netdev - Re: [PATCH net-next v8 2/3] net: implement threaded-able napi poll loop support

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Date:   Wed, 27 Jan 2021 17:36:45 -0800
From:   Wei Wang <weiwan@...gle.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Felix Fietkau <nbd@....name>,
        Alexander Duyck <alexander.duyck@...il.com>
Subject: Re: [PATCH net-next v8 2/3] net: implement threaded-able napi poll
 loop support

On Wed, Jan 27, 2021 at 4:12 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Mon, 25 Jan 2021 17:11:08 -0800 Wei Wang wrote:
> > This patch allows running each napi poll loop inside its own
> > kernel thread.
> > The kthread is created during netif_napi_add() if dev->threaded
> > is set. And threaded mode is enabled in napi_enable(). We will
> > provide a way to set dev->threaded and enable threaded mode
> > without a device up/down in the following patch.
> >
> > Once that threaded mode is enabled and the kthread is
> > started, napi_schedule() will wake-up such thread instead
> > of scheduling the softirq.
> >
> > The threaded poll loop behaves quite likely the net_rx_action,
> > but it does not have to manipulate local irqs and uses
> > an explicit scheduling point based on netdev_budget.
> >
> > Co-developed-by: Paolo Abeni <pabeni@...hat.com>
> > Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> > Co-developed-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> > Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> > Co-developed-by: Jakub Kicinski <kuba@...nel.org>
> > Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> > Signed-off-by: Wei Wang <weiwan@...gle.com>
>
> include/linux/netdevice.h:2150: warning: Function parameter or member 'threaded' not described in 'net_device'
>
>
> scripts/kernel-doc -none $files
>
> is your friend - W=1 does not check headers.

Thanks! Will add description for this new field.