net/mlx5: Add MPCNT register infrastructure

Add the needed infrastructure for future use of MPCNT register.

Signed-off-by: Gal Pressman <galp@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
diff --git a/include/linux/mlx5/device.h b/include/linux/mlx5/device.h
index 5ad1d3c..1cf97dc 100644
--- a/include/linux/mlx5/device.h
+++ b/include/linux/mlx5/device.h
@@ -1119,6 +1119,10 @@ enum {
 	MLX5_INFINIBAND_PORT_COUNTERS_GROUP   = 0x20,
 };
 
+enum {
+	MLX5_PCIE_PERFORMANCE_COUNTERS_GROUP       = 0x0,
+};
+
 static inline u16 mlx5_to_sw_pkey_sz(int pkey_sz)
 {
 	if (pkey_sz > MLX5_MAX_LOG_PKEY_TABLE)