linux-kernel - Re: [patch net v3] net: dsa: microchip: ksz9477: fix fdb

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Message-ID: <20220816184833.ak2cawbycws7mdzf@skbuf>
Date:   Tue, 16 Aug 2022 21:48:33 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Arun Ramadoss <arun.ramadoss@...rochip.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.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>,
        Russell King <linux@...linux.org.uk>,
        Tristram Ha <Tristram.Ha@...rochip.com>
Subject: Re: [patch net v3] net: dsa: microchip: ksz9477: fix fdb_dump last
 invalid entry

On Tue, Aug 16, 2022 at 04:25:16PM +0530, Arun Ramadoss wrote:
> In the ksz9477_fdb_dump function it reads the ALU control register and
> exit from the timeout loop if there is valid entry or search is
> complete. After exiting the loop, it reads the alu entry and report to
> the user space irrespective of entry is valid. It works till the valid
> entry. If the loop exited when search is complete, it reads the alu
> table. The table returns all ones and it is reported to user space. So
> bridge fdb show gives ff:ff:ff:ff:ff:ff as last entry for every port.
> To fix it, after exiting the loop the entry is reported only if it is
> valid one.
> 
> Fixes: b987e98e50ab ("dsa: add DSA switch driver for Microchip KSZ9477")
> Signed-off-by: Arun Ramadoss <arun.ramadoss@...rochip.com>
> ---

Reviewed-by: Vladimir Oltean <olteanv@...il.com>