linux-kernel - Re: [PATCHv2] ethernet: aquantia: Try MAC address from device tree

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Date:   Tue, 30 Nov 2021 08:59:37 +0200
From:   Julian Wiedmann <jwi@...ux.ibm.com>
To:     Tianhao Chai <cth451@...il.com>,
        Igor Russkikh <irusskikh@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>
Subject: Re: [PATCHv2] ethernet: aquantia: Try MAC address from device tree

On 30.11.21 06:51, Tianhao Chai wrote:
> Apple M1 Mac minis (2020) with 10GE NICs do not have MAC address in the
> card, but instead need to obtain MAC addresses from the device tree. In
> this case the hardware will report an invalid MAC.
> 
> Currently atlantic driver does not query the DT for MAC address and will
> randomly assign a MAC if the NIC doesn't have a permanent MAC burnt in.
> This patch causes the driver to perfer a valid MAC address from OF (if
> present) over HW self-reported MAC and only fall back to a random MAC
> address when neither of them is valid.
> 
> Signed-off-by: Tianhao Chai <cth451@...il.com>
> ---
>  .../net/ethernet/aquantia/atlantic/aq_nic.c   | 27 ++++++++++++-------
>  1 file changed, 17 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
> index 1acf544afeb4..ad89721c1cf6 100644
> --- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
> +++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
> @@ -316,18 +316,25 @@ int aq_nic_ndev_register(struct aq_nic_s *self)
>  	aq_macsec_init(self);
>  #endif
>  
> -	mutex_lock(&self->fwreq_mutex);
> -	err = self->aq_fw_ops->get_mac_permanent(self->aq_hw, addr);
> -	mutex_unlock(&self->fwreq_mutex);
> -	if (err)
> -		goto err_exit;
> +	if (eth_platform_get_mac_address(&self->pdev->dev, addr) == 0) {
> +		// DT supplied a valid MAC address
> +		eth_hw_addr_set(self->ndev, addr);

Can you use platform_get_ethdev_address() instead?