for L2 data path the old mechanism of (ab)using the L2 classifier, since it allowed for a while to retain (just in case) the ability to switch between the old and the new data path. As the time goes, I suspect there might be a better way to hook in L2 forwarding path... > > >> >> >> Is there any document/idea could basically explain the relationships >> between >> acl/fa_node and vnet_classify? > > In a gerrit draft that I am working now on, which aims to provide the > multicore support, there is text file with the history and the > description of operation. If you like, I can add you to the reviewers > list so you can have a look at that - just send me your email that you > use in gerrit. > > [PAN]: Thank you Andrew, I believe this will help a lot. My email is > dazhang...@gmail.com > Excellent, I've just added you, it's 6771. As you notice, it's still a good amount of work to do (lots of clib_warning()s to ensure everything indeed does what I think it does). Looking forward to your feedback! :-) --a > > > --a > >> >> >> Any help will be much appreciated. >> >> >> Best Regards, >> >> >> Pan
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