netdev - Re: [PATCH net-next] net: airoha: Fix EGRESS_RATE_METER_EN

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Message-ID: <ZwET7MzCGVoDjIqt@lore-desk>
Date: Sat, 5 Oct 2024 12:24:44 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Jacob Keller <jacob.e.keller@...el.com>
Cc: Felix Fietkau <nbd@....name>, Sean Wang <sean.wang@...iatek.com>,
	Mark Lee <Mark-MC.Lee@...iatek.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: airoha: Fix EGRESS_RATE_METER_EN_MASK
 definition

> 
> 
> On 10/4/2024 2:51 PM, Lorenzo Bianconi wrote:
> > Fix typo in EGRESS_RATE_METER_EN_MASK mask definition. This bus was not
> > introducing any user visible problem.
> > 
> 
> I'm not sure I follow. This bit is used by airoha_qdma_init_qos which
> sets the REG_EGRESS_RATE_METER_CFG register?
> 
> How does this not provide any user visible issues? It seems like an
> incorrect enable bit likely means that QOS is not enabled? I'm guessing
> bit 29 is reserved?

Hi Jacob,

even if we are setting EGRESS_RATE_METER_EN_MASK bit (with a wrong value) in
REG_EGRESS_RATE_METER_CFG register, egress QoS metering will not be supported
yet since we are missing some other configuration (token bucket rate, token
bucket size. Airoha folks please correct me if I am wrong). This is why I do
not think it is important to backport this patch and I did not added any Fixes
tag.
QoS hw ingress/egress metering is in my ToDo list. Here I have ported the basic
qos configuration I found in the vendor sdk. I will add more info in the commit
log in v2. Sorry for the confusion.

Regards,
Lorenzo

> 
> It would be good to understand why this is not considered a fix?  The
> offending commit is in the net branch already.
> 
> > Introduced by commit 23020f049327 ("net: airoha: Introduce ethernet support
> > for EN7581 SoC")
> > 
> > Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> > ---
> >  drivers/net/ethernet/mediatek/airoha_eth.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/ethernet/mediatek/airoha_eth.c b/drivers/net/ethernet/mediatek/airoha_eth.c
> > index 2e01abc70c170f32f4206b34e116b441c14c628e..a1cfdc146a41610a3a6b060bfdc6e1d9aad97d5d 100644
> > --- a/drivers/net/ethernet/mediatek/airoha_eth.c
> > +++ b/drivers/net/ethernet/mediatek/airoha_eth.c
> > @@ -554,7 +554,7 @@
> >  #define FWD_DSCP_LOW_THR_MASK		GENMASK(17, 0)
> >  
> >  #define REG_EGRESS_RATE_METER_CFG		0x100c
> > -#define EGRESS_RATE_METER_EN_MASK		BIT(29)
> > +#define EGRESS_RATE_METER_EN_MASK		BIT(31)
> >  #define EGRESS_RATE_METER_EQ_RATE_EN_MASK	BIT(17)
> >  #define EGRESS_RATE_METER_WINDOW_SZ_MASK	GENMASK(16, 12)
> >  #define EGRESS_RATE_METER_TIMESLICE_MASK	GENMASK(10, 0)
> > 
> > ---
> > base-commit: c55ff46aeebed1704a9a6861777b799f15ce594d
> > change-id: 20241004-airoha-fixes-8aaa8177b234
> > 
> > Best regards,
> 

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