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OPI Storage APIs

Demos

see https://github.com/opiproject/opi-poc/tree/main/demos/storage

Clients

see https://github.com/opiproject/pydpu and https://github.com/opiproject/godpu

Reference implementations

All implementations above are reference only and not meant to be used as-is in production

Storage API sub-group Goals & Deliverables

Objectives

  • The objective is to define an industry standard “OPI Storage Interface” for IPUs/DPUs.
  • This industry standard will enable DPU vendors to develop a plugin once and have it work across a number of orchestration systems.
  • The Storage solution is one part of a higher-level architecture API defined for IPUs/DPUs in OPI.

Deliverables

  • OPI defines protobuf definitions that every HW or SW vendor can implement easily using their SDKs
  • OPI provides bridge implementation for SPDK because many (not all) companies use SPDK
  • OPI provides CSI-OPI driver to hook into k8s
  • OPI provides cli based proto client that can send gRPC protobuf messages to DPUs and IPUs for storage defined in the spec above

All implementations above are reference only and not meant to be used as-is in production

Not goals

  • OPI storage workstream will not define what workload will run on the exposed devices
  • OPI storage workstream will not define nor replace vendors SDKs
  • OPI storage workstream will not define how vendors implement gRPC protobuf bridges to their SDKs and cards
  • OPI storage workstream will not define how those APIs packaged, deployed, installed, updated and managed
  • OPI storage workstream will not define explicit complete defininitive list of storage protocols and accelerators
  • OPI storage workstream will not prohibit vendors plugins and extensions

Implementation

Compile it as:

docker run --user=$$(id -u):$$(id -g) --rm -v "${PWD}":/defs namely/protoc-all:1.51_2 -i /common --lint -d v1alpha1 -l go -o ./v1alpha1/gen/go/  --go-source-relative

Linter it as:

docker run --user=$$(id -u):$$(id -g) --rm --entrypoint=sh -v "${PWD}"/v1alpha1/:/out -w /out ghcr.io/docker-multiarch/google-api-linter:1.57.0 -c "api-linter -I /common /out/*.proto --output-format github --set-exit-status"

Additional linter:

docker run --rm -it -v /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem:/etc/ssl/certs/ca-certificates.crt -v "$(pwd):/workspace" -w /workspace bufbuild/buf lint

Generate docs as:

docker run --user=$$(id -u):$$(id -g) --rm --entrypoint=sh -v "${PWD}"/v1alpha1/:/out -w /out -v "${PWD}"/v1alpha1:/protos pseudomuto/protoc-gen-doc:1.5.1 -c "protoc -I /common -I /protos --doc_out=/out --doc_opt=markdown,autogen.md /protos/*.proto"

Test your APIs even if unmerged using your private fork like this:

chmod a+w go.*
docker run --rm -it -v `pwd`:/app -w /app golang:alpine go mod edit -replace github.com/opiproject/opi-api@main=github.com/YOURUSERNAME/opi-api@main
docker run --rm -it -e GO111MODULE=on -v `pwd`:/app -w /app golang:alpine go get -u github.com/YOURUSERNAME/opi-api/storage/v1alpha1/gen/go@a98ca449468a

Documentation for reference of other specs

Common APIs abstraction layer

OPI Common APIs and SHIM abstraction layer

Storage Example use case

  • Initiator server has a xPU connected to a switch
  • xPU handles NVMeoF connection to some remote Network Storage Array on the same network switch
  • xPU exposes some emulated interface to host ( Nvme, Virtio-blk, ... )
  • xPU handles authentication and encryption as well
  • Host is unaware that storage is not local

Storage Services Offload Use Case

Terminology

Term Definition
Host A physical server where xPU is plugged over PCIe and powered.
Block Volume A volume that will appear as a block device inside the host OS.
NVMe Subsystem holding all other objects in NVMe world
NVMe Controller responsible for Queues and Commands handlings. Have to belong to some subsystem.
NVMe Namespac representing remote namespace. Belongs to a specific controller (private NS) or shared between controllers (usually for Multipathing).
tbd tbd

Storage APIs

  • All storage APIs are following CRUD model (CREATE, READ, UPDATE, and DELETE)
  • All storage APIs are gRPC based with protobuf definitions that can compile to many languages
  • All storage APIs must have statistics for observability on every level and set
  • We identified 3 sets of APIs in Storage:
    • Front End
      • Those are host facing APIs
      • Examples are emulated NVMe devices, Virtio-blk, Virtio-scsi and other block devices
      • The APIs will have all the required properties for NVMe/Vritio specs
      • Object and FS are also considered as part of the scope
    • Middle End
      • Those are storage services APIs
      • They are implemented in DPU and provide with additional storage services (if applicable)
      • Few example: Raid protection, Compression, Encryption, Multipathing, QoS, and others...
    • Back End
      • Those are network facing APIs
      • DPU connects to those devices locally (i.e. pcie) or remotely on the network (iSCSI, RDMA, TCP, IPv4, IPv6, Ceph, S3, NFS, and others...)
      • We do want few devices for debug (null, malloc, delay, error injection)
      • We do want authentication and security while connecing over network (Chap, TLS, IPSEC, ...)
      • Similar to what nvme-connect provides, for example (in a very simplistic way)
  • Security
    • We do want to do security
    • For example: CHAP or AVE for iSCSI and NVMe/TCP for authentication
    • For example: NVMe/TLS 1.3 or IPSEC for secure channel (similar for iscsi)
    • We are not considering at this time encrypting PCIe link (emulated devides over PFs and VFs), this might come later on
    • For implementation limitations we are not starting with those, but they are in design considerations
  • Alternative Implementations
    • There are several existing implementations to consider (CSI, SMA, ...)

Mindmap Diagram

mindmap
    root((Device))
        Front End to host
            NVMe
                NVMe Subsystem
                NVMe Controller
                NVMe Namespace
            VirtIO scsi
                tbd
            VirtIO fs
                tbd
            VirtIO blk
                VirtIO blk Controller
                VirtIO blk Volume
        Middle End Storage Services
            Compression
            RAID across storage backends
            DARE Data at Rest Encryption
            QoS Min and Max Iops and BW
            others...
        BackEnd to fabric
            NVMe
                PCIe
                TCP
                    ipv4
                    ipv6
                RDMA
                    ipv4
                    ipv6
            iSCSI
                ipv4
                ipv6
            Null
            AIO
            Memory
        System
            telemetry
            log
             statsistics
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