[RFC PATCH 05/10] qemu_capabilities: Added capability for qemu's "ebpf_rss_fds".

[Michal Prívozník]

On 7/28/21 10:17 AM, Andrew Melnychenko wrote:
> Added check for qemu virtio-net "ebpf_rss_fds" property.
> This property allows to pass eBPF program/map file descriptors for RSS program.
> In other patches, libvirt may launch qemu-ebpf-rss-helper and pass fds
> to virtio-net qemu.
> 
> Signed-off-by: Andrew Melnychenko <andrew at daynix.com>
> ---
>  src/qemu/qemu_capabilities.c | 2 ++
>  src/qemu/qemu_capabilities.h | 1 +
>  2 files changed, 3 insertions(+)
> 
> diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
> index 7cd6dab259..f16115226d 100644
> --- a/src/qemu/qemu_capabilities.c
> +++ b/src/qemu/qemu_capabilities.c
> @@ -638,6 +638,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
>                "query-display-options",
>                "s390-pv-guest",
>                "virtio-net.rss",
> +              "virtio-net.ebpf_rss_fds",
>      );
>  
>  
> @@ -1423,6 +1424,7 @@ static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsVirtioNet[] = {
>      { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES, NULL },
>      { "acpi-index", QEMU_CAPS_ACPI_INDEX, NULL },
>      { "rss", QEMU_CAPS_VIRTIO_RSS, NULL },
> +    { "ebpf_rss_fds", QEMU_CAPS_VIRTIO_EBPF_RSS_FDS, NULL },

I haven't found this in QEMU. Looking into qemu-devel list it was
proposed but apparently is not merged yet:

https://lists.nongnu.org/archive/html/qemu-devel/2021-07/msg03536.html

>  };
>  
>  static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsPCIeRootPort[] = {
> diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
> index 6b2446fe5f..c938b63e91 100644
> --- a/src/qemu/qemu_capabilities.h
> +++ b/src/qemu/qemu_capabilities.h
> @@ -618,6 +618,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
>      QEMU_CAPS_QUERY_DISPLAY_OPTIONS, /* 'query-display-options' qmp command present */
>      QEMU_CAPS_S390_PV_GUEST, /* -object s390-pv-guest,... */
>      QEMU_CAPS_VIRTIO_RSS, /* virtio-net rss feature */
> +    QEMU_CAPS_VIRTIO_EBPF_RSS_FDS, /* virtio-net ebpf_rss_fds feature */
>  
>      QEMU_CAPS_LAST /* this must always be the last item */
>  } virQEMUCapsFlags;
>