IB/mlx5: Add CQE version 1 support to user QPs and SRQs

Enforce working with CQE version 1 when the user supports CQE
version 1 and asked to work this way.

If the user still works with CQE version 0, then use the default
CQE version to tell the Firmware that the user still works in the
older mode.

After this patch, the kernel still reports CQE version 0.

Signed-off-by: Haggai Abramovsky <hagaya@mellanox.com>
Reviewed-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mlx5/mlx5_ib.h

@@ -57,6 +57,8 @@ pr_warn("%s:%s:%d:(pid %d): " format, (dev)->ib_dev.name, __func__,	\
 
 #define field_avail(type, fld, sz) (offsetof(type, fld) +		\
 				    sizeof(((type *)0)->fld) <= (sz))
+#define MLX5_IB_DEFAULT_UIDX 0xffffff
+#define MLX5_USER_ASSIGNED_UIDX_MASK __mlx5_mask(qpc, user_index)
 
 enum {
 	MLX5_IB_MMAP_CMD_SHIFT	= 8,
@@ -94,6 +96,11 @@ enum {
 	MLX5_CROSS_CHANNEL_UUAR         = 0,
 };
 
+enum {
+	MLX5_CQE_VERSION_V0,
+	MLX5_CQE_VERSION_V1,
+};
+
 struct mlx5_ib_ucontext {
 	struct ib_ucontext	ibucontext;
 	struct list_head	db_page_list;
@@ -102,6 +109,7 @@ struct mlx5_ib_ucontext {
 	 */
 	struct mutex		db_page_mutex;
 	struct mlx5_uuar_info	uuari;
+	u8			cqe_version;
 };
 
 static inline struct mlx5_ib_ucontext *to_mucontext(struct ib_ucontext *ibucontext)
@@ -694,4 +702,19 @@ static inline u32 check_cq_create_flags(u32 flags)
 	 */
 	return (flags & ~IB_CQ_FLAGS_IGNORE_OVERRUN);
 }
+
+static inline int verify_assign_uidx(u8 cqe_version, u32 cmd_uidx,
+				     u32 *user_index)
+{
+	if (cqe_version) {
+		if ((cmd_uidx == MLX5_IB_DEFAULT_UIDX) ||
+		    (cmd_uidx & ~MLX5_USER_ASSIGNED_UIDX_MASK))
+			return -EINVAL;
+		*user_index = cmd_uidx;
+	} else {
+		*user_index = MLX5_IB_DEFAULT_UIDX;
+	}
+
+	return 0;
+}
 #endif /* MLX5_IB_H */