linux-kernel - RE: [PATCH for-next 03/10] IB/hns: Add & initialize "node

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Date:   Mon, 12 Sep 2016 15:50:59 +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>,
        "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 03/10] IB/hns: Add & initialize "node_guid"
 parameter for RDMA CM



> -----Original Message-----
> From: Leon Romanovsky [mailto:leon@...nel.org]
> Sent: Monday, September 12, 2016 1:36 PM
> To: Salil Mehta
> Cc: dledford@...hat.com; Huwei (Xavier); oulijun; Zhuangyuzeng (Yisen);
> mehta.salil.lnk@...il.com; linux-rdma@...r.kernel.org; linux-
> kernel@...r.kernel.org; Linuxarm
> Subject: Re: [PATCH for-next 03/10] IB/hns: Add & initialize
> "node_guid" parameter for RDMA CM
> 
> On Fri, Sep 02, 2016 at 05:37:18AM +0800, Salil Mehta wrote:
> > From: Lijun Ou <oulijun@...wei.com>
> >
> > According to the Infiniband spec, NodeGUID uniquely identifies a
> > node. This must be initialized to some unique value. This patch
> > adds the support to the HNS RoCE driver to fetch the NodeGUID
> > value from DT or ACPI and then use this value to initialize the
> > node_guid parameter of IB device. This value shall be used by
> > RDMA CM.
> >
> > Signed-off-by: Lijun Ou <oulijun@...wei.com>
> > Reviewed-by: Wei Hu <xavier.huwei@...wei.com>
> > Signed-off-by: Salil Mehta <salil.mehta@...wei.com>
> > ---
> >  drivers/infiniband/hw/hns/hns_roce_device.h |    1 +
> >  drivers/infiniband/hw/hns/hns_roce_main.c   |    7 +++++++
> >  2 files changed, 8 insertions(+)
> >
> > diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h
> b/drivers/infiniband/hw/hns/hns_roce_device.h
> > index ea73580..e943b98 100644
> > --- a/drivers/infiniband/hw/hns/hns_roce_device.h
> > +++ b/drivers/infiniband/hw/hns/hns_roce_device.h
> > @@ -74,6 +74,7 @@
> >  #define MR_TYPE_DMA				0x03
> >
> >  #define PKEY_ID					0xffff
> > +#define GUID_LEN				8
> >  #define NODE_DESC_SIZE				64
> >
> >  #define SERV_TYPE_RC				0
> > diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c
> b/drivers/infiniband/hw/hns/hns_roce_main.c
> > index 4e93120..ec27f0c 100644
> > --- a/drivers/infiniband/hw/hns/hns_roce_main.c
> > +++ b/drivers/infiniband/hw/hns/hns_roce_main.c
> > @@ -812,6 +812,13 @@ static int hns_roce_get_cfg(struct hns_roce_dev
> *hr_dev)
> >  	if (IS_ERR(hr_dev->reg_base))
> >  		return PTR_ERR(hr_dev->reg_base);
> >
> > +	/* read the node_guid of IB device from the DT or ACPI */
> > +	ret = device_property_read_u8_array(dev, "node-guid",
> > +					    (u8 *)&hr_dev->ib_dev.node_guid,
> > +					    GUID_LEN);
> > +	if (ret)
> > +		dev_err(dev, "couldn't get node_guid from DT or ACPI!\n");
> 
> Is it error? If yes, you need to implement proper error folding. If
> not,
> this error shouldn't be error.
Yes, that's correct. This is a merge error. Thanks for catching this.
Above statement should have been like below:

/* read the node_guid of IB device from the DT or ACPI */
	ret = device_property_read_u8_array(dev, "node-guid",
					    (u8 *)&hr_dev->ib_dev.node_guid,
					    GUID_LEN);
	if (ret) {
		dev_err(dev, "couldn't get node_guid from DT or ACPI!\n");
		return ret;
      }

Will fix this. Thanks!

Best regards
Salil Mehta
> 
> > +
> >  	/* get the RoCE associated ethernet ports or netdevices */
> >  	for (i = 0; i < HNS_ROCE_MAX_PORTS; i++) {
> >  		if (dev_of_node(dev)) {
> > --
> > 1.7.9.5
> >
> > --
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