linux-kernel - Re: [PATCH] IB/mlx5: Fix outstanding

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Message-ID: <20191218060038.GL66555@unreal>
Date:   Wed, 18 Dec 2019 08:00:38 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Prabhath Sajeepa <psajeepa@...estorage.com>
Cc:     dledford@...hat.com, jgg@...pe.ca, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, roland@...estorage.com
Subject: Re: [PATCH] IB/mlx5: Fix outstanding_pi index for GSI qps

On Thu, Dec 12, 2019 at 05:11:29PM -0700, Prabhath Sajeepa wrote:
> b0ffeb537f3a changed the way how outstanding WRs are tracked for GSI QP. But the
> fix did not cover the case when a call to ib_post_send fails and index
> to track outstanding WRs need to be updated correctly.
>
> Fixes: b0ffeb537f3a ('IB/mlx5: Fix iteration overrun in GSI qps ')
> Signed-off-by: Prabhath Sajeepa <psajeepa@...estorage.com>
> ---
>  drivers/infiniband/hw/mlx5/gsi.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)

The description of this patch is better to be updated to include the
fact that outstanding_ci holds unwrapped version of outstanding_pi and
current code will generate wrong loop inside generate_completions(), due
to breaking assumption that outstanding_ci < outstanding_pi:

 79         for (index = gsi->outstanding_ci; index != gsi->outstanding_pi;
 80              index++) {

Thanks,
Acked-by: Leon Romanovsky <leonro@...lanox.com>