netdev - Re: [PATCH net v1 1/6] net: dsa: microchip: ksz8: fix ksz8_fdb

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Date:   Fri, 24 Mar 2023 04:20:46 +0000
From:   <Arun.Ramadoss@...rochip.com>
To:     <olteanv@...il.com>, <andrew@...n.ch>, <f.fainelli@...il.com>,
        <kuba@...nel.org>, <edumazet@...gle.com>, <pabeni@...hat.com>,
        <o.rempel@...gutronix.de>, <Woojung.Huh@...rochip.com>,
        <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <UNGLinuxDriver@...rochip.com>, <kernel@...gutronix.de>
Subject: Re: [PATCH net v1 1/6] net: dsa: microchip: ksz8: fix ksz8_fdb_dump()

Hi Oleksij,

On Wed, 2023-03-22 at 15:31 +0100, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> Before this patch, the ksz8_fdb_dump() function had several issues,
> such
> as uninitialized variables and incorrect usage of source port as a
> bit
> mask. These problems caused inaccurate reporting of vid information
> and
> port assignment in the bridge fdb.
> 
> Fixes: e587be759e6e ("net: dsa: microchip: update fdb add/del/dump in
> ksz_common")
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/dsa/microchip/ksz8795.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/dsa/microchip/ksz8795.c
> b/drivers/net/dsa/microchip/ksz8795.c
> index 003b0ac2854c..3fffd5da8d3b 100644
> --- a/drivers/net/dsa/microchip/ksz8795.c
> +++ b/drivers/net/dsa/microchip/ksz8795.c
> @@ -958,15 +958,14 @@ int ksz8_fdb_dump(struct ksz_device *dev, int
> port,
>         u16 entries = 0;
>         u8 timestamp = 0;
>         u8 fid;
> -       u8 member;
> -       struct alu_struct alu;
> +       u8 src_port;
> +       u8 mac[ETH_ALEN];
> 
>         do {
> -               alu.is_static = false;
> -               ret = ksz8_r_dyn_mac_table(dev, i, alu.mac, &fid,
> &member,
> +               ret = ksz8_r_dyn_mac_table(dev, i, mac, &fid,
> &src_port,
>                                            &timestamp, &entries);
> -               if (!ret && (member & BIT(port))) {
> -                       ret = cb(alu.mac, alu.fid, alu.is_static,
> data);
> +               if (!ret && port == src_port) {

Only in KSZ9477 series, it is BIT(port). For the KSZ87xx and KSZ88xx,
it is like logic table. i.e 
00 = port 0
01 = port 1
02 = port 2

Cross Verified with the Datasheet.

Acked-by: Arun Ramadoss <arun.ramadoss@...rochip.com>


> +                       ret = cb(mac, fid, false, data);
>                         if (ret)
>                                 break;
>                 }
> --
> 2.30.2
>