linux-kernel - Re: [PATCH] staging: r8188eu: fall back to random mac address

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Date:   Thu, 14 Jul 2022 07:08:08 +0200
From:   Philipp Hortmann <philipp.g.hortmann@...il.com>
To:     Martin Kaiser <martin@...ser.cx>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Michael Straube <straube.linux@...il.com>,
        Pavel Skripkin <paskripkin@...il.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Joe Perches <joe@...ches.com>
Subject: Re: [PATCH] staging: r8188eu: fall back to random mac address

On 7/13/22 09:55, Martin Kaiser wrote:
> Call eth_random_addr to generate a random mac address if we cannot load
> the mac address from the efuses.
> 
> Do not use a constant mac address as fallback. This may create conflicts
> if we have several r8188eu devices on the network.
> 
> Suggested-by: Joe Perches <joe@...ches.com>
> Signed-off-by: Martin Kaiser <martin@...ser.cx>
> ---
>   drivers/staging/r8188eu/hal/usb_halinit.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/r8188eu/hal/usb_halinit.c b/drivers/staging/r8188eu/hal/usb_halinit.c
> index 68d012a442a8..8902dda7b8d8 100644
> --- a/drivers/staging/r8188eu/hal/usb_halinit.c
> +++ b/drivers/staging/r8188eu/hal/usb_halinit.c
> @@ -912,11 +912,10 @@ unsigned int rtl8188eu_inirp_init(struct adapter *Adapter)
>   
>   static void Hal_EfuseParseMACAddr_8188EU(struct adapter *adapt, u8 *hwinfo, bool AutoLoadFail)
>   {
> -	u8 sMacAddr[6] = {0x00, 0xE0, 0x4C, 0x81, 0x88, 0x02};
>   	struct eeprom_priv *eeprom = &adapt->eeprompriv;
>   
>   	if (AutoLoadFail) {
> -		memcpy(eeprom->mac_addr, sMacAddr, ETH_ALEN);
> +		eth_random_addr(eeprom->mac_addr);
>   	} else {
>   		/* Read Permanent MAC address */
>   		memcpy(eeprom->mac_addr, &hwinfo[EEPROM_MAC_ADDR_88EU], ETH_ALEN);

Tested with:

static void Hal_EfuseParseMACAddr_8188EU(struct adapter *adapt, u8 
*hwinfo, bool AutoLoadFail)
{
	struct eeprom_priv *eeprom = &adapt->eeprompriv;
	struct dvobj_priv *dvobj = adapter_to_dvobj(adapt);
	struct device *device = dvobj_to_dev(dvobj);

	dev_info(device, "AutoLoadFail: %i", AutoLoadFail);

	if (!AutoLoadFail) {
		eth_random_addr(eeprom->mac_addr);
	} else {
		/* Read Permanent MAC address */
		memcpy(eeprom->mac_addr, &hwinfo[EEPROM_MAC_ADDR_88EU], ETH_ALEN);
	}
	dev_info(device, "Test - MAC Address = %pM\n", eeprom->mac_addr);
}

Log:
[ 1799.018943] r8188eu 2-1.6:1.0: AutoLoadFail: 0
[ 1799.018969] r8188eu 2-1.6:1.0: Test - MAC Address = be:0a:e8:72:a8:4a
[ 1866.151995] r8188eu 2-1.6:1.0: AutoLoadFail: 0
[ 1866.152014] r8188eu 2-1.6:1.0: Test - MAC Address = 76:9b:4f:91:28:5f
[ 1900.266003] r8188eu 2-1.6:1.0: AutoLoadFail: 0
[ 1900.266008] r8188eu 2-1.6:1.0: Test - MAC Address = 5e:9d:d5:f5:ef:26


Tested-by: Philipp Hortmann <philipp.g.hortmann@...il.com> # Edimax N150