netdev - RE: [RFC net-next 2/2] net: fec: add ndo_select_queue to fix TX bandwidth fluctuations

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Message-ID: <DB8PR04MB67957D65A10E6E70C68E8D88E6259@DB8PR04MB6795.eurprd04.prod.outlook.com>
Date:   Tue, 25 May 2021 09:44:57 +0000
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "frieder.schrempf@...tron.de" <frieder.schrempf@...tron.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [RFC net-next 2/2] net: fec: add ndo_select_queue to fix TX
 bandwidth fluctuations


Hi Andrew,

> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: 2021年5月23日 22:39
> To: Joakim Zhang <qiangqing.zhang@....com>
> Cc: davem@...emloft.net; kuba@...nel.org; frieder.schrempf@...tron.de;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org; dl-linux-imx
> <linux-imx@....com>
> Subject: Re: [RFC net-next 2/2] net: fec: add ndo_select_queue to fix TX
> bandwidth fluctuations
> 
> > @@ -76,6 +76,8 @@ static void fec_enet_itr_coal_init(struct net_device
> *ndev);
> >
> >  #define DRIVER_NAME	"fec"
> >
> > +static const u16 fec_enet_vlan_pri_to_queue[8] = {1, 1, 1, 1, 2, 2, 2, 2};
> 
> I wonder if priority 0 should be sent to queue 0?

Yes, we can. But the original thought of author seems to, VLAN tagged packets only use queue 1&2, and queue 0is reserved for VLAN untagged packets.

Best Regards,
Joakim Zhang
>   Andrew