net/mlx5: Query the maximum MCIA register read size from firmware

[sfrench/cifs-2.6.git] / drivers / net / ethernet / mellanox / mlx5 / core / port.c

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/port.c b/drivers/net/ethernet/mellanox/mlx5/core/port.c
index 289b29a23418337b101898138d311204cc684898..418ab777f6e8aecb93417322c0f97115950fd341 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/port.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/port.c
@@ -365,6 +365,12 @@ static void mlx5_sfp_eeprom_params_set(u16 *i2c_addr, int *page_num, u16 *offset
        *offset -= MLX5_EEPROM_PAGE_LENGTH;
 }
 
+static int mlx5_mcia_max_bytes(struct mlx5_core_dev *dev)
+{
+       /* mcia supports either 12 dwords or 32 dwords */
+       return (MLX5_CAP_MCAM_FEATURE(dev, mcia_32dwords) ? 32 : 12) * sizeof(u32);
+}
+
 static int mlx5_query_mcia(struct mlx5_core_dev *dev,
                           struct mlx5_module_eeprom_query_params *params, u8 *data)
 {
@@ -374,7 +380,7 @@ static int mlx5_query_mcia(struct mlx5_core_dev *dev,
        void *ptr;
        u16 size;
 
-       size = min_t(int, params->size, MLX5_EEPROM_MAX_BYTES);
+       size = min_t(int, params->size, mlx5_mcia_max_bytes(dev));
 
        MLX5_SET(mcia_reg, in, l, 0);
        MLX5_SET(mcia_reg, in, size, size);