netdev - [PATCH] net: moxa: MAC address reading, generating, validity checking

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Message-Id: <20220817171043.459267-1-saproj@gmail.com>
Date:   Wed, 17 Aug 2022 20:10:43 +0300
From:   Sergei Antonov <saproj@...il.com>
To:     netdev@...r.kernel.org
Cc:     Sergei Antonov <saproj@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Jakub Kicinski <kuba@...nel.org>,
        Vladimir Oltean <olteanv@...il.com>,
        Yang Yingliang <yangyingliang@...wei.com>,
        Pavel Skripkin <paskripkin@...il.com>,
        Yang Wei <yang.wei9@....com.cn>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] net: moxa: MAC address reading, generating, validity checking

This device does not remember its MAC address, so add a possibility
to get it from the platform. If it fails, generate a random address.
This will provide a MAC address early during boot without user space
being involved.

Also remove extra calls to is_valid_ether_addr().

Made after suggestions by Andrew Lunn:
1) Use eth_hw_addr_random() to assign a random MAC address during probe.
2) Remove is_valid_ether_addr() from moxart_mac_open()
3) Add a call to platform_get_ethdev_address() during probe
4) Remove is_valid_ether_addr() from moxart_set_mac_address(). The core does this

Signed-off-by: Sergei Antonov <saproj@...il.com>
Suggested-by: Andrew Lunn <andrew@...n.ch>
CC: Jakub Kicinski <kuba@...nel.org>
CC: Vladimir Oltean <olteanv@...il.com>
CC: Yang Yingliang <yangyingliang@...wei.com>
CC: Pavel Skripkin <paskripkin@...il.com>
CC: Yang Wei <yang.wei9@....com.cn>
CC: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/net/ethernet/moxa/moxart_ether.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/moxa/moxart_ether.c b/drivers/net/ethernet/moxa/moxart_ether.c
index f11f1cb92025..7b11efe629a5 100644
--- a/drivers/net/ethernet/moxa/moxart_ether.c
+++ b/drivers/net/ethernet/moxa/moxart_ether.c
@@ -62,9 +62,6 @@ static int moxart_set_mac_address(struct net_device *ndev, void *addr)
 {
 	struct sockaddr *address = addr;
 
-	if (!is_valid_ether_addr(address->sa_data))
-		return -EADDRNOTAVAIL;
-
 	eth_hw_addr_set(ndev, address->sa_data);
 	moxart_update_mac_address(ndev);
 
@@ -172,9 +169,6 @@ static int moxart_mac_open(struct net_device *ndev)
 {
 	struct moxart_mac_priv_t *priv = netdev_priv(ndev);
 
-	if (!is_valid_ether_addr(ndev->dev_addr))
-		return -EADDRNOTAVAIL;
-
 	napi_enable(&priv->napi);
 
 	moxart_mac_reset(ndev);
@@ -539,6 +533,11 @@ static int moxart_mac_probe(struct platform_device *pdev)
 
 	SET_NETDEV_DEV(ndev, &pdev->dev);
 
+	ret = platform_get_ethdev_address(p_dev, ndev);
+	if (ret)
+		eth_hw_addr_random(ndev);
+	moxart_update_mac_address(ndev);
+
 	ret = register_netdev(ndev);
 	if (ret)
 		goto init_fail;
-- 
2.32.0