Re: questions about AF_PACKET V4 and AF_XDP

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