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

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Date:   Mon, 21 Jun 2021 09:18:39 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Tanner Love <tannerlove.kernel@...il.com>,
        Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Petar Penkov <ppenkov@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Tanner Love <tannerlove@...gle.com>
Subject: Re: [PATCH net-next v4 2/3] virtio_net: add optional flow dissection
 in virtio_net_hdr_to_skb

> >> 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.