linux-kernel - [PATCH 3/3] net: marvell: prestera: force good base mac

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Date: Mon, 11 Mar 2024 15:51:12 +0200
From: Elad Nachman <enachman@...vell.com>
To: <taras.chornyi@...ision.eu>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>, <andrew@...n.ch>,
        <kory.maincent@...tlin.com>, <thomas.petazzoni@...tlin.com>,
        <miquel.raynal@...tlin.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: <enachman@...vell.com>
Subject: [PATCH 3/3] net: marvell: prestera: force good base mac

From: Elad Nachman <enachman@...vell.com>

Since each switchport MAC address uses the switch base mac address
and adds the physical port number to it,
Force the last byte of the switch base mac address to be at
least 128, so when adding to it, we will not wrap around the
previous (more significant) mac address byte, resulting in a
warning message.

Signed-off-by: Elad Nachman <enachman@...vell.com>
---
 drivers/net/ethernet/marvell/prestera/prestera_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera_main.c b/drivers/net/ethernet/marvell/prestera/prestera_main.c
index bcaa8ea27b49..e17b1a24fe18 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_main.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_main.c
@@ -859,7 +859,9 @@ static int prestera_switch_set_base_mac_addr(struct prestera_switch *sw)
 	if (sw->np)
 		ret = of_get_mac_address(sw->np, sw->base_mac);
 	if (!is_valid_ether_addr(sw->base_mac) || ret) {
-		eth_random_addr(sw->base_mac);
+		do {
+			eth_random_addr(sw->base_mac);
+		} while (sw->base_mac[5] > 0x80);
 		dev_info(prestera_dev(sw), "using random base mac address\n");
 	}
 
-- 
2.25.1