# Re: \[net-next 09/14\] igb: Report L4 Rx hash via skb-\>l4\_rxhash

- From: Eric Dumazet \<hidden\>
- Date: 2013-01-17 17:14:53 
- List: netdev
- Page: https://ratatoskr.run/netdev/2013/01/10912920
- Thread: https://ratatoskr.run/netdev/2013/01/10912867/t.md

```text
On Thu, 2013-01-17 at 09:07 -0800, Alexander Duyck wrote:

> Isn't the same true of TCP?  I believe STT is intended to run over the
> TCP protocol, or am I getting ahead of myself since STT is not supported
> by the kernel?
> 

probably ;)

> > Also, is IGB really using the ports in the rss for UDP packets ?
> 
> Not by default.  The default is to only hash on the IP header for UDP
> packets.
> 
> As such the default would only be setting the l4_rxhash on TCP frames
> only.  The user would have to specifically request L4 port hashing for
> UDP via the "ethtool -N" command for configuring rx-flow-hash.

So you should rewrite this patch ?

Or have I missed something ?
```