netdev - Re: [PATCH net-next v4] hinic: add set_channels ethtool

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Date:   Mon, 1 Jun 2020 06:54:11 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     netdev@...r.kernel.org
Cc:     Luo bin <luobin9@...wei.com>, davem@...emloft.net,
        linux-kernel@...r.kernel.org, luoxianjun@...wei.com,
        yin.yinshi@...wei.com, cloud.wangxiaoyun@...wei.com
Subject: Re: [PATCH net-next v4] hinic: add set_channels ethtool_ops support

On Mon, Jun 01, 2020 at 09:42:06AM +0000, Luo bin wrote:
> add support to change TX/RX queue number with ethtool -L ethx combined
> 
> Signed-off-by: Luo bin <luobin9@...wei.com>
> ---
[...]

The patch looks correct but I'm not sure how is this change

> diff --git a/drivers/net/ethernet/huawei/hinic/hinic_tx.c b/drivers/net/ethernet/huawei/hinic/hinic_tx.c
> index 4c66a0bc1b28..6da761d7a6ef 100644
> --- a/drivers/net/ethernet/huawei/hinic/hinic_tx.c
> +++ b/drivers/net/ethernet/huawei/hinic/hinic_tx.c
> @@ -470,6 +470,11 @@ 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;
> +	}
> +
>  	txq = &nic_dev->txqs[q_id];
>  	qp = container_of(txq->sq, struct hinic_qp, sq);
>  

related to the rest. It rather looks as a fix/workaround for a race
condition you encountered while testing it but which could also happen
under other circumstances.

Michal