linux-kernel - Re: [MAINLINE 0/2] Enable DIM for legacy ULPs and use it in RDS

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Message-ID: <5b86861b-60f7-4c90-bc0e-d863b422850f@linux.dev>
Date: Wed, 25 Sep 2024 10:04:21 +0800
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Haakon Bugge <haakon.bugge@...cle.com>
Cc: Christoph Hellwig <hch@...radead.org>, Jason Gunthorpe <jgg@...pe.ca>,
 Leon Romanovsky <leon@...nel.org>,
 Allison Henderson <allison.henderson@...cle.com>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 OFED mailing list <linux-rdma@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 "rds-devel@....oracle.com" <rds-devel@....oracle.com>
Subject: Re: [MAINLINE 0/2] Enable DIM for legacy ULPs and use it in RDS

在 2024/9/24 23:16, Haakon Bugge 写道:
> 
> 
>> On 24 Sep 2024, at 15:59, Zhu Yanjun <yanjun.zhu@...ux.dev> wrote:
>>
>> 在 2024/9/24 14:54, Christoph Hellwig 写道:
>>> On Tue, Sep 24, 2024 at 09:58:24AM +0800, Zhu Yanjun wrote:
>>>> The users that I mentioned is not in the kernel tree.
>>> And why do you think that would matter the slightest?
>>
>> I noticed that the same cq functions are used. And I also made tests with this patch series. Without this patch series, dim mechanism will not be invoked.
> 
> Christoph alluded to say: Do not modify the old cq_create_cq() code in order to support DIM, it is better to change the ULP to use ib_alloc_cq(), and get DIM enabled that way.

Hi, Haakon

To be honest, I like your original commit that enable DIM for legacy 
ULPs because this can fix this problem once for all and improve the old 
ib_create_cq function.

The idea from Christoph will cause a lot of changes in ULPs. I am not 
very sure if these changes cause risks or not.

Thus, I prefer to your original commit. But I will follow the advice 
from Leon and Jason.

Zhu Yanjun

> 
> 
> Thxs, Håkon
>