linux-kernel - Re: [PATCH net 3/3] hinic: fix bug of send pkts while setting channels

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Date:   Thu, 3 Sep 2020 22:27:11 +0800
From:   "luobin (L)" <luobin9@...wei.com>
To:     David Miller <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <luoxianjun@...wei.com>, <yin.yinshi@...wei.com>,
        <cloud.wangxiaoyun@...wei.com>, <chiqijun@...wei.com>
Subject: Re: [PATCH net 3/3] hinic: fix bug of send pkts while setting
 channels

On 2020/9/3 3:52, David Miller wrote:
> From: Luo bin <luobin9@...wei.com>
> Date: Wed, 2 Sep 2020 17:41:45 +0800
> 
>> @@ -531,6 +531,11 @@ netdev_tx_t hinic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
>>  	struct hinic_txq *txq;
>>  	struct hinic_qp *qp;
>>  
>> +	if (unlikely(!netif_carrier_ok(netdev))) {
>> +		dev_kfree_skb_any(skb);
>> +		return NETDEV_TX_OK;
>> +	}
> 
> As Eric said, these kinds of tests should not be placed in the fast path
> of the driver.
> 
> If you invoke close and the core networking still sends packets to the
> driver, that's a bug that needs to be fixed in the core networking.
> .
> 
Okay, I'm trying to figure out why the core networking can still call ndo_start_xmit
after netif_tx_disable and solve the problem fundamentally. And I'll undo this patch
temporarily.