net/mlx4_core: Manage interface state for Reset flow cases

We need to manage interface state to sync between reset flow and some other
relative cases such as remove_one. This has to be done to prevent certain
races. For example in case software stack is down as a result of unload call,
the remove_one should skip the unload phase.

Implement the remove_one case, handling AER and other cases comes next.

The interface can be up/down, upon remove_one, the state will include an extra
bit indicating that the device is cleaned-up, forcing other tasks to finish
before the final cleanup.

Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 7d5d317cb7a6..33f9ca71925c 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -416,6 +416,11 @@ enum {
         MLX4_DEVICE_STATE_INTERNAL_ERROR        = 1 << 1,
 };
 
+enum {
+        MLX4_INTERFACE_STATE_UP         = 1 << 0,
+        MLX4_INTERFACE_STATE_DELETION   = 1 << 1,
+};
+
 #define MSTR_SM_CHANGE_MASK (MLX4_EQ_PORT_INFO_MSTR_SM_SL_CHANGE_MASK | \
                              MLX4_EQ_PORT_INFO_MSTR_SM_LID_CHANGE_MASK)
 
@@ -760,6 +765,8 @@ struct mlx4_dev_persistent {
         struct workqueue_struct *catas_wq;
         struct mutex    device_state_mutex; /* protect HW state */
         u8              state;
+        struct mutex    interface_state_mutex; /* protect SW state */
+        u8      interface_state;
 };
 
 struct mlx4_dev {