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| oanson | #startmeeting Dragonflow | 09:00 |
|---|---|---|
| openstack | Meeting started Mon Dec 26 09:00:25 2016 UTC and is due to finish in 60 minutes. The chair is oanson. Information about MeetBot at http://wiki.debian.org/MeetBot. | 09:00 |
| openstack | Useful Commands: #action #agreed #help #info #idea #link #topic #startvote. | 09:00 |
| *** openstack changes topic to " (Meeting topic: Dragonflow)" | 09:00 | |
| openstack | The meeting name has been set to 'dragonflow' | 09:00 |
| oanson | Hello, everyone. Welcome to the weekly Dragonflow meeting. | 09:00 |
| dimak | Good morning | 09:00 |
| xiaohhui | Hi | 09:00 |
| lihi | Hi | 09:00 |
| oanson | Raise you hands, say yeah! (If you're here) | 09:00 |
| ishafran | Hi | 09:00 |
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| oanson | #info lihi xiaohhui ishafran in meeting | 09:01 |
| oanson | #info dimak is also here | 09:01 |
| oanson | yuli_s, nick-ma_, you guys in? | 09:01 |
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| oanson | All right, let;s get this show on the road. | 09:02 |
| oanson | #topic Ocata Roadmap | 09:02 |
| *** openstack changes topic to "Ocata Roadmap (Meeting topic: Dragonflow)" | 09:02 | |
| oanson | lihi, any updates? | 09:02 |
| oanson | (IPv6, that is) | 09:02 |
| lihi | I'm still working on the router discovery | 09:02 |
| lihi | I have a suspicion that ovs doesn't support it properly. But I'm still checking it | 09:03 |
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| oanson | If there is an OVS bug, you can report it, or better yet, we can try working on a fix :) | 09:04 |
| lihi | OK :) | 09:04 |
| lihi | However more comments on the neighbor discovery would be nice :) | 09:05 |
| oanson | I also see the Neighbor Advertiser is coming along nicely. Link: http://review.openstack.org/#/c/412337/ | 09:05 |
| oanson | Next up, NB API refactor | 09:05 |
| oanson | dimak had some interesting ideas on the spec. I am still trying to construct something readable of it | 09:06 |
| oanson | I hope that will be done today. | 09:06 |
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| oanson | I understand that dimak already started working on the implementation with jsontools. So that would be interesting to see too. | 09:06 |
| dimak | oanson, I think we should have some kind of group discussion once the spec is updated | 09:06 |
| dimak | The info is too scattered at the moments | 09:07 |
| oanson | If its all right with everyone, lets schedule it for tomorrow, 8:30 UTC? (That's half an hour before this meeting) | 09:07 |
| oanson | (If I got my timings correct (: ) | 09:07 |
| nick-ma_ | hi | 09:07 |
| dimak | oanson, I have some basic implementation for the proposed idea, I'll upload it as a patch today hopefully | 09:07 |
| oanson | #info nick-ma_ is also in meeting | 09:08 |
| oanson | nick-ma_, hi :) | 09:08 |
| dimak | so anyone interested can examine and play with it | 09:08 |
| oanson | irenab, ^^^^ (if you're here) | 09:08 |
| dimak | we should try to come up with the order of work items as well, so we can merge the refactor gradually | 09:09 |
| oanson | I'll ask her offline later | 09:09 |
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| oanson | There is a list of work items on the spec. If it's not granular enough, we can try breaking it up further | 09:09 |
| dimak | So lets discuss it more in depth tomorrow | 09:10 |
| oanson | Sounds good. | 09:10 |
| oanson | Anything open on SFC? | 09:10 |
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| oanson | dimak, ? | 09:11 |
| dimak | Have some issues with the MPLS labeling scheme | 09:11 |
| oanson | You want to share and consult? | 09:11 |
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| dimak | Namely, mapping locations in SFC graphs to actual labels | 09:12 |
| oanson | What's the issue? | 09:12 |
| dimak | The way we though of doing it originally, was using NSH which has fields for chain, hop# and metadata to store some extra info (e.g. what initial classifier we had, to restore port regs/metadata) | 09:13 |
| dimak | But with MPLS we have to introduce a mapping Chain#, Hop#, Flow classifier# <=> Label | 09:13 |
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| dimak | Which means that each change we have to query some extra table and look for vacant labels | 09:14 |
| dimak | I am not sure this suits key value stores well | 09:14 |
