# Re: \[PATCH net-next v4 2/3\] virtio\_net: add optional flow dissection in virtio\_net\_hdr\_to\_skb

- From: Alexei Starovoitov \<hidden\>
- Date: 2021-06-10 04:20:38 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/06/11205109
- Thread: https://ratatoskr.run/netdev/2021/06/11204926/t.md

```text
On Wed, Jun 9, 2021 at 9:13 PM Jason Wang [ref] 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.
```