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

Junxian Huang
2024-07-08T02:29:57Z

On 2024/7/7 16:30, Leon Romanovsky wrote:
> 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?
>

It's set when the device is being initialized, and won't be changed after that.

Junxian

>> + 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
>>