linux-kernel - Re: [PATCH net-next] tg3: extract GRXRINGS from .get

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Message-ID: <aQ3SNvSigJwffoQK@horms.kernel.org>
Date: Fri, 7 Nov 2025 11:04:22 +0000
From: Simon Horman <horms@...nel.org>
To: Michael Chan <michael.chan@...adcom.com>
Cc: Breno Leitao <leitao@...ian.org>,
	Pavan Chebbi <pavan.chebbi@...adcom.com>,
	Michael Chan <mchan@...adcom.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-team@...a.com
Subject: Re: [PATCH net-next] tg3: extract GRXRINGS from .get_rxnfc

On Thu, Nov 06, 2025 at 10:45:21AM -0800, Michael Chan wrote:
> On Thu, Nov 6, 2025 at 9:06 AM Breno Leitao <leitao@...ian.org> wrote:
> >     tg3: Fix num of RX queues being reported by ethtool
> >
> >     Using num_online_cpus() to report number of queues is actually not
> >     correct, as reported by Michael[1].
> >
> >     netif_get_num_default_rss_queues() was used to replace num_online_cpus()
> >     in the past, but tg3 ethtool callbacks didn't get converted. Doing it
> >     now.
> >
> >     Link: https://lore.kernel.org/all/CACKFLim7ruspmqvjr6bNRq5Z_XXVk3vVaLZOons7kMCzsEG23A@mail.gmail.com/#t [1]
> >
> >     Signed-off-by: Breno Leitao <leitao@...ian.org>
> >     Suggested-by: Michael Chan <michael.chan@...adcom.com>
> >
> > diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
> > index fa58c3ffceb06..5fdaee7ef9d7a 100644
> > --- a/drivers/net/ethernet/broadcom/tg3.c
> > +++ b/drivers/net/ethernet/broadcom/tg3.c
> > @@ -12729,7 +12729,7 @@ static u32 tg3_get_rx_ring_count(struct net_device *dev)
> >         if (netif_running(tp->dev))
> >                 return tp->rxq_cnt;
> >
> > -       return min(num_online_cpus(), TG3_RSS_MAX_NUM_QS);
> > +       return min((u32) netif_get_num_default_rss_queues(), tp->rxq_max);
> 
> Isn't it better to use min_t()?

FWIIW, umin() seems appropriate to me.

Commit 80fcac55385c ("minmax: add umin(a, b) and umax(a, b)")
includes quite a long explanation of why it exists.
And that does seem to match this case.