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| oanson | That last one doesn't sound too bad. Changes are made on the Neutron Server nodes. And we have an unique key infrastructure we can use | 09:15 |
| dimak | Its auto-increment | 09:15 |
| dimak | But labels are limited to 20 (+3) bits | 09:15 |
| oanson | Is that a problem (for a first implementation)? | 09:15 |
| xiaohhui | We can make that to be a allocation-pool | 09:16 |
| dimak | We can just ignore it for the moment | 09:16 |
| oanson | And labels have to be unique per destination port | 09:16 |
| xiaohhui | I meant the unique key | 09:16 |
| dimak | oanson, what do you mean? | 09:16 |
| oanson | We could, but I don't think we need that now. | 09:16 |
| oanson | dimak, the label is used by the destination port on the SF / SFF to decide what to do with the packet. | 09:16 |
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| oanson | So if we have the same label on different ports, that belong to different SFFs, there shouldn't be a problem | 09:17 |
| oanson | Am I right? | 09:17 |
| dimak | The key has to be SFF agnostic because ports can move around | 09:17 |
| oanson | From one SFF to another? | 09:17 |
| dimak | and I don't think we'd like to reallocate labels if ports move | 09:17 |
| dimak | yes | 09:17 |
| dimak | A vm migrates | 09:18 |
| xiaohhui | The unique key for lport might use allocation-pool, as it has the possibility to run out of unique key, if the system runs for a long time. | 09:18 |
| oanson | xiaohhui, yes. That's true. We will also want an allocation pool for sNAT addresses | 09:18 |
| oanson | dimak, an SFF is also a VM? It's not planned to be done as flows? | 09:19 |
| xiaohhui | oanson, that will be my plan in next step to refactor the unique key. | 09:19 |
| dimak | SFF is not a vm, its our ovs bridge | 09:19 |
| oanson | xiaohhui, very cool! | 09:19 |
| dimak | but an SF is a VM | 09:19 |
| dimak | so its dest ports can move around | 09:20 |
| oanson | dimak, I see | 09:20 |
| dimak | oanson, I'll try to resolve it this week | 09:21 |
| dimak | Maybe for a first release we'll just ignore 23 bit overflow | 09:21 |
| oanson | dimak, sure. | 09:21 |
| dimak | then introduce some smart mapping and allocation mechanism | 09:22 |
| dimak | Or switch to NSH :) | 09:22 |
| oanson | dimak, sounds good. We can cross that bridge when we get to it. | 09:22 |
| dimak | (I meant add support along with MPLS :) | 09:22 |
| dimak | I hope to upload some initial patches this week although they are still based on the old refactor code | 09:23 |
| oanson | The mapping to labels itself can be handled by the db, e.g. a tables 'union(<keys>) <=> label' with cached reverse lookup | 09:23 |
| dimak | Hope we can have refactoring done quickly so I can base on it | 09:23 |
| yuli_s | For TAPasaService Iren also advised me not to use segment id for tapService from neutron segment pool, but to use other ids, | 09:23 |
| oanson | dimak, that's the plan | 09:23 |
| oanson | yuli_s, sure. We'll get to that in a minute. Let's finish with SFC first | 09:24 |
| yuli_s | if we have a general allocation pool mechanizm I can also reuse it for tap-as-a-service | 09:24 |
| oanson | Anything else for SFC? | 09:24 |
| dimak | Not for now | 09:25 |
| oanson | Great. Tap as a Service | 09:25 |
| oanson | yuli_s, now go | 09:25 |
| yuli_s | thanks | 09:25 |
| yuli_s | For TAPasaService Iren also advised me not to use segment id for tapService from neutron segment pool, but to use other ids, | 09:25 |
| xiaohhui | yuli_s, how would you avoid conflict the vni number with tenant network? | 09:25 |
| yuli_s | IMHO if we have a general allocation pool mechanizm I can also reuse it for tap-as-a-service | 09:25 |
| oanson | yuli_s, why? | 09:25 |
| oanson | Why avoid Neutron's segment ID allocation? | 09:25 |
| oanson | And if we do, how do we avoid the issue xiaohhui just raised? | 09:25 |
| hujie | what about use unique_key for tapService?? | 09:26 |
| yuli_s | neutron segment pool is used for networks | 09:26 |
| oanson | hujie, we may have a conflict with existing VNI's and segment IDs | 09:26 |
| oanson | yuli_s, yes. | 09:26 |
| hujie | as each tapService refers to a lport, and each lport has its owner unique key | 09:26 |
| yuli_s | xiaohhui, it can be done if we assign range that does not coinside with the one used in neutron | 09:27 |
| oanson | yuli_s, 1. How do you verify that? 2. I still don't understand why? | 09:27 |
| yuli_s | oanson, I suppose this can be done during the stack.sh script | 09:27 |
