netdev - Re: [PATCH net 1/3] net: hns3: fix for TX queue not restarted problem

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Message-ID: <fbb92429-7242-3716-0f53-35e6b83aeeb2@huawei.com>
Date:   Wed, 4 Dec 2019 09:32:17 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     David Miller <davem@...emloft.net>
CC:     <tanhuazhong@...wei.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <salil.mehta@...wei.com>,
        <yisen.zhuang@...wei.com>, <linuxarm@...wei.com>,
        <jakub.kicinski@...ronome.com>
Subject: Re: [PATCH net 1/3] net: hns3: fix for TX queue not restarted problem

On 2019/12/3 16:48, David Miller wrote:
> From: Yunsheng Lin <linyunsheng@...wei.com>
> Date: Tue, 3 Dec 2019 12:28:22 +0800
> 
>> On 2019/12/3 11:25, David Miller wrote:
>>> From: Huazhong Tan <tanhuazhong@...wei.com>
>>> Date: Tue, 3 Dec 2019 11:08:53 +0800
>>>
>>>> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
>>>> index ba05368..b2bb8e2 100644
>>>> --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
>>>> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
>>>> @@ -1286,13 +1286,16 @@ static bool hns3_skb_need_linearized(struct sk_buff *skb, unsigned int *bd_size,
>>>>  	return false;
>>>>  }
>>>>  
>>>> -static int hns3_nic_maybe_stop_tx(struct hns3_enet_ring *ring,
>>>> +static int hns3_nic_maybe_stop_tx(struct net_device *netdev,
>>>>  				  struct sk_buff **out_skb)
>>>>  {
>>>> +	struct hns3_nic_priv *priv = netdev_priv(netdev);
>>>>  	unsigned int bd_size[HNS3_MAX_TSO_BD_NUM + 1U];
>>>>  	struct sk_buff *skb = *out_skb;
>>>> +	struct hns3_enet_ring *ring;
>>>>  	unsigned int bd_num;
>>>>  
>>>> +	ring = &priv->ring[skb->queue_mapping];
>>>
>>> Please just pass the ring pointer into hns3_nic_maybe_stop_tx() instead of
>>> needlessly recalculating it.
>>
>> The reason that I am passing the netdev instead of ring pointer is
>> that the netif_start_subqueue() need a netdev parameter, and the
>> netdev can not be derived from the ring pointer.
>>
>> Do you think it is better to keep it as this patch, or add a new
>> netdevice parameter? like below:
> 
> Just add the netdev parameter, in addition to the ring parameter.
> 
> All arguments fit in the register argument passing conventions of
> various cpus so the cost of adding the parameter is zero.

Ok, thanks.

> 
> .
>