From: Eric Dumazet
Date: Mon, 14 Oct 2019 11:22:30 -0700
> tc_ctl_action() has the ability to loop forever if tcf_action_add()
> returns -EAGAIN.
>
> This special case has been done in case a module needed to be loaded,
> but it turns out that tcf_add_notify() could also return -EAGAIN
> if the
tc_ctl_action() has the ability to loop forever if tcf_action_add()
returns -EAGAIN.
This special case has been done in case a module needed to be loaded,
but it turns out that tcf_add_notify() could also return -EAGAIN
if the socket sk_rcvbuf limit is hit.
We need to separate the two cases, and
