netdev - [RFC net-next 3/6] ethernet: prestera: use eth_hw_addr_set

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Date:   Fri, 15 Oct 2021 12:38:45 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     netdev@...r.kernel.org
Cc:     olteanv@...il.com, andrew@...n.ch, idosch@...sch.org,
        f.fainelli@...il.com, Jakub Kicinski <kuba@...nel.org>,
        vkochan@...vell.com, tchornyi@...vell.com
Subject: [RFC net-next 3/6] ethernet: prestera: use eth_hw_addr_set_port()

Commit 406f42fa0d3c ("net-next: When a bond have a massive amount
of VLANs...") introduced a rbtree for faster Ethernet address look
up. To maintain netdev->dev_addr in this tree we need to make all
the writes to it got through appropriate helpers.

We need to make sure the last byte is zeroed.

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: vkochan@...vell.com
CC: tchornyi@...vell.com
---
 drivers/net/ethernet/marvell/prestera/prestera_main.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera_main.c b/drivers/net/ethernet/marvell/prestera/prestera_main.c
index b667f560b931..7d179927dabe 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_main.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_main.c
@@ -290,6 +290,7 @@ static int prestera_port_create(struct prestera_switch *sw, u32 id)
 {
 	struct prestera_port *port;
 	struct net_device *dev;
+	u8 addr[ETH_ALEN] = {};
 	int err;
 
 	dev = alloc_etherdev(sizeof(*port));
@@ -341,8 +342,8 @@ static int prestera_port_create(struct prestera_switch *sw, u32 id)
 	/* firmware requires that port's MAC address consist of the first
 	 * 5 bytes of the base MAC address
 	 */
-	memcpy(dev->dev_addr, sw->base_mac, dev->addr_len - 1);
-	dev->dev_addr[dev->addr_len - 1] = port->fp_id;
+	memcpy(addr, sw->base_mac, dev->addr_len - 1);
+	eth_hw_addr_set_port(dev, addr, port->fp_id);
 
 	err = prestera_hw_port_mac_set(port, dev->dev_addr);
 	if (err) {
-- 
2.31.1