linux-kernel - Re: [PATCH net-next 2/9] net: dsa: mv88e6xxx: use 4-bit port for PVT data

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Date:   Thu, 30 Mar 2017 15:34:23 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH net-next 2/9] net: dsa: mv88e6xxx: use 4-bit port for PVT
 data

On Wed, Mar 29, 2017 at 04:30:13PM -0400, Vivien Didelot wrote:
> The Cross-chip Port Based VLAN Table (PVT) supports two indexing modes,
> one using 5-bit for device and 4-bit for port, the other using 4-bit for
> device and 5-bit for port, configured via the Global 2 Misc register.
> 
> Only 4 bits for the source port are needed when interconnecting 88E6xxx
> switch devices since they all support less than 16 physical ports. The
> full 5 bits are needed when interconnecting a device with 98DXxxx switch
> devices since they support more than 16 physical ports.
> 
> Add a mv88e6xxx_pvt_setup helper to set the 4-bit port PVT mode, which
> will be extended later to also initialize the PVT content.
> 
> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew