netdev - Re: [Linux-stm32] [PATCH] net: stmmac: remove the limitation of adding vlan in promisc mode

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Date:   Mon, 3 Apr 2023 10:41:51 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Clark Wang <xiaoning.wang@....com>, peppe.cavallaro@...com,
        alexandre.torgue@...s.st.com, joabreu@...opsys.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, mcoquelin.stm32@...il.com
Cc:     netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [Linux-stm32] [PATCH] net: stmmac: remove the limitation of
 adding vlan in promisc mode

Hello Clark,

On 03.04.23 10:17, Clark Wang wrote:
> When using brctl to add eqos to a bridge, it will frist set eqos to
> promisc mode and then set a VLAN for this bridge with a filer VID value
> of 1.
> 
> These two error returns limit the use of brctl, resulting in the
> inability of the bridge to be enabled on eqos. So remove them.
> 
> Signed-off-by: Clark Wang <xiaoning.wang@....com>

Please add a suitable Fixes: tag pointing at the commit introducing
the regression.

Thanks,
Ahmad

> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 12 ------------
>  1 file changed, 12 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
> index 8c7a0b7c9952..64bbe15a699e 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
> @@ -472,12 +472,6 @@ static int dwmac4_add_hw_vlan_rx_fltr(struct net_device *dev,
>  	if (vid > 4095)
>  		return -EINVAL;
>  
> -	if (hw->promisc) {
> -		netdev_err(dev,
> -			   "Adding VLAN in promisc mode not supported\n");
> -		return -EPERM;
> -	}
> -
>  	/* Single Rx VLAN Filter */
>  	if (hw->num_vlan == 1) {
>  		/* For single VLAN filter, VID 0 means VLAN promiscuous */
> @@ -527,12 +521,6 @@ static int dwmac4_del_hw_vlan_rx_fltr(struct net_device *dev,
>  {
>  	int i, ret = 0;
>  
> -	if (hw->promisc) {
> -		netdev_err(dev,
> -			   "Deleting VLAN in promisc mode not supported\n");
> -		return -EPERM;
> -	}
> -
>  	/* Single Rx VLAN Filter */
>  	if (hw->num_vlan == 1) {
>  		if ((hw->vlan_filter[0] & GMAC_VLAN_TAG_VID) == vid) {

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