netdev - Re: [RFC net-next v2 2/2] tg3: Link queues to NAPIs

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Message-ID: <ZvbZ33RYhTQAfBOQ@LQ3V64L9R2>
Date: Fri, 27 Sep 2024 09:14:23 -0700
From: Joe Damato <jdamato@...tly.com>
To: Pavan Chebbi <pavan.chebbi@...adcom.com>
Cc: netdev@...r.kernel.org, Michael Chan <mchan@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC net-next v2 2/2] tg3: Link queues to NAPIs

On Fri, Sep 27, 2024 at 09:33:51AM +0530, Pavan Chebbi wrote:
> On Fri, Sep 27, 2024 at 4:47 AM Joe Damato <jdamato@...tly.com> wrote:
> >
> > On Wed, Sep 25, 2024 at 04:20:48PM +0000, Joe Damato wrote:
> > > Link queues to NAPIs using the netdev-genl API so this information is
> > > queryable.
> > >
> > > $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
> > >                          --dump queue-get --json='{"ifindex": 2}'
> > >
> > > [{'id': 0, 'ifindex': 2, 'type': 'rx'},
> > >  {'id': 1, 'ifindex': 2, 'napi-id': 146, 'type': 'rx'},
> > >  {'id': 2, 'ifindex': 2, 'napi-id': 147, 'type': 'rx'},
> > >  {'id': 3, 'ifindex': 2, 'napi-id': 148, 'type': 'rx'},
> > >  {'id': 0, 'ifindex': 2, 'napi-id': 145, 'type': 'tx'}]
> > >
> > > Signed-off-by: Joe Damato <jdamato@...tly.com>
> > > ---
> > >  drivers/net/ethernet/broadcom/tg3.c | 24 ++++++++++++++++++++----
> > >  1 file changed, 20 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
> > > index ddf0bb65c929..f78d7e8c40b2 100644
> > > --- a/drivers/net/ethernet/broadcom/tg3.c
> > > +++ b/drivers/net/ethernet/broadcom/tg3.c
> > > @@ -7395,18 +7395,34 @@ static int tg3_poll(struct napi_struct *napi, int budget)
> > >
> > >  static void tg3_napi_disable(struct tg3 *tp)
> > >  {
> > > +     struct tg3_napi *tnapi;
> > >       int i;
> > >
> > > -     for (i = tp->irq_cnt - 1; i >= 0; i--)
> > > -             napi_disable(&tp->napi[i].napi);
> > > +     ASSERT_RTNL();
> > > +     for (i = tp->irq_cnt - 1; i >= 0; i--) {
> > > +             tnapi = &tp->napi[i];
> > > +             if (tnapi->tx_buffers)
> > > +                     netif_queue_set_napi(tp->dev, i, NETDEV_QUEUE_TYPE_TX, NULL);
> >
> > It looks like the ASSERT_RTNL is unnecessary; netif_queue_set_napi
> > will call it internally, so I'll remove it before sending this to
> > the list (barring any other feedback).
> 
> Thanks LGTM. You can use Reviewed-by: Pavan Chebbi <pavan.chebbi@...adcom.com>

Thanks, I've added your Reviewed-by for the official submission.

I'll mention this in the cover letter when net-next is open but the
only changes I've made to the patch I posted are:
  - Removal of ASSERT_RTNL (mentioned above, as it seems to be unnecessary)
  - Wrapped lines at 80 characters (cosmetic change only)