linux-kernel - Re: [PATCH rdma-next] RDMA/rdmavt: Decouple QP and SGE lists allocations

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Message-ID: <YLcKBb3/Oir2Bdm5@unreal>
Date:   Wed, 2 Jun 2021 07:33:09 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>
Cc:     Jason Gunthorpe <jgg@...dia.com>,
        "Marciniszyn, Mike" <mike.marciniszyn@...nelisnetworks.com>,
        Doug Ledford <dledford@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: Re: [PATCH rdma-next] RDMA/rdmavt: Decouple QP and SGE lists
 allocations

On Tue, May 25, 2021 at 10:10:47AM -0400, Dennis Dalessandro wrote:
> On 5/25/21 9:13 AM, Jason Gunthorpe wrote:
> > On Thu, May 20, 2021 at 06:02:09PM -0400, Dennis Dalessandro wrote:

<...>

> We are already mid 5.13 cycle. So the earliest this could be queued up to go
> in is 5.14. Can this wait one more cycle? If we can't get it tested/proven
> to make a difference mid 5.14, we will drop the objection and Leon's patch
> can go ahead in for 5.15. Fair compromise?

I sent this patch as early as I could to make sure that it won't
jeopardize the restrack QP flow fixes. Delaying one more cycle means
that QP conversion will be delayed too which is needed to close the race
between netlink query QP call and simultaneous ibv_destroy_qp() call.

Thanks

> 
> -Denny
> 
> 
> 
>