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

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Message-ID: <CAADnVQL_+oKjH341ccC_--ing6dviAPwWRocgYrTKidkKo-NcA@mail.gmail.com>
Date:   Wed, 9 Jun 2021 21:19:11 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Willem de Bruijn <willemdebruijn.kernel@...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

On Wed, Jun 9, 2021 at 9:13 PM Jason Wang <jasowang@...hat.com> wrote:
>
> So I wonder why not simply use helpers to access the vnet header like
> how tcp-bpf access the tcp header?

Short answer - speed.
tcp-bpf accesses all uapi and non-uapi structs directly.