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Message-ID: <20230616101108.wq5aote3yjpekilu@skbuf>
Date: Fri, 16 Jun 2023 13:11:08 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: arinc9.unal@...il.com
Cc: Arınç ÜNAL <arinc.unal@...nc9.com>,
Daniel Golle <daniel@...rotopia.org>,
Landen Chao <Landen.Chao@...iatek.com>,
DENG Qingfang <dqfext@...il.com>,
Sean Wang <sean.wang@...iatek.com>,
Andrew Lunn <andrew@...n.ch>,
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>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Russell King <linux@...linux.org.uk>,
Frank Wunderlich <frank-w@...lic-files.de>,
Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
mithat.guner@...ont.com, erkin.bozoglu@...ont.com,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net v5 3/6] net: dsa: mt7530: fix handling of BPDUs on
MT7530 switch
On Fri, Jun 16, 2023 at 05:53:24AM +0300, arinc9.unal@...il.com wrote:
> From: Arınç ÜNAL <arinc.unal@...nc9.com>
>
> BPDUs are link-local frames, therefore they must be trapped to the CPU
> port. Currently, the MT7530 switch treats BPDUs as regular multicast
> frames, therefore flooding them to user ports. To fix this, set BPDUs to be
> trapped to the CPU port.
>
> Fixes: b8f126a8d543 ("net-next: dsa: add dsa support for Mediatek MT7530 switch")
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> ---
> drivers/net/dsa/mt7530.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> index e9fbe7ae6c2c..7b72cf3a0e30 100644
> --- a/drivers/net/dsa/mt7530.c
> +++ b/drivers/net/dsa/mt7530.c
> @@ -2262,6 +2262,10 @@ mt7530_setup(struct dsa_switch *ds)
>
> priv->p6_interface = PHY_INTERFACE_MODE_NA;
>
> + /* Trap BPDUs to the CPU port */
> + mt7530_rmw(priv, MT753X_BPC, MT753X_BPDU_PORT_FW_MASK,
> + MT753X_BPDU_CPU_ONLY);
> +
> /* Enable and reset MIB counters */
> mt7530_mib_reset(ds);
>
> --
> 2.39.2
>
Ok, so this issue dates back to v4.12, but the patch won't apply that
far due to the difference in patch context.
Since the definition itself of the MT753X_BPC register was added as part
of commit c288575f7810 ("net: dsa: mt7530: Add the support of MT7531
switch") - dated v5.10 - then this patch cannot be practically be
backported beyond that.
So I see no possible objection to the request I'm about to make, which is:
please group this and the identical logic from mt7531_setup() into a
common function and call that.
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