linux-kernel - Re: [PATCH V5 net-next 05/11] net: hibmcge: Implement some .ndo functions

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Message-ID: <20240829074339.426e298b@kernel.org>
Date: Thu, 29 Aug 2024 07:43:39 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Jijie Shao <shaojijie@...wei.com>
Cc: <davem@...emloft.net>, <edumazet@...gle.com>, <pabeni@...hat.com>,
 <shenjian15@...wei.com>, <wangpeiyang1@...wei.com>,
 <liuyonglong@...wei.com>, <chenhao418@...wei.com>,
 <sudongming1@...wei.com>, <xujunsheng@...wei.com>,
 <shiyongbang@...wei.com>, <libaihan@...wei.com>, <andrew@...n.ch>,
 <jdamato@...tly.com>, <horms@...nel.org>, <jonathan.cameron@...wei.com>,
 <shameerali.kolothum.thodi@...wei.com>, <salil.mehta@...wei.com>,
 <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V5 net-next 05/11] net: hibmcge: Implement some .ndo
 functions

On Thu, 29 Aug 2024 10:40:07 +0800 Jijie Shao wrote:
> on 2024/8/29 9:39, Jakub Kicinski wrote:
> > On Tue, 27 Aug 2024 21:14:49 +0800 Jijie Shao wrote:  
> >> +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.