mlx4: Handle memory region deregistration failure

Memory region deregistration can fail when memory windows
are bound to it. We handle such failures by propagating them
to the user, or by printing a serious warning.

Signed-off-by: Haggai Eran <[email protected]>
Signed-off-by: Shani Michaeli <[email protected]>
(Ported from Mellanox OFED 2.4)

Signed-off-by: Mukesh Kacker <[email protected]>

Orabug: 27510464

(cherry picked from commit 872599a)
cherry-pick-repo=linux-uek.git

This is a partial port of the cherry-picked commit:

  Changes to drivers/infiniband/core/uverbs_main.c are no longer needed
  because upstream commits fd3c790 and 43579b5 have introduced new
  implementation for this code section.

Conflicts:
    drivers/infiniband/core/uverbs_main.c

Signed-off-by: Qing Huang <[email protected]>
Reviewed-by: Yuval Shaia <[email protected]>
Signed-off-by: Aron Silverton <[email protected]>
Signed-off-by: Somasundaram Krishnasamy <[email protected]>

Orabug: 31620961

UEK5 => UEK6

(cherry picked from commit c113cd0)
cherry-pick-repo=UEK/production/linux-uek.git
unmodified-from-upstream: c113cd0

Signed-off-by: Qing Huang <[email protected]>
Reviewed-by: Sharath Srinivasan <[email protected]>
Signed-off-by: Aron Silverton <[email protected]>

Orabug: 31620963

UEK6 => LUCI

(cherry picked from commit 3fecb9e)
cherry-pick-repo=UEK/production/linux-uek.git

Conflicts:
	drivers/net/ethernet/mellanox/mlx4/mr.c

Only include changes to en_main.c and ignore changes to mr.c since FMR
support was removed by upstream commit:

1f55b7a ("RDMA/mlx4: Remove FMR support for memory registration")

Signed-off-by: Sharath Srinivasan <[email protected]>
Reviewed-by: Qing Huang <[email protected]>
Signed-off-by: Aron Silverton <[email protected]

Author: Shani Michaeli

drivers/net/ethernet/mellanox/mlx4/en_main.c

@@ -227,7 +227,11 @@ static void mlx4_en_event(struct mlx4_dev *dev, void *endev_ptr,
 static void mlx4_en_remove(struct mlx4_dev *dev, void *endev_ptr)
 {
 	struct mlx4_en_dev *mdev = endev_ptr;
+#ifdef WITHOUT_ORACLE_EXTENSIONS
 	int i;
+#else
+	int i, ret;
+#endif /* WITHOUT_ORACLE_EXTENSIONS */
 
 	mutex_lock(&mdev->state_lock);
 	mdev->device_up = false;
@@ -239,7 +243,13 @@ static void mlx4_en_remove(struct mlx4_dev *dev, void *endev_ptr)
 
 	flush_workqueue(mdev->workqueue);
 	destroy_workqueue(mdev->workqueue);
+#ifdef WITHOUT_ORACLE_EXTENSIONS
 	(void) mlx4_mr_free(dev, &mdev->mr);
+#else
+	ret = mlx4_mr_free(dev, &mdev->mr);
+	if (ret)
+		mlx4_err(mdev, "Error deregistering MR. The system may have become unstable.");
+#endif /* WITHOUT_ORACLE_EXTENSIONS */
 	iounmap(mdev->uar_map);
 	mlx4_uar_free(dev, &mdev->priv_uar);
 	mlx4_pd_free(dev, mdev->priv_pdn);
@@ -337,7 +347,12 @@ static void *mlx4_en_add(struct mlx4_dev *dev)
 	return mdev;
 
 err_mr:
+#ifdef WITHOUT_ORACLE_EXTENSIONS
 	(void) mlx4_mr_free(dev, &mdev->mr);
+#else
+	if (mlx4_mr_free(dev, &mdev->mr))
+		mlx4_err(mdev, "Error deregistering MR. The system may have become unstable.");
+#endif /* WITHOUT_ORACLE_EXTENSIONS */
 err_map:
 	if (mdev->uar_map)
 		iounmap(mdev->uar_map);