Re: [PATCH bpf 4/4] xsk: fix potential race in SKB TX completion code

[Eric Dumazet]

On 06/27/2018 07:02 AM, Magnus Karlsson wrote:
> There was a potential race in the TX completion code for
> the SKB case when the TX napi thread and the error path
> of the sendmsg code could both call the SKB destructor
> at the same time. Fixed by introducing a spin_lock in the
> destructor.


Wow, what is the impact on performance ?

Please describe a bit more what is the problem.