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Message-ID: <20221108075816.wsn2olii2lzcq7tf@skbuf>
Date: Tue, 8 Nov 2022 09:58:16 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Felix Fietkau <nbd@....name>
Cc: netdev@...r.kernel.org, Sean Wang <sean.wang@...iatek.com>,
Landen Chao <Landen.Chao@...iatek.com>,
DENG Qingfang <dqfext@...il.com>, Andrew Lunn <andrew@...n.ch>,
Vivien Didelot <vivien.didelot@...il.com>,
Florian Fainelli <f.fainelli@...il.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>,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/14] net: dsa: tag_mtk: assign per-port queues
On Tue, Nov 08, 2022 at 07:01:29AM +0100, Felix Fietkau wrote:
> On 07.11.22 22:22, Vladimir Oltean wrote:
> > On Mon, Nov 07, 2022 at 07:54:43PM +0100, Felix Fietkau wrote:
> > > Keeps traffic sent to the switch within link speed limits
> > >
> > > Signed-off-by: Felix Fietkau <nbd@....name>
> > > ---
> > > net/dsa/tag_mtk.c | 3 +++
> > > 1 file changed, 3 insertions(+)
> > >
> > > diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
> > > index 415d8ece242a..445d6113227f 100644
> > > --- a/net/dsa/tag_mtk.c
> > > +++ b/net/dsa/tag_mtk.c
> > > @@ -25,6 +25,9 @@ static struct sk_buff *mtk_tag_xmit(struct sk_buff *skb,
> > > u8 xmit_tpid;
> > > u8 *mtk_tag;
> > > + /* Reserve the first three queues for packets not passed through DSA */
> > > + skb_set_queue_mapping(skb, 3 + dp->index);
> > > +
> >
> > Should DSA have to care about this detail, or could you rework your
> > mtk_select_queue() procedure to adjust the queue mapping as needed?
> I'm setting the queue here so that I don't have to add the extra overhead of
> parsing the payload in the ethernet driver.
> For passing the queue, I used a similar approach as tag_brcm.c and
> drivers/net/ethernet/broadcom/bcmsysport.c
I was just asking if you can't add the 3 elsewhere, since the DSA
tagging protocol shouldn't care how many MAC IDs the DSA master has.
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