linux-kernel - Re: [PATCH rdma-next 3/5] RDMA/hns: Increase checking CMQ status timeout value

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Date:   Wed, 23 May 2018 09:23:46 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     "Wei Hu (Xavier)" <xavier.huwei@...wei.com>
Cc:     dledford@...hat.com, jgg@...pe.ca, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, xavier.huwei@....com,
        lijun_nudt@....com
Subject: Re: [PATCH rdma-next 3/5] RDMA/hns: Increase checking CMQ status
 timeout value

On Wed, May 23, 2018 at 02:15:48PM +0800, Wei Hu (Xavier) wrote:
>
>
> On 2018/5/23 14:09, Wei Hu (Xavier) wrote:
> >
> > On 2018/5/23 13:49, Leon Romanovsky wrote:
> >> On Thu, May 17, 2018 at 04:02:51PM +0800, Wei Hu (Xavier) wrote:
> >>> This patch increases checking CMQ status timeout value and
> >>> uses the same value with NIC driver to avoid deficiency of
> >>> time.
> >>>
> >>> Signed-off-by: Wei Hu (Xavier) <xavier.huwei@...wei.com>
> >>> ---
> >>>  drivers/infiniband/hw/hns/hns_roce_hw_v2.h | 2 +-
> >>>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>>
> >>> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.h b/drivers/infiniband/hw/hns/hns_roce_hw_v2.h
> >>> index 182b672..f16df1b 100644
> >>> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.h
> >>> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.h
> >>> @@ -76,7 +76,7 @@
> >>>  #define HNS_ROCE_V2_PAGE_SIZE_SUPPORTED		0xFFFFF000
> >>>  #define HNS_ROCE_V2_MAX_INNER_MTPT_NUM		2
> >>>  #define HNS_ROCE_INVALID_LKEY			0x100
> >>> -#define HNS_ROCE_CMQ_TX_TIMEOUT			200
> >>> +#define HNS_ROCE_CMQ_TX_TIMEOUT			30000
> >> Don't you think that loop of 30 seconds too much?
> >>
> >> Thanks
> > Leon, 30ms
> Because firmware take turns excuting NIC and RoCE command.
> Although RoCE command does not  take so long,  we still use
> the same timeout value with NIC driver.

Sorry, you are right it is 30ms and not 30s.

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...lanox.com>

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