On Wed, Dec 20, 2017 at 12:09 PM, John Fastabend
<john.fastab...@gmail.com> wrote:
> RCU grace period is needed for lockless qdiscs added in the commit
> c5ad119fb6c09 ("net: sched: pfifo_fast use skb_array").
>
> It is needed now that qdiscs may be lockless otherwise we risk
> free'ing a qdisc that is still in use from datapath. Additionally,
> push list cleanup into RCU callback. Otherwise we risk the datapath
> adding skbs during removal.What about qdisc_graft() -> dev_deactivate() -> synchronize_net() ? It doesn't work with your "lockless" patches?
