linux-kernel - Re: [PATCH] RDMA/core: Set sgtable nents when using ib_dma_virt_map

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Message-ID: <20211013194500.GA3494942@nvidia.com>
Date:   Wed, 13 Oct 2021 16:45:00 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Doug Ledford <dledford@...hat.com>,
        Bart Van Assche <bvanassche@....org>
Subject: Re: [PATCH] RDMA/core: Set sgtable nents when using
 ib_dma_virt_map_sg()

On Wed, Oct 13, 2021 at 10:59:42AM -0600, Logan Gunthorpe wrote:
> ib_dma_map_sgtable_attrs() should be mapping the sgls and setting nents
> but the ib_uses_virt_dma() path falls back to ib_dma_virt_map_sg()
> which will not set the nents in the sgtable.
> 
> Check the return value (per the map_sg calling convention) and set
> sgt->nents appropriately on success.
> 
> Link: https://lore.kernel.org/all/996fa723-18ef-d35b-c565-c9cb9dc2d5e1@acm.org/T/#u
> Reported-by: Bart Van Assche <bvanassche@....org>
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
> Tested-by: Bart Van Assche <bvanassche@....org>
> ---
>  include/rdma/ib_verbs.h | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)

Applied to for-next, thanks

Jason