1. Overview of vDPA Drivers Features
This section explains the supported features that are listed in the table below.
- csum
- Device can handle packets with partial checksum.
- guest csum
- Guest can handle packets with partial checksum.
- mac
- Device has given MAC address.
- gso
- Device can handle packets with any GSO type.
- guest tso4
- Guest can receive TSOv4.
- guest tso6
- Guest can receive TSOv6.
- ecn
- Device can receive TSO with ECN.
- ufo
- Device can receive UFO.
- host tso4
- Device can receive TSOv4.
- host tso6
- Device can receive TSOv6.
- mrg rxbuf
- Guest can merge receive buffers.
- ctrl vq
- Control channel is available.
- ctrl rx
- Control channel RX mode support.
- any layout
- Device can handle any descriptor layout.
- guest announce
- Guest can send gratuitous packets.
- mq
- Device supports Receive Flow Steering.
- version 1
- v1.0 compliant.
- log all
- Device can log all write descriptors (live migration).
- indirect desc
- Indirect buffer descriptors support.
- event idx
- Support for avail_idx and used_idx fields.
- mtu
- Host can advise the guest with its maximum supported MTU.
- in_order
- Device can use descriptors in ring order.
- IOMMU platform
- Device support IOMMU addresses.
- packed
- Device support packed virtio queues.
- proto mq
- Support the number of queues query.
- proto log shmfd
- Guest support setting log base.
- proto rarp
- Host can broadcast a fake RARP after live migration.
- proto reply ack
- Host support requested operation status ack.
- proto host notifier
- Host can register memory region based host notifiers.
- proto pagefault
- Slave expose page-fault FD for migration process.
- queue statistics
- Support virtio queue statistics query.
- FreeBSD
- Support FreeBSD.
- Linux
- Support Linux.
- ARMv7
- Support armv7 architecture.
- ARMv8
- Support armv8a (64bit) architecture.
- Power8
- Support PowerPC architecture.
- x86-32
- Support 32bits x86 architecture.
- x86-64
- Support 64bits x86 architecture.
- Usage doc
- Documentation describes usage, In
doc/guides/vdpadevs/. - Design doc
- Documentation describes design. In
doc/guides/vdpadevs/. - Perf doc
- Documentation describes performance values, In
doc/perf/.
Note
Most of the features capabilities should be provided by the drivers via the
next vDPA operations: get_features and get_protocol_features.
3. Features Table
| Feature | i f c v f | m l x 5 |
|---|---|---|
| csum | Y | |
| guest csum | Y | |
| mac | ||
| gso | ||
| guest tso4 | ||
| guest tso6 | ||
| ecn | ||
| ufo | ||
| host tso4 | Y | |
| host tso6 | Y | |
| mrg rxbuf | ||
| ctrl vq | ||
| ctrl rx | ||
| any layout | Y | |
| guest announce | Y | |
| mq | Y | |
| version 1 | Y | |
| log all | Y | |
| indirect desc | ||
| event idx | ||
| mtu | Y | |
| in_order | ||
| IOMMU platform | ||
| packed | Y | |
| proto mq | Y | |
| proto log shmfd | Y | |
| proto rarp | ||
| proto reply ack | ||
| proto host notifier | Y | |
| proto pagefault | ||
| queue statistics | Y | |
| FreeBSD | ||
| Linux | Y | |
| ARMv7 | ||
| ARMv8 | Y | |
| Power8 | Y | |
| x86-32 | Y | Y |
| x86-64 | Y | Y |
| Usage doc | Y | |
| Design doc | Y | |
| Perf doc |
Note
Features marked with “P” are partially supported. Refer to the appropriate driver guide in the following sections for details.