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

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Date:   Tue, 11 May 2021 08:26:43 -0400
From:   Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>
To:     Leon Romanovsky <leon@...nel.org>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     Leon Romanovsky <leonro@...dia.com>, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>
Subject: Re: [PATCH rdma-next] RDMA/rdmavt: Decouple QP and SGE lists
 allocations

On 5/11/21 6:36 AM, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...dia.com>
> 
> The rdmavt QP has fields that are both needed for the control and data
> path. Such mixed declaration caused to the very specific allocation flow
> with kzalloc_node and SGE list embedded into the struct rvt_qp.
> 
> This patch separates QP creation to two: regular memory allocation for
> the control path and specific code for the SGE list, while the access to
> the later is performed through derefenced pointer.
> 
> Such pointer and its context are expected to be in the cache, so
> performance difference is expected to be negligible, if any exists.
> 
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> ---
> Hi,
> 
> This change is needed to convert QP to core allocation scheme. In that
> scheme QP is allocated outside of the driver and size of such allocation
> is constant and can be calculated at the compile time.

Thanks Leon, we'll get this put through our testing.

-Denny