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 20:14:29 -0700
From:   Joe Perches <joe@...ches.com>
To:     liuyonglong <liuyonglong@...wei.com>,
        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>
Subject: Re: [PATCH V2 net-next 07/11] net: hns3: adds debug messages to
 identify eth down cause

On Sat, 2019-07-27 at 10:28 +0800, liuyonglong wrote:
> On 2019/7/27 6:18, Joe Perches wrote:
> > 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")
> > 
> 
> Hi, Saeed && Joe:
> For our cases, maybe netif_info() can be use for HNS3 drivers?
> netif_dbg need to open dynamic debug options additional.

Your code, your choice.

I do think littering dmesg with "net open" style messages
and such may be unnecessary.  KERN_DEBUG seems a more
appropriate log level.