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

[Qing Huang]

On 7/15/2018 12:48 PM, Daniel Jurgens wrote:
> On 7/14/2018 10:57 AM, Or Gerlitz wrote:
> > On Sat, Jul 14, 2018 at 2:50 AM, Qing Huang <qing.huang@xxxxxxxxxx> 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.
Hi Daniel/Parav,

Have you got a chance to review this patch? Thanks!

> > Or.
> >
> > > Reported-by: Gerald Gibson <gerald.gibson@xxxxxxxxxx>
> > > Signed-off-by: Qing Huang <qing.huang@xxxxxxxxxx>
> > > ---
> > >   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
> > >
> > > --
> > > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> > > the body of a message to majordomo@xxxxxxxxxxxxxxx
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html