net/mlx5: Add pci shutdown callback

This patch introduces kexec support for mlx5.
When switching kernels, kexec() calls shutdown, which unloads
the driver and cleans its resources.

In addition, remove unregister netdev from shutdown flow. This will
allow a clean shutdown, even if some netdev clients did not release their
reference from this netdev. Releasing The HW resources only is enough as
the kernel is shutting down

Signed-off-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Haggai Abramovsky <hagaya@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index dcd5ac8d3b14..369c837d40f5 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -519,8 +519,9 @@ enum mlx5_device_state {
 };
 
 enum mlx5_interface_state {
-        MLX5_INTERFACE_STATE_DOWN,
-        MLX5_INTERFACE_STATE_UP,
+        MLX5_INTERFACE_STATE_DOWN = BIT(0),
+        MLX5_INTERFACE_STATE_UP = BIT(1),
+        MLX5_INTERFACE_STATE_SHUTDOWN = BIT(2),
 };
 
 enum mlx5_pci_status {
@@ -544,7 +545,7 @@ struct mlx5_core_dev {
         enum mlx5_device_state  state;
         /* sync interface state */
         struct mutex            intf_state_mutex;
-        enum mlx5_interface_state interface_state;
+        unsigned long           intf_state;
         void                    (*event) (struct mlx5_core_dev *dev,
                                           enum mlx5_dev_event event,
                                           unsigned long param);