[spp] Proposal - spp_vf(SR-IOV like feature) addition to SPP

[Ferruh Yigit]

On 12/25/2017 4:41 AM, Nakamura Hioryuki wrote:
> Hi everyone,
> 
> As announced in DPDK Summit, we would like to introduce a SR-IOV like network 
> functionality to SPP on DPDK17.08[1].
> 
> To support such functionality, we have developed new 
> controller(spp_vf.py) and secondary process(spp_vf).
> 
> spp_vf process has three kinds of component, classifier, forwarder and merger.
> These components communicate each other via ring-pmd, 
> and provides SR-IOV like packet classification function according to virtual 
> MAC address.
> 
> Classifier:
> This component provides packet forwarding function from one port to one port.
> Classifier has table of virtual MAC address.
> According to this table, classifier lookups L2 destination MAC address
> and determines which port to be transferred to incoming packets.
> L2 Multicast feature is also supported. 
> 
> Forwarder:
> This provides function for packet processing from one port to one port.
> Incoming packets from port are to be transferred to specific one port.
> The direction of this transferring is specified by `port` command.
> 
> Merger:
> This component provides packet forwarding function from multiple ports to one port.
> Incoming packets from multiple ports are to be transferred to one specific port.
> The flow of this merging process is specified by `port` command.
> 
> By the combination of these component, following SR-IOV like function can be configured.
> 
>                    +----------+           +-----------+
>                    |Classifier|->ringPMD->|Forwarder#1|->vhost->VM#1 --------+
> Packet(dstMAC:A/B) |          |           +-----------+         (vMAC:A)     |
> ------phy--------> |          |           +-----------+                      |
>                    |          |->ringPMD->|Forwarder#2|->vhost->VM#2 ---+    |
>                    |          |           +-----------+         (vMAC:B)|    |
>                    +----------+                                         |    |
>                                                                         |    |
>                    +----------+           +-----------+                 |    |
>                    |Merger    |<-ringPMD<-|Forwarder#3|<-vhost --==----------+
>                    |          |           +-----------+                 |
>  <------phy--------|          |           +-----------+                 |
>                    |          |<-ringPMD<-|Forwarder#4|<-vhost ---------+
>                    +----------+           +-----------+ 
> 
> Limitaion#1: vlan support is not yet, this feature is in still our backlogs.
> Limitaion#2: Support DPDK17.11 is not yet.
>                    
> Code changes will be posted in the following emails.

Series applied, thanks.