linux-kernel - Re: [PATCH net-next v3 2/2] net: dsa: microchip: add ETS Qdisc support for KSZ9477 series

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Message-ID: <20230313053607.GD29822@pengutronix.de>
Date:   Mon, 13 Mar 2023 06:36:07 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Arun.Ramadoss@...rochip.com
Cc:     olteanv@...il.com, andrew@...n.ch, f.fainelli@...il.com,
        kuba@...nel.org, edumazet@...gle.com, pabeni@...hat.com,
        Woojung.Huh@...rochip.com, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next v3 2/2] net: dsa: microchip: add ETS Qdisc
 support for KSZ9477 series

On Mon, Mar 13, 2023 at 03:34:16AM +0000, Arun.Ramadoss@...rochip.com wrote:
> Hi Oleksij,
> On Fri, 2023-03-10 at 10:08 +0100, Oleksij Rempel wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you
> > know the content is safe
> > 
> > Add ETS Qdisc support for KSZ9477 of switches. Current implementation
> > is
> > limited to strict priority mode.
> > 
> > Tested on KSZ8563R with following configuration:
> > tc qdisc replace dev lan2 root handle 1: ets strict 4 \
> >   priomap 3 3 2 2 1 1 0 0
> > ip link add link lan2 name v1 type vlan id 1 \
> >   egress-qos-map 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
> > 
> > and patched iperf3 version:
> > https://github.com/esnet/iperf/pull/1476
> > iperf3 -c 172.17.0.1 -b100M  -l1472 -t100 -u -R --sock-prio 2
> > 
> > Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> > ---
> >  drivers/net/dsa/microchip/ksz_common.c | 218
> > +++++++++++++++++++++++++
> >  drivers/net/dsa/microchip/ksz_common.h |  12 ++
> >  2 files changed, 230 insertions(+)
> > 
> > diff --git a/drivers/net/dsa/microchip/ksz_common.c
> > b/drivers/net/dsa/microchip/ksz_common.c
> > index ae05fe0b0a81..54d75ec22ef0 100644
> > --- a/drivers/net/dsa/microchip/ksz_common.c
> > +++ b/drivers/net/dsa/microchip/ksz_common.c
> > @@ -1087,6 +1087,7 @@ const struct ksz_chip_data ksz_switch_chips[] =
> > {
> >                 .port_nirqs = 3,
> >                 .num_tx_queues = 4,
> >                 .tc_cbs_supported = true,
> > +               .tc_ets_supported = true,
> 
> Whether the switch which are supporting cbs will also support ets or
> not. If CBS and ETS are related, then is it possible to use single flag
> controlling both the feature. I could infer that switch which has
> tc_cbs_supported  true, also has tc_ets_supported also true.
> 
> If both are different, patch looks good to me.

Both are different. For example on ksz8 switches it is possible to
implement tc-etc but not tc-cbs.

Regatds,
Oleksij
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