Re: Netvsc PMD : Hotplug handling : checksum offloads

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

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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

On Thu, Sep 19, 2024 at 11:47 AM Stephen Hemminger <
stephen@networkplumber.org> wrote:

> On Thu, 19 Sep 2024 11:11:44 -0700
> Nandini Rangaswamy <nandini.rangaswamy@broadcom.com> wrote:
>
> >  Hi Long/Stephen,
> > I was going through the hotplug handling code in netvsc PMD and need
> > clarification.
> > Earlier with failsafe PMD , my dpdk app used to subscribe to hotplug
> events
> > to set the checksum offloads to do software checksum calculation when VF
> > was removed and switch to H/W checksum calculation when VF was added.
> > I see even with netvsc PMD , it does not do anything specific to RSS
> > /checksum offloads in hotplug callbacks but initializes VF port (through
> > ioctl) during hotplug add and removes VF port in hotplug remove callback.
> > So my understanding is, the dpdk app should continue to handle the
> checksum
> > offloads as part of hotplug callbacks and netvsc will not handle it
> > automatically.
> > Can you confirm if this is correct?
> > Regards,
> > Nandini
>
> The code should look at the checksum flags in each packet, rather
> than assuming VF hotplug will change things.
>
>

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