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

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Date:   Mon, 12 Sep 2016 15:36:23 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Salil Mehta <salil.mehta@...wei.com>
Cc:     dledford@...hat.com, xavier.huwei@...wei.com, oulijun@...wei.com,
        yisen.zhuang@...wei.com, mehta.salil.lnk@...il.com,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxarm@...wei.com
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.

> +
>  	/* 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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