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| mlavalle | #startmeeting neutron_drivers | 14:00 |
|---|---|---|
| openstack | Meeting started Fri Jul 12 14:00:07 2019 UTC and is due to finish in 60 minutes. The chair is mlavalle. Information about MeetBot at http://wiki.debian.org/MeetBot. | 14:00 |
| openstack | Useful Commands: #action #agreed #help #info #idea #link #topic #startvote. | 14:00 |
| *** openstack changes topic to " (Meeting topic: neutron_drivers)" | 14:00 | |
| openstack | The meeting name has been set to 'neutron_drivers' | 14:00 |
| njohnston | o/ | 14:00 |
| amotoki | hi | 14:01 |
| mlavalle | Yamamoto underwent surgery recently, so he won't attend today's meeting | 14:02 |
| *** davidsha has joined #openstack-meeting | 14:02 | |
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| haleyb | hi | 14:03 |
| adrianc | Hi | 14:03 |
| davidsha | Hey | 14:03 |
| slaweq | hi | 14:03 |
| njohnston | mlavalle: Goodness I hope it was nothing serious | 14:03 |
| mlavalle | he wrote an email, so he seems to be ok | 14:04 |
| mlavalle | for those interested to know, my wife's kidney transplant was a total suceess yesterday | 14:05 |
| njohnston | \o/ | 14:05 |
| slaweq | great news :) | 14:05 |
| mlavalle | and with that, let's get going | 14:05 |
| amotoki | :) | 14:05 |
| mlavalle | #topic RFEs | 14:05 |
| *** openstack changes topic to "RFEs (Meeting topic: neutron_drivers)" | 14:05 | |
| mlavalle | today we are going to discuss 2 submissions from adrianc | 14:06 |
| mlavalle | They are closely related. Let's start with https://bugs.launchpad.net/neutron/+bug/1834174 | 14:06 |
| openstack | Launchpad bug 1834174 in neutron "[RFE] Add support for IPoIB interface driver" [Wishlist,In progress] - Assigned to Adrian Chiris (adrian.chiris) | 14:06 |
| mlavalle | and this is the related PoC code: https://review.opendev.org/668510 | 14:08 |
| slaweq | I wrote a comment in this rfe today | 14:08 |
| slaweq | I would like others opinion about it :) | 14:08 |
| slaweq | especially about point related to testing it in u/s | 14:08 |
| njohnston | So in this case L3 is IP, and L2 is InfiniBand instead of Ethernet, and would require not just Infiniband cards in the machine stesting it but also a TOR that supports InfiniBand protocol, yes? | 14:09 |
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| amotoki | this RFE only mentions DHCP and L3 agents. how about nova side? Is IB used for compute nodes too? | 14:10 |
| adrianc | slaweq: in regards to testing i was thinking about unit-tests and possibly adding a test to run on Mellanox CI | 14:10 |
| adrianc | amotoki: yes , with SR-IOV | 14:11 |
| amotoki | njohnston: Infinibad fabric would be used instead of usual ToR ethernet switches. | 14:11 |
| amotoki | adrianc: so, do you need nova change too? | 14:11 |
| adrianc | its basically passthrough of SR-IOV to the VM so its already supported in nova | 14:12 |
| adrianc | the L2 wiring is done via vendor specific driver | 14:12 |
| adrianc | https://github.com/openstack/networking-mlnx | 14:12 |
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| adrianc | at high level in contrast to the L2 wiring (pkey configurations - which is the equivalent of vlan) | 14:14 |
| adrianc | the creation of IPoIB interfaces is somthing that is upstream in linux | 14:14 |
| njohnston | So why does this code need to be in Neutron as opposed to networking-mlnx? Help me understand. | 14:15 |
| amotoki | same question hits me | 14:15 |
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| amotoki | I have an example from midonet. networking-midonet has its own interface driver https://github.com/openstack/networking-midonet/blob/master/setup.cfg#L73-L74 | 14:16 |
| amotoki | (I am not familiar with it though) | 14:17 |
| adrianc | well, it can be, but in contrast to the L2 wiring, there is only one way of creating an IPoIB interface. | 14:17 |
| adrianc | i agree that in its own the interface driver would be incomplete without an L2 entity (L2 agent) to configure it. | 14:17 |
| mlavalle | so IPoIB is a standard: https://tools.ietf.org/html/rfc4392 | 14:20 |
| mlavalle | and it seems you are suggesting that implementing it might be useful for other infiniband vendors. Am I understanding correctly? | 14:21 |
| adrianc | i have no strong objection in putting it as part of networking-mlnx however if another infiniband vendor comes along, he will probably need to use the same interface driver | 14:21 |
| adrianc | slow typer :) | 14:22 |
| adrianc | mlavalle that is correct | 14:22 |
| njohnston | My only issue is that upstream gates will never have the hardware to test this effectively | 14:22 |
