netdev - Re: [PATCH 05/14] net: dsa: tag_mtk: assign per-port queues

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Date:   Mon, 7 Nov 2022 23:22:09 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Felix Fietkau <nbd@....name>
Cc:     netdev@...r.kernel.org, Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/14] net: dsa: tag_mtk: assign per-port queues

On Mon, Nov 07, 2022 at 07:54:43PM +0100, Felix Fietkau wrote:
> Keeps traffic sent to the switch within link speed limits
> 
> Signed-off-by: Felix Fietkau <nbd@....name>
> ---
>  net/dsa/tag_mtk.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
> index 415d8ece242a..445d6113227f 100644
> --- a/net/dsa/tag_mtk.c
> +++ b/net/dsa/tag_mtk.c
> @@ -25,6 +25,9 @@ static struct sk_buff *mtk_tag_xmit(struct sk_buff *skb,
>  	u8 xmit_tpid;
>  	u8 *mtk_tag;
>  
> +	/* Reserve the first three queues for packets not passed through DSA */
> +	skb_set_queue_mapping(skb, 3 + dp->index);
> +

Should DSA have to care about this detail, or could you rework your
mtk_select_queue() procedure to adjust the queue mapping as needed?

>  	/* Build the special tag after the MAC Source Address. If VLAN header
>  	 * is present, it's required that VLAN header and special tag is
>  	 * being combined. Only in this way we can allow the switch can parse
> -- 
> 2.38.1
>