netdev - 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 03:34:16 +0000
From:   <Arun.Ramadoss@...rochip.com>
To:     <olteanv@...il.com>, <andrew@...n.ch>, <f.fainelli@...il.com>,
        <kuba@...nel.org>, <edumazet@...gle.com>, <pabeni@...hat.com>,
        <o.rempel@...gutronix.de>, <Woojung.Huh@...rochip.com>,
        <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <UNGLinuxDriver@...rochip.com>, <kernel@...gutronix.de>
Subject: Re: [PATCH net-next v3 2/2] net: dsa: microchip: add ETS Qdisc
 support for KSZ9477 series

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.