| amotoki | Looking at https://review.opendev.org/668510, this has two points: the one is a new interface driver for IPoIB and the second is a change in the interface driver interface (i.e. to pass segmentation_id) | 14:23 |
| mlavalle | do we have any evidence that there is interest from other IB vendors at this time? | 14:23 |
| njohnston | Which is something that can be understood and passed over if there is a compelling reason why this part of the code has to be in the neutron repo, and can't be in networking-mlnx where the proper kinds of CI can be specified | 14:23 |
| adrianc | amotoki: yes current kernel API is to provide the pkey (segmentation_id in our case) when creating the interface | 14:23 |
| slaweq | njohnston++ | 14:23 |
| amotoki | adrianc: what is 'pkey'? | 14:24 |
| amotoki | primary key? | 14:24 |
| adrianc | infiniband's equivalent to vlan | 14:24 |
| adrianc | partition key | 14:24 |
| slaweq | adrianc: so in case when this driver is used, on host where L3/DHCP agent is running there is no any L2 agent? | 14:24 |
| slaweq | which could manage e.g. segmentation_id | 14:24 |
| slaweq | like it is in case of "standard" openvswitch driver for example | 14:24 |
| adrianc | IPoIB interface is similar to macvtap , where you create multiple interfaces on the same physical netdev | 14:25 |
| adrianc | slaweq: there is an L2 agent, someone needs to do the L2 configurations | 14:26 |
| slaweq | adrianc: so why we need to pass segmentation_id to this driver than? | 14:26 |
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| adrianc | the current kernel API requires you to set it during interface creation | 14:27 |
| adrianc | (iproute command) | 14:27 |
| slaweq | ahh, I didn't know that for example :) | 14:27 |
| adrianc | njohnson: mellanox CI today runs on neutron commits | 14:27 |
| amotoki | yeah, the interface of interface driver like plug() is called by neutron agent. Who passes segmentation_id to plug_new? | 14:28 |
| adrianc | *njohnston sorry :) | 14:28 |
| slaweq | amotoki: currently this driver is used only by neutron DHCP/L3 agent to plug interfaces, everything else is done by L2 agent later in same way like for ports which belongs to vm | 14:29 |
| slaweq | in this case it will be a bit changed | 14:29 |
| amotoki | you can fetch segmentation_id inside the IPoIB driver as MultiInterface does if needed. I don't see any reason we need to change the interface so far. | 14:29 |
| adrianc | yes it can be done in the IPoIB driver in a similart fasion as MultiInterface | 14:30 |
| mlavalle | adrianc: did you see my question about evidence of other Infiniband vendors having intirest in this? | 14:30 |
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| adrianc | i did, i am not aware of other vendors | 14:31 |
| adrianc | maybe others do ? | 14:31 |
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| njohnston | adrianc: Just FYI the last time I see the Mellanox CI run on any change I am a reviewer on is July 4th, there may be an issue with it. | 14:32 |
| mlavalle | The way I see it, if there were other vendors with interest in this, it would make sense to place this new driver in a shared place, like the neutron repo | 14:32 |
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| slaweq | mlavalle: to be strict IMO shared place is neutron-lib :) | 14:32 |
| adrianc | njohnston, noted thx. will take care of it | 14:32 |
| mlavalle | slaweq: fair enough | 14:33 |
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| mlavalle | but at this point in time, I think that the best place to implement this is networking-mellanox where you have all the needed infra | 14:33 |
| mlavalle | we can even start developing a spec and invite the broader community to contribute and see if in that way we drive broader interest | 14:34 |
| njohnston | yes, you'd want a mellanox CI to be able to -2 a change in the gate queue if it would break IPoIB | 14:34 |
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| njohnston | and the best place for that is networking-mlnx | 14:35 |
| mlavalle | and if there is broader interest, then we can tackle the problem of placing the code in a shared / neutral place with the proper CI infra | 14:36 |
| adrianc | im fine with it as its unclear if there are other interested parties | 14:37 |
| mlavalle | if at any moment other parties come along, we can reconsider | 14:37 |
| mlavalle | does it make sense to everybody? | 14:37 |
| adrianc | currently im working with CSIRO on it as they have an infiniband cluster | 14:38 |
| adrianc | *infiniband openstack cluster | 14:38 |
