netdev - Re: [RFCv3 PATCH net-next 2/2] net-next: hn3: add tx push support in hns3 ring param process

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Date:   Tue, 29 Mar 2022 21:44:30 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Jie Wang <wangjie125@...wei.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        huangguangbin2@...wei.com, lipeng321@...wei.com,
        shenjian15@...wei.com, moyufeng@...wei.com, linyunsheng@...wei.com,
        salil.mehta@...wei.com, chenhao288@...ilicon.com
Subject: Re: [RFCv3 PATCH net-next 2/2] net-next: hn3: add tx push support in
 hns3 ring param process

On Tue, Mar 29, 2022 at 05:19:13PM +0800, Jie Wang wrote:
> This patch adds tx push param to hns3 ring param and adapts the set and get
> API of ring params. So users can set it by cmd ethtool -G and get it by cmd
> ethtool -g.
> 
> Signed-off-by: Jie Wang <wangjie125@...wei.com>
> ---
>  .../ethernet/hisilicon/hns3/hns3_ethtool.c    | 33 ++++++++++++++++++-
>  1 file changed, 32 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
> index 6469238ae090..5bc509f90d2a 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
> @@ -664,6 +664,8 @@ static void hns3_get_ringparam(struct net_device *netdev,
>  	param->tx_pending = priv->ring[0].desc_num;
>  	param->rx_pending = priv->ring[rx_queue_index].desc_num;
>  	kernel_param->rx_buf_len = priv->ring[rx_queue_index].buf_size;
> +	kernel_param->tx_push = test_bit(HNS3_NIC_STATE_TX_PUSH_ENABLE,
> +					 &priv->state);
>  }
>  
>  static void hns3_get_pauseparam(struct net_device *netdev,
> @@ -1114,6 +1116,30 @@ static int hns3_change_rx_buf_len(struct net_device *ndev, u32 rx_buf_len)
>  	return 0;
>  }
>  
> +static int hns3_set_tx_push(struct net_device *netdev, u32 tx_push)
> +{
> +	struct hns3_nic_priv *priv = netdev_priv(netdev);
> +	struct hnae3_handle *h = hns3_get_handle(netdev);
> +	struct hnae3_ae_dev *ae_dev = pci_get_drvdata(h->pdev);
> +	u32 old_state = test_bit(HNS3_NIC_STATE_TX_PUSH_ENABLE, &priv->state);
> +
> +	if (!test_bit(HNAE3_DEV_SUPPORT_TX_PUSH_B, ae_dev->caps) && tx_push)
> +		return -EOPNOTSUPP;
> +
> +	if (tx_push == old_state)
> +		return 0;
> +
> +	netdev_info(netdev, "Changing tx push from %s to %s\n",
> +		    old_state ? "on" : "off", tx_push ? "on" : "off");

A nitpick: do we really want an unconditional log message for each
change? If someone wants to monitor them, that's what the netlink
notifications were created for.

Michal

> +
> +	if (tx_push)
> +		set_bit(HNS3_NIC_STATE_TX_PUSH_ENABLE, &priv->state);
> +	else
> +		clear_bit(HNS3_NIC_STATE_TX_PUSH_ENABLE, &priv->state);
> +
> +	return 0;
> +}
> +
>  static int hns3_set_ringparam(struct net_device *ndev,
>  			      struct ethtool_ringparam *param,
>  			      struct kernel_ethtool_ringparam *kernel_param,

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