Difference between revisions of "PCI passthrough SRIOV support"

Revision as of 09:09, 21 November 2013

the grouping implemtation is generic, not only for SRIOV, and flexible.

Requements from SRIOV

• group device

  for SRIOV, all VFs belong to same PF share same physical network reachability. so if you want, say, deploy a vlan network, you need choose the right PF's VF, otherwise network does not work for you.

• tracking device alloced to the NIC

  networking or other special deive is not as simple as pass though to the VM, there is need more configration. to acheive this, SRIOV must know the device infomation allocation to the specific NIC.

group the devices

  spec: a filter defined by (k,v) paris
  extra_spec: the filter defined by (k, v) and k not in the pci object fileds. 

pci utils/objects support grouping

      * pci utils k,v match support the list values
      * objects provide a class level extrac interface to extract base spec and extra spec

white list import address set

      * white list support 'address':[bdf1, ....]
      * white list support  any other (k,v) pair to group or store special infomation 
      * object extrac specs and extra_info, specs use as whitelist spec, extra info will be updated to device's extra_info fields

enable alias request extra property

      * alis can specify extra (k,v) pairs 
      * pci manager use extrac method extrac the specs and extra_specs, match them agains  the pci object  object.extra_info.

pci stats grouping device on demand

        * pci_grouping_key configration option define a set of key name which will used to group the device to stats
        * default value is  [vendor_id, product_id], this current implemtation
        * limited support to 3 keys grouping for algorithm simplicity.

tracking device allocated to alias

use request append infomation to alloced device then find if by (k,v)

API for whitelist

DB for pci configration

  talbe: pci_configration{
                  object:
                  host: 
                  k:
                  v:
            }

   alias and on-demand group key is  global.

PCI releated Objects

  Objects: white list/ alias/ group keys(on demand grop)
  objects property:  sets of k,v
   

API interface

   GET/object-name:  get predefined keys: like vendor/produect/address
   GET/objet-name/key: get key value in the DB
   PUT/object-name/ k=v:  set pre define or extra k,v to objects