| xiaohhui | Then the configuration should be carefully taken. | 09:28 |
| xiaohhui | taken care | 09:28 |
| oanson | I don't remember seeing anything like that. Do you have a reference? | 09:28 |
| yuli_s | it will assign specific range that will be different that currently used by neutron | 09:28 |
| oanson | And it sounds very error prone, and devstack specific | 09:28 |
| oanson | yuli_s, please first answer why, then we can discuss how. | 09:29 |
| yuli_s | hm | 09:29 |
| yuli_s | [ml2_type_geneve] | 09:29 |
| yuli_s | vni_ranges = 1:1000 | 09:29 |
| yuli_s | that what I can in /etc/neutron/plugins/ml2/ml2_conf.ini file | 09:29 |
| yuli_s | that what I have in /etc/neutron/plugins/ml2/ml2_conf.ini file | 09:29 |
| oanson | Cool. | 09:30 |
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| oanson | I would still like to know why? | 09:30 |
| dimak | is there any metadata we can add to geneve headers to mark this as tap traffic? | 09:30 |
| oanson | dimak, IIRC, encapsulation protocols only give you a VNI field to identify the traffic. geneve specifically is variable-width, but e.g. VxLAN is fixed width on (IIRC) 24 bits | 09:31 |
| yuli_s | according to Iren network segment pool should be used only for networks | 09:31 |
| yuli_s | to distinguish networks | 09:31 |
| oanson | irenab, irenab_ , you here to comment? | 09:32 |
| yuli_s | and not to distinguish TapServices | 09:32 |
| yuli_s | because we can have a lot of TapServices | 09:32 |
| xiaohhui | segment means the L2 segment, I don't think it has to be only used for neutron network. | 09:32 |
| oanson | yuli_s, we can see a TapService as a (tap) network | 09:32 |
| irenab | oanson, sorry, I was at the meeting; was not following the discussion | 09:32 |
| dimak | oanson, vxlan gbp also lets you use 16 bit for group policy id | 09:32 |
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| oanson | irenab, we're discussing why not use Neutron's segment ID allocation for TapService VNI allocation? | 09:33 |
| yuli_s | when we have a lot of TapServices it will "eat" resources assigned to networks | 09:33 |
| oanson | dimak, but we want to support regular VxLAN too (or am I confused and it's the same protocol?) | 09:33 |
| oanson | yuli_s, those VNIs have to come from somewhere anyway | 09:34 |
| dimak | oanson, its an extension | 09:34 |
| dimak | oanson, it conflicts with vxlan gpe though :( | 09:34 |
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| irenab | oanson, I raised this concern on the spec. | 09:34 |
| dimak | irenab, yuli_s oanson maybe we can allocate a single vni then? | 09:35 |
| dimak | and encode the tap id elsewhere? | 09:35 |
| oanson | dimak, I don't think so. If you have multiple TapService on the same remote compute node, you will have a collisionb | 09:35 |
| yuli_s | single vni is not good from security point of view. | 09:35 |
| oanson | irenab, not sure I understand yet why they need to be separate? | 09:36 |
| yuli_s | we do not want to mix traffic from different clients / tenants | 09:36 |
| dimak | maybe we can use source mac and put it back in the destination | 09:36 |
| dimak | if there are several, encode its index too | 09:36 |
| dimak | we have 2 extra bytes | 09:36 |
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| oanson | dimak, we raised the possibly of using src IP last week. But it's... less elegant | 09:37 |
| dimak | that 64k macs per source port | 09:37 |
| irenab | oanson, admin setups network vnis and expects number of network to be supported | 09:37 |
| dimak | oh, sorry, I didn't follow that discussion | 09:37 |
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| oanson | yuli_s, how is it solved in TAPaaS reference implementation? | 09:38 |
| irenab | if we get Tap Service vnis from the same pool, the number of networks will decrease | 09:38 |
| yuli_s | oanson, I will check | 09:38 |
| oanson | irenab, won't separating them cause a deployment and configuration overhead? Including more pain points? | 09:38 |
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| xiaohhui | irenab, the segment is associated with network, one network might have multiple segments, so they don't have to be same number | 09:38 |
| irenab | oanson, Tap is service, it maybe enabled or not, it can come with its own configuration | 09:39 |
| oanson | irenab, yes. But then it is possible there are no free segment IDs for it. All were taken for networks | 09:40 |
