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

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Date:   Sun, 15 Jul 2018 14:48:44 -0500
From:   Daniel Jurgens <danielj@...lanox.com>
To:     Or Gerlitz <gerlitz.or@...il.com>,
        Parav Pandit <parav@...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 7/14/2018 10:57 AM, Or Gerlitz wrote:
> 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?
It's a structure to keep track affiliated port info in dual port RoCE mode, mpi meaning multi-port info. Parav can review this it my absence, otherwise I can take a closer look when I return to the office.
>
> 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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