1 files changed, 97 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mlx5/umr.h b/drivers/infiniband/hw/mlx5/umr.h
new file mode 100644
index 000000000000..c9d0021381a2
--- /dev/null
+++ b/drivers/infiniband/hw/mlx5/umr.h
@@ -0,0 +1,97 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. */
+
+#ifndef _MLX5_IB_UMR_H
+#define _MLX5_IB_UMR_H
+
+#include "mlx5_ib.h"
+
+
+#define MLX5_MAX_UMR_SHIFT 16
+#define MLX5_MAX_UMR_PAGES (1 << MLX5_MAX_UMR_SHIFT)
+
+#define MLX5_IB_UMR_OCTOWORD	       16
+#define MLX5_IB_UMR_XLT_ALIGNMENT      64
+
+int mlx5r_umr_resource_init(struct mlx5_ib_dev *dev);
+void mlx5r_umr_resource_cleanup(struct mlx5_ib_dev *dev);
+
+static inline bool mlx5r_umr_can_load_pas(struct mlx5_ib_dev *dev,
+					  size_t length)
+{
+	/*
+	 * umr_check_mkey_mask() rejects MLX5_MKEY_MASK_PAGE_SIZE which is
+	 * always set if MLX5_IB_SEND_UMR_UPDATE_TRANSLATION (aka
+	 * MLX5_IB_UPD_XLT_ADDR and MLX5_IB_UPD_XLT_ENABLE) is set. Thus, a mkey
+	 * can never be enabled without this capability. Simplify this weird
+	 * quirky hardware by just saying it can't use PAS lists with UMR at
+	 * all.
+	 */
+	if (MLX5_CAP_GEN(dev->mdev, umr_modify_entity_size_disabled))
+		return false;
+
+	/*
+	 * length is the size of the MR in bytes when mlx5_ib_update_xlt() is
+	 * used.
+	 */
+	if (!MLX5_CAP_GEN(dev->mdev, umr_extended_translation_offset) &&
+	    length >= MLX5_MAX_UMR_PAGES * PAGE_SIZE)
+		return false;
+	return true;
+}
+
+/*
+ * true if an existing MR can be reconfigured to new access_flags using UMR.
+ * Older HW cannot use UMR to update certain elements of the MKC. See
+ * get_umr_update_access_mask() and umr_check_mkey_mask()
+ */
+static inline bool mlx5r_umr_can_reconfig(struct mlx5_ib_dev *dev,
+					  unsigned int current_access_flags,
+					  unsigned int target_access_flags)
+{
+	unsigned int diffs = current_access_flags ^ target_access_flags;
+
+	if ((diffs & IB_ACCESS_REMOTE_ATOMIC) &&
+	    MLX5_CAP_GEN(dev->mdev, atomic) &&
+	    MLX5_CAP_GEN(dev->mdev, umr_modify_atomic_disabled))
+		return false;
+
+	if ((diffs & IB_ACCESS_RELAXED_ORDERING) &&
+	    MLX5_CAP_GEN(dev->mdev, relaxed_ordering_write) &&
+	    !MLX5_CAP_GEN(dev->mdev, relaxed_ordering_write_umr))
+		return false;
+
+	if ((diffs & IB_ACCESS_RELAXED_ORDERING) &&
+	    MLX5_CAP_GEN(dev->mdev, relaxed_ordering_read) &&
+	    !MLX5_CAP_GEN(dev->mdev, relaxed_ordering_read_umr))
+		return false;
+
+	return true;
+}
+
+static inline u64 mlx5r_umr_get_xlt_octo(u64 bytes)
+{
+	return ALIGN(bytes, MLX5_IB_UMR_XLT_ALIGNMENT) /
+	       MLX5_IB_UMR_OCTOWORD;
+}
+
+struct mlx5r_umr_context {
+	struct ib_cqe cqe;
+	enum ib_wc_status status;
+	struct completion done;
+};
+
+struct mlx5r_umr_wqe {
+	struct mlx5_wqe_umr_ctrl_seg ctrl_seg;
+	struct mlx5_mkey_seg mkey_seg;
+	struct mlx5_wqe_data_seg data_seg;
+};
+
+int mlx5r_umr_revoke_mr(struct mlx5_ib_mr *mr);
+int mlx5r_umr_rereg_pd_access(struct mlx5_ib_mr *mr, struct ib_pd *pd,
+			      int access_flags);
+int mlx5r_umr_update_mr_pas(struct mlx5_ib_mr *mr, unsigned int flags);
+int mlx5r_umr_update_xlt(struct mlx5_ib_mr *mr, u64 idx, int npages,
+			 int page_shift, int flags);
+
+#endif /* _MLX5_IB_UMR_H */