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From:   Niklas Schnelle <schnelle@linux.ibm.com>
To:     Saeed Mahameed <saeedm@mellanox.com>
Cc:     netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Leon Romanovsky <leon@kernel.org>,
        Niklas Schnelle <schnelle@linux.ibm.com>
Subject: [PATCH 0/1] net/mlx5: Call pci_disable_sriov() on remove
Date:   Thu, 30 Apr 2020 14:03:07 +0200
Message-Id: <20200430120308.92773-1-schnelle@linux.ibm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hello,

I'm currently working on improvements in PF-VF handling on s390. One thing that
may be a bit special for us is that the s390 hotplug code supports shutting
down a single PF of a multi-function device such as a ConnectX-5.
During testing I found that the mlx5_core driver does not call
pci_disable_sriov() in its remove handler which is called on the PF via
pci_stop_and_remove_bus_device() on an orderly hot unplug.

Following is a patch to fix this, I want to point out however that I'm not
entirely sure about the effect of clear_vfs that distinguishes
mlx5_sriov_detach() from mlx5_sriov_disable() only that the former is called
from the remove handler and it doesn't call pci_disable_sriov().
That however is required according to Documentation/PCI/pci-iov-howto.rst

I've only tested this on top of my currently still internal PF-VF rework so
I might also be totally missing something here in that case excuse my
ignorance.

Best regards,
Niklas Schnelle

Niklas Schnelle (1):
  net/mlx5: Call pci_disable_sriov() on remove

 drivers/net/ethernet/mellanox/mlx5/core/sriov.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

-- 
2.17.1