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

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Date:   Mon, 13 Mar 2023 06:46:50 +0000
From:   <Arun.Ramadoss@...rochip.com>
To:     <o.rempel@...gutronix.de>
CC:     <olteanv@...il.com>, <andrew@...n.ch>,
        <linux-kernel@...r.kernel.org>, <UNGLinuxDriver@...rochip.com>,
        <f.fainelli@...il.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <edumazet@...gle.com>, <netdev@...r.kernel.org>,
        <Woojung.Huh@...rochip.com>, <davem@...emloft.net>,
        <kernel@...gutronix.de>
Subject: Re: [PATCH net-next v3 2/2] net: dsa: microchip: add ETS Qdisc
 support for KSZ9477 series

On Mon, 2023-03-13 at 06:36 +0100, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> 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.

Ok. 

Acked-by: Arun Ramadoss <arun.ramadoss@...rochip.com>

> 
> Regatds,
> Oleksij
> --
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