| irenab | oanson, if its separate pool, this will not happen | 09:40 |
| oanson | I guess we could support both options. But that makes things worse :) | 09:40 |
| oanson | irenab, I mean the network segment ID pool takes up the entire e.g. 24 bits | 09:41 |
| irenab | another question is how the Virtual Topology will look like | 09:41 |
| oanson | irenab, what do you mean? | 09:41 |
| irenab | oanson, in ML2 VXLAN driver, admin specifies the ranges to allocate from | 09:42 |
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| irenab | oanson, TAP Service is port on some neutron network, but it gets another network segment | 09:42 |
| oanson | irenab, yes. But he can specify the whole range. He has to know about it TaaS needing VNIs, or modify the range later | 09:43 |
| irenab | oanson, tap can fallback to neutron range if there is not dedicated one | 09:43 |
| oanson | irenab, that sounds good | 09:44 |
| oanson | That's what I mean when I said support both options. | 09:44 |
| oanson | Is this acceptable by everyone? | 09:44 |
| irenab | oanson, yuli_s But I still do not quite see how Tap Service is prefented in Virtual Topology | 09:45 |
| irenab | we can discuss it over spec | 09:45 |
| oanson | irenab, I'm sorry, I'm not sure I understand 'Virtual Topology'. What is it? | 09:45 |
| irenab | think of Topology view in Horizon | 09:46 |
| oanson | I'll admit, I don't remember the last time I was in horizon :) | 09:46 |
| irenab | lets take it offline :-) | 09:46 |
| oanson | But that sounds like something with the Neutron API, not Dragonflow. | 09:47 |
| oanson | irenab, sure | 09:47 |
| oanson | Everyone happy with the segment IDs solution? | 09:47 |
| oanson | Great. yuli_s, please verify what TAPaaS reference implementation did so that we have a basis for comparison. | 09:47 |
| yuli_s | sure | 09:48 |
| oanson | Thanks | 09:48 |
| oanson | sNAT - ishafran, anything to update? | 09:48 |
| ishafran | I am working on POC | 09:48 |
| yamamoto | irenab: https://review.openstack.org/#/c/396022/ | 09:48 |
| ishafran | Facing problem with NAT implementation in OVS | 09:49 |
| oanson | yamamoto, thanks | 09:49 |
| ishafran | I am going to ask in OVS discuss group regarding this issue | 09:49 |
| oanson | ishafran, sounds good. | 09:50 |
| oanson | Anything else for roadmap? | 09:50 |
| oanson | #topic Open Issues | 09:51 |
| *** openstack changes topic to "Open Issues (Meeting topic: Dragonflow)" | 09:51 | |
| oanson | The floor is for the taking | 09:51 |
| oanson | Just bring it back when you're done :) | 09:51 |
| xiaohhui | I want to present this solution for multi-tenants in topology | 09:51 |
| xiaohhui | https://review.openstack.org/#/c/414697/ | 09:51 |
| xiaohhui | I meant selective topology distribution | 09:51 |
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| dimak | I'll go over it today | 09:52 |
| xiaohhui | There are 2 options, I want to hear your opinions | 09:52 |
| xiaohhui | thanks dimak | 09:52 |
| oanson | xiaohhui, I'll go over it too | 09:52 |
| xiaohhui | thank you too oanson | 09:52 |
| oanson | :) | 09:52 |
| oanson | Anything else? | 09:53 |
| xiaohhui | Nothing from me | 09:53 |
| oanson | It's a grade A floor. Only drawback is that it's virtual. | 09:53 |
| oanson | All right. Thanks everyone. | 09:54 |
| dimak | Good bye! | 09:54 |
| yuli_s | thanks ! | 09:54 |
| oanson | Don't forget tomorrow 8:30 for the NB refactor discussion if you want to join | 09:54 |
| oanson | #endmeeting | 09:54 |
| *** openstack changes topic to "OpenStack Meetings || https://wiki.openstack.org/wiki/Meetings" | 09:54 | |
| openstack | Meeting ended Mon Dec 26 09:54:53 2016 UTC. Information about MeetBot at http://wiki.debian.org/MeetBot . (v 0.1.4) | 09:54 |
| openstack | Minutes: http://eavesdrop.openstack.org/meetings/dragonflow/2016/dragonflow.2016-12-26-09.00.html | 09:54 |
| openstack | Minutes (text): http://eavesdrop.openstack.org/meetings/dragonflow/2016/dragonflow.2016-12-26-09.00.txt | 09:54 |
| openstack | Log: http://eavesdrop.openstack.org/meetings/dragonflow/2016/dragonflow.2016-12-26-09.00.log.html | 09:54 |
| dimak | openstack, where? | 09:55 |
| dimak | oanson, where? | 09:55 |
| dimak | df channel? | 09:55 |
| oanson | yes | 09:55 |
| oanson | #openstack-dragonflow | 09:55 |
| dimak | great | 09:56 |
| yamamoto | which tz? | 09:56 |
| nick-ma_ | Ok | 09:56 |
| oanson | UTC | 09:56 |
| oanson | yamamoto, UTC | 09:56 |
| yamamoto | ok thx | 09:56 |
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