linux-kernel - Re: [PATCH] IB/mlx5: avoid binding a new mpi unit to the same devices repeatedly

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Date:   Sat, 14 Jul 2018 18:57:01 +0300
From:   Or Gerlitz <gerlitz.or@...il.com>
To:     Daniel Jurgens <danielj@...lanox.com>
Cc:     Linux Kernel <linux-kernel@...r.kernel.org>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Doug Ledford <dledford@...hat.com>,
        Leon Romanovsky <leon@...nel.org>, gerald.gibson@...cle.com,
        Qing Huang <qing.huang@...cle.com>
Subject: Re: [PATCH] IB/mlx5: avoid binding a new mpi unit to the same devices repeatedly

On Sat, Jul 14, 2018 at 2:50 AM, Qing Huang <qing.huang@...cle.com> wrote:
> When a CX5 device is configured in dual-port RoCE mode, after creating
> many VFs against port 1, creating the same number of VFs against port 2
> will flood kernel/syslog with something like
> "mlx5_*:mlx5_ib_bind_slave_port:4266:(pid 5269): port 2 already
> affiliated."
>
> So basically, when traversing mlx5_ib_dev_list, mlx5_ib_add_slave_port()
> shouldn't repeatedly attempt to bind the new mpi data unit to every device
> on the list until it finds an unbound device.

Daniel,

What is mpi data unit?

Or.

>
> Reported-by: Gerald Gibson <gerald.gibson@...cle.com>
> Signed-off-by: Qing Huang <qing.huang@...cle.com>
> ---
>  drivers/infiniband/hw/mlx5/main.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
> index b3ba9a2..1ddd1d3 100644
> --- a/drivers/infiniband/hw/mlx5/main.c
> +++ b/drivers/infiniband/hw/mlx5/main.c
> @@ -6068,7 +6068,8 @@ static void *mlx5_ib_add_slave_port(struct mlx5_core_dev *mdev, u8 port_num)
>
>         mutex_lock(&mlx5_ib_multiport_mutex);
>         list_for_each_entry(dev, &mlx5_ib_dev_list, ib_dev_list) {
> -               if (dev->sys_image_guid == mpi->sys_image_guid)
> +               if (dev->sys_image_guid == mpi->sys_image_guid &&
> +                   !dev->port[mlx5_core_native_port_num(mdev) - 1].mp.mpi)
>                         bound = mlx5_ib_bind_slave_port(dev, mpi);
>
>                 if (bound) {
> --
> 2.9.3
>
> --
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