Re: [PATCH net-next 4/4] net: dsa: mt7530: always install FDB entries with IVL and FID 1

[Vladimir Oltean]

On Tue, Aug 03, 2021 at 08:40:22PM +0800, DENG Qingfang wrote:
> This reverts commit 7e777021780e ("mt7530 mt7530_fdb_write only set ivl
> bit vid larger than 1").
> 
> Before this series, the default value of all ports' PVID is 1, which is
> copied into the FDB entry, even if the ports are VLAN unaware. So
> `bridge fdb show` will show entries like `dev swp0 vlan 1 self` even on
> a VLAN-unaware bridge.
> 
> The blamed commit does not solve that issue completely, instead it may
> cause a new issue that FDB is inaccessible in a VLAN-aware bridge with
> PVID 1.
> 
> This series sets PVID to 0 on VLAN-unaware ports, so `bridge fdb show`
> will no longer print `vlan 1` on VLAN-unaware bridges, and that special
> case in fdb_write is not required anymore.
> 
> Set FDB entries' filter ID to 1 to match the VLAN table.
> 
> Signed-off-by: DENG Qingfang <dqfext@xxxxxxxxx>
> ---
> RFC -> v1: Detailed commit message. Also set FDB entries' FID to 1.
> 
>  drivers/net/dsa/mt7530.c | 4 ++--
>  drivers/net/dsa/mt7530.h | 1 +
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> index 8d84d7ddad38..ac2b45e472bd 100644
> --- a/drivers/net/dsa/mt7530.c
> +++ b/drivers/net/dsa/mt7530.c
> @@ -366,8 +366,8 @@ mt7530_fdb_write(struct mt7530_priv *priv, u16 vid,
>  	int i;
>  
>  	reg[1] |= vid & CVID_MASK;
> -	if (vid > 1)
> -		reg[1] |= ATA2_IVL;
> +	reg[1] |= ATA2_IVL;
> +	reg[1] |= ATA2_FID(1);

Maybe it would be good to resend with a set of #defines for the
standalone/bridged port FID values after all, what do you think?

>  	reg[2] |= (aging & AGE_TIMER_MASK) << AGE_TIMER;
>  	reg[2] |= (port_mask & PORT_MAP_MASK) << PORT_MAP;
>  	/* STATIC_ENT indicate that entry is static wouldn't
> diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
> index 53b7bb1f5368..73b0e0eb8f2f 100644
> --- a/drivers/net/dsa/mt7530.h
> +++ b/drivers/net/dsa/mt7530.h
> @@ -80,6 +80,7 @@ enum mt753x_bpdu_port_fw {
>  #define  STATIC_ENT			3
>  #define MT7530_ATA2			0x78
>  #define  ATA2_IVL			BIT(15)
> +#define  ATA2_FID(x)			(((x) & 0x7) << 12)
>  
>  /* Register for address table write data */
>  #define MT7530_ATWD			0x7c
> -- 
> 2.25.1
>