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

[Florian Fainelli <f.fainelli@gmail.com>]

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@gmail.com>

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