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net: dsa: notify drivers of MAC address changes on user ports

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In some cases, drivers may need to veto the changing of a MAC address on
a user port. Such is the case with KSZ9477 when it offloads a HSR device,
because it programs the MAC address of multiple ports to a shared
hardware register. Those ports need to have equal MAC addresses for the
lifetime of the HSR offload.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Vladimir Oltean 2023-09-22 15:31:05 +02:00 committed by Paolo Abeni
parent fefe5dc4af
commit 6715042cd1
2 changed files with 17 additions and 0 deletions
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10
include/net/dsa.h
View File

@ -969,6 +969,16 @@ struct dsa_switch_ops {
struct phy_device *phy);
void (*port_disable)(struct dsa_switch *ds, int port);
/*
* Notification for MAC address changes on user ports. Drivers can
* currently only veto operations. They should not use the method to
* program the hardware, since the operation is not rolled back in case
* of other errors.
*/
int (*port_set_mac_address)(struct dsa_switch *ds, int port,
const unsigned char *addr);
/*
* Compatibility between device trees defining multiple CPU ports and
* drivers which are not OK to use by default the numerically smallest

7
net/dsa/slave.c
View File

@ -457,6 +457,13 @@ static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
if (ds->ops->port_set_mac_address) {
err = ds->ops->port_set_mac_address(ds, dp->index,
addr->sa_data);
if (err)
return err;
}
/* If the port is down, the address isn't synced yet to hardware or
* to the DSA master, so there is nothing to change.
*/