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Message-ID: <20190702171029.76c60538@carbon>
Date: Tue, 2 Jul 2019 17:10:29 +0200
From: Jesper Dangaard Brouer <brouer@...hat.com>
To: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Cc: netdev@...r.kernel.org,
Ilias Apalodimas <ilias.apalodimas@...aro.org>,
grygorii.strashko@...com, jakub.kicinski@...ronome.com,
daniel@...earbox.net, john.fastabend@...il.com, ast@...nel.org,
linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
brouer@...hat.com
Subject: Re: [PATCH] net: core: page_pool: add user refcnt and reintroduce
page_pool_destroy
On Tue, 2 Jul 2019 17:56:13 +0300
Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org> wrote:
> On Tue, Jul 02, 2019 at 04:52:30PM +0200, Jesper Dangaard Brouer wrote:
> >On Tue, 2 Jul 2019 17:44:27 +0300
> >Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org> wrote:
> >
> >> On Tue, Jul 02, 2019 at 04:31:39PM +0200, Jesper Dangaard Brouer wrote:
> >> >From: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
> >> >
> >> >Jesper recently removed page_pool_destroy() (from driver invocation) and
> >> >moved shutdown and free of page_pool into xdp_rxq_info_unreg(), in-order to
> >> >handle in-flight packets/pages. This created an asymmetry in drivers
> >> >create/destroy pairs.
> >> >
> >> >This patch add page_pool user refcnt and reintroduce page_pool_destroy.
> >> >This serves two purposes, (1) simplify drivers error handling as driver now
> >> >drivers always calls page_pool_destroy() and don't need to track if
> >> >xdp_rxq_info_reg_mem_model() was unsuccessful. (2) allow special cases
> >> >where a single RX-queue (with a single page_pool) provides packets for two
> >> >net_device'es, and thus needs to register the same page_pool twice with two
> >> >xdp_rxq_info structures.
> >>
> >> As I tend to use xdp level patch there is no more reason to mention (2) case
> >> here. XDP patch serves it better and can prevent not only obj deletion but also
> >> pool flush, so, this one patch I could better leave only for (1) case.
> >
> >I don't understand what you are saying.
> >
> >Do you approve this patch, or do you reject this patch?
> >
> It's not reject, it's proposition to use both, XDP and page pool patches,
> each having its goal.
Just to be clear, if you want this patch to get accepted you have to
reply with your Signed-off-by (as I wrote).
Maybe we should discuss it in another thread, about why you want two
solutions to the same problem.
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
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