| njohnston | +1 | 14:38 |
| slaweq | +1 | 14:39 |
| amotoki | +1 | 14:39 |
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| mlavalle | adrianc: this also pretty much applies to https://bugs.launchpad.net/neutron/+bug/1834176, right? | 14:40 |
| openstack | Launchpad bug 1834176 in neutron "[RFE] Add support for per-physnet interface driver" [Wishlist,In progress] - Assigned to Adrian Chiris (adrian.chiris) | 14:40 |
| adrianc | the main use case was enabling L3 and DHCP support for a mix of ethernet and inifiniband | 14:41 |
| mlavalle | yeap | 14:41 |
| adrianc | however to enable this the interface driver will require some knowledge of the network | 14:41 |
| adrianc | e.g in the form of RPC | 14:41 |
| adrianc | to query the physnet | 14:42 |
| adrianc | and segmentation ID for IPoIB | 14:42 |
| adrianc | today interface drivers dont have this ability | 14:42 |
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| mlavalle | but at this point, why do we need this in Neutron? | 14:43 |
| adrianc | i.e a proposed change to neutron can be to allow passing an RPC client | 14:43 |
| adrianc | so the out of tree interface driver can query the needed informatio | 14:44 |
| amotoki | adrianc: let me clarify. "the ability" you mean is to support mix use cases of ethernet and IB, or to pass more net info to an interface driver ? | 14:44 |
| slaweq | we can accept some changes required by such driver in neutron even when driver lives in other repo IMO | 14:44 |
| mlavalle | yes we can | 14:44 |
| adrianc | amotoki: MultiInterfaceDriver can be out of tree for now but it will still need that RPC | 14:45 |
| mlavalle | I am just trying to understand if we need to do it know | 14:45 |
| mlavalle | now in Neutron^^^^ | 14:45 |
| adrianc | i didnt understand the last part mlavalle | 14:45 |
| amotoki | as of now, DHCP/L3 agent takes an interface driver as its configuration, so it can take only one interface driver. | 14:46 |
| mlavalle | adrianc: in regards to the second RFE and in light of what we discussed about the first one (IPoIB), do we need the second one? | 14:46 |
| amotoki | in my understandng, adrianc tries to switch interface drivers per physnet information | 14:46 |
| amotoki | s/switch/select/ | 14:47 |
| mlavalle | yes, I understand the same | 14:47 |
| adrianc | in light of what was discussed on IPoIB, we dont need MultiInterface driver in tree, But to enable them to work they will require some information to be passed from neutron | 14:48 |
| adrianc | that is in the form of an RPC client to be able to query some network infromation | 14:49 |
| adrianc | will that be acceptable by the neutron community | 14:49 |
| mlavalle | can we repurpose / adjust the second RFE? | 14:49 |
| adrianc | yes | 14:49 |
| mlavalle | and yes, in principle it would be acceptable | 14:49 |
| mlavalle | if you adapt the second RFE, we can discuss it next week | 14:49 |
| adrianc | ok, i will adjust the second one | 14:50 |
| mlavalle | if you are willing to sacrifice a second weekend in a row | 14:50 |
| adrianc | :) no worries | 14:50 |
| mlavalle | for those of you who don't know, adrianc lives in Israel and it is weekend for him | 14:50 |
| adrianc | sunday is also a work day for me :P | 14:50 |
| mlavalle | I know that | 14:51 |
| adrianc | thx for taking the time to review the RFEs | 14:51 |
| mlavalle | adrianc: on the contrary, tyanks for your submissions | 14:52 |
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| mlavalle | Thanks everybody for attending | 14:52 |
| slaweq | thx and have a great weekend :) | 14:52 |
| mlavalle | have a great weekend or rest of your weekend | 14:53 |
| slaweq | mlavalle: and all the best for Your wife :) | 14:53 |
| amotoki | have a nice weekend ,all1 | 14:53 |
| adrianc | have a good weekend thanks | 14:53 |
| slaweq | o/ | 14:53 |
| mlavalle | slaweq: Thanks! | 14:53 |
| mlavalle | #endmeeting | 14:53 |
| *** openstack changes topic to "OpenStack Meetings || https://wiki.openstack.org/wiki/Meetings/" | 14:53 | |
| openstack | Meeting ended Fri Jul 12 14:53:22 2019 UTC. Information about MeetBot at http://wiki.debian.org/MeetBot . (v 0.1.4) | 14:53 |
| openstack | Minutes: http://eavesdrop.openstack.org/meetings/neutron_drivers/2019/neutron_drivers.2019-07-12-14.00.html | 14:53 |
| openstack | Minutes (text): http://eavesdrop.openstack.org/meetings/neutron_drivers/2019/neutron_drivers.2019-07-12-14.00.txt | 14:53 |
| openstack | Log: http://eavesdrop.openstack.org/meetings/neutron_drivers/2019/neutron_drivers.2019-07-12-14.00.log.html | 14:53 |
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