linux-kernel - Re: [PATCH v5 09/21] IB/hns: Add hca support

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Message-ID: <CAJ3xEMj5KMcdEmpD5YYAMPJYmDW-X1J2nU0OjfJ1V93VKJ+A+A@mail.gmail.com>
Date:	Tue, 3 May 2016 11:14:08 +0300
From:	Or Gerlitz <gerlitz.or@...il.com>
To:	"Wei Hu (Xavier)" <xavier.huwei@...wei.com>
Cc:	oulijun <oulijun@...wei.com>, Jiri Pirko <jiri@...nulli.us>,
	Doug Ledford <dledford@...hat.com>,
	"Hefty, Sean" <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	David Miller <davem@...emloft.net>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jiri Pirko <jiri@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>, linuxarm@...wei.com,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Netdev List <netdev@...r.kernel.org>,
	gongyangming@...wei.com, xiaokun@...wei.com,
	tangchaofei@...wei.com, haifeng.wei@...wei.com,
	yisen.zhuang@...wei.com, yankejian@...wei.com,
	lisheng011@...wei.com, charles.chenxin@...wei.com
Subject: Re: [PATCH v5 09/21] IB/hns: Add hca support

On Tue, May 3, 2016 at 10:57 AM, Wei Hu (Xavier)
<xavier.huwei@...wei.com> wrote:
> On 2016/4/30 12:33, Or Gerlitz wrote:


>> Can you elaborate what design aspects in the driver or anywhere else
>> should impose that limitation?

> 1.  Oulijun resolved the problem, and sent PATCH V6 on 2016-4-28. Thanks for
> more comments.

V6 still conditions things on ARM


> 2.  This driver for Hisilicon RoCE Engine run in ARM SoCs.
> The Hisilicon Network Subsystem is a long term evolution IP which is
> supposed to be used in Hisilicon ICT SoCs. HNS(Hisilicon Network Subsystem)
> has a hardware support of performing RDMA with RoCE engine.

I understand that the HW is targeted just for ARM environments. Is
this the reason
why you want to impose this build limitation or there's something in
the driver design
or code that is not going to work in other environments?

> This Kconfig related with this driver as below:
>
> config INFINIBAND_HISILICON_HNS
>     tristate "Hisilicon Hns ROCE Driver"
>     depends on NET_VENDOR_HISILICON
>     depends on ARM64 && HNS && HNS_DSAF && HNS_ENET

this is understood, my question came to better understand the limitations