[PATCH net v3] net: usb: ax88179_178a: avoid the interface always configured as random address

[PATCH net v3] net: usb: ax88179_178a: avoid the interface always configured as random address

[Jose Ignacio Tornos Martinez]

After the commit d2689b6a86b9 ("net: usb: ax88179_178a: avoid two
consecutive device resets"), reset is not executed from bind operation and
mac address is not read from the device registers or the devicetree at that
moment. Since the check to configure if the assigned mac address is random
or not for the interface, happens after the bind operation from
usbnet_probe, the interface keeps configured as random address, although the
address is correctly read and set during open operation (the only reset
now).

In order to keep only one reset for the device and to avoid the interface
always configured as random address, after reset, configure correctly the
suitable field from the driver, if the mac address is read successfully from
the device registers or the devicetree.

cc: stable@vger.kernel.org # 6.6+
Fixes: d2689b6a86b9 ("net: usb: ax88179_178a: avoid two consecutive device resets")
Reported-by: Dave Stevenson  <dave.stevenson@raspberrypi.com>
Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>
---
v3:
  - Send the patch separately to net.
v2:
  - Split the fix and the improvement in two patches as Simon Horman
suggests.
v1: https://lore.kernel.org/netdev/20240325173155.671807-1-jtornosm@redhat.com/

 drivers/net/usb/ax88179_178a.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
index 88e084534853..8ca8ace93d9c 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -1273,6 +1273,7 @@ static void ax88179_get_mac_addr(struct usbnet *dev)
 
 	if (is_valid_ether_addr(mac)) {
 		eth_hw_addr_set(dev->net, mac);
+		dev->net->addr_assign_type = NET_ADDR_PERM;
 	} else {
 		netdev_info(dev->net, "invalid MAC address, using random\n");
 		eth_hw_addr_random(dev->net);
-- 
2.44.0

Re: [PATCH net v3] net: usb: ax88179_178a: avoid the interface always configured as random address

[Simon Horman]

On Mon, Apr 01, 2024 at 10:19:50AM +0200, Jose Ignacio Tornos Martinez wrote:
> After the commit d2689b6a86b9 ("net: usb: ax88179_178a: avoid two
> consecutive device resets"), reset is not executed from bind operation and
> mac address is not read from the device registers or the devicetree at that
> moment. Since the check to configure if the assigned mac address is random
> or not for the interface, happens after the bind operation from
> usbnet_probe, the interface keeps configured as random address, although the
> address is correctly read and set during open operation (the only reset
> now).
> 
> In order to keep only one reset for the device and to avoid the interface
> always configured as random address, after reset, configure correctly the
> suitable field from the driver, if the mac address is read successfully from
> the device registers or the devicetree.
> 
> cc: stable@vger.kernel.org # 6.6+
> Fixes: d2689b6a86b9 ("net: usb: ax88179_178a: avoid two consecutive device resets")
> Reported-by: Dave Stevenson  <dave.stevenson@raspberrypi.com>
> Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>
> ---
> v3:
>   - Send the patch separately to net.
> v2:
>   - Split the fix and the improvement in two patches as Simon Horman
> suggests.
> v1: https://lore.kernel.org/netdev/20240325173155.671807-1-jtornosm@redhat.com/

Thanks for the updates.

Reviewed-by: Simon Horman <horms@kernel.org>

Re: [PATCH net v3] net: usb: ax88179_178a: avoid the interface always configured as random address

[Jakub Kicinski]

On Mon,  1 Apr 2024 10:19:50 +0200 Jose Ignacio Tornos Martinez wrote:
>  	if (is_valid_ether_addr(mac)) {
>  		eth_hw_addr_set(dev->net, mac);
> +		dev->net->addr_assign_type = NET_ADDR_PERM;

Are we 100% sure we won't read back the random address we wrote earlier?
Maybe let's put the assignment under if (!is_local_ether_addr(mac)),
just to be on the safe side?

Re: [PATCH net v3] net: usb: ax88179_178a: avoid the interface always configured as random address

[Jose Ignacio Tornos Martinez]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset=y, Size: 415 bytes --]

Hello Jakub,

You are right, good catch.
For all the cases, the mac address is going to be stored in the chip registers just in case (original behavior), and if the mac address was invalid the first time, a random one will be stored, so that when the mac address is read again from the chip registers will be a locally administered address (random).
I will complete as you say.

