Expectations of an RX mbuf when using virtio PMD

[Stephen Hemminger]

On Sat, 7 Dec 2024 21:10:39 -0800
Patrick Mahan <mahan at mahan.org> wrote:

> On 12/7/24 3:58 PM, Oleksandr Nahnybida wrote:
> > Hello Patrick,
> > 
> > You can use rte_net_get_ptype function directly if packet_type is RTE_PTYPE_UNKNOWN.
> > Whether the packet_type value is set is PMD/NIC dependent.
> > i40e does this at the hardware level, virtio does this in software with 
> > rte_net_get_ptype and only in the specific case.
> >   
> 
> Thanks for the suggestion, I guess I was spoiled by the PMD setting it for me 
> that I expected it was a basic function of the PMD.

Most code doesn't use ptype, and reading the packet data to determine the
type would slow down tests like basic forwarding