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 | n f p | s f c |
---|---|---|---|---|
csum | Y | Y | ||
guest csum | Y | Y | ||
mac | ||||
gso | ||||
guest tso4 | ||||
guest tso6 | ||||
ecn | ||||
ufo | ||||
host tso4 | Y | Y | ||
host tso6 | Y | Y | ||
mrg rxbuf | Y | |||
ctrl vq | ||||
ctrl rx | ||||
any layout | Y | Y | ||
guest announce | Y | |||
mq | Y | |||
version 1 | Y | Y | ||
log all | Y | |||
indirect desc | ||||
event idx | ||||
mtu | Y | |||
in_order | Y | |||
IOMMU platform | Y | |||
packed | Y | |||
proto mq | Y | |||
proto log shmfd | Y | |||
proto rarp | ||||
proto reply ack | ||||
proto host notifier | Y | Y | ||
proto pagefault | ||||
queue statistics | Y | |||
FreeBSD | ||||
Linux | Y | Y | Y | |
ARMv7 | ||||
ARMv8 | Y | |||
Power8 | Y | |||
x86-32 | Y | Y | ||
x86-64 | Y | Y | Y | Y |
Usage doc | Y | 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.