netdev - Re: [PATCH v4 net-next 4/6] net: dsa: sja1105: Advertise the 8 TX queues

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Date:   Sun, 15 Sep 2019 08:15:12 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>, vivien.didelot@...il.com,
        andrew@...n.ch, davem@...emloft.net, vinicius.gomes@...el.com,
        vedang.patel@...el.com, richardcochran@...il.com
Cc:     weifeng.voon@...el.com, jiri@...lanox.com, m-karicheri2@...com,
        jose.abreu@...opsys.com, ilias.apalodimas@...aro.org,
        jhs@...atatu.com, xiyou.wangcong@...il.com,
        kurt.kanzenbach@...utronix.de, joergen.andreasen@...rochip.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH v4 net-next 4/6] net: dsa: sja1105: Advertise the 8 TX
 queues



On 9/14/2019 7:00 PM, Vladimir Oltean wrote:
> This is a preparation patch for the tc-taprio offload (and potentially
> for other future offloads such as tc-mqprio).
> 
> Instead of looking directly at skb->priority during xmit, let's get the
> netdev queue and the queue-to-traffic-class mapping, and put the
> resulting traffic class into the dsa_8021q PCP field. The switch is
> configured with a 1-to-1 PCP-to-ingress-queue-to-egress-queue mapping
> (see vlan_pmap in sja1105_main.c), so the effect is that we can inject
> into a front-panel's egress traffic class through VLAN tagging from
> Linux, completely transparently.
> 
> Unfortunately the switch doesn't look at the VLAN PCP in the case of
> management traffic to/from the CPU (link-local frames at
> 01-80-C2-xx-xx-xx or 01-1B-19-xx-xx-xx) so we can't alter the
> transmission queue of this type of traffic on a frame-by-frame basis. It
> is only selected through the "hostprio" setting which ATM is harcoded in
> the driver to 7.
> 
> Signed-off-by: Vladimir Oltean <olteanv@...il.com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian