netdev - Re: [PATCH RFC 12/12] RDMA/hns: Support fast path for link-down events dispatching

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Message-ID: <20241224102758.GE171473@unreal>
Date: Tue, 24 Dec 2024 12:27:58 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Junxian Huang <huangjunxian6@...ilicon.com>
Cc: jgg@...pe.ca, selvin.xavier@...adcom.com, chengyou@...ux.alibaba.com,
	kaishen@...ux.alibaba.com, mustafa.ismail@...el.com,
	tatyana.e.nikolova@...el.com, yishaih@...dia.com, benve@...co.com,
	neescoba@...co.com, bryan-bt.tan@...adcom.com,
	vishnu.dasa@...adcom.com, zyjzyj2000@...il.com, bmt@...ich.ibm.com,
	linux-rdma@...r.kernel.org, linuxarm@...wei.com,
	linux-kernel@...r.kernel.org, tangchengchang@...wei.com,
	liyuyu6@...wei.com, linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH RFC 12/12] RDMA/hns: Support fast path for link-down
 events dispatching

On Fri, Nov 22, 2024 at 06:53:08PM +0800, Junxian Huang wrote:
> From: Yuyu Li <liyuyu6@...wei.com>
> 
> hns3 NIC driver can directly notify the RoCE driver about link status
> events bypassing the netdev notifier. This can provide more timely
> event dispatching for ULPs.

It is unlikely that it matters for ULPs and better would be if you don't
open-code existing netdev functionality (netdev notifiers).

Thanks

> 
> Signed-off-by: Yuyu Li <liyuyu6@...wei.com>
> Signed-off-by: Junxian Huang <huangjunxian6@...ilicon.com>
> ---
>  drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
> index 697b17cca02e..5c911d1def03 100644
> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
> @@ -7178,9 +7178,22 @@ static int hns_roce_hw_v2_reset_notify(struct hnae3_handle *handle,
>  	return ret;
>  }
>  
> +static void hns_roce_hw_v2_link_status_change(struct hnae3_handle *handle,
> +					      bool linkup)
> +{
> +	struct hns_roce_dev *hr_dev = (struct hns_roce_dev *)handle->priv;
> +	struct net_device *netdev = handle->rinfo.netdev;
> +
> +	if (linkup || !hr_dev)
> +		return;
> +
> +	ib_dispatch_port_state_event(&hr_dev->ib_dev, netdev);
> +}
> +
>  static const struct hnae3_client_ops hns_roce_hw_v2_ops = {
>  	.init_instance = hns_roce_hw_v2_init_instance,
>  	.uninit_instance = hns_roce_hw_v2_uninit_instance,
> +	.link_status_change = hns_roce_hw_v2_link_status_change,
>  	.reset_notify = hns_roce_hw_v2_reset_notify,
>  };
>  
> -- 
> 2.33.0
>