Re: Netvsc PMD : Hotplug handling : checksum offloads

[Nandini Rangaswamy <nandini.rangaswamy@broadcom.com>]

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Hi Stephen/Long,
I did some more code instrumentation and I observed that when a hotplug
add event is received, the conf is applied back to VF and offloads work as
expected.
I also observe that when VF is removed, the offloads still continue to work
as expected. Is this because the offloads are not unset when VF is removed ?
Regards,
Nandini

On Thu, Oct 24, 2024 at 9:33 AM Stephen Hemminger <
stephen@networkplumber.org> wrote:

> On Wed, 23 Oct 2024 13:34:53 -0700
> Nandini Rangaswamy <nandini.rangaswamy@broadcom.com> wrote:
>
> > Hi Stephen,
> > The code looking at checksum flags in each packet would not give us
> desired
> > performance. Instead, should the dpdk app register callbacks for hotplug
> > add and re-configure the checksum offloads when VF is added again?
> > Regards,
> > Nandini
>
> The code in hn_vf_add which is where netvsc PMD handles hot add of VF
> should be feeding the current offload settings to the VF.
>
> Maybe the rte_eth_conf being passed to VF is incorrect, or
> the configuration step there is failing. Probably need more instrumentation
> and logs to tell.
>

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