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<div>Hi Yongli,</div>
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<div>Please also see my response to Yunhong. Here, I just want to add a comment about your local versus global argument. I took a brief look at your patches, and the PCI-flavor is added into the whitelist. The compute node needs to know these pci-flavors in
order to report PCI stats based on them. Please correct me if I'm wrong. </div>
<div><br>
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<div>Another comment is that a compute node doesn't need to consult with the controller, but it's report or registration of resources may be rejected by the controller due to non-existing PCI groups. </div>
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<div>thanks,</div>
<div>Robert</div>
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<div>On 1/10/14 2:11 AM, "yongli he" <<a href="mailto:yongli.he@intel.com">yongli.he@intel.com</a>> wrote:</div>
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<div class="moz-cite-prefix">On 2014¦~01¤ë10¤é 00:49, Robert Li (baoli) wrote:<br>
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<p class="MsoNormal"><span style="font-family: Calibri, sans-serif; font-size: 14px; ">Hi Folks,</span></p>
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HI, all<br>
<br>
basiclly i flavor the pic-flavor style and against massing the white-list. please see my inline comments.
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<div>With John joining the IRC, so far, we had a couple of productive meetings in an effort to come to consensus and move forward. Thanks John for doing that, and I appreciate everyone's effort to make it to the daily meeting. Let's reconvene on Monday. </div>
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<div>But before that, and based on our today's conversation on IRC, I'd like to say a few things. I think that first of all, we need to get agreement on the terminologies that we are using so far. With the current nova PCI passthrough</div>
<div><br>
</div>
<div> PCI whitelist: defines all the available PCI passthrough devices on a compute node. <span style="background-color: rgb(245, 245, 245); color: rgb(51, 51, 51); font-family: Monaco, Menlo, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 20px; white-space: pre-wrap; ">pci_passthrough_whitelist=[{
"vendor_id":"xxxx","product_id":"xxxx"}] </span></div>
<div> PCI Alias: criteria defined on the controller node with which requested PCI passthrough devices can be selected from all the PCI passthrough devices available in a cloud. </div>
<div> Currently it has the following format: <span style="background-color: rgb(245, 245, 245); color: rgb(51, 51, 51); font-family: Monaco, Menlo, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 20px; white-space: pre-wrap; ">pci_alias={"vendor_id":"xxxx",
"product_id":"xxxx", "name":"str"}</span></div>
<div> </div>
<div> nova flavor extra_specs: request for PCI passthrough devices can be specified with extra_specs in the format for example:<span style="background-color: rgb(245, 245, 245); color: rgb(51, 51, 51); font-family: Monaco, Menlo, Consolas, 'Courier New', monospace; font-size: 13px; line-height: 20px; white-space: pre-wrap; ">"pci_passthrough:alias"="name:count"</span></div>
<div><br>
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<div>As you can see, currently a PCI alias has a name and is defined on the controller. The implications for it is that when matching it against the PCI devices, it has to match the vendor_id and product_id against all the available PCI devices until one is
found. The name is only used for reference in the extra_specs. On the other hand, the whitelist is basically the same as the alias without a name.</div>
<div><br>
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<div>What we have discussed so far is based on something called PCI groups (or PCI flavors as Yongli puts it). Without introducing other complexities, and with a little change of the above representation, we will have something like:</div>
<div> </div>
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"name":"str"}] </span></div>
<div><br>
</div>
<div>By doing so, we eliminated the PCI alias. And we call the "name" in above as a PCI group name. You can think of it as combining the definitions of the existing whitelist and PCI alias. And believe it or not, a PCI group is actually a PCI alias. However,
with that change of thinking, a lot of </div>
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the white list configuration is mostly local to a host, so only address in there, like John's proposal is good. mix the group into the whitelist means we make the global thing per host style, this is maybe wrong.
<br>
<br>
<blockquote cite="mid:CEF41940.362F5%25baoli@cisco.com" type="cite">
<div>benefits can be harvested:</div>
<div><br>
</div>
<div> * the implementation is significantly simplified</div>
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but more mass, refer my new patches already sent out.<br>
<blockquote cite="mid:CEF41940.362F5%25baoli@cisco.com" type="cite">
<div> * provisioning is simplified by eliminating the PCI alias</div>
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pci alias provide a good way to define a global reference-able name for PCI, we need this, this is also true for John's pci-flavor.<br>
<blockquote cite="mid:CEF41940.362F5%25baoli@cisco.com" type="cite">
<div> * a compute node only needs to report stats with something like: PCI group name:count. A compute node processes all the PCI passthrough devices against the whitelist, and assign a PCI group based on the whitelist definition.</div>
</blockquote>
simplify this seems like good, but it does not, separated the local and global is the instinct nature simplify.<br>
<blockquote cite="mid:CEF41940.362F5%25baoli@cisco.com" type="cite">
<div> * on the controller, we may only need to define the PCI group names. if we use a nova api to define PCI groups (could be private or public, for example), one potential benefit, among other things (validation, etc), they can be owned by the tenant
that creates them. And thus a wholesale of PCI passthrough devices is also possible.</div>
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this mean you should consult the controller to deploy your host, if we keep white-list local, we simplify the deploy.<br>
<blockquote cite="mid:CEF41940.362F5%25baoli@cisco.com" type="cite">
<div> * scheduler only works with PCI group names. </div>
<div> * request for PCI passthrough device is based on PCI-group</div>
<div> * deployers can provision the cloud based on the PCI groups</div>
<div> * Particularly for SRIOV, deployers can design SRIOV PCI groups based on network connectivities.</div>
<div><br>
</div>
<div>Further, to support SRIOV, we are saying that PCI group names not only can be used in the extra specs, it can also be used in the ¡Xnic option and the neutron commands. This allows the most flexibilities and functionalities afforded by SRIOV.</div>
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i still feel use alias/pci flavor is better solution.<br>
<blockquote cite="mid:CEF41940.362F5%25baoli@cisco.com" type="cite">
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<div>Further, we are saying that we can define default PCI groups based on the PCI device's class.</div>
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default grouping make our conceptual model more mass, pre-define a global thing in API and your hard code is not good way, i post -2 for this.<br>
<blockquote cite="mid:CEF41940.362F5%25baoli@cisco.com" type="cite">
<div><br>
</div>
<div>For vnic-type (or nic-type), we are saying that it defines the link characteristics of the nic that is attached to a VM: a nic that's connected to a virtual switch, a nic that is connected to a physical switch, or a nic that is connected to a physical
switch, but has a host macvtap device in between. The actual names of the choices are not important here, and can be debated.</div>
<div><br>
</div>
<div>I'm hoping that we can go over the above on Monday. But any comments are welcome by email.</div>
<div><br>
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<div>Thanks,</div>
<div>Robert</div>
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