[dpdk-dev] [PATCH v2] net/iavf: enable interrupt polling

[Kadam, Pallavi]

On 8/25/2021 1:34 AM, Robin Zhang wrote:
> For VF hosted by Intel 700 series NICs, internal rx interrupt and adminq
> interrupt share the same source, that cause a lot cpu cycles be wasted on
> interrupt handler on rx path.
>
> The patch disable pci interrupt and remove the interrupt handler, replace
> it with a low frequency(50ms) interrupt polling daemon which is
> implemtented by registering an alarm callback periodly.
>
> The virtual channel capability bit VIRTCHNL_VF_OFFLOAD_WB_ON_ITR can be
> used to negotiate if iavf PMD needs to enable background alarm or not, so
> ideally this change will not impact the case hosted by Intel 800 series
> NICS.
>
> This patch implements the same logic with an early i40e commit:
> commit 864a800d706d ("net/i40e: remove VF interrupt handler")
>
> Signed-off-by: Robin Zhang <robinx.zhang at intel.com>
>
> v2:
> - only enable interrupt polling for VF of i40e devices.
>
> ---
Acked-by: Pallavi Kadam <pallavi.kadam at intel.com>