[RFC PATCH 00/10] VirtioNet RSS support

[Nikolay Shirokovskiy]

чт, 21 окт. 2021 г. в 01:28, Andrew Melnichenko <andrew at daynix.com>:

> Hi,
> Yes, the work is in progress. Now. I'm working with a proper solution for
> the eBPF RSS helper.
>

Ok. Thank you!



>
> On Wed, Oct 20, 2021 at 3:23 PM Nikolay Shirokovskiy <
> nshirokovskiy at virtuozzo.com> wrote:
>
>> Hi, Andrew.
>>
>> We in Virtuozzo are interested in this functionality too. Do you plan to
>> continue your work on it?
>>
>> Nikolay
>>
>> пн, 16 авг. 2021 г. в 15:00, Andrew Melnichenko <andrew at daynix.com>:
>>
>>> Ping
>>>
>>> On Wed, Jul 28, 2021 at 11:17 AM Andrew Melnychenko <andrew at daynix.com>
>>> wrote:
>>>
>>>> This series of patches add RSS property support for virtio-net-pci.
>>>>
>>>> Virtio RSS effectively works with TAP devices, it requires additional
>>>> vectors for VirtioNet, queues for TAP device, and vCPU cores.
>>>> Example of device configuration:
>>>> ```
>>>> <interface type="network">
>>>>   <mac address="52:54:00:c4:90:25"/>
>>>>   <source network="default"/>
>>>>   <model type="virtio"/>
>>>>   <driver name="qemu" queues="9" rss="on" rss_hash_report="off"/>
>>>>   <address type="pci" domain="0x0000" bus="0x01" slot="0x00"
>>>> function="0x0"/>
>>>> </interface>
>>>> ```
>>>>
>>>> Capability "rss" enables RSS, "rss_hash_report" - enables hashes in
>>>> vheader.
>>>> Qemu uses eBPF program as RSS driver.
>>>> For loading RSS eBPF program, the helper is used.
>>>> Path to the helper is provided by Qemu through "query-helper-paths" qmp
>>>> command.
>>>> The helper "qemu-ebpf-rss-helper" is built with Qemu and may differ
>>>> from build to build.
>>>> So it's required that the Qemu should provide a proper helper path.
>>>> Libvirt would call the helper and receive the program and map fd
>>>> through unix socket.
>>>> Fds would be passed to Qemu in "ebpf_rss_fds" property by passing to
>>>> child process or unix socket.
>>>> If libvirt would fail at helper call or Qemu didn't provide the path,
>>>> the Qemu would be launched without "ebpf_rss_fds" property.
>>>> Without "ebpf_rss_fds" property, Qemu would try to load eBPF program by
>>>> itself - usually, it would require additional system permissions.
>>>> Qemu may use "in-qemu" RSS as a fallback option, which will not require
>>>> system
>>>> permissions, but doesn't work with vhost TAP.
>>>>
>>>> Qemu patches:
>>>> https://lists.nongnu.org/archive/html/qemu-devel/2021-07/msg03535.html
>>>>
>>>> Andrew Melnychenko (10):
>>>>   domain_conf: Added configs for RSS and Hash report.
>>>>   qemu_capabilities: Added capabilites for qemu's "rss" and "hash".
>>>>   qemu_command: Added "rss" and "hash" properties.
>>>>   virsocket: Added receive for multiple fds.
>>>>   qemu_capabilities: Added capability for qemu's "ebpf_rss_fds".
>>>>   qemu_capabilities: Added capability for ebpf helper path.
>>>>   qemu_interface: Added ebpf helper call.
>>>>   qemu_command: Added ebpf RSS helper call for NIC creation.
>>>>   qemu_hotplug: Added helper call for hotplug NIC.
>>>>   docs: Added descriptions for "rss" and "rss_hash_report"
>>>>     configurations.
>>>>
>>>>  docs/formatdomain.rst        | 16 +++++++
>>>>  src/conf/domain_conf.c       | 31 +++++++++++++-
>>>>  src/conf/domain_conf.h       |  2 +
>>>>  src/libvirt_private.syms     |  1 +
>>>>  src/qemu/qemu_capabilities.c | 48 +++++++++++++++++++++
>>>>  src/qemu/qemu_capabilities.h |  5 +++
>>>>  src/qemu/qemu_command.c      | 46 +++++++++++++++++++-
>>>>  src/qemu/qemu_command.h      |  2 +
>>>>  src/qemu/qemu_hotplug.c      | 30 ++++++++++++-
>>>>  src/qemu/qemu_interface.c    | 54 +++++++++++++++++++++++
>>>>  src/qemu/qemu_interface.h    |  2 +
>>>>  src/qemu/qemu_monitor.c      |  9 ++++
>>>>  src/qemu/qemu_monitor.h      |  3 ++
>>>>  src/qemu/qemu_monitor_json.c | 50 ++++++++++++++++++++++
>>>>  src/qemu/qemu_monitor_json.h |  3 ++
>>>>  src/qemu/qemu_validate.c     | 16 +++++++
>>>>  src/util/virsocket.c         | 83 ++++++++++++++++++++++++++++++++++++
>>>>  src/util/virsocket.h         |  2 +
>>>>  18 files changed, 399 insertions(+), 4 deletions(-)
>>>>
>>>> --
>>>> 2.31.1
>>>>
>>>>
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