linux-kernel - Re: [PATCH v10 08/22] IB/hns: Add icm support

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Date:	Tue, 21 Jun 2016 14:55:54 +0300
From:	Leon Romanovsky <leon@...nel.org>
To:	"Wei Hu (Xavier)" <xavier.huwei@...wei.com>
Cc:	Lijun Ou <oulijun@...wei.com>, dledford@...hat.com,
	sean.hefty@...el.com, hal.rosenstock@...il.com,
	davem@...emloft.net, jeffrey.t.kirsher@...el.com,
	jiri@...lanox.com, ogerlitz@...lanox.com,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, gongyangming@...wei.com,
	xiaokun@...wei.com, tangchaofei@...wei.com, haifeng.wei@...wei.com,
	yisen.zhuang@...wei.com, yankejian@...wei.com,
	charles.chenxin@...wei.com, linuxarm@...wei.com
Subject: Re: [PATCH v10 08/22] IB/hns: Add icm support

On Tue, Jun 21, 2016 at 12:37:39PM +0800, Wei Hu (Xavier) wrote:
> 
> 
> On 2016/6/20 21:04, Leon Romanovsky wrote:
> >On Mon, Jun 20, 2016 at 05:48:15PM +0800, Wei Hu (Xavier) wrote:
> >>
> >>On 2016/6/20 17:27, Leon Romanovsky wrote:
> >>>On Mon, Jun 20, 2016 at 03:49:24PM +0800, Wei Hu (Xavier) wrote:
> >>>>On 2016/6/20 14:06, Leon Romanovsky wrote:
> >>>>>On Mon, Jun 20, 2016 at 12:37:40PM +0800, Wei Hu (Xavier) wrote:
> >>>>>>On 2016/6/17 17:58, Leon Romanovsky wrote:
> >>>>>>>On Thu, Jun 16, 2016 at 10:35:16PM +0800, Lijun Ou wrote:
> >>>>>>>>This patch mainly added icm support for RoCE. It initializes icm
> >>>>>>>>which managers the relative memory blocks for RoCE. The data
> >>>>>>>>structures of RoCE will be located in it. For example, CQ table,
> >>>>>>>>QP table and MTPT table so on.
> >>>>>>>>
> >>>>>>>>Signed-off-by: Wei Hu <xavier.huwei@...wei.com>
> >>>>>>>>Signed-off-by: Nenglong Zhao <zhaonenglong@...ilicon.com>
> >>>>>>>>Signed-off-by: Lijun Ou <oulijun@...wei.com>
> >>>>>>>>---
> >>>>>>><...>
> >>>>>>>
> >>>>>>>>+
> >>>>>Another question which you didn't answer [1].
> >>>>>
> >>>>>"I wonder if you have the same needs for ICM as it is in mlx4 device.
> >>>>>Do you have firmware?"
> >>>>>
> >>>>>[1] http://marc.info/?l=linux-rdma&m=146545553104913&w=2
> >>>>Hi, Leon
> >>>>     Now we haven't firmware.
> >>>>     But hardware still need memory for QPC\CQC\MTPT\mtt etc.
> >>>ICM stands for InfiniHost (Interconnect) Context Memory is a specific
> >>>memory place to share between host <-> FW and host <-> HW if HW is
> >>>aware of specific structures.
> >>>
> >>>I assume that in your case, it is enough to allocate memory region and
> >>>supply it to HW. Am I right?
> >>For Our hardware,
> >>1. ICM has a memory management method, It's very good for QPC\CQC\MTPT\mtt
> >>etc. we need it.
> >You need special HW to leverage its. AFAIK it is Mellanox specific.
> For our hardware, we use ICM to memory management, the memory shared with
> host and HW.
> QPC\CQC\MTPT\mtt has specific memory requirement.
> QPC\CQC\MTPT need continuous memory. we use ICM to management the block of
> memory. It's very good！

I wasn't convinced why do you need to copy whole ICM logic which is
specific to Mellanox. Your requirements can be implemented by standard CMA
and/or DMA.

> >>2. The meomry for QPC\CQC\MTPT\mtt only used for RoCE hardware and driver,
> >>we don't want use MR.
> >I didn't mean Infiniband MR, but memory region returned from standard
> >allocation functions (kmalloc, ...).
> >
> >>3. Now we haven't firmware, maybe we need it next version.
> >You are always invited to add support once it will be needed, no need to
> >add it in advance.
> >
> >Thanks
> 
> 

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