netdev - Re: [PATCH v3 net-next] net: dsa: sja1105: offload the Credit-Based Shaper qdisc

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Date:   Thu, 28 May 2020 11:01:43 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     olteanv@...il.com
Cc:     andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        netdev@...r.kernel.org, vinicius.gomes@...el.com
Subject: Re: [PATCH v3 net-next] net: dsa: sja1105: offload the
 Credit-Based Shaper qdisc

From: Vladimir Oltean <olteanv@...il.com>
Date: Thu, 28 May 2020 03:27:58 +0300

> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> SJA1105, being AVB/TSN switches, provide hardware assist for the
> Credit-Based Shaper as described in the IEEE 8021Q-2018 document.
> 
> First generation has 10 shapers, freely assignable to any of the 4
> external ports and 8 traffic classes, and second generation has 16
> shapers.
> 
> The Credit-Based Shaper tables are accessed through the dynamic
> reconfiguration interface, so we have to restore them manually after a
> switch reset. The tables are backed up by the static config only on
> P/Q/R/S, and we don't want to add custom code only for that family,
> since the procedure that is in place now works for both.
> 
> Tested with the following commands:
> 
> data_rate_kbps=67000
> port_transmit_rate_kbps=1000000
> idleslope=$data_rate_kbps
> sendslope=$(($idleslope - $port_transmit_rate_kbps))
> locredit=$((-0x80000000))
> hicredit=$((0x7fffffff))
> tc qdisc add dev swp2 root handle 1: mqprio hw 0 num_tc 8 \
>         map 0 1 2 3 4 5 6 7 \
>         queues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7
> tc qdisc replace dev swp2 parent 1:1 cbs \
>         idleslope $idleslope \
>         sendslope $sendslope \
>         hicredit $hicredit \
>         locredit $locredit \
>         offload 1
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Applied, thank you.