Re: [PATCH for-rc 2/9] RDMA/hns: Fix a long wait for cmdq event during reset

[Leon Romanovsky <leon@kernel.org>]

On Fri, Jul 05, 2024 at 04:59:30PM +0800, Junxian Huang wrote:
> From: wenglianfa <wenglianfa@huawei.com>
> 
> During reset, cmdq events won't be reported, leading to a long and
> unnecessary wait. Notify all the cmdqs to stop waiting at the beginning
> of reset.
> 
> Fixes: 9a4435375cd1 ("IB/hns: Add driver files for hns RoCE driver")
> Signed-off-by: wenglianfa <wenglianfa@huawei.com>
> Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
> ---
>  drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
> index a5d746a5cc68..ff135df1a761 100644
> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
> @@ -6977,6 +6977,21 @@ static void hns_roce_hw_v2_uninit_instance(struct hnae3_handle *handle,
>  
>  	handle->rinfo.instance_state = HNS_ROCE_STATE_NON_INIT;
>  }
> +
> +static void hns_roce_v2_reset_notify_cmd(struct hns_roce_dev *hr_dev)
> +{
> +	struct hns_roce_cmdq *hr_cmd = &hr_dev->cmd;
> +	int i;
> +
> +	if (!hr_dev->cmd_mod)

What prevents cmd_mod from being changed?

> +		return;
> +
> +	for (i = 0; i < hr_cmd->max_cmds; i++) {
> +		hr_cmd->context[i].result = -EBUSY;
> +		complete(&hr_cmd->context[i].done);
> +	}
> +}
> +
>  static int hns_roce_hw_v2_reset_notify_down(struct hnae3_handle *handle)
>  {
>  	struct hns_roce_dev *hr_dev;
> @@ -6997,6 +7012,9 @@ static int hns_roce_hw_v2_reset_notify_down(struct hnae3_handle *handle)
>  	hr_dev->dis_db = true;
>  	hr_dev->state = HNS_ROCE_DEVICE_STATE_RST_DOWN;
>  
> +	/* Complete the CMDQ event in advance during the reset. */
> +	hns_roce_v2_reset_notify_cmd(hr_dev);
> +
>  	return 0;
>  }
>  
> -- 
> 2.33.0
>