Thanks

Best regards
José Ignacio

[PATCH net v4] net: usb: ax88179_178a: avoid the interface always configured as random address

[Jose Ignacio Tornos Martinez]

After the commit d2689b6a86b9 ("net: usb: ax88179_178a: avoid two
consecutive device resets"), reset is not executed from bind operation and
mac address is not read from the device registers or the devicetree at that
moment. Since the check to configure if the assigned mac address is random
or not for the interface, happens after the bind operation from
usbnet_probe, the interface keeps configured as random address, although the
address is correctly read and set during open operation (the only reset
now).

In order to keep only one reset for the device and to avoid the interface
always configured as random address, after reset, configure correctly the
suitable field from the driver, if the mac address is read successfully from
the device registers or the devicetree. Take into account if a locally
administered address (random) was previously stored.

cc: stable@vger.kernel.org # 6.6+
Fixes: d2689b6a86b9 ("net: usb: ax88179_178a: avoid two consecutive device resets")
Reported-by: Dave Stevenson  <dave.stevenson@raspberrypi.com>
Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>
---
v4:
  - Add locally administerd address check as Jakub Kicinski suggests
v3:
  - Send the patch separately to net.
v2:
  - Split the fix and the improvement in two patches as Simon Horman
suggests.
v1: https://lore.kernel.org/netdev/20240325173155.671807-1-jtornosm@redhat.com/

 drivers/net/usb/ax88179_178a.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
index 88e084534853..a9c418890a1c 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -1273,6 +1273,8 @@ static void ax88179_get_mac_addr(struct usbnet *dev)
 
 	if (is_valid_ether_addr(mac)) {
 		eth_hw_addr_set(dev->net, mac);
+		if (!is_local_ether_addr(mac))
+			dev->net->addr_assign_type = NET_ADDR_PERM;
 	} else {
 		netdev_info(dev->net, "invalid MAC address, using random\n");
 		eth_hw_addr_random(dev->net);
-- 
2.44.0

Re: [PATCH net v4] net: usb: ax88179_178a: avoid the interface always configured as random address

[Simon Horman]

On Wed, Apr 03, 2024 at 03:21:58PM +0200, Jose Ignacio Tornos Martinez wrote:
> After the commit d2689b6a86b9 ("net: usb: ax88179_178a: avoid two
> consecutive device resets"), reset is not executed from bind operation and
> mac address is not read from the device registers or the devicetree at that
> moment. Since the check to configure if the assigned mac address is random
> or not for the interface, happens after the bind operation from
> usbnet_probe, the interface keeps configured as random address, although the
> address is correctly read and set during open operation (the only reset
> now).
> 
> In order to keep only one reset for the device and to avoid the interface
> always configured as random address, after reset, configure correctly the
> suitable field from the driver, if the mac address is read successfully from
> the device registers or the devicetree. Take into account if a locally
> administered address (random) was previously stored.
> 
> cc: stable@vger.kernel.org # 6.6+
> Fixes: d2689b6a86b9 ("net: usb: ax88179_178a: avoid two consecutive device resets")
> Reported-by: Dave Stevenson  <dave.stevenson@raspberrypi.com>
> Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>
> ---
> v4:
>   - Add locally administerd address check as Jakub Kicinski suggests

Reviewed-by: Simon Horman <horms@kernel.org>

Re: [PATCH net v4] net: usb: ax88179_178a: avoid the interface always configured as random address

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Wed,  3 Apr 2024 15:21:58 +0200 you wrote:
> After the commit d2689b6a86b9 ("net: usb: ax88179_178a: avoid two
> consecutive device resets"), reset is not executed from bind operation and
> mac address is not read from the device registers or the devicetree at that
> moment. Since the check to configure if the assigned mac address is random
> or not for the interface, happens after the bind operation from
> usbnet_probe, the interface keeps configured as random address, although the
> address is correctly read and set during open operation (the only reset
> now).
> 
> [...]

Here is the summary with links:
  - [net,v4] net: usb: ax88179_178a: avoid the interface always configured as random address
    https://git.kernel.org/netdev/net/c/2e91bb99b9d4

You are awesome, thank you!
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