Re: [PATCH net-next v4 2/3] virtio_net: add optional flow dissection in virtio_net_hdr_to_skb

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2) use some general fields instead of virtio-net specific fields, e.g
using device header instead of vnet header in the flow keys strcuture

Can you give an example of what would be in the device header?

Specific for GSO, we have two sets of constants: VIRTIO_NET_HDR_GSO_..
and SKB_GSO_.. Is the suggestion to replace the current use of the
first in field flow_keys->virtio_net_hdr.gso_type with the second in
flow_keys->gso_type?

No, I meant using a general fields like flow_keys->device_hdr. And use
bpf helpers to access the field.

What would be in this device_hdr field, and what would the bpf helpers
access? I don't fully follow what this is if not vnet_hdr.