netdev - Re: [net-next-2.6 PATCH] net: netif_set_real_num_rx_queues may cap num_rx

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Message-ID: <20101006181458.GA6817@mcarlson.broadcom.com>
Date:	Wed, 6 Oct 2010 11:14:58 -0700
From:	"Matt Carlson" <mcarlson@...adcom.com>
To:	"Ben Hutchings" <bhutchings@...arflare.com>
cc:	"Eric Dumazet" <eric.dumazet@...il.com>,
	"Matthew Carlson" <mcarlson@...adcom.com>,
	"John Fastabend" <john.r.fastabend@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"therbert@...gle.com" <therbert@...gle.com>
Subject: Re: [net-next-2.6 PATCH] net: netif_set_real_num_rx_queues may
 cap num_rx_queues at init time

On Wed, Oct 06, 2010 at 08:31:45AM -0700, Ben Hutchings wrote:
> On Wed, 2010-10-06 at 17:23 +0200, Eric Dumazet wrote:
> > Le mercredi 06 octobre 2010 ?? 16:07 +0100, Ben Hutchings a ??crit :
> > 
> > > The waste of memory is minimal now that we only allocate kobjects for
> > > real_num_rx_queues.
> > 
> > Thats strange, here with tg3 (and mono queue device) :
> > 
> > 0a:04.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5715S
> > Gigabit Ethernet (rev a3)
> > 
> > grep . /sys/class/net/eth2/queues/rx-*/rps_cpus
> > /sys/class/net/eth2/queues/rx-0/rps_cpus:00000000
> > /sys/class/net/eth2/queues/rx-1/rps_cpus:00000000
> > /sys/class/net/eth2/queues/rx-2/rps_cpus:00000000
> > /sys/class/net/eth2/queues/rx-3/rps_cpus:00000000
> > /sys/class/net/eth2/queues/rx-4/rps_cpus:00000000
> 
> It looks like I missed a necessary call to
> netif_set_real_num_rx_queues() in tg3.  I suggest that Matt should check
> and correct this since I got the numbers wrong last time.

Yes.  We were missing a call to this function in the legacy case.


[PATCH net-next] tg3: Set real_num_rx_queues for non-multiq devs

Commit 2ddaad397c47de012dfb956b0c05540da1a0dde5 entitled "tg3: Use
netif_set_real_num_{rx,tx}_queues()" added a new call to
netif_set_real_num_rx_queues in tg3_enable_msix().  This call also needs
to be added to the legacy path to correctly reflect the actual number of
rx queues.

Signed-off-by: Matt Carlson <mcarlson@...adcom.com>
---
 drivers/net/tg3.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 16e1a95..e5b9ec5 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -8906,6 +8906,7 @@ defcfg:
 		tp->irq_cnt = 1;
 		tp->napi[0].irq_vec = tp->pdev->irq;
 		netif_set_real_num_tx_queues(tp->dev, 1);
+		netif_set_real_num_rx_queues(tp->dev, 1);
 	}
 }
 
-- 
1.7.2.2


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