mlx4_core: Propagate MR deregistration failures to caller

MR deregistration fails when memory windows are bound to the MR.
Handle such failures by propagating them to the caller ULP.

Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Shani Michaeli <shanim@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

4 files changed, 33 insertions, 15 deletions

diff --git a/drivers/infiniband/hw/mlx4/mr.c b/drivers/infiniband/hw/mlx4/mr.c
index bbaf6176f207..254e1cf26439 100644
--- a/drivers/infiniband/hw/mlx4/mr.c
+++ b/drivers/infiniband/hw/mlx4/mr.c
@@ -68,7 +68,7 @@ struct ib_mr *mlx4_ib_get_dma_mr(struct ib_pd *pd, int acc)
         return &mr->ibmr;
 
 err_mr:
-        mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
+        (void) mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
 
 err_free:
         kfree(mr);
@@ -163,7 +163,7 @@ struct ib_mr *mlx4_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
         return &mr->ibmr;
 
 err_mr:
-        mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
+        (void) mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
 
 err_umem:
         ib_umem_release(mr->umem);
@@ -177,8 +177,11 @@ err_free:
 int mlx4_ib_dereg_mr(struct ib_mr *ibmr)
 {
         struct mlx4_ib_mr *mr = to_mmr(ibmr);
+        int ret;
 
-        mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr);
+        ret = mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr);
+        if (ret)
+                return ret;
         if (mr->umem)
                 ib_umem_release(mr->umem);
         kfree(mr);
@@ -212,7 +215,7 @@ struct ib_mr *mlx4_ib_alloc_fast_reg_mr(struct ib_pd *pd,
         return &mr->ibmr;
 
 err_mr:
-        mlx4_mr_free(dev->dev, &mr->mmr);
+        (void) mlx4_mr_free(dev->dev, &mr->mmr);
 
 err_free:
         kfree(mr);
@@ -291,7 +294,7 @@ struct ib_fmr *mlx4_ib_fmr_alloc(struct ib_pd *pd, int acc,
         return &fmr->ibfmr;
 
 err_mr:
-        mlx4_mr_free(to_mdev(pd->device)->dev, &fmr->mfmr.mr);
+        (void) mlx4_mr_free(to_mdev(pd->device)->dev, &fmr->mfmr.mr);
 
 err_free:
         kfree(fmr);
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_main.c b/drivers/net/ethernet/mellanox/mlx4/en_main.c
index 3a2b8c65642d..a2987142734d 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_main.c
@@ -176,7 +176,7 @@ static void mlx4_en_remove(struct mlx4_dev *dev, void *endev_ptr)
 
         flush_workqueue(mdev->workqueue);
         destroy_workqueue(mdev->workqueue);
-        mlx4_mr_free(dev, &mdev->mr);
+        (void) mlx4_mr_free(dev, &mdev->mr);
         iounmap(mdev->uar_map);
         mlx4_uar_free(dev, &mdev->priv_uar);
         mlx4_pd_free(dev, mdev->priv_pdn);
@@ -283,7 +283,7 @@ static void *mlx4_en_add(struct mlx4_dev *dev)
         return mdev;
 
 err_mr:
-        mlx4_mr_free(dev, &mdev->mr);
+        (void) mlx4_mr_free(dev, &mdev->mr);
 err_map:
         if (!mdev->uar_map)
                 iounmap(mdev->uar_map);
diff --git a/drivers/net/ethernet/mellanox/mlx4/mr.c b/drivers/net/ethernet/mellanox/mlx4/mr.c
index 49705cf860c6..06b16e4ace80 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mr.c
+++ b/drivers/net/ethernet/mellanox/mlx4/mr.c
@@ -442,7 +442,7 @@ int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
 }
 EXPORT_SYMBOL_GPL(mlx4_mr_alloc);
 
-static void mlx4_mr_free_reserved(struct mlx4_dev *dev, struct mlx4_mr *mr)
+static int mlx4_mr_free_reserved(struct mlx4_dev *dev, struct mlx4_mr *mr)
 {
         int err;
 
@@ -450,20 +450,31 @@ static void mlx4_mr_free_reserved(struct mlx4_dev *dev, struct mlx4_mr *mr)
                 err = mlx4_HW2SW_MPT(dev, NULL,
                                      key_to_hw_index(mr->key) &
                                      (dev->caps.num_mpts - 1));
-                if (err)
-                        mlx4_warn(dev, "xxx HW2SW_MPT failed (%d)\n", err);
+                if (err) {
+                        mlx4_warn(dev, "HW2SW_MPT failed (%d),", err);
+                        mlx4_warn(dev, "MR has MWs bound to it.\n");
+                        return err;
+                }
 
                 mr->enabled = MLX4_MPT_EN_SW;
         }
         mlx4_mtt_cleanup(dev, &mr->mtt);
+
+        return 0;
 }
 
-void mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
+int mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
 {
-        mlx4_mr_free_reserved(dev, mr);
+        int ret;
+
+        ret = mlx4_mr_free_reserved(dev, mr);
+        if (ret)
+                return ret;
         if (mr->enabled)
                 mlx4_mpt_free_icm(dev, key_to_hw_index(mr->key));
         mlx4_mpt_release(dev, key_to_hw_index(mr->key));
+
+        return 0;
 }
 EXPORT_SYMBOL_GPL(mlx4_mr_free);
 
@@ -831,7 +842,7 @@ int mlx4_fmr_alloc(struct mlx4_dev *dev, u32 pd, u32 access, int max_pages,
         return 0;
 
 err_free:
-        mlx4_mr_free(dev, &fmr->mr);
+        (void) mlx4_mr_free(dev, &fmr->mr);
         return err;
 }
 EXPORT_SYMBOL_GPL(mlx4_fmr_alloc);
@@ -888,10 +899,14 @@ EXPORT_SYMBOL_GPL(mlx4_fmr_unmap);
 
 int mlx4_fmr_free(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
 {
+        int ret;
+
         if (fmr->maps)
                 return -EBUSY;
 
-        mlx4_mr_free(dev, &fmr->mr);
+        ret = mlx4_mr_free(dev, &fmr->mr);
+        if (ret)
+                return ret;
         fmr->mr.enabled = MLX4_MPT_DISABLED;
 
         return 0;
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 20ea939c22a6..e9fe8caaf8bb 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -801,7 +801,7 @@ u64 mlx4_mtt_addr(struct mlx4_dev *dev, struct mlx4_mtt *mtt);
 
 int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
                   int npages, int page_shift, struct mlx4_mr *mr);
-void mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr);
+int mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr);
 int mlx4_mr_enable(struct mlx4_dev *dev, struct mlx4_mr *mr);
 int mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
                    int start_index, int npages, u64 *page_list);