On Thu, 29 Aug 2024 10:40:07 +0800 Jijie Shao wrote:

on 2024/8/29 9:39, Jakub Kicinski wrote:

quoted

On Tue, 27 Aug 2024 21:14:49 +0800 Jijie Shao wrote:  

quoted

+static int hbg_net_open(struct net_device *dev)
+{
+	struct hbg_priv *priv = netdev_priv(dev);
+
+	if (test_and_set_bit(HBG_NIC_STATE_OPEN, &priv->state))
+		return 0;
+
+	netif_carrier_off(dev);  

Why clear the carrier during open? You should probably clear it once on
the probe path and then on stop.  

In net_open(), the GMAC is not ready to receive or transmit packets.
Therefore, netif_carrier_off() is called.

Packets can be received or transmitted only after the PHY is linked.
Therefore, netif_carrier_on() should be called in adjust_link.

But why are you calling _off() during .ndo_open() ?
Surely the link is also off before ndo_open is called?

In net_stop() we also call netif_carrier_off()

Exactly, so it should already be off.