[GitHub] nvazquez opened a new pull request #3153: DPDK vHost User mode selection

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nvazquez opened a new pull request #3153: DPDK vHost User mode selection
URL: https://github.com/apache/cloudstack/pull/3153
 
 
   ## Description
   
   This feature extends the DPDK support for KVM, introduced on PR #2839. It allows:
   - Add extra configurations on service offering creation, as service offering details:
      - Keys starting with `"extraconfig"` keyword.
      - Values: URL UTF-8 encoded strings of extra configuration to be placed on the VM (XML for KVM)
      - Note: VM extra configurations take precedence over service offering extra configurations in case of collision of key names.
   
   - Add DPDK vHost User mode as a service offering details on service offering creation:
      - Key: `"DPDK-VHOSTUSER"`
      - Values: "client" or "server"
   
   Depending on the DPDK vHost User mode, the OpenvSwitch DPDK ports should be created different as well as the guest VMs interfaces:
   
   | DPDK vHost User Mode      | OVS port creation type | VM guest interface mode |
   | ----------- | ----------- | ------------- |
   | server      | dpdkvhostuser       | client |
   | client   | dpdkvhostuserclient        | server |
   
   Documentation: https://github.com/apache/cloudstack-documentation/pull/28
   
   ## Types of changes
   <!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
   - [ ] Breaking change (fix or feature that would cause existing functionality to change)
   - [x] New feature (non-breaking change which adds functionality)
   - [ ] Bug fix (non-breaking change which fixes an issue)
   - [ ] Enhancement (improves an existing feature and functionality)
   - [ ] Cleanup (Code refactoring and cleanup, that may add test cases)
   
   ## Screenshots (if appropriate):
   
   ## How Has This Been Tested?
   Tested on KVM environment with DPDK enabled hosts.

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