linux-kernel - RE: [PATCH for-next 20/20] IB/hns: Delete the redundant lines in hns_roce_v1_m

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Date:   Tue, 20 Sep 2016 16:57:52 +0000
From:   Salil Mehta <salil.mehta@...wei.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     "dledford@...hat.com" <dledford@...hat.com>,
        "Huwei (Xavier)" <xavier.huwei@...wei.com>,
        oulijun <oulijun@...wei.com>,
        "Zhuangyuzeng (Yisen)" <yisen.zhuang@...wei.com>,
        "xuwei (O)" <xuwei5@...ilicon.com>,
        "mehta.salil.lnk@...il.com" <mehta.salil.lnk@...il.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>
Subject: RE: [PATCH for-next 20/20] IB/hns: Delete the redundant lines in
 hns_roce_v1_m_qp()

> -----Original Message-----
> From: linux-rdma-owner@...r.kernel.org [mailto:linux-rdma-
> owner@...r.kernel.org] On Behalf Of Leon Romanovsky
> Sent: Thursday, September 15, 2016 11:15 AM
> To: Salil Mehta
> Cc: dledford@...hat.com; Huwei (Xavier); oulijun; Zhuangyuzeng (Yisen);
> xuwei (O); mehta.salil.lnk@...il.com; linux-rdma@...r.kernel.org;
> linux-kernel@...r.kernel.org; Linuxarm
> Subject: Re: [PATCH for-next 20/20] IB/hns: Delete the redundant lines
> in hns_roce_v1_m_qp()
> 
> On Fri, Sep 09, 2016 at 06:30:51PM +0800, Salil Mehta wrote:
> > From: Lijun Ou <oulijun@...wei.com>
> >
> > It doesn't need to assign for the filed of qp state in qpc separately
> > when qp happen to migrate state which supported in RoCE engine v1.
> >
> > Signed-off-by: Lijun Ou <oulijun@...wei.com>
> > Reviewed-by:  Wei Hu (Xavier) <xavier.huwei@...wei.com>
> > Signed-off-by: Salil Mehta <salil.mehta@...wei.com>
> > ---
> >  drivers/infiniband/hw/hns/hns_roce_hw_v1.c |   14 +++-----------
> >  1 file changed, 3 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> > index 7a61d7e..3bc32fc 100644
> > --- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> > +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> > @@ -2405,11 +2405,6 @@ static int hns_roce_v1_m_qp(struct ib_qp
> *ibqp, const struct ib_qp_attr *attr,
> >  		roce_set_bit(context->qpc_bytes_140,
> >  			     QP_CONTEXT_QPC_BYTES_140_RNR_RETRY_FLG_S, 0);
> >
> > -		roce_set_field(context->qpc_bytes_144,
> > -			       QP_CONTEXT_QPC_BYTES_144_QP_STATE_M,
> > -			       QP_CONTEXT_QPC_BYTES_144_QP_STATE_S,
> > -			       attr->qp_state);
> > -
> >  		roce_set_field(context->qpc_bytes_148,
> >  			       QP_CONTEXT_QPC_BYTES_148_CHECK_FLAG_M,
> >  			       QP_CONTEXT_QPC_BYTES_148_CHECK_FLAG_S, 0);
> > @@ -2524,13 +2519,10 @@ static int hns_roce_v1_m_qp(struct ib_qp
> *ibqp, const struct ib_qp_attr *attr,
> >  		   (cur_state == IB_QPS_RTS && new_state == IB_QPS_ERR) ||
> >  		   (cur_state == IB_QPS_ERR && new_state == IB_QPS_RESET)
> ||
> >  		   (cur_state == IB_QPS_ERR && new_state == IB_QPS_ERR)) {
> > -		roce_set_field(context->qpc_bytes_144,
> > -			       QP_CONTEXT_QPC_BYTES_144_QP_STATE_M,
> > -			       QP_CONTEXT_QPC_BYTES_144_QP_STATE_S,
> > -			       attr->qp_state);
> > -
> > +		/* It will not do additional options in engine v1 */
> > +		;
> 
> It will leave empty if() {..}, it is worth to rewrite to have one if
> for
> error path only.
Agreed & changed in patch v2!

Thanks
Salil
> 
> >  	} else {
> > -		dev_err(dev, "not support this modify\n");
> > +		dev_err(dev, "not support this status migration\n");
> >  		goto out;
> >  	}
> >
> > --
> > 1.7.9.5
> >
> > --
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