linux-kernel - Re: [PATCH V2 net-next 07/11] net: hns3: adds debug messages to identify eth down cause

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Date:   Fri, 26 Jul 2019 15:18:57 -0700
From:   Joe Perches <joe@...ches.com>
To:     Saeed Mahameed <saeedm@...lanox.com>,
        "tanhuazhong@...wei.com" <tanhuazhong@...wei.com>,
        "davem@...emloft.net" <davem@...emloft.net>
Cc:     "lipeng321@...wei.com" <lipeng321@...wei.com>,
        "yisen.zhuang@...wei.com" <yisen.zhuang@...wei.com>,
        "salil.mehta@...wei.com" <salil.mehta@...wei.com>,
        "linuxarm@...wei.com" <linuxarm@...wei.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "liuyonglong@...wei.com" <liuyonglong@...wei.com>
Subject: Re: [PATCH V2 net-next 07/11] net: hns3: adds debug messages to
 identify eth down cause

On Fri, 2019-07-26 at 22:00 +0000, Saeed Mahameed wrote:
> On Fri, 2019-07-26 at 11:24 +0800, Huazhong Tan wrote:
> > From: Yonglong Liu <liuyonglong@...wei.com>
> > 
> > Some times just see the eth interface have been down/up via
> > dmesg, but can not know why the eth down. So adds some debug
> > messages to identify the cause for this.
[]
> > diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> []
> > @@ -459,6 +459,10 @@ static int hns3_nic_net_open(struct net_device
> > *netdev)
> >  		h->ae_algo->ops->set_timer_task(priv->ae_handle, true);
> >  
> >  	hns3_config_xps(priv);
> > +
> > +	if (netif_msg_drv(h))
> > +		netdev_info(netdev, "net open\n");
> > +
> 
> to make sure this is only intended for debug, and to avoid repetition.
> #define hns3_dbg(__dev, format, args...)			\
> ({								\
> 	if (netif_msg_drv(h))					\
> 		netdev_info(h->netdev, format, ##args);         \
> })

	netif_dbg(h, drv, h->netdev, "net open\n")