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 22:00:46 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "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 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.
> 
> Signed-off-by: Yonglong Liu <liuyonglong@...wei.com>
> Signed-off-by: Peng Li <lipeng321@...wei.com>
> Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
> ---
>  drivers/net/ethernet/hisilicon/hns3/hns3_enet.c    | 24
> ++++++++++++++++++++
>  drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c | 26
> ++++++++++++++++++++++
>  .../net/ethernet/hisilicon/hns3/hns3pf/hclge_dcb.c | 14 ++++++++++++
>  3 files changed, 64 insertions(+)
> 
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> index 4d58c53..2e30cfa 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> +++ b/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);         \
})
#endif