[PATCHv3] ethernet: aquantia: Try MAC address from device tree

[PATCHv3] ethernet: aquantia: Try MAC address from device tree

[Tianhao Chai]

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@gmail.com>
---
 .../net/ethernet/aquantia/atlantic/aq_nic.c   | 24 +++++++++++--------
 1 file changed, 14 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..2a1ab154f681 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
@@ -316,18 +316,22 @@ 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 (platform_get_ethdev_address(&self->pdev->dev, self->ndev) != 0) {
+		// If DT has none or an invalid one, ask device for MAC address
+		mutex_lock(&self->fwreq_mutex);
+		err = self->aq_fw_ops->get_mac_permanent(self->aq_hw, addr);
+		mutex_unlock(&self->fwreq_mutex);
 
-	eth_hw_addr_set(self->ndev, addr);
+		if (err)
+			goto err_exit;
 
-	if (!is_valid_ether_addr(self->ndev->dev_addr) ||
-	    !aq_nic_is_valid_ether_addr(self->ndev->dev_addr)) {
-		netdev_warn(self->ndev, "MAC is invalid, will use random.");
-		eth_hw_addr_random(self->ndev);
+		if (is_valid_ether_addr(addr) &&
+		    aq_nic_is_valid_ether_addr(addr)) {
+			eth_hw_addr_set(self->ndev, addr);
+		} else {
+			netdev_warn(self->ndev, "MAC is invalid, will use random.");
+			eth_hw_addr_random(self->ndev);
+		}
 	}
 
 #if defined(AQ_CFG_MAC_ADDR_PERMANENT)
-- 
2.30.2

Re: [EXT] [PATCHv3] ethernet: aquantia: Try MAC address from device tree

[Igor Russkikh]

Hi Tianhao,

> 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@gmail.com>
Reviewed-by: Igor Russkikh <irusskikh@marvell.com>

Regards,
  Igor

Re: [PATCHv3] ethernet: aquantia: Try MAC address from device tree

[Hector Martin]

On 01/12/2021 11.57, 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@gmail.com>
> ---
>   .../net/ethernet/aquantia/atlantic/aq_nic.c   | 24 +++++++++++--------
>   1 file changed, 14 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..2a1ab154f681 100644
> --- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
> +++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
> @@ -316,18 +316,22 @@ 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 (platform_get_ethdev_address(&self->pdev->dev, self->ndev) != 0) {
> +		// If DT has none or an invalid one, ask device for MAC address
> +		mutex_lock(&self->fwreq_mutex);
> +		err = self->aq_fw_ops->get_mac_permanent(self->aq_hw, addr);
> +		mutex_unlock(&self->fwreq_mutex);
>   
> -	eth_hw_addr_set(self->ndev, addr);
> +		if (err)
> +			goto err_exit;
>   
> -	if (!is_valid_ether_addr(self->ndev->dev_addr) ||
> -	    !aq_nic_is_valid_ether_addr(self->ndev->dev_addr)) {
> -		netdev_warn(self->ndev, "MAC is invalid, will use random.");
> -		eth_hw_addr_random(self->ndev);
> +		if (is_valid_ether_addr(addr) &&
> +		    aq_nic_is_valid_ether_addr(addr)) {
> +			eth_hw_addr_set(self->ndev, addr);
> +		} else {
> +			netdev_warn(self->ndev, "MAC is invalid, will use random.");
> +			eth_hw_addr_random(self->ndev);
> +		}
>   	}
>   
>   #if defined(AQ_CFG_MAC_ADDR_PERMANENT)
> 

Reviewed-by: Hector Martin <marcan@marcan.st>

-- 
Hector Martin (marcan@marcan.st)
Public Key: https://mrcn.st/pub

Re: [PATCHv3] ethernet: aquantia: Try MAC address from device tree

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@davemloft.net>:

On Tue, 30 Nov 2021 20:57:06 -0600 you 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.
> 
> [...]

Here is the summary with links:
  - [PATCHv3] ethernet: aquantia: Try MAC address from device tree
    https://git.kernel.org/netdev/net/c/553217c24426

You are awesome, thank you!
-- 
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