Re: questions about AF_PACKET V4 and AF_XDP

Re: questions about AF_PACKET V4 and AF_XDP

[Björn Töpel]

On 2019-06-05 19:56, Junsong Zhao (junszhao) wrote:
> Hi Magnus and Bjorn,
> 
> I saw your articles and presentation about AF_PACKET V4. It is exciting 
> to know that the kernel socket can have 40G throughput.
> 
> But it seems the code is not in the 4.19 or 5.1 kernel. Instead there is 
> a new feature AF_XDP in 4.19 kernel and it is kind of similar to 
> AF_PACKET V4.
> 
> Can you clarify if AF_XDP is the successor of AF_PACKET V4? Apart from 
> i40e driver, is there any other driver that supports the feature?
>

AF_PACKET v4 never made it to mainland, instead AF_XDP took that place.

Drivers with zero-copy support are i40e, ixgbe, and soon mlx5 and ice.

There's an LWN article on AF_XDP here: https://lwn.net/Articles/750845/


Thanks,
Björn


> Here is the link to the article:
> 
> https://lwn.net/Articles/737947/
> 
> Regards,
> 
> Junsong Zhao
> 
> Tech Lead
> 
> Stealthwatch
> 
> junszhao@cisco.com
> 
> Mobile: +1-410-530-1036
>