linux-kernel - Re: [PATCH v2 3/5] net: dsa: implement vtu_getnext and vtu

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Message-ID: <20190524140206.GF17138@t480s.localdomain>
Date:   Fri, 24 May 2019 14:02:06 -0400
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Rasmus Villemoes <Rasmus.Villemoes@...vas.se>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/5] net: dsa: implement vtu_getnext and vtu_loadpurge
 for mv88e6250

On Fri, 24 May 2019 09:00:27 +0000, Rasmus Villemoes <rasmus.villemoes@...vas.dk> wrote:
> These are almost identical to the 6185 variants, but have fewer bits
> for the FID.
> 
> Bit 10 of the VTU_OP register (offset 0x05) is the VidPolicy bit,
> which one should probably preserve in mv88e6xxx_g1_vtu_op(), instead
> of always writing a 0. However, on the 6352 family, that bit is
> located at bit 12 in the VTU FID register (offset 0x02), and is always
> unconditionally cleared by the mv88e6xxx_g1_vtu_fid_write()
> function.
> 
> Since nothing in the existing driver seems to know or care about that
> bit, it seems reasonable to not add the boilerplate to preserve it for
> the 6250 (which would require adding a chip-specific vtu_op function,
> or adding chip-quirks to the existing one).
> 
> Reviewed-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Rasmus Villemoes <rasmus.villemoes@...vas.dk>

Reviewed-by: Vivien Didelot <vivien.didelot@...il.com>