net/mlx5e: Fix return status when setting unsupported FEC mode

Verify the configured FEC mode is supported by at least a single link
mode before applying the command. Otherwise fail the command and return
"Operation not supported".
Prior to this patch, the command was successful, yet it falsely set all
link modes to FEC auto mode - like configuring FEC mode to auto. Auto
mode is the default configuration if a link mode doesn't support the
configured FEC mode.

Fixes: b5ede32d3329 ("net/mlx5e: Add support for FEC modes based on 50G per lane links")
Signed-off-by: Aya Levin <ayal@mellanox.com>
Reviewed-by: Eran Ben Elisha <eranbe@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/port.c b/drivers/net/ethernet/mellanox/mlx5/core/en/port.c
index 96608dbb9314b125d63bd6e4a9dcc10df30c3684..308fd279669ece9861cf7cf0c0f1fe4cb4310fd4 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/port.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/port.c
@@ -569,6 +569,9 @@ int mlx5e_set_fec_mode(struct mlx5_core_dev *dev, u16 fec_policy)
        if (fec_policy >= (1 << MLX5E_FEC_LLRS_272_257_1) && !fec_50g_per_lane)
                return -EOPNOTSUPP;
 
+       if (fec_policy && !mlx5e_fec_in_caps(dev, fec_policy))
+               return -EOPNOTSUPP;
+
        MLX5_SET(pplm_reg, in, local_port, 1);
        err = mlx5_core_access_reg(dev, in, sz, out, sz, MLX5_REG_PPLM, 0, 0);
        if (err)