linux-kernel - Re: [PATCH] net: atlantic: fix check for invalid ethernet addresses

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Date:   Wed, 30 Nov 2022 20:41:29 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Brian Masney <bmasney@...hat.com>
Cc:     irusskikh@...vell.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, cth451@...il.com
Subject: Re: [PATCH] net: atlantic: fix check for invalid ethernet addresses

On Wed, Nov 30, 2022 at 12:42:59PM -0500, Brian Masney wrote:
> The Qualcomm sa8540p automotive development board (QDrive3) has an
> Aquantia NIC wired over PCIe. The ethernet MAC address assigned to
> all of the boards in our lab is 00:17:b6:00:00:00. The existing
> check in aq_nic_is_valid_ether_addr() only checks for leading zeros
> in the MAC address. Let's update the check to also check for trailing
> zeros in the MAC address so that a random MAC address is assigned
> in this case.
> 
> Signed-off-by: Brian Masney <bmasney@...hat.com>
> ---
>  drivers/net/ethernet/aquantia/atlantic/aq_nic.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
> index 06508eebb585..c9c850bbc805 100644
> --- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
> +++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
> @@ -293,7 +293,8 @@ static bool aq_nic_is_valid_ether_addr(const u8 *addr)
>  	/* Some engineering samples of Aquantia NICs are provisioned with a
>  	 * partially populated MAC, which is still invalid.
>  	 */
> -	return !(addr[0] == 0 && addr[1] == 0 && addr[2] == 0);
> +	return !(addr[0] == 0 && addr[1] == 0 && addr[2] == 0) &&
> +		!(addr[3] == 0 && addr[4] == 0 && addr[5] == 0);

Hi Brian

is_valid_ether_addr()

	Andrew