linux-kernel - RE: [PATCH net-next 3/3] net: stmmac: Introducing support for Page Pool

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Date:   Thu, 4 Jul 2019 14:45:59 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Jose Abreu <Jose.Abreu@...opsys.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>
Subject: RE: [PATCH net-next 3/3] net: stmmac: Introducing support for Page
 Pool

From: Jesper Dangaard Brouer <brouer@...hat.com>

> The page_pool_request_shutdown() API return indication if there are any
> in-flight frames/pages, to know when it is safe to call
> page_pool_free(), which you are also missing a call to.
> 
> This page_pool_request_shutdown() is only intended to be called from
> xdp_rxq_info_unreg() code, that handles and schedule a work queue if it
> need to wait for in-flight frames/pages.

So you mean I can't call it or I should implement the same deferred work 
?

Notice that in stmmac case there will be no in-flight frames/pages 
because we free them all before calling this ...