From: Jesper Dangaard Brouer <bro...@redhat.com> Date: Tue, 18 Jun 2019 15:05:07 +0200
> This patchset fix page_pool API and users, such that drivers can use it for > DMA-mapping. A number of places exist, where the DMA-mapping would not get > released/unmapped, all these are fixed. This occurs e.g. when an xdp_frame > gets converted to an SKB. As network stack doesn't have any callback for XDP > memory models. > > The patchset also address a shutdown race-condition. Today removing a XDP > memory model, based on page_pool, is only delayed one RCU grace period. This > isn't enough as redirected xdp_frames can still be in-flight on different > queues (remote driver TX, cpumap or veth). > > We stress that when drivers use page_pool for DMA-mapping, then they MUST > use one packet per page. This might change in the future, but more work lies > ahead, before we can lift this restriction. > > This patchset change the page_pool API to be more strict, as in-flight page > accounting is added. Series applied, thanks Jesper.
