linux-kernel - Re: [PATCH net-next v3 2/2] net: ethernet: ti: am65-cpsw: enable DSCP to priority map for RX

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Message-ID: <ZzXpaC7X2UBt77+2@debian>
Date: Thu, 14 Nov 2024 13:13:28 +0100
From: Guillaume Nault <gnault@...hat.com>
To: Roger Quadros <rogerq@...nel.org>
Cc: Siddharth Vadapalli <s-vadapalli@...com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>, linux-omap@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, srk@...com,
	Pekka Varis <p-varis@...com>
Subject: Re: [PATCH net-next v3 2/2] net: ethernet: ti: am65-cpsw: enable
 DSCP to priority map for RX

On Thu, Nov 14, 2024 at 11:41:06AM +0200, Roger Quadros wrote:
> On 14/11/2024 02:16, Guillaume Nault wrote:
> > So what about following the IETF mapping found in section 4.3?
> > https://datatracker.ietf.org/doc/html/rfc8325#section-4.3
> 
> Thanks for this tip.
> I will update this patch to have the default DSCP to UP mapping as per
> above link and map all unused DSCP to UP 0.
> 
> Is there any mechanism/API for network administrator to change this
> default mapping in the network drivers?

I'm not aware of any (appart from manual update with tc), but I could
have missed something. It'd probably make sense to have such a
mechanism though.

> >>  static void am65_cpsw_sl_ctl_reset(struct am65_cpsw_port *port)
> >>  {
> >>  	cpsw_sl_reset(port->slave.mac_sl, 100);
> >> @@ -921,6 +974,7 @@ static int am65_cpsw_nuss_ndo_slave_open(struct net_device *ndev)
> >>  	common->usage_count++;
> >>  
> >>  	am65_cpsw_port_set_sl_mac(port, ndev->dev_addr);
> >> +	am65_cpsw_port_enable_dscp_map(port);
> >>  
> >>  	if (common->is_emac_mode)
> >>  		am65_cpsw_init_port_emac_ale(port);
> >>
> >> -- 
> >> 2.34.1
> >>
> >>
> > 
> 
> -- 
> cheers,
> -roger
>