linux-kernel - Re: [PATCH net-next] net: stmmac: qcom-ethqos: Add sysfs nodes for qcom ethqos

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Date:   Wed, 13 Dec 2023 10:54:02 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Sneh Shah <quic_snehshah@...cinc.com>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...cinc.com, Andrew Halaney <ahalaney@...hat.com>,
        andersson@...nel.org
Subject: Re: [PATCH net-next] net: stmmac: qcom-ethqos: Add sysfs nodes for
 qcom ethqos

> >> We need to route vlan traffic of a specific Priority to GVM Queue
> >> (Ethernet queue 5) via programming a MAC register. The MAC register
> >> is not accessible in GVM and has to be programmed from PVM. stmmac
> >> already has TC OPS to program this routing via vlan
> >> priority. However, as PVM has only 4 queues enabled, TC tool will
> >> not take 5th queue as input. Hence, these nodes were added to
> >> conifure the MAC register to route specific vlan packets to 5th
> >> queue in GVM.
> >  
> >> Note: The queues mentioned above are HW MTL Queues and DMA
> >> Channels. The routing can be done in the HW itself based on vlan pcp
> >> before the packets reach to driver.
> > 
> > Is the normal way you would do this is like this:
> > 
> > tc qdisc add dev eth1 parent root handle 100 \
> > mqprio num_tc 4 \
> > map 0 1 2 3 0 0 0 0 0 0 0 0 0 0 0 0 \
> > queues 1@0 1@1 1@2 1@3 \
> > hw 1
> > 
> > But you are saying that you cannot extend this to 5 queues?
> > 
> >     Andrew
> 

> Yes this can't extend to 5 queues. Because, stmmac in primary
> virtual machine will only have 4 netdev queues. So TC won't take
> input for 5th queue.

I still don't understand your architecture. How can you have 5 queues
if the physical hardware only has 4?

Is there any documentation for all this? Any datasheet?

   Andrew