netdev - Re: lantiq_xrx200: Ethernet MAC with multiple TX queues

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Message-ID: <CAFBinCCrEusRHwQMdKYx2yP-JgC4qkENpG_BCRQ5JHWD9=TEXw@mail.gmail.com>
Date:   Thu, 25 Mar 2021 20:29:32 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>
Cc:     netdev@...r.kernel.org, andrew@...n.ch, vivien.didelot@...il.com,
        davem@...emloft.net, kuba@...nel.org
Subject: Re: lantiq_xrx200: Ethernet MAC with multiple TX queues

Hello Florian, Vladimir, Hauke,

first of all: thank you very much for this very informative discussion!

On Thu, Mar 25, 2021 at 4:08 AM Florian Fainelli <f.fainelli@...il.com> wrote:
[...]
> > Just to clarify, this port to queue mapping is completely optional, right?
> > You can send packets to a certain switch port through any TX queue of
> > the systemport?
>
> Absolutely, the Broadcom tags allow you to steer traffic towards any TX
> queue of any switch port. If ring inspection is disabled then there is
> no flow control applied whatsoever.
I think with the Lantiq PMAC and GSWIP the situation is very similar

skb_set_queue_mapping from tag_brcm.c seems very interesting.
a per-CPU queue is also very interesting since these Lantiq SoCs have
two MIPS cores


Many thanks to all of you again!

Best regards,
Martin