linux-kernel - Re: [net-next v3 2/2] tg3: Link queues to NAPIs

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Message-ID: <ZwPu7DmYwwK_uDmD@LQ3V64L9R2>
Date: Mon, 7 Oct 2024 10:23:40 -0400
From: Joe Damato <jdamato@...tly.com>
To: Michael Chan <michael.chan@...adcom.com>
Cc: netdev@...r.kernel.org, Pavan Chebbi <pavan.chebbi@...adcom.com>,
	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: [net-next v3 2/2] tg3: Link queues to NAPIs

On Mon, Oct 07, 2024 at 12:30:09AM -0700, Michael Chan wrote:
> On Sat, Oct 5, 2024 at 7:57 AM Joe Damato <jdamato@...tly.com> wrote:
> > +               if (tnapi->tx_buffers) {
> > +                       netif_queue_set_napi(tp->dev, txq_idx,
> > +                                            NETDEV_QUEUE_TYPE_TX,
> > +                                            &tnapi->napi);
> > +                       txq_idx++;
> > +               } else if (tnapi->rx_rcb) {
> 
> Shouldn't this be "if" instead of "else if" ?  A napi can be for both
> a TX ring and an RX ring in some cases.
> Thanks.

BTW: tg3 set_channels doesn't seem to support combined queues;
combined_count is not even examined in set_channels. But maybe
the link queue can be a combined queue, I don't know.

Regardless, I'll still make the change you requested as there is
similar code in tg3_request_irq.

But what I really would like to get feedback on is the rxq and txq
indexing with the running counters, please. That was called out
explicitly in the cover letter.

Thanks.