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

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Message-ID: <C00EA178-ED20-4D56-B6F2-200AC72F3A39@oracle.com>
Date: Fri, 20 Sep 2024 09:46:06 +0000
From: Haakon Bugge <haakon.bugge@...cle.com>
To: Christoph Hellwig <hch@...radead.org>
CC: 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

Hi Christoph,

> On 19 Sep 2024, at 16:17, Christoph Hellwig <hch@...radead.org> wrote:
> 
> On Wed, Sep 18, 2024 at 10:35:50AM +0200, Håkon Bugge wrote:
>> The Dynamic Interrupt Moderation mechanism can only be used by ULPs
>> using ib_alloc_cq() and family. We extend DIM to also cover legacy
>> ULPs using ib_create_cq(). The last commit takes advantage of this end
>> uses DIM in RDS.
> 
> I would much prefer if you could move RDS off that horrible API finally
> instead of investing more effort into it and making it more complicated.

ib_alloc_cq() and family does not support arming the CQ with the IB_CQ_SOLICITED flag, which RDS uses.


Thxs, Håkon