This is a note to let you know that I've just added the patch titled
net: lan966x: Fix assignment of the MAC address
to the 5.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-lan966x-fix-assignment-of-the-mac-address.patch
and it can be found in the queue-5.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 23ddbd55c2bd2ea8e4dce92db9f6ad661debf92a
Author: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
Date: Fri May 13 20:00:30 2022 +0200
net: lan966x: Fix assignment of the MAC address
[ Upstream commit af8ca6eaa9b24a90484218e356f959a94bff22fa ]
The following two scenarios were failing for lan966x.
1. If the port had the address X and then trying to assign the same
address, then the HW was just removing this address because first it
tries to learn new address and then delete the old one. As they are
the same the HW remove it.
2. If the port eth0 was assigned the same address as one of the other
ports eth1 then when assigning back the address to eth0 then the HW
was deleting the address of eth1.
The case 1. is fixed by checking if the port has already the same
address while case 2. is fixed by checking if the address is used by any
other port.
Fixes: e18aba8941b40b ("net: lan966x: add mactable support")
Signed-off-by: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220513180030.3076793-1-horatiu.vultur@xxxxxxxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
index 1f60fd125a1d..fee148bbf13e 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
@@ -100,6 +100,24 @@ static int lan966x_create_targets(struct platform_device *pdev,
return 0;
}
+static bool lan966x_port_unique_address(struct net_device *dev)
+{
+ struct lan966x_port *port = netdev_priv(dev);
+ struct lan966x *lan966x = port->lan966x;
+ int p;
+
+ for (p = 0; p < lan966x->num_phys_ports; ++p) {
+ port = lan966x->ports[p];
+ if (!port || port->dev == dev)
+ continue;
+
+ if (ether_addr_equal(dev->dev_addr, port->dev->dev_addr))
+ return false;
+ }
+
+ return true;
+}
+
static int lan966x_port_set_mac_address(struct net_device *dev, void *p)
{
struct lan966x_port *port = netdev_priv(dev);
@@ -107,16 +125,26 @@ static int lan966x_port_set_mac_address(struct net_device *dev, void *p)
const struct sockaddr *addr = p;
int ret;
+ if (ether_addr_equal(addr->sa_data, dev->dev_addr))
+ return 0;
+
/* Learn the new net device MAC address in the mac table. */
ret = lan966x_mac_cpu_learn(lan966x, addr->sa_data, HOST_PVID);
if (ret)
return ret;
+ /* If there is another port with the same address as the dev, then don't
+ * delete it from the MAC table
+ */
+ if (!lan966x_port_unique_address(dev))
+ goto out;
+
/* Then forget the previous one. */
ret = lan966x_mac_cpu_forget(lan966x, dev->dev_addr, HOST_PVID);
if (ret)
return ret;
+out:
eth_hw_addr_set(dev, addr->sa_data);
return ret;
}
